drivers/media/i2c/bt819.c

   1 /*
   2  *  bt819 - BT819A VideoStream Decoder (Rockwell Part)
   3  *
   4  * Copyright (C) 1999 Mike Bernson <mike@mlb.org>
   5  * Copyright (C) 1998 Dave Perks <dperks@ibm.net>
   6  *
   7  * Modifications for LML33/DC10plus unified driver
   8  * Copyright (C) 2000 Serguei Miridonov <mirsev@cicese.mx>
   9  *
  10  * Changes by Ronald Bultje <rbultje@ronald.bitfreak.net>
  11  *    - moved over to linux>=2.4.x i2c protocol (9/9/2002)
  12  *
  13  * This code was modify/ported from the saa7111 driver written
  14  * by Dave Perks.
  15  *
  16  * This program is free software; you can redistribute it and/or modify
  17  * it under the terms of the GNU General Public License as published by
  18  * the Free Software Foundation; either version 2 of the License, or
  19  * (at your option) any later version.
  20  *
  21  * This program is distributed in the hope that it will be useful,
  22  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24  * GNU General Public License for more details.
  25  *
  26  * You should have received a copy of the GNU General Public License
  27  * along with this program; if not, write to the Free Software
  28  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  29  */
  30
  31 #include <linux/module.h>
  32 #include <linux/types.h>
  33 #include <linux/ioctl.h>
  34 #include <linux/delay.h>
  35 #include <linux/i2c.h>
  36 #include <linux/videodev2.h>
  37 #include <linux/slab.h>
  38 #include <media/v4l2-device.h>
  39 #include <media/v4l2-ctrls.h>
  40 #include <media/i2c/bt819.h>
  41
  42 MODULE_DESCRIPTION("Brooktree-819 video decoder driver");
  43 MODULE_AUTHOR("Mike Bernson & Dave Perks");
  44 MODULE_LICENSE("GPL");
  45
  46 static int debug;
  47 module_param(debug, int, 0);
  48 MODULE_PARM_DESC(debug, "Debug level (0-1)");
  49
  50
  51 /* ----------------------------------------------------------------------- */
  52
  53 struct bt819 {
  54         struct v4l2_subdev sd;
  55         struct v4l2_ctrl_handler hdl;
  56         unsigned char reg[32];
  57
  58         v4l2_std_id norm;
  59         int input;
  60         int enable;
  61 };
  62
  63 static inline struct bt819 *to_bt819(struct v4l2_subdev *sd)
  64 {
  65         return container_of(sd, struct bt819, sd);
  66 }
  67
  68 static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl)
  69 {
  70         return &container_of(ctrl->handler, struct bt819, hdl)->sd;
  71 }
  72
  73 struct timing {
  74         int hactive;
  75         int hdelay;
  76         int vactive;
  77         int vdelay;
  78         int hscale;
  79         int vscale;
  80 };
  81
  82 /* for values, see the bt819 datasheet */
  83 static struct timing timing_data[] = {
  84         {864 - 24, 20, 625 - 2, 1, 0x0504, 0x0000},
  85         {858 - 24, 20, 525 - 2, 1, 0x00f8, 0x0000},
  86 };
  87
  88 /* ----------------------------------------------------------------------- */
  89
  90 static inline int bt819_write(struct bt819 *decoder, u8 reg, u8 value)
  91 {
  92         struct i2c_client *client = v4l2_get_subdevdata(&decoder->sd);
  93
  94         decoder->reg[reg] = value;
  95         return i2c_smbus_write_byte_data(client, reg, value);
  96 }
  97
  98 static inline int bt819_setbit(struct bt819 *decoder, u8 reg, u8 bit, u8 value)
  99 {
 100         return bt819_write(decoder, reg,
 101                 (decoder->reg[reg] & ~(1 << bit)) | (value ? (1 << bit) : 0));
 102 }
 103
 104 static int bt819_write_block(struct bt819 *decoder, const u8 *data, unsigned int len)
 105 {
 106         struct i2c_client *client = v4l2_get_subdevdata(&decoder->sd);
 107         int ret = -1;
 108         u8 reg;
 109
 110         /* the bt819 has an autoincrement function, use it if
 111          * the adapter understands raw I2C */
 112         if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
