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
  22
  23 #define LED_CTL(rgb2en, rgb1en) ((rgb2en) << 4 | ((rgb1en) << 0))
  24
  25 #define BD2802_LED_OFFSET               0xa
  26 #define BD2802_COLOR_OFFSET             0x3
  27
  28 #define BD2802_REG_CLKSETUP             0x00
  29 #define BD2802_REG_CONTROL              0x01
  30 #define BD2802_REG_HOURSETUP            0x02
  31 #define BD2802_REG_CURRENT1SETUP        0x03
  32 #define BD2802_REG_CURRENT2SETUP        0x04
  33 #define BD2802_REG_WAVEPATTERN          0x05
  34
  35 #define BD2802_CURRENT_032              0x10 /* 3.2mA */
  36 #define BD2802_CURRENT_000              0x00 /* 0.0mA */
  37
  38 #define BD2802_PATTERN_FULL             0x07
  39 #define BD2802_PATTERN_HALF             0x03
  40
  41 enum led_ids {
  42         LED1,
  43         LED2,
  44         LED_NUM,
  45 };
  46
  47 enum led_colors {
  48         RED,
  49         GREEN,
  50         BLUE,
  51 };
  52
  53 enum led_bits {
  54         BD2802_OFF,
  55         BD2802_BLINK,
  56         BD2802_ON,
  57 };
  58
  59 /*
  60  * State '0' : 'off'
  61  * State '1' : 'blink'
  62  * State '2' : 'on'.
  63  */
  64 struct led_state {
  65         unsigned r:2;
  66         unsigned g:2;
  67         unsigned b:2;
  68 };
  69
  70 struct bd2802_led {
  71         struct bd2802_led_platform_data *pdata;
  72         struct i2c_client               *client;
  73         struct rw_semaphore             rwsem;
  74         struct work_struct              work;
  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
 102
 103 /*--------------------------------------------------------------*/
 104 /*      BD2802GU helper functions                                       */
 105 /*--------------------------------------------------------------*/
 106
 107 static inline int bd2802_is_rgb_off(struct bd2802_led *led, enum led_ids id,
 108                                                         enum led_colors color)
 109 {
 110         switch (color) {
 111         case RED:
 112                 return !led->led[id].r;
 113         case GREEN:
 114                 return !led->led[id].g;
 115         case BLUE:
 116                 return !led->led[id].b;
 117         default:
 118                 dev_err(&led->client->dev, "%s: Invalid color\n", __func__);
 119                 return -EINVAL;
 120         }
 121 }
 122
 123 static inline int bd2802_is_led_off(struct bd2802_led *led, enum led_ids id)
 124 {
 125         if (led->led[id].r || led->led[id].g || led->led[id].b)
 126                 return 0;
 127
 128         return 1;
 129 }
 130
 131 static inline int bd2802_is_all_off(struct bd2802_led *led)
 132 {
 133         int i;
 134
 135         for (i = 0; i < LED_NUM; i++)
 136                 if (!bd2802_is_led_off(led, i))
 137                         return 0;
 138
 139         return 1;
 140 }
 141
 142 static inline u8 bd2802_get_base_offset(enum led_ids id, enum led_colors color)
 143 {
 144         return id * BD2802_LED_OFFSET + color * BD2802_COLOR_OFFSET;
 145 }
 146
 147 static inline u8 bd2802_get_reg_addr(enum led_ids id, enum led_colors color,
 148                                                                 u8 reg_offset)
 149 {
 150         return reg_offset + bd2802_get_base_offset(id, color);
 151 }
 152
 153
 154 /*--------------------------------------------------------------*/
 155 /*      BD2802GU core functions                                 */
 156 /*--------------------------------------------------------------*/
 157
 158 static int bd2802_write_byte(struct i2c_client *client, u8 reg, u8 val)
 159 {
 160         int ret = i2c_smbus_write_byte_data(client, reg, val);
 161         if (ret >= 0)
 162                 return 0;
 163
 164         dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n",
 165                                                 __func__, reg, val, ret);
 166
 167         return ret;
 168 }
 169
 170 static void bd2802_update_state(struct bd2802_led *led, enum led_ids id,
