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      /* bytes */
  39 /* Memory is used like this:
  40    0x00 engine 1 program
  41    0x10 engine 2 program
  42    0x20 engine 3 program
  43    0x30 engine 1 muxing info
  44    0x40 engine 2 muxing info
  45    0x50 engine 3 muxing info
  46 */
  47 #define LP5523_MAX_LEDS                 9
  48
  49 /* Registers */
  50 #define LP5523_REG_ENABLE               0x00
  51 #define LP5523_REG_OP_MODE              0x01
  52 #define LP5523_REG_ENABLE_LEDS_MSB      0x04
  53 #define LP5523_REG_ENABLE_LEDS_LSB      0x05
  54 #define LP5523_REG_LED_PWM_BASE         0x16
  55 #define LP5523_REG_LED_CURRENT_BASE     0x26
  56 #define LP5523_REG_CONFIG               0x36
  57 #define LP5523_REG_STATUS               0x3A
  58 #define LP5523_REG_RESET                0x3D
  59 #define LP5523_REG_LED_TEST_CTRL        0x41
  60 #define LP5523_REG_LED_TEST_ADC         0x42
  61 #define LP5523_REG_CH1_PROG_START       0x4C
  62 #define LP5523_REG_CH2_PROG_START       0x4D
  63 #define LP5523_REG_CH3_PROG_START       0x4E
  64 #define LP5523_REG_PROG_PAGE_SEL        0x4F
  65 #define LP5523_REG_PROG_MEM             0x50
  66
  67 /* Bit description in registers */
  68 #define LP5523_ENABLE                   0x40
  69 #define LP5523_AUTO_INC                 0x40
  70 #define LP5523_PWR_SAVE                 0x20
  71 #define LP5523_PWM_PWR_SAVE             0x04
  72 #define LP5523_CP_AUTO                  0x18
  73 #define LP5523_AUTO_CLK                 0x02
  74
  75 #define LP5523_EN_LEDTEST               0x80
  76 #define LP5523_LEDTEST_DONE             0x80
  77 #define LP5523_RESET                    0xFF
  78 #define LP5523_ADC_SHORTCIRC_LIM        80
  79 #define LP5523_EXT_CLK_USED             0x08
  80 #define LP5523_ENG_STATUS_MASK          0x07
  81
  82 /* Memory Page Selection */
  83 #define LP5523_PAGE_ENG1                0
  84 #define LP5523_PAGE_ENG2                1
  85 #define LP5523_PAGE_ENG3                2
  86 #define LP5523_PAGE_MUX1                3
  87 #define LP5523_PAGE_MUX2                4
  88 #define LP5523_PAGE_MUX3                5
  89
  90 /* Program Memory Operations */
  91 #define LP5523_MODE_ENG1_M              0x30    /* Operation Mode Register */
  92 #define LP5523_MODE_ENG2_M              0x0C
  93 #define LP5523_MODE_ENG3_M              0x03
  94 #define LP5523_LOAD_ENG1                0x10
  95 #define LP5523_LOAD_ENG2                0x04
  96 #define LP5523_LOAD_ENG3                0x01
  97
  98 #define LP5523_ENG1_IS_LOADING(mode)    \
  99         ((mode & LP5523_MODE_ENG1_M) == LP5523_LOAD_ENG1)
 100 #define LP5523_ENG2_IS_LOADING(mode)    \
 101         ((mode & LP5523_MODE_ENG2_M) == LP5523_LOAD_ENG2)
 102 #define LP5523_ENG3_IS_LOADING(mode)    \
 103         ((mode & LP5523_MODE_ENG3_M) == LP5523_LOAD_ENG3)
 104
 105 #define LP5523_EXEC_ENG1_M              0x30    /* Enable Register */
 106 #define LP5523_EXEC_ENG2_M              0x0C
 107 #define LP5523_EXEC_ENG3_M              0x03
 108 #define LP5523_EXEC_M                   0x3F
 109 #define LP5523_RUN_ENG1                 0x20
 110 #define LP5523_RUN_ENG2                 0x08
 111 #define LP5523_RUN_ENG3                 0x02
 112
 113 #define LED_ACTIVE(mux, led)            (!!(mux & (0x0001 << led)))
 114
 115 enum lp5523_chip_id {
 116         LP5523,
 117         LP55231,
 118 };
 119
 120 static int lp5523_init_program_engine(struct lp55xx_chip *chip);
 121
 122 static inline void lp5523_wait_opmode_done(void)
 123 {
 124         usleep_range(1000, 2000);
 125 }
 126
