summaryrefslogtreecommitdiffstats
path: root/drivers/led/led-gpio.c
blob: 0590e3fa3e9ef1640a8943040384dea1aa08e6dd (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
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
/*
 * gpio LED support for barebox
 *
 * (C) Copyright 2010 Sascha Hauer, Pengutronix
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */
#include <common.h>
#include <init.h>
#include <led.h>
#include <malloc.h>
#include <gpio.h>
#include <of_gpio.h>

static void led_gpio_set(struct led *led, unsigned int value)
{
	struct gpio_led *gpio_led = container_of(led, struct gpio_led, led);

	gpio_direction_output(gpio_led->gpio, !!value ^ gpio_led->active_low);
}

/**
 * led_gpio_register - register a gpio controlled LED
 * @param led	The gpio LED
 *
 * This function registers a single gpio as a LED. led->gpio
 * should be initialized to the gpio to control.
 */
int led_gpio_register(struct gpio_led *led)
{
	int ret;
	char *name = led->led.name;

	ret = gpio_request(led->gpio, name ? name : "led");
	if (ret)
		return ret;

	led->led.set = led_gpio_set;
	led->led.max_value = 1;

	ret = led_register(&led->led);
	if (ret)
		gpio_free(led->gpio);

	return ret;
}

/**
 * led_gpio_unregister - remove a gpio controlled LED from the framework
 * @param led	The gpio LED
 */
void led_gpio_unregister(struct gpio_led *led)
{
	led_unregister(&led->led);
	gpio_free(led->gpio);
}

#ifdef CONFIG_LED_GPIO_BICOLOR
static void led_gpio_bicolor_set(struct led *led, unsigned int value)
{
	struct gpio_bicolor_led *bi = container_of(led, struct gpio_bicolor_led, led);
	int al = bi->active_low;

	switch (value) {
	case 0:
		gpio_direction_output(bi->gpio_c0, al);
		gpio_direction_output(bi->gpio_c1, al);
		break;
	case 1:
		gpio_direction_output(bi->gpio_c0, !al);
		gpio_direction_output(bi->gpio_c1, al);
		break;
	case 2:
		gpio_direction_output(bi->gpio_c0, al);
		gpio_direction_output(bi->gpio_c1, !al);
		break;
	}
}

/**
 * led_gpio_bicolor_register - register three gpios as a bicolor LED
 * @param led	The gpio bicolor LED
 *
 * This function registers three gpios as a bicolor LED. led->gpio[rg]
 * should be initialized to the gpios to control.
 */
int led_gpio_bicolor_register(struct gpio_bicolor_led *led)
{
	int ret;
	char *name = led->led.name;

	ret = gpio_request(led->gpio_c0, name ? name : "led_c0");
	if (ret)
		return ret;

	ret = gpio_request(led->gpio_c1, name ? name : "led_c1");
	if (ret)
		goto err_gpio_c0;

	led->led.set = led_gpio_bicolor_set;
	led->led.max_value = 2;

	ret = led_register(&led->led);
	if (ret)
		goto err_gpio_c1;

	return 0;

err_gpio_c1:
	gpio_free(led->gpio_c1);
err_gpio_c0:
	gpio_free(led->gpio_c0);
	return ret;
}

/**
 * led_gpio_bicolor_unregister - remove a gpio controlled bicolor LED from the framework
 * @param led	The gpio LED
 */
void led_gpio_bicolor_unregister(struct gpio_bicolor_led *led)
{
	led_unregister(&led->led);
	gpio_free(led->gpio_c1);
	gpio_free(led->gpio_c0);
}
#endif

#ifdef CONFIG_LED_GPIO_RGB

static void led_gpio_rgb_set(struct led *led, unsigned int value)
{
	struct gpio_rgb_led *rgb = container_of(led, struct gpio_rgb_led, led);
	int al = rgb->active_low;

	gpio_direction_output(rgb->gpio_r, !!(value & 4) ^ al);
	gpio_direction_output(rgb->gpio_g, !!(value & 2) ^ al);
	gpio_direction_output(rgb->gpio_b, !!(value & 1) ^ al);
}

