1/* ------------------------------------------------------------------------- */ 2/* */ 3/* i2c.h - definitions for the i2c-bus interface */ 4/* */ 5/* ------------------------------------------------------------------------- */ 6/* Copyright (C) 1995-2000 Simon G. Vogl 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 2 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program; if not, write to the Free Software 20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ 21/* ------------------------------------------------------------------------- */ 22 23/* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and 24 Frodo Looijaard <frodol@dds.nl> */ 25 26#ifndef _LINUX_I2C_H 27#define _LINUX_I2C_H 28 29#include <linux/types.h> 30#ifdef __KERNEL__ 31#include <linux/module.h> 32#include <linux/i2c-id.h> 33#include <linux/mod_devicetable.h> 34#include <linux/device.h> /* for struct device */ 35#include <linux/sched.h> /* for completion */ 36#include <linux/mutex.h> 37#include <linux/of.h> /* for struct device_node */ 38 39extern struct bus_type i2c_bus_type; 40 41/* --- General options ------------------------------------------------ */ 42 43struct i2c_msg; 44struct i2c_algorithm; 45struct i2c_adapter; 46struct i2c_client; 47struct i2c_driver; 48union i2c_smbus_data; 49struct i2c_board_info; 50 51#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) 52/* 53 * The master routines are the ones normally used to transmit data to devices 54 * on a bus (or read from them). Apart from two basic transfer functions to 55 * transmit one message at a time, a more complex version can be used to 56 * transmit an arbitrary number of messages without interruption. 57 * @count must be be less than 64k since msg.len is u16. 58 */ 59extern int i2c_master_send(struct i2c_client *client, const char *buf, 60 int count); 61extern int i2c_master_recv(struct i2c_client *client, char *buf, int count); 62 63/* Transfer num messages. 64 */ 65extern int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, 66 int num); 67 68/* This is the very generalized SMBus access routine. You probably do not 69 want to use this, though; one of the functions below may be much easier, 70 and probably just as fast. 71 Note that we use i2c_adapter here, because you do not need a specific 72 smbus adapter to call this function. */ 73extern s32 i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr, 74 unsigned short flags, char read_write, u8 command, 75 int size, union i2c_smbus_data *data); 76 77/* Now follow the 'nice' access routines. These also document the calling 78 conventions of i2c_smbus_xfer. */ 79 80extern s32 i2c_smbus_read_byte(struct i2c_client *client); 81extern s32 i2c_smbus_write_byte(struct i2c_client *client, u8 value); 82extern s32 i2c_smbus_read_byte_data(struct i2c_client *client, u8 command); 83extern s32 i2c_smbus_write_byte_data(struct i2c_client *client, 84 u8 command, u8 value); 85extern s32 i2c_smbus_read_word_data(struct i2c_client *client, u8 command); 86extern s32 i2c_smbus_write_word_data(struct i2c_client *client, 87 u8 command, u16 value); 88/* Returns the number of read bytes */ 89extern s32 i2c_smbus_read_block_data(struct i2c_client *client, 90 u8 command, u8 *values); 91extern s32 i2c_smbus_write_block_data(struct i2c_client *client, 92 u8 command, u8 length, const u8 *values); 93/* Returns the number of read bytes */ 94extern s32 i2c_smbus_read_i2c_block_data(struct i2c_client *client, 95 u8 command, u8 length, u8 *values); 96extern s32 i2c_smbus_write_i2c_block_data(struct i2c_client *client, 97 u8 command, u8 length, 98 const u8 *values); 99#endif /* I2C */ 100 101/** 102 * struct i2c_driver - represent an I2C device driver 103 * @class: What kind of i2c device we instantiate (for detect) 104 * @attach_adapter: Callback for bus addition (for legacy drivers) 105 * @detach_adapter: Callback for bus removal (for legacy