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_CTRL_BASE        0x06
  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_MASTER_FADER_BASE    0x48
  62 #define LP5523_REG_CH1_PROG_START       0x4C
  63 #define LP5523_REG_CH2_PROG_START       0x4D
  64 #define LP5523_REG_CH3_PROG_START       0x4E
  65 #define LP5523_REG_PROG_PAGE_SEL        0x4F
  66 #define LP5523_REG_PROG_MEM             0x50
  67
  68 /* Bit description in registers */
  69 #define LP5523_ENABLE                   0x40
  70 #define LP5523_AUTO_INC                 0x40
  71 #define LP5523_PWR_SAVE                 0x20
  72 #define LP5523_PWM_PWR_SAVE             0x04
  73 #define LP5523_CP_AUTO                  0x18
  74 #define LP5523_AUTO_CLK                 0x02
  75
  76 #define LP5523_EN_LEDTEST               0x80
  77 #define LP5523_LEDTEST_DONE             0x80
  78 #define LP5523_RESET                    0xFF
  79 #define LP5523_ADC_SHORTCIRC_LIM        80
  80 #define LP5523_EXT_CLK_USED             0x08
  81 #define LP5523_ENG_STATUS_MASK          0x07
  82
  83 #define LP5523_FADER_MAPPING_MASK       0xC0
  84 #define LP5523_FADER_MAPPING_SHIFT      6
  85
  86 /* Memory Page Selection */
  87 #define LP5523_PAGE_ENG1                0
  88 #define LP5523_PAGE_ENG2                1
  89 #define LP5523_PAGE_ENG3                2
  90 #define LP5523_PAGE_MUX1                3
  91 #define LP5523_PAGE_MUX2                4
  92 #define LP5523_PAGE_MUX3                5
  93
  94 /* Program Memory Operations */
  95 #define LP5523_MODE_ENG1_M              0x30    /* Operation Mode Register */
  96 #define LP5523_MODE_ENG2_M              0x0C
  97 #define LP5523_MODE_ENG3_M              0x03
  98 #define LP5523_LOAD_ENG1                0x10
  99 #define LP5523_LOAD_ENG2                0x04
 100 #define LP5523_LOAD_ENG3                0x01
 101
 102 #define LP5523_ENG1_IS_LOADING(mode)    \
 103         ((mode & LP5523_MODE_ENG1_M) == LP5523_LOAD_ENG1)
 104 #define LP5523_ENG2_IS_LOADING(mode)    \
 105         ((mode & LP5523_MODE_ENG2_M) == LP5523_LOAD_ENG2)
 106 #define LP5523_ENG3_IS_LOADING(mode)    \
 107         ((mode & LP5523_MODE_ENG3_M) == LP5523_LOAD_ENG3)
 108
 109 #define LP5523_EXEC_ENG1_M              0x30    /* Enable Register */
 110 #define LP5523_EXEC_ENG2_M              0x0C
 111 #define LP5523_EXEC_ENG3_M              0x03
 112 #define LP5523_EXEC_M                   0x3F
 113 #define LP5523_RUN_ENG1                 0x20
 114 #define LP5523_RUN_ENG2                 0x08
 115 #define LP5523_RUN_ENG3                 0x02
 116
 117 #define LED_ACTIVE(mux, led)            (!!(mux & (0x0001 << led)))
 118
 119 enum lp5523_chip_id {
 120         LP5523,
 121         LP55231,
 122 };
 123
 124 static int lp5523_init_program_engine(struct lp55xx_chip *chip);
 125
 126 static inline void lp5523_wait_opmode_done(void)
 127 {
 128         usleep_range(1000, 2000);
 129 }
 130
 131 static void lp5523_set_led_current(struct lp55xx_led *led, u8 led_current)
 132 {
 133         led->led_current = led_current;
 134         lp55xx_write(led->chip, LP5523_REG_LED_CURRENT_BASE + led->chan_nr,
 135                 led_current);
 136 }
 137
 138 static int lp5523_post_init_device(struct lp55xx_chip *chip)
 139 {
 140         int ret;
 141
 142         ret = lp55xx_write(chip, LP5523_REG_ENABLE, LP5523_ENABLE);
 143         if (ret)
 144                 return ret;
 145
 146         /* Chip startup time is 500 us, 1 - 2 ms gives some margin */
 147         usleep_range(1000, 2000);
 148
 149         ret = lp55xx_write(chip, LP5523_REG_CONFIG,
 150                             LP5523_AUTO_INC | LP5523_PWR_SAVE |
 151                             LP5523_CP_AUTO | LP5523_AUTO_CLK |
 152                             LP5523_PWM_PWR_SAVE);
 153         if (ret)
 154                 return ret;
 155
 156         /* turn on all leds */
 157         ret = lp55xx_write(chip, LP5523_REG_ENABLE_LEDS_MSB, 0x01);
 158         if (ret)
 159                 return ret;
 160
 161         ret = lp55xx_write(chip, LP5523_REG_ENABLE_LEDS_LSB, 0xff);
 162         if (ret)
 163                 return ret;
 164
 165         return lp5523_init_program_engine(chip);
 166 }
 167
