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Commit | Line | Data |
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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> |
4aa769b9 MH |
31 | #include <linux/types.h> |
32 | #include <linux/errno.h> | |
33 | #include <linux/sched.h> | |
1da177e4 | 34 | #include <linux/poll.h> |
1da177e4 LT |
35 | |
36 | #include <linux/skbuff.h> | |
37 | #include <linux/miscdevice.h> | |
38 | ||
1da177e4 LT |
39 | #include <net/bluetooth/bluetooth.h> |
40 | #include <net/bluetooth/hci_core.h> | |
1da177e4 | 41 | |
ac28494c | 42 | #define VERSION "1.3" |
4aa769b9 | 43 | |
4aa769b9 MH |
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; | |
4aa769b9 MH |
51 | }; |
52 | ||
4aa769b9 | 53 | static int vhci_open_dev(struct hci_dev *hdev) |
1da177e4 LT |
54 | { |
55 | set_bit(HCI_RUNNING, &hdev->flags); | |
1da177e4 | 56 | |
1da177e4 LT |
57 | return 0; |
58 | } | |
59 | ||
4aa769b9 | 60 | static int vhci_close_dev(struct hci_dev *hdev) |
1da177e4 | 61 | { |
9c724357 | 62 | struct vhci_data *data = hdev->driver_data; |
4aa769b9 | 63 | |
1da177e4 LT |
64 | if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags)) |
65 | return 0; | |
66 | ||
9c724357 | 67 | skb_queue_purge(&data->readq); |
4aa769b9 | 68 | |
1da177e4 LT |
69 | return 0; |
70 | } | |
71 | ||
4aa769b9 | 72 | static int vhci_flush(struct hci_dev *hdev) |
1da177e4 | 73 | { |
9c724357 | 74 | struct vhci_data *data = hdev->driver_data; |
1da177e4 | 75 | |
9c724357 | 76 | skb_queue_purge(&data->readq); |
1da177e4 | 77 | |
4aa769b9 | 78 | return 0; |
1da177e4 LT |
79 | } |
80 | ||
4aa769b9 | 81 | static int vhci_send_frame(struct sk_buff *skb) |
1da177e4 LT |
82 | { |
83 | struct hci_dev* hdev = (struct hci_dev *) skb->dev; | |
9c724357 | 84 | struct vhci_data *data; |
1da177e4 LT |
85 | |
86 | if (!hdev) { | |
4aa769b9 | 87 | BT_ERR("Frame for unknown HCI device (hdev=NULL)"); |
1da177e4 LT |
88 | return -ENODEV; |
89 | } | |
90 | ||
91 | if (!test_bit(HCI_RUNNING, &hdev->flags)) | |
92 | return -EBUSY; | |
93 | ||
9c724357 | 94 | data = hdev->driver_data; |
1da177e4 | 95 | |
0d48d939 | 96 | memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1); |
9c724357 | 97 | skb_queue_tail(&data->readq, skb); |
4aa769b9 | 98 | |
9c724357 | 99 | wake_up_interruptible(&data->read_wait); |
1da177e4 LT |
100 | |
101 | return 0; | |
102 | } | |
103 | ||
4aa769b9 MH |
104 | static void vhci_destruct(struct hci_dev *hdev) |
105 | { | |
106 | kfree(hdev->driver_data); | |
1da177e4 LT |
107 | } |
108 | ||
9c724357 | 109 | static inline ssize_t vhci_get_user(struct vhci_data *data, |
4aa769b9 | 110 | const char __user *buf, size_t count) |
1da177e4 LT |
111 | { |
112 | struct sk_buff *skb; | |
113 | ||
114 | if (count > HCI_MAX_FRAME_SIZE) | |
115 | return -EINVAL; | |
116 | ||
4aa769b9 MH |
117 | skb = bt_skb_alloc(count, GFP_KERNEL); |
118 | if (!skb) | |
1da177e4 | 119 | return -ENOMEM; |
4aa769b9 | 120 | |
1da177e4 LT |
