23 Jul, 2008
1 commit
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Fix an unsigned value overflow in the error handling code in the
Atmel PWM driver.Signed-off-by: Li Zefan
Signed-off-by: Richard Purdie
16 Apr, 2008
1 commit
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Since 43cc71eed1250755986da4c0f9898f9a635cb3bf, the platform
modalias is prefixed with "platform:". Add MODULE_ALIAS() to the
hotpluggable platform LED drivers, to re-enable auto loading.[dbrownell@users.sourceforge.net: more drivers, registration fixes]
Signed-off-by: Kay Sievers
Signed-off-by: David Brownell
Acked-by: Richard Purdie
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
09 Feb, 2008
1 commit
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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: David Brownell
Signed-off-by: Haavard Skinnemoen
Cc: Richard Purdie
Cc: Andrew Victor
Cc: Nicolas Ferre
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
