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   1 /*
   2  * mt9v011 -Micron 1/4-Inch VGA Digital Image Sensor
   3  *
   4  * Copyright (c) 2009 Mauro Carvalho Chehab (mchehab@redhat.com)
   5  * This code is placed under the terms of the GNU General Public License v2
   6  */
   7
   8 #include <linux/i2c.h>
   9 #include <linux/videodev2.h>
  10 #include <linux/delay.h>
  11 #include <media/v4l2-device.h>
  12 #include "mt9v011.h"
  13 #include <media/v4l2-i2c-drv.h>
  14 #include <media/v4l2-chip-ident.h>
  15
  16 MODULE_DESCRIPTION("Micron mt9v011 sensor driver");
  17 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@redhat.com>");
  18 MODULE_LICENSE("GPL");
  19
  20
  21 static int debug;
  22 module_param(debug, int, 0);
  23 MODULE_PARM_DESC(debug, "Debug level (0-2)");
  24
  25 /* supported controls */
  26 static struct v4l2_queryctrl mt9v011_qctrl[] = {
  27         {
  28                 .id = V4L2_CID_GAIN,
  29                 .type = V4L2_CTRL_TYPE_INTEGER,
  30                 .name = "Gain",
  31                 .minimum = 0,
  32                 .maximum = (1 << 10) - 1,
  33                 .step = 1,
  34                 .default_value = 0x0020,
  35                 .flags = 0,
  36         }, {
  37                 .id = V4L2_CID_RED_BALANCE,
  38                 .type = V4L2_CTRL_TYPE_INTEGER,
  39                 .name = "Red Balance",
  40                 .minimum = -1 << 9,
  41                 .maximum = (1 << 9) - 1,
  42                 .step = 1,
  43                 .default_value = 0,
  44                 .flags = 0,
  45         }, {
  46                 .id = V4L2_CID_BLUE_BALANCE,
  47                 .type = V4L2_CTRL_TYPE_INTEGER,
  48                 .name = "Blue Balance",
  49                 .minimum = -1 << 9,
  50                 .maximum = (1 << 9) - 1,
  51                 .step = 1,
  52                 .default_value = 0,
  53                 .flags = 0,
  54         },
  55 };
  56
  57 struct mt9v011 {
  58         struct v4l2_subdev sd;
  59         unsigned width, height;
  60
  61         u16 global_gain, red_bal, blue_bal;
  62 };
  63
  64 static inline struct mt9v011 *to_mt9v011(struct v4l2_subdev *sd)
  65 {
  66         return container_of(sd, struct mt9v011, sd);
  67 }
  68
  69 static int mt9v011_read(struct v4l2_subdev *sd, unsigned char addr)
  70 {
  71         struct i2c_client *c = v4l2_get_subdevdata(sd);
  72         __be16 buffer;
  73         int rc, val;
  74
  75         rc = i2c_master_send(c, &addr, 1);
  76         if (rc != 1)
  77                 v4l2_dbg(0, debug, sd,
  78                          "i2c i/o error: rc == %d (should be 1)\n", rc);
  79
  80         msleep(10);
  81
  82         rc = i2c_master_recv(c, (char *)&buffer, 2);
  83         if (rc != 2)
  84                 v4l2_dbg(0, debug, sd,
  85                          "i2c i/o error: rc == %d (should be 2)\n", rc);
  86
  87         val = be16_to_cpu(buffer);
  88
  89         v4l2_dbg(2, debug, sd, "mt9v011: read 0x%02x = 0x%04x\n", addr, val);
  90
  91         return val;
  92 }
  93
  94 static void mt9v011_write(struct v4l2_subdev *sd, unsigned char addr,
  95                                  u16 value)
  96 {
  97         struct i2c_client *c = v4l2_get_subdevdata(sd);
  98         unsigned char buffer[3];
  99         int rc;
 100
 101         buffer[0] = addr;
 102         buffer[1] = value >> 8;
 103         buffer[2] = value & 0xff;
 104
 105         v4l2_dbg(2, debug, sd,
 106                  "mt9v011: writing 0x%02x 0x%04x\n", buffer[0], value);
 107         rc = i2c_master_send(c, buffer, 3);
 108         if (rc != 3)
 109                 v4l2_dbg(0, debug, sd,
 110                          "i2c i/o error: rc == %d (should be 3)\n", rc);
 111 }
 112
 113
 114 struct i2c_reg_value {
 115         unsigned char reg;
 116         u16           value;
 117 };
 118
 119 /*
 120  * Values used at the original driver
 121  * Some values are marked as Reserved at the datasheet
 122  */
 123 static const struct i2c_reg_value mt9v011_init_default[] = {
 124                 { R0D_MT9V011_RESET, 0x0001 },
 125                 { R0D_MT9V011_RESET, 0x0000 },
 126
 127                 { R09_MT9V011_SHUTTER_WIDTH, 0x0418 },
 128                 { R0A_MT9V011_CLK_SPEED, 0x0000 },
 129                 { R0C_MT9V011_SHUTTER_DELAY, 0x0000 },
 130                 { R1E_MT9V011_DIGITAL_ZOOM,  0x0000 },
 131                 { R20_MT9V011_READ_MODE, 0x1100 },
 132
 133                 /*
 134                  * Those registers are not docummented at the datasheet.
