Try to remove /data/system/wpa_supplicant/ folder. Or create it. It helped 
my device to connect Wifi
On Thursday, October 8, 2015 at 4:32:15 PM UTC+3, Mr. Martin wrote:
>
> I am facing the same problem... 
>
>
>
>
>
>
>
> *E/WifiHW  (  828): Unable to open connection to supplicant on 
> "/data/system/wpa_supplicant/wlan0": No such file or directorycan somebody 
> help ? Martin*
>
> On Thursday, February 17, 2011 at 4:17:08 PM UTC+1, bala krishnan wrote:
>>
>> Hi,
>>    I am porting sd8688 wifi module to froyo on pxa3xx based board. While 
>> selecting option Wi-Fi from "Wireless & networks" in Android, the driver & 
>> firmare is loaded well after that this option got deselected with error.
>>
>>    While looking on the external/wpa_supplicant package, I have doubt 
>> with following piece of code from wpa_ctrl_open(const char *ctrl_path) 
>> which belongs to wpa_ctrl.c file
>>
>>  if (connect(ctrl->s, (struct sockaddr *) &ctrl->dest,
>>                     sizeof(ctrl->dest)) < 0) {
>>                 close(ctrl->s);
>>                 unlink(ctrl->local.sun_path);
>>                 os_free(ctrl);
>>                 LOGE("wpa_ctrl_open (5)");
>>                 return NULL;
>>         }
>>
>>
>> logcat details
>> =============
>> [  189.508299] calling  lbs_init_module+0x0/0xdc [libertas] @ 861
>> [  189.514760] initcall lbs_init_module+0x0/0xdc [libertas] returned 0 
>> after 8 usecs
>> [  190.076393] calling  if_sdio_init_module+0x0/0x10c [libertas_sdio] @ 
>> 861
>> [  190.083400] libertas_sdio: Libertas SDIO driver
>> [  190.087904] libertas_sdio: Copyright Pierre Ossman
>> [  190.094414] libertas_sdio mmc1:0001:1: firmware: requesting 
>> sd8688_helper.bin
>> [  190.170002] init: untracked pid 1072 exited
>> [  190.202575] libertas_sdio mmc1:0001:1: firmware: requesting sd8688.bin
>> [  190.548485] init: untracked pid 1075 exited
>> [  191.529540] libertas: 00:27:13:82:f5:d2, fw 10.38.1p25, cap 0x00000303
>> [  191.551094] libertas: wlan0: Marvell WLAN 802.11 adapter
>> [  191.560391] initcall if_sdio_init_module+0x0/0x10c [libertas_sdio] 
>> returned 0 after 1442302 usecs
>> D/Tethering(  828): wlan0 is not a tetherable iface, ignoring
>> D/skia    (  828): purging 149K from font cache [18 entries]
>> D/dalvikvm(  828): GC_EXPLICIT freed 1956 objects / 154824 bytes in 124ms
>> D/WifiService(  828): ACTION_BATTERY_CHANGED pluggedType: 0
>> E/Wpa_supplicant_code(  828): wpa_ctrl_open 
>> (3)ctrl_path=/data/system/wpa_supplicant/wlan0 
>> E/Wpa_supplicant_code(  828): wpa_ctrl_open 
>> (5)dest.sun_path=/data/system/wpa_supplicant/wlan0 
>> sizeof(ctrl->dest.sun_path)=108 ctrl_path=/data/system/wpa_supplicant/wlan0
>> E/Wpa_supplicant_code(  828): wpa_ctrl_open (6)ctrl->s=16 
>> &ctrl->dest=c05b2 sizeof(ctrl->dest)=110
>> E/Wpa_supplicant_code(  828): wpa_ctrl_open (5)
>> *E/WifiHW  (  828): Unable to open connection to supplicant on 
>> "/data/system/wpa_supplicant/wlan0": No such file or directory*
>> E/wpa_supplicant( 1082): Failed to initialize control interface 
>> 'DIR=/data/system/wpa_supplicant GROUP=system'.
>> E/wpa_supplicant( 1082): You may have another wpa_supplicant process 
>> already running or the file was
>> E/wpa_supplicant( 1082): left by an unclean termination of wpa_supplicant 
>> in which case you will need
>> E/wpa_supplicant( 1082): to manually remove this file before starting 
>> wpa_supplicant again.
>> I/wpa_supplicant( 1082): CTRL-EVENT-STATE-CHANGE id=-1 state=0
>> [  197.630222] pxa2xx-mci pxa2xx-mci.0: unable to stop clock
>> E/wpa_supplicant( 1088): Failed to initialize control interface 
>> 'DIR=/data/system/wpa_supplicant GROUP=system'.
