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 #include <linux/of.h>           /* for struct device_node */
  38
  39 extern struct bus_type i2c_bus_type;
  40
  41 /* --- General options ------------------------------------------------ */
  42
  43 struct i2c_msg;
  44 struct i2c_algorithm;
  45 struct i2c_adapter;
  46 struct i2c_client;
  47 struct i2c_driver;
  48 union i2c_smbus_data;
  49 struct i2c_board_info;
  50
  51 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
  52 /*
  53  * The master routines are the ones normally used to transmit data to devices
  54  * on a bus (or read from them). Apart from two basic transfer functions to
  55  * transmit one message at a time, a more complex version can be used to
  56  * transmit an arbitrary number of messages without interruption.
  57  * @count must be be less than 64k since msg.len is u16.
  58  */
  59 extern int i2c_master_send(struct i2c_client *client, const char *buf,
  60                            int count);
  61 extern int i2c_master_recv(struct i2c_client *client, char *buf, int count);
  62
  63 /* Transfer num messages.
  64  */
  65 extern int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
  66                         int num);
  67
  68 /* This is the very generalized SMBus access routine. You probably do not
  69    want to use this, though; one of the functions below may be much easier,
  70    and probably just as fast.
  71    Note that we use i2c_adapter here, because you do not need a specific
  72    smbus adapter to call this function. */
  73 extern s32 i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr,
  74                           unsigned short flags, char read_write, u8 command,
  75                           int size, union i2c_smbus_data *data);
  76
  77 /* Now follow the 'nice' access routines. These also document the calling
  78    conventions of i2c_smbus_xfer. */
  79
  80 extern s32 i2c_smbus_read_byte(struct i2c_client *client);
  81 extern s32 i2c_smbus_write_byte(struct i2c_client *client, u8 value);
  82 extern s32 i2c_smbus_read_byte_data(struct i2c_client *client, u8 command);
  83 extern s32 i2c_smbus_write_byte_data(struct i2c_client *client,
  84                                      u8 command, u8 value);
  85 extern s32 i2c_smbus_read_word_data(struct i2c_client *client, u8 command);
  86 extern s32 i2c_smbus_write_word_data(struct i2c_client *client,
  87                                      u8 command, u16 value);
  88 /* Returns the number of read bytes */
  89 extern s32 i2c_smbus_read_block_data(struct i2c_client *client,
  90                                      u8 command, u8 *values);
  91 extern s32 i2c_smbus_write_block_data(struct i2c_client *client,
  92                                       u8 command, u8 length, const u8 *values);
  93 /* Returns the number of read bytes */
  94 extern s32 i2c_smbus_read_i2c_block_data(struct i2c_client *client,
  95                                          u8 command, u8 length, u8 *values);
  96 extern s32 i2c_smbus_write_i2c_block_data(struct i2c_client *client,
  97                                           u8 command, u8 length,
  98                                           const u8 *values);
  99 #endif /* I2C */
 100
 101 /**
 102  * struct i2c_driver - represent an I2C device driver
 103  * @class: What kind of i2c device we instantiate (for detect)
 104  * @attach_adapter: Callback for bus addition (for legacy drivers)
 105  * @detach_adapter: Callback for bus removal (for legacy drivers)
 106  * @probe: Callback for device binding
 107  * @remove: Callback for device unbinding
 108  * @shutdown: Callback for device shutdown
 109  * @suspend: Callback for device suspend
 110  * @resume: Callback for device resume
 111  * @command: Callback for bus-wide signaling (optional)
 112  * @driver: Device driver model driver
 113  * @id_table: List of I2C devices supported by this driver
 114  * @detect: Callback for device detection
 115  * @address_list: The I2C addresses to probe (for detect)
 116  * @clients: List of detected clients we created (for i2c-core use only)
 117  *
 118  * The driver.owner field should be set to the module owner of this driver.
 119  * The driver.name field should be set to the name of this driver.
