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leds: trigger: add support for LED-private device triggers

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Some LED controllers may come with an internal HW triggering mechanism
for the LED and the ability to switch between SW control and the
internal HW control. This includes most PHYs, various ethernet switches,
the Turris Omnia LED controller or AXP20X PMIC.

This adds support for registering such triggers.

This code is based on work by Pavel Machek <pavel@ucw.cz> and
Ondřej Jirman <megous@megous.com>.

Signed-off-by: Marek Behún <marek.behun@nic.cz>
Acked-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
Signed-off-by: Pavel Machek <pavel@ucw.cz>
This commit is contained in:
Marek Behún 2020-07-16 19:17:28 +02:00 • committed by Pavel Machek
parent 00253ec2c9
commit 93690cdf30
2 changed files with 30 additions and 6 deletions
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10
include/linux/leds.h
View file

@ -57,6 +57,10 @@ struct led_init_data {
bool devname_mandatory;
};
struct led_hw_trigger_type {
int dummy;
};
struct led_classdev {
const char *name;
enum led_brightness brightness;
@ -141,6 +145,9 @@ struct led_classdev {
void *trigger_data;
/* true if activated - deactivate routine uses it to do cleanup */
bool activated;
/* LEDs that have private triggers have this set */
struct led_hw_trigger_type *trigger_type;
#endif
#ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED
@ -345,6 +352,9 @@ struct led_trigger {
int (*activate)(struct led_classdev *led_cdev);
void (*deactivate)(struct led_classdev *led_cdev);
/* LED-private triggers have this set */
struct led_hw_trigger_type *trigger_type;
/* LEDs under control by this trigger (for simple triggers) */
rwlock_t leddev_list_lock;
struct list_head led_cdevs;