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IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / bluetooth / bpa10x.c
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/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
32 #include <linux/usb.h>
33
34 #include <net/bluetooth/bluetooth.h>
35 #include <net/bluetooth/hci_core.h>
36
37 #ifndef CONFIG_BT_HCIBPA10X_DEBUG
38 #undef BT_DBG
39 #define BT_DBG(D...)
40 #endif
41
42 #define VERSION "0.8"
43
44 static int ignore = 0;
45
46 static struct usb_device_id bpa10x_table[] = {
47 /* Tektronix BPA 100/105 (Digianswer) */
48 { USB_DEVICE(0x08fd, 0x0002) },
49
50 { } /* Terminating entry */
51 };
52
53 MODULE_DEVICE_TABLE(usb, bpa10x_table);
54
55 #define BPA10X_CMD_EP 0x00
56 #define BPA10X_EVT_EP 0x81
57 #define BPA10X_TX_EP 0x02
58 #define BPA10X_RX_EP 0x82
59
60 #define BPA10X_CMD_BUF_SIZE 252
61 #define BPA10X_EVT_BUF_SIZE 16
62 #define BPA10X_TX_BUF_SIZE 384
63 #define BPA10X_RX_BUF_SIZE 384
64
65 struct bpa10x_data {
66 struct hci_dev *hdev;
67 struct usb_device *udev;
68
69 rwlock_t lock;
70
71 struct sk_buff_head cmd_queue;
72 struct urb *cmd_urb;
73 struct urb *evt_urb;
74 struct sk_buff *evt_skb;
75 unsigned int evt_len;
76
77 struct sk_buff_head tx_queue;
78 struct urb *tx_urb;
79 struct urb *rx_urb;
80 };
81
82 #define HCI_VENDOR_HDR_SIZE 5
83
84 struct hci_vendor_hdr {
85 __u8 type;
86 __le16 snum;
87 __le16 dlen;
88 } __attribute__ ((packed));
89
90 static void bpa10x_recv_bulk(struct bpa10x_data *data, unsigned char *buf, int count)
91 {
92 struct hci_acl_hdr *ah;
93 struct hci_sco_hdr *sh;
94 struct hci_vendor_hdr *vh;
95 struct sk_buff *skb;
96 int len;
97
98 while (count) {
99 switch (*buf++) {
100 case HCI_ACLDATA_PKT:
101 ah = (struct hci_acl_hdr *) buf;
102 len = HCI_ACL_HDR_SIZE + __le16_to_cpu(ah->dlen);
103 skb = bt_skb_alloc(len, GFP_ATOMIC);
104 if (skb) {
105 memcpy(skb_put(skb, len), buf, len);
106 skb->dev = (void *) data->hdev;
107 bt_cb(skb)->pkt_type = HCI_ACLDATA_PKT;
108 hci_recv_frame(skb);
109 }
110 break;
111
112 case HCI_SCODATA_PKT:
113 sh = (struct hci_sco_hdr *) buf;
114 len = HCI_SCO_HDR_SIZE + sh->dlen;
115 skb = bt_skb_alloc(len, GFP_ATOMIC);
116 if (skb) {
117 memcpy(skb_put(skb, len), buf, len);
118 skb->dev = (void *) data->hdev;
119 bt_cb(skb)->pkt_type = HCI_SCODATA_PKT;
120 hci_recv_frame(skb);
121 }
122 break;
123
124 case HCI_VENDOR_PKT:
125 vh = (struct hci_vendor_hdr *) buf;
126 len = HCI_VENDOR_HDR_SIZE + __le16_to_cpu(vh->dlen);
127 skb = bt_skb_alloc(len, GFP_ATOMIC);
128 if (skb) {
129 memcpy(skb_put(skb, len), buf, len);
130 skb->dev = (void *) data->hdev;
131 bt_cb(skb)->pkt_type = HCI_VENDOR_PKT;
132 hci_recv_frame(skb);
133 }
134 break;
135
136 default:
137 len = count - 1;
138 break;
139 }
140
141 buf += len;
142 count -= (len + 1);
143 }
144 }
145
146 static int bpa10x_recv_event(struct bpa10x_data *data, unsigned char *buf, int size)
147 {
148 BT_DBG("data %p buf %p size %d", data, buf, size);
149
150 if (data->evt_skb) {
