drivers/leds/leds-lp5523.c

   1 /*
   2  * lp5523.c - LP5523 LED Driver
   3  *
   4  * Copyright (C) 2010 Nokia Corporation
   5  *
   6  * Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * version 2 as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  20  * 02110-1301 USA
  21  */
  22
  23 #include <linux/module.h>
  24 #include <linux/init.h>
  25 #include <linux/i2c.h>
  26 #include <linux/mutex.h>
  27 #include <linux/gpio.h>
  28 #include <linux/interrupt.h>
  29 #include <linux/delay.h>
  30 #include <linux/ctype.h>
  31 #include <linux/spinlock.h>
  32 #include <linux/wait.h>
  33 #include <linux/leds.h>
  34 #include <linux/leds-lp5523.h>
  35 #include <linux/workqueue.h>
  36 #include <linux/slab.h>
  37
  38 #define LP5523_REG_ENABLE               0x00
  39 #define LP5523_REG_OP_MODE              0x01
  40 #define LP5523_REG_RATIOMETRIC_MSB      0x02
  41 #define LP5523_REG_RATIOMETRIC_LSB      0x03
  42 #define LP5523_REG_ENABLE_LEDS_MSB      0x04
  43 #define LP5523_REG_ENABLE_LEDS_LSB      0x05
  44 #define LP5523_REG_LED_CNTRL_BASE       0x06
  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_CHANNEL1_PC          0x37
  49 #define LP5523_REG_CHANNEL2_PC          0x38
  50 #define LP5523_REG_CHANNEL3_PC          0x39
  51 #define LP5523_REG_STATUS               0x3a
  52 #define LP5523_REG_GPO                  0x3b
  53 #define LP5523_REG_VARIABLE             0x3c
  54 #define LP5523_REG_RESET                0x3d
  55 #define LP5523_REG_TEMP_CTRL            0x3e
  56 #define LP5523_REG_TEMP_READ            0x3f
  57 #define LP5523_REG_TEMP_WRITE           0x40
  58 #define LP5523_REG_LED_TEST_CTRL        0x41
  59 #define LP5523_REG_LED_TEST_ADC         0x42
  60 #define LP5523_REG_ENG1_VARIABLE        0x45
  61 #define LP5523_REG_ENG2_VARIABLE        0x46
  62 #define LP5523_REG_ENG3_VARIABLE        0x47
  63 #define LP5523_REG_MASTER_FADER1        0x48
  64 #define LP5523_REG_MASTER_FADER2        0x49
  65 #define LP5523_REG_MASTER_FADER3        0x4a
  66 #define LP5523_REG_CH1_PROG_START       0x4c
  67 #define LP5523_REG_CH2_PROG_START       0x4d
  68 #define LP5523_REG_CH3_PROG_START       0x4e
  69 #define LP5523_REG_PROG_PAGE_SEL        0x4f
  70 #define LP5523_REG_PROG_MEM             0x50
  71
  72 #define LP5523_CMD_LOAD                 0x15 /* 00010101 */
  73 #define LP5523_CMD_RUN                  0x2a /* 00101010 */
  74 #define LP5523_CMD_DISABLED             0x00 /* 00000000 */
  75
  76 #define LP5523_ENABLE                   0x40
  77 #define LP5523_AUTO_INC                 0x40
  78 #define LP5523_PWR_SAVE                 0x20
  79 #define LP5523_PWM_PWR_SAVE             0x04
  80 #define LP5523_CP_1                     0x08
  81 #define LP5523_CP_1_5                   0x10
  82 #define LP5523_CP_AUTO                  0x18
  83 #define LP5523_INT_CLK                  0x01
  84 #define LP5523_AUTO_CLK                 0x02
  85 #define LP5523_EN_LEDTEST               0x80
  86 #define LP5523_LEDTEST_DONE             0x80
  87
  88 #define LP5523_DEFAULT_CURRENT          50 /* microAmps */
  89 #define LP5523_PROGRAM_LENGTH           32 /* in bytes */
  90 #define LP5523_PROGRAM_PAGES            6
  91 #define LP5523_ADC_SHORTCIRC_LIM        80
  92
  93 #define LP5523_LEDS                     9
  94 #define LP5523_ENGINES                  3
  95
  96 #define LP5523_ENG_MASK_BASE            0x30 /* 00110000 */
  97
  98 #define LP5523_ENG_STATUS_MASK          0x07 /* 00000111 */
  99
 100 #define LP5523_IRQ_FLAGS                IRQF_TRIGGER_FALLING
 101
 102 #define LP5523_EXT_CLK_USED             0x08
 103
 104 #define LED_ACTIVE(mux, led)            (!!(mux & (0x0001 << led)))
 105 #define SHIFT_MASK(id)                  (((id) - 1) * 2)
 106
 107 enum lp5523_chip_id {
 108         LP5523,
 109         LP55231,
 110 };
 111
 112 struct lp5523_engine {
 113         int             id;
 114         u8              mode;
 115         u8              prog_page;
 116         u8              mux_page;
 117         u16             led_mux;
 118         u8              engine_mask;
 119 };
 120
 121 struct lp5523_led {
 122         int                     id;
 123         u8                      chan_nr;
 124         u8                      led_current;
 125         u8                      max_current;
 126         struct led_classdev     cdev;
 127         struct work_struct      brightness_work;
 128         u8                      brightness;
 129 };
 130
 131 struct lp5523_chip {
 132         struct mutex            lock; /* Serialize control */
 133         struct i2c_client       *client;
 134         struct lp5523_engine    engines[LP5523_ENGINES];
 135         struct lp5523_led       leds[LP5523_LEDS];
 136         struct lp5523_platform_data *pdata;
 137         u8                      num_channels;
 138         u8                      num_leds;
 139 };
 140
 141 static inline struct lp5523_led *cdev_to_led(struct led_classdev *cdev)
 142 {
 143         return container_of(cdev, struct lp5523_led, cdev);
 144 }
 145
 146 static inline struct lp5523_chip *engine_to_lp5523(struct lp5523_engine *engine)
