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Commit | Line | Data |
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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 | { |
5f5da99f | 73 | u32 valid_flags = 0; |
d31dbf6e | 74 | memset(ci, 0, sizeof(*ci)); |
1da177e4 LT |
75 | bacpy(&ci->bdaddr, &session->bdaddr); |
76 | ||
5f5da99f | 77 | ci->flags = session->flags & valid_flags; |
dcc07647 | 78 | ci->state = BT_CONNECTED; |
1da177e4 | 79 | |
1da177e4 LT |
80 | if (session->input) { |
81 | ci->vendor = session->input->id.vendor; | |
82 | ci->product = session->input->id.product; | |
83 | ci->version = session->input->id.version; | |
84 | if (session->input->name) | |
673e1dd7 | 85 | strlcpy(ci->name, session->input->name, 128); |
1da177e4 | 86 | else |
673e1dd7 CG |
87 | strlcpy(ci->name, "HID Boot Device", 128); |
88 | } else if (session->hid) { | |
e1aaadd4 MH |
89 | ci->vendor = session->hid->vendor; |
90 | ci->product = session->hid->product; | |
91 | ci->version = session->hid->version; | |
673e1dd7 | 92 | strlcpy(ci->name, session->hid->name, 128); |
e1aaadd4 | 93 | } |
1da177e4 LT |
94 | } |
95 | ||
41edc0c0 DH |
96 | /* assemble skb, queue message on @transmit and wake up the session thread */ |
97 | static int hidp_send_message(struct hidp_session *session, struct socket *sock, | |
98 | struct sk_buff_head *transmit, unsigned char hdr, | |
99 | const unsigned char *data, int size) | |
100 | { | |
101 | struct sk_buff *skb; | |
102 | struct sock *sk = sock->sk; | |
103 | ||
104 | BT_DBG("session %p data %p size %d", session, data, size); | |
105 | ||
106 | if (atomic_read(&session->terminate)) | |
107 | return -EIO; | |
108 | ||
109 | skb = alloc_skb(size + 1, GFP_ATOMIC); | |
110 | if (!skb) { | |
111 | BT_ERR("Can't allocate memory for new frame"); | |
112 | return -ENOMEM; | |
113 | } | |
114 | ||
115 | *skb_put(skb, 1) = hdr; | |
116 | if (data && size > 0) | |
117 | memcpy(skb_put(skb, size), data, size); | |
118 | ||
119 | skb_queue_tail(transmit, skb); | |
120 | wake_up_interruptible(sk_sleep(sk)); | |
121 | ||
122 | return 0; | |
123 | } | |
124 | ||
125 | static int hidp_send_ctrl_message(struct hidp_session *session, | |
126 | unsigned char hdr, const unsigned char *data, | |
127 | int size) | |
128 | { | |
129 | return hidp_send_message(session, session->ctrl_sock, | |
130 | &session->ctrl_transmit, hdr, data, size); | |
131 | } | |
132 | ||
133 | static int hidp_send_intr_message(struct hidp_session *session, | |
134 | unsigned char hdr, const unsigned char *data, | |
135 | int size) | |
136 | { | |
137 | return hidp_send_message(session, session->intr_sock, | |
138 | &session->intr_transmit, hdr, data, size); | |
139 | } | |
140 | ||
af87b3d0 DH |
141 | static int hidp_input_event(struct input_dev *dev, unsigned int type, |
142 | unsigned int code, int value) | |
1da177e4 | 143 | { |
af87b3d0 | 144 | struct hidp_session *session = input_get_drvdata(dev); |
1da177e4 | 145 | unsigned char newleds; |
41edc0c0 | 146 | unsigned char hdr, data[2]; |
1da177e4 | 147 | |
af87b3d0 DH |
148 | BT_DBG("session %p type %d code %d value %d", |
149 | session, type, code, value); | |
1da177e4 LT |
150 | |
151 | if (type != EV_LED) | |
152 | return -1; | |
153 | ||
154 | newleds = (!!test_bit(LED_KANA, dev->led) << 3) | | |
155 | (!!test_bit(LED_COMPOSE, dev->led) << 3) | | |
156 | (!!test_bit(LED_SCROLLL, dev->led) << 2) | | |
157 | (!!test_bit(LED_CAPSL, dev->led) << 1) | | |
bdb94346 | 158 | (!!test_bit(LED_NUML, dev->led) << 0); |
1da177e4 LT |
159 | |
160 | if (session->leds == newleds) | |
161 | return 0; | |
162 | ||
163 | session->leds = newleds; | |
164 | ||
41edc0c0 DH |
165 | hdr = HIDP_TRANS_DATA | HIDP_DATA_RTYPE_OUPUT; |
166 | data[0] = 0x01; | |
167 | data[1] = newleds; | |
1da177e4 | 168 | |
41edc0c0 | 169 | return hidp_send_intr_message(session, hdr, data, 2); |
1da177e4 LT |
170 | } |
171 | ||
172 | static void hidp_input_report(struct hidp_session *session, struct sk_buff *skb) | |
173 | { | |
174 | struct input_dev *dev = session->input; | |
175 | unsigned char *keys = session->keys; | |
176 | unsigned char *udata = skb->data + 1; | |
177 | signed char *sdata = skb->data + 1; | |
178 | int i, size = skb->len - 1; | |
179 | ||
180 | switch (skb->data[0]) { | |
181 | case 0x01: /* Keyboard report */ | |
182 | for (i = 0; i < 8; i++) | |
183 | input_report_key(dev, hidp_keycode[i + 224], (udata[0] >> i) & 1); | |
184 | ||
185 | /* If all the key codes have been set to 0x01, it means | |
186 | * too many keys were pressed at the same time. */ | |
187 | if (!memcmp(udata + 2, hidp_mkeyspat, 6)) | |
188 | break; | |
189 | ||
190 | for (i = 2; i < 8; i++) { | |
191 | if (keys[i] > 3 && memscan(udata + 2, keys[i], 6) == udata + 8) { | |
192 | if (hidp_keycode[keys[i]]) | |
193 | input_report_key(dev, hidp_keycode[keys[i]], 0); | |
194 | else | |
195 | BT_ERR("Unknown key (scancode %#x) released.", keys[i]); | |
196 | } | |
197 | ||
198 | if (udata[i] > 3 && memscan(keys + 2, udata[i], 6) == keys + 8) { | |
199 | if (hidp_keycode[udata[i]]) | |
200 | input_report_key(dev, hidp_keycode[udata[i]], 1); | |
201 | else | |
202 | BT_ERR("Unknown key (scancode %#x) pressed.", udata[i]); | |
203 | } | |
204 | } | |
205 | ||
206 | memcpy(keys, udata, 8); | |
207 | break; | |
208 | ||
209 | case 0x02: /* Mouse report */ | |
210 | input_report_key(dev, BTN_LEFT, sdata[0] & 0x01); | |
211 | input_report_key(dev, BTN_RIGHT, sdata[0] & 0x02); | |
212 | input_report_key(dev, BTN_MIDDLE, sdata[0] & 0x04); | |
213 | input_report_key(dev, BTN_SIDE, sdata[0] & 0x08); | |
214 | input_report_key(dev, BTN_EXTRA, sdata[0] & 0x10); | |
215 | ||
216 | input_report_rel(dev, REL_X, sdata[1]); | |
217 | input_report_rel(dev, REL_Y, sdata[2]); | |
218 | ||
219 | if (size > 3) | |
220 | input_report_rel(dev, REL_WHEEL, sdata[3]); | |
221 | break; | |
222 | } | |
223 | ||
224 | input_sync(dev); | |
225 | } | |
226 | ||
0ff1731a AO |
227 | static int hidp_get_raw_report(struct hid_device *hid, |
228 | unsigned char report_number, | |
229 | unsigned char *data, size_t count, | |
230 | unsigned char report_type) | |
231 | { | |
232 | struct hidp_session *session = hid->driver_data; | |
233 | struct sk_buff *skb; | |
234 | size_t len; | |
