xref: /openbmc/linux/drivers/leds/leds-bd2802.c (revision b830f94f)
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.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 rw_semaphore		rwsem;
71 
72 	struct led_state		led[2];
73 
74 	/*
75 	 * Making led_classdev as array is not recommended, because array
76 	 * members prevent using 'container_of' macro. So repetitive works
77 	 * are needed.
78 	 */
79 	struct led_classdev		cdev_led1r;
80 	struct led_classdev		cdev_led1g;
81 	struct led_classdev		cdev_led1b;
82 	struct led_classdev		cdev_led2r;
83 	struct led_classdev		cdev_led2g;
84 	struct led_classdev		cdev_led2b;
85 
86 	/*
87 	 * Advanced Configuration Function(ADF) mode:
88 	 * In ADF mode, user can set registers of BD2802GU directly,
89 	 * therefore BD2802GU doesn't enter reset state.
90 	 */
91 	int				adf_on;
92 
93 	enum led_ids			led_id;
94 	enum led_colors			color;
95 	enum led_bits			state;
96 
97 	/* General attributes of RGB LEDs */
98 	int				wave_pattern;
99 	int				rgb_current;
100 };
101 
102 
103 /*--------------------------------------------------------------*/
104 /*	BD2802GU helper functions					*/
105 /*--------------------------------------------------------------*/
106 
107 static inline int bd2802_is_rgb_off(struct bd2802_led *led, enum led_ids id,
108 							enum led_colors color)
109 {
110 	switch (color) {
111 	case RED:
112 		return !led->led[id].r;
113 	case GREEN:
114 		return !led->led[id].g;
115 	case BLUE:
116 		return !led->led[id].b;
117 	default:
118 		dev_err(&led->client->dev, "%s: Invalid color\n", __func__);
119 		return -EINVAL;
120 	}
121 }
122 
123 static inline int bd2802_is_led_off(struct bd2802_led *led, enum led_ids id)
124 {
125 	if (led->led[id].r || led->led[id].g || led->led[id].b)
126 		return 0;
127 
128 	return 1;
129 }
130 
131 static inline int bd2802_is_all_off(struct bd2802_led *led)
132 {
133 	int i;
134 
135 	for (i = 0; i < LED_NUM; i++)
136 		if (!bd2802_is_led_off(led, i))
137 			return 0;
138 
139 	return 1;
140 }
141 
142 static inline u8 bd2802_get_base_offset(enum led_ids id, enum led_colors color)
143 {
144 	return id * BD2802_LED_OFFSET + color * BD2802_COLOR_OFFSET;
145 }
146 
147 static inline u8 bd2802_get_reg_addr(enum led_ids id, enum led_colors color,
148 								u8 reg_offset)
149 {
150 	return reg_offset + bd2802_get_base_offset(id, color);
151 }
152 
153 
154 /*--------------------------------------------------------------*/
155 /*	BD2802GU core functions					*/
156 /*--------------------------------------------------------------*/
157 
158 static int bd2802_write_byte(struct i2c_client *client, u8 reg, u8 val)
159 {
160 	int ret = i2c_smbus_write_byte_data(client, reg, val);
161 	if (ret >= 0)
162 		return 0;
163 
164 	dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n",
165 						__func__, reg, val, ret);
166 
167 	return ret;
168 }
169 
170 static void bd2802_update_state(struct bd2802_led *led, enum led_ids id,
171 				enum led_colors color, enum led_bits led_bit)
172 {
173 	int i;
174 	u8 value;
175 
176 	for (i = 0; i < LED_NUM; i++) {
177 		if (i == id) {
178 			switch (color) {
179 			case RED:
180 				led->led[i].r = led_bit;
