forked from Imagelibrary/rtems
146 lines
3.8 KiB
C
146 lines
3.8 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 & Co. KG
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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 the i2cget has a continuous read mode that isn't available on
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* Linux but does something similar to i2cdump.
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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_i2cget_shell_usage [] =
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"i2cget <I2C_BUS> <CHIP-ADDRESS> <DATA-ADDRESS> [<NR-BYTES>]\n"
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"\tGet one or more bytes from an EEPROM like i2c device.\n"
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"\tNote that multiple bytes will be read in continuous mode.\n";
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static int read_bytes(
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int fd,
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uint16_t i2c_address,
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uint8_t data_address,
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uint16_t nr_bytes
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)
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{
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int rv;
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uint8_t value[nr_bytes];
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i2c_msg msgs[] = {{
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.addr = i2c_address,
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.flags = 0,
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.buf = &data_address,
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.len = 1,
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}, {
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.addr = i2c_address,
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.flags = I2C_M_RD,
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.buf = value,
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.len = nr_bytes,
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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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uint16_t i;
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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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} else {
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for (i = 0; i < nr_bytes; ++i) {
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printf("0x%02x ", value[i]);
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}
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printf("\n");
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}
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return rv;
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}
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static int rtems_i2cget_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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uint8_t data_address;
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uint16_t nr_bytes;
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if (argc < 4 || argc > 5) {
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printf(rtems_i2cget_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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errno = 0;
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data_address = (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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nr_bytes = 1;
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if (argc == 5) {
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errno = 0;
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nr_bytes = (uint16_t) strtoul(argv[4], NULL, 0);
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if (errno != 0) {
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perror("Couldn't read number of bytes");
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return 1;
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}
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}
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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 = read_bytes(fd, chip_address, data_address, nr_bytes);
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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_I2CGET_Command = {
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.name = "i2cget",
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.usage = rtems_i2cget_shell_usage,
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.topic = "misc",
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.command = rtems_i2cget_shell_main,
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};
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