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
38 enum led_ids {
39 LED1,
40 LED2,
41 LED_NUM,
42 };
43
44 enum led_colors {
45 RED,
46 GREEN,
47 BLUE,
48 };
49
50 enum led_bits {
51 BD2802_OFF,
52 BD2802_BLINK,
53 BD2802_ON,
54 };
55
56 /*
57 * State '0' : 'off'
58 * State '1' : 'blink'
59 * State '2' : 'on'.
60 */
61 struct led_state {
62 unsigned r:2;
63 unsigned g:2;
64 unsigned b:2;
65 };
66
67 struct bd2802_led {
68 struct bd2802_led_platform_data *pdata;
69 struct i2c_client *client;
70 struct 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
bd2802_is_rgb_off(struct bd2802_led * led,enum led_ids id,enum led_colors color)108 static 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
bd2802_is_led_off(struct bd2802_led * led,enum led_ids id)124 static 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
bd2802_is_all_off(struct bd2802_led * led)132 static 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
bd2802_get_base_offset(enum led_ids id,enum led_colors color)143 static 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
bd2802_get_reg_addr(enum led_ids id,enum led_colors color,u8 reg_offset)148 static 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
bd2802_write_byte(struct i2c_client * client,u8 reg,u8 val)159 static 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
bd2802_update_state(struct bd2802_led * led,enum led_ids id,enum led_colors color,enum led_bits led_bit)171 static 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
bd2802_configure(struct bd2802_led * led)216 static 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
bd2802_reset_cancel(struct bd2802_led * led)228 static 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
bd2802_enable(struct bd2802_led * led,enum led_ids id)235 static 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
bd2802_set_on(struct bd2802_led * led,enum led_ids id,enum led_colors color)249 static 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
bd2802_set_blink(struct bd2802_led * led,enum led_ids id,enum led_colors color)268 static 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
bd2802_turn_on(struct bd2802_led * led,enum led_ids id,enum led_colors color,enum led_bits led_bit)287 static 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
bd2802_turn_off(struct bd2802_led * led,enum led_ids id,enum led_colors color)302 static 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) \
319 static 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 } \
335 static struct device_attribute bd2802_reg##reg_addr##_attr = { \
336 .attr = {.name = reg_name, .mode = 0644}, \
337 .store = bd2802_store_reg##reg_addr, \
338 };
339
340 BD2802_SET_REGISTER(0x00, "0x00");
341 BD2802_SET_REGISTER(0x01, "0x01");
342 BD2802_SET_REGISTER(0x02, "0x02");
343 BD2802_SET_REGISTER(0x03, "0x03");
344 BD2802_SET_REGISTER(0x04, "0x04");
345 BD2802_SET_REGISTER(0x05, "0x05");
346 BD2802_SET_REGISTER(0x06, "0x06");
347 BD2802_SET_REGISTER(0x07, "0x07");
348 BD2802_SET_REGISTER(0x08, "0x08");
349 BD2802_SET_REGISTER(0x09, "0x09");
350 BD2802_SET_REGISTER(0x0a, "0x0a");
351 BD2802_SET_REGISTER(0x0b, "0x0b");
352 BD2802_SET_REGISTER(0x0c, "0x0c");
353 BD2802_SET_REGISTER(0x0d, "0x0d");
354 BD2802_SET_REGISTER(0x0e, "0x0e");
355 BD2802_SET_REGISTER(0x0f, "0x0f");
356 BD2802_SET_REGISTER(0x10, "0x10");
357 BD2802_SET_REGISTER(0x11, "0x11");
358 BD2802_SET_REGISTER(0x12, "0x12");
359 BD2802_SET_REGISTER(0x13, "0x13");
360 BD2802_SET_REGISTER(0x14, "0x14");
361 BD2802_SET_REGISTER(0x15, "0x15");
362
363 static 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
bd2802_enable_adv_conf(struct bd2802_led * led)388 static 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
409 failed_remove_files:
410 for (i--; i >= 0; i--)
411 device_remove_file(&led->client->dev,
412 bd2802_addr_attributes[i]);
413 }
414
bd2802_disable_adv_conf(struct bd2802_led * led)415 static 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
bd2802_show_adv_conf(struct device * dev,struct device_attribute * attr,char * buf)429 static 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
bd2802_store_adv_conf(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)445 static 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
463 static 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) \
473 static 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 } \
483 static 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 } \
499 static 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
508 BD2802_CONTROL_ATTR(wave_pattern, "wave_pattern");
509 BD2802_CONTROL_ATTR(rgb_current, "rgb_current");
510
511 static 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) \
518 static 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 } \
534 static 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
548 BD2802_CONTROL_RGBS(led1r, LED1, RED);
549 BD2802_CONTROL_RGBS(led1g, LED1, GREEN);
550 BD2802_CONTROL_RGBS(led1b, LED1, BLUE);
551 BD2802_CONTROL_RGBS(led2r, LED2, RED);
552 BD2802_CONTROL_RGBS(led2g, LED2, GREEN);
553 BD2802_CONTROL_RGBS(led2b, LED2, BLUE);
554
bd2802_register_led_classdev(struct bd2802_led * led)555 static 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
634 failed_unregister_led2_B:
635 led_classdev_unregister(&led->cdev_led2g);
636 failed_unregister_led2_G:
637 led_classdev_unregister(&led->cdev_led2r);
638 failed_unregister_led2_R:
639 led_classdev_unregister(&led->cdev_led1b);
640 failed_unregister_led1_B:
641 led_classdev_unregister(&led->cdev_led1g);
642 failed_unregister_led1_G:
643 led_classdev_unregister(&led->cdev_led1r);
644 failed_unregister_led1_R:
645
646 return ret;
647 }
648
bd2802_unregister_led_classdev(struct bd2802_led * led)649 static 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
bd2802_probe(struct i2c_client * client,const struct i2c_device_id * id)659 static int bd2802_probe(struct i2c_client *client,
660 const struct i2c_device_id *id)
661 {
662 struct bd2802_led *led;
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 i2c_set_clientdata(client, led);
671
672 /*
673 * Configure RESET GPIO (L: RESET, H: RESET cancel)
674 *
675 * We request the reset GPIO as OUT_LOW which means de-asserted,
676 * board files specifying this GPIO line in a machine descriptor
677 * table should take care to specify GPIO_ACTIVE_LOW for this line.
