drivers/leds/leds-lp5521.c

   1 /*
   2  * LP5521 LED chip driver.
   3  *
   4  * Copyright (C) 2010 Nokia Corporation
   5  * Copyright (C) 2012 Texas Instruments
   6  *
   7  * Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
   8  *          Milo(Woogyom) Kim <milo.kim@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  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  22  * 02110-1301 USA
  23  */
  24
  25 #include <linux/delay.h>
  26 #include <linux/firmware.h>
  27 #include <linux/i2c.h>
  28 #include <linux/leds.h>
  29 #include <linux/module.h>
  30 #include <linux/mutex.h>
  31 #include <linux/platform_data/leds-lp55xx.h>
  32 #include <linux/slab.h>
  33 #include <linux/of.h>
  34
  35 #include "leds-lp55xx-common.h"
  36
  37 #define LP5521_PROGRAM_LENGTH           32
  38 #define LP5521_MAX_LEDS                 3
  39 #define LP5521_CMD_DIRECT               0x3F
  40
  41 /* Registers */
  42 #define LP5521_REG_ENABLE               0x00
  43 #define LP5521_REG_OP_MODE              0x01
  44 #define LP5521_REG_R_PWM                0x02
  45 #define LP5521_REG_G_PWM                0x03
  46 #define LP5521_REG_B_PWM                0x04
  47 #define LP5521_REG_R_CURRENT            0x05
  48 #define LP5521_REG_G_CURRENT            0x06
  49 #define LP5521_REG_B_CURRENT            0x07
  50 #define LP5521_REG_CONFIG               0x08
  51 #define LP5521_REG_STATUS               0x0C
  52 #define LP5521_REG_RESET                0x0D
  53 #define LP5521_REG_R_PROG_MEM           0x10
  54 #define LP5521_REG_G_PROG_MEM           0x30
  55 #define LP5521_REG_B_PROG_MEM           0x50
  56
  57 /* Base register to set LED current */
  58 #define LP5521_REG_LED_CURRENT_BASE     LP5521_REG_R_CURRENT
  59 /* Base register to set the brightness */
  60 #define LP5521_REG_LED_PWM_BASE         LP5521_REG_R_PWM
  61
  62 /* Bits in ENABLE register */
  63 #define LP5521_MASTER_ENABLE            0x40    /* Chip master enable */
  64 #define LP5521_LOGARITHMIC_PWM          0x80    /* Logarithmic PWM adjustment */
  65 #define LP5521_EXEC_RUN                 0x2A
  66 #define LP5521_ENABLE_DEFAULT   \
  67         (LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM)
  68 #define LP5521_ENABLE_RUN_PROGRAM       \
  69         (LP5521_ENABLE_DEFAULT | LP5521_EXEC_RUN)
  70
  71 /* CONFIG register */
  72 #define LP5521_PWM_HF                   0x40    /* PWM: 0 = 256Hz, 1 = 558Hz */
  73 #define LP5521_PWRSAVE_EN               0x20    /* 1 = Power save mode */
  74 #define LP5521_CP_MODE_OFF              0       /* Charge pump (CP) off */
  75 #define LP5521_CP_MODE_BYPASS           8       /* CP forced to bypass mode */
  76 #define LP5521_CP_MODE_1X5              0x10    /* CP forced to 1.5x mode */
  77 #define LP5521_CP_MODE_AUTO             0x18    /* Automatic mode selection */
  78 #define LP5521_R_TO_BATT                0x04    /* R out: 0 = CP, 1 = Vbat */
  79 #define LP5521_CLK_INT                  0x01    /* Internal clock */
  80 #define LP5521_DEFAULT_CFG              \
  81         (LP5521_PWM_HF | LP5521_PWRSAVE_EN | LP5521_CP_MODE_AUTO)
  82
  83 /* Status */
  84 #define LP5521_EXT_CLK_USED             0x08
  85
  86 /* default R channel current register value */
  87 #define LP5521_REG_R_CURR_DEFAULT       0xAF
  88
  89 /* Reset register value */
  90 #define LP5521_RESET                    0xFF
  91
  92 /* Program Memory Operations */
  93 #define LP5521_MODE_R_M                 0x30    /* Operation Mode Register */
  94 #define LP5521_MODE_G_M                 0x0C
  95 #define LP5521_MODE_B_M                 0x03
  96 #define LP5521_LOAD_R                   0x10
  97 #define LP5521_LOAD_G                   0x04
