799 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * leds-bd2802.c - RGB LED Driver4 *5 * Copyright (C) 2009 Samsung Electronics6 * Kim Kyuwon <q1.kim@samsung.com>7 *8 * Datasheet: http://www.rohm.com/products/databook/driver/pdf/bd2802gu-e.pdf9 */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 0xa23#define BD2802_COLOR_OFFSET 0x324 25#define BD2802_REG_CLKSETUP 0x0026#define BD2802_REG_CONTROL 0x0127#define BD2802_REG_HOURSETUP 0x0228#define BD2802_REG_CURRENT1SETUP 0x0329#define BD2802_REG_CURRENT2SETUP 0x0430#define BD2802_REG_WAVEPATTERN 0x0531 32#define BD2802_CURRENT_032 0x10 /* 3.2mA */33#define BD2802_CURRENT_000 0x00 /* 0.0mA */34 35#define BD2802_PATTERN_FULL 0x0736#define BD2802_PATTERN_HALF 0x0337 38enum led_ids {39 LED1,40 LED2,41 LED_NUM,42};43 44enum led_colors {45 RED,46 GREEN,47 BLUE,48};49 50enum 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 */61struct led_state {62 unsigned r:2;63 unsigned g:2;64 unsigned b:2;65};66 67struct 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 array77 * members prevent using 'container_of' macro. So repetitive works78 * 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 108static 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 124static 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 132static 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 143static 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 148static 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 159static 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 171static 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 turned210 * off. So set RGB LED Control register to stop the current RGB LED211 */212 value = (id == LED1) ? LED_CTL(1, 0) : LED_CTL(0, 1);213 bd2802_write_byte(led->client, BD2802_REG_CONTROL, value);214}215 216static 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 228static 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 235static 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 else244 value = LED_CTL(1 , other_led_on);245 246 bd2802_write_byte(led->client, BD2802_REG_CONTROL, value);247}248 249static 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 268static 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 287static 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 else299 bd2802_set_on(led, id, color);300}301 302static 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) \319static 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} \335static struct device_attribute bd2802_reg##reg_addr##_attr = { \336 .attr = {.name = reg_name, .mode = 0644}, \337 .store = bd2802_store_reg##reg_addr, \338};339 340BD2802_SET_REGISTER(0x00, "0x00");341BD2802_SET_REGISTER(0x01, "0x01");342BD2802_SET_REGISTER(0x02, "0x02");343BD2802_SET_REGISTER(0x03, "0x03");344BD2802_SET_REGISTER(0x04, "0x04");345BD2802_SET_REGISTER(0x05, "0x05");346BD2802_SET_REGISTER(0x06, "0x06");347BD2802_SET_REGISTER(0x07, "0x07");348BD2802_SET_REGISTER(0x08, "0x08");349BD2802_SET_REGISTER(0x09, "0x09");350BD2802_SET_REGISTER(0x0a, "0x0a");351BD2802_SET_REGISTER(0x0b, "0x0b");352BD2802_SET_REGISTER(0x0c, "0x0c");353BD2802_SET_REGISTER(0x0d, "0x0d");354BD2802_SET_REGISTER(0x0e, "0x0e");355BD2802_SET_REGISTER(0x0f, "0x0f");356BD2802_SET_REGISTER(0x10, "0x10");357BD2802_SET_REGISTER(0x11, "0x11");358BD2802_SET_REGISTER(0x12, "0x12");359BD2802_SET_REGISTER(0x13, "0x13");360BD2802_SET_REGISTER(0x14, "0x14");361BD2802_SET_REGISTER(0x15, "0x15");362 363static 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 388static 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 409failed_remove_files:410 for (i--; i >= 0; i--)411 device_remove_file(&led->client->dev,412 bd2802_addr_attributes[i]);413}414 415static 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 429static 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 else439 ret = sprintf(buf, "off\n");440 up_read(&led->rwsem);441 442 return ret;443}444 445static 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 463static 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) \473static 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} \483static 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} \499static 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 508BD2802_CONTROL_ATTR(wave_pattern, "wave_pattern");509BD2802_CONTROL_ATTR(rgb_current, "rgb_current");510 511static 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) \518static 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} \534static 