 171                                 enum led_colors color, enum led_bits led_bit)
 172 {
 173         int i;
 174         u8 value;
 175
 176         for (i = 0; i < LED_NUM; i++) {
 177                 if (i == id) {
 178                         switch (color) {
 179                         case RED:
 180                                 led->led[i].r = led_bit;
 181                                 break;
 182                         case GREEN:
 183                                 led->led[i].g = led_bit;
 184                                 break;
 185                         case BLUE:
 186                                 led->led[i].b = led_bit;
 187                                 break;
 188                         default:
 189                                 dev_err(&led->client->dev,
 190                                         "%s: Invalid color\n", __func__);
 191                                 return;
 192                         }
 193                 }
 194         }
 195
 196         if (led_bit == BD2802_BLINK || led_bit == BD2802_ON)
 197                 return;
 198
 199         if (!bd2802_is_led_off(led, id))
 200                 return;
 201
 202         if (bd2802_is_all_off(led) && !led->adf_on) {
 203                 gpio_set_value(led->pdata->reset_gpio, 0);
 204                 return;
 205         }
 206
 207         /*
 208          * In this case, other led is turned on, and current led is turned
 209          * off. So set RGB LED Control register to stop the current RGB LED
 210          */
 211         value = (id == LED1) ? LED_CTL(1, 0) : LED_CTL(0, 1);
 212         bd2802_write_byte(led->client, BD2802_REG_CONTROL, value);
 213 }
 214
 215 static void bd2802_configure(struct bd2802_led *led)
 216 {
 217         struct bd2802_led_platform_data *pdata = led->pdata;
 218         u8 reg;
 219
 220         reg = bd2802_get_reg_addr(LED1, RED, BD2802_REG_HOURSETUP);
 221         bd2802_write_byte(led->client, reg, pdata->rgb_time);
 222
 223         reg = bd2802_get_reg_addr(LED2, RED, BD2802_REG_HOURSETUP);
 224         bd2802_write_byte(led->client, reg, pdata->rgb_time);
 225 }
 226
 227 static void bd2802_reset_cancel(struct bd2802_led *led)
 228 {
 229         gpio_set_value(led->pdata->reset_gpio, 1);
 230         udelay(100);
 231         bd2802_configure(led);
 232 }
 233
 234 static void bd2802_enable(struct bd2802_led *led, enum led_ids id)
 235 {
 236         enum led_ids other_led = (id == LED1) ? LED2 : LED1;
 237         u8 value, other_led_on;
 238
 239         other_led_on = !bd2802_is_led_off(led, other_led);
 240         if (id == LED1)
 241                 value = LED_CTL(other_led_on, 1);
 242         else
 243                 value = LED_CTL(1 , other_led_on);
 244
 245         bd2802_write_byte(led->client, BD2802_REG_CONTROL, value);
 246 }
 247
 248 static void bd2802_set_on(struct bd2802_led *led, enum led_ids id,
 249                                                         enum led_colors color)
 250 {
 251         u8 reg;
 252
 253         if (bd2802_is_all_off(led) && !led->adf_on)
 254                 bd2802_reset_cancel(led);
 255
 256         reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT1SETUP);
 257         bd2802_write_byte(led->client, reg, BD2802_CURRENT_032);
 258         reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT2SETUP);
 259         bd2802_write_byte(led->client, reg, BD2802_CURRENT_000);
 260         reg = bd2802_get_reg_addr(id, color, BD2802_REG_WAVEPATTERN);
 261         bd2802_write_byte(led->client, reg, BD2802_PATTERN_FULL);
 262
 263         bd2802_enable(led, id);
 264         bd2802_update_state(led, id, color, BD2802_ON);
 265 }
 266
 267 static void bd2802_set_blink(struct bd2802_led *led, enum led_ids id,
 268                                                         enum led_colors color)
 269 {
 270         u8 reg;
 271
 272         if (bd2802_is_all_off(led) && !led->adf_on)
 273                 bd2802_reset_cancel(led);
 274
