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drm: Stop accessing encoder->bridge directly
[linux/fpc-iii.git] / drivers / leds / leds-bd2802.c
blobe7ec6bff2b5f0d1a798d085585e1395b104d08df
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * leds-bd2802.c - RGB LED Driver
4 *
5 * Copyright (C) 2009 Samsung Electronics
6 * Kim Kyuwon <q1.kim@samsung.com>
7 *
8 * Datasheet: http://www.rohm.com/products/databook/driver/pdf/bd2802gu-e.pdf
9 */
10
11 #include <linux/module.h>
12 #include <linux/i2c.h>
13 #include <linux/gpio.h>
14 #include <linux/delay.h>
15 #include <linux/leds.h>
16 #include <linux/leds-bd2802.h>
17 #include <linux/slab.h>
18 #include <linux/pm.h>
19
20 #define LED_CTL(rgb2en, rgb1en) ((rgb2en) << 4 | ((rgb1en) << 0))
21
22 #define BD2802_LED_OFFSET 0xa
23 #define BD2802_COLOR_OFFSET 0x3
24
25 #define BD2802_REG_CLKSETUP 0x00
26 #define BD2802_REG_CONTROL 0x01
27 #define BD2802_REG_HOURSETUP 0x02
28 #define BD2802_REG_CURRENT1SETUP 0x03
29 #define BD2802_REG_CURRENT2SETUP 0x04
30 #define BD2802_REG_WAVEPATTERN 0x05
31
32 #define BD2802_CURRENT_032 0x10 /* 3.2mA */
33 #define BD2802_CURRENT_000 0x00 /* 0.0mA */
34
35 #define BD2802_PATTERN_FULL 0x07
36 #define BD2802_PATTERN_HALF 0x03
37
38 enum led_ids {
39 LED1,
40 LED2,
41 LED_NUM,
42 };
43
44 enum led_colors {
45 RED,
46 GREEN,
47 BLUE,
48 };
49
50 enum led_bits {
51 BD2802_OFF,
52 BD2802_BLINK,
53 BD2802_ON,
54 };
55
56 /*
57 * State '0' : 'off'
58 * State '1' : 'blink'
59 * State '2' : 'on'.
60 */
61 struct led_state {
62 unsigned r:2;
63 unsigned g:2;
64 unsigned b:2;
65 };
66
67 struct bd2802_led {
68 struct bd2802_led_platform_data *pdata;
69 struct i2c_client *client;
70 struct rw_semaphore rwsem;
71
72 struct led_state led[2];
73
74 /*
75 * Making led_classdev as array is not recommended, because array
76 * members prevent using 'container_of' macro. So repetitive works
77 * are needed.
78 */
79 struct led_classdev cdev_led1r;
80 struct led_classdev cdev_led1g;
81 struct led_classdev cdev_led1b;
82 struct led_classdev cdev_led2r;
83 struct led_classdev cdev_led2g;
84 struct led_classdev cdev_led2b;
85
86 /*
87 * Advanced Configuration Function(ADF) mode:
88 * In ADF mode, user can set registers of BD2802GU directly,
89 * therefore BD2802GU doesn't enter reset state.
