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
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
|
/* $NetBSD: gpio.c,v 1.32 2010/02/24 22:37:57 dyoung Exp $ */
/* $OpenBSD: gpio.c,v 1.6 2006/01/14 12:33:49 grange Exp $ */
/*
* Copyright (c) 2008, 2009, 2010 Marc Balmer <marc@msys.ch>
* Copyright (c) 2004, 2006 Alexander Yurchenko <grange@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: gpio.c,v 1.32 2010/02/24 22:37:57 dyoung Exp $");
/*
* General Purpose Input/Output framework.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/device.h>
#include <sys/fcntl.h>
#include <sys/ioctl.h>
#include <sys/gpio.h>
#include <sys/vnode.h>
#include <sys/kmem.h>
#include <sys/queue.h>
#include <sys/kauth.h>
#include <dev/gpio/gpiovar.h>
#include "locators.h"
#ifdef GPIO_DEBUG
#define DPRINTFN(n, x) do { if (gpiodebug > (n)) printf x; } while (0)
int gpiodebug = 0;
#else
#define DPRINTFN(n, x)
#endif
#define DPRINTF(x) DPRINTFN(0, x)
struct gpio_softc {
device_t sc_dev;
gpio_chipset_tag_t sc_gc; /* GPIO controller */
gpio_pin_t *sc_pins; /* pins array */
int sc_npins; /* number of pins */
int sc_opened;
LIST_HEAD(, gpio_dev) sc_devs; /* devices */
LIST_HEAD(, gpio_name) sc_names; /* named pins */
};
int gpio_match(device_t, cfdata_t, void *);
int gpio_submatch(device_t, cfdata_t, const int *, void *);
void gpio_attach(device_t, device_t, void *);
int gpio_rescan(device_t, const char *, const int *);
void gpio_childdetached(device_t, device_t);
bool gpio_resume(device_t, const pmf_qual_t *);
int gpio_detach(device_t, int);
int gpio_search(device_t, cfdata_t, const int *, void *);
int gpio_print(void *, const char *);
int gpio_pinbyname(struct gpio_softc *, char *);
/* Old API */
int gpio_ioctl_oapi(struct gpio_softc *, u_long, void *, int, kauth_cred_t);
CFATTACH_DECL3_NEW(gpio, sizeof(struct gpio_softc),
gpio_match, gpio_attach, gpio_detach, NULL, gpio_rescan,
gpio_childdetached, DVF_DETACH_SHUTDOWN);
dev_type_open(gpioopen);
dev_type_close(gpioclose);
dev_type_ioctl(gpioioctl);
const struct cdevsw gpio_cdevsw = {
gpioopen, gpioclose, noread, nowrite, gpioioctl,
nostop, notty, nopoll, nommap, nokqfilter, D_OTHER,
};
extern struct cfdriver gpio_cd;
int
gpio_match(device_t parent, cfdata_t cf, void *aux)
{
return 1;
}
int
gpio_submatch(device_t parent, cfdata_t cf, const int *ip, void *aux)
{
struct gpio_attach_args *ga = aux;
if (ga->ga_offset == -1)
return 0;
return strcmp(ga->ga_dvname, cf->cf_name) == 0;
}
bool
gpio_resume(device_t self, const pmf_qual_t *qual)
{
struct gpio_softc *sc = device_private(self);
int pin;
for (pin = 0; pin < sc->sc_npins; pin++) {
gpiobus_pin_ctl(sc->sc_gc, pin, sc->sc_pins[pin].pin_flags);
gpiobus_pin_write(sc->sc_gc, pin, sc->sc_pins[pin].pin_state);
}
return true;
}
void
gpio_childdetached(device_t self, device_t child)
{
/* gpio(4) keeps no references to its children, so do nothing. */
}
int
gpio_rescan(device_t self, const char *ifattr, const int *locators)
{
struct gpio_softc *sc = device_private(self);
config_search_loc(gpio_search, self, ifattr, locators, sc);
return 0;
}
void
gpio_attach(device_t parent, device_t self, void *aux)
{
struct gpio_softc *sc = device_private(self);
struct gpiobus_attach_args *gba = aux;
sc->sc_dev = self;
sc->sc_gc = gba->gba_gc;
sc->sc_pins = gba->gba_pins;
sc->sc_npins = gba->gba_npins;
printf(": %d pins\n", sc->sc_npins);
if (!pmf_device_register(self, NULL, gpio_resume))
aprint_error_dev(self, "couldn't establish power handler\n");
/*
* Attach all devices that can be connected to the GPIO pins
* described in the kernel configuration file.
