drivers/staging/vc04_services/bcm2835-audio/bcm2835-vchiq.c

   1 /*****************************************************************************
   2  * Copyright 2011 Broadcom Corporation.  All rights reserved.
   3  *
   4  * Unless you and Broadcom execute a separate written software license
   5  * agreement governing use of this software, this software is licensed to you
   6  * under the terms of the GNU General Public License version 2, available at
   7  * http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
   8  *
   9  * Notwithstanding the above, under no circumstances may you combine this
  10  * software in any way with any other Broadcom software provided under a
  11  * license other than the GPL, without Broadcom's express prior written
  12  * consent.
  13  *****************************************************************************/
  14
  15 #include <linux/device.h>
  16 #include <sound/core.h>
  17 #include <sound/initval.h>
  18 #include <sound/pcm.h>
  19 #include <linux/io.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/fs.h>
  22 #include <linux/file.h>
  23 #include <linux/mm.h>
  24 #include <linux/syscalls.h>
  25 #include <linux/uaccess.h>
  26 #include <linux/slab.h>
  27 #include <linux/delay.h>
  28 #include <linux/atomic.h>
  29 #include <linux/module.h>
  30 #include <linux/completion.h>
  31
  32 #include "bcm2835.h"
  33
  34 /* ---- Include Files -------------------------------------------------------- */
  35
  36 #include "interface/vchi/vchi.h"
  37 #include "vc_vchi_audioserv_defs.h"
  38
  39 /* ---- Private Constants and Types ------------------------------------------ */
  40
  41 #define BCM2835_AUDIO_STOP           0
  42 #define BCM2835_AUDIO_START          1
  43 #define BCM2835_AUDIO_WRITE          2
  44
  45 /* Logging macros (for remapping to other logging mechanisms, i.e., printf) */
  46 #ifdef AUDIO_DEBUG_ENABLE
  47 #define LOG_ERR(fmt, arg...)   pr_err("%s:%d " fmt, __func__, __LINE__, ##arg)
  48 #define LOG_WARN(fmt, arg...)  pr_info("%s:%d " fmt, __func__, __LINE__, ##arg)
  49 #define LOG_INFO(fmt, arg...)  pr_info("%s:%d " fmt, __func__, __LINE__, ##arg)
  50 #define LOG_DBG(fmt, arg...)   pr_info("%s:%d " fmt, __func__, __LINE__, ##arg)
  51 #else
  52 #define LOG_ERR(fmt, arg...)   pr_err("%s:%d " fmt, __func__, __LINE__, ##arg)
  53 #define LOG_WARN(fmt, arg...)    no_printk(fmt, ##arg)
  54 #define LOG_INFO(fmt, arg...)    no_printk(fmt, ##arg)
  55 #define LOG_DBG(fmt, arg...)     no_printk(fmt, ##arg)
  56 #endif
  57
  58 struct bcm2835_audio_instance {
  59         unsigned int num_connections;
  60         VCHI_SERVICE_HANDLE_T vchi_handle[VCHI_MAX_NUM_CONNECTIONS];
  61         struct completion msg_avail_comp;
  62         struct mutex vchi_mutex;
  63         struct bcm2835_alsa_stream *alsa_stream;
  64         int result;
  65         short peer_version;
  66 };
  67
  68 static bool force_bulk;
  69
  70 /* ---- Private Variables ---------------------------------------------------- */
  71
  72 /* ---- Private Function Prototypes ------------------------------------------ */
  73
  74 /* ---- Private Functions ---------------------------------------------------- */
  75
  76 static int bcm2835_audio_stop_worker(struct bcm2835_alsa_stream *alsa_stream);
  77 static int bcm2835_audio_start_worker(struct bcm2835_alsa_stream *alsa_stream);
  78 static int bcm2835_audio_write_worker(struct bcm2835_alsa_stream *alsa_stream,
  79                                       unsigned int count, void *src);
  80
  81 // Routine to send a message across a service
  82
  83 static int
  84 bcm2835_vchi_msg_queue(VCHI_SERVICE_HANDLE_T handle,
  85                        void *data,
  86                        unsigned int size)
  87 {
  88         return vchi_queue_kernel_message(handle,
  89                                          data,
  90                                          size);
  91 }
  92
  93 static const u32 BCM2835_AUDIO_WRITE_COOKIE1 = ('B' << 24 | 'C' << 16 |
  94                                                 'M' << 8  | 'A');
  95 static const u32 BCM2835_AUDIO_WRITE_COOKIE2 = ('D' << 24 | 'A' << 16 |
  96                                                 'T' << 8  | 'A');
