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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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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 <dbrownell@users.sourceforge.net> Signed-off-by: Haavard 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: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
185 lines
5.5 KiB
Plaintext
185 lines
5.5 KiB
Plaintext
menuconfig NEW_LEDS
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bool "LED Support"
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depends on HAS_IOMEM
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help
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Say Y to enable Linux LED support. This allows control of supported
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LEDs from both userspace and optionally, by kernel events (triggers).
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This is not related to standard keyboard LEDs which are controlled
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via the input system.
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if NEW_LEDS
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config LEDS_CLASS
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tristate "LED Class Support"
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help
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This option enables the led sysfs class in /sys/class/leds. You'll
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need this to do anything useful with LEDs. If unsure, say N.
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comment "LED drivers"
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config LEDS_ATMEL_PWM
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tristate "LED Support using Atmel PWM outputs"
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depends on LEDS_CLASS && ATMEL_PWM
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help
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This option enables support for LEDs driven using outputs
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of the dedicated PWM controller found on newer Atmel SOCs.
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config LEDS_CORGI
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tristate "LED Support for the Sharp SL-C7x0 series"
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depends on LEDS_CLASS && PXA_SHARP_C7xx
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help
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This option enables support for the LEDs on Sharp Zaurus
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SL-C7x0 series (C700, C750, C760, C860).
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config LEDS_LOCOMO
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tristate "LED Support for Locomo device"
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depends on LEDS_CLASS && SHARP_LOCOMO
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help
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This option enables support for the LEDs on Sharp Locomo.
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Zaurus models SL-5500 and SL-5600.
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config LEDS_SPITZ
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tristate "LED Support for the Sharp SL-Cxx00 series"
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depends on LEDS_CLASS && PXA_SHARP_Cxx00
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help
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This option enables support for the LEDs on Sharp Zaurus
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SL-Cxx00 series (C1000, C3000, C3100).
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config LEDS_TOSA
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tristate "LED Support for the Sharp SL-6000 series"
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depends on LEDS_CLASS && PXA_SHARPSL
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help
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This option enables support for the LEDs on Sharp Zaurus
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SL-6000 series.
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config LEDS_S3C24XX
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tristate "LED Support for Samsung S3C24XX GPIO LEDs"
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depends on LEDS_CLASS && ARCH_S3C2410
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help
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This option enables support for LEDs connected to GPIO lines
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on Samsung S3C24XX series CPUs, such as the S3C2410 and S3C2440.
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config LEDS_AMS_DELTA
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tristate "LED Support for the Amstrad Delta (E3)"
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depends on LEDS_CLASS && MACH_AMS_DELTA
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help
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This option enables support for the LEDs on Amstrad Delta (E3).
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config LEDS_NET48XX
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tristate "LED Support for Soekris net48xx series Error LED"
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depends on LEDS_CLASS && SCx200_GPIO
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help
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This option enables support for the Soekris net4801 and net4826 error
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LED.
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config LEDS_WRAP
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tristate "LED Support for the WRAP series LEDs"
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depends on LEDS_CLASS && SCx200_GPIO
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help
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This option enables support for the PCEngines WRAP programmable LEDs.
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config LEDS_H1940
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tristate "LED Support for iPAQ H1940 device"
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depends on LEDS_CLASS && ARCH_H1940
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help
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This option enables support for the LEDs on the h1940.
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config LEDS_COBALT_QUBE
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tristate "LED Support for the Cobalt Qube series front LED"
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depends on LEDS_CLASS && MIPS_COBALT
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help
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This option enables support for the front LED on Cobalt Qube series
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config LEDS_COBALT_RAQ
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bool "LED Support for the Cobalt Raq series"
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depends on LEDS_CLASS && MIPS_COBALT
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select LEDS_TRIGGERS
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help
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This option enables support for the Cobalt Raq series LEDs.
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config LEDS_HP6XX
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tristate "LED Support for the HP Jornada 6xx"
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depends on LEDS_CLASS && SH_HP6XX
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help
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This option enables led support for the handheld
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HP Jornada 620/660/680/690.
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config LEDS_GPIO
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tristate "LED Support for GPIO connected LEDs"
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depends on LEDS_CLASS && GENERIC_GPIO
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help
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This option enables support for the LEDs connected to GPIO
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outputs. To be useful the particular board must have LEDs
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and they must be connected to the GPIO lines.
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config LEDS_CM_X270
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tristate "LED Support for the CM-X270 LEDs"
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depends on LEDS_CLASS && MACH_ARMCORE
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help
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This option enables support for the CM-X270 LEDs.
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config LEDS_CLEVO_MAIL
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tristate "Mail LED on Clevo notebook (EXPERIMENTAL)"
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depends on LEDS_CLASS && X86 && SERIO_I8042 && DMI && EXPERIMENTAL
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help
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This driver makes the mail LED accessible from userspace
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programs through the leds subsystem. This LED have three
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known mode: off, blink at 0.5Hz and blink at 1Hz.
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The driver supports two kinds of interface: using ledtrig-timer
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or through /sys/class/leds/clevo::mail/brightness. As this LED
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cannot change it's brightness it blinks instead. The brightness
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value 0 means off, 1..127 means blink at 0.5Hz and 128..255 means
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blink at 1Hz.
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This module can drive the mail LED for the following notebooks:
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Clevo D410J
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Clevo D410V
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Clevo D400V/D470V (not tested, but might work)
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Clevo M540N
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Clevo M5x0N (not tested, but might work)
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Positivo Mobile (Clevo M5x0V)
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To compile this driver as a module, choose M here: the
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module will be called leds-clevo-mail.
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comment "LED Triggers"
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config LEDS_TRIGGERS
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bool "LED Trigger support"
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help
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This option enables trigger support for the leds class.
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These triggers allow kernel events to drive the LEDs and can
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be configured via sysfs. If unsure, say Y.
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config LEDS_TRIGGER_TIMER
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tristate "LED Timer Trigger"
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depends on LEDS_TRIGGERS
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help
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This allows LEDs to be controlled by a programmable timer
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via sysfs. Some LED hardware can be programmed to start
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blinking the LED without any further software interaction.
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For more details read Documentation/leds-class.txt.
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If unsure, say Y.
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config LEDS_TRIGGER_IDE_DISK
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bool "LED IDE Disk Trigger"
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depends on LEDS_TRIGGERS && BLK_DEV_IDEDISK
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help
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This allows LEDs to be controlled by IDE disk activity.
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If unsure, say Y.
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config LEDS_TRIGGER_HEARTBEAT
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tristate "LED Heartbeat Trigger"
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depends on LEDS_TRIGGERS
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help
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This allows LEDs to be controlled by a CPU load average.
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The flash frequency is a hyperbolic function of the 1-minute
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load average.
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If unsure, say Y.
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endif # NEW_LEDS
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