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 #include <linux/platform_data/leds-lp55xx.h>
  38
  39 #include "leds-lp55xx-common.h"
  40
  41 #define LP5523_REG_ENABLE               0x00
  42 #define LP5523_REG_OP_MODE              0x01
  43 #define LP5523_REG_RATIOMETRIC_MSB      0x02
  44 #define LP5523_REG_RATIOMETRIC_LSB      0x03
  45 #define LP5523_REG_ENABLE_LEDS_MSB      0x04
  46 #define LP5523_REG_ENABLE_LEDS_LSB      0x05
  47 #define LP5523_REG_LED_CNTRL_BASE       0x06
  48 #define LP5523_REG_LED_PWM_BASE         0x16
  49 #define LP5523_REG_LED_CURRENT_BASE     0x26
  50 #define LP5523_REG_CONFIG               0x36
  51 #define LP5523_REG_CHANNEL1_PC          0x37
  52 #define LP5523_REG_CHANNEL2_PC          0x38
  53 #define LP5523_REG_CHANNEL3_PC          0x39
  54 #define LP5523_REG_STATUS               0x3a
  55 #define LP5523_REG_GPO                  0x3b
  56 #define LP5523_REG_VARIABLE             0x3c
  57 #define LP5523_REG_RESET                0x3d
  58 #define LP5523_REG_TEMP_CTRL            0x3e
  59 #define LP5523_REG_TEMP_READ            0x3f
  60 #define LP5523_REG_TEMP_WRITE           0x40
  61 #define LP5523_REG_LED_TEST_CTRL        0x41
  62 #define LP5523_REG_LED_TEST_ADC         0x42
  63 #define LP5523_REG_ENG1_VARIABLE        0x45
  64 #define LP5523_REG_ENG2_VARIABLE        0x46
  65 #define LP5523_REG_ENG3_VARIABLE        0x47
  66 #define LP5523_REG_MASTER_FADER1        0x48
  67 #define LP5523_REG_MASTER_FADER2        0x49
  68 #define LP5523_REG_MASTER_FADER3        0x4a
  69 #define LP5523_REG_CH1_PROG_START       0x4c
  70 #define LP5523_REG_CH2_PROG_START       0x4d
  71 #define LP5523_REG_CH3_PROG_START       0x4e
  72 #define LP5523_REG_PROG_PAGE_SEL        0x4f
  73 #define LP5523_REG_PROG_MEM             0x50
  74
  75 #define LP5523_CMD_LOAD                 0x15 /* 00010101 */
  76 #define LP5523_CMD_RUN                  0x2a /* 00101010 */
  77 #define LP5523_CMD_DISABLED             0x00 /* 00000000 */
  78
  79 #define LP5523_ENABLE                   0x40
  80 #define LP5523_AUTO_INC                 0x40
  81 #define LP5523_PWR_SAVE                 0x20
  82 #define LP5523_PWM_PWR_SAVE             0x04
  83 #define LP5523_CP_1                     0x08
  84 #define LP5523_CP_1_5                   0x10
  85 #define LP5523_CP_AUTO                  0x18
  86 #define LP5523_INT_CLK                  0x01
  87 #define LP5523_AUTO_CLK                 0x02
  88 #define LP5523_EN_LEDTEST               0x80
  89 #define LP5523_LEDTEST_DONE             0x80
  90 #define LP5523_RESET                    0xFF
  91
  92 #define LP5523_DEFAULT_CURRENT          50 /* microAmps */
  93 #define LP5523_PROGRAM_LENGTH           32 /* in bytes */
  94 #define LP5523_PROGRAM_PAGES            6
  95 #define LP5523_ADC_SHORTCIRC_LIM        80
  96
  97 #define LP5523_LEDS                     9
  98 #define LP5523_ENGINES                  3
  99
 100 #define LP5523_ENG_MASK_BASE            0x30 /* 00110000 */
 101
 102 #define LP5523_ENG_STATUS_MASK          0x07 /* 00000111 */
 103
 104 #define LP5523_IRQ_FLAGS                IRQF_TRIGGER_FALLING
 105
 106 #define LP5523_EXT_CLK_USED             0x08
 107
 108 #define LED_ACTIVE(mux, led)            (!!(mux & (0x0001 << led)))
 109 #define SHIFT_MASK(id)                  (((id) - 1) * 2)
 110
 111 enum lp5523_chip_id {
 112         LP5523,
 113         LP55231,
 114 };
 115
 116 struct lp5523_engine {
 117         int             id;
 118         u8              mode;
 119         u8              prog_page;
 120         u8              mux_page;
 121         u16             led_mux;
 122         u8              engine_mask;
 123 };
 124
 125 struct lp5523_led {
 126         int                     id;
 127         u8                      chan_nr;
 128         u8                      led_current;
 129         u8                      max_current;
 130         struct led_classdev     cdev;
 131         struct work_struct      brightness_work;
 132         u8                      brightness;
 133 };
 134
 135 struct lp5523_chip {
 136         struct mutex            lock; /* Serialize control */
 137         struct i2c_client       *client;
 138         struct lp5523_engine    engines[LP5523_ENGINES];
 139         struct lp5523_led       leds[LP5523_LEDS];
 140         struct lp5523_platform_data *pdata;
 141         u8                      num_channels;
 142         u8                      num_leds;
 143 };
 144
 145 static inline struct lp5523_led *cdev_to_led(struct led_classdev *cdev)
