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079742b1ff
Previously enabling USB would automatically (using an init hook) initialize the USB peripheral. This would take over the GPIO lines assigned to the USB module. This is not OK on Ryu for Case Closed Debug because it interferes with the AP's access to the USB 2.0 lines even when not in Case Close Debug mode. This change adds a configuration option to inhibit this default initialization of the USB peripheral. It also renames the existing CONFIG_USB_INHIBIT to CONFIG_USB_INHIBIT_CONNECT now that there are two possible inhibitions. Signed-off-by: Anton Staaf <robotboy@chromium.org> BRANCH=None BUG=None TEST=make buildall -j Enable console on ryu_p2 and discovery-stm32f072 board Verify that it works on both Change-Id: I6734357131b4356e3d4164349d6c74deac196ce5 Reviewed-on: https://chromium-review.googlesource.com/229138 Reviewed-by: Vincent Palatin <vpalatin@chromium.org> Commit-Queue: Anton Staaf <robotboy@chromium.org> Tested-by: Anton Staaf <robotboy@chromium.org>
43 lines
1.3 KiB
C
43 lines
1.3 KiB
C
/* Copyright (c) 2014 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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* USB API definitions.
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*
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* This file includes definitions needed by common code that wants to control
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* the state of the USB peripheral, but doesn't need to know about the specific
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* implementation.
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*/
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#ifndef USB_API_H
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#define USB_API_H
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/*
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* Initialize the USB peripheral, enabling its clock and configuring the DP/DN
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* GPIOs correctly. This function is called via an init hook (unless the board
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* defined CONFIG_USB_INHIBIT_INIT), but may need to be called again if
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* usb_release is called. This function will call usb_connect by default
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* unless CONFIG_USB_INHIBIT_CONNECT is defined.
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*/
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void usb_init(void);
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/*
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* Enable the pullup on the DP line to signal that this device exists to the
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* host and to start the enumeration process.
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*/
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void usb_connect(void);
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/*
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* Disable the pullup on the DP line. This causes the device to be disconnected
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* from the host.
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*/
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void usb_disconnect(void);
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/*
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* Disconnect from the host by calling usb_disconnect and then turn off the USB
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* peripheral, releasing its GPIOs and disabling its clock.
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*/
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void usb_release(void);
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#endif /* USB_API_H */
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