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/platform_data/leds-lp55xx.h>
  33 #include <linux/slab.h>
  34
  35 #include "leds-lp55xx-common.h"
  36
  37 #define LP5523_PROGRAM_LENGTH           32
  38 #define LP5523_MAX_LEDS                 9
  39
  40 /* Registers */
  41 #define LP5523_REG_ENABLE               0x00
  42 #define LP5523_REG_OP_MODE              0x01
  43 #define LP5523_REG_ENABLE_LEDS_MSB      0x04
  44 #define LP5523_REG_ENABLE_LEDS_LSB      0x05
  45 #define LP5523_REG_LED_PWM_BASE         0x16
  46 #define LP5523_REG_LED_CURRENT_BASE     0x26
  47 #define LP5523_REG_CONFIG               0x36
  48 #define LP5523_REG_STATUS               0x3A
  49 #define LP5523_REG_RESET                0x3D
  50 #define LP5523_REG_LED_TEST_CTRL        0x41
  51 #define LP5523_REG_LED_TEST_ADC         0x42
  52 #define LP5523_REG_CH1_PROG_START       0x4C
  53 #define LP5523_REG_CH2_PROG_START       0x4D
  54 #define LP5523_REG_CH3_PROG_START       0x4E
  55 #define LP5523_REG_PROG_PAGE_SEL        0x4F
  56 #define LP5523_REG_PROG_MEM             0x50
  57
  58 /* Bit description in registers */
  59 #define LP5523_ENABLE                   0x40
  60 #define LP5523_AUTO_INC                 0x40
  61 #define LP5523_PWR_SAVE                 0x20
  62 #define LP5523_PWM_PWR_SAVE             0x04
  63 #define LP5523_CP_AUTO                  0x18
  64 #define LP5523_AUTO_CLK                 0x02
  65
  66 #define LP5523_EN_LEDTEST               0x80
  67 #define LP5523_LEDTEST_DONE             0x80
  68 #define LP5523_RESET                    0xFF
  69 #define LP5523_ADC_SHORTCIRC_LIM        80
  70 #define LP5523_EXT_CLK_USED             0x08
  71 #define LP5523_ENG_STATUS_MASK          0x07
  72
  73 /* Memory Page Selection */
  74 #define LP5523_PAGE_ENG1                0
  75 #define LP5523_PAGE_ENG2                1
  76 #define LP5523_PAGE_ENG3                2
  77 #define LP5523_PAGE_MUX1                3
  78 #define LP5523_PAGE_MUX2                4
  79 #define LP5523_PAGE_MUX3                5
  80
  81 /* Program Memory Operations */
  82 #define LP5523_MODE_ENG1_M              0x30    /* Operation Mode Register */
  83 #define LP5523_MODE_ENG2_M              0x0C
  84 #define LP5523_MODE_ENG3_M              0x03
  85 #define LP5523_LOAD_ENG1                0x10
  86 #define LP5523_LOAD_ENG2                0x04
  87 #define LP5523_LOAD_ENG3                0x01
  88
  89 #define LP5523_ENG1_IS_LOADING(mode)    \
  90         ((mode & LP5523_MODE_ENG1_M) == LP5523_LOAD_ENG1)
  91 #define LP5523_ENG2_IS_LOADING(mode)    \
  92         ((mode & LP5523_MODE_ENG2_M) == LP5523_LOAD_ENG2)
  93 #define LP5523_ENG3_IS_LOADING(mode)    \
  94         ((mode & LP5523_MODE_ENG3_M) == LP5523_LOAD_ENG3)
  95
  96 #define LP5523_EXEC_ENG1_M              0x30    /* Enable Register */
  97 #define LP5523_EXEC_ENG2_M              0x0C
  98 #define LP5523_EXEC_ENG3_M              0x03
  99 #define LP5523_EXEC_M                   0x3F
 100 #define LP5523_RUN_ENG1                 0x20
 101 #define LP5523_RUN_ENG2                 0x08
 102 #define LP5523_RUN_ENG3                 0x02
 103
 104 #define LED_ACTIVE(mux, led)            (!!(mux & (0x0001 << led)))
 105
 106 enum lp5523_chip_id {
 107         LP5523,
 108         LP55231,
 109 };
 110
 111 static int lp5523_init_program_engine(struct lp55xx_chip *chip);
 112
 113 static inline void lp5523_wait_opmode_done(void)
 114 {
 115         usleep_range(1000, 2000);
 116 }
 117
 118 static void lp5523_set_led_current(struct lp55xx_led *led, u8 led_current)
 119 {
 120         led->led_current = led_current;
 121         lp55xx_write(led->chip, LP5523_REG_LED_CURRENT_BASE + led->chan_nr,
 122                 led_current);
 123 }
 124
 125 static int lp5523_post_init_device(struct lp55xx_chip *chip)
 126 {
 127         int ret;
 128
