1 // SPDX-License-Identifier: GPL-2.0-only
3  * leds-regulator.c - LED class driver for regulator driven LEDs.
7  * Inspired by leds-wm8350 driver.
14 #include <linux/leds-regulator.h>
39 	 * and the LED can be turned on and off.  in led_regulator_get_max_brightness()
52 		return -EINVAL;  in led_regulator_get_voltage()
54 	return regulator_list_voltage(supply, brightness - 1);  in led_regulator_get_voltage()
58 static void regulator_led_enable(struct regulator_led *led)  in regulator_led_enable()  argument
62 	if (led->enabled)  in regulator_led_enable()
65 	ret = regulator_enable(led->vcc);  in regulator_led_enable()
67 		dev_err(led->cdev.dev, "Failed to enable vcc: %d\n", ret);  in regulator_led_enable()
71 	led->enabled = 1;  in regulator_led_enable()
74 static void regulator_led_disable(struct regulator_led *led)  in regulator_led_disable()  argument
78 	if (!led->enabled)  in regulator_led_disable()
81 	ret = regulator_disable(led->vcc);  in regulator_led_disable()
83 		dev_err(led->cdev.dev, "Failed to disable vcc: %d\n", ret);  in regulator_led_disable()
87 	led->enabled = 0;  in regulator_led_disable()
93 	struct regulator_led *led = to_regulator_led(led_cdev);  in regulator_led_brightness_set()  local
97 	mutex_lock(&led->mutex);  in regulator_led_brightness_set()
100 		regulator_led_disable(led);  in regulator_led_brightness_set()
104 	if (led->cdev.max_brightness > 1) {  in regulator_led_brightness_set()
105 		voltage = led_regulator_get_voltage(led->vcc, value);  in regulator_led_brightness_set()
106 		dev_dbg(led->cdev.dev, "brightness: %d voltage: %d\n",  in regulator_led_brightness_set()
109 		ret = regulator_set_voltage(led->vcc, voltage, voltage);  in regulator_led_brightness_set()
111 			dev_err(led->cdev.dev, "Failed to set voltage %d: %d\n",  in regulator_led_brightness_set()
115 	regulator_led_enable(led);  in regulator_led_brightness_set()
118 	mutex_unlock(&led->mutex);  in regulator_led_brightness_set()
125 			dev_get_platdata(&pdev->dev);  in regulator_led_probe()
126 	struct regulator_led *led;  in regulator_led_probe()  local
131 		dev_err(&pdev->dev, "no platform data\n");  in regulator_led_probe()
132 		return -ENODEV;  in regulator_led_probe()
135 	vcc = devm_regulator_get_exclusive(&pdev->dev, "vled");  in regulator_led_probe()
137 		dev_err(&pdev->dev, "Cannot get vcc for %s\n", pdata->name);  in regulator_led_probe()
141 	led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);  in regulator_led_probe()
142 	if (led == NULL)  in regulator_led_probe()
143 		return -ENOMEM;  in regulator_led_probe()
145 	led->cdev.max_brightness = led_regulator_get_max_brightness(vcc);  in regulator_led_probe()
146 	if (pdata->brightness > led->cdev.max_brightness) {  in regulator_led_probe()
147 		dev_err(&pdev->dev, "Invalid default brightness %d\n",  in regulator_led_probe()
148 				pdata->brightness);  in regulator_led_probe()
149 		return -EINVAL;  in regulator_led_probe()
152 	led->cdev.brightness_set_blocking = regulator_led_brightness_set;  in regulator_led_probe()
153 	led->cdev.name = pdata->name;  in regulator_led_probe()
154 	led->cdev.flags |= LED_CORE_SUSPENDRESUME;  in regulator_led_probe()
155 	led->vcc = vcc;  in regulator_led_probe()
158 	if (regulator_is_enabled(led->vcc))  in regulator_led_probe()
159 		led->enabled = 1;  in regulator_led_probe()
161 	mutex_init(&led->mutex);  in regulator_led_probe()
163 	platform_set_drvdata(pdev, led);  in regulator_led_probe()
165 	ret = led_classdev_register(&pdev->dev, &led->cdev);  in regulator_led_probe()
170 	led->cdev.brightness = pdata->brightness;  in regulator_led_probe()
172 	/* Set the default led status */  in regulator_led_probe()
173 	regulator_led_brightness_set(&led->cdev, led->cdev.brightness);  in regulator_led_probe()
180 	struct regulator_led *led = platform_get_drvdata(pdev);  in regulator_led_remove()  local
182 	led_classdev_unregister(&led->cdev);  in regulator_led_remove()
183 	regulator_led_disable(led);  in regulator_led_remove()
189 		   .name  = "leds-regulator",
198 MODULE_DESCRIPTION("Regulator driven LED driver");
200 MODULE_ALIAS("platform:leds-regulator");