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

   1 /*
   2    em28xx-core.c - driver for Empia EM2800/EM2820/2840 USB video capture devices
   3
   4    Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
   5                       Markus Rechberger <mrechberger@gmail.com>
   6                       Mauro Carvalho Chehab <mchehab@infradead.org>
   7                       Sascha Sommer <saschasommer@freenet.de>
   8    Copyright (C) 2012 Frank Schäfer <fschaefer.oss@googlemail.com>
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 2 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program; if not, write to the Free Software
  22    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23  */
  24
  25 #include <linux/init.h>
  26 #include <linux/jiffies.h>
  27 #include <linux/list.h>
  28 #include <linux/module.h>
  29 #include <linux/slab.h>
  30 #include <linux/usb.h>
  31 #include <linux/vmalloc.h>
  32 #include <sound/ac97_codec.h>
  33 #include <media/v4l2-common.h>
  34
  35 #include "em28xx.h"
  36
  37 #define DRIVER_AUTHOR "Ludovico Cavedon <cavedon@sssup.it>, " \
  38                       "Markus Rechberger <mrechberger@gmail.com>, " \
  39                       "Mauro Carvalho Chehab <mchehab@infradead.org>, " \
  40                       "Sascha Sommer <saschasommer@freenet.de>"
  41
  42 MODULE_AUTHOR(DRIVER_AUTHOR);
  43 MODULE_DESCRIPTION(DRIVER_DESC);
  44 MODULE_LICENSE("GPL");
  45 MODULE_VERSION(EM28XX_VERSION);
  46
  47 /* #define ENABLE_DEBUG_ISOC_FRAMES */
  48
  49 static unsigned int core_debug;
  50 module_param(core_debug, int, 0644);
  51 MODULE_PARM_DESC(core_debug, "enable debug messages [core]");
  52
  53 #define em28xx_coredbg(fmt, arg...) do {\
  54         if (core_debug) \
  55                 printk(KERN_INFO "%s %s :"fmt, \
  56                          dev->name, __func__ , ##arg); } while (0)
  57
  58 static unsigned int reg_debug;
  59 module_param(reg_debug, int, 0644);
  60 MODULE_PARM_DESC(reg_debug, "enable debug messages [URB reg]");
  61
  62 #define em28xx_regdbg(fmt, arg...) do {\
  63         if (reg_debug) \
  64                 printk(KERN_INFO "%s %s :"fmt, \
  65                          dev->name, __func__ , ##arg); } while (0)
  66
  67 /* FIXME */
  68 #define em28xx_isocdbg(fmt, arg...) do {\
  69         if (core_debug) \
  70                 printk(KERN_INFO "%s %s :"fmt, \
  71                          dev->name, __func__ , ##arg); } while (0)
  72
  73 /*
  74  * em28xx_read_reg_req()
  75  * reads data from the usb device specifying bRequest
  76  */
  77 int em28xx_read_reg_req_len(struct em28xx *dev, u8 req, u16 reg,
  78                             char *buf, int len)
  79 {
  80         int ret;
  81         int pipe = usb_rcvctrlpipe(dev->udev, 0);
  82
  83         if (dev->disconnected)
  84                 return -ENODEV;
  85
  86         if (len > URB_MAX_CTRL_SIZE)
  87                 return -EINVAL;
  88
  89         if (reg_debug) {
  90                 printk(KERN_DEBUG "(pipe 0x%08x): "
  91                         "IN:  %02x %02x %02x %02x %02x %02x %02x %02x ",
  92                         pipe,
  93                         USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  94                         req, 0, 0,
  95                         reg & 0xff, reg >> 8,
  96                         len & 0xff, len >> 8);
  97         }
  98
  99         mutex_lock(&dev->ctrl_urb_lock);
 100         ret = usb_control_msg(dev->udev, pipe, req,
 101                               USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 102                               0x0000, reg, dev->urb_buf, len, HZ);
 103         if (ret < 0) {
 104                 if (reg_debug)
 105                         printk(" failed!\n");
 106                 mutex_unlock(&dev->ctrl_urb_lock);
 107                 return usb_translate_errors(ret);
 108         }
 109
 110         if (len)
 111                 memcpy(buf, dev->urb_buf, len);
 112
 113         mutex_unlock(&dev->ctrl_urb_lock);
 114
 115         if (reg_debug) {
 116                 int byte;
 117
 118                 printk("<<<");
 119                 for (byte = 0; byte < len; byte++)
 120                         printk(" %02x", (unsigned char)buf[byte]);
 121                 printk("\n");
 122         }
 123
 124         return ret;
 125 }
 126
 127 /*
 128  * em28xx_read_reg_req()
 129  * reads data from the usb device specifying bRequest
 130  */
 131 int em28xx_read_reg_req(struct em28xx *dev, u8 req, u16 reg)
 132 {
 133         int ret;
 134         u8 val;
 135
 136         ret = em28xx_read_reg_req_len(dev, req, reg, &val, 1);
 137         if (ret < 0)
 138                 return ret;
 139
 140         return val;
 141 }
 142
 143 int em28xx_read_reg(struct em28xx *dev, u16 reg)
 144 {
 145         return em28xx_read_reg_req(dev, USB_REQ_GET_STATUS, reg);
 146 }
 147 EXPORT_SYMBOL_GPL(em28xx_read_reg);
 148
 149 /*
 150  * em28xx_write_regs_req()
 151  * sends data to the usb device, specifying bRequest
