[linux-2.6-block.git] / drivers / leds / leds-gpio.c

/*
 * 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;
	int (*platform_gpio_blink_set)(unsigned gpio,
			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);

	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
		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);

	return led_dat->platform_gpio_blink_set(led_dat->gpio, 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, 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;
	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->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,
	},
	.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");
Commit	Line	Data
22e03f3b RA	1	/*
	2	* LEDs driver for GPIOs
	3	*
	4	* Copyright (C) 2007 8D Technologies inc.
	5	* Raphael Assenat <raph@8d.com>
a7d878af	6	* Copyright (C) 2008 Freescale Semiconductor, Inc.
22e03f3b RA	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*
	12	*/
	13	#include <linux/kernel.h>
	14	#include <linux/init.h>
	15	#include <linux/platform_device.h>
	16	#include <linux/leds.h>
5a0e3ad6	17	#include <linux/slab.h>
00852279 DB	18	#include <linux/workqueue.h>
00852279 DB	19
22e03f3b RA	20	#include <asm/gpio.h>
	21
	22	struct gpio_led_data {
	23	struct led_classdev cdev;
	24	unsigned gpio;
00852279 DB	25	struct work_struct work;
	26	u8 new_level;
	27	u8 can_sleep;
22e03f3b	28	u8 active_low;
ca3259b3 HVR	29	int (*platform_gpio_blink_set)(unsigned gpio,
ca3259b3 HVR	30	unsigned long delay_on, unsigned long delay_off);
22e03f3b RA	31	};
22e03f3b RA	32
00852279 DB	33	static void gpio_led_work(struct work_struct *work)
	34	{
	35	struct gpio_led_data *led_dat =
	36	container_of(work, struct gpio_led_data, work);
	37
	38	gpio_set_value_cansleep(led_dat->gpio, led_dat->new_level);
	39	}
22e03f3b RA	40
	41	static void gpio_led_set(struct led_classdev *led_cdev,
	42	enum led_brightness value)
	43	{
	44	struct gpio_led_data *led_dat =
	45	container_of(led_cdev, struct gpio_led_data, cdev);
	46	int level;
	47
	48	if (value == LED_OFF)
	49	level = 0;
	50	else
	51	level = 1;
	52
	53	if (led_dat->active_low)
	54	level = !level;
	55
306dd85c DB	56	/* Setting GPIOs with I2C/etc requires a task context, and we don't
	57	* seem to have a reliable way to know if we're already in one; so
	58	* let's just assume the worst.
	59	*/
00852279	60	if (led_dat->can_sleep) {
306dd85c DB	61	led_dat->new_level = level;
306dd85c DB	62	schedule_work(&led_dat->work);
00852279 DB	63	} else
00852279 DB	64	gpio_set_value(led_dat->gpio, level);
22e03f3b RA	65	}
22e03f3b RA	66
ca3259b3 HVR	67	static int gpio_blink_set(struct led_classdev *led_cdev,
	68	unsigned long delay_on, unsigned long delay_off)
	69	{
	70	struct gpio_led_data *led_dat =
	71	container_of(led_cdev, struct gpio_led_data, cdev);
	72
	73	return led_dat->platform_gpio_blink_set(led_dat->gpio, delay_on, delay_off);
	74	}
	75
a7d878af TP	76	static int __devinit create_gpio_led(const struct gpio_led *template,
	77	struct gpio_led_data led_dat, struct device parent,
	78	int (blink_set)(unsigned, unsigned long , unsigned long *))
	79	{
ed88bae6	80	int ret, state;
a7d878af	81
0b4634fc DES	82	led_dat->gpio = -1;
0b4634fc DES	83
d379ee8a DB	84	/* skip leds that aren't available */
d379ee8a DB	85	if (!gpio_is_valid(template->gpio)) {
2fea0922	86	printk(KERN_INFO "Skipping unavailable LED gpio %d (%s)\n",
d379ee8a	87	template->gpio, template->name);
ac15e950	88	return 0;
d379ee8a DB	89	}
d379ee8a DB	90
a7d878af TP	91	ret = gpio_request(template->gpio, template->name);
	92	if (ret < 0)
	93	return ret;
	94
