1 /*-
2 * Copyright (c) 2009 Oleksandr Tymoshenko <gonzo@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/bus.h>
33 #include <sys/gpio.h>
34 #include <sys/kernel.h>
35 #include <sys/malloc.h>
36 #include <sys/module.h>
37
38 #include <dev/gpio/gpiobusvar.h>
39
40 #include "gpiobus_if.h"
41
42 #undef GPIOBUS_DEBUG
43 #ifdef GPIOBUS_DEBUG
44 #define dprintf printf
45 #else
46 #define dprintf(x, arg...)
47 #endif
48
49 static void gpiobus_print_pins(struct gpiobus_ivar *, char *, size_t);
50 static int gpiobus_parse_pins(struct gpiobus_softc *, device_t, int);
51 static int gpiobus_probe(device_t);
52 static int gpiobus_attach(device_t);
53 static int gpiobus_detach(device_t);
54 static int gpiobus_suspend(device_t);
55 static int gpiobus_resume(device_t);
56 static void gpiobus_probe_nomatch(device_t, device_t);
57 static int gpiobus_print_child(device_t, device_t);
58 static int gpiobus_child_location_str(device_t, device_t, char *, size_t);
59 static int gpiobus_child_pnpinfo_str(device_t, device_t, char *, size_t);
60 static device_t gpiobus_add_child(device_t, u_int, const char *, int);
61 static void gpiobus_hinted_child(device_t, const char *, int);
62
63 /*
64 * GPIOBUS interface
65 */
66 static int gpiobus_acquire_bus(device_t, device_t, int);
67 static void gpiobus_release_bus(device_t, device_t);
68 static int gpiobus_pin_setflags(device_t, device_t, uint32_t, uint32_t);
69 static int gpiobus_pin_getflags(device_t, device_t, uint32_t, uint32_t*);
70 static int gpiobus_pin_getcaps(device_t, device_t, uint32_t, uint32_t*);
71 static int gpiobus_pin_set(device_t, device_t, uint32_t, unsigned int);
72 static int gpiobus_pin_get(device_t, device_t, uint32_t, unsigned int*);
73 static int gpiobus_pin_toggle(device_t, device_t, uint32_t);
74
75 int
gpio_check_flags(uint32_t caps,uint32_t flags)76 gpio_check_flags(uint32_t caps, uint32_t flags)
77 {
78
79 /* Check for unwanted flags. */
80 if ((flags & caps) == 0 || (flags & caps) != flags)
81 return (EINVAL);
82 /* Cannot mix input/output together. */
83 if (flags & GPIO_PIN_INPUT && flags & GPIO_PIN_OUTPUT)
84 return (EINVAL);
85 /* Cannot mix pull-up/pull-down together. */
86 if (flags & GPIO_PIN_PULLUP && flags & GPIO_PIN_PULLDOWN)
87 return (EINVAL);
88
89 return (0);
90 }
91
92 static void
gpiobus_print_pins(struct gpiobus_ivar * devi,char * buf,size_t buflen)93 gpiobus_print_pins(struct gpiobus_ivar *devi, char *buf, size_t buflen)
94 {
95 char tmp[128];
96 int i, range_start, range_stop, need_coma;
97
98 if (devi->npins == 0)
99 return;
100
101 need_coma = 0;
102 range_start = range_stop = devi->pins[0];
103 for (i = 1; i < devi->npins; i++) {
104 if (devi->pins[i] != (range_stop + 1)) {
105 if (need_coma)
106 strlcat(buf, ",", buflen);
107 memset(tmp, 0, sizeof(tmp));
108 if (range_start != range_stop)
109 snprintf(tmp, sizeof(tmp) - 1, "%d-%d",
110 range_start, range_stop);
111 else
112 snprintf(tmp, sizeof(tmp) - 1, "%d",
113 range_start);
114 strlcat(buf, tmp, buflen);
115
116 range_start = range_stop = devi->pins[i];
117 need_coma = 1;
118 }
119 else
120 range_stop++;
121 }
122
123 if (need_coma)
124 strlcat(buf, ",", buflen);
125 memset(tmp, 0, sizeof(tmp));
126 if (range_start != range_stop)
