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There already is a "default-on" trigger but there are problems with it. For one, it's a inefficient way to do it and requires led trigger support to be compiled in. But the real reason is that is produces a glitch on the LED. The GPIO is allocate with the LED *off*, then *later* when the trigger runs it is turned back on. If the LED was already on via the GPIO's reset default or action of the firmware, this produces a glitch where the LED goes from on to off to on. While normally this is fast enough that it wouldn't be noticeable to a human observer, there are still serious problems. One is that there may be something else on the GPIO line, like a hardware alarm or watchdog, that is fast enough to notice the glitch. Another is that the kernel may panic before the LED is turned back on, thus hanging with the LED in the wrong state. This is not just speculation, but actually happened to me with an embedded system that has an LED which should turn off when the kernel finishes booting, which was left in the incorrect state due to a bug in the OF LED binding code. We also let GPIO LEDs get their initial value from whatever the current state of the GPIO line is. On some systems the LEDs are put into some state by the firmware or hardware before Linux boots, and it is desired to have them keep this state which is otherwise unknown to Linux. This requires that the underlying GPIO driver support reading the value of output GPIOs. Some drivers support this and some do not. The platform device binding gains a field in the platform data "default_state" that controls this. There are three constants defined to select from on, off, or keeping the current state. The OpenFirmware binding uses a property named "default-state" that can be set to "on", "off", or "keep". The default if the property isn't present is off. Signed-off-by: Trent Piepho <xyzzy@speakeasy.org> Acked-by: Grant Likely <grant.likely@secretlab.ca> Acked-by: Wolfram Sang <w.sang@pengutronix.de> Acked-by: Sean MacLennan <smaclennan@pikatech.com> Signed-off-by: Richard Purdie <rpurdie@linux.intel.com> |
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| .. | ||
| Kconfig | ||
| led-class.c | ||
| led-core.c | ||
| led-triggers.c | ||
| leds-alix2.c | ||
| leds-ams-delta.c | ||
| leds-atmel-pwm.c | ||
| leds-bd2802.c | ||
| leds-clevo-mail.c | ||
| leds-cobalt-qube.c | ||
| leds-cobalt-raq.c | ||
| leds-da903x.c | ||
| leds-dac124s085.c | ||
| leds-fsg.c | ||
| leds-gpio.c | ||
| leds-h1940.c | ||
| leds-hp6xx.c | ||
| leds-locomo.c | ||
| leds-lp3944.c | ||
| leds-net48xx.c | ||
| leds-pca955x.c | ||
| leds-pca9532.c | ||
| leds-pwm.c | ||
| leds-rb532.c | ||
| leds-s3c24xx.c | ||
| leds-sunfire.c | ||
| leds-wm8350.c | ||
| leds-wrap.c | ||
| leds.h | ||
| ledtrig-backlight.c | ||
| ledtrig-default-on.c | ||
| ledtrig-gpio.c | ||
| ledtrig-heartbeat.c | ||
| ledtrig-ide-disk.c | ||
| ledtrig-timer.c | ||
| Makefile | ||