drivers/media/platform/indycam.c

   1 /*
   2  *  indycam.c - Silicon Graphics IndyCam digital camera driver
   3  *
   4  *  Copyright (C) 2003 Ladislav Michl <ladis@linux-mips.org>
   5  *  Copyright (C) 2004,2005 Mikael Nousiainen <tmnousia@cc.hut.fi>
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License version 2 as
   9  *  published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/delay.h>
  13 #include <linux/errno.h>
  14 #include <linux/fs.h>
  15 #include <linux/init.h>
  16 #include <linux/kernel.h>
  17 #include <linux/major.h>
  18 #include <linux/module.h>
  19 #include <linux/mm.h>
  20 #include <linux/slab.h>
  21
  22 /* IndyCam decodes stream of photons into digital image representation ;-) */
  23 #include <linux/videodev2.h>
  24 #include <linux/i2c.h>
  25 #include <media/v4l2-device.h>
  26
  27 #include "indycam.h"
  28
  29 #define INDYCAM_MODULE_VERSION "0.0.5"
  30
  31 MODULE_DESCRIPTION("SGI IndyCam driver");
  32 MODULE_VERSION(INDYCAM_MODULE_VERSION);
  33 MODULE_AUTHOR("Mikael Nousiainen <tmnousia@cc.hut.fi>");
  34 MODULE_LICENSE("GPL");
  35
  36
  37 // #define INDYCAM_DEBUG
  38
  39 #ifdef INDYCAM_DEBUG
  40 #define dprintk(x...) printk("IndyCam: " x);
  41 #define indycam_regdump(client) indycam_regdump_debug(client)
  42 #else
  43 #define dprintk(x...)
  44 #define indycam_regdump(client)
  45 #endif
  46
  47 struct indycam {
  48         struct v4l2_subdev sd;
  49         u8 version;
  50 };
  51
  52 static inline struct indycam *to_indycam(struct v4l2_subdev *sd)
  53 {
  54         return container_of(sd, struct indycam, sd);
  55 }
  56
  57 static const u8 initseq[] = {
  58         INDYCAM_CONTROL_AGCENA,         /* INDYCAM_CONTROL */
  59         INDYCAM_SHUTTER_60,             /* INDYCAM_SHUTTER */
  60         INDYCAM_GAIN_DEFAULT,           /* INDYCAM_GAIN */
  61         0x00,                           /* INDYCAM_BRIGHTNESS (read-only) */
  62         INDYCAM_RED_BALANCE_DEFAULT,    /* INDYCAM_RED_BALANCE */
  63         INDYCAM_BLUE_BALANCE_DEFAULT,   /* INDYCAM_BLUE_BALANCE */
  64         INDYCAM_RED_SATURATION_DEFAULT, /* INDYCAM_RED_SATURATION */
  65         INDYCAM_BLUE_SATURATION_DEFAULT,/* INDYCAM_BLUE_SATURATION */
  66 };
  67
  68 /* IndyCam register handling */
  69
  70 static int indycam_read_reg(struct v4l2_subdev *sd, u8 reg, u8 *value)
  71 {
  72         struct i2c_client *client = v4l2_get_subdevdata(sd);
  73         int ret;
  74
  75         if (reg == INDYCAM_REG_RESET) {
  76                 dprintk("indycam_read_reg(): "
  77                         "skipping write-only register %d\n", reg);
  78                 *value = 0;
  79                 return 0;
  80         }
  81
  82         ret = i2c_smbus_read_byte_data(client, reg);
  83
  84         if (ret < 0) {
  85                 printk(KERN_ERR "IndyCam: indycam_read_reg(): read failed, "
  86                        "register = 0x%02x\n", reg);
  87                 return ret;
  88         }
  89
  90         *value = (u8)ret;
  91
  92         return 0;
  93 }
  94
  95 static int indycam_write_reg(struct v4l2_subdev *sd, u8 reg, u8 value)
  96 {
  97         struct i2c_client *client = v4l2_get_subdevdata(sd);
  98         int err;
  99
 100         if (reg == INDYCAM_REG_BRIGHTNESS || reg == INDYCAM_REG_VERSION) {
 101                 dprintk("indycam_write_reg(): "
 102                         "skipping read-only register %d\n", reg);
 103                 return 0;
 104         }
 105
 106         dprintk("Writing Reg %d = 0x%02x\n", reg, value);
 107         err = i2c_smbus_write_byte_data(client, reg, value);
 108
 109         if (err) {
 110                 printk(KERN_ERR "IndyCam: indycam_write_reg(): write failed, "
 111                        "register = 0x%02x, value = 0x%02x\n", reg, value);
 112         }
 113         return err;
 114 }
 115
 116 static int indycam_write_block(struct v4l2_subdev *sd, u8 reg,
 117                                u8 length, u8 *data)
 118 {
 119         int i, err;
 120
 121         for (i = 0; i < length; i++) {
 122                 err = indycam_write_reg(sd, reg + i, data[i]);
 123                 if (err)
 124                         return err;
 125         }
 126
 127         return 0;
 128 }
 129
 130 /* Helper functions */
 131
 132 #ifdef INDYCAM_DEBUG
 133 static void indycam_regdump_debug(struct v4l2_subdev *sd)
 134 {
 135         int i;
 136         u8 val;
 137
 138         for (i = 0; i < 9; i++) {
 139                 indycam_read_reg(sd, i, &val);
