Commit | Line | Data |
---|---|---|
1ccd7a2a DH |
1 | /* |
2 | * User-space I/O driver support for HID subsystem | |
3 | * Copyright (c) 2012 David Herrmann | |
4 | */ | |
5 | ||
6 | /* | |
7 | * This program is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License as published by the Free | |
9 | * Software Foundation; either version 2 of the License, or (at your option) | |
10 | * any later version. | |
11 | */ | |
12 | ||
13 | #include <linux/atomic.h> | |
befde022 | 14 | #include <linux/compat.h> |
1ccd7a2a DH |
15 | #include <linux/device.h> |
16 | #include <linux/fs.h> | |
17 | #include <linux/hid.h> | |
18 | #include <linux/input.h> | |
19 | #include <linux/miscdevice.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/mutex.h> | |
22 | #include <linux/poll.h> | |
23 | #include <linux/sched.h> | |
24 | #include <linux/spinlock.h> | |
25 | #include <linux/uhid.h> | |
26 | #include <linux/wait.h> | |
27 | ||
28 | #define UHID_NAME "uhid" | |
ace3d861 DH |
29 | #define UHID_BUFSIZE 32 |
30 | ||
31 | struct uhid_device { | |
d937ae5f | 32 | struct mutex devlock; |
d365c6cf DH |
33 | bool running; |
34 | ||
35 | __u8 *rd_data; | |
36 | uint rd_size; | |
37 | ||
ace3d861 | 38 | struct hid_device *hid; |
6664ef72 | 39 | struct uhid_event input_buf; |
ace3d861 DH |
40 | |
41 | wait_queue_head_t waitq; | |
42 | spinlock_t qlock; | |
43 | __u8 head; | |
44 | __u8 tail; | |
45 | struct uhid_event *outq[UHID_BUFSIZE]; | |
fcfcf0de | 46 | |
8cad5b01 | 47 | /* blocking GET_REPORT support; state changes protected by qlock */ |
fcfcf0de DH |
48 | struct mutex report_lock; |
49 | wait_queue_head_t report_wait; | |
5942b849 | 50 | bool report_running; |
8cad5b01 | 51 | u32 report_id; |
11c22155 | 52 | u32 report_type; |
fcfcf0de | 53 | struct uhid_event report_buf; |
ace3d861 | 54 | }; |
1ccd7a2a DH |
55 | |
56 | static struct miscdevice uhid_misc; | |
57 | ||
ace3d861 DH |
58 | static void uhid_queue(struct uhid_device *uhid, struct uhid_event *ev) |
59 | { | |
60 | __u8 newhead; | |
61 | ||
62 | newhead = (uhid->head + 1) % UHID_BUFSIZE; | |
63 | ||
64 | if (newhead != uhid->tail) { | |
65 | uhid->outq[uhid->head] = ev; | |
66 | uhid->head = newhead; | |
67 | wake_up_interruptible(&uhid->waitq); | |
68 | } else { | |
69 | hid_warn(uhid->hid, "Output queue is full\n"); | |
70 | kfree(ev); | |
71 | } | |
72 | } | |
73 | ||
74 | static int uhid_queue_event(struct uhid_device *uhid, __u32 event) | |
75 | { | |
76 | unsigned long flags; | |
77 | struct uhid_event *ev; | |
78 | ||
79 | ev = kzalloc(sizeof(*ev), GFP_KERNEL); | |
80 | if (!ev) | |
81 | return -ENOMEM; | |
82 | ||
83 | ev->type = event; | |
84 | ||
85 | spin_lock_irqsave(&uhid->qlock, flags); | |
86 | uhid_queue(uhid, ev); | |
87 | spin_unlock_irqrestore(&uhid->qlock, flags); | |
88 | ||
89 | return 0; | |
90 | } | |
91 | ||
d365c6cf DH |
92 | static int uhid_hid_start(struct hid_device *hid) |
93 | { | |
ec4b7dea | 94 | struct uhid_device *uhid = hid->driver_data; |
c2b2f16c DH |
95 | struct uhid_event *ev; |
96 | unsigned long flags; | |
97 | ||
98 | ev = kzalloc(sizeof(*ev), GFP_KERNEL); | |
99 | if (!ev) | |
100 | return -ENOMEM; | |
101 | ||
102 | ev->type = UHID_START; | |
ec4b7dea | 103 | |
c2b2f16c DH |
