git.oblomov.eu Git - linux-2.6/blob - drivers/media/video/mt9v011.c

   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
  60         u16 global_gain, red_bal, blue_bal;
  61 };
  62
  63 static inline struct mt9v011 *to_mt9v011(struct v4l2_subdev *sd)
  64 {
  65         return container_of(sd, struct mt9v011, sd);
  66 }
  67
  68 static int mt9v011_read(struct v4l2_subdev *sd, unsigned char addr)
  69 {
  70         struct i2c_client *c = v4l2_get_subdevdata(sd);
  71         __be16 buffer;
  72         int rc, val;
  73
  74         rc = i2c_master_send(c, &addr, 1);
  75         if (rc != 1)
  76                 v4l2_dbg(0, debug, sd,
  77                          "i2c i/o error: rc == %d (should be 1)\n", rc);
  78
  79         msleep(10);
  80
  81         rc = i2c_master_recv(c, (char *)&buffer, 2);
  82         if (rc != 2)
  83                 v4l2_dbg(0, debug, sd,
  84                          "i2c i/o error: rc == %d (should be 2)\n", rc);
  85
  86         val = be16_to_cpu(buffer);
  87
  88         v4l2_dbg(2, debug, sd, "mt9v011: read 0x%02x = 0x%04x\n", addr, val);
  89
  90         return val;
  91 }
  92
  93 static void mt9v011_write(struct v4l2_subdev *sd, unsigned char addr,
  94                                  u16 value)
  95 {
  96         struct i2c_client *c = v4l2_get_subdevdata(sd);
  97         unsigned char buffer[3];
  98         int rc;
  99
 100         buffer[0] = addr;
 101         buffer[1] = value >> 8;
 102         buffer[2] = value & 0xff;
 103
 104         v4l2_dbg(2, debug, sd,
 105                  "mt9v011: writing 0x%02x 0x%04x\n", buffer[0], value);
 106         rc = i2c_master_send(c, &buffer, 3);
 107         if (rc != 3)
 108                 v4l2_dbg(0, debug, sd,
 109                          "i2c i/o error: rc == %d (should be 3)\n", rc);
 110 }
 111
 112
 113 struct i2c_reg_value {
 114         unsigned char reg;
 115         u16           value;
 116 };
 117
 118 /*
 119  * Values used at the original driver
 120  * Some values are marked as Reserved at the datasheet
 121  */
 122 static const struct i2c_reg_value mt9v011_init_default[] = {
 123                 { R0D_MT9V011_RESET, 0x0001 },
 124                 { R0D_MT9V011_RESET, 0x0000 },
 125
 126                 { R01_MT9V011_ROWSTART, 0x0008 },
 127                 { R02_MT9V011_COLSTART, 0x0014 },
 128                 { R03_MT9V011_HEIGHT, 0x01e0 },
 129                 { R04_MT9V011_WIDTH, 0x0280 },
 130                 { R05_MT9V011_HBLANK, 0x007b },
 131                 { R06_MT9V011_VBLANK, 0x001c },
 132                 { R09_MT9V011_SHUTTER_WIDTH, 0x0418 },
 133                 { R0A_MT9V011_CLK_SPEED, 0x0000 },
 134                 { R0C_MT9V011_SHUTTER_DELAY, 0x0000 },
 135                 { R1E_MT9V011_DIGITAL_ZOOM,  0x0000 },
 136                 { R20_MT9V011_READ_MODE, 0x1100 },
 137
 138                 /*
 139                  * Those registers are not docummented at the datasheet.
