drivers/media/video/gspca/m5602/m5602_ov7660.c

   1 /*
   2  * Driver for the ov7660 sensor
   3  *
   4  * Copyright (C) 2009 Erik Andrén
   5  * Copyright (C) 2007 Ilyes Gouta. Based on the m5603x Linux Driver Project.
   6  * Copyright (C) 2005 m5603x Linux Driver Project <m5602@x3ng.com.br>
   7  *
   8  * Portions of code to USB interface and ALi driver software,
   9  * Copyright (c) 2006 Willem Duinker
  10  * v4l2 interface modeled after the V4L2 driver
  11  * for SN9C10x PC Camera Controllers
  12  *
  13  * This program is free software; you can redistribute it and/or
  14  * modify it under the terms of the GNU General Public License as
  15  * published by the Free Software Foundation, version 2.
  16  *
  17  */
  18
  19 #include "m5602_ov7660.h"
  20
  21 static int ov7660_get_gain(struct gspca_dev *gspca_dev, __s32 *val);
  22 static int ov7660_set_gain(struct gspca_dev *gspca_dev, __s32 val);
  23 static int ov7660_get_auto_white_balance(struct gspca_dev *gspca_dev,
  24                                          __s32 *val);
  25 static int ov7660_set_auto_white_balance(struct gspca_dev *gspca_dev,
  26                                          __s32 val);
  27 static int ov7660_get_auto_gain(struct gspca_dev *gspca_dev, __s32 *val);
  28 static int ov7660_set_auto_gain(struct gspca_dev *gspca_dev, __s32 val);
  29 static int ov7660_get_auto_exposure(struct gspca_dev *gspca_dev, __s32 *val);
  30 static int ov7660_set_auto_exposure(struct gspca_dev *gspca_dev, __s32 val);
  31 static int ov7660_get_hflip(struct gspca_dev *gspca_dev, __s32 *val);
  32 static int ov7660_set_hflip(struct gspca_dev *gspca_dev, __s32 val);
  33 static int ov7660_get_vflip(struct gspca_dev *gspca_dev, __s32 *val);
  34 static int ov7660_set_vflip(struct gspca_dev *gspca_dev, __s32 val);
  35
  36 static const struct ctrl ov7660_ctrls[] = {
  37 #define GAIN_IDX 1
  38         {
  39                 {
  40                         .id             = V4L2_CID_GAIN,
  41                         .type           = V4L2_CTRL_TYPE_INTEGER,
  42                         .name           = "gain",
  43                         .minimum        = 0x00,
  44                         .maximum        = 0xff,
  45                         .step           = 0x1,
  46                         .default_value  = OV7660_DEFAULT_GAIN,
  47                         .flags          = V4L2_CTRL_FLAG_SLIDER
  48                 },
  49                 .set = ov7660_set_gain,
  50                 .get = ov7660_get_gain
  51         },
  52 #define BLUE_BALANCE_IDX 2
  53 #define RED_BALANCE_IDX 3
  54 #define AUTO_WHITE_BALANCE_IDX 4
  55         {
  56                 {
  57                         .id             = V4L2_CID_AUTO_WHITE_BALANCE,
  58                         .type           = V4L2_CTRL_TYPE_BOOLEAN,
  59                         .name           = "auto white balance",
  60                         .minimum        = 0,
  61                         .maximum        = 1,
  62                         .step           = 1,
  63                         .default_value  = 1
  64                 },
  65                 .set = ov7660_set_auto_white_balance,
  66                 .get = ov7660_get_auto_white_balance
  67         },
  68 #define AUTO_GAIN_CTRL_IDX 5
  69         {
  70                 {
  71                         .id             = V4L2_CID_AUTOGAIN,
  72                         .type           = V4L2_CTRL_TYPE_BOOLEAN,
  73                         .name           = "auto gain control",
  74                         .minimum        = 0,
  75                         .maximum        = 1,
