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i2c.h revision 1.2.6.2 
      1 /*	$NetBSD: i2c.h,v 1.2.6.2 2014/05/22 11:40:56 yamt Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2013 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Taylor R. Campbell.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #ifndef _LINUX_I2C_H_
     33 #define _LINUX_I2C_H_
     34 
     35 #include <sys/types.h>
     36 #include <sys/device_if.h>
     37 #include <sys/queue.h>		/* XXX include order botch: i2cvar.h needs */
     38 
     39 #include <dev/i2c/i2cvar.h>
     40 
     41 struct i2c_adapter;
     42 struct i2c_algorithm;
     43 struct i2c_msg;
     44 
     45 #define	I2C_NAME_SIZE	20
     46 
     47 #define	I2C_CLASS_DDC	0x01
     48 
     49 struct i2c_adapter {
     50 	char		 		name[I2C_NAME_SIZE];
     51 	const struct i2c_algorithm	*algo;
     52 	void				*algo_data;
     53 	int				retries;
     54 	struct module			*owner;
     55 	unsigned int			class;
     56 	struct {
     57 		device_t	parent;
     58 	}				dev;	/* XXX Kludge for intel_dp.  */
     59 };
     60 
     61 static inline int
     62 i2c_add_adapter(struct i2c_adapter *adapter __unused)
     63 {
     64 	return 0;
     65 }
     66 
     67 static inline void
     68 i2c_del_adapter(struct i2c_adapter *adapter __unused)
     69 {
     70 }
     71 
     72 struct i2c_msg {
     73 	i2c_addr_t	addr;
     74 	uint16_t	flags;
     75 	uint16_t	len;
     76 	uint8_t		*buf;
     77 };
     78 
     79 #define	I2C_M_RD		0x01
     80 #define	I2C_M_NOSTART		0x02
     81 
     82 #define	I2C_FUNC_I2C			0x01
     83 #define	I2C_FUNC_NOSTART		0x02
     84 #define	I2C_FUNC_SMBUS_EMUL		0x04
     85 #define	I2C_FUNC_SMBUS_READ_BLOCK_DATA	0x08
     86 #define	I2C_FUNC_SMBUS_BLOCK_PROC_CALL	0x10
     87 #define	I2C_FUNC_10BIT_ADDR		0x20
     88 
     89 struct i2c_algorithm {
     90 	int		(*master_xfer)(struct i2c_adapter *, struct i2c_msg *,
     91 			    int);
     92 	uint32_t	(*functionality)(struct i2c_adapter *);
     93 };
     94 
     95 /* XXX Make the nm output a little more greppable...  */
     96 #define	i2c_transfer	linux_i2c_transfer
     97 
     98 int	i2c_transfer(struct i2c_adapter *, struct i2c_msg *, int);
     99 
    100 #endif  /* _LINUX_I2C_H_ */
    101