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 /*
  51  * The master routines are the ones normally used to transmit data to devices
  52  * on a bus (or read from them). Apart from two basic transfer functions to
  53  * transmit one message at a time, a more complex version can be used to
  54  * transmit an arbitrary number of messages without interruption.
  55  */
  56 extern int i2c_master_send(struct i2c_client *client, const char *buf,
  57                            int count);
  58 extern int i2c_master_recv(struct i2c_client *client, char *buf, int count);
  59
  60 /* Transfer num messages.
  61  */
  62 extern int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
  63                         int num);
  64
  65 /* This is the very generalized SMBus access routine. You probably do not
  66    want to use this, though; one of the functions below may be much easier,
  67    and probably just as fast.
  68    Note that we use i2c_adapter here, because you do not need a specific
  69    smbus adapter to call this function. */
  70 extern s32 i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr,
  71                           unsigned short flags, char read_write, u8 command,
  72                           int size, union i2c_smbus_data *data);
  73
  74 /* Now follow the 'nice' access routines. These also document the calling
  75    conventions of i2c_smbus_xfer. */
  76
  77 extern s32 i2c_smbus_read_byte(struct i2c_client *client);
  78 extern s32 i2c_smbus_write_byte(struct i2c_client *client, u8 value);
  79 extern s32 i2c_smbus_read_byte_data(struct i2c_client *client, u8 command);
  80 extern s32 i2c_smbus_write_byte_data(struct i2c_client *client,
  81                                      u8 command, u8 value);
  82 extern s32 i2c_smbus_read_word_data(struct i2c_client *client, u8 command);
  83 extern s32 i2c_smbus_write_word_data(struct i2c_client *client,
  84                                      u8 command, u16 value);
  85 /* Returns the number of read bytes */
  86 extern s32 i2c_smbus_read_block_data(struct i2c_client *client,
  87                                      u8 command, u8 *values);
  88 extern s32 i2c_smbus_write_block_data(struct i2c_client *client,
  89                                       u8 command, u8 length, const u8 *values);
  90 /* Returns the number of read bytes */
  91 extern s32 i2c_smbus_read_i2c_block_data(struct i2c_client *client,
  92                                          u8 command, u8 length, u8 *values);
  93 extern s32 i2c_smbus_write_i2c_block_data(struct i2c_client *client,
  94                                           u8 command, u8 length,
  95                                           const u8 *values);
  96
  97 /**
  98  * struct i2c_driver - represent an I2C device driver
  99  * @id: Unique driver ID (optional)
 100  * @class: What kind of i2c device we instantiate (for detect)
 101  * @attach_adapter: Callback for bus addition (for legacy drivers)
 102  * @detach_adapter: Callback for bus removal (for legacy drivers)
 103  * @detach_client: Callback for device removal (for legacy drivers)
 104  * @probe: Callback for device binding (new-style drivers)
 105  * @remove: Callback for device unbinding (new-style drivers)
 106  * @shutdown: Callback for device shutdown
 107  * @suspend: Callback for device suspend
 108  * @resume: Callback for device resume
 109  * @command: Callback for bus-wide signaling (optional)
 110  * @driver: Device driver model driver
 111  * @id_table: List of I2C devices supported by this driver
 112  * @detect: Callback for device detection
 113  * @address_data: The I2C addresses to probe, ignore or force (for detect)
 114  * @clients: List of detected clients we created (for i2c-core use only)
 115  *
 116  * The driver.owner field should be set to the module owner of this driver.
 117  * The driver.name field should be set to the name of this driver.
 118  *
 119  * For automatic device detection, both @detect and @address_data must
 120  * be defined. @class should also be set, otherwise only devices forced
 121  * with module parameters will be created. The detect function must
 122  * fill at least the name field of the i2c_board_info structure it is
 123  * handed upon successful detection, and possibly also the flags field.
 124  *
 125  * If @detect is missing, the driver will still work fine for enumerated
 126  * devices. Detected devices simply won't be supported. This is expected
 127  * for the many I2C/SMBus devices which can't be detected reliably, and
 128  * the ones which can always be enumerated in practice.
 129  *
 130  * The i2c_client structure which is handed to the @detect callback is
 131  * not a real i2c_client. It is initialized just enough so that you can
 132  * call i2c_smbus_read_byte_data and friends on it. Don't do anything
 133  * else with it. In particular, calling dev_dbg and friends on it is
 134  * not allowed.
