gpio.c revision 1.50
1 /* $NetBSD: gpio.c,v 1.50 2011/11/25 13:49:43 mbalmer Exp $ */ 2 /* $OpenBSD: gpio.c,v 1.6 2006/01/14 12:33:49 grange Exp $ */ 3 4 /* 5 * Copyright (c) 2008, 2009, 2010, 2011 Marc Balmer <marc (at) msys.ch> 6 * Copyright (c) 2004, 2006 Alexander Yurchenko <grange (at) openbsd.org> 7 * 8 * Permission to use, copy, modify, and distribute this software for any 9 * purpose with or without fee is hereby granted, provided that the above 10 * copyright notice and this permission notice appear in all copies. 11 * 12 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 13 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 14 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 15 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 16 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 17 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 18 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 19 */ 20 21 #include <sys/cdefs.h> 22 __KERNEL_RCSID(0, "$NetBSD: gpio.c,v 1.50 2011/11/25 13:49:43 mbalmer Exp $"); 23 24 /* 25 * General Purpose Input/Output framework. 26 */ 27 28 #include <sys/param.h> 29 #include <sys/callout.h> 30 #include <sys/systm.h> 31 #include <sys/conf.h> 32 #include <sys/device.h> 33 #include <sys/fcntl.h> 34 #include <sys/ioctl.h> 35 #include <sys/gpio.h> 36 #include <sys/kernel.h> 37 #include <sys/vnode.h> 38 #include <sys/kmem.h> 39 #include <sys/mutex.h> 40 #include <sys/condvar.h> 41 #include <sys/queue.h> 42 #include <sys/kauth.h> 43 #include <sys/module.h> 44 #include <dev/gpio/gpiovar.h> 45 46 #include "locators.h" 47 48 #ifdef GPIO_DEBUG 49 #define DPRINTFN(n, x) do { if (gpiodebug > (n)) printf x; } while (0) 50 int gpiodebug = 0; 51 #else 52 #define DPRINTFN(n, x) 53 #endif 54 #define DPRINTF(x) DPRINTFN(0, x) 55 56 struct gpio_softc { 57 device_t sc_dev; 58 59 gpio_chipset_tag_t sc_gc; /* GPIO controller */ 60 gpio_pin_t *sc_pins; /* pins array */ 61 int sc_npins; /* number of pins */ 62 63 kmutex_t sc_mtx; 64 kcondvar_t sc_ioctl; /* ioctl in progress */ 65 int sc_ioctl_busy; /* ioctl is busy */ 66 kcondvar_t sc_attach; /* attach/detach in progress */ 67 int sc_attach_busy;/* busy in attach/detach */ 68 #ifdef COMPAT_50 69 LIST_HEAD(, gpio_dev) sc_devs; /* devices */ 70 #endif 71 LIST_HEAD(, gpio_name) sc_names; /* named pins */ 72 }; 73 74 static int gpio_match(device_t, cfdata_t, void *); 75 int gpio_submatch(device_t, cfdata_t, const int *, void *); 76 static void gpio_attach(device_t, device_t, void *); 77 static int gpio_rescan(device_t, const char *, const int *); 78 static void gpio_childdetached(device_t, device_t); 79 static bool gpio_resume(device_t, const pmf_qual_t *); 80 static int gpio_detach(device_t, int); 81 static int gpio_search(device_t, cfdata_t, const int *, void *); 82 static int gpio_print(void *, const char *); 83 static int gpio_pinbyname(struct gpio_softc *, char *); 84 static int gpio_ioctl(struct gpio_softc *, u_long, void *, int, 85 struct lwp *); 86 87 #ifdef COMPAT_50 88 /* Old API */ 89 static int gpio_ioctl_oapi(struct gpio_softc *, u_long, void *, int, 90 kauth_cred_t); 91 #endif 92 93 CFATTACH_DECL3_NEW(gpio, sizeof(struct gpio_softc), 94 gpio_match, gpio_attach, gpio_detach, NULL, gpio_rescan, 95 gpio_childdetached, DVF_DETACH_SHUTDOWN); 96 97 dev_type_open(gpioopen); 98 dev_type_close(gpioclose); 99 dev_type_ioctl(gpioioctl); 100 dev_type_ioctl(gpioioctl_locked); 101 102 const struct cdevsw gpio_cdevsw = { 103 gpioopen, gpioclose, noread, nowrite, gpioioctl, 104 nostop, notty, nopoll, nommap, nokqfilter, D_OTHER | D_MPSAFE 105 }; 106 107 extern struct cfdriver gpio_cd; 108 109 static int 110 gpio_match(device_t parent, cfdata_t cf, void *aux) 111 { 112 return 1; 113 } 114 115 int 116 gpio_submatch(device_t parent, cfdata_t cf, const int *ip, void *aux) 117 { 118 struct gpio_attach_args *ga = aux; 119 120 if (ga->ga_offset == -1) 121 return 0; 122 123 return strcmp(ga->ga_dvname, cf->cf_name) == 0; 124 } 125 126 static bool 127 gpio_resume(device_t self, const pmf_qual_t *qual) 128 { 129 struct gpio_softc *sc = device_private(self); 130 int pin; 131 132 for (pin = 0; pin < sc->sc_npins; pin++) { 133 gpiobus_pin_ctl(sc->sc_gc, pin, sc->sc_pins[pin].pin_flags); 134 gpiobus_pin_write(sc->sc_gc, pin, sc->sc_pins[pin].pin_state); 135 } 136 return true; 137 } 138 139 static void 140 gpio_childdetached(device_t self, device_t child) 141 { 142 #ifdef COMPAT_50 143 struct gpio_dev *gdev; 144 struct gpio_softc *sc; 145 int error; 146 147 /* 148 * gpio_childetached is serialized because it can be entered in 149 * different ways concurrently, e.g. via the GPIODETACH ioctl and 150 * drvctl(8) or modunload(8). 151 */ 152 sc = device_private(self); 153 error = 0; 154 mutex_enter(&sc->sc_mtx); 155 while (sc->sc_attach_busy) { 156 error = cv_wait_sig(&sc->sc_attach, &sc->sc_mtx); 157 if (error) 158 break; 159 } 160 if (!error) 161 sc->sc_attach_busy = 1; 162 mutex_exit(&sc->sc_mtx); 163 if (error) 164 return; 165 166 LIST_FOREACH(gdev, &sc->sc_devs, sc_next) 167 if (gdev->sc_dev == child) { 168 LIST_REMOVE(gdev, sc_next); 169 kmem_free(gdev, sizeof(struct gpio_dev)); 170 break; 171 } 172 173 mutex_enter(&sc->sc_mtx); 174 sc->sc_attach_busy = 0; 175 cv_signal(&sc->sc_attach); 176 mutex_exit(&sc->sc_mtx); 177 #endif 178 } 179 180 static int 181 gpio_rescan(device_t self, const char *ifattr, const int *locators) 182 { 183 struct gpio_softc *sc = device_private(self); 184 185 config_search_loc(gpio_search, self, ifattr, locators, sc); 186 187 return 0; 188 } 189 190 static void 191 gpio_attach(device_t parent, device_t self, void *aux) 192 { 193 struct gpio_softc *sc = device_private(self); 194 struct gpiobus_attach_args *gba = aux; 195 196 sc->sc_dev = self; 197 sc->sc_gc = gba->gba_gc; 198 sc->sc_pins = gba->gba_pins; 199 sc->sc_npins = gba->gba_npins; 200 201 printf(": %d pins\n", sc->sc_npins); 202 203 if (!pmf_device_register(self, NULL, gpio_resume)) 204 aprint_error_dev(self, "couldn't establish power handler\n"); 205 mutex_init(&sc->sc_mtx, MUTEX_DEFAULT, IPL_VM); 206 cv_init(&sc->sc_ioctl, "gpioctl"); 207 cv_init(&sc->sc_attach, "gpioatch"); 208 /* 209 * Attach all