drivers/leds/leds-lp5523.c

   1 /*
   2  * lp5523.c - LP5523 LED 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/init.h>
  29 #include <linux/leds.h>
  30 #include <linux/module.h>
  31 #include <linux/mutex.h>
  32 #include <linux/of.h>
  33 #include <linux/platform_data/leds-lp55xx.h>
  34 #include <linux/slab.h>
  35
  36 #include "leds-lp55xx-common.h"
  37
  38 #define LP5523_PROGRAM_LENGTH           32
  39 #define LP5523_MAX_LEDS                 9
  40
  41 /* Registers */
  42 #define LP5523_REG_ENABLE               0x00
  43 #define LP5523_REG_OP_MODE              0x01
  44 #define LP5523_REG_ENABLE_LEDS_MSB      0x04
  45 #define LP5523_REG_ENABLE_LEDS_LSB      0x05
  46 #define LP5523_REG_LED_PWM_BASE         0x16
  47 #define LP5523_REG_LED_CURRENT_BASE     0x26
  48 #define LP5523_REG_CONFIG               0x36
  49 #define LP5523_REG_STATUS               0x3A
  50 #define LP5523_REG_RESET                0x3D
  51 #define LP5523_REG_LED_TEST_CTRL        0x41
  52 #define LP5523_REG_LED_TEST_ADC         0x42
  53 #define LP5523_REG_CH1_PROG_START       0x4C
  54 #define LP5523_REG_CH2_PROG_START       0x4D
  55 #define LP5523_REG_CH3_PROG_START       0x4E
  56 #define LP5523_REG_PROG_PAGE_SEL        0x4F
  57 #define LP5523_REG_PROG_MEM             0x50
  58
  59 /* Bit description in registers */
  60 #define LP5523_ENABLE                   0x40
  61 #define LP5523_AUTO_INC                 0x40
  62 #define LP5523_PWR_SAVE                 0x20
  63 #define LP5523_PWM_PWR_SAVE             0x04
  64 #define LP5523_CP_AUTO                  0x18
  65 #define LP5523_AUTO_CLK                 0x02
  66
  67 #define LP5523_EN_LEDTEST               0x80
  68 #define LP5523_LEDTEST_DONE             0x80
  69 #define LP5523_RESET                    0xFF
  70 #define LP5523_ADC_SHORTCIRC_LIM        80
  71 #define LP5523_EXT_CLK_USED             0x08
  72 #define LP5523_ENG_STATUS_MASK          0x07
  73
  74 /* Memory Page Selection */
  75 #define LP5523_PAGE_ENG1                0
  76 #define LP5523_PAGE_ENG2                1
  77 #define LP5523_PAGE_ENG3                2
  78 #define LP5523_PAGE_MUX1                3
  79 #define LP5523_PAGE_MUX2                4
  80 #define LP5523_PAGE_MUX3                5
  81
  82 /* Program Memory Operations */
  83 #define LP5523_MODE_ENG1_M              0x30    /* Operation Mode Register */
  84 #define LP5523_MODE_ENG2_M              0x0C
  85 #define LP5523_MODE_ENG3_M              0x03
  86 #define LP5523_LOAD_ENG1                0x10
  87 #define LP5523_LOAD_ENG2                0x04
  88 #define LP5523_LOAD_ENG3                0x01
  89
  90 #define LP5523_ENG1_IS_LOADING(mode)    \
  91         ((mode & LP5523_MODE_ENG1_M) == LP5523_LOAD_ENG1)
  92 #define LP5523_ENG2_IS_LOADING(mode)    \
  93         ((mode & LP5523_MODE_ENG2_M) == LP5523_LOAD_ENG2)
  94 #define LP5523_ENG3_IS_LOADING(mode)    \
  95         ((mode & LP5523_MODE_ENG3_M) == LP5523_LOAD_ENG3)
  96
  97 #define LP5523_EXEC_ENG1_M              0x30    /* Enable Register */
  98 #define LP5523_EXEC_ENG2_M              0x0C
  99 #define LP5523_EXEC_ENG3_M              0x03
 100 #define LP5523_EXEC_M                   0x3F
 101 #define LP5523_RUN_ENG1                 0x20
 102 #define LP5523_RUN_ENG2                 0x08
 103 #define LP5523_RUN_ENG3                 0x02
 104
 105 #define LED_ACTIVE(mux, led)            (!!(mux & (0x0001 << led)))
 106
 107 enum lp5523_chip_id {
 108         LP5523,
 109         LP55231,
 110 };
 111
 112 static int lp5523_init_program_engine(struct lp55xx_chip *chip);