 168 static void lp5523_load_engine(struct lp55xx_chip *chip)
 169 {
 170         enum lp55xx_engine_index idx = chip->engine_idx;
 171         u8 mask[] = {
 172                 [LP55XX_ENGINE_1] = LP5523_MODE_ENG1_M,
 173                 [LP55XX_ENGINE_2] = LP5523_MODE_ENG2_M,
 174                 [LP55XX_ENGINE_3] = LP5523_MODE_ENG3_M,
 175         };
 176
 177         u8 val[] = {
 178                 [LP55XX_ENGINE_1] = LP5523_LOAD_ENG1,
 179                 [LP55XX_ENGINE_2] = LP5523_LOAD_ENG2,
 180                 [LP55XX_ENGINE_3] = LP5523_LOAD_ENG3,
 181         };
 182
 183         lp55xx_update_bits(chip, LP5523_REG_OP_MODE, mask[idx], val[idx]);
 184
 185         lp5523_wait_opmode_done();
 186 }
 187
 188 static void lp5523_load_engine_and_select_page(struct lp55xx_chip *chip)
 189 {
 190         enum lp55xx_engine_index idx = chip->engine_idx;
 191         u8 page_sel[] = {
 192                 [LP55XX_ENGINE_1] = LP5523_PAGE_ENG1,
 193                 [LP55XX_ENGINE_2] = LP5523_PAGE_ENG2,
 194                 [LP55XX_ENGINE_3] = LP5523_PAGE_ENG3,
 195         };
 196
 197         lp5523_load_engine(chip);
 198
 199         lp55xx_write(chip, LP5523_REG_PROG_PAGE_SEL, page_sel[idx]);
 200 }
 201
 202 static void lp5523_stop_all_engines(struct lp55xx_chip *chip)
 203 {
 204         lp55xx_write(chip, LP5523_REG_OP_MODE, 0);
 205         lp5523_wait_opmode_done();
 206 }
 207
 208 static void lp5523_stop_engine(struct lp55xx_chip *chip)
 209 {
 210         enum lp55xx_engine_index idx = chip->engine_idx;
 211         u8 mask[] = {
 212                 [LP55XX_ENGINE_1] = LP5523_MODE_ENG1_M,
 213                 [LP55XX_ENGINE_2] = LP5523_MODE_ENG2_M,
 214                 [LP55XX_ENGINE_3] = LP5523_MODE_ENG3_M,
 215         };
 216
 217         lp55xx_update_bits(chip, LP5523_REG_OP_MODE, mask[idx], 0);
 218
 219         lp5523_wait_opmode_done();
 220 }
 221
 222 static void lp5523_turn_off_channels(struct lp55xx_chip *chip)
 223 {
 224         int i;
 225
 226         for (i = 0; i < LP5523_MAX_LEDS; i++)
 227                 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0);
 228 }
 229
 230 static void lp5523_run_engine(struct lp55xx_chip *chip, bool start)
 231 {
 232         int ret;
 233         u8 mode;
 234         u8 exec;
 235
 236         /* stop engine */
 237         if (!start) {
 238                 lp5523_stop_engine(chip);
 239                 lp5523_turn_off_channels(chip);
 240                 return;
 241         }
 242
 243         /*
 244          * To run the engine,
 245          * operation mode and enable register should updated at the same time
 246          */
 247
 248         ret = lp55xx_read(chip, LP5523_REG_OP_MODE, &mode);
 249         if (ret)
 250                 return;
 251
 252         ret = lp55xx_read(chip, LP5523_REG_ENABLE, &exec);
 253         if (ret)
 254                 return;
 255
 256         /* change operation mode to RUN only when each engine is loading */
 257         if (LP5523_ENG1_IS_LOADING(mode)) {
 258                 mode = (mode & ~LP5523_MODE_ENG1_M) | LP5523_RUN_ENG1;
 259                 exec = (exec & ~LP5523_EXEC_ENG1_M) | LP5523_RUN_ENG1;
 260         }
 261
 262         if (LP5523_ENG2_IS_LOADING(mode)) {
 263                 mode = (mode & ~LP5523_MODE_ENG2_M) | LP5523_RUN_ENG2;
 264                 exec = (exec & ~LP5523_EXEC_ENG2_M) | LP5523_RUN_ENG2;
 265         }
 266
 267         if (LP5523_ENG3_IS_LOADING(mode)) {
 268                 mode = (mode & ~LP5523_MODE_ENG3_M) | LP5523_RUN_ENG3;
 269                 exec = (exec & ~LP5523_EXEC_ENG3_M) | LP5523_RUN_ENG3;
 270         }
 271
 272         lp55xx_write(chip, LP5523_REG_OP_MODE, mode);
 273         lp5523_wait_opmode_done();
 274
 275         lp55xx_update_bits(chip, LP5523_REG_ENABLE, LP5523_EXEC_M, exec);
 276 }
 277
 278 static int lp5523_init_program_engine(struct lp55xx_chip *chip)
 279 {
 280         int i;
 281         int j;
 282         int ret;
 283         u8 status;
 284         /* one pattern per engine setting LED MUX start and stop addresses */
 285         static const u8 pattern[][LP5523_PROGRAM_LENGTH] =  {
 286                 { 0x9c, 0x30, 0x9c, 0xb0, 0x9d, 0x80, 0xd8, 0x00, 0},
