init android origin source code

1 files changed, 619 insertions, 0 deletions

diff --git a/ANDROID_3.4.5/include/linux/i2c.h b/ANDROID_3.4.5/include/linux/i2c.h
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+++ b/ANDROID_3.4.5/include/linux/i2c.h
@@ -0,0 +1,619 @@
+/* ------------------------------------------------------------------------- */
+/*									     */
+/* 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., 51 Franklin Street, Fifth Floor, Boston,
+    MA 02110-1301 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 */