kernel/drivers/leds/leds-lm355x.c

   1 /*
   2 * Simple driver for Texas Instruments LM355x LED Flash driver chip
   3 * Copyright (C) 2012 Texas Instruments
   4 *
   5 * This program is free software; you can redistribute it and/or modify
   6 * it under the terms of the GNU General Public License version 2 as
   7 * published by the Free Software Foundation.
   8 */
   9
  10 #include <linux/module.h>
  11 #include <linux/delay.h>
  12 #include <linux/i2c.h>
  13 #include <linux/gpio.h>
  14 #include <linux/leds.h>
  15 #include <linux/slab.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/fs.h>
  18 #include <linux/regmap.h>
  19 #include <linux/workqueue.h>
  20 #include <linux/platform_data/leds-lm355x.h>
  21
  22 enum lm355x_type {
  23         CHIP_LM3554 = 0,
  24         CHIP_LM3556,
  25 };
  26
  27 enum lm355x_regs {
  28         REG_FLAG = 0,
  29         REG_TORCH_CFG,
  30         REG_TORCH_CTRL,
  31         REG_STROBE_CFG,
  32         REG_FLASH_CTRL,
  33         REG_INDI_CFG,
  34         REG_INDI_CTRL,
  35         REG_OPMODE,
  36         REG_MAX,
  37 };
  38
  39 /* operation mode */
  40 enum lm355x_mode {
  41         MODE_SHDN = 0,
  42         MODE_INDIC,
  43         MODE_TORCH,
  44         MODE_FLASH
  45 };
  46
  47 /* register map info. */
  48 struct lm355x_reg_data {
  49         u8 regno;
  50         u8 mask;
  51         u8 shift;
  52 };
  53
  54 struct lm355x_chip_data {
  55         struct device *dev;
  56         enum lm355x_type type;
  57
  58         struct led_classdev cdev_flash;
  59         struct led_classdev cdev_torch;
  60         struct led_classdev cdev_indicator;
  61
  62         struct work_struct work_flash;
  63         struct work_struct work_torch;
  64         struct work_struct work_indicator;
  65
  66         u8 br_flash;
  67         u8 br_torch;
  68         u8 br_indicator;
  69
  70         struct lm355x_platform_data *pdata;
  71         struct regmap *regmap;
  72         struct mutex lock;
  73
  74         unsigned int last_flag;
  75         struct lm355x_reg_data *regs;
  76 };
  77
  78 /* specific indicator function for lm3556 */
  79 enum lm3556_indic_pulse_time {
  80         PULSE_TIME_0_MS = 0,
  81         PULSE_TIME_32_MS,
  82         PULSE_TIME_64_MS,
  83         PULSE_TIME_92_MS,
  84         PULSE_TIME_128_MS,
  85         PULSE_TIME_160_MS,
  86         PULSE_TIME_196_MS,
  87         PULSE_TIME_224_MS,
  88         PULSE_TIME_256_MS,
  89         PULSE_TIME_288_MS,
  90         PULSE_TIME_320_MS,
  91         PULSE_TIME_352_MS,
  92         PULSE_TIME_384_MS,
  93         PULSE_TIME_416_MS,
  94         PULSE_TIME_448_MS,
  95         PULSE_TIME_480_MS,
  96 };
  97
  98 enum lm3556_indic_n_blank {
  99         INDIC_N_BLANK_0 = 0,
 100         INDIC_N_BLANK_1,
 101         INDIC_N_BLANK_2,
 102         INDIC_N_BLANK_3,
 103         INDIC_N_BLANK_4,
 104         INDIC_N_BLANK_5,
 105         INDIC_N_BLANK_6,
 106         INDIC_N_BLANK_7,
 107         INDIC_N_BLANK_8,
 108         INDIC_N_BLANK_9,
 109         INDIC_N_BLANK_10,
 110         INDIC_N_BLANK_11,
 111         INDIC_N_BLANK_12,
 112         INDIC_N_BLANK_13,
 113         INDIC_N_BLANK_14,
 114         INDIC_N_BLANK_15,
 115 };
 116
 117 enum lm3556_indic_period {
 118         INDIC_PERIOD_0 = 0,
 119         INDIC_PERIOD_1,
 120         INDIC_PERIOD_2,
 121         INDIC_PERIOD_3,
 122         INDIC_PERIOD_4,
 123         INDIC_PERIOD_5,
 124         INDIC_PERIOD_6,
 125         INDIC_PERIOD_7,
 126 };
 127
 128 #define INDIC_PATTERN_SIZE 4
 129
 130 struct indicator {
 131         u8 blinking;
 132         u8 period_cnt;
 133 };
 134
 135 /* indicator pattern data only for lm3556 */
 136 static struct indicator indicator_pattern[INDIC_PATTERN_SIZE] = {
 137         [0] = {(INDIC_N_BLANK_1 << 4) | PULSE_TIME_32_MS, INDIC_PERIOD_1},
 138         [1] = {(INDIC_N_BLANK_15 << 4) | PULSE_TIME_32_MS, INDIC_PERIOD_2},
 139         [2] = {(INDIC_N_BLANK_10 << 4) | PULSE_TIME_32_MS, INDIC_PERIOD_4},
 140         [3] = {(INDIC_N_BLANK_5 << 4) | PULSE_TIME_32_MS, INDIC_PERIOD_7},
 141 };
 142
 143 static struct lm355x_reg_data lm3554_regs[REG_MAX] = {
 144         [REG_FLAG] = {0xD0, 0xBF, 0},
 145         [REG_TORCH_CFG] = {0xE0, 0x80, 7},
