leds: add driver for LM3530 ALS

Simple backlight driver for National Semiconductor LM3530.  Presently only
manual mode is supported, PWM and ALS support to be added.

Signed-off-by: Shreshtha Kumar Sahu <shreshthakumar.sahu@stericsson.com>
Cc: Linus Walleij <linus.walleij@stericsson.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index 6f190f4cdbc0..9bec8699b8a3 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -34,6 +34,16 @@ config LEDS_ATMEL_PWM
           This option enables support for LEDs driven using outputs
           of the dedicated PWM controller found on newer Atmel SOCs.
 
+config LEDS_LM3530
+        tristate "LCD Backlight driver for LM3530"
+        depends on LEDS_CLASS
+        depends on I2C
+        help
+          This option enables support for the LCD backlight using
+          LM3530 ambient light sensor chip. This ALS chip can be
+          controlled manually or using PWM input or using ambient
+          light automatically.
+
 config LEDS_LOCOMO
         tristate "LED Support for Locomo device"
         depends on LEDS_CLASS