USB: usb-storage: unusual_devs update for Super TOP SATA bridge
[linux/fpc-iii.git] / drivers / bluetooth / hci_vhci.c
blob158bfe507da7fb19f4149ce63806bd9e8c510409
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/types.h>
32 #include <linux/errno.h>
33 #include <linux/sched.h>
34 #include <linux/poll.h>
36 #include <linux/skbuff.h>
37 #include <linux/miscdevice.h>
39 #include <net/bluetooth/bluetooth.h>
40 #include <net/bluetooth/hci_core.h>
42 #define VERSION "1.3"
44 static bool amp;
46 struct vhci_data {
47 struct hci_dev *hdev;
49 unsigned long flags;
51 wait_queue_head_t read_wait;
52 struct sk_buff_head readq;
55 static int vhci_open_dev(struct hci_dev *hdev)
57 set_bit(HCI_RUNNING, &hdev->flags);
59 return 0;
62 static int vhci_close_dev(struct hci_dev *hdev)
64 struct vhci_data *data = hci_get_drvdata(hdev);
66 if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
67 return 0;
69 skb_queue_purge(&data->readq);
71 return 0;
74 static int vhci_flush(struct hci_dev *hdev)
76 struct vhci_data *data = hci_get_drvdata(hdev);
78 skb_queue_purge(&data->readq);
80 return 0;
83 static int vhci_send_frame(struct sk_buff *skb)
85 struct hci_dev* hdev = (struct hci_dev *) skb->dev;
86 struct vhci_data *data;
88 if (!hdev) {
89 BT_ERR("Frame for unknown HCI device (hdev=NULL)");
90 return -ENODEV;
93 if (!test_bit(HCI_RUNNING, &hdev->flags))
94 return -EBUSY;
96 data = hci_get_drvdata(hdev);
98 memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
99 skb_queue_tail(&data->readq, skb);
101 wake_up_interruptible(&data->read_wait);
103 return 0;
106 static inline ssize_t vhci_get_user(struct vhci_data *data,
107 const char __user *buf, size_t count)
109 struct sk_buff *skb;
111 if (count > HCI_MAX_FRAME_SIZE)
112 return -EINVAL;
114 skb = bt_skb_alloc(count, GFP_KERNEL);
115 if (!skb)
116 return -ENOMEM;
118 if (copy_from_user(skb_put(skb, count), buf, count)) {
119 kfree_skb(skb);
120 return -EFAULT;
123 skb->dev = (void *) data->hdev;
124 bt_cb(skb)->pkt_type = *((__u8 *) skb->data);
125 skb_pull(skb, 1);
127 hci_recv_frame(skb);
129 return count;
132 static inline ssize_t vhci_put_user(struct vhci_data *data,
133 struct sk_buff *skb, char __user *buf, int count)
135 char __user *ptr = buf;
136 int len, total = 0;
138 len = min_t(unsigned int, skb->len, count);
140 if (copy_to_user(ptr, skb->data, len))
141 return -EFAULT;
143 total += len;
145 data->hdev->stat.byte_tx += len;
147 switch (bt_cb(skb)->pkt_type) {
148 case HCI_COMMAND_PKT:
149 data->hdev->stat.cmd_tx++;
150 break;
152 case HCI_ACLDATA_PKT:
153 data->hdev->stat.acl_tx++;
154 break;
156 case HCI_SCODATA_PKT:
157 data->hdev->stat.sco_tx++;
158 break;
161 return total;
164 static ssize_t vhci_read(struct file *file,
165 char __user *buf, size_t count, loff_t *pos)
167 struct vhci_data *data = file->private_data;
168 struct sk_buff *skb;
169 ssize_t ret = 0;
171 while (count) {
172 skb = skb_dequeue(&data->readq);
173 if (skb) {
174 ret = vhci_put_user(data, skb, buf, count);
175 if (ret < 0)
176 skb_queue_head(&data->readq, skb);
177 else
178 kfree_skb(skb);
179 break;
182 if (file->f_flags & O_NONBLOCK) {
183 ret = -EAGAIN;
184 break;
187 ret = wait_event_interruptible(data->read_wait,
188 !skb_queue_empty(&data->readq));
189 if (ret < 0)
190 break;
193 return ret;
196 static ssize_t vhci_write(struct file *file,
197 const char __user *buf, size_t count, loff_t *pos)
199 struct vhci_data *data = file->private_data;
201 return vhci_get_user(data, buf, count);
204 static unsigned int vhci_poll(struct file *file, poll_table *wait)
206 struct vhci_data *data = file->private_data;
208 poll_wait(file, &data->read_wait, wait);
210 if (!skb_queue_empty(&data->readq))
211 return POLLIN | POLLRDNORM;
213 return POLLOUT | POLLWRNORM;
216 static int vhci_open(struct inode *inode, struct file *file)
218 struct vhci_data *data;
219 struct hci_dev *hdev;
221 data = kzalloc(sizeof(struct vhci_data), GFP_KERNEL);
222 if (!data)
223 return -ENOMEM;
225 skb_queue_head_init(&data->readq);
226 init_waitqueue_head(&data->read_wait);
228 hdev = hci_alloc_dev();
229 if (!hdev) {
230 kfree(data);
231 return -ENOMEM;
234 data->hdev = hdev;
236 hdev->bus = HCI_VIRTUAL;
237 hci_set_drvdata(hdev, data);
239 if (amp)
240 hdev->dev_type = HCI_AMP;
242 hdev->open = vhci_open_dev;
243 hdev->close = vhci_close_dev;
244 hdev->flush = vhci_flush;
245 hdev->send = vhci_send_frame;
247 if (hci_register_dev(hdev) < 0) {
248 BT_ERR("Can't register HCI device");
249 kfree(data);
250 hci_free_dev(hdev);
251 return -EBUSY;
254 file->private_data = data;
256 return nonseekable_open(inode, file);
259 static int vhci_release(struct inode *inode, struct file *file)
261 struct vhci_data *data = file->private_data;
262 struct hci_dev *hdev = data->hdev;
264 hci_unregister_dev(hdev);
265 hci_free_dev(hdev);
267 file->private_data = NULL;
268 kfree(data);
270 return 0;
273 static const struct file_operations vhci_fops = {
274 .owner = THIS_MODULE,
275 .read = vhci_read,
276 .write = vhci_write,
277 .poll = vhci_poll,
278 .open = vhci_open,
279 .release = vhci_release,
280 .llseek = no_llseek,
283 static struct miscdevice vhci_miscdev= {
284 .name = "vhci",
285 .fops = &vhci_fops,
286 .minor = MISC_DYNAMIC_MINOR,
289 static int __init vhci_init(void)
291 BT_INFO("Virtual HCI driver ver %s", VERSION);
293 return misc_register(&vhci_miscdev);
296 static void __exit vhci_exit(void)
298 misc_deregister(&vhci_miscdev);
301 module_init(vhci_init);
302 module_exit(vhci_exit);
304 module_param(amp, bool, 0644);
305 MODULE_PARM_DESC(amp, "Create AMP controller device");
307 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
308 MODULE_DESCRIPTION("Bluetooth virtual HCI driver ver " VERSION);
309 MODULE_VERSION(VERSION);
310 MODULE_LICENSE("GPL");