 275         reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT1SETUP);
 276         bd2802_write_byte(led->client, reg, BD2802_CURRENT_000);
 277         reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT2SETUP);
 278         bd2802_write_byte(led->client, reg, BD2802_CURRENT_032);
 279         reg = bd2802_get_reg_addr(id, color, BD2802_REG_WAVEPATTERN);
 280         bd2802_write_byte(led->client, reg, BD2802_PATTERN_HALF);
 281
 282         bd2802_enable(led, id);
 283         bd2802_update_state(led, id, color, BD2802_BLINK);
 284 }
 285
 286 static void bd2802_turn_on(struct bd2802_led *led, enum led_ids id,
 287                                 enum led_colors color, enum led_bits led_bit)
 288 {
 289         if (led_bit == BD2802_OFF) {
 290                 dev_err(&led->client->dev,
 291                                         "Only 'blink' and 'on' are allowed\n");
 292                 return;
 293         }
 294
 295         if (led_bit == BD2802_BLINK)
 296                 bd2802_set_blink(led, id, color);
 297         else
 298                 bd2802_set_on(led, id, color);
 299 }
 300
 301 static void bd2802_turn_off(struct bd2802_led *led, enum led_ids id,
 302                                                         enum led_colors color)
 303 {
 304         u8 reg;
 305
 306         if (bd2802_is_rgb_off(led, id, color))
 307                 return;
 308
 309         reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT1SETUP);
 310         bd2802_write_byte(led->client, reg, BD2802_CURRENT_000);
 311         reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT2SETUP);
 312         bd2802_write_byte(led->client, reg, BD2802_CURRENT_000);
 313
 314         bd2802_update_state(led, id, color, BD2802_OFF);
 315 }
 316
 317 static void bd2802_restore_state(struct bd2802_led *led)
 318 {
 319         int i;
 320
 321         for (i = 0; i < LED_NUM; i++) {
 322                 if (led->led[i].r)
 323                         bd2802_turn_on(led, i, RED, led->led[i].r);
 324                 if (led->led[i].g)
 325                         bd2802_turn_on(led, i, GREEN, led->led[i].g);
 326                 if (led->led[i].b)
 327                         bd2802_turn_on(led, i, BLUE, led->led[i].b);
 328         }
 329 }
 330
 331 #define BD2802_SET_REGISTER(reg_addr, reg_name)                         \
 332 static ssize_t bd2802_store_reg##reg_addr(struct device *dev,           \
 333         struct device_attribute *attr, const char *buf, size_t count)   \
 334 {                                                                       \
 335         struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\
 336         unsigned long val;                                              \
 337         int ret;                                                        \
 338         if (!count)                                                     \
 339                 return -EINVAL;                                         \
 340         ret = strict_strtoul(buf, 16, &val);                            \
 341         if (ret)                                                        \
 342                 return ret;                                             \
 343         down_write(&led->rwsem);                                        \
 344         bd2802_write_byte(led->client, reg_addr, (u8) val);             \
 345         up_write(&led->rwsem);                                          \
 346         return count;                                                   \
 347 }                                                                       \
 348 static struct device_attribute bd2802_reg##reg_addr##_attr = {          \
 349         .attr = {.name = reg_name, .mode = 0644, .owner = THIS_MODULE}, \
 350         .store = bd2802_store_reg##reg_addr,                            \
 351 };
 352
 353 BD2802_SET_REGISTER(0x00, "0x00");
 354 BD2802_SET_REGISTER(0x01, "0x01");
 355 BD2802_SET_REGISTER(0x02, "0x02");
 356 BD2802_SET_REGISTER(0x03, "0x03");
 357 BD2802_SET_REGISTER(0x04, "0x04");
