| 1 | /* $NetBSD: gpio.c,v 1.58 2016/05/11 18:33:40 bouyer 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@msys.ch> |
| 6 | * Copyright (c) 2004, 2006 Alexander Yurchenko <grange@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 1.58 2016/05/11 18:33:40 bouyer 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 | .d_open = gpioopen, |
| 104 | .d_close = gpioclose, |
| 105 | .d_read = noread, |
| 106 | .d_write = nowrite, |
| 107 | .d_ioctl = gpioioctl, |
| 108 | .d_stop = nostop, |
| 109 | .d_tty = notty, |
| 110 | .d_poll = nopoll, |
| 111 | .d_mmap = nommap, |
| 112 | .d_kqfilter = nokqfilter, |
| 113 | .d_discard = nodiscard, |
| 114 | .d_flag = D_OTHER | D_MPSAFE |
| 115 | }; |
| 116 | |
| 117 | extern struct cfdriver gpio_cd; |
| 118 | |
| 119 | static int |
| 120 | gpio_match(device_t parent, cfdata_t cf, void *aux) |
| 121 | { |
| 122 | return 1; |
| 123 | } |
| 124 | |
| 125 | int |
| 126 | gpio_submatch(device_t parent, cfdata_t cf, const int *ip, void *aux) |
| 127 | { |
| 128 | struct gpio_attach_args *ga = aux; |
| 129 | |
| 130 | if (ga->ga_offset == -1) |
| 131 | return 0; |
| 132 | |
| 133 | return strcmp(ga->ga_dvname, cf->cf_name) == 0; |
| 134 | } |
| 135 | |
| 136 | static bool |
| 137 | gpio_resume(device_t self, const pmf_qual_t *qual) |
| 138 | { |
| 139 | struct gpio_softc *sc = device_private(self); |
| 140 | int pin; |
| 141 | |
| 142 | for (pin = 0; pin < sc->sc_npins; pin++) { |
| 143 | gpiobus_pin_ctl(sc->sc_gc, pin, sc->sc_pins[pin].pin_flags); |
| 144 | gpiobus_pin_write(sc->sc_gc, pin, sc->sc_pins[pin].pin_state); |
| 145 | } |
| 146 | return true; |
| 147 | } |
| 148 | |
| 149 | static void |
| 150 | gpio_childdetached(device_t self, device_t child) |
| 151 | { |
| 152 | #ifdef COMPAT_50 |
| 153 | struct gpio_dev *gdev; |
| 154 | struct gpio_softc *sc; |
| 155 | int error; |
| 156 | |
| 157 | /* |
| 158 | * gpio_childetached is serialized because it can be entered in |
| 159 | * different ways concurrently, e.g. via the GPIODETACH ioctl and |
| 160 | * drvctl(8) or modunload(8). |
| 161 | */ |
| 162 | sc = device_private(self); |
| 163 | error = 0; |
| 164 | mutex_enter(&sc->sc_mtx); |
| 165 | while (sc->sc_attach_busy) { |
| 166 | error = cv_wait_sig(&sc->sc_attach, &sc->sc_mtx); |
| 167 | if (error) |
| 168 | break; |
| 169 | } |
| 170 | if (!error) |
| 171 | sc->sc_attach_busy = 1; |
| 172 | mutex_exit(&sc->sc_mtx); |
| 173 | if (error) |
| 174 | return; |
| 175 | |
| 176 | LIST_FOREACH(gdev, &sc->sc_devs, sc_next) |
| 177 | if (gdev->sc_dev == child) { |
| 178 | LIST_REMOVE(gdev, sc_next); |
| 179 | kmem_free(gdev, sizeof(struct gpio_dev)); |
| 180 | break; |
| 181 | } |
| 182 | |
| 183 | mutex_enter(&sc->sc_mtx); |
| 184 | sc->sc_attach_busy = 0; |
| 185 | cv_signal(&sc->sc_attach); |
| 186 | mutex_exit(&sc->sc_mtx); |
| 187 | #endif |
| 188 | } |
| 189 | |
| 190 | static int |
| 191 | gpio_rescan(device_t self, const char *ifattr, const int *locators) |
| 192 | { |
| 193 | struct gpio_softc *sc = device_private(self); |
| 194 | |
| 195 | config_search_loc(gpio_search, self, ifattr, locators, sc); |
| 196 | |
| 197 | return 0; |
| 198 | } |
| 199 | |
| 200 | static void |
| 201 | gpio_attach(device_t parent, device_t self, void *aux) |
| 202 | { |
| 203 | struct gpio_softc *sc = device_private(self); |
| 204 | struct gpiobus_attach_args *gba = aux; |
| 205 | |
| 206 | sc->sc_dev = self; |
| 207 | sc->sc_gc = gba->gba_gc; |
| 208 | sc->sc_pins = gba->gba_pins; |
| 209 | sc->sc_npins = gba->gba_npins; |
| 210 | |
| 211 | aprint_normal(": %d pins\n" , sc->sc_npins); |
| 212 | aprint_naive("\n" ); |
| 213 | |
| 214 | if (!pmf_device_register(self, NULL, gpio_resume)) |