  98 #define LP5521_LOAD_B                   0x01
  99
 100 #define LP5521_R_IS_LOADING(mode)       \
 101         ((mode & LP5521_MODE_R_M) == LP5521_LOAD_R)
 102 #define LP5521_G_IS_LOADING(mode)       \
 103         ((mode & LP5521_MODE_G_M) == LP5521_LOAD_G)
 104 #define LP5521_B_IS_LOADING(mode)       \
 105         ((mode & LP5521_MODE_B_M) == LP5521_LOAD_B)
 106
 107 #define LP5521_EXEC_R_M                 0x30    /* Enable Register */
 108 #define LP5521_EXEC_G_M                 0x0C
 109 #define LP5521_EXEC_B_M                 0x03
 110 #define LP5521_EXEC_M                   0x3F
 111 #define LP5521_RUN_R                    0x20
 112 #define LP5521_RUN_G                    0x08
 113 #define LP5521_RUN_B                    0x02
 114
 115 static inline void lp5521_wait_opmode_done(void)
 116 {
 117         /* operation mode change needs to be longer than 153 us */
 118         usleep_range(200, 300);
 119 }
 120
 121 static inline void lp5521_wait_enable_done(void)
 122 {
 123         /* it takes more 488 us to update ENABLE register */
 124         usleep_range(500, 600);
 125 }
 126
 127 static void lp5521_set_led_current(struct lp55xx_led *led, u8 led_current)
 128 {
 129         led->led_current = led_current;
 130         lp55xx_write(led->chip, LP5521_REG_LED_CURRENT_BASE + led->chan_nr,
 131                 led_current);
 132 }
 133
 134 static void lp5521_load_engine(struct lp55xx_chip *chip)
 135 {
 136         enum lp55xx_engine_index idx = chip->engine_idx;
 137         u8 mask[] = {
 138                 [LP55XX_ENGINE_1] = LP5521_MODE_R_M,
 139                 [LP55XX_ENGINE_2] = LP5521_MODE_G_M,
 140                 [LP55XX_ENGINE_3] = LP5521_MODE_B_M,
 141         };
 142
 143         u8 val[] = {
 144                 [LP55XX_ENGINE_1] = LP5521_LOAD_R,
 145                 [LP55XX_ENGINE_2] = LP5521_LOAD_G,
 146                 [LP55XX_ENGINE_3] = LP5521_LOAD_B,
 147         };
 148
 149         lp55xx_update_bits(chip, LP5521_REG_OP_MODE, mask[idx], val[idx]);
 150
 151         lp5521_wait_opmode_done();
 152 }
 153
 154 static void lp5521_stop_all_engines(struct lp55xx_chip *chip)
 155 {
 156         lp55xx_write(chip, LP5521_REG_OP_MODE, 0);
 157         lp5521_wait_opmode_done();
 158 }
 159
 160 static void lp5521_stop_engine(struct lp55xx_chip *chip)
 161 {
 162         enum lp55xx_engine_index idx = chip->engine_idx;
 163         u8 mask[] = {
 164                 [LP55XX_ENGINE_1] = LP5521_MODE_R_M,
 165                 [LP55XX_ENGINE_2] = LP5521_MODE_G_M,
 166                 [LP55XX_ENGINE_3] = LP5521_MODE_B_M,
 167         };
 168
 169         lp55xx_update_bits(chip, LP5521_REG_OP_MODE, mask[idx], 0);
 170
 171         lp5521_wait_opmode_done();
 172 }
 173
 174 static void lp5521_run_engine(struct lp55xx_chip *chip, bool start)
 175 {
 176         int ret;
 177         u8 mode;
 178         u8 exec;
 179
 180         /* stop engine */
 181         if (!start) {
 182                 lp5521_stop_engine(chip);
 183                 lp55xx_write(chip, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
 184                 lp5521_wait_opmode_done();
 185                 return;
 186         }
 187
 188         /*
 189          * To run the engine,
 190          * operation mode and enable register should updated at the same time
 191          */
 192
 193         ret = lp55xx_read(chip, LP5521_REG_OP_MODE, &mode);
 194         if (ret)
 195                 return;
 196
 197         ret = lp55xx_read(chip, LP5521_REG_ENABLE, &exec);
 198         if (ret)
 199                 return;
 200
 201         /* change operation mode to RUN only when each engine is loading */
