[people/ms/u-boot.git] / drivers / led / led_gpio.c

/*
 * Copyright (c) 2015 Google, Inc
 * Written by Simon Glass <sjg@chromium.org>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

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

DECLARE_GLOBAL_DATA_PTR;

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,
};
Commit	Line	Data
5ac76bad SG	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 <asm/gpio.h>
	13	#include <dm/lists.h>
	14
	15	DECLARE_GLOBAL_DATA_PTR;
	16
	17	struct led_gpio_priv {
	18	struct gpio_desc gpio;
	19	};
	20
ddae9fcd	21	static int gpio_led_set_state(struct udevice *dev, enum led_state_t state)
5ac76bad SG	22	{
5ac76bad SG	23	struct led_gpio_priv *priv = dev_get_priv(dev);
9413ad4f	24	int ret;
5ac76bad SG	25
	26	if (!dm_gpio_is_valid(&priv->gpio))
	27	return -EREMOTEIO;
8f4b6123 SG	28	switch (state) {
	29	case LEDST_OFF:
	30	case LEDST_ON:
	31	break;
9413ad4f SG	32	case LEDST_TOGGLE:
	33	ret = dm_gpio_get_value(&priv->gpio);
	34	if (ret < 0)
	35	return ret;
	36	state = !ret;
	37	break;
8f4b6123 SG	38	default:
	39	return -ENOSYS;
	40	}
5ac76bad	41
ddae9fcd	42	return dm_gpio_set_value(&priv->gpio, state);
5ac76bad SG	43	}
5ac76bad SG	44
8f4b6123 SG	45	static enum led_state_t gpio_led_get_state(struct udevice *dev)
	46	{
	47	struct led_gpio_priv *priv = dev_get_priv(dev);
	48	int ret;
	49
	50	if (!dm_gpio_is_valid(&priv->gpio))
	51	return -EREMOTEIO;
	52	ret = dm_gpio_get_value(&priv->gpio);
	53	if (ret < 0)
	54	return ret;
	55
	56	return ret ? LEDST_ON : LEDST_OFF;
	57	}
	58
5ac76bad SG	59	static int led_gpio_probe(struct udevice *dev)
5ac76bad SG	60	{
56e19871	61	struct led_uc_plat *uc_plat = dev_get_uclass_platdata(dev);
5ac76bad SG	62	struct led_gpio_priv *priv = dev_get_priv(dev);
	63
	64	/* Ignore the top-level LED node */
	65	if (!uc_plat->label)
	66	return 0;
	67	return gpio_request_by_name(dev, "gpios", 0, &priv->gpio, GPIOD_IS_OUT);
	68	}
	69
	70	static int led_gpio_remove(struct udevice *dev)
	71	{
3c43fba3 SG	72	/*
	73	* The GPIO driver may have already been removed. We will need to
	74	* address this more generally.
	75	*/
	76	#ifndef CONFIG_SANDBOX
5ac76bad SG	77	struct led_gpio_priv *priv = dev_get_priv(dev);
	78
	79	if (dm_gpio_is_valid(&priv->gpio))
	80	dm_gpio_free(dev, &priv->gpio);
3c43fba3	81	#endif
5ac76bad SG	82
	83	return 0;
	84	}
	85
	86	static int led_gpio_bind(struct udevice *parent)
	87	{
5ac76bad	88	struct udevice *dev;
45a26867	89	ofnode node;
5ac76bad SG	90	int ret;
5ac76bad SG	91
45a26867	92	dev_for_each_subnode(node, parent) {
56e19871	93	struct led_uc_plat *uc_plat;
5ac76bad SG	94	const char *label;
5ac76bad SG	95
45a26867	96	label = ofnode_read_string(node, "label");
5ac76bad SG	97	if (!label) {
5ac76bad SG	98	debug("%s: node %s has no label\n", __func__,
45a26867	99	ofnode_get_name(node));
5ac76bad SG	100	return -EINVAL;
	101	}
	102	ret = device_bind_driver_to_node(parent, "gpio_led",
45a26867	103	ofnode_get_name(node),
5ac76bad SG	104	node, &dev);
	105	if (ret)
	106	return ret;
	107	uc_plat = dev_get_uclass_platdata(dev);
	108	uc_plat->label = label;
	109	}
	110
	111	return 0;
	112	}
	113
	114	static const struct led_ops gpio_led_ops = {
ddae9fcd	115	.set_state = gpio_led_set_state,
8f4b6123	116	.get_state = gpio_led_get_state,
5ac76bad SG	117	};
	118
	119	static const struct udevice_id led_gpio_ids[] = {
	120	{ .compatible = "gpio-leds" },
	121	{ }
	122	};
	123
	124	U_BOOT_DRIVER(led_gpio) = {
	125	.name = "gpio_led",
	126	.id = UCLASS_LED,
	127	.of_match = led_gpio_ids,
	128	.ops = &gpio_led_ops,
	129	.priv_auto_alloc_size = sizeof(struct led_gpio_priv),
	130	.bind = led_gpio_bind,
	131	.probe = led_gpio_probe,
	132	.remove = led_gpio_remove,
	133	};