linux-sg2042/drivers/bluetooth/btusb.c

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/*
*
* Generic Bluetooth USB driver
*
* Copyright (C) 2005-2007 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/kernel.h>
#include <linux/module.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/usb.h>
#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
//#define CONFIG_BT_HCIBTUSB_DEBUG
#ifndef CONFIG_BT_HCIBTUSB_DEBUG
#undef BT_DBG
#define BT_DBG(D...)
#endif
#define VERSION "0.1"
static struct usb_device_id btusb_table[] = {
/* Generic Bluetooth USB device */
{ USB_DEVICE_INFO(0xe0, 0x01, 0x01) },
{ } /* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, btusb_table);
static struct usb_device_id blacklist_table[] = {
{ } /* Terminating entry */
};
#define BTUSB_INTR_RUNNING 0
#define BTUSB_BULK_RUNNING 1
struct btusb_data {
struct hci_dev *hdev;
struct usb_device *udev;
spinlock_t lock;
unsigned long flags;
struct work_struct work;
struct usb_anchor tx_anchor;
struct usb_anchor intr_anchor;
struct usb_anchor bulk_anchor;
struct usb_endpoint_descriptor *intr_ep;
struct usb_endpoint_descriptor *bulk_tx_ep;
struct usb_endpoint_descriptor *bulk_rx_ep;
};
static void btusb_intr_complete(struct urb *urb)
{
struct hci_dev *hdev = urb->context;
struct btusb_data *data = hdev->driver_data;
int err;
BT_DBG("%s urb %p status %d count %d", hdev->name,
urb, urb->status, urb->actual_length);
if (!test_bit(HCI_RUNNING, &hdev->flags))
return;
if (urb->status == 0) {
if (hci_recv_fragment(hdev, HCI_EVENT_PKT,
urb->transfer_buffer,
urb->actual_length) < 0) {
BT_ERR("%s corrupted event packet", hdev->name);
hdev->stat.err_rx++;
}
}
if (!test_bit(BTUSB_INTR_RUNNING, &data->flags))
return;
usb_anchor_urb(urb, &data->intr_anchor);
err = usb_submit_urb(urb, GFP_ATOMIC);
if (err < 0) {
BT_ERR("%s urb %p failed to resubmit (%d)",
hdev->name, urb, -err);
usb_unanchor_urb(urb);
}
}
static inline int btusb_submit_intr_urb(struct hci_dev *hdev)
{
struct btusb_data *data = hdev->driver_data;
struct urb *urb;
unsigned char *buf;
unsigned int pipe;
int err, size;
BT_DBG("%s", hdev->name);
urb = usb_alloc_urb(0, GFP_ATOMIC);
if (!urb)
return -ENOMEM;
size = le16_to_cpu(data->intr_ep->wMaxPacketSize);
buf = kmalloc(size, GFP_ATOMIC);
if (!buf) {
usb_free_urb(urb);
return -ENOMEM;
}
pipe = usb_rcvintpipe(data->udev, data->intr_ep->bEndpointAddress);
usb_fill_int_urb(urb, data->udev, pipe, buf, size,
btusb_intr_complete, hdev,
data->intr_ep->bInterval);
urb->transfer_flags |= URB_FREE_BUFFER;
usb_anchor_urb(urb, &data->intr_anchor);
err = usb_submit_urb(urb, GFP_ATOMIC);
if (err < 0) {
BT_ERR("%s urb %p submission failed (%d)",
hdev->name, urb, -err);
usb_unanchor_urb(urb);
kfree(buf);
}
usb_free_urb(urb);
return err;
}
static void btusb_bulk_complete(struct urb *urb)
{
struct hci_dev *hdev = urb->context;
struct btusb_data *data = hdev->driver_data;
int err;
BT_DBG("%s urb %p status %d count %d", hdev->name,
urb, urb->status, urb->actual_length);
if (!test_bit(HCI_RUNNING, &hdev->flags))
return;
if (urb->status == 0) {
if (hci_recv_fragment(hdev, HCI_ACLDATA_PKT,
urb->transfer_buffer,
urb->actual_length) < 0) {
BT_ERR("%s corrupted ACL packet", hdev->name);
hdev->stat.err_rx++;
}
}
if (!test_bit(BTUSB_BULK_RUNNING, &data->flags))
return;
usb_anchor_urb(urb, &data->bulk_anchor);
err = usb_submit_urb(urb, GFP_ATOMIC);
if (err < 0) {
BT_ERR("%s urb %p failed to resubmit (%d)",
hdev->name, urb, -err);
usb_unanchor_urb(urb);
}
}
static inline int btusb_submit_bulk_urb(struct hci_dev *hdev)