 140                 dprintk("Reg %d = 0x%02x\n", i, val);
 141         }
 142 }
 143 #endif
 144
 145 static int indycam_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 146 {
 147         struct indycam *camera = to_indycam(sd);
 148         u8 reg;
 149         int ret = 0;
 150
 151         switch (ctrl->id) {
 152         case V4L2_CID_AUTOGAIN:
 153         case V4L2_CID_AUTO_WHITE_BALANCE:
 154                 ret = indycam_read_reg(sd, INDYCAM_REG_CONTROL, &reg);
 155                 if (ret)
 156                         return -EIO;
 157                 if (ctrl->id == V4L2_CID_AUTOGAIN)
 158                         ctrl->value = (reg & INDYCAM_CONTROL_AGCENA)
 159                                 ? 1 : 0;
 160                 else
 161                         ctrl->value = (reg & INDYCAM_CONTROL_AWBCTL)
 162                                 ? 1 : 0;
 163                 break;
 164         case V4L2_CID_EXPOSURE:
 165                 ret = indycam_read_reg(sd, INDYCAM_REG_SHUTTER, &reg);
 166                 if (ret)
 167                         return -EIO;
 168                 ctrl->value = ((s32)reg == 0x00) ? 0xff : ((s32)reg - 1);
 169                 break;
 170         case V4L2_CID_GAIN:
 171                 ret = indycam_read_reg(sd, INDYCAM_REG_GAIN, &reg);
 172                 if (ret)
 173                         return -EIO;
 174                 ctrl->value = (s32)reg;
 175                 break;
 176         case V4L2_CID_RED_BALANCE:
 177                 ret = indycam_read_reg(sd, INDYCAM_REG_RED_BALANCE, &reg);
 178                 if (ret)
 179                         return -EIO;
 180                 ctrl->value = (s32)reg;
 181                 break;
 182         case V4L2_CID_BLUE_BALANCE:
 183                 ret = indycam_read_reg(sd, INDYCAM_REG_BLUE_BALANCE, &reg);
 184                 if (ret)
 185                         return -EIO;
 186                 ctrl->value = (s32)reg;
 187                 break;
 188         case INDYCAM_CONTROL_RED_SATURATION:
 189                 ret = indycam_read_reg(sd,
 190                                        INDYCAM_REG_RED_SATURATION, &reg);
 191                 if (ret)
 192                         return -EIO;
 193                 ctrl->value = (s32)reg;
 194                 break;
 195         case INDYCAM_CONTROL_BLUE_SATURATION:
 196                 ret = indycam_read_reg(sd,
 197                                        INDYCAM_REG_BLUE_SATURATION, &reg);
 198                 if (ret)
 199                         return -EIO;
 200                 ctrl->value = (s32)reg;
 201                 break;
 202         case V4L2_CID_GAMMA:
 203                 if (camera->version == CAMERA_VERSION_MOOSE) {
 204                         ret = indycam_read_reg(sd,
 205                                                INDYCAM_REG_GAMMA, &reg);
 206                         if (ret)
 207                                 return -EIO;
 208                         ctrl->value = (s32)reg;
 209                 } else {
 210                         ctrl->value = INDYCAM_GAMMA_DEFAULT;
 211                 }
 212                 break;
 213         default:
 214                 ret = -EINVAL;
 215         }
 216
 217         return ret;
 218 }
 219
 220 static int indycam_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 221 {
 222         struct indycam *camera = to_indycam(sd);
 223         u8 reg;
 224         int ret = 0;
 225
 226         switch (ctrl->id) {
 227         case V4L2_CID_AUTOGAIN:
 228         case V4L2_CID_AUTO_WHITE_BALANCE:
 229                 ret = indycam_read_reg(sd, INDYCAM_REG_CONTROL, &reg);
 230                 if (ret)
 231                         break;
 232
 233                 if (ctrl->id == V4L2_CID_AUTOGAIN) {
 234                         if (ctrl->value)
 235                                 reg |= INDYCAM_CONTROL_AGCENA;
 236                         else
 237                                 reg &= ~INDYCAM_CONTROL_AGCENA;
 238                 } else {
 239                         if (ctrl->value)
 240                                 reg |= INDYCAM_CONTROL_AWBCTL;
 241                         else
 242                                 reg &= ~INDYCAM_CONTROL_AWBCTL;
 243                 }
 244
 245                 ret = indycam_write_reg(sd, INDYCAM_REG_CONTROL, reg);
 246                 break;
 247         case V4L2_CID_EXPOSURE:
 248                 reg = (ctrl->value == 0xff) ? 0x00 : (ctrl->value + 1);
 249                 ret = indycam_write_reg(sd, INDYCAM_REG_SHUTTER, reg);
 250                 break;
