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 <[email protected]> and 24 Frodo Looijaard <[email protected]> */ 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 #include <linux/swab.h> /* for swab16 */ 38 39 extern struct bus_type i2c_bus_type; 40 extern struct device_type i2c_adapter_type; 41 42 /* --- General options ------------------------------------------------ */ 43 44 struct i2c_msg; 45 struct i2c_algorithm; 46 struct i2c_adapter; 47 struct i2c_client; 48 struct i2c_driver; 49 union i2c_smbus_data; 50 struct i2c_board_info; 51 52 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) 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 * @count must be be less than 64k since msg.len is u16. 59 */ 60 extern int i2c_master_send(const struct i2c_client *client, const char *buf, 61 int count); 62 extern int i2c_master_recv(const struct i2c_client *client, char *buf, 63 int count); 64 65 /* Transfer num messages. 66 */ 67 extern int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, 68 int num); 69 70 /* This is the very generalized SMBus access routine. You probably do not 71 want to use this, though; one of the functions below may be much easier, 72 and probably just as fast. 73 Note that we use i2c_adapter here, because you do not need a specific 74 smbus adapter to call this function. */ 75 extern s32 i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr, 76 unsigned short flags, char read_write, u8 command, 77 int size, union i2c_smbus_data *data); 78 79 /* Now follow the 'nice' access routines. These also document the calling 80 conventions of i2c_smbus_xfer. */ 81 82 extern s32 i2c_smbus_read_byte(const struct i2c_client *client); 83 extern s32 i2c_smbus_write_byte(const struct i2c_client *client, u8 value); 84 extern s32 i2c_smbus_read_byte_data(const struct i2c_client *client, 85 u8 command); 86 extern s32 i2c_smbus_write_byte_data(const struct i2c_client *client, 87 u8 command, u8 value); 88 extern s32 i2c_smbus_read_word_data(const struct i2c_client *client, 89 u8 command); 90 extern s32 i2c_smbus_write_word_data(const struct i2c_client *client, 91 u8 command, u16 value); 92 93 static inline s32 94 i2c_smbus_read_word_swapped(const struct i2c_client *client, u8 command) 95 { 96 s32 value = i2c_smbus_read_word_data(client, command); 97 98 return (value < 0) ? value : swab16(value); 99 } 100 101 static inline s32 102 i2c_smbus_write_word_swapped(const struct i2c_client *client, 103 u8 command, u16 value) 104 { 105 return i2c_smbus_write_word_data(client, command, swab16(value)); 106 } 107 108 /* Returns the number of read bytes */ 109 extern s32 i2c_smbus_read_block_data(const struct i2c_client *client, 110 u8 command, u8 *values); 111 extern s32 i2c_smbus_write_block_data(const struct i2c_client *client, 112 u8 command, u8 length, const u8 *values); 113 /* Returns the number of read bytes */ 114 extern s32 i2c_smbus_read_i2c_block_data(const struct i2c_client *client, 115 u8 command, u8 length, u8 *values); 116 extern s32 i2c_smbus_write_i2c_block_data(const struct i2c_client *client, 117 u8 command, u8 length, 118 const u8 *values); 119 #endif /* I2C */ 120 121 /** 122 * struct i2c_driver - represent an I2C device driver 123 * @class: What kind of i2c device we instantiate (for detect) 124 * @attach_adapter: Callback for bus addition (deprecated) 125 * @detach_adapter: Callback for bus removal (deprecated) 126 * @probe: Callback for device binding 127 * @remove: Callback for device unbinding 128 * @shutdown: Callback for device shutdown 129 * @suspend: Callback for device suspend 130 * @resume: Callback for device resume 131 * @alert: Alert callback, for example for the SMBus alert protocol 132 * @command: Callback for bus-wide signaling (optional) 133 * @driver: Device driver model driver 134 * @id_table: List of I2C devices supported by this driver 135 * @detect: Callback for device detection 136 * @address_list: The I2C addresses to probe (for detect) 137 * @clients: List of detected clients we created (for i2c-core use only) 138 * 139 * The driver.owner field should be set to the module owner of this driver. 