kernel/drivers/media/i2c/lm3560.c

   1 /*
   2  * drivers/media/i2c/lm3560.c
   3  * General device driver for TI lm3560, FLASH LED Driver
   4  *
   5  * Copyright (C) 2013 Texas Instruments
   6  *
   7  * Contact: Daniel Jeong <gshark.jeong@gmail.com>
   8  *                      Ldd-Mlp <ldd-mlp@list.ti.com>
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License
  12  * version 2 as published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  */
  19
  20 #include <linux/delay.h>
  21 #include <linux/module.h>
  22 #include <linux/i2c.h>
  23 #include <linux/slab.h>
  24 #include <linux/mutex.h>
  25 #include <linux/regmap.h>
  26 #include <linux/videodev2.h>
  27 #include <media/lm3560.h>
  28 #include <media/v4l2-ctrls.h>
  29 #include <media/v4l2-device.h>
  30
  31 /* registers definitions */
  32 #define REG_ENABLE              0x10
  33 #define REG_TORCH_BR    0xa0
  34 #define REG_FLASH_BR    0xb0
  35 #define REG_FLASH_TOUT  0xc0
  36 #define REG_FLAG                0xd0
  37 #define REG_CONFIG1             0xe0
  38
  39 /* fault mask */
  40 #define FAULT_TIMEOUT   (1<<0)
  41 #define FAULT_OVERTEMP  (1<<1)
  42 #define FAULT_SHORT_CIRCUIT     (1<<2)
  43
  44 enum led_enable {
  45         MODE_SHDN = 0x0,
  46         MODE_TORCH = 0x2,
  47         MODE_FLASH = 0x3,
  48 };
  49
  50 /**
  51  * struct lm3560_flash
  52  *
  53  * @pdata: platform data
  54  * @regmap: reg. map for i2c
  55  * @lock: muxtex for serial access.
  56  * @led_mode: V4L2 LED mode
  57  * @ctrls_led: V4L2 contols
  58  * @subdev_led: V4L2 subdev
  59  */
  60 struct lm3560_flash {
  61         struct device *dev;
  62         struct lm3560_platform_data *pdata;
  63         struct regmap *regmap;
  64         struct mutex lock;
  65
  66         enum v4l2_flash_led_mode led_mode;
  67         struct v4l2_ctrl_handler ctrls_led[LM3560_LED_MAX];
  68         struct v4l2_subdev subdev_led[LM3560_LED_MAX];
  69 };
  70
  71 #define to_lm3560_flash(_ctrl, _no)     \
  72         container_of(_ctrl->handler, struct lm3560_flash, ctrls_led[_no])
  73
  74 /* enable mode control */
  75 static int lm3560_mode_ctrl(struct lm3560_flash *flash)
  76 {
  77         int rval = -EINVAL;
  78
  79         switch (flash->led_mode) {
  80         case V4L2_FLASH_LED_MODE_NONE:
  81                 rval = regmap_update_bits(flash->regmap,
  82                                           REG_ENABLE, 0x03, MODE_SHDN);
  83                 break;
  84         case V4L2_FLASH_LED_MODE_TORCH:
  85                 rval = regmap_update_bits(flash->regmap,
  86                                           REG_ENABLE, 0x03, MODE_TORCH);
  87                 break;
  88         case V4L2_FLASH_LED_MODE_FLASH:
  89                 rval = regmap_update_bits(flash->regmap,
  90                                           REG_ENABLE, 0x03, MODE_FLASH);
  91                 break;
  92         }
  93         return rval;
  94 }
  95
  96 /* led1/2 enable/disable */
  97 static int lm3560_enable_ctrl(struct lm3560_flash *flash,
  98                               enum lm3560_led_id led_no, bool on)
  99 {
 100         int rval;
 101
 102         if (led_no == LM3560_LED0) {
 103                 if (on)
 104                         rval = regmap_update_bits(flash->regmap,
 105                                                   REG_ENABLE, 0x08, 0x08);
 106                 else
 107                         rval = regmap_update_bits(flash->regmap,
 108                                                   REG_ENABLE, 0x08, 0x00);
 109         } else {
 110                 if (on)
 111                         rval = regmap_update_bits(flash->regmap,
