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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#define VIRTBT_RX_BUF_SIZE 1000
16
17enum {
18 VIRTBT_VQ_TX,
19 VIRTBT_VQ_RX,
20 VIRTBT_NUM_VQS,
21};
22
23struct virtio_bluetooth {
24 struct virtio_device *vdev;
25 struct virtqueue *vqs[VIRTBT_NUM_VQS];
26 struct work_struct rx;
27 struct hci_dev *hdev;
28};
29
30static int virtbt_add_inbuf(struct virtio_bluetooth *vbt)
31{
32 struct virtqueue *vq = vbt->vqs[VIRTBT_VQ_RX];
33 struct scatterlist sg[1];
34 struct sk_buff *skb;
35 int err;
36
37 skb = alloc_skb(VIRTBT_RX_BUF_SIZE, GFP_KERNEL);
38 if (!skb)
39 return -ENOMEM;
40
41 sg_init_one(sg, skb->data, VIRTBT_RX_BUF_SIZE);
42
43 err = virtqueue_add_inbuf(vq, sg, 1, skb, GFP_KERNEL);
44 if (err < 0) {
45 kfree_skb(skb);
46 return err;
47 }
48
49 return 0;
50}
51
52static int virtbt_open(struct hci_dev *hdev)
53{
54 return 0;
55}
56
57static int virtbt_open_vdev(struct virtio_bluetooth *vbt)
58{
59 if (virtbt_add_inbuf(vbt) < 0)
60 return -EIO;
61
62 virtqueue_kick(vbt->vqs[VIRTBT_VQ_RX]);
63 return 0;
64}
65
66static int virtbt_close(struct hci_dev *hdev)
67{
68 return 0;
69}
70
71static int virtbt_close_vdev(struct virtio_bluetooth *vbt)
72{
73 int i;
74
75 cancel_work_sync(&vbt->rx);
76
77 for (i = 0; i < ARRAY_SIZE(vbt->vqs); i++) {
78 struct virtqueue *vq = vbt->vqs[i];
79 struct sk_buff *skb;
80
81 while ((skb = virtqueue_detach_unused_buf(vq)))
82 kfree_skb(skb);
83 cond_resched();
84 }
85
86 return 0;
87}
88
89static int virtbt_flush(struct hci_dev *hdev)
90{
91 return 0;
92}
93
94static int virtbt_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
95{
96 struct virtio_bluetooth *vbt = hci_get_drvdata(hdev);
97 struct scatterlist sg[1];
98 int err;
99
100 memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
101
102 sg_init_one(sg, skb->data, skb->len);
103 err = virtqueue_add_outbuf(vbt->vqs[VIRTBT_VQ_TX], sg, 1, skb,
104 GFP_KERNEL);
105 if (err) {
106 kfree_skb(skb);
107 return err;
108 }
109
110 virtqueue_kick(vbt->vqs[VIRTBT_VQ_TX]);
111 return 0;
112}
113
114static int virtbt_setup_zephyr(struct hci_dev *hdev)
115{
116 struct sk_buff *skb;
117
118 /* Read Build Information */
119 skb = __hci_cmd_sync(hdev, 0xfc08, 0, NULL, HCI_INIT_TIMEOUT);
120 if (IS_ERR(skb))
121 return PTR_ERR(skb);
122
123 /* Bounded print: the backend controls skb->len. */
124 if (skb->len > 1) {
125 int len = skb->len - 1;
126
127 bt_dev_info(hdev, "%.*s", len, (char *)(skb->data + 1));
128 hci_set_fw_info(hdev, "%.*s", len, skb->data + 1);
129 }
130
131 kfree_skb(skb);
132 return 0;
133}
134
135static int virtbt_set_bdaddr_zephyr(struct hci_dev *hdev,
136 const bdaddr_t *bdaddr)
137{
138 struct sk_buff *skb;
139
140 /* Write BD_ADDR */
141 skb = __hci_cmd_sync(hdev, 0xfc06, 6, bdaddr, HCI_INIT_TIMEOUT);
142 if (IS_ERR(skb))
143 return PTR_ERR(skb);
144
145 kfree_skb(skb);
146 return 0;
147}
148
149static int virtbt_setup_intel(struct hci_dev *hdev)
150{
151 struct sk_buff *skb;
152
153 /* Intel Read Version */
154 skb = __hci_cmd_sync(hdev, 0xfc05, 0, NULL, HCI_CMD_TIMEOUT);
155 if (IS_ERR(skb))
156 return PTR_ERR(skb);
157
158 kfree_skb(skb);
159 return 0;
160}
161
162static int virtbt_set_bdaddr_intel(struct hci_dev *hdev, const bdaddr_t *bdaddr)
163{
164 struct sk_buff *skb;
165
166 /* Intel Write BD Address */
167 skb = __hci_cmd_sync(hdev, 0xfc31, 6, bdaddr, HCI_INIT_TIMEOUT);
168 if (IS_ERR(skb))
169 return PTR_ERR(skb);
170
