1 // SPDX-License-Identifier: GPL-2.0-only
2
3 #include <linux/module.h>
4 #include <linux/virtio.h>
5 #include <linux/virtio_config.h>
6 #include <linux/skbuff.h>
7
8 #include <uapi/linux/virtio_ids.h>
9 #include <uapi/linux/virtio_bt.h>
10
11 #include <net/bluetooth/bluetooth.h>
12 #include <net/bluetooth/hci_core.h>
13
14 #define VERSION "0.1"
15
16 enum {
17 VIRTBT_VQ_TX,
18 VIRTBT_VQ_RX,
19 VIRTBT_NUM_VQS,
20 };
21
22 struct virtio_bluetooth {
23 struct virtio_device *vdev;
24 struct virtqueue *vqs[VIRTBT_NUM_VQS];
25 struct work_struct rx;
26 struct hci_dev *hdev;
27 };
28
virtbt_add_inbuf(struct virtio_bluetooth * vbt)29 static int virtbt_add_inbuf(struct virtio_bluetooth *vbt)
30 {
31 struct virtqueue *vq = vbt->vqs[VIRTBT_VQ_RX];
32 struct scatterlist sg[1];
33 struct sk_buff *skb;
34 int err;
35
36 skb = alloc_skb(1000, GFP_KERNEL);
37 if (!skb)
38 return -ENOMEM;
39
40 sg_init_one(sg, skb->data, 1000);
41
42 err = virtqueue_add_inbuf(vq, sg, 1, skb, GFP_KERNEL);
43 if (err < 0) {
44 kfree_skb(skb);
45 return err;
46 }
47
48 return 0;
49 }
50
virtbt_open(struct hci_dev * hdev)51 static int virtbt_open(struct hci_dev *hdev)
52 {
53 struct virtio_bluetooth *vbt = hci_get_drvdata(hdev);
54
55 if (virtbt_add_inbuf(vbt) < 0)
56 return -EIO;
57
58 virtqueue_kick(vbt->vqs[VIRTBT_VQ_RX]);
59 return 0;
60 }
61
virtbt_close(struct hci_dev * hdev)62 static int virtbt_close(struct hci_dev *hdev)
63 {
64 struct virtio_bluetooth *vbt = hci_get_drvdata(hdev);
65 int i;
66
67 cancel_work_sync(&vbt->rx);
68
69 for (i = 0; i < ARRAY_SIZE(vbt->vqs); i++) {
70 struct virtqueue *vq = vbt->vqs[i];
71 struct sk_buff *skb;
72
73 while ((skb = virtqueue_detach_unused_buf(vq)))
74 kfree_skb(skb);
75 }
76
77 return 0;
78 }
79
virtbt_flush(struct hci_dev * hdev)80 static int virtbt_flush(struct hci_dev *hdev)
81 {
82 return 0;
83 }
84
virtbt_send_frame(struct hci_dev * hdev,struct sk_buff * skb)85 static int virtbt_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
86 {
87 struct virtio_bluetooth *vbt = hci_get_drvdata(hdev);
88 struct scatterlist sg[1];
89 int err;
90
91 memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
92
93 sg_init_one(sg, skb->data, skb->len);
94 err = virtqueue_add_outbuf(vbt->vqs[VIRTBT_VQ_TX], sg, 1, skb,
95 GFP_KERNEL);
96 if (err) {
97 kfree_skb(skb);
98 return err;
99 }
100
101 virtqueue_kick(vbt->vqs[VIRTBT_VQ_TX]);
102 return 0;
103 }
104
virtbt_setup_zephyr(struct hci_dev * hdev)105 static int virtbt_setup_zephyr(struct hci_dev *hdev)
106 {
107 struct sk_buff *skb;
108
109 /* Read Build Information */
110 skb = __hci_cmd_sync(hdev, 0xfc08, 0, NULL, HCI_INIT_TIMEOUT);
111 if (IS_ERR(skb))
112 return PTR_ERR(skb);
113
114 bt_dev_info(hdev, "%s", (char *)(skb->data + 1));
115
116 hci_set_fw_info(hdev, "%s", skb->data + 1);
117
118 kfree_skb(skb);
119 return 0;
120 }
121
virtbt_set_bdaddr_zephyr(struct hci_dev * hdev,const bdaddr_t * bdaddr)122 static int virtbt_set_bdaddr_zephyr(struct hci_dev *hdev,
123 const bdaddr_t *bdaddr)
124 {
125 struct sk_buff *skb;
126
127 /* Write BD_ADDR */
128 skb = __hci_cmd_sync(hdev, 0xfc06, 6, bdaddr, HCI_INIT_TIMEOUT);
129 if (IS_ERR(skb))
130 return PTR_ERR(skb);
131
132 kfree_skb(skb);
133 return 0;
134 }
135
virtbt_setup_intel(struct hci_dev * hdev)136 static int virtbt_setup_intel(struct hci_dev *hdev)
137 {
138 struct sk_buff *skb;
139
140 /* Intel Read Version */
