[Bluetooth] Consolidate maintainers information
[linux-2.6.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/smp_lock.h>
32 #include <linux/types.h>
33 #include <linux/errno.h>
34 #include <linux/sched.h>
35 #include <linux/poll.h>
36
37 #include <linux/skbuff.h>
38 #include <linux/miscdevice.h>
39
40 #include <net/bluetooth/bluetooth.h>
41 #include <net/bluetooth/hci_core.h>
42
43 #ifndef CONFIG_BT_HCIVHCI_DEBUG
44 #undef  BT_DBG
45 #define BT_DBG(D...)
46 #endif
47
48 #define VERSION "1.2"
49
50 static int minor = MISC_DYNAMIC_MINOR;
51
52 struct vhci_data {
53         struct hci_dev *hdev;
54
55         unsigned long flags;
56
57         wait_queue_head_t read_wait;
58         struct sk_buff_head readq;
59
60         struct fasync_struct *fasync;
61 };
62
63 #define VHCI_FASYNC     0x0010
64
65 static struct miscdevice vhci_miscdev;
66
67 static int vhci_open_dev(struct hci_dev *hdev)
68 {
69         set_bit(HCI_RUNNING, &hdev->flags);
70
71         return 0;
72 }
73
74 static int vhci_close_dev(struct hci_dev *hdev)
75 {
76         struct vhci_data *data = hdev->driver_data;
77
78         if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
79                 return 0;
80
81         skb_queue_purge(&data->readq);
82
83         return 0;
84 }
85
86 static int vhci_flush(struct hci_dev *hdev)
87 {
88         struct vhci_data *data = hdev->driver_data;
89
90         skb_queue_purge(&data->readq);
91
92         return 0;
93 }
94
95 static int vhci_send_frame(struct sk_buff *skb)
96 {
97         struct hci_dev* hdev = (struct hci_dev *) skb->dev;
98         struct vhci_data *data;
99
100         if (!hdev) {
101                 BT_ERR("Frame for unknown HCI device (hdev=NULL)");
102                 return -ENODEV;
103         }
104
105         if (!test_bit(HCI_RUNNING, &hdev->flags))
106                 return -EBUSY;
107
108         data = hdev->driver_data;
109
110         memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
111         skb_queue_tail(&data->readq, skb);
112
113         if (data->flags & VHCI_FASYNC)
114                 kill_fasync(&data->fasync, SIGIO, POLL_IN);
115
116         wake_up_interruptible(&data->read_wait);
117
118         return 0;
119 }
120
121 static void vhci_destruct(struct hci_dev *hdev)
122 {
123         kfree(hdev->driver_data);
124 }
125
126 static inline ssize_t vhci_get_user(struct vhci_data *data,
127                                         const char __user *buf, size_t count)
128 {
129         struct sk_buff *skb;
130
131         if (count > HCI_MAX_FRAME_SIZE)
132                 return -EINVAL;
133
134         skb = bt_skb_alloc(count, GFP_KERNEL);
135         if (!skb)
136                 return -ENOMEM;
137
138         if (copy_from_user(skb_put(skb, count), buf, count)) {
139                 kfree_skb(skb);
140                 return -EFAULT;
141         }
142
143         skb->dev = (void *) data->hdev;
144         bt_cb(skb)->pkt_type = *((__u8 *) skb->data);
145         skb_pull(skb, 1);
146
147         hci_recv_frame(skb);
148
149         return count;
150 }
151
152 static inline ssize_t vhci_put_user(struct vhci_data *data,
153                         struct sk_buff *skb, char __user *buf, int count)
154 {
155         char __user *ptr = buf;
156         int len, total = 0;
157
158         len = min_t(unsigned int, skb->len, count);
159
160         if (copy_to_user(ptr, skb->data, len))
161                 return -EFAULT;
162
163         total += len;
164
165         data->hdev->stat.byte_tx += len;
166
167         switch (bt_cb(skb)->pkt_type) {
168         case HCI_COMMAND_PKT:
169                 data->hdev->stat.cmd_tx++;
170                 break;
171
172         case HCI_ACLDATA_PKT:
173                 data->hdev->stat.acl_tx++;
174                 break;
175
176         case HCI_SCODATA_PKT:
177                 data->hdev->stat.cmd_tx++;
178                 break;
179         };
180
181         return total;
182 }
183
184 static ssize_t vhci_read(struct file *file,
185                                 char __user *buf, size_t count, loff_t *pos)
186 {
187         DECLARE_WAITQUEUE(wait, current);
188         struct vhci_data *data = file->private_data;
189         struct sk_buff *skb;
190         ssize_t ret = 0;
191
192         add_wait_queue(&data->read_wait, &wait);
193         while (count) {
194                 set_current_state(TASK_INTERRUPTIBLE);
195
196                 skb = skb_dequeue(&data->readq);
197                 if (!skb) {
198                         if (file->f_flags & O_NONBLOCK) {
199                                 ret = -EAGAIN;
200                                 break;
201                         }
202
203                         if (signal_pending(current)) {
204                                 ret = -ERESTARTSYS;
205                                 break;
206                         }
207
208                         schedule();
209                         continue;
210                 }
211
212                 if (access_ok(VERIFY_WRITE, buf, count))
