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 update_size;
 316         int nrchars;
 317         int offset = 0;
 318         int ret;
 319         int i;
 320
 321         /* clear program memory before updating */
 322         for (i = 0; i < LP5523_PROGRAM_LENGTH; i++)
 323                 lp55xx_write(chip, LP5523_REG_PROG_MEM + i, 0);
 324
 325         i = 0;
 326         while ((offset < size - 1) && (i < LP5523_PROGRAM_LENGTH)) {
 327                 /* separate sscanfs because length is working only for %s */
 328                 ret = sscanf(data + offset, "%2s%n ", c, &nrchars);
 329                 if (ret != 1)
 330                         goto err;
 331
 332                 ret = sscanf(c, "%2x", &cmd);
 333                 if (ret != 1)
 334                         goto err;
 335
 336                 pattern[i] = (u8)cmd;
 337                 offset += nrchars;
 338                 i++;
 339         }
 340
 341         /* Each instruction is 16bit long. Check that length is even */
 342         if (i % 2)
 343                 goto err;
 344
 345         update_size = i;
 346
 347         mutex_lock(&chip->lock);
 348
 349         for (i = 0; i < update_size; i++) {
 350                 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + i, pattern[i]);
 351                 if (ret) {
 352                         mutex_unlock(&chip->lock);
 353                         return -EINVAL;
 354                 }
 355         }
 356
 357         mutex_unlock(&chip->lock);
 358
 359         return size;
 360
 361 err:
 362         dev_err(&chip->cl->dev, "wrong pattern format\n");
 363         return -EINVAL;
 364 }
 365
 366 static void lp5523_firmware_loaded(struct lp55xx_chip *chip)
 367 {
 368         const struct firmware *fw = chip->fw;
 369
 370         if (fw->size > LP5523_PROGRAM_LENGTH) {
 371                 dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n",
 372                         fw->size);
 373                 return;
 374         }
 375
 376         /*
 377          * Program momery sequence
 378          *  1) set engine mode to "LOAD"
 379          *  2) write firmware data into program memory
 380          */
 381
 382         lp5523_load_engine_and_select_page(chip);
 383         lp5523_update_program_memory(chip, fw->data, fw->size);
 384 }
 385
 386 static ssize_t show_engine_mode(struct device *dev,
 387                                 struct device_attribute *attr,
 388                                 char *buf, int nr)
 389 {
 390         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 391         struct lp55xx_chip *chip = led->chip;
 392         enum lp55xx_engine_mode mode = chip->engines[nr - 1].mode;
 393
 394         switch (mode) {
 395         case LP55XX_ENGINE_RUN:
 396                 return sprintf(buf, "run\n");
 397         case LP55XX_ENGINE_LOAD:
 398                 return sprintf(buf, "load\n");
 399         case LP55XX_ENGINE_DISABLED:
 400         default:
 401                 return sprintf(buf, "disabled\n");
 402         }
 403 }
 404 show_mode(1)
 405 show_mode(2)
 406 show_mode(3)
 407
 408 static ssize_t store_engine_mode(struct device *dev,
 409                                  struct device_attribute *attr,
 410                                  const char *buf, size_t len, int nr)
 411 {
 412         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 413         struct lp55xx_chip *chip = led->chip;
 414         struct lp55xx_engine *engine = &chip->engines[nr - 1];
 415
 416         mutex_lock(&chip->lock);
 417
 418         chip->engine_idx = nr;
 419
 420         if (!strncmp(buf, "run", 3)) {
 421                 lp5523_run_engine(chip, true);
 422                 engine->mode = LP55XX_ENGINE_RUN;
 423         } else if (!strncmp(buf, "load", 4)) {
 424                 lp5523_stop_engine(chip);
 425                 lp5523_load_engine(chip);
 426                 engine->mode = LP55XX_ENGINE_LOAD;
 427         } else if (!strncmp(buf, "disabled", 8)) {
 428                 lp5523_stop_engine(chip);
 429                 engine->mode = LP55XX_ENGINE_DISABLED;
 430         }
 431
 432         mutex_unlock(&chip->lock);
 433
 434         return len;
 435 }
 436 store_mode(1)
 437 store_mode(2)
 438 store_mode(3)
 439
 440 static int lp5523_mux_parse(const char *buf, u16 *mux, size_t len)
 441 {
 442         u16 tmp_mux = 0;
 443         int i;
 444
 445         len = min_t(int, len, LP5523_MAX_LEDS);
 446
 447         for (i = 0; i < len; i++) {
 448                 switch (buf[i]) {