 120  *
 121  * For automatic device detection, both @detect and @address_data must
 122  * be defined. @class should also be set, otherwise only devices forced
 123  * with module parameters will be created. The detect function must
 124  * fill at least the name field of the i2c_board_info structure it is
 125  * handed upon successful detection, and possibly also the flags field.
 126  *
 127  * If @detect is missing, the driver will still work fine for enumerated
 128  * devices. Detected devices simply won't be supported. This is expected
 129  * for the many I2C/SMBus devices which can't be detected reliably, and
 130  * the ones which can always be enumerated in practice.
 131  *
 132  * The i2c_client structure which is handed to the @detect callback is
 133  * not a real i2c_client. It is initialized just enough so that you can
 134  * call i2c_smbus_read_byte_data and friends on it. Don't do anything
 135  * else with it. In particular, calling dev_dbg and friends on it is
 136  * not allowed.
 137  */
 138 struct i2c_driver {
 139         unsigned int class;
 140
 141         /* Notifies the driver that a new bus has appeared or is about to be
 142          * removed. You should avoid using this if you can, it will probably
 143          * be removed in a near future.
 144          */
 145         int (*attach_adapter)(struct i2c_adapter *);
 146         int (*detach_adapter)(struct i2c_adapter *);
 147
 148         /* Standard driver model interfaces */
 149         int (*probe)(struct i2c_client *, const struct i2c_device_id *);
 150         int (*remove)(struct i2c_client *);
 151
 152         /* driver model interfaces that don't relate to enumeration  */
 153         void (*shutdown)(struct i2c_client *);
 154         int (*suspend)(struct i2c_client *, pm_message_t mesg);
 155         int (*resume)(struct i2c_client *);
 156
 157         /* Alert callback, for example for the SMBus alert protocol.
 158          * The format and meaning of the data value depends on the protocol.
 159          * For the SMBus alert protocol, there is a single bit of data passed
 160          * as the alert response's low bit ("event flag").
 161          */
 162         void (*alert)(struct i2c_client *, unsigned int data);
 163
 164         /* a ioctl like command that can be used to perform specific functions
 165          * with the device.
 166          */
 167         int (*command)(struct i2c_client *client, unsigned int cmd, void *arg);
 168
 169         struct device_driver driver;
 170         const struct i2c_device_id *id_table;
 171
 172         /* Device detection callback for automatic device creation */
 173         int (*detect)(struct i2c_client *, struct i2c_board_info *);
 174         const unsigned short *address_list;
 175         struct list_head clients;
 176 };
 177 #define to_i2c_driver(d) container_of(d, struct i2c_driver, driver)
 178
 179 /**
 180  * struct i2c_client - represent an I2C slave device
 181  * @flags: I2C_CLIENT_TEN indicates the device uses a ten bit chip address;
 182  *      I2C_CLIENT_PEC indicates it uses SMBus Packet Error Checking
 183  * @addr: Address used on the I2C bus connected to the parent adapter.
 184  * @name: Indicates the type of the device, usually a chip name that's
 185  *      generic enough to hide second-sourcing and compatible revisions.
 186  * @adapter: manages the bus segment hosting this I2C device
 187  * @driver: device's driver, hence pointer to access routines
 188  * @dev: Driver model device node for the slave.
 189  * @irq: indicates the IRQ generated by this device (if any)
 190  * @detected: member of an i2c_driver.clients list or i2c-core's
 191  *      userspace_devices list
 192  *
 193  * An i2c_client identifies a single device (i.e. chip) connected to an
 194  * i2c bus. The behaviour exposed to Linux is defined by the driver
 195  * managing the device.