171 kfree_skb(skb);
172 return 0;
173}
174
175static int virtbt_setup_realtek(struct hci_dev *hdev)
176{
177 struct sk_buff *skb;
178
179 /* Read ROM Version */
180 skb = __hci_cmd_sync(hdev, 0xfc6d, 0, NULL, HCI_INIT_TIMEOUT);
181 if (IS_ERR(skb))
182 return PTR_ERR(skb);
183
184 bt_dev_info(hdev, "ROM version %u", *((__u8 *) (skb->data + 1)));
185
186 kfree_skb(skb);
187 return 0;
188}
189
190static int virtbt_shutdown_generic(struct hci_dev *hdev)
191{
192 struct sk_buff *skb;
193
194 /* Reset */
195 skb = __hci_cmd_sync(hdev, HCI_OP_RESET, 0, NULL, HCI_INIT_TIMEOUT);
196 if (IS_ERR(skb))
197 return PTR_ERR(skb);
198
199 kfree_skb(skb);
200 return 0;
201}
202
203static void virtbt_rx_handle(struct virtio_bluetooth *vbt, struct sk_buff *skb)
204{
205 size_t min_hdr;
206 __u8 pkt_type;
207
208 pkt_type = *((__u8 *) skb->data);
209 skb_pull(skb, 1);
210
211 switch (pkt_type) {
212 case HCI_EVENT_PKT:
213 min_hdr = sizeof(struct hci_event_hdr);
214 break;
215 case HCI_ACLDATA_PKT:
216 min_hdr = sizeof(struct hci_acl_hdr);
217 break;
218 case HCI_SCODATA_PKT:
219 min_hdr = sizeof(struct hci_sco_hdr);
220 break;
221 case HCI_ISODATA_PKT:
222 min_hdr = sizeof(struct hci_iso_hdr);
223 break;
224 default:
225 kfree_skb(skb);
226 return;
227 }
228
229 if (skb->len < min_hdr) {
230 bt_dev_err_ratelimited(vbt->hdev,
231 "rx pkt_type 0x%02x payload %u < hdr %zu\n",
232 pkt_type, skb->len, min_hdr);
233 kfree_skb(skb);
234 return;
235 }
236
237 hci_skb_pkt_type(skb) = pkt_type;
238 hci_recv_frame(vbt->hdev, skb);
239}
240
241static void virtbt_rx_work(struct work_struct *work)
242{
243 struct virtio_bluetooth *vbt = container_of(work,
244 struct virtio_bluetooth, rx);
245 struct sk_buff *skb;
246 unsigned int len;
247
248 skb = virtqueue_get_buf(vbt->vqs[VIRTBT_VQ_RX], &len);
249 if (!skb)
250 return;
251
252 if (!len || len > VIRTBT_RX_BUF_SIZE) {
253 bt_dev_err_ratelimited(vbt->hdev,
254 "rx reply len %u outside [1, %u]\n",
255 len, VIRTBT_RX_BUF_SIZE);
256 kfree_skb(skb);
257 } else {
258 skb_put(skb, len);
259 virtbt_rx_handle(vbt, skb);
260 }
261
262 if (virtbt_add_inbuf(vbt) < 0)
263 return;
264
265 virtqueue_kick(vbt->vqs[VIRTBT_VQ_RX]);
266}
267
268static void virtbt_tx_done(struct virtqueue *vq)
269{
270 struct sk_buff *skb;
271 unsigned int len;
272
273 while ((skb = virtqueue_get_buf(vq, &len)))
274 kfree_skb(skb);
275}
276
277static void virtbt_rx_done(struct virtqueue *vq)
278{
279 struct virtio_bluetooth *vbt = vq->vdev->priv;
280
281 schedule_work(&vbt->rx);
282}
283
284static int virtbt_probe(struct virtio_device *vdev)
285{
286 struct virtqueue_info vqs_info[VIRTBT_NUM_VQS] = {
287 [VIRTBT_VQ_TX] = { "tx", virtbt_tx_done },
288 [VIRTBT_VQ_RX] = { "rx", virtbt_rx_done },
289 };
290 struct virtio_bluetooth *vbt;
291 struct hci_dev *hdev;
292 int err;
293 __u8 type;
294
295 if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
296 return -ENODEV;
297
298 type = virtio_cread8(vdev, offsetof(struct virtio_bt_config, type));
299
300 switch (type) {
301 case VIRTIO_BT_CONFIG_TYPE_PRIMARY:
302 break;
303 default:
304 return -EINVAL;
305 }
306
307 vbt = kzalloc_obj(*vbt);
308 if (!vbt)
309 return -ENOMEM;
310
311 vdev->priv = vbt;
312 vbt->vdev = vdev;
313
314 INIT_WORK(&vbt->rx, virtbt_rx_work);
315
316 err = virtio_find_vqs(vdev, VIRTBT_NUM_VQS, vbt->vqs, vqs_info, NULL);
317 if (err)
318 return err;
319
320 hdev = hci_alloc_dev();
321 if (!hdev) {
322 err = -ENOMEM;
323 goto failed;
