Android USB/SD Card Summary

Android USB/SD Card Summary

Summary:

1. Set the default mode for connecting to USB and the device interface corresponding to the four modes

Charger: diag, serial_smd, rmnet_bam, adb

Ptp: ptp, adb

Mtp: mtp, adb

Mass storage: serial_smd, serial_tty, mass_storage

Diag indicates the diag port, serial_smd indicates the serial port, rmnet_bam indicates the network port, and adb indicates the adb port.

Set the default connection mode:

  boot_cust_mode=`cat /sys/class/android_usb/android0/device_mode`  usb_current_config=`getprop persist.sys.usb.config`  case $boot_cust_mode in    0) # ynn modify for user modeif [ $usb_current_config != mtp ]&&[ $usb_current_config != mtp,adb ]; thenecho boot_cust_mode is 0setprop persist.sys.usb.config mtpfi

2 user mode and test mode Conversion

 

By # * 20110606 # turn on and off the test switch, first set restart_reason in the kernel/drivers/power/reset/msm-poweroff.c

 #ifdef USER_TEST_MODE_SWITCHelse if (!strncmp(cmd, userswitch, 10)) {__raw_writel(0x77665506, restart_reason);}else if (!strncmp(cmd, testswitch, 10)) {__raw_writel(0x77665507, restart_reason);} #endif 

0x77665506 and 0x77665507 are defined in bootable/bootloader/lk/app/release T. c.

 #define USER_SWITCH_MODE   0x77665506 #define TEST_SWITCH_MODE   0x77665507

 

In restart T. c, set the restart mode:

 #ifdef HY_MODE_SWITCH // ynnelse if(reboot_mode == USER_SWITCH_MODE) {device.charger_screen_enabled=1;device.magic_poweron = 0x44332211;write_device_info(&device);}else if(reboot_mode == TEST_SWITCH_MODE) {                device.charger_screen_enabled=0;                device.magic_poweron = 0;                write_device_info(&device);                        } #endif

 #ifdef HY_MODE_SWITCH        if(0x44332211 == device.magic_poweron){        device.charger_screen_enabled=1;}else{        device.charger_screen_enabled=0;} #endif

The value of device. charger_screen_enabled is 1, indicating the user mode after restart.

 #ifdef HY_MODE_SWITCHif(device.charger_screen_enabled)cmdline_len += strlen(user_mode); #endif #ifdef HY_MODE_SWITCH        if(device.charger_screen_enabled)        {            src = user_mode;            if (have_cmdline) --dst;            have_cmdline = 1;            while ((*dst++ = *src++));        }  #endif