{
struct btusb_data *data = hdev->driver_data;
struct urb *urb;
unsigned char *buf;
unsigned int pipe;
int err, size;
BT_DBG("%s", hdev->name);
urb = usb_alloc_urb(0, GFP_KERNEL);
if (!urb)
return -ENOMEM;
size = le16_to_cpu(data->bulk_rx_ep->wMaxPacketSize);
buf = kmalloc(size, GFP_KERNEL);
if (!buf) {
usb_free_urb(urb);
return -ENOMEM;
}
pipe = usb_rcvbulkpipe(data->udev, data->bulk_rx_ep->bEndpointAddress);
usb_fill_bulk_urb(urb, data->udev, pipe,
buf, size, btusb_bulk_complete, hdev);
urb->transfer_flags |= URB_FREE_BUFFER;
usb_anchor_urb(urb, &data->bulk_anchor);
err = usb_submit_urb(urb, GFP_KERNEL);
if (err < 0) {
BT_ERR("%s urb %p submission failed (%d)",
hdev->name, urb, -err);
usb_unanchor_urb(urb);
kfree(buf);
}
usb_free_urb(urb);
return err;
}
static void btusb_tx_complete(struct urb *urb)
{
struct sk_buff *skb = urb->context;
struct hci_dev *hdev = (struct hci_dev *) skb->dev;
BT_DBG("%s urb %p status %d count %d", hdev->name,
urb, urb->status, urb->actual_length);
if (!test_bit(HCI_RUNNING, &hdev->flags))
goto done;
if (!urb->status)
hdev->stat.byte_tx += urb->transfer_buffer_length;
else
hdev->stat.err_tx++;
done:
kfree(urb->setup_packet);
kfree_skb(skb);
}
static int btusb_open(struct hci_dev *hdev)
{
struct btusb_data *data = hdev->driver_data;
int err;
BT_DBG("%s", hdev->name);
if (test_and_set_bit(HCI_RUNNING, &hdev->flags))
return 0;
if (test_and_set_bit(BTUSB_INTR_RUNNING, &data->flags))
return 0;
err = btusb_submit_intr_urb(hdev);
if (err < 0) {
clear_bit(BTUSB_INTR_RUNNING, &hdev->flags);
clear_bit(HCI_RUNNING, &hdev->flags);
}
return err;
}
static int btusb_close(struct hci_dev *hdev)
{
struct btusb_data *data = hdev->driver_data;
BT_DBG("%s", hdev->name);
if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
return 0;
clear_bit(BTUSB_BULK_RUNNING, &data->flags);
usb_kill_anchored_urbs(&data->bulk_anchor);
clear_bit(BTUSB_INTR_RUNNING, &data->flags);
usb_kill_anchored_urbs(&data->intr_anchor);
return 0;
}
static int btusb_flush(struct hci_dev *hdev)
{
struct btusb_data *data = hdev->driver_data;
BT_DBG("%s", hdev->name);
usb_kill_anchored_urbs(&data->tx_anchor);
return 0;
}
static int btusb_send_frame(struct sk_buff *skb)
{
struct hci_dev *hdev = (struct hci_dev *) skb->dev;
struct btusb_data *data = hdev->driver_data;
struct usb_ctrlrequest *dr;
struct urb *urb;
unsigned int pipe;
int err;
BT_DBG("%s", hdev->name);
if (!test_bit(HCI_RUNNING, &hdev->flags))
return -EBUSY;
switch (bt_cb(skb)->pkt_type) {
case HCI_COMMAND_PKT:
urb = usb_alloc_urb(0, GFP_ATOMIC);
if (!urb)
return -ENOMEM;
dr = kmalloc(sizeof(*dr), GFP_ATOMIC);
if (!dr) {
usb_free_urb(urb);
return -ENOMEM;
}
dr->bRequestType = USB_TYPE_CLASS;
dr->bRequest = 0;
dr->wIndex = 0;
dr->wValue = 0;
dr->wLength = __cpu_to_le16(skb->len);
pipe = usb_sndctrlpipe(data->udev, 0x00);
usb_fill_control_urb(urb, data->udev, pipe, (void *) dr,
skb->data, skb->len, btusb_tx_complete, skb);
hdev->stat.cmd_tx++;
break;
case HCI_ACLDATA_PKT:
urb = usb_alloc_urb(0, GFP_ATOMIC);
if (!urb)
return -ENOMEM;
pipe = usb_sndbulkpipe(data->udev,
data->bulk_tx_ep->bEndpointAddress);
usb_fill_bulk_urb(urb, data->udev, pipe,
skb->data, skb->len, btusb_tx_complete, skb);
hdev->stat.acl_tx++;
break;
case HCI_SCODATA_PKT:
hdev->stat.sco_tx++;
kfree_skb(skb);
return 0;
default:
return -EILSEQ;
}
usb_anchor_urb(urb, &data->tx_anchor);
err = usb_submit_urb(urb, GFP_ATOMIC);
if (err < 0) {
BT_ERR("%s urb %p submission failed", hdev->name, urb);
