Pileus Git - ~andy/linux/blob - drivers/media/video/saa7164/saa7164-cards.c

   1 /*
   2  *  Driver for the NXP SAA7164 PCIe bridge
   3  *
   4  *  Copyright (c) 2009 Steven Toth <stoth@kernellabs.com>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #include <linux/init.h>
  23 #include <linux/module.h>
  24 #include <linux/pci.h>
  25 #include <linux/delay.h>
  26
  27 #include "saa7164.h"
  28
  29 /* The Bridge API needs to understand register widths (in bytes) for the
  30  * attached I2C devices, so we can simplify the virtual i2c mechansms
  31  * and keep the -i2c.c implementation clean.
  32  */
  33 #define REGLEN_8bit     1
  34 #define REGLEN_16bit    2
  35
  36 struct saa7164_board saa7164_boards[] = {
  37         [SAA7164_BOARD_UNKNOWN] = {
  38                 /* Bridge will not load any firmware, without knowing
  39                  * the rev this would be fatal. */
  40                 .name           = "Unknown",
  41         },
  42         [SAA7164_BOARD_UNKNOWN_REV2] = {
  43                 /* Bridge will load the v2 f/w and dump descriptors */
  44                 /* Required during new board bringup */
  45                 .name           = "Generic Rev2",
  46                 .chiprev        = SAA7164_CHIP_REV2,
  47         },
  48         [SAA7164_BOARD_UNKNOWN_REV3] = {
  49                 /* Bridge will load the v2 f/w and dump descriptors */
  50                 /* Required during new board bringup */
  51                 .name           = "Generic Rev3",
  52                 .chiprev        = SAA7164_CHIP_REV3,
  53         },
  54         [SAA7164_BOARD_HAUPPAUGE_HVR2200] = {
  55                 .name           = "Hauppauge WinTV-HVR2200",
  56                 .porta          = SAA7164_MPEG_DVB,
  57                 .portb          = SAA7164_MPEG_DVB,
  58                 .chiprev        = SAA7164_CHIP_REV3,
  59                 .unit           = {{
  60                         .id             = 0x06,
  61                         .type           = SAA7164_UNIT_EEPROM,
  62                         .name           = "4K EEPROM",
  63                         .i2c_bus_nr     = SAA7164_I2C_BUS_0,
  64                         .i2c_bus_addr   = 0xa0 >> 1,
  65                         .i2c_reg_len    = REGLEN_8bit,
  66                 }, {
  67                         .id             = 0x04,
  68                         .type           = SAA7164_UNIT_TUNER,
  69                         .name           = "TDA18271-1",
  70                         .i2c_bus_nr     = SAA7164_I2C_BUS_1,
  71                         .i2c_bus_addr   = 0xc0 >> 1,
  72                         .i2c_reg_len    = REGLEN_8bit,
  73                 }, {
  74                         .id             = 0x1b,
  75                         .type           = SAA7164_UNIT_TUNER,
  76                         .name           = "TDA18271-2",
  77                         .i2c_bus_nr     = SAA7164_I2C_BUS_2,
  78                         .i2c_bus_addr   = 0xc0 >> 1,
  79                         .i2c_reg_len    = REGLEN_8bit,
  80                 }, {
  81                         .id             = 0x1e,
  82                         .type           = SAA7164_UNIT_DIGITAL_DEMODULATOR,
  83                         .name           = "TDA10048-1",
  84                         .i2c_bus_nr     = SAA7164_I2C_BUS_1,
  85                         .i2c_bus_addr   = 0x10 >> 1,
  86                         .i2c_reg_len    = REGLEN_8bit,
  87                 }, {
  88                         .id             = 0x1f,
  89                         .type           = SAA7164_UNIT_DIGITAL_DEMODULATOR,
  90                         .name           = "TDA10048-2",
  91                         .i2c_bus_nr     = SAA7164_I2C_BUS_2,
  92                         .i2c_bus_addr   = 0x12 >> 1,
  93                         .i2c_reg_len    = REGLEN_8bit,
  94                 } },
