Add driver for GPIO controlled regulator.
Reviewed by: gonzo, manu, mmel Differential Revision: https://reviews.freebsd.org/D8257
This commit is contained in:
parent
23421d5492
commit
72f1cf0446
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=307382
@ -112,6 +112,7 @@ device icee
|
||||
# GPIO
|
||||
device gpio
|
||||
device gpioled
|
||||
device gpioregulator
|
||||
|
||||
# SPI
|
||||
device spibus
|
||||
|
@ -1573,6 +1573,7 @@ dev/gpio/gpioc.c optional gpio \
|
||||
dependency "gpio_if.h"
|
||||
dev/gpio/gpioiic.c optional gpioiic
|
||||
dev/gpio/gpioled.c optional gpioled
|
||||
dev/gpio/gpioregulator.c optional gpioregulator fdt ext_resources
|
||||
dev/gpio/gpiospi.c optional gpiospi
|
||||
dev/gpio/gpio_if.m optional gpio
|
||||
dev/gpio/gpiobus_if.m optional gpio
|
||||
|
348
sys/dev/gpio/gpioregulator.c
Normal file
348
sys/dev/gpio/gpioregulator.c
Normal file
@ -0,0 +1,348 @@
|
||||
/*-
|
||||
* Copyright (c) 2016 Jared 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.
|
||||
*
|
||||
* $FreeBSD$
|
||||
*/
|
||||
|
||||
/*
|
||||
* GPIO controlled regulators
|
||||
*/
|
||||
|
||||
#include <sys/cdefs.h>
|
||||
__FBSDID("$FreeBSD$");
|
||||
|
||||
#include <sys/param.h>
|
||||
#include <sys/systm.h>
|
||||
#include <sys/bus.h>
|
||||
#include <sys/rman.h>
|
||||
#include <sys/kernel.h>
|
||||
#include <sys/module.h>
|
||||
#include <sys/gpio.h>
|
||||
|
||||
#include <dev/ofw/ofw_bus.h>
|
||||
#include <dev/ofw/ofw_bus_subr.h>
|
||||
|
||||
#include <dev/gpio/gpiobusvar.h>
|
||||
|
||||
#include <dev/extres/regulator/regulator.h>
|
||||
|
||||
#include "regdev_if.h"
|
||||
|
||||
struct gpioregulator_state {
|
||||
int val;
|
||||
uint32_t mask;
|
||||
};
|
||||
|
||||
struct gpioregulator_init_def {
|
||||
struct regnode_init_def reg_init_def;
|
||||
struct gpiobus_pin *enable_pin;
|
||||
int enable_pin_valid;
|
||||
int startup_delay_us;
|
||||
int nstates;
|
||||
struct gpioregulator_state *states;
|
||||
int npins;
|
||||
struct gpiobus_pin **pins;
|
||||
};
|
||||
|
||||
struct gpioregulator_reg_sc {
|
||||
struct regnode *regnode;
|
||||
device_t base_dev;
|
||||
struct regnode_std_param *param;
|
||||
struct gpioregulator_init_def *def;
|
||||
};
|
||||
|
||||
struct gpioregulator_softc {
|
||||
device_t dev;
|
||||
struct gpioregulator_reg_sc *reg_sc;
|
||||
struct gpioregulator_init_def init_def;
|
||||
};
|
||||
|
||||
static int
|
||||
gpioregulator_regnode_init(struct regnode *regnode)
|
||||
{
|
||||
struct gpioregulator_reg_sc *sc;
|
||||
int error, n;
|
||||
|
||||
sc = regnode_get_softc(regnode);
|
||||
|
||||
if (sc->def->enable_pin_valid == 1) {
|
||||
error = gpio_pin_setflags(sc->def->enable_pin, GPIO_PIN_OUTPUT);
|
||||
if (error != 0)
|
||||
return (error);
|
||||
}
|
||||
|
||||
for (n = 0; n < sc->def->npins; n++) {
|
||||
error = gpio_pin_setflags(sc->def->pins[n], GPIO_PIN_OUTPUT);
|
||||
if (error != 0)
|
||||
return (error);
|
||||
}
|
||||
|
||||
return (0);
|
||||
}
|
||||
|
||||
static int
|
||||
gpioregulator_regnode_enable(struct regnode *regnode, bool enable, int *udelay)
|
||||
{
|
||||
struct gpioregulator_reg_sc *sc;
|
||||
bool active;
|
||||
int error;
|
||||
|
||||
sc = regnode_get_softc(regnode);
|
||||
|
||||
if (sc->def->enable_pin_valid == 1) {
|
||||
active = enable;
|
||||
if (!sc->param->enable_active_high)
|
||||
active = !active;
|
||||
error = gpio_pin_set_active(sc->def->enable_pin, active);
|
