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/* ------------------------------------------------------------------------- */

/*                                                                           */

/* i2c.h - definitions for the i2c-bus interface                             */

/*                                                                           */

/* ------------------------------------------------------------------------- */

/*   Copyright (C) 1995-2000 Simon G. Vogl

    This program is free software; you can redistribute it and/or modify

    it under the terms of the GNU General Public License as published by

    the Free Software Foundation; either version 2 of the License, or

    (at your option) any later version.

    This program is distributed in the hope that it will be useful,

    but WITHOUT ANY WARRANTY; without even the implied warranty of

    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License

    along with this program; if not, write to the Free Software

    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.                */

/* ------------------------------------------------------------------------- */

/* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and

   Frodo Looijaard <frodol@dds.nl> */

/* $Id: i2c.h,v 1.1 2003-05-22 10:25:25 giacomo Exp $ */

#ifndef I2C_H

#define I2C_H

#define I2C_DATE "20010830"

#define I2C_VERSION "2.6.1"

#include "drivers/i2c-id.h"     /* id values of adapters et. al.        */

#include <sys/types.h>

#include "drivers/compbttv.h"

struct i2c_msg;

/* --- General options ------------------------------------------------ */

#define I2C_ALGO_MAX    4               /* control memory consumption   */

#define I2C_ADAP_MAX    16

#define I2C_DRIVER_MAX  16

#define I2C_CLIENT_MAX  32

#define I2C_DUMMY_MAX 4

struct i2c_algorithm;

struct i2c_adapter;

struct i2c_client;

struct i2c_driver;

struct i2c_client_address_data;

union i2c_smbus_data;

/*

 * The master routines are the ones normally used to transmit data to devices

 * on a bus (or read from them). Apart from two basic transfer functions to

 * transmit one message at a time, a more complex version can be used to

 * transmit an arbitrary number of messages without interruption.

 */

extern int i2c_master_send(struct i2c_client *,const char* ,int);

extern int i2c_master_recv(struct i2c_client *,char* ,int);

/* Transfer num messages.

 */

extern int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg msg[],int num);

/*

 * Some adapter types (i.e. PCF 8584 based ones) may support slave behaviuor.

 * This is not tested/implemented yet and will change in the future.

 */

extern int i2c_slave_send(struct i2c_client *,char*,int);

extern int i2c_slave_recv(struct i2c_client *,char*,int);

/* This is the very generalized SMBus access routine. You probably do not

   want to use this, though; one of the functions below may be much easier,

   and probably just as fast.

   Note that we use i2c_adapter here, because you do not need a specific

   smbus adapter to call this function. */

extern __s32 i2c_smbus_xfer (struct i2c_adapter * adapter, __u16 addr,

                           unsigned short flags,

                           char read_write, __u8 command, int size,

                           union i2c_smbus_data * data);

/* Now follow the 'nice' access routines. These also document the calling

   conventions of smbus_access. */

extern __s32 i2c_smbus_write_quick(struct i2c_client * client, __u8 value);

extern __s32 i2c_smbus_read_byte(struct i2c_client * client);

extern __s32 i2c_smbus_write_byte(struct i2c_client * client, __u8 value);

extern __s32 i2c_smbus_read_byte_data(struct i2c_client * client, __u8 command);

extern __s32 i2c_smbus_write_byte_data(struct i2c_client * client,

                                     __u8 command, __u8 value);

extern __s32 i2c_smbus_read_word_data(struct i2c_client * client, __u8 command);

extern __s32 i2c_smbus_write_word_data(struct i2c_client * client,

                                     __u8 command, __u16 value);

extern __s32 i2c_smbus_process_call(struct i2c_client * client,

                                  __u8 command, __u16 value);

/* Returns the number of read bytes */

extern __s32 i2c_smbus_read_block_data(struct i2c_client * client,

                                     __u8 command, __u8 *values);

extern __s32 i2c_smbus_write_block_data(struct i2c_client * client,

                                      __u8 command, __u8 length,

                                      __u8 *values);

extern __s32 i2c_smbus_write_i2c_block_data(struct i2c_client * client,

                                          __u8 command, __u8 length,

                                          __u8 *values);

/*

 * A driver is capable of handling one or more physical devices present on

 * I2C adapters. This information is used to inform the driver of adapter

 * events.

