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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 | |
36acbb1a AE |
44 | static bool amp; |
45 | ||
4aa769b9 MH |
46 | struct vhci_data { |
47 | struct hci_dev *hdev; | |
48 | ||
49 | unsigned long flags; | |
50 | ||
51 | wait_queue_head_t read_wait; | |
52 | struct sk_buff_head readq; | |
4aa769b9 MH |
53 | }; |
54 | ||
4aa769b9 | 55 | static int vhci_open_dev(struct hci_dev *hdev) |
1da177e4 LT |
56 | { |
57 | set_bit(HCI_RUNNING, &hdev->flags); | |
1da177e4 | 58 | |
1da177e4 LT |
59 | return 0; |
60 | } | |
61 | ||
4aa769b9 | 62 | static int vhci_close_dev(struct hci_dev *hdev) |
1da177e4 | 63 | { |
9c724357 | 64 | struct vhci_data *data = hdev->driver_data; |
4aa769b9 | 65 | |
1da177e4 LT |
66 | if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags)) |
67 | return 0; | |
68 | ||
9c724357 | 69 | skb_queue_purge(&data->readq); |
4aa769b9 | 70 | |
1da177e4 LT |
71 | return 0; |
72 | } | |
73 | ||
4aa769b9 | 74 | static int vhci_flush(struct hci_dev *hdev) |
1da177e4 | 75 | { |
9c724357 | 76 | struct vhci_data *data = hdev->driver_data; |
1da177e4 | 77 | |
9c724357 | 78 | skb_queue_purge(&data->readq); |
1da177e4 | 79 | |
4aa769b9 | 80 | return 0; |
1da177e4 LT |
81 | } |
82 | ||
4aa769b9 | 83 | static int vhci_send_frame(struct sk_buff *skb) |
1da177e4 LT |
84 | { |
85 | struct hci_dev* hdev = (struct hci_dev *) skb->dev; | |
9c724357 | 86 | struct vhci_data *data; |
1da177e4 LT |
87 | |
88 | if (!hdev) { | |
4aa769b9 | 89 | BT_ERR("Frame for unknown HCI device (hdev=NULL)"); |
1da177e4 LT |
90 | return -ENODEV; |
91 | } | |
92 | ||
93 | if (!test_bit(HCI_RUNNING, &hdev->flags)) | |
94 | return -EBUSY; | |
95 | ||
9c724357 | 96 | data = hdev->driver_data; |
1da177e4 | 97 | |
0d48d939 | 98 | memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1); |
9c724357 | 99 | skb_queue_tail(&data->readq, skb); |
4aa769b9 | 100 | |
9c724357 | 101 | wake_up_interruptible(&data->read_wait); |
1da177e4 LT |
102 | |
103 | return 0; | |
104 | } | |
105 | ||
4aa769b9 MH |
106 | static void vhci_destruct(struct hci_dev *hdev) |
107 | { | |
108 | kfree(hdev->driver_data); | |
1da177e4 LT |
109 | } |
110 | ||
9c724357 | 111 | static inline ssize_t vhci_get_user(struct vhci_data *data, |
4aa769b9 | 112 | const char __user *buf, size_t count) |
1da177e4 LT |
113 | { |
114 | struct sk_buff *skb; | |
115 | ||
116 | if (count > HCI_MAX_FRAME_SIZE) | |
117 | return -EINVAL; | |
118 | ||
4aa769b9 MH |
119 | skb = bt_skb_alloc(count, GFP_KERNEL); |
120 | if (!skb) | |
1da177e4 | 121 | return -ENOMEM; |
4aa769b9 | 122 | |
1da177e4 LT |
123 | if (copy_from_user(skb_put(skb, count), buf, count)) { |
124 | kfree_skb(skb); | |
125 | return -EFAULT; | |
126 | } | |
127 | ||
9c724357 | 128 | skb->dev = (void *) data->hdev; |
0d48d939 | 129 | bt_cb(skb)->pkt_type = *((__u8 *) skb->data); |
1da177e4 LT |
130 | skb_pull(skb, 1); |
131 | ||
132 | hci_recv_frame(skb); | |
133 | ||
134 | return count; | |
1da177e4 LT |
135 | } |
136 | ||
9c724357 | 137 | static inline ssize_t vhci_put_user(struct vhci_data *data, |
