1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2009 Oleksandr Tymoshenko <gonzo@freebsd.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/bus.h> 35 #include <sys/gpio.h> 36 #ifdef INTRNG 37 #include <sys/intr.h> 38 #endif 39 #include <sys/kernel.h> 40 #include <sys/malloc.h> 41 #include <sys/module.h> 42 43 #include <dev/gpio/gpiobusvar.h> 44 45 #include "gpiobus_if.h" 46 47 #undef GPIOBUS_DEBUG 48 #ifdef GPIOBUS_DEBUG 49 #define dprintf printf 50 #else 51 #define dprintf(x, arg...) 52 #endif 53 54 static void gpiobus_print_pins(struct gpiobus_ivar *, char *, size_t); 55 static int gpiobus_parse_pins(struct gpiobus_softc *, device_t, int); 56 static int gpiobus_probe(device_t); 57 static int gpiobus_attach(device_t); 58 static int gpiobus_detach(device_t); 59 static int gpiobus_suspend(device_t); 60 static int gpiobus_resume(device_t); 61 static void gpiobus_probe_nomatch(device_t, device_t); 62 static int gpiobus_print_child(device_t, device_t); 63 static int gpiobus_child_location_str(device_t, device_t, char *, size_t); 64 static int gpiobus_child_pnpinfo_str(device_t, device_t, char *, size_t); 65 static device_t gpiobus_add_child(device_t, u_int, const char *, int); 66 static void gpiobus_hinted_child(device_t, const char *, int); 67 68 /* 69 * GPIOBUS interface 70 */ 71 static int gpiobus_acquire_bus(device_t, device_t, int); 72 static void gpiobus_release_bus(device_t, device_t); 73 static int gpiobus_pin_setflags(device_t, device_t, uint32_t, uint32_t); 74 static int gpiobus_pin_getflags(device_t, device_t, uint32_t, uint32_t*); 75 static int gpiobus_pin_getcaps(device_t, device_t, uint32_t, uint32_t*); 76 static int gpiobus_pin_set(device_t, device_t, uint32_t, unsigned int); 77 static int gpiobus_pin_get(device_t, device_t, uint32_t, unsigned int*); 78 static int gpiobus_pin_toggle(device_t, device_t, uint32_t); 79 80 /* 81 * XXX -> Move me to better place - gpio_subr.c? 82 * Also, this function must be changed when interrupt configuration 83 * data will be moved into struct resource. 84 */ 85 #ifdef INTRNG 86 87 struct resource * 88 gpio_alloc_intr_resource(device_t consumer_dev, int *rid, u_int alloc_flags, 89 gpio_pin_t pin, uint32_t intr_mode) 90 { 91 u_int irq; 92 struct intr_map_data_gpio *gpio_data; 93 struct resource *res; 94 95 gpio_data = (struct intr_map_data_gpio *)intr_alloc_map_data( 96 INTR_MAP_DATA_GPIO, sizeof(*gpio_data), M_WAITOK | M_ZERO); 97 gpio_data->gpio_pin_num = pin->pin; 98 gpio_data->gpio_pin_flags = pin->flags; 99 gpio_data->gpio_intr_mode = intr_mode; 100 101 irq = intr_map_irq(pin->dev, 0, (struct intr_map_data *)gpio_data); 102 res = bus_alloc_resource(consumer_dev, SYS_RES_IRQ, rid, irq, irq, 1, 103 alloc_flags); 104 if (res == NULL) { 105 intr_free_intr_map_data((struct intr_map_data *)gpio_data); 106 return (NULL); 107 } 108 rman_set_virtual(res, gpio_data); 109 return (res); 110 } 111 #else 112 struct resource * 113 gpio_alloc_intr_resource(device_t consumer_dev, int *rid, u_int alloc_flags, 114 gpio_pin_t pin, uint32_t intr_mode) 115 { 116 117 return (NULL); 118 } 119 #endif 120 121 int 122 gpio_check_flags(uint32_t caps, uint32_t flags) 123 { 124 125 /* Filter unwanted flags. */ 126 flags &= caps; 