drivers/media/usb/em28xx/em28xx-core.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // em28xx-core.c - driver for Empia EM2800/EM2820/2840 USB video capture devices
   4 //
   5 // Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
   6 //                    Markus Rechberger <mrechberger@gmail.com>
   7 //                    Mauro Carvalho Chehab <mchehab@infradead.org>
   8 //                    Sascha Sommer <saschasommer@freenet.de>
   9 // Copyright (C) 2012 Frank Schäfer <fschaefer.oss@googlemail.com>
  10 //
  11 // This program is free software; you can redistribute it and/or modify
  12 // it under the terms of the GNU General Public License as published by
  13 // the Free Software Foundation; either version 2 of the License, or
  14 // (at your option) any later version.
  15 //
  16 // This program is distributed in the hope that it will be useful,
  17 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 // GNU General Public License for more details.
  20
  21 #include "em28xx.h"
  22
  23 #include <linux/init.h>
  24 #include <linux/jiffies.h>
  25 #include <linux/list.h>
  26 #include <linux/module.h>
  27 #include <linux/slab.h>
  28 #include <linux/usb.h>
  29 #include <linux/vmalloc.h>
  30 #include <sound/ac97_codec.h>
  31 #include <media/v4l2-common.h>
  32
  33 #define DRIVER_AUTHOR "Ludovico Cavedon <cavedon@sssup.it>, " \
  34                       "Markus Rechberger <mrechberger@gmail.com>, " \
  35                       "Mauro Carvalho Chehab <mchehab@infradead.org>, " \
  36                       "Sascha Sommer <saschasommer@freenet.de>"
  37
  38 MODULE_AUTHOR(DRIVER_AUTHOR);
  39 MODULE_DESCRIPTION(DRIVER_DESC);
  40 MODULE_LICENSE("GPL v2");
  41 MODULE_VERSION(EM28XX_VERSION);
  42
  43 /* #define ENABLE_DEBUG_ISOC_FRAMES */
  44
  45 static unsigned int core_debug;
  46 module_param(core_debug, int, 0644);
  47 MODULE_PARM_DESC(core_debug, "enable debug messages [core and isoc]");
  48
  49 #define em28xx_coredbg(fmt, arg...) do {                                \
  50         if (core_debug)                                                 \
  51                 dev_printk(KERN_DEBUG, &dev->intf->dev,                 \
  52                            "core: %s: " fmt, __func__, ## arg);         \
  53 } while (0)
  54
  55 static unsigned int reg_debug;
  56 module_param(reg_debug, int, 0644);
  57 MODULE_PARM_DESC(reg_debug, "enable debug messages [URB reg]");
  58
  59 #define em28xx_regdbg(fmt, arg...) do {                         \
  60         if (reg_debug)                                                  \
  61                 dev_printk(KERN_DEBUG, &dev->intf->dev,                 \
  62                            "reg: %s: " fmt, __func__, ## arg);          \
  63 } while (0)
  64
  65 /* FIXME: don't abuse core_debug */
  66 #define em28xx_isocdbg(fmt, arg...) do {                                \
  67         if (core_debug)                                                 \
  68                 dev_printk(KERN_DEBUG, &dev->intf->dev,                 \
  69                            "core: %s: " fmt, __func__, ## arg);         \
  70 } while (0)
  71
  72 /*
  73  * em28xx_read_reg_req()
  74  * reads data from the usb device specifying bRequest
  75  */
  76 int em28xx_read_reg_req_len(struct em28xx *dev, u8 req, u16 reg,
  77                             char *buf, int len)
  78 {
  79         int ret;
  80         struct usb_device *udev = interface_to_usbdev(dev->intf);
  81         int pipe = usb_rcvctrlpipe(udev, 0);
  82
  83         if (dev->disconnected)
  84                 return -ENODEV;
  85
  86         if (len > URB_MAX_CTRL_SIZE)
  87                 return -EINVAL;
  88
  89         mutex_lock(&dev->ctrl_urb_lock);
  90         ret = usb_control_msg(udev, pipe, req,
  91                               USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  92                               0x0000, reg, dev->urb_buf, len, HZ);
  93         if (ret < 0) {
  94                 em28xx_regdbg("(pipe 0x%08x): IN:  %02x %02x %02x %02x %02x %02x %02x %02x  failed with error %i\n",
  95                               pipe,
  96                               USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  97                               req, 0, 0,
  98                               reg & 0xff, reg >> 8,
  99                               len & 0xff, len >> 8, ret);
 100                 mutex_unlock(&dev->ctrl_urb_lock);
 101                 return usb_translate_errors(ret);
 102         }
 103
 104         if (len)
 105                 memcpy(buf, dev->urb_buf, len);
 106
 107         mutex_unlock(&dev->ctrl_urb_lock);
 108
 109         em28xx_regdbg("(pipe 0x%08x): IN:  %02x %02x %02x %02x %02x %02x %02x %02x <<< %*ph\n",
 110                       pipe, USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 111                       req, 0, 0,
 112                       reg & 0xff, reg >> 8,
 113                       len & 0xff, len >> 8, len, buf);
 114
 115         return ret;
 116 }
 117
 118 /*
 119  * em28xx_read_reg_req()
 120  * reads data from the usb device specifying bRequest
 121  */
 122 int em28xx_read_reg_req(struct em28xx *dev, u8 req, u16 reg)
 123 {
 124         int ret;
 125         u8 val;
 126
 127         ret = em28xx_read_reg_req_len(dev, req, reg, &val, 1);
 128         if (ret < 0)
 129                 return ret;
 130
 131         return val;
 132 }
 133
 134 int em28xx_read_reg(struct em28xx *dev, u16 reg)
