drivers/leds/leds-bd2802.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * leds-bd2802.c - RGB LED Driver
   4  *
   5  * Copyright (C) 2009 Samsung Electronics
   6  * Kim Kyuwon <q1.kim@samsung.com>
   7  *
   8  * Datasheet: http://www.rohm.com/products/databook/driver/pdf/bd2802gu-e.pdf
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/i2c.h>
  13 #include <linux/gpio/consumer.h>
  14 #include <linux/delay.h>
  15 #include <linux/leds.h>
  16 #include <linux/leds-bd2802.h>
  17 #include <linux/slab.h>
  18 #include <linux/pm.h>
  19
  20 #define LED_CTL(rgb2en, rgb1en) ((rgb2en) << 4 | ((rgb1en) << 0))
  21
  22 #define BD2802_LED_OFFSET               0xa
  23 #define BD2802_COLOR_OFFSET             0x3
  24
  25 #define BD2802_REG_CLKSETUP             0x00
  26 #define BD2802_REG_CONTROL              0x01
  27 #define BD2802_REG_HOURSETUP            0x02
  28 #define BD2802_REG_CURRENT1SETUP        0x03
  29 #define BD2802_REG_CURRENT2SETUP        0x04
  30 #define BD2802_REG_WAVEPATTERN          0x05
  31
  32 #define BD2802_CURRENT_032              0x10 /* 3.2mA */
  33 #define BD2802_CURRENT_000              0x00 /* 0.0mA */
  34
  35 #define BD2802_PATTERN_FULL             0x07
  36 #define BD2802_PATTERN_HALF             0x03
  37
  38 enum led_ids {
  39         LED1,
  40         LED2,
  41         LED_NUM,
  42 };
  43
  44 enum led_colors {
  45         RED,
  46         GREEN,
  47         BLUE,
  48 };
  49
  50 enum led_bits {
  51         BD2802_OFF,
  52         BD2802_BLINK,
  53         BD2802_ON,
  54 };
  55
  56 /*
  57  * State '0' : 'off'
  58  * State '1' : 'blink'
  59  * State '2' : 'on'.
  60  */
  61 struct led_state {
  62         unsigned r:2;
  63         unsigned g:2;
  64         unsigned b:2;
  65 };
  66
  67 struct bd2802_led {
  68         struct bd2802_led_platform_data *pdata;
  69         struct i2c_client               *client;
  70         struct gpio_desc                *reset;
  71         struct rw_semaphore             rwsem;
  72
  73         struct led_state                led[2];
  74
  75         /*
  76          * Making led_classdev as array is not recommended, because array
  77          * members prevent using 'container_of' macro. So repetitive works
  78          * are needed.
  79          */
  80         struct led_classdev             cdev_led1r;
  81         struct led_classdev             cdev_led1g;
  82         struct led_classdev             cdev_led1b;
  83         struct led_classdev             cdev_led2r;
  84         struct led_classdev             cdev_led2g;
  85         struct led_classdev             cdev_led2b;
  86
  87         /*
  88          * Advanced Configuration Function(ADF) mode:
  89          * In ADF mode, user can set registers of BD2802GU directly,
  90          * therefore BD2802GU doesn't enter reset state.
