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/*
* Copyright 2016, The Android Open Source Project
*
* 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.
*/
#include "hardware_legacy/wifi.h"
#define LOG_TAG "WifiHalCommon"
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include <cutils/log.h>
#include <cutils/misc.h>
#include <cutils/properties.h>
extern "C" int init_module(void *, unsigned long, const char *);
extern "C" int delete_module(const char *, unsigned int);
#ifndef WIFI_DRIVER_FW_PATH_STA
#define WIFI_DRIVER_FW_PATH_STA NULL
#endif
#ifndef WIFI_DRIVER_FW_PATH_AP
#define WIFI_DRIVER_FW_PATH_AP NULL
#endif
#ifndef WIFI_DRIVER_FW_PATH_P2P
#define WIFI_DRIVER_FW_PATH_P2P NULL
#endif
#ifndef WIFI_DRIVER_FW_PATH_PARAM
#define WIFI_DRIVER_FW_PATH_PARAM "/sys/module/wlan/parameters/fwpath"
#endif
#ifndef WIFI_DRIVER_MODULE_ARG
#define WIFI_DRIVER_MODULE_ARG ""
#endif
static const char DRIVER_PROP_NAME[] = "wlan.driver.status";
#ifdef WIFI_DRIVER_MODULE_PATH
static const char DRIVER_MODULE_NAME[] = WIFI_DRIVER_MODULE_NAME;
static const char DRIVER_MODULE_TAG[] = WIFI_DRIVER_MODULE_NAME " ";
static const char DRIVER_MODULE_PATH[] = WIFI_DRIVER_MODULE_PATH;
static const char DRIVER_MODULE_ARG[] = WIFI_DRIVER_MODULE_ARG;
static const char MODULE_FILE[] = "/proc/modules";
#endif
static int insmod(const char *filename, const char *args)
{
void *module;
unsigned int size;
int ret;
module = load_file(filename, &size);
if (!module)
return -1;
ret = init_module(module, size, args);
free(module);
return ret;
}
static int rmmod(const char *modname)
{
int ret = -1;
int maxtry = 10;
while (maxtry-- > 0) {
ret = delete_module(modname, O_NONBLOCK | O_EXCL);
if (ret < 0 && errno == EAGAIN)
usleep(500000);
else
break;
}
if (ret != 0)
ALOGD("Unable to unload driver module \"%s\": %s\n",
modname, strerror(errno));
return ret;
}
#ifdef WIFI_DRIVER_STATE_CTRL_PARAM
int wifi_change_driver_state(const char *state)
{
int len;
int fd;
int ret = 0;
if (!state)
return -1;
fd = TEMP_FAILURE_RETRY(open(WIFI_DRIVER_STATE_CTRL_PARAM, O_WRONLY));
if (fd < 0) {
ALOGE("Failed to open driver state control param (%s)", strerror(errno));
return -1;
}
len = strlen(state) + 1;
if (TEMP_FAILURE_RETRY(write(fd, state, len)) != len) {
ALOGE("Failed to write driver state control param (%s)", strerror(errno));
ret = -1;
}
close(fd);
return ret;
}
#endif
int is_wifi_driver_loaded() {
char driver_status[PROPERTY_VALUE_MAX];
#ifdef WIFI_DRIVER_MODULE_PATH
FILE *proc;
char line[sizeof(DRIVER_MODULE_TAG)+10];
#endif
if (!property_get(DRIVER_PROP_NAME, driver_status, NULL)
|| strcmp(driver_status, "ok") != 0) {
return 0; /* driver not loaded */
}
#ifdef WIFI_DRIVER_MODULE_PATH
/*
* If the property says the driver is loaded, check to
* make sure that the property setting isn't just left
* over from a previous manual shutdown or a runtime
* crash.
*/
if ((proc = fopen(MODULE_FILE, "r")) == NULL) {
ALOGW("Could not open %s: %s", MODULE_FILE, strerror(errno));
property_set(DRIVER_PROP_NAME, "unloaded");
return 0;
}
while ((fgets(line, sizeof(line), proc)) != NULL) {
if (strncmp(line, DRIVER_MODULE_TAG, strlen(DRIVER_MODULE_TAG)) == 0) {
fclose(proc);
return 1;
}
}
fclose(proc);
property_set(DRIVER_PROP_NAME, "unloaded");
return 0;
#else
return 1;
#endif
}
int wifi_load_driver()
{
#ifdef WIFI_DRIVER_MODULE_PATH
if (is_wifi_driver_loaded()) {
return 0;
}
if (insmod(DRIVER_MODULE_PATH, DRIVER_MODULE_ARG) < 0)
return -1;
#elif defined WIFI_DRIVER_STATE_CTRL_PARAM
if (is_wifi_driver_loaded()) {
return 0;
}
if (wifi_change_driver_state(WIFI_DRIVER_STATE_ON) < 0)
return -1;
#endif
property_set(DRIVER_PROP_NAME, "ok");
return 0;
}
int wifi_unload_driver()
{
usleep(200000); /* allow to finish interface down */
#ifdef WIFI_DRIVER_MODULE_PATH
if (rmmod(DRIVER_MODULE_NAME) == 0) {
int count = 20; /* wait at most 10 seconds for completion */
while (count-- > 0) {
if (!is_wifi_driver_loaded())
break;
usleep(500000);
}
usleep(500000); /* allow card removal */
if (count) {
return 0;
}
return -1;
} else
return -1;
#else
#ifdef WIFI_DRIVER_STATE_CTRL_PARAM
if (is_wifi_driver_loaded()) {
if (wifi_change_driver_state(WIFI_DRIVER_STATE_OFF) < 0)
return -1;
}
#endif
property_set(DRIVER_PROP_NAME, "unloaded");
return 0;
#endif
}
const char *wifi_get_fw_path(int fw_type)
{
switch (fw_type) {
case WIFI_GET_FW_PATH_STA:
return WIFI_DRIVER_FW_PATH_STA;
case WIFI_GET_FW_PATH_AP:
return WIFI_DRIVER_FW_PATH_AP;
case WIFI_GET_FW_PATH_P2P:
return WIFI_DRIVER_FW_PATH_P2P;
}
return NULL;
}
int wifi_change_fw_path(const char *fwpath)
{
int len;
int fd;
int ret = 0;
if (!fwpath)
return ret;
fd = TEMP_FAILURE_RETRY(open(WIFI_DRIVER_FW_PATH_PARAM, O_WRONLY));
if (fd < 0) {
ALOGE("Failed to open wlan fw path param (%s)", strerror(errno));
return -1;
}
len = strlen(fwpath) + 1;
if (TEMP_FAILURE_RETRY(write(fd, fwpath, len)) != len) {
ALOGE("Failed to write wlan fw path param (%s)", strerror(errno));
ret = -1;
}
close(fd);
return ret;
}
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