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/*
* Copyright (c) 2020 The ZMK Contributors
*
* SPDX-License-Identifier: MIT
*/
#define DT_DRV_COMPAT zmk_ext_power_generic
#include <stdio.h>
#include <device.h>
#include <init.h>
#include <kernel.h>
#include <settings/settings.h>
#include <drivers/gpio.h>
#include <drivers/ext_power.h>
#if DT_HAS_COMPAT_STATUS_OKAY(DT_DRV_COMPAT)
#include <logging/log.h>
LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);
struct ext_power_generic_config {
const char *label;
const uint8_t pin;
const uint8_t flags;
const uint16_t init_delay_ms;
};
struct ext_power_generic_data {
const struct device *gpio;
bool status;
#if IS_ENABLED(CONFIG_SETTINGS)
bool settings_init;
#endif
#ifdef CONFIG_PM_DEVICE
uint32_t pm_state;
#endif
};
#if IS_ENABLED(CONFIG_SETTINGS)
static void ext_power_save_state_work(struct k_work *work) {
char setting_path[40];
const struct device *ext_power = device_get_binding(DT_INST_LABEL(0));
struct ext_power_generic_data *data = ext_power->data;
snprintf(setting_path, 40, "ext_power/state/%s", DT_INST_LABEL(0));
settings_save_one(setting_path, &data->status, sizeof(data->status));
}
static struct k_delayed_work ext_power_save_work;
#endif
int ext_power_save_state() {
#if IS_ENABLED(CONFIG_SETTINGS)
k_delayed_work_cancel(&ext_power_save_work);
return k_delayed_work_submit(&ext_power_save_work, K_MSEC(CONFIG_ZMK_SETTINGS_SAVE_DEBOUNCE));
#else
return 0;
#endif
}
static int ext_power_generic_enable(const struct device *dev) {
struct ext_power_generic_data *data = dev->data;
const struct ext_power_generic_config *config = dev->config;
if (gpio_pin_set(data->gpio, config->pin, 1)) {
LOG_WRN("Failed to set ext-power control pin");
return -EIO;
}
data->status = true;
return ext_power_save_state();
}
static int ext_power_generic_disable(const struct device *dev) {
struct ext_power_generic_data *data = dev->data;
const struct ext_power_generic_config *config = dev->config;
if (gpio_pin_set(data->gpio, config->pin, 0)) {
LOG_WRN("Failed to clear ext-power control pin");
return -EIO;
}
data->status = false;
return ext_power_save_state();
}
static int ext_power_generic_get(const struct device *dev) {
struct ext_power_generic_data *data = dev->data;
return data->status;
}
#if IS_ENABLED(CONFIG_SETTINGS)
static int ext_power_settings_set(const char *name, size_t len, settings_read_cb read_cb,
void *cb_arg) {
const char *next;
int rc;
if (settings_name_steq(name, DT_INST_LABEL(0), &next) && !next) {
const struct device *ext_power = device_get_binding(DT_INST_LABEL(0));
struct ext_power_generic_data *data = ext_power->data;
if (len != sizeof(data->status)) {
return -EINVAL;
}
rc = read_cb(cb_arg, &data->status, sizeof(data->status));
if (rc >= 0) {
data->settings_init = true;
if (ext_power == NULL) {
LOG_ERR("Unable to retrieve ext_power device: %s", DT_INST_LABEL(0));
return -EIO;
}
if (data->status) {
ext_power_generic_enable(ext_power);
} else {
ext_power_generic_disable(ext_power);
}
return 0;
}
return rc;
}
return -ENOENT;
}
struct settings_handler ext_power_conf = {.name = "ext_power/state",
.h_set = ext_power_settings_set};
#endif
static int ext_power_generic_init(const struct device *dev) {
struct ext_power_generic_data *data = dev->data;
const struct ext_power_generic_config *config = dev->config;
data->gpio = device_get_binding(config->label);
if (data->gpio == NULL) {
LOG_ERR("Failed to get ext-power control device");
return -EINVAL;
}
if (gpio_pin_configure(data->gpio, config->pin, config->flags | GPIO_OUTPUT)) {
LOG_ERR("Failed to configure ext-power control pin");
return -EIO;
}
#ifdef CONFIG_PM_DEVICE
data->pm_state = DEVICE_PM_ACTIVE_STATE;
#endif
#if IS_ENABLED(CONFIG_SETTINGS)
settings_subsys_init();
int err = settings_register(&ext_power_conf);
if (err) {
LOG_ERR("Failed to register the ext_power settings handler (err %d)", err);
return err;
}
k_delayed_work_init(&ext_power_save_work, ext_power_save_state_work);
// Set default value (on) if settings isn't set
settings_load_subtree("ext_power");
if (!data->settings_init) {
data->status = true;
k_delayed_work_submit(&ext_power_save_work, K_NO_WAIT);
ext_power_enable(dev);
}
#else
// Default to the ext_power being open when no settings
ext_power_enable(dev);
#endif
if (config->init_delay_ms) {
k_msleep(config->init_delay_ms);
}
return 0;
}
#ifdef CONFIG_PM_DEVICE
static int ext_power_generic_pm_control(const struct device *dev, uint32_t ctrl_command,
void *context, device_pm_cb cb, void *arg) {
int rc;
struct ext_power_generic_data *data = dev->data;
switch (ctrl_command) {
case DEVICE_PM_SET_POWER_STATE:
if (*((uint32_t *)context) == DEVICE_PM_ACTIVE_STATE) {
data->pm_state = DEVICE_PM_ACTIVE_STATE;
rc = 0;
} else {
ext_power_generic_disable(dev);
data->pm_state = DEVICE_PM_LOW_POWER_STATE;
rc = 0;
}
break;
case DEVICE_PM_GET_POWER_STATE:
*((uint32_t *)context) = data->pm_state;
rc = 0;
break;
default:
rc = -EINVAL;
}
if (cb != NULL) {
cb(dev, rc, context, arg);
}
return rc;
}
#endif /* CONFIG_PM_DEVICE */
static const struct ext_power_generic_config config = {
.label = DT_INST_GPIO_LABEL(0, control_gpios),
.pin = DT_INST_GPIO_PIN(0, control_gpios),
.flags = DT_INST_GPIO_FLAGS(0, control_gpios),
.init_delay_ms = DT_INST_PROP_OR(0, init_delay_ms, 0)};
static struct ext_power_generic_data data = {
.status = false,
#if IS_ENABLED(CONFIG_SETTINGS)
.settings_init = false,
#endif
};
static const struct ext_power_api api = {.enable = ext_power_generic_enable,
.disable = ext_power_generic_disable,
.get = ext_power_generic_get};
#define ZMK_EXT_POWER_INIT_PRIORITY 81
DEVICE_DT_INST_DEFINE(0, ext_power_generic_init, &ext_power_generic_pm_control, &data, &config,
POST_KERNEL, ZMK_EXT_POWER_INIT_PRIORITY, &api);
#endif /* DT_HAS_COMPAT_STATUS_OKAY(DT_DRV_COMPAT) */
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