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

  /*									     */

  /* 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> */

  #ifndef _LINUX_I2C_H
  #define _LINUX_I2C_H

  #include <linux/types.h>

  #ifdef __KERNEL__

  #include <linux/mod_devicetable.h>

  #include <linux/device.h>	/* for struct device */

  #include <linux/sched.h>	/* for completion */

  #include <linux/mutex.h>

  #include <linux/of.h>		/* for struct device_node */

  #include <linux/swab.h>		/* for swab16 */

  extern struct bus_type i2c_bus_type;

  extern struct device_type i2c_adapter_type;

  /* --- General options ------------------------------------------------	*/
  
  struct i2c_msg;
  struct i2c_algorithm;
  struct i2c_adapter;
  struct i2c_client;
  struct i2c_driver;

  union i2c_smbus_data;

  struct i2c_board_info;

  struct module;

  #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)

  /*
   * 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.

   * @count must be be less than 64k since msg.len is u16.

   */

  extern int i2c_master_send(const struct i2c_client *client, const char *buf,
  			   int count);
  extern int i2c_master_recv(const struct i2c_client *client, char *buf,

  			   int count);

  
  /* Transfer num messages.
   */

  extern int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
  			int num);

  
  /* 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 i2c_smbus_xfer. */

  extern s32 i2c_smbus_read_byte(const struct i2c_client *client);
  extern s32 i2c_smbus_write_byte(const struct i2c_client *client, u8 value);
  extern s32 i2c_smbus_read_byte_data(const struct i2c_client *client,
  				    u8 command);
  extern s32 i2c_smbus_write_byte_data(const struct i2c_client *client,

  				     u8 command, u8 value);

  extern s32 i2c_smbus_read_word_data(const struct i2c_client *client,
  				    u8 command);
  extern s32 i2c_smbus_write_word_data(const struct i2c_client *client,

  				     u8 command, u16 value);

  
  static inline s32
  i2c_smbus_read_word_swapped(const struct i2c_client *client, u8 command)
  {
  	s32 value = i2c_smbus_read_word_data(client, command);
  
  	return (value < 0) ? value : swab16(value);
  }
  
  static inline s32
  i2c_smbus_write_word_swapped(const struct i2c_client *client,
  			     u8 command, u16 value)
  {
  	return i2c_smbus_write_word_data(client, command, swab16(value));
  }

  /* Returns the number of read bytes */

  extern s32 i2c_smbus_read_block_data(const struct i2c_client *client,

  				     u8 command, u8 *values);

  extern s32 i2c_smbus_write_block_data(const struct i2c_client *client,

  				      u8 command, u8 length, const u8 *values);

  /* Returns the number of read bytes */

  extern s32 i2c_smbus_read_i2c_block_data(const struct i2c_client *client,

  					 u8 command, u8 length, u8 *values);

  extern s32 i2c_smbus_write_i2c_block_data(const struct i2c_client *client,

  					  u8 command, u8 length,

  					  const u8 *values);

  #endif /* I2C */

  /**
   * struct i2c_driver - represent an I2C device driver
   * @class: What kind of i2c device we instantiate (for detect)

   * @attach_adapter: Callback for bus addition (deprecated)
   * @detach_adapter: Callback for bus removal (deprecated)

   * @probe: Callback for device binding
   * @remove: Callback for device unbinding

   * @shutdown: Callback for device shutdown
   * @suspend: Callback for device suspend
   * @resume: Callback for device resume

   * @alert: Alert callback, for example for the SMBus alert protocol

   * @command: Callback for bus-wide signaling (optional)
   * @driver: Device driver model driver
   * @id_table: List of I2C devices supported by this driver

   * @detect: Callback for device detection

   * @address_list: The I2C addresses to probe (for detect)

   * @clients: List of detected clients we created (for i2c-core use only)

   *
   * The driver.owner field should be set to the module owner of this driver.
   * The driver.name field should be set to the name of this driver.

