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/****************************************************************************
* drivers/usbhost/usbhost_registerclass.c
*
* Copyright (C) 2010 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <errno.h>
#include <debug.h>
#include <arch/irq.h>
#include <nuttx/usb/usbhost.h>
#include "usbhost_registry.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: usbhost_registerclass
*
* Description:
* Register a USB host class implementation. The caller provides an
* instance of struct usbhost_registry_s that contains all of the
* information that will be needed later to (1) associate the USB host
* class implementation with a connected USB device, and (2) to obtain and
* bind a struct usbhost_class_s instance for the device.
*
* Input Parameters:
* class - An write-able instance of struct usbhost_registry_s that will be
* maintained in a registry.
*
* Returned Values:
* On success, this function will return zero (OK). Otherwise, a negated
* errno value is returned.
*
****************************************************************************/
int usbhost_registerclass(struct usbhost_registry_s *class)
{
irqstate_t flags;
uvdbg("Registering class:%p nids:%d\n", class, class->nids);
/* g_classregistry is a singly-linkedlist of class ID information added by
* calls to usbhost_registerclass(). Since this list is accessed from USB
* host controller interrupt handling logic, accesses to this list must be
* protected by disabling interrupts.
*/
flags = irqsave();
/* Add the new class ID info to the head of the list */
class->flink = g_classregistry;
g_classregistry = class;
irqrestore(flags);
return OK;
}
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