drivers/leds/leds-lp5521.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * LP5521 LED chip driver.
   4  *
   5  * Copyright (C) 2010 Nokia Corporation
   6  * Copyright (C) 2012 Texas Instruments
   7  *
   8  * Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
   9  *          Milo(Woogyom) Kim <milo.kim@ti.com>
  10  */
  11
  12 #include <linux/delay.h>
  13 #include <linux/firmware.h>
  14 #include <linux/i2c.h>
  15 #include <linux/leds.h>
  16 #include <linux/module.h>
  17 #include <linux/mutex.h>
  18 #include <linux/platform_data/leds-lp55xx.h>
  19 #include <linux/slab.h>
  20 #include <linux/of.h>
  21
  22 #include "leds-lp55xx-common.h"
  23
  24 #define LP5521_PROGRAM_LENGTH           32
  25 #define LP5521_MAX_LEDS                 3
  26 #define LP5521_CMD_DIRECT               0x3F
  27
  28 /* Registers */
  29 #define LP5521_REG_ENABLE               0x00
  30 #define LP5521_REG_OP_MODE              0x01
  31 #define LP5521_REG_R_PWM                0x02
  32 #define LP5521_REG_G_PWM                0x03
  33 #define LP5521_REG_B_PWM                0x04
  34 #define LP5521_REG_R_CURRENT            0x05
  35 #define LP5521_REG_G_CURRENT            0x06
  36 #define LP5521_REG_B_CURRENT            0x07
  37 #define LP5521_REG_CONFIG               0x08
  38 #define LP5521_REG_STATUS               0x0C
  39 #define LP5521_REG_RESET                0x0D
  40 #define LP5521_REG_R_PROG_MEM           0x10
  41 #define LP5521_REG_G_PROG_MEM           0x30
  42 #define LP5521_REG_B_PROG_MEM           0x50
  43
  44 /* Base register to set LED current */
  45 #define LP5521_REG_LED_CURRENT_BASE     LP5521_REG_R_CURRENT
  46 /* Base register to set the brightness */
  47 #define LP5521_REG_LED_PWM_BASE         LP5521_REG_R_PWM
  48
  49 /* Bits in ENABLE register */
  50 #define LP5521_MASTER_ENABLE            0x40    /* Chip master enable */
  51 #define LP5521_LOGARITHMIC_PWM          0x80    /* Logarithmic PWM adjustment */
  52 #define LP5521_EXEC_RUN                 0x2A
  53 #define LP5521_ENABLE_DEFAULT   \
  54         (LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM)
  55 #define LP5521_ENABLE_RUN_PROGRAM       \
  56         (LP5521_ENABLE_DEFAULT | LP5521_EXEC_RUN)
  57
  58 /* CONFIG register */
  59 #define LP5521_PWM_HF                   0x40    /* PWM: 0 = 256Hz, 1 = 558Hz */
  60 #define LP5521_PWRSAVE_EN               0x20    /* 1 = Power save mode */
  61 #define LP5521_CP_MODE_OFF              0       /* Charge pump (CP) off */
  62 #define LP5521_CP_MODE_BYPASS           8       /* CP forced to bypass mode */
  63 #define LP5521_CP_MODE_1X5              0x10    /* CP forced to 1.5x mode */
  64 #define LP5521_CP_MODE_AUTO             0x18    /* Automatic mode selection */
  65 #define LP5521_R_TO_BATT                0x04    /* R out: 0 = CP, 1 = Vbat */
  66 #define LP5521_CLK_INT                  0x01    /* Internal clock */
  67 #define LP5521_DEFAULT_CFG              \
  68         (LP5521_PWM_HF | LP5521_PWRSAVE_EN | LP5521_CP_MODE_AUTO)
  69
  70 /* Status */
  71 #define LP5521_EXT_CLK_USED             0x08
  72
  73 /* default R channel current register value */
  74 #define LP5521_REG_R_CURR_DEFAULT       0xAF
  75
  76 /* Reset register value */
  77 #define LP5521_RESET                    0xFF
  78
  79 /* Program Memory Operations */
  80 #define LP5521_MODE_R_M                 0x30    /* Operation Mode Register */
  81 #define LP5521_MODE_G_M                 0x0C
  82 #define LP5521_MODE_B_M                 0x03
  83 #define LP5521_LOAD_R                   0x10
  84 #define LP5521_LOAD_G                   0x04
  85 #define LP5521_LOAD_B                   0x01
