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linux/drivers/bluetooth/bfusb.c

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/*
*
* AVM BlueFRITZ! USB driver
*
* Copyright (C) 2003-2006 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/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/types.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>
#define VERSION "1.2"
static struct usb_driver bfusb_driver;
static const 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_data {
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_data_scb {
struct urb *urb;
};
static void bfusb_tx_complete(struct urb *urb);
static void bfusb_rx_complete(struct urb *urb);
static struct urb *bfusb_get_completed(struct bfusb_data *data)
{
struct sk_buff *skb;
struct urb *urb = NULL;
BT_DBG("bfusb %p", data);
skb = skb_dequeue(&data->completed_q);
if (skb) {
urb = ((struct bfusb_data_scb *) skb->cb)->urb;
kfree_skb(skb);
}
return urb;
}
static void bfusb_unlink_urbs(struct bfusb_data *data)
{
struct sk_buff *skb;
struct urb *urb;
BT_DBG("bfusb %p", data);
while ((skb = skb_dequeue(&data->pending_q))) {
urb = ((struct bfusb_data_scb *) skb->cb)->urb;
usb_kill_urb(urb);
skb_queue_tail(&data->completed_q, skb);
}
while ((urb = bfusb_get_completed(data)))
usb_free_urb(urb);
}
static int bfusb_send_bulk(struct bfusb_data *data, struct sk_buff *skb)
{
struct bfusb_data_scb *scb = (void *) skb->cb;
struct urb *urb = bfusb_get_completed(data);
int err, pipe;
BT_DBG("bfusb %p skb %p len %d", data, skb, skb->len);
if (!urb) {
urb = usb_alloc_urb(0, GFP_ATOMIC);
if (!urb)
return -ENOMEM;
}
pipe = usb_sndbulkpipe(data->udev, data->bulk_out_ep);
usb_fill_bulk_urb(urb, data->udev, pipe, skb->data, skb->len,
bfusb_tx_complete, skb);
scb->urb = urb;
skb_queue_tail(&data->pending_q, skb);
err = usb_submit_urb(urb, GFP_ATOMIC);
if (err) {
BT_ERR("%s bulk tx submit failed urb %p err %d",
data->hdev->name, urb, err);
skb_unlink(skb, &data->pending_q);
usb_free_urb(urb);
} else
atomic_inc(&data->pending_tx);
return err;
}
static void bfusb_tx_wakeup(struct bfusb_data *data)
{
struct sk_buff *skb;
BT_DBG("bfusb %p", data);
if (test_and_set_bit(BFUSB_TX_PROCESS, &data->state)) {
set_bit(BFUSB_TX_WAKEUP, &data->state);
return;
}
do {
clear_bit(BFUSB_TX_WAKEUP, &data->state);
while ((atomic_read(&data->pending_tx) < BFUSB_MAX_BULK_TX) &&
(skb = skb_dequeue(&data->transmit_q))) {
if (bfusb_send_bulk(data, skb) < 0) {
skb_queue_head(&data->transmit_q, skb);
break;
}
}
} while (test_bit(BFUSB_TX_WAKEUP, &data->state));
clear_bit(BFUSB_TX_PROCESS, &data->state);
}
static void bfusb_tx_complete(struct urb *urb)
{
struct sk_buff *skb = (struct sk_buff *) urb->context;
struct bfusb_data *data = (struct bfusb_data *) skb->dev;
BT_DBG("bfusb %p urb %p skb %p len %d", data, urb, skb, skb->len);
atomic_dec(&data->pending_tx);
if (!test_bit(HCI_RUNNING, &data->hdev->flags))
return;
if (!urb->status)
data->hdev->stat.byte_tx += skb->len;
else
data->hdev->stat.err_tx++;
read_lock(&data->lock);
skb_unlink(skb, &data->pending_q);
skb_queue_tail(&data->completed_q, skb);
