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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *
4 * AVM BlueFRITZ! USB driver
5 *
6 * Copyright (C) 2003-2006 Marcel Holtmann <marcel@holtmann.org>
7 */
8
9#include <linux/module.h>
10
11#include <linux/kernel.h>
12#include <linux/init.h>
13#include <linux/slab.h>
14#include <linux/types.h>
15#include <linux/errno.h>
16#include <linux/skbuff.h>
17
18#include <linux/device.h>
19#include <linux/firmware.h>
20
21#include <linux/usb.h>
22
23#include <net/bluetooth/bluetooth.h>
24#include <net/bluetooth/hci_core.h>
25
26#define VERSION "1.2"
27
28static struct usb_driver bfusb_driver;
29
30static const struct usb_device_id bfusb_table[] = {
31 /* AVM BlueFRITZ! USB */
32 { USB_DEVICE(0x057c, 0x2200) },
33
34 { } /* Terminating entry */
35};
36
37MODULE_DEVICE_TABLE(usb, bfusb_table);
38
39#define BFUSB_MAX_BLOCK_SIZE 256
40
41#define BFUSB_BLOCK_TIMEOUT 3000
42
43#define BFUSB_TX_PROCESS 1
44#define BFUSB_TX_WAKEUP 2
45
46#define BFUSB_MAX_BULK_TX 2
47#define BFUSB_MAX_BULK_RX 2
48
49struct bfusb_data {
50 struct hci_dev *hdev;
51
52 unsigned long state;
53
54 struct usb_device *udev;
55
56 unsigned int bulk_in_ep;
57 unsigned int bulk_out_ep;
58 unsigned int bulk_pkt_size;
59
60 rwlock_t lock;
61
62 struct sk_buff_head transmit_q;
63
64 struct sk_buff *reassembly;
65
66 atomic_t pending_tx;
67 struct sk_buff_head pending_q;
68 struct sk_buff_head completed_q;
69};
70
71struct bfusb_data_scb {
72 struct urb *urb;
73};
74
75static void bfusb_tx_complete(struct urb *urb);
76static void bfusb_rx_complete(struct urb *urb);
77
78static struct urb *bfusb_get_completed(struct bfusb_data *data)
79{
80 struct sk_buff *skb;
81 struct urb *urb = NULL;
82
83 BT_DBG("bfusb %p", data);
84
85 skb = skb_dequeue(&data->completed_q);
86 if (skb) {
87 urb = ((struct bfusb_data_scb *) skb->cb)->urb;
88 kfree_skb(skb);
89 }
90
91 return urb;
92}
93
94static void bfusb_unlink_urbs(struct bfusb_data *data)
95{
96 struct sk_buff *skb;
97 struct urb *urb;
98
99 BT_DBG("bfusb %p", data);
100
101 while ((skb = skb_dequeue(&data->pending_q))) {
102 urb = ((struct bfusb_data_scb *) skb->cb)->urb;
103 usb_kill_urb(urb);
104 skb_queue_tail(&data->completed_q, skb);
105 }
106
107 while ((urb = bfusb_get_completed(data)))
108 usb_free_urb(urb);
109}
110
111static int bfusb_send_bulk(struct bfusb_data *data, struct sk_buff *skb)
112{
113 struct bfusb_data_scb *scb = (void *) skb->cb;
114 struct urb *urb = bfusb_get_completed(data);
115 int err, pipe;
116
117 BT_DBG("bfusb %p skb %p len %d", data, skb, skb->len);
118
119 if (!urb) {
120 urb = usb_alloc_urb(0, GFP_ATOMIC);
121 if (!urb)
122 return -ENOMEM;
123 }
124
125 pipe = usb_sndbulkpipe(data->udev, data->bulk_out_ep);
126
127 usb_fill_bulk_urb(urb, data->udev, pipe, skb->data, skb->len,
128 bfusb_tx_complete, skb);
129
130 scb->urb = urb;
131
132 skb_queue_tail(&data->pending_q, skb);
133
134 err = usb_submit_urb(urb, GFP_ATOMIC);
135 if (err) {
136 bt_dev_err(data->hdev, "bulk tx submit failed urb %p err %d",
