[Bluetooth] Fix USB disconnect handling of btusb driver
[linux-2.6.git] / drivers / bluetooth / bpa10x.c
1 /*
2  *
3  *  Digianswer Bluetooth USB driver
4  *
5  *  Copyright (C) 2004-2007  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/kernel.h>
25 #include <linux/module.h>
26 #include <linux/init.h>
27 #include <linux/slab.h>
28 #include <linux/types.h>
29 #include <linux/sched.h>
30 #include <linux/errno.h>
31 #include <linux/skbuff.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 "0.10"
44
45 static struct usb_device_id bpa10x_table[] = {
46         /* Tektronix BPA 100/105 (Digianswer) */
47         { USB_DEVICE(0x08fd, 0x0002) },
48
49         { }     /* Terminating entry */
50 };
51
52 MODULE_DEVICE_TABLE(usb, bpa10x_table);
53
54 struct bpa10x_data {
55         struct hci_dev    *hdev;
56         struct usb_device *udev;
57
58         struct usb_anchor tx_anchor;
59         struct usb_anchor rx_anchor;
60
61         struct sk_buff *rx_skb[2];
62 };
63
64 #define HCI_VENDOR_HDR_SIZE 5
65
66 struct hci_vendor_hdr {
67         __u8    type;
68         __le16  snum;
69         __le16  dlen;
70 } __attribute__ ((packed));
71
72 static int bpa10x_recv(struct hci_dev *hdev, int queue, void *buf, int count)
73 {
74         struct bpa10x_data *data = hdev->driver_data;
75
76         BT_DBG("%s queue %d buffer %p count %d", hdev->name,
77                                                         queue, buf, count);
78
79         if (queue < 0 || queue > 1)
80                 return -EILSEQ;
81
82         hdev->stat.byte_rx += count;
83
84         while (count) {
85                 struct sk_buff *skb = data->rx_skb[queue];
86                 struct { __u8 type; int expect; } *scb;
87                 int type, len = 0;
88
89                 if (!skb) {
90                         /* Start of the frame */
91
92                         type = *((__u8 *) buf);
93                         count--; buf++;
94
95                         switch (type) {
96                         case HCI_EVENT_PKT:
97                                 if (count >= HCI_EVENT_HDR_SIZE) {
98                                         struct hci_event_hdr *h = buf;
99                                         len = HCI_EVENT_HDR_SIZE + h->plen;
100                                 } else
101                                         return -EILSEQ;
102                                 break;
103
104                         case HCI_ACLDATA_PKT:
105                                 if (count >= HCI_ACL_HDR_SIZE) {
106                                         struct hci_acl_hdr *h = buf;
107                                         len = HCI_ACL_HDR_SIZE +
108                                                         __le16_to_cpu(h->dlen);
109                                 } else
110                                         return -EILSEQ;
111                                 break;
112
113                         case HCI_SCODATA_PKT:
114                                 if (count >= HCI_SCO_HDR_SIZE) {
115                                         struct hci_sco_hdr *h = buf;
116                                         len = HCI_SCO_HDR_SIZE + h->dlen;
117                                 } else
118                                         return -EILSEQ;
119                                 break;
120
121                         case HCI_VENDOR_PKT:
122                                 if (count >= HCI_VENDOR_HDR_SIZE) {
123                                         struct hci_vendor_hdr *h = buf;
124                                         len = HCI_VENDOR_HDR_SIZE +
125                                                         __le16_to_cpu(h->dlen);
126                                 } else
127                                         return -EILSEQ;
128                                 break;
129                         }
130
131                         skb = bt_skb_alloc(len, GFP_ATOMIC);
132                         if (!skb) {
133                                 BT_ERR("%s no memory for packet", hdev->name);
134                                 return -ENOMEM;