324 }
325
326 vbt->hdev = hdev;
327
328 hdev->bus = HCI_VIRTIO;
329 hci_set_drvdata(hdev, vbt);
330
331 hdev->open = virtbt_open;
332 hdev->close = virtbt_close;
333 hdev->flush = virtbt_flush;
334 hdev->send = virtbt_send_frame;
335
336 if (virtio_has_feature(vdev, VIRTIO_BT_F_VND_HCI)) {
337 __u16 vendor;
338
339 if (virtio_has_feature(vdev, VIRTIO_BT_F_CONFIG_V2))
340 virtio_cread(vdev, struct virtio_bt_config_v2,
341 vendor, &vendor);
342 else
343 virtio_cread(vdev, struct virtio_bt_config,
344 vendor, &vendor);
345
346 switch (vendor) {
347 case VIRTIO_BT_CONFIG_VENDOR_ZEPHYR:
348 hdev->manufacturer = 1521;
349 hdev->setup = virtbt_setup_zephyr;
350 hdev->shutdown = virtbt_shutdown_generic;
351 hdev->set_bdaddr = virtbt_set_bdaddr_zephyr;
352 break;
353
354 case VIRTIO_BT_CONFIG_VENDOR_INTEL:
355 hdev->manufacturer = 2;
356 hdev->setup = virtbt_setup_intel;
357 hdev->shutdown = virtbt_shutdown_generic;
358 hdev->set_bdaddr = virtbt_set_bdaddr_intel;
359 hci_set_quirk(hdev, HCI_QUIRK_STRICT_DUPLICATE_FILTER);
360 hci_set_quirk(hdev, HCI_QUIRK_SIMULTANEOUS_DISCOVERY);
361 hci_set_quirk(hdev, HCI_QUIRK_WIDEBAND_SPEECH_SUPPORTED);
362 break;
363
364 case VIRTIO_BT_CONFIG_VENDOR_REALTEK:
365 hdev->manufacturer = 93;
366 hdev->setup = virtbt_setup_realtek;
367 hdev->shutdown = virtbt_shutdown_generic;
368 hci_set_quirk(hdev, HCI_QUIRK_SIMULTANEOUS_DISCOVERY);
369 hci_set_quirk(hdev, HCI_QUIRK_WIDEBAND_SPEECH_SUPPORTED);
370 break;
371 }
372 }
373
374 if (virtio_has_feature(vdev, VIRTIO_BT_F_MSFT_EXT)) {
375 __u16 msft_opcode;
376
377 if (virtio_has_feature(vdev, VIRTIO_BT_F_CONFIG_V2))
378 virtio_cread(vdev, struct virtio_bt_config_v2,
379 msft_opcode, &msft_opcode);
380 else
381 virtio_cread(vdev, struct virtio_bt_config,
382 msft_opcode, &msft_opcode);
383
384 hci_set_msft_opcode(hdev, msft_opcode);
385 }
386
387 if (virtio_has_feature(vdev, VIRTIO_BT_F_AOSP_EXT))
388 hci_set_aosp_capable(hdev);
389
390 if (hci_register_dev(hdev) < 0) {
391 hci_free_dev(hdev);
392 err = -EBUSY;
393 goto failed;
394 }
395
396 virtio_device_ready(vdev);
397 err = virtbt_open_vdev(vbt);
398 if (err)
399 goto open_failed;
400
401 return 0;
402
403open_failed:
404 hci_free_dev(hdev);
405failed:
406 vdev->config->del_vqs(vdev);
407 return err;
408}
409
410static void virtbt_remove(struct virtio_device *vdev)
411{
412 struct virtio_bluetooth *vbt = vdev->priv;
413 struct hci_dev *hdev = vbt->hdev;
414
415 hci_unregister_dev(hdev);
416 virtio_reset_device(vdev);
417 virtbt_close_vdev(vbt);
418
419 hci_free_dev(hdev);
420 vbt->hdev = NULL;
421
422 vdev->config->del_vqs(vdev);
423 kfree(vbt);
424}
425
426static struct virtio_device_id virtbt_table[] = {
427 { VIRTIO_ID_BT, VIRTIO_DEV_ANY_ID },
428 { 0 },
429};
430
431MODULE_DEVICE_TABLE(virtio, virtbt_table);
432
433static const unsigned int virtbt_features[] = {
434 VIRTIO_BT_F_VND_HCI,
435 VIRTIO_BT_F_MSFT_EXT,
436 VIRTIO_BT_F_AOSP_EXT,
437 VIRTIO_BT_F_CONFIG_V2,
438};
439
440static struct virtio_driver virtbt_driver = {
441 .driver.name = KBUILD_MODNAME,
442 .feature_table = virtbt_features,
443 .feature_table_size = ARRAY_SIZE(virtbt_features),
444 .id_table = virtbt_table,
445 .probe = virtbt_probe,
446 .remove = virtbt_remove,
447};
448
449module_virtio_driver(virtbt_driver);
450
451MODULE_AUTHOR("Marcel Holtmann <[email protected]>");
452MODULE_DESCRIPTION("Generic Bluetooth VIRTIO driver ver " VERSION);
453MODULE_VERSION(VERSION);
454MODULE_LICENSE("GPL");