415 lines
11 KiB
C
415 lines
11 KiB
C
|
// 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;
|
||
|
|
struct input_dev *idev;
|
||
|
|
char name[64];
|
||
|
|
char serial[64];
|
||
|
|
char phys[64];
|
||
|
|
struct virtqueue *evt, *sts;
|
||
|
|
struct virtio_input_event evts[64];
|
||
|
|
spinlock_t lock;
|
||
|
|
bool ready;
|
||
|
|
};
|
||
|
|
|
||
|
|
static void virtinput_queue_evtbuf(struct virtio_input *vi,
|
||
|
|
struct virtio_input_event *evtbuf)
|
||
|
|
{
|
||
|
|
struct scatterlist sg[1];
|
||
|
|
|
||
|
|
sg_init_one(sg, evtbuf, sizeof(*evtbuf));
|
||
|
|
virtqueue_add_inbuf(vi->evt, sg, 1, evtbuf, GFP_ATOMIC);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void virtinput_recv_events(struct virtqueue *vq)
|
||
|
|
{
|
||
|
|
struct virtio_input *vi = vq->vdev->priv;
|
||
|
|
struct virtio_input_event *event;
|
||
|
|
unsigned long flags;
|
||
|
|
unsigned int len;
|
||
|
|
|
||
|
|
spin_lock_irqsave(&vi->lock, flags);
|
||
|
|
if (vi->ready) {
|
||
|
|
while ((event = virtqueue_get_buf(vi->evt, &len)) != NULL) {
|
||
|
|
spin_unlock_irqrestore(&vi->lock, flags);
|
||
|
|
input_event(vi->idev,
|
||
|
|
le16_to_cpu(event->type),
|
||
|
|
le16_to_cpu(event->code),
|
||
|
|
le32_to_cpu(event->value));
|
||
|
|
spin_lock_irqsave(&vi->lock, flags);
|
||
|
|
virtinput_queue_evtbuf(vi, event);
|
||
|
|
}
|
||
|
|
virtqueue_kick(vq);
|
||
|
|
}
|
||
|
|
spin_unlock_irqrestore(&vi->lock, flags);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* On error we are losing the status update, which isn't critical as
|
||
|
|
* this is typically used for stuff like keyboard leds.
|
||
|
|
*/
|
||
|
|
static int virtinput_send_status(struct virtio_input *vi,
|
||
|
|
u16 type, u16 code, s32 value)
|
||
|
|
{
|
||
|
|
struct virtio_input_event *stsbuf;
|
||
|
|
struct scatterlist sg[1];
|
||
|
|
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;
|
||
|
|
|
||
|
|
stsbuf->type = cpu_to_le16(type);
|
||
|
|
stsbuf->code = cpu_to_le16(code);
|
||
|
|
stsbuf->value = cpu_to_le32(value);
|
||
|
|
sg_init_one(sg, stsbuf, sizeof(*stsbuf));
|
||
|
|
|
||
|
|
spin_lock_irqsave(&vi->lock, flags);
|
||
|
|
if (vi->ready) {
|
||
|
|
rc = virtqueue_add_outbuf(vi->sts, sg, 1, stsbuf, GFP_ATOMIC);
|
||
|
|
virtqueue_kick(vi->sts);
|
||
|
|
} else {
|
||
|
|
rc = -ENODEV;
|
||
|
|
}
|
||
|
|
spin_unlock_irqrestore(&vi->lock, flags);
|
||
|
|
|
||
|
|
if (rc != 0)
|
||
|
|
kfree(stsbuf);
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void virtinput_recv_status(struct virtqueue *vq)
|
||
|
|
{
|
||
|
|
struct virtio_input *vi = vq->vdev->priv;
|
||
|
|
struct virtio_input_event *stsbuf;
|
||
|
|
unsigned long flags;
|
||
|
|
unsigned int len;
|
||
|
|
|
||
|
|
spin_lock_irqsave(&vi->lock, flags);
|
||
|
|
while ((stsbuf = virtqueue_get_buf(vi->sts, &len)) != NULL)
|
||
|
|
kfree(stsbuf);
|
||
|
|
spin_unlock_irqrestore(&vi->lock, flags);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int virtinput_status(struct input_dev *idev, unsigned int type,
|
||
|
|
unsigned int code, int value)
|
||
|
|
{
|
||
|
|
struct virtio_input *vi = input_get_drvdata(idev);
|
||
|
|
|
||
|
|
return virtinput_send_status(vi, type, code, value);
|
||
|
|
}
|
||
|
|
|
||
|
|
static u8 virtinput_cfg_select(struct virtio_input *vi,
|
||
|
|
u8 select, u8 subsel)
|
||
|
|
{
|
||
|
|
u8 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;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void virtinput_cfg_bits(struct virtio_input *vi, int select, int subsel,
|
||
|
|
unsigned long *bits, unsigned int bitcount)
|
||
|
|
{
|
||
|
|
unsigned int bit;
|
||
|
|
u8 *virtio_bits;
|
||
|
|
u8 bytes;
|
||
|
|
|
||
|
|
bytes = virtinput_cfg_select(vi, select, subsel);
|
||
|
|
if (!bytes)
|
||
|
|
return;
|
||
|
|
if (bitcount > bytes * 8)
|
||
|
|
bitcount = bytes * 8;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Bitmap in virtio config space is a simple stream of bytes,
|
||
|
|
* with the first byte carrying bits 0-7, second bits 8-15 and
|
||
|
|
* so on.