90 */
91 int adf_on;
92
93 enum led_ids led_id;
94 enum led_colors color;
95 enum led_bits state;
96
97 /* General attributes of RGB LEDs */
98 int wave_pattern;
99 int rgb_current;
100 };
101
102
103 /*--------------------------------------------------------------*/
104 /* BD2802GU helper functions */
105 /*--------------------------------------------------------------*/
106
107 static inline int bd2802_is_rgb_off(struct bd2802_led *led, enum led_ids id,
108 enum led_colors color)
109 {
110 switch (color) {
111 case RED:
112 return !led->led[id].r;
113 case GREEN:
114 return !led->led[id].g;
115 case BLUE:
116 return !led->led[id].b;
117 default:
118 dev_err(&led->client->dev, "%s: Invalid color\n", __func__);
119 return -EINVAL;
120 }
121 }
122
123 static inline int bd2802_is_led_off(struct bd2802_led *led, enum led_ids id)
124 {
125 if (led->led[id].r || led->led[id].g || led->led[id].b)
126 return 0;
127
128 return 1;
129 }
130
131 static inline int bd2802_is_all_off(struct bd2802_led *led)
132 {
133 int i;
134
135 for (i = 0; i < LED_NUM; i++)
136 if (!bd2802_is_led_off(led, i))
137 return 0;
138
139 return 1;
140 }
141
142 static inline u8 bd2802_get_base_offset(enum led_ids id, enum led_colors color)
143 {
144 return id * BD2802_LED_OFFSET + color * BD2802_COLOR_OFFSET;
145 }
146
147 static inline u8 bd2802_get_reg_addr(enum led_ids id, enum led_colors color,
148 u8 reg_offset)
149 {
150 return reg_offset + bd2802_get_base_offset(id, color);
151 }
152
153
154 /*--------------------------------------------------------------*/
155 /* BD2802GU core functions */
156 /*--------------------------------------------------------------*/
157
158 static int bd2802_write_byte(struct i2c_client *client, u8 reg, u8 val)
159 {
160 int ret = i2c_smbus_write_byte_data(client, reg, val);
161 if (ret >= 0)
162 return 0;
163
164 dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n",
165 __func__, reg, val, ret);
166
167 return ret;
168 }
169
170 static void bd2802_update_state(struct bd2802_led *led, enum led_ids id,
171 enum led_colors color, enum led_bits led_bit)
172 {
173 int i;
174 u8 value;
175
176 for (i = 0; i < LED_NUM; i++) {
177 if (i == id) {
178 switch (color) {
179 case RED:
180 led->led[i].r = led_bit;
181 break;
182 case GREEN:
183 led->led[i].g = led_bit;
184 break;
185 case BLUE:
186 led->led[i].b = led_bit;
187 break;
188 default:
189 dev_err(&led->client->dev,
190 "%s: Invalid color\n", __func__);
191 return;
192 }
193 }
194 }
195
196 if (led_bit == BD2802_BLINK || led_bit == BD2802_ON)
197 return;
198
199 if (!bd2802_is_led_off(led, id))
200 return;
201
202 if (bd2802_is_all_off(led) && !led->adf_on) {
203 gpio_set_value(led->pdata->reset_gpio, 0);
204 return;
205 }
206
207 /*
208 * In this case, other led is turned on, and current led is turned
209 * off. So set RGB LED Control register to stop the current RGB LED
210 */
211 value = (id == LED1) ? LED_CTL(1, 0) : LED_CTL(0, 1);
212 bd2802_write_byte(led->client, BD2802_REG_CONTROL, value);
213 }
214
215 static void bd2802_configure(struct bd2802_led *led)
216 {
217 struct bd2802_led_platform_data *pdata = led->pdata;
218 u8 reg;
219
220 reg = bd2802_get_reg_addr(LED1, RED, BD2802_REG_HOURSETUP);
221 bd2802_write_byte(led->client, reg, pdata->rgb_time);
222
223 reg = bd2802_get_reg_addr(LED2, RED, BD2802_REG_HOURSETUP);
224 bd2802_write_byte(led->client, reg, pdata->rgb_time);
225 }
226