devices that can be connected to the GPIO pins 210 * described in the kernel configuration file. 211 */ 212 gpio_rescan(self, "gpio", NULL); 213 } 214 215 static int 216 gpio_detach(device_t self, int flags) 217 { 218 struct gpio_softc *sc; 219 int rc; 220 221 sc = device_private(self); 222 223 if ((rc = config_detach_children(self, flags)) != 0) 224 return rc; 225 mutex_destroy(&sc->sc_mtx); 226 cv_destroy(&sc->sc_ioctl); 227 #if 0 228 int maj, mn; 229 230 /* Locate the major number */ 231 for (maj = 0; maj < nchrdev; maj++) 232 if (cdevsw[maj].d_open == gpioopen) 233 break; 234 235 /* Nuke the vnodes for any open instances (calls close) */ 236 mn = device_unit(self); 237 vdevgone(maj, mn, mn, VCHR); 238 #endif 239 return 0; 240 } 241 242 static int 243 gpio_search(device_t parent, cfdata_t cf, const int *ldesc, void *aux) 244 { 245 struct gpio_attach_args ga; 246 size_t namlen; 247 248 ga.ga_gpio = aux; 249 ga.ga_offset = cf->cf_loc[GPIOCF_OFFSET]; 250 ga.ga_mask = cf->cf_loc[GPIOCF_MASK]; 251 ga.ga_flags = cf->cf_loc[GPIOCF_FLAG]; 252 namlen = strlen(cf->cf_name) + 1; 253 ga.ga_dvname = kmem_alloc(namlen, KM_NOSLEEP); 254 if (ga.ga_dvname == NULL) 255 return 0; 256 strcpy(ga.ga_dvname, cf->cf_name); 257 258 if (config_match(parent, cf, &ga) > 0) 259 config_attach(parent, cf, &ga, gpio_print); 260 kmem_free(ga.ga_dvname, namlen); 261 return 0; 262 } 263 264 int 265 gpio_print(void *aux, const char *pnp) 266 { 267 struct gpio_attach_args *ga = aux; 268 int i; 269 270 printf(" pins"); 271 for (i = 0; i < 32; i++) 272 if (ga->ga_mask & (1 << i)) 273 printf(" %d", ga->ga_offset + i); 274 275 return UNCONF; 276 } 277 278 int 279 gpiobus_print(void *aux, const char *pnp) 280 { 281 #if 0 282 struct gpiobus_attach_args *gba = aux; 283 #endif 284 if (pnp != NULL) 285 aprint_normal("gpiobus at %s", pnp); 286 287 return UNCONF; 288 } 289 290 /* return 1 if all pins can be mapped, 0 if not */ 291 int 292 gpio_pin_can_map(void *gpio, int offset, uint32_t mask) 293 { 294 struct gpio_softc *sc = gpio; 295 int npins, pin, i; 296 297 npins = gpio_npins(mask); 298 if (npins > sc->sc_npins) 299 return 0; 300 301 for (npins = 0, i = 0; i < 32; i++) 302 if (mask & (1 << i)) { 303 pin = offset + i; 304 if (pin < 0 || pin >= sc->sc_npins) 305 return 0; 306 if (sc->sc_pins[pin].pin_mapped) 307 return 0; 308 } 309 310 return 1; 311 } 312 313 int 314 gpio_pin_map(void *gpio, int offset, uint32_t mask, struct gpio_pinmap *map) 315 { 316 struct gpio_softc *sc = gpio; 317 int npins, pin, i; 318 319 npins = gpio_npins(mask); 320 if (npins > sc->sc_npins) 321 return 1; 322 323 for (npins = 0, i = 0; i < 32; i++) 324 if (mask & (1 << i)) { 325 pin = offset + i; 326 if (pin < 0 || pin >= sc->sc_npins) 327 return 1; 328 if (sc->sc_pins[pin].pin_mapped) 329 return 1; 330 sc->sc_pins[pin].pin_mapped = 1; 331 map->pm_map[npins++] = pin; 332 } 333 map->pm_size = npins; 334 335 return 0; 336 } 337 338 void 339 gpio_pin_unmap(void *gpio, struct gpio_pinmap *map) 340 { 341 struct gpio_softc *sc = gpio; 342 int pin, i; 343 344 for (i = 0; i < map->pm_size; i++) { 345 