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Merge tag 'chrome-platform-for-linus-4.13' of git://git.kernel.org/pub/scm/linux...
[linux/fpc-iii.git] / drivers / leds / leds-lp8860.c
blob3e70775a2d54eaab717f5e61a4f3580bd28a492d
1 /*
2 * TI LP8860 4-Channel LED Driver
3 *
4 * Copyright (C) 2014 Texas Instruments
5 *
6 * Author: Dan Murphy <dmurphy@ti.com>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * version 2 as published by the Free Software Foundation.
11 *
12 */
13
14 #include <linux/i2c.h>
15 #include <linux/init.h>
16 #include <linux/leds.h>
17 #include <linux/regmap.h>
18 #include <linux/regulator/consumer.h>
19 #include <linux/module.h>
20 #include <linux/mutex.h>
21 #include <linux/of.h>
22 #include <linux/of_gpio.h>
23 #include <linux/gpio/consumer.h>
24 #include <linux/slab.h>
25
26 #define LP8860_DISP_CL1_BRT_MSB 0x00
27 #define LP8860_DISP_CL1_BRT_LSB 0x01
28 #define LP8860_DISP_CL1_CURR_MSB 0x02
29 #define LP8860_DISP_CL1_CURR_LSB 0x03
30 #define LP8860_CL2_BRT_MSB 0x04
31 #define LP8860_CL2_BRT_LSB 0x05
32 #define LP8860_CL2_CURRENT 0x06
33 #define LP8860_CL3_BRT_MSB 0x07
34 #define LP8860_CL3_BRT_LSB 0x08
35 #define LP8860_CL3_CURRENT 0x09
36 #define LP8860_CL4_BRT_MSB 0x0a
37 #define LP8860_CL4_BRT_LSB 0x0b
38 #define LP8860_CL4_CURRENT 0x0c
39 #define LP8860_CONFIG 0x0d
40 #define LP8860_STATUS 0x0e
41 #define LP8860_FAULT 0x0f
42 #define LP8860_LED_FAULT 0x10
43 #define LP8860_FAULT_CLEAR 0x11
44 #define LP8860_ID 0x12
45 #define LP8860_TEMP_MSB 0x13
46 #define LP8860_TEMP_LSB 0x14
47 #define LP8860_DISP_LED_CURR_MSB 0x15
48 #define LP8860_DISP_LED_CURR_LSB 0x16
49 #define LP8860_DISP_LED_PWM_MSB 0x17
50 #define LP8860_DISP_LED_PWM_LSB 0x18
51 #define LP8860_EEPROM_CNTRL 0x19
52 #define LP8860_EEPROM_UNLOCK 0x1a
53
54 #define LP8860_EEPROM_REG_0 0x60
55 #define LP8860_EEPROM_REG_1 0x61
56 #define LP8860_EEPROM_REG_2 0x62
57 #define LP8860_EEPROM_REG_3 0x63
58 #define LP8860_EEPROM_REG_4 0x64
59 #define LP8860_EEPROM_REG_5 0x65
60 #define LP8860_EEPROM_REG_6 0x66
61 #define LP8860_EEPROM_REG_7 0x67
62 #define LP8860_EEPROM_REG_8 0x68
63 #define LP8860_EEPROM_REG_9 0x69
64 #define LP8860_EEPROM_REG_10 0x6a
65 #define LP8860_EEPROM_REG_11 0x6b
66 #define LP8860_EEPROM_REG_12 0x6c
67 #define LP8860_EEPROM_REG_13 0x6d
68 #define LP8860_EEPROM_REG_14 0x6e
69 #define LP8860_EEPROM_REG_15 0x6f
70 #define LP8860_EEPROM_REG_16 0x70
71 #define LP8860_EEPROM_REG_17 0x71
72 #define LP8860_EEPROM_REG_18 0x72
73 #define LP8860_EEPROM_REG_19 0x73
74 #define LP8860_EEPROM_REG_20 0x74
75 #define LP8860_EEPROM_REG_21 0x75
76 #define LP8860_EEPROM_REG_22 0x76
77 #define LP8860_EEPROM_REG_23 0x77
78 #define LP8860_EEPROM_REG_24 0x78
79
80 #define LP8860_LOCK_EEPROM 0x00