| 215 | aprint_error_dev(self, "couldn't establish power handler\n" ); |
| 216 | mutex_init(&sc->sc_mtx, MUTEX_DEFAULT, IPL_VM); |
| 217 | cv_init(&sc->sc_ioctl, "gpioctl" ); |
| 218 | cv_init(&sc->sc_attach, "gpioatch" ); |
| 219 | /* |
| 220 | * Attach all devices that can be connected to the GPIO pins |
| 221 | * described in the kernel configuration file. |
| 222 | */ |
| 223 | gpio_rescan(self, "gpio" , NULL); |
| 224 | } |
| 225 | |
| 226 | static int |
| 227 | gpio_detach(device_t self, int flags) |
| 228 | { |
| 229 | struct gpio_softc *sc; |
| 230 | int rc; |
| 231 | |
| 232 | sc = device_private(self); |
| 233 | |
| 234 | if ((rc = config_detach_children(self, flags)) != 0) |
| 235 | return rc; |
| 236 | mutex_destroy(&sc->sc_mtx); |
| 237 | cv_destroy(&sc->sc_ioctl); |
| 238 | #if 0 |
| 239 | int maj, mn; |
| 240 | |
| 241 | /* Locate the major number */ |
| 242 | for (maj = 0; maj < nchrdev; maj++) |
| 243 | if (cdevsw[maj].d_open == gpioopen) |
| 244 | break; |
| 245 | |
| 246 | /* Nuke the vnodes for any open instances (calls close) */ |
| 247 | mn = device_unit(self); |
| 248 | vdevgone(maj, mn, mn, VCHR); |
| 249 | #endif |
| 250 | return 0; |
| 251 | } |
| 252 | |
| 253 | static int |
| 254 | gpio_search(device_t parent, cfdata_t cf, const int *ldesc, void *aux) |
| 255 | { |
| 256 | struct gpio_attach_args ga; |
| 257 | size_t namlen; |
| 258 | |
| 259 | ga.ga_gpio = aux; |
| 260 | ga.ga_offset = cf->cf_loc[GPIOCF_OFFSET]; |
| 261 | ga.ga_mask = cf->cf_loc[GPIOCF_MASK]; |
| 262 | ga.ga_flags = cf->cf_loc[GPIOCF_FLAG]; |
| 263 | namlen = strlen(cf->cf_name) + 1; |
| 264 | ga.ga_dvname = kmem_alloc(namlen, KM_NOSLEEP); |
| 265 | if (ga.ga_dvname == NULL) |
| 266 | return 0; |
| 267 | strcpy(ga.ga_dvname, cf->cf_name); |
| 268 | |
| 269 | if (config_match(parent, cf, &ga) > 0) |
| 270 | config_attach(parent, cf, &ga, gpio_print); |
| 271 | kmem_free(ga.ga_dvname, namlen); |
| 272 | return 0; |
| 273 | } |
| 274 | |
| 275 | int |
| 276 | gpio_print(void *aux, const char *pnp) |
| 277 | { |
| 278 | struct gpio_attach_args *ga = aux; |
| 279 | int i; |
| 280 | |
| 281 | aprint_normal(" pins" ); |
| 282 | for (i = 0; i < 32; i++) |
| 283 | if (ga->ga_mask & (1 << i)) |
| 284 | aprint_normal(" %d" , ga->ga_offset + i); |
| 285 | |
| 286 | return UNCONF; |
| 287 | } |
| 288 | |
| 289 | int |
| 290 | gpiobus_print(void *aux, const char *pnp) |
| 291 | { |
| 292 | #if 0 |
| 293 | struct gpiobus_attach_args *gba = aux; |
| 294 | #endif |
| 295 | if (pnp != NULL) |
| 296 | aprint_normal("gpiobus at %s" , pnp); |
| 297 | |
| 298 | return UNCONF; |
| 299 | } |
| 300 | |
| 301 | /* called from backends when a interrupt even occurs */ |
| 302 | void |
| 303 | gpio_intr(device_t self, uint32_t evts) |
| 304 | { |
| 305 | struct gpio_softc *sc = device_private(self); |
| 306 | void (*callback)(void *); |
| 307 | void *callback_arg; |
| 308 | |
| 309 | for (int i = 0; i < sc->sc_npins; i++) { |
| 310 | if (evts & (1 << i)) { |
| 311 | mutex_enter(&sc->sc_mtx); |
| 312 | callback = sc->sc_pins[i].pin_callback; |
| 313 | callback_arg = sc->sc_pins[i].pin_callback_arg; |
| 314 | DPRINTFN(2, ("gpio pin %d event callback %p\n" , i, callback)); |
| 315 | if (callback != NULL) { |
| 316 | callback(callback_arg); |
| 317 | } |
| 318 | mutex_exit(&sc->sc_mtx); |
| 319 | } |
| 320 | } |
| 321 | } |
| 322 | |
| 323 | void * |
| 324 | gpio_find_device(const char *name) |
| 325 | { |
| 326 | device_t gpio_dev; |
| 327 | gpio_dev = device_find_by_xname(name); |
| 328 | if (gpio_dev == NULL) |
| 329 | return NULL; |
| 330 | return device_private(gpio_dev); |
| 331 | } |
| 332 | |
| 333 | const char * |
| 334 | gpio_get_name(void *gpio) |
| 335 | { |