127 snprintf(tmp, sizeof(tmp) - 1, "%d-%d",
128 range_start, range_stop);
129 else
130 snprintf(tmp, sizeof(tmp) - 1, "%d",
131 range_start);
132 strlcat(buf, tmp, buflen);
133 }
134
135 device_t
gpiobus_attach_bus(device_t dev)136 gpiobus_attach_bus(device_t dev)
137 {
138 device_t busdev;
139
140 busdev = device_add_child(dev, "gpiobus", -1);
141 if (busdev == NULL)
142 return (NULL);
143 if (device_add_child(dev, "gpioc", -1) == NULL) {
144 device_delete_child(dev, busdev);
145 return (NULL);
146 }
147 #ifdef FDT
148 ofw_gpiobus_register_provider(dev);
149 #endif
150 bus_generic_attach(dev);
151
152 return (busdev);
153 }
154
155 int
gpiobus_detach_bus(device_t dev)156 gpiobus_detach_bus(device_t dev)
157 {
158 int err;
159
160 #ifdef FDT
161 ofw_gpiobus_unregister_provider(dev);
162 #endif
163 err = bus_generic_detach(dev);
164 if (err != 0)
165 return (err);
166
167 return (device_delete_children(dev));
168 }
169
170 int
gpiobus_init_softc(device_t dev)171 gpiobus_init_softc(device_t dev)
172 {
173 struct gpiobus_softc *sc;
174
175 sc = GPIOBUS_SOFTC(dev);
176 sc->sc_busdev = dev;
177 sc->sc_dev = device_get_parent(dev);
178 sc->sc_intr_rman.rm_type = RMAN_ARRAY;
179 sc->sc_intr_rman.rm_descr = "GPIO Interrupts";
180 if (rman_init(&sc->sc_intr_rman) != 0 ||
181 rman_manage_region(&sc->sc_intr_rman, 0, ~0) != 0)
182 panic("%s: failed to set up rman.", __func__);
183
184 if (GPIO_PIN_MAX(sc->sc_dev, &sc->sc_npins) != 0)
185 return (ENXIO);
186
187 KASSERT(sc->sc_npins != 0, ("GPIO device with no pins"));
188
189 /* Pins = GPIO_PIN_MAX() + 1 */
190 sc->sc_npins++;
191
192 sc->sc_pins = malloc(sizeof(*sc->sc_pins) * sc->sc_npins, M_DEVBUF,
193 M_NOWAIT | M_ZERO);
194 if (sc->sc_pins == NULL)
195 return (ENOMEM);
196
197 /* Initialize the bus lock. */
198 GPIOBUS_LOCK_INIT(sc);
199
200 return (0);
201 }
202
203 int
gpiobus_alloc_ivars(struct gpiobus_ivar * devi)204 gpiobus_alloc_ivars(struct gpiobus_ivar *devi)
205 {
206
207 /* Allocate pins and flags memory. */
208 devi->pins = malloc(sizeof(uint32_t) * devi->npins, M_DEVBUF,
209 M_NOWAIT | M_ZERO);
210 if (devi->pins == NULL)
211 return (ENOMEM);
212 devi->flags = malloc(sizeof(uint32_t) * devi->npins, M_DEVBUF,
213 M_NOWAIT | M_ZERO);
214 if (devi->flags == NULL) {
215 free(devi->pins, M_DEVBUF);
216 return (ENOMEM);
217 }
218
219 return (0);
220 }
221
222 void
gpiobus_free_ivars(struct gpiobus_ivar * devi)223 gpiobus_free_ivars(struct gpiobus_ivar *devi)
224 {
225
226 if (devi->flags) {
227 free(devi->flags, M_DEVBUF);
228 devi->flags = NULL;
229 }
230 if (devi->pins) {
231 free(devi->pins, M_DEVBUF);
232 devi->pins = NULL;
233 }
234 }
235
236 int
gpiobus_map_pin(device_t bus,uint32_t pin)237 gpiobus_map_pin(device_t bus, uint32_t pin)
238 {
239 struct gpiobus_softc *sc;
240
241 sc = device_get_softc(bus);
242 /* Consistency check. */
243 if (pin >= sc->sc_npins) {
244 device_printf(bus,
245 "invalid pin %d, max: %d\n", pin, sc->sc_npins - 1);
246 return (-1);
247 }
248 /* Mark pin as mapped and give warning if it's already mapped. */
249 if (sc->sc_pins[pin].mapped) {
250 device_printf(bus, "warning: pin %d is already mapped\n", pin);
251 return (-1);
252 }
253 sc->sc_pins[pin].mapped = 1;
254
255 return (0);