 113
 114 static inline void lp5523_wait_opmode_done(void)
 115 {
 116         usleep_range(1000, 2000);
 117 }
 118
 119 static void lp5523_set_led_current(struct lp55xx_led *led, u8 led_current)
 120 {
 121         led->led_current = led_current;
 122         lp55xx_write(led->chip, LP5523_REG_LED_CURRENT_BASE + led->chan_nr,
 123                 led_current);
 124 }
 125
 126 static int lp5523_post_init_device(struct lp55xx_chip *chip)
 127 {
 128         int ret;
 129
 130         ret = lp55xx_write(chip, LP5523_REG_ENABLE, LP5523_ENABLE);
 131         if (ret)
 132                 return ret;
 133
 134         /* Chip startup time is 500 us, 1 - 2 ms gives some margin */
 135         usleep_range(1000, 2000);
 136
 137         ret = lp55xx_write(chip, LP5523_REG_CONFIG,
 138                             LP5523_AUTO_INC | LP5523_PWR_SAVE |
 139                             LP5523_CP_AUTO | LP5523_AUTO_CLK |
 140                             LP5523_PWM_PWR_SAVE);
 141         if (ret)
 142                 return ret;
 143
 144         /* turn on all leds */
 145         ret = lp55xx_write(chip, LP5523_REG_ENABLE_LEDS_MSB, 0x01);
 146         if (ret)
 147                 return ret;
 148
 149         ret = lp55xx_write(chip, LP5523_REG_ENABLE_LEDS_LSB, 0xff);
 150         if (ret)
 151                 return ret;
 152
 153         return lp5523_init_program_engine(chip);
 154 }
 155
 156 static void lp5523_load_engine(struct lp55xx_chip *chip)
 157 {
 158         enum lp55xx_engine_index idx = chip->engine_idx;
 159         u8 mask[] = {
 160                 [LP55XX_ENGINE_1] = LP5523_MODE_ENG1_M,
 161                 [LP55XX_ENGINE_2] = LP5523_MODE_ENG2_M,
 162                 [LP55XX_ENGINE_3] = LP5523_MODE_ENG3_M,
 163         };
 164
 165         u8 val[] = {
 166                 [LP55XX_ENGINE_1] = LP5523_LOAD_ENG1,
 167                 [LP55XX_ENGINE_2] = LP5523_LOAD_ENG2,
 168                 [LP55XX_ENGINE_3] = LP5523_LOAD_ENG3,
 169         };
 170
 171         lp55xx_update_bits(chip, LP5523_REG_OP_MODE, mask[idx], val[idx]);
 172
 173         lp5523_wait_opmode_done();
 174 }
 175
 176 static void lp5523_load_engine_and_select_page(struct lp55xx_chip *chip)
 177 {
 178         enum lp55xx_engine_index idx = chip->engine_idx;
 179         u8 page_sel[] = {
 180                 [LP55XX_ENGINE_1] = LP5523_PAGE_ENG1,
 181                 [LP55XX_ENGINE_2] = LP5523_PAGE_ENG2,
 182                 [LP55XX_ENGINE_3] = LP5523_PAGE_ENG3,
 183         };
 184
 185         lp5523_load_engine(chip);
 186
 187         lp55xx_write(chip, LP5523_REG_PROG_PAGE_SEL, page_sel[idx]);
 188 }
 189
 190 static void lp5523_stop_engine(struct lp55xx_chip *chip)
 191 {
 192         lp55xx_write(chip, LP5523_REG_OP_MODE, 0);
 193         lp5523_wait_opmode_done();
 194 }
 195
 196 static void lp5523_turn_off_channels(struct lp55xx_chip *chip)
 197 {
 198         int i;
 199
 200         for (i = 0; i < LP5523_MAX_LEDS; i++)
 201                 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0);
 202 }
 203
 204 static void lp5523_run_engine(struct lp55xx_chip *chip, bool start)
 205 {
 206         int ret;
 207         u8 mode;
 208         u8 exec;
 209
 210         /* stop engine */
 211         if (!start) {
 212                 lp5523_stop_engine(chip);
 213                 lp5523_turn_off_channels(chip);
 214                 return;
 215         }
 216
 217         /*
 218          * To run the engine,
 219          * operation mode and enable register should updated at the same time
 220          */
 221
