drivers/media/video/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
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  */
  23
  24 #include <linux/init.h>
  25 #include <linux/list.h>
  26 #include <linux/module.h>
  27 #include <linux/usb.h>
  28 #include <linux/vmalloc.h>
  29 #include <media/v4l2-common.h>
  30
  31 #include "em28xx.h"
  32
  33 /* #define ENABLE_DEBUG_ISOC_FRAMES */
  34
  35 static unsigned int core_debug;
  36 module_param(core_debug, int, 0644);
  37 MODULE_PARM_DESC(core_debug, "enable debug messages [core]");
  38
  39 #define em28xx_coredbg(fmt, arg...) do {\
  40         if (core_debug) \
  41                 printk(KERN_INFO "%s %s :"fmt, \
  42                          dev->name, __func__ , ##arg); } while (0)
  43
  44 static unsigned int reg_debug;
  45 module_param(reg_debug, int, 0644);
  46 MODULE_PARM_DESC(reg_debug, "enable debug messages [URB reg]");
  47
  48 #define em28xx_regdbg(fmt, arg...) do {\
  49         if (reg_debug) \
  50                 printk(KERN_INFO "%s %s :"fmt, \
  51                          dev->name, __func__ , ##arg); } while (0)
  52
  53 static int alt = EM28XX_PINOUT;
  54 module_param(alt, int, 0644);
  55 MODULE_PARM_DESC(alt, "alternate setting to use for video endpoint");
  56
  57 /* FIXME */
  58 #define em28xx_isocdbg(fmt, arg...) do {\
  59         if (core_debug) \
  60                 printk(KERN_INFO "%s %s :"fmt, \
  61                          dev->name, __func__ , ##arg); } while (0)
  62
  63 /*
  64  * em28xx_read_reg_req()
  65  * reads data from the usb device specifying bRequest
  66  */
  67 int em28xx_read_reg_req_len(struct em28xx *dev, u8 req, u16 reg,
  68                                    char *buf, int len)
  69 {
  70         int ret;
  71         int pipe = usb_rcvctrlpipe(dev->udev, 0);
  72
  73         if (dev->state & DEV_DISCONNECTED)
  74                 return -ENODEV;
  75
  76         if (len > URB_MAX_CTRL_SIZE)
  77                 return -EINVAL;
  78
  79         if (reg_debug) {
  80                 printk(KERN_DEBUG "(pipe 0x%08x): "
  81                         "IN:  %02x %02x %02x %02x %02x %02x %02x %02x ",
  82                         pipe,
  83                         USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  84                         req, 0, 0,
  85                         reg & 0xff, reg >> 8,
  86                         len & 0xff, len >> 8);
  87         }
  88
  89         mutex_lock(&dev->ctrl_urb_lock);
  90         ret = usb_control_msg(dev->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                 if (reg_debug)
  95                         printk(" failed!\n");
  96                 mutex_unlock(&dev->ctrl_urb_lock);
  97                 return ret;
  98         }
  99
 100         if (len)
 101                 memcpy(buf, dev->urb_buf, len);
 102
 103         mutex_unlock(&dev->ctrl_urb_lock);
 104
 105         if (reg_debug) {
 106                 int byte;
 107
 108                 printk("<<<");
 109                 for (byte = 0; byte < len; byte++)
 110                         printk(" %02x", (unsigned char)buf[byte]);
 111                 printk("\n");
 112         }
 113
 114         return ret;
 115 }
 116
 117 /*
 118  * em28xx_read_reg_req()
 119  * reads data from the usb device specifying bRequest
 120  */
 121 int em28xx_read_reg_req(struct em28xx *dev, u8 req, u16 reg)
 122 {
 123         int ret;
 124         u8 val;
 125
 126         ret = em28xx_read_reg_req_len(dev, req, reg, &val, 1);
 127         if (ret < 0)
 128                 return ret;
 129
 130         return val;
 131 }
 132
 133 int em28xx_read_reg(struct em28xx *dev, u16 reg)
 134 {
 135         return em28xx_read_reg_req(dev, USB_REQ_GET_STATUS, reg);
 136 }
 137
 138 /*
 139  * em28xx_write_regs_req()
 140  * sends data to the usb device, specifying bRequest
 141  */
 142 int em28xx_write_regs_req(struct em28xx *dev, u8 req, u16 reg, char *buf,
 143                                  int len)
 144 {
 145         int ret;
 146         int pipe = usb_sndctrlpipe(dev->udev, 0);
 147
 148         if (dev->state & DEV_DISCONNECTED)
 149                 return -ENODEV;
 150
 151         if ((len < 1) || (len > URB_MAX_CTRL_SIZE))
 152                 return -EINVAL;
 153
 154         if (reg_debug) {
 155                 int byte;
 156
 157                 printk(KERN_DEBUG "(pipe 0x%08x): "
 158                         "OUT: %02x %02x %02x %02x %02x %02x %02x %02x >>>",
 159                         pipe,
 160                         USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 161                         req, 0, 0,
 162                         reg & 0xff, reg >> 8,
 163                         len & 0xff, len >> 8);
 164
 165                 for (byte = 0; byte < len; byte++)
 166                         printk(" %02x", (unsigned char)buf[byte]);
 167                 printk("\n");
 168         }
 169
 170         mutex_lock(&dev->ctrl_urb_lock);
 171         memcpy(dev->urb_buf, buf, len);
 172         ret = usb_control_msg(dev->udev, pipe, req,
 173                               USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 174                               0x0000, reg, dev->urb_buf, len, HZ);
 175         mutex_unlock(&dev->ctrl_urb_lock);
 176
 177         if (dev->wait_after_write)
 178                 msleep(dev->wait_after_write);
 179
 180         return ret;
 181 }
 182
 183 int em28xx_write_regs(struct em28xx *dev, u16 reg, char *buf, int len)
 184 {
 185         int rc;
 186
 187         rc = em28xx_write_regs_req(dev, USB_REQ_GET_STATUS, reg, buf, len);
 188
 189         /* Stores GPO/GPIO values at the cache, if changed
 190            Only write values should be stored, since input on a GPIO
 191            register will return the input bits.
