include/linux/i2c.h

   1 /* ------------------------------------------------------------------------- */
   2 /*                                                                           */
   3 /* i2c.h - definitions for the i2c-bus interface                             */
   4 /*                                                                           */
   5 /* ------------------------------------------------------------------------- */
   6 /*   Copyright (C) 1995-2000 Simon G. Vogl
   7
   8     This program is free software; you can redistribute it and/or modify
   9     it under the terms of the GNU General Public License as published by
  10     the Free Software Foundation; either version 2 of the License, or
  11     (at your option) any later version.
  12
  13     This program is distributed in the hope that it will be useful,
  14     but WITHOUT ANY WARRANTY; without even the implied warranty of
  15     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16     GNU General Public License for more details.
  17
  18     You should have received a copy of the GNU General Public License
  19     along with this program; if not, write to the Free Software
  20     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.                */
  21 /* ------------------------------------------------------------------------- */
  22
  23 /* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and
  24    Frodo Looijaard <frodol@dds.nl> */
  25
  26 #ifndef _LINUX_I2C_H
  27 #define _LINUX_I2C_H
  28
  29 #include <linux/types.h>
  30 #ifdef __KERNEL__
  31 #include <linux/module.h>
  32 #include <linux/i2c-id.h>
  33 #include <linux/mod_devicetable.h>
  34 #include <linux/device.h>       /* for struct device */
  35 #include <linux/sched.h>        /* for completion */
  36 #include <linux/mutex.h>
  37
  38 extern struct bus_type i2c_bus_type;
  39
  40 /* --- General options ------------------------------------------------ */
  41
  42 struct i2c_msg;
  43 struct i2c_algorithm;
  44 struct i2c_adapter;
  45 struct i2c_client;
  46 struct i2c_driver;
  47 union i2c_smbus_data;
  48 struct i2c_board_info;
  49
  50 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
  51 /*
  52  * The master routines are the ones normally used to transmit data to devices
  53  * on a bus (or read from them). Apart from two basic transfer functions to
  54  * transmit one message at a time, a more complex version can be used to
  55  * transmit an arbitrary number of messages without interruption.
  56  * @count must be be less than 64k since msg.len is u16.
  57  */
  58 extern int i2c_master_send(struct i2c_client *client, const char *buf,
  59                            int count);
  60 extern int i2c_master_recv(struct i2c_client *client, char *buf, int count);
  61
  62 /* Transfer num messages.
  63  */
  64 extern int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
  65                         int num);
  66
  67 /* This is the very generalized SMBus access routine. You probably do not
  68    want to use this, though; one of the functions below may be much easier,
  69    and probably just as fast.
  70    Note that we use i2c_adapter here, because you do not need a specific
  71    smbus adapter to call this function. */
  72 extern s32 i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr,
  73                           unsigned short flags, char read_write, u8 command,
  74                           int size, union i2c_smbus_data *data);
  75
  76 /* Now follow the 'nice' access routines. These also document the calling
  77    conventions of i2c_smbus_xfer. */
  78
  79 extern s32 i2c_smbus_read_byte(struct i2c_client *client);
  80 extern s32 i2c_smbus_write_byte(struct i2c_client *client, u8 value);
  81 extern s32 i2c_smbus_read_byte_data(struct i2c_client *client, u8 command);
  82 extern s32 i2c_smbus_write_byte_data(struct i2c_client *client,
  83                                      u8 command, u8 value);
  84 extern s32 i2c_smbus_read_word_data(struct i2c_client *client, u8 command);
  85 extern s32 i2c_smbus_write_word_data(struct i2c_client *client,
  86                                      u8 command, u16 value);
  87 /* Returns the number of read bytes */
  88 extern s32 i2c_smbus_read_block_data(struct i2c_client *client,
  89                                      u8 command, u8 *values);
  90 extern s32 i2c_smbus_write_block_data(struct i2c_client *client,
  91                                       u8 command, u8 length, const u8 *values);
  92 /* Returns the number of read bytes */
  93 extern s32 i2c_smbus_read_i2c_block_data(struct i2c_client *client,
  94                                          u8 command, u8 length, u8 *values);
  95 extern s32 i2c_smbus_write_i2c_block_data(struct i2c_client *client,
  96                                           u8 command, u8 length,
  97                                           const u8 *values);
  98 #endif /* I2C */
  99
 100 /**
 101  * struct i2c_driver - represent an I2C device driver
 102  * @class: What kind of i2c device we instantiate (for detect)
 103  * @attach_adapter: Callback for bus addition (for legacy drivers)
 104  * @detach_adapter: Callback for bus removal (for legacy drivers)
 105  * @probe: Callback for device binding
 106  * @remove: Callback for device unbinding
 107  * @shutdown: Callback for device shutdown
 108  * @suspend: Callback for device suspend
 109  * @resume: Callback for device resume
 110  * @command: Callback for bus-wide signaling (optional)
 111  * @driver: Device driver model driver
 112  * @id_table: List of I2C devices supported by this driver
 113  * @detect: Callback for device detection
 114  * @address_list: The I2C addresses to probe (for detect)
 115  * @clients: List of detected clients we created (for i2c-core use only)
 116  *
 117  * The driver.owner field should be set to the module owner of this driver.