pin = map->pm_map[i]; 346 sc->sc_pins[pin].pin_mapped = 0; 347 } 348 } 349 350 int 351 gpio_pin_read(void *gpio, struct gpio_pinmap *map, int pin) 352 { 353 struct gpio_softc *sc = gpio; 354 355 return gpiobus_pin_read(sc->sc_gc, map->pm_map[pin]); 356 } 357 358 void 359 gpio_pin_write(void *gpio, struct gpio_pinmap *map, int pin, int value) 360 { 361 struct gpio_softc *sc = gpio; 362 363 gpiobus_pin_write(sc->sc_gc, map->pm_map[pin], value); 364 sc->sc_pins[map->pm_map[pin]].pin_state = value; 365 } 366 367 void 368 gpio_pin_ctl(void *gpio, struct gpio_pinmap *map, int pin, int flags) 369 { 370 struct gpio_softc *sc = gpio; 371 372 return gpiobus_pin_ctl(sc->sc_gc, map->pm_map[pin], flags); 373 } 374 375 int 376 gpio_pin_caps(void *gpio, struct gpio_pinmap *map, int pin) 377 { 378 struct gpio_softc *sc = gpio; 379 380 return sc->sc_pins[map->pm_map[pin]].pin_caps; 381 } 382 383 int 384 gpio_npins(uint32_t mask) 385 { 386 int npins, i; 387 388 for (npins = 0, i = 0; i < 32; i++) 389 if (mask & (1 << i)) 390 npins++; 391 392 return npins; 393 } 394 395 int 396 gpio_lock(void *data) 397 { 398 struct gpio_softc *sc; 399 int error; 400 401 error = 0; 402 sc = data; 403 mutex_enter(&sc->sc_mtx); 404 while (sc->sc_ioctl_busy) { 405 error = cv_wait_sig(&sc->sc_ioctl, &sc->sc_mtx); 406 if (error) 407 break; 408 } 409 if (!error) 410 sc->sc_ioctl_busy = 1; 411 mutex_exit(&sc->sc_mtx); 412 return error; 413 } 414 415 void 416 gpio_unlock(void *data) 417 { 418 struct gpio_softc *sc; 419 420 sc = data; 421 mutex_enter(&sc->sc_mtx); 422 sc->sc_ioctl_busy = 0; 423 cv_signal(&sc->sc_ioctl); 424 mutex_exit(&sc->sc_mtx); 425 } 426 427 int 428 gpioopen(dev_t dev, int flag, int mode, struct lwp *l) 429 { 430 struct gpio_softc *sc; 431 432 sc = device_lookup_private(&gpio_cd, minor(dev)); 433 if (sc == NULL) 434 return ENXIO; 435 436 return gpiobus_open(sc->sc_gc, sc->sc_dev); 437 } 438 439 int 440 gpioclose(dev_t dev, int flag, int mode, struct lwp *l) 441 { 442 struct gpio_softc *sc; 443 444 sc = device_lookup_private(&gpio_cd, minor(dev)); 445 return gpiobus_close(sc->sc_gc, sc->sc_dev); 446 } 447 448 static int 449 gpio_pinbyname(struct gpio_softc *sc, char *gp_name) 450 { 451 struct gpio_name *nm; 452 453 LIST_FOREACH(nm, &sc->sc_names, gp_next) 454 if (!strcmp(nm->gp_name, gp_name)) 455 return nm->gp_pin; 456 return -1; 457 } 458 459 int 460 gpioioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 461 { 462 int error; 463 struct gpio_softc *sc; 464 465 sc = device_lookup_private(&gpio_cd, minor(dev)); 466 467 error = gpio_lock(sc); 468 if (error) 469 return error; 470 471 error = gpio_ioctl(sc, cmd, data, flag, l); 472 gpio_unlock(sc); 473 return error; 474 } 475 476 static int 477 gpio_ioctl(struct gpio_softc *sc, u_long cmd, void *data, int flag, 478 struct lwp *l) 479 { 480 gpio_chipset_tag_t gc; 481 struct gpio_info *info; 482 struct gpio_attach *attach; 483 struct gpio_attach_args ga; 484 struct gpio_req *req; 485 struct gpio_name *nm; 486 struct gpio_set *set; 487 #ifdef COMPAT_50 488 struct gpio_dev *gdev; 489 #endif 490 device_t