227 static void bd2802_reset_cancel(struct bd2802_led *led)
228 {
229 gpio_set_value(led->pdata->reset_gpio, 1);
230 udelay(100);
231 bd2802_configure(led);
232 }
233
234 static void bd2802_enable(struct bd2802_led *led, enum led_ids id)
235 {
236 enum led_ids other_led = (id == LED1) ? LED2 : LED1;
237 u8 value, other_led_on;
238
239 other_led_on = !bd2802_is_led_off(led, other_led);
240 if (id == LED1)
241 value = LED_CTL(other_led_on, 1);
242 else
243 value = LED_CTL(1 , other_led_on);
244
245 bd2802_write_byte(led->client, BD2802_REG_CONTROL, value);
246 }
247
248 static void bd2802_set_on(struct bd2802_led *led, enum led_ids id,
249 enum led_colors color)
250 {
251 u8 reg;
252
253 if (bd2802_is_all_off(led) && !led->adf_on)
254 bd2802_reset_cancel(led);
255
256 reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT1SETUP);
257 bd2802_write_byte(led->client, reg, led->rgb_current);
258 reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT2SETUP);
259 bd2802_write_byte(led->client, reg, BD2802_CURRENT_000);
260 reg = bd2802_get_reg_addr(id, color, BD2802_REG_WAVEPATTERN);
261 bd2802_write_byte(led->client, reg, BD2802_PATTERN_FULL);
262
263 bd2802_enable(led, id);
264 bd2802_update_state(led, id, color, BD2802_ON);
265 }
266
267 static void bd2802_set_blink(struct bd2802_led *led, enum led_ids id,
268 enum led_colors color)
269 {
270 u8 reg;
271
272 if (bd2802_is_all_off(led) && !led->adf_on)
273 bd2802_reset_cancel(led);
274
275 reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT1SETUP);
276 bd2802_write_byte(led->client, reg, BD2802_CURRENT_000);
277 reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT2SETUP);
278 bd2802_write_byte(led->client, reg, led->rgb_current);
279 reg = bd2802_get_reg_addr(id, color, BD2802_REG_WAVEPATTERN);
280 bd2802_write_byte(led->client, reg, led->wave_pattern);
281
282 bd2802_enable(led, id);
283 bd2802_update_state(led, id, color, BD2802_BLINK);
284 }
285
286 static void bd2802_turn_on(struct bd2802_led *led, enum led_ids id,
287 enum led_colors color, enum led_bits led_bit)
288 {
289 if (led_bit == BD2802_OFF) {
290 dev_err(&led->client->dev,
291 "Only 'blink' and 'on' are allowed\n");
292 return;
293 }
294
295 if (led_bit == BD2802_BLINK)
296 bd2802_set_blink(led, id, color);
297 else
298 bd2802_set_on(led, id, color);
299 }
300
301 static void bd2802_turn_off(struct bd2802_led *led, enum led_ids id,
302 enum led_colors color)
303 {
304 u8 reg;
305
306 if (bd2802_is_rgb_off(led, id, color))
307 return;
308
309 reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT1SETUP);
310 bd2802_write_byte(led->client, reg, BD2802_CURRENT_000);
311 reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT2SETUP);
312 bd2802_write_byte(led->client, reg, BD2802_CURRENT_000);
313
314 bd2802_update_state(led, id, color, BD2802_OFF);
315 }
316
317 #define BD2802_SET_REGISTER(reg_addr, reg_name) \
318 static ssize_t bd2802_store_reg##reg_addr(struct device *dev, \
319 struct device_attribute *attr, const char *buf, size_t count) \
320 { \
321 struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\
322 unsigned long val; \
323 int ret; \
324 if (!count) \
325 return -EINVAL; \
326 ret = kstrtoul(buf, 16, &val); \
327 if (ret) \
328 return ret; \
329 down_write(&led->rwsem); \
330 bd2802_write_byte(led->client, reg_addr, (u8) val); \
331 up_write(&led->rwsem); \
332 return count; \
333 } \
334 static struct device_attribute bd2802_reg##reg_addr##_attr = { \
