Commit 16c10bed authored by Mathias Crombez's avatar Mathias Crombez Committed by Michael S. Tsirkin
Browse files

virtio-input: add multi-touch support 



Without multi-touch slots allocated, ABS_MT_SLOT events will be lost by
input_handle_abs_event.

Implementation is based on uinput_create_device.

Signed-off-by: default avatarMathias Crombez <mathias.crombez@faurecia.com>
Co-developed-by: default avatarVasyl Vavrychuk <vasyl.vavrychuk@opensynergy.com>
Signed-off-by: default avatarVasyl Vavrychuk <vasyl.vavrychuk@opensynergy.com>
Link: https://lore.kernel.org/r/20210115002623.8576-1-vasyl.vavrychuk@opensynergy.com


Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
Reviewed-by: default avatarGerd Hoffmann <kraxel@redhat.com>
parent 0c4aeb4b

drivers/virtio/virtio_input.c

+10 −1
Original line number Diff line number Diff line
@@ -7,6 +7,7 @@ 


#include <uapi/linux/virtio_ids.h>

#include <uapi/linux/virtio_input.h>

#include <linux/input/mt.h>



struct virtio_input {

	struct virtio_device       *vdev;
@@ -219,7 +220,7 @@ static int virtinput_probe(struct virtio_device *vdev) 
	struct virtio_input *vi;

	unsigned long flags;

	size_t size;

	int abs, err;

	int abs, err, nslots;



	if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1))

		return -ENODEV;
@@ -304,6 +305,13 @@ static int virtinput_probe(struct virtio_device *vdev) 
				continue;

			virtinput_cfg_abs(vi, abs);

		}



		if (test_bit(ABS_MT_SLOT, vi->idev->absbit)) {

			nslots = input_abs_get_max(vi->idev, ABS_MT_SLOT) + 1;

			err = input_mt_init_slots(vi->idev, nslots, 0);

			if (err)

				goto err_mt_init_slots;

		}

	}



	virtio_device_ready(vdev);
@@ -319,6 +327,7 @@ static int virtinput_probe(struct virtio_device *vdev) 
	spin_lock_irqsave(&vi->lock, flags);

	vi->ready = false;

	spin_unlock_irqrestore(&vi->lock, flags);

err_mt_init_slots:

	input_free_device(vi->idev);

err_input_alloc:

	vdev->config->del_vqs(vdev);