121 | if (copy_from_user(skb_put(skb, count), buf, count)) { |
122 | kfree_skb(skb); | |
123 | return -EFAULT; | |
124 | } | |
125 | ||
9c724357 | 126 | skb->dev = (void *) data->hdev; |
0d48d939 | 127 | bt_cb(skb)->pkt_type = *((__u8 *) skb->data); |
1da177e4 LT |
128 | skb_pull(skb, 1); |
129 | ||
130 | hci_recv_frame(skb); | |
131 | ||
132 | return count; | |
1da177e4 LT |
133 | } |
134 | ||
9c724357 | 135 | static inline ssize_t vhci_put_user(struct vhci_data *data, |
4aa769b9 | 136 | struct sk_buff *skb, char __user *buf, int count) |
1da177e4 | 137 | { |
1da177e4 | 138 | char __user *ptr = buf; |
4aa769b9 MH |
139 | int len, total = 0; |
140 | ||
141 | len = min_t(unsigned int, skb->len, count); | |
1da177e4 | 142 | |
1da177e4 LT |
143 | if (copy_to_user(ptr, skb->data, len)) |
144 | return -EFAULT; | |
4aa769b9 | 145 | |
1da177e4 LT |
146 | total += len; |
147 | ||
9c724357 | 148 | data->hdev->stat.byte_tx += len; |
4aa769b9 | 149 | |
0d48d939 MH |
150 | switch (bt_cb(skb)->pkt_type) { |
151 | case HCI_COMMAND_PKT: | |
9c724357 | 152 | data->hdev->stat.cmd_tx++; |
0d48d939 | 153 | break; |
1da177e4 | 154 | |
0d48d939 | 155 | case HCI_ACLDATA_PKT: |
9c724357 | 156 | data->hdev->stat.acl_tx++; |
0d48d939 | 157 | break; |
1da177e4 | 158 | |
0d48d939 | 159 | case HCI_SCODATA_PKT: |
9c724357 | 160 | data->hdev->stat.cmd_tx++; |
0d48d939 | 161 | break; |
1da177e4 LT |
162 | }; |
163 | ||
164 | return total; | |
165 | } | |
166 | ||
9c724357 MH |
167 | static ssize_t vhci_read(struct file *file, |
168 | char __user *buf, size_t count, loff_t *pos) | |
1da177e4 | 169 | { |
9c724357 | 170 | struct vhci_data *data = file->private_data; |
1da177e4 LT |
171 | struct sk_buff *skb; |
172 | ssize_t ret = 0; | |
173 | ||
1da177e4 | 174 | while (count) { |
9c724357 | 175 | skb = skb_dequeue(&data->readq); |
4db7589f MH |
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; | |
1da177e4 LT |
183 | } |
184 | ||
4db7589f MH |
185 | if (file->f_flags & O_NONBLOCK) { |
186 | ret = -EAGAIN; | |
187 | break; | |
188 | } | |
1da177e4 | 189 | |
4db7589f MH |
190 | ret = wait_event_interruptible(data->read_wait, |
191 | !skb_queue_empty(&data->readq)); | |
192 | if (ret < 0) | |
193 | break; | |
1da177e4 | 194 | } |
1da177e4 LT |
195 | |
196 | return ret; | |
197 | } | |
198 | ||
4aa769b9 MH |
199 | static ssize_t vhci_write(struct file *file, |
200 | const char __user *buf, size_t count, loff_t *pos) | |
1da177e4 | 201 | { |
9c724357 | 202 | struct vhci_data *data = file->private_data; |
1da177e4 | 203 | |
9c724357 | 204 | return vhci_get_user(data, buf, count); |
1da177e4 LT |
205 | } |
206 | ||
4aa769b9 | 207 | static unsigned int vhci_poll(struct file *file, poll_table *wait) |
1da177e4 | 208 | { |
9c724357 | 209 | struct vhci_data *data = file->private_data; |
1da177e4 | 210 | |
9c724357 | 211 | poll_wait(file, &data->read_wait, wait); |
1da177e4 | 212 | |
9c724357 | 213 | if (!skb_queue_empty(&data->readq)) |
4aa769b9 MH |