 */

struct i2c_driver {

        char name[32];

        int id;

        unsigned int flags;             /* div., see below              */

        /* Notifies the driver that a new bus has appeared. This routine

         * can be used by the driver to test if the bus meets its conditions

         * & seek for the presence of the chip(s) it supports. If found, it

         * registers the client(s) that are on the bus to the i2c admin. via

         * i2c_attach_client.

         */

        int (*attach_adapter)(struct i2c_adapter *);

        /* tells the driver that a client is about to be deleted & gives it

         * the chance to remove its private data. Also, if the client struct

         * has been dynamically allocated by the driver in the function above,

         * it must be freed here.

         */

        int (*detach_client)(struct i2c_client *);

        /* a ioctl like command that can be used to perform specific functions

         * with the device.

         */

        int (*command)(struct i2c_client *client,unsigned int cmd, void *arg);

        /* These two are mainly used for bookkeeping & dynamic unloading of

         * kernel modules. inc_use tells the driver that a client is being  

         * used by another module & that it should increase its ref. counter.

         * dec_use is the inverse operation.

         * NB: Make sure you have no circular dependencies, or else you get a

         * deadlock when trying to unload the modules.

        * You should use the i2c_{inc,dec}_use_client functions instead of

        * calling this function directly.

         */

        void (*inc_use)(struct i2c_client *client);

        void (*dec_use)(struct i2c_client *client);

};

/*

 * i2c_client identifies a single device (i.e. chip) that is connected to an

 * i2c bus. The behaviour is defined by the routines of the driver. This

 * function is mainly used for lookup & other admin. functions.

 */

struct i2c_client {

        char name[32];

        int id;

        unsigned int flags;             /* div., see below              */

        unsigned int addr;              /* chip address - NOTE: 7bit    */

                                        /* addresses are stored in the  */

                                        /* _LOWER_ 7 bits of this char  */

        /* addr: unsigned int to make lm_sensors i2c-isa adapter work

          more cleanly. It does not take any more memory space, due to

          alignment considerations */

        struct i2c_adapter *adapter;    /* the adapter we sit on        */

        struct i2c_driver *driver;      /* and our access routines      */

        void *data;                     /* for the clients              */

        int usage_count;                /* How many accesses currently  */

                                        /* to the client                */

};

/*

 * The following structs are for those who like to implement new bus drivers:

 * i2c_algorithm is the interface to a class of hardware solutions which can

 * be addressed using the same bus algorithms - i.e. bit-banging or the PCF8584

 * to name two of the most common.

 */

struct i2c_algorithm {

        char name[32];                          /* textual description  */

        unsigned int id;

        /* If an adapter algorithm can't to I2C-level access, set master_xfer

           to NULL. If an adapter algorithm can do SMBus access, set

           smbus_xfer. If set to NULL, the SMBus protocol is simulated

           using common I2C messages */

        int (*master_xfer)(struct i2c_adapter *adap,struct i2c_msg msgs[],

                           int num);

        int (*smbus_xfer) (struct i2c_adapter *adap, __u16 addr,

                           unsigned short flags, char read_write,

                           __u8 command, int size, union i2c_smbus_data * data);

        /* --- these optional/future use for some adapter types.*/

        int (*slave_send)(struct i2c_adapter *,char*,int);

        int (*slave_recv)(struct i2c_adapter *,char*,int);

        /* --- ioctl like call to set div. parameters. */

        int (*algo_control)(struct i2c_adapter *, unsigned int, unsigned long);

        /* To determine what the adapter supports */

        __u32 (*functionality) (struct i2c_adapter *);

};

/*

 * i2c_adapter is the structure used to identify a physical i2c bus along

 * with the access algorithms necessary to access it.