81 #define LP8860_UNLOCK_EEPROM 0x01
82 #define LP8860_PROGRAM_EEPROM 0x02
83 #define LP8860_EEPROM_CODE_1 0x08
84 #define LP8860_EEPROM_CODE_2 0xba
85 #define LP8860_EEPROM_CODE_3 0xef
86
87 #define LP8860_CLEAR_FAULTS 0x01
88
89 #define LP8860_DISP_LED_NAME "display_cluster"
90
91 /**
92 * struct lp8860_led -
93 * @lock - Lock for reading/writing the device
94 * @client - Pointer to the I2C client
95 * @led_dev - led class device pointer
96 * @regmap - Devices register map
97 * @eeprom_regmap - EEPROM register map
98 * @enable_gpio - VDDIO/EN gpio to enable communication interface
99 * @regulator - LED supply regulator pointer
100 * @label - LED label
101 **/
102 struct lp8860_led {
103 struct mutex lock;
104 struct i2c_client *client;
105 struct led_classdev led_dev;
106 struct regmap *regmap;
107 struct regmap *eeprom_regmap;
108 struct gpio_desc *enable_gpio;
109 struct regulator *regulator;
110 const char *label;
111 };
112
113 struct lp8860_eeprom_reg {
114 uint8_t reg;
115 uint8_t value;
116 };
117
118 static struct lp8860_eeprom_reg lp8860_eeprom_disp_regs[] = {
119 { LP8860_EEPROM_REG_0, 0xed },
120 { LP8860_EEPROM_REG_1, 0xdf },
121 { LP8860_EEPROM_REG_2, 0xdc },
122 { LP8860_EEPROM_REG_3, 0xf0 },
123 { LP8860_EEPROM_REG_4, 0xdf },
124 { LP8860_EEPROM_REG_5, 0xe5 },
125 { LP8860_EEPROM_REG_6, 0xf2 },
126 { LP8860_EEPROM_REG_7, 0x77 },
127 { LP8860_EEPROM_REG_8, 0x77 },
128 { LP8860_EEPROM_REG_9, 0x71 },
129 { LP8860_EEPROM_REG_10, 0x3f },
130 { LP8860_EEPROM_REG_11, 0xb7 },
131 { LP8860_EEPROM_REG_12, 0x17 },
132 { LP8860_EEPROM_REG_13, 0xef },
133 { LP8860_EEPROM_REG_14, 0xb0 },
134 { LP8860_EEPROM_REG_15, 0x87 },
135 { LP8860_EEPROM_REG_16, 0xce },
136 { LP8860_EEPROM_REG_17, 0x72 },
137 { LP8860_EEPROM_REG_18, 0xe5 },
138 { LP8860_EEPROM_REG_19, 0xdf },
139 { LP8860_EEPROM_REG_20, 0x35 },
140 { LP8860_EEPROM_REG_21, 0x06 },
141 { LP8860_EEPROM_REG_22, 0xdc },
142 { LP8860_EEPROM_REG_23, 0x88 },
143 { LP8860_EEPROM_REG_24, 0x3E },
144 };
145
146 static int lp8860_unlock_eeprom(struct lp8860_led *led, int lock)
147 {
148 int ret;
149
150 mutex_lock(&led->lock);
151
152 if (lock == LP8860_UNLOCK_EEPROM) {
153 ret = regmap_write(led->regmap,
154 LP8860_EEPROM_UNLOCK,
155 LP8860_EEPROM_CODE_1);
156 if (ret) {
157 dev_err(&led->client->dev, "EEPROM Unlock failed\n");
158 goto out;
159 }
160
161 ret = regmap_write(led->regmap,
162 LP8860_EEPROM_UNLOCK,
163 LP8860_EEPROM_CODE_2);
164 if (ret) {
165 dev_err(&led->client->dev, "EEPROM Unlock failed\n");
166 goto out;
167 }
168 ret = regmap_write(led->regmap,
169 LP8860_EEPROM_UNLOCK,
170 LP8860_EEPROM_CODE_3);
171 if (ret) {
172 dev_err(&led->client->dev, "EEPROM Unlock failed\n");
173 goto out;
174 }
