linux/drivers/bluetooth/bfusb.c
Marcel Holtmann 0d48d93947 [Bluetooth]: Move packet type into the SKB control buffer
This patch moves the usage of packet type into the SKB control
buffer. After this patch it is now possible to shrink the sk_buff
structure and redefine its pkt_type.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-29 15:55:13 -07:00

807 lines
17 KiB
C

/*
*
* AVM BlueFRITZ! USB driver
*
* Copyright (C) 2003 Marcel Holtmann <marcel@holtmann.org>
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/skbuff.h>
#include <linux/device.h>
#include <linux/firmware.h>
#include <linux/usb.h>
#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
#ifndef CONFIG_BT_HCIBFUSB_DEBUG
#undef BT_DBG
#define BT_DBG(D...)
#endif
#define VERSION "1.1"
static int ignore = 0;
static struct usb_driver bfusb_driver;
static struct usb_device_id bfusb_table[] = {
/* AVM BlueFRITZ! USB */
{ USB_DEVICE(0x057c, 0x2200) },
{ } /* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, bfusb_table);
#define BFUSB_MAX_BLOCK_SIZE 256
#define BFUSB_BLOCK_TIMEOUT 3000
#define BFUSB_TX_PROCESS 1
#define BFUSB_TX_WAKEUP 2
#define BFUSB_MAX_BULK_TX 2
#define BFUSB_MAX_BULK_RX 2
struct bfusb {
struct hci_dev *hdev;
unsigned long state;
struct usb_device *udev;
unsigned int bulk_in_ep;
unsigned int bulk_out_ep;
unsigned int bulk_pkt_size;
rwlock_t lock;
struct sk_buff_head transmit_q;
struct sk_buff *reassembly;
atomic_t pending_tx;
struct sk_buff_head pending_q;
struct sk_buff_head completed_q;
};
struct bfusb_scb {
struct urb *urb;
};
static void bfusb_tx_complete(struct urb *urb, struct pt_regs *regs);
static void bfusb_rx_complete(struct urb *urb, struct pt_regs *regs);
static struct urb *bfusb_get_completed(struct bfusb *bfusb)
{
struct sk_buff *skb;
struct urb *urb = NULL;
BT_DBG("bfusb %p", bfusb);
skb = skb_dequeue(&bfusb->completed_q);
if (skb) {
urb = ((struct bfusb_scb *) skb->cb)->urb;
kfree_skb(skb);
}
return urb;
}
static void bfusb_unlink_urbs(struct bfusb *bfusb)
{
struct sk_buff *skb;
struct urb *urb;
BT_DBG("bfusb %p", bfusb);
while ((skb = skb_dequeue(&bfusb->pending_q))) {
urb = ((struct bfusb_scb *) skb->cb)->urb;
usb_kill_urb(urb);
skb_queue_tail(&bfusb->completed_q, skb);
}
while ((urb = bfusb_get_completed(bfusb)))
usb_free_urb(urb);
}
static int bfusb_send_bulk(struct bfusb *bfusb, struct sk_buff *skb)
{
struct bfusb_scb *scb = (void *) skb->cb;
struct urb *urb = bfusb_get_completed(bfusb);
int err, pipe;
BT_DBG("bfusb %p skb %p len %d", bfusb, skb, skb->len);
if (!urb && !(urb = usb_alloc_urb(0, GFP_ATOMIC)))
return -ENOMEM;
pipe = usb_sndbulkpipe(bfusb->udev, bfusb->bulk_out_ep);
usb_fill_bulk_urb(urb, bfusb->udev, pipe, skb->data, skb->len,
bfusb_tx_complete, skb);
scb->urb = urb;
skb_queue_tail(&bfusb->pending_q, skb);
err = usb_submit_urb(urb, GFP_ATOMIC);
if (err) {
BT_ERR("%s bulk tx submit failed urb %p err %d",
bfusb->hdev->name, urb, err);
skb_unlink(skb, &bfusb->pending_q);
usb_free_urb(urb);
} else
atomic_inc(&bfusb->pending_tx);
return err;
}
static void bfusb_tx_wakeup(struct bfusb *bfusb)
{
struct sk_buff *skb;
BT_DBG("bfusb %p", bfusb);
if (test_and_set_bit(BFUSB_TX_PROCESS, &bfusb->state)) {
set_bit(BFUSB_TX_WAKEUP, &bfusb->state);
