drivers/media/video/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 #include <media/v4l2-chip-ident.h>
  27
  28 #include "indycam.h"
  29
  30 #define INDYCAM_MODULE_VERSION "0.0.5"
  31
  32 MODULE_DESCRIPTION("SGI IndyCam driver");
  33 MODULE_VERSION(INDYCAM_MODULE_VERSION);
  34 MODULE_AUTHOR("Mikael Nousiainen <tmnousia@cc.hut.fi>");
  35 MODULE_LICENSE("GPL");
  36
  37
  38 // #define INDYCAM_DEBUG
  39
  40 #ifdef INDYCAM_DEBUG
  41 #define dprintk(x...) printk("IndyCam: " x);
  42 #define indycam_regdump(client) indycam_regdump_debug(client)
  43 #else
  44 #define dprintk(x...)
  45 #define indycam_regdump(client)
  46 #endif
  47
  48 struct indycam {
  49         struct v4l2_subdev sd;
  50         u8 version;
  51 };
  52
  53 static inline struct indycam *to_indycam(struct v4l2_subdev *sd)
  54 {
  55         return container_of(sd, struct indycam, sd);
  56 }
  57
  58 static const u8 initseq[] = {
  59         INDYCAM_CONTROL_AGCENA,         /* INDYCAM_CONTROL */
  60         INDYCAM_SHUTTER_60,             /* INDYCAM_SHUTTER */
  61         INDYCAM_GAIN_DEFAULT,           /* INDYCAM_GAIN */
  62         0x00,                           /* INDYCAM_BRIGHTNESS (read-only) */
  63         INDYCAM_RED_BALANCE_DEFAULT,    /* INDYCAM_RED_BALANCE */
  64         INDYCAM_BLUE_BALANCE_DEFAULT,   /* INDYCAM_BLUE_BALANCE */
  65         INDYCAM_RED_SATURATION_DEFAULT, /* INDYCAM_RED_SATURATION */
  66         INDYCAM_BLUE_SATURATION_DEFAULT,/* INDYCAM_BLUE_SATURATION */
  67 };
  68
  69 /* IndyCam register handling */
  70
  71 static int indycam_read_reg(struct v4l2_subdev *sd, u8 reg, u8 *value)
  72 {
  73         struct i2c_client *client = v4l2_get_subdevdata(sd);
  74         int ret;
  75
  76         if (reg == INDYCAM_REG_RESET) {
  77                 dprintk("indycam_read_reg(): "
  78                         "skipping write-only register %d\n", reg);
  79                 *value = 0;
  80                 return 0;
  81         }
  82
  83         ret = i2c_smbus_read_byte_data(client, reg);
  84
  85         if (ret < 0) {
  86                 printk(KERN_ERR "IndyCam: indycam_read_reg(): read failed, "
  87                        "register = 0x%02x\n", reg);
  88                 return ret;
  89         }
  90
  91         *value = (u8)ret;
  92
  93         return 0;
  94 }
  95
  96 static int indycam_write_reg(struct v4l2_subdev *sd, u8 reg, u8 value)
  97 {
  98         struct i2c_client *client = v4l2_get_subdevdata(sd);
  99         int err;
 100
 101         if (reg == INDYCAM_REG_BRIGHTNESS || reg == INDYCAM_REG_VERSION) {
 102                 dprintk("indycam_write_reg(): "
 103                         "skipping read-only register %d\n", reg);
 104                 return 0;
 105         }
 106
 107         dprintk("Writing Reg %d = 0x%02x\n", reg, value);
 108         err = i2c_smbus_write_byte_data(client, reg, value);
 109
 110         if (err) {
 111                 printk(KERN_ERR "IndyCam: indycam_write_reg(): write failed, "
 112                        "register = 0x%02x, value = 0x%02x\n", reg, value);
 113         }
 114         return err;
 115 }
 116
 117 static int indycam_write_block(struct v4l2_subdev *sd, u8 reg,
 118                                u8 length, u8 *data)
 119 {
 120         int i, err;
 121
 122         for (i = 0; i < length; i++) {
 123                 err = indycam_write_reg(sd, reg + i, data[i]);
 124                 if (err)
 125                         return err;
 126         }
 127
 128         return 0;
 129 }
 130
 131 /* Helper functions */
 132
 133 #ifdef INDYCAM_DEBUG
 134 static void indycam_regdump_debug(struct v4l2_subdev *sd)
 135 {
 136         int i;
 137         u8 val;
 138
 139         for (i = 0; i < 9; i++) {
 140                 indycam_read_reg(sd, i, &val);
 141                 dprintk("Reg %d = 0x%02x\n", i, val);
 142         }
 143 }
 144 #endif
 145
 146 static int indycam_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 147 {
 148         struct indycam *camera = to_indycam(sd);
 149         u8 reg;
 150         int ret = 0;
 151
 152         switch (ctrl->id) {
 153         case V4L2_CID_AUTOGAIN:
 154         case V4L2_CID_AUTO_WHITE_BALANCE:
 155                 ret = indycam_read_reg(sd, INDYCAM_REG_CONTROL, &reg);
 156                 if (ret)
 157                         return -EIO;
 158                 if (ctrl->id == V4L2_CID_AUTOGAIN)
 159                         ctrl->value = (reg & INDYCAM_CONTROL_AGCENA)