*/
gpio_rescan(self, "gpio", NULL);
}
int
gpio_detach(device_t self, int flags)
{
int rc;
if ((rc = config_detach_children(self, flags)) != 0)
return rc;
#if 0
int maj, mn;
/* Locate the major number */
for (maj = 0; maj < nchrdev; maj++)
if (cdevsw[maj].d_open == gpioopen)
break;
/* Nuke the vnodes for any open instances (calls close) */
mn = device_unit(self);
vdevgone(maj, mn, mn, VCHR);
#endif
return 0;
}
int
gpio_search(device_t parent, cfdata_t cf, const int *ldesc, void *aux)
{
struct gpio_attach_args ga;
ga.ga_gpio = aux;
ga.ga_offset = cf->cf_loc[GPIOCF_OFFSET];
ga.ga_mask = cf->cf_loc[GPIOCF_MASK];
if (config_match(parent, cf, &ga) > 0)
config_attach(parent, cf, &ga, gpio_print);
return 0;
}
int
gpio_print(void *aux, const char *pnp)
{
struct gpio_attach_args *ga = aux;
int i;
printf(" pins");
for (i = 0; i < 32; i++)
if (ga->ga_mask & (1 << i))
printf(" %d", ga->ga_offset + i);
return UNCONF;
}
int
gpiobus_print(void *aux, const char *pnp)
{
#if 0
struct gpiobus_attach_args *gba = aux;
#endif
if (pnp != NULL)
printf("gpiobus at %s", pnp);
return UNCONF;
}
/* return 1 if all pins can be mapped, 0 if not */
int
gpio_pin_can_map(void *gpio, int offset, u_int32_t mask)
{
struct gpio_softc *sc = gpio;
int npins, pin, i;
npins = gpio_npins(mask);
if (npins > sc->sc_npins)
return 0;
for (npins = 0, i = 0; i < 32; i++)
if (mask & (1 << i)) {
pin = offset + i;
if (pin < 0 || pin >= sc->sc_npins)
return 0;
if (sc->sc_pins[pin].pin_mapped)
return 0;
}
return 1;
}
int
gpio_pin_map(void *gpio, int offset, u_int32_t mask, struct gpio_pinmap *map)
{
struct gpio_softc *sc = gpio;
int npins, pin, i;
npins = gpio_npins(mask);
if (npins > sc->sc_npins)
return 1;
for (npins = 0, i = 0; i < 32; i++)
if (mask & (1 << i)) {
pin = offset + i;
if (pin < 0 || pin >= sc->sc_npins)
return 1;
if (sc->sc_pins[pin].pin_mapped)
return 1;
sc->sc_pins[pin].pin_mapped = 1;
map->pm_map[npins++] = pin;
}
map->pm_size = npins;
return 0;
}
void
gpio_pin_unmap(void *gpio, struct gpio_pinmap *map)
{
struct gpio_softc *sc = gpio;
int pin, i;
for (i = 0; i < map->pm_size; i++) {
pin = map->pm_map[i];
sc->sc_pins[pin].pin_mapped = 0;
}
}
int
gpio_pin_read(void *gpio, struct gpio_pinmap *map, int pin)
{
struct gpio_softc *sc = gpio;
return gpiobus_pin_read(sc->sc_gc, map->pm_map[pin]);
}
void
gpio_pin_write(void *gpio, struct gpio_pinmap *map, int pin, int value)
{
struct gpio_softc *sc = gpio;
gpiobus_pin_write(sc->sc_gc, map->pm_map[pin], value);
sc->sc_pins[map->pm_map[pin]].pin_state = value;
}
void
gpio_pin_ctl(void *gpio, struct gpio_pinmap *map, int pin, int flags)
{
struct gpio_softc *sc = gpio;
return gpiobus_pin_ctl(sc->sc_gc, map->pm_map[pin], flags);
}
int
gpio_pin_caps(void *gpio, struct gpio_pinmap *map, int pin)
{
struct gpio_softc *sc = gpio;
return sc->sc_pins[map->pm_map[pin]].pin_caps;
}
int
gpio_npins(u_int32_t mask)
{
int npins, i;
for (npins = 0, i = 0; i < 32; i++)
if (mask & (1 << i))
npins++;
return npins;
}
int
gpioopen(dev_t dev, int flag, int mode, struct lwp *l)
{
struct gpio_softc *sc;
int ret;
sc = device_lookup_private(&gpio_cd, minor(dev));
if (sc == NULL)
return ENXIO;
DPRINTF(("%s: opening\n", device_xname(sc->sc_dev)));
if (sc->sc_opened) {
DPRINTF(("%s: already opened\n", device_xname(sc->sc_dev)));