 152  */
 153 int em28xx_write_regs_req(struct em28xx *dev, u8 req, u16 reg, char *buf,
 154                           int len)
 155 {
 156         int ret;
 157         int pipe = usb_sndctrlpipe(dev->udev, 0);
 158
 159         if (dev->disconnected)
 160                 return -ENODEV;
 161
 162         if ((len < 1) || (len > URB_MAX_CTRL_SIZE))
 163                 return -EINVAL;
 164
 165         if (reg_debug) {
 166                 int byte;
 167
 168                 printk(KERN_DEBUG "(pipe 0x%08x): "
 169                         "OUT: %02x %02x %02x %02x %02x %02x %02x %02x >>>",
 170                         pipe,
 171                         USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 172                         req, 0, 0,
 173                         reg & 0xff, reg >> 8,
 174                         len & 0xff, len >> 8);
 175
 176                 for (byte = 0; byte < len; byte++)
 177                         printk(" %02x", (unsigned char)buf[byte]);
 178                 printk("\n");
 179         }
 180
 181         mutex_lock(&dev->ctrl_urb_lock);
 182         memcpy(dev->urb_buf, buf, len);
 183         ret = usb_control_msg(dev->udev, pipe, req,
 184                               USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 185                               0x0000, reg, dev->urb_buf, len, HZ);
 186         mutex_unlock(&dev->ctrl_urb_lock);
 187
 188         if (ret < 0)
 189                 return usb_translate_errors(ret);
 190
 191         if (dev->wait_after_write)
 192                 msleep(dev->wait_after_write);
 193
 194         return ret;
 195 }
 196
 197 int em28xx_write_regs(struct em28xx *dev, u16 reg, char *buf, int len)
 198 {
 199         return em28xx_write_regs_req(dev, USB_REQ_GET_STATUS, reg, buf, len);
 200 }
 201 EXPORT_SYMBOL_GPL(em28xx_write_regs);
 202
 203 /* Write a single register */
 204 int em28xx_write_reg(struct em28xx *dev, u16 reg, u8 val)
 205 {
 206         return em28xx_write_regs(dev, reg, &val, 1);
 207 }
 208 EXPORT_SYMBOL_GPL(em28xx_write_reg);
 209
 210 /*
 211  * em28xx_write_reg_bits()
 212  * sets only some bits (specified by bitmask) of a register, by first reading
 213  * the actual value
 214  */
 215 int em28xx_write_reg_bits(struct em28xx *dev, u16 reg, u8 val,
 216                           u8 bitmask)
 217 {
 218         int oldval;
 219         u8 newval;
 220
 221         oldval = em28xx_read_reg(dev, reg);
 222         if (oldval < 0)
 223                 return oldval;
 224
 225         newval = (((u8)oldval) & ~bitmask) | (val & bitmask);
 226
 227         return em28xx_write_regs(dev, reg, &newval, 1);
 228 }
 229 EXPORT_SYMBOL_GPL(em28xx_write_reg_bits);
 230
 231 /*
 232  * em28xx_toggle_reg_bits()
 233  * toggles/inverts the bits (specified by bitmask) of a register
 234  */
 235 int em28xx_toggle_reg_bits(struct em28xx *dev, u16 reg, u8 bitmask)
 236 {
 237         int oldval;
 238         u8 newval;
 239
 240         oldval = em28xx_read_reg(dev, reg);
 241         if (oldval < 0)
 242                 return oldval;
 243
 244         newval = (~oldval & bitmask) | (oldval & ~bitmask);
 245
 246         return em28xx_write_reg(dev, reg, newval);
 247 }
 248 EXPORT_SYMBOL_GPL(em28xx_toggle_reg_bits);
 249
 250 /*
 251  * em28xx_is_ac97_ready()
 252  * Checks if ac97 is ready
 253  */
 254 static int em28xx_is_ac97_ready(struct em28xx *dev)
 255 {
 256         unsigned long timeout = jiffies + msecs_to_jiffies(EM28XX_AC97_XFER_TIMEOUT);
 257         int ret;
 258
 259         /* Wait up to 50 ms for AC97 command to complete */
 260         while (time_is_after_jiffies(timeout)) {
 261                 ret = em28xx_read_reg(dev, EM28XX_R43_AC97BUSY);
 262                 if (ret < 0)
 263                         return ret;
 264
 265                 if (!(ret & 0x01))
 266                         return 0;
 267                 msleep(5);
 268         }
 269
 270         em28xx_warn("AC97 command still being executed: not handled properly!\n");
 271         return -EBUSY;
 272 }
 273
 274 /*
 275  * em28xx_read_ac97()
 276  * write a 16 bit value to the specified AC97 address (LSB first!)
 277  */
 278 int em28xx_read_ac97(struct em28xx *dev, u8 reg)
 279 {
 280         int ret;
 281         u8 addr = (reg & 0x7f) | 0x80;
 282         __le16 val;
 283
 284         ret = em28xx_is_ac97_ready(dev);
 285         if (ret < 0)
 286                 return ret;
 287
 288         ret = em28xx_write_regs(dev, EM28XX_R42_AC97ADDR, &addr, 1);
 289         if (ret < 0)
 290                 return ret;
 291
 292         ret = dev->em28xx_read_reg_req_len(dev, 0, EM28XX_R40_AC97LSB,
 293                                            (u8 *)&val, sizeof(val));
 294
 295         if (ret < 0)
 296                 return ret;
 297         return le16_to_cpu(val);
 298 }
 299 EXPORT_SYMBOL_GPL(em28xx_read_ac97);
 300
 301 /*
 302  * em28xx_write_ac97()
 303  * write a 16 bit value to the specified AC97 address (LSB first!)
