linux/drivers/bluetooth/bpa10x.c

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/*
*
* Digianswer Bluetooth USB driver
*
* Copyright (C) 2004-2005 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/errno.h>
#include <linux/usb.h>
#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
#ifndef CONFIG_BT_HCIBPA10X_DEBUG
#undef BT_DBG
#define BT_DBG(D...)
#endif
#define VERSION "0.8"
static int ignore = 0;
static struct usb_device_id bpa10x_table[] = {
/* Tektronix BPA 100/105 (Digianswer) */
{ USB_DEVICE(0x08fd, 0x0002) },
{ } /* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, bpa10x_table);
#define BPA10X_CMD_EP 0x00
#define BPA10X_EVT_EP 0x81
#define BPA10X_TX_EP 0x02
#define BPA10X_RX_EP 0x82
#define BPA10X_CMD_BUF_SIZE 252
#define BPA10X_EVT_BUF_SIZE 16
#define BPA10X_TX_BUF_SIZE 384
#define BPA10X_RX_BUF_SIZE 384
struct bpa10x_data {
struct hci_dev *hdev;
struct usb_device *udev;
rwlock_t lock;
struct sk_buff_head cmd_queue;
struct urb *cmd_urb;
struct urb *evt_urb;
struct sk_buff *evt_skb;
unsigned int evt_len;
struct sk_buff_head tx_queue;
struct urb *tx_urb;
struct urb *rx_urb;
};
#define HCI_VENDOR_HDR_SIZE 5
struct hci_vendor_hdr {
__u8 type;
__u16 snum;
__u16 dlen;
} __attribute__ ((packed));
static void bpa10x_recv_bulk(struct bpa10x_data *data, unsigned char *buf, int count)
{
struct hci_acl_hdr *ah;
struct hci_sco_hdr *sh;
struct hci_vendor_hdr *vh;
struct sk_buff *skb;
int len;
while (count) {
switch (*buf++) {
case HCI_ACLDATA_PKT:
ah = (struct hci_acl_hdr *) buf;
len = HCI_ACL_HDR_SIZE + __le16_to_cpu(ah->dlen);
skb = bt_skb_alloc(len, GFP_ATOMIC);
if (skb) {
memcpy(skb_put(skb, len), buf, len);
skb->dev = (void *) data->hdev;
skb->pkt_type = HCI_ACLDATA_PKT;
hci_recv_frame(skb);
}
break;
case HCI_SCODATA_PKT:
sh = (struct hci_sco_hdr *) buf;
len = HCI_SCO_HDR_SIZE + sh->dlen;
skb = bt_skb_alloc(len, GFP_ATOMIC);
if (skb) {
memcpy(skb_put(skb, len), buf, len);
skb->dev = (void *) data->hdev;
skb->pkt_type = HCI_SCODATA_PKT;
hci_recv_frame(skb);
}
break;
case HCI_VENDOR_PKT:
vh = (struct hci_vendor_hdr *) buf;
len = HCI_VENDOR_HDR_SIZE + __le16_to_cpu(vh->dlen);
skb = bt_skb_alloc(len, GFP_ATOMIC);
if (skb) {
memcpy(skb_put(skb, len), buf, len);
skb->dev = (void *) data->hdev;
skb->pkt_type = HCI_VENDOR_PKT;
hci_recv_frame(skb);
}
break;
default:
len = count - 1;
break;
}
buf += len;
count -= (len + 1);
}
}
static int bpa10x_recv_event(struct bpa10x_data *data, unsigned char *buf, int size)
{
BT_DBG("data %p buf %p size %d", data, buf, size);
if (data->evt_skb) {
struct sk_buff *skb = data->evt_skb;
memcpy(skb_put(skb, size), buf, size);
if (skb->len == data->evt_len) {
data->evt_skb = NULL;
data->evt_len = 0;
hci_recv_frame(skb);
}
} else {
struct sk_buff *skb;
struct hci_event_hdr *hdr;
unsigned char pkt_type;
int pkt_len = 0;
if (size < HCI_EVENT_HDR_SIZE + 1) {
BT_ERR("%s event packet block with size %d is too short",
data->hdev->name, size);
return -EILSEQ;
}
pkt_type = *buf++;
size--;
if (pkt_type != HCI_EVENT_PKT) {
BT_ERR("%s unexpected event packet start byte 0x%02x",
