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         u16 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->audio_mode.has_audio)
 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;
 508
 509         if (!dev->audio_mode.has_audio)
 510                 return 0;
 511
 512         /* See how this device is configured */
 513         cfg = em28xx_read_reg(dev, EM28XX_R00_CHIPCFG);
 514         em28xx_info("Config register raw data: 0x%02x\n", cfg);
 515         if (cfg < 0) {
 516                 /* Register read error?  */
 517                 cfg = EM28XX_CHIPCFG_AC97; /* Be conservative */
 518         } else if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) == 0x00) {
 519                 /* The device doesn't have vendor audio at all */
 520                 dev->has_alsa_audio = false;
 521                 dev->audio_mode.has_audio = false;
 522                 return 0;
 523         } else if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) != EM28XX_CHIPCFG_AC97) {
 524                 if (dev->chip_id < CHIP_ID_EM2860 &&
 525                     (cfg & EM28XX_CHIPCFG_AUDIOMASK) ==
 526                     EM2820_CHIPCFG_I2S_1_SAMPRATE)
 527                         dev->audio_mode.i2s_samplerates = 1;
 528                 else if (dev->chip_id >= CHIP_ID_EM2860 &&
 529                          (cfg & EM28XX_CHIPCFG_AUDIOMASK) ==
 530                          EM2860_CHIPCFG_I2S_5_SAMPRATES)
 531                         dev->audio_mode.i2s_samplerates = 5;
 532                 else
 533                         dev->audio_mode.i2s_samplerates = 3;
 534                 em28xx_info("I2S Audio (%d sample rate(s))\n",
 535                                                dev->audio_mode.i2s_samplerates);
 536                 /* Skip the code that does AC97 vendor detection */
 537                 dev->audio_mode.ac97 = EM28XX_NO_AC97;
 538                 goto init_audio;
 539         }
 540
 541         dev->audio_mode.ac97 = EM28XX_AC97_OTHER;
 542
 543         vid1 = em28xx_read_ac97(dev, AC97_VENDOR_ID1);
 544         if (vid1 < 0) {
 545                 /*
 546                  * Device likely doesn't support AC97
 547                  * Note: (some) em2800 devices without eeprom reports 0x91 on
 548                  *       CHIPCFG register, even not having an AC97 chip
 549                  */
 550                 em28xx_warn("AC97 chip type couldn't be determined\n");
 551                 dev->audio_mode.ac97 = EM28XX_NO_AC97;
 552                 dev->has_alsa_audio = false;
 553                 dev->audio_mode.has_audio = false;
 554                 goto init_audio;
 555         }
 556
 557         vid2 = em28xx_read_ac97(dev, AC97_VENDOR_ID2);
 558         if (vid2 < 0)
 559                 goto init_audio;
 560
 561         vid = vid1 << 16 | vid2;
 562
 563         dev->audio_mode.ac97_vendor_id = vid;
 564         em28xx_warn("AC97 vendor ID = 0x%08x\n", vid);
 565
 566         feat = em28xx_read_ac97(dev, AC97_RESET);
 567         if (feat < 0)
 568                 goto init_audio;
 569
 570         dev->audio_mode.ac97_feat = feat;
 571         em28xx_warn("AC97 features = 0x%04x\n", feat);
 572
 573         /* Try to identify what audio processor we have */
 574         if (((vid == 0xffffffff) || (vid == 0x83847650)) && (feat == 0x6a90))
 575                 dev->audio_mode.ac97 = EM28XX_AC97_EM202;
 576         else if ((vid >> 8) == 0x838476)
 577                 dev->audio_mode.ac97 = EM28XX_AC97_SIGMATEL;
 578
 579 init_audio:
 580         /* Reports detected AC97 processor */
 581         switch (dev->audio_mode.ac97) {
 582         case EM28XX_NO_AC97:
 583                 em28xx_info("No AC97 audio processor\n");
 584                 break;
 585         case EM28XX_AC97_EM202:
