1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
365 lines
8.4 KiB
C
365 lines
8.4 KiB
C
/*
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BlueZ - Bluetooth protocol stack for Linux
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Copyright (C) 2000-2001 Qualcomm Incorporated
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Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License version 2 as
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published by the Free Software Foundation;
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
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IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
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CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
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COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
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SOFTWARE IS DISCLAIMED.
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*/
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/*
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* Bluetooth HCI virtual device driver.
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*
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* $Id: hci_vhci.c,v 1.3 2002/04/17 17:37:20 maxk Exp $
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*/
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#define VERSION "1.1"
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/major.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/poll.h>
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#include <linux/fcntl.h>
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#include <linux/init.h>
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#include <linux/random.h>
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#include <linux/skbuff.h>
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#include <linux/miscdevice.h>
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#include <asm/system.h>
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#include <asm/uaccess.h>
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#include <net/bluetooth/bluetooth.h>
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#include <net/bluetooth/hci_core.h>
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#include "hci_vhci.h"
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/* HCI device part */
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static int hci_vhci_open(struct hci_dev *hdev)
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{
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set_bit(HCI_RUNNING, &hdev->flags);
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return 0;
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}
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static int hci_vhci_flush(struct hci_dev *hdev)
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{
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struct hci_vhci_struct *hci_vhci = (struct hci_vhci_struct *) hdev->driver_data;
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skb_queue_purge(&hci_vhci->readq);
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return 0;
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}
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static int hci_vhci_close(struct hci_dev *hdev)
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{
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if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
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return 0;
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hci_vhci_flush(hdev);
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return 0;
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}
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static void hci_vhci_destruct(struct hci_dev *hdev)
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{
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struct hci_vhci_struct *vhci;
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if (!hdev) return;
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vhci = (struct hci_vhci_struct *) hdev->driver_data;
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kfree(vhci);
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}
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static int hci_vhci_send_frame(struct sk_buff *skb)
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{
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struct hci_dev* hdev = (struct hci_dev *) skb->dev;
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struct hci_vhci_struct *hci_vhci;
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if (!hdev) {
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BT_ERR("Frame for uknown device (hdev=NULL)");
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return -ENODEV;
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}
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if (!test_bit(HCI_RUNNING, &hdev->flags))
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return -EBUSY;
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hci_vhci = (struct hci_vhci_struct *) hdev->driver_data;
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memcpy(skb_push(skb, 1), &skb->pkt_type, 1);
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skb_queue_tail(&hci_vhci->readq, skb);
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if (hci_vhci->flags & VHCI_FASYNC)
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kill_fasync(&hci_vhci->fasync, SIGIO, POLL_IN);
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wake_up_interruptible(&hci_vhci->read_wait);
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return 0;
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}
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/* Character device part */
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/* Poll */
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static unsigned int hci_vhci_chr_poll(struct file *file, poll_table * wait)
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{
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struct hci_vhci_struct *hci_vhci = (struct hci_vhci_struct *) file->private_data;
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poll_wait(file, &hci_vhci->read_wait, wait);
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if (skb_queue_len(&hci_vhci->readq))
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return POLLIN | POLLRDNORM;
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return POLLOUT | POLLWRNORM;
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}
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/* Get packet from user space buffer(already verified) */
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static inline ssize_t hci_vhci_get_user(struct hci_vhci_struct *hci_vhci, const char __user *buf, size_t count)
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{
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struct sk_buff *skb;
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if (count > HCI_MAX_FRAME_SIZE)
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return -EINVAL;
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if (!(skb = bt_skb_alloc(count, GFP_KERNEL)))
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return -ENOMEM;
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if (copy_from_user(skb_put(skb, count), buf, count)) {
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kfree_skb(skb);
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return -EFAULT;
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}
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skb->dev = (void *) hci_vhci->hdev;
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skb->pkt_type = *((__u8 *) skb->data);
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skb_pull(skb, 1);
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hci_recv_frame(skb);
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return count;
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}
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/* Write */
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static ssize_t hci_vhci_chr_write(struct file * file, const char __user * buf,
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size_t count, loff_t *pos)
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{
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struct hci_vhci_struct *hci_vhci = (struct hci_vhci_struct *) file->private_data;
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if (!access_ok(VERIFY_READ, buf, count))
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return -EFAULT;
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return hci_vhci_get_user(hci_vhci, buf, count);
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}
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/* Put packet to user space buffer(already verified) */
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static inline ssize_t hci_vhci_put_user(struct hci_vhci_struct *hci_vhci,
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struct sk_buff *skb, char __user *buf,
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int count)
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{
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int len = count, total = 0;
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char __user *ptr = buf;
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len = min_t(unsigned int, skb->len, len);
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if (copy_to_user(ptr, skb->data, len))
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return -EFAULT;
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total += len;
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hci_vhci->hdev->stat.byte_tx += len;
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switch (skb->pkt_type) {
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case HCI_COMMAND_PKT:
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hci_vhci->hdev->stat.cmd_tx++;
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break;
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case HCI_ACLDATA_PKT:
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hci_vhci->hdev->stat.acl_tx++;
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break;
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case HCI_SCODATA_PKT:
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hci_vhci->hdev->stat.cmd_tx++;
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break;