  91          */
  92         int                             adf_on;
  93
  94         enum led_ids                    led_id;
  95         enum led_colors                 color;
  96         enum led_bits                   state;
  97
  98         /* General attributes of RGB LEDs */
  99         int                             wave_pattern;
 100         int                             rgb_current;
 101 };
 102
 103
 104 /*--------------------------------------------------------------*/
 105 /*      BD2802GU helper functions                                       */
 106 /*--------------------------------------------------------------*/
 107
 108 static inline int bd2802_is_rgb_off(struct bd2802_led *led, enum led_ids id,
 109                                                         enum led_colors color)
 110 {
 111         switch (color) {
 112         case RED:
 113                 return !led->led[id].r;
 114         case GREEN:
 115                 return !led->led[id].g;
 116         case BLUE:
 117                 return !led->led[id].b;
 118         default:
 119                 dev_err(&led->client->dev, "%s: Invalid color\n", __func__);
 120                 return -EINVAL;
 121         }
 122 }
 123
 124 static inline int bd2802_is_led_off(struct bd2802_led *led, enum led_ids id)
 125 {
 126         if (led->led[id].r || led->led[id].g || led->led[id].b)
 127                 return 0;
 128
 129         return 1;
 130 }
 131
 132 static inline int bd2802_is_all_off(struct bd2802_led *led)
 133 {
 134         int i;
 135
 136         for (i = 0; i < LED_NUM; i++)
 137                 if (!bd2802_is_led_off(led, i))
 138                         return 0;
 139
 140         return 1;
 141 }
 142
 143 static inline u8 bd2802_get_base_offset(enum led_ids id, enum led_colors color)
 144 {
 145         return id * BD2802_LED_OFFSET + color * BD2802_COLOR_OFFSET;
 146 }
 147
 148 static inline u8 bd2802_get_reg_addr(enum led_ids id, enum led_colors color,
 149                                                                 u8 reg_offset)
 150 {
 151         return reg_offset + bd2802_get_base_offset(id, color);
 152 }
 153
 154
 155 /*--------------------------------------------------------------*/
 156 /*      BD2802GU core functions                                 */
 157 /*--------------------------------------------------------------*/
 158
 159 static int bd2802_write_byte(struct i2c_client *client, u8 reg, u8 val)
 160 {
 161         int ret = i2c_smbus_write_byte_data(client, reg, val);
 162         if (ret >= 0)
 163                 return 0;
 164
 165         dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n",
 166                                                 __func__, reg, val, ret);
 167
 168         return ret;
 169 }
 170
 171 static void bd2802_update_state(struct bd2802_led *led, enum led_ids id,
 172                                 enum led_colors color, enum led_bits led_bit)
 173 {
 174         int i;
 175         u8 value;
 176
 177         for (i = 0; i < LED_NUM; i++) {
 178                 if (i == id) {
 179                         switch (color) {
 180                         case RED:
 181                                 led->led[i].r = led_bit;
 182                                 break;
 183                         case GREEN:
 184                                 led->led[i].g = led_bit;
 185                                 break;
 186                         case BLUE:
 187                                 led->led[i].b = led_bit;
 188                                 break;
 189                         default:
 190                                 dev_err(&led->client->dev,
 191                                         "%s: Invalid color\n", __func__);
 192                                 return;
 193                         }
 194                 }
 195         }
 196
 197         if (led_bit == BD2802_BLINK || led_bit == BD2802_ON)
 198                 return;
 199
 200         if (!bd2802_is_led_off(led, id))
 201                 return;
 202
 203         if (bd2802_is_all_off(led) && !led->adf_on) {
 204                 gpiod_set_value(led->reset, 1);
 205                 return;
 206         }
 207
 208         /*
 209          * In this case, other led is turned on, and current led is turned
