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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 struct work_struct work;
76
77 struct led_state led[2];
78
79 /*
80 * Making led_classdev as array is not recommended, because array
81 * members prevent using 'container_of' macro. So repetitive works
82 * are needed.
83 */
84 struct led_classdev cdev_led1r;
85 struct led_classdev cdev_led1g;
86 struct led_classdev cdev_led1b;
87 struct led_classdev cdev_led2r;
88 struct led_classdev cdev_led2g;
89 struct led_classdev cdev_led2b;
90
91 /*
92 * Advanced Configuration Function(ADF) mode:
93 * In ADF mode, user can set registers of BD2802GU directly,
94 * therefore BD2802GU doesn't enter reset state.
95 */
96 int adf_on;
97
98 enum led_ids led_id;
99 enum led_colors color;
100 enum led_bits state;
101
102 /* General attributes of RGB LEDs */
103 int wave_pattern;
104 int rgb_current;
105};
106
107
108/*--------------------------------------------------------------*/
109/* BD2802GU helper functions */
110/*--------------------------------------------------------------*/
111
112static inline int bd2802_is_rgb_off(struct bd2802_led *led, enum led_ids id,
113 enum led_colors color)
114{
115 switch (color) {
116 case RED:
117 return !led->led[id].r;
118 case GREEN:
119 return !led->led[id].g;
120 case BLUE:
121 return !led->led[id].b;
122 default:
123 dev_err(&led->client->dev, "%s: Invalid color\n", __func__);
124 return -EINVAL;
125 }
126}
127
128static inline int bd2802_is_led_off(struct bd2802_led *led, enum led_ids id)
129{
130 if (led->led[id].r || led->led[id].g || led->led[id].b)
131 return 0;
132
133 return 1;
134}
135
136static inline int bd2802_is_all_off(struct bd2802_led *led)
137{
138 int i;
139
140 for (i = 0; i < LED_NUM; i++)
141 if (!bd2802_is_led_off(led, i))
142 return 0;
143
144 return 1;
145}
146
147static inline u8 bd2802_get_base_offset(enum led_ids id, enum led_colors color)
148{
149 return id * BD2802_LED_OFFSET + color * BD2802_COLOR_OFFSET;
150}
151
152static inline u8 bd2802_get_reg_addr(enum led_ids id, enum led_colors color,
153 u8 reg_offset)
154{
155 return reg_offset + bd2802_get_base_offset(id, color);
156}
157
158
159/*--------------------------------------------------------------*/
160/* BD2802GU core functions */
161/*--------------------------------------------------------------*/
162
163static int bd2802_write_byte(struct i2c_client *client, u8 reg, u8 val)
164{
165 int ret = i2c_smbus_write_byte_data(client, reg, val);
166 if (ret >= 0)
167 return 0;
168
169 dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n",
170 __func__, reg, val, ret);
171
172 return ret;
173}
174
175static void bd2802_update_state(struct bd2802_led *led, enum led_ids id,
176 enum led_colors color, enum led_bits led_bit)
177{
178 int i;
179 u8 value;
180
181 for (i = 0; i < LED_NUM; i++) {
182 if (i == id) {
183 switch (color) {
184 case RED:
185 led->led[i].r = led_bit;
186 break;
187 case GREEN:
188 led->led[i].g = led_bit;
189 break;
190 case BLUE:
191 led->led[i].b = led_bit;
192 break;