127 128 /* Cannot mix input/output together. */ 129 if (flags & GPIO_PIN_INPUT && flags & GPIO_PIN_OUTPUT) 130 return (EINVAL); 131 /* Cannot mix pull-up/pull-down together. */ 132 if (flags & GPIO_PIN_PULLUP && flags & GPIO_PIN_PULLDOWN) 133 return (EINVAL); 134 135 return (0); 136 } 137 138 static void 139 gpiobus_print_pins(struct gpiobus_ivar *devi, char *buf, size_t buflen) 140 { 141 char tmp[128]; 142 int i, range_start, range_stop, need_coma; 143 144 if (devi->npins == 0) 145 return; 146 147 need_coma = 0; 148 range_start = range_stop = devi->pins[0]; 149 for (i = 1; i < devi->npins; i++) { 150 if (devi->pins[i] != (range_stop + 1)) { 151 if (need_coma) 152 strlcat(buf, ",", buflen); 153 memset(tmp, 0, sizeof(tmp)); 154 if (range_start != range_stop) 155 snprintf(tmp, sizeof(tmp) - 1, "%d-%d", 156 range_start, range_stop); 157 else 158 snprintf(tmp, sizeof(tmp) - 1, "%d", 159 range_start); 160 strlcat(buf, tmp, buflen); 161 162 range_start = range_stop = devi->pins[i]; 163 need_coma = 1; 164 } 165 else 166 range_stop++; 167 } 168 169 if (need_coma) 170 strlcat(buf, ",", buflen); 171 memset(tmp, 0, sizeof(tmp)); 172 if (range_start != range_stop) 173 snprintf(tmp, sizeof(tmp) - 1, "%d-%d", 174 range_start, range_stop); 175 else 176 snprintf(tmp, sizeof(tmp) - 1, "%d", 177 range_start); 178 strlcat(buf, tmp, buflen); 179 } 180 181 device_t 182 gpiobus_attach_bus(device_t dev) 183 { 184 device_t busdev; 185 186 busdev = device_add_child(dev, "gpiobus", -1); 187 if (busdev == NULL) 188 return (NULL); 189 if (device_add_child(dev, "gpioc", -1) == NULL) { 190 device_delete_child(dev, busdev); 191 return (NULL); 192 } 193 #ifdef FDT 194 ofw_gpiobus_register_provider(dev); 195 #endif 196 bus_generic_attach(dev); 197 198 return (busdev); 199 } 200 201 int 202 gpiobus_detach_bus(device_t dev) 203 { 204 int err; 205 206 #ifdef FDT 207 ofw_gpiobus_unregister_provider(dev); 208 #endif 209 err = bus_generic_detach(dev); 210 if (err != 0) 211 return (err); 212 213 return (device_delete_children(dev)); 214 } 215 216 int 217 gpiobus_init_softc(device_t dev) 218 { 219 struct gpiobus_softc *sc; 220 221 sc = GPIOBUS_SOFTC(dev); 222 sc->sc_busdev = dev; 223 sc->sc_dev = device_get_parent(dev); 224 sc->sc_intr_rman.rm_type = RMAN_ARRAY; 225 sc->sc_intr_rman.rm_descr = "GPIO Interrupts"; 226 if (rman_init(&sc->sc_intr_rman) != 0 || 227 rman_manage_region(&sc->sc_intr_rman, 0, ~0) != 0) 228 panic("%s: failed to set up rman.", __func__); 229 230 if (GPIO_PIN_MAX(sc->sc_dev, &sc->sc_npins) != 0) 231 return (ENXIO); 232 233 KASSERT(sc->sc_npins >= 0, ("GPIO device with no pins")); 234 235 /* Pins = GPIO_PIN_MAX() + 1 */ 236 sc->sc_npins++; 237 238 sc->sc_pins = malloc(sizeof(*sc->sc_pins) * sc->sc_npins, M_DEVBUF, 239 M_NOWAIT | M_ZERO); 240 if (sc->sc_pins == NULL) 241 return (ENOMEM); 242 243 /* Initialize the bus lock. */ 244 GPIOBUS_LOCK_INIT(sc); 245 246 return (0); 247 } 248 249 int 250 gpiobus_alloc_ivars(struct gpiobus_ivar *devi) 251 { 252 253 /* Allocate pins and flags memory. */ 254 devi->pins = malloc(sizeof(uint32_t) * devi->npins, M_DEVBUF, 255 M_NOWAIT | M_ZERO); 256 if (devi->pins == NULL) 257 return (ENOMEM); 258 devi->flags = malloc(sizeof(uint32_t) * devi->npins, M_DEVBUF, 