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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * TI LP8860 4-Channel LED Driver
4 *
5 * Copyright (C) 2014 Texas Instruments
6 *
7 * Author: Dan Murphy <dmurphy@ti.com>
8 */
9
10#include <linux/i2c.h>
11#include <linux/init.h>
12#include <linux/leds.h>
13#include <linux/regmap.h>
14#include <linux/regulator/consumer.h>
15#include <linux/module.h>
16#include <linux/mutex.h>
17#include <linux/of.h>
18#include <linux/of_gpio.h>
19#include <linux/gpio/consumer.h>
20#include <linux/slab.h>
21
22#define LP8860_DISP_CL1_BRT_MSB 0x00
23#define LP8860_DISP_CL1_BRT_LSB 0x01
24#define LP8860_DISP_CL1_CURR_MSB 0x02
25#define LP8860_DISP_CL1_CURR_LSB 0x03
26#define LP8860_CL2_BRT_MSB 0x04
27#define LP8860_CL2_BRT_LSB 0x05
28#define LP8860_CL2_CURRENT 0x06
29#define LP8860_CL3_BRT_MSB 0x07
30#define LP8860_CL3_BRT_LSB 0x08
31#define LP8860_CL3_CURRENT 0x09
32#define LP8860_CL4_BRT_MSB 0x0a
33#define LP8860_CL4_BRT_LSB 0x0b
34#define LP8860_CL4_CURRENT 0x0c
35#define LP8860_CONFIG 0x0d
36#define LP8860_STATUS 0x0e
37#define LP8860_FAULT 0x0f
38#define LP8860_LED_FAULT 0x10
39#define LP8860_FAULT_CLEAR 0x11
40#define LP8860_ID 0x12
41#define LP8860_TEMP_MSB 0x13
42#define LP8860_TEMP_LSB 0x14
43#define LP8860_DISP_LED_CURR_MSB 0x15
44#define LP8860_DISP_LED_CURR_LSB 0x16
45#define LP8860_DISP_LED_PWM_MSB 0x17
46#define LP8860_DISP_LED_PWM_LSB 0x18
47#define LP8860_EEPROM_CNTRL 0x19
48#define LP8860_EEPROM_UNLOCK 0x1a
49
50#define LP8860_EEPROM_REG_0 0x60
51#define LP8860_EEPROM_REG_1 0x61
52#define LP8860_EEPROM_REG_2 0x62
53#define LP8860_EEPROM_REG_3 0x63
54#define LP8860_EEPROM_REG_4 0x64
55#define LP8860_EEPROM_REG_5 0x65
56#define LP8860_EEPROM_REG_6 0x66
57#define LP8860_EEPROM_REG_7 0x67
58#define LP8860_EEPROM_REG_8 0x68
59#define LP8860_EEPROM_REG_9 0x69
60#define LP8860_EEPROM_REG_10 0x6a
61#define LP8860_EEPROM_REG_11 0x6b
62#define LP8860_EEPROM_REG_12 0x6c
63#define LP8860_EEPROM_REG_13 0x6d
64#define LP8860_EEPROM_REG_14 0x6e
65#define LP8860_EEPROM_REG_15 0x6f
66#define LP8860_EEPROM_REG_16 0x70
67#define LP8860_EEPROM_REG_17 0x71
68#define LP8860_EEPROM_REG_18 0x72
69#define LP8860_EEPROM_REG_19 0x73
70#define LP8860_EEPROM_REG_20 0x74
71#define LP8860_EEPROM_REG_21 0x75
72#define LP8860_EEPROM_REG_22 0x76
73#define LP8860_EEPROM_REG_23 0x77
74#define LP8860_EEPROM_REG_24 0x78
75
76#define LP8860_LOCK_EEPROM 0x00
77#define LP8860_UNLOCK_EEPROM 0x01
78#define LP8860_PROGRAM_EEPROM 0x02
79#define LP8860_EEPROM_CODE_1 0x08
80#define LP8860_EEPROM_CODE_2 0xba
81#define LP8860_EEPROM_CODE_3 0xef
82
83#define LP8860_CLEAR_FAULTS 0x01
84
85#define LP8860_NAME "lp8860"
86
87/**
88 * struct lp8860_led
89 * @lock: Lock for reading/writing the device
90 * @client: Pointer to the I2C client
91 * @led_dev: led class device pointer
92 * @regmap: Devices register map
93 * @eeprom_regmap: EEPROM register map
94 * @enable_gpio: VDDIO/EN gpio to enable communication interface
95 * @regulator: LED supply regulator pointer
96 */
97struct lp8860_led {
98 struct mutex lock;
99 struct i2c_client *client;
100 struct led_classdev led_dev;
101 struct regmap *regmap;
102 struct regmap *eeprom_regmap;
103 struct gpio_desc *enable_gpio;
104 struct regulator *regulator;
105};
106
107struct lp8860_eeprom_reg {
108 uint8_t reg;
109 uint8_t value;
