e9aebbb018
This fixes the loading of gpioled as a module. Sponsored by: Rubicon Communications (Netgate)
259 lines
6.3 KiB
C
259 lines
6.3 KiB
C
/*-
|
|
* Copyright (c) 2009 Oleksandr Tymoshenko <gonzo@freebsd.org>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include "opt_platform.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/bus.h>
|
|
#include <sys/gpio.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/module.h>
|
|
#include <sys/mutex.h>
|
|
|
|
#ifdef FDT
|
|
#include <dev/fdt/fdt_common.h>
|
|
#include <dev/ofw/ofw_bus.h>
|
|
#endif
|
|
|
|
#include <dev/gpio/gpiobusvar.h>
|
|
#include <dev/led/led.h>
|
|
|
|
#include "gpiobus_if.h"
|
|
|
|
/*
|
|
* Only one pin for led
|
|
*/
|
|
#define GPIOLED_PIN 0
|
|
|
|
#define GPIOLED_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx)
|
|
#define GPIOLED_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx)
|
|
#define GPIOLED_LOCK_INIT(_sc) \
|
|
mtx_init(&_sc->sc_mtx, device_get_nameunit(_sc->sc_dev), \
|
|
"gpioled", MTX_DEF)
|
|
#define GPIOLED_LOCK_DESTROY(_sc) mtx_destroy(&_sc->sc_mtx);
|
|
|
|
struct gpioled_softc
|
|
{
|
|
device_t sc_dev;
|
|
device_t sc_busdev;
|
|
struct mtx sc_mtx;
|
|
struct cdev *sc_leddev;
|
|
};
|
|
|
|
static void gpioled_control(void *, int);
|
|
static int gpioled_probe(device_t);
|
|
static int gpioled_attach(device_t);
|
|
static int gpioled_detach(device_t);
|
|
|
|
static void
|
|
gpioled_control(void *priv, int onoff)
|
|
{
|
|
int error;
|
|
struct gpioled_softc *sc;
|
|
|
|
sc = (struct gpioled_softc *)priv;
|
|
GPIOLED_LOCK(sc);
|
|
error = GPIOBUS_ACQUIRE_BUS(sc->sc_busdev, sc->sc_dev,
|
|
GPIOBUS_DONTWAIT);
|
|
if (error != 0) {
|
|
GPIOLED_UNLOCK(sc);
|
|
return;
|
|
}
|
|
error = GPIOBUS_PIN_SETFLAGS(sc->sc_busdev, sc->sc_dev,
|
|
GPIOLED_PIN, GPIO_PIN_OUTPUT);
|
|
if (error == 0)
|
|
GPIOBUS_PIN_SET(sc->sc_busdev, sc->sc_dev, GPIOLED_PIN,
|
|
onoff ? GPIO_PIN_HIGH : GPIO_PIN_LOW);
|
|
GPIOBUS_RELEASE_BUS(sc->sc_busdev, sc->sc_dev);
|
|
GPIOLED_UNLOCK(sc);
|
|
}
|
|
|
|
#ifdef FDT
|
|
static void
|
|
gpioled_identify(driver_t *driver, device_t bus)
|
|
{
|
|
phandle_t child, leds, root;
|
|
|
|
root = OF_finddevice("/");
|
|
if (root == 0)
|
|
return;
|
|
for (leds = OF_child(root); leds != 0; leds = OF_peer(leds)) {
|
|
if (!fdt_is_compatible_strict(leds, "gpio-leds"))
|
|
continue;
|
|
/* Traverse the 'gpio-leds' node and add its children. */
|
|
for (child = OF_child(leds); child != 0; child = OF_peer(child)) {
|
|
if (!OF_hasprop(child, "gpios"))
|
|
continue;
|
|
if (ofw_gpiobus_add_fdt_child(bus, driver->name, child) == NULL)
|
|
continue;
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
static int
|
|
gpioled_probe(device_t dev)
|
|
{
|
|
#ifdef FDT
|
|
int match;
|
|
phandle_t node;
|
|
char *compat;
|
|
|
|
/*
|
|
* We can match against our own node compatible string and also against
|
|
* our parent node compatible string. The first is normally used to
|
|
* describe leds on a gpiobus and the later when there is a common node
|
|
* compatible with 'gpio-leds' which is used to concentrate all the
|
|
* leds nodes on the dts.