kfree(urb->setup_packet);
usb_unanchor_urb(urb);
}
usb_free_urb(urb);
return err;
}
static void btusb_destruct(struct hci_dev *hdev)
{
struct btusb_data *data = hdev->driver_data;
BT_DBG("%s", hdev->name);
kfree(data);
}
static void btusb_notify(struct hci_dev *hdev, unsigned int evt)
{
struct btusb_data *data = hdev->driver_data;
BT_DBG("%s evt %d", hdev->name, evt);
if (evt == HCI_NOTIFY_CONN_ADD || evt == HCI_NOTIFY_CONN_DEL)
schedule_work(&data->work);
}
static void btusb_work(struct work_struct *work)
{
struct btusb_data *data = container_of(work, struct btusb_data, work);
struct hci_dev *hdev = data->hdev;
if (hdev->conn_hash.acl_num == 0) {
clear_bit(BTUSB_BULK_RUNNING, &data->flags);
usb_kill_anchored_urbs(&data->bulk_anchor);
return;
}
if (!test_and_set_bit(BTUSB_BULK_RUNNING, &data->flags)) {
if (btusb_submit_bulk_urb(hdev) < 0)
clear_bit(BTUSB_BULK_RUNNING, &data->flags);
else
btusb_submit_bulk_urb(hdev);
}
}
static int btusb_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
struct usb_endpoint_descriptor *ep_desc;
struct btusb_data *data;
struct hci_dev *hdev;
int i, err;
BT_DBG("intf %p id %p", intf, id);
if (intf->cur_altsetting->desc.bInterfaceNumber != 0)
return -ENODEV;
if (!id->driver_info) {
const struct usb_device_id *match;
match = usb_match_id(intf, blacklist_table);
if (match)
id = match;
}
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
for (i = 0; i < intf->cur_altsetting->desc.bNumEndpoints; i++) {
ep_desc = &intf->cur_altsetting->endpoint[i].desc;
if (!data->intr_ep && usb_endpoint_is_int_in(ep_desc)) {
data->intr_ep = ep_desc;
continue;
}
if (!data->bulk_tx_ep && usb_endpoint_is_bulk_out(ep_desc)) {
data->bulk_tx_ep = ep_desc;
continue;
}
if (!data->bulk_rx_ep && usb_endpoint_is_bulk_in(ep_desc)) {
data->bulk_rx_ep = ep_desc;
continue;
}
}
if (!data->intr_ep || !data->bulk_tx_ep || !data->bulk_rx_ep) {
kfree(data);
return -ENODEV;
}
data->udev = interface_to_usbdev(intf);
spin_lock_init(&data->lock);
INIT_WORK(&data->work, btusb_work);
init_usb_anchor(&data->tx_anchor);
init_usb_anchor(&data->intr_anchor);
init_usb_anchor(&data->bulk_anchor);
hdev = hci_alloc_dev();
if (!hdev) {
kfree(data);
return -ENOMEM;
}
hdev->type = HCI_USB;
hdev->driver_data = data;
data->hdev = hdev;
SET_HCIDEV_DEV(hdev, &intf->dev);
hdev->open = btusb_open;
hdev->close = btusb_close;
hdev->flush = btusb_flush;
hdev->send = btusb_send_frame;
hdev->destruct = btusb_destruct;
hdev->notify = btusb_notify;
hdev->owner = THIS_MODULE;
set_bit(HCI_QUIRK_RESET_ON_INIT, &hdev->quirks);
err = hci_register_dev(hdev);
if (err < 0) {
hci_free_dev(hdev);
kfree(data);
return err;
}
usb_set_intfdata(intf, data);
return 0;
}
static void btusb_disconnect(struct usb_interface *intf)
{
struct btusb_data *data = usb_get_intfdata(intf);
struct hci_dev *hdev;
BT_DBG("intf %p", intf);
if (!data)
return;
hdev = data->hdev;
usb_set_intfdata(intf, NULL);
hci_unregister_dev(hdev);
hci_free_dev(hdev);
}
static struct usb_driver btusb_driver = {
.name = "btusb",
.probe = btusb_probe,
.disconnect = btusb_disconnect,
.id_table = btusb_table,
};
static int __init btusb_init(void)
{
BT_INFO("Generic Bluetooth USB driver ver %s", VERSION);
return usb_register(&btusb_driver);
}
static void __exit btusb_exit(void)
{
usb_deregister(&btusb_driver);
}
module_init(btusb_init);
module_exit(btusb_exit);
MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
MODULE_DESCRIPTION("Generic Bluetooth USB driver ver " VERSION);
MODULE_VERSION(VERSION);
MODULE_LICENSE("GPL");