193 default:
194 dev_err(&led->client->dev,
195 "%s: Invalid color\n", __func__);
196 return;
197 }
198 }
199 }
200
201 if (led_bit == BD2802_BLINK || led_bit == BD2802_ON)
202 return;
203
204 if (!bd2802_is_led_off(led, id))
205 return;
206
207 if (bd2802_is_all_off(led) && !led->adf_on) {
208 gpio_set_value(led->pdata->reset_gpio, 0);
209 return;
210 }
211
212 /*
213 * In this case, other led is turned on, and current led is turned
214 * off. So set RGB LED Control register to stop the current RGB LED
215 */
216 value = (id == LED1) ? LED_CTL(1, 0) : LED_CTL(0, 1);
217 bd2802_write_byte(led->client, BD2802_REG_CONTROL, value);
218}
219
220static void bd2802_configure(struct bd2802_led *led)
221{
222 struct bd2802_led_platform_data *pdata = led->pdata;
223 u8 reg;
224
225 reg = bd2802_get_reg_addr(LED1, RED, BD2802_REG_HOURSETUP);
226 bd2802_write_byte(led->client, reg, pdata->rgb_time);
227
228 reg = bd2802_get_reg_addr(LED2, RED, BD2802_REG_HOURSETUP);
229 bd2802_write_byte(led->client, reg, pdata->rgb_time);
230}
231
232static void bd2802_reset_cancel(struct bd2802_led *led)
233{
234 gpio_set_value(led->pdata->reset_gpio, 1);
235 udelay(100);
236 bd2802_configure(led);
237}
238
239static void bd2802_enable(struct bd2802_led *led, enum led_ids id)
240{
241 enum led_ids other_led = (id == LED1) ? LED2 : LED1;
242 u8 value, other_led_on;
243
244 other_led_on = !bd2802_is_led_off(led, other_led);
245 if (id == LED1)
246 value = LED_CTL(other_led_on, 1);
247 else
248 value = LED_CTL(1 , other_led_on);
249
250 bd2802_write_byte(led->client, BD2802_REG_CONTROL, value);
251}
252
253static void bd2802_set_on(struct bd2802_led *led, enum led_ids id,
254 enum led_colors color)
255{
256 u8 reg;
257
258 if (bd2802_is_all_off(led) && !led->adf_on)
259 bd2802_reset_cancel(led);
260
261 reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT1SETUP);
262 bd2802_write_byte(led->client, reg, led->rgb_current);
263 reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT2SETUP);
264 bd2802_write_byte(led->client, reg, BD2802_CURRENT_000);
265 reg = bd2802_get_reg_addr(id, color, BD2802_REG_WAVEPATTERN);
266 bd2802_write_byte(led->client, reg, BD2802_PATTERN_FULL);
267
268 bd2802_enable(led, id);
269 bd2802_update_state(led, id, color, BD2802_ON);
270}
271
272static void bd2802_set_blink(struct bd2802_led *led, enum led_ids id,
273 enum led_colors color)
274{
275 u8 reg;
276
277 if (bd2802_is_all_off(led) && !led->adf_on)
278 bd2802_reset_cancel(led);
279
280 reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT1SETUP);
281 bd2802_write_byte(led->client, reg, BD2802_CURRENT_000);
282 reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT2SETUP);
283 bd2802_write_byte(led->client, reg, led->rgb_current);
284 reg = bd2802_get_reg_addr(id, color, BD2802_REG_WAVEPATTERN);
285 bd2802_write_byte(led->client, reg, led->wave_pattern);
286
287 bd2802_enable(led, id);
288 bd2802_update_state(led, id, color, BD2802_BLINK);
289}
290
291static void bd2802_turn_on(struct bd2802_led *led, enum led_ids id,
292 enum led_colors color, enum led_bits led_bit)
