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1 | /* | |
2 | HIDP implementation for Linux Bluetooth stack (BlueZ). | |
3 | Copyright (C) 2003-2004 Marcel Holtmann <marcel@holtmann.org> | |
4 | Copyright (C) 2013 David Herrmann <dh.herrmann@gmail.com> | |
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 | |
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 | |
17 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
18 | ||
19 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, | |
20 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS | |
21 | SOFTWARE IS DISCLAIMED. | |
22 | */ | |
23 | ||
24 | #include <linux/kref.h> | |
25 | #include <linux/module.h> | |
26 | #include <linux/file.h> | |
27 | #include <linux/kthread.h> | |
28 | #include <linux/hidraw.h> | |
29 | ||
30 | #include <net/bluetooth/bluetooth.h> | |
31 | #include <net/bluetooth/hci_core.h> | |
32 | #include <net/bluetooth/l2cap.h> | |
33 | ||
34 | #include "hidp.h" | |
35 | ||
36 | #define VERSION "1.2" | |
37 | ||
38 | static DECLARE_RWSEM(hidp_session_sem); | |
39 | static DECLARE_WAIT_QUEUE_HEAD(hidp_session_wq); | |
40 | static LIST_HEAD(hidp_session_list); | |
41 | ||
42 | static unsigned char hidp_keycode[256] = { | |
43 | 0, 0, 0, 0, 30, 48, 46, 32, 18, 33, 34, 35, 23, 36, | |
44 | 37, 38, 50, 49, 24, 25, 16, 19, 31, 20, 22, 47, 17, 45, | |
45 | 21, 44, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 28, 1, | |
46 | 14, 15, 57, 12, 13, 26, 27, 43, 43, 39, 40, 41, 51, 52, | |
47 | 53, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 87, 88, | |
48 | 99, 70, 119, 110, 102, 104, 111, 107, 109, 106, 105, 108, 103, 69, | |
49 | 98, 55, 74, 78, 96, 79, 80, 81, 75, 76, 77, 71, 72, 73, | |
50 | 82, 83, 86, 127, 116, 117, 183, 184, 185, 186, 187, 188, 189, 190, | |
51 | 191, 192, 193, 194, 134, 138, 130, 132, 128, 129, 131, 137, 133, 135, | |
52 | 136, 113, 115, 114, 0, 0, 0, 121, 0, 89, 93, 124, 92, 94, | |
53 | 95, 0, 0, 0, 122, 123, 90, 91, 85, 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 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
59 | 29, 42, 56, 125, 97, 54, 100, 126, 164, 166, 165, 163, 161, 115, | |
60 | 114, 113, 150, 158, 159, 128, 136, 177, 178, 176, 142, 152, 173, 140 | |
61 | }; | |
62 | ||
63 | static unsigned char hidp_mkeyspat[] = { 0x01, 0x01, 0x01, 0x01, 0x01, 0x01 }; | |
64 | ||
65 | static int hidp_session_probe(struct l2cap_conn *conn, | |
66 | struct l2cap_user *user); | |
67 | static void hidp_session_remove(struct l2cap_conn *conn, | |
68 | struct l2cap_user *user); | |
69 | static int hidp_session_thread(void *arg); | |
70 | static void hidp_session_terminate(struct hidp_session *s); | |
71 | ||
72 | static void hidp_copy_session(struct hidp_session *session, struct hidp_conninfo *ci) | |
73 | { | |
74 | u32 valid_flags = 0; | |
75 | memset(ci, 0, sizeof(*ci)); | |
76 | bacpy(&ci->bdaddr, &session->bdaddr); | |
77 | ||
78 | ci->flags = session->flags & valid_flags; | |
79 | ci->state = BT_CONNECTED; | |
80 | ||
81 | if (session->input) { | |
82 | ci->vendor = session->input->id.vendor; | |
83 | ci->product = session->input->id.product; | |
84 | ci->version = session->input->id.version; | |
85 | if (session->input->name) | |
86 | strlcpy(ci->name, session->input->name, 128); | |
87 | else | |
88 | strlcpy(ci->name, "HID Boot Device", 128); | |
89 | } else if (session->hid) { | |
90 | ci->vendor = session->hid->vendor; | |
91 | ci->product = session->hid->product; | |
92 | ci->version = session->hid->version; | |
93 | strlcpy(ci->name, session->hid->name, 128); | |
94 | } | |
95 | } | |
96 | ||
97 | /* assemble skb, queue message on @transmit and wake up the session thread */ | |
98 | static int hidp_send_message(struct hidp_session *session, struct socket *sock, | |
99 | struct sk_buff_head *transmit, unsigned char hdr, | |
100 | const unsigned char *data, int size) | |
101 | { | |
102 | struct sk_buff *skb; | |
103 | struct sock *sk = sock->sk; | |
104 | ||
105 | BT_DBG("session %p data %p size %d", session, data, size); | |
106 | ||
107 | if (atomic_read(&session->terminate)) | |
108 | return -EIO; | |
109 | ||
110 | skb = alloc_skb(size + 1, GFP_ATOMIC); | |
111 | if (!skb) { | |
112 | BT_ERR("Can't allocate memory for new frame"); | |
113 | return -ENOMEM; | |
114 | } | |
115 | ||
116 | skb_put_u8(skb, hdr); | |
117 | if (data && size > 0) | |
118 | skb_put_data(skb, data, size); | |
119 | ||
120 | skb_queue_tail(transmit, skb); | |
121 | wake_up_interruptible(sk_sleep(sk)); | |
122 | ||
123 | return 0; | |
124 | } | |
125 | ||
126 | static int hidp_send_ctrl_message(struct hidp_session *session, | |
127 | unsigned char hdr, const unsigned char *data, | |
128 | int size) | |
129 | { | |
130 | return hidp_send_message(session, session->ctrl_sock, | |
131 | &session->ctrl_transmit, hdr, data, size); | |
132 | } | |
133 | ||
134 | static int hidp_send_intr_message(struct hidp_session *session, | |
135 | unsigned char hdr, const unsigned char *data, | |
136 | int size) | |
137 | { | |
138 | return hidp_send_message(session, session->intr_sock, | |
139 | &session->intr_transmit, hdr, data, size); | |
140 | } | |
141 | ||
142 | static int hidp_input_event(struct input_dev *dev, unsigned int type, | |
143 | unsigned int code, int value) | |
144 | { | |
145 | struct hidp_session *session = input_get_drvdata(dev); | |
146 | unsigned char newleds; | |
147 | unsigned char hdr, data[2]; | |
148 | ||
149 | BT_DBG("session %p type %d code %d value %d", | |
150 | session, type, code, value); | |
151 | ||
152 | if (type != EV_LED) | |
153 | return -1; | |
154 | ||
155 | newleds = (!!test_bit(LED_KANA, dev->led) << 3) | | |
156 | (!!test_bit(LED_COMPOSE, dev->led) << 3) | | |
157 | (!!test_bit(LED_SCROLLL, dev->led) << 2) | | |
158 | (!!test_bit(LED_CAPSL, dev->led) << 1) | | |
159 | (!!test_bit(LED_NUML, dev->led) << 0); | |
160 | ||
161 | if (session->leds == newleds) | |
162 | return 0; | |
163 | ||
164 | session->leds = newleds; | |
165 | ||
166 | hdr = HIDP_TRANS_DATA | HIDP_DATA_RTYPE_OUPUT; | |
167 | data[0] = 0x01; | |
168 | data[1] = newleds; | |
169 | ||
170 | return hidp_send_intr_message(session, hdr, data, 2); | |
171 | } | |
172 | ||
173 | static void hidp_input_report(struct hidp_session *session, struct sk_buff *skb) | |
174 | { | |
175 | struct input_dev *dev = session->input; | |
176 | unsigned char *keys = session->keys; | |
177 | unsigned char *udata = skb->data + 1; | |