104 | if (hid->report_enum[HID_FEATURE_REPORT].numbered) |
105 | ev->u.start.dev_flags |= UHID_DEV_NUMBERED_FEATURE_REPORTS; | |
106 | if (hid->report_enum[HID_OUTPUT_REPORT].numbered) | |
107 | ev->u.start.dev_flags |= UHID_DEV_NUMBERED_OUTPUT_REPORTS; | |
108 | if (hid->report_enum[HID_INPUT_REPORT].numbered) | |
109 | ev->u.start.dev_flags |= UHID_DEV_NUMBERED_INPUT_REPORTS; | |
110 | ||
111 | spin_lock_irqsave(&uhid->qlock, flags); | |
112 | uhid_queue(uhid, ev); | |
113 | spin_unlock_irqrestore(&uhid->qlock, flags); | |
114 | ||
115 | return 0; | |
d365c6cf DH |
116 | } |
117 | ||
118 | static void uhid_hid_stop(struct hid_device *hid) | |
119 | { | |
ec4b7dea DH |
120 | struct uhid_device *uhid = hid->driver_data; |
121 | ||
122 | hid->claimed = 0; | |
123 | uhid_queue_event(uhid, UHID_STOP); | |
d365c6cf DH |
124 | } |
125 | ||
126 | static int uhid_hid_open(struct hid_device *hid) | |
127 | { | |
e7191474 DH |
128 | struct uhid_device *uhid = hid->driver_data; |
129 | ||
130 | return uhid_queue_event(uhid, UHID_OPEN); | |
d365c6cf DH |
131 | } |
132 | ||
133 | static void uhid_hid_close(struct hid_device *hid) | |
134 | { | |
e7191474 DH |
135 | struct uhid_device *uhid = hid->driver_data; |
136 | ||
137 | uhid_queue_event(uhid, UHID_CLOSE); | |
d365c6cf DH |
138 | } |
139 | ||
d365c6cf DH |
140 | static int uhid_hid_parse(struct hid_device *hid) |
141 | { | |
037c061b DH |
142 | struct uhid_device *uhid = hid->driver_data; |
143 | ||
144 | return hid_parse_report(hid, uhid->rd_data, uhid->rd_size); | |
d365c6cf DH |
145 | } |
146 | ||
11c22155 DH |
147 | /* must be called with report_lock held */ |
148 | static int __uhid_report_queue_and_wait(struct uhid_device *uhid, | |
149 | struct uhid_event *ev, | |
150 | __u32 *report_id) | |
151 | { | |
152 | unsigned long flags; | |
153 | int ret; | |
154 | ||
155 | spin_lock_irqsave(&uhid->qlock, flags); | |
156 | *report_id = ++uhid->report_id; | |
8493ecca | 157 | uhid->report_type = ev->type + 1; |
11c22155 DH |
158 | uhid->report_running = true; |
159 | uhid_queue(uhid, ev); | |
160 | spin_unlock_irqrestore(&uhid->qlock, flags); | |
161 | ||
162 | ret = wait_event_interruptible_timeout(uhid->report_wait, | |
163 | !uhid->report_running || !uhid->running, | |
164 | 5 * HZ); | |
165 | if (!ret || !uhid->running || uhid->report_running) | |
166 | ret = -EIO; | |
167 | else if (ret < 0) | |
168 | ret = -ERESTARTSYS; | |
169 | else | |
170 | ret = 0; | |
171 | ||
172 | uhid->report_running = false; | |
173 | ||
174 | return ret; | |
175 | } | |
176 | ||
177 | static void uhid_report_wake_up(struct uhid_device *uhid, u32 id, | |
178 | const struct uhid_event *ev) | |
179 | { | |
180 | unsigned long flags; | |
181 | ||
182 | spin_lock_irqsave(&uhid->qlock, flags); | |
183 | ||
184 | /* id for old report; drop it silently */ | |
185 | if (uhid->report_type != ev->type || uhid->report_id != id) | |
186 | goto unlock; | |
187 | if (!uhid->report_running) | |
188 | goto unlock; | |
189 | ||
190 | memcpy(&uhid->report_buf, ev, sizeof(*ev)); | |
191 | uhid->report_running = false; | |
192 | wake_up_interruptible(&uhid->report_wait); | |
193 | ||
194 | unlock: | |
195 | spin_unlock_irqrestore(&uhid->qlock, flags); | |
196 | } | |
197 | ||
