How to add autoincrement SLNO in store procedure .. please help

ALTER PROCEDURE [dbo].SP_CREATEDEVMASTER
(
	@SLNO bigint,
	@SERIAL_NO nvarchar(30),
	@DEVICE_NO nvarchar(6),
	@MODELCODE int,
	@WARRANTY nvarchar(3),
	@STCODE int,
	@REMARKS nvarchar(100),
	@PROCESSOR nvarchar(10),
	@RAM nvarchar(10),
	@HARDDISK nvarchar(10),
	@DEVCODE int,
	@FLG_TYPE bit,
	@PRICE money
)
AS
	SET NOCOUNT OFF;
INSERT INTO [TBL_DEVMASTER] ([SLNO], [SERIAL_NO], [DEVICE_NO], [MODELCODE], [WARRANTY], [STCODE], [REMARKS], [PROCESSOR], [RAM], [HARDDISK], [DEVCODE], [FLG_TYPE], [PRICE]) VALUES (@SLNO, @SERIAL_NO, @DEVICE_NO, @MODELCODE, @WARRANTY, @STCODE, @REMARKS, @PROCESSOR, @RAM, @HARDDISK, @DEVCODE, @FLG_TYPE, @PRICE);
	
SELECT SLNO, SERIAL_NO, DEVICE_NO, MODELCODE, WARRANTY, STCODE, REMARKS, PROCESSOR, RAM, HARDDISK, DEVCODE, FLG_TYPE, PRICE FROM TBL_DEVMASTER WHERE (SLNO = @SLNO)