256 }
257
258 static int
gpiobus_parse_pins(struct gpiobus_softc * sc,device_t child,int mask)259 gpiobus_parse_pins(struct gpiobus_softc *sc, device_t child, int mask)
260 {
261 struct gpiobus_ivar *devi = GPIOBUS_IVAR(child);
262 int i, npins;
263
264 npins = 0;
265 for (i = 0; i < 32; i++) {
266 if (mask & (1 << i))
267 npins++;
268 }
269 if (npins == 0) {
270 device_printf(child, "empty pin mask\n");
271 return (EINVAL);
272 }
273 devi->npins = npins;
274 if (gpiobus_alloc_ivars(devi) != 0) {
275 device_printf(child, "cannot allocate device ivars\n");
276 return (EINVAL);
277 }
278 npins = 0;
279 for (i = 0; i < 32; i++) {
280 if ((mask & (1 << i)) == 0)
281 continue;
282 /* Reserve the GPIO pin. */
283 if (gpiobus_map_pin(sc->sc_busdev, i) != 0) {
284 gpiobus_free_ivars(devi);
285 return (EINVAL);
286 }
287 devi->pins[npins++] = i;
288 /* Use the child name as pin name. */
289 GPIOBUS_PIN_SETNAME(sc->sc_busdev, i,
290 device_get_nameunit(child));
291 }
292
293 return (0);
294 }
295
296 static int
gpiobus_probe(device_t dev)297 gpiobus_probe(device_t dev)
298 {
299 device_set_desc(dev, "GPIO bus");
300
301 return (BUS_PROBE_GENERIC);
302 }
303
304 static int
gpiobus_attach(device_t dev)305 gpiobus_attach(device_t dev)
306 {
307 int err;
308
309 err = gpiobus_init_softc(dev);
310 if (err != 0)
311 return (err);
312
313 /*
314 * Get parent's pins and mark them as unmapped
315 */
316 bus_generic_probe(dev);
317 bus_enumerate_hinted_children(dev);
318
319 return (bus_generic_attach(dev));
320 }
321
322 /*
323 * Since this is not a self-enumerating bus, and since we always add
324 * children in attach, we have to always delete children here.
325 */
326 static int
gpiobus_detach(device_t dev)327 gpiobus_detach(device_t dev)
328 {
329 struct gpiobus_softc *sc;
330 struct gpiobus_ivar *devi;
331 device_t *devlist;
332 int i, err, ndevs;
333
334 sc = GPIOBUS_SOFTC(dev);
335 KASSERT(mtx_initialized(&sc->sc_mtx),
336 ("gpiobus mutex not initialized"));
337 GPIOBUS_LOCK_DESTROY(sc);
338
339 if ((err = bus_generic_detach(dev)) != 0)
340 return (err);
341
342 if ((err = device_get_children(dev, &devlist, &ndevs)) != 0)
343 return (err);
344 for (i = 0; i < ndevs; i++) {
345 devi = GPIOBUS_IVAR(devlist[i]);
346 gpiobus_free_ivars(devi);
347 resource_list_free(&devi->rl);
348 free(devi, M_DEVBUF);
349 device_delete_child(dev, devlist[i]);
350 }
351 free(devlist, M_TEMP);
352 rman_fini(&sc->sc_intr_rman);
353 if (sc->sc_pins) {
354 for (i = 0; i < sc->sc_npins; i++) {
355 if (sc->sc_pins[i].name != NULL)
356 free(sc->sc_pins[i].name, M_DEVBUF);
357 sc->sc_pins[i].name = NULL;
358 }
359 free(sc->sc_pins, M_DEVBUF);
360 sc->sc_pins = NULL;
361 }
362
363 return (0);
364 }
365
366 static int
gpiobus_suspend(device_t dev)367 gpiobus_suspend(device_t dev)
368 {
369
370 return (bus_generic_suspend(dev));
371 }
372
373 static int
gpiobus_resume(device_t dev)374 gpiobus_resume(device_t dev)
375 {
376
377 return (bus_generic_resume(dev));
378 }
379
380 static void
gpiobus_probe_nomatch(device_t dev,device_t child)381 gpiobus_probe_nomatch(device_t dev, device_t child)
382 {
383 char pins[128];
384 struct gpiobus_ivar *devi;
385
386 devi = GPIOBUS_IVAR(child);
387 memset(pins, 0, sizeof(pins));