 135                  * However, the original driver initializes them
 136                  */
 137                 { 0x30, 0x0005 },
 138                 { 0x34, 0x0100 },
 139                 { 0x3d, 0x068f },
 140                 { 0x40, 0x01e0 },
 141                 { 0x52, 0x0100 },
 142                 { 0x58, 0x0038 },       /* Datasheet default 0x0078 */
 143                 { 0x59, 0x0723 },       /* Datasheet default 0x0703 */
 144                 { 0x62, 0x041a },       /* Datasheet default 0x0418 */
 145
 146                 { R07_MT9V011_OUT_CTRL, 0x000a },       /* chip enable */
 147 };
 148
 149 static void set_balance(struct v4l2_subdev *sd)
 150 {
 151         struct mt9v011 *core = to_mt9v011(sd);
 152         u16 green1_gain, green2_gain, blue_gain, red_gain;
 153
 154         green1_gain = core->global_gain;
 155         green2_gain = core->global_gain;
 156
 157         blue_gain = core->global_gain +
 158                     core->global_gain * core->blue_bal / (1 << 9);
 159
 160         red_gain = core->global_gain +
 161                    core->global_gain * core->blue_bal / (1 << 9);
 162
 163         mt9v011_write(sd, R2B_MT9V011_GREEN_1_GAIN, green1_gain);
 164         mt9v011_write(sd, R2E_MT9V011_GREEN_2_GAIN,  green1_gain);
 165         mt9v011_write(sd, R2C_MT9V011_BLUE_GAIN, blue_gain);
 166         mt9v011_write(sd, R2D_MT9V011_RED_GAIN, red_gain);
 167 }
 168
 169 static void set_res(struct v4l2_subdev *sd)
 170 {
 171         struct mt9v011 *core = to_mt9v011(sd);
 172         unsigned vstart, hstart;
 173
 174         /*
 175          * The mt9v011 doesn't have scaling. So, in order to select the desired
 176          * resolution, we're cropping at the middle of the sensor.
 177          * hblank and vblank should be adjusted, in order to warrant that
 178          * we'll preserve the line timings for 30 fps, no matter what resolution
 179          * is selected.
