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; |
67f8ecc5 | 54 | struct work_struct worker; |
ace3d861 | 55 | }; |
1ccd7a2a DH |
56 | |
57 | static struct miscdevice uhid_misc; | |
58 | ||
67f8ecc5 RC |
59 | static void uhid_device_add_worker(struct work_struct *work) |
60 | { | |
61 | struct uhid_device *uhid = container_of(work, struct uhid_device, worker); | |
62 | int ret; | |
63 | ||
64 | ret = hid_add_device(uhid->hid); | |
65 | if (ret) { | |
66 | hid_err(uhid->hid, "Cannot register HID device: error %d\n", ret); | |
67 | ||
68 | hid_destroy_device(uhid->hid); | |
69 | uhid->hid = NULL; | |
70 | uhid->running = false; | |
71 | } | |
72 | } | |
73 | ||
ace3d861 DH |
74 | static void uhid_queue(struct uhid_device *uhid, struct uhid_event *ev) |
75 | { | |
76 | __u8 newhead; | |
77 | ||
78 | newhead = (uhid->head + 1) % UHID_BUFSIZE; | |
79 | ||
80 | if (newhead != uhid->tail) { | |
81 | uhid->outq[uhid->head] = ev; | |
82 | uhid->head = newhead; | |
83 | wake_up_interruptible(&uhid->waitq); | |
84 | } else { | |
85 | hid_warn(uhid->hid, "Output queue is full\n"); | |
86 | kfree(ev); | |
87 | } | |
88 | } | |
89 | ||
90 | static int uhid_queue_event(struct uhid_device *uhid, __u32 event) | |
91 | { | |
92 | unsigned long flags; | |
93 | struct uhid_event *ev; | |
94 | ||
95 | ev = kzalloc(sizeof(*ev), GFP_KERNEL); | |
96 | if (!ev) | |
97 | return -ENOMEM; | |
98 | ||
99 | ev->type = event; | |
100 | ||
101 | spin_lock_irqsave(&uhid->qlock, flags); | |
102 | uhid_queue(uhid, ev); | |
103 | spin_unlock_irqrestore(&uhid->qlock, flags); | |
104 | ||
105 | return 0; | |
106 | } | |
107 | ||
d365c6cf DH |
108 | static int uhid_hid_start(struct hid_device *hid) |
109 | { | |
ec4b7dea | 110 | struct uhid_device *uhid = hid->driver_data; |
c2b2f16c DH |
111 | struct uhid_event *ev; |
112 | unsigned long flags; | |
113 | ||
114 | ev = kzalloc(sizeof(*ev), GFP_KERNEL); | |
115 | if (!ev) | |
116 | return -ENOMEM; | |
117 | ||
118 | ev->type = UHID_START; | |
ec4b7dea | 119 | |
c2b2f16c DH |
120 | if (hid->report_enum[HID_FEATURE_REPORT].numbered) |
121 | ev->u.start.dev_flags |= UHID_DEV_NUMBERED_FEATURE_REPORTS; | |
122 | if (hid->report_enum[HID_OUTPUT_REPORT].numbered) | |
123 | ev->u.start.dev_flags |= UHID_DEV_NUMBERED_OUTPUT_REPORTS; | |
124 | if (hid->report_enum[HID_INPUT_REPORT].numbered) | |
125 | ev->u.start.dev_flags |= UHID_DEV_NUMBERED_INPUT_REPORTS; | |
126 | ||
127 | spin_lock_irqsave(&uhid->qlock, flags); | |
128 | uhid_queue(uhid, ev); | |
129 | spin_unlock_irqrestore(&uhid->qlock, flags); | |
130 | ||
131 | return 0; | |
d365c6cf DH |
132 | } |
133 | ||
134 | static void uhid_hid_stop(struct hid_device *hid) | |
135 | { | |
ec4b7dea DH |
136 | struct uhid_device *uhid = hid->driver_data; |
137 | ||
138 | hid->claimed = 0; | |
139 | uhid_queue_event(uhid, UHID_STOP); | |
d365c6cf DH |
140 | } |
141 | ||
142 | static int uhid_hid_open(struct hid_device *hid) | |
143 | { | |
e7191474 DH |
144 | struct uhid_device *uhid = hid->driver_data; |
145 | ||
146 | return uhid_queue_event(uhid, UHID_OPEN); | |
d365c6cf DH |
147 | } |
148 | ||