| 336 | struct gpio_softc *sc = gpio; |
| 337 | return device_xname(sc->sc_dev); |
| 338 | } |
| 339 | |
| 340 | /* return 1 if all pins can be mapped, 0 if not */ |
| 341 | int |
| 342 | gpio_pin_can_map(void *gpio, int offset, uint32_t mask) |
| 343 | { |
| 344 | struct gpio_softc *sc = gpio; |
| 345 | int npins, pin, i; |
| 346 | |
| 347 | npins = gpio_npins(mask); |
| 348 | if (npins > sc->sc_npins) |
| 349 | return 0; |
| 350 | |
| 351 | for (npins = 0, i = 0; i < 32; i++) |
| 352 | if (mask & (1 << i)) { |
| 353 | pin = offset + i; |
| 354 | if (pin < 0 || pin >= sc->sc_npins) |
| 355 | return 0; |
| 356 | if (sc->sc_pins[pin].pin_mapped) |
| 357 | return 0; |
| 358 | } |
| 359 | |
| 360 | return 1; |
| 361 | } |
| 362 | |
| 363 | int |
| 364 | gpio_pin_map(void *gpio, int offset, uint32_t mask, struct gpio_pinmap *map) |
| 365 | { |
| 366 | struct gpio_softc *sc = gpio; |
| 367 | int npins, pin, i; |
| 368 | |
| 369 | npins = gpio_npins(mask); |
| 370 | if (npins > sc->sc_npins) |
| 371 | return 1; |
| 372 | |
| 373 | for (npins = 0, i = 0; i < 32; i++) |
| 374 | if (mask & (1 << i)) { |
| 375 | pin = offset + i; |
| 376 | if (pin < 0 || pin >= sc->sc_npins) |
| 377 | return 1; |
| 378 | if (sc->sc_pins[pin].pin_mapped) |
| 379 | return 1; |
| 380 | sc->sc_pins[pin].pin_mapped = 1; |
| 381 | map->pm_map[npins++] = pin; |
| 382 | } |
| 383 | map->pm_size = npins; |
| 384 | |
| 385 | return 0; |
| 386 | } |
| 387 | |
| 388 | void |
| 389 | gpio_pin_unmap(void *gpio, struct gpio_pinmap *map) |
| 390 | { |
| 391 | struct gpio_softc *sc = gpio; |
| 392 | int pin, i; |
| 393 | |
| 394 | for (i = 0; i < map->pm_size; i++) { |
| 395 | pin = map->pm_map[i]; |
| 396 | sc->sc_pins[pin].pin_mapped = 0; |
| 397 | } |
| 398 | } |
| 399 | |
| 400 | int |
| 401 | gpio_pin_read(void *gpio, struct gpio_pinmap *map, int pin) |
| 402 | { |
| 403 | struct gpio_softc *sc = gpio; |
| 404 | |
| 405 | return gpiobus_pin_read(sc->sc_gc, map->pm_map[pin]); |
| 406 | } |
| 407 | |
| 408 | void |
| 409 | gpio_pin_write(void *gpio, struct gpio_pinmap *map, int pin, int value) |
| 410 | { |
| 411 | struct gpio_softc *sc = gpio; |
| 412 | |
| 413 | gpiobus_pin_write(sc->sc_gc, map->pm_map[pin], value); |
| 414 | sc->sc_pins[map->pm_map[pin]].pin_state = value; |
| 415 | } |
| 416 | |
| 417 | void |
| 418 | gpio_pin_ctl(void *gpio, struct gpio_pinmap *map, int pin, int flags) |
| 419 | { |
| 420 | struct gpio_softc *sc = gpio; |
| 421 | struct gpio_pin *pinp = &sc->sc_pins[map->pm_map[pin]]; |
| 422 | |
| 423 | KASSERT((flags & GPIO_PIN_EVENTS) == 0); |
| 424 | mutex_enter(&sc->sc_mtx); |
| 425 | gpiobus_pin_ctl(sc->sc_gc, map->pm_map[pin], flags); |
| 426 | pinp->pin_callback = NULL; |
| 427 | pinp->pin_callback_arg = NULL; |
| 428 | mutex_exit(&sc->sc_mtx); |
| 429 | } |
| 430 | |
| 431 | int |
| 432 | gpio_pin_ctl_intr(void *gpio, struct gpio_pinmap *map, int pin, int flags, |
| 433 | int ipl, void (*callback)(void *), void *arg) |
| 434 | { |
| 435 | struct gpio_softc *sc = gpio; |
| 436 | struct gpio_pin *pinp = &sc->sc_pins[map->pm_map[pin]]; |
| 437 | KASSERT((flags & GPIO_PIN_EVENTS) != 0); |
| 438 | if (ipl != IPL_VM) |
| 439 | return EINVAL; |
| 440 | mutex_enter(&sc->sc_mtx); |
| 441 | if (pinp->pin_callback != NULL) { |
| 442 | mutex_exit(&sc->sc_mtx); |
| 443 | return EEXIST; |
| 444 | } |
| 445 | pinp->pin_callback = callback; |
| 446 | pinp->pin_callback_arg = arg; |
| 447 | gpiobus_pin_ctl(sc->sc_gc, map->pm_map[pin], flags); |
| 448 | mutex_exit(&sc->sc_mtx); |
| 449 | return 0; |
| 450 | } |
| 451 | |
| 452 | void |
| 453 | gpio_pin_irqen(void *gpio, struct gpio_pinmap *map, int pin, bool en) |
| 454 | { |
| 455 | struct gpio_softc *sc = gpio; |