110};
111
112static struct lp8860_eeprom_reg lp8860_eeprom_disp_regs[] = {
113 { LP8860_EEPROM_REG_0, 0xed },
114 { LP8860_EEPROM_REG_1, 0xdf },
115 { LP8860_EEPROM_REG_2, 0xdc },
116 { LP8860_EEPROM_REG_3, 0xf0 },
117 { LP8860_EEPROM_REG_4, 0xdf },
118 { LP8860_EEPROM_REG_5, 0xe5 },
119 { LP8860_EEPROM_REG_6, 0xf2 },
120 { LP8860_EEPROM_REG_7, 0x77 },
121 { LP8860_EEPROM_REG_8, 0x77 },
122 { LP8860_EEPROM_REG_9, 0x71 },
123 { LP8860_EEPROM_REG_10, 0x3f },
124 { LP8860_EEPROM_REG_11, 0xb7 },
125 { LP8860_EEPROM_REG_12, 0x17 },
126 { LP8860_EEPROM_REG_13, 0xef },
127 { LP8860_EEPROM_REG_14, 0xb0 },
128 { LP8860_EEPROM_REG_15, 0x87 },
129 { LP8860_EEPROM_REG_16, 0xce },
130 { LP8860_EEPROM_REG_17, 0x72 },
131 { LP8860_EEPROM_REG_18, 0xe5 },
132 { LP8860_EEPROM_REG_19, 0xdf },
133 { LP8860_EEPROM_REG_20, 0x35 },
134 { LP8860_EEPROM_REG_21, 0x06 },
135 { LP8860_EEPROM_REG_22, 0xdc },
136 { LP8860_EEPROM_REG_23, 0x88 },
137 { LP8860_EEPROM_REG_24, 0x3E },
138};
139
140static int lp8860_unlock_eeprom(struct lp8860_led *led, int lock)
141{
142 int ret;
143
144 mutex_lock(&led->lock);
145
146 if (lock == LP8860_UNLOCK_EEPROM) {
147 ret = regmap_write(led->regmap,
148 LP8860_EEPROM_UNLOCK,
149 LP8860_EEPROM_CODE_1);
150 if (ret) {
151 dev_err(&led->client->dev, "EEPROM Unlock failed\n");
152 goto out;
153 }
154
155 ret = regmap_write(led->regmap,
156 LP8860_EEPROM_UNLOCK,
157 LP8860_EEPROM_CODE_2);
158 if (ret) {
159 dev_err(&led->client->dev, "EEPROM Unlock failed\n");
160 goto out;
161 }
162 ret = regmap_write(led->regmap,
163 LP8860_EEPROM_UNLOCK,
164 LP8860_EEPROM_CODE_3);
165 if (ret) {
166 dev_err(&led->client->dev, "EEPROM Unlock failed\n");
167 goto out;
168 }
169 } else {
170 ret = regmap_write(led->regmap,
171 LP8860_EEPROM_UNLOCK,
172 LP8860_LOCK_EEPROM);
173 }
174
175out:
176 mutex_unlock(&led->lock);
177 return ret;
178}
179
180static int lp8860_fault_check(struct lp8860_led *led)
181{
182 int ret, fault;
183 unsigned int read_buf;
184
185 ret = regmap_read(led->regmap, LP8860_LED_FAULT, &read_buf);
186 if (ret)
187 goto out;
188
189 fault = read_buf;
190
191 ret = regmap_read(led->regmap, LP8860_FAULT, &read_buf);
192 if (ret)
193 goto out;
194
195 fault |= read_buf;
196
197 /* Attempt to clear any faults */
198 if (fault)
199 ret = regmap_write(led->regmap, LP8860_FAULT_CLEAR,
200 LP8860_CLEAR_FAULTS);
201out:
202 return ret;
203}
204
205static int lp8860_brightness_set(struct led_classdev *led_cdev,
206 enum led_brightness brt_val)
207{
208 struct lp8860_led *led =
209 container_of(led_cdev, struct lp8860_led, led_dev);
210 int disp_brightness = brt_val * 255;
211 int ret;
212
213 mutex_lock(&led->lock);
214
215 ret = lp8860_fault_check(led);
216 if (ret) {
217 dev_err(&led->client->dev, "Cannot read/clear faults\n");
218 goto out;
219 }
220
221 ret = regmap_write(led->regmap, LP8860_DISP_CL1_BRT_MSB,
222 (disp_brightness & 0xff00) >> 8);
223 if (ret) {
224 dev_err(&led->client->dev, "Cannot write CL1 MSB\n");
225 goto out;
226 }
227
228 ret = regmap_write(led->regmap, LP8860_DISP_CL1_BRT_LSB,
229 disp_brightness & 0xff);
230 if (ret) {
231 dev_err(&led->client->dev, "Cannot write CL1 LSB\n");
232 goto out;
233 }
234out:
235 mutex_unlock(&led->lock);
236 return ret;
237}
238
239static int lp8860_init(struct lp8860_led *led)
240{
241 unsigned int read_buf;
242 int ret, i, reg_count;