 135 {
 136         return em28xx_read_reg_req(dev, USB_REQ_GET_STATUS, reg);
 137 }
 138 EXPORT_SYMBOL_GPL(em28xx_read_reg);
 139
 140 /*
 141  * em28xx_write_regs_req()
 142  * sends data to the usb device, specifying bRequest
 143  */
 144 int em28xx_write_regs_req(struct em28xx *dev, u8 req, u16 reg, char *buf,
 145                           int len)
 146 {
 147         int ret;
 148         struct usb_device *udev = interface_to_usbdev(dev->intf);
 149         int pipe = usb_sndctrlpipe(udev, 0);
 150
 151         if (dev->disconnected)
 152                 return -ENODEV;
 153
 154         if (len < 1 || len > URB_MAX_CTRL_SIZE)
 155                 return -EINVAL;
 156
 157         mutex_lock(&dev->ctrl_urb_lock);
 158         memcpy(dev->urb_buf, buf, len);
 159         ret = usb_control_msg(udev, pipe, req,
 160                               USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 161                               0x0000, reg, dev->urb_buf, len, HZ);
 162         mutex_unlock(&dev->ctrl_urb_lock);
 163
 164         if (ret < 0) {
 165                 em28xx_regdbg("(pipe 0x%08x): OUT:  %02x %02x %02x %02x %02x %02x %02x %02x >>> %*ph  failed with error %i\n",
 166                               pipe,
 167                               USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 168                               req, 0, 0,
 169                               reg & 0xff, reg >> 8,
 170                               len & 0xff, len >> 8, len, buf, ret);
 171                 return usb_translate_errors(ret);
 172         }
 173
 174         em28xx_regdbg("(pipe 0x%08x): OUT:  %02x %02x %02x %02x %02x %02x %02x %02x >>> %*ph\n",
 175                       pipe,
 176                       USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 177                       req, 0, 0,
 178                       reg & 0xff, reg >> 8,
 179                       len & 0xff, len >> 8, len, buf);
 180
 181         if (dev->wait_after_write)
 182                 msleep(dev->wait_after_write);
 183
 184         return ret;
 185 }
 186
 187 int em28xx_write_regs(struct em28xx *dev, u16 reg, char *buf, int len)
 188 {
 189         return em28xx_write_regs_req(dev, USB_REQ_GET_STATUS, reg, buf, len);
 190 }
 191 EXPORT_SYMBOL_GPL(em28xx_write_regs);
 192
 193 /* Write a single register */
 194 int em28xx_write_reg(struct em28xx *dev, u16 reg, u8 val)
 195 {
 196         return em28xx_write_regs(dev, reg, &val, 1);
 197 }
 198 EXPORT_SYMBOL_GPL(em28xx_write_reg);
 199
 200 /*
 201  * em28xx_write_reg_bits()
 202  * sets only some bits (specified by bitmask) of a register, by first reading
 203  * the actual value
 204  */
 205 int em28xx_write_reg_bits(struct em28xx *dev, u16 reg, u8 val,
 206                           u8 bitmask)
 207 {
 208         int oldval;
 209         u8 newval;
 210
 211         oldval = em28xx_read_reg(dev, reg);
 212         if (oldval < 0)
 213                 return oldval;
 214
 215         newval = (((u8)oldval) & ~bitmask) | (val & bitmask);
 216
 217         return em28xx_write_regs(dev, reg, &newval, 1);
 218 }
 219 EXPORT_SYMBOL_GPL(em28xx_write_reg_bits);
 220
 221 /*
 222  * em28xx_toggle_reg_bits()
 223  * toggles/inverts the bits (specified by bitmask) of a register
 224  */
 225 int em28xx_toggle_reg_bits(struct em28xx *dev, u16 reg, u8 bitmask)
 226 {
 227         int oldval;
 228         u8 newval;
 229
 230         oldval = em28xx_read_reg(dev, reg);
 231         if (oldval < 0)
 232                 return oldval;
 233
 234         newval = (~oldval & bitmask) | (oldval & ~bitmask);
 235
 236         return em28xx_write_reg(dev, reg, newval);
 237 }
 238 EXPORT_SYMBOL_GPL(em28xx_toggle_reg_bits);
 239
 240 /*
 241  * em28xx_is_ac97_ready()
 242  * Checks if ac97 is ready
 243  */
 244 static int em28xx_is_ac97_ready(struct em28xx *dev)
 245 {
 246         unsigned long timeout = jiffies + msecs_to_jiffies(EM28XX_AC97_XFER_TIMEOUT);
 247         int ret;
 248
 249         /* Wait up to 50 ms for AC97 command to complete */
 250         while (time_is_after_jiffies(timeout)) {
 251                 ret = em28xx_read_reg(dev, EM28XX_R43_AC97BUSY);
 252                 if (ret < 0)
 253                         return ret;
 254
 255                 if (!(ret & 0x01))
 256                         return 0;
 257                 msleep(5);
 258         }
 259
 260         dev_warn(&dev->intf->dev,
 261                  "AC97 command still being executed: not handled properly!\n");
 262         return -EBUSY;
 263 }
 264
 265 /*
 266  * em28xx_read_ac97()
 267  * write a 16 bit value to the specified AC97 address (LSB first!)
 268  */
 269 int em28xx_read_ac97(struct em28xx *dev, u8 reg)
 270 {
 271         int ret;
 272         u8 addr = (reg & 0x7f) | 0x80;
 273         __le16 val;
 274
 275         ret = em28xx_is_ac97_ready(dev);
 276         if (ret < 0)
 277                 return ret;
 278
 279         ret = em28xx_write_regs(dev, EM28XX_R42_AC97ADDR, &addr, 1);
 280         if (ret < 0)
 281                 return ret;
 282
 283         ret = dev->em28xx_read_reg_req_len(dev, 0, EM28XX_R40_AC97LSB,
 284                                            (u8 *)&val, sizeof(val));
 285
 286         if (ret < 0)
 287                 return ret;
 288         return le16_to_cpu(val);
 289 }
 290 EXPORT_SYMBOL_GPL(em28xx_read_ac97);
 291
 292 /*
 293  * em28xx_write_ac97()
 294  * write a 16 bit value to the specified AC97 address (LSB first!)