 146 {
 147         return container_of(cdev, struct lp5523_led, cdev);
 148 }
 149
 150 static inline struct lp5523_chip *engine_to_lp5523(struct lp5523_engine *engine)
 151 {
 152         return container_of(engine, struct lp5523_chip,
 153                             engines[engine->id - 1]);
 154 }
 155
 156 static inline struct lp5523_chip *led_to_lp5523(struct lp5523_led *led)
 157 {
 158         return container_of(led, struct lp5523_chip,
 159                             leds[led->id]);
 160 }
 161
 162 static void lp5523_set_mode(struct lp5523_engine *engine, u8 mode);
 163 static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode);
 164 static int lp5523_load_program(struct lp5523_engine *engine, const u8 *pattern);
 165
 166 static void lp5523_led_brightness_work(struct work_struct *work);
 167
 168 static int lp5523_write(struct i2c_client *client, u8 reg, u8 value)
 169 {
 170         return i2c_smbus_write_byte_data(client, reg, value);
 171 }
 172
 173 static int lp5523_read(struct i2c_client *client, u8 reg, u8 *buf)
 174 {
 175         s32 ret = i2c_smbus_read_byte_data(client, reg);
 176
 177         if (ret < 0)
 178                 return ret;
 179
 180         *buf = ret;
 181         return 0;
 182 }
 183
 184 static int lp5523_post_init_device(struct lp55xx_chip *chip)
 185 {
 186         int ret;
 187
 188         ret = lp55xx_write(chip, LP5523_REG_ENABLE, LP5523_ENABLE);
 189         if (ret)
 190                 return ret;
 191
 192         /* Chip startup time is 500 us, 1 - 2 ms gives some margin */
 193         usleep_range(1000, 2000);
 194
 195         ret = lp55xx_write(chip, LP5523_REG_CONFIG,
 196                             LP5523_AUTO_INC | LP5523_PWR_SAVE |
 197                             LP5523_CP_AUTO | LP5523_AUTO_CLK |
 198                             LP5523_PWM_PWR_SAVE);
 199         if (ret)
 200                 return ret;
 201
 202         /* turn on all leds */
 203         ret = lp55xx_write(chip, LP5523_REG_ENABLE_LEDS_MSB, 0x01);
 204         if (ret)
 205                 return ret;
 206
 207         return lp55xx_write(chip, LP5523_REG_ENABLE_LEDS_LSB, 0xff);
 208 }
 209
 210 static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode)
 211 {
 212         struct lp5523_chip *chip = engine_to_lp5523(engine);
 213         struct i2c_client *client = chip->client;
 214         int ret;
 215         u8 engine_state;
 216
 217         ret = lp5523_read(client, LP5523_REG_OP_MODE, &engine_state);
 218         if (ret)
 219                 goto fail;
 220
 221         engine_state &= ~(engine->engine_mask);
 222
 223         /* set mode only for this engine */
 224         mode &= engine->engine_mask;
 225
 226         engine_state |= mode;
 227
 228         ret |= lp5523_write(client, LP5523_REG_OP_MODE, engine_state);
 229 fail:
 230         return ret;
 231 }
 232
 233 static int lp5523_load_mux(struct lp5523_engine *engine, u16 mux)
 234 {
 235         struct lp5523_chip *chip = engine_to_lp5523(engine);
 236         struct i2c_client *client = chip->client;
 237         int ret = 0;
 238
 239         ret |= lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
 240
 241         ret |= lp5523_write(client, LP5523_REG_PROG_PAGE_SEL, engine->mux_page);
 242         ret |= lp5523_write(client, LP5523_REG_PROG_MEM,
 243                             (u8)(mux >> 8));
 244         ret |= lp5523_write(client, LP5523_REG_PROG_MEM + 1, (u8)(mux));
 245         engine->led_mux = mux;
 246
 247         return ret;
 248 }
 249
 250 static int lp5523_load_program(struct lp5523_engine *engine, const u8 *pattern)
 251 {
 252         struct lp5523_chip *chip = engine_to_lp5523(engine);
 253         struct i2c_client *client = chip->client;
 254
 255         int ret = 0;
 256
 257         ret |= lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
 258
 259         ret |= lp5523_write(client, LP5523_REG_PROG_PAGE_SEL,
 260                             engine->prog_page);
 261         ret |= i2c_smbus_write_i2c_block_data(client, LP5523_REG_PROG_MEM,
 262                                               LP5523_PROGRAM_LENGTH, pattern);
 263
 264         return ret;
 265 }
 266
 267 static int lp5523_run_program(struct lp5523_engine *engine)
 268 {
 269         struct lp5523_chip *chip = engine_to_lp5523(engine);
 270         struct i2c_client *client = chip->client;
 271         int ret;
 272
 273         ret = lp5523_write(client, LP5523_REG_ENABLE,
 274                                         LP5523_CMD_RUN | LP5523_ENABLE);