 449                 case '1':
 450                         tmp_mux |= (1 << i);
 451                         break;
 452                 case '0':
 453                         break;
 454                 case '\n':
 455                         i = len;
 456                         break;
 457                 default:
 458                         return -1;
 459                 }
 460         }
 461         *mux = tmp_mux;
 462
 463         return 0;
 464 }
 465
 466 static void lp5523_mux_to_array(u16 led_mux, char *array)
 467 {
 468         int i, pos = 0;
 469         for (i = 0; i < LP5523_MAX_LEDS; i++)
 470                 pos += sprintf(array + pos, "%x", LED_ACTIVE(led_mux, i));
 471
 472         array[pos] = '\0';
 473 }
 474
 475 static ssize_t show_engine_leds(struct device *dev,
 476                             struct device_attribute *attr,
 477                             char *buf, int nr)
 478 {
 479         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 480         struct lp55xx_chip *chip = led->chip;
 481         char mux[LP5523_MAX_LEDS + 1];
 482
 483         lp5523_mux_to_array(chip->engines[nr - 1].led_mux, mux);
 484
 485         return sprintf(buf, "%s\n", mux);
 486 }
 487 show_leds(1)
 488 show_leds(2)
 489 show_leds(3)
 490
 491 static int lp5523_load_mux(struct lp55xx_chip *chip, u16 mux, int nr)
 492 {
 493         struct lp55xx_engine *engine = &chip->engines[nr - 1];
 494         int ret;
 495         u8 mux_page[] = {
 496                 [LP55XX_ENGINE_1] = LP5523_PAGE_MUX1,
 497                 [LP55XX_ENGINE_2] = LP5523_PAGE_MUX2,
 498                 [LP55XX_ENGINE_3] = LP5523_PAGE_MUX3,
 499         };
 500
 501         lp5523_load_engine(chip);
 502
 503         ret = lp55xx_write(chip, LP5523_REG_PROG_PAGE_SEL, mux_page[nr]);
 504         if (ret)
 505                 return ret;
 506
 507         ret = lp55xx_write(chip, LP5523_REG_PROG_MEM , (u8)(mux >> 8));
 508         if (ret)
 509                 return ret;
 510
 511         ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + 1, (u8)(mux));
 512         if (ret)
 513                 return ret;
 514
 515         engine->led_mux = mux;
 516         return 0;
 517 }
 518
 519 static ssize_t store_engine_leds(struct device *dev,
 520                              struct device_attribute *attr,
 521                              const char *buf, size_t len, int nr)
 522 {
 523         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 524         struct lp55xx_chip *chip = led->chip;
 525         struct lp55xx_engine *engine = &chip->engines[nr - 1];
 526         u16 mux = 0;
 527         ssize_t ret;
 528
 529         if (lp5523_mux_parse(buf, &mux, len))
 530                 return -EINVAL;
 531
 532         mutex_lock(&chip->lock);
 533
 534         chip->engine_idx = nr;
 535         ret = -EINVAL;
 536
 537         if (engine->mode != LP55XX_ENGINE_LOAD)
 538                 goto leave;
 539
 540         if (lp5523_load_mux(chip, mux, nr))
 541                 goto leave;
 542
 543         ret = len;
 544 leave:
 545         mutex_unlock(&chip->lock);
 546         return ret;
 547 }
 548 store_leds(1)
 549 store_leds(2)
 550 store_leds(3)
 551
 552 static ssize_t store_engine_load(struct device *dev,
 553                              struct device_attribute *attr,
 554                              const char *buf, size_t len, int nr)
 555 {
 556         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 557         struct lp55xx_chip *chip = led->chip;
 558
 559         mutex_lock(&chip->lock);
 560
 561         chip->engine_idx = nr;
 562         lp5523_load_engine_and_select_page(chip);
 563
 564         mutex_unlock(&chip->lock);
 565
 566         return lp5523_update_program_memory(chip, buf, len);
 567 }
 568 store_load(1)
 569 store_load(2)
 570 store_load(3)
 571
 572 static ssize_t lp5523_selftest(struct device *dev,
 573                                struct device_attribute *attr,
 574                                char *buf)
 575 {
 576         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 577         struct lp55xx_chip *chip = led->chip;
 578         struct lp55xx_platform_data *pdata = chip->pdata;
 579         int i, ret, pos = 0;
 580         u8 status, adc, vdd;
 581
 582         mutex_lock(&chip->lock);
 583
 584         ret = lp55xx_read(chip, LP5523_REG_STATUS, &status);
 585         if (ret < 0)
 586                 goto fail;
 587
 588         /* Check that ext clock is really in use if requested */