 135  */
 136 struct i2c_driver {
 137         int id;
 138         unsigned int class;
 139
 140         /* Notifies the driver that a new bus has appeared. This routine
 141          * can be used by the driver to test if the bus meets its conditions
 142          * & seek for the presence of the chip(s) it supports. If found, it
 143          * registers the client(s) that are on the bus to the i2c admin. via
 144          * i2c_attach_client.  (LEGACY I2C DRIVERS ONLY)
 145          */
 146         int (*attach_adapter)(struct i2c_adapter *);
 147         int (*detach_adapter)(struct i2c_adapter *);
 148
 149         /* tells the driver that a client is about to be deleted & gives it
 150          * the chance to remove its private data. Also, if the client struct
 151          * has been dynamically allocated by the driver in the function above,
 152          * it must be freed here.  (LEGACY I2C DRIVERS ONLY)
 153          */
 154         int (*detach_client)(struct i2c_client *);
 155
 156         /* Standard driver model interfaces, for "new style" i2c drivers.
 157          * With the driver model, device enumeration is NEVER done by drivers;
 158          * it's done by infrastructure.  (NEW STYLE DRIVERS ONLY)
 159          */
 160         int (*probe)(struct i2c_client *, const struct i2c_device_id *);
 161         int (*remove)(struct i2c_client *);
 162
 163         /* driver model interfaces that don't relate to enumeration  */
 164         void (*shutdown)(struct i2c_client *);
 165         int (*suspend)(struct i2c_client *, pm_message_t mesg);
 166         int (*resume)(struct i2c_client *);
 167
 168         /* a ioctl like command that can be used to perform specific functions
 169          * with the device.
 170          */
 171         int (*command)(struct i2c_client *client, unsigned int cmd, void *arg);
 172
 173         struct device_driver driver;
 174         const struct i2c_device_id *id_table;
 175
 176         /* Device detection callback for automatic device creation */
 177         int (*detect)(struct i2c_client *, int kind, struct i2c_board_info *);
 178         const struct i2c_client_address_data *address_data;
 179         struct list_head clients;
 180 };
 181 #define to_i2c_driver(d) container_of(d, struct i2c_driver, driver)
 182
 183 /**
 184  * struct i2c_client - represent an I2C slave device
 185  * @flags: I2C_CLIENT_TEN indicates the device uses a ten bit chip address;
 186  *      I2C_CLIENT_PEC indicates it uses SMBus Packet Error Checking
 187  * @addr: Address used on the I2C bus connected to the parent adapter.
 188  * @name: Indicates the type of the device, usually a chip name that's
 189  *      generic enough to hide second-sourcing and compatible revisions.
 190  * @adapter: manages the bus segment hosting this I2C device
 191  * @driver: device's driver, hence pointer to access routines
 192  * @dev: Driver model device node for the slave.
 193  * @irq: indicates the IRQ generated by this device (if any)
 194  * @list: list of active/busy clients (DEPRECATED)
 195  * @detected: member of an i2c_driver.clients list
 196  * @released: used to synchronize client releases & detaches and references
 197  *
 198  * An i2c_client identifies a single device (i.e. chip) connected to an
 199  * i2c bus. The behaviour exposed to Linux is defined by the driver
 200  * managing the device.
 201  */
 202 struct i2c_client {
 203         unsigned short flags;           /* div., see below              */
 204         unsigned short addr;            /* chip address - NOTE: 7bit    */
 205                                         /* addresses are stored in the  */
 206                                         /* _LOWER_ 7 bits               */
 207         char name[I2C_NAME_SIZE];
 208         struct i2c_adapter *adapter;    /* the adapter we sit on        */
 209         struct i2c_driver *driver;      /* and our access routines      */
 210         struct device dev;              /* the device structure         */
 211         int irq;                        /* irq issued by device         */
 212         struct list_head list;          /* DEPRECATED */
 213         struct list_head detected;
 214         struct completion released;
 215 };
 216 #define to_i2c_client(d) container_of(d, struct i2c_client, dev)
 217
 218 extern struct i2c_client *i2c_verify_client(struct device *dev);
 219
 220 static inline struct i2c_client *kobj_to_i2c_client(struct kobject *kobj)
 221 {
 222         struct device * const dev = container_of(kobj, struct device, kobj);
 223         return to_i2c_client(dev);
 224 }
 225
 226 static inline void *i2c_get_clientdata(const struct i2c_client *dev)
 227 {
 228         return dev_get_drvdata(&dev->dev);
 229 }
 230
 231 static inline void i2c_set_clientdata(struct i2c_client *dev, void *data)
 232 {
 233         dev_set_drvdata(&dev->dev, data);
 234 }
 235
 236 /**
 237  * struct i2c_board_info - template for device creation
 238  * @type: chip type, to initialize i2c_client.name
 239  * @flags: to initialize i2c_client.flags
 240  * @addr: stored in i2c_client.addr
 241  * @platform_data: stored in i2c_client.dev.platform_data
 242  * @archdata: copied into i2c_client.dev.archdata
 243  * @irq: stored in i2c_client.irq
 244  *
 245  * I2C doesn't actually support hardware probing, although controllers and
 246  * devices may be able to use I2C_SMBUS_QUICK to tell whether or not there's
 247  * a device at a given address.  Drivers commonly need more information than
 248  * that, such as chip type, configuration, associated IRQ, and so on.
