Root/drivers/bluetooth/bfusb.c

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 = 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    /* 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 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    /* Check number of endpoints */
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    /* Initialize control structure and load firmware */
656    data = kzalloc(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 error;
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    /* Initialize and register HCI device */
690    hdev = hci_alloc_dev();
691    if (!hdev) {
692        BT_ERR("Can't allocate HCI device");
693        goto error;
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 error;
712    }
713
714    usb_set_intfdata(intf, data);
715
716    return 0;
717
718release:
719    release_firmware(firmware);
720
721error:
722    kfree(data);
723
724done:
725    return -EIO;
726}
727
728static void bfusb_disconnect(struct usb_interface *intf)
729{
730    struct bfusb_data *data = usb_get_intfdata(intf);
731    struct hci_dev *hdev = data->hdev;
732
733    BT_DBG("intf %p", intf);
734
735    if (!hdev)
736        return;
737
738    usb_set_intfdata(intf, NULL);
739
740    bfusb_close(hdev);
741
742    hci_unregister_dev(hdev);
743    hci_free_dev(hdev);
744    kfree(data);
745}
746
747static struct usb_driver bfusb_driver = {
748    .name = "bfusb",
749    .probe = bfusb_probe,
750    .disconnect = bfusb_disconnect,
751    .id_table = bfusb_table,
752    .disable_hub_initiated_lpm = 1,
753};
754
755module_usb_driver(bfusb_driver);
756
757MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
758MODULE_DESCRIPTION("BlueFRITZ! USB driver ver " VERSION);
759MODULE_VERSION(VERSION);
760MODULE_LICENSE("GPL");
761MODULE_FIRMWARE("bfubase.frm");
762

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