 222         ret = lp55xx_read(chip, LP5523_REG_OP_MODE, &mode);
 223         if (ret)
 224                 return;
 225
 226         ret = lp55xx_read(chip, LP5523_REG_ENABLE, &exec);
 227         if (ret)
 228                 return;
 229
 230         /* change operation mode to RUN only when each engine is loading */
 231         if (LP5523_ENG1_IS_LOADING(mode)) {
 232                 mode = (mode & ~LP5523_MODE_ENG1_M) | LP5523_RUN_ENG1;
 233                 exec = (exec & ~LP5523_EXEC_ENG1_M) | LP5523_RUN_ENG1;
 234         }
 235
 236         if (LP5523_ENG2_IS_LOADING(mode)) {
 237                 mode = (mode & ~LP5523_MODE_ENG2_M) | LP5523_RUN_ENG2;
 238                 exec = (exec & ~LP5523_EXEC_ENG2_M) | LP5523_RUN_ENG2;
 239         }
 240
 241         if (LP5523_ENG3_IS_LOADING(mode)) {
 242                 mode = (mode & ~LP5523_MODE_ENG3_M) | LP5523_RUN_ENG3;
 243                 exec = (exec & ~LP5523_EXEC_ENG3_M) | LP5523_RUN_ENG3;
 244         }
 245
 246         lp55xx_write(chip, LP5523_REG_OP_MODE, mode);
 247         lp5523_wait_opmode_done();
 248
 249         lp55xx_update_bits(chip, LP5523_REG_ENABLE, LP5523_EXEC_M, exec);
 250 }
 251
 252 static int lp5523_init_program_engine(struct lp55xx_chip *chip)
 253 {
 254         int i;
 255         int j;
 256         int ret;
 257         u8 status;
 258         /* one pattern per engine setting LED MUX start and stop addresses */
 259         static const u8 pattern[][LP5523_PROGRAM_LENGTH] =  {
 260                 { 0x9c, 0x30, 0x9c, 0xb0, 0x9d, 0x80, 0xd8, 0x00, 0},
 261                 { 0x9c, 0x40, 0x9c, 0xc0, 0x9d, 0x80, 0xd8, 0x00, 0},
 262                 { 0x9c, 0x50, 0x9c, 0xd0, 0x9d, 0x80, 0xd8, 0x00, 0},
 263         };
 264
 265         /* hardcode 32 bytes of memory for each engine from program memory */
 266         ret = lp55xx_write(chip, LP5523_REG_CH1_PROG_START, 0x00);
 267         if (ret)
 268                 return ret;
 269
 270         ret = lp55xx_write(chip, LP5523_REG_CH2_PROG_START, 0x10);
 271         if (ret)
 272                 return ret;
 273
 274         ret = lp55xx_write(chip, LP5523_REG_CH3_PROG_START, 0x20);
 275         if (ret)
 276                 return ret;
 277
 278         /* write LED MUX address space for each engine */
 279         for (i = LP55XX_ENGINE_1; i <= LP55XX_ENGINE_3; i++) {
 280                 chip->engine_idx = i;
 281                 lp5523_load_engine_and_select_page(chip);
 282
 283                 for (j = 0; j < LP5523_PROGRAM_LENGTH; j++) {
 284                         ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + j,
 285                                         pattern[i - 1][j]);
 286                         if (ret)
 287                                 goto out;
 288                 }
 289         }
 290
 291         lp5523_run_engine(chip, true);
 292
 293         /* Let the programs run for couple of ms and check the engine status */
 294         usleep_range(3000, 6000);
 295         lp55xx_read(chip, LP5523_REG_STATUS, &status);
 296         status &= LP5523_ENG_STATUS_MASK;
 297
 298         if (status != LP5523_ENG_STATUS_MASK) {
 299                 dev_err(&chip->cl->dev,
 300                         "cound not configure LED engine, status = 0x%.2x\n",
 301                         status);
 302                 ret = -1;
 303         }
 304
 305 out:
 306         lp5523_stop_engine(chip);
 307         return ret;
 308 }
 309
 310 static int lp5523_update_program_memory(struct lp55xx_chip *chip,
 311                                         const u8 *data, size_t size)