 147 {
 148         return container_of(engine, struct lp5523_chip,
 149                             engines[engine->id - 1]);
 150 }
 151
 152 static inline struct lp5523_chip *led_to_lp5523(struct lp5523_led *led)
 153 {
 154         return container_of(led, struct lp5523_chip,
 155                             leds[led->id]);
 156 }
 157
 158 static void lp5523_set_mode(struct lp5523_engine *engine, u8 mode);
 159 static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode);
 160 static int lp5523_load_program(struct lp5523_engine *engine, const u8 *pattern);
 161
 162 static void lp5523_led_brightness_work(struct work_struct *work);
 163
 164 static int lp5523_write(struct i2c_client *client, u8 reg, u8 value)
 165 {
 166         return i2c_smbus_write_byte_data(client, reg, value);
 167 }
 168
 169 static int lp5523_read(struct i2c_client *client, u8 reg, u8 *buf)
 170 {
 171         s32 ret = i2c_smbus_read_byte_data(client, reg);
 172
 173         if (ret < 0)
 174                 return -EIO;
 175
 176         *buf = ret;
 177         return 0;
 178 }
 179
 180 static int lp5523_detect(struct i2c_client *client)
 181 {
 182         int ret;
 183         u8 buf;
 184
 185         ret = lp5523_write(client, LP5523_REG_ENABLE, LP5523_ENABLE);
 186         if (ret)
 187                 return ret;
 188         ret = lp5523_read(client, LP5523_REG_ENABLE, &buf);
 189         if (ret)
 190                 return ret;
 191         if (buf == 0x40)
 192                 return 0;
 193         else
 194                 return -ENODEV;
 195 }
 196
 197 static int lp5523_configure(struct i2c_client *client)
 198 {
 199         struct lp5523_chip *chip = i2c_get_clientdata(client);
 200         int ret = 0;
 201         u8 status;
 202
 203         /* one pattern per engine setting led mux start and stop addresses */
 204         static const u8 pattern[][LP5523_PROGRAM_LENGTH] =  {
 205                 { 0x9c, 0x30, 0x9c, 0xb0, 0x9d, 0x80, 0xd8, 0x00, 0},
 206                 { 0x9c, 0x40, 0x9c, 0xc0, 0x9d, 0x80, 0xd8, 0x00, 0},
 207                 { 0x9c, 0x50, 0x9c, 0xd0, 0x9d, 0x80, 0xd8, 0x00, 0},
 208         };
 209
 210         ret |= lp5523_write(client, LP5523_REG_ENABLE, LP5523_ENABLE);
 211         /* Chip startup time is 500 us, 1 - 2 ms gives some margin */
 212         usleep_range(1000, 2000);
 213
 214         ret |= lp5523_write(client, LP5523_REG_CONFIG,
 215                             LP5523_AUTO_INC | LP5523_PWR_SAVE |
 216                             LP5523_CP_AUTO | LP5523_AUTO_CLK |
 217                             LP5523_PWM_PWR_SAVE);
 218
 219         /* turn on all leds */
 220         ret |= lp5523_write(client, LP5523_REG_ENABLE_LEDS_MSB, 0x01);
 221         ret |= lp5523_write(client, LP5523_REG_ENABLE_LEDS_LSB, 0xff);
 222
 223         /* hardcode 32 bytes of memory for each engine from program memory */
 224         ret |= lp5523_write(client, LP5523_REG_CH1_PROG_START, 0x00);
 225         ret |= lp5523_write(client, LP5523_REG_CH2_PROG_START, 0x10);
 226         ret |= lp5523_write(client, LP5523_REG_CH3_PROG_START, 0x20);
 227
 228         /* write led mux address space for each channel */
 229         ret |= lp5523_load_program(&chip->engines[0], pattern[0]);
 230         ret |= lp5523_load_program(&chip->engines[1], pattern[1]);
 231         ret |= lp5523_load_program(&chip->engines[2], pattern[2]);
 232
 233         if (ret) {
 234                 dev_err(&client->dev, "could not load mux programs\n");
 235                 return -1;
 236         }
 237
 238         /* set all engines exec state and mode to run 00101010 */
 239         ret |= lp5523_write(client, LP5523_REG_ENABLE,
 240                             (LP5523_CMD_RUN | LP5523_ENABLE));
 241
 242         ret |= lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_RUN);
 243
 244         if (ret) {
 245                 dev_err(&client->dev, "could not start mux programs\n");
 246                 return -1;
 247         }
 248
 249         /* Let the programs run for couple of ms and check the engine status */
 250         usleep_range(3000, 6000);
 251         lp5523_read(client, LP5523_REG_STATUS, &status);
 252         status &= LP5523_ENG_STATUS_MASK;
 253
 254         if (status == LP5523_ENG_STATUS_MASK) {
 255                 dev_dbg(&client->dev, "all engines configured\n");
 256         } else {
 257                 dev_info(&client->dev, "status == %x\n", status);
 258                 dev_err(&client->dev, "cound not configure LED engine\n");
 259                 return -1;
 260         }
 261
 262         dev_info(&client->dev, "disabling engines\n");
 263
 264         ret |= lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_DISABLED);
 265
 266         return ret;
 267 }
 268
 269 static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode)
 270 {
 271         struct lp5523_chip *chip = engine_to_lp5523(engine);
 272         struct i2c_client *client = chip->client;
 273         int ret;
 274         u8 engine_state;
 275
 276         ret = lp5523_read(client, LP5523_REG_OP_MODE, &engine_state);