 589         if (pdata->clock_mode == LP55XX_CLOCK_EXT) {
 590                 if  ((status & LP5523_EXT_CLK_USED) == 0)
 591                         goto fail;
 592         }
 593
 594         /* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */
 595         lp55xx_write(chip, LP5523_REG_LED_TEST_CTRL, LP5523_EN_LEDTEST | 16);
 596         usleep_range(3000, 6000); /* ADC conversion time is typically 2.7 ms */
 597         ret = lp55xx_read(chip, LP5523_REG_STATUS, &status);
 598         if (ret < 0)
 599                 goto fail;
 600
 601         if (!(status & LP5523_LEDTEST_DONE))
 602                 usleep_range(3000, 6000); /* Was not ready. Wait little bit */
 603
 604         ret = lp55xx_read(chip, LP5523_REG_LED_TEST_ADC, &vdd);
 605         if (ret < 0)
 606                 goto fail;
 607
 608         vdd--;  /* There may be some fluctuation in measurement */
 609
 610         for (i = 0; i < LP5523_MAX_LEDS; i++) {
 611                 /* Skip non-existing channels */
 612                 if (pdata->led_config[i].led_current == 0)
 613                         continue;
 614
 615                 /* Set default current */
 616                 lp55xx_write(chip, LP5523_REG_LED_CURRENT_BASE + i,
 617                         pdata->led_config[i].led_current);
 618
 619                 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0xff);
 620                 /* let current stabilize 2 - 4ms before measurements start */
 621                 usleep_range(2000, 4000);
 622                 lp55xx_write(chip, LP5523_REG_LED_TEST_CTRL,
 623                              LP5523_EN_LEDTEST | i);
 624                 /* ADC conversion time is 2.7 ms typically */
 625                 usleep_range(3000, 6000);
 626                 ret = lp55xx_read(chip, LP5523_REG_STATUS, &status);
 627                 if (ret < 0)
 628                         goto fail;
 629
 630                 if (!(status & LP5523_LEDTEST_DONE))
 631                         usleep_range(3000, 6000);/* Was not ready. Wait. */
 632
 633                 ret = lp55xx_read(chip, LP5523_REG_LED_TEST_ADC, &adc);
 634                 if (ret < 0)
 635                         goto fail;
 636
 637                 if (adc >= vdd || adc < LP5523_ADC_SHORTCIRC_LIM)
 638                         pos += sprintf(buf + pos, "LED %d FAIL\n", i);
 639
 640                 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0x00);
 641
 642                 /* Restore current */
 643                 lp55xx_write(chip, LP5523_REG_LED_CURRENT_BASE + i,
 644                         led->led_current);
 645                 led++;
 646         }
 647         if (pos == 0)
 648                 pos = sprintf(buf, "OK\n");
 649         goto release_lock;
 650 fail:
 651         pos = sprintf(buf, "FAIL\n");
 652
 653 release_lock:
 654         mutex_unlock(&chip->lock);
 655
 656         return pos;
 657 }
 658
 659 static void lp5523_led_brightness_work(struct work_struct *work)
 660 {
 661         struct lp55xx_led *led = container_of(work, struct lp55xx_led,
 662                                               brightness_work);
 663         struct lp55xx_chip *chip = led->chip;
 664
 665         mutex_lock(&chip->lock);
 666         lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + led->chan_nr,
 667                      led->brightness);
 668         mutex_unlock(&chip->lock);
 669 }
 670
 671 static LP55XX_DEV_ATTR_RW(engine1_mode, show_engine1_mode, store_engine1_mode);
 672 static LP55XX_DEV_ATTR_RW(engine2_mode, show_engine2_mode, store_engine2_mode);
 673 static LP55XX_DEV_ATTR_RW(engine3_mode, show_engine3_mode, store_engine3_mode);
 674 static LP55XX_DEV_ATTR_RW(engine1_leds, show_engine1_leds, store_engine1_leds);
 675 static LP55XX_DEV_ATTR_RW(engine2_leds, show_engine2_leds, store_engine2_leds);
 676 static LP55XX_DEV_ATTR_RW(engine3_leds, show_engine3_leds, store_engine3_leds);
 677 static LP55XX_DEV_ATTR_WO(engine1_load, store_engine1_load);
 678 static LP55XX_DEV_ATTR_WO(engine2_load, store_engine2_load);
 679 static LP55XX_DEV_ATTR_WO(engine3_load, store_engine3_load);
 680 static LP55XX_DEV_ATTR_RO(selftest, lp5523_selftest);
 681
 682 static struct attribute *lp5523_attributes[] = {
 683         &dev_attr_engine1_mode.attr,
 684         &dev_attr_engine2_mode.attr,
 685         &dev_attr_engine3_mode.attr,
 686         &dev_attr_engine1_load.attr,
 687         &dev_attr_engine2_load.attr,
 688         &dev_attr_engine3_load.attr,
 689         &dev_attr_engine1_leds.attr,
 690         &dev_attr_engine2_leds.attr,