137 urb, err);
138 skb_unlink(skb, &data->pending_q);
139 usb_free_urb(urb);
140 } else
141 atomic_inc(&data->pending_tx);
142
143 return err;
144}
145
146static void bfusb_tx_wakeup(struct bfusb_data *data)
147{
148 struct sk_buff *skb;
149
150 BT_DBG("bfusb %p", data);
151
152 if (test_and_set_bit(BFUSB_TX_PROCESS, &data->state)) {
153 set_bit(BFUSB_TX_WAKEUP, &data->state);
154 return;
155 }
156
157 do {
158 clear_bit(BFUSB_TX_WAKEUP, &data->state);
159
160 while ((atomic_read(&data->pending_tx) < BFUSB_MAX_BULK_TX) &&
161 (skb = skb_dequeue(&data->transmit_q))) {
162 if (bfusb_send_bulk(data, skb) < 0) {
163 skb_queue_head(&data->transmit_q, skb);
164 break;
165 }
166 }
167
168 } while (test_bit(BFUSB_TX_WAKEUP, &data->state));
169
170 clear_bit(BFUSB_TX_PROCESS, &data->state);
171}
172
173static void bfusb_tx_complete(struct urb *urb)
174{
175 struct sk_buff *skb = (struct sk_buff *) urb->context;
176 struct bfusb_data *data = (struct bfusb_data *) skb->dev;
177
178 BT_DBG("bfusb %p urb %p skb %p len %d", data, urb, skb, skb->len);
179
180 atomic_dec(&data->pending_tx);
181
182 if (!test_bit(HCI_RUNNING, &data->hdev->flags))
183 return;
184
185 if (!urb->status)
186 data->hdev->stat.byte_tx += skb->len;
187 else
188 data->hdev->stat.err_tx++;
189
190 read_lock(&data->lock);
191
192 skb_unlink(skb, &data->pending_q);
193 skb_queue_tail(&data->completed_q, skb);
194
195 bfusb_tx_wakeup(data);
196
197 read_unlock(&data->lock);
198}
199
200
201static int bfusb_rx_submit(struct bfusb_data *data, struct urb *urb)
202{
203 struct bfusb_data_scb *scb;
204 struct sk_buff *skb;
205 int err, pipe, size = HCI_MAX_FRAME_SIZE + 32;
206
207 BT_DBG("bfusb %p urb %p", data, urb);
208
209 if (!urb) {
210 urb = usb_alloc_urb(0, GFP_ATOMIC);
211 if (!urb)
212 return -ENOMEM;
213 }
214
215 skb = bt_skb_alloc(size, GFP_ATOMIC);
216 if (!skb) {
217 usb_free_urb(urb);
218 return -ENOMEM;
219 }
220
221 skb->dev = (void *) data;
222
223 scb = (struct bfusb_data_scb *) skb->cb;
224 scb->urb = urb;
225
226 pipe = usb_rcvbulkpipe(data->udev, data->bulk_in_ep);
227
228 usb_fill_bulk_urb(urb, data->udev, pipe, skb->data, size,
229 bfusb_rx_complete, skb);
230
231 skb_queue_tail(&data->pending_q, skb);
232
233 err = usb_submit_urb(urb, GFP_ATOMIC);
234 if (err) {
235 bt_dev_err(data->hdev, "bulk rx submit failed urb %p err %d",
236 urb, err);
237 skb_unlink(skb, &data->pending_q);
238 kfree_skb(skb);
239 usb_free_urb(urb);
240 }
241
242 return err;
243}
244
245static inline int bfusb_recv_block(struct bfusb_data *data, int hdr, unsigned char *buf, int len)
246{
247 BT_DBG("bfusb %p hdr 0x%02x data %p len %d", data, hdr, buf, len);
248
249 if (hdr & 0x10) {
250 bt_dev_err(data->hdev, "error in block");
251 kfree_skb(data->reassembly);
252 data->reassembly = NULL;
253 return -EIO;
254 }
255
256 if (hdr & 0x04) {
257 struct sk_buff *skb;
258 unsigned char pkt_type;
259 int pkt_len = 0;
260
261 if (data->reassembly) {
262 bt_dev_err(data->hdev, "unexpected start block");
