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   1 /*
   2  *  saa7191.c - Philips SAA7191 video decoder driver
   3  *
   4  *  Copyright (C) 2003 Ladislav Michl <ladis@linux-mips.org>
   5  *  Copyright (C) 2004,2005 Mikael Nousiainen <tmnousia@cc.hut.fi>
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License version 2 as
   9  *  published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/delay.h>
  13 #include <linux/errno.h>
  14 #include <linux/fs.h>
  15 #include <linux/init.h>
  16 #include <linux/kernel.h>
  17 #include <linux/major.h>
  18 #include <linux/module.h>
  19 #include <linux/mm.h>
  20 #include <linux/slab.h>
  21
  22 #include <linux/videodev2.h>
  23 #include <linux/i2c.h>
  24 #include <media/v4l2-device.h>
  25 #include <media/v4l2-chip-ident.h>
  26 #include <media/v4l2-i2c-drv.h>
  27
  28 #include "saa7191.h"
  29
  30 #define SAA7191_MODULE_VERSION  "0.0.5"
  31
  32 MODULE_DESCRIPTION("Philips SAA7191 video decoder driver");
  33 MODULE_VERSION(SAA7191_MODULE_VERSION);
  34 MODULE_AUTHOR("Mikael Nousiainen <tmnousia@cc.hut.fi>");
  35 MODULE_LICENSE("GPL");
  36
  37
  38 // #define SAA7191_DEBUG
  39
  40 #ifdef SAA7191_DEBUG
  41 #define dprintk(x...) printk("SAA7191: " x);
  42 #else
  43 #define dprintk(x...)
  44 #endif
  45
  46 #define SAA7191_SYNC_COUNT      30
  47 #define SAA7191_SYNC_DELAY      100     /* milliseconds */
  48
  49 struct saa7191 {
  50         struct v4l2_subdev sd;
  51
  52         /* the register values are stored here as the actual
  53          * I2C-registers are write-only */
  54         u8 reg[25];
  55
  56         int input;
  57         v4l2_std_id norm;
  58 };
  59
  60 static inline struct saa7191 *to_saa7191(struct v4l2_subdev *sd)
  61 {
  62         return container_of(sd, struct saa7191, sd);
  63 }
  64
  65 static const u8 initseq[] = {
  66         0,      /* Subaddress */
  67
  68         0x50,   /* (0x50) SAA7191_REG_IDEL */
  69
  70         /* 50 Hz signal timing */
  71         0x30,   /* (0x30) SAA7191_REG_HSYB */
  72         0x00,   /* (0x00) SAA7191_REG_HSYS */
  73         0xe8,   /* (0xe8) SAA7191_REG_HCLB */
  74         0xb6,   /* (0xb6) SAA7191_REG_HCLS */
  75         0xf4,   /* (0xf4) SAA7191_REG_HPHI */
  76
  77         /* control */
  78         SAA7191_LUMA_APER_1,    /* (0x01) SAA7191_REG_LUMA - CVBS mode */
  79         0x00,   /* (0x00) SAA7191_REG_HUEC */
  80         0xf8,   /* (0xf8) SAA7191_REG_CKTQ */
  81         0xf8,   /* (0xf8) SAA7191_REG_CKTS */
  82         0x90,   /* (0x90) SAA7191_REG_PLSE */
  83         0x90,   /* (0x90) SAA7191_REG_SESE */
  84         0x00,   /* (0x00) SAA7191_REG_GAIN */
  85         SAA7191_STDC_NFEN | SAA7191_STDC_HRMV,  /* (0x0c) SAA7191_REG_STDC
  86                                                  * - not SECAM,
  87                                                  * slow time constant */
  88         SAA7191_IOCK_OEDC | SAA7191_IOCK_OEHS | SAA7191_IOCK_OEVS
  89         | SAA7191_IOCK_OEDY,    /* (0x78) SAA7191_REG_IOCK
  90                                  * - chroma from CVBS, GPSW1 & 2 off */
  91         SAA7191_CTL3_AUFD | SAA7191_CTL3_SCEN | SAA7191_CTL3_OFTS
  92         | SAA7191_CTL3_YDEL0,   /* (0x99) SAA7191_REG_CTL3
  93                                  * - automatic field detection */
  94         0x00,   /* (0x00) SAA7191_REG_CTL4 */
  95         0x2c,   /* (0x2c) SAA7191_REG_CHCV - PAL nominal value */
