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From 16c10bede8b3d8594279752bf53153491f3f944f Mon Sep 17 00:00:00 2001
From: Mathias Crombez <mathias.crombez@faurecia.com>
Date: Fri, 15 Jan 2021 02:26:23 +0200
Subject: [PATCH] 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: Mathias Crombez <mathias.crombez@faurecia.com>
Co-developed-by: Vasyl Vavrychuk <vasyl.vavrychuk@opensynergy.com>
Signed-off-by: Vasyl Vavrychuk <vasyl.vavrychuk@opensynergy.com>
Link: https://lore.kernel.org/r/20210115002623.8576-1-vasyl.vavrychuk@opensynergy.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
---
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 244965c20d9b..ce51ae165943 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;
@@ -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);
--
2.31.1
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