return EBUSY;
}
if ((ret = gpiobus_open(sc->sc_gc, sc->sc_dev))) {
DPRINTF(("%s: gpiobus_open returned %d\n",
device_xname(sc->sc_dev),
ret));
return ret;
}
sc->sc_opened = 1;
return 0;
}
int
gpioclose(dev_t dev, int flag, int mode, struct lwp *l)
{
struct gpio_softc *sc;
sc = device_lookup_private(&gpio_cd, minor(dev));
DPRINTF(("%s: closing\n", device_xname(sc->sc_dev)));
gpiobus_close(sc->sc_gc, sc->sc_dev);
sc->sc_opened = 0;
return 0;
}
int
gpio_pinbyname(struct gpio_softc *sc, char *gp_name)
{
struct gpio_name *nm;
LIST_FOREACH(nm, &sc->sc_names, gp_next)
if (!strcmp(nm->gp_name, gp_name))
return nm->gp_pin;
return -1;
}
int
gpioioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
{
struct gpio_softc *sc;
gpio_chipset_tag_t gc;
struct gpio_info *info;
struct gpio_attach *attach;
struct gpio_attach_args ga;
struct gpio_dev *gdev;
struct gpio_req *req;
struct gpio_name *nm;
struct gpio_set *set;
device_t dv;
cfdata_t cf;
kauth_cred_t cred;
int locs[GPIOCF_NLOCS];
int pin, value, flags, npins;
sc = device_lookup_private(&gpio_cd, minor(dev));
gc = sc->sc_gc;
if (cmd != GPIOINFO && !device_is_active(sc->sc_dev)) {
DPRINTF(("%s: device is not active\n",
device_xname(sc->sc_dev)));
return EBUSY;
}
cred = kauth_cred_get();
switch (cmd) {
case GPIOINFO:
info = (struct gpio_info *)data;
if (!kauth_authorize_device(cred, KAUTH_DEVICE_GPIO_PINSET,
NULL, NULL, NULL, NULL))
info->gpio_npins = sc->sc_npins;
else {
for (pin = npins = 0; pin < sc->sc_npins; pin++)
if (sc->sc_pins[pin].pin_flags & GPIO_PIN_SET)
++npins;
info->gpio_npins = npins;
}
break;
case GPIOREAD:
req = (struct gpio_req *)data;
if (req->gp_name[0] != '\0') {
pin = gpio_pinbyname(sc, req->gp_name);
if (pin == -1)
return EINVAL;
} else
pin = req->gp_pin;
if (pin < 0 || pin >= sc->sc_npins)
return EINVAL;
if (!(sc->sc_pins[pin].pin_flags & GPIO_PIN_SET) &&
kauth_authorize_device(cred, KAUTH_DEVICE_GPIO_PINSET,
NULL, NULL, NULL, NULL))
return EPERM;
/* return read value */
req->gp_value = gpiobus_pin_read(gc, pin);
break;
case GPIOWRITE:
if ((flag & FWRITE) == 0)
return EBADF;
req = (struct gpio_req *)data;
if (req->gp_name[0] != '\0') {
pin = gpio_pinbyname(sc, req->gp_name);
if (pin == -1)
return EINVAL;
} else
pin = req->gp_pin;
if (pin < 0 || pin >= sc->sc_npins)
return EINVAL;
if (sc->sc_pins[pin].pin_mapped)
return EBUSY;
if (!(sc->sc_pins[pin].pin_flags & GPIO_PIN_SET) &&
kauth_authorize_device(cred, KAUTH_DEVICE_GPIO_PINSET,
NULL, NULL, NULL, NULL))
return EPERM;
value = req->gp_value;
if (value != GPIO_PIN_LOW && value != GPIO_PIN_HIGH)
return EINVAL;
gpiobus_pin_write(gc, pin, value);
/* return old value */
req->gp_value = sc->sc_pins[pin].pin_state;
/* update current value */
sc->sc_pins[pin].pin_state = value;
break;
case GPIOTOGGLE:
if ((flag & FWRITE) == 0)
return EBADF;
req = (struct gpio_req *)data;
if (req->gp_name[0] != '\0') {
pin = gpio_pinbyname(sc, req->gp_name);
if (pin == -1)
return EINVAL;
} else
pin = req->gp_pin;
if (pin < 0 || pin >= sc->sc_npins)
return EINVAL;
if (sc->sc_pins[pin].pin_mapped)
return EBUSY;
if (!(sc->sc_pins[pin].pin_flags & GPIO_PIN_SET) &&
kauth_authorize_device(cred, KAUTH_DEVICE_GPIO_PINSET,
NULL, NULL, NULL, NULL))
return EPERM;
value = (sc->sc_pins[pin].pin_state == GPIO_PIN_LOW ?
