diff options
| author |   Andi Kleen <ak@novell.com> | 2007-05-08 00:29:55 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-08 11:15:10 -0700 |
| commit | f038f9a361a764ed013447174b7170073f89cbe9 (patch) | |
| tree | 63963a1c5e8e0228d601637e9c96ebffd152a942 /drivers/misc | |
| parent | Add webpages' URL and summarize 3 lines. (diff) | |
| download | linux-dev-f038f9a361a764ed013447174b7170073f89cbe9.tar.xz linux-dev-f038f9a361a764ed013447174b7170073f89cbe9.zip | |
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>
Diffstat (limited to 'drivers/misc')
| -rw-r--r-- | drivers/misc/Kconfig | 9 | ||||
| -rw-r--r-- | drivers/misc/Makefile | 1 | ||||
| -rw-r--r-- | drivers/misc/blink.c | 27 |
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); + |