1 /* ------------------------------------------------------------------------- */
2 /* */
3 /* i2c.h - definitions for the i2c-bus interface */
4 /* */
5 /* ------------------------------------------------------------------------- */
6 /* Copyright (C) 1995-2000 Simon G. Vogl
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
21 /* ------------------------------------------------------------------------- */
22
23 /* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and
24 Frodo Looijaard <frodol@dds.nl> */
25
26 #ifndef _LINUX_I2C_H
27 #define _LINUX_I2C_H
28
29 #include <linux/types.h>
30 #ifdef __KERNEL__
31 #include <linux/mod_devicetable.h>
32 #include <linux/device.h> /* for struct device */
33 #include <linux/sched.h> /* for completion */
34 #include <linux/mutex.h>
35 #include <linux/of.h> /* for struct device_node */
36 #include <linux/swab.h> /* for swab16 */
37
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 struct module;
52
53 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
54 /*
55 * The master routines are the ones normally used to transmit data to devices
56 * on a bus (or read from them). Apart from two basic transfer functions to
57 * transmit one message at a time, a more complex version can be used to
58 * transmit an arbitrary number of messages without interruption.
59 * @count must be be less than 64k since msg.len is u16.
60 */
61 extern int i2c_master_send(const struct i2c_client *client, const char *buf,
62 int count);
63 extern int i2c_master_recv(const struct i2c_client *client, char *buf,
64 int count);
65
66 /* Transfer num messages.
67 */
68 extern int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
69 int num);
70
71 /* This is the very generalized SMBus access routine. You probably do not
72 want to use this, though; one of the functions below may be much easier,
73 and probably just as fast.
74 Note that we use i2c_adapter here, because you do not need a specific
75 smbus adapter to call this function. */
76 extern s32 i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr,
77 unsigned short flags, char read_write, u8 command,
78 int size, union i2c_smbus_data *data);
79
80 /* Now follow the 'nice' access routines. These also document the calling
81 conventions of i2c_smbus_xfer. */
82
83 extern s32 i2c_smbus_read_byte(const struct i2c_client *client);
84 extern s32 i2c_smbus_write_byte(const struct i2c_client *client, u8 value);
85 extern s32 i2c_smbus_read_byte_data(const struct i2c_client *client,
86 u8 command);
87 extern s32 i2c_smbus_write_byte_data(const struct i2c_client *client,
88 u8 command, u8 value);
89 extern s32 i2c_smbus_read_word_data(const struct i2c_client *client,
90 u8 command);
91 extern s32 i2c_smbus_write_word_data(const struct i2c_client *client,
92 u8 command, u16 value);
93
94 static inline s32
i2c_smbus_read_word_swapped(const struct i2c_client * client,u8 command)95 i2c_smbus_read_word_swapped(const struct i2c_client *client, u8 command)
96 {
97 s32 value = i2c_smbus_read_word_data(client, command);
98
99 return (value < 0) ? value : swab16(value);
100 }
101
102 static inline s32
i2c_smbus_write_word_swapped(const struct i2c_client * client,u8 command,u16 value)103 i2c_smbus_write_word_swapped(const struct i2c_client *client,
104 u8 command, u16 value)
105 {
106 return i2c_smbus_write_word_data(client, command, swab16(value));
107 }
108
109 /* Returns the number of read bytes */
110 extern s32 i2c_smbus_read_block_data(const struct i2c_client *client,
111 u8 command, u8 *values);
112 extern s32 i2c_smbus_write_block_data(const struct i2c_client *client,
113 u8 command, u8 length, const u8 *values);
114 /* Returns the number of read bytes */
115 extern s32 i2c_smbus_read_i2c_block_data(const struct i2c_client *client,
116 u8 command, u8 length, u8 *values);
117 extern s32 i2c_smbus_write_i2c_block_data(const struct i2c_client *client,
118 u8 command, u8 length,
119 const u8 *values);
120 #endif /* I2C */
121
122 /**
123 * struct i2c_driver - represent an I2C device driver
124 * @class: What kind of i2c device we instantiate (for detect)
125 * @attach_adapter: Callback for bus addition (deprecated)
126 * @detach_adapter: Callback for bus removal (deprecated)
127 * @probe: Callback for device binding
128 * @remove: Callback for device unbinding
129 * @shutdown: Callback for device shutdown
130 * @suspend: Callback for device suspend
131 * @resume: Callback for device resume
132 * @alert: Alert callback, for example for the SMBus alert protocol
133 * @command: Callback for bus-wide signaling (optional)
134 * @driver: Device driver model driver
135 * @id_table: List of I2C devices supported by this driver
136 * @detect: Callback for device detection
137 * @address_list: The I2C addresses to probe (for detect)
138 * @clients: List of detected clients we created (for i2c-core use only)
139 *
140 * The driver.owner field should be set to the module owner of this driver.
