1 /* ------------------------------------------------------------------------- */
3 /* i2c.h - definitions for the i2c-bus interface */
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., 51 Franklin Street, Fifth Floor, Boston,
22 /* ------------------------------------------------------------------------- */
24 /* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and
25 Frodo Looijaard <frodol@dds.nl> */
30 #include <linux/types.h>
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 */
39 extern struct bus_type i2c_bus_type;
40 extern struct device_type i2c_adapter_type;
42 /* --- General options ------------------------------------------------ */
50 struct i2c_board_info;
54 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
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.
62 extern int i2c_master_send(const struct i2c_client *client, const char *buf,
64 extern int i2c_master_recv(const struct i2c_client *client, char *buf,
67 /* Transfer num messages.
69 extern int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
72 extern int __i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
75 /* This is the very generalized SMBus access routine. You probably do not
76 want to use this, though; one of the functions below may be much easier,
77 and probably just as fast.
78 Note that we use i2c_adapter here, because you do not need a specific
79 smbus adapter to call this function. */
80 extern s32 i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr,
81 unsigned short flags, char read_write, u8 command,
82 int size, union i2c_smbus_data *data);
84 /* Now follow the 'nice' access routines. These also document the calling
85 conventions of i2c_smbus_xfer. */
87 extern s32 i2c_smbus_read_byte(const struct i2c_client *client);
88 extern s32 i2c_smbus_write_byte(const struct i2c_client *client, u8 value);
89 extern s32 i2c_smbus_read_byte_data(const struct i2c_client *client,
91 extern s32 i2c_smbus_write_byte_data(const struct i2c_client *client,
92 u8 command, u8 value);
93 extern s32 i2c_smbus_read_word_data(const struct i2c_client *client,
95 extern s32 i2c_smbus_write_word_data(const struct i2c_client *client,
96 u8 command, u16 value);
99 i2c_smbus_read_word_swapped(const struct i2c_client *client, u8 command)
101 s32 value = i2c_smbus_read_word_data(client, command);
103 return (value < 0) ? value : swab16(value);
107 i2c_smbus_write_word_swapped(const struct i2c_client *client,
108 u8 command, u16 value)
110 return i2c_smbus_write_word_data(client, command, swab16(value));
113 /* Returns the number of read bytes */
114 extern s32 i2c_smbus_read_block_data(const struct i2c_client *client,
115 u8 command, u8 *values);
116 extern s32 i2c_smbus_write_block_data(const struct i2c_client *client,
117 u8 command, u8 length, const u8 *values);
118 /* Returns the number of read bytes */
119 extern s32 i2c_smbus_read_i2c_block_data(const struct i2c_client *client,
120 u8 command, u8 length, u8 *values);
121 extern s32 i2c_smbus_write_i2c_block_data(const struct i2c_client *client,
122 u8 command, u8 length,
127 * struct i2c_driver - represent an I2C device driver
128 * @class: What kind of i2c device we instantiate (for detect)
129 * @attach_adapter: Callback for bus addition (deprecated)
130 * @detach_adapter: Callback for bus removal (deprecated)
131 * @probe: Callback for device binding
132 * @remove: Callback for device unbinding
133 * @shutdown: Callback for device shutdown
134 * @suspend: Callback for device suspend
135 * @resume: Callback for device resume
136 * @alert: Alert callback, for example for the SMBus alert protocol
137 * @command: Callback for bus-wide signaling (optional)
138 * @driver: Device driver model driver
139 * @id_table: List of I2C devices supported by this driver
140 * @detect: Callback for device detection
141 * @address_list: The I2C addresses to probe (for detect)
142 * @clients: List of detected clients we created (for i2c-core use only)
144 * The driver.owner field should be set to the module owner of this driver.
145 * The driver.name field should be set to the name of this driver.
147 * For automatic device detection, both @detect and @address_data must
148 * be defined. @class should also be set, otherwise only devices forced
149 * with module parameters will be created. The detect function must
150 * fill at least the name field of the i2c_board_info structure it is
151 * handed upon successful detection, and possibly also the flags field.