drivers) 106 * @probe: Callback for device binding 107 * @remove: Callback for device unbinding 108 * @shutdown: Callback for device shutdown 109 * @suspend: Callback for device suspend 110 * @resume: Callback for device resume 111 * @command: Callback for bus-wide signaling (optional) 112 * @driver: Device driver model driver 113 * @id_table: List of I2C devices supported by this driver 114 * @detect: Callback for device detection 115 * @address_list: The I2C addresses to probe (for detect) 116 * @clients: List of detected clients we created (for i2c-core use only) 117 * 118 * The driver.owner field should be set to the module owner of this driver. 119 * The driver.name field should be set to the name of this driver. 120 * 121 * For automatic device detection, both @detect and @address_data must 122 * be defined. @class should also be set, otherwise only devices forced 123 * with module parameters will be created. The detect function must 124 * fill at least the name field of the i2c_board_info structure it is 125 * handed upon successful detection, and possibly also the flags field. 126 * 127 * If @detect is missing, the driver will still work fine for enumerated 128 * devices. Detected devices simply won't be supported. This is expected 129 * for the many I2C/SMBus devices which can't be detected reliably, and 130 * the ones which can always be enumerated in practice. 131 * 132 * The i2c_client structure which is handed to the @detect callback is 133 * not a real i2c_client. It is initialized just enough so that you can 134 * call i2c_smbus_read_byte_data and friends on it. Don't do anything 135 * else with it. In particular, calling dev_dbg and friends on it is 136 * not allowed. 137 */ 138struct i2c_driver { 139 unsigned int class; 140 141 /* Notifies the driver that a new bus has appeared or is about to be 142 * removed. You should avoid using this if you can, it will probably 143 * be removed in a near future. 144 */ 145 int (*attach_adapter)(struct i2c_adapter *); 146 int (*detach_adapter)(struct i2c_adapter *); 147 148 /* Standard driver model interfaces */ 149 int (*probe)(struct i2c_client *, const struct i2c_device_id *); 150 int (*remove)(struct i2c_client *); 151 152 /* driver model interfaces that don't relate to enumeration */ 153 void (*shutdown)(struct i2c_client *); 154 int (*suspend)(struct i2c_client *, pm_message_t mesg); 155 int (*resume)(struct i2c_client *); 156 157 /* Alert callback, for example for the SMBus alert protocol. 158 * The format and meaning of the data value depends on the protocol. 159 * For the SMBus alert protocol, there is a single bit of data passed 160 * as the alert response's low bit ("event flag"). 161 */ 162 void (*alert)(struct i2c_client *, unsigned int data); 163 164 /* a ioctl like command that can be used to perform specific functions 165 * with the device. 166 */ 167 int (*command)(struct i2c_client *client, unsigned int cmd, void *arg); 168 169 struct device_driver driver; 170 const struct i2c_device_id *id_table; 171 172 /* Device detection callback for automatic device creation */ 173 int (*detect)(struct i2c_client *, struct i2c_board_info *); 174 const unsigned short *address_list; 175 struct list_head clients; 176}; 177#define to_i2c_driver(d) container_of(d, struct i2c_driver, driver) 178 179/** 180 * struct i2c_client - represent an I2C slave device 181 * @flags: I2C_CLIENT_TEN indicates the device uses a ten bit chip address; 182 * I2C_CLIENT_PEC indicates it uses SMBus Packet Error Checking 183 * @addr: Address used on the I2C bus connected to the parent adapter. 184 * @name: Indicates the type of the device, usually a chip name that's 185 * generic enough to hide second-sourcing and compatible revisions. 186 * @adapter: manages the bus segment hosting this I2C device 187 * @driver: device's driver, hence pointer to access routines 188 * @dev: Driver model device node for the slave. 