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/sched.h>
  21 #include <linux/slab.h>
  22
  23 #include <linux/videodev.h>
  24 /* IndyCam decodes stream of photons into digital image representation ;-) */
  25 #include <linux/video_decoder.h>
  26 #include <linux/i2c.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 // #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 i2c_client *client;
  49         u8 version;
  50 };
  51
  52 static struct i2c_driver i2c_driver_indycam;
  53
  54 static const u8 initseq[] = {
  55         INDYCAM_CONTROL_AGCENA,         /* INDYCAM_CONTROL */
  56         INDYCAM_SHUTTER_60,             /* INDYCAM_SHUTTER */
  57         INDYCAM_GAIN_DEFAULT,           /* INDYCAM_GAIN */
  58         0x00,                           /* INDYCAM_BRIGHTNESS (read-only) */
  59         INDYCAM_RED_BALANCE_DEFAULT,    /* INDYCAM_RED_BALANCE */
  60         INDYCAM_BLUE_BALANCE_DEFAULT,   /* INDYCAM_BLUE_BALANCE */
  61         INDYCAM_RED_SATURATION_DEFAULT, /* INDYCAM_RED_SATURATION */
  62         INDYCAM_BLUE_SATURATION_DEFAULT,/* INDYCAM_BLUE_SATURATION */
  63 };
  64
  65 /* IndyCam register handling */
  66
  67 static int indycam_read_reg(struct i2c_client *client, u8 reg, u8 *value)
  68 {
  69         int ret;
  70
  71         if (reg == INDYCAM_REG_RESET) {
  72                 dprintk("indycam_read_reg(): "
  73                         "skipping write-only register %d\n", reg);
  74                 *value = 0;
  75                 return 0;
  76         }
  77
  78         ret = i2c_smbus_read_byte_data(client, reg);
  79
  80         if (ret < 0) {
  81                 printk(KERN_ERR "IndyCam: indycam_read_reg(): read failed, "
  82                        "register = 0x%02x\n", reg);
  83                 return ret;
  84         }
  85
  86         *value = (u8)ret;
  87
  88         return 0;
  89 }
  90
  91 static int indycam_write_reg(struct i2c_client *client, u8 reg, u8 value)
  92 {
  93         int err;
  94
  95         if ((reg == INDYCAM_REG_BRIGHTNESS)
  96             || (reg == INDYCAM_REG_VERSION)) {
  97                 dprintk("indycam_write_reg(): "
  98                         "skipping read-only register %d\n", reg);
  99                 return 0;
 100         }
 101
 102         dprintk("Writing Reg %d = 0x%02x\n", reg, value);
 103         err = i2c_smbus_write_byte_data(client, reg, value);
 104
 105         if (err) {
 106                 printk(KERN_ERR "IndyCam: indycam_write_reg(): write failed, "
 107                        "register = 0x%02x, value = 0x%02x\n", reg, value);
 108         }
 109         return err;
 110 }
 111
 112 static int indycam_write_block(struct i2c_client *client, u8 reg,
 113                                u8 length, u8 *data)
 114 {
 115         int i, err;
 116
 117         for (i = 0; i < length; i++) {
 118                 err = indycam_write_reg(client, reg + i, data[i]);
 119                 if (err)
 120                         return err;
 121         }
 122
 123         return 0;
 124 }
 125
 126 /* Helper functions */
 127
 128 #ifdef INDYCAM_DEBUG
 129 static void indycam_regdump_debug(struct i2c_client *client)
 130 {
 131         int i;
 132         u8 val;
 133
 134         for (i = 0; i < 9; i++) {
 135                 indycam_read_reg(client, i, &val);
 136                 dprintk("Reg %d = 0x%02x\n", i, val);
 137         }
 138 }
 139 #endif
 140
 141 static int indycam_get_control(struct i2c_client *client,
 142                                struct indycam_control *ctrl)
 143 {
 144         struct indycam *camera = i2c_get_clientdata(client);
 145         u8 reg;
 146         int ret = 0;
 147
 148         switch (ctrl->type) {
 149         case INDYCAM_CONTROL_AGC:
 150         case INDYCAM_CONTROL_AWB:
 151                 ret = indycam_read_reg(client, INDYCAM_REG_CONTROL, &reg);
 152                 if (ret)
 153                         return -EIO;
 154                 if (ctrl->type == INDYCAM_CONTROL_AGC)