 277         if (ret)
 278                 goto fail;
 279
 280         engine_state &= ~(engine->engine_mask);
 281
 282         /* set mode only for this engine */
 283         mode &= engine->engine_mask;
 284
 285         engine_state |= mode;
 286
 287         ret |= lp5523_write(client, LP5523_REG_OP_MODE, engine_state);
 288 fail:
 289         return ret;
 290 }
 291
 292 static int lp5523_load_mux(struct lp5523_engine *engine, u16 mux)
 293 {
 294         struct lp5523_chip *chip = engine_to_lp5523(engine);
 295         struct i2c_client *client = chip->client;
 296         int ret = 0;
 297
 298         ret |= lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
 299
 300         ret |= lp5523_write(client, LP5523_REG_PROG_PAGE_SEL, engine->mux_page);
 301         ret |= lp5523_write(client, LP5523_REG_PROG_MEM,
 302                             (u8)(mux >> 8));
 303         ret |= lp5523_write(client, LP5523_REG_PROG_MEM + 1, (u8)(mux));
 304         engine->led_mux = mux;
 305
 306         return ret;
 307 }
 308
 309 static int lp5523_load_program(struct lp5523_engine *engine, const u8 *pattern)
 310 {
 311         struct lp5523_chip *chip = engine_to_lp5523(engine);
 312         struct i2c_client *client = chip->client;
 313
 314         int ret = 0;
 315
 316         ret |= lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
 317
 318         ret |= lp5523_write(client, LP5523_REG_PROG_PAGE_SEL,
 319                             engine->prog_page);
 320         ret |= i2c_smbus_write_i2c_block_data(client, LP5523_REG_PROG_MEM,
 321                                               LP5523_PROGRAM_LENGTH, pattern);
 322
 323         return ret;
 324 }
 325
 326 static int lp5523_run_program(struct lp5523_engine *engine)
 327 {
 328         struct lp5523_chip *chip = engine_to_lp5523(engine);
 329         struct i2c_client *client = chip->client;
 330         int ret;
 331
 332         ret = lp5523_write(client, LP5523_REG_ENABLE,
 333                                         LP5523_CMD_RUN | LP5523_ENABLE);
 334         if (ret)
 335                 goto fail;
 336
 337         ret = lp5523_set_engine_mode(engine, LP5523_CMD_RUN);
 338 fail:
 339         return ret;
 340 }
 341
 342 static int lp5523_mux_parse(const char *buf, u16 *mux, size_t len)
 343 {
 344         int i;
 345         u16 tmp_mux = 0;
 346
 347         len = min_t(int, len, LP5523_LEDS);
 348         for (i = 0; i < len; i++) {
 349                 switch (buf[i]) {
 350                 case '1':
 351                         tmp_mux |= (1 << i);
 352                         break;
 353                 case '0':
 354                         break;
 355                 case '\n':
 356                         i = len;
 357                         break;
 358                 default:
 359                         return -1;
 360                 }
 361         }
 362         *mux = tmp_mux;
 363
 364         return 0;
 365 }
 366
 367 static void lp5523_mux_to_array(u16 led_mux, char *array)
 368 {
 369         int i, pos = 0;
 370         for (i = 0; i < LP5523_LEDS; i++)
 371                 pos += sprintf(array + pos, "%x", LED_ACTIVE(led_mux, i));
 372
 373         array[pos] = '\0';
 374 }
 375
 376 /*--------------------------------------------------------------*/
 377 /*                      Sysfs interface                         */
 378 /*--------------------------------------------------------------*/
 379
 380 static ssize_t show_engine_leds(struct device *dev,
 381                             struct device_attribute *attr,
 382                             char *buf, int nr)
 383 {
 384         struct i2c_client *client = to_i2c_client(dev);
 385         struct lp5523_chip *chip = i2c_get_clientdata(client);
 386         char mux[LP5523_LEDS + 1];
 387
 388         lp5523_mux_to_array(chip->engines[nr - 1].led_mux, mux);
 389
 390         return sprintf(buf, "%s\n", mux);
 391 }
 392
 393 #define show_leds(nr)                                                   \
 394 static ssize_t show_engine##nr##_leds(struct device *dev,               \
 395                             struct device_attribute *attr,              \
 396                             char *buf)                                  \
 397 {                                                                       \
 398         return show_engine_leds(dev, attr, buf, nr);                    \
 399 }
 400 show_leds(1)
 401 show_leds(2)
 402 show_leds(3)
 403
 404 static ssize_t store_engine_leds(struct device *dev,
 405                              struct device_attribute *attr,
 406                              const char *buf, size_t len, int nr)
 407 {
 408         struct i2c_client *client = to_i2c_client(dev);
 409         struct lp5523_chip *chip = i2c_get_clientdata(client);
 410         u16 mux = 0;
 411         ssize_t ret;
 412
 413         if (lp5523_mux_parse(buf, &mux, len))
 414                 return -EINVAL;
 415
 416         mutex_lock(&chip->lock);
 417         ret = -EINVAL;
 418         if (chip->engines[nr - 1].mode != LP5523_CMD_LOAD)
