137 lines
5.1 KiB
C
137 lines
5.1 KiB
C
/****************************************************************************
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* include/nuttx/configdata.h
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*
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* Copyright (C) 2013 Ken Pettit. All rights reserved.
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* Author: Ken Pettit <pettitkd@gmail.com>
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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_CONFIGDATA_H
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#define __INCLUDE_NUTTX_CONFIGDATA_H
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/* The configdata device details kernel level services for providing
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* application config data from kernel control objects, such as partitions
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* on shared MTD devices, etc.
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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 <nuttx/compiler.h>
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#include <sys/types.h>
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#include <nuttx/fs/ioctl.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* IOCTL Commands ***********************************************************/
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/* The Audio module uses a standard character driver framework. However, a
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* lot of the Audio driver functionality is configured via a device control
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* interface, such as sampling rate, volume, data format, etc.
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* The Audio ioctl commands are lised below:
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*
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* CFGDIOC_GETCONFIG - Get a specified Config Data item.
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*
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* ioctl argument: Pointer to a config_data_s structure to receive the
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* config data. All fields of the strucure must be
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* specified (i.e. id, instance, pointer and len).
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*
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* CFGDIOC_SETCONFIG - Set a specified Config Data Item
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*
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* ioctl argument: Pointer to a config_data_s structure to receive the
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* config data. All fields of the strucure must be
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* specified (i.e. id, instance, pointer and len).
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*/
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#define CFGDIOC_GETCONFIG _CFGDIOC(1)
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#define CFGDIOC_SETCONFIG _CFGDIOC(2)
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/* This structure is used to get and set config data items */
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struct config_data_s
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{
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uint16_t id; /* ID of the config data item */
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int instance; /* Instance of the item */
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FAR uint8_t *configdata; /* Pointer to the config data */
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size_t len; /* Length of the config data buffer */
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};
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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#ifdef __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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* Name: mtdconfig_register
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*
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* Description:
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* This function binds an instance of an MTD device to the /dev/config
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* device.
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*
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* When this function is called, the MTD device pass in should already
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* be initialized appropriately to access the physical device or partition.
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*
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* Input parameters:
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* mtd - Pointer to the MTD device to bind with the /dev/config device
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*
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* Returned Value:
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* Zero on success; a negated errno value on failure.
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*
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****************************************************************************/
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struct mtd_dev_s;
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int mtdconfig_register(FAR struct mtd_dev_s *mtd);
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* __INCLUDE_NUTTX_CONFIGDATA_H */
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