disasm

; ======================================================
; Subroutine sceUsbAcc_internal_79A1C743 - Address 0x00000000 - Aliases: sceUsbAcc_79A1C743, sceUsbAcc_driver_79A1C743
; Exported in sceUsbAcc_internal
; Exported in sceUsbAcc
; Exported in sceUsbAcc_driver
sceUsbAcc_internal_79A1C743:
	0x00000000: 0x27BDFFF0 '...'' - addiu      $sp, $sp, -16
	0x00000004: 0xAFB10004 '....' - sw         $s1, 4($sp)
	0x00000008: 0xAFB00000 '....' - sw         $s0, 0($sp)
	0x0000000C: 0xAFBF0008 '....' - sw         $ra, 8($sp)
	0x00000010: 0x0C00022A '*...' - jal        InterruptManagerForKernel_092968F4
	0x00000014: 0x00000000 '....' - nop        
; Data ref 0x00000D53
	0x00000018: 0x3C030000 '...<' - lui        $v1, 0x0
; Data ref 0x00000D53
	0x0000001C: 0x90640D53 'S.d.' - lbu        $a0, 3411($v1)
	0x00000020: 0x00408821 '!.@.' - move       $s1, $v0
	0x00000024: 0x3C028024 '$..<' - lui        $v0, 0x8024
	0x00000028: 0x14800009 '....' - bnez       $a0, loc_00000050
	0x0000002C: 0x34503007 '.0P4' - ori        $s0, $v0, 0x3007

loc_00000030:		; Refs: 0x00000060 
	0x00000030: 0x0C00022C ',...' - jal        InterruptManagerForKernel_5F10D406
	0x00000034: 0x02202021 '!  .' - move       $a0, $s1
	0x00000038: 0x02001021 '!...' - move       $v0, $s0
	0x0000003C: 0x8FBF0008 '....' - lw         $ra, 8($sp)
	0x00000040: 0x8FB10004 '....' - lw         $s1, 4($sp)
	0x00000044: 0x8FB00000 '....' - lw         $s0, 0($sp)
	0x00000048: 0x03E00008 '....' - jr         $ra
	0x0000004C: 0x27BD0010 '...'' - addiu      $sp, $sp, 16

loc_00000050:		; Refs: 0x00000028 
	0x00000050: 0x0C00023E '>...' - jal        sceUsbBus_driver_8A3EB5D2
	0x00000054: 0x00008021 '!...' - move       $s0, $zr
	0x00000058: 0x3C058024 '$..<' - lui        $a1, 0x8024
	0x0000005C: 0x34A43701 '.7.4' - ori        $a0, $a1, 0x3701
	0x00000060: 0x0800000C '....' - j          loc_00000030
	0x00000064: 0x0082800A '....' - movz       $s0, $a0, $v0

usbacc.c

#define STATUS_CODE_MAJOR 0x80240000
#define USB_ACC_STATUS(x) (STATUS_CODE_MAJOR | x)

static unsigned char g_00000D53; //I think this is used as a bool

//returns a status code?
unsigned int sceUsbAcc_internal_79A1C743(void)
{
    unsigned int ret;
    unsigned int intr = sceKernelCpuSuspendIntr();

    if ( (g_00000D53) && (sceUsbBus_driver_8A3EB5D2() == 0) )
        ret = USB_ACC_STATUS(0x3701);
    else
        ret = USB_ACC_STATUS(0x3007);

    sceKernelCpuResumeIntr(intr);
    return ret;
}