 202         if (LP5521_R_IS_LOADING(mode)) {
 203                 mode = (mode & ~LP5521_MODE_R_M) | LP5521_RUN_R;
 204                 exec = (exec & ~LP5521_EXEC_R_M) | LP5521_RUN_R;
 205         }
 206
 207         if (LP5521_G_IS_LOADING(mode)) {
 208                 mode = (mode & ~LP5521_MODE_G_M) | LP5521_RUN_G;
 209                 exec = (exec & ~LP5521_EXEC_G_M) | LP5521_RUN_G;
 210         }
 211
 212         if (LP5521_B_IS_LOADING(mode)) {
 213                 mode = (mode & ~LP5521_MODE_B_M) | LP5521_RUN_B;
 214                 exec = (exec & ~LP5521_EXEC_B_M) | LP5521_RUN_B;
 215         }
 216
 217         lp55xx_write(chip, LP5521_REG_OP_MODE, mode);
 218         lp5521_wait_opmode_done();
 219
 220         lp55xx_update_bits(chip, LP5521_REG_ENABLE, LP5521_EXEC_M, exec);
 221         lp5521_wait_enable_done();
 222 }
 223
 224 static int lp5521_update_program_memory(struct lp55xx_chip *chip,
 225                                         const u8 *data, size_t size)
 226 {
 227         enum lp55xx_engine_index idx = chip->engine_idx;
 228         u8 pattern[LP5521_PROGRAM_LENGTH] = {0};
 229         u8 addr[] = {
 230                 [LP55XX_ENGINE_1] = LP5521_REG_R_PROG_MEM,
 231                 [LP55XX_ENGINE_2] = LP5521_REG_G_PROG_MEM,
 232                 [LP55XX_ENGINE_3] = LP5521_REG_B_PROG_MEM,
 233         };
 234         unsigned cmd;
 235         char c[3];
 236         int nrchars;
 237         int ret;
 238         int offset = 0;
 239         int i = 0;
 240
 241         while ((offset < size - 1) && (i < LP5521_PROGRAM_LENGTH)) {
 242                 /* separate sscanfs because length is working only for %s */
 243                 ret = sscanf(data + offset, "%2s%n ", c, &nrchars);
 244                 if (ret != 1)
 245                         goto err;
 246
 247                 ret = sscanf(c, "%2x", &cmd);
 248                 if (ret != 1)
 249                         goto err;
 250
 251                 pattern[i] = (u8)cmd;
 252                 offset += nrchars;
 253                 i++;
 254         }
 255
 256         /* Each instruction is 16bit long. Check that length is even */
 257         if (i % 2)
 258                 goto err;
 259
 260         for (i = 0; i < LP5521_PROGRAM_LENGTH; i++) {
 261                 ret = lp55xx_write(chip, addr[idx] + i, pattern[i]);
 262                 if (ret)
 263                         return -EINVAL;
 264         }
 265
 266         return size;
 267
 268 err:
 269         dev_err(&chip->cl->dev, "wrong pattern format\n");
 270         return -EINVAL;
 271 }
 272
 273 static void lp5521_firmware_loaded(struct lp55xx_chip *chip)
 274 {
 275         const struct firmware *fw = chip->fw;
 276
 277         if (fw->size > LP5521_PROGRAM_LENGTH) {
 278                 dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n",
 279                         fw->size);
 280                 return;
 281         }
 282
 283         /*
 284          * Program momery sequence
 285          *  1) set engine mode to "LOAD"
 286          *  2) write firmware data into program memory
 287          */
 288
 289         lp5521_load_engine(chip);
 290         lp5521_update_program_memory(chip, fw->data, fw->size);
 291 }
 292
 293 static int lp5521_post_init_device(struct lp55xx_chip *chip)
 294 {
 295         int ret;
 296         u8 val;
 297
 298         /*
 299          * Make sure that the chip is reset by reading back the r channel
 300          * current reg. This is dummy read is required on some platforms -
 301          * otherwise further access to the R G B channels in the
 302          * LP5521_REG_ENABLE register will not have any effect - strange!