 419                 goto leave;
 420
 421         if (lp5523_load_mux(&chip->engines[nr - 1], mux))
 422                 goto leave;
 423
 424         ret = len;
 425 leave:
 426         mutex_unlock(&chip->lock);
 427         return ret;
 428 }
 429
 430 #define store_leds(nr)                                          \
 431 static ssize_t store_engine##nr##_leds(struct device *dev,      \
 432                              struct device_attribute *attr,     \
 433                              const char *buf, size_t len)       \
 434 {                                                               \
 435         return store_engine_leds(dev, attr, buf, len, nr);      \
 436 }
 437 store_leds(1)
 438 store_leds(2)
 439 store_leds(3)
 440
 441 static ssize_t lp5523_selftest(struct device *dev,
 442                                struct device_attribute *attr,
 443                                char *buf)
 444 {
 445         struct i2c_client *client = to_i2c_client(dev);
 446         struct lp5523_chip *chip = i2c_get_clientdata(client);
 447         int i, ret, pos = 0;
 448         int led = 0;
 449         u8 status, adc, vdd;
 450
 451         mutex_lock(&chip->lock);
 452
 453         ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
 454         if (ret < 0)
 455                 goto fail;
 456
 457         /* Check that ext clock is really in use if requested */
 458         if ((chip->pdata) && (chip->pdata->clock_mode == LP5523_CLOCK_EXT))
 459                 if  ((status & LP5523_EXT_CLK_USED) == 0)
 460                         goto fail;
 461
 462         /* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */
 463         lp5523_write(chip->client, LP5523_REG_LED_TEST_CTRL,
 464                                     LP5523_EN_LEDTEST | 16);
 465         usleep_range(3000, 6000); /* ADC conversion time is typically 2.7 ms */
 466         ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
 467         if (!(status & LP5523_LEDTEST_DONE))
 468                 usleep_range(3000, 6000); /* Was not ready. Wait little bit */
 469
 470         ret |= lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &vdd);
 471         vdd--;  /* There may be some fluctuation in measurement */
 472
 473         for (i = 0; i < LP5523_LEDS; i++) {
 474                 /* Skip non-existing channels */
 475                 if (chip->pdata->led_config[i].led_current == 0)
 476                         continue;
 477
 478                 /* Set default current */
 479                 lp5523_write(chip->client,
 480                         LP5523_REG_LED_CURRENT_BASE + i,
 481                         chip->pdata->led_config[i].led_current);
 482
 483                 lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0xff);
 484                 /* let current stabilize 2 - 4ms before measurements start */
 485                 usleep_range(2000, 4000);
 486                 lp5523_write(chip->client,
 487                              LP5523_REG_LED_TEST_CTRL,
 488                              LP5523_EN_LEDTEST | i);
 489                 /* ADC conversion time is 2.7 ms typically */
 490                 usleep_range(3000, 6000);
 491                 ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
 492                 if (!(status & LP5523_LEDTEST_DONE))
 493                         usleep_range(3000, 6000);/* Was not ready. Wait. */
 494                 ret |= lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &adc);
 495
 496                 if (adc >= vdd || adc < LP5523_ADC_SHORTCIRC_LIM)
 497                         pos += sprintf(buf + pos, "LED %d FAIL\n", i);
 498
 499                 lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0x00);
 500
 501                 /* Restore current */
 502                 lp5523_write(chip->client,
 503                         LP5523_REG_LED_CURRENT_BASE + i,
 504                         chip->leds[led].led_current);
 505                 led++;
 506         }
 507         if (pos == 0)
 508                 pos = sprintf(buf, "OK\n");
 509         goto release_lock;
 510 fail:
 511         pos = sprintf(buf, "FAIL\n");
 512
 513 release_lock:
 514         mutex_unlock(&chip->lock);
 515
 516         return pos;
 517 }
 518
 519 static void lp5523_set_brightness(struct led_classdev *cdev,
 520                              enum led_brightness brightness)
 521 {
 522         struct lp5523_led *led = cdev_to_led(cdev);
 523
 524         led->brightness = (u8)brightness;
 525
 526         schedule_work(&led->brightness_work);
 527 }
 528
 529 static void lp5523_led_brightness_work(struct work_struct *work)
 530 {
 531         struct lp5523_led *led = container_of(work,
 532                                               struct lp5523_led,
 533                                               brightness_work);
 534         struct lp5523_chip *chip = led_to_lp5523(led);
 535         struct i2c_client *client = chip->client;
 536
 537         mutex_lock(&chip->lock);
 538
 539         lp5523_write(client, LP5523_REG_LED_PWM_BASE + led->chan_nr,
 540                      led->brightness);
 541
