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         /* 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 static void bd2802_restore_state(struct bd2802_led *led)
 322 {
 323         int i;
 324
 325         for (i = 0; i < LED_NUM; i++) {
 326                 if (led->led[i].r)
 327                         bd2802_turn_on(led, i, RED, led->led[i].r);
 328                 if (led->led[i].g)
 329                         bd2802_turn_on(led, i, GREEN, led->led[i].g);
 330                 if (led->led[i].b)
 331                         bd2802_turn_on(led, i, BLUE, led->led[i].b);
 332         }
 333 }
 334
 335 #define BD2802_SET_REGISTER(reg_addr, reg_name)                         \
 336 static ssize_t bd2802_store_reg##reg_addr(struct device *dev,           \
 337         struct device_attribute *attr, const char *buf, size_t count)   \
 338 {                                                                       \
 339         struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\
 340         unsigned long val;                                              \
 341         int ret;                                                        \
 342         if (!count)                                                     \
 343                 return -EINVAL;                                         \
 344         ret = strict_strtoul(buf, 16, &val);                            \
 345         if (ret)                                                        \
 346                 return ret;                                             \
 347         down_write(&led->rwsem);                                        \
 348         bd2802_write_byte(led->client, reg_addr, (u8) val);             \
 349         up_write(&led->rwsem);                                          \
 350         return count;                                                   \
 351 }                                                                       \
 352 static struct device_attribute bd2802_reg##reg_addr##_attr = {          \
 353         .attr = {.name = reg_name, .mode = 0644, .owner = THIS_MODULE}, \
 354         .store = bd2802_store_reg##reg_addr,                            \
 355 };
 356
 357 BD2802_SET_REGISTER(0x00, "0x00");
 358 BD2802_SET_REGISTER(0x01, "0x01");
 359 BD2802_SET_REGISTER(0x02, "0x02");
 360 BD2802_SET_REGISTER(0x03, "0x03");
 361 BD2802_SET_REGISTER(0x04, "0x04");
 362 BD2802_SET_REGISTER(0x05, "0x05");
 363 BD2802_SET_REGISTER(0x06, "0x06");
 364 BD2802_SET_REGISTER(0x07, "0x07");
 365 BD2802_SET_REGISTER(0x08, "0x08");
 366 BD2802_SET_REGISTER(0x09, "0x09");
 367 BD2802_SET_REGISTER(0x0a, "0x0a");
 368 BD2802_SET_REGISTER(0x0b, "0x0b");
 369 BD2802_SET_REGISTER(0x0c, "0x0c");
 370 BD2802_SET_REGISTER(0x0d, "0x0d");
 371 BD2802_SET_REGISTER(0x0e, "0x0e");
 372 BD2802_SET_REGISTER(0x0f, "0x0f");
 373 BD2802_SET_REGISTER(0x10, "0x10");
 374 BD2802_SET_REGISTER(0x11, "0x11");
 375 BD2802_SET_REGISTER(0x12, "0x12");
 376 BD2802_SET_REGISTER(0x13, "0x13");
 377 BD2802_SET_REGISTER(0x14, "0x14");
 378 BD2802_SET_REGISTER(0x15, "0x15");
 379
 380 static struct device_attribute *bd2802_addr_attributes[] = {
 381         &bd2802_reg0x00_attr,
 382         &bd2802_reg0x01_attr,
 383         &bd2802_reg0x02_attr,
 384         &bd2802_reg0x03_attr,
 385         &bd2802_reg0x04_attr,
 386         &bd2802_reg0x05_attr,
 387         &bd2802_reg0x06_attr,
 388         &bd2802_reg0x07_attr,
 389         &bd2802_reg0x08_attr,
 390         &bd2802_reg0x09_attr,
 391         &bd2802_reg0x0a_attr,
 392         &bd2802_reg0x0b_attr,
 393         &bd2802_reg0x0c_attr,
 394         &bd2802_reg0x0d_attr,
 395         &bd2802_reg0x0e_attr,
 396         &bd2802_reg0x0f_attr,
 397         &bd2802_reg0x10_attr,
 398         &bd2802_reg0x11_attr,
 399         &bd2802_reg0x12_attr,
 400         &bd2802_reg0x13_attr,
