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/* $OpenBSD: ofw_regulator.c,v 1.4 2017/12/18 09:13:47 kettenis Exp $ */
/*
* Copyright (c) 2016 Mark Kettenis
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_gpio.h>
#include <dev/ofw/ofw_pinctrl.h>
#include <dev/ofw/ofw_regulator.h>
LIST_HEAD(, regulator_device) regulator_devices =
LIST_HEAD_INITIALIZER(regulator_devices);
void
regulator_register(struct regulator_device *rd)
{
rd->rd_min = OF_getpropint(rd->rd_node, "regulator-min-microvolt", 0);
rd->rd_max = OF_getpropint(rd->rd_node, "regulator-max-microvolt", ~0);
KASSERT(rd->rd_min <= rd->rd_max);
if (rd->rd_get_voltage && rd->rd_set_voltage) {
uint32_t voltage = rd->rd_get_voltage(rd->rd_cookie);
if (voltage < rd->rd_min)
rd->rd_set_voltage(rd->rd_cookie, rd->rd_min);
if (voltage > rd->rd_max)
rd->rd_set_voltage(rd->rd_cookie, rd->rd_max);
}
rd->rd_phandle = OF_getpropint(rd->rd_node, "phandle", 0);
if (rd->rd_phandle == 0)
return;
LIST_INSERT_HEAD(®ulator_devices, rd, rd_list);
}
int
regulator_fixed_set(int node, int enable)
{
uint32_t *gpio;
uint32_t startup_delay;
int active;
int len;
pinctrl_byname(node, "default");
if (OF_getproplen(node, "enable-active-high") == 0)
active = 1;
else
active = 0;
/* The "gpio" property is optional. */
len = OF_getproplen(node, "gpio");
if (len < 0)
return 0;
gpio = malloc(len, M_TEMP, M_WAITOK);
OF_getpropintarray(node, "gpio", gpio, len);
gpio_controller_config_pin(gpio, GPIO_CONFIG_OUTPUT);
if (enable)
gpio_controller_set_pin(gpio, active);
else
gpio_controller_set_pin(gpio, !active);
free(gpio, M_TEMP, len);
startup_delay = OF_getpropint(node, "startup-delay-us", 0);
if (enable && startup_delay > 0)
delay(startup_delay);
return 0;
}
int
regulator_set(uint32_t phandle, int enable)
{
struct regulator_device *rd;
int node;
node = OF_getnodebyphandle(phandle);
if (node == 0)
return ENODEV;
/* Don't mess around with regulators that are always on. */
if (OF_getproplen(node, "regulator-always-on") == 0)
return 0;
LIST_FOREACH(rd, ®ulator_devices, rd_list) {
if (rd->rd_phandle == phandle)
break;
}
if (rd && rd->rd_enable)
return rd->rd_enable(rd->rd_cookie, enable);
if (OF_is_compatible(node, "regulator-fixed"))
return regulator_fixed_set(node, enable);
return ENODEV;
}
int
regulator_enable(uint32_t phandle)
{
return regulator_set(phandle, 1);
}
int
regulator_disable(uint32_t phandle)
{
return regulator_set(phandle, 0);
}
uint32_t
regulator_get_voltage(uint32_t phandle)
{
struct regulator_device *rd;
int node;
LIST_FOREACH(rd, ®ulator_devices, rd_list) {
if (rd->rd_phandle == phandle)
break;
}
if (rd && rd->rd_get_voltage)
return rd->rd_get_voltage(rd->rd_cookie);
node = OF_getnodebyphandle(phandle);
if (node == 0)
return 0;
if (OF_is_compatible(node, "regulator-fixed"))
return OF_getpropint(node, "regulator-min-voltage", 0);
return 0;
}
int
regulator_set_voltage(uint32_t phandle, uint32_t voltage)
{
struct regulator_device *rd;
LIST_FOREACH(rd, ®ulator_devices, rd_list) {
if (rd->rd_phandle == phandle)
break;
}
/* Check limits. */
if (rd && (voltage < rd->rd_min || voltage > rd->rd_max))
return EINVAL;
if (rd && rd->rd_set_voltage)
return rd->rd_set_voltage(rd->rd_cookie, voltage);
return ENODEV;
}
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