140 * The driver.name field should be set to the name of this driver. 141 * 142 * For automatic device detection, both @detect and @address_data must 143 * be defined. @class should also be set, otherwise only devices forced 144 * with module parameters will be created. The detect function must 145 * fill at least the name field of the i2c_board_info structure it is 146 * handed upon successful detection, and possibly also the flags field. 147 * 148 * If @detect is missing, the driver will still work fine for enumerated 149 * devices. Detected devices simply won't be supported. This is expected 150 * for the many I2C/SMBus devices which can't be detected reliably, and 151 * the ones which can always be enumerated in practice. 152 * 153 * The i2c_client structure which is handed to the @detect callback is 154 * not a real i2c_client. It is initialized just enough so that you can 155 * call i2c_smbus_read_byte_data and friends on it. Don't do anything 156 * else with it. In particular, calling dev_dbg and friends on it is 157 * not allowed. 158 */ 159 struct i2c_driver { 160 unsigned int class; 161 162 /* Notifies the driver that a new bus has appeared or is about to be 163 * removed. You should avoid using this, it will be removed in a 164 * near future. 165 */ 166 int (*attach_adapter)(struct i2c_adapter *) __deprecated; 167 int (*detach_adapter)(struct i2c_adapter *) __deprecated; 168 169 /* Standard driver model interfaces */ 170 int (*probe)(struct i2c_client *, const struct i2c_device_id *); 171 int (*remove)(struct i2c_client *); 172 173 /* driver model interfaces that don't relate to enumeration */ 174 void (*shutdown)(struct i2c_client *); 175 int (*suspend)(struct i2c_client *, pm_message_t mesg); 176 int (*resume)(struct i2c_client *); 177 178 /* Alert callback, for example for the SMBus alert protocol. 179 * The format and meaning of the data value depends on the protocol. 180 * For the SMBus alert protocol, there is a single bit of data passed 181 * as the alert response's low bit ("event flag"). 182 */ 183 void (*alert)(struct i2c_client *, unsigned int data); 184 185 /* a ioctl like command that can be used to perform specific functions 186 * with the device. 187 */ 188 int (*command)(struct i2c_client *client, unsigned int cmd, void *arg); 189 190 struct device_driver driver; 191 const struct i2c_device_id *id_table; 192 193 /* Device detection callback for automatic device creation */ 194 int (*detect)(struct i2c_client *, struct i2c_board_info *); 195 const unsigned short *address_list; 196 struct list_head clients; 197 }; 198 #define to_i2c_driver(d) container_of(d, struct i2c_driver, driver) 199 200 /** 201 * struct i2c_client - represent an I2C slave device 202 * @flags: I2C_CLIENT_TEN indicates the device uses a ten bit chip address; 203 * I2C_CLIENT_PEC indicates it uses SMBus Packet Error Checking 204 * @addr: Address used on the I2C bus connected to the parent adapter. 205 * @name: Indicates the type of the device, usually a chip name that's 206 * generic enough to hide second-sourcing and compatible revisions. 207 * @adapter: manages the bus segment hosting this I2C device 208 * @driver: device's driver, hence pointer to access routines 209 * @dev: Driver model device node for the slave. 210 * @irq: indicates the IRQ generated by this device (if any) 211 * @detected: member of an i2c_driver.clients list or i2c-core's 212 * userspace_devices list 213 * 214 * An i2c_client identifies a single device (i.e. chip) connected to an 215 * i2c bus. The behaviour exposed to Linux is defined by the driver 216 * managing the device. 