 287                 { 0x9c, 0x40, 0x9c, 0xc0, 0x9d, 0x80, 0xd8, 0x00, 0},
 288                 { 0x9c, 0x50, 0x9c, 0xd0, 0x9d, 0x80, 0xd8, 0x00, 0},
 289         };
 290
 291         /* hardcode 32 bytes of memory for each engine from program memory */
 292         ret = lp55xx_write(chip, LP5523_REG_CH1_PROG_START, 0x00);
 293         if (ret)
 294                 return ret;
 295
 296         ret = lp55xx_write(chip, LP5523_REG_CH2_PROG_START, 0x10);
 297         if (ret)
 298                 return ret;
 299
 300         ret = lp55xx_write(chip, LP5523_REG_CH3_PROG_START, 0x20);
 301         if (ret)
 302                 return ret;
 303
 304         /* write LED MUX address space for each engine */
 305         for (i = LP55XX_ENGINE_1; i <= LP55XX_ENGINE_3; i++) {
 306                 chip->engine_idx = i;
 307                 lp5523_load_engine_and_select_page(chip);
 308
 309                 for (j = 0; j < LP5523_PROGRAM_LENGTH; j++) {
 310                         ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + j,
 311                                         pattern[i - 1][j]);
 312                         if (ret)
 313                                 goto out;
 314                 }
 315         }
 316
 317         lp5523_run_engine(chip, true);
 318
 319         /* Let the programs run for couple of ms and check the engine status */
 320         usleep_range(3000, 6000);
 321         lp55xx_read(chip, LP5523_REG_STATUS, &status);
 322         status &= LP5523_ENG_STATUS_MASK;
 323
 324         if (status != LP5523_ENG_STATUS_MASK) {
 325                 dev_err(&chip->cl->dev,
 326                         "cound not configure LED engine, status = 0x%.2x\n",
 327                         status);
 328                 ret = -1;
 329         }
 330
 331 out:
 332         lp5523_stop_all_engines(chip);
 333         return ret;
 334 }
 335
 336 static int lp5523_update_program_memory(struct lp55xx_chip *chip,
 337                                         const u8 *data, size_t size)
 338 {
 339         u8 pattern[LP5523_PROGRAM_LENGTH] = {0};
 340         unsigned cmd;
 341         char c[3];
 342         int nrchars;
 343         int ret;
 344         int offset = 0;
 345         int i = 0;
 346
 347         while ((offset < size - 1) && (i < LP5523_PROGRAM_LENGTH)) {
 348                 /* separate sscanfs because length is working only for %s */
 349                 ret = sscanf(data + offset, "%2s%n ", c, &nrchars);
 350                 if (ret != 1)
 351                         goto err;
 352
 353                 ret = sscanf(c, "%2x", &cmd);
 354                 if (ret != 1)
 355                         goto err;
 356
 357                 pattern[i] = (u8)cmd;
 358                 offset += nrchars;
 359                 i++;
 360         }
 361
 362         /* Each instruction is 16bit long. Check that length is even */
 363         if (i % 2)
 364                 goto err;
 365
 366         for (i = 0; i < LP5523_PROGRAM_LENGTH; i++) {
 367                 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + i, pattern[i]);
 368                 if (ret)
 369                         return -EINVAL;
 370         }
 371
 372         return size;
 373
 374 err:
 375         dev_err(&chip->cl->dev, "wrong pattern format\n");
 376         return -EINVAL;
 377 }
 378
 379 static void lp5523_firmware_loaded(struct lp55xx_chip *chip)
 380 {
 381         const struct firmware *fw = chip->fw;
 382
 383         if (fw->size > LP5523_PROGRAM_LENGTH) {
 384                 dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n",
 385                         fw->size);
 386                 return;
 387         }
 388
 389         /*
 390          * Program momery sequence
 391          *  1) set engine mode to "LOAD"
 392          *  2) write firmware data into program memory
 393          */
 394
 395         lp5523_load_engine_and_select_page(chip);
 396         lp5523_update_program_memory(chip, fw->data, fw->size);
 397 }
 398
 399 static ssize_t show_engine_mode(struct device *dev,
 400                                 struct device_attribute *attr,
 401                                 char *buf, int nr)
 402 {
