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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 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 skb->dev = (void *) data->hdev;
322 bt_cb(skb)->pkt_type = pkt_type;
323
324 data->reassembly = skb;
325 } else {
326 if (!data->reassembly) {
327 BT_ERR("%s unexpected continuation block", data->hdev->name);
328 return -EIO;
329 }
330 }
331
332 if (len > 0)
333 memcpy(skb_put(data->reassembly, len), buf, len);
334
335 if (hdr & 0x08) {
336 hci_recv_frame(data->reassembly);
337 data->reassembly = NULL;
338 }
339
340 return 0;
341}
342
343static void bfusb_rx_complete(struct urb *urb)
344{
345 struct sk_buff *skb = (struct sk_buff *) urb->context;
346 struct bfusb_data *data = (struct bfusb_data *) skb->dev;
347 unsigned char *buf = urb->transfer_buffer;
348 int count = urb->actual_length;
349 int err, hdr, len;
350
351 BT_DBG("bfusb %p urb %p skb %p len %d", data, urb, skb, skb->len);
352
353 read_lock(&data->lock);
354
355 if (!test_bit(HCI_RUNNING, &data->hdev->flags))
356 goto unlock;
357
358 if (urb->status || !count)
359 goto resubmit;
360
361 data->hdev->stat.byte_rx += count;
362
363 skb_put(skb, count);
364
365 while (count) {
366 hdr = buf[0] | (buf[1] << 8);
367
368 if (hdr & 0x4000) {
369 len = 0;
370 count -= 2;
371 buf += 2;
372 } else {
373 len = (buf[2] == 0) ? 256 : buf[2];
374 count -= 3;
375 buf += 3;
376 }
377
378 if (count < len) {
379 BT_ERR("%s block extends over URB buffer ranges",
380 data->hdev->name);
381 }
382
383 if ((hdr & 0xe1) == 0xc1)
384 bfusb_recv_block(data, hdr, buf, len);
385
386 count -= len;
387 buf += len;
388 }
389
390 skb_unlink(skb, &data->pending_q);
391 kfree_skb(skb);
392
393 bfusb_rx_submit(data, urb);
394
395 read_unlock(&data->lock);
396
397 return;
398
399resubmit:
400 urb->dev = data->udev;
401
402 err = usb_submit_urb(urb, GFP_ATOMIC);
403 if (err) {
404 BT_ERR("%s bulk resubmit failed urb %p err %d",
405 data->hdev->name, urb, err);
406 }
407
408unlock:
409 read_unlock(&data->lock);
410}
411
412static int bfusb_open(struct hci_dev *hdev)
413{
414 struct bfusb_data *data = hci_get_drvdata(hdev);
415 unsigned long flags;
416 int i, err;
417
418 BT_DBG("hdev %p bfusb %p", hdev, data);
419
420 if (test_and_set_bit(HCI_RUNNING, &hdev->flags))
421 return 0;
422
423 write_lock_irqsave(&data->lock, flags);
424
425 err = bfusb_rx_submit(data, NULL);
426 if (!err) {
427 for (i = 1; i < BFUSB_MAX_BULK_RX; i++)
428 bfusb_rx_submit(data, NULL);
429 } else {
430 clear_bit(HCI_RUNNING, &hdev->flags);
431 }
432
433 write_unlock_irqrestore(&data->lock, flags);
434
435 return err;
436}
437
438static int bfusb_flush(struct hci_dev *hdev)
439{
440 struct bfusb_data *data = hci_get_drvdata(hdev);
441
442 BT_DBG("hdev %p bfusb %p", hdev, data);
443
444 skb_queue_purge(&data->transmit_q);
445
446 return 0;
447}
448
449static int bfusb_close(struct hci_dev *hdev)
450{
451 struct bfusb_data *data = hci_get_drvdata(hdev);
452 unsigned long flags;
453
454 BT_DBG("hdev %p bfusb %p", hdev, data);
455
456 if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
457 return 0;
458
459 write_lock_irqsave(&data->lock, flags);
460 write_unlock_irqrestore(&data->lock, flags);
461
462 bfusb_unlink_urbs(data);
463 bfusb_flush(hdev);
464
465 return 0;
466}
467
468static int bfusb_send_frame(struct sk_buff *skb)
469{
470 struct hci_dev *hdev = (struct hci_dev *) skb->dev;
471 struct bfusb_data *data;