189 * @irq: indicates the IRQ generated by this device (if any) 190 * @detected: member of an i2c_driver.clients list or i2c-core's 191 * userspace_devices list 192 * 193 * An i2c_client identifies a single device (i.e. chip) connected to an 194 * i2c bus. The behaviour exposed to Linux is defined by the driver 195 * managing the device. 196 */ 197struct i2c_client { 198 unsigned short flags; /* div., see below */ 199 unsigned short addr; /* chip address - NOTE: 7bit */ 200 /* addresses are stored in the */ 201 /* _LOWER_ 7 bits */ 202 char name[I2C_NAME_SIZE]; 203 struct i2c_adapter *adapter; /* the adapter we sit on */ 204 struct i2c_driver *driver; /* and our access routines */ 205 struct device dev; /* the device structure */ 206 int irq; /* irq issued by device */ 207 struct list_head detected; 208}; 209#define to_i2c_client(d) container_of(d, struct i2c_client, dev) 210 211extern struct i2c_client *i2c_verify_client(struct device *dev); 212 213static inline struct i2c_client *kobj_to_i2c_client(struct kobject *kobj) 214{ 215 struct device * const dev = container_of(kobj, struct device, kobj); 216 return to_i2c_client(dev); 217} 218 219static inline void *i2c_get_clientdata(const struct i2c_client *dev) 220{ 221 return dev_get_drvdata(&dev->dev); 222} 223 224static inline void i2c_set_clientdata(struct i2c_client *dev, void *data) 225{ 226 dev_set_drvdata(&dev->dev, data); 227} 228 229/** 230 * struct i2c_board_info - template for device creation 231 * @type: chip type, to initialize i2c_client.name 232 * @flags: to initialize i2c_client.flags 233 * @addr: stored in i2c_client.addr 234 * @platform_data: stored in i2c_client.dev.platform_data 235 * @archdata: copied into i2c_client.dev.archdata 236 * @irq: stored in i2c_client.irq 237 * 238 * I2C doesn't actually support hardware probing, although controllers and 239 * devices may be able to use I2C_SMBUS_QUICK to tell whether or not there's 240 * a device at a given address. Drivers commonly need more information than 241 * that, such as chip type, configuration, associated IRQ, and so on. 242 * 243 * i2c_board_info is used to build tables of information listing I2C devices 244 * that are present. This information is used to grow the driver model tree. 245 * For mainboards this is done statically using i2c_register_board_info(); 246 * bus numbers identify adapters that aren't yet available. For add-on boards, 247 * i2c_new_device() does this dynamically with the adapter already known. 248 */ 249struct i2c_board_info { 250 char type[I2C_NAME_SIZE]; 251 unsigned short flags; 252 unsigned short addr; 253 void *platform_data; 254 struct dev_archdata *archdata; 255#ifdef CONFIG_OF 256 struct device_node *of_node; 257#endif 258 int irq; 259}; 260 261/** 262 * I2C_BOARD_INFO - macro used to list an i2c device and its address 263 * @dev_type: identifies the device type 264 * @dev_addr: the device's address on the bus. 265 * 266 * This macro initializes essential fields of a struct i2c_board_info, 267 * declaring what has been provided on a particular board. Optional 268 * fields (such as associated irq, or device-specific platform_data) 269 * are provided using conventional syntax. 270 */ 271#define I2C_BOARD_INFO(dev_type, dev_addr) \ 272 .type = dev_type, .addr = (dev_addr) 273 274 275#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) 276/* Add-on boards should register/unregister their devices; e.g. a board 277 * with integrated I2C, a config eeprom, sensors, and a codec that's 278 * used in conjunction with the primary hardware. 279 */ 280extern struct i2c_client * 281i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info); 282 283/* If you don't know the exact address of an I2C device, use this variant 284 * instead, which can probe for device presence in a list of possible 285 * addresses. 