||||
if (error != 0)
|
||||
return (error);
|
||||
}
|
||||
|
||||
*udelay = sc->def->startup_delay_us;
|
||||
|
||||
return (0);
|
||||
}
|
||||
|
||||
static int
|
||||
gpioregulator_regnode_set_voltage(struct regnode *regnode, int min_uvolt,
|
||||
int max_uvolt, int *udelay)
|
||||
{
|
||||
struct gpioregulator_reg_sc *sc;
|
||||
const struct gpioregulator_state *state;
|
||||
int error, n;
|
||||
|
||||
sc = regnode_get_softc(regnode);
|
||||
state = NULL;
|
||||
|
||||
for (n = 0; n < sc->def->nstates; n++) {
|
||||
if (sc->def->states[n].val >= min_uvolt &&
|
||||
sc->def->states[n].val <= max_uvolt) {
|
||||
state = &sc->def->states[n];
|
||||
break;
|
||||
}
|
||||
}
|
||||
if (state == NULL)
|
||||
return (EINVAL);
|
||||
|
||||
for (n = 0; n < sc->def->npins; n++) {
|
||||
error = gpio_pin_set_active(sc->def->pins[n],
|
||||
(state->mask >> n) & 1);
|
||||
if (error != 0)
|
||||
return (error);
|
||||
}
|
||||
|
||||
*udelay = sc->def->startup_delay_us;
|
||||
|
||||
return (0);
|
||||
}
|
||||
|
||||
static int
|
||||
gpioregulator_regnode_get_voltage(struct regnode *regnode, int *uvolt)
|
||||
{
|
||||
struct gpioregulator_reg_sc *sc;
|
||||
uint32_t mask;
|
||||
int error, n;
|
||||
bool active;
|
||||
|
||||
sc = regnode_get_softc(regnode);
|
||||
mask = 0;
|
||||
|
||||
for (n = 0; n < sc->def->npins; n++) {
|
||||
error = gpio_pin_is_active(sc->def->pins[n], &active);
|
||||
if (error != 0)
|
||||
return (error);
|
||||
mask |= (active << n);
|
||||
}
|
||||
|
||||
for (n = 0; n < sc->def->nstates; n++) {
|
||||
if (sc->def->states[n].mask == mask) {
|
||||
*uvolt = sc->def->states[n].val;
|
||||
return (0);
|
||||
}
|
||||
}
|
||||
|
||||
return (EIO);
|
||||
}
|
||||
|
||||
static regnode_method_t gpioregulator_regnode_methods[] = {
|
||||
/* Regulator interface */
|
||||
REGNODEMETHOD(regnode_init, gpioregulator_regnode_init),
|
||||
REGNODEMETHOD(regnode_enable, gpioregulator_regnode_enable),
|
||||
REGNODEMETHOD(regnode_set_voltage, gpioregulator_regnode_set_voltage),
|
||||
REGNODEMETHOD(regnode_get_voltage, gpioregulator_regnode_get_voltage),
|
||||
REGNODEMETHOD_END
|
||||
};
|
||||
DEFINE_CLASS_1(gpioregulator_regnode, gpioregulator_regnode_class,
|
||||
gpioregulator_regnode_methods, sizeof(struct gpioregulator_reg_sc),
|
||||
regnode_class);
|
||||
|
||||
static int
|
||||
gpioregulator_parse_fdt(struct gpioregulator_softc *sc)
|
||||
{
|
||||
uint32_t *pstates, mask;
|
||||
phandle_t node;
|
||||
ssize_t len;
|
||||
int error, n;
|
||||
|
||||
node = ofw_bus_get_node(sc->dev);
|
||||
pstates = NULL;
|
||||
mask = 0;
|
||||
|
||||
error = regulator_parse_ofw_stdparam(sc->dev, node,
|
||||
&sc->init_def.reg_init_def);
|
||||
if (error != 0)
|
||||
return (error);
|
||||
|
||||
/* "states" property (required) */
|
||||
len = OF_getencprop_alloc(node, "states", sizeof(*pstates),
|
||||
(void **)&pstates);
|
||||
if (len < 2) {
|
||||
device_printf(sc->dev, "invalid 'states' property\n");
|
||||
error = EINVAL;
|
||||
goto done;
|
||||
}
|
||||
sc->init_def.nstates = len / 2;
|
||||
sc->init_def.states = malloc(sc->init_def.nstates *
|
||||
sizeof(*sc->init_def.states), M_DEVBUF, M_WAITOK);
|
||||
for (n = 0; n < sc->init_def.nstates; n++) {
|
||||
sc->init_def.states[n].val = pstates[n * 2 + 0];
|
||||
sc->init_def.states[n].mask = pstates[n * 2 + 1];
|
||||
mask |= sc->init_def.states[n].mask;
|
||||
}
|
||||
|
||||
/* "startup-delay-us" property (optional) */
