258 lines
6.3 KiB
C
258 lines
6.3 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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int error;
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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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error = GPIOBUS_ACQUIRE_BUS(sc->sc_busdev, sc->sc_dev,
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GPIOBUS_DONTWAIT);
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if (error != 0) {
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GPIOLED_UNLOCK(sc);
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return;
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}
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error = GPIOBUS_PIN_SETFLAGS(sc->sc_busdev, sc->sc_dev,
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GPIOLED_PIN, GPIO_PIN_OUTPUT);
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if (error == 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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GPIOBUS_RELEASE_BUS(sc->sc_busdev, sc->sc_dev);
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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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