 251         case V4L2_CID_GAIN:
 252                 ret = indycam_write_reg(sd, INDYCAM_REG_GAIN, ctrl->value);
 253                 break;
 254         case V4L2_CID_RED_BALANCE:
 255                 ret = indycam_write_reg(sd, INDYCAM_REG_RED_BALANCE,
 256                                         ctrl->value);
 257                 break;
 258         case V4L2_CID_BLUE_BALANCE:
 259                 ret = indycam_write_reg(sd, INDYCAM_REG_BLUE_BALANCE,
 260                                         ctrl->value);
 261                 break;
 262         case INDYCAM_CONTROL_RED_SATURATION:
 263                 ret = indycam_write_reg(sd, INDYCAM_REG_RED_SATURATION,
 264                                         ctrl->value);
 265                 break;
 266         case INDYCAM_CONTROL_BLUE_SATURATION:
 267                 ret = indycam_write_reg(sd, INDYCAM_REG_BLUE_SATURATION,
 268                                         ctrl->value);
 269                 break;
 270         case V4L2_CID_GAMMA:
 271                 if (camera->version == CAMERA_VERSION_MOOSE) {
 272                         ret = indycam_write_reg(sd, INDYCAM_REG_GAMMA,
 273                                                 ctrl->value);
 274                 }
 275                 break;
 276         default:
 277                 ret = -EINVAL;
 278         }
 279
 280         return ret;
 281 }
 282
 283 /* I2C-interface */
 284
 285 /* ----------------------------------------------------------------------- */
 286
 287 static const struct v4l2_subdev_core_ops indycam_core_ops = {
 288         .g_ctrl = indycam_g_ctrl,
 289         .s_ctrl = indycam_s_ctrl,
 290 };
 291
 292 static const struct v4l2_subdev_ops indycam_ops = {
 293         .core = &indycam_core_ops,
 294 };
 295
 296 static int indycam_probe(struct i2c_client *client,
 297                           const struct i2c_device_id *id)
 298 {
 299         int err = 0;
 300         struct indycam *camera;
 301         struct v4l2_subdev *sd;
 302
 303         v4l_info(client, "chip found @ 0x%x (%s)\n",
 304                         client->addr << 1, client->adapter->name);
 305
 306         camera = kzalloc(sizeof(struct indycam), GFP_KERNEL);
 307         if (!camera)
 308                 return -ENOMEM;
 309
 310         sd = &camera->sd;
 311         v4l2_i2c_subdev_init(sd, client, &indycam_ops);
 312
 313         camera->version = i2c_smbus_read_byte_data(client,
 314                                                    INDYCAM_REG_VERSION);
 315         if (camera->version != CAMERA_VERSION_INDY &&
 316             camera->version != CAMERA_VERSION_MOOSE) {
 317                 kfree(camera);
 318                 return -ENODEV;
 319         }
 320
 321         printk(KERN_INFO "IndyCam v%d.%d detected\n",
 322                INDYCAM_VERSION_MAJOR(camera->version),
 323                INDYCAM_VERSION_MINOR(camera->version));
 324
 325         indycam_regdump(sd);
 326
 327         // initialize
 328         err = indycam_write_block(sd, 0, sizeof(initseq), (u8 *)&initseq);
 329         if (err) {
 330                 printk(KERN_ERR "IndyCam initialization failed\n");
 331                 kfree(camera);
 332                 return -EIO;
 333         }
 334
 335         indycam_regdump(sd);
 336
 337         // white balance
 338         err = indycam_write_reg(sd, INDYCAM_REG_CONTROL,
 339                           INDYCAM_CONTROL_AGCENA | INDYCAM_CONTROL_AWBCTL);
 340         if (err) {
 341                 printk(KERN_ERR "IndyCam: White balancing camera failed\n");
 342                 kfree(camera);
 343                 return -EIO;
 344         }
 345
 346         indycam_regdump(sd);
 347
 348         printk(KERN_INFO "IndyCam initialized\n");
 349
 350         return 0;
 351 }
 352
 353 static int indycam_remove(struct i2c_client *client)
 354 {
 355         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 356
 357         v4l2_device_unregister_subdev(sd);
 358         kfree(to_indycam(sd));
 359         return 0;
 360 }
 361
 362 static const struct i2c_device_id indycam_id[] = {
 363         { "indycam", 0 },
 364         { }
 365 };
 366 MODULE_DEVICE_TABLE(i2c, indycam_id);
 367
 368 static struct i2c_driver indycam_driver = {
 369         .driver = {
 370                 .owner  = THIS_MODULE,
 371                 .name   = "indycam",
 372         },
 373         .probe          = indycam_probe,
 374         .remove         = indycam_remove,
 375         .id_table       = indycam_id,
 376 };
 377
 378 module_i2c_driver(indycam_driver);