342 lines
8.4 KiB
C
342 lines
8.4 KiB
C
/*-
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* Copyright (c) 2016 Jared McNeill <jmcneill@invisible.ca>
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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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/*
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* GPIO controlled regulators
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*/
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#include <sys/cdefs.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/rman.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/gpio.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include <dev/gpio/gpiobusvar.h>
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#include <dev/extres/regulator/regulator.h>
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#include "regdev_if.h"
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struct gpioregulator_state {
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int val;
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uint32_t mask;
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};
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struct gpioregulator_init_def {
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struct regnode_init_def reg_init_def;
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struct gpiobus_pin *enable_pin;
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int enable_pin_valid;
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int startup_delay_us;
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int nstates;
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struct gpioregulator_state *states;
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int npins;
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struct gpiobus_pin **pins;
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};
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struct gpioregulator_reg_sc {
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struct regnode *regnode;
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device_t base_dev;
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struct regnode_std_param *param;
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struct gpioregulator_init_def *def;
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};
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struct gpioregulator_softc {
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device_t dev;
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struct gpioregulator_reg_sc *reg_sc;
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struct gpioregulator_init_def init_def;
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};
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static int
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gpioregulator_regnode_init(struct regnode *regnode)
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{
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struct gpioregulator_reg_sc *sc;
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int error, n;
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sc = regnode_get_softc(regnode);
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if (sc->def->enable_pin_valid == 1) {
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error = gpio_pin_setflags(sc->def->enable_pin, GPIO_PIN_OUTPUT);
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if (error != 0)
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return (error);
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}
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for (n = 0; n < sc->def->npins; n++) {
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error = gpio_pin_setflags(sc->def->pins[n], GPIO_PIN_OUTPUT);
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if (error != 0)
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return (error);
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}
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return (0);
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}
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static int
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gpioregulator_regnode_enable(struct regnode *regnode, bool enable, int *udelay)
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{
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struct gpioregulator_reg_sc *sc;
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bool active;
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int error;
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sc = regnode_get_softc(regnode);
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if (sc->def->enable_pin_valid == 1) {
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active = enable;
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if (!sc->param->enable_active_high)
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active = !active;
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error = gpio_pin_set_active(sc->def->enable_pin, active);
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if (error != 0)
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return (error);
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}
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*udelay = sc->def->startup_delay_us;
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return (0);
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}
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static int
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gpioregulator_regnode_set_voltage(struct regnode *regnode, int min_uvolt,
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int max_uvolt, int *udelay)
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{
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struct gpioregulator_reg_sc *sc;
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const struct gpioregulator_state *state;
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int error, n;
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sc = regnode_get_softc(regnode);
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state = NULL;
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for (n = 0; n < sc->def->nstates; n++) {
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if (sc->def->states[n].val >= min_uvolt &&
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sc->def->states[n].val <= max_uvolt) {
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state = &sc->def->states[n];
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break;
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}
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}
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if (state == NULL)
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return (EINVAL);
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for (n = 0; n < sc->def->npins; n++) {
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error = gpio_pin_set_active(sc->def->pins[n],
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(state->mask >> n) & 1);
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if (error != 0)
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return (error);
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}
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*udelay = sc->def->startup_delay_us;
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return (0);
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}
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static int
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gpioregulator_regnode_get_voltage(struct regnode *regnode, int *uvolt)
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{
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struct gpioregulator_reg_sc *sc;
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uint32_t mask;
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int error, n;
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bool active;
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sc = regnode_get_softc(regnode);
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mask = 0;
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for (n = 0; n < sc->def->npins; n++) {
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error = gpio_pin_is_active(sc->def->pins[n], &active);
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if (error != 0)
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return (error);
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mask |= (active << n);
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}
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for (n = 0; n < sc->def->nstates; n++) {
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if (sc->def->states[n].mask == mask) {
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*uvolt = sc->def->states[n].val;
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return (0);
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}
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}
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return (EIO);
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}
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static regnode_method_t gpioregulator_regnode_methods[] = {
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/* Regulator interface */
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REGNODEMETHOD(regnode_init, gpioregulator_regnode_init),
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REGNODEMETHOD(regnode_enable, gpioregulator_regnode_enable),
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REGNODEMETHOD(regnode_set_voltage, gpioregulator_regnode_set_voltage),
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REGNODEMETHOD(regnode_get_voltage, gpioregulator_regnode_get_voltage),
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REGNODEMETHOD_END