 127 static void lp5523_set_led_current(struct lp55xx_led *led, u8 led_current)
 128 {
 129         led->led_current = led_current;
 130         lp55xx_write(led->chip, LP5523_REG_LED_CURRENT_BASE + led->chan_nr,
 131                 led_current);
 132 }
 133
 134 static int lp5523_post_init_device(struct lp55xx_chip *chip)
 135 {
 136         int ret;
 137
 138         ret = lp55xx_write(chip, LP5523_REG_ENABLE, LP5523_ENABLE);
 139         if (ret)
 140                 return ret;
 141
 142         /* Chip startup time is 500 us, 1 - 2 ms gives some margin */
 143         usleep_range(1000, 2000);
 144
 145         ret = lp55xx_write(chip, LP5523_REG_CONFIG,
 146                             LP5523_AUTO_INC | LP5523_PWR_SAVE |
 147                             LP5523_CP_AUTO | LP5523_AUTO_CLK |
 148                             LP5523_PWM_PWR_SAVE);
 149         if (ret)
 150                 return ret;
 151
 152         /* turn on all leds */
 153         ret = lp55xx_write(chip, LP5523_REG_ENABLE_LEDS_MSB, 0x01);
 154         if (ret)
 155                 return ret;
 156
 157         ret = lp55xx_write(chip, LP5523_REG_ENABLE_LEDS_LSB, 0xff);
 158         if (ret)
 159                 return ret;
 160
 161         return lp5523_init_program_engine(chip);
 162 }
 163
 164 static void lp5523_load_engine(struct lp55xx_chip *chip)
 165 {
 166         enum lp55xx_engine_index idx = chip->engine_idx;
 167         u8 mask[] = {
 168                 [LP55XX_ENGINE_1] = LP5523_MODE_ENG1_M,
 169                 [LP55XX_ENGINE_2] = LP5523_MODE_ENG2_M,
 170                 [LP55XX_ENGINE_3] = LP5523_MODE_ENG3_M,
 171         };
 172
 173         u8 val[] = {
 174                 [LP55XX_ENGINE_1] = LP5523_LOAD_ENG1,
 175                 [LP55XX_ENGINE_2] = LP5523_LOAD_ENG2,
 176                 [LP55XX_ENGINE_3] = LP5523_LOAD_ENG3,
 177         };
 178
 179         lp55xx_update_bits(chip, LP5523_REG_OP_MODE, mask[idx], val[idx]);
 180
 181         lp5523_wait_opmode_done();
 182 }
 183
 184 static void lp5523_load_engine_and_select_page(struct lp55xx_chip *chip)
 185 {
 186         enum lp55xx_engine_index idx = chip->engine_idx;
 187         u8 page_sel[] = {
 188                 [LP55XX_ENGINE_1] = LP5523_PAGE_ENG1,
 189                 [LP55XX_ENGINE_2] = LP5523_PAGE_ENG2,
 190                 [LP55XX_ENGINE_3] = LP5523_PAGE_ENG3,
 191         };
 192
 193         lp5523_load_engine(chip);
 194
 195         lp55xx_write(chip, LP5523_REG_PROG_PAGE_SEL, page_sel[idx]);
 196 }
 197
 198 static void lp5523_stop_all_engines(struct lp55xx_chip *chip)
 199 {
 200         lp55xx_write(chip, LP5523_REG_OP_MODE, 0);
 201         lp5523_wait_opmode_done();
 202 }
 203
 204 static void lp5523_stop_engine(struct lp55xx_chip *chip)
 205 {
 206         enum lp55xx_engine_index idx = chip->engine_idx;
 207         u8 mask[] = {
 208                 [LP55XX_ENGINE_1] = LP5523_MODE_ENG1_M,
 209                 [LP55XX_ENGINE_2] = LP5523_MODE_ENG2_M,
 210                 [LP55XX_ENGINE_3] = LP5523_MODE_ENG3_M,
 211         };
 212
 213         lp55xx_update_bits(chip, LP5523_REG_OP_MODE, mask[idx], 0);
 214
 215         lp5523_wait_opmode_done();
 216 }
 217
 218 static void lp5523_turn_off_channels(struct lp55xx_chip *chip)
 219 {
 220         int i;
 221
 222         for (i = 0; i < LP5523_MAX_LEDS; i++)
 223                 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0);
 224 }
 225
 226 static void lp5523_run_engine(struct lp55xx_chip *chip, bool start)
 227 {
 228         int ret;
 229         u8 mode;
 230         u8 exec;
 231
 232         /* stop engine */
 233         if (!start) {