 180          */
 181
 182         hstart = 14 + (640 - core->width) / 2;
 183         mt9v011_write(sd, R02_MT9V011_COLSTART, hstart);
 184         mt9v011_write(sd, R04_MT9V011_WIDTH, core->width);
 185         mt9v011_write(sd, R05_MT9V011_HBLANK, 771 - core->width);
 186
 187         vstart = 8 + (640 - core->height) / 2;
 188         mt9v011_write(sd, R01_MT9V011_ROWSTART, vstart);
 189         mt9v011_write(sd, R03_MT9V011_HEIGHT, core->height);
 190         mt9v011_write(sd, R06_MT9V011_VBLANK, 508 - core->height);
 191 };
 192
 193 static int mt9v011_reset(struct v4l2_subdev *sd, u32 val)
 194 {
 195         int i;
 196
 197         for (i = 0; i < ARRAY_SIZE(mt9v011_init_default); i++)
 198                 mt9v011_write(sd, mt9v011_init_default[i].reg,
 199                                mt9v011_init_default[i].value);
 200
 201         set_balance(sd);
 202         set_res(sd);
 203
 204         return 0;
 205 };
 206
 207 static int mt9v011_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 208 {
 209         struct mt9v011 *core = to_mt9v011(sd);
 210
 211         v4l2_dbg(1, debug, sd, "g_ctrl called\n");
 212
 213         switch (ctrl->id) {
 214         case V4L2_CID_GAIN:
 215                 ctrl->value = core->global_gain;
 216                 return 0;
 217         case V4L2_CID_RED_BALANCE:
 218                 ctrl->value = core->red_bal;
 219                 return 0;
 220         case V4L2_CID_BLUE_BALANCE:
 221                 ctrl->value = core->blue_bal;
 222                 return 0;
 223         }
 224         return -EINVAL;
 225 }
 226
 227 static int mt9v011_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 228 {
 229         struct mt9v011 *core = to_mt9v011(sd);
 230         u8 i, n;
 231         n = ARRAY_SIZE(mt9v011_qctrl);
 232
 233         for (i = 0; i < n; i++) {
 234                 if (ctrl->id != mt9v011_qctrl[i].id)
 235                         continue;
 236                 if (ctrl->value < mt9v011_qctrl[i].minimum ||
 237                     ctrl->value > mt9v011_qctrl[i].maximum)
 238                         return -ERANGE;
 239                 v4l2_dbg(1, debug, sd, "s_ctrl: id=%d, value=%d\n",
 240                                         ctrl->id, ctrl->value);
 241                 break;
 242         }
 243
 244         switch (ctrl->id) {
 245         case V4L2_CID_GAIN:
 246                 core->global_gain = ctrl->value;
 247                 break;
 248         case V4L2_CID_RED_BALANCE:
 249                 core->red_bal = ctrl->value;
 250                 break;
 251         case V4L2_CID_BLUE_BALANCE:
 252                 core->blue_bal = ctrl->value;
 253                 break;
 254         default:
 255                 return -EINVAL;
 256         }
 257
 258         set_balance(sd);
 259
 260         return 0;
 261 }
 262
 263 static int mt9v011_enum_fmt(struct v4l2_subdev *sd, struct v4l2_fmtdesc *fmt)
 264 {
 265         if (fmt->index > 0)
 266                 return -EINVAL;
 267
 268         fmt->flags = 0;
 269         strcpy(fmt->description, "8 bpp Bayer GRGR..BGBG");
 270         fmt->pixelformat = V4L2_PIX_FMT_SGRBG8;
 271
 272         return 0;
 273 }
 274
 275 static int mt9v011_try_fmt(struct v4l2_subdev *sd, struct v4l2_format *fmt)
 276 {
 277         struct v4l2_pix_format *pix = &fmt->fmt.pix;
 278
 279         if (pix->pixelformat != V4L2_PIX_FMT_SGRBG8)
 280                 return -EINVAL;
 281
 282         v4l_bound_align_image(&pix->width, 48, 639, 1,
 283                               &pix->height, 32, 480, 1, 0);
 284
 285         return 0;
 286 }
 287
 288 static int mt9v011_s_fmt(struct v4l2_subdev *sd, struct v4l2_format *fmt)
 289 {
 290         struct v4l2_pix_format *pix = &fmt->fmt.pix;
 291         struct mt9v011 *core = to_mt9v011(sd);
 292         int rc;
 293
 294         rc = mt9v011_try_fmt(sd, fmt);
 295         if (rc < 0)
 296                 return -EINVAL;
 297
 298         core->width = pix->width;
 299         core->height = pix->height;
 300
 301         set_res(sd);
 302
 303         return 0;
 304 }
 305
 306
 307 #ifdef CONFIG_VIDEO_ADV_DEBUG
 308 static int mt9v011_g_register(struct v4l2_subdev *sd,
 309                               struct v4l2_dbg_register *reg)
 310 {
 311         struct i2c_client *client = v4l2_get_subdevdata(sd);
 312