 192            Not sure what happens on reading GPO register.
 193          */
 194         if (rc >= 0) {
 195                 if (reg == dev->reg_gpo_num)
 196                         dev->reg_gpo = buf[0];
 197                 else if (reg == dev->reg_gpio_num)
 198                         dev->reg_gpio = buf[0];
 199         }
 200
 201         return rc;
 202 }
 203
 204 /* Write a single register */
 205 int em28xx_write_reg(struct em28xx *dev, u16 reg, u8 val)
 206 {
 207         return em28xx_write_regs(dev, reg, &val, 1);
 208 }
 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 static int em28xx_write_reg_bits(struct em28xx *dev, u16 reg, u8 val,
 216                                  u8 bitmask)
 217 {
 218         int oldval;
 219         u8 newval;
 220
 221         /* Uses cache for gpo/gpio registers */
 222         if (reg == dev->reg_gpo_num)
 223                 oldval = dev->reg_gpo;
 224         else if (reg == dev->reg_gpio_num)
 225                 oldval = dev->reg_gpio;
 226         else
 227                 oldval = em28xx_read_reg(dev, reg);
 228
 229         if (oldval < 0)
 230                 return oldval;
 231
 232         newval = (((u8) oldval) & ~bitmask) | (val & bitmask);
 233
 234         return em28xx_write_regs(dev, reg, &newval, 1);
 235 }
 236
 237 /*
 238  * em28xx_is_ac97_ready()
 239  * Checks if ac97 is ready
 240  */
 241 static int em28xx_is_ac97_ready(struct em28xx *dev)
 242 {
 243         int ret, i;
 244
 245         /* Wait up to 50 ms for AC97 command to complete */
 246         for (i = 0; i < 10; i++, msleep(5)) {
 247                 ret = em28xx_read_reg(dev, EM28XX_R43_AC97BUSY);
 248                 if (ret < 0)
 249                         return ret;
 250
 251                 if (!(ret & 0x01))
 252                         return 0;
 253         }
 254
 255         em28xx_warn("AC97 command still being executed: not handled properly!\n");
 256         return -EBUSY;
 257 }
 258
 259 /*
 260  * em28xx_read_ac97()
 261  * write a 16 bit value to the specified AC97 address (LSB first!)
 262  */
 263 int em28xx_read_ac97(struct em28xx *dev, u8 reg)
 264 {
 265         int ret;
 266         u8 addr = (reg & 0x7f) | 0x80;
 267         u16 val;
 268
 269         ret = em28xx_is_ac97_ready(dev);
 270         if (ret < 0)
 271                 return ret;
 272
 273         ret = em28xx_write_regs(dev, EM28XX_R42_AC97ADDR, &addr, 1);
 274         if (ret < 0)
 275                 return ret;
 276
 277         ret = dev->em28xx_read_reg_req_len(dev, 0, EM28XX_R40_AC97LSB,
 278                                            (u8 *)&val, sizeof(val));
 279
 280         if (ret < 0)
 281                 return ret;
 282         return le16_to_cpu(val);
 283 }
 284
 285 /*
 286  * em28xx_write_ac97()
 287  * write a 16 bit value to the specified AC97 address (LSB first!)
 288  */
 289 int em28xx_write_ac97(struct em28xx *dev, u8 reg, u16 val)
 290 {
 291         int ret;
 292         u8 addr = reg & 0x7f;
 293         __le16 value;
 294
 295         value = cpu_to_le16(val);
 296
 297         ret = em28xx_is_ac97_ready(dev);
 298         if (ret < 0)
 299                 return ret;
 300
 301         ret = em28xx_write_regs(dev, EM28XX_R40_AC97LSB, (u8 *) &value, 2);
 302         if (ret < 0)
 303                 return ret;
 304
 305         ret = em28xx_write_regs(dev, EM28XX_R42_AC97ADDR, &addr, 1);
 306         if (ret < 0)
 307                 return ret;
 308
 309         return 0;
 310 }
 311
 312 struct em28xx_vol_table {
 313         enum em28xx_amux mux;
 314         u8               reg;
 315 };
 316
 317 static struct em28xx_vol_table inputs[] = {
 318         { EM28XX_AMUX_VIDEO,    AC97_VIDEO_VOL   },
 319         { EM28XX_AMUX_LINE_IN,  AC97_LINEIN_VOL  },
 320         { EM28XX_AMUX_PHONE,    AC97_PHONE_VOL   },
 321         { EM28XX_AMUX_MIC,      AC97_MIC_VOL     },
 322         { EM28XX_AMUX_CD,       AC97_CD_VOL      },
 323         { EM28XX_AMUX_AUX,      AC97_AUX_VOL     },
 324         { EM28XX_AMUX_PCM_OUT,  AC97_PCM_OUT_VOL },
 325 };
 326
 327 static int set_ac97_input(struct em28xx *dev)
 328 {
 329         int ret, i;
 330         enum em28xx_amux amux = dev->ctl_ainput;
 331
 332         /* EM28XX_AMUX_VIDEO2 is a special case used to indicate that
 333            em28xx should point to LINE IN, while AC97 should use VIDEO
 334          */
 335         if (amux == EM28XX_AMUX_VIDEO2)
 336                 amux = EM28XX_AMUX_VIDEO;
 337
 338         /* Mute all entres but the one that were selected */
 339         for (i = 0; i < ARRAY_SIZE(inputs); i++) {
 340                 if (amux == inputs[i].mux)
 341                         ret = em28xx_write_ac97(dev, inputs[i].reg, 0x0808);
 342                 else
 343                         ret = em28xx_write_ac97(dev, inputs[i].reg, 0x8000);
 344
 345                 if (ret < 0)
 346                         em28xx_warn("couldn't setup AC97 register %d\n",
 347                                      inputs[i].reg);
 348         }
