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1      Scope of Document

This document describes how to port rtl8188eus driver to linux 4.14.y design.

2      Requiremen

2.1     Function Requirement

Suport usb wifi rtl8188eus working in sta mode under linux 4.14.y kernel version

2.2     Performance Requirement

NA

3      Hardware Overview

usb interface,pin map:

USB0_N

USB0_P

                  Figure 1 usb wifi rtl8188eus interface block diagram

4      Functional Description

4.1     Functional Block Diagram

It combines CMOSMAC,Baseband PHYand RF in a single chip for IEEE802.11/b/g/n compatible. It supports IEEE802.11i safety protocol, along with IEEE802.11e standard service quality. It supports the new data encryption on 64/128 bit WEP and safety mechanism on WPA-PSK/WPA2-PSK, WPA/WPA2.It can implement the wireless network function on the laptop/desktop/MID and other wireless devices easily

Figure 2 usb wifi rtl8188eus interface block diagram

4.2     RTL8188EUS

4.2.1 Overview

5      Porting

5.1     Kernel porting

+CONFIG_WIRELESS_EXT=y

+CONFIG_WEXT_PRIV=y

+CONFIG_WLAN_VENDOR_RSI=y

+CONFIG_CLKDEV_LOOKUP=y

+++ drivers/net/wireless/realtek/Kconfig   

+source "drivers/net/wireless/realtek/rtl8188eus/Kconfig"

+++ drivers/net/wireless/realtek/Makefile   

+obj-$(CONFIG_RTL8188EU)      += rtl8188eus/

get driver from : https://github.com/quickreflex/rtl8188eus

add include/autoconf.h for support ap+sta ,but ap driver is not compatible with linux.4.14.y kernversion, beause of manufacturer no longer maintain rtl8188eus drivers. So ap mode not work properly….

+109 #define CONFIG_CONCURRENT_MODE

5.2     Application Interface

After the usb wifi rtl8188eus driver was loaded , we can find wlan0 wlan1 network devices

Kernel message:

[  304.654082] 8188eu: loading out-of-tree module taints kernel.

[  304.690852] RTL871X: module init start

[  304.690875] RTL871X: rtl8188eu v4.3.0.8_13968.20150417

[  304.691129] RTL871X:

               usb_endpoint_descriptor(0):

[  304.691139] RTL871X: bLength=7

[  304.691145] RTL871X: bDescriptorType=5

[  304.691152] RTL871X: bEndpointAddress=81

[  304.691159] RTL871X: wMaxPacketSize=512

[  304.691166] RTL871X: bInterval=0

[  304.691173] RTL871X: RT_usb_endpoint_is_bulk_in = 1

[  304.691179] RTL871X:

               usb_endpoint_descriptor(1):

[  304.691184] RTL871X: bLength=7

[  304.691190] RTL871X: bDescriptorType=5

[  304.691195] RTL871X: bEndpointAddress=2

[  304.691201] RTL871X: wMaxPacketSize=512

[  304.691206] RTL871X: bInterval=0

[  304.691213] RTL871X: RT_usb_endpoint_is_bulk_out = 2

[  304.691219] RTL871X:

               usb_endpoint_descriptor(2):

[  304.691224] RTL871X: bLength=7

[  304.691230] RTL871X: bDescriptorType=5

[  304.691235] RTL871X: bEndpointAddress=3

[  304.691241] RTL871X: wMaxPacketSize=512

[  304.691246] RTL871X: bInterval=0

[  304.691252] RTL871X: RT_usb_endpoint_is_bulk_out = 3

[  304.691260] RTL871X: nr_endpoint=3, in_num=1, out_num=2

[  304.691266] RTL871X: USB_SPEED_HIGH

[  304.691397] RTL871X: CHIP TYPE: RTL8188E

[  304.691445] RTL871X: register rtw_netdev_ops to netdev_ops

[  304.691465] RTL871X: rtw_wdev_alloc(padapter=d0ee9000)

[  304.720692] RTL871X: Chip Version Info: CHIP_8188E_Normal_Chip_TSMC_A_CUT_1T1R_RomVer(0)

[  304.720711] RTL871X: RF_Type is 3!!

[  304.720726] RTL871X: _ConfigNormalChipOutEP_8188E OutEpQueueSel(0x05), OutEpNumber(2)

[  304.720926] RTL871X: EEPROM type is E-FUSE

[  304.720936] RTL871X: ====> _ReadAdapterInfo8188EU

[  304.721015] RTL871X: Boot from EFUSE, Autoload OK !

[  304.723461] RTL871X: SetHwReg8188EU: bMacPwrCtrlOn=1

[  304.723693] bFWReady == _FALSE call reset 8051...

[  304.724300] RTL871X: =====> _8051Reset88E(): 8051 reset success .

