ocfs2: Add metaecc for ocfs2_refcount_block.
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / bluetooth / hci_vhci.c
blob1df9dda2e377d8415366ae43fb1c44e57e2ed9d2
1 /*
3 * Bluetooth virtual HCI driver
5 * Copyright (C) 2000-2001 Qualcomm Incorporated
6 * Copyright (C) 2002-2003 Maxim Krasnyansky <maxk@qualcomm.com>
7 * Copyright (C) 2004-2006 Marcel Holtmann <marcel@holtmann.org>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26 #include <linux/module.h>
28 #include <linux/kernel.h>
29 #include <linux/init.h>
30 #include <linux/slab.h>
31 #include <linux/smp_lock.h>
32 #include <linux/types.h>
33 #include <linux/errno.h>
34 #include <linux/sched.h>
35 #include <linux/poll.h>
37 #include <linux/skbuff.h>
38 #include <linux/miscdevice.h>
40 #include <net/bluetooth/bluetooth.h>
41 #include <net/bluetooth/hci_core.h>
43 #define VERSION "1.3"
45 static int minor = MISC_DYNAMIC_MINOR;
47 struct vhci_data {
48 struct hci_dev *hdev;
50 unsigned long flags;
52 wait_queue_head_t read_wait;
53 struct sk_buff_head readq;
56 static int vhci_open_dev(struct hci_dev *hdev)
58 set_bit(HCI_RUNNING, &hdev->flags);
60 return 0;
63 static int vhci_close_dev(struct hci_dev *hdev)
65 struct vhci_data *data = hdev->driver_data;
67 if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
68 return 0;
70 skb_queue_purge(&data->readq);
72 return 0;
75 static int vhci_flush(struct hci_dev *hdev)
77 struct vhci_data *data = hdev->driver_data;
79 skb_queue_purge(&data->readq);
81 return 0;
84 static int vhci_send_frame(struct sk_buff *skb)
86 struct hci_dev* hdev = (struct hci_dev *) skb->dev;
87 struct vhci_data *data;
89 if (!hdev) {
90 BT_ERR("Frame for unknown HCI device (hdev=NULL)");
91 return -ENODEV;
94 if (!test_bit(HCI_RUNNING, &hdev->flags))
95 return -EBUSY;
97 data = hdev->driver_data;
99 memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
100 skb_queue_tail(&data->readq, skb);
102 wake_up_interruptible(&data->read_wait);
104 return 0;
107 static void vhci_destruct(struct hci_dev *hdev)
109 kfree(hdev->driver_data);
112 static inline ssize_t vhci_get_user(struct vhci_data *data,
113 const char __user *buf, size_t count)
115 struct sk_buff *skb;
117 if (count > HCI_MAX_FRAME_SIZE)
118 return -EINVAL;
120 skb = bt_skb_alloc(count, GFP_KERNEL);
121 if (!skb)
122 return -ENOMEM;
124 if (copy_from_user(skb_put(skb, count), buf, count)) {
125 kfree_skb(skb);
126 return -EFAULT;
129 skb->dev = (void *) data->hdev;
130 bt_cb(skb)->pkt_type = *((__u8 *) skb->data);
131 skb_pull(skb, 1);
133 hci_recv_frame(skb);
135 return count;
138 static inline ssize_t vhci_put_user(struct vhci_data *data,
139 struct sk_buff *skb, char __user *buf, int count)
141 char __user *ptr = buf;
142 int len, total = 0;
144 len = min_t(unsigned int, skb->len, count);
146 if (copy_to_user(ptr, skb->data, len))
147 return -EFAULT;
149 total += len;
151 data->hdev->stat.byte_tx += len;
153 switch (bt_cb(skb)->pkt_type) {
154 case HCI_COMMAND_PKT:
155 data->hdev->stat.cmd_tx++;
156 break;
158 case HCI_ACLDATA_PKT:
159 data->hdev->stat.acl_tx++;
160 break;
162 case HCI_SCODATA_PKT:
163 data->hdev->stat.cmd_tx++;
164 break;
167 return total;
170 static ssize_t vhci_read(struct file *file,
171 char __user *buf, size_t count, loff_t *pos)
