sound/core/oss/pcm_oss.c

   1 /*
   2  *  Digital Audio (PCM) abstract layer / OSS compatible
   3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  *
  20  */
  21
  22 #if 0
  23 #define PLUGIN_DEBUG
  24 #endif
  25 #if 0
  26 #define OSS_DEBUG
  27 #endif
  28
  29 #include <linux/init.h>
  30 #include <linux/slab.h>
  31 #include <linux/sched/signal.h>
  32 #include <linux/time.h>
  33 #include <linux/vmalloc.h>
  34 #include <linux/module.h>
  35 #include <linux/math64.h>
  36 #include <linux/string.h>
  37 #include <linux/compat.h>
  38 #include <sound/core.h>
  39 #include <sound/minors.h>
  40 #include <sound/pcm.h>
  41 #include <sound/pcm_params.h>
  42 #include "pcm_plugin.h"
  43 #include <sound/info.h>
  44 #include <linux/soundcard.h>
  45 #include <sound/initval.h>
  46 #include <sound/mixer_oss.h>
  47
  48 #define OSS_ALSAEMULVER         _SIOR ('M', 249, int)
  49
  50 static int dsp_map[SNDRV_CARDS];
  51 static int adsp_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
  52 static bool nonblock_open = 1;
  53
  54 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>");
  55 MODULE_DESCRIPTION("PCM OSS emulation for ALSA.");
  56 MODULE_LICENSE("GPL");
  57 module_param_array(dsp_map, int, NULL, 0444);
  58 MODULE_PARM_DESC(dsp_map, "PCM device number assigned to 1st OSS device.");
  59 module_param_array(adsp_map, int, NULL, 0444);
  60 MODULE_PARM_DESC(adsp_map, "PCM device number assigned to 2nd OSS device.");
  61 module_param(nonblock_open, bool, 0644);
  62 MODULE_PARM_DESC(nonblock_open, "Don't block opening busy PCM devices.");
  63 MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_PCM);
  64 MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_PCM1);
  65
  66 static int snd_pcm_oss_get_rate(struct snd_pcm_oss_file *pcm_oss_file);
  67 static int snd_pcm_oss_get_channels(struct snd_pcm_oss_file *pcm_oss_file);
  68 static int snd_pcm_oss_get_format(struct snd_pcm_oss_file *pcm_oss_file);
  69
  70 /*
  71  * helper functions to process hw_params
  72  */
  73 static int snd_interval_refine_min(struct snd_interval *i, unsigned int min, int openmin)
  74 {
  75         int changed = 0;
  76         if (i->min < min) {
  77                 i->min = min;
  78                 i->openmin = openmin;
  79                 changed = 1;
  80         } else if (i->min == min && !i->openmin && openmin) {
  81                 i->openmin = 1;
  82                 changed = 1;
  83         }
  84         if (i->integer) {
  85                 if (i->openmin) {
  86                         i->min++;
  87                         i->openmin = 0;
  88                 }
  89         }
  90         if (snd_interval_checkempty(i)) {
  91                 snd_interval_none(i);
  92                 return -EINVAL;
  93         }
  94         return changed;
  95 }
  96
  97 static int snd_interval_refine_max(struct snd_interval *i, unsigned int max, int openmax)
  98 {
  99         int changed = 0;
 100         if (i->max > max) {
 101                 i->max = max;
 102                 i->openmax = openmax;
 103                 changed = 1;
 104         } else if (i->max == max && !i->openmax && openmax) {
 105                 i->openmax = 1;
 106                 changed = 1;
 107         }
 108         if (i->integer) {
 109                 if (i->openmax) {
 110                         i->max--;
 111                         i->openmax = 0;
 112                 }
 113         }
 114         if (snd_interval_checkempty(i)) {
 115                 snd_interval_none(i);
 116                 return -EINVAL;
 117         }
 118         return changed;
 119 }
 120
 121 static int snd_interval_refine_set(struct snd_interval *i, unsigned int val)
 122 {
 123         struct snd_interval t;
 124         t.empty = 0;
 125         t.min = t.max = val;
 126         t.openmin = t.openmax = 0;
 127         t.integer = 1;
 128         return snd_interval_refine(i, &t);
 129 }
 130
 131 /**
 132  * snd_pcm_hw_param_value_min
 133  * @params: the hw_params instance
 134  * @var: parameter to retrieve
 135  * @dir: pointer to the direction (-1,0,1) or NULL
 136  *
 137  * Return the minimum value for field PAR.
 138  */
 139 static unsigned int
 140 snd_pcm_hw_param_value_min(const struct snd_pcm_hw_params *params,
 141                            snd_pcm_hw_param_t var, int *dir)
 142 {
 143         if (hw_is_mask(var)) {
 144                 if (dir)
 145                         *dir = 0;
 146                 return snd_mask_min(hw_param_mask_c(params, var));
 147         }
 148         if (hw_is_interval(var)) {
 149                 const struct snd_interval *i = hw_param_interval_c(params, var);
 150                 if (dir)
 151                         *dir = i->openmin;
 152                 return snd_interval_min(i);
 153         }
 154         return -EINVAL;
 155 }
 156
 157 /**
 158  * snd_pcm_hw_param_value_max
 159  * @params: the hw_params instance
 160  * @var: parameter to retrieve
 161  * @dir: pointer to the direction (-1,0,1) or NULL
 162  *
 163  * Return the maximum value for field PAR.
 164  */
 165 static unsigned int
 166 snd_pcm_hw_param_value_max(const struct snd_pcm_hw_params *params,
 167                            snd_pcm_hw_param_t var, int *dir)
 168 {
 169         if (hw_is_mask(var)) {
 170                 if (dir)
 171                         *dir = 0;
 172                 return snd_mask_max(hw_param_mask_c(params, var));
 173         }
 174         if (hw_is_interval(var)) {
 175                 const struct snd_interval *i = hw_param_interval_c(params, var);
 176                 if (dir)
 177                         *dir = - (int) i->openmax;
 178                 return snd_interval_max(i);
 179         }
 180         return -EINVAL;
 181 }
 182
 183 static int _snd_pcm_hw_param_mask(struct snd_pcm_hw_params *params,
 184                                   snd_pcm_hw_param_t var,
 185                                   const struct snd_mask *val)
 186 {
 187         int changed;
 188         changed = snd_mask_refine(hw_param_mask(params, var), val);
 189         if (changed > 0) {
 190                 params->cmask |= 1 << var;
 191                 params->rmask |= 1 << var;
 192         }
 193         return changed;
 194 }
 195
 196 static int snd_pcm_hw_param_mask(struct snd_pcm_substream *pcm,
 197                                  struct snd_pcm_hw_params *params,
 198                                  snd_pcm_hw_param_t var,
 199                                  const struct snd_mask *val)
 200 {
 201         int changed = _snd_pcm_hw_param_mask(params, var, val);
 202         if (changed < 0)
 203                 return changed;
 204         if (params->rmask) {
 205                 int err = snd_pcm_hw_refine(pcm, params);
 206                 if (err < 0)
 207                         return err;
 208         }
 209         return 0;
 210 }
 211
 212 static int _snd_pcm_hw_param_min(struct snd_pcm_hw_params *params,
 213                                  snd_pcm_hw_param_t var, unsigned int val,
 214                                  int dir)
 215 {
 216         int changed;
 217         int open = 0;
 218         if (dir) {
 219                 if (dir > 0) {
 220                         open = 1;
 221                 } else if (dir < 0) {
 222                         if (val > 0) {
 223                                 open = 1;
 224                                 val--;
 225                         }
 226                 }
 227         }
 228         if (hw_is_mask(var))
 229                 changed = snd_mask_refine_min(hw_param_mask(params, var),
 230                                               val + !!open);
 231         else if (hw_is_interval(var))
 232                 changed = snd_interval_refine_min(hw_param_interval(params, var),
 233                                                   val, open);
 234         else
 235                 return -EINVAL;
 236         if (changed > 0) {
 237                 params->cmask |= 1 << var;
 238                 params->rmask |= 1 << var;
 239         }
 240         return changed;
 241 }
 242
 243 /**
 244  * snd_pcm_hw_param_min
 245  * @pcm: PCM instance
 246  * @params: the hw_params instance
 247  * @var: parameter to retrieve
 248  * @val: minimal value
 249  * @dir: pointer to the direction (-1,0,1) or NULL
 250  *
 251  * Inside configuration space defined by PARAMS remove from PAR all
 252  * values < VAL. Reduce configuration space accordingly.
 253  * Return new minimum or -EINVAL if the configuration space is empty
 254  */
 255 static int snd_pcm_hw_param_min(struct snd_pcm_substream *pcm,
 256                                 struct snd_pcm_hw_params *params,
 257                                 snd_pcm_hw_param_t var, unsigned int val,
 258                                 int *dir)
 259 {
 260         int changed = _snd_pcm_hw_param_min(params, var, val, dir ? *dir : 0);
 261         if (changed < 0)
 262                 return changed;
 263         if (params->rmask) {
 264                 int err = snd_pcm_hw_refine(pcm, params);
 265                 if (err < 0)
 266                         return err;
 267         }
 268         return snd_pcm_hw_param_value_min(params, var, dir);
 269 }
 270
 271 static int _snd_pcm_hw_param_max(struct snd_pcm_hw_params *params,
 272                                  snd_pcm_hw_param_t var, unsigned int val,
 273                                  int dir)
 274 {
 275         int changed;
 276         int open = 0;
 277         if (dir) {
 278                 if (dir < 0) {
 279                         open = 1;
 280                 } else if (dir > 0) {
 281                         open = 1;
 282                         val++;
 283                 }
 284         }
 285         if (hw_is_mask(var)) {
 286                 if (val == 0 && open) {
 287                         snd_mask_none(hw_param_mask(params, var));
 288                         changed = -EINVAL;
 289                 } else
 290                         changed = snd_mask_refine_max(hw_param_mask(params, var),
 291                                                       val - !!open);
 292         } else if (hw_is_interval(var))
 293                 changed = snd_interval_refine_max(hw_param_interval(params, var),
 294                                                   val, open);
 295         else
 296                 return -EINVAL;
 297         if (changed > 0) {
 298                 params->cmask |= 1 << var;
 299                 params->rmask |= 1 << var;
 300         }
 301         return changed;
 302 }
 303
 304 /**
 305  * snd_pcm_hw_param_max
 306  * @pcm: PCM instance
 307  * @params: the hw_params instance
 308  * @var: parameter to retrieve
 309  * @val: maximal value
 310  * @dir: pointer to the direction (-1,0,1) or NULL
 311  *
 312  * Inside configuration space defined by PARAMS remove from PAR all
 313  *  values >= VAL + 1. Reduce configuration space accordingly.
 314  *  Return new maximum or -EINVAL if the configuration space is empty
 315  */
 316 static int snd_pcm_hw_param_max(struct snd_pcm_substream *pcm,
 317                                 struct snd_pcm_hw_params *params,
 318                                 snd_pcm_hw_param_t var, unsigned int val,
 319                                 int *dir)
 320 {
 321         int changed = _snd_pcm_hw_param_max(params, var, val, dir ? *dir : 0);
 322         if (changed < 0)
 323                 return changed;
 324         if (params->rmask) {
 325                 int err = snd_pcm_hw_refine(pcm, params);
 326                 if (err < 0)
 327                         return err;
 328         }
 329         return snd_pcm_hw_param_value_max(params, var, dir);
 330 }
 331
 332 static int boundary_sub(int a, int adir,
 333                         int b, int bdir,
 334                         int *c, int *cdir)
 335 {
 336         adir = adir < 0 ? -1 : (adir > 0 ? 1 : 0);
 337         bdir = bdir < 0 ? -1 : (bdir > 0 ? 1 : 0);
 338         *c = a - b;
 339         *cdir = adir - bdir;
 340         if (*cdir == -2) {
 341                 (*c)--;
 342         } else if (*cdir == 2) {
 343                 (*c)++;
 344         }
 345         return 0;
 346 }
 347
 348 static int boundary_lt(unsigned int a, int adir,
 349                        unsigned int b, int bdir)
 350 {
 351         if (adir < 0) {
 352                 a--;
 353                 adir = 1;
 354         } else if (adir > 0)
 355                 adir = 1;
 356         if (bdir < 0) {
 357                 b--;
 358                 bdir = 1;
 359         } else if (bdir > 0)
 360                 bdir = 1;
 361         return a < b || (a == b && adir < bdir);
 362 }
 363
 364 /* Return 1 if min is nearer to best than max */
 365 static int boundary_nearer(int min, int mindir,
 366                            int best, int bestdir,
 367                            int max, int maxdir)
 368 {
 369         int dmin, dmindir;
 370         int dmax, dmaxdir;
 371         boundary_sub(best, bestdir, min, mindir, &dmin, &dmindir);
 372         boundary_sub(max, maxdir, best, bestdir, &dmax, &dmaxdir);
 373         return boundary_lt(dmin, dmindir, dmax, dmaxdir);
 374 }
 375
 376 /**
 377  * snd_pcm_hw_param_near
 378  * @pcm: PCM instance
 379  * @params: the hw_params instance
 380  * @var: parameter to retrieve
 381  * @best: value to set
 382  * @dir: pointer to the direction (-1,0,1) or NULL
 383  *
 384  * Inside configuration space defined by PARAMS set PAR to the available value
 385  * nearest to VAL. Reduce configuration space accordingly.
 386  * This function cannot be called for SNDRV_PCM_HW_PARAM_ACCESS,
 387  * SNDRV_PCM_HW_PARAM_FORMAT, SNDRV_PCM_HW_PARAM_SUBFORMAT.
 388  * Return the value found.
 389   */
 390 static int snd_pcm_hw_param_near(struct snd_pcm_substream *pcm,
 391                                  struct snd_pcm_hw_params *params,
 392                                  snd_pcm_hw_param_t var, unsigned int best,
 393                                  int *dir)
 394 {
 395         struct snd_pcm_hw_params *save = NULL;
 396         int v;
 397         unsigned int saved_min;
 398         int last = 0;
 399         int min, max;
 400         int mindir, maxdir;
 401         int valdir = dir ? *dir : 0;
 402         /* FIXME */
 403         if (best > INT_MAX)
 404                 best = INT_MAX;
 405         min = max = best;
 406         mindir = maxdir = valdir;
 407         if (maxdir > 0)
 408                 maxdir = 0;
 409         else if (maxdir == 0)
 410                 maxdir = -1;
 411         else {
 412                 maxdir = 1;
 413                 max--;
 414         }
 415         save = kmalloc(sizeof(*save), GFP_KERNEL);
 416         if (save == NULL)
 417                 return -ENOMEM;
 418         *save = *params;
 419         saved_min = min;
 420         min = snd_pcm_hw_param_min(pcm, params, var, min, &mindir);
 421         if (min >= 0) {
 422                 struct snd_pcm_hw_params *params1;
 423                 if (max < 0)
 424                         goto _end;
 425                 if ((unsigned int)min == saved_min && mindir == valdir)
 426                         goto _end;
 427                 params1 = kmalloc(sizeof(*params1), GFP_KERNEL);
 428                 if (params1 == NULL) {
 429                         kfree(save);
 430                         return -ENOMEM;
 431                 }
 432                 *params1 = *save;
 433                 max = snd_pcm_hw_param_max(pcm, params1, var, max, &maxdir);
 434                 if (max < 0) {
 435                         kfree(params1);
 436                         goto _end;
 437                 }
 438                 if (boundary_nearer(max, maxdir, best, valdir, min, mindir)) {
 439                         *params = *params1;
 440                         last = 1;
 441                 }
 442                 kfree(params1);
 443         } else {
 444                 *params = *save;
 445                 max = snd_pcm_hw_param_max(pcm, params, var, max, &maxdir);
 446                 if (max < 0) {
 447                         kfree(save);
 448                         return max;
 449                 }
 450                 last = 1;
 451         }
 452  _end:
 453         kfree(save);
 454         if (last)
 455                 v = snd_pcm_hw_param_last(pcm, params, var, dir);
 456         else
 457                 v = snd_pcm_hw_param_first(pcm, params, var, dir);
 458         return v;
 459 }
 460
 461 static int _snd_pcm_hw_param_set(struct snd_pcm_hw_params *params,
 462                                  snd_pcm_hw_param_t var, unsigned int val,
 463                                  int dir)
 464 {
 465         int changed;
 466         if (hw_is_mask(var)) {
 467                 struct snd_mask *m = hw_param_mask(params, var);
 468                 if (val == 0 && dir < 0) {
 469                         changed = -EINVAL;
 470                         snd_mask_none(m);
 471                 } else {
 472                         if (dir > 0)
 473                                 val++;
 474                         else if (dir < 0)
 475                                 val--;
 476                         changed = snd_mask_refine_set(hw_param_mask(params, var), val);
 477                 }
 478         } else if (hw_is_interval(var)) {
 479                 struct snd_interval *i = hw_param_interval(params, var);
 480                 if (val == 0 && dir < 0) {
 481                         changed = -EINVAL;
 482                         snd_interval_none(i);
 483                 } else if (dir == 0)
 484                         changed = snd_interval_refine_set(i, val);
 485                 else {
 486                         struct snd_interval t;
 487                         t.openmin = 1;
 488                         t.openmax = 1;
 489                         t.empty = 0;
 490                         t.integer = 0;
 491                         if (dir < 0) {
 492                                 t.min = val - 1;
 493                                 t.max = val;
 494                         } else {
 495                                 t.min = val;
 496                                 t.max = val+1;
 497                         }
 498                         changed = snd_interval_refine(i, &t);
 499                 }
 500         } else
 501                 return -EINVAL;
 502         if (changed > 0) {
 503                 params->cmask |= 1 << var;
 504                 params->rmask |= 1 << var;
 505         }
 506         return changed;
 507 }
 508
 509 /**
 510  * snd_pcm_hw_param_set
 511  * @pcm: PCM instance
 512  * @params: the hw_params instance
 513  * @var: parameter to retrieve
 514  * @val: value to set
 515  * @dir: pointer to the direction (-1,0,1) or NULL
 516  *
 517  * Inside configuration space defined by PARAMS remove from PAR all
 518  * values != VAL. Reduce configuration space accordingly.