  86
  87 #define LP5521_R_IS_LOADING(mode)       \
  88         ((mode & LP5521_MODE_R_M) == LP5521_LOAD_R)
  89 #define LP5521_G_IS_LOADING(mode)       \
  90         ((mode & LP5521_MODE_G_M) == LP5521_LOAD_G)
  91 #define LP5521_B_IS_LOADING(mode)       \
  92         ((mode & LP5521_MODE_B_M) == LP5521_LOAD_B)
  93
  94 #define LP5521_EXEC_R_M                 0x30    /* Enable Register */
  95 #define LP5521_EXEC_G_M                 0x0C
  96 #define LP5521_EXEC_B_M                 0x03
  97 #define LP5521_EXEC_M                   0x3F
  98 #define LP5521_RUN_R                    0x20
  99 #define LP5521_RUN_G                    0x08
 100 #define LP5521_RUN_B                    0x02
 101
 102 static inline void lp5521_wait_opmode_done(void)
 103 {
 104         /* operation mode change needs to be longer than 153 us */
 105         usleep_range(200, 300);
 106 }
 107
 108 static inline void lp5521_wait_enable_done(void)
 109 {
 110         /* it takes more 488 us to update ENABLE register */
 111         usleep_range(500, 600);
 112 }
 113
 114 static void lp5521_set_led_current(struct lp55xx_led *led, u8 led_current)
 115 {
 116         led->led_current = led_current;
 117         lp55xx_write(led->chip, LP5521_REG_LED_CURRENT_BASE + led->chan_nr,
 118                 led_current);
 119 }
 120
 121 static void lp5521_load_engine(struct lp55xx_chip *chip)
 122 {
 123         enum lp55xx_engine_index idx = chip->engine_idx;
 124         static const u8 mask[] = {
 125                 [LP55XX_ENGINE_1] = LP5521_MODE_R_M,
 126                 [LP55XX_ENGINE_2] = LP5521_MODE_G_M,
 127                 [LP55XX_ENGINE_3] = LP5521_MODE_B_M,
 128         };
 129
 130         static const u8 val[] = {
 131                 [LP55XX_ENGINE_1] = LP5521_LOAD_R,
 132                 [LP55XX_ENGINE_2] = LP5521_LOAD_G,
 133                 [LP55XX_ENGINE_3] = LP5521_LOAD_B,
 134         };
 135
 136         lp55xx_update_bits(chip, LP5521_REG_OP_MODE, mask[idx], val[idx]);
 137
 138         lp5521_wait_opmode_done();
 139 }
 140
 141 static void lp5521_stop_all_engines(struct lp55xx_chip *chip)
 142 {
 143         lp55xx_write(chip, LP5521_REG_OP_MODE, 0);
 144         lp5521_wait_opmode_done();
 145 }
 146
 147 static void lp5521_stop_engine(struct lp55xx_chip *chip)
 148 {
 149         enum lp55xx_engine_index idx = chip->engine_idx;
 150         static const u8 mask[] = {
 151                 [LP55XX_ENGINE_1] = LP5521_MODE_R_M,
 152                 [LP55XX_ENGINE_2] = LP5521_MODE_G_M,
 153                 [LP55XX_ENGINE_3] = LP5521_MODE_B_M,
 154         };
 155
 156         lp55xx_update_bits(chip, LP5521_REG_OP_MODE, mask[idx], 0);
 157
 158         lp5521_wait_opmode_done();
 159 }
 160
 161 static void lp5521_run_engine(struct lp55xx_chip *chip, bool start)
 162 {
 163         int ret;
 164         u8 mode;
 165         u8 exec;
 166
 167         /* stop engine */
 168         if (!start) {
 169                 lp5521_stop_engine(chip);
 170                 lp55xx_write(chip, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
 171                 lp5521_wait_opmode_done();
 172                 return;
 173         }
 174
 175         /*
 176          * To run the engine,
 177          * operation mode and enable register should updated at the same time
 178          */
 179
 180         ret = lp55xx_read(chip, LP5521_REG_OP_MODE, &mode);
 181         if (ret)
 182                 return;
 183
 184         ret = lp55xx_read(chip, LP5521_REG_ENABLE, &exec);
 185         if (ret)
 186                 return;
 187
 188         /* change operation mode to RUN only when each engine is loading */
 189         if (LP5521_R_IS_LOADING(mode)) {