  97
  98 struct bcm2835_audio_work {
  99         struct work_struct my_work;
 100         struct bcm2835_alsa_stream *alsa_stream;
 101         int cmd;
 102         void *src;
 103         unsigned int count;
 104 };
 105
 106 static void my_wq_function(struct work_struct *work)
 107 {
 108         struct bcm2835_audio_work *w =
 109                 container_of(work, struct bcm2835_audio_work, my_work);
 110         int ret = -9;
 111
 112         switch (w->cmd) {
 113         case BCM2835_AUDIO_START:
 114                 ret = bcm2835_audio_start_worker(w->alsa_stream);
 115                 break;
 116         case BCM2835_AUDIO_STOP:
 117                 ret = bcm2835_audio_stop_worker(w->alsa_stream);
 118                 break;
 119         case BCM2835_AUDIO_WRITE:
 120                 ret = bcm2835_audio_write_worker(w->alsa_stream, w->count,
 121                                                  w->src);
 122                 break;
 123         default:
 124                 LOG_ERR(" Unexpected work: %p:%d\n", w->alsa_stream, w->cmd);
 125                 break;
 126         }
 127         kfree((void *)work);
 128 }
 129
 130 int bcm2835_audio_start(struct bcm2835_alsa_stream *alsa_stream)
 131 {
 132         if (alsa_stream->my_wq) {
 133                 struct bcm2835_audio_work *work;
 134
 135                 work = kmalloc(sizeof(*work), GFP_ATOMIC);
 136                 /*--- Queue some work (item 1) ---*/
 137                 if (!work) {
 138                         LOG_ERR(" .. Error: NULL work kmalloc\n");
 139                         return -ENOMEM;
 140                 }
 141                 INIT_WORK(&work->my_work, my_wq_function);
 142                 work->alsa_stream = alsa_stream;
 143                 work->cmd = BCM2835_AUDIO_START;
 144                 if (!queue_work(alsa_stream->my_wq, &work->my_work)) {
 145                         kfree(work);
 146                         return -EBUSY;
 147                 }
 148         }
 149         return 0;
 150 }
 151
 152 int bcm2835_audio_stop(struct bcm2835_alsa_stream *alsa_stream)
 153 {
 154         if (alsa_stream->my_wq) {
 155                 struct bcm2835_audio_work *work;
 156
 157                 work = kmalloc(sizeof(*work), GFP_ATOMIC);
 158                 /*--- Queue some work (item 1) ---*/
 159                 if (!work) {
 160                         LOG_ERR(" .. Error: NULL work kmalloc\n");
 161                         return -ENOMEM;
 162                 }
 163                 INIT_WORK(&work->my_work, my_wq_function);
 164                 work->alsa_stream = alsa_stream;
 165                 work->cmd = BCM2835_AUDIO_STOP;
 166                 if (!queue_work(alsa_stream->my_wq, &work->my_work)) {
 167                         kfree(work);
 168                         return -EBUSY;
 169                 }
 170         }
 171         return 0;
 172 }
 173
 174 int bcm2835_audio_write(struct bcm2835_alsa_stream *alsa_stream,
 175                         unsigned int count, void *src)
 176 {
 177         if (alsa_stream->my_wq) {
 178                 struct bcm2835_audio_work *work;
 179
 180                 work = kmalloc(sizeof(*work), GFP_ATOMIC);
 181                 /*--- Queue some work (item 1) ---*/
 182                 if (!work) {
 183                         LOG_ERR(" .. Error: NULL work kmalloc\n");
 184                         return -ENOMEM;
 185                 }
 186                 INIT_WORK(&work->my_work, my_wq_function);
 187                 work->alsa_stream = alsa_stream;
 188                 work->cmd = BCM2835_AUDIO_WRITE;
 189                 work->src = src;
 190                 work->count = count;
 191                 if (!queue_work(alsa_stream->my_wq, &work->my_work)) {
 192                         kfree(work);
 193                         return -EBUSY;
 194                 }
 195         }
 196         return 0;
 197 }
 198
 199 static void my_workqueue_init(struct bcm2835_alsa_stream *alsa_stream)
 200 {
 201         alsa_stream->my_wq = alloc_workqueue("my_queue", WQ_HIGHPRI, 1);
 202 }
 203
 204 static void my_workqueue_quit(struct bcm2835_alsa_stream *alsa_stream)
 205 {
 206         if (alsa_stream->my_wq) {
