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  1. 01 4月, 2008 2 次提交
  3. 09 2月, 2008 1 次提交
    • D
      PWM LED driver · de5c9ede
      由 David Brownell 提交于 
      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: NDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: NHaavard 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: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      de5c9ede
  5. 07 2月, 2008 8 次提交
  7. 06 2月, 2008 1 次提交
  9. 01 1月, 2008 2 次提交
  11. 07 12月, 2007 1 次提交
  13. 06 11月, 2007 1 次提交
    • D
      leds: bugfixes for leds-gpio · 199fb21d
      由 David Brownell 提交于 
      Three bugfixes to the leds-gpio driver, plus minor whitespace tweaks:

 - Do the INIT_WORK() before registering each LED, so if its trigger
   becomes immediately active it can schedule work without oopsing..

 - Use normal registration, not platform_driver_probe(), so that
   devices appearing "late" (hotplug type) can still be bound.

 - Mark the driver remove code as "__devexit", preventing oopses
   when the underlying device is removed.

These issues came up when using this driver with some GPIO expanders
living on serial busses, which act unlike "normal" platform devices:
they can appear and vanish along with the serial bus driver.
Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: NRichard Purdie <rpurdie@rpsys.net>
      199fb21d
  15. 20 10月, 2007 1 次提交
  17. 16 10月, 2007 1 次提交
  19. 13 10月, 2007 1 次提交
    • A
      kconfig: syntax cleanup - drop support for "depends/requires/def_boolean" · 247537b9
      由 Adrian Bunk 提交于 
      Remove the following redundant and never or rarely used kconfig syntax:

- "def_boolean" (same as "def_bool")
- "requires" (same as "depends on")
- "depends" (same as "depends on")

This patch contains the code changes and Kconfig updates.
The shipped files are in next patch to let actual codechange stand out.
Signed-off-by: NAdrian Bunk <bunk@kernel.org>
Cc: "Randy.Dunlap" <rdunlap@xenotime.net>
Cc: Bryan Wu <bryan.wu@analog.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Dmitry Torokhov <dtor@mail.ru>
Cc: "John W. Linville" <linville@tuxdriver.com>
Cc: Roman Zippel <zippel@linux-m68k.org>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>
      247537b9
  21. 12 10月, 2007 3 次提交
  23. 16 7月, 2007 6 次提交
  25. 10 5月, 2007 1 次提交
  27. 09 5月, 2007 1 次提交
  29. 16 2月, 2007 2 次提交
  31. 06 1月, 2007 1 次提交
  33. 13 12月, 2006 1 次提交
  35. 08 12月, 2006 1 次提交
    • K
      [PATCH] PCEngines WRAP LED Support · 0d75565f
      由 Kristian Kielhofner 提交于 
      A driver for the PCEngines WRAP boards (http://www.pcengines.ch), which are
very similar to the Soekris net4801 (same NS SC1100 geode reference
design).

The LEDs on the WRAP are on different GPIO lines and I have modified and
copied the net48xx error led support for this.  It also includes support
for an "extra" led (in addition to error).  The three LEDs on the WRAP are
at GPIO lines 2,3,18 (WRAP LEDs from left to right).  This driver gives
access to the second and third LEDs by twiddling GPIO lines 3 & 18.

Because these boards are so similar to the net48xx, I basically sed-ed that
driver to form the basis for leds-wrap.c.  The only changes from
leds-net48xx.c are:

 - #define WRAP_EXTRA_LED_GPIO

 - name changes

 - duplicate relevant sections to provide support for the "extra" led

 - reverse the various *_led_set values.  The WRAP is "backwards" from the
   net48xx, and these needed to be updated for that.

[akpm@osdl.org: build fix]
Signed-off-by: NKristian Kielhofner <kris@krisk.org>
Acked-by: NRichard Purdie <rpurdie@rpsys.net>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      0d75565f
  37. 04 12月, 2006 1 次提交
  39. 17 10月, 2006 1 次提交
  41. 04 10月, 2006 3 次提交