 358 BD2802_SET_REGISTER(0x05, "0x05");
 359 BD2802_SET_REGISTER(0x06, "0x06");
 360 BD2802_SET_REGISTER(0x07, "0x07");
 361 BD2802_SET_REGISTER(0x08, "0x08");
 362 BD2802_SET_REGISTER(0x09, "0x09");
 363 BD2802_SET_REGISTER(0x0a, "0x0a");
 364 BD2802_SET_REGISTER(0x0b, "0x0b");
 365 BD2802_SET_REGISTER(0x0c, "0x0c");
 366 BD2802_SET_REGISTER(0x0d, "0x0d");
 367 BD2802_SET_REGISTER(0x0e, "0x0e");
 368 BD2802_SET_REGISTER(0x0f, "0x0f");
 369 BD2802_SET_REGISTER(0x10, "0x10");
 370 BD2802_SET_REGISTER(0x11, "0x11");
 371 BD2802_SET_REGISTER(0x12, "0x12");
 372 BD2802_SET_REGISTER(0x13, "0x13");
 373 BD2802_SET_REGISTER(0x14, "0x14");
 374 BD2802_SET_REGISTER(0x15, "0x15");
 375
 376 static struct device_attribute *bd2802_addr_attributes[] = {
 377         &bd2802_reg0x00_attr,
 378         &bd2802_reg0x01_attr,
 379         &bd2802_reg0x02_attr,
 380         &bd2802_reg0x03_attr,
 381         &bd2802_reg0x04_attr,
 382         &bd2802_reg0x05_attr,
 383         &bd2802_reg0x06_attr,
 384         &bd2802_reg0x07_attr,
 385         &bd2802_reg0x08_attr,
 386         &bd2802_reg0x09_attr,
 387         &bd2802_reg0x0a_attr,
 388         &bd2802_reg0x0b_attr,
 389         &bd2802_reg0x0c_attr,
 390         &bd2802_reg0x0d_attr,
 391         &bd2802_reg0x0e_attr,
 392         &bd2802_reg0x0f_attr,
 393         &bd2802_reg0x10_attr,
 394         &bd2802_reg0x11_attr,
 395         &bd2802_reg0x12_attr,
 396         &bd2802_reg0x13_attr,
 397         &bd2802_reg0x14_attr,
 398         &bd2802_reg0x15_attr,
 399 };
 400
 401 static void bd2802_enable_adv_conf(struct bd2802_led *led)
 402 {
 403         int i, ret;
 404
 405         for (i = 0; i < ARRAY_SIZE(bd2802_addr_attributes); i++) {
 406                 ret = device_create_file(&led->client->dev,
 407                                                 bd2802_addr_attributes[i]);
 408                 if (ret) {
 409                         dev_err(&led->client->dev, "failed to sysfs file %s\n",
 410                                         bd2802_addr_attributes[i]->attr.name);
 411                         goto failed_remove_files;
 412                 }
 413         }
 414
 415         if (bd2802_is_all_off(led))
 416                 bd2802_reset_cancel(led);
 417
 418         led->adf_on = 1;
 419
 420         return;
 421
 422 failed_remove_files:
 423         for (i--; i >= 0; i--)
 424                 device_remove_file(&led->client->dev,
 425                                                 bd2802_addr_attributes[i]);
 426 }
 427
 428 static void bd2802_disable_adv_conf(struct bd2802_led *led)
 429 {
 430         int i;
 431
 432         for (i = 0; i < ARRAY_SIZE(bd2802_addr_attributes); i++)
 433                 device_remove_file(&led->client->dev,
 434                                                 bd2802_addr_attributes[i]);
 435
 436         if (bd2802_is_all_off(led))
 437                 gpio_set_value(led->pdata->reset_gpio, 0);
 438
 439         led->adf_on = 0;
 440 }
 441
 442 static ssize_t bd2802_show_adv_conf(struct device *dev,
 443         struct device_attribute *attr, char *buf)
 444 {
 445         struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));
 446         ssize_t ret;
 447
 448         down_read(&led->rwsem);
 449         if (led->adf_on)
 450                 ret = sprintf(buf, "on\n");
 451         else
 452                 ret = sprintf(buf, "off\n");
 453         up_read(&led->rwsem);
 454
 455         return ret;
 456 }
 457
 458 static ssize_t bd2802_store_adv_conf(struct device *dev,
 459         struct device_attribute *attr, const char *buf, size_t count)
 460 {
 461         struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));
 462
 463         if (!count)
 464                 return -EINVAL;
 465
 466         down_write(&led->rwsem);
 467         if (!led->adf_on && !strncmp(buf, "on", 2))
 468                 bd2802_enable_adv_conf(led);
 469         else if (led->adf_on && !strncmp(buf, "off", 3))
 470                 bd2802_disable_adv_conf(led);