 304  */
 305 int em28xx_write_ac97(struct em28xx *dev, u8 reg, u16 val)
 306 {
 307         int ret;
 308         u8 addr = reg & 0x7f;
 309         __le16 value;
 310
 311         value = cpu_to_le16(val);
 312
 313         ret = em28xx_is_ac97_ready(dev);
 314         if (ret < 0)
 315                 return ret;
 316
 317         ret = em28xx_write_regs(dev, EM28XX_R40_AC97LSB, (u8 *)&value, 2);
 318         if (ret < 0)
 319                 return ret;
 320
 321         ret = em28xx_write_regs(dev, EM28XX_R42_AC97ADDR, &addr, 1);
 322         if (ret < 0)
 323                 return ret;
 324
 325         return 0;
 326 }
 327 EXPORT_SYMBOL_GPL(em28xx_write_ac97);
 328
 329 struct em28xx_vol_itable {
 330         enum em28xx_amux mux;
 331         u8               reg;
 332 };
 333
 334 static struct em28xx_vol_itable inputs[] = {
 335         { EM28XX_AMUX_VIDEO,    AC97_VIDEO      },
 336         { EM28XX_AMUX_LINE_IN,  AC97_LINE       },
 337         { EM28XX_AMUX_PHONE,    AC97_PHONE      },
 338         { EM28XX_AMUX_MIC,      AC97_MIC        },
 339         { EM28XX_AMUX_CD,       AC97_CD         },
 340         { EM28XX_AMUX_AUX,      AC97_AUX        },
 341         { EM28XX_AMUX_PCM_OUT,  AC97_PCM        },
 342 };
 343
 344 static int set_ac97_input(struct em28xx *dev)
 345 {
 346         int ret, i;
 347         enum em28xx_amux amux = dev->ctl_ainput;
 348
 349         /* EM28XX_AMUX_VIDEO2 is a special case used to indicate that
 350            em28xx should point to LINE IN, while AC97 should use VIDEO
 351          */
 352         if (amux == EM28XX_AMUX_VIDEO2)
 353                 amux = EM28XX_AMUX_VIDEO;
 354
 355         /* Mute all entres but the one that were selected */
 356         for (i = 0; i < ARRAY_SIZE(inputs); i++) {
 357                 if (amux == inputs[i].mux)
 358                         ret = em28xx_write_ac97(dev, inputs[i].reg, 0x0808);
 359                 else
 360                         ret = em28xx_write_ac97(dev, inputs[i].reg, 0x8000);
 361
 362                 if (ret < 0)
 363                         em28xx_warn("couldn't setup AC97 register %d\n",
 364                                     inputs[i].reg);
 365         }
 366         return 0;
 367 }
 368
 369 static int em28xx_set_audio_source(struct em28xx *dev)
 370 {
 371         int ret;
 372         u8 input;
 373
 374         if (dev->board.is_em2800) {
 375                 if (dev->ctl_ainput == EM28XX_AMUX_VIDEO)
 376                         input = EM2800_AUDIO_SRC_TUNER;
 377                 else
 378                         input = EM2800_AUDIO_SRC_LINE;
 379
 380                 ret = em28xx_write_regs(dev, EM2800_R08_AUDIOSRC, &input, 1);
 381                 if (ret < 0)
 382                         return ret;
 383         }
 384
 385         if (dev->board.has_msp34xx)
 386                 input = EM28XX_AUDIO_SRC_TUNER;
 387         else {
 388                 switch (dev->ctl_ainput) {
 389                 case EM28XX_AMUX_VIDEO:
 390                         input = EM28XX_AUDIO_SRC_TUNER;
 391                         break;
 392                 default:
 393                         input = EM28XX_AUDIO_SRC_LINE;
 394                         break;
 395                 }
 396         }
 397
 398         if (dev->board.mute_gpio && dev->mute)
 399                 em28xx_gpio_set(dev, dev->board.mute_gpio);
 400         else
 401                 em28xx_gpio_set(dev, INPUT(dev->ctl_input)->gpio);
 402
 403         ret = em28xx_write_reg_bits(dev, EM28XX_R0E_AUDIOSRC, input, 0xc0);
 404         if (ret < 0)
 405                 return ret;
 406         msleep(5);
 407
 408         switch (dev->audio_mode.ac97) {
 409         case EM28XX_NO_AC97:
 410                 break;
 411         default:
 412                 ret = set_ac97_input(dev);
 413         }
 414
 415         return ret;
 416 }
 417
 418 struct em28xx_vol_otable {
 419         enum em28xx_aout mux;
 420         u8               reg;
 421 };
 422
 423 static const struct em28xx_vol_otable outputs[] = {
 424         { EM28XX_AOUT_MASTER, AC97_MASTER               },
 425         { EM28XX_AOUT_LINE,   AC97_HEADPHONE            },
 426         { EM28XX_AOUT_MONO,   AC97_MASTER_MONO          },
 427         { EM28XX_AOUT_LFE,    AC97_CENTER_LFE_MASTER    },
 428         { EM28XX_AOUT_SURR,   AC97_SURROUND_MASTER      },
 429 };
 430
 431 int em28xx_audio_analog_set(struct em28xx *dev)
 432 {
 433         int ret, i;
 434         u8 xclk;
 435
 436         if (dev->int_audio_type == EM28XX_INT_AUDIO_NONE)
 437                 return 0;
 438
 439         /* It is assumed that all devices use master volume for output.
