1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
|
/*
* 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.
*/
#include <dev/i2c/i2c.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <rtems/shell.h>
static const char rtems_i2cdetect_shell_usage [] =
"i2cdetect <I2C_BUS>\n"
"\ttry to detect i2c devices on the given bus\n";
static int rtems_i2cdetect_shell_main(int argc, char *argv[])
{
int fd;
int rv;
const char *bus;
const uint16_t first = 1;
const uint16_t last = 0x7f;
uint16_t current;
if (argc != 2 || strcmp(argv[1], "-h") == 0) {
printf(rtems_i2cdetect_shell_usage);
return 1;
}
bus = argv[1];
fd = open(bus, O_RDWR);
if (fd < 0) {
perror("Couldn't open bus");
return 1;
}
printf(" x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 xA xB xC xD xE xF\n"
"0x ");
for (current = first; current <= last; ++current) {
i2c_msg msg = {
.addr = current,
.flags = 0,
.len = 0,
.buf = NULL,
};
struct i2c_rdwr_ioctl_data payload = {
.msgs = &msg,
.nmsgs = 1,
};
if ((current & 0x0F) == 0) {
printf("\n%1xx ", current >> 4);
}
rv = ioctl(fd, I2C_RDWR, &payload);
if (rv < 0) {
if (errno != EIO) {
perror("ioctl failed");
}
printf(" --");
} else {
printf(" %02x", current);
}
}
printf("\n");
close(fd);
return 0;
}
rtems_shell_cmd_t rtems_shell_I2CDETECT_Command = {
.name = "i2cdetect",
.usage = rtems_i2cdetect_shell_usage,
.topic = "misc",
.command = rtems_i2cdetect_shell_main,
};
|