 146         [REG_TORCH_CTRL] = {0xA0, 0x38, 3},
 147         [REG_STROBE_CFG] = {0xE0, 0x04, 2},
 148         [REG_FLASH_CTRL] = {0xB0, 0x78, 3},
 149         [REG_INDI_CFG] = {0xE0, 0x08, 3},
 150         [REG_INDI_CTRL] = {0xA0, 0xC0, 6},
 151         [REG_OPMODE] = {0xA0, 0x03, 0},
 152 };
 153
 154 static struct lm355x_reg_data lm3556_regs[REG_MAX] = {
 155         [REG_FLAG] = {0x0B, 0xFF, 0},
 156         [REG_TORCH_CFG] = {0x0A, 0x10, 4},
 157         [REG_TORCH_CTRL] = {0x09, 0x70, 4},
 158         [REG_STROBE_CFG] = {0x0A, 0x20, 5},
 159         [REG_FLASH_CTRL] = {0x09, 0x0F, 0},
 160         [REG_INDI_CFG] = {0xFF, 0xFF, 0},
 161         [REG_INDI_CTRL] = {0x09, 0x70, 4},
 162         [REG_OPMODE] = {0x0A, 0x03, 0},
 163 };
 164
 165 static char lm355x_name[][I2C_NAME_SIZE] = {
 166         [CHIP_LM3554] = LM3554_NAME,
 167         [CHIP_LM3556] = LM3556_NAME,
 168 };
 169
 170 /* chip initialize */
 171 static int lm355x_chip_init(struct lm355x_chip_data *chip)
 172 {
 173         int ret;
 174         unsigned int reg_val;
 175         struct lm355x_platform_data *pdata = chip->pdata;
 176
 177         /* input and output pins configuration */
 178         switch (chip->type) {
 179         case CHIP_LM3554:
 180                 reg_val = pdata->pin_tx2 | pdata->ntc_pin;
 181                 ret = regmap_update_bits(chip->regmap, 0xE0, 0x28, reg_val);
 182                 if (ret < 0)
 183                         goto out;
 184                 reg_val = pdata->pass_mode;
 185                 ret = regmap_update_bits(chip->regmap, 0xA0, 0x04, reg_val);
 186                 if (ret < 0)
 187                         goto out;
 188                 break;
 189
 190         case CHIP_LM3556:
 191                 reg_val = pdata->pin_tx2 | pdata->ntc_pin | pdata->pass_mode;
 192                 ret = regmap_update_bits(chip->regmap, 0x0A, 0xC4, reg_val);
 193                 if (ret < 0)
 194                         goto out;
 195                 break;
 196         default:
 197                 return -ENODATA;
 198         }
 199
 200         return ret;
 201 out:
 202         dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
 203         return ret;
 204 }
 205
 206 /* chip control */
 207 static void lm355x_control(struct lm355x_chip_data *chip,
 208                            u8 brightness, enum lm355x_mode opmode)
 209 {
 210         int ret;
 211         unsigned int reg_val;
 212         struct lm355x_platform_data *pdata = chip->pdata;
 213         struct lm355x_reg_data *preg = chip->regs;
 214
 215         ret = regmap_read(chip->regmap, preg[REG_FLAG].regno, &chip->last_flag);
 216         if (ret < 0)
 217                 goto out;
 218         if (chip->last_flag & preg[REG_FLAG].mask)
 219                 dev_info(chip->dev, "%s Last FLAG is 0x%x\n",
 220                          lm355x_name[chip->type],
 221                          chip->last_flag & preg[REG_FLAG].mask);
 222         /* brightness 0 means shutdown */
 223         if (!brightness)
 224                 opmode = MODE_SHDN;
 225
 226         switch (opmode) {
 227         case MODE_TORCH:
 228                 ret =
 229                     regmap_update_bits(chip->regmap, preg[REG_TORCH_CTRL].regno,
 230                                        preg[REG_TORCH_CTRL].mask,
 231                                        (brightness - 1)
 232                                        << preg[REG_TORCH_CTRL].shift);
 233                 if (ret < 0)
 234                         goto out;
 235
 236                 if (pdata->pin_tx1 != LM355x_PIN_TORCH_DISABLE) {
 237                         ret =
 238                             regmap_update_bits(chip->regmap,
 239                                                preg[REG_TORCH_CFG].regno,
 240                                                preg[REG_TORCH_CFG].mask,
 241                                                0x01 <<
 242                                                preg[REG_TORCH_CFG].shift);
 243                         if (ret < 0)
 244                                 goto out;
 245                         opmode = MODE_SHDN;
 246                         dev_info(chip->dev,
 247                                  "torch brt is set - ext. torch pin mode\n");
 248                 }
