i2c.h
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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 Ky鰏ti M鋖kki <kmalkki@cc.hut.fi> and
- Frodo Looijaard <frodol@dds.nl> */
- /* $Id: i2c.h,v 1.46 2001/08/31 00:04:07 phil Exp $ */
- #ifndef I2C_H
- #define I2C_H
- #define I2C_DATE "20010830"
- #define I2C_VERSION "2.6.1"
- #include <linux/i2c-id.h> /* id values of adapters et. al. */
- #include <linux/types.h>
- struct i2c_msg;
- #ifdef __KERNEL__
- /* --- Includes and compatibility declarations ------------------------ */
- #include <linux/version.h>
- #ifndef KERNEL_VERSION
- #define KERNEL_VERSION(a,b,c) (((a) << 16) | ((b) << 8) | (c))
- #endif
- #include <asm/page.h> /* for 2.2.xx */
- #if LINUX_VERSION_CODE < KERNEL_VERSION(2,0,25)
- #include <linux/sched.h>
- #else
- #include <asm/semaphore.h>
- #endif
- #include <linux/config.h>
- /* --- 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 *);
- };
- #if LINUX_VERSION_CODE < KERNEL_VERSION(2,1,29)
- struct proc_dir_entry;
- #endif
- /*
- * 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 */
- struct semaphore lock;
- unsigned int flags;/* flags specifying div. data */
- struct i2c_client *clients[I2C_CLIENT_MAX];
- int client_count;
- int timeout;
- int retries;
- #ifdef CONFIG_PROC_FS
- /* No need to set this when you initialize the adapter */
- int inode;
- #if LINUX_VERSION_CODE < KERNEL_VERSION(2,1,29)
- struct proc_dir_entry *proc_entry;
- #endif
- #endif /* def CONFIG_PROC_FS */
- };
- /*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);
- #endif /* __KERNEL__ */
- /*
- * 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 */
- #ifdef __KERNEL__
- # 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 /* def __KERNEL__ */
- #endif /* I2C_H */