drivers/leds/leds-lm355x.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3 * Simple driver for Texas Instruments LM355x LED Flash driver chip
   4 * Copyright (C) 2012 Texas Instruments
   5 */
   6
   7 #include <linux/module.h>
   8 #include <linux/delay.h>
   9 #include <linux/i2c.h>
  10 #include <linux/gpio.h>
  11 #include <linux/leds.h>
  12 #include <linux/slab.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/fs.h>
  15 #include <linux/regmap.h>
  16 #include <linux/platform_data/leds-lm355x.h>
  17
  18 enum lm355x_type {
  19         CHIP_LM3554 = 0,
  20         CHIP_LM3556,
  21 };
  22
  23 enum lm355x_regs {
  24         REG_FLAG = 0,
  25         REG_TORCH_CFG,
  26         REG_TORCH_CTRL,
  27         REG_STROBE_CFG,
  28         REG_FLASH_CTRL,
  29         REG_INDI_CFG,
  30         REG_INDI_CTRL,
  31         REG_OPMODE,
  32         REG_MAX,
  33 };
  34
  35 /* operation mode */
  36 enum lm355x_mode {
  37         MODE_SHDN = 0,
  38         MODE_INDIC,
  39         MODE_TORCH,
  40         MODE_FLASH
  41 };
  42
  43 /* register map info. */
  44 struct lm355x_reg_data {
  45         u8 regno;
  46         u8 mask;
  47         u8 shift;
  48 };
  49
  50 struct lm355x_chip_data {
  51         struct device *dev;
  52         enum lm355x_type type;
  53
  54         struct led_classdev cdev_flash;
  55         struct led_classdev cdev_torch;
  56         struct led_classdev cdev_indicator;
  57
  58         struct lm355x_platform_data *pdata;
  59         struct regmap *regmap;
  60         struct mutex lock;
  61
  62         unsigned int last_flag;
  63         struct lm355x_reg_data *regs;
  64 };
  65
  66 /* specific indicator function for lm3556 */
  67 enum lm3556_indic_pulse_time {
  68         PULSE_TIME_0_MS = 0,
  69         PULSE_TIME_32_MS,
  70         PULSE_TIME_64_MS,
  71         PULSE_TIME_92_MS,
  72         PULSE_TIME_128_MS,
  73         PULSE_TIME_160_MS,
  74         PULSE_TIME_196_MS,
  75         PULSE_TIME_224_MS,
  76         PULSE_TIME_256_MS,
  77         PULSE_TIME_288_MS,
  78         PULSE_TIME_320_MS,
  79         PULSE_TIME_352_MS,
  80         PULSE_TIME_384_MS,
  81         PULSE_TIME_416_MS,
  82         PULSE_TIME_448_MS,
  83         PULSE_TIME_480_MS,
  84 };
  85
  86 enum lm3556_indic_n_blank {
  87         INDIC_N_BLANK_0 = 0,
  88         INDIC_N_BLANK_1,
  89         INDIC_N_BLANK_2,
  90         INDIC_N_BLANK_3,
  91         INDIC_N_BLANK_4,
  92         INDIC_N_BLANK_5,
  93         INDIC_N_BLANK_6,
  94         INDIC_N_BLANK_7,
  95         INDIC_N_BLANK_8,
  96         INDIC_N_BLANK_9,
  97         INDIC_N_BLANK_10,
  98         INDIC_N_BLANK_11,
  99         INDIC_N_BLANK_12,
 100         INDIC_N_BLANK_13,
 101         INDIC_N_BLANK_14,
 102         INDIC_N_BLANK_15,
 103 };
 104
 105 enum lm3556_indic_period {
 106         INDIC_PERIOD_0 = 0,
 107         INDIC_PERIOD_1,
 108         INDIC_PERIOD_2,
 109         INDIC_PERIOD_3,
 110         INDIC_PERIOD_4,
 111         INDIC_PERIOD_5,
 112         INDIC_PERIOD_6,
 113         INDIC_PERIOD_7,
 114 };
 115
 116 #define INDIC_PATTERN_SIZE 4
 117
 118 struct indicator {
 119         u8 blinking;
 120         u8 period_cnt;
 121 };
 122
 123 /* indicator pattern data only for lm3556 */
 124 static struct indicator indicator_pattern[INDIC_PATTERN_SIZE] = {
 125         [0] = {(INDIC_N_BLANK_1 << 4) | PULSE_TIME_32_MS, INDIC_PERIOD_1},
 126         [1] = {(INDIC_N_BLANK_15 << 4) | PULSE_TIME_32_MS, INDIC_PERIOD_2},
 127         [2] = {(INDIC_N_BLANK_10 << 4) | PULSE_TIME_32_MS, INDIC_PERIOD_4},
 128         [3] = {(INDIC_N_BLANK_5 << 4) | PULSE_TIME_32_MS, INDIC_PERIOD_7},
 129 };
 130
 131 static struct lm355x_reg_data lm3554_regs[REG_MAX] = {
 132         [REG_FLAG] = {0xD0, 0xBF, 0},
 133         [REG_TORCH_CFG] = {0xE0, 0x80, 7},
 134         [REG_TORCH_CTRL] = {0xA0, 0x38, 3},
 135         [REG_STROBE_CFG] = {0xE0, 0x04, 2},
 136         [REG_FLASH_CTRL] = {0xB0, 0x78, 3},
