forked from Imagelibrary/rtems
1618e69f0e
This adds some commands that are usefull for debugging simple serial interfaces. Even if they are a complete re-implementation, the i2c* commands use a simmilar call like the Linux i2c tools.
125 lines
3.5 KiB
C
125 lines
3.5 KiB
C
/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (C) 2020 embedded brains GmbH.
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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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* 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 the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN 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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* The command implemented here has a similar interface like the one from Linux
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* i2c tools. Think of it as a heavily simplified version of them. Instead of
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* the bus number they expect a bus path.
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*
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* Additionally it is possible to write multiple values as a continuous write.
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*/
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#include <dev/i2c/i2c.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <rtems/shell.h>
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static const char rtems_i2cset_shell_usage [] =
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"i2cset <I2C_BUS> <CHIP-ADDRESS> <DATA-ADDRESS> <VALUE> [<VALUE> [...]]\n"
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"\tset one byte of an EEPROM like i2c device\n";
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static int
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rtems_i2cset_shell_main(int argc, char *argv[])
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{
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int fd;
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int rv;
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const char *bus;
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uint16_t chip_address;
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/* Necessary: data-address and values. This will be a bit more. */
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uint8_t writebuff[argc];
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size_t len;
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size_t i;
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i2c_msg msgs[] = {{
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.flags = 0,
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.buf = writebuff,
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.len = 0,
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}};
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struct i2c_rdwr_ioctl_data payload = {
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.msgs = msgs,
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.nmsgs = sizeof(msgs)/sizeof(msgs[0]),
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};
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if (argc < 5) {
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printf(rtems_i2cset_shell_usage);
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return 1;
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}
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errno = 0;
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chip_address = (uint16_t) strtoul(argv[2], NULL, 0);
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if (errno != 0) {
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perror("Couldn't read CHIP_ADDRESS");
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return 1;
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}
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msgs[0].addr = chip_address;
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errno = 0;
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writebuff[0] = (uint8_t) strtoul(argv[3], NULL, 0);
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if (errno != 0) {
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perror("Couldn't read DATA_ADDRESS");
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return 1;
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}
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/* Read values starting from the fifth argument (index 4) */
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i = 4;
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len = 0;
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while (i < argc) {
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errno = 0;
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writebuff[len + 1] = (uint8_t) strtoul(argv[i], NULL, 0);
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if (errno != 0) {
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perror("Couldn't read VALUE");
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return 1;
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}
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++i;
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++len;
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}
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msgs[0].len = len + 1; /* Don't forget address */
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bus = argv[1];
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fd = open(bus, O_RDWR);
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if (fd < 0) {
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perror("Couldn't open bus");
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return 1;
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}
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rv = ioctl(fd, I2C_RDWR, &payload);
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if (rv < 0) {
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perror("ioctl failed");
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}
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close(fd);
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return rv;
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}
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rtems_shell_cmd_t rtems_shell_I2CSET_Command = {
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.name = "i2cset",
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.usage = rtems_i2cset_shell_usage,
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.topic = "misc",
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.command = rtems_i2cset_shell_main,
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};
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