leds: Introduce userspace LED class driver
This driver creates a userspace leds driver similar to uinput.
New LEDs are created by opening /dev/uleds and writing a uleds_user_dev
struct. A new LED class device is registered with the name given in the
struct. Reading will return a single byte that is the current brightness.
The poll() syscall is also supported. It will be triggered whenever the
brightness changes. Closing the file handle to /dev/uleds will remove
the leds class device.
Signed-off-by: David Lechner <david@lechnology.com>
Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index 7a628c6..5fd3f4c 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -659,6 +659,14 @@
This option enabled support for the LEDs on the Mellanox
boards. Say Y to enabled these.
+config LEDS_USER
+ tristate "Userspace LED support"
+ depends on LEDS_CLASS
+ help
+ This option enables support for userspace LEDs. Say 'y' to enable this
+ support in kernel. To compile this driver as a module, choose 'm' here:
+ the module will be called uleds.
+
comment "LED Triggers"
source "drivers/leds/trigger/Kconfig"