drivers/leds/leds-bd2802.c

   1 /*
   2  * leds-bd2802.c - RGB LED Driver
   3  *
   4  * Copyright (C) 2009 Samsung Electronics
   5  * Kim Kyuwon <q1.kim@samsung.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  * Datasheet: http://www.rohm.com/products/databook/driver/pdf/bd2802gu-e.pdf
  12  *
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/i2c.h>
  17 #include <linux/gpio.h>
  18 #include <linux/delay.h>
  19 #include <linux/leds.h>
  20 #include <linux/leds-bd2802.h>
  21 #include <linux/slab.h>
  22 #include <linux/pm.h>
  23
  24 #define LED_CTL(rgb2en, rgb1en) ((rgb2en) << 4 | ((rgb1en) << 0))
  25
  26 #define BD2802_LED_OFFSET               0xa
  27 #define BD2802_COLOR_OFFSET             0x3
  28
  29 #define BD2802_REG_CLKSETUP             0x00
  30 #define BD2802_REG_CONTROL              0x01
  31 #define BD2802_REG_HOURSETUP            0x02
  32 #define BD2802_REG_CURRENT1SETUP        0x03
  33 #define BD2802_REG_CURRENT2SETUP        0x04
  34 #define BD2802_REG_WAVEPATTERN          0x05
  35
  36 #define BD2802_CURRENT_032              0x10 /* 3.2mA */
  37 #define BD2802_CURRENT_000              0x00 /* 0.0mA */
  38
  39 #define BD2802_PATTERN_FULL             0x07
  40 #define BD2802_PATTERN_HALF             0x03
  41
  42 enum led_ids {
  43         LED1,
  44         LED2,
  45         LED_NUM,
  46 };
  47
  48 enum led_colors {
  49         RED,
  50         GREEN,
  51         BLUE,
  52 };
  53
  54 enum led_bits {
  55         BD2802_OFF,
  56         BD2802_BLINK,
  57         BD2802_ON,
  58 };
  59
  60 /*
  61  * State '0' : 'off'
  62  * State '1' : 'blink'
  63  * State '2' : 'on'.
  64  */
  65 struct led_state {
  66         unsigned r:2;
  67         unsigned g:2;
  68         unsigned b:2;
  69 };
  70
  71 struct bd2802_led {
  72         struct bd2802_led_platform_data *pdata;
  73         struct i2c_client               *client;
  74         struct rw_semaphore             rwsem;
  75         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 #define BD2802_SET_REGISTER(reg_addr, reg_name)                         \
 323 static ssize_t bd2802_store_reg##reg_addr(struct device *dev,           \
 324         struct device_attribute *attr, const char *buf, size_t count)   \
 325 {                                                                       \
 326         struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\
 327         unsigned long val;                                              \
 328         int ret;                                                        \
 329         if (!count)                                                     \
 330                 return -EINVAL;                                         \
 331         ret = strict_strtoul(buf, 16, &val);                            \
 332         if (ret)                                                        \
 333                 return ret;                                             \
 334         down_write(&led->rwsem);                                        \
 335         bd2802_write_byte(led->client, reg_addr, (u8) val);             \
 336         up_write(&led->rwsem);                                          \
 337         return count;                                                   \
 338 }                                                                       \
 339 static struct device_attribute bd2802_reg##reg_addr##_attr = {          \
 340         .attr = {.name = reg_name, .mode = 0644},                       \
 341         .store = bd2802_store_reg##reg_addr,                            \
 342 };
 343
 344 BD2802_SET_REGISTER(0x00, "0x00");
 345 BD2802_SET_REGISTER(0x01, "0x01");
 346 BD2802_SET_REGISTER(0x02, "0x02");
 347 BD2802_SET_REGISTER(0x03, "0x03");
 348 BD2802_SET_REGISTER(0x04, "0x04");
 349 BD2802_SET_REGISTER(0x05, "0x05");
 350 BD2802_SET_REGISTER(0x06, "0x06");
 351 BD2802_SET_REGISTER(0x07, "0x07");
