/* * Utility functions for easier handling of OFW GPIO pins. * * !!! BEWARE !!! * GPIOBUS uses children's IVARs, so we cannot use this interface for cross * tree consumers. * */ static int gpio_pin_get_by_ofw_impl(device_t consumer, phandle_t cnode, char *prop_name, int idx, gpio_pin_t *out_pin) { phandle_t xref; pcell_t *cells; device_t busdev; struct gpiobus_pin pin; int ncells, rv; KASSERT(consumer != NULL && cnode > 0, ("both consumer and cnode required")); rv = ofw_bus_parse_xref_list_alloc(cnode, prop_name, "#gpio-cells", idx, &xref, &ncells, &cells); if (rv != 0) return (rv); /* Translate provider to device. */ pin.dev = OF_device_from_xref(xref); if (pin.dev == NULL) { OF_prop_free(cells); return (ENODEV); } /* Test if GPIO bus already exist. */ busdev = GPIO_GET_BUS(pin.dev); if (busdev == NULL) { OF_prop_free(cells); return (ENODEV); } /* Map GPIO pin. */ rv = gpio_map_gpios(pin.dev, cnode, OF_node_from_xref(xref), ncells, cells, &pin.pin, &pin.flags); OF_prop_free(cells); if (rv != 0) return (ENXIO); /* Reserve GPIO pin. */ rv = gpiobus_acquire_pin(busdev, pin.pin); if (rv != 0) return (EBUSY); *out_pin = malloc(sizeof(struct gpiobus_pin), M_DEVBUF, M_WAITOK | M_ZERO); **out_pin = pin; return (0); }
void gpio_pin_release(gpio_pin_t gpio) { device_t busdev; if (gpio == NULL) return; KASSERT(gpio->dev != NULL, ("invalid pin state")); busdev = GPIO_GET_BUS(gpio->dev); if (busdev != NULL) gpiobus_release_pin(busdev, gpio->pin); /* XXXX Unreserve pin. */ free(gpio, M_DEVBUF); }
static int gpioc_ioctl(struct cdev *cdev, u_long cmd, caddr_t arg, int fflag, struct thread *td) { device_t bus; int max_pin, res; struct gpioc_softc *sc = cdev->si_drv1; struct gpio_pin pin; struct gpio_req req; uint32_t caps; bus = GPIO_GET_BUS(sc->sc_pdev); if (bus == NULL) return (EINVAL); switch (cmd) { case GPIOMAXPIN: max_pin = -1; res = GPIO_PIN_MAX(sc->sc_pdev, &max_pin); bcopy(&max_pin, arg, sizeof(max_pin)); break; case GPIOGETCONFIG: bcopy(arg, &pin, sizeof(pin)); dprintf("get config pin %d\n", pin.gp_pin); res = GPIO_PIN_GETFLAGS(sc->sc_pdev, pin.gp_pin, &pin.gp_flags); /* Fail early */ if (res) break; GPIO_PIN_GETCAPS(sc->sc_pdev, pin.gp_pin, &pin.gp_caps); GPIOBUS_PIN_GETNAME(bus, pin.gp_pin, pin.gp_name); bcopy(&pin, arg, sizeof(pin)); break; case GPIOSETCONFIG: bcopy(arg, &pin, sizeof(pin)); dprintf("set config pin %d\n", pin.gp_pin); res = GPIO_PIN_GETCAPS(sc->sc_pdev, pin.gp_pin, &caps); if (res == 0) res = gpio_check_flags(caps, pin.gp_flags); if (res == 0) res = GPIO_PIN_SETFLAGS(sc->sc_pdev, pin.gp_pin, pin.gp_flags); break; case GPIOGET: bcopy(arg, &req, sizeof(req)); res = GPIO_PIN_GET(sc->sc_pdev, req.gp_pin, &req.gp_value); dprintf("read pin %d -> %d\n", req.gp_pin, req.gp_value); bcopy(&req, arg, sizeof(req)); break; case GPIOSET: bcopy(arg, &req, sizeof(req)); res = GPIO_PIN_SET(sc->sc_pdev, req.gp_pin, req.gp_value); dprintf("write pin %d -> %d\n", req.gp_pin, req.gp_value); break; case GPIOTOGGLE: bcopy(arg, &req, sizeof(req)); dprintf("toggle pin %d\n", req.gp_pin); res = GPIO_PIN_TOGGLE(sc->sc_pdev, req.gp_pin); break; case GPIOSETNAME: bcopy(arg, &pin, sizeof(pin)); dprintf("set name on pin %d\n", pin.gp_pin); res = GPIOBUS_PIN_SETNAME(bus, pin.gp_pin, pin.gp_name); break; default: return (ENOTTY); break; } return (res); }