 312 {
 313         u8 pattern[LP5523_PROGRAM_LENGTH] = {0};
 314         unsigned cmd;
 315         char c[3];
 316         int nrchars;
 317         int ret;
 318         int offset = 0;
 319         int i = 0;
 320
 321         while ((offset < size - 1) && (i < LP5523_PROGRAM_LENGTH)) {
 322                 /* separate sscanfs because length is working only for %s */
 323                 ret = sscanf(data + offset, "%2s%n ", c, &nrchars);
 324                 if (ret != 1)
 325                         goto err;
 326
 327                 ret = sscanf(c, "%2x", &cmd);
 328                 if (ret != 1)
 329                         goto err;
 330
 331                 pattern[i] = (u8)cmd;
 332                 offset += nrchars;
 333                 i++;
 334         }
 335
 336         /* Each instruction is 16bit long. Check that length is even */
 337         if (i % 2)
 338                 goto err;
 339
 340         for (i = 0; i < LP5523_PROGRAM_LENGTH; i++) {
 341                 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + i, pattern[i]);
 342                 if (ret)
 343                         return -EINVAL;
 344         }
 345
 346         return size;
 347
 348 err:
 349         dev_err(&chip->cl->dev, "wrong pattern format\n");
 350         return -EINVAL;
 351 }
 352
 353 static void lp5523_firmware_loaded(struct lp55xx_chip *chip)
 354 {
 355         const struct firmware *fw = chip->fw;
 356
 357         if (fw->size > LP5523_PROGRAM_LENGTH) {
 358                 dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n",
 359                         fw->size);
 360                 return;
 361         }
 362
 363         /*
 364          * Program momery sequence
 365          *  1) set engine mode to "LOAD"
 366          *  2) write firmware data into program memory
 367          */
 368
 369         lp5523_load_engine_and_select_page(chip);
 370         lp5523_update_program_memory(chip, fw->data, fw->size);
 371 }
 372
 373 static ssize_t show_engine_mode(struct device *dev,
 374                                 struct device_attribute *attr,
 375                                 char *buf, int nr)
 376 {
 377         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 378         struct lp55xx_chip *chip = led->chip;
 379         enum lp55xx_engine_mode mode = chip->engines[nr - 1].mode;
 380
 381         switch (mode) {
 382         case LP55XX_ENGINE_RUN:
 383                 return sprintf(buf, "run\n");
 384         case LP55XX_ENGINE_LOAD:
 385                 return sprintf(buf, "load\n");
 386         case LP55XX_ENGINE_DISABLED:
 387         default:
 388                 return sprintf(buf, "disabled\n");
 389         }
 390 }
 391 show_mode(1)
 392 show_mode(2)
 393 show_mode(3)
 394
 395 static ssize_t store_engine_mode(struct device *dev,
 396                                  struct device_attribute *attr,
 397                                  const char *buf, size_t len, int nr)
 398 {
 399         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 400         struct lp55xx_chip *chip = led->chip;
 401         struct lp55xx_engine *engine = &chip->engines[nr - 1];
 402
 403         mutex_lock(&chip->lock);
 404
 405         chip->engine_idx = nr;
 406
 407         if (!strncmp(buf, "run", 3)) {
 408                 lp5523_run_engine(chip, true);
 409                 engine->mode = LP55XX_ENGINE_RUN;
 410         } else if (!strncmp(buf, "load", 4)) {
 411                 lp5523_stop_engine(chip);
 412                 lp5523_load_engine(chip);
