drivers/media/video/saa7191.c

   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/sched.h>
  21 #include <linux/slab.h>
  22
  23 #include <linux/videodev.h>
  24 #include <linux/video_decoder.h>
  25 #include <linux/i2c.h>
  26
  27 #include "saa7191.h"
  28
  29 #define SAA7191_MODULE_VERSION "0.0.3"
  30
  31 MODULE_DESCRIPTION("Philips SAA7191 video decoder driver");
  32 MODULE_VERSION(SAA7191_MODULE_VERSION);
  33 MODULE_AUTHOR("Mikael Nousiainen <tmnousia@cc.hut.fi>");
  34 MODULE_LICENSE("GPL");
  35
  36 struct saa7191 {
  37         struct i2c_client *client;
  38
  39         /* the register values are stored here as the actual
  40          * I2C-registers are write-only */
  41         unsigned char reg[25];
  42
  43         unsigned char norm;
  44         unsigned char input;
  45 };
  46
  47 static struct i2c_driver i2c_driver_saa7191;
  48
  49 static const unsigned char initseq[] = {
  50         0,      /* Subaddress */
  51         0x50,   /* SAA7191_REG_IDEL */
  52         0x30,   /* SAA7191_REG_HSYB */
  53         0x00,   /* SAA7191_REG_HSYS */
  54         0xe8,   /* SAA7191_REG_HCLB */
  55         0xb6,   /* SAA7191_REG_HCLS */
  56         0xf4,   /* SAA7191_REG_HPHI */
  57         0x01,   /* SAA7191_REG_LUMA - chrominance trap active (CVBS) */
  58         0x00,   /* SAA7191_REG_HUEC */
  59         0xf8,   /* SAA7191_REG_CKTQ */
  60         0xf8,   /* SAA7191_REG_CKTS */
  61         0x90,   /* SAA7191_REG_PLSE */
  62         0x90,   /* SAA7191_REG_SESE */
  63         0x00,   /* SAA7191_REG_GAIN */
  64         0x0c,   /* SAA7191_REG_STDC - not SECAM, slow time constant */
  65         0x78,   /* SAA7191_REG_IOCK - chrominance from CVBS, GPSW1 & 2 off */
  66         0x99,   /* SAA7191_REG_CTL3 - automatic field detection */
  67         0x00,   /* SAA7191_REG_CTL4 */
  68         0x2c,   /* SAA7191_REG_CHCV */
  69         0x00,   /* unused */
  70         0x00,   /* unused */
  71         0x34,   /* SAA7191_REG_HS6B */
  72         0x0a,   /* SAA7191_REG_HS6S */
  73         0xf4,   /* SAA7191_REG_HC6B */
  74         0xce,   /* SAA7191_REG_HC6S */
  75         0xf4,   /* SAA7191_REG_HP6I */
  76 };
  77
  78 /* SAA7191 register handling */
  79
  80 static unsigned char saa7191_read_reg(struct i2c_client *client,
  81                                       unsigned char reg)
  82 {
  83         return ((struct saa7191 *)i2c_get_clientdata(client))->reg[reg];
  84 }
  85
  86 static int saa7191_read_status(struct i2c_client *client,
  87                                unsigned char *value)
  88 {
  89         int ret;
  90
  91         ret = i2c_master_recv(client, value, 1);
  92         if (ret < 0) {
  93                 printk(KERN_ERR "SAA7191: saa7191_read_status(): read failed");
  94                 return ret;
  95         }
  96
  97         return 0;
  98 }
  99
 100