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 548BD2802_CONTROL_RGBS(led1r, LED1, RED);549BD2802_CONTROL_RGBS(led1g, LED1, GREEN);550BD2802_CONTROL_RGBS(led1b, LED1, BLUE);551BD2802_CONTROL_RGBS(led2r, LED2, RED);552BD2802_CONTROL_RGBS(led2g, LED2, GREEN);553BD2802_CONTROL_RGBS(led2b, LED2, BLUE);554 555static 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 634failed_unregister_led2_B:635 led_classdev_unregister(&led->cdev_led2g);636failed_unregister_led2_G:637 led_classdev_unregister(&led->cdev_led2r);638failed_unregister_led2_R:639 led_classdev_unregister(&led->cdev_led1b);640failed_unregister_led1_B:641 led_classdev_unregister(&led->cdev_led1g);642failed_unregister_led1_G:643 led_classdev_unregister(&led->cdev_led1r);644failed_unregister_led1_R:645 646 return ret;647}648 649static 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 659static int bd2802_probe(struct i2c_client *client)660{661 struct bd2802_led *led;662 int ret, i;663 664 led = devm_kzalloc(&client->dev, sizeof(struct bd2802_led), GFP_KERNEL);665 if (!led)666 return -ENOMEM;667 668 led->client = client;669 i2c_set_clientdata(client, led);670 671 /*672 * Configure RESET GPIO (L: RESET, H: RESET cancel)673 *674 * We request the reset GPIO as OUT_LOW which means de-asserted,675 * board files specifying this GPIO line in a machine descriptor676 * table should take care to specify GPIO_ACTIVE_LOW for this line.677 */678 led->reset = devm_gpiod_get(&client->dev, "reset", GPIOD_OUT_LOW);679 if (IS_ERR(led->reset))680 return PTR_ERR(led->reset);681 682 /* Tacss = min 0.1ms */683 udelay(100);684 685 /* Detect BD2802GU */686 ret = bd2802_write_byte(client, BD2802_REG_CLKSETUP, 0x00);687 if (ret < 0) {688 dev_err(&client->dev, "failed to detect device\n");689 return ret;690 } else691 dev_info(&client->dev, "return 0x%02x\n", ret);692 693 /* To save the power, reset BD2802 after detecting */694 gpiod_set_value(led->reset, 1);695 696 /* Default attributes */697 led->wave_pattern = BD2802_PATTERN_HALF;698 led->rgb_current = BD2802_CURRENT_032;699 700 init_rwsem(&led->rwsem);701 702 for (i = 0; i < ARRAY_SIZE(bd2802_attributes); i++) {703 ret = device_create_file(&led->client->dev,704 bd2802_attributes[i]);705 if (ret) {706 dev_err(&led->client->dev, "failed: sysfs file %s\n",707 bd2802_attributes[i]->attr.name);708 goto failed_unregister_dev_file;709 }710 }711 712 ret = bd2802_register_led_classdev(led);713 if (ret < 0)714 goto failed_unregister_dev_file;715 716 return 0;717 718failed_unregister_dev_file:719 for (i--; i >= 0; i--)720 device_remove_file(&led->client->dev, bd2802_attributes[i]);721 return ret;722}723 724static void bd2802_remove(struct i2c_client *client)725{726 struct bd2802_led *led = i2c_get_clientdata(client);727 int i;728 729 gpiod_set_value(led->reset, 1);730 bd2802_unregister_led_classdev(led);731 if (led->adf_on)732 bd2802_disable_adv_conf(led);733 for (i = 0; i < ARRAY_SIZE(bd2802_attributes); i++)734 device_remove_file(&led->client->dev, bd2802_attributes[i]);735}736 737#ifdef CONFIG_PM_SLEEP738static void bd2802_restore_state(struct bd2802_led *led)739{740 int i;741 742 for (i = 0; i < LED_NUM; i++) {743 if (led->led[i].r)744 bd2802_turn_on(led, i, RED, led->led[i].r);745 if (led->led[i].g)746 bd2802_turn_on(led, i, GREEN, led->led[i].g);747 if (led->led[i].b)748 bd2802_turn_on(led, i, BLUE, led->led[i].b);749 }750}751 752static int bd2802_suspend(struct device *dev)753{754 struct i2c_client *client = to_i2c_client(dev);755 struct bd2802_led *led = i2c_get_clientdata(client);756 757 gpiod_set_value(led->reset, 1);758 759 return 0;760}761 762static int bd2802_resume(struct device *dev)763{764 struct i2c_client *client = to_i2c_client(dev);765 struct bd2802_led *led = i2c_get_clientdata(client);766 767 if (!bd2802_is_all_off(led) || led->adf_on) {768 bd2802_reset_cancel(led);769 bd2802_restore_state(led);770 }771 772 return 0;773}774#endif775 776static SIMPLE_DEV_PM_OPS(bd2802_pm, bd2802_suspend, bd2802_resume);777 778static const struct i2c_device_id bd2802_id[] = {779 { "BD2802" },780 { }781};782MODULE_DEVICE_TABLE(i2c, bd2802_id);783 784static struct i2c_driver bd2802_i2c_driver = {785 .driver = {786 .name = "BD2802",787 .pm = &bd2802_pm,788 },789 .probe = bd2802_probe,790 .remove = bd2802_remove,791 .id_table = bd2802_id,792};793 794module_i2c_driver(bd2802_i2c_driver);795 796MODULE_AUTHOR("Kim Kyuwon <q1.kim@samsung.com>");797MODULE_DESCRIPTION("BD2802 LED driver");798MODULE_LICENSE("GPL v2");799