149 | static void uhid_hid_close(struct hid_device *hid) | |
150 | { | |
e7191474 DH |
151 | struct uhid_device *uhid = hid->driver_data; |
152 | ||
153 | uhid_queue_event(uhid, UHID_CLOSE); | |
d365c6cf DH |
154 | } |
155 | ||
d365c6cf DH |
156 | static int uhid_hid_parse(struct hid_device *hid) |
157 | { | |
037c061b DH |
158 | struct uhid_device *uhid = hid->driver_data; |
159 | ||
160 | return hid_parse_report(hid, uhid->rd_data, uhid->rd_size); | |
d365c6cf DH |
161 | } |
162 | ||
11c22155 DH |
163 | /* must be called with report_lock held */ |
164 | static int __uhid_report_queue_and_wait(struct uhid_device *uhid, | |
165 | struct uhid_event *ev, | |
166 | __u32 *report_id) | |
167 | { | |
168 | unsigned long flags; | |
169 | int ret; | |
170 | ||
171 | spin_lock_irqsave(&uhid->qlock, flags); | |
172 | *report_id = ++uhid->report_id; | |
8493ecca | 173 | uhid->report_type = ev->type + 1; |
11c22155 DH |
174 | uhid->report_running = true; |
175 | uhid_queue(uhid, ev); | |
176 | spin_unlock_irqrestore(&uhid->qlock, flags); | |
177 | ||
178 | ret = wait_event_interruptible_timeout(uhid->report_wait, | |
179 | !uhid->report_running || !uhid->running, | |
180 | 5 * HZ); | |
181 | if (!ret || !uhid->running || uhid->report_running) | |
182 | ret = -EIO; | |
183 | else if (ret < 0) | |
184 | ret = -ERESTARTSYS; | |
185 | else | |
186 | ret = 0; | |
187 | ||
188 | uhid->report_running = false; | |
189 | ||
190 | return ret; | |
191 | } | |
192 | ||
193 | static void uhid_report_wake_up(struct uhid_device *uhid, u32 id, | |
194 | const struct uhid_event *ev) | |
195 | { | |
196 | unsigned long flags; | |
197 | ||
198 | spin_lock_irqsave(&uhid->qlock, flags); | |
199 | ||
200 | /* id for old report; drop it silently */ | |
201 | if (uhid->report_type != ev->type || uhid->report_id != id) | |
202 | goto unlock; | |
203 | if (!uhid->report_running) | |
204 | goto unlock; | |
205 | ||
206 | memcpy(&uhid->report_buf, ev, sizeof(*ev)); | |
207 | uhid->report_running = false; | |
208 | wake_up_interruptible(&uhid->report_wait); | |
209 | ||
210 | unlock: | |
211 | spin_unlock_irqrestore(&uhid->qlock, flags); | |
212 | } | |
213 | ||
fa71f32b | 214 | static int uhid_hid_get_report(struct hid_device *hid, unsigned char rnum, |
11c22155 | 215 | u8 *buf, size_t count, u8 rtype) |
289a7162 JK |
216 | { |
217 | struct uhid_device *uhid = hid->driver_data; | |
11c22155 | 218 | struct uhid_get_report_reply_req *req; |
289a7162 | 219 | struct uhid_event *ev; |
289a7162 | 220 | int ret; |
289a7162 JK |
221 | |
222 | if (!uhid->running) | |
223 | return -EIO; | |
224 | ||
11c22155 DH |
225 | ev = kzalloc(sizeof(*ev), GFP_KERNEL); |
226 | if (!ev) | |
227 | return -ENOMEM; | |
228 | ||
229 | ev->type = UHID_GET_REPORT; | |
230 | ev->u.get_report.rnum = rnum; | |
231 | ev->u.get_report.rtype = rtype; | |
289a7162 JK |
232 | |
233 | ret = mutex_lock_interruptible(&uhid->report_lock); | |
11c22155 DH |
234 | if (ret) { |
235 | kfree(ev); | |
289a7162 | 236 | return ret; |
11c22155 | 237 | } |
289a7162 | 238 | |
11c22155 DH |
239 | /* this _always_ takes ownership of @ev */ |
