drivers/leds/leds-bd2802.c

   1 /*
   2  * leds-bd2802.c - RGB LED Driver
   3  *
   4  * Copyright (C) 2009 Samsung Electronics
   5  * Kim Kyuwon <q1.kim@samsung.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  * Datasheet: http://www.rohm.com/products/databook/driver/pdf/bd2802gu-e.pdf
  12  *
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/i2c.h>
  17 #include <linux/gpio.h>
  18 #include <linux/delay.h>
  19 #include <linux/leds.h>
  20 #include <linux/leds-bd2802.h>
  21 #include <linux/slab.h>
  22 #include <linux/pm.h>
  23
  24 #define LED_CTL(rgb2en, rgb1en) ((rgb2en) << 4 | ((rgb1en) << 0))
  25
  26 #define BD2802_LED_OFFSET               0xa
  27 #define BD2802_COLOR_OFFSET             0x3
  28
  29 #define BD2802_REG_CLKSETUP             0x00
  30 #define BD2802_REG_CONTROL              0x01
  31 #define BD2802_REG_HOURSETUP            0x02
  32 #define BD2802_REG_CURRENT1SETUP        0x03
  33 #define BD2802_REG_CURRENT2SETUP        0x04
  34 #define BD2802_REG_WAVEPATTERN          0x05
  35
  36 #define BD2802_CURRENT_032              0x10 /* 3.2mA */
  37 #define BD2802_CURRENT_000              0x00 /* 0.0mA */
  38
  39 #define BD2802_PATTERN_FULL             0x07
  40 #define BD2802_PATTERN_HALF             0x03
  41
  42 enum led_ids {
  43         LED1,
  44         LED2,
  45         LED_NUM,
  46 };
  47
  48 enum led_colors {
  49         RED,
  50         GREEN,
  51         BLUE,
  52 };
  53
  54 enum led_bits {
  55         BD2802_OFF,
  56         BD2802_BLINK,
  57         BD2802_ON,
  58 };
  59
  60 /*
  61  * State '0' : 'off'
  62  * State '1' : 'blink'
  63  * State '2' : 'on'.
  64  */
  65 struct led_state {
  66         unsigned r:2;
  67         unsigned g:2;
  68         unsigned b:2;
  69 };
  70
  71 struct bd2802_led {
  72         struct bd2802_led_platform_data *pdata;
  73         struct i2c_client               *client;
  74         struct rw_semaphore             rwsem;
  75
  76         struct led_state                led[2];
  77
  78         /*
  79          * Making led_classdev as array is not recommended, because array
  80          * members prevent using 'container_of' macro. So repetitive works
  81          * are needed.
  82          */
  83         struct led_classdev             cdev_led1r;
  84         struct led_classdev             cdev_led1g;
  85         struct led_classdev             cdev_led1b;
  86         struct led_classdev             cdev_led2r;
  87         struct led_classdev             cdev_led2g;
  88         struct led_classdev             cdev_led2b;
  89
  90         /*
  91          * Advanced Configuration Function(ADF) mode:
  92          * In ADF mode, user can set registers of BD2802GU directly,
  93          * therefore BD2802GU doesn't enter reset state.