 275         if (ret)
 276                 goto fail;
 277
 278         ret = lp5523_set_engine_mode(engine, LP5523_CMD_RUN);
 279 fail:
 280         return ret;
 281 }
 282
 283 static int lp5523_mux_parse(const char *buf, u16 *mux, size_t len)
 284 {
 285         int i;
 286         u16 tmp_mux = 0;
 287
 288         len = min_t(int, len, LP5523_LEDS);
 289         for (i = 0; i < len; i++) {
 290                 switch (buf[i]) {
 291                 case '1':
 292                         tmp_mux |= (1 << i);
 293                         break;
 294                 case '0':
 295                         break;
 296                 case '\n':
 297                         i = len;
 298                         break;
 299                 default:
 300                         return -1;
 301                 }
 302         }
 303         *mux = tmp_mux;
 304
 305         return 0;
 306 }
 307
 308 static void lp5523_mux_to_array(u16 led_mux, char *array)
 309 {
 310         int i, pos = 0;
 311         for (i = 0; i < LP5523_LEDS; i++)
 312                 pos += sprintf(array + pos, "%x", LED_ACTIVE(led_mux, i));
 313
 314         array[pos] = '\0';
 315 }
 316
 317 /*--------------------------------------------------------------*/
 318 /*                      Sysfs interface                         */
 319 /*--------------------------------------------------------------*/
 320
 321 static ssize_t show_engine_leds(struct device *dev,
 322                             struct device_attribute *attr,
 323                             char *buf, int nr)
 324 {
 325         struct i2c_client *client = to_i2c_client(dev);
 326         struct lp5523_chip *chip = i2c_get_clientdata(client);
 327         char mux[LP5523_LEDS + 1];
 328
 329         lp5523_mux_to_array(chip->engines[nr - 1].led_mux, mux);
 330
 331         return sprintf(buf, "%s\n", mux);
 332 }
 333
 334 #define show_leds(nr)                                                   \
 335 static ssize_t show_engine##nr##_leds(struct device *dev,               \
 336                             struct device_attribute *attr,              \
 337                             char *buf)                                  \
 338 {                                                                       \
 339         return show_engine_leds(dev, attr, buf, nr);                    \
 340 }
 341 show_leds(1)
 342 show_leds(2)
 343 show_leds(3)
 344
 345 static ssize_t store_engine_leds(struct device *dev,
 346                              struct device_attribute *attr,
 347                              const char *buf, size_t len, int nr)
 348 {
 349         struct i2c_client *client = to_i2c_client(dev);
 350         struct lp5523_chip *chip = i2c_get_clientdata(client);
 351         u16 mux = 0;
 352         ssize_t ret;
 353
 354         if (lp5523_mux_parse(buf, &mux, len))
 355                 return -EINVAL;
 356
 357         mutex_lock(&chip->lock);
 358         ret = -EINVAL;
 359         if (chip->engines[nr - 1].mode != LP5523_CMD_LOAD)
 360                 goto leave;
 361
 362         if (lp5523_load_mux(&chip->engines[nr - 1], mux))
 363                 goto leave;
 364
 365         ret = len;
 366 leave:
 367         mutex_unlock(&chip->lock);
 368         return ret;
 369 }
 370
 371 #define store_leds(nr)                                          \
 372 static ssize_t store_engine##nr##_leds(struct device *dev,      \
 373                              struct device_attribute *attr,     \
 374                              const char *buf, size_t len)       \
 375 {                                                               \
 376         return store_engine_leds(dev, attr, buf, len, nr);      \
 377 }
 378 store_leds(1)
 379 store_leds(2)
 380 store_leds(3)
 381
 382 static ssize_t lp5523_selftest(struct device *dev,
 383                                struct device_attribute *attr,
 384                                char *buf)
 385 {
 386         struct i2c_client *client = to_i2c_client(dev);
 387         struct lp5523_chip *chip = i2c_get_clientdata(client);
 388         int i, ret, pos = 0;
 389         int led = 0;
 390         u8 status, adc, vdd;
 391
 392         mutex_lock(&chip->lock);
 393
 394         ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
 395         if (ret < 0)
 396                 goto fail;
 397
 398         /* Check that ext clock is really in use if requested */
 399         if ((chip->pdata) && (chip->pdata->clock_mode == LP5523_CLOCK_EXT))
