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/mod_devicetable.h> 32#include <linux/device.h> /* for struct device */ 33#include <linux/sched.h> /* for completion */ 34#include <linux/mutex.h> 35#include <linux/of.h> /* for struct device_node */ 36#include <linux/swab.h> /* for swab16 */ 37 38extern struct bus_type i2c_bus_type; 39extern struct device_type i2c_adapter_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 51struct module; 52 53#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) 54/* 55 * The master routines are the ones normally used to transmit data to devices 56 * on a bus (or read from them). Apart from two basic transfer functions to 57 * transmit one message at a time, a more complex version can be used to 58 * transmit an arbitrary number of messages without interruption. 59 * @count must be be less than 64k since msg.len is u16. 60 */ 61extern int i2c_master_send(const struct i2c_client *client, const char *buf, 62 int count); 63extern int i2c_master_recv(const struct i2c_client *client, char *buf, 64 int count); 65 66/* Transfer num messages. 67 */ 68extern int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, 69 int num); 70 71/* This is the very generalized SMBus access routine. You probably do not 72 want to use this, though; one of the functions below may be much easier, 73 and probably just as fast. 74 Note that we use i2c_adapter here, because you do not need a specific 75 smbus adapter to call this function. */ 76extern s32 i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr, 77 unsigned short flags, char read_write, u8 command, 78 int size, union i2c_smbus_data *data); 79 80/* Now follow the 'nice' access routines. These also document the calling 81 conventions of i2c_smbus_xfer. */ 82 83extern s32 i2c_smbus_read_byte(const struct i2c_client *client); 84extern s32 i2c_smbus_write_byte(const struct i2c_client *client, u8 value); 85extern s32 i2c_smbus_read_byte_data(const struct i2c_client *client, 86 u8 command); 87extern s32 i2c_smbus_write_byte_data(const struct i2c_client *client, 88 u8 command, u8 value); 89extern s32 i2c_smbus_read_word_data(const struct i2c_client *client, 90 u8 command); 91extern s32 i2c_smbus_write_word_data(const struct i2c_client *client, 92 u8 command, u16 value); 93 94static inline s32 95i2c_smbus_read_word_swapped(const struct i2c_client *client, u8 command) 96{ 97 s32 value = i2c_smbus_read_word_data(client, command); 98 99 return (value < 0) ? value : swab16(value); 100} 101 102static inline s32 103i2c_smbus_write_word_swapped(const struct i2c_client *client, 104 u8 command, u16 value) 105{ 106 return i2c_smbus_write_word_data(client, command, swab16(value)); 107} 108 109/* Returns the number of read bytes */ 110extern s32 i2c_smbus_read_block_data(const struct i2c_client *client, 111 u8 command, u8 *values); 112extern s32 i2c_smbus_write_block_data(const struct i2c_client *client, 113 u8 command, u8 length, const u8 *values); 114/* Returns the number of read bytes */ 115extern s32 i2c_smbus_read_i2c_block_data(const struct i2c_client *client, 116 u8 command, u8 length, u8 *values); 117extern s32 i2c_smbus_write_i2c_block_data(const struct i2c_client *client, 118 u8 command, u8 length, 119 const u8 *values); 120#endif /* I2C */ 121 122/** 123 * struct i2c_driver - represent an I2C device driver 124 * @class: What kind of i2c device we instantiate (for detect) 125 * @attach_adapter: Callback for bus addition (deprecated) 126 * @detach_adapter: Callback for bus removal (deprecated) 127 * @probe: Callback for device binding 128 * @remove: Callback for device unbinding 129 * @shutdown: Callback for device shutdown 130 * @suspend: Callback for device suspend 131 * @resume: Callback for device resume 132 * @alert: Alert callback, for example for the SMBus alert protocol 133 * @command: Callback for bus-wide signaling (optional) 134 * @driver: Device driver model driver 135 * @id_table: List of I2C devices supported by this driver 136 * @detect: Callback for device detection 137 * @address_list: The I2C addresses to probe (for detect) 138 * @clients: List of detected clients we created (for i2c-core use only) 139 * 140 * The driver.owner field should be set to the module owner of this driver. 