MTK6592的modem---5.PPP拨号上网

1. 查看ppp的驱动是否有
cong@msi:/work/mtk/78P01$ vi mediatek/config/mt6592/autoconfig/kconfig/platform

1099 #
1100 # CAIF transport drivers
1101 #
1102 # CONFIG_ETHERNET is not set
1103 # CONFIG_PHYLIB is not set
1104 # CONFIG_MICREL_KS8995MA is not set
1105 CONFIG_PPP=y
1106 CONFIG_PPP_BSDCOMP=y
1107 CONFIG_PPP_DEFLATE=y
1108 CONFIG_PPP_FILTER=y
1109 CONFIG_PPP_MPPE=y
1110 CONFIG_PPP_MULTILINK=y
1111 CONFIG_PPPOE=y
1112 CONFIG_PPPOLAC=y
1113 CONFIG_PPPOPNS=y
1114 CONFIG_PPP_ASYNC=y
1115 CONFIG_PPP_SYNC_TTY=y
1116 # CONFIG_SLIP is not set
1117 CONFIG_SLHC=y

2. ppp中chat的移植
a. android下pppd这个在extern/ppp/pppd下己经有了,不过mtk会编译出pppd_dt与pppd,
在调试时发现pppd_dt在打开/dev/ppp时,会报权限错误，所以我用的是pppd
b. chat这个工具需要下载ppp-2.4.5.tar.gz的源码进制编译
好在只有一个chat.c文件移植起来很简单
c. chat移植的Android.mk

cong@msi:/work/mtk/78P01/conggprs/myppp/ppp-2.4.5$ cat chat/Android.mk
LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)

local_src_files:= \
    chat.c
#######################################
# pure pppd binary
CDEF1= -DTERMIOS           # Use the termios structure
CDEF2= -DSIGTYPE=void          # Standard definition
CDEF3= -UNO_SLEEP          # Use the usleep function
CDEF4= -DFNDELAY=O_NDELAY      # Old name value
CDEFS= $(CDEF1) $(CDEF2) $(CDEF3) $(CDEF4)

COPTS= -O2 -g -pipe
CFLAGS= $(COPTS) $(CDEFS)

LOCAL_SRC_FILES += $(local_src_files)

LOCAL_SHARED_LIBRARIES := \
    libcutils libcrypto

LOCAL_C_INCLUDES := \
    $(LOCAL_PATH)/include

LOCAL_CFLAGS := -DANDROID_CHANGES -DCHAPMS=1 -DMPPE=1 -Iexternal/openssl/include

LOCAL_CFLAGS += -DUSE_NEG_ADDR $(CFLAGS)


ifeq ($(EVDO_DT_VIA_SUPPORT),yes)
LOCAL_CFLAGS += -D__VIA_PPPD_DOWN__
endif

LOCAL_MODULE:= chat

include $(BUILD_EXECUTABLE)

d. chat及Andorid.mk打包 
chat.rar(下载后改名为chat.tar.gz)

---

3.配置文件
在主机上写好配置文件，一会导到手机的指定目录中去
3.1
cong@msi:/work/mtk/78P01$ tree conggprs/
conggprs/
├── chap-secrets
├── gprs
├── gprs-connect-chat
└── pap-secrets
调用时pppd call gprs
call后面的gprs就是在手机上的/etc/ppp/peers/gprs这个脚本
(注意:a.若没有peers这个目录就手动创建一个
        b.手机上/etc目录与/system/etc目录是同一个目录,解决了initramfs不能写的问题
3.2 gprs
这个名字必须与call后面的名字一样

cong@msi:/work/mtk/78P01/conggprs$ cat gprs
/dev/ttyMT3
115200
nocrtscts
modem
#noauth
#auth
#-pap
#+chap
#lock
debug
nodetach
#hide-password
usepeerdns
noipdefault
defaultroute
user cmnet
#user smsong
0.0.0.0:0.0.0.0
ipcp-accept-local
#ipcp-accept-remote
#lcp-echo-failure  12
#lcp-echo-interval 3
noccp
#novj
#novjccomp
persist
connect '/system/bin/chat -v -f /system/etc/ppp/gprs-connect-chat

3.3 connect
connect 指定了chat的配置文件是gprs-connect-chat,
所以这个名字也得叫gprs-connect-chat

cong@msi:/work/mtk/78P01/conggprs$ cat gprs-connect-chat
TIMEOUT 5
ABORT 'r\nBUSY\r\n'
ABORT '\r\nNO ANSWER\r\n'
ABORT '\r\nRINGING\r\n\r\nRINGING\r\n'
#'' AT
#'OK-+++\c-OK' ATH0
'' AT\r\n
OK              ATS0=0\r\n
OK              ATE0V1\r\n
OK              AT+CGDCONT=1,"IP","CMNET"\r\n
OK              ATDT*99***1#\r\n
CONNECT ''
cong@msi:/work/mtk/78P

3.3

cong@msi:/work/mtk/78P01/conggprs$ cat chap-secrets
# Secrets for authentication using CHAP
# client    server     secret                    IP addresses
'' * '' *

3.4

cong@msi:/work/mtk/78P01/conggprs$ cat pap-secrets
# Secrets for authentication using PAP
# client    server     secret                    IP addresses
cmnet * cmnet *

配置文件打包  
conggprs.rar(下载后改名为conggprs.tar.gz)
3.5 编译脚本

#!/bin/sh
make_ppp()
{
    ./mk -t mm ./external/ppp/pppd/
    adb remount
    adb push out/target/product/mt92_wet_jb9/system/bin/pppd_dt /system/bin/pppd_dt_mod
    adb push out/target/product/mt92_wet_jb9/system/bin/pppd /system/bin/pppd
    adb shell sync
}
make_chat()
{
    ./mk -t mm ./conggprs/myppp/ppp-2.4.5/chat
    adb remount
    adb push out/target/product/mt92_wet_jb9/system/bin/chat /system/bin/chat
    adb shell sync
}

make_ppp_conf()
{
    adb remount
    adb push ./conggprs/gprs-connect-chat /system/etc/ppp/
    adb push ./conggprs/gprs /system/etc/ppp/peers/
    adb push ./conggprs/pap-secrets /system/etc/ppp/
    adb push ./conggprs/chap-secrets /system/etc/ppp/
    adb shell sync
}
case "$1" in
    *)
        make_ppp
        make_chat
        make_ppp_conf
        ;;
esac

---

4. 开发板上的配置

root@78P01:/system/etc/ppp # ls -l
-rw-rw-rw- root     root          128 2015-09-17 10:36 chap-secrets
-rw------- root     root            0 2015-09-17 11:30 connect-errors
-rw-rw-rw- root     root          297 2015-09-17 16:46 gprs-connect-chat
-r-xr-xr-x root     root          421 2015-07-14 20:56 ip-down
-r-xr-xr-x root     root          963 2015-07-14 20:56 ip-up
-r-xr-xr-x root     root         5440 2015-07-14 21:32 ip-up-vpn
-rw-rw-rw- root     root          127 2015-09-17 10:36 pap-secrets
drwxrwxrwx root     root              2015-09-17 17:38 peers
root@78P01:/system/etc/ppp # ls -l peers/
-rw-rw-rw- root     root          411 2015-09-17 11:56 gprs

运行:
16|root@78P01:/ # pppd call gprs
运行成功后运行busybox ifconfig会看到有ppp0
5.注意
执行流程:
    pppd call gprs      -->先解析gprs脚本
    gprs脚本中的connect -->调用chat命令解析gprs-connnect-chat脚本
5.2 设置dns :   setprop net.dns1   8.8.8.8