  76                         .step           = 1,
  77                         .default_value  = 1
  78                 },
  79                 .set = ov7660_set_auto_gain,
  80                 .get = ov7660_get_auto_gain
  81         },
  82 #define AUTO_EXPOSURE_IDX 6
  83         {
  84                 {
  85                         .id             = V4L2_CID_EXPOSURE_AUTO,
  86                         .type           = V4L2_CTRL_TYPE_BOOLEAN,
  87                         .name           = "auto exposure",
  88                         .minimum        = 0,
  89                         .maximum        = 1,
  90                         .step           = 1,
  91                         .default_value  = 1
  92                 },
  93                 .set = ov7660_set_auto_exposure,
  94                 .get = ov7660_get_auto_exposure
  95         },
  96 #define HFLIP_IDX 7
  97         {
  98                 {
  99                         .id             = V4L2_CID_HFLIP,
 100                         .type           = V4L2_CTRL_TYPE_BOOLEAN,
 101                         .name           = "horizontal flip",
 102                         .minimum        = 0,
 103                         .maximum        = 1,
 104                         .step           = 1,
 105                         .default_value  = 0
 106                 },
 107                 .set = ov7660_set_hflip,
 108                 .get = ov7660_get_hflip
 109         },
 110 #define VFLIP_IDX 8
 111         {
 112                 {
 113                         .id             = V4L2_CID_VFLIP,
 114                         .type           = V4L2_CTRL_TYPE_BOOLEAN,
 115                         .name           = "vertical flip",
 116                         .minimum        = 0,
 117                         .maximum        = 1,
 118                         .step           = 1,
 119                         .default_value  = 0
 120                 },
 121                 .set = ov7660_set_vflip,
 122                 .get = ov7660_get_vflip
 123         },
 124
 125 };
 126
 127 static struct v4l2_pix_format ov7660_modes[] = {
 128         {
 129                 640,
 130                 480,
 131                 V4L2_PIX_FMT_SBGGR8,
 132                 V4L2_FIELD_NONE,
 133                 .sizeimage =
 134                         640 * 480,
 135                 .bytesperline = 640,
 136                 .colorspace = V4L2_COLORSPACE_SRGB,
 137                 .priv = 0
 138         }
 139 };
 140
 141 static void ov7660_dump_registers(struct sd *sd);
 142
 143 int ov7660_probe(struct sd *sd)
 144 {
 145         int err = 0, i;
 146         u8 prod_id = 0, ver_id = 0;
 147
 148         s32 *sensor_settings;
 149
 150         if (force_sensor) {
 151                 if (force_sensor == OV7660_SENSOR) {
 152                         info("Forcing an %s sensor", ov7660.name);
 153                         goto sensor_found;
 154                 }
 155                 /* If we want to force another sensor,
 156                 don't try to probe this one */
 157                 return -ENODEV;
 158         }
 159
 160         /* Do the preinit */
 161         for (i = 0; i < ARRAY_SIZE(preinit_ov7660) && !err; i++) {
 162                 u8 data[2];
 163
 164                 if (preinit_ov7660[i][0] == BRIDGE) {
 165                         err = m5602_write_bridge(sd,
 166                                 preinit_ov7660[i][1],
 167                                 preinit_ov7660[i][2]);
 168                 } else {
 169                         data[0] = preinit_ov7660[i][2];
