summaryrefslogtreecommitdiff
path: root/drivers/led/led_gpio.c
blob: b26f7a730cf4955c4f2228d3b1a5b4e57cc85794 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (c) 2015 Google, Inc
 * Written by Simon Glass <sjg@chromium.org>
 */

#include <common.h>
#include <dm.h>
#include <errno.h>
#include <led.h>
#include <asm/gpio.h>
#include <dm/lists.h>

struct led_gpio_priv {
	struct gpio_desc gpio;
};

static int gpio_led_set_state(struct udevice *dev, enum led_state_t state)
{
	struct led_gpio_priv *priv = dev_get_priv(dev);
	int ret;

	if (!dm_gpio_is_valid(&priv->gpio))
		return -EREMOTEIO;
	switch (state) {
	case LEDST_OFF:
	case LEDST_ON:
		break;
	case LEDST_TOGGLE:
		ret = dm_gpio_get_value(&priv->gpio);
		if (ret < 0)
			return ret;
		state = !ret;
		break;
	default:
		return -ENOSYS;
	}

	return dm_gpio_set_value(&priv->gpio, state);
}

static enum led_state_t gpio_led_get_state(struct udevice *dev)
{
	struct led_gpio_priv *priv = dev_get_priv(dev);
	int ret;

	if (!dm_gpio_is_valid(&priv->gpio))
		return -EREMOTEIO;
	ret = dm_gpio_get_value(&priv->gpio);
	if (ret < 0)
		return ret;

	return ret ? LEDST_ON : LEDST_OFF;
}

static int led_gpio_probe(struct udevice *dev)
{
	struct led_uc_plat *uc_plat = dev_get_uclass_platdata(dev);
	struct led_gpio_priv *priv = dev_get_priv(dev);

	/* Ignore the top-level LED node */
	if (!uc_plat->label)
		return 0;
	return gpio_request_by_name(dev, "gpios", 0, &priv->gpio, GPIOD_IS_OUT);
}

static int led_gpio_remove(struct udevice *dev)
{
	/*
	 * The GPIO driver may have already been removed. We will need to
	 * address this more generally.
	 */
#ifndef CONFIG_SANDBOX
	struct led_gpio_priv *priv = dev_get_priv(dev);

	if (dm_gpio_is_valid(&priv->gpio))
		dm_gpio_free(dev, &priv->gpio);
#endif

	return 0;
}

static int led_gpio_bind(struct udevice *parent)
{
	struct udevice *dev;
	ofnode node;
	int ret;

	dev_for_each_subnode(node, parent) {
		struct led_uc_plat *uc_plat;
		const char *label;

		label = ofnode_read_string(node, "label");
		if (!label) {
			debug("%s: node %s has no label\n", __func__,
			      ofnode_get_name(node));
			return -EINVAL;
		}
		ret = device_bind_driver_to_node(parent, "gpio_led",
						 ofnode_get_name(node),
						 node, &dev);
		if (ret)
			return ret;
		uc_plat = dev_get_uclass_platdata(dev);
		uc_plat->label = label;
	}

	return 0;
}

static const struct led_ops gpio_led_ops = {
	.set_state	= gpio_led_set_state,
	.get_state	= gpio_led_get_state,
};

static const struct udevice_id led_gpio_ids[] = {
	{ .compatible = "gpio-leds" },
	{ }
};

U_BOOT_DRIVER(led_gpio) = {
	.name	= "gpio_led",
	.id	= UCLASS_LED,
	.of_match = led_gpio_ids,
	.ops	= &gpio_led_ops,
	.priv_auto_alloc_size = sizeof(struct led_gpio_priv),
	.bind	= led_gpio_bind,
	.probe	= led_gpio_probe,
	.remove	= led_gpio_remove,
};