blob: 2813140fd92bb2dcdcc1136739818565081d41d5 [file] [log] [blame]
Kuninori Morimotoff4a7482018-12-28 00:31:49 -08001// SPDX-License-Identifier: GPL-2.0
Paul Mundt9f5e8ee2006-11-24 11:22:57 +09002/*
3 * Generic push-switch framework
4 *
5 * Copyright (C) 2006 Paul Mundt
Paul Mundt9f5e8ee2006-11-24 11:22:57 +09006 */
7#include <linux/init.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +09008#include <linux/slab.h>
Paul Mundt9f5e8ee2006-11-24 11:22:57 +09009#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"
Paul Mundtfce3a242006-12-07 13:20:58 +090015#define DRV_VERSION "0.1.1"
Paul Mundt9f5e8ee2006-11-24 11:22:57 +090016
17static 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}
Joe Perchesc828a892017-12-19 10:15:08 -080024static DEVICE_ATTR_RO(switch);
Paul Mundt9f5e8ee2006-11-24 11:22:57 +090025
Kees Cooke99e88a2017-10-16 14:43:17 -070026static void switch_timer(struct timer_list *t)
Paul Mundt9f5e8ee2006-11-24 11:22:57 +090027{
Kees Cooke99e88a2017-10-16 14:43:17 -070028 struct push_switch *psw = from_timer(psw, t, debounce);
Paul Mundt9f5e8ee2006-11-24 11:22:57 +090029
30 schedule_work(&psw->work);
31}
32
Paul Mundtfce3a242006-12-07 13:20:58 +090033static void switch_work_handler(struct work_struct *work)
Paul Mundt9f5e8ee2006-11-24 11:22:57 +090034{
Paul Mundtfce3a242006-12-07 13:20:58 +090035 struct push_switch *psw = container_of(work, struct push_switch, work);
36 struct platform_device *pdev = psw->pdev;
Paul Mundt9f5e8ee2006-11-24 11:22:57 +090037
38 psw->state = 0;
39
40 kobject_uevent(&pdev->dev.kobj, KOBJ_CHANGE);
41}
42
43static 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,
Yong Zhangd11584a2011-10-22 17:56:28 +080063 psw_info->irq_flags,
Paul Mundt9f5e8ee2006-11-24 11:22:57 +090064 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
Paul Mundtfce3a242006-12-07 13:20:58 +090077 INIT_WORK(&psw->work, switch_work_handler);
Kees Cooke99e88a2017-10-16 14:43:17 -070078 timer_setup(&psw->debounce, switch_timer, 0);
Paul Mundt9f5e8ee2006-11-24 11:22:57 +090079
Paul Mundtfce3a242006-12-07 13:20:58 +090080 /* Workqueue API brain-damage */
81 psw->pdev = pdev;
82
Paul Mundt9f5e8ee2006-11-24 11:22:57 +090083 platform_set_drvdata(pdev, psw);
84
85 return 0;
86
87err_irq:
88 free_irq(irq, pdev);
89err:
90 kfree(psw);
91 return ret;
92}
93
94static int switch_drv_remove(struct platform_device *pdev)
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);
Tejun Heo43829732012-08-20 14:51:24 -0700104 flush_work(&psw->work);
Paul Mundt9f5e8ee2006-11-24 11:22:57 +0900105 del_timer_sync(&psw->debounce);
106 free_irq(irq, pdev);
107
108 kfree(psw);
109
110 return 0;
111}
112
113static struct platform_driver switch_driver = {
114 .probe = switch_drv_probe,
115 .remove = switch_drv_remove,
116 .driver = {
117 .name = DRV_NAME,
118 },
119};
120
121static int __init switch_init(void)
122{
123 printk(KERN_NOTICE DRV_NAME ": version %s loaded\n", DRV_VERSION);
124 return platform_driver_register(&switch_driver);
125}
126
127static void __exit switch_exit(void)
128{
129 platform_driver_unregister(&switch_driver);
130}
131module_init(switch_init);
132module_exit(switch_exit);
133
134MODULE_VERSION(DRV_VERSION);
135MODULE_AUTHOR("Paul Mundt");
Paul Mundte5e3dfc2007-07-18 18:54:09 +0900136MODULE_LICENSE("GPL v2");