   *
   * For automatic device detection, both @detect and @address_data must
   * be defined. @class should also be set, otherwise only devices forced
   * with module parameters will be created. The detect function must
   * fill at least the name field of the i2c_board_info structure it is
   * handed upon successful detection, and possibly also the flags field.
   *
   * If @detect is missing, the driver will still work fine for enumerated
   * devices. Detected devices simply won't be supported. This is expected
   * for the many I2C/SMBus devices which can't be detected reliably, and
   * the ones which can always be enumerated in practice.
   *
   * The i2c_client structure which is handed to the @detect callback is
   * not a real i2c_client. It is initialized just enough so that you can
   * call i2c_smbus_read_byte_data and friends on it. Don't do anything
   * else with it. In particular, calling dev_dbg and friends on it is
   * not allowed.

   */

  struct i2c_driver {

  	unsigned int class;

  	/* Notifies the driver that a new bus has appeared or is about to be

  	 * removed. You should avoid using this, it will be removed in a
  	 * near future.

  	 */

  	int (*attach_adapter)(struct i2c_adapter *) __deprecated;
  	int (*detach_adapter)(struct i2c_adapter *) __deprecated;

  	/* Standard driver model interfaces */

  	int (*probe)(struct i2c_client *, const struct i2c_device_id *);

  	int (*remove)(struct i2c_client *);

  	/* driver model interfaces that don't relate to enumeration  */
  	void (*shutdown)(struct i2c_client *);
  	int (*suspend)(struct i2c_client *, pm_message_t mesg);
  	int (*resume)(struct i2c_client *);

  	/* Alert callback, for example for the SMBus alert protocol.
  	 * The format and meaning of the data value depends on the protocol.
  	 * For the SMBus alert protocol, there is a single bit of data passed
  	 * as the alert response's low bit ("event flag").
  	 */
  	void (*alert)(struct i2c_client *, unsigned int data);

  	/* 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);

  
  	struct device_driver driver;

  	const struct i2c_device_id *id_table;

  
  	/* Device detection callback for automatic device creation */

  	int (*detect)(struct i2c_client *, struct i2c_board_info *);

  	const unsigned short *address_list;

  	struct list_head clients;

  };
  #define to_i2c_driver(d) container_of(d, struct i2c_driver, driver)

  /**
   * struct i2c_client - represent an I2C slave device

   * @flags: I2C_CLIENT_TEN indicates the device uses a ten bit chip address;
   *	I2C_CLIENT_PEC indicates it uses SMBus Packet Error Checking

   * @addr: Address used on the I2C bus connected to the parent adapter.
   * @name: Indicates the type of the device, usually a chip name that's
   *	generic enough to hide second-sourcing and compatible revisions.

   * @adapter: manages the bus segment hosting this I2C device

   * @driver: device's driver, hence pointer to access routines

   * @dev: Driver model device node for the slave.

   * @irq: indicates the IRQ generated by this device (if any)

   * @detected: member of an i2c_driver.clients list or i2c-core's
   *	userspace_devices list

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

   * i2c bus. The behaviour exposed to Linux is defined by the driver
   * managing the device.

   */
  struct i2c_client {

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

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

  					/* addresses are stored in the	*/

  					/* _LOWER_ 7 bits		*/

  	char name[I2C_NAME_SIZE];

  	struct i2c_adapter *adapter;	/* the adapter we sit on	*/
  	struct i2c_driver *driver;	/* and our access routines	*/

  	struct device dev;		/* the device structure		*/

  	int irq;			/* irq issued by device		*/

  	struct list_head detected;

  };
  #define to_i2c_client(d) container_of(d, struct i2c_client, dev)

  extern struct i2c_client *i2c_verify_client(struct device *dev);

  static inline struct i2c_client *kobj_to_i2c_client(struct kobject *kobj)
  {

  	struct device * const dev = container_of(kobj, struct device, kobj);
  	return to_i2c_client(dev);

  }

  static inline void *i2c_get_clientdata(const struct i2c_client *dev)

  {

  	return dev_get_drvdata(&dev->dev);

  }

  static inline void i2c_set_clientdata(struct i2c_client *dev, void *data)

  {

  	dev_set_drvdata(&dev->dev, data);

  }

  /**
   * struct i2c_board_info - template for device creation

   * @type: chip type, to initialize i2c_client.name

   * @flags: to initialize i2c_client.flags
   * @addr: stored in i2c_client.addr
   * @platform_data: stored in i2c_client.dev.platform_data