 210          * off. So set RGB LED Control register to stop the current RGB LED
 211          */
 212         value = (id == LED1) ? LED_CTL(1, 0) : LED_CTL(0, 1);
 213         bd2802_write_byte(led->client, BD2802_REG_CONTROL, value);
 214 }
 215
 216 static void bd2802_configure(struct bd2802_led *led)
 217 {
 218         struct bd2802_led_platform_data *pdata = led->pdata;
 219         u8 reg;
 220
 221         reg = bd2802_get_reg_addr(LED1, RED, BD2802_REG_HOURSETUP);
 222         bd2802_write_byte(led->client, reg, pdata->rgb_time);
 223
 224         reg = bd2802_get_reg_addr(LED2, RED, BD2802_REG_HOURSETUP);
 225         bd2802_write_byte(led->client, reg, pdata->rgb_time);
 226 }
 227
 228 static void bd2802_reset_cancel(struct bd2802_led *led)
 229 {
 230         gpiod_set_value(led->reset, 0);
 231         udelay(100);
 232         bd2802_configure(led);
 233 }
 234
 235 static void bd2802_enable(struct bd2802_led *led, enum led_ids id)
 236 {
 237         enum led_ids other_led = (id == LED1) ? LED2 : LED1;
 238         u8 value, other_led_on;
 239
 240         other_led_on = !bd2802_is_led_off(led, other_led);
 241         if (id == LED1)
 242                 value = LED_CTL(other_led_on, 1);
 243         else
 244                 value = LED_CTL(1 , other_led_on);
 245
 246         bd2802_write_byte(led->client, BD2802_REG_CONTROL, value);
 247 }
 248
 249 static void bd2802_set_on(struct bd2802_led *led, enum led_ids id,
 250                                                         enum led_colors color)
 251 {
 252         u8 reg;
 253
 254         if (bd2802_is_all_off(led) && !led->adf_on)
 255                 bd2802_reset_cancel(led);
 256
 257         reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT1SETUP);
 258         bd2802_write_byte(led->client, reg, led->rgb_current);
 259         reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT2SETUP);
 260         bd2802_write_byte(led->client, reg, BD2802_CURRENT_000);
 261         reg = bd2802_get_reg_addr(id, color, BD2802_REG_WAVEPATTERN);
 262         bd2802_write_byte(led->client, reg, BD2802_PATTERN_FULL);
 263
 264         bd2802_enable(led, id);
 265         bd2802_update_state(led, id, color, BD2802_ON);
 266 }
 267
 268 static void bd2802_set_blink(struct bd2802_led *led, enum led_ids id,
 269                                                         enum led_colors color)
 270 {
 271         u8 reg;
 272
 273         if (bd2802_is_all_off(led) && !led->adf_on)
 274                 bd2802_reset_cancel(led);
 275
 276         reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT1SETUP);
 277         bd2802_write_byte(led->client, reg, BD2802_CURRENT_000);
 278         reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT2SETUP);
 279         bd2802_write_byte(led->client, reg, led->rgb_current);
 280         reg = bd2802_get_reg_addr(id, color, BD2802_REG_WAVEPATTERN);
 281         bd2802_write_byte(led->client, reg, led->wave_pattern);
 282
 283         bd2802_enable(led, id);
 284         bd2802_update_state(led, id, color, BD2802_BLINK);
 285 }
 286
 287 static void bd2802_turn_on(struct bd2802_led *led, enum led_ids id,
 288                                 enum led_colors color, enum led_bits led_bit)
 289 {
 290         if (led_bit == BD2802_OFF) {
 291                 dev_err(&led->client->dev,
 292                                         "Only 'blink' and 'on' are allowed\n");
 293                 return;
 294         }
 295
 296         if (led_bit == BD2802_BLINK)
 297                 bd2802_set_blink(led, id, color);
 298         else
 299                 bd2802_set_on(led, id, color);
 300 }
 301
 302 static void bd2802_turn_off(struct bd2802_led *led, enum led_ids id,
 303                                                         enum led_colors color)
 304 {
 305         u8 reg;
 306
 307         if (bd2802_is_rgb_off(led, id, color))
 308                 return;
 309
 310         reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT1SETUP);
 311         bd2802_write_byte(led->client, reg, BD2802_CURRENT_000);
 312         reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT2SETUP);
 313         bd2802_write_byte(led->client, reg, BD2802_CURRENT_000);
 314
 315         bd2802_update_state(led, id, color, BD2802_OFF);