151 struct sk_buff *skb = data->evt_skb;
152
153 memcpy(skb_put(skb, size), buf, size);
154
155 if (skb->len == data->evt_len) {
156 data->evt_skb = NULL;
157 data->evt_len = 0;
158 hci_recv_frame(skb);
159 }
160 } else {
161 struct sk_buff *skb;
162 struct hci_event_hdr *hdr;
163 unsigned char pkt_type;
164 int pkt_len = 0;
165
166 if (size < HCI_EVENT_HDR_SIZE + 1) {
167 BT_ERR("%s event packet block with size %d is too short",
168 data->hdev->name, size);
169 return -EILSEQ;
170 }
171
172 pkt_type = *buf++;
173 size--;
174
175 if (pkt_type != HCI_EVENT_PKT) {
176 BT_ERR("%s unexpected event packet start byte 0x%02x",
177 data->hdev->name, pkt_type);
178 return -EPROTO;
179 }
180
181 hdr = (struct hci_event_hdr *) buf;
182 pkt_len = HCI_EVENT_HDR_SIZE + hdr->plen;
183
184 skb = bt_skb_alloc(pkt_len, GFP_ATOMIC);
185 if (!skb) {
186 BT_ERR("%s no memory for new event packet",
187 data->hdev->name);
188 return -ENOMEM;
189 }
190
191 skb->dev = (void *) data->hdev;
192 bt_cb(skb)->pkt_type = pkt_type;
193
194 memcpy(skb_put(skb, size), buf, size);
195
196 if (pkt_len == size) {
197 hci_recv_frame(skb);
198 } else {
199 data->evt_skb = skb;
200 data->evt_len = pkt_len;
201 }
202 }
203
204 return 0;
205 }
206
207 static void bpa10x_wakeup(struct bpa10x_data *data)
208 {
209 struct urb *urb;
210 struct sk_buff *skb;
211 int err;
212
213 BT_DBG("data %p", data);
214
215 urb = data->cmd_urb;
216 if (urb->status == -EINPROGRESS)
217 skb = NULL;
218 else
219 skb = skb_dequeue(&data->cmd_queue);
220
221 if (skb) {
222 struct usb_ctrlrequest *cr;
223
224 if (skb->len > BPA10X_CMD_BUF_SIZE) {
225 BT_ERR("%s command packet with size %d is too big",
226 data->hdev->name, skb->len);
227 kfree_skb(skb);
228 return;
229 }
230
231 cr = (struct usb_ctrlrequest *) urb->setup_packet;
232 cr->wLength = __cpu_to_le16(skb->len);
233
234 memcpy(urb->transfer_buffer, skb->data, skb->len);
235 urb->transfer_buffer_length = skb->len;
236
237 err = usb_submit_urb(urb, GFP_ATOMIC);
238 if (err < 0 && err != -ENODEV) {
239 BT_ERR("%s submit failed for command urb %p with error %d",
240 data->hdev->name, urb, err);
241 skb_queue_head(&data->cmd_queue, skb);
242 } else
243 kfree_skb(skb);
244 }
245
246 urb = data->tx_urb;
247 if (urb->status == -EINPROGRESS)
248 skb = NULL;
249 else
250 skb = skb_dequeue(&data->tx_queue);
251
252 if (skb) {
253 memcpy(urb->transfer_buffer, skb->data, skb->len);
254 urb->transfer_buffer_length = skb->len;
255
256 err = usb_submit_urb(urb, GFP_ATOMIC);
257 if (err < 0 && err != -ENODEV) {
258 BT_ERR("%s submit failed for command urb %p with error %d",
259 data->hdev->name, urb, err);
260 skb_queue_head(&data->tx_queue, skb);
261 } else
262 kfree_skb(skb);
263 }
264 }
265
266 static void bpa10x_complete(struct urb *urb)
267 {
268 struct bpa10x_data *data = urb->context;
269 unsigned char *buf = urb->transfer_buffer;
270 int err, count = urb->actual_length;
271
272 BT_DBG("data %p urb %p buf %p count %d", data, urb, buf, count);
273