4aa769b9 | 138 | struct sk_buff *skb, char __user *buf, int count) |
1da177e4 | 139 | { |
1da177e4 | 140 | char __user *ptr = buf; |
4aa769b9 MH |
141 | int len, total = 0; |
142 | ||
143 | len = min_t(unsigned int, skb->len, count); | |
1da177e4 | 144 | |
1da177e4 LT |
145 | if (copy_to_user(ptr, skb->data, len)) |
146 | return -EFAULT; | |
4aa769b9 | 147 | |
1da177e4 LT |
148 | total += len; |
149 | ||
9c724357 | 150 | data->hdev->stat.byte_tx += len; |
4aa769b9 | 151 | |
0d48d939 MH |
152 | switch (bt_cb(skb)->pkt_type) { |
153 | case HCI_COMMAND_PKT: | |
9c724357 | 154 | data->hdev->stat.cmd_tx++; |
0d48d939 | 155 | break; |
1da177e4 | 156 | |
0d48d939 | 157 | case HCI_ACLDATA_PKT: |
9c724357 | 158 | data->hdev->stat.acl_tx++; |
0d48d939 | 159 | break; |
1da177e4 | 160 | |
0d48d939 | 161 | case HCI_SCODATA_PKT: |
4f7ac181 | 162 | data->hdev->stat.sco_tx++; |
0d48d939 | 163 | break; |
1da177e4 LT |
164 | }; |
165 | ||
166 | return total; | |
167 | } | |
168 | ||
9c724357 MH |
169 | static ssize_t vhci_read(struct file *file, |
170 | char __user *buf, size_t count, loff_t *pos) | |
1da177e4 | 171 | { |
9c724357 | 172 | struct vhci_data *data = file->private_data; |
1da177e4 LT |
173 | struct sk_buff *skb; |
174 | ssize_t ret = 0; | |
175 | ||
1da177e4 | 176 | while (count) { |
9c724357 | 177 | skb = skb_dequeue(&data->readq); |
4db7589f MH |
178 | if (skb) { |
179 | ret = vhci_put_user(data, skb, buf, count); | |
180 | if (ret < 0) | |
181 | skb_queue_head(&data->readq, skb); | |
182 | else | |
183 | kfree_skb(skb); | |
184 | break; | |
1da177e4 LT |
185 | } |
186 | ||
4db7589f MH |
187 | if (file->f_flags & O_NONBLOCK) { |
188 | ret = -EAGAIN; | |
189 | break; | |
190 | } | |
1da177e4 | 191 | |
4db7589f MH |
192 | ret = wait_event_interruptible(data->read_wait, |
193 | !skb_queue_empty(&data->readq)); | |
194 | if (ret < 0) | |
195 | break; | |
1da177e4 | 196 | } |
1da177e4 LT |
197 | |
198 | return ret; | |
199 | } | |
200 | ||
4aa769b9 MH |
201 | static ssize_t vhci_write(struct file *file, |
202 | const char __user *buf, size_t count, loff_t *pos) | |
1da177e4 | 203 | { |
9c724357 | 204 | struct vhci_data *data = file->private_data; |
1da177e4 | 205 | |
9c724357 | 206 | return vhci_get_user(data, buf, count); |
1da177e4 LT |
207 | } |
208 | ||
4aa769b9 | 209 | static unsigned int vhci_poll(struct file *file, poll_table *wait) |
1da177e4 | 210 | { |
9c724357 | 211 | struct vhci_data *data = file->private_data; |
1da177e4 | 212 | |
9c724357 | 213 | poll_wait(file, &data->read_wait, wait); |
1da177e4 | 214 | |
9c724357 | 215 | if (!skb_queue_empty(&data->readq)) |
4aa769b9 MH |
216 | return POLLIN | POLLRDNORM; |
217 | ||
218 | return POLLOUT | POLLWRNORM; | |
219 | } | |
220 | ||
4aa769b9 | 221 | static int vhci_open(struct inode *inode, struct file *file) |
1da177e4 | 222 | { |
9c724357 | 223 | struct vhci_data *data; |
1da177e4 LT |
224 | struct hci_dev *hdev; |
225 | ||
9c724357 MH |
226 | data = kzalloc(sizeof(struct vhci_data), GFP_KERNEL); |
227 | if (!data) | |
1da177e4 LT |