235 | int numbered_reports = hid->report_enum[report_type].numbered; | |
794d1756 | 236 | int ret; |
0ff1731a | 237 | |
fd86c9be KR |
238 | if (atomic_read(&session->terminate)) |
239 | return -EIO; | |
240 | ||
0ff1731a AO |
241 | switch (report_type) { |
242 | case HID_FEATURE_REPORT: | |
243 | report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_FEATURE; | |
244 | break; | |
245 | case HID_INPUT_REPORT: | |
246 | report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_INPUT; | |
247 | break; | |
248 | case HID_OUTPUT_REPORT: | |
249 | report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_OUPUT; | |
250 | break; | |
251 | default: | |
252 | return -EINVAL; | |
253 | } | |
254 | ||
255 | if (mutex_lock_interruptible(&session->report_mutex)) | |
256 | return -ERESTARTSYS; | |
257 | ||
258 | /* Set up our wait, and send the report request to the device. */ | |
259 | session->waiting_report_type = report_type & HIDP_DATA_RTYPE_MASK; | |
260 | session->waiting_report_number = numbered_reports ? report_number : -1; | |
261 | set_bit(HIDP_WAITING_FOR_RETURN, &session->flags); | |
262 | data[0] = report_number; | |
41edc0c0 | 263 | ret = hidp_send_ctrl_message(session, report_type, data, 1); |
794d1756 DH |
264 | if (ret) |
265 | goto err; | |
0ff1731a AO |
266 | |
267 | /* Wait for the return of the report. The returned report | |
268 | gets put in session->report_return. */ | |
e3492dc3 DH |
269 | while (test_bit(HIDP_WAITING_FOR_RETURN, &session->flags) && |
270 | !atomic_read(&session->terminate)) { | |
0ff1731a AO |
271 | int res; |
272 | ||
273 | res = wait_event_interruptible_timeout(session->report_queue, | |
e3492dc3 DH |
274 | !test_bit(HIDP_WAITING_FOR_RETURN, &session->flags) |
275 | || atomic_read(&session->terminate), | |
0ff1731a AO |
276 | 5*HZ); |
277 | if (res == 0) { | |
278 | /* timeout */ | |
794d1756 DH |
279 | ret = -EIO; |
280 | goto err; | |
0ff1731a AO |
281 | } |
282 | if (res < 0) { | |
283 | /* signal */ | |
794d1756 DH |
284 | ret = -ERESTARTSYS; |
285 | goto err; | |
0ff1731a AO |
286 | } |
287 | } | |
288 | ||
289 | skb = session->report_return; | |
290 | if (skb) { | |
291 | len = skb->len < count ? skb->len : count; | |
292 | memcpy(data, skb->data, len); | |
293 | ||
294 | kfree_skb(skb); | |
295 | session->report_return = NULL; | |
296 | } else { | |
297 | /* Device returned a HANDSHAKE, indicating protocol error. */ | |
298 | len = -EIO; | |
299 | } | |
300 | ||
301 | clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags); | |
302 | mutex_unlock(&session->report_mutex); | |
303 | ||
304 | return len; | |
305 | ||
794d1756 | 306 | err: |
0ff1731a AO |
307 | clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags); |
308 | mutex_unlock(&session->report_mutex); | |
794d1756 | 309 | return ret; |
0ff1731a AO |
310 | } |
311 | ||
0a7f364e FP |
312 | static int hidp_set_raw_report(struct hid_device *hid, unsigned char reportnum, |
313 | unsigned char *data, size_t count, | |
314 | unsigned char report_type) | |
315 | { | |
316 | struct hidp_session *session = hid->driver_data; | |
317 | int ret; | |
318 | ||
319 | switch (report_type) { | |
320 | case HID_FEATURE_REPORT: | |
321 | report_type = HIDP_TRANS_SET_REPORT | HIDP_DATA_RTYPE_FEATURE; | |
322 | break; | |
323 | case HID_INPUT_REPORT: | |
324 | report_type = HIDP_TRANS_SET_REPORT | HIDP_DATA_RTYPE_INPUT; | |
325 | break; | |
326 | case HID_OUTPUT_REPORT: | |
327 | report_type = HIDP_TRANS_SET_REPORT | HIDP_DATA_RTYPE_OUPUT; | |
328 | break; | |
329 | default: | |
330 | return -EINVAL; | |
331 | } | |
332 | ||
333 | if (mutex_lock_interruptible(&session->report_mutex)) | |
334 | return -ERESTARTSYS; | |
335 | ||
336 | /* Set up our wait, and send the report request to the device. */ | |
337 | data[0] = reportnum; | |
338 | set_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags); | |
339 | ret = hidp_send_ctrl_message(session, report_type, data, count); | |
340 | if (ret) | |
341 | goto err; | |
342 | ||
343 | /* Wait for the ACK from the device. */ | |
344 | while (test_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags) && | |
345 | !atomic_read(&session->terminate)) { | |
346 | int res; | |
347 | ||
348 | res = wait_event_interruptible_timeout(session->report_queue, | |
349 | !test_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags) | |
350 | || atomic_read(&session->terminate), | |
351 | 10*HZ); | |
352 | if (res == 0) { | |
353 | /* timeout */ | |
354 | ret = -EIO; | |
355 | goto err; | |
356 | } | |
357 | if (res < 0) { | |
358 | /* signal */ | |
359 | ret = -ERESTARTSYS; | |
360 | goto err; | |
361 | } | |
362 | } | |
363 | ||
364 | if (!session->output_report_success) { | |
365 | ret = -EIO; | |
366 | goto err; | |
367 | } | |
368 | ||
369 | ret = count; | |
370 | ||
371 | err: | |
372 | clear_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags); | |
373 | mutex_unlock(&session->report_mutex); | |
374 | return ret; | |
375 | } | |
376 | ||
e9d5da97 | 377 | static int hidp_output_report(struct hid_device *hid, __u8 *data, size_t count) |
2da31939 | 378 | { |
0825411a | 379 | struct hidp_session *session = hid->driver_data; |
0825411a | 380 | |
e9d5da97 BT |
381 | return hidp_send_intr_message(session, |
382 | HIDP_TRANS_DATA | HIDP_DATA_RTYPE_OUPUT, | |
383 | data, count); | |
2da31939 JK |
384 | } |
385 | ||
0a7f364e FP |
386 | static int hidp_raw_request(struct hid_device *hid, unsigned char reportnum, |
387 | __u8 *buf, size_t len, unsigned char rtype, | |
388 | int reqtype) | |
389 | { | |
390 | switch (reqtype) { | |
391 | case HID_REQ_GET_REPORT: | |
392 | return hidp_get_raw_report(hid, reportnum, buf, len, rtype); | |
393 | case HID_REQ_SET_REPORT: | |
394 | return hidp_set_raw_report(hid, reportnum, buf, len, rtype); | |
395 | default: | |
396 | return -EIO; | |
397 | } | |
398 | } | |
399 | ||
1da177e4 LT |
400 | static void hidp_idle_timeout(unsigned long arg) |
401 | { | |
402 | struct hidp_session *session = (struct hidp_session *) arg; | |
403 | ||
5205185d | 404 | hidp_session_terminate(session); |
1da177e4 LT |
405 | } |
406 | ||
91f5cca3 | 407 | static void hidp_set_timer(struct hidp_session *session) |
1da177e4 LT |
408 | { |
409 | if (session->idle_to > 0) | |
410 | mod_timer(&session->timer, jiffies + HZ * session->idle_to); | |
411 | } | |
412 | ||