243
244 if (led->regulator) {
245 ret = regulator_enable(led->regulator);
246 if (ret) {
247 dev_err(&led->client->dev,
248 "Failed to enable regulator\n");
249 return ret;
250 }
251 }
252
253 if (led->enable_gpio)
254 gpiod_direction_output(led->enable_gpio, 1);
255
256 ret = lp8860_fault_check(led);
257 if (ret)
258 goto out;
259
260 ret = regmap_read(led->regmap, LP8860_STATUS, &read_buf);
261 if (ret)
262 goto out;
263
264 ret = lp8860_unlock_eeprom(led, LP8860_UNLOCK_EEPROM);
265 if (ret) {
266 dev_err(&led->client->dev, "Failed unlocking EEPROM\n");
267 goto out;
268 }
269
270 reg_count = ARRAY_SIZE(lp8860_eeprom_disp_regs) / sizeof(lp8860_eeprom_disp_regs[0]);
271 for (i = 0; i < reg_count; i++) {
272 ret = regmap_write(led->eeprom_regmap,
273 lp8860_eeprom_disp_regs[i].reg,
274 lp8860_eeprom_disp_regs[i].value);
275 if (ret) {
276 dev_err(&led->client->dev, "Failed writing EEPROM\n");
277 goto out;
278 }
279 }
280
281 ret = lp8860_unlock_eeprom(led, LP8860_LOCK_EEPROM);
282 if (ret)
283 goto out;
284
285 ret = regmap_write(led->regmap,
286 LP8860_EEPROM_CNTRL,
287 LP8860_PROGRAM_EEPROM);
288 if (ret) {
289 dev_err(&led->client->dev, "Failed programming EEPROM\n");
290 goto out;
291 }
292
293 return ret;
294
295out:
296 if (ret)
297 if (led->enable_gpio)
298 gpiod_direction_output(led->enable_gpio, 0);
299
300 if (led->regulator) {
301 ret = regulator_disable(led->regulator);
302 if (ret)
303 dev_err(&led->client->dev,
304 "Failed to disable regulator\n");
305 }
306
307 return ret;
308}
309
310static const struct reg_default lp8860_reg_defs[] = {
311 { LP8860_DISP_CL1_BRT_MSB, 0x00},
312 { LP8860_DISP_CL1_BRT_LSB, 0x00},
313 { LP8860_DISP_CL1_CURR_MSB, 0x00},
314 { LP8860_DISP_CL1_CURR_LSB, 0x00},
315 { LP8860_CL2_BRT_MSB, 0x00},
316 { LP8860_CL2_BRT_LSB, 0x00},
317 { LP8860_CL2_CURRENT, 0x00},
318 { LP8860_CL3_BRT_MSB, 0x00},
319 { LP8860_CL3_BRT_LSB, 0x00},
320 { LP8860_CL3_CURRENT, 0x00},
321 { LP8860_CL4_BRT_MSB, 0x00},
322 { LP8860_CL4_BRT_LSB, 0x00},
323 { LP8860_CL4_CURRENT, 0x00},
324 { LP8860_CONFIG, 0x00},
325 { LP8860_FAULT_CLEAR, 0x00},
326 { LP8860_EEPROM_CNTRL, 0x80},
327 { LP8860_EEPROM_UNLOCK, 0x00},
328};
329
330static const struct regmap_config lp8860_regmap_config = {
331 .reg_bits = 8,
332 .val_bits = 8,
333
334 .max_register = LP8860_EEPROM_UNLOCK,
335 .reg_defaults = lp8860_reg_defs,
336 .num_reg_defaults = ARRAY_SIZE(lp8860_reg_defs),
337 .cache_type = REGCACHE_NONE,
338};
339
340static const struct reg_default lp8860_eeprom_defs[] = {
341 { LP8860_EEPROM_REG_0, 0x00 },
342 { LP8860_EEPROM_REG_1, 0x00 },
343 { LP8860_EEPROM_REG_2, 0x00 },
344 { LP8860_EEPROM_REG_3, 0x00 },
345 { LP8860_EEPROM_REG_4, 0x00 },
346 { LP8860_EEPROM_REG_5, 0x00 },
347 { LP8860_EEPROM_REG_6, 0x00 },
348 { LP8860_EEPROM_REG_7, 0x00 },
349 { LP8860_EEPROM_REG_8, 0x00 },
350 { LP8860_EEPROM_REG_9, 0x00 },
351 { LP8860_EEPROM_REG_10, 0x00 },
352 { LP8860_EEPROM_REG_11, 0x00 },
353 { LP8860_EEPROM_REG_12, 0x00 },
354 { LP8860_EEPROM_REG_13, 0x00 },
355 { LP8860_EEPROM_REG_14, 0x00 },
356 { LP8860_EEPROM_REG_15, 0x00 },
357 { LP8860_EEPROM_REG_16, 0x00 },
358 { LP8860_EEPROM_REG_17, 0x00 },
359 { LP8860_EEPROM_REG_18, 0x00 },
360 { LP8860_EEPROM_REG_19, 0x00 },
361 { LP8860_EEPROM_REG_20, 0x00 },
362 { LP8860_EEPROM_REG_21, 0x00 },
363 { LP8860_EEPROM_REG_22, 0x00 },
