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>

3 files changed, 37 insertions, 0 deletions

diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index a3c525b2616a..bfb02c1a45ae 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -178,4 +178,13 @@ config THINKPAD_ACPI_BAY
 
           If you are not sure, say Y here.
 
+config BLINK
+        tristate "Keyboard blink driver"
+        help
+          Driver that when loaded will blink the keyboard LEDs continuously.
+          This is useful for debugging and for kernels that cannot necessarily
+          output something to the screen like kexec kernels to give the user
+          a visual indication that the kernel is doing something.
+
+
 endmenu
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index e32516459138..ece6baf76bc7 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -7,6 +7,7 @@ obj-$(CONFIG_IBM_ASM)		+= ibmasm/
 obj-$(CONFIG_HDPU_FEATURES)     += hdpuftrs/
 obj-$(CONFIG_MSI_LAPTOP)     += msi-laptop.o
 obj-$(CONFIG_ASUS_LAPTOP)     += asus-laptop.o
+obj-$(CONFIG_BLINK)             += blink.o
 obj-$(CONFIG_LKDTM)             += lkdtm.o
 obj-$(CONFIG_TIFM_CORE)         += tifm_core.o
 obj-$(CONFIG_TIFM_7XX1)         += tifm_7xx1.o
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);
+