Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 | 2 | * |
4aa769b9 MH |
3 | * Bluetooth virtual HCI driver |
4 | * | |
9c724357 MH |
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> | |
4aa769b9 MH |
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 | * | |
1da177e4 | 24 | */ |
1da177e4 | 25 | |
1da177e4 LT |
26 | #include <linux/module.h> |
27 | ||
1da177e4 | 28 | #include <linux/kernel.h> |
4aa769b9 | 29 | #include <linux/init.h> |
1da177e4 | 30 | #include <linux/slab.h> |
8324af6d | 31 | #include <linux/smp_lock.h> |
4aa769b9 MH |
32 | #include <linux/types.h> |
33 | #include <linux/errno.h> | |
34 | #include <linux/sched.h> | |
1da177e4 | 35 | #include <linux/poll.h> |
1da177e4 LT |
36 | |
37 | #include <linux/skbuff.h> | |
38 | #include <linux/miscdevice.h> | |
39 | ||
1da177e4 LT |
40 | #include <net/bluetooth/bluetooth.h> |
41 | #include <net/bluetooth/hci_core.h> | |
1da177e4 | 42 | |
ac28494c | 43 | #define VERSION "1.3" |
4aa769b9 MH |
44 | |
45 | static int minor = MISC_DYNAMIC_MINOR; | |
1da177e4 | 46 | |
4aa769b9 MH |
47 | struct vhci_data { |
48 | struct hci_dev *hdev; | |
49 | ||
50 | unsigned long flags; | |
51 | ||
52 | wait_queue_head_t read_wait; | |
53 | struct sk_buff_head readq; | |
4aa769b9 MH |
54 | }; |
55 | ||
4aa769b9 | 56 | static int vhci_open_dev(struct hci_dev *hdev) |
1da177e4 LT |
57 | { |
58 | set_bit(HCI_RUNNING, &hdev->flags); | |
1da177e4 | 59 | |
1da177e4 LT |
60 | return 0; |
61 | } | |
62 | ||
4aa769b9 | 63 | static int vhci_close_dev(struct hci_dev *hdev) |
1da177e4 | 64 | { |
9c724357 | 65 | struct vhci_data *data = hdev->driver_data; |
4aa769b9 | 66 | |
1da177e4 LT |
67 | if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags)) |
68 | return 0; | |
69 | ||
9c724357 | 70 | skb_queue_purge(&data->readq); |
4aa769b9 | 71 | |
1da177e4 LT |
72 | return 0; |
73 | } | |
74 | ||
4aa769b9 | 75 | static int vhci_flush(struct hci_dev *hdev) |
1da177e4 | 76 | { |
9c724357 | 77 | struct vhci_data *data = hdev->driver_data; |
1da177e4 | 78 | |
9c724357 | 79 | skb_queue_purge(&data->readq); |
1da177e4 | 80 | |
4aa769b9 | 81 | return 0; |
1da177e4 LT |
82 | } |
83 | ||
4aa769b9 | 84 | static int vhci_send_frame(struct sk_buff *skb) |
1da177e4 LT |
85 | { |
86 | struct hci_dev* hdev = (struct hci_dev *) skb->dev; | |
9c724357 | 87 | struct vhci_data *data; |
1da177e4 LT |
88 | |
89 | if (!hdev) { | |
4aa769b9 | 90 | BT_ERR("Frame for unknown HCI device (hdev=NULL)"); |
1da177e4 LT |
91 | return -ENODEV; |
92 | } | |
93 | ||
94 | if (!test_bit(HCI_RUNNING, &hdev->flags)) | |
95 | return -EBUSY; | |
96 | ||
9c724357 | 97 | data = hdev->driver_data; |
1da177e4 | 98 | |
0d48d939 | 99 | memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1); |
9c724357 | 100 | skb_queue_tail(&data->readq, skb); |
4aa769b9 | 101 | |
9c724357 | 102 | wake_up_interruptible(&data->read_wait); |
1da177e4 LT |
103 | |
104 | return 0; | |
105 | } | |
106 | ||
4aa769b9 MH |
107 | static void vhci_destruct(struct hci_dev *hdev) |
108 | { | |
109 | kfree(hdev->driver_data); | |
1da177e4 LT |
110 | } |
111 | ||
9c724357 | 112 | static inline ssize_t vhci_get_user(struct vhci_data *data, |
4aa769b9 | 113 | const char __user *buf, size_t count) |
1da177e4 LT |
114 | { |
115 | struct sk_buff *skb; | |
116 | ||
117 | if (count > HCI_MAX_FRAME_SIZE) | |
118 | return -EINVAL; | |
