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
  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         struct work_struct              work;
  76
  77         struct led_state                led[2];
  78
  79         /*
  80          * Making led_classdev as array is not recommended, because array
  81          * members prevent using 'container_of' macro. So repetitive works
  82          * are needed.
  83          */
  84         struct led_classdev             cdev_led1r;
  85         struct led_classdev             cdev_led1g;
  86         struct led_classdev             cdev_led1b;
  87         struct led_classdev             cdev_led2r;
  88         struct led_classdev             cdev_led2g;
  89         struct led_classdev             cdev_led2b;
  90
  91         /*
  92          * Advanced Configuration Function(ADF) mode:
  93          * In ADF mode, user can set registers of BD2802GU directly,
  94          * therefore BD2802GU doesn't enter reset state.
  95          */
  96         int                             adf_on;
  97
  98         enum led_ids                    led_id;
  99         enum led_colors                 color;
 100         enum led_bits                   state;
 101
 102         /* General attributes of RGB LEDs */
 103         int                             wave_pattern;
 104         int                             rgb_current;
 105 };
 106
 107
 108 /*--------------------------------------------------------------*/
 109 /*      BD2802GU helper functions                                       */
 110 /*--------------------------------------------------------------*/
 111
 112 static inline int bd2802_is_rgb_off(struct bd2802_led *led, enum led_ids id,
 113                                                         enum led_colors color)
 114 {
 115         switch (color) {
 116         case RED:
 117                 return !led->led[id].r;
 118         case GREEN:
 119                 return !led->led[id].g;
 120         case BLUE:
 121                 return !led->led[id].b;
 122         default:
 123                 dev_err(&led->client->dev, "%s: Invalid color\n", __func__);
 124                 return -EINVAL;
 125         }
 126 }
 127
 128 static inline int bd2802_is_led_off(struct bd2802_led *led, enum led_ids id)
 129 {
 130         if (led->led[id].r || led->led[id].g || led->led[id].b)
 131                 return 0;
 132
 133         return 1;
 134 }
 135
 136 static inline int bd2802_is_all_off(struct bd2802_led *led)
 137 {
 138         int i;
 139
 140         for (i = 0; i < LED_NUM; i++)
 141                 if (!bd2802_is_led_off(led, i))
 142                         return 0;
 143
 144         return 1;
 145 }
 146
 147 static inline u8 bd2802_get_base_offset(enum led_ids id, enum led_colors color)
 148 {
 149         return id * BD2802_LED_OFFSET + color * BD2802_COLOR_OFFSET;
 150 }
 151
 152 static inline u8 bd2802_get_reg_addr(enum led_ids id, enum led_colors color,
 153                                                                 u8 reg_offset)
 154 {
 155         return reg_offset + bd2802_get_base_offset(id, color);
 156 }
 157
 158
 159 /*--------------------------------------------------------------*/
 160 /*      BD2802GU core functions                                 */
 161 /*--------------------------------------------------------------*/
 162
 163 static int bd2802_write_byte(struct i2c_client *client, u8 reg, u8 val)
 164 {
 165         int ret = i2c_smbus_write_byte_data(client, reg, val);
 166         if (ret >= 0)
 167                 return 0;
 168
 169         dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n",
 170                                                 __func__, reg, val, ret);
 171
 172         return ret;
 173 }
 174
 175 static void bd2802_update_state(struct bd2802_led *led, enum led_ids id,
 176                                 enum led_colors color, enum led_bits led_bit)
 177 {
 178         int i;
 179         u8 value;
 180
 181         for (i = 0; i < LED_NUM; i++) {
 182                 if (i == id) {
 183                         switch (color) {
 184                         case RED:
 185                                 led->led[i].r = led_bit;
 186                                 break;
 187                         case GREEN:
 188                                 led->led[i].g = led_bit;
 189                                 break;