274 read_lock(&data->lock);
275
276 if (!test_bit(HCI_RUNNING, &data->hdev->flags))
277 goto unlock;
278
279 if (urb->status < 0 || !count)
280 goto resubmit;
281
282 if (usb_pipein(urb->pipe)) {
283 data->hdev->stat.byte_rx += count;
284
285 if (usb_pipetype(urb->pipe) == PIPE_INTERRUPT)
286 bpa10x_recv_event(data, buf, count);
287
288 if (usb_pipetype(urb->pipe) == PIPE_BULK)
289 bpa10x_recv_bulk(data, buf, count);
290 } else {
291 data->hdev->stat.byte_tx += count;
292
293 bpa10x_wakeup(data);
294 }
295
296 resubmit:
297 if (usb_pipein(urb->pipe)) {
298 err = usb_submit_urb(urb, GFP_ATOMIC);
299 if (err < 0 && err != -ENODEV) {
300 BT_ERR("%s urb %p type %d resubmit status %d",
301 data->hdev->name, urb, usb_pipetype(urb->pipe), err);
302 }
303 }
304
305 unlock:
306 read_unlock(&data->lock);
307 }
308
309 static inline struct urb *bpa10x_alloc_urb(struct usb_device *udev, unsigned int pipe,
310 size_t size, gfp_t flags, void *data)
311 {
312 struct urb *urb;
313 struct usb_ctrlrequest *cr;
314 unsigned char *buf;
315
316 BT_DBG("udev %p data %p", udev, data);
317
318 urb = usb_alloc_urb(0, flags);
319 if (!urb)
320 return NULL;
321
322 buf = kmalloc(size, flags);
323 if (!buf) {
324 usb_free_urb(urb);
325 return NULL;
326 }
327
328 switch (usb_pipetype(pipe)) {
329 case PIPE_CONTROL:
330 cr = kmalloc(sizeof(*cr), flags);
331 if (!cr) {
332 kfree(buf);
333 usb_free_urb(urb);
334 return NULL;
335 }
336
337 cr->bRequestType = USB_TYPE_VENDOR;
338 cr->bRequest = 0;
339 cr->wIndex = 0;
340 cr->wValue = 0;
341 cr->wLength = __cpu_to_le16(0);
342
343 usb_fill_control_urb(urb, udev, pipe, (void *) cr, buf, 0, bpa10x_complete, data);
344 break;
345
346 case PIPE_INTERRUPT:
347 usb_fill_int_urb(urb, udev, pipe, buf, size, bpa10x_complete, data, 1);
348 break;
349
350 case PIPE_BULK:
351 usb_fill_bulk_urb(urb, udev, pipe, buf, size, bpa10x_complete, data);
352 break;
353
354 default:
355 kfree(buf);
356 usb_free_urb(urb);
357 return NULL;
358 }
359
360 return urb;
361 }
362
363 static inline void bpa10x_free_urb(struct urb *urb)
364 {
365 BT_DBG("urb %p", urb);
366
367 if (!urb)
368 return;
369
370 kfree(urb->setup_packet);
371 kfree(urb->transfer_buffer);
372
373 usb_free_urb(urb);
374 }
375
376 static int bpa10x_open(struct hci_dev *hdev)
377 {
378 struct bpa10x_data *data = hdev->driver_data;
379 struct usb_device *udev = data->udev;
380 unsigned long flags;
381 int err;
382
383 BT_DBG("hdev %p data %p", hdev, data);
384
385 if (test_and_set_bit(HCI_RUNNING, &hdev->flags))
386 return 0;
387
388 data->cmd_urb = bpa10x_alloc_urb(udev, usb_sndctrlpipe(udev, BPA10X_CMD_EP),
389 BPA10X_CMD_BUF_SIZE, GFP_KERNEL, data);
390 if (!data->cmd_urb) {
391 err = -ENOMEM;
392 goto done;
393 }
394
395 data->evt_urb = bpa10x_alloc_urb(udev, usb_rcvintpipe(udev, BPA10X_EVT_EP),
396 BPA10X_EVT_BUF_SIZE, GFP_KERNEL, data);
397 if (!data->evt_urb) {
398 bpa10x_free_urb(data->cmd_urb);
399 err = -ENOMEM;
400 goto done;
401 }
402
