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/* Copyright 2022 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#define DT_DRV_COMPAT cros_ec_kblight_pwm
#include <zephyr/devicetree.h>
#include <zephyr/drivers/pwm.h>
#include <zephyr/logging/log.h>
#include "common.h"
#include "keyboard_backlight.h"
#include "util.h"
LOG_MODULE_REGISTER(kblight, LOG_LEVEL_ERR);
BUILD_ASSERT(DT_NUM_INST_STATUS_OKAY(DT_DRV_COMPAT) == 1,
"Exactly one instance of cros-ec,kblight-pwm should be defined.");
#define KBLIGHT_PWM_NODE DT_INST_PWMS_CTLR(0)
#define KBLIGHT_PWM_CHANNEL DT_INST_PWMS_CHANNEL(0)
#define KBLIGHT_PWM_FLAGS DT_INST_PWMS_FLAGS(0)
#define KBLIGHT_PWM_PERIOD_NS (NSEC_PER_SEC/DT_INST_PROP(0, frequency))
static bool kblight_enabled;
static int kblight_percent;
static void kblight_pwm_set_duty(int percent)
{
const struct device *pwm_dev = DEVICE_DT_GET(KBLIGHT_PWM_NODE);
uint32_t pulse_ns;
int rv;
if (!device_is_ready(pwm_dev)) {
LOG_ERR("PWM device %s not ready", pwm_dev->name);
return;
}
pulse_ns = DIV_ROUND_NEAREST(KBLIGHT_PWM_PERIOD_NS * percent, 100);
LOG_DBG("kblight PWM %s set percent (%d), pulse %d",
pwm_dev->name, percent, pulse_ns);
rv = pwm_set(pwm_dev, KBLIGHT_PWM_CHANNEL, KBLIGHT_PWM_PERIOD_NS,
pulse_ns, KBLIGHT_PWM_FLAGS);
if (rv) {
LOG_ERR("pwm_set() failed %s (%d)", pwm_dev->name, rv);
}
}
static int kblight_pwm_set(int percent)
{
kblight_percent = percent;
kblight_pwm_set_duty(percent);
return EC_SUCCESS;
}
static int kblight_pwm_get(void)
{
return kblight_percent;
}
static int kblight_pwm_enable(int enable)
{
kblight_enabled = enable;
if (enable) {
kblight_pwm_set_duty(kblight_percent);
} else {
/* Disable but hold kblight_percent. */
kblight_pwm_set_duty(0);
}
return EC_SUCCESS;
}
static int kblight_pwm_get_enabled(void)
{
return kblight_enabled;
}
static int kblight_pwm_init(void)
{
kblight_percent = 0;
kblight_pwm_enable(0);
return EC_SUCCESS;
}
const struct kblight_drv kblight_pwm = {
.init = kblight_pwm_init,
.set = kblight_pwm_set,
.get = kblight_pwm_get,
.enable = kblight_pwm_enable,
.get_enabled = kblight_pwm_get_enabled,
};
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