Annotation of sys/dev/gpio/gpio.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: gpio.c,v 1.7 2006/03/26 18:48:17 grange Exp $ */
! 2:
! 3: /*
! 4: * Copyright (c) 2004, 2006 Alexander Yurchenko <grange@openbsd.org>
! 5: *
! 6: * Permission to use, copy, modify, and distribute this software for any
! 7: * purpose with or without fee is hereby granted, provided that the above
! 8: * copyright notice and this permission notice appear in all copies.
! 9: *
! 10: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
! 11: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
! 12: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
! 13: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
! 14: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
! 15: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
! 16: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
! 17: */
! 18:
! 19: /*
! 20: * General Purpose Input/Output framework.
! 21: */
! 22:
! 23: #include <sys/param.h>
! 24: #include <sys/systm.h>
! 25: #include <sys/conf.h>
! 26: #include <sys/device.h>
! 27: #include <sys/fcntl.h>
! 28: #include <sys/ioctl.h>
! 29: #include <sys/gpio.h>
! 30: #include <sys/vnode.h>
! 31:
! 32: #include <dev/gpio/gpiovar.h>
! 33:
! 34: struct gpio_softc {
! 35: struct device sc_dev;
! 36:
! 37: gpio_chipset_tag_t sc_gc; /* our GPIO controller */
! 38: gpio_pin_t *sc_pins; /* pins array */
! 39: int sc_npins; /* total number of pins */
! 40:
! 41: int sc_opened;
! 42: };
! 43:
! 44: int gpio_match(struct device *, void *, void *);
! 45: void gpio_attach(struct device *, struct device *, void *);
! 46: int gpio_detach(struct device *, int);
! 47: int gpio_search(struct device *, void *, void *);
! 48: int gpio_print(void *, const char *);
! 49:
! 50: struct cfattach gpio_ca = {
! 51: sizeof (struct gpio_softc),
! 52: gpio_match,
! 53: gpio_attach,
! 54: gpio_detach
! 55: };
! 56:
! 57: struct cfdriver gpio_cd = {
! 58: NULL, "gpio", DV_DULL
! 59: };
! 60:
! 61: int
! 62: gpio_match(struct device *parent, void *match, void *aux)
! 63: {
! 64: struct cfdata *cf = match;
! 65: struct gpiobus_attach_args *gba = aux;
! 66:
! 67: if (strcmp(gba->gba_name, cf->cf_driver->cd_name) != 0)
! 68: return (0);
! 69:
! 70: return (1);
! 71: }
! 72:
! 73: void
! 74: gpio_attach(struct device *parent, struct device *self, void *aux)
! 75: {
! 76: struct gpio_softc *sc = (struct gpio_softc *)self;
! 77: struct gpiobus_attach_args *gba = aux;
! 78:
! 79: sc->sc_gc = gba->gba_gc;
! 80: sc->sc_pins = gba->gba_pins;
! 81: sc->sc_npins = gba->gba_npins;
! 82:
! 83: printf(": %d pins\n", sc->sc_npins);
! 84:
! 85: /*
! 86: * Attach all devices that can be connected to the GPIO pins
! 87: * described in the kernel configuration file.