 519  *  Return VAL or -EINVAL if the configuration space is empty
 520  */
 521 static int snd_pcm_hw_param_set(struct snd_pcm_substream *pcm,
 522                                 struct snd_pcm_hw_params *params,
 523                                 snd_pcm_hw_param_t var, unsigned int val,
 524                                 int dir)
 525 {
 526         int changed = _snd_pcm_hw_param_set(params, var, val, dir);
 527         if (changed < 0)
 528                 return changed;
 529         if (params->rmask) {
 530                 int err = snd_pcm_hw_refine(pcm, params);
 531                 if (err < 0)
 532                         return err;
 533         }
 534         return snd_pcm_hw_param_value(params, var, NULL);
 535 }
 536
 537 static int _snd_pcm_hw_param_setinteger(struct snd_pcm_hw_params *params,
 538                                         snd_pcm_hw_param_t var)
 539 {
 540         int changed;
 541         changed = snd_interval_setinteger(hw_param_interval(params, var));
 542         if (changed > 0) {
 543                 params->cmask |= 1 << var;
 544                 params->rmask |= 1 << var;
 545         }
 546         return changed;
 547 }
 548
 549 /*
 550  * plugin
 551  */
 552
 553 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
 554 static int snd_pcm_oss_plugin_clear(struct snd_pcm_substream *substream)
 555 {
 556         struct snd_pcm_runtime *runtime = substream->runtime;
 557         struct snd_pcm_plugin *plugin, *next;
 558
 559         plugin = runtime->oss.plugin_first;
 560         while (plugin) {
 561                 next = plugin->next;
 562                 snd_pcm_plugin_free(plugin);
 563                 plugin = next;
 564         }
 565         runtime->oss.plugin_first = runtime->oss.plugin_last = NULL;
 566         return 0;
 567 }
 568
 569 static int snd_pcm_plugin_insert(struct snd_pcm_plugin *plugin)
 570 {
 571         struct snd_pcm_runtime *runtime = plugin->plug->runtime;
 572         plugin->next = runtime->oss.plugin_first;
 573         plugin->prev = NULL;
 574         if (runtime->oss.plugin_first) {
 575                 runtime->oss.plugin_first->prev = plugin;
 576                 runtime->oss.plugin_first = plugin;
 577         } else {
 578                 runtime->oss.plugin_last =
 579                 runtime->oss.plugin_first = plugin;
 580         }
 581         return 0;
 582 }
 583
 584 int snd_pcm_plugin_append(struct snd_pcm_plugin *plugin)
 585 {
 586         struct snd_pcm_runtime *runtime = plugin->plug->runtime;
 587         plugin->next = NULL;
 588         plugin->prev = runtime->oss.plugin_last;
 589         if (runtime->oss.plugin_last) {
 590                 runtime->oss.plugin_last->next = plugin;
 591                 runtime->oss.plugin_last = plugin;
 592         } else {
 593                 runtime->oss.plugin_last =
 594                 runtime->oss.plugin_first = plugin;
 595         }
 596         return 0;
 597 }
 598 #endif /* CONFIG_SND_PCM_OSS_PLUGINS */
 599
 600 static long snd_pcm_oss_bytes(struct snd_pcm_substream *substream, long frames)
 601 {
 602         struct snd_pcm_runtime *runtime = substream->runtime;
 603         long buffer_size = snd_pcm_lib_buffer_bytes(substream);
 604         long bytes = frames_to_bytes(runtime, frames);
 605         if (buffer_size == runtime->oss.buffer_bytes)
 606                 return bytes;
 607 #if BITS_PER_LONG >= 64
 608         return runtime->oss.buffer_bytes * bytes / buffer_size;
 609 #else
 610         {
 611                 u64 bsize = (u64)runtime->oss.buffer_bytes * (u64)bytes;
 612                 return div_u64(bsize, buffer_size);
 613         }
 614 #endif
 615 }
 616
 617 static long snd_pcm_alsa_frames(struct snd_pcm_substream *substream, long bytes)
 618 {
 619         struct snd_pcm_runtime *runtime = substream->runtime;
 620         long buffer_size = snd_pcm_lib_buffer_bytes(substream);
 621         if (buffer_size == runtime->oss.buffer_bytes)
 622                 return bytes_to_frames(runtime, bytes);
 623         return bytes_to_frames(runtime, (buffer_size * bytes) / runtime->oss.buffer_bytes);
 624 }
 625
 626 static inline
 627 snd_pcm_uframes_t get_hw_ptr_period(struct snd_pcm_runtime *runtime)
 628 {
 629         return runtime->hw_ptr_interrupt;
 630 }
 631
 632 /* define extended formats in the recent OSS versions (if any) */
 633 /* linear formats */
 634 #define AFMT_S32_LE      0x00001000
 635 #define AFMT_S32_BE      0x00002000
 636 #define AFMT_S24_LE      0x00008000
 637 #define AFMT_S24_BE      0x00010000
 638 #define AFMT_S24_PACKED  0x00040000
 639
 640 /* other supported formats */
 641 #define AFMT_FLOAT       0x00004000
 642 #define AFMT_SPDIF_RAW   0x00020000
 643
 644 /* unsupported formats */
 645 #define AFMT_AC3         0x00000400
 646 #define AFMT_VORBIS      0x00000800
 647
 648 static snd_pcm_format_t snd_pcm_oss_format_from(int format)
 649 {
 650         switch (format) {
 651         case AFMT_MU_LAW:       return SNDRV_PCM_FORMAT_MU_LAW;
 652         case AFMT_A_LAW:        return SNDRV_PCM_FORMAT_A_LAW;
 653         case AFMT_IMA_ADPCM:    return SNDRV_PCM_FORMAT_IMA_ADPCM;
 654         case AFMT_U8:           return SNDRV_PCM_FORMAT_U8;
 655         case AFMT_S16_LE:       return SNDRV_PCM_FORMAT_S16_LE;
 656         case AFMT_S16_BE:       return SNDRV_PCM_FORMAT_S16_BE;
 657         case AFMT_S8:           return SNDRV_PCM_FORMAT_S8;
 658         case AFMT_U16_LE:       return SNDRV_PCM_FORMAT_U16_LE;
 659         case AFMT_U16_BE:       return SNDRV_PCM_FORMAT_U16_BE;
 660         case AFMT_MPEG:         return SNDRV_PCM_FORMAT_MPEG;
 661         case AFMT_S32_LE:       return SNDRV_PCM_FORMAT_S32_LE;
 662         case AFMT_S32_BE:       return SNDRV_PCM_FORMAT_S32_BE;
 663         case AFMT_S24_LE:       return SNDRV_PCM_FORMAT_S24_LE;
 664         case AFMT_S24_BE:       return SNDRV_PCM_FORMAT_S24_BE;
 665         case AFMT_S24_PACKED:   return SNDRV_PCM_FORMAT_S24_3LE;
 666         case AFMT_FLOAT:        return SNDRV_PCM_FORMAT_FLOAT;
 667         case AFMT_SPDIF_RAW:    return SNDRV_PCM_FORMAT_IEC958_SUBFRAME;
 668         default:                return SNDRV_PCM_FORMAT_U8;
 669         }
 670 }
 671
 672 static int snd_pcm_oss_format_to(snd_pcm_format_t format)
 673 {
 674         switch (format) {
 675         case SNDRV_PCM_FORMAT_MU_LAW:   return AFMT_MU_LAW;
 676         case SNDRV_PCM_FORMAT_A_LAW:    return AFMT_A_LAW;
 677         case SNDRV_PCM_FORMAT_IMA_ADPCM:        return AFMT_IMA_ADPCM;
 678         case SNDRV_PCM_FORMAT_U8:               return AFMT_U8;
 679         case SNDRV_PCM_FORMAT_S16_LE:   return AFMT_S16_LE;
 680         case SNDRV_PCM_FORMAT_S16_BE:   return AFMT_S16_BE;
 681         case SNDRV_PCM_FORMAT_S8:               return AFMT_S8;
 682         case SNDRV_PCM_FORMAT_U16_LE:   return AFMT_U16_LE;
 683         case SNDRV_PCM_FORMAT_U16_BE:   return AFMT_U16_BE;
 684         case SNDRV_PCM_FORMAT_MPEG:             return AFMT_MPEG;
 685         case SNDRV_PCM_FORMAT_S32_LE:   return AFMT_S32_LE;
 686         case SNDRV_PCM_FORMAT_S32_BE:   return AFMT_S32_BE;
 687         case SNDRV_PCM_FORMAT_S24_LE:   return AFMT_S24_LE;
 688         case SNDRV_PCM_FORMAT_S24_BE:   return AFMT_S24_BE;
 689         case SNDRV_PCM_FORMAT_S24_3LE:  return AFMT_S24_PACKED;
 690         case SNDRV_PCM_FORMAT_FLOAT:    return AFMT_FLOAT;
 691         case SNDRV_PCM_FORMAT_IEC958_SUBFRAME: return AFMT_SPDIF_RAW;
 692         default:                        return -EINVAL;
 693         }
 694 }
 695
 696 static int snd_pcm_oss_period_size(struct snd_pcm_substream *substream,
 697                                    struct snd_pcm_hw_params *oss_params,
 698                                    struct snd_pcm_hw_params *slave_params)
 699 {
 700         size_t s;
 701         size_t oss_buffer_size, oss_period_size, oss_periods;
 702         size_t min_period_size, max_period_size;
 703         struct snd_pcm_runtime *runtime = substream->runtime;
 704         size_t oss_frame_size;
 705
 706         oss_frame_size = snd_pcm_format_physical_width(params_format(oss_params)) *
 707                          params_channels(oss_params) / 8;
 708
 709         oss_buffer_size = snd_pcm_plug_client_size(substream,
 710                                                    snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, NULL)) * oss_frame_size;
 711         oss_buffer_size = rounddown_pow_of_two(oss_buffer_size);
 712         if (atomic_read(&substream->mmap_count)) {
 713                 if (oss_buffer_size > runtime->oss.mmap_bytes)
 714                         oss_buffer_size = runtime->oss.mmap_bytes;
 715         }
 716
 717         if (substream->oss.setup.period_size > 16)
 718                 oss_period_size = substream->oss.setup.period_size;
 719         else if (runtime->oss.fragshift) {
 720                 oss_period_size = 1 << runtime->oss.fragshift;
 721                 if (oss_period_size > oss_buffer_size / 2)
 722                         oss_period_size = oss_buffer_size / 2;
 723         } else {
 724                 int sd;
 725                 size_t bytes_per_sec = params_rate(oss_params) * snd_pcm_format_physical_width(params_format(oss_params)) * params_channels(oss_params) / 8;
 726
 727                 oss_period_size = oss_buffer_size;
 728                 do {
 729                         oss_period_size /= 2;
 730                 } while (oss_period_size > bytes_per_sec);
 731                 if (runtime->oss.subdivision == 0) {
 732                         sd = 4;
 733                         if (oss_period_size / sd > 4096)
 734                                 sd *= 2;
 735                         if (oss_period_size / sd < 4096)
 736                                 sd = 1;
 737                 } else
 738                         sd = runtime->oss.subdivision;
 739                 oss_period_size /= sd;
 740                 if (oss_period_size < 16)
 741                         oss_period_size = 16;
 742         }
 743
 744         min_period_size = snd_pcm_plug_client_size(substream,
 745                                                    snd_pcm_hw_param_value_min(slave_params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, NULL));
 746         min_period_size *= oss_frame_size;
 747         min_period_size = roundup_pow_of_two(min_period_size);
 748         if (oss_period_size < min_period_size)
 749                 oss_period_size = min_period_size;
 750
 751         max_period_size = snd_pcm_plug_client_size(substream,
 752                                                    snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, NULL));
 753         max_period_size *= oss_frame_size;
 754         max_period_size = rounddown_pow_of_two(max_period_size);
 755         if (oss_period_size > max_period_size)
 756                 oss_period_size = max_period_size;
 757
 758         oss_periods = oss_buffer_size / oss_period_size;
 759
 760         if (substream->oss.setup.periods > 1)
 761                 oss_periods = substream->oss.setup.periods;
 762
 763         s = snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_PERIODS, NULL);
 764         if (runtime->oss.maxfrags && s > runtime->oss.maxfrags)
 765                 s = runtime->oss.maxfrags;
 766         if (oss_periods > s)
 767                 oss_periods = s;
 768
 769         s = snd_pcm_hw_param_value_min(slave_params, SNDRV_PCM_HW_PARAM_PERIODS, NULL);
 770         if (s < 2)
 771                 s = 2;
 772         if (oss_periods < s)
 773                 oss_periods = s;
 774
 775         while (oss_period_size * oss_periods > oss_buffer_size)
 776                 oss_period_size /= 2;
 777
 778         if (oss_period_size < 16)
 779                 return -EINVAL;
 780         runtime->oss.period_bytes = oss_period_size;
 781         runtime->oss.period_frames = 1;
 782         runtime->oss.periods = oss_periods;
 783         return 0;
 784 }
 785
 786 static int choose_rate(struct snd_pcm_substream *substream,
 787                        struct snd_pcm_hw_params *params, unsigned int best_rate)
 788 {
 789         const struct snd_interval *it;
 790         struct snd_pcm_hw_params *save;
 791         unsigned int rate, prev;
 792
 793         save = kmalloc(sizeof(*save), GFP_KERNEL);
 794         if (save == NULL)
 795                 return -ENOMEM;
 796         *save = *params;
 797         it = hw_param_interval_c(save, SNDRV_PCM_HW_PARAM_RATE);
 798
 799         /* try multiples of the best rate */
 800         rate = best_rate;
 801         for (;;) {
 802                 if (it->max < rate || (it->max == rate && it->openmax))
 803                         break;
 804                 if (it->min < rate || (it->min == rate && !it->openmin)) {
 805                         int ret;
 806                         ret = snd_pcm_hw_param_set(substream, params,
 807                                                    SNDRV_PCM_HW_PARAM_RATE,
 808                                                    rate, 0);
 809                         if (ret == (int)rate) {
 810                                 kfree(save);
 811                                 return rate;
 812                         }
 813                         *params = *save;
 814                 }
 815                 prev = rate;
 816                 rate += best_rate;
 817                 if (rate <= prev)
 818                         break;
 819         }
 820
 821         /* not found, use the nearest rate */
 822         kfree(save);
 823         return snd_pcm_hw_param_near(substream, params, SNDRV_PCM_HW_PARAM_RATE, best_rate, NULL);
 824 }
 825
 826 /* parameter locking: returns immediately if tried during streaming */
 827 static int lock_params(struct snd_pcm_runtime *runtime)
 828 {
 829         if (mutex_lock_interruptible(&runtime->oss.params_lock))
 830                 return -ERESTARTSYS;
 831         if (atomic_read(&runtime->oss.rw_ref)) {
 832                 mutex_unlock(&runtime->oss.params_lock);
 833                 return -EBUSY;
 834         }
 835         return 0;
 836 }
 837
 838 static void unlock_params(struct snd_pcm_runtime *runtime)
 839 {
 840         mutex_unlock(&runtime->oss.params_lock);
 841 }
 842
 843 /* call with params_lock held */
 844 static int snd_pcm_oss_change_params_locked(struct snd_pcm_substream *substream)
 845 {
 846         struct snd_pcm_runtime *runtime = substream->runtime;
 847         struct snd_pcm_hw_params *params, *sparams;
 848         struct snd_pcm_sw_params *sw_params;
 849         ssize_t oss_buffer_size, oss_period_size;
 850         size_t oss_frame_size;
 851         int err;
 852         int direct;
 853         snd_pcm_format_t format, sformat;
 854         int n;
 855         const struct snd_mask *sformat_mask;
 856         struct snd_mask mask;
 857
 858         if (!runtime->oss.params)
 859                 return 0;
 860         sw_params = kzalloc(sizeof(*sw_params), GFP_KERNEL);
 861         params = kmalloc(sizeof(*params), GFP_KERNEL);
 862         sparams = kmalloc(sizeof(*sparams), GFP_KERNEL);
 863         if (!sw_params || !params || !sparams) {
 864                 err = -ENOMEM;
 865                 goto failure;
 866         }
 867
 868         if (atomic_read(&substream->mmap_count))
 869                 direct = 1;
 870         else
 871                 direct = substream->oss.setup.direct;
 872
 873         _snd_pcm_hw_params_any(sparams);
 874         _snd_pcm_hw_param_setinteger(sparams, SNDRV_PCM_HW_PARAM_PERIODS);
 875         _snd_pcm_hw_param_min(sparams, SNDRV_PCM_HW_PARAM_PERIODS, 2, 0);
 876         snd_mask_none(&mask);
 877         if (atomic_read(&substream->mmap_count))
 878                 snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_MMAP_INTERLEAVED);
 879         else {
 880                 snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_RW_INTERLEAVED);
 881                 if (!direct)
 882                         snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
 883         }
 884         err = snd_pcm_hw_param_mask(substream, sparams, SNDRV_PCM_HW_PARAM_ACCESS, &mask);
 885         if (err < 0) {
 886                 pcm_dbg(substream->pcm, "No usable accesses\n");
 887                 err = -EINVAL;
 888                 goto failure;
 889         }
 890         choose_rate(substream, sparams, runtime->oss.rate);
 891         snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_CHANNELS, runtime->oss.channels, NULL);
 892
 893         format = snd_pcm_oss_format_from(runtime->oss.format);
 894
 895         sformat_mask = hw_param_mask_c(sparams, SNDRV_PCM_HW_PARAM_FORMAT);
 896         if (direct)
 897                 sformat = format;
 898         else
 899                 sformat = snd_pcm_plug_slave_format(format, sformat_mask);
 900
 901         if ((__force int)sformat < 0 ||
 902             !snd_mask_test(sformat_mask, (__force int)sformat)) {
 903                 for (sformat = (__force snd_pcm_format_t)0;
 904                      (__force int)sformat <= (__force int)SNDRV_PCM_FORMAT_LAST;
 905                      sformat = (__force snd_pcm_format_t)((__force int)sformat + 1)) {
 906                         if (snd_mask_test(sformat_mask, (__force int)sformat) &&
 907                             snd_pcm_oss_format_to(sformat) >= 0)
 908                                 break;
 909                 }
 910                 if ((__force int)sformat > (__force int)SNDRV_PCM_FORMAT_LAST) {
 911                         pcm_dbg(substream->pcm, "Cannot find a format!!!\n");
 912                         err = -EINVAL;
 913                         goto failure;
 914                 }
 915         }
 916         err = _snd_pcm_hw_param_set(sparams, SNDRV_PCM_HW_PARAM_FORMAT, (__force int)sformat, 0);
 917         if (err < 0)
 918                 goto failure;
 919
 920         if (direct) {