 234                 lp5523_stop_engine(chip);
 235                 lp5523_turn_off_channels(chip);
 236                 return;
 237         }
 238
 239         /*
 240          * To run the engine,
 241          * operation mode and enable register should updated at the same time
 242          */
 243
 244         ret = lp55xx_read(chip, LP5523_REG_OP_MODE, &mode);
 245         if (ret)
 246                 return;
 247
 248         ret = lp55xx_read(chip, LP5523_REG_ENABLE, &exec);
 249         if (ret)
 250                 return;
 251
 252         /* change operation mode to RUN only when each engine is loading */
 253         if (LP5523_ENG1_IS_LOADING(mode)) {
 254                 mode = (mode & ~LP5523_MODE_ENG1_M) | LP5523_RUN_ENG1;
 255                 exec = (exec & ~LP5523_EXEC_ENG1_M) | LP5523_RUN_ENG1;
 256         }
 257
 258         if (LP5523_ENG2_IS_LOADING(mode)) {
 259                 mode = (mode & ~LP5523_MODE_ENG2_M) | LP5523_RUN_ENG2;
 260                 exec = (exec & ~LP5523_EXEC_ENG2_M) | LP5523_RUN_ENG2;
 261         }
 262
 263         if (LP5523_ENG3_IS_LOADING(mode)) {
 264                 mode = (mode & ~LP5523_MODE_ENG3_M) | LP5523_RUN_ENG3;
 265                 exec = (exec & ~LP5523_EXEC_ENG3_M) | LP5523_RUN_ENG3;
 266         }
 267
 268         lp55xx_write(chip, LP5523_REG_OP_MODE, mode);
 269         lp5523_wait_opmode_done();
 270
 271         lp55xx_update_bits(chip, LP5523_REG_ENABLE, LP5523_EXEC_M, exec);
 272 }
 273
 274 static int lp5523_init_program_engine(struct lp55xx_chip *chip)
 275 {
 276         int i;
 277         int j;
 278         int ret;
 279         u8 status;
 280         /* one pattern per engine setting LED MUX start and stop addresses */
 281         static const u8 pattern[][LP5523_PROGRAM_LENGTH] =  {
 282                 { 0x9c, 0x30, 0x9c, 0xb0, 0x9d, 0x80, 0xd8, 0x00, 0},
 283                 { 0x9c, 0x40, 0x9c, 0xc0, 0x9d, 0x80, 0xd8, 0x00, 0},
 284                 { 0x9c, 0x50, 0x9c, 0xd0, 0x9d, 0x80, 0xd8, 0x00, 0},
 285         };
 286
 287         /* hardcode 32 bytes of memory for each engine from program memory */
 288         ret = lp55xx_write(chip, LP5523_REG_CH1_PROG_START, 0x00);
 289         if (ret)
 290                 return ret;
 291
 292         ret = lp55xx_write(chip, LP5523_REG_CH2_PROG_START, 0x10);
 293         if (ret)
 294                 return ret;
 295
 296         ret = lp55xx_write(chip, LP5523_REG_CH3_PROG_START, 0x20);
 297         if (ret)
 298                 return ret;
 299
 300         /* write LED MUX address space for each engine */
 301         for (i = LP55XX_ENGINE_1; i <= LP55XX_ENGINE_3; i++) {
 302                 chip->engine_idx = i;
 303                 lp5523_load_engine_and_select_page(chip);
 304
 305                 for (j = 0; j < LP5523_PROGRAM_LENGTH; j++) {
 306                         ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + j,
 307                                         pattern[i - 1][j]);
 308                         if (ret)
 309                                 goto out;
 310                 }
 311         }
 312
 313         lp5523_run_engine(chip, true);
 314
 315         /* Let the programs run for couple of ms and check the engine status */
 316         usleep_range(3000, 6000);
 317         lp55xx_read(chip, LP5523_REG_STATUS, &status);
 318         status &= LP5523_ENG_STATUS_MASK;
 319
 320         if (status != LP5523_ENG_STATUS_MASK) {
 321                 dev_err(&chip->cl->dev,
 322                         "cound not configure LED engine, status = 0x%.2x\n",
 323                         status);
 324                 ret = -1;