364 { LP8860_EEPROM_REG_23, 0x00 },
365 { LP8860_EEPROM_REG_24, 0x00 },
366};
367
368static const struct regmap_config lp8860_eeprom_regmap_config = {
369 .reg_bits = 8,
370 .val_bits = 8,
371
372 .max_register = LP8860_EEPROM_REG_24,
373 .reg_defaults = lp8860_eeprom_defs,
374 .num_reg_defaults = ARRAY_SIZE(lp8860_eeprom_defs),
375 .cache_type = REGCACHE_NONE,
376};
377
378static int lp8860_probe(struct i2c_client *client,
379 const struct i2c_device_id *id)
380{
381 int ret;
382 struct lp8860_led *led;
383 struct device_node *np = dev_of_node(&client->dev);
384 struct device_node *child_node;
385 struct led_init_data init_data = {};
386
387 led = devm_kzalloc(&client->dev, sizeof(*led), GFP_KERNEL);
388 if (!led)
389 return -ENOMEM;
390
391 child_node = of_get_next_available_child(np, NULL);
392 if (!child_node)
393 return -EINVAL;
394
395 led->enable_gpio = devm_gpiod_get_optional(&client->dev,
396 "enable", GPIOD_OUT_LOW);
397 if (IS_ERR(led->enable_gpio)) {
398 ret = PTR_ERR(led->enable_gpio);
399 dev_err(&client->dev, "Failed to get enable gpio: %d\n", ret);
400 return ret;
401 }
402
403 led->regulator = devm_regulator_get(&client->dev, "vled");
404 if (IS_ERR(led->regulator))
405 led->regulator = NULL;
406
407 led->client = client;
408 led->led_dev.brightness_set_blocking = lp8860_brightness_set;
409
410 mutex_init(&led->lock);
411
412 i2c_set_clientdata(client, led);
413
414 led->regmap = devm_regmap_init_i2c(client, &lp8860_regmap_config);
415 if (IS_ERR(led->regmap)) {
416 ret = PTR_ERR(led->regmap);
417 dev_err(&client->dev, "Failed to allocate register map: %d\n",
418 ret);
419 return ret;
420 }
421
422 led->eeprom_regmap = devm_regmap_init_i2c(client, &lp8860_eeprom_regmap_config);
423 if (IS_ERR(led->eeprom_regmap)) {
424 ret = PTR_ERR(led->eeprom_regmap);
425 dev_err(&client->dev, "Failed to allocate register map: %d\n",
426 ret);
427 return ret;
428 }
429
430 ret = lp8860_init(led);
431 if (ret)
432 return ret;
433
434 init_data.fwnode = of_fwnode_handle(child_node);
435 init_data.devicename = LP8860_NAME;
436 init_data.default_label = ":display_cluster";
437
438 ret = devm_led_classdev_register_ext(&client->dev, &led->led_dev,
439 &init_data);
440 if (ret) {
441 dev_err(&client->dev, "led register err: %d\n", ret);
442 return ret;
443 }
444
445 return 0;
446}
447
448static void lp8860_remove(struct i2c_client *client)
449{
450 struct lp8860_led *led = i2c_get_clientdata(client);
451 int ret;
452
453 if (led->enable_gpio)
454 gpiod_direction_output(led->enable_gpio, 0);
455
456 if (led->regulator) {
457 ret = regulator_disable(led->regulator);
458 if (ret)
459 dev_err(&led->client->dev,
460 "Failed to disable regulator\n");
461 }
462
463 mutex_destroy(&led->lock);
464}
465
466static const struct i2c_device_id lp8860_id[] = {
467 { "lp8860", 0 },
468 { }
469};
470MODULE_DEVICE_TABLE(i2c, lp8860_id);
471
472static const struct of_device_id of_lp8860_leds_match[] = {
473 { .compatible = "ti,lp8860", },
474 {},
475};
476MODULE_DEVICE_TABLE(of, of_lp8860_leds_match);
477
478static struct i2c_driver lp8860_driver = {
479 .driver = {
480 .name = "lp8860",
481 .of_match_table = of_lp8860_leds_match,
482 },
483 .probe = lp8860_probe,
484 .remove = lp8860_remove,
485 .id_table = lp8860_id,
486};
487module_i2c_driver(lp8860_driver);
488
