summaryrefslogtreecommitdiff
path: root/sys/dev/usb/uhid.c
blob: 4c73f4f1cdc0c2574da1c5ef2ed2f3987921d048 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
/*	$OpenBSD: uhid.c,v 1.62 2016/01/08 15:54:14 jcs Exp $ */
/*	$NetBSD: uhid.c,v 1.57 2003/03/11 16:44:00 augustss Exp $	*/

/*
 * Copyright (c) 1998 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Lennart Augustsson (lennart@augustsson.net) at
 * Carlstedt Research & Technology.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * HID spec: http://www.usb.org/developers/devclass_docs/HID1_11.pdf
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/signalvar.h>
#include <sys/device.h>
#include <sys/ioctl.h>
#include <sys/conf.h>
#include <sys/tty.h>
#include <sys/file.h>
#include <sys/selinfo.h>
#include <sys/proc.h>
#include <sys/vnode.h>
#include <sys/poll.h>

#include <dev/usb/usb.h>
#include <dev/usb/usbhid.h>

#include <dev/usb/usbdevs.h>
#include <dev/usb/usbdi.h>
#include <dev/usb/usbdi_util.h>

#include <dev/usb/uhidev.h>

#include <dev/hid/hid.h>

#ifdef UHID_DEBUG
#define DPRINTF(x)	do { if (uhiddebug) printf x; } while (0)
#define DPRINTFN(n,x)	do { if (uhiddebug>(n)) printf x; } while (0)
int	uhiddebug = 0;
#else
#define DPRINTF(x)
#define DPRINTFN(n,x)
#endif

struct uhid_softc {
	struct uhidev sc_hdev;

	u_char *sc_obuf;

	struct clist sc_q;
	struct selinfo sc_rsel;
	struct process *sc_async;	/* process that wants SIGIO */
	u_char sc_state;		/* driver state */
#define	UHID_ASLP	0x01		/* waiting for device data */
#define UHID_IMMED	0x02		/* return read data immediately */

	int sc_refcnt;
};

#define	UHIDUNIT(dev)	(minor(dev))
#define	UHID_CHUNK	128	/* chunk size for read */
#define	UHID_BSIZE	1020	/* buffer size */

void uhid_intr(struct uhidev *, void *, u_int len);

int uhid_do_read(struct uhid_softc *, struct uio *uio, int);
int uhid_do_write(struct uhid_softc *, struct uio *uio, int);
int uhid_do_ioctl(struct uhid_softc*, u_long, caddr_t, int,
			 struct proc *);

int uhid_match(struct device *, void *, void *); 
void uhid_attach(struct device *, struct device *, void *); 
int uhid_detach(struct device *, int); 

struct cfdriver uhid_cd = { 
	NULL, "uhid", DV_DULL 
}; 

const struct cfattach uhid_ca = { 
	sizeof(struct uhid_softc), 
	uhid_match, 
	uhid_attach, 
	uhid_detach, 
};

int
uhid_match(struct device *parent, void *match, void *aux)
{
	struct uhidev_attach_arg *uha = aux;

	if (uha->reportid == UHIDEV_CLAIM_ALLREPORTID)
		return (UMATCH_NONE);

	return (UMATCH_IFACECLASS_GENERIC);
}

void
uhid_attach(struct device *parent, struct device *self, void *aux)
{
	struct uhid_softc *sc = (struct uhid_softc *)self;
	struct uhidev_attach_arg *uha = (struct uhidev_attach_arg *)aux;
	int size, repid;
	void *desc;

	sc->sc_hdev.sc_intr = uhid_intr;
	sc->sc_hdev.sc_parent = uha->parent;
	sc->sc_hdev.sc_udev = uha->uaa->device;
	sc->sc_hdev.sc_report_id = uha->reportid;

	uhidev_get_report_desc(uha->parent, &desc, &size);
	repid = uha->reportid;
	sc->sc_hdev.sc_isize = hid_report_size(desc, size, hid_input, repid);
	sc->sc_hdev.sc_osize = hid_report_size(desc, size, hid_output, repid);
	sc->sc_hdev.sc_fsize = hid_report_size(desc, size, hid_feature, repid);

	printf(": input=%d, output=%d, feature=%d\n",
	    sc->sc_hdev.sc_isize, sc->sc_hdev.sc_osize, sc->sc_hdev.sc_fsize);
}

int
uhid_detach(struct device *self, int flags)
{
	struct uhid_softc *sc = (struct uhid_softc *)self;
	int s;
	int maj, mn;