 190                         case BLUE:
 191                                 led->led[i].b = led_bit;
 192                                 break;
 193                         default:
 194                                 dev_err(&led->client->dev,
 195                                         "%s: Invalid color\n", __func__);
 196                                 return;
 197                         }
 198                 }
 199         }
 200
 201         if (led_bit == BD2802_BLINK || led_bit == BD2802_ON)
 202                 return;
 203
 204         if (!bd2802_is_led_off(led, id))
 205                 return;
 206
 207         if (bd2802_is_all_off(led) && !led->adf_on) {
 208                 gpio_set_value(led->pdata->reset_gpio, 0);
 209                 return;
 210         }
 211
 212         /*
 213          * In this case, other led is turned on, and current led is turned
 214          * off. So set RGB LED Control register to stop the current RGB LED
 215          */
 216         value = (id == LED1) ? LED_CTL(1, 0) : LED_CTL(0, 1);
 217         bd2802_write_byte(led->client, BD2802_REG_CONTROL, value);
 218 }
 219
 220 static void bd2802_configure(struct bd2802_led *led)
 221 {
 222         struct bd2802_led_platform_data *pdata = led->pdata;
 223         u8 reg;
 224
 225         reg = bd2802_get_reg_addr(LED1, RED, BD2802_REG_HOURSETUP);
 226         bd2802_write_byte(led->client, reg, pdata->rgb_time);
 227
 228         reg = bd2802_get_reg_addr(LED2, RED, BD2802_REG_HOURSETUP);
 229         bd2802_write_byte(led->client, reg, pdata->rgb_time);
 230 }
 231
 232 static void bd2802_reset_cancel(struct bd2802_led *led)
 233 {
 234         gpio_set_value(led->pdata->reset_gpio, 1);
 235         udelay(100);
 236         bd2802_configure(led);
 237 }
 238
 239 static void bd2802_enable(struct bd2802_led *led, enum led_ids id)
 240 {
 241         enum led_ids other_led = (id == LED1) ? LED2 : LED1;
 242         u8 value, other_led_on;
 243
 244         other_led_on = !bd2802_is_led_off(led, other_led);
 245         if (id == LED1)
 246                 value = LED_CTL(other_led_on, 1);
 247         else
 248                 value = LED_CTL(1 , other_led_on);
 249
 250         bd2802_write_byte(led->client, BD2802_REG_CONTROL, value);
 251 }
 252
 253 static void bd2802_set_on(struct bd2802_led *led, enum led_ids id,
 254                                                         enum led_colors color)
 255 {
 256         u8 reg;
 257
 258         if (bd2802_is_all_off(led) && !led->adf_on)
 259                 bd2802_reset_cancel(led);
 260
 261         reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT1SETUP);
 262         bd2802_write_byte(led->client, reg, led->rgb_current);
 263         reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT2SETUP);
 264         bd2802_write_byte(led->client, reg, BD2802_CURRENT_000);
 265         reg = bd2802_get_reg_addr(id, color, BD2802_REG_WAVEPATTERN);
 266         bd2802_write_byte(led->client, reg, BD2802_PATTERN_FULL);
 267
 268         bd2802_enable(led, id);
 269         bd2802_update_state(led, id, color, BD2802_ON);
 270 }
 271
 272 static void bd2802_set_blink(struct bd2802_led *led, enum led_ids id,
 273                                                         enum led_colors color)
 274 {
 275         u8 reg;
 276
 277         if (bd2802_is_all_off(led) && !led->adf_on)
 278                 bd2802_reset_cancel(led);
 279
 280         reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT1SETUP);
 281         bd2802_write_byte(led->client, reg, BD2802_CURRENT_000);
 282         reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT2SETUP);
 283         bd2802_write_byte(led->client, reg, led->rgb_current);
 284         reg = bd2802_get_reg_addr(id, color, BD2802_REG_WAVEPATTERN);
 285         bd2802_write_byte(led->client, reg, led->wave_pattern);
 286
 287         bd2802_enable(led, id);
 288         bd2802_update_state(led, id, color, BD2802_BLINK);
 289 }
 290
 291 static void bd2802_turn_on(struct bd2802_led *led, enum led_ids id,
 292                                 enum led_colors color, enum led_bits led_bit)
 293 {
 294         if (led_bit == BD2802_OFF) {
 295                 dev_err(&led->client->dev,
 296                                         "Only 'blink' and 'on' are allowed\n");
 297                 return;
 298         }
 299
 300         if (led_bit == BD2802_BLINK)