! 88: */
! 89: config_search(gpio_search, self, sc);
! 90: }
! 91:
! 92: int
! 93: gpio_detach(struct device *self, int flags)
! 94: {
! 95: int maj, mn;
! 96:
! 97: /* Locate the major number */
! 98: for (maj = 0; maj < nchrdev; maj++)
! 99: if (cdevsw[maj].d_open == gpioopen)
! 100: break;
! 101:
! 102: /* Nuke the vnodes for any open instances (calls close) */
! 103: mn = self->dv_unit;
! 104: vdevgone(maj, mn, mn, VCHR);
! 105:
! 106: return (0);
! 107: }
! 108:
! 109: int
! 110: gpio_search(struct device *parent, void *arg, void *aux)
! 111: {
! 112: struct cfdata *cf = arg;
! 113: struct gpio_attach_args ga;
! 114:
! 115: ga.ga_gpio = aux;
! 116: ga.ga_offset = cf->cf_loc[0];
! 117: ga.ga_mask = cf->cf_loc[1];
! 118:
! 119: if (cf->cf_attach->ca_match(parent, cf, &ga) > 0)
! 120: config_attach(parent, cf, &ga, gpio_print);
! 121:
! 122: return (0);
! 123: }
! 124:
! 125: int
! 126: gpio_print(void *aux, const char *pnp)
! 127: {
! 128: struct gpio_attach_args *ga = aux;
! 129: int i;
! 130:
! 131: printf(" pins");
! 132: for (i = 0; i < 32; i++)
! 133: if (ga->ga_mask & (1 << i))
! 134: printf(" %d", ga->ga_offset + i);
! 135:
! 136: return (UNCONF);
! 137: }
! 138:
! 139: int
! 140: gpiobus_print(void *aux, const char *pnp)
! 141: {
! 142: struct gpiobus_attach_args *gba = aux;
! 143:
! 144: if (pnp != NULL)
! 145: printf("%s at %s", gba->gba_name, pnp);
! 146:
! 147: return (UNCONF);
! 148: }
! 149:
! 150: int
! 151: gpio_pin_map(void *gpio, int offset, u_int32_t mask, struct gpio_pinmap *map)
! 152: {
! 153: struct gpio_softc *sc = gpio;
! 154: int npins, pin, i;
! 155:
! 156: npins = gpio_npins(mask);
! 157: if (npins > sc->sc_npins)
! 158: return (1);
! 159:
! 160: for (npins = 0, i = 0; i < 32; i++)
! 161: if (mask & (1 << i)) {
! 162: pin = offset + i;
! 163: if (pin < 0 || pin >= sc->sc_npins)
! 164: return (1);
! 165: if (sc->sc_pins[pin].pin_mapped)
! 166: return (1);
! 167: sc->sc_pins[pin].pin_mapped = 1;
! 168: map->pm_map[npins++] = pin;
! 169: }
! 170: map->pm_size = npins;
! 171:
! 172: return (0);
! 173: }
! 174:
! 175: void
! 176: gpio_pin_unmap(void *gpio, struct gpio_pinmap *map)
! 177: {
! 178: struct gpio_softc *sc = gpio;
! 179: int pin, i;
! 180:
! 181: for (i = 0; i < map->pm_size; i++) {
! 182: pin = map->pm_map[i];
! 183: sc->sc_pins[pin].pin_mapped = 0;
! 184: }
! 185: }
! 186:
! 187: int
! 188: gpio_pin_read(void *gpio, struct gpio_pinmap *map, int pin)
! 189: {
! 190: struct gpio_softc *sc = gpio;
! 191:
! 192: return (gpiobus_pin_read(sc->sc_gc, map->pm_map[pin]));
! 193: }
! 194:
! 195: void
! 196: gpio_pin_write(void *gpio, struct gpio_pinmap *map, int pin, int value)
! 197: {
! 198: struct gpio_softc *sc = gpio;
! 199:
! 200: return (gpiobus_pin_write(sc->sc_gc, map->pm_map[pin], value));
! 201: }
! 202:
! 203: void
! 204: gpio_pin_ctl(void *gpio, struct gpio_pinmap *map, int pin, int flags)
! 205: {
! 206: struct gpio_softc *sc = gpio;
! 207:
! 208: return (gpiobus_pin_ctl(sc->sc_gc, map->pm_map[pin], flags));
! 209: }
! 210:
! 211: int
! 212: gpio_pin_caps(void *gpio, struct gpio_pinmap *map, int pin)
! 213: {
! 214: struct gpio_softc *sc = gpio;
! 215:
! 216: return (sc->sc_pins[map->pm_map[pin]].pin_caps);
! 217: }
! 218:
! 219: int
! 220: gpio_npins(u_int32_t mask)
! 221: {
! 222: int npins, i;
! 223:
! 224: for (npins = 0, i = 0; i < 32; i++)
! 225: if (mask & (1 << i))
! 226: npins++;
! 227:
! 228: return (npins);
! 229: }
! 230:
! 231: int
! 232: gpioopen(dev_t dev, int flag, int mode, struct proc *p)
! 233: {
! 234: struct gpio_softc *sc;