 349         return 0;
 350 }
 351
 352 static int em28xx_set_audio_source(struct em28xx *dev)
 353 {
 354         int ret;
 355         u8 input;
 356
 357         if (dev->board.is_em2800) {
 358                 if (dev->ctl_ainput == EM28XX_AMUX_VIDEO)
 359                         input = EM2800_AUDIO_SRC_TUNER;
 360                 else
 361                         input = EM2800_AUDIO_SRC_LINE;
 362
 363                 ret = em28xx_write_regs(dev, EM2800_R08_AUDIOSRC, &input, 1);
 364                 if (ret < 0)
 365                         return ret;
 366         }
 367
 368         if (dev->board.has_msp34xx)
 369                 input = EM28XX_AUDIO_SRC_TUNER;
 370         else {
 371                 switch (dev->ctl_ainput) {
 372                 case EM28XX_AMUX_VIDEO:
 373                         input = EM28XX_AUDIO_SRC_TUNER;
 374                         break;
 375                 default:
 376                         input = EM28XX_AUDIO_SRC_LINE;
 377                         break;
 378                 }
 379         }
 380
 381         ret = em28xx_write_reg_bits(dev, EM28XX_R0E_AUDIOSRC, input, 0xc0);
 382         if (ret < 0)
 383                 return ret;
 384         msleep(5);
 385
 386         switch (dev->audio_mode.ac97) {
 387         case EM28XX_NO_AC97:
 388                 break;
 389         default:
 390                 ret = set_ac97_input(dev);
 391         }
 392
 393         return ret;
 394 }
 395
 396 static const struct em28xx_vol_table outputs[] = {
 397         { EM28XX_AOUT_MASTER, AC97_MASTER_VOL      },
 398         { EM28XX_AOUT_LINE,   AC97_LINE_LEVEL_VOL  },
 399         { EM28XX_AOUT_MONO,   AC97_MASTER_MONO_VOL },
 400         { EM28XX_AOUT_LFE,    AC97_LFE_MASTER_VOL  },
 401         { EM28XX_AOUT_SURR,   AC97_SURR_MASTER_VOL },
 402 };
 403
 404 int em28xx_audio_analog_set(struct em28xx *dev)
 405 {
 406         int ret, i;
 407         u8 xclk;
 408
 409         if (!dev->audio_mode.has_audio)
 410                 return 0;
 411
 412         /* It is assumed that all devices use master volume for output.
 413            It would be possible to use also line output.
 414          */
 415         if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
 416                 /* Mute all outputs */
 417                 for (i = 0; i < ARRAY_SIZE(outputs); i++) {
 418                         ret = em28xx_write_ac97(dev, outputs[i].reg, 0x8000);
 419                         if (ret < 0)
 420                                 em28xx_warn("couldn't setup AC97 register %d\n",
 421                                      outputs[i].reg);
 422                 }
 423         }
 424
 425         xclk = dev->board.xclk & 0x7f;
 426         if (!dev->mute)
 427                 xclk |= EM28XX_XCLK_AUDIO_UNMUTE;
 428
 429         ret = em28xx_write_reg(dev, EM28XX_R0F_XCLK, xclk);
 430         if (ret < 0)
 431                 return ret;
 432         msleep(10);
 433
 434         /* Selects the proper audio input */
 435         ret = em28xx_set_audio_source(dev);
 436
 437         /* Sets volume */
 438         if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
 439                 int vol;
 440
 441                 em28xx_write_ac97(dev, AC97_POWER_DOWN_CTRL, 0x4200);
 442                 em28xx_write_ac97(dev, AC97_EXT_AUD_CTRL, 0x0031);
 443                 em28xx_write_ac97(dev, AC97_PCM_IN_SRATE, 0xbb80);
 444
 445                 /* LSB: left channel - both channels with the same level */
 446                 vol = (0x1f - dev->volume) | ((0x1f - dev->volume) << 8);
 447
 448                 /* Mute device, if needed */
 449                 if (dev->mute)
 450                         vol |= 0x8000;
 451
 452                 /* Sets volume */
 453                 for (i = 0; i < ARRAY_SIZE(outputs); i++) {
 454                         if (dev->ctl_aoutput & outputs[i].mux)
 455                                 ret = em28xx_write_ac97(dev, outputs[i].reg,
 456                                                         vol);
 457                         if (ret < 0)
 458                                 em28xx_warn("couldn't setup AC97 register %d\n",
 459                                      outputs[i].reg);
 460                 }
 461
 462                 if (dev->ctl_aoutput & EM28XX_AOUT_PCM_IN) {
 463                         int sel = ac97_return_record_select(dev->ctl_aoutput);
 464
 465                         /* Use the same input for both left and right
 466                            channels */
 467                         sel |= (sel << 8);
 468
 469                         em28xx_write_ac97(dev, AC97_RECORD_SELECT, sel);
 470                 }
 471         }
 472
 473         return ret;
 474 }
 475 EXPORT_SYMBOL_GPL(em28xx_audio_analog_set);
 476
 477 int em28xx_audio_setup(struct em28xx *dev)
 478 {
 479         int vid1, vid2, feat, cfg;
 480         u32 vid;
 481
 482         if (dev->chip_id == CHIP_ID_EM2870 || dev->chip_id == CHIP_ID_EM2874) {
 483                 /* Digital only device - don't load any alsa module */