 101 static int saa7191_write_reg(struct i2c_client *client, unsigned char reg,
 102                              unsigned char value)
 103 {
 104
 105         ((struct saa7191 *)i2c_get_clientdata(client))->reg[reg] = value;
 106         return i2c_smbus_write_byte_data(client, reg, value);
 107 }
 108
 109 /* the first byte of data must be the first subaddress number (register) */
 110 static int saa7191_write_block(struct i2c_client *client,
 111                                unsigned char length, unsigned char *data)
 112 {
 113         int i;
 114         int ret;
 115
 116         struct saa7191 *decoder = (struct saa7191 *)i2c_get_clientdata(client);
 117         for (i = 0; i < (length - 1); i++) {
 118                 decoder->reg[data[0] + i] = data[i + 1];
 119         }
 120
 121         ret = i2c_master_send(client, data, length);
 122         if (ret < 0) {
 123                 printk(KERN_ERR "SAA7191: saa7191_write_block(): "
 124                        "write failed");
 125                 return ret;
 126         }
 127
 128         return 0;
 129 }
 130
 131 /* Helper functions */
 132
 133 static int saa7191_set_input(struct i2c_client *client, int input)
 134 {
 135         unsigned char luma = saa7191_read_reg(client, SAA7191_REG_LUMA);
 136         unsigned char iock = saa7191_read_reg(client, SAA7191_REG_IOCK);
 137         int err;
 138
 139         switch (input) {
 140         case SAA7191_INPUT_COMPOSITE: /* Set Composite input */
 141                 iock &= ~(SAA7191_IOCK_CHRS | SAA7191_IOCK_GPSW1
 142                           | SAA7191_IOCK_GPSW2);
 143                 /* Chrominance trap active */
 144                 luma &= ~SAA7191_LUMA_BYPS;
 145                 break;
 146         case SAA7191_INPUT_SVIDEO: /* Set S-Video input */
 147                 iock |= SAA7191_IOCK_CHRS | SAA7191_IOCK_GPSW2;
 148                 /* Chrominance trap bypassed */
 149                 luma |= SAA7191_LUMA_BYPS;
 150                 break;
 151         default:
 152                 return -EINVAL;
 153         }
 154
 155         err = saa7191_write_reg(client, SAA7191_REG_LUMA, luma);
 156         if (err)
 157                 return -EIO;
 158         err = saa7191_write_reg(client, SAA7191_REG_IOCK, iock);
 159         if (err)
 160                 return -EIO;
 161
 162         return 0;
 163 }
 164
 165 static int saa7191_set_norm(struct i2c_client *client, int norm)
 166 {
 167         struct saa7191 *decoder = i2c_get_clientdata(client);
 168         unsigned char stdc = saa7191_read_reg(client, SAA7191_REG_STDC);
 169         unsigned char ctl3 = saa7191_read_reg(client, SAA7191_REG_CTL3);
 170         unsigned char chcv = saa7191_read_reg(client, SAA7191_REG_CHCV);
 171         int err;
 172
 173         switch(norm) {
 174         case SAA7191_NORM_AUTO: {
 175                 unsigned char status;
 176
 177                 // does status depend on current norm ?