 129         ret = lp55xx_write(chip, LP5523_REG_ENABLE, LP5523_ENABLE);
 130         if (ret)
 131                 return ret;
 132
 133         /* Chip startup time is 500 us, 1 - 2 ms gives some margin */
 134         usleep_range(1000, 2000);
 135
 136         ret = lp55xx_write(chip, LP5523_REG_CONFIG,
 137                             LP5523_AUTO_INC | LP5523_PWR_SAVE |
 138                             LP5523_CP_AUTO | LP5523_AUTO_CLK |
 139                             LP5523_PWM_PWR_SAVE);
 140         if (ret)
 141                 return ret;
 142
 143         /* turn on all leds */
 144         ret = lp55xx_write(chip, LP5523_REG_ENABLE_LEDS_MSB, 0x01);
 145         if (ret)
 146                 return ret;
 147
 148         ret = lp55xx_write(chip, LP5523_REG_ENABLE_LEDS_LSB, 0xff);
 149         if (ret)
 150                 return ret;
 151
 152         return lp5523_init_program_engine(chip);
 153 }
 154
 155 static void lp5523_load_engine(struct lp55xx_chip *chip)
 156 {
 157         enum lp55xx_engine_index idx = chip->engine_idx;
 158         u8 mask[] = {
 159                 [LP55XX_ENGINE_1] = LP5523_MODE_ENG1_M,
 160                 [LP55XX_ENGINE_2] = LP5523_MODE_ENG2_M,
 161                 [LP55XX_ENGINE_3] = LP5523_MODE_ENG3_M,
 162         };
 163
 164         u8 val[] = {
 165                 [LP55XX_ENGINE_1] = LP5523_LOAD_ENG1,
 166                 [LP55XX_ENGINE_2] = LP5523_LOAD_ENG2,
 167                 [LP55XX_ENGINE_3] = LP5523_LOAD_ENG3,
 168         };
 169
 170         lp55xx_update_bits(chip, LP5523_REG_OP_MODE, mask[idx], val[idx]);
 171
 172         lp5523_wait_opmode_done();
 173 }
 174
 175 static void lp5523_load_engine_and_select_page(struct lp55xx_chip *chip)
 176 {
 177         enum lp55xx_engine_index idx = chip->engine_idx;
 178         u8 page_sel[] = {
 179                 [LP55XX_ENGINE_1] = LP5523_PAGE_ENG1,
 180                 [LP55XX_ENGINE_2] = LP5523_PAGE_ENG2,
 181                 [LP55XX_ENGINE_3] = LP5523_PAGE_ENG3,
 182         };
 183
 184         lp5523_load_engine(chip);
 185
 186         lp55xx_write(chip, LP5523_REG_PROG_PAGE_SEL, page_sel[idx]);
 187 }
 188
 189 static void lp5523_stop_engine(struct lp55xx_chip *chip)
 190 {
 191         lp55xx_write(chip, LP5523_REG_OP_MODE, 0);
 192         lp5523_wait_opmode_done();
 193 }
 194
 195 static void lp5523_turn_off_channels(struct lp55xx_chip *chip)
 196 {
 197         int i;
 198
 199         for (i = 0; i < LP5523_MAX_LEDS; i++)
 200                 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0);
 201 }
 202
 203 static void lp5523_run_engine(struct lp55xx_chip *chip, bool start)
 204 {
 205         int ret;
 206         u8 mode;
 207         u8 exec;
 208
 209         /* stop engine */
 210         if (!start) {
 211                 lp5523_stop_engine(chip);
 212                 lp5523_turn_off_channels(chip);
 213                 return;
 214         }
 215
 216         /*
 217          * To run the engine,
 218          * operation mode and enable register should updated at the same time
 219          */
 220
 221         ret = lp55xx_read(chip, LP5523_REG_OP_MODE, &mode);
 222         if (ret)
 223                 return;
 224
 225         ret = lp55xx_read(chip, LP5523_REG_ENABLE, &exec);
 226         if (ret)
 227                 return;
 228
 229         /* change operation mode to RUN only when each engine is loading */
 230         if (LP5523_ENG1_IS_LOADING(mode)) {
 231                 mode = (mode & ~LP5523_MODE_ENG1_M) | LP5523_RUN_ENG1;
 232                 exec = (exec & ~LP5523_EXEC_ENG1_M) | LP5523_RUN_ENG1;
 233         }
 234
 235         if (LP5523_ENG2_IS_LOADING(mode)) {
 236                 mode = (mode & ~LP5523_MODE_ENG2_M) | LP5523_RUN_ENG2;
 237                 exec = (exec & ~LP5523_EXEC_ENG2_M) | LP5523_RUN_ENG2;
 238         }
 239
 240         if (LP5523_ENG3_IS_LOADING(mode)) {