 484                 dev->audio_mode.has_audio = 0;
 485                 dev->has_audio_class = 0;
 486                 dev->has_alsa_audio = 0;
 487                 return 0;
 488         }
 489
 490         /* If device doesn't support Usb Audio Class, use vendor class */
 491         if (!dev->has_audio_class)
 492                 dev->has_alsa_audio = 1;
 493
 494         dev->audio_mode.has_audio = 1;
 495
 496         /* See how this device is configured */
 497         cfg = em28xx_read_reg(dev, EM28XX_R00_CHIPCFG);
 498         if (cfg < 0)
 499                 cfg = EM28XX_CHIPCFG_AC97; /* Be conservative */
 500         else
 501                 em28xx_info("Config register raw data: 0x%02x\n", cfg);
 502
 503         if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) ==
 504                     EM28XX_CHIPCFG_I2S_3_SAMPRATES) {
 505                 em28xx_info("I2S Audio (3 sample rates)\n");
 506                 dev->audio_mode.i2s_3rates = 1;
 507         }
 508         if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) ==
 509                     EM28XX_CHIPCFG_I2S_5_SAMPRATES) {
 510                 em28xx_info("I2S Audio (5 sample rates)\n");
 511                 dev->audio_mode.i2s_5rates = 1;
 512         }
 513
 514         if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) != EM28XX_CHIPCFG_AC97) {
 515                 /* Skip the code that does AC97 vendor detection */
 516                 dev->audio_mode.ac97 = EM28XX_NO_AC97;
 517                 goto init_audio;
 518         }
 519
 520         dev->audio_mode.ac97 = EM28XX_AC97_OTHER;
 521
 522         vid1 = em28xx_read_ac97(dev, AC97_VENDOR_ID1);
 523         if (vid1 < 0) {
 524                 /* Device likely doesn't support AC97 */
 525                 em28xx_warn("AC97 chip type couldn't be determined\n");
 526                 goto init_audio;
 527         }
 528
 529         vid2 = em28xx_read_ac97(dev, AC97_VENDOR_ID2);
 530         if (vid2 < 0)
 531                 goto init_audio;
 532
 533         vid = vid1 << 16 | vid2;
 534
 535         dev->audio_mode.ac97_vendor_id = vid;
 536         em28xx_warn("AC97 vendor ID = 0x%08x\n", vid);
 537
 538         feat = em28xx_read_ac97(dev, AC97_RESET);
 539         if (feat < 0)
 540                 goto init_audio;
 541
 542         dev->audio_mode.ac97_feat = feat;
 543         em28xx_warn("AC97 features = 0x%04x\n", feat);
 544
 545         /* Try to identify what audio processor we have */
 546         if ((vid == 0xffffffff) && (feat == 0x6a90))
 547                 dev->audio_mode.ac97 = EM28XX_AC97_EM202;
 548         else if ((vid >> 8) == 0x838476)
 549                 dev->audio_mode.ac97 = EM28XX_AC97_SIGMATEL;
 550
 551 init_audio:
 552         /* Reports detected AC97 processor */
 553         switch (dev->audio_mode.ac97) {
 554         case EM28XX_NO_AC97:
 555                 em28xx_info("No AC97 audio processor\n");
 556                 break;
 557         case EM28XX_AC97_EM202:
 558                 em28xx_info("Empia 202 AC97 audio processor detected\n");
 559                 break;
 560         case EM28XX_AC97_SIGMATEL:
 561                 em28xx_info("Sigmatel audio processor detected(stac 97%02x)\n",
 562                             dev->audio_mode.ac97_vendor_id & 0xff);
 563                 break;
 564         case EM28XX_AC97_OTHER:
 565                 em28xx_warn("Unknown AC97 audio processor detected!\n");
 566                 break;
 567         default:
 568                 break;
 569         }
 570
 571         return em28xx_audio_analog_set(dev);
 572 }
 573 EXPORT_SYMBOL_GPL(em28xx_audio_setup);
 574
 575 int em28xx_colorlevels_set_default(struct em28xx *dev)
 576 {
 577         em28xx_write_reg(dev, EM28XX_R20_YGAIN, 0x10);  /* contrast */
 578         em28xx_write_reg(dev, EM28XX_R21_YOFFSET, 0x00);        /* brightness */
 579         em28xx_write_reg(dev, EM28XX_R22_UVGAIN, 0x10); /* saturation */
 580         em28xx_write_reg(dev, EM28XX_R23_UOFFSET, 0x00);
 581         em28xx_write_reg(dev, EM28XX_R24_VOFFSET, 0x00);
 582         em28xx_write_reg(dev, EM28XX_R25_SHARPNESS, 0x00);
 583
 584         em28xx_write_reg(dev, EM28XX_R14_GAMMA, 0x20);
 585         em28xx_write_reg(dev, EM28XX_R15_RGAIN, 0x20);
 586         em28xx_write_reg(dev, EM28XX_R16_GGAIN, 0x20);
 587         em28xx_write_reg(dev, EM28XX_R17_BGAIN, 0x20);
 588         em28xx_write_reg(dev, EM28XX_R18_ROFFSET, 0x00);
 589         em28xx_write_reg(dev, EM28XX_R19_GOFFSET, 0x00);
 590         return em28xx_write_reg(dev, EM28XX_R1A_BOFFSET, 0x00);
 591 }
 592
 593 int em28xx_capture_start(struct em28xx *dev, int start)
 594 {
 595         int rc;
 596
 597         if (dev->chip_id == CHIP_ID_EM2874) {
 598                 /* The Transport Stream Enable Register moved in em2874 */
 599                 if (!start) {
 600                         rc = em28xx_write_reg_bits(dev, EM2874_R5F_TS_ENABLE,
 601                                                    0x00,
