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 /* $Id: i2c.h,v 1.68 2003/01/21 08:08:16 kmalkki Exp $ */
  27
  28 #ifndef _LINUX_I2C_H
  29 #define _LINUX_I2C_H
  30
  31 #include <linux/module.h>
  32 #include <linux/types.h>
  33 #include <linux/i2c-id.h>
  34 #include <linux/device.h>       /* for struct device */
  35 #include <asm/semaphore.h>
  36
  37 /* --- For i2c-isa ---------------------------------------------------- */
  38
  39 extern void i2c_adapter_dev_release(struct device *dev);
  40 extern struct device_driver i2c_adapter_driver;
  41 extern struct class i2c_adapter_class;
  42 extern struct bus_type i2c_bus_type;
  43
  44 /* --- General options ------------------------------------------------ */
  45
  46 struct i2c_msg;
  47 struct i2c_algorithm;
  48 struct i2c_adapter;
  49 struct i2c_client;
  50 struct i2c_driver;
  51 union i2c_smbus_data;
  52
  53 /*
  54  * The master routines are the ones normally used to transmit data to devices
  55  * on a bus (or read from them). Apart from two basic transfer functions to
  56  * transmit one message at a time, a more complex version can be used to
  57  * transmit an arbitrary number of messages without interruption.
  58  */
  59 extern int i2c_master_send(struct i2c_client *,const char* ,int);
  60 extern int i2c_master_recv(struct i2c_client *,char* ,int);
  61
  62 /* Transfer num messages.
  63  */
  64 extern int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num);
  65
  66 /*
  67  * Some adapter types (i.e. PCF 8584 based ones) may support slave behaviuor.
  68  * This is not tested/implemented yet and will change in the future.
  69  */
  70 extern int i2c_slave_send(struct i2c_client *,char*,int);
  71 extern int i2c_slave_recv(struct i2c_client *,char*,int);
  72
  73
  74
  75 /* This is the very generalized SMBus access routine. You probably do not
  76    want to use this, though; one of the functions below may be much easier,
  77    and probably just as fast.
  78    Note that we use i2c_adapter here, because you do not need a specific
  79    smbus adapter to call this function. */
  80 extern s32 i2c_smbus_xfer (struct i2c_adapter * adapter, u16 addr,
  81                            unsigned short flags,
  82                            char read_write, u8 command, int size,
  83                            union i2c_smbus_data * data);
  84
  85 /* Now follow the 'nice' access routines. These also document the calling
  86    conventions of smbus_access. */
  87
  88 extern s32 i2c_smbus_write_quick(struct i2c_client * client, u8 value);
  89 extern s32 i2c_smbus_read_byte(struct i2c_client * client);
  90 extern s32 i2c_smbus_write_byte(struct i2c_client * client, u8 value);
  91 extern s32 i2c_smbus_read_byte_data(struct i2c_client * client, u8 command);
  92 extern s32 i2c_smbus_write_byte_data(struct i2c_client * client,
  93                                      u8 command, u8 value);
  94 extern s32 i2c_smbus_read_word_data(struct i2c_client * client, u8 command);
  95 extern s32 i2c_smbus_write_word_data(struct i2c_client * client,
  96                                      u8 command, u16 value);
  97 /* Returns the number of bytes transferred */
  98 extern s32 i2c_smbus_write_block_data(struct i2c_client * client,
  99                                       u8 command, u8 length,
 100                                       u8 *values);
 101 extern s32 i2c_smbus_read_i2c_block_data(struct i2c_client * client,
 102                                          u8 command, u8 *values);
 103
 104 /*
 105  * A driver is capable of handling one or more physical devices present on
 106  * I2C adapters. This information is used to inform the driver of adapter
 107  * events.
 108  */
 109
 110 struct i2c_driver {
 111         struct module *owner;
 112         char name[32];
 113         int id;
 114         unsigned int class;
 115         unsigned int flags;             /* div., see below              */
 116
 117         /* Notifies the driver that a new bus has appeared. This routine
 118          * can be used by the driver to test if the bus meets its conditions
 119          * & seek for the presence of the chip(s) it supports. If found, it
 120          * registers the client(s) that are on the bus to the i2c admin. via
 121          * i2c_attach_client.
 122          */
 123         int (*attach_adapter)(struct i2c_adapter *);
 124         int (*detach_adapter)(struct i2c_adapter *);
 125
 126         /* tells the driver that a client is about to be deleted & gives it
 127          * the chance to remove its private data. Also, if the client struct
 128          * has been dynamically allocated by the driver in the function above,
 129          * it must be freed here.
