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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., 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 */
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