linux/drivers/bluetooth/virtio_bt.c
Marcel Holtmann afd2daa26c Bluetooth: Add support for virtio transport driver
This adds support for Bluetooth HCI transport over virtio.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
2021-04-08 12:26:34 +02:00

402 lines
8.2 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
#include <linux/module.h>
#include <linux/virtio.h>
#include <linux/virtio_config.h>
#include <linux/skbuff.h>
#include <uapi/linux/virtio_ids.h>
#include <uapi/linux/virtio_bt.h>
#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
#define VERSION "0.1"
enum {
VIRTBT_VQ_TX,
VIRTBT_VQ_RX,
VIRTBT_NUM_VQS,
};
struct virtio_bluetooth {
struct virtio_device *vdev;
struct virtqueue *vqs[VIRTBT_NUM_VQS];
struct work_struct rx;
struct hci_dev *hdev;
};
static int virtbt_add_inbuf(struct virtio_bluetooth *vbt)
{
struct virtqueue *vq = vbt->vqs[VIRTBT_VQ_RX];
struct scatterlist sg[1];
struct sk_buff *skb;
int err;
skb = alloc_skb(1000, GFP_KERNEL);
sg_init_one(sg, skb->data, 1000);
err = virtqueue_add_inbuf(vq, sg, 1, skb, GFP_KERNEL);
if (err < 0) {
kfree_skb(skb);
return err;
}
return 0;
}
static int virtbt_open(struct hci_dev *hdev)
{
struct virtio_bluetooth *vbt = hci_get_drvdata(hdev);
if (virtbt_add_inbuf(vbt) < 0)
return -EIO;
virtqueue_kick(vbt->vqs[VIRTBT_VQ_RX]);
return 0;
}
static int virtbt_close(struct hci_dev *hdev)
{
struct virtio_bluetooth *vbt = hci_get_drvdata(hdev);
int i;
cancel_work_sync(&vbt->rx);
for (i = 0; i < ARRAY_SIZE(vbt->vqs); i++) {
struct virtqueue *vq = vbt->vqs[i];
struct sk_buff *skb;
while ((skb = virtqueue_detach_unused_buf(vq)))
kfree_skb(skb);
}
return 0;
}
static int virtbt_flush(struct hci_dev *hdev)
{
return 0;
}
static int virtbt_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
{
struct virtio_bluetooth *vbt = hci_get_drvdata(hdev);
struct scatterlist sg[1];
int err;
memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
sg_init_one(sg, skb->data, skb->len);
err = virtqueue_add_outbuf(vbt->vqs[VIRTBT_VQ_TX], sg, 1, skb,
GFP_KERNEL);
if (err) {
kfree_skb(skb);
return err;
}
virtqueue_kick(vbt->vqs[VIRTBT_VQ_TX]);
return 0;
}
static int virtbt_setup_zephyr(struct hci_dev *hdev)
{
struct sk_buff *skb;
/* Read Build Information */
skb = __hci_cmd_sync(hdev, 0xfc08, 0, NULL, HCI_INIT_TIMEOUT);
if (IS_ERR(skb))
return PTR_ERR(skb);
bt_dev_info(hdev, "%s", (char *)(skb->data + 1));
hci_set_fw_info(hdev, "%s", skb->data + 1);
kfree_skb(skb);
return 0;
}
static int virtbt_set_bdaddr_zephyr(struct hci_dev *hdev,
const bdaddr_t *bdaddr)
{
struct sk_buff *skb;
/* Write BD_ADDR */
skb = __hci_cmd_sync(hdev, 0xfc06, 6, bdaddr, HCI_INIT_TIMEOUT);
if (IS_ERR(skb))
return PTR_ERR(skb);
kfree_skb(skb);
return 0;
}
static int virtbt_setup_intel(struct hci_dev *hdev)