175 } else {
176 ret = regmap_write(led->regmap,
177 LP8860_EEPROM_UNLOCK,
178 LP8860_LOCK_EEPROM);
179 }
180
181 out:
182 mutex_unlock(&led->lock);
183 return ret;
184 }
185
186 static int lp8860_fault_check(struct lp8860_led *led)
187 {
188 int ret, fault;
189 unsigned int read_buf;
190
191 ret = regmap_read(led->regmap, LP8860_LED_FAULT, &read_buf);
192 if (ret)
193 goto out;
194
195 fault = read_buf;
196
197 ret = regmap_read(led->regmap, LP8860_FAULT, &read_buf);
198 if (ret)
199 goto out;
200
201 fault |= read_buf;
202
203 /* Attempt to clear any faults */
204 if (fault)
205 ret = regmap_write(led->regmap, LP8860_FAULT_CLEAR,
206 LP8860_CLEAR_FAULTS);
207 out:
208 return ret;
209 }
210
211 static int lp8860_brightness_set(struct led_classdev *led_cdev,
212 enum led_brightness brt_val)
213 {
214 struct lp8860_led *led =
215 container_of(led_cdev, struct lp8860_led, led_dev);
216 int disp_brightness = brt_val * 255;
217 int ret;
218
219 mutex_lock(&led->lock);
220
221 ret = lp8860_fault_check(led);
222 if (ret) {
223 dev_err(&led->client->dev, "Cannot read/clear faults\n");
224 goto out;
225 }
226
227 ret = regmap_write(led->regmap, LP8860_DISP_CL1_BRT_MSB,
228 (disp_brightness & 0xff00) >> 8);
229 if (ret) {
230 dev_err(&led->client->dev, "Cannot write CL1 MSB\n");
231 goto out;
232 }
233
234 ret = regmap_write(led->regmap, LP8860_DISP_CL1_BRT_LSB,
235 disp_brightness & 0xff);
236 if (ret) {
237 dev_err(&led->client->dev, "Cannot write CL1 LSB\n");
238 goto out;
239 }
240 out:
241 mutex_unlock(&led->lock);
242 return ret;
243 }
244
245 static int lp8860_init(struct lp8860_led *led)
246 {
247 unsigned int read_buf;
248 int ret, i, reg_count;
249
250 if (led->enable_gpio)
251 gpiod_direction_output(led->enable_gpio, 1);
252
253 ret = lp8860_fault_check(led);
254 if (ret)
255 goto out;
256
257 ret = regmap_read(led->regmap, LP8860_STATUS, &read_buf);
258 if (ret)
259 goto out;
260
261 ret = lp8860_unlock_eeprom(led, LP8860_UNLOCK_EEPROM);
262 if (ret) {
263 dev_err(&led->client->dev, "Failed unlocking EEPROM\n");
264 goto out;
265 }
266
267 reg_count = ARRAY_SIZE(lp8860_eeprom_disp_regs) / sizeof(lp8860_eeprom_disp_regs[0]);
268 for (i = 0; i < reg_count; i++) {
269 ret = regmap_write(led->eeprom_regmap,
270 lp8860_eeprom_disp_regs[i].reg,
271 lp8860_eeprom_disp_regs[i].value);
272 if (ret) {
273 dev_err(&led->client->dev, "Failed writing EEPROM\n");
274 goto out;
275 }
276 }
277
278 ret = lp8860_unlock_eeprom(led, LP8860_LOCK_EEPROM);
279 if (ret)
280 goto out;
281
282 ret = regmap_write(led->regmap,
283 LP8860_EEPROM_CNTRL,
284 LP8860_PROGRAM_EEPROM);
285 if (ret)
286 dev_err(&led->client->dev, "Failed programming EEPROM\n");
287 out:
288 if (ret)
289 if (led->enable_gpio)