 413                 engine->mode = LP55XX_ENGINE_LOAD;
 414         } else if (!strncmp(buf, "disabled", 8)) {
 415                 lp5523_stop_engine(chip);
 416                 engine->mode = LP55XX_ENGINE_DISABLED;
 417         }
 418
 419         mutex_unlock(&chip->lock);
 420
 421         return len;
 422 }
 423 store_mode(1)
 424 store_mode(2)
 425 store_mode(3)
 426
 427 static int lp5523_mux_parse(const char *buf, u16 *mux, size_t len)
 428 {
 429         u16 tmp_mux = 0;
 430         int i;
 431
 432         len = min_t(int, len, LP5523_MAX_LEDS);
 433
 434         for (i = 0; i < len; i++) {
 435                 switch (buf[i]) {
 436                 case '1':
 437                         tmp_mux |= (1 << i);
 438                         break;
 439                 case '0':
 440                         break;
 441                 case '\n':
 442                         i = len;
 443                         break;
 444                 default:
 445                         return -1;
 446                 }
 447         }
 448         *mux = tmp_mux;
 449
 450         return 0;
 451 }
 452
 453 static void lp5523_mux_to_array(u16 led_mux, char *array)
 454 {
 455         int i, pos = 0;
 456         for (i = 0; i < LP5523_MAX_LEDS; i++)
 457                 pos += sprintf(array + pos, "%x", LED_ACTIVE(led_mux, i));
 458
 459         array[pos] = '\0';
 460 }
 461
 462 static ssize_t show_engine_leds(struct device *dev,
 463                             struct device_attribute *attr,
 464                             char *buf, int nr)
 465 {
 466         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 467         struct lp55xx_chip *chip = led->chip;
 468         char mux[LP5523_MAX_LEDS + 1];
 469
 470         lp5523_mux_to_array(chip->engines[nr - 1].led_mux, mux);
 471
 472         return sprintf(buf, "%s\n", mux);
 473 }
 474 show_leds(1)
 475 show_leds(2)
 476 show_leds(3)
 477
 478 static int lp5523_load_mux(struct lp55xx_chip *chip, u16 mux, int nr)
 479 {
 480         struct lp55xx_engine *engine = &chip->engines[nr - 1];
 481         int ret;
 482         u8 mux_page[] = {
 483                 [LP55XX_ENGINE_1] = LP5523_PAGE_MUX1,
 484                 [LP55XX_ENGINE_2] = LP5523_PAGE_MUX2,
 485                 [LP55XX_ENGINE_3] = LP5523_PAGE_MUX3,
 486         };
 487
 488         lp5523_load_engine(chip);
 489
 490         ret = lp55xx_write(chip, LP5523_REG_PROG_PAGE_SEL, mux_page[nr]);
 491         if (ret)
 492                 return ret;
 493
 494         ret = lp55xx_write(chip, LP5523_REG_PROG_MEM , (u8)(mux >> 8));
 495         if (ret)
 496                 return ret;
 497
 498         ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + 1, (u8)(mux));
 499         if (ret)
 500                 return ret;
 501
 502         engine->led_mux = mux;
 503         return 0;
 504 }
 505
 506 static ssize_t store_engine_leds(struct device *dev,
 507                              struct device_attribute *attr,
 508                              const char *buf, size_t len, int nr)
 509 {
 510         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 511         struct lp55xx_chip *chip = led->chip;
 512         struct lp55xx_engine *engine = &chip->engines[nr - 1];
 513         u16 mux = 0;
 514         ssize_t ret;
 515
 516         if (lp5523_mux_parse(buf, &mux, len))
 517                 return -EINVAL;
 518
 519         mutex_lock(&chip->lock);
 520
 521         chip->engine_idx = nr;
 522         ret = -EINVAL;
 523
 524         if (engine->mode != LP55XX_ENGINE_LOAD)
 525                 goto leave;