 352 BD2802_SET_REGISTER(0x08, "0x08");
 353 BD2802_SET_REGISTER(0x09, "0x09");
 354 BD2802_SET_REGISTER(0x0a, "0x0a");
 355 BD2802_SET_REGISTER(0x0b, "0x0b");
 356 BD2802_SET_REGISTER(0x0c, "0x0c");
 357 BD2802_SET_REGISTER(0x0d, "0x0d");
 358 BD2802_SET_REGISTER(0x0e, "0x0e");
 359 BD2802_SET_REGISTER(0x0f, "0x0f");
 360 BD2802_SET_REGISTER(0x10, "0x10");
 361 BD2802_SET_REGISTER(0x11, "0x11");
 362 BD2802_SET_REGISTER(0x12, "0x12");
 363 BD2802_SET_REGISTER(0x13, "0x13");
 364 BD2802_SET_REGISTER(0x14, "0x14");
 365 BD2802_SET_REGISTER(0x15, "0x15");
 366
 367 static struct device_attribute *bd2802_addr_attributes[] = {
 368         &bd2802_reg0x00_attr,
 369         &bd2802_reg0x01_attr,
 370         &bd2802_reg0x02_attr,
 371         &bd2802_reg0x03_attr,
 372         &bd2802_reg0x04_attr,
 373         &bd2802_reg0x05_attr,
 374         &bd2802_reg0x06_attr,
 375         &bd2802_reg0x07_attr,
 376         &bd2802_reg0x08_attr,
 377         &bd2802_reg0x09_attr,
 378         &bd2802_reg0x0a_attr,
 379         &bd2802_reg0x0b_attr,
 380         &bd2802_reg0x0c_attr,
 381         &bd2802_reg0x0d_attr,
 382         &bd2802_reg0x0e_attr,
 383         &bd2802_reg0x0f_attr,
 384         &bd2802_reg0x10_attr,
 385         &bd2802_reg0x11_attr,
 386         &bd2802_reg0x12_attr,
 387         &bd2802_reg0x13_attr,
 388         &bd2802_reg0x14_attr,
 389         &bd2802_reg0x15_attr,
 390 };
 391
 392 static void bd2802_enable_adv_conf(struct bd2802_led *led)
 393 {
 394         int i, ret;
 395
 396         for (i = 0; i < ARRAY_SIZE(bd2802_addr_attributes); i++) {
 397                 ret = device_create_file(&led->client->dev,
 398                                                 bd2802_addr_attributes[i]);
 399                 if (ret) {
 400                         dev_err(&led->client->dev, "failed: sysfs file %s\n",
 401                                         bd2802_addr_attributes[i]->attr.name);
 402                         goto failed_remove_files;
 403                 }
 404         }
 405
 406         if (bd2802_is_all_off(led))
 407                 bd2802_reset_cancel(led);
 408
 409         led->adf_on = 1;
 410
 411         return;
 412
 413 failed_remove_files:
 414         for (i--; i >= 0; i--)
 415                 device_remove_file(&led->client->dev,
 416                                                 bd2802_addr_attributes[i]);
 417 }
 418
 419 static void bd2802_disable_adv_conf(struct bd2802_led *led)
 420 {
 421         int i;
 422
 423         for (i = 0; i < ARRAY_SIZE(bd2802_addr_attributes); i++)
 424                 device_remove_file(&led->client->dev,
 425                                                 bd2802_addr_attributes[i]);
 426
 427         if (bd2802_is_all_off(led))
 428                 gpio_set_value(led->pdata->reset_gpio, 0);
 429
 430         led->adf_on = 0;
 431 }
 432
 433 static ssize_t bd2802_show_adv_conf(struct device *dev,
 434         struct device_attribute *attr, char *buf)
 435 {
 436         struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));
 437         ssize_t ret;
 438
 439         down_read(&led->rwsem);
 440         if (led->adf_on)
 441                 ret = sprintf(buf, "on\n");
 442         else
 443                 ret = sprintf(buf, "off\n");
 444         up_read(&led->rwsem);
 445
 446         return ret;
 447 }
 448
 449 static ssize_t bd2802_store_adv_conf(struct device *dev,
 450         struct device_attribute *attr, const char *buf, size_t count)
 451 {
 452         struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));
 453
 454         if (!count)
 455                 return -EINVAL;
 456
 457         down_write(&led->rwsem);
 458         if (!led->adf_on && !strncmp(buf, "on", 2))
 459                 bd2802_enable_adv_conf(led);
 460         else if (led->adf_on && !strncmp(buf, "off", 3))
 461                 bd2802_disable_adv_conf(led);