 241                 mode = (mode & ~LP5523_MODE_ENG3_M) | LP5523_RUN_ENG3;
 242                 exec = (exec & ~LP5523_EXEC_ENG3_M) | LP5523_RUN_ENG3;
 243         }
 244
 245         lp55xx_write(chip, LP5523_REG_OP_MODE, mode);
 246         lp5523_wait_opmode_done();
 247
 248         lp55xx_update_bits(chip, LP5523_REG_ENABLE, LP5523_EXEC_M, exec);
 249 }
 250
 251 static int lp5523_init_program_engine(struct lp55xx_chip *chip)
 252 {
 253         int i;
 254         int j;
 255         int ret;
 256         u8 status;
 257         /* one pattern per engine setting LED MUX start and stop addresses */
 258         static const u8 pattern[][LP5523_PROGRAM_LENGTH] =  {
 259                 { 0x9c, 0x30, 0x9c, 0xb0, 0x9d, 0x80, 0xd8, 0x00, 0},
 260                 { 0x9c, 0x40, 0x9c, 0xc0, 0x9d, 0x80, 0xd8, 0x00, 0},
 261                 { 0x9c, 0x50, 0x9c, 0xd0, 0x9d, 0x80, 0xd8, 0x00, 0},
 262         };
 263
 264         /* hardcode 32 bytes of memory for each engine from program memory */
 265         ret = lp55xx_write(chip, LP5523_REG_CH1_PROG_START, 0x00);
 266         if (ret)
 267                 return ret;
 268
 269         ret = lp55xx_write(chip, LP5523_REG_CH2_PROG_START, 0x10);
 270         if (ret)
 271                 return ret;
 272
 273         ret = lp55xx_write(chip, LP5523_REG_CH3_PROG_START, 0x20);
 274         if (ret)
 275                 return ret;
 276
 277         /* write LED MUX address space for each engine */
 278         for (i = LP55XX_ENGINE_1; i <= LP55XX_ENGINE_3; i++) {
 279                 chip->engine_idx = i;
 280                 lp5523_load_engine_and_select_page(chip);
 281
 282                 for (j = 0; j < LP5523_PROGRAM_LENGTH; j++) {
 283                         ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + j,
 284                                         pattern[i - 1][j]);
 285                         if (ret)
 286                                 goto out;
 287                 }
 288         }
 289
 290         lp5523_run_engine(chip, true);
 291
 292         /* Let the programs run for couple of ms and check the engine status */
 293         usleep_range(3000, 6000);
 294         lp55xx_read(chip, LP5523_REG_STATUS, &status);
 295         status &= LP5523_ENG_STATUS_MASK;
 296
 297         if (status != LP5523_ENG_STATUS_MASK) {
 298                 dev_err(&chip->cl->dev,
 299                         "cound not configure LED engine, status = 0x%.2x\n",
 300                         status);
 301                 ret = -1;
 302         }
 303
 304 out:
 305         lp5523_stop_engine(chip);
 306         return ret;
 307 }
 308
 309 static int lp5523_update_program_memory(struct lp55xx_chip *chip,
 310                                         const u8 *data, size_t size)
 311 {
 312         u8 pattern[LP5523_PROGRAM_LENGTH] = {0};
 313         unsigned cmd;
 314         char c[3];
 315         int nrchars;
 316         int ret;
 317         int offset = 0;
 318         int i = 0;
 319
 320         while ((offset < size - 1) && (i < LP5523_PROGRAM_LENGTH)) {
 321                 /* separate sscanfs because length is working only for %s */
 322                 ret = sscanf(data + offset, "%2s%n ", c, &nrchars);
 323                 if (ret != 1)
 324                         goto err;
 325
 326                 ret = sscanf(c, "%2x", &cmd);
 327                 if (ret != 1)
 328                         goto err;
 329
 330                 pattern[i] = (u8)cmd;
 331                 offset += nrchars;
 332                 i++;
 333         }
 334
 335         /* Each instruction is 16bit long. Check that length is even */
 336         if (i % 2)
 337                 goto err;
 338
 339         mutex_lock(&chip->lock);
 340
 341         for (i = 0; i < LP5523_PROGRAM_LENGTH; i++) {
