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/mod_devicetable.h> 33 #include <linux/device.h> /* for struct device */ 34 #include <linux/sched.h> /* for completion */ 35 #include <linux/mutex.h> 36 #include <linux/of.h> /* for struct device_node */ 37 38 extern struct bus_type i2c_bus_type; 39 extern struct device_type i2c_adapter_type; 40 41 /* --- General options ------------------------------------------------ */ 42 43 struct i2c_msg; 44 struct i2c_algorithm; 45 struct i2c_adapter; 46 struct i2c_client; 47 struct i2c_driver; 48 union i2c_smbus_data; 49 struct 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 */ 59 extern int i2c_master_send(const struct i2c_client *client, const char *buf, 60 int count); 61 extern int i2c_master_recv(const struct i2c_client *client, char *buf, 62 int count); 63 64 /* Transfer num messages. 65 */ 66 extern int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, 67 int num); 68 69 /* This is the very generalized SMBus access routine. You probably do not 70 want to use this, though; one of the functions below may be much easier, 71 and probably just as fast. 72 Note that we use i2c_adapter here, because you do not need a specific 73 smbus adapter to call this function. */ 74 extern s32 i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr, 75 unsigned short flags, char read_write, u8 command, 76 int size, union i2c_smbus_data *data); 77 78 /* Now follow the 'nice' access routines. These also document the calling 79 conventions of i2c_smbus_xfer. */ 80 81 extern s32 i2c_smbus_read_byte(const struct i2c_client *client); 82 extern s32 i2c_smbus_write_byte(const struct i2c_client *client, u8 value); 83 extern s32 i2c_smbus_read_byte_data(const struct i2c_client *client, 84 u8 command); 85 extern s32 i2c_smbus_write_byte_data(const struct i2c_client *client, 86 u8 command, u8 value); 87 extern s32 i2c_smbus_read_word_data(const struct i2c_client *client, 88 u8 command); 89 extern s32 i2c_smbus_write_word_data(const struct i2c_client *client, 90 u8 command, u16 value); 91 /* Returns the number of read bytes */ 92 extern s32 i2c_smbus_read_block_data(const struct i2c_client *client, 93 u8 command, u8 *values); 94 extern s32 i2c_smbus_write_block_data(const struct i2c_client *client, 95 u8 command, u8 length, const u8 *values); 96 /* Returns the number of read bytes */ 97 extern s32 i2c_smbus_read_i2c_block_data(const struct i2c_client *client, 98 u8 command, u8 length, u8 *values); 99 extern s32 i2c_smbus_write_i2c_block_data(const struct i2c_client *client, 100 u8 command, u8 length, 101 const u8 *values); 102 #endif /* I2C */ 103 104 /** 105 * struct i2c_driver - represent an I2C device driver 106 * @class: What kind of i2c device we instantiate (for detect) 107 * @attach_adapter: Callback for bus addition (deprecated) 108 * @detach_adapter: Callback for bus removal (deprecated) 109 * @probe: Callback for device binding 110 * @remove: Callback for device unbinding 111 * @shutdown: Callback for device shutdown 112 * @suspend: Callback for device suspend 113 * @resume: Callback for device resume 114 * @alert: Alert callback, for example for the SMBus alert protocol 115 * @command: Callback for bus-wide signaling (optional) 116 * @driver: Device driver model driver 117 * @id_table: List of I2C devices supported by this driver 118 * @detect: Callback for device detection 119 * @address_list: The I2C addresses to probe (for detect) 120 * @clients: List of detected clients we created (for i2c-core use only) 121 * 122 * The driver.owner field should be set to the module owner of this driver. 123 * The driver.name field should be set to the name of this driver. 