Commit | Line | Data |
---|---|---|
8e87d142 | 1 | /* |
1da177e4 LT |
2 | HIDP implementation for Linux Bluetooth stack (BlueZ). |
3 | Copyright (C) 2003-2004 Marcel Holtmann <marcel@holtmann.org> | |
b4f34d8d | 4 | Copyright (C) 2013 David Herrmann <dh.herrmann@gmail.com> |
1da177e4 LT |
5 | |
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License version 2 as | |
8 | published by the Free Software Foundation; | |
9 | ||
10 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
11 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
12 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. | |
13 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY | |
8e87d142 YH |
14 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES |
15 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
16 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
1da177e4 LT |
17 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
18 | ||
8e87d142 YH |
19 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, |
20 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS | |
1da177e4 LT |
21 | SOFTWARE IS DISCLAIMED. |
22 | */ | |
23 | ||
b4f34d8d | 24 | #include <linux/kref.h> |
1da177e4 | 25 | #include <linux/module.h> |
1da177e4 | 26 | #include <linux/file.h> |
aabf6f89 | 27 | #include <linux/kthread.h> |
364f6351 | 28 | #include <linux/hidraw.h> |
1da177e4 LT |
29 | |
30 | #include <net/bluetooth/bluetooth.h> | |
0a85b964 | 31 | #include <net/bluetooth/hci_core.h> |
1da177e4 LT |
32 | #include <net/bluetooth/l2cap.h> |
33 | ||
34 | #include "hidp.h" | |
35 | ||
e1aaadd4 | 36 | #define VERSION "1.2" |
1da177e4 LT |
37 | |
38 | static DECLARE_RWSEM(hidp_session_sem); | |
39 | static LIST_HEAD(hidp_session_list); | |
40 | ||
41 | static unsigned char hidp_keycode[256] = { | |
17f09a7e SJ |
42 | 0, 0, 0, 0, 30, 48, 46, 32, 18, 33, 34, 35, 23, 36, |
43 | 37, 38, 50, 49, 24, 25, 16, 19, 31, 20, 22, 47, 17, 45, | |
44 | 21, 44, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 28, 1, | |
45 | 14, 15, 57, 12, 13, 26, 27, 43, 43, 39, 40, 41, 51, 52, | |
46 | 53, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 87, 88, | |
47 | 99, 70, 119, 110, 102, 104, 111, 107, 109, 106, 105, 108, 103, 69, | |
48 | 98, 55, 74, 78, 96, 79, 80, 81, 75, 76, 77, 71, 72, 73, | |
49 | 82, 83, 86, 127, 116, 117, 183, 184, 185, 186, 187, 188, 189, 190, | |
50 | 191, 192, 193, 194, 134, 138, 130, 132, 128, 129, 131, 137, 133, 135, | |
51 | 136, 113, 115, 114, 0, 0, 0, 121, 0, 89, 93, 124, 92, 94, | |
52 | 95, 0, 0, 0, 122, 123, 90, 91, 85, 0, 0, 0, 0, 0, | |
53 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
54 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
55 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
56 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
57 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
58 | 29, 42, 56, 125, 97, 54, 100, 126, 164, 166, 165, 163, 161, 115, | |
59 | 114, 113, 150, 158, 159, 128, 136, 177, 178, 176, 142, 152, 173, 140 | |
1da177e4 LT |
60 | }; |
61 | ||
62 | static unsigned char hidp_mkeyspat[] = { 0x01, 0x01, 0x01, 0x01, 0x01, 0x01 }; | |
63 | ||
b4f34d8d DH |
64 | static int hidp_session_probe(struct l2cap_conn *conn, |
65 | struct l2cap_user *user); | |
66 | static void hidp_session_remove(struct l2cap_conn *conn, | |
67 | struct l2cap_user *user); | |
68 | static int hidp_session_thread(void *arg); | |
69 | static void hidp_session_terminate(struct hidp_session *s); | |
70 | ||
5205185d | 71 | static void hidp_copy_session(struct hidp_session *session, struct hidp_conninfo *ci) |
1da177e4 | 72 | { |
d31dbf6e | 73 | memset(ci, 0, sizeof(*ci)); |
1da177e4 LT |
74 | bacpy(&ci->bdaddr, &session->bdaddr); |
75 | ||
76 | ci->flags = session->flags; | |
dcc07647 | 77 | ci->state = BT_CONNECTED; |
1da177e4 LT |
78 | |
79 | ci->vendor = 0x0000; | |
80 | ci->product = 0x0000; | |
81 | ci->version = 0x0000; | |
1da177e4 LT |
82 | |
83 | if (session->input) { | |
84 | ci->vendor = session->input->id.vendor; | |
85 | ci->product = session->input->id.product; | |
86 | ci->version = session->input->id.version; | |
87 | if (session->input->name) | |
88 | strncpy(ci->name, session->input->name, 128); | |
89 | else | |
90 | strncpy(ci->name, "HID Boot Device", 128); | |
91 | } | |
e1aaadd4 MH |
92 | |
93 | if (session->hid) { | |
94 | ci->vendor = session->hid->vendor; | |
95 | ci->product = session->hid->product; | |
96 | ci->version = session->hid->version; | |
97 | strncpy(ci->name, session->hid->name, 128); | |
98 | } | |
1da177e4 LT |
99 | } |
100 | ||
41edc0c0 DH |
101 | /* assemble skb, queue message on @transmit and wake up the session thread */ |
102 | static int hidp_send_message(struct hidp_session *session, struct socket *sock, | |
103 | struct sk_buff_head *transmit, unsigned char hdr, | |
104 | const unsigned char *data, int size) | |
105 | { | |
106 | struct sk_buff *skb; | |
107 | struct sock *sk = sock->sk; | |
108 | ||
109 | BT_DBG("session %p data %p size %d", session, data, size); | |
110 | ||
111 | if (atomic_read(&session->terminate)) | |
112 | return -EIO; | |
113 | ||
114 | skb = alloc_skb(size + 1, GFP_ATOMIC); | |
115 | if (!skb) { | |
116 | BT_ERR("Can't allocate memory for new frame"); | |
117 | return -ENOMEM; | |
118 | } | |
119 | ||
120 | *skb_put(skb, 1) = hdr; | |
121 | if (data && size > 0) | |
122 | memcpy(skb_put(skb, size), data, size); | |
123 | ||
124 | skb_queue_tail(transmit, skb); | |
125 | wake_up_interruptible(sk_sleep(sk)); | |
126 | ||
127 | return 0; | |
128 | } | |
129 | ||
130 | static int hidp_send_ctrl_message(struct hidp_session *session, | |
131 | unsigned char hdr, const unsigned char *data, | |
132 | int size) | |
133 | { | |
134 | return hidp_send_message(session, session->ctrl_sock, | |
135 | &session->ctrl_transmit, hdr, data, size); | |
136 | } | |
137 | ||
138 | static int hidp_send_intr_message(struct hidp_session *session, | |
139 | unsigned char hdr, const unsigned char *data, | |
140 | int size) | |
141 | { | |
142 | return hidp_send_message(session, session->intr_sock, | |
143 | &session->intr_transmit, hdr, data, size); | |
144 | } | |
145 | ||
af87b3d0 DH |
146 | static int hidp_input_event(struct input_dev *dev, unsigned int type, |
147 | unsigned int code, int value) | |
1da177e4 | 148 | { |
af87b3d0 | 149 | struct hidp_session *session = input_get_drvdata(dev); |
1da177e4 | 150 | unsigned char newleds; |
41edc0c0 | 151 | unsigned char hdr, data[2]; |
1da177e4 | 152 | |