  94          */
  95         int                             adf_on;
  96
  97         enum led_ids                    led_id;
  98         enum led_colors                 color;
  99         enum led_bits                   state;
 100
 101         /* General attributes of RGB LEDs */
 102         int                             wave_pattern;
 103         int                             rgb_current;
 104 };
 105
 106
 107 /*--------------------------------------------------------------*/
 108 /*      BD2802GU helper functions                                       */
 109 /*--------------------------------------------------------------*/
 110
 111 static inline int bd2802_is_rgb_off(struct bd2802_led *led, enum led_ids id,
 112                                                         enum led_colors color)
 113 {
 114         switch (color) {
 115         case RED:
 116                 return !led->led[id].r;
 117         case GREEN:
 118                 return !led->led[id].g;
 119         case BLUE:
 120                 return !led->led[id].b;
 121         default:
 122                 dev_err(&led->client->dev, "%s: Invalid color\n", __func__);
 123                 return -EINVAL;
 124         }
 125 }
 126
 127 static inline int bd2802_is_led_off(struct bd2802_led *led, enum led_ids id)
 128 {
 129         if (led->led[id].r || led->led[id].g || led->led[id].b)
 130                 return 0;
 131
 132         return 1;
 133 }
 134
 135 static inline int bd2802_is_all_off(struct bd2802_led *led)
 136 {
 137         int i;
 138
 139         for (i = 0; i < LED_NUM; i++)
 140                 if (!bd2802_is_led_off(led, i))
 141                         return 0;
 142
 143         return 1;
 144 }
 145
 146 static inline u8 bd2802_get_base_offset(enum led_ids id, enum led_colors color)
 147 {
 148         return id * BD2802_LED_OFFSET + color * BD2802_COLOR_OFFSET;
 149 }
 150
 151 static inline u8 bd2802_get_reg_addr(enum led_ids id, enum led_colors color,
 152                                                                 u8 reg_offset)
 153 {
 154         return reg_offset + bd2802_get_base_offset(id, color);
 155 }
 156
 157
 158 /*--------------------------------------------------------------*/
 159 /*      BD2802GU core functions                                 */
 160 /*--------------------------------------------------------------*/
 161
 162 static int bd2802_write_byte(struct i2c_client *client, u8 reg, u8 val)
 163 {
 164         int ret = i2c_smbus_write_byte_data(client, reg, val);
 165         if (ret >= 0)
 166                 return 0;
 167
 168         dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n",
 169                                                 __func__, reg, val, ret);
 170
 171         return ret;
 172 }
 173
 174 static void bd2802_update_state(struct bd2802_led *led, enum led_ids id,
 175                                 enum led_colors color, enum led_bits led_bit)
 176 {
 177         int i;
 178         u8 value;
 179
 180         for (i = 0; i < LED_NUM; i++) {
 181                 if (i == id) {
 182                         switch (color) {
 183                         case RED:
 184                                 led->led[i].r = led_bit;
 185                                 break;
 186                         case GREEN:
 187                                 led->led[i].g = led_bit;
 188                                 break;
 189                         case BLUE:
 190                                 led->led[i].b = led_bit;
 191                                 break;
 192                         default:
 193                                 dev_err(&led->client->dev,
 194                                         "%s: Invalid color\n", __func__);
 195                                 return;
 196                         }
 197                 }
 198         }
 199
 200         if (led_bit == BD2802_BLINK || led_bit == BD2802_ON)
 201                 return;
 202
 203         if (!bd2802_is_led_off(led, id))
 204                 return;
 205
 206         if (bd2802_is_all_off(led) && !led->adf_on) {
 207                 gpio_set_value(led->pdata->reset_gpio, 0);
 208                 return;
 209         }
 210
 211         /*