 137         [REG_INDI_CFG] = {0xE0, 0x08, 3},
 138         [REG_INDI_CTRL] = {0xA0, 0xC0, 6},
 139         [REG_OPMODE] = {0xA0, 0x03, 0},
 140 };
 141
 142 static struct lm355x_reg_data lm3556_regs[REG_MAX] = {
 143         [REG_FLAG] = {0x0B, 0xFF, 0},
 144         [REG_TORCH_CFG] = {0x0A, 0x10, 4},
 145         [REG_TORCH_CTRL] = {0x09, 0x70, 4},
 146         [REG_STROBE_CFG] = {0x0A, 0x20, 5},
 147         [REG_FLASH_CTRL] = {0x09, 0x0F, 0},
 148         [REG_INDI_CFG] = {0xFF, 0xFF, 0},
 149         [REG_INDI_CTRL] = {0x09, 0x70, 4},
 150         [REG_OPMODE] = {0x0A, 0x03, 0},
 151 };
 152
 153 static char lm355x_name[][I2C_NAME_SIZE] = {
 154         [CHIP_LM3554] = LM3554_NAME,
 155         [CHIP_LM3556] = LM3556_NAME,
 156 };
 157
 158 /* chip initialize */
 159 static int lm355x_chip_init(struct lm355x_chip_data *chip)
 160 {
 161         int ret;
 162         unsigned int reg_val;
 163         struct lm355x_platform_data *pdata = chip->pdata;
 164
 165         /* input and output pins configuration */
 166         switch (chip->type) {
 167         case CHIP_LM3554:
 168                 reg_val = pdata->pin_tx2 | pdata->ntc_pin;
 169                 ret = regmap_update_bits(chip->regmap, 0xE0, 0x28, reg_val);
 170                 if (ret < 0)
 171                         goto out;
 172                 reg_val = pdata->pass_mode;
 173                 ret = regmap_update_bits(chip->regmap, 0xA0, 0x04, reg_val);
 174                 if (ret < 0)
 175                         goto out;
 176                 break;
 177
 178         case CHIP_LM3556:
 179                 reg_val = pdata->pin_tx2 | pdata->ntc_pin | pdata->pass_mode;
 180                 ret = regmap_update_bits(chip->regmap, 0x0A, 0xC4, reg_val);
 181                 if (ret < 0)
 182                         goto out;
 183                 break;
 184         default:
 185                 return -ENODATA;
 186         }
 187
 188         return ret;
 189 out:
 190         dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
 191         return ret;
 192 }
 193
 194 /* chip control */
 195 static int lm355x_control(struct lm355x_chip_data *chip,
 196                            u8 brightness, enum lm355x_mode opmode)
 197 {
 198         int ret;
 199         unsigned int reg_val;
 200         struct lm355x_platform_data *pdata = chip->pdata;
 201         struct lm355x_reg_data *preg = chip->regs;
 202
 203         ret = regmap_read(chip->regmap, preg[REG_FLAG].regno, &chip->last_flag);
 204         if (ret < 0)
 205                 goto out;
 206         if (chip->last_flag & preg[REG_FLAG].mask)
 207                 dev_info(chip->dev, "%s Last FLAG is 0x%x\n",
 208                          lm355x_name[chip->type],
 209                          chip->last_flag & preg[REG_FLAG].mask);
 210         /* brightness 0 means shutdown */
 211         if (!brightness)
 212                 opmode = MODE_SHDN;
 213
 214         switch (opmode) {
 215         case MODE_TORCH:
 216                 ret =
 217                     regmap_update_bits(chip->regmap, preg[REG_TORCH_CTRL].regno,
 218                                        preg[REG_TORCH_CTRL].mask,
 219                                        (brightness - 1)
 220                                        << preg[REG_TORCH_CTRL].shift);
 221                 if (ret < 0)
 222                         goto out;
 223
 224                 if (pdata->pin_tx1 != LM355x_PIN_TORCH_DISABLE) {
 225                         ret =
 226                             regmap_update_bits(chip->regmap,
 227                                                preg[REG_TORCH_CFG].regno,
 228                                                preg[REG_TORCH_CFG].mask,
 229                                                0x01 <<
 230                                                preg[REG_TORCH_CFG].shift);
 231                         if (ret < 0)
 232                                 goto out;