 249  *
 250  * i2c_board_info is used to build tables of information listing I2C devices
 251  * that are present.  This information is used to grow the driver model tree
 252  * for "new style" I2C drivers.  For mainboards this is done statically using
 253  * i2c_register_board_info(); bus numbers identify adapters that aren't
 254  * yet available.  For add-on boards, i2c_new_device() does this dynamically
 255  * with the adapter already known.
 256  */
 257 struct i2c_board_info {
 258         char            type[I2C_NAME_SIZE];
 259         unsigned short  flags;
 260         unsigned short  addr;
 261         void            *platform_data;
 262         struct dev_archdata     *archdata;
 263         int             irq;
 264 };
 265
 266 /**
 267  * I2C_BOARD_INFO - macro used to list an i2c device and its address
 268  * @dev_type: identifies the device type
 269  * @dev_addr: the device's address on the bus.
 270  *
 271  * This macro initializes essential fields of a struct i2c_board_info,
 272  * declaring what has been provided on a particular board.  Optional
 273  * fields (such as associated irq, or device-specific platform_data)
 274  * are provided using conventional syntax.
 275  */
 276 #define I2C_BOARD_INFO(dev_type, dev_addr) \
 277         .type = (dev_type), .addr = (dev_addr)
 278
 279
 280 /* Add-on boards should register/unregister their devices; e.g. a board
 281  * with integrated I2C, a config eeprom, sensors, and a codec that's
 282  * used in conjunction with the primary hardware.
 283  */
 284 extern struct i2c_client *
 285 i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info);
 286
 287 /* If you don't know the exact address of an I2C device, use this variant
 288  * instead, which can probe for device presence in a list of possible
 289  * addresses.
 290  */
 291 extern struct i2c_client *
 292 i2c_new_probed_device(struct i2c_adapter *adap,
 293                       struct i2c_board_info *info,
 294                       unsigned short const *addr_list);
 295
 296 /* For devices that use several addresses, use i2c_new_dummy() to make
 297  * client handles for the extra addresses.
 298  */
 299 extern struct i2c_client *
 300 i2c_new_dummy(struct i2c_adapter *adap, u16 address);
 301
 302 extern void i2c_unregister_device(struct i2c_client *);
 303
 304 /* Mainboard arch_initcall() code should register all its I2C devices.
 305  * This is done at arch_initcall time, before declaring any i2c adapters.
 306  * Modules for add-on boards must use other calls.
 307  */
 308 #ifdef CONFIG_I2C_BOARDINFO
 309 extern int
 310 i2c_register_board_info(int busnum, struct i2c_board_info const *info,
 311                         unsigned n);
 312 #else
 313 static inline int
 314 i2c_register_board_info(int busnum, struct i2c_board_info const *info,
 315                         unsigned n)
 316 {
 317         return 0;
 318 }
 319 #endif
 320
 321 /*
 322  * The following structs are for those who like to implement new bus drivers:
 323  * i2c_algorithm is the interface to a class of hardware solutions which can
 324  * be addressed using the same bus algorithms - i.e. bit-banging or the PCF8584
 325  * to name two of the most common.
 326  */
 327 struct i2c_algorithm {
 328         /* If an adapter algorithm can't do I2C-level access, set master_xfer
 329            to NULL. If an adapter algorithm can do SMBus access, set
 330            smbus_xfer. If set to NULL, the SMBus protocol is simulated
 331            using common I2C messages */
 332         /* master_xfer should return the number of messages successfully
 333            processed, or a negative value on error */
 334         int (*master_xfer)(struct i2c_adapter *adap, struct i2c_msg *msgs,
 335                            int num);
 336         int (*smbus_xfer) (struct i2c_adapter *adap, u16 addr,
 337                            unsigned short flags, char read_write,
 338                            u8 command, int size, union i2c_smbus_data *data);
 339
 340         /* To determine what the adapter supports */
 341         u32 (*functionality) (struct i2c_adapter *);
 342 };
 343
 344 /*
 345  * i2c_adapter is the structure used to identify a physical i2c bus along
 346  * with the access algorithms necessary to access it.