! 235:
! 236: sc = (struct gpio_softc *)device_lookup(&gpio_cd, minor(dev));
! 237: if (sc == NULL)
! 238: return (ENXIO);
! 239:
! 240: if (sc->sc_opened)
! 241: return (EBUSY);
! 242: sc->sc_opened = 1;
! 243:
! 244: return (0);
! 245: }
! 246:
! 247: int
! 248: gpioclose(dev_t dev, int flag, int mode, struct proc *p)
! 249: {
! 250: struct gpio_softc *sc;
! 251:
! 252: sc = (struct gpio_softc *)device_lookup(&gpio_cd, minor(dev));
! 253: sc->sc_opened = 0;
! 254:
! 255: return (0);
! 256: }
! 257:
! 258: int
! 259: gpioioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p)
! 260: {
! 261: struct gpio_softc *sc;
! 262: gpio_chipset_tag_t gc;
! 263: struct gpio_info *info;
! 264: struct gpio_pin_op *op;
! 265: struct gpio_pin_ctl *ctl;
! 266: int pin, value, flags;
! 267:
! 268: sc = (struct gpio_softc *)device_lookup(&gpio_cd, minor(dev));
! 269: gc = sc->sc_gc;
! 270:
! 271: switch (cmd) {
! 272: case GPIOINFO:
! 273: info = (struct gpio_info *)data;
! 274:
! 275: info->gpio_npins = sc->sc_npins;
! 276: break;
! 277: case GPIOPINREAD:
! 278: op = (struct gpio_pin_op *)data;
! 279:
! 280: pin = op->gp_pin;
! 281: if (pin < 0 || pin >= sc->sc_npins)
! 282: return (EINVAL);
! 283:
! 284: /* return read value */
! 285: op->gp_value = gpiobus_pin_read(gc, pin);
! 286: break;
! 287: case GPIOPINWRITE:
! 288: if ((flag & FWRITE) == 0)
! 289: return (EBADF);
! 290:
! 291: op = (struct gpio_pin_op *)data;
! 292:
! 293: pin = op->gp_pin;
! 294: if (pin < 0 || pin >= sc->sc_npins)
! 295: return (EINVAL);
! 296: if (sc->sc_pins[pin].pin_mapped)
! 297: return (EBUSY);
! 298:
! 299: value = op->gp_value;
! 300: if (value != GPIO_PIN_LOW && value != GPIO_PIN_HIGH)
! 301: return (EINVAL);
! 302:
! 303: gpiobus_pin_write(gc, pin, value);
! 304: /* return old value */
! 305: op->gp_value = sc->sc_pins[pin].pin_state;
! 306: /* update current value */
! 307: sc->sc_pins[pin].pin_state = value;
! 308: break;
! 309: case GPIOPINTOGGLE:
! 310: if ((flag & FWRITE) == 0)
! 311: return (EBADF);
! 312:
! 313: op = (struct gpio_pin_op *)data;
! 314:
! 315: pin = op->gp_pin;
! 316: if (pin < 0 || pin >= sc->sc_npins)
! 317: return (EINVAL);
! 318: if (sc->sc_pins[pin].pin_mapped)
! 319: return (EBUSY);
! 320:
! 321: value = (sc->sc_pins[pin].pin_state == GPIO_PIN_LOW ?
! 322: GPIO_PIN_HIGH : GPIO_PIN_LOW);
! 323: gpiobus_pin_write(gc, pin, value);
! 324: /* return old value */
! 325: op->gp_value = sc->sc_pins[pin].pin_state;
! 326: /* update current value */
! 327: sc->sc_pins[pin].pin_state = value;
! 328: break;
! 329: case GPIOPINCTL:
! 330: if ((flag & FWRITE) == 0)
! 331: return (EBADF);
! 332:
! 333: ctl = (struct gpio_pin_ctl *)data;
! 334:
! 335: pin = ctl->gp_pin;
! 336: if (pin < 0 || pin >= sc->sc_npins)
! 337: return (EINVAL);
! 338: if (sc->sc_pins[pin].pin_mapped)
! 339: return (EBUSY);
! 340:
! 341: flags = ctl->gp_flags;
! 342: /* check that the controller supports all requested flags */
! 343: if ((flags & sc->sc_pins[pin].pin_caps) != flags)
! 344: return (ENODEV);
! 345:
! 346: ctl->gp_caps = sc->sc_pins[pin].pin_caps;
! 347: /* return old value */
! 348: ctl->gp_flags = sc->sc_pins[pin].pin_flags;
! 349: if (flags > 0) {
! 350: gpiobus_pin_ctl(gc, pin, flags);
! 351: /* update current value */
! 352: sc->sc_pins[pin].pin_flags = flags;
! 353: }
! 354: break;
! 355: default:
! 356: return (ENOTTY);
! 357: }
! 358:
! 359: return (0);
! 360: }
CVSweb
![[BACK]](/icons/back.gif){kind=icon}
Return to gpio.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / sys / dev / gpio