af87b3d0 DH |
153 | BT_DBG("session %p type %d code %d value %d", |
154 | session, type, code, value); | |
1da177e4 LT |
155 | |
156 | if (type != EV_LED) | |
157 | return -1; | |
158 | ||
159 | newleds = (!!test_bit(LED_KANA, dev->led) << 3) | | |
160 | (!!test_bit(LED_COMPOSE, dev->led) << 3) | | |
161 | (!!test_bit(LED_SCROLLL, dev->led) << 2) | | |
162 | (!!test_bit(LED_CAPSL, dev->led) << 1) | | |
163 | (!!test_bit(LED_NUML, dev->led)); | |
164 | ||
165 | if (session->leds == newleds) | |
166 | return 0; | |
167 | ||
168 | session->leds = newleds; | |
169 | ||
41edc0c0 DH |
170 | hdr = HIDP_TRANS_DATA | HIDP_DATA_RTYPE_OUPUT; |
171 | data[0] = 0x01; | |
172 | data[1] = newleds; | |
1da177e4 | 173 | |
41edc0c0 | 174 | return hidp_send_intr_message(session, hdr, data, 2); |
1da177e4 LT |
175 | } |
176 | ||
177 | static void hidp_input_report(struct hidp_session *session, struct sk_buff *skb) | |
178 | { | |
179 | struct input_dev *dev = session->input; | |
180 | unsigned char *keys = session->keys; | |
181 | unsigned char *udata = skb->data + 1; | |
182 | signed char *sdata = skb->data + 1; | |
183 | int i, size = skb->len - 1; | |
184 | ||
185 | switch (skb->data[0]) { | |
186 | case 0x01: /* Keyboard report */ | |
187 | for (i = 0; i < 8; i++) | |
188 | input_report_key(dev, hidp_keycode[i + 224], (udata[0] >> i) & 1); | |
189 | ||
190 | /* If all the key codes have been set to 0x01, it means | |
191 | * too many keys were pressed at the same time. */ | |
192 | if (!memcmp(udata + 2, hidp_mkeyspat, 6)) | |
193 | break; | |
194 | ||
195 | for (i = 2; i < 8; i++) { | |
196 | if (keys[i] > 3 && memscan(udata + 2, keys[i], 6) == udata + 8) { | |
197 | if (hidp_keycode[keys[i]]) | |
198 | input_report_key(dev, hidp_keycode[keys[i]], 0); | |
199 | else | |
200 | BT_ERR("Unknown key (scancode %#x) released.", keys[i]); | |
201 | } | |
202 | ||
203 | if (udata[i] > 3 && memscan(keys + 2, udata[i], 6) == keys + 8) { | |
204 | if (hidp_keycode[udata[i]]) | |
205 | input_report_key(dev, hidp_keycode[udata[i]], 1); | |
206 | else | |
207 | BT_ERR("Unknown key (scancode %#x) pressed.", udata[i]); | |
208 | } | |
209 | } | |
210 | ||
211 | memcpy(keys, udata, 8); | |
212 | break; | |
213 | ||
214 | case 0x02: /* Mouse report */ | |
215 | input_report_key(dev, BTN_LEFT, sdata[0] & 0x01); | |
216 | input_report_key(dev, BTN_RIGHT, sdata[0] & 0x02); | |
217 | input_report_key(dev, BTN_MIDDLE, sdata[0] & 0x04); | |
218 | input_report_key(dev, BTN_SIDE, sdata[0] & 0x08); | |
219 | input_report_key(dev, BTN_EXTRA, sdata[0] & 0x10); | |
220 | ||
221 | input_report_rel(dev, REL_X, sdata[1]); | |
222 | input_report_rel(dev, REL_Y, sdata[2]); | |
223 | ||
224 | if (size > 3) | |
225 | input_report_rel(dev, REL_WHEEL, sdata[3]); | |
226 | break; | |
227 | } | |
228 | ||
229 | input_sync(dev); | |
230 | } | |
231 | ||
e1aaadd4 MH |
232 | static int hidp_send_report(struct hidp_session *session, struct hid_report *report) |
233 | { | |
b2b6cada JK |
234 | unsigned char hdr; |
235 | u8 *buf; | |
236 | int rsize, ret; | |
e1aaadd4 | 237 | |
b2b6cada JK |
238 | buf = hid_alloc_report_buf(report, GFP_ATOMIC); |
239 | if (!buf) | |
e1aaadd4 MH |
240 | return -EIO; |
241 | ||
242 | hid_output_report(report, buf); | |
41edc0c0 | 243 | hdr = HIDP_TRANS_DATA | HIDP_DATA_RTYPE_OUPUT; |
e1aaadd4 | 244 | |
88e2194c | 245 | rsize = ((report->size - 1) >> 3) + 1 + (report->id > 0); |
b2b6cada JK |
246 | ret = hidp_send_intr_message(session, hdr, buf, rsize); |
247 | ||
248 | kfree(buf); | |
249 | return ret; | |
e1aaadd4 MH |
250 | } |
251 | ||
0ff1731a AO |
252 | static int hidp_get_raw_report(struct hid_device *hid, |
253 | unsigned char report_number, | |
254 | unsigned char *data, size_t count, | |
255 | unsigned char report_type) | |
256 | { | |
257 | struct hidp_session *session = hid->driver_data; | |
258 | struct sk_buff *skb; | |
259 | size_t len; | |
260 | int numbered_reports = hid->report_enum[report_type].numbered; | |
794d1756 | 261 | int ret; |
0ff1731a | 262 | |
fd86c9be KR |
263 | if (atomic_read(&session->terminate)) |
264 | return -EIO; | |
265 | ||
0ff1731a AO |
266 | switch (report_type) { |
267 | case HID_FEATURE_REPORT: | |
268 | report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_FEATURE; | |
269 | break; | |
270 | case HID_INPUT_REPORT: | |
271 | report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_INPUT; | |
272 | break; | |
273 | case HID_OUTPUT_REPORT: | |
274 | report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_OUPUT; | |
275 | break; | |
276 | default: | |
277 | return -EINVAL; | |
278 | } | |
279 | ||
280 | if (mutex_lock_interruptible(&session->report_mutex)) | |
281 | return -ERESTARTSYS; | |
282 | ||
283 | /* Set up our wait, and send the report request to the device. */ | |
284 | session->waiting_report_type = report_type & HIDP_DATA_RTYPE_MASK; | |
285 | session->waiting_report_number = numbered_reports ? report_number : -1; | |
286 | set_bit(HIDP_WAITING_FOR_RETURN, &session->flags); | |
287 | data[0] = report_number; | |
41edc0c0 | 288 | ret = hidp_send_ctrl_message(session, report_type, data, 1); |
794d1756 DH |
289 | if (ret) |
290 | goto err; | |
0ff1731a AO |
291 | |
292 | /* Wait for the return of the report. The returned report | |
293 | gets put in session->report_return. */ | |
e3492dc3 DH |
294 | while (test_bit(HIDP_WAITING_FOR_RETURN, &session->flags) && |
295 | !atomic_read(&session->terminate)) { | |
0ff1731a AO |
296 | int res; |
297 | ||
298 | res = wait_event_interruptible_timeout(session->report_queue, | |
e3492dc3 DH |
299 | !test_bit(HIDP_WAITING_FOR_RETURN, &session->flags) |
300 | || atomic_read(&session->terminate), | |
0ff1731a AO |
301 | 5*HZ); |
302 | if (res == 0) { | |
303 | /* timeout */ | |
794d1756 DH |
304 | ret = -EIO; |
305 | goto err; | |
0ff1731a AO |
306 | } |
307 | if (res < 0) { | |
308 | /* signal */ | |
794d1756 DH |
309 | ret = -ERESTARTSYS; |
310 | goto err; | |
0ff1731a AO |
311 | } |
312 | } | |
313 | ||
314 | skb = session->report_return; | |
315 | if (skb) { | |
316 | len = skb->len < count ? skb->len : count; | |
317 | memcpy(data, skb->data, len); | |
318 | ||
319 | kfree_skb(skb); | |
320 | session->report_return = NULL; | |
321 | } else { | |
322 | /* Device returned a HANDSHAKE, indicating protocol error. */ | |
323 | len = -EIO; | |
324 | } | |
325 | ||
326 | clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags); | |
327 | mutex_unlock(&session->report_mutex); | |
328 | ||
