hci_vhci.c
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上传日期:2013-02-24
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- /*
- BlueZ - Bluetooth protocol stack for Linux
- Copyright (C) 2000-2001 Qualcomm Incorporated
- Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License version 2 as
- published by the Free Software Foundation;
- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
- OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
- IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
- CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
- WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
- COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
- SOFTWARE IS DISCLAIMED.
- */
- /*
- * BlueZ HCI virtual device driver.
- *
- * $Id: hci_vhci.c,v 1.3 2001/08/03 04:19:50 maxk Exp $
- */
- #define VERSION "1.0"
- #include <linux/config.h>
- #include <linux/module.h>
- #include <linux/errno.h>
- #include <linux/kernel.h>
- #include <linux/major.h>
- #include <linux/sched.h>
- #include <linux/slab.h>
- #include <linux/poll.h>
- #include <linux/fcntl.h>
- #include <linux/init.h>
- #include <linux/random.h>
- #include <linux/skbuff.h>
- #include <linux/miscdevice.h>
- #include <asm/system.h>
- #include <asm/uaccess.h>
- #include <net/bluetooth/bluetooth.h>
- #include <net/bluetooth/bluez.h>
- #include <net/bluetooth/hci_core.h>
- #include <net/bluetooth/hci_vhci.h>
- /* HCI device part */
- int hci_vhci_open(struct hci_dev *hdev)
- {
- hdev->flags |= HCI_RUNNING;
- return 0;
- }
- int hci_vhci_flush(struct hci_dev *hdev)
- {
- struct hci_vhci_struct *hci_vhci = (struct hci_vhci_struct *) hdev->driver_data;
- skb_queue_purge(&hci_vhci->readq);
- return 0;
- }
- int hci_vhci_close(struct hci_dev *hdev)
- {
- hdev->flags &= ~HCI_RUNNING;
- hci_vhci_flush(hdev);
- return 0;
- }
- int hci_vhci_send_frame(struct sk_buff *skb)
- {
- struct hci_dev* hdev = (struct hci_dev *) skb->dev;
- struct hci_vhci_struct *hci_vhci;
- if (!hdev) {
- ERR("Frame for uknown device (hdev=NULL)");
- return -ENODEV;
- }
- if (!(hdev->flags & HCI_RUNNING))
- return -EBUSY;
- hci_vhci = (struct hci_vhci_struct *) hdev->driver_data;
- memcpy(skb_push(skb, 1), &skb->pkt_type, 1);
- skb_queue_tail(&hci_vhci->readq, skb);
- if (hci_vhci->flags & VHCI_FASYNC)
- kill_fasync(&hci_vhci->fasync, SIGIO, POLL_IN);
- wake_up_interruptible(&hci_vhci->read_wait);
- return 0;
- }
- /* Character device part */
- /* Poll */
- static unsigned int hci_vhci_chr_poll(struct file *file, poll_table * wait)
- {
- struct hci_vhci_struct *hci_vhci = (struct hci_vhci_struct *) file->private_data;
- poll_wait(file, &hci_vhci->read_wait, wait);
-
- if (skb_queue_len(&hci_vhci->readq))
- return POLLIN | POLLRDNORM;
- return POLLOUT | POLLWRNORM;
- }
- /* Get packet from user space buffer(already verified) */
- static inline ssize_t hci_vhci_get_user(struct hci_vhci_struct *hci_vhci, const char *buf, size_t count)
- {
- struct sk_buff *skb;
- if (count > HCI_MAX_FRAME_SIZE)
- return -EINVAL;
- if (!(skb = bluez_skb_alloc(count, GFP_KERNEL)))
- return -ENOMEM;
-
- copy_from_user(skb_put(skb, count), buf, count);
- skb->dev = (void *) &hci_vhci->hdev;
- skb->pkt_type = *((__u8 *) skb->data);
- skb_pull(skb, 1);
- hci_recv_frame(skb);
- return count;
- }
- /* Write */
- static ssize_t hci_vhci_chr_write(struct file * file, const char * buf,
- size_t count, loff_t *pos)
- {
- struct hci_vhci_struct *hci_vhci = (struct hci_vhci_struct *) file->private_data;
- if (verify_area(VERIFY_READ, buf, count))
- return -EFAULT;
- return hci_vhci_get_user(hci_vhci, buf, count);
- }
- /* Put packet to user space buffer(already verified) */
- static inline ssize_t hci_vhci_put_user(struct hci_vhci_struct *hci_vhci,
- struct sk_buff *skb, char *buf, int count)
- {
- int len = count, total = 0;
- char *ptr = buf;
- len = MIN(skb->len, len);
- copy_to_user(ptr, skb->data, len);
