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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  20
  21 #include "m5602_ov7660.h"
  22
  23 static int ov7660_get_gain(struct gspca_dev *gspca_dev, __s32 *val);
  24 static int ov7660_set_gain(struct gspca_dev *gspca_dev, __s32 val);
  25 static int ov7660_get_auto_white_balance(struct gspca_dev *gspca_dev,
  26                                          __s32 *val);
  27 static int ov7660_set_auto_white_balance(struct gspca_dev *gspca_dev,
  28                                          __s32 val);
  29 static int ov7660_get_auto_gain(struct gspca_dev *gspca_dev, __s32 *val);
  30 static int ov7660_set_auto_gain(struct gspca_dev *gspca_dev, __s32 val);
  31 static int ov7660_get_auto_exposure(struct gspca_dev *gspca_dev, __s32 *val);
  32 static int ov7660_set_auto_exposure(struct gspca_dev *gspca_dev, __s32 val);
  33 static int ov7660_get_hflip(struct gspca_dev *gspca_dev, __s32 *val);
  34 static int ov7660_set_hflip(struct gspca_dev *gspca_dev, __s32 val);
  35 static int ov7660_get_vflip(struct gspca_dev *gspca_dev, __s32 *val);
  36 static int ov7660_set_vflip(struct gspca_dev *gspca_dev, __s32 val);
  37
  38 static const struct ctrl ov7660_ctrls[] = {
  39 #define GAIN_IDX 1
  40         {
  41                 {
  42                         .id             = V4L2_CID_GAIN,
  43                         .type           = V4L2_CTRL_TYPE_INTEGER,
  44                         .name           = "gain",
  45                         .minimum        = 0x00,
  46                         .maximum        = 0xff,
  47                         .step           = 0x1,
  48                         .default_value  = OV7660_DEFAULT_GAIN,
  49                         .flags          = V4L2_CTRL_FLAG_SLIDER
  50                 },
  51                 .set = ov7660_set_gain,
  52                 .get = ov7660_get_gain
  53         },
  54 #define BLUE_BALANCE_IDX 2
  55 #define RED_BALANCE_IDX 3
  56 #define AUTO_WHITE_BALANCE_IDX 4
  57         {
  58                 {
  59                         .id             = V4L2_CID_AUTO_WHITE_BALANCE,
  60                         .type           = V4L2_CTRL_TYPE_BOOLEAN,
  61                         .name           = "auto white balance",
  62                         .minimum        = 0,
  63                         .maximum        = 1,
  64                         .step           = 1,
  65                         .default_value  = 1
  66                 },
  67                 .set = ov7660_set_auto_white_balance,
  68                 .get = ov7660_get_auto_white_balance
  69         },
  70 #define AUTO_GAIN_CTRL_IDX 5
  71         {
  72                 {
  73                         .id             = V4L2_CID_AUTOGAIN,
  74                         .type           = V4L2_CTRL_TYPE_BOOLEAN,
  75                         .name           = "auto gain control",
  76                         .minimum        = 0,
  77                         .maximum        = 1,
  78                         .step           = 1,
  79                         .default_value  = 1
  80                 },
  81                 .set = ov7660_set_auto_gain,
  82                 .get = ov7660_get_auto_gain
  83         },
  84 #define AUTO_EXPOSURE_IDX 6
  85         {
  86                 {
  87                         .id             = V4L2_CID_EXPOSURE_AUTO,
  88                         .type           = V4L2_CTRL_TYPE_BOOLEAN,
  89                         .name           = "auto exposure",
  90                         .minimum        = 0,
  91                         .maximum        = 1,
  92                         .step           = 1,
  93                         .default_value  = 1
  94                 },
  95                 .set = ov7660_set_auto_exposure,
  96                 .get = ov7660_get_auto_exposure
  97         },
  98 #define HFLIP_IDX 7
  99         {
 100                 {
 101                         .id             = V4L2_CID_HFLIP,
 102                         .type           = V4L2_CTRL_TYPE_BOOLEAN,
 103                         .name           = "horizontal flip",
 104                         .minimum        = 0,
 105                         .maximum        = 1,
 106                         .step           = 1,
 107                         .default_value  = 0
 108                 },