 207                 flush_workqueue(alsa_stream->my_wq);
 208                 destroy_workqueue(alsa_stream->my_wq);
 209                 alsa_stream->my_wq = NULL;
 210         }
 211 }
 212
 213 static void audio_vchi_callback(void *param,
 214                                 const VCHI_CALLBACK_REASON_T reason,
 215                                 void *msg_handle)
 216 {
 217         struct bcm2835_audio_instance *instance = param;
 218         int status;
 219         int msg_len;
 220         struct vc_audio_msg m;
 221
 222         if (reason != VCHI_CALLBACK_MSG_AVAILABLE)
 223                 return;
 224
 225         if (!instance) {
 226                 LOG_ERR(" .. instance is null\n");
 227                 BUG();
 228                 return;
 229         }
 230         if (!instance->vchi_handle[0]) {
 231                 LOG_ERR(" .. instance->vchi_handle[0] is null\n");
 232                 BUG();
 233                 return;
 234         }
 235         status = vchi_msg_dequeue(instance->vchi_handle[0],
 236                                   &m, sizeof(m), &msg_len, VCHI_FLAGS_NONE);
 237         if (m.type == VC_AUDIO_MSG_TYPE_RESULT) {
 238                 LOG_DBG(" .. instance=%p, m.type=VC_AUDIO_MSG_TYPE_RESULT, success=%d\n",
 239                         instance, m.u.result.success);
 240                 instance->result = m.u.result.success;
 241                 complete(&instance->msg_avail_comp);
 242         } else if (m.type == VC_AUDIO_MSG_TYPE_COMPLETE) {
 243                 struct bcm2835_alsa_stream *alsa_stream = instance->alsa_stream;
 244
 245                 LOG_DBG(" .. instance=%p, m.type=VC_AUDIO_MSG_TYPE_COMPLETE, complete=%d\n",
 246                         instance, m.u.complete.count);
 247                 if (m.u.complete.cookie1 != BCM2835_AUDIO_WRITE_COOKIE1 ||
 248                     m.u.complete.cookie2 != BCM2835_AUDIO_WRITE_COOKIE2)
 249                         LOG_ERR(" .. response is corrupt\n");
 250                 else if (alsa_stream) {
 251                         atomic_add(m.u.complete.count,
 252                                    &alsa_stream->retrieved);
 253                         bcm2835_playback_fifo(alsa_stream);
 254                 } else {
 255                         LOG_ERR(" .. unexpected alsa_stream=%p\n",
 256                                 alsa_stream);
 257                 }
 258         } else {
 259                 LOG_ERR(" .. unexpected m.type=%d\n", m.type);
 260         }
 261 }
 262
 263 static struct bcm2835_audio_instance *
 264 vc_vchi_audio_init(VCHI_INSTANCE_T vchi_instance,
 265                    VCHI_CONNECTION_T **vchi_connections,
 266                    unsigned int num_connections)
 267 {
 268         unsigned int i;
 269         struct bcm2835_audio_instance *instance;
 270         int status;
 271         int ret;
 272
 273         LOG_DBG("%s: start", __func__);
 274
 275         if (num_connections > VCHI_MAX_NUM_CONNECTIONS) {
 276                 LOG_ERR("%s: unsupported number of connections %u (max=%u)\n",
 277                         __func__, num_connections, VCHI_MAX_NUM_CONNECTIONS);
 278
 279                 return ERR_PTR(-EINVAL);
 280         }
 281         /* Allocate memory for this instance */
 282         instance = kzalloc(sizeof(*instance), GFP_KERNEL);
 283         if (!instance)
 284                 return ERR_PTR(-ENOMEM);
 285
 286         instance->num_connections = num_connections;
 287
 288         /* Create a lock for exclusive, serialized VCHI connection access */
 289         mutex_init(&instance->vchi_mutex);
 290         /* Open the VCHI service connections */
 291         for (i = 0; i < num_connections; i++) {
 292                 SERVICE_CREATION_T params = {
 293                         .version                = VCHI_VERSION_EX(VC_AUDIOSERV_VER, VC_AUDIOSERV_MIN_VER),
 294                         .service_id             = VC_AUDIO_SERVER_NAME,
 295                         .connection             = vchi_connections[i],
 296                         .rx_fifo_size           = 0,
 297                         .tx_fifo_size           = 0,
 298                         .callback               = audio_vchi_callback,
