1 /*
2 *
3 * Digianswer Bluetooth USB driver
4 *
5 * Copyright (C) 2004-2005 Marcel Holtmann <marcel@holtmann.org>
6 *
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 *
22 */
23
24 #include <linux/config.h>
25 #include <linux/module.h>
26
27 #include <linux/kernel.h>
28 #include <linux/init.h>
29 #include <linux/slab.h>
30 #include <linux/types.h>
31 #include <linux/errno.h>
32
33 #include <linux/usb.h>
34
35 #include <net/bluetooth/bluetooth.h>
36 #include <net/bluetooth/hci_core.h>
37
38 #ifndef CONFIG_BT_HCIBPA10X_DEBUG
39 #undef BT_DBG
40 #define BT_DBG(D...)
41 #endif
42
43 #define VERSION "0.8"
44
45 static int ignore = 0;
46
47 static struct usb_device_id bpa10x_table[] = {
48 /* Tektronix BPA 100/105 (Digianswer) */
49 { USB_DEVICE(0x08fd, 0x0002) },
50
51 { } /* Terminating entry */
52 };
53
54 MODULE_DEVICE_TABLE(usb, bpa10x_table);
55
56 #define BPA10X_CMD_EP 0x00
57 #define BPA10X_EVT_EP 0x81
58 #define BPA10X_TX_EP 0x02
59 #define BPA10X_RX_EP 0x82
60
61 #define BPA10X_CMD_BUF_SIZE 252
62 #define BPA10X_EVT_BUF_SIZE 16
63 #define BPA10X_TX_BUF_SIZE 384
64 #define BPA10X_RX_BUF_SIZE 384
65
66 struct bpa10x_data {
67 struct hci_dev *hdev;
68 struct usb_device *udev;
69
70 rwlock_t lock;
71
72 struct sk_buff_head cmd_queue;
73 struct urb *cmd_urb;
74 struct urb *evt_urb;
75 struct sk_buff *evt_skb;
76 unsigned int evt_len;
77
78 struct sk_buff_head tx_queue;
79 struct urb *tx_urb;
80 struct urb *rx_urb;
81 };
82
83 #define HCI_VENDOR_HDR_SIZE 5
84
85 struct hci_vendor_hdr {
86 __u8 type;
87 __le16 snum;
88 __le16 dlen;
89 } __attribute__ ((packed));
90
91 static void bpa10x_recv_bulk(struct bpa10x_data *data, unsigned char *buf, int count)
92 {
93 struct hci_acl_hdr *ah;
94 struct hci_sco_hdr *sh;
95 struct hci_vendor_hdr *vh;
96 struct sk_buff *skb;
97 int len;
98
99 while (count) {
100 switch (*buf++) {
101 case HCI_ACLDATA_PKT:
102 ah = (struct hci_acl_hdr *) buf;
103 len = HCI_ACL_HDR_SIZE + __le16_to_cpu(ah->dlen);
104 skb = bt_skb_alloc(len, GFP_ATOMIC);
105 if (skb) {
106 memcpy(skb_put(skb, len), buf, len);
107 skb->dev = (void *) data->hdev;
108 bt_cb(skb)->pkt_type = HCI_ACLDATA_PKT;
109 hci_recv_frame(skb);
110 }
111 break;
112
113 case HCI_SCODATA_PKT:
114 sh = (struct hci_sco_hdr *) buf;
115 len = HCI_SCO_HDR_SIZE + sh->dlen;
116 skb = bt_skb_alloc(len, GFP_ATOMIC);
117 if (skb) {
118 memcpy(skb_put(skb, len), buf, len);
119 skb->dev = (void *) data->hdev;
120 bt_cb(skb)->pkt_type = HCI_SCODATA_PKT;
121 hci_recv_frame(skb);
122 }
123 break;
124
125 case HCI_VENDOR_PKT:
126 vh = (struct hci_vendor_hdr *) buf;
127 len = HCI_VENDOR_HDR_SIZE + __le16_to_cpu(vh->dlen);
128 skb = bt_skb_alloc(len, GFP_ATOMIC);
129 if (skb) {
130 memcpy(skb_put(skb, len), buf, len);
131 skb->dev = (void *) data->hdev;
132 bt_cb(skb)->pkt_type = HCI_VENDOR_PKT;
133 hci_recv_frame(skb);
134 }
135 break;
136
137 default:
138 len = count - 1;
139 break;
140 }
141
142 buf += len;
143 count -= (len + 1);
144 }
145 }
146
147 static int bpa10x_recv_event(struct bpa10x_data *data, unsigned char *buf, int size)