 316 }
 317
 318 #define BD2802_SET_REGISTER(reg_addr, reg_name)                         \
 319 static ssize_t bd2802_store_reg##reg_addr(struct device *dev,           \
 320         struct device_attribute *attr, const char *buf, size_t count)   \
 321 {                                                                       \
 322         struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\
 323         unsigned long val;                                              \
 324         int ret;                                                        \
 325         if (!count)                                                     \
 326                 return -EINVAL;                                         \
 327         ret = kstrtoul(buf, 16, &val);                                  \
 328         if (ret)                                                        \
 329                 return ret;                                             \
 330         down_write(&led->rwsem);                                        \
 331         bd2802_write_byte(led->client, reg_addr, (u8) val);             \
 332         up_write(&led->rwsem);                                          \
 333         return count;                                                   \
 334 }                                                                       \
 335 static struct device_attribute bd2802_reg##reg_addr##_attr = {          \
 336         .attr = {.name = reg_name, .mode = 0644},                       \
 337         .store = bd2802_store_reg##reg_addr,                            \
 338 };
 339
 340 BD2802_SET_REGISTER(0x00, "0x00");
 341 BD2802_SET_REGISTER(0x01, "0x01");
 342 BD2802_SET_REGISTER(0x02, "0x02");
 343 BD2802_SET_REGISTER(0x03, "0x03");
 344 BD2802_SET_REGISTER(0x04, "0x04");
 345 BD2802_SET_REGISTER(0x05, "0x05");
 346 BD2802_SET_REGISTER(0x06, "0x06");
 347 BD2802_SET_REGISTER(0x07, "0x07");
 348 BD2802_SET_REGISTER(0x08, "0x08");
 349 BD2802_SET_REGISTER(0x09, "0x09");
 350 BD2802_SET_REGISTER(0x0a, "0x0a");
 351 BD2802_SET_REGISTER(0x0b, "0x0b");
 352 BD2802_SET_REGISTER(0x0c, "0x0c");
 353 BD2802_SET_REGISTER(0x0d, "0x0d");
 354 BD2802_SET_REGISTER(0x0e, "0x0e");
 355 BD2802_SET_REGISTER(0x0f, "0x0f");
 356 BD2802_SET_REGISTER(0x10, "0x10");
 357 BD2802_SET_REGISTER(0x11, "0x11");
 358 BD2802_SET_REGISTER(0x12, "0x12");
 359 BD2802_SET_REGISTER(0x13, "0x13");
 360 BD2802_SET_REGISTER(0x14, "0x14");
 361 BD2802_SET_REGISTER(0x15, "0x15");
 362
 363 static struct device_attribute *bd2802_addr_attributes[] = {
 364         &bd2802_reg0x00_attr,
 365         &bd2802_reg0x01_attr,
 366         &bd2802_reg0x02_attr,
 367         &bd2802_reg0x03_attr,
 368         &bd2802_reg0x04_attr,
 369         &bd2802_reg0x05_attr,
 370         &bd2802_reg0x06_attr,
 371         &bd2802_reg0x07_attr,
 372         &bd2802_reg0x08_attr,
 373         &bd2802_reg0x09_attr,
 374         &bd2802_reg0x0a_attr,
 375         &bd2802_reg0x0b_attr,
 376         &bd2802_reg0x0c_attr,
 377         &bd2802_reg0x0d_attr,
 378         &bd2802_reg0x0e_attr,
 379         &bd2802_reg0x0f_attr,
 380         &bd2802_reg0x10_attr,
 381         &bd2802_reg0x11_attr,
 382         &bd2802_reg0x12_attr,
 383         &bd2802_reg0x13_attr,
 384         &bd2802_reg0x14_attr,
 385         &bd2802_reg0x15_attr,
 386 };
 387
 388 static void bd2802_enable_adv_conf(struct bd2802_led *led)
 389 {
 390         int i, ret;
 391
 392         for (i = 0; i < ARRAY_SIZE(bd2802_addr_attributes); i++) {
 393                 ret = device_create_file(&led->client->dev,
 394                                                 bd2802_addr_attributes[i]);
 395                 if (ret) {
 396                         dev_err(&led->client->dev, "failed: sysfs file %s\n",
 397                                         bd2802_addr_attributes[i]->attr.name);
 398                         goto failed_remove_files;
 399                 }
 400         }
 401
 402         if (bd2802_is_all_off(led))
 403                 bd2802_reset_cancel(led);
 404
 405         led->adf_on = 1;
 406
 407         return;
 408
 409 failed_remove_files:
 410         for (i--; i >= 0; i--)
 411                 device_remove_file(&led->client->dev,
 412                                                 bd2802_addr_attributes[i]);
