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Date: Sat, 19 Dec 2020 01:17:51 +0200 From: Vasyl Vavrychuk <vasyl.vavrychuk@...nsynergy.com> To: <virtualization@...ts.linux-foundation.org>, <linux-kernel@...r.kernel.org>, <linux-input@...r.kernel.or> CC: "Michael S. Tsirkin" <mst@...hat.com>, Jason Wang <jasowang@...hat.com>, Gerd Hoffmann <kraxel@...hat.com>, Henrik Rydberg <rydberg@...math.org>, Dmitry Torokhov <dmitry.torokhov@...il.com>, Mathias Crombez <mathias.crombez@...recia.com>, Vasyl Vavrychuk <vasyl.vavrychuk@...nsynergy.com> Subject: [PATCH v3] virtio-input: add multi-touch support From: Mathias Crombez <mathias.crombez@...recia.com> 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: Mathias Crombez <mathias.crombez@...recia.com> Co-developed-by: Vasyl Vavrychuk <vasyl.vavrychuk@...nsynergy.com> Signed-off-by: Vasyl Vavrychuk <vasyl.vavrychuk@...nsynergy.com> --- v2: fix patch corrupted by corporate email server v3: use number of slots from the host drivers/virtio/virtio_input.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/drivers/virtio/virtio_input.c b/drivers/virtio/virtio_input.c index f1f6208edcf5..f643536807dd 100644 --- a/drivers/virtio/virtio_input.c +++ b/drivers/virtio/virtio_input.c @@ -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; @@ -204,7 +205,7 @@ 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; @@ -289,6 +290,13 @@ 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); @@ -304,6 +312,7 @@ 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); -- 2.23.0
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