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wifiloader: Load kernel module if present

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Samsung does this in the macloader service,
but this is the more appropriate place for
our platform.

Change-Id: I6335fea1d73d48f3c3f9938f33b536c5cda52acb
This commit is contained in:
Christopher N. Hesse 2017-08-02 15:21:35 +02:00
parent 2c868b183c
commit 231dc651ab
2 changed files with 79 additions and 1 deletions
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8
wifiloader/Android.mk
View file

@ -9,6 +9,14 @@ LOCAL_SRC_FILES := \
LOCAL_SHARED_LIBRARIES := \
liblog libutils
ifneq ($(WIFI_DRIVER_MODULE_NAME),)
LOCAL_CFLAGS += -DWIFI_DRIVER_MODULE_NAME=\"$(WIFI_DRIVER_MODULE_NAME)\"
endif
ifneq ($(WIFI_DRIVER_MODULE_PATH),)
LOCAL_CFLAGS += -DWIFI_DRIVER_MODULE_PATH=\"$(WIFI_DRIVER_MODULE_PATH)\"
endif
LOCAL_MODULE := wifiloader
LOCAL_MODULE_TAGS := optional

72
wifiloader/wifiloader.c
View file

@ -1,5 +1,6 @@
/*
* Copyright (c) 2015 Andreas Schneider <asn@cryptomilk.org>
* Copyright (c) 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.
@ -18,17 +19,86 @@
#define LOG_NDEBUG 0
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <cutils/log.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#define DEFERRED_INITCALLS "/proc/deferred_initcalls"
#define DEFERRED_INITCALLS "/proc/deferred_initcalls"
#ifndef WIFI_DRIVER_MODULE_NAME
#define WIFI_DRIVER_MODULE_NAME "wlan"
#endif
#ifndef WIFI_DRIVER_MODULE_PATH
#define WIFI_DRIVER_MODULE_PATH "/system/lib/modules/" WIFI_DRIVER_MODULE_NAME ".ko"
#endif
#define finit_module(fd, params, flags) syscall(__NR_finit_module, fd, params, flags)
static int check_module_loaded(char const *tag)
{
FILE *proc;
char line[126];
if ((proc = fopen("/proc/modules", "r")) == NULL) {
ALOGW("Could not open %s: %s", "/proc/modules", strerror(errno));
return -errno;
}
while ((fgets(line, sizeof(line), proc)) != NULL) {
if (strncmp(line, tag, strlen(tag)) == 0) {
fclose(proc);
return 1;
}
}
fclose(proc);
return 0;
}
static int load_module(char const *path)
{
int fd;
if (check_module_loaded(WIFI_DRIVER_MODULE_NAME) > 0) {
ALOGE("Driver: %s already loaded", path);
return -1;
}
fd = open(path, O_RDONLY);
if (fd == -1) {
ALOGE("Failed to open %s - error: %s", path, strerror(errno));
return -errno;
}
// load the .ko image
if (finit_module(fd, "", 0) != 0) {
ALOGE("Failed to load module %s - error: %s", path, strerror(errno));
close(fd);
return -errno;
}
close(fd);
return 0;
}
int main(void)
{
char buf[8] = { '\0' };
FILE *fp;
size_t r;
int fd;
struct stat st;
if (stat(WIFI_DRIVER_MODULE_PATH, &st) == 0) {
ALOGD("Loading WiFi kernel module: %s", WIFI_DRIVER_MODULE_PATH);
load_module(WIFI_DRIVER_MODULE_PATH);
}
ALOGD("Trigger initcall of deferred modules\n");