124 * 125 * For automatic device detection, both @detect and @address_data must 126 * be defined. @class should also be set, otherwise only devices forced 127 * with module parameters will be created. The detect function must 128 * fill at least the name field of the i2c_board_info structure it is 129 * handed upon successful detection, and possibly also the flags field. 130 * 131 * If @detect is missing, the driver will still work fine for enumerated 132 * devices. Detected devices simply won't be supported. This is expected 133 * for the many I2C/SMBus devices which can't be detected reliably, and 134 * the ones which can always be enumerated in practice. 135 * 136 * The i2c_client structure which is handed to the @detect callback is 137 * not a real i2c_client. It is initialized just enough so that you can 138 * call i2c_smbus_read_byte_data and friends on it. Don't do anything 139 * else with it. In particular, calling dev_dbg and friends on it is 140 * not allowed. 141 */ 142 struct i2c_driver { 143 unsigned int class; 144 145 /* Notifies the driver that a new bus has appeared or is about to be 146 * removed. You should avoid using this, it will be removed in a 147 * near future. 148 */ 149 int (*attach_adapter)(struct i2c_adapter *) __deprecated; 150 int (*detach_adapter)(struct i2c_adapter *) __deprecated; 151 152 /* Standard driver model interfaces */ 153 int (*probe)(struct i2c_client *, const struct i2c_device_id *); 154 int (*remove)(struct i2c_client *); 155 156 /* driver model interfaces that don't relate to enumeration */ 157 void (*shutdown)(struct i2c_client *); 158 int (*suspend)(struct i2c_client *, pm_message_t mesg); 159 int (*resume)(struct i2c_client *); 160 161 /* Alert callback, for example for the SMBus alert protocol. 162 * The format and meaning of the data value depends on the protocol. 163 * For the SMBus alert protocol, there is a single bit of data passed 164 * as the alert response's low bit ("event flag"). 165 */ 166 void (*alert)(struct i2c_client *, unsigned int data); 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 *, struct i2c_board_info *); 178 const unsigned short *address_list; 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 * @detected: member of an i2c_driver.clients list or i2c-core's 195 * userspace_devices list 196 * 197 * An i2c_client identifies a single device (i.e. chip) connected to an 198 * i2c bus. The behaviour exposed to Linux is defined by the driver 199 * managing the device. 200 */ 201 struct i2c_client { 202 unsigned short flags; /* div., see below */ 203 unsigned short addr; /* chip address - NOTE: 7bit */ 204 /* addresses are stored in the */ 205 /* _LOWER_ 7 bits */ 206 char name[I2C_NAME_SIZE]; 207 struct i2c_adapter *adapter; /* the adapter we sit on */ 208 struct i2c_driver *driver; /* and our access routines */ 209 struct device dev; /* the device structure */ 210 int irq; /* irq issued by device */ 211 struct list_head detected; 212 }; 213 #define to_i2c_client(d) container_of(d, struct i2c_client, dev) 214 215 extern struct i2c_client *i2c_verify_client(struct device *dev); 216 217 static inline struct i2c_client *kobj_to_i2c_client(struct kobject *kobj) 218 { 219 struct device * const dev = container_of(kobj, struct device, kobj); 220 return to_i2c_client(dev); 221 } 222 223 static inline void *i2c_get_clientdata(const struct i2c_client *dev) 224 { 225 return dev_get_drvdata(&dev->dev); 226 } 227 228 static inline void i2c_set_clientdata(struct i2c_client *dev, void *data) 229 { 230 dev_set_drvdata(&dev->dev, data); 231 } 232 233 /** 234 * struct i2c_board_info - template for