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., 51 Franklin Street, Fifth Floor, Boston, 21 MA 02110-1301 USA. */ 22 /* ------------------------------------------------------------------------- */ 23 24 /* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and 25 Frodo Looijaard <frodol@dds.nl> */ 26 27 #ifndef _LINUX_I2C_H 28 #define _LINUX_I2C_H 29 30 #include <linux/types.h> 31 #ifdef __KERNEL__ 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 struct module; 53 54 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) 55 /* 56 * The master routines are the ones normally used to transmit data to devices 57 * on a bus (or read from them). Apart from two basic transfer functions to 58 * transmit one message at a time, a more complex version can be used to 59 * transmit an arbitrary number of messages without interruption. 60 * @count must be be less than 64k since msg.len is u16. 61 */ 62 extern int i2c_master_send(const struct i2c_client *client, const char *buf, 63 int count); 64 extern int i2c_master_recv(const struct i2c_client *client, char *buf, 65 int count); 66 67 /* Transfer num messages. 68 */ 69 extern int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, 70 int num); 71 72 /* This is the very generalized SMBus access routine. You probably do not 73 want to use this, though; one of the functions below may be much easier, 74 and probably just as fast. 75 Note that we use i2c_adapter here, because you do not need a specific 76 smbus adapter to call this function. */ 77 extern s32 i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr, 78 unsigned short flags, char read_write, u8 command, 79 int size, union i2c_smbus_data *data); 80 81 /* Now follow the 'nice' access routines. These also document the calling 82 conventions of i2c_smbus_xfer. */ 83 84 extern s32 i2c_smbus_read_byte(const struct i2c_client *client); 85 extern s32 i2c_smbus_write_byte(const struct i2c_client *client, u8 value); 86 extern s32 i2c_smbus_read_byte_data(const struct i2c_client *client, 87 u8 command); 88 extern s32 i2c_smbus_write_byte_data(const struct i2c_client *client, 89 u8 command, u8 value); 90 extern s32 i2c_smbus_read_word_data(const struct i2c_client *client, 91 u8 command); 92 extern s32 i2c_smbus_write_word_data(const struct i2c_client *client, 93 u8 command, u16 value); 94 95 static inline s32 96 i2c_smbus_read_word_swapped(const struct i2c_client *client, u8 command) 97 { 98 s32 value = i2c_smbus_read_word_data(client, command); 99 100 return (value < 0) ? value : swab16(value); 101 } 102 103 static inline s32 104 i2c_smbus_write_word_swapped(const struct i2c_client *client, 105 u8 command, u16 value) 106 { 107 return i2c_smbus_write_word_data(client, command, swab16(value)); 108 } 109 110 /* Returns the number of read bytes */ 111 extern s32 i2c_smbus_read_block_data(const struct i2c_client *client, 112 u8 command, u8 *values); 113 extern s32 i2c_smbus_write_block_data(const struct i2c_client *client, 114 u8 command, u8 length, const u8 *values); 115 /* Returns the number of read bytes */ 116 extern s32 i2c_smbus_read_i2c_block_data(const struct i2c_client *client, 117 u8 command, u8 length, u8 *values); 118 extern s32 i2c_smbus_write_i2c_block_data(const struct i2c_client *client, 119 u8 command, u8 length, 120 const u8 *values); 121 #endif /* I2C */ 122 123 /** 124 * struct i2c_driver - represent an I2C device driver 125 * @class: What kind of i2c device we instantiate (for detect) 126 * @attach_adapter: Callback for bus addition (deprecated) 127 * @detach_adapter: Callback for bus removal (deprecated) 128 * @probe: Callback for device binding 129 * @remove: Callback for device unbinding 130 * @shutdown: Callback for device shutdown 131 * @suspend: Callback for device suspend 132 * @resume: Callback for device resume 133 * @alert: Alert callback, for example for the SMBus alert protocol 134 * @command: Callback for bus-wide signaling (optional) 135 * @driver: Device driver model driver 136 * @id_table: List of I2C devices supported by this driver 137 * @detect: Callback for device detection 138 * @address_list: The I2C addresses to probe (for detect) 139 * @clients: List of detected clients we created (for i2c-core use only) 140 * 141 * The driver.owner field should be set to the module owner of this driver. 