 130          */
 131         int (*detach_client)(struct i2c_client *);
 132
 133         /* a ioctl like command that can be used to perform specific functions
 134          * with the device.
 135          */
 136         int (*command)(struct i2c_client *client,unsigned int cmd, void *arg);
 137
 138         struct device_driver driver;
 139         struct list_head list;
 140 };
 141 #define to_i2c_driver(d) container_of(d, struct i2c_driver, driver)
 142
 143 #define I2C_NAME_SIZE   50
 144
 145 /*
 146  * i2c_client identifies a single device (i.e. chip) that is connected to an
 147  * i2c bus. The behaviour is defined by the routines of the driver. This
 148  * function is mainly used for lookup & other admin. functions.
 149  */
 150 struct i2c_client {
 151         unsigned int flags;             /* div., see below              */
 152         unsigned short addr;            /* chip address - NOTE: 7bit    */
 153                                         /* addresses are stored in the  */
 154                                         /* _LOWER_ 7 bits               */
 155         struct i2c_adapter *adapter;    /* the adapter we sit on        */
 156         struct i2c_driver *driver;      /* and our access routines      */
 157         int usage_count;                /* How many accesses currently  */
 158                                         /* to the client                */
 159         struct device dev;              /* the device structure         */
 160         struct list_head list;
 161         char name[I2C_NAME_SIZE];
 162         struct completion released;
 163 };
 164 #define to_i2c_client(d) container_of(d, struct i2c_client, dev)
 165
 166 static inline struct i2c_client *kobj_to_i2c_client(struct kobject *kobj)
 167 {
 168         return to_i2c_client(container_of(kobj, struct device, kobj));
 169 }
 170
 171 static inline void *i2c_get_clientdata (struct i2c_client *dev)
 172 {
 173         return dev_get_drvdata (&dev->dev);
 174 }
 175
 176 static inline void i2c_set_clientdata (struct i2c_client *dev, void *data)
 177 {
 178         dev_set_drvdata (&dev->dev, data);
 179 }
 180
 181 /*
 182  * The following structs are for those who like to implement new bus drivers:
 183  * i2c_algorithm is the interface to a class of hardware solutions which can
 184  * be addressed using the same bus algorithms - i.e. bit-banging or the PCF8584
 185  * to name two of the most common.
 186  */
 187 struct i2c_algorithm {
 188         /* If an adapter algorithm can't do I2C-level access, set master_xfer
 189            to NULL. If an adapter algorithm can do SMBus access, set
 190            smbus_xfer. If set to NULL, the SMBus protocol is simulated
 191            using common I2C messages */
 192         int (*master_xfer)(struct i2c_adapter *adap,struct i2c_msg *msgs,
 193                            int num);
 194         int (*smbus_xfer) (struct i2c_adapter *adap, u16 addr,
 195                            unsigned short flags, char read_write,
 196                            u8 command, int size, union i2c_smbus_data * data);
 197
 198         /* --- these optional/future use for some adapter types.*/
 199         int (*slave_send)(struct i2c_adapter *,char*,int);
 200         int (*slave_recv)(struct i2c_adapter *,char*,int);
 201
 202         /* --- ioctl like call to set div. parameters. */
 203         int (*algo_control)(struct i2c_adapter *, unsigned int, unsigned long);
 204
 205         /* To determine what the adapter supports */
 206         u32 (*functionality) (struct i2c_adapter *);
 207 };
 208
 209 /*
 210  * i2c_adapter is the structure used to identify a physical i2c bus along
 211  * with the access algorithms necessary to access it.