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};
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return total;
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}
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/* Read */
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static ssize_t hci_vhci_chr_read(struct file * file, char __user * buf, size_t count, loff_t *pos)
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{
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struct hci_vhci_struct *hci_vhci = (struct hci_vhci_struct *) file->private_data;
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DECLARE_WAITQUEUE(wait, current);
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struct sk_buff *skb;
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ssize_t ret = 0;
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add_wait_queue(&hci_vhci->read_wait, &wait);
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while (count) {
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set_current_state(TASK_INTERRUPTIBLE);
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/* Read frames from device queue */
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if (!(skb = skb_dequeue(&hci_vhci->readq))) {
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if (file->f_flags & O_NONBLOCK) {
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ret = -EAGAIN;
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break;
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}
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if (signal_pending(current)) {
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ret = -ERESTARTSYS;
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break;
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}
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/* Nothing to read, let's sleep */
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schedule();
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continue;
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}
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if (access_ok(VERIFY_WRITE, buf, count))
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ret = hci_vhci_put_user(hci_vhci, skb, buf, count);
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else
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ret = -EFAULT;
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kfree_skb(skb);
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break;
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}
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set_current_state(TASK_RUNNING);
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remove_wait_queue(&hci_vhci->read_wait, &wait);
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return ret;
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}
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static loff_t hci_vhci_chr_lseek(struct file * file, loff_t offset, int origin)
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{
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return -ESPIPE;
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}
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static int hci_vhci_chr_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
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{
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return -EINVAL;
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}
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static int hci_vhci_chr_fasync(int fd, struct file *file, int on)
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{
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struct hci_vhci_struct *hci_vhci = (struct hci_vhci_struct *) file->private_data;
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int ret;
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if ((ret = fasync_helper(fd, file, on, &hci_vhci->fasync)) < 0)
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return ret;
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if (on)
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hci_vhci->flags |= VHCI_FASYNC;
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else
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hci_vhci->flags &= ~VHCI_FASYNC;
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return 0;
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}
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static int hci_vhci_chr_open(struct inode *inode, struct file * file)
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{
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struct hci_vhci_struct *hci_vhci = NULL;
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struct hci_dev *hdev;
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if (!(hci_vhci = kmalloc(sizeof(struct hci_vhci_struct), GFP_KERNEL)))
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return -ENOMEM;
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memset(hci_vhci, 0, sizeof(struct hci_vhci_struct));
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skb_queue_head_init(&hci_vhci->readq);
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init_waitqueue_head(&hci_vhci->read_wait);
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/* Initialize and register HCI device */
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hdev = hci_alloc_dev();
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if (!hdev) {
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kfree(hci_vhci);
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return -ENOMEM;
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}
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hci_vhci->hdev = hdev;
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hdev->type = HCI_VHCI;
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hdev->driver_data = hci_vhci;
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hdev->open = hci_vhci_open;
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hdev->close = hci_vhci_close;
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hdev->flush = hci_vhci_flush;
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hdev->send = hci_vhci_send_frame;
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hdev->destruct = hci_vhci_destruct;
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hdev->owner = THIS_MODULE;
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if (hci_register_dev(hdev) < 0) {
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kfree(hci_vhci);
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hci_free_dev(hdev);
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return -EBUSY;
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}
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file->private_data = hci_vhci;
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return nonseekable_open(inode, file);
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}
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static int hci_vhci_chr_close(struct inode *inode, struct file *file)
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{
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struct hci_vhci_struct *hci_vhci = (struct hci_vhci_struct *) file->private_data;
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struct hci_dev *hdev = hci_vhci->hdev;
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if (hci_unregister_dev(hdev) < 0) {
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BT_ERR("Can't unregister HCI device %s", hdev->name);
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}
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hci_free_dev(hdev);
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file->private_data = NULL;
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return 0;
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}
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static struct file_operations hci_vhci_fops = {
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.owner = THIS_MODULE,
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.llseek = hci_vhci_chr_lseek,
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.read = hci_vhci_chr_read,
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.write = hci_vhci_chr_write,
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.poll = hci_vhci_chr_poll,
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.ioctl = hci_vhci_chr_ioctl,
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.open = hci_vhci_chr_open,
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.release = hci_vhci_chr_close,
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.fasync = hci_vhci_chr_fasync
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};
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static struct miscdevice hci_vhci_miscdev=
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{
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VHCI_MINOR,
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"hci_vhci",
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&hci_vhci_fops
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};
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static int __init hci_vhci_init(void)
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{
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BT_INFO("VHCI driver ver %s", VERSION);
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if (misc_register(&hci_vhci_miscdev)) {
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BT_ERR("Can't register misc device %d\n", VHCI_MINOR);
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return -EIO;
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}
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return 0;
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}
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static void hci_vhci_cleanup(void)
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{
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misc_deregister(&hci_vhci_miscdev);
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}
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module_init(hci_vhci_init);
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module_exit(hci_vhci_cleanup);
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MODULE_AUTHOR("Maxim Krasnyansky <maxk@qualcomm.com>");
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MODULE_DESCRIPTION("Bluetooth VHCI driver ver " VERSION);
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MODULE_LICENSE("GPL");
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