 190                 mode = (mode & ~LP5521_MODE_R_M) | LP5521_RUN_R;
 191                 exec = (exec & ~LP5521_EXEC_R_M) | LP5521_RUN_R;
 192         }
 193
 194         if (LP5521_G_IS_LOADING(mode)) {
 195                 mode = (mode & ~LP5521_MODE_G_M) | LP5521_RUN_G;
 196                 exec = (exec & ~LP5521_EXEC_G_M) | LP5521_RUN_G;
 197         }
 198
 199         if (LP5521_B_IS_LOADING(mode)) {
 200                 mode = (mode & ~LP5521_MODE_B_M) | LP5521_RUN_B;
 201                 exec = (exec & ~LP5521_EXEC_B_M) | LP5521_RUN_B;
 202         }
 203
 204         lp55xx_write(chip, LP5521_REG_OP_MODE, mode);
 205         lp5521_wait_opmode_done();
 206
 207         lp55xx_update_bits(chip, LP5521_REG_ENABLE, LP5521_EXEC_M, exec);
 208         lp5521_wait_enable_done();
 209 }
 210
 211 static int lp5521_update_program_memory(struct lp55xx_chip *chip,
 212                                         const u8 *data, size_t size)
 213 {
 214         enum lp55xx_engine_index idx = chip->engine_idx;
 215         u8 pattern[LP5521_PROGRAM_LENGTH] = {0};
 216         static const u8 addr[] = {
 217                 [LP55XX_ENGINE_1] = LP5521_REG_R_PROG_MEM,
 218                 [LP55XX_ENGINE_2] = LP5521_REG_G_PROG_MEM,
 219                 [LP55XX_ENGINE_3] = LP5521_REG_B_PROG_MEM,
 220         };
 221         unsigned cmd;
 222         char c[3];
 223         int nrchars;
 224         int ret;
 225         int offset = 0;
 226         int i = 0;
 227
 228         while ((offset < size - 1) && (i < LP5521_PROGRAM_LENGTH)) {
 229                 /* separate sscanfs because length is working only for %s */
 230                 ret = sscanf(data + offset, "%2s%n ", c, &nrchars);
 231                 if (ret != 1)
 232                         goto err;
 233
 234                 ret = sscanf(c, "%2x", &cmd);
 235                 if (ret != 1)
 236                         goto err;
 237
 238                 pattern[i] = (u8)cmd;
 239                 offset += nrchars;
 240                 i++;
 241         }
 242
 243         /* Each instruction is 16bit long. Check that length is even */
 244         if (i % 2)
 245                 goto err;
 246
 247         for (i = 0; i < LP5521_PROGRAM_LENGTH; i++) {
 248                 ret = lp55xx_write(chip, addr[idx] + i, pattern[i]);
 249                 if (ret)
 250                         return -EINVAL;
 251         }
 252
 253         return size;
 254
 255 err:
 256         dev_err(&chip->cl->dev, "wrong pattern format\n");
 257         return -EINVAL;
 258 }
 259
 260 static void lp5521_firmware_loaded(struct lp55xx_chip *chip)
 261 {
 262         const struct firmware *fw = chip->fw;
 263
 264         if (fw->size > LP5521_PROGRAM_LENGTH) {
 265                 dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n",
 266                         fw->size);
 267                 return;
 268         }
 269
 270         /*
 271          * Program memory sequence
 272          *  1) set engine mode to "LOAD"
 273          *  2) write firmware data into program memory
 274          */
 275
 276         lp5521_load_engine(chip);
 277         lp5521_update_program_memory(chip, fw->data, fw->size);
 278 }
 279
 280 static int lp5521_post_init_device(struct lp55xx_chip *chip)
 281 {
 282         int ret;
 283         u8 val;
 284
 285         /*
 286          * Make sure that the chip is reset by reading back the r channel
 287          * current reg. This is dummy read is required on some platforms -
 288          * otherwise further access to the R G B channels in the
 289          * LP5521_REG_ENABLE register will not have any effect - strange!
