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Can't link assemler code with c-code

I'm not that much into assemler, so I try to reuse existing asm-code as i2c-driver. I've found original Philips code for that. I try now to link it with c-code but get always linker warnings.

Any help appreciated!

NAME . . . . . . . . . USAGE    MODULE NAMES
--------------------------------------------

?C_START . . . . . . . CODE;    ** L51 GENERATED **  ?C_STARTUP
?C_STARTUP . . . . . . CODE;    ?C_STARTUP  ASMS
?IIC_TEST_DEVICE . . . CODE;    IIC_DRIVER
?IIC_TEST_DEVICE?BYTE. DATA;    IIC_DRIVER
?INIT_IIC?BYTE . . . . DATA;    IIC_DRIVER
?_IIC_WRITE_SUB?BYTE . ILLEGAL  ** UNRESOLVED **  ASMS
IIC_ERROR. . . . . . . BIT;     IIC_DRIVER
MAIN . . . . . . . . . CODE;    ASMS
_IIC_WRITE_SUB . . . . ILLEGAL  ** UNRESOLVED **  ASMS
_INIT_IIC. . . . . . . CODE;    IIC_DRIVER  ASMS

*** WARNING L1: UNRESOLVED EXTERNAL SYMBOL
    SYMBOL:  _IIC_WRITE_SUB
    MODULE:  asms.obj (ASMS)

*** WARNING L1: UNRESOLVED EXTERNAL SYMBOL
    SYMBOL:  ?_IIC_WRITE_SUB?BYTE
    MODULE:  asms.obj (ASMS)

*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNAL
    SYMBOL:  ?_IIC_WRITE_SUB?BYTE
    MODULE:  asms.obj (ASMS)
    ADDRESS: 0277H

*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNAL
    SYMBOL:  _IIC_WRITE_SUB
    MODULE:  asms.obj (ASMS)
    ADDRESS: 027FH

Here my c-code:

#include <REG552.H>
#include "iic.h"

#define myIICaddr 0x55		// my own i2c slave address


/*------------------------------------------------
MAIN C Function
------------------------------------------------*/
void main (void)
{
	unsigned char reg = 0;

	// Init routines
    Init_IIC(myIICaddr);

	// set control-register: stop counting, enable alarm
	reg = 0xC4;
	if(IIC_Write_Sub(RTC_ADDRESS, 1,  , 0x00) != I2C_OK)
	{
		// error
	}

	while (1)
	{
		;
	}
}

and the beginning of the asm-code:

$LIST
$REGISTERBANK (0,1)
$NOSYMBOLS
$PAGEWIDTH (130)
NAME    IIC_DRIVER


;
;       Includes: EQREG652.ASM
;
$NOLIST
$INCLUDE (EQREG652.ASM)
$LIST
;
; Public labels defined in this Module:
; *************************************
        public  ?IIC_Test_Device
        public  ?IIC_Test_Device?BYTE
        public  _Init_IIC
        public  ?Init_IIC?BYTE
;
$EJECT
;
...snipp...

?BI?IICBit      Segment Bit
                Rseg    ?BI?IICBit
;
                public  IIC_Error
IIC_Error:      dbit    1               ; IIC Error Bit
;
?BA?IICBitAdr       Segment Data BitAddressable
                Rseg    ?BA?IICBitAdr
;
IICCntrl:       ds      1               ; Bit Addressable IIC Control Register
;
?DT?IICPar          Segment Data
                Rseg    ?DT?IICPar

?IIC_Test_Device?BYTE:
?IIC_Write?BYTE:
?Init_IIC?BYTE:
;
SlaveAddress:   ds      1               ; Slave Address Include R/W
DataCount1:     ds      1               ; Block 1 Count
DataIndex1:     ds      1               ; Block 1 Transfer Buffer Address
SubAddress:     ds      1               ; Sub Address ( If Any )
DataCount2:     ds      1               ; Block 2 Count
DataIndex2:     ds      1               ; Block 2 Transfer Buffer Address
;
$EJECT
;
$EJECT
IICCode         Segment Code InBlock
                Rseg    IICCode
;

...snipp...

*****************************************************************
;       * Init_IIC:                                                     *
;       *    PROCEDURE ( OwnSlaveAddress ) ;                            *
;       *    DECLARE OwnSlaveAddress BYTE ;                             *
;       *                                                               *
;       *    Initialises the IIC SIO1 data, sets the Own Slave Address  *
;       *                                                               *
;       *    NOTE: This procedure must be called                        *
;       *          after power on before use of any other IIC procedure *
;       *****************************************************************
_Init_IIC:       mov     s1adr,SlaveAddress              ; Setup Own Slave Address
                mov     s1con,#NSTA_NSTO_AA             ; Assert Acknowledge on Slave Address
                mov     IICCntrl,#0                     ; Initialise Control / Status Register
                setb    es1                             ; Enable SIO1 Interrupt