v4.19.13 snapshot.
diff --git a/arch/sh/drivers/push-switch.c b/arch/sh/drivers/push-switch.c
new file mode 100644
index 0000000..762bc56
--- /dev/null
+++ b/arch/sh/drivers/push-switch.c
@@ -0,0 +1,139 @@
+/*
+ * 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/slab.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_RO(switch);
+
+static void switch_timer(struct timer_list *t)
+{
+ struct push_switch *psw = from_timer(psw, t, debounce);
+
+ 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,
+ 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);
+ timer_setup(&psw->debounce, switch_timer, 0);
+
+ /* 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_work(&psw->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("GPL v2");