 403         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 404         struct lp55xx_chip *chip = led->chip;
 405         enum lp55xx_engine_mode mode = chip->engines[nr - 1].mode;
 406
 407         switch (mode) {
 408         case LP55XX_ENGINE_RUN:
 409                 return sprintf(buf, "run\n");
 410         case LP55XX_ENGINE_LOAD:
 411                 return sprintf(buf, "load\n");
 412         case LP55XX_ENGINE_DISABLED:
 413         default:
 414                 return sprintf(buf, "disabled\n");
 415         }
 416 }
 417 show_mode(1)
 418 show_mode(2)
 419 show_mode(3)
 420
 421 static ssize_t store_engine_mode(struct device *dev,
 422                                  struct device_attribute *attr,
 423                                  const char *buf, size_t len, int nr)
 424 {
 425         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 426         struct lp55xx_chip *chip = led->chip;
 427         struct lp55xx_engine *engine = &chip->engines[nr - 1];
 428
 429         mutex_lock(&chip->lock);
 430
 431         chip->engine_idx = nr;
 432
 433         if (!strncmp(buf, "run", 3)) {
 434                 lp5523_run_engine(chip, true);
 435                 engine->mode = LP55XX_ENGINE_RUN;
 436         } else if (!strncmp(buf, "load", 4)) {
 437                 lp5523_stop_engine(chip);
 438                 lp5523_load_engine(chip);
 439                 engine->mode = LP55XX_ENGINE_LOAD;
 440         } else if (!strncmp(buf, "disabled", 8)) {
 441                 lp5523_stop_engine(chip);
 442                 engine->mode = LP55XX_ENGINE_DISABLED;
 443         }
 444
 445         mutex_unlock(&chip->lock);
 446
 447         return len;
 448 }
 449 store_mode(1)
 450 store_mode(2)
 451 store_mode(3)
 452
 453 static int lp5523_mux_parse(const char *buf, u16 *mux, size_t len)
 454 {
 455         u16 tmp_mux = 0;
 456         int i;
 457
 458         len = min_t(int, len, LP5523_MAX_LEDS);
 459
 460         for (i = 0; i < len; i++) {
 461                 switch (buf[i]) {
 462                 case '1':
 463                         tmp_mux |= (1 << i);
 464                         break;
 465                 case '0':
 466                         break;
 467                 case '\n':
 468                         i = len;
 469                         break;
 470                 default:
 471                         return -1;
 472                 }
 473         }
 474         *mux = tmp_mux;
 475
 476         return 0;
 477 }
 478
 479 static void lp5523_mux_to_array(u16 led_mux, char *array)
 480 {
 481         int i, pos = 0;
 482         for (i = 0; i < LP5523_MAX_LEDS; i++)
 483                 pos += sprintf(array + pos, "%x", LED_ACTIVE(led_mux, i));
 484
 485         array[pos] = '\0';
 486 }
 487
 488 static ssize_t show_engine_leds(struct device *dev,
 489                             struct device_attribute *attr,
 490                             char *buf, int nr)
 491 {
 492         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 493         struct lp55xx_chip *chip = led->chip;
 494         char mux[LP5523_MAX_LEDS + 1];
 495
 496         lp5523_mux_to_array(chip->engines[nr - 1].led_mux, mux);
 497
 498         return sprintf(buf, "%s\n", mux);
 499 }
 500 show_leds(1)
 501 show_leds(2)
 502 show_leds(3)
 503
 504 static int lp5523_load_mux(struct lp55xx_chip *chip, u16 mux, int nr)
 505 {
 506         struct lp55xx_engine *engine = &chip->engines[nr - 1];
 507         int ret;
 508         u8 mux_page[] = {
 509                 [LP55XX_ENGINE_1] = LP5523_PAGE_MUX1,
 510                 [LP55XX_ENGINE_2] = LP5523_PAGE_MUX2,
 511                 [LP55XX_ENGINE_3] = LP5523_PAGE_MUX3,
 512         };
 513
 514         lp5523_load_engine(chip);
 515
 516         ret = lp55xx_write(chip, LP5523_REG_PROG_PAGE_SEL, mux_page[nr]);
 517         if (ret)
 518                 return ret;
 519
 520         ret = lp55xx_write(chip, LP5523_REG_PROG_MEM , (u8)(mux >> 8));
 521         if (ret)
 522                 return ret;
 523
 524         ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + 1, (u8)(mux));
 525         if (ret)
 526                 return ret;
 527
 528         engine->led_mux = mux;
 529         return 0;
 530 }
 531
