1 // SPDX-License-Identifier: GPL-2.0-only
3  * linux/drivers/leds-pwm.c
9  * based on leds-gpio.c by Raphael Assenat <raph@8d.com>
16 #include <linux/leds.h>
36 	struct led_pwm_data leds[];  member
44 	unsigned int max = led_dat->cdev.max_brightness;  in led_pwm_set()
45 	unsigned long long duty = led_dat->pwmstate.period;  in led_pwm_set()
50 	if (led_dat->active_low)  in led_pwm_set()
51 		duty = led_dat->pwmstate.period - duty;  in led_pwm_set()
53 	led_dat->pwmstate.duty_cycle = duty;  in led_pwm_set()
54 	led_dat->pwmstate.enabled = duty > 0;  in led_pwm_set()
55 	return pwm_apply_state(led_dat->pwm, &led_dat->pwmstate);  in led_pwm_set()
62 	struct led_pwm_data *led_data = &priv->leds[priv->num_leds];  in led_pwm_add()
66 	led_data->active_low = led->active_low;  in led_pwm_add()
67 	led_data->cdev.name = led->name;  in led_pwm_add()
68 	led_data->cdev.brightness = LED_OFF;  in led_pwm_add()
69 	led_data->cdev.max_brightness = led->max_brightness;  in led_pwm_add()
70 	led_data->cdev.flags = LED_CORE_SUSPENDRESUME;  in led_pwm_add()
72 	led_data->pwm = devm_fwnode_pwm_get(dev, fwnode, NULL);  in led_pwm_add()
73 	if (IS_ERR(led_data->pwm))  in led_pwm_add()
74 		return dev_err_probe(dev, PTR_ERR(led_data->pwm),  in led_pwm_add()
76 				     led->name);  in led_pwm_add()
78 	led_data->cdev.brightness_set_blocking = led_pwm_set;  in led_pwm_add()
80 	pwm_init_state(led_data->pwm, &led_data->pwmstate);  in led_pwm_add()
82 	ret = devm_led_classdev_register_ext(dev, &led_data->cdev, &init_data);  in led_pwm_add()
85 			led->name, ret);  in led_pwm_add()
89 	ret = led_pwm_set(&led_data->cdev, led_data->cdev.brightness);  in led_pwm_add()
92 			led->name, ret);  in led_pwm_add()
96 	priv->num_leds++;  in led_pwm_add()
111 			led.name = to_of_node(fwnode)->name;  in led_pwm_create_fwnode()
115 			return -EINVAL;  in led_pwm_create_fwnode()
119 							   "active-low");  in led_pwm_create_fwnode()
120 		fwnode_property_read_u32(fwnode, "max-brightness",  in led_pwm_create_fwnode()
139 	count = device_get_child_node_count(&pdev->dev);  in led_pwm_probe()
142 		return -EINVAL;  in led_pwm_probe()
144 	priv = devm_kzalloc(&pdev->dev, struct_size(priv, leds, count),  in led_pwm_probe()
147 		return -ENOMEM;  in led_pwm_probe()
149 	ret = led_pwm_create_fwnode(&pdev->dev, priv);  in led_pwm_probe()
160 	{ .compatible = "pwm-leds", },
178 MODULE_ALIAS("platform:leds-pwm");