678 */
679 led->reset = devm_gpiod_get(&client->dev, "reset", GPIOD_OUT_LOW);
680 if (IS_ERR(led->reset))
681 return PTR_ERR(led->reset);
682
683 /* Tacss = min 0.1ms */
684 udelay(100);
685
686 /* Detect BD2802GU */
687 ret = bd2802_write_byte(client, BD2802_REG_CLKSETUP, 0x00);
688 if (ret < 0) {
689 dev_err(&client->dev, "failed to detect device\n");
690 return ret;
691 } else
692 dev_info(&client->dev, "return 0x%02x\n", ret);
693
694 /* To save the power, reset BD2802 after detecting */
695 gpiod_set_value(led->reset, 1);
696
697 /* Default attributes */
698 led->wave_pattern = BD2802_PATTERN_HALF;
699 led->rgb_current = BD2802_CURRENT_032;
700
701 init_rwsem(&led->rwsem);
702
703 for (i = 0; i < ARRAY_SIZE(bd2802_attributes); i++) {
704 ret = device_create_file(&led->client->dev,
705 bd2802_attributes[i]);
706 if (ret) {
707 dev_err(&led->client->dev, "failed: sysfs file %s\n",
708 bd2802_attributes[i]->attr.name);
709 goto failed_unregister_dev_file;
710 }
711 }
712
713 ret = bd2802_register_led_classdev(led);
714 if (ret < 0)
715 goto failed_unregister_dev_file;
716
717 return 0;
718
719 failed_unregister_dev_file:
720 for (i--; i >= 0; i--)
721 device_remove_file(&led->client->dev, bd2802_attributes[i]);
722 return ret;
723 }
724
bd2802_remove(struct i2c_client * client)725 static int bd2802_remove(struct i2c_client *client)
726 {
727 struct bd2802_led *led = i2c_get_clientdata(client);
728 int i;
729
730 gpiod_set_value(led->reset, 1);
731 bd2802_unregister_led_classdev(led);
732 if (led->adf_on)
733 bd2802_disable_adv_conf(led);
734 for (i = 0; i < ARRAY_SIZE(bd2802_attributes); i++)
735 device_remove_file(&led->client->dev, bd2802_attributes[i]);
736
737 return 0;
738 }
739
740 #ifdef CONFIG_PM_SLEEP
bd2802_restore_state(struct bd2802_led * led)741 static void bd2802_restore_state(struct bd2802_led *led)
742 {
743 int i;
744
745 for (i = 0; i < LED_NUM; i++) {
746 if (led->led[i].r)
747 bd2802_turn_on(led, i, RED, led->led[i].r);
748 if (led->led[i].g)
749 bd2802_turn_on(led, i, GREEN, led->led[i].g);
750 if (led->led[i].b)
751 bd2802_turn_on(led, i, BLUE, led->led[i].b);
752 }
753 }
754
bd2802_suspend(struct device * dev)755 static int bd2802_suspend(struct device *dev)
756 {
757 struct i2c_client *client = to_i2c_client(dev);
758 struct bd2802_led *led = i2c_get_clientdata(client);
759
760 gpiod_set_value(led->reset, 1);
761
762 return 0;
763 }
764
bd2802_resume(struct device * dev)765 static int bd2802_resume(struct device *dev)
766 {
767 struct i2c_client *client = to_i2c_client(dev);
768 struct bd2802_led *led = i2c_get_clientdata(client);
769
770 if (!bd2802_is_all_off(led) || led->adf_on) {
771 bd2802_reset_cancel(led);
772 bd2802_restore_state(led);
773 }
774
775 return 0;
776 }
777 #endif
778
779 static SIMPLE_DEV_PM_OPS(bd2802_pm, bd2802_suspend, bd2802_resume);
780
781 static const struct i2c_device_id bd2802_id[] = {
782 { "BD2802", 0 },
783 { }
784 };
785 MODULE_DEVICE_TABLE(i2c, bd2802_id);
786
787 static struct i2c_driver bd2802_i2c_driver = {
788 .driver = {
789 .name = "BD2802",
790 .pm = &bd2802_pm,
791 },
792 .probe = bd2802_probe,
793 .remove = bd2802_remove,
794 .id_table = bd2802_id,
795 };
796
797 module_i2c_driver(bd2802_i2c_driver);
798
799 MODULE_AUTHOR("Kim Kyuwon <q1.kim@samsung.com>");
800 MODULE_DESCRIPTION("BD2802 LED driver");
801 MODULE_LICENSE("GPL v2");
802