 462         up_write(&led->rwsem);
 463
 464         return count;
 465 }
 466
 467 static struct device_attribute bd2802_adv_conf_attr = {
 468         .attr = {
 469                 .name = "advanced_configuration",
 470                 .mode = 0644,
 471         },
 472         .show = bd2802_show_adv_conf,
 473         .store = bd2802_store_adv_conf,
 474 };
 475
 476 #define BD2802_CONTROL_ATTR(attr_name, name_str)                        \
 477 static ssize_t bd2802_show_##attr_name(struct device *dev,              \
 478         struct device_attribute *attr, char *buf)                       \
 479 {                                                                       \
 480         struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\
 481         ssize_t ret;                                                    \
 482         down_read(&led->rwsem);                                         \
 483         ret = sprintf(buf, "0x%02x\n", led->attr_name);                 \
 484         up_read(&led->rwsem);                                           \
 485         return ret;                                                     \
 486 }                                                                       \
 487 static ssize_t bd2802_store_##attr_name(struct device *dev,             \
 488         struct device_attribute *attr, const char *buf, size_t count)   \
 489 {                                                                       \
 490         struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\
 491         unsigned long val;                                              \
 492         int ret;                                                        \
 493         if (!count)                                                     \
 494                 return -EINVAL;                                         \
 495         ret = strict_strtoul(buf, 16, &val);                            \
 496         if (ret)                                                        \
 497                 return ret;                                             \
 498         down_write(&led->rwsem);                                        \
 499         led->attr_name = val;                                           \
 500         up_write(&led->rwsem);                                          \
 501         return count;                                                   \
 502 }                                                                       \
 503 static struct device_attribute bd2802_##attr_name##_attr = {            \
 504         .attr = {                                                       \
 505                 .name = name_str,                                       \
 506                 .mode = 0644,                                           \
 507         },                                                              \
 508         .show = bd2802_show_##attr_name,                                \
 509         .store = bd2802_store_##attr_name,                              \
 510 };
 511
 512 BD2802_CONTROL_ATTR(wave_pattern, "wave_pattern");
 513 BD2802_CONTROL_ATTR(rgb_current, "rgb_current");
 514
 515 static struct device_attribute *bd2802_attributes[] = {
 516         &bd2802_adv_conf_attr,
 517         &bd2802_wave_pattern_attr,
 518         &bd2802_rgb_current_attr,
 519 };
 520
 521 static void bd2802_led_work(struct work_struct *work)
 522 {
 523         struct bd2802_led *led = container_of(work, struct bd2802_led, work);
 524
 525         if (led->state)
 526                 bd2802_turn_on(led, led->led_id, led->color, led->state);
 527         else
 528                 bd2802_turn_off(led, led->led_id, led->color);
 529 }
 530
 531 #define BD2802_CONTROL_RGBS(name, id, clr)                              \
 532 static void bd2802_set_##name##_brightness(struct led_classdev *led_cdev,\
 533                                         enum led_brightness value)      \