 401         &bd2802_reg0x14_attr,
 402         &bd2802_reg0x15_attr,
 403 };
 404
 405 static void bd2802_enable_adv_conf(struct bd2802_led *led)
 406 {
 407         int i, ret;
 408
 409         for (i = 0; i < ARRAY_SIZE(bd2802_addr_attributes); i++) {
 410                 ret = device_create_file(&led->client->dev,
 411                                                 bd2802_addr_attributes[i]);
 412                 if (ret) {
 413                         dev_err(&led->client->dev, "failed: sysfs file %s\n",
 414                                         bd2802_addr_attributes[i]->attr.name);
 415                         goto failed_remove_files;
 416                 }
 417         }
 418
 419         if (bd2802_is_all_off(led))
 420                 bd2802_reset_cancel(led);
 421
 422         led->adf_on = 1;
 423
 424         return;
 425
 426 failed_remove_files:
 427         for (i--; i >= 0; i--)
 428                 device_remove_file(&led->client->dev,
 429                                                 bd2802_addr_attributes[i]);
 430 }
 431
 432 static void bd2802_disable_adv_conf(struct bd2802_led *led)
 433 {
 434         int i;
 435
 436         for (i = 0; i < ARRAY_SIZE(bd2802_addr_attributes); i++)
 437                 device_remove_file(&led->client->dev,
 438                                                 bd2802_addr_attributes[i]);
 439
 440         if (bd2802_is_all_off(led))
 441                 gpio_set_value(led->pdata->reset_gpio, 0);
 442
 443         led->adf_on = 0;
 444 }
 445
 446 static ssize_t bd2802_show_adv_conf(struct device *dev,
 447         struct device_attribute *attr, char *buf)
 448 {
 449         struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));
 450         ssize_t ret;
 451
 452         down_read(&led->rwsem);
 453         if (led->adf_on)
 454                 ret = sprintf(buf, "on\n");
 455         else
 456                 ret = sprintf(buf, "off\n");
 457         up_read(&led->rwsem);
 458
 459         return ret;
 460 }
 461
 462 static ssize_t bd2802_store_adv_conf(struct device *dev,
 463         struct device_attribute *attr, const char *buf, size_t count)
 464 {
 465         struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));
 466
 467         if (!count)
 468                 return -EINVAL;
 469
 470         down_write(&led->rwsem);
 471         if (!led->adf_on && !strncmp(buf, "on", 2))
 472                 bd2802_enable_adv_conf(led);
 473         else if (led->adf_on && !strncmp(buf, "off", 3))
 474                 bd2802_disable_adv_conf(led);
 475         up_write(&led->rwsem);
 476
 477         return count;
 478 }
 479
 480 static struct device_attribute bd2802_adv_conf_attr = {
 481         .attr = {
 482                 .name = "advanced_configuration",
 483                 .mode = 0644,
 484                 .owner = THIS_MODULE
 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                 .owner = THIS_MODULE                                    \
 522         },                                                              \
 523         .show = bd2802_show_##attr_name,                                \
 524         .store = bd2802_store_##attr_name,                              \
 525 };
 526
 527 BD2802_CONTROL_ATTR(wave_pattern, "wave_pattern");
 528 BD2802_CONTROL_ATTR(rgb_current, "rgb_current");
 529
 530 static struct device_attribute *bd2802_attributes[] = {
 531         &bd2802_adv_conf_attr,
 532         &bd2802_wave_pattern_attr,
 533         &bd2802_rgb_current_attr,
 534 };
 535
 536 static void bd2802_led_work(struct work_struct *work)
 537 {
 538         struct bd2802_led *led = container_of(work, struct bd2802_led, work);
 539
 540         if (led->state)
 541                 bd2802_turn_on(led, led->led_id, led->color, led->state);
 542         else