device creation 235 * @type: chip type, to initialize i2c_client.name 236 * @flags: to initialize i2c_client.flags 237 * @addr: stored in i2c_client.addr 238 * @platform_data: stored in i2c_client.dev.platform_data 239 * @archdata: copied into i2c_client.dev.archdata 240 * @of_node: pointer to OpenFirmware device node 241 * @irq: stored in i2c_client.irq 242 * 243 * I2C doesn't actually support hardware probing, although controllers and 244 * devices may be able to use I2C_SMBUS_QUICK to tell whether or not there's 245 * a device at a given address. Drivers commonly need more information than 246 * that, such as chip type, configuration, associated IRQ, and so on. 247 * 248 * i2c_board_info is used to build tables of information listing I2C devices 249 * that are present. This information is used to grow the driver model tree. 250 * For mainboards this is done statically using i2c_register_board_info(); 251 * bus numbers identify adapters that aren't yet available. For add-on boards, 252 * i2c_new_device() does this dynamically with the adapter already known. 253 */ 254 struct i2c_board_info { 255 char type[I2C_NAME_SIZE]; 256 unsigned short flags; 257 unsigned short addr; 258 void *platform_data; 259 struct dev_archdata *archdata; 260 struct device_node *of_node; 261 int irq; 262 }; 263 264 /** 265 * I2C_BOARD_INFO - macro used to list an i2c device and its address 266 * @dev_type: identifies the device type 267 * @dev_addr: the device's address on the bus. 268 * 269 * This macro initializes essential fields of a struct i2c_board_info, 270 * declaring what has been provided on a particular board. Optional 271 * fields (such as associated irq, or device-specific platform_data) 272 * are provided using conventional syntax. 273 */ 274 #define I2C_BOARD_INFO(dev_type, dev_addr) \ 275 .type = dev_type, .addr = (dev_addr) 276 277 278 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) 279 /* Add-on boards should register/unregister their devices; e.g. a board 280 * with integrated I2C, a config eeprom, sensors, and a codec that's 281 * used in conjunction with the primary hardware. 282 */ 283 extern struct i2c_client * 284 i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info); 285 286 /* If you don't know the exact address of an I2C device, use this variant 287 * instead, which can probe for device presence in a list of possible 288 * addresses. The "probe" callback function is optional. If it is provided, 289 * it must return 1 on successful probe, 0 otherwise. If it is not provided, 290 * a default probing method is used. 291 */ 292 extern struct i2c_client * 293 i2c_new_probed_device(struct i2c_adapter *adap, 294 struct i2c_board_info *info, 295 unsigned short const *addr_list, 296 int (*probe)(struct i2c_adapter *, unsigned short addr)); 297 298 /* Common custom probe functions */ 299 extern int i2c_probe_func_quick_read(struct i2c_adapter *, unsigned short addr); 300 301 /* For devices that use several addresses, use i2c_new_dummy() to make 302 * client handles for the extra addresses. 303 */ 304 extern struct i2c_client * 305 i2c_new_dummy(struct i2c_adapter *adap, u16 address); 306 307 extern void i2c_unregister_device(struct i2c_client *); 308 #endif /* I2C */ 309 310 /* Mainboard arch_initcall() code should register all its I2C devices. 311 * This is done at arch_initcall time, before declaring any i2c adapters. 312 * Modules for add-on boards must use other calls. 