fa71f32b | 198 | static int uhid_hid_get_report(struct hid_device *hid, unsigned char rnum, |
11c22155 | 199 | u8 *buf, size_t count, u8 rtype) |
289a7162 JK |
200 | { |
201 | struct uhid_device *uhid = hid->driver_data; | |
11c22155 | 202 | struct uhid_get_report_reply_req *req; |
289a7162 | 203 | struct uhid_event *ev; |
289a7162 | 204 | int ret; |
289a7162 JK |
205 | |
206 | if (!uhid->running) | |
207 | return -EIO; | |
208 | ||
11c22155 DH |
209 | ev = kzalloc(sizeof(*ev), GFP_KERNEL); |
210 | if (!ev) | |
211 | return -ENOMEM; | |
212 | ||
213 | ev->type = UHID_GET_REPORT; | |
214 | ev->u.get_report.rnum = rnum; | |
215 | ev->u.get_report.rtype = rtype; | |
289a7162 JK |
216 | |
217 | ret = mutex_lock_interruptible(&uhid->report_lock); | |
11c22155 DH |
218 | if (ret) { |
219 | kfree(ev); | |
289a7162 | 220 | return ret; |
11c22155 | 221 | } |
289a7162 | 222 | |
11c22155 DH |
223 | /* this _always_ takes ownership of @ev */ |
224 | ret = __uhid_report_queue_and_wait(uhid, ev, &ev->u.get_report.id); | |
225 | if (ret) | |
289a7162 | 226 | goto unlock; |
11c22155 DH |
227 | |
228 | req = &uhid->report_buf.u.get_report_reply; | |
229 | if (req->err) { | |
230 | ret = -EIO; | |
231 | } else { | |
232 | ret = min3(count, (size_t)req->size, (size_t)UHID_DATA_MAX); | |
233 | memcpy(buf, req->data, ret); | |
289a7162 JK |
234 | } |
235 | ||
11c22155 DH |
236 | unlock: |
237 | mutex_unlock(&uhid->report_lock); | |
238 | return ret; | |
239 | } | |
289a7162 | 240 | |
11c22155 DH |
241 | static int uhid_hid_set_report(struct hid_device *hid, unsigned char rnum, |
242 | const u8 *buf, size_t count, u8 rtype) | |
243 | { | |
244 | struct uhid_device *uhid = hid->driver_data; | |
245 | struct uhid_event *ev; | |
246 | int ret; | |
289a7162 | 247 | |
11c22155 DH |
248 | if (!uhid->running || count > UHID_DATA_MAX) |
249 | return -EIO; | |
289a7162 | 250 | |
11c22155 DH |
251 | ev = kzalloc(sizeof(*ev), GFP_KERNEL); |
252 | if (!ev) | |
253 | return -ENOMEM; | |
289a7162 | 254 | |
11c22155 DH |
255 | ev->type = UHID_SET_REPORT; |
256 | ev->u.set_report.rnum = rnum; | |
257 | ev->u.set_report.rtype = rtype; | |
258 | ev->u.set_report.size = count; | |
259 | memcpy(ev->u.set_report.data, buf, count); | |
289a7162 | 260 | |
11c22155 DH |
261 | ret = mutex_lock_interruptible(&uhid->report_lock); |
262 | if (ret) { | |
263 | kfree(ev); | |
264 | return ret; | |
289a7162 JK |
265 | } |
266 | ||
11c22155 DH |
267 | /* this _always_ takes ownership of @ev */ |
268 | ret = __uhid_report_queue_and_wait(uhid, ev, &ev->u.set_report.id); | |
269 | if (ret) | |
270 | goto unlock; | |
271 | ||
272 | if (uhid->report_buf.u.set_report_reply.err) | |
273 | ret = -EIO; | |
274 | else | |
275 | ret = count; | |
289a7162 JK |
276 | |
277 | unlock: | |
278 | mutex_unlock(&uhid->report_lock); | |
11c22155 | 279 | return ret; |
289a7162 JK |
280 | } |
281 | ||
7c4003bc DH |
282 | static int uhid_hid_raw_request(struct hid_device *hid, unsigned char reportnum, |
283 | __u8 *buf, size_t len, unsigned char rtype, | |
284 | int reqtype) | |
285 | { | |
11c22155 DH |
286 | u8 u_rtype; |
287 | ||
288 | switch (rtype) { | |
289 | case HID_FEATURE_REPORT: | |
290 | u_rtype = UHID_FEATURE_REPORT; | |
291 | break; | |
292 | case HID_OUTPUT_REPORT: | |