217 */ 218 struct i2c_client { 219 unsigned short flags; /* div., see below */ 220 unsigned short addr; /* chip address - NOTE: 7bit */ 221 /* addresses are stored in the */ 222 /* _LOWER_ 7 bits */ 223 char name[I2C_NAME_SIZE]; 224 struct i2c_adapter *adapter; /* the adapter we sit on */ 225 struct i2c_driver *driver; /* and our access routines */ 226 struct device dev; /* the device structure */ 227 int irq; /* irq issued by device */ 228 struct list_head detected; 229 }; 230 #define to_i2c_client(d) container_of(d, struct i2c_client, dev) 231 232 extern struct i2c_client *i2c_verify_client(struct device *dev); 233 234 static inline struct i2c_client *kobj_to_i2c_client(struct kobject *kobj) 235 { 236 struct device * const dev = container_of(kobj, struct device, kobj); 237 return to_i2c_client(dev); 238 } 239 240 static inline void *i2c_get_clientdata(const struct i2c_client *dev) 241 { 242 return dev_get_drvdata(&dev->dev); 243 } 244 245 static inline void i2c_set_clientdata(struct i2c_client *dev, void *data) 246 { 247 dev_set_drvdata(&dev->dev, data); 248 } 249 250 /** 251 * struct i2c_board_info - template for device creation 252 * @type: chip type, to initialize i2c_client.name 253 * @flags: to initialize i2c_client.flags 254 * @addr: stored in i2c_client.addr 255 * @platform_data: stored in i2c_client.dev.platform_data 256 * @archdata: copied into i2c_client.dev.archdata 257 * @of_node: pointer to OpenFirmware device node 258 * @irq: stored in i2c_client.irq 259 * 260 * I2C doesn't actually support hardware probing, although controllers and 261 * devices may be able to use I2C_SMBUS_QUICK to tell whether or not there's 262 * a device at a given address. Drivers commonly need more information than 263 * that, such as chip type, configuration, associated IRQ, and so on. 264 * 265 * i2c_board_info is used to build tables of information listing I2C devices 266 * that are present. This information is used to grow the driver model tree. 267 * For mainboards this is done statically using i2c_register_board_info(); 268 * bus numbers identify adapters that aren't yet available. For add-on boards, 269 * i2c_new_device() does this dynamically with the adapter already known. 270 */ 271 struct i2c_board_info { 272 char type[I2C_NAME_SIZE]; 273 unsigned short flags; 274 unsigned short addr; 275 void *platform_data; 276 struct dev_archdata *archdata; 277 struct device_node *of_node; 278 int irq; 279 }; 280 281 /** 282 * I2C_BOARD_INFO - macro used to list an i2c device and its address 283 * @dev_type: identifies the device type 284 * @dev_addr: the device's address on the bus. 285 * 286 * This macro initializes essential fields of a struct i2c_board_info, 287 * declaring what has been provided on a particular board. Optional 288 * fields (such as associated irq, or device-specific platform_data) 289 * are provided using conventional syntax. 290 */ 291 #define I2C_BOARD_INFO(dev_type, dev_addr) \ 292 .type = dev_type, .addr = (dev_addr) 293 294 295 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) 296 /* Add-on boards should register/unregister their devices; e.g. a board 297 * with integrated I2C, a config eeprom, sensors, and a codec that's 298 * used in conjunction with the primary hardware. 299 */ 300 extern struct i2c_client * 301 i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info); 302 303 /* If you don't know the exact address of an I2C device, use this variant 304 * instead, which can probe for device presence in a list of possible 305 * addresses. The "probe" callback function is optional. If it is provided, 306 * it must return 1 on successful probe, 0 otherwise. If it is not provided, 307 * a default probing method is used. 308 */ 309 extern struct i2c_client * 310 i2c_new_probed_device(struct i2c_adapter *adap, 311 struct i2c_board_info *info, 312 unsigned short const *addr_list, 313 int (*probe)(struct i2c_adapter *, unsigned short addr)); 314 315 /* Common custom probe functions */ 316 extern int i2c_probe_func_quick_read(struct i2c_adapter *, unsigned short addr); 317 318 /* For devices that use several addresses, use i2c_new_dummy() to make 319 * client handles for the extra addresses. 