[PATCH] virtio_input: Initialize multi-touch slots on ABS_MT_SLOT

[Rudolf Streif <rstreif@blackberry.com>]

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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 <rstreif@blackberry.com>
---
 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


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