148 {
149 BT_DBG("data %p buf %p size %d", data, buf, size);
150
151 if (data->evt_skb) {
152 struct sk_buff *skb = data->evt_skb;
153
154 memcpy(skb_put(skb, size), buf, size);
155
156 if (skb->len == data->evt_len) {
157 data->evt_skb = NULL;
158 data->evt_len = 0;
159 hci_recv_frame(skb);
160 }
161 } else {
162 struct sk_buff *skb;
163 struct hci_event_hdr *hdr;
164 unsigned char pkt_type;
165 int pkt_len = 0;
166
167 if (size < HCI_EVENT_HDR_SIZE + 1) {
168 BT_ERR("%s event packet block with size %d is too short",
169 data->hdev->name, size);
170 return -EILSEQ;
171 }
172
173 pkt_type = *buf++;
174 size--;
175
176 if (pkt_type != HCI_EVENT_PKT) {
177 BT_ERR("%s unexpected event packet start byte 0x%02x",
178 data->hdev->name, pkt_type);
179 return -EPROTO;
180 }
181
182 hdr = (struct hci_event_hdr *) buf;
183 pkt_len = HCI_EVENT_HDR_SIZE + hdr->plen;
184
185 skb = bt_skb_alloc(pkt_len, GFP_ATOMIC);
186 if (!skb) {
187 BT_ERR("%s no memory for new event packet",
188 data->hdev->name);
189 return -ENOMEM;
190 }
191
192 skb->dev = (void *) data->hdev;
193 bt_cb(skb)->pkt_type = pkt_type;
194
195 memcpy(skb_put(skb, size), buf, size);
196
197 if (pkt_len == size) {
198 hci_recv_frame(skb);
199 } else {
200 data->evt_skb = skb;
201 data->evt_len = pkt_len;
202 }
203 }
204
205 return 0;
206 }
207
208 static void bpa10x_wakeup(struct bpa10x_data *data)
209 {
210 struct urb *urb;
211 struct sk_buff *skb;
212 int err;
213
214 BT_DBG("data %p", data);
215
216 urb = data->cmd_urb;
217 if (urb->status == -EINPROGRESS)
218 skb = NULL;
219 else
220 skb = skb_dequeue(&data->cmd_queue);
221
222 if (skb) {
223 struct usb_ctrlrequest *cr;
224
225 if (skb->len > BPA10X_CMD_BUF_SIZE) {
226 BT_ERR("%s command packet with size %d is too big",
227 data->hdev->name, skb->len);
228 kfree_skb(skb);
229 return;
230 }
231
232 cr = (struct usb_ctrlrequest *) urb->setup_packet;
233 cr->wLength = __cpu_to_le16(skb->len);
234
235 memcpy(urb->transfer_buffer, skb->data, skb->len);
236 urb->transfer_buffer_length = skb->len;
237
238 err = usb_submit_urb(urb, GFP_ATOMIC);
239 if (err < 0 && err != -ENODEV) {
240 BT_ERR("%s submit failed for command urb %p with error %d",
241 data->hdev->name, urb, err);
242 skb_queue_head(&data->cmd_queue, skb);
243 } else
244 kfree_skb(skb);
245 }
246
247 urb = data->tx_urb;
248 if (urb->status == -EINPROGRESS)
249 skb = NULL;
250 else
251 skb = skb_dequeue(&data->tx_queue);
252
253 if (skb) {
254 memcpy(urb->transfer_buffer, skb->data, skb->len);
255 urb->transfer_buffer_length = skb->len;
256
257 err = usb_submit_urb(urb, GFP_ATOMIC);
258 if (err < 0 && err != -ENODEV) {
259 BT_ERR("%s submit failed for command urb %p with error %d",
260 data->hdev->name, urb, err);
261 skb_queue_head(&data->tx_queue, skb);
262 } else
263 kfree_skb(skb);
264 }
265 }
266
267 static void bpa10x_complete(struct urb *urb, struct pt_regs *regs)
268 {
269 struct bpa10x_data *data = urb->context;
270 unsigned char *buf = urb->transfer_buffer;
