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