 301                 bd2802_set_blink(led, id, color);
 302         else
 303                 bd2802_set_on(led, id, color);
 304 }
 305
 306 static void bd2802_turn_off(struct bd2802_led *led, enum led_ids id,
 307                                                         enum led_colors color)
 308 {
 309         u8 reg;
 310
 311         if (bd2802_is_rgb_off(led, id, color))
 312                 return;
 313
 314         reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT1SETUP);
 315         bd2802_write_byte(led->client, reg, BD2802_CURRENT_000);
 316         reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT2SETUP);
 317         bd2802_write_byte(led->client, reg, BD2802_CURRENT_000);
 318
 319         bd2802_update_state(led, id, color, BD2802_OFF);
 320 }
 321
 322 static void bd2802_restore_state(struct bd2802_led *led)
 323 {
 324         int i;
 325
 326         for (i = 0; i < LED_NUM; i++) {
 327                 if (led->led[i].r)
 328                         bd2802_turn_on(led, i, RED, led->led[i].r);
 329                 if (led->led[i].g)
 330                         bd2802_turn_on(led, i, GREEN, led->led[i].g);
 331                 if (led->led[i].b)
 332                         bd2802_turn_on(led, i, BLUE, led->led[i].b);
 333         }
 334 }
 335
 336 #define BD2802_SET_REGISTER(reg_addr, reg_name)                         \
 337 static ssize_t bd2802_store_reg##reg_addr(struct device *dev,           \
 338         struct device_attribute *attr, const char *buf, size_t count)   \
 339 {                                                                       \
 340         struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\
 341         unsigned long val;                                              \
 342         int ret;                                                        \
 343         if (!count)                                                     \
 344                 return -EINVAL;                                         \
 345         ret = strict_strtoul(buf, 16, &val);                            \
 346         if (ret)                                                        \
 347                 return ret;                                             \
 348         down_write(&led->rwsem);                                        \
 349         bd2802_write_byte(led->client, reg_addr, (u8) val);             \
 350         up_write(&led->rwsem);                                          \
 351         return count;                                                   \
 352 }                                                                       \
 353 static struct device_attribute bd2802_reg##reg_addr##_attr = {          \
 354         .attr = {.name = reg_name, .mode = 0644},                       \
 355         .store = bd2802_store_reg##reg_addr,                            \
 356 };
 357
 358 BD2802_SET_REGISTER(0x00, "0x00");
 359 BD2802_SET_REGISTER(0x01, "0x01");
 360 BD2802_SET_REGISTER(0x02, "0x02");
 361 BD2802_SET_REGISTER(0x03, "0x03");
 362 BD2802_SET_REGISTER(0x04, "0x04");
 363 BD2802_SET_REGISTER(0x05, "0x05");
 364 BD2802_SET_REGISTER(0x06, "0x06");
 365 BD2802_SET_REGISTER(0x07, "0x07");
 366 BD2802_SET_REGISTER(0x08, "0x08");
 367 BD2802_SET_REGISTER(0x09, "0x09");
 368 BD2802_SET_REGISTER(0x0a, "0x0a");
 369 BD2802_SET_REGISTER(0x0b, "0x0b");
 370 BD2802_SET_REGISTER(0x0c, "0x0c");
 371 BD2802_SET_REGISTER(0x0d, "0x0d");
 372 BD2802_SET_REGISTER(0x0e, "0x0e");
 373 BD2802_SET_REGISTER(0x0f, "0x0f");
 374 BD2802_SET_REGISTER(0x10, "0x10");
 375 BD2802_SET_REGISTER(0x11, "0x11");
 376 BD2802_SET_REGISTER(0x12, "0x12");
 377 BD2802_SET_REGISTER(0x13, "0x13");
 378 BD2802_SET_REGISTER(0x14, "0x14");
 379 BD2802_SET_REGISTER(0x15, "0x15");
 380
 381 static struct device_attribute *bd2802_addr_attributes[] = {
 382         &bd2802_reg0x00_attr,
 383         &bd2802_reg0x01_attr,
 384         &bd2802_reg0x02_attr,
 385         &bd2802_reg0x03_attr,
 386         &bd2802_reg0x04_attr,
 387         &bd2802_reg0x05_attr,
 388         &bd2802_reg0x06_attr,
 389         &bd2802_reg0x07_attr,
 390         &bd2802_reg0x08_attr,
 391         &bd2802_reg0x09_attr,
 392         &bd2802_reg0x0a_attr,
 393         &bd2802_reg0x0b_attr,
 394         &bd2802_reg0x0c_attr,
 395         &bd2802_reg0x0d_attr,
 396         &bd2802_reg0x0e_attr,
 397         &bd2802_reg0x0f_attr,
 398         &bd2802_reg0x10_attr,
 399         &bd2802_reg0x11_attr,