 113                 /* do raw I2C, not smbus compatible */
 114                 u8 block_data[32];
 115                 int block_len;
 116
 117                 while (len >= 2) {
 118                         block_len = 0;
 119                         block_data[block_len++] = reg = data[0];
 120                         do {
 121                                 block_data[block_len++] =
 122                                     decoder->reg[reg++] = data[1];
 123                                 len -= 2;
 124                                 data += 2;
 125                         } while (len >= 2 && data[0] == reg && block_len < 32);
 126                         ret = i2c_master_send(client, block_data, block_len);
 127                         if (ret < 0)
 128                                 break;
 129                 }
 130         } else {
 131                 /* do some slow I2C emulation kind of thing */
 132                 while (len >= 2) {
 133                         reg = *data++;
 134                         ret = bt819_write(decoder, reg, *data++);
 135                         if (ret < 0)
 136                                 break;
 137                         len -= 2;
 138                 }
 139         }
 140
 141         return ret;
 142 }
 143
 144 static inline int bt819_read(struct bt819 *decoder, u8 reg)
 145 {
 146         struct i2c_client *client = v4l2_get_subdevdata(&decoder->sd);
 147
 148         return i2c_smbus_read_byte_data(client, reg);
 149 }
 150
 151 static int bt819_init(struct v4l2_subdev *sd)
 152 {
 153         static unsigned char init[] = {
 154                 /*0x1f, 0x00,*/     /* Reset */
 155                 0x01, 0x59,     /* 0x01 input format */
 156                 0x02, 0x00,     /* 0x02 temporal decimation */
 157                 0x03, 0x12,     /* 0x03 Cropping msb */
 158                 0x04, 0x16,     /* 0x04 Vertical Delay, lsb */
 159                 0x05, 0xe0,     /* 0x05 Vertical Active lsb */
 160                 0x06, 0x80,     /* 0x06 Horizontal Delay lsb */
 161                 0x07, 0xd0,     /* 0x07 Horizontal Active lsb */
 162                 0x08, 0x00,     /* 0x08 Horizontal Scaling msb */
 163                 0x09, 0xf8,     /* 0x09 Horizontal Scaling lsb */
 164                 0x0a, 0x00,     /* 0x0a Brightness control */
 165                 0x0b, 0x30,     /* 0x0b Miscellaneous control */
 166                 0x0c, 0xd8,     /* 0x0c Luma Gain lsb */
 167                 0x0d, 0xfe,     /* 0x0d Chroma Gain (U) lsb */
 168                 0x0e, 0xb4,     /* 0x0e Chroma Gain (V) msb */
 169                 0x0f, 0x00,     /* 0x0f Hue control */
 170                 0x12, 0x04,     /* 0x12 Output Format */
 171                 0x13, 0x20,     /* 0x13 Vertial Scaling msb 0x00
 172                                            chroma comb OFF, line drop scaling, interlace scaling
 173                                            BUG? Why does turning the chroma comb on fuck up color?
 174                                            Bug in the bt819 stepping on my board?
 175                                         */
 176                 0x14, 0x00,     /* 0x14 Vertial Scaling lsb */
 177                 0x16, 0x07,     /* 0x16 Video Timing Polarity
 178                                            ACTIVE=active low
 179                                            FIELD: high=odd,
 180                                            vreset=active high,
 181                                            hreset=active high */
 182                 0x18, 0x68,     /* 0x18 AGC Delay */
 183                 0x19, 0x5d,     /* 0x19 Burst Gate Delay */
 184                 0x1a, 0x80,     /* 0x1a ADC Interface */
 185         };
 186
 187         struct bt819 *decoder = to_bt819(sd);
 188         struct timing *timing = &timing_data[(decoder->norm & V4L2_STD_525_60) ? 1 : 0];