290 gpiod_direction_output(led->enable_gpio, 0);
291 return ret;
292 }
293
294 static const struct reg_default lp8860_reg_defs[] = {
295 { LP8860_DISP_CL1_BRT_MSB, 0x00},
296 { LP8860_DISP_CL1_BRT_LSB, 0x00},
297 { LP8860_DISP_CL1_CURR_MSB, 0x00},
298 { LP8860_DISP_CL1_CURR_LSB, 0x00},
299 { LP8860_CL2_BRT_MSB, 0x00},
300 { LP8860_CL2_BRT_LSB, 0x00},
301 { LP8860_CL2_CURRENT, 0x00},
302 { LP8860_CL3_BRT_MSB, 0x00},
303 { LP8860_CL3_BRT_LSB, 0x00},
304 { LP8860_CL3_CURRENT, 0x00},
305 { LP8860_CL4_BRT_MSB, 0x00},
306 { LP8860_CL4_BRT_LSB, 0x00},
307 { LP8860_CL4_CURRENT, 0x00},
308 { LP8860_CONFIG, 0x00},
309 { LP8860_FAULT_CLEAR, 0x00},
310 { LP8860_EEPROM_CNTRL, 0x80},
311 { LP8860_EEPROM_UNLOCK, 0x00},
312 };
313
314 static const struct regmap_config lp8860_regmap_config = {
315 .reg_bits = 8,
316 .val_bits = 8,
317
318 .max_register = LP8860_EEPROM_UNLOCK,
319 .reg_defaults = lp8860_reg_defs,
320 .num_reg_defaults = ARRAY_SIZE(lp8860_reg_defs),
321 .cache_type = REGCACHE_NONE,
322 };
323
324 static const struct reg_default lp8860_eeprom_defs[] = {
325 { LP8860_EEPROM_REG_0, 0x00 },
326 { LP8860_EEPROM_REG_1, 0x00 },
327 { LP8860_EEPROM_REG_2, 0x00 },
328 { LP8860_EEPROM_REG_3, 0x00 },
329 { LP8860_EEPROM_REG_4, 0x00 },
330 { LP8860_EEPROM_REG_5, 0x00 },
331 { LP8860_EEPROM_REG_6, 0x00 },
332 { LP8860_EEPROM_REG_7, 0x00 },
333 { LP8860_EEPROM_REG_8, 0x00 },
334 { LP8860_EEPROM_REG_9, 0x00 },
335 { LP8860_EEPROM_REG_10, 0x00 },
336 { LP8860_EEPROM_REG_11, 0x00 },
337 { LP8860_EEPROM_REG_12, 0x00 },
338 { LP8860_EEPROM_REG_13, 0x00 },
339 { LP8860_EEPROM_REG_14, 0x00 },
340 { LP8860_EEPROM_REG_15, 0x00 },
341 { LP8860_EEPROM_REG_16, 0x00 },
342 { LP8860_EEPROM_REG_17, 0x00 },
343 { LP8860_EEPROM_REG_18, 0x00 },
344 { LP8860_EEPROM_REG_19, 0x00 },
345 { LP8860_EEPROM_REG_20, 0x00 },
346 { LP8860_EEPROM_REG_21, 0x00 },
347 { LP8860_EEPROM_REG_22, 0x00 },
348 { LP8860_EEPROM_REG_23, 0x00 },
349 { LP8860_EEPROM_REG_24, 0x00 },
350 };
351
352 static const struct regmap_config lp8860_eeprom_regmap_config = {
353 .reg_bits = 8,
354 .val_bits = 8,
355
356 .max_register = LP8860_EEPROM_REG_24,
357 .reg_defaults = lp8860_eeprom_defs,
358 .num_reg_defaults = ARRAY_SIZE(lp8860_eeprom_defs),
359 .cache_type = REGCACHE_NONE,
360 };
361
362 static int lp8860_probe(struct i2c_client *client,
363 const struct i2c_device_id *id)
364 {
365 int ret;
366 struct lp8860_led *led;
367 struct device_node *np = client->dev.of_node;
368
369 led = devm_kzalloc(&client->dev, sizeof(*led), GFP_KERNEL);
370 if (!led)
371 return -ENOMEM;
372
373 led->label = LP8860_DISP_LED_NAME;
374
375 if (client->dev.of_node) {
376 ret = of_property_read_string(np, "label", &led->label);
377 if (ret) {