 400         &bd2802_reg0x12_attr,
 401         &bd2802_reg0x13_attr,
 402         &bd2802_reg0x14_attr,
 403         &bd2802_reg0x15_attr,
 404 };
 405
 406 static void bd2802_enable_adv_conf(struct bd2802_led *led)
 407 {
 408         int i, ret;
 409
 410         for (i = 0; i < ARRAY_SIZE(bd2802_addr_attributes); i++) {
 411                 ret = device_create_file(&led->client->dev,
 412                                                 bd2802_addr_attributes[i]);
 413                 if (ret) {
 414                         dev_err(&led->client->dev, "failed: sysfs file %s\n",
 415                                         bd2802_addr_attributes[i]->attr.name);
 416                         goto failed_remove_files;
 417                 }
 418         }
 419
 420         if (bd2802_is_all_off(led))
 421                 bd2802_reset_cancel(led);
 422
 423         led->adf_on = 1;
 424
 425         return;
 426
 427 failed_remove_files:
 428         for (i--; i >= 0; i--)
 429                 device_remove_file(&led->client->dev,
 430                                                 bd2802_addr_attributes[i]);
 431 }
 432
 433 static void bd2802_disable_adv_conf(struct bd2802_led *led)
 434 {
 435         int i;
 436
 437         for (i = 0; i < ARRAY_SIZE(bd2802_addr_attributes); i++)
 438                 device_remove_file(&led->client->dev,
 439                                                 bd2802_addr_attributes[i]);
 440
 441         if (bd2802_is_all_off(led))
 442                 gpio_set_value(led->pdata->reset_gpio, 0);
 443
 444         led->adf_on = 0;
 445 }
 446
 447 static ssize_t bd2802_show_adv_conf(struct device *dev,
 448         struct device_attribute *attr, char *buf)
 449 {
 450         struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));
 451         ssize_t ret;
 452
 453         down_read(&led->rwsem);
 454         if (led->adf_on)
 455                 ret = sprintf(buf, "on\n");
 456         else
 457                 ret = sprintf(buf, "off\n");
 458         up_read(&led->rwsem);
 459
 460         return ret;
 461 }
 462
 463 static ssize_t bd2802_store_adv_conf(struct device *dev,
 464         struct device_attribute *attr, const char *buf, size_t count)
 465 {
 466         struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));
 467
 468         if (!count)
 469                 return -EINVAL;
 470
 471         down_write(&led->rwsem);
 472         if (!led->adf_on && !strncmp(buf, "on", 2))
 473                 bd2802_enable_adv_conf(led);
 474         else if (led->adf_on && !strncmp(buf, "off", 3))
 475                 bd2802_disable_adv_conf(led);
 476         up_write(&led->rwsem);
 477
 478         return count;
 479 }
 480
 481 static struct device_attribute bd2802_adv_conf_attr = {
 482         .attr = {
 483                 .name = "advanced_configuration",
 484                 .mode = 0644,
 485         },
 486         .show = bd2802_show_adv_conf,
 487         .store = bd2802_store_adv_conf,
 488 };
 489
 490 #define BD2802_CONTROL_ATTR(attr_name, name_str)                        \
 491 static ssize_t bd2802_show_##attr_name(struct device *dev,              \
 492         struct device_attribute *attr, char *buf)                       \
 493 {                                                                       \
 494         struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\
 495         ssize_t ret;                                                    \
 496         down_read(&led->rwsem);                                         \
 497         ret = sprintf(buf, "0x%02x\n", led->attr_name);                 \
 498         up_read(&led->rwsem);                                           \
 499         return ret;                                                     \
 500 }                                                                       \
 501 static ssize_t bd2802_store_##attr_name(struct device *dev,             \
 502         struct device_attribute *attr, const char *buf, size_t count)   \
 503 {                                                                       \
 504         struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\
 505         unsigned long val;                                              \
 506         int ret;                                                        \
 507         if (!count)                                                     \