240 | ret = __uhid_report_queue_and_wait(uhid, ev, &ev->u.get_report.id); | |
241 | if (ret) | |
289a7162 | 242 | goto unlock; |
11c22155 DH |
243 | |
244 | req = &uhid->report_buf.u.get_report_reply; | |
245 | if (req->err) { | |
246 | ret = -EIO; | |
247 | } else { | |
248 | ret = min3(count, (size_t)req->size, (size_t)UHID_DATA_MAX); | |
249 | memcpy(buf, req->data, ret); | |
289a7162 JK |
250 | } |
251 | ||
11c22155 DH |
252 | unlock: |
253 | mutex_unlock(&uhid->report_lock); | |
254 | return ret; | |
255 | } | |
289a7162 | 256 | |
11c22155 DH |
257 | static int uhid_hid_set_report(struct hid_device *hid, unsigned char rnum, |
258 | const u8 *buf, size_t count, u8 rtype) | |
259 | { | |
260 | struct uhid_device *uhid = hid->driver_data; | |
261 | struct uhid_event *ev; | |
262 | int ret; | |
289a7162 | 263 | |
11c22155 DH |
264 | if (!uhid->running || count > UHID_DATA_MAX) |
265 | return -EIO; | |
289a7162 | 266 | |
11c22155 DH |
267 | ev = kzalloc(sizeof(*ev), GFP_KERNEL); |
268 | if (!ev) | |
269 | return -ENOMEM; | |
289a7162 | 270 | |
11c22155 DH |
271 | ev->type = UHID_SET_REPORT; |
272 | ev->u.set_report.rnum = rnum; | |
273 | ev->u.set_report.rtype = rtype; | |
274 | ev->u.set_report.size = count; | |
275 | memcpy(ev->u.set_report.data, buf, count); | |
289a7162 | 276 | |
11c22155 DH |
277 | ret = mutex_lock_interruptible(&uhid->report_lock); |
278 | if (ret) { | |
279 | kfree(ev); | |
280 | return ret; | |
289a7162 JK |
281 | } |
282 | ||
11c22155 DH |
283 | /* this _always_ takes ownership of @ev */ |
284 | ret = __uhid_report_queue_and_wait(uhid, ev, &ev->u.set_report.id); | |
285 | if (ret) | |
286 | goto unlock; | |
287 | ||
288 | if (uhid->report_buf.u.set_report_reply.err) | |
289 | ret = -EIO; | |
290 | else | |
291 | ret = count; | |
289a7162 JK |
292 | |
293 | unlock: | |
294 | mutex_unlock(&uhid->report_lock); | |
11c22155 | 295 | return ret; |
289a7162 JK |
296 | } |
297 | ||
7c4003bc DH |
298 | static int uhid_hid_raw_request(struct hid_device *hid, unsigned char reportnum, |
299 | __u8 *buf, size_t len, unsigned char rtype, | |
300 | int reqtype) | |
301 | { | |
11c22155 DH |
302 | u8 u_rtype; |
303 | ||
304 | switch (rtype) { | |
305 | case HID_FEATURE_REPORT: | |
306 | u_rtype = UHID_FEATURE_REPORT; | |
307 | break; | |
308 | case HID_OUTPUT_REPORT: | |
309 | u_rtype = UHID_OUTPUT_REPORT; | |
310 | break; | |
311 | case HID_INPUT_REPORT: | |
312 | u_rtype = UHID_INPUT_REPORT; | |
313 | break; | |
314 | default: | |
315 | return -EINVAL; | |
316 | } | |
317 | ||
7c4003bc DH |
318 | switch (reqtype) { |
319 | case HID_REQ_GET_REPORT: | |
11c22155 | 320 | return uhid_hid_get_report(hid, reportnum, buf, len, u_rtype); |
7c4003bc | 321 | case HID_REQ_SET_REPORT: |
11c22155 | 322 | return uhid_hid_set_report(hid, reportnum, buf, len, u_rtype); |
7c4003bc DH |
323 | default: |
324 | return -EIO; | |
325 | } | |
326 | } | |
327 | ||
d365c6cf DH |
328 | static int uhid_hid_output_raw(struct hid_device *hid, __u8 *buf, size_t count, |
329 | unsigned char report_type) | |
330 | { | |
3b3baa82 DH |
331 | struct uhid_device *uhid = hid->driver_data; |