 109                 .set = ov7660_set_hflip,
 110                 .get = ov7660_get_hflip
 111         },
 112 #define VFLIP_IDX 8
 113         {
 114                 {
 115                         .id             = V4L2_CID_VFLIP,
 116                         .type           = V4L2_CTRL_TYPE_BOOLEAN,
 117                         .name           = "vertical flip",
 118                         .minimum        = 0,
 119                         .maximum        = 1,
 120                         .step           = 1,
 121                         .default_value  = 0
 122                 },
 123                 .set = ov7660_set_vflip,
 124                 .get = ov7660_get_vflip
 125         },
 126
 127 };
 128
 129 static struct v4l2_pix_format ov7660_modes[] = {
 130         {
 131                 640,
 132                 480,
 133                 V4L2_PIX_FMT_SBGGR8,
 134                 V4L2_FIELD_NONE,
 135                 .sizeimage =
 136                         640 * 480,
 137                 .bytesperline = 640,
 138                 .colorspace = V4L2_COLORSPACE_SRGB,
 139                 .priv = 0
 140         }
 141 };
 142
 143 static void ov7660_dump_registers(struct sd *sd);
 144
 145 int ov7660_probe(struct sd *sd)
 146 {
 147         int err = 0, i;
 148         u8 prod_id = 0, ver_id = 0;
 149
 150         s32 *sensor_settings;
 151
 152         if (force_sensor) {
 153                 if (force_sensor == OV7660_SENSOR) {
 154                         pr_info("Forcing an %s sensor\n", ov7660.name);
 155                         goto sensor_found;
 156                 }
 157                 /* If we want to force another sensor,
 158                 don't try to probe this one */
 159                 return -ENODEV;
 160         }
 161
 162         /* Do the preinit */
 163         for (i = 0; i < ARRAY_SIZE(preinit_ov7660) && !err; i++) {
 164                 u8 data[2];
 165
 166                 if (preinit_ov7660[i][0] == BRIDGE) {
 167                         err = m5602_write_bridge(sd,
 168                                 preinit_ov7660[i][1],
 169                                 preinit_ov7660[i][2]);
 170                 } else {
 171                         data[0] = preinit_ov7660[i][2];
 172                         err = m5602_write_sensor(sd,
 173                                 preinit_ov7660[i][1], data, 1);
 174                 }
 175         }
 176         if (err < 0)
 177                 return err;
 178
 179         if (m5602_read_sensor(sd, OV7660_PID, &prod_id, 1))
 180                 return -ENODEV;
 181
 182         if (m5602_read_sensor(sd, OV7660_VER, &ver_id, 1))
 183                 return -ENODEV;
 184
 185         pr_info("Sensor reported 0x%x%x\n", prod_id, ver_id);
 186
 187         if ((prod_id == 0x76) && (ver_id == 0x60)) {
 188                 pr_info("Detected a ov7660 sensor\n");
 189                 goto sensor_found;
 190         }
 191         return -ENODEV;
 192
 193 sensor_found:
 194         sensor_settings = kmalloc(
 195                 ARRAY_SIZE(ov7660_ctrls) * sizeof(s32), GFP_KERNEL);
 196         if (!sensor_settings)
 197                 return -ENOMEM;
 198
 199         sd->gspca_dev.cam.cam_mode = ov7660_modes;
 200         sd->gspca_dev.cam.nmodes = ARRAY_SIZE(ov7660_modes);
 201         sd->desc->ctrls = ov7660_ctrls;
 202         sd->desc->nctrls = ARRAY_SIZE(ov7660_ctrls);
 203
 204         for (i = 0; i < ARRAY_SIZE(ov7660_ctrls); i++)
 205                 sensor_settings[i] = ov7660_ctrls[i].qctrl.default_value;
 206         sd->sensor_priv = sensor_settings;
 207
 208         return 0;
 209 }
 210
 211 int ov7660_init(struct sd *sd)
 212 {
 213         int i, err = 0;
 214         s32 *sensor_settings = sd->sensor_priv;
 215
 216         /* Init the sensor */
 217         for (i = 0; i < ARRAY_SIZE(init_ov7660); i++) {
 218                 u8 data[2];
 219
 220                 if (init_ov7660[i][0] == BRIDGE) {
 221                         err = m5602_write_bridge(sd,
 222                                 init_ov7660[i][1],
 223                                 init_ov7660[i][2]);
 224                 } else {
 225                         data[0] = init_ov7660[i][2];
 226                         err = m5602_write_sensor(sd,
 227                                 init_ov7660[i][1], data, 1);
 228                 }
 229         }
