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  */
  57 extern int i2c_master_send(struct i2c_client *client, const char *buf,
  58                            int count);
  59 extern int i2c_master_recv(struct i2c_client *client, char *buf, int count);
  60
  61 /* Transfer num messages.
  62  */
  63 extern int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
  64                         int num);
  65
  66 /* This is the very generalized SMBus access routine. You probably do not
  67    want to use this, though; one of the functions below may be much easier,
  68    and probably just as fast.
  69    Note that we use i2c_adapter here, because you do not need a specific
  70    smbus adapter to call this function. */
  71 extern s32 i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr,
  72                           unsigned short flags, char read_write, u8 command,
  73                           int size, union i2c_smbus_data *data);
  74
  75 /* Now follow the 'nice' access routines. These also document the calling
  76    conventions of i2c_smbus_xfer. */
  77
  78 extern s32 i2c_smbus_read_byte(struct i2c_client *client);
  79 extern s32 i2c_smbus_write_byte(struct i2c_client *client, u8 value);
  80 extern s32 i2c_smbus_read_byte_data(struct i2c_client *client, u8 command);
  81 extern s32 i2c_smbus_write_byte_data(struct i2c_client *client,
  82                                      u8 command, u8 value);
  83 extern s32 i2c_smbus_read_word_data(struct i2c_client *client, u8 command);
  84 extern s32 i2c_smbus_write_word_data(struct i2c_client *client,
  85                                      u8 command, u16 value);
  86 /* Returns the number of read bytes */
  87 extern s32 i2c_smbus_read_block_data(struct i2c_client *client,
  88                                      u8 command, u8 *values);
  89 extern s32 i2c_smbus_write_block_data(struct i2c_client *client,
  90                                       u8 command, u8 length, const u8 *values);
  91 /* Returns the number of read bytes */
  92 extern s32 i2c_smbus_read_i2c_block_data(struct i2c_client *client,
  93                                          u8 command, u8 length, u8 *values);
  94 extern s32 i2c_smbus_write_i2c_block_data(struct i2c_client *client,
  95                                           u8 command, u8 length,
  96                                           const u8 *values);
  97 #endif /* I2C */
  98
  99 /**
 100  * struct i2c_driver - represent an I2C device driver
 101  * @id: Unique driver ID (optional)
 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_data: The I2C addresses to probe, ignore or force (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         int id;
 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         /* a ioctl like command that can be used to perform specific functions
 158          * with the device.
 159          */
 160         int (*command)(struct i2c_client *client, unsigned int cmd, void *arg);
 161
 162         struct device_driver driver;
 163         const struct i2c_device_id *id_table;
 164
 165         /* Device detection callback for automatic device creation */
 166         int (*detect)(struct i2c_client *, int kind, struct i2c_board_info *);
 167         const struct i2c_client_address_data *address_data;
 168         struct list_head clients;
 169 };
 170 #define to_i2c_driver(d) container_of(d, struct i2c_driver, driver)
 171
 172 /**
 173  * struct i2c_client - represent an I2C slave device
 174  * @flags: I2C_CLIENT_TEN indicates the device uses a ten bit chip address;
 175  *      I2C_CLIENT_PEC indicates it uses SMBus Packet Error Checking
 176  * @addr: Address used on the I2C bus connected to the parent adapter.
 177  * @name: Indicates the type of the device, usually a chip name that's
 178  *      generic enough to hide second-sourcing and compatible revisions.
 179  * @adapter: manages the bus segment hosting this I2C device
 180  * @driver: device's driver, hence pointer to access routines
 181  * @dev: Driver model device node for the slave.
 182  * @irq: indicates the IRQ generated by this device (if any)
 183  * @detected: member of an i2c_driver.clients list or i2c-core's
 184  *      userspace_devices list
 185  *
 186  * An i2c_client identifies a single device (i.e. chip) connected to an
 187  * i2c bus. The behaviour exposed to Linux is defined by the driver
 188  * managing the device.
