mirror of
https://github.com/torvalds/linux.git
synced 2025-11-04 02:30:34 +02:00
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>
This commit is contained in:
Marcel Holtmann
parent
f67743f9e0
commit
afd2daa26c
5 changed files with 445 additions and 0 deletions
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@ -425,4 +425,14 @@ config BT_HCIRSI
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Say Y here to compile support for HCI over Redpine into the
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kernel or say M to compile as a module.
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config BT_VIRTIO
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tristate "Virtio Bluetooth driver"
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depends on VIRTIO
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help
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Virtio Bluetooth support driver.
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This driver supports Virtio Bluetooth devices.
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Say Y here to compile support for HCI over Virtio into the
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kernel or say M to compile as a module.
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endmenu
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@ -26,6 +26,8 @@ obj-$(CONFIG_BT_BCM) += btbcm.o
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obj-$(CONFIG_BT_RTL) += btrtl.o
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obj-$(CONFIG_BT_QCA) += btqca.o
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obj-$(CONFIG_BT_VIRTIO) += virtio_bt.o
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obj-$(CONFIG_BT_HCIUART_NOKIA) += hci_nokia.o
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obj-$(CONFIG_BT_HCIRSI) += btrsi.o
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401
drivers/bluetooth/virtio_bt.c
Normal file
401
drivers/bluetooth/virtio_bt.c
Normal file
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@ -0,0 +1,401 @@
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// 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/skbuff.h>
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#include <uapi/linux/virtio_ids.h>
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#include <uapi/linux/virtio_bt.h>
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#include <net/bluetooth/bluetooth.h>
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#include <net/bluetooth/hci_core.h>
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#define VERSION "0.1"
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enum {
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VIRTBT_VQ_TX,
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VIRTBT_VQ_RX,
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VIRTBT_NUM_VQS,
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};
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struct virtio_bluetooth {
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struct virtio_device *vdev;
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struct virtqueue *vqs[VIRTBT_NUM_VQS];
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struct work_struct rx;
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struct hci_dev *hdev;
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};
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static int virtbt_add_inbuf(struct virtio_bluetooth *vbt)
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{
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struct virtqueue *vq = vbt->vqs[VIRTBT_VQ_RX];
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struct scatterlist sg[1];
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struct sk_buff *skb;
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int err;
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skb = alloc_skb(1000, GFP_KERNEL);
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sg_init_one(sg, skb->data, 1000);
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err = virtqueue_add_inbuf(vq, sg, 1, skb, GFP_KERNEL);
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if (err < 0) {
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kfree_skb(skb);
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return err;
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}
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return 0;
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}
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static int virtbt_open(struct hci_dev *hdev)
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{
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struct virtio_bluetooth *vbt = hci_get_drvdata(hdev);
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if (virtbt_add_inbuf(vbt) < 0)
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return -EIO;
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virtqueue_kick(vbt->vqs[VIRTBT_VQ_RX]);
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return 0;
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}
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static int virtbt_close(struct hci_dev *hdev)
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{
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struct virtio_bluetooth *vbt = hci_get_drvdata(hdev);
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int i;
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cancel_work_sync(&vbt->rx);
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for (i = 0; i < ARRAY_SIZE(vbt->vqs); i++) {
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struct virtqueue *vq = vbt->vqs[i];
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struct sk_buff *skb;
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while ((skb = virtqueue_detach_unused_buf(vq)))
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kfree_skb(skb);
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}
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return 0;
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}
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static int virtbt_flush(struct hci_dev *hdev)
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{
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return 0;
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}
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static int virtbt_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
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{
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struct virtio_bluetooth *vbt = hci_get_drvdata(hdev);
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struct scatterlist sg[1];
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int err;
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memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
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sg_init_one(sg, skb->data, skb->len);
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err = virtqueue_add_outbuf(vbt->vqs[VIRTBT_VQ_TX], sg, 1, skb,
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GFP_KERNEL);
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if (err) {