329 | return len; | |
330 | ||
794d1756 | 331 | err: |
0ff1731a AO |
332 | clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags); |
333 | mutex_unlock(&session->report_mutex); | |
794d1756 | 334 | return ret; |
0ff1731a AO |
335 | } |
336 | ||
d4bfa033 JK |
337 | static int hidp_output_raw_report(struct hid_device *hid, unsigned char *data, size_t count, |
338 | unsigned char report_type) | |
2da31939 | 339 | { |
0825411a AO |
340 | struct hidp_session *session = hid->driver_data; |
341 | int ret; | |
342 | ||
e73dcfbf | 343 | if (report_type == HID_OUTPUT_REPORT) { |
41edc0c0 | 344 | report_type = HIDP_TRANS_DATA | HIDP_DATA_RTYPE_OUPUT; |
e73dcfbf DH |
345 | return hidp_send_intr_message(session, report_type, |
346 | data, count); | |
347 | } else if (report_type != HID_FEATURE_REPORT) { | |
d4bfa033 JK |
348 | return -EINVAL; |
349 | } | |
350 | ||
0825411a AO |
351 | if (mutex_lock_interruptible(&session->report_mutex)) |
352 | return -ERESTARTSYS; | |
353 | ||
354 | /* Set up our wait, and send the report request to the device. */ | |
355 | set_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags); | |
e73dcfbf | 356 | report_type = HIDP_TRANS_SET_REPORT | HIDP_DATA_RTYPE_FEATURE; |
41edc0c0 | 357 | ret = hidp_send_ctrl_message(session, report_type, data, count); |
794d1756 | 358 | if (ret) |
0825411a | 359 | goto err; |
0825411a AO |
360 | |
361 | /* Wait for the ACK from the device. */ | |
e3492dc3 DH |
362 | while (test_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags) && |
363 | !atomic_read(&session->terminate)) { | |
0825411a AO |
364 | int res; |
365 | ||
366 | res = wait_event_interruptible_timeout(session->report_queue, | |
e3492dc3 DH |
367 | !test_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags) |
368 | || atomic_read(&session->terminate), | |
0825411a AO |
369 | 10*HZ); |
370 | if (res == 0) { | |
371 | /* timeout */ | |
372 | ret = -EIO; | |
373 | goto err; | |
374 | } | |
375 | if (res < 0) { | |
376 | /* signal */ | |
377 | ret = -ERESTARTSYS; | |
378 | goto err; | |
379 | } | |
380 | } | |
381 | ||
382 | if (!session->output_report_success) { | |
383 | ret = -EIO; | |
384 | goto err; | |
385 | } | |
386 | ||
387 | ret = count; | |
388 | ||
389 | err: | |
390 | clear_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags); | |
391 | mutex_unlock(&session->report_mutex); | |
392 | return ret; | |
2da31939 JK |
393 | } |
394 | ||
1da177e4 LT |
395 | static void hidp_idle_timeout(unsigned long arg) |
396 | { | |
397 | struct hidp_session *session = (struct hidp_session *) arg; | |
398 | ||
c4582077 DH |
399 | /* The HIDP user-space API only contains calls to add and remove |
400 | * devices. There is no way to forward events of any kind. Therefore, | |
401 | * we have to forcefully disconnect a device on idle-timeouts. This is | |
402 | * unfortunate and weird API design, but it is spec-compliant and | |
403 | * required for backwards-compatibility. Hence, on idle-timeout, we | |
404 | * signal driver-detach events, so poll() will be woken up with an | |
405 | * error-condition on both sockets. | |
406 | */ | |
407 | ||
408 | session->intr_sock->sk->sk_err = EUNATCH; | |
409 | session->ctrl_sock->sk->sk_err = EUNATCH; | |
410 | wake_up_interruptible(sk_sleep(session->intr_sock->sk)); | |
411 | wake_up_interruptible(sk_sleep(session->ctrl_sock->sk)); | |
412 | ||
5205185d | 413 | hidp_session_terminate(session); |
1da177e4 LT |
414 | } |
415 | ||
91f5cca3 | 416 | static void hidp_set_timer(struct hidp_session *session) |
1da177e4 LT |
417 | { |
418 | if (session->idle_to > 0) | |
419 | mod_timer(&session->timer, jiffies + HZ * session->idle_to); | |
420 | } | |
421 | ||
6039aa73 | 422 | static void hidp_del_timer(struct hidp_session *session) |
1da177e4 LT |
423 | { |
424 | if (session->idle_to > 0) | |
425 | del_timer(&session->timer); | |
426 | } | |
427 | ||
91f5cca3 AM |
428 | static void hidp_process_handshake(struct hidp_session *session, |
429 | unsigned char param) | |
1da177e4 LT |
430 | { |
431 | BT_DBG("session %p param 0x%02x", session, param); | |
0825411a | 432 | session->output_report_success = 0; /* default condition */ |
1da177e4 LT |
433 | |
434 | switch (param) { | |
435 | case HIDP_HSHK_SUCCESSFUL: | |
436 | /* FIXME: Call into SET_ GET_ handlers here */ | |
0825411a | 437 | session->output_report_success = 1; |
1da177e4 LT |
438 | break; |
439 | ||
440 | case HIDP_HSHK_NOT_READY: | |
441 | case HIDP_HSHK_ERR_INVALID_REPORT_ID: | |
442 | case HIDP_HSHK_ERR_UNSUPPORTED_REQUEST: | |
443 | case HIDP_HSHK_ERR_INVALID_PARAMETER: | |
ab88f714 | 444 | if (test_and_clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags)) |
0ff1731a | 445 | wake_up_interruptible(&session->report_queue); |
ab88f714 | 446 | |
1da177e4 LT |
447 | /* FIXME: Call into SET_ GET_ handlers here */ |
448 | break; | |
449 | ||
450 | case HIDP_HSHK_ERR_UNKNOWN: | |
451 | break; | |
452 | ||
453 | case HIDP_HSHK_ERR_FATAL: | |
454 | /* Device requests a reboot, as this is the only way this error | |
8e87d142 | 455 | * can be recovered. */ |
41edc0c0 | 456 | hidp_send_ctrl_message(session, |
1da177e4 LT |
457 | HIDP_TRANS_HID_CONTROL | HIDP_CTRL_SOFT_RESET, NULL, 0); |
458 | break; | |
459 | ||
460 | default: | |
41edc0c0 | 461 | hidp_send_ctrl_message(session, |
1da177e4 LT |
462 | HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_INVALID_PARAMETER, NULL, 0); |
463 | break; | |
464 | } | |
0825411a AO |
465 | |
466 | /* Wake up the waiting thread. */ | |
ab88f714 | 467 | if (test_and_clear_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags)) |
0825411a | 468 | wake_up_interruptible(&session->report_queue); |
1da177e4 LT |
469 | } |
470 | ||
91f5cca3 AM |
471 | static void hidp_process_hid_control(struct hidp_session *session, |
472 | unsigned char param) | |
1da177e4 LT |
473 | { |
474 | BT_DBG("session %p param 0x%02x", session, param); | |
475 | ||
eff001e3 | 476 | if (param == HIDP_CTRL_VIRTUAL_CABLE_UNPLUG) { |
1da177e4 LT |
477 | /* Flush the transmit queues */ |
478 | skb_queue_purge(&session->ctrl_transmit); | |
479 | skb_queue_purge(&session->intr_transmit); | |
480 | ||
5205185d | 481 | hidp_session_terminate(session); |
1da177e4 LT |
482 | } |
483 | } | |
484 | ||
0ff1731a AO |
485 | /* Returns true if the passed-in skb should be freed by the caller. */ |
486 | static int hidp_process_data(struct hidp_session *session, struct sk_buff *skb, | |
91f5cca3 | 487 | unsigned char param) |
1da177e4 | 488 | { |
