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/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 39 extern struct bus_type i2c_bus_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(struct i2c_client *client, const char *buf, 60 int count); 61 extern int i2c_master_recv(struct i2c_client *client, char *buf, int count); 62 63 /* Transfer num messages. 64 */ 65 extern 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. */ 73 extern 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 80 extern s32 i2c_smbus_read_byte(struct i2c_client *client); 81 extern s32 i2c_smbus_write_byte(struct i2c_client *client, u8 value); 82 extern s32 i2c_smbus_read_byte_data(struct i2c_client *client, u8 command); 83 extern s32 i2c_smbus_write_byte_data(struct i2c_client *client, 84 u8 command, u8 value); 85 extern s32 i2c_smbus_read_word_data(struct i2c_client *client, u8 command); 86 extern s32 i2c_smbus_write_word_data(struct i2c_client *client, 87 u8 command, u16 value); 88 /* Returns the number of read bytes */ 89 extern s32 i2c_smbus_read_block_data(struct i2c_client *client, 90 u8 command, u8 *values); 91 extern 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 */ 94 extern s32 i2c_smbus_read_i2c_block_data(struct i2c_client *client, 95 u8 command, u8 length, u8 *values); 96 extern 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 * @alert: Alert callback, for example for the SMBus alert protocol 112 * @command: Callback for bus-wide signaling (optional) 113 * @driver: Device driver model driver 114 * @id_table: List of I2C devices supported by this driver 115 * @detect: Callback for device detection 116 * @address_list: The I2C addresses to probe (for detect) 117 * @clients: List of detected clients we created (for i2c-core use only) 118 * 119 * The driver.owner field should be set to the module owner of this driver. 120 * The driver.name field should be set to the name of this driver. 121 * 122 * For automatic device detection, both @detect and @address_data must 123 * be defined. @class should also be set, otherwise only devices forced 124 * with module parameters will be created. The detect function must 125 * fill at least the name field of the i2c_board_info structure it is 126 * handed upon successful detection, and possibly also the flags field. 127 * 128 * If @detect is missing, the driver will still work fine for enumerated 129 * devices. Detected devices simply won't be supported. This is expected 130 * for the many I2C/SMBus devices which can't be detected reliably, and 131 * the ones which can always be enumerated in practice. 132 * 133 * The i2c_client structure which is handed to the @detect callback is 134 * not a real i2c_client. It is initialized just enough so that you can 135 * call i2c_smbus_read_byte_data and friends on it. Don't do anything 136 * else with it. In particular, calling dev_dbg and friends on it is 137 * not allowed. 138 */ 139 struct i2c_driver { 140 unsigned int class; 141 142 /* Notifies the driver that a new bus has appeared or is about to be 143 * removed. You should avoid using this if you can, it will probably 144 * be removed in a near future. 145 */ 146 int (*attach_adapter)(struct i2c_adapter *); 147 int (*detach_adapter)(struct i2c_adapter *); 148 149 /* Standard driver model interfaces */ 150 int (*probe)(struct i2c_client *, const struct i2c_device_id *); 151 int (*remove)(struct i2c_client *); 152 153 /* driver model interfaces that don't relate to enumeration */ 154 void (*shutdown)(struct i2c_client *); 155 int (*suspend)(struct i2c_client *, pm_message_t mesg); 156 int (*resume)(struct i2c_client *); 157 158 /* Alert callback, for example for the SMBus alert protocol. 