 347  */
 348 struct i2c_adapter {
 349         struct module *owner;
 350         unsigned int id;
 351         unsigned int class;               /* classes to allow probing for */
 352         const struct i2c_algorithm *algo; /* the algorithm to access the bus */
 353         void *algo_data;
 354
 355         /* --- administration stuff. */
 356         int (*client_register)(struct i2c_client *);
 357         int (*client_unregister)(struct i2c_client *);
 358
 359         /* data fields that are valid for all devices   */
 360         u8 level;                       /* nesting level for lockdep */
 361         struct mutex bus_lock;
 362         struct mutex clist_lock;
 363
 364         int timeout;
 365         int retries;
 366         struct device dev;              /* the adapter device */
 367
 368         int nr;
 369         struct list_head clients;       /* DEPRECATED */
 370         char name[48];
 371         struct completion dev_released;
 372 };
 373 #define to_i2c_adapter(d) container_of(d, struct i2c_adapter, dev)
 374
 375 static inline void *i2c_get_adapdata(const struct i2c_adapter *dev)
 376 {
 377         return dev_get_drvdata(&dev->dev);
 378 }
 379
 380 static inline void i2c_set_adapdata(struct i2c_adapter *dev, void *data)
 381 {
 382         dev_set_drvdata(&dev->dev, data);
 383 }
 384
 385 /*flags for the client struct: */
 386 #define I2C_CLIENT_PEC  0x04            /* Use Packet Error Checking */
 387 #define I2C_CLIENT_TEN  0x10            /* we have a ten bit chip address */
 388                                         /* Must equal I2C_M_TEN below */
 389 #define I2C_CLIENT_WAKE 0x80            /* for board_info; true iff can wake */
 390
 391 /* i2c adapter classes (bitmask) */
 392 #define I2C_CLASS_HWMON         (1<<0)  /* lm_sensors, ... */
 393 #define I2C_CLASS_TV_ANALOG     (1<<1)  /* bttv + friends */
 394 #define I2C_CLASS_TV_DIGITAL    (1<<2)  /* dvb cards */
 395 #define I2C_CLASS_DDC           (1<<3)  /* DDC bus on graphics adapters */
 396 #define I2C_CLASS_CAM_ANALOG    (1<<4)  /* camera with analog CCD */
 397 #define I2C_CLASS_CAM_DIGITAL   (1<<5)  /* most webcams */
 398 #define I2C_CLASS_SOUND         (1<<6)  /* sound devices */
 399 #define I2C_CLASS_SPD           (1<<7)  /* SPD EEPROMs and similar */
 400 #define I2C_CLASS_ALL           (UINT_MAX) /* all of the above */
 401
 402 /* i2c_client_address_data is the struct for holding default client
 403  * addresses for a driver and for the parameters supplied on the
 404  * command line
 405  */
 406 struct i2c_client_address_data {
 407         const unsigned short *normal_i2c;
 408         const unsigned short *probe;
 409         const unsigned short *ignore;
 410         const unsigned short * const *forces;
 411 };
 412
 413 /* Internal numbers to terminate lists */
 414 #define I2C_CLIENT_END          0xfffeU
 415
 416 /* The numbers to use to set I2C bus address */
 417 #define ANY_I2C_BUS             0xffff
 418
 419
 420 /* ----- functions exported by i2c.o */
 421
 422 /* administration...
 423  */
 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 int i2c_attach_client(struct i2c_client *);
 437 extern int i2c_detach_client(struct i2c_client *);
 438
 439 extern struct i2c_client *i2c_use_client(struct i2c_client *client);
 440 extern void i2c_release_client(struct i2c_client *client);
 441
 442 /* call the i2c_client->command() of all attached clients with
 443  * the given arguments */
 444 extern void i2c_clients_command(struct i2c_adapter *adap,
 445                                 unsigned int cmd, void *arg);
 446
 447 /* Detect function. It iterates over all possible addresses itself.
 448  * It will only call found_proc if some client is connected at the
 449  * specific address (unless a 'force' matched);
 450  */
 451 extern int i2c_probe(struct i2c_adapter *adapter,
 452                 const struct i2c_client_address_data *address_data,
 453                 int (*found_proc) (struct i2c_adapter *, int, int));
 454
 455 extern struct i2c_adapter *i2c_get_adapter(int id);
 456 extern void i2c_put_adapter(struct i2c_adapter *adap);
 457
 458
 459 /* Return the functionality mask */
 460 static inline u32 i2c_get_functionality(struct i2c_adapter *adap)
 461 {
 462         return adap->algo->functionality(adap);
 463 }
 464
 465 /* Return 1 if adapter supports everything we need, 0 if not. */
 466 static inline int i2c_check_functionality(struct i2c_adapter *adap, u32 func)
 467 {
 468         return (func & i2c_get_functionality(adap)) == func;
 469 }
 470
 471 /* Return the adapter number for a specific adapter */
 472 static inline int i2c_adapter_id(struct i2c_adapter *adap)
 473 {
 474         return adap->nr;
 475 }
 476 #endif /* __KERNEL__ */
 477
 478 /**
 479  * struct i2c_msg - an I2C transaction segment beginning with START
 480  * @addr: Slave address, either seven or ten bits.  When this is a ten
 481  *      bit address, I2C_M_TEN must be set in @flags and the adapter
 482  *      must support I2C_FUNC_10BIT_ADDR.