332 | __u8 rtype; | |
333 | unsigned long flags; | |
334 | struct uhid_event *ev; | |
335 | ||
336 | switch (report_type) { | |
337 | case HID_FEATURE_REPORT: | |
338 | rtype = UHID_FEATURE_REPORT; | |
339 | break; | |
340 | case HID_OUTPUT_REPORT: | |
341 | rtype = UHID_OUTPUT_REPORT; | |
342 | break; | |
343 | default: | |
344 | return -EINVAL; | |
345 | } | |
346 | ||
347 | if (count < 1 || count > UHID_DATA_MAX) | |
348 | return -EINVAL; | |
349 | ||
350 | ev = kzalloc(sizeof(*ev), GFP_KERNEL); | |
351 | if (!ev) | |
352 | return -ENOMEM; | |
353 | ||
354 | ev->type = UHID_OUTPUT; | |
355 | ev->u.output.size = count; | |
356 | ev->u.output.rtype = rtype; | |
357 | memcpy(ev->u.output.data, buf, count); | |
358 | ||
359 | spin_lock_irqsave(&uhid->qlock, flags); | |
360 | uhid_queue(uhid, ev); | |
361 | spin_unlock_irqrestore(&uhid->qlock, flags); | |
362 | ||
363 | return count; | |
d365c6cf DH |
364 | } |
365 | ||
596cfdd8 FP |
366 | static int uhid_hid_output_report(struct hid_device *hid, __u8 *buf, |
367 | size_t count) | |
368 | { | |
41abfb36 | 369 | return uhid_hid_output_raw(hid, buf, count, HID_OUTPUT_REPORT); |
596cfdd8 FP |
370 | } |
371 | ||
fc2237a7 | 372 | struct hid_ll_driver uhid_hid_driver = { |
d365c6cf DH |
373 | .start = uhid_hid_start, |
374 | .stop = uhid_hid_stop, | |
375 | .open = uhid_hid_open, | |
376 | .close = uhid_hid_close, | |
d365c6cf | 377 | .parse = uhid_hid_parse, |
7c4003bc | 378 | .raw_request = uhid_hid_raw_request, |
596cfdd8 | 379 | .output_report = uhid_hid_output_report, |
d365c6cf | 380 | }; |
fc2237a7 | 381 | EXPORT_SYMBOL_GPL(uhid_hid_driver); |
d365c6cf | 382 | |
befde022 DT |
383 | #ifdef CONFIG_COMPAT |
384 | ||
385 | /* Apparently we haven't stepped on these rakes enough times yet. */ | |
386 | struct uhid_create_req_compat { | |
387 | __u8 name[128]; | |
388 | __u8 phys[64]; | |
389 | __u8 uniq[64]; | |
390 | ||
391 | compat_uptr_t rd_data; | |
392 | __u16 rd_size; | |
393 | ||
394 | __u16 bus; | |
395 | __u32 vendor; | |
396 | __u32 product; | |
397 | __u32 version; | |
398 | __u32 country; | |
399 | } __attribute__((__packed__)); | |
400 | ||
401 | static int uhid_event_from_user(const char __user *buffer, size_t len, | |
402 | struct uhid_event *event) | |
403 | { | |
7365abba | 404 | if (in_compat_syscall()) { |
befde022 DT |
405 | u32 type; |
406 | ||
407 | if (get_user(type, buffer)) | |
408 | return -EFAULT; | |
409 | ||
410 | if (type == UHID_CREATE) { | |
411 | /* | |
412 | * This is our messed up request with compat pointer. | |
413 | * It is largish (more than 256 bytes) so we better | |
414 | * allocate it from the heap. | |
415 | */ | |
416 | struct uhid_create_req_compat *compat; | |
417 | ||
80897aa7 | 418 | compat = kzalloc(sizeof(*compat), GFP_KERNEL); |
befde022 DT |
419 | if (!compat) |
420 | return -ENOMEM; | |
421 | ||
422 | buffer += sizeof(type); | |
423 | len -= sizeof(type); | |
424 | if (copy_from_user(compat, buffer, | |
425 | min(len, sizeof(*compat)))) { | |
426 | kfree(compat); | |
427 | return -EFAULT; | |
428 | } | |
429 | ||