119 | ||
4aa769b9 MH |
120 | skb = bt_skb_alloc(count, GFP_KERNEL); |
121 | if (!skb) | |
1da177e4 | 122 | return -ENOMEM; |
4aa769b9 | 123 | |
1da177e4 LT |
124 | if (copy_from_user(skb_put(skb, count), buf, count)) { |
125 | kfree_skb(skb); | |
126 | return -EFAULT; | |
127 | } | |
128 | ||
9c724357 | 129 | skb->dev = (void *) data->hdev; |
0d48d939 | 130 | bt_cb(skb)->pkt_type = *((__u8 *) skb->data); |
1da177e4 LT |
131 | skb_pull(skb, 1); |
132 | ||
133 | hci_recv_frame(skb); | |
134 | ||
135 | return count; | |
1da177e4 LT |
136 | } |
137 | ||
9c724357 | 138 | static inline ssize_t vhci_put_user(struct vhci_data *data, |
4aa769b9 | 139 | struct sk_buff *skb, char __user *buf, int count) |
1da177e4 | 140 | { |
1da177e4 | 141 | char __user *ptr = buf; |
4aa769b9 MH |
142 | int len, total = 0; |
143 | ||
144 | len = min_t(unsigned int, skb->len, count); | |
1da177e4 | 145 | |
1da177e4 LT |
146 | if (copy_to_user(ptr, skb->data, len)) |
147 | return -EFAULT; | |
4aa769b9 | 148 | |
1da177e4 LT |
149 | total += len; |
150 | ||
9c724357 | 151 | data->hdev->stat.byte_tx += len; |
4aa769b9 | 152 | |
0d48d939 MH |
153 | switch (bt_cb(skb)->pkt_type) { |
154 | case HCI_COMMAND_PKT: | |
9c724357 | 155 | data->hdev->stat.cmd_tx++; |
0d48d939 | 156 | break; |
1da177e4 | 157 | |
0d48d939 | 158 | case HCI_ACLDATA_PKT: |
9c724357 | 159 | data->hdev->stat.acl_tx++; |
0d48d939 | 160 | break; |
1da177e4 | 161 | |
0d48d939 | 162 | case HCI_SCODATA_PKT: |
9c724357 | 163 | data->hdev->stat.cmd_tx++; |
0d48d939 | 164 | break; |
1da177e4 LT |
165 | }; |
166 | ||
167 | return total; | |
168 | } | |
169 | ||
9c724357 MH |
170 | static ssize_t vhci_read(struct file *file, |
171 | char __user *buf, size_t count, loff_t *pos) | |
1da177e4 | 172 | { |
9c724357 | 173 | struct vhci_data *data = file->private_data; |
1da177e4 LT |
174 | struct sk_buff *skb; |
175 | ssize_t ret = 0; | |
176 | ||
1da177e4 | 177 | while (count) { |
9c724357 | 178 | skb = skb_dequeue(&data->readq); |
4db7589f MH |
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; | |
1da177e4 LT |
186 | } |
187 | ||
4db7589f MH |
188 | if (file->f_flags & O_NONBLOCK) { |
189 | ret = -EAGAIN; | |
190 | break; | |
191 | } | |
1da177e4 | 192 | |
4db7589f MH |
193 | ret = wait_event_interruptible(data->read_wait, |
194 | !skb_queue_empty(&data->readq)); | |
195 | if (ret < 0) | |
196 | break; | |
1da177e4 | 197 | } |
1da177e4 LT |
198 | |
199 | return ret; | |
200 | } | |
201 | ||
4aa769b9 MH |
202 | static ssize_t vhci_write(struct file *file, |
203 | const char __user *buf, size_t count, loff_t *pos) | |
1da177e4 | 204 | { |
9c724357 | 205 | struct vhci_data *data = file->private_data; |
1da177e4 | 206 | |
9c724357 | 207 | return vhci_get_user(data, buf, count); |
1da177e4 LT |
208 | } |
209 | ||
4aa769b9 | 210 | static unsigned int vhci_poll(struct file *file, poll_table *wait) |
1da177e4 | 211 | { |
9c724357 | 212 | struct vhci_data *data = file->private_data; |
1da177e4 | 213 | |
9c724357 | 214 | poll_wait(file, &data->read_wait, wait); |
1da177e4 | 215 | |
9c724357 | 216 | if (!skb_queue_empty(&data->readq)) |
4aa769b9 MH |
217 | return POLLIN | POLLRDNORM; |
218 | ||
219 | return POLLOUT | POLLWRNORM; | |
220 | } | |
221 | ||
222 | static int vhci_ioctl(struct inode *inode, struct file *file, | |
223 | unsigned int cmd, unsigned long arg) | |