 586                 em28xx_info("Empia 202 AC97 audio processor detected\n");
 587                 break;
 588         case EM28XX_AC97_SIGMATEL:
 589                 em28xx_info("Sigmatel audio processor detected(stac 97%02x)\n",
 590                             dev->audio_mode.ac97_vendor_id & 0xff);
 591                 break;
 592         case EM28XX_AC97_OTHER:
 593                 em28xx_warn("Unknown AC97 audio processor detected!\n");
 594                 break;
 595         default:
 596                 break;
 597         }
 598
 599         return em28xx_audio_analog_set(dev);
 600 }
 601 EXPORT_SYMBOL_GPL(em28xx_audio_setup);
 602
 603 const struct em28xx_led *em28xx_find_led(struct em28xx *dev,
 604                                          enum em28xx_led_role role)
 605 {
 606         if (dev->board.leds) {
 607                 u8 k = 0;
 608                 while (dev->board.leds[k].role >= 0 &&
 609                                dev->board.leds[k].role < EM28XX_NUM_LED_ROLES) {
 610                         if (dev->board.leds[k].role == role)
 611                                 return &dev->board.leds[k];
 612                         k++;
 613                 }
 614         }
 615         return NULL;
 616 }
 617 EXPORT_SYMBOL_GPL(em28xx_find_led);
 618
 619 int em28xx_capture_start(struct em28xx *dev, int start)
 620 {
 621         int rc;
 622
 623         if (dev->chip_id == CHIP_ID_EM2874 ||
 624             dev->chip_id == CHIP_ID_EM2884 ||
 625             dev->chip_id == CHIP_ID_EM28174 ||
 626             dev->chip_id == CHIP_ID_EM28178) {
 627                 /* The Transport Stream Enable Register moved in em2874 */
 628                 rc = em28xx_write_reg_bits(dev, EM2874_R5F_TS_ENABLE,
 629                                            start ?
 630                                                EM2874_TS1_CAPTURE_ENABLE : 0x00,
 631                                            EM2874_TS1_CAPTURE_ENABLE);
 632         } else {
 633                 /* FIXME: which is the best order? */
 634                 /* video registers are sampled by VREF */
 635                 rc = em28xx_write_reg_bits(dev, EM28XX_R0C_USBSUSP,
 636                                            start ? 0x10 : 0x00, 0x10);
 637                 if (rc < 0)
 638                         return rc;
 639
 640                 if (start) {
 641                         if (dev->board.is_webcam)
 642                                 rc = em28xx_write_reg(dev, 0x13, 0x0c);
 643
 644                         /* Enable video capture */
 645                         rc = em28xx_write_reg(dev, 0x48, 0x00);
 646
 647                         if (dev->mode == EM28XX_ANALOG_MODE)
 648                                 rc = em28xx_write_reg(dev,
 649                                                     EM28XX_R12_VINENABLE, 0x67);
 650                         else
 651                                 rc = em28xx_write_reg(dev,
 652                                                     EM28XX_R12_VINENABLE, 0x37);
 653
 654                         msleep(6);
 655                 } else {
 656                         /* disable video capture */
 657                         rc = em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x27);
 658                 }
 659         }
 660
 661         if (rc < 0)
 662                 return rc;
 663
 664         /* Switch (explicitly controlled) analog capturing LED on/off */
 665         if (dev->mode == EM28XX_ANALOG_MODE) {
 666                 const struct em28xx_led *led;
 667                 led = em28xx_find_led(dev, EM28XX_LED_ANALOG_CAPTURING);
 668                 if (led)
 669                         em28xx_write_reg_bits(dev, led->gpio_reg,
 670                                               (!start ^ led->inverted) ?