[  304.739727] RTL871X: efuse_read_phymap_from_txpktbuf bcnhead:0

[  304.740293] RTL871X: efuse_read_phymap_from_txpktbuf len:118, lenbak:118, aaa:118, aaabak:118

[  304.754846] RTL871X: efuse_read_phymap_from_txpktbuf read count:116

[  304.755152] RTL871X: EEPROM ID=0x8129

[  304.755165] RTL871X: VID = 0x0BDA, PID = 0x8179

[  304.755173] RTL871X: Customer ID: 0x00, SubCustomer ID: 0xCD

[  304.755185] RTL871X: Hal_ReadPowerSavingMode88E...bHWPwrPindetect(0)-bHWPowerdown(0) ,bSupportRemoteWakeup(1)

[  304.755192] RTL871X: ### PS params=>  power_mgnt(0),usbss_enable(0) ###

[  304.755202] RTL871X: ======= Path 0, Channel 1 =======

[  304.755208] RTL871X: Index24G_CCK_Base[0][1] = 0x21

[  304.755214] RTL871X: Index24G_BW40_Base[0][1] = 0x25

[  304.755219] RTL871X: ======= Path 0, Channel 2 =======

[  304.755225] RTL871X: Index24G_CCK_Base[0][2] = 0x21

[  304.755230] RTL871X: Index24G_BW40_Base[0][2] = 0x25

[  304.755236] RTL871X: ======= Path 0, Channel 3 =======

[  304.755242] RTL871X: Index24G_CCK_Base[0][3] = 0x21

[  304.755247] RTL871X: Index24G_BW40_Base[0][3] = 0x25

[  304.755252] RTL871X: ======= Path 0, Channel 4 =======

[  304.755258] RTL871X: Index24G_CCK_Base[0][4] = 0x21

[  304.755263] RTL871X: Index24G_BW40_Base[0][4] = 0x25

[  304.755269] RTL871X: ======= Path 0, Channel 5 =======

[  304.755274] RTL871X: Index24G_CCK_Base[0][5] = 0x21

[  304.755279] RTL871X: Index24G_BW40_Base[0][5] = 0x25

[  304.755285] RTL871X: ======= Path 0, Channel 6 =======

[  304.755290] RTL871X: Index24G_CCK_Base[0][6] = 0x21

[  304.755296] RTL871X: Index24G_BW40_Base[0][6] = 0x25

[  304.755301] RTL871X: ======= Path 0, Channel 7 =======

[  304.755307] RTL871X: Index24G_CCK_Base[0][7] = 0x21

[  304.755312] RTL871X: Index24G_BW40_Base[0][7] = 0x25

[  304.755317] RTL871X: ======= Path 0, Channel 8 =======

[  304.755323] RTL871X: Index24G_CCK_Base[0][8] = 0x21

[  304.755328] RTL871X: Index24G_BW40_Base[0][8] = 0x25

[  304.755333] RTL871X: ======= Path 0, Channel 9 =======

[  304.755339] RTL871X: Index24G_CCK_Base[0][9] = 0x21

[  304.755345] RTL871X: Index24G_BW40_Base[0][9] = 0x25

[  304.755350] RTL871X: ======= Path 0, Channel 10 =======

[  304.755356] RTL871X: Index24G_CCK_Base[0][10] = 0x21

[  304.755362] RTL871X: Index24G_BW40_Base[0][10] = 0x25

[  304.755367] RTL871X: ======= Path 0, Channel 11 =======

[  304.755373] RTL871X: Index24G_CCK_Base[0][11] = 0x21

[  304.755378] RTL871X: Index24G_BW40_Base[0][11] = 0x25

[  304.755383] RTL871X: ======= Path 0, Channel 12 =======

[  304.755389] RTL871X: Index24G_CCK_Base[0][12] = 0x1f

[  304.755395] RTL871X: Index24G_BW40_Base[0][12] = 0x23

[  304.755400] RTL871X: ======= Path 0, Channel 13 =======

[  304.755405] RTL871X: Index24G_CCK_Base[0][13] = 0x1f

[  304.755411] RTL871X: Index24G_BW40_Base[0][13] = 0x23

[  304.755417] RTL871X: ======= Path 0, Channel 14 =======

[  304.755422] RTL871X: Index24G_CCK_Base[0][14] = 0x1f

[  304.755428] RTL871X: Index24G_BW40_Base[0][14] = 0x23

[  304.755434] RTL871X: ======= TxCount 0 =======

[  304.755440] RTL871X: CCK_24G_Diff[0][0]= 0

[  304.755445] RTL871X: OFDM_24G_Diff[0][0]= 2

[  304.755451] RTL871X: BW20_24G_Diff[0][0]= 0

[  304.755457] RTL871X: BW40_24G_Diff[0][0]= 0

[  304.755461] RTL871X: EEPROMRegulatory = 0x0

[  304.755470] RTL871X: mlmepriv.ChannelPlan = 0x20

[  304.755476] RTL871X: CrystalCap: 0x10

[  304.755482] RTL871X: EEPROM Customer ID: 0x 0

[  304.755490] RTL871X: EEPROM : AntDivCfg = 0, TRxAntDivType = 3

[  304.755495] RTL871X: Board Type: 0x 0

[  304.755500] RTL871X: ThermalMeter = 0x1a

[  304.755508] RTL871X: <==== _ReadAdapterInfo8188EU in 30 ms

[  304.755746] RTL871X: init_channel_set ChannelPlan ID 20 Chan num:13 

[  304.756621] RTL871X: pwrctrlpriv.bSupportRemoteWakeup~~~~~~

[  304.756633] RTL871X: pwrctrlpriv.bSupportRemoteWakeup~~~[1]~~~

[  304.756645] RTL871X: can‘t get autopm:

[  304.756658] RTL871X: rtw_macaddr_cfg MAC Address  = 00:11:7f:36:05:51

[  304.756668] RTL871X: bDriverStopped:1, bSurpriseRemoved:0, bup:0, hw_init_completed:0

[  304.756749] RTL871X: register rtw_netdev_ops to netdev_ops

[  304.756763] RTL871X: register rtw_netdev_if2_ops to netdev_ops

[  304.756848] RTL871X: rtw_wdev_alloc(padapter=d0f52000)

[  304.787825] RTL871X: Chip Version Info: CHIP_8188E_Normal_Chip_TSMC_A_CUT_1T1R_RomVer(0)

[  304.787844] RTL871X: RF_Type is 3!!

[  304.787860] RTL871X: _ConfigNormalChipOutEP_8188E OutEpQueueSel(0x05), OutEpNumber(2)

[  304.799518] RTL871X: init_channel_set ChannelPlan ID 20 Chan num:13 

[  304.800371] RTL871X: rtw_ndev_init(wlan0)

[  304.822284] RTL871X: cfg80211_rtw_get_txpower

[  304.835936] RTL871X: cfg80211_rtw_get_txpower

[  304.844868] RTL871X: cfg80211_rtw_get_txpower

[  304.845345] RTL871X: cfg80211_rtw_get_txpower

[  304.845571] RTL871X: _rtw_drv_register_netdev, MAC Address (if1) = 00:11:7f:36:05:51

[  304.845630] RTL871X: rtw_ndev_init(wlan1)

[  304.846650] RTL871X: cfg80211_rtw_get_txpower

[  304.853231] RTL871X: cfg80211_rtw_get_txpower

[  304.853920] RTL871X: cfg80211_rtw_get_txpower

[  304.854138] RTL871X: _rtw_drv_register_netdev, MAC Address (if2) = 02:11:7f:36:05:51

[  304.854977] pwm-backlight backlight: GPIO lookup for consumer enable

[  304.854990] pwm-backlight backlight: using device tree for GPIO lookup

[  304.855016] of_get_named_gpiod_flags: can‘t parse ‘enable-gpios‘ property of node ‘/backlight[0]‘

[  304.855029] of_get_named_gpiod_flags: can‘t parse ‘enable-gpio‘ property of node ‘/backlight[0]‘

[  304.855038] pwm-backlight backlight: using lookup tables for GPIO lookup

[  304.855049] pwm-backlight backlight: lookup for GPIO enable failed

[  304.855077] pwm-backlight backlight: backlight supply power not found, using dummy regulator

[  304.856092] usbcore: registered new interface driver rtl8188eu

[  304.856103] RTL871X: module init ret=0

[  305.247860] RTL871X: cfg80211_rtw_get_txpower

6    Follow-up

Sta mode test method:

root@IoTP:~# /etc/init.d/8188euSta connect panzidong 12345678

Starting 8188eu sta connectAPDRIVER = 8188eu

connect to  AP_SSID : panzidong, AP_PASSWORD : 12345678

Successfully initialized wpa_supplicant

.

root@IoTP:~# script_runreason: /usr/libexec/dhcpcd-run-hooks: WEXITSTATUS 127

script_runreason: /usr/libexec/dhcpcd-run-hooks: WEXITSTATUS 127

wlan1: waiting for carrier

wlan1: carrier acquired

wlan1: adding address fe80::bede:af04:e62a:30c8

script_runreason: /usr/libexec/dhcpcd-run-hooks: WEXITSTATUS 127

DUID 00:01:00:01:1e:4f:73:1f:f8:36:9b:0b:cc:1b

wlan1: IAID 7f:36:05:51

wlan1: soliciting an IPv6 router

wlan1: soliciting a DHCP lease

root@IoTP:~# wlan1: offered 172.20.10.14 from 172.20.10.1 `panzidong‘

wlan1: probing address 172.20.10.14/28

root@IoTP:~# wlan1: leased 172.20.10.14 for 85536 seconds

wlan1: adding route to 172.20.10.0/28

wlan1: adding default route via 172.20.10.1

script_runreason: /usr/libexec/dhcpcd-run-hooks: WEXITSTATUS 127

forked to background, child pid 1568

root@IoTP:~# ifconfig wlan1

wlan1     Link encap:Ethernet  HWaddr 02:11:7f:36:05:51 

          inet addr:172.20.10.14  Bcast:172.20.10.15  Mask:255.255.255.240

          inet6 addr: fe80::bede:af04:e62a:30c8/64 Scope:Link

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:4 errors:0 dropped:53 overruns:0 frame:0

          TX packets:19 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000

          RX bytes:1078 (1.0 KB)  TX bytes:2950 (2.9 KB)

am335x system upgrade usb wifi rtl8188eus(十九)

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原文地址：https://www.cnblogs.com/lianghong881018/p/10430830.html