 118  * The driver.name field should be set to the name of this driver.
 119  *
 120  * For automatic device detection, both @detect and @address_data must
 121  * be defined. @class should also be set, otherwise only devices forced
 122  * with module parameters will be created. The detect function must
 123  * fill at least the name field of the i2c_board_info structure it is
 124  * handed upon successful detection, and possibly also the flags field.
 125  *
 126  * If @detect is missing, the driver will still work fine for enumerated
 127  * devices. Detected devices simply won't be supported. This is expected
 128  * for the many I2C/SMBus devices which can't be detected reliably, and
 129  * the ones which can always be enumerated in practice.
 130  *
 131  * The i2c_client structure which is handed to the @detect callback is
 132  * not a real i2c_client. It is initialized just enough so that you can
 133  * call i2c_smbus_read_byte_data and friends on it. Don't do anything
 134  * else with it. In particular, calling dev_dbg and friends on it is
 135  * not allowed.
 136  */
 137 struct i2c_driver {
 138         unsigned int class;
 139
 140         /* Notifies the driver that a new bus has appeared or is about to be
 141          * removed. You should avoid using this if you can, it will probably
 142          * be removed in a near future.
 143          */
 144         int (*attach_adapter)(struct i2c_adapter *);
 145         int (*detach_adapter)(struct i2c_adapter *);
 146
 147         /* Standard driver model interfaces */
 148         int (*probe)(struct i2c_client *, const struct i2c_device_id *);
 149         int (*remove)(struct i2c_client *);
 150
 151         /* driver model interfaces that don't relate to enumeration  */
 152         void (*shutdown)(struct i2c_client *);
 153         int (*suspend)(struct i2c_client *, pm_message_t mesg);
 154         int (*resume)(struct i2c_client *);
 155
 156         /* Alert callback, for example for the SMBus alert protocol.
 157          * The format and meaning of the data value depends on the protocol.
 158          * For the SMBus alert protocol, there is a single bit of data passed
 159          * as the alert response's low bit ("event flag").
 160          */
 161         void (*alert)(struct i2c_client *, unsigned int data);
 162
 163         /* a ioctl like command that can be used to perform specific functions
 164          * with the device.
 165          */
 166         int (*command)(struct i2c_client *client, unsigned int cmd, void *arg);
 167
 168         struct device_driver driver;
 169         const struct i2c_device_id *id_table;
 170
 171         /* Device detection callback for automatic device creation */
 172         int (*detect)(struct i2c_client *, struct i2c_board_info *);
 173         const unsigned short *address_list;
 174         struct list_head clients;
 175 };
 176 #define to_i2c_driver(d) container_of(d, struct i2c_driver, driver)
 177
 178 /**
 179  * struct i2c_client - represent an I2C slave device
 180  * @flags: I2C_CLIENT_TEN indicates the device uses a ten bit chip address;
 181  *      I2C_CLIENT_PEC indicates it uses SMBus Packet Error Checking
 182  * @addr: Address used on the I2C bus connected to the parent adapter.