 671                                               ~led->gpio_mask : led->gpio_mask,
 672                                               led->gpio_mask);
 673         }
 674
 675         return rc;
 676 }
 677
 678 int em28xx_gpio_set(struct em28xx *dev, struct em28xx_reg_seq *gpio)
 679 {
 680         int rc = 0;
 681
 682         if (!gpio)
 683                 return rc;
 684
 685         if (dev->mode != EM28XX_SUSPEND) {
 686                 em28xx_write_reg(dev, 0x48, 0x00);
 687                 if (dev->mode == EM28XX_ANALOG_MODE)
 688                         em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x67);
 689                 else
 690                         em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x37);
 691                 msleep(6);
 692         }
 693
 694         /* Send GPIO reset sequences specified at board entry */
 695         while (gpio->sleep >= 0) {
 696                 if (gpio->reg >= 0) {
 697                         rc = em28xx_write_reg_bits(dev,
 698                                                    gpio->reg,
 699                                                    gpio->val,
 700                                                    gpio->mask);
 701                         if (rc < 0)
 702                                 return rc;
 703                 }
 704                 if (gpio->sleep > 0)
 705                         msleep(gpio->sleep);
 706
 707                 gpio++;
 708         }
 709         return rc;
 710 }
 711 EXPORT_SYMBOL_GPL(em28xx_gpio_set);
 712
 713 int em28xx_set_mode(struct em28xx *dev, enum em28xx_mode set_mode)
 714 {
 715         if (dev->mode == set_mode)
 716                 return 0;
 717
 718         if (set_mode == EM28XX_SUSPEND) {
 719                 dev->mode = set_mode;
 720
 721                 /* FIXME: add suspend support for ac97 */
 722
 723                 return em28xx_gpio_set(dev, dev->board.suspend_gpio);
 724         }
 725
 726         dev->mode = set_mode;
 727
 728         if (dev->mode == EM28XX_DIGITAL_MODE)
 729                 return em28xx_gpio_set(dev, dev->board.dvb_gpio);
 730         else
 731                 return em28xx_gpio_set(dev, INPUT(dev->ctl_input)->gpio);
 732 }
 733 EXPORT_SYMBOL_GPL(em28xx_set_mode);
 734
 735 /* ------------------------------------------------------------------
 736         URB control
 737    ------------------------------------------------------------------*/
 738
 739 /*
 740  * URB completion handler for isoc/bulk transfers
 741  */
 742 static void em28xx_irq_callback(struct urb *urb)
 743 {
 744         struct em28xx *dev = urb->context;
 745         int i;
 746
 747         switch (urb->status) {
 748         case 0:             /* success */
 749         case -ETIMEDOUT:    /* NAK */
 750                 break;
 751         case -ECONNRESET:   /* kill */
 752         case -ENOENT:
 753         case -ESHUTDOWN:
 754                 return;
 755         default:            /* error */
 756                 em28xx_isocdbg("urb completition error %d.\n", urb->status);
 757                 break;
 758         }
 759
 760         /* Copy data from URB */
 761         spin_lock(&dev->slock);
 762         dev->usb_ctl.urb_data_copy(dev, urb);
 763         spin_unlock(&dev->slock);
 764
 765         /* Reset urb buffers */
 766         for (i = 0; i < urb->number_of_packets; i++) {
 767                 /* isoc only (bulk: number_of_packets = 0) */
 768                 urb->iso_frame_desc[i].status = 0;
 769                 urb->iso_frame_desc[i].actual_length = 0;
 770         }
 771         urb->status = 0;
 772
 773         urb->status = usb_submit_urb(urb, GFP_ATOMIC);
 774         if (urb->status) {
 775                 em28xx_isocdbg("urb resubmit failed (error=%i)\n",
 776                                urb->status);
 777         }
 778 }
 779
 780 /*
 781  * Stop and Deallocate URBs
 782  */
 783 void em28xx_uninit_usb_xfer(struct em28xx *dev, enum em28xx_mode mode)
 784 {
 785         struct urb *urb;
 786         struct em28xx_usb_bufs *usb_bufs;
 787         int i;
 788
 789         em28xx_isocdbg("em28xx: called em28xx_uninit_usb_xfer in mode %d\n",
 790                        mode);
 791
 792         if (mode == EM28XX_DIGITAL_MODE)
