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3d4bb5f649
gru has circuitrythat selects the charge LED color based on the frequency of the PWM. By adjusting the PWM frequency instead of just the duty, we gain more control over the brightness of the charge LED. BUG=chrome-os-partner:54155 BRANCH=gru TEST=activate each LED in turn and confirm color and brightness Change-Id: Ie653125a528595c1ec68aea4d02cb70595a1b151 Signed-off-by: David Schneider <dnschneid@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/415517 Reviewed-by: Shawn N <shawnn@chromium.org>
75 lines
1.7 KiB
C
75 lines
1.7 KiB
C
/* Copyright (c) 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 frequency (Hz).
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* PWM will be disabled until the duty is set.
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*/
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void pwm_set_freq(enum pwm_channel ch, uint32_t freq);
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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 (1 << 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 (1 << 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 (1 << 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 (1 << 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 (1 << 4)
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#endif /* __CROS_EC_PWM_H */
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