159 * The format and meaning of the data value depends on the protocol. 160 * For the SMBus alert protocol, there is a single bit of data passed 161 * as the alert response's low bit ("event flag"). 162 */ 163 void (*alert)(struct i2c_client *, unsigned int data); 164 165 /* a ioctl like command that can be used to perform specific functions 166 * with the device. 167 */ 168 int (*command)(struct i2c_client *client, unsigned int cmd, void *arg); 169 170 struct device_driver driver; 171 const struct i2c_device_id *id_table; 172 173 /* Device detection callback for automatic device creation */ 174 int (*detect)(struct i2c_client *, struct i2c_board_info *); 175 const unsigned short *address_list; 176 struct list_head clients; 177 }; 178 #define to_i2c_driver(d) container_of(d, struct i2c_driver, driver) 179 180 /** 181 * struct i2c_client - represent an I2C slave device 182 * @flags: I2C_CLIENT_TEN indicates the device uses a ten bit chip address; 183 * I2C_CLIENT_PEC indicates it uses SMBus Packet Error Checking 184 * @addr: Address used on the I2C bus connected to the parent adapter. 185 * @name: Indicates the type of the device, usually a chip name that's 186 * generic enough to hide second-sourcing and compatible revisions. 187 * @adapter: manages the bus segment hosting this I2C device 188 * @driver: device's driver, hence pointer to access routines 189 * @dev: Driver model device node for the slave. 190 * @irq: indicates the IRQ generated by this device (if any) 191 * @detected: member of an i2c_driver.clients list or i2c-core's 192 * userspace_devices list 193 * 194 * An i2c_client identifies a single device (i.e. chip) connected to an 195 * i2c bus. The behaviour exposed to Linux is defined by the driver 196 * managing the device. 197 */ 198 struct i2c_client { 199 unsigned short flags; /* div., see below */ 200 unsigned short addr; /* chip address - NOTE: 7bit */ 201 /* addresses are stored in the */ 202 /* _LOWER_ 7 bits */ 203 char name[I2C_NAME_SIZE]; 204 struct i2c_adapter *adapter; /* the adapter we sit on */ 205 struct i2c_driver *driver; /* and our access routines */ 206 struct device dev; /* the device structure */ 207 int irq; /* irq issued by device */ 208 struct list_head detected; 209 }; 210 #define to_i2c_client(d) container_of(d, struct i2c_client, dev) 211 212 extern struct i2c_client *i2c_verify_client(struct device *dev); 213 214 static inline struct i2c_client *kobj_to_i2c_client(struct kobject *kobj) 215 { 216 struct device * const dev = container_of(kobj, struct device, kobj); 217 return to_i2c_client(dev); 218 } 219 220 static inline void *i2c_get_clientdata(const struct i2c_client *dev) 221 { 222 return dev_get_drvdata(&dev->dev); 223 } 224 225 static inline void i2c_set_clientdata(struct i2c_client *dev, void *data) 226 { 227 dev_set_drvdata(&dev->dev, data); 228 } 229 230 /** 231 * struct i2c_board_info - template for device creation 232 * @type: chip type, to initialize i2c_client.name 233 * @flags: to initialize i2c_client.flags 234 * @addr: stored in i2c_client.addr 235 * @platform_data: stored in i2c_client.dev.platform_data 236 * @archdata: copied into i2c_client.dev.archdata 237 * @of_node: pointer to OpenFirmware device node 238 * @irq: stored in i2c_client.irq 239 * 240 * I2C doesn't actually support hardware probing, although controllers and 241 * devices may be able to use I2C_SMBUS_QUICK to tell whether or not there's 242 * a device at a given address. Drivers commonly need more information than 243 * that, such as chip type, configuration, associated IRQ, and so on. 244 * 245 * i2c_board_info is used to build tables of information listing I2C devices 246 * that are present. This information is used to grow the driver model tree. 247 * For mainboards this is done statically using i2c_register_board_info(); 248 * bus numbers identify adapters that aren't yet available. For add-on boards, 249 * i2c_new_device() does this dynamically with the adapter already known. 250 */ 251 struct i2c_board_info { 252 char type[I2C_NAME_SIZE]; 253 unsigned short flags; 254 unsigned short addr; 255 void *platform_data; 256 struct dev_archdata *archdata; 257 #ifdef CONFIG_OF 258 struct device_node *of_node; 259 #endif 260 int irq; 261 }; 262 263 /** 264 * I2C_BOARD_INFO - macro used to list an i2c device and its address 265 * @dev_type: identifies the device type 266 * @dev_addr: the device's address on the bus. 267 * 268 * This macro initializes essential fields of a struct i2c_board_info, 269 * declaring what has been provided on a particular board. Optional 270 * fields (such as associated irq, or device-specific platform_data) 271 * are provided using conventional syntax. 272 */ 273 #define I2C_BOARD_INFO(dev_type, dev_addr) \ 274 .type = dev_type, .addr = (dev_addr) 275 276 277 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) 278 /* Add-on boards should register/unregister their devices; e.g. a board 279 * with integrated I2C, a config eeprom, sensors, and a codec that's 280 * used in conjunction with the primary hardware. 281 */ 282 extern struct i2c_client * 283 i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info); 284 285 /* If you don't know the exact address of an I2C device, use this variant 286 * instead, which can probe for device presence in a list of possible 287 * addresses. 288 */ 289 extern struct i2c_client * 290 i2c_new_probed_device(struct i2c_adapter *adap, 291 struct i2c_board_info *info, 292 unsigned short const *addr_list); 293 294 /* For devices that use several addresses, use i2c_new_dummy() to make 295 * client handles for the extra addresses. 296 */ 297 extern struct i2c_client * 298 i2c_new_dummy(struct i2c_adapter *adap, u16 address); 299 300 extern void i2c_unregister_device(struct i2c_client *); 301 #endif /* I2C */ 302 303 /* Mainboard arch_initcall() code should register all its I2C devices. 304 * This is done at arch_initcall time, before declaring any i2c adapters. 305 * Modules for add-on boards must use other calls. 306 */ 307 #ifdef CONFIG_I2C_BOARDINFO 308 extern int 309 i2c_register_board_info(int busnum, struct i2c_board_info const *info, 310 unsigned n); 311 #else 312 static inline int 313 i2c_register_board_info(int busnum, struct i2c_board_info const *info, 314 unsigned n) 315 { 316 return 0; 317 } 318 #endif /* I2C_BOARDINFO */ 319 320 /* 321 * The following structs are for those who like to implement new bus drivers: 322 * i2c_algorithm is the interface to a class of hardware solutions which can 323 * be addressed using the same bus algorithms - i.e. bit-banging or the PCF8584 324 * to name two of the most common. 