313 */ 314 #ifdef CONFIG_I2C_BOARDINFO 315 extern int 316 i2c_register_board_info(int busnum, struct i2c_board_info const *info, 317 unsigned n); 318 #else 319 static inline int 320 i2c_register_board_info(int busnum, struct i2c_board_info const *info, 321 unsigned n) 322 { 323 return 0; 324 } 325 #endif /* I2C_BOARDINFO */ 326 327 /* 328 * The following structs are for those who like to implement new bus drivers: 329 * i2c_algorithm is the interface to a class of hardware solutions which can 330 * be addressed using the same bus algorithms - i.e. bit-banging or the PCF8584 331 * to name two of the most common. 332 */ 333 struct i2c_algorithm { 334 /* If an adapter algorithm can't do I2C-level access, set master_xfer 335 to NULL. If an adapter algorithm can do SMBus access, set 336 smbus_xfer. If set to NULL, the SMBus protocol is simulated 337 using common I2C messages */ 338 /* master_xfer should return the number of messages successfully 339 processed, or a negative value on error */ 340 int (*master_xfer)(struct i2c_adapter *adap, struct i2c_msg *msgs, 341 int num); 342 int (*smbus_xfer) (struct i2c_adapter *adap, u16 addr, 343 unsigned short flags, char read_write, 344 u8 command, int size, union i2c_smbus_data *data); 345 346 /* To determine what the adapter supports */ 347 u32 (*functionality) (struct i2c_adapter *); 348 }; 349 350 /* 351 * i2c_adapter is the structure used to identify a physical i2c bus along 352 * with the access algorithms necessary to access it. 353 */ 354 struct i2c_adapter { 355 struct module *owner; 356 unsigned int class; /* classes to allow probing for */ 357 const struct i2c_algorithm *algo; /* the algorithm to access the bus */ 358 void *algo_data; 359 360 /* data fields that are valid for all devices */ 361 struct rt_mutex bus_lock; 362 363 int timeout; /* in jiffies */ 364 int retries; 365 struct device dev; /* the adapter device */ 366 367 int nr; 368 char name[48]; 369 struct completion dev_released; 370 371 struct mutex userspace_clients_lock; 372 struct list_head userspace_clients; 373 }; 374 #define to_i2c_adapter(d) container_of(d, struct i2c_adapter, dev) 375 376 static inline void *i2c_get_adapdata(const struct i2c_adapter *dev) 377 { 378 return dev_get_drvdata(&dev->dev); 379 } 380 381 static inline void i2c_set_adapdata(struct i2c_adapter *dev, void *data) 382 { 383 dev_set_drvdata(&dev->dev, data); 384 } 385 386 static inline struct i2c_adapter * 387 i2c_parent_is_i2c_adapter(const struct i2c_adapter *adapter) 388 { 389 struct device *parent = adapter->dev.parent; 390 391 if (parent != NULL && parent->type == &i2c_adapter_type) 392 return to_i2c_adapter(parent); 393 else 394 return NULL; 395 } 396 397 int i2c_for_each_dev(void *data, int (*fn)(struct device *, void *)); 398 399 /* Adapter locking functions, exported for shared pin cases */ 400 void i2c_lock_adapter(struct i2c_adapter *); 401 void i2c_unlock_adapter(struct i2c_adapter *); 402 403 /*flags for the client struct: */ 404 #define I2C_CLIENT_PEC 0x04 /* Use Packet Error Checking */ 405 #define I2C_CLIENT_TEN 0x10 /* we have a ten bit chip address */ 406 /* Must equal I2C_M_TEN below */ 407 #define I2C_CLIENT_WAKE 0x80 /* for board_info; true iff can wake */ 408 409 /* i2c adapter classes (bitmask) */ 410 #define I2C_CLASS_HWMON (1<<0) /* lm_sensors, ... */ 411 #define I2C_CLASS_DDC (1<<3) /* DDC bus on graphics adapters */ 412 #define I2C_CLASS_SPD (1<<7) /* SPD EEPROMs and similar */ 413 414 /* Internal numbers to terminate lists */ 415 #define I2C_CLIENT_END 0xfffeU 416 417 /* The numbers to use to set I2C bus address */ 418 #define ANY_I2C_BUS 0xffff 419 420 /* Construct an I2C_CLIENT_END-terminated array of i2c addresses */ 421 #define I2C_ADDRS(addr, addrs...) \ 422 ((const unsigned short []){ addr, ## addrs, I2C_CLIENT_END }) 423 424 425 /* ----- functions exported by i2c.o */ 426 427 /* administration... 