1 // SPDX-License-Identifier: GPL-2.0-only
3 #include <linux/module.h>
4 #include <linux/virtio.h>
5 #include <linux/virtio_config.h>
6 #include <linux/skbuff.h>
8 #include <uapi/linux/virtio_ids.h>
9 #include <uapi/linux/virtio_bt.h>
11 #include <net/bluetooth/bluetooth.h>
12 #include <net/bluetooth/hci_core.h>
22 struct virtio_bluetooth {
23 struct virtio_device *vdev;
24 struct virtqueue *vqs[VIRTBT_NUM_VQS];
25 struct work_struct rx;
29 static int virtbt_add_inbuf(struct virtio_bluetooth *vbt)
31 struct virtqueue *vq = vbt->vqs[VIRTBT_VQ_RX];
32 struct scatterlist sg[1];
36 skb = alloc_skb(1000, GFP_KERNEL);
40 sg_init_one(sg, skb->data, 1000);
42 err = virtqueue_add_inbuf(vq, sg, 1, skb, GFP_KERNEL);
51 static int virtbt_open(struct hci_dev *hdev)
53 struct virtio_bluetooth *vbt = hci_get_drvdata(hdev);
55 if (virtbt_add_inbuf(vbt) < 0)
58 virtqueue_kick(vbt->vqs[VIRTBT_VQ_RX]);
62 static int virtbt_close(struct hci_dev *hdev)
64 struct virtio_bluetooth *vbt = hci_get_drvdata(hdev);
67 cancel_work_sync(&vbt->rx);
69 for (i = 0; i < ARRAY_SIZE(vbt->vqs); i++) {
70 struct virtqueue *vq = vbt->vqs[i];
73 while ((skb = virtqueue_detach_unused_buf(vq)))
80 static int virtbt_flush(struct hci_dev *hdev)
85 static int virtbt_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
87 struct virtio_bluetooth *vbt = hci_get_drvdata(hdev);
88 struct scatterlist sg[1];
91 memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
93 sg_init_one(sg, skb->data, skb->len);
94 err = virtqueue_add_outbuf(vbt->vqs[VIRTBT_VQ_TX], sg, 1, skb,
101 virtqueue_kick(vbt->vqs[VIRTBT_VQ_TX]);
105 static int virtbt_setup_zephyr(struct hci_dev *hdev)
109 /* Read Build Information */
110 skb = __hci_cmd_sync(hdev, 0xfc08, 0, NULL, HCI_INIT_TIMEOUT);
114 bt_dev_info(hdev, "%s", (char *)(skb->data + 1));
116 hci_set_fw_info(hdev, "%s", skb->data + 1);
122 static int virtbt_set_bdaddr_zephyr(struct hci_dev *hdev,
123 const bdaddr_t *bdaddr)
128 skb = __hci_cmd_sync(hdev, 0xfc06, 6, bdaddr, HCI_INIT_TIMEOUT);
136 static int virtbt_setup_intel(struct hci_dev *hdev)
140 /* Intel Read Version */
141 skb = __hci_cmd_sync(hdev, 0xfc05, 0, NULL, HCI_CMD_TIMEOUT);
149 static int virtbt_set_bdaddr_intel(struct hci_dev *hdev, const bdaddr_t *bdaddr)
153 /* Intel Write BD Address */
154 skb = __hci_cmd_sync(hdev, 0xfc31, 6, bdaddr, HCI_INIT_TIMEOUT);
162 static int virtbt_setup_realtek(struct hci_dev *hdev)
166 /* Read ROM Version */
167 skb = __hci_cmd_sync(hdev, 0xfc6d, 0, NULL, HCI_INIT_TIMEOUT);
171 bt_dev_info(hdev, "ROM version %u", *((__u8 *) (skb->data + 1)));
177 static int virtbt_shutdown_generic(struct hci_dev *hdev)
182 skb = __hci_cmd_sync(hdev, HCI_OP_RESET, 0, NULL, HCI_INIT_TIMEOUT);
190 static void virtbt_rx_handle(struct virtio_bluetooth *vbt, struct sk_buff *skb)
194 pkt_type = *((__u8 *) skb->data);
199 case HCI_ACLDATA_PKT:
200 case HCI_SCODATA_PKT:
201 case HCI_ISODATA_PKT:
202 hci_skb_pkt_type(skb) = pkt_type;
203 hci_recv_frame(vbt->hdev, skb);
211 static void virtbt_rx_work(struct work_struct *work)
213 struct virtio_bluetooth *vbt = container_of(work,
214 struct virtio_bluetooth, rx);
218 skb = virtqueue_get_buf(vbt->vqs[VIRTBT_VQ_RX], &len);
223 virtbt_rx_handle(vbt, skb);
225 if (virtbt_add_inbuf(vbt) < 0)
228 virtqueue_kick(vbt->vqs[VIRTBT_VQ_RX]);
231 static void virtbt_tx_done(struct virtqueue *vq)
236 while ((skb = virtqueue_get_buf(vq, &len)))
240 static void virtbt_rx_done(struct virtqueue *vq)