 508                 return -EINVAL;                                         \
 509         ret = strict_strtoul(buf, 16, &val);                            \
 510         if (ret)                                                        \
 511                 return ret;                                             \
 512         down_write(&led->rwsem);                                        \
 513         led->attr_name = val;                                           \
 514         up_write(&led->rwsem);                                          \
 515         return count;                                                   \
 516 }                                                                       \
 517 static struct device_attribute bd2802_##attr_name##_attr = {            \
 518         .attr = {                                                       \
 519                 .name = name_str,                                       \
 520                 .mode = 0644,                                           \
 521         },                                                              \
 522         .show = bd2802_show_##attr_name,                                \
 523         .store = bd2802_store_##attr_name,                              \
 524 };
 525
 526 BD2802_CONTROL_ATTR(wave_pattern, "wave_pattern");
 527 BD2802_CONTROL_ATTR(rgb_current, "rgb_current");
 528
 529 static struct device_attribute *bd2802_attributes[] = {
 530         &bd2802_adv_conf_attr,
 531         &bd2802_wave_pattern_attr,
 532         &bd2802_rgb_current_attr,
 533 };
 534
 535 static void bd2802_led_work(struct work_struct *work)
 536 {
 537         struct bd2802_led *led = container_of(work, struct bd2802_led, work);
 538
 539         if (led->state)
 540                 bd2802_turn_on(led, led->led_id, led->color, led->state);
 541         else
 542                 bd2802_turn_off(led, led->led_id, led->color);
 543 }
 544
 545 #define BD2802_CONTROL_RGBS(name, id, clr)                              \
 546 static void bd2802_set_##name##_brightness(struct led_classdev *led_cdev,\
 547                                         enum led_brightness value)      \
 548 {                                                                       \
 549         struct bd2802_led *led =                                        \
 550                 container_of(led_cdev, struct bd2802_led, cdev_##name); \
 551         led->led_id = id;                                               \
 552         led->color = clr;                                               \
 553         if (value == LED_OFF)                                           \
 554                 led->state = BD2802_OFF;                                \
 555         else                                                            \
 556                 led->state = BD2802_ON;                                 \
 557         schedule_work(&led->work);                                      \
 558 }                                                                       \
 559 static int bd2802_set_##name##_blink(struct led_classdev *led_cdev,     \
 560                 unsigned long *delay_on, unsigned long *delay_off)      \
 561 {                                                                       \
 562         struct bd2802_led *led =                                        \
 563                 container_of(led_cdev, struct bd2802_led, cdev_##name); \
 564         if (*delay_on == 0 || *delay_off == 0)                          \
 565                 return -EINVAL;                                         \
 566         led->led_id = id;                                               \
 567         led->color = clr;                                               \
 568         led->state = BD2802_BLINK;                                      \
 569         schedule_work(&led->work);                                      \
 570         return 0;                                                       \
 571 }
 572
 573 BD2802_CONTROL_RGBS(led1r, LED1, RED);
 574 BD2802_CONTROL_RGBS(led1g, LED1, GREEN);
 575 BD2802_CONTROL_RGBS(led1b, LED1, BLUE);
 576 BD2802_CONTROL_RGBS(led2r, LED2, RED);
 577 BD2802_CONTROL_RGBS(led2g, LED2, GREEN);
 578 BD2802_CONTROL_RGBS(led2b, LED2, BLUE);
 579
 580 static int bd2802_register_led_classdev(struct bd2802_led *led)
 581 {
 582         int ret;
 583
 584         INIT_WORK(&led->work, bd2802_led_work);
