Merge tag 'sh-for-linus' of git://github.com/pmundt/linux-sh
[linux-2.6.git] / arch / sh / drivers / push-switch.c
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>
11 #include <linux/slab.h>
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"
18 #define DRV_VERSION "0.1.1"
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
36 static void switch_work_handler(struct work_struct *work)
37 {
38         struct push_switch *psw = container_of(work, struct push_switch, work);
39         struct platform_device *pdev = psw->pdev;
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,
66                           psw_info->irq_flags,
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
80         INIT_WORK(&psw->work, switch_work_handler);
81         init_timer(&psw->debounce);
82
83         psw->debounce.function = switch_timer;
84         psw->debounce.data = (unsigned long)psw;
85
86         /* Workqueue API brain-damage */
87         psw->pdev = pdev;
88
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);
110         flush_work_sync(&psw->work);
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");
142 MODULE_LICENSE("GPL v2");