 189  */
 190 struct i2c_client {
 191         unsigned short flags;           /* div., see below              */
 192         unsigned short addr;            /* chip address - NOTE: 7bit    */
 193                                         /* addresses are stored in the  */
 194                                         /* _LOWER_ 7 bits               */
 195         char name[I2C_NAME_SIZE];
 196         struct i2c_adapter *adapter;    /* the adapter we sit on        */
 197         struct i2c_driver *driver;      /* and our access routines      */
 198         struct device dev;              /* the device structure         */
 199         int irq;                        /* irq issued by device         */
 200         struct list_head detected;
 201 };
 202 #define to_i2c_client(d) container_of(d, struct i2c_client, dev)
 203
 204 extern struct i2c_client *i2c_verify_client(struct device *dev);
 205
 206 static inline struct i2c_client *kobj_to_i2c_client(struct kobject *kobj)
 207 {
 208         struct device * const dev = container_of(kobj, struct device, kobj);
 209         return to_i2c_client(dev);
 210 }
 211
 212 static inline void *i2c_get_clientdata(const struct i2c_client *dev)
 213 {
 214         return dev_get_drvdata(&dev->dev);
 215 }
 216
 217 static inline void i2c_set_clientdata(struct i2c_client *dev, void *data)
 218 {
 219         dev_set_drvdata(&dev->dev, data);
 220 }
 221
 222 /**
 223  * struct i2c_board_info - template for device creation
 224  * @type: chip type, to initialize i2c_client.name
 225  * @flags: to initialize i2c_client.flags
 226  * @addr: stored in i2c_client.addr
 227  * @platform_data: stored in i2c_client.dev.platform_data
 228  * @archdata: copied into i2c_client.dev.archdata
 229  * @irq: stored in i2c_client.irq
 230  *
 231  * I2C doesn't actually support hardware probing, although controllers and
 232  * devices may be able to use I2C_SMBUS_QUICK to tell whether or not there's
 233  * a device at a given address.  Drivers commonly need more information than
 234  * that, such as chip type, configuration, associated IRQ, and so on.
 235  *
 236  * i2c_board_info is used to build tables of information listing I2C devices
 237  * that are present.  This information is used to grow the driver model tree.
 238  * For mainboards this is done statically using i2c_register_board_info();
 239  * bus numbers identify adapters that aren't yet available.  For add-on boards,
 240  * i2c_new_device() does this dynamically with the adapter already known.
 241  */
 242 struct i2c_board_info {
 243         char            type[I2C_NAME_SIZE];
 244         unsigned short  flags;
 245         unsigned short  addr;
 246         void            *platform_data;
 247         struct dev_archdata     *archdata;
 248         int             irq;
 249 };
 250
 251 /**
 252  * I2C_BOARD_INFO - macro used to list an i2c device and its address
 253  * @dev_type: identifies the device type
 254  * @dev_addr: the device's address on the bus.
 255  *
 256  * This macro initializes essential fields of a struct i2c_board_info,
 257  * declaring what has been provided on a particular board.  Optional
 258  * fields (such as associated irq, or device-specific platform_data)
 259  * are provided using conventional syntax.
 260  */
 261 #define I2C_BOARD_INFO(dev_type, dev_addr) \
 262         .type = dev_type, .addr = (dev_addr)
 263
 264
 265 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 266 /* Add-on boards should register/unregister their devices; e.g. a board
 267  * with integrated I2C, a config eeprom, sensors, and a codec that's
 268  * used in conjunction with the primary hardware.
 269  */
 270 extern struct i2c_client *
 271 i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info);
 272
 273 /* If you don't know the exact address of an I2C device, use this variant
 274  * instead, which can probe for device presence in a list of possible
 275  * addresses.
 276  */
 277 extern struct i2c_client *
 278 i2c_new_probed_device(struct i2c_adapter *adap,
 279                       struct i2c_board_info *info,
 280                       unsigned short const *addr_list);
 281
 282 /* For devices that use several addresses, use i2c_new_dummy() to make
 283  * client handles for the extra addresses.
 284  */
 285 extern struct i2c_client *
 286 i2c_new_dummy(struct i2c_adapter *adap, u16 address);
 287
 288 extern void i2c_unregister_device(struct i2c_client *);
 289 #endif /* I2C */
 290
 291 /* Mainboard arch_initcall() code should register all its I2C devices.
 292  * This is done at arch_initcall time, before declaring any i2c adapters.
 293  * Modules for add-on boards must use other calls.