0ff1731a | 489 | int done_with_skb = 1; |
1da177e4 LT |
490 | BT_DBG("session %p skb %p len %d param 0x%02x", session, skb, skb->len, param); |
491 | ||
492 | switch (param) { | |
493 | case HIDP_DATA_RTYPE_INPUT: | |
494 | hidp_set_timer(session); | |
495 | ||
496 | if (session->input) | |
497 | hidp_input_report(session, skb); | |
e1aaadd4 MH |
498 | |
499 | if (session->hid) | |
500 | hid_input_report(session->hid, HID_INPUT_REPORT, skb->data, skb->len, 0); | |
1da177e4 LT |
501 | break; |
502 | ||
503 | case HIDP_DATA_RTYPE_OTHER: | |
504 | case HIDP_DATA_RTYPE_OUPUT: | |
505 | case HIDP_DATA_RTYPE_FEATURE: | |
506 | break; | |
507 | ||
508 | default: | |
41edc0c0 | 509 | hidp_send_ctrl_message(session, |
1da177e4 LT |
510 | HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_INVALID_PARAMETER, NULL, 0); |
511 | } | |
0ff1731a AO |
512 | |
513 | if (test_bit(HIDP_WAITING_FOR_RETURN, &session->flags) && | |
514 | param == session->waiting_report_type) { | |
515 | if (session->waiting_report_number < 0 || | |
516 | session->waiting_report_number == skb->data[0]) { | |
517 | /* hidp_get_raw_report() is waiting on this report. */ | |
518 | session->report_return = skb; | |
519 | done_with_skb = 0; | |
520 | clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags); | |
521 | wake_up_interruptible(&session->report_queue); | |
522 | } | |
523 | } | |
524 | ||
525 | return done_with_skb; | |
1da177e4 LT |
526 | } |
527 | ||
91f5cca3 AM |
528 | static void hidp_recv_ctrl_frame(struct hidp_session *session, |
529 | struct sk_buff *skb) | |
1da177e4 LT |
530 | { |
531 | unsigned char hdr, type, param; | |
0ff1731a | 532 | int free_skb = 1; |
1da177e4 LT |
533 | |
534 | BT_DBG("session %p skb %p len %d", session, skb, skb->len); | |
535 | ||
536 | hdr = skb->data[0]; | |
537 | skb_pull(skb, 1); | |
538 | ||
539 | type = hdr & HIDP_HEADER_TRANS_MASK; | |
540 | param = hdr & HIDP_HEADER_PARAM_MASK; | |
541 | ||
542 | switch (type) { | |
543 | case HIDP_TRANS_HANDSHAKE: | |
544 | hidp_process_handshake(session, param); | |
545 | break; | |
546 | ||
547 | case HIDP_TRANS_HID_CONTROL: | |
548 | hidp_process_hid_control(session, param); | |
549 | break; | |
550 | ||
551 | case HIDP_TRANS_DATA: | |
0ff1731a | 552 | free_skb = hidp_process_data(session, skb, param); |
1da177e4 LT |
553 | break; |
554 | ||
555 | default: | |
41edc0c0 | 556 | hidp_send_ctrl_message(session, |
1da177e4 LT |
557 | HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_UNSUPPORTED_REQUEST, NULL, 0); |
558 | break; | |
559 | } | |
560 | ||
0ff1731a AO |
561 | if (free_skb) |
562 | kfree_skb(skb); | |
1da177e4 LT |
563 | } |
564 | ||
91f5cca3 AM |
565 | static void hidp_recv_intr_frame(struct hidp_session *session, |
566 | struct sk_buff *skb) | |
1da177e4 LT |
567 | { |
568 | unsigned char hdr; | |
569 | ||
570 | BT_DBG("session %p skb %p len %d", session, skb, skb->len); | |
571 | ||
572 | hdr = skb->data[0]; | |
573 | skb_pull(skb, 1); | |
574 | ||
575 | if (hdr == (HIDP_TRANS_DATA | HIDP_DATA_RTYPE_INPUT)) { | |
576 | hidp_set_timer(session); | |
e1aaadd4 | 577 | |
1da177e4 LT |
578 | if (session->input) |
579 | hidp_input_report(session, skb); | |
e1aaadd4 MH |
580 | |
581 | if (session->hid) { | |
582 | hid_input_report(session->hid, HID_INPUT_REPORT, skb->data, skb->len, 1); | |
583 | BT_DBG("report len %d", skb->len); | |
584 | } | |
1da177e4 LT |
585 | } else { |
586 | BT_DBG("Unsupported protocol header 0x%02x", hdr); | |
587 | } | |
588 | ||
589 | kfree_skb(skb); | |
590 | } | |
591 | ||
592 | static int hidp_send_frame(struct socket *sock, unsigned char *data, int len) | |
593 | { | |
594 | struct kvec iv = { data, len }; | |
595 | struct msghdr msg; | |
596 | ||
597 | BT_DBG("sock %p data %p len %d", sock, data, len); | |
598 | ||
599 | if (!len) | |
600 | return 0; | |
601 | ||
602 | memset(&msg, 0, sizeof(msg)); | |
603 | ||
604 | return kernel_sendmsg(sock, &msg, &iv, 1, len); | |
605 | } | |
606 | ||
7350e6cf DH |
607 | /* dequeue message from @transmit and send via @sock */ |
608 | static void hidp_process_transmit(struct hidp_session *session, | |
609 | struct sk_buff_head *transmit, | |
610 | struct socket *sock) | |
1da177e4 LT |
611 | { |
612 | struct sk_buff *skb; | |
2df01200 | 613 | int ret; |
1da177e4 LT |
614 | |
615 | BT_DBG("session %p", session); | |
616 | ||
7350e6cf DH |
617 | while ((skb = skb_dequeue(transmit))) { |
618 | ret = hidp_send_frame(sock, skb->data, skb->len); | |
2df01200 | 619 | if (ret == -EAGAIN) { |
7350e6cf | 620 | skb_queue_head(transmit, skb); |
1da177e4 | 621 | break; |
2df01200 DH |
622 | } else if (ret < 0) { |
623 | hidp_session_terminate(session); | |
624 | kfree_skb(skb); | |
625 | break; | |
1da177e4 LT |
626 | } |
627 | ||
628 | hidp_set_timer(session); | |
629 | kfree_skb(skb); | |
630 | } | |
1da177e4 LT |
631 | } |
632 | ||
91f5cca3 AM |
633 | static int hidp_setup_input(struct hidp_session *session, |
634 | struct hidp_connadd_req *req) | |
1da177e4 | 635 | { |
c500c971 | 636 | struct input_dev *input; |
3415a5fd | 637 | int i; |
1da177e4 | 638 | |
c500c971 JS |
639 | input = input_allocate_device(); |
640 | if (!input) | |
641 | return -ENOMEM; | |
642 | ||
643 | session->input = input; | |
644 | ||
5be39466 | 645 | input_set_drvdata(input, session); |
1da177e4 | 646 | |
34abf91f DT |
647 | input->name = "Bluetooth HID Boot Protocol Device"; |
648 | ||
1da177e4 LT |
649 | input->id.bustype = BUS_BLUETOOTH; |
650 | input->id.vendor = req->vendor; | |
651 | input->id.product = req->product; | |
652 | input->id.version = req->version; | |
653 | ||
654 | if (req->subclass & 0x40) { | |
655 | set_bit(EV_KEY, input->evbit); | |
656 | set_bit(EV_LED, input->evbit); | |
657 | set_bit(EV_REP, input->evbit); | |
658 | ||
659 | set_bit(LED_NUML, input->ledbit); | |
660 | set_bit(LED_CAPSL, input->ledbit); | |
661 | set_bit(LED_SCROLLL, input->ledbit); | |
662 | set_bit(LED_COMPOSE, input->ledbit); | |
663 | set_bit(LED_KANA, input->ledbit); | |
664 | ||
665 | for (i = 0; i < sizeof(hidp_keycode); i++) | |
666 | set_bit(hidp_keycode[i], input->keybit); | |
667 | clear_bit(0, input->keybit); | |
668 | } | |
669 | ||
670 | if (req->subclass & 0x80) { | |
7b19ada2 JS |
671 | input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL); |
672 | input->keybit[BIT_WORD(BTN_MOUSE)] = BIT_MASK(BTN_LEFT) | | |
673 | BIT_MASK(BTN_RIGHT) | BIT_MASK(BTN_MIDDLE); | |
674 | input->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y); | |