 413 }
 414
 415 static void bd2802_disable_adv_conf(struct bd2802_led *led)
 416 {
 417         int i;
 418
 419         for (i = 0; i < ARRAY_SIZE(bd2802_addr_attributes); i++)
 420                 device_remove_file(&led->client->dev,
 421                                                 bd2802_addr_attributes[i]);
 422
 423         if (bd2802_is_all_off(led))
 424                 gpiod_set_value(led->reset, 1);
 425
 426         led->adf_on = 0;
 427 }
 428
 429 static ssize_t bd2802_show_adv_conf(struct device *dev,
 430         struct device_attribute *attr, char *buf)
 431 {
 432         struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));
 433         ssize_t ret;
 434
 435         down_read(&led->rwsem);
 436         if (led->adf_on)
 437                 ret = sprintf(buf, "on\n");
 438         else
 439                 ret = sprintf(buf, "off\n");
 440         up_read(&led->rwsem);
 441
 442         return ret;
 443 }
 444
 445 static ssize_t bd2802_store_adv_conf(struct device *dev,
 446         struct device_attribute *attr, const char *buf, size_t count)
 447 {
 448         struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));
 449
 450         if (!count)
 451                 return -EINVAL;
 452
 453         down_write(&led->rwsem);
 454         if (!led->adf_on && !strncmp(buf, "on", 2))
 455                 bd2802_enable_adv_conf(led);
 456         else if (led->adf_on && !strncmp(buf, "off", 3))
 457                 bd2802_disable_adv_conf(led);
 458         up_write(&led->rwsem);
 459
 460         return count;
 461 }
 462
 463 static struct device_attribute bd2802_adv_conf_attr = {
 464         .attr = {
 465                 .name = "advanced_configuration",
 466                 .mode = 0644,
 467         },
 468         .show = bd2802_show_adv_conf,
 469         .store = bd2802_store_adv_conf,
 470 };
 471
 472 #define BD2802_CONTROL_ATTR(attr_name, name_str)                        \
 473 static ssize_t bd2802_show_##attr_name(struct device *dev,              \
 474         struct device_attribute *attr, char *buf)                       \
 475 {                                                                       \
 476         struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\
 477         ssize_t ret;                                                    \
 478         down_read(&led->rwsem);                                         \
 479         ret = sprintf(buf, "0x%02x\n", led->attr_name);                 \
 480         up_read(&led->rwsem);                                           \
 481         return ret;                                                     \
 482 }                                                                       \
 483 static ssize_t bd2802_store_##attr_name(struct device *dev,             \
 484         struct device_attribute *attr, const char *buf, size_t count)   \
 485 {                                                                       \
 486         struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\
 487         unsigned long val;                                              \
 488         int ret;                                                        \
 489         if (!count)                                                     \
 490                 return -EINVAL;                                         \
 491         ret = kstrtoul(buf, 16, &val);                                  \
 492         if (ret)                                                        \
 493                 return ret;                                             \
 494         down_write(&led->rwsem);                                        \
 495         led->attr_name = val;                                           \
 496         up_write(&led->rwsem);                                          \
 497         return count;                                                   \
 498 }                                                                       \
 499 static struct device_attribute bd2802_##attr_name##_attr = {            \
 500         .attr = {                                                       \
 501                 .name = name_str,                                       \
 502                 .mode = 0644,                                           \