 299                         .callback_param         = instance,
 300                         .want_unaligned_bulk_rx = 1, //TODO: remove VCOS_FALSE
 301                         .want_unaligned_bulk_tx = 1, //TODO: remove VCOS_FALSE
 302                         .want_crc               = 0
 303                 };
 304
 305                 LOG_DBG("%s: about to open %i\n", __func__, i);
 306                 status = vchi_service_open(vchi_instance, &params,
 307                                            &instance->vchi_handle[i]);
 308
 309                 LOG_DBG("%s: opened %i: %p=%d\n", __func__, i, instance->vchi_handle[i], status);
 310                 if (status) {
 311                         LOG_ERR("%s: failed to open VCHI service connection (status=%d)\n",
 312                                 __func__, status);
 313                         ret = -EPERM;
 314                         goto err_close_services;
 315                 }
 316                 /* Finished with the service for now */
 317                 vchi_service_release(instance->vchi_handle[i]);
 318         }
 319
 320         LOG_DBG("%s: okay\n", __func__);
 321         return instance;
 322
 323 err_close_services:
 324         for (i = 0; i < instance->num_connections; i++) {
 325                 LOG_ERR("%s: closing %i: %p\n", __func__, i, instance->vchi_handle[i]);
 326                 if (instance->vchi_handle[i])
 327                         vchi_service_close(instance->vchi_handle[i]);
 328         }
 329
 330         kfree(instance);
 331         LOG_ERR("%s: error\n", __func__);
 332
 333         return ERR_PTR(ret);
 334 }
 335
 336 static int vc_vchi_audio_deinit(struct bcm2835_audio_instance *instance)
 337 {
 338         unsigned int i;
 339
 340
 341         if (!instance) {
 342                 LOG_ERR("%s: invalid handle %p\n", __func__, instance);
 343
 344                 return -1;
 345         }
 346
 347         LOG_DBG(" .. about to lock (%d)\n", instance->num_connections);
 348         if (mutex_lock_interruptible(&instance->vchi_mutex)) {
 349                 LOG_DBG("Interrupted whilst waiting for lock on (%d)\n",
 350                         instance->num_connections);
 351                 return -EINTR;
 352         }
 353
 354         /* Close all VCHI service connections */
 355         for (i = 0; i < instance->num_connections; i++) {
 356                 int status;
 357
 358                 LOG_DBG(" .. %i:closing %p\n", i, instance->vchi_handle[i]);
 359                 vchi_service_use(instance->vchi_handle[i]);
 360
 361                 status = vchi_service_close(instance->vchi_handle[i]);
 362                 if (status) {
 363                         LOG_DBG("%s: failed to close VCHI service connection (status=%d)\n",
 364                                 __func__, status);
 365                 }
 366         }
 367
 368         mutex_unlock(&instance->vchi_mutex);
 369
 370         kfree(instance);
 371
 372
 373         return 0;
 374 }
 375
 376 static int bcm2835_audio_open_connection(struct bcm2835_alsa_stream *alsa_stream)
 377 {
 378         static VCHI_INSTANCE_T vchi_instance;
 379         static VCHI_CONNECTION_T *vchi_connection;
 380         static int initted;
 381         struct bcm2835_audio_instance *instance =
 382                 (struct bcm2835_audio_instance *)alsa_stream->instance;
 383         int ret;
 384
 385
 386         LOG_INFO("%s: start\n", __func__);
 387         BUG_ON(instance);
 388         if (instance) {
 389                 LOG_ERR("%s: VCHI instance already open (%p)\n",
 390                         __func__, instance);
 391                 instance->alsa_stream = alsa_stream;
 392                 alsa_stream->instance = instance;
 393                 return 0;
 394         }
 395
 396         /* Initialize and create a VCHI connection */
 397         if (!initted) {
 398                 ret = vchi_initialise(&vchi_instance);
 399                 if (ret) {
 400                         LOG_ERR("%s: failed to initialise VCHI instance (ret=%d)\n",
 401                                 __func__, ret);
 402
 403                         return -EIO;
 404                 }
