Line data Source code
1 : /* ------------------------------------------------------------------------- */
2 : /* */
3 : /* i2c.h - definitions for the i2c-bus interface */
4 : /* */
5 : /* ------------------------------------------------------------------------- */
6 : /* Copyright (C) 1995-2000 Simon G. Vogl
7 :
8 : This program is free software; you can redistribute it and/or modify
9 : it under the terms of the GNU General Public License as published by
10 : the Free Software Foundation; either version 2 of the License, or
11 : (at your option) any later version.
12 :
13 : This program is distributed in the hope that it will be useful,
14 : but WITHOUT ANY WARRANTY; without even the implied warranty of
15 : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 : GNU General Public License for more details.
17 :
18 : You should have received a copy of the GNU General Public License
19 : along with this program; if not, write to the Free Software
20 : Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
21 : /* ------------------------------------------------------------------------- */
22 :
23 : /* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and
24 : Frodo Looijaard <frodol@dds.nl> */
25 :
26 : #ifndef _LINUX_I2C_H
27 : #define _LINUX_I2C_H
28 :
29 : #include <linux/types.h>
30 : #ifdef __KERNEL__
31 : #include <linux/module.h>
32 : #include <linux/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 :
38 1 : extern struct bus_type i2c_bus_type;
39 1 :
40 1 : /* --- General options ------------------------------------------------ */
41 1 :
42 1 : struct i2c_msg;
43 1 : struct i2c_algorithm;
44 1 : struct i2c_adapter;
45 1 : struct i2c_client;
46 : struct i2c_driver;
47 : union i2c_smbus_data;
48 : struct i2c_board_info;
49 :
50 : #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
51 : /*
52 : * The master routines are the ones normally used to transmit data to devices
53 : * on a bus (or read from them). Apart from two basic transfer functions to
54 : * transmit one message at a time, a more complex version can be used to
55 : * transmit an arbitrary number of messages without interruption.
56 : */
57 : extern int i2c_master_send(struct i2c_client *client, const char *buf,
58 : int count);
59 : extern int i2c_master_recv(struct i2c_client *client, char *buf, int count);
60 :
61 : /* Transfer num messages.
62 : */
63 : extern int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
64 : int num);
65 :
66 : /* This is the very generalized SMBus access routine. You probably do not
67 : want to use this, though; one of the functions below may be much easier,
68 : and probably just as fast.
69 : Note that we use i2c_adapter here, because you do not need a specific
70 : smbus adapter to call this function. */
71 : extern s32 i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr,
72 : unsigned short flags, char read_write, u8 command,
73 : int size, union i2c_smbus_data *data);
74 :
75 : /* Now follow the 'nice' access routines. These also document the calling
76 : conventions of i2c_smbus_xfer. */
77 :
78 : extern s32 i2c_smbus_read_byte(struct i2c_client *client);
79 : extern s32 i2c_smbus_write_byte(struct i2c_client *client, u8 value);
80 : extern s32 i2c_smbus_read_byte_data(struct i2c_client *client, u8 command);
81 : extern s32 i2c_smbus_write_byte_data(struct i2c_client *client,
82 : u8 command, u8 value);
83 : extern s32 i2c_smbus_read_word_data(struct i2c_client *client, u8 command);
84 : extern s32 i2c_smbus_write_word_data(struct i2c_client *client,
85 : u8 command, u16 value);
86 : /* Returns the number of read bytes */
87 : extern s32 i2c_smbus_read_block_data(struct i2c_client *client,
88 : u8 command, u8 *values);
89 : extern s32 i2c_smbus_write_block_data(struct i2c_client *client,
90 : u8 command, u8 length, const u8 *values);
91 : /* Returns the number of read bytes */
92 : extern s32 i2c_smbus_read_i2c_block_data(struct i2c_client *client,
93 : u8 command, u8 length, u8 *values);
94 : extern s32 i2c_smbus_write_i2c_block_data(struct i2c_client *client,
95 1 : u8 command, u8 length,
96 : const u8 *values);
97 : #endif /* I2C */
98 :
99 : /**
100 : * struct i2c_driver - represent an I2C device driver
101 : * @class: What kind of i2c device we instantiate (for detect)
102 : * @attach_adapter: Callback for bus addition (for legacy drivers)
103 : * @detach_adapter: Callback for bus removal (for legacy drivers)
104 : * @probe: Callback for device binding
105 : * @remove: Callback for device unbinding
106 : * @shutdown: Callback for device shutdown
107 : * @suspend: Callback for device suspend
108 : * @resume: Callback for device resume
109 : * @command: Callback for bus-wide signaling (optional)
110 : * @driver: Device driver model driver
111 : * @id_table: List of I2C devices supported by this driver
112 : * @detect: Callback for device detection
113 : * @address_list: The I2C addresses to probe (for detect)
114 : * @clients: List of detected clients we created (for i2c-core use only)
115 : *
116 : * The driver.owner field should be set to the module owner of this driver.
117 : * The driver.name field should be set to the name of this driver.
118 : *
119 : * For automatic device detection, both @detect and @address_data must
120 : * be defined. @class should also be set, otherwise only devices forced
121 : * with module parameters will be created. The detect function must
122 : * fill at least the name field of the i2c_board_info structure it is
123 : * handed upon successful detection, and possibly also the flags field.
124 : *
125 : * If @detect is missing, the driver will still work fine for enumerated
126 : * devices. Detected devices simply won't be supported. This is expected
127 : * for the many I2C/SMBus devices which can't be detected reliably, and
128 : * the ones which can always be enumerated in practice.
129 : *
130 : * The i2c_client structure which is handed to the @detect callback is
131 : * not a real i2c_client. It is initialized just enough so that you can
132 : * call i2c_smbus_read_byte_data and friends on it. Don't do anything
133 : * else with it. In particular, calling dev_dbg and friends on it is
134 : * not allowed.
135 : */
136 : struct i2c_driver {
137 : unsigned int class;
138 :
139 : /* Notifies the driver that a new bus has appeared or is about to be
140 : * removed. You should avoid using this if you can, it will probably
141 : * be removed in a near future.
142 : */
143 : int (*attach_adapter)(struct i2c_adapter *);
144 : int (*detach_adapter)(struct i2c_adapter *);
145 :
146 : /* Standard driver model interfaces */
147 : int (*probe)(struct i2c_client *, const struct i2c_device_id *);
148 : int (*remove)(struct i2c_client *);
149 :
150 : /* driver model interfaces that don't relate to enumeration */
151 : void (*shutdown)(struct i2c_client *);
152 : int (*suspend)(struct i2c_client *, pm_message_t mesg);
153 : int (*resume)(struct i2c_client *);
154 :
155 : /* a ioctl like command that can be used to perform specific functions
156 : * with the device.
157 : */
158 : int (*command)(struct i2c_client *client, unsigned int cmd, void *arg);
159 :
160 : struct device_driver driver;
161 : const struct i2c_device_id *id_table;
162 :
163 : /* Device detection callback for automatic device creation */
164 : int (*detect)(struct i2c_client *, struct i2c_board_info *);
165 : const unsigned short *address_list;
166 : struct list_head clients;
167 : };
168 1 : #define to_i2c_driver(d) container_of(d, struct i2c_driver, driver)
169 :
170 : /**
171 : * struct i2c_client - represent an I2C slave device
172 : * @flags: I2C_CLIENT_TEN indicates the device uses a ten bit chip address;
173 : * I2C_CLIENT_PEC indicates it uses SMBus Packet Error Checking
174 : * @addr: Address used on the I2C bus connected to the parent adapter.
175 : * @name: Indicates the type of the device, usually a chip name that's
176 : * generic enough to hide second-sourcing and compatible revisions.
177 : * @adapter: manages the bus segment hosting this I2C device
178 : * @driver: device's driver, hence pointer to access routines
179 : * @dev: Driver model device node for the slave.
