Porting WLAN SoftAP to Android

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[edit] MCP 2.5.1 WiLink Driver: Description

MCP WiLink Driver 2.5.1 source code was tested as a standalone component on OMAP4 Blaze / OMAP4 BlazeTablet platforms with WiLink 1283 PG2.21 connectivity hardware.

[edit] Improvements in SoftAP 2.09

[edit] Procedures to port WLAN driver on Android File System (AFS)

This section explains the build procedure of porting WLAN SoftAP driver in Android on OMAP4 platform, Blaze. Refer to www.omapzoom.org website for instructions on how to create a repo. Once you have the repo ready, follow the steps below.


[edit] To Enable WLAN on Linux Kernel

 # make menuconfig
Enable wireless extension in networking support (Default setting):
 [*] Networking Support --->
 [*] Wireless --->
Enable MMC5 support in OMAP:
 Device Drivers --->
 <*> MMC/SD/SDIO card Support --->
 <*> TI OMAP High Speed Multimedia Card Interface support
Disable Module Versioning Support:
 [*] Enable loadable module support --->
 [ ] Module versioning support
Enable TI WLAN enhanced SDIO support and interface controller number to 5 in system type:
 System Type --->
 [*] Enable WiFi control function abstraction
 [*] TI WLAN Enhanced SDIO Controller support
 (5) MMC Controller number that TI WLAN chip is connected to
Update following environment variables and build the Kernel:

Please note Toolchain required is 2010q1-202.[1]

 # export YOUR_PATH=`pwd`
 # export PATH=${YOUR_PATH}/u-boot/tools:${PATH} //path of mkimage for uImage
 # export PATH=$PATH:${YOUR_PATH}/toolchain/arm-2010q1/bin //path of cross complier
 # cd ${YOUR_PATH}/kernel/android-2.6.35 
 # export CROSS_COMPILE=arm-none-linux-gnueabi-
 # export ARCH=arm
 # make android_4430_defconfig
 # make uImage

[edit] To Build SoftAP Driver Procedure

Go to WLAN SoftAP Driver location:
# cd hardware/ti/wlan/wl1283_softAP/
Go to the build path:
# cd platforms/os/linux
Update the environment variable of kernel:
# export KERNEL_DIR = ${YOUR_PATH}/kernel/android-2.6.35 
Make sure the following environment variables:
# echo $PATH            //<Location of your compiler>:$PATH
# echo $CROSS_COMPILE   //arm-none-linux-gnueabiexport
# echo $ARCH            //arm
# echo $KERNEL_DIR      //<path to the kernel folder where you performed step1>
Start the build:
# make TNETW=1283
Place where the target files are placed after build:
Module 		File Name 	Location
WLAN Driver 	tiap_drv.ko 	platform/os/linux/
INI File 	tiwlan_ap.ini 	config/
FIRMWARE 	firmware_ap.bin downloaded from https://gforge.ti.com/gf/project/wilink_drivers/

[edit] Porting SoftAP Driver To ANDROID File system (AFS)

This section we showed how to build ANDROID file system with all configuration files required for WLAN SoftAP are placed in appropriate locations. And also wlan_ap_loader and tiap_cu are built as part of Android file system.

The functionality of wlan_ap_loader is used to download the WLAN SoftAP firmware. The configuration utility (tiap_cu) provided by TI is used to configure WLAN SoftAP driver and firmware, and to perform most SoftAP operations, such as signal channel, SSID, and beacon rate. Besides, Android uses a hostapd daemon for Hotspot support.