static int ofw_gpiobus_parse_gpios_impl(device_t consumer, phandle_t cnode, char *pname, struct gpiobus_softc *bussc, struct gpiobus_pin **pins) { int gpiocells, i, j, ncells, npins; pcell_t *gpios; phandle_t gpio; ncells = OF_getencprop_alloc(cnode, pname, sizeof(*gpios), (void **)&gpios); if (ncells == -1) { device_printf(consumer, "Warning: No %s specified in fdt data; " "device may not function.\n", pname); return (-1); } /* * The gpio-specifier is controller independent, the first pcell has * the reference to the GPIO controller phandler. * Count the number of encoded gpio-specifiers on the first pass. */ i = 0; npins = 0; while (i < ncells) { /* Allow NULL specifiers. */ if (gpios[i] == 0) { npins++; i++; continue; } gpio = OF_node_from_xref(gpios[i]); /* If we have bussc, ignore devices from other gpios. */ if (bussc != NULL) if (ofw_bus_get_node(bussc->sc_dev) != gpio) return (0); /* * Check for gpio-controller property and read the #gpio-cells * for this GPIO controller. */ if (!OF_hasprop(gpio, "gpio-controller") || OF_getencprop(gpio, "#gpio-cells", &gpiocells, sizeof(gpiocells)) < 0) { device_printf(consumer, "gpio reference is not a gpio-controller.\n"); OF_prop_free(gpios); return (-1); } if (ncells - i < gpiocells + 1) { device_printf(consumer, "%s cells doesn't match #gpio-cells.\n", pname); return (-1); } npins++; i += gpiocells + 1; } if (npins == 0 || pins == NULL) { if (npins == 0) device_printf(consumer, "no pin specified in %s.\n", pname); OF_prop_free(gpios); return (npins); } *pins = malloc(sizeof(struct gpiobus_pin) * npins, M_DEVBUF, M_NOWAIT | M_ZERO); if (*pins == NULL) { OF_prop_free(gpios); return (-1); } /* Decode the gpio specifier on the second pass. */ i = 0; j = 0; while (i < ncells) { /* Allow NULL specifiers. */ if (gpios[i] == 0) { j++; i++; continue; } gpio = OF_node_from_xref(gpios[i]); /* Read gpio-cells property for this GPIO controller. */ if (OF_getencprop(gpio, "#gpio-cells", &gpiocells, sizeof(gpiocells)) < 0) { device_printf(consumer, "gpio does not have the #gpio-cells property.\n"); goto fail; } /* Return the device reference for the GPIO controller. */ (*pins)[j].dev = OF_device_from_xref(gpios[i]); if ((*pins)[j].dev == NULL) { device_printf(consumer, "no device registered for the gpio controller.\n"); goto fail; } /* * If the gpiobus softc is NULL we use the GPIO_GET_BUS() to * retrieve it. The GPIO_GET_BUS() method is only valid after * the child is probed and attached. */ if (bussc == NULL) { if (GPIO_GET_BUS((*pins)[j].dev) == NULL) { device_printf(consumer, "no gpiobus reference for %s.\n", device_get_nameunit((*pins)[j].dev)); goto fail; } bussc = device_get_softc(GPIO_GET_BUS((*pins)[j].dev)); } /* Get the GPIO pin number and flags. */ if (gpio_map_gpios((*pins)[j].dev, cnode, gpio, gpiocells, &gpios[i + 1], &(*pins)[j].pin, &(*pins)[j].flags) != 0) { device_printf(consumer, "cannot map the gpios specifier.\n"); goto fail; } /* Reserve the GPIO pin. */ if (gpiobus_acquire_pin(bussc->sc_busdev, (*pins)[j].pin) != 0) goto fail; j++; i += gpiocells + 1; } OF_prop_free(gpios); return (npins); fail: OF_prop_free(gpios); free(*pins, M_DEVBUF); return (-1); }