259 M_NOWAIT | M_ZERO); 260 if (devi->flags == NULL) { 261 free(devi->pins, M_DEVBUF); 262 return (ENOMEM); 263 } 264 265 return (0); 266 } 267 268 void 269 gpiobus_free_ivars(struct gpiobus_ivar *devi) 270 { 271 272 if (devi->flags) { 273 free(devi->flags, M_DEVBUF); 274 devi->flags = NULL; 275 } 276 if (devi->pins) { 277 free(devi->pins, M_DEVBUF); 278 devi->pins = NULL; 279 } 280 } 281 282 int 283 gpiobus_acquire_pin(device_t bus, uint32_t pin) 284 { 285 struct gpiobus_softc *sc; 286 287 sc = device_get_softc(bus); 288 /* Consistency check. */ 289 if (pin >= sc->sc_npins) { 290 device_printf(bus, 291 "invalid pin %d, max: %d\n", pin, sc->sc_npins - 1); 292 return (-1); 293 } 294 /* Mark pin as mapped and give warning if it's already mapped. */ 295 if (sc->sc_pins[pin].mapped) { 296 device_printf(bus, "warning: pin %d is already mapped\n", pin); 297 return (-1); 298 } 299 sc->sc_pins[pin].mapped = 1; 300 301 return (0); 302 } 303 304 /* Release mapped pin */ 305 int 306 gpiobus_release_pin(device_t bus, uint32_t pin) 307 { 308 struct gpiobus_softc *sc; 309 310 sc = device_get_softc(bus); 311 /* Consistency check. */ 312 if (pin >= sc->sc_npins) { 313 device_printf(bus, 314 "gpiobus_acquire_pin: invalid pin %d, max=%d\n", 315 pin, sc->sc_npins - 1); 316 return (-1); 317 } 318 319 if (!sc->sc_pins[pin].mapped) { 320 device_printf(bus, "gpiobus_acquire_pin: pin %d is not mapped\n", pin); 321 return (-1); 322 } 323 sc->sc_pins[pin].mapped = 0; 324 325 return (0); 326 } 327 328 static int 329 gpiobus_parse_pins(struct gpiobus_softc *sc, device_t child, int mask) 330 { 331 struct gpiobus_ivar *devi = GPIOBUS_IVAR(child); 332 int i, npins; 333 334 npins = 0; 335 for (i = 0; i < 32; i++) { 336 if (mask & (1 << i)) 337 npins++; 338 } 339 if (npins == 0) { 340 device_printf(child, "empty pin mask\n"); 341 return (EINVAL); 342 } 343 devi->npins = npins; 344 if (gpiobus_alloc_ivars(devi) != 0) { 345 device_printf(child, "cannot allocate device ivars\n"); 346 return (EINVAL); 347 } 348 npins = 0; 349 for (i = 0; i < 32; i++) { 350 if ((mask & (1 << i)) == 0) 351 continue; 352 /* Reserve the GPIO pin. */ 353 if (gpiobus_acquire_pin(sc->sc_busdev, i) != 0) { 354 gpiobus_free_ivars(devi); 355 return (EINVAL); 356 } 357 devi->pins[npins++] = i; 358 /* Use the child name as pin name. */ 359 GPIOBUS_PIN_SETNAME(sc->sc_busdev, i, 360 device_get_nameunit(child)); 361 } 362 363 return (0); 364 } 365 366 static int 367 gpiobus_probe(device_t dev) 368 { 369 device_set_desc(dev, "GPIO bus"); 370 371 return (BUS_PROBE_GENERIC); 372 } 373 374 static int 375 gpiobus_attach(device_t dev) 376 { 377 int err; 378 379 err = gpiobus_init_softc(dev); 380 if (err != 0) 381 return (err); 382 383 /* 384 * Get parent's pins and mark them as unmapped 385 */ 386 bus_generic_probe(dev); 387 bus_enumerate_hinted_children(dev); 388 389 return (bus_generic_attach(dev)); 390 } 391 392 /* 393 * Since this is not a self-enumerating bus, and since we always add 394 * children in attach, we have to always delete children here. 395 */ 396 static int 397 gpiobus_detach(device_t dev) 398 { 399 struct gpiobus_softc *sc; 400 struct gpiobus_ivar *devi; 401 device_t *devlist; 402 int