113 lines
3.7 KiB
C
113 lines
3.7 KiB
C
/************************************************************************************
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* configs/samv71-xult/src/sam_at24config.c
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*
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* Copyright (C) 2015-2016 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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 <errno.h>
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#include <debug.h>
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#include <nuttx/mtd/configdata.h>
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#include <nuttx/mtd/mtd.h>
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#include <nuttx/fs/ioctl.h>
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#include "sam_twihs.h"
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#include "samv71-xult.h"
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#ifdef HAVE_MTDCONFIG
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/************************************************************************************
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* Public Functions
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************************************************************************************/
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/************************************************************************************
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* Name: sam_at24config
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*
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* Description:
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* Create an AT24xx-based MTD configuration device for storage device configuration
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* information.
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*
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************************************************************************************/
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int sam_at24config(void)
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{
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struct i2c_master_s *i2c;
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struct mtd_dev_s *at24;
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int ret;
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/* Get an instance of the TWI0 interface */
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i2c = sam_i2cbus_initialize(0);
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if (!i2c)
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{
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ferr("ERROR: Failed to initialize TWI0\n");
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return -ENODEV;
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}
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/* Initialize the AT24 driver */
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at24 = at24c_initialize(i2c);
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if (!at24)
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{
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ferr("ERROR: Failed to initialize the AT24 driver\n");
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(void)sam_i2cbus_uninitialize(i2c);
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return -ENODEV;
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}
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/* Make sure that the AT24 is in normal memory access mode */
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ret = at24->ioctl(at24, MTDIOC_EXTENDED, 0);
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if (ret < 0)
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{
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ferr("ERROR: AT24 ioctl(MTDIOC_EXTENDED) failed: %d\n", ret);
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}
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/* Bind the instance of an MTD device to the /dev/config device. */
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ret = mtdconfig_register(at24);
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if (ret < 0)
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{
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ferr("ERROR: Failed to bind AT24 driver to the MTD config device\n");
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(void)sam_i2cbus_uninitialize(i2c);
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}
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return ret;
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}
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#endif /* HAVE_MTDCONFIG */
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