diff mbox series

[RESEND,v3] virtio-input: add multi-touch support

Message ID 20210115002623.8576-1-vasyl.vavrychuk@opensynergy.com (mailing list archive)
State New
Headers show
Series [RESEND,v3] virtio-input: add multi-touch support | expand

Commit Message

Vasyl Vavrychuk Jan. 15, 2021, 12:26 a.m. UTC
From: Mathias Crombez <mathias.crombez@faurecia.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@faurecia.com>
Co-developed-by: Vasyl Vavrychuk <vasyl.vavrychuk@opensynergy.com>
Signed-off-by: Vasyl Vavrychuk <vasyl.vavrychuk@opensynergy.com>
---
v2: fix patch corrupted by corporate email server
v3: use number of slots from the host

Resend since to feedback.

 drivers/virtio/virtio_input.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

Comments

Colin Xu Feb. 2, 2021, 12:17 a.m. UTC | #1
I second the support of MT with this one or other alternative.
This patch has been tested work in one of our POC project.
--
Best Regards,
Colin Xu

On Fri, 29 Jan 2021, Michael S. Tsirkin wrote:

> On Fri, Jan 29, 2021 at 02:06:54PM +0200, Vasyl Vavrychuk wrote:
>> Hi, All,
>>
>> There has been no reply to this patch.
>>
>> Is there anything I can do?
>>
>> Thanks,
>> Vasyl
>
> Gerd any input on this?
>
> _______________________________________________
> Virtualization mailing list
> Virtualization@lists.linux-foundation.org
> https://lists.linuxfoundation.org/mailman/listinfo/virtualization
>
Gerd Hoffmann Feb. 3, 2021, 2:22 p.m. UTC | #2
On Fri, Jan 15, 2021 at 02:26:23AM +0200, Vasyl Vavrychuk wrote:
> From: Mathias Crombez <mathias.crombez@faurecia.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@faurecia.com>
> Co-developed-by: Vasyl Vavrychuk <vasyl.vavrychuk@opensynergy.com>
> Signed-off-by: Vasyl Vavrychuk <vasyl.vavrychuk@opensynergy.com>
> ---
> v2: fix patch corrupted by corporate email server
> v3: use number of slots from the host
> 
> Resend since to feedback.
> 
>  drivers/virtio/virtio_input.c | 11 ++++++++++-
>  1 file changed, 10 insertions(+), 1 deletion(-)

Have no test hardware, the logic looks sane though.

Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>

take care,
  Gerd
diff mbox series

Patch

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);