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
108
109
110
111
|
/*
* Copyright (C) 2008 The Android Open Source Project
* Copyright (C) 2015-2017 Christopher N. Hesse <raymanfx@gmail.com>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "modemloader"
#define LOG_NDEBUG 0
#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <ctype.h>
#include <errno.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/un.h>
#include <cutils/properties.h>
#include <cutils/log.h>
void parse_hardware_revision(unsigned int *revision)
{
const char *cpuinfo = "/proc/cpuinfo";
char *data = NULL;
size_t len = 0, limit = 1024;
int fd, n;
char *x, *rev;
fd = open(cpuinfo, O_RDONLY);
if (fd < 0) return;
for (;;) {
x = (char*)realloc(data, limit);
if (!x) {
ALOGE("Failed to allocate memory to read %s\n", cpuinfo);
goto done;
}
data = x;
n = read(fd, data + len, limit - len);
if (n < 0) {
ALOGE("Failed reading %s: %s (%d)\n", cpuinfo, strerror(errno), errno);
goto done;
}
len += n;
if (len < limit)
break;
/* We filled the buffer, so increase size and loop to read more */
limit *= 2;
}
data[len] = 0;
rev = strstr(data, "\nRevision");
if (rev) {
x = strstr(rev, ": ");
if (x) {
*revision = strtoul(x + 2, 0, 16);
}
}
done:
close(fd);
free(data);
}
int main(void)
{
unsigned int revision;
char hardware_revision[PROP_VALUE_MAX];
const char *properties[] = {"hw.revision", "ro.cbd.dt_revision", "ril.cbd.dt_revision"};
// try to read the revision from the kernel cmdline
revision = property_get_int32("ro.boot.hw_rev", 0);
// if the property was not exported, try to parse /proc/cpuinfo
if (revision == 0) {
parse_hardware_revision(&revision);
}
snprintf(hardware_revision, PROP_VALUE_MAX, "%d", revision);
// set all the properties
const int array_length = sizeof(properties) / sizeof(properties[0]);
for (int i = 0; i < array_length; i++) {
property_set(properties[i], hardware_revision);
}
// indicate that we are done
property_set("ro.modemloader.done", "1");
return 0;
}
|
