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Linux/arch/sh/drivers/push-switch.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * Generic push-switch framework
  4  *
  5  * Copyright (C) 2006  Paul Mundt
  6  */
  7 #include <linux/init.h>
  8 #include <linux/slab.h>
  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"
 15 #define DRV_VERSION "0.1.1"
 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 }
 24 static DEVICE_ATTR_RO(switch);
 25 
 26 static void switch_timer(struct timer_list *t)
 27 {
 28         struct push_switch *psw = from_timer(psw, t, debounce);
 29 
 30         schedule_work(&psw->work);
 31 }
 32 
 33 static void switch_work_handler(struct work_struct *work)
 34 {
 35         struct push_switch *psw = container_of(work, struct push_switch, work);
 36         struct platform_device *pdev = psw->pdev;
 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,
 63                           psw_info->irq_flags,
 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 
 77         INIT_WORK(&psw->work, switch_work_handler);
 78         timer_setup(&psw->debounce, switch_timer, 0);
 79 
 80         /* Workqueue API brain-damage */
 81         psw->pdev = pdev;
 82 
 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 
 94 static 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);
104         flush_work(&psw->work);
105         del_timer_sync(&psw->debounce);
106         free_irq(irq, pdev);
107 
108         kfree(psw);
109 
110         return 0;
111 }
112 
113 static struct platform_driver switch_driver = {
114         .probe          = switch_drv_probe,
115         .remove         = switch_drv_remove,
116         .driver         = {
117                 .name   = DRV_NAME,
118         },
119 };
120 
121 static 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 
127 static void __exit switch_exit(void)
128 {
129         platform_driver_unregister(&switch_driver);
130 }
131 module_init(switch_init);
132 module_exit(switch_exit);
133 
134 MODULE_VERSION(DRV_VERSION);
135 MODULE_AUTHOR("Paul Mundt");
136 MODULE_LICENSE("GPL v2");
137 

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