>> E/wpa_supplicant( 1088): You may have another wpa_supplicant process 
>> already running or the file was
>> E/wpa_supplicant( 1088): left by an unclean termination of wpa_supplicant 
>> in which case you will need
>> E/wpa_supplicant( 1088): to manually remove this file before starting 
>> wpa_supplicant again.
>> I/wpa_supplicant( 1088): CTRL-EVENT-STATE-CHANGE id=-1 state=0
>> E/WifiHW  (  828): Supplicant not running, cannot connect
>> D/skia    (  895): purging 72K from font cache [10 entries]
>> D/dalvikvm(  895): GC_EXPLICIT freed 9869 objects / 476880 bytes in 180ms
>> E/wpa_supplicant( 1091): Failed to initialize control interface 
>> 'DIR=/data/system/wpa_supplicant GROUP=system'.
>> E/wpa_supplicant( 1091): You may have another wpa_supplicant process 
>> already running or the file was
>> E/wpa_supplicant( 1091): left by an unclean termination of wpa_supplicant 
>> in which case you will need
>> E/wpa_supplicant( 1091): to manually remove this file before starting 
>> wpa_supplicant again.
>> I/wpa_supplicant( 1091): CTRL-EVENT-STATE-CHANGE id=-1 state=0
>> E/WifiHW  (  828): Supplicant not running, cannot connect
>> E/wpa_supplicant( 1094): Failed to initialize control interface 
>> 'DIR=/data/system/wpa_supplicant GROUP=system'.
>> E/wpa_supplicant( 1094): You may have another wpa_supplicant process 
>> already running or the file was
>> E/wpa_supplicant( 1094): left by an unclean termination of wpa_supplicant 
>> in which case you will need
>> E/wpa_supplicant( 1094): to manually remove this file before starting 
>> wpa_supplicant again.
>> I/wpa_supplicant( 1094): CTRL-EVENT-STATE-CHANGE id=-1 state=0
>> E/WifiHW  (  828): Supplicant not running, cannot connect
>> V/WifiStateTracker(  828): Supplicant died unexpectedly
>> D/WifiStateTracker(  828): Reset connections and stopping DHCP
>> D/WifiStateTracker(  828): Disabling interface
>> D/NetworkStateTracker(  828): setDetailed state, old =IDLE and new 
>> state=DISCONNECTED
>> D/ConnectivityService(  828): ConnectivityChange for WIFI: 
>> DISCONNECTED/DISCONNECTED
>> D/ConnectivityService(  828): getMobileDataEnabled returning true
>> D/WifiStateTracker(  828): Reset connections and stopping DHCP
>> D/DataConnectionTracker(  891): enableApnType(default), isApnTypeActive = 
>> false and state = IDLE
>> D/DataConnectionTracker(  891): type not available
>> D/Tethering(  828): Tethering got CONNECTIVITY_ACTION
>> I/ActivityManager(  828): Start proc android.process.media for broadcast 
>> com.android.providers.downloads/.DownloadReceiver: pid=1097 uid=10009 
>> gids={1015, 2001, 3003}
>> D/Tethering(  828): MasterInitialState.processMessage what=3
>> E/HierarchicalStateMachine(  828): TetherMaster - unhandledMessage: 
>> msg.what=3
>> D/WifiStateTracker(  828): Disabling interface
>>
>> init.rc 
>> =======
>>     mkdir /data/misc/wifi 0770 wifi system
>>     chown wifi system /data/misc/wifi
>>     touch /data/misc/wifi/wpa_supplicant.conf
>>     chmod 0660 /data/misc/wifi/wpa_supplicant.conf
>>     chown wifi system /data/misc/wifi/wpa_supplicant.conf
>>     mkdir /data/misc/wifi/sockets 0771 wifi system
>>     chown wifi system /data/misc/wifi/sockets
>>     chmod 0771 /data/misc/wifi/sockets
>>     mkdir /data/misc/android 0770 wifi system
>>     mkdir /data/system/wpa_supplicant 0770 wifi system
>>     mkdir /data/misc/dhcp 0770 dhcp dhcp
>>     chown dhcp dhcp /data/misc/dhcp
>>     chmod 0770 /data/misc/dhcp
>>     setprop wifi.interface wlan0
>> service wpa_supplicant /system/bin/wpa_supplicant -Dwext -iwlan0 
>> -c/data/misc/wifi/wpa_supplicant.conf
>>     user wifi system
>>     group system
>>     disabled
>>
>> service dhcpcd /system/bin/dhcpcd -B wlan0
>>     disabled
>>     oneshot
>>
>> With Regards
>> J.Balakrishnan
>>
>>

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