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