 440            It would be possible to use also line output.
 441          */
 442         if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
 443                 /* Mute all outputs */
 444                 for (i = 0; i < ARRAY_SIZE(outputs); i++) {
 445                         ret = em28xx_write_ac97(dev, outputs[i].reg, 0x8000);
 446                         if (ret < 0)
 447                                 em28xx_warn("couldn't setup AC97 register %d\n",
 448                                             outputs[i].reg);
 449                 }
 450         }
 451
 452         xclk = dev->board.xclk & 0x7f;
 453         if (!dev->mute)
 454                 xclk |= EM28XX_XCLK_AUDIO_UNMUTE;
 455
 456         ret = em28xx_write_reg(dev, EM28XX_R0F_XCLK, xclk);
 457         if (ret < 0)
 458                 return ret;
 459         msleep(10);
 460
 461         /* Selects the proper audio input */
 462         ret = em28xx_set_audio_source(dev);
 463
 464         /* Sets volume */
 465         if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
 466                 int vol;
 467
 468                 em28xx_write_ac97(dev, AC97_POWERDOWN, 0x4200);
 469                 em28xx_write_ac97(dev, AC97_EXTENDED_STATUS, 0x0031);
 470                 em28xx_write_ac97(dev, AC97_PCM_LR_ADC_RATE, 0xbb80);
 471
 472                 /* LSB: left channel - both channels with the same level */
 473                 vol = (0x1f - dev->volume) | ((0x1f - dev->volume) << 8);
 474
 475                 /* Mute device, if needed */
 476                 if (dev->mute)
 477                         vol |= 0x8000;
 478
 479                 /* Sets volume */
 480                 for (i = 0; i < ARRAY_SIZE(outputs); i++) {
 481                         if (dev->ctl_aoutput & outputs[i].mux)
 482                                 ret = em28xx_write_ac97(dev, outputs[i].reg,
 483                                                         vol);
 484                         if (ret < 0)
 485                                 em28xx_warn("couldn't setup AC97 register %d\n",
 486                                             outputs[i].reg);
 487                 }
 488
 489                 if (dev->ctl_aoutput & EM28XX_AOUT_PCM_IN) {
 490                         int sel = ac97_return_record_select(dev->ctl_aoutput);
 491
 492                         /* Use the same input for both left and right
 493                            channels */
 494                         sel |= (sel << 8);
 495
 496                         em28xx_write_ac97(dev, AC97_REC_SEL, sel);
 497                 }
 498         }
 499
 500         return ret;
 501 }
 502 EXPORT_SYMBOL_GPL(em28xx_audio_analog_set);
 503
 504 int em28xx_audio_setup(struct em28xx *dev)
 505 {
 506         int vid1, vid2, feat, cfg;
 507         u32 vid = 0;
 508         u8 i2s_samplerates;
 509
 510         if (dev->chip_id == CHIP_ID_EM2870 ||
 511             dev->chip_id == CHIP_ID_EM2874 ||
 512             dev->chip_id == CHIP_ID_EM28174 ||
 513             dev->chip_id == CHIP_ID_EM28178) {
 514                 /* Digital only device - don't load any alsa module */
 515                 dev->int_audio_type = EM28XX_INT_AUDIO_NONE;
 516                 dev->usb_audio_type = EM28XX_USB_AUDIO_NONE;
 517                 return 0;
 518         }
 519
 520         /* See how this device is configured */
 521         cfg = em28xx_read_reg(dev, EM28XX_R00_CHIPCFG);
 522         em28xx_info("Config register raw data: 0x%02x\n", cfg);
 523         if (cfg < 0) { /* Register read error */
 524                 /* Be conservative */
 525                 dev->int_audio_type = EM28XX_INT_AUDIO_AC97;
 526         } else if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) == 0x00) {
 527                 /* The device doesn't have vendor audio at all */
 528                 dev->int_audio_type = EM28XX_INT_AUDIO_NONE;
 529                 dev->usb_audio_type = EM28XX_USB_AUDIO_NONE;
 530                 return 0;
 531         } else if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) != EM28XX_CHIPCFG_AC97) {
 532                 dev->int_audio_type = EM28XX_INT_AUDIO_I2S;
 533                 if (dev->chip_id < CHIP_ID_EM2860 &&
 534                     (cfg & EM28XX_CHIPCFG_AUDIOMASK) ==
 535                     EM2820_CHIPCFG_I2S_1_SAMPRATE)
 536                         i2s_samplerates = 1;
 537                 else if (dev->chip_id >= CHIP_ID_EM2860 &&
 538                          (cfg & EM28XX_CHIPCFG_AUDIOMASK) ==
 539                          EM2860_CHIPCFG_I2S_5_SAMPRATES)
 540                         i2s_samplerates = 5;
 541                 else
 542                         i2s_samplerates = 3;
 543                 em28xx_info("I2S Audio (%d sample rate(s))\n",
 544                             i2s_samplerates);
 545                 /* Skip the code that does AC97 vendor detection */
 546                 dev->audio_mode.ac97 = EM28XX_NO_AC97;
 547                 goto init_audio;
 548         } else {
 549                 dev->int_audio_type = EM28XX_INT_AUDIO_AC97;
 550         }
 551
 552         dev->audio_mode.ac97 = EM28XX_AC97_OTHER;
 553
 554         vid1 = em28xx_read_ac97(dev, AC97_VENDOR_ID1);
 555         if (vid1 < 0) {
 556                 /*
 557                  * Device likely doesn't support AC97
 558                  * Note: (some) em2800 devices without eeprom reports 0x91 on
 559                  *       CHIPCFG register, even not having an AC97 chip