 212  */
 213 struct i2c_adapter {
 214         struct module *owner;
 215         unsigned int id;
 216         unsigned int class;
 217         struct i2c_algorithm *algo;/* the algorithm to access the bus   */
 218         void *algo_data;
 219
 220         /* --- administration stuff. */
 221         int (*client_register)(struct i2c_client *);
 222         int (*client_unregister)(struct i2c_client *);
 223
 224         /* data fields that are valid for all devices   */
 225         struct semaphore bus_lock;
 226         struct semaphore clist_lock;
 227
 228         int timeout;
 229         int retries;
 230         struct device dev;              /* the adapter device */
 231         struct class_device class_dev;  /* the class device */
 232
 233 #ifdef CONFIG_PROC_FS
 234         /* No need to set this when you initialize the adapter          */
 235         int inode;
 236 #endif /* def CONFIG_PROC_FS */
 237
 238         int nr;
 239         struct list_head clients;
 240         struct list_head list;
 241         char name[I2C_NAME_SIZE];
 242         struct completion dev_released;
 243         struct completion class_dev_released;
 244 };
 245 #define dev_to_i2c_adapter(d) container_of(d, struct i2c_adapter, dev)
 246 #define class_dev_to_i2c_adapter(d) container_of(d, struct i2c_adapter, class_dev)
 247
 248 static inline void *i2c_get_adapdata (struct i2c_adapter *dev)
 249 {
 250         return dev_get_drvdata (&dev->dev);
 251 }
 252
 253 static inline void i2c_set_adapdata (struct i2c_adapter *dev, void *data)
 254 {
 255         dev_set_drvdata (&dev->dev, data);
 256 }
 257
 258 /*flags for the driver struct: */
 259 #define I2C_DF_NOTIFY   0x01            /* notify on bus (de/a)ttaches  */
 260 #if 0
 261 /* this flag is gone -- there is a (optional) driver->detach_adapter
 262  * callback now which can be used instead */
 263 # define I2C_DF_DUMMY   0x02
 264 #endif
 265
 266 /*flags for the client struct: */
 267 #define I2C_CLIENT_ALLOW_USE            0x01    /* Client allows access */
 268 #define I2C_CLIENT_ALLOW_MULTIPLE_USE   0x02    /* Allow multiple access-locks */
 269                                                 /* on an i2c_client */
 270 #define I2C_CLIENT_PEC  0x04                    /* Use Packet Error Checking */
 271 #define I2C_CLIENT_TEN  0x10                    /* we have a ten bit chip address       */
 272                                                 /* Must equal I2C_M_TEN below */
 273
 274 /* i2c adapter classes (bitmask) */
 275 #define I2C_CLASS_HWMON         (1<<0)  /* lm_sensors, ... */
 276 #define I2C_CLASS_TV_ANALOG     (1<<1)  /* bttv + friends */
 277 #define I2C_CLASS_TV_DIGITAL    (1<<2)  /* dvb cards */
 278 #define I2C_CLASS_DDC           (1<<3)  /* i2c-matroxfb ? */
 279 #define I2C_CLASS_CAM_ANALOG    (1<<4)  /* camera with analog CCD */
 280 #define I2C_CLASS_CAM_DIGITAL   (1<<5)  /* most webcams */
 281 #define I2C_CLASS_SOUND         (1<<6)  /* sound devices */
 282 #define I2C_CLASS_ALL           (UINT_MAX) /* all of the above */
 283
 284 /* i2c_client_address_data is the struct for holding default client
 285  * addresses for a driver and for the parameters supplied on the
 286  * command line
 287  */
 288 struct i2c_client_address_data {
 289         unsigned short *normal_i2c;
 290         unsigned short *probe;
 291         unsigned short *ignore;
 292         unsigned short **forces;
 293 };
 294
 295 /* Internal numbers to terminate lists */
 296 #define I2C_CLIENT_END          0xfffeU
 297
 298 /* The numbers to use to set I2C bus address */
 299 #define ANY_I2C_BUS             0xffff
 300 #define ANY_I2C_ISA_BUS         9191
 301
 302
 303 /* ----- functions exported by i2c.o */
 304
 305 /* administration...
 306  */
 307 extern int i2c_add_adapter(struct i2c_adapter *);
 308 extern int i2c_del_adapter(struct i2c_adapter *);
 309
 310 extern int i2c_add_driver(struct i2c_driver *);
 311 extern int i2c_del_driver(struct i2c_driver *);
 312
 313 extern int i2c_attach_client(struct i2c_client *);
 314 extern int i2c_detach_client(struct i2c_client *);
 315
 316 /* New function: This is to get an i2c_client-struct for controlling the
 317    client either by using i2c_control-function or having the
 318    client-module export functions that can be used with the i2c_client
 319    -struct. */
 320 extern struct i2c_client *i2c_get_client(int driver_id, int adapter_id,
 321                                         struct i2c_client *prev);
 322
 323 /* Should be used with new function
 324    extern struct i2c_client *i2c_get_client(int,int,struct i2c_client *);
 325    to make sure that client-struct is valid and that it is okay to access
 326    the i2c-client.
 327    returns -EACCES if client doesn't allow use (default)
 328    returns -EBUSY if client doesn't allow multiple use (default) and
 329    usage_count >0 */
 330 extern int i2c_use_client(struct i2c_client *);
 331 extern int i2c_release_client(struct i2c_client *);
 332
 333 /* call the i2c_client->command() of all attached clients with
 334  * the given arguments */
 335 extern void i2c_clients_command(struct i2c_adapter *adap,
 336                                 unsigned int cmd, void *arg);
 337
 338 /* returns -EBUSY if address has been taken, 0 if not. Note that the only
 339    other place at which this is called is within i2c_attach_client; so
 340    you can cheat by simply not registering. Not recommended, of course! */
 341 extern int i2c_check_addr (struct i2c_adapter *adapter, int addr);
 342
 343 /* Detect function. It iterates over all possible addresses itself.