 212          * In this case, other led is turned on, and current led is turned
 213          * off. So set RGB LED Control register to stop the current RGB LED
 214          */
 215         value = (id == LED1) ? LED_CTL(1, 0) : LED_CTL(0, 1);
 216         bd2802_write_byte(led->client, BD2802_REG_CONTROL, value);
 217 }
 218
 219 static void bd2802_configure(struct bd2802_led *led)
 220 {
 221         struct bd2802_led_platform_data *pdata = led->pdata;
 222         u8 reg;
 223
 224         reg = bd2802_get_reg_addr(LED1, RED, BD2802_REG_HOURSETUP);
 225         bd2802_write_byte(led->client, reg, pdata->rgb_time);
 226
 227         reg = bd2802_get_reg_addr(LED2, RED, BD2802_REG_HOURSETUP);
 228         bd2802_write_byte(led->client, reg, pdata->rgb_time);
 229 }
 230
 231 static void bd2802_reset_cancel(struct bd2802_led *led)
 232 {
 233         gpio_set_value(led->pdata->reset_gpio, 1);
 234         udelay(100);
 235         bd2802_configure(led);
 236 }
 237
 238 static void bd2802_enable(struct bd2802_led *led, enum led_ids id)
 239 {
 240         enum led_ids other_led = (id == LED1) ? LED2 : LED1;
 241         u8 value, other_led_on;
 242
 243         other_led_on = !bd2802_is_led_off(led, other_led);
 244         if (id == LED1)
 245                 value = LED_CTL(other_led_on, 1);
 246         else
 247                 value = LED_CTL(1 , other_led_on);
 248
 249         bd2802_write_byte(led->client, BD2802_REG_CONTROL, value);
 250 }
 251
 252 static void bd2802_set_on(struct bd2802_led *led, enum led_ids id,
 253                                                         enum led_colors color)
 254 {
 255         u8 reg;
 256
 257         if (bd2802_is_all_off(led) && !led->adf_on)
 258                 bd2802_reset_cancel(led);
 259
 260         reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT1SETUP);
 261         bd2802_write_byte(led->client, reg, led->rgb_current);
 262         reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT2SETUP);
 263         bd2802_write_byte(led->client, reg, BD2802_CURRENT_000);
 264         reg = bd2802_get_reg_addr(id, color, BD2802_REG_WAVEPATTERN);
 265         bd2802_write_byte(led->client, reg, BD2802_PATTERN_FULL);
 266
 267         bd2802_enable(led, id);
 268         bd2802_update_state(led, id, color, BD2802_ON);
 269 }
 270
 271 static void bd2802_set_blink(struct bd2802_led *led, enum led_ids id,
 272                                                         enum led_colors color)
 273 {
 274         u8 reg;
 275
 276         if (bd2802_is_all_off(led) && !led->adf_on)
 277                 bd2802_reset_cancel(led);
 278
 279         reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT1SETUP);
 280         bd2802_write_byte(led->client, reg, BD2802_CURRENT_000);
 281         reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT2SETUP);
 282         bd2802_write_byte(led->client, reg, led->rgb_current);
 283         reg = bd2802_get_reg_addr(id, color, BD2802_REG_WAVEPATTERN);
 284         bd2802_write_byte(led->client, reg, led->wave_pattern);
 285
 286         bd2802_enable(led, id);
 287         bd2802_update_state(led, id, color, BD2802_BLINK);
 288 }
 289
 290 static void bd2802_turn_on(struct bd2802_led *led, enum led_ids id,
 291                                 enum led_colors color, enum led_bits led_bit)
 292 {
 293         if (led_bit == BD2802_OFF) {
 294                 dev_err(&led->client->dev,
 295                                         "Only 'blink' and 'on' are allowed\n");
 296                 return;
 297         }
 298
 299         if (led_bit == BD2802_BLINK)
 300                 bd2802_set_blink(led, id, color);
 301         else
 302                 bd2802_set_on(led, id, color);
 303 }
 304
 305 static void bd2802_turn_off(struct bd2802_led *led, enum led_ids id,
 306                                                         enum led_colors color)
 307 {
 308         u8 reg;
 309
 310         if (bd2802_is_rgb_off(led, id, color))
 311                 return;
 312
 313         reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT1SETUP);
 314         bd2802_write_byte(led->client, reg, BD2802_CURRENT_000);
 315         reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT2SETUP);
