On Mon, 13 Jul 2020 00:38:21 +0200
Ondřej Jirman <megous@xxxxxxxxxx> wrote:
> Hello,
>
> On Sun, Jul 12, 2020 at 09:11:11PM +0200, Pavel Machek wrote:
> > Hi!
> >
>
> [....]
>
> > }
> > diff --git a/include/linux/leds.h b/include/linux/leds.h
> > index 2451962d1ec5..cba52714558f 100644
> > --- a/include/linux/leds.h
> > +++ b/include/linux/leds.h
> > @@ -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;
> > @@ -150,6 +154,8 @@ struct led_classdev {
> >
> > /* Ensures consistent access to the LED Flash Class device */
> > struct mutex led_access;
> > +
> > + struct led_hw_trigger_type *trigger_type;
> > };
> >
> > /**
> > @@ -345,6 +351,9 @@ 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;
>
> So after trying to use this, this seems to disallow the use of multiple HW
> triggers per LED. That's fine by me, because using one HW sysfs configured
> trigger per LED that use case is my proposal, but is it desireable in general?
Why? If you register one LED and several triggers, all sharing the same
trigger_type pointer, I think it should work.
Marek