 230
 231         if (dump_sensor)
 232                 ov7660_dump_registers(sd);
 233
 234         err = ov7660_set_gain(&sd->gspca_dev, sensor_settings[GAIN_IDX]);
 235         if (err < 0)
 236                 return err;
 237
 238         err = ov7660_set_auto_white_balance(&sd->gspca_dev,
 239                 sensor_settings[AUTO_WHITE_BALANCE_IDX]);
 240         if (err < 0)
 241                 return err;
 242
 243         err = ov7660_set_auto_gain(&sd->gspca_dev,
 244                 sensor_settings[AUTO_GAIN_CTRL_IDX]);
 245         if (err < 0)
 246                 return err;
 247
 248         err = ov7660_set_auto_exposure(&sd->gspca_dev,
 249                 sensor_settings[AUTO_EXPOSURE_IDX]);
 250         if (err < 0)
 251                 return err;
 252         err = ov7660_set_hflip(&sd->gspca_dev,
 253                 sensor_settings[HFLIP_IDX]);
 254         if (err < 0)
 255                 return err;
 256
 257         err = ov7660_set_vflip(&sd->gspca_dev,
 258                 sensor_settings[VFLIP_IDX]);
 259
 260         return err;
 261 }
 262
 263 int ov7660_start(struct sd *sd)
 264 {
 265         return 0;
 266 }
 267
 268 int ov7660_stop(struct sd *sd)
 269 {
 270         return 0;
 271 }
 272
 273 void ov7660_disconnect(struct sd *sd)
 274 {
 275         ov7660_stop(sd);
 276
 277         sd->sensor = NULL;
 278         kfree(sd->sensor_priv);
 279 }
 280
 281 static int ov7660_get_gain(struct gspca_dev *gspca_dev, __s32 *val)
 282 {
 283         struct sd *sd = (struct sd *) gspca_dev;
 284         s32 *sensor_settings = sd->sensor_priv;
 285
 286         *val = sensor_settings[GAIN_IDX];
 287         PDEBUG(D_V4L2, "Read gain %d", *val);
 288         return 0;
 289 }
 290
 291 static int ov7660_set_gain(struct gspca_dev *gspca_dev, __s32 val)
 292 {
 293         int err;
 294         u8 i2c_data;
 295         struct sd *sd = (struct sd *) gspca_dev;
 296         s32 *sensor_settings = sd->sensor_priv;
 297
 298         PDEBUG(D_V4L2, "Setting gain to %d", val);
 299
 300         sensor_settings[GAIN_IDX] = val;
 301
 302         err = m5602_write_sensor(sd, OV7660_GAIN, &i2c_data, 1);
 303         return err;
 304 }
 305
 306
 307 static int ov7660_get_auto_white_balance(struct gspca_dev *gspca_dev,
 308                                          __s32 *val)
 309 {
 310         struct sd *sd = (struct sd *) gspca_dev;
 311         s32 *sensor_settings = sd->sensor_priv;
 312
 313         *val = sensor_settings[AUTO_WHITE_BALANCE_IDX];
 314         return 0;
 315 }
 316
 317 static int ov7660_set_auto_white_balance(struct gspca_dev *gspca_dev,
 318                                          __s32 val)
 319 {
 320         int err;
 321         u8 i2c_data;
 322         struct sd *sd = (struct sd *) gspca_dev;
 323         s32 *sensor_settings = sd->sensor_priv;
 324
 325         PDEBUG(D_V4L2, "Set auto white balance to %d", val);
 326
 327         sensor_settings[AUTO_WHITE_BALANCE_IDX] = val;
 328         err = m5602_read_sensor(sd, OV7660_COM8, &i2c_data, 1);
 329         if (err < 0)
 330                 return err;
 331
 332         i2c_data = ((i2c_data & 0xfd) | ((val & 0x01) << 1));
 333         err = m5602_write_sensor(sd, OV7660_COM8, &i2c_data, 1);
 334
 335         return err;
 336 }
 337
 338 static int ov7660_get_auto_gain(struct gspca_dev *gspca_dev, __s32 *val)
 339 {
 340         struct sd *sd = (struct sd *) gspca_dev;
 341         s32 *sensor_settings = sd->sensor_priv;
 342
 343         *val = sensor_settings[AUTO_GAIN_CTRL_IDX];
 344         PDEBUG(D_V4L2, "Read auto gain control %d", *val);
 345         return 0;
 346 }
 347
 348 static int ov7660_set_auto_gain(struct gspca_dev *gspca_dev, __s32 val)
 349 {
 350         int err;
 351         u8 i2c_data;
 352         struct sd *sd = (struct sd *) gspca_dev;
 353         s32 *sensor_settings = sd->sensor_priv;
 354
 355         PDEBUG(D_V4L2, "Set auto gain control to %d", val);
 356
 357         sensor_settings[AUTO_GAIN_CTRL_IDX] = val;
 358         err = m5602_read_sensor(sd, OV7660_COM8, &i2c_data, 1);
 359         if (err < 0)
 360                 return err;
 361
 362         i2c_data = ((i2c_data & 0xfb) | ((val & 0x01) << 2));
 363
 364         return m5602_write_sensor(sd, OV7660_COM8, &i2c_data, 1);
 365 }
 366
 367 static int ov7660_get_auto_exposure(struct gspca_dev *gspca_dev, __s32 *val)