 183  * @name: Indicates the type of the device, usually a chip name that's
 184  *      generic enough to hide second-sourcing and compatible revisions.
 185  * @adapter: manages the bus segment hosting this I2C device
 186  * @driver: device's driver, hence pointer to access routines
 187  * @dev: Driver model device node for the slave.
 188  * @irq: indicates the IRQ generated by this device (if any)
 189  * @detected: member of an i2c_driver.clients list or i2c-core's
 190  *      userspace_devices list
 191  *
 192  * An i2c_client identifies a single device (i.e. chip) connected to an
 193  * i2c bus. The behaviour exposed to Linux is defined by the driver
 194  * managing the device.
 195  */
 196 struct i2c_client {
 197         unsigned short flags;           /* div., see below              */
 198         unsigned short addr;            /* chip address - NOTE: 7bit    */
 199                                         /* addresses are stored in the  */
 200                                         /* _LOWER_ 7 bits               */
 201         char name[I2C_NAME_SIZE];
 202         struct i2c_adapter *adapter;    /* the adapter we sit on        */
 203         struct i2c_driver *driver;      /* and our access routines      */
 204         struct device dev;              /* the device structure         */
 205         int irq;                        /* irq issued by device         */
 206         struct list_head detected;
 207 };
 208 #define to_i2c_client(d) container_of(d, struct i2c_client, dev)
 209
 210 extern struct i2c_client *i2c_verify_client(struct device *dev);
 211
 212 static inline struct i2c_client *kobj_to_i2c_client(struct kobject *kobj)
 213 {
 214         struct device * const dev = container_of(kobj, struct device, kobj);
 215         return to_i2c_client(dev);
 216 }
 217
 218 static inline void *i2c_get_clientdata(const struct i2c_client *dev)
 219 {
 220         return dev_get_drvdata(&dev->dev);
 221 }
 222
 223 static inline void i2c_set_clientdata(struct i2c_client *dev, void *data)
 224 {
 225         dev_set_drvdata(&dev->dev, data);
 226 }
 227
 228 /**
 229  * struct i2c_board_info - template for device creation
 230  * @type: chip type, to initialize i2c_client.name
 231  * @flags: to initialize i2c_client.flags
 232  * @addr: stored in i2c_client.addr
 233  * @platform_data: stored in i2c_client.dev.platform_data
 234  * @archdata: copied into i2c_client.dev.archdata
 235  * @irq: stored in i2c_client.irq
 236  *
 237  * I2C doesn't actually support hardware probing, although controllers and
 238  * devices may be able to use I2C_SMBUS_QUICK to tell whether or not there's
 239  * a device at a given address.  Drivers commonly need more information than
 240  * that, such as chip type, configuration, associated IRQ, and so on.
 241  *
 242  * i2c_board_info is used to build tables of information listing I2C devices
 243  * that are present.  This information is used to grow the driver model tree.
 244  * For mainboards this is done statically using i2c_register_board_info();
 245  * bus numbers identify adapters that aren't yet available.  For add-on boards,
 246  * i2c_new_device() does this dynamically with the adapter already known.
 247  */
 248 struct i2c_board_info {
 249         char            type[I2C_NAME_SIZE];
 250         unsigned short  flags;
 251         unsigned short  addr;
 252         void            *platform_data;
 253         struct dev_archdata     *archdata;
 254         int             irq;
 255 };
 256
 257 /**
 258  * I2C_BOARD_INFO - macro used to list an i2c device and its address
 259  * @dev_type: identifies the device type
 260  * @dev_addr: the device's address on the bus.
 261  *
 262  * This macro initializes essential fields of a struct i2c_board_info,
 263  * declaring what has been provided on a particular board.  Optional
 264  * fields (such as associated irq, or device-specific platform_data)
 265  * are provided using conventional syntax.