  96         0x00,   /* unused */
  97         0x00,   /* unused */
  98
  99         /* 60 Hz signal timing */
 100         0x34,   /* (0x34) SAA7191_REG_HS6B */
 101         0x0a,   /* (0x0a) SAA7191_REG_HS6S */
 102         0xf4,   /* (0xf4) SAA7191_REG_HC6B */
 103         0xce,   /* (0xce) SAA7191_REG_HC6S */
 104         0xf4,   /* (0xf4) SAA7191_REG_HP6I */
 105 };
 106
 107 /* SAA7191 register handling */
 108
 109 static u8 saa7191_read_reg(struct v4l2_subdev *sd, u8 reg)
 110 {
 111         return to_saa7191(sd)->reg[reg];
 112 }
 113
 114 static int saa7191_read_status(struct v4l2_subdev *sd, u8 *value)
 115 {
 116         struct i2c_client *client = v4l2_get_subdevdata(sd);
 117         int ret;
 118
 119         ret = i2c_master_recv(client, value, 1);
 120         if (ret < 0) {
 121                 printk(KERN_ERR "SAA7191: saa7191_read_status(): read failed\n");
 122                 return ret;
 123         }
 124
 125         return 0;
 126 }
 127
 128
 129 static int saa7191_write_reg(struct v4l2_subdev *sd, u8 reg, u8 value)
 130 {
 131         struct i2c_client *client = v4l2_get_subdevdata(sd);
 132
 133         to_saa7191(sd)->reg[reg] = value;
 134         return i2c_smbus_write_byte_data(client, reg, value);
 135 }
 136
 137 /* the first byte of data must be the first subaddress number (register) */
 138 static int saa7191_write_block(struct v4l2_subdev *sd,
 139                                u8 length, const u8 *data)
 140 {
 141         struct i2c_client *client = v4l2_get_subdevdata(sd);
 142         struct saa7191 *decoder = to_saa7191(sd);
 143         int i;
 144         int ret;
 145
 146         for (i = 0; i < (length - 1); i++) {
 147                 decoder->reg[data[0] + i] = data[i + 1];
 148         }
 149
 150         ret = i2c_master_send(client, data, length);
 151         if (ret < 0) {
 152                 printk(KERN_ERR "SAA7191: saa7191_write_block(): "
 153                        "write failed\n");
 154                 return ret;
 155         }
 156
 157         return 0;
 158 }
 159
 160 /* Helper functions */
 161
 162 static int saa7191_s_routing(struct v4l2_subdev *sd,
 163                              u32 input, u32 output, u32 config)
 164 {
 165         struct saa7191 *decoder = to_saa7191(sd);
 166         u8 luma = saa7191_read_reg(sd, SAA7191_REG_LUMA);
 167         u8 iock = saa7191_read_reg(sd, SAA7191_REG_IOCK);
 168         int err;
 169
 170         switch (input) {
 171         case SAA7191_INPUT_COMPOSITE: /* Set Composite input */
 172                 iock &= ~(SAA7191_IOCK_CHRS | SAA7191_IOCK_GPSW1
 173                           | SAA7191_IOCK_GPSW2);
 174                 /* Chrominance trap active */
 175                 luma &= ~SAA7191_LUMA_BYPS;
 176                 break;
 177         case SAA7191_INPUT_SVIDEO: /* Set S-Video input */
 178                 iock |= SAA7191_IOCK_CHRS | SAA7191_IOCK_GPSW2;
 179                 /* Chrominance trap bypassed */
 180                 luma |= SAA7191_LUMA_BYPS;
 181                 break;
 182         default:
 183                 return -EINVAL;
 184         }
 185
 186         err = saa7191_write_reg(sd, SAA7191_REG_LUMA, luma);
 187         if (err)
 188                 return -EIO;
 189         err = saa7191_write_reg(sd, SAA7191_REG_IOCK, iock);
 190         if (err)
 191                 return -EIO;
 192
