This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / arch / sh / drivers / push-switch.c

diff --git a/arch/sh/drivers/push-switch.c b/arch/sh/drivers/push-switch.c
new file mode 100644 (file)
index 0000000..b3d20c0
--- /dev/null
+++ b/arch/sh/drivers/push-switch.c
@@ -0,0 +1,141 @@
+/*
+ * Generic push-switch framework
+ *
+ * Copyright (C) 2006  Paul Mundt
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/init.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(switch, S_IRUGO, switch_show, NULL);
+
+static void switch_timer(unsigned long data)
+{
+       struct push_switch *psw = (struct push_switch *)data;
+
+       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,
+                         IRQF_DISABLED | 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);
+       init_timer(&psw->debounce);
+
+       psw->debounce.function = switch_timer;
+       psw->debounce.data = (unsigned long)psw;
+
+       /* 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 int 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);
+       flush_scheduled_work();
+       del_timer_sync(&psw->debounce);
+       free_irq(irq, pdev);
+
+       kfree(psw);
+
+       return 0;
+}
+
+static struct platform_driver switch_driver = {
+       .probe          = switch_drv_probe,
+       .remove         = 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("GPLv2");