 368 {
 369         struct sd *sd = (struct sd *) gspca_dev;
 370         s32 *sensor_settings = sd->sensor_priv;
 371
 372         *val = sensor_settings[AUTO_EXPOSURE_IDX];
 373         PDEBUG(D_V4L2, "Read auto exposure control %d", *val);
 374         return 0;
 375 }
 376
 377 static int ov7660_set_auto_exposure(struct gspca_dev *gspca_dev,
 378                                     __s32 val)
 379 {
 380         int err;
 381         u8 i2c_data;
 382         struct sd *sd = (struct sd *) gspca_dev;
 383         s32 *sensor_settings = sd->sensor_priv;
 384
 385         PDEBUG(D_V4L2, "Set auto exposure control to %d", val);
 386
 387         sensor_settings[AUTO_EXPOSURE_IDX] = val;
 388         err = m5602_read_sensor(sd, OV7660_COM8, &i2c_data, 1);
 389         if (err < 0)
 390                 return err;
 391
 392         i2c_data = ((i2c_data & 0xfe) | ((val & 0x01) << 0));
 393
 394         return m5602_write_sensor(sd, OV7660_COM8, &i2c_data, 1);
 395 }
 396
 397 static int ov7660_get_hflip(struct gspca_dev *gspca_dev, __s32 *val)
 398 {
 399         struct sd *sd = (struct sd *) gspca_dev;
 400         s32 *sensor_settings = sd->sensor_priv;
 401
 402         *val = sensor_settings[HFLIP_IDX];
 403         PDEBUG(D_V4L2, "Read horizontal flip %d", *val);
 404         return 0;
 405 }
 406
 407 static int ov7660_set_hflip(struct gspca_dev *gspca_dev, __s32 val)
 408 {
 409         int err;
 410         u8 i2c_data;
 411         struct sd *sd = (struct sd *) gspca_dev;
 412         s32 *sensor_settings = sd->sensor_priv;
 413
 414         PDEBUG(D_V4L2, "Set horizontal flip to %d", val);
 415
 416         sensor_settings[HFLIP_IDX] = val;
 417
 418         i2c_data = ((val & 0x01) << 5) |
 419                 (sensor_settings[VFLIP_IDX] << 4);
 420
 421         err = m5602_write_sensor(sd, OV7660_MVFP, &i2c_data, 1);
 422
 423         return err;
 424 }
 425
 426 static int ov7660_get_vflip(struct gspca_dev *gspca_dev, __s32 *val)
 427 {
 428         struct sd *sd = (struct sd *) gspca_dev;
 429         s32 *sensor_settings = sd->sensor_priv;
 430
 431         *val = sensor_settings[VFLIP_IDX];
 432         PDEBUG(D_V4L2, "Read vertical flip %d", *val);
 433
 434         return 0;
 435 }
 436
 437 static int ov7660_set_vflip(struct gspca_dev *gspca_dev, __s32 val)
 438 {
 439         int err;
 440         u8 i2c_data;
 441         struct sd *sd = (struct sd *) gspca_dev;
 442         s32 *sensor_settings = sd->sensor_priv;
 443
 444         PDEBUG(D_V4L2, "Set vertical flip to %d", val);
 445         sensor_settings[VFLIP_IDX] = val;
 446
 447         i2c_data = ((val & 0x01) << 4) | (sensor_settings[VFLIP_IDX] << 5);
 448         err = m5602_write_sensor(sd, OV7660_MVFP, &i2c_data, 1);
 449         if (err < 0)
 450                 return err;
 451
 452         /* When vflip is toggled we need to readjust the bridge hsync/vsync */
 453         if (gspca_dev->streaming)
 454                 err = ov7660_start(sd);
 455
 456         return err;
 457 }
 458
 459 static void ov7660_dump_registers(struct sd *sd)
 460 {
 461         int address;
 462         pr_info("Dumping the ov7660 register state\n");
 463         for (address = 0; address < 0xa9; address++) {
 464                 u8 value;
 465                 m5602_read_sensor(sd, address, &value, 1);
 466                 pr_info("register 0x%x contains 0x%x\n", address, value);
 467         }
 468
 469         pr_info("ov7660 register state dump complete\n");
 470
 471         pr_info("Probing for which registers that are read/write\n");
 472         for (address = 0; address < 0xff; address++) {
 473                 u8 old_value, ctrl_value;
 474                 u8 test_value[2] = {0xff, 0xff};
 475
 476                 m5602_read_sensor(sd, address, &old_value, 1);
 477                 m5602_write_sensor(sd, address, test_value, 1);
 478                 m5602_read_sensor(sd, address, &ctrl_value, 1);
 479
 480                 if (ctrl_value == test_value[0])
 481                         pr_info("register 0x%x is writeable\n", address);
 482                 else
 483                         pr_info("register 0x%x is read only\n", address);
 484
 485                 /* Restore original value */
 486                 m5602_write_sensor(sd, address, &old_value, 1);
 487         }
 488 }