181 				break;
182 			case GREEN:
183 				led->led[i].g = led_bit;
184 				break;
185 			case BLUE:
186 				led->led[i].b = led_bit;
187 				break;
188 			default:
189 				dev_err(&led->client->dev,
190 					"%s: Invalid color\n", __func__);
191 				return;
192 			}
193 		}
194 	}
195 
196 	if (led_bit == BD2802_BLINK || led_bit == BD2802_ON)
197 		return;
198 
199 	if (!bd2802_is_led_off(led, id))
200 		return;
201 
202 	if (bd2802_is_all_off(led) && !led->adf_on) {
203 		gpio_set_value(led->pdata->reset_gpio, 0);
204 		return;
205 	}
206 
207 	/*
208 	 * In this case, other led is turned on, and current led is turned
209 	 * off. So set RGB LED Control register to stop the current RGB LED
210 	 */
211 	value = (id == LED1) ? LED_CTL(1, 0) : LED_CTL(0, 1);
212 	bd2802_write_byte(led->client, BD2802_REG_CONTROL, value);
213 }
214 
215 static void bd2802_configure(struct bd2802_led *led)
216 {
217 	struct bd2802_led_platform_data *pdata = led->pdata;
218 	u8 reg;
219 
220 	reg = bd2802_get_reg_addr(LED1, RED, BD2802_REG_HOURSETUP);
221 	bd2802_write_byte(led->client, reg, pdata->rgb_time);
222 
223 	reg = bd2802_get_reg_addr(LED2, RED, BD2802_REG_HOURSETUP);
224 	bd2802_write_byte(led->client, reg, pdata->rgb_time);
225 }
226 
227 static void bd2802_reset_cancel(struct bd2802_led *led)
228 {
229 	gpio_set_value(led->pdata->reset_gpio, 1);
230 	udelay(100);
231 	bd2802_configure(led);
232 }
233 
234 static void bd2802_enable(struct bd2802_led *led, enum led_ids id)
235 {
236 	enum led_ids other_led = (id == LED1) ? LED2 : LED1;
237 	u8 value, other_led_on;
238 
239 	other_led_on = !bd2802_is_led_off(led, other_led);
240 	if (id == LED1)
241 		value = LED_CTL(other_led_on, 1);
242 	else
243 		value = LED_CTL(1 , other_led_on);
244 
245 	bd2802_write_byte(led->client, BD2802_REG_CONTROL, value);
246 }
247 
248 static void bd2802_set_on(struct bd2802_led *led, enum led_ids id,
249 							enum led_colors color)
250 {
251 	u8 reg;
252 
253 	if (bd2802_is_all_off(led) && !led->adf_on)
254 		bd2802_reset_cancel(led);
255 
256 	reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT1SETUP);
257 	bd2802_write_byte(led->client, reg, led->rgb_current);
258 	reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT2SETUP);
259 	bd2802_write_byte(led->client, reg, BD2802_CURRENT_000);
260 	reg = bd2802_get_reg_addr(id, color, BD2802_REG_WAVEPATTERN);
261 	bd2802_write_byte(led->client, reg, BD2802_PATTERN_FULL);
262 
263 	bd2802_enable(led, id);
264 	bd2802_update_state(led, id, color, BD2802_ON);
265 }
266 
267 static void bd2802_set_blink(struct bd2802_led *led, enum led_ids id,
268 							enum led_colors color)
269 {
270 	u8 reg;
271 
272 	if (bd2802_is_all_off(led) && !led->adf_on)
273 		bd2802_reset_cancel(led);
274 
275 	reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT1SETUP);
276 	bd2802_write_byte(led->client, reg, BD2802_CURRENT_000);
277 	reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT2SETUP);
278 	bd2802_write_byte(led->client, reg, led->rgb_current);
279 	reg = bd2802_get_reg_addr(id, color, BD2802_REG_WAVEPATTERN);
280 	bd2802_write_byte(led->client, reg, led->wave_pattern);
281 
282 	bd2802_enable(led, id);