bfusb_tx_wakeup(data);
read_unlock(&data->lock);
}
static int bfusb_rx_submit(struct bfusb_data *data, struct urb *urb)
{
struct bfusb_data_scb *scb;
struct sk_buff *skb;
int err, pipe, size = HCI_MAX_FRAME_SIZE + 32;
BT_DBG("bfusb %p urb %p", data, urb);
if (!urb) {
urb = usb_alloc_urb(0, GFP_ATOMIC);
if (!urb)
return -ENOMEM;
}
skb = bt_skb_alloc(size, GFP_ATOMIC);
if (!skb) {
usb_free_urb(urb);
return -ENOMEM;
}
skb->dev = (void *) data;
scb = (struct bfusb_data_scb *) skb->cb;
scb->urb = urb;
pipe = usb_rcvbulkpipe(data->udev, data->bulk_in_ep);
usb_fill_bulk_urb(urb, data->udev, pipe, skb->data, size,
bfusb_rx_complete, skb);
skb_queue_tail(&data->pending_q, skb);
err = usb_submit_urb(urb, GFP_ATOMIC);
if (err) {
BT_ERR("%s bulk rx submit failed urb %p err %d",
data->hdev->name, urb, err);
skb_unlink(skb, &data->pending_q);
kfree_skb(skb);
usb_free_urb(urb);
}
return err;
}
static inline int bfusb_recv_block(struct bfusb_data *data, int hdr, unsigned char *buf, int len)
{
BT_DBG("bfusb %p hdr 0x%02x data %p len %d", data, hdr, buf, len);
if (hdr & 0x10) {
BT_ERR("%s error in block", data->hdev->name);
kfree_skb(data->reassembly);
data->reassembly = NULL;
return -EIO;
}
if (hdr & 0x04) {
struct sk_buff *skb;
unsigned char pkt_type;
int pkt_len = 0;
if (data->reassembly) {
BT_ERR("%s unexpected start block", data->hdev->name);
kfree_skb(data->reassembly);
data->reassembly = NULL;
}
if (len < 1) {
BT_ERR("%s no packet type found", data->hdev->name);
return -EPROTO;
}
pkt_type = *buf++; len--;
switch (pkt_type) {
case HCI_EVENT_PKT:
if (len >= HCI_EVENT_HDR_SIZE) {
struct hci_event_hdr *hdr = (struct hci_event_hdr *) buf;
pkt_len = HCI_EVENT_HDR_SIZE + hdr->plen;
} else {
BT_ERR("%s event block is too short", data->hdev->name);
return -EILSEQ;
}
break;
case HCI_ACLDATA_PKT:
if (len >= HCI_ACL_HDR_SIZE) {
struct hci_acl_hdr *hdr = (struct hci_acl_hdr *) buf;
pkt_len = HCI_ACL_HDR_SIZE + __le16_to_cpu(hdr->dlen);
} else {
BT_ERR("%s data block is too short", data->hdev->name);
return -EILSEQ;
}
break;
case HCI_SCODATA_PKT:
if (len >= HCI_SCO_HDR_SIZE) {
struct hci_sco_hdr *hdr = (struct hci_sco_hdr *) buf;
pkt_len = HCI_SCO_HDR_SIZE + hdr->dlen;
} else {
BT_ERR("%s audio block is too short", data->hdev->name);
return -EILSEQ;
}
break;
}
skb = bt_skb_alloc(pkt_len, GFP_ATOMIC);
if (!skb) {
BT_ERR("%s no memory for the packet", data->hdev->name);
return -ENOMEM;
}
bt_cb(skb)->pkt_type = pkt_type;
data->reassembly = skb;
} else {
if (!data->reassembly) {
BT_ERR("%s unexpected continuation block", data->hdev->name);
return -EIO;
}
}
if (len > 0)
memcpy(skb_put(data->reassembly, len), buf, len);
if (hdr & 0x08) {
hci_recv_frame(data->hdev, data->reassembly);
data->reassembly = NULL;
}
return 0;
}
static void bfusb_rx_complete(struct urb *urb)
{
struct sk_buff *skb = (struct sk_buff *) urb->context;
struct bfusb_data *data = (struct bfusb_data *) 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", data, urb, skb, skb->len);
read_lock(&data->lock);
if (!test_bit(HCI_RUNNING, &data->hdev->flags))
goto unlock;
if (urb->status || !count)