 */

struct i2c_adapter {

        char name[32];  /* some useful name to identify the adapter     */

        unsigned int id;/* == is algo->id | hwdep.struct->id,           */

                        /* for registered values see below              */

        struct i2c_algorithm *algo;/* the algorithm to access the bus   */

        void *algo_data;

        /* --- These may be NULL, but should increase the module use count */

        void (*inc_use)(struct i2c_adapter *);

        void (*dec_use)(struct i2c_adapter *);

        /* --- administration stuff. */

        int (*client_register)(struct i2c_client *);

        int (*client_unregister)(struct i2c_client *);

        void *data;     /* private data for the adapter                 */

                        /* some data fields that are used by all types  */

                        /* these data fields are readonly to the public */

                        /* and can be set via the i2c_ioctl call        */

                        /* data fields that are valid for all devices   */

        unsigned int flags;/* flags specifying div. data                */

        struct i2c_client *clients[I2C_CLIENT_MAX];

        int client_count;

        int timeout;

        int retries;

};

/*flags for the driver struct: */

#define I2C_DF_NOTIFY   0x01            /* notify on bus (de/a)ttaches  */

#define I2C_DF_DUMMY    0x02            /* do not connect any clients */

/*flags for the client struct: */

#define I2C_CLIENT_ALLOW_USE            0x01    /* Client allows access */

#define I2C_CLIENT_ALLOW_MULTIPLE_USE   0x02    /* Allow multiple access-locks */

                                                /* on an i2c_client */

/* i2c_client_address_data is the struct for holding default client

 * addresses for a driver and for the parameters supplied on the

 * command line

 */

struct i2c_client_address_data {

        unsigned short *normal_i2c;

        unsigned short *normal_i2c_range;

        unsigned short *probe;

        unsigned short *probe_range;

        unsigned short *ignore;

        unsigned short *ignore_range;

        unsigned short *force;

};

/* Internal numbers to terminate lists */

#define I2C_CLIENT_END 0xfffe

/* The numbers to use to set I2C bus address */

#define ANY_I2C_BUS 0xffff

/* The length of the option lists */

#define I2C_CLIENT_MAX_OPTS 48

/* ----- functions exported by i2c.o */

/* administration...

 */

extern int i2c_add_adapter(struct i2c_adapter *);

extern int i2c_del_adapter(struct i2c_adapter *);

extern int i2c_add_driver(struct i2c_driver *);

extern int i2c_del_driver(struct i2c_driver *);

extern int i2c_attach_client(struct i2c_client *);

extern int i2c_detach_client(struct i2c_client *);

/* Only call these if you grab a resource that makes unloading the

   client and the adapter it is on completely impossible. Like when a

   /proc directory is entered. */

extern void i2c_inc_use_client(struct i2c_client *);

extern void i2c_dec_use_client(struct i2c_client *);

/* New function: This is to get an i2c_client-struct for controlling the

   client either by using i2c_control-function or having the

   client-module export functions that can be used with the i2c_client

   -struct. */

extern struct i2c_client *i2c_get_client(int driver_id, int adapter_id,

                                        struct i2c_client *prev);

/* Should be used with new function

   extern struct i2c_client *i2c_get_client(int,int,struct i2c_client *);

   to make sure that client-struct is valid and that it is okay to access

   the i2c-client.

   returns -EACCES if client doesn't allow use (default)

   returns -EBUSY if client doesn't allow multiple use (default) and

   usage_count >0 */

extern int i2c_use_client(struct i2c_client *);

extern int i2c_release_client(struct i2c_client *);

/* returns -EBUSY if address has been taken, 0 if not. Note that the only

   other place at which this is called is within i2c_attach_client; so

   you can cheat by simply not registering. Not recommended, of course! */

extern int i2c_check_addr (struct i2c_adapter *adapter, int addr);

/* Detect function. It iterates over all possible addresses itself.

 * It will only call found_proc if some client is connected at the

 * specific address (unless a 'force' matched);

 */

typedef int i2c_client_found_addr_proc (struct i2c_adapter *adapter,

                                     int addr, unsigned short flags,int kind);

extern int i2c_probe(struct i2c_adapter *adapter,

                struct i2c_client_address_data *address_data,

                i2c_client_found_addr_proc *found_proc);

/* An ioctl like call to set div. parameters of the adapter.

 */

extern int i2c_control(struct i2c_client *,unsigned int, unsigned long);

/* This call returns a unique low identifier for each registered adapter,

 * or -1 if the adapter was not registered.