180 : * @irq: indicates the IRQ generated by this device (if any)
181 : * @detected: member of an i2c_driver.clients list or i2c-core's
182 : * userspace_devices list
183 : *
184 : * An i2c_client identifies a single device (i.e. chip) connected to an
185 : * i2c bus. The behaviour exposed to Linux is defined by the driver
186 : * managing the device.
187 : */
188 : struct i2c_client {
189 : unsigned short flags; /* div., see below */
190 : unsigned short addr; /* chip address - NOTE: 7bit */
191 : /* addresses are stored in the */
192 : /* _LOWER_ 7 bits */
193 : char name[I2C_NAME_SIZE];
194 : struct i2c_adapter *adapter; /* the adapter we sit on */
195 : struct i2c_driver *driver; /* and our access routines */
196 : struct device dev; /* the device structure */
197 : int irq; /* irq issued by device */
198 : struct list_head detected;
199 : };
200 : #define to_i2c_client(d) container_of(d, struct i2c_client, dev)
201 :
202 : extern struct i2c_client *i2c_verify_client(struct device *dev);
203 :
204 : static inline struct i2c_client *kobj_to_i2c_client(struct kobject *kobj)
205 : {
206 : struct device * const dev = container_of(kobj, struct device, kobj);
207 : return to_i2c_client(dev);
208 : }
209 :
210 : static inline void *i2c_get_clientdata(const struct i2c_client *dev)
211 : {
212 : return dev_get_drvdata(&dev->dev);
213 : }
214 :
215 : static inline void i2c_set_clientdata(struct i2c_client *dev, void *data)
216 : {
217 : dev_set_drvdata(&dev->dev, data);
218 : }
219 1 :
220 : /**
221 : * struct i2c_board_info - template for device creation
222 : * @type: chip type, to initialize i2c_client.name
223 : * @flags: to initialize i2c_client.flags
224 : * @addr: stored in i2c_client.addr
225 : * @platform_data: stored in i2c_client.dev.platform_data
226 : * @archdata: copied into i2c_client.dev.archdata
227 : * @irq: stored in i2c_client.irq
228 : *
229 : * I2C doesn't actually support hardware probing, although controllers and
230 : * devices may be able to use I2C_SMBUS_QUICK to tell whether or not there's
231 : * a device at a given address. Drivers commonly need more information than
232 : * that, such as chip type, configuration, associated IRQ, and so on.
233 : *
234 : * i2c_board_info is used to build tables of information listing I2C devices
235 : * that are present. This information is used to grow the driver model tree.
236 : * For mainboards this is done statically using i2c_register_board_info();
237 : * bus numbers identify adapters that aren't yet available. For add-on boards,
238 : * i2c_new_device() does this dynamically with the adapter already known.
239 : */
240 : struct i2c_board_info {
241 : char type[I2C_NAME_SIZE];
242 : unsigned short flags;
243 : unsigned short addr;
244 : void *platform_data;
245 : struct dev_archdata *archdata;
246 : int irq;
247 : };
248 :
249 : /**
250 : * I2C_BOARD_INFO - macro used to list an i2c device and its address
251 : * @dev_type: identifies the device type
252 : * @dev_addr: the device's address on the bus.
253 : *
254 : * This macro initializes essential fields of a struct i2c_board_info,
255 : * declaring what has been provided on a particular board. Optional
256 : * fields (such as associated irq, or device-specific platform_data)
257 : * are provided using conventional syntax.
258 : */
259 : #define I2C_BOARD_INFO(dev_type, dev_addr) \
260 : .type = dev_type, .addr = (dev_addr)
261 :
262 :
263 : #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
264 : /* Add-on boards should register/unregister their devices; e.g. a board
265 : * with integrated I2C, a config eeprom, sensors, and a codec that's
266 : * used in conjunction with the primary hardware.