	DPRINTF(("uhid_detach: sc=%p flags=%d\n", sc, flags));

	if (sc->sc_hdev.sc_state & UHIDEV_OPEN) {
		s = splusb();
		if (--sc->sc_refcnt >= 0) {
			/* Wake everyone */
			wakeup(&sc->sc_q);
			/* Wait for processes to go away. */
			usb_detach_wait(&sc->sc_hdev.sc_dev);
		}
		splx(s);
	}

	/* locate the major number */
	for (maj = 0; maj < nchrdev; maj++)
		if (cdevsw[maj].d_open == uhidopen)
			break;

	/* Nuke the vnodes for any open instances (calls close). */
	mn = self->dv_unit;
	vdevgone(maj, mn, mn, VCHR);

	return (0);
}

void
uhid_intr(struct uhidev *addr, void *data, u_int len)
{
	struct uhid_softc *sc = (struct uhid_softc *)addr;

#ifdef UHID_DEBUG
	if (uhiddebug > 5) {
		u_int32_t i;

		DPRINTF(("uhid_intr: data ="));
		for (i = 0; i < len; i++)
			DPRINTF((" %02x", ((u_char *)data)[i]));
		DPRINTF(("\n"));
	}
#endif

	(void)b_to_q(data, len, &sc->sc_q);

	if (sc->sc_state & UHID_ASLP) {
		sc->sc_state &= ~UHID_ASLP;
		DPRINTFN(5, ("uhid_intr: waking %p\n", &sc->sc_q));
		wakeup(&sc->sc_q);
	}
	selwakeup(&sc->sc_rsel);
	if (sc->sc_async != NULL) {
		DPRINTFN(3, ("uhid_intr: sending SIGIO %p\n", sc->sc_async));
		prsignal(sc->sc_async, SIGIO);
	}
}

int
uhidopen(dev_t dev, int flag, int mode, struct proc *p)
{
	struct uhid_softc *sc;
	int error;

	if (UHIDUNIT(dev) >= uhid_cd.cd_ndevs)
		return (ENXIO);
	sc = uhid_cd.cd_devs[UHIDUNIT(dev)];
	if (sc == NULL)
		return (ENXIO);

	DPRINTF(("uhidopen: sc=%p\n", sc));

	if (usbd_is_dying(sc->sc_hdev.sc_udev))
		return (ENXIO);

	error = uhidev_open(&sc->sc_hdev);
	if (error)
		return (error);

	clalloc(&sc->sc_q, UHID_BSIZE, 0);

	sc->sc_obuf = malloc(sc->sc_hdev.sc_osize, M_USBDEV, M_WAITOK);
	sc->sc_state &= ~UHID_IMMED;
	sc->sc_async = NULL;

	return (0);
}

int
uhidclose(dev_t dev, int flag, int mode, struct proc *p)
{
	struct uhid_softc *sc;

	sc = uhid_cd.cd_devs[UHIDUNIT(dev)];

	DPRINTF(("uhidclose: sc=%p\n", sc));

	clfree(&sc->sc_q);
	free(sc->sc_obuf, M_USBDEV, 0);
	sc->sc_async = NULL;
	uhidev_close(&sc->sc_hdev);

	return (0);
}

int
uhid_do_read(struct uhid_softc *sc, struct uio *uio, int flag)
{
	int s;
	int error = 0;
	size_t length;
	u_char buffer[UHID_CHUNK];

