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

source code of linux/drivers/bluetooth/virtio_bt.c