143 lines
3.1 KiB
C
143 lines
3.1 KiB
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,
|
|
IRQF_DISABLED | 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");
|