153 * If @detect is missing, the driver will still work fine for enumerated
154 * devices. Detected devices simply won't be supported. This is expected
155 * for the many I2C/SMBus devices which can't be detected reliably, and
156 * the ones which can always be enumerated in practice.
158 * The i2c_client structure which is handed to the @detect callback is
159 * not a real i2c_client. It is initialized just enough so that you can
160 * call i2c_smbus_read_byte_data and friends on it. Don't do anything
161 * else with it. In particular, calling dev_dbg and friends on it is
167 /* Notifies the driver that a new bus has appeared or is about to be
168 * removed. You should avoid using this, it will be removed in a
171 int (*attach_adapter)(struct i2c_adapter *) __deprecated;
172 int (*detach_adapter)(struct i2c_adapter *) __deprecated;
174 /* Standard driver model interfaces */
175 int (*probe)(struct i2c_client *, const struct i2c_device_id *);
176 int (*remove)(struct i2c_client *);
178 /* driver model interfaces that don't relate to enumeration */
179 void (*shutdown)(struct i2c_client *);
180 int (*suspend)(struct i2c_client *, pm_message_t mesg);
181 int (*resume)(struct i2c_client *);
183 /* Alert callback, for example for the SMBus alert protocol.
184 * The format and meaning of the data value depends on the protocol.
185 * For the SMBus alert protocol, there is a single bit of data passed
186 * as the alert response's low bit ("event flag").
188 void (*alert)(struct i2c_client *, unsigned int data);
190 /* a ioctl like command that can be used to perform specific functions
193 int (*command)(struct i2c_client *client, unsigned int cmd, void *arg);
195 struct device_driver driver;
196 const struct i2c_device_id *id_table;
198 /* Device detection callback for automatic device creation */
199 int (*detect)(struct i2c_client *, struct i2c_board_info *);
200 const unsigned short *address_list;
201 struct list_head clients;
203 #define to_i2c_driver(d) container_of(d, struct i2c_driver, driver)
206 * struct i2c_client - represent an I2C slave device
207 * @flags: I2C_CLIENT_TEN indicates the device uses a ten bit chip address;
208 * I2C_CLIENT_PEC indicates it uses SMBus Packet Error Checking
209 * @addr: Address used on the I2C bus connected to the parent adapter.
210 * @name: Indicates the type of the device, usually a chip name that's
211 * generic enough to hide second-sourcing and compatible revisions.
212 * @adapter: manages the bus segment hosting this I2C device
213 * @driver: device's driver, hence pointer to access routines
214 * @dev: Driver model device node for the slave.
215 * @irq: indicates the IRQ generated by this device (if any)
216 * @detected: member of an i2c_driver.clients list or i2c-core's
217 * userspace_devices list
219 * An i2c_client identifies a single device (i.e. chip) connected to an
220 * i2c bus. The behaviour exposed to Linux is defined by the driver
221 * managing the device.
224 unsigned short flags; /* div., see below */
225 unsigned short addr; /* chip address - NOTE: 7bit */
226 /* addresses are stored in the */
228 char name[I2C_NAME_SIZE];
229 struct i2c_adapter *adapter; /* the adapter we sit on */
230 struct i2c_driver *driver; /* and our access routines */
231 struct device dev; /* the device structure */
232 int irq; /* irq issued by device */
233 struct list_head detected;
235 #define to_i2c_client(d) container_of(d, struct i2c_client, dev)
237 extern struct i2c_client *i2c_verify_client(struct device *dev);
239 static inline struct i2c_client *kobj_to_i2c_client(struct kobject *kobj)
241 struct device * const dev = container_of(kobj, struct device, kobj);
242 return to_i2c_client(dev);
245 static inline void *i2c_get_clientdata(const struct i2c_client *dev)
247 return dev_get_drvdata(&dev->dev);
250 static inline void i2c_set_clientdata(struct i2c_client *dev, void *data)
252 dev_set_drvdata(&dev->dev, data);
256 * struct i2c_board_info - template for device creation
257 * @type: chip type, to initialize i2c_client.name
258 * @flags: to initialize i2c_client.flags
259 * @addr: stored in i2c_client.addr
260 * @platform_data: stored in i2c_client.dev.platform_data
261 * @archdata: copied into i2c_client.dev.archdata
262 * @of_node: pointer to OpenFirmware device node
263 * @irq: stored in i2c_client.irq
265 * I2C doesn't actually support hardware probing, although controllers and
266 * devices may be able to use I2C_SMBUS_QUICK to tell whether or not there's
267 * a device at a given address. Drivers commonly need more information than
268 * that, such as chip type, configuration, associated IRQ, and so on.