335 .attr = {.name = reg_name, .mode = 0644}, \
336 .store = bd2802_store_reg##reg_addr, \
337 };
338
339 BD2802_SET_REGISTER(0x00, "0x00");
340 BD2802_SET_REGISTER(0x01, "0x01");
341 BD2802_SET_REGISTER(0x02, "0x02");
342 BD2802_SET_REGISTER(0x03, "0x03");
343 BD2802_SET_REGISTER(0x04, "0x04");
344 BD2802_SET_REGISTER(0x05, "0x05");
345 BD2802_SET_REGISTER(0x06, "0x06");
346 BD2802_SET_REGISTER(0x07, "0x07");
347 BD2802_SET_REGISTER(0x08, "0x08");
348 BD2802_SET_REGISTER(0x09, "0x09");
349 BD2802_SET_REGISTER(0x0a, "0x0a");
350 BD2802_SET_REGISTER(0x0b, "0x0b");
351 BD2802_SET_REGISTER(0x0c, "0x0c");
352 BD2802_SET_REGISTER(0x0d, "0x0d");
353 BD2802_SET_REGISTER(0x0e, "0x0e");
354 BD2802_SET_REGISTER(0x0f, "0x0f");
355 BD2802_SET_REGISTER(0x10, "0x10");
356 BD2802_SET_REGISTER(0x11, "0x11");
357 BD2802_SET_REGISTER(0x12, "0x12");
358 BD2802_SET_REGISTER(0x13, "0x13");
359 BD2802_SET_REGISTER(0x14, "0x14");
360 BD2802_SET_REGISTER(0x15, "0x15");
361
362 static struct device_attribute *bd2802_addr_attributes[] = {
363 &bd2802_reg0x00_attr,
364 &bd2802_reg0x01_attr,
365 &bd2802_reg0x02_attr,
366 &bd2802_reg0x03_attr,
367 &bd2802_reg0x04_attr,
368 &bd2802_reg0x05_attr,
369 &bd2802_reg0x06_attr,
370 &bd2802_reg0x07_attr,
371 &bd2802_reg0x08_attr,
372 &bd2802_reg0x09_attr,
373 &bd2802_reg0x0a_attr,
374 &bd2802_reg0x0b_attr,
375 &bd2802_reg0x0c_attr,
376 &bd2802_reg0x0d_attr,
377 &bd2802_reg0x0e_attr,
378 &bd2802_reg0x0f_attr,
379 &bd2802_reg0x10_attr,
380 &bd2802_reg0x11_attr,
381 &bd2802_reg0x12_attr,
382 &bd2802_reg0x13_attr,
383 &bd2802_reg0x14_attr,
384 &bd2802_reg0x15_attr,
385 };
386
387 static void bd2802_enable_adv_conf(struct bd2802_led *led)
388 {
389 int i, ret;
390
391 for (i = 0; i < ARRAY_SIZE(bd2802_addr_attributes); i++) {
392 ret = device_create_file(&led->client->dev,
393 bd2802_addr_attributes[i]);
394 if (ret) {
395 dev_err(&led->client->dev, "failed: sysfs file %s\n",
396 bd2802_addr_attributes[i]->attr.name);
397 goto failed_remove_files;
398 }
399 }
400
401 if (bd2802_is_all_off(led))
402 bd2802_reset_cancel(led);
403
404 led->adf_on = 1;
405
406 return;
407
408 failed_remove_files:
409 for (i--; i >= 0; i--)
410 device_remove_file(&led->client->dev,
411 bd2802_addr_attributes[i]);
412 }
413
414 static void bd2802_disable_adv_conf(struct bd2802_led *led)
415 {
416 int i;
417
418 for (i = 0; i < ARRAY_SIZE(bd2802_addr_attributes); i++)
419 device_remove_file(&led->client->dev,
420 bd2802_addr_attributes[i]);
421
422 if (bd2802_is_all_off(led))
423 gpio_set_value(led->pdata->reset_gpio, 0);
424
425 led->adf_on = 0;
426 }
427
428 static ssize_t bd2802_show_adv_conf(struct device *dev,
429 struct device_attribute *attr, char *buf)
430 {
431 struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));
432 ssize_t ret;
433
434 down_read(&led->rwsem);
435 if (led->adf_on)
436 ret = sprintf(buf, "on\n");
437 else
438 ret = sprintf(buf, "off\n");
439 up_read(&led->rwsem);
440
441 return ret;
442 }
443
444 static ssize_t bd2802_store_adv_conf(struct device *dev,
445 struct device_attribute *attr, const char *buf, size_t count)
446 {
447 struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));
448
449 if (!count)
450 return -EINVAL;
451
452 down_write(&led->rwsem);
453 if (!led->adf_on && !strncmp(buf, "on", 2))
454 bd2802_enable_adv_conf(led);
455 else if (led->adf_on && !strncmp(buf, "off", 3))