 193         decoder->input = input;
 194
 195         return 0;
 196 }
 197
 198 static int saa7191_s_std(struct v4l2_subdev *sd, v4l2_std_id norm)
 199 {
 200         struct saa7191 *decoder = to_saa7191(sd);
 201         u8 stdc = saa7191_read_reg(sd, SAA7191_REG_STDC);
 202         u8 ctl3 = saa7191_read_reg(sd, SAA7191_REG_CTL3);
 203         u8 chcv = saa7191_read_reg(sd, SAA7191_REG_CHCV);
 204         int err;
 205
 206         if (norm & V4L2_STD_PAL) {
 207                 stdc &= ~SAA7191_STDC_SECS;
 208                 ctl3 &= ~(SAA7191_CTL3_AUFD | SAA7191_CTL3_FSEL);
 209                 chcv = SAA7191_CHCV_PAL;
 210         } else if (norm & V4L2_STD_NTSC) {
 211                 stdc &= ~SAA7191_STDC_SECS;
 212                 ctl3 &= ~SAA7191_CTL3_AUFD;
 213                 ctl3 |= SAA7191_CTL3_FSEL;
 214                 chcv = SAA7191_CHCV_NTSC;
 215         } else if (norm & V4L2_STD_SECAM) {
 216                 stdc |= SAA7191_STDC_SECS;
 217                 ctl3 &= ~(SAA7191_CTL3_AUFD | SAA7191_CTL3_FSEL);
 218                 chcv = SAA7191_CHCV_PAL;
 219         } else {
 220                 return -EINVAL;
 221         }
 222
 223         err = saa7191_write_reg(sd, SAA7191_REG_CTL3, ctl3);
 224         if (err)
 225                 return -EIO;
 226         err = saa7191_write_reg(sd, SAA7191_REG_STDC, stdc);
 227         if (err)
 228                 return -EIO;
 229         err = saa7191_write_reg(sd, SAA7191_REG_CHCV, chcv);
 230         if (err)
 231                 return -EIO;
 232
 233         decoder->norm = norm;
 234
 235         dprintk("ctl3: %02x stdc: %02x chcv: %02x\n", ctl3,
 236                 stdc, chcv);
 237         dprintk("norm: %llx\n", norm);
 238
 239         return 0;
 240 }
 241
 242 static int saa7191_wait_for_signal(struct v4l2_subdev *sd, u8 *status)
 243 {
 244         int i = 0;
 245
 246         dprintk("Checking for signal...\n");
 247
 248         for (i = 0; i < SAA7191_SYNC_COUNT; i++) {
 249                 if (saa7191_read_status(sd, status))
 250                         return -EIO;
 251
 252                 if (((*status) & SAA7191_STATUS_HLCK) == 0) {
 253                         dprintk("Signal found\n");
 254                         return 0;
 255                 }
 256
 257                 msleep(SAA7191_SYNC_DELAY);
 258         }
 259
 260         dprintk("No signal\n");
 261
 262         return -EBUSY;
 263 }
 264
 265 static int saa7191_querystd(struct v4l2_subdev *sd, v4l2_std_id *norm)
 266 {
 267         struct saa7191 *decoder = to_saa7191(sd);
 268         u8 stdc = saa7191_read_reg(sd, SAA7191_REG_STDC);
 269         u8 ctl3 = saa7191_read_reg(sd, SAA7191_REG_CTL3);
 270         u8 status;
 271         v4l2_std_id old_norm = decoder->norm;
 272         int err = 0;
 273
 274         dprintk("SAA7191 extended signal auto-detection...\n");
 275
 276         *norm = V4L2_STD_NTSC | V4L2_STD_PAL | V4L2_STD_SECAM;
 277         stdc &= ~SAA7191_STDC_SECS;
 278         ctl3 &= ~(SAA7191_CTL3_FSEL);
 279
 280         err = saa7191_write_reg(sd, SAA7191_REG_STDC, stdc);
 281         if (err) {
 282                 err = -EIO;
 283                 goto out;
 284         }
 285         err = saa7191_write_reg(sd, SAA7191_REG_CTL3, ctl3);
 286         if (err) {
 287                 err = -EIO;
 288                 goto out;
 289         }
 290
 291         ctl3 |= SAA7191_CTL3_AUFD;