/**
 * led_gpio_rgb_register - register three gpios as a rgb LED
 * @param led	The gpio rg LED
 *
 * This function registers three gpios as a rgb LED. led->gpio[rgb]
 * should be initialized to the gpios to control.
 */
int led_gpio_rgb_register(struct gpio_rgb_led *led)
{
	int ret;
	char *name = led->led.name;

	ret = gpio_request(led->gpio_r, name ? name : "led_r");
	if (ret)
		return ret;

	ret = gpio_request(led->gpio_g, name ? name : "led_g");
	if (ret)
		goto err_gpio_r;

	ret = gpio_request(led->gpio_b, name ? name : "led_b");
	if (ret)
		goto err_gpio_g;

	led->led.set = led_gpio_rgb_set;
	led->led.max_value = 7;

	ret = led_register(&led->led);
	if (ret)
		goto err_gpio_b;

	return 0;

err_gpio_b:
	gpio_free(led->gpio_b);
err_gpio_g:
	gpio_free(led->gpio_g);
err_gpio_r:
	gpio_free(led->gpio_r);
	return ret;
}

/**
 * led_gpio_rgb_unregister - remove a gpio controlled rgb LED from the framework
 * @param led	The gpio LED
 */
void led_gpio_rgb_unregister(struct gpio_rgb_led *led)
{
	led_unregister(&led->led);
	gpio_free(led->gpio_b);
	gpio_free(led->gpio_g);
	gpio_free(led->gpio_r);
}
#endif /* CONFIG_LED_GPIO_RGB */

#ifdef CONFIG_LED_GPIO_OF
static int led_gpio_of_probe(struct device_d *dev)
{
	struct device_node *child;
	struct gpio_led *leds;
	int num_leds;
	int ret = 0, n = 0;

	num_leds = of_get_child_count(dev->device_node);
	if (num_leds <= 0)
		return num_leds;

	leds = xzalloc(num_leds * sizeof(struct gpio_led));

	for_each_child_of_node(dev->device_node, child) {
		struct gpio_led *gled = &leds[n];
		const char *default_state;
		enum of_gpio_flags flags;
		int gpio;
		const char *label;

		gpio = of_get_named_gpio_flags(child, "gpios", 0, &flags);
		if (gpio < 0) {
			if (gpio != -EPROBE_DEFER)
				dev_err(dev, "failed to get gpio for %s: %d\n",
					child->full_name, gpio);
			ret = gpio;
			goto err;
		}

		if (of_property_read_string(child, "label", &label))
			label = child->name;
		gled->led.name = xstrdup(label);

		gled->gpio = gpio;
		gled->active_low = (flags & OF_GPIO_ACTIVE_LOW) ? 1 : 0;

		dev_dbg(dev, "register led %s on gpio%d, active_low = %d\n",
			gled->led.name, gled->gpio, gled->active_low);

		led_gpio_register(gled);
		led_of_parse_trigger(&gled->led, child);

		if (!of_property_read_string(child, "default-state", &default_state)) {
			if (!strcmp(default_state, "on"))
				led_gpio_set(&gled->led, 1);
			else if (!strcmp(default_state, "off"))
				led_gpio_set(&gled->led, 0);
		}

		n++;
	}

	return 0;

err:
	for (n = n - 1; n >= 0; n--)
		led_gpio_unregister(&leds[n]);
	free(leds);
	return ret;
}

static struct of_device_id led_gpio_of_ids[] = {
	{ .compatible = "gpio-leds", },
	{ }
};

static struct driver_d led_gpio_of_driver = {
	.name  = "gpio-leds",
	.probe = led_gpio_of_probe,
	.of_compatible = DRV_OF_COMPAT(led_gpio_of_ids),
};
device_platform_driver(led_gpio_of_driver);

#endif /* CONFIG LED_GPIO_OF */