  95         },
  96         [SAA7164_BOARD_HAUPPAUGE_HVR2200_2] = {
  97                 .name           = "Hauppauge WinTV-HVR2200",
  98                 .porta          = SAA7164_MPEG_DVB,
  99                 .portb          = SAA7164_MPEG_DVB,
 100                 .chiprev        = SAA7164_CHIP_REV2,
 101                 .unit           = {{
 102                         .id             = 0x06,
 103                         .type           = SAA7164_UNIT_EEPROM,
 104                         .name           = "4K EEPROM",
 105                         .i2c_bus_nr     = SAA7164_I2C_BUS_0,
 106                         .i2c_bus_addr   = 0xa0 >> 1,
 107                         .i2c_reg_len    = REGLEN_8bit,
 108                 }, {
 109                         .id             = 0x04,
 110                         .type           = SAA7164_UNIT_TUNER,
 111                         .name           = "TDA18271-1",
 112                         .i2c_bus_nr     = SAA7164_I2C_BUS_1,
 113                         .i2c_bus_addr   = 0xc0 >> 1,
 114                         .i2c_reg_len    = REGLEN_8bit,
 115                 }, {
 116                         .id             = 0x05,
 117                         .type           = SAA7164_UNIT_DIGITAL_DEMODULATOR,
 118                         .name           = "TDA10048-1",
 119                         .i2c_bus_nr     = SAA7164_I2C_BUS_1,
 120                         .i2c_bus_addr   = 0x10 >> 1,
 121                         .i2c_reg_len    = REGLEN_8bit,
 122                 }, {
 123                         .id             = 0x1e,
 124                         .type           = SAA7164_UNIT_TUNER,
 125                         .name           = "TDA18271-2",
 126                         .i2c_bus_nr     = SAA7164_I2C_BUS_2,
 127                         .i2c_bus_addr   = 0xc0 >> 1,
 128                         .i2c_reg_len    = REGLEN_8bit,
 129                 }, {
 130                         .id             = 0x1f,
 131                         .type           = SAA7164_UNIT_DIGITAL_DEMODULATOR,
 132                         .name           = "TDA10048-2",
 133                         .i2c_bus_nr     = SAA7164_I2C_BUS_2,
 134                         .i2c_bus_addr   = 0x12 >> 1,
 135                         .i2c_reg_len    = REGLEN_8bit,
 136                 } },
 137         },
 138         [SAA7164_BOARD_HAUPPAUGE_HVR2200_3] = {
 139                 .name           = "Hauppauge WinTV-HVR2200",
 140                 .porta          = SAA7164_MPEG_DVB,
 141                 .portb          = SAA7164_MPEG_DVB,
 142                 .chiprev        = SAA7164_CHIP_REV2,
 143                 .unit           = {{
 144                         .id             = 0x06,
 145                         .type           = SAA7164_UNIT_EEPROM,
 146                         .name           = "4K EEPROM",
 147                         .i2c_bus_nr     = SAA7164_I2C_BUS_0,
 148                         .i2c_bus_addr   = 0xa0 >> 1,
 149                         .i2c_reg_len    = REGLEN_8bit,
 150                 }, {
 151                         .id             = 0x04,
 152                         .type           = SAA7164_UNIT_TUNER,
 153                         .name           = "TDA18271-1",
 154                         .i2c_bus_nr     = SAA7164_I2C_BUS_1,
 155                         .i2c_bus_addr   = 0xc0 >> 1,
 156                         .i2c_reg_len    = REGLEN_8bit,
 157                 }, {
 158                         .id             = 0x05,
 159                         .type           = SAA7164_UNIT_ANALOG_DEMODULATOR,
 160                         .name           = "TDA8290-1",
 161                         .i2c_bus_nr     = SAA7164_I2C_BUS_1,
 162                         .i2c_bus_addr   = 0x84 >> 1,
 163                         .i2c_reg_len    = REGLEN_8bit,
 164                 }, {