 294  */
 295 #ifdef CONFIG_I2C_BOARDINFO
 296 extern int
 297 i2c_register_board_info(int busnum, struct i2c_board_info const *info,
 298                         unsigned n);
 299 #else
 300 static inline int
 301 i2c_register_board_info(int busnum, struct i2c_board_info const *info,
 302                         unsigned n)
 303 {
 304         return 0;
 305 }
 306 #endif /* I2C_BOARDINFO */
 307
 308 /*
 309  * The following structs are for those who like to implement new bus drivers:
 310  * i2c_algorithm is the interface to a class of hardware solutions which can
 311  * be addressed using the same bus algorithms - i.e. bit-banging or the PCF8584
 312  * to name two of the most common.
 313  */
 314 struct i2c_algorithm {
 315         /* If an adapter algorithm can't do I2C-level access, set master_xfer
 316            to NULL. If an adapter algorithm can do SMBus access, set
 317            smbus_xfer. If set to NULL, the SMBus protocol is simulated
 318            using common I2C messages */
 319         /* master_xfer should return the number of messages successfully
 320            processed, or a negative value on error */
 321         int (*master_xfer)(struct i2c_adapter *adap, struct i2c_msg *msgs,
 322                            int num);
 323         int (*smbus_xfer) (struct i2c_adapter *adap, u16 addr,
 324                            unsigned short flags, char read_write,
 325                            u8 command, int size, union i2c_smbus_data *data);
 326
 327         /* To determine what the adapter supports */
 328         u32 (*functionality) (struct i2c_adapter *);
 329 };
 330
 331 /*
 332  * i2c_adapter is the structure used to identify a physical i2c bus along
 333  * with the access algorithms necessary to access it.
 334  */
 335 struct i2c_adapter {
 336         struct module *owner;
 337         unsigned int id;
 338         unsigned int class;               /* classes to allow probing for */
 339         const struct i2c_algorithm *algo; /* the algorithm to access the bus */
 340         void *algo_data;
 341
 342         /* data fields that are valid for all devices   */
 343         u8 level;                       /* nesting level for lockdep */
 344         struct mutex bus_lock;
 345
 346         int timeout;                    /* in jiffies */
 347         int retries;
 348         struct device dev;              /* the adapter device */
 349
 350         int nr;
 351         char name[48];
 352         struct completion dev_released;
 353 };
 354 #define to_i2c_adapter(d) container_of(d, struct i2c_adapter, dev)
 355
 356 static inline void *i2c_get_adapdata(const struct i2c_adapter *dev)
 357 {
 358         return dev_get_drvdata(&dev->dev);
 359 }
 360
 361 static inline void i2c_set_adapdata(struct i2c_adapter *dev, void *data)
 362 {
 363         dev_set_drvdata(&dev->dev, data);
 364 }
 365
 366 /*flags for the client struct: */
 367 #define I2C_CLIENT_PEC  0x04            /* Use Packet Error Checking */
 368 #define I2C_CLIENT_TEN  0x10            /* we have a ten bit chip address */
 369                                         /* Must equal I2C_M_TEN below */
 370 #define I2C_CLIENT_WAKE 0x80            /* for board_info; true iff can wake */
 371
 372 /* i2c adapter classes (bitmask) */
 373 #define I2C_CLASS_HWMON         (1<<0)  /* lm_sensors, ... */
 374 #define I2C_CLASS_TV_ANALOG     (1<<1)  /* bttv + friends */
 375 #define I2C_CLASS_TV_DIGITAL    (1<<2)  /* dvb cards */
 376 #define I2C_CLASS_DDC           (1<<3)  /* DDC bus on graphics adapters */
 377 #define I2C_CLASS_SPD           (1<<7)  /* SPD EEPROMs and similar */
 378
 379 /* i2c_client_address_data is the struct for holding default client
 380  * addresses for a driver and for the parameters supplied on the
 381  * command line
 382  */
 383 struct i2c_client_address_data {
 384         const unsigned short *normal_i2c;
 385         const unsigned short *probe;
 386         const unsigned short *ignore;
 387         const unsigned short * const *forces;
 388 };
 389
 390 /* Internal numbers to terminate lists */
 391 #define I2C_CLIENT_END          0xfffeU
 392
 393 /* The numbers to use to set I2C bus address */
 394 #define ANY_I2C_BUS             0xffff
 395
 396 /* Construct an I2C_CLIENT_END-terminated array of i2c addresses */
 397 #define I2C_ADDRS(addr, addrs...) \
 398         ((const unsigned short []){ addr, ## addrs, I2C_CLIENT_END })
 399
 400
 401 /* ----- functions exported by i2c.o */
 402
 403 /* administration...