dv; 491 cfdata_t cf; 492 kauth_cred_t cred; 493 int locs[GPIOCF_NLOCS]; 494 int error, pin, value, flags, npins; 495 496 gc = sc->sc_gc; 497 ga.ga_flags = 0; 498 499 if (cmd != GPIOINFO && !device_is_active(sc->sc_dev)) { 500 DPRINTF(("%s: device is not active\n", 501 device_xname(sc->sc_dev))); 502 return EBUSY; 503 } 504 505 cred = kauth_cred_get(); 506 507 switch (cmd) { 508 case GPIOINFO: 509 info = data; 510 if (!kauth_authorize_device(cred, KAUTH_DEVICE_GPIO_PINSET, 511 NULL, NULL, NULL, NULL)) 512 info->gpio_npins = sc->sc_npins; 513 else { 514 for (pin = npins = 0; pin < sc->sc_npins; pin++) 515 if (sc->sc_pins[pin].pin_flags & GPIO_PIN_SET) 516 ++npins; 517 info->gpio_npins = npins; 518 } 519 break; 520 case GPIOREAD: 521 req = data; 522 523 if (req->gp_name[0] != '\0') 524 pin = gpio_pinbyname(sc, req->gp_name); 525 else 526 pin = req->gp_pin; 527 528 if (pin < 0 || pin >= sc->sc_npins) 529 return EINVAL; 530 531 if (!(sc->sc_pins[pin].pin_flags & GPIO_PIN_SET) && 532 kauth_authorize_device(cred, KAUTH_DEVICE_GPIO_PINSET, 533 NULL, NULL, NULL, NULL)) 534 return EPERM; 535 536 /* return read value */ 537 req->gp_value = gpiobus_pin_read(gc, pin); 538 break; 539 case GPIOWRITE: 540 if ((flag & FWRITE) == 0) 541 return EBADF; 542 543 req = data; 544 545 if (req->gp_name[0] != '\0') 546 pin = gpio_pinbyname(sc, req->gp_name); 547 else 548 pin = req->gp_pin; 549 550 if (pin < 0 || pin >= sc->sc_npins) 551 return EINVAL; 552 553 if (sc->sc_pins[pin].pin_mapped) 554 return EBUSY; 555 556 if (!(sc->sc_pins[pin].pin_flags & GPIO_PIN_SET) && 557 kauth_authorize_device(cred, KAUTH_DEVICE_GPIO_PINSET, 558 NULL, NULL, NULL, NULL)) 559 return EPERM; 560 561 value = req->gp_value; 562 if (value != GPIO_PIN_LOW && value != GPIO_PIN_HIGH) 563 return EINVAL; 564 565 gpiobus_pin_write(gc, pin, value); 566 /* return old value */ 567 req->gp_value = sc->sc_pins[pin].pin_state; 568 /* update current value */ 569 sc->sc_pins[pin].pin_state = value; 570 break; 571 case GPIOTOGGLE: 572 if ((flag & FWRITE) == 0) 573 return EBADF; 574 575 req = data; 576 577 if (req->gp_name[0] != '\0') 578 pin = gpio_pinbyname(sc, req->gp_name); 579 else 580 pin = req->gp_pin; 581 582 if (pin < 0 || pin >= sc->sc_npins) 583 return EINVAL; 584 585 if (sc->sc_pins[pin].pin_mapped) 586 return EBUSY; 587 588 if (!(sc->sc_pins[pin].pin_flags & GPIO_PIN_SET) && 589 kauth_authorize_device(cred, KAUTH_DEVICE_GPIO_PINSET, 590 NULL, NULL, NULL, NULL)) 591 return EPERM; 592 593 value = (sc->sc_pins[pin].pin_state == GPIO_PIN_LOW ? 594 GPIO_PIN_HIGH : GPIO_PIN_LOW); 595 gpiobus_pin_write(gc, pin, value); 596 /* return old value */ 597 req->gp_value = sc->sc_pins[pin].pin_state; 598 /* update current value */ 599 sc->sc_pins[pin].pin_state = value; 600 break; 601 case GPIOATTACH: 602 attach = data; 603 ga.ga_flags = attach->ga_flags; 604 #ifdef COMPAT_50 605 /* FALLTHROUGH */ 606 case GPIOATTACH50: 607 /* 608 * The double assignment to 'attach' in case of GPIOATTACH 609 * and COMPAT_50 is on purpose. It ensures backward 610 * compatability in case we are called through the old 611 * GPIOATTACH50 ioctl(2), which had not the ga_flags field 612 * in struct gpio_attach. 