block, cfq: move ioc ioprio/cgroup changed handling to cic
[linux-2.6.git] / include / linux / i2c.h
blob07d103a06d64a04e17e06a2b9011f773ef60d8f1
1 /* ------------------------------------------------------------------------- */
2 /* */
3 /* i2c.h - definitions for the i2c-bus interface */
4 /* */
5 /* ------------------------------------------------------------------------- */
6 /* Copyright (C) 1995-2000 Simon G. Vogl
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.
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.
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 /* ------------------------------------------------------------------------- */
23 /* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and
24 Frodo Looijaard <frodol@dds.nl> */
26 #ifndef _LINUX_I2C_H
27 #define _LINUX_I2C_H
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 */
38 extern struct bus_type i2c_bus_type;
39 extern struct device_type i2c_adapter_type;
41 /* --- General options ------------------------------------------------ */
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;
51 struct module;
53 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
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.
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);
66 /* Transfer num messages.
68 extern int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
69 int num);
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);
80 /* Now follow the 'nice' access routines. These also document the calling
81 conventions of i2c_smbus_xfer. */
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);
94 static inline s32
95 i2c_smbus_read_word_swapped(const struct i2c_client *client, u8 command)
97 s32 value = i2c_smbus_read_word_data(client, command);
99 return (value < 0) ? value : swab16(value);
102 static inline s32
103 i2c_smbus_write_word_swapped(const struct i2c_client *client,
104 u8 command, u16 value)
106 return i2c_smbus_write_word_data(client, command, swab16(value));
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 */
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)
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.
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.
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.
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.
160 struct i2c_driver {
161 unsigned int class;
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.
167 int (*attach_adapter)(struct i2c_adapter *) __deprecated;
168 int (*detach_adapter)(struct i2c_adapter *) __deprecated;
170 /* Standard driver model interfaces */
171 int (*probe)(struct i2c_client *, const struct i2c_device_id *);
172 int (*remove)(struct i2c_client *);
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 *);
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").
184 void (*alert)(struct i2c_client *, unsigned int data);
186 /* a ioctl like command that can be used to perform specific functions
187 * with the device.
189 int (*command)(struct i2c_client *client, unsigned int cmd, void *arg);
191 struct device_driver driver;
192 const struct i2c_device_id *id_table;
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;
199 #define to_i2c_driver(d) container_of(d, struct i2c_driver, driver)
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
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.
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;
231 #define to_i2c_client(d) container_of(d, struct i2c_client, dev)
233 extern struct i2c_client *i2c_verify_client(struct device *dev);
235 static inline struct i2c_client *kobj_to_i2c_client(struct kobject *kobj)
237 struct device * const dev = container_of(kobj, struct device, kobj);
238 return to_i2c_client(dev);
241 static inline void *i2c_get_clientdata(const struct i2c_client *dev)
243 return dev_get_drvdata(&dev->dev);
246 static inline void i2c_set_clientdata(struct i2c_client *dev, void *data)
248 dev_set_drvdata(&dev->dev, data);
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
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.
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.
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;
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.
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.
292 #define I2C_BOARD_INFO(dev_type, dev_addr) \
293 .type = dev_type, .addr = (dev_addr)
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.
301 extern struct i2c_client *
302 i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info);
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.
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));
316 /* Common custom probe functions */
317 extern int i2c_probe_func_quick_read(struct i2c_adapter *, unsigned short addr);
319 /* For devices that use several addresses, use i2c_new_dummy() to make
320 * client handles for the extra addresses.
322 extern struct i2c_client *
323 i2c_new_dummy(struct i2c_adapter *adap, u16 address);
325 extern void i2c_unregister_device(struct i2c_client *);
326 #endif /* I2C */
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.
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
338 i2c_register_board_info(int busnum, struct i2c_board_info const *info,
339 unsigned n)
341 return 0;
343 #endif /* I2C_BOARDINFO */
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.
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);
364 /* To determine what the adapter supports */
365 u32 (*functionality) (struct i2c_adapter *);
369 * i2c_adapter is the structure used to identify a physical i2c bus along
370 * with the access algorithms necessary to access it.