6039aa73 | 413 | static void hidp_del_timer(struct hidp_session *session) |
1da177e4 LT |
414 | { |
415 | if (session->idle_to > 0) | |
416 | del_timer(&session->timer); | |
417 | } | |
418 | ||
a4b1b587 DH |
419 | static void hidp_process_report(struct hidp_session *session, |
420 | int type, const u8 *data, int len, int intr) | |
421 | { | |
422 | if (len > HID_MAX_BUFFER_SIZE) | |
423 | len = HID_MAX_BUFFER_SIZE; | |
424 | ||
425 | memcpy(session->input_buf, data, len); | |
426 | hid_input_report(session->hid, type, session->input_buf, len, intr); | |
427 | } | |
428 | ||
91f5cca3 AM |
429 | static void hidp_process_handshake(struct hidp_session *session, |
430 | unsigned char param) | |
1da177e4 LT |
431 | { |
432 | BT_DBG("session %p param 0x%02x", session, param); | |
0825411a | 433 | session->output_report_success = 0; /* default condition */ |
1da177e4 LT |
434 | |
435 | switch (param) { | |
436 | case HIDP_HSHK_SUCCESSFUL: | |
437 | /* FIXME: Call into SET_ GET_ handlers here */ | |
0825411a | 438 | session->output_report_success = 1; |
1da177e4 LT |
439 | break; |
440 | ||
441 | case HIDP_HSHK_NOT_READY: | |
442 | case HIDP_HSHK_ERR_INVALID_REPORT_ID: | |
443 | case HIDP_HSHK_ERR_UNSUPPORTED_REQUEST: | |
444 | case HIDP_HSHK_ERR_INVALID_PARAMETER: | |
ab88f714 | 445 | if (test_and_clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags)) |
0ff1731a | 446 | wake_up_interruptible(&session->report_queue); |
ab88f714 | 447 | |
1da177e4 LT |
448 | /* FIXME: Call into SET_ GET_ handlers here */ |
449 | break; | |
450 | ||
451 | case HIDP_HSHK_ERR_UNKNOWN: | |
452 | break; | |
453 | ||
454 | case HIDP_HSHK_ERR_FATAL: | |
455 | /* Device requests a reboot, as this is the only way this error | |
8e87d142 | 456 | * can be recovered. */ |
41edc0c0 | 457 | hidp_send_ctrl_message(session, |
1da177e4 LT |
458 | HIDP_TRANS_HID_CONTROL | HIDP_CTRL_SOFT_RESET, NULL, 0); |
459 | break; | |
460 | ||
461 | default: | |
41edc0c0 | 462 | hidp_send_ctrl_message(session, |
1da177e4 LT |
463 | HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_INVALID_PARAMETER, NULL, 0); |
464 | break; | |
465 | } | |
0825411a AO |
466 | |
467 | /* Wake up the waiting thread. */ | |
ab88f714 | 468 | if (test_and_clear_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags)) |
0825411a | 469 | wake_up_interruptible(&session->report_queue); |
1da177e4 LT |
470 | } |
471 | ||
91f5cca3 AM |
472 | static void hidp_process_hid_control(struct hidp_session *session, |
473 | unsigned char param) | |
1da177e4 LT |
474 | { |
475 | BT_DBG("session %p param 0x%02x", session, param); | |
476 | ||
eff001e3 | 477 | if (param == HIDP_CTRL_VIRTUAL_CABLE_UNPLUG) { |
1da177e4 LT |
478 | /* Flush the transmit queues */ |
479 | skb_queue_purge(&session->ctrl_transmit); | |
480 | skb_queue_purge(&session->intr_transmit); | |
481 | ||
5205185d | 482 | hidp_session_terminate(session); |
1da177e4 LT |
483 | } |
484 | } | |
485 | ||
0ff1731a AO |
486 | /* Returns true if the passed-in skb should be freed by the caller. */ |
487 | static int hidp_process_data(struct hidp_session *session, struct sk_buff *skb, | |
91f5cca3 | 488 | unsigned char param) |
1da177e4 | 489 | { |
0ff1731a | 490 | int done_with_skb = 1; |
1da177e4 LT |
491 | BT_DBG("session %p skb %p len %d param 0x%02x", session, skb, skb->len, param); |
492 | ||
493 | switch (param) { | |
494 | case HIDP_DATA_RTYPE_INPUT: | |
495 | hidp_set_timer(session); | |
496 | ||
497 | if (session->input) | |
498 | hidp_input_report(session, skb); | |
e1aaadd4 MH |
499 | |
500 | if (session->hid) | |
a4b1b587 DH |
501 | hidp_process_report(session, HID_INPUT_REPORT, |
502 | skb->data, skb->len, 0); | |
1da177e4 LT |
503 | break; |
504 | ||
505 | case HIDP_DATA_RTYPE_OTHER: | |
506 | case HIDP_DATA_RTYPE_OUPUT: | |
507 | case HIDP_DATA_RTYPE_FEATURE: | |
508 | break; | |
509 | ||
510 | default: | |
41edc0c0 | 511 | hidp_send_ctrl_message(session, |
1da177e4 LT |
512 | HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_INVALID_PARAMETER, NULL, 0); |
513 | } | |
0ff1731a AO |
514 | |
515 | if (test_bit(HIDP_WAITING_FOR_RETURN, &session->flags) && | |
516 | param == session->waiting_report_type) { | |
517 | if (session->waiting_report_number < 0 || | |
518 | session->waiting_report_number == skb->data[0]) { | |
519 | /* hidp_get_raw_report() is waiting on this report. */ | |
520 | session->report_return = skb; | |
521 | done_with_skb = 0; | |
522 | clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags); | |
523 | wake_up_interruptible(&session->report_queue); | |
524 | } | |
525 | } | |
526 | ||
527 | return done_with_skb; | |
1da177e4 LT |
528 | } |
529 | ||
91f5cca3 AM |
530 | static void hidp_recv_ctrl_frame(struct hidp_session *session, |
531 | struct sk_buff *skb) | |
1da177e4 LT |
532 | { |
533 | unsigned char hdr, type, param; | |
0ff1731a | 534 | int free_skb = 1; |
1da177e4 LT |
535 | |
536 | BT_DBG("session %p skb %p len %d", session, skb, skb->len); | |
537 | ||
538 | hdr = skb->data[0]; | |
539 | skb_pull(skb, 1); | |
540 | ||
541 | type = hdr & HIDP_HEADER_TRANS_MASK; | |
542 | param = hdr & HIDP_HEADER_PARAM_MASK; | |
543 | ||
544 | switch (type) { | |
545 | case HIDP_TRANS_HANDSHAKE: | |
546 | hidp_process_handshake(session, param); | |
547 | break; | |
548 | ||
549 | case HIDP_TRANS_HID_CONTROL: | |
550 | hidp_process_hid_control(session, param); | |
551 | break; | |
552 | ||
553 | case HIDP_TRANS_DATA: | |
0ff1731a | 554 | free_skb = hidp_process_data(session, skb, param); |
1da177e4 LT |
555 | break; |
556 | ||
557 | default: | |
41edc0c0 | 558 | hidp_send_ctrl_message(session, |
1da177e4 LT |
559 | HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_UNSUPPORTED_REQUEST, NULL, 0); |
560 | break; | |
561 | } | |
562 | ||
0ff1731a AO |
563 | if (free_skb) |
564 | kfree_skb(skb); | |
1da177e4 LT |
565 | } |
566 | ||
91f5cca3 AM |
567 | static void hidp_recv_intr_frame(struct hidp_session *session, |
568 | struct sk_buff *skb) | |
1da177e4 LT |
569 | { |
570 | unsigned char hdr; | |
571 | ||
572 | BT_DBG("session %p skb %p len %d", session, skb, skb->len); | |
573 | ||
574 | hdr = skb->data[0]; | |
575 | skb_pull(skb, 1); | |
576 | ||
577 | if (hdr == (HIDP_TRANS_DATA | HIDP_DATA_RTYPE_INPUT)) { | |
578 | hidp_set_timer(session); | |
e1aaadd4 | 579 | |