return;
}
do {
clear_bit(BFUSB_TX_WAKEUP, &bfusb->state);
while ((atomic_read(&bfusb->pending_tx) < BFUSB_MAX_BULK_TX) &&
(skb = skb_dequeue(&bfusb->transmit_q))) {
if (bfusb_send_bulk(bfusb, skb) < 0) {
skb_queue_head(&bfusb->transmit_q, skb);
break;
}
}
} while (test_bit(BFUSB_TX_WAKEUP, &bfusb->state));
clear_bit(BFUSB_TX_PROCESS, &bfusb->state);
}
static void bfusb_tx_complete(struct urb *urb, struct pt_regs *regs)
{
struct sk_buff *skb = (struct sk_buff *) urb->context;
struct bfusb *bfusb = (struct bfusb *) skb->dev;
BT_DBG("bfusb %p urb %p skb %p len %d", bfusb, urb, skb, skb->len);
atomic_dec(&bfusb->pending_tx);
if (!test_bit(HCI_RUNNING, &bfusb->hdev->flags))
return;
if (!urb->status)
bfusb->hdev->stat.byte_tx += skb->len;
else
bfusb->hdev->stat.err_tx++;
read_lock(&bfusb->lock);
skb_unlink(skb, &bfusb->pending_q);
skb_queue_tail(&bfusb->completed_q, skb);
bfusb_tx_wakeup(bfusb);
read_unlock(&bfusb->lock);
}
static int bfusb_rx_submit(struct bfusb *bfusb, struct urb *urb)
{
struct bfusb_scb *scb;
struct sk_buff *skb;
int err, pipe, size = HCI_MAX_FRAME_SIZE + 32;
BT_DBG("bfusb %p urb %p", bfusb, urb);
if (!urb && !(urb = usb_alloc_urb(0, GFP_ATOMIC)))
return -ENOMEM;
if (!(skb = bt_skb_alloc(size, GFP_ATOMIC))) {
usb_free_urb(urb);
return -ENOMEM;
}
skb->dev = (void *) bfusb;
scb = (struct bfusb_scb *) skb->cb;
scb->urb = urb;
pipe = usb_rcvbulkpipe(bfusb->udev, bfusb->bulk_in_ep);
usb_fill_bulk_urb(urb, bfusb->udev, pipe, skb->data, size,
bfusb_rx_complete, skb);
skb_queue_tail(&bfusb->pending_q, skb);
err = usb_submit_urb(urb, GFP_ATOMIC);
if (err) {
BT_ERR("%s bulk rx submit failed urb %p err %d",
bfusb->hdev->name, urb, err);
skb_unlink(skb, &bfusb->pending_q);
kfree_skb(skb);
usb_free_urb(urb);
}
return err;
}
static inline int bfusb_recv_block(struct bfusb *bfusb, int hdr, unsigned char *data, int len)
{
BT_DBG("bfusb %p hdr 0x%02x data %p len %d", bfusb, hdr, data, len);
if (hdr & 0x10) {
BT_ERR("%s error in block", bfusb->hdev->name);
if (bfusb->reassembly)
kfree_skb(bfusb->reassembly);
bfusb->reassembly = NULL;
return -EIO;
}
if (hdr & 0x04) {
struct sk_buff *skb;
unsigned char pkt_type;
int pkt_len = 0;
if (bfusb->reassembly) {
BT_ERR("%s unexpected start block", bfusb->hdev->name);
kfree_skb(bfusb->reassembly);
bfusb->reassembly = NULL;
}
if (len < 1) {
BT_ERR("%s no packet type found", bfusb->hdev->name);
return -EPROTO;
}
pkt_type = *data++; len--;
switch (pkt_type) {
case HCI_EVENT_PKT:
if (len >= HCI_EVENT_HDR_SIZE) {
struct hci_event_hdr *hdr = (struct hci_event_hdr *) data;
pkt_len = HCI_EVENT_HDR_SIZE + hdr->plen;
} else {
BT_ERR("%s event block is too short", bfusb->hdev->name);
return -EILSEQ;
}
break;
case HCI_ACLDATA_PKT:
if (len >= HCI_ACL_HDR_SIZE) {
struct hci_acl_hdr *hdr = (struct hci_acl_hdr *) data;
pkt_len = HCI_ACL_HDR_SIZE + __le16_to_cpu(hdr->dlen);
} else {
BT_ERR("%s data block is too short", bfusb->hdev->name);
return -EILSEQ;
}
break;
case HCI_SCODATA_PKT:
if (len >= HCI_SCO_HDR_SIZE) {
struct hci_sco_hdr *hdr = (struct hci_sco_hdr *) data;
pkt_len = HCI_SCO_HDR_SIZE + hdr->dlen;
} else {
BT_ERR("%s audio block is too short", bfusb->hdev->name);
return -EILSEQ;
}
break;
}