 140                  * However, the original driver initializes them
 141                  */
 142                 { 0x30, 0x0005 },
 143                 { 0x34, 0x0100 },
 144                 { 0x3d, 0x068f },
 145                 { 0x40, 0x01e0 },
 146                 { 0x52, 0x0100 },
 147                 { 0x58, 0x0038 },       /* Datasheet default 0x0078 */
 148                 { 0x59, 0x0723 },       /* Datasheet default 0x0703 */
 149                 { 0x62, 0x041a },       /* Datasheet default 0x0418 */
 150
 151                 { R07_MT9V011_OUT_CTRL, 0x000a },       /* chip enable */
 152 };
 153
 154 static void set_balance(struct v4l2_subdev *sd)
 155 {
 156         struct mt9v011 *core = to_mt9v011(sd);
 157         u16 green1_gain, green2_gain, blue_gain, red_gain;
 158
 159         green1_gain = core->global_gain;
 160         green2_gain = core->global_gain;
 161
 162         blue_gain = core->global_gain +
 163                     core->global_gain * core->blue_bal / (1 << 9);
 164
 165         red_gain = core->global_gain +
 166                    core->global_gain * core->blue_bal / (1 << 9);
 167
 168         mt9v011_write(sd, R2B_MT9V011_GREEN_1_GAIN, green1_gain);
 169         mt9v011_write(sd, R2E_MT9V011_GREEN_2_GAIN,  green1_gain);
 170         mt9v011_write(sd, R2C_MT9V011_BLUE_GAIN, blue_gain);
 171         mt9v011_write(sd, R2D_MT9V011_RED_GAIN, red_gain);
 172 }
 173
 174 static int mt9v011_reset(struct v4l2_subdev *sd, u32 val)
 175 {
 176         u16 version;
 177         int i;
 178
 179         version = mt9v011_read(sd, R00_MT9V011_CHIP_VERSION);
 180
 181         if (version != MT9V011_VERSION) {
 182                 v4l2_info(sd, "*** unknown micron chip detected (0x%04x.\n",
 183                           version);
 184                 return -EINVAL;
 185
 186         }
 187
 188         for (i = 0; i < ARRAY_SIZE(mt9v011_init_default); i++)
 189                 mt9v011_write(sd, mt9v011_init_default[i].reg,
 190                                mt9v011_init_default[i].value);
 191
 192         set_balance(sd);
 193
 194         return 0;
 195 };
 196
 197 static int mt9v011_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 198 {
 199         struct mt9v011 *core = to_mt9v011(sd);
 200
 201         v4l2_dbg(1, debug, sd, "g_ctrl called\n");
 202
 203         switch (ctrl->id) {
 204         case V4L2_CID_GAIN:
 205                 ctrl->value = core->global_gain;
 206                 return 0;
 207         case V4L2_CID_RED_BALANCE:
 208                 ctrl->value = core->red_bal;
 209                 return 0;
 210         case V4L2_CID_BLUE_BALANCE:
 211                 ctrl->value = core->blue_bal;
 212                 return 0;
 213         }
 214         return -EINVAL;
 215 }
 216
 217 static int mt9v011_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 218 {
 219         struct mt9v011 *core = to_mt9v011(sd);
 220         u8 i, n;
 221         n = ARRAY_SIZE(mt9v011_qctrl);
 222
 223         for (i = 0; i < n; i++) {
 224                 if (ctrl->id != mt9v011_qctrl[i].id)
 225                         continue;
 226                 if (ctrl->value < mt9v011_qctrl[i].minimum ||
 227                     ctrl->value > mt9v011_qctrl[i].maximum)
 228                         return -ERANGE;
 229                 v4l2_dbg(1, debug, sd, "s_ctrl: id=%d, value=%d\n",
 230                                         ctrl->id, ctrl->value);
 231                 break;
 232         }
 233
 234         switch (ctrl->id) {
 235         case V4L2_CID_GAIN:
 236                 core->global_gain = ctrl->value;
 237                 break;
 238         case V4L2_CID_RED_BALANCE:
 239                 core->red_bal = ctrl->value;
 240                 break;
 241         case V4L2_CID_BLUE_BALANCE:
 242                 core->blue_bal = ctrl->value;
 243                 break;
 244         default:
 245                 return -EINVAL;
 246         }
 247