283 	bd2802_update_state(led, id, color, BD2802_BLINK);
284 }
285 
286 static void bd2802_turn_on(struct bd2802_led *led, enum led_ids id,
287 				enum led_colors color, enum led_bits led_bit)
288 {
289 	if (led_bit == BD2802_OFF) {
290 		dev_err(&led->client->dev,
291 					"Only 'blink' and 'on' are allowed\n");
292 		return;
293 	}
294 
295 	if (led_bit == BD2802_BLINK)
296 		bd2802_set_blink(led, id, color);
297 	else
298 		bd2802_set_on(led, id, color);
299 }
300 
301 static void bd2802_turn_off(struct bd2802_led *led, enum led_ids id,
302 							enum led_colors color)
303 {
304 	u8 reg;
305 
306 	if (bd2802_is_rgb_off(led, id, color))
307 		return;
308 
309 	reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT1SETUP);
310 	bd2802_write_byte(led->client, reg, BD2802_CURRENT_000);
311 	reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT2SETUP);
312 	bd2802_write_byte(led->client, reg, BD2802_CURRENT_000);
313 
314 	bd2802_update_state(led, id, color, BD2802_OFF);
315 }
316 
317 #define BD2802_SET_REGISTER(reg_addr, reg_name)				\
318 static ssize_t bd2802_store_reg##reg_addr(struct device *dev,		\
319 	struct device_attribute *attr, const char *buf, size_t count)	\
320 {									\
321 	struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\
322 	unsigned long val;						\
323 	int ret;							\
324 	if (!count)							\
325 		return -EINVAL;						\
326 	ret = kstrtoul(buf, 16, &val);					\
327 	if (ret)							\
328 		return ret;						\
329 	down_write(&led->rwsem);					\
330 	bd2802_write_byte(led->client, reg_addr, (u8) val);		\
331 	up_write(&led->rwsem);						\
332 	return count;							\
333 }									\
334 static struct device_attribute bd2802_reg##reg_addr##_attr = {		\
335 	.attr = {.name = reg_name, .mode = 0644},			\
336 	.store = bd2802_store_reg##reg_addr,				\
337 };
338 
339 BD2802_SET_REGISTER(0x00, "0x00");
340 BD2802_SET_REGISTER(0x01, "0x01");
341 BD2802_SET_REGISTER(0x02, "0x02");
342 BD2802_SET_REGISTER(0x03, "0x03");
343 BD2802_SET_REGISTER(0x04, "0x04");
344 BD2802_SET_REGISTER(0x05, "0x05");
345 BD2802_SET_REGISTER(0x06, "0x06");
346 BD2802_SET_REGISTER(0x07, "0x07");
347 BD2802_SET_REGISTER(0x08, "0x08");
348 BD2802_SET_REGISTER(0x09, "0x09");
349 BD2802_SET_REGISTER(0x0a, "0x0a");
350 BD2802_SET_REGISTER(0x0b, "0x0b");
351 BD2802_SET_REGISTER(0x0c, "0x0c");
352 BD2802_SET_REGISTER(0x0d, "0x0d");
353 BD2802_SET_REGISTER(0x0e, "0x0e");
354 BD2802_SET_REGISTER(0x0f, "0x0f");
355 BD2802_SET_REGISTER(0x10, "0x10");
356 BD2802_SET_REGISTER(0x11, "0x11");
357 BD2802_SET_REGISTER(0x12, "0x12");
358 BD2802_SET_REGISTER(0x13, "0x13");
359 BD2802_SET_REGISTER(0x14, "0x14");
360 BD2802_SET_REGISTER(0x15, "0x15");
361 
362 static struct device_attribute *bd2802_addr_attributes[] = {
363 	&bd2802_reg0x00_attr,
364 	&bd2802_reg0x01_attr,
365 	&bd2802_reg0x02_attr,
366 	&bd2802_reg0x03_attr,
367 	&bd2802_reg0x04_attr,
368 	&bd2802_reg0x05_attr,
369 	&bd2802_reg0x06_attr,
370 	&bd2802_reg0x07_attr,
371 	&bd2802_reg0x08_attr,
372 	&bd2802_reg0x09_attr,
373 	&bd2802_reg0x0a_attr,
374 	&bd2802_reg0x0b_attr,
375 	&bd2802_reg0x0c_attr,
376 	&bd2802_reg0x0d_attr,
377 	&bd2802_reg0x0e_attr,
378 	&bd2802_reg0x0f_attr,
379 	&bd2802_reg0x10_attr,