 344  * It will only call found_proc if some client is connected at the
 345  * specific address (unless a 'force' matched);
 346  */
 347 extern int i2c_probe(struct i2c_adapter *adapter,
 348                 struct i2c_client_address_data *address_data,
 349                 int (*found_proc) (struct i2c_adapter *, int, int));
 350
 351 /* An ioctl like call to set div. parameters of the adapter.
 352  */
 353 extern int i2c_control(struct i2c_client *,unsigned int, unsigned long);
 354
 355 extern struct i2c_adapter* i2c_get_adapter(int id);
 356 extern void i2c_put_adapter(struct i2c_adapter *adap);
 357
 358
 359 /* Return the functionality mask */
 360 static inline u32 i2c_get_functionality(struct i2c_adapter *adap)
 361 {
 362         return adap->algo->functionality(adap);
 363 }
 364
 365 /* Return 1 if adapter supports everything we need, 0 if not. */
 366 static inline int i2c_check_functionality(struct i2c_adapter *adap, u32 func)
 367 {
 368         return (func & i2c_get_functionality(adap)) == func;
 369 }
 370
 371 /* Return id number for a specific adapter */
 372 static inline int i2c_adapter_id(struct i2c_adapter *adap)
 373 {
 374         return adap->nr;
 375 }
 376
 377 /*
 378  * I2C Message - used for pure i2c transaction, also from /dev interface
 379  */
 380 struct i2c_msg {
 381         __u16 addr;     /* slave address                        */
 382         __u16 flags;
 383 #define I2C_M_TEN       0x10    /* we have a ten bit chip address       */
 384 #define I2C_M_RD        0x01
 385 #define I2C_M_NOSTART   0x4000
 386 #define I2C_M_REV_DIR_ADDR      0x2000
 387 #define I2C_M_IGNORE_NAK        0x1000
 388 #define I2C_M_NO_RD_ACK         0x0800
 389         __u16 len;              /* msg length                           */
 390         __u8 *buf;              /* pointer to msg data                  */
 391 };
 392
 393 /* To determine what functionality is present */
 394
 395 #define I2C_FUNC_I2C                    0x00000001
 396 #define I2C_FUNC_10BIT_ADDR             0x00000002
 397 #define I2C_FUNC_PROTOCOL_MANGLING      0x00000004 /* I2C_M_{REV_DIR_ADDR,NOSTART,..} */
 398 #define I2C_FUNC_SMBUS_HWPEC_CALC       0x00000008 /* SMBus 2.0 */
 399 #define I2C_FUNC_SMBUS_READ_WORD_DATA_PEC  0x00000800 /* SMBus 2.0 */
 400 #define I2C_FUNC_SMBUS_WRITE_WORD_DATA_PEC 0x00001000 /* SMBus 2.0 */
 401 #define I2C_FUNC_SMBUS_PROC_CALL_PEC    0x00002000 /* SMBus 2.0 */
 402 #define I2C_FUNC_SMBUS_BLOCK_PROC_CALL_PEC 0x00004000 /* SMBus 2.0 */
 403 #define I2C_FUNC_SMBUS_BLOCK_PROC_CALL  0x00008000 /* SMBus 2.0 */
 404 #define I2C_FUNC_SMBUS_QUICK            0x00010000
 405 #define I2C_FUNC_SMBUS_READ_BYTE        0x00020000
 406 #define I2C_FUNC_SMBUS_WRITE_BYTE       0x00040000
 407 #define I2C_FUNC_SMBUS_READ_BYTE_DATA   0x00080000
 408 #define I2C_FUNC_SMBUS_WRITE_BYTE_DATA  0x00100000
 409 #define I2C_FUNC_SMBUS_READ_WORD_DATA   0x00200000
 410 #define I2C_FUNC_SMBUS_WRITE_WORD_DATA  0x00400000
 411 #define I2C_FUNC_SMBUS_PROC_CALL        0x00800000
 412 #define I2C_FUNC_SMBUS_READ_BLOCK_DATA  0x01000000
 413 #define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA 0x02000000
 414 #define I2C_FUNC_SMBUS_READ_I2C_BLOCK   0x04000000 /* I2C-like block xfer  */
 415 #define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK  0x08000000 /* w/ 1-byte reg. addr. */
 416 #define I2C_FUNC_SMBUS_READ_I2C_BLOCK_2  0x10000000 /* I2C-like block xfer  */
 417 #define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK_2 0x20000000 /* w/ 2-byte reg. addr. */
 418 #define I2C_FUNC_SMBUS_READ_BLOCK_DATA_PEC  0x40000000 /* SMBus 2.0 */
 419 #define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA_PEC 0x80000000 /* SMBus 2.0 */
 420
 421 #define I2C_FUNC_SMBUS_BYTE (I2C_FUNC_SMBUS_READ_BYTE | \
 422                              I2C_FUNC_SMBUS_WRITE_BYTE)
 423 #define I2C_FUNC_SMBUS_BYTE_DATA (I2C_FUNC_SMBUS_READ_BYTE_DATA | \
 424                                   I2C_FUNC_SMBUS_WRITE_BYTE_DATA)
 425 #define I2C_FUNC_SMBUS_WORD_DATA (I2C_FUNC_SMBUS_READ_WORD_DATA | \
 426                                   I2C_FUNC_SMBUS_WRITE_WORD_DATA)
 427 #define I2C_FUNC_SMBUS_BLOCK_DATA (I2C_FUNC_SMBUS_READ_BLOCK_DATA | \
 428                                    I2C_FUNC_SMBUS_WRITE_BLOCK_DATA)