 542         mutex_unlock(&chip->lock);
 543 }
 544
 545 static int lp5523_do_store_load(struct lp5523_engine *engine,
 546                                 const char *buf, size_t len)
 547 {
 548         struct lp5523_chip *chip = engine_to_lp5523(engine);
 549         struct i2c_client *client = chip->client;
 550         int  ret, nrchars, offset = 0, i = 0;
 551         char c[3];
 552         unsigned cmd;
 553         u8 pattern[LP5523_PROGRAM_LENGTH] = {0};
 554
 555         if (engine->mode != LP5523_CMD_LOAD)
 556                 return -EINVAL;
 557
 558         while ((offset < len - 1) && (i < LP5523_PROGRAM_LENGTH)) {
 559                 /* separate sscanfs because length is working only for %s */
 560                 ret = sscanf(buf + offset, "%2s%n ", c, &nrchars);
 561                 ret = sscanf(c, "%2x", &cmd);
 562                 if (ret != 1)
 563                         goto fail;
 564                 pattern[i] = (u8)cmd;
 565
 566                 offset += nrchars;
 567                 i++;
 568         }
 569
 570         /* Each instruction is 16bit long. Check that length is even */
 571         if (i % 2)
 572                 goto fail;
 573
 574         mutex_lock(&chip->lock);
 575         ret = lp5523_load_program(engine, pattern);
 576         mutex_unlock(&chip->lock);
 577
 578         if (ret) {
 579                 dev_err(&client->dev, "failed loading pattern\n");
 580                 return ret;
 581         }
 582
 583         return len;
 584 fail:
 585         dev_err(&client->dev, "wrong pattern format\n");
 586         return -EINVAL;
 587 }
 588
 589 static ssize_t store_engine_load(struct device *dev,
 590                                      struct device_attribute *attr,
 591                                      const char *buf, size_t len, int nr)
 592 {
 593         struct i2c_client *client = to_i2c_client(dev);
 594         struct lp5523_chip *chip = i2c_get_clientdata(client);
 595         return lp5523_do_store_load(&chip->engines[nr - 1], buf, len);
 596 }
 597
 598 #define store_load(nr)                                                  \
 599 static ssize_t store_engine##nr##_load(struct device *dev,              \
 600                                      struct device_attribute *attr,     \
 601                                      const char *buf, size_t len)       \
 602 {                                                                       \
 603         return store_engine_load(dev, attr, buf, len, nr);              \
 604 }
 605 store_load(1)
 606 store_load(2)
 607 store_load(3)
 608
 609 static ssize_t show_engine_mode(struct device *dev,
 610                                 struct device_attribute *attr,
 611                                 char *buf, int nr)
 612 {
 613         struct i2c_client *client = to_i2c_client(dev);
 614         struct lp5523_chip *chip = i2c_get_clientdata(client);
 615         switch (chip->engines[nr - 1].mode) {
 616         case LP5523_CMD_RUN:
 617                 return sprintf(buf, "run\n");
 618         case LP5523_CMD_LOAD:
 619                 return sprintf(buf, "load\n");
 620         case LP5523_CMD_DISABLED:
 621                 return sprintf(buf, "disabled\n");
 622         default:
 623                 return sprintf(buf, "disabled\n");
 624         }
 625 }
 626
 627 #define show_mode(nr)                                                   \
 628 static ssize_t show_engine##nr##_mode(struct device *dev,               \
 629                                     struct device_attribute *attr,      \
 630                                     char *buf)                          \
 631 {                                                                       \
 632         return show_engine_mode(dev, attr, buf, nr);                    \
 633 }
 634 show_mode(1)
 635 show_mode(2)
 636 show_mode(3)
 637
 638 static ssize_t store_engine_mode(struct device *dev,
 639                                  struct device_attribute *attr,
 640                                  const char *buf, size_t len, int nr)
 641 {
 642         struct i2c_client *client = to_i2c_client(dev);
 643         struct lp5523_chip *chip = i2c_get_clientdata(client);
 644         struct lp5523_engine *engine = &chip->engines[nr - 1];
 645         mutex_lock(&chip->lock);
 646
 647         if (!strncmp(buf, "run", 3))
 648                 lp5523_set_mode(engine, LP5523_CMD_RUN);
 649         else if (!strncmp(buf, "load", 4))
 650                 lp5523_set_mode(engine, LP5523_CMD_LOAD);
 651         else if (!strncmp(buf, "disabled", 8))
 652                 lp5523_set_mode(engine, LP5523_CMD_DISABLED);
 653
 654         mutex_unlock(&chip->lock);
 655         return len;
 656 }
 657
 658 #define store_mode(nr)                                                  \
 659 static ssize_t store_engine##nr##_mode(struct device *dev,              \
 660                                      struct device_attribute *attr,     \
 661                                      const char *buf, size_t len)       \
 662 {                                                                       \