 316         bd2802_write_byte(led->client, reg, BD2802_CURRENT_000);
 317
 318         bd2802_update_state(led, id, color, BD2802_OFF);
 319 }
 320
 321 #define BD2802_SET_REGISTER(reg_addr, reg_name)                         \
 322 static ssize_t bd2802_store_reg##reg_addr(struct device *dev,           \
 323         struct device_attribute *attr, const char *buf, size_t count)   \
 324 {                                                                       \
 325         struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\
 326         unsigned long val;                                              \
 327         int ret;                                                        \
 328         if (!count)                                                     \
 329                 return -EINVAL;                                         \
 330         ret = kstrtoul(buf, 16, &val);                                  \
 331         if (ret)                                                        \
 332                 return ret;                                             \
 333         down_write(&led->rwsem);                                        \
 334         bd2802_write_byte(led->client, reg_addr, (u8) val);             \
 335         up_write(&led->rwsem);                                          \
 336         return count;                                                   \
 337 }                                                                       \
 338 static struct device_attribute bd2802_reg##reg_addr##_attr = {          \
 339         .attr = {.name = reg_name, .mode = 0644},                       \
 340         .store = bd2802_store_reg##reg_addr,                            \
 341 };
 342
 343 BD2802_SET_REGISTER(0x00, "0x00");
 344 BD2802_SET_REGISTER(0x01, "0x01");
 345 BD2802_SET_REGISTER(0x02, "0x02");
 346 BD2802_SET_REGISTER(0x03, "0x03");
 347 BD2802_SET_REGISTER(0x04, "0x04");
 348 BD2802_SET_REGISTER(0x05, "0x05");
 349 BD2802_SET_REGISTER(0x06, "0x06");
 350 BD2802_SET_REGISTER(0x07, "0x07");
 351 BD2802_SET_REGISTER(0x08, "0x08");
 352 BD2802_SET_REGISTER(0x09, "0x09");
 353 BD2802_SET_REGISTER(0x0a, "0x0a");
 354 BD2802_SET_REGISTER(0x0b, "0x0b");
 355 BD2802_SET_REGISTER(0x0c, "0x0c");
 356 BD2802_SET_REGISTER(0x0d, "0x0d");
 357 BD2802_SET_REGISTER(0x0e, "0x0e");
 358 BD2802_SET_REGISTER(0x0f, "0x0f");
 359 BD2802_SET_REGISTER(0x10, "0x10");
 360 BD2802_SET_REGISTER(0x11, "0x11");
 361 BD2802_SET_REGISTER(0x12, "0x12");
 362 BD2802_SET_REGISTER(0x13, "0x13");
 363 BD2802_SET_REGISTER(0x14, "0x14");
 364 BD2802_SET_REGISTER(0x15, "0x15");
 365
 366 static struct device_attribute *bd2802_addr_attributes[] = {
 367         &bd2802_reg0x00_attr,
 368         &bd2802_reg0x01_attr,
 369         &bd2802_reg0x02_attr,
 370         &bd2802_reg0x03_attr,
 371         &bd2802_reg0x04_attr,
 372         &bd2802_reg0x05_attr,
 373         &bd2802_reg0x06_attr,
 374         &bd2802_reg0x07_attr,
 375         &bd2802_reg0x08_attr,
 376         &bd2802_reg0x09_attr,
 377         &bd2802_reg0x0a_attr,
 378         &bd2802_reg0x0b_attr,
 379         &bd2802_reg0x0c_attr,
 380         &bd2802_reg0x0d_attr,
 381         &bd2802_reg0x0e_attr,
 382         &bd2802_reg0x0f_attr,
 383         &bd2802_reg0x10_attr,
 384         &bd2802_reg0x11_attr,
 385         &bd2802_reg0x12_attr,
 386         &bd2802_reg0x13_attr,
 387         &bd2802_reg0x14_attr,
 388         &bd2802_reg0x15_attr,
 389 };
 390
 391 static void bd2802_enable_adv_conf(struct bd2802_led *led)
 392 {
 393         int i, ret;
 394
 395         for (i = 0; i < ARRAY_SIZE(bd2802_addr_attributes); i++) {
 396                 ret = device_create_file(&led->client->dev,
 397                                                 bd2802_addr_attributes[i]);
 398                 if (ret) {
 399                         dev_err(&led->client->dev, "failed: sysfs file %s\n",
 400                                         bd2802_addr_attributes[i]->attr.name);
 401                         goto failed_remove_files;
 402                 }
 403         }
 404
 405         if (bd2802_is_all_off(led))
 406                 bd2802_reset_cancel(led);
 407
 408         led->adf_on = 1;
 409
 410         return;
 411
 412 failed_remove_files:
 413         for (i--; i >= 0; i--)