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kfree_skb(skb);
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return err;
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}
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virtqueue_kick(vbt->vqs[VIRTBT_VQ_TX]);
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return 0;
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}
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static int virtbt_setup_zephyr(struct hci_dev *hdev)
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{
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struct sk_buff *skb;
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/* Read Build Information */
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skb = __hci_cmd_sync(hdev, 0xfc08, 0, NULL, HCI_INIT_TIMEOUT);
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if (IS_ERR(skb))
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return PTR_ERR(skb);
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bt_dev_info(hdev, "%s", (char *)(skb->data + 1));
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hci_set_fw_info(hdev, "%s", skb->data + 1);
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kfree_skb(skb);
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return 0;
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}
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static int virtbt_set_bdaddr_zephyr(struct hci_dev *hdev,
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const bdaddr_t *bdaddr)
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{
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struct sk_buff *skb;
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/* Write BD_ADDR */
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skb = __hci_cmd_sync(hdev, 0xfc06, 6, bdaddr, HCI_INIT_TIMEOUT);
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if (IS_ERR(skb))
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return PTR_ERR(skb);
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kfree_skb(skb);
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return 0;
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}
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static int virtbt_setup_intel(struct hci_dev *hdev)
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{
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struct sk_buff *skb;
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/* Intel Read Version */
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skb = __hci_cmd_sync(hdev, 0xfc05, 0, NULL, HCI_CMD_TIMEOUT);
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if (IS_ERR(skb))
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return PTR_ERR(skb);
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kfree_skb(skb);
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return 0;
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}
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static int virtbt_set_bdaddr_intel(struct hci_dev *hdev, const bdaddr_t *bdaddr)
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{
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struct sk_buff *skb;
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/* Intel Write BD Address */
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skb = __hci_cmd_sync(hdev, 0xfc31, 6, bdaddr, HCI_INIT_TIMEOUT);
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if (IS_ERR(skb))
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return PTR_ERR(skb);
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kfree_skb(skb);
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return 0;
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}
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static int virtbt_setup_realtek(struct hci_dev *hdev)
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{
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struct sk_buff *skb;
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/* Read ROM Version */
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skb = __hci_cmd_sync(hdev, 0xfc6d, 0, NULL, HCI_INIT_TIMEOUT);
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if (IS_ERR(skb))
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return PTR_ERR(skb);
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bt_dev_info(hdev, "ROM version %u", *((__u8 *) (skb->data + 1)));
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kfree_skb(skb);
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return 0;
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}
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static int virtbt_shutdown_generic(struct hci_dev *hdev)
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{
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struct sk_buff *skb;
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/* Reset */
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skb = __hci_cmd_sync(hdev, HCI_OP_RESET, 0, NULL, HCI_INIT_TIMEOUT);
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if (IS_ERR(skb))
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return PTR_ERR(skb);
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kfree_skb(skb);
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return 0;
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}
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static void virtbt_rx_handle(struct virtio_bluetooth *vbt, struct sk_buff *skb)
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{
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__u8 pkt_type;
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pkt_type = *((__u8 *) skb->data);
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skb_pull(skb, 1);
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switch (pkt_type) {
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case HCI_EVENT_PKT:
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case HCI_ACLDATA_PKT:
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case HCI_SCODATA_PKT:
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case HCI_ISODATA_PKT:
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hci_skb_pkt_type(skb) = pkt_type;
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hci_recv_frame(vbt->hdev, skb);
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break;
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}
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}
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static void virtbt_rx_work(struct work_struct *work)
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{
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struct virtio_bluetooth *vbt = container_of(work,
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struct virtio_bluetooth, rx);
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struct sk_buff *skb;
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unsigned int len;
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skb = virtqueue_get_buf(vbt->vqs[VIRTBT_VQ_RX], &len);
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if (!skb)
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return;
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skb->len = len;