 532 static ssize_t store_engine_leds(struct device *dev,
 533                              struct device_attribute *attr,
 534                              const char *buf, size_t len, int nr)
 535 {
 536         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 537         struct lp55xx_chip *chip = led->chip;
 538         struct lp55xx_engine *engine = &chip->engines[nr - 1];
 539         u16 mux = 0;
 540         ssize_t ret;
 541
 542         if (lp5523_mux_parse(buf, &mux, len))
 543                 return -EINVAL;
 544
 545         mutex_lock(&chip->lock);
 546
 547         chip->engine_idx = nr;
 548         ret = -EINVAL;
 549
 550         if (engine->mode != LP55XX_ENGINE_LOAD)
 551                 goto leave;
 552
 553         if (lp5523_load_mux(chip, mux, nr))
 554                 goto leave;
 555
 556         ret = len;
 557 leave:
 558         mutex_unlock(&chip->lock);
 559         return ret;
 560 }
 561 store_leds(1)
 562 store_leds(2)
 563 store_leds(3)
 564
 565 static ssize_t store_engine_load(struct device *dev,
 566                              struct device_attribute *attr,
 567                              const char *buf, size_t len, int nr)
 568 {
 569         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 570         struct lp55xx_chip *chip = led->chip;
 571         int ret;
 572
 573         mutex_lock(&chip->lock);
 574
 575         chip->engine_idx = nr;
 576         lp5523_load_engine_and_select_page(chip);
 577         ret = lp5523_update_program_memory(chip, buf, len);
 578
 579         mutex_unlock(&chip->lock);
 580
 581         return ret;
 582 }
 583 store_load(1)
 584 store_load(2)
 585 store_load(3)
 586
 587 static ssize_t lp5523_selftest(struct device *dev,
 588                                struct device_attribute *attr,
 589                                char *buf)
 590 {
 591         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 592         struct lp55xx_chip *chip = led->chip;
 593         struct lp55xx_platform_data *pdata = chip->pdata;
 594         int i, ret, pos = 0;
 595         u8 status, adc, vdd;
 596
 597         mutex_lock(&chip->lock);
 598
 599         ret = lp55xx_read(chip, LP5523_REG_STATUS, &status);
 600         if (ret < 0)
 601                 goto fail;
 602
 603         /* Check that ext clock is really in use if requested */
 604         if (pdata->clock_mode == LP55XX_CLOCK_EXT) {
 605                 if  ((status & LP5523_EXT_CLK_USED) == 0)
 606                         goto fail;
 607         }
 608
 609         /* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */
 610         lp55xx_write(chip, LP5523_REG_LED_TEST_CTRL, LP5523_EN_LEDTEST | 16);
 611         usleep_range(3000, 6000); /* ADC conversion time is typically 2.7 ms */
 612         ret = lp55xx_read(chip, LP5523_REG_STATUS, &status);
 613         if (ret < 0)
 614                 goto fail;
 615
 616         if (!(status & LP5523_LEDTEST_DONE))
 617                 usleep_range(3000, 6000); /* Was not ready. Wait little bit */
 618
 619         ret = lp55xx_read(chip, LP5523_REG_LED_TEST_ADC, &vdd);
 620         if (ret < 0)
 621                 goto fail;
 622
 623         vdd--;  /* There may be some fluctuation in measurement */
 624
 625         for (i = 0; i < LP5523_MAX_LEDS; i++) {
 626                 /* Skip non-existing channels */
 627                 if (pdata->led_config[i].led_current == 0)
 628                         continue;
 629
 630                 /* Set default current */
 631                 lp55xx_write(chip, LP5523_REG_LED_CURRENT_BASE + i,
 632                         pdata->led_config[i].led_current);
 633
 634                 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0xff);
 635                 /* let current stabilize 2 - 4ms before measurements start */
 636                 usleep_range(2000, 4000);
 637                 lp55xx_write(chip, LP5523_REG_LED_TEST_CTRL,
 638                              LP5523_EN_LEDTEST | i);
 639                 /* ADC conversion time is 2.7 ms typically */
 640                 usleep_range(3000, 6000);
 641                 ret = lp55xx_read(chip, LP5523_REG_STATUS, &status);
 642                 if (ret < 0)
 643                         goto fail;