1da177e4 LT |
580 | if (session->input) |
581 | hidp_input_report(session, skb); | |
e1aaadd4 MH |
582 | |
583 | if (session->hid) { | |
a4b1b587 DH |
584 | hidp_process_report(session, HID_INPUT_REPORT, |
585 | skb->data, skb->len, 1); | |
e1aaadd4 MH |
586 | BT_DBG("report len %d", skb->len); |
587 | } | |
1da177e4 LT |
588 | } else { |
589 | BT_DBG("Unsupported protocol header 0x%02x", hdr); | |
590 | } | |
591 | ||
592 | kfree_skb(skb); | |
593 | } | |
594 | ||
595 | static int hidp_send_frame(struct socket *sock, unsigned char *data, int len) | |
596 | { | |
597 | struct kvec iv = { data, len }; | |
598 | struct msghdr msg; | |
599 | ||
600 | BT_DBG("sock %p data %p len %d", sock, data, len); | |
601 | ||
602 | if (!len) | |
603 | return 0; | |
604 | ||
605 | memset(&msg, 0, sizeof(msg)); | |
606 | ||
607 | return kernel_sendmsg(sock, &msg, &iv, 1, len); | |
608 | } | |
609 | ||
7350e6cf DH |
610 | /* dequeue message from @transmit and send via @sock */ |
611 | static void hidp_process_transmit(struct hidp_session *session, | |
612 | struct sk_buff_head *transmit, | |
613 | struct socket *sock) | |
1da177e4 LT |
614 | { |
615 | struct sk_buff *skb; | |
2df01200 | 616 | int ret; |
1da177e4 LT |
617 | |
618 | BT_DBG("session %p", session); | |
619 | ||
7350e6cf DH |
620 | while ((skb = skb_dequeue(transmit))) { |
621 | ret = hidp_send_frame(sock, skb->data, skb->len); | |
2df01200 | 622 | if (ret == -EAGAIN) { |
7350e6cf | 623 | skb_queue_head(transmit, skb); |
1da177e4 | 624 | break; |
2df01200 DH |
625 | } else if (ret < 0) { |
626 | hidp_session_terminate(session); | |
627 | kfree_skb(skb); | |
628 | break; | |
1da177e4 LT |
629 | } |
630 | ||
631 | hidp_set_timer(session); | |
632 | kfree_skb(skb); | |
633 | } | |
1da177e4 LT |
634 | } |
635 | ||
91f5cca3 AM |
636 | static int hidp_setup_input(struct hidp_session *session, |
637 | struct hidp_connadd_req *req) | |
1da177e4 | 638 | { |
c500c971 | 639 | struct input_dev *input; |
3415a5fd | 640 | int i; |
1da177e4 | 641 | |
c500c971 JS |
642 | input = input_allocate_device(); |
643 | if (!input) | |
644 | return -ENOMEM; | |
645 | ||
646 | session->input = input; | |
647 | ||
5be39466 | 648 | input_set_drvdata(input, session); |
1da177e4 | 649 | |
34abf91f DT |
650 | input->name = "Bluetooth HID Boot Protocol Device"; |
651 | ||
1da177e4 LT |
652 | input->id.bustype = BUS_BLUETOOTH; |
653 | input->id.vendor = req->vendor; | |
654 | input->id.product = req->product; | |
655 | input->id.version = req->version; | |
656 | ||
657 | if (req->subclass & 0x40) { | |
658 | set_bit(EV_KEY, input->evbit); | |
659 | set_bit(EV_LED, input->evbit); | |
660 | set_bit(EV_REP, input->evbit); | |
661 | ||
662 | set_bit(LED_NUML, input->ledbit); | |
663 | set_bit(LED_CAPSL, input->ledbit); | |
664 | set_bit(LED_SCROLLL, input->ledbit); | |
665 | set_bit(LED_COMPOSE, input->ledbit); | |
666 | set_bit(LED_KANA, input->ledbit); | |
667 | ||
668 | for (i = 0; i < sizeof(hidp_keycode); i++) | |
669 | set_bit(hidp_keycode[i], input->keybit); | |
670 | clear_bit(0, input->keybit); | |
671 | } | |
672 | ||
673 | if (req->subclass & 0x80) { | |
7b19ada2 JS |
674 | input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL); |
675 | input->keybit[BIT_WORD(BTN_MOUSE)] = BIT_MASK(BTN_LEFT) | | |
676 | BIT_MASK(BTN_RIGHT) | BIT_MASK(BTN_MIDDLE); | |
677 | input->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y); | |
678 | input->keybit[BIT_WORD(BTN_MOUSE)] |= BIT_MASK(BTN_SIDE) | | |
679 | BIT_MASK(BTN_EXTRA); | |
680 | input->relbit[0] |= BIT_MASK(REL_WHEEL); | |
1da177e4 LT |
681 | } |
682 | ||
5205185d | 683 | input->dev.parent = &session->conn->hcon->dev; |
0a85b964 | 684 | |
1da177e4 LT |
685 | input->event = hidp_input_event; |
686 | ||
edad6388 | 687 | return 0; |
1da177e4 LT |
688 | } |
689 | ||
f5ffd462 MH |
690 | static int hidp_open(struct hid_device *hid) |
691 | { | |
692 | return 0; | |
693 | } | |
694 | ||
695 | static void hidp_close(struct hid_device *hid) | |
696 | { | |
697 | } | |
698 | ||
c500c971 JS |
699 | static int hidp_parse(struct hid_device *hid) |
700 | { | |
701 | struct hidp_session *session = hid->driver_data; | |
c500c971 | 702 | |
15c697ce MP |
703 | return hid_parse_report(session->hid, session->rd_data, |
704 | session->rd_size); | |
c500c971 JS |
705 | } |
706 | ||
707 | static int hidp_start(struct hid_device *hid) | |
708 | { | |
c500c971 JS |
709 | return 0; |
710 | } | |
711 | ||
712 | static void hidp_stop(struct hid_device *hid) | |
713 | { | |
714 | struct hidp_session *session = hid->driver_data; | |
715 | ||
716 | skb_queue_purge(&session->ctrl_transmit); | |
717 | skb_queue_purge(&session->intr_transmit); | |
718 | ||
c500c971 JS |
719 | hid->claimed = 0; |
720 | } | |
721 | ||
722 | static struct hid_ll_driver hidp_hid_driver = { | |
723 | .parse = hidp_parse, | |
724 | .start = hidp_start, | |
725 | .stop = hidp_stop, | |
726 | .open = hidp_open, | |
727 | .close = hidp_close, | |
0a7f364e FP |
728 | .raw_request = hidp_raw_request, |
729 | .output_report = hidp_output_report, | |
c500c971 JS |
730 | }; |
731 | ||
0f69dca2 AO |
732 | /* This function sets up the hid device. It does not add it |
733 | to the HID system. That is done in hidp_add_connection(). */ | |
85cdaf52 | 734 | static int hidp_setup_hid(struct hidp_session *session, |
91f5cca3 | 735 | struct hidp_connadd_req *req) |
e1aaadd4 | 736 | { |
c500c971 | 737 | struct hid_device *hid; |
edad6388 | 738 | int err; |
e1aaadd4 | 739 | |
a809eff1 FF |
740 | session->rd_data = memdup_user(req->rd_data, req->rd_size); |
741 | if (IS_ERR(session->rd_data)) | |
742 | return PTR_ERR(session->rd_data); | |
15c697ce | 743 | |
15c697ce MP |
744 | session->rd_size = req->rd_size; |
745 | ||
c500c971 | 746 | hid = hid_allocate_device(); |
15c697ce MP |
747 | if (IS_ERR(hid)) { |
748 | err = PTR_ERR(hid); | |
749 | goto fault; | |
750 | } | |
e1aaadd4 | 751 | |
c500c971 | 752 | session->hid = hid; |
15c697ce | 753 | |
e1aaadd4 MH |
754 | hid->driver_data = session; |
755 | ||
e1aaadd4 MH |
756 | hid->bus = BUS_BLUETOOTH; |
757 | hid->vendor = req->vendor; | |
758 | hid->product = req->product; | |
759 | hid->version = req->version; | |
c500c971 | 760 | hid->country = req->country; |
e1aaadd4 | 761 | |
0a9ab9bd | 762 | strncpy(hid->name, req->name, sizeof(req->name) - 1); |
