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 */
96 struct 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
106 struct lp8860_eeprom_reg {
107 uint8_t reg;
108 uint8_t value;
109 };
110
111 static 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
lp8860_unlock_eeprom(struct lp8860_led * led,int lock)139 static 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
174 out:
175 mutex_unlock(&led->lock);
176 return ret;
177 }
178
lp8860_fault_check(struct lp8860_led * led)179 static 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);
200 out:
201 return ret;
202 }
203
lp8860_brightness_set(struct led_classdev * led_cdev,enum led_brightness brt_val)204 static 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 }
233 out:
234 mutex_unlock(&led->lock);
235 return ret;
236 }
237
lp8860_init(struct lp8860_led * led)238 static 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) / sizeof(lp8860_eeprom_disp_regs[0]);
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
293 out:
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
307 static 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
327 static 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
337 static 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
365 static 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
lp8860_probe(struct i2c_client * client)375 static 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
lp8860_remove(struct i2c_client * client)444 static 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
461 static const struct i2c_device_id lp8860_id[] = {
462 { "lp8860" },
463 { }
464 };
465 MODULE_DEVICE_TABLE(i2c, lp8860_id);
466
467 static const struct of_device_id of_lp8860_leds_match[] = {
468 { .compatible = "ti,lp8860", },
469 {},
470 };
471 MODULE_DEVICE_TABLE(of, of_lp8860_leds_match);
472
473 static 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 };
482 module_i2c_driver(lp8860_driver);
483
484 MODULE_DESCRIPTION("Texas Instruments LP8860 LED driver");
485 MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
486 MODULE_LICENSE("GPL v2");
487