178 | signed char *sdata = skb->data + 1; | |
179 | int i, size = skb->len - 1; | |
180 | ||
181 | switch (skb->data[0]) { | |
182 | case 0x01: /* Keyboard report */ | |
183 | for (i = 0; i < 8; i++) | |
184 | input_report_key(dev, hidp_keycode[i + 224], (udata[0] >> i) & 1); | |
185 | ||
186 | /* If all the key codes have been set to 0x01, it means | |
187 | * too many keys were pressed at the same time. */ | |
188 | if (!memcmp(udata + 2, hidp_mkeyspat, 6)) | |
189 | break; | |
190 | ||
191 | for (i = 2; i < 8; i++) { | |
192 | if (keys[i] > 3 && memscan(udata + 2, keys[i], 6) == udata + 8) { | |
193 | if (hidp_keycode[keys[i]]) | |
194 | input_report_key(dev, hidp_keycode[keys[i]], 0); | |
195 | else | |
196 | BT_ERR("Unknown key (scancode %#x) released.", keys[i]); | |
197 | } | |
198 | ||
199 | if (udata[i] > 3 && memscan(keys + 2, udata[i], 6) == keys + 8) { | |
200 | if (hidp_keycode[udata[i]]) | |
201 | input_report_key(dev, hidp_keycode[udata[i]], 1); | |
202 | else | |
203 | BT_ERR("Unknown key (scancode %#x) pressed.", udata[i]); | |
204 | } | |
205 | } | |
206 | ||
207 | memcpy(keys, udata, 8); | |
208 | break; | |
209 | ||
210 | case 0x02: /* Mouse report */ | |
211 | input_report_key(dev, BTN_LEFT, sdata[0] & 0x01); | |
212 | input_report_key(dev, BTN_RIGHT, sdata[0] & 0x02); | |
213 | input_report_key(dev, BTN_MIDDLE, sdata[0] & 0x04); | |
214 | input_report_key(dev, BTN_SIDE, sdata[0] & 0x08); | |
215 | input_report_key(dev, BTN_EXTRA, sdata[0] & 0x10); | |
216 | ||
217 | input_report_rel(dev, REL_X, sdata[1]); | |
218 | input_report_rel(dev, REL_Y, sdata[2]); | |
219 | ||
220 | if (size > 3) | |
221 | input_report_rel(dev, REL_WHEEL, sdata[3]); | |
222 | break; | |
223 | } | |
224 | ||
225 | input_sync(dev); | |
226 | } | |
227 | ||
228 | static int hidp_get_raw_report(struct hid_device *hid, | |
229 | unsigned char report_number, | |
230 | unsigned char *data, size_t count, | |
231 | unsigned char report_type) | |
232 | { | |
233 | struct hidp_session *session = hid->driver_data; | |
234 | struct sk_buff *skb; | |
235 | size_t len; | |
236 | int numbered_reports = hid->report_enum[report_type].numbered; | |
237 | int ret; | |
238 | ||
239 | if (atomic_read(&session->terminate)) | |
240 | return -EIO; | |
241 | ||
242 | switch (report_type) { | |
243 | case HID_FEATURE_REPORT: | |
244 | report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_FEATURE; | |
245 | break; | |
246 | case HID_INPUT_REPORT: | |
247 | report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_INPUT; | |
248 | break; | |
249 | case HID_OUTPUT_REPORT: | |
250 | report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_OUPUT; | |
251 | break; | |
252 | default: | |
253 | return -EINVAL; | |
254 | } | |
255 | ||
256 | if (mutex_lock_interruptible(&session->report_mutex)) | |
257 | return -ERESTARTSYS; | |
258 | ||
259 | /* Set up our wait, and send the report request to the device. */ | |
260 | session->waiting_report_type = report_type & HIDP_DATA_RTYPE_MASK; | |
261 | session->waiting_report_number = numbered_reports ? report_number : -1; | |
262 | set_bit(HIDP_WAITING_FOR_RETURN, &session->flags); | |
263 | data[0] = report_number; | |
264 | ret = hidp_send_ctrl_message(session, report_type, data, 1); | |
265 | if (ret) | |
266 | goto err; | |
267 | ||
268 | /* Wait for the return of the report. The returned report | |
269 | gets put in session->report_return. */ | |
270 | while (test_bit(HIDP_WAITING_FOR_RETURN, &session->flags) && | |
271 | !atomic_read(&session->terminate)) { | |
272 | int res; | |
273 | ||
274 | res = wait_event_interruptible_timeout(session->report_queue, | |
275 | !test_bit(HIDP_WAITING_FOR_RETURN, &session->flags) | |
276 | || atomic_read(&session->terminate), | |
277 | 5*HZ); | |
278 | if (res == 0) { | |
279 | /* timeout */ | |
280 | ret = -EIO; | |
281 | goto err; | |
282 | } | |
283 | if (res < 0) { | |
284 | /* signal */ | |
285 | ret = -ERESTARTSYS; | |
286 | goto err; | |
287 | } | |
288 | } | |
289 | ||
290 | skb = session->report_return; | |
291 | if (skb) { | |
292 | len = skb->len < count ? skb->len : count; | |
293 | memcpy(data, skb->data, len); | |
294 | ||
295 | kfree_skb(skb); | |
296 | session->report_return = NULL; | |
297 | } else { | |
298 | /* Device returned a HANDSHAKE, indicating protocol error. */ | |
299 | len = -EIO; | |
300 | } | |
301 | ||
302 | clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags); | |
303 | mutex_unlock(&session->report_mutex); | |
304 | ||
305 | return len; | |
306 | ||
307 | err: | |
308 | clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags); | |
309 | mutex_unlock(&session->report_mutex); | |
310 | return ret; | |
311 | } | |
312 | ||
313 | static int hidp_set_raw_report(struct hid_device *hid, unsigned char reportnum, | |
314 | unsigned char *data, size_t count, | |
315 | unsigned char report_type) | |
316 | { | |
317 | struct hidp_session *session = hid->driver_data; | |
318 | int ret; | |
319 | ||
320 | switch (report_type) { | |
321 | case HID_FEATURE_REPORT: | |
322 | report_type = HIDP_TRANS_SET_REPORT | HIDP_DATA_RTYPE_FEATURE; | |
323 | break; | |
324 | case HID_INPUT_REPORT: | |
325 | report_type = HIDP_TRANS_SET_REPORT | HIDP_DATA_RTYPE_INPUT; | |
326 | break; | |
327 | case HID_OUTPUT_REPORT: | |
328 | report_type = HIDP_TRANS_SET_REPORT | HIDP_DATA_RTYPE_OUPUT; | |
329 | break; | |
330 | default: | |
331 | return -EINVAL; | |
332 | } | |
333 | ||
334 | if (mutex_lock_interruptible(&session->report_mutex)) | |
335 | return -ERESTARTSYS; | |
336 | ||
337 | /* Set up our wait, and send the report request to the device. */ | |
338 | data[0] = reportnum; | |
339 | set_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags); | |
340 | ret = hidp_send_ctrl_message(session, report_type, data, count); | |
341 | if (ret) | |
342 | goto err; | |
343 | ||
344 | /* Wait for the ACK from the device. */ | |
345 | while (test_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags) && | |
346 | !atomic_read(&session->terminate)) { | |
347 | int res; | |
348 | ||
349 | res = wait_event_interruptible_timeout(session->report_queue, | |
350 | !test_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags) | |
351 | || atomic_read(&session->terminate), | |
352 | 10*HZ); | |
353 | if (res == 0) { | |
354 | /* timeout */ | |
355 | ret = -EIO; | |
356 | goto err; | |
357 | } | |
358 | if (res < 0) { | |