 644
 645                 if (!(status & LP5523_LEDTEST_DONE))
 646                         usleep_range(3000, 6000);/* Was not ready. Wait. */
 647
 648                 ret = lp55xx_read(chip, LP5523_REG_LED_TEST_ADC, &adc);
 649                 if (ret < 0)
 650                         goto fail;
 651
 652                 if (adc >= vdd || adc < LP5523_ADC_SHORTCIRC_LIM)
 653                         pos += sprintf(buf + pos, "LED %d FAIL\n", i);
 654
 655                 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0x00);
 656
 657                 /* Restore current */
 658                 lp55xx_write(chip, LP5523_REG_LED_CURRENT_BASE + i,
 659                         led->led_current);
 660                 led++;
 661         }
 662         if (pos == 0)
 663                 pos = sprintf(buf, "OK\n");
 664         goto release_lock;
 665 fail:
 666         pos = sprintf(buf, "FAIL\n");
 667
 668 release_lock:
 669         mutex_unlock(&chip->lock);
 670
 671         return pos;
 672 }
 673
 674 #define show_fader(nr)                                          \
 675 static ssize_t show_master_fader##nr(struct device *dev,        \
 676                             struct device_attribute *attr,      \
 677                             char *buf)                          \
 678 {                                                               \
 679         return show_master_fader(dev, attr, buf, nr);           \
 680 }
 681
 682 #define store_fader(nr)                                         \
 683 static ssize_t store_master_fader##nr(struct device *dev,       \
 684                              struct device_attribute *attr,     \
 685                              const char *buf, size_t len)       \
 686 {                                                               \
 687         return store_master_fader(dev, attr, buf, len, nr);     \
 688 }
 689
 690 static ssize_t show_master_fader(struct device *dev,
 691                                  struct device_attribute *attr,
 692                                  char *buf, int nr)
 693 {
 694         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 695         struct lp55xx_chip *chip = led->chip;
 696         int ret;
 697         u8 val;
 698
 699         mutex_lock(&chip->lock);
 700         ret = lp55xx_read(chip, LP5523_REG_MASTER_FADER_BASE + nr - 1, &val);
 701         mutex_unlock(&chip->lock);
 702
 703         if (ret == 0)
 704                 ret = sprintf(buf, "%u\n", val);
 705
 706         return ret;
 707 }
 708 show_fader(1)
 709 show_fader(2)
 710 show_fader(3)
 711
 712 static ssize_t store_master_fader(struct device *dev,
 713                                   struct device_attribute *attr,
 714                                   const char *buf, size_t len, int nr)
 715 {
 716         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 717         struct lp55xx_chip *chip = led->chip;
 718         int ret;
 719         unsigned long val;
 720
 721         if (kstrtoul(buf, 0, &val))
 722                 return -EINVAL;
 723
 724         if (val > 0xff)
 725                 return -EINVAL;
 726
 727         mutex_lock(&chip->lock);
 728         ret = lp55xx_write(chip, LP5523_REG_MASTER_FADER_BASE + nr - 1,
 729                            (u8)val);
 730         mutex_unlock(&chip->lock);
 731
 732         if (ret == 0)
 733                 ret = len;
 734
 735         return ret;
 736 }
 737 store_fader(1)
 738 store_fader(2)
 739 store_fader(3)
 740
 741 static ssize_t show_master_fader_leds(struct device *dev,
 742                                       struct device_attribute *attr,
 743                                       char *buf)
 744 {
 745         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 746         struct lp55xx_chip *chip = led->chip;
 747         int i, ret, pos = 0;
 748         u8 val;
 749
 750         mutex_lock(&chip->lock);
 751
 752         for (i = 0; i < LP5523_MAX_LEDS; i++) {
 753                 ret = lp55xx_read(chip, LP5523_REG_LED_CTRL_BASE + i, &val);
 754                 if (ret)
 755                         goto leave;
 756
 757                 val = (val & LP5523_FADER_MAPPING_MASK)
 758                         >> LP5523_FADER_MAPPING_SHIFT;