472 struct sk_buff *nskb;
473 unsigned char buf[3];
474 int sent = 0, size, count;
475
476 BT_DBG("hdev %p skb %p type %d len %d", hdev, skb, bt_cb(skb)->pkt_type, skb->len);
477
478 if (!hdev) {
479 BT_ERR("Frame for unknown HCI device (hdev=NULL)");
480 return -ENODEV;
481 }
482
483 if (!test_bit(HCI_RUNNING, &hdev->flags))
484 return -EBUSY;
485
486 data = hci_get_drvdata(hdev);
487
488 switch (bt_cb(skb)->pkt_type) {
489 case HCI_COMMAND_PKT:
490 hdev->stat.cmd_tx++;
491 break;
492 case HCI_ACLDATA_PKT:
493 hdev->stat.acl_tx++;
494 break;
495 case HCI_SCODATA_PKT:
496 hdev->stat.sco_tx++;
497 break;
498 };
499
500
501 memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
502
503 count = skb->len;
504
505
506 nskb = bt_skb_alloc(count + 32, GFP_ATOMIC);
507 if (!nskb) {
508 BT_ERR("Can't allocate memory for new packet");
509 return -ENOMEM;
510 }
511
512 nskb->dev = (void *) data;
513
514 while (count) {
515 size = min_t(uint, count, BFUSB_MAX_BLOCK_SIZE);
516
517 buf[0] = 0xc1 | ((sent == 0) ? 0x04 : 0) | ((count == size) ? 0x08 : 0);
518 buf[1] = 0x00;
519 buf[2] = (size == BFUSB_MAX_BLOCK_SIZE) ? 0 : size;
520
521 memcpy(skb_put(nskb, 3), buf, 3);
522 skb_copy_from_linear_data_offset(skb, sent, skb_put(nskb, size), size);
523
524 sent += size;
525 count -= size;
526 }
527
528
529 if ((nskb->len % data->bulk_pkt_size) == 0) {
530 buf[0] = 0xdd;
531 buf[1] = 0x00;
532 memcpy(skb_put(nskb, 2), buf, 2);
533 }
534
535 read_lock(&data->lock);
536
537 skb_queue_tail(&data->transmit_q, nskb);
538 bfusb_tx_wakeup(data);
539
540 read_unlock(&data->lock);
541
542 kfree_skb(skb);
543
544 return 0;
545}
546
547static int bfusb_ioctl(struct hci_dev *hdev, unsigned int cmd, unsigned long arg)
548{
549 return -ENOIOCTLCMD;
550}
551
552static int bfusb_load_firmware(struct bfusb_data *data,
553 const unsigned char *firmware, int count)
554{
555 unsigned char *buf;
556 int err, pipe, len, size, sent = 0;
557
558 BT_DBG("bfusb %p udev %p", data, data->udev);
559
560 BT_INFO("BlueFRITZ! USB loading firmware");
561
562 buf = kmalloc(BFUSB_MAX_BLOCK_SIZE + 3, GFP_KERNEL);
563 if (!buf) {
564 BT_ERR("Can't allocate memory chunk for firmware");
565 return -ENOMEM;
566 }
567
568 pipe = usb_sndctrlpipe(data->udev, 0);
569
570 if (usb_control_msg(data->udev, pipe, USB_REQ_SET_CONFIGURATION,
571 0, 1, 0, NULL, 0, USB_CTRL_SET_TIMEOUT) < 0) {
572 BT_ERR("Can't change to loading configuration");
573 kfree(buf);
574 return -EBUSY;
575 }
576
577 data->udev->toggle[0] = data->udev->toggle[1] = 0;
578
579 pipe = usb_sndbulkpipe(data->udev, data->bulk_out_ep);
580
581 while (count) {
582 size = min_t(uint, count, BFUSB_MAX_BLOCK_SIZE + 3);
583
584 memcpy(buf, firmware + sent, size);
585
586 err = usb_bulk_msg(data->udev, pipe, buf, size,
587 &len, BFUSB_BLOCK_TIMEOUT);
588
589 if (err || (len != size)) {
590 BT_ERR("Error in firmware loading");
591 goto error;
592 }
593
594 sent += size;
595 count -= size;
596 }
597
598 err = usb_bulk_msg(data->udev, pipe, NULL, 0,
599 &len, BFUSB_BLOCK_TIMEOUT);
600 if (err < 0) {
601 BT_ERR("Error in null packet request");
602 goto error;
603 }
604
605 pipe = usb_sndctrlpipe(data->udev, 0);
606
607 err = usb_control_msg(data->udev, pipe, USB_REQ_SET_CONFIGURATION,
608 0, 2, 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
609 if (err < 0) {
610 BT_ERR("Can't change to running configuration");
611 goto error;
612 }
613
614 data->udev->toggle[0] = data->udev->toggle[1] = 0;
615