141 * The driver.name field should be set to the name of this driver.
142 *
143 * For automatic device detection, both @detect and @address_data must
144 * be defined. @class should also be set, otherwise only devices forced
145 * with module parameters will be created. The detect function must
146 * fill at least the name field of the i2c_board_info structure it is
147 * handed upon successful detection, and possibly also the flags field.
148 *
149 * If @detect is missing, the driver will still work fine for enumerated
150 * devices. Detected devices simply won't be supported. This is expected
151 * for the many I2C/SMBus devices which can't be detected reliably, and
152 * the ones which can always be enumerated in practice.
153 *
154 * The i2c_client structure which is handed to the @detect callback is
155 * not a real i2c_client. It is initialized just enough so that you can
156 * call i2c_smbus_read_byte_data and friends on it. Don't do anything
157 * else with it. In particular, calling dev_dbg and friends on it is
158 * not allowed.
159 */
160 struct i2c_driver {
161 unsigned int class;
162
163 /* Notifies the driver that a new bus has appeared or is about to be
164 * removed. You should avoid using this, it will be removed in a
165 * near future.
166 */
167 int (*attach_adapter)(struct i2c_adapter *) __deprecated;
168 int (*detach_adapter)(struct i2c_adapter *) __deprecated;
169
170 /* Standard driver model interfaces */
171 int (*probe)(struct i2c_client *, const struct i2c_device_id *);
172 int (*remove)(struct i2c_client *);
173
174 /* driver model interfaces that don't relate to enumeration */
175 void (*shutdown)(struct i2c_client *);
176 int (*suspend)(struct i2c_client *, pm_message_t mesg);
177 int (*resume)(struct i2c_client *);
178
179 /* Alert callback, for example for the SMBus alert protocol.
180 * The format and meaning of the data value depends on the protocol.
181 * For the SMBus alert protocol, there is a single bit of data passed
182 * as the alert response's low bit ("event flag").
183 */
184 void (*alert)(struct i2c_client *, unsigned int data);
185
186 /* a ioctl like command that can be used to perform specific functions
187 * with the device.
188 */
189 int (*command)(struct i2c_client *client, unsigned int cmd, void *arg);
190
191 struct device_driver driver;
192 const struct i2c_device_id *id_table;
193
194 /* Device detection callback for automatic device creation */
195 int (*detect)(struct i2c_client *, struct i2c_board_info *);
196 const unsigned short *address_list;
197 struct list_head clients;
198 };
199 #define to_i2c_driver(d) container_of(d, struct i2c_driver, driver)
200
201 /**
202 * struct i2c_client - represent an I2C slave device
203 * @flags: I2C_CLIENT_TEN indicates the device uses a ten bit chip address;
204 * I2C_CLIENT_PEC indicates it uses SMBus Packet Error Checking
205 * @addr: Address used on the I2C bus connected to the parent adapter.
206 * @name: Indicates the type of the device, usually a chip name that's
207 * generic enough to hide second-sourcing and compatible revisions.
208 * @adapter: manages the bus segment hosting this I2C device
209 * @driver: device's driver, hence pointer to access routines
210 * @dev: Driver model device node for the slave.