 165                         .id             = 0x1b,
 166                         .type           = SAA7164_UNIT_TUNER,
 167                         .name           = "TDA18271-2",
 168                         .i2c_bus_nr     = SAA7164_I2C_BUS_2,
 169                         .i2c_bus_addr   = 0xc0 >> 1,
 170                         .i2c_reg_len    = REGLEN_8bit,
 171                 }, {
 172                         .id             = 0x1c,
 173                         .type           = SAA7164_UNIT_ANALOG_DEMODULATOR,
 174                         .name           = "TDA8290-2",
 175                         .i2c_bus_nr     = SAA7164_I2C_BUS_2,
 176                         .i2c_bus_addr   = 0x84 >> 1,
 177                         .i2c_reg_len    = REGLEN_8bit,
 178                 }, {
 179                         .id             = 0x1e,
 180                         .type           = SAA7164_UNIT_DIGITAL_DEMODULATOR,
 181                         .name           = "TDA10048-1",
 182                         .i2c_bus_nr     = SAA7164_I2C_BUS_1,
 183                         .i2c_bus_addr   = 0x10 >> 1,
 184                         .i2c_reg_len    = REGLEN_8bit,
 185                 }, {
 186                         .id             = 0x1f,
 187                         .type           = SAA7164_UNIT_DIGITAL_DEMODULATOR,
 188                         .name           = "TDA10048-2",
 189                         .i2c_bus_nr     = SAA7164_I2C_BUS_2,
 190                         .i2c_bus_addr   = 0x12 >> 1,
 191                         .i2c_reg_len    = REGLEN_8bit,
 192                 } },
 193         },
 194         [SAA7164_BOARD_HAUPPAUGE_HVR2250] = {
 195                 .name           = "Hauppauge WinTV-HVR2250",
 196                 .porta          = SAA7164_MPEG_DVB,
 197                 .portb          = SAA7164_MPEG_DVB,
 198                 .chiprev        = SAA7164_CHIP_REV3,
 199                 .unit           = {{
 200                         .id             = 0x22,
 201                         .type           = SAA7164_UNIT_EEPROM,
 202                         .name           = "4K EEPROM",
 203                         .i2c_bus_nr     = SAA7164_I2C_BUS_0,
 204                         .i2c_bus_addr   = 0xa0 >> 1,
 205                         .i2c_reg_len    = REGLEN_8bit,
 206                 }, {
 207                         .id             = 0x04,
 208                         .type           = SAA7164_UNIT_TUNER,
 209                         .name           = "TDA18271-1",
 210                         .i2c_bus_nr     = SAA7164_I2C_BUS_1,
 211                         .i2c_bus_addr   = 0xc0 >> 1,
 212                         .i2c_reg_len    = REGLEN_8bit,
 213                 }, {
 214                         .id             = 0x07,
 215                         .type           = SAA7164_UNIT_DIGITAL_DEMODULATOR,
 216                         .name           = "CX24228/S5H1411-1 (TOP)",
 217                         .i2c_bus_nr     = SAA7164_I2C_BUS_1,
 218                         .i2c_bus_addr   = 0x32 >> 1,
 219                         .i2c_reg_len    = REGLEN_8bit,
 220                 }, {
 221                         .id             = 0x08,
 222                         .type           = SAA7164_UNIT_DIGITAL_DEMODULATOR,
 223                         .name           = "CX24228/S5H1411-1 (QAM)",
 224                         .i2c_bus_nr     = SAA7164_I2C_BUS_1,
 225                         .i2c_bus_addr   = 0x34 >> 1,
 226                         .i2c_reg_len    = REGLEN_8bit,
 227                 }, {
 228                         .id             = 0x1e,
 229                         .type           = SAA7164_UNIT_TUNER,
 230                         .name           = "TDA18271-2",
 231                         .i2c_bus_nr     = SAA7164_I2C_BUS_2,
 232                         .i2c_bus_addr   = 0xc0 >> 1,
 233                         .i2c_reg_len    = REGLEN_8bit,