 503         },                                                              \
 504         .show = bd2802_show_##attr_name,                                \
 505         .store = bd2802_store_##attr_name,                              \
 506 };
 507
 508 BD2802_CONTROL_ATTR(wave_pattern, "wave_pattern");
 509 BD2802_CONTROL_ATTR(rgb_current, "rgb_current");
 510
 511 static struct device_attribute *bd2802_attributes[] = {
 512         &bd2802_adv_conf_attr,
 513         &bd2802_wave_pattern_attr,
 514         &bd2802_rgb_current_attr,
 515 };
 516
 517 #define BD2802_CONTROL_RGBS(name, id, clr)                              \
 518 static int bd2802_set_##name##_brightness(struct led_classdev *led_cdev,\
 519                                         enum led_brightness value)      \
 520 {                                                                       \
 521         struct bd2802_led *led =                                        \
 522                 container_of(led_cdev, struct bd2802_led, cdev_##name); \
 523         led->led_id = id;                                               \
 524         led->color = clr;                                               \
 525         if (value == LED_OFF) {                                         \
 526                 led->state = BD2802_OFF;                                \
 527                 bd2802_turn_off(led, led->led_id, led->color);          \
 528         } else {                                                        \
 529                 led->state = BD2802_ON;                                 \
 530                 bd2802_turn_on(led, led->led_id, led->color, BD2802_ON);\
 531         }                                                               \
 532         return 0;                                                       \
 533 }                                                                       \
 534 static int bd2802_set_##name##_blink(struct led_classdev *led_cdev,     \
 535                 unsigned long *delay_on, unsigned long *delay_off)      \
 536 {                                                                       \
 537         struct bd2802_led *led =                                        \
 538                 container_of(led_cdev, struct bd2802_led, cdev_##name); \
 539         if (*delay_on == 0 || *delay_off == 0)                          \
 540                 return -EINVAL;                                         \
 541         led->led_id = id;                                               \
 542         led->color = clr;                                               \
 543         led->state = BD2802_BLINK;                                      \
 544         bd2802_turn_on(led, led->led_id, led->color, BD2802_BLINK);     \
 545         return 0;                                                       \
 546 }
 547
 548 BD2802_CONTROL_RGBS(led1r, LED1, RED);
 549 BD2802_CONTROL_RGBS(led1g, LED1, GREEN);
 550 BD2802_CONTROL_RGBS(led1b, LED1, BLUE);
 551 BD2802_CONTROL_RGBS(led2r, LED2, RED);
 552 BD2802_CONTROL_RGBS(led2g, LED2, GREEN);
 553 BD2802_CONTROL_RGBS(led2b, LED2, BLUE);
 554
 555 static int bd2802_register_led_classdev(struct bd2802_led *led)
 556 {
 557         int ret;
 558
 559         led->cdev_led1r.name = "led1_R";
 560         led->cdev_led1r.brightness = LED_OFF;
 561         led->cdev_led1r.brightness_set_blocking = bd2802_set_led1r_brightness;
 562         led->cdev_led1r.blink_set = bd2802_set_led1r_blink;
 563
 564         ret = led_classdev_register(&led->client->dev, &led->cdev_led1r);
 565         if (ret < 0) {
 566                 dev_err(&led->client->dev, "couldn't register LED %s\n",
 567                                                         led->cdev_led1r.name);
 568                 goto failed_unregister_led1_R;
 569         }
 570
 571         led->cdev_led1g.name = "led1_G";
 572         led->cdev_led1g.brightness = LED_OFF;
 573         led->cdev_led1g.brightness_set_blocking = bd2802_set_led1g_brightness;
 574         led->cdev_led1g.blink_set = bd2802_set_led1g_blink;
 575
 576         ret = led_classdev_register(&led->client->dev, &led->cdev_led1g);
 577         if (ret < 0) {
 578                 dev_err(&led->client->dev, "couldn't register LED %s\n",