 921                 memcpy(params, sparams, sizeof(*params));
 922         } else {
 923                 _snd_pcm_hw_params_any(params);
 924                 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_ACCESS,
 925                                       (__force int)SNDRV_PCM_ACCESS_RW_INTERLEAVED, 0);
 926                 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_FORMAT,
 927                                       (__force int)snd_pcm_oss_format_from(runtime->oss.format), 0);
 928                 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_CHANNELS,
 929                                       runtime->oss.channels, 0);
 930                 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_RATE,
 931                                       runtime->oss.rate, 0);
 932                 pdprintf("client: access = %i, format = %i, channels = %i, rate = %i\n",
 933                          params_access(params), params_format(params),
 934                          params_channels(params), params_rate(params));
 935         }
 936         pdprintf("slave: access = %i, format = %i, channels = %i, rate = %i\n",
 937                  params_access(sparams), params_format(sparams),
 938                  params_channels(sparams), params_rate(sparams));
 939
 940         oss_frame_size = snd_pcm_format_physical_width(params_format(params)) *
 941                          params_channels(params) / 8;
 942
 943         err = snd_pcm_oss_period_size(substream, params, sparams);
 944         if (err < 0)
 945                 goto failure;
 946
 947         n = snd_pcm_plug_slave_size(substream, runtime->oss.period_bytes / oss_frame_size);
 948         err = snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, n, NULL);
 949         if (err < 0)
 950                 goto failure;
 951
 952         err = snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_PERIODS,
 953                                      runtime->oss.periods, NULL);
 954         if (err < 0)
 955                 goto failure;
 956
 957         snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
 958
 959         err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_HW_PARAMS, sparams);
 960         if (err < 0) {
 961                 pcm_dbg(substream->pcm, "HW_PARAMS failed: %i\n", err);
 962                 goto failure;
 963         }
 964
 965 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
 966         snd_pcm_oss_plugin_clear(substream);
 967         if (!direct) {
 968                 /* add necessary plugins */
 969                 snd_pcm_oss_plugin_clear(substream);
 970                 if ((err = snd_pcm_plug_format_plugins(substream,
 971                                                        params,
 972                                                        sparams)) < 0) {
 973                         pcm_dbg(substream->pcm,
 974                                 "snd_pcm_plug_format_plugins failed: %i\n", err);
 975                         snd_pcm_oss_plugin_clear(substream);
 976                         goto failure;
 977                 }
 978                 if (runtime->oss.plugin_first) {
 979                         struct snd_pcm_plugin *plugin;
 980                         if ((err = snd_pcm_plugin_build_io(substream, sparams, &plugin)) < 0) {
 981                                 pcm_dbg(substream->pcm,
 982                                         "snd_pcm_plugin_build_io failed: %i\n", err);
 983                                 snd_pcm_oss_plugin_clear(substream);
 984                                 goto failure;
 985                         }
 986                         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 987                                 err = snd_pcm_plugin_append(plugin);
 988                         } else {
 989                                 err = snd_pcm_plugin_insert(plugin);
 990                         }
 991                         if (err < 0) {
 992                                 snd_pcm_oss_plugin_clear(substream);
 993                                 goto failure;
 994                         }
 995                 }
 996         }
 997 #endif
 998
 999         if (runtime->oss.trigger) {
1000                 sw_params->start_threshold = 1;
1001         } else {
1002                 sw_params->start_threshold = runtime->boundary;
1003         }
1004         if (atomic_read(&substream->mmap_count) ||
1005             substream->stream == SNDRV_PCM_STREAM_CAPTURE)
1006                 sw_params->stop_threshold = runtime->boundary;
1007         else
1008                 sw_params->stop_threshold = runtime->buffer_size;
1009         sw_params->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
1010         sw_params->period_step = 1;
1011         sw_params->avail_min = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
1012                 1 : runtime->period_size;
1013         if (atomic_read(&substream->mmap_count) ||
1014             substream->oss.setup.nosilence) {
1015                 sw_params->silence_threshold = 0;
1016                 sw_params->silence_size = 0;
1017         } else {
1018                 snd_pcm_uframes_t frames;
1019                 frames = runtime->period_size + 16;
1020                 if (frames > runtime->buffer_size)
1021                         frames = runtime->buffer_size;
1022                 sw_params->silence_threshold = frames;
1023                 sw_params->silence_size = frames;
1024         }
1025
1026         if ((err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_SW_PARAMS, sw_params)) < 0) {
1027                 pcm_dbg(substream->pcm, "SW_PARAMS failed: %i\n", err);
1028                 goto failure;
1029         }
1030
1031         runtime->oss.periods = params_periods(sparams);
1032         oss_period_size = snd_pcm_plug_client_size(substream, params_period_size(sparams));
1033         if (oss_period_size < 0) {
1034                 err = -EINVAL;
1035                 goto failure;
1036         }
1037 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1038         if (runtime->oss.plugin_first) {
1039                 err = snd_pcm_plug_alloc(substream, oss_period_size);
1040                 if (err < 0)
1041                         goto failure;
1042         }
1043 #endif
1044         oss_period_size *= oss_frame_size;
1045
1046         oss_buffer_size = oss_period_size * runtime->oss.periods;
1047         if (oss_buffer_size < 0) {
1048                 err = -EINVAL;
1049                 goto failure;
1050         }
1051
1052         runtime->oss.period_bytes = oss_period_size;
1053         runtime->oss.buffer_bytes = oss_buffer_size;
1054
1055         pdprintf("oss: period bytes = %i, buffer bytes = %i\n",
1056                  runtime->oss.period_bytes,
1057                  runtime->oss.buffer_bytes);
1058         pdprintf("slave: period_size = %i, buffer_size = %i\n",
1059                  params_period_size(sparams),
1060                  params_buffer_size(sparams));
1061
1062         runtime->oss.format = snd_pcm_oss_format_to(params_format(params));
1063         runtime->oss.channels = params_channels(params);
1064         runtime->oss.rate = params_rate(params);
1065
1066         kvfree(runtime->oss.buffer);
1067         runtime->oss.buffer = kvzalloc(runtime->oss.period_bytes, GFP_KERNEL);
1068         if (!runtime->oss.buffer) {
1069                 err = -ENOMEM;
1070                 goto failure;
1071         }
1072
1073         runtime->oss.params = 0;
1074         runtime->oss.prepare = 1;
1075         runtime->oss.buffer_used = 0;
1076         if (runtime->dma_area)
1077                 snd_pcm_format_set_silence(runtime->format, runtime->dma_area, bytes_to_samples(runtime, runtime->dma_bytes));
1078
1079         runtime->oss.period_frames = snd_pcm_alsa_frames(substream, oss_period_size);
1080
1081         err = 0;
1082 failure:
1083         kfree(sw_params);
1084         kfree(params);
1085         kfree(sparams);
1086         return err;
1087 }
1088
1089 /* this one takes the lock by itself */
1090 static int snd_pcm_oss_change_params(struct snd_pcm_substream *substream,
1091                                      bool trylock)
1092 {
1093         struct snd_pcm_runtime *runtime = substream->runtime;
1094         int err;
1095
1096         if (trylock) {
1097                 if (!(mutex_trylock(&runtime->oss.params_lock)))
1098                         return -EAGAIN;
1099         } else if (mutex_lock_interruptible(&runtime->oss.params_lock))
1100                 return -ERESTARTSYS;
1101
1102         err = snd_pcm_oss_change_params_locked(substream);
1103         mutex_unlock(&runtime->oss.params_lock);
1104         return err;
1105 }
1106
1107 static int snd_pcm_oss_get_active_substream(struct snd_pcm_oss_file *pcm_oss_file, struct snd_pcm_substream **r_substream)
1108 {
1109         int idx, err;
1110         struct snd_pcm_substream *asubstream = NULL, *substream;
1111
1112         for (idx = 0; idx < 2; idx++) {
1113                 substream = pcm_oss_file->streams[idx];
1114                 if (substream == NULL)
1115                         continue;
1116                 if (asubstream == NULL)
1117                         asubstream = substream;
1118                 if (substream->runtime->oss.params) {
1119                         err = snd_pcm_oss_change_params(substream, false);
1120                         if (err < 0)
1121                                 return err;
1122                 }
1123         }
1124         if (!asubstream)
1125                 return -EIO;
1126         if (r_substream)
1127                 *r_substream = asubstream;
1128         return 0;
1129 }
1130
1131 /* call with params_lock held */
1132 /* NOTE: this always call PREPARE unconditionally no matter whether
1133  * runtime->oss.prepare is set or not
1134  */
1135 static int snd_pcm_oss_prepare(struct snd_pcm_substream *substream)
1136 {
1137         int err;
1138         struct snd_pcm_runtime *runtime = substream->runtime;
1139
1140         err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_PREPARE, NULL);
1141         if (err < 0) {
1142                 pcm_dbg(substream->pcm,
1143                         "snd_pcm_oss_prepare: SNDRV_PCM_IOCTL_PREPARE failed\n");
1144                 return err;
1145         }
1146         runtime->oss.prepare = 0;
1147         runtime->oss.prev_hw_ptr_period = 0;
1148         runtime->oss.period_ptr = 0;
1149         runtime->oss.buffer_used = 0;
1150
1151         return 0;
1152 }
1153
1154 static int snd_pcm_oss_make_ready(struct snd_pcm_substream *substream)
1155 {
1156         struct snd_pcm_runtime *runtime;
1157         int err;
1158
1159         runtime = substream->runtime;
1160         if (runtime->oss.params) {
1161                 err = snd_pcm_oss_change_params(substream, false);
1162                 if (err < 0)
1163                         return err;
1164         }
1165         if (runtime->oss.prepare) {
1166                 if (mutex_lock_interruptible(&runtime->oss.params_lock))
1167                         return -ERESTARTSYS;
1168                 err = snd_pcm_oss_prepare(substream);
1169                 mutex_unlock(&runtime->oss.params_lock);
1170                 if (err < 0)
1171                         return err;
1172         }
1173         return 0;
1174 }
1175
1176 /* call with params_lock held */
1177 static int snd_pcm_oss_make_ready_locked(struct snd_pcm_substream *substream)
1178 {
1179         struct snd_pcm_runtime *runtime;
1180         int err;
1181
1182         runtime = substream->runtime;
1183         if (runtime->oss.params) {
1184                 err = snd_pcm_oss_change_params_locked(substream);
1185                 if (err < 0)
1186                         return err;
1187         }
1188         if (runtime->oss.prepare) {
1189                 err = snd_pcm_oss_prepare(substream);
1190                 if (err < 0)
1191                         return err;
1192         }
1193         return 0;
1194 }
1195
1196 static int snd_pcm_oss_capture_position_fixup(struct snd_pcm_substream *substream, snd_pcm_sframes_t *delay)
1197 {
1198         struct snd_pcm_runtime *runtime;
1199         snd_pcm_uframes_t frames;
1200         int err = 0;
1201
1202         while (1) {
1203                 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, delay);
1204                 if (err < 0)
1205                         break;
1206                 runtime = substream->runtime;
1207                 if (*delay <= (snd_pcm_sframes_t)runtime->buffer_size)
1208                         break;
1209                 /* in case of overrun, skip whole periods like OSS/Linux driver does */
1210                 /* until avail(delay) <= buffer_size */
1211                 frames = (*delay - runtime->buffer_size) + runtime->period_size - 1;
1212                 frames /= runtime->period_size;
1213                 frames *= runtime->period_size;
1214                 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_FORWARD, &frames);
1215                 if (err < 0)
1216                         break;
1217         }
1218         return err;
1219 }
1220
1221 snd_pcm_sframes_t snd_pcm_oss_write3(struct snd_pcm_substream *substream, const char *ptr, snd_pcm_uframes_t frames, int in_kernel)
1222 {
1223         struct snd_pcm_runtime *runtime = substream->runtime;
1224         int ret;
1225         while (1) {
1226                 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1227                     runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1228 #ifdef OSS_DEBUG
1229                         pcm_dbg(substream->pcm,
1230                                 "pcm_oss: write: recovering from %s\n",
1231                                 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1232                                 "XRUN" : "SUSPEND");
1233 #endif
1234                         ret = snd_pcm_oss_prepare(substream);
1235                         if (ret < 0)
1236                                 break;
1237                 }
1238                 ret = __snd_pcm_lib_xfer(substream, (void *)ptr, true,
1239                                          frames, in_kernel);
1240                 if (ret != -EPIPE && ret != -ESTRPIPE)
1241                         break;
1242                 /* test, if we can't store new data, because the stream */
1243                 /* has not been started */
1244                 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED)
1245                         return -EAGAIN;
1246         }
1247         return ret;
1248 }
1249
1250 snd_pcm_sframes_t snd_pcm_oss_read3(struct snd_pcm_substream *substream, char *ptr, snd_pcm_uframes_t frames, int in_kernel)
1251 {
1252         struct snd_pcm_runtime *runtime = substream->runtime;
1253         snd_pcm_sframes_t delay;
1254         int ret;
1255         while (1) {
1256                 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1257                     runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1258 #ifdef OSS_DEBUG
1259                         pcm_dbg(substream->pcm,
1260                                 "pcm_oss: read: recovering from %s\n",
1261                                 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1262                                 "XRUN" : "SUSPEND");
1263 #endif
1264                         ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1265                         if (ret < 0)
1266                                 break;
1267                 } else if (runtime->status->state == SNDRV_PCM_STATE_SETUP) {
1268                         ret = snd_pcm_oss_prepare(substream);
1269                         if (ret < 0)
1270                                 break;
1271                 }
1272                 ret = snd_pcm_oss_capture_position_fixup(substream, &delay);
1273                 if (ret < 0)
1274                         break;
1275                 ret = __snd_pcm_lib_xfer(substream, (void *)ptr, true,
1276                                          frames, in_kernel);
1277                 if (ret == -EPIPE) {
1278                         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1279                                 ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1280                                 if (ret < 0)
1281                                         break;
1282                         }
1283                         continue;
1284                 }
1285                 if (ret != -ESTRPIPE)
1286                         break;
1287         }
1288         return ret;
1289 }
1290
1291 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1292 snd_pcm_sframes_t snd_pcm_oss_writev3(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames)
1293 {
1294         struct snd_pcm_runtime *runtime = substream->runtime;
1295         int ret;
1296         while (1) {
1297                 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1298                     runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1299 #ifdef OSS_DEBUG
1300                         pcm_dbg(substream->pcm,
1301                                 "pcm_oss: writev: recovering from %s\n",
1302                                 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1303                                 "XRUN" : "SUSPEND");
1304 #endif
1305                         ret = snd_pcm_oss_prepare(substream);
1306                         if (ret < 0)
1307                                 break;
1308                 }
1309                 ret = snd_pcm_kernel_writev(substream, bufs, frames);
1310                 if (ret != -EPIPE && ret != -ESTRPIPE)
1311                         break;
1312
1313                 /* test, if we can't store new data, because the stream */
1314                 /* has not been started */
1315                 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED)