 663         return store_engine_mode(dev, attr, buf, len, nr);              \
 664 }
 665 store_mode(1)
 666 store_mode(2)
 667 store_mode(3)
 668
 669 static ssize_t show_max_current(struct device *dev,
 670                             struct device_attribute *attr,
 671                             char *buf)
 672 {
 673         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 674         struct lp5523_led *led = cdev_to_led(led_cdev);
 675
 676         return sprintf(buf, "%d\n", led->max_current);
 677 }
 678
 679 static ssize_t show_current(struct device *dev,
 680                             struct device_attribute *attr,
 681                             char *buf)
 682 {
 683         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 684         struct lp5523_led *led = cdev_to_led(led_cdev);
 685
 686         return sprintf(buf, "%d\n", led->led_current);
 687 }
 688
 689 static ssize_t store_current(struct device *dev,
 690                              struct device_attribute *attr,
 691                              const char *buf, size_t len)
 692 {
 693         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 694         struct lp5523_led *led = cdev_to_led(led_cdev);
 695         struct lp5523_chip *chip = led_to_lp5523(led);
 696         ssize_t ret;
 697         unsigned long curr;
 698
 699         if (strict_strtoul(buf, 0, &curr))
 700                 return -EINVAL;
 701
 702         if (curr > led->max_current)
 703                 return -EINVAL;
 704
 705         mutex_lock(&chip->lock);
 706         ret = lp5523_write(chip->client,
 707                         LP5523_REG_LED_CURRENT_BASE + led->chan_nr,
 708                         (u8)curr);
 709         mutex_unlock(&chip->lock);
 710
 711         if (ret < 0)
 712                 return ret;
 713
 714         led->led_current = (u8)curr;
 715
 716         return len;
 717 }
 718
 719 /* led class device attributes */
 720 static DEVICE_ATTR(led_current, S_IRUGO | S_IWUSR, show_current, store_current);
 721 static DEVICE_ATTR(max_current, S_IRUGO , show_max_current, NULL);
 722
 723 static struct attribute *lp5523_led_attributes[] = {
 724         &dev_attr_led_current.attr,
 725         &dev_attr_max_current.attr,
 726         NULL,
 727 };
 728
 729 static struct attribute_group lp5523_led_attribute_group = {
 730         .attrs = lp5523_led_attributes
 731 };
 732
 733 /* device attributes */
 734 static DEVICE_ATTR(engine1_mode, S_IRUGO | S_IWUSR,
 735                    show_engine1_mode, store_engine1_mode);
 736 static DEVICE_ATTR(engine2_mode, S_IRUGO | S_IWUSR,
 737                    show_engine2_mode, store_engine2_mode);
 738 static DEVICE_ATTR(engine3_mode, S_IRUGO | S_IWUSR,
 739                    show_engine3_mode, store_engine3_mode);
 740 static DEVICE_ATTR(engine1_leds, S_IRUGO | S_IWUSR,
 741                    show_engine1_leds, store_engine1_leds);
 742 static DEVICE_ATTR(engine2_leds, S_IRUGO | S_IWUSR,
 743                    show_engine2_leds, store_engine2_leds);
 744 static DEVICE_ATTR(engine3_leds, S_IRUGO | S_IWUSR,
 745                    show_engine3_leds, store_engine3_leds);
 746 static DEVICE_ATTR(engine1_load, S_IWUSR, NULL, store_engine1_load);
 747 static DEVICE_ATTR(engine2_load, S_IWUSR, NULL, store_engine2_load);
 748 static DEVICE_ATTR(engine3_load, S_IWUSR, NULL, store_engine3_load);
 749 static DEVICE_ATTR(selftest, S_IRUGO, lp5523_selftest, NULL);
 750
 751 static struct attribute *lp5523_attributes[] = {
 752         &dev_attr_engine1_mode.attr,
 753         &dev_attr_engine2_mode.attr,
 754         &dev_attr_engine3_mode.attr,
 755         &dev_attr_selftest.attr,
 756         &dev_attr_engine1_load.attr,
 757         &dev_attr_engine1_leds.attr,
 758         &dev_attr_engine2_load.attr,
 759         &dev_attr_engine2_leds.attr,
 760         &dev_attr_engine3_load.attr,
 761         &dev_attr_engine3_leds.attr,
 762         NULL,
 763 };
 764
 765 static const struct attribute_group lp5523_group = {
 766         .attrs = lp5523_attributes,
 767 };
 768
 769 static int lp5523_register_sysfs(struct i2c_client *client)
 770 {
 771         struct device *dev = &client->dev;
 772         int ret;
 773
 774         ret = sysfs_create_group(&dev->kobj, &lp5523_group);
 775         if (ret < 0)
 776                 return ret;
 777
 778         return 0;
 779 }
 780
 781 static void lp5523_unregister_sysfs(struct i2c_client *client)
 782 {
 783         struct lp5523_chip *chip = i2c_get_clientdata(client);
 784         struct device *dev = &client->dev;
 785         int i;
 786
 787         sysfs_remove_group(&dev->kobj, &lp5523_group);
 788
 789         for (i = 0; i < chip->num_leds; i++)
 790                 sysfs_remove_group(&chip->leds[i].cdev.dev->kobj,
 791                                 &lp5523_led_attribute_group);
 792 }
 793
 794 /*--------------------------------------------------------------*/
 795 /*                      Set chip operating mode                 */
 796 /*--------------------------------------------------------------*/
 797 static void lp5523_set_mode(struct lp5523_engine *engine, u8 mode)