142 * The driver.name field should be set to the name of this driver. 143 * 144 * For automatic device detection, both @detect and @address_data must 145 * be defined. @class should also be set, otherwise only devices forced 146 * with module parameters will be created. The detect function must 147 * fill at least the name field of the i2c_board_info structure it is 148 * handed upon successful detection, and possibly also the flags field. 149 * 150 * If @detect is missing, the driver will still work fine for enumerated 151 * devices. Detected devices simply won't be supported. This is expected 152 * for the many I2C/SMBus devices which can't be detected reliably, and 153 * the ones which can always be enumerated in practice. 154 * 155 * The i2c_client structure which is handed to the @detect callback is 156 * not a real i2c_client. It is initialized just enough so that you can 157 * call i2c_smbus_read_byte_data and friends on it. Don't do anything 158 * else with it. In particular, calling dev_dbg and friends on it is 159 * not allowed. 160 */ 161 struct i2c_driver { 162 unsigned int class; 163 164 /* Notifies the driver that a new bus has appeared or is about to be 165 * removed. You should avoid using this, it will be removed in a 166 * near future. 167 */ 168 int (*attach_adapter)(struct i2c_adapter *) __deprecated; 169 int (*detach_adapter)(struct i2c_adapter *) __deprecated; 170 171 /* Standard driver model interfaces */ 172 int (*probe)(struct i2c_client *, const struct i2c_device_id *); 173 int (*remove)(struct i2c_client *); 174 175 /* driver model interfaces that don't relate to enumeration */ 176 void (*shutdown)(struct i2c_client *); 177 int (*suspend)(struct i2c_client *, pm_message_t mesg); 178 int (*resume)(struct i2c_client *); 179 180 /* Alert callback, for example for the SMBus alert protocol. 181 * The format and meaning of the data value depends on the protocol. 182 * For the SMBus alert protocol, there is a single bit of data passed 183 * as the alert response's low bit ("event flag"). 184 */ 185 void (*alert)(struct i2c_client *, unsigned int data); 186 187 /* a ioctl like command that can be used to perform specific functions 188 * with the device. 189 */ 190 int (*command)(struct i2c_client *client, unsigned int cmd, void *arg); 191 192 struct device_driver driver; 193 const struct i2c_device_id *id_table; 194 195 /* Device detection callback for automatic device creation */ 196 int (*detect)(struct i2c_client *, struct i2c_board_info *); 197 const unsigned short *address_list; 198 struct list_head clients; 199 }; 200 #define to_i2c_driver(d) container_of(d, struct i2c_driver, driver) 201 202 /** 203 * struct i2c_client - represent an I2C slave device 204 * @flags: I2C_CLIENT_TEN indicates the device uses a ten bit chip address; 205 * I2C_CLIENT_PEC indicates it uses SMBus Packet Error Checking 206 * @addr: Address used on the I2C bus connected to the parent adapter. 207 * @name: Indicates the type of the device, usually a chip name that's 208 * generic enough to hide second-sourcing and compatible revisions. 209 * @adapter: manages the bus segment hosting this I2C device 210 * @driver: device's driver, hence pointer to access routines 211 * @dev: Driver model device node for the slave. 212 * @irq: indicates the IRQ generated by this device (if any) 213 * @detected: member of an i2c_driver.clients list or i2c-core's 214 * userspace_devices list 215 * 216 * An i2c_client identifies a single device (i.e. chip) connected to an 217 * i2c bus. The behaviour exposed to Linux is defined by the driver 218 * managing the device. 