320 */ 321 extern struct i2c_client * 322 i2c_new_dummy(struct i2c_adapter *adap, u16 address); 323 324 extern void i2c_unregister_device(struct i2c_client *); 325 #endif /* I2C */ 326 327 /* Mainboard arch_initcall() code should register all its I2C devices. 328 * This is done at arch_initcall time, before declaring any i2c adapters. 329 * Modules for add-on boards must use other calls. 330 */ 331 #ifdef CONFIG_I2C_BOARDINFO 332 extern int 333 i2c_register_board_info(int busnum, struct i2c_board_info const *info, 334 unsigned n); 335 #else 336 static inline int 337 i2c_register_board_info(int busnum, struct i2c_board_info const *info, 338 unsigned n) 339 { 340 return 0; 341 } 342 #endif /* I2C_BOARDINFO */ 343 344 /* 345 * The following structs are for those who like to implement new bus drivers: 346 * i2c_algorithm is the interface to a class of hardware solutions which can 347 * be addressed using the same bus algorithms - i.e. bit-banging or the PCF8584 348 * to name two of the most common. 349 */ 350 struct i2c_algorithm { 351 /* If an adapter algorithm can't do I2C-level access, set master_xfer 352 to NULL. If an adapter algorithm can do SMBus access, set 353 smbus_xfer. If set to NULL, the SMBus protocol is simulated 354 using common I2C messages */ 355 /* master_xfer should return the number of messages successfully 356 processed, or a negative value on error */ 357 int (*master_xfer)(struct i2c_adapter *adap, struct i2c_msg *msgs, 358 int num); 359 int (*smbus_xfer) (struct i2c_adapter *adap, u16 addr, 360 unsigned short flags, char read_write, 361 u8 command, int size, union i2c_smbus_data *data); 362 363 /* To determine what the adapter supports */ 364 u32 (*functionality) (struct i2c_adapter *); 365 }; 366 367 /* 368 * i2c_adapter is the structure used to identify a physical i2c bus along 369 * with the access algorithms necessary to access it. 370 */ 371 struct i2c_adapter { 372 struct module *owner; 373 unsigned int class; /* classes to allow probing for */ 374 const struct i2c_algorithm *algo; /* the algorithm to access the bus */ 375 void *algo_data; 376 377 /* data fields that are valid for all devices */ 378 struct rt_mutex bus_lock; 379 380 int timeout; /* in jiffies */ 381 int retries; 382 struct device dev; /* the adapter device */ 383 384 int nr; 385 char name[48]; 386 struct completion dev_released; 387 388 struct mutex userspace_clients_lock; 389 struct list_head userspace_clients; 390 }; 391 #define to_i2c_adapter(d) container_of(d, struct i2c_adapter, dev) 392 393 static inline void *i2c_get_adapdata(const struct i2c_adapter *dev) 394 { 395 return dev_get_drvdata(&dev->dev); 396 } 397 398 static inline void i2c_set_adapdata(struct i2c_adapter *dev, void *data) 399 { 400 dev_set_drvdata(&dev->dev, data); 401 } 402 403 static inline struct i2c_adapter * 404 i2c_parent_is_i2c_adapter(const struct i2c_adapter *adapter) 405 { 406 struct device *parent = adapter->dev.parent; 407 408 if (parent != NULL && parent->type == &i2c_adapter_type) 409 return to_i2c_adapter(parent); 410 else 411 return NULL; 412 } 413 414 int i2c_for_each_dev(void *data, int (*fn)(struct device *, void *)); 415 416 /* Adapter locking functions, exported for shared pin cases */ 417 void i2c_lock_adapter(struct i2c_adapter *); 418 void i2c_unlock_adapter(struct i2c_adapter *); 419 420 /*flags for the client struct: */ 421 #define I2C_CLIENT_PEC 0x04 /* Use Packet Error Checking */ 422 #define I2C_CLIENT_TEN 0x10 /* we have a ten bit chip address */ 423 /* Must equal I2C_M_TEN below */ 424 #define I2C_CLIENT_WAKE 0x80 /* for board_info; true iff can wake */ 425 426 /* i2c adapter classes (bitmask) */ 427 #define I2C_CLASS_HWMON (1<<0) /* lm_sensors, ... */ 428 #define I2C_CLASS_DDC (1<<3) /* DDC bus on graphics adapters */ 429 #define I2C_CLASS_SPD (1<<7) /* Memory modules */ 430 431 /* Internal numbers to terminate lists */ 432 #define I2C_CLIENT_END 0xfffeU 433 434 /* The numbers to use to set I2C bus address */ 435 #define ANY_I2C_BUS 0xffff 436 437 /* Construct an I2C_CLIENT_END-terminated array of i2c addresses */ 438 #define I2C_ADDRS(addr, addrs...) \ 439 ((const unsigned short []){ addr, ## addrs, I2C_CLIENT_END }) 440 441 442 /* ----- functions exported by i2c.o */ 443 444 /* administration... 