 429 #define I2C_FUNC_SMBUS_I2C_BLOCK (I2C_FUNC_SMBUS_READ_I2C_BLOCK | \
 430                                   I2C_FUNC_SMBUS_WRITE_I2C_BLOCK)
 431 #define I2C_FUNC_SMBUS_I2C_BLOCK_2 (I2C_FUNC_SMBUS_READ_I2C_BLOCK_2 | \
 432                                     I2C_FUNC_SMBUS_WRITE_I2C_BLOCK_2)
 433 #define I2C_FUNC_SMBUS_BLOCK_DATA_PEC (I2C_FUNC_SMBUS_READ_BLOCK_DATA_PEC | \
 434                                        I2C_FUNC_SMBUS_WRITE_BLOCK_DATA_PEC)
 435 #define I2C_FUNC_SMBUS_WORD_DATA_PEC  (I2C_FUNC_SMBUS_READ_WORD_DATA_PEC | \
 436                                        I2C_FUNC_SMBUS_WRITE_WORD_DATA_PEC)
 437
 438 #define I2C_FUNC_SMBUS_READ_BYTE_PEC            I2C_FUNC_SMBUS_READ_BYTE_DATA
 439 #define I2C_FUNC_SMBUS_WRITE_BYTE_PEC           I2C_FUNC_SMBUS_WRITE_BYTE_DATA
 440 #define I2C_FUNC_SMBUS_READ_BYTE_DATA_PEC       I2C_FUNC_SMBUS_READ_WORD_DATA
 441 #define I2C_FUNC_SMBUS_WRITE_BYTE_DATA_PEC      I2C_FUNC_SMBUS_WRITE_WORD_DATA
 442 #define I2C_FUNC_SMBUS_BYTE_PEC                 I2C_FUNC_SMBUS_BYTE_DATA
 443 #define I2C_FUNC_SMBUS_BYTE_DATA_PEC            I2C_FUNC_SMBUS_WORD_DATA
 444
 445 #define I2C_FUNC_SMBUS_EMUL (I2C_FUNC_SMBUS_QUICK | \
 446                              I2C_FUNC_SMBUS_BYTE | \
 447                              I2C_FUNC_SMBUS_BYTE_DATA | \
 448                              I2C_FUNC_SMBUS_WORD_DATA | \
 449                              I2C_FUNC_SMBUS_PROC_CALL | \
 450                              I2C_FUNC_SMBUS_WRITE_BLOCK_DATA | \
 451                              I2C_FUNC_SMBUS_WRITE_BLOCK_DATA_PEC | \
 452                              I2C_FUNC_SMBUS_I2C_BLOCK)
 453
 454 /*
 455  * Data for SMBus Messages
 456  */
 457 #define I2C_SMBUS_BLOCK_MAX     32      /* As specified in SMBus standard */
 458 #define I2C_SMBUS_I2C_BLOCK_MAX 32      /* Not specified but we use same structure */
 459 union i2c_smbus_data {
 460         __u8 byte;
 461         __u16 word;
 462         __u8 block[I2C_SMBUS_BLOCK_MAX + 3]; /* block[0] is used for length */
 463                           /* one more for read length in block process call */
 464                                                     /* and one more for PEC */
 465 };
 466
 467 /* smbus_access read or write markers */
 468 #define I2C_SMBUS_READ  1
 469 #define I2C_SMBUS_WRITE 0
 470
 471 /* SMBus transaction types (size parameter in the above functions)
 472    Note: these no longer correspond to the (arbitrary) PIIX4 internal codes! */
 473 #define I2C_SMBUS_QUICK             0
 474 #define I2C_SMBUS_BYTE              1
 475 #define I2C_SMBUS_BYTE_DATA         2
 476 #define I2C_SMBUS_WORD_DATA         3
 477 #define I2C_SMBUS_PROC_CALL         4
 478 #define I2C_SMBUS_BLOCK_DATA        5
 479 #define I2C_SMBUS_I2C_BLOCK_DATA    6
 480 #define I2C_SMBUS_BLOCK_PROC_CALL   7           /* SMBus 2.0 */
 481 #define I2C_SMBUS_BLOCK_DATA_PEC    8           /* SMBus 2.0 */
 482 #define I2C_SMBUS_PROC_CALL_PEC     9           /* SMBus 2.0 */
 483 #define I2C_SMBUS_BLOCK_PROC_CALL_PEC  10       /* SMBus 2.0 */
 484 #define I2C_SMBUS_WORD_DATA_PEC    11           /* SMBus 2.0 */
 485
 486
 487 /* ----- commands for the ioctl like i2c_command call:
 488  * note that additional calls are defined in the algorithm and hw
 489  *      dependent layers - these can be listed here, or see the
 490  *      corresponding header files.
 491  */
 492                                 /* -> bit-adapter specific ioctls       */
 493 #define I2C_RETRIES     0x0701  /* number of times a device address      */
 494                                 /* should be polled when not            */
 495                                 /* acknowledging                        */
 496 #define I2C_TIMEOUT     0x0702  /* set timeout - call with int          */
 497
 498
 499 /* this is for i2c-dev.c        */
 500 #define I2C_SLAVE       0x0703  /* Change slave address                 */
 501                                 /* Attn.: Slave address is 7 or 10 bits */
 502 #define I2C_SLAVE_FORCE 0x0706  /* Change slave address                 */
 503                                 /* Attn.: Slave address is 7 or 10 bits */
 504                                 /* This changes the address, even if it */