 483  * @flags: I2C_M_RD is handled by all adapters.  No other flags may be
 484  *      provided unless the adapter exported the relevant I2C_FUNC_*
 485  *      flags through i2c_check_functionality().
 486  * @len: Number of data bytes in @buf being read from or written to the
 487  *      I2C slave address.  For read transactions where I2C_M_RECV_LEN
 488  *      is set, the caller guarantees that this buffer can hold up to
 489  *      32 bytes in addition to the initial length byte sent by the
 490  *      slave (plus, if used, the SMBus PEC); and this value will be
 491  *      incremented by the number of block data bytes received.
 492  * @buf: The buffer into which data is read, or from which it's written.
 493  *
 494  * An i2c_msg is the low level representation of one segment of an I2C
 495  * transaction.  It is visible to drivers in the @i2c_transfer() procedure,
 496  * to userspace from i2c-dev, and to I2C adapter drivers through the
 497  * @i2c_adapter.@master_xfer() method.
 498  *
 499  * Except when I2C "protocol mangling" is used, all I2C adapters implement
 500  * the standard rules for I2C transactions.  Each transaction begins with a
 501  * START.  That is followed by the slave address, and a bit encoding read
 502  * versus write.  Then follow all the data bytes, possibly including a byte
 503  * with SMBus PEC.  The transfer terminates with a NAK, or when all those
 504  * bytes have been transferred and ACKed.  If this is the last message in a
 505  * group, it is followed by a STOP.  Otherwise it is followed by the next
 506  * @i2c_msg transaction segment, beginning with a (repeated) START.
 507  *
 508  * Alternatively, when the adapter supports I2C_FUNC_PROTOCOL_MANGLING then
 509  * passing certain @flags may have changed those standard protocol behaviors.
 510  * Those flags are only for use with broken/nonconforming slaves, and with
 511  * adapters which are known to support the specific mangling options they
 512  * need (one or more of IGNORE_NAK, NO_RD_ACK, NOSTART, and REV_DIR_ADDR).
 513  */
 514 struct i2c_msg {
 515         __u16 addr;     /* slave address                        */
 516         __u16 flags;
 517 #define I2C_M_TEN               0x0010  /* this is a ten bit chip address */
 518 #define I2C_M_RD                0x0001  /* read data, from slave to master */
 519 #define I2C_M_NOSTART           0x4000  /* if I2C_FUNC_PROTOCOL_MANGLING */
 520 #define I2C_M_REV_DIR_ADDR      0x2000  /* if I2C_FUNC_PROTOCOL_MANGLING */
 521 #define I2C_M_IGNORE_NAK        0x1000  /* if I2C_FUNC_PROTOCOL_MANGLING */
 522 #define I2C_M_NO_RD_ACK         0x0800  /* if I2C_FUNC_PROTOCOL_MANGLING */
 523 #define I2C_M_RECV_LEN          0x0400  /* length will be first received byte */
 524         __u16 len;              /* msg length                           */
 525         __u8 *buf;              /* pointer to msg data                  */
 526 };
 527
 528 /* To determine what functionality is present */
 529
 530 #define I2C_FUNC_I2C                    0x00000001
 531 #define I2C_FUNC_10BIT_ADDR             0x00000002
 532 #define I2C_FUNC_PROTOCOL_MANGLING      0x00000004 /* I2C_M_NOSTART etc. */
 533 #define I2C_FUNC_SMBUS_PEC              0x00000008
 534 #define I2C_FUNC_SMBUS_BLOCK_PROC_CALL  0x00008000 /* SMBus 2.0 */
 535 #define I2C_FUNC_SMBUS_QUICK            0x00010000
 536 #define I2C_FUNC_SMBUS_READ_BYTE        0x00020000
 537 #define I2C_FUNC_SMBUS_WRITE_BYTE       0x00040000
 538 #define I2C_FUNC_SMBUS_READ_BYTE_DATA   0x00080000
 539 #define I2C_FUNC_SMBUS_WRITE_BYTE_DATA  0x00100000
 540 #define I2C_FUNC_SMBUS_READ_WORD_DATA   0x00200000
 541 #define I2C_FUNC_SMBUS_WRITE_WORD_DATA  0x00400000
 542 #define I2C_FUNC_SMBUS_PROC_CALL        0x00800000
 543 #define I2C_FUNC_SMBUS_READ_BLOCK_DATA  0x01000000
 544 #define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA 0x02000000
 545 #define I2C_FUNC_SMBUS_READ_I2C_BLOCK   0x04000000 /* I2C-like block xfer  */
 546 #define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK  0x08000000 /* w/ 1-byte reg. addr. */
 547
 548 #define I2C_FUNC_SMBUS_BYTE             (I2C_FUNC_SMBUS_READ_BYTE | \
 549                                          I2C_FUNC_SMBUS_WRITE_BYTE)
