leds-gpio.c 7.4 KB
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/*
 * LEDs driver for GPIOs
 *
 * Copyright (C) 2007 8D Technologies inc.
 * Raphael Assenat <raph@8d.com>
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 * Copyright (C) 2008 Freescale Semiconductor, Inc.
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 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
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#include <linux/gpio.h>
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#include <linux/leds.h>
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#include <linux/of_platform.h>
#include <linux/of_gpio.h>
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#include <linux/slab.h>
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#include <linux/workqueue.h>
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#include <linux/module.h>
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struct gpio_led_data {
	struct led_classdev cdev;
	unsigned gpio;
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	struct work_struct work;
	u8 new_level;
	u8 can_sleep;
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	u8 active_low;
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	u8 blinking;
	int (*platform_gpio_blink_set)(unsigned gpio, int state,
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			unsigned long *delay_on, unsigned long *delay_off);
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};

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static void gpio_led_work(struct work_struct *work)
{
	struct gpio_led_data	*led_dat =
		container_of(work, struct gpio_led_data, work);

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	if (led_dat->blinking) {
		led_dat->platform_gpio_blink_set(led_dat->gpio,
						 led_dat->new_level,
						 NULL, NULL);
		led_dat->blinking = 0;
	} else
		gpio_set_value_cansleep(led_dat->gpio, led_dat->new_level);
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}
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static void gpio_led_set(struct led_classdev *led_cdev,
	enum led_brightness value)
{
	struct gpio_led_data *led_dat =
		container_of(led_cdev, struct gpio_led_data, cdev);
	int level;

	if (value == LED_OFF)
		level = 0;
	else
		level = 1;

	if (led_dat->active_low)
		level = !level;

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	/* Setting GPIOs with I2C/etc requires a task context, and we don't
	 * seem to have a reliable way to know if we're already in one; so
	 * let's just assume the worst.
	 */
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	if (led_dat->can_sleep) {
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		led_dat->new_level = level;
		schedule_work(&led_dat->work);
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	} else {
		if (led_dat->blinking) {
			led_dat->platform_gpio_blink_set(led_dat->gpio, level,
							 NULL, NULL);
			led_dat->blinking = 0;
		} else
			gpio_set_value(led_dat->gpio, level);
	}
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}

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static int gpio_blink_set(struct led_classdev *led_cdev,
	unsigned long *delay_on, unsigned long *delay_off)
{
	struct gpio_led_data *led_dat =
		container_of(led_cdev, struct gpio_led_data, cdev);

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	led_dat->blinking = 1;
	return led_dat->platform_gpio_blink_set(led_dat->gpio, GPIO_LED_BLINK,
						delay_on, delay_off);
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}

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static int __devinit create_gpio_led(const struct gpio_led *template,
	struct gpio_led_data *led_dat, struct device *parent,
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	int (*blink_set)(unsigned, int, unsigned long *, unsigned long *))
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{
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	int ret, state;
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	led_dat->gpio = -1;

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	/* skip leds that aren't available */
	if (!gpio_is_valid(template->gpio)) {
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		printk(KERN_INFO "Skipping unavailable LED gpio %d (%s)\n",
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				template->gpio, template->name);
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		return 0;
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	}

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	ret = gpio_request(template->gpio, template->name);
	if (ret < 0)
		return ret;

	led_dat->cdev.name = template->name;
	led_dat->cdev.default_trigger = template->default_trigger;
	led_dat->gpio = template->gpio;
	led_dat->can_sleep = gpio_cansleep(template->gpio);
	led_dat->active_low = template->active_low;
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	led_dat->blinking = 0;
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	if (blink_set) {
		led_dat->platform_gpio_blink_set = blink_set;
		led_dat->cdev.blink_set = gpio_blink_set;
	}
	led_dat->cdev.brightness_set = gpio_led_set;
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	if (template->default_state == LEDS_GPIO_DEFSTATE_KEEP)
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		state = !!gpio_get_value_cansleep(led_dat->gpio) ^ led_dat->active_low;
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	else
		state = (template->default_state == LEDS_GPIO_DEFSTATE_ON);
	led_dat->cdev.brightness = state ? LED_FULL : LED_OFF;
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	if (!template->retain_state_suspended)
		led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
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	ret = gpio_direction_output(led_dat->gpio, led_dat->active_low ^ state);
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	if (ret < 0)
		goto err;
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	INIT_WORK(&led_dat->work, gpio_led_work);

	ret = led_classdev_register(parent, &led_dat->cdev);
	if (ret < 0)
		goto err;

	return 0;
err:
	gpio_free(led_dat->gpio);
	return ret;
}

static void delete_gpio_led(struct gpio_led_data *led)
{
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	if (!gpio_is_valid(led->gpio))
		return;
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	led_classdev_unregister(&led->cdev);
	cancel_work_sync(&led->work);
	gpio_free(led->gpio);
}