	95	led_dat->cdev.name = template->name;
	96	led_dat->cdev.default_trigger = template->default_trigger;
	97	led_dat->gpio = template->gpio;
	98	led_dat->can_sleep = gpio_cansleep(template->gpio);
	99	led_dat->active_low = template->active_low;
	100	if (blink_set) {
	101	led_dat->platform_gpio_blink_set = blink_set;
	102	led_dat->cdev.blink_set = gpio_blink_set;
	103	}
	104	led_dat->cdev.brightness_set = gpio_led_set;
ed88bae6 TP	105	if (template->default_state == LEDS_GPIO_DEFSTATE_KEEP)
	106	state = !!gpio_get_value(led_dat->gpio) ^ led_dat->active_low;
	107	else
	108	state = (template->default_state == LEDS_GPIO_DEFSTATE_ON);
	109	led_dat->cdev.brightness = state ? LED_FULL : LED_OFF;
defb512d RP	110	if (!template->retain_state_suspended)
defb512d RP	111	led_dat->cdev.flags \|= LED_CORE_SUSPENDRESUME;
a7d878af	112
ed88bae6	113	ret = gpio_direction_output(led_dat->gpio, led_dat->active_low ^ state);
a7d878af TP	114	if (ret < 0)
	115	goto err;
	116
	117	INIT_WORK(&led_dat->work, gpio_led_work);
	118
	119	ret = led_classdev_register(parent, &led_dat->cdev);
	120	if (ret < 0)
	121	goto err;
	122
	123	return 0;
	124	err:
	125	gpio_free(led_dat->gpio);
	126	return ret;
	127	}
	128
	129	static void delete_gpio_led(struct gpio_led_data *led)
	130	{
d379ee8a DB	131	if (!gpio_is_valid(led->gpio))
d379ee8a DB	132	return;
a7d878af TP	133	led_classdev_unregister(&led->cdev);
	134	cancel_work_sync(&led->work);
	135	gpio_free(led->gpio);
	136	}
	137
	138	#ifdef CONFIG_LEDS_GPIO_PLATFORM
7fd02170	139	static int __devinit gpio_led_probe(struct platform_device *pdev)
22e03f3b RA	140	{
22e03f3b RA	141	struct gpio_led_platform_data *pdata = pdev->dev.platform_data;
a7d878af	142	struct gpio_led_data *leds_data;
22e03f3b RA	143	int i, ret = 0;
	144
	145	if (!pdata)
	146	return -EBUSY;
	147
	148	leds_data = kzalloc(sizeof(struct gpio_led_data) * pdata->num_leds,
	149	GFP_KERNEL);
	150	if (!leds_data)
	151	return -ENOMEM;
	152
	153	for (i = 0; i < pdata->num_leds; i++) {
a7d878af TP	154	ret = create_gpio_led(&pdata->leds[i], &leds_data[i],
a7d878af TP	155	&pdev->dev, pdata->gpio_blink_set);
d95cbe61 UKK	156	if (ret < 0)
d95cbe61 UKK	157	goto err;
22e03f3b RA	158	}
	159
	160	platform_set_drvdata(pdev, leds_data);
	161
	162	return 0;
	163
	164	err:
a7d878af TP	165	for (i = i - 1; i >= 0; i--)
a7d878af TP	166	delete_gpio_led(&leds_data[i]);
00852279	167
22e03f3b RA	168	kfree(leds_data);
	169
	170	return ret;
	171	}
	172
199fb21d	173	static int __devexit gpio_led_remove(struct platform_device *pdev)
22e03f3b RA	174	{
	175	int i;
	176	struct gpio_led_platform_data *pdata = pdev->dev.platform_data;
	177	struct gpio_led_data *leds_data;
	178
	179	leds_data = platform_get_drvdata(pdev);
	180
a7d878af TP	181	for (i = 0; i < pdata->num_leds; i++)
a7d878af TP	182	delete_gpio_led(&leds_data[i]);
199fb21d	183
22e03f3b RA	184	kfree(leds_data);
	185
	186	return 0;
	187	}
	188
22e03f3b	189	static struct platform_driver gpio_led_driver = {
199fb21d DB	190	.probe = gpio_led_probe,
199fb21d DB	191	.remove = __devexit_p(gpio_led_remove),
22e03f3b RA	192	.driver = {
	193	.name = "leds-gpio",
	194	.owner = THIS_MODULE,
	195	},
	196	};
	197
a7d878af TP	198	MODULE_ALIAS("platform:leds-gpio");
	199	#endif /* CONFIG_LEDS_GPIO_PLATFORM */
	200
	201	/* Code to create from OpenFirmware platform devices */
	202	#ifdef CONFIG_LEDS_GPIO_OF
	203	#include <linux/of_platform.h>
	204	#include <linux/of_gpio.h>
	205
	206	struct gpio_led_of_platform_data {
	207	int num_leds;
	208	struct gpio_led_data led_data[];
	209	};
	210
	211	static int __devinit of_gpio_leds_probe(struct of_device *ofdev,