{
struct sk_buff *skb;
/* Intel Read Version */
skb = __hci_cmd_sync(hdev, 0xfc05, 0, NULL, HCI_CMD_TIMEOUT);
if (IS_ERR(skb))
return PTR_ERR(skb);
kfree_skb(skb);
return 0;
}
static int virtbt_set_bdaddr_intel(struct hci_dev *hdev, const bdaddr_t *bdaddr)
{
struct sk_buff *skb;
/* Intel Write BD Address */
skb = __hci_cmd_sync(hdev, 0xfc31, 6, bdaddr, HCI_INIT_TIMEOUT);
if (IS_ERR(skb))
return PTR_ERR(skb);
kfree_skb(skb);
return 0;
}
static int virtbt_setup_realtek(struct hci_dev *hdev)
{
struct sk_buff *skb;
/* Read ROM Version */
skb = __hci_cmd_sync(hdev, 0xfc6d, 0, NULL, HCI_INIT_TIMEOUT);
if (IS_ERR(skb))
return PTR_ERR(skb);
bt_dev_info(hdev, "ROM version %u", *((__u8 *) (skb->data + 1)));
kfree_skb(skb);
return 0;
}
static int virtbt_shutdown_generic(struct hci_dev *hdev)
{
struct sk_buff *skb;
/* Reset */
skb = __hci_cmd_sync(hdev, HCI_OP_RESET, 0, NULL, HCI_INIT_TIMEOUT);
if (IS_ERR(skb))
return PTR_ERR(skb);
kfree_skb(skb);
return 0;
}
static void virtbt_rx_handle(struct virtio_bluetooth *vbt, struct sk_buff *skb)
{
__u8 pkt_type;
pkt_type = *((__u8 *) skb->data);
skb_pull(skb, 1);
switch (pkt_type) {
case HCI_EVENT_PKT:
case HCI_ACLDATA_PKT:
case HCI_SCODATA_PKT:
case HCI_ISODATA_PKT:
hci_skb_pkt_type(skb) = pkt_type;
hci_recv_frame(vbt->hdev, skb);
break;
}
}
static void virtbt_rx_work(struct work_struct *work)
{
struct virtio_bluetooth *vbt = container_of(work,
struct virtio_bluetooth, rx);
struct sk_buff *skb;
unsigned int len;
skb = virtqueue_get_buf(vbt->vqs[VIRTBT_VQ_RX], &len);
if (!skb)
return;
skb->len = len;
virtbt_rx_handle(vbt, skb);
if (virtbt_add_inbuf(vbt) < 0)
return;
virtqueue_kick(vbt->vqs[VIRTBT_VQ_RX]);
}
static void virtbt_tx_done(struct virtqueue *vq)
{
struct sk_buff *skb;
unsigned int len;
while ((skb = virtqueue_get_buf(vq, &len)))
kfree_skb(skb);
}
static void virtbt_rx_done(struct virtqueue *vq)
{
struct virtio_bluetooth *vbt = vq->vdev->priv;
schedule_work(&vbt->rx);
}
static int virtbt_probe(struct virtio_device *vdev)
{
vq_callback_t *callbacks[VIRTBT_NUM_VQS] = {
[VIRTBT_VQ_TX] = virtbt_tx_done,
[VIRTBT_VQ_RX] = virtbt_rx_done,
};
const char *names[VIRTBT_NUM_VQS] = {
[VIRTBT_VQ_TX] = "tx",
[VIRTBT_VQ_RX] = "rx",
};
struct virtio_bluetooth *vbt;
struct hci_dev *hdev;
int err;
__u8 type;
if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
return -ENODEV;
type = virtio_cread8(vdev, offsetof(struct virtio_bt_config, type));
switch (type) {
case VIRTIO_BT_CONFIG_TYPE_PRIMARY:
case VIRTIO_BT_CONFIG_TYPE_AMP:
break;
default:
return -EINVAL;
}
vbt = kzalloc(sizeof(*vbt), GFP_KERNEL);
if (!vbt)
return -ENOMEM;
vdev->priv = vbt;
vbt->vdev = vdev;
INIT_WORK(&vbt->rx, virtbt_rx_work);
err = virtio_find_vqs(vdev, VIRTBT_NUM_VQS, vbt->vqs, callbacks,