 526
 527         if (lp5523_load_mux(chip, mux, nr))
 528                 goto leave;
 529
 530         ret = len;
 531 leave:
 532         mutex_unlock(&chip->lock);
 533         return ret;
 534 }
 535 store_leds(1)
 536 store_leds(2)
 537 store_leds(3)
 538
 539 static ssize_t store_engine_load(struct device *dev,
 540                              struct device_attribute *attr,
 541                              const char *buf, size_t len, int nr)
 542 {
 543         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 544         struct lp55xx_chip *chip = led->chip;
 545         int ret;
 546
 547         mutex_lock(&chip->lock);
 548
 549         chip->engine_idx = nr;
 550         lp5523_load_engine_and_select_page(chip);
 551         ret = lp5523_update_program_memory(chip, buf, len);
 552
 553         mutex_unlock(&chip->lock);
 554
 555         return ret;
 556 }
 557 store_load(1)
 558 store_load(2)
 559 store_load(3)
 560
 561 static ssize_t lp5523_selftest(struct device *dev,
 562                                struct device_attribute *attr,
 563                                char *buf)
 564 {
 565         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 566         struct lp55xx_chip *chip = led->chip;
 567         struct lp55xx_platform_data *pdata = chip->pdata;
 568         int i, ret, pos = 0;
 569         u8 status, adc, vdd;
 570
 571         mutex_lock(&chip->lock);
 572
 573         ret = lp55xx_read(chip, LP5523_REG_STATUS, &status);
 574         if (ret < 0)
 575                 goto fail;
 576
 577         /* Check that ext clock is really in use if requested */
 578         if (pdata->clock_mode == LP55XX_CLOCK_EXT) {
 579                 if  ((status & LP5523_EXT_CLK_USED) == 0)
 580                         goto fail;
 581         }
 582
 583         /* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */
 584         lp55xx_write(chip, LP5523_REG_LED_TEST_CTRL, LP5523_EN_LEDTEST | 16);
 585         usleep_range(3000, 6000); /* ADC conversion time is typically 2.7 ms */
 586         ret = lp55xx_read(chip, LP5523_REG_STATUS, &status);
 587         if (ret < 0)
 588                 goto fail;
 589
 590         if (!(status & LP5523_LEDTEST_DONE))
 591                 usleep_range(3000, 6000); /* Was not ready. Wait little bit */
 592
 593         ret = lp55xx_read(chip, LP5523_REG_LED_TEST_ADC, &vdd);
 594         if (ret < 0)
 595                 goto fail;
 596
 597         vdd--;  /* There may be some fluctuation in measurement */
 598
 599         for (i = 0; i < LP5523_MAX_LEDS; i++) {
 600                 /* Skip non-existing channels */
 601                 if (pdata->led_config[i].led_current == 0)
 602                         continue;
 603
 604                 /* Set default current */
 605                 lp55xx_write(chip, LP5523_REG_LED_CURRENT_BASE + i,
 606                         pdata->led_config[i].led_current);
 607
 608                 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0xff);
 609                 /* let current stabilize 2 - 4ms before measurements start */
 610                 usleep_range(2000, 4000);
 611                 lp55xx_write(chip, LP5523_REG_LED_TEST_CTRL,
 612                              LP5523_EN_LEDTEST | i);
 613                 /* ADC conversion time is 2.7 ms typically */
 614                 usleep_range(3000, 6000);
 615                 ret = lp55xx_read(chip, LP5523_REG_STATUS, &status);
 616                 if (ret < 0)
 617                         goto fail;
 618
 619                 if (!(status & LP5523_LEDTEST_DONE))