 160                                 ? 1 : 0;
 161                 else
 162                         ctrl->value = (reg & INDYCAM_CONTROL_AWBCTL)
 163                                 ? 1 : 0;
 164                 break;
 165         case V4L2_CID_EXPOSURE:
 166                 ret = indycam_read_reg(sd, INDYCAM_REG_SHUTTER, &reg);
 167                 if (ret)
 168                         return -EIO;
 169                 ctrl->value = ((s32)reg == 0x00) ? 0xff : ((s32)reg - 1);
 170                 break;
 171         case V4L2_CID_GAIN:
 172                 ret = indycam_read_reg(sd, INDYCAM_REG_GAIN, &reg);
 173                 if (ret)
 174                         return -EIO;
 175                 ctrl->value = (s32)reg;
 176                 break;
 177         case V4L2_CID_RED_BALANCE:
 178                 ret = indycam_read_reg(sd, INDYCAM_REG_RED_BALANCE, &reg);
 179                 if (ret)
 180                         return -EIO;
 181                 ctrl->value = (s32)reg;
 182                 break;
 183         case V4L2_CID_BLUE_BALANCE:
 184                 ret = indycam_read_reg(sd, INDYCAM_REG_BLUE_BALANCE, &reg);
 185                 if (ret)
 186                         return -EIO;
 187                 ctrl->value = (s32)reg;
 188                 break;
 189         case INDYCAM_CONTROL_RED_SATURATION:
 190                 ret = indycam_read_reg(sd,
 191                                        INDYCAM_REG_RED_SATURATION, &reg);
 192                 if (ret)
 193                         return -EIO;
 194                 ctrl->value = (s32)reg;
 195                 break;
 196         case INDYCAM_CONTROL_BLUE_SATURATION:
 197                 ret = indycam_read_reg(sd,
 198                                        INDYCAM_REG_BLUE_SATURATION, &reg);
 199                 if (ret)
 200                         return -EIO;
 201                 ctrl->value = (s32)reg;
 202                 break;
 203         case V4L2_CID_GAMMA:
 204                 if (camera->version == CAMERA_VERSION_MOOSE) {
 205                         ret = indycam_read_reg(sd,
 206                                                INDYCAM_REG_GAMMA, &reg);
 207                         if (ret)
 208                                 return -EIO;
 209                         ctrl->value = (s32)reg;
 210                 } else {
 211                         ctrl->value = INDYCAM_GAMMA_DEFAULT;
 212                 }
 213                 break;
 214         default:
 215                 ret = -EINVAL;
 216         }
 217
 218         return ret;
 219 }
 220
 221 static int indycam_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 222 {
 223         struct indycam *camera = to_indycam(sd);
 224         u8 reg;
 225         int ret = 0;
 226
 227         switch (ctrl->id) {
 228         case V4L2_CID_AUTOGAIN:
 229         case V4L2_CID_AUTO_WHITE_BALANCE:
 230                 ret = indycam_read_reg(sd, INDYCAM_REG_CONTROL, &reg);
 231                 if (ret)
 232                         break;
 233
 234                 if (ctrl->id == V4L2_CID_AUTOGAIN) {
 235                         if (ctrl->value)
 236                                 reg |= INDYCAM_CONTROL_AGCENA;
 237                         else
 238                                 reg &= ~INDYCAM_CONTROL_AGCENA;
 239                 } else {
 240                         if (ctrl->value)
 241                                 reg |= INDYCAM_CONTROL_AWBCTL;
 242                         else
 243                                 reg &= ~INDYCAM_CONTROL_AWBCTL;
 244                 }
 245
 246                 ret = indycam_write_reg(sd, INDYCAM_REG_CONTROL, reg);
 247                 break;
 248         case V4L2_CID_EXPOSURE:
 249                 reg = (ctrl->value == 0xff) ? 0x00 : (ctrl->value + 1);
 250                 ret = indycam_write_reg(sd, INDYCAM_REG_SHUTTER, reg);
 251                 break;
 252         case V4L2_CID_GAIN:
 253                 ret = indycam_write_reg(sd, INDYCAM_REG_GAIN, ctrl->value);
 254                 break;
 255         case V4L2_CID_RED_BALANCE:
 256                 ret = indycam_write_reg(sd, INDYCAM_REG_RED_BALANCE,
 257                                         ctrl->value);
 258                 break;
 259         case V4L2_CID_BLUE_BALANCE:
 260                 ret = indycam_write_reg(sd, INDYCAM_REG_BLUE_BALANCE,
 261                                         ctrl->value);
 262                 break;
 263         case INDYCAM_CONTROL_RED_SATURATION:
 264                 ret = indycam_write_reg(sd, INDYCAM_REG_RED_SATURATION,
 265                                         ctrl->value);
 266                 break;
 267         case INDYCAM_CONTROL_BLUE_SATURATION:
 268                 ret = indycam_write_reg(sd, INDYCAM_REG_BLUE_SATURATION,
 269                                         ctrl->value);
 270                 break;
 271         case V4L2_CID_GAMMA:
 272                 if (camera->version == CAMERA_VERSION_MOOSE) {
 273                         ret = indycam_write_reg(sd, INDYCAM_REG_GAMMA,
 274                                                 ctrl->value);
 275                 }
 276                 break;
 277         default:
 278                 ret = -EINVAL;
 279         }
 280
 281         return ret;
 282 }
 283
 284 /* I2C-interface */
 285
 286 static int indycam_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         struct indycam *camera = to_indycam(sd);
 291
 292         return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_INDYCAM,
 293                        camera->version);
 294 }
 295
 296 /* ----------------------------------------------------------------------- */
 297
 298 static const struct v4l2_subdev_core_ops indycam_core_ops = {
 299         .g_chip_ident = indycam_g_chip_ident,
 300         .g_ctrl = indycam_g_ctrl,
 301         .s_ctrl = indycam_s_ctrl,
 302 };
 303
 304 static const struct v4l2_subdev_ops indycam_ops = {
 305         .core = &indycam_core_ops,
 306 };
 307
 308 static int indycam_probe(struct i2c_client *client,
 309                           const struct i2c_device_id *id)
 310 {
 311         int err = 0;
 312         struct indycam *camera;
 313         struct v4l2_subdev *sd;
 314
 315         v4l_info(client, "chip found @ 0x%x (%s)\n",
 316                         client->addr << 1, client->adapter->name);
 317
 318         camera = kzalloc(sizeof(struct indycam), GFP_KERNEL);
 319         if (!camera)
 320                 return -ENOMEM;
 321
 322         sd = &camera->sd;
 323         v4l2_i2c_subdev_init(sd, client, &indycam_ops);
 324
 325         camera->version = i2c_smbus_read_byte_data(client,
 326                                                    INDYCAM_REG_VERSION);
 327         if (camera->version != CAMERA_VERSION_INDY &&
 328             camera->version != CAMERA_VERSION_MOOSE) {
 329                 kfree(camera);
 330                 return -ENODEV;
 331         }
 332
 333         printk(KERN_INFO "IndyCam v%d.%d detected\n",
 334                INDYCAM_VERSION_MAJOR(camera->version),
 335                INDYCAM_VERSION_MINOR(camera->version));
 336
 337         indycam_regdump(sd);
 338
 339         // initialize
 340         err = indycam_write_block(sd, 0, sizeof(initseq), (u8 *)&initseq);
 341         if (err) {
 342                 printk(KERN_ERR "IndyCam initialization failed\n");
 343                 kfree(camera);
 344                 return -EIO;
 345         }
 346
 347         indycam_regdump(sd);
 348
 349         // white balance
 350         err = indycam_write_reg(sd, INDYCAM_REG_CONTROL,
 351                           INDYCAM_CONTROL_AGCENA | INDYCAM_CONTROL_AWBCTL);
 352         if (err) {
 353                 printk(KERN_ERR "IndyCam: White balancing camera failed\n");
 354                 kfree(camera);
 355                 return -EIO;
 356         }
 357
 358         indycam_regdump(sd);
 359
 360         printk(KERN_INFO "IndyCam initialized\n");
 361
 362         return 0;
 363 }
 364
 365 static int indycam_remove(struct i2c_client *client)
 366 {
 367         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 368
 369         v4l2_device_unregister_subdev(sd);
 370         kfree(to_indycam(sd));
 371         return 0;
 372 }
 373
 374 static const struct i2c_device_id indycam_id[] = {
 375         { "indycam", 0 },
 376         { }
 377 };
 378 MODULE_DEVICE_TABLE(i2c, indycam_id);
 379
 380 static struct i2c_driver indycam_driver = {
 381         .driver = {
 382                 .owner  = THIS_MODULE,
 383                 .name   = "indycam",
 384         },
 385         .probe          = indycam_probe,
 386         .remove         = indycam_remove,
 387         .id_table       = indycam_id,
 388 };
 389
 390 static __init int init_indycam(void)
 391 {
 392         return i2c_add_driver(&indycam_driver);
 393 }
 394
 395 static __exit void exit_indycam(void)
 396 {
 397         i2c_del_driver(&indycam_driver);
 398 }
 399
 400 module_init(init_indycam);
 401 module_exit(exit_indycam);