   * @archdata: copied into i2c_client.dev.archdata

   * @of_node: pointer to OpenFirmware device node

   * @irq: stored in i2c_client.irq

   *

   * I2C doesn't actually support hardware probing, although controllers and
   * devices may be able to use I2C_SMBUS_QUICK to tell whether or not there's
   * a device at a given address.  Drivers commonly need more information than
   * that, such as chip type, configuration, associated IRQ, and so on.
   *
   * i2c_board_info is used to build tables of information listing I2C devices

   * that are present.  This information is used to grow the driver model tree.
   * For mainboards this is done statically using i2c_register_board_info();
   * bus numbers identify adapters that aren't yet available.  For add-on boards,
   * i2c_new_device() does this dynamically with the adapter already known.

   */
  struct i2c_board_info {

  	char		type[I2C_NAME_SIZE];
  	unsigned short	flags;
  	unsigned short	addr;
  	void		*platform_data;

  	struct dev_archdata	*archdata;

  	struct device_node *of_node;

  	int		irq;
  };
  
  /**

   * I2C_BOARD_INFO - macro used to list an i2c device and its address
   * @dev_type: identifies the device type

   * @dev_addr: the device's address on the bus.
   *
   * This macro initializes essential fields of a struct i2c_board_info,
   * declaring what has been provided on a particular board.  Optional

   * fields (such as associated irq, or device-specific platform_data)
   * are provided using conventional syntax.

   */

  #define I2C_BOARD_INFO(dev_type, dev_addr) \

  	.type = dev_type, .addr = (dev_addr)

  #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)

  /* Add-on boards should register/unregister their devices; e.g. a board
   * with integrated I2C, a config eeprom, sensors, and a codec that's
   * used in conjunction with the primary hardware.
   */
  extern struct i2c_client *
  i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info);

  /* If you don't know the exact address of an I2C device, use this variant
   * instead, which can probe for device presence in a list of possible

   * addresses. The "probe" callback function is optional. If it is provided,
   * it must return 1 on successful probe, 0 otherwise. If it is not provided,
   * a default probing method is used.

   */
  extern struct i2c_client *
  i2c_new_probed_device(struct i2c_adapter *adap,
  		      struct i2c_board_info *info,

  		      unsigned short const *addr_list,
  		      int (*probe)(struct i2c_adapter *, unsigned short addr));

  /* Common custom probe functions */
  extern int i2c_probe_func_quick_read(struct i2c_adapter *, unsigned short addr);

  /* For devices that use several addresses, use i2c_new_dummy() to make
   * client handles for the extra addresses.
   */
  extern struct i2c_client *

  i2c_new_dummy(struct i2c_adapter *adap, u16 address);

  extern void i2c_unregister_device(struct i2c_client *);

  #endif /* I2C */

  
  /* Mainboard arch_initcall() code should register all its I2C devices.
   * This is done at arch_initcall time, before declaring any i2c adapters.
   * Modules for add-on boards must use other calls.
   */

  #ifdef CONFIG_I2C_BOARDINFO

  extern int

  i2c_register_board_info(int busnum, struct i2c_board_info const *info,
  			unsigned n);

  #else
  static inline int

  i2c_register_board_info(int busnum, struct i2c_board_info const *info,
  			unsigned n)

  {
  	return 0;
  }

  #endif /* I2C_BOARDINFO */

  /*
   * 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 {

  	/* If an adapter algorithm can't do 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 */

  	/* master_xfer should return the number of messages successfully
  	   processed, or a negative value on error */

  	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);

  	/* 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 {
  	struct module *owner;

  	unsigned int class;		  /* classes to allow probing for */

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

  	void *algo_data;

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

  	struct rt_mutex bus_lock;

  	int timeout;			/* in jiffies */

  	int retries;
  	struct device dev;		/* the adapter device */

  	int nr;

  	char name[48];

  	struct completion dev_released;

  	struct mutex userspace_clients_lock;

  	struct list_head userspace_clients;

  };