 620                         usleep_range(3000, 6000);/* Was not ready. Wait. */
 621
 622                 ret = lp55xx_read(chip, LP5523_REG_LED_TEST_ADC, &adc);
 623                 if (ret < 0)
 624                         goto fail;
 625
 626                 if (adc >= vdd || adc < LP5523_ADC_SHORTCIRC_LIM)
 627                         pos += sprintf(buf + pos, "LED %d FAIL\n", i);
 628
 629                 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0x00);
 630
 631                 /* Restore current */
 632                 lp55xx_write(chip, LP5523_REG_LED_CURRENT_BASE + i,
 633                         led->led_current);
 634                 led++;
 635         }
 636         if (pos == 0)
 637                 pos = sprintf(buf, "OK\n");
 638         goto release_lock;
 639 fail:
 640         pos = sprintf(buf, "FAIL\n");
 641
 642 release_lock:
 643         mutex_unlock(&chip->lock);
 644
 645         return pos;
 646 }
 647
 648 static void lp5523_led_brightness_work(struct work_struct *work)
 649 {
 650         struct lp55xx_led *led = container_of(work, struct lp55xx_led,
 651                                               brightness_work);
 652         struct lp55xx_chip *chip = led->chip;
 653
 654         mutex_lock(&chip->lock);
 655         lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + led->chan_nr,
 656                      led->brightness);
 657         mutex_unlock(&chip->lock);
 658 }
 659
 660 static LP55XX_DEV_ATTR_RW(engine1_mode, show_engine1_mode, store_engine1_mode);
 661 static LP55XX_DEV_ATTR_RW(engine2_mode, show_engine2_mode, store_engine2_mode);
 662 static LP55XX_DEV_ATTR_RW(engine3_mode, show_engine3_mode, store_engine3_mode);
 663 static LP55XX_DEV_ATTR_RW(engine1_leds, show_engine1_leds, store_engine1_leds);
 664 static LP55XX_DEV_ATTR_RW(engine2_leds, show_engine2_leds, store_engine2_leds);
 665 static LP55XX_DEV_ATTR_RW(engine3_leds, show_engine3_leds, store_engine3_leds);
 666 static LP55XX_DEV_ATTR_WO(engine1_load, store_engine1_load);
 667 static LP55XX_DEV_ATTR_WO(engine2_load, store_engine2_load);
 668 static LP55XX_DEV_ATTR_WO(engine3_load, store_engine3_load);
 669 static LP55XX_DEV_ATTR_RO(selftest, lp5523_selftest);
 670
 671 static struct attribute *lp5523_attributes[] = {
 672         &dev_attr_engine1_mode.attr,
 673         &dev_attr_engine2_mode.attr,
 674         &dev_attr_engine3_mode.attr,
 675         &dev_attr_engine1_load.attr,
 676         &dev_attr_engine2_load.attr,
 677         &dev_attr_engine3_load.attr,
 678         &dev_attr_engine1_leds.attr,
 679         &dev_attr_engine2_leds.attr,
 680         &dev_attr_engine3_leds.attr,
 681         &dev_attr_selftest.attr,
 682         NULL,
 683 };
 684
 685 static const struct attribute_group lp5523_group = {
 686         .attrs = lp5523_attributes,
 687 };
 688
 689 /* Chip specific configurations */
 690 static struct lp55xx_device_config lp5523_cfg = {
 691         .reset = {
 692                 .addr = LP5523_REG_RESET,
 693                 .val  = LP5523_RESET,
 694         },
 695         .enable = {
 696                 .addr = LP5523_REG_ENABLE,
 697                 .val  = LP5523_ENABLE,
 698         },
 699         .max_channel  = LP5523_MAX_LEDS,
 700         .post_init_device   = lp5523_post_init_device,
 701         .brightness_work_fn = lp5523_led_brightness_work,
 702         .set_led_current    = lp5523_set_led_current,
 703         .firmware_cb        = lp5523_firmware_loaded,
 704         .run_engine         = lp5523_run_engine,
 705         .dev_attr_group     = &lp5523_group,