 579                                                         led->cdev_led1g.name);
 580                 goto failed_unregister_led1_G;
 581         }
 582
 583         led->cdev_led1b.name = "led1_B";
 584         led->cdev_led1b.brightness = LED_OFF;
 585         led->cdev_led1b.brightness_set_blocking = bd2802_set_led1b_brightness;
 586         led->cdev_led1b.blink_set = bd2802_set_led1b_blink;
 587
 588         ret = led_classdev_register(&led->client->dev, &led->cdev_led1b);
 589         if (ret < 0) {
 590                 dev_err(&led->client->dev, "couldn't register LED %s\n",
 591                                                         led->cdev_led1b.name);
 592                 goto failed_unregister_led1_B;
 593         }
 594
 595         led->cdev_led2r.name = "led2_R";
 596         led->cdev_led2r.brightness = LED_OFF;
 597         led->cdev_led2r.brightness_set_blocking = bd2802_set_led2r_brightness;
 598         led->cdev_led2r.blink_set = bd2802_set_led2r_blink;
 599
 600         ret = led_classdev_register(&led->client->dev, &led->cdev_led2r);
 601         if (ret < 0) {
 602                 dev_err(&led->client->dev, "couldn't register LED %s\n",
 603                                                         led->cdev_led2r.name);
 604                 goto failed_unregister_led2_R;
 605         }
 606
 607         led->cdev_led2g.name = "led2_G";
 608         led->cdev_led2g.brightness = LED_OFF;
 609         led->cdev_led2g.brightness_set_blocking = bd2802_set_led2g_brightness;
 610         led->cdev_led2g.blink_set = bd2802_set_led2g_blink;
 611
 612         ret = led_classdev_register(&led->client->dev, &led->cdev_led2g);
 613         if (ret < 0) {
 614                 dev_err(&led->client->dev, "couldn't register LED %s\n",
 615                                                         led->cdev_led2g.name);
 616                 goto failed_unregister_led2_G;
 617         }
 618
 619         led->cdev_led2b.name = "led2_B";
 620         led->cdev_led2b.brightness = LED_OFF;
 621         led->cdev_led2b.brightness_set_blocking = bd2802_set_led2b_brightness;
 622         led->cdev_led2b.blink_set = bd2802_set_led2b_blink;
 623         led->cdev_led2b.flags |= LED_CORE_SUSPENDRESUME;
 624
 625         ret = led_classdev_register(&led->client->dev, &led->cdev_led2b);
 626         if (ret < 0) {
 627                 dev_err(&led->client->dev, "couldn't register LED %s\n",
 628                                                         led->cdev_led2b.name);
 629                 goto failed_unregister_led2_B;
 630         }
 631
 632         return 0;
 633
 634 failed_unregister_led2_B:
 635         led_classdev_unregister(&led->cdev_led2g);
 636 failed_unregister_led2_G:
 637         led_classdev_unregister(&led->cdev_led2r);
 638 failed_unregister_led2_R:
 639         led_classdev_unregister(&led->cdev_led1b);
 640 failed_unregister_led1_B:
 641         led_classdev_unregister(&led->cdev_led1g);
 642 failed_unregister_led1_G:
 643         led_classdev_unregister(&led->cdev_led1r);
 644 failed_unregister_led1_R:
 645
 646         return ret;
 647 }
 648
 649 static void bd2802_unregister_led_classdev(struct bd2802_led *led)
 650 {
 651         led_classdev_unregister(&led->cdev_led2b);
 652         led_classdev_unregister(&led->cdev_led2g);
 653         led_classdev_unregister(&led->cdev_led2r);
 654         led_classdev_unregister(&led->cdev_led1b);
 655         led_classdev_unregister(&led->cdev_led1g);
 656         led_classdev_unregister(&led->cdev_led1r);
 657 }
 658
 659 static int bd2802_probe(struct i2c_client *client,
 660                         const struct i2c_device_id *id)
 661 {
 662         struct bd2802_led *led;
 663         int ret, i;
 664
 665         led = devm_kzalloc(&client->dev, sizeof(struct bd2802_led), GFP_KERNEL);
 666         if (!led)
 667                 return -ENOMEM;
 668
 669         led->client = client;
 670         i2c_set_clientdata(client, led);
 671
 672         /*
 673          * Configure RESET GPIO (L: RESET, H: RESET cancel)
 674          *
 675          * We request the reset GPIO as OUT_LOW which means de-asserted,
 676          * board files specifying this GPIO line in a machine descriptor
 677          * table should take care to specify GPIO_ACTIVE_LOW for this line.
