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USB host: Add device address management support in preparation for USB hub support
This commit is contained in:
Gregory Nutt
@@ -81,7 +81,7 @@ extern "C"
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*
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************************************************************************************/
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EXTERN int usbdev_serialinitialize(int minor);
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int usbdev_serialinitialize(int minor);
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#undef EXTERN
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#if defined(__cplusplus)
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@@ -0,0 +1,150 @@
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/*******************************************************************************
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* include/nuttx/usb/usbhost_devaddr.h
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* Manage USB device addresses
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*
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* Copyright (C) 2013 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* NOTE: This interface was inspired by the Linux gadget interface by
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* David Brownell. That work was very helpful in determining a usable
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* partitioning of functionality between standard class drivers and various
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* implementations of USB controller drivers. This work, however, does
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* not derive directly from that work and is licensed differently.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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*******************************************************************************/
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#ifndef _INCLUDE_NUTTX_USB_USBHOST_DEVADDR_H
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#define _INCLUDE_NUTTX_USB_USBHOST_DEVADDR_H
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/*******************************************************************************
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* Included Files
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*******************************************************************************/
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#include <nuttx/config.h>
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/*******************************************************************************
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* Pre-processor Definitions
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*******************************************************************************/
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/* Configuration ***************************************************************/
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#define USBHOST_DEVADDR_HASHSIZE 8
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#define USBHOST_DEVADDR_HASHMASK (USBHOST_DEVADDR_HASHSIZE-1)
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/*******************************************************************************
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* Public Types
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*******************************************************************************/
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struct usbhost_devhash_s
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{
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FAR struct usbhost_devhash_s *flink;
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FAR void *payload;
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uint8_t devaddr;
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};
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struct usbhost_devaddr_s
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{
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uint8_t next; /* Next device address */
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sem_t exclsem; /* Enforces mutulaly exlusive access */
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uint32_t alloctab[4]; /* Bit allocation table */
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/* Hash table */
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FAR struct usbhost_devhash_s *hashtab[USBHOST_DEVADDR_HASHSIZE];
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};
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/*******************************************************************************
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* Public Data
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*******************************************************************************/
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#undef EXTERN
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#if defined(__cplusplus)
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# define EXTERN extern "C"
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extern "C"
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{
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#else
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# define EXTERN extern
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#endif
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/*******************************************************************************
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* Public Functions
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*******************************************************************************/
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/*******************************************************************************
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* Name: usbhost_devaddr_initialize
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*
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* Description:
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* Initialize the caller provided struct usbhost_devaddr_s instance in
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* preparation for the management of device addresses on behalf of an HCD.
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*
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*******************************************************************************/
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void usbhost_devaddr_initialize(FAR struct usbhost_devaddr_s *hcd);
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/*******************************************************************************
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* Name: usbhost_devaddr_create
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*
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* Description:
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* Create a new unique device address for this HCD. Bind the void* arg to the
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* the device address and return the newly allocated device address.
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*
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*******************************************************************************/
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int usbhost_devaddr_create(FAR struct usbhost_devaddr_s *hcd,
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FAR void *associate);
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/*******************************************************************************
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* Name: usbhost_devaddr_find
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*
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* Description:
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* Given a device address, find the void* value that was bound to the device
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* address by usbhost_devaddr_create() when the device address was allocated.
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*
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*******************************************************************************/
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FAR void *usbhost_devaddr_find(FAR struct usbhost_devaddr_s *hcd,
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uint8_t devaddr);
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/*******************************************************************************
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* Name: usbhost_devaddr_destroy
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*
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* Description:
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* Release a device address previously allocated by usbhost_devaddr_destroy()
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* and destroy the association with the void* data.
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*
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*******************************************************************************/
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void usbhost_devaddr_destroy(FAR struct usbhost_devaddr_s *hcd, uint8_t devaddr);
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#undef EXTERN
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#if defined(__cplusplus)
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}
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#endif
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#endif /* _INCLUDE_NUTTX_USB_USBHOST_DEVADDR_H */
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