 112                                                   REG_ENABLE, 0x10, 0x10);
 113                 else
 114                         rval = regmap_update_bits(flash->regmap,
 115                                                   REG_ENABLE, 0x10, 0x00);
 116         }
 117         return rval;
 118 }
 119
 120 /* torch1/2 brightness control */
 121 static int lm3560_torch_brt_ctrl(struct lm3560_flash *flash,
 122                                  enum lm3560_led_id led_no, unsigned int brt)
 123 {
 124         int rval;
 125         u8 br_bits;
 126
 127         if (brt < LM3560_TORCH_BRT_MIN)
 128                 return lm3560_enable_ctrl(flash, led_no, false);
 129         else
 130                 rval = lm3560_enable_ctrl(flash, led_no, true);
 131
 132         br_bits = LM3560_TORCH_BRT_uA_TO_REG(brt);
 133         if (led_no == LM3560_LED0)
 134                 rval = regmap_update_bits(flash->regmap,
 135                                           REG_TORCH_BR, 0x07, br_bits);
 136         else
 137                 rval = regmap_update_bits(flash->regmap,
 138                                           REG_TORCH_BR, 0x38, br_bits << 3);
 139
 140         return rval;
 141 }
 142
 143 /* flash1/2 brightness control */
 144 static int lm3560_flash_brt_ctrl(struct lm3560_flash *flash,
 145                                  enum lm3560_led_id led_no, unsigned int brt)
 146 {
 147         int rval;
 148         u8 br_bits;
 149
 150         if (brt < LM3560_FLASH_BRT_MIN)
 151                 return lm3560_enable_ctrl(flash, led_no, false);
 152         else
 153                 rval = lm3560_enable_ctrl(flash, led_no, true);
 154
 155         br_bits = LM3560_FLASH_BRT_uA_TO_REG(brt);
 156         if (led_no == LM3560_LED0)
 157                 rval = regmap_update_bits(flash->regmap,
 158                                           REG_FLASH_BR, 0x0f, br_bits);
 159         else
 160                 rval = regmap_update_bits(flash->regmap,
 161                                           REG_FLASH_BR, 0xf0, br_bits << 4);
 162
 163         return rval;
 164 }
 165
 166 /* v4l2 controls  */
 167 static int lm3560_get_ctrl(struct v4l2_ctrl *ctrl, enum lm3560_led_id led_no)
 168 {
 169         struct lm3560_flash *flash = to_lm3560_flash(ctrl, led_no);
 170         int rval = -EINVAL;
 171
 172         mutex_lock(&flash->lock);
 173
 174         if (ctrl->id == V4L2_CID_FLASH_FAULT) {
 175                 s32 fault = 0;
 176                 unsigned int reg_val;
 177                 rval = regmap_read(flash->regmap, REG_FLAG, &reg_val);
 178                 if (rval < 0)
 179                         goto out;
 180                 if (reg_val & FAULT_SHORT_CIRCUIT)
 181                         fault |= V4L2_FLASH_FAULT_SHORT_CIRCUIT;
 182                 if (reg_val & FAULT_OVERTEMP)
 183                         fault |= V4L2_FLASH_FAULT_OVER_TEMPERATURE;
 184                 if (reg_val & FAULT_TIMEOUT)
 185                         fault |= V4L2_FLASH_FAULT_TIMEOUT;
 186                 ctrl->cur.val = fault;
 187         }
 188
 189 out:
 190         mutex_unlock(&flash->lock);
 191         return rval;
 192 }
 193
 194 static int lm3560_set_ctrl(struct v4l2_ctrl *ctrl, enum lm3560_led_id led_no)
 195 {
 196         struct lm3560_flash *flash = to_lm3560_flash(ctrl, led_no);
 197         u8 tout_bits;
 198         int rval = -EINVAL;
 199
 200         mutex_lock(&flash->lock);
 201
 202         switch (ctrl->id) {
 203         case V4L2_CID_FLASH_LED_MODE:
 204                 flash->led_mode = ctrl->val;
 205                 if (flash->led_mode != V4L2_FLASH_LED_MODE_FLASH)