359 | /* signal */ | |
360 | ret = -ERESTARTSYS; | |
361 | goto err; | |
362 | } | |
363 | } | |
364 | ||
365 | if (!session->output_report_success) { | |
366 | ret = -EIO; | |
367 | goto err; | |
368 | } | |
369 | ||
370 | ret = count; | |
371 | ||
372 | err: | |
373 | clear_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags); | |
374 | mutex_unlock(&session->report_mutex); | |
375 | return ret; | |
376 | } | |
377 | ||
378 | static int hidp_output_report(struct hid_device *hid, __u8 *data, size_t count) | |
379 | { | |
380 | struct hidp_session *session = hid->driver_data; | |
381 | ||
382 | return hidp_send_intr_message(session, | |
383 | HIDP_TRANS_DATA | HIDP_DATA_RTYPE_OUPUT, | |
384 | data, count); | |
385 | } | |
386 | ||
387 | static int hidp_raw_request(struct hid_device *hid, unsigned char reportnum, | |
388 | __u8 *buf, size_t len, unsigned char rtype, | |
389 | int reqtype) | |
390 | { | |
391 | switch (reqtype) { | |
392 | case HID_REQ_GET_REPORT: | |
393 | return hidp_get_raw_report(hid, reportnum, buf, len, rtype); | |
394 | case HID_REQ_SET_REPORT: | |
395 | return hidp_set_raw_report(hid, reportnum, buf, len, rtype); | |
396 | default: | |
397 | return -EIO; | |
398 | } | |
399 | } | |
400 | ||
401 | static void hidp_idle_timeout(unsigned long arg) | |
402 | { | |
403 | struct hidp_session *session = (struct hidp_session *) arg; | |
404 | ||
405 | /* The HIDP user-space API only contains calls to add and remove | |
406 | * devices. There is no way to forward events of any kind. Therefore, | |
407 | * we have to forcefully disconnect a device on idle-timeouts. This is | |
408 | * unfortunate and weird API design, but it is spec-compliant and | |
409 | * required for backwards-compatibility. Hence, on idle-timeout, we | |
410 | * signal driver-detach events, so poll() will be woken up with an | |
411 | * error-condition on both sockets. | |
412 | */ | |
413 | ||
414 | session->intr_sock->sk->sk_err = EUNATCH; | |
415 | session->ctrl_sock->sk->sk_err = EUNATCH; | |
416 | wake_up_interruptible(sk_sleep(session->intr_sock->sk)); | |
417 | wake_up_interruptible(sk_sleep(session->ctrl_sock->sk)); | |
418 | ||
419 | hidp_session_terminate(session); | |
420 | } | |
421 | ||
422 | static void hidp_set_timer(struct hidp_session *session) | |
423 | { | |
424 | if (session->idle_to > 0) | |
425 | mod_timer(&session->timer, jiffies + HZ * session->idle_to); | |
426 | } | |
427 | ||
428 | static void hidp_del_timer(struct hidp_session *session) | |
429 | { | |
430 | if (session->idle_to > 0) | |
431 | del_timer(&session->timer); | |
432 | } | |
433 | ||
434 | static void hidp_process_report(struct hidp_session *session, | |
435 | int type, const u8 *data, int len, int intr) | |
436 | { | |
437 | if (len > HID_MAX_BUFFER_SIZE) | |
438 | len = HID_MAX_BUFFER_SIZE; | |
439 | ||
440 | memcpy(session->input_buf, data, len); | |
441 | hid_input_report(session->hid, type, session->input_buf, len, intr); | |
442 | } | |
443 | ||
444 | static void hidp_process_handshake(struct hidp_session *session, | |
445 | unsigned char param) | |
446 | { | |
447 | BT_DBG("session %p param 0x%02x", session, param); | |
448 | session->output_report_success = 0; /* default condition */ | |
449 | ||
450 | switch (param) { | |
451 | case HIDP_HSHK_SUCCESSFUL: | |
452 | /* FIXME: Call into SET_ GET_ handlers here */ | |
453 | session->output_report_success = 1; | |
454 | break; | |
455 | ||
456 | case HIDP_HSHK_NOT_READY: | |
457 | case HIDP_HSHK_ERR_INVALID_REPORT_ID: | |
458 | case HIDP_HSHK_ERR_UNSUPPORTED_REQUEST: | |
459 | case HIDP_HSHK_ERR_INVALID_PARAMETER: | |
460 | if (test_and_clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags)) | |
461 | wake_up_interruptible(&session->report_queue); | |
462 | ||
463 | /* FIXME: Call into SET_ GET_ handlers here */ | |
464 | break; | |
465 | ||
466 | case HIDP_HSHK_ERR_UNKNOWN: | |
467 | break; | |
468 | ||
469 | case HIDP_HSHK_ERR_FATAL: | |
470 | /* Device requests a reboot, as this is the only way this error | |
471 | * can be recovered. */ | |
472 | hidp_send_ctrl_message(session, | |
473 | HIDP_TRANS_HID_CONTROL | HIDP_CTRL_SOFT_RESET, NULL, 0); | |
474 | break; | |
475 | ||
476 | default: | |
477 | hidp_send_ctrl_message(session, | |
478 | HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_INVALID_PARAMETER, NULL, 0); | |
479 | break; | |
480 | } | |
481 | ||
482 | /* Wake up the waiting thread. */ | |
483 | if (test_and_clear_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags)) | |
484 | wake_up_interruptible(&session->report_queue); | |
485 | } | |
486 | ||
487 | static void hidp_process_hid_control(struct hidp_session *session, | |
488 | unsigned char param) | |
489 | { | |
490 | BT_DBG("session %p param 0x%02x", session, param); | |
491 | ||
492 | if (param == HIDP_CTRL_VIRTUAL_CABLE_UNPLUG) { | |
493 | /* Flush the transmit queues */ | |
494 | skb_queue_purge(&session->ctrl_transmit); | |
495 | skb_queue_purge(&session->intr_transmit); | |
496 | ||
497 | hidp_session_terminate(session); | |
498 | } | |
499 | } | |
500 | ||
501 | /* Returns true if the passed-in skb should be freed by the caller. */ | |
502 | static int hidp_process_data(struct hidp_session *session, struct sk_buff *skb, | |
503 | unsigned char param) | |
504 | { | |
505 | int done_with_skb = 1; | |
506 | BT_DBG("session %p skb %p len %d param 0x%02x", session, skb, skb->len, param); | |
507 | ||
508 | switch (param) { | |
509 | case HIDP_DATA_RTYPE_INPUT: | |
510 | hidp_set_timer(session); | |
511 | ||
512 | if (session->input) | |
513 | hidp_input_report(session, skb); | |
514 | ||
515 | if (session->hid) | |
516 | hidp_process_report(session, HID_INPUT_REPORT, | |
517 | skb->data, skb->len, 0); | |
518 | break; | |
519 | ||
520 | case HIDP_DATA_RTYPE_OTHER: | |
521 | case HIDP_DATA_RTYPE_OUPUT: | |
522 | case HIDP_DATA_RTYPE_FEATURE: | |
523 | break; | |
524 | ||
525 | default: | |
526 | hidp_send_ctrl_message(session, | |
527 | HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_INVALID_PARAMETER, NULL, 0); | |
528 | } | |
529 | ||
530 | if (test_bit(HIDP_WAITING_FOR_RETURN, &session->flags) && | |
531 | param == session->waiting_report_type) { | |
532 | if (session->waiting_report_number < 0 || | |
533 | session->waiting_report_number == skb->data[0]) { | |
534 | /* hidp_get_raw_report() is waiting on this report. */ | |
535 | session->report_return = skb; | |