goto resubmit;
data->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",
data->hdev->name);
}
if ((hdr & 0xe1) == 0xc1)
bfusb_recv_block(data, hdr, buf, len);
count -= len;
buf += len;
}
skb_unlink(skb, &data->pending_q);
kfree_skb(skb);
bfusb_rx_submit(data, urb);
read_unlock(&data->lock);
return;
resubmit:
urb->dev = data->udev;
err = usb_submit_urb(urb, GFP_ATOMIC);
if (err) {
BT_ERR("%s bulk resubmit failed urb %p err %d",
data->hdev->name, urb, err);
}
unlock:
read_unlock(&data->lock);
}
static int bfusb_open(struct hci_dev *hdev)
{
struct bfusb_data *data = hci_get_drvdata(hdev);
unsigned long flags;
int i, err;
BT_DBG("hdev %p bfusb %p", hdev, data);
if (test_and_set_bit(HCI_RUNNING, &hdev->flags))
return 0;
write_lock_irqsave(&data->lock, flags);
err = bfusb_rx_submit(data, NULL);
if (!err) {
for (i = 1; i < BFUSB_MAX_BULK_RX; i++)
bfusb_rx_submit(data, NULL);
} else {
clear_bit(HCI_RUNNING, &hdev->flags);
}
write_unlock_irqrestore(&data->lock, flags);
return err;
}
static int bfusb_flush(struct hci_dev *hdev)
{
struct bfusb_data *data = hci_get_drvdata(hdev);
BT_DBG("hdev %p bfusb %p", hdev, data);
skb_queue_purge(&data->transmit_q);
return 0;
}
static int bfusb_close(struct hci_dev *hdev)
{
struct bfusb_data *data = hci_get_drvdata(hdev);
unsigned long flags;
BT_DBG("hdev %p bfusb %p", hdev, data);
if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
return 0;
write_lock_irqsave(&data->lock, flags);
write_unlock_irqrestore(&data->lock, flags);
bfusb_unlink_urbs(data);
bfusb_flush(hdev);
return 0;
}
static int bfusb_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
{
struct bfusb_data *data = hci_get_drvdata(hdev);
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 (!test_bit(HCI_RUNNING, &hdev->flags))
return -EBUSY;
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 */
nskb = bt_skb_alloc(count + 32, GFP_ATOMIC);
if (!nskb) {
BT_ERR("Can't allocate memory for new packet");
return -ENOMEM;
}
nskb->dev = (void *) data;
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);
skb_copy_from_linear_data_offset(skb, sent, skb_put(nskb, size), size);
sent += size;
count -= size;
}
/* Don't send frame with multiple size of bulk max packet */
if ((nskb->len % data->bulk_pkt_size) == 0) {
buf[0] = 0xdd;
buf[1] = 0x00;
memcpy(skb_put(nskb, 2), buf, 2);
}
read_lock(&data->lock);
skb_queue_tail(&data->transmit_q, nskb);
bfusb_tx_wakeup(data);
read_unlock(&data->lock);
kfree_skb(skb);
return 0;
}
static int bfusb_load_firmware(struct bfusb_data *data,
const unsigned char *firmware, int count)
{
unsigned char *buf;
int err, pipe, len, size, sent = 0;
BT_DBG("bfusb %p udev %p", data, data->udev);
BT_INFO("BlueFRITZ! USB loading firmware");
buf = kmalloc(BFUSB_MAX_BLOCK_SIZE + 3, GFP_KERNEL);
if (!buf) {
BT_ERR("Can't allocate memory chunk for firmware");
return -ENOMEM;
}
pipe = usb_sndctrlpipe(data->udev, 0);
if (usb_control_msg(data->udev, pipe, USB_REQ_SET_CONFIGURATION,
0, 1, 0, NULL, 0, USB_CTRL_SET_TIMEOUT) < 0) {
BT_ERR("Can't change to loading configuration");
kfree(buf);
return -EBUSY;
}