325 */ 326 struct i2c_algorithm { 327 /* If an adapter algorithm can't do I2C-level access, set master_xfer 328 to NULL. If an adapter algorithm can do SMBus access, set 329 smbus_xfer. If set to NULL, the SMBus protocol is simulated 330 using common I2C messages */ 331 /* master_xfer should return the number of messages successfully 332 processed, or a negative value on error */ 333 int (*master_xfer)(struct i2c_adapter *adap, struct i2c_msg *msgs, 334 int num); 335 int (*smbus_xfer) (struct i2c_adapter *adap, u16 addr, 336 unsigned short flags, char read_write, 337 u8 command, int size, union i2c_smbus_data *data); 338 339 /* To determine what the adapter supports */ 340 u32 (*functionality) (struct i2c_adapter *); 341 }; 342 343 /* 344 * i2c_adapter is the structure used to identify a physical i2c bus along 345 * with the access algorithms necessary to access it. 346 */ 347 struct i2c_adapter { 348 struct module *owner; 349 unsigned int id; 350 unsigned int class; /* classes to allow probing for */ 351 const struct i2c_algorithm *algo; /* the algorithm to access the bus */ 352 void *algo_data; 353 354 /* data fields that are valid for all devices */ 355 struct rt_mutex bus_lock; 356 357 int timeout; /* in jiffies */ 358 int retries; 359 struct device dev; /* the adapter device */ 360 361 int nr; 362 char name[48]; 363 struct completion dev_released; 364 365 struct list_head userspace_clients; 366 }; 367 #define to_i2c_adapter(d) container_of(d, struct i2c_adapter, dev) 368 369 static inline void *i2c_get_adapdata(const struct i2c_adapter *dev) 370 { 371 return dev_get_drvdata(&dev->dev); 372 } 373 374 static inline void i2c_set_adapdata(struct i2c_adapter *dev, void *data) 375 { 376 dev_set_drvdata(&dev->dev, data); 377 } 378 379 /** 380 * i2c_lock_adapter - Prevent access to an I2C bus segment 381 * @adapter: Target I2C bus segment 382 */ 383 static inline void i2c_lock_adapter(struct i2c_adapter *adapter) 384 { 385 rt_mutex_lock(&adapter->bus_lock); 386 } 387 388 /** 389 * i2c_unlock_adapter - Reauthorize access to an I2C bus segment 390 * @adapter: Target I2C bus segment 391 */ 392 static inline void i2c_unlock_adapter(struct i2c_adapter *adapter) 393 { 394 rt_mutex_unlock(&adapter->bus_lock); 395 } 396 397 /*flags for the client struct: */ 398 #define I2C_CLIENT_PEC 0x04 /* Use Packet Error Checking */ 399 #define I2C_CLIENT_TEN 0x10 /* we have a ten bit chip address */ 400 /* Must equal I2C_M_TEN below */ 401 #define I2C_CLIENT_WAKE 0x80 /* for board_info; true iff can wake */ 402 403 /* i2c adapter classes (bitmask) */ 404 #define I2C_CLASS_HWMON (1<<0) /* lm_sensors, ... */ 405 #define I2C_CLASS_TV_ANALOG (1<<1) /* bttv + friends */ 406 #define I2C_CLASS_TV_DIGITAL (1<<2) /* dvb cards */ 407 #define I2C_CLASS_DDC (1<<3) /* DDC bus on graphics adapters */ 408 #define I2C_CLASS_SPD (1<<7) /* SPD EEPROMs and similar */ 409 410 /* Internal numbers to terminate lists */ 411 #define I2C_CLIENT_END 0xfffeU 412 413 /* The numbers to use to set I2C bus address */ 414 #define ANY_I2C_BUS 0xffff 415 416 /* Construct an I2C_CLIENT_END-terminated array of i2c addresses */ 417 #define I2C_ADDRS(addr, addrs...) \ 418 ((const unsigned short []){ addr, ## addrs, I2C_CLIENT_END }) 419 420 421 /* ----- functions exported by i2c.o */ 422 423 /* administration... 