 400                 if  ((status & LP5523_EXT_CLK_USED) == 0)
 401                         goto fail;
 402
 403         /* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */
 404         lp5523_write(chip->client, LP5523_REG_LED_TEST_CTRL,
 405                                     LP5523_EN_LEDTEST | 16);
 406         usleep_range(3000, 6000); /* ADC conversion time is typically 2.7 ms */
 407         ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
 408         if (ret < 0)
 409                 goto fail;
 410
 411         if (!(status & LP5523_LEDTEST_DONE))
 412                 usleep_range(3000, 6000); /* Was not ready. Wait little bit */
 413
 414         ret = lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &vdd);
 415         if (ret < 0)
 416                 goto fail;
 417
 418         vdd--;  /* There may be some fluctuation in measurement */
 419
 420         for (i = 0; i < LP5523_LEDS; i++) {
 421                 /* Skip non-existing channels */
 422                 if (chip->pdata->led_config[i].led_current == 0)
 423                         continue;
 424
 425                 /* Set default current */
 426                 lp5523_write(chip->client,
 427                         LP5523_REG_LED_CURRENT_BASE + i,
 428                         chip->pdata->led_config[i].led_current);
 429
 430                 lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0xff);
 431                 /* let current stabilize 2 - 4ms before measurements start */
 432                 usleep_range(2000, 4000);
 433                 lp5523_write(chip->client,
 434                              LP5523_REG_LED_TEST_CTRL,
 435                              LP5523_EN_LEDTEST | i);
 436                 /* ADC conversion time is 2.7 ms typically */
 437                 usleep_range(3000, 6000);
 438                 ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
 439                 if (ret < 0)
 440                         goto fail;
 441
 442                 if (!(status & LP5523_LEDTEST_DONE))
 443                         usleep_range(3000, 6000);/* Was not ready. Wait. */
 444                 ret = lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &adc);
 445                 if (ret < 0)
 446                         goto fail;
 447
 448                 if (adc >= vdd || adc < LP5523_ADC_SHORTCIRC_LIM)
 449                         pos += sprintf(buf + pos, "LED %d FAIL\n", i);
 450
 451                 lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0x00);
 452
 453                 /* Restore current */
 454                 lp5523_write(chip->client,
 455                         LP5523_REG_LED_CURRENT_BASE + i,
 456                         chip->leds[led].led_current);
 457                 led++;
 458         }
 459         if (pos == 0)
 460                 pos = sprintf(buf, "OK\n");
 461         goto release_lock;
 462 fail:
 463         pos = sprintf(buf, "FAIL\n");
 464
 465 release_lock:
 466         mutex_unlock(&chip->lock);
 467
 468         return pos;
 469 }
 470
 471 static void lp5523_set_brightness(struct led_classdev *cdev,
 472                              enum led_brightness brightness)
 473 {
 474         struct lp5523_led *led = cdev_to_led(cdev);
 475
 476         led->brightness = (u8)brightness;
 477
 478         schedule_work(&led->brightness_work);
 479 }
 480
 481 static void lp5523_led_brightness_work(struct work_struct *work)
 482 {
 483         struct lp5523_led *led = container_of(work,
 484                                               struct lp5523_led,
 485                                               brightness_work);
 486         struct lp5523_chip *chip = led_to_lp5523(led);
 487         struct i2c_client *client = chip->client;
 488
 489         mutex_lock(&chip->lock);
 490
 491         lp5523_write(client, LP5523_REG_LED_PWM_BASE + led->chan_nr,
 492                      led->brightness);
 493
 494         mutex_unlock(&chip->lock);
 495 }
 496
 497 static int lp5523_do_store_load(struct lp5523_engine *engine,
 498                                 const char *buf, size_t len)
 499 {
 500         struct lp5523_chip *chip = engine_to_lp5523(engine);
 501         struct i2c_client *client = chip->client;
 502         int  ret, nrchars, offset = 0, i = 0;
 503         char c[3];
 504         unsigned cmd;
 505         u8 pattern[LP5523_PROGRAM_LENGTH] = {0};
 506
 507         if (engine->mode != LP5523_CMD_LOAD)
 508                 return -EINVAL;
 509
 510         while ((offset < len - 1) && (i < LP5523_PROGRAM_LENGTH)) {
