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/*
* Copyright (c) 2021 The ZMK Contributors
*
* SPDX-License-Identifier: MIT
*/
#include <device.h>
#include <devicetree.h>
#include <init.h>
#include <kernel.h>
#include <drivers/led.h>
#include <logging/log.h>
#include <settings/settings.h>
#include <zmk/activity.h>
#include <zmk/backlight.h>
#include <zmk/usb.h>
#include <zmk/event_manager.h>
#include <zmk/events/activity_state_changed.h>
#include <zmk/events/usb_conn_state_changed.h>
LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);
BUILD_ASSERT(DT_HAS_CHOSEN(zmk_backlight),
"CONFIG_ZMK_BACKLIGHT is enabled but no zmk,backlight chosen node found");
static const struct device *const backlight_dev = DEVICE_DT_GET(DT_CHOSEN(zmk_backlight));
#define CHILD_COUNT(...) +1
#define DT_NUM_CHILD(node_id) (DT_FOREACH_CHILD(node_id, CHILD_COUNT))
#define BACKLIGHT_NUM_LEDS (DT_NUM_CHILD(DT_CHOSEN(zmk_backlight)))
struct backlight_state {
uint8_t brightness;
bool on;
};
static struct backlight_state state = {.brightness = CONFIG_ZMK_BACKLIGHT_BRT_START,
.on = IS_ENABLED(CONFIG_ZMK_BACKLIGHT_ON_START)};
static int zmk_backlight_update() {
uint8_t brt = state.on ? state.brightness : 0;
for (int i = 0; i < BACKLIGHT_NUM_LEDS; i++) {
int rc = led_set_brightness(backlight_dev, i, brt);
if (rc != 0) {
return rc;
}
}
return 0;
}
#if IS_ENABLED(CONFIG_SETTINGS)
static int backlight_settings_set(const char *name, size_t len, settings_read_cb read_cb,
void *cb_arg) {
const char *next;
if (settings_name_steq(name, "state", &next) && !next) {
if (len != sizeof(state)) {
return -EINVAL;
}
int rc = read_cb(cb_arg, &state, sizeof(state));
if (rc < 0) {
return rc;
}
return zmk_backlight_update();
}
return -ENOENT;
}
static struct settings_handler backlight_conf = {.name = "backlight",
.h_set = backlight_settings_set};
static void zmk_backlight_save_state_work() {
settings_save_one("backlight/state", &state, sizeof(state));
}
static struct k_delayed_work backlight_save_work;
#endif // IS_ENABLED(CONFIG_SETTINGS)
static int zmk_backlight_save_state() {
#if IS_ENABLED(CONFIG_SETTINGS)
k_delayed_work_cancel(&backlight_save_work);
return k_delayed_work_submit(&backlight_save_work, K_MSEC(CONFIG_ZMK_SETTINGS_SAVE_DEBOUNCE));
#else
return 0;
#endif
}
static int zmk_backlight_init(const struct device *_arg) {
if (!device_is_ready(backlight_dev)) {
LOG_ERR("Backlight device \"%s\" is not ready", backlight_dev->name);
return -ENODEV;
}
#if IS_ENABLED(CONFIG_SETTINGS)
settings_subsys_init();
int err = settings_register(&backlight_conf);
if (err) {
LOG_ERR("Failed to register the backlight settings handler (err %d)", err);
return err;
}
k_delayed_work_init(&backlight_save_work, zmk_backlight_save_state_work);
settings_load_subtree("backlight");
#endif
return zmk_backlight_update();
}
int zmk_backlight_set_on(bool on) {
if (!state.on && state.brightness == 0) {
state.brightness = CONFIG_ZMK_BACKLIGHT_BRT_STEP;
}
state.on = on;
int rc = zmk_backlight_update();
if (rc != 0) {
return rc;
}
return zmk_backlight_save_state();
}
bool zmk_backlight_is_on() { return state.on; }
int zmk_backlight_set_brt(int brt) {
state.on = (brt > 0);
state.brightness = CLAMP(brt, 0, 100);
int rc = zmk_backlight_update();
if (rc != 0) {
return rc;
}
return zmk_backlight_save_state();
}
int zmk_backlight_get_brt() { return state.on ? state.brightness : 0; }
int zmk_backlight_toggle() { return zmk_backlight_set_on(!state.on); }
int zmk_backlight_on() { return zmk_backlight_set_on(true); }
int zmk_backlight_off() { return zmk_backlight_set_on(false); }
int zmk_backlight_inc() {
if (!state.on) {
return zmk_backlight_set_brt(MAX(state.brightness, CONFIG_ZMK_BACKLIGHT_BRT_STEP));
}
return zmk_backlight_set_brt(state.brightness + CONFIG_ZMK_BACKLIGHT_BRT_STEP);
}
int zmk_backlight_dec() {
return zmk_backlight_set_brt(state.brightness - CONFIG_ZMK_BACKLIGHT_BRT_STEP);
}
#if IS_ENABLED(CONFIG_ZMK_BACKLIGHT_AUTO_OFF_IDLE)
static bool auto_off_idle_prev_state = false;
#endif
#if IS_ENABLED(CONFIG_ZMK_BACKLIGHT_AUTO_OFF_USB)
static bool auto_off_usb_prev_state = false;
#endif
#if IS_ENABLED(CONFIG_ZMK_BACKLIGHT_AUTO_OFF_IDLE) || IS_ENABLED(CONFIG_ZMK_BACKLIGHT_AUTO_OFF_USB)
static int backlight_event_listener(const zmk_event_t *eh) {
#if IS_ENABLED(CONFIG_ZMK_BACKLIGHT_AUTO_OFF_IDLE)
if (as_zmk_activity_state_changed(eh)) {
bool new_state = (zmk_activity_get_state() == ZMK_ACTIVITY_ACTIVE);
if (state.on == new_state) {
return 0;
}
if (new_state) {
state.on = auto_off_idle_prev_state;
auto_off_idle_prev_state = false;
} else {
state.on = false;
auto_off_idle_prev_state = true;
}
return zmk_backlight_update();
}
#endif
#if IS_ENABLED(CONFIG_ZMK_BACKLIGHT_AUTO_OFF_USB)
if (as_zmk_usb_conn_state_changed(eh)) {
bool new_state = zmk_usb_is_powered();
if (state.on == new_state) {
return 0;
}
if (new_state) {
state.on = auto_off_usb_prev_state;
auto_off_usb_prev_state = false;
} else {
state.on = false;
auto_off_usb_prev_state = true;
}
return zmk_backlight_update();
}
#endif
return -ENOTSUP;
}
ZMK_LISTENER(backlight, backlight_event_listener);
#endif // IS_ENABLED(CONFIG_ZMK_BACKLIGHT_AUTO_OFF_IDLE) ||
// IS_ENABLED(CONFIG_ZMK_BACKLIGHT_AUTO_OFF_USB)
#if IS_ENABLED(CONFIG_ZMK_BACKLIGHT_AUTO_OFF_IDLE)
ZMK_SUBSCRIPTION(backlight, zmk_activity_state_changed);
#endif
#if IS_ENABLED(CONFIG_ZMK_BACKLIGHT_AUTO_OFF_USB)
ZMK_SUBSCRIPTION(backlight, zmk_usb_conn_state_changed);
#endif
SYS_INIT(zmk_backlight_init, APPLICATION, CONFIG_APPLICATION_INIT_PRIORITY);
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