135                         }
136
137                         skb->dev = (void *) hdev;
138
139                         data->rx_skb[queue] = skb;
140
141                         scb = (void *) skb->cb;
142                         scb->type = type;
143                         scb->expect = len;
144                 } else {
145                         /* Continuation */
146
147                         scb = (void *) skb->cb;
148                         len = scb->expect;
149                 }
150
151                 len = min(len, count);
152
153                 memcpy(skb_put(skb, len), buf, len);
154
155                 scb->expect -= len;
156
157                 if (scb->expect == 0) {
158                         /* Complete frame */
159
160                         data->rx_skb[queue] = NULL;
161
162                         bt_cb(skb)->pkt_type = scb->type;
163                         hci_recv_frame(skb);
164                 }
165
166                 count -= len; buf += len;
167         }
168
169         return 0;
170 }
171
172 static void bpa10x_tx_complete(struct urb *urb)
173 {
174         struct sk_buff *skb = urb->context;
175         struct hci_dev *hdev = (struct hci_dev *) skb->dev;
176
177         BT_DBG("%s urb %p status %d count %d", hdev->name,
178                                         urb, urb->status, urb->actual_length);
179
180         if (!test_bit(HCI_RUNNING, &hdev->flags))
181                 goto done;
182
183         if (!urb->status)
184                 hdev->stat.byte_tx += urb->transfer_buffer_length;
185         else
186                 hdev->stat.err_tx++;
187
188 done:
189         kfree(urb->setup_packet);
190
191         kfree_skb(skb);
192 }
193
194 static void bpa10x_rx_complete(struct urb *urb)
195 {
196         struct hci_dev *hdev = urb->context;
197         struct bpa10x_data *data = hdev->driver_data;
198         int err;
199
200         BT_DBG("%s urb %p status %d count %d", hdev->name,
201                                         urb, urb->status, urb->actual_length);
202
203         if (!test_bit(HCI_RUNNING, &hdev->flags))
204                 return;
205
206         if (urb->status == 0) {
207                 if (bpa10x_recv(hdev, usb_pipebulk(urb->pipe),
208                                                 urb->transfer_buffer,
209                                                 urb->actual_length) < 0) {
210                         BT_ERR("%s corrupted event packet", hdev->name);
211                         hdev->stat.err_rx++;
212                 }
213         }
214
215         usb_anchor_urb(urb, &data->rx_anchor);
216
217         err = usb_submit_urb(urb, GFP_ATOMIC);
218         if (err < 0) {
219                 BT_ERR("%s urb %p failed to resubmit (%d)",
220                                                 hdev->name, urb, -err);
221                 usb_unanchor_urb(urb);
222         }
223 }
224
225 static inline int bpa10x_submit_intr_urb(struct hci_dev *hdev)
226 {
227         struct bpa10x_data *data = hdev->driver_data;
228         struct urb *urb;
229         unsigned char *buf;
230         unsigned int pipe;
231         int err, size = 16;
232
233         BT_DBG("%s", hdev->name);
234
235         urb = usb_alloc_urb(0, GFP_KERNEL);
236         if (!urb)
237                 return -ENOMEM;
238
239         buf = kmalloc(size, GFP_KERNEL);
240         if (!buf) {
241                 usb_free_urb(urb);
242                 return -ENOMEM;
243         }
244
245         pipe = usb_rcvintpipe(data->udev, 0x81);
246
247         usb_fill_int_urb(urb, data->udev, pipe, buf, size,
248                                                 bpa10x_rx_complete, hdev, 1);
249
250         urb->transfer_flags |= URB_FREE_BUFFER;
251
252         usb_anchor_urb(urb, &data->rx_anchor);
253
254         err = usb_submit_urb(urb, GFP_KERNEL);
255         if (err < 0) {
256                 BT_ERR("%s urb %p submission failed (%d)",
257                                                 hdev->name, urb, -err);
258                 usb_unanchor_urb(urb);