GPIO_PIN_HIGH : GPIO_PIN_LOW);
gpiobus_pin_write(gc, pin, value);
/* return old value */
req->gp_value = sc->sc_pins[pin].pin_state;
/* update current value */
sc->sc_pins[pin].pin_state = value;
break;
case GPIOATTACH:
if (kauth_authorize_device(cred, KAUTH_DEVICE_GPIO_PINSET,
NULL, NULL, NULL, NULL))
return EPERM;
attach = (struct gpio_attach *)data;
/* do not try to attach if the pins are already mapped */
if (!gpio_pin_can_map(sc, attach->ga_offset, attach->ga_mask))
return EBUSY;
ga.ga_gpio = sc;
ga.ga_dvname = attach->ga_dvname;
ga.ga_offset = attach->ga_offset;
ga.ga_mask = attach->ga_mask;
DPRINTF(("%s: attach %s with offset %d and mask 0x%02x\n",
device_xname(sc->sc_dev), ga.ga_dvname, ga.ga_offset,
ga.ga_mask));
locs[GPIOCF_OFFSET] = ga.ga_offset;
locs[GPIOCF_MASK] = ga.ga_mask;
cf = config_search_loc(NULL, sc->sc_dev, "gpio", locs, &ga);
if (cf != NULL) {
dv = config_attach_loc(sc->sc_dev, cf, locs, &ga,
gpiobus_print);
if (dv != NULL) {
gdev = kmem_alloc(sizeof(struct gpio_dev),
KM_SLEEP);
gdev->sc_dev = dv;
LIST_INSERT_HEAD(&sc->sc_devs, gdev, sc_next);
} else
return EINVAL;
} else
return EINVAL;
break;
case GPIODETACH:
if (kauth_authorize_device(cred, KAUTH_DEVICE_GPIO_PINSET,
NULL, NULL, NULL, NULL))
return EPERM;
attach = (struct gpio_attach *)data;
LIST_FOREACH(gdev, &sc->sc_devs, sc_next) {
if (strcmp(device_xname(gdev->sc_dev),
attach->ga_dvname) == 0) {
if (config_detach(gdev->sc_dev, 0) == 0) {
LIST_REMOVE(gdev, sc_next);
kmem_free(gdev,
sizeof(struct gpio_dev));
return 0;
}
break;
}
}
return EINVAL;
break;
case GPIOSET:
if (kauth_authorize_device(cred, KAUTH_DEVICE_GPIO_PINSET,
NULL, NULL, NULL, NULL))
return EPERM;
set = (struct gpio_set *)data;
if (set->gp_name[0] != '\0') {
pin = gpio_pinbyname(sc, set->gp_name);
if (pin == -1)
return EINVAL;
} else
pin = set->gp_pin;
if (pin < 0 || pin >= sc->sc_npins)
return EINVAL;
flags = set->gp_flags;
/* check that the controller supports all requested flags */
if ((flags & sc->sc_pins[pin].pin_caps) != flags)
return ENODEV;
flags = set->gp_flags | GPIO_PIN_SET;
set->gp_caps = sc->sc_pins[pin].pin_caps;
/* return old value */
set->gp_flags = sc->sc_pins[pin].pin_flags;
if (flags > 0) {
gpiobus_pin_ctl(gc, pin, flags);
/* update current value */
sc->sc_pins[pin].pin_flags = flags;
}
/* rename pin or new pin? */
if (set->gp_name2[0] != '\0') {
struct gpio_name *gnm;
gnm = NULL;
LIST_FOREACH(nm, &sc->sc_names, gp_next) {
if (!strcmp(nm->gp_name, set->gp_name2) &&
nm->gp_pin != pin)
return EINVAL; /* duplicate name */
if (nm->gp_pin == pin)
gnm = nm;
}
if (gnm != NULL)
strlcpy(gnm->gp_name, set->gp_name2,
sizeof(gnm->gp_name));
else {
nm = kmem_alloc(sizeof(struct gpio_name),
KM_SLEEP);
strlcpy(nm->gp_name, set->gp_name2,
sizeof(nm->gp_name));
nm->gp_pin = set->gp_pin;
LIST_INSERT_HEAD(&sc->sc_names, nm, gp_next);
}
}
break;
case GPIOUNSET:
if (kauth_authorize_device(cred, KAUTH_DEVICE_GPIO_PINSET,
NULL, NULL, NULL, NULL))
return EPERM;
set = (struct gpio_set *)data;
if (set->gp_name[0] != '\0') {
pin = gpio_pinbyname(sc, set->gp_name);