 189
 190         init[0x03 * 2 - 1] =
 191             (((timing->vdelay >> 8) & 0x03) << 6) |
 192             (((timing->vactive >> 8) & 0x03) << 4) |
 193             (((timing->hdelay >> 8) & 0x03) << 2) |
 194             ((timing->hactive >> 8) & 0x03);
 195         init[0x04 * 2 - 1] = timing->vdelay & 0xff;
 196         init[0x05 * 2 - 1] = timing->vactive & 0xff;
 197         init[0x06 * 2 - 1] = timing->hdelay & 0xff;
 198         init[0x07 * 2 - 1] = timing->hactive & 0xff;
 199         init[0x08 * 2 - 1] = timing->hscale >> 8;
 200         init[0x09 * 2 - 1] = timing->hscale & 0xff;
 201         /* 0x15 in array is address 0x19 */
 202         init[0x15 * 2 - 1] = (decoder->norm & V4L2_STD_625_50) ? 115 : 93;      /* Chroma burst delay */
 203         /* reset */
 204         bt819_write(decoder, 0x1f, 0x00);
 205         mdelay(1);
 206
 207         /* init */
 208         return bt819_write_block(decoder, init, sizeof(init));
 209 }
 210
 211 /* ----------------------------------------------------------------------- */
 212
 213 static int bt819_status(struct v4l2_subdev *sd, u32 *pstatus, v4l2_std_id *pstd)
 214 {
 215         struct bt819 *decoder = to_bt819(sd);
 216         int status = bt819_read(decoder, 0x00);
 217         int res = V4L2_IN_ST_NO_SIGNAL;
 218         v4l2_std_id std = pstd ? *pstd : V4L2_STD_ALL;
 219
 220         if ((status & 0x80))
 221                 res = 0;
 222         else
 223                 std = V4L2_STD_UNKNOWN;
 224
 225         if ((status & 0x10))
 226                 std &= V4L2_STD_PAL;
 227         else
 228                 std &= V4L2_STD_NTSC;
 229         if (pstd)
 230                 *pstd = std;
 231         if (pstatus)
 232                 *pstatus = res;
 233
 234         v4l2_dbg(1, debug, sd, "get status %x\n", status);
 235         return 0;
 236 }
 237
 238 static int bt819_querystd(struct v4l2_subdev *sd, v4l2_std_id *std)
 239 {
 240         return bt819_status(sd, NULL, std);
 241 }
 242
 243 static int bt819_g_input_status(struct v4l2_subdev *sd, u32 *status)
 244 {
 245         return bt819_status(sd, status, NULL);
 246 }
 247
 248 static int bt819_s_std(struct v4l2_subdev *sd, v4l2_std_id std)
 249 {
 250         struct bt819 *decoder = to_bt819(sd);
 251         struct timing *timing = NULL;
 252
 253         v4l2_dbg(1, debug, sd, "set norm %llx\n", (unsigned long long)std);
 254
 255         if (sd->v4l2_dev == NULL || sd->v4l2_dev->notify == NULL)
 256                 v4l2_err(sd, "no notify found!\n");
 257
 258         if (std & V4L2_STD_NTSC) {
 259                 v4l2_subdev_notify(sd, BT819_FIFO_RESET_LOW, NULL);
 260                 bt819_setbit(decoder, 0x01, 0, 1);
 261                 bt819_setbit(decoder, 0x01, 1, 0);
 262                 bt819_setbit(decoder, 0x01, 5, 0);
 263                 bt819_write(decoder, 0x18, 0x68);
 264                 bt819_write(decoder, 0x19, 0x5d);
 265                 /* bt819_setbit(decoder, 0x1a,  5, 1); */
 266                 timing = &timing_data[1];
 267         } else if (std & V4L2_STD_PAL) {
 268                 v4l2_subdev_notify(sd, BT819_FIFO_RESET_LOW, NULL);
 269                 bt819_setbit(decoder, 0x01, 0, 1);
 270                 bt819_setbit(decoder, 0x01, 1, 1);
 271                 bt819_setbit(decoder, 0x01, 5, 1);
 272                 bt819_write(decoder, 0x18, 0x7f);
 273                 bt819_write(decoder, 0x19, 0x72);
 274                 /* bt819_setbit(decoder, 0x1a,  5, 0); */
 275                 timing = &timing_data[0];
 276         } else {
 277                 v4l2_dbg(1, debug, sd, "unsupported norm %llx\n",
 278                                 (unsigned long long)std);
 279                 return -EINVAL;
 280         }
 281         bt819_write(decoder, 0x03,
 282                         (((timing->vdelay >> 8) & 0x03) << 6) |
