forked from Archive/PX4-Autopilot
118 lines
4.6 KiB
C
118 lines
4.6 KiB
C
/****************************************************************************
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* drivers/usbhost/usbhost_registerclass.c
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*
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* Copyright (C) 2010 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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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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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <errno.h>
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#include <debug.h>
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#include <arch/irq.h>
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#include <nuttx/usb/usbhost.h>
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#include "usbhost_registry.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: usbhost_registerclass
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*
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* Description:
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* Register a USB host class implementation. The caller provides an
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* instance of struct usbhost_registry_s that contains all of the
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* information that will be needed later to (1) associate the USB host
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* class implementation with a connected USB device, and (2) to obtain and
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* bind a struct usbhost_class_s instance for the device.
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*
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* Input Parameters:
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* class - An write-able instance of struct usbhost_registry_s that will be
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* maintained in a registry.
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*
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* Returned Values:
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* On success, this function will return zero (OK). Otherwise, a negated
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* errno value is returned.
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*
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****************************************************************************/
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int usbhost_registerclass(struct usbhost_registry_s *class)
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{
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irqstate_t flags;
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uvdbg("Registering class:%p nids:%d\n", class, class->nids);
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/* g_classregistry is a singly-linkedlist of class ID information added by
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* calls to usbhost_registerclass(). Since this list is accessed from USB
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* host controller interrupt handling logic, accesses to this list must be
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* protected by disabling interrupts.
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*/
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flags = irqsave();
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/* Add the new class ID info to the head of the list */
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class->flink = g_classregistry;
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g_classregistry = class;
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irqrestore(flags);
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return OK;
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}
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