1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
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");
312