- total += len;
- hci_vhci->hdev.stat.byte_tx += len;
- switch (skb->pkt_type) {
- case HCI_COMMAND_PKT:
- hci_vhci->hdev.stat.cmd_tx++;
- break;
- case HCI_ACLDATA_PKT:
- hci_vhci->hdev.stat.acl_tx++;
- break;
- case HCI_SCODATA_PKT:
- hci_vhci->hdev.stat.cmd_tx++;
- break;
- };
- return total;
- }
- /* Read */
- static ssize_t hci_vhci_chr_read(struct file * file, char * buf, size_t count, loff_t *pos)
- {
- struct hci_vhci_struct *hci_vhci = (struct hci_vhci_struct *) file->private_data;
- DECLARE_WAITQUEUE(wait, current);
- struct sk_buff *skb;
- ssize_t ret = 0;
- add_wait_queue(&hci_vhci->read_wait, &wait);
- while (count) {
- current->state = TASK_INTERRUPTIBLE;
- /* Read frames from device queue */
- if (!(skb = skb_dequeue(&hci_vhci->readq))) {
- if (file->f_flags & O_NONBLOCK) {
- ret = -EAGAIN;
- break;
- }
- if (signal_pending(current)) {
- ret = -ERESTARTSYS;
- break;
- }
- /* Nothing to read, let's sleep */
- schedule();
- continue;
- }
- if (!verify_area(VERIFY_WRITE, buf, count))
- ret = hci_vhci_put_user(hci_vhci, skb, buf, count);
- else
- ret = -EFAULT;
- kfree_skb(skb);
- break;
- }
- current->state = TASK_RUNNING;
- remove_wait_queue(&hci_vhci->read_wait, &wait);
- return ret;
- }
- static loff_t hci_vhci_chr_lseek(struct file * file, loff_t offset, int origin)
- {
- return -ESPIPE;
- }
- static int hci_vhci_chr_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
- {
- return -EINVAL;
- }
- static int hci_vhci_chr_fasync(int fd, struct file *file, int on)
- {
- struct hci_vhci_struct *hci_vhci = (struct hci_vhci_struct *) file->private_data;
- int ret;
- if ((ret = fasync_helper(fd, file, on, &hci_vhci->fasync)) < 0)
- return ret;
-
- if (on)
- hci_vhci->flags |= VHCI_FASYNC;
- else
- hci_vhci->flags &= ~VHCI_FASYNC;
- return 0;
- }
- static int hci_vhci_chr_open(struct inode *inode, struct file * file)
- {
- struct hci_vhci_struct *hci_vhci = NULL;
- struct hci_dev *hdev;
- if (!(hci_vhci = kmalloc(sizeof(struct hci_vhci_struct), GFP_KERNEL)))
- return -ENOMEM;
- memset(hci_vhci, 0, sizeof(struct hci_vhci_struct));
- skb_queue_head_init(&hci_vhci->readq);
- init_waitqueue_head(&hci_vhci->read_wait);
- /* Initialize and register HCI device */
- hdev = &hci_vhci->hdev;
- hdev->type = HCI_VHCI;
- hdev->driver_data = hci_vhci;
- hdev->open = hci_vhci_open;
- hdev->close = hci_vhci_close;
- hdev->flush = hci_vhci_flush;
- hdev->send = hci_vhci_send_frame;
- if (hci_register_dev(hdev) < 0) {
- kfree(hci_vhci);
- return -EBUSY;
- }
- file->private_data = hci_vhci;
- return 0;
- }
- static int hci_vhci_chr_close(struct inode *inode, struct file *file)
- {
- struct hci_vhci_struct *hci_vhci = (struct hci_vhci_struct *) file->private_data;
- if (hci_unregister_dev(&hci_vhci->hdev) < 0) {
- ERR("Can't unregister HCI device %s", hci_vhci->hdev.name);
- }
- kfree(hci_vhci);
- file->private_data = NULL;
- return 0;
- }
- static struct file_operations hci_vhci_fops = {
- owner: THIS_MODULE,
- llseek: hci_vhci_chr_lseek,
- read: hci_vhci_chr_read,
- write: hci_vhci_chr_write,
- poll: hci_vhci_chr_poll,
- ioctl: hci_vhci_chr_ioctl,
- open: hci_vhci_chr_open,
- release:hci_vhci_chr_close,
- fasync: hci_vhci_chr_fasync
- };
- static struct miscdevice hci_vhci_miscdev=
- {
- VHCI_MINOR,
- "hci_vhci",
- &hci_vhci_fops
- };
- int __init hci_vhci_init(void)
- {
- INF("BlueZ VHCI driver ver %s Copyright (C) 2000,2001 Qualcomm Inc",
- VERSION);
- INF("Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>");
- if (misc_register(&hci_vhci_miscdev)) {
- ERR("Can't register misc device %dn", VHCI_MINOR);
- return -EIO;
- }
- return 0;
- }
- void hci_vhci_cleanup(void)
- {
- misc_deregister(&hci_vhci_miscdev);
- }
- module_init(hci_vhci_init);
- module_exit(hci_vhci_cleanup);
- MODULE_AUTHOR("Maxim Krasnyansky <maxk@qualcomm.com>");
- MODULE_DESCRIPTION("BlueZ VHCI driver ver " VERSION);
- MODULE_LICENSE("GPL");