380 	&bd2802_reg0x11_attr,
381 	&bd2802_reg0x12_attr,
382 	&bd2802_reg0x13_attr,
383 	&bd2802_reg0x14_attr,
384 	&bd2802_reg0x15_attr,
385 };
386 
387 static void bd2802_enable_adv_conf(struct bd2802_led *led)
388 {
389 	int i, ret;
390 
391 	for (i = 0; i < ARRAY_SIZE(bd2802_addr_attributes); i++) {
392 		ret = device_create_file(&led->client->dev,
393 						bd2802_addr_attributes[i]);
394 		if (ret) {
395 			dev_err(&led->client->dev, "failed: sysfs file %s\n",
396 					bd2802_addr_attributes[i]->attr.name);
397 			goto failed_remove_files;
398 		}
399 	}
400 
401 	if (bd2802_is_all_off(led))
402 		bd2802_reset_cancel(led);
403 
404 	led->adf_on = 1;
405 
406 	return;
407 
408 failed_remove_files:
409 	for (i--; i >= 0; i--)
410 		device_remove_file(&led->client->dev,
411 						bd2802_addr_attributes[i]);
412 }
413 
414 static void bd2802_disable_adv_conf(struct bd2802_led *led)
415 {
416 	int i;
417 
418 	for (i = 0; i < ARRAY_SIZE(bd2802_addr_attributes); i++)
419 		device_remove_file(&led->client->dev,
420 						bd2802_addr_attributes[i]);
421 
422 	if (bd2802_is_all_off(led))
423 		gpio_set_value(led->pdata->reset_gpio, 0);
424 
425 	led->adf_on = 0;
426 }
427 
428 static ssize_t bd2802_show_adv_conf(struct device *dev,
429 	struct device_attribute *attr, char *buf)
430 {
431 	struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));
432 	ssize_t ret;
433 
434 	down_read(&led->rwsem);
435 	if (led->adf_on)
436 		ret = sprintf(buf, "on\n");
437 	else
438 		ret = sprintf(buf, "off\n");
439 	up_read(&led->rwsem);
440 
441 	return ret;
442 }
443 
444 static ssize_t bd2802_store_adv_conf(struct device *dev,
445 	struct device_attribute *attr, const char *buf, size_t count)
446 {
447 	struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));
448 
449 	if (!count)
450 		return -EINVAL;
451 
452 	down_write(&led->rwsem);
453 	if (!led->adf_on && !strncmp(buf, "on", 2))
454 		bd2802_enable_adv_conf(led);
455 	else if (led->adf_on && !strncmp(buf, "off", 3))
456 		bd2802_disable_adv_conf(led);
457 	up_write(&led->rwsem);
458 
459 	return count;
460 }
461 
462 static struct device_attribute bd2802_adv_conf_attr = {
463 	.attr = {
464 		.name = "advanced_configuration",
465 		.mode = 0644,
466 	},
467 	.show = bd2802_show_adv_conf,
468 	.store = bd2802_store_adv_conf,
469 };
470 
471 #define BD2802_CONTROL_ATTR(attr_name, name_str)			\
472 static ssize_t bd2802_show_##attr_name(struct device *dev,		\
473 	struct device_attribute *attr, char *buf)			\
474 {									\
475 	struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\
476 	ssize_t ret;							\
477 	down_read(&led->rwsem);						\
478 	ret = sprintf(buf, "0x%02x\n", led->attr_name);			\
479 	up_read(&led->rwsem);						\
480 	return ret;							\
481 }									\
482 static ssize_t bd2802_store_##attr_name(struct device *dev,		\
483 	struct device_attribute *attr, const char *buf, size_t count)	\
484 {									\
485 	struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\
486 	unsigned long val;						\
487 	int ret;							\
488 	if (!count)							\
489 		return -EINVAL;						\
490 	ret = kstrtoul(buf, 16, &val);					\
491 	if (ret)							\
492 		return ret;						\