i, err, ndevs; 403 404 sc = GPIOBUS_SOFTC(dev); 405 KASSERT(mtx_initialized(&sc->sc_mtx), 406 ("gpiobus mutex not initialized")); 407 GPIOBUS_LOCK_DESTROY(sc); 408 409 if ((err = bus_generic_detach(dev)) != 0) 410 return (err); 411 412 if ((err = device_get_children(dev, &devlist, &ndevs)) != 0) 413 return (err); 414 for (i = 0; i < ndevs; i++) { 415 devi = GPIOBUS_IVAR(devlist[i]); 416 gpiobus_free_ivars(devi); 417 resource_list_free(&devi->rl); 418 free(devi, M_DEVBUF); 419 device_delete_child(dev, devlist[i]); 420 } 421 free(devlist, M_TEMP); 422 rman_fini(&sc->sc_intr_rman); 423 if (sc->sc_pins) { 424 for (i = 0; i < sc->sc_npins; i++) { 425 if (sc->sc_pins[i].name != NULL) 426 free(sc->sc_pins[i].name, M_DEVBUF); 427 sc->sc_pins[i].name = NULL; 428 } 429 free(sc->sc_pins, M_DEVBUF); 430 sc->sc_pins = NULL; 431 } 432 433 return (0); 434 } 435 436 static int 437 gpiobus_suspend(device_t dev) 438 { 439 440 return (bus_generic_suspend(dev)); 441 } 442 443 static int 444 gpiobus_resume(device_t dev) 445 { 446 447 return (bus_generic_resume(dev)); 448 } 449 450 static void 451 gpiobus_probe_nomatch(device_t dev, device_t child) 452 { 453 char pins[128]; 454 struct gpiobus_ivar *devi; 455 456 devi = GPIOBUS_IVAR(child); 457 memset(pins, 0, sizeof(pins)); 458 gpiobus_print_pins(devi, pins, sizeof(pins)); 459 if (devi->npins > 1) 460 device_printf(dev, "<unknown device> at pins %s", pins); 461 else 462 device_printf(dev, "<unknown device> at pin %s", pins); 463 resource_list_print_type(&devi->rl, "irq", SYS_RES_IRQ, "%jd"); 464 printf("\n"); 465 } 466 467 static int 468 gpiobus_print_child(device_t dev, device_t child) 469 { 470 char pins[128]; 471 int retval = 0; 472 struct gpiobus_ivar *devi; 473 474 devi = GPIOBUS_IVAR(child); 475 memset(pins, 0, sizeof(pins)); 476 retval += bus_print_child_header(dev, child); 477 if (devi->npins > 0) { 478 if (devi->npins > 1) 479 retval += printf(" at pins "); 480 else 481 retval += printf(" at pin "); 482 gpiobus_print_pins(devi, pins, sizeof(pins)); 483 retval += printf("%s", pins); 484 } 485 resource_list_print_type(&devi->rl, "irq", SYS_RES_IRQ, "%jd"); 486 retval += bus_print_child_footer(dev, child); 487 488 return (retval); 489 } 490 491 static int 492 gpiobus_child_location_str(device_t bus, device_t child, char *buf, 493 size_t buflen) 494 { 495 struct gpiobus_ivar *devi; 496 497 devi = GPIOBUS_IVAR(child); 498 if (devi->npins > 1) 499 strlcpy(buf, "pins=", buflen); 500 else 501 strlcpy(buf, "pin=", buflen); 502 gpiobus_print_pins(devi, buf, buflen); 503 504 return (0); 505 } 506 507 static int 508 gpiobus_child_pnpinfo_str(device_t bus, device_t child, char *buf, 509 size_t buflen) 510 { 511 512 *buf = '\0'; 513 return (0); 514 } 515 516 static device_t 517 gpiobus_add_child(device_t dev, u_int order, const char *name, int unit) 518 { 519 device_t child; 520 struct gpiobus_ivar *devi; 521 522 child = device_add_child_ordered(dev, order, name, unit); 523 if (child == NULL) 524 return (child); 525 devi = malloc(sizeof(struct gpiobus_ivar), M_DEVBUF, M_NOWAIT | M_ZERO); 526 if (devi == NULL) { 527 device_delete_child(dev, child); 528 return (NULL); 529 } 530 resource_list_init(&devi->rl); 531 device_set_ivars(child, devi); 