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24#include <linux/module.h>
25
26#include <linux/kernel.h>
27#include <linux/init.h>
28#include <linux/slab.h>
29#include <linux/types.h>
30#include <linux/errno.h>
31#include <linux/skbuff.h>
32
33#include <linux/device.h>
34#include <linux/firmware.h>
35
36#include <linux/usb.h>
37
38#include <net/bluetooth/bluetooth.h>
39#include <net/bluetooth/hci_core.h>
40
41#define VERSION "1.2"
42
43static struct usb_driver bfusb_driver;
44
45static const struct usb_device_id bfusb_table[] = {
46
47 { USB_DEVICE(0x057c, 0x2200) },
48
49 { }
50};
51
52MODULE_DEVICE_TABLE(usb, bfusb_table);
53
54#define BFUSB_MAX_BLOCK_SIZE 256
55
56#define BFUSB_BLOCK_TIMEOUT 3000
57
58#define BFUSB_TX_PROCESS 1
59#define BFUSB_TX_WAKEUP 2
60
61#define BFUSB_MAX_BULK_TX 2
62#define BFUSB_MAX_BULK_RX 2
63
64struct bfusb_data {
65 struct hci_dev *hdev;
66
67 unsigned long state;
68
69 struct usb_device *udev;
70
71 unsigned int bulk_in_ep;
72 unsigned int bulk_out_ep;
73 unsigned int bulk_pkt_size;
74
75 rwlock_t lock;
76
77 struct sk_buff_head transmit_q;
78
79 struct sk_buff *reassembly;
80
81 atomic_t pending_tx;
82 struct sk_buff_head pending_q;
83 struct sk_buff_head completed_q;
84};
85
86struct bfusb_data_scb {
87 struct urb *urb;
88};
89
90static void bfusb_tx_complete(struct urb *urb);
91static void bfusb_rx_complete(struct urb *urb);
92
93static struct urb *bfusb_get_completed(struct bfusb_data *data)
94{
95 struct sk_buff *skb;
96 struct urb *urb = NULL;
97
98 BT_DBG("bfusb %p", data);
99
100 skb = skb_dequeue(&data->completed_q);
101 if (skb) {
102 urb = ((struct bfusb_data_scb *) skb->cb)->urb;
103 kfree_skb(skb);
104 }
105
106 return urb;
107}
108
109static void bfusb_unlink_urbs(struct bfusb_data *data)
110{
111 struct sk_buff *skb;
112 struct urb *urb;
113
114 BT_DBG("bfusb %p", data);
115
116 while ((skb = skb_dequeue(&data->pending_q))) {
117 urb = ((struct bfusb_data_scb *) skb->cb)->urb;
118 usb_kill_urb(urb);
119 skb_queue_tail(&data->completed_q, skb);
120 }
121
122 while ((urb = bfusb_get_completed(data)))
123 usb_free_urb(urb);
124}
125
126static int bfusb_send_bulk(struct bfusb_data *data, struct sk_buff *skb)
127{
128 struct bfusb_data_scb *scb = (void *) skb->cb;
129 struct urb *urb = bfusb_get_completed(data);
130 int err, pipe;
131
132 BT_DBG("bfusb %p skb %p len %d", data, skb, skb->len);
133
134 if (!urb && !(urb = usb_alloc_urb(0, GFP_ATOMIC)))
135 return -ENOMEM;
136
137 pipe = usb_sndbulkpipe(data->udev, data->bulk_out_ep);
138
139 usb_fill_bulk_urb(urb, data->udev, pipe, skb->data, skb->len,
140 bfusb_tx_complete, skb);
141
142 scb->urb = urb;
143
144 skb_queue_tail(&data->pending_q, skb);
145
146 err = usb_submit_urb(urb, GFP_ATOMIC);
147 if (err) {
148 BT_ERR("%s bulk tx submit failed urb %p err %d",
149 data->hdev->name, urb, err);
150 skb_unlink(skb, &data->pending_q);
151 usb_free_urb(urb);
152 } else
153 atomic_inc(&data->pending_tx);
154
155 return err;
156}
157
158static void bfusb_tx_wakeup(struct bfusb_data *data)
159{
160 struct sk_buff *skb;
161
162 BT_DBG("bfusb %p", data);
163
164 if (test_and_set_bit(BFUSB_TX_PROCESS, &data->state)) {
165 set_bit(BFUSB_TX_WAKEUP, &data->state);
166 return;
167 }
168
169 do {
170 clear_bit(BFUSB_TX_WAKEUP, &data->state);
171
172 while ((atomic_read(&data->pending_tx) < BFUSB_MAX_BULK_TX) &&
173 (skb = skb_dequeue(&data->transmit_q))) {