388 gpiobus_print_pins(devi, pins, sizeof(pins));
389 if (devi->npins > 1)
390 device_printf(dev, "<unknown device> at pins %s", pins);
391 else
392 device_printf(dev, "<unknown device> at pin %s", pins);
393 resource_list_print_type(&devi->rl, "irq", SYS_RES_IRQ, "%ld");
394 printf("\n");
395 }
396
397 static int
gpiobus_print_child(device_t dev,device_t child)398 gpiobus_print_child(device_t dev, device_t child)
399 {
400 char pins[128];
401 int retval = 0;
402 struct gpiobus_ivar *devi;
403
404 devi = GPIOBUS_IVAR(child);
405 memset(pins, 0, sizeof(pins));
406 retval += bus_print_child_header(dev, child);
407 if (devi->npins > 0) {
408 if (devi->npins > 1)
409 retval += printf(" at pins ");
410 else
411 retval += printf(" at pin ");
412 gpiobus_print_pins(devi, pins, sizeof(pins));
413 retval += printf("%s", pins);
414 }
415 resource_list_print_type(&devi->rl, "irq", SYS_RES_IRQ, "%ld");
416 retval += bus_print_child_footer(dev, child);
417
418 return (retval);
419 }
420
421 static int
gpiobus_child_location_str(device_t bus,device_t child,char * buf,size_t buflen)422 gpiobus_child_location_str(device_t bus, device_t child, char *buf,
423 size_t buflen)
424 {
425 struct gpiobus_ivar *devi;
426
427 devi = GPIOBUS_IVAR(child);
428 if (devi->npins > 1)
429 strlcpy(buf, "pins=", buflen);
430 else
431 strlcpy(buf, "pin=", buflen);
432 gpiobus_print_pins(devi, buf, buflen);
433
434 return (0);
435 }
436
437 static int
gpiobus_child_pnpinfo_str(device_t bus,device_t child,char * buf,size_t buflen)438 gpiobus_child_pnpinfo_str(device_t bus, device_t child, char *buf,
439 size_t buflen)
440 {
441
442 *buf = '\0';
443 return (0);
444 }
445
446 static device_t
gpiobus_add_child(device_t dev,u_int order,const char * name,int unit)447 gpiobus_add_child(device_t dev, u_int order, const char *name, int unit)
448 {
449 device_t child;
450 struct gpiobus_ivar *devi;
451
452 child = device_add_child_ordered(dev, order, name, unit);
453 if (child == NULL)
454 return (child);
455 devi = malloc(sizeof(struct gpiobus_ivar), M_DEVBUF, M_NOWAIT | M_ZERO);
456 if (devi == NULL) {
457 device_delete_child(dev, child);
458 return (NULL);
459 }
460 resource_list_init(&devi->rl);
461 device_set_ivars(child, devi);
462
463 return (child);
464 }
465
466 static void
gpiobus_hinted_child(device_t bus,const char * dname,int dunit)467 gpiobus_hinted_child(device_t bus, const char *dname, int dunit)
468 {
469 struct gpiobus_softc *sc = GPIOBUS_SOFTC(bus);
470 struct gpiobus_ivar *devi;
471 device_t child;
472 int irq, pins;
473
474 child = BUS_ADD_CHILD(bus, 0, dname, dunit);
475 devi = GPIOBUS_IVAR(child);
476 resource_int_value(dname, dunit, "pins", &pins);
477 if (gpiobus_parse_pins(sc, child, pins)) {
478 resource_list_free(&devi->rl);
479 free(devi, M_DEVBUF);
480 device_delete_child(bus, child);
481 }
482 if (resource_int_value(dname, dunit, "irq", &irq) == 0) {
483 if (bus_set_resource(child, SYS_RES_IRQ, 0, irq, 1) != 0)
484 device_printf(bus,
485 "warning: bus_set_resource() failed\n");
486 }
487 }
488
489 static int
gpiobus_set_resource(device_t dev,device_t child,int type,int rid,u_long start,u_long count)490 gpiobus_set_resource(device_t dev, device_t child, int type, int rid,