456 bd2802_disable_adv_conf(led);
457 up_write(&led->rwsem);
458
459 return count;
460 }
461
462 static struct device_attribute bd2802_adv_conf_attr = {
463 .attr = {
464 .name = "advanced_configuration",
465 .mode = 0644,
466 },
467 .show = bd2802_show_adv_conf,
468 .store = bd2802_store_adv_conf,
469 };
470
471 #define BD2802_CONTROL_ATTR(attr_name, name_str) \
472 static ssize_t bd2802_show_##attr_name(struct device *dev, \
473 struct device_attribute *attr, char *buf) \
474 { \
475 struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\
476 ssize_t ret; \
477 down_read(&led->rwsem); \
478 ret = sprintf(buf, "0x%02x\n", led->attr_name); \
479 up_read(&led->rwsem); \
480 return ret; \
481 } \
482 static ssize_t bd2802_store_##attr_name(struct device *dev, \
483 struct device_attribute *attr, const char *buf, size_t count) \
484 { \
485 struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\
486 unsigned long val; \
487 int ret; \
488 if (!count) \
489 return -EINVAL; \
490 ret = kstrtoul(buf, 16, &val); \
491 if (ret) \
492 return ret; \
493 down_write(&led->rwsem); \
494 led->attr_name = val; \
495 up_write(&led->rwsem); \
496 return count; \
497 } \
498 static struct device_attribute bd2802_##attr_name##_attr = { \
499 .attr = { \
500 .name = name_str, \
501 .mode = 0644, \
502 }, \
503 .show = bd2802_show_##attr_name, \
504 .store = bd2802_store_##attr_name, \
505 };
506
507 BD2802_CONTROL_ATTR(wave_pattern, "wave_pattern");
508 BD2802_CONTROL_ATTR(rgb_current, "rgb_current");
509
510 static struct device_attribute *bd2802_attributes[] = {
511 &bd2802_adv_conf_attr,
512 &bd2802_wave_pattern_attr,
513 &bd2802_rgb_current_attr,
514 };
515
516 #define BD2802_CONTROL_RGBS(name, id, clr) \
517 static int bd2802_set_##name##_brightness(struct led_classdev *led_cdev,\
518 enum led_brightness value) \
519 { \
520 struct bd2802_led *led = \
521 container_of(led_cdev, struct bd2802_led, cdev_##name); \
522 led->led_id = id; \
523 led->color = clr; \
524 if (value == LED_OFF) { \
525 led->state = BD2802_OFF; \
526 bd2802_turn_off(led, led->led_id, led->color); \
527 } else { \
528 led->state = BD2802_ON; \
529 bd2802_turn_on(led, led->led_id, led->color, BD2802_ON);\
530 } \
531 return 0; \
532 } \
533 static int bd2802_set_##name##_blink(struct led_classdev *led_cdev, \
534 unsigned long *delay_on, unsigned long *delay_off) \
535 { \
536 struct bd2802_led *led = \
537 container_of(led_cdev, struct bd2802_led, cdev_##name); \
538 if (*delay_on == 0 || *delay_off == 0) \
539 return -EINVAL; \
540 led->led_id = id; \
541 led->color = clr; \
542 led->state = BD2802_BLINK; \
543 bd2802_turn_on(led, led->led_id, led->color, BD2802_BLINK); \
544 return 0; \
545 }
546
547 BD2802_CONTROL_RGBS(led1r, LED1, RED);
548 BD2802_CONTROL_RGBS(led1g, LED1, GREEN);
549 BD2802_CONTROL_RGBS(led1b, LED1, BLUE);
550 BD2802_CONTROL_RGBS(led2r, LED2, RED);
551 BD2802_CONTROL_RGBS(led2g, LED2, GREEN);
552 BD2802_CONTROL_RGBS(led2b, LED2, BLUE);
553
554 static int bd2802_register_led_classdev(struct bd2802_led *led)
555 {
556 int ret;
557
558 led->cdev_led1r.name = "led1_R";
559 led->cdev_led1r.brightness = LED_OFF;
560 led->cdev_led1r.brightness_set_blocking = bd2802_set_led1r_brightness;
561 led->cdev_led1r.blink_set = bd2802_set_led1r_blink;
562
563 ret = led_classdev_register(&led->client->dev, &led->cdev_led1r);
564 if (ret < 0) {
565 dev_err(&led->client->dev, "couldn't register LED %s\n",