675 | input->keybit[BIT_WORD(BTN_MOUSE)] |= BIT_MASK(BTN_SIDE) | | |
676 | BIT_MASK(BTN_EXTRA); | |
677 | input->relbit[0] |= BIT_MASK(REL_WHEEL); | |
1da177e4 LT |
678 | } |
679 | ||
5205185d | 680 | input->dev.parent = &session->conn->hcon->dev; |
0a85b964 | 681 | |
1da177e4 LT |
682 | input->event = hidp_input_event; |
683 | ||
edad6388 | 684 | return 0; |
1da177e4 LT |
685 | } |
686 | ||
f5ffd462 MH |
687 | static int hidp_open(struct hid_device *hid) |
688 | { | |
689 | return 0; | |
690 | } | |
691 | ||
692 | static void hidp_close(struct hid_device *hid) | |
693 | { | |
694 | } | |
695 | ||
c500c971 JS |
696 | static int hidp_parse(struct hid_device *hid) |
697 | { | |
698 | struct hidp_session *session = hid->driver_data; | |
c500c971 | 699 | |
15c697ce MP |
700 | return hid_parse_report(session->hid, session->rd_data, |
701 | session->rd_size); | |
c500c971 JS |
702 | } |
703 | ||
704 | static int hidp_start(struct hid_device *hid) | |
705 | { | |
706 | struct hidp_session *session = hid->driver_data; | |
707 | struct hid_report *report; | |
708 | ||
142c69c6 DH |
709 | if (hid->quirks & HID_QUIRK_NO_INIT_REPORTS) |
710 | return 0; | |
711 | ||
c500c971 JS |
712 | list_for_each_entry(report, &hid->report_enum[HID_INPUT_REPORT]. |
713 | report_list, list) | |
714 | hidp_send_report(session, report); | |
715 | ||
716 | list_for_each_entry(report, &hid->report_enum[HID_FEATURE_REPORT]. | |
717 | report_list, list) | |
718 | hidp_send_report(session, report); | |
719 | ||
c500c971 JS |
720 | return 0; |
721 | } | |
722 | ||
723 | static void hidp_stop(struct hid_device *hid) | |
724 | { | |
725 | struct hidp_session *session = hid->driver_data; | |
726 | ||
727 | skb_queue_purge(&session->ctrl_transmit); | |
728 | skb_queue_purge(&session->intr_transmit); | |
729 | ||
c500c971 JS |
730 | hid->claimed = 0; |
731 | } | |
732 | ||
733 | static struct hid_ll_driver hidp_hid_driver = { | |
734 | .parse = hidp_parse, | |
735 | .start = hidp_start, | |
736 | .stop = hidp_stop, | |
737 | .open = hidp_open, | |
738 | .close = hidp_close, | |
c500c971 JS |
739 | }; |
740 | ||
0f69dca2 AO |
741 | /* This function sets up the hid device. It does not add it |
742 | to the HID system. That is done in hidp_add_connection(). */ | |
85cdaf52 | 743 | static int hidp_setup_hid(struct hidp_session *session, |
91f5cca3 | 744 | struct hidp_connadd_req *req) |
e1aaadd4 | 745 | { |
c500c971 | 746 | struct hid_device *hid; |
edad6388 | 747 | int err; |
e1aaadd4 | 748 | |
15c697ce MP |
749 | session->rd_data = kzalloc(req->rd_size, GFP_KERNEL); |
750 | if (!session->rd_data) | |
751 | return -ENOMEM; | |
752 | ||
753 | if (copy_from_user(session->rd_data, req->rd_data, req->rd_size)) { | |
754 | err = -EFAULT; | |
755 | goto fault; | |
756 | } | |
757 | session->rd_size = req->rd_size; | |
758 | ||
c500c971 | 759 | hid = hid_allocate_device(); |
15c697ce MP |
760 | if (IS_ERR(hid)) { |
761 | err = PTR_ERR(hid); | |
762 | goto fault; | |
763 | } | |
e1aaadd4 | 764 | |
c500c971 | 765 | session->hid = hid; |
15c697ce | 766 | |
e1aaadd4 MH |
767 | hid->driver_data = session; |
768 | ||
e1aaadd4 MH |
769 | hid->bus = BUS_BLUETOOTH; |
770 | hid->vendor = req->vendor; | |
771 | hid->product = req->product; | |
772 | hid->version = req->version; | |
c500c971 | 773 | hid->country = req->country; |
e1aaadd4 | 774 | |
0a9ab9bd | 775 | strncpy(hid->name, req->name, sizeof(req->name) - 1); |
fcb73338 AE |
776 | |
777 | snprintf(hid->phys, sizeof(hid->phys), "%pMR", | |
778 | &bt_sk(session->ctrl_sock->sk)->src); | |
779 | ||
780 | snprintf(hid->uniq, sizeof(hid->uniq), "%pMR", | |
781 | &bt_sk(session->ctrl_sock->sk)->dst); | |
e1aaadd4 | 782 | |
5205185d | 783 | hid->dev.parent = &session->conn->hcon->dev; |
c500c971 | 784 | hid->ll_driver = &hidp_hid_driver; |
85cdaf52 | 785 | |
0ff1731a | 786 | hid->hid_get_raw_report = hidp_get_raw_report; |
2da31939 JK |
787 | hid->hid_output_raw_report = hidp_output_raw_report; |
788 | ||
4529eefa LS |
789 | /* True if device is blacklisted in drivers/hid/hid-core.c */ |
790 | if (hid_ignore(hid)) { | |
791 | hid_destroy_device(session->hid); | |
792 | session->hid = NULL; | |
793 | return -ENODEV; | |
794 | } | |
795 | ||
c500c971 | 796 | return 0; |
edad6388 | 797 | |
15c697ce MP |
798 | fault: |
799 | kfree(session->rd_data); | |
800 | session->rd_data = NULL; | |
801 | ||
edad6388 | 802 | return err; |
e1aaadd4 MH |
803 | } |
804 | ||
b4f34d8d DH |
805 | /* initialize session devices */ |
806 | static int hidp_session_dev_init(struct hidp_session *session, | |
807 | struct hidp_connadd_req *req) | |
808 | { | |
809 | int ret; | |
810 | ||
811 | if (req->rd_size > 0) { | |
812 | ret = hidp_setup_hid(session, req); | |
813 | if (ret && ret != -ENODEV) | |
814 | return ret; | |
815 | } | |
816 | ||
817 | if (!session->hid) { | |
818 | ret = hidp_setup_input(session, req); | |
819 | if (ret < 0) | |
820 | return ret; | |
821 | } | |
822 | ||
823 | return 0; | |
824 | } | |
825 | ||
826 | /* destroy session devices */ | |
827 | static void hidp_session_dev_destroy(struct hidp_session *session) | |
828 | { | |
829 | if (session->hid) | |
830 | put_device(&session->hid->dev); | |
831 | else if (session->input) | |
832 | input_put_device(session->input); | |
833 | ||
834 | kfree(session->rd_data); | |
835 | session->rd_data = NULL; | |
836 | } | |
837 | ||
838 | /* add HID/input devices to their underlying bus systems */ | |
839 | static int hidp_session_dev_add(struct hidp_session *session) | |
840 | { | |
841 | int ret; | |
842 | ||
843 | /* Both HID and input systems drop a ref-count when unregistering the | |
844 | * device but they don't take a ref-count when registering them. Work | |
845 | * around this by explicitly taking a refcount during registration | |
846 | * which is dropped automatically by unregistering the devices. */ | |
847 | ||
848 | if (session->hid) { | |
849 | ret = hid_add_device(session->hid); | |
850 | if (ret) | |
851 | return ret; | |
852 | get_device(&session->hid->dev); | |
853 | } else if (session->input) { | |
854 | ret = input_register_device(session->input); | |
855 | if (ret) | |
856 | return ret; | |
857 | input_get_device(session->input); | |
858 | } | |
859 | ||
860 | return 0; | |
861 | } | |
862 | ||
863 | /* remove HID/input devices from their bus systems */ | |
864 | static void hidp_session_dev_del(struct hidp_session *session) | |
865 | { | |
866 | if (session->hid) | |
867 | hid_destroy_device(session->hid); | |