 759                 if (val > 3) {
 760                         ret = -EINVAL;
 761                         goto leave;
 762                 }
 763                 buf[pos++] = val + '0';
 764         }
 765         buf[pos++] = '\n';
 766         ret = pos;
 767 leave:
 768         mutex_unlock(&chip->lock);
 769         return ret;
 770 }
 771
 772 static ssize_t store_master_fader_leds(struct device *dev,
 773                                        struct device_attribute *attr,
 774                                        const char *buf, size_t len)
 775 {
 776         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 777         struct lp55xx_chip *chip = led->chip;
 778         int i, n, ret;
 779         u8 val;
 780
 781         n = min_t(int, len, LP5523_MAX_LEDS);
 782
 783         mutex_lock(&chip->lock);
 784
 785         for (i = 0; i < n; i++) {
 786                 if (buf[i] >= '0' && buf[i] <= '3') {
 787                         val = (buf[i] - '0') << LP5523_FADER_MAPPING_SHIFT;
 788                         ret = lp55xx_update_bits(chip,
 789                                                  LP5523_REG_LED_CTRL_BASE + i,
 790                                                  LP5523_FADER_MAPPING_MASK,
 791                                                  val);
 792                         if (ret)
 793                                 goto leave;
 794                 } else {
 795                         ret = -EINVAL;
 796                         goto leave;
 797                 }
 798         }
 799         ret = len;
 800 leave:
 801         mutex_unlock(&chip->lock);
 802         return ret;
 803 }
 804
 805 static int lp5523_led_brightness(struct lp55xx_led *led)
 806 {
 807         struct lp55xx_chip *chip = led->chip;
 808         int ret;
 809
 810         mutex_lock(&chip->lock);
 811         ret = lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + led->chan_nr,
 812                      led->brightness);
 813         mutex_unlock(&chip->lock);
 814         return ret;
 815 }
 816
 817 static LP55XX_DEV_ATTR_RW(engine1_mode, show_engine1_mode, store_engine1_mode);
 818 static LP55XX_DEV_ATTR_RW(engine2_mode, show_engine2_mode, store_engine2_mode);
 819 static LP55XX_DEV_ATTR_RW(engine3_mode, show_engine3_mode, store_engine3_mode);
 820 static LP55XX_DEV_ATTR_RW(engine1_leds, show_engine1_leds, store_engine1_leds);
 821 static LP55XX_DEV_ATTR_RW(engine2_leds, show_engine2_leds, store_engine2_leds);
 822 static LP55XX_DEV_ATTR_RW(engine3_leds, show_engine3_leds, store_engine3_leds);
 823 static LP55XX_DEV_ATTR_WO(engine1_load, store_engine1_load);
 824 static LP55XX_DEV_ATTR_WO(engine2_load, store_engine2_load);
 825 static LP55XX_DEV_ATTR_WO(engine3_load, store_engine3_load);
 826 static LP55XX_DEV_ATTR_RO(selftest, lp5523_selftest);
 827 static LP55XX_DEV_ATTR_RW(master_fader1, show_master_fader1,
 828                           store_master_fader1);
 829 static LP55XX_DEV_ATTR_RW(master_fader2, show_master_fader2,
 830                           store_master_fader2);
 831 static LP55XX_DEV_ATTR_RW(master_fader3, show_master_fader3,
 832                           store_master_fader3);
 833 static LP55XX_DEV_ATTR_RW(master_fader_leds, show_master_fader_leds,
 834                           store_master_fader_leds);
 835
 836 static struct attribute *lp5523_attributes[] = {
 837         &dev_attr_engine1_mode.attr,
 838         &dev_attr_engine2_mode.attr,
 839         &dev_attr_engine3_mode.attr,
 840         &dev_attr_engine1_load.attr,
 841         &dev_attr_engine2_load.attr,
 842         &dev_attr_engine3_load.attr,
 843         &dev_attr_engine1_leds.attr,
 844         &dev_attr_engine2_leds.attr,
 845         &dev_attr_engine3_leds.attr,
 846         &dev_attr_selftest.attr,
 847         &dev_attr_master_fader1.attr,
 848         &dev_attr_master_fader2.attr,
 849         &dev_attr_master_fader3.attr,
 850         &dev_attr_master_fader_leds.attr,
 851         NULL,
 852 };
 853
 854 static const struct attribute_group lp5523_group = {
 855         .attrs = lp5523_attributes,
 856 };
 857
 858 /* Chip specific configurations */
 859 static struct lp55xx_device_config lp5523_cfg = {