219 */ 220 struct i2c_client { 221 unsigned short flags; /* div., see below */ 222 unsigned short addr; /* chip address - NOTE: 7bit */ 223 /* addresses are stored in the */ 224 /* _LOWER_ 7 bits */ 225 char name[I2C_NAME_SIZE]; 226 struct i2c_adapter *adapter; /* the adapter we sit on */ 227 struct i2c_driver *driver; /* and our access routines */ 228 struct device dev; /* the device structure */ 229 int irq; /* irq issued by device */ 230 struct list_head detected; 231 }; 232 #define to_i2c_client(d) container_of(d, struct i2c_client, dev) 233 234 extern struct i2c_client *i2c_verify_client(struct device *dev); 235 236 static inline struct i2c_client *kobj_to_i2c_client(struct kobject *kobj) 237 { 238 struct device * const dev = container_of(kobj, struct device, kobj); 239 return to_i2c_client(dev); 240 } 241 242 static inline void *i2c_get_clientdata(const struct i2c_client *dev) 243 { 244 return dev_get_drvdata(&dev->dev); 245 } 246 247 static inline void i2c_set_clientdata(struct i2c_client *dev, void *data) 248 { 249 dev_set_drvdata(&dev->dev, data); 250 } 251 252 /** 253 * struct i2c_board_info - template for device creation 254 * @type: chip type, to initialize i2c_client.name 255 * @flags: to initialize i2c_client.flags 256 * @addr: stored in i2c_client.addr 257 * @platform_data: stored in i2c_client.dev.platform_data 258 * @archdata: copied into i2c_client.dev.archdata 259 * @of_node: pointer to OpenFirmware device node 260 * @irq: stored in i2c_client.irq 261 * 262 * I2C doesn't actually support hardware probing, although controllers and 263 * devices may be able to use I2C_SMBUS_QUICK to tell whether or not there's 264 * a device at a given address. Drivers commonly need more information than 265 * that, such as chip type, configuration, associated IRQ, and so on. 266 * 267 * i2c_board_info is used to build tables of information listing I2C devices 268 * that are present. This information is used to grow the driver model tree. 269 * For mainboards this is done statically using i2c_register_board_info(); 270 * bus numbers identify adapters that aren't yet available. For add-on boards, 271 * i2c_new_device() does this dynamically with the adapter already known. 272 */ 273 struct i2c_board_info { 274 char type[I2C_NAME_SIZE]; 275 unsigned short flags; 276 unsigned short addr; 277 void *platform_data; 278 struct dev_archdata *archdata; 279 struct device_node *of_node; 280 int irq; 281 }; 282 283 /** 284 * I2C_BOARD_INFO - macro used to list an i2c device and its address 285 * @dev_type: identifies the device type 286 * @dev_addr: the device's address on the bus. 287 * 288 * This macro initializes essential fields of a struct i2c_board_info, 289 * declaring what has been provided on a particular board. Optional 290 * fields (such as associated irq, or device-specific platform_data) 291 * are provided using conventional syntax. 292 */ 293 #define I2C_BOARD_INFO(dev_type, dev_addr) \ 294 .type = dev_type, .addr = (dev_addr) 295 296 297 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) 298 /* Add-on boards should register/unregister their devices; e.g. a board 299 * with integrated I2C, a config eeprom, sensors, and a codec that's 300 * used in conjunction with the primary hardware. 301 */ 302 extern struct i2c_client * 303 i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info); 304 305 /* If you don't know the exact address of an I2C device, use this variant 306 * instead, which can probe for device presence in a list of possible 307 * addresses. The "probe" callback function is optional. If it is provided, 308 * it must return 1 on successful probe, 0 otherwise. If it is not provided, 309 * a default probing method is used. 310 */ 311 extern struct i2c_client * 312 i2c_new_probed_device(struct i2c_adapter *adap, 313 struct i2c_board_info *info, 314 unsigned short const *addr_list, 315 int (*probe)(struct i2c_adapter *, unsigned short addr)); 316 317 /* Common custom probe functions */ 318 extern int i2c_probe_func_quick_read(struct i2c_adapter *, unsigned short addr); 319 320 /* For devices that use several addresses, use i2c_new_dummy() to make 321 * client handles for the extra addresses. 