i2c.h

ARM S3C2410 linux2.4 内核源码

/* $Id$
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1992 - 1997, 2000 Silicon Graphics, Inc.
 * Copyright (C) 2000 by Colin Ngam
 */
#ifndef _ASM_SN_KSYS_I2C_H
#define _ASM_SN_KSYS_I2C_H

#if _STANDALONE
# include "rtc.h"
#else
# define rtc_time()	(GET_LOCAL_RTC * NSEC_PER_CYCLE / 1000)
# define rtc_sleep	us_delay
# define rtc_time_t	uint64_t
#endif

typedef u_char			i2c_addr_t;	/* 7-bit address            */

int		i2c_init(nasid_t);

int		i2c_probe(nasid_t nasid, rtc_time_t timeout);

int		i2c_arb(nasid_t, rtc_time_t timeout, rtc_time_t *token_start);

int		i2c_master_xmit(nasid_t,
				i2c_addr_t addr,
				u_char *buf,
				int len_max,
				int *len_ptr,
				rtc_time_t timeout,
				int only_if_message);

int		i2c_master_recv(nasid_t,
				i2c_addr_t addr,
				u_char *buf,
				int len_max,
				int *len_ptr,
				int emblen,
				rtc_time_t timeout,
				int only_if_message);

int		i2c_master_xmit_recv(nasid_t,
				     i2c_addr_t addr,
				     u_char *xbuf,
				     int xlen_max,
				     int *xlen_ptr,
				     u_char *rbuf,
				     int rlen_max,
				     int *rlen_ptr,
				     int emblen,
				     rtc_time_t timeout,
				     int only_if_message);

char	       *i2c_errmsg(int code);

/*
 * Error codes
 */

#define I2C_ERROR_NONE		 0
#define I2C_ERROR_INIT		-1	/* Initialization error             */
#define I2C_ERROR_STATE		-2	/* Unexpected chip state	    */
#define I2C_ERROR_NAK		-3	/* Addressed slave not responding   */
#define I2C_ERROR_TO_ARB	-4	/* Timeout waiting for sysctlr arb  */
#define I2C_ERROR_TO_BUSY	-5	/* Timeout waiting for busy bus     */
#define I2C_ERROR_TO_SENDA	-6	/* Timeout sending address byte     */
#define I2C_ERROR_TO_SENDD	-7	/* Timeout sending data byte        */
#define I2C_ERROR_TO_RECVA	-8	/* Timeout receiving address byte   */
#define I2C_ERROR_TO_RECVD	-9	/* Timeout receiving data byte      */
#define I2C_ERROR_NO_MESSAGE	-10	/* No message was waiting	    */
#define I2C_ERROR_NO_ELSC	-11	/* ELSC is disabled for access 	    */ 	

#endif /* _ASM_SN_KSYS_I2C_H */