	212	const struct of_device_id *match)
	213	{
	214	struct device_node np = ofdev->node, child;
a7d878af TP	215	struct gpio_led_of_platform_data *pdata;
	216	int count = 0, ret;
	217
	218	/* count LEDs defined by this device, so we know how much to allocate */
	219	for_each_child_of_node(np, child)
	220	count++;
	221	if (!count)
	222	return 0; /* or ENODEV? */
	223
	224	pdata = kzalloc(sizeof(pdata) + sizeof(struct gpio_led_data) count,
	225	GFP_KERNEL);
	226	if (!pdata)
	227	return -ENOMEM;
	228
a7d878af	229	for_each_child_of_node(np, child) {
0493a4ff	230	struct gpio_led led = {};
a7d878af	231	enum of_gpio_flags flags;
ed88bae6	232	const char *state;
a7d878af TP	233
	234	led.gpio = of_get_gpio_flags(child, 0, &flags);
	235	led.active_low = flags & OF_GPIO_ACTIVE_LOW;
	236	led.name = of_get_property(child, "label", NULL) ? : child->name;
	237	led.default_trigger =
	238	of_get_property(child, "linux,default-trigger", NULL);
ed88bae6 TP	239	state = of_get_property(child, "default-state", NULL);
	240	if (state) {
	241	if (!strcmp(state, "keep"))
	242	led.default_state = LEDS_GPIO_DEFSTATE_KEEP;
	243	else if(!strcmp(state, "on"))
	244	led.default_state = LEDS_GPIO_DEFSTATE_ON;
	245	else
	246	led.default_state = LEDS_GPIO_DEFSTATE_OFF;
	247	}
a7d878af TP	248
	249	ret = create_gpio_led(&led, &pdata->led_data[pdata->num_leds++],
	250	&ofdev->dev, NULL);
	251	if (ret < 0) {
	252	of_node_put(child);
	253	goto err;
	254	}
	255	}
	256
	257	dev_set_drvdata(&ofdev->dev, pdata);
	258
	259	return 0;
	260
	261	err:
	262	for (count = pdata->num_leds - 2; count >= 0; count--)
	263	delete_gpio_led(&pdata->led_data[count]);
	264
	265	kfree(pdata);
	266
	267	return ret;
	268	}
	269
	270	static int __devexit of_gpio_leds_remove(struct of_device *ofdev)
	271	{
	272	struct gpio_led_of_platform_data *pdata = dev_get_drvdata(&ofdev->dev);
	273	int i;
	274
	275	for (i = 0; i < pdata->num_leds; i++)
	276	delete_gpio_led(&pdata->led_data[i]);
	277
	278	kfree(pdata);
	279
	280	dev_set_drvdata(&ofdev->dev, NULL);
	281
	282	return 0;
	283	}
	284
	285	static const struct of_device_id of_gpio_leds_match[] = {
	286	{ .compatible = "gpio-leds", },
	287	{},
	288	};
	289
	290	static struct of_platform_driver of_gpio_leds_driver = {
	291	.driver = {
	292	.name = "of_gpio_leds",
	293	.owner = THIS_MODULE,
	294	},
	295	.match_table = of_gpio_leds_match,
	296	.probe = of_gpio_leds_probe,
	297	.remove = __devexit_p(of_gpio_leds_remove),
	298	};
b2bdc3e7	299	#endif
a7d878af	300
b2bdc3e7	301	static int __init gpio_led_init(void)
a7d878af	302	{
b2bdc3e7 RP	303	int ret;
	304
	305	#ifdef CONFIG_LEDS_GPIO_PLATFORM
	306	ret = platform_driver_register(&gpio_led_driver);
	307	if (ret)
	308	return ret;
	309	#endif
	310	#ifdef CONFIG_LEDS_GPIO_OF
	311	ret = of_register_platform_driver(&of_gpio_leds_driver);
	312	#endif
	313	#ifdef CONFIG_LEDS_GPIO_PLATFORM
	314	if (ret)
	315	platform_driver_unregister(&gpio_led_driver);
	316	#endif
	317
	318	return ret;
a7d878af	319	}
a7d878af	320
b2bdc3e7	321	static void __exit gpio_led_exit(void)
a7d878af	322	{
b2bdc3e7 RP	323	#ifdef CONFIG_LEDS_GPIO_PLATFORM
	324	platform_driver_unregister(&gpio_led_driver);
	325	#endif
	326	#ifdef CONFIG_LEDS_GPIO_OF
a7d878af	327	of_unregister_platform_driver(&of_gpio_leds_driver);
a7d878af	328	#endif
b2bdc3e7 RP	329	}
	330
	331	module_init(gpio_led_init);
	332	module_exit(gpio_led_exit);
a7d878af TP	333
a7d878af TP	334	MODULE_AUTHOR("Raphael Assenat <raph@8d.com>, Trent Piepho <tpiepho@freescale.com>");
22e03f3b RA	335	MODULE_DESCRIPTION("GPIO LED driver");
22e03f3b RA	336	MODULE_LICENSE("GPL");