403 data->rx_urb = bpa10x_alloc_urb(udev, usb_rcvbulkpipe(udev, BPA10X_RX_EP),
404 BPA10X_RX_BUF_SIZE, GFP_KERNEL, data);
405 if (!data->rx_urb) {
406 bpa10x_free_urb(data->evt_urb);
407 bpa10x_free_urb(data->cmd_urb);
408 err = -ENOMEM;
409 goto done;
410 }
411
412 data->tx_urb = bpa10x_alloc_urb(udev, usb_sndbulkpipe(udev, BPA10X_TX_EP),
413 BPA10X_TX_BUF_SIZE, GFP_KERNEL, data);
414 if (!data->rx_urb) {
415 bpa10x_free_urb(data->rx_urb);
416 bpa10x_free_urb(data->evt_urb);
417 bpa10x_free_urb(data->cmd_urb);
418 err = -ENOMEM;
419 goto done;
420 }
421
422 write_lock_irqsave(&data->lock, flags);
423
424 err = usb_submit_urb(data->evt_urb, GFP_ATOMIC);
425 if (err < 0) {
426 BT_ERR("%s submit failed for event urb %p with error %d",
427 data->hdev->name, data->evt_urb, err);
428 } else {
429 err = usb_submit_urb(data->rx_urb, GFP_ATOMIC);
430 if (err < 0) {
431 BT_ERR("%s submit failed for rx urb %p with error %d",
432 data->hdev->name, data->evt_urb, err);
433 usb_kill_urb(data->evt_urb);
434 }
435 }
436
437 write_unlock_irqrestore(&data->lock, flags);
438
439 done:
440 if (err < 0)
441 clear_bit(HCI_RUNNING, &hdev->flags);
442
443 return err;
444 }
445
446 static int bpa10x_close(struct hci_dev *hdev)
447 {
448 struct bpa10x_data *data = hdev->driver_data;
449 unsigned long flags;
450
451 BT_DBG("hdev %p data %p", hdev, data);
452
453 if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
454 return 0;
455
456 write_lock_irqsave(&data->lock, flags);
457
458 skb_queue_purge(&data->cmd_queue);
459 usb_kill_urb(data->cmd_urb);
460 usb_kill_urb(data->evt_urb);
461 usb_kill_urb(data->rx_urb);
462 usb_kill_urb(data->tx_urb);
463
464 write_unlock_irqrestore(&data->lock, flags);
465
466 bpa10x_free_urb(data->cmd_urb);
467 bpa10x_free_urb(data->evt_urb);
468 bpa10x_free_urb(data->rx_urb);
469 bpa10x_free_urb(data->tx_urb);
470
471 return 0;
472 }
473
474 static int bpa10x_flush(struct hci_dev *hdev)
475 {
476 struct bpa10x_data *data = hdev->driver_data;
477
478 BT_DBG("hdev %p data %p", hdev, data);
479
480 skb_queue_purge(&data->cmd_queue);
481
482 return 0;
483 }
484
485 static int bpa10x_send_frame(struct sk_buff *skb)
486 {
487 struct hci_dev *hdev = (struct hci_dev *) skb->dev;
488 struct bpa10x_data *data;
489
490 BT_DBG("hdev %p skb %p type %d len %d", hdev, skb, bt_cb(skb)->pkt_type, skb->len);
491
492 if (!hdev) {
493 BT_ERR("Frame for unknown HCI device");
494 return -ENODEV;
495 }
496
497 if (!test_bit(HCI_RUNNING, &hdev->flags))
498 return -EBUSY;
499
500 data = hdev->driver_data;
501
502 /* Prepend skb with frame type */
503 memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
504
505 switch (bt_cb(skb)->pkt_type) {
506 case HCI_COMMAND_PKT:
507 hdev->stat.cmd_tx++;
508 skb_queue_tail(&data->cmd_queue, skb);
509 break;
510
511 case HCI_ACLDATA_PKT:
512 hdev->stat.acl_tx++;
513 skb_queue_tail(&data->tx_queue, skb);
514 break;
515
516 case HCI_SCODATA_PKT:
517 hdev->stat.sco_tx++;
518 skb_queue_tail(&data->tx_queue, skb);
519 break;
520 };
521
522 read_lock(&data->lock);