 */

extern int i2c_adapter_id(struct i2c_adapter *adap);

/* Return the functionality mask */

extern __u32 i2c_get_functionality (struct i2c_adapter *adap);

/* Return 1 if adapter supports everything we need, 0 if not. */

extern int i2c_check_functionality (struct i2c_adapter *adap, __u32 func);

/*

 * I2C Message - used for pure i2c transaction, also from /dev interface

 */

struct i2c_msg {

        __u16 addr;     /* slave address                        */

        unsigned short flags;          

#define I2C_M_TEN       0x10    /* we have a ten bit chip address       */

#define I2C_M_RD        0x01

#define I2C_M_NOSTART   0x4000

#define I2C_M_REV_DIR_ADDR      0x2000

        short len;              /* msg length                           */

        char *buf;              /* pointer to msg data                  */

};

/* To determine what functionality is present */

#define I2C_FUNC_I2C                    0x00000001

#define I2C_FUNC_10BIT_ADDR             0x00000002

#define I2C_FUNC_PROTOCOL_MANGLING      0x00000004 /* I2C_M_{REV_DIR_ADDR,NOSTART} */

#define I2C_FUNC_SMBUS_QUICK            0x00010000 

#define I2C_FUNC_SMBUS_READ_BYTE        0x00020000 

#define I2C_FUNC_SMBUS_WRITE_BYTE       0x00040000 

#define I2C_FUNC_SMBUS_READ_BYTE_DATA   0x00080000 

#define I2C_FUNC_SMBUS_WRITE_BYTE_DATA  0x00100000 

#define I2C_FUNC_SMBUS_READ_WORD_DATA   0x00200000 

#define I2C_FUNC_SMBUS_WRITE_WORD_DATA  0x00400000 

#define I2C_FUNC_SMBUS_PROC_CALL        0x00800000 

#define I2C_FUNC_SMBUS_READ_BLOCK_DATA  0x01000000 

#define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA 0x02000000 

#define I2C_FUNC_SMBUS_READ_I2C_BLOCK   0x04000000 /* New I2C-like block */

#define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK  0x08000000 /* transfer */

#define I2C_FUNC_SMBUS_BYTE I2C_FUNC_SMBUS_READ_BYTE | \

                            I2C_FUNC_SMBUS_WRITE_BYTE

#define I2C_FUNC_SMBUS_BYTE_DATA I2C_FUNC_SMBUS_READ_BYTE_DATA | \

                                 I2C_FUNC_SMBUS_WRITE_BYTE_DATA

#define I2C_FUNC_SMBUS_WORD_DATA I2C_FUNC_SMBUS_READ_WORD_DATA | \

                                 I2C_FUNC_SMBUS_WRITE_WORD_DATA

#define I2C_FUNC_SMBUS_BLOCK_DATA I2C_FUNC_SMBUS_READ_BLOCK_DATA | \

                                  I2C_FUNC_SMBUS_WRITE_BLOCK_DATA

#define I2C_FUNC_SMBUS_I2C_BLOCK I2C_FUNC_SMBUS_READ_I2C_BLOCK | \

                                  I2C_FUNC_SMBUS_WRITE_I2C_BLOCK

#define I2C_FUNC_SMBUS_EMUL I2C_FUNC_SMBUS_QUICK | \

                            I2C_FUNC_SMBUS_BYTE | \

                            I2C_FUNC_SMBUS_BYTE_DATA | \

                            I2C_FUNC_SMBUS_WORD_DATA | \

                            I2C_FUNC_SMBUS_PROC_CALL | \

                            I2C_FUNC_SMBUS_WRITE_BLOCK_DATA

/*

 * Data for SMBus Messages

 */

union i2c_smbus_data {

        __u8 byte;

        __u16 word;

        __u8 block[33]; /* block[0] is used for length */

};

/* smbus_access read or write markers */

#define I2C_SMBUS_READ  1

#define I2C_SMBUS_WRITE 0

/* SMBus transaction types (size parameter in the above functions)

   Note: these no longer correspond to the (arbitrary) PIIX4 internal codes! */

#define I2C_SMBUS_QUICK             0

#define I2C_SMBUS_BYTE              1

#define I2C_SMBUS_BYTE_DATA         2 

#define I2C_SMBUS_WORD_DATA         3

#define I2C_SMBUS_PROC_CALL         4

#define I2C_SMBUS_BLOCK_DATA        5

#define I2C_SMBUS_I2C_BLOCK_DATA    6

/* ----- commands for the ioctl like i2c_command call:

 * note that additional calls are defined in the algorithm and hw

 *      dependent layers - these can be listed here, or see the

 *      corresponding header files.