 206                         rval = lm3560_mode_ctrl(flash);
 207                 break;
 208
 209         case V4L2_CID_FLASH_STROBE_SOURCE:
 210                 rval = regmap_update_bits(flash->regmap,
 211                                           REG_CONFIG1, 0x04, (ctrl->val) << 2);
 212                 if (rval < 0)
 213                         goto err_out;
 214                 break;
 215
 216         case V4L2_CID_FLASH_STROBE:
 217                 if (flash->led_mode != V4L2_FLASH_LED_MODE_FLASH) {
 218                         rval = -EBUSY;
 219                         goto err_out;
 220                 }
 221                 flash->led_mode = V4L2_FLASH_LED_MODE_FLASH;
 222                 rval = lm3560_mode_ctrl(flash);
 223                 break;
 224
 225         case V4L2_CID_FLASH_STROBE_STOP:
 226                 if (flash->led_mode != V4L2_FLASH_LED_MODE_FLASH) {
 227                         rval = -EBUSY;
 228                         goto err_out;
 229                 }
 230                 flash->led_mode = V4L2_FLASH_LED_MODE_NONE;
 231                 rval = lm3560_mode_ctrl(flash);
 232                 break;
 233
 234         case V4L2_CID_FLASH_TIMEOUT:
 235                 tout_bits = LM3560_FLASH_TOUT_ms_TO_REG(ctrl->val);
 236                 rval = regmap_update_bits(flash->regmap,
 237                                           REG_FLASH_TOUT, 0x1f, tout_bits);
 238                 break;
 239
 240         case V4L2_CID_FLASH_INTENSITY:
 241                 rval = lm3560_flash_brt_ctrl(flash, led_no, ctrl->val);
 242                 break;
 243
 244         case V4L2_CID_FLASH_TORCH_INTENSITY:
 245                 rval = lm3560_torch_brt_ctrl(flash, led_no, ctrl->val);
 246                 break;
 247         }
 248
 249 err_out:
 250         mutex_unlock(&flash->lock);
 251         return rval;
 252 }
 253
 254 static int lm3560_led1_get_ctrl(struct v4l2_ctrl *ctrl)
 255 {
 256         return lm3560_get_ctrl(ctrl, LM3560_LED1);
 257 }
 258
 259 static int lm3560_led1_set_ctrl(struct v4l2_ctrl *ctrl)
 260 {
 261         return lm3560_set_ctrl(ctrl, LM3560_LED1);
 262 }
 263
 264 static int lm3560_led0_get_ctrl(struct v4l2_ctrl *ctrl)
 265 {
 266         return lm3560_get_ctrl(ctrl, LM3560_LED0);
 267 }
 268
 269 static int lm3560_led0_set_ctrl(struct v4l2_ctrl *ctrl)
 270 {
 271         return lm3560_set_ctrl(ctrl, LM3560_LED0);
 272 }
 273
 274 static const struct v4l2_ctrl_ops lm3560_led_ctrl_ops[LM3560_LED_MAX] = {
 275         [LM3560_LED0] = {
 276                          .g_volatile_ctrl = lm3560_led0_get_ctrl,
 277                          .s_ctrl = lm3560_led0_set_ctrl,
 278                          },
 279         [LM3560_LED1] = {
 280                          .g_volatile_ctrl = lm3560_led1_get_ctrl,
 281                          .s_ctrl = lm3560_led1_set_ctrl,
 282                          }
 283 };
 284
 285 static int lm3560_init_controls(struct lm3560_flash *flash,
 286                                 enum lm3560_led_id led_no)
 287 {
 288         struct v4l2_ctrl *fault;
 289         u32 max_flash_brt = flash->pdata->max_flash_brt[led_no];
 290         u32 max_torch_brt = flash->pdata->max_torch_brt[led_no];
 291         struct v4l2_ctrl_handler *hdl = &flash->ctrls_led[led_no];
 292         const struct v4l2_ctrl_ops *ops = &lm3560_led_ctrl_ops[led_no];
 293
 294         v4l2_ctrl_handler_init(hdl, 8);
 295
 296         /* flash mode */
 297         v4l2_ctrl_new_std_menu(hdl, ops, V4L2_CID_FLASH_LED_MODE,
 298                                V4L2_FLASH_LED_MODE_TORCH, ~0x7,
 299                                V4L2_FLASH_LED_MODE_NONE);
