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/* Copyright 2022 The ChromiumOS Authors
* 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_displight
#include "common.h"
#include "util.h"
#include <zephyr/devicetree.h>
#include <zephyr/drivers/pwm.h>
#include <zephyr/logging/log.h>
#include <drivers/cros_displight.h>
LOG_MODULE_REGISTER(displight, LOG_LEVEL_ERR);
BUILD_ASSERT(DT_NUM_INST_STATUS_OKAY(DT_DRV_COMPAT) == 1,
"Exactly one instance of cros-ec,displight should be defined.");
static const struct pwm_dt_spec displight_pwm = PWM_DT_SPEC_INST_GET(0);
static int displight_percent;
static void displight_set_duty(int percent)
{
const struct device *pwm_dev = displight_pwm.dev;
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(displight_pwm.period * percent, 100);
LOG_DBG("displight PWM %s set percent (%d), pulse %d", pwm_dev->name,
percent, pulse_ns);
rv = pwm_set_pulse_dt(&displight_pwm, pulse_ns);
if (rv) {
LOG_ERR("pwm_set_pulse_dt failed %s (%d)", pwm_dev->name, rv);
}
}
int displight_set(int percent)
{
displight_percent = percent;
displight_set_duty(percent);
return EC_SUCCESS;
}
int displight_get(void)
{
return displight_percent;
}
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