 543                 bd2802_turn_off(led, led->led_id, led->color);
 544 }
 545
 546 #define BD2802_CONTROL_RGBS(name, id, clr)                              \
 547 static void bd2802_set_##name##_brightness(struct led_classdev *led_cdev,\
 548                                         enum led_brightness value)      \
 549 {                                                                       \
 550         struct bd2802_led *led =                                        \
 551                 container_of(led_cdev, struct bd2802_led, cdev_##name); \
 552         led->led_id = id;                                               \
 553         led->color = clr;                                               \
 554         if (value == LED_OFF)                                           \
 555                 led->state = BD2802_OFF;                                \
 556         else                                                            \
 557                 led->state = BD2802_ON;                                 \
 558         schedule_work(&led->work);                                      \
 559 }                                                                       \
 560 static int bd2802_set_##name##_blink(struct led_classdev *led_cdev,     \
 561                 unsigned long *delay_on, unsigned long *delay_off)      \
 562 {                                                                       \
 563         struct bd2802_led *led =                                        \
 564                 container_of(led_cdev, struct bd2802_led, cdev_##name); \
 565         if (*delay_on == 0 || *delay_off == 0)                          \
 566                 return -EINVAL;                                         \
 567         led->led_id = id;                                               \
 568         led->color = clr;                                               \
 569         led->state = BD2802_BLINK;                                      \
 570         schedule_work(&led->work);                                      \
 571         return 0;                                                       \
 572 }
 573
 574 BD2802_CONTROL_RGBS(led1r, LED1, RED);
 575 BD2802_CONTROL_RGBS(led1g, LED1, GREEN);
 576 BD2802_CONTROL_RGBS(led1b, LED1, BLUE);
 577 BD2802_CONTROL_RGBS(led2r, LED2, RED);
 578 BD2802_CONTROL_RGBS(led2g, LED2, GREEN);
 579 BD2802_CONTROL_RGBS(led2b, LED2, BLUE);
 580
 581 static int bd2802_register_led_classdev(struct bd2802_led *led)
 582 {
 583         int ret;
 584
 585         INIT_WORK(&led->work, bd2802_led_work);
 586
 587         led->cdev_led1r.name = "led1_R";
 588         led->cdev_led1r.brightness = LED_OFF;
 589         led->cdev_led1r.brightness_set = bd2802_set_led1r_brightness;
 590         led->cdev_led1r.blink_set = bd2802_set_led1r_blink;
 591
 592         ret = led_classdev_register(&led->client->dev, &led->cdev_led1r);
 593         if (ret < 0) {
 594                 dev_err(&led->client->dev, "couldn't register LED %s\n",
 595                                                         led->cdev_led1r.name);
 596                 goto failed_unregister_led1_R;
 597         }
 598
 599         led->cdev_led1g.name = "led1_G";
 600         led->cdev_led1g.brightness = LED_OFF;
 601         led->cdev_led1g.brightness_set = bd2802_set_led1g_brightness;
 602         led->cdev_led1g.blink_set = bd2802_set_led1g_blink;
 603
 604         ret = led_classdev_register(&led->client->dev, &led->cdev_led1g);
 605         if (ret < 0) {
 606                 dev_err(&led->client->dev, "couldn't register LED %s\n",
 607                                                         led->cdev_led1g.name);
 608                 goto failed_unregister_led1_G;
 609         }
 610
 611         led->cdev_led1b.name = "led1_B";
 612         led->cdev_led1b.brightness = LED_OFF;