174 if (bfusb_send_bulk(data, skb) < 0) {
175 skb_queue_head(&data->transmit_q, skb);
176 break;
177 }
178 }
179
180 } while (test_bit(BFUSB_TX_WAKEUP, &data->state));
181
182 clear_bit(BFUSB_TX_PROCESS, &data->state);
183}
184
185static void bfusb_tx_complete(struct urb *urb)
186{
187 struct sk_buff *skb = (struct sk_buff *) urb->context;
188 struct bfusb_data *data = (struct bfusb_data *) skb->dev;
189
190 BT_DBG("bfusb %p urb %p skb %p len %d", data, urb, skb, skb->len);
191
192 atomic_dec(&data->pending_tx);
193
194 if (!test_bit(HCI_RUNNING, &data->hdev->flags))
195 return;
196
197 if (!urb->status)
198 data->hdev->stat.byte_tx += skb->len;
199 else
200 data->hdev->stat.err_tx++;
201
202 read_lock(&data->lock);
203
204 skb_unlink(skb, &data->pending_q);
205 skb_queue_tail(&data->completed_q, skb);
206
207 bfusb_tx_wakeup(data);
208
209 read_unlock(&data->lock);
210}
211
212
213static int bfusb_rx_submit(struct bfusb_data *data, struct urb *urb)
214{
215 struct bfusb_data_scb *scb;
216 struct sk_buff *skb;
217 int err, pipe, size = HCI_MAX_FRAME_SIZE + 32;
218
219 BT_DBG("bfusb %p urb %p", data, urb);
220
221 if (!urb && !(urb = usb_alloc_urb(0, GFP_ATOMIC)))
222 return -ENOMEM;
223
224 skb = bt_skb_alloc(size, GFP_ATOMIC);
225 if (!skb) {
226 usb_free_urb(urb);
227 return -ENOMEM;
228 }
229
230 skb->dev = (void *) data;
231
232 scb = (struct bfusb_data_scb *) skb->cb;
233 scb->urb = urb;
234
235 pipe = usb_rcvbulkpipe(data->udev, data->bulk_in_ep);
236
237 usb_fill_bulk_urb(urb, data->udev, pipe, skb->data, size,
238 bfusb_rx_complete, skb);
239
240 skb_queue_tail(&data->pending_q, skb);
241
242 err = usb_submit_urb(urb, GFP_ATOMIC);
243 if (err) {
244 BT_ERR("%s bulk rx submit failed urb %p err %d",
245 data->hdev->name, urb, err);
246 skb_unlink(skb, &data->pending_q);
247 kfree_skb(skb);
248 usb_free_urb(urb);
249 }
250
251 return err;
252}
253
254static inline int bfusb_recv_block(struct bfusb_data *data, int hdr, unsigned char *buf, int len)
255{
256 BT_DBG("bfusb %p hdr 0x%02x data %p len %d", data, hdr, buf, len);
257
258 if (hdr & 0x10) {
259 BT_ERR("%s error in block", data->hdev->name);
260 kfree_skb(data->reassembly);
261 data->reassembly = NULL;
262 return -EIO;
263 }
264
265 if (hdr & 0x04) {
266 struct sk_buff *skb;
267 unsigned char pkt_type;
268 int pkt_len = 0;
269
270 if (data->reassembly) {
271 BT_ERR("%s unexpected start block", data->hdev->name);
272 kfree_skb(data->reassembly);
273 data->reassembly = NULL;
274 }
275
276 if (len < 1) {
277 BT_ERR("%s no packet type found", data->hdev->name);
278 return -EPROTO;
279 }
280
281 pkt_type = *buf++; len--;
282
283 switch (pkt_type) {
284 case HCI_EVENT_PKT:
285 if (len >= HCI_EVENT_HDR_SIZE) {
286 struct hci_event_hdr *hdr = (struct hci_event_hdr *) buf;
287 pkt_len = HCI_EVENT_HDR_SIZE + hdr->plen;
288 } else {
289 BT_ERR("%s event block is too short", data->hdev->name);
290 return -EILSEQ;
291 }
292 break;
293
294 case HCI_ACLDATA_PKT:
295 if (len >= HCI_ACL_HDR_SIZE) {
296 struct hci_acl_hdr *hdr = (struct hci_acl_hdr *) buf;
297 pkt_len = HCI_ACL_HDR_SIZE + __le16_to_cpu(hdr->dlen);
298 } else {
299 BT_ERR("%s data block is too short", data->hdev->name);
300 return -EILSEQ;
301 }
302 break;
303
304 case HCI_SCODATA_PKT:
305 if (len >= HCI_SCO_HDR_SIZE) {
306 struct hci_sco_hdr *hdr = (struct hci_sco_hdr *) buf;