 585
 586         led->cdev_led1r.name = "led1_R";
 587         led->cdev_led1r.brightness = LED_OFF;
 588         led->cdev_led1r.brightness_set = bd2802_set_led1r_brightness;
 589         led->cdev_led1r.blink_set = bd2802_set_led1r_blink;
 590
 591         ret = led_classdev_register(&led->client->dev, &led->cdev_led1r);
 592         if (ret < 0) {
 593                 dev_err(&led->client->dev, "couldn't register LED %s\n",
 594                                                         led->cdev_led1r.name);
 595                 goto failed_unregister_led1_R;
 596         }
 597
 598         led->cdev_led1g.name = "led1_G";
 599         led->cdev_led1g.brightness = LED_OFF;
 600         led->cdev_led1g.brightness_set = bd2802_set_led1g_brightness;
 601         led->cdev_led1g.blink_set = bd2802_set_led1g_blink;
 602
 603         ret = led_classdev_register(&led->client->dev, &led->cdev_led1g);
 604         if (ret < 0) {
 605                 dev_err(&led->client->dev, "couldn't register LED %s\n",
 606                                                         led->cdev_led1g.name);
 607                 goto failed_unregister_led1_G;
 608         }
 609
 610         led->cdev_led1b.name = "led1_B";
 611         led->cdev_led1b.brightness = LED_OFF;
 612         led->cdev_led1b.brightness_set = bd2802_set_led1b_brightness;
 613         led->cdev_led1b.blink_set = bd2802_set_led1b_blink;
 614
 615         ret = led_classdev_register(&led->client->dev, &led->cdev_led1b);
 616         if (ret < 0) {
 617                 dev_err(&led->client->dev, "couldn't register LED %s\n",
 618                                                         led->cdev_led1b.name);
 619                 goto failed_unregister_led1_B;
 620         }
 621
 622         led->cdev_led2r.name = "led2_R";
 623         led->cdev_led2r.brightness = LED_OFF;
 624         led->cdev_led2r.brightness_set = bd2802_set_led2r_brightness;
 625         led->cdev_led2r.blink_set = bd2802_set_led2r_blink;
 626
 627         ret = led_classdev_register(&led->client->dev, &led->cdev_led2r);
 628         if (ret < 0) {
 629                 dev_err(&led->client->dev, "couldn't register LED %s\n",
 630                                                         led->cdev_led2r.name);
 631                 goto failed_unregister_led2_R;
 632         }
 633
 634         led->cdev_led2g.name = "led2_G";
 635         led->cdev_led2g.brightness = LED_OFF;
 636         led->cdev_led2g.brightness_set = bd2802_set_led2g_brightness;
 637         led->cdev_led2g.blink_set = bd2802_set_led2g_blink;
 638
 639         ret = led_classdev_register(&led->client->dev, &led->cdev_led2g);
 640         if (ret < 0) {
 641                 dev_err(&led->client->dev, "couldn't register LED %s\n",
 642                                                         led->cdev_led2g.name);
 643                 goto failed_unregister_led2_G;
 644         }
 645
 646         led->cdev_led2b.name = "led2_B";
 647         led->cdev_led2b.brightness = LED_OFF;
 648         led->cdev_led2b.brightness_set = bd2802_set_led2b_brightness;
 649         led->cdev_led2b.blink_set = bd2802_set_led2b_blink;
 650         led->cdev_led2b.flags |= LED_CORE_SUSPENDRESUME;
 651
 652         ret = led_classdev_register(&led->client->dev, &led->cdev_led2b);
 653         if (ret < 0) {
 654                 dev_err(&led->client->dev, "couldn't register LED %s\n",
 655                                                         led->cdev_led2b.name);
 656                 goto failed_unregister_led2_B;
 657         }
 658
 659         return 0;
 660
 661 failed_unregister_led2_B:
 662         led_classdev_unregister(&led->cdev_led2g);
 663 failed_unregister_led2_G:
 664         led_classdev_unregister(&led->cdev_led2r);
 665 failed_unregister_led2_R:
 666         led_classdev_unregister(&led->cdev_led1b);
 667 failed_unregister_led1_B:
 668         led_classdev_unregister(&led->cdev_led1g);
 669 failed_unregister_led1_G:
 670         led_classdev_unregister(&led->cdev_led1r);
 671 failed_unregister_led1_R:
 672
 673         return ret;
 674 }
 675
 676 static void bd2802_unregister_led_classdev(struct bd2802_led *led)
 677 {
 678         cancel_work_sync(&led->work);
 679         led_classdev_unregister(&led->cdev_led1r);
 680 }
 681
 682 static int __devinit bd2802_probe(struct i2c_client *client,
 683                         const struct i2c_device_id *id)
 684 {