data->hdev->name, pkt_type);
return -EPROTO;
}
hdr = (struct hci_event_hdr *) buf;
pkt_len = HCI_EVENT_HDR_SIZE + hdr->plen;
skb = bt_skb_alloc(pkt_len, GFP_ATOMIC);
if (!skb) {
BT_ERR("%s no memory for new event packet",
data->hdev->name);
return -ENOMEM;
}
skb->dev = (void *) data->hdev;
skb->pkt_type = pkt_type;
memcpy(skb_put(skb, size), buf, size);
if (pkt_len == size) {
hci_recv_frame(skb);
} else {
data->evt_skb = skb;
data->evt_len = pkt_len;
}
}
return 0;
}
static void bpa10x_wakeup(struct bpa10x_data *data)
{
struct urb *urb;
struct sk_buff *skb;
int err;
BT_DBG("data %p", data);
urb = data->cmd_urb;
if (urb->status == -EINPROGRESS)
skb = NULL;
else
skb = skb_dequeue(&data->cmd_queue);
if (skb) {
struct usb_ctrlrequest *cr;
if (skb->len > BPA10X_CMD_BUF_SIZE) {
BT_ERR("%s command packet with size %d is too big",
data->hdev->name, skb->len);
kfree_skb(skb);
return;
}
cr = (struct usb_ctrlrequest *) urb->setup_packet;
cr->wLength = __cpu_to_le16(skb->len);
memcpy(urb->transfer_buffer, skb->data, skb->len);
urb->transfer_buffer_length = skb->len;
err = usb_submit_urb(urb, GFP_ATOMIC);
if (err < 0 && err != -ENODEV) {
BT_ERR("%s submit failed for command urb %p with error %d",
data->hdev->name, urb, err);
skb_queue_head(&data->cmd_queue, skb);
} else
kfree_skb(skb);
}
urb = data->tx_urb;
if (urb->status == -EINPROGRESS)
skb = NULL;
else
skb = skb_dequeue(&data->tx_queue);
if (skb) {
memcpy(urb->transfer_buffer, skb->data, skb->len);
urb->transfer_buffer_length = skb->len;
err = usb_submit_urb(urb, GFP_ATOMIC);
if (err < 0 && err != -ENODEV) {
BT_ERR("%s submit failed for command urb %p with error %d",
data->hdev->name, urb, err);
skb_queue_head(&data->tx_queue, skb);
} else
kfree_skb(skb);
}
}
static void bpa10x_complete(struct urb *urb, struct pt_regs *regs)
{
struct bpa10x_data *data = urb->context;
unsigned char *buf = urb->transfer_buffer;
int err, count = urb->actual_length;
BT_DBG("data %p urb %p buf %p count %d", data, urb, buf, count);
read_lock(&data->lock);
if (!test_bit(HCI_RUNNING, &data->hdev->flags))
goto unlock;
if (urb->status < 0 || !count)
goto resubmit;
if (usb_pipein(urb->pipe)) {
data->hdev->stat.byte_rx += count;
if (usb_pipetype(urb->pipe) == PIPE_INTERRUPT)
bpa10x_recv_event(data, buf, count);
if (usb_pipetype(urb->pipe) == PIPE_BULK)
bpa10x_recv_bulk(data, buf, count);
} else {
data->hdev->stat.byte_tx += count;
bpa10x_wakeup(data);
}
resubmit:
if (usb_pipein(urb->pipe)) {
err = usb_submit_urb(urb, GFP_ATOMIC);
if (err < 0 && err != -ENODEV) {
BT_ERR("%s urb %p type %d resubmit status %d",
data->hdev->name, urb, usb_pipetype(urb->pipe), err);
}
}
unlock:
read_unlock(&data->lock);
}
static inline struct urb *bpa10x_alloc_urb(struct usb_device *udev, unsigned int pipe, size_t size, int flags, void *data)
{
struct urb *urb;
struct usb_ctrlrequest *cr;
unsigned char *buf;
BT_DBG("udev %p data %p", udev, data);
urb = usb_alloc_urb(0, flags);
if (!urb)
return NULL;
buf = kmalloc(size, flags);
if (!buf) {
usb_free_urb(urb);
return NULL;
}
switch (usb_pipetype(pipe)) {
case PIPE_CONTROL:
cr = kmalloc(sizeof(*cr), flags);
if (!cr) {
kfree(buf);
usb_free_urb(urb);
return NULL;
}
cr->bRequestType = USB_TYPE_VENDOR;
cr->bRequest = 0;
cr->wIndex = 0;
cr->wValue = 0;
cr->wLength = __cpu_to_le16(0);
usb_fill_control_urb(urb, udev, pipe, (void *) cr, buf, 0, bpa10x_complete, data);
break;
case PIPE_INTERRUPT:
usb_fill_int_urb(urb, udev, pipe, buf, size, bpa10x_complete, data, 1);
break;
case PIPE_BULK:
usb_fill_bulk_urb(urb, udev, pipe, buf, size, bpa10x_complete, data);
break;
default:
kfree(buf);
usb_free_urb(urb);
return NULL;
}
return urb;
}
static inline void bpa10x_free_urb(struct urb *urb)
{
BT_DBG("urb %p", urb);
if (!urb)
return;
kfree(urb->setup_packet);
kfree(urb->transfer_buffer);
usb_free_urb(urb);
}
static int bpa10x_open(struct hci_dev *hdev)
{
struct bpa10x_data *data = hdev->driver_data;
struct usb_device *udev = data->udev;
unsigned long flags;
int err;
BT_DBG("hdev %p data %p", hdev, data);
if (test_and_set_bit(HCI_RUNNING, &hdev->flags))
return 0;
data->cmd_urb = bpa10x_alloc_urb(udev, usb_sndctrlpipe(udev, BPA10X_CMD_EP),
BPA10X_CMD_BUF_SIZE, GFP_KERNEL, data);
if (!data->cmd_urb) {
err = -ENOMEM;
goto done;
}
data->evt_urb = bpa10x_alloc_urb(udev, usb_rcvintpipe(udev, BPA10X_EVT_EP),
BPA10X_EVT_BUF_SIZE, GFP_KERNEL, data);
if (!data->evt_urb) {
bpa10x_free_urb(data->cmd_urb);
err = -ENOMEM;
goto done;
}
data->rx_urb = bpa10x_alloc_urb(udev, usb_rcvbulkpipe(udev, BPA10X_RX_EP),
BPA10X_RX_BUF_SIZE, GFP_KERNEL, data);
if (!data->rx_urb) {
bpa10x_free_urb(data->evt_urb);
bpa10x_free_urb(data->cmd_urb);
err = -ENOMEM;
goto done;
}
data->tx_urb = bpa10x_alloc_urb(udev, usb_sndbulkpipe(udev, BPA10X_TX_EP),
BPA10X_TX_BUF_SIZE, GFP_KERNEL, data);
if (!data->rx_urb) {
bpa10x_free_urb(data->rx_urb);
bpa10x_free_urb(data->evt_urb);
bpa10x_free_urb(data->cmd_urb);
err = -ENOMEM;
goto done;
}
write_lock_irqsave(&data->lock, flags);
err = usb_submit_urb(data->evt_urb, GFP_ATOMIC);
if (err < 0) {
BT_ERR("%s submit failed for event urb %p with error %d",
data->hdev->name, data->evt_urb, err);
} else {
err = usb_submit_urb(data->rx_urb, GFP_ATOMIC);
if (err < 0) {
BT_ERR("%s submit failed for rx urb %p with error %d",
data->hdev->name, data->evt_urb, err);
usb_kill_urb(data->evt_urb);
}
}
write_unlock_irqrestore(&data->lock, flags);
done:
if (err < 0)
clear_bit(HCI_RUNNING, &hdev->flags);
return err;
}
static int bpa10x_close(struct hci_dev *hdev)
{
struct bpa10x_data *data = hdev->driver_data;
unsigned long flags;
BT_DBG("hdev %p data %p", hdev, data);
if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
return 0;
write_lock_irqsave(&data->lock, flags);
skb_queue_purge(&data->cmd_queue);
usb_kill_urb(data->cmd_urb);
usb_kill_urb(data->evt_urb);
usb_kill_urb(data->rx_urb);
usb_kill_urb(data->tx_urb);
write_unlock_irqrestore(&data->lock, flags);
bpa10x_free_urb(data->cmd_urb);
bpa10x_free_urb(data->evt_urb);
bpa10x_free_urb(data->rx_urb);
bpa10x_free_urb(data->tx_urb);
return 0;
}
static int bpa10x_flush(struct hci_dev *hdev)
{