293{
294 if (led_bit == BD2802_OFF) {
295 dev_err(&led->client->dev,
296 "Only 'blink' and 'on' are allowed\n");
297 return;
298 }
299
300 if (led_bit == BD2802_BLINK)
301 bd2802_set_blink(led, id, color);
302 else
303 bd2802_set_on(led, id, color);
304}
305
306static void bd2802_turn_off(struct bd2802_led *led, enum led_ids id,
307 enum led_colors color)
308{
309 u8 reg;
310
311 if (bd2802_is_rgb_off(led, id, color))
312 return;
313
314 reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT1SETUP);
315 bd2802_write_byte(led->client, reg, BD2802_CURRENT_000);
316 reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT2SETUP);
317 bd2802_write_byte(led->client, reg, BD2802_CURRENT_000);
318
319 bd2802_update_state(led, id, color, BD2802_OFF);
320}
321
322#define BD2802_SET_REGISTER(reg_addr, reg_name) \
323static ssize_t bd2802_store_reg##reg_addr(struct device *dev, \
324 struct device_attribute *attr, const char *buf, size_t count) \
325{ \
326 struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\
327 unsigned long val; \
328 int ret; \
329 if (!count) \
330 return -EINVAL; \
331 ret = strict_strtoul(buf, 16, &val); \
332 if (ret) \
333 return ret; \
334 down_write(&led->rwsem); \
335 bd2802_write_byte(led->client, reg_addr, (u8) val); \
336 up_write(&led->rwsem); \
337 return count; \
338} \
339static struct device_attribute bd2802_reg##reg_addr##_attr = { \
340 .attr = {.name = reg_name, .mode = 0644}, \
341 .store = bd2802_store_reg##reg_addr, \
342};
343
344BD2802_SET_REGISTER(0x00, "0x00");
345BD2802_SET_REGISTER(0x01, "0x01");
346BD2802_SET_REGISTER(0x02, "0x02");
347BD2802_SET_REGISTER(0x03, "0x03");
348BD2802_SET_REGISTER(0x04, "0x04");
349BD2802_SET_REGISTER(0x05, "0x05");
350BD2802_SET_REGISTER(0x06, "0x06");
351BD2802_SET_REGISTER(0x07, "0x07");
352BD2802_SET_REGISTER(0x08, "0x08");
353BD2802_SET_REGISTER(0x09, "0x09");
354BD2802_SET_REGISTER(0x0a, "0x0a");
355BD2802_SET_REGISTER(0x0b, "0x0b");
356BD2802_SET_REGISTER(0x0c, "0x0c");
357BD2802_SET_REGISTER(0x0d, "0x0d");
358BD2802_SET_REGISTER(0x0e, "0x0e");
359BD2802_SET_REGISTER(0x0f, "0x0f");
360BD2802_SET_REGISTER(0x10, "0x10");
361BD2802_SET_REGISTER(0x11, "0x11");
362BD2802_SET_REGISTER(0x12, "0x12");
363BD2802_SET_REGISTER(0x13, "0x13");
364BD2802_SET_REGISTER(0x14, "0x14");
365BD2802_SET_REGISTER(0x15, "0x15");
366
367static struct device_attribute *bd2802_addr_attributes[] = {
368 &bd2802_reg0x00_attr,
369 &bd2802_reg0x01_attr,
370 &bd2802_reg0x02_attr,
371 &bd2802_reg0x03_attr,
372 &bd2802_reg0x04_attr,
373 &bd2802_reg0x05_attr,
374 &bd2802_reg0x06_attr,
375 &bd2802_reg0x07_attr,
376 &bd2802_reg0x08_attr,
377 &bd2802_reg0x09_attr,
378 &bd2802_reg0x0a_attr,
379 &bd2802_reg0x0b_attr,
380 &bd2802_reg0x0c_attr,
381 &bd2802_reg0x0d_attr,
382 &bd2802_reg0x0e_attr,
383 &bd2802_reg0x0f_attr,
384 &bd2802_reg0x10_attr,
385 &bd2802_reg0x11_attr,
386 &bd2802_reg0x12_attr,
387 &bd2802_reg0x13_attr,
388 &bd2802_reg0x14_attr,
389 &bd2802_reg0x15_attr,
390};
391
392static void bd2802_enable_adv_conf(struct bd2802_led *led)
393{
394 int i, ret;