 404  */
 405 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 406 extern int i2c_add_adapter(struct i2c_adapter *);
 407 extern int i2c_del_adapter(struct i2c_adapter *);
 408 extern int i2c_add_numbered_adapter(struct i2c_adapter *);
 409
 410 extern int i2c_register_driver(struct module *, struct i2c_driver *);
 411 extern void i2c_del_driver(struct i2c_driver *);
 412
 413 static inline int i2c_add_driver(struct i2c_driver *driver)
 414 {
 415         return i2c_register_driver(THIS_MODULE, driver);
 416 }
 417
 418 extern struct i2c_client *i2c_use_client(struct i2c_client *client);
 419 extern void i2c_release_client(struct i2c_client *client);
 420
 421 /* call the i2c_client->command() of all attached clients with
 422  * the given arguments */
 423 extern void i2c_clients_command(struct i2c_adapter *adap,
 424                                 unsigned int cmd, void *arg);
 425
 426 extern struct i2c_adapter *i2c_get_adapter(int id);
 427 extern void i2c_put_adapter(struct i2c_adapter *adap);
 428
 429
 430 /* Return the functionality mask */
 431 static inline u32 i2c_get_functionality(struct i2c_adapter *adap)
 432 {
 433         return adap->algo->functionality(adap);
 434 }
 435
 436 /* Return 1 if adapter supports everything we need, 0 if not. */
 437 static inline int i2c_check_functionality(struct i2c_adapter *adap, u32 func)
 438 {
 439         return (func & i2c_get_functionality(adap)) == func;
 440 }
 441
 442 /* Return the adapter number for a specific adapter */
 443 static inline int i2c_adapter_id(struct i2c_adapter *adap)
 444 {
 445         return adap->nr;
 446 }
 447 #endif /* I2C */
 448 #endif /* __KERNEL__ */
 449
 450 /**
 451  * struct i2c_msg - an I2C transaction segment beginning with START
 452  * @addr: Slave address, either seven or ten bits.  When this is a ten
 453  *      bit address, I2C_M_TEN must be set in @flags and the adapter
 454  *      must support I2C_FUNC_10BIT_ADDR.
 455  * @flags: I2C_M_RD is handled by all adapters.  No other flags may be
 456  *      provided unless the adapter exported the relevant I2C_FUNC_*
 457  *      flags through i2c_check_functionality().
 458  * @len: Number of data bytes in @buf being read from or written to the
 459  *      I2C slave address.  For read transactions where I2C_M_RECV_LEN
 460  *      is set, the caller guarantees that this buffer can hold up to
 461  *      32 bytes in addition to the initial length byte sent by the
 462  *      slave (plus, if used, the SMBus PEC); and this value will be
 463  *      incremented by the number of block data bytes received.
 464  * @buf: The buffer into which data is read, or from which it's written.
 465  *
 466  * An i2c_msg is the low level representation of one segment of an I2C
 467  * transaction.  It is visible to drivers in the @i2c_transfer() procedure,
 468  * to userspace from i2c-dev, and to I2C adapter drivers through the
 469  * @i2c_adapter.@master_xfer() method.
 470  *
 471  * Except when I2C "protocol mangling" is used, all I2C adapters implement
 472  * the standard rules for I2C transactions.  Each transaction begins with a
 473  * START.  That is followed by the slave address, and a bit encoding read
 474  * versus write.  Then follow all the data bytes, possibly including a byte
 475  * with SMBus PEC.  The transfer terminates with a NAK, or when all those
 476  * bytes have been transferred and ACKed.  If this is the last message in a
 477  * group, it is followed by a STOP.  Otherwise it is followed by the next
 478  * @i2c_msg transaction segment, beginning with a (repeated) START.
