kernel/drivers/leds/leds-lp5523.c

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