 196  */
 197 struct i2c_client {
 198         unsigned short flags;           /* div., see below              */
 199         unsigned short addr;            /* chip address - NOTE: 7bit    */
 200                                         /* addresses are stored in the  */
 201                                         /* _LOWER_ 7 bits               */
 202         char name[I2C_NAME_SIZE];
 203         struct i2c_adapter *adapter;    /* the adapter we sit on        */
 204         struct i2c_driver *driver;      /* and our access routines      */
 205         struct device dev;              /* the device structure         */
 206         int irq;                        /* irq issued by device         */
 207         struct list_head detected;
 208 };
 209 #define to_i2c_client(d) container_of(d, struct i2c_client, dev)
 210
 211 extern struct i2c_client *i2c_verify_client(struct device *dev);
 212
 213 static inline struct i2c_client *kobj_to_i2c_client(struct kobject *kobj)
 214 {
 215         struct device * const dev = container_of(kobj, struct device, kobj);
 216         return to_i2c_client(dev);
 217 }
 218
 219 static inline void *i2c_get_clientdata(const struct i2c_client *dev)
 220 {
 221         return dev_get_drvdata(&dev->dev);
 222 }
 223
 224 static inline void i2c_set_clientdata(struct i2c_client *dev, void *data)
 225 {
 226         dev_set_drvdata(&dev->dev, data);
 227 }
 228
 229 /**
 230  * struct i2c_board_info - template for device creation
 231  * @type: chip type, to initialize i2c_client.name
 232  * @flags: to initialize i2c_client.flags
 233  * @addr: stored in i2c_client.addr
 234  * @platform_data: stored in i2c_client.dev.platform_data
 235  * @archdata: copied into i2c_client.dev.archdata
 236  * @irq: stored in i2c_client.irq
 237  *
 238  * I2C doesn't actually support hardware probing, although controllers and
 239  * devices may be able to use I2C_SMBUS_QUICK to tell whether or not there's
 240  * a device at a given address.  Drivers commonly need more information than
 241  * that, such as chip type, configuration, associated IRQ, and so on.
 242  *
 243  * i2c_board_info is used to build tables of information listing I2C devices
 244  * that are present.  This information is used to grow the driver model tree.
 245  * For mainboards this is done statically using i2c_register_board_info();
 246  * bus numbers identify adapters that aren't yet available.  For add-on boards,
 247  * i2c_new_device() does this dynamically with the adapter already known.
 248  */
 249 struct i2c_board_info {
 250         char            type[I2C_NAME_SIZE];
 251         unsigned short  flags;
 252         unsigned short  addr;
 253         void            *platform_data;
 254         struct dev_archdata     *archdata;
 255 #ifdef CONFIG_OF
 256         struct device_node *of_node;
 257 #endif
 258         int             irq;
 259 };
 260
 261 /**
 262  * I2C_BOARD_INFO - macro used to list an i2c device and its address
 263  * @dev_type: identifies the device type
 264  * @dev_addr: the device's address on the bus.
 265  *
 266  * This macro initializes essential fields of a struct i2c_board_info,
 267  * declaring what has been provided on a particular board.  Optional
 268  * fields (such as associated irq, or device-specific platform_data)
 269  * are provided using conventional syntax.
 270  */
 271 #define I2C_BOARD_INFO(dev_type, dev_addr) \
 272         .type = dev_type, .addr = (dev_addr)
 273
 274
 275 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 276 /* Add-on boards should register/unregister their devices; e.g. a board
 277  * with integrated I2C, a config eeprom, sensors, and a codec that's
 278  * used in conjunction with the primary hardware.
 279  */
 280 extern struct i2c_client *
 281 i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info);
 282
 283 /* If you don't know the exact address of an I2C device, use this variant
 284  * instead, which can probe for device presence in a list of possible
 285  * addresses.
 286  */
 287 extern struct i2c_client *
 288 i2c_new_probed_device(struct i2c_adapter *adap,
 289                       struct i2c_board_info *info,
 290                       unsigned short const *addr_list);
 291
 292 /* For devices that use several addresses, use i2c_new_dummy() to make
 293  * client handles for the extra addresses.