536 | done_with_skb = 0; | |
537 | clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags); | |
538 | wake_up_interruptible(&session->report_queue); | |
539 | } | |
540 | } | |
541 | ||
542 | return done_with_skb; | |
543 | } | |
544 | ||
545 | static void hidp_recv_ctrl_frame(struct hidp_session *session, | |
546 | struct sk_buff *skb) | |
547 | { | |
548 | unsigned char hdr, type, param; | |
549 | int free_skb = 1; | |
550 | ||
551 | BT_DBG("session %p skb %p len %d", session, skb, skb->len); | |
552 | ||
553 | hdr = skb->data[0]; | |
554 | skb_pull(skb, 1); | |
555 | ||
556 | type = hdr & HIDP_HEADER_TRANS_MASK; | |
557 | param = hdr & HIDP_HEADER_PARAM_MASK; | |
558 | ||
559 | switch (type) { | |
560 | case HIDP_TRANS_HANDSHAKE: | |
561 | hidp_process_handshake(session, param); | |
562 | break; | |
563 | ||
564 | case HIDP_TRANS_HID_CONTROL: | |
565 | hidp_process_hid_control(session, param); | |
566 | break; | |
567 | ||
568 | case HIDP_TRANS_DATA: | |
569 | free_skb = hidp_process_data(session, skb, param); | |
570 | break; | |
571 | ||
572 | default: | |
573 | hidp_send_ctrl_message(session, | |
574 | HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_UNSUPPORTED_REQUEST, NULL, 0); | |
575 | break; | |
576 | } | |
577 | ||
578 | if (free_skb) | |
579 | kfree_skb(skb); | |
580 | } | |
581 | ||
582 | static void hidp_recv_intr_frame(struct hidp_session *session, | |
583 | struct sk_buff *skb) | |
584 | { | |
585 | unsigned char hdr; | |
586 | ||
587 | BT_DBG("session %p skb %p len %d", session, skb, skb->len); | |
588 | ||
589 | hdr = skb->data[0]; | |
590 | skb_pull(skb, 1); | |
591 | ||
592 | if (hdr == (HIDP_TRANS_DATA | HIDP_DATA_RTYPE_INPUT)) { | |
593 | hidp_set_timer(session); | |
594 | ||
595 | if (session->input) | |
596 | hidp_input_report(session, skb); | |
597 | ||
598 | if (session->hid) { | |
599 | hidp_process_report(session, HID_INPUT_REPORT, | |
600 | skb->data, skb->len, 1); | |
601 | BT_DBG("report len %d", skb->len); | |
602 | } | |
603 | } else { | |
604 | BT_DBG("Unsupported protocol header 0x%02x", hdr); | |
605 | } | |
606 | ||
607 | kfree_skb(skb); | |
608 | } | |
609 | ||
610 | static int hidp_send_frame(struct socket *sock, unsigned char *data, int len) | |
611 | { | |
612 | struct kvec iv = { data, len }; | |
613 | struct msghdr msg; | |
614 | ||
615 | BT_DBG("sock %p data %p len %d", sock, data, len); | |
616 | ||
617 | if (!len) | |
618 | return 0; | |
619 | ||
620 | memset(&msg, 0, sizeof(msg)); | |
621 | ||
622 | return kernel_sendmsg(sock, &msg, &iv, 1, len); | |
623 | } | |
624 | ||
625 | /* dequeue message from @transmit and send via @sock */ | |
626 | static void hidp_process_transmit(struct hidp_session *session, | |
627 | struct sk_buff_head *transmit, | |
628 | struct socket *sock) | |
629 | { | |
630 | struct sk_buff *skb; | |
631 | int ret; | |
632 | ||
633 | BT_DBG("session %p", session); | |
634 | ||
635 | while ((skb = skb_dequeue(transmit))) { | |
636 | ret = hidp_send_frame(sock, skb->data, skb->len); | |
637 | if (ret == -EAGAIN) { | |
638 | skb_queue_head(transmit, skb); | |
639 | break; | |
640 | } else if (ret < 0) { | |
641 | hidp_session_terminate(session); | |
642 | kfree_skb(skb); | |
643 | break; | |
644 | } | |
645 | ||
646 | hidp_set_timer(session); | |
647 | kfree_skb(skb); | |
648 | } | |
649 | } | |
650 | ||
651 | static int hidp_setup_input(struct hidp_session *session, | |
652 | struct hidp_connadd_req *req) | |
653 | { | |
654 | struct input_dev *input; | |
655 | int i; | |
656 | ||
657 | input = input_allocate_device(); | |
658 | if (!input) | |
659 | return -ENOMEM; | |
660 | ||
661 | session->input = input; | |
662 | ||
663 | input_set_drvdata(input, session); | |
664 | ||
665 | input->name = "Bluetooth HID Boot Protocol Device"; | |
666 | ||
667 | input->id.bustype = BUS_BLUETOOTH; | |
668 | input->id.vendor = req->vendor; | |
669 | input->id.product = req->product; | |
670 | input->id.version = req->version; | |
671 | ||
672 | if (req->subclass & 0x40) { | |
673 | set_bit(EV_KEY, input->evbit); | |
674 | set_bit(EV_LED, input->evbit); | |
675 | set_bit(EV_REP, input->evbit); | |
676 | ||
677 | set_bit(LED_NUML, input->ledbit); | |
678 | set_bit(LED_CAPSL, input->ledbit); | |
679 | set_bit(LED_SCROLLL, input->ledbit); | |
680 | set_bit(LED_COMPOSE, input->ledbit); | |
681 | set_bit(LED_KANA, input->ledbit); | |
682 | ||
683 | for (i = 0; i < sizeof(hidp_keycode); i++) | |
684 | set_bit(hidp_keycode[i], input->keybit); | |
685 | clear_bit(0, input->keybit); | |
686 | } | |
687 | ||
688 | if (req->subclass & 0x80) { | |
689 | input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL); | |
690 | input->keybit[BIT_WORD(BTN_MOUSE)] = BIT_MASK(BTN_LEFT) | | |
691 | BIT_MASK(BTN_RIGHT) | BIT_MASK(BTN_MIDDLE); | |
692 | input->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y); | |
693 | input->keybit[BIT_WORD(BTN_MOUSE)] |= BIT_MASK(BTN_SIDE) | | |
694 | BIT_MASK(BTN_EXTRA); | |
695 | input->relbit[0] |= BIT_MASK(REL_WHEEL); | |
696 | } | |
697 | ||
698 | input->dev.parent = &session->conn->hcon->dev; | |
699 | ||
700 | input->event = hidp_input_event; | |
701 | ||
702 | return 0; | |
703 | } | |
704 | ||
705 | static int hidp_open(struct hid_device *hid) | |
706 | { | |
707 | return 0; | |
708 | } | |
709 | ||
710 | static void hidp_close(struct hid_device *hid) | |
711 | { | |
712 | } | |
713 | ||
714 | static int hidp_parse(struct hid_device *hid) | |
715 | { | |
716 | struct hidp_session *session = hid->driver_data; | |
717 | ||
718 | return hid_parse_report(session->hid, session->rd_data, | |
719 | session->rd_size); | |
720 | } | |
721 | ||
722 | static int hidp_start(struct hid_device *hid) | |
723 | { | |
724 | return 0; | |
725 | } | |
726 | ||
727 | static void hidp_stop(struct hid_device *hid) | |
728 | { | |
729 | struct hidp_session *session = hid->driver_data; | |
730 | ||
731 | skb_queue_purge(&session->ctrl_transmit); | |
732 | skb_queue_purge(&session->intr_transmit); | |
733 | ||
734 | hid->claimed = 0; | |
735 | } | |
736 | ||
737 | static struct hid_ll_driver hidp_hid_driver = { | |
738 | .parse = hidp_parse, | |
739 | .start = hidp_start, | |
740 | .stop = hidp_stop, | |
741 | .open = hidp_open, | |
742 | .close = hidp_close, | |
743 | .raw_request = hidp_raw_request, | |
744 | .output_report = hidp_output_report, | |
745 | }; | |
746 | ||
747 | /* This function sets up the hid device. It does not add it | |