 678          */
 679         led->reset = devm_gpiod_get(&client->dev, "reset", GPIOD_OUT_LOW);
 680         if (IS_ERR(led->reset))
 681                 return PTR_ERR(led->reset);
 682
 683         /* Tacss = min 0.1ms */
 684         udelay(100);
 685
 686         /* Detect BD2802GU */
 687         ret = bd2802_write_byte(client, BD2802_REG_CLKSETUP, 0x00);
 688         if (ret < 0) {
 689                 dev_err(&client->dev, "failed to detect device\n");
 690                 return ret;
 691         } else
 692                 dev_info(&client->dev, "return 0x%02x\n", ret);
 693
 694         /* To save the power, reset BD2802 after detecting */
 695         gpiod_set_value(led->reset, 1);
 696
 697         /* Default attributes */
 698         led->wave_pattern = BD2802_PATTERN_HALF;
 699         led->rgb_current = BD2802_CURRENT_032;
 700
 701         init_rwsem(&led->rwsem);
 702
 703         for (i = 0; i < ARRAY_SIZE(bd2802_attributes); i++) {
 704                 ret = device_create_file(&led->client->dev,
 705                                                 bd2802_attributes[i]);
 706                 if (ret) {
 707                         dev_err(&led->client->dev, "failed: sysfs file %s\n",
 708                                         bd2802_attributes[i]->attr.name);
 709                         goto failed_unregister_dev_file;
 710                 }
 711         }
 712
 713         ret = bd2802_register_led_classdev(led);
 714         if (ret < 0)
 715                 goto failed_unregister_dev_file;
 716
 717         return 0;
 718
 719 failed_unregister_dev_file:
 720         for (i--; i >= 0; i--)
 721                 device_remove_file(&led->client->dev, bd2802_attributes[i]);
 722         return ret;
 723 }
 724
 725 static int bd2802_remove(struct i2c_client *client)
 726 {
 727         struct bd2802_led *led = i2c_get_clientdata(client);
 728         int i;
 729
 730         gpiod_set_value(led->reset, 1);
 731         bd2802_unregister_led_classdev(led);
 732         if (led->adf_on)
 733                 bd2802_disable_adv_conf(led);
 734         for (i = 0; i < ARRAY_SIZE(bd2802_attributes); i++)
 735                 device_remove_file(&led->client->dev, bd2802_attributes[i]);
 736
 737         return 0;
 738 }
 739
 740 #ifdef CONFIG_PM_SLEEP
 741 static void bd2802_restore_state(struct bd2802_led *led)
 742 {
 743         int i;
 744
 745         for (i = 0; i < LED_NUM; i++) {
 746                 if (led->led[i].r)
 747                         bd2802_turn_on(led, i, RED, led->led[i].r);
 748                 if (led->led[i].g)
 749                         bd2802_turn_on(led, i, GREEN, led->led[i].g);
 750                 if (led->led[i].b)
 751                         bd2802_turn_on(led, i, BLUE, led->led[i].b);
 752         }
 753 }
 754
 755 static int bd2802_suspend(struct device *dev)
 756 {
 757         struct i2c_client *client = to_i2c_client(dev);
 758         struct bd2802_led *led = i2c_get_clientdata(client);
 759
 760         gpiod_set_value(led->reset, 1);
 761
 762         return 0;
 763 }
 764
 765 static int bd2802_resume(struct device *dev)
 766 {
 767         struct i2c_client *client = to_i2c_client(dev);
 768         struct bd2802_led *led = i2c_get_clientdata(client);
 769
 770         if (!bd2802_is_all_off(led) || led->adf_on) {
 771                 bd2802_reset_cancel(led);
 772                 bd2802_restore_state(led);
 773         }
 774
 775         return 0;
 776 }
 777 #endif
 778
 779 static SIMPLE_DEV_PM_OPS(bd2802_pm, bd2802_suspend, bd2802_resume);
 780
 781 static const struct i2c_device_id bd2802_id[] = {
 782         { "BD2802", 0 },
 783         { }
 784 };
 785 MODULE_DEVICE_TABLE(i2c, bd2802_id);
 786
 787 static struct i2c_driver bd2802_i2c_driver = {
 788         .driver = {
 789                 .name   = "BD2802",
 790                 .pm     = &bd2802_pm,
 791         },
 792         .probe          = bd2802_probe,
 793         .remove         = bd2802_remove,
 794         .id_table       = bd2802_id,
 795 };
 796
 797 module_i2c_driver(bd2802_i2c_driver);
 798
 799 MODULE_AUTHOR("Kim Kyuwon <q1.kim@samsung.com>");
 800 MODULE_DESCRIPTION("BD2802 LED driver");
 801 MODULE_LICENSE("GPL v2");