data->udev->toggle[0] = data->udev->toggle[1] = 0;
pipe = usb_sndbulkpipe(data->udev, data->bulk_out_ep);
while (count) {
size = min_t(uint, count, BFUSB_MAX_BLOCK_SIZE + 3);
memcpy(buf, firmware + sent, size);
err = usb_bulk_msg(data->udev, pipe, buf, size,
&len, BFUSB_BLOCK_TIMEOUT);
if (err || (len != size)) {
BT_ERR("Error in firmware loading");
goto error;
}
sent += size;
count -= size;
}
err = usb_bulk_msg(data->udev, pipe, NULL, 0,
&len, BFUSB_BLOCK_TIMEOUT);
if (err < 0) {
BT_ERR("Error in null packet request");
goto error;
}
pipe = usb_sndctrlpipe(data->udev, 0);
err = usb_control_msg(data->udev, pipe, USB_REQ_SET_CONFIGURATION,
0, 2, 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
if (err < 0) {
BT_ERR("Can't change to running configuration");
goto error;
}
data->udev->toggle[0] = data->udev->toggle[1] = 0;
BT_INFO("BlueFRITZ! USB device ready");
kfree(buf);
return 0;
error:
kfree(buf);
pipe = usb_sndctrlpipe(data->udev, 0);
usb_control_msg(data->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_data *data;
BT_DBG("intf %p id %p", intf, id);
/* 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 */
data = devm_kzalloc(&intf->dev, sizeof(struct bfusb_data), GFP_KERNEL);
if (!data) {
BT_ERR("Can't allocate memory for control structure");
goto done;
}
data->udev = udev;
data->bulk_in_ep = bulk_in_ep->desc.bEndpointAddress;
data->bulk_out_ep = bulk_out_ep->desc.bEndpointAddress;
data->bulk_pkt_size = le16_to_cpu(bulk_out_ep->desc.wMaxPacketSize);
rwlock_init(&data->lock);
data->reassembly = NULL;
skb_queue_head_init(&data->transmit_q);
skb_queue_head_init(&data->pending_q);
skb_queue_head_init(&data->completed_q);
if (request_firmware(&firmware, "bfubase.frm", &udev->dev) < 0) {
BT_ERR("Firmware request failed");
goto done;
}
BT_DBG("firmware data %p size %zu", firmware->data, firmware->size);
if (bfusb_load_firmware(data, 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 done;
}
data->hdev = hdev;
hdev->bus = HCI_USB;
hci_set_drvdata(hdev, data);
SET_HCIDEV_DEV(hdev, &intf->dev);
hdev->open = bfusb_open;
hdev->close = bfusb_close;
hdev->flush = bfusb_flush;
hdev->send = bfusb_send_frame;
if (hci_register_dev(hdev) < 0) {
BT_ERR("Can't register HCI device");
hci_free_dev(hdev);
goto done;
}
usb_set_intfdata(intf, data);
return 0;
release:
release_firmware(firmware);
done:
return -EIO;
}
static void bfusb_disconnect(struct usb_interface *intf)
{
struct bfusb_data *data = usb_get_intfdata(intf);
struct hci_dev *hdev = data->hdev;
BT_DBG("intf %p", intf);
if (!hdev)
return;
usb_set_intfdata(intf, NULL);
bfusb_close(hdev);
hci_unregister_dev(hdev);
hci_free_dev(hdev);
}
static struct usb_driver bfusb_driver = {
.name = "bfusb",
.probe = bfusb_probe,
.disconnect = bfusb_disconnect,
.id_table = bfusb_table,
.disable_hub_initiated_lpm = 1,
};
module_usb_driver(bfusb_driver);
MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
MODULE_DESCRIPTION("BlueFRITZ! USB driver ver " VERSION);
MODULE_VERSION(VERSION);
MODULE_LICENSE("GPL");
MODULE_FIRMWARE("bfubase.frm");
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