|
||||
len = OF_getencprop(node, "startup-delay-us",
|
||||
&sc->init_def.startup_delay_us,
|
||||
sizeof(sc->init_def.startup_delay_us));
|
||||
if (len <= 0)
|
||||
sc->init_def.startup_delay_us = 0;
|
||||
|
||||
/* "enable-gpio" property (optional) */
|
||||
error = gpio_pin_get_by_ofw_property(sc->dev, node, "enable-gpio",
|
||||
&sc->init_def.enable_pin);
|
||||
if (error == 0)
|
||||
sc->init_def.enable_pin_valid = 1;
|
||||
|
||||
/* "gpios" property */
|
||||
sc->init_def.npins = 32 - __builtin_clz(mask);
|
||||
sc->init_def.pins = malloc(sc->init_def.npins *
|
||||
sizeof(sc->init_def.pins), M_DEVBUF, M_WAITOK);
|
||||
for (n = 0; n < sc->init_def.npins; n++) {
|
||||
error = gpio_pin_get_by_ofw_idx(sc->dev, node, n,
|
||||
&sc->init_def.pins[n]);
|
||||
if (error != 0) {
|
||||
device_printf(sc->dev, "cannot get pin %d\n", n);
|
||||
goto done;
|
||||
}
|
||||
}
|
||||
|
||||
done:
|
||||
if (error != 0) {
|
||||
for (n = 0; n < sc->init_def.npins; n++) {
|
||||
if (sc->init_def.pins[n] != NULL)
|
||||
gpio_pin_release(sc->init_def.pins[n]);
|
||||
}
|
||||
|
||||
free(sc->init_def.states, M_DEVBUF);
|
||||
free(sc->init_def.pins, M_DEVBUF);
|
||||
|
||||
}
|
||||
OF_prop_free(pstates);
|
||||
|
||||
return (error);
|
||||
}
|
||||
|
||||
static int
|
||||
gpioregulator_probe(device_t dev)
|
||||
{
|
||||
|
||||
if (!ofw_bus_is_compatible(dev, "regulator-gpio"))
|
||||
return (ENXIO);
|
||||
|
||||
device_set_desc(dev, "GPIO controlled regulator");
|
||||
return (BUS_PROBE_GENERIC);
|
||||
}
|
||||
|
||||
static int
|
||||
gpioregulator_attach(device_t dev)
|
||||
{
|
||||
struct gpioregulator_softc *sc;
|
||||
struct regnode *regnode;
|
||||
phandle_t node;
|
||||
int error;
|
||||
|
||||
sc = device_get_softc(dev);
|
||||
sc->dev = dev;
|
||||
node = ofw_bus_get_node(dev);
|
||||
|
||||
error = gpioregulator_parse_fdt(sc);
|
||||
if (error != 0) {
|
||||
device_printf(dev, "cannot parse parameters\n");
|
||||
return (ENXIO);
|
||||
}
|
||||
sc->init_def.reg_init_def.id = 1;
|
||||
sc->init_def.reg_init_def.ofw_node = node;
|
||||
|
||||
regnode = regnode_create(dev, &gpioregulator_regnode_class,
|
||||
&sc->init_def.reg_init_def);
|
||||
if (regnode == NULL) {
|
||||
device_printf(dev, "cannot create regulator\n");
|
||||
return (ENXIO);
|
||||
}
|
||||
|
||||
sc->reg_sc = regnode_get_softc(regnode);
|
||||
sc->reg_sc->regnode = regnode;
|
||||
sc->reg_sc->base_dev = dev;
|
||||
sc->reg_sc->param = regnode_get_stdparam(regnode);
|
||||
sc->reg_sc->def = &sc->init_def;
|
||||
|
||||
regnode_register(regnode);
|
||||
|
||||
return (0);
|
||||
}
|
||||
|
||||
|
||||
static device_method_t gpioregulator_methods[] = {
|
||||
/* Device interface */
|
||||
DEVMETHOD(device_probe, gpioregulator_probe),
|
||||
DEVMETHOD(device_attach, gpioregulator_attach),
|
||||
|
||||
/* Regdev interface */
|
||||
DEVMETHOD(regdev_map, regdev_default_ofw_map),
|
||||
|
||||
DEVMETHOD_END
|
||||
};
|
||||
|
||||
static driver_t gpioregulator_driver = {
|
||||
"gpioregulator",
|
||||
gpioregulator_methods,
|
||||
sizeof(struct gpioregulator_softc),
|
||||
};
|
||||
|
||||
static devclass_t gpioregulator_devclass;
|
||||
|
||||
EARLY_DRIVER_MODULE(gpioregulator, simplebus, gpioregulator_driver,
|
||||
gpioregulator_devclass, 0, 0, BUS_PASS_INTERRUPT + BUS_PASS_ORDER_LAST);
|
||||
MODULE_VERSION(gpioregulator, 1);
|
Loading…
Reference in New Issue
Block a user