 155                         ctrl->value = (reg & INDYCAM_CONTROL_AGCENA)
 156                                 ? 1 : 0;
 157                 else
 158                         ctrl->value = (reg & INDYCAM_CONTROL_AWBCTL)
 159                                 ? 1 : 0;
 160                 break;
 161         case INDYCAM_CONTROL_SHUTTER:
 162                 ret = indycam_read_reg(client, INDYCAM_REG_SHUTTER, &reg);
 163                 if (ret)
 164                         return -EIO;
 165                 ctrl->value = ((s32)reg == 0x00) ? 0xff : ((s32)reg - 1);
 166                 break;
 167         case INDYCAM_CONTROL_GAIN:
 168                 ret = indycam_read_reg(client, INDYCAM_REG_GAIN, &reg);
 169                 if (ret)
 170                         return -EIO;
 171                 ctrl->value = (s32)reg;
 172                 break;
 173         case INDYCAM_CONTROL_RED_BALANCE:
 174                 ret = indycam_read_reg(client, INDYCAM_REG_RED_BALANCE, &reg);
 175                 if (ret)
 176                         return -EIO;
 177                 ctrl->value = (s32)reg;
 178                 break;
 179         case INDYCAM_CONTROL_BLUE_BALANCE:
 180                 ret = indycam_read_reg(client, INDYCAM_REG_BLUE_BALANCE, &reg);
 181                 if (ret)
 182                         return -EIO;
 183                 ctrl->value = (s32)reg;
 184                 break;
 185         case INDYCAM_CONTROL_RED_SATURATION:
 186                 ret = indycam_read_reg(client,
 187                                        INDYCAM_REG_RED_SATURATION, &reg);
 188                 if (ret)
 189                         return -EIO;
 190                 ctrl->value = (s32)reg;
 191                 break;
 192         case INDYCAM_CONTROL_BLUE_SATURATION:
 193                 ret = indycam_read_reg(client,
 194                                        INDYCAM_REG_BLUE_SATURATION, &reg);
 195                 if (ret)
 196                         return -EIO;
 197                 ctrl->value = (s32)reg;
 198                 break;
 199         case INDYCAM_CONTROL_GAMMA:
 200                 if (camera->version == CAMERA_VERSION_MOOSE) {
 201                         ret = indycam_read_reg(client,
 202                                                INDYCAM_REG_GAMMA, &reg);
 203                         if (ret)
 204                                 return -EIO;
 205                         ctrl->value = (s32)reg;
 206                 } else {
 207                         ctrl->value = INDYCAM_GAMMA_DEFAULT;
 208                 }
 209                 break;
 210         default:
 211                 ret = -EINVAL;
 212         }
 213
 214         return ret;
 215 }
 216
 217 static int indycam_set_control(struct i2c_client *client,
 218                                struct indycam_control *ctrl)
 219 {
 220         struct indycam *camera = i2c_get_clientdata(client);
 221         u8 reg;
 222         int ret = 0;
 223
 224         switch (ctrl->type) {
 225         case INDYCAM_CONTROL_AGC:
 226         case INDYCAM_CONTROL_AWB:
 227                 ret = indycam_read_reg(client, INDYCAM_REG_CONTROL, &reg);
 228                 if (ret)
 229                         break;
 230
 231                 if (ctrl->type == INDYCAM_CONTROL_AGC) {
 232                         if (ctrl->value)
 233                                 reg |= INDYCAM_CONTROL_AGCENA;
 234                         else
 235                                 reg &= ~INDYCAM_CONTROL_AGCENA;
 236                 } else {
 237                         if (ctrl->value)
 238                                 reg |= INDYCAM_CONTROL_AWBCTL;
 239                         else
 240                                 reg &= ~INDYCAM_CONTROL_AWBCTL;
 241                 }
 242
 243                 ret = indycam_write_reg(client, INDYCAM_REG_CONTROL, reg);
 244                 break;
 245         case INDYCAM_CONTROL_SHUTTER:
 246                 reg = (ctrl->value == 0xff) ? 0x00 : (ctrl->value + 1);