 505                                 /* is already taken!                    */
 506 #define I2C_TENBIT      0x0704  /* 0 for 7 bit addrs, != 0 for 10 bit   */
 507
 508 #define I2C_FUNCS       0x0705  /* Get the adapter functionality */
 509 #define I2C_RDWR        0x0707  /* Combined R/W transfer (one stop only)*/
 510 #define I2C_PEC         0x0708  /* != 0 for SMBus PEC                   */
 511
 512 #define I2C_SMBUS       0x0720  /* SMBus-level access */
 513
 514 /* ... algo-bit.c recognizes */
 515 #define I2C_UDELAY      0x0705  /* set delay in microsecs between each  */
 516                                 /* written byte (except address)        */
 517 #define I2C_MDELAY      0x0706  /* millisec delay between written bytes */
 518
 519 /* ----- I2C-DEV: char device interface stuff ------------------------- */
 520
 521 #define I2C_MAJOR       89              /* Device major number          */
 522
 523 /* These defines are used for probing i2c client addresses */
 524 /* The length of the option lists */
 525 #define I2C_CLIENT_MAX_OPTS 48
 526
 527 /* Default fill of many variables */
 528 #define I2C_CLIENT_DEFAULTS {I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
 529                           I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
 530                           I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
 531                           I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
 532                           I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
 533                           I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
 534                           I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
 535                           I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
 536                           I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
 537                           I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
 538                           I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
 539                           I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
 540                           I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
 541                           I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
 542                           I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
 543                           I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END}
 544
 545 /* I2C_CLIENT_MODULE_PARM creates a module parameter, and puts it in the
 546    module header */
 547
 548 #define I2C_CLIENT_MODULE_PARM(var,desc) \
 549   static unsigned short var[I2C_CLIENT_MAX_OPTS] = I2C_CLIENT_DEFAULTS; \
 550   static unsigned int var##_num; \
 551   module_param_array(var, short, &var##_num, 0); \
 552   MODULE_PARM_DESC(var,desc)
 553
 554 #define I2C_CLIENT_MODULE_PARM_FORCE(name)                              \
 555 I2C_CLIENT_MODULE_PARM(force_##name,                                    \
 556                        "List of adapter,address pairs which are "       \
 557                        "unquestionably assumed to contain a `"          \
 558                        # name "' chip")
 559
 560
 561 #define I2C_CLIENT_INSMOD_COMMON                                        \
 562 I2C_CLIENT_MODULE_PARM(probe, "List of adapter,address pairs to scan "  \
 563                        "additionally");                                 \
 564 I2C_CLIENT_MODULE_PARM(ignore, "List of adapter,address pairs not to "  \
 565                        "scan");                                         \
 566 static struct i2c_client_address_data addr_data = {                     \
 567         .normal_i2c     = normal_i2c,                                   \
 568         .probe          = probe,                                        \
 569         .ignore         = ignore,                                       \
 570         .forces         = forces,                                       \
 571 }
 572
 573 /* These are the ones you want to use in your own drivers. Pick the one
 574    which matches the number of devices the driver differenciates between. */
 575 #define I2C_CLIENT_INSMOD \
