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leds: Introduce userspace LED class driver

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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>
This commit is contained in:
David Lechner
2016-09-16 14:16:48 -05:00
committed by Jacek Anaszewski
parent 1001354ca3
commit e381322b01
6 changed files with 307 additions and 0 deletions
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8
drivers/leds/Kconfig
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@@ -659,6 +659,14 @@ config LEDS_MLXCPLD
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"