blob: d888a5fd6dcc46c08028c0d28246ff65ccc6123e [file] [log] [blame]
/*
* Copyright 2023 EPAM Systems
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT regulator_gpio
#include <stdint.h>
#include <zephyr/drivers/regulator.h>
#include <zephyr/drivers/gpio.h>
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(regulator_gpio, CONFIG_REGULATOR_LOG_LEVEL);
struct regulator_gpio_config {
struct regulator_common_config common;
const struct gpio_dt_spec *gpios;
uint8_t num_gpios;
const int32_t *states;
uint8_t states_cnt;
const struct gpio_dt_spec enable;
};
struct regulator_gpio_data {
struct regulator_common_data common;
int32_t current_volt_uv;
};
static int regulator_gpio_apply_state(const struct device *dev, uint32_t state)
{
const struct regulator_gpio_config *cfg = dev->config;
for (unsigned int gpio_idx = 0; gpio_idx < cfg->num_gpios; gpio_idx++) {
int ret;
int new_state_of_gpio = (state >> gpio_idx) & 0x1;
ret = gpio_pin_get_dt(&cfg->gpios[gpio_idx]);
if (ret < 0) {
LOG_ERR("%s: can't get pin state", dev->name);
return ret;
}
if (ret != new_state_of_gpio) {
ret = gpio_pin_set_dt(&cfg->gpios[gpio_idx], new_state_of_gpio);
if (ret < 0) {
LOG_ERR("%s: can't set pin state", dev->name);
return ret;
}
}
}
return 0;
}
static int regulator_gpio_enable(const struct device *dev)
{
const struct regulator_gpio_config *cfg = dev->config;
int ret;
if (cfg->enable.port == NULL) {
return 0;
}
ret = gpio_pin_set_dt(&cfg->enable, 1);
if (ret < 0) {
LOG_ERR("%s: can't enable regulator!", dev->name);
return ret;
}
return 0;
}
static int regulator_gpio_disable(const struct device *dev)
{
const struct regulator_gpio_config *cfg = dev->config;
if (cfg->enable.port == NULL) {
return 0;
}
return gpio_pin_set_dt(&cfg->enable, 0);
}
static unsigned int regulator_gpio_count_voltages(const struct device *dev)
{
const struct regulator_gpio_config *cfg = dev->config;
return cfg->states_cnt;
}
static int regulator_gpio_list_voltage(const struct device *dev, unsigned int idx, int32_t *volt_uv)
{
const struct regulator_gpio_config *cfg = dev->config;
if (idx >= cfg->states_cnt) {
LOG_ERR("%s: can't get list voltage for idx %u", dev->name, idx);
return -EINVAL;
}
*volt_uv = cfg->states[idx * 2];
return 0;
}
static int regulator_gpio_set_voltage(const struct device *dev, int32_t min_uv, int32_t max_uv)
{
const struct regulator_gpio_config *cfg = dev->config;
struct regulator_gpio_data *data = dev->data;
int32_t best_voltage = INT32_MAX;
unsigned int best_state;
int ret = 0;
/* choose minimum possible voltage in range provided by a caller */
for (unsigned int state_idx = 0; state_idx < cfg->states_cnt; state_idx++) {
if (!IN_RANGE(cfg->states[state_idx * 2], min_uv, max_uv) ||
cfg->states[state_idx * 2] >= best_voltage) {
continue;
}
best_voltage = cfg->states[state_idx * 2];
best_state = cfg->states[state_idx * 2 + 1];
}
if (best_voltage == INT32_MAX) {
LOG_ERR("%s: can't find voltage is states", dev->name);