267 : */
268 : extern struct i2c_client *
269 : i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info);
270 :
271 : /* If you don't know the exact address of an I2C device, use this variant
272 : * instead, which can probe for device presence in a list of possible
273 : * addresses.
274 : */
275 : extern struct i2c_client *
276 : i2c_new_probed_device(struct i2c_adapter *adap,
277 : struct i2c_board_info *info,
278 : unsigned short const *addr_list);
279 :
280 : /* For devices that use several addresses, use i2c_new_dummy() to make
281 : * client handles for the extra addresses.
282 : */
283 : extern struct i2c_client *
284 : i2c_new_dummy(struct i2c_adapter *adap, u16 address);
285 :
286 : extern void i2c_unregister_device(struct i2c_client *);
287 : #endif /* I2C */
288 :
289 : /* Mainboard arch_initcall() code should register all its I2C devices.
290 : * This is done at arch_initcall time, before declaring any i2c adapters.
291 : * Modules for add-on boards must use other calls.
292 : */
293 : #ifdef CONFIG_I2C_BOARDINFO
294 : extern int
295 : i2c_register_board_info(int busnum, struct i2c_board_info const *info,
296 1 : unsigned n);
297 : #else
298 : static inline int
299 : i2c_register_board_info(int busnum, struct i2c_board_info const *info,
300 : unsigned n)
301 : {
302 : return 0;
303 : }
304 : #endif /* I2C_BOARDINFO */
305 :
306 : /*
307 : * The following structs are for those who like to implement new bus drivers:
308 : * i2c_algorithm is the interface to a class of hardware solutions which can
309 : * be addressed using the same bus algorithms - i.e. bit-banging or the PCF8584
310 : * to name two of the most common.
311 : */
312 : struct i2c_algorithm {
313 : /* If an adapter algorithm can't do I2C-level access, set master_xfer
314 : to NULL. If an adapter algorithm can do SMBus access, set
315 : smbus_xfer. If set to NULL, the SMBus protocol is simulated
316 : using common I2C messages */
317 : /* master_xfer should return the number of messages successfully
318 : processed, or a negative value on error */
319 : int (*master_xfer)(struct i2c_adapter *adap, struct i2c_msg *msgs,
320 : int num);
321 : int (*smbus_xfer) (struct i2c_adapter *adap, u16 addr,
322 : unsigned short flags, char read_write,
323 : u8 command, int size, union i2c_smbus_data *data);
324 :
325 : /* To determine what the adapter supports */
326 : u32 (*functionality) (struct i2c_adapter *);
327 : };
328 1 :
329 : /*
330 : * i2c_adapter is the structure used to identify a physical i2c bus along
331 : * with the access algorithms necessary to access it.
332 : */
333 : struct i2c_adapter {
334 : struct module *owner;
335 : unsigned int id;
336 : unsigned int class; /* classes to allow probing for */
337 : const struct i2c_algorithm *algo; /* the algorithm to access the bus */
338 : void *algo_data;
339 :
340 : /* data fields that are valid for all devices */
341 : struct rt_mutex bus_lock;
342 :
343 : int timeout; /* in jiffies */
344 : int retries;
345 : struct device dev; /* the adapter device */
346 :
347 : int nr;
348 : char name[48];
349 : struct completion dev_released;
350 : };
351 : #define to_i2c_adapter(d) container_of(d, struct i2c_adapter, dev)
352 :
353 : static inline void *i2c_get_adapdata(const struct i2c_adapter *dev)
354 : {
355 : return dev_get_drvdata(&dev->dev);
356 : }
357 :
358 : static inline void i2c_set_adapdata(struct i2c_adapter *dev, void *data)
359 : {
360 : dev_set_drvdata(&dev->dev, data);
361 : }
362 :
363 : /**
364 : * i2c_lock_adapter - Prevent access to an I2C bus segment