141 * The driver.name field should be set to the name of this driver. 142 * 143 * For automatic device detection, both @detect and @address_data must 144 * be defined. @class should also be set, otherwise only devices forced 145 * with module parameters will be created. The detect function must 146 * fill at least the name field of the i2c_board_info structure it is 147 * handed upon successful detection, and possibly also the flags field. 148 * 149 * If @detect is missing, the driver will still work fine for enumerated 150 * devices. Detected devices simply won't be supported. This is expected 151 * for the many I2C/SMBus devices which can't be detected reliably, and 152 * the ones which can always be enumerated in practice. 153 * 154 * The i2c_client structure which is handed to the @detect callback is 155 * not a real i2c_client. It is initialized just enough so that you can 156 * call i2c_smbus_read_byte_data and friends on it. Don't do anything 157 * else with it. In particular, calling dev_dbg and friends on it is 158 * not allowed. 159 */ 160struct i2c_driver { 161 unsigned int class; 162 163 /* Notifies the driver that a new bus has appeared or is about to be 164 * removed. You should avoid using this, it will be removed in a 165 * near future. 166 */ 167 int (*attach_adapter)(struct i2c_adapter *) __deprecated; 168 int (*detach_adapter)(struct i2c_adapter *) __deprecated; 169 170 /* Standard driver model interfaces */ 171 int (*probe)(struct i2c_client *, const struct i2c_device_id *); 172 int (*remove)(struct i2c_client *); 173 174 /* driver model interfaces that don't relate to enumeration */ 175 void (*shutdown)(struct i2c_client *); 176 int (*suspend)(struct i2c_client *, pm_message_t mesg); 177 int (*resume)(struct i2c_client *); 178 179 /* Alert callback, for example for the SMBus alert protocol. 180 * The format and meaning of the data value depends on the protocol. 181 * For the SMBus alert protocol, there is a single bit of data passed 182 * as the alert response's low bit ("event flag"). 183 */ 184 void (*alert)(struct i2c_client *, unsigned int data); 185 186 /* a ioctl like command that can be used to perform specific functions 187 * with the device. 188 */ 189 int (*command)(struct i2c_client *client, unsigned int cmd, void *arg); 190 191 struct device_driver driver; 192 const struct i2c_device_id *id_table; 193 194 /* Device detection callback for automatic device creation */ 195 int (*detect)(struct i2c_client *, struct i2c_board_info *); 196 const unsigned short *address_list; 197 struct list_head clients; 198}; 199#define to_i2c_driver(d) container_of(d, struct i2c_driver, driver) 200 201/** 202 * struct i2c_client - represent an I2C slave device 203 * @flags: I2C_CLIENT_TEN indicates the device uses a ten bit chip address; 204 * I2C_CLIENT_PEC indicates it uses SMBus Packet Error Checking 205 * @addr: Address used on the I2C bus connected to the parent adapter. 206 * @name: Indicates the type of the device, usually a chip name that's 207 * generic enough to hide second-sourcing and compatible revisions. 208 * @adapter: manages the bus segment hosting this I2C device 209 * @driver: device's driver, hence pointer to access routines 210 * @dev: Driver model device node for the slave. 211 * @irq: indicates the IRQ generated by this device (if any) 212 * @detected: member of an i2c_driver.clients list or i2c-core's 213 * userspace_devices list 214 * 215 * An i2c_client identifies a single device (i.e. chip) connected to an 216 * i2c bus. The behaviour exposed to Linux is defined by the driver 217 * managing the device. 