 534 {                                                                       \
 535         struct bd2802_led *led =                                        \
 536                 container_of(led_cdev, struct bd2802_led, cdev_##name); \
 537         led->led_id = id;                                               \
 538         led->color = clr;                                               \
 539         if (value == LED_OFF)                                           \
 540                 led->state = BD2802_OFF;                                \
 541         else                                                            \
 542                 led->state = BD2802_ON;                                 \
 543         schedule_work(&led->work);                                      \
 544 }                                                                       \
 545 static int bd2802_set_##name##_blink(struct led_classdev *led_cdev,     \
 546                 unsigned long *delay_on, unsigned long *delay_off)      \
 547 {                                                                       \
 548         struct bd2802_led *led =                                        \
 549                 container_of(led_cdev, struct bd2802_led, cdev_##name); \
 550         if (*delay_on == 0 || *delay_off == 0)                          \
 551                 return -EINVAL;                                         \
 552         led->led_id = id;                                               \
 553         led->color = clr;                                               \
 554         led->state = BD2802_BLINK;                                      \
 555         schedule_work(&led->work);                                      \
 556         return 0;                                                       \
 557 }
 558
 559 BD2802_CONTROL_RGBS(led1r, LED1, RED);
 560 BD2802_CONTROL_RGBS(led1g, LED1, GREEN);
 561 BD2802_CONTROL_RGBS(led1b, LED1, BLUE);
 562 BD2802_CONTROL_RGBS(led2r, LED2, RED);
 563 BD2802_CONTROL_RGBS(led2g, LED2, GREEN);
 564 BD2802_CONTROL_RGBS(led2b, LED2, BLUE);
 565
 566 static int bd2802_register_led_classdev(struct bd2802_led *led)
 567 {
 568         int ret;
 569
 570         INIT_WORK(&led->work, bd2802_led_work);
 571
 572         led->cdev_led1r.name = "led1_R";
 573         led->cdev_led1r.brightness = LED_OFF;
 574         led->cdev_led1r.brightness_set = bd2802_set_led1r_brightness;
 575         led->cdev_led1r.blink_set = bd2802_set_led1r_blink;
 576
 577         ret = led_classdev_register(&led->client->dev, &led->cdev_led1r);
 578         if (ret < 0) {
 579                 dev_err(&led->client->dev, "couldn't register LED %s\n",
 580                                                         led->cdev_led1r.name);
 581                 goto failed_unregister_led1_R;
 582         }
 583
 584         led->cdev_led1g.name = "led1_G";
 585         led->cdev_led1g.brightness = LED_OFF;
 586         led->cdev_led1g.brightness_set = bd2802_set_led1g_brightness;
 587         led->cdev_led1g.blink_set = bd2802_set_led1g_blink;
 588
 589         ret = led_classdev_register(&led->client->dev, &led->cdev_led1g);
 590         if (ret < 0) {
 591                 dev_err(&led->client->dev, "couldn't register LED %s\n",
 592                                                         led->cdev_led1g.name);
 593                 goto failed_unregister_led1_G;
 594         }
 595
 596         led->cdev_led1b.name = "led1_B";
 597         led->cdev_led1b.brightness = LED_OFF;
 598         led->cdev_led1b.brightness_set = bd2802_set_led1b_brightness;
 599         led->cdev_led1b.blink_set = bd2802_set_led1b_blink;
 600
 601         ret = led_classdev_register(&led->client->dev, &led->cdev_led1b);
 602         if (ret < 0) {
 603                 dev_err(&led->client->dev, "couldn't register LED %s\n",