 233                         opmode = MODE_SHDN;
 234                         dev_info(chip->dev,
 235                                  "torch brt is set - ext. torch pin mode\n");
 236                 }
 237                 break;
 238
 239         case MODE_FLASH:
 240
 241                 ret =
 242                     regmap_update_bits(chip->regmap, preg[REG_FLASH_CTRL].regno,
 243                                        preg[REG_FLASH_CTRL].mask,
 244                                        (brightness - 1)
 245                                        << preg[REG_FLASH_CTRL].shift);
 246                 if (ret < 0)
 247                         goto out;
 248
 249                 if (pdata->pin_strobe != LM355x_PIN_STROBE_DISABLE) {
 250                         if (chip->type == CHIP_LM3554)
 251                                 reg_val = 0x00;
 252                         else
 253                                 reg_val = 0x01;
 254                         ret =
 255                             regmap_update_bits(chip->regmap,
 256                                                preg[REG_STROBE_CFG].regno,
 257                                                preg[REG_STROBE_CFG].mask,
 258                                                reg_val <<
 259                                                preg[REG_STROBE_CFG].shift);
 260                         if (ret < 0)
 261                                 goto out;
 262                         opmode = MODE_SHDN;
 263                         dev_info(chip->dev,
 264                                  "flash brt is set - ext. strobe pin mode\n");
 265                 }
 266                 break;
 267
 268         case MODE_INDIC:
 269                 ret =
 270                     regmap_update_bits(chip->regmap, preg[REG_INDI_CTRL].regno,
 271                                        preg[REG_INDI_CTRL].mask,
 272                                        (brightness - 1)
 273                                        << preg[REG_INDI_CTRL].shift);
 274                 if (ret < 0)
 275                         goto out;
 276
 277                 if (pdata->pin_tx2 != LM355x_PIN_TX_DISABLE) {
 278                         ret =
 279                             regmap_update_bits(chip->regmap,
 280                                                preg[REG_INDI_CFG].regno,
 281                                                preg[REG_INDI_CFG].mask,
 282                                                0x01 <<
 283                                                preg[REG_INDI_CFG].shift);
 284                         if (ret < 0)
 285                                 goto out;
 286                         opmode = MODE_SHDN;
 287                 }
 288                 break;
 289         case MODE_SHDN:
 290                 break;
 291         default:
 292                 return -EINVAL;
 293         }
 294         /* operation mode control */
 295         ret = regmap_update_bits(chip->regmap, preg[REG_OPMODE].regno,
 296                                  preg[REG_OPMODE].mask,
 297                                  opmode << preg[REG_OPMODE].shift);
 298         if (ret < 0)
 299                 goto out;
 300         return ret;
 301 out:
 302         dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
 303         return ret;
 304 }
 305
 306 /* torch */
 307
 308 static int lm355x_torch_brightness_set(struct led_classdev *cdev,
 309                                         enum led_brightness brightness)
 310 {
 311         struct lm355x_chip_data *chip =
 312             container_of(cdev, struct lm355x_chip_data, cdev_torch);
 313         int ret;
 314
 315         mutex_lock(&chip->lock);
 316         ret = lm355x_control(chip, brightness, MODE_TORCH);
 317         mutex_unlock(&chip->lock);
 318         return ret;
 319 }
 320
 321 /* flash */
 322
 323 static int lm355x_strobe_brightness_set(struct led_classdev *cdev,
