73 lines
1.7 KiB
C
73 lines
1.7 KiB
C
/* Copyright 2012 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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#ifndef __CROS_EC_PWM_H
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#define __CROS_EC_PWM_H
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/* The values are defined in board.h */
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enum pwm_channel;
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/**
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* Enable/disable a PWM channel.
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*/
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void pwm_enable(enum pwm_channel ch, int enabled);
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/**
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* Get PWM channel enabled status.
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*/
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int pwm_get_enabled(enum pwm_channel ch);
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/**
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* Set PWM channel duty cycle (0-65535).
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*/
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void pwm_set_raw_duty(enum pwm_channel ch, uint16_t duty);
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/**
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* Get PWM channel duty cycle.
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*/
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uint16_t pwm_get_raw_duty(enum pwm_channel ch);
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/**
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* Set PWM channel duty cycle (0-100).
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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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* Get PWM channel duty cycle.
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*/
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int pwm_get_duty(enum pwm_channel ch);
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/* Flags for PWM config table */
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/**
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* PWM output signal is inverted, so 100% duty means always low
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*/
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#define PWM_CONFIG_ACTIVE_LOW BIT(0)
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/**
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* PWM channel has a fan controller with a tach input and can auto-adjust
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* its duty cycle to produce a given fan RPM.
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*/
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#define PWM_CONFIG_HAS_RPM_MODE BIT(1)
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/**
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* PWM clock select alternate source. The actual clock and alternate
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* source are chip dependent.
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*/
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#define PWM_CONFIG_ALT_CLOCK BIT(2)
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/**
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* PWM channel has a complementary output signal which should be enabled in
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* addition to the primary output.
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*/
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#define PWM_CONFIG_COMPLEMENTARY_OUTPUT BIT(3)
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/**
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* PWM channel must stay active in low-power idle, if enabled.
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*/
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#define PWM_CONFIG_DSLEEP BIT(4)
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/**
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* PWM channel's IO type is open-drain, if enabled. (default IO is push-pull.)
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*/
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#define PWM_CONFIG_OPEN_DRAIN BIT(5)
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#endif /* __CROS_EC_PWM_H */
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