491 u_long start, u_long count)
492 {
493 struct gpiobus_ivar *devi;
494 struct resource_list_entry *rle;
495
496 dprintf("%s: entry (%p, %p, %d, %d, %p, %ld)\n",
497 __func__, dev, child, type, rid, (void *)(intptr_t)start, count);
498 devi = GPIOBUS_IVAR(child);
499 rle = resource_list_add(&devi->rl, type, rid, start,
500 start + count - 1, count);
501 if (rle == NULL)
502 return (ENXIO);
503
504 return (0);
505 }
506
507 static struct resource *
gpiobus_alloc_resource(device_t bus,device_t child,int type,int * rid,u_long start,u_long end,u_long count,u_int flags)508 gpiobus_alloc_resource(device_t bus, device_t child, int type, int *rid,
509 u_long start, u_long end, u_long count, u_int flags)
510 {
511 struct gpiobus_softc *sc;
512 struct resource *rv;
513 struct resource_list *rl;
514 struct resource_list_entry *rle;
515 int isdefault;
516
517 if (type != SYS_RES_IRQ)
518 return (NULL);
519 isdefault = (start == 0UL && end == ~0UL && count == 1);
520 rle = NULL;
521 if (isdefault) {
522 rl = BUS_GET_RESOURCE_LIST(bus, child);
523 if (rl == NULL)
524 return (NULL);
525 rle = resource_list_find(rl, type, *rid);
526 if (rle == NULL)
527 return (NULL);
528 if (rle->res != NULL)
529 panic("%s: resource entry is busy", __func__);
530 start = rle->start;
531 count = rle->count;
532 end = rle->end;
533 }
534 sc = device_get_softc(bus);
535 rv = rman_reserve_resource(&sc->sc_intr_rman, start, end, count, flags,
536 child);
537 if (rv == NULL)
538 return (NULL);
539 rman_set_rid(rv, *rid);
540 if ((flags & RF_ACTIVE) != 0 &&
541 bus_activate_resource(child, type, *rid, rv) != 0) {
542 rman_release_resource(rv);
543 return (NULL);
544 }
545
546 return (rv);
547 }
548
549 static int
gpiobus_release_resource(device_t bus __unused,device_t child,int type,int rid,struct resource * r)550 gpiobus_release_resource(device_t bus __unused, device_t child, int type,
551 int rid, struct resource *r)
552 {
553 int error;
554
555 if (rman_get_flags(r) & RF_ACTIVE) {
556 error = bus_deactivate_resource(child, type, rid, r);
557 if (error)
558 return (error);
559 }
560
561 return (rman_release_resource(r));
562 }
563
564 static struct resource_list *
gpiobus_get_resource_list(device_t bus __unused,device_t child)565 gpiobus_get_resource_list(device_t bus __unused, device_t child)
566 {
567 struct gpiobus_ivar *ivar;
568
569 ivar = GPIOBUS_IVAR(child);
570
571 return (&ivar->rl);
572 }
573
574 static int
gpiobus_acquire_bus(device_t busdev,device_t child,int how)575 gpiobus_acquire_bus(device_t busdev, device_t child, int how)
576 {
577 struct gpiobus_softc *sc;
578
579 sc = device_get_softc(busdev);
580 GPIOBUS_ASSERT_UNLOCKED(sc);
581 GPIOBUS_LOCK(sc);
582 if (sc->sc_owner != NULL) {
583 if (sc->sc_owner == child)
584 panic("%s: %s still owns the bus.",
585 device_get_nameunit(busdev),
586 device_get_nameunit(child));
587 if (how == GPIOBUS_DONTWAIT) {
588 GPIOBUS_UNLOCK(sc);
589 return (EWOULDBLOCK);
590 }
591 while (sc->sc_owner != NULL)
592 mtx_sleep(sc, &sc->sc_mtx, 0, "gpiobuswait", 0);
593 }
594 sc->sc_owner = child;
595 GPIOBUS_UNLOCK(sc);
596
597 return (0);
598 }
599
600 static void
gpiobus_release_bus(device_t busdev,device_t child)601 gpiobus_release_bus(device_t busdev, device_t child)
