[linux.git] / arch / sh / drivers / push-switch.c

/*
 * Generic push-switch framework
 *
 * Copyright (C) 2006  Paul Mundt
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 */
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <asm/push-switch.h>

#define DRV_NAME "push-switch"
#define DRV_VERSION "0.1.1"

static ssize_t switch_show(struct device *dev,
			   struct device_attribute *attr,
			   char *buf)
{
	struct push_switch_platform_info *psw_info = dev->platform_data;
	return sprintf(buf, "%s\n", psw_info->name);
}
static DEVICE_ATTR(switch, S_IRUGO, switch_show, NULL);

static void switch_timer(unsigned long data)
{
	struct push_switch *psw = (struct push_switch *)data;

	schedule_work(&psw->work);
}

static void switch_work_handler(struct work_struct *work)
{
	struct push_switch *psw = container_of(work, struct push_switch, work);
	struct platform_device *pdev = psw->pdev;

	psw->state = 0;

	kobject_uevent(&pdev->dev.kobj, KOBJ_CHANGE);
}

static int switch_drv_probe(struct platform_device *pdev)
{
	struct push_switch_platform_info *psw_info;
	struct push_switch *psw;
	int ret, irq;

	psw = kzalloc(sizeof(struct push_switch), GFP_KERNEL);
	if (unlikely(!psw))
		return -ENOMEM;

	irq = platform_get_irq(pdev, 0);
	if (unlikely(irq < 0)) {
		ret = -ENODEV;
		goto err;
	}

	psw_info = pdev->dev.platform_data;
	BUG_ON(!psw_info);

	ret = request_irq(irq, psw_info->irq_handler,
			  psw_info->irq_flags,
			  psw_info->name ? psw_info->name : DRV_NAME, pdev);
	if (unlikely(ret < 0))
		goto err;

	if (psw_info->name) {
		ret = device_create_file(&pdev->dev, &dev_attr_switch);
		if (unlikely(ret)) {
			dev_err(&pdev->dev, "Failed creating device attrs\n");
			ret = -EINVAL;
			goto err_irq;
		}
	}

	INIT_WORK(&psw->work, switch_work_handler);
	init_timer(&psw->debounce);

	psw->debounce.function = switch_timer;
	psw->debounce.data = (unsigned long)psw;

	/* Workqueue API brain-damage */
	psw->pdev = pdev;

	platform_set_drvdata(pdev, psw);

	return 0;

err_irq:
	free_irq(irq, pdev);
err:
	kfree(psw);
	return ret;
}

static int switch_drv_remove(struct platform_device *pdev)
{
	struct push_switch *psw = platform_get_drvdata(pdev);
	struct push_switch_platform_info *psw_info = pdev->dev.platform_data;
	int irq = platform_get_irq(pdev, 0);

	if (psw_info->name)
		device_remove_file(&pdev->dev, &dev_attr_switch);

	platform_set_drvdata(pdev, NULL);
	flush_work_sync(&psw->work);
	del_timer_sync(&psw->debounce);
	free_irq(irq, pdev);

	kfree(psw);

	return 0;
}

static struct platform_driver switch_driver = {
	.probe		= switch_drv_probe,
	.remove		= switch_drv_remove,
	.driver		= {
		.name	= DRV_NAME,
	},
};

static int __init switch_init(void)
{
	printk(KERN_NOTICE DRV_NAME ": version %s loaded\n", DRV_VERSION);
	return platform_driver_register(&switch_driver);
}

static void __exit switch_exit(void)
{
	platform_driver_unregister(&switch_driver);
}
module_init(switch_init);
module_exit(switch_exit);