 325         }
 326
 327 out:
 328         lp5523_stop_all_engines(chip);
 329         return ret;
 330 }
 331
 332 static int lp5523_update_program_memory(struct lp55xx_chip *chip,
 333                                         const u8 *data, size_t size)
 334 {
 335         u8 pattern[LP5523_PROGRAM_LENGTH] = {0};
 336         unsigned cmd;
 337         char c[3];
 338         int nrchars;
 339         int ret;
 340         int offset = 0;
 341         int i = 0;
 342
 343         while ((offset < size - 1) && (i < LP5523_PROGRAM_LENGTH)) {
 344                 /* separate sscanfs because length is working only for %s */
 345                 ret = sscanf(data + offset, "%2s%n ", c, &nrchars);
 346                 if (ret != 1)
 347                         goto err;
 348
 349                 ret = sscanf(c, "%2x", &cmd);
 350                 if (ret != 1)
 351                         goto err;
 352
 353                 pattern[i] = (u8)cmd;
 354                 offset += nrchars;
 355                 i++;
 356         }
 357
 358         /* Each instruction is 16bit long. Check that length is even */
 359         if (i % 2)
 360                 goto err;
 361
 362         for (i = 0; i < LP5523_PROGRAM_LENGTH; i++) {
 363                 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + i, pattern[i]);
 364                 if (ret)
 365                         return -EINVAL;
 366         }
 367
 368         return size;
 369
 370 err:
 371         dev_err(&chip->cl->dev, "wrong pattern format\n");
 372         return -EINVAL;
 373 }
 374
 375 static void lp5523_firmware_loaded(struct lp55xx_chip *chip)
 376 {
 377         const struct firmware *fw = chip->fw;
 378
 379         if (fw->size > LP5523_PROGRAM_LENGTH) {
 380                 dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n",
 381                         fw->size);
 382                 return;
 383         }
 384
 385         /*
 386          * Program momery sequence
 387          *  1) set engine mode to "LOAD"
 388          *  2) write firmware data into program memory
 389          */
 390
 391         lp5523_load_engine_and_select_page(chip);
 392         lp5523_update_program_memory(chip, fw->data, fw->size);
 393 }
 394
 395 static ssize_t show_engine_mode(struct device *dev,
 396                                 struct device_attribute *attr,
 397                                 char *buf, int nr)
 398 {
 399         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 400         struct lp55xx_chip *chip = led->chip;
 401         enum lp55xx_engine_mode mode = chip->engines[nr - 1].mode;
 402
 403         switch (mode) {
 404         case LP55XX_ENGINE_RUN:
 405                 return sprintf(buf, "run\n");
 406         case LP55XX_ENGINE_LOAD:
 407                 return sprintf(buf, "load\n");
 408         case LP55XX_ENGINE_DISABLED:
 409         default:
 410                 return sprintf(buf, "disabled\n");
 411         }
 412 }
 413 show_mode(1)
 414 show_mode(2)
 415 show_mode(3)
 416
 417 static ssize_t store_engine_mode(struct device *dev,
 418                                  struct device_attribute *attr,
 419                                  const char *buf, size_t len, int nr)
 420 {
 421         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 422         struct lp55xx_chip *chip = led->chip;
 423         struct lp55xx_engine *engine = &chip->engines[nr - 1];
 424
 425         mutex_lock(&chip->lock);
 426
 427         chip->engine_idx = nr;
 428
 429         if (!strncmp(buf, "run", 3)) {
 430                 lp5523_run_engine(chip, true);