173 struct vhci_data *data = file->private_data;
174 struct sk_buff *skb;
175 ssize_t ret = 0;
177 while (count) {
178 skb = skb_dequeue(&data->readq);
179 if (skb) {
180 ret = vhci_put_user(data, skb, buf, count);
181 if (ret < 0)
182 skb_queue_head(&data->readq, skb);
183 else
184 kfree_skb(skb);
185 break;
188 if (file->f_flags & O_NONBLOCK) {
189 ret = -EAGAIN;
190 break;
193 ret = wait_event_interruptible(data->read_wait,
194 !skb_queue_empty(&data->readq));
195 if (ret < 0)
196 break;
199 return ret;
202 static ssize_t vhci_write(struct file *file,
203 const char __user *buf, size_t count, loff_t *pos)
205 struct vhci_data *data = file->private_data;
207 return vhci_get_user(data, buf, count);
210 static unsigned int vhci_poll(struct file *file, poll_table *wait)
212 struct vhci_data *data = file->private_data;
214 poll_wait(file, &data->read_wait, wait);
216 if (!skb_queue_empty(&data->readq))
217 return POLLIN | POLLRDNORM;
219 return POLLOUT | POLLWRNORM;
222 static int vhci_ioctl(struct inode *inode, struct file *file,
223 unsigned int cmd, unsigned long arg)
225 return -EINVAL;
228 static int vhci_open(struct inode *inode, struct file *file)
230 struct vhci_data *data;
231 struct hci_dev *hdev;
233 data = kzalloc(sizeof(struct vhci_data), GFP_KERNEL);
234 if (!data)
235 return -ENOMEM;
237 skb_queue_head_init(&data->readq);
238 init_waitqueue_head(&data->read_wait);
240 hdev = hci_alloc_dev();
241 if (!hdev) {
242 kfree(data);
243 return -ENOMEM;
246 data->hdev = hdev;
248 hdev->type = HCI_VIRTUAL;
249 hdev->driver_data = data;
251 hdev->open = vhci_open_dev;
252 hdev->close = vhci_close_dev;
253 hdev->flush = vhci_flush;
254 hdev->send = vhci_send_frame;
255 hdev->destruct = vhci_destruct;
257 hdev->owner = THIS_MODULE;
259 if (hci_register_dev(hdev) < 0) {
260 BT_ERR("Can't register HCI device");
261 kfree(data);
262 hci_free_dev(hdev);
263 return -EBUSY;
266 file->private_data = data;
268 return nonseekable_open(inode, file);
271 static int vhci_release(struct inode *inode, struct file *file)
273 struct vhci_data *data = file->private_data;
274 struct hci_dev *hdev = data->hdev;
276 if (hci_unregister_dev(hdev) < 0) {
277 BT_ERR("Can't unregister HCI device %s", hdev->name);
280 hci_free_dev(hdev);
282 file->private_data = NULL;
284 return 0;
287 static const struct file_operations vhci_fops = {
288 .read = vhci_read,
289 .write = vhci_write,
290 .poll = vhci_poll,
291 .ioctl = vhci_ioctl,
292 .open = vhci_open,
293 .release = vhci_release,
296 static struct miscdevice vhci_miscdev= {
297 .name = "vhci",
298 .fops = &vhci_fops,
299 .minor = MISC_DYNAMIC_MINOR,
302 static int __init vhci_init(void)
304 BT_INFO("Virtual HCI driver ver %s", VERSION);
306 if (misc_register(&vhci_miscdev) < 0) {
307 BT_ERR("Can't register misc device with minor %d", minor);
308 return -EIO;
311 return 0;
314 static void __exit vhci_exit(void)
316 if (misc_deregister(&vhci_miscdev) < 0)
317 BT_ERR("Can't unregister misc device with minor %d", minor);
320 module_init(vhci_init);
321 module_exit(vhci_exit);
323 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
324 MODULE_DESCRIPTION("Bluetooth virtual HCI driver ver " VERSION);
325 MODULE_VERSION(VERSION);
326 MODULE_LICENSE("GPL");