 283                         (((timing->vactive >> 8) & 0x03) << 4) |
 284                         (((timing->hdelay >> 8) & 0x03) << 2) |
 285                         ((timing->hactive >> 8) & 0x03));
 286         bt819_write(decoder, 0x04, timing->vdelay & 0xff);
 287         bt819_write(decoder, 0x05, timing->vactive & 0xff);
 288         bt819_write(decoder, 0x06, timing->hdelay & 0xff);
 289         bt819_write(decoder, 0x07, timing->hactive & 0xff);
 290         bt819_write(decoder, 0x08, (timing->hscale >> 8) & 0xff);
 291         bt819_write(decoder, 0x09, timing->hscale & 0xff);
 292         decoder->norm = std;
 293         v4l2_subdev_notify(sd, BT819_FIFO_RESET_HIGH, NULL);
 294         return 0;
 295 }
 296
 297 static int bt819_s_routing(struct v4l2_subdev *sd,
 298                            u32 input, u32 output, u32 config)
 299 {
 300         struct bt819 *decoder = to_bt819(sd);
 301
 302         v4l2_dbg(1, debug, sd, "set input %x\n", input);
 303
 304         if (input > 7)
 305                 return -EINVAL;
 306
 307         if (sd->v4l2_dev == NULL || sd->v4l2_dev->notify == NULL)
 308                 v4l2_err(sd, "no notify found!\n");
 309
 310         if (decoder->input != input) {
 311                 v4l2_subdev_notify(sd, BT819_FIFO_RESET_LOW, NULL);
 312                 decoder->input = input;
 313                 /* select mode */
 314                 if (decoder->input == 0) {
 315                         bt819_setbit(decoder, 0x0b, 6, 0);
 316                         bt819_setbit(decoder, 0x1a, 1, 1);
 317                 } else {
 318                         bt819_setbit(decoder, 0x0b, 6, 1);
 319                         bt819_setbit(decoder, 0x1a, 1, 0);
 320                 }
 321                 v4l2_subdev_notify(sd, BT819_FIFO_RESET_HIGH, NULL);
 322         }
 323         return 0;
 324 }
 325
 326 static int bt819_s_stream(struct v4l2_subdev *sd, int enable)
 327 {
 328         struct bt819 *decoder = to_bt819(sd);
 329
 330         v4l2_dbg(1, debug, sd, "enable output %x\n", enable);
 331
 332         if (decoder->enable != enable) {
 333                 decoder->enable = enable;
 334                 bt819_setbit(decoder, 0x16, 7, !enable);
 335         }
 336         return 0;
 337 }
 338
 339 static int bt819_s_ctrl(struct v4l2_ctrl *ctrl)
 340 {
 341         struct v4l2_subdev *sd = to_sd(ctrl);
 342         struct bt819 *decoder = to_bt819(sd);
 343         int temp;
 344
 345         switch (ctrl->id) {
 346         case V4L2_CID_BRIGHTNESS:
 347                 bt819_write(decoder, 0x0a, ctrl->val);
 348                 break;
 349
 350         case V4L2_CID_CONTRAST:
 351                 bt819_write(decoder, 0x0c, ctrl->val & 0xff);
 352                 bt819_setbit(decoder, 0x0b, 2, ((ctrl->val >> 8) & 0x01));
 353                 break;
 354
 355         case V4L2_CID_SATURATION:
 356                 bt819_write(decoder, 0x0d, (ctrl->val >> 7) & 0xff);
 357                 bt819_setbit(decoder, 0x0b, 1, ((ctrl->val >> 15) & 0x01));
 358
 359                 /* Ratio between U gain and V gain must stay the same as
 360                    the ratio between the default U and V gain values. */
 361                 temp = (ctrl->val * 180) / 254;
 362                 bt819_write(decoder, 0x0e, (temp >> 7) & 0xff);
 363                 bt819_setbit(decoder, 0x0b, 0, (temp >> 15) & 0x01);
 364                 break;
 365
 366         case V4L2_CID_HUE:
 367                 bt819_write(decoder, 0x0f, ctrl->val);
 368                 break;
 369
 370         default:
 371                 return -EINVAL;
 372         }
 373         return 0;
 374 }
 375
 376 /* ----------------------------------------------------------------------- */
 377
 378 static const struct v4l2_ctrl_ops bt819_ctrl_ops = {
 379         .s_ctrl = bt819_s_ctrl,
 380 };
 381
 382 static const struct v4l2_subdev_video_ops bt819_video_ops = {