 576   I2C_CLIENT_MODULE_PARM(force, \
 577                       "List of adapter,address pairs to boldly assume " \
 578                       "to be present"); \
 579         static unsigned short *forces[] = {                             \
 580                         force,                                          \
 581                         NULL                                            \
 582                 };                                                      \
 583 I2C_CLIENT_INSMOD_COMMON
 584
 585 #define I2C_CLIENT_INSMOD_1(chip1)                                      \
 586 enum chips { any_chip, chip1 };                                         \
 587 I2C_CLIENT_MODULE_PARM(force, "List of adapter,address pairs to "       \
 588                        "boldly assume to be present");                  \
 589 I2C_CLIENT_MODULE_PARM_FORCE(chip1);                                    \
 590 static unsigned short *forces[] = { force, force_##chip1, NULL };       \
 591 I2C_CLIENT_INSMOD_COMMON
 592
 593 #define I2C_CLIENT_INSMOD_2(chip1, chip2)                               \
 594 enum chips { any_chip, chip1, chip2 };                                  \
 595 I2C_CLIENT_MODULE_PARM(force, "List of adapter,address pairs to "       \
 596                        "boldly assume to be present");                  \
 597 I2C_CLIENT_MODULE_PARM_FORCE(chip1);                                    \
 598 I2C_CLIENT_MODULE_PARM_FORCE(chip2);                                    \
 599 static unsigned short *forces[] = { force, force_##chip1,               \
 600                                     force_##chip2, NULL };              \
 601 I2C_CLIENT_INSMOD_COMMON
 602
 603 #define I2C_CLIENT_INSMOD_3(chip1, chip2, chip3)                        \
 604 enum chips { any_chip, chip1, chip2, chip3 };                           \
 605 I2C_CLIENT_MODULE_PARM(force, "List of adapter,address pairs to "       \
 606                        "boldly assume to be present");                  \
 607 I2C_CLIENT_MODULE_PARM_FORCE(chip1);                                    \
 608 I2C_CLIENT_MODULE_PARM_FORCE(chip2);                                    \
 609 I2C_CLIENT_MODULE_PARM_FORCE(chip3);                                    \
 610 static unsigned short *forces[] = { force, force_##chip1,               \
 611                                     force_##chip2, force_##chip3,       \
 612                                     NULL };                             \
 613 I2C_CLIENT_INSMOD_COMMON
 614
 615 #define I2C_CLIENT_INSMOD_4(chip1, chip2, chip3, chip4)                 \
 616 enum chips { any_chip, chip1, chip2, chip3, chip4 };                    \
 617 I2C_CLIENT_MODULE_PARM(force, "List of adapter,address pairs to "       \
 618                        "boldly assume to be present");                  \
 619 I2C_CLIENT_MODULE_PARM_FORCE(chip1);                                    \
 620 I2C_CLIENT_MODULE_PARM_FORCE(chip2);                                    \
 621 I2C_CLIENT_MODULE_PARM_FORCE(chip3);                                    \
 622 I2C_CLIENT_MODULE_PARM_FORCE(chip4);                                    \
 623 static unsigned short *forces[] = { force, force_##chip1,               \
 624                                     force_##chip2, force_##chip3,       \
 625                                     force_##chip4, NULL};               \
 626 I2C_CLIENT_INSMOD_COMMON
 627
 628 #define I2C_CLIENT_INSMOD_5(chip1, chip2, chip3, chip4, chip5)          \
 629 enum chips { any_chip, chip1, chip2, chip3, chip4, chip5 };             \
 630 I2C_CLIENT_MODULE_PARM(force, "List of adapter,address pairs to "       \
 631                        "boldly assume to be present");                  \
 632 I2C_CLIENT_MODULE_PARM_FORCE(chip1);                                    \
 633 I2C_CLIENT_MODULE_PARM_FORCE(chip2);                                    \
 634 I2C_CLIENT_MODULE_PARM_FORCE(chip3);                                    \
 635 I2C_CLIENT_MODULE_PARM_FORCE(chip4);                                    \
 636 I2C_CLIENT_MODULE_PARM_FORCE(chip5);                                    \
 637 static unsigned short *forces[] = { force, force_##chip1,               \
 638                                     force_##chip2, force_##chip3,       \
