For multi-touch devices the frontend needs to initialize the correct number of slots for touch tracking. Hardware drivers do this by calling input_mt_init_slots() on initialization. For virtio_input the function must be called when the backend sends ABS_MT_SLOT.
Signed-off-by: Rudolf J Streif <[email protected]> --- drivers/virtio/virtio_input.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/virtio/virtio_input.c b/drivers/virtio/virtio_input.c index 5ae529671b3d..582ba808b955 100644 --- a/drivers/virtio/virtio_input.c +++ b/drivers/virtio/virtio_input.c @@ -3,6 +3,7 @@ #include <linux/virtio.h> #include <linux/virtio_config.h> #include <linux/input.h> +#include <linux/input/mt.h> #include <uapi/linux/virtio_ids.h> #include <uapi/linux/virtio_input.h> @@ -164,6 +165,9 @@ static void virtinput_cfg_abs(struct virtio_input *vi, int abs) virtio_cread(vi->vdev, struct virtio_input_config, u.abs.flat, &fl); input_set_abs_params(vi->idev, abs, mi, ma, fu, fl); input_abs_set_res(vi->idev, abs, re); + + if (abs == ABS_MT_SLOT) + input_mt_init_slots(vi->idev, ma + 1, INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED); } static int virtinput_init_vqs(struct virtio_input *vi) -- 2.17.1 ---------------------------------------------------------------------- This transmission (including any attachments) may contain confidential information, privileged material (including material protected by the solicitor-client or other applicable privileges), or constitute non-public information. Any use of this information by anyone other than the intended recipient is prohibited. If you have received this transmission in error, please immediately reply to the sender and delete this information from your system. Use, dissemination, distribution, or reproduction of this transmission by unintended recipients is not authorized and may be unlawful.
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