 602                                                    EM2874_TS1_CAPTURE_ENABLE);
 603                         return rc;
 604                 }
 605
 606                 /* Enable Transport Stream */
 607                 rc = em28xx_write_reg_bits(dev, EM2874_R5F_TS_ENABLE,
 608                                            EM2874_TS1_CAPTURE_ENABLE,
 609                                            EM2874_TS1_CAPTURE_ENABLE);
 610                 return rc;
 611         }
 612
 613
 614         /* FIXME: which is the best order? */
 615         /* video registers are sampled by VREF */
 616         rc = em28xx_write_reg_bits(dev, EM28XX_R0C_USBSUSP,
 617                                    start ? 0x10 : 0x00, 0x10);
 618         if (rc < 0)
 619                 return rc;
 620
 621         if (!start) {
 622                 /* disable video capture */
 623                 rc = em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x27);
 624                 return rc;
 625         }
 626
 627         /* enable video capture */
 628         rc = em28xx_write_reg(dev, 0x48, 0x00);
 629
 630         if (dev->mode == EM28XX_ANALOG_MODE)
 631                 rc = em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x67);
 632         else
 633                 rc = em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x37);
 634
 635         msleep(6);
 636
 637         return rc;
 638 }
 639
 640 int em28xx_set_outfmt(struct em28xx *dev)
 641 {
 642         int ret;
 643
 644         ret = em28xx_write_reg_bits(dev, EM28XX_R27_OUTFMT,
 645                                     dev->format->reg | 0x20, 0x3f);
 646         if (ret < 0)
 647                 return ret;
 648
 649         ret = em28xx_write_reg(dev, EM28XX_R10_VINMODE, 0x10);
 650         if (ret < 0)
 651                 return ret;
 652
 653         return em28xx_write_reg(dev, EM28XX_R11_VINCTRL, 0x11);
 654 }
 655
 656 static int em28xx_accumulator_set(struct em28xx *dev, u8 xmin, u8 xmax,
 657                                   u8 ymin, u8 ymax)
 658 {
 659         em28xx_coredbg("em28xx Scale: (%d,%d)-(%d,%d)\n",
 660                         xmin, ymin, xmax, ymax);
 661
 662         em28xx_write_regs(dev, EM28XX_R28_XMIN, &xmin, 1);
 663         em28xx_write_regs(dev, EM28XX_R29_XMAX, &xmax, 1);
 664         em28xx_write_regs(dev, EM28XX_R2A_YMIN, &ymin, 1);
 665         return em28xx_write_regs(dev, EM28XX_R2B_YMAX, &ymax, 1);
 666 }
 667
 668 static int em28xx_capture_area_set(struct em28xx *dev, u8 hstart, u8 vstart,
 669                                    u16 width, u16 height)
 670 {
 671         u8 cwidth = width;
 672         u8 cheight = height;
 673         u8 overflow = (height >> 7 & 0x02) | (width >> 8 & 0x01);
 674
 675         em28xx_coredbg("em28xx Area Set: (%d,%d)\n",
 676                         (width | (overflow & 2) << 7),
 677                         (height | (overflow & 1) << 8));
 678
 679         em28xx_write_regs(dev, EM28XX_R1C_HSTART, &hstart, 1);
 680         em28xx_write_regs(dev, EM28XX_R1D_VSTART, &vstart, 1);
 681         em28xx_write_regs(dev, EM28XX_R1E_CWIDTH, &cwidth, 1);
 682         em28xx_write_regs(dev, EM28XX_R1F_CHEIGHT, &cheight, 1);
 683         return em28xx_write_regs(dev, EM28XX_R1B_OFLOW, &overflow, 1);
 684 }
 685
 686 static int em28xx_scaler_set(struct em28xx *dev, u16 h, u16 v)
 687 {
 688         u8 mode;
 689         /* the em2800 scaler only supports scaling down to 50% */
 690         if (dev->board.is_em2800)
 691                 mode = (v ? 0x20 : 0x00) | (h ? 0x10 : 0x00);
 692         else {
 693                 u8 buf[2];
 694                 buf[0] = h;
 695                 buf[1] = h >> 8;
 696                 em28xx_write_regs(dev, EM28XX_R30_HSCALELOW, (char *)buf, 2);
 697                 buf[0] = v;
 698                 buf[1] = v >> 8;
 699                 em28xx_write_regs(dev, EM28XX_R32_VSCALELOW, (char *)buf, 2);
 700                 /* it seems that both H and V scalers must be active
 701                    to work correctly */
 702                 mode = (h || v) ? 0x30 : 0x00;
 703         }
 704         return em28xx_write_reg_bits(dev, EM28XX_R26_COMPR, mode, 0x30);
 705 }
 706
 707 /* FIXME: this only function read values from dev */
 708 int em28xx_resolution_set(struct em28xx *dev)
 709 {
 710         int width, height;
 711         width = norm_maxw(dev);
 712         height = norm_maxh(dev) >> 1;
 713
 714         em28xx_set_outfmt(dev);
 715         em28xx_accumulator_set(dev, 1, (width - 4) >> 2, 1, (height - 4) >> 2);
 716         em28xx_capture_area_set(dev, 0, 0, width >> 2, height >> 2);
 717         return em28xx_scaler_set(dev, dev->hscale, dev->vscale);
 718 }
 719
 720 int em28xx_set_alternate(struct em28xx *dev)
 721 {
 722         int errCode, prev_alt = dev->alt;
 723         int i;
 724         unsigned int min_pkt_size = dev->width * 2 + 4;
 725
 726         /* When image size is bigger than a certain value,
 727            the frame size should be increased, otherwise, only
 728            green screen will be received.
