1a623fc2e7
polarity into account. Tegra GPIO pin data includes pin polarity, but so does a regulator-fixed node, so the end result was that the enable value was being swapped twice. Change fregulator to use the raw APIs, and adapt Tegra and Exynos GPIO drivers to support this flag.
148 lines
4.2 KiB
C
148 lines
4.2 KiB
C
/* $NetBSD: fixedregulator.c,v 1.3 2015/12/22 22:19:07 jmcneill Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 2015 Jared D. McNeill <jmcneill@invisible.ca>
|
|
* 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 ``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 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>
|
|
__KERNEL_RCSID(0, "$NetBSD: fixedregulator.c,v 1.3 2015/12/22 22:19:07 jmcneill Exp $");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/device.h>
|
|
#include <sys/kmem.h>
|
|
#include <sys/bus.h>
|
|
#include <sys/gpio.h>
|
|
|
|
#include <dev/fdt/fdtvar.h>
|
|
|
|
static int fixedregulator_match(device_t, cfdata_t, void *);
|
|
static void fixedregulator_attach(device_t, device_t, void *);
|
|
|
|
static int fixedregulator_acquire(device_t);
|
|
static void fixedregulator_release(device_t);
|
|
static int fixedregulator_enable(device_t, bool);
|
|
|
|
struct fdtbus_regulator_controller_func fixedregulator_funcs = {
|
|
.acquire = fixedregulator_acquire,
|
|
.release = fixedregulator_release,
|
|
.enable = fixedregulator_enable
|
|
};
|
|
|
|
struct fixedregulator_softc {
|
|
device_t sc_dev;
|
|
int sc_phandle;
|
|
|
|
struct fdtbus_gpio_pin *sc_pin;
|
|
bool sc_always_on;
|
|
bool sc_enable_val;
|
|
};
|
|
|
|
CFATTACH_DECL_NEW(fregulator, sizeof(struct fixedregulator_softc),
|
|
fixedregulator_match, fixedregulator_attach, NULL, NULL);
|
|
|
|
static int
|
|
fixedregulator_match(device_t parent, cfdata_t cf, void *aux)
|
|
{
|
|
const char * const compatible[] = { "regulator-fixed", NULL };
|
|
const struct fdt_attach_args *faa = aux;
|
|
|
|
return of_match_compatible(faa->faa_phandle, compatible);
|
|
}
|
|
|
|
static void
|
|
fixedregulator_attach(device_t parent, device_t self, void *aux)
|
|
{
|
|
struct fixedregulator_softc * const sc = device_private(self);
|
|
const struct fdt_attach_args *faa = aux;
|
|
const int phandle = faa->faa_phandle;
|
|
char *name;
|
|
int len, gpioflags;
|
|
|
|
sc->sc_dev = self;
|
|
sc->sc_phandle = phandle;
|
|
|
|
aprint_naive("\n");
|
|
|
|
len = OF_getproplen(phandle, "regulator-name");
|
|
if (len > 0) {
|
|
name = kmem_zalloc(len, KM_SLEEP);
|
|
if (OF_getprop(phandle, "regulator-name", name, len) == len) {
|
|
aprint_normal(": %s\n", name);
|
|
} else {
|
|
aprint_normal("\n");
|
|
}
|
|
kmem_free(name, len);
|
|
} else {
|
|
aprint_normal("\n");
|
|
}
|
|
|
|
gpioflags = GPIO_PIN_OUTPUT;
|
|
if (of_getprop_bool(phandle, "gpio-open-drain"))
|
|
gpioflags |= GPIO_PIN_OPENDRAIN;
|
|
|
|
sc->sc_always_on = of_getprop_bool(phandle, "regulator-always-on");
|
|
sc->sc_pin = fdtbus_gpio_acquire(phandle, "gpio", gpioflags);
|
|
if (sc->sc_pin == NULL)
|
|
sc->sc_always_on = true;
|
|
sc->sc_enable_val = of_getprop_bool(phandle, "enable-active-high");
|
|
|
|
fdtbus_register_regulator_controller(self, phandle,
|
|
&fixedregulator_funcs);
|
|
}
|
|
|
|
static int
|
|
fixedregulator_acquire(device_t dev)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
fixedregulator_release(device_t dev)
|
|
{
|
|
}
|
|
|
|
static int
|
|
fixedregulator_enable(device_t dev, bool enable)
|
|
{
|
|
struct fixedregulator_softc * const sc = device_private(dev);
|
|
|
|
if (enable) {
|
|
if (sc->sc_always_on) {
|
|
return 0;
|
|
} else {
|
|
fdtbus_gpio_write_raw(sc->sc_pin, sc->sc_enable_val);
|
|
return 0;
|
|
}
|
|
} else {
|
|
if (sc->sc_always_on) {
|
|
return EIO;
|
|
} else {
|
|
fdtbus_gpio_write_raw(sc->sc_pin, !sc->sc_enable_val);
|
|
return 0;
|
|
}
|
|
}
|
|
}
|