 691         &dev_attr_engine3_leds.attr,
 692         &dev_attr_selftest.attr,
 693         NULL,
 694 };
 695
 696 static const struct attribute_group lp5523_group = {
 697         .attrs = lp5523_attributes,
 698 };
 699
 700 /* Chip specific configurations */
 701 static struct lp55xx_device_config lp5523_cfg = {
 702         .reset = {
 703                 .addr = LP5523_REG_RESET,
 704                 .val  = LP5523_RESET,
 705         },
 706         .enable = {
 707                 .addr = LP5523_REG_ENABLE,
 708                 .val  = LP5523_ENABLE,
 709         },
 710         .max_channel  = LP5523_MAX_LEDS,
 711         .post_init_device   = lp5523_post_init_device,
 712         .brightness_work_fn = lp5523_led_brightness_work,
 713         .set_led_current    = lp5523_set_led_current,
 714         .firmware_cb        = lp5523_firmware_loaded,
 715         .run_engine         = lp5523_run_engine,
 716         .dev_attr_group     = &lp5523_group,
 717 };
 718
 719 static int lp5523_probe(struct i2c_client *client,
 720                         const struct i2c_device_id *id)
 721 {
 722         int ret;
 723         struct lp55xx_chip *chip;
 724         struct lp55xx_led *led;
 725         struct lp55xx_platform_data *pdata;
 726         struct device_node *np = client->dev.of_node;
 727
 728         if (!dev_get_platdata(&client->dev)) {
 729                 if (np) {
 730                         ret = lp55xx_of_populate_pdata(&client->dev, np);
 731                         if (ret < 0)
 732                                 return ret;
 733                 } else {
 734                         dev_err(&client->dev, "no platform data\n");
 735                         return -EINVAL;
 736                 }
 737         }
 738         pdata = dev_get_platdata(&client->dev);
 739
 740         chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
 741         if (!chip)
 742                 return -ENOMEM;
 743
 744         led = devm_kzalloc(&client->dev,
 745                         sizeof(*led) * pdata->num_channels, GFP_KERNEL);
 746         if (!led)
 747                 return -ENOMEM;
 748
 749         chip->cl = client;
 750         chip->pdata = pdata;
 751         chip->cfg = &lp5523_cfg;
 752
 753         mutex_init(&chip->lock);
 754
 755         i2c_set_clientdata(client, led);
 756
 757         ret = lp55xx_init_device(chip);
 758         if (ret)
 759                 goto err_init;
 760
 761         dev_info(&client->dev, "%s Programmable led chip found\n", id->name);
 762
 763         ret = lp55xx_register_leds(led, chip);
 764         if (ret)
 765                 goto err_register_leds;
 766
 767         ret = lp55xx_register_sysfs(chip);
 768         if (ret) {
 769                 dev_err(&client->dev, "registering sysfs failed\n");
 770                 goto err_register_sysfs;
 771         }
 772
 773         return 0;
 774
 775 err_register_sysfs:
 776         lp55xx_unregister_leds(led, chip);
 777 err_register_leds:
 778         lp55xx_deinit_device(chip);
 779 err_init:
 780         return ret;
 781 }
 782
 783 static int lp5523_remove(struct i2c_client *client)
 784 {
 785         struct lp55xx_led *led = i2c_get_clientdata(client);
 786         struct lp55xx_chip *chip = led->chip;
 787
 788         lp5523_stop_engine(chip);
 789         lp55xx_unregister_sysfs(chip);
 790         lp55xx_unregister_leds(led, chip);
 791         lp55xx_deinit_device(chip);
 792
 793         return 0;
 794 }
 795
 796 static const struct i2c_device_id lp5523_id[] = {
 797         { "lp5523",  LP5523 },
 798         { "lp55231", LP55231 },
 799         { }
 800 };
 801
 802 MODULE_DEVICE_TABLE(i2c, lp5523_id);
 803
 804 #ifdef CONFIG_OF
 805 static const struct of_device_id of_lp5523_leds_match[] = {
 806         { .compatible = "national,lp5523", },
 807         {},
 808 };
 809
 810 MODULE_DEVICE_TABLE(of, of_lp5523_leds_match);
 811 #endif
 812
 813 static struct i2c_driver lp5523_driver = {
 814         .driver = {
 815                 .name   = "lp5523x",
 816                 .of_match_table = of_match_ptr(of_lp5523_leds_match),
 817         },
 818         .probe          = lp5523_probe,
 819         .remove         = lp5523_remove,
 820         .id_table       = lp5523_id,
 821 };
 822
 823 module_i2c_driver(lp5523_driver);
 824
 825 MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>");
 826 MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
 827 MODULE_DESCRIPTION("LP5523 LED engine");
 828 MODULE_LICENSE("GPL");