271 int err, count = urb->actual_length;
272
273 BT_DBG("data %p urb %p buf %p count %d", data, urb, buf, count);
274
275 read_lock(&data->lock);
276
277 if (!test_bit(HCI_RUNNING, &data->hdev->flags))
278 goto unlock;
279
280 if (urb->status < 0 || !count)
281 goto resubmit;
282
283 if (usb_pipein(urb->pipe)) {
284 data->hdev->stat.byte_rx += count;
285
286 if (usb_pipetype(urb->pipe) == PIPE_INTERRUPT)
287 bpa10x_recv_event(data, buf, count);
288
289 if (usb_pipetype(urb->pipe) == PIPE_BULK)
290 bpa10x_recv_bulk(data, buf, count);
291 } else {
292 data->hdev->stat.byte_tx += count;
293
294 bpa10x_wakeup(data);
295 }
296
297 resubmit:
298 if (usb_pipein(urb->pipe)) {
299 err = usb_submit_urb(urb, GFP_ATOMIC);
300 if (err < 0 && err != -ENODEV) {
301 BT_ERR("%s urb %p type %d resubmit status %d",
302 data->hdev->name, urb, usb_pipetype(urb->pipe), err);
303 }
304 }
305
306 unlock:
307 read_unlock(&data->lock);
308 }
309
310 static inline struct urb *bpa10x_alloc_urb(struct usb_device *udev, unsigned int pipe,
311 size_t size, gfp_t flags, void *data)
312 {
313 struct urb *urb;
314 struct usb_ctrlrequest *cr;
315 unsigned char *buf;
316
317 BT_DBG("udev %p data %p", udev, data);
318
319 urb = usb_alloc_urb(0, flags);
320 if (!urb)
321 return NULL;
322
323 buf = kmalloc(size, flags);
324 if (!buf) {
325 usb_free_urb(urb);
326 return NULL;
327 }
328
329 switch (usb_pipetype(pipe)) {
330 case PIPE_CONTROL:
331 cr = kmalloc(sizeof(*cr), flags);
332 if (!cr) {
333 kfree(buf);
334 usb_free_urb(urb);
335 return NULL;
336 }
337
338 cr->bRequestType = USB_TYPE_VENDOR;
339 cr->bRequest = 0;
340 cr->wIndex = 0;
341 cr->wValue = 0;
342 cr->wLength = __cpu_to_le16(0);
343
344 usb_fill_control_urb(urb, udev, pipe, (void *) cr, buf, 0, bpa10x_complete, data);
345 break;
346
347 case PIPE_INTERRUPT:
348 usb_fill_int_urb(urb, udev, pipe, buf, size, bpa10x_complete, data, 1);
349 break;
350
351 case PIPE_BULK:
352 usb_fill_bulk_urb(urb, udev, pipe, buf, size, bpa10x_complete, data);
353 break;
354
355 default:
356 kfree(buf);
357 usb_free_urb(urb);
358 return NULL;
359 }
360
361 return urb;
362 }
363
364 static inline void bpa10x_free_urb(struct urb *urb)
365 {
366 BT_DBG("urb %p", urb);
367
368 if (!urb)
369 return;
370
371 kfree(urb->setup_packet);
372 kfree(urb->transfer_buffer);
373
374 usb_free_urb(urb);
375 }
376
377 static int bpa10x_open(struct hci_dev *hdev)
378 {
379 struct bpa10x_data *data = hdev->driver_data;
380 struct usb_device *udev = data->udev;
381 unsigned long flags;
382 int err;
383
384 BT_DBG("hdev %p data %p", hdev, data);
385
386 if (test_and_set_bit(HCI_RUNNING, &hdev->flags))
387 return 0;
388
389 data->cmd_urb = bpa10x_alloc_urb(udev, usb_sndctrlpipe(udev, BPA10X_CMD_EP),
390 BPA10X_CMD_BUF_SIZE, GFP_KERNEL, data);
391 if (!data->cmd_urb) {
392 err = -ENOMEM;
393 goto done;
394 }
395
396 data->evt_urb = bpa10x_alloc_urb(udev, usb_rcvintpipe(udev, BPA10X_EVT_EP),
397 BPA10X_EVT_BUF_SIZE, GFP_KERNEL, data);
398 if (!data->evt_urb) {
399 bpa10x_free_urb(data->cmd_urb);
400 err = -ENOMEM;
