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404 lines
8.3 KiB
404 lines
8.3 KiB
// 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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if (!skb) |
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return -ENOMEM; |
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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 <[email protected]>"); |
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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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