 295  */
 296 int em28xx_write_ac97(struct em28xx *dev, u8 reg, u16 val)
 297 {
 298         int ret;
 299         u8 addr = reg & 0x7f;
 300         __le16 value;
 301
 302         value = cpu_to_le16(val);
 303
 304         ret = em28xx_is_ac97_ready(dev);
 305         if (ret < 0)
 306                 return ret;
 307
 308         ret = em28xx_write_regs(dev, EM28XX_R40_AC97LSB, (u8 *)&value, 2);
 309         if (ret < 0)
 310                 return ret;
 311
 312         ret = em28xx_write_regs(dev, EM28XX_R42_AC97ADDR, &addr, 1);
 313         if (ret < 0)
 314                 return ret;
 315
 316         return 0;
 317 }
 318 EXPORT_SYMBOL_GPL(em28xx_write_ac97);
 319
 320 struct em28xx_vol_itable {
 321         enum em28xx_amux mux;
 322         u8               reg;
 323 };
 324
 325 static struct em28xx_vol_itable inputs[] = {
 326         { EM28XX_AMUX_VIDEO,    AC97_VIDEO      },
 327         { EM28XX_AMUX_LINE_IN,  AC97_LINE       },
 328         { EM28XX_AMUX_PHONE,    AC97_PHONE      },
 329         { EM28XX_AMUX_MIC,      AC97_MIC        },
 330         { EM28XX_AMUX_CD,       AC97_CD         },
 331         { EM28XX_AMUX_AUX,      AC97_AUX        },
 332         { EM28XX_AMUX_PCM_OUT,  AC97_PCM        },
 333 };
 334
 335 static int set_ac97_input(struct em28xx *dev)
 336 {
 337         int ret, i;
 338         enum em28xx_amux amux = dev->ctl_ainput;
 339
 340         /*
 341          * EM28XX_AMUX_VIDEO2 is a special case used to indicate that
 342          * em28xx should point to LINE IN, while AC97 should use VIDEO
 343          */
 344         if (amux == EM28XX_AMUX_VIDEO2)
 345                 amux = EM28XX_AMUX_VIDEO;
 346
 347         /* Mute all entres but the one that were selected */
 348         for (i = 0; i < ARRAY_SIZE(inputs); i++) {
 349                 if (amux == inputs[i].mux)
 350                         ret = em28xx_write_ac97(dev, inputs[i].reg, 0x0808);
 351                 else
 352                         ret = em28xx_write_ac97(dev, inputs[i].reg, 0x8000);
 353
 354                 if (ret < 0)
 355                         dev_warn(&dev->intf->dev,
 356                                  "couldn't setup AC97 register %d\n",
 357                                  inputs[i].reg);
 358         }
 359         return 0;
 360 }
 361
 362 static int em28xx_set_audio_source(struct em28xx *dev)
 363 {
 364         int ret;
 365         u8 input;
 366
 367         if (dev->board.is_em2800) {
 368                 if (dev->ctl_ainput == EM28XX_AMUX_VIDEO)
 369                         input = EM2800_AUDIO_SRC_TUNER;
 370                 else
 371                         input = EM2800_AUDIO_SRC_LINE;
 372
 373                 ret = em28xx_write_regs(dev, EM2800_R08_AUDIOSRC, &input, 1);
 374                 if (ret < 0)
 375                         return ret;
 376         }
 377
 378         if (dev->has_msp34xx) {
 379                 input = EM28XX_AUDIO_SRC_TUNER;
 380         } else {
 381                 switch (dev->ctl_ainput) {
 382                 case EM28XX_AMUX_VIDEO:
 383                         input = EM28XX_AUDIO_SRC_TUNER;
 384                         break;
 385                 default:
 386                         input = EM28XX_AUDIO_SRC_LINE;
 387                         break;
 388                 }
 389         }
 390
 391         if (dev->board.mute_gpio && dev->mute)
 392                 em28xx_gpio_set(dev, dev->board.mute_gpio);
 393         else
 394                 em28xx_gpio_set(dev, INPUT(dev->ctl_input)->gpio);
 395
 396         ret = em28xx_write_reg_bits(dev, EM28XX_R0E_AUDIOSRC, input, 0xc0);
 397         if (ret < 0)
 398                 return ret;
 399         usleep_range(10000, 11000);
 400
 401         switch (dev->audio_mode.ac97) {
 402         case EM28XX_NO_AC97:
 403                 break;
 404         default:
 405                 ret = set_ac97_input(dev);
 406         }
 407
 408         return ret;
 409 }
 410
 411 struct em28xx_vol_otable {
 412         enum em28xx_aout mux;
 413         u8               reg;
 414 };
 415
 416 static const struct em28xx_vol_otable outputs[] = {
 417         { EM28XX_AOUT_MASTER, AC97_MASTER               },
 418         { EM28XX_AOUT_LINE,   AC97_HEADPHONE            },
 419         { EM28XX_AOUT_MONO,   AC97_MASTER_MONO          },
 420         { EM28XX_AOUT_LFE,    AC97_CENTER_LFE_MASTER    },
 421         { EM28XX_AOUT_SURR,   AC97_SURROUND_MASTER      },
 422 };
 423
 424 int em28xx_audio_analog_set(struct em28xx *dev)
 425 {
 426         int ret, i;
 427         u8 xclk;
 428
 429         if (dev->int_audio_type == EM28XX_INT_AUDIO_NONE)
 430                 return 0;
 431
 432         /*
 433          * It is assumed that all devices use master volume for output.
 434          * It would be possible to use also line output.
