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/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (C) 2020 embedded brains GmbH.
*
* 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.
*
* 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.
*/
/*
* The command implemented here has a similar interface like the one from Linux
* i2c tools. Think of it as a heavily simplified version of them. Instead of
* the bus number they expect a bus path.
*
* Additionally it is possible to write multiple values as a continuous write.
*/
#include <dev/i2c/i2c.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <rtems/shell.h>
static const char rtems_i2cset_shell_usage [] =
"i2cset <I2C_BUS> <CHIP-ADDRESS> <DATA-ADDRESS> <VALUE> [<VALUE> [...]]\n"
"\tset one byte of an EEPROM like i2c device\n";
static int
rtems_i2cset_shell_main(int argc, char *argv[])
{
int fd;
int rv;
const char *bus;
uint16_t chip_address;
/* Necessary: data-address and values. This will be a bit more. */
uint8_t writebuff[argc];
size_t len;
size_t i;
i2c_msg msgs[] = {{
.flags = 0,
.buf = writebuff,
.len = 0,
}};
struct i2c_rdwr_ioctl_data payload = {
.msgs = msgs,
.nmsgs = sizeof(msgs)/sizeof(msgs[0]),
};
if (argc < 5) {
printf(rtems_i2cset_shell_usage);
return 1;
}
errno = 0;
chip_address = (uint16_t) strtoul(argv[2], NULL, 0);
if (errno != 0) {
perror("Couldn't read CHIP_ADDRESS");
return 1;
}
msgs[0].addr = chip_address;
errno = 0;
writebuff[0] = (uint8_t) strtoul(argv[3], NULL, 0);
if (errno != 0) {
perror("Couldn't read DATA_ADDRESS");
return 1;
}
/* Read values starting from the fifth argument (index 4) */
i = 4;
len = 0;
while (i < argc) {
errno = 0;
writebuff[len + 1] = (uint8_t) strtoul(argv[i], NULL, 0);
if (errno != 0) {
perror("Couldn't read VALUE");
return 1;
}
++i;
++len;
}
msgs[0].len = len + 1; /* Don't forget address */
bus = argv[1];
fd = open(bus, O_RDWR);
if (fd < 0) {
perror("Couldn't open bus");
return 1;
}
rv = ioctl(fd, I2C_RDWR, &payload);
if (rv < 0) {
perror("ioctl failed");
}
close(fd);
return rv;
}
rtems_shell_cmd_t rtems_shell_I2CSET_Command = {
.name = "i2cset",
.usage = rtems_i2cset_shell_usage,
.topic = "misc",
.command = rtems_i2cset_shell_main,
};
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