 414                 device_remove_file(&led->client->dev,
 415                                                 bd2802_addr_attributes[i]);
 416 }
 417
 418 static void bd2802_disable_adv_conf(struct bd2802_led *led)
 419 {
 420         int i;
 421
 422         for (i = 0; i < ARRAY_SIZE(bd2802_addr_attributes); i++)
 423                 device_remove_file(&led->client->dev,
 424                                                 bd2802_addr_attributes[i]);
 425
 426         if (bd2802_is_all_off(led))
 427                 gpio_set_value(led->pdata->reset_gpio, 0);
 428
 429         led->adf_on = 0;
 430 }
 431
 432 static ssize_t bd2802_show_adv_conf(struct device *dev,
 433         struct device_attribute *attr, char *buf)
 434 {
 435         struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));
 436         ssize_t ret;
 437
 438         down_read(&led->rwsem);
 439         if (led->adf_on)
 440                 ret = sprintf(buf, "on\n");
 441         else
 442                 ret = sprintf(buf, "off\n");
 443         up_read(&led->rwsem);
 444
 445         return ret;
 446 }
 447
 448 static ssize_t bd2802_store_adv_conf(struct device *dev,
 449         struct device_attribute *attr, const char *buf, size_t count)
 450 {
 451         struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));
 452
 453         if (!count)
 454                 return -EINVAL;
 455
 456         down_write(&led->rwsem);
 457         if (!led->adf_on && !strncmp(buf, "on", 2))
 458                 bd2802_enable_adv_conf(led);
 459         else if (led->adf_on && !strncmp(buf, "off", 3))
 460                 bd2802_disable_adv_conf(led);
 461         up_write(&led->rwsem);
 462
 463         return count;
 464 }
 465
 466 static struct device_attribute bd2802_adv_conf_attr = {
 467         .attr = {
 468                 .name = "advanced_configuration",
 469                 .mode = 0644,
 470         },
 471         .show = bd2802_show_adv_conf,
 472         .store = bd2802_store_adv_conf,
 473 };
 474
 475 #define BD2802_CONTROL_ATTR(attr_name, name_str)                        \
 476 static ssize_t bd2802_show_##attr_name(struct device *dev,              \
 477         struct device_attribute *attr, char *buf)                       \
 478 {                                                                       \
 479         struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\
 480         ssize_t ret;                                                    \
 481         down_read(&led->rwsem);                                         \
 482         ret = sprintf(buf, "0x%02x\n", led->attr_name);                 \
 483         up_read(&led->rwsem);                                           \
 484         return ret;                                                     \
 485 }                                                                       \
 486 static ssize_t bd2802_store_##attr_name(struct device *dev,             \
 487         struct device_attribute *attr, const char *buf, size_t count)   \
 488 {                                                                       \
 489         struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\
 490         unsigned long val;                                              \
 491         int ret;                                                        \
 492         if (!count)                                                     \
 493                 return -EINVAL;                                         \
 494         ret = kstrtoul(buf, 16, &val);                                  \
 495         if (ret)                                                        \
 496                 return ret;                                             \
 497         down_write(&led->rwsem);                                        \
 498         led->attr_name = val;                                           \
 499         up_write(&led->rwsem);                                          \
 500         return count;                                                   \
 501 }                                                                       \
 502 static struct device_attribute bd2802_##attr_name##_attr = {            \
 503         .attr = {                                                       \