424 */ 425 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) 426 extern int i2c_add_adapter(struct i2c_adapter *); 427 extern int i2c_del_adapter(struct i2c_adapter *); 428 extern int i2c_add_numbered_adapter(struct i2c_adapter *); 429 430 extern int i2c_register_driver(struct module *, struct i2c_driver *); 431 extern void i2c_del_driver(struct i2c_driver *); 432 433 static inline int i2c_add_driver(struct i2c_driver *driver) 434 { 435 return i2c_register_driver(THIS_MODULE, driver); 436 } 437 438 extern struct i2c_client *i2c_use_client(struct i2c_client *client); 439 extern void i2c_release_client(struct i2c_client *client); 440 441 /* call the i2c_client->command() of all attached clients with 442 * the given arguments */ 443 extern void i2c_clients_command(struct i2c_adapter *adap, 444 unsigned int cmd, void *arg); 445 446 extern struct i2c_adapter *i2c_get_adapter(int id); 447 extern void i2c_put_adapter(struct i2c_adapter *adap); 448 449 450 /* Return the functionality mask */ 451 static inline u32 i2c_get_functionality(struct i2c_adapter *adap) 452 { 453 return adap->algo->functionality(adap); 454 } 455 456 /* Return 1 if adapter supports everything we need, 0 if not. */ 457 static inline int i2c_check_functionality(struct i2c_adapter *adap, u32 func) 458 { 459 return (func & i2c_get_functionality(adap)) == func; 460 } 461 462 /* Return the adapter number for a specific adapter */ 463 static inline int i2c_adapter_id(struct i2c_adapter *adap) 464 { 465 return adap->nr; 466 } 467 #endif /* I2C */ 468 #endif /* __KERNEL__ */ 469 470 /** 471 * struct i2c_msg - an I2C transaction segment beginning with START 472 * @addr: Slave address, either seven or ten bits. When this is a ten 473 * bit address, I2C_M_TEN must be set in @flags and the adapter 474 * must support I2C_FUNC_10BIT_ADDR. 475 * @flags: I2C_M_RD is handled by all adapters. No other flags may be 476 * provided unless the adapter exported the relevant I2C_FUNC_* 477 * flags through i2c_check_functionality(). 478 * @len: Number of data bytes in @buf being read from or written to the 479 * I2C slave address. For read transactions where I2C_M_RECV_LEN 480 * is set, the caller guarantees that this buffer can hold up to 481 * 32 bytes in addition to the initial length byte sent by the 482 * slave (plus, if used, the SMBus PEC); and this value will be 483 * incremented by the number of block data bytes received. 484 * @buf: The buffer into which data is read, or from which it's written. 485 * 486 * An i2c_msg is the low level representation of one segment of an I2C 487 * transaction. It is visible to drivers in the @i2c_transfer() procedure, 488 * to userspace from i2c-dev, and to I2C adapter drivers through the 489 * @i2c_adapter.@master_xfer() method. 490 * 491 * Except when I2C "protocol mangling" is used, all I2C adapters implement 492 * the standard rules for I2C transactions. Each transaction begins with a 493 * START. That is followed by the slave address, and a bit encoding read 494 * versus write. Then follow all the data bytes, possibly including a byte 495 * with SMBus PEC. The transfer terminates with a NAK, or when all those 496 * bytes have been transferred and ACKed. If this is the last message in a 497 * group, it is followed by a STOP. Otherwise it is followed by the next 498 * @i2c_msg transaction segment, beginning with a (repeated) START. 499 * 500 * Alternatively, when the adapter supports I2C_FUNC_PROTOCOL_MANGLING then 501 * passing certain @flags may have changed those standard protocol behaviors. 502 * Those flags are only for use with broken/nonconforming slaves, and with 503 * adapters which are known to support the specific mangling options they 504 * need (one or more of IGNORE_NAK, NO_RD_ACK, NOSTART, and REV_DIR_ADDR). 