 342                 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + i, pattern[i]);
 343                 if (ret) {
 344                         mutex_unlock(&chip->lock);
 345                         return -EINVAL;
 346                 }
 347         }
 348
 349         mutex_unlock(&chip->lock);
 350
 351         return size;
 352
 353 err:
 354         dev_err(&chip->cl->dev, "wrong pattern format\n");
 355         return -EINVAL;
 356 }
 357
 358 static void lp5523_firmware_loaded(struct lp55xx_chip *chip)
 359 {
 360         const struct firmware *fw = chip->fw;
 361
 362         if (fw->size > LP5523_PROGRAM_LENGTH) {
 363                 dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n",
 364                         fw->size);
 365                 return;
 366         }
 367
 368         /*
 369          * Program momery sequence
 370          *  1) set engine mode to "LOAD"
 371          *  2) write firmware data into program memory
 372          */
 373
 374         lp5523_load_engine_and_select_page(chip);
 375         lp5523_update_program_memory(chip, fw->data, fw->size);
 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                 lp5523_run_engine(chip, true);
 414                 engine->mode = LP55XX_ENGINE_RUN;
 415         } else if (!strncmp(buf, "load", 4)) {
 416                 lp5523_stop_engine(chip);
 417                 lp5523_load_engine(chip);
 418                 engine->mode = LP55XX_ENGINE_LOAD;
 419         } else if (!strncmp(buf, "disabled", 8)) {
 420                 lp5523_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 int lp5523_mux_parse(const char *buf, u16 *mux, size_t len)
 433 {
 434         u16 tmp_mux = 0;
 435         int i;
 436
 437         len = min_t(int, len, LP5523_MAX_LEDS);
 438
 439         for (i = 0; i < len; i++) {
 440                 switch (buf[i]) {
 441                 case '1':
 442                         tmp_mux |= (1 << i);
 443                         break;
 444                 case '0':
 445                         break;
 446                 case '\n':
 447                         i = len;
 448                         break;
 449                 default:
 450                         return -1;
 451                 }
 452         }
 453         *mux = tmp_mux;
 454
 455         return 0;
 456 }
 457
 458 static void lp5523_mux_to_array(u16 led_mux, char *array)
 459 {
 460         int i, pos = 0;
 461         for (i = 0; i < LP5523_MAX_LEDS; i++)
 462                 pos += sprintf(array + pos, "%x", LED_ACTIVE(led_mux, i));
 463
 464         array[pos] = '\0';
 465 }
 466
 467 static ssize_t show_engine_leds(struct device *dev,
 468                             struct device_attribute *attr,
 469                             char *buf, int nr)
 470 {
 471         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 472         struct lp55xx_chip *chip = led->chip;
 473         char mux[LP5523_MAX_LEDS + 1];
 474
 475         lp5523_mux_to_array(chip->engines[nr - 1].led_mux, mux);
 476
 477         return sprintf(buf, "%s\n", mux);
 478 }
 479 show_leds(1)
 480 show_leds(2)
 481 show_leds(3)
 482
 483 static int lp5523_load_mux(struct lp55xx_chip *chip, u16 mux, int nr)
 484 {
 485         struct lp55xx_engine *engine = &chip->engines[nr - 1];
 486         int ret;
 487         u8 mux_page[] = {
 488                 [LP55XX_ENGINE_1] = LP5523_PAGE_MUX1,
 489                 [LP55XX_ENGINE_2] = LP5523_PAGE_MUX2,
 490                 [LP55XX_ENGINE_3] = LP5523_PAGE_MUX3,
 491         };
 492
 493         lp5523_load_engine(chip);
 494
 495         ret = lp55xx_write(chip, LP5523_REG_PROG_PAGE_SEL, mux_page[nr]);
 496         if (ret)
 497                 return ret;
 498
 499         ret = lp55xx_write(chip, LP5523_REG_PROG_MEM , (u8)(mux >> 8));
 500         if (ret)
 501                 return ret;
 502