|
|
*/
|
|
match = 0;
|
|
if (ofw_bus_is_compatible(dev, "gpioled"))
|
|
match = 1;
|
|
|
|
if (match == 0) {
|
|
if ((node = ofw_bus_get_node(dev)) == -1)
|
|
return (ENXIO);
|
|
if ((node = OF_parent(node)) == -1)
|
|
return (ENXIO);
|
|
if (OF_getprop_alloc(node, "compatible", 1,
|
|
(void **)&compat) == -1)
|
|
return (ENXIO);
|
|
|
|
if (strcasecmp(compat, "gpio-leds") == 0)
|
|
match = 1;
|
|
|
|
free(compat, M_OFWPROP);
|
|
}
|
|
|
|
if (match == 0)
|
|
return (ENXIO);
|
|
#endif
|
|
device_set_desc(dev, "GPIO led");
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
gpioled_attach(device_t dev)
|
|
{
|
|
struct gpioled_softc *sc;
|
|
int state;
|
|
#ifdef FDT
|
|
phandle_t node;
|
|
char *default_state;
|
|
char *name;
|
|
#else
|
|
const char *name;
|
|
#endif
|
|
|
|
sc = device_get_softc(dev);
|
|
sc->sc_dev = dev;
|
|
sc->sc_busdev = device_get_parent(dev);
|
|
GPIOLED_LOCK_INIT(sc);
|
|
|
|
state = 0;
|
|
|
|
#ifdef FDT
|
|
if ((node = ofw_bus_get_node(dev)) == -1)
|
|
return (ENXIO);
|
|
|
|
if (OF_getprop_alloc(node, "default-state",
|
|
sizeof(char), (void **)&default_state) != -1) {
|
|
if (strcasecmp(default_state, "on") == 0)
|
|
state = 1;
|
|
else if (strcasecmp(default_state, "off") == 0)
|
|
state = 0;
|
|
else if (strcasecmp(default_state, "keep") == 0)
|
|
state = -1;
|
|
else {
|
|
device_printf(dev,
|
|
"unknown value for default-state in FDT\n");
|
|
}
|
|
free(default_state, M_OFWPROP);
|
|
}
|
|
|
|
name = NULL;
|
|
if (OF_getprop_alloc(node, "label", 1, (void **)&name) == -1)
|
|
OF_getprop_alloc(node, "name", 1, (void **)&name);
|
|
#else
|
|
if (resource_string_value(device_get_name(dev),
|
|
device_get_unit(dev), "name", &name))
|
|
name = NULL;
|
|
#endif
|
|
|
|
sc->sc_leddev = led_create_state(gpioled_control, sc, name ? name :
|
|
device_get_nameunit(dev), state);
|
|
#ifdef FDT
|
|
if (name != NULL)
|
|
free(name, M_OFWPROP);
|
|
#endif
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
gpioled_detach(device_t dev)
|
|
{
|
|
struct gpioled_softc *sc;
|
|
|
|
sc = device_get_softc(dev);
|
|
if (sc->sc_leddev) {
|
|
led_destroy(sc->sc_leddev);
|
|
sc->sc_leddev = NULL;
|
|
}
|
|
GPIOLED_LOCK_DESTROY(sc);
|
|
return (0);
|
|
}
|
|
|
|
static devclass_t gpioled_devclass;
|
|
|
|
static device_method_t gpioled_methods[] = {
|
|
/* Device interface */
|
|
#ifdef FDT
|
|
DEVMETHOD(device_identify, gpioled_identify),
|
|
#endif
|
|
DEVMETHOD(device_probe, gpioled_probe),
|
|
DEVMETHOD(device_attach, gpioled_attach),
|
|
DEVMETHOD(device_detach, gpioled_detach),
|
|
|
|
{ 0, 0 }
|
|
};
|
|
|
|
static driver_t gpioled_driver = {
|
|
"gpioled",
|
|
gpioled_methods,
|
|
sizeof(struct gpioled_softc),
|
|
};
|
|
|
|
DRIVER_MODULE(gpioled, gpiobus, gpioled_driver, gpioled_devclass, 0, 0);
|
|
MODULE_DEPEND(gpioled, gpiobus, 1, 1, 1);
|