 471         up_write(&led->rwsem);
 472
 473         return count;
 474 }
 475
 476 static struct device_attribute bd2802_adv_conf_attr = {
 477         .attr = {
 478                 .name = "advanced_configuration",
 479                 .mode = 0644,
 480                 .owner = THIS_MODULE
 481         },
 482         .show = bd2802_show_adv_conf,
 483         .store = bd2802_store_adv_conf,
 484 };
 485
 486 static void bd2802_led_work(struct work_struct *work)
 487 {
 488         struct bd2802_led *led = container_of(work, struct bd2802_led, work);
 489
 490         if (led->state)
 491                 bd2802_turn_on(led, led->led_id, led->color, led->state);
 492         else
 493                 bd2802_turn_off(led, led->led_id, led->color);
 494 }
 495
 496 #define BD2802_CONTROL_RGBS(name, id, clr)                              \
 497 static void bd2802_set_##name##_brightness(struct led_classdev *led_cdev,\
 498                                         enum led_brightness value)      \
 499 {                                                                       \
 500         struct bd2802_led *led =                                        \
 501                 container_of(led_cdev, struct bd2802_led, cdev_##name); \
 502         led->led_id = id;                                               \
 503         led->color = clr;                                               \
 504         if (value == LED_OFF)                                           \
 505                 led->state = BD2802_OFF;                                \
 506         else                                                            \
 507                 led->state = BD2802_ON;                                 \
 508         schedule_work(&led->work);                                      \
 509 }                                                                       \
 510 static int bd2802_set_##name##_blink(struct led_classdev *led_cdev,     \
 511                 unsigned long *delay_on, unsigned long *delay_off)      \
 512 {                                                                       \
 513         struct bd2802_led *led =                                        \
 514                 container_of(led_cdev, struct bd2802_led, cdev_##name); \
 515         if (*delay_on == 0 || *delay_off == 0)                          \
 516                 return -EINVAL;                                         \
 517         led->led_id = id;                                               \
 518         led->color = clr;                                               \
 519         led->state = BD2802_BLINK;                                      \
 520         schedule_work(&led->work);                                      \
 521         return 0;                                                       \
 522 }
 523
 524 BD2802_CONTROL_RGBS(led1r, LED1, RED);
 525 BD2802_CONTROL_RGBS(led1g, LED1, GREEN);
 526 BD2802_CONTROL_RGBS(led1b, LED1, BLUE);
 527 BD2802_CONTROL_RGBS(led2r, LED2, RED);
 528 BD2802_CONTROL_RGBS(led2g, LED2, GREEN);
 529 BD2802_CONTROL_RGBS(led2b, LED2, BLUE);
 530
 531 static int bd2802_register_led_classdev(struct bd2802_led *led)
 532 {
 533         int ret;
 534
 535         INIT_WORK(&led->work, bd2802_led_work);
 536
 537         led->cdev_led1r.name = "led1_R";
 538         led->cdev_led1r.brightness = LED_OFF;
 539         led->cdev_led1r.brightness_set = bd2802_set_led1r_brightness;
 540         led->cdev_led1r.blink_set = bd2802_set_led1r_blink;
 541         led->cdev_led1r.flags |= LED_CORE_SUSPENDRESUME;
 542
 543         ret = led_classdev_register(&led->client->dev, &led->cdev_led1r);
 544         if (ret < 0) {
 545                 dev_err(&led->client->dev, "couldn't register LED %s\n",
 546                                                         led->cdev_led1r.name);
 547                 goto failed_unregister_led1_R;
 548         }
 549
 550         led->cdev_led1g.name = "led1_G";
 551         led->cdev_led1g.brightness = LED_OFF;