 560                  */
 561                 em28xx_warn("AC97 chip type couldn't be determined\n");
 562                 dev->audio_mode.ac97 = EM28XX_NO_AC97;
 563                 if (dev->usb_audio_type == EM28XX_USB_AUDIO_VENDOR)
 564                         dev->usb_audio_type = EM28XX_USB_AUDIO_NONE;
 565                 dev->int_audio_type = EM28XX_INT_AUDIO_NONE;
 566                 goto init_audio;
 567         }
 568
 569         vid2 = em28xx_read_ac97(dev, AC97_VENDOR_ID2);
 570         if (vid2 < 0)
 571                 goto init_audio;
 572
 573         vid = vid1 << 16 | vid2;
 574         em28xx_warn("AC97 vendor ID = 0x%08x\n", vid);
 575
 576         feat = em28xx_read_ac97(dev, AC97_RESET);
 577         if (feat < 0)
 578                 goto init_audio;
 579
 580         em28xx_warn("AC97 features = 0x%04x\n", feat);
 581
 582         /* Try to identify what audio processor we have */
 583         if (((vid == 0xffffffff) || (vid == 0x83847650)) && (feat == 0x6a90))
 584                 dev->audio_mode.ac97 = EM28XX_AC97_EM202;
 585         else if ((vid >> 8) == 0x838476)
 586                 dev->audio_mode.ac97 = EM28XX_AC97_SIGMATEL;
 587
 588 init_audio:
 589         /* Reports detected AC97 processor */
 590         switch (dev->audio_mode.ac97) {
 591         case EM28XX_NO_AC97:
 592                 em28xx_info("No AC97 audio processor\n");
 593                 break;
 594         case EM28XX_AC97_EM202:
 595                 em28xx_info("Empia 202 AC97 audio processor detected\n");
 596                 break;
 597         case EM28XX_AC97_SIGMATEL:
 598                 em28xx_info("Sigmatel audio processor detected (stac 97%02x)\n",
 599                             vid & 0xff);
 600                 break;
 601         case EM28XX_AC97_OTHER:
 602                 em28xx_warn("Unknown AC97 audio processor detected!\n");
 603                 break;
 604         default:
 605                 break;
 606         }
 607
 608         return em28xx_audio_analog_set(dev);
 609 }
 610 EXPORT_SYMBOL_GPL(em28xx_audio_setup);
 611
 612 const struct em28xx_led *em28xx_find_led(struct em28xx *dev,
 613                                          enum em28xx_led_role role)
 614 {
 615         if (dev->board.leds) {
 616                 u8 k = 0;
 617
 618                 while (dev->board.leds[k].role >= 0 &&
 619                        dev->board.leds[k].role < EM28XX_NUM_LED_ROLES) {
 620                         if (dev->board.leds[k].role == role)
 621                                 return &dev->board.leds[k];
 622                         k++;
 623                 }
 624         }
 625         return NULL;
 626 }
 627 EXPORT_SYMBOL_GPL(em28xx_find_led);
 628
 629 int em28xx_capture_start(struct em28xx *dev, int start)
 630 {
 631         int rc;
 632         const struct em28xx_led *led = NULL;
 633
 634         if (dev->chip_id == CHIP_ID_EM2874 ||
 635             dev->chip_id == CHIP_ID_EM2884 ||
 636             dev->chip_id == CHIP_ID_EM28174 ||
 637             dev->chip_id == CHIP_ID_EM28178) {
 638                 /* The Transport Stream Enable Register moved in em2874 */
 639                 rc = em28xx_write_reg_bits(dev, EM2874_R5F_TS_ENABLE,
 640                                            start ?
 641                                                EM2874_TS1_CAPTURE_ENABLE : 0x00,
 642                                            EM2874_TS1_CAPTURE_ENABLE);
 643         } else {
 644                 /* FIXME: which is the best order? */
 645                 /* video registers are sampled by VREF */
 646                 rc = em28xx_write_reg_bits(dev, EM28XX_R0C_USBSUSP,
 647                                            start ? 0x10 : 0x00, 0x10);
 648                 if (rc < 0)
 649                         return rc;
 650
 651                 if (start) {
 652                         if (dev->board.is_webcam)
 653                                 rc = em28xx_write_reg(dev, 0x13, 0x0c);
 654
 655                         /* Enable video capture */
 656                         rc = em28xx_write_reg(dev, 0x48, 0x00);
 657                         if (rc < 0)
 658                                 return rc;
 659
 660                         if (dev->mode == EM28XX_ANALOG_MODE)
 661                                 rc = em28xx_write_reg(dev,
 662                                                       EM28XX_R12_VINENABLE,
 663                                                       0x67);
 664                         else
 665                                 rc = em28xx_write_reg(dev,
 666                                                       EM28XX_R12_VINENABLE,
 667                                                       0x37);
 668                         if (rc < 0)
 669                                 return rc;
 670
 671                         msleep(6);
 672                 } else {
 673                         /* disable video capture */
 674                         rc = em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x27);
 675                 }
 676         }
 677
 678         if (dev->mode == EM28XX_ANALOG_MODE)
 679                 led = em28xx_find_led(dev, EM28XX_LED_ANALOG_CAPTURING);
 680         else
 681                 led = em28xx_find_led(dev, EM28XX_LED_DIGITAL_CAPTURING);
 682
 683         if (led)
 684                 em28xx_write_reg_bits(dev, led->gpio_reg,
 685                                       (!start ^ led->inverted) ?