|
||
|
|
*/
|
||
|
|
virtio_bits = kzalloc(bytes, GFP_KERNEL);
|
||
|
|
if (!virtio_bits)
|
||
|
|
return;
|
||
|
|
virtio_cread_bytes(vi->vdev, offsetof(struct virtio_input_config,
|
||
|
|
u.bitmap),
|
||
|
|
virtio_bits, bytes);
|
||
|
|
for (bit = 0; bit < bitcount; bit++) {
|
||
|
|
if (virtio_bits[bit / 8] & (1 << (bit % 8)))
|
||
|
|
__set_bit(bit, bits);
|
||
|
|
}
|
||
|
|
kfree(virtio_bits);
|
||
|
|
|
||
|
|
if (select == VIRTIO_INPUT_CFG_EV_BITS)
|
||
|
|
__set_bit(subsel, vi->idev->evbit);
|
||
|
|
}
|
||
|
|
|
||
|
|
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_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 *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);
|
||
|
|
if (err)
|
||
|
|
return err;
|
||
|
|
vi->evt = vqs[0];
|
||
|
|
vi->sts = vqs[1];
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void virtinput_fill_evt(struct virtio_input *vi)
|
||
|
|
{
|
||
|
|
unsigned long flags;
|
||
|
|
int i, size;
|
||
|
|
|
||
|
|
spin_lock_irqsave(&vi->lock, flags);
|
||
|
|
size = virtqueue_get_vring_size(vi->evt);
|
||
|
|
if (size > ARRAY_SIZE(vi->evts))
|
||
|
|
size = ARRAY_SIZE(vi->evts);
|
||
|
|
for (i = 0; i < size; i++)
|
||
|
|
virtinput_queue_evtbuf(vi, &vi->evts[i]);
|
||
|
|
virtqueue_kick(vi->evt);
|
||
|
|
spin_unlock_irqrestore(&vi->lock, flags);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int virtinput_probe(struct virtio_device *vdev)
|
||
|
|
{
|
||
|
|
struct virtio_input *vi;
|
||
|
|
unsigned long flags;
|
||
|
|
size_t size;
|
||
|
|
int abs, err, nslots;
|
||
|
|
|
||
|
|
if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
|
||
|
|
return -ENODEV;
|
||
|
|
|
||
|
|
vi = kzalloc(sizeof(*vi), GFP_KERNEL);
|
||
|
|
if (!vi)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
vdev->priv = vi;
|
||
|
|
vi->vdev = vdev;
|
||
|
|
spin_lock_init(&vi->lock);
|
||
|
|
|
||
|
|
err = virtinput_init_vqs(vi);
|
||
|
|
if (err)
|
||
|
|
goto err_init_vq;
|
||
|
|
|
||
|
|
vi->idev = input_allocate_device();
|
||
|
|
if (!vi->idev) {
|
||
|
|
err = -ENOMEM;
|
||
|
|
goto err_input_alloc;
|
||
|
|
}
|
||
|
|
input_set_drvdata(vi->idev, vi);
|
||
|
|
|
||
|
|
size = virtinput_cfg_select(vi, VIRTIO_INPUT_CFG_ID_NAME, 0);
|
||
|
|
virtio_cread_bytes(vi->vdev, offsetof(struct virtio_input_config,
|
||
|
|
u.string),
|
||
|
|
vi->name, min(size, sizeof(vi->name)));
|
||
|
|
size = virtinput_cfg_select(vi, VIRTIO_INPUT_CFG_ID_SERIAL, 0);
|
||
|
|
virtio_cread_bytes(vi->vdev, offsetof(struct virtio_input_config,
|
||
|
|
u.string),
|
||
|
|
vi->serial, min(size, sizeof(vi->serial)));
|
||
|
|
snprintf(vi->phys, sizeof(vi->phys),
|
||
|
|
"virtio%d/input0", vdev->index);
|
||
|
|
vi->idev->name = vi->name;
|
||
|
|
vi->idev->phys = vi->phys;
|
||
|
|
vi->idev->uniq = vi->serial;
|
||
|
|
|
||
|
|
size = virtinput_cfg_select(vi, VIRTIO_INPUT_CFG_ID_DEVIDS, 0);
|
||
|
|
if (size >= sizeof(struct virtio_input_devids)) {
|
||
|
|
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;
|
||
|
|
}
|
||
|
|
|
||
|
|
virtinput_cfg_bits(vi, VIRTIO_INPUT_CFG_PROP_BITS, 0,
|
||
|
|
vi->idev->propbit, INPUT_PROP_CNT);
|
||
|
|
size = virtinput_cfg_select(vi, VIRTIO_INPUT_CFG_EV_BITS, EV_REP);
|
||
|
|
if (size)
|
||
|
|
__set_bit(EV_REP, vi->idev->evbit);
|
||
|
|
|
||
|
|
vi->idev->dev.parent = &vdev->dev;
|
||
|
|
vi->idev->event = virtinput_status;
|
||
|
|
