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

// SPDX-License-Identifier: GPL-2.0
/*
 * Generic push-switch framework
 *
 * Copyright (C) 2006  Paul Mundt
 */
#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_RO(switch);

static void switch_timer(struct timer_list *t)
{
	struct push_switch *psw = from_timer(psw, t, debounce);

	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);
	timer_setup(&psw->debounce, switch_timer, 0);

	/* 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 void 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);
	timer_shutdown_sync(&psw->debounce);
	flush_work(&psw->work);
	free_irq(irq, pdev);

	kfree(psw);
}

static struct platform_driver switch_driver = {
	.probe		= switch_drv_probe,
	.remove_new	= 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
ff4a7481	1	// SPDX-License-Identifier: GPL-2.0
9f5e8eee PM	2	/*
	3	* Generic push-switch framework
	4	*
	5	* Copyright (C) 2006 Paul Mundt
9f5e8eee PM	6	*/
9f5e8eee PM	7	#include <linux/init.h>
5a0e3ad6	8	#include <linux/slab.h>
9f5e8eee PM	9	#include <linux/module.h>
	10	#include <linux/interrupt.h>
	11	#include <linux/platform_device.h>
	12	#include <asm/push-switch.h>
	13
	14	#define DRV_NAME "push-switch"
fce3a24e	15	#define DRV_VERSION "0.1.1"
9f5e8eee PM	16
	17	static ssize_t switch_show(struct device *dev,
	18	struct device_attribute *attr,
	19	char *buf)
	20	{
	21	struct push_switch_platform_info *psw_info = dev->platform_data;
	22	return sprintf(buf, "%s\n", psw_info->name);
	23	}
c828a892	24	static DEVICE_ATTR_RO(switch);
9f5e8eee	25
e99e88a9	26	static void switch_timer(struct timer_list *t)
9f5e8eee	27	{
e99e88a9	28	struct push_switch *psw = from_timer(psw, t, debounce);
9f5e8eee PM	29
	30	schedule_work(&psw->work);
	31	}
	32
fce3a24e	33	static void switch_work_handler(struct work_struct *work)
9f5e8eee	34	{
fce3a24e PM	35	struct push_switch *psw = container_of(work, struct push_switch, work);
fce3a24e PM	36	struct platform_device *pdev = psw->pdev;
9f5e8eee PM	37
	38	psw->state = 0;
	39
	40	kobject_uevent(&pdev->dev.kobj, KOBJ_CHANGE);
	41	}
	42
	43	static int switch_drv_probe(struct platform_device *pdev)
	44	{
	45	struct push_switch_platform_info *psw_info;
	46	struct push_switch *psw;
	47	int ret, irq;
	48
	49	psw = kzalloc(sizeof(struct push_switch), GFP_KERNEL);
	50	if (unlikely(!psw))
	51	return -ENOMEM;
	52
	53	irq = platform_get_irq(pdev, 0);
	54	if (unlikely(irq < 0)) {
	55	ret = -ENODEV;
	56	goto err;
	57	}
	58
	59	psw_info = pdev->dev.platform_data;
	60	BUG_ON(!psw_info);
	61
	62	ret = request_irq(irq, psw_info->irq_handler,
d11584a0	63	psw_info->irq_flags,
9f5e8eee PM	64	psw_info->name ? psw_info->name : DRV_NAME, pdev);
	65	if (unlikely(ret < 0))
	66	goto err;
	67
	68	if (psw_info->name) {
	69	ret = device_create_file(&pdev->dev, &dev_attr_switch);
	70	if (unlikely(ret)) {
	71	dev_err(&pdev->dev, "Failed creating device attrs\n");
	72	ret = -EINVAL;
	73	goto err_irq;
	74	}
	75	}
	76
fce3a24e	77	INIT_WORK(&psw->work, switch_work_handler);
e99e88a9	78	timer_setup(&psw->debounce, switch_timer, 0);
9f5e8eee	79
fce3a24e PM	80	/* Workqueue API brain-damage */
	81	psw->pdev = pdev;
	82
9f5e8eee PM	83	platform_set_drvdata(pdev, psw);
	84
	85	return 0;
	86
	87	err_irq:
	88	free_irq(irq, pdev);
	89	err:
	90	kfree(psw);
	91	return ret;
	92	}
	93
5019cd61	94	static void switch_drv_remove(struct platform_device *pdev)
9f5e8eee PM	95	{
	96	struct push_switch *psw = platform_get_drvdata(pdev);
	97	struct push_switch_platform_info *psw_info = pdev->dev.platform_data;
	98	int irq = platform_get_irq(pdev, 0);
	99
	100	if (psw_info->name)
	101	device_remove_file(&pdev->dev, &dev_attr_switch);
	102
	103	platform_set_drvdata(pdev, NULL);
292a089d	104	timer_shutdown_sync(&psw->debounce);
246f80a0	105	flush_work(&psw->work);
9f5e8eee PM	106	free_irq(irq, pdev);
	107
	108	kfree(psw);
9f5e8eee PM	109	}
	110
	111	static struct platform_driver switch_driver = {
	112	.probe = switch_drv_probe,
5019cd61	113	.remove_new = switch_drv_remove,
9f5e8eee PM	114	.driver = {
	115	.name = DRV_NAME,
	116	},
	117	};
	118
	119	static int __init switch_init(void)
	120	{
	121	printk(KERN_NOTICE DRV_NAME ": version %s loaded\n", DRV_VERSION);
	122	return platform_driver_register(&switch_driver);
	123	}
	124
	125	static void __exit switch_exit(void)
	126	{
	127	platform_driver_unregister(&switch_driver);
	128	}
	129	module_init(switch_init);
	130	module_exit(switch_exit);
	131
	132	MODULE_VERSION(DRV_VERSION);
	133	MODULE_AUTHOR("Paul Mundt");
e5e3dfc8	134	MODULE_LICENSE("GPL v2");