| 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, ®); |
| 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, ®); |
| 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, ®); |
| 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, ®); |
| 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, ®); |
| 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, ®); |
| 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, ®); |
| 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, ®); |
| 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, ®); |
| 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); |