 435          */
 436         if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
 437                 /* Mute all outputs */
 438                 for (i = 0; i < ARRAY_SIZE(outputs); i++) {
 439                         ret = em28xx_write_ac97(dev, outputs[i].reg, 0x8000);
 440                         if (ret < 0)
 441                                 dev_warn(&dev->intf->dev,
 442                                          "couldn't setup AC97 register %d\n",
 443                                          outputs[i].reg);
 444                 }
 445         }
 446
 447         xclk = dev->board.xclk & 0x7f;
 448         if (!dev->mute)
 449                 xclk |= EM28XX_XCLK_AUDIO_UNMUTE;
 450
 451         ret = em28xx_write_reg(dev, EM28XX_R0F_XCLK, xclk);
 452         if (ret < 0)
 453                 return ret;
 454         usleep_range(10000, 11000);
 455
 456         /* Selects the proper audio input */
 457         ret = em28xx_set_audio_source(dev);
 458
 459         /* Sets volume */
 460         if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
 461                 int vol;
 462
 463                 em28xx_write_ac97(dev, AC97_POWERDOWN, 0x4200);
 464                 em28xx_write_ac97(dev, AC97_EXTENDED_STATUS, 0x0031);
 465                 em28xx_write_ac97(dev, AC97_PCM_LR_ADC_RATE, 0xbb80);
 466
 467                 /* LSB: left channel - both channels with the same level */
 468                 vol = (0x1f - dev->volume) | ((0x1f - dev->volume) << 8);
 469
 470                 /* Mute device, if needed */
 471                 if (dev->mute)
 472                         vol |= 0x8000;
 473
 474                 /* Sets volume */
 475                 for (i = 0; i < ARRAY_SIZE(outputs); i++) {
 476                         if (dev->ctl_aoutput & outputs[i].mux)
 477                                 ret = em28xx_write_ac97(dev, outputs[i].reg,
 478                                                         vol);
 479                         if (ret < 0)
 480                                 dev_warn(&dev->intf->dev,
 481                                          "couldn't setup AC97 register %d\n",
 482                                          outputs[i].reg);
 483                 }
 484
 485                 if (dev->ctl_aoutput & EM28XX_AOUT_PCM_IN) {
 486                         int sel = ac97_return_record_select(dev->ctl_aoutput);
 487
 488                         /*
 489                          * Use the same input for both left and right
 490                          * channels
 491                          */
 492                         sel |= (sel << 8);
 493
 494                         em28xx_write_ac97(dev, AC97_REC_SEL, sel);
 495                 }
 496         }
 497
 498         return ret;
 499 }
 500 EXPORT_SYMBOL_GPL(em28xx_audio_analog_set);
 501
 502 int em28xx_audio_setup(struct em28xx *dev)
 503 {
 504         int vid1, vid2, feat, cfg;
 505         u32 vid = 0;
 506         u8 i2s_samplerates;
 507
 508         if (dev->chip_id == CHIP_ID_EM2870 ||
 509             dev->chip_id == CHIP_ID_EM2874 ||
 510             dev->chip_id == CHIP_ID_EM28174 ||
 511             dev->chip_id == CHIP_ID_EM28178) {
 512                 /* Digital only device - don't load any alsa module */
 513                 dev->int_audio_type = EM28XX_INT_AUDIO_NONE;
 514                 dev->usb_audio_type = EM28XX_USB_AUDIO_NONE;
 515                 return 0;
 516         }
 517
 518         /* See how this device is configured */
 519         cfg = em28xx_read_reg(dev, EM28XX_R00_CHIPCFG);
 520         dev_info(&dev->intf->dev, "Config register raw data: 0x%02x\n", cfg);
 521         if (cfg < 0) { /* Register read error */
 522                 /* Be conservative */
 523                 dev->int_audio_type = EM28XX_INT_AUDIO_AC97;
 524         } else if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) == 0x00) {
 525                 /* The device doesn't have vendor audio at all */
 526                 dev->int_audio_type = EM28XX_INT_AUDIO_NONE;
 527                 dev->usb_audio_type = EM28XX_USB_AUDIO_NONE;
 528                 return 0;
 529         } else if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) != EM28XX_CHIPCFG_AC97) {
 530                 dev->int_audio_type = EM28XX_INT_AUDIO_I2S;
 531                 if (dev->chip_id < CHIP_ID_EM2860 &&
 532                     (cfg & EM28XX_CHIPCFG_AUDIOMASK) ==
 533                     EM2820_CHIPCFG_I2S_1_SAMPRATE)
 534                         i2s_samplerates = 1;
 535                 else if (dev->chip_id >= CHIP_ID_EM2860 &&
 536                          (cfg & EM28XX_CHIPCFG_AUDIOMASK) ==
 537                          EM2860_CHIPCFG_I2S_5_SAMPRATES)
 538                         i2s_samplerates = 5;
 539                 else
 540                         i2s_samplerates = 3;
 541                 dev_info(&dev->intf->dev, "I2S Audio (%d sample rate(s))\n",
 542                          i2s_samplerates);
 543                 /* Skip the code that does AC97 vendor detection */
 544                 dev->audio_mode.ac97 = EM28XX_NO_AC97;
 545                 goto init_audio;
 546         } else {
 547                 dev->int_audio_type = EM28XX_INT_AUDIO_AC97;
 548         }
 549
 550         dev->audio_mode.ac97 = EM28XX_AC97_OTHER;
 551
 552         vid1 = em28xx_read_ac97(dev, AC97_VENDOR_ID1);
 553         if (vid1 < 0) {
 554                 /*
 555                  * Device likely doesn't support AC97
 556                  * Note: (some) em2800 devices without eeprom reports 0x91 on
 557                  *       CHIPCFG register, even not having an AC97 chip
 558                  */
 559                 dev_warn(&dev->intf->dev,
 560                          "AC97 chip type couldn't be determined\n");
 561                 dev->audio_mode.ac97 = EM28XX_NO_AC97;
 562                 if (dev->usb_audio_type == EM28XX_USB_AUDIO_VENDOR)
 563                         dev->usb_audio_type = EM28XX_USB_AUDIO_NONE;
 564                 dev->int_audio_type = EM28XX_INT_AUDIO_NONE;
 565                 goto init_audio;
 566         }
 567
 568         vid2 = em28xx_read_ac97(dev, AC97_VENDOR_ID2);
 569         if (vid2 < 0)
 570                 goto init_audio;
 571
 572         vid = vid1 << 16 | vid2;
