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Merge branch 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[karo-tx-linux.git] / drivers / bluetooth / hci_vhci.c
1 /*
2  *
3  *  Bluetooth virtual HCI driver
4  *
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>
8  *
9  *
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.
14  *
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.
19  *
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
23  *
24  */
25
26 #include <linux/module.h>
27
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>
35
36 #include <linux/skbuff.h>
37 #include <linux/miscdevice.h>
38
39 #include <net/bluetooth/bluetooth.h>
40 #include <net/bluetooth/hci_core.h>
41
42 #define VERSION "1.3"
43
44 struct vhci_data {
45         struct hci_dev *hdev;
46
47         unsigned long flags;
48
49         wait_queue_head_t read_wait;
50         struct sk_buff_head readq;
51 };
52
53 static int vhci_open_dev(struct hci_dev *hdev)
54 {
55         set_bit(HCI_RUNNING, &hdev->flags);
56
57         return 0;
58 }
59
60 static int vhci_close_dev(struct hci_dev *hdev)
61 {
62         struct vhci_data *data = hdev->driver_data;
63
64         if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
65                 return 0;
66
67         skb_queue_purge(&data->readq);
68
69         return 0;
70 }
71
72 static int vhci_flush(struct hci_dev *hdev)
73 {
74         struct vhci_data *data = hdev->driver_data;
75
76         skb_queue_purge(&data->readq);
77
78         return 0;
79 }
80
81 static int vhci_send_frame(struct sk_buff *skb)
82 {
83         struct hci_dev* hdev = (struct hci_dev *) skb->dev;
84         struct vhci_data *data;
85
86         if (!hdev) {
87                 BT_ERR("Frame for unknown HCI device (hdev=NULL)");
88                 return -ENODEV;
89         }
90
91         if (!test_bit(HCI_RUNNING, &hdev->flags))
92                 return -EBUSY;
93
94         data = hdev->driver_data;
95
96         memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
97         skb_queue_tail(&data->readq, skb);
98
99         wake_up_interruptible(&data->read_wait);
100
101         return 0;
102 }
103
104 static void vhci_destruct(struct hci_dev *hdev)
105 {
106         kfree(hdev->driver_data);
107 }
108
109 static inline ssize_t vhci_get_user(struct vhci_data *data,
110                                         const char __user *buf, size_t count)
111 {
112         struct sk_buff *skb;
113
114         if (count > HCI_MAX_FRAME_SIZE)
115                 return -EINVAL;
116
117         skb = bt_skb_alloc(count, GFP_KERNEL);
118         if (!skb)
119                 return -ENOMEM;
120
121         if (copy_from_user(skb_put(skb, count), buf, count)) {
122                 kfree_skb(skb);
123                 return -EFAULT;
124         }
125
126         skb->dev = (void *) data->hdev;
127         bt_cb(skb)->pkt_type = *((__u8 *) skb->data);
128         skb_pull(skb, 1);
129
130         hci_recv_frame(skb);
131
132         return count;
133 }
134
135 static inline ssize_t vhci_put_user(struct vhci_data *data,
136                         struct sk_buff *skb, char __user *buf, int count)
137 {
138         char __user *ptr = buf;
139         int len, total = 0;
140
141         len = min_t(unsigned int, skb->len, count);
142
143         if (copy_to_user(ptr, skb->data, len))
144                 return -EFAULT;
145
146         total += len;
147
148         data->hdev->stat.byte_tx += len;
149
150         switch (bt_cb(skb)->pkt_type) {
151         case HCI_COMMAND_PKT:
152                 data->hdev->stat.cmd_tx++;
153                 break;
154
155         case HCI_ACLDATA_PKT:
156                 data->hdev->stat.acl_tx++;
157                 break;
158
159         case HCI_SCODATA_PKT:
160                 data->hdev->stat.cmd_tx++;
161                 break;
162         };
163
164         return total;
165 }
166
167 static ssize_t vhci_read(struct file *file,
168                                 char __user *buf, size_t count, loff_t *pos)
169 {
170         struct vhci_data *data = file->private_data;
171         struct sk_buff *skb;