395
396 for (i = 0; i < ARRAY_SIZE(bd2802_addr_attributes); i++) {
397 ret = device_create_file(&led->client->dev,
398 bd2802_addr_attributes[i]);
399 if (ret) {
400 dev_err(&led->client->dev, "failed: sysfs file %s\n",
401 bd2802_addr_attributes[i]->attr.name);
402 goto failed_remove_files;
403 }
404 }
405
406 if (bd2802_is_all_off(led))
407 bd2802_reset_cancel(led);
408
409 led->adf_on = 1;
410
411 return;
412
413failed_remove_files:
414 for (i--; i >= 0; i--)
415 device_remove_file(&led->client->dev,
416 bd2802_addr_attributes[i]);
417}
418
419static void bd2802_disable_adv_conf(struct bd2802_led *led)
420{
421 int i;
422
423 for (i = 0; i < ARRAY_SIZE(bd2802_addr_attributes); i++)
424 device_remove_file(&led->client->dev,
425 bd2802_addr_attributes[i]);
426
427 if (bd2802_is_all_off(led))
428 gpio_set_value(led->pdata->reset_gpio, 0);
429
430 led->adf_on = 0;
431}
432
433static ssize_t bd2802_show_adv_conf(struct device *dev,
434 struct device_attribute *attr, char *buf)
435{
436 struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));
437 ssize_t ret;
438
439 down_read(&led->rwsem);
440 if (led->adf_on)
441 ret = sprintf(buf, "on\n");
442 else
443 ret = sprintf(buf, "off\n");
444 up_read(&led->rwsem);
445
446 return ret;
447}
448
449static ssize_t bd2802_store_adv_conf(struct device *dev,
450 struct device_attribute *attr, const char *buf, size_t count)
451{
452 struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));
453
454 if (!count)
455 return -EINVAL;
456
457 down_write(&led->rwsem);
458 if (!led->adf_on && !strncmp(buf, "on", 2))
459 bd2802_enable_adv_conf(led);
460 else if (led->adf_on && !strncmp(buf, "off", 3))
461 bd2802_disable_adv_conf(led);
462 up_write(&led->rwsem);
463
464 return count;
465}
466
467static struct device_attribute bd2802_adv_conf_attr = {
468 .attr = {
469 .name = "advanced_configuration",
470 .mode = 0644,
471 },
472 .show = bd2802_show_adv_conf,
473 .store = bd2802_store_adv_conf,
474};
475
476#define BD2802_CONTROL_ATTR(attr_name, name_str) \
477static ssize_t bd2802_show_##attr_name(struct device *dev, \
478 struct device_attribute *attr, char *buf) \
479{ \
480 struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\
481 ssize_t ret; \
482 down_read(&led->rwsem); \
483 ret = sprintf(buf, "0x%02x\n", led->attr_name); \
484 up_read(&led->rwsem); \
485 return ret; \
486} \
487static ssize_t bd2802_store_##attr_name(struct device *dev, \
488 struct device_attribute *attr, const char *buf, size_t count) \
489{ \
490 struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\
491 unsigned long val; \
492 int ret; \
493 if (!count) \
494 return -EINVAL; \
495 ret = strict_strtoul(buf, 16, &val); \
496 if (ret) \
497 return ret; \
498 down_write(&led->rwsem); \
499 led->attr_name = val; \
500 up_write(&led->rwsem); \
501 return count; \
502} \
503static struct device_attribute bd2802_##attr_name##_attr = { \
504 .attr = { \
505 .name = name_str, \
506 .mode = 0644, \
507 }, \
508 .show = bd2802_show_##attr_name, \
509 .store = bd2802_store_##attr_name, \
510};
511