493 	down_write(&led->rwsem);					\
494 	led->attr_name = val;						\
495 	up_write(&led->rwsem);						\
496 	return count;							\
497 }									\
498 static struct device_attribute bd2802_##attr_name##_attr = {		\
499 	.attr = {							\
500 		.name = name_str,					\
501 		.mode = 0644,						\
502 	},								\
503 	.show = bd2802_show_##attr_name,				\
504 	.store = bd2802_store_##attr_name,				\
505 };
506 
507 BD2802_CONTROL_ATTR(wave_pattern, "wave_pattern");
508 BD2802_CONTROL_ATTR(rgb_current, "rgb_current");
509 
510 static struct device_attribute *bd2802_attributes[] = {
511 	&bd2802_adv_conf_attr,
512 	&bd2802_wave_pattern_attr,
513 	&bd2802_rgb_current_attr,
514 };
515 
516 #define BD2802_CONTROL_RGBS(name, id, clr)				\
517 static int bd2802_set_##name##_brightness(struct led_classdev *led_cdev,\
518 					enum led_brightness value)	\
519 {									\
520 	struct bd2802_led *led =					\
521 		container_of(led_cdev, struct bd2802_led, cdev_##name);	\
522 	led->led_id = id;						\
523 	led->color = clr;						\
524 	if (value == LED_OFF) {						\
525 		led->state = BD2802_OFF;				\
526 		bd2802_turn_off(led, led->led_id, led->color);		\
527 	} else {							\
528 		led->state = BD2802_ON;					\
529 		bd2802_turn_on(led, led->led_id, led->color, BD2802_ON);\
530 	}								\
531 	return 0;							\
532 }									\
533 static int bd2802_set_##name##_blink(struct led_classdev *led_cdev,	\
534 		unsigned long *delay_on, unsigned long *delay_off)	\
535 {									\
536 	struct bd2802_led *led =					\
537 		container_of(led_cdev, struct bd2802_led, cdev_##name);	\
538 	if (*delay_on == 0 || *delay_off == 0)				\
539 		return -EINVAL;						\
540 	led->led_id = id;						\
541 	led->color = clr;						\
542 	led->state = BD2802_BLINK;					\
543 	bd2802_turn_on(led, led->led_id, led->color, BD2802_BLINK);	\
544 	return 0;							\
545 }
546 
547 BD2802_CONTROL_RGBS(led1r, LED1, RED);
548 BD2802_CONTROL_RGBS(led1g, LED1, GREEN);
549 BD2802_CONTROL_RGBS(led1b, LED1, BLUE);
550 BD2802_CONTROL_RGBS(led2r, LED2, RED);
551 BD2802_CONTROL_RGBS(led2g, LED2, GREEN);
552 BD2802_CONTROL_RGBS(led2b, LED2, BLUE);
553 
554 static int bd2802_register_led_classdev(struct bd2802_led *led)
555 {
556 	int ret;
557 
558 	led->cdev_led1r.name = "led1_R";
559 	led->cdev_led1r.brightness = LED_OFF;
560 	led->cdev_led1r.brightness_set_blocking = bd2802_set_led1r_brightness;
561 	led->cdev_led1r.blink_set = bd2802_set_led1r_blink;
562 
563 	ret = led_classdev_register(&led->client->dev, &led->cdev_led1r);
564 	if (ret < 0) {
565 		dev_err(&led->client->dev, "couldn't register LED %s\n",
566 							led->cdev_led1r.name);
567 		goto failed_unregister_led1_R;
568 	}
569 
570 	led->cdev_led1g.name = "led1_G";
571 	led->cdev_led1g.brightness = LED_OFF;
572 	led->cdev_led1g.brightness_set_blocking = bd2802_set_led1g_brightness;
573 	led->cdev_led1g.blink_set = bd2802_set_led1g_blink;
574 
575 	ret = led_classdev_register(&led->client->dev, &led->cdev_led1g);
576 	if (ret < 0) {
577 		dev_err(&led->client->dev, "couldn't register LED %s\n",
578 							led->cdev_led1g.name);
579 		goto failed_unregister_led1_G;
580 	}
581 
582 	led->cdev_led1b.name = "led1_B";