 234                 }, {
 235                         .id             = 0x20,
 236                         .type           = SAA7164_UNIT_DIGITAL_DEMODULATOR,
 237                         .name           = "CX24228/S5H1411-2 (TOP)",
 238                         .i2c_bus_nr     = SAA7164_I2C_BUS_2,
 239                         .i2c_bus_addr   = 0x32 >> 1,
 240                         .i2c_reg_len    = REGLEN_8bit,
 241                 }, {
 242                         .id             = 0x23,
 243                         .type           = SAA7164_UNIT_DIGITAL_DEMODULATOR,
 244                         .name           = "CX24228/S5H1411-2 (QAM)",
 245                         .i2c_bus_nr     = SAA7164_I2C_BUS_2,
 246                         .i2c_bus_addr   = 0x34 >> 1,
 247                         .i2c_reg_len    = REGLEN_8bit,
 248                 } },
 249         },
 250         [SAA7164_BOARD_HAUPPAUGE_HVR2250_2] = {
 251                 .name           = "Hauppauge WinTV-HVR2250",
 252                 .porta          = SAA7164_MPEG_DVB,
 253                 .portb          = SAA7164_MPEG_DVB,
 254                 .chiprev        = SAA7164_CHIP_REV3,
 255                 .unit           = {{
 256                         .id             = 0x22,
 257                         .type           = SAA7164_UNIT_EEPROM,
 258                         .name           = "4K EEPROM",
 259                         .i2c_bus_nr     = SAA7164_I2C_BUS_0,
 260                         .i2c_bus_addr   = 0xa0 >> 1,
 261                         .i2c_reg_len    = REGLEN_8bit,
 262                 }, {
 263                         .id             = 0x04,
 264                         .type           = SAA7164_UNIT_TUNER,
 265                         .name           = "TDA18271-1",
 266                         .i2c_bus_nr     = SAA7164_I2C_BUS_1,
 267                         .i2c_bus_addr   = 0xc0 >> 1,
 268                         .i2c_reg_len    = REGLEN_8bit,
 269                 }, {
 270                         .id             = 0x07,
 271                         .type           = SAA7164_UNIT_DIGITAL_DEMODULATOR,
 272                         .name           = "CX24228/S5H1411-1 (TOP)",
 273                         .i2c_bus_nr     = SAA7164_I2C_BUS_1,
 274                         .i2c_bus_addr   = 0x32 >> 1,
 275                         .i2c_reg_len    = REGLEN_8bit,
 276                 }, {
 277                         .id             = 0x08,
 278                         .type           = SAA7164_UNIT_DIGITAL_DEMODULATOR,
 279                         .name           = "CX24228/S5H1411-1 (QAM)",
 280                         .i2c_bus_nr     = SAA7164_I2C_BUS_1,
 281                         .i2c_bus_addr   = 0x34 >> 1,
 282                         .i2c_reg_len    = REGLEN_8bit,
 283                 }, {
 284                         .id             = 0x24,
 285                         .type           = SAA7164_UNIT_TUNER,
 286                         .name           = "TDA18271-2",
 287                         .i2c_bus_nr     = SAA7164_I2C_BUS_2,
 288                         .i2c_bus_addr   = 0xc0 >> 1,
 289                         .i2c_reg_len    = REGLEN_8bit,
 290                 }, {
 291                         .id             = 0x26,
 292                         .type           = SAA7164_UNIT_DIGITAL_DEMODULATOR,
 293                         .name           = "CX24228/S5H1411-2 (TOP)",
 294                         .i2c_bus_nr     = SAA7164_I2C_BUS_2,
 295                         .i2c_bus_addr   = 0x32 >> 1,
 296                         .i2c_reg_len    = REGLEN_8bit,
 297                 }, {
 298                         .id             = 0x29,
 299                         .type           = SAA7164_UNIT_DIGITAL_DEMODULATOR,
 300                         .name           = "CX24228/S5H1411-2 (QAM)",