 431                 engine->mode = LP55XX_ENGINE_RUN;
 432         } else if (!strncmp(buf, "load", 4)) {
 433                 lp5523_stop_engine(chip);
 434                 lp5523_load_engine(chip);
 435                 engine->mode = LP55XX_ENGINE_LOAD;
 436         } else if (!strncmp(buf, "disabled", 8)) {
 437                 lp5523_stop_engine(chip);
 438                 engine->mode = LP55XX_ENGINE_DISABLED;
 439         }
 440
 441         mutex_unlock(&chip->lock);
 442
 443         return len;
 444 }
 445 store_mode(1)
 446 store_mode(2)
 447 store_mode(3)
 448
 449 static int lp5523_mux_parse(const char *buf, u16 *mux, size_t len)
 450 {
 451         u16 tmp_mux = 0;
 452         int i;
 453
 454         len = min_t(int, len, LP5523_MAX_LEDS);
 455
 456         for (i = 0; i < len; i++) {
 457                 switch (buf[i]) {
 458                 case '1':
 459                         tmp_mux |= (1 << i);
 460                         break;
 461                 case '0':
 462                         break;
 463                 case '\n':
 464                         i = len;
 465                         break;
 466                 default:
 467                         return -1;
 468                 }
 469         }
 470         *mux = tmp_mux;
 471
 472         return 0;
 473 }
 474
 475 static void lp5523_mux_to_array(u16 led_mux, char *array)
 476 {
 477         int i, pos = 0;
 478         for (i = 0; i < LP5523_MAX_LEDS; i++)
 479                 pos += sprintf(array + pos, "%x", LED_ACTIVE(led_mux, i));
 480
 481         array[pos] = '\0';
 482 }
 483
 484 static ssize_t show_engine_leds(struct device *dev,
 485                             struct device_attribute *attr,
 486                             char *buf, int nr)
 487 {
 488         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 489         struct lp55xx_chip *chip = led->chip;
 490         char mux[LP5523_MAX_LEDS + 1];
 491
 492         lp5523_mux_to_array(chip->engines[nr - 1].led_mux, mux);
 493
 494         return sprintf(buf, "%s\n", mux);
 495 }
 496 show_leds(1)
 497 show_leds(2)
 498 show_leds(3)
 499
 500 static int lp5523_load_mux(struct lp55xx_chip *chip, u16 mux, int nr)
 501 {
 502         struct lp55xx_engine *engine = &chip->engines[nr - 1];
 503         int ret;
 504         u8 mux_page[] = {
 505                 [LP55XX_ENGINE_1] = LP5523_PAGE_MUX1,
 506                 [LP55XX_ENGINE_2] = LP5523_PAGE_MUX2,
 507                 [LP55XX_ENGINE_3] = LP5523_PAGE_MUX3,
 508         };
 509
 510         lp5523_load_engine(chip);
 511
 512         ret = lp55xx_write(chip, LP5523_REG_PROG_PAGE_SEL, mux_page[nr]);
 513         if (ret)
 514                 return ret;
 515
 516         ret = lp55xx_write(chip, LP5523_REG_PROG_MEM , (u8)(mux >> 8));
 517         if (ret)
 518                 return ret;
 519
 520         ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + 1, (u8)(mux));
 521         if (ret)
 522                 return ret;
 523
 524         engine->led_mux = mux;
 525         return 0;
 526 }
 527
 528 static ssize_t store_engine_leds(struct device *dev,
 529                              struct device_attribute *attr,
 530                              const char *buf, size_t len, int nr)
 531 {
 532         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 533         struct lp55xx_chip *chip = led->chip;
 534         struct lp55xx_engine *engine = &chip->engines[nr - 1];
 535         u16 mux = 0;
 536         ssize_t ret;
 537
 538         if (lp5523_mux_parse(buf, &mux, len))
 539                 return -EINVAL;
 540
 541         mutex_lock(&chip->lock);
 542