 793                 usb_bufs = &dev->usb_ctl.digital_bufs;
 794         else
 795                 usb_bufs = &dev->usb_ctl.analog_bufs;
 796
 797         for (i = 0; i < usb_bufs->num_bufs; i++) {
 798                 urb = usb_bufs->urb[i];
 799                 if (urb) {
 800                         if (!irqs_disabled())
 801                                 usb_kill_urb(urb);
 802                         else
 803                                 usb_unlink_urb(urb);
 804
 805                         if (usb_bufs->transfer_buffer[i]) {
 806                                 usb_free_coherent(dev->udev,
 807                                         urb->transfer_buffer_length,
 808                                         usb_bufs->transfer_buffer[i],
 809                                         urb->transfer_dma);
 810                         }
 811                         usb_free_urb(urb);
 812                         usb_bufs->urb[i] = NULL;
 813                 }
 814                 usb_bufs->transfer_buffer[i] = NULL;
 815         }
 816
 817         kfree(usb_bufs->urb);
 818         kfree(usb_bufs->transfer_buffer);
 819
 820         usb_bufs->urb = NULL;
 821         usb_bufs->transfer_buffer = NULL;
 822         usb_bufs->num_bufs = 0;
 823
 824         em28xx_capture_start(dev, 0);
 825 }
 826 EXPORT_SYMBOL_GPL(em28xx_uninit_usb_xfer);
 827
 828 /*
 829  * Stop URBs
 830  */
 831 void em28xx_stop_urbs(struct em28xx *dev)
 832 {
 833         int i;
 834         struct urb *urb;
 835         struct em28xx_usb_bufs *isoc_bufs = &dev->usb_ctl.digital_bufs;
 836
 837         em28xx_isocdbg("em28xx: called em28xx_stop_urbs\n");
 838
 839         for (i = 0; i < isoc_bufs->num_bufs; i++) {
 840                 urb = isoc_bufs->urb[i];
 841                 if (urb) {
 842                         if (!irqs_disabled())
 843                                 usb_kill_urb(urb);
 844                         else
 845                                 usb_unlink_urb(urb);
 846                 }
 847         }
 848
 849         em28xx_capture_start(dev, 0);
 850 }
 851 EXPORT_SYMBOL_GPL(em28xx_stop_urbs);
 852
 853 /*
 854  * Allocate URBs
 855  */
 856 int em28xx_alloc_urbs(struct em28xx *dev, enum em28xx_mode mode, int xfer_bulk,
 857                       int num_bufs, int max_pkt_size, int packet_multiplier)
 858 {
 859         struct em28xx_usb_bufs *usb_bufs;
 860         int i;
 861         int sb_size, pipe;
 862         struct urb *urb;
 863         int j, k;
 864
 865         em28xx_isocdbg("em28xx: called em28xx_alloc_isoc in mode %d\n", mode);
 866
 867         /* Check mode and if we have an endpoint for the selected
 868            transfer type, select buffer                          */
 869         if (mode == EM28XX_DIGITAL_MODE) {
 870                 if ((xfer_bulk && !dev->dvb_ep_bulk) ||
 871                     (!xfer_bulk && !dev->dvb_ep_isoc)) {
 872                         em28xx_errdev("no endpoint for DVB mode and transfer type %d\n",
 873                                       xfer_bulk > 0);
 874                         return -EINVAL;
 875                 }
 876                 usb_bufs = &dev->usb_ctl.digital_bufs;
 877         } else if (mode == EM28XX_ANALOG_MODE) {
 878                 if ((xfer_bulk && !dev->analog_ep_bulk) ||
 879                     (!xfer_bulk && !dev->analog_ep_isoc)) {
 880                         em28xx_errdev("no endpoint for analog mode and transfer type %d\n",
 881                                        xfer_bulk > 0);
 882                         return -EINVAL;
 883                 }
 884                 usb_bufs = &dev->usb_ctl.analog_bufs;
 885         } else {
 886                 em28xx_errdev("invalid mode selected\n");
 887                 return -EINVAL;
 888         }
 889
 890         /* De-allocates all pending stuff */
 891         em28xx_uninit_usb_xfer(dev, mode);
 892
 893         usb_bufs->num_bufs = num_bufs;
 894
 895         usb_bufs->urb = kzalloc(sizeof(void *)*num_bufs,  GFP_KERNEL);
 896         if (!usb_bufs->urb) {
 897                 em28xx_errdev("cannot alloc memory for usb buffers\n");
 898                 return -ENOMEM;
 899         }
 900
 901         usb_bufs->transfer_buffer = kzalloc(sizeof(void *)*num_bufs,