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virtbt_rx_handle(vbt, skb);
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if (virtbt_add_inbuf(vbt) < 0)
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return;
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virtqueue_kick(vbt->vqs[VIRTBT_VQ_RX]);
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}
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static void virtbt_tx_done(struct virtqueue *vq)
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{
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struct sk_buff *skb;
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unsigned int len;
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while ((skb = virtqueue_get_buf(vq, &len)))
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kfree_skb(skb);
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}
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static void virtbt_rx_done(struct virtqueue *vq)
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{
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struct virtio_bluetooth *vbt = vq->vdev->priv;
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schedule_work(&vbt->rx);
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}
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static int virtbt_probe(struct virtio_device *vdev)
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{
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vq_callback_t *callbacks[VIRTBT_NUM_VQS] = {
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[VIRTBT_VQ_TX] = virtbt_tx_done,
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[VIRTBT_VQ_RX] = virtbt_rx_done,
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};
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const char *names[VIRTBT_NUM_VQS] = {
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[VIRTBT_VQ_TX] = "tx",
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[VIRTBT_VQ_RX] = "rx",
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};
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struct virtio_bluetooth *vbt;
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struct hci_dev *hdev;
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int err;
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__u8 type;
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if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
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return -ENODEV;
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type = virtio_cread8(vdev, offsetof(struct virtio_bt_config, type));
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switch (type) {
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case VIRTIO_BT_CONFIG_TYPE_PRIMARY:
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case VIRTIO_BT_CONFIG_TYPE_AMP:
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break;
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default:
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return -EINVAL;
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}
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vbt = kzalloc(sizeof(*vbt), GFP_KERNEL);
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if (!vbt)
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return -ENOMEM;
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vdev->priv = vbt;
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vbt->vdev = vdev;
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INIT_WORK(&vbt->rx, virtbt_rx_work);
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err = virtio_find_vqs(vdev, VIRTBT_NUM_VQS, vbt->vqs, callbacks,
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names, NULL);
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if (err)
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return err;
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hdev = hci_alloc_dev();
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if (!hdev) {
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err = -ENOMEM;
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goto failed;
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}
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vbt->hdev = hdev;
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hdev->bus = HCI_VIRTIO;
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hdev->dev_type = type;
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hci_set_drvdata(hdev, vbt);
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hdev->open = virtbt_open;
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hdev->close = virtbt_close;
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hdev->flush = virtbt_flush;
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hdev->send = virtbt_send_frame;
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if (virtio_has_feature(vdev, VIRTIO_BT_F_VND_HCI)) {
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__u16 vendor;
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virtio_cread(vdev, struct virtio_bt_config, vendor, &vendor);
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switch (vendor) {
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case VIRTIO_BT_CONFIG_VENDOR_ZEPHYR:
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hdev->manufacturer = 1521;
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hdev->setup = virtbt_setup_zephyr;
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hdev->shutdown = virtbt_shutdown_generic;
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hdev->set_bdaddr = virtbt_set_bdaddr_zephyr;
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break;
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case VIRTIO_BT_CONFIG_VENDOR_INTEL:
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hdev->manufacturer = 2;
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hdev->setup = virtbt_setup_intel;
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hdev->shutdown = virtbt_shutdown_generic;
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hdev->set_bdaddr = virtbt_set_bdaddr_intel;
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set_bit(HCI_QUIRK_STRICT_DUPLICATE_FILTER, &hdev->quirks);
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set_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &hdev->quirks);
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set_bit(HCI_QUIRK_WIDEBAND_SPEECH_SUPPORTED, &hdev->quirks);
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break;
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case VIRTIO_BT_CONFIG_VENDOR_REALTEK:
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hdev->manufacturer = 93;
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hdev->setup = virtbt_setup_realtek;
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hdev->shutdown = virtbt_shutdown_generic;
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set_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &hdev->quirks);
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set_bit(HCI_QUIRK_WIDEBAND_SPEECH_SUPPORTED, &hdev->quirks);
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break;