430 | /* Shuffle the data over to proper structure */ | |
431 | event->type = type; | |
432 | ||
433 | memcpy(event->u.create.name, compat->name, | |
434 | sizeof(compat->name)); | |
435 | memcpy(event->u.create.phys, compat->phys, | |
436 | sizeof(compat->phys)); | |
437 | memcpy(event->u.create.uniq, compat->uniq, | |
438 | sizeof(compat->uniq)); | |
439 | ||
440 | event->u.create.rd_data = compat_ptr(compat->rd_data); | |
441 | event->u.create.rd_size = compat->rd_size; | |
442 | ||
443 | event->u.create.bus = compat->bus; | |
444 | event->u.create.vendor = compat->vendor; | |
445 | event->u.create.product = compat->product; | |
446 | event->u.create.version = compat->version; | |
447 | event->u.create.country = compat->country; | |
448 | ||
449 | kfree(compat); | |
450 | return 0; | |
451 | } | |
452 | /* All others can be copied directly */ | |
453 | } | |
454 | ||
455 | if (copy_from_user(event, buffer, min(len, sizeof(*event)))) | |
456 | return -EFAULT; | |
457 | ||
458 | return 0; | |
459 | } | |
460 | #else | |
461 | static int uhid_event_from_user(const char __user *buffer, size_t len, | |
462 | struct uhid_event *event) | |
463 | { | |
464 | if (copy_from_user(event, buffer, min(len, sizeof(*event)))) | |
465 | return -EFAULT; | |
466 | ||
467 | return 0; | |
468 | } | |
469 | #endif | |
470 | ||
4522643a PG |
471 | static int uhid_dev_create2(struct uhid_device *uhid, |
472 | const struct uhid_event *ev) | |
473 | { | |
474 | struct hid_device *hid; | |
25be7fe2 | 475 | size_t rd_size, len; |
41c4a464 | 476 | void *rd_data; |
4522643a PG |
477 | int ret; |
478 | ||
479 | if (uhid->running) | |
480 | return -EALREADY; | |
481 | ||
41c4a464 DH |
482 | rd_size = ev->u.create2.rd_size; |
483 | if (rd_size <= 0 || rd_size > HID_MAX_DESCRIPTOR_SIZE) | |
4522643a PG |
484 | return -EINVAL; |
485 | ||
41c4a464 DH |
486 | rd_data = kmemdup(ev->u.create2.rd_data, rd_size, GFP_KERNEL); |
487 | if (!rd_data) | |
4522643a PG |
488 | return -ENOMEM; |
489 | ||
41c4a464 DH |
490 | uhid->rd_size = rd_size; |
491 | uhid->rd_data = rd_data; | |
492 | ||
4522643a PG |
493 | hid = hid_allocate_device(); |
494 | if (IS_ERR(hid)) { | |
495 | ret = PTR_ERR(hid); | |
496 | goto err_free; | |
497 | } | |
498 | ||
25be7fe2 DH |
499 | len = min(sizeof(hid->name), sizeof(ev->u.create2.name)) - 1; |
500 | strncpy(hid->name, ev->u.create2.name, len); | |
501 | len = min(sizeof(hid->phys), sizeof(ev->u.create2.phys)) - 1; | |
502 | strncpy(hid->phys, ev->u.create2.phys, len); | |
503 | len = min(sizeof(hid->uniq), sizeof(ev->u.create2.uniq)) - 1; | |
504 | strncpy(hid->uniq, ev->u.create2.uniq, len); | |
4522643a PG |
505 | |
506 | hid->ll_driver = &uhid_hid_driver; | |
507 | hid->bus = ev->u.create2.bus; | |
508 | hid->vendor = ev->u.create2.vendor; | |
509 | hid->product = ev->u.create2.product; | |
510 | hid->version = ev->u.create2.version; | |
511 | hid->country = ev->u.create2.country; | |
512 | hid->driver_data = uhid; | |
513 | hid->dev.parent = uhid_misc.this_device; | |
514 | ||
515 | uhid->hid = hid; | |
516 | uhid->running = true; | |
517 | ||
67f8ecc5 RC |