 550 #define I2C_FUNC_SMBUS_BYTE_DATA        (I2C_FUNC_SMBUS_READ_BYTE_DATA | \
 551                                          I2C_FUNC_SMBUS_WRITE_BYTE_DATA)
 552 #define I2C_FUNC_SMBUS_WORD_DATA        (I2C_FUNC_SMBUS_READ_WORD_DATA | \
 553                                          I2C_FUNC_SMBUS_WRITE_WORD_DATA)
 554 #define I2C_FUNC_SMBUS_BLOCK_DATA       (I2C_FUNC_SMBUS_READ_BLOCK_DATA | \
 555                                          I2C_FUNC_SMBUS_WRITE_BLOCK_DATA)
 556 #define I2C_FUNC_SMBUS_I2C_BLOCK        (I2C_FUNC_SMBUS_READ_I2C_BLOCK | \
 557                                          I2C_FUNC_SMBUS_WRITE_I2C_BLOCK)
 558
 559 #define I2C_FUNC_SMBUS_EMUL             (I2C_FUNC_SMBUS_QUICK | \
 560                                          I2C_FUNC_SMBUS_BYTE | \
 561                                          I2C_FUNC_SMBUS_BYTE_DATA | \
 562                                          I2C_FUNC_SMBUS_WORD_DATA | \
 563                                          I2C_FUNC_SMBUS_PROC_CALL | \
 564                                          I2C_FUNC_SMBUS_WRITE_BLOCK_DATA | \
 565                                          I2C_FUNC_SMBUS_I2C_BLOCK | \
 566                                          I2C_FUNC_SMBUS_PEC)
 567
 568 /*
 569  * Data for SMBus Messages
 570  */
 571 #define I2C_SMBUS_BLOCK_MAX     32      /* As specified in SMBus standard */
 572 union i2c_smbus_data {
 573         __u8 byte;
 574         __u16 word;
 575         __u8 block[I2C_SMBUS_BLOCK_MAX + 2]; /* block[0] is used for length */
 576                                /* and one more for user-space compatibility */
 577 };
 578
 579 /* i2c_smbus_xfer read or write markers */
 580 #define I2C_SMBUS_READ  1
 581 #define I2C_SMBUS_WRITE 0
 582
 583 /* SMBus transaction types (size parameter in the above functions)
 584    Note: these no longer correspond to the (arbitrary) PIIX4 internal codes! */
 585 #define I2C_SMBUS_QUICK             0
 586 #define I2C_SMBUS_BYTE              1
 587 #define I2C_SMBUS_BYTE_DATA         2
 588 #define I2C_SMBUS_WORD_DATA         3
 589 #define I2C_SMBUS_PROC_CALL         4
 590 #define I2C_SMBUS_BLOCK_DATA        5
 591 #define I2C_SMBUS_I2C_BLOCK_BROKEN  6
 592 #define I2C_SMBUS_BLOCK_PROC_CALL   7           /* SMBus 2.0 */
 593 #define I2C_SMBUS_I2C_BLOCK_DATA    8
 594
 595
 596 #ifdef __KERNEL__
 597
 598 /* These defines are used for probing i2c client addresses */
 599 /* The length of the option lists */
 600 #define I2C_CLIENT_MAX_OPTS 48
 601
 602 /* Default fill of many variables */
 603 #define I2C_CLIENT_DEFAULTS {I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
 604                              I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
 605                              I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
 606                              I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
 607                              I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
 608                              I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
 609                              I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
 610                              I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
 611                              I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
 612                              I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
 613                              I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
 614                              I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
 615                              I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
 616                              I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
 617                              I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
 618                              I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END}
 619
 620 /* I2C_CLIENT_MODULE_PARM creates a module parameter, and puts it in the
 621    module header */
 622
 623 #define I2C_CLIENT_MODULE_PARM(var,desc) \
 624   static unsigned short var[I2C_CLIENT_MAX_OPTS] = I2C_CLIENT_DEFAULTS; \
 625   static unsigned int var##_num; \