748 | to the HID system. That is done in hidp_add_connection(). */ | |
749 | static int hidp_setup_hid(struct hidp_session *session, | |
750 | struct hidp_connadd_req *req) | |
751 | { | |
752 | struct hid_device *hid; | |
753 | int err; | |
754 | ||
755 | session->rd_data = memdup_user(req->rd_data, req->rd_size); | |
756 | if (IS_ERR(session->rd_data)) | |
757 | return PTR_ERR(session->rd_data); | |
758 | ||
759 | session->rd_size = req->rd_size; | |
760 | ||
761 | hid = hid_allocate_device(); | |
762 | if (IS_ERR(hid)) { | |
763 | err = PTR_ERR(hid); | |
764 | goto fault; | |
765 | } | |
766 | ||
767 | session->hid = hid; | |
768 | ||
769 | hid->driver_data = session; | |
770 | ||
771 | hid->bus = BUS_BLUETOOTH; | |
772 | hid->vendor = req->vendor; | |
773 | hid->product = req->product; | |
774 | hid->version = req->version; | |
775 | hid->country = req->country; | |
776 | ||
777 | strncpy(hid->name, req->name, sizeof(req->name) - 1); | |
778 | ||
779 | snprintf(hid->phys, sizeof(hid->phys), "%pMR", | |
780 | &l2cap_pi(session->ctrl_sock->sk)->chan->src); | |
781 | ||
782 | /* NOTE: Some device modules depend on the dst address being stored in | |
783 | * uniq. Please be aware of this before making changes to this behavior. | |
784 | */ | |
785 | snprintf(hid->uniq, sizeof(hid->uniq), "%pMR", | |
786 | &l2cap_pi(session->ctrl_sock->sk)->chan->dst); | |
787 | ||
788 | hid->dev.parent = &session->conn->hcon->dev; | |
789 | hid->ll_driver = &hidp_hid_driver; | |
790 | ||
791 | /* True if device is blacklisted in drivers/hid/hid-core.c */ | |
792 | if (hid_ignore(hid)) { | |
793 | hid_destroy_device(session->hid); | |
794 | session->hid = NULL; | |
795 | return -ENODEV; | |
796 | } | |
797 | ||
798 | return 0; | |
799 | ||
800 | fault: | |
801 | kfree(session->rd_data); | |
802 | session->rd_data = NULL; | |
803 | ||
804 | return err; | |
805 | } | |
806 | ||
807 | /* initialize session devices */ | |
808 | static int hidp_session_dev_init(struct hidp_session *session, | |
809 | struct hidp_connadd_req *req) | |
810 | { | |
811 | int ret; | |
812 | ||
813 | if (req->rd_size > 0) { | |
814 | ret = hidp_setup_hid(session, req); | |
815 | if (ret && ret != -ENODEV) | |
816 | return ret; | |
817 | } | |
818 | ||
819 | if (!session->hid) { | |
820 | ret = hidp_setup_input(session, req); | |
821 | if (ret < 0) | |
822 | return ret; | |
823 | } | |
824 | ||
825 | return 0; | |
826 | } | |
827 | ||
828 | /* destroy session devices */ | |
829 | static void hidp_session_dev_destroy(struct hidp_session *session) | |
830 | { | |
831 | if (session->hid) | |
832 | put_device(&session->hid->dev); | |
833 | else if (session->input) | |
834 | input_put_device(session->input); | |
835 | ||
836 | kfree(session->rd_data); | |
837 | session->rd_data = NULL; | |
838 | } | |
839 | ||
840 | /* add HID/input devices to their underlying bus systems */ | |
841 | static int hidp_session_dev_add(struct hidp_session *session) | |
842 | { | |
843 | int ret; | |
844 | ||
845 | /* Both HID and input systems drop a ref-count when unregistering the | |
846 | * device but they don't take a ref-count when registering them. Work | |
847 | * around this by explicitly taking a refcount during registration | |
848 | * which is dropped automatically by unregistering the devices. */ | |
849 | ||
850 | if (session->hid) { | |
851 | ret = hid_add_device(session->hid); | |
852 | if (ret) | |
853 | return ret; | |
854 | get_device(&session->hid->dev); | |
855 | } else if (session->input) { | |
856 | ret = input_register_device(session->input); | |
857 | if (ret) | |
858 | return ret; | |
859 | input_get_device(session->input); | |
860 | } | |
861 | ||
862 | return 0; | |
863 | } | |
864 | ||
865 | /* remove HID/input devices from their bus systems */ | |
866 | static void hidp_session_dev_del(struct hidp_session *session) | |
867 | { | |
868 | if (session->hid) | |
869 | hid_destroy_device(session->hid); | |
870 | else if (session->input) | |
871 | input_unregister_device(session->input); | |
872 | } | |
873 | ||
874 | /* | |
875 | * Asynchronous device registration | |
876 | * HID device drivers might want to perform I/O during initialization to | |
877 | * detect device types. Therefore, call device registration in a separate | |
878 | * worker so the HIDP thread can schedule I/O operations. | |
879 | * Note that this must be called after the worker thread was initialized | |
880 | * successfully. This will then add the devices and increase session state | |
881 | * on success, otherwise it will terminate the session thread. | |
882 | */ | |
883 | static void hidp_session_dev_work(struct work_struct *work) | |
884 | { | |
885 | struct hidp_session *session = container_of(work, | |
886 | struct hidp_session, | |
887 | dev_init); | |
888 | int ret; | |
889 | ||
890 | ret = hidp_session_dev_add(session); | |
891 | if (!ret) | |
892 | atomic_inc(&session->state); | |
893 | else | |
894 | hidp_session_terminate(session); | |
895 | } | |
896 | ||
897 | /* | |
898 | * Create new session object | |
899 | * Allocate session object, initialize static fields, copy input data into the | |
900 | * object and take a reference to all sub-objects. | |
901 | * This returns 0 on success and puts a pointer to the new session object in | |
902 | * \out. Otherwise, an error code is returned. | |
903 | * The new session object has an initial ref-count of 1. | |
904 | */ | |
905 | static int hidp_session_new(struct hidp_session **out, const bdaddr_t *bdaddr, | |
906 | struct socket *ctrl_sock, | |
907 | struct socket *intr_sock, | |
908 | struct hidp_connadd_req *req, | |
909 | struct l2cap_conn *conn) | |
910 | { | |
911 | struct hidp_session *session; | |
912 | int ret; | |
913 | struct bt_sock *ctrl, *intr; | |
914 | ||
915 | ctrl = bt_sk(ctrl_sock->sk); | |
916 | intr = bt_sk(intr_sock->sk); | |
917 | ||
918 | session = kzalloc(sizeof(*session), GFP_KERNEL); | |
919 | if (!session) | |
920 | return -ENOMEM; | |
921 | ||
922 | /* object and runtime management */ | |
923 | kref_init(&session->ref); | |
924 | atomic_set(&session->state, HIDP_SESSION_IDLING); | |
925 | init_waitqueue_head(&session->state_queue); | |
926 | session->flags = req->flags & BIT(HIDP_BLUETOOTH_VENDOR_ID); | |
927 | ||
928 | /* connection management */ | |
929 | bacpy(&session->bdaddr, bdaddr); | |
930 | session->conn = l2cap_conn_get(conn); | |
931 | session->user.probe = hidp_session_probe; | |
