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leds: trigger: oneshot: Add initialization from Device Tree

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Allow initialization of delays used in oneshot trigger from Device
Tree property.

This is especially useful for embedded systems where the trigger might
be used early, before bringing up user-space.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
This commit is contained in:
Krzysztof Kozlowski 2019-01-09 15:44:48 +01:00 committed by Jacek Anaszewski
parent aa6fd10481
commit 9c9ab51e86
1 changed files with 36 additions and 2 deletions
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38
drivers/leds/trigger/ledtrig-oneshot.c
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@ -130,6 +130,34 @@ static struct attribute *oneshot_trig_attrs[] = {
};
ATTRIBUTE_GROUPS(oneshot_trig);
static void pattern_init(struct led_classdev *led_cdev)
{
u32 *pattern;
unsigned int size = 0;
pattern = led_get_default_pattern(led_cdev, &size);
if (!pattern)
goto out_default;
if (size != 2) {
dev_warn(led_cdev->dev,
"Expected 2 but got %u values for delays pattern\n",
size);
goto out_default;
}
led_cdev->blink_delay_on = pattern[0];
led_cdev->blink_delay_off = pattern[1];
kfree(pattern);
return;
out_default:
kfree(pattern);
led_cdev->blink_delay_on = DEFAULT_DELAY;
led_cdev->blink_delay_off = DEFAULT_DELAY;
}
static int oneshot_trig_activate(struct led_classdev *led_cdev)
{
struct oneshot_trig_data *oneshot_data;
@ -140,8 +168,14 @@ static int oneshot_trig_activate(struct led_classdev *led_cdev)
led_set_trigger_data(led_cdev, oneshot_data);
led_cdev->blink_delay_on = DEFAULT_DELAY;
led_cdev->blink_delay_off = DEFAULT_DELAY;
if (led_cdev->flags & LED_INIT_DEFAULT_TRIGGER) {
pattern_init(led_cdev);
/*
* Mark as initialized even on pattern_init() error because
* any consecutive call to it would produce the same error.
*/
led_cdev->flags &= ~LED_INIT_DEFAULT_TRIGGER;
}
return 0;
}