489MODULE_DESCRIPTION("Texas Instruments LP8860 LED driver");
490MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
491MODULE_LICENSE("GPL v2");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * TI LP8860 4-Channel LED Driver
4 *
5 * Copyright (C) 2014 Texas Instruments
6 *
7 * Author: Dan Murphy <dmurphy@ti.com>
8 */
9
10#include <linux/i2c.h>
11#include <linux/init.h>
12#include <linux/leds.h>
13#include <linux/regmap.h>
14#include <linux/regulator/consumer.h>
15#include <linux/module.h>
16#include <linux/mutex.h>
17#include <linux/of.h>
18#include <linux/gpio/consumer.h>
19#include <linux/slab.h>
20
21#define LP8860_DISP_CL1_BRT_MSB 0x00
22#define LP8860_DISP_CL1_BRT_LSB 0x01
23#define LP8860_DISP_CL1_CURR_MSB 0x02
24#define LP8860_DISP_CL1_CURR_LSB 0x03
25#define LP8860_CL2_BRT_MSB 0x04
26#define LP8860_CL2_BRT_LSB 0x05
27#define LP8860_CL2_CURRENT 0x06
28#define LP8860_CL3_BRT_MSB 0x07
29#define LP8860_CL3_BRT_LSB 0x08
30#define LP8860_CL3_CURRENT 0x09
31#define LP8860_CL4_BRT_MSB 0x0a
32#define LP8860_CL4_BRT_LSB 0x0b
33#define LP8860_CL4_CURRENT 0x0c
34#define LP8860_CONFIG 0x0d
35#define LP8860_STATUS 0x0e
36#define LP8860_FAULT 0x0f
37#define LP8860_LED_FAULT 0x10
38#define LP8860_FAULT_CLEAR 0x11
39#define LP8860_ID 0x12
40#define LP8860_TEMP_MSB 0x13
41#define LP8860_TEMP_LSB 0x14
42#define LP8860_DISP_LED_CURR_MSB 0x15
43#define LP8860_DISP_LED_CURR_LSB 0x16
44#define LP8860_DISP_LED_PWM_MSB 0x17
45#define LP8860_DISP_LED_PWM_LSB 0x18
46#define LP8860_EEPROM_CNTRL 0x19
47#define LP8860_EEPROM_UNLOCK 0x1a
48
49#define LP8860_EEPROM_REG_0 0x60
50#define LP8860_EEPROM_REG_1 0x61
51#define LP8860_EEPROM_REG_2 0x62
52#define LP8860_EEPROM_REG_3 0x63
53#define LP8860_EEPROM_REG_4 0x64
54#define LP8860_EEPROM_REG_5 0x65
55#define LP8860_EEPROM_REG_6 0x66
56#define LP8860_EEPROM_REG_7 0x67
57#define LP8860_EEPROM_REG_8 0x68
58#define LP8860_EEPROM_REG_9 0x69
59#define LP8860_EEPROM_REG_10 0x6a
60#define LP8860_EEPROM_REG_11 0x6b
61#define LP8860_EEPROM_REG_12 0x6c
62#define LP8860_EEPROM_REG_13 0x6d
63#define LP8860_EEPROM_REG_14 0x6e
64#define LP8860_EEPROM_REG_15 0x6f
65#define LP8860_EEPROM_REG_16 0x70
66#define LP8860_EEPROM_REG_17 0x71
67#define LP8860_EEPROM_REG_18 0x72
68#define LP8860_EEPROM_REG_19 0x73
69#define LP8860_EEPROM_REG_20 0x74
70#define LP8860_EEPROM_REG_21 0x75
71#define LP8860_EEPROM_REG_22 0x76
72#define LP8860_EEPROM_REG_23 0x77
73#define LP8860_EEPROM_REG_24 0x78
74
75#define LP8860_LOCK_EEPROM 0x00
76#define LP8860_UNLOCK_EEPROM 0x01
77#define LP8860_PROGRAM_EEPROM 0x02
78#define LP8860_EEPROM_CODE_1 0x08
79#define LP8860_EEPROM_CODE_2 0xba
80#define LP8860_EEPROM_CODE_3 0xef
81
82#define LP8860_CLEAR_FAULTS 0x01
83
84#define LP8860_NAME "lp8860"
85
86/**
87 * struct lp8860_led
88 * @lock: Lock for reading/writing the device
89 * @client: Pointer to the I2C client
90 * @led_dev: led class device pointer
91 * @regmap: Devices register map
92 * @eeprom_regmap: EEPROM register map
93 * @enable_gpio: VDDIO/EN gpio to enable communication interface
94 * @regulator: LED supply regulator pointer
95 */
96struct lp8860_led {
97 struct mutex lock;
98 struct i2c_client *client;
99 struct led_classdev led_dev;
100 struct regmap *regmap;
101 struct regmap *eeprom_regmap;
102 struct gpio_desc *enable_gpio;
103 struct regulator *regulator;
104};
105
106struct lp8860_eeprom_reg {
107 uint8_t reg;
108 uint8_t value;
109};
110
111static struct lp8860_eeprom_reg lp8860_eeprom_disp_regs[] = {
112 { LP8860_EEPROM_REG_0, 0xed },
113 { LP8860_EEPROM_REG_1, 0xdf },
114 { LP8860_EEPROM_REG_2, 0xdc },
115 { LP8860_EEPROM_REG_3, 0xf0 },
116 { LP8860_EEPROM_REG_4, 0xdf },
117 { LP8860_EEPROM_REG_5, 0xe5 },
118 { LP8860_EEPROM_REG_6, 0xf2 },
119 { LP8860_EEPROM_REG_7, 0x77 },
120 { LP8860_EEPROM_REG_8, 0x77 },
121 { LP8860_EEPROM_REG_9, 0x71 },
122 { LP8860_EEPROM_REG_10, 0x3f },
123 { LP8860_EEPROM_REG_11, 0xb7 },
124 { LP8860_EEPROM_REG_12, 0x17 },
125 { LP8860_EEPROM_REG_13, 0xef },
126 { LP8860_EEPROM_REG_14, 0xb0 },
127 { LP8860_EEPROM_REG_15, 0x87 },
128 { LP8860_EEPROM_REG_16, 0xce },
129 { LP8860_EEPROM_REG_17, 0x72 },
130 { LP8860_EEPROM_REG_18, 0xe5 },
131 { LP8860_EEPROM_REG_19, 0xdf },
132 { LP8860_EEPROM_REG_20, 0x35 },
133 { LP8860_EEPROM_REG_21, 0x06 },
134 { LP8860_EEPROM_REG_22, 0xdc },
135 { LP8860_EEPROM_REG_23, 0x88 },
136 { LP8860_EEPROM_REG_24, 0x3E },
137};
138
139static int lp8860_unlock_eeprom(struct lp8860_led *led, int lock)
140{
141 int ret;
142
143 mutex_lock(&led->lock);
144
145 if (lock == LP8860_UNLOCK_EEPROM) {
146 ret = regmap_write(led->regmap,
147 LP8860_EEPROM_UNLOCK,
148 LP8860_EEPROM_CODE_1);
149 if (ret) {
150 dev_err(&led->client->dev, "EEPROM Unlock failed\n");
151 goto out;
152 }
153
154 ret = regmap_write(led->regmap,
155 LP8860_EEPROM_UNLOCK,
156 LP8860_EEPROM_CODE_2);
157 if (ret) {
158 dev_err(&led->client->dev, "EEPROM Unlock failed\n");
159 goto out;
160 }
161 ret = regmap_write(led->regmap,
162 LP8860_EEPROM_UNLOCK,
163 LP8860_EEPROM_CODE_3);
164 if (ret) {
165 dev_err(&led->client->dev, "EEPROM Unlock failed\n");
166 goto out;
167 }
168 } else {
169 ret = regmap_write(led->regmap,
170 LP8860_EEPROM_UNLOCK,
171 LP8860_LOCK_EEPROM);
172 }
173
174out:
175 mutex_unlock(&led->lock);
176 return ret;
177}
178
179static int lp8860_fault_check(struct lp8860_led *led)
180{
181 int ret, fault;
182 unsigned int read_buf;
183
184 ret = regmap_read(led->regmap, LP8860_LED_FAULT, &read_buf);
185 if (ret)
186 goto out;
187
188 fault = read_buf;
189
190 ret = regmap_read(led->regmap, LP8860_FAULT, &read_buf);
191 if (ret)
192 goto out;
193
194 fault |= read_buf;
195
196 /* Attempt to clear any faults */
197 if (fault)
198 ret = regmap_write(led->regmap, LP8860_FAULT_CLEAR,
199 LP8860_CLEAR_FAULTS);
200out:
201 return ret;
202}
203
204static int lp8860_brightness_set(struct led_classdev *led_cdev,
205 enum led_brightness brt_val)
206{
207 struct lp8860_led *led =
208 container_of(led_cdev, struct lp8860_led, led_dev);
209 int disp_brightness = brt_val * 255;
210 int ret;
211
212 mutex_lock(&led->lock);
213
214 ret = lp8860_fault_check(led);
215 if (ret) {
216 dev_err(&led->client->dev, "Cannot read/clear faults\n");
217 goto out;
218 }
219
220 ret = regmap_write(led->regmap, LP8860_DISP_CL1_BRT_MSB,
221 (disp_brightness & 0xff00) >> 8);
222 if (ret) {
223 dev_err(&led->client->dev, "Cannot write CL1 MSB\n");
224 goto out;
225 }
226
227 ret = regmap_write(led->regmap, LP8860_DISP_CL1_BRT_LSB,
228 disp_brightness & 0xff);
229 if (ret) {
230 dev_err(&led->client->dev, "Cannot write CL1 LSB\n");
231 goto out;
232 }
233out:
234 mutex_unlock(&led->lock);
235 return ret;
236}
237
238static int lp8860_init(struct lp8860_led *led)
239{