583 	led->cdev_led1b.brightness = LED_OFF;
584 	led->cdev_led1b.brightness_set_blocking = bd2802_set_led1b_brightness;
585 	led->cdev_led1b.blink_set = bd2802_set_led1b_blink;
586 
587 	ret = led_classdev_register(&led->client->dev, &led->cdev_led1b);
588 	if (ret < 0) {
589 		dev_err(&led->client->dev, "couldn't register LED %s\n",
590 							led->cdev_led1b.name);
591 		goto failed_unregister_led1_B;
592 	}
593 
594 	led->cdev_led2r.name = "led2_R";
595 	led->cdev_led2r.brightness = LED_OFF;
596 	led->cdev_led2r.brightness_set_blocking = bd2802_set_led2r_brightness;
597 	led->cdev_led2r.blink_set = bd2802_set_led2r_blink;
598 
599 	ret = led_classdev_register(&led->client->dev, &led->cdev_led2r);
600 	if (ret < 0) {
601 		dev_err(&led->client->dev, "couldn't register LED %s\n",
602 							led->cdev_led2r.name);
603 		goto failed_unregister_led2_R;
604 	}
605 
606 	led->cdev_led2g.name = "led2_G";
607 	led->cdev_led2g.brightness = LED_OFF;
608 	led->cdev_led2g.brightness_set_blocking = bd2802_set_led2g_brightness;
609 	led->cdev_led2g.blink_set = bd2802_set_led2g_blink;
610 
611 	ret = led_classdev_register(&led->client->dev, &led->cdev_led2g);
612 	if (ret < 0) {
613 		dev_err(&led->client->dev, "couldn't register LED %s\n",
614 							led->cdev_led2g.name);
615 		goto failed_unregister_led2_G;
616 	}
617 
618 	led->cdev_led2b.name = "led2_B";
619 	led->cdev_led2b.brightness = LED_OFF;
620 	led->cdev_led2b.brightness_set_blocking = bd2802_set_led2b_brightness;
621 	led->cdev_led2b.blink_set = bd2802_set_led2b_blink;
622 	led->cdev_led2b.flags |= LED_CORE_SUSPENDRESUME;
623 
624 	ret = led_classdev_register(&led->client->dev, &led->cdev_led2b);
625 	if (ret < 0) {
626 		dev_err(&led->client->dev, "couldn't register LED %s\n",
627 							led->cdev_led2b.name);
628 		goto failed_unregister_led2_B;
629 	}
630 
631 	return 0;
632 
633 failed_unregister_led2_B:
634 	led_classdev_unregister(&led->cdev_led2g);
635 failed_unregister_led2_G:
636 	led_classdev_unregister(&led->cdev_led2r);
637 failed_unregister_led2_R:
638 	led_classdev_unregister(&led->cdev_led1b);
639 failed_unregister_led1_B:
640 	led_classdev_unregister(&led->cdev_led1g);
641 failed_unregister_led1_G:
642 	led_classdev_unregister(&led->cdev_led1r);
643 failed_unregister_led1_R:
644 
645 	return ret;
646 }
647 
648 static void bd2802_unregister_led_classdev(struct bd2802_led *led)
649 {
650 	led_classdev_unregister(&led->cdev_led2b);
651 	led_classdev_unregister(&led->cdev_led2g);
652 	led_classdev_unregister(&led->cdev_led2r);
653 	led_classdev_unregister(&led->cdev_led1b);
654 	led_classdev_unregister(&led->cdev_led1g);
655 	led_classdev_unregister(&led->cdev_led1r);
656 }
657 
658 static int bd2802_probe(struct i2c_client *client,
659 			const struct i2c_device_id *id)
660 {
661 	struct bd2802_led *led;
662 	struct bd2802_led_platform_data *pdata;
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 	pdata = led->pdata = dev_get_platdata(&client->dev);
671 	i2c_set_clientdata(client, led);
672 
673 	/* Configure RESET GPIO (L: RESET, H: RESET cancel) */
674 	gpio_request_one(pdata->reset_gpio, GPIOF_OUT_INIT_HIGH, "RGB_RESETB");
675 
676 	/* Tacss = min 0.1ms */
677 	udelay(100);