1316                         return -EAGAIN;
1317         }
1318         return ret;
1319 }
1320
1321 snd_pcm_sframes_t snd_pcm_oss_readv3(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames)
1322 {
1323         struct snd_pcm_runtime *runtime = substream->runtime;
1324         int ret;
1325         while (1) {
1326                 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1327                     runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1328 #ifdef OSS_DEBUG
1329                         pcm_dbg(substream->pcm,
1330                                 "pcm_oss: readv: recovering from %s\n",
1331                                 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1332                                 "XRUN" : "SUSPEND");
1333 #endif
1334                         ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1335                         if (ret < 0)
1336                                 break;
1337                 } else if (runtime->status->state == SNDRV_PCM_STATE_SETUP) {
1338                         ret = snd_pcm_oss_prepare(substream);
1339                         if (ret < 0)
1340                                 break;
1341                 }
1342                 ret = snd_pcm_kernel_readv(substream, bufs, frames);
1343                 if (ret != -EPIPE && ret != -ESTRPIPE)
1344                         break;
1345         }
1346         return ret;
1347 }
1348 #endif /* CONFIG_SND_PCM_OSS_PLUGINS */
1349
1350 static ssize_t snd_pcm_oss_write2(struct snd_pcm_substream *substream, const char *buf, size_t bytes, int in_kernel)
1351 {
1352         struct snd_pcm_runtime *runtime = substream->runtime;
1353         snd_pcm_sframes_t frames, frames1;
1354 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1355         if (runtime->oss.plugin_first) {
1356                 struct snd_pcm_plugin_channel *channels;
1357                 size_t oss_frame_bytes = (runtime->oss.plugin_first->src_width * runtime->oss.plugin_first->src_format.channels) / 8;
1358                 if (!in_kernel) {
1359                         if (copy_from_user(runtime->oss.buffer, (const char __force __user *)buf, bytes))
1360                                 return -EFAULT;
1361                         buf = runtime->oss.buffer;
1362                 }
1363                 frames = bytes / oss_frame_bytes;
1364                 frames1 = snd_pcm_plug_client_channels_buf(substream, (char *)buf, frames, &channels);
1365                 if (frames1 < 0)
1366                         return frames1;
1367                 frames1 = snd_pcm_plug_write_transfer(substream, channels, frames1);
1368                 if (frames1 <= 0)
1369                         return frames1;
1370                 bytes = frames1 * oss_frame_bytes;
1371         } else
1372 #endif
1373         {
1374                 frames = bytes_to_frames(runtime, bytes);
1375                 frames1 = snd_pcm_oss_write3(substream, buf, frames, in_kernel);
1376                 if (frames1 <= 0)
1377                         return frames1;
1378                 bytes = frames_to_bytes(runtime, frames1);
1379         }
1380         return bytes;
1381 }
1382
1383 static ssize_t snd_pcm_oss_write1(struct snd_pcm_substream *substream, const char __user *buf, size_t bytes)
1384 {
1385         size_t xfer = 0;
1386         ssize_t tmp = 0;
1387         struct snd_pcm_runtime *runtime = substream->runtime;
1388
1389         if (atomic_read(&substream->mmap_count))
1390                 return -ENXIO;
1391
1392         atomic_inc(&runtime->oss.rw_ref);
1393         while (bytes > 0) {
1394                 if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1395                         tmp = -ERESTARTSYS;
1396                         break;
1397                 }
1398                 tmp = snd_pcm_oss_make_ready_locked(substream);
1399                 if (tmp < 0)
1400                         goto err;
1401                 if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) {
1402                         tmp = bytes;
1403                         if (tmp + runtime->oss.buffer_used > runtime->oss.period_bytes)
1404                                 tmp = runtime->oss.period_bytes - runtime->oss.buffer_used;
1405                         if (tmp > 0) {
1406                                 if (copy_from_user(runtime->oss.buffer + runtime->oss.buffer_used, buf, tmp)) {
1407                                         tmp = -EFAULT;
1408                                         goto err;
1409                                 }
1410                         }
1411                         runtime->oss.buffer_used += tmp;
1412                         buf += tmp;
1413                         bytes -= tmp;
1414                         xfer += tmp;
1415                         if (substream->oss.setup.partialfrag ||
1416                             runtime->oss.buffer_used == runtime->oss.period_bytes) {
1417                                 tmp = snd_pcm_oss_write2(substream, runtime->oss.buffer + runtime->oss.period_ptr,
1418                                                          runtime->oss.buffer_used - runtime->oss.period_ptr, 1);
1419                                 if (tmp <= 0)
1420                                         goto err;
1421                                 runtime->oss.bytes += tmp;
1422                                 runtime->oss.period_ptr += tmp;
1423                                 runtime->oss.period_ptr %= runtime->oss.period_bytes;
1424                                 if (runtime->oss.period_ptr == 0 ||
1425                                     runtime->oss.period_ptr == runtime->oss.buffer_used)
1426                                         runtime->oss.buffer_used = 0;
1427                                 else if ((substream->f_flags & O_NONBLOCK) != 0) {
1428                                         tmp = -EAGAIN;
1429                                         goto err;
1430                                 }
1431                         }
1432                 } else {
1433                         tmp = snd_pcm_oss_write2(substream,
1434                                                  (const char __force *)buf,
1435                                                  runtime->oss.period_bytes, 0);
1436                         if (tmp <= 0)
1437                                 goto err;
1438                         runtime->oss.bytes += tmp;
1439                         buf += tmp;
1440                         bytes -= tmp;
1441                         xfer += tmp;
1442                         if ((substream->f_flags & O_NONBLOCK) != 0 &&
1443                             tmp != runtime->oss.period_bytes)
1444                                 tmp = -EAGAIN;
1445                 }
1446  err:
1447                 mutex_unlock(&runtime->oss.params_lock);
1448                 if (tmp < 0)
1449                         break;
1450                 if (signal_pending(current)) {
1451                         tmp = -ERESTARTSYS;
1452                         break;
1453                 }
1454                 tmp = 0;
1455         }
1456         atomic_dec(&runtime->oss.rw_ref);
1457         return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
1458 }
1459
1460 static ssize_t snd_pcm_oss_read2(struct snd_pcm_substream *substream, char *buf, size_t bytes, int in_kernel)
1461 {
1462         struct snd_pcm_runtime *runtime = substream->runtime;
1463         snd_pcm_sframes_t frames, frames1;
1464 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1465         char __user *final_dst = (char __force __user *)buf;
1466         if (runtime->oss.plugin_first) {
1467                 struct snd_pcm_plugin_channel *channels;
1468                 size_t oss_frame_bytes = (runtime->oss.plugin_last->dst_width * runtime->oss.plugin_last->dst_format.channels) / 8;
1469                 if (!in_kernel)
1470                         buf = runtime->oss.buffer;
1471                 frames = bytes / oss_frame_bytes;
1472                 frames1 = snd_pcm_plug_client_channels_buf(substream, buf, frames, &channels);
1473                 if (frames1 < 0)
1474                         return frames1;
1475                 frames1 = snd_pcm_plug_read_transfer(substream, channels, frames1);
1476                 if (frames1 <= 0)
1477                         return frames1;
1478                 bytes = frames1 * oss_frame_bytes;
1479                 if (!in_kernel && copy_to_user(final_dst, buf, bytes))
1480                         return -EFAULT;
1481         } else
1482 #endif
1483         {
1484                 frames = bytes_to_frames(runtime, bytes);
1485                 frames1 = snd_pcm_oss_read3(substream, buf, frames, in_kernel);
1486                 if (frames1 <= 0)
1487                         return frames1;
1488                 bytes = frames_to_bytes(runtime, frames1);
1489         }
1490         return bytes;
1491 }
1492
1493 static ssize_t snd_pcm_oss_read1(struct snd_pcm_substream *substream, char __user *buf, size_t bytes)
1494 {
1495         size_t xfer = 0;
1496         ssize_t tmp = 0;
1497         struct snd_pcm_runtime *runtime = substream->runtime;
1498
1499         if (atomic_read(&substream->mmap_count))
1500                 return -ENXIO;
1501
1502         atomic_inc(&runtime->oss.rw_ref);
1503         while (bytes > 0) {
1504                 if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1505                         tmp = -ERESTARTSYS;
1506                         break;
1507                 }
1508                 tmp = snd_pcm_oss_make_ready_locked(substream);
1509                 if (tmp < 0)
1510                         goto err;
1511                 if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) {
1512                         if (runtime->oss.buffer_used == 0) {
1513                                 tmp = snd_pcm_oss_read2(substream, runtime->oss.buffer, runtime->oss.period_bytes, 1);
1514                                 if (tmp <= 0)
1515                                         goto err;
1516                                 runtime->oss.bytes += tmp;
1517                                 runtime->oss.period_ptr = tmp;
1518                                 runtime->oss.buffer_used = tmp;
1519                         }
1520                         tmp = bytes;
1521                         if ((size_t) tmp > runtime->oss.buffer_used)
1522                                 tmp = runtime->oss.buffer_used;
1523                         if (copy_to_user(buf, runtime->oss.buffer + (runtime->oss.period_ptr - runtime->oss.buffer_used), tmp)) {
1524                                 tmp = -EFAULT;
1525                                 goto err;
1526                         }
1527                         buf += tmp;
1528                         bytes -= tmp;
1529                         xfer += tmp;
1530                         runtime->oss.buffer_used -= tmp;
1531                 } else {
1532                         tmp = snd_pcm_oss_read2(substream, (char __force *)buf,
1533                                                 runtime->oss.period_bytes, 0);
1534                         if (tmp <= 0)
1535                                 goto err;
1536                         runtime->oss.bytes += tmp;
1537                         buf += tmp;
1538                         bytes -= tmp;
1539                         xfer += tmp;
1540                 }
1541  err:
1542                 mutex_unlock(&runtime->oss.params_lock);
1543                 if (tmp < 0)
1544                         break;
1545                 if (signal_pending(current)) {
1546                         tmp = -ERESTARTSYS;
1547                         break;
1548                 }
1549                 tmp = 0;
1550         }
1551         atomic_dec(&runtime->oss.rw_ref);
1552         return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
1553 }
1554
1555 static int snd_pcm_oss_reset(struct snd_pcm_oss_file *pcm_oss_file)
1556 {
1557         struct snd_pcm_substream *substream;
1558         struct snd_pcm_runtime *runtime;
1559         int i;
1560
1561         for (i = 0; i < 2; i++) {
1562                 substream = pcm_oss_file->streams[i];
1563                 if (!substream)
1564                         continue;
1565                 runtime = substream->runtime;
1566                 snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1567                 mutex_lock(&runtime->oss.params_lock);
1568                 runtime->oss.prepare = 1;
1569                 runtime->oss.buffer_used = 0;
1570                 runtime->oss.prev_hw_ptr_period = 0;
1571                 runtime->oss.period_ptr = 0;
1572                 mutex_unlock(&runtime->oss.params_lock);
1573         }
1574         return 0;
1575 }
1576
1577 static int snd_pcm_oss_post(struct snd_pcm_oss_file *pcm_oss_file)
1578 {
1579         struct snd_pcm_substream *substream;
1580         int err;
1581
1582         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
1583         if (substream != NULL) {
1584                 if ((err = snd_pcm_oss_make_ready(substream)) < 0)
1585                         return err;
1586                 snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_START, NULL);
1587         }
1588         /* note: all errors from the start action are ignored */
1589         /* OSS apps do not know, how to handle them */
1590         return 0;
1591 }
1592
1593 static int snd_pcm_oss_sync1(struct snd_pcm_substream *substream, size_t size)
1594 {
1595         struct snd_pcm_runtime *runtime;
1596         ssize_t result = 0;
1597         snd_pcm_state_t state;
1598         long res;
1599         wait_queue_entry_t wait;
1600
1601         runtime = substream->runtime;
1602         init_waitqueue_entry(&wait, current);
1603         add_wait_queue(&runtime->sleep, &wait);
1604 #ifdef OSS_DEBUG
1605         pcm_dbg(substream->pcm, "sync1: size = %li\n", size);
1606 #endif
1607         while (1) {
1608                 result = snd_pcm_oss_write2(substream, runtime->oss.buffer, size, 1);
1609                 if (result > 0) {
1610                         runtime->oss.buffer_used = 0;
1611                         result = 0;
1612                         break;
1613                 }
1614                 if (result != 0 && result != -EAGAIN)
1615                         break;
1616                 result = 0;
1617                 set_current_state(TASK_INTERRUPTIBLE);
1618                 snd_pcm_stream_lock_irq(substream);
1619                 state = runtime->status->state;
1620                 snd_pcm_stream_unlock_irq(substream);
1621                 if (state != SNDRV_PCM_STATE_RUNNING) {
1622                         set_current_state(TASK_RUNNING);
1623                         break;
1624                 }
1625                 res = schedule_timeout(10 * HZ);
1626                 if (signal_pending(current)) {
1627                         result = -ERESTARTSYS;
1628                         break;
1629                 }
1630                 if (res == 0) {
1631                         pcm_err(substream->pcm,
1632                                 "OSS sync error - DMA timeout\n");
1633                         result = -EIO;
1634                         break;
1635                 }
1636         }
1637         remove_wait_queue(&runtime->sleep, &wait);
1638         return result;
1639 }
1640
1641 static int snd_pcm_oss_sync(struct snd_pcm_oss_file *pcm_oss_file)
1642 {
1643         int err = 0;
1644         unsigned int saved_f_flags;
1645         struct snd_pcm_substream *substream;
1646         struct snd_pcm_runtime *runtime;
1647         snd_pcm_format_t format;
1648         unsigned long width;
1649         size_t size;
1650
1651         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
1652         if (substream != NULL) {
1653                 runtime = substream->runtime;
1654                 if (atomic_read(&substream->mmap_count))
1655                         goto __direct;
1656                 if ((err = snd_pcm_oss_make_ready(substream)) < 0)
1657                         return err;
1658                 atomic_inc(&runtime->oss.rw_ref);
1659                 if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1660                         atomic_dec(&runtime->oss.rw_ref);
1661                         return -ERESTARTSYS;
1662                 }
1663                 format = snd_pcm_oss_format_from(runtime->oss.format);
1664                 width = snd_pcm_format_physical_width(format);
1665                 if (runtime->oss.buffer_used > 0) {
1666 #ifdef OSS_DEBUG
1667                         pcm_dbg(substream->pcm, "sync: buffer_used\n");
1668 #endif
1669                         size = (8 * (runtime->oss.period_bytes - runtime->oss.buffer_used) + 7) / width;
1670                         snd_pcm_format_set_silence(format,
1671                                                    runtime->oss.buffer + runtime->oss.buffer_used,
1672                                                    size);
1673                         err = snd_pcm_oss_sync1(substream, runtime->oss.period_bytes);
1674                         if (err < 0)
1675                                 goto unlock;
1676                 } else if (runtime->oss.period_ptr > 0) {
1677 #ifdef OSS_DEBUG
1678                         pcm_dbg(substream->pcm, "sync: period_ptr\n");
1679 #endif
1680                         size = runtime->oss.period_bytes - runtime->oss.period_ptr;
1681                         snd_pcm_format_set_silence(format,
1682                                                    runtime->oss.buffer,
1683                                                    size * 8 / width);
1684                         err = snd_pcm_oss_sync1(substream, size);
1685                         if (err < 0)
1686                                 goto unlock;
1687                 }
1688                 /*
1689                  * The ALSA's period might be a bit large than OSS one.
