390 lines
10 KiB
C
390 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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#include <linux/module.h>
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#include <linux/virtio.h>
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#include <linux/virtio_config.h>
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#include <linux/input.h>
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#include <uapi/linux/virtio_ids.h>
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#include <uapi/linux/virtio_input.h>
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struct virtio_input {
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struct virtio_device *vdev;
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struct input_dev *idev;
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char name[64];
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char serial[64];
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char phys[64];
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struct virtqueue *evt, *sts;
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struct virtio_input_event evts[64];
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spinlock_t lock;
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bool ready;
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};
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static void virtinput_queue_evtbuf(struct virtio_input *vi,
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struct virtio_input_event *evtbuf)
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{
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struct scatterlist sg[1];
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sg_init_one(sg, evtbuf, sizeof(*evtbuf));
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virtqueue_add_inbuf(vi->evt, sg, 1, evtbuf, GFP_ATOMIC);
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}
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static void virtinput_recv_events(struct virtqueue *vq)
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{
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struct virtio_input *vi = vq->vdev->priv;
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struct virtio_input_event *event;
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unsigned long flags;
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unsigned int len;
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spin_lock_irqsave(&vi->lock, flags);
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if (vi->ready) {
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while ((event = virtqueue_get_buf(vi->evt, &len)) != NULL) {
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spin_unlock_irqrestore(&vi->lock, flags);
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input_event(vi->idev,
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le16_to_cpu(event->type),
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le16_to_cpu(event->code),
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le32_to_cpu(event->value));
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spin_lock_irqsave(&vi->lock, flags);
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virtinput_queue_evtbuf(vi, event);
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}
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virtqueue_kick(vq);
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}
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spin_unlock_irqrestore(&vi->lock, flags);
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}
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/*
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* On error we are losing the status update, which isn't critical as
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* this is typically used for stuff like keyboard leds.
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*/
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static int virtinput_send_status(struct virtio_input *vi,
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u16 type, u16 code, s32 value)
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{
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struct virtio_input_event *stsbuf;
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struct scatterlist sg[1];
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unsigned long flags;
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int rc;
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stsbuf = kzalloc(sizeof(*stsbuf), GFP_ATOMIC);
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if (!stsbuf)
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return -ENOMEM;
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stsbuf->type = cpu_to_le16(type);
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stsbuf->code = cpu_to_le16(code);
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stsbuf->value = cpu_to_le32(value);
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sg_init_one(sg, stsbuf, sizeof(*stsbuf));
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spin_lock_irqsave(&vi->lock, flags);
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if (vi->ready) {
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rc = virtqueue_add_outbuf(vi->sts, sg, 1, stsbuf, GFP_ATOMIC);
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virtqueue_kick(vi->sts);
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} else {
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rc = -ENODEV;
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}
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spin_unlock_irqrestore(&vi->lock, flags);
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if (rc != 0)
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kfree(stsbuf);
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return rc;
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}
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static void virtinput_recv_status(struct virtqueue *vq)
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{
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struct virtio_input *vi = vq->vdev->priv;
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struct virtio_input_event *stsbuf;
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unsigned long flags;
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unsigned int len;
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spin_lock_irqsave(&vi->lock, flags);
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while ((stsbuf = virtqueue_get_buf(vi->sts, &len)) != NULL)
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kfree(stsbuf);
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spin_unlock_irqrestore(&vi->lock, flags);
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}
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static int virtinput_status(struct input_dev *idev, unsigned int type,
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unsigned int code, int value)
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{
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struct virtio_input *vi = input_get_drvdata(idev);
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return virtinput_send_status(vi, type, code, value);
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}
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static u8 virtinput_cfg_select(struct virtio_input *vi,
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u8 select, u8 subsel)
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{
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u8 size;
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virtio_cwrite(vi->vdev, struct virtio_input_config, select, &select);
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virtio_cwrite(vi->vdev, struct virtio_input_config, subsel, &subsel);
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virtio_cread(vi->vdev, struct virtio_input_config, size, &size);
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return size;
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}
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static void virtinput_cfg_bits(struct virtio_input *vi, int select, int subsel,
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unsigned long *bits, unsigned int bitcount)
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{
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unsigned int bit;
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u8 *virtio_bits;
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u8 bytes;
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bytes = virtinput_cfg_select(vi, select, subsel);
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if (!bytes)
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return;
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if (bitcount > bytes * 8)
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bitcount = bytes * 8;
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/*
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* Bitmap in virtio config space is a simple stream of bytes,
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* with the first byte carrying bits 0-7, second bits 8-15 and
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* so on.