293 | u_rtype = UHID_OUTPUT_REPORT; | |
294 | break; | |
295 | case HID_INPUT_REPORT: | |
296 | u_rtype = UHID_INPUT_REPORT; | |
297 | break; | |
298 | default: | |
299 | return -EINVAL; | |
300 | } | |
301 | ||
7c4003bc DH |
302 | switch (reqtype) { |
303 | case HID_REQ_GET_REPORT: | |
11c22155 | 304 | return uhid_hid_get_report(hid, reportnum, buf, len, u_rtype); |
7c4003bc | 305 | case HID_REQ_SET_REPORT: |
11c22155 | 306 | return uhid_hid_set_report(hid, reportnum, buf, len, u_rtype); |
7c4003bc DH |
307 | default: |
308 | return -EIO; | |
309 | } | |
310 | } | |
311 | ||
d365c6cf DH |
312 | static int uhid_hid_output_raw(struct hid_device *hid, __u8 *buf, size_t count, |
313 | unsigned char report_type) | |
314 | { | |
3b3baa82 DH |
315 | struct uhid_device *uhid = hid->driver_data; |
316 | __u8 rtype; | |
317 | unsigned long flags; | |
318 | struct uhid_event *ev; | |
319 | ||
320 | switch (report_type) { | |
321 | case HID_FEATURE_REPORT: | |
322 | rtype = UHID_FEATURE_REPORT; | |
323 | break; | |
324 | case HID_OUTPUT_REPORT: | |
325 | rtype = UHID_OUTPUT_REPORT; | |
326 | break; | |
327 | default: | |
328 | return -EINVAL; | |
329 | } | |
330 | ||
331 | if (count < 1 || count > UHID_DATA_MAX) | |
332 | return -EINVAL; | |
333 | ||
334 | ev = kzalloc(sizeof(*ev), GFP_KERNEL); | |
335 | if (!ev) | |
336 | return -ENOMEM; | |
337 | ||
338 | ev->type = UHID_OUTPUT; | |
339 | ev->u.output.size = count; | |
340 | ev->u.output.rtype = rtype; | |
341 | memcpy(ev->u.output.data, buf, count); | |
342 | ||
343 | spin_lock_irqsave(&uhid->qlock, flags); | |
344 | uhid_queue(uhid, ev); | |
345 | spin_unlock_irqrestore(&uhid->qlock, flags); | |
346 | ||
347 | return count; | |
d365c6cf DH |
348 | } |
349 | ||
596cfdd8 FP |
350 | static int uhid_hid_output_report(struct hid_device *hid, __u8 *buf, |
351 | size_t count) | |
352 | { | |
41abfb36 | 353 | return uhid_hid_output_raw(hid, buf, count, HID_OUTPUT_REPORT); |
596cfdd8 FP |
354 | } |
355 | ||
d365c6cf DH |
356 | static struct hid_ll_driver uhid_hid_driver = { |
357 | .start = uhid_hid_start, | |
358 | .stop = uhid_hid_stop, | |
359 | .open = uhid_hid_open, | |
360 | .close = uhid_hid_close, | |
d365c6cf | 361 | .parse = uhid_hid_parse, |
7c4003bc | 362 | .raw_request = uhid_hid_raw_request, |
596cfdd8 | 363 | .output_report = uhid_hid_output_report, |
d365c6cf DH |
364 | }; |
365 | ||
befde022 DT |
366 | #ifdef CONFIG_COMPAT |
367 | ||
368 | /* Apparently we haven't stepped on these rakes enough times yet. */ | |
369 | struct uhid_create_req_compat { | |
370 | __u8 name[128]; | |
371 | __u8 phys[64]; | |
372 | __u8 uniq[64]; | |
373 | ||
374 | compat_uptr_t rd_data; | |
375 | __u16 rd_size; | |
376 | ||
377 | __u16 bus; | |
378 | __u32 vendor; | |
379 | __u32 product; | |
380 | __u32 version; | |
381 | __u32 country; | |
382 | } __attribute__((__packed__)); | |
383 | ||
384 | static int uhid_event_from_user(const char __user *buffer, size_t len, | |
385 | struct uhid_event *event) | |
386 | { | |
387 | if (is_compat_task()) { | |
388 | u32 type; | |
389 | ||
390 | if (get_user(type, buffer)) | |
391 | return -EFAULT; | |
392 | ||
393 | if (type == UHID_CREATE) { | |
394 | /* | |
395 | * This is our messed up request with compat pointer. | |