613 */ 614 attach = data; 615 #endif 616 if (kauth_authorize_device(cred, KAUTH_DEVICE_GPIO_PINSET, 617 NULL, NULL, NULL, NULL)) 618 return EPERM; 619 620 /* do not try to attach if the pins are already mapped */ 621 if (!gpio_pin_can_map(sc, attach->ga_offset, attach->ga_mask)) 622 return EBUSY; 623 624 error = 0; 625 mutex_enter(&sc->sc_mtx); 626 while (sc->sc_attach_busy) { 627 error = cv_wait_sig(&sc->sc_attach, &sc->sc_mtx); 628 if (error) 629 break; 630 } 631 if (!error) 632 sc->sc_attach_busy = 1; 633 mutex_exit(&sc->sc_mtx); 634 if (error) 635 return EBUSY; 636 637 ga.ga_gpio = sc; 638 /* Don't access attach->ga_flags here. */ 639 ga.ga_dvname = attach->ga_dvname; 640 ga.ga_offset = attach->ga_offset; 641 ga.ga_mask = attach->ga_mask; 642 DPRINTF(("%s: attach %s with offset %d, mask " 643 "0x%02x, and flags 0x%02x\n", device_xname(sc->sc_dev), 644 ga.ga_dvname, ga.ga_offset, ga.ga_mask, ga.ga_flags)); 645 646 locs[GPIOCF_OFFSET] = ga.ga_offset; 647 locs[GPIOCF_MASK] = ga.ga_mask; 648 locs[GPIOCF_FLAG] = ga.ga_flags; 649 650 cf = config_search_loc(NULL, sc->sc_dev, "gpio", locs, &ga); 651 if (cf != NULL) { 652 dv = config_attach_loc(sc->sc_dev, cf, locs, &ga, 653 gpiobus_print); 654 #ifdef COMPAT_50 655 if (dv != NULL) { 656 gdev = kmem_alloc(sizeof(struct gpio_dev), 657 KM_SLEEP); 658 gdev->sc_dev = dv; 659 LIST_INSERT_HEAD(&sc->sc_devs, gdev, sc_next); 660 } else 661 error = EINVAL; 662 #else 663 if (dv == NULL) 664 error = EINVAL; 665 #endif 666 } else 667 error = EINVAL; 668 mutex_enter(&sc->sc_mtx); 669 sc->sc_attach_busy = 0; 670 cv_signal(&sc->sc_attach); 671 mutex_exit(&sc->sc_mtx); 672 return error; 673 case GPIOSET: 674 if (kauth_authorize_device(cred, KAUTH_DEVICE_GPIO_PINSET, 675 NULL, NULL, NULL, NULL)) 676 return EPERM; 677 678 set = data; 679 680 if (set->gp_name[0] != '\0') 681 pin = gpio_pinbyname(sc, set->gp_name); 682 else 683 pin = set->gp_pin; 684 685 if (pin < 0 || pin >= sc->sc_npins) 686 return EINVAL; 687 flags = set->gp_flags; 688 689 /* check that the controller supports all requested flags */ 690 if ((flags & sc->sc_pins[pin].pin_caps) != flags) 691 return ENODEV; 692 flags = set->gp_flags | GPIO_PIN_SET; 693 694 set->gp_caps = sc->sc_pins[pin].pin_caps; 695 /* return old value */ 696 set->gp_flags = sc->sc_pins[pin].pin_flags; 697 if (flags > 0) { 698 gpiobus_pin_ctl(gc, pin, flags); 699 /* update current value */ 700 sc->sc_pins[pin].pin_flags = flags; 701 } 702 703 /* rename pin or new pin? */ 704 if (set->gp_name2[0] != '\0') { 705 struct gpio_name *gnm; 706 707 gnm = NULL; 708 LIST_FOREACH(nm, &sc->sc_names, gp_next) { 709 if (!strcmp(nm->gp_name, set->gp_name2) && 710 nm->gp_pin != pin) 711 return EINVAL; /* duplicate name */ 712 if (nm->gp_pin == pin) 713 gnm = nm; 714 } 715 if (gnm != NULL) 716 strlcpy(gnm->gp_name, set->gp_name2, 717 sizeof(gnm->gp_name)); 718 else { 719 nm = kmem_alloc(sizeof(struct gpio_name), 720 KM_SLEEP); 721 strlcpy(nm->gp_name, set->gp_name2, 722 sizeof(nm->gp_name)); 