 301                         .i2c_bus_nr     = SAA7164_I2C_BUS_2,
 302                         .i2c_bus_addr   = 0x34 >> 1,
 303                         .i2c_reg_len    = REGLEN_8bit,
 304                 } },
 305         },
 306 };
 307 const unsigned int saa7164_bcount = ARRAY_SIZE(saa7164_boards);
 308
 309 /* ------------------------------------------------------------------ */
 310 /* PCI subsystem IDs                                                  */
 311
 312 struct saa7164_subid saa7164_subids[] = {
 313         {
 314                 .subvendor = 0x0070,
 315                 .subdevice = 0x8880,
 316                 .card      = SAA7164_BOARD_HAUPPAUGE_HVR2250,
 317         }, {
 318                 .subvendor = 0x0070,
 319                 .subdevice = 0x8810,
 320                 .card      = SAA7164_BOARD_HAUPPAUGE_HVR2250,
 321         }, {
 322                 .subvendor = 0x0070,
 323                 .subdevice = 0x8980,
 324                 .card      = SAA7164_BOARD_HAUPPAUGE_HVR2200,
 325         }, {
 326                 .subvendor = 0x0070,
 327                 .subdevice = 0x8900,
 328                 .card      = SAA7164_BOARD_HAUPPAUGE_HVR2200_2,
 329         }, {
 330                 .subvendor = 0x0070,
 331                 .subdevice = 0x8901,
 332                 .card      = SAA7164_BOARD_HAUPPAUGE_HVR2200_3,
 333         }, {
 334                 .subvendor = 0x0070,
 335                 .subdevice = 0x88A1,
 336                 .card      = SAA7164_BOARD_HAUPPAUGE_HVR2250_2,
 337         }, {
 338                 .subvendor = 0x0070,
 339                 .subdevice = 0x8891,
 340                 .card      = SAA7164_BOARD_HAUPPAUGE_HVR2250_2,
 341         },
 342 };
 343 const unsigned int saa7164_idcount = ARRAY_SIZE(saa7164_subids);
 344
 345 void saa7164_card_list(struct saa7164_dev *dev)
 346 {
 347         int i;
 348
 349         if (0 == dev->pci->subsystem_vendor &&
 350             0 == dev->pci->subsystem_device) {
 351                 printk(KERN_ERR
 352                         "%s: Board has no valid PCIe Subsystem ID and can't\n"
 353                         "%s: be autodetected. Pass card=<n> insmod option to\n"
 354                         "%s: workaround that. Send complaints to the vendor\n"
 355                         "%s: of the TV card. Best regards,\n"
 356                         "%s:         -- tux\n",
 357                         dev->name, dev->name, dev->name, dev->name, dev->name);
 358         } else {
 359                 printk(KERN_ERR
 360                         "%s: Your board isn't known (yet) to the driver.\n"
 361                         "%s: Try to pick one of the existing card configs via\n"
 362                         "%s: card=<n> insmod option.  Updating to the latest\n"
 363                         "%s: version might help as well.\n",
 364                         dev->name, dev->name, dev->name, dev->name);
 365         }
 366
 367         printk(KERN_ERR "%s: Here are valid choices for the card=<n> insmod "
 368                 "option:\n", dev->name);
 369
 370         for (i = 0; i < saa7164_bcount; i++)
 371                 printk(KERN_ERR "%s:    card=%d -> %s\n",
 372                        dev->name, i, saa7164_boards[i].name);
 373 }
 374
 375 /* TODO: clean this define up into the -cards.c structs */
 376 #define PCIEBRIDGE_UNITID 2
 377
 378 void saa7164_gpio_setup(struct saa7164_dev *dev)
 379 {
 380
 381
 382         switch (dev->board) {
 383         case SAA7164_BOARD_HAUPPAUGE_HVR2200:
 384         case SAA7164_BOARD_HAUPPAUGE_HVR2200_2:
 385         case SAA7164_BOARD_HAUPPAUGE_HVR2200_3:
 386         case SAA7164_BOARD_HAUPPAUGE_HVR2250:
 387         case SAA7164_BOARD_HAUPPAUGE_HVR2250_2:
 388                 /*
 389                 GPIO 2: s5h1411 / tda10048-1 demod reset
 390                 GPIO 3: s5h1411 / tda10048-2 demod reset
