/* * * Bluetooth virtual HCI driver * * Copyright (C) 2000-2001 Qualcomm Incorporated * Copyright (C) 2002-2003 Maxim Krasnyansky <maxk@qualcomm.com> * Copyright (C) 2004-2006 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/sched.h> #include <linux/poll.h> #include <linux/skbuff.h> #include <linux/miscdevice.h> #include <net/bluetooth/bluetooth.h> #include <net/bluetooth/hci_core.h> #define VERSION "1.3" struct vhci_data { struct hci_dev *hdev; unsigned long flags; wait_queue_head_t read_wait; struct sk_buff_head readq; }; static int vhci_open_dev(struct hci_dev *hdev) { set_bit(HCI_RUNNING, &hdev->flags); return 0; } static int vhci_close_dev(struct hci_dev *hdev) { struct vhci_data *data = hdev->driver_data; if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags)) return 0; skb_queue_purge(&data->readq); return 0; } static int vhci_flush(struct hci_dev *hdev) { struct vhci_data *data = hdev->driver_data; skb_queue_purge(&data->readq); return 0; } static int vhci_send_frame(struct sk_buff *skb) { struct hci_dev* hdev = (struct hci_dev *) skb->dev; struct vhci_data *data; if (!hdev) { BT_ERR("Frame for unknown HCI device (hdev=NULL)"); return -ENODEV; } if (!test_bit(HCI_RUNNING, &hdev->flags)) return -EBUSY; data = hdev->driver_data; memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1); skb_queue_tail(&data->readq, skb); wake_up_interruptible(&data->read_wait); return 0; } static void vhci_destruct(struct hci_dev *hdev) { kfree(hdev->driver_data); } static inline ssize_t vhci_get_user(struct vhci_data *data, const char __user *buf, size_t count) { struct sk_buff *skb; if (count > HCI_MAX_FRAME_SIZE) return -EINVAL; skb = bt_skb_alloc(count, GFP_KERNEL); if (!skb) return -ENOMEM; if (copy_from_user(skb_put(skb, count), buf, count)) { kfree_skb(skb); return -EFAULT; } skb->dev = (void *) data->hdev; bt_cb(skb)->pkt_type = *((__u8 *) skb->data); skb_pull(skb, 1); hci_recv_frame(skb); return count; } static inline ssize_t vhci_put_user(struct vhci_data *data, struct sk_buff *skb, char __user *buf, int count) { char __user *ptr = buf; int len, total = 0; len = min_t(unsigned int, skb->len, count); if (copy_to_user(ptr, skb->data, len)) return -EFAULT; total += len; data->hdev->stat.byte_tx += len; switch (bt_cb(skb)->pkt_type) { case HCI_COMMAND_PKT: data->hdev->stat.cmd_tx++; break; case HCI_ACLDATA_PKT: data->hdev->stat.acl_tx++; break; case HCI_SCODATA_PKT: data->hdev->stat.sco_tx++; break; }; return total; } static ssize_t vhci_read(struct file *file, char __user *buf, size_t count, loff_t *pos) { struct vhci_data *data = file->private_data; struct sk_buff *skb; ssize_t ret = 0; while (count) { skb = skb_dequeue(&data->readq); if (skb) { ret = vhci_put_user(data, skb, buf, count); if (ret < 0) skb_queue_head(&data->readq, skb); else kfree_skb(skb); break; } if (file->f_flags & O_NONBLOCK) { ret = -EAGAIN; break; } ret = wait_event_interruptible(data->read_wait, !skb_queue_empty(&data->readq)); if (ret < 0) break; } return ret; } static ssize_t vhci_write(struct file *file, const char __user *buf, size_t count, loff_t *pos) { struct vhci_data *data = file->private_data; return vhci_get_user(data, buf, count); } static unsigned int vhci_poll(struct file *file, poll_table *wait) { struct vhci_data *data = file->private_data; poll_wait(file, &data->read_wait, wait); if (!skb_queue_empty(&data->readq)) return POLLIN | POLLRDNORM; return POLLOUT | POLLWRNORM; } static int vhci_open(struct inode *inode, struct file *file) { struct vhci_data *data; struct hci_dev *hdev; data = kzalloc(sizeof(struct vhci_data), GFP_KERNEL); if (!data) return -ENOMEM; skb_queue_head_init(&data->readq); init_waitqueue_head(&data->read_wait); hdev = hci_alloc_dev(); if (!hdev) { kfree(data); return -ENOMEM; } data->hdev = hdev; hdev->bus = HCI_VIRTUAL; hdev->driver_data = data; hdev->open = vhci_open_dev; hdev->close = vhci_close_dev; hdev->flush = vhci_flush; hdev->send = vhci_send_frame; hdev->destruct = vhci_destruct; hdev->owner = THIS_MODULE; if (hci_register_dev(hdev) < 0) { BT_ERR("Can't register HCI device"); kfree(data); hci_free_dev(hdev); return -EBUSY; } file->private_data = data; return nonseekable_open(inode, file); } static int vhci_release(struct inode *inode, struct file *file) { struct vhci_data *data = file->private_data; struct hci_dev *hdev = data->hdev; if (hci_unregister_dev(hdev) < 0) { BT_ERR("Can't unregister HCI device %s", hdev->name); } hci_free_dev(hdev); file->private_data = NULL; return 0; } static const struct file_operations vhci_fops = { .owner = THIS_MODULE, .read = vhci_read, .write = vhci_write, .poll = vhci_poll, .open = vhci_open, .release = vhci_release, }; static struct miscdevice vhci_miscdev= { .name = "vhci", .fops = &vhci_fops, .minor = MISC_DYNAMIC_MINOR, }; static int __init vhci_init(void) { BT_INFO("Virtual HCI driver ver %s", VERSION); return misc_register(&vhci_miscdev); } static void __exit vhci_exit(void) { misc_deregister(&vhci_miscdev); } module_init(vhci_init); module_exit(vhci_exit); MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); MODULE_DESCRIPTION("Bluetooth virtual HCI driver ver " VERSION); MODULE_VERSION(VERSION); MODULE_LICENSE("GPL");