 303          */
 304         ret = lp55xx_read(chip, LP5521_REG_R_CURRENT, &val);
 305         if (ret) {
 306                 dev_err(&chip->cl->dev, "error in resetting chip\n");
 307                 return ret;
 308         }
 309         if (val != LP5521_REG_R_CURR_DEFAULT) {
 310                 dev_err(&chip->cl->dev,
 311                         "unexpected data in register (expected 0x%x got 0x%x)\n",
 312                         LP5521_REG_R_CURR_DEFAULT, val);
 313                 ret = -EINVAL;
 314                 return ret;
 315         }
 316         usleep_range(10000, 20000);
 317
 318         /* Set all PWMs to direct control mode */
 319         ret = lp55xx_write(chip, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
 320
 321         /* Update configuration for the clock setting */
 322         val = LP5521_DEFAULT_CFG;
 323         if (!lp55xx_is_extclk_used(chip))
 324                 val |= LP5521_CLK_INT;
 325
 326         ret = lp55xx_write(chip, LP5521_REG_CONFIG, val);
 327         if (ret)
 328                 return ret;
 329
 330         /* Initialize all channels PWM to zero -> leds off */
 331         lp55xx_write(chip, LP5521_REG_R_PWM, 0);
 332         lp55xx_write(chip, LP5521_REG_G_PWM, 0);
 333         lp55xx_write(chip, LP5521_REG_B_PWM, 0);
 334
 335         /* Set engines are set to run state when OP_MODE enables engines */
 336         ret = lp55xx_write(chip, LP5521_REG_ENABLE, LP5521_ENABLE_RUN_PROGRAM);
 337         if (ret)
 338                 return ret;
 339
 340         lp5521_wait_enable_done();
 341
 342         return 0;
 343 }
 344
 345 static int lp5521_run_selftest(struct lp55xx_chip *chip, char *buf)
 346 {
 347         struct lp55xx_platform_data *pdata = chip->pdata;
 348         int ret;
 349         u8 status;
 350
 351         ret = lp55xx_read(chip, LP5521_REG_STATUS, &status);
 352         if (ret < 0)
 353                 return ret;
 354
 355         if (pdata->clock_mode != LP55XX_CLOCK_EXT)
 356                 return 0;
 357
 358         /* Check that ext clock is really in use if requested */
 359         if  ((status & LP5521_EXT_CLK_USED) == 0)
 360                 return -EIO;
 361
 362         return 0;
 363 }
 364
 365 static int lp5521_led_brightness(struct lp55xx_led *led)
 366 {
 367         struct lp55xx_chip *chip = led->chip;
 368         int ret;
 369
 370         mutex_lock(&chip->lock);
 371         ret = lp55xx_write(chip, LP5521_REG_LED_PWM_BASE + led->chan_nr,
 372                 led->brightness);
 373         mutex_unlock(&chip->lock);
 374
 375         return ret;
 376 }
 377
 378 static ssize_t show_engine_mode(struct device *dev,
 379                                 struct device_attribute *attr,
 380                                 char *buf, int nr)
 381 {
 382         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 383         struct lp55xx_chip *chip = led->chip;
 384         enum lp55xx_engine_mode mode = chip->engines[nr - 1].mode;
 385
 386         switch (mode) {
 387         case LP55XX_ENGINE_RUN:
 388                 return sprintf(buf, "run\n");
 389         case LP55XX_ENGINE_LOAD:
 390                 return sprintf(buf, "load\n");
 391         case LP55XX_ENGINE_DISABLED:
 392         default:
 393                 return sprintf(buf, "disabled\n");
 394         }
 395 }
 396 show_mode(1)
 397 show_mode(2)
 398 show_mode(3)
 399
 400 static ssize_t store_engine_mode(struct device *dev,
 401                                  struct device_attribute *attr,
 402                                  const char *buf, size_t len, int nr)
 403 {
 404         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 405         struct lp55xx_chip *chip = led->chip;