 292         err = saa7191_write_reg(sd, SAA7191_REG_CTL3, ctl3);
 293         if (err) {
 294                 err = -EIO;
 295                 goto out;
 296         }
 297
 298         msleep(SAA7191_SYNC_DELAY);
 299
 300         err = saa7191_wait_for_signal(sd, &status);
 301         if (err)
 302                 goto out;
 303
 304         if (status & SAA7191_STATUS_FIDT) {
 305                 /* 60Hz signal -> NTSC */
 306                 dprintk("60Hz signal: NTSC\n");
 307                 *norm = V4L2_STD_NTSC;
 308                 return 0;
 309         }
 310
 311         /* 50Hz signal */
 312         dprintk("50Hz signal: Trying PAL...\n");
 313
 314         /* try PAL first */
 315         err = saa7191_s_std(sd, V4L2_STD_PAL);
 316         if (err)
 317                 goto out;
 318
 319         msleep(SAA7191_SYNC_DELAY);
 320
 321         err = saa7191_wait_for_signal(sd, &status);
 322         if (err)
 323                 goto out;
 324
 325         /* not 50Hz ? */
 326         if (status & SAA7191_STATUS_FIDT) {
 327                 dprintk("No 50Hz signal\n");
 328                 saa7191_s_std(sd, old_norm);
 329                 return -EAGAIN;
 330         }
 331
 332         if (status & SAA7191_STATUS_CODE) {
 333                 dprintk("PAL\n");
 334                 *norm = V4L2_STD_PAL;
 335                 return saa7191_s_std(sd, old_norm);
 336         }
 337
 338         dprintk("No color detected with PAL - Trying SECAM...\n");
 339
 340         /* no color detected ? -> try SECAM */
 341         err = saa7191_s_std(sd, V4L2_STD_SECAM);
 342         if (err)
 343                 goto out;
 344
 345         msleep(SAA7191_SYNC_DELAY);
 346
 347         err = saa7191_wait_for_signal(sd, &status);
 348         if (err)
 349                 goto out;
 350
 351         /* not 50Hz ? */
 352         if (status & SAA7191_STATUS_FIDT) {
 353                 dprintk("No 50Hz signal\n");
 354                 err = -EAGAIN;
 355                 goto out;
 356         }
 357
 358         if (status & SAA7191_STATUS_CODE) {
 359                 /* Color detected -> SECAM */
 360                 dprintk("SECAM\n");
 361                 *norm = V4L2_STD_SECAM;
 362                 return saa7191_s_std(sd, old_norm);
 363         }
 364
 365         dprintk("No color detected with SECAM - Going back to PAL.\n");
 366
 367 out:
 368         return saa7191_s_std(sd, old_norm);
 369 }
 370
 371 static int saa7191_autodetect_norm(struct v4l2_subdev *sd)
 372 {
 373         u8 status;
 374
 375         dprintk("SAA7191 signal auto-detection...\n");
 376
 377         dprintk("Reading status...\n");
 378
 379         if (saa7191_read_status(sd, &status))
 380                 return -EIO;
 381
 382         dprintk("Checking for signal...\n");
 383
 384         /* no signal ? */
 385         if (status & SAA7191_STATUS_HLCK) {
 386                 dprintk("No signal\n");
 387                 return -EBUSY;
 388         }
 389
 390         dprintk("Signal found\n");
 391
 392         if (status & SAA7191_STATUS_FIDT) {
 393                 /* 60hz signal -> NTSC */
 394                 dprintk("NTSC\n");
 395                 return saa7191_s_std(sd, V4L2_STD_NTSC);
 396         } else {
 397                 /* 50hz signal -> PAL */
 398                 dprintk("PAL\n");
 399                 return saa7191_s_std(sd, V4L2_STD_PAL);
 400         }
 401 }
 402