 294  */
 295 extern struct i2c_client *
 296 i2c_new_dummy(struct i2c_adapter *adap, u16 address);
 297
 298 extern void i2c_unregister_device(struct i2c_client *);
 299 #endif /* I2C */
 300
 301 /* Mainboard arch_initcall() code should register all its I2C devices.
 302  * This is done at arch_initcall time, before declaring any i2c adapters.
 303  * Modules for add-on boards must use other calls.
 304  */
 305 #ifdef CONFIG_I2C_BOARDINFO
 306 extern int
 307 i2c_register_board_info(int busnum, struct i2c_board_info const *info,
 308                         unsigned n);
 309 #else
 310 static inline int
 311 i2c_register_board_info(int busnum, struct i2c_board_info const *info,
 312                         unsigned n)
 313 {
 314         return 0;
 315 }
 316 #endif /* I2C_BOARDINFO */
 317
 318 /*
 319  * The following structs are for those who like to implement new bus drivers:
 320  * i2c_algorithm is the interface to a class of hardware solutions which can
 321  * be addressed using the same bus algorithms - i.e. bit-banging or the PCF8584
 322  * to name two of the most common.
 323  */
 324 struct i2c_algorithm {
 325         /* If an adapter algorithm can't do I2C-level access, set master_xfer
 326            to NULL. If an adapter algorithm can do SMBus access, set
 327            smbus_xfer. If set to NULL, the SMBus protocol is simulated
 328            using common I2C messages */
 329         /* master_xfer should return the number of messages successfully
 330            processed, or a negative value on error */
 331         int (*master_xfer)(struct i2c_adapter *adap, struct i2c_msg *msgs,
 332                            int num);
 333         int (*smbus_xfer) (struct i2c_adapter *adap, u16 addr,
 334                            unsigned short flags, char read_write,
 335                            u8 command, int size, union i2c_smbus_data *data);
 336
 337         /* To determine what the adapter supports */
 338         u32 (*functionality) (struct i2c_adapter *);
 339 };
 340
 341 /*
 342  * i2c_adapter is the structure used to identify a physical i2c bus along
 343  * with the access algorithms necessary to access it.
 344  */
 345 struct i2c_adapter {
 346         struct module *owner;
 347         unsigned int id;
 348         unsigned int class;               /* classes to allow probing for */
 349         const struct i2c_algorithm *algo; /* the algorithm to access the bus */
 350         void *algo_data;
 351
 352         /* data fields that are valid for all devices   */
 353         struct rt_mutex bus_lock;
 354
 355         int timeout;                    /* in jiffies */
 356         int retries;
 357         struct device dev;              /* the adapter device */
 358
 359         int nr;
 360         char name[48];
 361         struct completion dev_released;
 362
 363         struct list_head userspace_clients;
 364 };
 365 #define to_i2c_adapter(d) container_of(d, struct i2c_adapter, dev)
 366
 367 static inline void *i2c_get_adapdata(const struct i2c_adapter *dev)
 368 {
 369         return dev_get_drvdata(&dev->dev);
 370 }
 371
 372 static inline void i2c_set_adapdata(struct i2c_adapter *dev, void *data)
 373 {
 374         dev_set_drvdata(&dev->dev, data);
 375 }
 376
 377 /**
 378  * i2c_lock_adapter - Prevent access to an I2C bus segment
 379  * @adapter: Target I2C bus segment
 380  */
 381 static inline void i2c_lock_adapter(struct i2c_adapter *adapter)
 382 {
 383         rt_mutex_lock(&adapter->bus_lock);
 384 }
 385
 386 /**
 387  * i2c_unlock_adapter - Reauthorize access to an I2C bus segment