  #define to_i2c_adapter(d) container_of(d, struct i2c_adapter, dev)

  static inline void *i2c_get_adapdata(const struct i2c_adapter *dev)

  {

  	return dev_get_drvdata(&dev->dev);

  }

  static inline void i2c_set_adapdata(struct i2c_adapter *dev, void *data)

  {

  	dev_set_drvdata(&dev->dev, data);

  }

  static inline struct i2c_adapter *
  i2c_parent_is_i2c_adapter(const struct i2c_adapter *adapter)

  {

  	struct device *parent = adapter->dev.parent;
  
  	if (parent != NULL && parent->type == &i2c_adapter_type)
  		return to_i2c_adapter(parent);
  	else
  		return NULL;

  }

  int i2c_for_each_dev(void *data, int (*fn)(struct device *, void *));

  /* Adapter locking functions, exported for shared pin cases */
  void i2c_lock_adapter(struct i2c_adapter *);
  void i2c_unlock_adapter(struct i2c_adapter *);

  /*flags for the client struct: */

  #define I2C_CLIENT_PEC	0x04		/* Use Packet Error Checking */
  #define I2C_CLIENT_TEN	0x10		/* we have a ten bit chip address */
  					/* Must equal I2C_M_TEN below */
  #define I2C_CLIENT_WAKE	0x80		/* for board_info; true iff can wake */

  
  /* i2c adapter classes (bitmask) */
  #define I2C_CLASS_HWMON		(1<<0)	/* lm_sensors, ... */

  #define I2C_CLASS_DDC		(1<<3)	/* DDC bus on graphics adapters */

  #define I2C_CLASS_SPD		(1<<7)	/* Memory modules */

  /* Internal numbers to terminate lists */
  #define I2C_CLIENT_END		0xfffeU

  /* Construct an I2C_CLIENT_END-terminated array of i2c addresses */
  #define I2C_ADDRS(addr, addrs...) \
  	((const unsigned short []){ addr, ## addrs, I2C_CLIENT_END })

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

  #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)

  extern int i2c_add_adapter(struct i2c_adapter *);
  extern int i2c_del_adapter(struct i2c_adapter *);

  extern int i2c_add_numbered_adapter(struct i2c_adapter *);

  extern int i2c_register_driver(struct module *, struct i2c_driver *);

  extern void i2c_del_driver(struct i2c_driver *);

  /* use a define to avoid include chaining to get THIS_MODULE */
  #define i2c_add_driver(driver) \
  	i2c_register_driver(THIS_MODULE, driver)

  extern struct i2c_client *i2c_use_client(struct i2c_client *client);
  extern void i2c_release_client(struct i2c_client *client);

  
  /* call the i2c_client->command() of all attached clients with
   * the given arguments */
  extern void i2c_clients_command(struct i2c_adapter *adap,
  				unsigned int cmd, void *arg);

  extern struct i2c_adapter *i2c_get_adapter(int nr);

  extern void i2c_put_adapter(struct i2c_adapter *adap);
  
  
  /* Return the functionality mask */
  static inline u32 i2c_get_functionality(struct i2c_adapter *adap)
  {
  	return adap->algo->functionality(adap);
  }
  
  /* Return 1 if adapter supports everything we need, 0 if not. */
  static inline int i2c_check_functionality(struct i2c_adapter *adap, u32 func)
  {
  	return (func & i2c_get_functionality(adap)) == func;
  }

  /* Return the adapter number for a specific adapter */

  static inline int i2c_adapter_id(struct i2c_adapter *adap)
  {
  	return adap->nr;
  }

  
  /**
   * module_i2c_driver() - Helper macro for registering a I2C driver
   * @__i2c_driver: i2c_driver struct
   *
   * Helper macro for I2C drivers which do not do anything special in module
   * init/exit. This eliminates a lot of boilerplate. Each module may only
   * use this macro once, and calling it replaces module_init() and module_exit()
   */
  #define module_i2c_driver(__i2c_driver) \
  	module_driver(__i2c_driver, i2c_add_driver, \
  			i2c_del_driver)