skb = bt_skb_alloc(pkt_len, GFP_ATOMIC);
if (!skb) {
BT_ERR("%s no memory for the packet", bfusb->hdev->name);
return -ENOMEM;
}
skb->dev = (void *) bfusb->hdev;
bt_cb(skb)->pkt_type = pkt_type;
bfusb->reassembly = skb;
} else {
if (!bfusb->reassembly) {
BT_ERR("%s unexpected continuation block", bfusb->hdev->name);
return -EIO;
}
}
if (len > 0)
memcpy(skb_put(bfusb->reassembly, len), data, len);
if (hdr & 0x08) {
hci_recv_frame(bfusb->reassembly);
bfusb->reassembly = NULL;
}
return 0;
}
static void bfusb_rx_complete(struct urb *urb, struct pt_regs *regs)
{
struct sk_buff *skb = (struct sk_buff *) urb->context;
struct bfusb *bfusb = (struct bfusb *) skb->dev;
unsigned char *buf = urb->transfer_buffer;
int count = urb->actual_length;
int err, hdr, len;
BT_DBG("bfusb %p urb %p skb %p len %d", bfusb, urb, skb, skb->len);
read_lock(&bfusb->lock);
if (!test_bit(HCI_RUNNING, &bfusb->hdev->flags))
goto unlock;
if (urb->status || !count)
goto resubmit;
bfusb->hdev->stat.byte_rx += count;
skb_put(skb, count);
while (count) {
hdr = buf[0] | (buf[1] << 8);
if (hdr & 0x4000) {
len = 0;
count -= 2;
buf += 2;
} else {
len = (buf[2] == 0) ? 256 : buf[2];
count -= 3;
buf += 3;
}
if (count < len) {
BT_ERR("%s block extends over URB buffer ranges",
bfusb->hdev->name);
}
if ((hdr & 0xe1) == 0xc1)
bfusb_recv_block(bfusb, hdr, buf, len);
count -= len;
buf += len;
}
skb_unlink(skb, &bfusb->pending_q);
kfree_skb(skb);
bfusb_rx_submit(bfusb, urb);
read_unlock(&bfusb->lock);
return;
resubmit:
urb->dev = bfusb->udev;
err = usb_submit_urb(urb, GFP_ATOMIC);
if (err) {
BT_ERR("%s bulk resubmit failed urb %p err %d",
bfusb->hdev->name, urb, err);
}
unlock:
read_unlock(&bfusb->lock);
}
static int bfusb_open(struct hci_dev *hdev)
{
struct bfusb *bfusb = (struct bfusb *) hdev->driver_data;
unsigned long flags;
int i, err;
BT_DBG("hdev %p bfusb %p", hdev, bfusb);
if (test_and_set_bit(HCI_RUNNING, &hdev->flags))
return 0;
write_lock_irqsave(&bfusb->lock, flags);
err = bfusb_rx_submit(bfusb, NULL);
if (!err) {
for (i = 1; i < BFUSB_MAX_BULK_RX; i++)
bfusb_rx_submit(bfusb, NULL);
} else {
clear_bit(HCI_RUNNING, &hdev->flags);
}
write_unlock_irqrestore(&bfusb->lock, flags);
return err;
}
static int bfusb_flush(struct hci_dev *hdev)
{
struct bfusb *bfusb = (struct bfusb *) hdev->driver_data;
BT_DBG("hdev %p bfusb %p", hdev, bfusb);
skb_queue_purge(&bfusb->transmit_q);
return 0;
}
static int bfusb_close(struct hci_dev *hdev)
{
struct bfusb *bfusb = (struct bfusb *) hdev->driver_data;
unsigned long flags;
BT_DBG("hdev %p bfusb %p", hdev, bfusb);
if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
return 0;
write_lock_irqsave(&bfusb->lock, flags);
write_unlock_irqrestore(&bfusb->lock, flags);
bfusb_unlink_urbs(bfusb);
bfusb_flush(hdev);
return 0;
}
static int bfusb_send_frame(struct sk_buff *skb)
{
struct hci_dev *hdev = (struct hci_dev *) skb->dev;
struct bfusb *bfusb;
struct sk_buff *nskb;
unsigned char buf[3];
int sent = 0, size, count;
BT_DBG("hdev %p skb %p type %d len %d", hdev, skb, bt_cb(skb)->pkt_type, skb->len);
if (!hdev) {
BT_ERR("Frame for unknown HCI device (hdev=NULL)");
return -ENODEV;
}
if (!test_bit(HCI_RUNNING, &hdev->flags))
return -EBUSY;
bfusb = (struct bfusb *) hdev->driver_data;