 860         .reset = {
 861                 .addr = LP5523_REG_RESET,
 862                 .val  = LP5523_RESET,
 863         },
 864         .enable = {
 865                 .addr = LP5523_REG_ENABLE,
 866                 .val  = LP5523_ENABLE,
 867         },
 868         .max_channel  = LP5523_MAX_LEDS,
 869         .post_init_device   = lp5523_post_init_device,
 870         .brightness_fn      = lp5523_led_brightness,
 871         .set_led_current    = lp5523_set_led_current,
 872         .firmware_cb        = lp5523_firmware_loaded,
 873         .run_engine         = lp5523_run_engine,
 874         .dev_attr_group     = &lp5523_group,
 875 };
 876
 877 static int lp5523_probe(struct i2c_client *client,
 878                         const struct i2c_device_id *id)
 879 {
 880         int ret;
 881         struct lp55xx_chip *chip;
 882         struct lp55xx_led *led;
 883         struct lp55xx_platform_data *pdata = dev_get_platdata(&client->dev);
 884         struct device_node *np = client->dev.of_node;
 885
 886         if (!pdata) {
 887                 if (np) {
 888                         pdata = lp55xx_of_populate_pdata(&client->dev, np);
 889                         if (IS_ERR(pdata))
 890                                 return PTR_ERR(pdata);
 891                 } else {
 892                         dev_err(&client->dev, "no platform data\n");
 893                         return -EINVAL;
 894                 }
 895         }
 896
 897         chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
 898         if (!chip)
 899                 return -ENOMEM;
 900
 901         led = devm_kzalloc(&client->dev,
 902                         sizeof(*led) * pdata->num_channels, GFP_KERNEL);
 903         if (!led)
 904                 return -ENOMEM;
 905
 906         chip->cl = client;
 907         chip->pdata = pdata;
 908         chip->cfg = &lp5523_cfg;
 909
 910         mutex_init(&chip->lock);
 911
 912         i2c_set_clientdata(client, led);
 913
 914         ret = lp55xx_init_device(chip);
 915         if (ret)
 916                 goto err_init;
 917
 918         dev_info(&client->dev, "%s Programmable led chip found\n", id->name);
 919
 920         ret = lp55xx_register_leds(led, chip);
 921         if (ret)
 922                 goto err_register_leds;
 923
 924         ret = lp55xx_register_sysfs(chip);
 925         if (ret) {
 926                 dev_err(&client->dev, "registering sysfs failed\n");
 927                 goto err_register_sysfs;
 928         }
 929
 930         return 0;
 931
 932 err_register_sysfs:
 933         lp55xx_unregister_leds(led, chip);
 934 err_register_leds:
 935         lp55xx_deinit_device(chip);
 936 err_init:
 937         return ret;
 938 }
 939
 940 static int lp5523_remove(struct i2c_client *client)
 941 {
 942         struct lp55xx_led *led = i2c_get_clientdata(client);
 943         struct lp55xx_chip *chip = led->chip;
 944
 945         lp5523_stop_all_engines(chip);
 946         lp55xx_unregister_sysfs(chip);
 947         lp55xx_unregister_leds(led, chip);
 948         lp55xx_deinit_device(chip);
 949
 950         return 0;
 951 }
 952
 953 static const struct i2c_device_id lp5523_id[] = {
 954         { "lp5523",  LP5523 },
 955         { "lp55231", LP55231 },
 956         { }
 957 };
 958
 959 MODULE_DEVICE_TABLE(i2c, lp5523_id);
 960
 961 #ifdef CONFIG_OF
 962 static const struct of_device_id of_lp5523_leds_match[] = {
 963         { .compatible = "national,lp5523", },
 964         { .compatible = "ti,lp55231", },
 965         {},
 966 };
 967
 968 MODULE_DEVICE_TABLE(of, of_lp5523_leds_match);
 969 #endif
 970
 971 static struct i2c_driver lp5523_driver = {
 972         .driver = {
 973                 .name   = "lp5523x",
 974                 .of_match_table = of_match_ptr(of_lp5523_leds_match),
 975         },
 976         .probe          = lp5523_probe,
 977         .remove         = lp5523_remove,
 978         .id_table       = lp5523_id,
 979 };
 980
 981 module_i2c_driver(lp5523_driver);
 982
 983 MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>");
 984 MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
 985 MODULE_DESCRIPTION("LP5523 LED engine");
 986 MODULE_LICENSE("GPL");