 573         dev_warn(&dev->intf->dev, "AC97 vendor ID = 0x%08x\n", vid);
 574
 575         feat = em28xx_read_ac97(dev, AC97_RESET);
 576         if (feat < 0)
 577                 goto init_audio;
 578
 579         dev_warn(&dev->intf->dev, "AC97 features = 0x%04x\n", feat);
 580
 581         /* Try to identify what audio processor we have */
 582         if ((vid == 0xffffffff || vid == 0x83847650) && feat == 0x6a90)
 583                 dev->audio_mode.ac97 = EM28XX_AC97_EM202;
 584         else if ((vid >> 8) == 0x838476)
 585                 dev->audio_mode.ac97 = EM28XX_AC97_SIGMATEL;
 586
 587 init_audio:
 588         /* Reports detected AC97 processor */
 589         switch (dev->audio_mode.ac97) {
 590         case EM28XX_NO_AC97:
 591                 dev_info(&dev->intf->dev, "No AC97 audio processor\n");
 592                 break;
 593         case EM28XX_AC97_EM202:
 594                 dev_info(&dev->intf->dev,
 595                          "Empia 202 AC97 audio processor detected\n");
 596                 break;
 597         case EM28XX_AC97_SIGMATEL:
 598                 dev_info(&dev->intf->dev,
 599                          "Sigmatel audio processor detected (stac 97%02x)\n",
 600                          vid & 0xff);
 601                 break;
 602         case EM28XX_AC97_OTHER:
 603                 dev_warn(&dev->intf->dev,
 604                          "Unknown AC97 audio processor detected!\n");
 605                 break;
 606         default:
 607                 break;
 608         }
 609
 610         return em28xx_audio_analog_set(dev);
 611 }
 612 EXPORT_SYMBOL_GPL(em28xx_audio_setup);
 613
 614 const struct em28xx_led *em28xx_find_led(struct em28xx *dev,
 615                                          enum em28xx_led_role role)
 616 {
 617         if (dev->board.leds) {
 618                 u8 k = 0;
 619
 620                 while (dev->board.leds[k].role >= 0 &&
 621                        dev->board.leds[k].role < EM28XX_NUM_LED_ROLES) {
 622                         if (dev->board.leds[k].role == role)
 623                                 return &dev->board.leds[k];
 624                         k++;
 625                 }
 626         }
 627         return NULL;
 628 }
 629 EXPORT_SYMBOL_GPL(em28xx_find_led);
 630
 631 int em28xx_capture_start(struct em28xx *dev, int start)
 632 {
 633         int rc;
 634         const struct em28xx_led *led = NULL;
 635
 636         if (dev->chip_id == CHIP_ID_EM2874 ||
 637             dev->chip_id == CHIP_ID_EM2884 ||
 638             dev->chip_id == CHIP_ID_EM28174 ||
 639             dev->chip_id == CHIP_ID_EM28178) {
 640                 /* The Transport Stream Enable Register moved in em2874 */
 641                 if (dev->dvb_xfer_bulk) {
 642                         /* Max Tx Size = 188 * 256 = 48128 - LCM(188,512) * 2 */
 643                         em28xx_write_reg(dev, (dev->ts == PRIMARY_TS) ?
 644                                          EM2874_R5D_TS1_PKT_SIZE :
 645                                          EM2874_R5E_TS2_PKT_SIZE,
 646                                          0xff);
 647                 } else {
 648                         /* ISOC Maximum Transfer Size = 188 * 5 */
 649                         em28xx_write_reg(dev, (dev->ts == PRIMARY_TS) ?
 650                                          EM2874_R5D_TS1_PKT_SIZE :
 651                                          EM2874_R5E_TS2_PKT_SIZE,
 652                                          dev->dvb_max_pkt_size_isoc / 188);
 653                 }
 654                 if (dev->ts == PRIMARY_TS)
 655                         rc = em28xx_write_reg_bits(dev,
 656                                                    EM2874_R5F_TS_ENABLE,
 657                                                    start ? EM2874_TS1_CAPTURE_ENABLE : 0x00,
 658                                                    EM2874_TS1_CAPTURE_ENABLE);
 659                 else
 660                         rc = em28xx_write_reg_bits(dev,
 661                                                    EM2874_R5F_TS_ENABLE,
 662                                                    start ? EM2874_TS2_CAPTURE_ENABLE : 0x00,
 663                                                    EM2874_TS2_CAPTURE_ENABLE);
 664         } else {
 665                 /* FIXME: which is the best order? */
 666                 /* video registers are sampled by VREF */
 667                 rc = em28xx_write_reg_bits(dev, EM28XX_R0C_USBSUSP,
 668                                            start ? 0x10 : 0x00, 0x10);
 669                 if (rc < 0)
 670                         return rc;
 671
 672                 if (start) {
 673                         if (dev->is_webcam)
 674                                 rc = em28xx_write_reg(dev, 0x13, 0x0c);
 675
 676                         /* Enable video capture */
 677                         rc = em28xx_write_reg(dev, 0x48, 0x00);
 678                         if (rc < 0)
 679                                 return rc;
 680
 681                         if (dev->mode == EM28XX_ANALOG_MODE)
 682                                 rc = em28xx_write_reg(dev,
 683                                                       EM28XX_R12_VINENABLE,
 684                                                       0x67);
 685                         else
 686                                 rc = em28xx_write_reg(dev,
 687                                                       EM28XX_R12_VINENABLE,
 688                                                       0x37);
 689                         if (rc < 0)
 690                                 return rc;
 691
 692                         usleep_range(10000, 11000);
 693                 } else {
 694                         /* disable video capture */
 695                         rc = em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x27);
 696                 }
 697         }
 698
 699         if (dev->mode == EM28XX_ANALOG_MODE)
 700                 led = em28xx_find_led(dev, EM28XX_LED_ANALOG_CAPTURING);
 701         else
 702                 led = em28xx_find_led(dev, EM28XX_LED_DIGITAL_CAPTURING);
 703
 704         if (led)
 705                 em28xx_write_reg_bits(dev, led->gpio_reg,
 706                                       (!start ^ led->inverted) ?