 729          */
 730         if (dev->width * 2 * dev->height > 720 * 240 * 2)
 731                 min_pkt_size *= 2;
 732
 733         for (i = 0; i < dev->num_alt; i++) {
 734                 /* stop when the selected alt setting offers enough bandwidth */
 735                 if (dev->alt_max_pkt_size[i] >= min_pkt_size) {
 736                         dev->alt = i;
 737                         break;
 738                 /* otherwise make sure that we end up with the maximum bandwidth
 739                    because the min_pkt_size equation might be wrong...
 740                 */
 741                 } else if (dev->alt_max_pkt_size[i] >
 742                            dev->alt_max_pkt_size[dev->alt])
 743                         dev->alt = i;
 744         }
 745
 746         if (dev->alt != prev_alt) {
 747                 em28xx_coredbg("minimum isoc packet size: %u (alt=%d)\n",
 748                                 min_pkt_size, dev->alt);
 749                 dev->max_pkt_size = dev->alt_max_pkt_size[dev->alt];
 750                 em28xx_coredbg("setting alternate %d with wMaxPacketSize=%u\n",
 751                                dev->alt, dev->max_pkt_size);
 752                 errCode = usb_set_interface(dev->udev, 0, dev->alt);
 753                 if (errCode < 0) {
 754                         em28xx_errdev("cannot change alternate number to %d (error=%i)\n",
 755                                         dev->alt, errCode);
 756                         return errCode;
 757                 }
 758         }
 759         return 0;
 760 }
 761
 762 int em28xx_gpio_set(struct em28xx *dev, struct em28xx_reg_seq *gpio)
 763 {
 764         int rc = 0;
 765
 766         if (!gpio)
 767                 return rc;
 768
 769         if (dev->mode != EM28XX_SUSPEND) {
 770                 em28xx_write_reg(dev, 0x48, 0x00);
 771                 if (dev->mode == EM28XX_ANALOG_MODE)
 772                         em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x67);
 773                 else
 774                         em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x37);
 775                 msleep(6);
 776         }
 777
 778         /* Send GPIO reset sequences specified at board entry */
 779         while (gpio->sleep >= 0) {
 780                 if (gpio->reg >= 0) {
 781                         rc = em28xx_write_reg_bits(dev,
 782                                                    gpio->reg,
 783                                                    gpio->val,
 784                                                    gpio->mask);
 785                         if (rc < 0)
 786                                 return rc;
 787                 }
 788                 if (gpio->sleep > 0)
 789                         msleep(gpio->sleep);
 790
 791                 gpio++;
 792         }
 793         return rc;
 794 }
 795
 796 int em28xx_set_mode(struct em28xx *dev, enum em28xx_mode set_mode)
 797 {
 798         if (dev->mode == set_mode)
 799                 return 0;
 800
 801         if (set_mode == EM28XX_SUSPEND) {
 802                 dev->mode = set_mode;
 803
 804                 /* FIXME: add suspend support for ac97 */
 805
 806                 return em28xx_gpio_set(dev, dev->board.suspend_gpio);
 807         }
 808
 809         dev->mode = set_mode;
 810
 811         if (dev->mode == EM28XX_DIGITAL_MODE)
 812                 return em28xx_gpio_set(dev, dev->board.dvb_gpio);
 813         else
 814                 return em28xx_gpio_set(dev, INPUT(dev->ctl_input)->gpio);
 815 }
 816 EXPORT_SYMBOL_GPL(em28xx_set_mode);
 817
 818 /* ------------------------------------------------------------------
 819         URB control
 820    ------------------------------------------------------------------*/
 821
 822 /*
 823  * IRQ callback, called by URB callback
 824  */
 825 static void em28xx_irq_callback(struct urb *urb)
 826 {
 827         struct em28xx_dmaqueue  *dma_q = urb->context;
 828         struct em28xx *dev = container_of(dma_q, struct em28xx, vidq);
 829         int rc, i;
 830
 831         switch (urb->status) {
 832         case 0:             /* success */
 833         case -ETIMEDOUT:    /* NAK */
 834                 break;
 835         case -ECONNRESET:   /* kill */
 836         case -ENOENT:
 837         case -ESHUTDOWN:
 838                 return;
 839         default:            /* error */
 840                 em28xx_isocdbg("urb completition error %d.\n", urb->status);
 841                 break;
 842         }
 843
 844         /* Copy data from URB */
 845         spin_lock(&dev->slock);
 846         rc = dev->isoc_ctl.isoc_copy(dev, urb);
 847         spin_unlock(&dev->slock);
 848
 849         /* Reset urb buffers */
 850         for (i = 0; i < urb->number_of_packets; i++) {
 851                 urb->iso_frame_desc[i].status = 0;
 852                 urb->iso_frame_desc[i].actual_length = 0;
 853         }
 854         urb->status = 0;
 855
 856         urb->status = usb_submit_urb(urb, GFP_ATOMIC);
 857         if (urb->status) {
 858                 em28xx_isocdbg("urb resubmit failed (error=%i)\n",
 859                                urb->status);
 860         }
 861 }
 862
 863 /*
 864  * Stop and Deallocate URBs
 865  */
 866 void em28xx_uninit_isoc(struct em28xx *dev)
 867 {
 868         struct urb *urb;