 511                 /* separate sscanfs because length is working only for %s */
 512                 ret = sscanf(buf + offset, "%2s%n ", c, &nrchars);
 513                 ret = sscanf(c, "%2x", &cmd);
 514                 if (ret != 1)
 515                         goto fail;
 516                 pattern[i] = (u8)cmd;
 517
 518                 offset += nrchars;
 519                 i++;
 520         }
 521
 522         /* Each instruction is 16bit long. Check that length is even */
 523         if (i % 2)
 524                 goto fail;
 525
 526         mutex_lock(&chip->lock);
 527         ret = lp5523_load_program(engine, pattern);
 528         mutex_unlock(&chip->lock);
 529
 530         if (ret) {
 531                 dev_err(&client->dev, "failed loading pattern\n");
 532                 return ret;
 533         }
 534
 535         return len;
 536 fail:
 537         dev_err(&client->dev, "wrong pattern format\n");
 538         return -EINVAL;
 539 }
 540
 541 static ssize_t store_engine_load(struct device *dev,
 542                                      struct device_attribute *attr,
 543                                      const char *buf, size_t len, int nr)
 544 {
 545         struct i2c_client *client = to_i2c_client(dev);
 546         struct lp5523_chip *chip = i2c_get_clientdata(client);
 547         return lp5523_do_store_load(&chip->engines[nr - 1], buf, len);
 548 }
 549
 550 #define store_load(nr)                                                  \
 551 static ssize_t store_engine##nr##_load(struct device *dev,              \
 552                                      struct device_attribute *attr,     \
 553                                      const char *buf, size_t len)       \
 554 {                                                                       \
 555         return store_engine_load(dev, attr, buf, len, nr);              \
 556 }
 557 store_load(1)
 558 store_load(2)
 559 store_load(3)
 560
 561 static ssize_t show_engine_mode(struct device *dev,
 562                                 struct device_attribute *attr,
 563                                 char *buf, int nr)
 564 {
 565         struct i2c_client *client = to_i2c_client(dev);
 566         struct lp5523_chip *chip = i2c_get_clientdata(client);
 567         switch (chip->engines[nr - 1].mode) {
 568         case LP5523_CMD_RUN:
 569                 return sprintf(buf, "run\n");
 570         case LP5523_CMD_LOAD:
 571                 return sprintf(buf, "load\n");
 572         case LP5523_CMD_DISABLED:
 573                 return sprintf(buf, "disabled\n");
 574         default:
 575                 return sprintf(buf, "disabled\n");
 576         }
 577 }
 578
 579 #define show_mode(nr)                                                   \
 580 static ssize_t show_engine##nr##_mode(struct device *dev,               \
 581                                     struct device_attribute *attr,      \
 582                                     char *buf)                          \
 583 {                                                                       \
 584         return show_engine_mode(dev, attr, buf, nr);                    \
 585 }
 586 show_mode(1)
 587 show_mode(2)
 588 show_mode(3)
 589
 590 static ssize_t store_engine_mode(struct device *dev,
 591                                  struct device_attribute *attr,
 592                                  const char *buf, size_t len, int nr)
 593 {
 594         struct i2c_client *client = to_i2c_client(dev);
 595         struct lp5523_chip *chip = i2c_get_clientdata(client);
 596         struct lp5523_engine *engine = &chip->engines[nr - 1];
 597         mutex_lock(&chip->lock);
 598
 599         if (!strncmp(buf, "run", 3))
 600                 lp5523_set_mode(engine, LP5523_CMD_RUN);
 601         else if (!strncmp(buf, "load", 4))
 602                 lp5523_set_mode(engine, LP5523_CMD_LOAD);
 603         else if (!strncmp(buf, "disabled", 8))
 604                 lp5523_set_mode(engine, LP5523_CMD_DISABLED);
 605
 606         mutex_unlock(&chip->lock);
 607         return len;
 608 }
 609
 610 #define store_mode(nr)                                                  \
 611 static ssize_t store_engine##nr##_mode(struct device *dev,              \
 612                                      struct device_attribute *attr,     \
 613                                      const char *buf, size_t len)       \
 614 {                                                                       \
 615         return store_engine_mode(dev, attr, buf, len, nr);              \