218 */ 219struct i2c_client { 220 unsigned short flags; /* div., see below */ 221 unsigned short addr; /* chip address - NOTE: 7bit */ 222 /* addresses are stored in the */ 223 /* _LOWER_ 7 bits */ 224 char name[I2C_NAME_SIZE]; 225 struct i2c_adapter *adapter; /* the adapter we sit on */ 226 struct i2c_driver *driver; /* and our access routines */ 227 struct device dev; /* the device structure */ 228 int irq; /* irq issued by device */ 229 struct list_head detected; 230}; 231#define to_i2c_client(d) container_of(d, struct i2c_client, dev) 232 233extern struct i2c_client *i2c_verify_client(struct device *dev); 234 235static inline struct i2c_client *kobj_to_i2c_client(struct kobject *kobj) 236{ 237 struct device * const dev = container_of(kobj, struct device, kobj); 238 return to_i2c_client(dev); 239} 240 241static inline void *i2c_get_clientdata(const struct i2c_client *dev) 242{ 243 return dev_get_drvdata(&dev->dev); 244} 245 246static inline void i2c_set_clientdata(struct i2c_client *dev, void *data) 247{ 248 dev_set_drvdata(&dev->dev, data); 249} 250 251/** 252 * struct i2c_board_info - template for device creation 253 * @type: chip type, to initialize i2c_client.name 254 * @flags: to initialize i2c_client.flags 255 * @addr: stored in i2c_client.addr 256 * @platform_data: stored in i2c_client.dev.platform_data 257 * @archdata: copied into i2c_client.dev.archdata 258 * @of_node: pointer to OpenFirmware device node 259 * @irq: stored in i2c_client.irq 260 * 261 * I2C doesn't actually support hardware probing, although controllers and 262 * devices may be able to use I2C_SMBUS_QUICK to tell whether or not there's 263 * a device at a given address. Drivers commonly need more information than 264 * that, such as chip type, configuration, associated IRQ, and so on. 265 * 266 * i2c_board_info is used to build tables of information listing I2C devices 267 * that are present. This information is used to grow the driver model tree. 268 * For mainboards this is done statically using i2c_register_board_info(); 269 * bus numbers identify adapters that aren't yet available. For add-on boards, 270 * i2c_new_device() does this dynamically with the adapter already known. 271 */ 272struct i2c_board_info { 273 char type[I2C_NAME_SIZE]; 274 unsigned short flags; 275 unsigned short addr; 276 void *platform_data; 277 struct dev_archdata *archdata; 278 struct device_node *of_node; 279 int irq; 280}; 281 282/** 283 * I2C_BOARD_INFO - macro used to list an i2c device and its address 284 * @dev_type: identifies the device type 285 * @dev_addr: the device's address on the bus. 286 * 287 * This macro initializes essential fields of a struct i2c_board_info, 288 * declaring what has been provided on a particular board. Optional 289 * fields (such as associated irq, or device-specific platform_data) 290 * are provided using conventional syntax. 291 */ 292#define I2C_BOARD_INFO(dev_type, dev_addr) \ 293 .type = dev_type, .addr = (dev_addr) 294 295 296#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) 297/* Add-on boards should register/unregister their devices; e.g. a board 298 * with integrated I2C, a config eeprom, sensors, and a codec that's 299 * used in conjunction with the primary hardware. 300 */ 301extern struct i2c_client * 302i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info); 303 304/* If you don't know the exact address of an I2C device, use this variant 305 * instead, which can probe for device presence in a list of possible 306 * addresses. The "probe" callback function is optional. If it is provided, 307 * it must return 1 on successful probe, 0 otherwise. If it is not provided, 308 * a default probing method is used. 309 */ 310extern struct i2c_client * 311i2c_new_probed_device(struct i2c_adapter *adap, 312 struct i2c_board_info *info, 313 unsigned short const *addr_list, 314 int (*probe)(struct i2c_adapter *, unsigned short addr)); 315 316/* Common custom probe functions */ 317extern int i2c_probe_func_quick_read(struct i2c_adapter *, unsigned short addr); 318 319/* For devices that use several addresses, use i2c_new_dummy() to make 320 * client handles for the extra addresses. 