141 skb = __hci_cmd_sync(hdev, 0xfc05, 0, NULL, HCI_CMD_TIMEOUT);
142 if (IS_ERR(skb))
143 return PTR_ERR(skb);
144
145 kfree_skb(skb);
146 return 0;
147 }
148
virtbt_set_bdaddr_intel(struct hci_dev * hdev,const bdaddr_t * bdaddr)149 static int virtbt_set_bdaddr_intel(struct hci_dev *hdev, const bdaddr_t *bdaddr)
150 {
151 struct sk_buff *skb;
152
153 /* Intel Write BD Address */
154 skb = __hci_cmd_sync(hdev, 0xfc31, 6, bdaddr, HCI_INIT_TIMEOUT);
155 if (IS_ERR(skb))
156 return PTR_ERR(skb);
157
158 kfree_skb(skb);
159 return 0;
160 }
161
virtbt_setup_realtek(struct hci_dev * hdev)162 static int virtbt_setup_realtek(struct hci_dev *hdev)
163 {
164 struct sk_buff *skb;
165
166 /* Read ROM Version */
167 skb = __hci_cmd_sync(hdev, 0xfc6d, 0, NULL, HCI_INIT_TIMEOUT);
168 if (IS_ERR(skb))
169 return PTR_ERR(skb);
170
171 bt_dev_info(hdev, "ROM version %u", *((__u8 *) (skb->data + 1)));
172
173 kfree_skb(skb);
174 return 0;
175 }
176
virtbt_shutdown_generic(struct hci_dev * hdev)177 static int virtbt_shutdown_generic(struct hci_dev *hdev)
178 {
179 struct sk_buff *skb;
180
181 /* Reset */
182 skb = __hci_cmd_sync(hdev, HCI_OP_RESET, 0, NULL, HCI_INIT_TIMEOUT);
183 if (IS_ERR(skb))
184 return PTR_ERR(skb);
185
186 kfree_skb(skb);
187 return 0;
188 }
189
virtbt_rx_handle(struct virtio_bluetooth * vbt,struct sk_buff * skb)190 static void virtbt_rx_handle(struct virtio_bluetooth *vbt, struct sk_buff *skb)
191 {
192 __u8 pkt_type;
193
194 pkt_type = *((__u8 *) skb->data);
195 skb_pull(skb, 1);
196
197 switch (pkt_type) {
198 case HCI_EVENT_PKT:
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);
204 break;
205 }
206 }
207
virtbt_rx_work(struct work_struct * work)208 static void virtbt_rx_work(struct work_struct *work)
209 {
210 struct virtio_bluetooth *vbt = container_of(work,
211 struct virtio_bluetooth, rx);
212 struct sk_buff *skb;
213 unsigned int len;
214
215 skb = virtqueue_get_buf(vbt->vqs[VIRTBT_VQ_RX], &len);
216 if (!skb)
217 return;
218
219 skb->len = len;
220 virtbt_rx_handle(vbt, skb);
221
222 if (virtbt_add_inbuf(vbt) < 0)
223 return;
224
225 virtqueue_kick(vbt->vqs[VIRTBT_VQ_RX]);
226 }
227
virtbt_tx_done(struct virtqueue * vq)228 static void virtbt_tx_done(struct virtqueue *vq)
229 {
230 struct sk_buff *skb;
231 unsigned int len;
232
233 while ((skb = virtqueue_get_buf(vq, &len)))
234 kfree_skb(skb);
235 }
236
virtbt_rx_done(struct virtqueue * vq)237 static void virtbt_rx_done(struct virtqueue *vq)
238 {
239 struct virtio_bluetooth *vbt = vq->vdev->priv;
240
241 schedule_work(&vbt->rx);
242 }
243
virtbt_probe(struct virtio_device * vdev)244 static int virtbt_probe(struct virtio_device *vdev)
245 {
246 vq_callback_t *callbacks[VIRTBT_NUM_VQS] = {
247 [VIRTBT_VQ_TX] = virtbt_tx_done,
248 [VIRTBT_VQ_RX] = virtbt_rx_done,
249 };
250 const char *names[VIRTBT_NUM_VQS] = {
251 [VIRTBT_VQ_TX] = "tx",
252 [VIRTBT_VQ_RX] = "rx",
253 };
254 struct virtio_bluetooth *vbt;
255 struct hci_dev *hdev;
256 int err;
257 __u8 type;
258
259 if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
260 return -ENODEV;
261
262 type = virtio_cread8(vdev, offsetof(struct virtio_bt_config, type));
263
264 switch (type) {
265 case VIRTIO_BT_CONFIG_TYPE_PRIMARY:
266 case VIRTIO_BT_CONFIG_TYPE_AMP:
267 break;
268 default:
269 return -EINVAL;
270 }
271
272 vbt = kzalloc(sizeof(*vbt), GFP_KERNEL);
273 if (!vbt)
274 return -ENOMEM;
275
276 vdev->priv = vbt;