 639                                     force_##chip4, force_##chip5,       \
 640                                     NULL };                             \
 641 I2C_CLIENT_INSMOD_COMMON
 642
 643 #define I2C_CLIENT_INSMOD_6(chip1, chip2, chip3, chip4, chip5, chip6)   \
 644 enum chips { any_chip, chip1, chip2, chip3, chip4, chip5, chip6 };      \
 645 I2C_CLIENT_MODULE_PARM(force, "List of adapter,address pairs to "       \
 646                        "boldly assume to be present");                  \
 647 I2C_CLIENT_MODULE_PARM_FORCE(chip1);                                    \
 648 I2C_CLIENT_MODULE_PARM_FORCE(chip2);                                    \
 649 I2C_CLIENT_MODULE_PARM_FORCE(chip3);                                    \
 650 I2C_CLIENT_MODULE_PARM_FORCE(chip4);                                    \
 651 I2C_CLIENT_MODULE_PARM_FORCE(chip5);                                    \
 652 I2C_CLIENT_MODULE_PARM_FORCE(chip6);                                    \
 653 static unsigned short *forces[] = { force, force_##chip1,               \
 654                                     force_##chip2, force_##chip3,       \
 655                                     force_##chip4, force_##chip5,       \
 656                                     force_##chip6, NULL };              \
 657 I2C_CLIENT_INSMOD_COMMON
 658
 659 #define I2C_CLIENT_INSMOD_7(chip1, chip2, chip3, chip4, chip5, chip6, chip7) \
 660 enum chips { any_chip, chip1, chip2, chip3, chip4, chip5, chip6,        \
 661              chip7 };                                                   \
 662 I2C_CLIENT_MODULE_PARM(force, "List of adapter,address pairs to "       \
 663                        "boldly assume to be present");                  \
 664 I2C_CLIENT_MODULE_PARM_FORCE(chip1);                                    \
 665 I2C_CLIENT_MODULE_PARM_FORCE(chip2);                                    \
 666 I2C_CLIENT_MODULE_PARM_FORCE(chip3);                                    \
 667 I2C_CLIENT_MODULE_PARM_FORCE(chip4);                                    \
 668 I2C_CLIENT_MODULE_PARM_FORCE(chip5);                                    \
 669 I2C_CLIENT_MODULE_PARM_FORCE(chip6);                                    \
 670 I2C_CLIENT_MODULE_PARM_FORCE(chip7);                                    \
 671 static unsigned short *forces[] = { force, force_##chip1,               \
 672                                     force_##chip2, force_##chip3,       \
 673                                     force_##chip4, force_##chip5,       \
 674                                     force_##chip6, force_##chip7,       \
 675                                     NULL };                             \
 676 I2C_CLIENT_INSMOD_COMMON
 677
 678 #define I2C_CLIENT_INSMOD_8(chip1, chip2, chip3, chip4, chip5, chip6, chip7, chip8) \
 679 enum chips { any_chip, chip1, chip2, chip3, chip4, chip5, chip6,        \
 680              chip7, chip8 };                                            \
 681 I2C_CLIENT_MODULE_PARM(force, "List of adapter,address pairs to "       \
 682                        "boldly assume to be present");                  \
 683 I2C_CLIENT_MODULE_PARM_FORCE(chip1);                                    \
 684 I2C_CLIENT_MODULE_PARM_FORCE(chip2);                                    \
 685 I2C_CLIENT_MODULE_PARM_FORCE(chip3);                                    \
 686 I2C_CLIENT_MODULE_PARM_FORCE(chip4);                                    \
 687 I2C_CLIENT_MODULE_PARM_FORCE(chip5);                                    \
 688 I2C_CLIENT_MODULE_PARM_FORCE(chip6);                                    \
 689 I2C_CLIENT_MODULE_PARM_FORCE(chip7);                                    \
 690 I2C_CLIENT_MODULE_PARM_FORCE(chip8);                                    \
 691 static unsigned short *forces[] = { force, force_##chip1,               \
 692                                     force_##chip2, force_##chip3,       \
 693                                     force_##chip4, force_##chip5,       \
 694                                     force_##chip6, force_##chip7,       \
 695                                     force_##chip8, NULL };              \
 696 I2C_CLIENT_INSMOD_COMMON
 697
 698 #endif /* _LINUX_I2C_H */