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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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6
drivers/leds/Kconfig
View File

@@ -152,7 +152,11 @@ config LEDS_TRIGGER_TIMER
depends on LEDS_TRIGGERS
help
This allows LEDs to be controlled by a programmable timer
via sysfs. If unsure, say Y.
via sysfs. Some LED hardware can be programmed to start
blinking the LED without any further software interaction.
For more details read Documentation/leds-class.txt.
If unsure, say Y.
config LEDS_TRIGGER_IDE_DISK
bool "LED IDE Disk Trigger"

41
drivers/leds/ledtrig-timer.c
View File

@@ -77,8 +77,21 @@ static ssize_t led_delay_on_store(struct device *dev,
count++;
if (count == size) {
timer_data->delay_on = state;
mod_timer(&timer_data->timer, jiffies + 1);
if (timer_data->delay_on != state) {
/* the new value differs from the previous */
timer_data->delay_on = state;
/* deactivate previous settings */
del_timer_sync(&timer_data->timer);
/* try to activate hardware acceleration, if any */
if (!led_cdev->blink_set ||
led_cdev->blink_set(led_cdev,
&timer_data->delay_on, &timer_data->delay_off)) {
/* no hardware acceleration, blink via timer */
mod_timer(&timer_data->timer, jiffies + 1);
}
}
ret = count;
}
@@ -110,8 +123,21 @@ static ssize_t led_delay_off_store(struct device *dev,
count++;
if (count == size) {
timer_data->delay_off = state;
mod_timer(&timer_data->timer, jiffies + 1);
if (timer_data->delay_off != state) {
/* the new value differs from the previous */
timer_data->delay_off = state;
/* deactivate previous settings */
del_timer_sync(&timer_data->timer);
/* try to activate hardware acceleration, if any */
if (!led_cdev->blink_set ||
led_cdev->blink_set(led_cdev,
&timer_data->delay_on, &timer_data->delay_off)) {
/* no hardware acceleration, blink via timer */
mod_timer(&timer_data->timer, jiffies + 1);
}
}
ret = count;
}
@@ -143,6 +169,13 @@ static void timer_trig_activate(struct led_classdev *led_cdev)
if (rc)
goto err_out_delayon;
/* If there is hardware support for blinking, start one
* user friendly blink rate chosen by the driver.
*/
if (led_cdev->blink_set)
led_cdev->blink_set(led_cdev,
&timer_data->delay_on, &timer_data->delay_off);
return;
err_out_delayon: