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/*
* Copyright 2007, Intel Corporation
* Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
*
* This file is part of PowerTOP
*
* This program file is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program in a file named COPYING; if not, write to the
* Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA
*
* Authors:
* Arjan van de Ven <arjan@linux.intel.com>
* Johannes Berg <johannes@sipsolutions.net>
*/
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <stdint.h>
#include <sys/types.h>
#include <dirent.h>
#include <linux/types.h>
#include <linux/sockios.h>
#include <sys/ioctl.h>
/* satisfy weird wireless.h include dependencies */
#include <sys/socket.h>
#include <linux/if.h>
#include <linux/wireless.h>
#include "powertop.h"
static int wext_sock = -1;
static char wireless_nic[IFNAMSIZ + 1] = {0};
static bool ps_not_working = false;
static bool check_wireless_unused(void)
{
struct iwreq wrq;
char ssid[34] = {0}; /* wext sometimes NUL-terminates */
memset(&wrq, 0, sizeof(wrq));
strncpy(wrq.ifr_name, wireless_nic, sizeof(wrq.ifr_name));
/* get mode -- PS only available in STA mode */
if (ioctl(wext_sock, SIOCGIWMODE, &wrq) < 0)
return false;
if (wrq.u.mode != IW_MODE_INFRA)
return false;
wrq.u.essid.pointer = ssid;
wrq.u.essid.length = sizeof(ssid);
if (ioctl(wext_sock, SIOCGIWESSID, &wrq) < 0)
return false;
/* no SSID, so can't be connected */
if (!wrq.u.essid.flags)
return true;
if (ioctl(wext_sock, SIOCGIWAP, &wrq) < 0)
return false;
/* no AP -- not connected */
if (memcmp(wrq.u.ap_addr.sa_data, "\0\0\0\0\0\0", 6) == 0)
return true;
return false;
}
static void activate_down_suggestion(void)
{
struct ifreq ifr;
int ret;
strncpy(ifr.ifr_name, wireless_nic, sizeof(ifr.ifr_name));
/* get flags */
ret = ioctl(wext_sock, SIOCGIFFLAGS, &ifr);
if (ret < 0)
return;
ifr.ifr_flags &= ~IFF_UP;
ioctl(wext_sock, SIOCSIFFLAGS, &ifr);
}
static int check_wireless_powersave(void)
{
struct iwreq wrq;
if (ps_not_working)
return false;
memset(&wrq, 0, sizeof(wrq));
strncpy(wrq.ifr_name, wireless_nic, sizeof(wrq.ifr_name));
/* get powersave -- if supported */
if (ioctl(wext_sock, SIOCGIWPOWER, &wrq) < 0) {
ps_not_working = 1;
return false;
}
return wrq.u.param.disabled;
}
static void activate_wireless_suggestion(void)
{
struct iwreq wrq;
memset(&wrq, 0, sizeof(wrq));
strncpy(wrq.ifr_name, wireless_nic, sizeof(wrq.ifr_name));
wrq.u.param.disabled = false;
wrq.u.param.flags = IW_POWER_ON | IW_POWER_TIMEOUT;
wrq.u.param.value = 500*1000; /* 500 ms */
again:
/* set powersave -- if supported */
if (ioctl(wext_sock, SIOCSIWPOWER, &wrq) == 0)
return;
/* maybe timeout is not supported? */
if (wrq.u.param.flags & IW_POWER_TIMEOUT) {
wrq.u.param.flags = IW_POWER_ON;
goto again;
}
ps_not_working = true;
}
static void find_wireless_nic(void)
{
DIR *net;
struct dirent *ent;
struct ifreq ifr;
struct iwreq wrq;
int ret;
memset(&ifr, 0, sizeof(struct ifreq));
memset(&wrq, 0, sizeof(wrq));
net = opendir("/sys/class/net/");
if (!net)
return;
while ((ent = readdir(net))) {
strncpy(ifr.ifr_name, ent->d_name, sizeof(ifr.ifr_name));
strncpy(wrq.ifr_name, ent->d_name, sizeof(wrq.ifr_name));
/* Check if the interface is up */
ret = ioctl(wext_sock, SIOCGIFFLAGS, &ifr);
if (ret < 0)
continue;
if (!(ifr.ifr_flags & (IFF_UP | IFF_RUNNING)))
continue;
/* and a wireless interface (that we handle) */
ret = ioctl(wext_sock, SIOCGIWNAME, &wrq);
if (ret < 0)
continue;
strcpy(wireless_nic, "wlan0");
break;
}
closedir(net);
}
void suggest_wifi_new_powersave(void)
{
char sug[1024];
if (wext_sock == -1) {
wext_sock = socket(AF_INET, SOCK_DGRAM, 0);
if (wext_sock < 0)
return;
}
if (strlen(wireless_nic) == 0)
find_wireless_nic();
if (strlen(wireless_nic) == 0)
return;
if (check_wireless_unused()) {
sprintf(sug, _("Suggestion: Disable the unused WIFI radio by setting the interface down:\n "
"ifconfig %s down\n"), wireless_nic);
add_suggestion(sug, 60, 'D', _(" D - disable wireless "), activate_down_suggestion);
} else if (check_wireless_powersave()) {
sprintf(sug, _("Suggestion: Enable wireless power saving mode by executing the following command:\n "
" iwconfig %s power timeout 500ms\n"
"This will sacrifice network performance slightly to save power."), wireless_nic);
add_suggestion(sug, 20, 'W', _(" W - Enable Wireless power saving "), activate_wireless_suggestion);
}
}
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