Add keyboard blink driver

Simple driver that blinks the keyboard LEDs when loaded.  Useful for
checking that the kernel is still alive or for crashdumping

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 27 insertions, 0 deletions

diff --git a/drivers/misc/blink.c b/drivers/misc/blink.c
new file mode 100644
index 000000000000..634431ce1184
--- /dev/null
+++ b/drivers/misc/blink.c
@@ -0,0 +1,27 @@
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/timer.h>
+#include <linux/jiffies.h>
+
+static void do_blink(unsigned long data);
+
+static DEFINE_TIMER(blink_timer, do_blink, 0 ,0);
+
+static void do_blink(unsigned long data)
+{
+        static long count;
+        if (panic_blink)
+                panic_blink(count++);
+        blink_timer.expires = jiffies + msecs_to_jiffies(1);
+        add_timer(&blink_timer);
+}
+
+static int blink_init(void)
+{
+        printk(KERN_INFO "Enabling keyboard blinking\n");
+        do_blink(0);
+        return 0;
+}
+
+module_init(blink_init);
+