 324                                          enum led_brightness brightness)
 325 {
 326         struct lm355x_chip_data *chip =
 327             container_of(cdev, struct lm355x_chip_data, cdev_flash);
 328         int ret;
 329
 330         mutex_lock(&chip->lock);
 331         ret = lm355x_control(chip, brightness, MODE_FLASH);
 332         mutex_unlock(&chip->lock);
 333         return ret;
 334 }
 335
 336 /* indicator */
 337
 338 static int lm355x_indicator_brightness_set(struct led_classdev *cdev,
 339                                             enum led_brightness brightness)
 340 {
 341         struct lm355x_chip_data *chip =
 342             container_of(cdev, struct lm355x_chip_data, cdev_indicator);
 343         int ret;
 344
 345         mutex_lock(&chip->lock);
 346         ret = lm355x_control(chip, brightness, MODE_INDIC);
 347         mutex_unlock(&chip->lock);
 348         return ret;
 349 }
 350
 351 /* indicator pattern only for lm3556*/
 352 static ssize_t lm3556_indicator_pattern_store(struct device *dev,
 353                                               struct device_attribute *attr,
 354                                               const char *buf, size_t size)
 355 {
 356         ssize_t ret;
 357         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 358         struct lm355x_chip_data *chip =
 359             container_of(led_cdev, struct lm355x_chip_data, cdev_indicator);
 360         unsigned int state;
 361
 362         ret = kstrtouint(buf, 10, &state);
 363         if (ret)
 364                 goto out;
 365         if (state > INDIC_PATTERN_SIZE - 1)
 366                 state = INDIC_PATTERN_SIZE - 1;
 367
 368         ret = regmap_write(chip->regmap, 0x04,
 369                            indicator_pattern[state].blinking);
 370         if (ret < 0)
 371                 goto out;
 372
 373         ret = regmap_write(chip->regmap, 0x05,
 374                            indicator_pattern[state].period_cnt);
 375         if (ret < 0)
 376                 goto out;
 377
 378         return size;
 379 out:
 380         dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
 381         return ret;
 382 }
 383
 384 static DEVICE_ATTR(pattern, S_IWUSR, NULL, lm3556_indicator_pattern_store);
 385
 386 static struct attribute *lm355x_indicator_attrs[] = {
 387         &dev_attr_pattern.attr,
 388         NULL
 389 };
 390 ATTRIBUTE_GROUPS(lm355x_indicator);
 391
 392 static const struct regmap_config lm355x_regmap = {
 393         .reg_bits = 8,
 394         .val_bits = 8,
 395         .max_register = 0xFF,
 396 };
 397
 398 /* module initialize */
 399 static int lm355x_probe(struct i2c_client *client,
 400                                   const struct i2c_device_id *id)
 401 {
 402         struct lm355x_platform_data *pdata = dev_get_platdata(&client->dev);
 403         struct lm355x_chip_data *chip;
 404
 405         int err;
 406
 407         if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
 408                 dev_err(&client->dev, "i2c functionality check fail.\n");
 409                 return -EOPNOTSUPP;
 410         }
 411
 412         if (pdata == NULL) {
 413                 dev_err(&client->dev, "needs Platform Data.\n");
 414                 return -ENODATA;
 415         }
 416
 417         chip = devm_kzalloc(&client->dev,
 418                             sizeof(struct lm355x_chip_data), GFP_KERNEL);
 419         if (!chip)
 420                 return -ENOMEM;
 421
 422         chip->dev = &client->dev;
 423         chip->type = id->driver_data;
 424         switch (id->driver_data) {
 425         case CHIP_LM3554:
 426                 chip->regs = lm3554_regs;
 427                 break;
 428         case CHIP_LM3556:
 429                 chip->regs = lm3556_regs;
 430                 break;
 431         default:
 432                 return -ENOSYS;
 433         }
 434         chip->pdata = pdata;
 435
 436         chip->regmap = devm_regmap_init_i2c(client, &lm355x_regmap);