 388  * @adapter: Target I2C bus segment
 389  */
 390 static inline void i2c_unlock_adapter(struct i2c_adapter *adapter)
 391 {
 392         rt_mutex_unlock(&adapter->bus_lock);
 393 }
 394
 395 /*flags for the client struct: */
 396 #define I2C_CLIENT_PEC  0x04            /* Use Packet Error Checking */
 397 #define I2C_CLIENT_TEN  0x10            /* we have a ten bit chip address */
 398                                         /* Must equal I2C_M_TEN below */
 399 #define I2C_CLIENT_WAKE 0x80            /* for board_info; true iff can wake */
 400
 401 /* i2c adapter classes (bitmask) */
 402 #define I2C_CLASS_HWMON         (1<<0)  /* lm_sensors, ... */
 403 #define I2C_CLASS_TV_ANALOG     (1<<1)  /* bttv + friends */
 404 #define I2C_CLASS_TV_DIGITAL    (1<<2)  /* dvb cards */
 405 #define I2C_CLASS_DDC           (1<<3)  /* DDC bus on graphics adapters */
 406 #define I2C_CLASS_SPD           (1<<7)  /* SPD EEPROMs and similar */
 407
 408 /* Internal numbers to terminate lists */
 409 #define I2C_CLIENT_END          0xfffeU
 410
 411 /* The numbers to use to set I2C bus address */
 412 #define ANY_I2C_BUS             0xffff
 413
 414 /* Construct an I2C_CLIENT_END-terminated array of i2c addresses */
 415 #define I2C_ADDRS(addr, addrs...) \
 416         ((const unsigned short []){ addr, ## addrs, I2C_CLIENT_END })
 417
 418
 419 /* ----- functions exported by i2c.o */
 420
 421 /* administration...
 422  */
 423 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 424 extern int i2c_add_adapter(struct i2c_adapter *);
 425 extern int i2c_del_adapter(struct i2c_adapter *);
 426 extern int i2c_add_numbered_adapter(struct i2c_adapter *);
 427
 428 extern int i2c_register_driver(struct module *, struct i2c_driver *);
 429 extern void i2c_del_driver(struct i2c_driver *);
 430
 431 static inline int i2c_add_driver(struct i2c_driver *driver)
 432 {
 433         return i2c_register_driver(THIS_MODULE, driver);
 434 }
 435
 436 extern struct i2c_client *i2c_use_client(struct i2c_client *client);
 437 extern void i2c_release_client(struct i2c_client *client);
 438
 439 /* call the i2c_client->command() of all attached clients with
 440  * the given arguments */
 441 extern void i2c_clients_command(struct i2c_adapter *adap,
 442                                 unsigned int cmd, void *arg);
 443
 444 extern struct i2c_adapter *i2c_get_adapter(int id);
 445 extern void i2c_put_adapter(struct i2c_adapter *adap);
 446
 447
 448 /* Return the functionality mask */
 449 static inline u32 i2c_get_functionality(struct i2c_adapter *adap)
 450 {
 451         return adap->algo->functionality(adap);
 452 }
 453
 454 /* Return 1 if adapter supports everything we need, 0 if not. */
 455 static inline int i2c_check_functionality(struct i2c_adapter *adap, u32 func)
 456 {
 457         return (func & i2c_get_functionality(adap)) == func;
 458 }
 459
 460 /* Return the adapter number for a specific adapter */
 461 static inline int i2c_adapter_id(struct i2c_adapter *adap)
 462 {
 463         return adap->nr;
 464 }
 465 #endif /* I2C */
 466 #endif /* __KERNEL__ */
 467
 468 /**
 469  * struct i2c_msg - an I2C transaction segment beginning with START
 470  * @addr: Slave address, either seven or ten bits.  When this is a ten
 471  *      bit address, I2C_M_TEN must be set in @flags and the adapter
 472  *      must support I2C_FUNC_10BIT_ADDR.
 473  * @flags: I2C_M_RD is handled by all adapters.  No other flags may be
 474  *      provided unless the adapter exported the relevant I2C_FUNC_*
 475  *      flags through i2c_check_functionality().