211 * @irq: indicates the IRQ generated by this device (if any)
212 * @detected: member of an i2c_driver.clients list or i2c-core's
213 * userspace_devices list
214 *
215 * An i2c_client identifies a single device (i.e. chip) connected to an
216 * i2c bus. The behaviour exposed to Linux is defined by the driver
217 * managing the device.
218 */
219 struct i2c_client {
220 unsigned short flags; /* div., see below */
221 unsigned short addr; /* chip address - NOTE: 7bit */
222 /* addresses are stored in the */
223 /* _LOWER_ 7 bits */
224 char name[I2C_NAME_SIZE];
225 struct i2c_adapter *adapter; /* the adapter we sit on */
226 struct i2c_driver *driver; /* and our access routines */
227 struct device dev; /* the device structure */
228 int irq; /* irq issued by device */
229 struct list_head detected;
230 };
231 #define to_i2c_client(d) container_of(d, struct i2c_client, dev)
232
233 extern struct i2c_client *i2c_verify_client(struct device *dev);
234
kobj_to_i2c_client(struct kobject * kobj)235 static inline struct i2c_client *kobj_to_i2c_client(struct kobject *kobj)
236 {
237 struct device * const dev = container_of(kobj, struct device, kobj);
238 return to_i2c_client(dev);
239 }
240
i2c_get_clientdata(const struct i2c_client * dev)241 static inline void *i2c_get_clientdata(const struct i2c_client *dev)
242 {
243 return dev_get_drvdata(&dev->dev);
244 }
245
i2c_set_clientdata(struct i2c_client * dev,void * data)246 static inline void i2c_set_clientdata(struct i2c_client *dev, void *data)
247 {
248 dev_set_drvdata(&dev->dev, data);
249 }
250
251 /**
252 * struct i2c_board_info - template for device creation
253 * @type: chip type, to initialize i2c_client.name
254 * @flags: to initialize i2c_client.flags
255 * @addr: stored in i2c_client.addr
256 * @platform_data: stored in i2c_client.dev.platform_data
257 * @archdata: copied into i2c_client.dev.archdata
258 * @of_node: pointer to OpenFirmware device node
259 * @irq: stored in i2c_client.irq
260 *
261 * I2C doesn't actually support hardware probing, although controllers and
262 * devices may be able to use I2C_SMBUS_QUICK to tell whether or not there's
263 * a device at a given address. Drivers commonly need more information than
264 * that, such as chip type, configuration, associated IRQ, and so on.
265 *
266 * i2c_board_info is used to build tables of information listing I2C devices
267 * that are present. This information is used to grow the driver model tree.
268 * For mainboards this is done statically using i2c_register_board_info();
269 * bus numbers identify adapters that aren't yet available. For add-on boards,
270 * i2c_new_device() does this dynamically with the adapter already known.
271 */
272 struct i2c_board_info {
273 char type[I2C_NAME_SIZE];
274 unsigned short flags;
275 unsigned short addr;
276 void *platform_data;
277 struct dev_archdata *archdata;
278 struct device_node *of_node;
279 int irq;
280 };
281
282 /**
283 * I2C_BOARD_INFO - macro used to list an i2c device and its address
284 * @dev_type: identifies the device type
285 * @dev_addr: the device's address on the bus.
286 *
287 * This macro initializes essential fields of a struct i2c_board_info,
288 * declaring what has been provided on a particular board. Optional
289 * fields (such as associated irq, or device-specific platform_data)
290 * are provided using conventional syntax.
291 */
292 #define I2C_BOARD_INFO(dev_type, dev_addr) \
293 .type = dev_type, .addr = (dev_addr)
294
295
296 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
297 /* Add-on boards should register/unregister their devices; e.g. a board
298 * with integrated I2C, a config eeprom, sensors, and a codec that's
299 * used in conjunction with the primary hardware.