 543         chip->engine_idx = nr;
 544         ret = -EINVAL;
 545
 546         if (engine->mode != LP55XX_ENGINE_LOAD)
 547                 goto leave;
 548
 549         if (lp5523_load_mux(chip, mux, nr))
 550                 goto leave;
 551
 552         ret = len;
 553 leave:
 554         mutex_unlock(&chip->lock);
 555         return ret;
 556 }
 557 store_leds(1)
 558 store_leds(2)
 559 store_leds(3)
 560
 561 static ssize_t store_engine_load(struct device *dev,
 562                              struct device_attribute *attr,
 563                              const char *buf, size_t len, int nr)
 564 {
 565         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 566         struct lp55xx_chip *chip = led->chip;
 567         int ret;
 568
 569         mutex_lock(&chip->lock);
 570
 571         chip->engine_idx = nr;
 572         lp5523_load_engine_and_select_page(chip);
 573         ret = lp5523_update_program_memory(chip, buf, len);
 574
 575         mutex_unlock(&chip->lock);
 576
 577         return ret;
 578 }
 579 store_load(1)
 580 store_load(2)
 581 store_load(3)
 582
 583 static ssize_t lp5523_selftest(struct device *dev,
 584                                struct device_attribute *attr,
 585                                char *buf)
 586 {
 587         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 588         struct lp55xx_chip *chip = led->chip;
 589         struct lp55xx_platform_data *pdata = chip->pdata;
 590         int i, ret, pos = 0;
 591         u8 status, adc, vdd;
 592
 593         mutex_lock(&chip->lock);
 594
 595         ret = lp55xx_read(chip, LP5523_REG_STATUS, &status);
 596         if (ret < 0)
 597                 goto fail;
 598
 599         /* Check that ext clock is really in use if requested */
 600         if (pdata->clock_mode == LP55XX_CLOCK_EXT) {
 601                 if  ((status & LP5523_EXT_CLK_USED) == 0)
 602                         goto fail;
 603         }
 604
 605         /* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */
 606         lp55xx_write(chip, LP5523_REG_LED_TEST_CTRL, LP5523_EN_LEDTEST | 16);
 607         usleep_range(3000, 6000); /* ADC conversion time is typically 2.7 ms */
 608         ret = lp55xx_read(chip, LP5523_REG_STATUS, &status);
 609         if (ret < 0)
 610                 goto fail;
 611
 612         if (!(status & LP5523_LEDTEST_DONE))
 613                 usleep_range(3000, 6000); /* Was not ready. Wait little bit */
 614
 615         ret = lp55xx_read(chip, LP5523_REG_LED_TEST_ADC, &vdd);
 616         if (ret < 0)
 617                 goto fail;
 618
 619         vdd--;  /* There may be some fluctuation in measurement */
 620
 621         for (i = 0; i < LP5523_MAX_LEDS; i++) {
 622                 /* Skip non-existing channels */
 623                 if (pdata->led_config[i].led_current == 0)
 624                         continue;
 625
 626                 /* Set default current */
 627                 lp55xx_write(chip, LP5523_REG_LED_CURRENT_BASE + i,
 628                         pdata->led_config[i].led_current);
 629
 630                 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0xff);
 631                 /* let current stabilize 2 - 4ms before measurements start */
 632                 usleep_range(2000, 4000);
 633                 lp55xx_write(chip, LP5523_REG_LED_TEST_CTRL,
 634                              LP5523_EN_LEDTEST | i);
 635                 /* ADC conversion time is 2.7 ms typically */
 636                 usleep_range(3000, 6000);
 637                 ret = lp55xx_read(chip, LP5523_REG_STATUS, &status);
 638                 if (ret < 0)