 247                 ret = indycam_write_reg(client, INDYCAM_REG_SHUTTER, reg);
 248                 break;
 249         case INDYCAM_CONTROL_GAIN:
 250                 ret = indycam_write_reg(client, INDYCAM_REG_GAIN, ctrl->value);
 251                 break;
 252         case INDYCAM_CONTROL_RED_BALANCE:
 253                 ret = indycam_write_reg(client, INDYCAM_REG_RED_BALANCE,
 254                                         ctrl->value);
 255                 break;
 256         case INDYCAM_CONTROL_BLUE_BALANCE:
 257                 ret = indycam_write_reg(client, INDYCAM_REG_BLUE_BALANCE,
 258                                         ctrl->value);
 259                 break;
 260         case INDYCAM_CONTROL_RED_SATURATION:
 261                 ret = indycam_write_reg(client, INDYCAM_REG_RED_SATURATION,
 262                                         ctrl->value);
 263                 break;
 264         case INDYCAM_CONTROL_BLUE_SATURATION:
 265                 ret = indycam_write_reg(client, INDYCAM_REG_BLUE_SATURATION,
 266                                         ctrl->value);
 267                 break;
 268         case INDYCAM_CONTROL_GAMMA:
 269                 if (camera->version == CAMERA_VERSION_MOOSE) {
 270                         ret = indycam_write_reg(client, INDYCAM_REG_GAMMA,
 271                                                 ctrl->value);
 272                 }
 273                 break;
 274         default:
 275                 ret = -EINVAL;
 276         }
 277
 278         return ret;
 279 }
 280
 281 /* I2C-interface */
 282
 283 static int indycam_attach(struct i2c_adapter *adap, int addr, int kind)
 284 {
 285         int err = 0;
 286         struct indycam *camera;
 287         struct i2c_client *client;
 288
 289         printk(KERN_INFO "SGI IndyCam driver version %s\n",
 290                INDYCAM_MODULE_VERSION);
 291
 292         client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
 293         if (!client)
 294                 return -ENOMEM;
 295         camera = kmalloc(sizeof(struct indycam), GFP_KERNEL);
 296         if (!camera) {
 297                 err = -ENOMEM;
 298                 goto out_free_client;
 299         }
 300
 301         memset(client, 0, sizeof(struct i2c_client));
 302         memset(camera, 0, sizeof(struct indycam));
 303
 304         client->addr = addr;
 305         client->adapter = adap;
 306         client->driver = &i2c_driver_indycam;
 307         client->flags = 0;
 308         strcpy(client->name, "IndyCam client");
 309         i2c_set_clientdata(client, camera);
 310
 311         camera->client = client;
 312
 313         err = i2c_attach_client(client);
 314         if (err)
 315                 goto out_free_camera;
 316
 317         camera->version = i2c_smbus_read_byte_data(client,
 318                                                    INDYCAM_REG_VERSION);
 319         if (camera->version != CAMERA_VERSION_INDY &&
 320             camera->version != CAMERA_VERSION_MOOSE) {
 321                 err = -ENODEV;
 322                 goto out_detach_client;
 323         }
 324         printk(KERN_INFO "IndyCam v%d.%d detected\n",
 325                INDYCAM_VERSION_MAJOR(camera->version),
 326                INDYCAM_VERSION_MINOR(camera->version));
 327
 328         indycam_regdump(client);
 329
 330         // initialize
 331         err = indycam_write_block(client, 0, sizeof(initseq), (u8 *)&initseq);
 332         if (err) {
 333                 printk(KERN_ERR "IndyCam initalization failed\n");
 334                 err = -EIO;
 335                 goto out_detach_client;
 336         }
 337
 338         indycam_regdump(client);
 339
 340         // white balance
 341         err = indycam_write_reg(client, INDYCAM_REG_CONTROL,
 342                           INDYCAM_CONTROL_AGCENA | INDYCAM_CONTROL_AWBCTL);
 343         if (err) {
 344                 printk(KERN_ERR "IndyCam: White balancing camera failed\n");
 345                 err = -EIO;
