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/****************************************************************************
*
* Copyright (C) 2012 PX4 Development Team. All rights reserved.
* Author: Lorenz Meier <lm@inf.ethz.ch>
*
* 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 PX4 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.
*
****************************************************************************/
/**
* @file eeprom.c
*
* EEPROM service and utility app.
*/
#include <nuttx/config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/mount.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <nuttx/i2c.h>
#include <nuttx/mtd.h>
#include <nuttx/fs/nxffs.h>
#include <nuttx/fs/ioctl.h>
#include <arch/board/board.h>
#include "systemlib/systemlib.h"
#include "systemlib/param/param.h"
#include "systemlib/err.h"
#ifndef PX4_I2C_BUS_ONBOARD
# error PX4_I2C_BUS_ONBOARD not defined, cannot locate onboard EEPROM
#endif
__EXPORT int eeprom_main(int argc, char *argv[]);
static void eeprom_start(void);
static void eeprom_erase(void);
static void eeprom_ioctl(unsigned operation);
static void eeprom_save(const char *name);
static void eeprom_load(const char *name);
static bool started = false;
int eeprom_main(int argc, char *argv[])
{
if (argc >= 2) {
if (!strcmp(argv[1], "start"))
eeprom_start();
if (!strcmp(argv[1], "save_param"))
eeprom_save(argv[2]);
if (!strcmp(argv[1], "load_param"))
eeprom_load(argv[2]);
if (!strcmp(argv[1], "erase"))
eeprom_erase();
if (0) { /* these actually require a file on the filesystem... */
if (!strcmp(argv[1], "reformat"))
eeprom_ioctl(FIOC_REFORMAT);
if (!strcmp(argv[1], "repack"))
eeprom_ioctl(FIOC_OPTIMIZE);
}
}
errx(1, "expected a command, try 'start'\n\t'save_param /eeprom/parameters'\n\t'load_param /eeprom/parameters'\n\t'erase'\n");
}
static void
eeprom_start(void)
{
int ret;
if (started)
errx(1, "EEPROM service already started");
/* find the right I2C */
struct i2c_dev_s *i2c = up_i2cinitialize(PX4_I2C_BUS_ONBOARD);
/* this resets the I2C bus, set correct bus speed again */
I2C_SETFREQUENCY(i2c, 400000);
if (i2c == NULL)
errx(1, "failed to locate I2C bus");
/* start the MTD driver */
struct mtd_dev_s *mtd = at24c_initialize(i2c);
if (mtd == NULL)
errx(1, "failed to initialize EEPROM driver");
/* driver is started, even if NXFFS fails to mount */
started = true;
/* start NXFFS */
ret = nxffs_initialize(mtd);
if (ret < 0)
errx(1, "failed to initialize NXFFS - erase EEPROM to reformat");
/* mount the EEPROM */
ret = mount(NULL, "/eeprom", "nxffs", 0, NULL);
if (ret < 0)
errx(1, "failed to mount /eeprom - erase EEPROM to reformat");
errx(0, "mounted EEPROM at /eeprom");
}
extern int at24c_nuke(void);
static void
eeprom_erase(void)
{
if (!started)
errx(1, "must be started first");
if (at24c_nuke())
errx(1, "erase failed");
errx(0, "erase done, reboot now");
}
static void
eeprom_ioctl(unsigned operation)
{
int fd;
fd = open("/eeprom/.", 0);
if (fd < 0)
err(1, "open /eeprom");
if (ioctl(fd, operation, 0) < 0)
err(1, "ioctl");
exit(0);
}
static void
eeprom_save(const char *name)
{
if (!started)
errx(1, "must be started first");
if (!name)
err(1, "missing argument for device name, try '/eeprom/parameters'");
/* delete the file in case it exists */
unlink(name);
/* create the file */
int fd = open(name, O_WRONLY | O_CREAT | O_EXCL);
if (fd < 0)
err(1, "opening '%s' failed", name);
int result = param_export(fd, false);
close(fd);
if (result < 0) {
unlink(name);
errx(1, "error exporting to '%s'", name);
}
exit(0);
}
static void
eeprom_load(const char *name)
{
if (!started)
errx(1, "must be started first");
if (!name)
err(1, "missing argument for device name, try '/eeprom/parameters'");
int fd = open(name, O_RDONLY);
if (fd < 0)
err(1, "open '%s'", name);
int result = param_load(fd);
close(fd);
if (result < 0)
errx(1, "error importing from '%s'", name);
exit(0);
}
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