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*/
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virtio_bits = kzalloc(bytes, GFP_KERNEL);
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if (!virtio_bits)
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return;
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virtio_cread_bytes(vi->vdev, offsetof(struct virtio_input_config,
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u.bitmap),
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virtio_bits, bytes);
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for (bit = 0; bit < bitcount; bit++) {
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if (virtio_bits[bit / 8] & (1 << (bit % 8)))
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__set_bit(bit, bits);
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}
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kfree(virtio_bits);
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if (select == VIRTIO_INPUT_CFG_EV_BITS)
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__set_bit(subsel, vi->idev->evbit);
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}
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static void virtinput_cfg_abs(struct virtio_input *vi, int abs)
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{
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u32 mi, ma, re, fu, fl;
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virtinput_cfg_select(vi, VIRTIO_INPUT_CFG_ABS_INFO, abs);
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virtio_cread(vi->vdev, struct virtio_input_config, u.abs.min, &mi);
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virtio_cread(vi->vdev, struct virtio_input_config, u.abs.max, &ma);
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virtio_cread(vi->vdev, struct virtio_input_config, u.abs.res, &re);
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virtio_cread(vi->vdev, struct virtio_input_config, u.abs.fuzz, &fu);
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virtio_cread(vi->vdev, struct virtio_input_config, u.abs.flat, &fl);
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input_set_abs_params(vi->idev, abs, mi, ma, fu, fl);
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input_abs_set_res(vi->idev, abs, re);
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}
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static int virtinput_init_vqs(struct virtio_input *vi)
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{
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struct virtqueue *vqs[2];
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vq_callback_t *cbs[] = { virtinput_recv_events,
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virtinput_recv_status };
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static const char * const names[] = { "events", "status" };
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int err;
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err = virtio_find_vqs(vi->vdev, 2, vqs, cbs, names, NULL);
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if (err)
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return err;
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vi->evt = vqs[0];
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vi->sts = vqs[1];
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return 0;
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}
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static void virtinput_fill_evt(struct virtio_input *vi)
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{
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unsigned long flags;
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int i, size;
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spin_lock_irqsave(&vi->lock, flags);
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size = virtqueue_get_vring_size(vi->evt);
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if (size > ARRAY_SIZE(vi->evts))
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size = ARRAY_SIZE(vi->evts);
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for (i = 0; i < size; i++)
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virtinput_queue_evtbuf(vi, &vi->evts[i]);
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virtqueue_kick(vi->evt);
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spin_unlock_irqrestore(&vi->lock, flags);
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}
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static int virtinput_probe(struct virtio_device *vdev)
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{
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struct virtio_input *vi;
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unsigned long flags;
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size_t size;
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int abs, err;
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if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
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return -ENODEV;
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vi = kzalloc(sizeof(*vi), GFP_KERNEL);
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if (!vi)
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return -ENOMEM;
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vdev->priv = vi;
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vi->vdev = vdev;
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spin_lock_init(&vi->lock);
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err = virtinput_init_vqs(vi);
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if (err)
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goto err_init_vq;
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vi->idev = input_allocate_device();
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if (!vi->idev) {
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err = -ENOMEM;
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goto err_input_alloc;
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}
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input_set_drvdata(vi->idev, vi);
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size = virtinput_cfg_select(vi, VIRTIO_INPUT_CFG_ID_NAME, 0);
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virtio_cread_bytes(vi->vdev, offsetof(struct virtio_input_config,
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u.string),
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vi->name, min(size, sizeof(vi->name)));
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size = virtinput_cfg_select(vi, VIRTIO_INPUT_CFG_ID_SERIAL, 0);
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virtio_cread_bytes(vi->vdev, offsetof(struct virtio_input_config,
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u.string),
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vi->serial, min(size, sizeof(vi->serial)));
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snprintf(vi->phys, sizeof(vi->phys),
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"virtio%d/input0", vdev->index);
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vi->idev->name = vi->name;
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vi->idev->phys = vi->phys;
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vi->idev->uniq = vi->serial;
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size = virtinput_cfg_select(vi, VIRTIO_INPUT_CFG_ID_DEVIDS, 0);
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if (size >= sizeof(struct virtio_input_devids)) {
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virtio_cread(vi->vdev, struct virtio_input_config,
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u.ids.bustype, &vi->idev->id.bustype);
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virtio_cread(vi->vdev, struct virtio_input_config,
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u.ids.vendor, &vi->idev->id.vendor);
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virtio_cread(vi->vdev, struct virtio_input_config,
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u.ids.product, &vi->idev->id.product);
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virtio_cread(vi->vdev, struct virtio_input_config,
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u.ids.version, &vi->idev->id.version);
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} else {
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vi->idev->id.bustype = BUS_VIRTUAL;
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}
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virtinput_cfg_bits(vi, VIRTIO_INPUT_CFG_PROP_BITS, 0,