 476  * @len: Number of data bytes in @buf being read from or written to the
 477  *      I2C slave address.  For read transactions where I2C_M_RECV_LEN
 478  *      is set, the caller guarantees that this buffer can hold up to
 479  *      32 bytes in addition to the initial length byte sent by the
 480  *      slave (plus, if used, the SMBus PEC); and this value will be
 481  *      incremented by the number of block data bytes received.
 482  * @buf: The buffer into which data is read, or from which it's written.
 483  *
 484  * An i2c_msg is the low level representation of one segment of an I2C
 485  * transaction.  It is visible to drivers in the @i2c_transfer() procedure,
 486  * to userspace from i2c-dev, and to I2C adapter drivers through the
 487  * @i2c_adapter.@master_xfer() method.
 488  *
 489  * Except when I2C "protocol mangling" is used, all I2C adapters implement
 490  * the standard rules for I2C transactions.  Each transaction begins with a
 491  * START.  That is followed by the slave address, and a bit encoding read
 492  * versus write.  Then follow all the data bytes, possibly including a byte
 493  * with SMBus PEC.  The transfer terminates with a NAK, or when all those
 494  * bytes have been transferred and ACKed.  If this is the last message in a
 495  * group, it is followed by a STOP.  Otherwise it is followed by the next
 496  * @i2c_msg transaction segment, beginning with a (repeated) START.
 497  *
 498  * Alternatively, when the adapter supports I2C_FUNC_PROTOCOL_MANGLING then
 499  * passing certain @flags may have changed those standard protocol behaviors.
 500  * Those flags are only for use with broken/nonconforming slaves, and with
 501  * adapters which are known to support the specific mangling options they
 502  * need (one or more of IGNORE_NAK, NO_RD_ACK, NOSTART, and REV_DIR_ADDR).
 503  */
 504 struct i2c_msg {
 505         __u16 addr;     /* slave address                        */
 506         __u16 flags;
 507 #define I2C_M_TEN               0x0010  /* this is a ten bit chip address */
 508 #define I2C_M_RD                0x0001  /* read data, from slave to master */
 509 #define I2C_M_NOSTART           0x4000  /* if I2C_FUNC_PROTOCOL_MANGLING */
 510 #define I2C_M_REV_DIR_ADDR      0x2000  /* if I2C_FUNC_PROTOCOL_MANGLING */
 511 #define I2C_M_IGNORE_NAK        0x1000  /* if I2C_FUNC_PROTOCOL_MANGLING */
 512 #define I2C_M_NO_RD_ACK         0x0800  /* if I2C_FUNC_PROTOCOL_MANGLING */
 513 #define I2C_M_RECV_LEN          0x0400  /* length will be first received byte */
 514         __u16 len;              /* msg length                           */
 515         __u8 *buf;              /* pointer to msg data                  */
 516 };
 517
 518 /* To determine what functionality is present */
 519
 520 #define I2C_FUNC_I2C                    0x00000001
 521 #define I2C_FUNC_10BIT_ADDR             0x00000002
 522 #define I2C_FUNC_PROTOCOL_MANGLING      0x00000004 /* I2C_M_NOSTART etc. */
 523 #define I2C_FUNC_SMBUS_PEC              0x00000008
 524 #define I2C_FUNC_SMBUS_BLOCK_PROC_CALL  0x00008000 /* SMBus 2.0 */
 525 #define I2C_FUNC_SMBUS_QUICK            0x00010000