263 kfree_skb(data->reassembly);
264 data->reassembly = NULL;
265 }
266
267 if (len < 1) {
268 bt_dev_err(data->hdev, "no packet type found");
269 return -EPROTO;
270 }
271
272 pkt_type = *buf++; len--;
273
274 switch (pkt_type) {
275 case HCI_EVENT_PKT:
276 if (len >= HCI_EVENT_HDR_SIZE) {
277 struct hci_event_hdr *hdr = (struct hci_event_hdr *) buf;
278 pkt_len = HCI_EVENT_HDR_SIZE + hdr->plen;
279 } else {
280 bt_dev_err(data->hdev, "event block is too short");
281 return -EILSEQ;
282 }
283 break;
284
285 case HCI_ACLDATA_PKT:
286 if (len >= HCI_ACL_HDR_SIZE) {
287 struct hci_acl_hdr *hdr = (struct hci_acl_hdr *) buf;
288 pkt_len = HCI_ACL_HDR_SIZE + __le16_to_cpu(hdr->dlen);
289 } else {
290 bt_dev_err(data->hdev, "data block is too short");
291 return -EILSEQ;
292 }
293 break;
294
295 case HCI_SCODATA_PKT:
296 if (len >= HCI_SCO_HDR_SIZE) {
297 struct hci_sco_hdr *hdr = (struct hci_sco_hdr *) buf;
298 pkt_len = HCI_SCO_HDR_SIZE + hdr->dlen;
299 } else {
300 bt_dev_err(data->hdev, "audio block is too short");
301 return -EILSEQ;
302 }
303 break;
304 }
305
306 skb = bt_skb_alloc(pkt_len, GFP_ATOMIC);
307 if (!skb) {
308 bt_dev_err(data->hdev, "no memory for the packet");
309 return -ENOMEM;
310 }
311
312 hci_skb_pkt_type(skb) = pkt_type;
313
314 data->reassembly = skb;
315 } else {
316 if (!data->reassembly) {
317 bt_dev_err(data->hdev, "unexpected continuation block");
318 return -EIO;
319 }
320 }
321
322 if (len > 0)
323 skb_put_data(data->reassembly, buf, len);
324
325 if (hdr & 0x08) {
326 hci_recv_frame(data->hdev, data->reassembly);
327 data->reassembly = NULL;
328 }
329
330 return 0;
331}
332
333static void bfusb_rx_complete(struct urb *urb)
334{
335 struct sk_buff *skb = (struct sk_buff *) urb->context;
336 struct bfusb_data *data = (struct bfusb_data *) skb->dev;
337 unsigned char *buf = urb->transfer_buffer;
338 int count = urb->actual_length;
339 int err, hdr, len;
340
341 BT_DBG("bfusb %p urb %p skb %p len %d", data, urb, skb, skb->len);
342
343 read_lock(&data->lock);
344
345 if (!test_bit(HCI_RUNNING, &data->hdev->flags))
346 goto unlock;
347
348 if (urb->status || !count)
349 goto resubmit;
350
351 data->hdev->stat.byte_rx += count;
352
353 skb_put(skb, count);
354
355 while (count) {
356 hdr = buf[0] | (buf[1] << 8);
357
358 if (hdr & 0x4000) {
359 len = 0;
360 count -= 2;
361 buf += 2;
362 } else {
363 len = (buf[2] == 0) ? 256 : buf[2];
364 count -= 3;
365 buf += 3;
366 }
367
368 if (count < len) {
369 bt_dev_err(data->hdev, "block extends over URB buffer ranges");
370 }
371
372 if ((hdr & 0xe1) == 0xc1)
373 bfusb_recv_block(data, hdr, buf, len);
374
375 count -= len;
376 buf += len;
377 }
378
379 skb_unlink(skb, &data->pending_q);
380 kfree_skb(skb);
381
382 bfusb_rx_submit(data, urb);
383
384 read_unlock(&data->lock);
385
386 return;
387
388resubmit:
389 urb->dev = data->udev;
390
391 err = usb_submit_urb(urb, GFP_ATOMIC);
392 if (err) {
393 bt_dev_err(data->hdev, "bulk resubmit failed urb %p err %d",
394 urb, err);
395 }
396
397unlock:
398 read_unlock(&data->lock);
399}
400
401static int bfusb_open(struct hci_dev *hdev)
402{
403 struct bfusb_data *data = hci_get_drvdata(hdev);
404 unsigned long flags;
405 int i, err;
406
407 BT_DBG("hdev %p bfusb %p", hdev, data);
408
409 write_lock_irqsave(&data->lock, flags);
410
411 err = bfusb_rx_submit(data, NULL);
412 if (!err) {
413 for (i = 1; i < BFUSB_MAX_BULK_RX; i++)
414 bfusb_rx_submit(data, NULL);
415 }
416
417 write_unlock_irqrestore(&data->lock, flags);
418
419 return err;
420}
421
422static int bfusb_flush(struct hci_dev *hdev)
423{
424 struct bfusb_data *data = hci_get_drvdata(hdev);
425
426 BT_DBG("hdev %p bfusb %p", hdev, data);
427
428 skb_queue_purge(&data->transmit_q);
429
430 return 0;
431}
432
433static int bfusb_close(struct hci_dev *hdev)
434{
435 struct bfusb_data *data = hci_get_drvdata(hdev);
436 unsigned long flags;
437
438 BT_DBG("hdev %p bfusb %p", hdev, data);
439
440 write_lock_irqsave(&data->lock, flags);
441 write_unlock_irqrestore(&data->lock, flags);
442
443 bfusb_unlink_urbs(data);
444 bfusb_flush(hdev);
445
446 return 0;
447}
448
449static int bfusb_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
450{
451 struct bfusb_data *data = hci_get_drvdata(hdev);
452 struct sk_buff *nskb;
453 unsigned char buf[3];
454 int sent = 0, size, count;
455
456 BT_DBG("hdev %p skb %p type %d len %d", hdev, skb,
457 hci_skb_pkt_type(skb), skb->len);
458
459 switch (hci_skb_pkt_type(skb)) {
460 case HCI_COMMAND_PKT:
461 hdev->stat.cmd_tx++;
462 break;
463 case HCI_ACLDATA_PKT:
464 hdev->stat.acl_tx++;
465 break;
466 case HCI_SCODATA_PKT:
467 hdev->stat.sco_tx++;
468 break;
469 }
470
471 /* Prepend skb with frame type */
472 memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
473
474 count = skb->len;
475
476 /* Max HCI frame size seems to be 1511 + 1 */
477 nskb = bt_skb_alloc(count + 32, GFP_KERNEL);
478 if (!nskb) {
479 bt_dev_err(hdev, "Can't allocate memory for new packet");
480 return -ENOMEM;
481 }
482
483 nskb->dev = (void *) data;
484
485 while (count) {
486 size = min_t(uint, count, BFUSB_MAX_BLOCK_SIZE);
487
488 buf[0] = 0xc1 | ((sent == 0) ? 0x04 : 0) | ((count == size) ? 0x08 : 0);
489 buf[1] = 0x00;
490 buf[2] = (size == BFUSB_MAX_BLOCK_SIZE) ? 0 : size;
491
492 skb_put_data(nskb, buf, 3);
493 skb_copy_from_linear_data_offset(skb, sent, skb_put(nskb, size), size);
494
495 sent += size;
496 count -= size;
497 }
498
499 /* Don't send frame with multiple size of bulk max packet */
500 if ((nskb->len % data->bulk_pkt_size) == 0) {
501 buf[0] = 0xdd;
502 buf[1] = 0x00;
503 skb_put_data(nskb, buf, 2);
504 }
505
506 read_lock(&data->lock);
507
508 skb_queue_tail(&data->transmit_q, nskb);
509 bfusb_tx_wakeup(data);
510
511 read_unlock(&data->lock);
512
513 kfree_skb(skb);
514
515 return 0;
516}
517
518static int bfusb_load_firmware(struct bfusb_data *data,
519 const unsigned char *firmware, int count)
520{
521 unsigned char *buf;
522 int err, pipe, len, size, sent = 0;
523
524 BT_DBG("bfusb %p udev %p", data, data->udev);
525