 313         if (!v4l2_chip_match_i2c_client(client, &reg->match))
 314                 return -EINVAL;
 315         if (!capable(CAP_SYS_ADMIN))
 316                 return -EPERM;
 317
 318         reg->val = mt9v011_read(sd, reg->reg & 0xff);
 319         reg->size = 2;
 320
 321         return 0;
 322 }
 323
 324 static int mt9v011_s_register(struct v4l2_subdev *sd,
 325                               struct v4l2_dbg_register *reg)
 326 {
 327         struct i2c_client *client = v4l2_get_subdevdata(sd);
 328
 329         if (!v4l2_chip_match_i2c_client(client, &reg->match))
 330                 return -EINVAL;
 331         if (!capable(CAP_SYS_ADMIN))
 332                 return -EPERM;
 333
 334         mt9v011_write(sd, reg->reg & 0xff, reg->val & 0xffff);
 335
 336         return 0;
 337 }
 338 #endif
 339
 340 static int mt9v011_g_chip_ident(struct v4l2_subdev *sd,
 341                                 struct v4l2_dbg_chip_ident *chip)
 342 {
 343         struct i2c_client *client = v4l2_get_subdevdata(sd);
 344
 345         return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_MT9V011,
 346                                           MT9V011_VERSION);
 347 }
 348
 349 static const struct v4l2_subdev_core_ops mt9v011_core_ops = {
 350         .g_ctrl = mt9v011_g_ctrl,
 351         .s_ctrl = mt9v011_s_ctrl,
 352         .reset = mt9v011_reset,
 353         .g_chip_ident = mt9v011_g_chip_ident,
 354 #ifdef CONFIG_VIDEO_ADV_DEBUG
 355         .g_register = mt9v011_g_register,
 356         .s_register = mt9v011_s_register,
 357 #endif
 358 };
 359
 360 static const struct v4l2_subdev_video_ops mt9v011_video_ops = {
 361         .enum_fmt = mt9v011_enum_fmt,
 362         .try_fmt = mt9v011_try_fmt,
 363         .s_fmt = mt9v011_s_fmt,
 364 };
 365
 366 static const struct v4l2_subdev_ops mt9v011_ops = {
 367         .core  = &mt9v011_core_ops,
 368         .video = &mt9v011_video_ops,
 369 };
 370
 371
 372 /****************************************************************************
 373                         I2C Client & Driver
 374  ****************************************************************************/
 375
 376 static int mt9v011_probe(struct i2c_client *c,
 377                          const struct i2c_device_id *id)
 378 {
 379         u16 version;
 380         struct mt9v011 *core;
 381         struct v4l2_subdev *sd;
 382
 383         /* Check if the adapter supports the needed features */
 384         if (!i2c_check_functionality(c->adapter,
 385              I2C_FUNC_SMBUS_READ_BYTE | I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
 386                 return -EIO;
 387
 388         core = kzalloc(sizeof(struct mt9v011), GFP_KERNEL);
 389         if (!core)
 390                 return -ENOMEM;
 391
 392         sd = &core->sd;
 393         v4l2_i2c_subdev_init(sd, c, &mt9v011_ops);
 394
 395         /* Check if the sensor is really a MT9V011 */
 396         version = mt9v011_read(sd, R00_MT9V011_CHIP_VERSION);
 397         if (version != MT9V011_VERSION) {
 398                 v4l2_info(sd, "*** unknown micron chip detected (0x%04x.\n",
 399                           version);
 400                 kfree(core);
 401                 return -EINVAL;
 402         }
 403
 404         core->global_gain = 0x0024;
 405         core->width  = 640;
 406         core->height = 480;
 407
 408         v4l_info(c, "chip found @ 0x%02x (%s)\n",
 409                  c->addr << 1, c->adapter->name);
 410
 411         return 0;
 412 }
 413
 414 static int mt9v011_remove(struct i2c_client *c)
 415 {
 416         struct v4l2_subdev *sd = i2c_get_clientdata(c);
 417
 418         v4l2_dbg(1, debug, sd,
 419                 "mt9v011.c: removing mt9v011 adapter on address 0x%x\n",
 420                 c->addr << 1);
 421
 422         v4l2_device_unregister_subdev(sd);
 423         kfree(to_mt9v011(sd));
 424         return 0;
 425 }
 426
 427 /* ----------------------------------------------------------------------- */
 428
 429 static const struct i2c_device_id mt9v011_id[] = {
 430         { "mt9v011", 0 },
 431         { }
 432 };
 433 MODULE_DEVICE_TABLE(i2c, mt9v011_id);
 434
 435 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
 436         .name = "mt9v011",
 437         .probe = mt9v011_probe,
 438         .remove = mt9v011_remove,
 439         .id_table = mt9v011_id,
 440 };