307 pkt_len = HCI_SCO_HDR_SIZE + hdr->dlen;
308 } else {
309 BT_ERR("%s audio block is too short", data->hdev->name);
310 return -EILSEQ;
311 }
312 break;
313 }
314
315 skb = bt_skb_alloc(pkt_len, GFP_ATOMIC);
316 if (!skb) {
317 BT_ERR("%s no memory for the packet", data->hdev->name);
318 return -ENOMEM;
319 }
320
321 bt_cb(skb)->pkt_type = pkt_type;
322
323 data->reassembly = skb;
324 } else {
325 if (!data->reassembly) {
326 BT_ERR("%s unexpected continuation block", data->hdev->name);
327 return -EIO;
328 }
329 }
330
331 if (len > 0)
332 memcpy(skb_put(data->reassembly, len), buf, len);
333
334 if (hdr & 0x08) {
335 hci_recv_frame(data->hdev, data->reassembly);
336 data->reassembly = NULL;
337 }
338
339 return 0;
340}
341
342static void bfusb_rx_complete(struct urb *urb)
343{
344 struct sk_buff *skb = (struct sk_buff *) urb->context;
345 struct bfusb_data *data = (struct bfusb_data *) skb->dev;
346 unsigned char *buf = urb->transfer_buffer;
347 int count = urb->actual_length;
348 int err, hdr, len;
349
350 BT_DBG("bfusb %p urb %p skb %p len %d", data, urb, skb, skb->len);
351
352 read_lock(&data->lock);
353
354 if (!test_bit(HCI_RUNNING, &data->hdev->flags))
355 goto unlock;
356
357 if (urb->status || !count)
358 goto resubmit;
359
360 data->hdev->stat.byte_rx += count;
361
362 skb_put(skb, count);
363
364 while (count) {
365 hdr = buf[0] | (buf[1] << 8);
366
367 if (hdr & 0x4000) {
368 len = 0;
369 count -= 2;
370 buf += 2;
371 } else {
372 len = (buf[2] == 0) ? 256 : buf[2];
373 count -= 3;
374 buf += 3;
375 }
376
377 if (count < len) {
378 BT_ERR("%s block extends over URB buffer ranges",
379 data->hdev->name);
380 }
381
382 if ((hdr & 0xe1) == 0xc1)
383 bfusb_recv_block(data, hdr, buf, len);
384
385 count -= len;
386 buf += len;
387 }
388
389 skb_unlink(skb, &data->pending_q);
390 kfree_skb(skb);
391
392 bfusb_rx_submit(data, urb);
393
394 read_unlock(&data->lock);
395
396 return;
397
398resubmit:
399 urb->dev = data->udev;
400
401 err = usb_submit_urb(urb, GFP_ATOMIC);
402 if (err) {
403 BT_ERR("%s bulk resubmit failed urb %p err %d",
404 data->hdev->name, urb, err);
405 }
406
407unlock:
408 read_unlock(&data->lock);
409}
410
411static int bfusb_open(struct hci_dev *hdev)
412{
413 struct bfusb_data *data = hci_get_drvdata(hdev);
414 unsigned long flags;
415 int i, err;
416
417 BT_DBG("hdev %p bfusb %p", hdev, data);
418
419 if (test_and_set_bit(HCI_RUNNING, &hdev->flags))
420 return 0;
421
422 write_lock_irqsave(&data->lock, flags);
423
424 err = bfusb_rx_submit(data, NULL);
425 if (!err) {
426 for (i = 1; i < BFUSB_MAX_BULK_RX; i++)
427 bfusb_rx_submit(data, NULL);
428 } else {
429 clear_bit(HCI_RUNNING, &hdev->flags);
430 }
431
432 write_unlock_irqrestore(&data->lock, flags);
433
434 return err;
435}
436
437static int bfusb_flush(struct hci_dev *hdev)
438{
439 struct bfusb_data *data = hci_get_drvdata(hdev);
440
441 BT_DBG("hdev %p bfusb %p", hdev, data);
442
443 skb_queue_purge(&data->transmit_q);
444
445 return 0;
446}
447
448static int bfusb_close(struct hci_dev *hdev)
449{
450 struct bfusb_data *data = hci_get_drvdata(hdev);
451 unsigned long flags;
452
453 BT_DBG("hdev %p bfusb %p", hdev, data);
454
455 if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
456 return 0;
457
458 write_lock_irqsave(&data->lock, flags);
459 write_unlock_irqrestore(&data->lock, flags);
460
461 bfusb_unlink_urbs(data);
462 bfusb_flush(hdev);