  #endif /* I2C */

  #endif /* __KERNEL__ */

  /**
   * struct i2c_msg - an I2C transaction segment beginning with START
   * @addr: Slave address, either seven or ten bits.  When this is a ten
   *	bit address, I2C_M_TEN must be set in @flags and the adapter
   *	must support I2C_FUNC_10BIT_ADDR.
   * @flags: I2C_M_RD is handled by all adapters.  No other flags may be
   *	provided unless the adapter exported the relevant I2C_FUNC_*
   *	flags through i2c_check_functionality().
   * @len: Number of data bytes in @buf being read from or written to the
   *	I2C slave address.  For read transactions where I2C_M_RECV_LEN
   *	is set, the caller guarantees that this buffer can hold up to
   *	32 bytes in addition to the initial length byte sent by the
   *	slave (plus, if used, the SMBus PEC); and this value will be
   *	incremented by the number of block data bytes received.
   * @buf: The buffer into which data is read, or from which it's written.
   *
   * An i2c_msg is the low level representation of one segment of an I2C
   * transaction.  It is visible to drivers in the @i2c_transfer() procedure,
   * to userspace from i2c-dev, and to I2C adapter drivers through the
   * @i2c_adapter.@master_xfer() method.
   *
   * Except when I2C "protocol mangling" is used, all I2C adapters implement
   * the standard rules for I2C transactions.  Each transaction begins with a
   * START.  That is followed by the slave address, and a bit encoding read
   * versus write.  Then follow all the data bytes, possibly including a byte
   * with SMBus PEC.  The transfer terminates with a NAK, or when all those
   * bytes have been transferred and ACKed.  If this is the last message in a
   * group, it is followed by a STOP.  Otherwise it is followed by the next
   * @i2c_msg transaction segment, beginning with a (repeated) START.
   *
   * Alternatively, when the adapter supports I2C_FUNC_PROTOCOL_MANGLING then
   * passing certain @flags may have changed those standard protocol behaviors.
   * Those flags are only for use with broken/nonconforming slaves, and with
   * adapters which are known to support the specific mangling options they
   * need (one or more of IGNORE_NAK, NO_RD_ACK, NOSTART, and REV_DIR_ADDR).

   */
  struct i2c_msg {
  	__u16 addr;	/* slave address			*/

  	__u16 flags;

  #define I2C_M_TEN		0x0010	/* this is a ten bit chip address */
  #define I2C_M_RD		0x0001	/* read data, from slave to master */
  #define I2C_M_NOSTART		0x4000	/* if I2C_FUNC_PROTOCOL_MANGLING */
  #define I2C_M_REV_DIR_ADDR	0x2000	/* if I2C_FUNC_PROTOCOL_MANGLING */
  #define I2C_M_IGNORE_NAK	0x1000	/* if I2C_FUNC_PROTOCOL_MANGLING */
  #define I2C_M_NO_RD_ACK		0x0800	/* if I2C_FUNC_PROTOCOL_MANGLING */
  #define I2C_M_RECV_LEN		0x0400	/* length will be first received byte */

  	__u16 len;		/* msg length				*/
  	__u8 *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_NOSTART etc. */

  #define I2C_FUNC_SMBUS_PEC		0x00000008

  #define I2C_FUNC_SMBUS_BLOCK_PROC_CALL	0x00008000 /* SMBus 2.0 */

  #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 /* I2C-like block xfer  */
  #define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK	0x08000000 /* w/ 1-byte reg. addr. */

  #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 | \
  					 I2C_FUNC_SMBUS_I2C_BLOCK | \
  					 I2C_FUNC_SMBUS_PEC)

  /*
   * Data for SMBus Messages

   */

  #define I2C_SMBUS_BLOCK_MAX	32	/* As specified in SMBus standard */

  union i2c_smbus_data {
  	__u8 byte;
  	__u16 word;

  	__u8 block[I2C_SMBUS_BLOCK_MAX + 2]; /* block[0] is used for length */

  			       /* and one more for user-space compatibility */

  };

  /* i2c_smbus_xfer 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_BROKEN  6

  #define I2C_SMBUS_BLOCK_PROC_CALL   7		/* SMBus 2.0 */

  #define I2C_SMBUS_I2C_BLOCK_DATA    8

  #endif /* _LINUX_I2C_H */