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leds: Add support for hardware accelerated LED flashing

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Extends the leds subsystem with a blink_set() callback function which can
be optionally implemented by a LED driver. If implemented, the driver can use
the hardware acceleration for blinking a LED.

Signed-off-by: Márton Németh <nm127@freemail.hu>
Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
This commit is contained in:
Márton Németh 2007-10-31 15:07:12 +01:00 • committed by Richard Purdie
parent 6c152beefb
commit 4c79141d28
4 changed files with 67 additions and 9 deletions
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5
include/linux/leds.h
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@ -38,6 +38,11 @@ struct led_classdev {
void (*brightness_set)(struct led_classdev *led_cdev,
enum led_brightness brightness);
/* Activate hardware accelerated blink */
int (*blink_set)(struct led_classdev *led_cdev,
unsigned long *delay_on,
unsigned long *delay_off);
struct device *dev;
struct list_head node; /* LED Device list */
char *default_trigger; /* Trigger to use */