 300         flash->led_mode = V4L2_FLASH_LED_MODE_NONE;
 301
 302         /* flash source */
 303         v4l2_ctrl_new_std_menu(hdl, ops, V4L2_CID_FLASH_STROBE_SOURCE,
 304                                0x1, ~0x3, V4L2_FLASH_STROBE_SOURCE_SOFTWARE);
 305
 306         /* flash strobe */
 307         v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_STROBE, 0, 0, 0, 0);
 308
 309         /* flash strobe stop */
 310         v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_STROBE_STOP, 0, 0, 0, 0);
 311
 312         /* flash strobe timeout */
 313         v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_TIMEOUT,
 314                           LM3560_FLASH_TOUT_MIN,
 315                           flash->pdata->max_flash_timeout,
 316                           LM3560_FLASH_TOUT_STEP,
 317                           flash->pdata->max_flash_timeout);
 318
 319         /* flash brt */
 320         v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_INTENSITY,
 321                           LM3560_FLASH_BRT_MIN, max_flash_brt,
 322                           LM3560_FLASH_BRT_STEP, max_flash_brt);
 323
 324         /* torch brt */
 325         v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_TORCH_INTENSITY,
 326                           LM3560_TORCH_BRT_MIN, max_torch_brt,
 327                           LM3560_TORCH_BRT_STEP, max_torch_brt);
 328
 329         /* fault */
 330         fault = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_FAULT, 0,
 331                                   V4L2_FLASH_FAULT_OVER_VOLTAGE
 332                                   | V4L2_FLASH_FAULT_OVER_TEMPERATURE
 333                                   | V4L2_FLASH_FAULT_SHORT_CIRCUIT
 334                                   | V4L2_FLASH_FAULT_TIMEOUT, 0, 0);
 335         if (fault != NULL)
 336                 fault->flags |= V4L2_CTRL_FLAG_VOLATILE;
 337
 338         if (hdl->error)
 339                 return hdl->error;
 340
 341         flash->subdev_led[led_no].ctrl_handler = hdl;
 342         return 0;
 343 }
 344
 345 /* initialize device */
 346 static const struct v4l2_subdev_ops lm3560_ops = {
 347         .core = NULL,
 348 };
 349
 350 static const struct regmap_config lm3560_regmap = {
 351         .reg_bits = 8,
 352         .val_bits = 8,
 353         .max_register = 0xFF,
 354 };
 355
 356 static int lm3560_subdev_init(struct lm3560_flash *flash,
 357                               enum lm3560_led_id led_no, char *led_name)
 358 {
 359         struct i2c_client *client = to_i2c_client(flash->dev);
 360         int rval;
 361
 362         v4l2_i2c_subdev_init(&flash->subdev_led[led_no], client, &lm3560_ops);
 363         flash->subdev_led[led_no].flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
 364         strcpy(flash->subdev_led[led_no].name, led_name);
 365         rval = lm3560_init_controls(flash, led_no);
 366         if (rval)
 367                 goto err_out;
 368         rval = media_entity_init(&flash->subdev_led[led_no].entity, 0, NULL, 0);
 369         if (rval < 0)
 370                 goto err_out;
 371         flash->subdev_led[led_no].entity.type = MEDIA_ENT_T_V4L2_SUBDEV_FLASH;
 372
 373         return rval;
 374
 375 err_out:
 376         v4l2_ctrl_handler_free(&flash->ctrls_led[led_no]);
 377         return rval;
 378 }
 379
 380 static int lm3560_init_device(struct lm3560_flash *flash)
 381 {
 382         int rval;
 383         unsigned int reg_val;
 384
 385         /* set peak current */
 386         rval = regmap_update_bits(flash->regmap,
 387                                   REG_FLASH_TOUT, 0x60, flash->pdata->peak);
 388         if (rval < 0)