463
464 return 0;
465}
466
467static int bfusb_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
468{
469 struct bfusb_data *data = hci_get_drvdata(hdev);
470 struct sk_buff *nskb;
471 unsigned char buf[3];
472 int sent = 0, size, count;
473
474 BT_DBG("hdev %p skb %p type %d len %d", hdev, skb, bt_cb(skb)->pkt_type, skb->len);
475
476 if (!test_bit(HCI_RUNNING, &hdev->flags))
477 return -EBUSY;
478
479 switch (bt_cb(skb)->pkt_type) {
480 case HCI_COMMAND_PKT:
481 hdev->stat.cmd_tx++;
482 break;
483 case HCI_ACLDATA_PKT:
484 hdev->stat.acl_tx++;
485 break;
486 case HCI_SCODATA_PKT:
487 hdev->stat.sco_tx++;
488 break;
489 };
490
491
492 memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
493
494 count = skb->len;
495
496
497 nskb = bt_skb_alloc(count + 32, GFP_ATOMIC);
498 if (!nskb) {
499 BT_ERR("Can't allocate memory for new packet");
500 return -ENOMEM;
501 }
502
503 nskb->dev = (void *) data;
504
505 while (count) {
506 size = min_t(uint, count, BFUSB_MAX_BLOCK_SIZE);
507
508 buf[0] = 0xc1 | ((sent == 0) ? 0x04 : 0) | ((count == size) ? 0x08 : 0);
509 buf[1] = 0x00;
510 buf[2] = (size == BFUSB_MAX_BLOCK_SIZE) ? 0 : size;
511
512 memcpy(skb_put(nskb, 3), buf, 3);
513 skb_copy_from_linear_data_offset(skb, sent, skb_put(nskb, size), size);
514
515 sent += size;
516 count -= size;
517 }
518
519
520 if ((nskb->len % data->bulk_pkt_size) == 0) {
521 buf[0] = 0xdd;
522 buf[1] = 0x00;
523 memcpy(skb_put(nskb, 2), buf, 2);
524 }
525
526 read_lock(&data->lock);
527
528 skb_queue_tail(&data->transmit_q, nskb);
529 bfusb_tx_wakeup(data);
530
531 read_unlock(&data->lock);
532
533 kfree_skb(skb);
534
535 return 0;
536}
537
538static int bfusb_load_firmware(struct bfusb_data *data,
539 const unsigned char *firmware, int count)
540{
541 unsigned char *buf;
542 int err, pipe, len, size, sent = 0;
543
544 BT_DBG("bfusb %p udev %p", data, data->udev);
545
546 BT_INFO("BlueFRITZ! USB loading firmware");
547
548 buf = kmalloc(BFUSB_MAX_BLOCK_SIZE + 3, GFP_KERNEL);
549 if (!buf) {
550 BT_ERR("Can't allocate memory chunk for firmware");
551 return -ENOMEM;
552 }
553
554 pipe = usb_sndctrlpipe(data->udev, 0);
555
556 if (usb_control_msg(data->udev, pipe, USB_REQ_SET_CONFIGURATION,
557 0, 1, 0, NULL, 0, USB_CTRL_SET_TIMEOUT) < 0) {
558 BT_ERR("Can't change to loading configuration");
559 kfree(buf);
560 return -EBUSY;
561 }
562
563 data->udev->toggle[0] = data->udev->toggle[1] = 0;
564
565 pipe = usb_sndbulkpipe(data->udev, data->bulk_out_ep);
566
567 while (count) {
568 size = min_t(uint, count, BFUSB_MAX_BLOCK_SIZE + 3);
569
570 memcpy(buf, firmware + sent, size);
571
572 err = usb_bulk_msg(data->udev, pipe, buf, size,
573 &len, BFUSB_BLOCK_TIMEOUT);
574
575 if (err || (len != size)) {
576 BT_ERR("Error in firmware loading");
577 goto error;
578 }
579
580 sent += size;
581 count -= size;
582 }
583
584 err = usb_bulk_msg(data->udev, pipe, NULL, 0,
585 &len, BFUSB_BLOCK_TIMEOUT);
586 if (err < 0) {
587 BT_ERR("Error in null packet request");
588 goto error;
589 }
590
591 pipe = usb_sndctrlpipe(data->udev, 0);
592
593 err = usb_control_msg(data->udev, pipe, USB_REQ_SET_CONFIGURATION,
594 0, 2, 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
595 if (err < 0) {
596 BT_ERR("Can't change to running configuration");
597 goto error;
598 }
599
600 data->udev->toggle[0] = data->udev->toggle[1] = 0;
601
602 BT_INFO("BlueFRITZ! USB device ready");