 552         led->cdev_led1g.brightness_set = bd2802_set_led1g_brightness;
 553         led->cdev_led1g.blink_set = bd2802_set_led1g_blink;
 554         led->cdev_led1g.flags |= LED_CORE_SUSPENDRESUME;
 555
 556         ret = led_classdev_register(&led->client->dev, &led->cdev_led1g);
 557         if (ret < 0) {
 558                 dev_err(&led->client->dev, "couldn't register LED %s\n",
 559                                                         led->cdev_led1g.name);
 560                 goto failed_unregister_led1_G;
 561         }
 562
 563         led->cdev_led1b.name = "led1_B";
 564         led->cdev_led1b.brightness = LED_OFF;
 565         led->cdev_led1b.brightness_set = bd2802_set_led1b_brightness;
 566         led->cdev_led1b.blink_set = bd2802_set_led1b_blink;
 567         led->cdev_led1b.flags |= LED_CORE_SUSPENDRESUME;
 568
 569         ret = led_classdev_register(&led->client->dev, &led->cdev_led1b);
 570         if (ret < 0) {
 571                 dev_err(&led->client->dev, "couldn't register LED %s\n",
 572                                                         led->cdev_led1b.name);
 573                 goto failed_unregister_led1_B;
 574         }
 575
 576         led->cdev_led2r.name = "led2_R";
 577         led->cdev_led2r.brightness = LED_OFF;
 578         led->cdev_led2r.brightness_set = bd2802_set_led2r_brightness;
 579         led->cdev_led2r.blink_set = bd2802_set_led2r_blink;
 580         led->cdev_led2r.flags |= LED_CORE_SUSPENDRESUME;
 581
 582         ret = led_classdev_register(&led->client->dev, &led->cdev_led2r);
 583         if (ret < 0) {
 584                 dev_err(&led->client->dev, "couldn't register LED %s\n",
 585                                                         led->cdev_led2r.name);
 586                 goto failed_unregister_led2_R;
 587         }
 588
 589         led->cdev_led2g.name = "led2_G";
 590         led->cdev_led2g.brightness = LED_OFF;
 591         led->cdev_led2g.brightness_set = bd2802_set_led2g_brightness;
 592         led->cdev_led2g.blink_set = bd2802_set_led2g_blink;
 593         led->cdev_led2g.flags |= LED_CORE_SUSPENDRESUME;
 594
 595         ret = led_classdev_register(&led->client->dev, &led->cdev_led2g);
 596         if (ret < 0) {
 597                 dev_err(&led->client->dev, "couldn't register LED %s\n",
 598                                                         led->cdev_led2g.name);
 599                 goto failed_unregister_led2_G;
 600         }
 601
 602         led->cdev_led2b.name = "led2_B";
 603         led->cdev_led2b.brightness = LED_OFF;
 604         led->cdev_led2b.brightness_set = bd2802_set_led2b_brightness;
 605         led->cdev_led2b.blink_set = bd2802_set_led2b_blink;
 606         led->cdev_led2b.flags |= LED_CORE_SUSPENDRESUME;
 607
 608         ret = led_classdev_register(&led->client->dev, &led->cdev_led2b);
 609         if (ret < 0) {
 610                 dev_err(&led->client->dev, "couldn't register LED %s\n",
 611                                                         led->cdev_led2b.name);
 612                 goto failed_unregister_led2_B;
 613         }
 614
 615         return 0;
 616
 617 failed_unregister_led2_B:
 618         led_classdev_unregister(&led->cdev_led2g);
 619 failed_unregister_led2_G:
 620         led_classdev_unregister(&led->cdev_led2r);
 621 failed_unregister_led2_R:
 622         led_classdev_unregister(&led->cdev_led1b);
 623 failed_unregister_led1_B:
 624         led_classdev_unregister(&led->cdev_led1g);
 625 failed_unregister_led1_G:
 626         led_classdev_unregister(&led->cdev_led1r);
 627 failed_unregister_led1_R:
 628
 629         return ret;
 630 }
 631
 632 static void bd2802_unregister_led_classdev(struct bd2802_led *led)
 633 {
 634         cancel_work_sync(&led->work);
 635         led_classdev_unregister(&led->cdev_led1r);
 636 }
 637
 638 static int __devinit bd2802_probe(struct i2c_client *client,
 639                         const struct i2c_device_id *id)
 640 {
 641         struct bd2802_led *led;