 479  *
 480  * Alternatively, when the adapter supports I2C_FUNC_PROTOCOL_MANGLING then
 481  * passing certain @flags may have changed those standard protocol behaviors.
 482  * Those flags are only for use with broken/nonconforming slaves, and with
 483  * adapters which are known to support the specific mangling options they
 484  * need (one or more of IGNORE_NAK, NO_RD_ACK, NOSTART, and REV_DIR_ADDR).
 485  */
 486 struct i2c_msg {
 487         __u16 addr;     /* slave address                        */
 488         __u16 flags;
 489 #define I2C_M_TEN               0x0010  /* this is a ten bit chip address */
 490 #define I2C_M_RD                0x0001  /* read data, from slave to master */
 491 #define I2C_M_NOSTART           0x4000  /* if I2C_FUNC_PROTOCOL_MANGLING */
 492 #define I2C_M_REV_DIR_ADDR      0x2000  /* if I2C_FUNC_PROTOCOL_MANGLING */
 493 #define I2C_M_IGNORE_NAK        0x1000  /* if I2C_FUNC_PROTOCOL_MANGLING */
 494 #define I2C_M_NO_RD_ACK         0x0800  /* if I2C_FUNC_PROTOCOL_MANGLING */
 495 #define I2C_M_RECV_LEN          0x0400  /* length will be first received byte */
 496         __u16 len;              /* msg length                           */
 497         __u8 *buf;              /* pointer to msg data                  */
 498 };
 499
 500 /* To determine what functionality is present */
 501
 502 #define I2C_FUNC_I2C                    0x00000001
 503 #define I2C_FUNC_10BIT_ADDR             0x00000002
 504 #define I2C_FUNC_PROTOCOL_MANGLING      0x00000004 /* I2C_M_NOSTART etc. */
 505 #define I2C_FUNC_SMBUS_PEC              0x00000008
 506 #define I2C_FUNC_SMBUS_BLOCK_PROC_CALL  0x00008000 /* SMBus 2.0 */
 507 #define I2C_FUNC_SMBUS_QUICK            0x00010000
 508 #define I2C_FUNC_SMBUS_READ_BYTE        0x00020000
 509 #define I2C_FUNC_SMBUS_WRITE_BYTE       0x00040000
 510 #define I2C_FUNC_SMBUS_READ_BYTE_DATA   0x00080000
 511 #define I2C_FUNC_SMBUS_WRITE_BYTE_DATA  0x00100000
 512 #define I2C_FUNC_SMBUS_READ_WORD_DATA   0x00200000
 513 #define I2C_FUNC_SMBUS_WRITE_WORD_DATA  0x00400000
 514 #define I2C_FUNC_SMBUS_PROC_CALL        0x00800000
 515 #define I2C_FUNC_SMBUS_READ_BLOCK_DATA  0x01000000
 516 #define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA 0x02000000
 517 #define I2C_FUNC_SMBUS_READ_I2C_BLOCK   0x04000000 /* I2C-like block xfer  */
 518 #define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK  0x08000000 /* w/ 1-byte reg. addr. */
 519
 520 #define I2C_FUNC_SMBUS_BYTE             (I2C_FUNC_SMBUS_READ_BYTE | \
 521                                          I2C_FUNC_SMBUS_WRITE_BYTE)
 522 #define I2C_FUNC_SMBUS_BYTE_DATA        (I2C_FUNC_SMBUS_READ_BYTE_DATA | \
 523                                          I2C_FUNC_SMBUS_WRITE_BYTE_DATA)
 524 #define I2C_FUNC_SMBUS_WORD_DATA        (I2C_FUNC_SMBUS_READ_WORD_DATA | \
 525                                          I2C_FUNC_SMBUS_WRITE_WORD_DATA)
 526 #define I2C_FUNC_SMBUS_BLOCK_DATA       (I2C_FUNC_SMBUS_READ_BLOCK_DATA | \
 527                                          I2C_FUNC_SMBUS_WRITE_BLOCK_DATA)
 528 #define I2C_FUNC_SMBUS_I2C_BLOCK        (I2C_FUNC_SMBUS_READ_I2C_BLOCK | \
 529                                          I2C_FUNC_SMBUS_WRITE_I2C_BLOCK)
 530
 531 #define I2C_FUNC_SMBUS_EMUL             (I2C_FUNC_SMBUS_QUICK | \
 532                                          I2C_FUNC_SMBUS_BYTE | \
 533                                          I2C_FUNC_SMBUS_BYTE_DATA | \
 534                                          I2C_FUNC_SMBUS_WORD_DATA | \
 535                                          I2C_FUNC_SMBUS_PROC_CALL | \
 536                                          I2C_FUNC_SMBUS_WRITE_BLOCK_DATA | \
 537                                          I2C_FUNC_SMBUS_I2C_BLOCK | \
 538                                          I2C_FUNC_SMBUS_PEC)
 539
 540 /*
 541  * Data for SMBus Messages
 542  */
 543 #define I2C_SMBUS_BLOCK_MAX     32      /* As specified in SMBus standard */