 290          */
 291         ret = lp55xx_read(chip, LP5521_REG_R_CURRENT, &val);
 292         if (ret) {
 293                 dev_err(&chip->cl->dev, "error in resetting chip\n");
 294                 return ret;
 295         }
 296         if (val != LP5521_REG_R_CURR_DEFAULT) {
 297                 dev_err(&chip->cl->dev,
 298                         "unexpected data in register (expected 0x%x got 0x%x)\n",
 299                         LP5521_REG_R_CURR_DEFAULT, val);
 300                 ret = -EINVAL;
 301                 return ret;
 302         }
 303         usleep_range(10000, 20000);
 304
 305         /* Set all PWMs to direct control mode */
 306         ret = lp55xx_write(chip, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
 307
 308         /* Update configuration for the clock setting */
 309         val = LP5521_DEFAULT_CFG;
 310         if (!lp55xx_is_extclk_used(chip))
 311                 val |= LP5521_CLK_INT;
 312
 313         ret = lp55xx_write(chip, LP5521_REG_CONFIG, val);
 314         if (ret)
 315                 return ret;
 316
 317         /* Initialize all channels PWM to zero -> leds off */
 318         lp55xx_write(chip, LP5521_REG_R_PWM, 0);
 319         lp55xx_write(chip, LP5521_REG_G_PWM, 0);
 320         lp55xx_write(chip, LP5521_REG_B_PWM, 0);
 321
 322         /* Set engines are set to run state when OP_MODE enables engines */
 323         ret = lp55xx_write(chip, LP5521_REG_ENABLE, LP5521_ENABLE_RUN_PROGRAM);
 324         if (ret)
 325                 return ret;
 326
 327         lp5521_wait_enable_done();
 328
 329         return 0;
 330 }
 331
 332 static int lp5521_run_selftest(struct lp55xx_chip *chip, char *buf)
 333 {
 334         struct lp55xx_platform_data *pdata = chip->pdata;
 335         int ret;
 336         u8 status;
 337
 338         ret = lp55xx_read(chip, LP5521_REG_STATUS, &status);
 339         if (ret < 0)
 340                 return ret;
 341
 342         if (pdata->clock_mode != LP55XX_CLOCK_EXT)
 343                 return 0;
 344
 345         /* Check that ext clock is really in use if requested */
 346         if  ((status & LP5521_EXT_CLK_USED) == 0)
 347                 return -EIO;
 348
 349         return 0;
 350 }
 351
 352 static int lp5521_multicolor_brightness(struct lp55xx_led *led)
 353 {
 354         struct lp55xx_chip *chip = led->chip;
 355         int ret;
 356         int i;
 357
 358         mutex_lock(&chip->lock);
 359         for (i = 0; i < led->mc_cdev.num_colors; i++) {
 360                 ret = lp55xx_write(chip,
 361                                    LP5521_REG_LED_PWM_BASE +
 362                                    led->mc_cdev.subled_info[i].channel,
 363                                    led->mc_cdev.subled_info[i].brightness);
 364                 if (ret)
 365                         break;
 366         }
 367         mutex_unlock(&chip->lock);
 368         return ret;
 369 }
 370
 371 static int lp5521_led_brightness(struct lp55xx_led *led)
 372 {
 373         struct lp55xx_chip *chip = led->chip;
 374         int ret;
 375
 376         mutex_lock(&chip->lock);
 377         ret = lp55xx_write(chip, LP5521_REG_LED_PWM_BASE + led->chan_nr,
 378                 led->brightness);
 379         mutex_unlock(&chip->lock);
 380
 381         return ret;
 382 }
 383
 384 static ssize_t show_engine_mode(struct device *dev,
 385                                 struct device_attribute *attr,
 386                                 char *buf, int nr)
 387 {
 388         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 389         struct lp55xx_chip *chip = led->chip;
 390         enum lp55xx_engine_mode mode = chip->engines[nr - 1].mode;
 391
 392         switch (mode) {
 393         case LP55XX_ENGINE_RUN:
 394                 return sprintf(buf, "run\n");
 395         case LP55XX_ENGINE_LOAD:
 396                 return sprintf(buf, "load\n");