365 : * @adapter: Target I2C bus segment
366 : */
367 : static inline void i2c_lock_adapter(struct i2c_adapter *adapter)
368 : {
369 : rt_mutex_lock(&adapter->bus_lock);
370 : }
371 :
372 : /**
373 : * i2c_unlock_adapter - Reauthorize access to an I2C bus segment
374 : * @adapter: Target I2C bus segment
375 : */
376 : static inline void i2c_unlock_adapter(struct i2c_adapter *adapter)
377 : {
378 : rt_mutex_unlock(&adapter->bus_lock);
379 : }
380 :
381 : /*flags for the client struct: */
382 : #define I2C_CLIENT_PEC 0x04 /* Use Packet Error Checking */
383 : #define I2C_CLIENT_TEN 0x10 /* we have a ten bit chip address */
384 : /* Must equal I2C_M_TEN below */
385 : #define I2C_CLIENT_WAKE 0x80 /* for board_info; true iff can wake */
386 :
387 : /* i2c adapter classes (bitmask) */
388 : #define I2C_CLASS_HWMON (1<<0) /* lm_sensors, ... */
389 : #define I2C_CLASS_TV_ANALOG (1<<1) /* bttv + friends */
390 : #define I2C_CLASS_TV_DIGITAL (1<<2) /* dvb cards */
391 : #define I2C_CLASS_DDC (1<<3) /* DDC bus on graphics adapters */
392 : #define I2C_CLASS_SPD (1<<7) /* SPD EEPROMs and similar */
393 :
394 : /* Internal numbers to terminate lists */
395 : #define I2C_CLIENT_END 0xfffeU
396 :
397 : /* The numbers to use to set I2C bus address */
398 : #define ANY_I2C_BUS 0xffff
399 :
400 : /* Construct an I2C_CLIENT_END-terminated array of i2c addresses */
401 : #define I2C_ADDRS(addr, addrs...) \
402 : ((const unsigned short []){ addr, ## addrs, I2C_CLIENT_END })
403 :
404 :
405 : /* ----- functions exported by i2c.o */
406 :
407 : /* administration...
408 : */
409 : #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
410 : extern int i2c_add_adapter(struct i2c_adapter *);
411 : extern int i2c_del_adapter(struct i2c_adapter *);
412 : extern int i2c_add_numbered_adapter(struct i2c_adapter *);
413 :
414 : extern int i2c_register_driver(struct module *, struct i2c_driver *);
415 : extern void i2c_del_driver(struct i2c_driver *);
416 :
417 : static inline int i2c_add_driver(struct i2c_driver *driver)
418 : {
419 5 : return i2c_register_driver(THIS_MODULE, driver);
420 : }
421 :
422 : extern struct i2c_client *i2c_use_client(struct i2c_client *client);
423 : extern void i2c_release_client(struct i2c_client *client);
424 :
425 : /* call the i2c_client->command() of all attached clients with
426 : * the given arguments */
427 : extern void i2c_clients_command(struct i2c_adapter *adap,
428 : unsigned int cmd, void *arg);
429 :
430 : extern struct i2c_adapter *i2c_get_adapter(int id);
431 : extern void i2c_put_adapter(struct i2c_adapter *adap);
432 :
433 :
434 : /* Return the functionality mask */
435 : static inline u32 i2c_get_functionality(struct i2c_adapter *adap)
436 : {
437 0 : return adap->algo->functionality(adap);
438 : }
439 :
440 : /* Return 1 if adapter supports everything we need, 0 if not. */
441 : static inline int i2c_check_functionality(struct i2c_adapter *adap, u32 func)
442 : {
443 0 : return (func & i2c_get_functionality(adap)) == func;
444 : }
445 :
446 : /* Return the adapter number for a specific adapter */
447 : static inline int i2c_adapter_id(struct i2c_adapter *adap)
448 : {
449 1 : return adap->nr;
450 : }
451 1 : #endif /* I2C */
452 : #endif /* __KERNEL__ */
453 :
454 : /**
455 : * struct i2c_msg - an I2C transaction segment beginning with START
456 : * @addr: Slave address, either seven or ten bits. When this is a ten
457 : * bit address, I2C_M_TEN must be set in @flags and the adapter
458 : * must support I2C_FUNC_10BIT_ADDR.