428 */ 429 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) 430 extern int i2c_add_adapter(struct i2c_adapter *); 431 extern int i2c_del_adapter(struct i2c_adapter *); 432 extern int i2c_add_numbered_adapter(struct i2c_adapter *); 433 434 extern int i2c_register_driver(struct module *, struct i2c_driver *); 435 extern void i2c_del_driver(struct i2c_driver *); 436 437 static inline int i2c_add_driver(struct i2c_driver *driver) 438 { 439 return i2c_register_driver(THIS_MODULE, driver); 440 } 441 442 extern struct i2c_client *i2c_use_client(struct i2c_client *client); 443 extern void i2c_release_client(struct i2c_client *client); 444 445 /* call the i2c_client->command() of all attached clients with 446 * the given arguments */ 447 extern void i2c_clients_command(struct i2c_adapter *adap, 448 unsigned int cmd, void *arg); 449 450 extern struct i2c_adapter *i2c_get_adapter(int nr); 451 extern void i2c_put_adapter(struct i2c_adapter *adap); 452 453 454 /* Return the functionality mask */ 455 static inline u32 i2c_get_functionality(struct i2c_adapter *adap) 456 { 457 return adap->algo->functionality(adap); 458 } 459 460 /* Return 1 if adapter supports everything we need, 0 if not. */ 461 static inline int i2c_check_functionality(struct i2c_adapter *adap, u32 func) 462 { 463 return (func & i2c_get_functionality(adap)) == func; 464 } 465 466 /* Return the adapter number for a specific adapter */ 467 static inline int i2c_adapter_id(struct i2c_adapter *adap) 468 { 469 return adap->nr; 470 } 471 #endif /* I2C */ 472 #endif /* __KERNEL__ */ 473 474 /** 475 * struct i2c_msg - an I2C transaction segment beginning with START 476 * @addr: Slave address, either seven or ten bits. When this is a ten 477 * bit address, I2C_M_TEN must be set in @flags and the adapter 478 * must support I2C_FUNC_10BIT_ADDR. 479 * @flags: I2C_M_RD is handled by all adapters. No other flags may be 480 * provided unless the adapter exported the relevant I2C_FUNC_* 481 * flags through i2c_check_functionality(). 482 * @len: Number of data bytes in @buf being read from or written to the 483 * I2C slave address. For read transactions where I2C_M_RECV_LEN 484 * is set, the caller guarantees that this buffer can hold up to 485 * 32 bytes in addition to the initial length byte sent by the 486 * slave (plus, if used, the SMBus PEC); and this value will be 487 * incremented by the number of block data bytes received. 488 * @buf: The buffer into which data is read, or from which it's written. 489 * 490 * An i2c_msg is the low level representation of one segment of an I2C 491 * transaction. It is visible to drivers in the @i2c_transfer() procedure, 492 * to userspace from i2c-dev, and to I2C adapter drivers through the 493 * @i2c_adapter.@master_xfer() method. 494 * 495 * Except when I2C "protocol mangling" is used, all I2C adapters implement 496 * the standard rules for I2C transactions. Each transaction begins with a 497 * START. That is followed by the slave address, and a bit encoding read 498 * versus write. Then follow all the data bytes, possibly including a byte 499 * with SMBus PEC. The transfer terminates with a NAK, or when all those 500 * bytes have been transferred and ACKed. If this is the last message in a 501 * group, it is followed by a STOP. Otherwise it is followed by the next 502 * @i2c_msg transaction segment, beginning with a (repeated) START. 503 * 504 * Alternatively, when the adapter supports I2C_FUNC_PROTOCOL_MANGLING then 505 * passing certain @flags may have changed those standard protocol behaviors. 