242 struct virtio_bluetooth *vbt = vq->vdev->priv;
244 schedule_work(&vbt->rx);
247 static int virtbt_probe(struct virtio_device *vdev)
249 vq_callback_t *callbacks[VIRTBT_NUM_VQS] = {
250 [VIRTBT_VQ_TX] = virtbt_tx_done,
251 [VIRTBT_VQ_RX] = virtbt_rx_done,
253 const char *names[VIRTBT_NUM_VQS] = {
254 [VIRTBT_VQ_TX] = "tx",
255 [VIRTBT_VQ_RX] = "rx",
257 struct virtio_bluetooth *vbt;
258 struct hci_dev *hdev;
262 if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
265 type = virtio_cread8(vdev, offsetof(struct virtio_bt_config, type));
268 case VIRTIO_BT_CONFIG_TYPE_PRIMARY:
269 case VIRTIO_BT_CONFIG_TYPE_AMP:
275 vbt = kzalloc(sizeof(*vbt), GFP_KERNEL);
282 INIT_WORK(&vbt->rx, virtbt_rx_work);
284 err = virtio_find_vqs(vdev, VIRTBT_NUM_VQS, vbt->vqs, callbacks,
289 hdev = hci_alloc_dev();
297 hdev->bus = HCI_VIRTIO;
298 hdev->dev_type = type;
299 hci_set_drvdata(hdev, vbt);
301 hdev->open = virtbt_open;
302 hdev->close = virtbt_close;
303 hdev->flush = virtbt_flush;
304 hdev->send = virtbt_send_frame;
306 if (virtio_has_feature(vdev, VIRTIO_BT_F_VND_HCI)) {
309 virtio_cread(vdev, struct virtio_bt_config, vendor, &vendor);
312 case VIRTIO_BT_CONFIG_VENDOR_ZEPHYR:
313 hdev->manufacturer = 1521;
314 hdev->setup = virtbt_setup_zephyr;
315 hdev->shutdown = virtbt_shutdown_generic;
316 hdev->set_bdaddr = virtbt_set_bdaddr_zephyr;
319 case VIRTIO_BT_CONFIG_VENDOR_INTEL:
320 hdev->manufacturer = 2;
321 hdev->setup = virtbt_setup_intel;
322 hdev->shutdown = virtbt_shutdown_generic;
323 hdev->set_bdaddr = virtbt_set_bdaddr_intel;
324 set_bit(HCI_QUIRK_STRICT_DUPLICATE_FILTER, &hdev->quirks);
325 set_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &hdev->quirks);
326 set_bit(HCI_QUIRK_WIDEBAND_SPEECH_SUPPORTED, &hdev->quirks);
329 case VIRTIO_BT_CONFIG_VENDOR_REALTEK:
330 hdev->manufacturer = 93;
331 hdev->setup = virtbt_setup_realtek;
332 hdev->shutdown = virtbt_shutdown_generic;
333 set_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &hdev->quirks);
334 set_bit(HCI_QUIRK_WIDEBAND_SPEECH_SUPPORTED, &hdev->quirks);
339 if (virtio_has_feature(vdev, VIRTIO_BT_F_MSFT_EXT)) {
342 virtio_cread(vdev, struct virtio_bt_config,
343 msft_opcode, &msft_opcode);
345 hci_set_msft_opcode(hdev, msft_opcode);
348 if (virtio_has_feature(vdev, VIRTIO_BT_F_AOSP_EXT))
349 hci_set_aosp_capable(hdev);
351 if (hci_register_dev(hdev) < 0) {
360 vdev->config->del_vqs(vdev);
364 static void virtbt_remove(struct virtio_device *vdev)
366 struct virtio_bluetooth *vbt = vdev->priv;
367 struct hci_dev *hdev = vbt->hdev;
369 hci_unregister_dev(hdev);
370 virtio_reset_device(vdev);
375 vdev->config->del_vqs(vdev);
379 static struct virtio_device_id virtbt_table[] = {
380 { VIRTIO_ID_BT, VIRTIO_DEV_ANY_ID },
384 MODULE_DEVICE_TABLE(virtio, virtbt_table);
386 static const unsigned int virtbt_features[] = {
388 VIRTIO_BT_F_MSFT_EXT,
389 VIRTIO_BT_F_AOSP_EXT,
392 static struct virtio_driver virtbt_driver = {
393 .driver.name = KBUILD_MODNAME,
394 .driver.owner = THIS_MODULE,
395 .feature_table = virtbt_features,
396 .feature_table_size = ARRAY_SIZE(virtbt_features),
397 .id_table = virtbt_table,
398 .probe = virtbt_probe,
399 .remove = virtbt_remove,
402 module_virtio_driver(virtbt_driver);
404 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
405 MODULE_DESCRIPTION("Generic Bluetooth VIRTIO driver ver " VERSION);
406 MODULE_VERSION(VERSION);
407 MODULE_LICENSE("GPL");