459 : * @flags: I2C_M_RD is handled by all adapters. No other flags may be
460 : * provided unless the adapter exported the relevant I2C_FUNC_*
461 : * flags through i2c_check_functionality().
462 : * @len: Number of data bytes in @buf being read from or written to the
463 : * I2C slave address. For read transactions where I2C_M_RECV_LEN
464 : * is set, the caller guarantees that this buffer can hold up to
465 : * 32 bytes in addition to the initial length byte sent by the
466 : * slave (plus, if used, the SMBus PEC); and this value will be
467 : * incremented by the number of block data bytes received.
468 : * @buf: The buffer into which data is read, or from which it's written.
469 : *
470 : * An i2c_msg is the low level representation of one segment of an I2C
471 : * transaction. It is visible to drivers in the @i2c_transfer() procedure,
472 : * to userspace from i2c-dev, and to I2C adapter drivers through the
473 : * @i2c_adapter.@master_xfer() method.
474 : *
475 : * Except when I2C "protocol mangling" is used, all I2C adapters implement
476 : * the standard rules for I2C transactions. Each transaction begins with a
477 : * START. That is followed by the slave address, and a bit encoding read
478 : * versus write. Then follow all the data bytes, possibly including a byte
479 : * with SMBus PEC. The transfer terminates with a NAK, or when all those
480 : * bytes have been transferred and ACKed. If this is the last message in a
481 : * group, it is followed by a STOP. Otherwise it is followed by the next
482 : * @i2c_msg transaction segment, beginning with a (repeated) START.
483 : *
484 : * Alternatively, when the adapter supports I2C_FUNC_PROTOCOL_MANGLING then
485 : * passing certain @flags may have changed those standard protocol behaviors.
486 : * Those flags are only for use with broken/nonconforming slaves, and with
487 : * adapters which are known to support the specific mangling options they
488 : * need (one or more of IGNORE_NAK, NO_RD_ACK, NOSTART, and REV_DIR_ADDR).
489 : */
490 : struct i2c_msg {
491 : __u16 addr; /* slave address */
492 : __u16 flags;
493 : #define I2C_M_TEN 0x0010 /* this is a ten bit chip address */
494 : #define I2C_M_RD 0x0001 /* read data, from slave to master */
495 : #define I2C_M_NOSTART 0x4000 /* if I2C_FUNC_PROTOCOL_MANGLING */
496 : #define I2C_M_REV_DIR_ADDR 0x2000 /* if I2C_FUNC_PROTOCOL_MANGLING */
497 : #define I2C_M_IGNORE_NAK 0x1000 /* if I2C_FUNC_PROTOCOL_MANGLING */
498 : #define I2C_M_NO_RD_ACK 0x0800 /* if I2C_FUNC_PROTOCOL_MANGLING */
499 : #define I2C_M_RECV_LEN 0x0400 /* length will be first received byte */
500 : __u16 len; /* msg length */
501 : __u8 *buf; /* pointer to msg data */
502 : };
503 1 :
504 : /* To determine what functionality is present */
505 :
506 : #define I2C_FUNC_I2C 0x00000001
507 : #define I2C_FUNC_10BIT_ADDR 0x00000002
