xref: /openbmc/u-boot/drivers/led/led-uclass.c (revision 4a2b2724)
1 /*
2  * Copyright (c) 2015 Google, Inc
3  * Written by Simon Glass <sjg@chromium.org>
4  *
5  * SPDX-License-Identifier:	GPL-2.0+
6  */
7 
8 #include <common.h>
9 #include <dm.h>
10 #include <errno.h>
11 #include <led.h>
12 #include <dm/root.h>
13 #include <dm/uclass-internal.h>
14 
15 int led_get_by_label(const char *label, struct udevice **devp)
16 {
17 	struct udevice *dev;
18 	struct uclass *uc;
19 	int ret;
20 
21 	ret = uclass_get(UCLASS_LED, &uc);
22 	if (ret)
23 		return ret;
24 	uclass_foreach_dev(dev, uc) {
25 		struct led_uc_plat *uc_plat = dev_get_uclass_platdata(dev);
26 
27 		/* Ignore the top-level LED node */
28 		if (uc_plat->label && !strcmp(label, uc_plat->label))
29 			return uclass_get_device_tail(dev, 0, devp);
30 	}
31 
32 	return -ENODEV;
33 }
34 
35 int led_set_state(struct udevice *dev, enum led_state_t state)
36 {
37 	struct led_ops *ops = led_get_ops(dev);
38 
39 	if (!ops->set_state)
40 		return -ENOSYS;
41 
42 	return ops->set_state(dev, state);
43 }
44 
45 enum led_state_t led_get_state(struct udevice *dev)
46 {
47 	struct led_ops *ops = led_get_ops(dev);
48 
49 	if (!ops->get_state)
50 		return -ENOSYS;
51 
52 	return ops->get_state(dev);
53 }
54 
55 #ifdef CONFIG_LED_BLINK
56 int led_set_period(struct udevice *dev, int period_ms)
57 {
58 	struct led_ops *ops = led_get_ops(dev);
59 
60 	if (!ops->set_period)
61 		return -ENOSYS;
62 
63 	return ops->set_period(dev, period_ms);
64 }
65 #endif
66 
67 UCLASS_DRIVER(led) = {
68 	.id		= UCLASS_LED,
69 	.name		= "led",
70 	.per_device_platdata_auto_alloc_size = sizeof(struct led_uc_plat),
71 };
72