 616 }
 617 store_mode(1)
 618 store_mode(2)
 619 store_mode(3)
 620
 621 static ssize_t show_max_current(struct device *dev,
 622                             struct device_attribute *attr,
 623                             char *buf)
 624 {
 625         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 626         struct lp5523_led *led = cdev_to_led(led_cdev);
 627
 628         return sprintf(buf, "%d\n", led->max_current);
 629 }
 630
 631 static ssize_t show_current(struct device *dev,
 632                             struct device_attribute *attr,
 633                             char *buf)
 634 {
 635         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 636         struct lp5523_led *led = cdev_to_led(led_cdev);
 637
 638         return sprintf(buf, "%d\n", led->led_current);
 639 }
 640
 641 static ssize_t store_current(struct device *dev,
 642                              struct device_attribute *attr,
 643                              const char *buf, size_t len)
 644 {
 645         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 646         struct lp5523_led *led = cdev_to_led(led_cdev);
 647         struct lp5523_chip *chip = led_to_lp5523(led);
 648         ssize_t ret;
 649         unsigned long curr;
 650
 651         if (kstrtoul(buf, 0, &curr))
 652                 return -EINVAL;
 653
 654         if (curr > led->max_current)
 655                 return -EINVAL;
 656
 657         mutex_lock(&chip->lock);
 658         ret = lp5523_write(chip->client,
 659                         LP5523_REG_LED_CURRENT_BASE + led->chan_nr,
 660                         (u8)curr);
 661         mutex_unlock(&chip->lock);
 662
 663         if (ret < 0)
 664                 return ret;
 665
 666         led->led_current = (u8)curr;
 667
 668         return len;
 669 }
 670
 671 /* led class device attributes */
 672 static DEVICE_ATTR(led_current, S_IRUGO | S_IWUSR, show_current, store_current);
 673 static DEVICE_ATTR(max_current, S_IRUGO , show_max_current, NULL);
 674
 675 static struct attribute *lp5523_led_attributes[] = {
 676         &dev_attr_led_current.attr,
 677         &dev_attr_max_current.attr,
 678         NULL,
 679 };
 680
 681 static struct attribute_group lp5523_led_attribute_group = {
 682         .attrs = lp5523_led_attributes
 683 };
 684
 685 /* device attributes */
 686 static DEVICE_ATTR(engine1_mode, S_IRUGO | S_IWUSR,
 687                    show_engine1_mode, store_engine1_mode);
 688 static DEVICE_ATTR(engine2_mode, S_IRUGO | S_IWUSR,
 689                    show_engine2_mode, store_engine2_mode);
 690 static DEVICE_ATTR(engine3_mode, S_IRUGO | S_IWUSR,
 691                    show_engine3_mode, store_engine3_mode);
 692 static DEVICE_ATTR(engine1_leds, S_IRUGO | S_IWUSR,
 693                    show_engine1_leds, store_engine1_leds);
 694 static DEVICE_ATTR(engine2_leds, S_IRUGO | S_IWUSR,
 695                    show_engine2_leds, store_engine2_leds);
 696 static DEVICE_ATTR(engine3_leds, S_IRUGO | S_IWUSR,
 697                    show_engine3_leds, store_engine3_leds);
 698 static DEVICE_ATTR(engine1_load, S_IWUSR, NULL, store_engine1_load);
 699 static DEVICE_ATTR(engine2_load, S_IWUSR, NULL, store_engine2_load);
 700 static DEVICE_ATTR(engine3_load, S_IWUSR, NULL, store_engine3_load);
 701 static DEVICE_ATTR(selftest, S_IRUGO, lp5523_selftest, NULL);
 702
 703 static struct attribute *lp5523_attributes[] = {
 704         &dev_attr_engine1_mode.attr,
 705         &dev_attr_engine2_mode.attr,
 706         &dev_attr_engine3_mode.attr,
 707         &dev_attr_selftest.attr,
 708         &dev_attr_engine1_load.attr,
 709         &dev_attr_engine1_leds.attr,
 710         &dev_attr_engine2_load.attr,
 711         &dev_attr_engine2_leds.attr,
 712         &dev_attr_engine3_load.attr,
 713         &dev_attr_engine3_leds.attr,
 714         NULL,
 715 };
 716
 717 static const struct attribute_group lp5523_group = {
 718         .attrs = lp5523_attributes,
 719 };
 720
 721 static int lp5523_register_sysfs(struct i2c_client *client)
 722 {
 723         struct device *dev = &client->dev;
 724         int ret;
 725
 726         ret = sysfs_create_group(&dev->kobj, &lp5523_group);
 727         if (ret < 0)
 728                 return ret;
 729
 730         return 0;
 731 }
 732
 733 static void lp5523_unregister_sysfs(struct i2c_client *client)
 734 {
 735         struct lp5523_chip *chip = i2c_get_clientdata(client);
 736         struct device *dev = &client->dev;
 737         int i;
 738
 739         sysfs_remove_group(&dev->kobj, &lp5523_group);