321 */ 322extern struct i2c_client * 323i2c_new_dummy(struct i2c_adapter *adap, u16 address); 324 325extern void i2c_unregister_device(struct i2c_client *); 326#endif /* I2C */ 327 328/* Mainboard arch_initcall() code should register all its I2C devices. 329 * This is done at arch_initcall time, before declaring any i2c adapters. 330 * Modules for add-on boards must use other calls. 331 */ 332#ifdef CONFIG_I2C_BOARDINFO 333extern int 334i2c_register_board_info(int busnum, struct i2c_board_info const *info, 335 unsigned n); 336#else 337static inline int 338i2c_register_board_info(int busnum, struct i2c_board_info const *info, 339 unsigned n) 340{ 341 return 0; 342} 343#endif /* I2C_BOARDINFO */ 344 345/* 346 * The following structs are for those who like to implement new bus drivers: 347 * i2c_algorithm is the interface to a class of hardware solutions which can 348 * be addressed using the same bus algorithms - i.e. bit-banging or the PCF8584 349 * to name two of the most common. 350 */ 351struct i2c_algorithm { 352 /* If an adapter algorithm can't do I2C-level access, set master_xfer 353 to NULL. If an adapter algorithm can do SMBus access, set 354 smbus_xfer. If set to NULL, the SMBus protocol is simulated 355 using common I2C messages */ 356 /* master_xfer should return the number of messages successfully 357 processed, or a negative value on error */ 358 int (*master_xfer)(struct i2c_adapter *adap, struct i2c_msg *msgs, 359 int num); 360 int (*smbus_xfer) (struct i2c_adapter *adap, u16 addr, 361 unsigned short flags, char read_write, 362 u8 command, int size, union i2c_smbus_data *data); 363 364 /* To determine what the adapter supports */ 365 u32 (*functionality) (struct i2c_adapter *); 366}; 367 368/* 369 * i2c_adapter is the structure used to identify a physical i2c bus along 370 * with the access algorithms necessary to access it. 371 */ 372struct i2c_adapter { 373 struct module *owner; 374 unsigned int class; /* classes to allow probing for */ 375 const struct i2c_algorithm *algo; /* the algorithm to access the bus */ 376 void *algo_data; 377 378 /* data fields that are valid for all devices */ 379 struct rt_mutex bus_lock; 380 381 int timeout; /* in jiffies */ 382 int retries; 383 struct device dev; /* the adapter device */ 384 385 int nr; 386 char name[48]; 387 struct completion dev_released; 388 389 struct mutex userspace_clients_lock; 390 struct list_head userspace_clients; 391}; 392#define to_i2c_adapter(d) container_of(d, struct i2c_adapter, dev) 393 394static inline void *i2c_get_adapdata(const struct i2c_adapter *dev) 395{ 396 return dev_get_drvdata(&dev->dev); 397} 398 399static inline void i2c_set_adapdata(struct i2c_adapter *dev, void *data) 400{ 401 dev_set_drvdata(&dev->dev, data); 402} 403 404static inline struct i2c_adapter * 405i2c_parent_is_i2c_adapter(const struct i2c_adapter *adapter) 406{ 407 struct device *parent = adapter->dev.parent; 408 409 if (parent != NULL && parent->type == &i2c_adapter_type) 410 return to_i2c_adapter(parent); 411 else 412 return NULL; 413} 414 415int i2c_for_each_dev(void *data, int (*fn)(struct device *, void *)); 416 417/* Adapter locking functions, exported for shared pin cases */ 418void i2c_lock_adapter(struct i2c_adapter *); 419void i2c_unlock_adapter(struct i2c_adapter *); 420 421/*flags for the client struct: */ 422#define I2C_CLIENT_PEC 0x04 /* Use Packet Error Checking */ 423#define I2C_CLIENT_TEN 0x10 /* we have a ten bit chip address */ 424 /* Must equal I2C_M_TEN below */ 425#define I2C_CLIENT_WAKE 0x80 /* for board_info; true iff can wake */ 426 427/* i2c adapter classes (bitmask) */ 428#define I2C_CLASS_HWMON (1<<0) /* lm_sensors, ... */ 429#define I2C_CLASS_DDC (1<<3) /* DDC bus on graphics adapters */ 430#define I2C_CLASS_SPD (1<<7) /* Memory modules */ 431 432/* Internal numbers to terminate lists */ 433#define I2C_CLIENT_END 0xfffeU 434 435/* Construct an I2C_CLIENT_END-terminated array of i2c addresses */ 436#define I2C_ADDRS(addr, addrs...) \ 437 ((const unsigned short []){ addr, ## addrs, I2C_CLIENT_END }) 438 439 440/* ----- functions exported by i2c.o */ 441 442/* administration... 