512BD2802_CONTROL_ATTR(wave_pattern, "wave_pattern");
513BD2802_CONTROL_ATTR(rgb_current, "rgb_current");
514
515static struct device_attribute *bd2802_attributes[] = {
516 &bd2802_adv_conf_attr,
517 &bd2802_wave_pattern_attr,
518 &bd2802_rgb_current_attr,
519};
520
521static void bd2802_led_work(struct work_struct *work)
522{
523 struct bd2802_led *led = container_of(work, struct bd2802_led, work);
524
525 if (led->state)
526 bd2802_turn_on(led, led->led_id, led->color, led->state);
527 else
528 bd2802_turn_off(led, led->led_id, led->color);
529}
530
531#define BD2802_CONTROL_RGBS(name, id, clr) \
532static void bd2802_set_##name##_brightness(struct led_classdev *led_cdev,\
533 enum led_brightness value) \
534{ \
535 struct bd2802_led *led = \
536 container_of(led_cdev, struct bd2802_led, cdev_##name); \
537 led->led_id = id; \
538 led->color = clr; \
539 if (value == LED_OFF) \
540 led->state = BD2802_OFF; \
541 else \
542 led->state = BD2802_ON; \
543 schedule_work(&led->work); \
544} \
545static int bd2802_set_##name##_blink(struct led_classdev *led_cdev, \
546 unsigned long *delay_on, unsigned long *delay_off) \
547{ \
548 struct bd2802_led *led = \
549 container_of(led_cdev, struct bd2802_led, cdev_##name); \
550 if (*delay_on == 0 || *delay_off == 0) \
551 return -EINVAL; \
552 led->led_id = id; \
553 led->color = clr; \
554 led->state = BD2802_BLINK; \
555 schedule_work(&led->work); \
556 return 0; \
557}
558
559BD2802_CONTROL_RGBS(led1r, LED1, RED);
560BD2802_CONTROL_RGBS(led1g, LED1, GREEN);
561BD2802_CONTROL_RGBS(led1b, LED1, BLUE);
562BD2802_CONTROL_RGBS(led2r, LED2, RED);
563BD2802_CONTROL_RGBS(led2g, LED2, GREEN);
564BD2802_CONTROL_RGBS(led2b, LED2, BLUE);
565
566static int bd2802_register_led_classdev(struct bd2802_led *led)
567{
568 int ret;
569
570 INIT_WORK(&led->work, bd2802_led_work);
571
572 led->cdev_led1r.name = "led1_R";
573 led->cdev_led1r.brightness = LED_OFF;
574 led->cdev_led1r.brightness_set = bd2802_set_led1r_brightness;
575 led->cdev_led1r.blink_set = bd2802_set_led1r_blink;
576
577 ret = led_classdev_register(&led->client->dev, &led->cdev_led1r);
578 if (ret < 0) {
579 dev_err(&led->client->dev, "couldn't register LED %s\n",
580 led->cdev_led1r.name);
581 goto failed_unregister_led1_R;
582 }
583
584 led->cdev_led1g.name = "led1_G";
585 led->cdev_led1g.brightness = LED_OFF;
586 led->cdev_led1g.brightness_set = bd2802_set_led1g_brightness;
587 led->cdev_led1g.blink_set = bd2802_set_led1g_blink;
588
589 ret = led_classdev_register(&led->client->dev, &led->cdev_led1g);
590 if (ret < 0) {
591 dev_err(&led->client->dev, "couldn't register LED %s\n",
592 led->cdev_led1g.name);
593 goto failed_unregister_led1_G;
594 }
595
596 led->cdev_led1b.name = "led1_B";
597 led->cdev_led1b.brightness = LED_OFF;
598 led->cdev_led1b.brightness_set = bd2802_set_led1b_brightness;
599 led->cdev_led1b.blink_set = bd2802_set_led1b_blink;
600
601 ret = led_classdev_register(&led->client->dev, &led->cdev_led1b);
602 if (ret < 0) {
603 dev_err(&led->client->dev, "couldn't register LED %s\n",
604 led->cdev_led1b.name);