286 */ 287extern struct i2c_client * 288i2c_new_probed_device(struct i2c_adapter *adap, 289 struct i2c_board_info *info, 290 unsigned short const *addr_list); 291 292/* For devices that use several addresses, use i2c_new_dummy() to make 293 * client handles for the extra addresses. 294 */ 295extern struct i2c_client * 296i2c_new_dummy(struct i2c_adapter *adap, u16 address); 297 298extern void i2c_unregister_device(struct i2c_client *); 299#endif /* I2C */ 300 301/* Mainboard arch_initcall() code should register all its I2C devices. 302 * This is done at arch_initcall time, before declaring any i2c adapters. 303 * Modules for add-on boards must use other calls. 304 */ 305#ifdef CONFIG_I2C_BOARDINFO 306extern int 307i2c_register_board_info(int busnum, struct i2c_board_info const *info, 308 unsigned n); 309#else 310static inline int 311i2c_register_board_info(int busnum, struct i2c_board_info const *info, 312 unsigned n) 313{ 314 return 0; 315} 316#endif /* I2C_BOARDINFO */ 317 318/* 319 * The following structs are for those who like to implement new bus drivers: 320 * i2c_algorithm is the interface to a class of hardware solutions which can 321 * be addressed using the same bus algorithms - i.e. bit-banging or the PCF8584 322 * to name two of the most common. 323 */ 324struct i2c_algorithm { 325 /* If an adapter algorithm can't do I2C-level access, set master_xfer 326 to NULL. If an adapter algorithm can do SMBus access, set 327 smbus_xfer. If set to NULL, the SMBus protocol is simulated 328 using common I2C messages */ 329 /* master_xfer should return the number of messages successfully 330 processed, or a negative value on error */ 331 int (*master_xfer)(struct i2c_adapter *adap, struct i2c_msg *msgs, 332 int num); 333 int (*smbus_xfer) (struct i2c_adapter *adap, u16 addr, 334 unsigned short flags, char read_write, 335 u8 command, int size, union i2c_smbus_data *data); 336 337 /* To determine what the adapter supports */ 338 u32 (*functionality) (struct i2c_adapter *); 339}; 340 341/* 342 * i2c_adapter is the structure used to identify a physical i2c bus along 343 * with the access algorithms necessary to access it. 344 */ 345struct i2c_adapter { 346 struct module *owner; 347 unsigned int id; 348 unsigned int class; /* classes to allow probing for */ 349 const struct i2c_algorithm *algo; /* the algorithm to access the bus */ 350 void *algo_data; 351 352 /* data fields that are valid for all devices */ 353 struct rt_mutex bus_lock; 354 355 int timeout; /* in jiffies */ 356 int retries; 357 struct device dev; /* the adapter device */ 358 359 int nr; 360 char name[48]; 361 struct completion dev_released; 362 363 struct list_head userspace_clients; 364}; 365#define to_i2c_adapter(d) container_of(d, struct i2c_adapter, dev) 366 367static inline void *i2c_get_adapdata(const struct i2c_adapter *dev) 368{ 369 return dev_get_drvdata(&dev->dev); 370} 371 372static inline void i2c_set_adapdata(struct i2c_adapter *dev, void *data) 373{ 374 dev_set_drvdata(&dev->dev, data); 375} 376 377/** 378 * i2c_lock_adapter - Prevent access to an I2C bus segment 379 * @adapter: Target I2C bus segment 380 */ 381static inline void i2c_lock_adapter(struct i2c_adapter *adapter) 382{ 383 rt_mutex_lock(&adapter->bus_lock); 384} 385 386/** 387 * i2c_unlock_adapter - Reauthorize access to an I2C bus segment 388 * @adapter: Target I2C bus segment 389 */ 390static inline void i2c_unlock_adapter(struct i2c_adapter *adapter) 391{ 392 rt_mutex_unlock(&adapter->bus_lock); 393} 394 395/*flags for the client struct: */ 396#define I2C_CLIENT_PEC 0x04 /* Use Packet Error Checking */ 397#define I2C_CLIENT_TEN 0x10 /* we have a ten bit chip address */ 398 /* Must equal I2C_M_TEN below */ 399#define I2C_CLIENT_WAKE 0x80 /* for board_info; true iff can wake */ 400 401/* i2c adapter classes (bitmask) */ 402#define I2C_CLASS_HWMON (1<<0) /* lm_sensors, ... */ 403#define I2C_CLASS_TV_ANALOG (1<<1) /* bttv + friends */ 404#define I2C_CLASS_TV_DIGITAL (1<<2) /* dvb cards */ 405#define I2C_CLASS_DDC (1<<3) /* DDC bus on graphics adapters */ 406#define I2C_CLASS_SPD (1<<7) /* SPD EEPROMs and similar */ 407 408/* Internal numbers to terminate lists */ 409#define I2C_CLIENT_END 0xfffeU 410 411/* The numbers to use to set I2C bus address */ 412#define ANY_I2C_BUS 0xffff 413 414/* Construct an I2C_CLIENT_END-terminated array of i2c addresses */ 415#define I2C_ADDRS(addr, addrs...) \ 416 ((const unsigned short []){ addr, ## addrs, I2C_CLIENT_END }) 417 418 419/* ----- functions exported by i2c.o */ 420 421/* administration... 422 */ 423#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) 424extern int i2c_add_adapter(struct i2c_adapter *); 425extern int i2c_del_adapter(struct i2c_adapter *); 426extern int i2c_add_numbered_adapter(struct i2c_adapter *); 427 428extern int i2c_register_driver(struct module *, struct i2c_driver *); 429extern void i2c_del_driver(struct i2c_driver *); 430 431static inline int i2c_add_driver(struct i2c_driver *driver) 432{ 433 return i2c_register_driver(THIS_MODULE, driver); 434} 435 436extern struct i2c_client *i2c_use_client(struct i2c_client *client); 437extern void i2c_release_client(struct i2c_client *client); 438 439/* call the i2c_client->command() of all attached clients with 440 * the given arguments */ 441extern void i2c_clients_command(struct i2c_adapter *adap, 442 unsigned int cmd, void *arg); 443 444extern struct i2c_adapter *i2c_get_adapter(int id); 445extern void i2c_put_adapter(struct i2c_adapter *adap); 446 447 448/* Return the functionality mask */ 449static inline u32 i2c_get_functionality(struct i2c_adapter *adap) 450{ 451 return adap->algo->functionality(adap); 452} 453 454/* Return 1 if adapter supports everything we need, 0 if not. */ 455static inline int i2c_check_functionality(struct i2c_adapter *adap, u32 func) 456{ 457 return (func & i2c_get_functionality(adap)) == func; 458} 459 460/* Return the adapter number for a specific adapter */ 461static inline int i2c_adapter_id(struct i2c_adapter *adap) 462{ 463 return adap->nr; 464} 465#endif /* I2C */ 466#endif /* __KERNEL__ */ 467 468/** 469 * struct i2c_msg - an I2C transaction segment beginning with START 470 * @addr: Slave address, either seven or ten bits. When this is a ten 471 * bit address, I2C_M_TEN must be set in @flags and the adapter 472 * must support I2C_FUNC_10BIT_ADDR. 473 * @flags: I2C_M_RD is handled by all adapters. No other flags may be 474 * provided unless the adapter exported the relevant I2C_FUNC_* 475 * flags through i2c_check_functionality(). 476 * @len: Number of data bytes in @buf being read from or written to the 477 * I2C slave address. For read transactions where I2C_M_RECV_LEN 478 * is set, the caller guarantees that this buffer can hold up to 479 * 32 bytes in addition to the initial length byte sent by the 480 * slave (plus, if used, the SMBus PEC); and this value will be 481 * incremented by the number of block data bytes received. 482 * @buf: The buffer into which data is read, or from which it's written. 483 * 484 * An i2c_msg is the low level representation of one segment of an I2C 485 * transaction. It is visible to drivers in the @i2c_transfer() procedure, 486 * to userspace from i2c-dev, and to I2C adapter drivers through the 487 * @i2c_adapter.@master_xfer() method. 488 * 489 * Except when I2C "protocol mangling" is used, all I2C adapters implement 490 * the standard rules for I2C transactions. Each transaction begins with a 491 * START. That is followed by the slave address, and a bit encoding read 492 * versus write. Then follow all the data bytes, possibly including a byte 493 * with SMBus PEC. The transfer terminates with a NAK, or when all those 494 * bytes have been transferred and ACKed. If this is the last message in a 495 * group, it is followed by a STOP. Otherwise it is followed by the next 496 * @i2c_msg transaction segment, beginning with a (repeated) START. 