213                         ret = vhci_put_user(data, skb, buf, count);
214                 else
215                         ret = -EFAULT;
216
217                 kfree_skb(skb);
218                 break;
219         }
220         set_current_state(TASK_RUNNING);
221         remove_wait_queue(&data->read_wait, &wait);
222
223         return ret;
224 }
225
226 static ssize_t vhci_write(struct file *file,
227                         const char __user *buf, size_t count, loff_t *pos)
228 {
229         struct vhci_data *data = file->private_data;
230
231         if (!access_ok(VERIFY_READ, buf, count))
232                 return -EFAULT;
233
234         return vhci_get_user(data, buf, count);
235 }
236
237 static unsigned int vhci_poll(struct file *file, poll_table *wait)
238 {
239         struct vhci_data *data = file->private_data;
240
241         poll_wait(file, &data->read_wait, wait);
242
243         if (!skb_queue_empty(&data->readq))
244                 return POLLIN | POLLRDNORM;
245
246         return POLLOUT | POLLWRNORM;
247 }
248
249 static int vhci_ioctl(struct inode *inode, struct file *file,
250                                         unsigned int cmd, unsigned long arg)
251 {
252         return -EINVAL;
253 }
254
255 static int vhci_open(struct inode *inode, struct file *file)
256 {
257         struct vhci_data *data;
258         struct hci_dev *hdev;
259
260         data = kzalloc(sizeof(struct vhci_data), GFP_KERNEL);
261         if (!data)
262                 return -ENOMEM;
263
264         skb_queue_head_init(&data->readq);
265         init_waitqueue_head(&data->read_wait);
266
267         lock_kernel();
268         hdev = hci_alloc_dev();
269         if (!hdev) {
270                 kfree(data);
271                 unlock_kernel();
272                 return -ENOMEM;
273         }
274
275         data->hdev = hdev;
276
277         hdev->type = HCI_VIRTUAL;
278         hdev->driver_data = data;
279
280         hdev->open     = vhci_open_dev;
281         hdev->close    = vhci_close_dev;
282         hdev->flush    = vhci_flush;
283         hdev->send     = vhci_send_frame;
284         hdev->destruct = vhci_destruct;
285
286         hdev->owner = THIS_MODULE;
287
288         if (hci_register_dev(hdev) < 0) {
289                 BT_ERR("Can't register HCI device");
290                 kfree(data);
291                 hci_free_dev(hdev);
292                 unlock_kernel();
293                 return -EBUSY;
294         }
295
296         file->private_data = data;
297         unlock_kernel();
298
299         return nonseekable_open(inode, file);
300 }
301
302 static int vhci_release(struct inode *inode, struct file *file)
303 {
304         struct vhci_data *data = file->private_data;
305         struct hci_dev *hdev = data->hdev;
306
307         if (hci_unregister_dev(hdev) < 0) {
308                 BT_ERR("Can't unregister HCI device %s", hdev->name);
309         }
310
311         hci_free_dev(hdev);
312
313         file->private_data = NULL;
314
315         return 0;
316 }
317
318 static int vhci_fasync(int fd, struct file *file, int on)
319 {
320         struct vhci_data *data = file->private_data;
321         int err = 0;
322
323         lock_kernel();
324         err = fasync_helper(fd, file, on, &data->fasync);
325         if (err < 0)
326                 goto out;
327
328         if (on)
329                 data->flags |= VHCI_FASYNC;
330         else
331                 data->flags &= ~VHCI_FASYNC;
332
333 out:
334         unlock_kernel();
335         return err;
336 }
337
338 static const struct file_operations vhci_fops = {
339         .owner          = THIS_MODULE,
340         .read           = vhci_read,
341         .write          = vhci_write,
342         .poll           = vhci_poll,
343         .ioctl          = vhci_ioctl,
344         .open           = vhci_open,
345         .release        = vhci_release,
346         .fasync         = vhci_fasync,
347 };
348
349 static struct miscdevice vhci_miscdev= {
350         .name           = "vhci",
351         .fops           = &vhci_fops,
352 };
353
354 static int __init vhci_init(void)
355 {
356         BT_INFO("Virtual HCI driver ver %s", VERSION);
357
358         vhci_miscdev.minor = minor;
359
360         if (misc_register(&vhci_miscdev) < 0) {
361                 BT_ERR("Can't register misc device with minor %d", minor);
362                 return -EIO;
363         }
364
365         return 0;
366 }
367
368 static void __exit vhci_exit(void)
369 {
370         if (misc_deregister(&vhci_miscdev) < 0)
371                 BT_ERR("Can't unregister misc device with minor %d", minor);
372 }
373
374 module_init(vhci_init);
375 module_exit(vhci_exit);
376
377 module_param(minor, int, 0444);
378 MODULE_PARM_DESC(minor, "Miscellaneous minor device number");
379
380 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
381 MODULE_DESCRIPTION("Bluetooth virtual HCI driver ver " VERSION);
382 MODULE_VERSION(VERSION);
383 MODULE_LICENSE("GPL");