 503         ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + 1, (u8)(mux));
 504         if (ret)
 505                 return ret;
 506
 507         engine->led_mux = mux;
 508         return 0;
 509 }
 510
 511 static ssize_t store_engine_leds(struct device *dev,
 512                              struct device_attribute *attr,
 513                              const char *buf, size_t len, int nr)
 514 {
 515         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 516         struct lp55xx_chip *chip = led->chip;
 517         struct lp55xx_engine *engine = &chip->engines[nr - 1];
 518         u16 mux = 0;
 519         ssize_t ret;
 520
 521         if (lp5523_mux_parse(buf, &mux, len))
 522                 return -EINVAL;
 523
 524         mutex_lock(&chip->lock);
 525
 526         chip->engine_idx = nr;
 527         ret = -EINVAL;
 528
 529         if (engine->mode != LP55XX_ENGINE_LOAD)
 530                 goto leave;
 531
 532         if (lp5523_load_mux(chip, mux, nr))
 533                 goto leave;
 534
 535         ret = len;
 536 leave:
 537         mutex_unlock(&chip->lock);
 538         return ret;
 539 }
 540 store_leds(1)
 541 store_leds(2)
 542 store_leds(3)
 543
 544 static ssize_t store_engine_load(struct device *dev,
 545                              struct device_attribute *attr,
 546                              const char *buf, size_t len, int nr)
 547 {
 548         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 549         struct lp55xx_chip *chip = led->chip;
 550
 551         mutex_lock(&chip->lock);
 552
 553         chip->engine_idx = nr;
 554         lp5523_load_engine_and_select_page(chip);
 555
 556         mutex_unlock(&chip->lock);
 557
 558         return lp5523_update_program_memory(chip, buf, len);
 559 }
 560 store_load(1)
 561 store_load(2)
 562 store_load(3)
 563
 564 static ssize_t lp5523_selftest(struct device *dev,
 565                                struct device_attribute *attr,
 566                                char *buf)
 567 {
 568         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 569         struct lp55xx_chip *chip = led->chip;
 570         struct lp55xx_platform_data *pdata = chip->pdata;
 571         int i, ret, pos = 0;
 572         u8 status, adc, vdd;
 573
 574         mutex_lock(&chip->lock);
 575
 576         ret = lp55xx_read(chip, LP5523_REG_STATUS, &status);
 577         if (ret < 0)
 578                 goto fail;
 579
 580         /* Check that ext clock is really in use if requested */
 581         if (pdata->clock_mode == LP55XX_CLOCK_EXT) {
 582                 if  ((status & LP5523_EXT_CLK_USED) == 0)
 583                         goto fail;
 584         }
 585
 586         /* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */
 587         lp55xx_write(chip, LP5523_REG_LED_TEST_CTRL, LP5523_EN_LEDTEST | 16);
 588         usleep_range(3000, 6000); /* ADC conversion time is typically 2.7 ms */
 589         ret = lp55xx_read(chip, LP5523_REG_STATUS, &status);
 590         if (ret < 0)
 591                 goto fail;
 592
 593         if (!(status & LP5523_LEDTEST_DONE))
 594                 usleep_range(3000, 6000); /* Was not ready. Wait little bit */
 595
 596         ret = lp55xx_read(chip, LP5523_REG_LED_TEST_ADC, &vdd);
 597         if (ret < 0)
 598                 goto fail;
 599
 600         vdd--;  /* There may be some fluctuation in measurement */
 601
 602         for (i = 0; i < LP5523_MAX_LEDS; i++) {
 603                 /* Skip non-existing channels */
 604                 if (pdata->led_config[i].led_current == 0)
 605                         continue;
 606
 607                 /* Set default current */
 608                 lp55xx_write(chip, LP5523_REG_LED_CURRENT_BASE + i,
 609                         pdata->led_config[i].led_current);
 610
 611                 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0xff);