 170                         err = m5602_write_sensor(sd,
 171                                 preinit_ov7660[i][1], data, 1);
 172                 }
 173         }
 174         if (err < 0)
 175                 return err;
 176
 177         if (m5602_read_sensor(sd, OV7660_PID, &prod_id, 1))
 178                 return -ENODEV;
 179
 180         if (m5602_read_sensor(sd, OV7660_VER, &ver_id, 1))
 181                 return -ENODEV;
 182
 183         info("Sensor reported 0x%x%x", prod_id, ver_id);
 184
 185         if ((prod_id == 0x76) && (ver_id == 0x60)) {
 186                 info("Detected a ov7660 sensor");
 187                 goto sensor_found;
 188         }
 189         return -ENODEV;
 190
 191 sensor_found:
 192         sensor_settings = kmalloc(
 193                 ARRAY_SIZE(ov7660_ctrls) * sizeof(s32), GFP_KERNEL);
 194         if (!sensor_settings)
 195                 return -ENOMEM;
 196
 197         sd->gspca_dev.cam.cam_mode = ov7660_modes;
 198         sd->gspca_dev.cam.nmodes = ARRAY_SIZE(ov7660_modes);
 199         sd->desc->ctrls = ov7660_ctrls;
 200         sd->desc->nctrls = ARRAY_SIZE(ov7660_ctrls);
 201
 202         for (i = 0; i < ARRAY_SIZE(ov7660_ctrls); i++)
 203                 sensor_settings[i] = ov7660_ctrls[i].qctrl.default_value;
 204         sd->sensor_priv = sensor_settings;
 205
 206         return 0;
 207 }
 208
 209 int ov7660_init(struct sd *sd)
 210 {
 211         int i, err = 0;
 212         s32 *sensor_settings = sd->sensor_priv;
 213
 214         /* Init the sensor */
 215         for (i = 0; i < ARRAY_SIZE(init_ov7660); i++) {
 216                 u8 data[2];
 217
 218                 if (init_ov7660[i][0] == BRIDGE) {
 219                         err = m5602_write_bridge(sd,
 220                                 init_ov7660[i][1],
 221                                 init_ov7660[i][2]);
 222                 } else {
 223                         data[0] = init_ov7660[i][2];
 224                         err = m5602_write_sensor(sd,
 225                                 init_ov7660[i][1], data, 1);
 226                 }
 227         }
 228
 229         if (dump_sensor)
 230                 ov7660_dump_registers(sd);
 231
 232         err = ov7660_set_gain(&sd->gspca_dev, sensor_settings[GAIN_IDX]);
 233         if (err < 0)
 234                 return err;
 235
 236         err = ov7660_set_auto_white_balance(&sd->gspca_dev,
 237                 sensor_settings[AUTO_WHITE_BALANCE_IDX]);
 238         if (err < 0)
 239                 return err;
 240
 241         err = ov7660_set_auto_gain(&sd->gspca_dev,
 242                 sensor_settings[AUTO_GAIN_CTRL_IDX]);
 243         if (err < 0)
 244                 return err;
 245
 246         err = ov7660_set_auto_exposure(&sd->gspca_dev,
 247                 sensor_settings[AUTO_EXPOSURE_IDX]);
 248         if (err < 0)
 249                 return err;
 250         err = ov7660_set_hflip(&sd->gspca_dev,
 251                 sensor_settings[HFLIP_IDX]);
 252         if (err < 0)
 253                 return err;
 254
 255         err = ov7660_set_vflip(&sd->gspca_dev,
 256                 sensor_settings[VFLIP_IDX]);
 257
 258         return err;
 259 }
 260
 261 int ov7660_start(struct sd *sd)
 262 {
 263         return 0;
 264 }
 265
 266 int ov7660_stop(struct sd *sd)
 267 {
 268         return 0;
 269 }
 270
 271 void ov7660_disconnect(struct sd *sd)
 272 {
 273         ov7660_stop(sd);
 274
 275         sd->sensor = NULL;
 276         kfree(sd->sensor_priv);
 277 }
 278
 279 static int ov7660_get_gain(struct gspca_dev *gspca_dev, __s32 *val)