Location and versions:
hostapd ver 0.6.x --> ${YOUR_PATH}/external/hostapd
choose the hostapd version for GingerBread:
HOSTAPD_VERSION             := VER_0_6_X
The way SoftAP driver in Gingerbread is selected by the variable of BOARD_SOFTAP_DEVICE in BoardConfig.mk file. We just specify the folder name of driver located in mydroid/hardware/ti/wlan folder as value of the variable:
BOARD_SOFTAP_DEVICE         := wl1283
In our case, Android builds the following components
We have related SoftAP variables in BoardConfig.mk:
Ensure the interface defined in hostapd.conf (...system/etc/wifi/softap/)
Finally, these files need to be placed in properly locations on target platform before testing:
Kernel image         --> /root/uImage
SoftAP Driver module --> /system/etc/wifi/softap/tiap_drv.ko
SoftAP firmware file --> /system/etc/wifi/softap/firmware_ap.bin

[edit] Testing SoftAP on Blaze Platform with GingerBread

[edit] SOFT AP Setup and Testing

  1. Once you have the kernel, SoftAP driver and file system built, follow the procedure below to set up and test SoftAP on Blaze.
  2. Place the files tiap_drv.ko and firmware_ap.bin in the folder of /system/etc/wifi/softap
  3. Make sure /system/etc/wifi/softap folder also has tiwlan_ap.ini and hostapd.conf . These are placed in the location when file system is built.

Note: Make sure you use the same kernel that you built the kernel image as the SoftAP drivers.

[edit] SOFTAP Testing by Gingerbread GUI

Note: Before making OMAP4(Blaze) in AP mode, make sure normal WiFi is turned off and similarly if you want to use normal WiFi, turn off SoftAP.

Settings --> Wireless & network settings --> Tethering & portable hotspot --> Portable Wi-Fi hotspot
to configure and start to configure the property...
Settings --> Wireless & network settings --> Tethering & portable hotspot 
--> Portable Wi-Fi hotspot settings --> Configure Wi-Fi hotspot
define the "Network SSID" as ‘AndroidAP’ and choose "Security" option on the drop-down menu:
Open or WPA2 PSK //They are only secury options of portable hotspot supported by Gingerbread
'Save' the configuration...
  1. Scan for ‘AndroidAP’ AP and click on 'Connect'. You should be now able to connect to it.
  2. Browse the PC, connecting to the Ethernet interface of SoftAP, by typing the PC IP address in browser.
Menu --> Settings --> Wireless & Networks --> Tethering & portable hotspot --> Portable Wi-Fi hotspot

[edit] SOFTAP Testing by TI WLAN SOFTAP CLI (non GUI)

Go the path
# cd /system/etc/wifi/softap
Insert softap kernel modules:
# insmod tiap_drv.ko
Load the firmware and bring the interface up by issuing commands below.
# start wlan_ap_loader
# ifconfig tiap0 up
Ensure you have hostapd.conf file placed in /data/misc/wifi on target file system, then start hostapd by this command:
# start hostapd
Launch the WLAN SOFTAP CLI with supplicant and start executing tiap commands:
# tiap_cu -b
After Launching SOFTAP CLI, do the following configurations:
You can assign 10 digits WEP password (field highlighted).
#	/ m e c 13  1234567890 
#	/ m e s
#	/ m e r
#	/ q
#	/ m e c 18 1
#	/ m e c 20  psk12345                            //define wpa_passphrase
#	/ m e c 21 WPA-PSK                              //define wpa_key_mgmt
#	/ m e c 22 TKIP                                 //define wpa_pairwise=TKIP
#	/ m e c 23 TKIP                                 //define rsn_pairwise=TKIP
#	/ m e s                                         //save configuration
#	/ m e r                                         //restart softap
#	/ q
  1. Scan for the AP named as ‘AndroidAP’ and click on 'connect' and enter the WEP/WPA1-PSK password configured in previous steps. You should be now able to connect to portable hotspot.
  2. Browse the PC, connecting to Ethernet interface of SoftAP, by typing the PC IP address in browser.

[edit] Summary

OS Kernel: Linux® 2.6.35
WLAN Driver Version: MCP-WiLink_Driver_2.
WLAN Firmware Version: Rev
SOFT AP Driver Version: WiLink_Driver_AP_6.
SOFT AP Firmware Version: Rev
Hardware: OMAP4 Blaze(ES 2.2) (with 1283 PG 2.21 Connectivity device)

GIT Project: git://git.omapzoom.org/platform/hardware/ti/wlan.git
Commit Id: 263d8ce082a823185ea0e13d8ccd58491b13177a

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