 612                 /* let current stabilize 2 - 4ms before measurements start */
 613                 usleep_range(2000, 4000);
 614                 lp55xx_write(chip, LP5523_REG_LED_TEST_CTRL,
 615                              LP5523_EN_LEDTEST | i);
 616                 /* ADC conversion time is 2.7 ms typically */
 617                 usleep_range(3000, 6000);
 618                 ret = lp55xx_read(chip, LP5523_REG_STATUS, &status);
 619                 if (ret < 0)
 620                         goto fail;
 621
 622                 if (!(status & LP5523_LEDTEST_DONE))
 623                         usleep_range(3000, 6000);/* Was not ready. Wait. */
 624
 625                 ret = lp55xx_read(chip, LP5523_REG_LED_TEST_ADC, &adc);
 626                 if (ret < 0)
 627                         goto fail;
 628
 629                 if (adc >= vdd || adc < LP5523_ADC_SHORTCIRC_LIM)
 630                         pos += sprintf(buf + pos, "LED %d FAIL\n", i);
 631
 632                 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0x00);
 633
 634                 /* Restore current */
 635                 lp55xx_write(chip, LP5523_REG_LED_CURRENT_BASE + i,
 636                         led->led_current);
 637                 led++;
 638         }
 639         if (pos == 0)
 640                 pos = sprintf(buf, "OK\n");
 641         goto release_lock;
 642 fail:
 643         pos = sprintf(buf, "FAIL\n");
 644
 645 release_lock:
 646         mutex_unlock(&chip->lock);
 647
 648         return pos;
 649 }
 650
 651 static void lp5523_led_brightness_work(struct work_struct *work)
 652 {
 653         struct lp55xx_led *led = container_of(work, struct lp55xx_led,
 654                                               brightness_work);
 655         struct lp55xx_chip *chip = led->chip;
 656
 657         mutex_lock(&chip->lock);
 658         lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + led->chan_nr,
 659                      led->brightness);
 660         mutex_unlock(&chip->lock);
 661 }
 662
 663 static LP55XX_DEV_ATTR_RW(engine1_mode, show_engine1_mode, store_engine1_mode);
 664 static LP55XX_DEV_ATTR_RW(engine2_mode, show_engine2_mode, store_engine2_mode);
 665 static LP55XX_DEV_ATTR_RW(engine3_mode, show_engine3_mode, store_engine3_mode);
 666 static LP55XX_DEV_ATTR_RW(engine1_leds, show_engine1_leds, store_engine1_leds);
 667 static LP55XX_DEV_ATTR_RW(engine2_leds, show_engine2_leds, store_engine2_leds);
 668 static LP55XX_DEV_ATTR_RW(engine3_leds, show_engine3_leds, store_engine3_leds);
 669 static LP55XX_DEV_ATTR_WO(engine1_load, store_engine1_load);
 670 static LP55XX_DEV_ATTR_WO(engine2_load, store_engine2_load);
 671 static LP55XX_DEV_ATTR_WO(engine3_load, store_engine3_load);
 672 static LP55XX_DEV_ATTR_RO(selftest, lp5523_selftest);
 673
 674 static struct attribute *lp5523_attributes[] = {
 675         &dev_attr_engine1_mode.attr,
 676         &dev_attr_engine2_mode.attr,
 677         &dev_attr_engine3_mode.attr,
 678         &dev_attr_engine1_load.attr,
 679         &dev_attr_engine2_load.attr,
 680         &dev_attr_engine3_load.attr,
 681         &dev_attr_engine1_leds.attr,
 682         &dev_attr_engine2_leds.attr,
 683         &dev_attr_engine3_leds.attr,
 684         &dev_attr_selftest.attr,
 685         NULL,
 686 };
 687
 688 static const struct attribute_group lp5523_group = {
 689         .attrs = lp5523_attributes,
 690 };
 691
 692 /* Chip specific configurations */
 693 static struct lp55xx_device_config lp5523_cfg = {
 694         .reset = {
 695                 .addr = LP5523_REG_RESET,
 696                 .val  = LP5523_RESET,
 697         },
 698         .enable = {
 699                 .addr = LP5523_REG_ENABLE,
 700                 .val  = LP5523_ENABLE,
 701         },
 702         .max_channel  = LP5523_MAX_LEDS,
 703         .post_init_device   = lp5523_post_init_device,