1690                  * Fill the remain portion of ALSA period with zeros.
1691                  */
1692                 size = runtime->control->appl_ptr % runtime->period_size;
1693                 if (size > 0) {
1694                         size = runtime->period_size - size;
1695                         if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED)
1696                                 snd_pcm_lib_write(substream, NULL, size);
1697                         else if (runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
1698                                 snd_pcm_lib_writev(substream, NULL, size);
1699                 }
1700 unlock:
1701                 mutex_unlock(&runtime->oss.params_lock);
1702                 atomic_dec(&runtime->oss.rw_ref);
1703                 if (err < 0)
1704                         return err;
1705                 /*
1706                  * finish sync: drain the buffer
1707                  */
1708               __direct:
1709                 saved_f_flags = substream->f_flags;
1710                 substream->f_flags &= ~O_NONBLOCK;
1711                 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1712                 substream->f_flags = saved_f_flags;
1713                 if (err < 0)
1714                         return err;
1715                 mutex_lock(&runtime->oss.params_lock);
1716                 runtime->oss.prepare = 1;
1717                 mutex_unlock(&runtime->oss.params_lock);
1718         }
1719
1720         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
1721         if (substream != NULL) {
1722                 if ((err = snd_pcm_oss_make_ready(substream)) < 0)
1723                         return err;
1724                 runtime = substream->runtime;
1725                 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1726                 if (err < 0)
1727                         return err;
1728                 mutex_lock(&runtime->oss.params_lock);
1729                 runtime->oss.buffer_used = 0;
1730                 runtime->oss.prepare = 1;
1731                 mutex_unlock(&runtime->oss.params_lock);
1732         }
1733         return 0;
1734 }
1735
1736 static int snd_pcm_oss_set_rate(struct snd_pcm_oss_file *pcm_oss_file, int rate)
1737 {
1738         int idx;
1739
1740         for (idx = 1; idx >= 0; --idx) {
1741                 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1742                 struct snd_pcm_runtime *runtime;
1743                 int err;
1744
1745                 if (substream == NULL)
1746                         continue;
1747                 runtime = substream->runtime;
1748                 if (rate < 1000)
1749                         rate = 1000;
1750                 else if (rate > 192000)
1751                         rate = 192000;
1752                 err = lock_params(runtime);
1753                 if (err < 0)
1754                         return err;
1755                 if (runtime->oss.rate != rate) {
1756                         runtime->oss.params = 1;
1757                         runtime->oss.rate = rate;
1758                 }
1759                 unlock_params(runtime);
1760         }
1761         return snd_pcm_oss_get_rate(pcm_oss_file);
1762 }
1763
1764 static int snd_pcm_oss_get_rate(struct snd_pcm_oss_file *pcm_oss_file)
1765 {
1766         struct snd_pcm_substream *substream;
1767         int err;
1768
1769         if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1770                 return err;
1771         return substream->runtime->oss.rate;
1772 }
1773
1774 static int snd_pcm_oss_set_channels(struct snd_pcm_oss_file *pcm_oss_file, unsigned int channels)
1775 {
1776         int idx;
1777         if (channels < 1)
1778                 channels = 1;
1779         if (channels > 128)
1780                 return -EINVAL;
1781         for (idx = 1; idx >= 0; --idx) {
1782                 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1783                 struct snd_pcm_runtime *runtime;
1784                 int err;
1785
1786                 if (substream == NULL)
1787                         continue;
1788                 runtime = substream->runtime;
1789                 err = lock_params(runtime);
1790                 if (err < 0)
1791                         return err;
1792                 if (runtime->oss.channels != channels) {
1793                         runtime->oss.params = 1;
1794                         runtime->oss.channels = channels;
1795                 }
1796                 unlock_params(runtime);
1797         }
1798         return snd_pcm_oss_get_channels(pcm_oss_file);
1799 }
1800
1801 static int snd_pcm_oss_get_channels(struct snd_pcm_oss_file *pcm_oss_file)
1802 {
1803         struct snd_pcm_substream *substream;
1804         int err;
1805
1806         if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1807                 return err;
1808         return substream->runtime->oss.channels;
1809 }
1810
1811 static int snd_pcm_oss_get_block_size(struct snd_pcm_oss_file *pcm_oss_file)
1812 {
1813         struct snd_pcm_substream *substream;
1814         int err;
1815
1816         if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1817                 return err;
1818         return substream->runtime->oss.period_bytes;
1819 }
1820
1821 static int snd_pcm_oss_get_formats(struct snd_pcm_oss_file *pcm_oss_file)
1822 {
1823         struct snd_pcm_substream *substream;
1824         int err;
1825         int direct;
1826         struct snd_pcm_hw_params *params;
1827         unsigned int formats = 0;
1828         const struct snd_mask *format_mask;
1829         int fmt;
1830
1831         if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1832                 return err;
1833         if (atomic_read(&substream->mmap_count))
1834                 direct = 1;
1835         else
1836                 direct = substream->oss.setup.direct;
1837         if (!direct)
1838                 return AFMT_MU_LAW | AFMT_U8 |
1839                        AFMT_S16_LE | AFMT_S16_BE |
1840                        AFMT_S8 | AFMT_U16_LE |
1841                        AFMT_U16_BE |
1842                         AFMT_S32_LE | AFMT_S32_BE |
1843                         AFMT_S24_LE | AFMT_S24_BE |
1844                         AFMT_S24_PACKED;
1845         params = kmalloc(sizeof(*params), GFP_KERNEL);
1846         if (!params)
1847                 return -ENOMEM;
1848         _snd_pcm_hw_params_any(params);
1849         err = snd_pcm_hw_refine(substream, params);
1850         if (err < 0)
1851                 goto error;
1852         format_mask = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
1853         for (fmt = 0; fmt < 32; ++fmt) {
1854                 if (snd_mask_test(format_mask, fmt)) {
1855                         int f = snd_pcm_oss_format_to((__force snd_pcm_format_t)fmt);
1856                         if (f >= 0)
1857                                 formats |= f;
1858                 }
1859         }
1860
1861  error:
1862         kfree(params);
1863         return err < 0 ? err : formats;
1864 }
1865
1866 static int snd_pcm_oss_set_format(struct snd_pcm_oss_file *pcm_oss_file, int format)
1867 {
1868         int formats, idx;
1869         int err;
1870
1871         if (format != AFMT_QUERY) {
1872                 formats = snd_pcm_oss_get_formats(pcm_oss_file);
1873                 if (formats < 0)
1874                         return formats;
1875                 if (!(formats & format))
1876                         format = AFMT_U8;
1877                 for (idx = 1; idx >= 0; --idx) {
1878                         struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1879                         struct snd_pcm_runtime *runtime;
1880                         if (substream == NULL)
1881                                 continue;
1882                         runtime = substream->runtime;
1883                         err = lock_params(runtime);
1884                         if (err < 0)
1885                                 return err;
1886                         if (runtime->oss.format != format) {
1887                                 runtime->oss.params = 1;
1888                                 runtime->oss.format = format;
1889                         }
1890                         unlock_params(runtime);
1891                 }
1892         }
1893         return snd_pcm_oss_get_format(pcm_oss_file);
1894 }
1895
1896 static int snd_pcm_oss_get_format(struct snd_pcm_oss_file *pcm_oss_file)
1897 {
1898         struct snd_pcm_substream *substream;
1899         int err;
1900
1901         if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1902                 return err;
1903         return substream->runtime->oss.format;
1904 }
1905
1906 static int snd_pcm_oss_set_subdivide1(struct snd_pcm_substream *substream, int subdivide)
1907 {
1908         struct snd_pcm_runtime *runtime;
1909
1910         runtime = substream->runtime;
1911         if (subdivide == 0) {
1912                 subdivide = runtime->oss.subdivision;
1913                 if (subdivide == 0)
1914                         subdivide = 1;
1915                 return subdivide;
1916         }
1917         if (runtime->oss.subdivision || runtime->oss.fragshift)
1918                 return -EINVAL;
1919         if (subdivide != 1 && subdivide != 2 && subdivide != 4 &&
1920             subdivide != 8 && subdivide != 16)
1921                 return -EINVAL;
1922         runtime->oss.subdivision = subdivide;
1923         runtime->oss.params = 1;
1924         return subdivide;
1925 }
1926
1927 static int snd_pcm_oss_set_subdivide(struct snd_pcm_oss_file *pcm_oss_file, int subdivide)
1928 {
1929         int err = -EINVAL, idx;
1930
1931         for (idx = 1; idx >= 0; --idx) {
1932                 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1933                 struct snd_pcm_runtime *runtime;
1934
1935                 if (substream == NULL)
1936                         continue;
1937                 runtime = substream->runtime;
1938                 err = lock_params(runtime);
1939                 if (err < 0)
1940                         return err;
1941                 err = snd_pcm_oss_set_subdivide1(substream, subdivide);
1942                 unlock_params(runtime);
1943                 if (err < 0)
1944                         return err;
1945         }
1946         return err;
1947 }
1948
1949 static int snd_pcm_oss_set_fragment1(struct snd_pcm_substream *substream, unsigned int val)
1950 {
1951         struct snd_pcm_runtime *runtime;
1952
1953         runtime = substream->runtime;
1954         if (runtime->oss.subdivision || runtime->oss.fragshift)
1955                 return -EINVAL;
1956         runtime->oss.fragshift = val & 0xffff;
1957         runtime->oss.maxfrags = (val >> 16) & 0xffff;
1958         if (runtime->oss.fragshift < 4)         /* < 16 */
1959                 runtime->oss.fragshift = 4;
1960         if (runtime->oss.maxfrags < 2)
1961                 runtime->oss.maxfrags = 2;
1962         runtime->oss.params = 1;
1963         return 0;
1964 }
1965
1966 static int snd_pcm_oss_set_fragment(struct snd_pcm_oss_file *pcm_oss_file, unsigned int val)
1967 {
1968         int err = -EINVAL, idx;
1969
1970         for (idx = 1; idx >= 0; --idx) {
1971                 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1972                 struct snd_pcm_runtime *runtime;
1973
1974                 if (substream == NULL)
1975                         continue;
1976                 runtime = substream->runtime;
1977                 err = lock_params(runtime);
1978                 if (err < 0)
1979                         return err;
1980                 err = snd_pcm_oss_set_fragment1(substream, val);
1981                 unlock_params(runtime);
1982                 if (err < 0)
1983                         return err;
1984         }
1985         return err;
1986 }
1987
1988 static int snd_pcm_oss_nonblock(struct file * file)
1989 {
1990         spin_lock(&file->f_lock);
1991         file->f_flags |= O_NONBLOCK;
1992         spin_unlock(&file->f_lock);
1993         return 0;
1994 }
1995
1996 static int snd_pcm_oss_get_caps1(struct snd_pcm_substream *substream, int res)
1997 {
1998
1999         if (substream == NULL) {
2000                 res &= ~DSP_CAP_DUPLEX;
2001                 return res;
2002         }
2003 #ifdef DSP_CAP_MULTI
2004         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2005                 if (substream->pstr->substream_count > 1)
2006                         res |= DSP_CAP_MULTI;
2007 #endif
2008         /* DSP_CAP_REALTIME is set all times: */
2009         /* all ALSA drivers can return actual pointer in ring buffer */
2010 #if defined(DSP_CAP_REALTIME) && 0
2011         {
2012                 struct snd_pcm_runtime *runtime = substream->runtime;
2013                 if (runtime->info & (SNDRV_PCM_INFO_BLOCK_TRANSFER|SNDRV_PCM_INFO_BATCH))
2014                         res &= ~DSP_CAP_REALTIME;
2015         }
2016 #endif
2017         return res;
2018 }
2019
2020 static int snd_pcm_oss_get_caps(struct snd_pcm_oss_file *pcm_oss_file)
2021 {
2022         int result, idx;
2023
2024         result = DSP_CAP_TRIGGER | DSP_CAP_MMAP | DSP_CAP_DUPLEX | DSP_CAP_REALTIME;
2025         for (idx = 0; idx < 2; idx++) {
2026                 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
2027                 result = snd_pcm_oss_get_caps1(substream, result);
2028         }
2029         result |= 0x0001;       /* revision - same as SB AWE 64 */
2030         return result;
2031 }
2032
2033 static void snd_pcm_oss_simulate_fill(struct snd_pcm_substream *substream,
2034                                       snd_pcm_uframes_t hw_ptr)
2035 {
2036         struct snd_pcm_runtime *runtime = substream->runtime;
2037         snd_pcm_uframes_t appl_ptr;
2038         appl_ptr = hw_ptr + runtime->buffer_size;
2039         appl_ptr %= runtime->boundary;
2040         runtime->control->appl_ptr = appl_ptr;
2041 }
2042
2043 static int snd_pcm_oss_set_trigger(struct snd_pcm_oss_file *pcm_oss_file, int trigger)
2044 {
2045         struct snd_pcm_runtime *runtime;
2046         struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2047         int err, cmd;
