drivers/leds/leds-gpio.c - kernel/msm-4.9 - Gitiles

 /*
  * LEDs driver for GPIOs
  *
  * Copyright (C) 2007 8D Technologies inc.
  * Raphael Assenat <raph@8d.com>
  * Copyright (C) 2008 Freescale Semiconductor, Inc.
  *
  * 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>
 #include <linux/leds.h>
 #include <linux/slab.h>
 #include <linux/workqueue.h>

 #include <asm/gpio.h>

 struct gpio_led_data {
 	struct led_classdev cdev;
 	unsigned gpio;
 	struct work_struct work;
 	u8 new_level;
 	u8 can_sleep;
 	u8 active_low;
 	u8 blinking;
 	int (*platform_gpio_blink_set)(unsigned gpio, int state,
 			unsigned long *delay_on, unsigned long *delay_off);
 };

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

 	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);
 }

 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;

 	/* 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.
 	 */
 	if (led_dat->can_sleep) {
 		led_dat->new_level = level;
 		schedule_work(&led_dat->work);
 	} 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);
 	}
 }

 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);

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

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

 	led_dat->gpio = -1;

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

 	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;
 	led_dat->blinking = 0;
 	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;
 	if (template->default_state == LEDS_GPIO_DEFSTATE_KEEP)
 		state = !!gpio_get_value(led_dat->gpio) ^ led_dat->active_low;
 	else
 		state = (template->default_state == LEDS_GPIO_DEFSTATE_ON);
 	led_dat->cdev.brightness = state ? LED_FULL : LED_OFF;
 	if (!template->retain_state_suspended)
 		led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;

 	ret = gpio_direction_output(led_dat->gpio, led_dat->active_low ^ state);
 	if (ret < 0)
 		goto err;

 	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)
 {
 	if (!gpio_is_valid(led->gpio))
 		return;
 	led_classdev_unregister(&led->cdev);
 	cancel_work_sync(&led->work);
 	gpio_free(led->gpio);
 }

 #ifdef CONFIG_LEDS_GPIO_PLATFORM
 static int __devinit gpio_led_probe(struct platform_device *pdev)
 {
 	struct gpio_led_platform_data *pdata = pdev->dev.platform_data;
 	struct gpio_led_data *leds_data;
 	int i, ret = 0;

 	if (!pdata)
 		return -EBUSY;

 	leds_data = kzalloc(sizeof(struct gpio_led_data) * pdata->num_leds,
 				GFP_KERNEL);
 	if (!leds_data)
 		return -ENOMEM;

 	for (i = 0; i < pdata->num_leds; i++) {
 		ret = create_gpio_led(&pdata->leds[i], &leds_data[i],
 				      &pdev->dev, pdata->gpio_blink_set);
 		if (ret < 0)
 			goto err;
 	}

 	platform_set_drvdata(pdev, leds_data);

 	return 0;

 err:
 	for (i = i - 1; i >= 0; i--)
 		delete_gpio_led(&leds_data[i]);

 	kfree(leds_data);

 	return ret;
 }

 static int __devexit gpio_led_remove(struct platform_device *pdev)
 {
 	int i;
 	struct gpio_led_platform_data *pdata = pdev->dev.platform_data;
 	struct gpio_led_data *leds_data;

 	leds_data = platform_get_drvdata(pdev);

 	for (i = 0; i < pdata->num_leds; i++)
 		delete_gpio_led(&leds_data[i]);

 	kfree(leds_data);

 	return 0;
 }

 static struct platform_driver gpio_led_driver = {
 	.probe		= gpio_led_probe,
 	.remove		= __devexit_p(gpio_led_remove),
 	.driver		= {
 		.name	= "leds-gpio",
 		.owner	= THIS_MODULE,
 	},
 };

