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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
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 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
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 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
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 else
244 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 else
299 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 else
439 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 descriptor
676 * 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 } else
691 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_SLEEP
738static 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#endif
775
776static SIMPLE_DEV_PM_OPS(bd2802_pm, bd2802_suspend, bd2802_resume);
777
778static const struct i2c_device_id bd2802_id[] = {
779 { "BD2802", 0 },
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");
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
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 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
107static 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
123static 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
131static 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
142static 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
147static 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
158static 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
170static 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
215static 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
227static 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
234static 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
248static 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
267static 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
286static 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
301static 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) \
318static 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} \
334static struct device_attribute bd2802_reg##reg_addr##_attr = { \
335 .attr = {.name = reg_name, .mode = 0644}, \
336 .store = bd2802_store_reg##reg_addr, \
337};
338
339BD2802_SET_REGISTER(0x00, "0x00");
340BD2802_SET_REGISTER(0x01, "0x01");
341BD2802_SET_REGISTER(0x02, "0x02");
342BD2802_SET_REGISTER(0x03, "0x03");
343BD2802_SET_REGISTER(0x04, "0x04");
344BD2802_SET_REGISTER(0x05, "0x05");
345BD2802_SET_REGISTER(0x06, "0x06");
346BD2802_SET_REGISTER(0x07, "0x07");
347BD2802_SET_REGISTER(0x08, "0x08");
348BD2802_SET_REGISTER(0x09, "0x09");
349BD2802_SET_REGISTER(0x0a, "0x0a");
350BD2802_SET_REGISTER(0x0b, "0x0b");
351BD2802_SET_REGISTER(0x0c, "0x0c");
352BD2802_SET_REGISTER(0x0d, "0x0d");
353BD2802_SET_REGISTER(0x0e, "0x0e");
354BD2802_SET_REGISTER(0x0f, "0x0f");
355BD2802_SET_REGISTER(0x10, "0x10");
356BD2802_SET_REGISTER(0x11, "0x11");
357BD2802_SET_REGISTER(0x12, "0x12");
358BD2802_SET_REGISTER(0x13, "0x13");
359BD2802_SET_REGISTER(0x14, "0x14");
360BD2802_SET_REGISTER(0x15, "0x15");
361
362static 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
387static 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
408failed_remove_files:
409 for (i--; i >= 0; i--)
410 device_remove_file(&led->client->dev,
411 bd2802_addr_attributes[i]);
412}
413
414static 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
428static 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
444static 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
462static 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) \
472static 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} \
482static 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} \
498static 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
507BD2802_CONTROL_ATTR(wave_pattern, "wave_pattern");
508BD2802_CONTROL_ATTR(rgb_current, "rgb_current");
509
510static 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) \
517static 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} \
533static 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
547BD2802_CONTROL_RGBS(led1r, LED1, RED);
548BD2802_CONTROL_RGBS(led1g, LED1, GREEN);
549BD2802_CONTROL_RGBS(led1b, LED1, BLUE);
550BD2802_CONTROL_RGBS(led2r, LED2, RED);
551BD2802_CONTROL_RGBS(led2g, LED2, GREEN);
552BD2802_CONTROL_RGBS(led2b, LED2, BLUE);
553
554static 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
633failed_unregister_led2_B:
634 led_classdev_unregister(&led->cdev_led2g);
635failed_unregister_led2_G:
636 led_classdev_unregister(&led->cdev_led2r);
637failed_unregister_led2_R:
638 led_classdev_unregister(&led->cdev_led1b);
639failed_unregister_led1_B:
640 led_classdev_unregister(&led->cdev_led1g);
641failed_unregister_led1_G:
642 led_classdev_unregister(&led->cdev_led1r);
643failed_unregister_led1_R:
644
645 return ret;
646}
647
648static 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
658static 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
712failed_unregister_dev_file:
713 for (i--; i >= 0; i--)
714 device_remove_file(&led->client->dev, bd2802_attributes[i]);
715 return ret;
716}
717
718static 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
734static 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
748static 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
758static 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
772static SIMPLE_DEV_PM_OPS(bd2802_pm, bd2802_suspend, bd2802_resume);
773
774static const struct i2c_device_id bd2802_id[] = {
775 { "BD2802", 0 },
776 { }
777};
778MODULE_DEVICE_TABLE(i2c, bd2802_id);
779
780static 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
790module_i2c_driver(bd2802_i2c_driver);
791
792MODULE_AUTHOR("Kim Kyuwon <q1.kim@samsung.com>");
793MODULE_DESCRIPTION("BD2802 LED driver");
794MODULE_LICENSE("GPL v2");