| 456 | gpiobus_pin_irqen(sc->sc_gc, map->pm_map[pin], en); |
| 457 | } |
| 458 | |
| 459 | int |
| 460 | gpio_pin_caps(void *gpio, struct gpio_pinmap *map, int pin) |
| 461 | { |
| 462 | struct gpio_softc *sc = gpio; |
| 463 | |
| 464 | return sc->sc_pins[map->pm_map[pin]].pin_caps; |
| 465 | } |
| 466 | |
| 467 | int |
| 468 | gpio_npins(uint32_t mask) |
| 469 | { |
| 470 | int npins, i; |
| 471 | |
| 472 | for (npins = 0, i = 0; i < 32; i++) |
| 473 | if (mask & (1 << i)) |
| 474 | npins++; |
| 475 | |
| 476 | return npins; |
| 477 | } |
| 478 | |
| 479 | int |
| 480 | gpio_lock(void *data) |
| 481 | { |
| 482 | struct gpio_softc *sc; |
| 483 | int error; |
| 484 | |
| 485 | error = 0; |
| 486 | sc = data; |
| 487 | mutex_enter(&sc->sc_mtx); |
| 488 | while (sc->sc_ioctl_busy) { |
| 489 | error = cv_wait_sig(&sc->sc_ioctl, &sc->sc_mtx); |
| 490 | if (error) |
| 491 | break; |
| 492 | } |
| 493 | if (!error) |
| 494 | sc->sc_ioctl_busy = 1; |
| 495 | mutex_exit(&sc->sc_mtx); |
| 496 | return error; |
| 497 | } |
| 498 | |
| 499 | void |
| 500 | gpio_unlock(void *data) |
| 501 | { |
| 502 | struct gpio_softc *sc; |
| 503 | |
| 504 | sc = data; |
| 505 | mutex_enter(&sc->sc_mtx); |
| 506 | sc->sc_ioctl_busy = 0; |
| 507 | cv_signal(&sc->sc_ioctl); |
| 508 | mutex_exit(&sc->sc_mtx); |
| 509 | } |
| 510 | |
| 511 | int |
| 512 | gpioopen(dev_t dev, int flag, int mode, struct lwp *l) |
| 513 | { |
| 514 | struct gpio_softc *sc; |
| 515 | |
| 516 | sc = device_lookup_private(&gpio_cd, minor(dev)); |
| 517 | if (sc == NULL) |
| 518 | return ENXIO; |
| 519 | |
| 520 | return gpiobus_open(sc->sc_gc, sc->sc_dev); |
| 521 | } |
| 522 | |
| 523 | int |
| 524 | gpioclose(dev_t dev, int flag, int mode, struct lwp *l) |
| 525 | { |
| 526 | struct gpio_softc *sc; |
| 527 | |
| 528 | sc = device_lookup_private(&gpio_cd, minor(dev)); |
| 529 | return gpiobus_close(sc->sc_gc, sc->sc_dev); |
| 530 | } |
| 531 | |
| 532 | static int |
| 533 | gpio_pinbyname(struct gpio_softc *sc, char *gp_name) |
| 534 | { |
| 535 | struct gpio_name *nm; |
| 536 | |
| 537 | LIST_FOREACH(nm, &sc->sc_names, gp_next) |
| 538 | if (!strcmp(nm->gp_name, gp_name)) |
| 539 | return nm->gp_pin; |
| 540 | return -1; |
| 541 | } |
| 542 | |
| 543 | int |
| 544 | gpioioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) |
| 545 | { |
| 546 | int error; |
| 547 | struct gpio_softc *sc; |
| 548 | |
| 549 | sc = device_lookup_private(&gpio_cd, minor(dev)); |
| 550 | |
| 551 | error = gpio_lock(sc); |
| 552 | if (error) |
| 553 | return error; |
| 554 | |
| 555 | error = gpio_ioctl(sc, cmd, data, flag, l); |
| 556 | gpio_unlock(sc); |
| 557 | return error; |
| 558 | } |
| 559 | |
| 560 | static int |
| 561 | gpio_ioctl(struct gpio_softc *sc, u_long cmd, void *data, int flag, |
| 562 | struct lwp *l) |
| 563 | { |
| 564 | gpio_chipset_tag_t gc; |
| 565 | struct gpio_info *info; |
| 566 | struct gpio_attach *attach; |
| 567 | struct gpio_attach_args ga; |
| 568 | struct gpio_req *req; |
| 569 | struct gpio_name *nm; |
| 570 | struct gpio_set *set; |
| 571 | #ifdef COMPAT_50 |
| 572 | struct gpio_dev *gdev; |
| 573 | #endif |
| 574 | device_t dv; |
| 575 | cfdata_t cf; |
| 576 | kauth_cred_t cred; |
| 577 | int locs[GPIOCF_NLOCS]; |
| 578 | int error, pin, value, flags, npins; |
| 579 | |
| 580 | gc = sc->sc_gc; |
| 581 | ga.ga_flags = 0; |
| 582 | |
| 583 | if (cmd != GPIOINFO && !device_is_active(sc->sc_dev)) { |
| 584 | DPRINTF(("%s: device is not active\n" , |
| 585 | device_xname(sc->sc_dev))); |
| 586 | return EBUSY; |
| 587 | } |
| 588 | |
| 589 | cred = kauth_cred_get(); |
| 590 | |
| 591 | switch (cmd) { |
| 592 | case GPIOINFO: |
| 593 | info = data; |