526 BT_INFO("BlueFRITZ! USB loading firmware");
527
528 buf = kmalloc(BFUSB_MAX_BLOCK_SIZE + 3, GFP_KERNEL);
529 if (!buf) {
530 BT_ERR("Can't allocate memory chunk for firmware");
531 return -ENOMEM;
532 }
533
534 pipe = usb_sndctrlpipe(data->udev, 0);
535
536 if (usb_control_msg(data->udev, pipe, USB_REQ_SET_CONFIGURATION,
537 0, 1, 0, NULL, 0, USB_CTRL_SET_TIMEOUT) < 0) {
538 BT_ERR("Can't change to loading configuration");
539 kfree(buf);
540 return -EBUSY;
541 }
542
543 data->udev->toggle[0] = data->udev->toggle[1] = 0;
544
545 pipe = usb_sndbulkpipe(data->udev, data->bulk_out_ep);
546
547 while (count) {
548 size = min_t(uint, count, BFUSB_MAX_BLOCK_SIZE + 3);
549
550 memcpy(buf, firmware + sent, size);
551
552 err = usb_bulk_msg(data->udev, pipe, buf, size,
553 &len, BFUSB_BLOCK_TIMEOUT);
554
555 if (err || (len != size)) {
556 BT_ERR("Error in firmware loading");
557 goto error;
558 }
559
560 sent += size;
561 count -= size;
562 }
563
564 err = usb_bulk_msg(data->udev, pipe, NULL, 0,
565 &len, BFUSB_BLOCK_TIMEOUT);
566 if (err < 0) {
567 BT_ERR("Error in null packet request");
568 goto error;
569 }
570
571 pipe = usb_sndctrlpipe(data->udev, 0);
572
573 err = usb_control_msg(data->udev, pipe, USB_REQ_SET_CONFIGURATION,
574 0, 2, 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
575 if (err < 0) {
576 BT_ERR("Can't change to running configuration");
577 goto error;
578 }
579
580 data->udev->toggle[0] = data->udev->toggle[1] = 0;
581
582 BT_INFO("BlueFRITZ! USB device ready");
583
584 kfree(buf);
585 return 0;
586
587error:
588 kfree(buf);
589
590 pipe = usb_sndctrlpipe(data->udev, 0);
591
592 usb_control_msg(data->udev, pipe, USB_REQ_SET_CONFIGURATION,
593 0, 0, 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
594
595 return err;
596}
597
598static int bfusb_probe(struct usb_interface *intf, const struct usb_device_id *id)
599{
600 const struct firmware *firmware;
601 struct usb_device *udev = interface_to_usbdev(intf);
602 struct usb_host_endpoint *bulk_out_ep;
603 struct usb_host_endpoint *bulk_in_ep;
604 struct hci_dev *hdev;
605 struct bfusb_data *data;
606
607 BT_DBG("intf %p id %p", intf, id);
608
609 /* Check number of endpoints */
610 if (intf->cur_altsetting->desc.bNumEndpoints < 2)
611 return -EIO;
612
613 bulk_out_ep = &intf->cur_altsetting->endpoint[0];
614 bulk_in_ep = &intf->cur_altsetting->endpoint[1];
615
616 if (!bulk_out_ep || !bulk_in_ep) {
617 BT_ERR("Bulk endpoints not found");
618 goto done;
619 }
620
621 /* Initialize control structure and load firmware */
622 data = devm_kzalloc(&intf->dev, sizeof(struct bfusb_data), GFP_KERNEL);
623 if (!data)
624 return -ENOMEM;
625
626 data->udev = udev;
627 data->bulk_in_ep = bulk_in_ep->desc.bEndpointAddress;
628 data->bulk_out_ep = bulk_out_ep->desc.bEndpointAddress;
629 data->bulk_pkt_size = le16_to_cpu(bulk_out_ep->desc.wMaxPacketSize);
630
631 if (!data->bulk_pkt_size)
632 goto done;
633
634 rwlock_init(&data->lock);
635
636 data->reassembly = NULL;
637
638 skb_queue_head_init(&data->transmit_q);