 544 union i2c_smbus_data {
 545         __u8 byte;
 546         __u16 word;
 547         __u8 block[I2C_SMBUS_BLOCK_MAX + 2]; /* block[0] is used for length */
 548                                /* and one more for user-space compatibility */
 549 };
 550
 551 /* i2c_smbus_xfer read or write markers */
 552 #define I2C_SMBUS_READ  1
 553 #define I2C_SMBUS_WRITE 0
 554
 555 /* SMBus transaction types (size parameter in the above functions)
 556    Note: these no longer correspond to the (arbitrary) PIIX4 internal codes! */
 557 #define I2C_SMBUS_QUICK             0
 558 #define I2C_SMBUS_BYTE              1
 559 #define I2C_SMBUS_BYTE_DATA         2
 560 #define I2C_SMBUS_WORD_DATA         3
 561 #define I2C_SMBUS_PROC_CALL         4
 562 #define I2C_SMBUS_BLOCK_DATA        5
 563 #define I2C_SMBUS_I2C_BLOCK_BROKEN  6
 564 #define I2C_SMBUS_BLOCK_PROC_CALL   7           /* SMBus 2.0 */
 565 #define I2C_SMBUS_I2C_BLOCK_DATA    8
 566
 567
 568 #ifdef __KERNEL__
 569
 570 /* These defines are used for probing i2c client addresses */
 571 /* The length of the option lists */
 572 #define I2C_CLIENT_MAX_OPTS 48
 573
 574 /* Default fill of many variables */
 575 #define I2C_CLIENT_DEFAULTS {I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
 576                              I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
 577                              I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
 578                              I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
 579                              I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
 580                              I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
 581                              I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
 582                              I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
 583                              I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
 584                              I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
 585                              I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
 586                              I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
 587                              I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
 588                              I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
 589                              I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
 590                              I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END}
 591
 592 /* I2C_CLIENT_MODULE_PARM creates a module parameter, and puts it in the
 593    module header */
 594
 595 #define I2C_CLIENT_MODULE_PARM(var,desc) \
 596   static unsigned short var[I2C_CLIENT_MAX_OPTS] = I2C_CLIENT_DEFAULTS; \
 597   static unsigned int var##_num; \
 598   module_param_array(var, short, &var##_num, 0); \
 599   MODULE_PARM_DESC(var, desc)
 600
 601 #define I2C_CLIENT_MODULE_PARM_FORCE(name)                              \
 602 I2C_CLIENT_MODULE_PARM(force_##name,                                    \
 603                        "List of adapter,address pairs which are "       \
 604                        "unquestionably assumed to contain a `"          \
 605                        # name "' chip")
 606
 607
 608 #define I2C_CLIENT_INSMOD_COMMON                                        \
 609 I2C_CLIENT_MODULE_PARM(probe, "List of adapter,address pairs to scan "  \
 610                        "additionally");                                 \
 611 I2C_CLIENT_MODULE_PARM(ignore, "List of adapter,address pairs not to "  \
 612                        "scan");                                         \
 613 static const struct i2c_client_address_data addr_data = {               \
 614         .normal_i2c     = normal_i2c,                                   \