723 nm->gp_pin = set->gp_pin; 724 LIST_INSERT_HEAD(&sc->sc_names, nm, gp_next); 725 } 726 } 727 break; 728 case GPIOUNSET: 729 if (kauth_authorize_device(cred, KAUTH_DEVICE_GPIO_PINSET, 730 NULL, NULL, NULL, NULL)) 731 return EPERM; 732 733 set = data; 734 if (set->gp_name[0] != '\0') 735 pin = gpio_pinbyname(sc, set->gp_name); 736 else 737 pin = set->gp_pin; 738 739 if (pin < 0 || pin >= sc->sc_npins) 740 return EINVAL; 741 if (sc->sc_pins[pin].pin_mapped) 742 return EBUSY; 743 if (!(sc->sc_pins[pin].pin_flags & GPIO_PIN_SET)) 744 return EINVAL; 745 746 LIST_FOREACH(nm, &sc->sc_names, gp_next) { 747 if (nm->gp_pin == pin) { 748 LIST_REMOVE(nm, gp_next); 749 kmem_free(nm, sizeof(struct gpio_name)); 750 break; 751 } 752 } 753 sc->sc_pins[pin].pin_flags &= ~GPIO_PIN_SET; 754 break; 755 default: 756 #ifdef COMPAT_50 757 /* Try the old API */ 758 DPRINTF(("%s: trying the old API\n", device_xname(sc->sc_dev))); 759 return gpio_ioctl_oapi(sc, cmd, data, flag, cred); 760 #else 761 return ENOTTY; 762 #endif 763 } 764 return 0; 765 } 766 767 #ifdef COMPAT_50 768 static int 769 gpio_ioctl_oapi(struct gpio_softc *sc, u_long cmd, void *data, int flag, 770 kauth_cred_t cred) 771 { 772 gpio_chipset_tag_t gc; 773 struct gpio_pin_op *op; 774 struct gpio_pin_ctl *ctl; 775 struct gpio_attach *attach; 776 struct gpio_dev *gdev; 777 778 int error, pin, value, flags; 779 780 gc = sc->sc_gc; 781 782 switch (cmd) { 783 case GPIOPINREAD: 784 op = data; 785 786 pin = op->gp_pin; 787 788 if (pin < 0 || pin >= sc->sc_npins) 789 return EINVAL; 790 791 if (!(sc->sc_pins[pin].pin_flags & GPIO_PIN_SET) && 792 kauth_authorize_device(cred, KAUTH_DEVICE_GPIO_PINSET, 793 NULL, NULL, NULL, NULL)) 794 return EPERM; 795 796 /* return read value */ 797 op->gp_value = gpiobus_pin_read(gc, pin); 798 break; 799 case GPIOPINWRITE: 800 if ((flag & FWRITE) == 0) 801 return EBADF; 802 803 op = data; 804 805 pin = op->gp_pin; 806 807 if (pin < 0 || pin >= sc->sc_npins) 808 return EINVAL; 809 810 if (sc->sc_pins[pin].pin_mapped) 811 return EBUSY; 812 813 if (!(sc->sc_pins[pin].pin_flags & GPIO_PIN_SET) && 814 kauth_authorize_device(cred, KAUTH_DEVICE_GPIO_PINSET, 815 NULL, NULL, NULL, NULL)) 816 return EPERM; 817 818 value = op->gp_value; 819 if (value != GPIO_PIN_LOW && value != GPIO_PIN_HIGH) 820 return EINVAL; 821 822 gpiobus_pin_write(gc, pin, value); 823 /* return old value */ 824 op->gp_value = sc->sc_pins[pin].pin_state; 825 /* update current value */ 826 sc->sc_pins[pin].pin_state = value; 827 break; 828 case GPIOPINTOGGLE: 829 if ((flag & FWRITE) == 0) 830 return EBADF; 831 832 op = data; 833 834 pin = op->gp_pin; 835 836 if (pin < 0 || pin >= sc->sc_npins) 837 return EINVAL; 838 839 if (sc->sc_pins[pin].pin_mapped) 840 return EBUSY; 841 842 if (!(sc->sc_pins[pin].pin_flags & GPIO_PIN_SET) && 843 kauth_authorize_device(cred, KAUTH_DEVICE_GPIO_PINSET, 844 NULL, NULL, NULL, NULL)) 845 return EPERM; 846 847 value = (sc->sc_pins[pin].pin_state == GPIO_PIN_LOW ? 