532 533 return (child); 534 } 535 536 static void 537 gpiobus_hinted_child(device_t bus, const char *dname, int dunit) 538 { 539 struct gpiobus_softc *sc = GPIOBUS_SOFTC(bus); 540 struct gpiobus_ivar *devi; 541 device_t child; 542 int irq, pins; 543 544 child = BUS_ADD_CHILD(bus, 0, dname, dunit); 545 devi = GPIOBUS_IVAR(child); 546 resource_int_value(dname, dunit, "pins", &pins); 547 if (gpiobus_parse_pins(sc, child, pins)) { 548 resource_list_free(&devi->rl); 549 free(devi, M_DEVBUF); 550 device_delete_child(bus, child); 551 } 552 if (resource_int_value(dname, dunit, "irq", &irq) == 0) { 553 if (bus_set_resource(child, SYS_RES_IRQ, 0, irq, 1) != 0) 554 device_printf(bus, 555 "warning: bus_set_resource() failed\n"); 556 } 557 } 558 559 static int 560 gpiobus_set_resource(device_t dev, device_t child, int type, int rid, 561 rman_res_t start, rman_res_t count) 562 { 563 struct gpiobus_ivar *devi; 564 struct resource_list_entry *rle; 565 566 dprintf("%s: entry (%p, %p, %d, %d, %p, %ld)\n", 567 __func__, dev, child, type, rid, (void *)(intptr_t)start, count); 568 devi = GPIOBUS_IVAR(child); 569 rle = resource_list_add(&devi->rl, type, rid, start, 570 start + count - 1, count); 571 if (rle == NULL) 572 return (ENXIO); 573 574 return (0); 575 } 576 577 static struct resource * 578 gpiobus_alloc_resource(device_t bus, device_t child, int type, int *rid, 579 rman_res_t start, rman_res_t end, rman_res_t count, u_int flags) 580 { 581 struct gpiobus_softc *sc; 582 struct resource *rv; 583 struct resource_list *rl; 584 struct resource_list_entry *rle; 585 int isdefault; 586 587 if (type != SYS_RES_IRQ) 588 return (NULL); 589 isdefault = (RMAN_IS_DEFAULT_RANGE(start, end) && count == 1); 590 rle = NULL; 591 if (isdefault) { 592 rl = BUS_GET_RESOURCE_LIST(bus, child); 593 if (rl == NULL) 594 return (NULL); 595 rle = resource_list_find(rl, type, *rid); 596 if (rle == NULL) 597 return (NULL); 598 if (rle->res != NULL) 599 panic("%s: resource entry is busy", __func__); 600 start = rle->start; 601 count = rle->count; 602 end = rle->end; 603 } 604 sc = device_get_softc(bus); 605 rv = rman_reserve_resource(&sc->sc_intr_rman, start, end, count, flags, 606 child); 607 if (rv == NULL) 608 return (NULL); 609 rman_set_rid(rv, *rid); 610 if ((flags & RF_ACTIVE) != 0 && 611 bus_activate_resource(child, type, *rid, rv) != 0) { 612 rman_release_resource(rv); 613 return (NULL); 614 } 615 616 return (rv); 617 } 618 619 static int 620 gpiobus_release_resource(device_t bus __unused, device_t child, int type, 621 int rid, struct resource *r) 622 { 623 int error; 624 625 if (rman_get_flags(r) & RF_ACTIVE) { 626 error = bus_deactivate_resource(child, type, rid, r); 627 if (error) 628 return (error); 629 } 630 631 return (rman_release_resource(r)); 632 } 633 634 static struct resource_list * 635 gpiobus_get_resource_list(device_t bus __unused, device_t child) 636 { 637 struct gpiobus_ivar *ivar; 638 639 ivar = GPIOBUS_IVAR(child); 640 641 return (&ivar->rl); 642 } 643 644 static int 645 gpiobus_acquire_bus(device_t busdev, device_t child, int how) 646 { 647 struct gpiobus_softc *sc; 648 649 sc = device_get_softc(busdev); 650 GPIOBUS_ASSERT_UNLOCKED(sc); 651 GPIOBUS_LOCK(sc); 652 if (sc->sc_owner != NULL) { 653 if (sc->sc_owner == child) 654 panic("%s: %s still owns the bus.", 655 device_get_nameunit(busdev), 656 device_get_nameunit(child)); 657 if (how == GPIOBUS_DONTWAIT) { 658 GPIOBUS_UNLOCK(sc); 659 return (EWOULDBLOCK); 660 } 661 while (sc->sc_owner != NULL) 662 mtx_sleep(sc, &sc->sc_mtx, 0, "gpiobuswait", 0); 663 } 664 sc->sc_owner = child; 665 GPIOBUS_UNLOCK(sc); 666 667 return (0); 668 } 669 670 static void 671 gpiobus_release_bus(device_t busdev, device_t child) 672 { 673 struct gpiobus_softc *sc; 674 675 sc = device_get_softc(busdev); 676 GPIOBUS_ASSERT_UNLOCKED(sc); 677 GPIOBUS_LOCK(sc); 678 if (sc->sc_owner == NULL) 679 panic("%s: %s releasing unowned bus.", 680 device_get_nameunit(busdev), 681 device_get_nameunit(child)); 682 if (sc->sc_owner != child) 683 panic("%s: %s trying to release bus owned by %s", 684 device_get_nameunit(busdev), 685 device_get_nameunit(child), 686 device_get_nameunit(sc->sc_owner)); 687 sc->sc_owner = NULL; 688 wakeup(sc); 689 GPIOBUS_UNLOCK(sc); 690 } 691 692 static int 693 gpiobus_pin_setflags(device_t dev, device_t child, uint32_t pin, 694 uint32_t flags) 695 { 696 struct gpiobus_softc *sc = GPIOBUS_SOFTC(dev); 697 struct gpiobus_ivar *devi = GPIOBUS_IVAR(child); 698 uint32_t caps; 699 700 if (pin >= devi->npins) 701 return (EINVAL); 702 if (GPIO_PIN_GETCAPS(sc->sc_dev, devi->pins[pin], &caps) != 0) 703 return (EINVAL); 704 if (gpio_check_flags(caps, flags) != 0) 705 return (EINVAL); 706 707 return (GPIO_PIN_SETFLAGS(sc->sc_dev, devi->pins[pin], flags)); 708 } 709 710 static int 711 gpiobus_pin_getflags(device_t dev, device_t child, uint32_t pin, 712 uint32_t *flags) 713 { 714 struct gpiobus_softc *sc = GPIOBUS_SOFTC(dev); 715 struct gpiobus_ivar *devi = GPIOBUS_IVAR(child); 716 717 if (pin >= devi->npins) 718 return (EINVAL); 719 720 return GPIO_PIN_GETFLAGS(sc->sc_dev, devi->pins[pin], flags); 721 } 722 723 static int 724 gpiobus_pin_getcaps(device_t dev, device_t child, uint32_t pin, 725 uint32_t *caps) 726 { 727 struct gpiobus_softc *sc = GPIOBUS_SOFTC(dev); 728 struct gpiobus_ivar *devi = GPIOBUS_IVAR(child); 729 730 if (pin >= devi->npins) 731 return (EINVAL); 732 733 return GPIO_PIN_GETCAPS(sc->sc_dev, devi->pins[pin], caps); 734 } 735 736 static int 737 gpiobus_pin_set(device_t dev, device_t child, uint32_t pin, 738 unsigned int value) 739 { 740 struct gpiobus_softc *sc = GPIOBUS_SOFTC(dev); 741 struct gpiobus_ivar *devi = GPIOBUS_IVAR(child); 742 743 if (pin >= devi->npins) 744 return (EINVAL); 745 746 return GPIO_PIN_SET(sc->sc_dev, devi->pins[pin], value); 747 } 748 749 static int 750 gpiobus_pin_get(device_t dev, device_t child, uint32_t pin, 751 unsigned int *value) 752 { 753 struct gpiobus_softc *sc = GPIOBUS_SOFTC(dev); 754 struct gpiobus_ivar *devi = GPIOBUS_IVAR(child); 755 756 if (pin >= devi->npins) 757 return (EINVAL); 758 759 return GPIO_PIN_GET(sc->sc_dev, devi->pins[pin], value); 760 } 761 762 static int 763 gpiobus_pin_toggle(device_t dev, device_t child, uint32_t pin) 764 { 765 struct gpiobus_softc *sc = GPIOBUS_SOFTC(dev); 766 struct gpiobus_ivar *devi = GPIOBUS_IVAR(child); 767 768 if (pin >= devi->npins) 769 return (EINVAL); 770 771 return GPIO_PIN_TOGGLE(sc->sc_dev, devi->pins[pin]); 