932 | session->user.remove = hidp_session_remove; | |
933 | INIT_LIST_HEAD(&session->user.list); | |
934 | session->ctrl_sock = ctrl_sock; | |
935 | session->intr_sock = intr_sock; | |
936 | skb_queue_head_init(&session->ctrl_transmit); | |
937 | skb_queue_head_init(&session->intr_transmit); | |
938 | session->ctrl_mtu = min_t(uint, l2cap_pi(ctrl)->chan->omtu, | |
939 | l2cap_pi(ctrl)->chan->imtu); | |
940 | session->intr_mtu = min_t(uint, l2cap_pi(intr)->chan->omtu, | |
941 | l2cap_pi(intr)->chan->imtu); | |
942 | session->idle_to = req->idle_to; | |
943 | ||
944 | /* device management */ | |
945 | INIT_WORK(&session->dev_init, hidp_session_dev_work); | |
946 | setup_timer(&session->timer, hidp_idle_timeout, | |
947 | (unsigned long)session); | |
948 | ||
949 | /* session data */ | |
950 | mutex_init(&session->report_mutex); | |
951 | init_waitqueue_head(&session->report_queue); | |
952 | ||
953 | ret = hidp_session_dev_init(session, req); | |
954 | if (ret) | |
955 | goto err_free; | |
956 | ||
957 | get_file(session->intr_sock->file); | |
958 | get_file(session->ctrl_sock->file); | |
959 | *out = session; | |
960 | return 0; | |
961 | ||
962 | err_free: | |
963 | l2cap_conn_put(session->conn); | |
964 | kfree(session); | |
965 | return ret; | |
966 | } | |
967 | ||
968 | /* increase ref-count of the given session by one */ | |
969 | static void hidp_session_get(struct hidp_session *session) | |
970 | { | |
971 | kref_get(&session->ref); | |
972 | } | |
973 | ||
974 | /* release callback */ | |
975 | static void session_free(struct kref *ref) | |
976 | { | |
977 | struct hidp_session *session = container_of(ref, struct hidp_session, | |
978 | ref); | |
979 | ||
980 | hidp_session_dev_destroy(session); | |
981 | skb_queue_purge(&session->ctrl_transmit); | |
982 | skb_queue_purge(&session->intr_transmit); | |
983 | fput(session->intr_sock->file); | |
984 | fput(session->ctrl_sock->file); | |
985 | l2cap_conn_put(session->conn); | |
986 | kfree(session); | |
987 | } | |
988 | ||
989 | /* decrease ref-count of the given session by one */ | |
990 | static void hidp_session_put(struct hidp_session *session) | |
991 | { | |
992 | kref_put(&session->ref, session_free); | |
993 | } | |
994 | ||
995 | /* | |
996 | * Search the list of active sessions for a session with target address | |
997 | * \bdaddr. You must hold at least a read-lock on \hidp_session_sem. As long as | |
998 | * you do not release this lock, the session objects cannot vanish and you can | |
999 | * safely take a reference to the session yourself. | |
1000 | */ | |
1001 | static struct hidp_session *__hidp_session_find(const bdaddr_t *bdaddr) | |
1002 | { | |
1003 | struct hidp_session *session; | |
1004 | ||
1005 | list_for_each_entry(session, &hidp_session_list, list) { | |
1006 | if (!bacmp(bdaddr, &session->bdaddr)) | |
1007 | return session; | |
1008 | } | |
1009 | ||
1010 | return NULL; | |
1011 | } | |
1012 | ||
1013 | /* | |
1014 | * Same as __hidp_session_find() but no locks must be held. This also takes a | |
1015 | * reference of the returned session (if non-NULL) so you must drop this | |
1016 | * reference if you no longer use the object. | |
1017 | */ | |
1018 | static struct hidp_session *hidp_session_find(const bdaddr_t *bdaddr) | |
1019 | { | |
1020 | struct hidp_session *session; | |
1021 | ||
1022 | down_read(&hidp_session_sem); | |
1023 | ||
1024 | session = __hidp_session_find(bdaddr); | |
1025 | if (session) | |
1026 | hidp_session_get(session); | |
1027 | ||
1028 | up_read(&hidp_session_sem); | |
1029 | ||
1030 | return session; | |
1031 | } | |
1032 | ||
1033 | /* | |
1034 | * Start session synchronously | |
1035 | * This starts a session thread and waits until initialization | |
1036 | * is done or returns an error if it couldn't be started. | |
1037 | * If this returns 0 the session thread is up and running. You must call | |
1038 | * hipd_session_stop_sync() before deleting any runtime resources. | |
1039 | */ | |
1040 | static int hidp_session_start_sync(struct hidp_session *session) | |
1041 | { | |
1042 | unsigned int vendor, product; | |
1043 | ||
1044 | if (session->hid) { | |
1045 | vendor = session->hid->vendor; | |
1046 | product = session->hid->product; | |
1047 | } else if (session->input) { | |
1048 | vendor = session->input->id.vendor; | |
1049 | product = session->input->id.product; | |
1050 | } else { | |
1051 | vendor = 0x0000; | |
1052 | product = 0x0000; | |
1053 | } | |
1054 | ||
1055 | session->task = kthread_run(hidp_session_thread, session, | |
1056 | "khidpd_%04x%04x", vendor, product); | |
1057 | if (IS_ERR(session->task)) | |
1058 | return PTR_ERR(session->task); | |
1059 | ||
1060 | while (atomic_read(&session->state) <= HIDP_SESSION_IDLING) | |
1061 | wait_event(session->state_queue, | |
1062 | atomic_read(&session->state) > HIDP_SESSION_IDLING); | |
1063 | ||
1064 | return 0; | |
1065 | } | |
1066 | ||
1067 | /* | |
1068 | * Terminate session thread | |
1069 | * Wake up session thread and notify it to stop. This is asynchronous and | |
1070 | * returns immediately. Call this whenever a runtime error occurs and you want | |
1071 | * the session to stop. | |
1072 | * Note: wake_up_interruptible() performs any necessary memory-barriers for us. | |
1073 | */ | |
1074 | static void hidp_session_terminate(struct hidp_session *session) | |
1075 | { | |
1076 | atomic_inc(&session->terminate); | |
1077 | wake_up_interruptible(&hidp_session_wq); | |
1078 | } | |
1079 | ||
1080 | /* | |
1081 | * Probe HIDP session | |
1082 | * This is called from the l2cap_conn core when our l2cap_user object is bound | |
1083 | * to the hci-connection. We get the session via the \user object and can now | |
1084 | * start the session thread, link it into the global session list and | |
1085 | * schedule HID/input device registration. | |
1086 | * The global session-list owns its own reference to the session object so you | |
1087 | * can drop your own reference after registering the l2cap_user object. | |
1088 | */ | |
1089 | static int hidp_session_probe(struct l2cap_conn *conn, | |
1090 | struct l2cap_user *user) | |
1091 | { | |
1092 | struct hidp_session *session = container_of(user, | |
1093 | struct hidp_session, | |
1094 | user); | |
1095 | struct hidp_session *s; | |
1096 | int ret; | |
1097 | ||
1098 | down_write(&hidp_session_sem); | |
1099 | ||