 MODULE_ALIAS("platform:leds-gpio");
 #endif /* CONFIG_LEDS_GPIO_PLATFORM */

 /* Code to create from OpenFirmware platform devices */
 #ifdef CONFIG_LEDS_GPIO_OF
 #include <linux/of_platform.h>
 #include <linux/of_gpio.h>

 struct gpio_led_of_platform_data {
 	int num_leds;
 	struct gpio_led_data led_data[];
 };

 static int __devinit of_gpio_leds_probe(struct of_device *ofdev,
 					const struct of_device_id *match)
 {
 	struct device_node *np = ofdev->dev.of_node, *child;
 	struct gpio_led_of_platform_data *pdata;
 	int count = 0, ret;

 	/* count LEDs defined by this device, so we know how much to allocate */
 	for_each_child_of_node(np, child)
 		count++;
 	if (!count)
 		return 0; /* or ENODEV? */

 	pdata = kzalloc(sizeof(*pdata) + sizeof(struct gpio_led_data) * count,
 			GFP_KERNEL);
 	if (!pdata)
 		return -ENOMEM;

 	for_each_child_of_node(np, child) {
 		struct gpio_led led = {};
 		enum of_gpio_flags flags;
 		const char *state;

 		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);
 		state = of_get_property(child, "default-state", NULL);
 		if (state) {
 			if (!strcmp(state, "keep"))
 				led.default_state = LEDS_GPIO_DEFSTATE_KEEP;
 			else if(!strcmp(state, "on"))
 				led.default_state = LEDS_GPIO_DEFSTATE_ON;
 			else
 				led.default_state = LEDS_GPIO_DEFSTATE_OFF;
 		}

 		ret = create_gpio_led(&led, &pdata->led_data[pdata->num_leds++],
 				      &ofdev->dev, NULL);
 		if (ret < 0) {
 			of_node_put(child);
 			goto err;
 		}
 	}

 	dev_set_drvdata(&ofdev->dev, pdata);

 	return 0;

 err:
 	for (count = pdata->num_leds - 2; count >= 0; count--)
 		delete_gpio_led(&pdata->led_data[count]);

 	kfree(pdata);

 	return ret;
 }

 static int __devexit of_gpio_leds_remove(struct of_device *ofdev)
 {
 	struct gpio_led_of_platform_data *pdata = dev_get_drvdata(&ofdev->dev);
 	int i;

 	for (i = 0; i < pdata->num_leds; i++)
 		delete_gpio_led(&pdata->led_data[i]);

 	kfree(pdata);

 	dev_set_drvdata(&ofdev->dev, NULL);

 	return 0;
 }

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

 static struct of_platform_driver of_gpio_leds_driver = {
 	.driver = {
 		.name = "of_gpio_leds",
 		.owner = THIS_MODULE,
 		.of_match_table = of_gpio_leds_match,
 	},
 	.probe = of_gpio_leds_probe,
 	.remove = __devexit_p(of_gpio_leds_remove),
 };
 #endif

 static int __init gpio_led_init(void)
 {
 	int ret;

 #ifdef CONFIG_LEDS_GPIO_PLATFORM
 	ret = platform_driver_register(&gpio_led_driver);
 	if (ret)
 		return ret;
 #endif
 #ifdef CONFIG_LEDS_GPIO_OF
 	ret = of_register_platform_driver(&of_gpio_leds_driver);
 #endif
 #ifdef CONFIG_LEDS_GPIO_PLATFORM
 	if (ret)
 		platform_driver_unregister(&gpio_led_driver);
 #endif

 	return ret;
 }

 static void __exit gpio_led_exit(void)
 {
 #ifdef CONFIG_LEDS_GPIO_PLATFORM
 	platform_driver_unregister(&gpio_led_driver);
 #endif
 #ifdef CONFIG_LEDS_GPIO_OF
 	of_unregister_platform_driver(&of_gpio_leds_driver);
 #endif
 }

 module_init(gpio_led_init);
 module_exit(gpio_led_exit);

