1 // SPDX-License-Identifier: GPL-2.0-only
3  * TI LP8864/LP8866 4/6 Channel LED Driver
30 /* Textual meaning for status bits, starting from bit 1 */
32 	"Vin under-voltage fault",
33 	"Vin over-voltage fault",
34 	"Vdd under-voltage fault",
35 	"Vin over-current fault",
42 /* Textual meaning for status bits, starting from bit 1 */
46 	"Boost over-current fault",
49 	"Missing LED resistor fault",
56 	"LED 1 fault",
57 	"LED 2 fault",
58 	"LED 3 fault",
59 	"LED 4 fault",
60 	"LED 5 fault",
61 	"LED 6 fault",
62 	"LED open fault",
63 	"LED internal short fault",
64 	"LED short to GND fault",
74  * @led_dev: led class device pointer
76  * @led_status_mask: Helps to report LED fault only once
85 static int lp8864_fault_check(struct lp8864_led *led)  in lp8864_fault_check()  argument
90 	ret = regmap_read(led->regmap, LP8864_SUPPLY_STATUS, &val);  in lp8864_fault_check()
96 		if (val & BIT(i * 2 + 1))  in lp8864_fault_check()
97 			dev_warn(&led->client->dev, "%s\n", lp8864_supply_status_msg[i]);  in lp8864_fault_check()
101 	 * both have to be written "1" simultaneously to clear the corresponding  in lp8864_fault_check()
105 		ret = regmap_write(led->regmap, LP8864_SUPPLY_STATUS, val >> 1 | val);  in lp8864_fault_check()
109 	ret = regmap_read(led->regmap, LP8864_BOOST_STATUS, &val);  in lp8864_fault_check()
115 		if (val & BIT(i * 2 + 1))  in lp8864_fault_check()
116 			dev_warn(&led->client->dev, "%s\n", lp8864_boost_status_msg[i]);  in lp8864_fault_check()
119 		ret = regmap_write(led->regmap, LP8864_BOOST_STATUS, val >> 1 | val);  in lp8864_fault_check()
123 	ret = regmap_read(led->regmap, LP8864_LED_STATUS, &val);  in lp8864_fault_check()
129 	 * power-down  in lp8864_fault_check()
131 	val &= ~led->led_status_mask;  in lp8864_fault_check()
135 			dev_warn(&led->client->dev, "%s\n", lp8864_led_status_msg[i]);  in lp8864_fault_check()
138 	 * Mark those which maintain their value until device power-down as  in lp8864_fault_check()
141 	led->led_status_mask |= val & ~LP8864_LED_STATUS_WR_MASK;  in lp8864_fault_check()
148 		ret = regmap_write(led->regmap, LP8864_LED_STATUS, val >> 1 | val);  in lp8864_fault_check()
155 	dev_err(&led->client->dev, "Failed to read/clear faults (%pe)\n", ERR_PTR(ret));  in lp8864_fault_check()
163 	struct lp8864_led *led = container_of(led_cdev, struct lp8864_led, led_dev);  in lp8864_brightness_set()  local
164 	/* Scale 0..LED_FULL into 16-bit HW brightness */  in lp8864_brightness_set()
168 	ret = lp8864_fault_check(led);  in lp8864_brightness_set()
172 	ret = regmap_write(led->regmap, LP8864_BRT_CONTROL, val);  in lp8864_brightness_set()
174 		dev_err(&led->client->dev, "Failed to write brightness value\n");  in lp8864_brightness_set()
181 	struct lp8864_led *led = container_of(led_cdev, struct lp8864_led, led_dev);  in lp8864_brightness_get()  local
185 	ret = regmap_read(led->regmap, LP8864_BRT_CONTROL, &val);  in lp8864_brightness_get()
187 		dev_err(&led->client->dev, "Failed to read brightness value\n");  in lp8864_brightness_get()
191 	/* Scale 16-bit HW brightness into 0..LED_FULL */  in lp8864_brightness_get()
211 	struct lp8864_led *led;  in lp8864_probe()  local
212 	struct device_node *np = dev_of_node(&client->dev);  in lp8864_probe()
217 	led = devm_kzalloc(&client->dev, sizeof(*led), GFP_KERNEL);  in lp8864_probe()
218 	if (!led)  in lp8864_probe()
219 		return -ENOMEM;  in lp8864_probe()
223 		dev_err(&client->dev, "No LED function defined\n");  in lp8864_probe()
224 		return -EINVAL;  in lp8864_probe()
227 	ret = devm_regulator_get_enable_optional(&client->dev, "vled");  in lp8864_probe()
228 	if (ret && ret != -ENODEV)  in lp8864_probe()
229 		return dev_err_probe(&client->dev, ret, "Failed to enable vled regulator\n");  in lp8864_probe()
231 	enable_gpio = devm_gpiod_get_optional(&client->dev, "enable", GPIOD_OUT_HIGH);  in lp8864_probe()
233 		return dev_err_probe(&client->dev, PTR_ERR(enable_gpio),  in lp8864_probe()
236 	ret = devm_add_action_or_reset(&client->dev, lp8864_disable_gpio, enable_gpio);  in lp8864_probe()
240 	led->client = client;  in lp8864_probe()
241 	led->led_dev.brightness_set_blocking = lp8864_brightness_set;  in lp8864_probe()
242 	led->led_dev.brightness_get = lp8864_brightness_get;  in lp8864_probe()
244 	led->regmap = devm_regmap_init_i2c(client, &lp8864_regmap_config);  in lp8864_probe()
245 	if (IS_ERR(led->regmap))  in lp8864_probe()
246 		return dev_err_probe(&client->dev, PTR_ERR(led->regmap),  in lp8864_probe()
250 	ret = regmap_update_bits(led->regmap, LP8864_USER_CONFIG1, LP8864_BRT_MODE_MASK,  in lp8864_probe()
253 		dev_err(&led->client->dev, "Failed to set brightness control mode\n");  in lp8864_probe()
257 	ret = lp8864_fault_check(led);  in lp8864_probe()
265 	ret = devm_led_classdev_register_ext(&client->dev, &led->led_dev, &init_data);  in lp8864_probe()
267 		dev_err(&client->dev, "Failed to register LED device (%pe)\n", ERR_PTR(ret));  in lp8864_probe()
294 MODULE_DESCRIPTION("Texas Instruments LP8864/LP8866 LED driver");