300 */
301 extern struct i2c_client *
302 i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info);
303
304 /* If you don't know the exact address of an I2C device, use this variant
305 * instead, which can probe for device presence in a list of possible
306 * addresses. The "probe" callback function is optional. If it is provided,
307 * it must return 1 on successful probe, 0 otherwise. If it is not provided,
308 * a default probing method is used.
309 */
310 extern struct i2c_client *
311 i2c_new_probed_device(struct i2c_adapter *adap,
312 struct i2c_board_info *info,
313 unsigned short const *addr_list,
314 int (*probe)(struct i2c_adapter *, unsigned short addr));
315
316 /* Common custom probe functions */
317 extern int i2c_probe_func_quick_read(struct i2c_adapter *, unsigned short addr);
318
319 /* For devices that use several addresses, use i2c_new_dummy() to make
320 * client handles for the extra addresses.
321 */
322 extern struct i2c_client *
323 i2c_new_dummy(struct i2c_adapter *adap, u16 address);
324
325 extern void i2c_unregister_device(struct i2c_client *);
326 #endif /* I2C */
327
328 /* Mainboard arch_initcall() code should register all its I2C devices.
329 * This is done at arch_initcall time, before declaring any i2c adapters.
330 * Modules for add-on boards must use other calls.
331 */
332 #ifdef CONFIG_I2C_BOARDINFO
333 extern int
334 i2c_register_board_info(int busnum, struct i2c_board_info const *info,
335 unsigned n);
336 #else
337 static inline int
i2c_register_board_info(int busnum,struct i2c_board_info const * info,unsigned n)338 i2c_register_board_info(int busnum, struct i2c_board_info const *info,
339 unsigned n)
340 {
341 return 0;
342 }
343 #endif /* I2C_BOARDINFO */
344
345 /*
346 * The following structs are for those who like to implement new bus drivers:
347 * i2c_algorithm is the interface to a class of hardware solutions which can
348 * be addressed using the same bus algorithms - i.e. bit-banging or the PCF8584
349 * to name two of the most common.
350 */
351 struct i2c_algorithm {
352 /* If an adapter algorithm can't do I2C-level access, set master_xfer
353 to NULL. If an adapter algorithm can do SMBus access, set
354 smbus_xfer. If set to NULL, the SMBus protocol is simulated
355 using common I2C messages */
356 /* master_xfer should return the number of messages successfully
357 processed, or a negative value on error */
358 int (*master_xfer)(struct i2c_adapter *adap, struct i2c_msg *msgs,
359 int num);
360 int (*smbus_xfer) (struct i2c_adapter *adap, u16 addr,
361 unsigned short flags, char read_write,
362 u8 command, int size, union i2c_smbus_data *data);
363
364 /* To determine what the adapter supports */
365 u32 (*functionality) (struct i2c_adapter *);
366 };
367
368 /*
369 * i2c_adapter is the structure used to identify a physical i2c bus along
370 * with the access algorithms necessary to access it.
371 */
372 struct i2c_adapter {
373 struct module *owner;
374 unsigned int class; /* classes to allow probing for */
375 const struct i2c_algorithm *algo; /* the algorithm to access the bus */
376 void *algo_data;
377
378 /* data fields that are valid for all devices */
379 struct rt_mutex bus_lock;
380
381 int timeout; /* in jiffies */
382 int retries;
383 struct device dev; /* the adapter device */
384
385 int nr;
386 char name[48];
387 struct completion dev_released;
388
389 struct mutex userspace_clients_lock;
390 struct list_head userspace_clients;
391 };
392 #define to_i2c_adapter(d) container_of(d, struct i2c_adapter, dev)
393
i2c_get_adapdata(const struct i2c_adapter * dev)394 static inline void *i2c_get_adapdata(const struct i2c_adapter *dev)
395 {
396 return dev_get_drvdata(&dev->dev);
397 }
398
i2c_set_adapdata(struct i2c_adapter * dev,void * data)399 static inline void i2c_set_adapdata(struct i2c_adapter *dev, void *data)
400 {
401 dev_set_drvdata(&dev->dev, data);
402 }
403