 626   module_param_array(var, short, &var##_num, 0); \
 627   MODULE_PARM_DESC(var, desc)
 628
 629 #define I2C_CLIENT_MODULE_PARM_FORCE(name)                              \
 630 I2C_CLIENT_MODULE_PARM(force_##name,                                    \
 631                        "List of adapter,address pairs which are "       \
 632                        "unquestionably assumed to contain a `"          \
 633                        # name "' chip")
 634
 635
 636 #define I2C_CLIENT_INSMOD_COMMON                                        \
 637 I2C_CLIENT_MODULE_PARM(probe, "List of adapter,address pairs to scan "  \
 638                        "additionally");                                 \
 639 I2C_CLIENT_MODULE_PARM(ignore, "List of adapter,address pairs not to "  \
 640                        "scan");                                         \
 641 static const struct i2c_client_address_data addr_data = {               \
 642         .normal_i2c     = normal_i2c,                                   \
 643         .probe          = probe,                                        \
 644         .ignore         = ignore,                                       \
 645         .forces         = forces,                                       \
 646 }
 647
 648 #define I2C_CLIENT_FORCE_TEXT \
 649         "List of adapter,address pairs to boldly assume to be present"
 650
 651 /* These are the ones you want to use in your own drivers. Pick the one
 652    which matches the number of devices the driver differenciates between. */
 653 #define I2C_CLIENT_INSMOD                                               \
 654 I2C_CLIENT_MODULE_PARM(force, I2C_CLIENT_FORCE_TEXT);                   \
 655 static const unsigned short * const forces[] = { force, NULL };         \
 656 I2C_CLIENT_INSMOD_COMMON
 657
 658 #define I2C_CLIENT_INSMOD_1(chip1)                                      \
 659 enum chips { any_chip, chip1 };                                         \
 660 I2C_CLIENT_MODULE_PARM(force, I2C_CLIENT_FORCE_TEXT);                   \
 661 I2C_CLIENT_MODULE_PARM_FORCE(chip1);                                    \
 662 static const unsigned short * const forces[] =  { force,                \
 663         force_##chip1, NULL };                                          \
 664 I2C_CLIENT_INSMOD_COMMON
 665
 666 #define I2C_CLIENT_INSMOD_2(chip1, chip2)                               \
 667 enum chips { any_chip, chip1, chip2 };                                  \
 668 I2C_CLIENT_MODULE_PARM(force, I2C_CLIENT_FORCE_TEXT);                   \
 669 I2C_CLIENT_MODULE_PARM_FORCE(chip1);                                    \
 670 I2C_CLIENT_MODULE_PARM_FORCE(chip2);                                    \
 671 static const unsigned short * const forces[] =  { force,                \
 672         force_##chip1, force_##chip2, NULL };                           \
 673 I2C_CLIENT_INSMOD_COMMON
 674
 675 #define I2C_CLIENT_INSMOD_3(chip1, chip2, chip3)                        \
 676 enum chips { any_chip, chip1, chip2, chip3 };                           \
 677 I2C_CLIENT_MODULE_PARM(force, I2C_CLIENT_FORCE_TEXT);                   \
 678 I2C_CLIENT_MODULE_PARM_FORCE(chip1);                                    \
 679 I2C_CLIENT_MODULE_PARM_FORCE(chip2);                                    \
 680 I2C_CLIENT_MODULE_PARM_FORCE(chip3);                                    \
 681 static const unsigned short * const forces[] =  { force,                \
 682         force_##chip1, force_##chip2, force_##chip3, NULL };            \
 683 I2C_CLIENT_INSMOD_COMMON
 684
 685 #define I2C_CLIENT_INSMOD_4(chip1, chip2, chip3, chip4)                 \
 686 enum chips { any_chip, chip1, chip2, chip3, chip4 };                    \
 687 I2C_CLIENT_MODULE_PARM(force, I2C_CLIENT_FORCE_TEXT);                   \
 688 I2C_CLIENT_MODULE_PARM_FORCE(chip1);                                    \
 689 I2C_CLIENT_MODULE_PARM_FORCE(chip2);                                    \
 690 I2C_CLIENT_MODULE_PARM_FORCE(chip3);                                    \
 691 I2C_CLIENT_MODULE_PARM_FORCE(chip4);                                    \
 692 static const unsigned short * const forces[] =  { force,                \