 266  */
 267 #define I2C_BOARD_INFO(dev_type, dev_addr) \
 268         .type = dev_type, .addr = (dev_addr)
 269
 270
 271 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 272 /* Add-on boards should register/unregister their devices; e.g. a board
 273  * with integrated I2C, a config eeprom, sensors, and a codec that's
 274  * used in conjunction with the primary hardware.
 275  */
 276 extern struct i2c_client *
 277 i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info);
 278
 279 /* If you don't know the exact address of an I2C device, use this variant
 280  * instead, which can probe for device presence in a list of possible
 281  * addresses.
 282  */
 283 extern struct i2c_client *
 284 i2c_new_probed_device(struct i2c_adapter *adap,
 285                       struct i2c_board_info *info,
 286                       unsigned short const *addr_list);
 287
 288 /* For devices that use several addresses, use i2c_new_dummy() to make
 289  * client handles for the extra addresses.
 290  */
 291 extern struct i2c_client *
 292 i2c_new_dummy(struct i2c_adapter *adap, u16 address);
 293
 294 extern void i2c_unregister_device(struct i2c_client *);
 295 #endif /* I2C */
 296
 297 /* Mainboard arch_initcall() code should register all its I2C devices.
 298  * This is done at arch_initcall time, before declaring any i2c adapters.
 299  * Modules for add-on boards must use other calls.
 300  */
 301 #ifdef CONFIG_I2C_BOARDINFO
 302 extern int
 303 i2c_register_board_info(int busnum, struct i2c_board_info const *info,
 304                         unsigned n);
 305 #else
 306 static inline int
 307 i2c_register_board_info(int busnum, struct i2c_board_info const *info,
 308                         unsigned n)
 309 {
 310         return 0;
 311 }
 312 #endif /* I2C_BOARDINFO */
 313
 314 /*
 315  * The following structs are for those who like to implement new bus drivers:
 316  * i2c_algorithm is the interface to a class of hardware solutions which can
 317  * be addressed using the same bus algorithms - i.e. bit-banging or the PCF8584
 318  * to name two of the most common.
 319  */
 320 struct i2c_algorithm {
 321         /* If an adapter algorithm can't do I2C-level access, set master_xfer
 322            to NULL. If an adapter algorithm can do SMBus access, set
 323            smbus_xfer. If set to NULL, the SMBus protocol is simulated
 324            using common I2C messages */
 325         /* master_xfer should return the number of messages successfully
 326            processed, or a negative value on error */
 327         int (*master_xfer)(struct i2c_adapter *adap, struct i2c_msg *msgs,
 328                            int num);
 329         int (*smbus_xfer) (struct i2c_adapter *adap, u16 addr,
 330                            unsigned short flags, char read_write,
 331                            u8 command, int size, union i2c_smbus_data *data);
 332
 333         /* To determine what the adapter supports */
 334         u32 (*functionality) (struct i2c_adapter *);
 335 };
 336
 337 /*
 338  * i2c_adapter is the structure used to identify a physical i2c bus along
 339  * with the access algorithms necessary to access it.