 */

                                /* -> bit-adapter specific ioctls       */

#define I2C_RETRIES     0x0701  /* number of times a device address      */

                                /* should be polled when not            */

                                /* acknowledging                        */

#define I2C_TIMEOUT     0x0702  /* set timeout - call with int          */

/* this is for i2c-dev.c        */

#define I2C_SLAVE       0x0703  /* Change slave address                 */

                                /* Attn.: Slave address is 7 or 10 bits */

#define I2C_SLAVE_FORCE 0x0706  /* Change slave address                 */

                                /* Attn.: Slave address is 7 or 10 bits */

                                /* This changes the address, even if it */

                                /* is already taken!                    */

#define I2C_TENBIT      0x0704  /* 0 for 7 bit addrs, != 0 for 10 bit   */

#define I2C_FUNCS       0x0705  /* Get the adapter functionality */

#define I2C_RDWR        0x0707  /* Combined R/W transfer (one stop only)*/

#if 0

#define I2C_ACK_TEST    0x0710  /* See if a slave is at a specific address */

#endif

#define I2C_SMBUS       0x0720  /* SMBus-level access */

/* ... algo-bit.c recognizes */

#define I2C_UDELAY      0x0705  /* set delay in microsecs between each  */

                                /* written byte (except address)        */

#define I2C_MDELAY      0x0706  /* millisec delay between written bytes */

/* ----- I2C-DEV: char device interface stuff ------------------------- */

#define I2C_MAJOR       89              /* Device major number          */

#  ifndef NULL

#    define NULL ( (void *) 0 )

#  endif

#  ifndef ENODEV

#    include <asm/errno.h>

#  endif

/* These defines are used for probing i2c client addresses */

/* Default fill of many variables */

#define I2C_CLIENT_DEFAULTS {I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \

                          I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \

                          I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \

                          I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \

                          I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \

                          I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \

                          I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \

                          I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \

                          I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \

                          I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \

                          I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \

                          I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \

                          I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \

                          I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \

                          I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \

                          I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END}

/* This is ugly. We need to evaluate I2C_CLIENT_MAX_OPTS before it is

   stringified */

#define I2C_CLIENT_MODPARM_AUX1(x) "1-" #x "h"

#define I2C_CLIENT_MODPARM_AUX(x) I2C_CLIENT_MODPARM_AUX1(x)

#define I2C_CLIENT_MODPARM I2C_CLIENT_MODPARM_AUX(I2C_CLIENT_MAX_OPTS)

/* I2C_CLIENT_MODULE_PARM creates a module parameter, and puts it in the

   module header */

#define I2C_CLIENT_MODULE_PARM(var,desc) \

  static unsigned short var[I2C_CLIENT_MAX_OPTS] = I2C_CLIENT_DEFAULTS; \

  MODULE_PARM(var,I2C_CLIENT_MODPARM); \

  MODULE_PARM_DESC(var,desc)

/* This is the one you want to use in your own modules */

#define I2C_CLIENT_INSMOD \

  I2C_CLIENT_MODULE_PARM(probe, \

                      "List of adapter,address pairs to scan additionally"); \

  I2C_CLIENT_MODULE_PARM(probe_range, \

                      "List of adapter,start-addr,end-addr triples to scan " \

                      "additionally"); \

  I2C_CLIENT_MODULE_PARM(ignore, \

                      "List of adapter,address pairs not to scan"); \

  I2C_CLIENT_MODULE_PARM(ignore_range, \

                      "List of adapter,start-addr,end-addr triples not to " \

                      "scan"); \

  I2C_CLIENT_MODULE_PARM(force, \

                      "List of adapter,address pairs to boldly assume " \

                      "to be present"); \

  static struct i2c_client_address_data addr_data = \

                                       {normal_i2c, normal_i2c_range, \

                                        probe, probe_range, \

                                        ignore, ignore_range, \

                                        force}

/* Detect whether we are on the isa bus. If this returns true, all i2c

   access will fail! */

#define i2c_is_isa_client(clientptr) \

        ((clientptr)->adapter->algo->id == I2C_ALGO_ISA)

#define i2c_is_isa_adapter(adapptr) \

        ((adapptr)->algo->id == I2C_ALGO_ISA)

#endif /* I2C_H */