322 */ 323 extern struct i2c_client * 324 i2c_new_dummy(struct i2c_adapter *adap, u16 address); 325 326 extern void i2c_unregister_device(struct i2c_client *); 327 #endif /* I2C */ 328 329 /* Mainboard arch_initcall() code should register all its I2C devices. 330 * This is done at arch_initcall time, before declaring any i2c adapters. 331 * Modules for add-on boards must use other calls. 332 */ 333 #ifdef CONFIG_I2C_BOARDINFO 334 extern int 335 i2c_register_board_info(int busnum, struct i2c_board_info const *info, 336 unsigned n); 337 #else 338 static inline int 339 i2c_register_board_info(int busnum, struct i2c_board_info const *info, 340 unsigned n) 341 { 342 return 0; 343 } 344 #endif /* I2C_BOARDINFO */ 345 346 /* 347 * The following structs are for those who like to implement new bus drivers: 348 * i2c_algorithm is the interface to a class of hardware solutions which can 349 * be addressed using the same bus algorithms - i.e. bit-banging or the PCF8584 350 * to name two of the most common. 351 */ 352 struct i2c_algorithm { 353 /* If an adapter algorithm can't do I2C-level access, set master_xfer 354 to NULL. If an adapter algorithm can do SMBus access, set 355 smbus_xfer. If set to NULL, the SMBus protocol is simulated 356 using common I2C messages */ 357 /* master_xfer should return the number of messages successfully 358 processed, or a negative value on error */ 359 int (*master_xfer)(struct i2c_adapter *adap, struct i2c_msg *msgs, 360 int num); 361 int (*smbus_xfer) (struct i2c_adapter *adap, u16 addr, 362 unsigned short flags, char read_write, 363 u8 command, int size, union i2c_smbus_data *data); 364 365 /* To determine what the adapter supports */ 366 u32 (*functionality) (struct i2c_adapter *); 367 }; 368 369 /* 370 * i2c_adapter is the structure used to identify a physical i2c bus along 371 * with the access algorithms necessary to access it. 372 */ 373 struct i2c_adapter { 374 struct module *owner; 375 unsigned int class; /* classes to allow probing for */ 376 const struct i2c_algorithm *algo; /* the algorithm to access the bus */ 377 void *algo_data; 378 379 /* data fields that are valid for all devices */ 380 struct rt_mutex bus_lock; 381 382 int timeout; /* in jiffies */ 383 int retries; 384 struct device dev; /* the adapter device */ 385 386 int nr; 387 char name[48]; 388 struct completion dev_released; 389 390 struct mutex userspace_clients_lock; 391 struct list_head userspace_clients; 392 }; 393 #define to_i2c_adapter(d) container_of(d, struct i2c_adapter, dev) 394 395 static inline void *i2c_get_adapdata(const struct i2c_adapter *dev) 396 { 397 return dev_get_drvdata(&dev->dev); 398 } 399 400 static inline void i2c_set_adapdata(struct i2c_adapter *dev, void *data) 401 { 402 dev_set_drvdata(&dev->dev, data); 403 } 404 405 static inline struct i2c_adapter * 406 i2c_parent_is_i2c_adapter(const struct i2c_adapter *adapter) 407 { 408 struct device *parent = adapter->dev.parent; 409 410 if (parent != NULL && parent->type == &i2c_adapter_type) 411 return to_i2c_adapter(parent); 412 else 413 return NULL; 414 } 415 416 int i2c_for_each_dev(void *data, int (*fn)(struct device *, void *)); 417 418 /* Adapter locking functions, exported for shared pin cases */ 419 void i2c_lock_adapter(struct i2c_adapter *); 420 void i2c_unlock_adapter(struct i2c_adapter *); 421 422 /*flags for the client struct: */ 423 #define I2C_CLIENT_PEC 0x04 /* Use Packet Error Checking */ 424 #define I2C_CLIENT_TEN 0x10 /* we have a ten bit chip address */ 425 /* Must equal I2C_M_TEN below */ 426 #define I2C_CLIENT_WAKE 0x80 /* for board_info; true iff can wake */ 427 428 /* i2c adapter classes (bitmask) */ 429 #define I2C_CLASS_HWMON (1<<0) /* lm_sensors, ... */ 430 #define I2C_CLASS_DDC (1<<3) /* DDC bus on graphics adapters */ 431 #define I2C_CLASS_SPD (1<<7) /* Memory modules */ 432 433 /* Internal numbers to terminate lists */ 434 #define I2C_CLIENT_END 0xfffeU 435 436 /* Construct an I2C_CLIENT_END-terminated array of i2c addresses */ 437 #define I2C_ADDRS(addr, addrs...) \ 438 ((const unsigned short []){ addr, ## addrs, I2C_CLIENT_END }) 439 440 441 /* ----- functions exported by i2c.o */ 442 443 /* administration... 