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/* Copyright 2021 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "common.h"
#include "compile_time_macros.h"
#include "hooks.h"
#include "pwm.h"
#include "pwm_chip.h"
const struct pwm_t pwm_channels[] = {
[PWM_CH_KBLIGHT] = {
.channel = 3,
.flags = 0,
/*
* Set PWM frequency to multiple of 50 Hz and 60 Hz to prevent
* flicker. Higher frequencies consume similar average power to
* lower PWM frequencies, but higher frequencies record a much
* lower maximum power.
*/
.freq = 25000,
},
[PWM_CH_FAN] = {
.channel = 5,
.flags = PWM_CONFIG_OPEN_DRAIN,
.freq = 25000
},
};
BUILD_ASSERT(ARRAY_SIZE(pwm_channels) == PWM_CH_COUNT);
static void board_pwm_init(void)
{
/*
* Turn on the fan at 50%.
*/
pwm_enable(PWM_CH_KBLIGHT, 1);
pwm_set_duty(PWM_CH_KBLIGHT, 50);
}
DECLARE_HOOK(HOOK_INIT, board_pwm_init, HOOK_PRIO_DEFAULT);
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