678 
679 	/* Detect BD2802GU */
680 	ret = bd2802_write_byte(client, BD2802_REG_CLKSETUP, 0x00);
681 	if (ret < 0) {
682 		dev_err(&client->dev, "failed to detect device\n");
683 		return ret;
684 	} else
685 		dev_info(&client->dev, "return 0x%02x\n", ret);
686 
687 	/* To save the power, reset BD2802 after detecting */
688 	gpio_set_value(led->pdata->reset_gpio, 0);
689 
690 	/* Default attributes */
691 	led->wave_pattern = BD2802_PATTERN_HALF;
692 	led->rgb_current = BD2802_CURRENT_032;
693 
694 	init_rwsem(&led->rwsem);
695 
696 	for (i = 0; i < ARRAY_SIZE(bd2802_attributes); i++) {
697 		ret = device_create_file(&led->client->dev,
698 						bd2802_attributes[i]);
699 		if (ret) {
700 			dev_err(&led->client->dev, "failed: sysfs file %s\n",
701 					bd2802_attributes[i]->attr.name);
702 			goto failed_unregister_dev_file;
703 		}
704 	}
705 
706 	ret = bd2802_register_led_classdev(led);
707 	if (ret < 0)
708 		goto failed_unregister_dev_file;
709 
710 	return 0;
711 
712 failed_unregister_dev_file:
713 	for (i--; i >= 0; i--)
714 		device_remove_file(&led->client->dev, bd2802_attributes[i]);
715 	return ret;
716 }
717 
718 static int bd2802_remove(struct i2c_client *client)
719 {
720 	struct bd2802_led *led = i2c_get_clientdata(client);
721 	int i;
722 
723 	gpio_set_value(led->pdata->reset_gpio, 0);
724 	bd2802_unregister_led_classdev(led);
725 	if (led->adf_on)
726 		bd2802_disable_adv_conf(led);
727 	for (i = 0; i < ARRAY_SIZE(bd2802_attributes); i++)
728 		device_remove_file(&led->client->dev, bd2802_attributes[i]);
729 
730 	return 0;
731 }
732 
733 #ifdef CONFIG_PM_SLEEP
734 static void bd2802_restore_state(struct bd2802_led *led)
735 {
736 	int i;
737 
738 	for (i = 0; i < LED_NUM; i++) {
739 		if (led->led[i].r)
740 			bd2802_turn_on(led, i, RED, led->led[i].r);
741 		if (led->led[i].g)
742 			bd2802_turn_on(led, i, GREEN, led->led[i].g);
743 		if (led->led[i].b)
744 			bd2802_turn_on(led, i, BLUE, led->led[i].b);
745 	}
746 }
747 
748 static int bd2802_suspend(struct device *dev)
749 {
750 	struct i2c_client *client = to_i2c_client(dev);
751 	struct bd2802_led *led = i2c_get_clientdata(client);
752 
753 	gpio_set_value(led->pdata->reset_gpio, 0);
754 
755 	return 0;
756 }
757 
758 static int bd2802_resume(struct device *dev)
759 {
760 	struct i2c_client *client = to_i2c_client(dev);
761 	struct bd2802_led *led = i2c_get_clientdata(client);
762 
763 	if (!bd2802_is_all_off(led) || led->adf_on) {
764 		bd2802_reset_cancel(led);
765 		bd2802_restore_state(led);
766 	}
767 
768 	return 0;
769 }
770 #endif
771 
772 static SIMPLE_DEV_PM_OPS(bd2802_pm, bd2802_suspend, bd2802_resume);
773 
774 static const struct i2c_device_id bd2802_id[] = {
775 	{ "BD2802", 0 },
776 	{ }
777 };
778 MODULE_DEVICE_TABLE(i2c, bd2802_id);
779 
780 static struct i2c_driver bd2802_i2c_driver = {
781 	.driver	= {
782 		.name	= "BD2802",
783 		.pm	= &bd2802_pm,
784 	},
785 	.probe		= bd2802_probe,
786 	.remove		= bd2802_remove,
787 	.id_table	= bd2802_id,
788 };
789 
790 module_i2c_driver(bd2802_i2c_driver);
791 
792 MODULE_AUTHOR("Kim Kyuwon <q1.kim@samsung.com>");
793 MODULE_DESCRIPTION("BD2802 LED driver");
794 MODULE_LICENSE("GPL v2");
795