 406         struct lp55xx_engine *engine = &chip->engines[nr - 1];
 407
 408         mutex_lock(&chip->lock);
 409
 410         chip->engine_idx = nr;
 411
 412         if (!strncmp(buf, "run", 3)) {
 413                 lp5521_run_engine(chip, true);
 414                 engine->mode = LP55XX_ENGINE_RUN;
 415         } else if (!strncmp(buf, "load", 4)) {
 416                 lp5521_stop_engine(chip);
 417                 lp5521_load_engine(chip);
 418                 engine->mode = LP55XX_ENGINE_LOAD;
 419         } else if (!strncmp(buf, "disabled", 8)) {
 420                 lp5521_stop_engine(chip);
 421                 engine->mode = LP55XX_ENGINE_DISABLED;
 422         }
 423
 424         mutex_unlock(&chip->lock);
 425
 426         return len;
 427 }
 428 store_mode(1)
 429 store_mode(2)
 430 store_mode(3)
 431
 432 static ssize_t store_engine_load(struct device *dev,
 433                              struct device_attribute *attr,
 434                              const char *buf, size_t len, int nr)
 435 {
 436         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 437         struct lp55xx_chip *chip = led->chip;
 438         int ret;
 439
 440         mutex_lock(&chip->lock);
 441
 442         chip->engine_idx = nr;
 443         lp5521_load_engine(chip);
 444         ret = lp5521_update_program_memory(chip, buf, len);
 445
 446         mutex_unlock(&chip->lock);
 447
 448         return ret;
 449 }
 450 store_load(1)
 451 store_load(2)
 452 store_load(3)
 453
 454 static ssize_t lp5521_selftest(struct device *dev,
 455                                struct device_attribute *attr,
 456                                char *buf)
 457 {
 458         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 459         struct lp55xx_chip *chip = led->chip;
 460         int ret;
 461
 462         mutex_lock(&chip->lock);
 463         ret = lp5521_run_selftest(chip, buf);
 464         mutex_unlock(&chip->lock);
 465
 466         return scnprintf(buf, PAGE_SIZE, "%s\n", ret ? "FAIL" : "OK");
 467 }
 468
 469 /* device attributes */
 470 static LP55XX_DEV_ATTR_RW(engine1_mode, show_engine1_mode, store_engine1_mode);
 471 static LP55XX_DEV_ATTR_RW(engine2_mode, show_engine2_mode, store_engine2_mode);
 472 static LP55XX_DEV_ATTR_RW(engine3_mode, show_engine3_mode, store_engine3_mode);
 473 static LP55XX_DEV_ATTR_WO(engine1_load, store_engine1_load);
 474 static LP55XX_DEV_ATTR_WO(engine2_load, store_engine2_load);
 475 static LP55XX_DEV_ATTR_WO(engine3_load, store_engine3_load);
 476 static LP55XX_DEV_ATTR_RO(selftest, lp5521_selftest);
 477
 478 static struct attribute *lp5521_attributes[] = {
 479         &dev_attr_engine1_mode.attr,
 480         &dev_attr_engine2_mode.attr,
 481         &dev_attr_engine3_mode.attr,
 482         &dev_attr_engine1_load.attr,
 483         &dev_attr_engine2_load.attr,
 484         &dev_attr_engine3_load.attr,
 485         &dev_attr_selftest.attr,
 486         NULL
 487 };
 488
 489 static const struct attribute_group lp5521_group = {
 490         .attrs = lp5521_attributes,
 491 };
 492
 493 /* Chip specific configurations */
 494 static struct lp55xx_device_config lp5521_cfg = {
 495         .reset = {
 496                 .addr = LP5521_REG_RESET,
 497                 .val  = LP5521_RESET,
 498         },
 499         .enable = {
 500                 .addr = LP5521_REG_ENABLE,
 501                 .val  = LP5521_ENABLE_DEFAULT,
 502         },
 503         .max_channel  = LP5521_MAX_LEDS,
 504         .post_init_device   = lp5521_post_init_device,
 505         .brightness_fn      = lp5521_led_brightness,
 506         .set_led_current    = lp5521_set_led_current,