2048
2049 #ifdef OSS_DEBUG
2050         pcm_dbg(substream->pcm, "pcm_oss: trigger = 0x%x\n", trigger);
2051 #endif
2052
2053         psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2054         csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2055
2056         if (psubstream) {
2057                 if ((err = snd_pcm_oss_make_ready(psubstream)) < 0)
2058                         return err;
2059         }
2060         if (csubstream) {
2061                 if ((err = snd_pcm_oss_make_ready(csubstream)) < 0)
2062                         return err;
2063         }
2064         if (psubstream) {
2065                 runtime = psubstream->runtime;
2066                 cmd = 0;
2067                 if (mutex_lock_interruptible(&runtime->oss.params_lock))
2068                         return -ERESTARTSYS;
2069                 if (trigger & PCM_ENABLE_OUTPUT) {
2070                         if (runtime->oss.trigger)
2071                                 goto _skip1;
2072                         if (atomic_read(&psubstream->mmap_count))
2073                                 snd_pcm_oss_simulate_fill(psubstream,
2074                                                 get_hw_ptr_period(runtime));
2075                         runtime->oss.trigger = 1;
2076                         runtime->start_threshold = 1;
2077                         cmd = SNDRV_PCM_IOCTL_START;
2078                 } else {
2079                         if (!runtime->oss.trigger)
2080                                 goto _skip1;
2081                         runtime->oss.trigger = 0;
2082                         runtime->start_threshold = runtime->boundary;
2083                         cmd = SNDRV_PCM_IOCTL_DROP;
2084                         runtime->oss.prepare = 1;
2085                 }
2086  _skip1:
2087                 mutex_unlock(&runtime->oss.params_lock);
2088                 if (cmd) {
2089                         err = snd_pcm_kernel_ioctl(psubstream, cmd, NULL);
2090                         if (err < 0)
2091                                 return err;
2092                 }
2093         }
2094         if (csubstream) {
2095                 runtime = csubstream->runtime;
2096                 cmd = 0;
2097                 if (mutex_lock_interruptible(&runtime->oss.params_lock))
2098                         return -ERESTARTSYS;
2099                 if (trigger & PCM_ENABLE_INPUT) {
2100                         if (runtime->oss.trigger)
2101                                 goto _skip2;
2102                         runtime->oss.trigger = 1;
2103                         runtime->start_threshold = 1;
2104                         cmd = SNDRV_PCM_IOCTL_START;
2105                 } else {
2106                         if (!runtime->oss.trigger)
2107                                 goto _skip2;
2108                         runtime->oss.trigger = 0;
2109                         runtime->start_threshold = runtime->boundary;
2110                         cmd = SNDRV_PCM_IOCTL_DROP;
2111                         runtime->oss.prepare = 1;
2112                 }
2113  _skip2:
2114                 mutex_unlock(&runtime->oss.params_lock);
2115                 if (cmd) {
2116                         err = snd_pcm_kernel_ioctl(csubstream, cmd, NULL);
2117                         if (err < 0)
2118                                 return err;
2119                 }
2120         }
2121         return 0;
2122 }
2123
2124 static int snd_pcm_oss_get_trigger(struct snd_pcm_oss_file *pcm_oss_file)
2125 {
2126         struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2127         int result = 0;
2128
2129         psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2130         csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2131         if (psubstream && psubstream->runtime && psubstream->runtime->oss.trigger)
2132                 result |= PCM_ENABLE_OUTPUT;
2133         if (csubstream && csubstream->runtime && csubstream->runtime->oss.trigger)
2134                 result |= PCM_ENABLE_INPUT;
2135         return result;
2136 }
2137
2138 static int snd_pcm_oss_get_odelay(struct snd_pcm_oss_file *pcm_oss_file)
2139 {
2140         struct snd_pcm_substream *substream;
2141         struct snd_pcm_runtime *runtime;
2142         snd_pcm_sframes_t delay;
2143         int err;
2144
2145         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2146         if (substream == NULL)
2147                 return -EINVAL;
2148         if ((err = snd_pcm_oss_make_ready(substream)) < 0)
2149                 return err;
2150         runtime = substream->runtime;
2151         if (runtime->oss.params || runtime->oss.prepare)
2152                 return 0;
2153         err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &delay);
2154         if (err == -EPIPE)
2155                 delay = 0;      /* hack for broken OSS applications */
2156         else if (err < 0)
2157                 return err;
2158         return snd_pcm_oss_bytes(substream, delay);
2159 }
2160
2161 static int snd_pcm_oss_get_ptr(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct count_info __user * _info)
2162 {
2163         struct snd_pcm_substream *substream;
2164         struct snd_pcm_runtime *runtime;
2165         snd_pcm_sframes_t delay;
2166         int fixup;
2167         struct count_info info;
2168         int err;
2169
2170         if (_info == NULL)
2171                 return -EFAULT;
2172         substream = pcm_oss_file->streams[stream];
2173         if (substream == NULL)
2174                 return -EINVAL;
2175         if ((err = snd_pcm_oss_make_ready(substream)) < 0)
2176                 return err;
2177         runtime = substream->runtime;
2178         if (runtime->oss.params || runtime->oss.prepare) {
2179                 memset(&info, 0, sizeof(info));
2180                 if (copy_to_user(_info, &info, sizeof(info)))
2181                         return -EFAULT;
2182                 return 0;
2183         }
2184         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2185                 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &delay);
2186                 if (err == -EPIPE || err == -ESTRPIPE || (! err && delay < 0)) {
2187                         err = 0;
2188                         delay = 0;
2189                         fixup = 0;
2190                 } else {
2191                         fixup = runtime->oss.buffer_used;
2192                 }
2193         } else {
2194                 err = snd_pcm_oss_capture_position_fixup(substream, &delay);
2195                 fixup = -runtime->oss.buffer_used;
2196         }
2197         if (err < 0)
2198                 return err;
2199         info.ptr = snd_pcm_oss_bytes(substream, runtime->status->hw_ptr % runtime->buffer_size);
2200         if (atomic_read(&substream->mmap_count)) {
2201                 snd_pcm_sframes_t n;
2202                 delay = get_hw_ptr_period(runtime);
2203                 n = delay - runtime->oss.prev_hw_ptr_period;
2204                 if (n < 0)
2205                         n += runtime->boundary;
2206                 info.blocks = n / runtime->period_size;
2207                 runtime->oss.prev_hw_ptr_period = delay;
2208                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2209                         snd_pcm_oss_simulate_fill(substream, delay);
2210                 info.bytes = snd_pcm_oss_bytes(substream, runtime->status->hw_ptr) & INT_MAX;
2211         } else {
2212                 delay = snd_pcm_oss_bytes(substream, delay);
2213                 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2214                         if (substream->oss.setup.buggyptr)
2215                                 info.blocks = (runtime->oss.buffer_bytes - delay - fixup) / runtime->oss.period_bytes;
2216                         else
2217                                 info.blocks = (delay + fixup) / runtime->oss.period_bytes;
2218                         info.bytes = (runtime->oss.bytes - delay) & INT_MAX;
2219                 } else {
2220                         delay += fixup;
2221                         info.blocks = delay / runtime->oss.period_bytes;
2222                         info.bytes = (runtime->oss.bytes + delay) & INT_MAX;
2223                 }
2224         }
2225         if (copy_to_user(_info, &info, sizeof(info)))
2226                 return -EFAULT;
2227         return 0;
2228 }
2229
2230 static int snd_pcm_oss_get_space(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct audio_buf_info __user *_info)
2231 {
2232         struct snd_pcm_substream *substream;
2233         struct snd_pcm_runtime *runtime;
2234         snd_pcm_sframes_t avail;
2235         int fixup;
2236         struct audio_buf_info info;
2237         int err;
2238
2239         if (_info == NULL)
2240                 return -EFAULT;
2241         substream = pcm_oss_file->streams[stream];
2242         if (substream == NULL)
2243                 return -EINVAL;
2244         runtime = substream->runtime;
2245
2246         if (runtime->oss.params &&
2247             (err = snd_pcm_oss_change_params(substream, false)) < 0)
2248                 return err;
2249
2250         info.fragsize = runtime->oss.period_bytes;
2251         info.fragstotal = runtime->periods;
2252         if (runtime->oss.prepare) {
2253                 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2254                         info.bytes = runtime->oss.period_bytes * runtime->oss.periods;
2255                         info.fragments = runtime->oss.periods;
2256                 } else {
2257                         info.bytes = 0;
2258                         info.fragments = 0;
2259                 }
2260         } else {
2261                 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2262                         err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &avail);
2263                         if (err == -EPIPE || err == -ESTRPIPE || (! err && avail < 0)) {
2264                                 avail = runtime->buffer_size;
2265                                 err = 0;
2266                                 fixup = 0;
2267                         } else {
2268                                 avail = runtime->buffer_size - avail;
2269                                 fixup = -runtime->oss.buffer_used;
2270                         }
2271                 } else {
2272                         err = snd_pcm_oss_capture_position_fixup(substream, &avail);
2273                         fixup = runtime->oss.buffer_used;
2274                 }
2275                 if (err < 0)
2276                         return err;
2277                 info.bytes = snd_pcm_oss_bytes(substream, avail) + fixup;
2278                 info.fragments = info.bytes / runtime->oss.period_bytes;
2279         }
2280
2281 #ifdef OSS_DEBUG
2282         pcm_dbg(substream->pcm,
2283                 "pcm_oss: space: bytes = %i, fragments = %i, fragstotal = %i, fragsize = %i\n",
2284                 info.bytes, info.fragments, info.fragstotal, info.fragsize);
2285 #endif
2286         if (copy_to_user(_info, &info, sizeof(info)))
2287                 return -EFAULT;
2288         return 0;
2289 }
2290
2291 static int snd_pcm_oss_get_mapbuf(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct buffmem_desc __user * _info)
2292 {
2293         // it won't be probably implemented
2294         // pr_debug("TODO: snd_pcm_oss_get_mapbuf\n");
2295         return -EINVAL;
2296 }
2297
2298 static const char *strip_task_path(const char *path)
2299 {
2300         const char *ptr, *ptrl = NULL;
2301         for (ptr = path; *ptr; ptr++) {
2302                 if (*ptr == '/')
2303                         ptrl = ptr + 1;
2304         }
2305         return ptrl;
2306 }
2307
2308 static void snd_pcm_oss_look_for_setup(struct snd_pcm *pcm, int stream,
2309                                       const char *task_name,
2310                                       struct snd_pcm_oss_setup *rsetup)
2311 {
2312         struct snd_pcm_oss_setup *setup;
2313
2314         mutex_lock(&pcm->streams[stream].oss.setup_mutex);
2315         do {
2316                 for (setup = pcm->streams[stream].oss.setup_list; setup;
2317                      setup = setup->next) {
2318                         if (!strcmp(setup->task_name, task_name))
2319                                 goto out;
2320                 }
2321         } while ((task_name = strip_task_path(task_name)) != NULL);
2322  out:
2323         if (setup)
2324                 *rsetup = *setup;
2325         mutex_unlock(&pcm->streams[stream].oss.setup_mutex);
2326 }
2327
2328 static void snd_pcm_oss_release_substream(struct snd_pcm_substream *substream)
2329 {
2330         struct snd_pcm_runtime *runtime;
2331         runtime = substream->runtime;
2332         kvfree(runtime->oss.buffer);
2333         runtime->oss.buffer = NULL;
2334 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
2335         snd_pcm_oss_plugin_clear(substream);
2336 #endif
2337         substream->oss.oss = 0;
2338 }
2339
2340 static void snd_pcm_oss_init_substream(struct snd_pcm_substream *substream,
2341                                        struct snd_pcm_oss_setup *setup,
2342                                        int minor)
2343 {
2344         struct snd_pcm_runtime *runtime;
2345
2346         substream->oss.oss = 1;
2347         substream->oss.setup = *setup;
2348         if (setup->nonblock)
2349                 substream->f_flags |= O_NONBLOCK;
2350         else if (setup->block)
2351                 substream->f_flags &= ~O_NONBLOCK;
2352         runtime = substream->runtime;
2353         runtime->oss.params = 1;
2354         runtime->oss.trigger = 1;
2355         runtime->oss.rate = 8000;
2356         mutex_init(&runtime->oss.params_lock);
2357         switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
2358         case SNDRV_MINOR_OSS_PCM_8:
2359                 runtime->oss.format = AFMT_U8;
2360                 break;
2361         case SNDRV_MINOR_OSS_PCM_16:
2362                 runtime->oss.format = AFMT_S16_LE;
2363                 break;
2364         default:
2365                 runtime->oss.format = AFMT_MU_LAW;