 504                 .name = name_str,                                       \
 505                 .mode = 0644,                                           \
 506         },                                                              \
 507         .show = bd2802_show_##attr_name,                                \
 508         .store = bd2802_store_##attr_name,                              \
 509 };
 510
 511 BD2802_CONTROL_ATTR(wave_pattern, "wave_pattern");
 512 BD2802_CONTROL_ATTR(rgb_current, "rgb_current");
 513
 514 static struct device_attribute *bd2802_attributes[] = {
 515         &bd2802_adv_conf_attr,
 516         &bd2802_wave_pattern_attr,
 517         &bd2802_rgb_current_attr,
 518 };
 519
 520 #define BD2802_CONTROL_RGBS(name, id, clr)                              \
 521 static int bd2802_set_##name##_brightness(struct led_classdev *led_cdev,\
 522                                         enum led_brightness value)      \
 523 {                                                                       \
 524         struct bd2802_led *led =                                        \
 525                 container_of(led_cdev, struct bd2802_led, cdev_##name); \
 526         led->led_id = id;                                               \
 527         led->color = clr;                                               \
 528         if (value == LED_OFF) {                                         \
 529                 led->state = BD2802_OFF;                                \
 530                 bd2802_turn_off(led, led->led_id, led->color);          \
 531         } else {                                                        \
 532                 led->state = BD2802_ON;                                 \
 533                 bd2802_turn_on(led, led->led_id, led->color, BD2802_ON);\
 534         }                                                               \
 535         return 0;                                                       \
 536 }                                                                       \
 537 static int bd2802_set_##name##_blink(struct led_classdev *led_cdev,     \
 538                 unsigned long *delay_on, unsigned long *delay_off)      \
 539 {                                                                       \
 540         struct bd2802_led *led =                                        \
 541                 container_of(led_cdev, struct bd2802_led, cdev_##name); \
 542         if (*delay_on == 0 || *delay_off == 0)                          \
 543                 return -EINVAL;                                         \
 544         led->led_id = id;                                               \
 545         led->color = clr;                                               \
 546         led->state = BD2802_BLINK;                                      \
 547         bd2802_turn_on(led, led->led_id, led->color, BD2802_BLINK);     \
 548         return 0;                                                       \
 549 }
 550
 551 BD2802_CONTROL_RGBS(led1r, LED1, RED);
 552 BD2802_CONTROL_RGBS(led1g, LED1, GREEN);
 553 BD2802_CONTROL_RGBS(led1b, LED1, BLUE);
 554 BD2802_CONTROL_RGBS(led2r, LED2, RED);
 555 BD2802_CONTROL_RGBS(led2g, LED2, GREEN);
 556 BD2802_CONTROL_RGBS(led2b, LED2, BLUE);
 557
 558 static int bd2802_register_led_classdev(struct bd2802_led *led)
 559 {
 560         int ret;
 561
 562         led->cdev_led1r.name = "led1_R";
 563         led->cdev_led1r.brightness = LED_OFF;
 564         led->cdev_led1r.brightness_set_blocking = bd2802_set_led1r_brightness;
 565         led->cdev_led1r.blink_set = bd2802_set_led1r_blink;
 566
 567         ret = led_classdev_register(&led->client->dev, &led->cdev_led1r);
 568         if (ret < 0) {
 569                 dev_err(&led->client->dev, "couldn't register LED %s\n",
 570                                                         led->cdev_led1r.name);
 571                 goto failed_unregister_led1_R;
 572         }
 573
 574         led->cdev_led1g.name = "led1_G";
 575         led->cdev_led1g.brightness = LED_OFF;
 576         led->cdev_led1g.brightness_set_blocking = bd2802_set_led1g_brightness;
 577         led->cdev_led1g.blink_set = bd2802_set_led1g_blink;