 397         case LP55XX_ENGINE_DISABLED:
 398         default:
 399                 return sprintf(buf, "disabled\n");
 400         }
 401 }
 402 show_mode(1)
 403 show_mode(2)
 404 show_mode(3)
 405
 406 static ssize_t store_engine_mode(struct device *dev,
 407                                  struct device_attribute *attr,
 408                                  const char *buf, size_t len, int nr)
 409 {
 410         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 411         struct lp55xx_chip *chip = led->chip;
 412         struct lp55xx_engine *engine = &chip->engines[nr - 1];
 413
 414         mutex_lock(&chip->lock);
 415
 416         chip->engine_idx = nr;
 417
 418         if (!strncmp(buf, "run", 3)) {
 419                 lp5521_run_engine(chip, true);
 420                 engine->mode = LP55XX_ENGINE_RUN;
 421         } else if (!strncmp(buf, "load", 4)) {
 422                 lp5521_stop_engine(chip);
 423                 lp5521_load_engine(chip);
 424                 engine->mode = LP55XX_ENGINE_LOAD;
 425         } else if (!strncmp(buf, "disabled", 8)) {
 426                 lp5521_stop_engine(chip);
 427                 engine->mode = LP55XX_ENGINE_DISABLED;
 428         }
 429
 430         mutex_unlock(&chip->lock);
 431
 432         return len;
 433 }
 434 store_mode(1)
 435 store_mode(2)
 436 store_mode(3)
 437
 438 static ssize_t store_engine_load(struct device *dev,
 439                              struct device_attribute *attr,
 440                              const char *buf, size_t len, int nr)
 441 {
 442         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 443         struct lp55xx_chip *chip = led->chip;
 444         int ret;
 445
 446         mutex_lock(&chip->lock);
 447
 448         chip->engine_idx = nr;
 449         lp5521_load_engine(chip);
 450         ret = lp5521_update_program_memory(chip, buf, len);
 451
 452         mutex_unlock(&chip->lock);
 453
 454         return ret;
 455 }
 456 store_load(1)
 457 store_load(2)
 458 store_load(3)
 459
 460 static ssize_t lp5521_selftest(struct device *dev,
 461                                struct device_attribute *attr,
 462                                char *buf)
 463 {
 464         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 465         struct lp55xx_chip *chip = led->chip;
 466         int ret;
 467
 468         mutex_lock(&chip->lock);
 469         ret = lp5521_run_selftest(chip, buf);
 470         mutex_unlock(&chip->lock);
 471
 472         return scnprintf(buf, PAGE_SIZE, "%s\n", ret ? "FAIL" : "OK");
 473 }
 474
 475 /* device attributes */
 476 static LP55XX_DEV_ATTR_RW(engine1_mode, show_engine1_mode, store_engine1_mode);
 477 static LP55XX_DEV_ATTR_RW(engine2_mode, show_engine2_mode, store_engine2_mode);
 478 static LP55XX_DEV_ATTR_RW(engine3_mode, show_engine3_mode, store_engine3_mode);
 479 static LP55XX_DEV_ATTR_WO(engine1_load, store_engine1_load);
 480 static LP55XX_DEV_ATTR_WO(engine2_load, store_engine2_load);
 481 static LP55XX_DEV_ATTR_WO(engine3_load, store_engine3_load);
 482 static LP55XX_DEV_ATTR_RO(selftest, lp5521_selftest);
 483
 484 static struct attribute *lp5521_attributes[] = {
 485         &dev_attr_engine1_mode.attr,
 486         &dev_attr_engine2_mode.attr,
 487         &dev_attr_engine3_mode.attr,
 488         &dev_attr_engine1_load.attr,
 489         &dev_attr_engine2_load.attr,
 490         &dev_attr_engine3_load.attr,
 491         &dev_attr_selftest.attr,
 492         NULL
 493 };
 494
 495 static const struct attribute_group lp5521_group = {
 496         .attrs = lp5521_attributes,
 497 };
 498
 499 /* Chip specific configurations */
 500 static struct lp55xx_device_config lp5521_cfg = {
 501         .reset = {
 502                 .addr = LP5521_REG_RESET,
 503                 .val  = LP5521_RESET,
 504         },
 505         .enable = {
 506                 .addr = LP5521_REG_ENABLE,
 507                 .val  = LP5521_ENABLE_DEFAULT,