 613         led->cdev_led1b.brightness_set = bd2802_set_led1b_brightness;
 614         led->cdev_led1b.blink_set = bd2802_set_led1b_blink;
 615
 616         ret = led_classdev_register(&led->client->dev, &led->cdev_led1b);
 617         if (ret < 0) {
 618                 dev_err(&led->client->dev, "couldn't register LED %s\n",
 619                                                         led->cdev_led1b.name);
 620                 goto failed_unregister_led1_B;
 621         }
 622
 623         led->cdev_led2r.name = "led2_R";
 624         led->cdev_led2r.brightness = LED_OFF;
 625         led->cdev_led2r.brightness_set = bd2802_set_led2r_brightness;
 626         led->cdev_led2r.blink_set = bd2802_set_led2r_blink;
 627
 628         ret = led_classdev_register(&led->client->dev, &led->cdev_led2r);
 629         if (ret < 0) {
 630                 dev_err(&led->client->dev, "couldn't register LED %s\n",
 631                                                         led->cdev_led2r.name);
 632                 goto failed_unregister_led2_R;
 633         }
 634
 635         led->cdev_led2g.name = "led2_G";
 636         led->cdev_led2g.brightness = LED_OFF;
 637         led->cdev_led2g.brightness_set = bd2802_set_led2g_brightness;
 638         led->cdev_led2g.blink_set = bd2802_set_led2g_blink;
 639
 640         ret = led_classdev_register(&led->client->dev, &led->cdev_led2g);
 641         if (ret < 0) {
 642                 dev_err(&led->client->dev, "couldn't register LED %s\n",
 643                                                         led->cdev_led2g.name);
 644                 goto failed_unregister_led2_G;
 645         }
 646
 647         led->cdev_led2b.name = "led2_B";
 648         led->cdev_led2b.brightness = LED_OFF;
 649         led->cdev_led2b.brightness_set = bd2802_set_led2b_brightness;
 650         led->cdev_led2b.blink_set = bd2802_set_led2b_blink;
 651         led->cdev_led2b.flags |= LED_CORE_SUSPENDRESUME;
 652
 653         ret = led_classdev_register(&led->client->dev, &led->cdev_led2b);
 654         if (ret < 0) {
 655                 dev_err(&led->client->dev, "couldn't register LED %s\n",
 656                                                         led->cdev_led2b.name);
 657                 goto failed_unregister_led2_B;
 658         }
 659
 660         return 0;
 661
 662 failed_unregister_led2_B:
 663         led_classdev_unregister(&led->cdev_led2g);
 664 failed_unregister_led2_G:
 665         led_classdev_unregister(&led->cdev_led2r);
 666 failed_unregister_led2_R:
 667         led_classdev_unregister(&led->cdev_led1b);
 668 failed_unregister_led1_B:
 669         led_classdev_unregister(&led->cdev_led1g);
 670 failed_unregister_led1_G:
 671         led_classdev_unregister(&led->cdev_led1r);
 672 failed_unregister_led1_R:
 673
 674         return ret;
 675 }
 676
 677 static void bd2802_unregister_led_classdev(struct bd2802_led *led)
 678 {
 679         cancel_work_sync(&led->work);
 680         led_classdev_unregister(&led->cdev_led1r);
 681 }
 682
 683 static int __devinit bd2802_probe(struct i2c_client *client,
 684                         const struct i2c_device_id *id)
 685 {
 686         struct bd2802_led *led;
 687         struct bd2802_led_platform_data *pdata;
 688         int ret, i;
 689
 690         led = kzalloc(sizeof(struct bd2802_led), GFP_KERNEL);
 691         if (!led) {
 692                 dev_err(&client->dev, "failed to allocate driver data\n");
 693                 return -ENOMEM;
 694         }
 695
 696         led->client = client;
 697         pdata = led->pdata = client->dev.platform_data;
 698         i2c_set_clientdata(client, led);
 699
 700         /* Configure RESET GPIO (L: RESET, H: RESET cancel) */
 701         gpio_request(pdata->reset_gpio, "RGB_RESETB");
 702         gpio_direction_output(pdata->reset_gpio, 1);
 703