224 | { | |
225 | return -EINVAL; | |
1da177e4 LT |
226 | } |
227 | ||
4aa769b9 | 228 | static int vhci_open(struct inode *inode, struct file *file) |
1da177e4 | 229 | { |
9c724357 | 230 | struct vhci_data *data; |
1da177e4 LT |
231 | struct hci_dev *hdev; |
232 | ||
9c724357 MH |
233 | data = kzalloc(sizeof(struct vhci_data), GFP_KERNEL); |
234 | if (!data) | |
1da177e4 LT |
235 | return -ENOMEM; |
236 | ||
9c724357 MH |
237 | skb_queue_head_init(&data->readq); |
238 | init_waitqueue_head(&data->read_wait); | |
1da177e4 | 239 | |
1da177e4 LT |
240 | hdev = hci_alloc_dev(); |
241 | if (!hdev) { | |
9c724357 | 242 | kfree(data); |
1da177e4 LT |
243 | return -ENOMEM; |
244 | } | |
245 | ||
9c724357 | 246 | data->hdev = hdev; |
1da177e4 | 247 | |
0ac53939 | 248 | hdev->type = HCI_VIRTUAL; |
9c724357 | 249 | hdev->driver_data = data; |
1da177e4 | 250 | |
4aa769b9 MH |
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; | |
1da177e4 LT |
256 | |
257 | hdev->owner = THIS_MODULE; | |
4aa769b9 | 258 | |
1da177e4 | 259 | if (hci_register_dev(hdev) < 0) { |
4aa769b9 | 260 | BT_ERR("Can't register HCI device"); |
9c724357 | 261 | kfree(data); |
1da177e4 LT |
262 | hci_free_dev(hdev); |
263 | return -EBUSY; | |
264 | } | |
265 | ||
9c724357 | 266 | file->private_data = data; |
4aa769b9 MH |
267 | |
268 | return nonseekable_open(inode, file); | |
1da177e4 LT |
269 | } |
270 | ||
4aa769b9 | 271 | static int vhci_release(struct inode *inode, struct file *file) |
1da177e4 | 272 | { |
9c724357 MH |
273 | struct vhci_data *data = file->private_data; |
274 | struct hci_dev *hdev = data->hdev; | |
1da177e4 LT |
275 | |
276 | if (hci_unregister_dev(hdev) < 0) { | |
277 | BT_ERR("Can't unregister HCI device %s", hdev->name); | |
278 | } | |
279 | ||
280 | hci_free_dev(hdev); | |
281 | ||
282 | file->private_data = NULL; | |
4aa769b9 MH |
283 | |
284 | return 0; | |
285 | } | |
286 | ||
2b8693c0 | 287 | static const struct file_operations vhci_fops = { |
4aa769b9 MH |
288 | .read = vhci_read, |
289 | .write = vhci_write, | |
290 | .poll = vhci_poll, | |
291 | .ioctl = vhci_ioctl, | |
292 | .open = vhci_open, | |
293 | .release = vhci_release, | |
1da177e4 LT |
294 | }; |
295 | ||
4aa769b9 | 296 | static struct miscdevice vhci_miscdev= { |
ac28494c MH |
297 | .name = "vhci", |
298 | .fops = &vhci_fops, | |
299 | .minor = MISC_DYNAMIC_MINOR, | |
1da177e4 LT |
300 | }; |
301 | ||
4aa769b9 | 302 | static int __init vhci_init(void) |
1da177e4 | 303 | { |
4aa769b9 | 304 | BT_INFO("Virtual HCI driver ver %s", VERSION); |
1da177e4 | 305 | |
4aa769b9 MH |
306 | if (misc_register(&vhci_miscdev) < 0) { |
307 | BT_ERR("Can't register misc device with minor %d", minor); | |
1da177e4 LT |
308 | return -EIO; |
309 | } | |
310 | ||
311 | return 0; | |
312 | } | |
313 | ||
4aa769b9 | 314 | static void __exit vhci_exit(void) |
1da177e4 | 315 | { |
4aa769b9 MH |
316 | if (misc_deregister(&vhci_miscdev) < 0) |
317 | BT_ERR("Can't unregister misc device with minor %d", minor); | |
1da177e4 LT |
318 | } |
319 | ||
4aa769b9 MH |
320 | module_init(vhci_init); |
321 | module_exit(vhci_exit); | |
322 | ||
63fbd24e | 323 | MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); |
4aa769b9 MH |
324 | MODULE_DESCRIPTION("Bluetooth virtual HCI driver ver " VERSION); |
325 | MODULE_VERSION(VERSION); | |
326 | MODULE_LICENSE("GPL"); |