struct bpa10x_data *data = hdev->driver_data;
BT_DBG("hdev %p data %p", hdev, data);
skb_queue_purge(&data->cmd_queue);
return 0;
}
static int bpa10x_send_frame(struct sk_buff *skb)
{
struct hci_dev *hdev = (struct hci_dev *) skb->dev;
struct bpa10x_data *data;
BT_DBG("hdev %p skb %p type %d len %d", hdev, skb, skb->pkt_type, skb->len);
if (!hdev) {
BT_ERR("Frame for unknown HCI device");
return -ENODEV;
}
if (!test_bit(HCI_RUNNING, &hdev->flags))
return -EBUSY;
data = hdev->driver_data;
/* Prepend skb with frame type */
memcpy(skb_push(skb, 1), &(skb->pkt_type), 1);
switch (skb->pkt_type) {
case HCI_COMMAND_PKT:
hdev->stat.cmd_tx++;
skb_queue_tail(&data->cmd_queue, skb);
break;
case HCI_ACLDATA_PKT:
hdev->stat.acl_tx++;
skb_queue_tail(&data->tx_queue, skb);
break;
case HCI_SCODATA_PKT:
hdev->stat.sco_tx++;
skb_queue_tail(&data->tx_queue, skb);
break;
};
read_lock(&data->lock);
bpa10x_wakeup(data);
read_unlock(&data->lock);
return 0;
}
static void bpa10x_destruct(struct hci_dev *hdev)
{
struct bpa10x_data *data = hdev->driver_data;
BT_DBG("hdev %p data %p", hdev, data);
kfree(data);
}
static int bpa10x_probe(struct usb_interface *intf, const struct usb_device_id *id)
{
struct usb_device *udev = interface_to_usbdev(intf);
struct hci_dev *hdev;
struct bpa10x_data *data;
int err;
BT_DBG("intf %p id %p", intf, id);
if (ignore)
return -ENODEV;
data = kmalloc(sizeof(*data), GFP_KERNEL);
if (!data) {
BT_ERR("Can't allocate data structure");
return -ENOMEM;
}
memset(data, 0, sizeof(*data));
data->udev = udev;
rwlock_init(&data->lock);
skb_queue_head_init(&data->cmd_queue);
skb_queue_head_init(&data->tx_queue);
hdev = hci_alloc_dev();
if (!hdev) {
BT_ERR("Can't allocate HCI device");
kfree(data);
return -ENOMEM;
}
data->hdev = hdev;
hdev->type = HCI_USB;
hdev->driver_data = data;
SET_HCIDEV_DEV(hdev, &intf->dev);
hdev->open = bpa10x_open;
hdev->close = bpa10x_close;
hdev->flush = bpa10x_flush;
hdev->send = bpa10x_send_frame;
hdev->destruct = bpa10x_destruct;
hdev->owner = THIS_MODULE;
err = hci_register_dev(hdev);
if (err < 0) {
BT_ERR("Can't register HCI device");
kfree(data);
hci_free_dev(hdev);
return err;
}
usb_set_intfdata(intf, data);
return 0;
}
static void bpa10x_disconnect(struct usb_interface *intf)
{
struct bpa10x_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);
if (hci_unregister_dev(hdev) < 0)
BT_ERR("Can't unregister HCI device %s", hdev->name);
hci_free_dev(hdev);
}
static struct usb_driver bpa10x_driver = {
.owner = THIS_MODULE,
.name = "bpa10x",
.probe = bpa10x_probe,
.disconnect = bpa10x_disconnect,
.id_table = bpa10x_table,
};
static int __init bpa10x_init(void)
{
int err;
BT_INFO("Digianswer Bluetooth USB driver ver %s", VERSION);
err = usb_register(&bpa10x_driver);
if (err < 0)
BT_ERR("Failed to register USB driver");
return err;
}
static void __exit bpa10x_exit(void)
{
usb_deregister(&bpa10x_driver);
}
module_init(bpa10x_init);
module_exit(bpa10x_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("Digianswer Bluetooth USB driver ver " VERSION);
MODULE_VERSION(VERSION);
MODULE_LICENSE("GPL");