2  * leds-regulator.c - LED class driver for regulator driven LEDs.
6  * Inspired by leds-wm8350 driver.
18 #include <linux/leds-regulator.h>
53 		enum led_brightness brightness)  in led_regulator_get_voltage()  argument
55 	if (brightness == 0)  in led_regulator_get_voltage()
56 		return -EINVAL;  in led_regulator_get_voltage()
58 	return regulator_list_voltage(supply, brightness - 1);  in led_regulator_get_voltage()
66 	if (led->enabled)  in regulator_led_enable()
69 	ret = regulator_enable(led->vcc);  in regulator_led_enable()
71 		dev_err(led->cdev.dev, "Failed to enable vcc: %d\n", ret);  in regulator_led_enable()
75 	led->enabled = 1;  in regulator_led_enable()
82 	if (!led->enabled)  in regulator_led_disable()
85 	ret = regulator_disable(led->vcc);  in regulator_led_disable()
87 		dev_err(led->cdev.dev, "Failed to disable vcc: %d\n", ret);  in regulator_led_disable()
91 	led->enabled = 0;  in regulator_led_disable()
101 	mutex_lock(&led->mutex);  in regulator_led_brightness_set()
108 	if (led->cdev.max_brightness > 1) {  in regulator_led_brightness_set()
109 		voltage = led_regulator_get_voltage(led->vcc, value);  in regulator_led_brightness_set()
110 		dev_dbg(led->cdev.dev, "brightness: %d voltage: %d\n",  in regulator_led_brightness_set()
113 		ret = regulator_set_voltage(led->vcc, voltage, voltage);  in regulator_led_brightness_set()
115 			dev_err(led->cdev.dev, "Failed to set voltage %d: %d\n",  in regulator_led_brightness_set()
122 	mutex_unlock(&led->mutex);  in regulator_led_brightness_set()
129 			dev_get_platdata(&pdev->dev);  in regulator_led_probe()
135 		dev_err(&pdev->dev, "no platform data\n");  in regulator_led_probe()
136 		return -ENODEV;  in regulator_led_probe()
139 	vcc = devm_regulator_get_exclusive(&pdev->dev, "vled");  in regulator_led_probe()
141 		dev_err(&pdev->dev, "Cannot get vcc for %s\n", pdata->name);  in regulator_led_probe()
145 	led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);  in regulator_led_probe()
147 		return -ENOMEM;  in regulator_led_probe()
149 	led->cdev.max_brightness = led_regulator_get_max_brightness(vcc);  in regulator_led_probe()
150 	if (pdata->brightness > led->cdev.max_brightness) {  in regulator_led_probe()
151 		dev_err(&pdev->dev, "Invalid default brightness %d\n",  in regulator_led_probe()
152 				pdata->brightness);  in regulator_led_probe()
153 		return -EINVAL;  in regulator_led_probe()
156 	led->cdev.brightness_set_blocking = regulator_led_brightness_set;  in regulator_led_probe()
157 	led->cdev.name = pdata->name;  in regulator_led_probe()
158 	led->cdev.flags |= LED_CORE_SUSPENDRESUME;  in regulator_led_probe()
159 	led->vcc = vcc;  in regulator_led_probe()
162 	if (regulator_is_enabled(led->vcc))  in regulator_led_probe()
163 		led->enabled = 1;  in regulator_led_probe()
165 	mutex_init(&led->mutex);  in regulator_led_probe()
169 	ret = led_classdev_register(&pdev->dev, &led->cdev);  in regulator_led_probe()
173 	/* to expose the default value to userspace */  in regulator_led_probe()
174 	led->cdev.brightness = pdata->brightness;  in regulator_led_probe()
176 	/* Set the default led status */  in regulator_led_probe()
177 	regulator_led_brightness_set(&led->cdev, led->cdev.brightness);  in regulator_led_probe()
186 	led_classdev_unregister(&led->cdev);  in regulator_led_remove()
193 		   .name  = "leds-regulator",
204 MODULE_ALIAS("platform:leds-regulator");