2366         }
2367         runtime->oss.channels = 1;
2368         runtime->oss.fragshift = 0;
2369         runtime->oss.maxfrags = 0;
2370         runtime->oss.subdivision = 0;
2371         substream->pcm_release = snd_pcm_oss_release_substream;
2372         atomic_set(&runtime->oss.rw_ref, 0);
2373 }
2374
2375 static int snd_pcm_oss_release_file(struct snd_pcm_oss_file *pcm_oss_file)
2376 {
2377         int cidx;
2378         if (!pcm_oss_file)
2379                 return 0;
2380         for (cidx = 0; cidx < 2; ++cidx) {
2381                 struct snd_pcm_substream *substream = pcm_oss_file->streams[cidx];
2382                 if (substream)
2383                         snd_pcm_release_substream(substream);
2384         }
2385         kfree(pcm_oss_file);
2386         return 0;
2387 }
2388
2389 static int snd_pcm_oss_open_file(struct file *file,
2390                                  struct snd_pcm *pcm,
2391                                  struct snd_pcm_oss_file **rpcm_oss_file,
2392                                  int minor,
2393                                  struct snd_pcm_oss_setup *setup)
2394 {
2395         int idx, err;
2396         struct snd_pcm_oss_file *pcm_oss_file;
2397         struct snd_pcm_substream *substream;
2398         fmode_t f_mode = file->f_mode;
2399
2400         if (rpcm_oss_file)
2401                 *rpcm_oss_file = NULL;
2402
2403         pcm_oss_file = kzalloc(sizeof(*pcm_oss_file), GFP_KERNEL);
2404         if (pcm_oss_file == NULL)
2405                 return -ENOMEM;
2406
2407         if ((f_mode & (FMODE_WRITE|FMODE_READ)) == (FMODE_WRITE|FMODE_READ) &&
2408             (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX))
2409                 f_mode = FMODE_WRITE;
2410
2411         file->f_flags &= ~O_APPEND;
2412         for (idx = 0; idx < 2; idx++) {
2413                 if (setup[idx].disable)
2414                         continue;
2415                 if (! pcm->streams[idx].substream_count)
2416                         continue; /* no matching substream */
2417                 if (idx == SNDRV_PCM_STREAM_PLAYBACK) {
2418                         if (! (f_mode & FMODE_WRITE))
2419                                 continue;
2420                 } else {
2421                         if (! (f_mode & FMODE_READ))
2422                                 continue;
2423                 }
2424                 err = snd_pcm_open_substream(pcm, idx, file, &substream);
2425                 if (err < 0) {
2426                         snd_pcm_oss_release_file(pcm_oss_file);
2427                         return err;
2428                 }
2429
2430                 pcm_oss_file->streams[idx] = substream;
2431                 snd_pcm_oss_init_substream(substream, &setup[idx], minor);
2432         }
2433
2434         if (!pcm_oss_file->streams[0] && !pcm_oss_file->streams[1]) {
2435                 snd_pcm_oss_release_file(pcm_oss_file);
2436                 return -EINVAL;
2437         }
2438
2439         file->private_data = pcm_oss_file;
2440         if (rpcm_oss_file)
2441                 *rpcm_oss_file = pcm_oss_file;
2442         return 0;
2443 }
2444
2445
2446 static int snd_task_name(struct task_struct *task, char *name, size_t size)
2447 {
2448         unsigned int idx;
2449
2450         if (snd_BUG_ON(!task || !name || size < 2))
2451                 return -EINVAL;
2452         for (idx = 0; idx < sizeof(task->comm) && idx + 1 < size; idx++)
2453                 name[idx] = task->comm[idx];
2454         name[idx] = '\0';
2455         return 0;
2456 }
2457
2458 static int snd_pcm_oss_open(struct inode *inode, struct file *file)
2459 {
2460         int err;
2461         char task_name[32];
2462         struct snd_pcm *pcm;
2463         struct snd_pcm_oss_file *pcm_oss_file;
2464         struct snd_pcm_oss_setup setup[2];
2465         int nonblock;
2466         wait_queue_entry_t wait;
2467
2468         err = nonseekable_open(inode, file);
2469         if (err < 0)
2470                 return err;
2471
2472         pcm = snd_lookup_oss_minor_data(iminor(inode),
2473                                         SNDRV_OSS_DEVICE_TYPE_PCM);
2474         if (pcm == NULL) {
2475                 err = -ENODEV;
2476                 goto __error1;
2477         }
2478         err = snd_card_file_add(pcm->card, file);
2479         if (err < 0)
2480                 goto __error1;
2481         if (!try_module_get(pcm->card->module)) {
2482                 err = -EFAULT;
2483                 goto __error2;
2484         }
2485         if (snd_task_name(current, task_name, sizeof(task_name)) < 0) {
2486                 err = -EFAULT;
2487                 goto __error;
2488         }
2489         memset(setup, 0, sizeof(setup));
2490         if (file->f_mode & FMODE_WRITE)
2491                 snd_pcm_oss_look_for_setup(pcm, SNDRV_PCM_STREAM_PLAYBACK,
2492                                            task_name, &setup[0]);
2493         if (file->f_mode & FMODE_READ)
2494                 snd_pcm_oss_look_for_setup(pcm, SNDRV_PCM_STREAM_CAPTURE,
2495                                            task_name, &setup[1]);
2496
2497         nonblock = !!(file->f_flags & O_NONBLOCK);
2498         if (!nonblock)
2499                 nonblock = nonblock_open;
2500
2501         init_waitqueue_entry(&wait, current);
2502         add_wait_queue(&pcm->open_wait, &wait);
2503         mutex_lock(&pcm->open_mutex);
2504         while (1) {
2505                 err = snd_pcm_oss_open_file(file, pcm, &pcm_oss_file,
2506                                             iminor(inode), setup);
2507                 if (err >= 0)
2508                         break;
2509                 if (err == -EAGAIN) {
2510                         if (nonblock) {
2511                                 err = -EBUSY;
2512                                 break;
2513                         }
2514                 } else
2515                         break;
2516                 set_current_state(TASK_INTERRUPTIBLE);
2517                 mutex_unlock(&pcm->open_mutex);
2518                 schedule();
2519                 mutex_lock(&pcm->open_mutex);
2520                 if (pcm->card->shutdown) {
2521                         err = -ENODEV;
2522                         break;
2523                 }
2524                 if (signal_pending(current)) {
2525                         err = -ERESTARTSYS;
2526                         break;
2527                 }
2528         }
2529         remove_wait_queue(&pcm->open_wait, &wait);
2530         mutex_unlock(&pcm->open_mutex);
2531         if (err < 0)
2532                 goto __error;
2533         snd_card_unref(pcm->card);
2534         return err;
2535
2536       __error:
2537         module_put(pcm->card->module);
2538       __error2:
2539         snd_card_file_remove(pcm->card, file);
2540       __error1:
2541         if (pcm)
2542                 snd_card_unref(pcm->card);
2543         return err;
2544 }
2545
2546 static int snd_pcm_oss_release(struct inode *inode, struct file *file)
2547 {
2548         struct snd_pcm *pcm;
2549         struct snd_pcm_substream *substream;
2550         struct snd_pcm_oss_file *pcm_oss_file;
2551
2552         pcm_oss_file = file->private_data;
2553         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2554         if (substream == NULL)
2555                 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2556         if (snd_BUG_ON(!substream))
2557                 return -ENXIO;
2558         pcm = substream->pcm;
2559         if (!pcm->card->shutdown)
2560                 snd_pcm_oss_sync(pcm_oss_file);
2561         mutex_lock(&pcm->open_mutex);
2562         snd_pcm_oss_release_file(pcm_oss_file);
2563         mutex_unlock(&pcm->open_mutex);
2564         wake_up(&pcm->open_wait);
2565         module_put(pcm->card->module);
2566         snd_card_file_remove(pcm->card, file);
2567         return 0;
2568 }
2569
2570 static long snd_pcm_oss_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2571 {
2572         struct snd_pcm_oss_file *pcm_oss_file;
2573         int __user *p = (int __user *)arg;
2574         int res;
2575
2576         pcm_oss_file = file->private_data;
2577         if (cmd == OSS_GETVERSION)
2578                 return put_user(SNDRV_OSS_VERSION, p);
2579         if (cmd == OSS_ALSAEMULVER)
2580                 return put_user(1, p);
2581 #if IS_REACHABLE(CONFIG_SND_MIXER_OSS)
2582         if (((cmd >> 8) & 0xff) == 'M') {       /* mixer ioctl - for OSS compatibility */
2583                 struct snd_pcm_substream *substream;
2584                 int idx;
2585                 for (idx = 0; idx < 2; ++idx) {
2586                         substream = pcm_oss_file->streams[idx];
2587                         if (substream != NULL)
2588                                 break;
2589                 }
2590                 if (snd_BUG_ON(idx >= 2))
2591                         return -ENXIO;
2592                 return snd_mixer_oss_ioctl_card(substream->pcm->card, cmd, arg);
2593         }
2594 #endif
2595         if (((cmd >> 8) & 0xff) != 'P')
2596                 return -EINVAL;
2597 #ifdef OSS_DEBUG
2598         pr_debug("pcm_oss: ioctl = 0x%x\n", cmd);
2599 #endif
2600         switch (cmd) {
2601         case SNDCTL_DSP_RESET:
2602                 return snd_pcm_oss_reset(pcm_oss_file);
2603         case SNDCTL_DSP_SYNC:
2604                 return snd_pcm_oss_sync(pcm_oss_file);
2605         case SNDCTL_DSP_SPEED:
2606                 if (get_user(res, p))
2607                         return -EFAULT;
2608                 if ((res = snd_pcm_oss_set_rate(pcm_oss_file, res))<0)
2609                         return res;
2610                 return put_user(res, p);
2611         case SOUND_PCM_READ_RATE:
2612                 res = snd_pcm_oss_get_rate(pcm_oss_file);
2613                 if (res < 0)
2614                         return res;
2615                 return put_user(res, p);
2616         case SNDCTL_DSP_STEREO:
2617                 if (get_user(res, p))
2618                         return -EFAULT;
2619                 res = res > 0 ? 2 : 1;
2620                 if ((res = snd_pcm_oss_set_channels(pcm_oss_file, res)) < 0)
2621                         return res;
2622                 return put_user(--res, p);
2623         case SNDCTL_DSP_GETBLKSIZE:
2624                 res = snd_pcm_oss_get_block_size(pcm_oss_file);
2625                 if (res < 0)
2626                         return res;
2627                 return put_user(res, p);
2628         case SNDCTL_DSP_SETFMT:
2629                 if (get_user(res, p))
2630                         return -EFAULT;
2631                 res = snd_pcm_oss_set_format(pcm_oss_file, res);
2632                 if (res < 0)
2633                         return res;
2634                 return put_user(res, p);
2635         case SOUND_PCM_READ_BITS:
2636                 res = snd_pcm_oss_get_format(pcm_oss_file);
2637                 if (res < 0)
2638                         return res;
2639                 return put_user(res, p);
2640         case SNDCTL_DSP_CHANNELS:
2641                 if (get_user(res, p))
2642                         return -EFAULT;
2643                 res = snd_pcm_oss_set_channels(pcm_oss_file, res);
2644                 if (res < 0)
2645                         return res;
2646                 return put_user(res, p);
2647         case SOUND_PCM_READ_CHANNELS:
2648                 res = snd_pcm_oss_get_channels(pcm_oss_file);
2649                 if (res < 0)
2650                         return res;
2651                 return put_user(res, p);
2652         case SOUND_PCM_WRITE_FILTER:
2653         case SOUND_PCM_READ_FILTER:
2654                 return -EIO;
2655         case SNDCTL_DSP_POST:
2656                 return snd_pcm_oss_post(pcm_oss_file);
2657         case SNDCTL_DSP_SUBDIVIDE:
2658                 if (get_user(res, p))
2659                         return -EFAULT;
2660                 res = snd_pcm_oss_set_subdivide(pcm_oss_file, res);
2661                 if (res < 0)
2662                         return res;
2663                 return put_user(res, p);
2664         case SNDCTL_DSP_SETFRAGMENT:
2665                 if (get_user(res, p))
2666                         return -EFAULT;
2667                 return snd_pcm_oss_set_fragment(pcm_oss_file, res);
2668         case SNDCTL_DSP_GETFMTS:
2669                 res = snd_pcm_oss_get_formats(pcm_oss_file);
2670                 if (res < 0)
2671                         return res;
2672                 return put_user(res, p);
2673         case SNDCTL_DSP_GETOSPACE:
2674         case SNDCTL_DSP_GETISPACE:
2675                 return snd_pcm_oss_get_space(pcm_oss_file,
2676                         cmd == SNDCTL_DSP_GETISPACE ?
2677                                 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2678                         (struct audio_buf_info __user *) arg);
2679         case SNDCTL_DSP_NONBLOCK:
2680                 return snd_pcm_oss_nonblock(file);
2681         case SNDCTL_DSP_GETCAPS:
2682                 res = snd_pcm_oss_get_caps(pcm_oss_file);
2683                 if (res < 0)
2684                         return res;
2685                 return put_user(res, p);
2686         case SNDCTL_DSP_GETTRIGGER:
2687                 res = snd_pcm_oss_get_trigger(pcm_oss_file);
2688                 if (res < 0)
2689                         return res;
2690                 return put_user(res, p);
2691         case SNDCTL_DSP_SETTRIGGER:
2692                 if (get_user(res, p))
2693                         return -EFAULT;
2694                 return snd_pcm_oss_set_trigger(pcm_oss_file, res);
2695         case SNDCTL_DSP_GETIPTR:
2696         case SNDCTL_DSP_GETOPTR:
2697                 return snd_pcm_oss_get_ptr(pcm_oss_file,
2698                         cmd == SNDCTL_DSP_GETIPTR ?
2699                                 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2700                         (struct count_info __user *) arg);
2701         case SNDCTL_DSP_MAPINBUF:
2702         case SNDCTL_DSP_MAPOUTBUF:
2703                 return snd_pcm_oss_get_mapbuf(pcm_oss_file,
2704                         cmd == SNDCTL_DSP_MAPINBUF ?