 403 static int saa7191_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 404 {
 405         u8 reg;
 406         int ret = 0;
 407
 408         switch (ctrl->id) {
 409         case SAA7191_CONTROL_BANDPASS:
 410         case SAA7191_CONTROL_BANDPASS_WEIGHT:
 411         case SAA7191_CONTROL_CORING:
 412                 reg = saa7191_read_reg(sd, SAA7191_REG_LUMA);
 413                 switch (ctrl->id) {
 414                 case SAA7191_CONTROL_BANDPASS:
 415                         ctrl->value = ((s32)reg & SAA7191_LUMA_BPSS_MASK)
 416                                 >> SAA7191_LUMA_BPSS_SHIFT;
 417                         break;
 418                 case SAA7191_CONTROL_BANDPASS_WEIGHT:
 419                         ctrl->value = ((s32)reg & SAA7191_LUMA_APER_MASK)
 420                                 >> SAA7191_LUMA_APER_SHIFT;
 421                         break;
 422                 case SAA7191_CONTROL_CORING:
 423                         ctrl->value = ((s32)reg & SAA7191_LUMA_CORI_MASK)
 424                                 >> SAA7191_LUMA_CORI_SHIFT;
 425                         break;
 426                 }
 427                 break;
 428         case SAA7191_CONTROL_FORCE_COLOUR:
 429         case SAA7191_CONTROL_CHROMA_GAIN:
 430                 reg = saa7191_read_reg(sd, SAA7191_REG_GAIN);
 431                 if (ctrl->id == SAA7191_CONTROL_FORCE_COLOUR)
 432                         ctrl->value = ((s32)reg & SAA7191_GAIN_COLO) ? 1 : 0;
 433                 else
 434                         ctrl->value = ((s32)reg & SAA7191_GAIN_LFIS_MASK)
 435                                 >> SAA7191_GAIN_LFIS_SHIFT;
 436                 break;
 437         case V4L2_CID_HUE:
 438                 reg = saa7191_read_reg(sd, SAA7191_REG_HUEC);
 439                 if (reg < 0x80)
 440                         reg += 0x80;
 441                 else
 442                         reg -= 0x80;
 443                 ctrl->value = (s32)reg;
 444                 break;
 445         case SAA7191_CONTROL_VTRC:
 446                 reg = saa7191_read_reg(sd, SAA7191_REG_STDC);
 447                 ctrl->value = ((s32)reg & SAA7191_STDC_VTRC) ? 1 : 0;
 448                 break;
 449         case SAA7191_CONTROL_LUMA_DELAY:
 450                 reg = saa7191_read_reg(sd, SAA7191_REG_CTL3);
 451                 ctrl->value = ((s32)reg & SAA7191_CTL3_YDEL_MASK)
 452                         >> SAA7191_CTL3_YDEL_SHIFT;
 453                 if (ctrl->value >= 4)
 454                         ctrl->value -= 8;
 455                 break;
 456         case SAA7191_CONTROL_VNR:
 457                 reg = saa7191_read_reg(sd, SAA7191_REG_CTL4);
 458                 ctrl->value = ((s32)reg & SAA7191_CTL4_VNOI_MASK)
 459                         >> SAA7191_CTL4_VNOI_SHIFT;
 460                 break;
 461         default:
 462                 ret = -EINVAL;
 463         }
 464
 465         return ret;
 466 }
 467
 468 static int saa7191_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 469 {
 470         u8 reg;
 471         int ret = 0;
 472
 473         switch (ctrl->id) {
 474         case SAA7191_CONTROL_BANDPASS:
 475         case SAA7191_CONTROL_BANDPASS_WEIGHT:
 476         case SAA7191_CONTROL_CORING:
 477                 reg = saa7191_read_reg(sd, SAA7191_REG_LUMA);
 478                 switch (ctrl->id) {
 479                 case SAA7191_CONTROL_BANDPASS:
 480                         reg &= ~SAA7191_LUMA_BPSS_MASK;
 481                         reg |= (ctrl->value << SAA7191_LUMA_BPSS_SHIFT)
 482                                 & SAA7191_LUMA_BPSS_MASK;
 483                         break;
 484                 case SAA7191_CONTROL_BANDPASS_WEIGHT:
 485                         reg &= ~SAA7191_LUMA_APER_MASK;
 486                         reg |= (ctrl->value << SAA7191_LUMA_APER_SHIFT)
 487                                 & SAA7191_LUMA_APER_MASK;
 488                         break;
 489                 case SAA7191_CONTROL_CORING:
 490                         reg &= ~SAA7191_LUMA_CORI_MASK;
 491                         reg |= (ctrl->value << SAA7191_LUMA_CORI_SHIFT)
 492                                 & SAA7191_LUMA_CORI_MASK;
 493                         break;
 494                 }
 495                 ret = saa7191_write_reg(sd, SAA7191_REG_LUMA, reg);
 496                 break;
 497         case SAA7191_CONTROL_FORCE_COLOUR:
 498         case SAA7191_CONTROL_CHROMA_GAIN:
 499                 reg = saa7191_read_reg(sd, SAA7191_REG_GAIN);
 500                 if (ctrl->id == SAA7191_CONTROL_FORCE_COLOUR) {
 501                         if (ctrl->value)
 502                                 reg |= SAA7191_GAIN_COLO;
 503                         else
 504                                 reg &= ~SAA7191_GAIN_COLO;
 505                 } else {
 506                         reg &= ~SAA7191_GAIN_LFIS_MASK;
 507                         reg |= (ctrl->value << SAA7191_GAIN_LFIS_SHIFT)
 508                                 & SAA7191_GAIN_LFIS_MASK;
 509                 }
 510                 ret = saa7191_write_reg(sd, SAA7191_REG_GAIN, reg);
 511                 break;
 512         case V4L2_CID_HUE:
 513                 reg = ctrl->value & 0xff;
 514                 if (reg < 0x80)
 515                         reg += 0x80;
 516                 else
 517                         reg -= 0x80;
 518                 ret = saa7191_write_reg(sd, SAA7191_REG_HUEC, reg);
 519                 break;
 520         case SAA7191_CONTROL_VTRC:
 521                 reg = saa7191_read_reg(sd, SAA7191_REG_STDC);
 522                 if (ctrl->value)
 523                         reg |= SAA7191_STDC_VTRC;
 524                 else
 525                         reg &= ~SAA7191_STDC_VTRC;
 526                 ret = saa7191_write_reg(sd, SAA7191_REG_STDC, reg);
 527                 break;
 528         case SAA7191_CONTROL_LUMA_DELAY: {
 529                 s32 value = ctrl->value;
 530                 if (value < 0)
 531                         value += 8;
 532                 reg = saa7191_read_reg(sd, SAA7191_REG_CTL3);
 533                 reg &= ~SAA7191_CTL3_YDEL_MASK;
 534                 reg |= (value << SAA7191_CTL3_YDEL_SHIFT)
 535                         & SAA7191_CTL3_YDEL_MASK;
 536                 ret = saa7191_write_reg(sd, SAA7191_REG_CTL3, reg);
 537                 break;
 538         }
 539         case SAA7191_CONTROL_VNR:
 540                 reg = saa7191_read_reg(sd, SAA7191_REG_CTL4);
 541                 reg &= ~SAA7191_CTL4_VNOI_MASK;
 542                 reg |= (ctrl->value << SAA7191_CTL4_VNOI_SHIFT)
 543                         & SAA7191_CTL4_VNOI_MASK;
 544                 ret = saa7191_write_reg(sd, SAA7191_REG_CTL4, reg);
 545                 break;
 546         default:
 547                 ret = -EINVAL;
 548         }
 549
 550         return ret;