259                 kfree(buf);
260         }
261
262         usb_free_urb(urb);
263
264         return err;
265 }
266
267 static inline int bpa10x_submit_bulk_urb(struct hci_dev *hdev)
268 {
269         struct bpa10x_data *data = hdev->driver_data;
270         struct urb *urb;
271         unsigned char *buf;
272         unsigned int pipe;
273         int err, size = 64;
274
275         BT_DBG("%s", hdev->name);
276
277         urb = usb_alloc_urb(0, GFP_KERNEL);
278         if (!urb)
279                 return -ENOMEM;
280
281         buf = kmalloc(size, GFP_KERNEL);
282         if (!buf) {
283                 usb_free_urb(urb);
284                 return -ENOMEM;
285         }
286
287         pipe = usb_rcvbulkpipe(data->udev, 0x82);
288
289         usb_fill_bulk_urb(urb, data->udev, pipe,
290                                         buf, size, bpa10x_rx_complete, hdev);
291
292         urb->transfer_flags |= URB_FREE_BUFFER;
293
294         usb_anchor_urb(urb, &data->rx_anchor);
295
296         err = usb_submit_urb(urb, GFP_KERNEL);
297         if (err < 0) {
298                 BT_ERR("%s urb %p submission failed (%d)",
299                                                 hdev->name, urb, -err);
300                 usb_unanchor_urb(urb);
301                 kfree(buf);
302         }
303
304         usb_free_urb(urb);
305
306         return err;
307 }
308
309 static int bpa10x_open(struct hci_dev *hdev)
310 {
311         struct bpa10x_data *data = hdev->driver_data;
312         int err;
313
314         BT_DBG("%s", hdev->name);
315
316         if (test_and_set_bit(HCI_RUNNING, &hdev->flags))
317                 return 0;
318
319         err = bpa10x_submit_intr_urb(hdev);
320         if (err < 0)
321                 goto error;
322
323         err = bpa10x_submit_bulk_urb(hdev);
324         if (err < 0)
325                 goto error;
326
327         return 0;
328
329 error:
330         usb_kill_anchored_urbs(&data->rx_anchor);
331
332         clear_bit(HCI_RUNNING, &hdev->flags);
333
334         return err;
335 }
336
337 static int bpa10x_close(struct hci_dev *hdev)
338 {
339         struct bpa10x_data *data = hdev->driver_data;
340
341         BT_DBG("%s", hdev->name);
342
343         if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
344                 return 0;
345
346         usb_kill_anchored_urbs(&data->rx_anchor);
347
348         return 0;
349 }
350
351 static int bpa10x_flush(struct hci_dev *hdev)
352 {
353         struct bpa10x_data *data = hdev->driver_data;
354
355         BT_DBG("%s", hdev->name);
356
357         usb_kill_anchored_urbs(&data->tx_anchor);
358
359         return 0;
360 }
361
362 static int bpa10x_send_frame(struct sk_buff *skb)
363 {
364         struct hci_dev *hdev = (struct hci_dev *) skb->dev;
365         struct bpa10x_data *data = hdev->driver_data;
366         struct usb_ctrlrequest *dr;
367         struct urb *urb;
368         unsigned int pipe;
369         int err;
370
371         BT_DBG("%s", hdev->name);
372
373         if (!test_bit(HCI_RUNNING, &hdev->flags))
374                 return -EBUSY;
375
376         urb = usb_alloc_urb(0, GFP_ATOMIC);
377         if (!urb)
378                 return -ENOMEM;
379
380         /* Prepend skb with frame type */
381         *skb_push(skb, 1) = bt_cb(skb)->pkt_type;
382
383         switch (bt_cb(skb)->pkt_type) {
384         case HCI_COMMAND_PKT:
385                 dr = kmalloc(sizeof(*dr), GFP_ATOMIC);
386                 if (!dr) {
387                         usb_free_urb(urb);
388                         return -ENOMEM;
389                 }
390
391                 dr->bRequestType = USB_TYPE_VENDOR;
392                 dr->bRequest     = 0;
393                 dr->wIndex       = 0;
394                 dr->wValue       = 0;
395                 dr->wLength      = __cpu_to_le16(skb->len);
396
397                 pipe = usb_sndctrlpipe(data->udev, 0x00);
398
399                 usb_fill_control_urb(urb, data->udev, pipe, (void *) dr,
400                                 skb->data, skb->len, bpa10x_tx_complete, skb);
401