404 static inline struct i2c_adapter *
i2c_parent_is_i2c_adapter(const struct i2c_adapter * adapter)405 i2c_parent_is_i2c_adapter(const struct i2c_adapter *adapter)
406 {
407 struct device *parent = adapter->dev.parent;
408
409 if (parent != NULL && parent->type == &i2c_adapter_type)
410 return to_i2c_adapter(parent);
411 else
412 return NULL;
413 }
414
415 int i2c_for_each_dev(void *data, int (*fn)(struct device *, void *));
416
417 /* Adapter locking functions, exported for shared pin cases */
418 void i2c_lock_adapter(struct i2c_adapter *);
419 void i2c_unlock_adapter(struct i2c_adapter *);
420
421 /*flags for the client struct: */
422 #define I2C_CLIENT_PEC 0x04 /* Use Packet Error Checking */
423 #define I2C_CLIENT_TEN 0x10 /* we have a ten bit chip address */
424 /* Must equal I2C_M_TEN below */
425 #define I2C_CLIENT_WAKE 0x80 /* for board_info; true iff can wake */
426
427 /* i2c adapter classes (bitmask) */
428 #define I2C_CLASS_HWMON (1<<0) /* lm_sensors, ... */
429 #define I2C_CLASS_DDC (1<<3) /* DDC bus on graphics adapters */
430 #define I2C_CLASS_SPD (1<<7) /* Memory modules */
431
432 /* Internal numbers to terminate lists */
433 #define I2C_CLIENT_END 0xfffeU
434
435 /* Construct an I2C_CLIENT_END-terminated array of i2c addresses */
436 #define I2C_ADDRS(addr, addrs...) \
437 ((const unsigned short []){ addr, ## addrs, I2C_CLIENT_END })
438
439
440 /* ----- functions exported by i2c.o */
441
442 /* administration...
443 */
444 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
445 extern int i2c_add_adapter(struct i2c_adapter *);
446 extern int i2c_del_adapter(struct i2c_adapter *);
447 extern int i2c_add_numbered_adapter(struct i2c_adapter *);
448
449 extern int i2c_register_driver(struct module *, struct i2c_driver *);
450 extern void i2c_del_driver(struct i2c_driver *);
451
452 /* use a define to avoid include chaining to get THIS_MODULE */
453 #define i2c_add_driver(driver) \
454 i2c_register_driver(THIS_MODULE, driver)
455
456 extern struct i2c_client *i2c_use_client(struct i2c_client *client);
457 extern void i2c_release_client(struct i2c_client *client);
458
459 /* call the i2c_client->command() of all attached clients with
460 * the given arguments */
461 extern void i2c_clients_command(struct i2c_adapter *adap,
462 unsigned int cmd, void *arg);
463
464 extern struct i2c_adapter *i2c_get_adapter(int nr);
465 extern void i2c_put_adapter(struct i2c_adapter *adap);
466
467
468 /* Return the functionality mask */
i2c_get_functionality(struct i2c_adapter * adap)469 static inline u32 i2c_get_functionality(struct i2c_adapter *adap)
470 {
471 return adap->algo->functionality(adap);
472 }
473
474 /* Return 1 if adapter supports everything we need, 0 if not. */
i2c_check_functionality(struct i2c_adapter * adap,u32 func)475 static inline int i2c_check_functionality(struct i2c_adapter *adap, u32 func)
476 {
477 return (func & i2c_get_functionality(adap)) == func;
478 }
479
480 /* Return the adapter number for a specific adapter */
i2c_adapter_id(struct i2c_adapter * adap)481 static inline int i2c_adapter_id(struct i2c_adapter *adap)
482 {
483 return adap->nr;
484 }
485
486 /**
487 * module_i2c_driver() - Helper macro for registering a I2C driver
488 * @__i2c_driver: i2c_driver struct
489 *
490 * Helper macro for I2C drivers which do not do anything special in module
491 * init/exit. This eliminates a lot of boilerplate. Each module may only
492 * use this macro once, and calling it replaces module_init() and module_exit()
493 */
494 #define module_i2c_driver(__i2c_driver) \
495 module_driver(__i2c_driver, i2c_add_driver, \
496 i2c_del_driver)
497
498 #endif /* I2C */
499 #endif /* __KERNEL__ */
500
501 /**
502 * struct i2c_msg - an I2C transaction segment beginning with START
503 * @addr: Slave address, either seven or ten bits. When this is a ten
504 * bit address, I2C_M_TEN must be set in @flags and the adapter
505 * must support I2C_FUNC_10BIT_ADDR.