1100 | /* check that no other session for this device exists */ | |
1101 | s = __hidp_session_find(&session->bdaddr); | |
1102 | if (s) { | |
1103 | ret = -EEXIST; | |
1104 | goto out_unlock; | |
1105 | } | |
1106 | ||
1107 | if (session->input) { | |
1108 | ret = hidp_session_dev_add(session); | |
1109 | if (ret) | |
1110 | goto out_unlock; | |
1111 | } | |
1112 | ||
1113 | ret = hidp_session_start_sync(session); | |
1114 | if (ret) | |
1115 | goto out_del; | |
1116 | ||
1117 | /* HID device registration is async to allow I/O during probe */ | |
1118 | if (session->input) | |
1119 | atomic_inc(&session->state); | |
1120 | else | |
1121 | schedule_work(&session->dev_init); | |
1122 | ||
1123 | hidp_session_get(session); | |
1124 | list_add(&session->list, &hidp_session_list); | |
1125 | ret = 0; | |
1126 | goto out_unlock; | |
1127 | ||
1128 | out_del: | |
1129 | if (session->input) | |
1130 | hidp_session_dev_del(session); | |
1131 | out_unlock: | |
1132 | up_write(&hidp_session_sem); | |
1133 | return ret; | |
1134 | } | |
1135 | ||
1136 | /* | |
1137 | * Remove HIDP session | |
1138 | * Called from the l2cap_conn core when either we explicitly unregistered | |
1139 | * the l2cap_user object or if the underlying connection is shut down. | |
1140 | * We signal the hidp-session thread to shut down, unregister the HID/input | |
1141 | * devices and unlink the session from the global list. | |
1142 | * This drops the reference to the session that is owned by the global | |
1143 | * session-list. | |
1144 | * Note: We _must_ not synchronosly wait for the session-thread to shut down. | |
1145 | * This is, because the session-thread might be waiting for an HCI lock that is | |
1146 | * held while we are called. Therefore, we only unregister the devices and | |
1147 | * notify the session-thread to terminate. The thread itself owns a reference | |
1148 | * to the session object so it can safely shut down. | |
1149 | */ | |
1150 | static void hidp_session_remove(struct l2cap_conn *conn, | |
1151 | struct l2cap_user *user) | |
1152 | { | |
1153 | struct hidp_session *session = container_of(user, | |
1154 | struct hidp_session, | |
1155 | user); | |
1156 | ||
1157 | down_write(&hidp_session_sem); | |
1158 | ||
1159 | hidp_session_terminate(session); | |
1160 | ||
1161 | cancel_work_sync(&session->dev_init); | |
1162 | if (session->input || | |
1163 | atomic_read(&session->state) > HIDP_SESSION_PREPARING) | |
1164 | hidp_session_dev_del(session); | |
1165 | ||
1166 | list_del(&session->list); | |
1167 | ||
1168 | up_write(&hidp_session_sem); | |
1169 | ||
1170 | hidp_session_put(session); | |
1171 | } | |
1172 | ||
1173 | /* | |
1174 | * Session Worker | |
1175 | * This performs the actual main-loop of the HIDP worker. We first check | |
1176 | * whether the underlying connection is still alive, then parse all pending | |
1177 | * messages and finally send all outstanding messages. | |
1178 | */ | |
1179 | static void hidp_session_run(struct hidp_session *session) | |
1180 | { | |
1181 | struct sock *ctrl_sk = session->ctrl_sock->sk; | |
1182 | struct sock *intr_sk = session->intr_sock->sk; | |
1183 | struct sk_buff *skb; | |
1184 | DEFINE_WAIT_FUNC(wait, woken_wake_function); | |
1185 | ||
1186 | add_wait_queue(&hidp_session_wq, &wait); | |
1187 | for (;;) { | |
1188 | /* | |
1189 | * This thread can be woken up two ways: | |
1190 | * - You call hidp_session_terminate() which sets the | |
1191 | * session->terminate flag and wakes this thread up. | |
1192 | * - Via modifying the socket state of ctrl/intr_sock. This | |
1193 | * thread is woken up by ->sk_state_changed(). | |
1194 | */ | |
1195 | ||
1196 | /* Ensure session->terminate is updated */ | |
1197 | smp_mb__before_atomic(); | |
1198 | if (atomic_read(&session->terminate)) | |
1199 | break; | |
1200 | ||
1201 | if (ctrl_sk->sk_state != BT_CONNECTED || | |
1202 | intr_sk->sk_state != BT_CONNECTED) | |
1203 | break; | |
1204 | ||
1205 | /* parse incoming intr-skbs */ | |
1206 | while ((skb = skb_dequeue(&intr_sk->sk_receive_queue))) { | |
1207 | skb_orphan(skb); | |
1208 | if (!skb_linearize(skb)) | |
1209 | hidp_recv_intr_frame(session, skb); | |
1210 | else | |
1211 | kfree_skb(skb); | |
1212 | } | |
1213 | ||
1214 | /* send pending intr-skbs */ | |
1215 | hidp_process_transmit(session, &session->intr_transmit, | |
1216 | session->intr_sock); | |
1217 | ||
1218 | /* parse incoming ctrl-skbs */ | |
1219 | while ((skb = skb_dequeue(&ctrl_sk->sk_receive_queue))) { | |
1220 | skb_orphan(skb); | |
1221 | if (!skb_linearize(skb)) | |
1222 | hidp_recv_ctrl_frame(session, skb); | |
1223 | else | |
1224 | kfree_skb(skb); | |
1225 | } | |
1226 | ||
1227 | /* send pending ctrl-skbs */ | |
1228 | hidp_process_transmit(session, &session->ctrl_transmit, | |
1229 | session->ctrl_sock); | |
1230 | ||
1231 | wait_woken(&wait, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT); | |
1232 | } | |
1233 | remove_wait_queue(&hidp_session_wq, &wait); | |
1234 | ||
1235 | atomic_inc(&session->terminate); | |
1236 | ||
1237 | /* Ensure session->terminate is updated */ | |
1238 | smp_mb__after_atomic(); | |
1239 | } | |
1240 | ||
1241 | static int hidp_session_wake_function(wait_queue_entry_t *wait, | |
1242 | unsigned int mode, | |
1243 | int sync, void *key) | |
1244 | { | |
1245 | wake_up_interruptible(&hidp_session_wq); | |
1246 | return false; | |
1247 | } | |
1248 | ||
1249 | /* | |
1250 | * HIDP session thread | |
1251 | * This thread runs the I/O for a single HIDP session. Startup is synchronous | |
1252 | * which allows us to take references to ourself here instead of doing that in | |
1253 | * the caller. | |
1254 | * When we are ready to run we notify the caller and call hidp_session_run(). | |
1255 | */ | |
1256 | static int hidp_session_thread(void *arg) | |
1257 | { | |
1258 | struct hidp_session *session = arg; | |
1259 | DEFINE_WAIT_FUNC(ctrl_wait, hidp_session_wake_function); | |
1260 | DEFINE_WAIT_FUNC(intr_wait, hidp_session_wake_function); | |
1261 | ||
1262 | BT_DBG("session %p", session); | |
1263 | ||
1264 | /* initialize runtime environment */ | |
1265 | hidp_session_get(session); | |
1266 | __module_get(THIS_MODULE); | |
1267 | set_user_nice(current, -15); | |
1268 | hidp_set_timer(session); | |
1269 | ||
1270 | add_wait_queue(sk_sleep(session->ctrl_sock->sk), &ctrl_wait); | |
1271 | add_wait_queue(sk_sleep(session->intr_sock->sk), &intr_wait); | |