 740
 741         for (i = 0; i < chip->num_leds; i++)
 742                 sysfs_remove_group(&chip->leds[i].cdev.dev->kobj,
 743                                 &lp5523_led_attribute_group);
 744 }
 745
 746 /*--------------------------------------------------------------*/
 747 /*                      Set chip operating mode                 */
 748 /*--------------------------------------------------------------*/
 749 static void lp5523_set_mode(struct lp5523_engine *engine, u8 mode)
 750 {
 751         /* if in that mode already do nothing, except for run */
 752         if (mode == engine->mode && mode != LP5523_CMD_RUN)
 753                 return;
 754
 755         switch (mode) {
 756         case LP5523_CMD_RUN:
 757                 lp5523_run_program(engine);
 758                 break;
 759         case LP5523_CMD_LOAD:
 760                 lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED);
 761                 lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
 762                 break;
 763         case LP5523_CMD_DISABLED:
 764                 lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED);
 765                 break;
 766         default:
 767                 return;
 768         }
 769
 770         engine->mode = mode;
 771 }
 772
 773 /*--------------------------------------------------------------*/
 774 /*                      Probe, Attach, Remove                   */
 775 /*--------------------------------------------------------------*/
 776 static int lp5523_init_led(struct lp5523_led *led, struct device *dev,
 777                            int chan, struct lp5523_platform_data *pdata,
 778                            const char *chip_name)
 779 {
 780         char name[32];
 781         int res;
 782
 783         if (chan >= LP5523_LEDS)
 784                 return -EINVAL;
 785
 786         if (pdata->led_config[chan].led_current) {
 787                 led->led_current = pdata->led_config[chan].led_current;
 788                 led->max_current = pdata->led_config[chan].max_current;
 789                 led->chan_nr = pdata->led_config[chan].chan_nr;
 790
 791                 if (led->chan_nr >= LP5523_LEDS) {
 792                         dev_err(dev, "Use channel numbers between 0 and %d\n",
 793                                 LP5523_LEDS - 1);
 794                         return -EINVAL;
 795                 }
 796
 797                 if (pdata->led_config[chan].name) {
 798                         led->cdev.name = pdata->led_config[chan].name;
 799                 } else {
 800                         snprintf(name, sizeof(name), "%s:channel%d",
 801                                 pdata->label ? : chip_name, chan);
 802                         led->cdev.name = name;
 803                 }
 804
 805                 led->cdev.brightness_set = lp5523_set_brightness;
 806                 res = led_classdev_register(dev, &led->cdev);
 807                 if (res < 0) {
 808                         dev_err(dev, "couldn't register led on channel %d\n",
 809                                 chan);
 810                         return res;
 811                 }
 812                 res = sysfs_create_group(&led->cdev.dev->kobj,
 813                                 &lp5523_led_attribute_group);
 814                 if (res < 0) {
 815                         dev_err(dev, "couldn't register current attribute\n");
 816                         led_classdev_unregister(&led->cdev);
 817                         return res;
 818                 }
 819         } else {
 820                 led->led_current = 0;
 821         }
 822         return 0;
 823 }
 824
 825 static int lp5523_register_leds(struct lp5523_chip *chip, const char *name)
 826 {
 827         struct lp5523_platform_data *pdata = chip->pdata;
 828         struct i2c_client *client = chip->client;
 829         int i;
 830         int led;
 831         int ret;
 832
 833         /* Initialize leds */
 834         chip->num_channels = pdata->num_channels;
 835         chip->num_leds = 0;
 836         led = 0;
 837         for (i = 0; i < pdata->num_channels; i++) {
 838                 /* Do not initialize channels that are not connected */
 839                 if (pdata->led_config[i].led_current == 0)
 840                         continue;
 841
 842                 INIT_WORK(&chip->leds[led].brightness_work,
 843                         lp5523_led_brightness_work);
 844
 845                 ret = lp5523_init_led(&chip->leds[led], &client->dev, i, pdata,