 507         .firmware_cb        = lp5521_firmware_loaded,
 508         .run_engine         = lp5521_run_engine,
 509         .dev_attr_group     = &lp5521_group,
 510 };
 511
 512 static int lp5521_probe(struct i2c_client *client,
 513                         const struct i2c_device_id *id)
 514 {
 515         int ret;
 516         struct lp55xx_chip *chip;
 517         struct lp55xx_led *led;
 518         struct lp55xx_platform_data *pdata = dev_get_platdata(&client->dev);
 519         struct device_node *np = client->dev.of_node;
 520
 521         if (!pdata) {
 522                 if (np) {
 523                         pdata = lp55xx_of_populate_pdata(&client->dev, np);
 524                         if (IS_ERR(pdata))
 525                                 return PTR_ERR(pdata);
 526                 } else {
 527                         dev_err(&client->dev, "no platform data\n");
 528                         return -EINVAL;
 529                 }
 530         }
 531
 532         chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
 533         if (!chip)
 534                 return -ENOMEM;
 535
 536         led = devm_kzalloc(&client->dev,
 537                         sizeof(*led) * pdata->num_channels, GFP_KERNEL);
 538         if (!led)
 539                 return -ENOMEM;
 540
 541         chip->cl = client;
 542         chip->pdata = pdata;
 543         chip->cfg = &lp5521_cfg;
 544
 545         mutex_init(&chip->lock);
 546
 547         i2c_set_clientdata(client, led);
 548
 549         ret = lp55xx_init_device(chip);
 550         if (ret)
 551                 goto err_init;
 552
 553         dev_info(&client->dev, "%s programmable led chip found\n", id->name);
 554
 555         ret = lp55xx_register_leds(led, chip);
 556         if (ret)
 557                 goto err_register_leds;
 558
 559         ret = lp55xx_register_sysfs(chip);
 560         if (ret) {
 561                 dev_err(&client->dev, "registering sysfs failed\n");
 562                 goto err_register_sysfs;
 563         }
 564
 565         return 0;
 566
 567 err_register_sysfs:
 568         lp55xx_unregister_leds(led, chip);
 569 err_register_leds:
 570         lp55xx_deinit_device(chip);
 571 err_init:
 572         return ret;
 573 }
 574
 575 static int lp5521_remove(struct i2c_client *client)
 576 {
 577         struct lp55xx_led *led = i2c_get_clientdata(client);
 578         struct lp55xx_chip *chip = led->chip;
 579
 580         lp5521_stop_all_engines(chip);
 581         lp55xx_unregister_sysfs(chip);
 582         lp55xx_unregister_leds(led, chip);
 583         lp55xx_deinit_device(chip);
 584
 585         return 0;
 586 }
 587
 588 static const struct i2c_device_id lp5521_id[] = {
 589         { "lp5521", 0 }, /* Three channel chip */
 590         { }
 591 };
 592 MODULE_DEVICE_TABLE(i2c, lp5521_id);
 593
 594 #ifdef CONFIG_OF
 595 static const struct of_device_id of_lp5521_leds_match[] = {
 596         { .compatible = "national,lp5521", },
 597         {},
 598 };
 599
 600 MODULE_DEVICE_TABLE(of, of_lp5521_leds_match);
 601 #endif
 602 static struct i2c_driver lp5521_driver = {
 603         .driver = {
 604                 .name   = "lp5521",
 605                 .of_match_table = of_match_ptr(of_lp5521_leds_match),
 606         },
 607         .probe          = lp5521_probe,
 608         .remove         = lp5521_remove,
 609         .id_table       = lp5521_id,
 610 };
 611
 612 module_i2c_driver(lp5521_driver);
 613
 614 MODULE_AUTHOR("Mathias Nyman, Yuri Zaporozhets, Samu Onkalo");
 615 MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
 616 MODULE_DESCRIPTION("LP5521 LED engine");
 617 MODULE_LICENSE("GPL v2");