[PATCH] virtio-input: add multi-touch support
From: Vasyl Vavrychuk <hidden>
Date: 2020-11-25 13:18:27
Also in:
linux-input
Subsystem:
the rest, virtio core, virtio input driver · Maintainers:
Linus Torvalds, "Michael S. Tsirkin", Jason Wang, Eugenio Pérez, Gerd Hoffmann
From: Mathias Crombez <redacted> Without multi-touch slots allocated, ABS_MT_SLOT events will be lost by input_handle_abs_event. Signed-off-by: Mathias Crombez <redacted> Signed-off-by: Vasyl Vavrychuk <redacted> Tested-by: Vasyl Vavrychuk <redacted> --- drivers/virtio/Kconfig | 11 +++++++++++ drivers/virtio/virtio_input.c | 8 ++++++++ 2 files changed, 19 insertions(+)
diff --git a/drivers/virtio/Kconfig b/drivers/virtio/Kconfig
index 7b41130d3f35..2cfd5b01d96d 100644
--- a/drivers/virtio/Kconfig
+++ b/drivers/virtio/Kconfig@@ -111,6 +111,17 @@ config VIRTIO_INPUT If unsure, say M. +config VIRTIO_INPUT_MULTITOUCH_SLOTS + depends on VIRTIO_INPUT + int "Number of multitouch slots" + range 0 64 + default 10 + help + Define the number of multitouch slots used. Default to 10. + This parameter is unused if there is no multitouch capability. + + 0 will disable the feature. + config VIRTIO_MMIO tristate "Platform bus driver for memory mapped virtio devices" depends on HAS_IOMEM && HAS_DMA
diff --git a/drivers/virtio/virtio_input.c b/drivers/virtio/virtio_input.c
index f1f6208edcf5..13f3d90e6c30 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;
@@ -205,6 +206,7 @@ static int virtinput_probe(struct virtio_device *vdev) unsigned long flags; size_t size; int abs, err; + bool is_mt = false; if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) return -ENODEV;
@@ -287,9 +289,15 @@ static int virtinput_probe(struct virtio_device *vdev) for (abs = 0; abs < ABS_CNT; abs++) { if (!test_bit(abs, vi->idev->absbit)) continue; + if (input_is_mt_value(abs)) + is_mt = true; virtinput_cfg_abs(vi, abs); } } + if (is_mt) + input_mt_init_slots(vi->idev, + CONFIG_VIRTIO_INPUT_MULTITOUCH_SLOTS, + INPUT_MT_DIRECT); virtio_device_ready(vdev); vi->ready = true; --
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