506 * Those flags are only for use with broken/nonconforming slaves, and with 507 * adapters which are known to support the specific mangling options they 508 * need (one or more of IGNORE_NAK, NO_RD_ACK, NOSTART, and REV_DIR_ADDR). 509 */ 510 struct i2c_msg { 511 __u16 addr; /* slave address */ 512 __u16 flags; 513 #define I2C_M_TEN 0x0010 /* this is a ten bit chip address */ 514 #define I2C_M_RD 0x0001 /* read data, from slave to master */ 515 #define I2C_M_NOSTART 0x4000 /* if I2C_FUNC_PROTOCOL_MANGLING */ 516 #define I2C_M_REV_DIR_ADDR 0x2000 /* if I2C_FUNC_PROTOCOL_MANGLING */ 517 #define I2C_M_IGNORE_NAK 0x1000 /* if I2C_FUNC_PROTOCOL_MANGLING */ 518 #define I2C_M_NO_RD_ACK 0x0800 /* if I2C_FUNC_PROTOCOL_MANGLING */ 519 #define I2C_M_RECV_LEN 0x0400 /* length will be first received byte */ 520 __u16 len; /* msg length */ 521 __u8 *buf; /* pointer to msg data */ 522 }; 523 524 /* To determine what functionality is present */ 525 526 #define I2C_FUNC_I2C 0x00000001 527 #define I2C_FUNC_10BIT_ADDR 0x00000002 528 #define I2C_FUNC_PROTOCOL_MANGLING 0x00000004 /* I2C_M_NOSTART etc. */ 529 #define I2C_FUNC_SMBUS_PEC 0x00000008 530 #define I2C_FUNC_SMBUS_BLOCK_PROC_CALL 0x00008000 /* SMBus 2.0 */ 531 #define I2C_FUNC_SMBUS_QUICK 0x00010000 532 #define I2C_FUNC_SMBUS_READ_BYTE 0x00020000 533 #define I2C_FUNC_SMBUS_WRITE_BYTE 0x00040000 534 #define I2C_FUNC_SMBUS_READ_BYTE_DATA 0x00080000 535 #define I2C_FUNC_SMBUS_WRITE_BYTE_DATA 0x00100000 536 #define I2C_FUNC_SMBUS_READ_WORD_DATA 0x00200000 537 #define I2C_FUNC_SMBUS_WRITE_WORD_DATA 0x00400000 538 #define I2C_FUNC_SMBUS_PROC_CALL 0x00800000 539 #define I2C_FUNC_SMBUS_READ_BLOCK_DATA 0x01000000 540 #define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA 0x02000000 541 #define I2C_FUNC_SMBUS_READ_I2C_BLOCK 0x04000000 /* I2C-like block xfer */ 542 #define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK 0x08000000 /* w/ 1-byte reg. addr. */ 543 544 #define I2C_FUNC_SMBUS_BYTE (I2C_FUNC_SMBUS_READ_BYTE | \ 545 I2C_FUNC_SMBUS_WRITE_BYTE) 546 #define I2C_FUNC_SMBUS_BYTE_DATA (I2C_FUNC_SMBUS_READ_BYTE_DATA | \ 547 I2C_FUNC_SMBUS_WRITE_BYTE_DATA) 548 #define I2C_FUNC_SMBUS_WORD_DATA (I2C_FUNC_SMBUS_READ_WORD_DATA | \ 549 I2C_FUNC_SMBUS_WRITE_WORD_DATA) 550 #define I2C_FUNC_SMBUS_BLOCK_DATA (I2C_FUNC_SMBUS_READ_BLOCK_DATA | \ 551 I2C_FUNC_SMBUS_WRITE_BLOCK_DATA) 552 #define I2C_FUNC_SMBUS_I2C_BLOCK (I2C_FUNC_SMBUS_READ_I2C_BLOCK | \ 553 I2C_FUNC_SMBUS_WRITE_I2C_BLOCK) 554 555 #define I2C_FUNC_SMBUS_EMUL (I2C_FUNC_SMBUS_QUICK | \ 556 I2C_FUNC_SMBUS_BYTE | \ 557 I2C_FUNC_SMBUS_BYTE_DATA | \ 558 I2C_FUNC_SMBUS_WORD_DATA | \ 559 I2C_FUNC_SMBUS_PROC_CALL | \ 560 I2C_FUNC_SMBUS_WRITE_BLOCK_DATA | \ 561 I2C_FUNC_SMBUS_I2C_BLOCK | \ 562 I2C_FUNC_SMBUS_PEC) 563 564 /* 565 * Data for SMBus Messages 566 */ 567 #define I2C_SMBUS_BLOCK_MAX 32 /* As specified in SMBus standard */ 568 union i2c_smbus_data { 569 __u8 byte; 570 __u16 word; 571 __u8 block[I2C_SMBUS_BLOCK_MAX + 2]; /* block[0] is used for length */ 572 /* and one more for user-space compatibility */ 573 }; 574 575 /* i2c_smbus_xfer read or write markers */ 576 #define I2C_SMBUS_READ 1 577 #define I2C_SMBUS_WRITE 0 578 579 /* SMBus transaction types (size parameter in the above functions) 580 Note: these no longer correspond to the (arbitrary) PIIX4 internal codes! */ 581 #define I2C_SMBUS_QUICK 0 582 #define I2C_SMBUS_BYTE 1 583 #define I2C_SMBUS_BYTE_DATA 2 584 #define I2C_SMBUS_WORD_DATA 3 585 #define I2C_SMBUS_PROC_CALL 4 586 #define I2C_SMBUS_BLOCK_DATA 5 587 #define I2C_SMBUS_I2C_BLOCK_BROKEN 6 588 #define I2C_SMBUS_BLOCK_PROC_CALL 7 /* SMBus 2.0 */ 589 #define I2C_SMBUS_I2C_BLOCK_DATA 8 590 591 #endif /* _LINUX_I2C_H */ 592