 686                                       ~led->gpio_mask : led->gpio_mask,
 687                                       led->gpio_mask);
 688
 689         return rc;
 690 }
 691
 692 int em28xx_gpio_set(struct em28xx *dev, struct em28xx_reg_seq *gpio)
 693 {
 694         int rc = 0;
 695
 696         if (!gpio)
 697                 return rc;
 698
 699         if (dev->mode != EM28XX_SUSPEND) {
 700                 em28xx_write_reg(dev, 0x48, 0x00);
 701                 if (dev->mode == EM28XX_ANALOG_MODE)
 702                         em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x67);
 703                 else
 704                         em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x37);
 705                 msleep(6);
 706         }
 707
 708         /* Send GPIO reset sequences specified at board entry */
 709         while (gpio->sleep >= 0) {
 710                 if (gpio->reg >= 0) {
 711                         rc = em28xx_write_reg_bits(dev,
 712                                                    gpio->reg,
 713                                                    gpio->val,
 714                                                    gpio->mask);
 715                         if (rc < 0)
 716                                 return rc;
 717                 }
 718                 if (gpio->sleep > 0)
 719                         msleep(gpio->sleep);
 720
 721                 gpio++;
 722         }
 723         return rc;
 724 }
 725 EXPORT_SYMBOL_GPL(em28xx_gpio_set);
 726
 727 int em28xx_set_mode(struct em28xx *dev, enum em28xx_mode set_mode)
 728 {
 729         if (dev->mode == set_mode)
 730                 return 0;
 731
 732         if (set_mode == EM28XX_SUSPEND) {
 733                 dev->mode = set_mode;
 734
 735                 /* FIXME: add suspend support for ac97 */
 736
 737                 return em28xx_gpio_set(dev, dev->board.suspend_gpio);
 738         }
 739
 740         dev->mode = set_mode;
 741
 742         if (dev->mode == EM28XX_DIGITAL_MODE)
 743                 return em28xx_gpio_set(dev, dev->board.dvb_gpio);
 744         else
 745                 return em28xx_gpio_set(dev, INPUT(dev->ctl_input)->gpio);
 746 }
 747 EXPORT_SYMBOL_GPL(em28xx_set_mode);
 748
 749 /* ------------------------------------------------------------------
 750         URB control
 751    ------------------------------------------------------------------*/
 752
 753 /*
 754  * URB completion handler for isoc/bulk transfers
 755  */
 756 static void em28xx_irq_callback(struct urb *urb)
 757 {
 758         struct em28xx *dev = urb->context;
 759         int i;
 760
 761         switch (urb->status) {
 762         case 0:             /* success */
 763         case -ETIMEDOUT:    /* NAK */
 764                 break;
 765         case -ECONNRESET:   /* kill */
 766         case -ENOENT:
 767         case -ESHUTDOWN:
 768                 return;
 769         default:            /* error */
 770                 em28xx_isocdbg("urb completition error %d.\n", urb->status);
 771                 break;
 772         }
 773
 774         /* Copy data from URB */
 775         spin_lock(&dev->slock);
 776         dev->usb_ctl.urb_data_copy(dev, urb);
 777         spin_unlock(&dev->slock);
 778
 779         /* Reset urb buffers */
 780         for (i = 0; i < urb->number_of_packets; i++) {
 781                 /* isoc only (bulk: number_of_packets = 0) */
 782                 urb->iso_frame_desc[i].status = 0;
 783                 urb->iso_frame_desc[i].actual_length = 0;
 784         }
 785         urb->status = 0;
 786
 787         urb->status = usb_submit_urb(urb, GFP_ATOMIC);
 788         if (urb->status) {
 789                 em28xx_isocdbg("urb resubmit failed (error=%i)\n",
 790                                urb->status);
 791         }
 792 }
 793
 794 /*
 795  * Stop and Deallocate URBs
 796  */
 797 void em28xx_uninit_usb_xfer(struct em28xx *dev, enum em28xx_mode mode)
 798 {
 799         struct urb *urb;
 800         struct em28xx_usb_bufs *usb_bufs;
 801         int i;
 802
 803         em28xx_isocdbg("em28xx: called em28xx_uninit_usb_xfer in mode %d\n",
 804                        mode);
 805
 806         if (mode == EM28XX_DIGITAL_MODE)
 807                 usb_bufs = &dev->usb_ctl.digital_bufs;
 808         else
 809                 usb_bufs = &dev->usb_ctl.analog_bufs;
 810
 811         for (i = 0; i < usb_bufs->num_bufs; i++) {
 812                 urb = usb_bufs->urb[i];
 813                 if (urb) {
 814                         if (!irqs_disabled())
 815                                 usb_kill_urb(urb);
 816                         else
 817                                 usb_unlink_urb(urb);
 818
 819                         if (usb_bufs->transfer_buffer[i]) {
 820                                 usb_free_coherent(dev->udev,
 821                                                   urb->transfer_buffer_length,
 822                                                   usb_bufs->transfer_buffer[i],
 823                                                   urb->transfer_dma);
 824                         }
 825                         usb_free_urb(urb);
 826                         usb_bufs->urb[i] = NULL;
 827                 }
 828                 usb_bufs->transfer_buffer[i] = NULL;
 829         }
 830
 831         kfree(usb_bufs->urb);
 832         kfree(usb_bufs->transfer_buffer);
 833
 834         usb_bufs->urb = NULL;
 835         usb_bufs->transfer_buffer = NULL;
 836         usb_bufs->num_bufs = 0;
 837
 838         em28xx_capture_start(dev, 0);
 839 }
 840 EXPORT_SYMBOL_GPL(em28xx_uninit_usb_xfer);