return -EINVAL;
}
if (best_voltage == data->current_volt_uv) {
return 0;
}
ret = regulator_gpio_apply_state(dev, best_state);
if (ret) {
return ret;
}
data->current_volt_uv = best_voltage;
return 0;
}
static int regulator_gpio_get_voltage(const struct device *dev, int32_t *volt_uv)
{
const struct regulator_gpio_data *data = dev->data;
*volt_uv = data->current_volt_uv;
return 0;
}
static const struct regulator_driver_api regulator_gpio_api = {
.enable = regulator_gpio_enable,
.disable = regulator_gpio_disable,
.set_voltage = regulator_gpio_set_voltage,
.get_voltage = regulator_gpio_get_voltage,
.count_voltages = regulator_gpio_count_voltages,
.list_voltage = regulator_gpio_list_voltage,
};
static int regulator_gpio_init(const struct device *dev)
{
const struct regulator_gpio_config *cfg = dev->config;
int ret;
regulator_common_data_init(dev);
for (unsigned int gpio_idx = 0; gpio_idx < cfg->num_gpios; gpio_idx++) {
if (!gpio_is_ready_dt(&cfg->gpios[gpio_idx])) {
LOG_ERR("%s: gpio pin: %s not ready", dev->name,
cfg->gpios[gpio_idx].port ? cfg->gpios[gpio_idx].port->name
: "null");
return -ENODEV;
}
ret = gpio_pin_configure_dt(&cfg->gpios[gpio_idx], GPIO_OUTPUT);
if (ret < 0) {
LOG_ERR("%s: can't configure pin (%d) as output", dev->name,
cfg->gpios[gpio_idx].pin);
return ret;
}
}
if (cfg->enable.port != NULL) {
if (!gpio_is_ready_dt(&cfg->enable)) {
LOG_ERR("%s: gpio pin: %s not ready", dev->name, cfg->enable.port->name);
return -ENODEV;
}
ret = gpio_pin_configure_dt(&cfg->enable, GPIO_OUTPUT | GPIO_OUTPUT_INIT_LOW);
if (ret < 0) {
LOG_ERR("%s: can't configure enable pin (%d) as output", dev->name,
cfg->enable.pin);
return ret;
}
}
return regulator_common_init(dev, false);
}
#define REG_GPIO_CONTEXT_GPIOS_SPEC_ELEM(_node_id, _prop, _idx) \
GPIO_DT_SPEC_GET_BY_IDX(_node_id, _prop, _idx),
#define REG_GPIO_CONTEXT_GPIOS_FOREACH_ELEM(inst) \
DT_FOREACH_PROP_ELEM(DT_DRV_INST(inst), gpios, REG_GPIO_CONTEXT_GPIOS_SPEC_ELEM)
#define REG_GPIO_CONTEXT_GPIOS_INITIALIZE(inst) \
.gpios = (const struct gpio_dt_spec[]){REG_GPIO_CONTEXT_GPIOS_FOREACH_ELEM(inst)}, \
.num_gpios = DT_INST_PROP_LEN(inst, gpios)
#define REGULATOR_GPIO_DEFINE(inst) \
static struct regulator_gpio_data data##inst = { \
.current_volt_uv = INT32_MAX, \
}; \
BUILD_ASSERT(!(DT_INST_PROP_LEN(inst, states) & 0x1), \
"Number of regulator states should be even"); \
static const struct regulator_gpio_config config##inst = { \
.common = REGULATOR_DT_INST_COMMON_CONFIG_INIT(inst), \
REG_GPIO_CONTEXT_GPIOS_INITIALIZE(inst), \
.enable = GPIO_DT_SPEC_INST_GET_OR(inst, enable_gpios, {0}), \
.states = ((const int[])DT_INST_PROP(inst, states)), \
.states_cnt = DT_INST_PROP_LEN(inst, states) / 2, \
}; \
DEVICE_DT_INST_DEFINE(inst, regulator_gpio_init, NULL, &data##inst, &config##inst, \
POST_KERNEL, CONFIG_REGULATOR_GPIO_INIT_PRIORITY, \
&regulator_gpio_api);
DT_INST_FOREACH_STATUS_OKAY(REGULATOR_GPIO_DEFINE)