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/*
* Copyright (c) 2021 The ZMK Contributors
*
* SPDX-License-Identifier: MIT
*/
#include <zephyr/device.h>
#include <zephyr/devicetree.h>
#include <zephyr/drivers/led.h>
#include <zephyr/init.h>
#include <zephyr/kernel.h>
#include <zephyr/logging/log.h>
#include <zephyr/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)))
#define BRT_MAX 100
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(void) {
uint8_t brt = zmk_backlight_get_brt();
LOG_DBG("Update backlight brightness: %d%%", brt);
for (int i = 0; i < BACKLIGHT_NUM_LEDS; i++) {
int rc = led_set_brightness(backlight_dev, i, brt);
if (rc != 0) {
LOG_ERR("Failed to update backlight LED %d: %d", i, rc);
return rc;
}
}
return 0;
}
#if IS_ENABLED(CONFIG_SETTINGS)
static int backlight_settings_load_cb(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) {
rc = zmk_backlight_update();
}
return MIN(rc, 0);
}
return -ENOENT;
}
SETTINGS_STATIC_HANDLER_DEFINE(backlight, "backlight", NULL, backlight_settings_load_cb, NULL,
NULL);
static void backlight_save_work_handler(struct k_work *work) {
settings_save_one("backlight/state", &state, sizeof(state));
}
static struct k_work_delayable backlight_save_work;
#endif
static int zmk_backlight_init(void) {
if (!device_is_ready(backlight_dev)) {
LOG_ERR("Backlight device \"%s\" is not ready", backlight_dev->name);
return -ENODEV;
}
#if IS_ENABLED(CONFIG_SETTINGS)
k_work_init_delayable(&backlight_save_work, backlight_save_work_handler);
#endif
#if IS_ENABLED(CONFIG_ZMK_BACKLIGHT_AUTO_OFF_USB)
state.on = zmk_usb_is_powered();
#endif
return zmk_backlight_update();
}
static int zmk_backlight_update_and_save(void) {
int rc = zmk_backlight_update();
if (rc != 0) {
return rc;
}
#if IS_ENABLED(CONFIG_SETTINGS)
int ret = k_work_reschedule(&backlight_save_work, K_MSEC(CONFIG_ZMK_SETTINGS_SAVE_DEBOUNCE));
return MIN(ret, 0);
#else
return 0;
#endif
}
int zmk_backlight_on(void) {
state.brightness = MAX(state.brightness, CONFIG_ZMK_BACKLIGHT_BRT_STEP);
state.on = true;
return zmk_backlight_update_and_save();
}
int zmk_backlight_off(void) {
state.on = false;
return zmk_backlight_update_and_save();
}
int zmk_backlight_toggle(void) { return state.on ? zmk_backlight_off() : zmk_backlight_on(); }
bool zmk_backlight_is_on(void) { return state.on; }
int zmk_backlight_set_brt(uint8_t brightness) {
state.brightness = MIN(brightness, BRT_MAX);
state.on = (state.brightness > 0);
return zmk_backlight_update_and_save();
}
uint8_t zmk_backlight_get_brt(void) { return state.on ? state.brightness : 0; }
uint8_t zmk_backlight_calc_brt(int direction) {
int brt = state.brightness + (direction * CONFIG_ZMK_BACKLIGHT_BRT_STEP);
return CLAMP(brt, 0, BRT_MAX);
}
uint8_t zmk_backlight_calc_brt_cycle(void) {
if (state.brightness == BRT_MAX) {
return 0;
} else {
return zmk_backlight_calc_brt(1);
}
}
#if IS_ENABLED(CONFIG_ZMK_BACKLIGHT_AUTO_OFF_IDLE) || IS_ENABLED(CONFIG_ZMK_BACKLIGHT_AUTO_OFF_USB)
static int backlight_auto_state(bool *prev_state, bool new_state) {
if (state.on == new_state) {
return 0;
}
state.on = new_state && *prev_state;
*prev_state = !new_state;
return zmk_backlight_update();
}
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)) {
static bool prev_state = false;
return backlight_auto_state(&prev_state, zmk_activity_get_state() == ZMK_ACTIVITY_ACTIVE);
}
#endif
#if IS_ENABLED(CONFIG_ZMK_BACKLIGHT_AUTO_OFF_USB)
if (as_zmk_usb_conn_state_changed(eh)) {
static bool prev_state = false;
return backlight_auto_state(&prev_state, zmk_usb_is_powered());
}
#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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