1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * Generic Syscon LEDs Driver
14 #include <linux/mfd/syscon.h>
19  * struct syscon_led - state container for syscon based LEDs
21  * @map: regmap to access the syscon device backing this LED
22  * @offset: the offset into the syscon regmap for the LED register
44 		sled->state = false;  in syscon_led_set()
46 		val = sled->mask;  in syscon_led_set()
47 		sled->state = true;  in syscon_led_set()
50 	ret = regmap_update_bits(sled->map, sled->offset, sled->mask, val);  in syscon_led_set()
52 		dev_err(sled->cdev.dev, "error updating LED status\n");  in syscon_led_set()
58 	struct device *dev = &pdev->dev;  in syscon_led_probe()  local
59 	struct device_node *np = dev_of_node(dev);  in syscon_led_probe()
67 	parent = dev->parent;  in syscon_led_probe()
69 		dev_err(dev, "no parent for syscon LED\n");  in syscon_led_probe()
70 		return -ENODEV;  in syscon_led_probe()
74 		dev_err(dev, "no regmap for syscon LED parent\n");  in syscon_led_probe()
78 	sled = devm_kzalloc(dev, sizeof(*sled), GFP_KERNEL);  in syscon_led_probe()
80 		return -ENOMEM;  in syscon_led_probe()
82 	sled->map = map;  in syscon_led_probe()
84 	if (of_property_read_u32(np, "reg", &sled->offset) &&  in syscon_led_probe()
85 	    of_property_read_u32(np, "offset", &sled->offset))  in syscon_led_probe()
86 		return -EINVAL;  in syscon_led_probe()
87 	if (of_property_read_u32(np, "mask", &sled->mask))  in syscon_led_probe()
88 		return -EINVAL;  in syscon_led_probe()
95 		ret = regmap_update_bits(map, sled->offset, sled->mask, sled->mask);  in syscon_led_probe()
98 		sled->state = true;  in syscon_led_probe()
101 		ret = regmap_read(map, sled->offset, &value);  in syscon_led_probe()
104 		sled->state = !!(value & sled->mask);  in syscon_led_probe()
107 		ret = regmap_update_bits(map, sled->offset, sled->mask, 0);  in syscon_led_probe()
110 		sled->state = false;  in syscon_led_probe()
112 	sled->cdev.brightness_set = syscon_led_set;  in syscon_led_probe()
114 	ret = devm_led_classdev_register_ext(dev, &sled->cdev, &init_data);  in syscon_led_probe()
119 	dev_info(dev, "registered LED %s\n", sled->cdev.name);  in syscon_led_probe()
125 	{ .compatible = "register-bit-led", },
132 		.name	= "leds-syscon",