Hi Dmitry,
> On Jun 12, 2023, at 2:43 PM, James Ogletree <James.Ogletree@xxxxxxxxxx> wrote:
>
> At present, the best way to define effects that
> pre-exist in device memory is by utilizing
> the custom_data field, which it was not intended
> for, and requires arbitrary interpretation by
> the driver to make meaningful.
>
> Provide option for defining pre-stored effects in
> device memory.
>
> Signed-off-by: James Ogletree <james.ogletree@xxxxxxxxxx>
> ---
> include/uapi/linux/input.h | 32 ++++++++++++++++++++++----------
> 1 file changed, 22 insertions(+), 10 deletions(-)
>
> diff --git a/include/uapi/linux/input.h b/include/uapi/linux/input.h
> index 2557eb7b0561..689e5fa10647 100644
> --- a/include/uapi/linux/input.h
> +++ b/include/uapi/linux/input.h
> @@ -428,17 +428,27 @@ struct ff_rumble_effect {
> __u16 weak_magnitude;
> };
>
> +/**
> + * struct ff_prestored_effect - defines parameters of a pre-stored force-feedback effect
> + * @index: index of effect
> + * @bank: memory bank of effect
> + */
> +struct ff_prestored_effect {
> + __u16 index;
> + __u16 bank;
> +};
> +
> /**
> * struct ff_effect - defines force feedback effect
> * @type: type of the effect (FF_CONSTANT, FF_PERIODIC, FF_RAMP, FF_SPRING,
> - * FF_FRICTION, FF_DAMPER, FF_RUMBLE, FF_INERTIA, or FF_CUSTOM)
> + * FF_FRICTION, FF_DAMPER, FF_RUMBLE, FF_INERTIA, FF_PRESTORED, or FF_CUSTOM)
> * @id: an unique id assigned to an effect
> * @direction: direction of the effect
> * @trigger: trigger conditions (struct ff_trigger)
> * @replay: scheduling of the effect (struct ff_replay)
> * @u: effect-specific structure (one of ff_constant_effect, ff_ramp_effect,
> - * ff_periodic_effect, ff_condition_effect, ff_rumble_effect) further
> - * defining effect parameters
> + * ff_periodic_effect, ff_condition_effect, ff_rumble_effect, ff_prestored_effect)
> + * further defining effect parameters
> *
> * This structure is sent through ioctl from the application to the driver.
> * To create a new effect application should set its @id to -1; the kernel
> @@ -464,6 +474,7 @@ struct ff_effect {
> struct ff_periodic_effect periodic;
> struct ff_condition_effect condition[2]; /* One for each axis */
> struct ff_rumble_effect rumble;
> + struct ff_prestored_effect prestored;
> } u;
> };
>
> @@ -479,20 +490,21 @@ struct ff_effect {
> #define FF_DAMPER 0x55
> #define FF_INERTIA 0x56
> #define FF_RAMP 0x57
> +#define FF_PRESTORED 0x58
>
> #define FF_EFFECT_MIN FF_RUMBLE
> -#define FF_EFFECT_MAX FF_RAMP
> +#define FF_EFFECT_MAX FF_PRESTORED
>
> /*
> * Force feedback periodic effect types
> */
>
> -#define FF_SQUARE 0x58
> -#define FF_TRIANGLE 0x59
> -#define FF_SINE 0x5a
> -#define FF_SAW_UP 0x5b
> -#define FF_SAW_DOWN 0x5c
> -#define FF_CUSTOM 0x5d
> +#define FF_SQUARE 0x59
> +#define FF_TRIANGLE 0x5a
> +#define FF_SINE 0x5b
> +#define FF_SAW_UP 0x5c
> +#define FF_SAW_DOWN 0x5d
> +#define FF_CUSTOM 0x5e
>
> #define FF_WAVEFORM_MIN FF_SQUARE
> #define FF_WAVEFORM_MAX FF_CUSTOM
> --
> 2.25.1
>
Is there something more you’d like to see or discuss before considering applying this?
Best,
James