 526 #define I2C_FUNC_SMBUS_READ_BYTE        0x00020000
 527 #define I2C_FUNC_SMBUS_WRITE_BYTE       0x00040000
 528 #define I2C_FUNC_SMBUS_READ_BYTE_DATA   0x00080000
 529 #define I2C_FUNC_SMBUS_WRITE_BYTE_DATA  0x00100000
 530 #define I2C_FUNC_SMBUS_READ_WORD_DATA   0x00200000
 531 #define I2C_FUNC_SMBUS_WRITE_WORD_DATA  0x00400000
 532 #define I2C_FUNC_SMBUS_PROC_CALL        0x00800000
 533 #define I2C_FUNC_SMBUS_READ_BLOCK_DATA  0x01000000
 534 #define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA 0x02000000
 535 #define I2C_FUNC_SMBUS_READ_I2C_BLOCK   0x04000000 /* I2C-like block xfer  */
 536 #define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK  0x08000000 /* w/ 1-byte reg. addr. */
 537
 538 #define I2C_FUNC_SMBUS_BYTE             (I2C_FUNC_SMBUS_READ_BYTE | \
 539                                          I2C_FUNC_SMBUS_WRITE_BYTE)
 540 #define I2C_FUNC_SMBUS_BYTE_DATA        (I2C_FUNC_SMBUS_READ_BYTE_DATA | \
 541                                          I2C_FUNC_SMBUS_WRITE_BYTE_DATA)
 542 #define I2C_FUNC_SMBUS_WORD_DATA        (I2C_FUNC_SMBUS_READ_WORD_DATA | \
 543                                          I2C_FUNC_SMBUS_WRITE_WORD_DATA)
 544 #define I2C_FUNC_SMBUS_BLOCK_DATA       (I2C_FUNC_SMBUS_READ_BLOCK_DATA | \
 545                                          I2C_FUNC_SMBUS_WRITE_BLOCK_DATA)
 546 #define I2C_FUNC_SMBUS_I2C_BLOCK        (I2C_FUNC_SMBUS_READ_I2C_BLOCK | \
 547                                          I2C_FUNC_SMBUS_WRITE_I2C_BLOCK)
 548
 549 #define I2C_FUNC_SMBUS_EMUL             (I2C_FUNC_SMBUS_QUICK | \
 550                                          I2C_FUNC_SMBUS_BYTE | \
 551                                          I2C_FUNC_SMBUS_BYTE_DATA | \
 552                                          I2C_FUNC_SMBUS_WORD_DATA | \
 553                                          I2C_FUNC_SMBUS_PROC_CALL | \
 554                                          I2C_FUNC_SMBUS_WRITE_BLOCK_DATA | \
 555                                          I2C_FUNC_SMBUS_I2C_BLOCK | \
 556                                          I2C_FUNC_SMBUS_PEC)
 557
 558 /*
 559  * Data for SMBus Messages
 560  */
 561 #define I2C_SMBUS_BLOCK_MAX     32      /* As specified in SMBus standard */
 562 union i2c_smbus_data {
 563         __u8 byte;
 564         __u16 word;
 565         __u8 block[I2C_SMBUS_BLOCK_MAX + 2]; /* block[0] is used for length */
 566                                /* and one more for user-space compatibility */
 567 };
 568
 569 /* i2c_smbus_xfer read or write markers */
 570 #define I2C_SMBUS_READ  1
 571 #define I2C_SMBUS_WRITE 0
 572
 573 /* SMBus transaction types (size parameter in the above functions)
 574    Note: these no longer correspond to the (arbitrary) PIIX4 internal codes! */
 575 #define I2C_SMBUS_QUICK             0
 576 #define I2C_SMBUS_BYTE              1
 577 #define I2C_SMBUS_BYTE_DATA         2
 578 #define I2C_SMBUS_WORD_DATA         3
 579 #define I2C_SMBUS_PROC_CALL         4
 580 #define I2C_SMBUS_BLOCK_DATA        5
 581 #define I2C_SMBUS_I2C_BLOCK_BROKEN  6
 582 #define I2C_SMBUS_BLOCK_PROC_CALL   7           /* SMBus 2.0 */
 583 #define I2C_SMBUS_I2C_BLOCK_DATA    8
 584
 585 #endif /* _LINUX_I2C_H */