444 */ 445 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) 446 extern int i2c_add_adapter(struct i2c_adapter *); 447 extern int i2c_del_adapter(struct i2c_adapter *); 448 extern int i2c_add_numbered_adapter(struct i2c_adapter *); 449 450 extern int i2c_register_driver(struct module *, struct i2c_driver *); 451 extern void i2c_del_driver(struct i2c_driver *); 452 453 /* use a define to avoid include chaining to get THIS_MODULE */ 454 #define i2c_add_driver(driver) \ 455 i2c_register_driver(THIS_MODULE, driver) 456 457 extern struct i2c_client *i2c_use_client(struct i2c_client *client); 458 extern void i2c_release_client(struct i2c_client *client); 459 460 /* call the i2c_client->command() of all attached clients with 461 * the given arguments */ 462 extern void i2c_clients_command(struct i2c_adapter *adap, 463 unsigned int cmd, void *arg); 464 465 extern struct i2c_adapter *i2c_get_adapter(int nr); 466 extern void i2c_put_adapter(struct i2c_adapter *adap); 467 468 469 /* Return the functionality mask */ 470 static inline u32 i2c_get_functionality(struct i2c_adapter *adap) 471 { 472 return adap->algo->functionality(adap); 473 } 474 475 /* Return 1 if adapter supports everything we need, 0 if not. */ 476 static inline int i2c_check_functionality(struct i2c_adapter *adap, u32 func) 477 { 478 return (func & i2c_get_functionality(adap)) == func; 479 } 480 481 /* Return the adapter number for a specific adapter */ 482 static inline int i2c_adapter_id(struct i2c_adapter *adap) 483 { 484 return adap->nr; 485 } 486 487 /** 488 * module_i2c_driver() - Helper macro for registering a I2C driver 489 * @__i2c_driver: i2c_driver struct 490 * 491 * Helper macro for I2C drivers which do not do anything special in module 492 * init/exit. This eliminates a lot of boilerplate. Each module may only 493 * use this macro once, and calling it replaces module_init() and module_exit() 494 */ 495 #define module_i2c_driver(__i2c_driver) \ 496 module_driver(__i2c_driver, i2c_add_driver, \ 497 i2c_del_driver) 498 499 #endif /* I2C */ 500 #endif /* __KERNEL__ */ 501 502 /** 503 * struct i2c_msg - an I2C transaction segment beginning with START 504 * @addr: Slave address, either seven or ten bits. When this is a ten 505 * bit address, I2C_M_TEN must be set in @flags and the adapter 506 * must support I2C_FUNC_10BIT_ADDR. 507 * @flags: I2C_M_RD is handled by all adapters. No other flags may be 508 * provided unless the adapter exported the relevant I2C_FUNC_* 509 * flags through i2c_check_functionality(). 510 * @len: Number of data bytes in @buf being read from or written to the 511 * I2C slave address. For read transactions where I2C_M_RECV_LEN 512 * is set, the caller guarantees that this buffer can hold up to 513 * 32 bytes in addition to the initial length byte sent by the 514 * slave (plus, if used, the SMBus PEC); and this value will be 515 * incremented by the number of block data bytes received. 516 * @buf: The buffer into which data is read, or from which it's written. 517 * 518 * An i2c_msg is the low level representation of one segment of an I2C 519 * transaction. It is visible to drivers in the @i2c_transfer() procedure, 520 * to userspace from i2c-dev, and to I2C adapter drivers through the 521 * @i2c_adapter.@master_xfer() method. 522 * 523 * Except when I2C "protocol mangling" is used, all I2C adapters implement 524 * the standard rules for I2C transactions. Each transaction begins with a 525 * START. That is followed by the slave address, and a bit encoding read 526 * versus write. Then follow all the data bytes, possibly including a byte 527 * with SMBus PEC. The transfer terminates with a NAK, or when all those 528 * bytes have been transferred and ACKed. If this is the last message in a 529 * group, it is followed by a STOP. Otherwise it is followed by the next 530 * @i2c_msg transaction segment, beginning with a (repeated) START. 