240 unsigned int read_buf;
241 int ret, i, reg_count;
242
243 if (led->regulator) {
244 ret = regulator_enable(led->regulator);
245 if (ret) {
246 dev_err(&led->client->dev,
247 "Failed to enable regulator\n");
248 return ret;
249 }
250 }
251
252 gpiod_direction_output(led->enable_gpio, 1);
253
254 ret = lp8860_fault_check(led);
255 if (ret)
256 goto out;
257
258 ret = regmap_read(led->regmap, LP8860_STATUS, &read_buf);
259 if (ret)
260 goto out;
261
262 ret = lp8860_unlock_eeprom(led, LP8860_UNLOCK_EEPROM);
263 if (ret) {
264 dev_err(&led->client->dev, "Failed unlocking EEPROM\n");
265 goto out;
266 }
267
268 reg_count = ARRAY_SIZE(lp8860_eeprom_disp_regs);
269 for (i = 0; i < reg_count; i++) {
270 ret = regmap_write(led->eeprom_regmap,
271 lp8860_eeprom_disp_regs[i].reg,
272 lp8860_eeprom_disp_regs[i].value);
273 if (ret) {
274 dev_err(&led->client->dev, "Failed writing EEPROM\n");
275 goto out;
276 }
277 }
278
279 ret = lp8860_unlock_eeprom(led, LP8860_LOCK_EEPROM);
280 if (ret)
281 goto out;
282
283 ret = regmap_write(led->regmap,
284 LP8860_EEPROM_CNTRL,
285 LP8860_PROGRAM_EEPROM);
286 if (ret) {
287 dev_err(&led->client->dev, "Failed programming EEPROM\n");
288 goto out;
289 }
290
291 return ret;
292
293out:
294 if (ret)
295 gpiod_direction_output(led->enable_gpio, 0);
296
297 if (led->regulator) {
298 ret = regulator_disable(led->regulator);
299 if (ret)
300 dev_err(&led->client->dev,
301 "Failed to disable regulator\n");
302 }
303
304 return ret;
305}
306
307static const struct reg_default lp8860_reg_defs[] = {
308 { LP8860_DISP_CL1_BRT_MSB, 0x00},
309 { LP8860_DISP_CL1_BRT_LSB, 0x00},
310 { LP8860_DISP_CL1_CURR_MSB, 0x00},
311 { LP8860_DISP_CL1_CURR_LSB, 0x00},
312 { LP8860_CL2_BRT_MSB, 0x00},
313 { LP8860_CL2_BRT_LSB, 0x00},
314 { LP8860_CL2_CURRENT, 0x00},
315 { LP8860_CL3_BRT_MSB, 0x00},
316 { LP8860_CL3_BRT_LSB, 0x00},
317 { LP8860_CL3_CURRENT, 0x00},
318 { LP8860_CL4_BRT_MSB, 0x00},
319 { LP8860_CL4_BRT_LSB, 0x00},
320 { LP8860_CL4_CURRENT, 0x00},
321 { LP8860_CONFIG, 0x00},
322 { LP8860_FAULT_CLEAR, 0x00},
323 { LP8860_EEPROM_CNTRL, 0x80},
324 { LP8860_EEPROM_UNLOCK, 0x00},
325};
326
327static const struct regmap_config lp8860_regmap_config = {
328 .reg_bits = 8,
329 .val_bits = 8,
330
331 .max_register = LP8860_EEPROM_UNLOCK,
332 .reg_defaults = lp8860_reg_defs,
333 .num_reg_defaults = ARRAY_SIZE(lp8860_reg_defs),
334 .cache_type = REGCACHE_NONE,
335};
336
337static const struct reg_default lp8860_eeprom_defs[] = {
338 { LP8860_EEPROM_REG_0, 0x00 },
339 { LP8860_EEPROM_REG_1, 0x00 },
340 { LP8860_EEPROM_REG_2, 0x00 },
341 { LP8860_EEPROM_REG_3, 0x00 },
342 { LP8860_EEPROM_REG_4, 0x00 },
343 { LP8860_EEPROM_REG_5, 0x00 },
344 { LP8860_EEPROM_REG_6, 0x00 },
345 { LP8860_EEPROM_REG_7, 0x00 },
346 { LP8860_EEPROM_REG_8, 0x00 },
347 { LP8860_EEPROM_REG_9, 0x00 },
348 { LP8860_EEPROM_REG_10, 0x00 },
349 { LP8860_EEPROM_REG_11, 0x00 },
350 { LP8860_EEPROM_REG_12, 0x00 },
351 { LP8860_EEPROM_REG_13, 0x00 },
352 { LP8860_EEPROM_REG_14, 0x00 },
353 { LP8860_EEPROM_REG_15, 0x00 },
354 { LP8860_EEPROM_REG_16, 0x00 },
355 { LP8860_EEPROM_REG_17, 0x00 },
356 { LP8860_EEPROM_REG_18, 0x00 },
357 { LP8860_EEPROM_REG_19, 0x00 },
358 { LP8860_EEPROM_REG_20, 0x00 },
359 { LP8860_EEPROM_REG_21, 0x00 },
360 { LP8860_EEPROM_REG_22, 0x00 },
361 { LP8860_EEPROM_REG_23, 0x00 },
