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