if (pin == -1)
return EINVAL;
} else
pin = set->gp_pin;
if (pin < 0 || pin >= sc->sc_npins)
return EINVAL;
if (sc->sc_pins[pin].pin_mapped)
return EBUSY;
if (!(sc->sc_pins[pin].pin_flags & GPIO_PIN_SET))
return EINVAL;
LIST_FOREACH(nm, &sc->sc_names, gp_next) {
if (nm->gp_pin == pin) {
LIST_REMOVE(nm, gp_next);
kmem_free(nm, sizeof(struct gpio_name));
break;
}
}
sc->sc_pins[pin].pin_flags &= ~GPIO_PIN_SET;
break;
default:
/* Try the old API */
DPRINTF(("%s: trying the old API\n", device_xname(sc->sc_dev)));
return gpio_ioctl_oapi(sc, cmd, data, flag, cred);
}
return 0;
}
int
gpio_ioctl_oapi(struct gpio_softc *sc, u_long cmd, void *data, int flag,
kauth_cred_t cred)
{
gpio_chipset_tag_t gc;
struct gpio_pin_op *op;
struct gpio_pin_ctl *ctl;
int pin, value, flags;
gc = sc->sc_gc;
switch (cmd) {
case GPIOPINREAD:
op = (struct gpio_pin_op *)data;
pin = op->gp_pin;
if (pin < 0 || pin >= sc->sc_npins)
return EINVAL;
if (!(sc->sc_pins[pin].pin_flags & GPIO_PIN_SET) &&
kauth_authorize_device(cred, KAUTH_DEVICE_GPIO_PINSET,
NULL, NULL, NULL, NULL))
return EPERM;
/* return read value */
op->gp_value = gpiobus_pin_read(gc, pin);
break;
case GPIOPINWRITE:
if ((flag & FWRITE) == 0)
return EBADF;
op = (struct gpio_pin_op *)data;
pin = op->gp_pin;
if (pin < 0 || pin >= sc->sc_npins)
return EINVAL;
if (sc->sc_pins[pin].pin_mapped)
return EBUSY;
if (!(sc->sc_pins[pin].pin_flags & GPIO_PIN_SET) &&
kauth_authorize_device(cred, KAUTH_DEVICE_GPIO_PINSET,
NULL, NULL, NULL, NULL))
return EPERM;
value = op->gp_value;
if (value != GPIO_PIN_LOW && value != GPIO_PIN_HIGH)
return EINVAL;
gpiobus_pin_write(gc, pin, value);
/* return old value */
op->gp_value = sc->sc_pins[pin].pin_state;
/* update current value */
sc->sc_pins[pin].pin_state = value;
break;
case GPIOPINTOGGLE:
if ((flag & FWRITE) == 0)
return EBADF;
op = (struct gpio_pin_op *)data;
pin = op->gp_pin;
if (pin < 0 || pin >= sc->sc_npins)
return EINVAL;
if (sc->sc_pins[pin].pin_mapped)
return EBUSY;
if (!(sc->sc_pins[pin].pin_flags & GPIO_PIN_SET) &&
kauth_authorize_device(cred, KAUTH_DEVICE_GPIO_PINSET,
NULL, NULL, NULL, NULL))
return EPERM;
value = (sc->sc_pins[pin].pin_state == GPIO_PIN_LOW ?
GPIO_PIN_HIGH : GPIO_PIN_LOW);
gpiobus_pin_write(gc, pin, value);
/* return old value */
op->gp_value = sc->sc_pins[pin].pin_state;
/* update current value */
sc->sc_pins[pin].pin_state = value;
break;
case GPIOPINCTL:
ctl = (struct gpio_pin_ctl *) data;
if (kauth_authorize_device(cred, KAUTH_DEVICE_GPIO_PINSET,
NULL, NULL, NULL, NULL))
return EPERM;
pin = ctl->gp_pin;
if (pin < 0 || pin >= sc->sc_npins)
return EINVAL;
if (sc->sc_pins[pin].pin_mapped)
return EBUSY;
flags = ctl->gp_flags;
/* check that the controller supports all requested flags */
if ((flags & sc->sc_pins[pin].pin_caps) != flags)
return ENODEV;
ctl->gp_caps = sc->sc_pins[pin].pin_caps;
/* return old value */
ctl->gp_flags = sc->sc_pins[pin].pin_flags;
if (flags > 0) {
gpiobus_pin_ctl(gc, pin, flags);
/* update current value */
sc->sc_pins[pin].pin_flags = flags;
}
break;
default:
return ENOTTY;
}
return 0;
}
|