 798 {
 799         /* if in that mode already do nothing, except for run */
 800         if (mode == engine->mode && mode != LP5523_CMD_RUN)
 801                 return;
 802
 803         switch (mode) {
 804         case LP5523_CMD_RUN:
 805                 lp5523_run_program(engine);
 806                 break;
 807         case LP5523_CMD_LOAD:
 808                 lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED);
 809                 lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
 810                 break;
 811         case LP5523_CMD_DISABLED:
 812                 lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED);
 813                 break;
 814         default:
 815                 return;
 816         }
 817
 818         engine->mode = mode;
 819 }
 820
 821 /*--------------------------------------------------------------*/
 822 /*                      Probe, Attach, Remove                   */
 823 /*--------------------------------------------------------------*/
 824 static int __init lp5523_init_engine(struct lp5523_engine *engine, int id)
 825 {
 826         if (id < 1 || id > LP5523_ENGINES)
 827                 return -1;
 828         engine->id = id;
 829         engine->engine_mask = LP5523_ENG_MASK_BASE >> SHIFT_MASK(id);
 830         engine->prog_page = id - 1;
 831         engine->mux_page = id + 2;
 832
 833         return 0;
 834 }
 835
 836 static int __devinit lp5523_init_led(struct lp5523_led *led, struct device *dev,
 837                            int chan, struct lp5523_platform_data *pdata,
 838                            const char *chip_name)
 839 {
 840         char name[32];
 841         int res;
 842
 843         if (chan >= LP5523_LEDS)
 844                 return -EINVAL;
 845
 846         if (pdata->led_config[chan].led_current) {
 847                 led->led_current = pdata->led_config[chan].led_current;
 848                 led->max_current = pdata->led_config[chan].max_current;
 849                 led->chan_nr = pdata->led_config[chan].chan_nr;
 850
 851                 if (led->chan_nr >= LP5523_LEDS) {
 852                         dev_err(dev, "Use channel numbers between 0 and %d\n",
 853                                 LP5523_LEDS - 1);
 854                         return -EINVAL;
 855                 }
 856
 857                 if (pdata->led_config[chan].name) {
 858                         led->cdev.name = pdata->led_config[chan].name;
 859                 } else {
 860                         snprintf(name, sizeof(name), "%s:channel%d",
 861                                 pdata->label ? : chip_name, chan);
 862                         led->cdev.name = name;
 863                 }
 864
 865                 led->cdev.brightness_set = lp5523_set_brightness;
 866                 res = led_classdev_register(dev, &led->cdev);
 867                 if (res < 0) {
 868                         dev_err(dev, "couldn't register led on channel %d\n",
 869                                 chan);
 870                         return res;
 871                 }
 872                 res = sysfs_create_group(&led->cdev.dev->kobj,
 873                                 &lp5523_led_attribute_group);
 874                 if (res < 0) {
 875                         dev_err(dev, "couldn't register current attribute\n");
 876                         led_classdev_unregister(&led->cdev);
 877                         return res;
 878                 }
 879         } else {
 880                 led->led_current = 0;
 881         }
 882         return 0;
 883 }
 884
 885 static int __devinit lp5523_probe(struct i2c_client *client,
 886                         const struct i2c_device_id *id)
 887 {
 888         struct lp5523_chip              *chip;
 889         struct lp5523_platform_data     *pdata;
 890         int ret, i, led;
 891
 892         chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
 893         if (!chip)
 894                 return -ENOMEM;
 895
 896         i2c_set_clientdata(client, chip);
 897         chip->client = client;
 898
 899         pdata = client->dev.platform_data;
 900
 901         if (!pdata) {
 902                 dev_err(&client->dev, "no platform data\n");
 903                 return -EINVAL;
 904         }
 905
 906         mutex_init(&chip->lock);
 907
 908         chip->pdata   = pdata;
 909
 910         if (pdata->setup_resources) {
 911                 ret = pdata->setup_resources();
 912                 if (ret < 0)
 913                         return ret;
 914         }
 915
 916         if (pdata->enable) {
 917                 pdata->enable(0);
 918                 usleep_range(1000, 2000); /* Keep enable down at least 1ms */
 919                 pdata->enable(1);
 920                 usleep_range(1000, 2000); /* 500us abs min. */
 921         }
 922
 923         lp5523_write(client, LP5523_REG_RESET, 0xff);
 924         usleep_range(10000, 20000); /*
 925                                      * Exact value is not available. 10 - 20ms
 926                                      * appears to be enough for reset.