 685         struct bd2802_led *led;
 686         struct bd2802_led_platform_data *pdata;
 687         int ret, i;
 688
 689         led = kzalloc(sizeof(struct bd2802_led), GFP_KERNEL);
 690         if (!led) {
 691                 dev_err(&client->dev, "failed to allocate driver data\n");
 692                 return -ENOMEM;
 693         }
 694
 695         led->client = client;
 696         pdata = led->pdata = client->dev.platform_data;
 697         i2c_set_clientdata(client, led);
 698
 699         /* Configure RESET GPIO (L: RESET, H: RESET cancel) */
 700         gpio_request(pdata->reset_gpio, "RGB_RESETB");
 701         gpio_direction_output(pdata->reset_gpio, 1);
 702
 703         /* Tacss = min 0.1ms */
 704         udelay(100);
 705
 706         /* Detect BD2802GU */
 707         ret = bd2802_write_byte(client, BD2802_REG_CLKSETUP, 0x00);
 708         if (ret < 0) {
 709                 dev_err(&client->dev, "failed to detect device\n");
 710                 goto failed_free;
 711         } else
 712                 dev_info(&client->dev, "return 0x%02x\n", ret);
 713
 714         /* To save the power, reset BD2802 after detecting */
 715         gpio_set_value(led->pdata->reset_gpio, 0);
 716
 717         /* Default attributes */
 718         led->wave_pattern = BD2802_PATTERN_HALF;
 719         led->rgb_current = BD2802_CURRENT_032;
 720
 721         init_rwsem(&led->rwsem);
 722
 723         for (i = 0; i < ARRAY_SIZE(bd2802_attributes); i++) {
 724                 ret = device_create_file(&led->client->dev,
 725                                                 bd2802_attributes[i]);
 726                 if (ret) {
 727                         dev_err(&led->client->dev, "failed: sysfs file %s\n",
 728                                         bd2802_attributes[i]->attr.name);
 729                         goto failed_unregister_dev_file;
 730                 }
 731         }
 732
 733         ret = bd2802_register_led_classdev(led);
 734         if (ret < 0)
 735                 goto failed_unregister_dev_file;
 736
 737         return 0;
 738
 739 failed_unregister_dev_file:
 740         for (i--; i >= 0; i--)
 741                 device_remove_file(&led->client->dev, bd2802_attributes[i]);
 742 failed_free:
 743         kfree(led);
 744
 745         return ret;
 746 }
 747
 748 static int __exit bd2802_remove(struct i2c_client *client)
 749 {
 750         struct bd2802_led *led = i2c_get_clientdata(client);
 751         int i;
 752
 753         gpio_set_value(led->pdata->reset_gpio, 0);
 754         bd2802_unregister_led_classdev(led);
 755         if (led->adf_on)
 756                 bd2802_disable_adv_conf(led);
 757         for (i = 0; i < ARRAY_SIZE(bd2802_attributes); i++)
 758                 device_remove_file(&led->client->dev, bd2802_attributes[i]);
 759         kfree(led);
 760
 761         return 0;
 762 }
 763
 764 static int bd2802_suspend(struct i2c_client *client, pm_message_t mesg)
 765 {
 766         struct bd2802_led *led = i2c_get_clientdata(client);
 767
 768         gpio_set_value(led->pdata->reset_gpio, 0);
 769
 770         return 0;
 771 }
 772
 773 static int bd2802_resume(struct i2c_client *client)
 774 {
 775         struct bd2802_led *led = i2c_get_clientdata(client);
 776
 777         if (!bd2802_is_all_off(led) || led->adf_on) {
 778                 bd2802_reset_cancel(led);
 779                 bd2802_restore_state(led);
 780         }
 781
 782         return 0;
 783 }
 784
 785 static const struct i2c_device_id bd2802_id[] = {
 786         { "BD2802", 0 },
 787         { }
 788 };
 789 MODULE_DEVICE_TABLE(i2c, bd2802_id);
 790
 791 static struct i2c_driver bd2802_i2c_driver = {
 792         .driver = {
 793                 .name   = "BD2802",
 794         },
 795         .probe          = bd2802_probe,
 796         .remove         = __exit_p(bd2802_remove),
 797         .suspend        = bd2802_suspend,
 798         .resume         = bd2802_resume,
 799         .id_table       = bd2802_id,
 800 };
 801
 802 static int __init bd2802_init(void)
 803 {
 804         return i2c_add_driver(&bd2802_i2c_driver);
 805 }
 806 module_init(bd2802_init);
 807
 808 static void __exit bd2802_exit(void)
 809 {
 810         i2c_del_driver(&bd2802_i2c_driver);
 811 }
 812 module_exit(bd2802_exit);
 813
 814 MODULE_AUTHOR("Kim Kyuwon <q1.kim@samsung.com>");
 815 MODULE_DESCRIPTION("BD2802 LED driver");
 816 MODULE_LICENSE("GPL v2");