 869         int i;
 870
 871         em28xx_isocdbg("em28xx: called em28xx_uninit_isoc\n");
 872
 873         dev->isoc_ctl.nfields = -1;
 874         for (i = 0; i < dev->isoc_ctl.num_bufs; i++) {
 875                 urb = dev->isoc_ctl.urb[i];
 876                 if (urb) {
 877                         if (!irqs_disabled())
 878                                 usb_kill_urb(urb);
 879                         else
 880                                 usb_unlink_urb(urb);
 881
 882                         if (dev->isoc_ctl.transfer_buffer[i]) {
 883                                 usb_buffer_free(dev->udev,
 884                                         urb->transfer_buffer_length,
 885                                         dev->isoc_ctl.transfer_buffer[i],
 886                                         urb->transfer_dma);
 887                         }
 888                         usb_free_urb(urb);
 889                         dev->isoc_ctl.urb[i] = NULL;
 890                 }
 891                 dev->isoc_ctl.transfer_buffer[i] = NULL;
 892         }
 893
 894         kfree(dev->isoc_ctl.urb);
 895         kfree(dev->isoc_ctl.transfer_buffer);
 896
 897         dev->isoc_ctl.urb = NULL;
 898         dev->isoc_ctl.transfer_buffer = NULL;
 899         dev->isoc_ctl.num_bufs = 0;
 900
 901         em28xx_capture_start(dev, 0);
 902 }
 903 EXPORT_SYMBOL_GPL(em28xx_uninit_isoc);
 904
 905 /*
 906  * Allocate URBs and start IRQ
 907  */
 908 int em28xx_init_isoc(struct em28xx *dev, int max_packets,
 909                      int num_bufs, int max_pkt_size,
 910                      int (*isoc_copy) (struct em28xx *dev, struct urb *urb))
 911 {
 912         struct em28xx_dmaqueue *dma_q = &dev->vidq;
 913         int i;
 914         int sb_size, pipe;
 915         struct urb *urb;
 916         int j, k;
 917         int rc;
 918
 919         em28xx_isocdbg("em28xx: called em28xx_prepare_isoc\n");
 920
 921         /* De-allocates all pending stuff */
 922         em28xx_uninit_isoc(dev);
 923
 924         dev->isoc_ctl.isoc_copy = isoc_copy;
 925         dev->isoc_ctl.num_bufs = num_bufs;
 926
 927         dev->isoc_ctl.urb = kzalloc(sizeof(void *)*num_bufs,  GFP_KERNEL);
 928         if (!dev->isoc_ctl.urb) {
 929                 em28xx_errdev("cannot alloc memory for usb buffers\n");
 930                 return -ENOMEM;
 931         }
 932
 933         dev->isoc_ctl.transfer_buffer = kzalloc(sizeof(void *)*num_bufs,
 934                                               GFP_KERNEL);
 935         if (!dev->isoc_ctl.transfer_buffer) {
 936                 em28xx_errdev("cannot allocate memory for usbtransfer\n");
 937                 kfree(dev->isoc_ctl.urb);
 938                 return -ENOMEM;
 939         }
 940
 941         dev->isoc_ctl.max_pkt_size = max_pkt_size;
 942         dev->isoc_ctl.buf = NULL;
 943
 944         sb_size = max_packets * dev->isoc_ctl.max_pkt_size;
 945
 946         /* allocate urbs and transfer buffers */
 947         for (i = 0; i < dev->isoc_ctl.num_bufs; i++) {
 948                 urb = usb_alloc_urb(max_packets, GFP_KERNEL);
 949                 if (!urb) {
 950                         em28xx_err("cannot alloc isoc_ctl.urb %i\n", i);
 951                         em28xx_uninit_isoc(dev);
 952                         return -ENOMEM;
 953                 }
 954                 dev->isoc_ctl.urb[i] = urb;
 955
 956                 dev->isoc_ctl.transfer_buffer[i] = usb_buffer_alloc(dev->udev,
 957                         sb_size, GFP_KERNEL, &urb->transfer_dma);
 958                 if (!dev->isoc_ctl.transfer_buffer[i]) {
 959                         em28xx_err("unable to allocate %i bytes for transfer"
 960                                         " buffer %i%s\n",
 961                                         sb_size, i,
 962                                         in_interrupt() ? " while in int" : "");
 963                         em28xx_uninit_isoc(dev);
 964                         return -ENOMEM;
 965                 }
 966                 memset(dev->isoc_ctl.transfer_buffer[i], 0, sb_size);
 967
 968                 /* FIXME: this is a hack - should be
 969                         'desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK'
 970                         should also be using 'desc.bInterval'
 971                  */
 972                 pipe = usb_rcvisocpipe(dev->udev,
 973                         dev->mode == EM28XX_ANALOG_MODE ? 0x82 : 0x84);
 974
 975                 usb_fill_int_urb(urb, dev->udev, pipe,
 976                                  dev->isoc_ctl.transfer_buffer[i], sb_size,
 977                                  em28xx_irq_callback, dma_q, 1);
 978
 979                 urb->number_of_packets = max_packets;
 980                 urb->transfer_flags = URB_ISO_ASAP;
 981
 982                 k = 0;
 983                 for (j = 0; j < max_packets; j++) {
 984                         urb->iso_frame_desc[j].offset = k;
 985                         urb->iso_frame_desc[j].length =
 986                                                 dev->isoc_ctl.max_pkt_size;
 987                         k += dev->isoc_ctl.max_pkt_size;
 988                 }
 989         }
 990
 991         init_waitqueue_head(&dma_q->wq);
 992
 993         em28xx_capture_start(dev, 1);
 994
 995         /* submit urbs and enables IRQ */