 551 }
 552
 553 /* I2C-interface */
 554
 555 static int saa7191_g_input_status(struct v4l2_subdev *sd, u32 *status)
 556 {
 557         u8 status_reg;
 558         int res = V4L2_IN_ST_NO_SIGNAL;
 559
 560         if (saa7191_read_status(sd, &status_reg))
 561                 return -EIO;
 562         if ((status_reg & SAA7191_STATUS_HLCK) == 0)
 563                 res = 0;
 564         if (!(status_reg & SAA7191_STATUS_CODE))
 565                 res |= V4L2_IN_ST_NO_COLOR;
 566         *status = res;
 567         return 0;
 568 }
 569
 570
 571 static int saa7191_g_chip_ident(struct v4l2_subdev *sd,
 572                 struct v4l2_dbg_chip_ident *chip)
 573 {
 574         struct i2c_client *client = v4l2_get_subdevdata(sd);
 575
 576         return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_SAA7191, 0);
 577 }
 578
 579 /* ----------------------------------------------------------------------- */
 580
 581 static const struct v4l2_subdev_core_ops saa7191_core_ops = {
 582         .g_chip_ident = saa7191_g_chip_ident,
 583         .g_ctrl = saa7191_g_ctrl,
 584         .s_ctrl = saa7191_s_ctrl,
 585         .s_std = saa7191_s_std,
 586 };
 587
 588 static const struct v4l2_subdev_video_ops saa7191_video_ops = {
 589         .s_routing = saa7191_s_routing,
 590         .querystd = saa7191_querystd,
 591         .g_input_status = saa7191_g_input_status,
 592 };
 593
 594 static const struct v4l2_subdev_ops saa7191_ops = {
 595         .core = &saa7191_core_ops,
 596         .video = &saa7191_video_ops,
 597 };
 598
 599 static int saa7191_probe(struct i2c_client *client,
 600                           const struct i2c_device_id *id)
 601 {
 602         int err = 0;
 603         struct saa7191 *decoder;
 604         struct v4l2_subdev *sd;
 605
 606         v4l_info(client, "chip found @ 0x%x (%s)\n",
 607                         client->addr << 1, client->adapter->name);
 608
 609         decoder = kzalloc(sizeof(*decoder), GFP_KERNEL);
 610         if (!decoder)
 611                 return -ENOMEM;
 612
 613         sd = &decoder->sd;
 614         v4l2_i2c_subdev_init(sd, client, &saa7191_ops);
 615
 616         err = saa7191_write_block(sd, sizeof(initseq), initseq);
 617         if (err) {
 618                 printk(KERN_ERR "SAA7191 initialization failed\n");
 619                 kfree(decoder);
 620                 return err;
 621         }
 622
 623         printk(KERN_INFO "SAA7191 initialized\n");
 624
 625         decoder->input = SAA7191_INPUT_COMPOSITE;
 626         decoder->norm = V4L2_STD_PAL;
 627
 628         err = saa7191_autodetect_norm(sd);
 629         if (err && (err != -EBUSY))
 630                 printk(KERN_ERR "SAA7191: Signal auto-detection failed\n");
 631
 632         return 0;
 633 }
 634
 635 static int saa7191_remove(struct i2c_client *client)
 636 {
 637         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 638
 639         v4l2_device_unregister_subdev(sd);
 640         kfree(to_saa7191(sd));
 641         return 0;
 642 }
 643
 644 static const struct i2c_device_id saa7191_id[] = {
 645         { "saa7191", 0 },
 646         { }
 647 };
 648 MODULE_DEVICE_TABLE(i2c, saa7191_id);
 649
 650 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
 651         .name = "saa7191",
 652         .probe = saa7191_probe,
 653         .remove = saa7191_remove,
 654         .id_table = saa7191_id,
 655 };