 178                 if (saa7191_read_status(client, &status))
 179                         return -EIO;
 180
 181                 stdc &= ~SAA7191_STDC_SECS;
 182                 ctl3 &= ~SAA7191_CTL3_FSEL;
 183                 ctl3 |= SAA7191_CTL3_AUFD;
 184                 chcv = (status & SAA7191_STATUS_FIDT)
 185                                ? SAA7191_CHCV_NTSC : SAA7191_CHCV_PAL;
 186                 break;
 187         }
 188         case SAA7191_NORM_PAL:
 189                 stdc &= ~SAA7191_STDC_SECS;
 190                 ctl3 &= ~(SAA7191_CTL3_AUFD | SAA7191_CTL3_FSEL);
 191                 chcv = SAA7191_CHCV_PAL;
 192                 break;
 193         case SAA7191_NORM_NTSC:
 194                 stdc &= ~SAA7191_STDC_SECS;
 195                 ctl3 &= ~SAA7191_CTL3_AUFD;
 196                 ctl3 |= SAA7191_CTL3_FSEL;
 197                 chcv = SAA7191_CHCV_NTSC;
 198                 break;
 199         case SAA7191_NORM_SECAM:
 200                 stdc |= SAA7191_STDC_SECS;
 201                 ctl3 &= ~(SAA7191_CTL3_AUFD | SAA7191_CTL3_FSEL);
 202                 chcv = SAA7191_CHCV_PAL;
 203                 break;
 204         default:
 205                 return -EINVAL;
 206         }
 207
 208         err = saa7191_write_reg(client, SAA7191_REG_CTL3, ctl3);
 209         if (err)
 210                 return -EIO;
 211         err = saa7191_write_reg(client, SAA7191_REG_STDC, stdc);
 212         if (err)
 213                 return -EIO;
 214         err = saa7191_write_reg(client, SAA7191_REG_CHCV, chcv);
 215         if (err)
 216                 return -EIO;
 217
 218         decoder->norm = norm;
 219
 220         return 0;
 221 }
 222
 223 static int saa7191_get_controls(struct i2c_client *client,
 224                                 struct saa7191_control *ctrl)
 225 {
 226         unsigned char hue = saa7191_read_reg(client, SAA7191_REG_HUEC);
 227         unsigned char stdc = saa7191_read_reg(client, SAA7191_REG_STDC);
 228
 229         if (hue < 0x80) {
 230                 hue += 0x80;
 231         } else {
 232                 hue -= 0x80;
 233         }
 234         ctrl->hue = hue;
 235
 236         ctrl->vtrc = (stdc & SAA7191_STDC_VTRC)
 237                 ? SAA7191_VALUE_ENABLED : SAA7191_VALUE_DISABLED;
 238
 239         return 0;
 240 }
 241
 242 static int saa7191_set_controls(struct i2c_client *client,
 243                                 struct saa7191_control *ctrl)
 244 {
 245         int err;
 246
 247         if (ctrl->hue >= 0) {
 248                 unsigned char hue = ctrl->hue & 0xff;
 249                 if (hue < 0x80) {
 250                         hue += 0x80;
 251                 } else {
 252                         hue -= 0x80;
 253                 }
 254                 err = saa7191_write_reg(client, SAA7191_REG_HUEC, hue);
 255                 if (err)
 256                         return -EIO;
 257         }
 258         if (ctrl->vtrc >= 0) {
 259                 unsigned char stdc =
 260                         saa7191_read_reg(client, SAA7191_REG_STDC);
 261
 262                 if (ctrl->vtrc) {
 263                         stdc |= SAA7191_STDC_VTRC;
 264                 } else {
 265                         stdc &= ~SAA7191_STDC_VTRC;
 266                 }
 267
 268                 err = saa7191_write_reg(client, SAA7191_REG_STDC, stdc);
 269                 if (err)
 270                         return -EIO;
 271         }
 272
 273         return 0;
 274 }
 275
 276 /* I2C-interface */
 277
 278 static int saa7191_attach(struct i2c_adapter *adap, int addr, int kind)
 279 {
 280         int err = 0;
 281         struct saa7191 *decoder;
 282         struct i2c_client *client;
 283
 284         printk(KERN_INFO "Philips SAA7191 driver version %s\n",
 285                SAA7191_MODULE_VERSION);
 286
 287         client = kmalloc(sizeof(*client), GFP_KERNEL);
 288         if (!client)
 289                 return -ENOMEM;
 290         decoder = kmalloc(sizeof(*decoder), GFP_KERNEL);
 291         if (!decoder) {
 292                 err = -ENOMEM;