 604                                                         led->cdev_led1b.name);
 605                 goto failed_unregister_led1_B;
 606         }
 607
 608         led->cdev_led2r.name = "led2_R";
 609         led->cdev_led2r.brightness = LED_OFF;
 610         led->cdev_led2r.brightness_set = bd2802_set_led2r_brightness;
 611         led->cdev_led2r.blink_set = bd2802_set_led2r_blink;
 612
 613         ret = led_classdev_register(&led->client->dev, &led->cdev_led2r);
 614         if (ret < 0) {
 615                 dev_err(&led->client->dev, "couldn't register LED %s\n",
 616                                                         led->cdev_led2r.name);
 617                 goto failed_unregister_led2_R;
 618         }
 619
 620         led->cdev_led2g.name = "led2_G";
 621         led->cdev_led2g.brightness = LED_OFF;
 622         led->cdev_led2g.brightness_set = bd2802_set_led2g_brightness;
 623         led->cdev_led2g.blink_set = bd2802_set_led2g_blink;
 624
 625         ret = led_classdev_register(&led->client->dev, &led->cdev_led2g);
 626         if (ret < 0) {
 627                 dev_err(&led->client->dev, "couldn't register LED %s\n",
 628                                                         led->cdev_led2g.name);
 629                 goto failed_unregister_led2_G;
 630         }
 631
 632         led->cdev_led2b.name = "led2_B";
 633         led->cdev_led2b.brightness = LED_OFF;
 634         led->cdev_led2b.brightness_set = bd2802_set_led2b_brightness;
 635         led->cdev_led2b.blink_set = bd2802_set_led2b_blink;
 636         led->cdev_led2b.flags |= LED_CORE_SUSPENDRESUME;
 637
 638         ret = led_classdev_register(&led->client->dev, &led->cdev_led2b);
 639         if (ret < 0) {
 640                 dev_err(&led->client->dev, "couldn't register LED %s\n",
 641                                                         led->cdev_led2b.name);
 642                 goto failed_unregister_led2_B;
 643         }
 644
 645         return 0;
 646
 647 failed_unregister_led2_B:
 648         led_classdev_unregister(&led->cdev_led2g);
 649 failed_unregister_led2_G:
 650         led_classdev_unregister(&led->cdev_led2r);
 651 failed_unregister_led2_R:
 652         led_classdev_unregister(&led->cdev_led1b);
 653 failed_unregister_led1_B:
 654         led_classdev_unregister(&led->cdev_led1g);
 655 failed_unregister_led1_G:
 656         led_classdev_unregister(&led->cdev_led1r);
 657 failed_unregister_led1_R:
 658
 659         return ret;
 660 }
 661
 662 static void bd2802_unregister_led_classdev(struct bd2802_led *led)
 663 {
 664         cancel_work_sync(&led->work);
 665         led_classdev_unregister(&led->cdev_led1r);
 666 }
 667
 668 static int __devinit bd2802_probe(struct i2c_client *client,
 669                         const struct i2c_device_id *id)
 670 {
 671         struct bd2802_led *led;
 672         struct bd2802_led_platform_data *pdata;
 673         int ret, i;
 674
 675         led = kzalloc(sizeof(struct bd2802_led), GFP_KERNEL);
 676         if (!led) {
 677                 dev_err(&client->dev, "failed to allocate driver data\n");
 678                 return -ENOMEM;
 679         }
 680
 681         led->client = client;
 682         pdata = led->pdata = client->dev.platform_data;
 683         i2c_set_clientdata(client, led);
 684
 685         /* Configure RESET GPIO (L: RESET, H: RESET cancel) */
 686         gpio_request(pdata->reset_gpio, "RGB_RESETB");
 687         gpio_direction_output(pdata->reset_gpio, 1);
 688
 689         /* Tacss = min 0.1ms */
 690         udelay(100);
 691
 692         /* Detect BD2802GU */
 693         ret = bd2802_write_byte(client, BD2802_REG_CLKSETUP, 0x00);
 694         if (ret < 0) {
 695                 dev_err(&client->dev, "failed to detect device\n");
 696                 goto failed_free;
 697         } else
 698                 dev_info(&client->dev, "return 0x%02x\n", ret);
 699
 700         /* To save the power, reset BD2802 after detecting */
