backlight: add LM3533 backlight driver
Add sub-driver for the backlights on National Semiconductor / TI LM3533
lighting power chips.
The chip provides 256 brightness levels and ambient-light-sensor and pwm
input control.
[akpm@linux-foundation.org: fix warning]
[akpm@linux-foundation.org: fix the type of `mode']
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Rob Landley <rob@landley.net>
Cc: Samuel Ortiz <sameo@linux.intel.com>
Cc: Jonathan Cameron <jic23@cam.ac.uk>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/Documentation/ABI/testing/sysfs-class-backlight-driver-lm3533 b/Documentation/ABI/testing/sysfs-class-backlight-driver-lm3533
new file mode 100644
index 0000000..77cf7ac
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-class-backlight-driver-lm3533
@@ -0,0 +1,48 @@
+What: /sys/class/backlight/<backlight>/als_channel
+Date: May 2012
+KernelVersion: 3.5
+Contact: Johan Hovold <jhovold@gmail.com>
+Description:
+ Get the ALS output channel used as input in
+ ALS-current-control mode (0, 1), where
+
+ 0 - out_current0 (backlight 0)
+ 1 - out_current1 (backlight 1)
+
+What: /sys/class/backlight/<backlight>/als_en
+Date: May 2012
+KernelVersion: 3.5
+Contact: Johan Hovold <jhovold@gmail.com>
+Description:
+ Enable ALS-current-control mode (0, 1).
+
+What: /sys/class/backlight/<backlight>/id
+Date: April 2012
+KernelVersion: 3.5
+Contact: Johan Hovold <jhovold@gmail.com>
+Description:
+ Get the id of this backlight (0, 1).
+
+What: /sys/class/backlight/<backlight>/linear
+Date: April 2012
+KernelVersion: 3.5
+Contact: Johan Hovold <jhovold@gmail.com>
+Description:
+ Set the brightness-mapping mode (0, 1), where
+
+ 0 - exponential mode
+ 1 - linear mode
+
+What: /sys/class/backlight/<backlight>/pwm
+Date: April 2012
+KernelVersion: 3.5
+Contact: Johan Hovold <jhovold@gmail.com>
+Description:
+ Set the PWM-input control mask (5 bits), where
+
+ bit 5 - PWM-input enabled in Zone 4
+ bit 4 - PWM-input enabled in Zone 3
+ bit 3 - PWM-input enabled in Zone 2
+ bit 2 - PWM-input enabled in Zone 1
+ bit 1 - PWM-input enabled in Zone 0
+ bit 0 - PWM-input enabled