 293                 goto out_free_client;
 294         }
 295
 296         memset(client, 0, sizeof(struct i2c_client));
 297         memset(decoder, 0, sizeof(struct saa7191));
 298
 299         client->addr = addr;
 300         client->adapter = adap;
 301         client->driver = &i2c_driver_saa7191;
 302         client->flags = 0;
 303         strcpy(client->name, "saa7191 client");
 304         i2c_set_clientdata(client, decoder);
 305
 306         decoder->client = client;
 307
 308         err = i2c_attach_client(client);
 309         if (err)
 310                 goto out_free_decoder;
 311
 312         decoder->input = SAA7191_INPUT_COMPOSITE;
 313         decoder->norm = SAA7191_NORM_AUTO;
 314
 315         err = saa7191_write_block(client, sizeof(initseq),
 316                                   (unsigned char *)initseq);
 317         if (err) {
 318                 printk(KERN_ERR "SAA7191 initialization failed\n");
 319                 goto out_detach_client;
 320         }
 321
 322         printk(KERN_INFO "SAA7191 initialized\n");
 323
 324         return 0;
 325
 326 out_detach_client:
 327         i2c_detach_client(client);
 328 out_free_decoder:
 329         kfree(decoder);
 330 out_free_client:
 331         kfree(client);
 332         return err;
 333 }
 334
 335 static int saa7191_probe(struct i2c_adapter *adap)
 336 {
 337         /* Always connected to VINO */
 338         if (adap->id == I2C_HW_SGI_VINO)
 339                 return saa7191_attach(adap, SAA7191_ADDR, 0);
 340         /* Feel free to add probe here :-) */
 341         return -ENODEV;
 342 }
 343
 344 static int saa7191_detach(struct i2c_client *client)
 345 {
 346         struct saa7191 *decoder = i2c_get_clientdata(client);
 347
 348         i2c_detach_client(client);
 349         kfree(decoder);
 350         kfree(client);
 351         return 0;
 352 }
 353
 354 static int saa7191_command(struct i2c_client *client, unsigned int cmd,
 355                            void *arg)
 356 {
 357         struct saa7191 *decoder = i2c_get_clientdata(client);
 358
 359         switch (cmd) {
 360         case DECODER_GET_CAPABILITIES: {
 361                 struct video_decoder_capability *cap = arg;
 362
 363                 cap->flags  = VIDEO_DECODER_PAL | VIDEO_DECODER_NTSC |
 364                               VIDEO_DECODER_SECAM | VIDEO_DECODER_AUTO;
 365                 cap->inputs = (client->adapter->id == I2C_HW_SGI_VINO) ? 2 : 1;
 366                 cap->outputs = 1;
 367                 break;
 368         }
 369         case DECODER_GET_STATUS: {
 370                 int *iarg = arg;
 371                 unsigned char status;
 372                 int res = 0;
 373
 374                 if (saa7191_read_status(client, &status)) {
 375                         return -EIO;
 376                 }
 377                 if ((status & SAA7191_STATUS_HLCK) == 0)
 378                         res |= DECODER_STATUS_GOOD;
 379                 if (status & SAA7191_STATUS_CODE)
 380                         res |= DECODER_STATUS_COLOR;
 381                 switch (decoder->norm) {
 382                 case SAA7191_NORM_NTSC:
 383                         res |= DECODER_STATUS_NTSC;
 384                         break;
 385                 case SAA7191_NORM_PAL:
 386                         res |= DECODER_STATUS_PAL;
 387                         break;
 388                 case SAA7191_NORM_SECAM:
 389                         res |= DECODER_STATUS_SECAM;
 390                         break;
 391                 case SAA7191_NORM_AUTO:
 392                 default:
 393                         if (status & SAA7191_STATUS_FIDT)
 394                                 res |= DECODER_STATUS_NTSC;
 395                         else
 396                                 res |= DECODER_STATUS_PAL;
 397                         break;
 398                 }
 399                 *iarg = res;
 400                 break;
 401         }
 402         case DECODER_SET_NORM: {
 403                 int *iarg = arg;
 404