868 | else if (session->input) | |
869 | input_unregister_device(session->input); | |
870 | } | |
871 | ||
872 | /* | |
873 | * Create new session object | |
874 | * Allocate session object, initialize static fields, copy input data into the | |
875 | * object and take a reference to all sub-objects. | |
876 | * This returns 0 on success and puts a pointer to the new session object in | |
877 | * \out. Otherwise, an error code is returned. | |
878 | * The new session object has an initial ref-count of 1. | |
879 | */ | |
880 | static int hidp_session_new(struct hidp_session **out, const bdaddr_t *bdaddr, | |
881 | struct socket *ctrl_sock, | |
882 | struct socket *intr_sock, | |
883 | struct hidp_connadd_req *req, | |
884 | struct l2cap_conn *conn) | |
885 | { | |
886 | struct hidp_session *session; | |
887 | int ret; | |
888 | struct bt_sock *ctrl, *intr; | |
889 | ||
890 | ctrl = bt_sk(ctrl_sock->sk); | |
891 | intr = bt_sk(intr_sock->sk); | |
892 | ||
893 | session = kzalloc(sizeof(*session), GFP_KERNEL); | |
894 | if (!session) | |
895 | return -ENOMEM; | |
896 | ||
897 | /* object and runtime management */ | |
898 | kref_init(&session->ref); | |
899 | atomic_set(&session->state, HIDP_SESSION_IDLING); | |
900 | init_waitqueue_head(&session->state_queue); | |
901 | session->flags = req->flags & (1 << HIDP_BLUETOOTH_VENDOR_ID); | |
902 | ||
903 | /* connection management */ | |
904 | bacpy(&session->bdaddr, bdaddr); | |
905 | session->conn = conn; | |
906 | session->user.probe = hidp_session_probe; | |
907 | session->user.remove = hidp_session_remove; | |
908 | session->ctrl_sock = ctrl_sock; | |
909 | session->intr_sock = intr_sock; | |
910 | skb_queue_head_init(&session->ctrl_transmit); | |
911 | skb_queue_head_init(&session->intr_transmit); | |
912 | session->ctrl_mtu = min_t(uint, l2cap_pi(ctrl)->chan->omtu, | |
913 | l2cap_pi(ctrl)->chan->imtu); | |
914 | session->intr_mtu = min_t(uint, l2cap_pi(intr)->chan->omtu, | |
915 | l2cap_pi(intr)->chan->imtu); | |
916 | session->idle_to = req->idle_to; | |
917 | ||
918 | /* device management */ | |
919 | setup_timer(&session->timer, hidp_idle_timeout, | |
920 | (unsigned long)session); | |
921 | ||
922 | /* session data */ | |
923 | mutex_init(&session->report_mutex); | |
924 | init_waitqueue_head(&session->report_queue); | |
925 | ||
926 | ret = hidp_session_dev_init(session, req); | |
927 | if (ret) | |
928 | goto err_free; | |
929 | ||
930 | l2cap_conn_get(session->conn); | |
931 | get_file(session->intr_sock->file); | |
932 | get_file(session->ctrl_sock->file); | |
933 | *out = session; | |
934 | return 0; | |
935 | ||
936 | err_free: | |
937 | kfree(session); | |
938 | return ret; | |
939 | } | |
940 | ||
941 | /* increase ref-count of the given session by one */ | |
942 | static void hidp_session_get(struct hidp_session *session) | |
943 | { | |
944 | kref_get(&session->ref); | |
945 | } | |
946 | ||
947 | /* release callback */ | |
948 | static void session_free(struct kref *ref) | |
949 | { | |
950 | struct hidp_session *session = container_of(ref, struct hidp_session, | |
951 | ref); | |
952 | ||
953 | hidp_session_dev_destroy(session); | |
954 | skb_queue_purge(&session->ctrl_transmit); | |
955 | skb_queue_purge(&session->intr_transmit); | |
956 | fput(session->intr_sock->file); | |
957 | fput(session->ctrl_sock->file); | |
958 | l2cap_conn_put(session->conn); | |
959 | kfree(session); | |
960 | } | |
961 | ||
962 | /* decrease ref-count of the given session by one */ | |
963 | static void hidp_session_put(struct hidp_session *session) | |
964 | { | |
965 | kref_put(&session->ref, session_free); | |
966 | } | |
967 | ||
968 | /* | |
969 | * Search the list of active sessions for a session with target address | |
970 | * \bdaddr. You must hold at least a read-lock on \hidp_session_sem. As long as | |
971 | * you do not release this lock, the session objects cannot vanish and you can | |
972 | * safely take a reference to the session yourself. | |
973 | */ | |
974 | static struct hidp_session *__hidp_session_find(const bdaddr_t *bdaddr) | |
975 | { | |
976 | struct hidp_session *session; | |
977 | ||
978 | list_for_each_entry(session, &hidp_session_list, list) { | |
979 | if (!bacmp(bdaddr, &session->bdaddr)) | |
980 | return session; | |
981 | } | |
982 | ||
983 | return NULL; | |
984 | } | |
985 | ||
986 | /* | |
987 | * Same as __hidp_session_find() but no locks must be held. This also takes a | |
988 | * reference of the returned session (if non-NULL) so you must drop this | |
989 | * reference if you no longer use the object. | |
990 | */ | |
991 | static struct hidp_session *hidp_session_find(const bdaddr_t *bdaddr) | |
992 | { | |
993 | struct hidp_session *session; | |
994 | ||
995 | down_read(&hidp_session_sem); | |
996 | ||
997 | session = __hidp_session_find(bdaddr); | |
998 | if (session) | |
999 | hidp_session_get(session); | |
1000 | ||
1001 | up_read(&hidp_session_sem); | |
1002 | ||
1003 | return session; | |
1004 | } | |
1005 | ||
1006 | /* | |
1007 | * Start session synchronously | |
1008 | * This starts a session thread and waits until initialization | |
1009 | * is done or returns an error if it couldn't be started. | |
1010 | * If this returns 0 the session thread is up and running. You must call | |
1011 | * hipd_session_stop_sync() before deleting any runtime resources. | |
1012 | */ | |
1013 | static int hidp_session_start_sync(struct hidp_session *session) | |
1014 | { | |
1015 | unsigned int vendor, product; | |
1016 | ||
1017 | if (session->hid) { | |
1018 | vendor = session->hid->vendor; | |
1019 | product = session->hid->product; | |
1020 | } else if (session->input) { | |
1021 | vendor = session->input->id.vendor; | |
1022 | product = session->input->id.product; | |
1023 | } else { | |
1024 | vendor = 0x0000; | |
1025 | product = 0x0000; | |
1026 | } | |
1027 | ||
1028 | session->task = kthread_run(hidp_session_thread, session, | |
1029 | "khidpd_%04x%04x", vendor, product); | |
1030 | if (IS_ERR(session->task)) | |
1031 | return PTR_ERR(session->task); | |
1032 | ||
1033 | while (atomic_read(&session->state) <= HIDP_SESSION_IDLING) | |
1034 | wait_event(session->state_queue, | |
1035 | atomic_read(&session->state) > HIDP_SESSION_IDLING); | |
1036 | ||
1037 | return 0; | |
1038 | } | |
1039 | ||
1040 | /* | |
1041 | * Terminate session thread | |
1042 | * Wake up session thread and notify it to stop. This is asynchronous and | |