497 * 498 * Alternatively, when the adapter supports I2C_FUNC_PROTOCOL_MANGLING then 499 * passing certain @flags may have changed those standard protocol behaviors. 500 * Those flags are only for use with broken/nonconforming slaves, and with 501 * adapters which are known to support the specific mangling options they 502 * need (one or more of IGNORE_NAK, NO_RD_ACK, NOSTART, and REV_DIR_ADDR). 503 */ 504struct i2c_msg { 505 __u16 addr; /* slave address */ 506 __u16 flags; 507#define I2C_M_TEN 0x0010 /* this is a ten bit chip address */ 508#define I2C_M_RD 0x0001 /* read data, from slave to master */ 509#define I2C_M_NOSTART 0x4000 /* if I2C_FUNC_PROTOCOL_MANGLING */ 510#define I2C_M_REV_DIR_ADDR 0x2000 /* if I2C_FUNC_PROTOCOL_MANGLING */ 511#define I2C_M_IGNORE_NAK 0x1000 /* if I2C_FUNC_PROTOCOL_MANGLING */ 512#define I2C_M_NO_RD_ACK 0x0800 /* if I2C_FUNC_PROTOCOL_MANGLING */ 513#define I2C_M_RECV_LEN 0x0400 /* length will be first received byte */ 514 __u16 len; /* msg length */ 515 __u8 *buf; /* pointer to msg data */ 516}; 517 518/* To determine what functionality is present */ 519 520#define I2C_FUNC_I2C 0x00000001 521#define I2C_FUNC_10BIT_ADDR 0x00000002 522#define I2C_FUNC_PROTOCOL_MANGLING 0x00000004 /* I2C_M_NOSTART etc. */ 523#define I2C_FUNC_SMBUS_PEC 0x00000008 524#define I2C_FUNC_SMBUS_BLOCK_PROC_CALL 0x00008000 /* SMBus 2.0 */ 525#define I2C_FUNC_SMBUS_QUICK 0x00010000 526#define I2C_FUNC_SMBUS_READ_BYTE 0x00020000 527#define I2C_FUNC_SMBUS_WRITE_BYTE 0x00040000 528#define I2C_FUNC_SMBUS_READ_BYTE_DATA 0x00080000 529#define I2C_FUNC_SMBUS_WRITE_BYTE_DATA 0x00100000 530#define I2C_FUNC_SMBUS_READ_WORD_DATA 0x00200000 531#define I2C_FUNC_SMBUS_WRITE_WORD_DATA 0x00400000 532#define I2C_FUNC_SMBUS_PROC_CALL 0x00800000 533#define I2C_FUNC_SMBUS_READ_BLOCK_DATA 0x01000000 534#define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA 0x02000000 535#define I2C_FUNC_SMBUS_READ_I2C_BLOCK 0x04000000 /* I2C-like block xfer */ 536#define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK 0x08000000 /* w/ 1-byte reg. addr. */ 537 538#define I2C_FUNC_SMBUS_BYTE (I2C_FUNC_SMBUS_READ_BYTE | \ 539 I2C_FUNC_SMBUS_WRITE_BYTE) 540#define I2C_FUNC_SMBUS_BYTE_DATA (I2C_FUNC_SMBUS_READ_BYTE_DATA | \ 541 I2C_FUNC_SMBUS_WRITE_BYTE_DATA) 542#define I2C_FUNC_SMBUS_WORD_DATA (I2C_FUNC_SMBUS_READ_WORD_DATA | \ 543 I2C_FUNC_SMBUS_WRITE_WORD_DATA) 544#define I2C_FUNC_SMBUS_BLOCK_DATA (I2C_FUNC_SMBUS_READ_BLOCK_DATA | \ 545 I2C_FUNC_SMBUS_WRITE_BLOCK_DATA) 546#define I2C_FUNC_SMBUS_I2C_BLOCK (I2C_FUNC_SMBUS_READ_I2C_BLOCK | \ 547 I2C_FUNC_SMBUS_WRITE_I2C_BLOCK) 548 549#define I2C_FUNC_SMBUS_EMUL (I2C_FUNC_SMBUS_QUICK | \ 550 I2C_FUNC_SMBUS_BYTE | \ 551 I2C_FUNC_SMBUS_BYTE_DATA | \ 552 I2C_FUNC_SMBUS_WORD_DATA | \ 553 I2C_FUNC_SMBUS_PROC_CALL | \ 554 I2C_FUNC_SMBUS_WRITE_BLOCK_DATA | \ 555 I2C_FUNC_SMBUS_I2C_BLOCK | \ 556 I2C_FUNC_SMBUS_PEC) 557 558/* 559 * Data for SMBus Messages 560 */ 561#define I2C_SMBUS_BLOCK_MAX 32 /* As specified in SMBus standard */ 562union i2c_smbus_data { 563 __u8 byte; 564 __u16 word; 565 __u8 block[I2C_SMBUS_BLOCK_MAX + 2]; /* block[0] is used for length */ 566 /* and one more for user-space compatibility */ 567}; 568 569/* i2c_smbus_xfer read or write markers */ 570#define I2C_SMBUS_READ 1 571#define I2C_SMBUS_WRITE 0 572 573/* SMBus transaction types (size parameter in the above functions) 574 Note: these no longer correspond to the (arbitrary) PIIX4 internal codes! */ 575#define I2C_SMBUS_QUICK 0 576#define I2C_SMBUS_BYTE 1 577#define I2C_SMBUS_BYTE_DATA 2 578#define I2C_SMBUS_WORD_DATA 3 579#define I2C_SMBUS_PROC_CALL 4 580#define I2C_SMBUS_BLOCK_DATA 5 581#define I2C_SMBUS_I2C_BLOCK_BROKEN 6 582#define I2C_SMBUS_BLOCK_PROC_CALL 7 /* SMBus 2.0 */ 583#define I2C_SMBUS_I2C_BLOCK_DATA 8 584 585#endif /* _LINUX_I2C_H */ 586