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};
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DEFINE_CLASS_1(gpioregulator_regnode, gpioregulator_regnode_class,
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gpioregulator_regnode_methods, sizeof(struct gpioregulator_reg_sc),
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regnode_class);
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static int
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gpioregulator_parse_fdt(struct gpioregulator_softc *sc)
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{
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uint32_t *pstates, mask;
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phandle_t node;
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ssize_t len;
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int error, n;
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node = ofw_bus_get_node(sc->dev);
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pstates = NULL;
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mask = 0;
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error = regulator_parse_ofw_stdparam(sc->dev, node,
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&sc->init_def.reg_init_def);
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if (error != 0)
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return (error);
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/* "states" property (required) */
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len = OF_getencprop_alloc_multi(node, "states", sizeof(*pstates),
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(void **)&pstates);
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if (len < 2) {
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device_printf(sc->dev, "invalid 'states' property\n");
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error = EINVAL;
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goto done;
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}
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sc->init_def.nstates = len / 2;
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sc->init_def.states = malloc(sc->init_def.nstates *
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sizeof(*sc->init_def.states), M_DEVBUF, M_WAITOK);
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for (n = 0; n < sc->init_def.nstates; n++) {
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sc->init_def.states[n].val = pstates[n * 2 + 0];
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sc->init_def.states[n].mask = pstates[n * 2 + 1];
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mask |= sc->init_def.states[n].mask;
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}
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/* "startup-delay-us" property (optional) */
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len = OF_getencprop(node, "startup-delay-us",
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&sc->init_def.startup_delay_us,
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sizeof(sc->init_def.startup_delay_us));
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if (len <= 0)
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sc->init_def.startup_delay_us = 0;
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/* "enable-gpio" property (optional) */
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error = gpio_pin_get_by_ofw_property(sc->dev, node, "enable-gpio",
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&sc->init_def.enable_pin);
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if (error == 0)
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sc->init_def.enable_pin_valid = 1;
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/* "gpios" property */
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sc->init_def.npins = 32 - __builtin_clz(mask);
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sc->init_def.pins = malloc(sc->init_def.npins *
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sizeof(sc->init_def.pins), M_DEVBUF, M_WAITOK | M_ZERO);
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for (n = 0; n < sc->init_def.npins; n++) {
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error = gpio_pin_get_by_ofw_idx(sc->dev, node, n,
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&sc->init_def.pins[n]);
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if (error != 0) {
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device_printf(sc->dev, "cannot get pin %d\n", n);
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goto done;
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}
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}
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done:
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if (error != 0) {
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for (n = 0; n < sc->init_def.npins; n++) {
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if (sc->init_def.pins[n] != NULL)
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gpio_pin_release(sc->init_def.pins[n]);
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}
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free(sc->init_def.states, M_DEVBUF);
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free(sc->init_def.pins, M_DEVBUF);
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}
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OF_prop_free(pstates);
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return (error);
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}
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static int
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gpioregulator_probe(device_t dev)
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{
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if (!ofw_bus_is_compatible(dev, "regulator-gpio"))
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return (ENXIO);
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device_set_desc(dev, "GPIO controlled regulator");
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return (BUS_PROBE_GENERIC);
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}
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static int
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gpioregulator_attach(device_t dev)
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{
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struct gpioregulator_softc *sc;
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struct regnode *regnode;
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phandle_t node;
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int error;
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sc = device_get_softc(dev);
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sc->dev = dev;
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node = ofw_bus_get_node(dev);
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error = gpioregulator_parse_fdt(sc);
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if (error != 0) {
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device_printf(dev, "cannot parse parameters\n");
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return (ENXIO);
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}
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sc->init_def.reg_init_def.id = 1;
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sc->init_def.reg_init_def.ofw_node = node;
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regnode = regnode_create(dev, &gpioregulator_regnode_class,
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&sc->init_def.reg_init_def);
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if (regnode == NULL) {
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device_printf(dev, "cannot create regulator\n");
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return (ENXIO);
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}
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sc->reg_sc = regnode_get_softc(regnode);
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sc->reg_sc->regnode = regnode;
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sc->reg_sc->base_dev = dev;
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sc->reg_sc->param = regnode_get_stdparam(regnode);
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sc->reg_sc->def = &sc->init_def;
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regnode_register(regnode);
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return (0);
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}
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static device_method_t gpioregulator_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, gpioregulator_probe),
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DEVMETHOD(device_attach, gpioregulator_attach),
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/* Regdev interface */
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DEVMETHOD(regdev_map, regdev_default_ofw_map),
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DEVMETHOD_END
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};
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static driver_t gpioregulator_driver = {
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"gpioregulator",
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gpioregulator_methods,
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sizeof(struct gpioregulator_softc),
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};
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EARLY_DRIVER_MODULE(gpioregulator, simplebus, gpioregulator_driver, 0, 0,
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BUS_PASS_INTERRUPT + BUS_PASS_ORDER_LAST);
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MODULE_VERSION(gpioregulator, 1);
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