518 | /* Adding of a HID device is done through a worker, to allow HID drivers |
519 | * which use feature requests during .probe to work, without they would | |
520 | * be blocked on devlock, which is held by uhid_char_write. | |
521 | */ | |
522 | schedule_work(&uhid->worker); | |
4522643a PG |
523 | |
524 | return 0; | |
525 | ||
4522643a PG |
526 | err_free: |
527 | kfree(uhid->rd_data); | |
41c4a464 DH |
528 | uhid->rd_data = NULL; |
529 | uhid->rd_size = 0; | |
4522643a PG |
530 | return ret; |
531 | } | |
532 | ||
56c47754 DH |
533 | static int uhid_dev_create(struct uhid_device *uhid, |
534 | struct uhid_event *ev) | |
535 | { | |
536 | struct uhid_create_req orig; | |
537 | ||
538 | orig = ev->u.create; | |
539 | ||
540 | if (orig.rd_size <= 0 || orig.rd_size > HID_MAX_DESCRIPTOR_SIZE) | |
541 | return -EINVAL; | |
542 | if (copy_from_user(&ev->u.create2.rd_data, orig.rd_data, orig.rd_size)) | |
543 | return -EFAULT; | |
544 | ||
545 | memcpy(ev->u.create2.name, orig.name, sizeof(orig.name)); | |
546 | memcpy(ev->u.create2.phys, orig.phys, sizeof(orig.phys)); | |
547 | memcpy(ev->u.create2.uniq, orig.uniq, sizeof(orig.uniq)); | |
548 | ev->u.create2.rd_size = orig.rd_size; | |
549 | ev->u.create2.bus = orig.bus; | |
550 | ev->u.create2.vendor = orig.vendor; | |
551 | ev->u.create2.product = orig.product; | |
552 | ev->u.create2.version = orig.version; | |
553 | ev->u.create2.country = orig.country; | |
554 | ||
555 | return uhid_dev_create2(uhid, ev); | |
556 | } | |
557 | ||
d365c6cf DH |
558 | static int uhid_dev_destroy(struct uhid_device *uhid) |
559 | { | |
560 | if (!uhid->running) | |
561 | return -EINVAL; | |
562 | ||
563 | uhid->running = false; | |
fcfcf0de | 564 | wake_up_interruptible(&uhid->report_wait); |
d365c6cf | 565 | |
67f8ecc5 RC |
566 | cancel_work_sync(&uhid->worker); |
567 | ||
d365c6cf DH |
568 | hid_destroy_device(uhid->hid); |
569 | kfree(uhid->rd_data); | |
570 | ||
571 | return 0; | |
572 | } | |
573 | ||
5e87a36a DH |
574 | static int uhid_dev_input(struct uhid_device *uhid, struct uhid_event *ev) |
575 | { | |
576 | if (!uhid->running) | |
577 | return -EINVAL; | |
578 | ||
579 | hid_input_report(uhid->hid, HID_INPUT_REPORT, ev->u.input.data, | |
580 | min_t(size_t, ev->u.input.size, UHID_DATA_MAX), 0); | |
581 | ||
582 | return 0; | |
583 | } | |
584 | ||
4522643a PG |
585 | static int uhid_dev_input2(struct uhid_device *uhid, struct uhid_event *ev) |
586 | { | |
587 | if (!uhid->running) | |
588 | return -EINVAL; | |
589 | ||
590 | hid_input_report(uhid->hid, HID_INPUT_REPORT, ev->u.input2.data, | |
591 | min_t(size_t, ev->u.input2.size, UHID_DATA_MAX), 0); | |
592 | ||
593 | return 0; | |
594 | } | |
595 | ||
fa71f32b DH |
596 | static int uhid_dev_get_report_reply(struct uhid_device *uhid, |
597 | struct uhid_event *ev) | |
fcfcf0de | 598 | { |
fcfcf0de DH |
599 | if (!uhid->running) |
600 | return -EINVAL; | |
601 | ||
11c22155 DH |
602 | uhid_report_wake_up(uhid, ev->u.get_report_reply.id, ev); |
603 | return 0; | |
604 | } | |
fcfcf0de | 605 | |
11c22155 DH |
606 | static int uhid_dev_set_report_reply(struct uhid_device *uhid, |