772 } 773 774 static int 775 gpiobus_pin_getname(device_t dev, uint32_t pin, char *name) 776 { 777 struct gpiobus_softc *sc; 778 779 sc = GPIOBUS_SOFTC(dev); 780 if (pin > sc->sc_npins) 781 return (EINVAL); 782 /* Did we have a name for this pin ? */ 783 if (sc->sc_pins[pin].name != NULL) { 784 memcpy(name, sc->sc_pins[pin].name, GPIOMAXNAME); 785 return (0); 786 } 787 788 /* Return the default pin name. */ 789 return (GPIO_PIN_GETNAME(device_get_parent(dev), pin, name)); 790 } 791 792 static int 793 gpiobus_pin_setname(device_t dev, uint32_t pin, const char *name) 794 { 795 struct gpiobus_softc *sc; 796 797 sc = GPIOBUS_SOFTC(dev); 798 if (pin > sc->sc_npins) 799 return (EINVAL); 800 if (name == NULL) 801 return (EINVAL); 802 /* Save the pin name. */ 803 if (sc->sc_pins[pin].name == NULL) 804 sc->sc_pins[pin].name = malloc(GPIOMAXNAME, M_DEVBUF, 805 M_WAITOK | M_ZERO); 806 strlcpy(sc->sc_pins[pin].name, name, GPIOMAXNAME); 807 808 return (0); 809 } 810 811 static device_method_t gpiobus_methods[] = { 812 /* Device interface */ 813 DEVMETHOD(device_probe, gpiobus_probe), 814 DEVMETHOD(device_attach, gpiobus_attach), 815 DEVMETHOD(device_detach, gpiobus_detach), 816 DEVMETHOD(device_shutdown, bus_generic_shutdown), 817 DEVMETHOD(device_suspend, gpiobus_suspend), 818 DEVMETHOD(device_resume, gpiobus_resume), 819 820 /* Bus interface */ 821 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr), 822 DEVMETHOD(bus_config_intr, bus_generic_config_intr), 823 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr), 824 DEVMETHOD(bus_set_resource, gpiobus_set_resource), 825 DEVMETHOD(bus_alloc_resource, gpiobus_alloc_resource), 826 DEVMETHOD(bus_release_resource, gpiobus_release_resource), 827 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource), 828 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource), 829 DEVMETHOD(bus_get_resource_list, gpiobus_get_resource_list), 830 DEVMETHOD(bus_add_child, gpiobus_add_child), 831 DEVMETHOD(bus_probe_nomatch, gpiobus_probe_nomatch), 832 DEVMETHOD(bus_print_child, gpiobus_print_child), 833 DEVMETHOD(bus_child_pnpinfo_str, gpiobus_child_pnpinfo_str), 834 DEVMETHOD(bus_child_location_str, gpiobus_child_location_str), 835 DEVMETHOD(bus_hinted_child, gpiobus_hinted_child), 836 837 /* GPIO protocol */ 838 DEVMETHOD(gpiobus_acquire_bus, gpiobus_acquire_bus), 839 DEVMETHOD(gpiobus_release_bus, gpiobus_release_bus), 840 DEVMETHOD(gpiobus_pin_getflags, gpiobus_pin_getflags), 841 DEVMETHOD(gpiobus_pin_getcaps, gpiobus_pin_getcaps), 842 DEVMETHOD(gpiobus_pin_setflags, gpiobus_pin_setflags), 843 DEVMETHOD(gpiobus_pin_get, gpiobus_pin_get), 844 DEVMETHOD(gpiobus_pin_set, gpiobus_pin_set), 845 DEVMETHOD(gpiobus_pin_toggle, gpiobus_pin_toggle), 846 DEVMETHOD(gpiobus_pin_getname, gpiobus_pin_getname), 847 DEVMETHOD(gpiobus_pin_setname, gpiobus_pin_setname), 848 849 DEVMETHOD_END 850 }; 851 852 driver_t gpiobus_driver = { 853 "gpiobus", 854 gpiobus_methods, 855 sizeof(struct gpiobus_softc) 856 }; 857 858 devclass_t gpiobus_devclass; 859 860 EARLY_DRIVER_MODULE(gpiobus, gpio, gpiobus_driver, gpiobus_devclass, 0, 0, 861 BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE); 862 MODULE_VERSION(gpiobus, 1); 863