172         ssize_t ret = 0;
173
174         while (count) {
175                 skb = skb_dequeue(&data->readq);
176                 if (skb) {
177                         ret = vhci_put_user(data, skb, buf, count);
178                         if (ret < 0)
179                                 skb_queue_head(&data->readq, skb);
180                         else
181                                 kfree_skb(skb);
182                         break;
183                 }
184
185                 if (file->f_flags & O_NONBLOCK) {
186                         ret = -EAGAIN;
187                         break;
188                 }
189
190                 ret = wait_event_interruptible(data->read_wait,
191                                         !skb_queue_empty(&data->readq));
192                 if (ret < 0)
193                         break;
194         }
195
196         return ret;
197 }
198
199 static ssize_t vhci_write(struct file *file,
200                         const char __user *buf, size_t count, loff_t *pos)
201 {
202         struct vhci_data *data = file->private_data;
203
204         return vhci_get_user(data, buf, count);
205 }
206
207 static unsigned int vhci_poll(struct file *file, poll_table *wait)
208 {
209         struct vhci_data *data = file->private_data;
210
211         poll_wait(file, &data->read_wait, wait);
212
213         if (!skb_queue_empty(&data->readq))
214                 return POLLIN | POLLRDNORM;
215
216         return POLLOUT | POLLWRNORM;
217 }
218
219 static int vhci_open(struct inode *inode, struct file *file)
220 {
221         struct vhci_data *data;
222         struct hci_dev *hdev;
223
224         data = kzalloc(sizeof(struct vhci_data), GFP_KERNEL);
225         if (!data)
226                 return -ENOMEM;
227
228         skb_queue_head_init(&data->readq);
229         init_waitqueue_head(&data->read_wait);
230
231         hdev = hci_alloc_dev();
232         if (!hdev) {
233                 kfree(data);
234                 return -ENOMEM;
235         }
236
237         data->hdev = hdev;
238
239         hdev->bus = HCI_VIRTUAL;
240         hdev->driver_data = data;
241
242         hdev->open     = vhci_open_dev;
243         hdev->close    = vhci_close_dev;
244         hdev->flush    = vhci_flush;
245         hdev->send     = vhci_send_frame;
246         hdev->destruct = vhci_destruct;
247
248         hdev->owner = THIS_MODULE;
249
250         if (hci_register_dev(hdev) < 0) {
251                 BT_ERR("Can't register HCI device");
252                 kfree(data);
253                 hci_free_dev(hdev);
254                 return -EBUSY;
255         }
256
257         file->private_data = data;
258
259         return nonseekable_open(inode, file);
260 }
261
262 static int vhci_release(struct inode *inode, struct file *file)
263 {
264         struct vhci_data *data = file->private_data;
265         struct hci_dev *hdev = data->hdev;
266
267         if (hci_unregister_dev(hdev) < 0) {
268                 BT_ERR("Can't unregister HCI device %s", hdev->name);
269         }
270
271         hci_free_dev(hdev);
272
273         file->private_data = NULL;
274
275         return 0;
276 }
277
278 static const struct file_operations vhci_fops = {
279         .owner          = THIS_MODULE,
280         .read           = vhci_read,
281         .write          = vhci_write,
282         .poll           = vhci_poll,
283         .open           = vhci_open,
284         .release        = vhci_release,
285 };
286
287 static struct miscdevice vhci_miscdev= {
288         .name   = "vhci",
289         .fops   = &vhci_fops,
290         .minor  = MISC_DYNAMIC_MINOR,
291 };
292
293 static int __init vhci_init(void)
294 {
295         BT_INFO("Virtual HCI driver ver %s", VERSION);
296
297         return misc_register(&vhci_miscdev);
298 }
299
300 static void __exit vhci_exit(void)
301 {
302         misc_deregister(&vhci_miscdev);
303 }
304
305 module_init(vhci_init);
306 module_exit(vhci_exit);
307
308 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
309 MODULE_DESCRIPTION("Bluetooth virtual HCI driver ver " VERSION);
310 MODULE_VERSION(VERSION);
311 MODULE_LICENSE("GPL");