 405                 ret = vchi_connect(NULL, 0, vchi_instance);
 406                 if (ret) {
 407                         LOG_ERR("%s: failed to connect VCHI instance (ret=%d)\n",
 408                                 __func__, ret);
 409
 410                         kfree(vchi_instance);
 411                         return -EIO;
 412                 }
 413                 initted = 1;
 414         }
 415
 416         /* Initialize an instance of the audio service */
 417         instance = vc_vchi_audio_init(vchi_instance, &vchi_connection, 1);
 418
 419         if (IS_ERR(instance)) {
 420                 LOG_ERR("%s: failed to initialize audio service\n", __func__);
 421
 422                 /* vchi_instance is retained for use the next time. */
 423                 return PTR_ERR(instance);
 424         }
 425
 426         instance->alsa_stream = alsa_stream;
 427         alsa_stream->instance = instance;
 428
 429         LOG_DBG(" success !\n");
 430
 431         return 0;
 432 }
 433
 434 int bcm2835_audio_open(struct bcm2835_alsa_stream *alsa_stream)
 435 {
 436         struct bcm2835_audio_instance *instance;
 437         struct vc_audio_msg m;
 438         int status;
 439         int ret;
 440
 441
 442         my_workqueue_init(alsa_stream);
 443
 444         ret = bcm2835_audio_open_connection(alsa_stream);
 445         if (ret) {
 446                 ret = -1;
 447                 goto exit;
 448         }
 449         instance = alsa_stream->instance;
 450         LOG_DBG(" instance (%p)\n", instance);
 451
 452         if (mutex_lock_interruptible(&instance->vchi_mutex)) {
 453                 LOG_DBG("Interrupted whilst waiting for lock on (%d)\n", instance->num_connections);
 454                 return -EINTR;
 455         }
 456         vchi_service_use(instance->vchi_handle[0]);
 457
 458         m.type = VC_AUDIO_MSG_TYPE_OPEN;
 459
 460         /* Send the message to the videocore */
 461         status = bcm2835_vchi_msg_queue(instance->vchi_handle[0],
 462                                         &m, sizeof(m));
 463
 464         if (status) {
 465                 LOG_ERR("%s: failed on vchi_msg_queue (status=%d)\n",
 466                         __func__, status);
 467
 468                 ret = -1;
 469                 goto unlock;
 470         }
 471
 472         ret = 0;
 473
 474 unlock:
 475         vchi_service_release(instance->vchi_handle[0]);
 476         mutex_unlock(&instance->vchi_mutex);
 477 exit:
 478         return ret;
 479 }
 480
 481 static int bcm2835_audio_set_ctls_chan(struct bcm2835_alsa_stream *alsa_stream,
 482                                        struct bcm2835_chip *chip)
 483 {
 484         struct vc_audio_msg m;
 485         struct bcm2835_audio_instance *instance = alsa_stream->instance;
 486         int status;
 487         int ret;
 488
 489
 490         LOG_INFO(" Setting ALSA dest(%d), volume(%d)\n",
 491                  chip->dest, chip->volume);
 492
 493         if (mutex_lock_interruptible(&instance->vchi_mutex)) {
 494                 LOG_DBG("Interrupted whilst waiting for lock on (%d)\n",
 495                         instance->num_connections);
 496                 return -EINTR;
 497         }
 498         vchi_service_use(instance->vchi_handle[0]);
 499
 500         instance->result = -1;
 501
 502         m.type = VC_AUDIO_MSG_TYPE_CONTROL;
 503         m.u.control.dest = chip->dest;
 504         m.u.control.volume = chip->volume;
 505
 506         /* Create the message available completion */
 507         init_completion(&instance->msg_avail_comp);
 508
 509         /* Send the message to the videocore */
 510         status = bcm2835_vchi_msg_queue(instance->vchi_handle[0],
 511                                         &m, sizeof(m));
 512
 513         if (status) {
 514                 LOG_ERR("%s: failed on vchi_msg_queue (status=%d)\n",
 515                         __func__, status);
 516
 517                 ret = -1;
 518                 goto unlock;
 519         }
 520
 521         /* We are expecting a reply from the videocore */
 522         wait_for_completion(&instance->msg_avail_comp);
 523
 524         if (instance->result) {
 525                 LOG_ERR("%s: result=%d\n", __func__, instance->result);