401 goto done;
402 }
403
404 data->rx_urb = bpa10x_alloc_urb(udev, usb_rcvbulkpipe(udev, BPA10X_RX_EP),
405 BPA10X_RX_BUF_SIZE, GFP_KERNEL, data);
406 if (!data->rx_urb) {
407 bpa10x_free_urb(data->evt_urb);
408 bpa10x_free_urb(data->cmd_urb);
409 err = -ENOMEM;
410 goto done;
411 }
412
413 data->tx_urb = bpa10x_alloc_urb(udev, usb_sndbulkpipe(udev, BPA10X_TX_EP),
414 BPA10X_TX_BUF_SIZE, GFP_KERNEL, data);
415 if (!data->rx_urb) {
416 bpa10x_free_urb(data->rx_urb);
417 bpa10x_free_urb(data->evt_urb);
418 bpa10x_free_urb(data->cmd_urb);
419 err = -ENOMEM;
420 goto done;
421 }
422
423 write_lock_irqsave(&data->lock, flags);
424
425 err = usb_submit_urb(data->evt_urb, GFP_ATOMIC);
426 if (err < 0) {
427 BT_ERR("%s submit failed for event urb %p with error %d",
428 data->hdev->name, data->evt_urb, err);
429 } else {
430 err = usb_submit_urb(data->rx_urb, GFP_ATOMIC);
431 if (err < 0) {
432 BT_ERR("%s submit failed for rx urb %p with error %d",
433 data->hdev->name, data->evt_urb, err);
434 usb_kill_urb(data->evt_urb);
435 }
436 }
437
438 write_unlock_irqrestore(&data->lock, flags);
439
440 done:
441 if (err < 0)
442 clear_bit(HCI_RUNNING, &hdev->flags);
443
444 return err;
445 }
446
447 static int bpa10x_close(struct hci_dev *hdev)
448 {
449 struct bpa10x_data *data = hdev->driver_data;
450 unsigned long flags;
451
452 BT_DBG("hdev %p data %p", hdev, data);
453
454 if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
455 return 0;
456
457 write_lock_irqsave(&data->lock, flags);
458
459 skb_queue_purge(&data->cmd_queue);
460 usb_kill_urb(data->cmd_urb);
461 usb_kill_urb(data->evt_urb);
462 usb_kill_urb(data->rx_urb);
463 usb_kill_urb(data->tx_urb);
464
465 write_unlock_irqrestore(&data->lock, flags);
466
467 bpa10x_free_urb(data->cmd_urb);
468 bpa10x_free_urb(data->evt_urb);
469 bpa10x_free_urb(data->rx_urb);
470 bpa10x_free_urb(data->tx_urb);
471
472 return 0;
473 }
474
475 static int bpa10x_flush(struct hci_dev *hdev)
476 {
477 struct bpa10x_data *data = hdev->driver_data;
478
479 BT_DBG("hdev %p data %p", hdev, data);
480
481 skb_queue_purge(&data->cmd_queue);
482
483 return 0;
484 }
485
486 static int bpa10x_send_frame(struct sk_buff *skb)
487 {
488 struct hci_dev *hdev = (struct hci_dev *) skb->dev;
489 struct bpa10x_data *data;
490
491 BT_DBG("hdev %p skb %p type %d len %d", hdev, skb, bt_cb(skb)->pkt_type, skb->len);
492
493 if (!hdev) {
494 BT_ERR("Frame for unknown HCI device");
495 return -ENODEV;
496 }
497
498 if (!test_bit(HCI_RUNNING, &hdev->flags))
499 return -EBUSY;
500
501 data = hdev->driver_data;
502
503 /* Prepend skb with frame type */
504 memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
505
506 switch (bt_cb(skb)->pkt_type) {
507 case HCI_COMMAND_PKT:
508 hdev->stat.cmd_tx++;
509 skb_queue_tail(&data->cmd_queue, skb);
510 break;
511
512 case HCI_ACLDATA_PKT:
513 hdev->stat.acl_tx++;
514 skb_queue_tail(&data->tx_queue, skb);
515 break;
516
517 case HCI_SCODATA_PKT:
518 hdev->stat.sco_tx++;
519 skb_queue_tail(&data->tx_queue, skb);
520 break;
521 };