fcb73338 AE |
763 | |
764 | snprintf(hid->phys, sizeof(hid->phys), "%pMR", | |
755b82aa | 765 | &l2cap_pi(session->ctrl_sock->sk)->chan->src); |
fcb73338 | 766 | |
dccf2f65 FP |
767 | /* NOTE: Some device modules depend on the dst address being stored in |
768 | * uniq. Please be aware of this before making changes to this behavior. | |
769 | */ | |
fcb73338 | 770 | snprintf(hid->uniq, sizeof(hid->uniq), "%pMR", |
755b82aa | 771 | &l2cap_pi(session->ctrl_sock->sk)->chan->dst); |
e1aaadd4 | 772 | |
5205185d | 773 | hid->dev.parent = &session->conn->hcon->dev; |
c500c971 | 774 | hid->ll_driver = &hidp_hid_driver; |
85cdaf52 | 775 | |
4529eefa LS |
776 | /* True if device is blacklisted in drivers/hid/hid-core.c */ |
777 | if (hid_ignore(hid)) { | |
778 | hid_destroy_device(session->hid); | |
779 | session->hid = NULL; | |
780 | return -ENODEV; | |
781 | } | |
782 | ||
c500c971 | 783 | return 0; |
edad6388 | 784 | |
15c697ce MP |
785 | fault: |
786 | kfree(session->rd_data); | |
787 | session->rd_data = NULL; | |
788 | ||
edad6388 | 789 | return err; |
e1aaadd4 MH |
790 | } |
791 | ||
b4f34d8d DH |
792 | /* initialize session devices */ |
793 | static int hidp_session_dev_init(struct hidp_session *session, | |
794 | struct hidp_connadd_req *req) | |
795 | { | |
796 | int ret; | |
797 | ||
798 | if (req->rd_size > 0) { | |
799 | ret = hidp_setup_hid(session, req); | |
800 | if (ret && ret != -ENODEV) | |
801 | return ret; | |
802 | } | |
803 | ||
804 | if (!session->hid) { | |
805 | ret = hidp_setup_input(session, req); | |
806 | if (ret < 0) | |
807 | return ret; | |
808 | } | |
809 | ||
810 | return 0; | |
811 | } | |
812 | ||
813 | /* destroy session devices */ | |
814 | static void hidp_session_dev_destroy(struct hidp_session *session) | |
815 | { | |
816 | if (session->hid) | |
817 | put_device(&session->hid->dev); | |
818 | else if (session->input) | |
819 | input_put_device(session->input); | |
820 | ||
821 | kfree(session->rd_data); | |
822 | session->rd_data = NULL; | |
823 | } | |
824 | ||
825 | /* add HID/input devices to their underlying bus systems */ | |
826 | static int hidp_session_dev_add(struct hidp_session *session) | |
827 | { | |
828 | int ret; | |
829 | ||
830 | /* Both HID and input systems drop a ref-count when unregistering the | |
831 | * device but they don't take a ref-count when registering them. Work | |
832 | * around this by explicitly taking a refcount during registration | |
833 | * which is dropped automatically by unregistering the devices. */ | |
834 | ||
835 | if (session->hid) { | |
836 | ret = hid_add_device(session->hid); | |
837 | if (ret) | |
838 | return ret; | |
839 | get_device(&session->hid->dev); | |
840 | } else if (session->input) { | |
841 | ret = input_register_device(session->input); | |
842 | if (ret) | |
843 | return ret; | |
844 | input_get_device(session->input); | |
845 | } | |
846 | ||
847 | return 0; | |
848 | } | |
849 | ||
850 | /* remove HID/input devices from their bus systems */ | |
851 | static void hidp_session_dev_del(struct hidp_session *session) | |
852 | { | |
853 | if (session->hid) | |
854 | hid_destroy_device(session->hid); | |
855 | else if (session->input) | |
856 | input_unregister_device(session->input); | |
857 | } | |
858 | ||
4e713cdf DH |
859 | /* |
860 | * Asynchronous device registration | |
861 | * HID device drivers might want to perform I/O during initialization to | |
862 | * detect device types. Therefore, call device registration in a separate | |
863 | * worker so the HIDP thread can schedule I/O operations. | |
864 | * Note that this must be called after the worker thread was initialized | |
865 | * successfully. This will then add the devices and increase session state | |
866 | * on success, otherwise it will terminate the session thread. | |
867 | */ | |
868 | static void hidp_session_dev_work(struct work_struct *work) | |
869 | { | |
870 | struct hidp_session *session = container_of(work, | |
871 | struct hidp_session, | |
872 | dev_init); | |
873 | int ret; | |
874 | ||
875 | ret = hidp_session_dev_add(session); | |
876 | if (!ret) | |
877 | atomic_inc(&session->state); | |
878 | else | |
879 | hidp_session_terminate(session); | |
880 | } | |
881 | ||
b4f34d8d DH |
882 | /* |
883 | * Create new session object | |
884 | * Allocate session object, initialize static fields, copy input data into the | |
885 | * object and take a reference to all sub-objects. | |
886 | * This returns 0 on success and puts a pointer to the new session object in | |
887 | * \out. Otherwise, an error code is returned. | |
888 | * The new session object has an initial ref-count of 1. | |
889 | */ | |
890 | static int hidp_session_new(struct hidp_session **out, const bdaddr_t *bdaddr, | |
891 | struct socket *ctrl_sock, | |
892 | struct socket *intr_sock, | |
893 | struct hidp_connadd_req *req, | |
894 | struct l2cap_conn *conn) | |
895 | { | |
896 | struct hidp_session *session; | |
897 | int ret; | |
898 | struct bt_sock *ctrl, *intr; | |
899 | ||
900 | ctrl = bt_sk(ctrl_sock->sk); | |
901 | intr = bt_sk(intr_sock->sk); | |
902 | ||
903 | session = kzalloc(sizeof(*session), GFP_KERNEL); | |
904 | if (!session) | |
905 | return -ENOMEM; | |
906 | ||
907 | /* object and runtime management */ | |
908 | kref_init(&session->ref); | |
909 | atomic_set(&session->state, HIDP_SESSION_IDLING); | |
910 | init_waitqueue_head(&session->state_queue); | |
fd6413d8 | 911 | session->flags = req->flags & BIT(HIDP_BLUETOOTH_VENDOR_ID); |
b4f34d8d DH |
912 | |
913 | /* connection management */ | |
914 | bacpy(&session->bdaddr, bdaddr); | |
51bb8457 | 915 | session->conn = l2cap_conn_get(conn); |
b4f34d8d DH |
916 | session->user.probe = hidp_session_probe; |
917 | session->user.remove = hidp_session_remove; | |
918 | session->ctrl_sock = ctrl_sock; | |
919 | session->intr_sock = intr_sock; | |
920 | skb_queue_head_init(&session->ctrl_transmit); | |
921 | skb_queue_head_init(&session->intr_transmit); | |
922 | session->ctrl_mtu = min_t(uint, l2cap_pi(ctrl)->chan->omtu, | |
923 | l2cap_pi(ctrl)->chan->imtu); | |
924 | session->intr_mtu = min_t(uint, l2cap_pi(intr)->chan->omtu, | |
925 | l2cap_pi(intr)->chan->imtu); | |
926 | session->idle_to = req->idle_to; | |
927 | ||
928 | /* device management */ | |