| 594 | if (!kauth_authorize_device(cred, KAUTH_DEVICE_GPIO_PINSET, |
| 595 | NULL, NULL, NULL, NULL)) |
| 596 | info->gpio_npins = sc->sc_npins; |
| 597 | else { |
| 598 | for (pin = npins = 0; pin < sc->sc_npins; pin++) |
| 599 | if (sc->sc_pins[pin].pin_flags & GPIO_PIN_SET) |
| 600 | ++npins; |
| 601 | info->gpio_npins = npins; |
| 602 | } |
| 603 | break; |
| 604 | case GPIOREAD: |
| 605 | req = data; |
| 606 | |
| 607 | if (req->gp_name[0] != '\0') |
| 608 | pin = gpio_pinbyname(sc, req->gp_name); |
| 609 | else |
| 610 | pin = req->gp_pin; |
| 611 | |
| 612 | if (pin < 0 || pin >= sc->sc_npins) |
| 613 | return EINVAL; |
| 614 | |
| 615 | if (!(sc->sc_pins[pin].pin_flags & GPIO_PIN_SET) && |
| 616 | kauth_authorize_device(cred, KAUTH_DEVICE_GPIO_PINSET, |
| 617 | NULL, NULL, NULL, NULL)) |
| 618 | return EPERM; |
| 619 | |
| 620 | /* return read value */ |
| 621 | req->gp_value = gpiobus_pin_read(gc, pin); |
| 622 | break; |
| 623 | case GPIOWRITE: |
| 624 | if ((flag & FWRITE) == 0) |
| 625 | return EBADF; |
| 626 | |
| 627 | req = data; |
| 628 | |
| 629 | if (req->gp_name[0] != '\0') |
| 630 | pin = gpio_pinbyname(sc, req->gp_name); |
| 631 | else |
| 632 | pin = req->gp_pin; |
| 633 | |
| 634 | if (pin < 0 || pin >= sc->sc_npins) |
| 635 | return EINVAL; |
| 636 | |
| 637 | if (sc->sc_pins[pin].pin_mapped) |
| 638 | return EBUSY; |
| 639 | |
| 640 | if (!(sc->sc_pins[pin].pin_flags & GPIO_PIN_SET) && |
| 641 | kauth_authorize_device(cred, KAUTH_DEVICE_GPIO_PINSET, |
| 642 | NULL, NULL, NULL, NULL)) |
| 643 | return EPERM; |
| 644 | |
| 645 | value = req->gp_value; |
| 646 | if (value != GPIO_PIN_LOW && value != GPIO_PIN_HIGH) |
| 647 | return EINVAL; |
| 648 | |
| 649 | /* return old value */ |
| 650 | req->gp_value = gpiobus_pin_read(gc, pin); |
| 651 | gpiobus_pin_write(gc, pin, value); |
| 652 | /* update current value */ |
| 653 | sc->sc_pins[pin].pin_state = value; |
| 654 | break; |
| 655 | case GPIOTOGGLE: |
| 656 | if ((flag & FWRITE) == 0) |
| 657 | return EBADF; |
| 658 | |
| 659 | req = data; |
| 660 | |
| 661 | if (req->gp_name[0] != '\0') |
| 662 | pin = gpio_pinbyname(sc, req->gp_name); |
| 663 | else |
| 664 | pin = req->gp_pin; |
| 665 | |
| 666 | if (pin < 0 || pin >= sc->sc_npins) |
| 667 | return EINVAL; |
| 668 | |
| 669 | if (sc->sc_pins[pin].pin_mapped) |
| 670 | return EBUSY; |
| 671 | |
| 672 | if (!(sc->sc_pins[pin].pin_flags & GPIO_PIN_SET) && |
| 673 | kauth_authorize_device(cred, KAUTH_DEVICE_GPIO_PINSET, |
| 674 | NULL, NULL, NULL, NULL)) |
| 675 | return EPERM; |
| 676 | |
| 677 | value = (sc->sc_pins[pin].pin_state == GPIO_PIN_LOW ? |
| 678 | GPIO_PIN_HIGH : GPIO_PIN_LOW); |
| 679 | gpiobus_pin_write(gc, pin, value); |
| 680 | /* return old value */ |
| 681 | req->gp_value = sc->sc_pins[pin].pin_state; |
| 682 | /* update current value */ |
| 683 | sc->sc_pins[pin].pin_state = value; |
| 684 | break; |
| 685 | case GPIOATTACH: |
| 686 | attach = data; |
| 687 | ga.ga_flags = attach->ga_flags; |
| 688 | #ifdef COMPAT_50 |
| 689 | /* FALLTHROUGH */ |
| 690 | case GPIOATTACH50: |
| 691 | /* |
| 692 | * The double assignment to 'attach' in case of GPIOATTACH |
| 693 | * and COMPAT_50 is on purpose. It ensures backward |
| 694 | * compatability in case we are called through the old |
| 695 | * GPIOATTACH50 ioctl(2), which had not the ga_flags field |
| 696 | * in struct gpio_attach. |
| 697 | */ |
| 698 | attach = data; |
| 699 | #endif |
| 700 | if (kauth_authorize_device(cred, KAUTH_DEVICE_GPIO_PINSET, |
| 701 | NULL, NULL, NULL, NULL)) |
| 702 | return EPERM; |
| 703 | |
| 704 | /* do not try to attach if the pins are already mapped */ |
| 705 | if (!gpio_pin_can_map(sc, attach->ga_offset, attach->ga_mask)) |
