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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(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
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(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(&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 }
83
84 return 0;
85}
86
87static int virtbt_flush(struct hci_dev *hdev)
88{
89 return 0;
90}
91
92static int virtbt_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
93{
94 struct virtio_bluetooth *vbt = hci_get_drvdata(hdev);
95 struct scatterlist sg[1];
96 int err;
97
98 memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
99
100 sg_init_one(sg, skb->data, skb->len);
101 err = virtqueue_add_outbuf(vbt->vqs[VIRTBT_VQ_TX], sg, 1, skb,
102 GFP_KERNEL);
103 if (err) {
104 kfree_skb(skb);
105 return err;
106 }
107
108 virtqueue_kick(vbt->vqs[VIRTBT_VQ_TX]);
109 return 0;
110}
111
112static int virtbt_setup_zephyr(struct hci_dev *hdev)
113{
114 struct sk_buff *skb;
115
116 /* Read Build Information */
117 skb = __hci_cmd_sync(hdev, 0xfc08, 0, NULL, HCI_INIT_TIMEOUT);
118 if (IS_ERR(skb))
119 return PTR_ERR(skb);
120
121 bt_dev_info(hdev, "%s", (char *)(skb->data + 1));
122
123 hci_set_fw_info(hdev, "%s", skb->data + 1);
124
125 kfree_skb(skb);
126 return 0;
127}
128
129static int virtbt_set_bdaddr_zephyr(struct hci_dev *hdev,
130 const bdaddr_t *bdaddr)
131{
132 struct sk_buff *skb;
133
134 /* Write BD_ADDR */
135 skb = __hci_cmd_sync(hdev, 0xfc06, 6, bdaddr, HCI_INIT_TIMEOUT);
136 if (IS_ERR(skb))
137 return PTR_ERR(skb);
138
139 kfree_skb(skb);
140 return 0;
141}
142
143static int virtbt_setup_intel(struct hci_dev *hdev)
144{
145 struct sk_buff *skb;
146
147 /* Intel Read Version */
148 skb = __hci_cmd_sync(hdev, 0xfc05, 0, NULL, HCI_CMD_TIMEOUT);
149 if (IS_ERR(skb))
150 return PTR_ERR(skb);
151
152 kfree_skb(skb);
153 return 0;
154}
155
156static int virtbt_set_bdaddr_intel(struct hci_dev *hdev, const bdaddr_t *bdaddr)
157{
158 struct sk_buff *skb;
159
160 /* Intel Write BD Address */
161 skb = __hci_cmd_sync(hdev, 0xfc31, 6, bdaddr, HCI_INIT_TIMEOUT);
162 if (IS_ERR(skb))
163 return PTR_ERR(skb);
164
165 kfree_skb(skb);
166 return 0;
167}
168
169static int virtbt_setup_realtek(struct hci_dev *hdev)
170{
171 struct sk_buff *skb;
172
173 /* Read ROM Version */
174 skb = __hci_cmd_sync(hdev, 0xfc6d, 0, NULL, HCI_INIT_TIMEOUT);
175 if (IS_ERR(skb))
176 return PTR_ERR(skb);
177
178 bt_dev_info(hdev, "ROM version %u", *((__u8 *) (skb->data + 1)));
179
180 kfree_skb(skb);
181 return 0;
182}
183
184static int virtbt_shutdown_generic(struct hci_dev *hdev)
185{
186 struct sk_buff *skb;
187
188 /* Reset */
189 skb = __hci_cmd_sync(hdev, HCI_OP_RESET, 0, NULL, HCI_INIT_TIMEOUT);
190 if (IS_ERR(skb))
191 return PTR_ERR(skb);
192
193 kfree_skb(skb);
194 return 0;
195}
196
197static void virtbt_rx_handle(struct virtio_bluetooth *vbt, struct sk_buff *skb)