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vi->idev->propbit, INPUT_PROP_CNT);
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size = virtinput_cfg_select(vi, VIRTIO_INPUT_CFG_EV_BITS, EV_REP);
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if (size)
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__set_bit(EV_REP, vi->idev->evbit);
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vi->idev->dev.parent = &vdev->dev;
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vi->idev->event = virtinput_status;
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/* device -> kernel */
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virtinput_cfg_bits(vi, VIRTIO_INPUT_CFG_EV_BITS, EV_KEY,
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vi->idev->keybit, KEY_CNT);
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virtinput_cfg_bits(vi, VIRTIO_INPUT_CFG_EV_BITS, EV_REL,
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vi->idev->relbit, REL_CNT);
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virtinput_cfg_bits(vi, VIRTIO_INPUT_CFG_EV_BITS, EV_ABS,
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vi->idev->absbit, ABS_CNT);
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virtinput_cfg_bits(vi, VIRTIO_INPUT_CFG_EV_BITS, EV_MSC,
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vi->idev->mscbit, MSC_CNT);
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virtinput_cfg_bits(vi, VIRTIO_INPUT_CFG_EV_BITS, EV_SW,
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vi->idev->swbit, SW_CNT);
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/* kernel -> device */
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virtinput_cfg_bits(vi, VIRTIO_INPUT_CFG_EV_BITS, EV_LED,
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vi->idev->ledbit, LED_CNT);
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virtinput_cfg_bits(vi, VIRTIO_INPUT_CFG_EV_BITS, EV_SND,
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vi->idev->sndbit, SND_CNT);
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if (test_bit(EV_ABS, vi->idev->evbit)) {
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for (abs = 0; abs < ABS_CNT; abs++) {
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if (!test_bit(abs, vi->idev->absbit))
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continue;
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virtinput_cfg_abs(vi, abs);
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}
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}
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virtio_device_ready(vdev);
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vi->ready = true;
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err = input_register_device(vi->idev);
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if (err)
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goto err_input_register;
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virtinput_fill_evt(vi);
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return 0;
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err_input_register:
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spin_lock_irqsave(&vi->lock, flags);
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vi->ready = false;
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spin_unlock_irqrestore(&vi->lock, flags);
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input_free_device(vi->idev);
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err_input_alloc:
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vdev->config->del_vqs(vdev);
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err_init_vq:
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kfree(vi);
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return err;
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}
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static void virtinput_remove(struct virtio_device *vdev)
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{
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struct virtio_input *vi = vdev->priv;
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void *buf;
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unsigned long flags;
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spin_lock_irqsave(&vi->lock, flags);
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vi->ready = false;
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spin_unlock_irqrestore(&vi->lock, flags);
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input_unregister_device(vi->idev);
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vdev->config->reset(vdev);
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while ((buf = virtqueue_detach_unused_buf(vi->sts)) != NULL)
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kfree(buf);
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vdev->config->del_vqs(vdev);
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kfree(vi);
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}
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#ifdef CONFIG_PM_SLEEP
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static int virtinput_freeze(struct virtio_device *vdev)
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{
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struct virtio_input *vi = vdev->priv;
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unsigned long flags;
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spin_lock_irqsave(&vi->lock, flags);
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vi->ready = false;
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spin_unlock_irqrestore(&vi->lock, flags);
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vdev->config->del_vqs(vdev);
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return 0;
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}
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static int virtinput_restore(struct virtio_device *vdev)
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{
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struct virtio_input *vi = vdev->priv;
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int err;
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err = virtinput_init_vqs(vi);
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if (err)
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return err;
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virtio_device_ready(vdev);
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vi->ready = true;
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virtinput_fill_evt(vi);
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return 0;
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}
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#endif
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static unsigned int features[] = {
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/* none */
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};
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static struct virtio_device_id id_table[] = {
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{ VIRTIO_ID_INPUT, VIRTIO_DEV_ANY_ID },
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{ 0 },
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};
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static struct virtio_driver virtio_input_driver = {
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.driver.name = KBUILD_MODNAME,
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.driver.owner = THIS_MODULE,
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.feature_table = features,
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.feature_table_size = ARRAY_SIZE(features),
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.id_table = id_table,
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.probe = virtinput_probe,
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.remove = virtinput_remove,
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#ifdef CONFIG_PM_SLEEP
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.freeze = virtinput_freeze,
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.restore = virtinput_restore,
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#endif
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};
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module_virtio_driver(virtio_input_driver);
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MODULE_DEVICE_TABLE(virtio, id_table);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Virtio input device driver");
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MODULE_AUTHOR("Gerd Hoffmann <kraxel@redhat.com>");
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