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}
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}
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if (virtio_has_feature(vdev, VIRTIO_BT_F_MSFT_EXT)) {
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__u16 msft_opcode;
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virtio_cread(vdev, struct virtio_bt_config,
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msft_opcode, &msft_opcode);
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hci_set_msft_opcode(hdev, msft_opcode);
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}
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if (virtio_has_feature(vdev, VIRTIO_BT_F_AOSP_EXT))
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hci_set_aosp_capable(hdev);
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if (hci_register_dev(hdev) < 0) {
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hci_free_dev(hdev);
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err = -EBUSY;
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goto failed;
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}
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return 0;
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failed:
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vdev->config->del_vqs(vdev);
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return err;
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}
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static void virtbt_remove(struct virtio_device *vdev)
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{
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struct virtio_bluetooth *vbt = vdev->priv;
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struct hci_dev *hdev = vbt->hdev;
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hci_unregister_dev(hdev);
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vdev->config->reset(vdev);
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hci_free_dev(hdev);
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vbt->hdev = NULL;
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vdev->config->del_vqs(vdev);
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kfree(vbt);
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}
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static struct virtio_device_id virtbt_table[] = {
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{ VIRTIO_ID_BT, VIRTIO_DEV_ANY_ID },
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{ 0 },
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};
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MODULE_DEVICE_TABLE(virtio, virtbt_table);
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static const unsigned int virtbt_features[] = {
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VIRTIO_BT_F_VND_HCI,
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VIRTIO_BT_F_MSFT_EXT,
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VIRTIO_BT_F_AOSP_EXT,
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};
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static struct virtio_driver virtbt_driver = {
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.driver.name = KBUILD_MODNAME,
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.driver.owner = THIS_MODULE,
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.feature_table = virtbt_features,
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.feature_table_size = ARRAY_SIZE(virtbt_features),
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.id_table = virtbt_table,
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.probe = virtbt_probe,
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.remove = virtbt_remove,
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};
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module_virtio_driver(virtbt_driver);
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MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
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MODULE_DESCRIPTION("Generic Bluetooth VIRTIO driver ver " VERSION);
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MODULE_VERSION(VERSION);
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MODULE_LICENSE("GPL");
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31
include/uapi/linux/virtio_bt.h
Normal file
31
include/uapi/linux/virtio_bt.h
Normal file
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@ -0,0 +1,31 @@
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/* SPDX-License-Identifier: BSD-3-Clause */
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#ifndef _UAPI_LINUX_VIRTIO_BT_H
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#define _UAPI_LINUX_VIRTIO_BT_H
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#include <linux/virtio_types.h>
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/* Feature bits */
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#define VIRTIO_BT_F_VND_HCI 0 /* Indicates vendor command support */
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#define VIRTIO_BT_F_MSFT_EXT 1 /* Indicates MSFT vendor support */
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#define VIRTIO_BT_F_AOSP_EXT 2 /* Indicates AOSP vendor support */
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enum virtio_bt_config_type {
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VIRTIO_BT_CONFIG_TYPE_PRIMARY = 0,
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VIRTIO_BT_CONFIG_TYPE_AMP = 1,
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};
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enum virtio_bt_config_vendor {
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VIRTIO_BT_CONFIG_VENDOR_NONE = 0,
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VIRTIO_BT_CONFIG_VENDOR_ZEPHYR = 1,
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VIRTIO_BT_CONFIG_VENDOR_INTEL = 2,
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VIRTIO_BT_CONFIG_VENDOR_REALTEK = 3,
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};
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struct virtio_bt_config {
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__u8 type;
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__u16 vendor;
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__u16 msft_opcode;
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} __attribute__((packed));
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#endif /* _UAPI_LINUX_VIRTIO_BT_H */
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@ -53,6 +53,7 @@
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#define VIRTIO_ID_MEM 24 /* virtio mem */
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#define VIRTIO_ID_FS 26 /* virtio filesystem */
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#define VIRTIO_ID_PMEM 27 /* virtio pmem */
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#define VIRTIO_ID_BT 28 /* virtio bluetooth */
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#define VIRTIO_ID_MAC80211_HWSIM 29 /* virtio mac80211-hwsim */
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#endif /* _LINUX_VIRTIO_IDS_H */
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