 340  */
 341 struct i2c_adapter {
 342         struct module *owner;
 343         unsigned int id;
 344         unsigned int class;               /* classes to allow probing for */
 345         const struct i2c_algorithm *algo; /* the algorithm to access the bus */
 346         void *algo_data;
 347
 348         /* data fields that are valid for all devices   */
 349         struct rt_mutex bus_lock;
 350
 351         int timeout;                    /* in jiffies */
 352         int retries;
 353         struct device dev;              /* the adapter device */
 354
 355         int nr;
 356         char name[48];
 357         struct completion dev_released;
 358 };
 359 #define to_i2c_adapter(d) container_of(d, struct i2c_adapter, dev)
 360
 361 static inline void *i2c_get_adapdata(const struct i2c_adapter *dev)
 362 {
 363         return dev_get_drvdata(&dev->dev);
 364 }
 365
 366 static inline void i2c_set_adapdata(struct i2c_adapter *dev, void *data)
 367 {
 368         dev_set_drvdata(&dev->dev, data);
 369 }
 370
 371 /**
 372  * i2c_lock_adapter - Prevent access to an I2C bus segment
 373  * @adapter: Target I2C bus segment
 374  */
 375 static inline void i2c_lock_adapter(struct i2c_adapter *adapter)
 376 {
 377         rt_mutex_lock(&adapter->bus_lock);
 378 }
 379
 380 /**
 381  * i2c_unlock_adapter - Reauthorize access to an I2C bus segment
 382  * @adapter: Target I2C bus segment
 383  */
 384 static inline void i2c_unlock_adapter(struct i2c_adapter *adapter)
 385 {
 386         rt_mutex_unlock(&adapter->bus_lock);
 387 }
 388
 389 /*flags for the client struct: */
 390 #define I2C_CLIENT_PEC  0x04            /* Use Packet Error Checking */
 391 #define I2C_CLIENT_TEN  0x10            /* we have a ten bit chip address */
 392                                         /* Must equal I2C_M_TEN below */
 393 #define I2C_CLIENT_WAKE 0x80            /* for board_info; true iff can wake */
 394
 395 /* i2c adapter classes (bitmask) */
 396 #define I2C_CLASS_HWMON         (1<<0)  /* lm_sensors, ... */
 397 #define I2C_CLASS_TV_ANALOG     (1<<1)  /* bttv + friends */
 398 #define I2C_CLASS_TV_DIGITAL    (1<<2)  /* dvb cards */
 399 #define I2C_CLASS_DDC           (1<<3)  /* DDC bus on graphics adapters */
 400 #define I2C_CLASS_SPD           (1<<7)  /* SPD EEPROMs and similar */
 401
 402 /* Internal numbers to terminate lists */
 403 #define I2C_CLIENT_END          0xfffeU
 404
 405 /* The numbers to use to set I2C bus address */
 406 #define ANY_I2C_BUS             0xffff
 407
 408 /* Construct an I2C_CLIENT_END-terminated array of i2c addresses */
 409 #define I2C_ADDRS(addr, addrs...) \
 410         ((const unsigned short []){ addr, ## addrs, I2C_CLIENT_END })
 411
 412
 413 /* ----- functions exported by i2c.o */
 414
 415 /* administration...
 416  */
 417 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 418 extern int i2c_add_adapter(struct i2c_adapter *);
 419 extern int i2c_del_adapter(struct i2c_adapter *);
 420 extern int i2c_add_numbered_adapter(struct i2c_adapter *);
 421
 422 extern int i2c_register_driver(struct module *, struct i2c_driver *);
 423 extern void i2c_del_driver(struct i2c_driver *);
 424
 425 static inline int i2c_add_driver(struct i2c_driver *driver)
 426 {
 427         return i2c_register_driver(THIS_MODULE, driver);
 428 }
 429
 430 extern struct i2c_client *i2c_use_client(struct i2c_client *client);
 431 extern void i2c_release_client(struct i2c_client *client);
 432
 433 /* call the i2c_client->command() of all attached clients with
 434  * the given arguments */
 435 extern void i2c_clients_command(struct i2c_adapter *adap,
 436                                 unsigned int cmd, void *arg);
 437
 438 extern struct i2c_adapter *i2c_get_adapter(int id);
 439 extern void i2c_put_adapter(struct i2c_adapter *adap);
 440
 441
 442 /* Return the functionality mask */
 443 static inline u32 i2c_get_functionality(struct i2c_adapter *adap)
 444 {
 445         return adap->algo->functionality(adap);
 446 }
 447
 448 /* Return 1 if adapter supports everything we need, 0 if not. */
 449 static inline int i2c_check_functionality(struct i2c_adapter *adap, u32 func)
 450 {
 451         return (func & i2c_get_functionality(adap)) == func;
 452 }
 453
 454 /* Return the adapter number for a specific adapter */
 455 static inline int i2c_adapter_id(struct i2c_adapter *adap)
 456 {
 457         return adap->nr;
 458 }
 459 #endif /* I2C */
 460 #endif /* __KERNEL__ */
 461
 462 /**
 463  * struct i2c_msg - an I2C transaction segment beginning with START
 464  * @addr: Slave address, either seven or ten bits.  When this is a ten
 465  *      bit address, I2C_M_TEN must be set in @flags and the adapter
 466  *      must support I2C_FUNC_10BIT_ADDR.