566 led->cdev_led1r.name);
567 goto failed_unregister_led1_R;
568 }
569
570 led->cdev_led1g.name = "led1_G";
571 led->cdev_led1g.brightness = LED_OFF;
572 led->cdev_led1g.brightness_set_blocking = bd2802_set_led1g_brightness;
573 led->cdev_led1g.blink_set = bd2802_set_led1g_blink;
574
575 ret = led_classdev_register(&led->client->dev, &led->cdev_led1g);
576 if (ret < 0) {
577 dev_err(&led->client->dev, "couldn't register LED %s\n",
578 led->cdev_led1g.name);
579 goto failed_unregister_led1_G;
580 }
581
582 led->cdev_led1b.name = "led1_B";
583 led->cdev_led1b.brightness = LED_OFF;
584 led->cdev_led1b.brightness_set_blocking = bd2802_set_led1b_brightness;
585 led->cdev_led1b.blink_set = bd2802_set_led1b_blink;
586
587 ret = led_classdev_register(&led->client->dev, &led->cdev_led1b);
588 if (ret < 0) {
589 dev_err(&led->client->dev, "couldn't register LED %s\n",
590 led->cdev_led1b.name);
591 goto failed_unregister_led1_B;
592 }
593
594 led->cdev_led2r.name = "led2_R";
595 led->cdev_led2r.brightness = LED_OFF;
596 led->cdev_led2r.brightness_set_blocking = bd2802_set_led2r_brightness;
597 led->cdev_led2r.blink_set = bd2802_set_led2r_blink;
598
599 ret = led_classdev_register(&led->client->dev, &led->cdev_led2r);
600 if (ret < 0) {
601 dev_err(&led->client->dev, "couldn't register LED %s\n",
602 led->cdev_led2r.name);
603 goto failed_unregister_led2_R;
604 }
605
606 led->cdev_led2g.name = "led2_G";
607 led->cdev_led2g.brightness = LED_OFF;
608 led->cdev_led2g.brightness_set_blocking = bd2802_set_led2g_brightness;
609 led->cdev_led2g.blink_set = bd2802_set_led2g_blink;
610
611 ret = led_classdev_register(&led->client->dev, &led->cdev_led2g);
612 if (ret < 0) {
613 dev_err(&led->client->dev, "couldn't register LED %s\n",
614 led->cdev_led2g.name);
615 goto failed_unregister_led2_G;
616 }
617
618 led->cdev_led2b.name = "led2_B";
619 led->cdev_led2b.brightness = LED_OFF;
620 led->cdev_led2b.brightness_set_blocking = bd2802_set_led2b_brightness;
621 led->cdev_led2b.blink_set = bd2802_set_led2b_blink;
622 led->cdev_led2b.flags |= LED_CORE_SUSPENDRESUME;
623
624 ret = led_classdev_register(&led->client->dev, &led->cdev_led2b);
625 if (ret < 0) {
626 dev_err(&led->client->dev, "couldn't register LED %s\n",
627 led->cdev_led2b.name);
628 goto failed_unregister_led2_B;
629 }
630
631 return 0;
632
633 failed_unregister_led2_B:
634 led_classdev_unregister(&led->cdev_led2g);
635 failed_unregister_led2_G:
636 led_classdev_unregister(&led->cdev_led2r);
637 failed_unregister_led2_R:
638 led_classdev_unregister(&led->cdev_led1b);
639 failed_unregister_led1_B:
640 led_classdev_unregister(&led->cdev_led1g);
641 failed_unregister_led1_G:
642 led_classdev_unregister(&led->cdev_led1r);
643 failed_unregister_led1_R:
644
645 return ret;
646 }
647
648 static void bd2802_unregister_led_classdev(struct bd2802_led *led)
649 {
650 led_classdev_unregister(&led->cdev_led2b);
651 led_classdev_unregister(&led->cdev_led2g);
652 led_classdev_unregister(&led->cdev_led2r);
653 led_classdev_unregister(&led->cdev_led1b);
654 led_classdev_unregister(&led->cdev_led1g);
655 led_classdev_unregister(&led->cdev_led1r);
656 }
657
658 static int bd2802_probe(struct i2c_client *client,
659 const struct i2c_device_id *id)
660 {
661 struct bd2802_led *led;
662 struct bd2802_led_platform_data *pdata;
663 int ret, i;
664
665 led = devm_kzalloc(&client->dev, sizeof(struct bd2802_led), GFP_KERNEL);
666 if (!led)