848 GPIO_PIN_HIGH : GPIO_PIN_LOW); 849 gpiobus_pin_write(gc, pin, value); 850 /* return old value */ 851 op->gp_value = sc->sc_pins[pin].pin_state; 852 /* update current value */ 853 sc->sc_pins[pin].pin_state = value; 854 break; 855 case GPIOPINCTL: 856 ctl = data; 857 858 if (kauth_authorize_device(cred, KAUTH_DEVICE_GPIO_PINSET, 859 NULL, NULL, NULL, NULL)) 860 return EPERM; 861 862 pin = ctl->gp_pin; 863 864 if (pin < 0 || pin >= sc->sc_npins) 865 return EINVAL; 866 if (sc->sc_pins[pin].pin_mapped) 867 return EBUSY; 868 flags = ctl->gp_flags; 869 870 /* check that the controller supports all requested flags */ 871 if ((flags & sc->sc_pins[pin].pin_caps) != flags) 872 return ENODEV; 873 874 ctl->gp_caps = sc->sc_pins[pin].pin_caps; 875 /* return old value */ 876 ctl->gp_flags = sc->sc_pins[pin].pin_flags; 877 if (flags > 0) { 878 gpiobus_pin_ctl(gc, pin, flags); 879 /* update current value */ 880 sc->sc_pins[pin].pin_flags = flags; 881 } 882 break; 883 case GPIODETACH50: 884 /* FALLTHOUGH */ 885 case GPIODETACH: 886 if (kauth_authorize_device(cred, KAUTH_DEVICE_GPIO_PINSET, 887 NULL, NULL, NULL, NULL)) 888 return EPERM; 889 890 error = 0; 891 mutex_enter(&sc->sc_mtx); 892 while (sc->sc_attach_busy) { 893 error = cv_wait_sig(&sc->sc_attach, &sc->sc_mtx); 894 if (error) 895 break; 896 } 897 if (!error) 898 sc->sc_attach_busy = 1; 899 mutex_exit(&sc->sc_mtx); 900 if (error) 901 return EBUSY; 902 903 attach = data; 904 LIST_FOREACH(gdev, &sc->sc_devs, sc_next) { 905 if (strcmp(device_xname(gdev->sc_dev), 906 attach->ga_dvname) == 0) { 907 mutex_enter(&sc->sc_mtx); 908 sc->sc_attach_busy = 0; 909 cv_signal(&sc->sc_attach); 910 mutex_exit(&sc->sc_mtx); 911 912 if (config_detach(gdev->sc_dev, 0) == 0) 913 return 0; 914 break; 915 } 916 } 917 if (gdev == NULL) { 918 mutex_enter(&sc->sc_mtx); 919 sc->sc_attach_busy = 0; 920 cv_signal(&sc->sc_attach); 921 mutex_exit(&sc->sc_mtx); 922 } 923 return EINVAL; 924 925 default: 926 return ENOTTY; 927 } 928 return 0; 929 } 930 #endif /* COMPAT_50 */ 931 932 MODULE(MODULE_CLASS_DRIVER, gpio, NULL); 933 934 #ifdef _MODULE 935 #include "ioconf.c" 936 #endif 937 938 static int 939 gpio_modcmd(modcmd_t cmd, void *opaque) 940 { 941 #ifdef _MODULE 942 devmajor_t cmajor = NODEVMAJOR, bmajor = NODEVMAJOR; 943 int error; 944 #endif 945 switch (cmd) { 946 case MODULE_CMD_INIT: 947 #ifdef _MODULE 948 error = config_init_component(cfdriver_ioconf_gpio, 949 cfattach_ioconf_gpio, cfdata_ioconf_gpio); 950 if (error) { 951 aprint_error("%s: unable to init component\n", 952 gpio_cd.cd_name); 953 return error; 954 } 955 error = devsw_attach(gpio_cd.cd_name, NULL, &bmajor, 956 &gpio_cdevsw, &cmajor); 957 if (error) { 958 aprint_error("%s: unable to register devsw\n", 959 gpio_cd.cd_name); 960 return config_fini_component(cfdriver_ioconf_gpio, 961 cfattach_ioconf_gpio, cfdata_ioconf_gpio); 962 } 963 #endif 964 return 0; 965 case MODULE_CMD_FINI: 966 #ifdef _MODULE 967 config_fini_component(cfdriver_ioconf_gpio, 968 cfattach_ioconf_gpio, cfdata_ioconf_gpio); 969 devsw_detach(NULL, &gpio_cdevsw); 970 #endif 971 return 0; 972 default: 973 return ENOTTY; 974 } 975 } 976
Indexes created Mon Sep 22 21:09:42 GMT 2025