| 706 | return EBUSY; |
| 707 | |
| 708 | error = 0; |
| 709 | mutex_enter(&sc->sc_mtx); |
| 710 | while (sc->sc_attach_busy) { |
| 711 | error = cv_wait_sig(&sc->sc_attach, &sc->sc_mtx); |
| 712 | if (error) |
| 713 | break; |
| 714 | } |
| 715 | if (!error) |
| 716 | sc->sc_attach_busy = 1; |
| 717 | mutex_exit(&sc->sc_mtx); |
| 718 | if (error) |
| 719 | return EBUSY; |
| 720 | |
| 721 | ga.ga_gpio = sc; |
| 722 | /* Don't access attach->ga_flags here. */ |
| 723 | ga.ga_dvname = attach->ga_dvname; |
| 724 | ga.ga_offset = attach->ga_offset; |
| 725 | ga.ga_mask = attach->ga_mask; |
| 726 | DPRINTF(("%s: attach %s with offset %d, mask " |
| 727 | "0x%02x, and flags 0x%02x\n" , device_xname(sc->sc_dev), |
| 728 | ga.ga_dvname, ga.ga_offset, ga.ga_mask, ga.ga_flags)); |
| 729 | |
| 730 | locs[GPIOCF_OFFSET] = ga.ga_offset; |
| 731 | locs[GPIOCF_MASK] = ga.ga_mask; |
| 732 | locs[GPIOCF_FLAG] = ga.ga_flags; |
| 733 | |
| 734 | cf = config_search_loc(NULL, sc->sc_dev, "gpio" , locs, &ga); |
| 735 | if (cf != NULL) { |
| 736 | dv = config_attach_loc(sc->sc_dev, cf, locs, &ga, |
| 737 | gpiobus_print); |
| 738 | #ifdef COMPAT_50 |
| 739 | if (dv != NULL) { |
| 740 | gdev = kmem_alloc(sizeof(struct gpio_dev), |
| 741 | KM_SLEEP); |
| 742 | gdev->sc_dev = dv; |
| 743 | LIST_INSERT_HEAD(&sc->sc_devs, gdev, sc_next); |
| 744 | } else |
| 745 | error = EINVAL; |
| 746 | #else |
| 747 | if (dv == NULL) |
| 748 | error = EINVAL; |
| 749 | #endif |
| 750 | } else |
| 751 | error = EINVAL; |
| 752 | mutex_enter(&sc->sc_mtx); |
| 753 | sc->sc_attach_busy = 0; |
| 754 | cv_signal(&sc->sc_attach); |
| 755 | mutex_exit(&sc->sc_mtx); |
| 756 | return error; |
| 757 | case GPIOSET: |
| 758 | if (kauth_authorize_device(cred, KAUTH_DEVICE_GPIO_PINSET, |
| 759 | NULL, NULL, NULL, NULL)) |
| 760 | return EPERM; |
| 761 | |
| 762 | set = data; |
| 763 | |
| 764 | if (set->gp_name[0] != '\0') |
| 765 | pin = gpio_pinbyname(sc, set->gp_name); |
| 766 | else |
| 767 | pin = set->gp_pin; |
| 768 | |
| 769 | if (pin < 0 || pin >= sc->sc_npins) |
| 770 | return EINVAL; |
| 771 | flags = set->gp_flags; |
| 772 | |
| 773 | /* check that the controller supports all requested flags */ |
| 774 | if ((flags & sc->sc_pins[pin].pin_caps) != flags) |
| 775 | return ENODEV; |
| 776 | flags = set->gp_flags; |
| 777 | |
| 778 | set->gp_caps = sc->sc_pins[pin].pin_caps; |
| 779 | /* return old value */ |
| 780 | set->gp_flags = sc->sc_pins[pin].pin_flags; |
| 781 | |
| 782 | if (flags > 0) { |
| 783 | flags |= GPIO_PIN_SET; |
| 784 | gpiobus_pin_ctl(gc, pin, flags); |
| 785 | /* update current value */ |
| 786 | sc->sc_pins[pin].pin_flags = flags; |
| 787 | } |
| 788 | |
| 789 | /* rename pin or new pin? */ |
| 790 | if (set->gp_name2[0] != '\0') { |
| 791 | struct gpio_name *gnm; |
| 792 | |
| 793 | gnm = NULL; |
| 794 | LIST_FOREACH(nm, &sc->sc_names, gp_next) { |
| 795 | if (!strcmp(nm->gp_name, set->gp_name2) && |
| 796 | nm->gp_pin != pin) |
| 797 | return EINVAL; /* duplicate name */ |
| 798 | if (nm->gp_pin == pin) |
| 799 | gnm = nm; |
| 800 | } |
| 801 | if (gnm != NULL) |
| 802 | strlcpy(gnm->gp_name, set->gp_name2, |
| 803 | sizeof(gnm->gp_name)); |
| 804 | else { |
| 805 | nm = kmem_alloc(sizeof(struct gpio_name), |
| 806 | KM_SLEEP); |
| 807 | strlcpy(nm->gp_name, set->gp_name2, |
| 808 | sizeof(nm->gp_name)); |
| 809 | nm->gp_pin = set->gp_pin; |
| 810 | LIST_INSERT_HEAD(&sc->sc_names, nm, gp_next); |
| 811 | } |
| 812 | } |
| 813 | break; |
| 814 | case GPIOUNSET: |
| 815 | if (kauth_authorize_device(cred, KAUTH_DEVICE_GPIO_PINSET, |
| 816 | NULL, NULL, NULL, NULL)) |
| 817 | return EPERM; |
| 818 | |
| 819 | set = data; |