 578
 579         ret = led_classdev_register(&led->client->dev, &led->cdev_led1g);
 580         if (ret < 0) {
 581                 dev_err(&led->client->dev, "couldn't register LED %s\n",
 582                                                         led->cdev_led1g.name);
 583                 goto failed_unregister_led1_G;
 584         }
 585
 586         led->cdev_led1b.name = "led1_B";
 587         led->cdev_led1b.brightness = LED_OFF;
 588         led->cdev_led1b.brightness_set_blocking = bd2802_set_led1b_brightness;
 589         led->cdev_led1b.blink_set = bd2802_set_led1b_blink;
 590
 591         ret = led_classdev_register(&led->client->dev, &led->cdev_led1b);
 592         if (ret < 0) {
 593                 dev_err(&led->client->dev, "couldn't register LED %s\n",
 594                                                         led->cdev_led1b.name);
 595                 goto failed_unregister_led1_B;
 596         }
 597
 598         led->cdev_led2r.name = "led2_R";
 599         led->cdev_led2r.brightness = LED_OFF;
 600         led->cdev_led2r.brightness_set_blocking = bd2802_set_led2r_brightness;
 601         led->cdev_led2r.blink_set = bd2802_set_led2r_blink;
 602
 603         ret = led_classdev_register(&led->client->dev, &led->cdev_led2r);
 604         if (ret < 0) {
 605                 dev_err(&led->client->dev, "couldn't register LED %s\n",
 606                                                         led->cdev_led2r.name);
 607                 goto failed_unregister_led2_R;
 608         }
 609
 610         led->cdev_led2g.name = "led2_G";
 611         led->cdev_led2g.brightness = LED_OFF;
 612         led->cdev_led2g.brightness_set_blocking = bd2802_set_led2g_brightness;
 613         led->cdev_led2g.blink_set = bd2802_set_led2g_blink;
 614
 615         ret = led_classdev_register(&led->client->dev, &led->cdev_led2g);
 616         if (ret < 0) {
 617                 dev_err(&led->client->dev, "couldn't register LED %s\n",
 618                                                         led->cdev_led2g.name);
 619                 goto failed_unregister_led2_G;
 620         }
 621
 622         led->cdev_led2b.name = "led2_B";
 623         led->cdev_led2b.brightness = LED_OFF;
 624         led->cdev_led2b.brightness_set_blocking = bd2802_set_led2b_brightness;
 625         led->cdev_led2b.blink_set = bd2802_set_led2b_blink;
 626         led->cdev_led2b.flags |= LED_CORE_SUSPENDRESUME;
 627
 628         ret = led_classdev_register(&led->client->dev, &led->cdev_led2b);
 629         if (ret < 0) {
 630                 dev_err(&led->client->dev, "couldn't register LED %s\n",
 631                                                         led->cdev_led2b.name);
 632                 goto failed_unregister_led2_B;
 633         }
 634
 635         return 0;
 636
 637 failed_unregister_led2_B:
 638         led_classdev_unregister(&led->cdev_led2g);
 639 failed_unregister_led2_G:
 640         led_classdev_unregister(&led->cdev_led2r);
 641 failed_unregister_led2_R:
 642         led_classdev_unregister(&led->cdev_led1b);
 643 failed_unregister_led1_B:
 644         led_classdev_unregister(&led->cdev_led1g);
 645 failed_unregister_led1_G:
 646         led_classdev_unregister(&led->cdev_led1r);
 647 failed_unregister_led1_R:
 648
 649         return ret;
 650 }
 651
 652 static void bd2802_unregister_led_classdev(struct bd2802_led *led)
 653 {
 654         led_classdev_unregister(&led->cdev_led2b);
 655         led_classdev_unregister(&led->cdev_led2g);
 656         led_classdev_unregister(&led->cdev_led2r);
 657         led_classdev_unregister(&led->cdev_led1b);
 658         led_classdev_unregister(&led->cdev_led1g);
 659         led_classdev_unregister(&led->cdev_led1r);
 660 }
 661
 662 static int bd2802_probe(struct i2c_client *client,
 663                         const struct i2c_device_id *id)
 664 {
 665         struct bd2802_led *led;
 666         struct bd2802_led_platform_data *pdata;
 667         int ret, i;
 668
 669         led = devm_kzalloc(&client->dev, sizeof(struct bd2802_led), GFP_KERNEL);
 670         if (!led)
 671                 return -ENOMEM;
 672
 673         led->client = client;
 674         pdata = led->pdata = dev_get_platdata(&client->dev);
 675         i2c_set_clientdata(client, led);