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;
378 /* data fields that are valid for all devices */
379 struct rt_mutex bus_lock;
381 int timeout; /* in jiffies */
382 int retries;
383 struct device dev; /* the adapter device */
385 int nr;
386 char name[48];
387 struct completion dev_released;
389 struct mutex userspace_clients_lock;
390 struct list_head userspace_clients;
392 #define to_i2c_adapter(d) container_of(d, struct i2c_adapter, dev)
394 static inline void *i2c_get_adapdata(const struct i2c_adapter *dev)
396 return dev_get_drvdata(&dev->dev);
399 static inline void i2c_set_adapdata(struct i2c_adapter *dev, void *data)
401 dev_set_drvdata(&dev->dev, data);
404 static inline struct i2c_adapter *
405 i2c_parent_is_i2c_adapter(const struct i2c_adapter *adapter)
407 struct device *parent = adapter->dev.parent;
409 if (parent != NULL && parent->type == &i2c_adapter_type)
410 return to_i2c_adapter(parent);
411 else
412 return NULL;
415 int i2c_for_each_dev(void *data, int (*fn)(struct device *, void *));
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 *);
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 */
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 */
432 /* Internal numbers to terminate lists */
433 #define I2C_CLIENT_END 0xfffeU
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 })
440 /* ----- functions exported by i2c.o */
442 /* administration...
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 *);
449 extern int i2c_register_driver(struct module *, struct i2c_driver *);
450 extern void i2c_del_driver(struct i2c_driver *);
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)
456 extern struct i2c_client *i2c_use_client(struct i2c_client *client);
457 extern void i2c_release_client(struct i2c_client *client);
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);
464 extern struct i2c_adapter *i2c_get_adapter(int nr);
465 extern void i2c_put_adapter(struct i2c_adapter *adap);
468 /* Return the functionality mask */
469 static inline u32 i2c_get_functionality(struct i2c_adapter *adap)
471 return adap->algo->functionality(adap);
474 /* Return 1 if adapter supports everything we need, 0 if not. */
475 static inline int i2c_check_functionality(struct i2c_adapter *adap, u32 func)
477 return (func & i2c_get_functionality(adap)) == func;
480 /* Return the adapter number for a specific adapter */
481 static inline int i2c_adapter_id(struct i2c_adapter *adap)
483 return adap->nr;
485 #endif /* I2C */
486 #endif /* __KERNEL__ */
489 * struct i2c_msg - an I2C transaction segment beginning with START
490 * @addr: Slave address, either seven or ten bits. When this is a ten
491 * bit address, I2C_M_TEN must be set in @flags and the adapter
492 * must support I2C_FUNC_10BIT_ADDR.
493 * @flags: I2C_M_RD is handled by all adapters. No other flags may be
494 * provided unless the adapter exported the relevant I2C_FUNC_*
495 * flags through i2c_check_functionality().
496 * @len: Number of data bytes in @buf being read from or written to the
497 * I2C slave address. For read transactions where I2C_M_RECV_LEN
498 * is set, the caller guarantees that this buffer can hold up to
499 * 32 bytes in addition to the initial length byte sent by the
500 * slave (plus, if used, the SMBus PEC); and this value will be
501 * incremented by the number of block data bytes received.
502 * @buf: The buffer into which data is read, or from which it's written.
504 * An i2c_msg is the low level representation of one segment of an I2C
505 * transaction. It is visible to drivers in the @i2c_transfer() procedure,
506 * to userspace from i2c-dev, and to I2C adapter drivers through the
507 * @i2c_adapter.@master_xfer() method.
509 * Except when I2C "protocol mangling" is used, all I2C adapters implement
510 * the standard rules for I2C transactions. Each transaction begins with a
511 * START. That is followed by the slave address, and a bit encoding read
512 * versus write. Then follow all the data bytes, possibly including a byte
513 * with SMBus PEC. The transfer terminates with a NAK, or when all those
514 * bytes have been transferred and ACKed. If this is the last message in a
515 * group, it is followed by a STOP. Otherwise it is followed by the next
516 * @i2c_msg transaction segment, beginning with a (repeated) START.
518 * Alternatively, when the adapter supports I2C_FUNC_PROTOCOL_MANGLING then
519 * passing certain @flags may have changed those standard protocol behaviors.
520 * Those flags are only for use with broken/nonconforming slaves, and with
521 * adapters which are known to support the specific mangling options they
522 * need (one or more of IGNORE_NAK, NO_RD_ACK, NOSTART, and REV_DIR_ADDR).