445 */ 446 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) 447 extern int i2c_add_adapter(struct i2c_adapter *); 448 extern int i2c_del_adapter(struct i2c_adapter *); 449 extern int i2c_add_numbered_adapter(struct i2c_adapter *); 450 451 extern int i2c_register_driver(struct module *, struct i2c_driver *); 452 extern void i2c_del_driver(struct i2c_driver *); 453 454 static inline int i2c_add_driver(struct i2c_driver *driver) 455 { 456 return i2c_register_driver(THIS_MODULE, driver); 457 } 458 459 extern struct i2c_client *i2c_use_client(struct i2c_client *client); 460 extern void i2c_release_client(struct i2c_client *client); 461 462 /* call the i2c_client->command() of all attached clients with 463 * the given arguments */ 464 extern void i2c_clients_command(struct i2c_adapter *adap, 465 unsigned int cmd, void *arg); 466 467 extern struct i2c_adapter *i2c_get_adapter(int nr); 468 extern void i2c_put_adapter(struct i2c_adapter *adap); 469 470 471 /* Return the functionality mask */ 472 static inline u32 i2c_get_functionality(struct i2c_adapter *adap) 473 { 474 return adap->algo->functionality(adap); 475 } 476 477 /* Return 1 if adapter supports everything we need, 0 if not. */ 478 static inline int i2c_check_functionality(struct i2c_adapter *adap, u32 func) 479 { 480 return (func & i2c_get_functionality(adap)) == func; 481 } 482 483 /* Return the adapter number for a specific adapter */ 484 static inline int i2c_adapter_id(struct i2c_adapter *adap) 485 { 486 return adap->nr; 487 } 488 #endif /* I2C */ 489 #endif /* __KERNEL__ */ 490 491 /** 492 * struct i2c_msg - an I2C transaction segment beginning with START 493 * @addr: Slave address, either seven or ten bits. When this is a ten 494 * bit address, I2C_M_TEN must be set in @flags and the adapter 495 * must support I2C_FUNC_10BIT_ADDR. 496 * @flags: I2C_M_RD is handled by all adapters. No other flags may be 497 * provided unless the adapter exported the relevant I2C_FUNC_* 498 * flags through i2c_check_functionality(). 499 * @len: Number of data bytes in @buf being read from or written to the 500 * I2C slave address. For read transactions where I2C_M_RECV_LEN 501 * is set, the caller guarantees that this buffer can hold up to 502 * 32 bytes in addition to the initial length byte sent by the 503 * slave (plus, if used, the SMBus PEC); and this value will be 504 * incremented by the number of block data bytes received. 505 * @buf: The buffer into which data is read, or from which it's written. 506 * 507 * An i2c_msg is the low level representation of one segment of an I2C 508 * transaction. It is visible to drivers in the @i2c_transfer() procedure, 509 * to userspace from i2c-dev, and to I2C adapter drivers through the 510 * @i2c_adapter.@master_xfer() method. 511 * 512 * Except when I2C "protocol mangling" is used, all I2C adapters implement 513 * the standard rules for I2C transactions. Each transaction begins with a 514 * START. That is followed by the slave address, and a bit encoding read 515 * versus write. Then follow all the data bytes, possibly including a byte 516 * with SMBus PEC. The transfer terminates with a NAK, or when all those 517 * bytes have been transferred and ACKed. If this is the last message in a 518 * group, it is followed by a STOP. Otherwise it is followed by the next 519 * @i2c_msg transaction segment, beginning with a (repeated) START. 