443 */ 444#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) 445extern int i2c_add_adapter(struct i2c_adapter *); 446extern int i2c_del_adapter(struct i2c_adapter *); 447extern int i2c_add_numbered_adapter(struct i2c_adapter *); 448 449extern int i2c_register_driver(struct module *, struct i2c_driver *); 450extern void i2c_del_driver(struct i2c_driver *); 451 452/* use a define to avoid include chaining to get THIS_MODULE */ 453#define i2c_add_driver(driver) \ 454 i2c_register_driver(THIS_MODULE, driver) 455 456extern struct i2c_client *i2c_use_client(struct i2c_client *client); 457extern void i2c_release_client(struct i2c_client *client); 458 459/* call the i2c_client->command() of all attached clients with 460 * the given arguments */ 461extern void i2c_clients_command(struct i2c_adapter *adap, 462 unsigned int cmd, void *arg); 463 464extern struct i2c_adapter *i2c_get_adapter(int nr); 465extern void i2c_put_adapter(struct i2c_adapter *adap); 466 467 468/* Return the functionality mask */ 469static inline u32 i2c_get_functionality(struct i2c_adapter *adap) 470{ 471 return adap->algo->functionality(adap); 472} 473 474/* Return 1 if adapter supports everything we need, 0 if not. */ 475static inline int i2c_check_functionality(struct i2c_adapter *adap, u32 func) 476{ 477 return (func & i2c_get_functionality(adap)) == func; 478} 479 480/* Return the adapter number for a specific adapter */ 481static inline int i2c_adapter_id(struct i2c_adapter *adap) 482{ 483 return adap->nr; 484} 485 486/** 487 * module_i2c_driver() - Helper macro for registering a I2C driver 488 * @__i2c_driver: i2c_driver struct 489 * 490 * Helper macro for I2C drivers which do not do anything special in module 491 * init/exit. This eliminates a lot of boilerplate. Each module may only 492 * use this macro once, and calling it replaces module_init() and module_exit() 493 */ 494#define module_i2c_driver(__i2c_driver) \ 495 module_driver(__i2c_driver, i2c_add_driver, \ 496 i2c_del_driver) 497 498#endif /* I2C */ 499#endif /* __KERNEL__ */ 500 501/** 502 * struct i2c_msg - an I2C transaction segment beginning with START 503 * @addr: Slave address, either seven or ten bits. When this is a ten 504 * bit address, I2C_M_TEN must be set in @flags and the adapter 505 * must support I2C_FUNC_10BIT_ADDR. 506 * @flags: I2C_M_RD is handled by all adapters. No other flags may be 507 * provided unless the adapter exported the relevant I2C_FUNC_* 508 * flags through i2c_check_functionality(). 509 * @len: Number of data bytes in @buf being read from or written to the 510 * I2C slave address. For read transactions where I2C_M_RECV_LEN 511 * is set, the caller guarantees that this buffer can hold up to 512 * 32 bytes in addition to the initial length byte sent by the 513 * slave (plus, if used, the SMBus PEC); and this value will be 514 * incremented by the number of block data bytes received. 515 * @buf: The buffer into which data is read, or from which it's written. 516 * 517 * An i2c_msg is the low level representation of one segment of an I2C 518 * transaction. It is visible to drivers in the @i2c_transfer() procedure, 519 * to userspace from i2c-dev, and to I2C adapter drivers through the 520 * @i2c_adapter.@master_xfer() method. 521 * 522 * Except when I2C "protocol mangling" is used, all I2C adapters implement 523 * the standard rules for I2C transactions. Each transaction begins with a 524 * START. That is followed by the slave address, and a bit encoding read 525 * versus write. Then follow all the data bytes, possibly including a byte 526 * with SMBus PEC. The transfer terminates with a NAK, or when all those 527 * bytes have been transferred and ACKed. If this is the last message in a 528 * group, it is followed by a STOP. Otherwise it is followed by the next 529 * @i2c_msg transaction segment, beginning with a (repeated) START. 