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