198 lines
5.7 KiB
C
198 lines
5.7 KiB
C
/* $NetBSD: fixedregulator.c,v 1.6 2018/01/28 18:21:52 jmcneill Exp $ */
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/*-
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* Copyright (c) 2015 Jared D. McNeill <jmcneill@invisible.ca>
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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 ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* 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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__KERNEL_RCSID(0, "$NetBSD: fixedregulator.c,v 1.6 2018/01/28 18:21:52 jmcneill Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/device.h>
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#include <sys/kmem.h>
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#include <sys/bus.h>
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#include <sys/gpio.h>
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#include <dev/fdt/fdtvar.h>
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static int fixedregulator_match(device_t, cfdata_t, void *);
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static void fixedregulator_attach(device_t, device_t, void *);
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static int fixedregulator_acquire(device_t);
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static void fixedregulator_release(device_t);
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static int fixedregulator_enable(device_t, bool);
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static int fixedregulator_set_voltage(device_t, u_int, u_int);
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static int fixedregulator_get_voltage(device_t, u_int *);
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struct fdtbus_regulator_controller_func fixedregulator_funcs = {
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.acquire = fixedregulator_acquire,
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.release = fixedregulator_release,
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.enable = fixedregulator_enable,
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.set_voltage = fixedregulator_set_voltage,
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.get_voltage = fixedregulator_get_voltage,
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};
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struct fixedregulator_softc {
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device_t sc_dev;
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int sc_phandle;
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struct fdtbus_gpio_pin *sc_pin;
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bool sc_always_on;
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bool sc_boot_on;
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bool sc_enable_val;
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uint32_t sc_delay;
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uint32_t sc_min_uvol;
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uint32_t sc_max_uvol;
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int sc_gpioflags;
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bool sc_deferred;
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};
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CFATTACH_DECL_NEW(fregulator, sizeof(struct fixedregulator_softc),
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fixedregulator_match, fixedregulator_attach, NULL, NULL);
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static int
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fixedregulator_match(device_t parent, cfdata_t cf, void *aux)
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{
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const char * const compatible[] = { "regulator-fixed", NULL };
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const struct fdt_attach_args *faa = aux;
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return of_match_compatible(faa->faa_phandle, compatible);
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}
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static void
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fixedregulator_attach(device_t parent, device_t self, void *aux)
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{
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struct fixedregulator_softc * const sc = device_private(self);
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const struct fdt_attach_args *faa = aux;
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const int phandle = faa->faa_phandle;
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char *name;
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int len;
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sc->sc_dev = self;
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sc->sc_phandle = phandle;
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aprint_naive("\n");
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len = OF_getproplen(phandle, "regulator-name");
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if (len > 0) {
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name = kmem_zalloc(len, KM_SLEEP);
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if (OF_getprop(phandle, "regulator-name", name, len) == len) {
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aprint_normal(": %s\n", name);
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} else {
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aprint_normal("\n");
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}
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kmem_free(name, len);
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} else {
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aprint_normal("\n");
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}
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sc->sc_gpioflags = GPIO_PIN_OUTPUT;
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if (of_getprop_bool(phandle, "gpio-open-drain"))
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sc->sc_gpioflags |= GPIO_PIN_OPENDRAIN;
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sc->sc_always_on = of_getprop_bool(phandle, "regulator-always-on");
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sc->sc_boot_on = of_getprop_bool(phandle, "regulator-boot-on");
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sc->sc_enable_val = of_getprop_bool(phandle, "enable-active-high");
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if (of_getprop_uint32(phandle, "startup-delay-us", &sc->sc_delay) != 0)
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sc->sc_delay = 0;
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of_getprop_uint32(phandle, "regulator-min-microvolt", &sc->sc_min_uvol);
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of_getprop_uint32(phandle, "regulator-max-microvolt", &sc->sc_max_uvol);
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sc->sc_pin = fdtbus_gpio_acquire(phandle, "gpio", sc->sc_gpioflags);
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if (sc->sc_pin == NULL)
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sc->sc_always_on = OF_getproplen(phandle, "gpio") <= 0;
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fdtbus_register_regulator_controller(self, phandle,
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&fixedregulator_funcs);
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/*
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* If the regulator is flagged as always on or enabled at boot,
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* ensure that it is enabled
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*/
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if (sc->sc_always_on || sc->sc_boot_on)
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fixedregulator_enable(self, true);
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}
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static int
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fixedregulator_acquire(device_t dev)
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{
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struct fixedregulator_softc * const sc = device_private(dev);
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if (sc->sc_pin == NULL && !sc->sc_always_on) {
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sc->sc_pin = fdtbus_gpio_acquire(sc->sc_phandle, "gpio",
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sc->sc_gpioflags);
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if (sc->sc_pin == NULL)
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return ENXIO;
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}
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return 0;
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}
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static void
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fixedregulator_release(device_t dev)
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{
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}
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static int
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fixedregulator_enable(device_t dev, bool enable)
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{
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struct fixedregulator_softc * const sc = device_private(dev);
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if (enable) {
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if (sc->sc_pin != NULL)
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fdtbus_gpio_write_raw(sc->sc_pin, sc->sc_enable_val);
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if (sc->sc_delay > 0)
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delay(sc->sc_delay);
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} else {
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if (sc->sc_always_on)
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return EIO;
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fdtbus_gpio_write_raw(sc->sc_pin, !sc->sc_enable_val);
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}
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return 0;
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}
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static int
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fixedregulator_set_voltage(device_t dev, u_int min_uvol, u_int max_uvol)
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{
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struct fixedregulator_softc * const sc = device_private(dev);
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if (sc->sc_min_uvol > max_uvol || sc->sc_max_uvol < min_uvol)
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return EINVAL;
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return 0;
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}
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static int
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fixedregulator_get_voltage(device_t dev, u_int *uvol)
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{
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struct fixedregulator_softc * const sc = device_private(dev);
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*uvol = sc->sc_min_uvol;
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return 0;
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}
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