639 skb_queue_head_init(&data->pending_q);
640 skb_queue_head_init(&data->completed_q);
641
642 if (request_firmware(&firmware, "bfubase.frm", &udev->dev) < 0) {
643 BT_ERR("Firmware request failed");
644 goto done;
645 }
646
647 BT_DBG("firmware data %p size %zu", firmware->data, firmware->size);
648
649 if (bfusb_load_firmware(data, firmware->data, firmware->size) < 0) {
650 BT_ERR("Firmware loading failed");
651 goto release;
652 }
653
654 release_firmware(firmware);
655
656 /* Initialize and register HCI device */
657 hdev = hci_alloc_dev();
658 if (!hdev) {
659 BT_ERR("Can't allocate HCI device");
660 goto done;
661 }
662
663 data->hdev = hdev;
664
665 hdev->bus = HCI_USB;
666 hci_set_drvdata(hdev, data);
667 SET_HCIDEV_DEV(hdev, &intf->dev);
668
669 hdev->open = bfusb_open;
670 hdev->close = bfusb_close;
671 hdev->flush = bfusb_flush;
672 hdev->send = bfusb_send_frame;
673
674 set_bit(HCI_QUIRK_BROKEN_LOCAL_COMMANDS, &hdev->quirks);
675
676 if (hci_register_dev(hdev) < 0) {
677 BT_ERR("Can't register HCI device");
678 hci_free_dev(hdev);
679 goto done;
680 }
681
682 usb_set_intfdata(intf, data);
683
684 return 0;
685
686release:
687 release_firmware(firmware);
688
689done:
690 return -EIO;
691}
692
693static void bfusb_disconnect(struct usb_interface *intf)
694{
695 struct bfusb_data *data = usb_get_intfdata(intf);
696 struct hci_dev *hdev = data->hdev;
697
698 BT_DBG("intf %p", intf);
699
700 if (!hdev)
701 return;
702
703 usb_set_intfdata(intf, NULL);
704
705 bfusb_close(hdev);
706
707 hci_unregister_dev(hdev);
708 hci_free_dev(hdev);
709}
710
711static struct usb_driver bfusb_driver = {
712 .name = "bfusb",
713 .probe = bfusb_probe,
714 .disconnect = bfusb_disconnect,
715 .id_table = bfusb_table,
716 .disable_hub_initiated_lpm = 1,
717};
718
719module_usb_driver(bfusb_driver);
720
721MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
722MODULE_DESCRIPTION("BlueFRITZ! USB driver ver " VERSION);
723MODULE_VERSION(VERSION);
724MODULE_LICENSE("GPL");
725MODULE_FIRMWARE("bfubase.frm");
1/*
2 *
3 * AVM BlueFRITZ! USB driver
4 *
5 * Copyright (C) 2003-2006 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/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 /* AVM BlueFRITZ! USB */
47 { USB_DEVICE(0x057c, 0x2200) },
48
49 { } /* Terminating entry */
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 = hdev->driver_data;
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 = hdev->driver_data;
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 = hdev->driver_data;
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 = hdev->driver_data;
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 /* Prepend skb with frame type */
501 memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
502
503 count = skb->len;
504
505 /* Max HCI frame size seems to be 1511 + 1 */
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 /* Don't send frame with multiple size of bulk max packet */
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 void bfusb_destruct(struct hci_dev *hdev)