523
524 bpa10x_wakeup(data);
525
526 read_unlock(&data->lock);
527
528 return 0;
529 }
530
531 static void bpa10x_destruct(struct hci_dev *hdev)
532 {
533 struct bpa10x_data *data = hdev->driver_data;
534
535 BT_DBG("hdev %p data %p", hdev, data);
536
537 kfree(data);
538 }
539
540 static int bpa10x_probe(struct usb_interface *intf, const struct usb_device_id *id)
541 {
542 struct usb_device *udev = interface_to_usbdev(intf);
543 struct hci_dev *hdev;
544 struct bpa10x_data *data;
545 int err;
546
547 BT_DBG("intf %p id %p", intf, id);
548
549 if (ignore)
550 return -ENODEV;
551
552 if (intf->cur_altsetting->desc.bInterfaceNumber > 0)
553 return -ENODEV;
554
555 data = kzalloc(sizeof(*data), GFP_KERNEL);
556 if (!data) {
557 BT_ERR("Can't allocate data structure");
558 return -ENOMEM;
559 }
560
561 data->udev = udev;
562
563 rwlock_init(&data->lock);
564
565 skb_queue_head_init(&data->cmd_queue);
566 skb_queue_head_init(&data->tx_queue);
567
568 hdev = hci_alloc_dev();
569 if (!hdev) {
570 BT_ERR("Can't allocate HCI device");
571 kfree(data);
572 return -ENOMEM;
573 }
574
575 data->hdev = hdev;
576
577 hdev->type = HCI_USB;
578 hdev->driver_data = data;
579 SET_HCIDEV_DEV(hdev, &intf->dev);
580
581 hdev->open = bpa10x_open;
582 hdev->close = bpa10x_close;
583 hdev->flush = bpa10x_flush;
584 hdev->send = bpa10x_send_frame;
585 hdev->destruct = bpa10x_destruct;
586
587 hdev->owner = THIS_MODULE;
588
589 err = hci_register_dev(hdev);
590 if (err < 0) {
591 BT_ERR("Can't register HCI device");
592 kfree(data);
593 hci_free_dev(hdev);
594 return err;
595 }
596
597 usb_set_intfdata(intf, data);
598
599 return 0;
600 }
601
602 static void bpa10x_disconnect(struct usb_interface *intf)
603 {
604 struct bpa10x_data *data = usb_get_intfdata(intf);
605 struct hci_dev *hdev = data->hdev;
606
607 BT_DBG("intf %p", intf);
608
609 if (!hdev)
610 return;
611
612 usb_set_intfdata(intf, NULL);
613
614 if (hci_unregister_dev(hdev) < 0)
615 BT_ERR("Can't unregister HCI device %s", hdev->name);
616
617 hci_free_dev(hdev);
618 }
619
620 static struct usb_driver bpa10x_driver = {
621 .name = "bpa10x",
622 .probe = bpa10x_probe,
623 .disconnect = bpa10x_disconnect,
624 .id_table = bpa10x_table,
625 };
626
627 static int __init bpa10x_init(void)
628 {
629 int err;
630
631 BT_INFO("Digianswer Bluetooth USB driver ver %s", VERSION);
632
633 err = usb_register(&bpa10x_driver);
634 if (err < 0)
635 BT_ERR("Failed to register USB driver");
636
637 return err;
638 }
639
640 static void __exit bpa10x_exit(void)
641 {
642 usb_deregister(&bpa10x_driver);
643 }
644
645 module_init(bpa10x_init);
646 module_exit(bpa10x_exit);
647
648 module_param(ignore, bool, 0644);
649 MODULE_PARM_DESC(ignore, "Ignore devices from the matching table");
650
651 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
652 MODULE_DESCRIPTION("Digianswer Bluetooth USB driver ver " VERSION);
653 MODULE_VERSION(VERSION);
654 MODULE_LICENSE("GPL");
kernel source for telekom puls (alcatel/mediatek)