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struct gpio_leds_priv {
	int num_leds;
	struct gpio_led_data leds[];
};
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static inline int sizeof_gpio_leds_priv(int num_leds)
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{
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	return sizeof(struct gpio_leds_priv) +
		(sizeof(struct gpio_led_data) * num_leds);
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}

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/* Code to create from OpenFirmware platform devices */
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#ifdef CONFIG_OF_GPIO
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static struct gpio_leds_priv * __devinit gpio_leds_create_of(struct platform_device *pdev)
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{
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	struct device_node *np = pdev->dev.of_node, *child;
	struct gpio_leds_priv *priv;
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	int count = 0, ret;

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	/* count LEDs in this device, so we know how much to allocate */
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	for_each_child_of_node(np, child)
		count++;
	if (!count)
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		return NULL;
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	priv = devm_kzalloc(&pdev->dev, sizeof_gpio_leds_priv(count),
			GFP_KERNEL);
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	if (!priv)
		return NULL;
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	for_each_child_of_node(np, child) {
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		struct gpio_led led = {};
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		enum of_gpio_flags flags;
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		const char *state;
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		led.gpio = of_get_gpio_flags(child, 0, &flags);
		led.active_low = flags & OF_GPIO_ACTIVE_LOW;
		led.name = of_get_property(child, "label", NULL) ? : child->name;
		led.default_trigger =
			of_get_property(child, "linux,default-trigger", NULL);
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		state = of_get_property(child, "default-state", NULL);
		if (state) {
			if (!strcmp(state, "keep"))
				led.default_state = LEDS_GPIO_DEFSTATE_KEEP;
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			else if (!strcmp(state, "on"))
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				led.default_state = LEDS_GPIO_DEFSTATE_ON;
			else
				led.default_state = LEDS_GPIO_DEFSTATE_OFF;
		}
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		ret = create_gpio_led(&led, &priv->leds[priv->num_leds++],
				      &pdev->dev, NULL);
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		if (ret < 0) {
			of_node_put(child);
			goto err;
		}
	}

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	return priv;
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err:
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	for (count = priv->num_leds - 2; count >= 0; count--)
		delete_gpio_led(&priv->leds[count]);
	return NULL;
}
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static const struct of_device_id of_gpio_leds_match[] = {
	{ .compatible = "gpio-leds", },
	{},
};
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#else /* CONFIG_OF_GPIO */
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static struct gpio_leds_priv * __devinit gpio_leds_create_of(struct platform_device *pdev)
{
	return NULL;
}
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#endif /* CONFIG_OF_GPIO */
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static int __devinit gpio_led_probe(struct platform_device *pdev)
{
	struct gpio_led_platform_data *pdata = pdev->dev.platform_data;
	struct gpio_leds_priv *priv;
	int i, ret = 0;

	if (pdata && pdata->num_leds) {
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		priv = devm_kzalloc(&pdev->dev,
				sizeof_gpio_leds_priv(pdata->num_leds),
					GFP_KERNEL);
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		if (!priv)
			return -ENOMEM;

		priv->num_leds = pdata->num_leds;
		for (i = 0; i < priv->num_leds; i++) {
			ret = create_gpio_led(&pdata->leds[i],
					      &priv->leds[i],
					      &pdev->dev, pdata->gpio_blink_set);
			if (ret < 0) {
				/* On failure: unwind the led creations */
				for (i = i - 1; i >= 0; i--)
					delete_gpio_led(&priv->leds[i]);
				return ret;
			}
		}
	} else {
		priv = gpio_leds_create_of(pdev);
		if (!priv)
			return -ENODEV;
	}

	platform_set_drvdata(pdev, priv);

	return 0;
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}

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static int __devexit gpio_led_remove(struct platform_device *pdev)
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{
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	struct gpio_leds_priv *priv = platform_get_drvdata(pdev);
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	int i;

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	for (i = 0; i < priv->num_leds; i++)
		delete_gpio_led(&priv->leds[i]);
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	platform_set_drvdata(pdev, NULL);
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	return 0;
}

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static struct platform_driver gpio_led_driver = {
	.probe		= gpio_led_probe,
	.remove		= __devexit_p(gpio_led_remove),
	.driver		= {
		.name	= "leds-gpio",
		.owner	= THIS_MODULE,
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		.of_match_table = of_match_ptr(of_gpio_leds_match),
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	},
};
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module_platform_driver(gpio_led_driver);
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MODULE_AUTHOR("Raphael Assenat <raph@8d.com>, Trent Piepho <tpiepho@freescale.com>");
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MODULE_DESCRIPTION("GPIO LED driver");
MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:leds-gpio");
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