 706 };
 707
 708 static int lp5523_probe(struct i2c_client *client,
 709                         const struct i2c_device_id *id)
 710 {
 711         int ret;
 712         struct lp55xx_chip *chip;
 713         struct lp55xx_led *led;
 714         struct lp55xx_platform_data *pdata;
 715         struct device_node *np = client->dev.of_node;
 716
 717         if (!dev_get_platdata(&client->dev)) {
 718                 if (np) {
 719                         ret = lp55xx_of_populate_pdata(&client->dev, np);
 720                         if (ret < 0)
 721                                 return ret;
 722                 } else {
 723                         dev_err(&client->dev, "no platform data\n");
 724                         return -EINVAL;
 725                 }
 726         }
 727         pdata = dev_get_platdata(&client->dev);
 728
 729         chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
 730         if (!chip)
 731                 return -ENOMEM;
 732
 733         led = devm_kzalloc(&client->dev,
 734                         sizeof(*led) * pdata->num_channels, GFP_KERNEL);
 735         if (!led)
 736                 return -ENOMEM;
 737
 738         chip->cl = client;
 739         chip->pdata = pdata;
 740         chip->cfg = &lp5523_cfg;
 741
 742         mutex_init(&chip->lock);
 743
 744         i2c_set_clientdata(client, led);
 745
 746         ret = lp55xx_init_device(chip);
 747         if (ret)
 748                 goto err_init;
 749
 750         dev_info(&client->dev, "%s Programmable led chip found\n", id->name);
 751
 752         ret = lp55xx_register_leds(led, chip);
 753         if (ret)
 754                 goto err_register_leds;
 755
 756         ret = lp55xx_register_sysfs(chip);
 757         if (ret) {
 758                 dev_err(&client->dev, "registering sysfs failed\n");
 759                 goto err_register_sysfs;
 760         }
 761
 762         return 0;
 763
 764 err_register_sysfs:
 765         lp55xx_unregister_leds(led, chip);
 766 err_register_leds:
 767         lp55xx_deinit_device(chip);
 768 err_init:
 769         return ret;
 770 }
 771
 772 static int lp5523_remove(struct i2c_client *client)
 773 {
 774         struct lp55xx_led *led = i2c_get_clientdata(client);
 775         struct lp55xx_chip *chip = led->chip;
 776
 777         lp5523_stop_engine(chip);
 778         lp55xx_unregister_sysfs(chip);
 779         lp55xx_unregister_leds(led, chip);
 780         lp55xx_deinit_device(chip);
 781
 782         return 0;
 783 }
 784
 785 static const struct i2c_device_id lp5523_id[] = {
 786         { "lp5523",  LP5523 },
 787         { "lp55231", LP55231 },
 788         { }
 789 };
 790
 791 MODULE_DEVICE_TABLE(i2c, lp5523_id);
 792
 793 #ifdef CONFIG_OF
 794 static const struct of_device_id of_lp5523_leds_match[] = {
 795         { .compatible = "national,lp5523", },
 796         {},
 797 };
 798
 799 MODULE_DEVICE_TABLE(of, of_lp5523_leds_match);
 800 #endif
 801
 802 static struct i2c_driver lp5523_driver = {
 803         .driver = {
 804                 .name   = "lp5523x",
 805                 .of_match_table = of_match_ptr(of_lp5523_leds_match),
 806         },
 807         .probe          = lp5523_probe,
 808         .remove         = lp5523_remove,
 809         .id_table       = lp5523_id,
 810 };
 811
 812 module_i2c_driver(lp5523_driver);
 813
 814 MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>");
 815 MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
 816 MODULE_DESCRIPTION("LP5523 LED engine");
 817 MODULE_LICENSE("GPL");