	DPRINTFN(1, ("uhidread\n"));
	if (sc->sc_state & UHID_IMMED) {
		DPRINTFN(1, ("uhidread immed\n"));
		if (uhidev_get_report(sc->sc_hdev.sc_parent,
		    UHID_INPUT_REPORT, sc->sc_hdev.sc_report_id, buffer,
		    sc->sc_hdev.sc_isize) != sc->sc_hdev.sc_isize)
			return (EIO);
		return (uiomovei(buffer, sc->sc_hdev.sc_isize, uio));
	}

	s = splusb();
	while (sc->sc_q.c_cc == 0) {
		if (flag & IO_NDELAY) {
			splx(s);
			return (EWOULDBLOCK);
		}
		sc->sc_state |= UHID_ASLP;
		DPRINTFN(5, ("uhidread: sleep on %p\n", &sc->sc_q));
		error = tsleep(&sc->sc_q, PZERO | PCATCH, "uhidrea", 0);
		DPRINTFN(5, ("uhidread: woke, error=%d\n", error));
		if (usbd_is_dying(sc->sc_hdev.sc_udev))
			error = EIO;
		if (error) {
			sc->sc_state &= ~UHID_ASLP;
			break;
		}
	}
	splx(s);

	/* Transfer as many chunks as possible. */
	while (sc->sc_q.c_cc > 0 && uio->uio_resid > 0 && !error) {
		length = min(sc->sc_q.c_cc, uio->uio_resid);
		if (length > sizeof(buffer))
			length = sizeof(buffer);

		/* Remove a small chunk from the input queue. */
		(void) q_to_b(&sc->sc_q, buffer, length);
		DPRINTFN(5, ("uhidread: got %lu chars\n", (u_long)length));

		/* Copy the data to the user process. */
		if ((error = uiomovei(buffer, length, uio)) != 0)
			break;
	}

	return (error);
}

int
uhidread(dev_t dev, struct uio *uio, int flag)
{
	struct uhid_softc *sc;
	int error;

	sc = uhid_cd.cd_devs[UHIDUNIT(dev)];

	sc->sc_refcnt++;
	error = uhid_do_read(sc, uio, flag);
	if (--sc->sc_refcnt < 0)
		usb_detach_wakeup(&sc->sc_hdev.sc_dev);
	return (error);
}

int
uhid_do_write(struct uhid_softc *sc, struct uio *uio, int flag)
{
	int error;
	int size;

	DPRINTFN(1, ("uhidwrite\n"));

	if (usbd_is_dying(sc->sc_hdev.sc_udev))
		return (EIO);

	size = sc->sc_hdev.sc_osize;
	error = 0;
	if (uio->uio_resid != size)
		return (EINVAL);
	error = uiomovei(sc->sc_obuf, size, uio);
	if (!error) {
		if (uhidev_set_report(sc->sc_hdev.sc_parent,
		    UHID_OUTPUT_REPORT, sc->sc_hdev.sc_report_id, sc->sc_obuf,
		    size) != size)
			error = EIO;
	}

	return (error);
}

int
uhidwrite(dev_t dev, struct uio *uio, int flag)
{
	struct uhid_softc *sc;
	int error;

	sc = uhid_cd.cd_devs[UHIDUNIT(dev)];

	sc->sc_refcnt++;
	error = uhid_do_write(sc, uio, flag);
	if (--sc->sc_refcnt < 0)
		usb_detach_wakeup(&sc->sc_hdev.sc_dev);
	return (error);
}

int
uhid_do_ioctl(struct uhid_softc *sc, u_long cmd, caddr_t addr,
	      int flag, struct proc *p)
{
	u_char buffer[UHID_CHUNK];
	usbd_status err;
	int rc, size;

	DPRINTFN(2, ("uhidioctl: cmd=%lx\n", cmd));

	if (usbd_is_dying(sc->sc_hdev.sc_udev))
		return (EIO);

	switch (cmd) {
	case FIONBIO:
		/* All handled in the upper FS layer. */
		break;

	case FIOASYNC:
		if (*(int *)addr) {
			if (sc->sc_async != NULL)
				return (EBUSY);
			sc->sc_async = p->p_p;
			DPRINTF(("uhid_do_ioctl: FIOASYNC %p\n", p));
		} else
			sc->sc_async = NULL;
		break;