214 | return POLLIN | POLLRDNORM; |
215 | ||
216 | return POLLOUT | POLLWRNORM; | |
217 | } | |
218 | ||
4aa769b9 | 219 | static int vhci_open(struct inode *inode, struct file *file) |
1da177e4 | 220 | { |
9c724357 | 221 | struct vhci_data *data; |
1da177e4 LT |
222 | struct hci_dev *hdev; |
223 | ||
9c724357 MH |
224 | data = kzalloc(sizeof(struct vhci_data), GFP_KERNEL); |
225 | if (!data) | |
1da177e4 LT |
226 | return -ENOMEM; |
227 | ||
9c724357 MH |
228 | skb_queue_head_init(&data->readq); |
229 | init_waitqueue_head(&data->read_wait); | |
1da177e4 | 230 | |
1da177e4 LT |
231 | hdev = hci_alloc_dev(); |
232 | if (!hdev) { | |
9c724357 | 233 | kfree(data); |
1da177e4 LT |
234 | return -ENOMEM; |
235 | } | |
236 | ||
9c724357 | 237 | data->hdev = hdev; |
1da177e4 | 238 | |
0ac53939 | 239 | hdev->type = HCI_VIRTUAL; |
9c724357 | 240 | hdev->driver_data = data; |
1da177e4 | 241 | |
4aa769b9 MH |
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; | |
1da177e4 LT |
247 | |
248 | hdev->owner = THIS_MODULE; | |
4aa769b9 | 249 | |
1da177e4 | 250 | if (hci_register_dev(hdev) < 0) { |
4aa769b9 | 251 | BT_ERR("Can't register HCI device"); |
9c724357 | 252 | kfree(data); |
1da177e4 LT |
253 | hci_free_dev(hdev); |
254 | return -EBUSY; | |
255 | } | |
256 | ||
9c724357 | 257 | file->private_data = data; |
4aa769b9 MH |
258 | |
259 | return nonseekable_open(inode, file); | |
1da177e4 LT |
260 | } |
261 | ||
4aa769b9 | 262 | static int vhci_release(struct inode *inode, struct file *file) |
1da177e4 | 263 | { |
9c724357 MH |
264 | struct vhci_data *data = file->private_data; |
265 | struct hci_dev *hdev = data->hdev; | |
1da177e4 LT |
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; | |
4aa769b9 MH |
274 | |
275 | return 0; | |
276 | } | |
277 | ||
2b8693c0 | 278 | static const struct file_operations vhci_fops = { |
4aa769b9 MH |
279 | .read = vhci_read, |
280 | .write = vhci_write, | |
281 | .poll = vhci_poll, | |
4aa769b9 MH |
282 | .open = vhci_open, |
283 | .release = vhci_release, | |
1da177e4 LT |
284 | }; |
285 | ||
4aa769b9 | 286 | static struct miscdevice vhci_miscdev= { |
ac28494c MH |
287 | .name = "vhci", |
288 | .fops = &vhci_fops, | |
289 | .minor = MISC_DYNAMIC_MINOR, | |
1da177e4 LT |
290 | }; |
291 | ||
4aa769b9 | 292 | static int __init vhci_init(void) |
1da177e4 | 293 | { |
4aa769b9 | 294 | BT_INFO("Virtual HCI driver ver %s", VERSION); |
1da177e4 | 295 | |
329ab1b3 | 296 | return misc_register(&vhci_miscdev); |
1da177e4 LT |
297 | } |
298 | ||
4aa769b9 | 299 | static void __exit vhci_exit(void) |
1da177e4 | 300 | { |
329ab1b3 | 301 | misc_deregister(&vhci_miscdev); |
1da177e4 LT |
302 | } |
303 | ||
4aa769b9 MH |
304 | module_init(vhci_init); |
305 | module_exit(vhci_exit); | |
306 | ||
63fbd24e | 307 | MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); |
4aa769b9 MH |
308 | MODULE_DESCRIPTION("Bluetooth virtual HCI driver ver " VERSION); |
309 | MODULE_VERSION(VERSION); | |
310 | MODULE_LICENSE("GPL"); |