396 | * It is largish (more than 256 bytes) so we better | |
397 | * allocate it from the heap. | |
398 | */ | |
399 | struct uhid_create_req_compat *compat; | |
400 | ||
80897aa7 | 401 | compat = kzalloc(sizeof(*compat), GFP_KERNEL); |
befde022 DT |
402 | if (!compat) |
403 | return -ENOMEM; | |
404 | ||
405 | buffer += sizeof(type); | |
406 | len -= sizeof(type); | |
407 | if (copy_from_user(compat, buffer, | |
408 | min(len, sizeof(*compat)))) { | |
409 | kfree(compat); | |
410 | return -EFAULT; | |
411 | } | |
412 | ||
413 | /* Shuffle the data over to proper structure */ | |
414 | event->type = type; | |
415 | ||
416 | memcpy(event->u.create.name, compat->name, | |
417 | sizeof(compat->name)); | |
418 | memcpy(event->u.create.phys, compat->phys, | |
419 | sizeof(compat->phys)); | |
420 | memcpy(event->u.create.uniq, compat->uniq, | |
421 | sizeof(compat->uniq)); | |
422 | ||
423 | event->u.create.rd_data = compat_ptr(compat->rd_data); | |
424 | event->u.create.rd_size = compat->rd_size; | |
425 | ||
426 | event->u.create.bus = compat->bus; | |
427 | event->u.create.vendor = compat->vendor; | |
428 | event->u.create.product = compat->product; | |
429 | event->u.create.version = compat->version; | |
430 | event->u.create.country = compat->country; | |
431 | ||
432 | kfree(compat); | |
433 | return 0; | |
434 | } | |
435 | /* All others can be copied directly */ | |
436 | } | |
437 | ||
438 | if (copy_from_user(event, buffer, min(len, sizeof(*event)))) | |
439 | return -EFAULT; | |
440 | ||
441 | return 0; | |
442 | } | |
443 | #else | |
444 | static int uhid_event_from_user(const char __user *buffer, size_t len, | |
445 | struct uhid_event *event) | |
446 | { | |
447 | if (copy_from_user(event, buffer, min(len, sizeof(*event)))) | |
448 | return -EFAULT; | |
449 | ||
450 | return 0; | |
451 | } | |
452 | #endif | |
453 | ||
4522643a PG |
454 | static int uhid_dev_create2(struct uhid_device *uhid, |
455 | const struct uhid_event *ev) | |
456 | { | |
457 | struct hid_device *hid; | |
25be7fe2 | 458 | size_t rd_size, len; |
41c4a464 | 459 | void *rd_data; |
4522643a PG |
460 | int ret; |
461 | ||
462 | if (uhid->running) | |
463 | return -EALREADY; | |
464 | ||
41c4a464 DH |
465 | rd_size = ev->u.create2.rd_size; |
466 | if (rd_size <= 0 || rd_size > HID_MAX_DESCRIPTOR_SIZE) | |
4522643a PG |
467 | return -EINVAL; |
468 | ||
41c4a464 DH |
469 | rd_data = kmemdup(ev->u.create2.rd_data, rd_size, GFP_KERNEL); |
470 | if (!rd_data) | |
4522643a PG |
471 | return -ENOMEM; |
472 | ||
41c4a464 DH |
473 | uhid->rd_size = rd_size; |
474 | uhid->rd_data = rd_data; | |
475 | ||
4522643a PG |
476 | hid = hid_allocate_device(); |
477 | if (IS_ERR(hid)) { | |
478 | ret = PTR_ERR(hid); | |
479 | goto err_free; | |
480 | } | |
481 | ||
25be7fe2 DH |
482 | len = min(sizeof(hid->name), sizeof(ev->u.create2.name)) - 1; |
483 | strncpy(hid->name, ev->u.create2.name, len); | |
484 | len = min(sizeof(hid->phys), sizeof(ev->u.create2.phys)) - 1; | |
485 | strncpy(hid->phys, ev->u.create2.phys, len); | |
486 | len = min(sizeof(hid->uniq), sizeof(ev->u.create2.uniq)) - 1; | |
487 | strncpy(hid->uniq, ev->u.create2.uniq, len); | |
4522643a PG |
488 | |
489 | hid->ll_driver = &uhid_hid_driver; | |