 701         gpio_set_value(led->pdata->reset_gpio, 0);
 702
 703         /* Default attributes */
 704         led->wave_pattern = BD2802_PATTERN_HALF;
 705         led->rgb_current = BD2802_CURRENT_032;
 706
 707         init_rwsem(&led->rwsem);
 708
 709         for (i = 0; i < ARRAY_SIZE(bd2802_attributes); i++) {
 710                 ret = device_create_file(&led->client->dev,
 711                                                 bd2802_attributes[i]);
 712                 if (ret) {
 713                         dev_err(&led->client->dev, "failed: sysfs file %s\n",
 714                                         bd2802_attributes[i]->attr.name);
 715                         goto failed_unregister_dev_file;
 716                 }
 717         }
 718
 719         ret = bd2802_register_led_classdev(led);
 720         if (ret < 0)
 721                 goto failed_unregister_dev_file;
 722
 723         return 0;
 724
 725 failed_unregister_dev_file:
 726         for (i--; i >= 0; i--)
 727                 device_remove_file(&led->client->dev, bd2802_attributes[i]);
 728 failed_free:
 729         kfree(led);
 730
 731         return ret;
 732 }
 733
 734 static int __exit bd2802_remove(struct i2c_client *client)
 735 {
 736         struct bd2802_led *led = i2c_get_clientdata(client);
 737         int i;
 738
 739         gpio_set_value(led->pdata->reset_gpio, 0);
 740         bd2802_unregister_led_classdev(led);
 741         if (led->adf_on)
 742                 bd2802_disable_adv_conf(led);
 743         for (i = 0; i < ARRAY_SIZE(bd2802_attributes); i++)
 744                 device_remove_file(&led->client->dev, bd2802_attributes[i]);
 745         kfree(led);
 746
 747         return 0;
 748 }
 749
 750 #ifdef CONFIG_PM
 751
 752 static void bd2802_restore_state(struct bd2802_led *led)
 753 {
 754         int i;
 755
 756         for (i = 0; i < LED_NUM; i++) {
 757                 if (led->led[i].r)
 758                         bd2802_turn_on(led, i, RED, led->led[i].r);
 759                 if (led->led[i].g)
 760                         bd2802_turn_on(led, i, GREEN, led->led[i].g);
 761                 if (led->led[i].b)
 762                         bd2802_turn_on(led, i, BLUE, led->led[i].b);
 763         }
 764 }
 765
 766 static int bd2802_suspend(struct device *dev)
 767 {
 768         struct i2c_client *client = to_i2c_client(dev);
 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 device *dev)
 777 {
 778         struct i2c_client *client = to_i2c_client(dev);
 779         struct bd2802_led *led = i2c_get_clientdata(client);
 780
 781         if (!bd2802_is_all_off(led) || led->adf_on) {
 782                 bd2802_reset_cancel(led);
 783                 bd2802_restore_state(led);
 784         }
 785
 786         return 0;
 787 }
 788
 789 static SIMPLE_DEV_PM_OPS(bd2802_pm, bd2802_suspend, bd2802_resume);
 790 #define BD2802_PM (&bd2802_pm)
 791 #else           /* CONFIG_PM */
 792 #define BD2802_PM NULL
 793 #endif
 794
 795 static const struct i2c_device_id bd2802_id[] = {
 796         { "BD2802", 0 },
 797         { }
 798 };
 799 MODULE_DEVICE_TABLE(i2c, bd2802_id);
 800
 801 static struct i2c_driver bd2802_i2c_driver = {
 802         .driver = {
 803                 .name   = "BD2802",
 804                 .pm     = BD2802_PM,
 805         },
 806         .probe          = bd2802_probe,
 807         .remove         = __exit_p(bd2802_remove),
 808         .id_table       = bd2802_id,
 809 };
 810
 811 static int __init bd2802_init(void)
 812 {
 813         return i2c_add_driver(&bd2802_i2c_driver);
 814 }
 815 module_init(bd2802_init);
 816
 817 static void __exit bd2802_exit(void)
 818 {
 819         i2c_del_driver(&bd2802_i2c_driver);
 820 }
 821 module_exit(bd2802_exit);
 822
 823 MODULE_AUTHOR("Kim Kyuwon <q1.kim@samsung.com>");
 824 MODULE_DESCRIPTION("BD2802 LED driver");
 825 MODULE_LICENSE("GPL v2");