 MODULE_AUTHOR("Raphael Assenat <raph@8d.com>, Trent Piepho <tpiepho@freescale.com>");
 MODULE_DESCRIPTION("GPIO LED driver");
 MODULE_LICENSE("GPL");
	/*
	* LEDs driver for GPIOs
	*
	* Copyright (C) 2007 8D Technologies inc.
	* Raphael Assenat <raph@8d.com>
	* Copyright (C) 2008 Freescale Semiconductor, Inc.
	*
	* 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>
	#include <linux/leds.h>
	#include <linux/slab.h>
	#include <linux/workqueue.h>

	#include <asm/gpio.h>

	struct gpio_led_data {
	struct led_classdev cdev;
	unsigned gpio;
	struct work_struct work;
	u8 new_level;
	u8 can_sleep;
	u8 active_low;
	u8 blinking;
	int (*platform_gpio_blink_set)(unsigned gpio, int state,
	unsigned long delay_on, unsigned long delay_off);
	};

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

	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);
	}

	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;

	/* 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.
	*/
	if (led_dat->can_sleep) {
	led_dat->new_level = level;
	schedule_work(&led_dat->work);
	} 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);
	}
	}

	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);

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

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

	led_dat->gpio = -1;

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

	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;
	led_dat->blinking = 0;
	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;
	if (template->default_state == LEDS_GPIO_DEFSTATE_KEEP)
	state = !!gpio_get_value(led_dat->gpio) ^ led_dat->active_low;
	else
	state = (template->default_state == LEDS_GPIO_DEFSTATE_ON);
	led_dat->cdev.brightness = state ? LED_FULL : LED_OFF;
	if (!template->retain_state_suspended)
	led_dat->cdev.flags \|= LED_CORE_SUSPENDRESUME;

	ret = gpio_direction_output(led_dat->gpio, led_dat->active_low ^ state);
	if (ret < 0)
	goto err;

	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)
	{
	if (!gpio_is_valid(led->gpio))
	return;
	led_classdev_unregister(&led->cdev);
	cancel_work_sync(&led->work);
	gpio_free(led->gpio);
	}

	#ifdef CONFIG_LEDS_GPIO_PLATFORM
	static int __devinit gpio_led_probe(struct platform_device *pdev)
	{
	struct gpio_led_platform_data *pdata = pdev->dev.platform_data;
	struct gpio_led_data *leds_data;
	int i, ret = 0;

	if (!pdata)
	return -EBUSY;

	leds_data = kzalloc(sizeof(struct gpio_led_data) * pdata->num_leds,
	GFP_KERNEL);
	if (!leds_data)
	return -ENOMEM;

	for (i = 0; i < pdata->num_leds; i++) {
	ret = create_gpio_led(&pdata->leds[i], &leds_data[i],
	&pdev->dev, pdata->gpio_blink_set);
	if (ret < 0)
	goto err;
	}

	platform_set_drvdata(pdev, leds_data);

	return 0;

	err:
	for (i = i - 1; i >= 0; i--)
	delete_gpio_led(&leds_data[i]);

	kfree(leds_data);

	return ret;
	}

	static int __devexit gpio_led_remove(struct platform_device *pdev)
	{
	int i;
	struct gpio_led_platform_data *pdata = pdev->dev.platform_data;
	struct gpio_led_data *leds_data;

	leds_data = platform_get_drvdata(pdev);

	for (i = 0; i < pdata->num_leds; i++)
	delete_gpio_led(&leds_data[i]);

	kfree(leds_data);

	return 0;
	}

	static struct platform_driver gpio_led_driver = {
	.probe = gpio_led_probe,
	.remove = __devexit_p(gpio_led_remove),
	.driver = {
	.name = "leds-gpio",
	.owner = THIS_MODULE,
	},
	};