names, NULL);
if (err)
return err;
hdev = hci_alloc_dev();
if (!hdev) {
err = -ENOMEM;
goto failed;
}
vbt->hdev = hdev;
hdev->bus = HCI_VIRTIO;
hdev->dev_type = type;
hci_set_drvdata(hdev, vbt);
hdev->open = virtbt_open;
hdev->close = virtbt_close;
hdev->flush = virtbt_flush;
hdev->send = virtbt_send_frame;
if (virtio_has_feature(vdev, VIRTIO_BT_F_VND_HCI)) {
__u16 vendor;
virtio_cread(vdev, struct virtio_bt_config, vendor, &vendor);
switch (vendor) {
case VIRTIO_BT_CONFIG_VENDOR_ZEPHYR:
hdev->manufacturer = 1521;
hdev->setup = virtbt_setup_zephyr;
hdev->shutdown = virtbt_shutdown_generic;
hdev->set_bdaddr = virtbt_set_bdaddr_zephyr;
break;
case VIRTIO_BT_CONFIG_VENDOR_INTEL:
hdev->manufacturer = 2;
hdev->setup = virtbt_setup_intel;
hdev->shutdown = virtbt_shutdown_generic;
hdev->set_bdaddr = virtbt_set_bdaddr_intel;
set_bit(HCI_QUIRK_STRICT_DUPLICATE_FILTER, &hdev->quirks);
set_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &hdev->quirks);
set_bit(HCI_QUIRK_WIDEBAND_SPEECH_SUPPORTED, &hdev->quirks);
break;
case VIRTIO_BT_CONFIG_VENDOR_REALTEK:
hdev->manufacturer = 93;
hdev->setup = virtbt_setup_realtek;
hdev->shutdown = virtbt_shutdown_generic;
set_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &hdev->quirks);
set_bit(HCI_QUIRK_WIDEBAND_SPEECH_SUPPORTED, &hdev->quirks);
break;
}
}
if (virtio_has_feature(vdev, VIRTIO_BT_F_MSFT_EXT)) {
__u16 msft_opcode;
virtio_cread(vdev, struct virtio_bt_config,
msft_opcode, &msft_opcode);
hci_set_msft_opcode(hdev, msft_opcode);
}
if (virtio_has_feature(vdev, VIRTIO_BT_F_AOSP_EXT))
hci_set_aosp_capable(hdev);
if (hci_register_dev(hdev) < 0) {
hci_free_dev(hdev);
err = -EBUSY;
goto failed;
}
return 0;
failed:
vdev->config->del_vqs(vdev);
return err;
}
static void virtbt_remove(struct virtio_device *vdev)
{
struct virtio_bluetooth *vbt = vdev->priv;
struct hci_dev *hdev = vbt->hdev;
hci_unregister_dev(hdev);
vdev->config->reset(vdev);
hci_free_dev(hdev);
vbt->hdev = NULL;
vdev->config->del_vqs(vdev);
kfree(vbt);
}
static struct virtio_device_id virtbt_table[] = {
{ VIRTIO_ID_BT, VIRTIO_DEV_ANY_ID },
{ 0 },
};
MODULE_DEVICE_TABLE(virtio, virtbt_table);
static const unsigned int virtbt_features[] = {
VIRTIO_BT_F_VND_HCI,
VIRTIO_BT_F_MSFT_EXT,
VIRTIO_BT_F_AOSP_EXT,
};
static struct virtio_driver virtbt_driver = {
.driver.name = KBUILD_MODNAME,
.driver.owner = THIS_MODULE,
.feature_table = virtbt_features,
.feature_table_size = ARRAY_SIZE(virtbt_features),
.id_table = virtbt_table,
.probe = virtbt_probe,
.remove = virtbt_remove,
};
module_virtio_driver(virtbt_driver);
MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
MODULE_DESCRIPTION("Generic Bluetooth VIRTIO driver ver " VERSION);
MODULE_VERSION(VERSION);
MODULE_LICENSE("GPL");