| 820 | if (set->gp_name[0] != '\0') |
| 821 | pin = gpio_pinbyname(sc, set->gp_name); |
| 822 | else |
| 823 | pin = set->gp_pin; |
| 824 | |
| 825 | if (pin < 0 || pin >= sc->sc_npins) |
| 826 | return EINVAL; |
| 827 | if (sc->sc_pins[pin].pin_mapped) |
| 828 | return EBUSY; |
| 829 | if (!(sc->sc_pins[pin].pin_flags & GPIO_PIN_SET)) |
| 830 | return EINVAL; |
| 831 | |
| 832 | LIST_FOREACH(nm, &sc->sc_names, gp_next) { |
| 833 | if (nm->gp_pin == pin) { |
| 834 | LIST_REMOVE(nm, gp_next); |
| 835 | kmem_free(nm, sizeof(struct gpio_name)); |
| 836 | break; |
| 837 | } |
| 838 | } |
| 839 | sc->sc_pins[pin].pin_flags &= ~GPIO_PIN_SET; |
| 840 | break; |
| 841 | default: |
| 842 | #ifdef COMPAT_50 |
| 843 | /* Try the old API */ |
| 844 | DPRINTF(("%s: trying the old API\n" , device_xname(sc->sc_dev))); |
| 845 | return gpio_ioctl_oapi(sc, cmd, data, flag, cred); |
| 846 | #else |
| 847 | return ENOTTY; |
| 848 | #endif |
| 849 | } |
| 850 | return 0; |
| 851 | } |
| 852 | |
| 853 | #ifdef COMPAT_50 |
| 854 | static int |
| 855 | gpio_ioctl_oapi(struct gpio_softc *sc, u_long cmd, void *data, int flag, |
| 856 | kauth_cred_t cred) |
| 857 | { |
| 858 | gpio_chipset_tag_t gc; |
| 859 | struct gpio_pin_op *op; |
| 860 | struct gpio_pin_ctl *ctl; |
| 861 | struct gpio_attach *attach; |
| 862 | struct gpio_dev *gdev; |
| 863 | |
| 864 | int error, pin, value, flags; |
| 865 | |
| 866 | gc = sc->sc_gc; |
| 867 | |
| 868 | switch (cmd) { |
| 869 | case GPIOPINREAD: |
| 870 | op = data; |
| 871 | |
| 872 | pin = op->gp_pin; |
| 873 | |
| 874 | if (pin < 0 || pin >= sc->sc_npins) |
| 875 | return EINVAL; |
| 876 | |
| 877 | if (!(sc->sc_pins[pin].pin_flags & GPIO_PIN_SET) && |
| 878 | kauth_authorize_device(cred, KAUTH_DEVICE_GPIO_PINSET, |
| 879 | NULL, NULL, NULL, NULL)) |
| 880 | return EPERM; |
| 881 | |
| 882 | /* return read value */ |
| 883 | op->gp_value = gpiobus_pin_read(gc, pin); |
| 884 | break; |
| 885 | case GPIOPINWRITE: |
| 886 | if ((flag & FWRITE) == 0) |
| 887 | return EBADF; |
| 888 | |
| 889 | op = data; |
| 890 | |
| 891 | pin = op->gp_pin; |
| 892 | |
| 893 | if (pin < 0 || pin >= sc->sc_npins) |
| 894 | return EINVAL; |
| 895 | |
| 896 | if (sc->sc_pins[pin].pin_mapped) |
| 897 | return EBUSY; |
| 898 | |
| 899 | if (!(sc->sc_pins[pin].pin_flags & GPIO_PIN_SET) && |
| 900 | kauth_authorize_device(cred, KAUTH_DEVICE_GPIO_PINSET, |
| 901 | NULL, NULL, NULL, NULL)) |
| 902 | return EPERM; |
| 903 | |
| 904 | value = op->gp_value; |
| 905 | if (value != GPIO_PIN_LOW && value != GPIO_PIN_HIGH) |
| 906 | return EINVAL; |
| 907 | |
| 908 | gpiobus_pin_write(gc, pin, value); |
| 909 | /* return old value */ |
| 910 | op->gp_value = sc->sc_pins[pin].pin_state; |
| 911 | /* update current value */ |
| 912 | sc->sc_pins[pin].pin_state = value; |
| 913 | break; |
| 914 | case GPIOPINTOGGLE: |
| 915 | if ((flag & FWRITE) == 0) |
| 916 | return EBADF; |
| 917 | |
| 918 | op = data; |
| 919 | |
| 920 | pin = op->gp_pin; |
| 921 | |
| 922 | if (pin < 0 || pin >= sc->sc_npins) |
| 923 | return EINVAL; |
| 924 | |
| 925 | if (sc->sc_pins[pin].pin_mapped) |
| 926 | return EBUSY; |
| 927 | |
| 928 | if (!(sc->sc_pins[pin].pin_flags & GPIO_PIN_SET) && |
| 929 | kauth_authorize_device(cred, KAUTH_DEVICE_GPIO_PINSET, |
| 930 | NULL, NULL, NULL, NULL)) |
| 931 | return EPERM; |
| 932 | |
| 933 | value = (sc->sc_pins[pin].pin_state == GPIO_PIN_LOW ? |
| 934 | GPIO_PIN_HIGH : GPIO_PIN_LOW); |
| 935 | gpiobus_pin_write(gc, pin, value); |
| 936 | /* return old value */ |
| 937 | op->gp_value = sc->sc_pins[pin].pin_state; |
| 938 | /* update current value */ |
| 939 | sc->sc_pins[pin].pin_state = value; |
| 940 | break; |