 996         for (i = 0; i < dev->isoc_ctl.num_bufs; i++) {
 997                 rc = usb_submit_urb(dev->isoc_ctl.urb[i], GFP_ATOMIC);
 998                 if (rc) {
 999                         em28xx_err("submit of urb %i failed (error=%i)\n", i,
1000                                    rc);
1001                         em28xx_uninit_isoc(dev);
1002                         return rc;
1003                 }
1004         }
1005
1006         return 0;
1007 }
1008 EXPORT_SYMBOL_GPL(em28xx_init_isoc);
1009
1010 /*
1011  * em28xx_wake_i2c()
1012  * configure i2c attached devices
1013  */
1014 void em28xx_wake_i2c(struct em28xx *dev)
1015 {
1016         struct v4l2_routing route;
1017         int zero = 0;
1018
1019         route.input = INPUT(dev->ctl_input)->vmux;
1020         route.output = 0;
1021         em28xx_i2c_call_clients(dev, VIDIOC_INT_RESET, &zero);
1022         em28xx_i2c_call_clients(dev, VIDIOC_INT_S_VIDEO_ROUTING, &route);
1023         em28xx_i2c_call_clients(dev, VIDIOC_STREAMON, NULL);
1024 }
1025
1026 /*
1027  * Device control list
1028  */
1029
1030 static LIST_HEAD(em28xx_devlist);
1031 static DEFINE_MUTEX(em28xx_devlist_mutex);
1032
1033 struct em28xx *em28xx_get_device(int minor,
1034                                  enum v4l2_buf_type *fh_type,
1035                                  int *has_radio)
1036 {
1037         struct em28xx *h, *dev = NULL;
1038
1039         *fh_type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1040         *has_radio = 0;
1041
1042         mutex_lock(&em28xx_devlist_mutex);
1043         list_for_each_entry(h, &em28xx_devlist, devlist) {
1044                 if (h->vdev->minor == minor)
1045                         dev = h;
1046                 if (h->vbi_dev->minor == minor) {
1047                         dev = h;
1048                         *fh_type = V4L2_BUF_TYPE_VBI_CAPTURE;
1049                 }
1050                 if (h->radio_dev &&
1051                     h->radio_dev->minor == minor) {
1052                         dev = h;
1053                         *has_radio = 1;
1054                 }
1055         }
1056         mutex_unlock(&em28xx_devlist_mutex);
1057
1058         return dev;
1059 }
1060
1061 /*
1062  * em28xx_realease_resources()
1063  * unregisters the v4l2,i2c and usb devices
1064  * called when the device gets disconected or at module unload
1065 */
1066 void em28xx_remove_from_devlist(struct em28xx *dev)
1067 {
1068         mutex_lock(&em28xx_devlist_mutex);
1069         list_del(&dev->devlist);
1070         mutex_unlock(&em28xx_devlist_mutex);
1071 };
1072
1073 void em28xx_add_into_devlist(struct em28xx *dev)
1074 {
1075         mutex_lock(&em28xx_devlist_mutex);
1076         list_add_tail(&dev->devlist, &em28xx_devlist);
1077         mutex_unlock(&em28xx_devlist_mutex);
1078 };
1079
1080 /*
1081  * Extension interface
1082  */
1083
1084 static LIST_HEAD(em28xx_extension_devlist);
1085 static DEFINE_MUTEX(em28xx_extension_devlist_lock);
1086
1087 int em28xx_register_extension(struct em28xx_ops *ops)
1088 {
1089         struct em28xx *dev = NULL;
1090
1091         mutex_lock(&em28xx_devlist_mutex);
1092         mutex_lock(&em28xx_extension_devlist_lock);
1093         list_add_tail(&ops->next, &em28xx_extension_devlist);
1094         list_for_each_entry(dev, &em28xx_devlist, devlist) {
1095                 if (dev)
1096                         ops->init(dev);
1097         }
1098         printk(KERN_INFO "Em28xx: Initialized (%s) extension\n", ops->name);
1099         mutex_unlock(&em28xx_extension_devlist_lock);
1100         mutex_unlock(&em28xx_devlist_mutex);
1101         return 0;
1102 }
1103 EXPORT_SYMBOL(em28xx_register_extension);
1104
1105 void em28xx_unregister_extension(struct em28xx_ops *ops)
1106 {
1107         struct em28xx *dev = NULL;
1108
1109         mutex_lock(&em28xx_devlist_mutex);
1110         list_for_each_entry(dev, &em28xx_devlist, devlist) {
1111                 if (dev)
1112                         ops->fini(dev);
1113         }
1114
1115         mutex_lock(&em28xx_extension_devlist_lock);
1116         printk(KERN_INFO "Em28xx: Removed (%s) extension\n", ops->name);
1117         list_del(&ops->next);
1118         mutex_unlock(&em28xx_extension_devlist_lock);
1119         mutex_unlock(&em28xx_devlist_mutex);
1120 }
1121 EXPORT_SYMBOL(em28xx_unregister_extension);
1122
1123 void em28xx_init_extension(struct em28xx *dev)
1124 {
1125         struct em28xx_ops *ops = NULL;
1126
1127         mutex_lock(&em28xx_extension_devlist_lock);
1128         if (!list_empty(&em28xx_extension_devlist)) {
1129                 list_for_each_entry(ops, &em28xx_extension_devlist, next) {
1130                         if (ops->init)
1131                                 ops->init(dev);
1132                 }
1133         }
1134         mutex_unlock(&em28xx_extension_devlist_lock);
1135 }
1136
1137 void em28xx_close_extension(struct em28xx *dev)
1138 {
1139         struct em28xx_ops *ops = NULL;
1140
1141         mutex_lock(&em28xx_extension_devlist_lock);
1142         if (!list_empty(&em28xx_extension_devlist)) {
1143                 list_for_each_entry(ops, &em28xx_extension_devlist, next) {
1144                         if (ops->fini)
1145                                 ops->fini(dev);
1146                 }
1147         }
1148         mutex_unlock(&em28xx_extension_devlist_lock);
1149 }