	MODULE_ALIAS("platform:leds-gpio");
	#endif /* CONFIG_LEDS_GPIO_PLATFORM */

	/* Code to create from OpenFirmware platform devices */
	#ifdef CONFIG_LEDS_GPIO_OF
	#include <linux/of_platform.h>
	#include <linux/of_gpio.h>

	struct gpio_led_of_platform_data {
	int num_leds;
	struct gpio_led_data led_data[];
	};

	static int __devinit of_gpio_leds_probe(struct of_device *ofdev,
	const struct of_device_id *match)
	{
	struct device_node np = ofdev->dev.of_node, child;
	struct gpio_led_of_platform_data *pdata;
	int count = 0, ret;

	/* count LEDs defined by this device, so we know how much to allocate */
	for_each_child_of_node(np, child)
	count++;
	if (!count)
	return 0; /* or ENODEV? */

	pdata = kzalloc(sizeof(pdata) + sizeof(struct gpio_led_data) count,
	GFP_KERNEL);
	if (!pdata)
	return -ENOMEM;

	for_each_child_of_node(np, child) {
	struct gpio_led led = {};
	enum of_gpio_flags flags;
	const char *state;

	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);
	state = of_get_property(child, "default-state", NULL);
	if (state) {
	if (!strcmp(state, "keep"))
	led.default_state = LEDS_GPIO_DEFSTATE_KEEP;
	else if(!strcmp(state, "on"))
	led.default_state = LEDS_GPIO_DEFSTATE_ON;
	else
	led.default_state = LEDS_GPIO_DEFSTATE_OFF;
	}

	ret = create_gpio_led(&led, &pdata->led_data[pdata->num_leds++],
	&ofdev->dev, NULL);
	if (ret < 0) {
	of_node_put(child);
	goto err;
	}
	}

	dev_set_drvdata(&ofdev->dev, pdata);

	return 0;

	err:
	for (count = pdata->num_leds - 2; count >= 0; count--)
	delete_gpio_led(&pdata->led_data[count]);

	kfree(pdata);

	return ret;
	}

	static int __devexit of_gpio_leds_remove(struct of_device *ofdev)
	{
	struct gpio_led_of_platform_data *pdata = dev_get_drvdata(&ofdev->dev);
	int i;

	for (i = 0; i < pdata->num_leds; i++)
	delete_gpio_led(&pdata->led_data[i]);

	kfree(pdata);

	dev_set_drvdata(&ofdev->dev, NULL);

	return 0;
	}

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

	static struct of_platform_driver of_gpio_leds_driver = {
	.driver = {
	.name = "of_gpio_leds",
	.owner = THIS_MODULE,
	.of_match_table = of_gpio_leds_match,
	},
	.probe = of_gpio_leds_probe,
	.remove = __devexit_p(of_gpio_leds_remove),
	};
	#endif

	static int __init gpio_led_init(void)
	{
	int ret;

	#ifdef CONFIG_LEDS_GPIO_PLATFORM
	ret = platform_driver_register(&gpio_led_driver);
	if (ret)
	return ret;
	#endif
	#ifdef CONFIG_LEDS_GPIO_OF
	ret = of_register_platform_driver(&of_gpio_leds_driver);
	#endif
	#ifdef CONFIG_LEDS_GPIO_PLATFORM
	if (ret)
	platform_driver_unregister(&gpio_led_driver);
	#endif

	return ret;
	}

	static void __exit gpio_led_exit(void)
	{
	#ifdef CONFIG_LEDS_GPIO_PLATFORM
	platform_driver_unregister(&gpio_led_driver);
	#endif
	#ifdef CONFIG_LEDS_GPIO_OF
	of_unregister_platform_driver(&of_gpio_leds_driver);
	#endif
	}

	module_init(gpio_led_init);
	module_exit(gpio_led_exit);

	MODULE_AUTHOR("Raphael Assenat <raph@8d.com>, Trent Piepho <tpiepho@freescale.com>");
	MODULE_DESCRIPTION("GPIO LED driver");
	MODULE_LICENSE("GPL");