 437         if (IS_ERR(chip->regmap)) {
 438                 err = PTR_ERR(chip->regmap);
 439                 dev_err(&client->dev,
 440                         "Failed to allocate register map: %d\n", err);
 441                 return err;
 442         }
 443
 444         mutex_init(&chip->lock);
 445         i2c_set_clientdata(client, chip);
 446
 447         err = lm355x_chip_init(chip);
 448         if (err < 0)
 449                 goto err_out;
 450
 451         /* flash */
 452         chip->cdev_flash.name = "flash";
 453         chip->cdev_flash.max_brightness = 16;
 454         chip->cdev_flash.brightness_set_blocking = lm355x_strobe_brightness_set;
 455         chip->cdev_flash.default_trigger = "flash";
 456         err = led_classdev_register((struct device *)
 457                                     &client->dev, &chip->cdev_flash);
 458         if (err < 0)
 459                 goto err_out;
 460         /* torch */
 461         chip->cdev_torch.name = "torch";
 462         chip->cdev_torch.max_brightness = 8;
 463         chip->cdev_torch.brightness_set_blocking = lm355x_torch_brightness_set;
 464         chip->cdev_torch.default_trigger = "torch";
 465         err = led_classdev_register((struct device *)
 466                                     &client->dev, &chip->cdev_torch);
 467         if (err < 0)
 468                 goto err_create_torch_file;
 469         /* indicator */
 470         chip->cdev_indicator.name = "indicator";
 471         if (id->driver_data == CHIP_LM3554)
 472                 chip->cdev_indicator.max_brightness = 4;
 473         else
 474                 chip->cdev_indicator.max_brightness = 8;
 475         chip->cdev_indicator.brightness_set_blocking =
 476                                         lm355x_indicator_brightness_set;
 477         /* indicator pattern control only for LM3556 */
 478         if (id->driver_data == CHIP_LM3556)
 479                 chip->cdev_indicator.groups = lm355x_indicator_groups;
 480         err = led_classdev_register((struct device *)
 481                                     &client->dev, &chip->cdev_indicator);
 482         if (err < 0)
 483                 goto err_create_indicator_file;
 484
 485         dev_info(&client->dev, "%s is initialized\n",
 486                  lm355x_name[id->driver_data]);
 487         return 0;
 488
 489 err_create_indicator_file:
 490         led_classdev_unregister(&chip->cdev_torch);
 491 err_create_torch_file:
 492         led_classdev_unregister(&chip->cdev_flash);
 493 err_out:
 494         return err;
 495 }
 496
 497 static int lm355x_remove(struct i2c_client *client)
 498 {
 499         struct lm355x_chip_data *chip = i2c_get_clientdata(client);
 500         struct lm355x_reg_data *preg = chip->regs;
 501
 502         regmap_write(chip->regmap, preg[REG_OPMODE].regno, 0);
 503         led_classdev_unregister(&chip->cdev_indicator);
 504         led_classdev_unregister(&chip->cdev_torch);
 505         led_classdev_unregister(&chip->cdev_flash);
 506         dev_info(&client->dev, "%s is removed\n", lm355x_name[chip->type]);
 507
 508         return 0;
 509 }
 510
 511 static const struct i2c_device_id lm355x_id[] = {
 512         {LM3554_NAME, CHIP_LM3554},
 513         {LM3556_NAME, CHIP_LM3556},
 514         {}
 515 };
 516
 517 MODULE_DEVICE_TABLE(i2c, lm355x_id);
 518
 519 static struct i2c_driver lm355x_i2c_driver = {
 520         .driver = {
 521                    .name = LM355x_NAME,
 522                    .pm = NULL,
 523                    },
 524         .probe = lm355x_probe,
 525         .remove = lm355x_remove,
 526         .id_table = lm355x_id,
 527 };
 528
 529 module_i2c_driver(lm355x_i2c_driver);
 530
 531 MODULE_DESCRIPTION("Texas Instruments Flash Lighting driver for LM355x");
 532 MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
 533 MODULE_AUTHOR("G.Shark Jeong <gshark.jeong@gmail.com>");
 534 MODULE_LICENSE("GPL v2");