 391                 GPIO 7: IRBlaster Zilog reset
 392                  */
 393
 394                 /* Reset parts by going in and out of reset */
 395                 saa7164_api_clear_gpiobit(dev, PCIEBRIDGE_UNITID, 2);
 396                 saa7164_api_clear_gpiobit(dev, PCIEBRIDGE_UNITID, 3);
 397
 398                 msleep(10);
 399
 400                 saa7164_api_set_gpiobit(dev, PCIEBRIDGE_UNITID, 2);
 401                 saa7164_api_set_gpiobit(dev, PCIEBRIDGE_UNITID, 3);
 402                 break;
 403         }
 404
 405 }
 406
 407 static void hauppauge_eeprom(struct saa7164_dev *dev, u8 *eeprom_data)
 408 {
 409         struct tveeprom tv;
 410
 411         /* TODO: Assumption: eeprom on bus 0 */
 412         tveeprom_hauppauge_analog(&dev->i2c_bus[0].i2c_client, &tv,
 413                 eeprom_data);
 414
 415         /* Make sure we support the board model */
 416         switch (tv.model) {
 417         case 88001:
 418                 /* Development board - Limit circulation */
 419                 /* WinTV-HVR2250 (PCIe, Retail, full-height bracket)
 420                  * ATSC/QAM (TDA18271/S5H1411) and basic analog, no IR, FM */
 421         case 88021:
 422                 /* WinTV-HVR2250 (PCIe, Retail, full-height bracket)
 423                  * ATSC/QAM (TDA18271/S5H1411) and basic analog, MCE CIR, FM */
 424                 break;
 425         case 88041:
 426                 /* WinTV-HVR2250 (PCIe, Retail, full-height bracket)
 427                  * ATSC/QAM (TDA18271/S5H1411) and basic analog, no IR, FM */
 428                 break;
 429         case 88061:
 430                 /* WinTV-HVR2250 (PCIe, Retail, full-height bracket)
 431                  * ATSC/QAM (TDA18271/S5H1411) and basic analog, FM */
 432                 break;
 433         case 89519:
 434         case 89609:
 435                 /* WinTV-HVR2200 (PCIe, Retail, full-height)
 436                  * DVB-T (TDA18271/TDA10048) and basic analog, no IR */
 437                 break;
 438         case 89619:
 439                 /* WinTV-HVR2200 (PCIe, Retail, half-height)
 440                  * DVB-T (TDA18271/TDA10048) and basic analog, no IR */
 441                 break;
 442         default:
 443                 printk(KERN_ERR "%s: Warning: Unknown Hauppauge model #%d\n",
 444                         dev->name, tv.model);
 445                 break;
 446         }
 447
 448         printk(KERN_INFO "%s: Hauppauge eeprom: model=%d\n", dev->name,
 449                 tv.model);
 450 }
 451
 452 void saa7164_card_setup(struct saa7164_dev *dev)
 453 {
 454         static u8 eeprom[256];
 455
 456         if (dev->i2c_bus[0].i2c_rc == 0) {
 457                 if (saa7164_api_read_eeprom(dev, &eeprom[0],
 458                         sizeof(eeprom)) < 0)
 459                         return;
 460         }
 461
 462         switch (dev->board) {
 463         case SAA7164_BOARD_HAUPPAUGE_HVR2200:
 464         case SAA7164_BOARD_HAUPPAUGE_HVR2200_2:
 465         case SAA7164_BOARD_HAUPPAUGE_HVR2200_3:
 466         case SAA7164_BOARD_HAUPPAUGE_HVR2250:
 467         case SAA7164_BOARD_HAUPPAUGE_HVR2250_2:
 468                 hauppauge_eeprom(dev, &eeprom[0]);
 469                 break;
 470         }
 471 }
 472
 473 /* With most other drivers, the kernel expects to communicate with subdrivers
 474  * through i2c. This bridge does not allow that, it does not expose any direct
 475  * access to I2C. Instead we have to communicate through the device f/w for
 476  * register access to 'processing units'. Each unit has a unique
 477  * id, regardless of how the physical implementation occurs across
 478  * the three physical i2c busses. The being said if we want leverge of
 479  * the existing kernel drivers for tuners and demods we have to 'speak i2c',
 480  * to this bridge implements 3 virtual i2c buses. This is a helper function
 481  * for those.