 249                 break;
 250
 251         case MODE_FLASH:
 252
 253                 ret =
 254                     regmap_update_bits(chip->regmap, preg[REG_FLASH_CTRL].regno,
 255                                        preg[REG_FLASH_CTRL].mask,
 256                                        (brightness - 1)
 257                                        << preg[REG_FLASH_CTRL].shift);
 258                 if (ret < 0)
 259                         goto out;
 260
 261                 if (pdata->pin_strobe != LM355x_PIN_STROBE_DISABLE) {
 262                         if (chip->type == CHIP_LM3554)
 263                                 reg_val = 0x00;
 264                         else
 265                                 reg_val = 0x01;
 266                         ret =
 267                             regmap_update_bits(chip->regmap,
 268                                                preg[REG_STROBE_CFG].regno,
 269                                                preg[REG_STROBE_CFG].mask,
 270                                                reg_val <<
 271                                                preg[REG_STROBE_CFG].shift);
 272                         if (ret < 0)
 273                                 goto out;
 274                         opmode = MODE_SHDN;
 275                         dev_info(chip->dev,
 276                                  "flash brt is set - ext. strobe pin mode\n");
 277                 }
 278                 break;
 279
 280         case MODE_INDIC:
 281                 ret =
 282                     regmap_update_bits(chip->regmap, preg[REG_INDI_CTRL].regno,
 283                                        preg[REG_INDI_CTRL].mask,
 284                                        (brightness - 1)
 285                                        << preg[REG_INDI_CTRL].shift);
 286                 if (ret < 0)
 287                         goto out;
 288
 289                 if (pdata->pin_tx2 != LM355x_PIN_TX_DISABLE) {
 290                         ret =
 291                             regmap_update_bits(chip->regmap,
 292                                                preg[REG_INDI_CFG].regno,
 293                                                preg[REG_INDI_CFG].mask,
 294                                                0x01 <<
 295                                                preg[REG_INDI_CFG].shift);
 296                         if (ret < 0)
 297                                 goto out;
 298                         opmode = MODE_SHDN;
 299                 }
 300                 break;
 301         case MODE_SHDN:
 302                 break;
 303         default:
 304                 return;
 305         }
 306         /* operation mode control */
 307         ret = regmap_update_bits(chip->regmap, preg[REG_OPMODE].regno,
 308                                  preg[REG_OPMODE].mask,
 309                                  opmode << preg[REG_OPMODE].shift);
 310         if (ret < 0)
 311                 goto out;
 312         return;
 313 out:
 314         dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
 315         return;
 316 }
 317
 318 /* torch */
 319 static void lm355x_deferred_torch_brightness_set(struct work_struct *work)
 320 {
 321         struct lm355x_chip_data *chip =
 322             container_of(work, struct lm355x_chip_data, work_torch);
 323
 324         mutex_lock(&chip->lock);
 325         lm355x_control(chip, chip->br_torch, MODE_TORCH);
 326         mutex_unlock(&chip->lock);
 327 }
 328
 329 static void lm355x_torch_brightness_set(struct led_classdev *cdev,
 330                                         enum led_brightness brightness)
 331 {
 332         struct lm355x_chip_data *chip =
 333             container_of(cdev, struct lm355x_chip_data, cdev_torch);
 334
 335         chip->br_torch = brightness;
 336         schedule_work(&chip->work_torch);
 337 }
 338
 339 /* flash */
 340 static void lm355x_deferred_strobe_brightness_set(struct work_struct *work)
 341 {
 342         struct lm355x_chip_data *chip =
 343             container_of(work, struct lm355x_chip_data, work_flash);
 344
 345         mutex_lock(&chip->lock);
 346         lm355x_control(chip, chip->br_flash, MODE_FLASH);
 347         mutex_unlock(&chip->lock);
 348 }
 349
