03302aa37f
The GPIO hardware should not be owned by a single device, this defeats any chance of use of the GPIO controller as an interrupt source. ow(4) is now the only consumer of this 'feature' before we can remove it for good. Discussed with: ian, bsdimp
250 lines
6.1 KiB
C
250 lines
6.1 KiB
C
/*-
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* Copyright (c) 2009 Oleksandr Tymoshenko <gonzo@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_platform.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/gpio.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#ifdef FDT
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#include <dev/fdt/fdt_common.h>
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#include <dev/ofw/ofw_bus.h>
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#endif
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#include <dev/gpio/gpiobusvar.h>
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#include <dev/led/led.h>
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#include "gpiobus_if.h"
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/*
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* Only one pin for led
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*/
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#define GPIOLED_PIN 0
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#define GPIOLED_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx)
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#define GPIOLED_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx)
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#define GPIOLED_LOCK_INIT(_sc) mtx_init(&(_sc)->sc_mtx, \
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device_get_nameunit((_sc)->sc_dev), "gpioled", MTX_DEF)
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#define GPIOLED_LOCK_DESTROY(_sc) mtx_destroy(&(_sc)->sc_mtx)
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struct gpioled_softc
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{
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device_t sc_dev;
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device_t sc_busdev;
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struct mtx sc_mtx;
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struct cdev *sc_leddev;
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};
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static void gpioled_control(void *, int);
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static int gpioled_probe(device_t);
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static int gpioled_attach(device_t);
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static int gpioled_detach(device_t);
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static void
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gpioled_control(void *priv, int onoff)
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{
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struct gpioled_softc *sc;
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sc = (struct gpioled_softc *)priv;
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GPIOLED_LOCK(sc);
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if (GPIOBUS_PIN_SETFLAGS(sc->sc_busdev, sc->sc_dev, GPIOLED_PIN,
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GPIO_PIN_OUTPUT) == 0) {
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GPIOBUS_PIN_SET(sc->sc_busdev, sc->sc_dev, GPIOLED_PIN,
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onoff ? GPIO_PIN_HIGH : GPIO_PIN_LOW);
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}
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GPIOLED_UNLOCK(sc);
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}
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#ifdef FDT
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static void
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gpioled_identify(driver_t *driver, device_t bus)
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{
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phandle_t child, leds, root;
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root = OF_finddevice("/");
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if (root == 0)
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return;
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for (leds = OF_child(root); leds != 0; leds = OF_peer(leds)) {
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if (!fdt_is_compatible_strict(leds, "gpio-leds"))
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continue;
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/* Traverse the 'gpio-leds' node and add its children. */
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for (child = OF_child(leds); child != 0; child = OF_peer(child)) {
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if (!OF_hasprop(child, "gpios"))
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continue;
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if (ofw_gpiobus_add_fdt_child(bus, driver->name, child) == NULL)
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continue;
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}
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}
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}
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#endif
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static int
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gpioled_probe(device_t dev)
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{
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#ifdef FDT
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int match;
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phandle_t node;
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char *compat;
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/*
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* We can match against our own node compatible string and also against
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* our parent node compatible string. The first is normally used to
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* describe leds on a gpiobus and the later when there is a common node
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* compatible with 'gpio-leds' which is used to concentrate all the
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* leds nodes on the dts.
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*/
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match = 0;
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if (ofw_bus_is_compatible(dev, "gpioled"))
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match = 1;
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if (match == 0) {
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if ((node = ofw_bus_get_node(dev)) == -1)
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return (ENXIO);
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if ((node = OF_parent(node)) == -1)
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return (ENXIO);
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if (OF_getprop_alloc(node, "compatible", 1,
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(void **)&compat) == -1)
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return (ENXIO);
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if (strcasecmp(compat, "gpio-leds") == 0)
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match = 1;
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OF_prop_free(compat);
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}
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if (match == 0)
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return (ENXIO);
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#endif
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device_set_desc(dev, "GPIO led");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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gpioled_attach(device_t dev)
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{
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struct gpioled_softc *sc;
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int state;
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#ifdef FDT
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phandle_t node;
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char *default_state;
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char *name;
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#else
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const char *name;
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#endif
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sc = device_get_softc(dev);
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sc->sc_dev = dev;
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sc->sc_busdev = device_get_parent(dev);
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GPIOLED_LOCK_INIT(sc);
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state = 0;
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#ifdef FDT
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if ((node = ofw_bus_get_node(dev)) == -1)
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return (ENXIO);
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if (OF_getprop_alloc(node, "default-state",
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sizeof(char), (void **)&default_state) != -1) {
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if (strcasecmp(default_state, "on") == 0)
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state = 1;
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else if (strcasecmp(default_state, "off") == 0)
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state = 0;
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else if (strcasecmp(default_state, "keep") == 0)
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state = -1;
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else {
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device_printf(dev,
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"unknown value for default-state in FDT\n");
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}
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OF_prop_free(default_state);
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}
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name = NULL;
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if (OF_getprop_alloc(node, "label", 1, (void **)&name) == -1)
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OF_getprop_alloc(node, "name", 1, (void **)&name);
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#else
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if (resource_string_value(device_get_name(dev),
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device_get_unit(dev), "name", &name))
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name = NULL;
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#endif
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sc->sc_leddev = led_create_state(gpioled_control, sc, name ? name :
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device_get_nameunit(dev), state);
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#ifdef FDT
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if (name != NULL)
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OF_prop_free(name);
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#endif
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return (0);
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}
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static int
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gpioled_detach(device_t dev)
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{
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struct gpioled_softc *sc;
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sc = device_get_softc(dev);
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if (sc->sc_leddev) {
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led_destroy(sc->sc_leddev);
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sc->sc_leddev = NULL;
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}
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GPIOLED_LOCK_DESTROY(sc);
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return (0);
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}
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static devclass_t gpioled_devclass;
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static device_method_t gpioled_methods[] = {
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/* Device interface */
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#ifdef FDT
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DEVMETHOD(device_identify, gpioled_identify),
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#endif
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DEVMETHOD(device_probe, gpioled_probe),
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DEVMETHOD(device_attach, gpioled_attach),
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DEVMETHOD(device_detach, gpioled_detach),
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DEVMETHOD_END
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};
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static driver_t gpioled_driver = {
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"gpioled",
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gpioled_methods,
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sizeof(struct gpioled_softc),
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};
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DRIVER_MODULE(gpioled, gpiobus, gpioled_driver, gpioled_devclass, 0, 0);
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MODULE_DEPEND(gpioled, gpiobus, 1, 1, 1);
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