 707                                       ~led->gpio_mask : led->gpio_mask,
 708                                       led->gpio_mask);
 709
 710         return rc;
 711 }
 712
 713 int em28xx_gpio_set(struct em28xx *dev, const struct em28xx_reg_seq *gpio)
 714 {
 715         int rc = 0;
 716
 717         if (!gpio)
 718                 return rc;
 719
 720         if (dev->mode != EM28XX_SUSPEND) {
 721                 em28xx_write_reg(dev, 0x48, 0x00);
 722                 if (dev->mode == EM28XX_ANALOG_MODE)
 723                         em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x67);
 724                 else
 725                         em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x37);
 726                 usleep_range(10000, 11000);
 727         }
 728
 729         /* Send GPIO reset sequences specified at board entry */
 730         while (gpio->sleep >= 0) {
 731                 if (gpio->reg >= 0) {
 732                         rc = em28xx_write_reg_bits(dev,
 733                                                    gpio->reg,
 734                                                    gpio->val,
 735                                                    gpio->mask);
 736                         if (rc < 0)
 737                                 return rc;
 738                 }
 739                 if (gpio->sleep > 0)
 740                         msleep(gpio->sleep);
 741
 742                 gpio++;
 743         }
 744         return rc;
 745 }
 746 EXPORT_SYMBOL_GPL(em28xx_gpio_set);
 747
 748 int em28xx_set_mode(struct em28xx *dev, enum em28xx_mode set_mode)
 749 {
 750         if (dev->mode == set_mode)
 751                 return 0;
 752
 753         if (set_mode == EM28XX_SUSPEND) {
 754                 dev->mode = set_mode;
 755
 756                 /* FIXME: add suspend support for ac97 */
 757
 758                 return em28xx_gpio_set(dev, dev->board.suspend_gpio);
 759         }
 760
 761         dev->mode = set_mode;
 762
 763         if (dev->mode == EM28XX_DIGITAL_MODE)
 764                 return em28xx_gpio_set(dev, dev->board.dvb_gpio);
 765         else
 766                 return em28xx_gpio_set(dev, INPUT(dev->ctl_input)->gpio);
 767 }
 768 EXPORT_SYMBOL_GPL(em28xx_set_mode);
 769
 770 /*
 771  *URB control
 772  */
 773
 774 /*
 775  * URB completion handler for isoc/bulk transfers
 776  */
 777 static void em28xx_irq_callback(struct urb *urb)
 778 {
 779         struct em28xx *dev = urb->context;
 780         int i;
 781
 782         switch (urb->status) {
 783         case 0:             /* success */
 784         case -ETIMEDOUT:    /* NAK */
 785                 break;
 786         case -ECONNRESET:   /* kill */
 787         case -ENOENT:
 788         case -ESHUTDOWN:
 789                 return;
 790         default:            /* error */
 791                 em28xx_isocdbg("urb completion error %d.\n", urb->status);
 792                 break;
 793         }
 794
 795         /* Copy data from URB */
 796         spin_lock(&dev->slock);
 797         dev->usb_ctl.urb_data_copy(dev, urb);
 798         spin_unlock(&dev->slock);
 799
 800         /* Reset urb buffers */
 801         for (i = 0; i < urb->number_of_packets; i++) {
 802                 /* isoc only (bulk: number_of_packets = 0) */
 803                 urb->iso_frame_desc[i].status = 0;
 804                 urb->iso_frame_desc[i].actual_length = 0;
 805         }
 806         urb->status = 0;
 807
 808         urb->status = usb_submit_urb(urb, GFP_ATOMIC);
 809         if (urb->status) {
 810                 em28xx_isocdbg("urb resubmit failed (error=%i)\n",
 811                                urb->status);
 812         }
 813 }
 814
 815 /*
 816  * Stop and Deallocate URBs
 817  */
 818 void em28xx_uninit_usb_xfer(struct em28xx *dev, enum em28xx_mode mode)
 819 {
 820         struct urb *urb;
 821         struct em28xx_usb_bufs *usb_bufs;
 822         int i;
 823
 824         em28xx_isocdbg("called %s in mode %d\n", __func__, mode);
 825
 826         if (mode == EM28XX_DIGITAL_MODE)
 827                 usb_bufs = &dev->usb_ctl.digital_bufs;
 828         else
 829                 usb_bufs = &dev->usb_ctl.analog_bufs;
 830
 831         for (i = 0; i < usb_bufs->num_bufs; i++) {
 832                 urb = usb_bufs->urb[i];
 833                 if (urb) {
 834                         if (!irqs_disabled())
 835                                 usb_kill_urb(urb);
 836                         else
 837                                 usb_unlink_urb(urb);
 838
 839                         usb_free_urb(urb);
 840                         usb_bufs->urb[i] = NULL;
 841                 }
 842         }
 843
 844         kfree(usb_bufs->urb);
 845         kfree(usb_bufs->buf);
 846
 847         usb_bufs->urb = NULL;
 848         usb_bufs->buf = NULL;
 849         usb_bufs->num_bufs = 0;
 850
 851         em28xx_capture_start(dev, 0);
 852 }
 853 EXPORT_SYMBOL_GPL(em28xx_uninit_usb_xfer);
 854
 855 /*
 856  * Stop URBs
 857  */
 858 void em28xx_stop_urbs(struct em28xx *dev)
 859 {
 860         int i;
 861         struct urb *urb;
 862         struct em28xx_usb_bufs *isoc_bufs = &dev->usb_ctl.digital_bufs;
 863
 864         em28xx_isocdbg("called %s\n", __func__);
 865
 866         for (i = 0; i < isoc_bufs->num_bufs; i++) {
 867                 urb = isoc_bufs->urb[i];
 868                 if (urb) {
 869                         if (!irqs_disabled())
 870                                 usb_kill_urb(urb);
 871                         else
 872                                 usb_unlink_urb(urb);
 873                 }
 874         }
 875
 876         em28xx_capture_start(dev, 0);
 877 }
 878 EXPORT_SYMBOL_GPL(em28xx_stop_urbs);
 879
 880 /*
 881  * Allocate URBs
 882  */
 883 int em28xx_alloc_urbs(struct em28xx *dev, enum em28xx_mode mode, int xfer_bulk,