 350 static void lm355x_strobe_brightness_set(struct led_classdev *cdev,
 351                                          enum led_brightness brightness)
 352 {
 353         struct lm355x_chip_data *chip =
 354             container_of(cdev, struct lm355x_chip_data, cdev_flash);
 355
 356         chip->br_flash = brightness;
 357         schedule_work(&chip->work_flash);
 358 }
 359
 360 /* indicator */
 361 static void lm355x_deferred_indicator_brightness_set(struct work_struct *work)
 362 {
 363         struct lm355x_chip_data *chip =
 364             container_of(work, struct lm355x_chip_data, work_indicator);
 365
 366         mutex_lock(&chip->lock);
 367         lm355x_control(chip, chip->br_indicator, MODE_INDIC);
 368         mutex_unlock(&chip->lock);
 369 }
 370
 371 static void lm355x_indicator_brightness_set(struct led_classdev *cdev,
 372                                             enum led_brightness brightness)
 373 {
 374         struct lm355x_chip_data *chip =
 375             container_of(cdev, struct lm355x_chip_data, cdev_indicator);
 376
 377         chip->br_indicator = brightness;
 378         schedule_work(&chip->work_indicator);
 379 }
 380
 381 /* indicator pattern only for lm3556*/
 382 static ssize_t lm3556_indicator_pattern_store(struct device *dev,
 383                                               struct device_attribute *attr,
 384                                               const char *buf, size_t size)
 385 {
 386         ssize_t ret;
 387         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 388         struct lm355x_chip_data *chip =
 389             container_of(led_cdev, struct lm355x_chip_data, cdev_indicator);
 390         unsigned int state;
 391
 392         ret = kstrtouint(buf, 10, &state);
 393         if (ret)
 394                 goto out;
 395         if (state > INDIC_PATTERN_SIZE - 1)
 396                 state = INDIC_PATTERN_SIZE - 1;
 397
 398         ret = regmap_write(chip->regmap, 0x04,
 399                            indicator_pattern[state].blinking);
 400         if (ret < 0)
 401                 goto out;
 402
 403         ret = regmap_write(chip->regmap, 0x05,
 404                            indicator_pattern[state].period_cnt);
 405         if (ret < 0)
 406                 goto out;
 407
 408         return size;
 409 out:
 410         dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
 411         return ret;
 412 }
 413
 414 static DEVICE_ATTR(pattern, S_IWUSR, NULL, lm3556_indicator_pattern_store);
 415
 416 static struct attribute *lm355x_indicator_attrs[] = {
 417         &dev_attr_pattern.attr,
 418         NULL
 419 };
 420 ATTRIBUTE_GROUPS(lm355x_indicator);
 421
 422 static const struct regmap_config lm355x_regmap = {
 423         .reg_bits = 8,
 424         .val_bits = 8,
 425         .max_register = 0xFF,
 426 };
 427
 428 /* module initialize */
 429 static int lm355x_probe(struct i2c_client *client,
 430                                   const struct i2c_device_id *id)
 431 {
 432         struct lm355x_platform_data *pdata = dev_get_platdata(&client->dev);
 433         struct lm355x_chip_data *chip;
 434
 435         int err;
 436
 437         if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
 438                 dev_err(&client->dev, "i2c functionality check fail.\n");
 439                 return -EOPNOTSUPP;
 440         }
 441
 442         if (pdata == NULL) {
 443                 dev_err(&client->dev, "needs Platform Data.\n");
 444                 return -ENODATA;
 445         }
 446
 447         chip = devm_kzalloc(&client->dev,
 448                             sizeof(struct lm355x_chip_data), GFP_KERNEL);
 449         if (!chip)
 450                 return -ENOMEM;
 451
 452         chip->dev = &client->dev;
 453         chip->type = id->driver_data;
 454         switch (id->driver_data) {
 455         case CHIP_LM3554:
 456                 chip->regs = lm3554_regs;
 457                 break;
 458         case CHIP_LM3556:
 459                 chip->regs = lm3556_regs;
 460                 break;
 461         default:
 462                 return -ENOSYS;
 463         }
 464         chip->pdata = pdata;
 465
 466         chip->regmap = devm_regmap_init_i2c(client, &lm355x_regmap);
 467         if (IS_ERR(chip->regmap)) {
