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6084f1bf0c
gpio_vbus provides simple GPIO VBUS sensing for peripheral controllers with an internal transceiver. Optionally, a second GPIO can be used to control D+ pullup. It also interfaces with the regulator framework to limit charging currents when powered via USB. gpio_vbus requests the regulator supplying "vbus_draw" and can enable/disable it or limit its current depending on USB state. [dbrownell@users.sourceforge.net: use drivers/otg, cleanups ] Signed-off-by: Philipp Zabel <philipp.zabel@gmail.com> Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
31 lines
1.0 KiB
C
31 lines
1.0 KiB
C
/*
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* A simple GPIO VBUS sensing driver for B peripheral only devices
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* with internal transceivers.
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* Optionally D+ pullup can be controlled by a second GPIO.
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*
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* Copyright (c) 2008 Philipp Zabel <philipp.zabel@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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/**
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* struct gpio_vbus_mach_info - configuration for gpio_vbus
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* @gpio_vbus: VBUS sensing GPIO
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* @gpio_pullup: optional D+ or D- pullup GPIO (else negative/invalid)
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* @gpio_vbus_inverted: true if gpio_vbus is active low
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* @gpio_pullup_inverted: true if gpio_pullup is active low
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*
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* The VBUS sensing GPIO should have a pulldown, which will normally be
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* part of a resistor ladder turning a 4.0V-5.25V level on VBUS into a
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* value the GPIO detects as active. Some systems will use comparators.
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*/
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struct gpio_vbus_mach_info {
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int gpio_vbus;
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int gpio_pullup;
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bool gpio_vbus_inverted;
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bool gpio_pullup_inverted;
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};
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