 902                                              GFP_KERNEL);
 903         if (!usb_bufs->transfer_buffer) {
 904                 em28xx_errdev("cannot allocate memory for usb transfer\n");
 905                 kfree(usb_bufs->urb);
 906                 return -ENOMEM;
 907         }
 908
 909         usb_bufs->max_pkt_size = max_pkt_size;
 910         if (xfer_bulk)
 911                 usb_bufs->num_packets = 0;
 912         else
 913                 usb_bufs->num_packets = packet_multiplier;
 914         dev->usb_ctl.vid_buf = NULL;
 915         dev->usb_ctl.vbi_buf = NULL;
 916
 917         sb_size = packet_multiplier * usb_bufs->max_pkt_size;
 918
 919         /* allocate urbs and transfer buffers */
 920         for (i = 0; i < usb_bufs->num_bufs; i++) {
 921                 urb = usb_alloc_urb(usb_bufs->num_packets, GFP_KERNEL);
 922                 if (!urb) {
 923                         em28xx_err("cannot alloc usb_ctl.urb %i\n", i);
 924                         em28xx_uninit_usb_xfer(dev, mode);
 925                         return -ENOMEM;
 926                 }
 927                 usb_bufs->urb[i] = urb;
 928
 929                 usb_bufs->transfer_buffer[i] = usb_alloc_coherent(dev->udev,
 930                         sb_size, GFP_KERNEL, &urb->transfer_dma);
 931                 if (!usb_bufs->transfer_buffer[i]) {
 932                         em28xx_err("unable to allocate %i bytes for transfer"
 933                                         " buffer %i%s\n",
 934                                         sb_size, i,
 935                                         in_interrupt() ? " while in int" : "");
 936                         em28xx_uninit_usb_xfer(dev, mode);
 937                         return -ENOMEM;
 938                 }
 939                 memset(usb_bufs->transfer_buffer[i], 0, sb_size);
 940
 941                 if (xfer_bulk) { /* bulk */
 942                         pipe = usb_rcvbulkpipe(dev->udev,
 943                                                mode == EM28XX_ANALOG_MODE ?
 944                                                dev->analog_ep_bulk :
 945                                                dev->dvb_ep_bulk);
 946                         usb_fill_bulk_urb(urb, dev->udev, pipe,
 947                                           usb_bufs->transfer_buffer[i], sb_size,
 948                                           em28xx_irq_callback, dev);
 949                         urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 950                 } else { /* isoc */
 951                         pipe = usb_rcvisocpipe(dev->udev,
 952                                                mode == EM28XX_ANALOG_MODE ?
 953                                                dev->analog_ep_isoc :
 954                                                dev->dvb_ep_isoc);
 955                         usb_fill_int_urb(urb, dev->udev, pipe,
 956                                          usb_bufs->transfer_buffer[i], sb_size,
 957                                          em28xx_irq_callback, dev, 1);
 958                         urb->transfer_flags = URB_ISO_ASAP |
 959                                               URB_NO_TRANSFER_DMA_MAP;
 960                         k = 0;
 961                         for (j = 0; j < usb_bufs->num_packets; j++) {
 962                                 urb->iso_frame_desc[j].offset = k;
 963                                 urb->iso_frame_desc[j].length =
 964                                                         usb_bufs->max_pkt_size;
 965                                 k += usb_bufs->max_pkt_size;
 966                         }
 967                 }
 968
 969                 urb->number_of_packets = usb_bufs->num_packets;
 970         }
 971
 972         return 0;
 973 }
 974 EXPORT_SYMBOL_GPL(em28xx_alloc_urbs);
 975
 976 /*
 977  * Allocate URBs and start IRQ
 978  */
 979 int em28xx_init_usb_xfer(struct em28xx *dev, enum em28xx_mode mode,
 980                     int xfer_bulk, int num_bufs, int max_pkt_size,
 981                     int packet_multiplier,
 982                     int (*urb_data_copy) (struct em28xx *dev, struct urb *urb))
 983 {
 984         struct em28xx_dmaqueue *dma_q = &dev->vidq;
 985         struct em28xx_dmaqueue *vbi_dma_q = &dev->vbiq;