 846                                 name);
 847                 if (ret) {
 848                         dev_err(&client->dev, "error initializing leds\n");
 849                         return ret;
 850                 }
 851                 chip->num_leds++;
 852
 853                 chip->leds[led].id = led;
 854                 /* Set LED current */
 855                 lp5523_write(client,
 856                           LP5523_REG_LED_CURRENT_BASE + chip->leds[led].chan_nr,
 857                           chip->leds[led].led_current);
 858
 859                 led++;
 860         }
 861
 862         return 0;
 863 }
 864
 865 static void lp5523_unregister_leds(struct lp5523_chip *chip)
 866 {
 867         int i;
 868
 869         for (i = 0; i < chip->num_leds; i++) {
 870                 led_classdev_unregister(&chip->leds[i].cdev);
 871                 flush_work(&chip->leds[i].brightness_work);
 872         }
 873 }
 874
 875 static void lp5523_deinit_device(struct lp5523_chip *chip)
 876 {
 877         struct lp5523_platform_data *pdata = chip->pdata;
 878
 879         if (pdata->enable)
 880                 pdata->enable(0);
 881         if (pdata->release_resources)
 882                 pdata->release_resources();
 883 }
 884
 885 /* Chip specific configurations */
 886 static struct lp55xx_device_config lp5523_cfg = {
 887         .reset = {
 888                 .addr = LP5523_REG_RESET,
 889                 .val  = LP5523_RESET,
 890         },
 891         .enable = {
 892                 .addr = LP5523_REG_ENABLE,
 893                 .val  = LP5523_ENABLE,
 894         },
 895         .post_init_device   = lp5523_post_init_device,
 896 };
 897
 898 static int lp5523_probe(struct i2c_client *client,
 899                         const struct i2c_device_id *id)
 900 {
 901         struct lp5523_chip              *old_chip = NULL;
 902         int ret;
 903         struct lp55xx_chip *chip;
 904         struct lp55xx_led *led;
 905         struct lp55xx_platform_data *pdata = client->dev.platform_data;
 906
 907         if (!pdata) {
 908                 dev_err(&client->dev, "no platform data\n");
 909                 return -EINVAL;
 910         }
 911
 912         chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
 913         if (!chip)
 914                 return -ENOMEM;
 915
 916         led = devm_kzalloc(&client->dev,
 917                         sizeof(*led) * pdata->num_channels, GFP_KERNEL);
 918         if (!led)
 919                 return -ENOMEM;
 920
 921         chip->cl = client;
 922         chip->pdata = pdata;
 923         chip->cfg = &lp5523_cfg;
 924
 925         mutex_init(&chip->lock);
 926
 927         i2c_set_clientdata(client, led);
 928
 929         ret = lp55xx_init_device(chip);
 930         if (ret)
 931                 goto err_init;
 932
 933         dev_info(&client->dev, "%s Programmable led chip found\n", id->name);
 934
 935         ret = lp5523_register_leds(old_chip, id->name);
 936         if (ret)
 937                 goto fail2;
 938
 939         ret = lp5523_register_sysfs(client);
 940         if (ret) {
 941                 dev_err(&client->dev, "registering sysfs failed\n");
 942                 goto fail2;
 943         }
 944         return ret;
 945 fail2:
 946         lp5523_unregister_leds(old_chip);
 947         lp5523_deinit_device(old_chip);
 948 err_init:
 949         return ret;
 950 }
 951
 952 static int lp5523_remove(struct i2c_client *client)
 953 {
 954         struct lp5523_chip *old_chip = i2c_get_clientdata(client);
 955
 956         /* Disable engine mode */
 957         lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_DISABLED);
 958
 959         lp5523_unregister_sysfs(client);
 960
 961         lp5523_unregister_leds(old_chip);
 962
 963         lp5523_deinit_device(old_chip);
 964         return 0;
 965 }
 966
 967 static const struct i2c_device_id lp5523_id[] = {
 968         { "lp5523",  LP5523 },
 969         { "lp55231", LP55231 },
 970         { }
 971 };
 972
 973 MODULE_DEVICE_TABLE(i2c, lp5523_id);
 974
 975 static struct i2c_driver lp5523_driver = {
 976         .driver = {
 977                 .name   = "lp5523x",
 978         },
 979         .probe          = lp5523_probe,
 980         .remove         = lp5523_remove,
 981         .id_table       = lp5523_id,
 982 };
 983
 984 module_i2c_driver(lp5523_driver);
 985
 986 MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>");
 987 MODULE_DESCRIPTION("LP5523 LED engine");
 988 MODULE_LICENSE("GPL");