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