1043 | * returns immediately. Call this whenever a runtime error occurs and you want | |
1044 | * the session to stop. | |
1045 | * Note: wake_up_process() performs any necessary memory-barriers for us. | |
1046 | */ | |
1047 | static void hidp_session_terminate(struct hidp_session *session) | |
1048 | { | |
1049 | atomic_inc(&session->terminate); | |
1050 | wake_up_process(session->task); | |
1051 | } | |
1052 | ||
1053 | /* | |
1054 | * Probe HIDP session | |
1055 | * This is called from the l2cap_conn core when our l2cap_user object is bound | |
1056 | * to the hci-connection. We get the session via the \user object and can now | |
1057 | * start the session thread, register the HID/input devices and link it into | |
1058 | * the global session list. | |
1059 | * The global session-list owns its own reference to the session object so you | |
1060 | * can drop your own reference after registering the l2cap_user object. | |
1061 | */ | |
1062 | static int hidp_session_probe(struct l2cap_conn *conn, | |
1063 | struct l2cap_user *user) | |
1064 | { | |
1065 | struct hidp_session *session = container_of(user, | |
1066 | struct hidp_session, | |
1067 | user); | |
1068 | struct hidp_session *s; | |
1069 | int ret; | |
1070 | ||
1071 | down_write(&hidp_session_sem); | |
1072 | ||
1073 | /* check that no other session for this device exists */ | |
1074 | s = __hidp_session_find(&session->bdaddr); | |
1075 | if (s) { | |
1076 | ret = -EEXIST; | |
1077 | goto out_unlock; | |
1078 | } | |
1079 | ||
1080 | ret = hidp_session_start_sync(session); | |
1081 | if (ret) | |
1082 | goto out_unlock; | |
1083 | ||
1084 | ret = hidp_session_dev_add(session); | |
1085 | if (ret) | |
1086 | goto out_stop; | |
1087 | ||
1088 | hidp_session_get(session); | |
1089 | list_add(&session->list, &hidp_session_list); | |
1090 | ret = 0; | |
1091 | goto out_unlock; | |
1092 | ||
1093 | out_stop: | |
1094 | hidp_session_terminate(session); | |
1095 | out_unlock: | |
1096 | up_write(&hidp_session_sem); | |
1097 | return ret; | |
1098 | } | |
1099 | ||
1100 | /* | |
1101 | * Remove HIDP session | |
1102 | * Called from the l2cap_conn core when either we explicitly unregistered | |
1103 | * the l2cap_user object or if the underlying connection is shut down. | |
1104 | * We signal the hidp-session thread to shut down, unregister the HID/input | |
1105 | * devices and unlink the session from the global list. | |
1106 | * This drops the reference to the session that is owned by the global | |
1107 | * session-list. | |
1108 | * Note: We _must_ not synchronosly wait for the session-thread to shut down. | |
1109 | * This is, because the session-thread might be waiting for an HCI lock that is | |
1110 | * held while we are called. Therefore, we only unregister the devices and | |
1111 | * notify the session-thread to terminate. The thread itself owns a reference | |
1112 | * to the session object so it can safely shut down. | |
1113 | */ | |
1114 | static void hidp_session_remove(struct l2cap_conn *conn, | |
1115 | struct l2cap_user *user) | |
1116 | { | |
1117 | struct hidp_session *session = container_of(user, | |
1118 | struct hidp_session, | |
1119 | user); | |
1120 | ||
1121 | down_write(&hidp_session_sem); | |
1122 | ||
1123 | hidp_session_terminate(session); | |
1124 | hidp_session_dev_del(session); | |
1125 | list_del(&session->list); | |
1126 | ||
1127 | up_write(&hidp_session_sem); | |
1128 | ||
1129 | hidp_session_put(session); | |
1130 | } | |
1131 | ||
1132 | /* | |
1133 | * Session Worker | |
1134 | * This performs the actual main-loop of the HIDP worker. We first check | |
1135 | * whether the underlying connection is still alive, then parse all pending | |
1136 | * messages and finally send all outstanding messages. | |
1137 | */ | |
1138 | static void hidp_session_run(struct hidp_session *session) | |
1139 | { | |
1140 | struct sock *ctrl_sk = session->ctrl_sock->sk; | |
1141 | struct sock *intr_sk = session->intr_sock->sk; | |
1142 | struct sk_buff *skb; | |
1143 | ||
1144 | for (;;) { | |
1145 | /* | |
1146 | * This thread can be woken up two ways: | |
1147 | * - You call hidp_session_terminate() which sets the | |
1148 | * session->terminate flag and wakes this thread up. | |
1149 | * - Via modifying the socket state of ctrl/intr_sock. This | |
1150 | * thread is woken up by ->sk_state_changed(). | |
1151 | * | |
1152 | * Note: set_current_state() performs any necessary | |
1153 | * memory-barriers for us. | |
1154 | */ | |
1155 | set_current_state(TASK_INTERRUPTIBLE); | |
1156 | ||
1157 | if (atomic_read(&session->terminate)) | |
1158 | break; | |
1159 | ||
1160 | if (ctrl_sk->sk_state != BT_CONNECTED || | |
1161 | intr_sk->sk_state != BT_CONNECTED) | |
1162 | break; | |
1163 | ||
1164 | /* parse incoming intr-skbs */ | |
1165 | while ((skb = skb_dequeue(&intr_sk->sk_receive_queue))) { | |
1166 | skb_orphan(skb); | |
1167 | if (!skb_linearize(skb)) | |
1168 | hidp_recv_intr_frame(session, skb); | |
1169 | else | |
1170 | kfree_skb(skb); | |
1171 | } | |
1172 | ||
1173 | /* send pending intr-skbs */ | |
7350e6cf DH |
1174 | hidp_process_transmit(session, &session->intr_transmit, |
1175 | session->intr_sock); | |
b4f34d8d DH |
1176 | |
1177 | /* parse incoming ctrl-skbs */ | |
1178 | while ((skb = skb_dequeue(&ctrl_sk->sk_receive_queue))) { | |
1179 | skb_orphan(skb); | |
1180 | if (!skb_linearize(skb)) | |
1181 | hidp_recv_ctrl_frame(session, skb); | |
1182 | else | |
1183 | kfree_skb(skb); | |
1184 | } | |
1185 | ||
1186 | /* send pending ctrl-skbs */ | |
7350e6cf DH |
1187 | hidp_process_transmit(session, &session->ctrl_transmit, |
1188 | session->ctrl_sock); | |
b4f34d8d DH |
1189 | |
1190 | schedule(); | |
1191 | } | |
1192 | ||
1193 | atomic_inc(&session->terminate); | |
1194 | set_current_state(TASK_RUNNING); | |
1195 | } | |
1196 | ||
1197 | /* | |
1198 | * HIDP session thread | |
1199 | * This thread runs the I/O for a single HIDP session. Startup is synchronous | |
1200 | * which allows us to take references to ourself here instead of doing that in | |
1201 | * the caller. | |
1202 | * When we are ready to run we notify the caller and call hidp_session_run(). | |
1203 | */ | |
1204 | static int hidp_session_thread(void *arg) | |
1205 | { | |
1206 | struct hidp_session *session = arg; | |
1207 | wait_queue_t ctrl_wait, intr_wait; | |
1208 | ||
1209 | BT_DBG("session %p", session); | |
1210 | ||
1211 | /* initialize runtime environment */ | |
1212 | hidp_session_get(session); | |
1213 | __module_get(THIS_MODULE); | |