 615         .probe          = probe,                                        \
 616         .ignore         = ignore,                                       \
 617         .forces         = forces,                                       \
 618 }
 619
 620 #define I2C_CLIENT_FORCE_TEXT \
 621         "List of adapter,address pairs to boldly assume to be present"
 622
 623 /* These are the ones you want to use in your own drivers. Pick the one
 624    which matches the number of devices the driver differenciates between. */
 625 #define I2C_CLIENT_INSMOD                                               \
 626 I2C_CLIENT_MODULE_PARM(force, I2C_CLIENT_FORCE_TEXT);                   \
 627 static const unsigned short * const forces[] = { force, NULL };         \
 628 I2C_CLIENT_INSMOD_COMMON
 629
 630 #define I2C_CLIENT_INSMOD_1(chip1)                                      \
 631 enum chips { any_chip, chip1 };                                         \
 632 I2C_CLIENT_MODULE_PARM(force, I2C_CLIENT_FORCE_TEXT);                   \
 633 I2C_CLIENT_MODULE_PARM_FORCE(chip1);                                    \
 634 static const unsigned short * const forces[] =  { force,                \
 635         force_##chip1, NULL };                                          \
 636 I2C_CLIENT_INSMOD_COMMON
 637
 638 #define I2C_CLIENT_INSMOD_2(chip1, chip2)                               \
 639 enum chips { any_chip, chip1, chip2 };                                  \
 640 I2C_CLIENT_MODULE_PARM(force, I2C_CLIENT_FORCE_TEXT);                   \
 641 I2C_CLIENT_MODULE_PARM_FORCE(chip1);                                    \
 642 I2C_CLIENT_MODULE_PARM_FORCE(chip2);                                    \
 643 static const unsigned short * const forces[] =  { force,                \
 644         force_##chip1, force_##chip2, NULL };                           \
 645 I2C_CLIENT_INSMOD_COMMON
 646
 647 #define I2C_CLIENT_INSMOD_3(chip1, chip2, chip3)                        \
 648 enum chips { any_chip, chip1, chip2, chip3 };                           \
 649 I2C_CLIENT_MODULE_PARM(force, I2C_CLIENT_FORCE_TEXT);                   \
 650 I2C_CLIENT_MODULE_PARM_FORCE(chip1);                                    \
 651 I2C_CLIENT_MODULE_PARM_FORCE(chip2);                                    \
 652 I2C_CLIENT_MODULE_PARM_FORCE(chip3);                                    \
 653 static const unsigned short * const forces[] =  { force,                \
 654         force_##chip1, force_##chip2, force_##chip3, NULL };            \
 655 I2C_CLIENT_INSMOD_COMMON
 656
 657 #define I2C_CLIENT_INSMOD_4(chip1, chip2, chip3, chip4)                 \
 658 enum chips { any_chip, chip1, chip2, chip3, chip4 };                    \
 659 I2C_CLIENT_MODULE_PARM(force, I2C_CLIENT_FORCE_TEXT);                   \
 660 I2C_CLIENT_MODULE_PARM_FORCE(chip1);                                    \
 661 I2C_CLIENT_MODULE_PARM_FORCE(chip2);                                    \
 662 I2C_CLIENT_MODULE_PARM_FORCE(chip3);                                    \
 663 I2C_CLIENT_MODULE_PARM_FORCE(chip4);                                    \
 664 static const unsigned short * const forces[] =  { force,                \
 665         force_##chip1, force_##chip2, force_##chip3,                    \
 666         force_##chip4, NULL};                                           \
 667 I2C_CLIENT_INSMOD_COMMON
 668
 669 #define I2C_CLIENT_INSMOD_5(chip1, chip2, chip3, chip4, chip5)          \
 670 enum chips { any_chip, chip1, chip2, chip3, chip4, chip5 };             \
 671 I2C_CLIENT_MODULE_PARM(force, I2C_CLIENT_FORCE_TEXT);                   \
 672 I2C_CLIENT_MODULE_PARM_FORCE(chip1);                                    \
 673 I2C_CLIENT_MODULE_PARM_FORCE(chip2);                                    \
 674 I2C_CLIENT_MODULE_PARM_FORCE(chip3);                                    \
 675 I2C_CLIENT_MODULE_PARM_FORCE(chip4);                                    \