362 { LP8860_EEPROM_REG_24, 0x00 },
363};
364
365static const struct regmap_config lp8860_eeprom_regmap_config = {
366 .reg_bits = 8,
367 .val_bits = 8,
368
369 .max_register = LP8860_EEPROM_REG_24,
370 .reg_defaults = lp8860_eeprom_defs,
371 .num_reg_defaults = ARRAY_SIZE(lp8860_eeprom_defs),
372 .cache_type = REGCACHE_NONE,
373};
374
375static int lp8860_probe(struct i2c_client *client)
376{
377 int ret;
378 struct lp8860_led *led;
379 struct device_node *np = dev_of_node(&client->dev);
380 struct device_node *child_node;
381 struct led_init_data init_data = {};
382
383 led = devm_kzalloc(&client->dev, sizeof(*led), GFP_KERNEL);
384 if (!led)
385 return -ENOMEM;
386
387 child_node = of_get_next_available_child(np, NULL);
388 if (!child_node)
389 return -EINVAL;
390
391 led->enable_gpio = devm_gpiod_get_optional(&client->dev,
392 "enable", GPIOD_OUT_LOW);
393 if (IS_ERR(led->enable_gpio)) {
394 ret = PTR_ERR(led->enable_gpio);
395 dev_err(&client->dev, "Failed to get enable gpio: %d\n", ret);
396 return ret;
397 }
398
399 led->regulator = devm_regulator_get(&client->dev, "vled");
400 if (IS_ERR(led->regulator))
401 led->regulator = NULL;
402
403 led->client = client;
404 led->led_dev.brightness_set_blocking = lp8860_brightness_set;
405
406 mutex_init(&led->lock);
407
408 i2c_set_clientdata(client, led);
409
410 led->regmap = devm_regmap_init_i2c(client, &lp8860_regmap_config);
411 if (IS_ERR(led->regmap)) {
412 ret = PTR_ERR(led->regmap);
413 dev_err(&client->dev, "Failed to allocate register map: %d\n",
414 ret);
415 return ret;
416 }
417
418 led->eeprom_regmap = devm_regmap_init_i2c(client, &lp8860_eeprom_regmap_config);
419 if (IS_ERR(led->eeprom_regmap)) {
420 ret = PTR_ERR(led->eeprom_regmap);
421 dev_err(&client->dev, "Failed to allocate register map: %d\n",
422 ret);
423 return ret;
424 }
425
426 ret = lp8860_init(led);
427 if (ret)
428 return ret;
429
430 init_data.fwnode = of_fwnode_handle(child_node);
431 init_data.devicename = LP8860_NAME;
432 init_data.default_label = ":display_cluster";
433
434 ret = devm_led_classdev_register_ext(&client->dev, &led->led_dev,
435 &init_data);
436 if (ret) {
437 dev_err(&client->dev, "led register err: %d\n", ret);
438 return ret;
439 }
440
441 return 0;
442}
443
444static void lp8860_remove(struct i2c_client *client)
445{
446 struct lp8860_led *led = i2c_get_clientdata(client);
447 int ret;
448
449 gpiod_direction_output(led->enable_gpio, 0);
450
451 if (led->regulator) {
452 ret = regulator_disable(led->regulator);
453 if (ret)
454 dev_err(&led->client->dev,
455 "Failed to disable regulator\n");
456 }
457
458 mutex_destroy(&led->lock);
459}
460
461static const struct i2c_device_id lp8860_id[] = {
462 { "lp8860" },
463 { }
464};
465MODULE_DEVICE_TABLE(i2c, lp8860_id);
466
467static const struct of_device_id of_lp8860_leds_match[] = {
468 { .compatible = "ti,lp8860", },
469 {},
470};
471MODULE_DEVICE_TABLE(of, of_lp8860_leds_match);
472
473static struct i2c_driver lp8860_driver = {
474 .driver = {
475 .name = "lp8860",
476 .of_match_table = of_lp8860_leds_match,
477 },
478 .probe = lp8860_probe,
479 .remove = lp8860_remove,
480 .id_table = lp8860_id,
481};
482module_i2c_driver(lp8860_driver);
483
484MODULE_DESCRIPTION("Texas Instruments LP8860 LED driver");
485MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
486MODULE_LICENSE("GPL v2");