switch (bt_cb(skb)->pkt_type) {
case HCI_COMMAND_PKT:
hdev->stat.cmd_tx++;
break;
case HCI_ACLDATA_PKT:
hdev->stat.acl_tx++;
break;
case HCI_SCODATA_PKT:
hdev->stat.sco_tx++;
break;
};
/* Prepend skb with frame type */
memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
count = skb->len;
/* Max HCI frame size seems to be 1511 + 1 */
if (!(nskb = bt_skb_alloc(count + 32, GFP_ATOMIC))) {
BT_ERR("Can't allocate memory for new packet");
return -ENOMEM;
}
nskb->dev = (void *) bfusb;
while (count) {
size = min_t(uint, count, BFUSB_MAX_BLOCK_SIZE);
buf[0] = 0xc1 | ((sent == 0) ? 0x04 : 0) | ((count == size) ? 0x08 : 0);
buf[1] = 0x00;
buf[2] = (size == BFUSB_MAX_BLOCK_SIZE) ? 0 : size;
memcpy(skb_put(nskb, 3), buf, 3);
memcpy(skb_put(nskb, size), skb->data + sent, size);
sent += size;
count -= size;
}
/* Don't send frame with multiple size of bulk max packet */
if ((nskb->len % bfusb->bulk_pkt_size) == 0) {
buf[0] = 0xdd;
buf[1] = 0x00;
memcpy(skb_put(nskb, 2), buf, 2);
}
read_lock(&bfusb->lock);
skb_queue_tail(&bfusb->transmit_q, nskb);
bfusb_tx_wakeup(bfusb);
read_unlock(&bfusb->lock);
kfree_skb(skb);
return 0;
}
static void bfusb_destruct(struct hci_dev *hdev)
{
struct bfusb *bfusb = (struct bfusb *) hdev->driver_data;
BT_DBG("hdev %p bfusb %p", hdev, bfusb);
kfree(bfusb);
}
static int bfusb_ioctl(struct hci_dev *hdev, unsigned int cmd, unsigned long arg)
{
return -ENOIOCTLCMD;
}
static int bfusb_load_firmware(struct bfusb *bfusb, unsigned char *firmware, int count)
{
unsigned char *buf;
int err, pipe, len, size, sent = 0;
BT_DBG("bfusb %p udev %p", bfusb, bfusb->udev);
BT_INFO("BlueFRITZ! USB loading firmware");
pipe = usb_sndctrlpipe(bfusb->udev, 0);
if (usb_control_msg(bfusb->udev, pipe, USB_REQ_SET_CONFIGURATION,
0, 1, 0, NULL, 0, USB_CTRL_SET_TIMEOUT) < 0) {
BT_ERR("Can't change to loading configuration");
return -EBUSY;
}
bfusb->udev->toggle[0] = bfusb->udev->toggle[1] = 0;
buf = kmalloc(BFUSB_MAX_BLOCK_SIZE + 3, GFP_ATOMIC);
if (!buf) {
BT_ERR("Can't allocate memory chunk for firmware");
return -ENOMEM;
}
pipe = usb_sndbulkpipe(bfusb->udev, bfusb->bulk_out_ep);
while (count) {
size = min_t(uint, count, BFUSB_MAX_BLOCK_SIZE + 3);
memcpy(buf, firmware + sent, size);
err = usb_bulk_msg(bfusb->udev, pipe, buf, size,
&len, BFUSB_BLOCK_TIMEOUT);
if (err || (len != size)) {
BT_ERR("Error in firmware loading");
goto error;
}
sent += size;
count -= size;
}
if ((err = usb_bulk_msg(bfusb->udev, pipe, NULL, 0,
&len, BFUSB_BLOCK_TIMEOUT)) < 0) {
BT_ERR("Error in null packet request");
goto error;
}
pipe = usb_sndctrlpipe(bfusb->udev, 0);
if ((err = usb_control_msg(bfusb->udev, pipe, USB_REQ_SET_CONFIGURATION,
0, 2, 0, NULL, 0, USB_CTRL_SET_TIMEOUT)) < 0) {
BT_ERR("Can't change to running configuration");
goto error;
}
bfusb->udev->toggle[0] = bfusb->udev->toggle[1] = 0;
BT_INFO("BlueFRITZ! USB device ready");
kfree(buf);
return 0;
error:
kfree(buf);
pipe = usb_sndctrlpipe(bfusb->udev, 0);
usb_control_msg(bfusb->udev, pipe, USB_REQ_SET_CONFIGURATION,
0, 0, 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
return err;
}
static int bfusb_probe(struct usb_interface *intf, const struct usb_device_id *id)
{
const struct firmware *firmware;