 405                 switch (*iarg) {
 406                 case VIDEO_MODE_AUTO:
 407                         return saa7191_set_norm(client, SAA7191_NORM_AUTO);
 408                 case VIDEO_MODE_PAL:
 409                         return saa7191_set_norm(client, SAA7191_NORM_PAL);
 410                 case VIDEO_MODE_NTSC:
 411                         return saa7191_set_norm(client, SAA7191_NORM_NTSC);
 412                 case VIDEO_MODE_SECAM:
 413                         return saa7191_set_norm(client, SAA7191_NORM_SECAM);
 414                 default:
 415                         return -EINVAL;
 416                 }
 417                 break;
 418         }
 419         case DECODER_SET_INPUT: {
 420                 int *iarg = arg;
 421
 422                 switch (client->adapter->id) {
 423                 case I2C_HW_SGI_VINO:
 424                         return saa7191_set_input(client, *iarg);
 425                 default:
 426                         if (*iarg != 0)
 427                                 return -EINVAL;
 428                 }
 429                 break;
 430         }
 431         case DECODER_SET_OUTPUT: {
 432                 int *iarg = arg;
 433
 434                 /* not much choice of outputs */
 435                 if (*iarg != 0)
 436                         return -EINVAL;
 437                 break;
 438         }
 439         case DECODER_ENABLE_OUTPUT: {
 440                 /* Always enabled */
 441                 break;
 442         }
 443         case DECODER_SET_PICTURE: {
 444                 struct video_picture *pic = arg;
 445                 unsigned val;
 446                 int err;
 447
 448                 val = (pic->hue >> 8) - 0x80;
 449                 err = saa7191_write_reg(client, SAA7191_REG_HUEC, val);
 450                 if (err)
 451                         return -EIO;
 452                 break;
 453         }
 454         case DECODER_SAA7191_GET_STATUS: {
 455                 struct saa7191_status *status = arg;
 456                 unsigned char status_reg;
 457
 458                 if (saa7191_read_status(client, &status_reg))
 459                         return -EIO;
 460                 status->signal = ((status_reg & SAA7191_STATUS_HLCK) == 0)
 461                         ? SAA7191_VALUE_ENABLED : SAA7191_VALUE_DISABLED;
 462                 status->ntsc = (status_reg & SAA7191_STATUS_FIDT)
 463                         ? SAA7191_VALUE_ENABLED : SAA7191_VALUE_DISABLED;
 464                 status->color = (status_reg & SAA7191_STATUS_CODE)
 465                         ? SAA7191_VALUE_ENABLED : SAA7191_VALUE_DISABLED;
 466
 467                 status->input = decoder->input;
 468                 status->norm = decoder->norm;
 469         }
 470         case DECODER_SAA7191_SET_NORM: {
 471                 int *norm = arg;
 472                 return saa7191_set_norm(client, *norm);
 473         }
 474         case DECODER_SAA7191_GET_CONTROLS: {
 475                 struct saa7191_control *ctrl = arg;
 476                 return saa7191_get_controls(client, ctrl);
 477         }
 478         case DECODER_SAA7191_SET_CONTROLS: {
 479                 struct saa7191_control *ctrl = arg;
 480                 return saa7191_set_controls(client, ctrl);
 481         }
 482         default:
 483                 return -EINVAL;
 484         }
 485
 486         return 0;
 487 }
 488
 489 static struct i2c_driver i2c_driver_saa7191 = {
 490         .owner          = THIS_MODULE,
 491         .name           = "saa7191",
 492         .id             = I2C_DRIVERID_SAA7191,
 493         .flags          = I2C_DF_NOTIFY,
 494         .attach_adapter = saa7191_probe,
 495         .detach_client  = saa7191_detach,
 496         .command        = saa7191_command
 497 };
 498
 499 static int saa7191_init(void)
 500 {
 501         return i2c_add_driver(&i2c_driver_saa7191);
 502 }
 503
 504 static void saa7191_exit(void)
 505 {
 506         i2c_del_driver(&i2c_driver_saa7191);
 507 }
 508
 509 module_init(saa7191_init);
 510 module_exit(saa7191_exit);