607 | struct uhid_event *ev) | |
608 | { | |
609 | if (!uhid->running) | |
610 | return -EINVAL; | |
fcfcf0de | 611 | |
11c22155 | 612 | uhid_report_wake_up(uhid, ev->u.set_report_reply.id, ev); |
fcfcf0de DH |
613 | return 0; |
614 | } | |
615 | ||
1ccd7a2a DH |
616 | static int uhid_char_open(struct inode *inode, struct file *file) |
617 | { | |
ace3d861 DH |
618 | struct uhid_device *uhid; |
619 | ||
620 | uhid = kzalloc(sizeof(*uhid), GFP_KERNEL); | |
621 | if (!uhid) | |
622 | return -ENOMEM; | |
623 | ||
d937ae5f | 624 | mutex_init(&uhid->devlock); |
fcfcf0de | 625 | mutex_init(&uhid->report_lock); |
ace3d861 DH |
626 | spin_lock_init(&uhid->qlock); |
627 | init_waitqueue_head(&uhid->waitq); | |
fcfcf0de | 628 | init_waitqueue_head(&uhid->report_wait); |
d365c6cf | 629 | uhid->running = false; |
67f8ecc5 | 630 | INIT_WORK(&uhid->worker, uhid_device_add_worker); |
ace3d861 DH |
631 | |
632 | file->private_data = uhid; | |
633 | nonseekable_open(inode, file); | |
634 | ||
1ccd7a2a DH |
635 | return 0; |
636 | } | |
637 | ||
638 | static int uhid_char_release(struct inode *inode, struct file *file) | |
639 | { | |
ace3d861 DH |
640 | struct uhid_device *uhid = file->private_data; |
641 | unsigned int i; | |
642 | ||
d365c6cf DH |
643 | uhid_dev_destroy(uhid); |
644 | ||
ace3d861 DH |
645 | for (i = 0; i < UHID_BUFSIZE; ++i) |
646 | kfree(uhid->outq[i]); | |
647 | ||
648 | kfree(uhid); | |
649 | ||
1ccd7a2a DH |
650 | return 0; |
651 | } | |
652 | ||
653 | static ssize_t uhid_char_read(struct file *file, char __user *buffer, | |
654 | size_t count, loff_t *ppos) | |
655 | { | |
d937ae5f DH |
656 | struct uhid_device *uhid = file->private_data; |
657 | int ret; | |
658 | unsigned long flags; | |
659 | size_t len; | |
660 | ||
661 | /* they need at least the "type" member of uhid_event */ | |
662 | if (count < sizeof(__u32)) | |
663 | return -EINVAL; | |
664 | ||
665 | try_again: | |
666 | if (file->f_flags & O_NONBLOCK) { | |
667 | if (uhid->head == uhid->tail) | |
668 | return -EAGAIN; | |
669 | } else { | |
670 | ret = wait_event_interruptible(uhid->waitq, | |
671 | uhid->head != uhid->tail); | |
672 | if (ret) | |
673 | return ret; | |
674 | } | |
675 | ||
676 | ret = mutex_lock_interruptible(&uhid->devlock); | |
677 | if (ret) | |
678 | return ret; | |
679 | ||
680 | if (uhid->head == uhid->tail) { | |
681 | mutex_unlock(&uhid->devlock); | |
682 | goto try_again; | |
683 | } else { | |
684 | len = min(count, sizeof(**uhid->outq)); | |
adefb69b | 685 | if (copy_to_user(buffer, uhid->outq[uhid->tail], len)) { |
d937ae5f DH |
686 | ret = -EFAULT; |
687 | } else { | |
688 | kfree(uhid->outq[uhid->tail]); | |
689 | uhid->outq[uhid->tail] = NULL; | |
690 | ||
691 | spin_lock_irqsave(&uhid->qlock, flags); | |
692 | uhid->tail = (uhid->tail + 1) % UHID_BUFSIZE; | |
693 | spin_unlock_irqrestore(&uhid->qlock, flags); | |
694 | } | |
695 | } | |
696 | ||
697 | mutex_unlock(&uhid->devlock); | |
698 | return ret ? ret : len; | |
1ccd7a2a DH |
699 | } |
700 | ||
701 | static ssize_t uhid_char_write(struct file *file, const char __user *buffer, | |