 841
 842 /*
 843  * Stop URBs
 844  */
 845 void em28xx_stop_urbs(struct em28xx *dev)
 846 {
 847         int i;
 848         struct urb *urb;
 849         struct em28xx_usb_bufs *isoc_bufs = &dev->usb_ctl.digital_bufs;
 850
 851         em28xx_isocdbg("em28xx: called em28xx_stop_urbs\n");
 852
 853         for (i = 0; i < isoc_bufs->num_bufs; i++) {
 854                 urb = isoc_bufs->urb[i];
 855                 if (urb) {
 856                         if (!irqs_disabled())
 857                                 usb_kill_urb(urb);
 858                         else
 859                                 usb_unlink_urb(urb);
 860                 }
 861         }
 862
 863         em28xx_capture_start(dev, 0);
 864 }
 865 EXPORT_SYMBOL_GPL(em28xx_stop_urbs);
 866
 867 /*
 868  * Allocate URBs
 869  */
 870 int em28xx_alloc_urbs(struct em28xx *dev, enum em28xx_mode mode, int xfer_bulk,
 871                       int num_bufs, int max_pkt_size, int packet_multiplier)
 872 {
 873         struct em28xx_usb_bufs *usb_bufs;
 874         int i;
 875         int sb_size, pipe;
 876         struct urb *urb;
 877         int j, k;
 878
 879         em28xx_isocdbg("em28xx: called em28xx_alloc_isoc in mode %d\n", mode);
 880
 881         /* Check mode and if we have an endpoint for the selected
 882            transfer type, select buffer                          */
 883         if (mode == EM28XX_DIGITAL_MODE) {
 884                 if ((xfer_bulk && !dev->dvb_ep_bulk) ||
 885                     (!xfer_bulk && !dev->dvb_ep_isoc)) {
 886                         em28xx_errdev("no endpoint for DVB mode and transfer type %d\n",
 887                                       xfer_bulk > 0);
 888                         return -EINVAL;
 889                 }
 890                 usb_bufs = &dev->usb_ctl.digital_bufs;
 891         } else if (mode == EM28XX_ANALOG_MODE) {
 892                 if ((xfer_bulk && !dev->analog_ep_bulk) ||
 893                     (!xfer_bulk && !dev->analog_ep_isoc)) {
 894                         em28xx_errdev("no endpoint for analog mode and transfer type %d\n",
 895                                       xfer_bulk > 0);
 896                         return -EINVAL;
 897                 }
 898                 usb_bufs = &dev->usb_ctl.analog_bufs;
 899         } else {
 900                 em28xx_errdev("invalid mode selected\n");
 901                 return -EINVAL;
 902         }
 903
 904         /* De-allocates all pending stuff */
 905         em28xx_uninit_usb_xfer(dev, mode);
 906
 907         usb_bufs->num_bufs = num_bufs;
 908
 909         usb_bufs->urb = kzalloc(sizeof(void *)*num_bufs,  GFP_KERNEL);
 910         if (!usb_bufs->urb) {
 911                 em28xx_errdev("cannot alloc memory for usb buffers\n");
 912                 return -ENOMEM;
 913         }
 914
 915         usb_bufs->transfer_buffer = kzalloc(sizeof(void *)*num_bufs,
 916                                              GFP_KERNEL);
 917         if (!usb_bufs->transfer_buffer) {
 918                 em28xx_errdev("cannot allocate memory for usb transfer\n");
 919                 kfree(usb_bufs->urb);
 920                 return -ENOMEM;
 921         }
 922
 923         usb_bufs->max_pkt_size = max_pkt_size;
 924         if (xfer_bulk)
 925                 usb_bufs->num_packets = 0;
 926         else
 927                 usb_bufs->num_packets = packet_multiplier;
 928         dev->usb_ctl.vid_buf = NULL;
 929         dev->usb_ctl.vbi_buf = NULL;
 930
 931         sb_size = packet_multiplier * usb_bufs->max_pkt_size;
 932
 933         /* allocate urbs and transfer buffers */
 934         for (i = 0; i < usb_bufs->num_bufs; i++) {
 935                 urb = usb_alloc_urb(usb_bufs->num_packets, GFP_KERNEL);
 936                 if (!urb) {
 937                         em28xx_err("cannot alloc usb_ctl.urb %i\n", i);
 938                         em28xx_uninit_usb_xfer(dev, mode);
 939                         return -ENOMEM;
 940                 }
 941                 usb_bufs->urb[i] = urb;
 942
 943                 usb_bufs->transfer_buffer[i] = usb_alloc_coherent(dev->udev,
 944                         sb_size, GFP_KERNEL, &urb->transfer_dma);
 945                 if (!usb_bufs->transfer_buffer[i]) {
 946                         em28xx_err("unable to allocate %i bytes for transfer"
 947                                         " buffer %i%s\n",
 948                                         sb_size, i,
 949                                         in_interrupt() ? " while in int" : "");
 950                         em28xx_uninit_usb_xfer(dev, mode);
 951                         return -ENOMEM;
 952                 }
 953                 memset(usb_bufs->transfer_buffer[i], 0, sb_size);
 954
 955                 if (xfer_bulk) { /* bulk */
 956                         pipe = usb_rcvbulkpipe(dev->udev,
 957                                                mode == EM28XX_ANALOG_MODE ?
 958                                                dev->analog_ep_bulk :
 959                                                dev->dvb_ep_bulk);
 960                         usb_fill_bulk_urb(urb, dev->udev, pipe,
 961                                           usb_bufs->transfer_buffer[i], sb_size,
 962                                           em28xx_irq_callback, dev);
 963                         urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 964                 } else { /* isoc */
 965                         pipe = usb_rcvisocpipe(dev->udev,
 966                                                mode == EM28XX_ANALOG_MODE ?
