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led-triggers: create a trigger for CPU activity

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Attempting to consolidate the ARM LED code, this removes the
custom RealView LED trigger code to turn LEDs on and off in
response to CPU activity and replace it with a standard trigger.

(bryan.wu@canonical.com:
It introduces several syscore stubs into this trigger.
It also provides ledtrig_cpu trigger event stub in <linux/leds.h>.
Although it was inspired by ARM work, it can be used in other arch.)

Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>
Reviewed-by: Jamie Iles <jamie@jamieiles.com>
Tested-by: Jochen Friedrich <jochen@scram.de>
This commit is contained in:
Bryan Wu
2011-06-25 18:33:50 +08:00
parent 28a33cbc24
commit 8f88731d05
4 changed files with 190 additions and 0 deletions
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include/linux/leds.h
+16
View File
@@ -212,4 +212,20 @@ struct gpio_led_platform_data {
struct platform_device *gpio_led_register_device(
int id, const struct gpio_led_platform_data *pdata);
enum cpu_led_event {
CPU_LED_IDLE_START, /* CPU enters idle */
CPU_LED_IDLE_END, /* CPU idle ends */
CPU_LED_START, /* Machine starts, especially resume */
CPU_LED_STOP, /* Machine stops, especially suspend */
CPU_LED_HALTED, /* Machine shutdown */
};
#ifdef CONFIG_LEDS_TRIGGER_CPU
extern void ledtrig_cpu(enum cpu_led_event evt);
#else
static inline void ledtrig_cpu(enum cpu_led_event evt)
{
return;
}
#endif
#endif /* __LINUX_LEDS_H_INCLUDED */