702 | size_t count, loff_t *ppos) | |
703 | { | |
6664ef72 DH |
704 | struct uhid_device *uhid = file->private_data; |
705 | int ret; | |
706 | size_t len; | |
707 | ||
708 | /* we need at least the "type" member of uhid_event */ | |
709 | if (count < sizeof(__u32)) | |
710 | return -EINVAL; | |
711 | ||
712 | ret = mutex_lock_interruptible(&uhid->devlock); | |
713 | if (ret) | |
714 | return ret; | |
715 | ||
716 | memset(&uhid->input_buf, 0, sizeof(uhid->input_buf)); | |
717 | len = min(count, sizeof(uhid->input_buf)); | |
befde022 DT |
718 | |
719 | ret = uhid_event_from_user(buffer, len, &uhid->input_buf); | |
720 | if (ret) | |
6664ef72 | 721 | goto unlock; |
6664ef72 DH |
722 | |
723 | switch (uhid->input_buf.type) { | |
d365c6cf DH |
724 | case UHID_CREATE: |
725 | ret = uhid_dev_create(uhid, &uhid->input_buf); | |
726 | break; | |
4522643a PG |
727 | case UHID_CREATE2: |
728 | ret = uhid_dev_create2(uhid, &uhid->input_buf); | |
729 | break; | |
d365c6cf DH |
730 | case UHID_DESTROY: |
731 | ret = uhid_dev_destroy(uhid); | |
732 | break; | |
5e87a36a DH |
733 | case UHID_INPUT: |
734 | ret = uhid_dev_input(uhid, &uhid->input_buf); | |
735 | break; | |
4522643a PG |
736 | case UHID_INPUT2: |
737 | ret = uhid_dev_input2(uhid, &uhid->input_buf); | |
738 | break; | |
fa71f32b DH |
739 | case UHID_GET_REPORT_REPLY: |
740 | ret = uhid_dev_get_report_reply(uhid, &uhid->input_buf); | |
fcfcf0de | 741 | break; |
11c22155 DH |
742 | case UHID_SET_REPORT_REPLY: |
743 | ret = uhid_dev_set_report_reply(uhid, &uhid->input_buf); | |
744 | break; | |
6664ef72 DH |
745 | default: |
746 | ret = -EOPNOTSUPP; | |
747 | } | |
748 | ||
749 | unlock: | |
750 | mutex_unlock(&uhid->devlock); | |
751 | ||
752 | /* return "count" not "len" to not confuse the caller */ | |
753 | return ret ? ret : count; | |
1ccd7a2a DH |
754 | } |
755 | ||
afc9a42b | 756 | static __poll_t uhid_char_poll(struct file *file, poll_table *wait) |
1ccd7a2a | 757 | { |
1f9dec1e DH |
758 | struct uhid_device *uhid = file->private_data; |
759 | ||
760 | poll_wait(file, &uhid->waitq, wait); | |
761 | ||
762 | if (uhid->head != uhid->tail) | |
a9a08845 | 763 | return EPOLLIN | EPOLLRDNORM; |
1f9dec1e | 764 | |
1ccd7a2a DH |
765 | return 0; |
766 | } | |
767 | ||
768 | static const struct file_operations uhid_fops = { | |
769 | .owner = THIS_MODULE, | |
770 | .open = uhid_char_open, | |
771 | .release = uhid_char_release, | |
772 | .read = uhid_char_read, | |
773 | .write = uhid_char_write, | |
774 | .poll = uhid_char_poll, | |
775 | .llseek = no_llseek, | |
776 | }; | |
777 | ||
778 | static struct miscdevice uhid_misc = { | |
779 | .fops = &uhid_fops, | |
19872d20 | 780 | .minor = UHID_MINOR, |
1ccd7a2a DH |
781 | .name = UHID_NAME, |
782 | }; | |
ca75d601 | 783 | module_misc_device(uhid_misc); |
1ccd7a2a | 784 | |
1ccd7a2a DH |
785 | MODULE_LICENSE("GPL"); |
786 | MODULE_AUTHOR("David Herrmann <dh.herrmann@gmail.com>"); | |
787 | MODULE_DESCRIPTION("User-space I/O driver support for HID subsystem"); | |
19872d20 | 788 | MODULE_ALIAS_MISCDEV(UHID_MINOR); |
60cbd53e | 789 | MODULE_ALIAS("devname:" UHID_NAME); |