 526
 527                 ret = -1;
 528                 goto unlock;
 529         }
 530
 531         ret = 0;
 532
 533 unlock:
 534         vchi_service_release(instance->vchi_handle[0]);
 535         mutex_unlock(&instance->vchi_mutex);
 536
 537         return ret;
 538 }
 539
 540 int bcm2835_audio_set_ctls(struct bcm2835_chip *chip)
 541 {
 542         int i;
 543         int ret = 0;
 544
 545         LOG_DBG(" Setting ALSA dest(%d), volume(%d)\n", chip->dest, chip->volume);
 546
 547         /* change ctls for all substreams */
 548         for (i = 0; i < MAX_SUBSTREAMS; i++) {
 549                 if (chip->avail_substreams & (1 << i)) {
 550                         if (!chip->alsa_stream[i]) {
 551                                 LOG_DBG(" No ALSA stream available?! %i:%p (%x)\n", i, chip->alsa_stream[i], chip->avail_substreams);
 552                                 ret = 0;
 553                         } else if (bcm2835_audio_set_ctls_chan(chip->alsa_stream[i], chip) != 0) {
 554                                 LOG_ERR("Couldn't set the controls for stream %d\n", i);
 555                                 ret = -1;
 556                         } else {
 557                                 LOG_DBG(" Controls set for stream %d\n", i);
 558                         }
 559                 }
 560         }
 561         return ret;
 562 }
 563
 564 int bcm2835_audio_set_params(struct bcm2835_alsa_stream *alsa_stream,
 565                              unsigned int channels, unsigned int samplerate,
 566                              unsigned int bps)
 567 {
 568         struct vc_audio_msg m;
 569         struct bcm2835_audio_instance *instance = alsa_stream->instance;
 570         int status;
 571         int ret;
 572
 573
 574         LOG_INFO(" Setting ALSA channels(%d), samplerate(%d), bits-per-sample(%d)\n",
 575                  channels, samplerate, bps);
 576
 577         /* resend ctls - alsa_stream may not have been open when first send */
 578         ret = bcm2835_audio_set_ctls_chan(alsa_stream, alsa_stream->chip);
 579         if (ret) {
 580                 LOG_ERR(" Alsa controls not supported\n");
 581                 return -EINVAL;
 582         }
 583
 584         if (mutex_lock_interruptible(&instance->vchi_mutex)) {
 585                 LOG_DBG("Interrupted whilst waiting for lock on (%d)\n", instance->num_connections);
 586                 return -EINTR;
 587         }
 588         vchi_service_use(instance->vchi_handle[0]);
 589
 590         instance->result = -1;
 591
 592         m.type = VC_AUDIO_MSG_TYPE_CONFIG;
 593         m.u.config.channels = channels;
 594         m.u.config.samplerate = samplerate;
 595         m.u.config.bps = bps;
 596
 597         /* Create the message available completion */
 598         init_completion(&instance->msg_avail_comp);
 599
 600         /* Send the message to the videocore */
 601         status = bcm2835_vchi_msg_queue(instance->vchi_handle[0],
 602                                         &m, sizeof(m));
 603
 604         if (status) {
 605                 LOG_ERR("%s: failed on vchi_msg_queue (status=%d)\n",
 606                         __func__, status);
 607
 608                 ret = -1;
 609                 goto unlock;
 610         }
 611
 612         /* We are expecting a reply from the videocore */
 613         wait_for_completion(&instance->msg_avail_comp);
 614
 615         if (instance->result) {
 616                 LOG_ERR("%s: result=%d", __func__, instance->result);
 617
 618                 ret = -1;
 619                 goto unlock;
 620         }
 621
 622         ret = 0;
 623
 624 unlock:
 625         vchi_service_release(instance->vchi_handle[0]);
 626         mutex_unlock(&instance->vchi_mutex);
 627
 628         return ret;
 629 }
 630
 631 int bcm2835_audio_setup(struct bcm2835_alsa_stream *alsa_stream)
 632 {
 633
 634
 635         return 0;
 636 }
 637
 638 static int bcm2835_audio_start_worker(struct bcm2835_alsa_stream *alsa_stream)
 639 {
 640         struct vc_audio_msg m;
 641         struct bcm2835_audio_instance *instance = alsa_stream->instance;
 642         int status;
 643         int ret;
 644
 645