 389                 return rval;
 390         /* output disable */
 391         flash->led_mode = V4L2_FLASH_LED_MODE_NONE;
 392         rval = lm3560_mode_ctrl(flash);
 393         if (rval < 0)
 394                 return rval;
 395         /* reset faults */
 396         rval = regmap_read(flash->regmap, REG_FLAG, &reg_val);
 397         return rval;
 398 }
 399
 400 static int lm3560_probe(struct i2c_client *client,
 401                         const struct i2c_device_id *devid)
 402 {
 403         struct lm3560_flash *flash;
 404         struct lm3560_platform_data *pdata = dev_get_platdata(&client->dev);
 405         int rval;
 406
 407         flash = devm_kzalloc(&client->dev, sizeof(*flash), GFP_KERNEL);
 408         if (flash == NULL)
 409                 return -ENOMEM;
 410
 411         flash->regmap = devm_regmap_init_i2c(client, &lm3560_regmap);
 412         if (IS_ERR(flash->regmap)) {
 413                 rval = PTR_ERR(flash->regmap);
 414                 return rval;
 415         }
 416
 417         /* if there is no platform data, use chip default value */
 418         if (pdata == NULL) {
 419                 pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL);
 420                 if (pdata == NULL)
 421                         return -ENODEV;
 422                 pdata->peak = LM3560_PEAK_3600mA;
 423                 pdata->max_flash_timeout = LM3560_FLASH_TOUT_MAX;
 424                 /* led 1 */
 425                 pdata->max_flash_brt[LM3560_LED0] = LM3560_FLASH_BRT_MAX;
 426                 pdata->max_torch_brt[LM3560_LED0] = LM3560_TORCH_BRT_MAX;
 427                 /* led 2 */
 428                 pdata->max_flash_brt[LM3560_LED1] = LM3560_FLASH_BRT_MAX;
 429                 pdata->max_torch_brt[LM3560_LED1] = LM3560_TORCH_BRT_MAX;
 430         }
 431         flash->pdata = pdata;
 432         flash->dev = &client->dev;
 433         mutex_init(&flash->lock);
 434
 435         rval = lm3560_subdev_init(flash, LM3560_LED0, "lm3560-led0");
 436         if (rval < 0)
 437                 return rval;
 438
 439         rval = lm3560_subdev_init(flash, LM3560_LED1, "lm3560-led1");
 440         if (rval < 0)
 441                 return rval;
 442
 443         rval = lm3560_init_device(flash);
 444         if (rval < 0)
 445                 return rval;
 446
 447         i2c_set_clientdata(client, flash);
 448
 449         return 0;
 450 }
 451
 452 static int lm3560_remove(struct i2c_client *client)
 453 {
 454         struct lm3560_flash *flash = i2c_get_clientdata(client);
 455         unsigned int i;
 456
 457         for (i = LM3560_LED0; i < LM3560_LED_MAX; i++) {
 458                 v4l2_device_unregister_subdev(&flash->subdev_led[i]);
 459                 v4l2_ctrl_handler_free(&flash->ctrls_led[i]);
 460                 media_entity_cleanup(&flash->subdev_led[i].entity);
 461         }
 462
 463         return 0;
 464 }
 465
 466 static const struct i2c_device_id lm3560_id_table[] = {
 467         {LM3560_NAME, 0},
 468         {}
 469 };
 470
 471 MODULE_DEVICE_TABLE(i2c, lm3560_id_table);
 472
 473 static struct i2c_driver lm3560_i2c_driver = {
 474         .driver = {
 475                    .name = LM3560_NAME,
 476                    .pm = NULL,
 477                    },
 478         .probe = lm3560_probe,
 479         .remove = lm3560_remove,
 480         .id_table = lm3560_id_table,
 481 };
 482
 483 module_i2c_driver(lm3560_i2c_driver);
 484
 485 MODULE_AUTHOR("Daniel Jeong <gshark.jeong@gmail.com>");
 486 MODULE_AUTHOR("Ldd Mlp <ldd-mlp@list.ti.com>");
 487 MODULE_DESCRIPTION("Texas Instruments LM3560 LED flash driver");
 488 MODULE_LICENSE("GPL");