 639                         goto fail;
 640
 641                 if (!(status & LP5523_LEDTEST_DONE))
 642                         usleep_range(3000, 6000);/* Was not ready. Wait. */
 643
 644                 ret = lp55xx_read(chip, LP5523_REG_LED_TEST_ADC, &adc);
 645                 if (ret < 0)
 646                         goto fail;
 647
 648                 if (adc >= vdd || adc < LP5523_ADC_SHORTCIRC_LIM)
 649                         pos += sprintf(buf + pos, "LED %d FAIL\n", i);
 650
 651                 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0x00);
 652
 653                 /* Restore current */
 654                 lp55xx_write(chip, LP5523_REG_LED_CURRENT_BASE + i,
 655                         led->led_current);
 656                 led++;
 657         }
 658         if (pos == 0)
 659                 pos = sprintf(buf, "OK\n");
 660         goto release_lock;
 661 fail:
 662         pos = sprintf(buf, "FAIL\n");
 663
 664 release_lock:
 665         mutex_unlock(&chip->lock);
 666
 667         return pos;
 668 }
 669
 670 static void lp5523_led_brightness_work(struct work_struct *work)
 671 {
 672         struct lp55xx_led *led = container_of(work, struct lp55xx_led,
 673                                               brightness_work);
 674         struct lp55xx_chip *chip = led->chip;
 675
 676         mutex_lock(&chip->lock);
 677         lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + led->chan_nr,
 678                      led->brightness);
 679         mutex_unlock(&chip->lock);
 680 }
 681
 682 static LP55XX_DEV_ATTR_RW(engine1_mode, show_engine1_mode, store_engine1_mode);
 683 static LP55XX_DEV_ATTR_RW(engine2_mode, show_engine2_mode, store_engine2_mode);
 684 static LP55XX_DEV_ATTR_RW(engine3_mode, show_engine3_mode, store_engine3_mode);
 685 static LP55XX_DEV_ATTR_RW(engine1_leds, show_engine1_leds, store_engine1_leds);
 686 static LP55XX_DEV_ATTR_RW(engine2_leds, show_engine2_leds, store_engine2_leds);
 687 static LP55XX_DEV_ATTR_RW(engine3_leds, show_engine3_leds, store_engine3_leds);
 688 static LP55XX_DEV_ATTR_WO(engine1_load, store_engine1_load);
 689 static LP55XX_DEV_ATTR_WO(engine2_load, store_engine2_load);
 690 static LP55XX_DEV_ATTR_WO(engine3_load, store_engine3_load);
 691 static LP55XX_DEV_ATTR_RO(selftest, lp5523_selftest);
 692
 693 static struct attribute *lp5523_attributes[] = {
 694         &dev_attr_engine1_mode.attr,
 695         &dev_attr_engine2_mode.attr,
 696         &dev_attr_engine3_mode.attr,
 697         &dev_attr_engine1_load.attr,
 698         &dev_attr_engine2_load.attr,
 699         &dev_attr_engine3_load.attr,
 700         &dev_attr_engine1_leds.attr,
 701         &dev_attr_engine2_leds.attr,
 702         &dev_attr_engine3_leds.attr,
 703         &dev_attr_selftest.attr,
 704         NULL,
 705 };
 706
 707 static const struct attribute_group lp5523_group = {
 708         .attrs = lp5523_attributes,
 709 };
 710
 711 /* Chip specific configurations */
 712 static struct lp55xx_device_config lp5523_cfg = {
 713         .reset = {
 714                 .addr = LP5523_REG_RESET,
 715                 .val  = LP5523_RESET,
 716         },
 717         .enable = {
 718                 .addr = LP5523_REG_ENABLE,
 719                 .val  = LP5523_ENABLE,
 720         },
 721         .max_channel  = LP5523_MAX_LEDS,
 722         .post_init_device   = lp5523_post_init_device,
 723         .brightness_work_fn = lp5523_led_brightness_work,
 724         .set_led_current    = lp5523_set_led_current,
 725         .firmware_cb        = lp5523_firmware_loaded,
 726         .run_engine         = lp5523_run_engine,