602 {
603 struct gpiobus_softc *sc;
604
605 sc = device_get_softc(busdev);
606 GPIOBUS_ASSERT_UNLOCKED(sc);
607 GPIOBUS_LOCK(sc);
608 if (sc->sc_owner == NULL)
609 panic("%s: %s releasing unowned bus.",
610 device_get_nameunit(busdev),
611 device_get_nameunit(child));
612 if (sc->sc_owner != child)
613 panic("%s: %s trying to release bus owned by %s",
614 device_get_nameunit(busdev),
615 device_get_nameunit(child),
616 device_get_nameunit(sc->sc_owner));
617 sc->sc_owner = NULL;
618 wakeup(sc);
619 GPIOBUS_UNLOCK(sc);
620 }
621
622 static int
gpiobus_pin_setflags(device_t dev,device_t child,uint32_t pin,uint32_t flags)623 gpiobus_pin_setflags(device_t dev, device_t child, uint32_t pin,
624 uint32_t flags)
625 {
626 struct gpiobus_softc *sc = GPIOBUS_SOFTC(dev);
627 struct gpiobus_ivar *devi = GPIOBUS_IVAR(child);
628 uint32_t caps;
629
630 if (pin >= devi->npins)
631 return (EINVAL);
632 if (GPIO_PIN_GETCAPS(sc->sc_dev, devi->pins[pin], &caps) != 0)
633 return (EINVAL);
634 if (gpio_check_flags(caps, flags) != 0)
635 return (EINVAL);
636
637 return (GPIO_PIN_SETFLAGS(sc->sc_dev, devi->pins[pin], flags));
638 }
639
640 static int
gpiobus_pin_getflags(device_t dev,device_t child,uint32_t pin,uint32_t * flags)641 gpiobus_pin_getflags(device_t dev, device_t child, uint32_t pin,
642 uint32_t *flags)
643 {
644 struct gpiobus_softc *sc = GPIOBUS_SOFTC(dev);
645 struct gpiobus_ivar *devi = GPIOBUS_IVAR(child);
646
647 if (pin >= devi->npins)
648 return (EINVAL);
649
650 return GPIO_PIN_GETFLAGS(sc->sc_dev, devi->pins[pin], flags);
651 }
652
653 static int
gpiobus_pin_getcaps(device_t dev,device_t child,uint32_t pin,uint32_t * caps)654 gpiobus_pin_getcaps(device_t dev, device_t child, uint32_t pin,
655 uint32_t *caps)
656 {
657 struct gpiobus_softc *sc = GPIOBUS_SOFTC(dev);
658 struct gpiobus_ivar *devi = GPIOBUS_IVAR(child);
659
660 if (pin >= devi->npins)
661 return (EINVAL);
662
663 return GPIO_PIN_GETCAPS(sc->sc_dev, devi->pins[pin], caps);
664 }
665
666 static int
gpiobus_pin_set(device_t dev,device_t child,uint32_t pin,unsigned int value)667 gpiobus_pin_set(device_t dev, device_t child, uint32_t pin,
668 unsigned int value)
669 {
670 struct gpiobus_softc *sc = GPIOBUS_SOFTC(dev);
671 struct gpiobus_ivar *devi = GPIOBUS_IVAR(child);
672
673 if (pin >= devi->npins)
674 return (EINVAL);
675
676 return GPIO_PIN_SET(sc->sc_dev, devi->pins[pin], value);
677 }
678
679 static int
gpiobus_pin_get(device_t dev,device_t child,uint32_t pin,unsigned int * value)680 gpiobus_pin_get(device_t dev, device_t child, uint32_t pin,
681 unsigned int *value)
682 {
683 struct gpiobus_softc *sc = GPIOBUS_SOFTC(dev);
684 struct gpiobus_ivar *devi = GPIOBUS_IVAR(child);
685
686 if (pin >= devi->npins)
687 return (EINVAL);
688
689 return GPIO_PIN_GET(sc->sc_dev, devi->pins[pin], value);
690 }
691
692 static int
gpiobus_pin_toggle(device_t dev,device_t child,uint32_t pin)693 gpiobus_pin_toggle(device_t dev, device_t child, uint32_t pin)
694 {
695 struct gpiobus_softc *sc = GPIOBUS_SOFTC(dev);
696 struct gpiobus_ivar *devi = GPIOBUS_IVAR(child);
697
698 if (pin >= devi->npins)
699 return (EINVAL);
700
701 return GPIO_PIN_TOGGLE(sc->sc_dev, devi->pins[pin]);
702 }
703
