5 files changed, 178 insertions, 1 deletions

diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index d62183f355a3..a03f155571c8 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -473,6 +473,8 @@ config HEARTBEAT
           behavior is platform-dependent, but normally the flash frequency is
           a hyperbolic function of the 5-minute load average.
 
+source "arch/sh/drivers/Kconfig"
+
 endmenu
 
 config ISA_DMA_API
diff --git a/arch/sh/drivers/Kconfig b/arch/sh/drivers/Kconfig
new file mode 100644
index 000000000000..c54c758e6243
--- /dev/null
+++ b/arch/sh/drivers/Kconfig
@@ -0,0 +1,9 @@
+menu "Additional SuperH Device Drivers"
+
+config PUSH_SWITCH
+        tristate "Push switch support"
+        help
+          This enables support for the push switch framework, a simple
+          framework that allows for sysfs driven switch status reporting.
+
+endmenu
diff --git a/arch/sh/drivers/Makefile b/arch/sh/drivers/Makefile
index 338c3729d270..bf18dbfb6787 100644
--- a/arch/sh/drivers/Makefile
+++ b/arch/sh/drivers/Makefile
@@ -5,4 +5,4 @@
 obj-$(CONFIG_PCI)               += pci/
 obj-$(CONFIG_SH_DMA)            += dma/
 obj-$(CONFIG_SUPERHYWAY)        += superhyway/
-
+obj-$(CONFIG_PUSH_SWITCH)       += push-switch.o
diff --git a/arch/sh/drivers/push-switch.c b/arch/sh/drivers/push-switch.c
new file mode 100644
index 000000000000..f2b9157c314f
--- /dev/null
+++ b/arch/sh/drivers/push-switch.c
@@ -0,0 +1,138 @@
+/*
+ * 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 "0.1.0"
+
+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(void *data)
+{
+        struct platform_device *pdev = data;
+        struct push_switch *psw = platform_get_drvdata(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, pdev);
+        init_timer(&psw->debounce);
+
+        psw->debounce.function = switch_timer;
+        psw->debounce.data = (unsigned long)psw;
+
+        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");
diff --git a/include/asm-sh/push-switch.h b/include/asm-sh/push-switch.h
new file mode 100644
index 000000000000..dfc6bad567f0
--- /dev/null
+++ b/include/asm-sh/push-switch.h
@@ -0,0 +1,28 @@
+#ifndef __ASM_SH_PUSH_SWITCH_H
+#define __ASM_SH_PUSH_SWITCH_H
+
+#include <linux/timer.h>
+#include <linux/interrupt.h>
+#include <linux/workqueue.h>
+
+struct push_switch {
+        /* switch state */
+        unsigned int            state:1;
+        /* debounce timer */
+        struct timer_list       debounce;
+        /* workqueue */
+        struct work_struct      work;
+};
+
+struct push_switch_platform_info {
+        /* IRQ handler */
+        irqreturn_t             (*irq_handler)(int irq, void *data);
+        /* Special IRQ flags */
+        unsigned int            irq_flags;
+        /* Bit location of switch */
+        unsigned int            bit;
+        /* Symbolic switch name */
+        const char              *name;
+};
+
+#endif /* __ASM_SH_PUSH_SWITCH_H */