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99c186b701
Allow boards to customize both the PWM frequency / period and the enabling of complementary output signals. BUG=chrome-os-partner:48044 TEST=Manual with snoball w/ subsequent commit. Run `pwm <ch> 50` for each channel, verify with `adc` that each PD output voltage is approximately VBUCK / 2. BRANCH=None Change-Id: I61cbb4a5b656f41ec7cec59339f5247902256295 Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/315141 Commit-Ready: Shawn N <shawnn@chromium.org> Tested-by: Shawn N <shawnn@chromium.org> Reviewed-by: Alec Berg <alecaberg@chromium.org> Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
56 lines
1.3 KiB
C
56 lines
1.3 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 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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#endif /* __CROS_EC_PWM_H */
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