605 goto failed_unregister_led1_B;
606 }
607
608 led->cdev_led2r.name = "led2_R";
609 led->cdev_led2r.brightness = LED_OFF;
610 led->cdev_led2r.brightness_set = bd2802_set_led2r_brightness;
611 led->cdev_led2r.blink_set = bd2802_set_led2r_blink;
612
613 ret = led_classdev_register(&led->client->dev, &led->cdev_led2r);
614 if (ret < 0) {
615 dev_err(&led->client->dev, "couldn't register LED %s\n",
616 led->cdev_led2r.name);
617 goto failed_unregister_led2_R;
618 }
619
620 led->cdev_led2g.name = "led2_G";
621 led->cdev_led2g.brightness = LED_OFF;
622 led->cdev_led2g.brightness_set = bd2802_set_led2g_brightness;
623 led->cdev_led2g.blink_set = bd2802_set_led2g_blink;
624
625 ret = led_classdev_register(&led->client->dev, &led->cdev_led2g);
626 if (ret < 0) {
627 dev_err(&led->client->dev, "couldn't register LED %s\n",
628 led->cdev_led2g.name);
629 goto failed_unregister_led2_G;
630 }
631
632 led->cdev_led2b.name = "led2_B";
633 led->cdev_led2b.brightness = LED_OFF;
634 led->cdev_led2b.brightness_set = bd2802_set_led2b_brightness;
635 led->cdev_led2b.blink_set = bd2802_set_led2b_blink;
636 led->cdev_led2b.flags |= LED_CORE_SUSPENDRESUME;
637
638 ret = led_classdev_register(&led->client->dev, &led->cdev_led2b);
639 if (ret < 0) {
640 dev_err(&led->client->dev, "couldn't register LED %s\n",
641 led->cdev_led2b.name);
642 goto failed_unregister_led2_B;
643 }
644
645 return 0;
646
647failed_unregister_led2_B:
648 led_classdev_unregister(&led->cdev_led2g);
649failed_unregister_led2_G:
650 led_classdev_unregister(&led->cdev_led2r);
651failed_unregister_led2_R:
652 led_classdev_unregister(&led->cdev_led1b);
653failed_unregister_led1_B:
654 led_classdev_unregister(&led->cdev_led1g);
655failed_unregister_led1_G:
656 led_classdev_unregister(&led->cdev_led1r);
657failed_unregister_led1_R:
658
659 return ret;
660}
661
662static void bd2802_unregister_led_classdev(struct bd2802_led *led)
663{
664 cancel_work_sync(&led->work);
665 led_classdev_unregister(&led->cdev_led2b);
666 led_classdev_unregister(&led->cdev_led2g);
667 led_classdev_unregister(&led->cdev_led2r);
668 led_classdev_unregister(&led->cdev_led1b);
669 led_classdev_unregister(&led->cdev_led1g);
670 led_classdev_unregister(&led->cdev_led1r);
671}
672
673static int __devinit bd2802_probe(struct i2c_client *client,
674 const struct i2c_device_id *id)
675{
676 struct bd2802_led *led;
677 struct bd2802_led_platform_data *pdata;
678 int ret, i;
679
680 led = kzalloc(sizeof(struct bd2802_led), GFP_KERNEL);
681 if (!led) {
682 dev_err(&client->dev, "failed to allocate driver data\n");
683 return -ENOMEM;
684 }
685
686 led->client = client;
687 pdata = led->pdata = client->dev.platform_data;
688 i2c_set_clientdata(client, led);
689
690 /* Configure RESET GPIO (L: RESET, H: RESET cancel) */
691 gpio_request_one(pdata->reset_gpio, GPIOF_OUT_INIT_HIGH, "RGB_RESETB");
692
693 /* Tacss = min 0.1ms */
694 udelay(100);
695
696 /* Detect BD2802GU */
697 ret = bd2802_write_byte(client, BD2802_REG_CLKSETUP, 0x00);
698 if (ret < 0) {
699 dev_err(&client->dev, "failed to detect device\n");