 727         .dev_attr_group     = &lp5523_group,
 728 };
 729
 730 static int lp5523_probe(struct i2c_client *client,
 731                         const struct i2c_device_id *id)
 732 {
 733         int ret;
 734         struct lp55xx_chip *chip;
 735         struct lp55xx_led *led;
 736         struct lp55xx_platform_data *pdata;
 737         struct device_node *np = client->dev.of_node;
 738
 739         if (!dev_get_platdata(&client->dev)) {
 740                 if (np) {
 741                         ret = lp55xx_of_populate_pdata(&client->dev, np);
 742                         if (ret < 0)
 743                                 return ret;
 744                 } else {
 745                         dev_err(&client->dev, "no platform data\n");
 746                         return -EINVAL;
 747                 }
 748         }
 749         pdata = dev_get_platdata(&client->dev);
 750
 751         chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
 752         if (!chip)
 753                 return -ENOMEM;
 754
 755         led = devm_kzalloc(&client->dev,
 756                         sizeof(*led) * pdata->num_channels, GFP_KERNEL);
 757         if (!led)
 758                 return -ENOMEM;
 759
 760         chip->cl = client;
 761         chip->pdata = pdata;
 762         chip->cfg = &lp5523_cfg;
 763
 764         mutex_init(&chip->lock);
 765
 766         i2c_set_clientdata(client, led);
 767
 768         ret = lp55xx_init_device(chip);
 769         if (ret)
 770                 goto err_init;
 771
 772         dev_info(&client->dev, "%s Programmable led chip found\n", id->name);
 773
 774         ret = lp55xx_register_leds(led, chip);
 775         if (ret)
 776                 goto err_register_leds;
 777
 778         ret = lp55xx_register_sysfs(chip);
 779         if (ret) {
 780                 dev_err(&client->dev, "registering sysfs failed\n");
 781                 goto err_register_sysfs;
 782         }
 783
 784         return 0;
 785
 786 err_register_sysfs:
 787         lp55xx_unregister_leds(led, chip);
 788 err_register_leds:
 789         lp55xx_deinit_device(chip);
 790 err_init:
 791         return ret;
 792 }
 793
 794 static int lp5523_remove(struct i2c_client *client)
 795 {
 796         struct lp55xx_led *led = i2c_get_clientdata(client);
 797         struct lp55xx_chip *chip = led->chip;
 798
 799         lp5523_stop_all_engines(chip);
 800         lp55xx_unregister_sysfs(chip);
 801         lp55xx_unregister_leds(led, chip);
 802         lp55xx_deinit_device(chip);
 803
 804         return 0;
 805 }
 806
 807 static const struct i2c_device_id lp5523_id[] = {
 808         { "lp5523",  LP5523 },
 809         { "lp55231", LP55231 },
 810         { }
 811 };
 812
 813 MODULE_DEVICE_TABLE(i2c, lp5523_id);
 814
 815 #ifdef CONFIG_OF
 816 static const struct of_device_id of_lp5523_leds_match[] = {
 817         { .compatible = "national,lp5523", },
 818         {},
 819 };
 820
 821 MODULE_DEVICE_TABLE(of, of_lp5523_leds_match);
 822 #endif
 823
 824 static struct i2c_driver lp5523_driver = {
 825         .driver = {
 826                 .name   = "lp5523x",
 827                 .of_match_table = of_match_ptr(of_lp5523_leds_match),
 828         },
 829         .probe          = lp5523_probe,
 830         .remove         = lp5523_remove,
 831         .id_table       = lp5523_id,
 832 };
 833
 834 module_i2c_driver(lp5523_driver);
 835
 836 MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>");
 837 MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
 838 MODULE_DESCRIPTION("LP5523 LED engine");
 839 MODULE_LICENSE("GPL");