1272 | /* This memory barrier is paired with wq_has_sleeper(). See | |
1273 | * sock_poll_wait() for more information why this is needed. */ | |
1274 | smp_mb(); | |
1275 | ||
1276 | /* notify synchronous startup that we're ready */ | |
1277 | atomic_inc(&session->state); | |
1278 | wake_up(&session->state_queue); | |
1279 | ||
1280 | /* run session */ | |
1281 | hidp_session_run(session); | |
1282 | ||
1283 | /* cleanup runtime environment */ | |
1284 | remove_wait_queue(sk_sleep(session->intr_sock->sk), &intr_wait); | |
1285 | remove_wait_queue(sk_sleep(session->intr_sock->sk), &ctrl_wait); | |
1286 | wake_up_interruptible(&session->report_queue); | |
1287 | hidp_del_timer(session); | |
1288 | ||
1289 | /* | |
1290 | * If we stopped ourself due to any internal signal, we should try to | |
1291 | * unregister our own session here to avoid having it linger until the | |
1292 | * parent l2cap_conn dies or user-space cleans it up. | |
1293 | * This does not deadlock as we don't do any synchronous shutdown. | |
1294 | * Instead, this call has the same semantics as if user-space tried to | |
1295 | * delete the session. | |
1296 | */ | |
1297 | l2cap_unregister_user(session->conn, &session->user); | |
1298 | hidp_session_put(session); | |
1299 | ||
1300 | module_put_and_exit(0); | |
1301 | return 0; | |
1302 | } | |
1303 | ||
1304 | static int hidp_verify_sockets(struct socket *ctrl_sock, | |
1305 | struct socket *intr_sock) | |
1306 | { | |
1307 | struct l2cap_chan *ctrl_chan, *intr_chan; | |
1308 | struct bt_sock *ctrl, *intr; | |
1309 | struct hidp_session *session; | |
1310 | ||
1311 | if (!l2cap_is_socket(ctrl_sock) || !l2cap_is_socket(intr_sock)) | |
1312 | return -EINVAL; | |
1313 | ||
1314 | ctrl_chan = l2cap_pi(ctrl_sock->sk)->chan; | |
1315 | intr_chan = l2cap_pi(intr_sock->sk)->chan; | |
1316 | ||
1317 | if (bacmp(&ctrl_chan->src, &intr_chan->src) || | |
1318 | bacmp(&ctrl_chan->dst, &intr_chan->dst)) | |
1319 | return -ENOTUNIQ; | |
1320 | ||
1321 | ctrl = bt_sk(ctrl_sock->sk); | |
1322 | intr = bt_sk(intr_sock->sk); | |
1323 | ||
1324 | if (ctrl->sk.sk_state != BT_CONNECTED || | |
1325 | intr->sk.sk_state != BT_CONNECTED) | |
1326 | return -EBADFD; | |
1327 | ||
1328 | /* early session check, we check again during session registration */ | |
1329 | session = hidp_session_find(&ctrl_chan->dst); | |
1330 | if (session) { | |
1331 | hidp_session_put(session); | |
1332 | return -EEXIST; | |
1333 | } | |
1334 | ||
1335 | return 0; | |
1336 | } | |
1337 | ||
1338 | int hidp_connection_add(struct hidp_connadd_req *req, | |
1339 | struct socket *ctrl_sock, | |
1340 | struct socket *intr_sock) | |
1341 | { | |
1342 | u32 valid_flags = BIT(HIDP_VIRTUAL_CABLE_UNPLUG) | | |
1343 | BIT(HIDP_BOOT_PROTOCOL_MODE); | |
1344 | struct hidp_session *session; | |
1345 | struct l2cap_conn *conn; | |
1346 | struct l2cap_chan *chan; | |
1347 | int ret; | |
1348 | ||
1349 | ret = hidp_verify_sockets(ctrl_sock, intr_sock); | |
1350 | if (ret) | |
1351 | return ret; | |
1352 | ||
1353 | if (req->flags & ~valid_flags) | |
1354 | return -EINVAL; | |
1355 | ||
1356 | chan = l2cap_pi(ctrl_sock->sk)->chan; | |
1357 | conn = NULL; | |
1358 | l2cap_chan_lock(chan); | |
1359 | if (chan->conn) | |
1360 | conn = l2cap_conn_get(chan->conn); | |
1361 | l2cap_chan_unlock(chan); | |
1362 | ||
1363 | if (!conn) | |
1364 | return -EBADFD; | |
1365 | ||
1366 | ret = hidp_session_new(&session, &chan->dst, ctrl_sock, | |
1367 | intr_sock, req, conn); | |
1368 | if (ret) | |
1369 | goto out_conn; | |
1370 | ||
1371 | ret = l2cap_register_user(conn, &session->user); | |
1372 | if (ret) | |
1373 | goto out_session; | |
1374 | ||
1375 | ret = 0; | |
1376 | ||
1377 | out_session: | |
1378 | hidp_session_put(session); | |
1379 | out_conn: | |
1380 | l2cap_conn_put(conn); | |
1381 | return ret; | |
1382 | } | |
1383 | ||
1384 | int hidp_connection_del(struct hidp_conndel_req *req) | |
1385 | { | |
1386 | u32 valid_flags = BIT(HIDP_VIRTUAL_CABLE_UNPLUG); | |
1387 | struct hidp_session *session; | |
1388 | ||
1389 | if (req->flags & ~valid_flags) | |
1390 | return -EINVAL; | |
1391 | ||
1392 | session = hidp_session_find(&req->bdaddr); | |
1393 | if (!session) | |
1394 | return -ENOENT; | |
1395 | ||
1396 | if (req->flags & BIT(HIDP_VIRTUAL_CABLE_UNPLUG)) | |
1397 | hidp_send_ctrl_message(session, | |
1398 | HIDP_TRANS_HID_CONTROL | | |
1399 | HIDP_CTRL_VIRTUAL_CABLE_UNPLUG, | |
1400 | NULL, 0); | |
1401 | else | |
1402 | l2cap_unregister_user(session->conn, &session->user); | |
1403 | ||
1404 | hidp_session_put(session); | |
1405 | ||
1406 | return 0; | |
1407 | } | |
1408 | ||
1409 | int hidp_get_connlist(struct hidp_connlist_req *req) | |
1410 | { | |
1411 | struct hidp_session *session; | |
1412 | int err = 0, n = 0; | |
1413 | ||
1414 | BT_DBG(""); | |
1415 | ||
1416 | down_read(&hidp_session_sem); | |
1417 | ||
1418 | list_for_each_entry(session, &hidp_session_list, list) { | |
1419 | struct hidp_conninfo ci; | |
1420 | ||
1421 | hidp_copy_session(session, &ci); | |
1422 | ||
1423 | if (copy_to_user(req->ci, &ci, sizeof(ci))) { | |
1424 | err = -EFAULT; | |
1425 | break; | |
1426 | } | |
1427 | ||
1428 | if (++n >= req->cnum) | |
1429 | break; | |
1430 | ||
1431 | req->ci++; | |
1432 | } | |
1433 | req->cnum = n; | |
1434 | ||
1435 | up_read(&hidp_session_sem); | |
1436 | return err; | |
1437 | } | |
1438 | ||
1439 | int hidp_get_conninfo(struct hidp_conninfo *ci) | |
1440 | { | |
1441 | struct hidp_session *session; | |
1442 | ||
1443 | session = hidp_session_find(&ci->bdaddr); | |
1444 | if (session) { | |
1445 | hidp_copy_session(session, ci); | |
1446 | hidp_session_put(session); | |
1447 | } | |
1448 | ||
1449 | return session ? 0 : -ENOENT; | |
1450 | } | |
1451 | ||
1452 | static int __init hidp_init(void) | |
1453 | { | |
1454 | BT_INFO("HIDP (Human Interface Emulation) ver %s", VERSION); | |
1455 | ||
1456 | return hidp_init_sockets(); | |
1457 | } | |
1458 | ||
1459 | static void __exit hidp_exit(void) | |
1460 | { | |
1461 | hidp_cleanup_sockets(); | |
1462 | } | |
1463 | ||
1464 | module_init(hidp_init); | |
1465 | module_exit(hidp_exit); | |
1466 | ||
1467 | MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); | |
1468 | MODULE_AUTHOR("David Herrmann <dh.herrmann@gmail.com>"); | |
1469 | MODULE_DESCRIPTION("Bluetooth HIDP ver " VERSION); | |
1470 | MODULE_VERSION(VERSION); | |
1471 | MODULE_LICENSE("GPL"); | |
1472 | MODULE_ALIAS("bt-proto-6"); |