 884                       int num_bufs, int max_pkt_size, int packet_multiplier)
 885 {
 886         struct em28xx_usb_bufs *usb_bufs;
 887         struct urb *urb;
 888         struct usb_device *udev = interface_to_usbdev(dev->intf);
 889         int i;
 890         int sb_size, pipe;
 891         int j, k;
 892
 893         em28xx_isocdbg("em28xx: called %s in mode %d\n", __func__, mode);
 894
 895         /*
 896          * Check mode and if we have an endpoint for the selected
 897          * transfer type, select buffer
 898          */
 899         if (mode == EM28XX_DIGITAL_MODE) {
 900                 if ((xfer_bulk && !dev->dvb_ep_bulk) ||
 901                     (!xfer_bulk && !dev->dvb_ep_isoc)) {
 902                         dev_err(&dev->intf->dev,
 903                                 "no endpoint for DVB mode and transfer type %d\n",
 904                                 xfer_bulk > 0);
 905                         return -EINVAL;
 906                 }
 907                 usb_bufs = &dev->usb_ctl.digital_bufs;
 908         } else if (mode == EM28XX_ANALOG_MODE) {
 909                 if ((xfer_bulk && !dev->analog_ep_bulk) ||
 910                     (!xfer_bulk && !dev->analog_ep_isoc)) {
 911                         dev_err(&dev->intf->dev,
 912                                 "no endpoint for analog mode and transfer type %d\n",
 913                                 xfer_bulk > 0);
 914                         return -EINVAL;
 915                 }
 916                 usb_bufs = &dev->usb_ctl.analog_bufs;
 917         } else {
 918                 dev_err(&dev->intf->dev, "invalid mode selected\n");
 919                 return -EINVAL;
 920         }
 921
 922         /* De-allocates all pending stuff */
 923         em28xx_uninit_usb_xfer(dev, mode);
 924
 925         usb_bufs->num_bufs = num_bufs;
 926
 927         usb_bufs->urb = kcalloc(num_bufs, sizeof(void *), GFP_KERNEL);
 928         if (!usb_bufs->urb)
 929                 return -ENOMEM;
 930
 931         usb_bufs->buf = kcalloc(num_bufs, sizeof(void *), GFP_KERNEL);
 932         if (!usb_bufs->buf) {
 933                 kfree(usb_bufs->buf);
 934                 return -ENOMEM;
 935         }
 936
 937         usb_bufs->max_pkt_size = max_pkt_size;
 938         if (xfer_bulk)
 939                 usb_bufs->num_packets = 0;
 940         else
 941                 usb_bufs->num_packets = packet_multiplier;
 942         dev->usb_ctl.vid_buf = NULL;
 943         dev->usb_ctl.vbi_buf = NULL;
 944
 945         sb_size = packet_multiplier * usb_bufs->max_pkt_size;
 946
 947         /* allocate urbs and transfer buffers */
 948         for (i = 0; i < usb_bufs->num_bufs; i++) {
 949                 urb = usb_alloc_urb(usb_bufs->num_packets, GFP_KERNEL);
 950                 if (!urb) {
 951                         em28xx_uninit_usb_xfer(dev, mode);
 952                         return -ENOMEM;
 953                 }
 954                 usb_bufs->urb[i] = urb;
 955
 956                 usb_bufs->buf[i] = kzalloc(sb_size, GFP_KERNEL);
 957                 if (!usb_bufs->buf[i]) {
 958                         em28xx_uninit_usb_xfer(dev, mode);
 959
 960                         for (i--; i >= 0; i--)
 961                                 kfree(usb_bufs->buf[i]);
 962
 963                         kfree(usb_bufs->buf);
 964                         usb_bufs->buf = NULL;
 965
 966                         return -ENOMEM;
 967                 }
 968
 969                 urb->transfer_flags = URB_FREE_BUFFER;
 970
 971                 if (xfer_bulk) { /* bulk */
 972                         pipe = usb_rcvbulkpipe(udev,
 973                                                mode == EM28XX_ANALOG_MODE ?
 974                                                dev->analog_ep_bulk :
 975                                                dev->dvb_ep_bulk);
 976                         usb_fill_bulk_urb(urb, udev, pipe, usb_bufs->buf[i],
 977                                           sb_size, em28xx_irq_callback, dev);
 978                 } else { /* isoc */
 979                         pipe = usb_rcvisocpipe(udev,
 980                                                mode == EM28XX_ANALOG_MODE ?
 981                                                dev->analog_ep_isoc :
 982                                                dev->dvb_ep_isoc);
 983                         usb_fill_int_urb(urb, udev, pipe, usb_bufs->buf[i],
 984                                          sb_size, em28xx_irq_callback, dev, 1);
 985                         urb->transfer_flags |= URB_ISO_ASAP;
 986                         k = 0;
 987                         for (j = 0; j < usb_bufs->num_packets; j++) {
 988                                 urb->iso_frame_desc[j].offset = k;
 989                                 urb->iso_frame_desc[j].length =
 990                                                         usb_bufs->max_pkt_size;
 991                                 k += usb_bufs->max_pkt_size;
 992                         }
 993                 }
 994
 995                 urb->number_of_packets = usb_bufs->num_packets;
 996         }
 997
 998         return 0;
 999 }
1000 EXPORT_SYMBOL_GPL(em28xx_alloc_urbs);
1001
1002 /*
1003  * Allocate URBs and start IRQ
1004  */
1005 int em28xx_init_usb_xfer(struct em28xx *dev, enum em28xx_mode mode,
1006                          int xfer_bulk, int num_bufs, int max_pkt_size,
1007                     int packet_multiplier,
1008                     int (*urb_data_copy)(struct em28xx *dev, struct urb *urb))
1009 {
1010         struct em28xx_dmaqueue *dma_q = &dev->vidq;
1011         struct em28xx_dmaqueue *vbi_dma_q = &dev->vbiq;
1012         struct em28xx_usb_bufs *usb_bufs;
1013         struct usb_device *udev = interface_to_usbdev(dev->intf);
1014         int i;
1015         int rc;
1016         int alloc;
1017
1018         em28xx_isocdbg("em28xx: called %s in mode %d\n", __func__, mode);
