forked from Archive/PX4-Autopilot
118 lines
4.6 KiB
C
118 lines
4.6 KiB
C
/****************************************************************************
|
|
* 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;
|
|
}
|
|
|