	/* XXX this is not the most general solution. */
	case TIOCSPGRP:
		if (sc->sc_async == NULL)
			return (EINVAL);
		if (*(int *)addr != sc->sc_async->ps_pgid)
			return (EPERM);
		break;

	case USB_SET_IMMED:
		if (*(int *)addr) {
			if (uhidev_get_report(sc->sc_hdev.sc_parent,
			    UHID_INPUT_REPORT, sc->sc_hdev.sc_report_id, buffer,
			    sc->sc_hdev.sc_isize) != sc->sc_hdev.sc_isize)
				return (EOPNOTSUPP);

			sc->sc_state |=  UHID_IMMED;
		} else
			sc->sc_state &= ~UHID_IMMED;
		break;

	case USB_GET_DEVICEINFO:
		usbd_fill_deviceinfo(sc->sc_hdev.sc_udev,
				     (struct usb_device_info *)addr, 1);
		break;

        case USB_GET_STRING_DESC:
	    {
		struct usb_string_desc *si = (struct usb_string_desc *)addr;
		err = usbd_get_string_desc(sc->sc_hdev.sc_udev,
			si->usd_string_index,
			si->usd_language_id, &si->usd_desc, &size);
		if (err)
			return (EINVAL);
		break;
	    }

	case USB_GET_REPORT_DESC:
	case USB_GET_REPORT:
	case USB_SET_REPORT:
	case USB_GET_REPORT_ID:
	default:
		rc = uhidev_ioctl(&sc->sc_hdev, cmd, addr, flag, p);
		if (rc == -1)
			rc = EINVAL;
		return rc;
	}
	return (0);
}

int
uhidioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct proc *p)
{
	struct uhid_softc *sc;
	int error;

	sc = uhid_cd.cd_devs[UHIDUNIT(dev)];

	sc->sc_refcnt++;
	error = uhid_do_ioctl(sc, cmd, addr, flag, p);
	if (--sc->sc_refcnt < 0)
		usb_detach_wakeup(&sc->sc_hdev.sc_dev);
	return (error);
}

int
uhidpoll(dev_t dev, int events, struct proc *p)
{
	struct uhid_softc *sc;
	int revents = 0;
	int s;

	sc = uhid_cd.cd_devs[UHIDUNIT(dev)];

	if (usbd_is_dying(sc->sc_hdev.sc_udev))
		return (POLLERR);

	s = splusb();
	if (events & (POLLOUT | POLLWRNORM))
		revents |= events & (POLLOUT | POLLWRNORM);
	if (events & (POLLIN | POLLRDNORM)) {
		if (sc->sc_q.c_cc > 0)
			revents |= events & (POLLIN | POLLRDNORM);
		else
			selrecord(p, &sc->sc_rsel);
	}

	splx(s);
	return (revents);
}

void filt_uhidrdetach(struct knote *);
int filt_uhidread(struct knote *, long);
int uhidkqfilter(dev_t, struct knote *);

void
filt_uhidrdetach(struct knote *kn)
{
	struct uhid_softc *sc = (void *)kn->kn_hook;
	int s;

	s = splusb();
	SLIST_REMOVE(&sc->sc_rsel.si_note, kn, knote, kn_selnext);
	splx(s);
}

int
filt_uhidread(struct knote *kn, long hint)
{
	struct uhid_softc *sc = (void *)kn->kn_hook;

	kn->kn_data = sc->sc_q.c_cc;
	return (kn->kn_data > 0);
}

struct filterops uhidread_filtops =
	{ 1, NULL, filt_uhidrdetach, filt_uhidread };

struct filterops uhid_seltrue_filtops =
	{ 1, NULL, filt_uhidrdetach, filt_seltrue };

int
uhidkqfilter(dev_t dev, struct knote *kn)
{
	struct uhid_softc *sc;
	struct klist *klist;
	int s;

	sc = uhid_cd.cd_devs[UHIDUNIT(dev)];

	if (usbd_is_dying(sc->sc_hdev.sc_udev))
		return (EIO);

	switch (kn->kn_filter) {
	case EVFILT_READ:
		klist = &sc->sc_rsel.si_note;
		kn->kn_fop = &uhidread_filtops;
		break;

	case EVFILT_WRITE:
		klist = &sc->sc_rsel.si_note;
		kn->kn_fop = &uhid_seltrue_filtops;
		break;

	default:
		return (EINVAL);
	}

	kn->kn_hook = (void *)sc;

	s = splusb();
	SLIST_INSERT_HEAD(klist, kn, kn_selnext);
	splx(s);

	return (0);
}