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);
37 sg_init_one(sg, skb->data, 1000);
39 err = virtqueue_add_inbuf(vq, sg, 1, skb, GFP_KERNEL);
48 static int virtbt_open(struct hci_dev *hdev)
50 struct virtio_bluetooth *vbt = hci_get_drvdata(hdev);
52 if (virtbt_add_inbuf(vbt) < 0)
55 virtqueue_kick(vbt->vqs[VIRTBT_VQ_RX]);
59 static int virtbt_close(struct hci_dev *hdev)
61 struct virtio_bluetooth *vbt = hci_get_drvdata(hdev);
64 cancel_work_sync(&vbt->rx);
66 for (i = 0; i < ARRAY_SIZE(vbt->vqs); i++) {
67 struct virtqueue *vq = vbt->vqs[i];
70 while ((skb = virtqueue_detach_unused_buf(vq)))
77 static int virtbt_flush(struct hci_dev *hdev)
82 static int virtbt_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
84 struct virtio_bluetooth *vbt = hci_get_drvdata(hdev);
85 struct scatterlist sg[1];
88 memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
90 sg_init_one(sg, skb->data, skb->len);
91 err = virtqueue_add_outbuf(vbt->vqs[VIRTBT_VQ_TX], sg, 1, skb,
98 virtqueue_kick(vbt->vqs[VIRTBT_VQ_TX]);
102 static int virtbt_setup_zephyr(struct hci_dev *hdev)
106 /* Read Build Information */
107 skb = __hci_cmd_sync(hdev, 0xfc08, 0, NULL, HCI_INIT_TIMEOUT);
111 bt_dev_info(hdev, "%s", (char *)(skb->data + 1));
113 hci_set_fw_info(hdev, "%s", skb->data + 1);
119 static int virtbt_set_bdaddr_zephyr(struct hci_dev *hdev,
120 const bdaddr_t *bdaddr)
125 skb = __hci_cmd_sync(hdev, 0xfc06, 6, bdaddr, HCI_INIT_TIMEOUT);
133 static int virtbt_setup_intel(struct hci_dev *hdev)
137 /* Intel Read Version */
138 skb = __hci_cmd_sync(hdev, 0xfc05, 0, NULL, HCI_CMD_TIMEOUT);
146 static int virtbt_set_bdaddr_intel(struct hci_dev *hdev, const bdaddr_t *bdaddr)
150 /* Intel Write BD Address */
151 skb = __hci_cmd_sync(hdev, 0xfc31, 6, bdaddr, HCI_INIT_TIMEOUT);
159 static int virtbt_setup_realtek(struct hci_dev *hdev)
163 /* Read ROM Version */
164 skb = __hci_cmd_sync(hdev, 0xfc6d, 0, NULL, HCI_INIT_TIMEOUT);
168 bt_dev_info(hdev, "ROM version %u", *((__u8 *) (skb->data + 1)));
174 static int virtbt_shutdown_generic(struct hci_dev *hdev)
179 skb = __hci_cmd_sync(hdev, HCI_OP_RESET, 0, NULL, HCI_INIT_TIMEOUT);
187 static void virtbt_rx_handle(struct virtio_bluetooth *vbt, struct sk_buff *skb)
191 pkt_type = *((__u8 *) skb->data);
196 case HCI_ACLDATA_PKT:
197 case HCI_SCODATA_PKT:
198 case HCI_ISODATA_PKT:
199 hci_skb_pkt_type(skb) = pkt_type;
200 hci_recv_frame(vbt->hdev, skb);
205 static void virtbt_rx_work(struct work_struct *work)
207 struct virtio_bluetooth *vbt = container_of(work,
208 struct virtio_bluetooth, rx);
212 skb = virtqueue_get_buf(vbt->vqs[VIRTBT_VQ_RX], &len);
217 virtbt_rx_handle(vbt, skb);
219 if (virtbt_add_inbuf(vbt) < 0)
222 virtqueue_kick(vbt->vqs[VIRTBT_VQ_RX]);
225 static void virtbt_tx_done(struct virtqueue *vq)
230 while ((skb = virtqueue_get_buf(vq, &len)))
234 static void virtbt_rx_done(struct virtqueue *vq)
236 struct virtio_bluetooth *vbt = vq->vdev->priv;
238 schedule_work(&vbt->rx);
241 static int virtbt_probe(struct virtio_device *vdev)
243 vq_callback_t *callbacks[VIRTBT_NUM_VQS] = {
244 [VIRTBT_VQ_TX] = virtbt_tx_done,
245 [VIRTBT_VQ_RX] = virtbt_rx_done,