 508         },
 509         .max_channel  = LP5521_MAX_LEDS,
 510         .post_init_device   = lp5521_post_init_device,
 511         .brightness_fn      = lp5521_led_brightness,
 512         .multicolor_brightness_fn = lp5521_multicolor_brightness,
 513         .set_led_current    = lp5521_set_led_current,
 514         .firmware_cb        = lp5521_firmware_loaded,
 515         .run_engine         = lp5521_run_engine,
 516         .dev_attr_group     = &lp5521_group,
 517 };
 518
 519 static int lp5521_probe(struct i2c_client *client,
 520                         const struct i2c_device_id *id)
 521 {
 522         int ret;
 523         struct lp55xx_chip *chip;
 524         struct lp55xx_led *led;
 525         struct lp55xx_platform_data *pdata = dev_get_platdata(&client->dev);
 526         struct device_node *np = dev_of_node(&client->dev);
 527
 528         chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
 529         if (!chip)
 530                 return -ENOMEM;
 531
 532         chip->cfg = &lp5521_cfg;
 533
 534         if (!pdata) {
 535                 if (np) {
 536                         pdata = lp55xx_of_populate_pdata(&client->dev, np,
 537                                                          chip);
 538                         if (IS_ERR(pdata))
 539                                 return PTR_ERR(pdata);
 540                 } else {
 541                         dev_err(&client->dev, "no platform data\n");
 542                         return -EINVAL;
 543                 }
 544         }
 545
 546         led = devm_kcalloc(&client->dev,
 547                         pdata->num_channels, sizeof(*led), GFP_KERNEL);
 548         if (!led)
 549                 return -ENOMEM;
 550
 551         chip->cl = client;
 552         chip->pdata = pdata;
 553
 554         mutex_init(&chip->lock);
 555
 556         i2c_set_clientdata(client, led);
 557
 558         ret = lp55xx_init_device(chip);
 559         if (ret)
 560                 goto err_init;
 561
 562         dev_info(&client->dev, "%s programmable led chip found\n", id->name);
 563
 564         ret = lp55xx_register_leds(led, chip);
 565         if (ret)
 566                 goto err_out;
 567
 568         ret = lp55xx_register_sysfs(chip);
 569         if (ret) {
 570                 dev_err(&client->dev, "registering sysfs failed\n");
 571                 goto err_out;
 572         }
 573
 574         return 0;
 575
 576 err_out:
 577         lp55xx_deinit_device(chip);
 578 err_init:
 579         return ret;
 580 }
 581
 582 static int lp5521_remove(struct i2c_client *client)
 583 {
 584         struct lp55xx_led *led = i2c_get_clientdata(client);
 585         struct lp55xx_chip *chip = led->chip;
 586
 587         lp5521_stop_all_engines(chip);
 588         lp55xx_unregister_sysfs(chip);
 589         lp55xx_deinit_device(chip);
 590
 591         return 0;
 592 }
 593
 594 static const struct i2c_device_id lp5521_id[] = {
 595         { "lp5521", 0 }, /* Three channel chip */
 596         { }
 597 };
 598 MODULE_DEVICE_TABLE(i2c, lp5521_id);
 599
 600 #ifdef CONFIG_OF
 601 static const struct of_device_id of_lp5521_leds_match[] = {
 602         { .compatible = "national,lp5521", },
 603         {},
 604 };
 605
 606 MODULE_DEVICE_TABLE(of, of_lp5521_leds_match);
 607 #endif
 608 static struct i2c_driver lp5521_driver = {
 609         .driver = {
 610                 .name   = "lp5521",
 611                 .of_match_table = of_match_ptr(of_lp5521_leds_match),
 612         },
 613         .probe          = lp5521_probe,
 614         .remove         = lp5521_remove,
 615         .id_table       = lp5521_id,
 616 };
 617
 618 module_i2c_driver(lp5521_driver);
 619
 620 MODULE_AUTHOR("Mathias Nyman, Yuri Zaporozhets, Samu Onkalo");
 621 MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
 622 MODULE_DESCRIPTION("LP5521 LED engine");
 623 MODULE_LICENSE("GPL v2");