 467  * @flags: I2C_M_RD is handled by all adapters.  No other flags may be
 468  *      provided unless the adapter exported the relevant I2C_FUNC_*
 469  *      flags through i2c_check_functionality().
 470  * @len: Number of data bytes in @buf being read from or written to the
 471  *      I2C slave address.  For read transactions where I2C_M_RECV_LEN
 472  *      is set, the caller guarantees that this buffer can hold up to
 473  *      32 bytes in addition to the initial length byte sent by the
 474  *      slave (plus, if used, the SMBus PEC); and this value will be
 475  *      incremented by the number of block data bytes received.
 476  * @buf: The buffer into which data is read, or from which it's written.
 477  *
 478  * An i2c_msg is the low level representation of one segment of an I2C
 479  * transaction.  It is visible to drivers in the @i2c_transfer() procedure,
 480  * to userspace from i2c-dev, and to I2C adapter drivers through the
 481  * @i2c_adapter.@master_xfer() method.
 482  *
 483  * Except when I2C "protocol mangling" is used, all I2C adapters implement
 484  * the standard rules for I2C transactions.  Each transaction begins with a
 485  * START.  That is followed by the slave address, and a bit encoding read
 486  * versus write.  Then follow all the data bytes, possibly including a byte
 487  * with SMBus PEC.  The transfer terminates with a NAK, or when all those
 488  * bytes have been transferred and ACKed.  If this is the last message in a
 489  * group, it is followed by a STOP.  Otherwise it is followed by the next
 490  * @i2c_msg transaction segment, beginning with a (repeated) START.
 491  *
 492  * Alternatively, when the adapter supports I2C_FUNC_PROTOCOL_MANGLING then
 493  * passing certain @flags may have changed those standard protocol behaviors.
 494  * Those flags are only for use with broken/nonconforming slaves, and with
 495  * adapters which are known to support the specific mangling options they
 496  * need (one or more of IGNORE_NAK, NO_RD_ACK, NOSTART, and REV_DIR_ADDR).
 497  */
 498 struct i2c_msg {
 499         __u16 addr;     /* slave address                        */
 500         __u16 flags;
 501 #define I2C_M_TEN               0x0010  /* this is a ten bit chip address */
 502 #define I2C_M_RD                0x0001  /* read data, from slave to master */
 503 #define I2C_M_NOSTART           0x4000  /* if I2C_FUNC_PROTOCOL_MANGLING */
 504 #define I2C_M_REV_DIR_ADDR      0x2000  /* if I2C_FUNC_PROTOCOL_MANGLING */
 505 #define I2C_M_IGNORE_NAK        0x1000  /* if I2C_FUNC_PROTOCOL_MANGLING */
 506 #define I2C_M_NO_RD_ACK         0x0800  /* if I2C_FUNC_PROTOCOL_MANGLING */
 507 #define I2C_M_RECV_LEN          0x0400  /* length will be first received byte */
 508         __u16 len;              /* msg length                           */
 509         __u8 *buf;              /* pointer to msg data                  */
 510 };
 511
 512 /* To determine what functionality is present */
 513
 514 #define I2C_FUNC_I2C                    0x00000001
 515 #define I2C_FUNC_10BIT_ADDR             0x00000002
 516 #define I2C_FUNC_PROTOCOL_MANGLING      0x00000004 /* I2C_M_NOSTART etc. */
 517 #define I2C_FUNC_SMBUS_PEC              0x00000008
 518 #define I2C_FUNC_SMBUS_BLOCK_PROC_CALL  0x00008000 /* SMBus 2.0 */