1214 | set_user_nice(current, -15); | |
1215 | hidp_set_timer(session); | |
1216 | ||
1217 | init_waitqueue_entry(&ctrl_wait, current); | |
1218 | init_waitqueue_entry(&intr_wait, current); | |
1219 | add_wait_queue(sk_sleep(session->ctrl_sock->sk), &ctrl_wait); | |
1220 | add_wait_queue(sk_sleep(session->intr_sock->sk), &intr_wait); | |
1221 | /* This memory barrier is paired with wq_has_sleeper(). See | |
1222 | * sock_poll_wait() for more information why this is needed. */ | |
1223 | smp_mb(); | |
1224 | ||
1225 | /* notify synchronous startup that we're ready */ | |
1226 | atomic_inc(&session->state); | |
1227 | wake_up(&session->state_queue); | |
1228 | ||
1229 | /* run session */ | |
1230 | hidp_session_run(session); | |
1231 | ||
1232 | /* cleanup runtime environment */ | |
1233 | remove_wait_queue(sk_sleep(session->intr_sock->sk), &intr_wait); | |
1234 | remove_wait_queue(sk_sleep(session->intr_sock->sk), &ctrl_wait); | |
1235 | wake_up_interruptible(&session->report_queue); | |
1236 | hidp_del_timer(session); | |
1237 | ||
1238 | /* | |
1239 | * If we stopped ourself due to any internal signal, we should try to | |
1240 | * unregister our own session here to avoid having it linger until the | |
1241 | * parent l2cap_conn dies or user-space cleans it up. | |
1242 | * This does not deadlock as we don't do any synchronous shutdown. | |
1243 | * Instead, this call has the same semantics as if user-space tried to | |
1244 | * delete the session. | |
1245 | */ | |
1246 | l2cap_unregister_user(session->conn, &session->user); | |
1247 | hidp_session_put(session); | |
1248 | ||
1249 | module_put_and_exit(0); | |
1250 | return 0; | |
1251 | } | |
1252 | ||
1253 | static int hidp_verify_sockets(struct socket *ctrl_sock, | |
1254 | struct socket *intr_sock) | |
1255 | { | |
1256 | struct bt_sock *ctrl, *intr; | |
1257 | struct hidp_session *session; | |
1258 | ||
1259 | if (!l2cap_is_socket(ctrl_sock) || !l2cap_is_socket(intr_sock)) | |
1260 | return -EINVAL; | |
1261 | ||
1262 | ctrl = bt_sk(ctrl_sock->sk); | |
1263 | intr = bt_sk(intr_sock->sk); | |
1264 | ||
1265 | if (bacmp(&ctrl->src, &intr->src) || bacmp(&ctrl->dst, &intr->dst)) | |
1266 | return -ENOTUNIQ; | |
1267 | if (ctrl->sk.sk_state != BT_CONNECTED || | |
1268 | intr->sk.sk_state != BT_CONNECTED) | |
1269 | return -EBADFD; | |
1270 | ||
1271 | /* early session check, we check again during session registration */ | |
1272 | session = hidp_session_find(&ctrl->dst); | |
1273 | if (session) { | |
1274 | hidp_session_put(session); | |
1275 | return -EEXIST; | |
1276 | } | |
1277 | ||
1278 | return 0; | |
1279 | } | |
1280 | ||
1281 | int hidp_connection_add(struct hidp_connadd_req *req, | |
1282 | struct socket *ctrl_sock, | |
1283 | struct socket *intr_sock) | |
1284 | { | |
1285 | struct hidp_session *session; | |
1286 | struct l2cap_conn *conn; | |
1287 | struct l2cap_chan *chan = l2cap_pi(ctrl_sock->sk)->chan; | |
1288 | int ret; | |
1289 | ||
1290 | ret = hidp_verify_sockets(ctrl_sock, intr_sock); | |
1291 | if (ret) | |
1292 | return ret; | |
1293 | ||
1294 | conn = NULL; | |
1295 | l2cap_chan_lock(chan); | |
1296 | if (chan->conn) { | |
1297 | l2cap_conn_get(chan->conn); | |
1298 | conn = chan->conn; | |
1299 | } | |
1300 | l2cap_chan_unlock(chan); | |
1301 | ||
1302 | if (!conn) | |
1303 | return -EBADFD; | |
1304 | ||
1305 | ret = hidp_session_new(&session, &bt_sk(ctrl_sock->sk)->dst, ctrl_sock, | |
1306 | intr_sock, req, conn); | |
1307 | if (ret) | |
1308 | goto out_conn; | |
1309 | ||
1310 | ret = l2cap_register_user(conn, &session->user); | |
1311 | if (ret) | |
1312 | goto out_session; | |
1313 | ||
1314 | ret = 0; | |
1315 | ||
1316 | out_session: | |
1317 | hidp_session_put(session); | |
1318 | out_conn: | |
1319 | l2cap_conn_put(conn); | |
1320 | return ret; | |
1321 | } | |
1322 | ||
1323 | int hidp_connection_del(struct hidp_conndel_req *req) | |
1324 | { | |
1325 | struct hidp_session *session; | |
1326 | ||
1327 | session = hidp_session_find(&req->bdaddr); | |
1328 | if (!session) | |
1329 | return -ENOENT; | |
1330 | ||
1331 | if (req->flags & (1 << HIDP_VIRTUAL_CABLE_UNPLUG)) | |
1332 | hidp_send_ctrl_message(session, | |
1333 | HIDP_TRANS_HID_CONTROL | | |
1334 | HIDP_CTRL_VIRTUAL_CABLE_UNPLUG, | |
1335 | NULL, 0); | |
1336 | else | |
1337 | l2cap_unregister_user(session->conn, &session->user); | |
1338 | ||
1339 | hidp_session_put(session); | |
1340 | ||
1341 | return 0; | |
1342 | } | |
1343 | ||
1da177e4 LT |
1344 | int hidp_get_connlist(struct hidp_connlist_req *req) |
1345 | { | |
cd11cdd2 | 1346 | struct hidp_session *session; |
1da177e4 LT |
1347 | int err = 0, n = 0; |
1348 | ||
1349 | BT_DBG(""); | |
1350 | ||
1351 | down_read(&hidp_session_sem); | |
1352 | ||
cd11cdd2 | 1353 | list_for_each_entry(session, &hidp_session_list, list) { |
1da177e4 LT |
1354 | struct hidp_conninfo ci; |
1355 | ||
5205185d | 1356 | hidp_copy_session(session, &ci); |
1da177e4 LT |
1357 | |
1358 | if (copy_to_user(req->ci, &ci, sizeof(ci))) { | |
1359 | err = -EFAULT; | |
1360 | break; | |
1361 | } | |
1362 | ||
1363 | if (++n >= req->cnum) | |
1364 | break; | |
1365 | ||
1366 | req->ci++; | |
1367 | } | |
1368 | req->cnum = n; | |
1369 | ||
1370 | up_read(&hidp_session_sem); | |
1371 | return err; | |
1372 | } | |
1373 | ||
1374 | int hidp_get_conninfo(struct hidp_conninfo *ci) | |
1375 | { | |
1376 | struct hidp_session *session; | |
1da177e4 | 1377 | |
5205185d DH |
1378 | session = hidp_session_find(&ci->bdaddr); |
1379 | if (session) { | |
1380 | hidp_copy_session(session, ci); | |
1381 | hidp_session_put(session); | |
1382 | } | |
1da177e4 | 1383 | |
5205185d | 1384 | return session ? 0 : -ENOENT; |
1da177e4 LT |
1385 | } |
1386 | ||
1387 | static int __init hidp_init(void) | |
1388 | { | |
1da177e4 LT |
1389 | BT_INFO("HIDP (Human Interface Emulation) ver %s", VERSION); |
1390 | ||
8215d557 | 1391 | return hidp_init_sockets(); |
1da177e4 LT |
1392 | } |
1393 | ||
1394 | static void __exit hidp_exit(void) | |
1395 | { | |
1396 | hidp_cleanup_sockets(); | |
1397 | } | |
1398 | ||
1399 | module_init(hidp_init); | |
1400 | module_exit(hidp_exit); | |
1401 | ||
1402 | MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); | |
b4f34d8d | 1403 | MODULE_AUTHOR("David Herrmann <dh.herrmann@gmail.com>"); |
1da177e4 LT |
1404 | MODULE_DESCRIPTION("Bluetooth HIDP ver " VERSION); |
1405 | MODULE_VERSION(VERSION); | |
1406 | MODULE_LICENSE("GPL"); | |
1407 | MODULE_ALIAS("bt-proto-6"); |