 927                                      */
 928         ret = lp5523_detect(client);
 929         if (ret)
 930                 goto fail1;
 931
 932         dev_info(&client->dev, "%s Programmable led chip found\n", id->name);
 933
 934         /* Initialize engines */
 935         for (i = 0; i < ARRAY_SIZE(chip->engines); i++) {
 936                 ret = lp5523_init_engine(&chip->engines[i], i + 1);
 937                 if (ret) {
 938                         dev_err(&client->dev, "error initializing engine\n");
 939                         goto fail1;
 940                 }
 941         }
 942         ret = lp5523_configure(client);
 943         if (ret < 0) {
 944                 dev_err(&client->dev, "error configuring chip\n");
 945                 goto fail1;
 946         }
 947
 948         /* Initialize leds */
 949         chip->num_channels = pdata->num_channels;
 950         chip->num_leds = 0;
 951         led = 0;
 952         for (i = 0; i < pdata->num_channels; i++) {
 953                 /* Do not initialize channels that are not connected */
 954                 if (pdata->led_config[i].led_current == 0)
 955                         continue;
 956
 957                 INIT_WORK(&chip->leds[led].brightness_work,
 958                         lp5523_led_brightness_work);
 959
 960                 ret = lp5523_init_led(&chip->leds[led], &client->dev, i, pdata,
 961                                 id->name);
 962                 if (ret) {
 963                         dev_err(&client->dev, "error initializing leds\n");
 964                         goto fail2;
 965                 }
 966                 chip->num_leds++;
 967
 968                 chip->leds[led].id = led;
 969                 /* Set LED current */
 970                 lp5523_write(client,
 971                           LP5523_REG_LED_CURRENT_BASE + chip->leds[led].chan_nr,
 972                           chip->leds[led].led_current);
 973
 974                 led++;
 975         }
 976
 977         ret = lp5523_register_sysfs(client);
 978         if (ret) {
 979                 dev_err(&client->dev, "registering sysfs failed\n");
 980                 goto fail2;
 981         }
 982         return ret;
 983 fail2:
 984         for (i = 0; i < chip->num_leds; i++) {
 985                 led_classdev_unregister(&chip->leds[i].cdev);
 986                 flush_work(&chip->leds[i].brightness_work);
 987         }
 988 fail1:
 989         if (pdata->enable)
 990                 pdata->enable(0);
 991         if (pdata->release_resources)
 992                 pdata->release_resources();
 993         return ret;
 994 }
 995
 996 static int lp5523_remove(struct i2c_client *client)
 997 {
 998         struct lp5523_chip *chip = i2c_get_clientdata(client);
 999         int i;
1000
1001         /* Disable engine mode */
1002         lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_DISABLED);
1003
1004         lp5523_unregister_sysfs(client);
1005
1006         for (i = 0; i < chip->num_leds; i++) {
1007                 led_classdev_unregister(&chip->leds[i].cdev);
1008                 flush_work(&chip->leds[i].brightness_work);
1009         }
1010
1011         if (chip->pdata->enable)
1012                 chip->pdata->enable(0);
1013         if (chip->pdata->release_resources)
1014                 chip->pdata->release_resources();
1015         return 0;
1016 }
1017
1018 static const struct i2c_device_id lp5523_id[] = {
1019         { "lp5523",  LP5523 },
1020         { "lp55231", LP55231 },
1021         { }
1022 };
1023
1024 MODULE_DEVICE_TABLE(i2c, lp5523_id);
1025
1026 static struct i2c_driver lp5523_driver = {
1027         .driver = {
1028                 .name   = "lp5523x",
1029         },
1030         .probe          = lp5523_probe,
1031         .remove         = lp5523_remove,
1032         .id_table       = lp5523_id,
1033 };
1034
1035 module_i2c_driver(lp5523_driver);
1036
1037 MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>");
1038 MODULE_DESCRIPTION("LP5523 LED engine");
1039 MODULE_LICENSE("GPL");