603
604 kfree(buf);
605 return 0;
606
607error:
608 kfree(buf);
609
610 pipe = usb_sndctrlpipe(data->udev, 0);
611
612 usb_control_msg(data->udev, pipe, USB_REQ_SET_CONFIGURATION,
613 0, 0, 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
614
615 return err;
616}
617
618static int bfusb_probe(struct usb_interface *intf, const struct usb_device_id *id)
619{
620 const struct firmware *firmware;
621 struct usb_device *udev = interface_to_usbdev(intf);
622 struct usb_host_endpoint *bulk_out_ep;
623 struct usb_host_endpoint *bulk_in_ep;
624 struct hci_dev *hdev;
625 struct bfusb_data *data;
626
627 BT_DBG("intf %p id %p", intf, id);
628
629
630 if (intf->cur_altsetting->desc.bNumEndpoints < 2)
631 return -EIO;
632
633 bulk_out_ep = &intf->cur_altsetting->endpoint[0];
634 bulk_in_ep = &intf->cur_altsetting->endpoint[1];
635
636 if (!bulk_out_ep || !bulk_in_ep) {
637 BT_ERR("Bulk endpoints not found");
638 goto done;
639 }
640
641
642 data = devm_kzalloc(&intf->dev, sizeof(struct bfusb_data), GFP_KERNEL);
643 if (!data) {
644 BT_ERR("Can't allocate memory for control structure");
645 goto done;
646 }
647
648 data->udev = udev;
649 data->bulk_in_ep = bulk_in_ep->desc.bEndpointAddress;
650 data->bulk_out_ep = bulk_out_ep->desc.bEndpointAddress;
651 data->bulk_pkt_size = le16_to_cpu(bulk_out_ep->desc.wMaxPacketSize);
652
653 rwlock_init(&data->lock);
654
655 data->reassembly = NULL;
656
657 skb_queue_head_init(&data->transmit_q);
658 skb_queue_head_init(&data->pending_q);
659 skb_queue_head_init(&data->completed_q);
660
661 if (request_firmware(&firmware, "bfubase.frm", &udev->dev) < 0) {
662 BT_ERR("Firmware request failed");
663 goto done;
664 }
665
666 BT_DBG("firmware data %p size %zu", firmware->data, firmware->size);
667
668 if (bfusb_load_firmware(data, firmware->data, firmware->size) < 0) {
669 BT_ERR("Firmware loading failed");
670 goto release;
671 }
672
673 release_firmware(firmware);
674
675
676 hdev = hci_alloc_dev();
677 if (!hdev) {
678 BT_ERR("Can't allocate HCI device");
679 goto done;
680 }
681
682 data->hdev = hdev;
683
684 hdev->bus = HCI_USB;
685 hci_set_drvdata(hdev, data);
686 SET_HCIDEV_DEV(hdev, &intf->dev);
687
688 hdev->open = bfusb_open;
689 hdev->close = bfusb_close;
690 hdev->flush = bfusb_flush;
691 hdev->send = bfusb_send_frame;
692
693 if (hci_register_dev(hdev) < 0) {
694 BT_ERR("Can't register HCI device");
695 hci_free_dev(hdev);
696 goto done;
697 }
698
699 usb_set_intfdata(intf, data);
700
701 return 0;
702
703release:
704 release_firmware(firmware);
705
706done:
707 return -EIO;
708}
709
710static void bfusb_disconnect(struct usb_interface *intf)
711{
712 struct bfusb_data *data = usb_get_intfdata(intf);
713 struct hci_dev *hdev = data->hdev;
714
715 BT_DBG("intf %p", intf);
716
717 if (!hdev)
718 return;
719
720 usb_set_intfdata(intf, NULL);
721
722 bfusb_close(hdev);
723
724 hci_unregister_dev(hdev);
725 hci_free_dev(hdev);
726}
727
728static struct usb_driver bfusb_driver = {
729 .name = "bfusb",
730 .probe = bfusb_probe,
731 .disconnect = bfusb_disconnect,
732 .id_table = bfusb_table,
733 .disable_hub_initiated_lpm = 1,
734};
735
736module_usb_driver(bfusb_driver);
737
738MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
739MODULE_DESCRIPTION("BlueFRITZ! USB driver ver " VERSION);
740MODULE_VERSION(VERSION);
741MODULE_LICENSE("GPL");
742MODULE_FIRMWARE("bfubase.frm");
743