277 vbt->vdev = vdev;
278
279 INIT_WORK(&vbt->rx, virtbt_rx_work);
280
281 err = virtio_find_vqs(vdev, VIRTBT_NUM_VQS, vbt->vqs, callbacks,
282 names, NULL);
283 if (err)
284 return err;
285
286 hdev = hci_alloc_dev();
287 if (!hdev) {
288 err = -ENOMEM;
289 goto failed;
290 }
291
292 vbt->hdev = hdev;
293
294 hdev->bus = HCI_VIRTIO;
295 hdev->dev_type = type;
296 hci_set_drvdata(hdev, vbt);
297
298 hdev->open = virtbt_open;
299 hdev->close = virtbt_close;
300 hdev->flush = virtbt_flush;
301 hdev->send = virtbt_send_frame;
302
303 if (virtio_has_feature(vdev, VIRTIO_BT_F_VND_HCI)) {
304 __u16 vendor;
305
306 virtio_cread(vdev, struct virtio_bt_config, vendor, &vendor);
307
308 switch (vendor) {
309 case VIRTIO_BT_CONFIG_VENDOR_ZEPHYR:
310 hdev->manufacturer = 1521;
311 hdev->setup = virtbt_setup_zephyr;
312 hdev->shutdown = virtbt_shutdown_generic;
313 hdev->set_bdaddr = virtbt_set_bdaddr_zephyr;
314 break;
315
316 case VIRTIO_BT_CONFIG_VENDOR_INTEL:
317 hdev->manufacturer = 2;
318 hdev->setup = virtbt_setup_intel;
319 hdev->shutdown = virtbt_shutdown_generic;
320 hdev->set_bdaddr = virtbt_set_bdaddr_intel;
321 set_bit(HCI_QUIRK_STRICT_DUPLICATE_FILTER, &hdev->quirks);
322 set_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &hdev->quirks);
323 set_bit(HCI_QUIRK_WIDEBAND_SPEECH_SUPPORTED, &hdev->quirks);
324 break;
325
326 case VIRTIO_BT_CONFIG_VENDOR_REALTEK:
327 hdev->manufacturer = 93;
328 hdev->setup = virtbt_setup_realtek;
329 hdev->shutdown = virtbt_shutdown_generic;
330 set_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &hdev->quirks);
331 set_bit(HCI_QUIRK_WIDEBAND_SPEECH_SUPPORTED, &hdev->quirks);
332 break;
333 }
334 }
335
336 if (virtio_has_feature(vdev, VIRTIO_BT_F_MSFT_EXT)) {
337 __u16 msft_opcode;
338
339 virtio_cread(vdev, struct virtio_bt_config,
340 msft_opcode, &msft_opcode);
341
342 hci_set_msft_opcode(hdev, msft_opcode);
343 }
344
345 if (virtio_has_feature(vdev, VIRTIO_BT_F_AOSP_EXT))
346 hci_set_aosp_capable(hdev);
347
348 if (hci_register_dev(hdev) < 0) {
349 hci_free_dev(hdev);
350 err = -EBUSY;
351 goto failed;
352 }
353
354 return 0;
355
356 failed:
357 vdev->config->del_vqs(vdev);
358 return err;
359 }
360
virtbt_remove(struct virtio_device * vdev)361 static void virtbt_remove(struct virtio_device *vdev)
362 {
363 struct virtio_bluetooth *vbt = vdev->priv;
364 struct hci_dev *hdev = vbt->hdev;
365
366 hci_unregister_dev(hdev);
367 vdev->config->reset(vdev);
368
369 hci_free_dev(hdev);
370 vbt->hdev = NULL;
371
372 vdev->config->del_vqs(vdev);
373 kfree(vbt);
374 }
375
376 static struct virtio_device_id virtbt_table[] = {
377 { VIRTIO_ID_BT, VIRTIO_DEV_ANY_ID },
378 { 0 },
379 };
380
381 MODULE_DEVICE_TABLE(virtio, virtbt_table);
382
383 static const unsigned int virtbt_features[] = {
384 VIRTIO_BT_F_VND_HCI,
385 VIRTIO_BT_F_MSFT_EXT,
386 VIRTIO_BT_F_AOSP_EXT,
387 };
388
389 static struct virtio_driver virtbt_driver = {
390 .driver.name = KBUILD_MODNAME,
391 .driver.owner = THIS_MODULE,
392 .feature_table = virtbt_features,
393 .feature_table_size = ARRAY_SIZE(virtbt_features),
394 .id_table = virtbt_table,
395 .probe = virtbt_probe,
396 .remove = virtbt_remove,
397 };
398
399 module_virtio_driver(virtbt_driver);
400
401 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
402 MODULE_DESCRIPTION("Generic Bluetooth VIRTIO driver ver " VERSION);
403 MODULE_VERSION(VERSION);
404 MODULE_LICENSE("GPL");
405