 519 #define I2C_FUNC_SMBUS_QUICK            0x00010000
 520 #define I2C_FUNC_SMBUS_READ_BYTE        0x00020000
 521 #define I2C_FUNC_SMBUS_WRITE_BYTE       0x00040000
 522 #define I2C_FUNC_SMBUS_READ_BYTE_DATA   0x00080000
 523 #define I2C_FUNC_SMBUS_WRITE_BYTE_DATA  0x00100000
 524 #define I2C_FUNC_SMBUS_READ_WORD_DATA   0x00200000
 525 #define I2C_FUNC_SMBUS_WRITE_WORD_DATA  0x00400000
 526 #define I2C_FUNC_SMBUS_PROC_CALL        0x00800000
 527 #define I2C_FUNC_SMBUS_READ_BLOCK_DATA  0x01000000
 528 #define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA 0x02000000
 529 #define I2C_FUNC_SMBUS_READ_I2C_BLOCK   0x04000000 /* I2C-like block xfer  */
 530 #define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK  0x08000000 /* w/ 1-byte reg. addr. */
 531
 532 #define I2C_FUNC_SMBUS_BYTE             (I2C_FUNC_SMBUS_READ_BYTE | \
 533                                          I2C_FUNC_SMBUS_WRITE_BYTE)
 534 #define I2C_FUNC_SMBUS_BYTE_DATA        (I2C_FUNC_SMBUS_READ_BYTE_DATA | \
 535                                          I2C_FUNC_SMBUS_WRITE_BYTE_DATA)
 536 #define I2C_FUNC_SMBUS_WORD_DATA        (I2C_FUNC_SMBUS_READ_WORD_DATA | \
 537                                          I2C_FUNC_SMBUS_WRITE_WORD_DATA)
 538 #define I2C_FUNC_SMBUS_BLOCK_DATA       (I2C_FUNC_SMBUS_READ_BLOCK_DATA | \
 539                                          I2C_FUNC_SMBUS_WRITE_BLOCK_DATA)
 540 #define I2C_FUNC_SMBUS_I2C_BLOCK        (I2C_FUNC_SMBUS_READ_I2C_BLOCK | \
 541                                          I2C_FUNC_SMBUS_WRITE_I2C_BLOCK)
 542
 543 #define I2C_FUNC_SMBUS_EMUL             (I2C_FUNC_SMBUS_QUICK | \
 544                                          I2C_FUNC_SMBUS_BYTE | \
 545                                          I2C_FUNC_SMBUS_BYTE_DATA | \
 546                                          I2C_FUNC_SMBUS_WORD_DATA | \
 547                                          I2C_FUNC_SMBUS_PROC_CALL | \
 548                                          I2C_FUNC_SMBUS_WRITE_BLOCK_DATA | \
 549                                          I2C_FUNC_SMBUS_I2C_BLOCK | \
 550                                          I2C_FUNC_SMBUS_PEC)
 551
 552 /*
 553  * Data for SMBus Messages
 554  */
 555 #define I2C_SMBUS_BLOCK_MAX     32      /* As specified in SMBus standard */
 556 union i2c_smbus_data {
 557         __u8 byte;
 558         __u16 word;
 559         __u8 block[I2C_SMBUS_BLOCK_MAX + 2]; /* block[0] is used for length */
 560                                /* and one more for user-space compatibility */
 561 };
 562
 563 /* i2c_smbus_xfer read or write markers */
 564 #define I2C_SMBUS_READ  1
 565 #define I2C_SMBUS_WRITE 0
 566
 567 /* SMBus transaction types (size parameter in the above functions)
 568    Note: these no longer correspond to the (arbitrary) PIIX4 internal codes! */
 569 #define I2C_SMBUS_QUICK             0
 570 #define I2C_SMBUS_BYTE              1
 571 #define I2C_SMBUS_BYTE_DATA         2
 572 #define I2C_SMBUS_WORD_DATA         3
 573 #define I2C_SMBUS_PROC_CALL         4
 574 #define I2C_SMBUS_BLOCK_DATA        5
 575 #define I2C_SMBUS_I2C_BLOCK_BROKEN  6
 576 #define I2C_SMBUS_BLOCK_PROC_CALL   7           /* SMBus 2.0 */
 577 #define I2C_SMBUS_I2C_BLOCK_DATA    8
 578
 579 #endif /* _LINUX_I2C_H */