520 * 521 * Alternatively, when the adapter supports I2C_FUNC_PROTOCOL_MANGLING then 522 * passing certain @flags may have changed those standard protocol behaviors. 523 * Those flags are only for use with broken/nonconforming slaves, and with 524 * adapters which are known to support the specific mangling options they 525 * need (one or more of IGNORE_NAK, NO_RD_ACK, NOSTART, and REV_DIR_ADDR). 526 */ 527 struct i2c_msg { 528 __u16 addr; /* slave address */ 529 __u16 flags; 530 #define I2C_M_TEN 0x0010 /* this is a ten bit chip address */ 531 #define I2C_M_RD 0x0001 /* read data, from slave to master */ 532 #define I2C_M_NOSTART 0x4000 /* if I2C_FUNC_PROTOCOL_MANGLING */ 533 #define I2C_M_REV_DIR_ADDR 0x2000 /* if I2C_FUNC_PROTOCOL_MANGLING */ 534 #define I2C_M_IGNORE_NAK 0x1000 /* if I2C_FUNC_PROTOCOL_MANGLING */ 535 #define I2C_M_NO_RD_ACK 0x0800 /* if I2C_FUNC_PROTOCOL_MANGLING */ 536 #define I2C_M_RECV_LEN 0x0400 /* length will be first received byte */ 537 __u16 len; /* msg length */ 538 __u8 *buf; /* pointer to msg data */ 539 }; 540 541 /* To determine what functionality is present */ 542 543 #define I2C_FUNC_I2C 0x00000001 544 #define I2C_FUNC_10BIT_ADDR 0x00000002 545 #define I2C_FUNC_PROTOCOL_MANGLING 0x00000004 /* I2C_M_NOSTART etc. */ 546 #define I2C_FUNC_SMBUS_PEC 0x00000008 547 #define I2C_FUNC_SMBUS_BLOCK_PROC_CALL 0x00008000 /* SMBus 2.0 */ 548 #define I2C_FUNC_SMBUS_QUICK 0x00010000 549 #define I2C_FUNC_SMBUS_READ_BYTE 0x00020000 550 #define I2C_FUNC_SMBUS_WRITE_BYTE 0x00040000 551 #define I2C_FUNC_SMBUS_READ_BYTE_DATA 0x00080000 552 #define I2C_FUNC_SMBUS_WRITE_BYTE_DATA 0x00100000 553 #define I2C_FUNC_SMBUS_READ_WORD_DATA 0x00200000 554 #define I2C_FUNC_SMBUS_WRITE_WORD_DATA 0x00400000 555 #define I2C_FUNC_SMBUS_PROC_CALL 0x00800000 556 #define I2C_FUNC_SMBUS_READ_BLOCK_DATA 0x01000000 557 #define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA 0x02000000 558 #define I2C_FUNC_SMBUS_READ_I2C_BLOCK 0x04000000 /* I2C-like block xfer */ 559 #define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK 0x08000000 /* w/ 1-byte reg. addr. */ 560 561 #define I2C_FUNC_SMBUS_BYTE (I2C_FUNC_SMBUS_READ_BYTE | \ 562 I2C_FUNC_SMBUS_WRITE_BYTE) 563 #define I2C_FUNC_SMBUS_BYTE_DATA (I2C_FUNC_SMBUS_READ_BYTE_DATA | \ 564 I2C_FUNC_SMBUS_WRITE_BYTE_DATA) 565 #define I2C_FUNC_SMBUS_WORD_DATA (I2C_FUNC_SMBUS_READ_WORD_DATA | \ 566 I2C_FUNC_SMBUS_WRITE_WORD_DATA) 567 #define I2C_FUNC_SMBUS_BLOCK_DATA (I2C_FUNC_SMBUS_READ_BLOCK_DATA | \ 568 I2C_FUNC_SMBUS_WRITE_BLOCK_DATA) 569 #define I2C_FUNC_SMBUS_I2C_BLOCK (I2C_FUNC_SMBUS_READ_I2C_BLOCK | \ 570 I2C_FUNC_SMBUS_WRITE_I2C_BLOCK) 571 572 #define I2C_FUNC_SMBUS_EMUL (I2C_FUNC_SMBUS_QUICK | \ 573 I2C_FUNC_SMBUS_BYTE | \ 574 I2C_FUNC_SMBUS_BYTE_DATA | \ 575 I2C_FUNC_SMBUS_WORD_DATA | \ 576 I2C_FUNC_SMBUS_PROC_CALL | \ 577 I2C_FUNC_SMBUS_WRITE_BLOCK_DATA | \ 578 I2C_FUNC_SMBUS_I2C_BLOCK | \ 579 I2C_FUNC_SMBUS_PEC) 580 581 /* 582 * Data for SMBus Messages 583 */ 584 #define I2C_SMBUS_BLOCK_MAX 32 /* As specified in SMBus standard */ 585 union i2c_smbus_data { 586 __u8 byte; 587 __u16 word; 588 __u8 block[I2C_SMBUS_BLOCK_MAX + 2]; /* block[0] is used for length */ 589 /* and one more for user-space compatibility */ 590 }; 591 592 /* i2c_smbus_xfer read or write markers */ 593 #define I2C_SMBUS_READ 1 594 #define I2C_SMBUS_WRITE 0 595 596 /* SMBus transaction types (size parameter in the above functions) 597 Note: these no longer correspond to the (arbitrary) PIIX4 internal codes! */ 598 #define I2C_SMBUS_QUICK 0 599 #define I2C_SMBUS_BYTE 1 600 #define I2C_SMBUS_BYTE_DATA 2 601 #define I2C_SMBUS_WORD_DATA 3 602 #define I2C_SMBUS_PROC_CALL 4 603 #define I2C_SMBUS_BLOCK_DATA 5 604 #define I2C_SMBUS_I2C_BLOCK_BROKEN 6 605 #define I2C_SMBUS_BLOCK_PROC_CALL 7 /* SMBus 2.0 */ 606 #define I2C_SMBUS_I2C_BLOCK_DATA 8 607 608 #endif /* _LINUX_I2C_H */ 609