| 941 | case GPIOPINCTL: |
| 942 | ctl = data; |
| 943 | |
| 944 | if (kauth_authorize_device(cred, KAUTH_DEVICE_GPIO_PINSET, |
| 945 | NULL, NULL, NULL, NULL)) |
| 946 | return EPERM; |
| 947 | |
| 948 | pin = ctl->gp_pin; |
| 949 | |
| 950 | if (pin < 0 || pin >= sc->sc_npins) |
| 951 | return EINVAL; |
| 952 | if (sc->sc_pins[pin].pin_mapped) |
| 953 | return EBUSY; |
| 954 | flags = ctl->gp_flags; |
| 955 | |
| 956 | /* check that the controller supports all requested flags */ |
| 957 | if ((flags & sc->sc_pins[pin].pin_caps) != flags) |
| 958 | return ENODEV; |
| 959 | |
| 960 | ctl->gp_caps = sc->sc_pins[pin].pin_caps; |
| 961 | /* return old value */ |
| 962 | ctl->gp_flags = sc->sc_pins[pin].pin_flags; |
| 963 | if (flags > 0) { |
| 964 | gpiobus_pin_ctl(gc, pin, flags); |
| 965 | /* update current value */ |
| 966 | sc->sc_pins[pin].pin_flags = flags; |
| 967 | } |
| 968 | break; |
| 969 | case GPIODETACH50: |
| 970 | /* FALLTHOUGH */ |
| 971 | case GPIODETACH: |
| 972 | if (kauth_authorize_device(cred, KAUTH_DEVICE_GPIO_PINSET, |
| 973 | NULL, NULL, NULL, NULL)) |
| 974 | return EPERM; |
| 975 | |
| 976 | error = 0; |
| 977 | mutex_enter(&sc->sc_mtx); |
| 978 | while (sc->sc_attach_busy) { |
| 979 | error = cv_wait_sig(&sc->sc_attach, &sc->sc_mtx); |
| 980 | if (error) |
| 981 | break; |
| 982 | } |
| 983 | if (!error) |
| 984 | sc->sc_attach_busy = 1; |
| 985 | mutex_exit(&sc->sc_mtx); |
| 986 | if (error) |
| 987 | return EBUSY; |
| 988 | |
| 989 | attach = data; |
| 990 | LIST_FOREACH(gdev, &sc->sc_devs, sc_next) { |
| 991 | if (strcmp(device_xname(gdev->sc_dev), |
| 992 | attach->ga_dvname) == 0) { |
| 993 | mutex_enter(&sc->sc_mtx); |
| 994 | sc->sc_attach_busy = 0; |
| 995 | cv_signal(&sc->sc_attach); |
| 996 | mutex_exit(&sc->sc_mtx); |
| 997 | |
| 998 | if (config_detach(gdev->sc_dev, 0) == 0) |
| 999 | return 0; |
| 1000 | break; |
| 1001 | } |
| 1002 | } |
| 1003 | if (gdev == NULL) { |
| 1004 | mutex_enter(&sc->sc_mtx); |
| 1005 | sc->sc_attach_busy = 0; |
| 1006 | cv_signal(&sc->sc_attach); |
| 1007 | mutex_exit(&sc->sc_mtx); |
| 1008 | } |
| 1009 | return EINVAL; |
| 1010 | |
| 1011 | default: |
| 1012 | return ENOTTY; |
| 1013 | } |
| 1014 | return 0; |
| 1015 | } |
| 1016 | #endif /* COMPAT_50 */ |
| 1017 | |
| 1018 | MODULE(MODULE_CLASS_DRIVER, gpio, NULL); |
| 1019 | |
| 1020 | #ifdef _MODULE |
| 1021 | #include "ioconf.c" |
| 1022 | #endif |
| 1023 | |
| 1024 | static int |
| 1025 | gpio_modcmd(modcmd_t cmd, void *opaque) |
| 1026 | { |
| 1027 | #ifdef _MODULE |
| 1028 | devmajor_t cmajor = NODEVMAJOR, bmajor = NODEVMAJOR; |
| 1029 | int error; |
| 1030 | #endif |
| 1031 | switch (cmd) { |
| 1032 | case MODULE_CMD_INIT: |
| 1033 | #ifdef _MODULE |
| 1034 | error = config_init_component(cfdriver_ioconf_gpio, |
| 1035 | cfattach_ioconf_gpio, cfdata_ioconf_gpio); |
| 1036 | if (error) { |
| 1037 | aprint_error("%s: unable to init component\n" , |
| 1038 | gpio_cd.cd_name); |
| 1039 | return error; |
| 1040 | } |
| 1041 | error = devsw_attach(gpio_cd.cd_name, NULL, &bmajor, |
| 1042 | &gpio_cdevsw, &cmajor); |
| 1043 | if (error) { |
| 1044 | aprint_error("%s: unable to register devsw\n" , |
| 1045 | gpio_cd.cd_name); |
| 1046 | return config_fini_component(cfdriver_ioconf_gpio, |
| 1047 | cfattach_ioconf_gpio, cfdata_ioconf_gpio); |
| 1048 | } |
| 1049 | #endif |
| 1050 | return 0; |
| 1051 | case MODULE_CMD_FINI: |
| 1052 | #ifdef _MODULE |
| 1053 | config_fini_component(cfdriver_ioconf_gpio, |
| 1054 | cfattach_ioconf_gpio, cfdata_ioconf_gpio); |
| 1055 | devsw_detach(NULL, &gpio_cdevsw); |
| 1056 | #endif |
| 1057 | return 0; |
| 1058 | default: |
| 1059 | return ENOTTY; |
| 1060 | } |
| 1061 | } |
| 1062 | |