490 | hid->bus = ev->u.create2.bus; | |
491 | hid->vendor = ev->u.create2.vendor; | |
492 | hid->product = ev->u.create2.product; | |
493 | hid->version = ev->u.create2.version; | |
494 | hid->country = ev->u.create2.country; | |
495 | hid->driver_data = uhid; | |
496 | hid->dev.parent = uhid_misc.this_device; | |
497 | ||
498 | uhid->hid = hid; | |
499 | uhid->running = true; | |
500 | ||
501 | ret = hid_add_device(hid); | |
502 | if (ret) { | |
503 | hid_err(hid, "Cannot register HID device\n"); | |
504 | goto err_hid; | |
505 | } | |
506 | ||
507 | return 0; | |
508 | ||
509 | err_hid: | |
510 | hid_destroy_device(hid); | |
511 | uhid->hid = NULL; | |
512 | uhid->running = false; | |
513 | err_free: | |
514 | kfree(uhid->rd_data); | |
41c4a464 DH |
515 | uhid->rd_data = NULL; |
516 | uhid->rd_size = 0; | |
4522643a PG |
517 | return ret; |
518 | } | |
519 | ||
56c47754 DH |
520 | static int uhid_dev_create(struct uhid_device *uhid, |
521 | struct uhid_event *ev) | |
522 | { | |
523 | struct uhid_create_req orig; | |
524 | ||
525 | orig = ev->u.create; | |
526 | ||
527 | if (orig.rd_size <= 0 || orig.rd_size > HID_MAX_DESCRIPTOR_SIZE) | |
528 | return -EINVAL; | |
529 | if (copy_from_user(&ev->u.create2.rd_data, orig.rd_data, orig.rd_size)) | |
530 | return -EFAULT; | |
531 | ||
532 | memcpy(ev->u.create2.name, orig.name, sizeof(orig.name)); | |
533 | memcpy(ev->u.create2.phys, orig.phys, sizeof(orig.phys)); | |
534 | memcpy(ev->u.create2.uniq, orig.uniq, sizeof(orig.uniq)); | |
535 | ev->u.create2.rd_size = orig.rd_size; | |
536 | ev->u.create2.bus = orig.bus; | |
537 | ev->u.create2.vendor = orig.vendor; | |
538 | ev->u.create2.product = orig.product; | |
539 | ev->u.create2.version = orig.version; | |
540 | ev->u.create2.country = orig.country; | |
541 | ||
542 | return uhid_dev_create2(uhid, ev); | |
543 | } | |
544 | ||
d365c6cf DH |
545 | static int uhid_dev_destroy(struct uhid_device *uhid) |
546 | { | |
547 | if (!uhid->running) | |
548 | return -EINVAL; | |
549 | ||
550 | uhid->running = false; | |
fcfcf0de | 551 | wake_up_interruptible(&uhid->report_wait); |
d365c6cf DH |
552 | |
553 | hid_destroy_device(uhid->hid); | |
554 | kfree(uhid->rd_data); | |
555 | ||
556 | return 0; | |
557 | } | |
558 | ||
5e87a36a DH |
559 | static int uhid_dev_input(struct uhid_device *uhid, struct uhid_event *ev) |
560 | { | |
561 | if (!uhid->running) | |
562 | return -EINVAL; | |
563 | ||
564 | hid_input_report(uhid->hid, HID_INPUT_REPORT, ev->u.input.data, | |
565 | min_t(size_t, ev->u.input.size, UHID_DATA_MAX), 0); | |
566 | ||
567 | return 0; | |
568 | } | |
569 | ||
4522643a PG |
570 | static int uhid_dev_input2(struct uhid_device *uhid, struct uhid_event *ev) |
571 | { | |
572 | if (!uhid->running) | |
573 | return -EINVAL; | |
574 | ||
575 | hid_input_report(uhid->hid, HID_INPUT_REPORT, ev->u.input2.data, | |
576 | min_t(size_t, ev->u.input2.size, UHID_DATA_MAX), 0); | |
577 | ||
578 | return 0; | |
579 | } | |
580 | ||
fa71f32b DH |
581 | static int uhid_dev_get_report_reply(struct uhid_device *uhid, |
582 | struct uhid_event *ev) | |
fcfcf0de | 583 | { |
fcfcf0de DH |
584 | if (!uhid->running) |
585 | return -EINVAL; | |
586 | ||
11c22155 DH |
587 | uhid_report_wake_up(uhid, ev->u.get_report_reply.id, ev); |