4e713cdf | 929 | INIT_WORK(&session->dev_init, hidp_session_dev_work); |
b4f34d8d DH |
930 | setup_timer(&session->timer, hidp_idle_timeout, |
931 | (unsigned long)session); | |
932 | ||
933 | /* session data */ | |
934 | mutex_init(&session->report_mutex); | |
935 | init_waitqueue_head(&session->report_queue); | |
936 | ||
937 | ret = hidp_session_dev_init(session, req); | |
938 | if (ret) | |
939 | goto err_free; | |
940 | ||
b4f34d8d DH |
941 | get_file(session->intr_sock->file); |
942 | get_file(session->ctrl_sock->file); | |
943 | *out = session; | |
944 | return 0; | |
945 | ||
946 | err_free: | |
51bb8457 | 947 | l2cap_conn_put(session->conn); |
b4f34d8d DH |
948 | kfree(session); |
949 | return ret; | |
950 | } | |
951 | ||
952 | /* increase ref-count of the given session by one */ | |
953 | static void hidp_session_get(struct hidp_session *session) | |
954 | { | |
955 | kref_get(&session->ref); | |
956 | } | |
957 | ||
958 | /* release callback */ | |
959 | static void session_free(struct kref *ref) | |
960 | { | |
961 | struct hidp_session *session = container_of(ref, struct hidp_session, | |
962 | ref); | |
963 | ||
964 | hidp_session_dev_destroy(session); | |
965 | skb_queue_purge(&session->ctrl_transmit); | |
966 | skb_queue_purge(&session->intr_transmit); | |
967 | fput(session->intr_sock->file); | |
968 | fput(session->ctrl_sock->file); | |
969 | l2cap_conn_put(session->conn); | |
970 | kfree(session); | |
971 | } | |
972 | ||
973 | /* decrease ref-count of the given session by one */ | |
974 | static void hidp_session_put(struct hidp_session *session) | |
975 | { | |
976 | kref_put(&session->ref, session_free); | |
977 | } | |
978 | ||
979 | /* | |
980 | * Search the list of active sessions for a session with target address | |
981 | * \bdaddr. You must hold at least a read-lock on \hidp_session_sem. As long as | |
982 | * you do not release this lock, the session objects cannot vanish and you can | |
983 | * safely take a reference to the session yourself. | |
984 | */ | |
985 | static struct hidp_session *__hidp_session_find(const bdaddr_t *bdaddr) | |
986 | { | |
987 | struct hidp_session *session; | |
988 | ||
989 | list_for_each_entry(session, &hidp_session_list, list) { | |
990 | if (!bacmp(bdaddr, &session->bdaddr)) | |
991 | return session; | |
992 | } | |
993 | ||
994 | return NULL; | |
995 | } | |
996 | ||
997 | /* | |
998 | * Same as __hidp_session_find() but no locks must be held. This also takes a | |
999 | * reference of the returned session (if non-NULL) so you must drop this | |
1000 | * reference if you no longer use the object. | |
1001 | */ | |
1002 | static struct hidp_session *hidp_session_find(const bdaddr_t *bdaddr) | |
1003 | { | |
1004 | struct hidp_session *session; | |
1005 | ||
1006 | down_read(&hidp_session_sem); | |
1007 | ||
1008 | session = __hidp_session_find(bdaddr); | |
1009 | if (session) | |
1010 | hidp_session_get(session); | |
1011 | ||
1012 | up_read(&hidp_session_sem); | |
1013 | ||
1014 | return session; | |
1015 | } | |
1016 | ||
1017 | /* | |
1018 | * Start session synchronously | |
1019 | * This starts a session thread and waits until initialization | |
1020 | * is done or returns an error if it couldn't be started. | |
1021 | * If this returns 0 the session thread is up and running. You must call | |
1022 | * hipd_session_stop_sync() before deleting any runtime resources. | |
1023 | */ | |
1024 | static int hidp_session_start_sync(struct hidp_session *session) | |
1025 | { | |
1026 | unsigned int vendor, product; | |
1027 | ||
1028 | if (session->hid) { | |
1029 | vendor = session->hid->vendor; | |
1030 | product = session->hid->product; | |
1031 | } else if (session->input) { | |
1032 | vendor = session->input->id.vendor; | |
1033 | product = session->input->id.product; | |
1034 | } else { | |
1035 | vendor = 0x0000; | |
1036 | product = 0x0000; | |
1037 | } | |
1038 | ||
1039 | session->task = kthread_run(hidp_session_thread, session, | |
1040 | "khidpd_%04x%04x", vendor, product); | |
1041 | if (IS_ERR(session->task)) | |
1042 | return PTR_ERR(session->task); | |
1043 | ||
1044 | while (atomic_read(&session->state) <= HIDP_SESSION_IDLING) | |
1045 | wait_event(session->state_queue, | |
1046 | atomic_read(&session->state) > HIDP_SESSION_IDLING); | |
1047 | ||
1048 | return 0; | |
1049 | } | |
1050 | ||
1051 | /* | |
1052 | * Terminate session thread | |
1053 | * Wake up session thread and notify it to stop. This is asynchronous and | |
1054 | * returns immediately. Call this whenever a runtime error occurs and you want | |
1055 | * the session to stop. | |
1056 | * Note: wake_up_process() performs any necessary memory-barriers for us. | |
1057 | */ | |
1058 | static void hidp_session_terminate(struct hidp_session *session) | |
1059 | { | |
1060 | atomic_inc(&session->terminate); | |
1061 | wake_up_process(session->task); | |
1062 | } | |
1063 | ||
1064 | /* | |
1065 | * Probe HIDP session | |
1066 | * This is called from the l2cap_conn core when our l2cap_user object is bound | |
1067 | * to the hci-connection. We get the session via the \user object and can now | |
4e713cdf DH |
1068 | * start the session thread, link it into the global session list and |
1069 | * schedule HID/input device registration. | |
b4f34d8d DH |
1070 | * The global session-list owns its own reference to the session object so you |
1071 | * can drop your own reference after registering the l2cap_user object. | |
1072 | */ | |
1073 | static int hidp_session_probe(struct l2cap_conn *conn, | |
1074 | struct l2cap_user *user) | |
1075 | { | |
1076 | struct hidp_session *session = container_of(user, | |
1077 | struct hidp_session, | |
1078 | user); | |
1079 | struct hidp_session *s; | |
1080 | int ret; | |
1081 | ||
1082 | down_write(&hidp_session_sem); | |
1083 | ||
1084 | /* check that no other session for this device exists */ | |
1085 | s = __hidp_session_find(&session->bdaddr); | |
1086 | if (s) { | |
1087 | ret = -EEXIST; | |
1088 | goto out_unlock; | |
1089 | } | |
1090 | ||
4e713cdf DH |
1091 | if (session->input) { |
1092 | ret = hidp_session_dev_add(session); | |
1093 | if (ret) | |
1094 | goto out_unlock; | |
1095 | } | |
1096 | ||
b4f34d8d DH |
1097 | ret = hidp_session_start_sync(session); |
1098 | if (ret) | |
