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USB: otg: gpio_vbus transceiver stub

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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>
This commit is contained in:
Philipp Zabel 2008-11-24 12:00:01 -08:00 • committed by Greg Kroah-Hartman
parent b8da8677d4
commit 6084f1bf0c
4 changed files with 383 additions and 0 deletions
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30
include/linux/usb/gpio_vbus.h Normal file
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/*
* A simple GPIO VBUS sensing driver for B peripheral only devices
* with internal transceivers.
* Optionally D+ pullup can be controlled by a second GPIO.
*
* Copyright (c) 2008 Philipp Zabel <philipp.zabel@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
/**
* struct gpio_vbus_mach_info - configuration for gpio_vbus
* @gpio_vbus: VBUS sensing GPIO
* @gpio_pullup: optional D+ or D- pullup GPIO (else negative/invalid)
* @gpio_vbus_inverted: true if gpio_vbus is active low
* @gpio_pullup_inverted: true if gpio_pullup is active low
*
* The VBUS sensing GPIO should have a pulldown, which will normally be
* part of a resistor ladder turning a 4.0V-5.25V level on VBUS into a
* value the GPIO detects as active. Some systems will use comparators.
*/
struct gpio_vbus_mach_info {
int gpio_vbus;
int gpio_pullup;
bool gpio_vbus_inverted;
bool gpio_pullup_inverted;
};