 704         /* Tacss = min 0.1ms */
 705         udelay(100);
 706
 707         /* Detect BD2802GU */
 708         ret = bd2802_write_byte(client, BD2802_REG_CLKSETUP, 0x00);
 709         if (ret < 0) {
 710                 dev_err(&client->dev, "failed to detect device\n");
 711                 goto failed_free;
 712         } else
 713                 dev_info(&client->dev, "return 0x%02x\n", ret);
 714
 715         /* To save the power, reset BD2802 after detecting */
 716         gpio_set_value(led->pdata->reset_gpio, 0);
 717
 718         /* Default attributes */
 719         led->wave_pattern = BD2802_PATTERN_HALF;
 720         led->rgb_current = BD2802_CURRENT_032;
 721
 722         init_rwsem(&led->rwsem);
 723
 724         for (i = 0; i < ARRAY_SIZE(bd2802_attributes); i++) {
 725                 ret = device_create_file(&led->client->dev,
 726                                                 bd2802_attributes[i]);
 727                 if (ret) {
 728                         dev_err(&led->client->dev, "failed: sysfs file %s\n",
 729                                         bd2802_attributes[i]->attr.name);
 730                         goto failed_unregister_dev_file;
 731                 }
 732         }
 733
 734         ret = bd2802_register_led_classdev(led);
 735         if (ret < 0)
 736                 goto failed_unregister_dev_file;
 737
 738         return 0;
 739
 740 failed_unregister_dev_file:
 741         for (i--; i >= 0; i--)
 742                 device_remove_file(&led->client->dev, bd2802_attributes[i]);
 743 failed_free:
 744         i2c_set_clientdata(client, NULL);
 745         kfree(led);
 746
 747         return ret;
 748 }
 749
 750 static int __exit bd2802_remove(struct i2c_client *client)
 751 {
 752         struct bd2802_led *led = i2c_get_clientdata(client);
 753         int i;
 754
 755         gpio_set_value(led->pdata->reset_gpio, 0);
 756         bd2802_unregister_led_classdev(led);
 757         if (led->adf_on)
 758                 bd2802_disable_adv_conf(led);
 759         for (i = 0; i < ARRAY_SIZE(bd2802_attributes); i++)
 760                 device_remove_file(&led->client->dev, bd2802_attributes[i]);
 761         i2c_set_clientdata(client, NULL);
 762         kfree(led);
 763
 764         return 0;
 765 }
 766
 767 static int bd2802_suspend(struct i2c_client *client, pm_message_t mesg)
 768 {
 769         struct bd2802_led *led = i2c_get_clientdata(client);
 770
 771         gpio_set_value(led->pdata->reset_gpio, 0);
 772
 773         return 0;
 774 }
 775
 776 static int bd2802_resume(struct i2c_client *client)
 777 {
 778         struct bd2802_led *led = i2c_get_clientdata(client);
 779
 780         if (!bd2802_is_all_off(led) || led->adf_on) {
 781                 bd2802_reset_cancel(led);
 782                 bd2802_restore_state(led);
 783         }
 784
 785         return 0;
 786 }
 787
 788 static const struct i2c_device_id bd2802_id[] = {
 789         { "BD2802", 0 },
 790         { }
 791 };
 792 MODULE_DEVICE_TABLE(i2c, bd2802_id);
 793
 794 static struct i2c_driver bd2802_i2c_driver = {
 795         .driver = {
 796                 .name   = "BD2802",
 797         },
 798         .probe          = bd2802_probe,
 799         .remove         = __exit_p(bd2802_remove),
 800         .suspend        = bd2802_suspend,
 801         .resume         = bd2802_resume,
 802         .id_table       = bd2802_id,
 803 };
 804
 805 static int __init bd2802_init(void)
 806 {
 807         return i2c_add_driver(&bd2802_i2c_driver);
 808 }
 809 module_init(bd2802_init);
 810
 811 static void __exit bd2802_exit(void)
 812 {
 813         i2c_del_driver(&bd2802_i2c_driver);
 814 }
 815 module_exit(bd2802_exit);
 816
 817 MODULE_AUTHOR("Kim Kyuwon <q1.kim@samsung.com>");
 818 MODULE_DESCRIPTION("BD2802 LED driver");
 819 MODULE_LICENSE("GPL v2");