588 | return 0; | |
589 | } | |
fcfcf0de | 590 | |
11c22155 DH |
591 | static int uhid_dev_set_report_reply(struct uhid_device *uhid, |
592 | struct uhid_event *ev) | |
593 | { | |
594 | if (!uhid->running) | |
595 | return -EINVAL; | |
fcfcf0de | 596 | |
11c22155 | 597 | uhid_report_wake_up(uhid, ev->u.set_report_reply.id, ev); |
fcfcf0de DH |
598 | return 0; |
599 | } | |
600 | ||
1ccd7a2a DH |
601 | static int uhid_char_open(struct inode *inode, struct file *file) |
602 | { | |
ace3d861 DH |
603 | struct uhid_device *uhid; |
604 | ||
605 | uhid = kzalloc(sizeof(*uhid), GFP_KERNEL); | |
606 | if (!uhid) | |
607 | return -ENOMEM; | |
608 | ||
d937ae5f | 609 | mutex_init(&uhid->devlock); |
fcfcf0de | 610 | mutex_init(&uhid->report_lock); |
ace3d861 DH |
611 | spin_lock_init(&uhid->qlock); |
612 | init_waitqueue_head(&uhid->waitq); | |
fcfcf0de | 613 | init_waitqueue_head(&uhid->report_wait); |
d365c6cf | 614 | uhid->running = false; |
ace3d861 DH |
615 | |
616 | file->private_data = uhid; | |
617 | nonseekable_open(inode, file); | |
618 | ||
1ccd7a2a DH |
619 | return 0; |
620 | } | |
621 | ||
622 | static int uhid_char_release(struct inode *inode, struct file *file) | |
623 | { | |
ace3d861 DH |
624 | struct uhid_device *uhid = file->private_data; |
625 | unsigned int i; | |
626 | ||
d365c6cf DH |
627 | uhid_dev_destroy(uhid); |
628 | ||
ace3d861 DH |
629 | for (i = 0; i < UHID_BUFSIZE; ++i) |
630 | kfree(uhid->outq[i]); | |
631 | ||
632 | kfree(uhid); | |
633 | ||
1ccd7a2a DH |
634 | return 0; |
635 | } | |
636 | ||
637 | static ssize_t uhid_char_read(struct file *file, char __user *buffer, | |
638 | size_t count, loff_t *ppos) | |
639 | { | |
d937ae5f DH |
640 | struct uhid_device *uhid = file->private_data; |
641 | int ret; | |
642 | unsigned long flags; | |
643 | size_t len; | |
644 | ||
645 | /* they need at least the "type" member of uhid_event */ | |
646 | if (count < sizeof(__u32)) | |
647 | return -EINVAL; | |
648 | ||
649 | try_again: | |
650 | if (file->f_flags & O_NONBLOCK) { | |
651 | if (uhid->head == uhid->tail) | |
652 | return -EAGAIN; | |
653 | } else { | |
654 | ret = wait_event_interruptible(uhid->waitq, | |
655 | uhid->head != uhid->tail); | |
656 | if (ret) | |
657 | return ret; | |
658 | } | |
659 | ||
660 | ret = mutex_lock_interruptible(&uhid->devlock); | |
661 | if (ret) | |
662 | return ret; | |
663 | ||
664 | if (uhid->head == uhid->tail) { | |
665 | mutex_unlock(&uhid->devlock); | |
666 | goto try_again; | |
667 | } else { | |
668 | len = min(count, sizeof(**uhid->outq)); | |
adefb69b | 669 | if (copy_to_user(buffer, uhid->outq[uhid->tail], len)) { |
d937ae5f DH |
670 | ret = -EFAULT; |
671 | } else { | |
672 | kfree(uhid->outq[uhid->tail]); | |
673 | uhid->outq[uhid->tail] = NULL; | |
674 | ||
675 | spin_lock_irqsave(&uhid->qlock, flags); | |
676 | uhid->tail = (uhid->tail + 1) % UHID_BUFSIZE; | |
677 | spin_unlock_irqrestore(&uhid->qlock, flags); | |
678 | } | |
679 | } | |
680 | ||
681 | mutex_unlock(&uhid->devlock); | |
682 | return ret ? ret : len; | |
1ccd7a2a DH |
683 | } |
684 | ||
685 | static ssize_t uhid_char_write(struct file *file, const char __user *buffer, | |
686 | size_t count, loff_t *ppos) | |
687 | { | |
6664ef72 DH |