 346                 goto out_detach_client;
 347         }
 348
 349         indycam_regdump(client);
 350
 351         printk(KERN_INFO "IndyCam initialized\n");
 352
 353         return 0;
 354
 355 out_detach_client:
 356         i2c_detach_client(client);
 357 out_free_camera:
 358         kfree(camera);
 359 out_free_client:
 360         kfree(client);
 361         return err;
 362 }
 363
 364 static int indycam_probe(struct i2c_adapter *adap)
 365 {
 366         /* Indy specific crap */
 367         if (adap->id == I2C_HW_SGI_VINO)
 368                 return indycam_attach(adap, INDYCAM_ADDR, 0);
 369         /* Feel free to add probe here :-) */
 370         return -ENODEV;
 371 }
 372
 373 static int indycam_detach(struct i2c_client *client)
 374 {
 375         struct indycam *camera = i2c_get_clientdata(client);
 376
 377         i2c_detach_client(client);
 378         kfree(camera);
 379         kfree(client);
 380         return 0;
 381 }
 382
 383 static int indycam_command(struct i2c_client *client, unsigned int cmd,
 384                            void *arg)
 385 {
 386         // struct indycam *camera = i2c_get_clientdata(client);
 387
 388         /* The old video_decoder interface just isn't enough,
 389          * so we'll use some custom commands. */
 390         switch (cmd) {
 391         case DECODER_GET_CAPABILITIES: {
 392                 struct video_decoder_capability *cap = arg;
 393
 394                 cap->flags  = VIDEO_DECODER_NTSC;
 395                 cap->inputs = 1;
 396                 cap->outputs = 1;
 397                 break;
 398         }
 399         case DECODER_GET_STATUS: {
 400                 int *iarg = arg;
 401
 402                 *iarg = DECODER_STATUS_GOOD | DECODER_STATUS_NTSC |
 403                         DECODER_STATUS_COLOR;
 404                 break;
 405         }
 406         case DECODER_SET_NORM: {
 407                 int *iarg = arg;
 408
 409                 switch (*iarg) {
 410                 case VIDEO_MODE_NTSC:
 411                         break;
 412                 default:
 413                         return -EINVAL;
 414                 }
 415                 break;
 416         }
 417         case DECODER_SET_INPUT: {
 418                 int *iarg = arg;
 419
 420                 if (*iarg != 0)
 421                         return -EINVAL;
 422                 break;
 423         }
 424         case DECODER_SET_OUTPUT: {
 425                 int *iarg = arg;
 426
 427                 if (*iarg != 0)
 428                         return -EINVAL;
 429                 break;
 430         }
 431         case DECODER_ENABLE_OUTPUT: {
 432                 /* Always enabled */
 433                 break;
 434         }
 435         case DECODER_SET_PICTURE: {
 436                 // struct video_picture *pic = arg;
 437                 /* TODO: convert values for indycam_set_controls() */
 438                 break;
 439         }
 440         case DECODER_INDYCAM_GET_CONTROL: {
 441                 return indycam_get_control(client, arg);
 442         }
 443         case DECODER_INDYCAM_SET_CONTROL: {
 444                 return indycam_set_control(client, arg);
 445         }
 446         default:
 447                 return -EINVAL;
 448         }
 449
 450         return 0;
 451 }
 452
 453 static struct i2c_driver i2c_driver_indycam = {
 454         .owner          = THIS_MODULE,
 455         .name           = "indycam",
 456         .id             = I2C_DRIVERID_INDYCAM,
 457         .flags          = I2C_DF_NOTIFY,
 458         .attach_adapter = indycam_probe,
 459         .detach_client  = indycam_detach,
 460         .command        = indycam_command,
 461 };
 462
 463 static int __init indycam_init(void)
 464 {
 465         return i2c_add_driver(&i2c_driver_indycam);
 466 }
 467
 468 static void __exit indycam_exit(void)
 469 {
 470         i2c_del_driver(&i2c_driver_indycam);
 471 }
 472
 473 module_init(indycam_init);
 474 module_exit(indycam_exit);