 280 {
 281         struct sd *sd = (struct sd *) gspca_dev;
 282         s32 *sensor_settings = sd->sensor_priv;
 283
 284         *val = sensor_settings[GAIN_IDX];
 285         PDEBUG(D_V4L2, "Read gain %d", *val);
 286         return 0;
 287 }
 288
 289 static int ov7660_set_gain(struct gspca_dev *gspca_dev, __s32 val)
 290 {
 291         int err;
 292         u8 i2c_data;
 293         struct sd *sd = (struct sd *) gspca_dev;
 294         s32 *sensor_settings = sd->sensor_priv;
 295
 296         PDEBUG(D_V4L2, "Setting gain to %d", val);
 297
 298         sensor_settings[GAIN_IDX] = val;
 299
 300         err = m5602_write_sensor(sd, OV7660_GAIN, &i2c_data, 1);
 301         return err;
 302 }
 303
 304
 305 static int ov7660_get_auto_white_balance(struct gspca_dev *gspca_dev,
 306                                          __s32 *val)
 307 {
 308         struct sd *sd = (struct sd *) gspca_dev;
 309         s32 *sensor_settings = sd->sensor_priv;
 310
 311         *val = sensor_settings[AUTO_WHITE_BALANCE_IDX];
 312         return 0;
 313 }
 314
 315 static int ov7660_set_auto_white_balance(struct gspca_dev *gspca_dev,
 316                                          __s32 val)
 317 {
 318         int err;
 319         u8 i2c_data;
 320         struct sd *sd = (struct sd *) gspca_dev;
 321         s32 *sensor_settings = sd->sensor_priv;
 322
 323         PDEBUG(D_V4L2, "Set auto white balance to %d", val);
 324
 325         sensor_settings[AUTO_WHITE_BALANCE_IDX] = val;
 326         err = m5602_read_sensor(sd, OV7660_COM8, &i2c_data, 1);
 327         if (err < 0)
 328                 return err;
 329
 330         i2c_data = ((i2c_data & 0xfd) | ((val & 0x01) << 1));
 331         err = m5602_write_sensor(sd, OV7660_COM8, &i2c_data, 1);
 332
 333         return err;
 334 }
 335
 336 static int ov7660_get_auto_gain(struct gspca_dev *gspca_dev, __s32 *val)
 337 {
 338         struct sd *sd = (struct sd *) gspca_dev;
 339         s32 *sensor_settings = sd->sensor_priv;
 340
 341         *val = sensor_settings[AUTO_GAIN_CTRL_IDX];
 342         PDEBUG(D_V4L2, "Read auto gain control %d", *val);
 343         return 0;
 344 }
 345
 346 static int ov7660_set_auto_gain(struct gspca_dev *gspca_dev, __s32 val)
 347 {
 348         int err;
 349         u8 i2c_data;
 350         struct sd *sd = (struct sd *) gspca_dev;
 351         s32 *sensor_settings = sd->sensor_priv;
 352
 353         PDEBUG(D_V4L2, "Set auto gain control to %d", val);
 354
 355         sensor_settings[AUTO_GAIN_CTRL_IDX] = val;
 356         err = m5602_read_sensor(sd, OV7660_COM8, &i2c_data, 1);
 357         if (err < 0)
 358                 return err;
 359
 360         i2c_data = ((i2c_data & 0xfb) | ((val & 0x01) << 2));
 361
 362         return m5602_write_sensor(sd, OV7660_COM8, &i2c_data, 1);
 363 }
 364
 365 static int ov7660_get_auto_exposure(struct gspca_dev *gspca_dev, __s32 *val)
 366 {
 367         struct sd *sd = (struct sd *) gspca_dev;
 368         s32 *sensor_settings = sd->sensor_priv;
 369
 370         *val = sensor_settings[AUTO_EXPOSURE_IDX];
 371         PDEBUG(D_V4L2, "Read auto exposure control %d", *val);
 372         return 0;
 373 }
 374
 375 static int ov7660_set_auto_exposure(struct gspca_dev *gspca_dev,
 376                                     __s32 val)
 377 {
 378         int err;
 379         u8 i2c_data;
 380         struct sd *sd = (struct sd *) gspca_dev;
 381         s32 *sensor_settings = sd->sensor_priv;
 382
 383         PDEBUG(D_V4L2, "Set auto exposure control to %d", val);
 384
 385         sensor_settings[AUTO_EXPOSURE_IDX] = val;