700 goto failed_free;
701 } else
702 dev_info(&client->dev, "return 0x%02x\n", ret);
703
704 /* To save the power, reset BD2802 after detecting */
705 gpio_set_value(led->pdata->reset_gpio, 0);
706
707 /* Default attributes */
708 led->wave_pattern = BD2802_PATTERN_HALF;
709 led->rgb_current = BD2802_CURRENT_032;
710
711 init_rwsem(&led->rwsem);
712
713 for (i = 0; i < ARRAY_SIZE(bd2802_attributes); i++) {
714 ret = device_create_file(&led->client->dev,
715 bd2802_attributes[i]);
716 if (ret) {
717 dev_err(&led->client->dev, "failed: sysfs file %s\n",
718 bd2802_attributes[i]->attr.name);
719 goto failed_unregister_dev_file;
720 }
721 }
722
723 ret = bd2802_register_led_classdev(led);
724 if (ret < 0)
725 goto failed_unregister_dev_file;
726
727 return 0;
728
729failed_unregister_dev_file:
730 for (i--; i >= 0; i--)
731 device_remove_file(&led->client->dev, bd2802_attributes[i]);
732failed_free:
733 kfree(led);
734
735 return ret;
736}
737
738static int __exit bd2802_remove(struct i2c_client *client)
739{
740 struct bd2802_led *led = i2c_get_clientdata(client);
741 int i;
742
743 gpio_set_value(led->pdata->reset_gpio, 0);
744 bd2802_unregister_led_classdev(led);
745 if (led->adf_on)
746 bd2802_disable_adv_conf(led);
747 for (i = 0; i < ARRAY_SIZE(bd2802_attributes); i++)
748 device_remove_file(&led->client->dev, bd2802_attributes[i]);
749 kfree(led);
750
751 return 0;
752}
753
754#ifdef CONFIG_PM
755
756static void bd2802_restore_state(struct bd2802_led *led)
757{
758 int i;
759
760 for (i = 0; i < LED_NUM; i++) {
761 if (led->led[i].r)
762 bd2802_turn_on(led, i, RED, led->led[i].r);
763 if (led->led[i].g)
764 bd2802_turn_on(led, i, GREEN, led->led[i].g);
765 if (led->led[i].b)
766 bd2802_turn_on(led, i, BLUE, led->led[i].b);
767 }
768}
769
770static int bd2802_suspend(struct device *dev)
771{
772 struct i2c_client *client = to_i2c_client(dev);
773 struct bd2802_led *led = i2c_get_clientdata(client);
774
775 gpio_set_value(led->pdata->reset_gpio, 0);
776
777 return 0;
778}
779
780static int bd2802_resume(struct device *dev)
781{
782 struct i2c_client *client = to_i2c_client(dev);
783 struct bd2802_led *led = i2c_get_clientdata(client);
784
785 if (!bd2802_is_all_off(led) || led->adf_on) {
786 bd2802_reset_cancel(led);
787 bd2802_restore_state(led);
788 }
789
790 return 0;
791}
792
793static SIMPLE_DEV_PM_OPS(bd2802_pm, bd2802_suspend, bd2802_resume);
794#define BD2802_PM (&bd2802_pm)
795#else /* CONFIG_PM */
796#define BD2802_PM NULL
797#endif
798
799static const struct i2c_device_id bd2802_id[] = {
800 { "BD2802", 0 },
801 { }
802};
803MODULE_DEVICE_TABLE(i2c, bd2802_id);
804
805static struct i2c_driver bd2802_i2c_driver = {
806 .driver = {
807 .name = "BD2802",
808 .pm = BD2802_PM,
809 },
810 .probe = bd2802_probe,
811 .remove = __exit_p(bd2802_remove),
812 .id_table = bd2802_id,
813};
814
815module_i2c_driver(bd2802_i2c_driver);
816
817MODULE_AUTHOR("Kim Kyuwon <q1.kim@samsung.com>");
818MODULE_DESCRIPTION("BD2802 LED driver");
819MODULE_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");