530 * 531 * Alternatively, when the adapter supports I2C_FUNC_PROTOCOL_MANGLING then 532 * passing certain @flags may have changed those standard protocol behaviors. 533 * Those flags are only for use with broken/nonconforming slaves, and with 534 * adapters which are known to support the specific mangling options they 535 * need (one or more of IGNORE_NAK, NO_RD_ACK, NOSTART, and REV_DIR_ADDR). 536 */ 537struct i2c_msg { 538 __u16 addr; /* slave address */ 539 __u16 flags; 540#define I2C_M_TEN 0x0010 /* this is a ten bit chip address */ 541#define I2C_M_RD 0x0001 /* read data, from slave to master */ 542#define I2C_M_NOSTART 0x4000 /* if I2C_FUNC_PROTOCOL_MANGLING */ 543#define I2C_M_REV_DIR_ADDR 0x2000 /* if I2C_FUNC_PROTOCOL_MANGLING */ 544#define I2C_M_IGNORE_NAK 0x1000 /* if I2C_FUNC_PROTOCOL_MANGLING */ 545#define I2C_M_NO_RD_ACK 0x0800 /* if I2C_FUNC_PROTOCOL_MANGLING */ 546#define I2C_M_RECV_LEN 0x0400 /* length will be first received byte */ 547 __u16 len; /* msg length */ 548 __u8 *buf; /* pointer to msg data */ 549}; 550 551/* To determine what functionality is present */ 552 553#define I2C_FUNC_I2C 0x00000001 554#define I2C_FUNC_10BIT_ADDR 0x00000002 555#define I2C_FUNC_PROTOCOL_MANGLING 0x00000004 /* I2C_M_NOSTART etc. */ 556#define I2C_FUNC_SMBUS_PEC 0x00000008 557#define I2C_FUNC_SMBUS_BLOCK_PROC_CALL 0x00008000 /* SMBus 2.0 */ 558#define I2C_FUNC_SMBUS_QUICK 0x00010000 559#define I2C_FUNC_SMBUS_READ_BYTE 0x00020000 560#define I2C_FUNC_SMBUS_WRITE_BYTE 0x00040000 561#define I2C_FUNC_SMBUS_READ_BYTE_DATA 0x00080000 562#define I2C_FUNC_SMBUS_WRITE_BYTE_DATA 0x00100000 563#define I2C_FUNC_SMBUS_READ_WORD_DATA 0x00200000 564#define I2C_FUNC_SMBUS_WRITE_WORD_DATA 0x00400000 565#define I2C_FUNC_SMBUS_PROC_CALL 0x00800000 566#define I2C_FUNC_SMBUS_READ_BLOCK_DATA 0x01000000 567#define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA 0x02000000 568#define I2C_FUNC_SMBUS_READ_I2C_BLOCK 0x04000000 /* I2C-like block xfer */ 569#define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK 0x08000000 /* w/ 1-byte reg. addr. */ 570 571#define I2C_FUNC_SMBUS_BYTE (I2C_FUNC_SMBUS_READ_BYTE | \ 572 I2C_FUNC_SMBUS_WRITE_BYTE) 573#define I2C_FUNC_SMBUS_BYTE_DATA (I2C_FUNC_SMBUS_READ_BYTE_DATA | \ 574 I2C_FUNC_SMBUS_WRITE_BYTE_DATA) 575#define I2C_FUNC_SMBUS_WORD_DATA (I2C_FUNC_SMBUS_READ_WORD_DATA | \ 576 I2C_FUNC_SMBUS_WRITE_WORD_DATA) 577#define I2C_FUNC_SMBUS_BLOCK_DATA (I2C_FUNC_SMBUS_READ_BLOCK_DATA | \ 578 I2C_FUNC_SMBUS_WRITE_BLOCK_DATA) 579#define I2C_FUNC_SMBUS_I2C_BLOCK (I2C_FUNC_SMBUS_READ_I2C_BLOCK | \ 580 I2C_FUNC_SMBUS_WRITE_I2C_BLOCK) 581 582#define I2C_FUNC_SMBUS_EMUL (I2C_FUNC_SMBUS_QUICK | \ 583 I2C_FUNC_SMBUS_BYTE | \ 584 I2C_FUNC_SMBUS_BYTE_DATA | \ 585 I2C_FUNC_SMBUS_WORD_DATA | \ 586 I2C_FUNC_SMBUS_PROC_CALL | \ 587 I2C_FUNC_SMBUS_WRITE_BLOCK_DATA | \ 588 I2C_FUNC_SMBUS_I2C_BLOCK | \ 589 I2C_FUNC_SMBUS_PEC) 590 591/* 592 * Data for SMBus Messages 593 */ 594#define I2C_SMBUS_BLOCK_MAX 32 /* As specified in SMBus standard */ 595union i2c_smbus_data { 596 __u8 byte; 597 __u16 word; 598 __u8 block[I2C_SMBUS_BLOCK_MAX + 2]; /* block[0] is used for length */ 599 /* and one more for user-space compatibility */ 600}; 601 602/* i2c_smbus_xfer read or write markers */ 603#define I2C_SMBUS_READ 1 604#define I2C_SMBUS_WRITE 0 605 606/* SMBus transaction types (size parameter in the above functions) 607 Note: these no longer correspond to the (arbitrary) PIIX4 internal codes! */ 608#define I2C_SMBUS_QUICK 0 609#define I2C_SMBUS_BYTE 1 610#define I2C_SMBUS_BYTE_DATA 2 611#define I2C_SMBUS_WORD_DATA 3 612#define I2C_SMBUS_PROC_CALL 4 613#define I2C_SMBUS_BLOCK_DATA 5 614#define I2C_SMBUS_I2C_BLOCK_BROKEN 6 615#define I2C_SMBUS_BLOCK_PROC_CALL 7 /* SMBus 2.0 */ 616#define I2C_SMBUS_I2C_BLOCK_DATA 8 617 618#endif /* _LINUX_I2C_H */ 619