 967                                                dev->analog_ep_isoc :
 968                                                dev->dvb_ep_isoc);
 969                         usb_fill_int_urb(urb, dev->udev, pipe,
 970                                          usb_bufs->transfer_buffer[i], sb_size,
 971                                          em28xx_irq_callback, dev, 1);
 972                         urb->transfer_flags = URB_ISO_ASAP |
 973                                               URB_NO_TRANSFER_DMA_MAP;
 974                         k = 0;
 975                         for (j = 0; j < usb_bufs->num_packets; j++) {
 976                                 urb->iso_frame_desc[j].offset = k;
 977                                 urb->iso_frame_desc[j].length =
 978                                                         usb_bufs->max_pkt_size;
 979                                 k += usb_bufs->max_pkt_size;
 980                         }
 981                 }
 982
 983                 urb->number_of_packets = usb_bufs->num_packets;
 984         }
 985
 986         return 0;
 987 }
 988 EXPORT_SYMBOL_GPL(em28xx_alloc_urbs);
 989
 990 /*
 991  * Allocate URBs and start IRQ
 992  */
 993 int em28xx_init_usb_xfer(struct em28xx *dev, enum em28xx_mode mode,
 994                          int xfer_bulk, int num_bufs, int max_pkt_size,
 995                     int packet_multiplier,
 996                     int (*urb_data_copy)(struct em28xx *dev, struct urb *urb))
 997 {
 998         struct em28xx_dmaqueue *dma_q = &dev->vidq;
 999         struct em28xx_dmaqueue *vbi_dma_q = &dev->vbiq;
1000         struct em28xx_usb_bufs *usb_bufs;
1001         int i;
1002         int rc;
1003         int alloc;
1004
1005         em28xx_isocdbg("em28xx: called em28xx_init_usb_xfer in mode %d\n",
1006                        mode);
1007
1008         dev->usb_ctl.urb_data_copy = urb_data_copy;
1009
1010         if (mode == EM28XX_DIGITAL_MODE) {
1011                 usb_bufs = &dev->usb_ctl.digital_bufs;
1012                 /* no need to free/alloc usb buffers in digital mode */
1013                 alloc = 0;
1014         } else {
1015                 usb_bufs = &dev->usb_ctl.analog_bufs;
1016                 alloc = 1;
1017         }
1018
1019         if (alloc) {
1020                 rc = em28xx_alloc_urbs(dev, mode, xfer_bulk, num_bufs,
1021                                        max_pkt_size, packet_multiplier);
1022                 if (rc)
1023                         return rc;
1024         }
1025
1026         if (xfer_bulk) {
1027                 rc = usb_clear_halt(dev->udev, usb_bufs->urb[0]->pipe);
1028                 if (rc < 0) {
1029                         em28xx_err("failed to clear USB bulk endpoint stall/halt condition (error=%i)\n",
1030                                    rc);
1031                         em28xx_uninit_usb_xfer(dev, mode);
1032                         return rc;
1033                 }
1034         }
1035
1036         init_waitqueue_head(&dma_q->wq);
1037         init_waitqueue_head(&vbi_dma_q->wq);
1038
1039         em28xx_capture_start(dev, 1);
1040
1041         /* submit urbs and enables IRQ */
1042         for (i = 0; i < usb_bufs->num_bufs; i++) {
1043                 rc = usb_submit_urb(usb_bufs->urb[i], GFP_ATOMIC);
1044                 if (rc) {
1045                         em28xx_err("submit of urb %i failed (error=%i)\n", i,
1046                                    rc);
1047                         em28xx_uninit_usb_xfer(dev, mode);
1048                         return rc;
1049                 }
1050         }
1051
1052         return 0;
1053 }
1054 EXPORT_SYMBOL_GPL(em28xx_init_usb_xfer);
1055
1056 /*
1057  * Device control list
1058  */
1059
1060 static LIST_HEAD(em28xx_devlist);
1061 static DEFINE_MUTEX(em28xx_devlist_mutex);
1062
1063 /*
1064  * Extension interface
1065  */
1066
1067 static LIST_HEAD(em28xx_extension_devlist);
1068
1069 int em28xx_register_extension(struct em28xx_ops *ops)
1070 {
1071         struct em28xx *dev = NULL;
1072
1073         mutex_lock(&em28xx_devlist_mutex);
1074         list_add_tail(&ops->next, &em28xx_extension_devlist);
1075         list_for_each_entry(dev, &em28xx_devlist, devlist) {
1076                 ops->init(dev);
1077         }
1078         mutex_unlock(&em28xx_devlist_mutex);
1079         printk(KERN_INFO "em28xx: Registered (%s) extension\n", ops->name);
1080         return 0;
1081 }
1082 EXPORT_SYMBOL(em28xx_register_extension);
1083
1084 void em28xx_unregister_extension(struct em28xx_ops *ops)
1085 {
1086         struct em28xx *dev = NULL;
1087
1088         mutex_lock(&em28xx_devlist_mutex);
1089         list_for_each_entry(dev, &em28xx_devlist, devlist) {
1090                 ops->fini(dev);
1091         }
1092         list_del(&ops->next);
1093         mutex_unlock(&em28xx_devlist_mutex);
1094         printk(KERN_INFO "Em28xx: Removed (%s) extension\n", ops->name);
1095 }
1096 EXPORT_SYMBOL(em28xx_unregister_extension);
1097
1098 void em28xx_init_extension(struct em28xx *dev)
1099 {
1100         const struct em28xx_ops *ops = NULL;
1101
1102         mutex_lock(&em28xx_devlist_mutex);
1103         list_add_tail(&dev->devlist, &em28xx_devlist);
1104         list_for_each_entry(ops, &em28xx_extension_devlist, next) {
1105                 if (ops->init)
1106                         ops->init(dev);
1107         }
1108         mutex_unlock(&em28xx_devlist_mutex);
1109 }
1110
1111 void em28xx_close_extension(struct em28xx *dev)
1112 {
1113         const struct em28xx_ops *ops = NULL;
1114
1115         mutex_lock(&em28xx_devlist_mutex);
1116         list_for_each_entry(ops, &em28xx_extension_devlist, next) {
1117                 if (ops->fini)
1118                         ops->fini(dev);
1119         }
1120         list_del(&dev->devlist);
1121         mutex_unlock(&em28xx_devlist_mutex);
1122 }
1123
1124 int em28xx_suspend_extension(struct em28xx *dev)
1125 {
1126         const struct em28xx_ops *ops = NULL;
1127
1128         em28xx_info("Suspending extensions\n");
1129         mutex_lock(&em28xx_devlist_mutex);
1130         list_for_each_entry(ops, &em28xx_extension_devlist, next) {
1131                 if (ops->suspend)
1132                         ops->suspend(dev);
1133         }
1134         mutex_unlock(&em28xx_devlist_mutex);
1135         return 0;
1136 }
1137
1138 int em28xx_resume_extension(struct em28xx *dev)
1139 {
1140         const struct em28xx_ops *ops = NULL;
1141
1142         em28xx_info("Resuming extensions\n");
1143         mutex_lock(&em28xx_devlist_mutex);
1144         list_for_each_entry(ops, &em28xx_extension_devlist, next) {
1145                 if (ops->resume)
1146                         ops->resume(dev);
1147         }
1148         mutex_unlock(&em28xx_devlist_mutex);
1149         return 0;
1150 }