505 */ 506 struct i2c_msg { 507 __u16 addr; /* slave address */ 508 __u16 flags; 509 #define I2C_M_TEN 0x0010 /* this is a ten bit chip address */ 510 #define I2C_M_RD 0x0001 /* read data, from slave to master */ 511 #define I2C_M_NOSTART 0x4000 /* if I2C_FUNC_PROTOCOL_MANGLING */ 512 #define I2C_M_REV_DIR_ADDR 0x2000 /* if I2C_FUNC_PROTOCOL_MANGLING */ 513 #define I2C_M_IGNORE_NAK 0x1000 /* if I2C_FUNC_PROTOCOL_MANGLING */ 514 #define I2C_M_NO_RD_ACK 0x0800 /* if I2C_FUNC_PROTOCOL_MANGLING */ 515 #define I2C_M_RECV_LEN 0x0400 /* length will be first received byte */ 516 __u16 len; /* msg length */ 517 __u8 *buf; /* pointer to msg data */ 518 }; 519 520 /* To determine what functionality is present */ 521 522 #define I2C_FUNC_I2C 0x00000001 523 #define I2C_FUNC_10BIT_ADDR 0x00000002 524 #define I2C_FUNC_PROTOCOL_MANGLING 0x00000004 /* I2C_M_NOSTART etc. */ 525 #define I2C_FUNC_SMBUS_PEC 0x00000008 526 #define I2C_FUNC_SMBUS_BLOCK_PROC_CALL 0x00008000 /* SMBus 2.0 */ 527 #define I2C_FUNC_SMBUS_QUICK 0x00010000 528 #define I2C_FUNC_SMBUS_READ_BYTE 0x00020000 529 #define I2C_FUNC_SMBUS_WRITE_BYTE 0x00040000 530 #define I2C_FUNC_SMBUS_READ_BYTE_DATA 0x00080000 531 #define I2C_FUNC_SMBUS_WRITE_BYTE_DATA 0x00100000 532 #define I2C_FUNC_SMBUS_READ_WORD_DATA 0x00200000 533 #define I2C_FUNC_SMBUS_WRITE_WORD_DATA 0x00400000 534 #define I2C_FUNC_SMBUS_PROC_CALL 0x00800000 535 #define I2C_FUNC_SMBUS_READ_BLOCK_DATA 0x01000000 536 #define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA 0x02000000 537 #define I2C_FUNC_SMBUS_READ_I2C_BLOCK 0x04000000 /* I2C-like block xfer */ 538 #define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK 0x08000000 /* w/ 1-byte reg. addr. */ 539 540 #define I2C_FUNC_SMBUS_BYTE (I2C_FUNC_SMBUS_READ_BYTE | \ 541 I2C_FUNC_SMBUS_WRITE_BYTE) 542 #define I2C_FUNC_SMBUS_BYTE_DATA (I2C_FUNC_SMBUS_READ_BYTE_DATA | \ 543 I2C_FUNC_SMBUS_WRITE_BYTE_DATA) 544 #define I2C_FUNC_SMBUS_WORD_DATA (I2C_FUNC_SMBUS_READ_WORD_DATA | \ 545 I2C_FUNC_SMBUS_WRITE_WORD_DATA) 546 #define I2C_FUNC_SMBUS_BLOCK_DATA (I2C_FUNC_SMBUS_READ_BLOCK_DATA | \ 547 I2C_FUNC_SMBUS_WRITE_BLOCK_DATA) 548 #define I2C_FUNC_SMBUS_I2C_BLOCK (I2C_FUNC_SMBUS_READ_I2C_BLOCK | \ 549 I2C_FUNC_SMBUS_WRITE_I2C_BLOCK) 550 551 #define I2C_FUNC_SMBUS_EMUL (I2C_FUNC_SMBUS_QUICK | \ 552 I2C_FUNC_SMBUS_BYTE | \ 553 I2C_FUNC_SMBUS_BYTE_DATA | \ 554 I2C_FUNC_SMBUS_WORD_DATA | \ 555 I2C_FUNC_SMBUS_PROC_CALL | \ 556 I2C_FUNC_SMBUS_WRITE_BLOCK_DATA | \ 557 I2C_FUNC_SMBUS_I2C_BLOCK | \ 558 I2C_FUNC_SMBUS_PEC) 559 560 /* 561 * Data for SMBus Messages 562 */ 563 #define I2C_SMBUS_BLOCK_MAX 32 /* As specified in SMBus standard */ 564 union i2c_smbus_data { 565 __u8 byte; 566 __u16 word; 567 __u8 block[I2C_SMBUS_BLOCK_MAX + 2]; /* block[0] is used for length */ 568 /* and one more for user-space compatibility */ 569 }; 570 571 /* i2c_smbus_xfer read or write markers */ 572 #define I2C_SMBUS_READ 1 573 #define I2C_SMBUS_WRITE 0 574 575 /* SMBus transaction types (size parameter in the above functions) 576 Note: these no longer correspond to the (arbitrary) PIIX4 internal codes! */ 577 #define I2C_SMBUS_QUICK 0 578 #define I2C_SMBUS_BYTE 1 579 #define I2C_SMBUS_BYTE_DATA 2 580 #define I2C_SMBUS_WORD_DATA 3 581 #define I2C_SMBUS_PROC_CALL 4 582 #define I2C_SMBUS_BLOCK_DATA 5 583 #define I2C_SMBUS_I2C_BLOCK_BROKEN 6 584 #define I2C_SMBUS_BLOCK_PROC_CALL 7 /* SMBus 2.0 */ 585 #define I2C_SMBUS_I2C_BLOCK_DATA 8 586 587 #endif /* _LINUX_I2C_H */ 588