508 : #define I2C_FUNC_PROTOCOL_MANGLING 0x00000004 /* I2C_M_NOSTART etc. */
509 : #define I2C_FUNC_SMBUS_PEC 0x00000008
510 : #define I2C_FUNC_SMBUS_BLOCK_PROC_CALL 0x00008000 /* SMBus 2.0 */
511 : #define I2C_FUNC_SMBUS_QUICK 0x00010000
512 : #define I2C_FUNC_SMBUS_READ_BYTE 0x00020000
513 : #define I2C_FUNC_SMBUS_WRITE_BYTE 0x00040000
514 : #define I2C_FUNC_SMBUS_READ_BYTE_DATA 0x00080000
515 : #define I2C_FUNC_SMBUS_WRITE_BYTE_DATA 0x00100000
516 : #define I2C_FUNC_SMBUS_READ_WORD_DATA 0x00200000
517 : #define I2C_FUNC_SMBUS_WRITE_WORD_DATA 0x00400000
518 : #define I2C_FUNC_SMBUS_PROC_CALL 0x00800000
519 : #define I2C_FUNC_SMBUS_READ_BLOCK_DATA 0x01000000
520 : #define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA 0x02000000
521 : #define I2C_FUNC_SMBUS_READ_I2C_BLOCK 0x04000000 /* I2C-like block xfer */
522 : #define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK 0x08000000 /* w/ 1-byte reg. addr. */
523 :
524 : #define I2C_FUNC_SMBUS_BYTE (I2C_FUNC_SMBUS_READ_BYTE | \
525 : I2C_FUNC_SMBUS_WRITE_BYTE)
526 : #define I2C_FUNC_SMBUS_BYTE_DATA (I2C_FUNC_SMBUS_READ_BYTE_DATA | \
527 : I2C_FUNC_SMBUS_WRITE_BYTE_DATA)
528 : #define I2C_FUNC_SMBUS_WORD_DATA (I2C_FUNC_SMBUS_READ_WORD_DATA | \
529 : I2C_FUNC_SMBUS_WRITE_WORD_DATA)
530 : #define I2C_FUNC_SMBUS_BLOCK_DATA (I2C_FUNC_SMBUS_READ_BLOCK_DATA | \
531 : I2C_FUNC_SMBUS_WRITE_BLOCK_DATA)
532 : #define I2C_FUNC_SMBUS_I2C_BLOCK (I2C_FUNC_SMBUS_READ_I2C_BLOCK | \
533 : I2C_FUNC_SMBUS_WRITE_I2C_BLOCK)
534 :
535 : #define I2C_FUNC_SMBUS_EMUL (I2C_FUNC_SMBUS_QUICK | \
536 : I2C_FUNC_SMBUS_BYTE | \
537 : I2C_FUNC_SMBUS_BYTE_DATA | \
538 : I2C_FUNC_SMBUS_WORD_DATA | \
539 : I2C_FUNC_SMBUS_PROC_CALL | \
540 : I2C_FUNC_SMBUS_WRITE_BLOCK_DATA | \
541 : I2C_FUNC_SMBUS_I2C_BLOCK | \
542 : I2C_FUNC_SMBUS_PEC)
543 :
544 : /*
545 : * Data for SMBus Messages
546 : */
547 : #define I2C_SMBUS_BLOCK_MAX 32 /* As specified in SMBus standard */
548 : union i2c_smbus_data {
549 : __u8 byte;
550 : __u16 word;
551 : __u8 block[I2C_SMBUS_BLOCK_MAX + 2]; /* block[0] is used for length */
552 : /* and one more for user-space compatibility */
553 1 : };
554 :
555 : /* i2c_smbus_xfer read or write markers */
556 : #define I2C_SMBUS_READ 1
557 : #define I2C_SMBUS_WRITE 0
558 :
559 : /* SMBus transaction types (size parameter in the above functions)
560 : Note: these no longer correspond to the (arbitrary) PIIX4 internal codes! */
561 : #define I2C_SMBUS_QUICK 0
562 : #define I2C_SMBUS_BYTE 1
563 : #define I2C_SMBUS_BYTE_DATA 2
564 : #define I2C_SMBUS_WORD_DATA 3
565 : #define I2C_SMBUS_PROC_CALL 4
566 : #define I2C_SMBUS_BLOCK_DATA 5
567 : #define I2C_SMBUS_I2C_BLOCK_BROKEN 6
568 : #define I2C_SMBUS_BLOCK_PROC_CALL 7 /* SMBus 2.0 */
569 : #define I2C_SMBUS_I2C_BLOCK_DATA 8
570 :
571 : #endif /* _LINUX_I2C_H */
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