378 dev_err(&client->dev, "Missing label in dt\n");
379 return -EINVAL;
380 }
381 }
382
383 led->enable_gpio = devm_gpiod_get_optional(&client->dev,
384 "enable", GPIOD_OUT_LOW);
385 if (IS_ERR(led->enable_gpio)) {
386 ret = PTR_ERR(led->enable_gpio);
387 dev_err(&client->dev, "Failed to get enable gpio: %d\n", ret);
388 return ret;
389 }
390
391 led->regulator = devm_regulator_get(&client->dev, "vled");
392 if (IS_ERR(led->regulator))
393 led->regulator = NULL;
394
395 led->client = client;
396 led->led_dev.name = led->label;
397 led->led_dev.max_brightness = LED_FULL;
398 led->led_dev.brightness_set_blocking = lp8860_brightness_set;
399
400 mutex_init(&led->lock);
401
402 i2c_set_clientdata(client, led);
403
404 led->regmap = devm_regmap_init_i2c(client, &lp8860_regmap_config);
405 if (IS_ERR(led->regmap)) {
406 ret = PTR_ERR(led->regmap);
407 dev_err(&client->dev, "Failed to allocate register map: %d\n",
408 ret);
409 return ret;
410 }
411
412 led->eeprom_regmap = devm_regmap_init_i2c(client, &lp8860_eeprom_regmap_config);
413 if (IS_ERR(led->eeprom_regmap)) {
414 ret = PTR_ERR(led->eeprom_regmap);
415 dev_err(&client->dev, "Failed to allocate register map: %d\n",
416 ret);
417 return ret;
418 }
419
420 ret = lp8860_init(led);
421 if (ret)
422 return ret;
423
424 ret = led_classdev_register(&client->dev, &led->led_dev);
425 if (ret) {
426 dev_err(&client->dev, "led register err: %d\n", ret);
427 return ret;
428 }
429
430 return 0;
431 }
432
433 static int lp8860_remove(struct i2c_client *client)
434 {
435 struct lp8860_led *led = i2c_get_clientdata(client);
436 int ret;
437
438 led_classdev_unregister(&led->led_dev);
439
440 if (led->enable_gpio)
441 gpiod_direction_output(led->enable_gpio, 0);
442
443 if (led->regulator) {
444 ret = regulator_disable(led->regulator);
445 if (ret)
446 dev_err(&led->client->dev,
447 "Failed to disable regulator\n");
448 }
449
450 return 0;
451 }
452
453 static const struct i2c_device_id lp8860_id[] = {
454 { "lp8860", 0 },
455 { }
456 };
457 MODULE_DEVICE_TABLE(i2c, lp8860_id);
458
459 #ifdef CONFIG_OF
460 static const struct of_device_id of_lp8860_leds_match[] = {
461 { .compatible = "ti,lp8860", },
462 {},
463 };
464 MODULE_DEVICE_TABLE(of, of_lp8860_leds_match);
465 #endif
466
467 static struct i2c_driver lp8860_driver = {
468 .driver = {
469 .name = "lp8860",
470 .of_match_table = of_match_ptr(of_lp8860_leds_match),
471 },
472 .probe = lp8860_probe,
473 .remove = lp8860_remove,
474 .id_table = lp8860_id,
475 };
476 module_i2c_driver(lp8860_driver);
477
478 MODULE_DESCRIPTION("Texas Instruments LP8860 LED driver");
479 MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
480 MODULE_LICENSE("GPL");
Linux with added FPC-III support