506 * @flags: I2C_M_RD is handled by all adapters. No other flags may be
507 * provided unless the adapter exported the relevant I2C_FUNC_*
508 * flags through i2c_check_functionality().
509 * @len: Number of data bytes in @buf being read from or written to the
510 * I2C slave address. For read transactions where I2C_M_RECV_LEN
511 * is set, the caller guarantees that this buffer can hold up to
512 * 32 bytes in addition to the initial length byte sent by the
513 * slave (plus, if used, the SMBus PEC); and this value will be
514 * incremented by the number of block data bytes received.
515 * @buf: The buffer into which data is read, or from which it's written.
516 *
517 * An i2c_msg is the low level representation of one segment of an I2C
518 * transaction. It is visible to drivers in the @i2c_transfer() procedure,
519 * to userspace from i2c-dev, and to I2C adapter drivers through the
520 * @i2c_adapter.@master_xfer() method.
521 *
522 * Except when I2C "protocol mangling" is used, all I2C adapters implement
523 * the standard rules for I2C transactions. Each transaction begins with a
524 * START. That is followed by the slave address, and a bit encoding read
525 * versus write. Then follow all the data bytes, possibly including a byte
526 * with SMBus PEC. The transfer terminates with a NAK, or when all those
527 * bytes have been transferred and ACKed. If this is the last message in a
528 * group, it is followed by a STOP. Otherwise it is followed by the next
529 * @i2c_msg transaction segment, beginning with a (repeated) START.
530 *
531 * Alternatively, when the adapter supports I2C_FUNC_PROTOCOL_MANGLING then
532 * passing certain @flags may have changed those standard protocol behaviors.
533 * Those flags are only for use with broken/nonconforming slaves, and with
534 * adapters which are known to support the specific mangling options they
535 * need (one or more of IGNORE_NAK, NO_RD_ACK, NOSTART, and REV_DIR_ADDR).
536 */
537 struct i2c_msg {
538 __u16 addr; /* slave address */
539 __u16 flags;
540 #define I2C_M_TEN 0x0010 /* this is a ten bit chip address */
541 #define I2C_M_RD 0x0001 /* read data, from slave to master */
542 #define I2C_M_NOSTART 0x4000 /* if I2C_FUNC_PROTOCOL_MANGLING */
543 #define I2C_M_REV_DIR_ADDR 0x2000 /* if I2C_FUNC_PROTOCOL_MANGLING */
544 #define I2C_M_IGNORE_NAK 0x1000 /* if I2C_FUNC_PROTOCOL_MANGLING */
545 #define I2C_M_NO_RD_ACK 0x0800 /* if I2C_FUNC_PROTOCOL_MANGLING */
546 #define I2C_M_RECV_LEN 0x0400 /* length will be first received byte */
547 __u16 len; /* msg length */
548 __u8 *buf; /* pointer to msg data */
549 };
550
551 /* To determine what functionality is present */
552
553 #define I2C_FUNC_I2C 0x00000001
