1. 13 Nov, 2013 1 commit
  2. 30 Apr, 2013 2 commits
  3. 22 Feb, 2013 1 commit
  4. 18 Dec, 2012 1 commit
    • Kim, Milo's avatar
      drivers/video/backlight/lp855x_bl.c: use generic PWM functions · 8cc9764c
      Kim, Milo authored
      The LP855x family devices support the PWM input for the backlight control.
       Period of the PWM is configurable in the platform side.  Platform
      specific functions are unnecessary anymore because generic PWM functions
      are used inside the driver.
      
      (PWM input mode)
      To set the brightness, new lp855x_pwm_ctrl() is used.
      If a PWM device is not allocated, devm_pwm_get() is called.
      The PWM consumer name is from the chip name such as 'lp8550' and 'lp8556'.
      To get the brightness value, no additional handling is required.
      Just the value of 'props.brightness' is returned.
      
      If the PWM driver is not ready while initializing the LP855x driver, it's
      OK.  The PWM device can be retrieved later, when the brightness value is
      changed.
      
      Documentation is updated with an example.
      
      [akpm@linux-foundation.org: coding-style simplification, per Thierry]
      Signed-off-by: 's avatarMilo(Woogyom) Kim <milo.kim@ti.com>
      Cc: Thierry Reding <thierry.reding@avionic-design.de>
      Cc: Richard Purdie <rpurdie@rpsys.net>
      Cc: Bryan Wu <bryan.wu@canonical.com>
      Signed-off-by: 's avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: 's avatarLinus Torvalds <torvalds@linux-foundation.org>
      8cc9764c
  5. 23 Mar, 2012 1 commit
    • Kim, Milo's avatar
      backlight: new backlight driver for LP855x devices · 7be865ab
      Kim, Milo authored
      THis driver supports TI LP8550/LP8551/LP8552/LP8553/LP8556 backlight
      devices.
      
      The brightness can be controlled by the I2C or PWM input.  The lp855x
      driver provides both modes.  For the PWM control, pwm-specific functions
      can be defined in the platform data.  And some information can be read
      via the sysfs(lp855x device attributes).
      
      For details, please refer to Documentation/backlight/lp855x-driver.txt.
      
      [axel.lin@gmail.com: add missing mutex_unlock in lp855x_read_byte() error path]
      [axel.lin@gmail.com: check platform data in lp855x_probe()]
      [axel.lin@gmail.com: small cleanups]
      [dan.carpenter@oracle.com: silence a compiler warning]
      [axel.lin@gmail.com: use id->driver_data to differentiate lp855x chips]
      [akpm@linux-foundation.org: simplify boolean return expression]
      Signed-off-by: 's avatarMilo(Woogyom) Kim <milo.kim@ti.com>
      Signed-off-by: 's avatarAxel Lin <axel.lin@gmail.com>
      Signed-off-by: 's avatarDan Carpenter <dan.carpenter@oracle.com>
      Cc: Richard Purdie <rpurdie@rpsys.net>
      Signed-off-by: 's avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: 's avatarLinus Torvalds <torvalds@linux-foundation.org>
      7be865ab