548{
549 struct bfusb_data *data = hdev->driver_data;
550
551 BT_DBG("hdev %p bfusb %p", hdev, data);
552
553 kfree(data);
554}
555
556static int bfusb_ioctl(struct hci_dev *hdev, unsigned int cmd, unsigned long arg)
557{
558 return -ENOIOCTLCMD;
559}
560
561static int bfusb_load_firmware(struct bfusb_data *data,
562 const unsigned char *firmware, int count)
563{
564 unsigned char *buf;
565 int err, pipe, len, size, sent = 0;
566
567 BT_DBG("bfusb %p udev %p", data, data->udev);
568
569 BT_INFO("BlueFRITZ! USB loading firmware");
570
571 pipe = usb_sndctrlpipe(data->udev, 0);
572
573 if (usb_control_msg(data->udev, pipe, USB_REQ_SET_CONFIGURATION,
574 0, 1, 0, NULL, 0, USB_CTRL_SET_TIMEOUT) < 0) {
575 BT_ERR("Can't change to loading configuration");
576 return -EBUSY;
577 }
578
579 data->udev->toggle[0] = data->udev->toggle[1] = 0;
580
581 buf = kmalloc(BFUSB_MAX_BLOCK_SIZE + 3, GFP_ATOMIC);
582 if (!buf) {
583 BT_ERR("Can't allocate memory chunk for firmware");
584 return -ENOMEM;
585 }
586
587 pipe = usb_sndbulkpipe(data->udev, data->bulk_out_ep);
588
589 while (count) {
590 size = min_t(uint, count, BFUSB_MAX_BLOCK_SIZE + 3);
591
592 memcpy(buf, firmware + sent, size);
593
594 err = usb_bulk_msg(data->udev, pipe, buf, size,
595 &len, BFUSB_BLOCK_TIMEOUT);
596
597 if (err || (len != size)) {
598 BT_ERR("Error in firmware loading");
599 goto error;
600 }
601
602 sent += size;
603 count -= size;
604 }
605
606 err = usb_bulk_msg(data->udev, pipe, NULL, 0,
607 &len, BFUSB_BLOCK_TIMEOUT);
608 if (err < 0) {
609 BT_ERR("Error in null packet request");
610 goto error;
611 }
612
613 pipe = usb_sndctrlpipe(data->udev, 0);
614
615 err = usb_control_msg(data->udev, pipe, USB_REQ_SET_CONFIGURATION,
616 0, 2, 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
617 if (err < 0) {
618 BT_ERR("Can't change to running configuration");
619 goto error;
620 }
621
622 data->udev->toggle[0] = data->udev->toggle[1] = 0;
623
624 BT_INFO("BlueFRITZ! USB device ready");
625
626 kfree(buf);
627 return 0;
628
629error:
630 kfree(buf);
631
632 pipe = usb_sndctrlpipe(data->udev, 0);
633
634 usb_control_msg(data->udev, pipe, USB_REQ_SET_CONFIGURATION,
635 0, 0, 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
636
637 return err;
638}
639
640static int bfusb_probe(struct usb_interface *intf, const struct usb_device_id *id)
641{
642 const struct firmware *firmware;
643 struct usb_device *udev = interface_to_usbdev(intf);
644 struct usb_host_endpoint *bulk_out_ep;
645 struct usb_host_endpoint *bulk_in_ep;
646 struct hci_dev *hdev;
647 struct bfusb_data *data;
648
649 BT_DBG("intf %p id %p", intf, id);
650
651 /* Check number of endpoints */
652 if (intf->cur_altsetting->desc.bNumEndpoints < 2)
653 return -EIO;
654
655 bulk_out_ep = &intf->cur_altsetting->endpoint[0];
656 bulk_in_ep = &intf->cur_altsetting->endpoint[1];
657
658 if (!bulk_out_ep || !bulk_in_ep) {
659 BT_ERR("Bulk endpoints not found");
660 goto done;
661 }
662