247 const char *names[VIRTBT_NUM_VQS] = {
248 [VIRTBT_VQ_TX] = "tx",
249 [VIRTBT_VQ_RX] = "rx",
251 struct virtio_bluetooth *vbt;
252 struct hci_dev *hdev;
256 if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
259 type = virtio_cread8(vdev, offsetof(struct virtio_bt_config, type));
262 case VIRTIO_BT_CONFIG_TYPE_PRIMARY:
263 case VIRTIO_BT_CONFIG_TYPE_AMP:
269 vbt = kzalloc(sizeof(*vbt), GFP_KERNEL);
276 INIT_WORK(&vbt->rx, virtbt_rx_work);
278 err = virtio_find_vqs(vdev, VIRTBT_NUM_VQS, vbt->vqs, callbacks,
283 hdev = hci_alloc_dev();
291 hdev->bus = HCI_VIRTIO;
292 hdev->dev_type = type;
293 hci_set_drvdata(hdev, vbt);
295 hdev->open = virtbt_open;
296 hdev->close = virtbt_close;
297 hdev->flush = virtbt_flush;
298 hdev->send = virtbt_send_frame;
300 if (virtio_has_feature(vdev, VIRTIO_BT_F_VND_HCI)) {
303 virtio_cread(vdev, struct virtio_bt_config, vendor, &vendor);
306 case VIRTIO_BT_CONFIG_VENDOR_ZEPHYR:
307 hdev->manufacturer = 1521;
308 hdev->setup = virtbt_setup_zephyr;
309 hdev->shutdown = virtbt_shutdown_generic;
310 hdev->set_bdaddr = virtbt_set_bdaddr_zephyr;
313 case VIRTIO_BT_CONFIG_VENDOR_INTEL:
314 hdev->manufacturer = 2;
315 hdev->setup = virtbt_setup_intel;
316 hdev->shutdown = virtbt_shutdown_generic;
317 hdev->set_bdaddr = virtbt_set_bdaddr_intel;
318 set_bit(HCI_QUIRK_STRICT_DUPLICATE_FILTER, &hdev->quirks);
319 set_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &hdev->quirks);
320 set_bit(HCI_QUIRK_WIDEBAND_SPEECH_SUPPORTED, &hdev->quirks);
323 case VIRTIO_BT_CONFIG_VENDOR_REALTEK:
324 hdev->manufacturer = 93;
325 hdev->setup = virtbt_setup_realtek;
326 hdev->shutdown = virtbt_shutdown_generic;
327 set_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &hdev->quirks);
328 set_bit(HCI_QUIRK_WIDEBAND_SPEECH_SUPPORTED, &hdev->quirks);
333 if (virtio_has_feature(vdev, VIRTIO_BT_F_MSFT_EXT)) {
336 virtio_cread(vdev, struct virtio_bt_config,
337 msft_opcode, &msft_opcode);
339 hci_set_msft_opcode(hdev, msft_opcode);
342 if (virtio_has_feature(vdev, VIRTIO_BT_F_AOSP_EXT))
343 hci_set_aosp_capable(hdev);
345 if (hci_register_dev(hdev) < 0) {
354 vdev->config->del_vqs(vdev);
358 static void virtbt_remove(struct virtio_device *vdev)
360 struct virtio_bluetooth *vbt = vdev->priv;
361 struct hci_dev *hdev = vbt->hdev;
363 hci_unregister_dev(hdev);
364 vdev->config->reset(vdev);
369 vdev->config->del_vqs(vdev);
373 static struct virtio_device_id virtbt_table[] = {
374 { VIRTIO_ID_BT, VIRTIO_DEV_ANY_ID },
378 MODULE_DEVICE_TABLE(virtio, virtbt_table);
380 static const unsigned int virtbt_features[] = {
382 VIRTIO_BT_F_MSFT_EXT,
383 VIRTIO_BT_F_AOSP_EXT,
386 static struct virtio_driver virtbt_driver = {
387 .driver.name = KBUILD_MODNAME,
388 .driver.owner = THIS_MODULE,
389 .feature_table = virtbt_features,
390 .feature_table_size = ARRAY_SIZE(virtbt_features),
391 .id_table = virtbt_table,
392 .probe = virtbt_probe,
393 .remove = virtbt_remove,
396 module_virtio_driver(virtbt_driver);
398 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
399 MODULE_DESCRIPTION("Generic Bluetooth VIRTIO driver ver " VERSION);
400 MODULE_VERSION(VERSION);
401 MODULE_LICENSE("GPL");