diff options
Diffstat (limited to 'drivers/virtio/virtio_input.c')
| -rw-r--r-- | drivers/virtio/virtio_input.c | 78 |
1 files changed, 54 insertions, 24 deletions
diff --git a/drivers/virtio/virtio_input.c b/drivers/virtio/virtio_input.c index 3a0468f2ceb0..d0728285b6ce 100644 --- a/drivers/virtio/virtio_input.c +++ b/drivers/virtio/virtio_input.c @@ -1,10 +1,13 @@ +// SPDX-License-Identifier: GPL-2.0-only #include <linux/module.h> #include <linux/virtio.h> #include <linux/virtio_config.h> #include <linux/input.h> +#include <linux/slab.h> #include <uapi/linux/virtio_ids.h> #include <uapi/linux/virtio_input.h> +#include <linux/input/mt.h> struct virtio_input { struct virtio_device *vdev; @@ -62,6 +65,21 @@ static int virtinput_send_status(struct virtio_input *vi, unsigned long flags; int rc; + /* + * Since 29cc309d8bf1 (HID: hid-multitouch: forward MSC_TIMESTAMP), + * EV_MSC/MSC_TIMESTAMP is added to each before EV_SYN event. + * EV_MSC is configured as INPUT_PASS_TO_ALL. + * In case of touch device: + * BE pass EV_MSC/MSC_TIMESTAMP to FE on receiving event from evdev. + * FE pass EV_MSC/MSC_TIMESTAMP back to BE. + * BE writes EV_MSC/MSC_TIMESTAMP to evdev due to INPUT_PASS_TO_ALL. + * BE receives extra EV_MSC/MSC_TIMESTAMP and pass to FE. + * >>> Each new frame becomes larger and larger. + * Disable EV_MSC/MSC_TIMESTAMP forwarding for MT. + */ + if (vi->idev->mt && type == EV_MSC && code == MSC_TIMESTAMP) + return 0; + stsbuf = kzalloc(sizeof(*stsbuf), GFP_ATOMIC); if (!stsbuf) return -ENOMEM; @@ -111,9 +129,9 @@ static u8 virtinput_cfg_select(struct virtio_input *vi, { u8 size; - virtio_cwrite(vi->vdev, struct virtio_input_config, select, &select); - virtio_cwrite(vi->vdev, struct virtio_input_config, subsel, &subsel); - virtio_cread(vi->vdev, struct virtio_input_config, size, &size); + virtio_cwrite_le(vi->vdev, struct virtio_input_config, select, &select); + virtio_cwrite_le(vi->vdev, struct virtio_input_config, subsel, &subsel); + virtio_cread_le(vi->vdev, struct virtio_input_config, size, &size); return size; } @@ -156,24 +174,25 @@ static void virtinput_cfg_abs(struct virtio_input *vi, int abs) u32 mi, ma, re, fu, fl; virtinput_cfg_select(vi, VIRTIO_INPUT_CFG_ABS_INFO, abs); - virtio_cread(vi->vdev, struct virtio_input_config, u.abs.min, &mi); - virtio_cread(vi->vdev, struct virtio_input_config, u.abs.max, &ma); - virtio_cread(vi->vdev, struct virtio_input_config, u.abs.res, &re); - virtio_cread(vi->vdev, struct virtio_input_config, u.abs.fuzz, &fu); - virtio_cread(vi->vdev, struct virtio_input_config, u.abs.flat, &fl); + virtio_cread_le(vi->vdev, struct virtio_input_config, u.abs.min, &mi); + virtio_cread_le(vi->vdev, struct virtio_input_config, u.abs.max, &ma); + virtio_cread_le(vi->vdev, struct virtio_input_config, u.abs.res, &re); + virtio_cread_le(vi->vdev, struct virtio_input_config, u.abs.fuzz, &fu); + virtio_cread_le(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); } static int virtinput_init_vqs(struct virtio_input *vi) { + struct virtqueue_info vqs_info[] = { + { "events", virtinput_recv_events }, + { "status", virtinput_recv_status }, + }; struct virtqueue *vqs[2]; - vq_callback_t *cbs[] = { virtinput_recv_events, - virtinput_recv_status }; - static const char * const names[] = { "events", "status" }; int err; - err = virtio_find_vqs(vi->vdev, 2, vqs, cbs, names, NULL); + err = virtio_find_vqs(vi->vdev, 2, vqs, vqs_info, NULL); if (err) return err; vi->evt = vqs[0]; @@ -202,7 +221,7 @@ 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; @@ -242,14 +261,14 @@ static int virtinput_probe(struct virtio_device *vdev) size = virtinput_cfg_select(vi, VIRTIO_INPUT_CFG_ID_DEVIDS, 0); if (size >= sizeof(struct virtio_input_devids)) { - virtio_cread(vi->vdev, struct virtio_input_config, - u.ids.bustype, &vi->idev->id.bustype); - virtio_cread(vi->vdev, struct virtio_input_config, - u.ids.vendor, &vi->idev->id.vendor); - virtio_cread(vi->vdev, struct virtio_input_config, - u.ids.product, &vi->idev->id.product); - virtio_cread(vi->vdev, struct virtio_input_config, - u.ids.version, &vi->idev->id.version); + virtio_cread_le(vi->vdev, struct virtio_input_config, + u.ids.bustype, &vi->idev->id.bustype); + virtio_cread_le(vi->vdev, struct virtio_input_config, + u.ids.vendor, &vi->idev->id.vendor); + virtio_cread_le(vi->vdev, struct virtio_input_config, + u.ids.product, &vi->idev->id.product); + virtio_cread_le(vi->vdev, struct virtio_input_config, + u.ids.version, &vi->idev->id.version); } else { vi->idev->id.bustype = BUS_VIRTUAL; } @@ -287,6 +306,13 @@ 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); @@ -302,6 +328,7 @@ err_input_register: 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); @@ -321,7 +348,7 @@ static void virtinput_remove(struct virtio_device *vdev) spin_unlock_irqrestore(&vi->lock, flags); input_unregister_device(vi->idev); - vdev->config->reset(vdev); + virtio_reset_device(vdev); while ((buf = virtqueue_detach_unused_buf(vi->sts)) != NULL) kfree(buf); vdev->config->del_vqs(vdev); @@ -333,11 +360,15 @@ static int virtinput_freeze(struct virtio_device *vdev) { struct virtio_input *vi = vdev->priv; unsigned long flags; + void *buf; spin_lock_irqsave(&vi->lock, flags); vi->ready = false; spin_unlock_irqrestore(&vi->lock, flags); + virtio_reset_device(vdev); + while ((buf = virtqueue_detach_unused_buf(vi->sts)) != NULL) + kfree(buf); vdev->config->del_vqs(vdev); return 0; } @@ -361,14 +392,13 @@ static int virtinput_restore(struct virtio_device *vdev) static unsigned int features[] = { /* none */ }; -static struct virtio_device_id id_table[] = { +static const struct virtio_device_id id_table[] = { { VIRTIO_ID_INPUT, VIRTIO_DEV_ANY_ID }, { 0 }, }; static struct virtio_driver virtio_input_driver = { .driver.name = KBUILD_MODNAME, - .driver.owner = THIS_MODULE, .feature_table = features, .feature_table_size = ARRAY_SIZE(features), .id_table = id_table, |