1019
1020         dev->usb_ctl.urb_data_copy = urb_data_copy;
1021
1022         if (mode == EM28XX_DIGITAL_MODE) {
1023                 usb_bufs = &dev->usb_ctl.digital_bufs;
1024                 /* no need to free/alloc usb buffers in digital mode */
1025                 alloc = 0;
1026         } else {
1027                 usb_bufs = &dev->usb_ctl.analog_bufs;
1028                 alloc = 1;
1029         }
1030
1031         if (alloc) {
1032                 rc = em28xx_alloc_urbs(dev, mode, xfer_bulk, num_bufs,
1033                                        max_pkt_size, packet_multiplier);
1034                 if (rc)
1035                         return rc;
1036         }
1037
1038         if (xfer_bulk) {
1039                 rc = usb_clear_halt(udev, usb_bufs->urb[0]->pipe);
1040                 if (rc < 0) {
1041                         dev_err(&dev->intf->dev,
1042                                 "failed to clear USB bulk endpoint stall/halt condition (error=%i)\n",
1043                                rc);
1044                         em28xx_uninit_usb_xfer(dev, mode);
1045                         return rc;
1046                 }
1047         }
1048
1049         init_waitqueue_head(&dma_q->wq);
1050         init_waitqueue_head(&vbi_dma_q->wq);
1051
1052         em28xx_capture_start(dev, 1);
1053
1054         /* submit urbs and enables IRQ */
1055         for (i = 0; i < usb_bufs->num_bufs; i++) {
1056                 rc = usb_submit_urb(usb_bufs->urb[i], GFP_ATOMIC);
1057                 if (rc) {
1058                         dev_err(&dev->intf->dev,
1059                                 "submit of urb %i failed (error=%i)\n", i, rc);
1060                         em28xx_uninit_usb_xfer(dev, mode);
1061                         return rc;
1062                 }
1063         }
1064
1065         return 0;
1066 }
1067 EXPORT_SYMBOL_GPL(em28xx_init_usb_xfer);
1068
1069 /*
1070  * Device control list
1071  */
1072
1073 static LIST_HEAD(em28xx_devlist);
1074 static DEFINE_MUTEX(em28xx_devlist_mutex);
1075
1076 /*
1077  * Extension interface
1078  */
1079
1080 static LIST_HEAD(em28xx_extension_devlist);
1081
1082 int em28xx_register_extension(struct em28xx_ops *ops)
1083 {
1084         struct em28xx *dev = NULL;
1085
1086         mutex_lock(&em28xx_devlist_mutex);
1087         list_add_tail(&ops->next, &em28xx_extension_devlist);
1088         list_for_each_entry(dev, &em28xx_devlist, devlist) {
1089                 if (ops->init) {
1090                         ops->init(dev);
1091                         if (dev->dev_next)
1092                                 ops->init(dev->dev_next);
1093                 }
1094         }
1095         mutex_unlock(&em28xx_devlist_mutex);
1096         pr_info("em28xx: Registered (%s) extension\n", ops->name);
1097         return 0;
1098 }
1099 EXPORT_SYMBOL(em28xx_register_extension);
1100
1101 void em28xx_unregister_extension(struct em28xx_ops *ops)
1102 {
1103         struct em28xx *dev = NULL;
1104
1105         mutex_lock(&em28xx_devlist_mutex);
1106         list_for_each_entry(dev, &em28xx_devlist, devlist) {
1107                 if (ops->fini) {
1108                         if (dev->dev_next)
1109                                 ops->fini(dev->dev_next);
1110                         ops->fini(dev);
1111                 }
1112         }
1113         list_del(&ops->next);
1114         mutex_unlock(&em28xx_devlist_mutex);
1115         pr_info("em28xx: Removed (%s) extension\n", ops->name);
1116 }
1117 EXPORT_SYMBOL(em28xx_unregister_extension);
1118
1119 void em28xx_init_extension(struct em28xx *dev)
1120 {
1121         const struct em28xx_ops *ops = NULL;
1122
1123         mutex_lock(&em28xx_devlist_mutex);
1124         list_add_tail(&dev->devlist, &em28xx_devlist);
1125         list_for_each_entry(ops, &em28xx_extension_devlist, next) {
1126                 if (ops->init) {
1127                         ops->init(dev);
1128                         if (dev->dev_next)
1129                                 ops->init(dev->dev_next);
1130                 }
1131         }
1132         mutex_unlock(&em28xx_devlist_mutex);
1133 }
1134
1135 void em28xx_close_extension(struct em28xx *dev)
1136 {
1137         const struct em28xx_ops *ops = NULL;
1138
1139         mutex_lock(&em28xx_devlist_mutex);
1140         list_for_each_entry(ops, &em28xx_extension_devlist, next) {
1141                 if (ops->fini) {
1142                         if (dev->dev_next)
1143                                 ops->fini(dev->dev_next);
1144                         ops->fini(dev);
1145                 }
1146         }
1147         list_del(&dev->devlist);
1148         mutex_unlock(&em28xx_devlist_mutex);
1149 }
1150
1151 int em28xx_suspend_extension(struct em28xx *dev)
1152 {
1153         const struct em28xx_ops *ops = NULL;
1154
1155         dev_info(&dev->intf->dev, "Suspending extensions\n");
1156         mutex_lock(&em28xx_devlist_mutex);
1157         list_for_each_entry(ops, &em28xx_extension_devlist, next) {
1158                 if (ops->suspend)
1159                         ops->suspend(dev);
1160                 if (dev->dev_next)
1161                         ops->suspend(dev->dev_next);
1162         }
1163         mutex_unlock(&em28xx_devlist_mutex);
1164         return 0;
1165 }
1166
1167 int em28xx_resume_extension(struct em28xx *dev)
1168 {
1169         const struct em28xx_ops *ops = NULL;
1170
1171         dev_info(&dev->intf->dev, "Resuming extensions\n");
1172         mutex_lock(&em28xx_devlist_mutex);
1173         list_for_each_entry(ops, &em28xx_extension_devlist, next) {
1174                 if (ops->resume)
1175                         ops->resume(dev);
1176                 if (dev->dev_next)
1177                         ops->resume(dev->dev_next);
1178         }
1179         mutex_unlock(&em28xx_devlist_mutex);
1180         return 0;
1181 }