198{
199 __u8 pkt_type;
200
201 pkt_type = *((__u8 *) skb->data);
202 skb_pull(skb, 1);
203
204 switch (pkt_type) {
205 case HCI_EVENT_PKT:
206 case HCI_ACLDATA_PKT:
207 case HCI_SCODATA_PKT:
208 case HCI_ISODATA_PKT:
209 hci_skb_pkt_type(skb) = pkt_type;
210 hci_recv_frame(vbt->hdev, skb);
211 break;
212 default:
213 kfree_skb(skb);
214 break;
215 }
216}
217
218static void virtbt_rx_work(struct work_struct *work)
219{
220 struct virtio_bluetooth *vbt = container_of(work,
221 struct virtio_bluetooth, rx);
222 struct sk_buff *skb;
223 unsigned int len;
224
225 skb = virtqueue_get_buf(vbt->vqs[VIRTBT_VQ_RX], &len);
226 if (!skb)
227 return;
228
229 skb_put(skb, len);
230 virtbt_rx_handle(vbt, skb);
231
232 if (virtbt_add_inbuf(vbt) < 0)
233 return;
234
235 virtqueue_kick(vbt->vqs[VIRTBT_VQ_RX]);
236}
237
238static void virtbt_tx_done(struct virtqueue *vq)
239{
240 struct sk_buff *skb;
241 unsigned int len;
242
243 while ((skb = virtqueue_get_buf(vq, &len)))
244 kfree_skb(skb);
245}
246
247static void virtbt_rx_done(struct virtqueue *vq)
248{
249 struct virtio_bluetooth *vbt = vq->vdev->priv;
250
251 schedule_work(&vbt->rx);
252}
253
254static int virtbt_probe(struct virtio_device *vdev)
255{
256 vq_callback_t *callbacks[VIRTBT_NUM_VQS] = {
257 [VIRTBT_VQ_TX] = virtbt_tx_done,
258 [VIRTBT_VQ_RX] = virtbt_rx_done,
259 };
260 const char *names[VIRTBT_NUM_VQS] = {
261 [VIRTBT_VQ_TX] = "tx",
262 [VIRTBT_VQ_RX] = "rx",
263 };
264 struct virtio_bluetooth *vbt;
265 struct hci_dev *hdev;
266 int err;
267 __u8 type;
268
269 if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
270 return -ENODEV;
271
272 type = virtio_cread8(vdev, offsetof(struct virtio_bt_config, type));
273
274 switch (type) {
275 case VIRTIO_BT_CONFIG_TYPE_PRIMARY:
276 case VIRTIO_BT_CONFIG_TYPE_AMP:
277 break;
278 default:
279 return -EINVAL;
280 }
281
282 vbt = kzalloc(sizeof(*vbt), GFP_KERNEL);
283 if (!vbt)
284 return -ENOMEM;
285
286 vdev->priv = vbt;
287 vbt->vdev = vdev;
288
289 INIT_WORK(&vbt->rx, virtbt_rx_work);
290
291 err = virtio_find_vqs(vdev, VIRTBT_NUM_VQS, vbt->vqs, callbacks,
292 names, NULL);
293 if (err)
294 return err;
295
296 hdev = hci_alloc_dev();
297 if (!hdev) {
298 err = -ENOMEM;
299 goto failed;
300 }
301
302 vbt->hdev = hdev;
303
304 hdev->bus = HCI_VIRTIO;
305 hdev->dev_type = type;
306 hci_set_drvdata(hdev, vbt);
307
308 hdev->open = virtbt_open;
309 hdev->close = virtbt_close;
310 hdev->flush = virtbt_flush;
311 hdev->send = virtbt_send_frame;
312
313 if (virtio_has_feature(vdev, VIRTIO_BT_F_VND_HCI)) {
314 __u16 vendor;
315
316 if (virtio_has_feature(vdev, VIRTIO_BT_F_CONFIG_V2))
317 virtio_cread(vdev, struct virtio_bt_config_v2,
318 vendor, &vendor);
319 else
320 virtio_cread(vdev, struct virtio_bt_config,
321 vendor, &vendor);
322
323 switch (vendor) {
324 case VIRTIO_BT_CONFIG_VENDOR_ZEPHYR:
325 hdev->manufacturer = 1521;