 646         if (mutex_lock_interruptible(&instance->vchi_mutex)) {
 647                 LOG_DBG("Interrupted whilst waiting for lock on (%d)\n",
 648                         instance->num_connections);
 649                 return -EINTR;
 650         }
 651         vchi_service_use(instance->vchi_handle[0]);
 652
 653         m.type = VC_AUDIO_MSG_TYPE_START;
 654
 655         /* Send the message to the videocore */
 656         status = bcm2835_vchi_msg_queue(instance->vchi_handle[0],
 657                                         &m, sizeof(m));
 658
 659         if (status) {
 660                 LOG_ERR("%s: failed on vchi_msg_queue (status=%d)\n",
 661                         __func__, status);
 662
 663                 ret = -1;
 664                 goto unlock;
 665         }
 666
 667         ret = 0;
 668
 669 unlock:
 670         vchi_service_release(instance->vchi_handle[0]);
 671         mutex_unlock(&instance->vchi_mutex);
 672         return ret;
 673 }
 674
 675 static int bcm2835_audio_stop_worker(struct bcm2835_alsa_stream *alsa_stream)
 676 {
 677         struct vc_audio_msg m;
 678         struct bcm2835_audio_instance *instance = alsa_stream->instance;
 679         int status;
 680         int ret;
 681
 682
 683         if (mutex_lock_interruptible(&instance->vchi_mutex)) {
 684                 LOG_DBG("Interrupted whilst waiting for lock on (%d)\n",
 685                         instance->num_connections);
 686                 return -EINTR;
 687         }
 688         vchi_service_use(instance->vchi_handle[0]);
 689
 690         m.type = VC_AUDIO_MSG_TYPE_STOP;
 691         m.u.stop.draining = alsa_stream->draining;
 692
 693         /* Send the message to the videocore */
 694         status = bcm2835_vchi_msg_queue(instance->vchi_handle[0],
 695                                         &m, sizeof(m));
 696
 697         if (status) {
 698                 LOG_ERR("%s: failed on vchi_msg_queue (status=%d)\n",
 699                         __func__, status);
 700
 701                 ret = -1;
 702                 goto unlock;
 703         }
 704
 705         ret = 0;
 706
 707 unlock:
 708         vchi_service_release(instance->vchi_handle[0]);
 709         mutex_unlock(&instance->vchi_mutex);
 710         return ret;
 711 }
 712
 713 int bcm2835_audio_close(struct bcm2835_alsa_stream *alsa_stream)
 714 {
 715         struct vc_audio_msg m;
 716         struct bcm2835_audio_instance *instance = alsa_stream->instance;
 717         int status;
 718         int ret;
 719
 720
 721         my_workqueue_quit(alsa_stream);
 722
 723         if (mutex_lock_interruptible(&instance->vchi_mutex)) {
 724                 LOG_DBG("Interrupted whilst waiting for lock on (%d)\n",
 725                         instance->num_connections);
 726                 return -EINTR;
 727         }
 728         vchi_service_use(instance->vchi_handle[0]);
 729
 730         m.type = VC_AUDIO_MSG_TYPE_CLOSE;
 731
 732         /* Create the message available completion */
 733         init_completion(&instance->msg_avail_comp);
 734
 735         /* Send the message to the videocore */
 736         status = bcm2835_vchi_msg_queue(instance->vchi_handle[0],
 737                                         &m, sizeof(m));
 738
 739         if (status) {
 740                 LOG_ERR("%s: failed on vchi_msg_queue (status=%d)\n",
 741                         __func__, status);
 742                 ret = -1;
 743                 goto unlock;
 744         }
 745
 746         /* We are expecting a reply from the videocore */
 747         wait_for_completion(&instance->msg_avail_comp);
 748
 749         if (instance->result) {
 750                 LOG_ERR("%s: failed result (result=%d)\n",
 751                         __func__, instance->result);
 752
 753                 ret = -1;
 754                 goto unlock;
 755         }
 756
 757         ret = 0;
 758
 759 unlock:
 760         vchi_service_release(instance->vchi_handle[0]);
 761         mutex_unlock(&instance->vchi_mutex);
 762
 763         /* Stop the audio service */
 764         vc_vchi_audio_deinit(instance);
 765         alsa_stream->instance = NULL;
 766
 767         return ret;
 768 }
 769
