1/*
2Copyright (c) 2015 Raspberry Pi (Trading) Ltd.
3All rights reserved.
4
5Redistribution and use in source and binary forms, with or without
6modification, are permitted provided that the following conditions are met:
7 * Redistributions of source code must retain the above copyright
8 notice, this list of conditions and the following disclaimer.
9 * Redistributions in binary form must reproduce the above copyright
10 notice, this list of conditions and the following disclaimer in the
11 documentation and/or other materials provided with the distribution.
12 * Neither the name of the copyright holder nor the
13 names of its contributors may be used to endorse or promote products
14 derived from this software without specific prior written permission.
15
16THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
17ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY
20DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
23ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
25SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26*/
27
28// Utility for driving mailbox interface to VideoCore
29
30#include <stdio.h>
31#include <string.h>
32#include <stdlib.h>
33#include <fcntl.h>
34#include <unistd.h>
35#include <assert.h>
36#include <stdint.h>
37#include <sys/mman.h>
38#include <sys/ioctl.h> /* ioctl */
39
40#define DEVICE_FILE_NAME "/dev/vcio"
41#define MAJOR_NUM 100
42#define IOCTL_MBOX_PROPERTY _IOWR(MAJOR_NUM, 0, char *)
43
44/*
45 * use ioctl to send mbox property message
46 */
47
48static int mbox_property(int file_desc, void *buf)
49{
50 int ret_val = ioctl(file_desc, IOCTL_MBOX_PROPERTY, buf);
51
52 if (ret_val < 0) {
53 printf("ioctl_set_msg failed:%d\n", ret_val);
54 }
55 return ret_val;
56}
57
58
59static int mbox_open()
60{
61 int file_desc;
62
63 // open a char device file used for communicating with kernel mbox driver
64 file_desc = open(DEVICE_FILE_NAME, 0);
65 if (file_desc < 0) {
66 printf("Can't open device file: %s\n", DEVICE_FILE_NAME);
67 printf("Try creating a device file with: sudo mknod %s c %d 0\n", DEVICE_FILE_NAME, MAJOR_NUM);
68 exit(-1);
69 }
70 return file_desc;
71}
72
73static void mbox_close(int file_desc) {
74 close(file_desc);
75}
76
77
78#define MAX_WORDS 256
79
80int main(int argc, char *argv[])
81{
82 int mb = mbox_open();
83 unsigned words[MAX_WORDS] = {};
84 int i;
85
86 if (argc < 2 || argc+1 >= MAX_WORDS)
87 {
88 printf("Usage %s [word0] [word1] ...\n", argv[0]);
89 return 1;
90 }
91
92 words[0] = (argc+2) * sizeof words[0];
93 words[1] = 0; // process request
94 for (i=1; i<argc; i++)
95 words[i+1] = strtoul(argv[i], 0, 0);
96
97 words[argc+1] = 0; // end tag
98
99 int s = mbox_property(mb, words);
100
101 mbox_close(mb);
102
103 for (i=0; i<argc+2; i++)
104 printf("0x%08x ", words[i]);
105 printf("\n");
106 return s;
107}
108