228 | return -ENOMEM; |
229 | ||
9c724357 MH |
230 | skb_queue_head_init(&data->readq); |
231 | init_waitqueue_head(&data->read_wait); | |
1da177e4 | 232 | |
1da177e4 LT |
233 | hdev = hci_alloc_dev(); |
234 | if (!hdev) { | |
9c724357 | 235 | kfree(data); |
1da177e4 LT |
236 | return -ENOMEM; |
237 | } | |
238 | ||
9c724357 | 239 | data->hdev = hdev; |
1da177e4 | 240 | |
c13854ce | 241 | hdev->bus = HCI_VIRTUAL; |
9c724357 | 242 | hdev->driver_data = data; |
1da177e4 | 243 | |
36acbb1a AE |
244 | if (amp) |
245 | hdev->dev_type = HCI_AMP; | |
246 | ||
4aa769b9 MH |
247 | hdev->open = vhci_open_dev; |
248 | hdev->close = vhci_close_dev; | |
249 | hdev->flush = vhci_flush; | |
250 | hdev->send = vhci_send_frame; | |
251 | hdev->destruct = vhci_destruct; | |
1da177e4 LT |
252 | |
253 | hdev->owner = THIS_MODULE; | |
4aa769b9 | 254 | |
1da177e4 | 255 | if (hci_register_dev(hdev) < 0) { |
4aa769b9 | 256 | BT_ERR("Can't register HCI device"); |
9c724357 | 257 | kfree(data); |
1da177e4 LT |
258 | hci_free_dev(hdev); |
259 | return -EBUSY; | |
260 | } | |
261 | ||
9c724357 | 262 | file->private_data = data; |
4aa769b9 MH |
263 | |
264 | return nonseekable_open(inode, file); | |
1da177e4 LT |
265 | } |
266 | ||
4aa769b9 | 267 | static int vhci_release(struct inode *inode, struct file *file) |
1da177e4 | 268 | { |
9c724357 MH |
269 | struct vhci_data *data = file->private_data; |
270 | struct hci_dev *hdev = data->hdev; | |
1da177e4 | 271 | |
13ea4015 | 272 | hci_unregister_dev(hdev); |
1da177e4 LT |
273 | hci_free_dev(hdev); |
274 | ||
275 | file->private_data = NULL; | |
4aa769b9 MH |
276 | |
277 | return 0; | |
278 | } | |
279 | ||
2b8693c0 | 280 | static const struct file_operations vhci_fops = { |
fed4c250 | 281 | .owner = THIS_MODULE, |
4aa769b9 MH |
282 | .read = vhci_read, |
283 | .write = vhci_write, | |
284 | .poll = vhci_poll, | |
4aa769b9 MH |
285 | .open = vhci_open, |
286 | .release = vhci_release, | |
6038f373 | 287 | .llseek = no_llseek, |
1da177e4 LT |
288 | }; |
289 | ||
4aa769b9 | 290 | static struct miscdevice vhci_miscdev= { |
ac28494c MH |
291 | .name = "vhci", |
292 | .fops = &vhci_fops, | |
293 | .minor = MISC_DYNAMIC_MINOR, | |
1da177e4 LT |
294 | }; |
295 | ||
4aa769b9 | 296 | static int __init vhci_init(void) |
1da177e4 | 297 | { |
4aa769b9 | 298 | BT_INFO("Virtual HCI driver ver %s", VERSION); |
1da177e4 | 299 | |
329ab1b3 | 300 | return misc_register(&vhci_miscdev); |
1da177e4 LT |
301 | } |
302 | ||
4aa769b9 | 303 | static void __exit vhci_exit(void) |
1da177e4 | 304 | { |
329ab1b3 | 305 | misc_deregister(&vhci_miscdev); |
1da177e4 LT |
306 | } |
307 | ||
4aa769b9 MH |
308 | module_init(vhci_init); |
309 | module_exit(vhci_exit); | |
310 | ||
36acbb1a AE |
311 | module_param(amp, bool, 0644); |
312 | MODULE_PARM_DESC(amp, "Create AMP controller device"); | |
313 | ||
63fbd24e | 314 | MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); |
4aa769b9 MH |
315 | MODULE_DESCRIPTION("Bluetooth virtual HCI driver ver " VERSION); |
316 | MODULE_VERSION(VERSION); | |
317 | MODULE_LICENSE("GPL"); |