667 return -ENOMEM;
668
669 led->client = client;
670 pdata = led->pdata = dev_get_platdata(&client->dev);
671 i2c_set_clientdata(client, led);
672
673 /* Configure RESET GPIO (L: RESET, H: RESET cancel) */
674 gpio_request_one(pdata->reset_gpio, GPIOF_OUT_INIT_HIGH, "RGB_RESETB");
675
676 /* Tacss = min 0.1ms */
677 udelay(100);
678
679 /* Detect BD2802GU */
680 ret = bd2802_write_byte(client, BD2802_REG_CLKSETUP, 0x00);
681 if (ret < 0) {
682 dev_err(&client->dev, "failed to detect device\n");
683 return ret;
684 } else
685 dev_info(&client->dev, "return 0x%02x\n", ret);
686
687 /* To save the power, reset BD2802 after detecting */
688 gpio_set_value(led->pdata->reset_gpio, 0);
689
690 /* Default attributes */
691 led->wave_pattern = BD2802_PATTERN_HALF;
692 led->rgb_current = BD2802_CURRENT_032;
693
694 init_rwsem(&led->rwsem);
695
696 for (i = 0; i < ARRAY_SIZE(bd2802_attributes); i++) {
697 ret = device_create_file(&led->client->dev,
698 bd2802_attributes[i]);
699 if (ret) {
700 dev_err(&led->client->dev, "failed: sysfs file %s\n",
701 bd2802_attributes[i]->attr.name);
702 goto failed_unregister_dev_file;
703 }
704 }
705
706 ret = bd2802_register_led_classdev(led);
707 if (ret < 0)
708 goto failed_unregister_dev_file;
709
710 return 0;
711
712 failed_unregister_dev_file:
713 for (i--; i >= 0; i--)
714 device_remove_file(&led->client->dev, bd2802_attributes[i]);
715 return ret;
716 }
717
718 static int bd2802_remove(struct i2c_client *client)
719 {
720 struct bd2802_led *led = i2c_get_clientdata(client);
721 int i;
722
723 gpio_set_value(led->pdata->reset_gpio, 0);
724 bd2802_unregister_led_classdev(led);
725 if (led->adf_on)
726 bd2802_disable_adv_conf(led);
727 for (i = 0; i < ARRAY_SIZE(bd2802_attributes); i++)
728 device_remove_file(&led->client->dev, bd2802_attributes[i]);
729
730 return 0;
731 }
732
733 #ifdef CONFIG_PM_SLEEP
734 static void bd2802_restore_state(struct bd2802_led *led)
735 {
736 int i;
737
738 for (i = 0; i < LED_NUM; i++) {
739 if (led->led[i].r)
740 bd2802_turn_on(led, i, RED, led->led[i].r);
741 if (led->led[i].g)
742 bd2802_turn_on(led, i, GREEN, led->led[i].g);
743 if (led->led[i].b)
744 bd2802_turn_on(led, i, BLUE, led->led[i].b);
745 }
746 }
747
748 static int bd2802_suspend(struct device *dev)
749 {
750 struct i2c_client *client = to_i2c_client(dev);
751 struct bd2802_led *led = i2c_get_clientdata(client);
752
753 gpio_set_value(led->pdata->reset_gpio, 0);
754
755 return 0;
756 }
757
758 static int bd2802_resume(struct device *dev)
759 {
760 struct i2c_client *client = to_i2c_client(dev);
761 struct bd2802_led *led = i2c_get_clientdata(client);
762
763 if (!bd2802_is_all_off(led) || led->adf_on) {
764 bd2802_reset_cancel(led);
765 bd2802_restore_state(led);
766 }
767
768 return 0;
769 }
770 #endif
771
772 static SIMPLE_DEV_PM_OPS(bd2802_pm, bd2802_suspend, bd2802_resume);
773
774 static const struct i2c_device_id bd2802_id[] = {
775 { "BD2802", 0 },
776 { }
777 };
778 MODULE_DEVICE_TABLE(i2c, bd2802_id);
779
780 static struct i2c_driver bd2802_i2c_driver = {
781 .driver = {
782 .name = "BD2802",
783 .pm = &bd2802_pm,
784 },
785 .probe = bd2802_probe,
786 .remove = bd2802_remove,
787 .id_table = bd2802_id,
788 };
789
790 module_i2c_driver(bd2802_i2c_driver);
791
792 MODULE_AUTHOR("Kim Kyuwon <q1.kim@samsung.com>");
793 MODULE_DESCRIPTION("BD2802 LED driver");
794 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support