 642         struct bd2802_led_platform_data *pdata;
 643         int ret;
 644
 645         led = kzalloc(sizeof(struct bd2802_led), GFP_KERNEL);
 646         if (!led) {
 647                 dev_err(&client->dev, "failed to allocate driver data\n");
 648                 return -ENOMEM;
 649         }
 650
 651         led->client = client;
 652         pdata = led->pdata = client->dev.platform_data;
 653         i2c_set_clientdata(client, led);
 654
 655         /* Configure RESET GPIO (L: RESET, H: RESET cancel) */
 656         gpio_request(pdata->reset_gpio, "RGB_RESETB");
 657         gpio_direction_output(pdata->reset_gpio, 1);
 658
 659         /* Tacss = min 0.1ms */
 660         udelay(100);
 661
 662         /* Detect BD2802GU */
 663         ret = bd2802_write_byte(client, BD2802_REG_CLKSETUP, 0x00);
 664         if (ret < 0) {
 665                 dev_err(&client->dev, "failed to detect device\n");
 666                 goto failed_free;
 667         } else
 668                 dev_info(&client->dev, "return 0x%02x\n", ret);
 669
 670         /* To save the power, reset BD2802 after detecting */
 671         gpio_set_value(led->pdata->reset_gpio, 0);
 672
 673         init_rwsem(&led->rwsem);
 674
 675         ret = device_create_file(&client->dev, &bd2802_adv_conf_attr);
 676         if (ret) {
 677                 dev_err(&client->dev, "failed to create sysfs file %s\n",
 678                                         bd2802_adv_conf_attr.attr.name);
 679                 goto failed_free;
 680         }
 681
 682         ret = bd2802_register_led_classdev(led);
 683         if (ret < 0)
 684                 goto failed_unregister_dev_file;
 685
 686         return 0;
 687
 688 failed_unregister_dev_file:
 689         device_remove_file(&client->dev, &bd2802_adv_conf_attr);
 690 failed_free:
 691         i2c_set_clientdata(client, NULL);
 692         kfree(led);
 693
 694         return ret;
 695 }
 696
 697 static int __exit bd2802_remove(struct i2c_client *client)
 698 {
 699         struct bd2802_led *led = i2c_get_clientdata(client);
 700
 701         bd2802_unregister_led_classdev(led);
 702         gpio_set_value(led->pdata->reset_gpio, 0);
 703         if (led->adf_on)
 704                 bd2802_disable_adv_conf(led);
 705         device_remove_file(&client->dev, &bd2802_adv_conf_attr);
 706         i2c_set_clientdata(client, NULL);
 707         kfree(led);
 708
 709         return 0;
 710 }
 711
 712 static int bd2802_suspend(struct i2c_client *client, pm_message_t mesg)
 713 {
 714         struct bd2802_led *led = i2c_get_clientdata(client);
 715
 716         gpio_set_value(led->pdata->reset_gpio, 0);
 717
 718         return 0;
 719 }
 720
 721 static int bd2802_resume(struct i2c_client *client)
 722 {
 723         struct bd2802_led *led = i2c_get_clientdata(client);
 724
 725         if (!bd2802_is_all_off(led) || led->adf_on) {
 726                 gpio_set_value(led->pdata->reset_gpio, 1);
 727                 udelay(100);
 728                 bd2802_restore_state(led);
 729         }
 730
 731         return 0;
 732 }
 733
 734 static const struct i2c_device_id bd2802_id[] = {
 735         { "BD2802", 0 },
 736         { }
 737 };
 738 MODULE_DEVICE_TABLE(i2c, bd2802_id);
 739
 740 static struct i2c_driver bd2802_i2c_driver = {
 741         .driver = {
 742                 .name   = "BD2802",
 743         },
 744         .probe          = bd2802_probe,
 745         .remove         = __exit_p(bd2802_remove),
 746         .suspend        = bd2802_suspend,
 747         .resume         = bd2802_resume,
 748         .id_table       = bd2802_id,
 749 };
 750
 751 static int __init bd2802_init(void)
 752 {
 753         return i2c_add_driver(&bd2802_i2c_driver);
 754 }
 755 module_init(bd2802_init);
 756
 757 static void __exit bd2802_exit(void)
 758 {
 759         i2c_del_driver(&bd2802_i2c_driver);
 760 }
 761 module_exit(bd2802_exit);
 762
 763 MODULE_AUTHOR("Kim Kyuwon <q1.kim@samsung.com>");
 764 MODULE_DESCRIPTION("BD2802 LED driver");
 765 MODULE_LICENSE("GPL");