1 // SPDX-License-Identifier: GPL-2.0-only
3  * TI LP8860 4-Channel LED Driver
14 #include <linux/regulator/consumer.h>
90  * @led_dev: led class device pointer
94  * @regulator: LED supply regulator pointer
103 	struct regulator *regulator;  member
139 static int lp8860_unlock_eeprom(struct lp8860_led *led, int lock)  in lp8860_unlock_eeprom()  argument
143 	mutex_lock(&led->lock);  in lp8860_unlock_eeprom()
146 		ret = regmap_write(led->regmap,  in lp8860_unlock_eeprom()
150 			dev_err(&led->client->dev, "EEPROM Unlock failed\n");  in lp8860_unlock_eeprom()
154 		ret = regmap_write(led->regmap,  in lp8860_unlock_eeprom()
158 			dev_err(&led->client->dev, "EEPROM Unlock failed\n");  in lp8860_unlock_eeprom()
161 		ret = regmap_write(led->regmap,  in lp8860_unlock_eeprom()
165 			dev_err(&led->client->dev, "EEPROM Unlock failed\n");  in lp8860_unlock_eeprom()
169 		ret = regmap_write(led->regmap,  in lp8860_unlock_eeprom()
175 	mutex_unlock(&led->lock);  in lp8860_unlock_eeprom()
179 static int lp8860_fault_check(struct lp8860_led *led)  in lp8860_fault_check()  argument
184 	ret = regmap_read(led->regmap, LP8860_LED_FAULT, &read_buf);  in lp8860_fault_check()
190 	ret = regmap_read(led->regmap, LP8860_FAULT, &read_buf);  in lp8860_fault_check()
198 		ret = regmap_write(led->regmap, LP8860_FAULT_CLEAR,  in lp8860_fault_check()
207 	struct lp8860_led *led =  in lp8860_brightness_set()  local
212 	mutex_lock(&led->lock);  in lp8860_brightness_set()
214 	ret = lp8860_fault_check(led);  in lp8860_brightness_set()
216 		dev_err(&led->client->dev, "Cannot read/clear faults\n");  in lp8860_brightness_set()
220 	ret = regmap_write(led->regmap, LP8860_DISP_CL1_BRT_MSB,  in lp8860_brightness_set()
223 		dev_err(&led->client->dev, "Cannot write CL1 MSB\n");  in lp8860_brightness_set()
227 	ret = regmap_write(led->regmap, LP8860_DISP_CL1_BRT_LSB,  in lp8860_brightness_set()
230 		dev_err(&led->client->dev, "Cannot write CL1 LSB\n");  in lp8860_brightness_set()
234 	mutex_unlock(&led->lock);  in lp8860_brightness_set()
238 static int lp8860_init(struct lp8860_led *led)  in lp8860_init()  argument
243 	if (led->regulator) {  in lp8860_init()
244 		ret = regulator_enable(led->regulator);  in lp8860_init()
246 			dev_err(&led->client->dev,  in lp8860_init()
247 				"Failed to enable regulator\n");  in lp8860_init()
252 	gpiod_direction_output(led->enable_gpio, 1);  in lp8860_init()
254 	ret = lp8860_fault_check(led);  in lp8860_init()
258 	ret = regmap_read(led->regmap, LP8860_STATUS, &read_buf);  in lp8860_init()
262 	ret = lp8860_unlock_eeprom(led, LP8860_UNLOCK_EEPROM);  in lp8860_init()
264 		dev_err(&led->client->dev, "Failed unlocking EEPROM\n");  in lp8860_init()
270 		ret = regmap_write(led->eeprom_regmap,  in lp8860_init()
274 			dev_err(&led->client->dev, "Failed writing EEPROM\n");  in lp8860_init()
279 	ret = lp8860_unlock_eeprom(led, LP8860_LOCK_EEPROM);  in lp8860_init()
283 	ret = regmap_write(led->regmap,  in lp8860_init()
287 		dev_err(&led->client->dev, "Failed programming EEPROM\n");  in lp8860_init()
295 		gpiod_direction_output(led->enable_gpio, 0);  in lp8860_init()
297 	if (led->regulator) {  in lp8860_init()
298 		ret = regulator_disable(led->regulator);  in lp8860_init()
300 			dev_err(&led->client->dev,  in lp8860_init()
301 				"Failed to disable regulator\n");  in lp8860_init()
378 	struct lp8860_led *led;  in lp8860_probe()  local
379 	struct device_node *np = dev_of_node(&client->dev);  in lp8860_probe()
383 	led = devm_kzalloc(&client->dev, sizeof(*led), GFP_KERNEL);  in lp8860_probe()
384 	if (!led)  in lp8860_probe()
385 		return -ENOMEM;  in lp8860_probe()
389 		return -EINVAL;  in lp8860_probe()
391 	led->enable_gpio = devm_gpiod_get_optional(&client->dev,  in lp8860_probe()
393 	if (IS_ERR(led->enable_gpio)) {  in lp8860_probe()
394 		ret = PTR_ERR(led->enable_gpio);  in lp8860_probe()
395 		dev_err(&client->dev, "Failed to get enable gpio: %d\n", ret);  in lp8860_probe()
399 	led->regulator = devm_regulator_get(&client->dev, "vled");  in lp8860_probe()
400 	if (IS_ERR(led->regulator))  in lp8860_probe()
401 		led->regulator = NULL;  in lp8860_probe()
403 	led->client = client;  in lp8860_probe()
404 	led->led_dev.brightness_set_blocking = lp8860_brightness_set;  in lp8860_probe()
406 	mutex_init(&led->lock);  in lp8860_probe()
408 	i2c_set_clientdata(client, led);  in lp8860_probe()
410 	led->regmap = devm_regmap_init_i2c(client, &lp8860_regmap_config);  in lp8860_probe()
411 	if (IS_ERR(led->regmap)) {  in lp8860_probe()
412 		ret = PTR_ERR(led->regmap);  in lp8860_probe()
413 		dev_err(&client->dev, "Failed to allocate register map: %d\n",  in lp8860_probe()
418 	led->eeprom_regmap = devm_regmap_init_i2c(client, &lp8860_eeprom_regmap_config);  in lp8860_probe()
419 	if (IS_ERR(led->eeprom_regmap)) {  in lp8860_probe()
420 		ret = PTR_ERR(led->eeprom_regmap);  in lp8860_probe()
421 		dev_err(&client->dev, "Failed to allocate register map: %d\n",  in lp8860_probe()
426 	ret = lp8860_init(led);  in lp8860_probe()
434 	ret = devm_led_classdev_register_ext(&client->dev, &led->led_dev,  in lp8860_probe()
437 		dev_err(&client->dev, "led register err: %d\n", ret);  in lp8860_probe()
446 	struct lp8860_led *led = i2c_get_clientdata(client);  in lp8860_remove()  local
449 	gpiod_direction_output(led->enable_gpio, 0);  in lp8860_remove()
451 	if (led->regulator) {  in lp8860_remove()
452 		ret = regulator_disable(led->regulator);  in lp8860_remove()
454 			dev_err(&led->client->dev,  in lp8860_remove()
455 				"Failed to disable regulator\n");  in lp8860_remove()
458 	mutex_destroy(&led->lock);  in lp8860_remove()
484 MODULE_DESCRIPTION("Texas Instruments LP8860 LED driver");