struct usb_device *udev = interface_to_usbdev(intf);
struct usb_host_endpoint *bulk_out_ep;
struct usb_host_endpoint *bulk_in_ep;
struct hci_dev *hdev;
struct bfusb *bfusb;
BT_DBG("intf %p id %p", intf, id);
if (ignore)
return -ENODEV;
/* Check number of endpoints */
if (intf->cur_altsetting->desc.bNumEndpoints < 2)
return -EIO;
bulk_out_ep = &intf->cur_altsetting->endpoint[0];
bulk_in_ep = &intf->cur_altsetting->endpoint[1];
if (!bulk_out_ep || !bulk_in_ep) {
BT_ERR("Bulk endpoints not found");
goto done;
}
/* Initialize control structure and load firmware */
if (!(bfusb = kmalloc(sizeof(struct bfusb), GFP_KERNEL))) {
BT_ERR("Can't allocate memory for control structure");
goto done;
}
memset(bfusb, 0, sizeof(struct bfusb));
bfusb->udev = udev;
bfusb->bulk_in_ep = bulk_in_ep->desc.bEndpointAddress;
bfusb->bulk_out_ep = bulk_out_ep->desc.bEndpointAddress;
bfusb->bulk_pkt_size = le16_to_cpu(bulk_out_ep->desc.wMaxPacketSize);
rwlock_init(&bfusb->lock);
bfusb->reassembly = NULL;
skb_queue_head_init(&bfusb->transmit_q);
skb_queue_head_init(&bfusb->pending_q);
skb_queue_head_init(&bfusb->completed_q);
if (request_firmware(&firmware, "bfubase.frm", &udev->dev) < 0) {
BT_ERR("Firmware request failed");
goto error;
}
BT_DBG("firmware data %p size %d", firmware->data, firmware->size);
if (bfusb_load_firmware(bfusb, firmware->data, firmware->size) < 0) {
BT_ERR("Firmware loading failed");
goto release;
}
release_firmware(firmware);
/* Initialize and register HCI device */
hdev = hci_alloc_dev();
if (!hdev) {
BT_ERR("Can't allocate HCI device");
goto error;
}
bfusb->hdev = hdev;
hdev->type = HCI_USB;
hdev->driver_data = bfusb;
SET_HCIDEV_DEV(hdev, &intf->dev);
hdev->open = bfusb_open;
hdev->close = bfusb_close;
hdev->flush = bfusb_flush;
hdev->send = bfusb_send_frame;
hdev->destruct = bfusb_destruct;
hdev->ioctl = bfusb_ioctl;
hdev->owner = THIS_MODULE;
if (hci_register_dev(hdev) < 0) {
BT_ERR("Can't register HCI device");
hci_free_dev(hdev);
goto error;
}
usb_set_intfdata(intf, bfusb);
return 0;
release:
release_firmware(firmware);
error:
kfree(bfusb);
done:
return -EIO;
}
static void bfusb_disconnect(struct usb_interface *intf)
{
struct bfusb *bfusb = usb_get_intfdata(intf);
struct hci_dev *hdev = bfusb->hdev;
BT_DBG("intf %p", intf);
if (!hdev)
return;
usb_set_intfdata(intf, NULL);
bfusb_close(hdev);
if (hci_unregister_dev(hdev) < 0)
BT_ERR("Can't unregister HCI device %s", hdev->name);
hci_free_dev(hdev);
}
static struct usb_driver bfusb_driver = {
.owner = THIS_MODULE,
.name = "bfusb",
.probe = bfusb_probe,
.disconnect = bfusb_disconnect,
.id_table = bfusb_table,
};
static int __init bfusb_init(void)
{
int err;
BT_INFO("BlueFRITZ! USB driver ver %s", VERSION);
if ((err = usb_register(&bfusb_driver)) < 0)
BT_ERR("Failed to register BlueFRITZ! USB driver");
return err;
}
static void __exit bfusb_exit(void)
{
usb_deregister(&bfusb_driver);
}
module_init(bfusb_init);
module_exit(bfusb_exit);
module_param(ignore, bool, 0644);
MODULE_PARM_DESC(ignore, "Ignore devices from the matching table");
MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
MODULE_DESCRIPTION("BlueFRITZ! USB driver ver " VERSION);
MODULE_VERSION(VERSION);
MODULE_LICENSE("GPL");