 383         .s_std = bt819_s_std,
 384         .s_routing = bt819_s_routing,
 385         .s_stream = bt819_s_stream,
 386         .querystd = bt819_querystd,
 387         .g_input_status = bt819_g_input_status,
 388 };
 389
 390 static const struct v4l2_subdev_ops bt819_ops = {
 391         .video = &bt819_video_ops,
 392 };
 393
 394 /* ----------------------------------------------------------------------- */
 395
 396 static int bt819_probe(struct i2c_client *client,
 397                         const struct i2c_device_id *id)
 398 {
 399         int i, ver;
 400         struct bt819 *decoder;
 401         struct v4l2_subdev *sd;
 402         const char *name;
 403
 404         /* Check if the adapter supports the needed features */
 405         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 406                 return -ENODEV;
 407
 408         decoder = devm_kzalloc(&client->dev, sizeof(*decoder), GFP_KERNEL);
 409         if (decoder == NULL)
 410                 return -ENOMEM;
 411         sd = &decoder->sd;
 412         v4l2_i2c_subdev_init(sd, client, &bt819_ops);
 413
 414         ver = bt819_read(decoder, 0x17);
 415         switch (ver & 0xf0) {
 416         case 0x70:
 417                 name = "bt819a";
 418                 break;
 419         case 0x60:
 420                 name = "bt817a";
 421                 break;
 422         case 0x20:
 423                 name = "bt815a";
 424                 break;
 425         default:
 426                 v4l2_dbg(1, debug, sd,
 427                         "unknown chip version 0x%02x\n", ver);
 428                 return -ENODEV;
 429         }
 430
 431         v4l_info(client, "%s found @ 0x%x (%s)\n", name,
 432                         client->addr << 1, client->adapter->name);
 433
 434         decoder->norm = V4L2_STD_NTSC;
 435         decoder->input = 0;
 436         decoder->enable = 1;
 437
 438         i = bt819_init(sd);
 439         if (i < 0)
 440                 v4l2_dbg(1, debug, sd, "init status %d\n", i);
 441
 442         v4l2_ctrl_handler_init(&decoder->hdl, 4);
 443         v4l2_ctrl_new_std(&decoder->hdl, &bt819_ctrl_ops,
 444                         V4L2_CID_BRIGHTNESS, -128, 127, 1, 0);
 445         v4l2_ctrl_new_std(&decoder->hdl, &bt819_ctrl_ops,
 446                         V4L2_CID_CONTRAST, 0, 511, 1, 0xd8);
 447         v4l2_ctrl_new_std(&decoder->hdl, &bt819_ctrl_ops,
 448                         V4L2_CID_SATURATION, 0, 511, 1, 0xfe);
 449         v4l2_ctrl_new_std(&decoder->hdl, &bt819_ctrl_ops,
 450                         V4L2_CID_HUE, -128, 127, 1, 0);
 451         sd->ctrl_handler = &decoder->hdl;
 452         if (decoder->hdl.error) {
 453                 int err = decoder->hdl.error;
 454
 455                 v4l2_ctrl_handler_free(&decoder->hdl);
 456                 return err;
 457         }
 458         v4l2_ctrl_handler_setup(&decoder->hdl);
 459         return 0;
 460 }
 461
 462 static int bt819_remove(struct i2c_client *client)
 463 {
 464         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 465         struct bt819 *decoder = to_bt819(sd);
 466
 467         v4l2_device_unregister_subdev(sd);
 468         v4l2_ctrl_handler_free(&decoder->hdl);
 469         return 0;
 470 }
 471
 472 /* ----------------------------------------------------------------------- */
 473
 474 static const struct i2c_device_id bt819_id[] = {
 475         { "bt819a", 0 },
 476         { "bt817a", 0 },
 477         { "bt815a", 0 },
 478         { }
 479 };
 480 MODULE_DEVICE_TABLE(i2c, bt819_id);
 481
 482 static struct i2c_driver bt819_driver = {
 483         .driver = {
 484                 .name   = "bt819",
 485         },
 486         .probe          = bt819_probe,
 487         .remove         = bt819_remove,
 488         .id_table       = bt819_id,
 489 };
 490
 491 module_i2c_driver(bt819_driver);