|
||
|
|
/* device -> kernel */
|
||
|
|
virtinput_cfg_bits(vi, VIRTIO_INPUT_CFG_EV_BITS, EV_KEY,
|
||
|
|
vi->idev->keybit, KEY_CNT);
|
||
|
|
virtinput_cfg_bits(vi, VIRTIO_INPUT_CFG_EV_BITS, EV_REL,
|
||
|
|
vi->idev->relbit, REL_CNT);
|
||
|
|
virtinput_cfg_bits(vi, VIRTIO_INPUT_CFG_EV_BITS, EV_ABS,
|
||
|
|
vi->idev->absbit, ABS_CNT);
|
||
|
|
virtinput_cfg_bits(vi, VIRTIO_INPUT_CFG_EV_BITS, EV_MSC,
|
||
|
|
vi->idev->mscbit, MSC_CNT);
|
||
|
|
virtinput_cfg_bits(vi, VIRTIO_INPUT_CFG_EV_BITS, EV_SW,
|
||
|
|
vi->idev->swbit, SW_CNT);
|
||
|
|
|
||
|
|
/* kernel -> device */
|
||
|
|
virtinput_cfg_bits(vi, VIRTIO_INPUT_CFG_EV_BITS, EV_LED,
|
||
|
|
vi->idev->ledbit, LED_CNT);
|
||
|
|
virtinput_cfg_bits(vi, VIRTIO_INPUT_CFG_EV_BITS, EV_SND,
|
||
|
|
vi->idev->sndbit, SND_CNT);
|
||
|
|
|
||
|
|
if (test_bit(EV_ABS, vi->idev->evbit)) {
|
||
|
|
for (abs = 0; abs < ABS_CNT; abs++) {
|
||
|
|
if (!test_bit(abs, vi->idev->absbit))
|
||
|
|
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);
|
||
|
|
vi->ready = true;
|
||
|
|
err = input_register_device(vi->idev);
|
||
|
|
if (err)
|
||
|
|
goto err_input_register;
|
||
|
|
|
||
|
|
virtinput_fill_evt(vi);
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
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);
|
||
|
|
err_init_vq:
|
||
|
|
kfree(vi);
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void virtinput_remove(struct virtio_device *vdev)
|
||
|
|
{
|
||
|
|
struct virtio_input *vi = vdev->priv;
|
||
|
|
void *buf;
|
||
|
|
unsigned long flags;
|
||
|
|
|
||
|
|
spin_lock_irqsave(&vi->lock, flags);
|
||
|
|
vi->ready = false;
|
||
|
|
spin_unlock_irqrestore(&vi->lock, flags);
|
||
|
|
|
||
|
|
input_unregister_device(vi->idev);
|
||
|
|
virtio_reset_device(vdev);
|
||
|
|
while ((buf = virtqueue_detach_unused_buf(vi->sts)) != NULL)
|
||
|
|
kfree(buf);
|
||
|
|
vdev->config->del_vqs(vdev);
|
||
|
|
kfree(vi);
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifdef CONFIG_PM_SLEEP
|
||
|
|
static int virtinput_freeze(struct virtio_device *vdev)
|
||
|
|
{
|
||
|
|
struct virtio_input *vi = vdev->priv;
|
||
|
|
unsigned long flags;
|
||
|
|
|
||
|
|
spin_lock_irqsave(&vi->lock, flags);
|
||
|
|
vi->ready = false;
|
||
|
|
spin_unlock_irqrestore(&vi->lock, flags);
|
||
|
|
|
||
|
|
vdev->config->del_vqs(vdev);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int virtinput_restore(struct virtio_device *vdev)
|
||
|
|
{
|
||
|
|
struct virtio_input *vi = vdev->priv;
|
||
|
|
int err;
|
||
|
|
|
||
|
|
err = virtinput_init_vqs(vi);
|
||
|
|
if (err)
|
||
|
|
return err;
|
||
|
|
|
||
|
|
virtio_device_ready(vdev);
|
||
|
|
vi->ready = true;
|
||
|
|
virtinput_fill_evt(vi);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
static unsigned int features[] = {
|
||
|
|
/* none */
|
||
|
|
};
|
||
|
|
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,
|
||
|
|
.probe = virtinput_probe,
|
||
|
|
.remove = virtinput_remove,
|
||
|
|
#ifdef CONFIG_PM_SLEEP
|
||
|
|
.freeze = virtinput_freeze,
|
||
|
|
.restore = virtinput_restore,
|
||
|
|
#endif
|
||
|
|
};
|
||
|
|
|
||
|
|
module_virtio_driver(virtio_input_driver);
|
||
|
|
MODULE_DEVICE_TABLE(virtio, id_table);
|
||
|
|
|
||
|
|
MODULE_LICENSE("GPL");
|
||
|
|
MODULE_DESCRIPTION("Virtio input device driver");
|
||
|
|
MODULE_AUTHOR("Gerd Hoffmann <kraxel@redhat.com>");
|