 248         set_balance(sd);
 249
 250         return 0;
 251 }
 252
 253 #ifdef CONFIG_VIDEO_ADV_DEBUG
 254 static int mt9v011_g_register(struct v4l2_subdev *sd,
 255                               struct v4l2_dbg_register *reg)
 256 {
 257         struct i2c_client *client = v4l2_get_subdevdata(sd);
 258
 259         if (!v4l2_chip_match_i2c_client(client, &reg->match))
 260                 return -EINVAL;
 261         if (!capable(CAP_SYS_ADMIN))
 262                 return -EPERM;
 263
 264         reg->val = mt9v011_read(sd, reg->reg & 0xff);
 265         reg->size = 2;
 266
 267         return 0;
 268 }
 269
 270 static int mt9v011_s_register(struct v4l2_subdev *sd,
 271                               struct v4l2_dbg_register *reg)
 272 {
 273         struct i2c_client *client = v4l2_get_subdevdata(sd);
 274
 275         if (!v4l2_chip_match_i2c_client(client, &reg->match))
 276                 return -EINVAL;
 277         if (!capable(CAP_SYS_ADMIN))
 278                 return -EPERM;
 279
 280         mt9v011_write(sd, reg->reg & 0xff, reg->val & 0xffff);
 281
 282         return 0;
 283 }
 284 #endif
 285
 286 static int mt9v011_g_chip_ident(struct v4l2_subdev *sd,
 287                                 struct v4l2_dbg_chip_ident *chip)
 288 {
 289         struct i2c_client *client = v4l2_get_subdevdata(sd);
 290
 291         return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_MT9V011,
 292                                           MT9V011_VERSION);
 293 }
 294
 295 static const struct v4l2_subdev_core_ops mt9v011_core_ops = {
 296         .g_ctrl = mt9v011_g_ctrl,
 297         .s_ctrl = mt9v011_s_ctrl,
 298         .reset = mt9v011_reset,
 299         .g_chip_ident = mt9v011_g_chip_ident,
 300 #ifdef CONFIG_VIDEO_ADV_DEBUG
 301         .g_register = mt9v011_g_register,
 302         .s_register = mt9v011_s_register,
 303 #endif
 304 };
 305
 306 static const struct v4l2_subdev_ops mt9v011_ops = {
 307         .core = &mt9v011_core_ops,
 308 };
 309
 310
 311 /****************************************************************************
 312                         I2C Client & Driver
 313  ****************************************************************************/
 314
 315 static int mt9v011_probe(struct i2c_client *c,
 316                          const struct i2c_device_id *id)
 317 {
 318         struct mt9v011 *core;
 319         struct v4l2_subdev *sd;
 320
 321         /* Check if the adapter supports the needed features */
 322         if (!i2c_check_functionality(c->adapter,
 323              I2C_FUNC_SMBUS_READ_BYTE | I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
 324                 return -EIO;
 325
 326         core = kzalloc(sizeof(struct mt9v011), GFP_KERNEL);
 327         if (!core)
 328                 return -ENOMEM;
 329
 330         core->global_gain = 0x0024;
 331
 332         sd = &core->sd;
 333         v4l2_i2c_subdev_init(sd, c, &mt9v011_ops);
 334         v4l_info(c, "chip found @ 0x%02x (%s)\n",
 335                  c->addr << 1, c->adapter->name);
 336
 337         return 0;
 338 }
 339
 340 static int mt9v011_remove(struct i2c_client *c)
 341 {
 342         struct v4l2_subdev *sd = i2c_get_clientdata(c);
 343
 344         v4l2_dbg(1, debug, sd,
 345                 "mt9v011.c: removing mt9v011 adapter on address 0x%x\n",
 346                 c->addr << 1);
 347
 348         v4l2_device_unregister_subdev(sd);
 349         kfree(to_mt9v011(sd));
 350         return 0;
 351 }
 352
 353 /* ----------------------------------------------------------------------- */
 354
 355 static const struct i2c_device_id mt9v011_id[] = {
 356         { "mt9v011", 0 },
 357         { }
 358 };
 359 MODULE_DEVICE_TABLE(i2c, mt9v011_id);
 360
 361 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
 362         .name = "mt9v011",
 363         .probe = mt9v011_probe,
 364         .remove = mt9v011_remove,
 365         .id_table = mt9v011_id,
 366 };