71 lines
1.6 KiB
C
71 lines
1.6 KiB
C
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/* Copyright 2013 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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/* PWM control module for LM4.
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*
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* On this chip, the PWM logic is implemented by the hardware FAN modules.
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*/
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#include "clock.h"
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#include "fan.h"
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#include "gpio.h"
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#include "hooks.h"
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#include "pwm.h"
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#include "pwm_chip.h"
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#include "registers.h"
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#include "util.h"
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void pwm_enable(enum pwm_channel ch, int enabled)
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{
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fan_set_enabled(pwm_channels[ch].channel, enabled);
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}
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int pwm_get_enabled(enum pwm_channel ch)
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{
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return fan_get_enabled(pwm_channels[ch].channel);
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}
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void pwm_set_duty(enum pwm_channel ch, int percent)
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{
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if (percent < 0)
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percent = 0;
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else if (percent > 100)
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percent = 100;
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/* Assume the fan control is active high and invert it ourselves */
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if (pwm_channels[ch].flags & PWM_CONFIG_ACTIVE_LOW)
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percent = 100 - percent;
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/* Always enable the channel */
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pwm_enable(ch, 1);
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/* Set the duty cycle */
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fan_set_duty(pwm_channels[ch].channel, percent);
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}
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int pwm_get_duty(enum pwm_channel ch)
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{
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int percent = fan_get_duty(pwm_channels[ch].channel);
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if (pwm_channels[ch].flags & PWM_CONFIG_ACTIVE_LOW)
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percent = 100 - percent;
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return percent;
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}
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static void pwm_init(void)
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{
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int i;
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for (i = 0; i < PWM_CH_COUNT; ++i)
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fan_channel_setup(pwm_channels[i].channel,
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(pwm_channels[i].flags &
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PWM_CONFIG_HAS_RPM_MODE)
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? FAN_USE_RPM_MODE : 0);
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}
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/* The chip-specific fan module initializes before this. */
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DECLARE_HOOK(HOOK_INIT, pwm_init, HOOK_PRIO_INIT_PWM);
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