 676 I2C_CLIENT_MODULE_PARM_FORCE(chip5);                                    \
 677 static const unsigned short * const forces[] = { force,                 \
 678         force_##chip1, force_##chip2, force_##chip3,                    \
 679         force_##chip4, force_##chip5, NULL };                           \
 680 I2C_CLIENT_INSMOD_COMMON
 681
 682 #define I2C_CLIENT_INSMOD_6(chip1, chip2, chip3, chip4, chip5, chip6)   \
 683 enum chips { any_chip, chip1, chip2, chip3, chip4, chip5, chip6 };      \
 684 I2C_CLIENT_MODULE_PARM(force, I2C_CLIENT_FORCE_TEXT);                   \
 685 I2C_CLIENT_MODULE_PARM_FORCE(chip1);                                    \
 686 I2C_CLIENT_MODULE_PARM_FORCE(chip2);                                    \
 687 I2C_CLIENT_MODULE_PARM_FORCE(chip3);                                    \
 688 I2C_CLIENT_MODULE_PARM_FORCE(chip4);                                    \
 689 I2C_CLIENT_MODULE_PARM_FORCE(chip5);                                    \
 690 I2C_CLIENT_MODULE_PARM_FORCE(chip6);                                    \
 691 static const unsigned short * const forces[] = { force,                 \
 692         force_##chip1, force_##chip2, force_##chip3,                    \
 693         force_##chip4, force_##chip5, force_##chip6, NULL };            \
 694 I2C_CLIENT_INSMOD_COMMON
 695
 696 #define I2C_CLIENT_INSMOD_7(chip1, chip2, chip3, chip4, chip5, chip6, chip7) \
 697 enum chips { any_chip, chip1, chip2, chip3, chip4, chip5, chip6,        \
 698              chip7 };                                                   \
 699 I2C_CLIENT_MODULE_PARM(force, I2C_CLIENT_FORCE_TEXT);                   \
 700 I2C_CLIENT_MODULE_PARM_FORCE(chip1);                                    \
 701 I2C_CLIENT_MODULE_PARM_FORCE(chip2);                                    \
 702 I2C_CLIENT_MODULE_PARM_FORCE(chip3);                                    \
 703 I2C_CLIENT_MODULE_PARM_FORCE(chip4);                                    \
 704 I2C_CLIENT_MODULE_PARM_FORCE(chip5);                                    \
 705 I2C_CLIENT_MODULE_PARM_FORCE(chip6);                                    \
 706 I2C_CLIENT_MODULE_PARM_FORCE(chip7);                                    \
 707 static const unsigned short * const forces[] = { force,                 \
 708         force_##chip1, force_##chip2, force_##chip3,                    \
 709         force_##chip4, force_##chip5, force_##chip6,                    \
 710         force_##chip7, NULL };                                          \
 711 I2C_CLIENT_INSMOD_COMMON
 712
 713 #define I2C_CLIENT_INSMOD_8(chip1, chip2, chip3, chip4, chip5, chip6, chip7, chip8) \
 714 enum chips { any_chip, chip1, chip2, chip3, chip4, chip5, chip6,        \
 715              chip7, chip8 };                                            \
 716 I2C_CLIENT_MODULE_PARM(force, I2C_CLIENT_FORCE_TEXT);                   \
 717 I2C_CLIENT_MODULE_PARM_FORCE(chip1);                                    \
 718 I2C_CLIENT_MODULE_PARM_FORCE(chip2);                                    \
 719 I2C_CLIENT_MODULE_PARM_FORCE(chip3);                                    \
 720 I2C_CLIENT_MODULE_PARM_FORCE(chip4);                                    \
 721 I2C_CLIENT_MODULE_PARM_FORCE(chip5);                                    \
 722 I2C_CLIENT_MODULE_PARM_FORCE(chip6);                                    \
 723 I2C_CLIENT_MODULE_PARM_FORCE(chip7);                                    \
 724 I2C_CLIENT_MODULE_PARM_FORCE(chip8);                                    \
 725 static const unsigned short * const forces[] = { force,                 \
 726         force_##chip1, force_##chip2, force_##chip3,                    \
 727         force_##chip4, force_##chip5, force_##chip6,                    \
 728         force_##chip7, force_##chip8, NULL };                           \
 729 I2C_CLIENT_INSMOD_COMMON
 730 #endif /* __KERNEL__ */
 731 #endif /* _LINUX_I2C_H */