2705                                 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2706                         (struct buffmem_desc __user *) arg);
2707         case SNDCTL_DSP_SETSYNCRO:
2708                 /* stop DMA now.. */
2709                 return 0;
2710         case SNDCTL_DSP_SETDUPLEX:
2711                 if (snd_pcm_oss_get_caps(pcm_oss_file) & DSP_CAP_DUPLEX)
2712                         return 0;
2713                 return -EIO;
2714         case SNDCTL_DSP_GETODELAY:
2715                 res = snd_pcm_oss_get_odelay(pcm_oss_file);
2716                 if (res < 0) {
2717                         /* it's for sure, some broken apps don't check for error codes */
2718                         put_user(0, p);
2719                         return res;
2720                 }
2721                 return put_user(res, p);
2722         case SNDCTL_DSP_PROFILE:
2723                 return 0;       /* silently ignore */
2724         default:
2725                 pr_debug("pcm_oss: unknown command = 0x%x\n", cmd);
2726         }
2727         return -EINVAL;
2728 }
2729
2730 #ifdef CONFIG_COMPAT
2731 /* all compatible */
2732 static long snd_pcm_oss_ioctl_compat(struct file *file, unsigned int cmd,
2733                                      unsigned long arg)
2734 {
2735         return snd_pcm_oss_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
2736 }
2737 #else
2738 #define snd_pcm_oss_ioctl_compat        NULL
2739 #endif
2740
2741 static ssize_t snd_pcm_oss_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
2742 {
2743         struct snd_pcm_oss_file *pcm_oss_file;
2744         struct snd_pcm_substream *substream;
2745
2746         pcm_oss_file = file->private_data;
2747         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2748         if (substream == NULL)
2749                 return -ENXIO;
2750         substream->f_flags = file->f_flags & O_NONBLOCK;
2751 #ifndef OSS_DEBUG
2752         return snd_pcm_oss_read1(substream, buf, count);
2753 #else
2754         {
2755                 ssize_t res = snd_pcm_oss_read1(substream, buf, count);
2756                 pcm_dbg(substream->pcm,
2757                         "pcm_oss: read %li bytes (returned %li bytes)\n",
2758                         (long)count, (long)res);
2759                 return res;
2760         }
2761 #endif
2762 }
2763
2764 static ssize_t snd_pcm_oss_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
2765 {
2766         struct snd_pcm_oss_file *pcm_oss_file;
2767         struct snd_pcm_substream *substream;
2768         long result;
2769
2770         pcm_oss_file = file->private_data;
2771         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2772         if (substream == NULL)
2773                 return -ENXIO;
2774         substream->f_flags = file->f_flags & O_NONBLOCK;
2775         result = snd_pcm_oss_write1(substream, buf, count);
2776 #ifdef OSS_DEBUG
2777         pcm_dbg(substream->pcm, "pcm_oss: write %li bytes (wrote %li bytes)\n",
2778                (long)count, (long)result);
2779 #endif
2780         return result;
2781 }
2782
2783 static int snd_pcm_oss_playback_ready(struct snd_pcm_substream *substream)
2784 {
2785         struct snd_pcm_runtime *runtime = substream->runtime;
2786         if (atomic_read(&substream->mmap_count))
2787                 return runtime->oss.prev_hw_ptr_period !=
2788                                                 get_hw_ptr_period(runtime);
2789         else
2790                 return snd_pcm_playback_avail(runtime) >=
2791                                                 runtime->oss.period_frames;
2792 }
2793
2794 static int snd_pcm_oss_capture_ready(struct snd_pcm_substream *substream)
2795 {
2796         struct snd_pcm_runtime *runtime = substream->runtime;
2797         if (atomic_read(&substream->mmap_count))
2798                 return runtime->oss.prev_hw_ptr_period !=
2799                                                 get_hw_ptr_period(runtime);
2800         else
2801                 return snd_pcm_capture_avail(runtime) >=
2802                                                 runtime->oss.period_frames;
2803 }
2804
2805 static __poll_t snd_pcm_oss_poll(struct file *file, poll_table * wait)
2806 {
2807         struct snd_pcm_oss_file *pcm_oss_file;
2808         __poll_t mask;
2809         struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2810
2811         pcm_oss_file = file->private_data;
2812
2813         psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2814         csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2815
2816         mask = 0;
2817         if (psubstream != NULL) {
2818                 struct snd_pcm_runtime *runtime = psubstream->runtime;
2819                 poll_wait(file, &runtime->sleep, wait);
2820                 snd_pcm_stream_lock_irq(psubstream);
2821                 if (runtime->status->state != SNDRV_PCM_STATE_DRAINING &&
2822                     (runtime->status->state != SNDRV_PCM_STATE_RUNNING ||
2823                      snd_pcm_oss_playback_ready(psubstream)))
2824                         mask |= EPOLLOUT | EPOLLWRNORM;
2825                 snd_pcm_stream_unlock_irq(psubstream);
2826         }
2827         if (csubstream != NULL) {
2828                 struct snd_pcm_runtime *runtime = csubstream->runtime;
2829                 snd_pcm_state_t ostate;
2830                 poll_wait(file, &runtime->sleep, wait);
2831                 snd_pcm_stream_lock_irq(csubstream);
2832                 if ((ostate = runtime->status->state) != SNDRV_PCM_STATE_RUNNING ||
2833                     snd_pcm_oss_capture_ready(csubstream))
2834                         mask |= EPOLLIN | EPOLLRDNORM;
2835                 snd_pcm_stream_unlock_irq(csubstream);
2836                 if (ostate != SNDRV_PCM_STATE_RUNNING && runtime->oss.trigger) {
2837                         struct snd_pcm_oss_file ofile;
2838                         memset(&ofile, 0, sizeof(ofile));
2839                         ofile.streams[SNDRV_PCM_STREAM_CAPTURE] = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2840                         runtime->oss.trigger = 0;
2841                         snd_pcm_oss_set_trigger(&ofile, PCM_ENABLE_INPUT);
2842                 }
2843         }
2844
2845         return mask;
2846 }
2847
2848 static int snd_pcm_oss_mmap(struct file *file, struct vm_area_struct *area)
2849 {
2850         struct snd_pcm_oss_file *pcm_oss_file;
2851         struct snd_pcm_substream *substream = NULL;
2852         struct snd_pcm_runtime *runtime;
2853         int err;
2854
2855 #ifdef OSS_DEBUG
2856         pr_debug("pcm_oss: mmap begin\n");
2857 #endif
2858         pcm_oss_file = file->private_data;
2859         switch ((area->vm_flags & (VM_READ | VM_WRITE))) {
2860         case VM_READ | VM_WRITE:
2861                 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2862                 if (substream)
2863                         break;
2864                 /* Fall through */
2865         case VM_READ:
2866                 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2867                 break;
2868         case VM_WRITE:
2869                 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2870                 break;
2871         default:
2872                 return -EINVAL;
2873         }
2874         /* set VM_READ access as well to fix memset() routines that do
2875            reads before writes (to improve performance) */
2876         area->vm_flags |= VM_READ;
2877         if (substream == NULL)
2878                 return -ENXIO;
2879         runtime = substream->runtime;
2880         if (!(runtime->info & SNDRV_PCM_INFO_MMAP_VALID))
2881                 return -EIO;
2882         if (runtime->info & SNDRV_PCM_INFO_INTERLEAVED)
2883                 runtime->access = SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
2884         else
2885                 return -EIO;
2886
2887         if (runtime->oss.params) {
2888                 /* use mutex_trylock() for params_lock for avoiding a deadlock
2889                  * between mmap_sem and params_lock taken by
2890                  * copy_from/to_user() in snd_pcm_oss_write/read()
2891                  */
2892                 err = snd_pcm_oss_change_params(substream, true);
2893                 if (err < 0)
2894                         return err;
2895         }
2896 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
2897         if (runtime->oss.plugin_first != NULL)
2898                 return -EIO;
2899 #endif
2900
2901         if (area->vm_pgoff != 0)
2902                 return -EINVAL;
2903
2904         err = snd_pcm_mmap_data(substream, file, area);
2905         if (err < 0)
2906                 return err;
2907         runtime->oss.mmap_bytes = area->vm_end - area->vm_start;
2908         runtime->silence_threshold = 0;
2909         runtime->silence_size = 0;
2910 #ifdef OSS_DEBUG
2911         pr_debug("pcm_oss: mmap ok, bytes = 0x%x\n",
2912                runtime->oss.mmap_bytes);
2913 #endif
2914         /* In mmap mode we never stop */
2915         runtime->stop_threshold = runtime->boundary;
2916
2917         return 0;
2918 }
2919
2920 #ifdef CONFIG_SND_VERBOSE_PROCFS
2921 /*
2922  *  /proc interface
2923  */
2924
2925 static void snd_pcm_oss_proc_read(struct snd_info_entry *entry,
2926                                   struct snd_info_buffer *buffer)
2927 {
2928         struct snd_pcm_str *pstr = entry->private_data;
2929         struct snd_pcm_oss_setup *setup = pstr->oss.setup_list;
2930         mutex_lock(&pstr->oss.setup_mutex);
2931         while (setup) {
2932                 snd_iprintf(buffer, "%s %u %u%s%s%s%s%s%s\n",
2933                             setup->task_name,
2934                             setup->periods,
2935                             setup->period_size,
2936                             setup->disable ? " disable" : "",
2937                             setup->direct ? " direct" : "",
2938                             setup->block ? " block" : "",
2939                             setup->nonblock ? " non-block" : "",
2940                             setup->partialfrag ? " partial-frag" : "",
2941                             setup->nosilence ? " no-silence" : "");
2942                 setup = setup->next;
2943         }
2944         mutex_unlock(&pstr->oss.setup_mutex);
2945 }
2946
2947 static void snd_pcm_oss_proc_free_setup_list(struct snd_pcm_str * pstr)
2948 {
2949         struct snd_pcm_oss_setup *setup, *setupn;
2950
2951         for (setup = pstr->oss.setup_list, pstr->oss.setup_list = NULL;
2952              setup; setup = setupn) {
2953                 setupn = setup->next;
2954                 kfree(setup->task_name);
2955                 kfree(setup);
2956         }
2957         pstr->oss.setup_list = NULL;
2958 }
2959
2960 static void snd_pcm_oss_proc_write(struct snd_info_entry *entry,
2961                                    struct snd_info_buffer *buffer)
2962 {
2963         struct snd_pcm_str *pstr = entry->private_data;
2964         char line[128], str[32], task_name[32];
2965         const char *ptr;
2966         int idx1;
2967         struct snd_pcm_oss_setup *setup, *setup1, template;
2968
2969         while (!snd_info_get_line(buffer, line, sizeof(line))) {
2970                 mutex_lock(&pstr->oss.setup_mutex);
2971                 memset(&template, 0, sizeof(template));
2972                 ptr = snd_info_get_str(task_name, line, sizeof(task_name));
2973                 if (!strcmp(task_name, "clear") || !strcmp(task_name, "erase")) {
2974                         snd_pcm_oss_proc_free_setup_list(pstr);
2975                         mutex_unlock(&pstr->oss.setup_mutex);
2976                         continue;
2977                 }
2978                 for (setup = pstr->oss.setup_list; setup; setup = setup->next) {
2979                         if (!strcmp(setup->task_name, task_name)) {
2980                                 template = *setup;
2981                                 break;
2982                         }
2983                 }
2984                 ptr = snd_info_get_str(str, ptr, sizeof(str));
2985                 template.periods = simple_strtoul(str, NULL, 10);
2986                 ptr = snd_info_get_str(str, ptr, sizeof(str));
2987                 template.period_size = simple_strtoul(str, NULL, 10);
2988                 for (idx1 = 31; idx1 >= 0; idx1--)
2989                         if (template.period_size & (1 << idx1))
2990                                 break;
2991                 for (idx1--; idx1 >= 0; idx1--)
2992                         template.period_size &= ~(1 << idx1);
2993                 do {
2994                         ptr = snd_info_get_str(str, ptr, sizeof(str));
2995                         if (!strcmp(str, "disable")) {
2996                                 template.disable = 1;
2997                         } else if (!strcmp(str, "direct")) {
2998                                 template.direct = 1;
2999                         } else if (!strcmp(str, "block")) {
3000                                 template.block = 1;
3001                         } else if (!strcmp(str, "non-block")) {
3002                                 template.nonblock = 1;
3003                         } else if (!strcmp(str, "partial-frag")) {
3004                                 template.partialfrag = 1;
3005                         } else if (!strcmp(str, "no-silence")) {
3006                                 template.nosilence = 1;
3007                         } else if (!strcmp(str, "buggy-ptr")) {
3008                                 template.buggyptr = 1;
3009                         }
3010                 } while (*str);
3011                 if (setup == NULL) {
3012                         setup = kmalloc(sizeof(*setup), GFP_KERNEL);
3013                         if (! setup) {
3014                                 buffer->error = -ENOMEM;
3015                                 mutex_unlock(&pstr->oss.setup_mutex);
3016                                 return;
3017                         }
3018                         if (pstr->oss.setup_list == NULL)
3019                                 pstr->oss.setup_list = setup;
3020                         else {
3021                                 for (setup1 = pstr->oss.setup_list;
3022                                      setup1->next; setup1 = setup1->next);
3023                                 setup1->next = setup;
3024                         }
3025                         template.task_name = kstrdup(task_name, GFP_KERNEL);
3026                         if (! template.task_name) {
3027                                 kfree(setup);
3028                                 buffer->error = -ENOMEM;
3029                                 mutex_unlock(&pstr->oss.setup_mutex);
3030                                 return;
3031                         }
3032                 }
3033                 *setup = template;
3034                 mutex_unlock(&pstr->oss.setup_mutex);
3035         }
3036 }
3037
3038 static void snd_pcm_oss_proc_init(struct snd_pcm *pcm)
3039 {
3040         int stream;
3041         for (stream = 0; stream < 2; ++stream) {
3042                 struct snd_info_entry *entry;
3043                 struct snd_pcm_str *pstr = &pcm->streams[stream];
3044                 if (pstr->substream_count == 0)
3045                         continue;
3046                 if ((entry = snd_info_create_card_entry(pcm->card, "oss", pstr->proc_root)) != NULL) {
3047                         entry->content = SNDRV_INFO_CONTENT_TEXT;
3048                         entry->mode = S_IFREG | 0644;
3049                         entry->c.text.read = snd_pcm_oss_proc_read;
3050                         entry->c.text.write = snd_pcm_oss_proc_write;
3051                         entry->private_data = pstr;
3052                         if (snd_info_register(entry) < 0) {
3053                                 snd_info_free_entry(entry);
3054                                 entry = NULL;
3055                         }
3056                 }
3057                 pstr->oss.proc_entry = entry;
3058         }
3059 }
3060
3061 static void snd_pcm_oss_proc_done(struct snd_pcm *pcm)
3062 {
3063         int stream;
3064         for (stream = 0; stream < 2; ++stream) {
3065                 struct snd_pcm_str *pstr = &pcm->streams[stream];
3066                 snd_info_free_entry(pstr->oss.proc_entry);
3067                 pstr->oss.proc_entry = NULL;
3068                 snd_pcm_oss_proc_free_setup_list(pstr);
3069         }
3070 }
3071 #else /* !CONFIG_SND_VERBOSE_PROCFS */
3072 #define snd_pcm_oss_proc_init(pcm)
3073 #define snd_pcm_oss_proc_done(pcm)
3074 #endif /* CONFIG_SND_VERBOSE_PROCFS */
3075
3076 /*
3077  *  ENTRY functions
3078  */
3079
3080 static const struct file_operations snd_pcm_oss_f_reg =
3081 {
3082         .owner =        THIS_MODULE,
3083         .read =         snd_pcm_oss_read,
3084         .write =        snd_pcm_oss_write,
3085         .open =         snd_pcm_oss_open,
3086         .release =      snd_pcm_oss_release,
3087         .llseek =       no_llseek,
3088         .poll =         snd_pcm_oss_poll,
3089         .unlocked_ioctl =       snd_pcm_oss_ioctl,
3090         .compat_ioctl = snd_pcm_oss_ioctl_compat,
3091         .mmap =         snd_pcm_oss_mmap,
3092 };
3093
3094 static void register_oss_dsp(struct snd_pcm *pcm, int index)
3095 {
3096         if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3097                                     pcm->card, index, &snd_pcm_oss_f_reg,
3098                                     pcm) < 0) {
3099                 pcm_err(pcm, "unable to register OSS PCM device %i:%i\n",
3100                            pcm->card->number, pcm->device);
3101         }
3102 }
3103
3104 static int snd_pcm_oss_register_minor(struct snd_pcm *pcm)
3105 {
3106         pcm->oss.reg = 0;
3107         if (dsp_map[pcm->card->number] == (int)pcm->device) {
3108                 char name[128];
3109                 int duplex;
3110                 register_oss_dsp(pcm, 0);
3111                 duplex = (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count > 0 &&
3112                               pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count &&
3113                               !(pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX));
3114                 sprintf(name, "%s%s", pcm->name, duplex ? " (DUPLEX)" : "");
3115 #ifdef SNDRV_OSS_INFO_DEV_AUDIO
3116                 snd_oss_info_register(SNDRV_OSS_INFO_DEV_AUDIO,
3117                                       pcm->card->number,
3118                                       name);
3119 #endif
3120                 pcm->oss.reg++;
3121                 pcm->oss.reg_mask |= 1;
3122         }
3123         if (adsp_map[pcm->card->number] == (int)pcm->device) {
3124                 register_oss_dsp(pcm, 1);
3125                 pcm->oss.reg++;
3126                 pcm->oss.reg_mask |= 2;
3127         }
3128
3129         if (pcm->oss.reg)
3130                 snd_pcm_oss_proc_init(pcm);
3131
3132         return 0;
3133 }
3134
3135 static int snd_pcm_oss_disconnect_minor(struct snd_pcm *pcm)
3136 {
3137         if (pcm->oss.reg) {
3138                 if (pcm->oss.reg_mask & 1) {
3139                         pcm->oss.reg_mask &= ~1;
3140                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3141                                                   pcm->card, 0);
3142                 }
3143                 if (pcm->oss.reg_mask & 2) {
3144                         pcm->oss.reg_mask &= ~2;
3145                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3146                                                   pcm->card, 1);
3147                 }
3148                 if (dsp_map[pcm->card->number] == (int)pcm->device) {
3149 #ifdef SNDRV_OSS_INFO_DEV_AUDIO
3150                         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_AUDIO, pcm->card->number);
3151 #endif
3152                 }
3153                 pcm->oss.reg = 0;
3154         }
3155         return 0;
3156 }
3157
3158 static int snd_pcm_oss_unregister_minor(struct snd_pcm *pcm)
3159 {
3160         snd_pcm_oss_disconnect_minor(pcm);
3161         snd_pcm_oss_proc_done(pcm);
3162         return 0;
3163 }
3164
3165 static struct snd_pcm_notify snd_pcm_oss_notify =
3166 {
3167         .n_register =   snd_pcm_oss_register_minor,
3168         .n_disconnect = snd_pcm_oss_disconnect_minor,
3169         .n_unregister = snd_pcm_oss_unregister_minor,
3170 };
3171
3172 static int __init alsa_pcm_oss_init(void)
3173 {
3174         int i;
3175         int err;
3176
3177         /* check device map table */
3178         for (i = 0; i < SNDRV_CARDS; i++) {
3179                 if (dsp_map[i] < 0 || dsp_map[i] >= SNDRV_PCM_DEVICES) {
3180                         pr_err("ALSA: pcm_oss: invalid dsp_map[%d] = %d\n",
3181                                    i, dsp_map[i]);
3182                         dsp_map[i] = 0;
3183                 }
3184                 if (adsp_map[i] < 0 || adsp_map[i] >= SNDRV_PCM_DEVICES) {
3185                         pr_err("ALSA: pcm_oss: invalid adsp_map[%d] = %d\n",
3186                                    i, adsp_map[i]);
3187                         adsp_map[i] = 1;
3188                 }
3189         }
3190         if ((err = snd_pcm_notify(&snd_pcm_oss_notify, 0)) < 0)
3191                 return err;
3192         return 0;
3193 }
3194
3195 static void __exit alsa_pcm_oss_exit(void)
3196 {
3197         snd_pcm_notify(&snd_pcm_oss_notify, 1);
3198 }
3199
3200 module_init(alsa_pcm_oss_init)
3201 module_exit(alsa_pcm_oss_exit)