4e713cdf | 1099 | goto out_del; |
b4f34d8d | 1100 | |
4e713cdf DH |
1101 | /* HID device registration is async to allow I/O during probe */ |
1102 | if (session->input) | |
1103 | atomic_inc(&session->state); | |
1104 | else | |
1105 | schedule_work(&session->dev_init); | |
b4f34d8d DH |
1106 | |
1107 | hidp_session_get(session); | |
1108 | list_add(&session->list, &hidp_session_list); | |
1109 | ret = 0; | |
1110 | goto out_unlock; | |
1111 | ||
4e713cdf DH |
1112 | out_del: |
1113 | if (session->input) | |
1114 | hidp_session_dev_del(session); | |
b4f34d8d DH |
1115 | out_unlock: |
1116 | up_write(&hidp_session_sem); | |
1117 | return ret; | |
1118 | } | |
1119 | ||
1120 | /* | |
1121 | * Remove HIDP session | |
1122 | * Called from the l2cap_conn core when either we explicitly unregistered | |
1123 | * the l2cap_user object or if the underlying connection is shut down. | |
1124 | * We signal the hidp-session thread to shut down, unregister the HID/input | |
1125 | * devices and unlink the session from the global list. | |
1126 | * This drops the reference to the session that is owned by the global | |
1127 | * session-list. | |
1128 | * Note: We _must_ not synchronosly wait for the session-thread to shut down. | |
1129 | * This is, because the session-thread might be waiting for an HCI lock that is | |
1130 | * held while we are called. Therefore, we only unregister the devices and | |
1131 | * notify the session-thread to terminate. The thread itself owns a reference | |
1132 | * to the session object so it can safely shut down. | |
1133 | */ | |
1134 | static void hidp_session_remove(struct l2cap_conn *conn, | |
1135 | struct l2cap_user *user) | |
1136 | { | |
1137 | struct hidp_session *session = container_of(user, | |
1138 | struct hidp_session, | |
1139 | user); | |
1140 | ||
1141 | down_write(&hidp_session_sem); | |
1142 | ||
1143 | hidp_session_terminate(session); | |
4e713cdf DH |
1144 | |
1145 | cancel_work_sync(&session->dev_init); | |
1146 | if (session->input || | |
1147 | atomic_read(&session->state) > HIDP_SESSION_PREPARING) | |
1148 | hidp_session_dev_del(session); | |
1149 | ||
b4f34d8d DH |
1150 | list_del(&session->list); |
1151 | ||
1152 | up_write(&hidp_session_sem); | |
1153 | ||
1154 | hidp_session_put(session); | |
1155 | } | |
1156 | ||
1157 | /* | |
1158 | * Session Worker | |
1159 | * This performs the actual main-loop of the HIDP worker. We first check | |
1160 | * whether the underlying connection is still alive, then parse all pending | |
1161 | * messages and finally send all outstanding messages. | |
1162 | */ | |
1163 | static void hidp_session_run(struct hidp_session *session) | |
1164 | { | |
1165 | struct sock *ctrl_sk = session->ctrl_sock->sk; | |
1166 | struct sock *intr_sk = session->intr_sock->sk; | |
1167 | struct sk_buff *skb; | |
1168 | ||
1169 | for (;;) { | |
1170 | /* | |
1171 | * This thread can be woken up two ways: | |
1172 | * - You call hidp_session_terminate() which sets the | |
1173 | * session->terminate flag and wakes this thread up. | |
1174 | * - Via modifying the socket state of ctrl/intr_sock. This | |
1175 | * thread is woken up by ->sk_state_changed(). | |
1176 | * | |
1177 | * Note: set_current_state() performs any necessary | |
1178 | * memory-barriers for us. | |
1179 | */ | |
1180 | set_current_state(TASK_INTERRUPTIBLE); | |
1181 | ||
1182 | if (atomic_read(&session->terminate)) | |
1183 | break; | |
1184 | ||
1185 | if (ctrl_sk->sk_state != BT_CONNECTED || | |
1186 | intr_sk->sk_state != BT_CONNECTED) | |
1187 | break; | |
1188 | ||
1189 | /* parse incoming intr-skbs */ | |
1190 | while ((skb = skb_dequeue(&intr_sk->sk_receive_queue))) { | |
1191 | skb_orphan(skb); | |
1192 | if (!skb_linearize(skb)) | |
1193 | hidp_recv_intr_frame(session, skb); | |
1194 | else | |
1195 | kfree_skb(skb); | |
1196 | } | |
1197 | ||
1198 | /* send pending intr-skbs */ | |
7350e6cf DH |
1199 | hidp_process_transmit(session, &session->intr_transmit, |
1200 | session->intr_sock); | |
b4f34d8d DH |
1201 | |
1202 | /* parse incoming ctrl-skbs */ | |
1203 | while ((skb = skb_dequeue(&ctrl_sk->sk_receive_queue))) { | |
1204 | skb_orphan(skb); | |
1205 | if (!skb_linearize(skb)) | |
1206 | hidp_recv_ctrl_frame(session, skb); | |
1207 | else | |
1208 | kfree_skb(skb); | |
1209 | } | |
1210 | ||
1211 | /* send pending ctrl-skbs */ | |
7350e6cf DH |
1212 | hidp_process_transmit(session, &session->ctrl_transmit, |
1213 | session->ctrl_sock); | |
b4f34d8d DH |
1214 | |
1215 | schedule(); | |
1216 | } | |
1217 | ||
1218 | atomic_inc(&session->terminate); | |
1219 | set_current_state(TASK_RUNNING); | |
1220 | } | |
1221 | ||
1222 | /* | |
1223 | * HIDP session thread | |
1224 | * This thread runs the I/O for a single HIDP session. Startup is synchronous | |
1225 | * which allows us to take references to ourself here instead of doing that in | |
1226 | * the caller. | |
1227 | * When we are ready to run we notify the caller and call hidp_session_run(). | |
1228 | */ | |
1229 | static int hidp_session_thread(void *arg) | |
1230 | { | |
1231 | struct hidp_session *session = arg; | |
1232 | wait_queue_t ctrl_wait, intr_wait; | |
1233 | ||
1234 | BT_DBG("session %p", session); | |
1235 | ||
1236 | /* initialize runtime environment */ | |
1237 | hidp_session_get(session); | |
1238 | __module_get(THIS_MODULE); | |
1239 | set_user_nice(current, -15); | |
1240 | hidp_set_timer(session); | |
1241 | ||
1242 | init_waitqueue_entry(&ctrl_wait, current); | |
1243 | init_waitqueue_entry(&intr_wait, current); | |
1244 | add_wait_queue(sk_sleep(session->ctrl_sock->sk), &ctrl_wait); | |
1245 | add_wait_queue(sk_sleep(session->intr_sock->sk), &intr_wait); | |
1246 | /* This memory barrier is paired with wq_has_sleeper(). See | |
1247 | * sock_poll_wait() for more information why this is needed. */ | |
1248 | smp_mb(); | |
1249 | ||
1250 | /* notify synchronous startup that we're ready */ | |
1251 | atomic_inc(&session->state); | |
1252 | wake_up(&session->state_queue); | |
1253 | ||
1254 | /* run session */ | |
1255 | hidp_session_run(session); | |
1256 | ||
1257 | /* cleanup runtime environment */ | |
1258 | remove_wait_queue(sk_sleep(session->intr_sock->sk), &intr_wait); | |
1259 | remove_wait_queue(sk_sleep(session->intr_sock->sk), &ctrl_wait); | |