616 BT_INFO("BlueFRITZ! USB device ready");
617
618 kfree(buf);
619 return 0;
620
621error:
622 kfree(buf);
623
624 pipe = usb_sndctrlpipe(data->udev, 0);
625
626 usb_control_msg(data->udev, pipe, USB_REQ_SET_CONFIGURATION,
627 0, 0, 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
628
629 return err;
630}
631
632static int bfusb_probe(struct usb_interface *intf, const struct usb_device_id *id)
633{
634 const struct firmware *firmware;
635 struct usb_device *udev = interface_to_usbdev(intf);
636 struct usb_host_endpoint *bulk_out_ep;
637 struct usb_host_endpoint *bulk_in_ep;
638 struct hci_dev *hdev;
639 struct bfusb_data *data;
640
641 BT_DBG("intf %p id %p", intf, id);
642
643
644 if (intf->cur_altsetting->desc.bNumEndpoints < 2)
645 return -EIO;
646
647 bulk_out_ep = &intf->cur_altsetting->endpoint[0];
648 bulk_in_ep = &intf->cur_altsetting->endpoint[1];
649
650 if (!bulk_out_ep || !bulk_in_ep) {
651 BT_ERR("Bulk endpoints not found");
652 goto done;
653 }
654
655
656 data = devm_kzalloc(&intf->dev, sizeof(struct bfusb_data), GFP_KERNEL);
657 if (!data) {
658 BT_ERR("Can't allocate memory for control structure");
659 goto done;
660 }
661
662 data->udev = udev;
663 data->bulk_in_ep = bulk_in_ep->desc.bEndpointAddress;
664 data->bulk_out_ep = bulk_out_ep->desc.bEndpointAddress;
665 data->bulk_pkt_size = le16_to_cpu(bulk_out_ep->desc.wMaxPacketSize);
666
667 rwlock_init(&data->lock);
668
669 data->reassembly = NULL;
670
671 skb_queue_head_init(&data->transmit_q);
672 skb_queue_head_init(&data->pending_q);
673 skb_queue_head_init(&data->completed_q);
674
675 if (request_firmware(&firmware, "bfubase.frm", &udev->dev) < 0) {
676 BT_ERR("Firmware request failed");
677 goto done;
678 }
679
680 BT_DBG("firmware data %p size %zu", firmware->data, firmware->size);
681
682 if (bfusb_load_firmware(data, firmware->data, firmware->size) < 0) {
683 BT_ERR("Firmware loading failed");
684 goto release;
685 }
686
687 release_firmware(firmware);
688
689
690 hdev = hci_alloc_dev();
691 if (!hdev) {
692 BT_ERR("Can't allocate HCI device");
693 goto done;
694 }
695
696 data->hdev = hdev;
697
698 hdev->bus = HCI_USB;
699 hci_set_drvdata(hdev, data);
700 SET_HCIDEV_DEV(hdev, &intf->dev);
701
702 hdev->open = bfusb_open;
703 hdev->close = bfusb_close;
704 hdev->flush = bfusb_flush;
705 hdev->send = bfusb_send_frame;
706 hdev->ioctl = bfusb_ioctl;
707
708 if (hci_register_dev(hdev) < 0) {
709 BT_ERR("Can't register HCI device");
710 hci_free_dev(hdev);
711 goto done;
712 }
713
714 usb_set_intfdata(intf, data);
715
716 return 0;
717
718release:
719 release_firmware(firmware);
720
721done:
722 return -EIO;
723}
724
725static void bfusb_disconnect(struct usb_interface *intf)
726{
727 struct bfusb_data *data = usb_get_intfdata(intf);
728 struct hci_dev *hdev = data->hdev;
729
730 BT_DBG("intf %p", intf);
731
732 if (!hdev)
733 return;
734
735 usb_set_intfdata(intf, NULL);
736
737 bfusb_close(hdev);
738
739 hci_unregister_dev(hdev);
740 hci_free_dev(hdev);
741}
742
743static struct usb_driver bfusb_driver = {
744 .name = "bfusb",
745 .probe = bfusb_probe,
746 .disconnect = bfusb_disconnect,
747 .id_table = bfusb_table,
748 .disable_hub_initiated_lpm = 1,
749};
750
751module_usb_driver(bfusb_driver);
752
753MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
754MODULE_DESCRIPTION("BlueFRITZ! USB driver ver " VERSION);
755MODULE_VERSION(VERSION);
756MODULE_LICENSE("GPL");
757MODULE_FIRMWARE("bfubase.frm");
758