663 /* Initialize control structure and load firmware */
664 data = kzalloc(sizeof(struct bfusb_data), GFP_KERNEL);
665 if (!data) {
666 BT_ERR("Can't allocate memory for control structure");
667 goto done;
668 }
669
670 data->udev = udev;
671 data->bulk_in_ep = bulk_in_ep->desc.bEndpointAddress;
672 data->bulk_out_ep = bulk_out_ep->desc.bEndpointAddress;
673 data->bulk_pkt_size = le16_to_cpu(bulk_out_ep->desc.wMaxPacketSize);
674
675 rwlock_init(&data->lock);
676
677 data->reassembly = NULL;
678
679 skb_queue_head_init(&data->transmit_q);
680 skb_queue_head_init(&data->pending_q);
681 skb_queue_head_init(&data->completed_q);
682
683 if (request_firmware(&firmware, "bfubase.frm", &udev->dev) < 0) {
684 BT_ERR("Firmware request failed");
685 goto error;
686 }
687
688 BT_DBG("firmware data %p size %zu", firmware->data, firmware->size);
689
690 if (bfusb_load_firmware(data, firmware->data, firmware->size) < 0) {
691 BT_ERR("Firmware loading failed");
692 goto release;
693 }
694
695 release_firmware(firmware);
696
697 /* Initialize and register HCI device */
698 hdev = hci_alloc_dev();
699 if (!hdev) {
700 BT_ERR("Can't allocate HCI device");
701 goto error;
702 }
703
704 data->hdev = hdev;
705
706 hdev->bus = HCI_USB;
707 hdev->driver_data = data;
708 SET_HCIDEV_DEV(hdev, &intf->dev);
709
710 hdev->open = bfusb_open;
711 hdev->close = bfusb_close;
712 hdev->flush = bfusb_flush;
713 hdev->send = bfusb_send_frame;
714 hdev->destruct = bfusb_destruct;
715 hdev->ioctl = bfusb_ioctl;
716
717 hdev->owner = THIS_MODULE;
718
719 if (hci_register_dev(hdev) < 0) {
720 BT_ERR("Can't register HCI device");
721 hci_free_dev(hdev);
722 goto error;
723 }
724
725 usb_set_intfdata(intf, data);
726
727 return 0;
728
729release:
730 release_firmware(firmware);
731
732error:
733 kfree(data);
734
735done:
736 return -EIO;
737}
738
739static void bfusb_disconnect(struct usb_interface *intf)
740{
741 struct bfusb_data *data = usb_get_intfdata(intf);
742 struct hci_dev *hdev = data->hdev;
743
744 BT_DBG("intf %p", intf);
745
746 if (!hdev)
747 return;
748
749 usb_set_intfdata(intf, NULL);
750
751 bfusb_close(hdev);
752
753 if (hci_unregister_dev(hdev) < 0)
754 BT_ERR("Can't unregister HCI device %s", hdev->name);
755
756 hci_free_dev(hdev);
757}
758
759static struct usb_driver bfusb_driver = {
760 .name = "bfusb",
761 .probe = bfusb_probe,
762 .disconnect = bfusb_disconnect,
763 .id_table = bfusb_table,
764};
765
766static int __init bfusb_init(void)
767{
768 int err;
769
770 BT_INFO("BlueFRITZ! USB driver ver %s", VERSION);
771
772 err = usb_register(&bfusb_driver);
773 if (err < 0)
774 BT_ERR("Failed to register BlueFRITZ! USB driver");
775
776 return err;
777}
778
779static void __exit bfusb_exit(void)
780{
781 usb_deregister(&bfusb_driver);
782}
783
784module_init(bfusb_init);
785module_exit(bfusb_exit);
786
787MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
788MODULE_DESCRIPTION("BlueFRITZ! USB driver ver " VERSION);
789MODULE_VERSION(VERSION);
790MODULE_LICENSE("GPL");
791MODULE_FIRMWARE("bfubase.frm");