531 * 532 * Alternatively, when the adapter supports I2C_FUNC_PROTOCOL_MANGLING then 533 * passing certain @flags may have changed those standard protocol behaviors. 534 * Those flags are only for use with broken/nonconforming slaves, and with 535 * adapters which are known to support the specific mangling options they 536 * need (one or more of IGNORE_NAK, NO_RD_ACK, NOSTART, and REV_DIR_ADDR). 537 */ 538 struct i2c_msg { 539 __u16 addr; /* slave address */ 540 __u16 flags; 541 #define I2C_M_TEN 0x0010 /* this is a ten bit chip address */ 542 #define I2C_M_RD 0x0001 /* read data, from slave to master */ 543 #define I2C_M_NOSTART 0x4000 /* if I2C_FUNC_PROTOCOL_MANGLING */ 544 #define I2C_M_REV_DIR_ADDR 0x2000 /* if I2C_FUNC_PROTOCOL_MANGLING */ 545 #define I2C_M_IGNORE_NAK 0x1000 /* if I2C_FUNC_PROTOCOL_MANGLING */ 546 #define I2C_M_NO_RD_ACK 0x0800 /* if I2C_FUNC_PROTOCOL_MANGLING */ 547 #define I2C_M_RECV_LEN 0x0400 /* length will be first received byte */ 548 __u16 len; /* msg length */ 549 __u8 *buf; /* pointer to msg data */ 550 }; 551 552 /* To determine what functionality is present */ 553 554 #define I2C_FUNC_I2C 0x00000001 555 #define I2C_FUNC_10BIT_ADDR 0x00000002 556 #define I2C_FUNC_PROTOCOL_MANGLING 0x00000004 /* I2C_M_NOSTART etc. */ 557 #define I2C_FUNC_SMBUS_PEC 0x00000008 558 #define I2C_FUNC_SMBUS_BLOCK_PROC_CALL 0x00008000 /* SMBus 2.0 */ 559 #define I2C_FUNC_SMBUS_QUICK 0x00010000 560 #define I2C_FUNC_SMBUS_READ_BYTE 0x00020000 561 #define I2C_FUNC_SMBUS_WRITE_BYTE 0x00040000 562 #define I2C_FUNC_SMBUS_READ_BYTE_DATA 0x00080000 563 #define I2C_FUNC_SMBUS_WRITE_BYTE_DATA 0x00100000 564 #define I2C_FUNC_SMBUS_READ_WORD_DATA 0x00200000 565 #define I2C_FUNC_SMBUS_WRITE_WORD_DATA 0x00400000 566 #define I2C_FUNC_SMBUS_PROC_CALL 0x00800000 567 #define I2C_FUNC_SMBUS_READ_BLOCK_DATA 0x01000000 568 #define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA 0x02000000 569 #define I2C_FUNC_SMBUS_READ_I2C_BLOCK 0x04000000 /* I2C-like block xfer */ 570 #define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK 0x08000000 /* w/ 1-byte reg. addr. */ 571 572 #define I2C_FUNC_SMBUS_BYTE (I2C_FUNC_SMBUS_READ_BYTE | \ 573 I2C_FUNC_SMBUS_WRITE_BYTE) 574 #define I2C_FUNC_SMBUS_BYTE_DATA (I2C_FUNC_SMBUS_READ_BYTE_DATA | \ 575 I2C_FUNC_SMBUS_WRITE_BYTE_DATA) 576 #define I2C_FUNC_SMBUS_WORD_DATA (I2C_FUNC_SMBUS_READ_WORD_DATA | \ 577 I2C_FUNC_SMBUS_WRITE_WORD_DATA) 578 #define I2C_FUNC_SMBUS_BLOCK_DATA (I2C_FUNC_SMBUS_READ_BLOCK_DATA | \ 579 I2C_FUNC_SMBUS_WRITE_BLOCK_DATA) 580 #define I2C_FUNC_SMBUS_I2C_BLOCK (I2C_FUNC_SMBUS_READ_I2C_BLOCK | \ 581 I2C_FUNC_SMBUS_WRITE_I2C_BLOCK) 582 583 #define I2C_FUNC_SMBUS_EMUL (I2C_FUNC_SMBUS_QUICK | \ 584 I2C_FUNC_SMBUS_BYTE | \ 585 I2C_FUNC_SMBUS_BYTE_DATA | \ 586 I2C_FUNC_SMBUS_WORD_DATA | \ 587 I2C_FUNC_SMBUS_PROC_CALL | \ 588 I2C_FUNC_SMBUS_WRITE_BLOCK_DATA | \ 589 I2C_FUNC_SMBUS_I2C_BLOCK | \ 590 I2C_FUNC_SMBUS_PEC) 591 592 /* 593 * Data for SMBus Messages 594 */ 595 #define I2C_SMBUS_BLOCK_MAX 32 /* As specified in SMBus standard */ 596 union i2c_smbus_data { 597 __u8 byte; 598 __u16 word; 599 __u8 block[I2C_SMBUS_BLOCK_MAX + 2]; /* block[0] is used for length */ 600 /* and one more for user-space compatibility */ 601 }; 602 603 /* i2c_smbus_xfer read or write markers */ 604 #define I2C_SMBUS_READ 1 605 #define I2C_SMBUS_WRITE 0 606 607 /* SMBus transaction types (size parameter in the above functions) 608 Note: these no longer correspond to the (arbitrary) PIIX4 internal codes! */ 609 #define I2C_SMBUS_QUICK 0 610 #define I2C_SMBUS_BYTE 1 611 #define I2C_SMBUS_BYTE_DATA 2 612 #define I2C_SMBUS_WORD_DATA 3 613 #define I2C_SMBUS_PROC_CALL 4 614 #define I2C_SMBUS_BLOCK_DATA 5 615 #define I2C_SMBUS_I2C_BLOCK_BROKEN 6 616 #define I2C_SMBUS_BLOCK_PROC_CALL 7 /* SMBus 2.0 */ 617 #define I2C_SMBUS_I2C_BLOCK_DATA 8 618 619 #endif /* _LINUX_I2C_H */ 620