 986         struct em28xx_usb_bufs *usb_bufs;
 987         int i;
 988         int rc;
 989         int alloc;
 990
 991         em28xx_isocdbg("em28xx: called em28xx_init_usb_xfer in mode %d\n",
 992                        mode);
 993
 994         dev->usb_ctl.urb_data_copy = urb_data_copy;
 995
 996         if (mode == EM28XX_DIGITAL_MODE) {
 997                 usb_bufs = &dev->usb_ctl.digital_bufs;
 998                 /* no need to free/alloc usb buffers in digital mode */
 999                 alloc = 0;
1000         } else {
1001                 usb_bufs = &dev->usb_ctl.analog_bufs;
1002                 alloc = 1;
1003         }
1004
1005         if (alloc) {
1006                 rc = em28xx_alloc_urbs(dev, mode, xfer_bulk, num_bufs,
1007                                        max_pkt_size, packet_multiplier);
1008                 if (rc)
1009                         return rc;
1010         }
1011
1012         if (xfer_bulk) {
1013                 rc = usb_clear_halt(dev->udev, usb_bufs->urb[0]->pipe);
1014                 if (rc < 0) {
1015                         em28xx_err("failed to clear USB bulk endpoint stall/halt condition (error=%i)\n",
1016                                    rc);
1017                         em28xx_uninit_usb_xfer(dev, mode);
1018                         return rc;
1019                 }
1020         }
1021
1022         init_waitqueue_head(&dma_q->wq);
1023         init_waitqueue_head(&vbi_dma_q->wq);
1024
1025         em28xx_capture_start(dev, 1);
1026
1027         /* submit urbs and enables IRQ */
1028         for (i = 0; i < usb_bufs->num_bufs; i++) {
1029                 rc = usb_submit_urb(usb_bufs->urb[i], GFP_ATOMIC);
1030                 if (rc) {
1031                         em28xx_err("submit of urb %i failed (error=%i)\n", i,
1032                                    rc);
1033                         em28xx_uninit_usb_xfer(dev, mode);
1034                         return rc;
1035                 }
1036         }
1037
1038         return 0;
1039 }
1040 EXPORT_SYMBOL_GPL(em28xx_init_usb_xfer);
1041
1042 /*
1043  * Device control list
1044  */
1045
1046 static LIST_HEAD(em28xx_devlist);
1047 static DEFINE_MUTEX(em28xx_devlist_mutex);
1048
1049 /*
1050  * Extension interface
1051  */
1052
1053 static LIST_HEAD(em28xx_extension_devlist);
1054
1055 int em28xx_register_extension(struct em28xx_ops *ops)
1056 {
1057         struct em28xx *dev = NULL;
1058
1059         mutex_lock(&em28xx_devlist_mutex);
1060         list_add_tail(&ops->next, &em28xx_extension_devlist);
1061         list_for_each_entry(dev, &em28xx_devlist, devlist) {
1062                 ops->init(dev);
1063         }
1064         mutex_unlock(&em28xx_devlist_mutex);
1065         printk(KERN_INFO "em28xx: Registered (%s) extension\n", ops->name);
1066         return 0;
1067 }
1068 EXPORT_SYMBOL(em28xx_register_extension);
1069
1070 void em28xx_unregister_extension(struct em28xx_ops *ops)
1071 {
1072         struct em28xx *dev = NULL;
1073
1074         mutex_lock(&em28xx_devlist_mutex);
1075         list_for_each_entry(dev, &em28xx_devlist, devlist) {
1076                 ops->fini(dev);
1077         }
1078         list_del(&ops->next);
1079         mutex_unlock(&em28xx_devlist_mutex);
1080         printk(KERN_INFO "Em28xx: Removed (%s) extension\n", ops->name);
1081 }
1082 EXPORT_SYMBOL(em28xx_unregister_extension);
1083
1084 void em28xx_init_extension(struct em28xx *dev)
1085 {
1086         const struct em28xx_ops *ops = NULL;
1087
1088         mutex_lock(&em28xx_devlist_mutex);
1089         list_add_tail(&dev->devlist, &em28xx_devlist);
1090         list_for_each_entry(ops, &em28xx_extension_devlist, next) {
1091                 if (ops->init)
1092                         ops->init(dev);
1093         }
1094         mutex_unlock(&em28xx_devlist_mutex);
1095 }
1096
1097 void em28xx_close_extension(struct em28xx *dev)
1098 {
1099         const struct em28xx_ops *ops = NULL;
1100
1101         mutex_lock(&em28xx_devlist_mutex);
1102         list_for_each_entry(ops, &em28xx_extension_devlist, next) {
1103                 if (ops->fini)
1104                         ops->fini(dev);
1105         }
1106         list_del(&dev->devlist);
1107         mutex_unlock(&em28xx_devlist_mutex);
1108 }