1260 | wake_up_interruptible(&session->report_queue); | |
1261 | hidp_del_timer(session); | |
1262 | ||
1263 | /* | |
1264 | * If we stopped ourself due to any internal signal, we should try to | |
1265 | * unregister our own session here to avoid having it linger until the | |
1266 | * parent l2cap_conn dies or user-space cleans it up. | |
1267 | * This does not deadlock as we don't do any synchronous shutdown. | |
1268 | * Instead, this call has the same semantics as if user-space tried to | |
1269 | * delete the session. | |
1270 | */ | |
1271 | l2cap_unregister_user(session->conn, &session->user); | |
1272 | hidp_session_put(session); | |
1273 | ||
1274 | module_put_and_exit(0); | |
1275 | return 0; | |
1276 | } | |
1277 | ||
1278 | static int hidp_verify_sockets(struct socket *ctrl_sock, | |
1279 | struct socket *intr_sock) | |
1280 | { | |
755b82aa | 1281 | struct l2cap_chan *ctrl_chan, *intr_chan; |
b4f34d8d DH |
1282 | struct bt_sock *ctrl, *intr; |
1283 | struct hidp_session *session; | |
1284 | ||
1285 | if (!l2cap_is_socket(ctrl_sock) || !l2cap_is_socket(intr_sock)) | |
1286 | return -EINVAL; | |
1287 | ||
755b82aa MH |
1288 | ctrl_chan = l2cap_pi(ctrl_sock->sk)->chan; |
1289 | intr_chan = l2cap_pi(intr_sock->sk)->chan; | |
1290 | ||
1291 | if (bacmp(&ctrl_chan->src, &intr_chan->src) || | |
1292 | bacmp(&ctrl_chan->dst, &intr_chan->dst)) | |
1293 | return -ENOTUNIQ; | |
1294 | ||
b4f34d8d DH |
1295 | ctrl = bt_sk(ctrl_sock->sk); |
1296 | intr = bt_sk(intr_sock->sk); | |
1297 | ||
b4f34d8d DH |
1298 | if (ctrl->sk.sk_state != BT_CONNECTED || |
1299 | intr->sk.sk_state != BT_CONNECTED) | |
1300 | return -EBADFD; | |
1301 | ||
1302 | /* early session check, we check again during session registration */ | |
755b82aa | 1303 | session = hidp_session_find(&ctrl_chan->dst); |
b4f34d8d DH |
1304 | if (session) { |
1305 | hidp_session_put(session); | |
1306 | return -EEXIST; | |
1307 | } | |
1308 | ||
1309 | return 0; | |
1310 | } | |
1311 | ||
1312 | int hidp_connection_add(struct hidp_connadd_req *req, | |
1313 | struct socket *ctrl_sock, | |
1314 | struct socket *intr_sock) | |
1315 | { | |
1f5014d6 MH |
1316 | u32 valid_flags = BIT(HIDP_VIRTUAL_CABLE_UNPLUG) | |
1317 | BIT(HIDP_BOOT_PROTOCOL_MODE); | |
b4f34d8d DH |
1318 | struct hidp_session *session; |
1319 | struct l2cap_conn *conn; | |
51bda2bc | 1320 | struct l2cap_chan *chan; |
b4f34d8d DH |
1321 | int ret; |
1322 | ||
1323 | ret = hidp_verify_sockets(ctrl_sock, intr_sock); | |
1324 | if (ret) | |
1325 | return ret; | |
1326 | ||
5f5da99f MH |
1327 | if (req->flags & ~valid_flags) |
1328 | return -EINVAL; | |
1329 | ||
51bda2bc | 1330 | chan = l2cap_pi(ctrl_sock->sk)->chan; |
b4f34d8d DH |
1331 | conn = NULL; |
1332 | l2cap_chan_lock(chan); | |
51bb8457 JH |
1333 | if (chan->conn) |
1334 | conn = l2cap_conn_get(chan->conn); | |
b4f34d8d DH |
1335 | l2cap_chan_unlock(chan); |
1336 | ||
1337 | if (!conn) | |
1338 | return -EBADFD; | |
1339 | ||
755b82aa | 1340 | ret = hidp_session_new(&session, &chan->dst, ctrl_sock, |
b4f34d8d DH |
1341 | intr_sock, req, conn); |
1342 | if (ret) | |
1343 | goto out_conn; | |
1344 | ||
1345 | ret = l2cap_register_user(conn, &session->user); | |
1346 | if (ret) | |
1347 | goto out_session; | |
1348 | ||
1349 | ret = 0; | |
1350 | ||
1351 | out_session: | |
1352 | hidp_session_put(session); | |
1353 | out_conn: | |
1354 | l2cap_conn_put(conn); | |
1355 | return ret; | |
1356 | } | |
1357 | ||
1358 | int hidp_connection_del(struct hidp_conndel_req *req) | |
1359 | { | |
5f5da99f | 1360 | u32 valid_flags = BIT(HIDP_VIRTUAL_CABLE_UNPLUG); |
b4f34d8d DH |
1361 | struct hidp_session *session; |
1362 | ||
5f5da99f MH |
1363 | if (req->flags & ~valid_flags) |
1364 | return -EINVAL; | |
1365 | ||
b4f34d8d DH |
1366 | session = hidp_session_find(&req->bdaddr); |
1367 | if (!session) | |
1368 | return -ENOENT; | |
1369 | ||
fd6413d8 | 1370 | if (req->flags & BIT(HIDP_VIRTUAL_CABLE_UNPLUG)) |
b4f34d8d DH |
1371 | hidp_send_ctrl_message(session, |
1372 | HIDP_TRANS_HID_CONTROL | | |
1373 | HIDP_CTRL_VIRTUAL_CABLE_UNPLUG, | |
1374 | NULL, 0); | |
1375 | else | |
1376 | l2cap_unregister_user(session->conn, &session->user); | |
1377 | ||
1378 | hidp_session_put(session); | |
1379 | ||
1380 | return 0; | |
1381 | } | |
1382 | ||
1da177e4 LT |
1383 | int hidp_get_connlist(struct hidp_connlist_req *req) |
1384 | { | |
cd11cdd2 | 1385 | struct hidp_session *session; |
1da177e4 LT |
1386 | int err = 0, n = 0; |
1387 | ||
1388 | BT_DBG(""); | |
1389 | ||
1390 | down_read(&hidp_session_sem); | |
1391 | ||
cd11cdd2 | 1392 | list_for_each_entry(session, &hidp_session_list, list) { |
1da177e4 LT |
1393 | struct hidp_conninfo ci; |
1394 | ||
5205185d | 1395 | hidp_copy_session(session, &ci); |
1da177e4 LT |
1396 | |
1397 | if (copy_to_user(req->ci, &ci, sizeof(ci))) { | |
1398 | err = -EFAULT; | |
1399 | break; | |
1400 | } | |
1401 | ||
1402 | if (++n >= req->cnum) | |
1403 | break; | |
1404 | ||
1405 | req->ci++; | |
1406 | } | |
1407 | req->cnum = n; | |
1408 | ||
1409 | up_read(&hidp_session_sem); | |
1410 | return err; | |
1411 | } | |
1412 | ||
1413 | int hidp_get_conninfo(struct hidp_conninfo *ci) | |
1414 | { | |
1415 | struct hidp_session *session; | |
1da177e4 | 1416 | |
5205185d DH |
1417 | session = hidp_session_find(&ci->bdaddr); |
1418 | if (session) { | |
1419 | hidp_copy_session(session, ci); | |
1420 | hidp_session_put(session); | |
1421 | } | |
1da177e4 | 1422 | |
5205185d | 1423 | return session ? 0 : -ENOENT; |
1da177e4 LT |
1424 | } |
1425 | ||
1426 | static int __init hidp_init(void) | |
1427 | { | |
1da177e4 LT |
1428 | BT_INFO("HIDP (Human Interface Emulation) ver %s", VERSION); |
1429 | ||
8215d557 | 1430 | return hidp_init_sockets(); |
1da177e4 LT |
1431 | } |
1432 | ||
1433 | static void __exit hidp_exit(void) | |
1434 | { | |
1435 | hidp_cleanup_sockets(); | |
1436 | } | |
1437 | ||
1438 | module_init(hidp_init); | |
1439 | module_exit(hidp_exit); | |
1440 | ||
1441 | MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); | |
b4f34d8d | 1442 | MODULE_AUTHOR("David Herrmann <dh.herrmann@gmail.com>"); |
1da177e4 LT |
1443 | MODULE_DESCRIPTION("Bluetooth HIDP ver " VERSION); |
1444 | MODULE_VERSION(VERSION); | |
1445 | MODULE_LICENSE("GPL"); | |
1446 | MODULE_ALIAS("bt-proto-6"); |