 770 static int bcm2835_audio_write_worker(struct bcm2835_alsa_stream *alsa_stream,
 771                                       unsigned int count, void *src)
 772 {
 773         struct vc_audio_msg m;
 774         struct bcm2835_audio_instance *instance = alsa_stream->instance;
 775         int status;
 776         int ret;
 777
 778
 779         LOG_INFO(" Writing %d bytes from %p\n", count, src);
 780
 781         if (mutex_lock_interruptible(&instance->vchi_mutex)) {
 782                 LOG_DBG("Interrupted whilst waiting for lock on (%d)\n",
 783                         instance->num_connections);
 784                 return -EINTR;
 785         }
 786         vchi_service_use(instance->vchi_handle[0]);
 787
 788         if (instance->peer_version == 0 &&
 789             vchi_get_peer_version(instance->vchi_handle[0], &instance->peer_version) == 0)
 790                 LOG_DBG("%s: client version %d connected\n", __func__, instance->peer_version);
 791
 792         m.type = VC_AUDIO_MSG_TYPE_WRITE;
 793         m.u.write.count = count;
 794         // old version uses bulk, new version uses control
 795         m.u.write.max_packet = instance->peer_version < 2 || force_bulk ? 0 : 4000;
 796         m.u.write.cookie1 = BCM2835_AUDIO_WRITE_COOKIE1;
 797         m.u.write.cookie2 = BCM2835_AUDIO_WRITE_COOKIE2;
 798         m.u.write.silence = src == NULL;
 799
 800         /* Send the message to the videocore */
 801         status = bcm2835_vchi_msg_queue(instance->vchi_handle[0],
 802                                         &m, sizeof(m));
 803
 804         if (status) {
 805                 LOG_ERR("%s: failed on vchi_msg_queue (status=%d)\n",
 806                         __func__, status);
 807
 808                 ret = -1;
 809                 goto unlock;
 810         }
 811         if (!m.u.write.silence) {
 812                 if (!m.u.write.max_packet) {
 813                         /* Send the message to the videocore */
 814                         status = vchi_bulk_queue_transmit(instance->vchi_handle[0],
 815                                                           src, count,
 816                                                           0 * VCHI_FLAGS_BLOCK_UNTIL_QUEUED
 817                                                           +
 818                                                           1 * VCHI_FLAGS_BLOCK_UNTIL_DATA_READ,
 819                                                           NULL);
 820                 } else {
 821                         while (count > 0) {
 822                                 int bytes = min_t(int, m.u.write.max_packet, count);
 823
 824                                 status = bcm2835_vchi_msg_queue(instance->vchi_handle[0],
 825                                                                 src, bytes);
 826                                 src = (char *)src + bytes;
 827                                 count -= bytes;
 828                         }
 829                 }
 830                 if (status) {
 831                         LOG_ERR("%s: failed on vchi_bulk_queue_transmit (status=%d)\n",
 832                                 __func__, status);
 833
 834                         ret = -1;
 835                         goto unlock;
 836                 }
 837         }
 838         ret = 0;
 839
 840 unlock:
 841         vchi_service_release(instance->vchi_handle[0]);
 842         mutex_unlock(&instance->vchi_mutex);
 843         return ret;
 844 }
 845
 846 /**
 847  * Returns all buffers from arm->vc
 848  */
 849 void bcm2835_audio_flush_buffers(struct bcm2835_alsa_stream *alsa_stream)
 850 {
 851 }
 852
 853 /**
 854  * Forces VC to flush(drop) its filled playback buffers and
 855  * return them the us. (VC->ARM)
 856  */
 857 void bcm2835_audio_flush_playback_buffers(struct bcm2835_alsa_stream *alsa_stream)
 858 {
 859 }
 860
 861 unsigned int bcm2835_audio_retrieve_buffers(struct bcm2835_alsa_stream *alsa_stream)
 862 {
 863         unsigned int count = atomic_read(&alsa_stream->retrieved);
 864
 865         atomic_sub(count, &alsa_stream->retrieved);
 866         return count;
 867 }
 868
 869 module_param(force_bulk, bool, 0444);
 870 MODULE_PARM_DESC(force_bulk, "Force use of vchiq bulk for audio");