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  1. 23 Mar, 2011 1 commit
  2. 12 Nov, 2010 1 commit
  3. 07 Oct, 2010 1 commit
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  7. 07 Mar, 2010 1 commit
  8. 17 Dec, 2009 1 commit
  9. 16 Dec, 2009 3 commits
  10. 07 Sep, 2009 1 commit
    • Mark Brown's avatar
      leds: Add WM831x status LED driver · c746b551
      Mark Brown authored
      The WM831x devices feature two software controlled status LEDs with
      hardware assisted blinking.
      
      The device can also autonomously control the LEDs based on a selection
      of sources.  This can be configured at boot time using either platform
      data or the chip OTP.  A sysfs file in the style of that for triggers
      allowing the control source to be configured at run time.  Triggers
      can't be used here since they can't depend on the implementation details
      of a specific LED type.
      Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
      Signed-off-by: default avatarRichard Purdie <rpurdie@linux.intel.com>
      c746b551
  11. 23 Jun, 2009 1 commit
  12. 06 Apr, 2009 5 commits
  13. 16 Jan, 2009 1 commit
  14. 08 Jan, 2009 2 commits
  15. 20 Oct, 2008 4 commits
  16. 23 Sep, 2008 2 commits
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  19. 24 Apr, 2008 2 commits
  20. 19 Apr, 2008 1 commit
  21. 08 Feb, 2008 1 commit
    • David Brownell's avatar
      PWM LED driver · de5c9ede
      David Brownell authored
      This is a LED driver using the PWM on newer SOCs from Atmel; brightness is
      controlled by changing the PWM duty cycle.  So for example if you've set up
      two leds labeled "pwm0" and "pwm1":
      
      	echo 0 > /sys/class/leds/pwm2/brightness	# off (0%)
      	echo 80 > /sys/class/leds/pwm2/brightness
      	echo 255 > /sys/class/leds/pwm2/brightness	# on (100%)
      
      Note that "brightness" here isn't linear; maybe that should change.  Going
      from 4 to 8 probably doubles perceived brightness, while 244 to 248 is
      imperceptible.
      
      This is mostly intended to be a simple example of PWM, although it's
      realistic since LCD backlights are often driven with PWM to conserve
      battery power (and offer brightness options).
      Signed-off-by: default avatarDavid Brownell <dbrownell@users.sourceforge.net>
      Signed-off-by: default avatarHaavard Skinnemoen <hskinnemoen@atmel.com>
      Cc: Richard Purdie <rpurdie@rpsys.net>
      Cc: Andrew Victor <linux@maxim.org.za>
      Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      de5c9ede
  22. 07 Feb, 2008 3 commits
  23. 15 Oct, 2007 1 commit
  24. 11 Oct, 2007 1 commit