704 static int
gpiobus_pin_getname(device_t dev,uint32_t pin,char * name)705 gpiobus_pin_getname(device_t dev, uint32_t pin, char *name)
706 {
707 struct gpiobus_softc *sc;
708
709 sc = GPIOBUS_SOFTC(dev);
710 if (pin > sc->sc_npins)
711 return (EINVAL);
712 /* Did we have a name for this pin ? */
713 if (sc->sc_pins[pin].name != NULL) {
714 memcpy(name, sc->sc_pins[pin].name, GPIOMAXNAME);
715 return (0);
716 }
717
718 /* Return the default pin name. */
719 return (GPIO_PIN_GETNAME(device_get_parent(dev), pin, name));
720 }
721
722 static int
gpiobus_pin_setname(device_t dev,uint32_t pin,const char * name)723 gpiobus_pin_setname(device_t dev, uint32_t pin, const char *name)
724 {
725 struct gpiobus_softc *sc;
726
727 sc = GPIOBUS_SOFTC(dev);
728 if (pin > sc->sc_npins)
729 return (EINVAL);
730 if (name == NULL)
731 return (EINVAL);
732 /* Save the pin name. */
733 if (sc->sc_pins[pin].name == NULL)
734 sc->sc_pins[pin].name = malloc(GPIOMAXNAME, M_DEVBUF,
735 M_WAITOK | M_ZERO);
736 strlcpy(sc->sc_pins[pin].name, name, GPIOMAXNAME);
737
738 return (0);
739 }
740
741 static device_method_t gpiobus_methods[] = {
742 /* Device interface */
743 DEVMETHOD(device_probe, gpiobus_probe),
744 DEVMETHOD(device_attach, gpiobus_attach),
745 DEVMETHOD(device_detach, gpiobus_detach),
746 DEVMETHOD(device_shutdown, bus_generic_shutdown),
747 DEVMETHOD(device_suspend, gpiobus_suspend),
748 DEVMETHOD(device_resume, gpiobus_resume),
749
750 /* Bus interface */
751 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
752 DEVMETHOD(bus_config_intr, bus_generic_config_intr),
753 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
754 DEVMETHOD(bus_set_resource, gpiobus_set_resource),
755 DEVMETHOD(bus_alloc_resource, gpiobus_alloc_resource),
756 DEVMETHOD(bus_release_resource, gpiobus_release_resource),
757 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
758 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
759 DEVMETHOD(bus_get_resource_list, gpiobus_get_resource_list),
760 DEVMETHOD(bus_add_child, gpiobus_add_child),
761 DEVMETHOD(bus_probe_nomatch, gpiobus_probe_nomatch),
762 DEVMETHOD(bus_print_child, gpiobus_print_child),
763 DEVMETHOD(bus_child_pnpinfo_str, gpiobus_child_pnpinfo_str),
764 DEVMETHOD(bus_child_location_str, gpiobus_child_location_str),
765 DEVMETHOD(bus_hinted_child, gpiobus_hinted_child),
766
767 /* GPIO protocol */
768 DEVMETHOD(gpiobus_acquire_bus, gpiobus_acquire_bus),
769 DEVMETHOD(gpiobus_release_bus, gpiobus_release_bus),
770 DEVMETHOD(gpiobus_pin_getflags, gpiobus_pin_getflags),
771 DEVMETHOD(gpiobus_pin_getcaps, gpiobus_pin_getcaps),
772 DEVMETHOD(gpiobus_pin_setflags, gpiobus_pin_setflags),
773 DEVMETHOD(gpiobus_pin_get, gpiobus_pin_get),
774 DEVMETHOD(gpiobus_pin_set, gpiobus_pin_set),
775 DEVMETHOD(gpiobus_pin_toggle, gpiobus_pin_toggle),
776 DEVMETHOD(gpiobus_pin_getname, gpiobus_pin_getname),
777 DEVMETHOD(gpiobus_pin_setname, gpiobus_pin_setname),
778
779 DEVMETHOD_END
780 };
781
782 driver_t gpiobus_driver = {
783 "gpiobus",
784 gpiobus_methods,
785 sizeof(struct gpiobus_softc)
786 };
787
788 devclass_t gpiobus_devclass;
789
790 DRIVER_MODULE(gpiobus, gpio, gpiobus_driver, gpiobus_devclass, 0, 0);
791 MODULE_VERSION(gpiobus, 1);
792