 704         .brightness_work_fn = lp5523_led_brightness_work,
 705         .set_led_current    = lp5523_set_led_current,
 706         .firmware_cb        = lp5523_firmware_loaded,
 707         .run_engine         = lp5523_run_engine,
 708         .dev_attr_group     = &lp5523_group,
 709 };
 710
 711 static int lp5523_probe(struct i2c_client *client,
 712                         const struct i2c_device_id *id)
 713 {
 714         int ret;
 715         struct lp55xx_chip *chip;
 716         struct lp55xx_led *led;
 717         struct lp55xx_platform_data *pdata;
 718         struct device_node *np = client->dev.of_node;
 719
 720         if (!dev_get_platdata(&client->dev)) {
 721                 if (np) {
 722                         ret = lp55xx_of_populate_pdata(&client->dev, np);
 723                         if (ret < 0)
 724                                 return ret;
 725                 } else {
 726                         dev_err(&client->dev, "no platform data\n");
 727                         return -EINVAL;
 728                 }
 729         }
 730         pdata = dev_get_platdata(&client->dev);
 731
 732         chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
 733         if (!chip)
 734                 return -ENOMEM;
 735
 736         led = devm_kzalloc(&client->dev,
 737                         sizeof(*led) * pdata->num_channels, GFP_KERNEL);
 738         if (!led)
 739                 return -ENOMEM;
 740
 741         chip->cl = client;
 742         chip->pdata = pdata;
 743         chip->cfg = &lp5523_cfg;
 744
 745         mutex_init(&chip->lock);
 746
 747         i2c_set_clientdata(client, led);
 748
 749         ret = lp55xx_init_device(chip);
 750         if (ret)
 751                 goto err_init;
 752
 753         dev_info(&client->dev, "%s Programmable led chip found\n", id->name);
 754
 755         ret = lp55xx_register_leds(led, chip);
 756         if (ret)
 757                 goto err_register_leds;
 758
 759         ret = lp55xx_register_sysfs(chip);
 760         if (ret) {
 761                 dev_err(&client->dev, "registering sysfs failed\n");
 762                 goto err_register_sysfs;
 763         }
 764
 765         return 0;
 766
 767 err_register_sysfs:
 768         lp55xx_unregister_leds(led, chip);
 769 err_register_leds:
 770         lp55xx_deinit_device(chip);
 771 err_init:
 772         return ret;
 773 }
 774
 775 static int lp5523_remove(struct i2c_client *client)
 776 {
 777         struct lp55xx_led *led = i2c_get_clientdata(client);
 778         struct lp55xx_chip *chip = led->chip;
 779
 780         lp5523_stop_engine(chip);
 781         lp55xx_unregister_sysfs(chip);
 782         lp55xx_unregister_leds(led, chip);
 783         lp55xx_deinit_device(chip);
 784
 785         return 0;
 786 }
 787
 788 static const struct i2c_device_id lp5523_id[] = {
 789         { "lp5523",  LP5523 },
 790         { "lp55231", LP55231 },
 791         { }
 792 };
 793
 794 MODULE_DEVICE_TABLE(i2c, lp5523_id);
 795
 796 #ifdef CONFIG_OF
 797 static const struct of_device_id of_lp5523_leds_match[] = {
 798         { .compatible = "national,lp5523", },
 799         {},
 800 };
 801
 802 MODULE_DEVICE_TABLE(of, of_lp5523_leds_match);
 803 #endif
 804
 805 static struct i2c_driver lp5523_driver = {
 806         .driver = {
 807                 .name   = "lp5523x",
 808                 .of_match_table = of_match_ptr(of_lp5523_leds_match),
 809         },
 810         .probe          = lp5523_probe,
 811         .remove         = lp5523_remove,
 812         .id_table       = lp5523_id,
 813 };
 814
 815 module_i2c_driver(lp5523_driver);
 816
 817 MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>");
 818 MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
 819 MODULE_DESCRIPTION("LP5523 LED engine");
 820 MODULE_LICENSE("GPL");