MODULE_VERSION(DRV_VERSION);
MODULE_AUTHOR("Paul Mundt");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
9f5e8eee PM	1	/*
	2	* Generic push-switch framework
	3	*
	4	* Copyright (C) 2006 Paul Mundt
	5	*
	6	* This file is subject to the terms and conditions of the GNU General Public
	7	* License. See the file "COPYING" in the main directory of this archive
	8	* for more details.
	9	*/
	10	#include <linux/init.h>
5a0e3ad6	11	#include <linux/slab.h>
9f5e8eee PM	12	#include <linux/module.h>
	13	#include <linux/interrupt.h>
	14	#include <linux/platform_device.h>
	15	#include <asm/push-switch.h>
	16
	17	#define DRV_NAME "push-switch"
fce3a24e	18	#define DRV_VERSION "0.1.1"
9f5e8eee PM	19
	20	static ssize_t switch_show(struct device *dev,
	21	struct device_attribute *attr,
	22	char *buf)
	23	{
	24	struct push_switch_platform_info *psw_info = dev->platform_data;
	25	return sprintf(buf, "%s\n", psw_info->name);
	26	}
	27	static DEVICE_ATTR(switch, S_IRUGO, switch_show, NULL);
	28
	29	static void switch_timer(unsigned long data)
	30	{
	31	struct push_switch psw = (struct push_switch )data;
	32
	33	schedule_work(&psw->work);
	34	}
	35
fce3a24e	36	static void switch_work_handler(struct work_struct *work)
9f5e8eee	37	{
fce3a24e PM	38	struct push_switch *psw = container_of(work, struct push_switch, work);
fce3a24e PM	39	struct platform_device *pdev = psw->pdev;
9f5e8eee PM	40
	41	psw->state = 0;
	42
	43	kobject_uevent(&pdev->dev.kobj, KOBJ_CHANGE);
	44	}
	45
	46	static int switch_drv_probe(struct platform_device *pdev)
	47	{
	48	struct push_switch_platform_info *psw_info;
	49	struct push_switch *psw;
	50	int ret, irq;
	51
	52	psw = kzalloc(sizeof(struct push_switch), GFP_KERNEL);
	53	if (unlikely(!psw))
	54	return -ENOMEM;
	55
	56	irq = platform_get_irq(pdev, 0);
	57	if (unlikely(irq < 0)) {
	58	ret = -ENODEV;
	59	goto err;
	60	}
	61
	62	psw_info = pdev->dev.platform_data;
	63	BUG_ON(!psw_info);
	64
	65	ret = request_irq(irq, psw_info->irq_handler,
d11584a0	66	psw_info->irq_flags,
9f5e8eee PM	67	psw_info->name ? psw_info->name : DRV_NAME, pdev);
	68	if (unlikely(ret < 0))
	69	goto err;
	70
	71	if (psw_info->name) {
	72	ret = device_create_file(&pdev->dev, &dev_attr_switch);
	73	if (unlikely(ret)) {
	74	dev_err(&pdev->dev, "Failed creating device attrs\n");
	75	ret = -EINVAL;
	76	goto err_irq;
	77	}
	78	}
	79
fce3a24e	80	INIT_WORK(&psw->work, switch_work_handler);
9f5e8eee PM	81	init_timer(&psw->debounce);
	82
	83	psw->debounce.function = switch_timer;
	84	psw->debounce.data = (unsigned long)psw;
	85
fce3a24e PM	86	/* Workqueue API brain-damage */
	87	psw->pdev = pdev;
	88
9f5e8eee PM	89	platform_set_drvdata(pdev, psw);
	90
	91	return 0;
	92
	93	err_irq:
	94	free_irq(irq, pdev);
	95	err:
	96	kfree(psw);
	97	return ret;
	98	}
	99
	100	static int switch_drv_remove(struct platform_device *pdev)
	101	{
	102	struct push_switch *psw = platform_get_drvdata(pdev);
	103	struct push_switch_platform_info *psw_info = pdev->dev.platform_data;
	104	int irq = platform_get_irq(pdev, 0);
	105
	106	if (psw_info->name)
	107	device_remove_file(&pdev->dev, &dev_attr_switch);
	108
	109	platform_set_drvdata(pdev, NULL);
539253f6	110	flush_work_sync(&psw->work);
9f5e8eee PM	111	del_timer_sync(&psw->debounce);
	112	free_irq(irq, pdev);
	113
	114	kfree(psw);
	115
	116	return 0;
	117	}
	118
	119	static struct platform_driver switch_driver = {
	120	.probe = switch_drv_probe,
	121	.remove = switch_drv_remove,
	122	.driver = {
	123	.name = DRV_NAME,
	124	},
	125	};
	126
	127	static int __init switch_init(void)
	128	{
	129	printk(KERN_NOTICE DRV_NAME ": version %s loaded\n", DRV_VERSION);
	130	return platform_driver_register(&switch_driver);
	131	}
	132
	133	static void __exit switch_exit(void)
	134	{
	135	platform_driver_unregister(&switch_driver);
	136	}
	137	module_init(switch_init);
	138	module_exit(switch_exit);
	139
	140	MODULE_VERSION(DRV_VERSION);
	141	MODULE_AUTHOR("Paul Mundt");
e5e3dfc8	142	MODULE_LICENSE("GPL v2");