 482  *
 483  * Description: Translate the kernels notion of an i2c address and bus into
 484  * the appropriate unitid.
 485  */
 486 int saa7164_i2caddr_to_unitid(struct saa7164_i2c *bus, int addr)
 487 {
 488         /* For a given bus and i2c device address, return the saa7164 unique
 489          * unitid. < 0 on error */
 490
 491         struct saa7164_dev *dev = bus->dev;
 492         struct saa7164_unit *unit;
 493         int i;
 494
 495         for (i = 0; i < SAA7164_MAX_UNITS; i++) {
 496                 unit = &saa7164_boards[dev->board].unit[i];
 497
 498                 if (unit->type == SAA7164_UNIT_UNDEFINED)
 499                         continue;
 500                 if ((bus->nr == unit->i2c_bus_nr) &&
 501                         (addr == unit->i2c_bus_addr))
 502                         return unit->id;
 503         }
 504
 505         return -1;
 506 }
 507
 508 /* The 7164 API needs to know the i2c register length in advance.
 509  * this is a helper function. Based on a specific chip addr and bus return the
 510  * reg length.
 511  */
 512 int saa7164_i2caddr_to_reglen(struct saa7164_i2c *bus, int addr)
 513 {
 514         /* For a given bus and i2c device address, return the
 515          * saa7164 registry address width. < 0 on error
 516          */
 517
 518         struct saa7164_dev *dev = bus->dev;
 519         struct saa7164_unit *unit;
 520         int i;
 521
 522         for (i = 0; i < SAA7164_MAX_UNITS; i++) {
 523                 unit = &saa7164_boards[dev->board].unit[i];
 524
 525                 if (unit->type == SAA7164_UNIT_UNDEFINED)
 526                         continue;
 527
 528                 if ((bus->nr == unit->i2c_bus_nr) &&
 529                         (addr == unit->i2c_bus_addr))
 530                         return unit->i2c_reg_len;
 531         }
 532
 533         return -1;
 534 }
 535 /* TODO: implement a 'findeeprom' functio like the above and fix any other
 536  * eeprom related todo's in -api.c.
 537  */
 538
 539 /* Translate a unitid into a x readable device name, for display purposes.  */
 540 char *saa7164_unitid_name(struct saa7164_dev *dev, u8 unitid)
 541 {
 542         char *undefed = "UNDEFINED";
 543         char *bridge = "BRIDGE";
 544         struct saa7164_unit *unit;
 545         int i;
 546
 547         if (unitid == 0)
 548                 return bridge;
 549
 550         for (i = 0; i < SAA7164_MAX_UNITS; i++) {
 551                 unit = &saa7164_boards[dev->board].unit[i];
 552
 553                 if (unit->type == SAA7164_UNIT_UNDEFINED)
 554                         continue;
 555
 556                 if (unitid == unit->id)
 557                                 return unit->name;
 558         }
 559
 560         return undefed;
 561 }
 562