522
523 read_lock(&data->lock);
524
525 bpa10x_wakeup(data);
526
527 read_unlock(&data->lock);
528
529 return 0;
530 }
531
532 static void bpa10x_destruct(struct hci_dev *hdev)
533 {
534 struct bpa10x_data *data = hdev->driver_data;
535
536 BT_DBG("hdev %p data %p", hdev, data);
537
538 kfree(data);
539 }
540
541 static int bpa10x_probe(struct usb_interface *intf, const struct usb_device_id *id)
542 {
543 struct usb_device *udev = interface_to_usbdev(intf);
544 struct hci_dev *hdev;
545 struct bpa10x_data *data;
546 int err;
547
548 BT_DBG("intf %p id %p", intf, id);
549
550 if (ignore)
551 return -ENODEV;
552
553 if (intf->cur_altsetting->desc.bInterfaceNumber > 0)
554 return -ENODEV;
555
556 data = kzalloc(sizeof(*data), GFP_KERNEL);
557 if (!data) {
558 BT_ERR("Can't allocate data structure");
559 return -ENOMEM;
560 }
561
562 data->udev = udev;
563
564 rwlock_init(&data->lock);
565
566 skb_queue_head_init(&data->cmd_queue);
567 skb_queue_head_init(&data->tx_queue);
568
569 hdev = hci_alloc_dev();
570 if (!hdev) {
571 BT_ERR("Can't allocate HCI device");
572 kfree(data);
573 return -ENOMEM;
574 }
575
576 data->hdev = hdev;
577
578 hdev->type = HCI_USB;
579 hdev->driver_data = data;
580 SET_HCIDEV_DEV(hdev, &intf->dev);
581
582 hdev->open = bpa10x_open;
583 hdev->close = bpa10x_close;
584 hdev->flush = bpa10x_flush;
585 hdev->send = bpa10x_send_frame;
586 hdev->destruct = bpa10x_destruct;
587
588 hdev->owner = THIS_MODULE;
589
590 err = hci_register_dev(hdev);
591 if (err < 0) {
592 BT_ERR("Can't register HCI device");
593 kfree(data);
594 hci_free_dev(hdev);
595 return err;
596 }
597
598 usb_set_intfdata(intf, data);
599
600 return 0;
601 }
602
603 static void bpa10x_disconnect(struct usb_interface *intf)
604 {
605 struct bpa10x_data *data = usb_get_intfdata(intf);
606 struct hci_dev *hdev = data->hdev;
607
608 BT_DBG("intf %p", intf);
609
610 if (!hdev)
611 return;
612
613 usb_set_intfdata(intf, NULL);
614
615 if (hci_unregister_dev(hdev) < 0)
616 BT_ERR("Can't unregister HCI device %s", hdev->name);
617
618 hci_free_dev(hdev);
619 }
620
621 static struct usb_driver bpa10x_driver = {
622 .name = "bpa10x",
623 .probe = bpa10x_probe,
624 .disconnect = bpa10x_disconnect,
625 .id_table = bpa10x_table,
626 };
627
628 static int __init bpa10x_init(void)
629 {
630 int err;
631
632 BT_INFO("Digianswer Bluetooth USB driver ver %s", VERSION);
633
634 err = usb_register(&bpa10x_driver);
635 if (err < 0)
636 BT_ERR("Failed to register USB driver");
637
638 return err;
639 }
640
641 static void __exit bpa10x_exit(void)
642 {
643 usb_deregister(&bpa10x_driver);
644 }
645
646 module_init(bpa10x_init);
647 module_exit(bpa10x_exit);
648
649 module_param(ignore, bool, 0644);
650 MODULE_PARM_DESC(ignore, "Ignore devices from the matching table");
651
652 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
653 MODULE_DESCRIPTION("Digianswer Bluetooth USB driver ver " VERSION);
654 MODULE_VERSION(VERSION);
655 MODULE_LICENSE("GPL");
656
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