 468                 err = PTR_ERR(chip->regmap);
 469                 dev_err(&client->dev,
 470                         "Failed to allocate register map: %d\n", err);
 471                 return err;
 472         }
 473
 474         mutex_init(&chip->lock);
 475         i2c_set_clientdata(client, chip);
 476
 477         err = lm355x_chip_init(chip);
 478         if (err < 0)
 479                 goto err_out;
 480
 481         /* flash */
 482         INIT_WORK(&chip->work_flash, lm355x_deferred_strobe_brightness_set);
 483         chip->cdev_flash.name = "flash";
 484         chip->cdev_flash.max_brightness = 16;
 485         chip->cdev_flash.brightness_set = lm355x_strobe_brightness_set;
 486         chip->cdev_flash.default_trigger = "flash";
 487         err = led_classdev_register((struct device *)
 488                                     &client->dev, &chip->cdev_flash);
 489         if (err < 0)
 490                 goto err_out;
 491         /* torch */
 492         INIT_WORK(&chip->work_torch, lm355x_deferred_torch_brightness_set);
 493         chip->cdev_torch.name = "torch";
 494         chip->cdev_torch.max_brightness = 8;
 495         chip->cdev_torch.brightness_set = lm355x_torch_brightness_set;
 496         chip->cdev_torch.default_trigger = "torch";
 497         err = led_classdev_register((struct device *)
 498                                     &client->dev, &chip->cdev_torch);
 499         if (err < 0)
 500                 goto err_create_torch_file;
 501         /* indicator */
 502         INIT_WORK(&chip->work_indicator,
 503                   lm355x_deferred_indicator_brightness_set);
 504         chip->cdev_indicator.name = "indicator";
 505         if (id->driver_data == CHIP_LM3554)
 506                 chip->cdev_indicator.max_brightness = 4;
 507         else
 508                 chip->cdev_indicator.max_brightness = 8;
 509         chip->cdev_indicator.brightness_set = lm355x_indicator_brightness_set;
 510         /* indicator pattern control only for LM3556 */
 511         if (id->driver_data == CHIP_LM3556)
 512                 chip->cdev_indicator.groups = lm355x_indicator_groups;
 513         err = led_classdev_register((struct device *)
 514                                     &client->dev, &chip->cdev_indicator);
 515         if (err < 0)
 516                 goto err_create_indicator_file;
 517
 518         dev_info(&client->dev, "%s is initialized\n",
 519                  lm355x_name[id->driver_data]);
 520         return 0;
 521
 522 err_create_indicator_file:
 523         led_classdev_unregister(&chip->cdev_torch);
 524 err_create_torch_file:
 525         led_classdev_unregister(&chip->cdev_flash);
 526 err_out:
 527         return err;
 528 }
 529
 530 static int lm355x_remove(struct i2c_client *client)
 531 {
 532         struct lm355x_chip_data *chip = i2c_get_clientdata(client);
 533         struct lm355x_reg_data *preg = chip->regs;
 534
 535         regmap_write(chip->regmap, preg[REG_OPMODE].regno, 0);
 536         led_classdev_unregister(&chip->cdev_indicator);
 537         flush_work(&chip->work_indicator);
 538         led_classdev_unregister(&chip->cdev_torch);
 539         flush_work(&chip->work_torch);
 540         led_classdev_unregister(&chip->cdev_flash);
 541         flush_work(&chip->work_flash);
 542         dev_info(&client->dev, "%s is removed\n", lm355x_name[chip->type]);
 543
 544         return 0;
 545 }
 546
 547 static const struct i2c_device_id lm355x_id[] = {
 548         {LM3554_NAME, CHIP_LM3554},
 549         {LM3556_NAME, CHIP_LM3556},
 550         {}
 551 };
 552
 553 MODULE_DEVICE_TABLE(i2c, lm355x_id);
 554
 555 static struct i2c_driver lm355x_i2c_driver = {
 556         .driver = {
 557                    .name = LM355x_NAME,
 558                    .owner = THIS_MODULE,
 559                    .pm = NULL,
 560                    },
 561         .probe = lm355x_probe,
 562         .remove = lm355x_remove,
 563         .id_table = lm355x_id,
 564 };
 565
 566 module_i2c_driver(lm355x_i2c_driver);
 567
 568 MODULE_DESCRIPTION("Texas Instruments Flash Lighting driver for LM355x");
 569 MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
 570 MODULE_AUTHOR("G.Shark Jeong <gshark.jeong@gmail.com>");
 571 MODULE_LICENSE("GPL v2");