 676
 677         /* Configure RESET GPIO (L: RESET, H: RESET cancel) */
 678         gpio_request_one(pdata->reset_gpio, GPIOF_OUT_INIT_HIGH, "RGB_RESETB");
 679
 680         /* Tacss = min 0.1ms */
 681         udelay(100);
 682
 683         /* Detect BD2802GU */
 684         ret = bd2802_write_byte(client, BD2802_REG_CLKSETUP, 0x00);
 685         if (ret < 0) {
 686                 dev_err(&client->dev, "failed to detect device\n");
 687                 return ret;
 688         } else
 689                 dev_info(&client->dev, "return 0x%02x\n", ret);
 690
 691         /* To save the power, reset BD2802 after detecting */
 692         gpio_set_value(led->pdata->reset_gpio, 0);
 693
 694         /* Default attributes */
 695         led->wave_pattern = BD2802_PATTERN_HALF;
 696         led->rgb_current = BD2802_CURRENT_032;
 697
 698         init_rwsem(&led->rwsem);
 699
 700         for (i = 0; i < ARRAY_SIZE(bd2802_attributes); i++) {
 701                 ret = device_create_file(&led->client->dev,
 702                                                 bd2802_attributes[i]);
 703                 if (ret) {
 704                         dev_err(&led->client->dev, "failed: sysfs file %s\n",
 705                                         bd2802_attributes[i]->attr.name);
 706                         goto failed_unregister_dev_file;
 707                 }
 708         }
 709
 710         ret = bd2802_register_led_classdev(led);
 711         if (ret < 0)
 712                 goto failed_unregister_dev_file;
 713
 714         return 0;
 715
 716 failed_unregister_dev_file:
 717         for (i--; i >= 0; i--)
 718                 device_remove_file(&led->client->dev, bd2802_attributes[i]);
 719         return ret;
 720 }
 721
 722 static int bd2802_remove(struct i2c_client *client)
 723 {
 724         struct bd2802_led *led = i2c_get_clientdata(client);
 725         int i;
 726
 727         gpio_set_value(led->pdata->reset_gpio, 0);
 728         bd2802_unregister_led_classdev(led);
 729         if (led->adf_on)
 730                 bd2802_disable_adv_conf(led);
 731         for (i = 0; i < ARRAY_SIZE(bd2802_attributes); i++)
 732                 device_remove_file(&led->client->dev, bd2802_attributes[i]);
 733
 734         return 0;
 735 }
 736
 737 #ifdef CONFIG_PM_SLEEP
 738 static void bd2802_restore_state(struct bd2802_led *led)
 739 {
 740         int i;
 741
 742         for (i = 0; i < LED_NUM; i++) {
 743                 if (led->led[i].r)
 744                         bd2802_turn_on(led, i, RED, led->led[i].r);
 745                 if (led->led[i].g)
 746                         bd2802_turn_on(led, i, GREEN, led->led[i].g);
 747                 if (led->led[i].b)
 748                         bd2802_turn_on(led, i, BLUE, led->led[i].b);
 749         }
 750 }
 751
 752 static int bd2802_suspend(struct device *dev)
 753 {
 754         struct i2c_client *client = to_i2c_client(dev);
 755         struct bd2802_led *led = i2c_get_clientdata(client);
 756
 757         gpio_set_value(led->pdata->reset_gpio, 0);
 758
 759         return 0;
 760 }
 761
 762 static int bd2802_resume(struct device *dev)
 763 {
 764         struct i2c_client *client = to_i2c_client(dev);
 765         struct bd2802_led *led = i2c_get_clientdata(client);
 766
 767         if (!bd2802_is_all_off(led) || led->adf_on) {
 768                 bd2802_reset_cancel(led);
 769                 bd2802_restore_state(led);
 770         }
 771
 772         return 0;
 773 }
 774 #endif
 775
 776 static SIMPLE_DEV_PM_OPS(bd2802_pm, bd2802_suspend, bd2802_resume);
 777
 778 static const struct i2c_device_id bd2802_id[] = {
 779         { "BD2802", 0 },
 780         { }
 781 };
 782 MODULE_DEVICE_TABLE(i2c, bd2802_id);
 783
 784 static struct i2c_driver bd2802_i2c_driver = {
 785         .driver = {
 786                 .name   = "BD2802",
 787                 .pm     = &bd2802_pm,
 788         },
 789         .probe          = bd2802_probe,
 790         .remove         = bd2802_remove,
 791         .id_table       = bd2802_id,
 792 };
 793
 794 module_i2c_driver(bd2802_i2c_driver);
 795
 796 MODULE_AUTHOR("Kim Kyuwon <q1.kim@samsung.com>");
 797 MODULE_DESCRIPTION("BD2802 LED driver");
 798 MODULE_LICENSE("GPL v2");