524 struct i2c_msg {
525 __u16 addr; /* slave address */
526 __u16 flags;
527 #define I2C_M_TEN 0x0010 /* this is a ten bit chip address */
528 #define I2C_M_RD 0x0001 /* read data, from slave to master */
529 #define I2C_M_NOSTART 0x4000 /* if I2C_FUNC_PROTOCOL_MANGLING */
530 #define I2C_M_REV_DIR_ADDR 0x2000 /* if I2C_FUNC_PROTOCOL_MANGLING */
531 #define I2C_M_IGNORE_NAK 0x1000 /* if I2C_FUNC_PROTOCOL_MANGLING */
532 #define I2C_M_NO_RD_ACK 0x0800 /* if I2C_FUNC_PROTOCOL_MANGLING */
533 #define I2C_M_RECV_LEN 0x0400 /* length will be first received byte */
534 __u16 len; /* msg length */
535 __u8 *buf; /* pointer to msg data */
538 /* To determine what functionality is present */
540 #define I2C_FUNC_I2C 0x00000001
541 #define I2C_FUNC_10BIT_ADDR 0x00000002
542 #define I2C_FUNC_PROTOCOL_MANGLING 0x00000004 /* I2C_M_NOSTART etc. */
543 #define I2C_FUNC_SMBUS_PEC 0x00000008
544 #define I2C_FUNC_SMBUS_BLOCK_PROC_CALL 0x00008000 /* SMBus 2.0 */
545 #define I2C_FUNC_SMBUS_QUICK 0x00010000
546 #define I2C_FUNC_SMBUS_READ_BYTE 0x00020000
547 #define I2C_FUNC_SMBUS_WRITE_BYTE 0x00040000
548 #define I2C_FUNC_SMBUS_READ_BYTE_DATA 0x00080000
549 #define I2C_FUNC_SMBUS_WRITE_BYTE_DATA 0x00100000
550 #define I2C_FUNC_SMBUS_READ_WORD_DATA 0x00200000
551 #define I2C_FUNC_SMBUS_WRITE_WORD_DATA 0x00400000
552 #define I2C_FUNC_SMBUS_PROC_CALL 0x00800000
553 #define I2C_FUNC_SMBUS_READ_BLOCK_DATA 0x01000000
554 #define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA 0x02000000
555 #define I2C_FUNC_SMBUS_READ_I2C_BLOCK 0x04000000 /* I2C-like block xfer */
556 #define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK 0x08000000 /* w/ 1-byte reg. addr. */
558 #define I2C_FUNC_SMBUS_BYTE (I2C_FUNC_SMBUS_READ_BYTE | \
559 I2C_FUNC_SMBUS_WRITE_BYTE)
560 #define I2C_FUNC_SMBUS_BYTE_DATA (I2C_FUNC_SMBUS_READ_BYTE_DATA | \
561 I2C_FUNC_SMBUS_WRITE_BYTE_DATA)
562 #define I2C_FUNC_SMBUS_WORD_DATA (I2C_FUNC_SMBUS_READ_WORD_DATA | \
563 I2C_FUNC_SMBUS_WRITE_WORD_DATA)
564 #define I2C_FUNC_SMBUS_BLOCK_DATA (I2C_FUNC_SMBUS_READ_BLOCK_DATA | \
565 I2C_FUNC_SMBUS_WRITE_BLOCK_DATA)
566 #define I2C_FUNC_SMBUS_I2C_BLOCK (I2C_FUNC_SMBUS_READ_I2C_BLOCK | \
567 I2C_FUNC_SMBUS_WRITE_I2C_BLOCK)
569 #define I2C_FUNC_SMBUS_EMUL (I2C_FUNC_SMBUS_QUICK | \
570 I2C_FUNC_SMBUS_BYTE | \
571 I2C_FUNC_SMBUS_BYTE_DATA | \
572 I2C_FUNC_SMBUS_WORD_DATA | \
573 I2C_FUNC_SMBUS_PROC_CALL | \
574 I2C_FUNC_SMBUS_WRITE_BLOCK_DATA | \
575 I2C_FUNC_SMBUS_I2C_BLOCK | \
576 I2C_FUNC_SMBUS_PEC)
579 * Data for SMBus Messages
581 #define I2C_SMBUS_BLOCK_MAX 32 /* As specified in SMBus standard */
582 union i2c_smbus_data {
583 __u8 byte;
584 __u16 word;
585 __u8 block[I2C_SMBUS_BLOCK_MAX + 2]; /* block[0] is used for length */
586 /* and one more for user-space compatibility */
589 /* i2c_smbus_xfer read or write markers */
590 #define I2C_SMBUS_READ 1
591 #define I2C_SMBUS_WRITE 0
593 /* SMBus transaction types (size parameter in the above functions)
594 Note: these no longer correspond to the (arbitrary) PIIX4 internal codes! */
595 #define I2C_SMBUS_QUICK 0
596 #define I2C_SMBUS_BYTE 1
597 #define I2C_SMBUS_BYTE_DATA 2
598 #define I2C_SMBUS_WORD_DATA 3
599 #define I2C_SMBUS_PROC_CALL 4
600 #define I2C_SMBUS_BLOCK_DATA 5
601 #define I2C_SMBUS_I2C_BLOCK_BROKEN 6
602 #define I2C_SMBUS_BLOCK_PROC_CALL 7 /* SMBus 2.0 */
603 #define I2C_SMBUS_I2C_BLOCK_DATA 8
605 #endif /* _LINUX_I2C_H */