sh: generic push-switch framework.

This adds support for a generic push switch framework. Adaptable for
various switches, including GPIO switches and the push switches commonly
found on Renesas debug boards.

This allows switch states to be trivially reported through sysfs.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 28 insertions, 0 deletions

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 */