 693         force_##chip1, force_##chip2, force_##chip3,                    \
 694         force_##chip4, NULL};                                           \
 695 I2C_CLIENT_INSMOD_COMMON
 696
 697 #define I2C_CLIENT_INSMOD_5(chip1, chip2, chip3, chip4, chip5)          \
 698 enum chips { any_chip, chip1, chip2, chip3, chip4, chip5 };             \
 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 static const unsigned short * const forces[] = { force,                 \
 706         force_##chip1, force_##chip2, force_##chip3,                    \
 707         force_##chip4, force_##chip5, NULL };                           \
 708 I2C_CLIENT_INSMOD_COMMON
 709
 710 #define I2C_CLIENT_INSMOD_6(chip1, chip2, chip3, chip4, chip5, chip6)   \
 711 enum chips { any_chip, chip1, chip2, chip3, chip4, chip5, chip6 };      \
 712 I2C_CLIENT_MODULE_PARM(force, I2C_CLIENT_FORCE_TEXT);                   \
 713 I2C_CLIENT_MODULE_PARM_FORCE(chip1);                                    \
 714 I2C_CLIENT_MODULE_PARM_FORCE(chip2);                                    \
 715 I2C_CLIENT_MODULE_PARM_FORCE(chip3);                                    \
 716 I2C_CLIENT_MODULE_PARM_FORCE(chip4);                                    \
 717 I2C_CLIENT_MODULE_PARM_FORCE(chip5);                                    \
 718 I2C_CLIENT_MODULE_PARM_FORCE(chip6);                                    \
 719 static const unsigned short * const forces[] = { force,                 \
 720         force_##chip1, force_##chip2, force_##chip3,                    \
 721         force_##chip4, force_##chip5, force_##chip6, NULL };            \
 722 I2C_CLIENT_INSMOD_COMMON
 723
 724 #define I2C_CLIENT_INSMOD_7(chip1, chip2, chip3, chip4, chip5, chip6, chip7) \
 725 enum chips { any_chip, chip1, chip2, chip3, chip4, chip5, chip6,        \
 726              chip7 };                                                   \
 727 I2C_CLIENT_MODULE_PARM(force, I2C_CLIENT_FORCE_TEXT);                   \
 728 I2C_CLIENT_MODULE_PARM_FORCE(chip1);                                    \
 729 I2C_CLIENT_MODULE_PARM_FORCE(chip2);                                    \
 730 I2C_CLIENT_MODULE_PARM_FORCE(chip3);                                    \
 731 I2C_CLIENT_MODULE_PARM_FORCE(chip4);                                    \
 732 I2C_CLIENT_MODULE_PARM_FORCE(chip5);                                    \
 733 I2C_CLIENT_MODULE_PARM_FORCE(chip6);                                    \
 734 I2C_CLIENT_MODULE_PARM_FORCE(chip7);                                    \
 735 static const unsigned short * const forces[] = { force,                 \
 736         force_##chip1, force_##chip2, force_##chip3,                    \
 737         force_##chip4, force_##chip5, force_##chip6,                    \
 738         force_##chip7, NULL };                                          \
 739 I2C_CLIENT_INSMOD_COMMON
 740
 741 #define I2C_CLIENT_INSMOD_8(chip1, chip2, chip3, chip4, chip5, chip6, chip7, chip8) \
 742 enum chips { any_chip, chip1, chip2, chip3, chip4, chip5, chip6,        \
 743              chip7, chip8 };                                            \
 744 I2C_CLIENT_MODULE_PARM(force, I2C_CLIENT_FORCE_TEXT);                   \
 745 I2C_CLIENT_MODULE_PARM_FORCE(chip1);                                    \
 746 I2C_CLIENT_MODULE_PARM_FORCE(chip2);                                    \
 747 I2C_CLIENT_MODULE_PARM_FORCE(chip3);                                    \
 748 I2C_CLIENT_MODULE_PARM_FORCE(chip4);                                    \
 749 I2C_CLIENT_MODULE_PARM_FORCE(chip5);                                    \
 750 I2C_CLIENT_MODULE_PARM_FORCE(chip6);                                    \
 751 I2C_CLIENT_MODULE_PARM_FORCE(chip7);                                    \
 752 I2C_CLIENT_MODULE_PARM_FORCE(chip8);                                    \
 753 static const unsigned short * const forces[] = { force,                 \
 754         force_##chip1, force_##chip2, force_##chip3,                    \
 755         force_##chip4, force_##chip5, force_##chip6,                    \
 756         force_##chip7, force_##chip8, NULL };                           \
 757 I2C_CLIENT_INSMOD_COMMON
 758 #endif /* __KERNEL__ */
 759 #endif /* _LINUX_I2C_H */