402                 hdev->stat.cmd_tx++;
403                 break;
404
405         case HCI_ACLDATA_PKT:
406                 pipe = usb_sndbulkpipe(data->udev, 0x02);
407
408                 usb_fill_bulk_urb(urb, data->udev, pipe,
409                                 skb->data, skb->len, bpa10x_tx_complete, skb);
410
411                 hdev->stat.acl_tx++;
412                 break;
413
414         case HCI_SCODATA_PKT:
415                 pipe = usb_sndbulkpipe(data->udev, 0x02);
416
417                 usb_fill_bulk_urb(urb, data->udev, pipe,
418                                 skb->data, skb->len, bpa10x_tx_complete, skb);
419
420                 hdev->stat.sco_tx++;
421                 break;
422
423         default:
424                 usb_free_urb(urb);
425                 return -EILSEQ;
426         }
427
428         usb_anchor_urb(urb, &data->tx_anchor);
429
430         err = usb_submit_urb(urb, GFP_ATOMIC);
431         if (err < 0) {
432                 BT_ERR("%s urb %p submission failed", hdev->name, urb);
433                 kfree(urb->setup_packet);
434                 usb_unanchor_urb(urb);
435         }
436
437         usb_free_urb(urb);
438
439         return 0;
440 }
441
442 static void bpa10x_destruct(struct hci_dev *hdev)
443 {
444         struct bpa10x_data *data = hdev->driver_data;
445
446         BT_DBG("%s", hdev->name);
447
448         kfree(data->rx_skb[0]);
449         kfree(data->rx_skb[1]);
450         kfree(data);
451 }
452
453 static int bpa10x_probe(struct usb_interface *intf, const struct usb_device_id *id)
454 {
455         struct bpa10x_data *data;
456         struct hci_dev *hdev;
457         int err;
458
459         BT_DBG("intf %p id %p", intf, id);
460
461         if (intf->cur_altsetting->desc.bInterfaceNumber != 0)
462                 return -ENODEV;
463
464         data = kzalloc(sizeof(*data), GFP_KERNEL);
465         if (!data)
466                 return -ENOMEM;
467
468         data->udev = interface_to_usbdev(intf);
469
470         init_usb_anchor(&data->tx_anchor);
471         init_usb_anchor(&data->rx_anchor);
472
473         hdev = hci_alloc_dev();
474         if (!hdev) {
475                 kfree(data);
476                 return -ENOMEM;
477         }
478
479         hdev->type = HCI_USB;
480         hdev->driver_data = data;
481
482         data->hdev = hdev;
483
484         SET_HCIDEV_DEV(hdev, &intf->dev);
485
486         hdev->open     = bpa10x_open;
487         hdev->close    = bpa10x_close;
488         hdev->flush    = bpa10x_flush;
489         hdev->send     = bpa10x_send_frame;
490         hdev->destruct = bpa10x_destruct;
491
492         hdev->owner = THIS_MODULE;
493
494         err = hci_register_dev(hdev);
495         if (err < 0) {
496                 hci_free_dev(hdev);
497                 kfree(data);
498                 return err;
499         }
500
501         usb_set_intfdata(intf, data);
502
503         return 0;
504 }
505
506 static void bpa10x_disconnect(struct usb_interface *intf)
507 {
508         struct bpa10x_data *data = usb_get_intfdata(intf);
509
510         BT_DBG("intf %p", intf);
511
512         if (!data)
513                 return;
514
515         usb_set_intfdata(intf, NULL);
516
517         hci_unregister_dev(data->hdev);
518
519         hci_free_dev(data->hdev);
520 }
521
522 static struct usb_driver bpa10x_driver = {
523         .name           = "bpa10x",
524         .probe          = bpa10x_probe,
525         .disconnect     = bpa10x_disconnect,
526         .id_table       = bpa10x_table,
527 };
528
529 static int __init bpa10x_init(void)
530 {
531         BT_INFO("Digianswer Bluetooth USB driver ver %s", VERSION);
532
533         return usb_register(&bpa10x_driver);
534 }
535
536 static void __exit bpa10x_exit(void)
537 {
538         usb_deregister(&bpa10x_driver);
539 }
540
541 module_init(bpa10x_init);
542 module_exit(bpa10x_exit);
543
544 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
545 MODULE_DESCRIPTION("Digianswer Bluetooth USB driver ver " VERSION);
546 MODULE_VERSION(VERSION);
547 MODULE_LICENSE("GPL");