| /* ------------------------------------------------------------------------- */ |
| /* */ |
| /* 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/module.h> |
| #include <linux/i2c-id.h> |
| #include <linux/mod_devicetable.h> |
| #include <linux/device.h> /* for struct device */ |
| #include <linux/sched.h> /* for completion */ |
| #include <linux/mutex.h> |
| |
| extern struct bus_type i2c_bus_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; |
| |
| #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. |
| */ |
| extern int i2c_master_send(struct i2c_client *client, const char *buf, |
| int count); |
| extern int i2c_master_recv(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(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); |
| /* 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, const u8 *values); |
| /* Returns the number of read bytes */ |
| extern s32 i2c_smbus_read_i2c_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, |
| 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 (for legacy drivers) |
| * @detach_adapter: Callback for bus removal (for legacy drivers) |
| * @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 |
| * @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 if you can, it will probably |
| * be removed in a near future. |
| */ |
| int (*attach_adapter)(struct i2c_adapter *); |
| int (*detach_adapter)(struct i2c_adapter *); |
| |
| /* 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 |
| * @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; |
| 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. |
| */ |
| extern struct i2c_client * |
| i2c_new_probed_device(struct i2c_adapter *adap, |
| struct i2c_board_info *info, |
| unsigned short const *addr_list); |
| |
| /* 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 id; |
| 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; |
| }; |
| #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); |
| } |
| |
| /** |
| * i2c_lock_adapter - Prevent access to an I2C bus segment |
| * @adapter: Target I2C bus segment |
| */ |
| static inline void i2c_lock_adapter(struct i2c_adapter *adapter) |
| { |
| rt_mutex_lock(&adapter->bus_lock); |
| } |
| |
| /** |
| * i2c_unlock_adapter - Reauthorize access to an I2C bus segment |
| * @adapter: Target I2C bus segment |
| */ |
| static inline void i2c_unlock_adapter(struct i2c_adapter *adapter) |
| { |
| rt_mutex_unlock(&adapter->bus_lock); |
| } |
| |
| /*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_TV_ANALOG (1<<1) /* bttv + friends */ |
| #define I2C_CLASS_TV_DIGITAL (1<<2) /* dvb cards */ |
| #define I2C_CLASS_DDC (1<<3) /* DDC bus on graphics adapters */ |
| #define I2C_CLASS_SPD (1<<7) /* SPD EEPROMs and similar */ |
| |
| /* Internal numbers to terminate lists */ |
| #define I2C_CLIENT_END 0xfffeU |
| |
| /* The numbers to use to set I2C bus address */ |
| #define ANY_I2C_BUS 0xffff |
| |
| /* 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 *); |
| |
| static inline int i2c_add_driver(struct i2c_driver *driver) |
| { |
| return 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 id); |
| 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; |
| } |
| #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 */ |