leds: LED driver for National Semiconductor LP3944 Funlight Chip

LEDs driver for National Semiconductor LP3944 Funlight Chip
http://www.national.com/pf/LP/LP3944.html

This helper chip can drive up to 8 leds, with two programmable DIM
modes; it could even be used as a gpio expander but this driver assumes
it is used as a led controller.

The DIM modes are used to set _blink_ patterns for leds, the pattern is
specified supplying two parameters:
  - period: from 0s to 1.6s
  - duty cycle: percentage of the period the led is on, from 0 to 100

LP3944 can be found on Motorola A910 smartphone, where it drives the rgb
leds, the camera flash light and the displays backlights.

Signed-off-by: Antonio Ospite <ospite@studenti.unina.it>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index cfcd6bf831c9..7c8e7122aaa9 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -146,6 +146,17 @@ config LEDS_GPIO_OF
           of_platform devices.  For instance, LEDs which are listed in a "dts"
           file.
 
+config LEDS_LP3944
+        tristate "LED Support for N.S. LP3944 (Fun Light) I2C chip"
+        depends on LEDS_CLASS && I2C
+        help
+    This option enables support for LEDs connected to the National
+    Semiconductor LP3944 Lighting Management Unit (LMU) also known as
+    Fun Light Chip.
+
+          To compile this driver as a module, choose M here: the
+          module will be called leds-lp3944.
+
 config LEDS_CLEVO_MAIL
         tristate "Mail LED on Clevo notebook"
         depends on LEDS_CLASS && X86 && SERIO_I8042 && DMI