326 hdev->setup = virtbt_setup_zephyr;
327 hdev->shutdown = virtbt_shutdown_generic;
328 hdev->set_bdaddr = virtbt_set_bdaddr_zephyr;
329 break;
330
331 case VIRTIO_BT_CONFIG_VENDOR_INTEL:
332 hdev->manufacturer = 2;
333 hdev->setup = virtbt_setup_intel;
334 hdev->shutdown = virtbt_shutdown_generic;
335 hdev->set_bdaddr = virtbt_set_bdaddr_intel;
336 set_bit(HCI_QUIRK_STRICT_DUPLICATE_FILTER, &hdev->quirks);
337 set_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &hdev->quirks);
338 set_bit(HCI_QUIRK_WIDEBAND_SPEECH_SUPPORTED, &hdev->quirks);
339 break;
340
341 case VIRTIO_BT_CONFIG_VENDOR_REALTEK:
342 hdev->manufacturer = 93;
343 hdev->setup = virtbt_setup_realtek;
344 hdev->shutdown = virtbt_shutdown_generic;
345 set_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &hdev->quirks);
346 set_bit(HCI_QUIRK_WIDEBAND_SPEECH_SUPPORTED, &hdev->quirks);
347 break;
348 }
349 }
350
351 if (virtio_has_feature(vdev, VIRTIO_BT_F_MSFT_EXT)) {
352 __u16 msft_opcode;
353
354 if (virtio_has_feature(vdev, VIRTIO_BT_F_CONFIG_V2))
355 virtio_cread(vdev, struct virtio_bt_config_v2,
356 msft_opcode, &msft_opcode);
357 else
358 virtio_cread(vdev, struct virtio_bt_config,
359 msft_opcode, &msft_opcode);
360
361 hci_set_msft_opcode(hdev, msft_opcode);
362 }
363
364 if (virtio_has_feature(vdev, VIRTIO_BT_F_AOSP_EXT))
365 hci_set_aosp_capable(hdev);
366
367 if (hci_register_dev(hdev) < 0) {
368 hci_free_dev(hdev);
369 err = -EBUSY;
370 goto failed;
371 }
372
373 virtio_device_ready(vdev);
374 err = virtbt_open_vdev(vbt);
375 if (err)
376 goto open_failed;
377
378 return 0;
379
380open_failed:
381 hci_free_dev(hdev);
382failed:
383 vdev->config->del_vqs(vdev);
384 return err;
385}
386
387static void virtbt_remove(struct virtio_device *vdev)
388{
389 struct virtio_bluetooth *vbt = vdev->priv;
390 struct hci_dev *hdev = vbt->hdev;
391
392 hci_unregister_dev(hdev);
393 virtio_reset_device(vdev);
394 virtbt_close_vdev(vbt);
395
396 hci_free_dev(hdev);
397 vbt->hdev = NULL;
398
399 vdev->config->del_vqs(vdev);
400 kfree(vbt);
401}
402
403static struct virtio_device_id virtbt_table[] = {
404 { VIRTIO_ID_BT, VIRTIO_DEV_ANY_ID },
405 { 0 },
406};
407
408MODULE_DEVICE_TABLE(virtio, virtbt_table);
409
410static const unsigned int virtbt_features[] = {
411 VIRTIO_BT_F_VND_HCI,
412 VIRTIO_BT_F_MSFT_EXT,
413 VIRTIO_BT_F_AOSP_EXT,
414 VIRTIO_BT_F_CONFIG_V2,
415};
416
417static struct virtio_driver virtbt_driver = {
418 .driver.name = KBUILD_MODNAME,
419 .driver.owner = THIS_MODULE,
420 .feature_table = virtbt_features,
421 .feature_table_size = ARRAY_SIZE(virtbt_features),
422 .id_table = virtbt_table,
423 .probe = virtbt_probe,
424 .remove = virtbt_remove,
425};
426
427module_virtio_driver(virtbt_driver);
428
429MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
430MODULE_DESCRIPTION("Generic Bluetooth VIRTIO driver ver " VERSION);
431MODULE_VERSION(VERSION);
432MODULE_LICENSE("GPL");