 386         err = m5602_read_sensor(sd, OV7660_COM8, &i2c_data, 1);
 387         if (err < 0)
 388                 return err;
 389
 390         i2c_data = ((i2c_data & 0xfe) | ((val & 0x01) << 0));
 391
 392         return m5602_write_sensor(sd, OV7660_COM8, &i2c_data, 1);
 393 }
 394
 395 static int ov7660_get_hflip(struct gspca_dev *gspca_dev, __s32 *val)
 396 {
 397         struct sd *sd = (struct sd *) gspca_dev;
 398         s32 *sensor_settings = sd->sensor_priv;
 399
 400         *val = sensor_settings[HFLIP_IDX];
 401         PDEBUG(D_V4L2, "Read horizontal flip %d", *val);
 402         return 0;
 403 }
 404
 405 static int ov7660_set_hflip(struct gspca_dev *gspca_dev, __s32 val)
 406 {
 407         int err;
 408         u8 i2c_data;
 409         struct sd *sd = (struct sd *) gspca_dev;
 410         s32 *sensor_settings = sd->sensor_priv;
 411
 412         PDEBUG(D_V4L2, "Set horizontal flip to %d", val);
 413
 414         sensor_settings[HFLIP_IDX] = val;
 415
 416         i2c_data = ((val & 0x01) << 5) |
 417                 (sensor_settings[VFLIP_IDX] << 4);
 418
 419         err = m5602_write_sensor(sd, OV7660_MVFP, &i2c_data, 1);
 420
 421         return err;
 422 }
 423
 424 static int ov7660_get_vflip(struct gspca_dev *gspca_dev, __s32 *val)
 425 {
 426         struct sd *sd = (struct sd *) gspca_dev;
 427         s32 *sensor_settings = sd->sensor_priv;
 428
 429         *val = sensor_settings[VFLIP_IDX];
 430         PDEBUG(D_V4L2, "Read vertical flip %d", *val);
 431
 432         return 0;
 433 }
 434
 435 static int ov7660_set_vflip(struct gspca_dev *gspca_dev, __s32 val)
 436 {
 437         int err;
 438         u8 i2c_data;
 439         struct sd *sd = (struct sd *) gspca_dev;
 440         s32 *sensor_settings = sd->sensor_priv;
 441
 442         PDEBUG(D_V4L2, "Set vertical flip to %d", val);
 443         sensor_settings[VFLIP_IDX] = val;
 444
 445         i2c_data = ((val & 0x01) << 4) | (sensor_settings[VFLIP_IDX] << 5);
 446         err = m5602_write_sensor(sd, OV7660_MVFP, &i2c_data, 1);
 447         if (err < 0)
 448                 return err;
 449
 450         /* When vflip is toggled we need to readjust the bridge hsync/vsync */
 451         if (gspca_dev->streaming)
 452                 err = ov7660_start(sd);
 453
 454         return err;
 455 }
 456
 457 static void ov7660_dump_registers(struct sd *sd)
 458 {
 459         int address;
 460         info("Dumping the ov7660 register state");
 461         for (address = 0; address < 0xa9; address++) {
 462                 u8 value;
 463                 m5602_read_sensor(sd, address, &value, 1);
 464                 info("register 0x%x contains 0x%x",
 465                      address, value);
 466         }
 467
 468         info("ov7660 register state dump complete");
 469
 470         info("Probing for which registers that are read/write");
 471         for (address = 0; address < 0xff; address++) {
 472                 u8 old_value, ctrl_value;
 473                 u8 test_value[2] = {0xff, 0xff};
 474
 475                 m5602_read_sensor(sd, address, &old_value, 1);
 476                 m5602_write_sensor(sd, address, test_value, 1);
 477                 m5602_read_sensor(sd, address, &ctrl_value, 1);
 478
 479                 if (ctrl_value == test_value[0])
 480                         info("register 0x%x is writeable", address);
 481                 else
 482                         info("register 0x%x is read only", address);
 483
 484                 /* Restore original value */
 485                 m5602_write_sensor(sd, address, &old_value, 1);
 486         }
 487 }