688 | struct uhid_device *uhid = file->private_data; |
689 | int ret; | |
690 | size_t len; | |
691 | ||
692 | /* we need at least the "type" member of uhid_event */ | |
693 | if (count < sizeof(__u32)) | |
694 | return -EINVAL; | |
695 | ||
696 | ret = mutex_lock_interruptible(&uhid->devlock); | |
697 | if (ret) | |
698 | return ret; | |
699 | ||
700 | memset(&uhid->input_buf, 0, sizeof(uhid->input_buf)); | |
701 | len = min(count, sizeof(uhid->input_buf)); | |
befde022 DT |
702 | |
703 | ret = uhid_event_from_user(buffer, len, &uhid->input_buf); | |
704 | if (ret) | |
6664ef72 | 705 | goto unlock; |
6664ef72 DH |
706 | |
707 | switch (uhid->input_buf.type) { | |
d365c6cf DH |
708 | case UHID_CREATE: |
709 | ret = uhid_dev_create(uhid, &uhid->input_buf); | |
710 | break; | |
4522643a PG |
711 | case UHID_CREATE2: |
712 | ret = uhid_dev_create2(uhid, &uhid->input_buf); | |
713 | break; | |
d365c6cf DH |
714 | case UHID_DESTROY: |
715 | ret = uhid_dev_destroy(uhid); | |
716 | break; | |
5e87a36a DH |
717 | case UHID_INPUT: |
718 | ret = uhid_dev_input(uhid, &uhid->input_buf); | |
719 | break; | |
4522643a PG |
720 | case UHID_INPUT2: |
721 | ret = uhid_dev_input2(uhid, &uhid->input_buf); | |
722 | break; | |
fa71f32b DH |
723 | case UHID_GET_REPORT_REPLY: |
724 | ret = uhid_dev_get_report_reply(uhid, &uhid->input_buf); | |
fcfcf0de | 725 | break; |
11c22155 DH |
726 | case UHID_SET_REPORT_REPLY: |
727 | ret = uhid_dev_set_report_reply(uhid, &uhid->input_buf); | |
728 | break; | |
6664ef72 DH |
729 | default: |
730 | ret = -EOPNOTSUPP; | |
731 | } | |
732 | ||
733 | unlock: | |
734 | mutex_unlock(&uhid->devlock); | |
735 | ||
736 | /* return "count" not "len" to not confuse the caller */ | |
737 | return ret ? ret : count; | |
1ccd7a2a DH |
738 | } |
739 | ||
740 | static unsigned int uhid_char_poll(struct file *file, poll_table *wait) | |
741 | { | |
1f9dec1e DH |
742 | struct uhid_device *uhid = file->private_data; |
743 | ||
744 | poll_wait(file, &uhid->waitq, wait); | |
745 | ||
746 | if (uhid->head != uhid->tail) | |
747 | return POLLIN | POLLRDNORM; | |
748 | ||
1ccd7a2a DH |
749 | return 0; |
750 | } | |
751 | ||
752 | static const struct file_operations uhid_fops = { | |
753 | .owner = THIS_MODULE, | |
754 | .open = uhid_char_open, | |
755 | .release = uhid_char_release, | |
756 | .read = uhid_char_read, | |
757 | .write = uhid_char_write, | |
758 | .poll = uhid_char_poll, | |
759 | .llseek = no_llseek, | |
760 | }; | |
761 | ||
762 | static struct miscdevice uhid_misc = { | |
763 | .fops = &uhid_fops, | |
19872d20 | 764 | .minor = UHID_MINOR, |
1ccd7a2a DH |
765 | .name = UHID_NAME, |
766 | }; | |
767 | ||
768 | static int __init uhid_init(void) | |
769 | { | |
770 | return misc_register(&uhid_misc); | |
771 | } | |
772 | ||
773 | static void __exit uhid_exit(void) | |
774 | { | |
775 | misc_deregister(&uhid_misc); | |
776 | } | |
777 | ||
778 | module_init(uhid_init); | |
779 | module_exit(uhid_exit); | |
780 | MODULE_LICENSE("GPL"); | |
781 | MODULE_AUTHOR("David Herrmann <dh.herrmann@gmail.com>"); | |
782 | MODULE_DESCRIPTION("User-space I/O driver support for HID subsystem"); | |
19872d20 | 783 | MODULE_ALIAS_MISCDEV(UHID_MINOR); |
60cbd53e | 784 | MODULE_ALIAS("devname:" UHID_NAME); |