554 #define I2C_FUNC_10BIT_ADDR 0x00000002
555 #define I2C_FUNC_PROTOCOL_MANGLING 0x00000004 /* I2C_M_NOSTART etc. */
556 #define I2C_FUNC_SMBUS_PEC 0x00000008
557 #define I2C_FUNC_SMBUS_BLOCK_PROC_CALL 0x00008000 /* SMBus 2.0 */
558 #define I2C_FUNC_SMBUS_QUICK 0x00010000
559 #define I2C_FUNC_SMBUS_READ_BYTE 0x00020000
560 #define I2C_FUNC_SMBUS_WRITE_BYTE 0x00040000
561 #define I2C_FUNC_SMBUS_READ_BYTE_DATA 0x00080000
562 #define I2C_FUNC_SMBUS_WRITE_BYTE_DATA 0x00100000
563 #define I2C_FUNC_SMBUS_READ_WORD_DATA 0x00200000
564 #define I2C_FUNC_SMBUS_WRITE_WORD_DATA 0x00400000
565 #define I2C_FUNC_SMBUS_PROC_CALL 0x00800000
566 #define I2C_FUNC_SMBUS_READ_BLOCK_DATA 0x01000000
567 #define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA 0x02000000
568 #define I2C_FUNC_SMBUS_READ_I2C_BLOCK 0x04000000 /* I2C-like block xfer */
569 #define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK 0x08000000 /* w/ 1-byte reg. addr. */
570
571 #define I2C_FUNC_SMBUS_BYTE (I2C_FUNC_SMBUS_READ_BYTE | \
572 I2C_FUNC_SMBUS_WRITE_BYTE)
573 #define I2C_FUNC_SMBUS_BYTE_DATA (I2C_FUNC_SMBUS_READ_BYTE_DATA | \
574 I2C_FUNC_SMBUS_WRITE_BYTE_DATA)
575 #define I2C_FUNC_SMBUS_WORD_DATA (I2C_FUNC_SMBUS_READ_WORD_DATA | \
576 I2C_FUNC_SMBUS_WRITE_WORD_DATA)
577 #define I2C_FUNC_SMBUS_BLOCK_DATA (I2C_FUNC_SMBUS_READ_BLOCK_DATA | \
578 I2C_FUNC_SMBUS_WRITE_BLOCK_DATA)
579 #define I2C_FUNC_SMBUS_I2C_BLOCK (I2C_FUNC_SMBUS_READ_I2C_BLOCK | \
580 I2C_FUNC_SMBUS_WRITE_I2C_BLOCK)
581
582 #define I2C_FUNC_SMBUS_EMUL (I2C_FUNC_SMBUS_QUICK | \
583 I2C_FUNC_SMBUS_BYTE | \
584 I2C_FUNC_SMBUS_BYTE_DATA | \
585 I2C_FUNC_SMBUS_WORD_DATA | \
586 I2C_FUNC_SMBUS_PROC_CALL | \
587 I2C_FUNC_SMBUS_WRITE_BLOCK_DATA | \
588 I2C_FUNC_SMBUS_I2C_BLOCK | \
589 I2C_FUNC_SMBUS_PEC)
590
591 /*
592 * Data for SMBus Messages
593 */
594 #define I2C_SMBUS_BLOCK_MAX 32 /* As specified in SMBus standard */
595 union i2c_smbus_data {
596 __u8 byte;
597 __u16 word;
598 __u8 block[I2C_SMBUS_BLOCK_MAX + 2]; /* block[0] is used for length */
599 /* and one more for user-space compatibility */
600 };
601
602 /* i2c_smbus_xfer read or write markers */
603 #define I2C_SMBUS_READ 1
604 #define I2C_SMBUS_WRITE 0
605
606 /* SMBus transaction types (size parameter in the above functions)
607 Note: these no longer correspond to the (arbitrary) PIIX4 internal codes! */
608 #define I2C_SMBUS_QUICK 0
609 #define I2C_SMBUS_BYTE 1
610 #define I2C_SMBUS_BYTE_DATA 2
611 #define I2C_SMBUS_WORD_DATA 3
612 #define I2C_SMBUS_PROC_CALL 4
613 #define I2C_SMBUS_BLOCK_DATA 5
614 #define I2C_SMBUS_I2C_BLOCK_BROKEN 6
615 #define I2C_SMBUS_BLOCK_PROC_CALL 7 /* SMBus 2.0 */
616 #define I2C_SMBUS_I2C_BLOCK_DATA 8
617
618 #endif /* _LINUX_I2C_H */
619