e5e3dfc80a
This was accidentally set as "GPLv2", whereas the kernel expects v2 to be written "GPL v2", this caused complaints regarding the use of the platform device APIs when built as a module. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
141 lines
3.1 KiB
C
141 lines
3.1 KiB
C
/*
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* Generic push-switch framework
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*
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* Copyright (C) 2006 Paul Mundt
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <asm/push-switch.h>
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#define DRV_NAME "push-switch"
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#define DRV_VERSION "0.1.1"
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static ssize_t switch_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct push_switch_platform_info *psw_info = dev->platform_data;
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return sprintf(buf, "%s\n", psw_info->name);
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}
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static DEVICE_ATTR(switch, S_IRUGO, switch_show, NULL);
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static void switch_timer(unsigned long data)
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{
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struct push_switch *psw = (struct push_switch *)data;
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schedule_work(&psw->work);
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}
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static void switch_work_handler(struct work_struct *work)
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{
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struct push_switch *psw = container_of(work, struct push_switch, work);
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struct platform_device *pdev = psw->pdev;
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psw->state = 0;
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kobject_uevent(&pdev->dev.kobj, KOBJ_CHANGE);
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}
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static int switch_drv_probe(struct platform_device *pdev)
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{
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struct push_switch_platform_info *psw_info;
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struct push_switch *psw;
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int ret, irq;
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psw = kzalloc(sizeof(struct push_switch), GFP_KERNEL);
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if (unlikely(!psw))
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return -ENOMEM;
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irq = platform_get_irq(pdev, 0);
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if (unlikely(irq < 0)) {
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ret = -ENODEV;
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goto err;
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}
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psw_info = pdev->dev.platform_data;
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BUG_ON(!psw_info);
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ret = request_irq(irq, psw_info->irq_handler,
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IRQF_DISABLED | psw_info->irq_flags,
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psw_info->name ? psw_info->name : DRV_NAME, pdev);
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if (unlikely(ret < 0))
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goto err;
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if (psw_info->name) {
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ret = device_create_file(&pdev->dev, &dev_attr_switch);
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if (unlikely(ret)) {
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dev_err(&pdev->dev, "Failed creating device attrs\n");
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ret = -EINVAL;
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goto err_irq;
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}
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}
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INIT_WORK(&psw->work, switch_work_handler);
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init_timer(&psw->debounce);
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psw->debounce.function = switch_timer;
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psw->debounce.data = (unsigned long)psw;
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/* Workqueue API brain-damage */
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psw->pdev = pdev;
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platform_set_drvdata(pdev, psw);
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return 0;
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err_irq:
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free_irq(irq, pdev);
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err:
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kfree(psw);
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return ret;
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}
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static int switch_drv_remove(struct platform_device *pdev)
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{
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struct push_switch *psw = platform_get_drvdata(pdev);
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struct push_switch_platform_info *psw_info = pdev->dev.platform_data;
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int irq = platform_get_irq(pdev, 0);
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if (psw_info->name)
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device_remove_file(&pdev->dev, &dev_attr_switch);
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platform_set_drvdata(pdev, NULL);
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flush_scheduled_work();
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del_timer_sync(&psw->debounce);
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free_irq(irq, pdev);
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kfree(psw);
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return 0;
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}
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static struct platform_driver switch_driver = {
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.probe = switch_drv_probe,
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.remove = switch_drv_remove,
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.driver = {
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.name = DRV_NAME,
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},
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};
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static int __init switch_init(void)
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{
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printk(KERN_NOTICE DRV_NAME ": version %s loaded\n", DRV_VERSION);
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return platform_driver_register(&switch_driver);
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}
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static void __exit switch_exit(void)
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{
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platform_driver_unregister(&switch_driver);
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}
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module_init(switch_init);
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module_exit(switch_exit);
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MODULE_VERSION(DRV_VERSION);
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MODULE_AUTHOR("Paul Mundt");
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MODULE_LICENSE("GPL v2");
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