270 * i2c_board_info is used to build tables of information listing I2C devices
271 * that are present. This information is used to grow the driver model tree.
272 * For mainboards this is done statically using i2c_register_board_info();
273 * bus numbers identify adapters that aren't yet available. For add-on boards,
274 * i2c_new_device() does this dynamically with the adapter already known.
276 struct i2c_board_info {
277 char type[I2C_NAME_SIZE];
278 unsigned short flags;
281 struct dev_archdata *archdata;
282 struct device_node *of_node;
287 * I2C_BOARD_INFO - macro used to list an i2c device and its address
288 * @dev_type: identifies the device type
289 * @dev_addr: the device's address on the bus.
291 * This macro initializes essential fields of a struct i2c_board_info,
292 * declaring what has been provided on a particular board. Optional
293 * fields (such as associated irq, or device-specific platform_data)
294 * are provided using conventional syntax.
296 #define I2C_BOARD_INFO(dev_type, dev_addr) \
297 .type = dev_type, .addr = (dev_addr)
300 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
301 /* Add-on boards should register/unregister their devices; e.g. a board
302 * with integrated I2C, a config eeprom, sensors, and a codec that's
303 * used in conjunction with the primary hardware.
305 extern struct i2c_client *
306 i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info);
308 /* If you don't know the exact address of an I2C device, use this variant
309 * instead, which can probe for device presence in a list of possible
310 * addresses. The "probe" callback function is optional. If it is provided,
311 * it must return 1 on successful probe, 0 otherwise. If it is not provided,
312 * a default probing method is used.
314 extern struct i2c_client *
315 i2c_new_probed_device(struct i2c_adapter *adap,
316 struct i2c_board_info *info,
317 unsigned short const *addr_list,
318 int (*probe)(struct i2c_adapter *, unsigned short addr));
320 /* Common custom probe functions */
321 extern int i2c_probe_func_quick_read(struct i2c_adapter *, unsigned short addr);
323 /* For devices that use several addresses, use i2c_new_dummy() to make
324 * client handles for the extra addresses.
326 extern struct i2c_client *
327 i2c_new_dummy(struct i2c_adapter *adap, u16 address);
329 extern void i2c_unregister_device(struct i2c_client *);
332 /* Mainboard arch_initcall() code should register all its I2C devices.
333 * This is done at arch_initcall time, before declaring any i2c adapters.
334 * Modules for add-on boards must use other calls.
336 #ifdef CONFIG_I2C_BOARDINFO
338 i2c_register_board_info(int busnum, struct i2c_board_info const *info,
342 i2c_register_board_info(int busnum, struct i2c_board_info const *info,
347 #endif /* I2C_BOARDINFO */
350 * The following structs are for those who like to implement new bus drivers:
351 * i2c_algorithm is the interface to a class of hardware solutions which can
352 * be addressed using the same bus algorithms - i.e. bit-banging or the PCF8584
353 * to name two of the most common.
355 struct i2c_algorithm {
356 /* If an adapter algorithm can't do I2C-level access, set master_xfer
357 to NULL. If an adapter algorithm can do SMBus access, set
358 smbus_xfer. If set to NULL, the SMBus protocol is simulated
359 using common I2C messages */
360 /* master_xfer should return the number of messages successfully
361 processed, or a negative value on error */
362 int (*master_xfer)(struct i2c_adapter *adap, struct i2c_msg *msgs,
364 int (*smbus_xfer) (struct i2c_adapter *adap, u16 addr,
365 unsigned short flags, char read_write,
366 u8 command, int size, union i2c_smbus_data *data);
368 /* To determine what the adapter supports */
369 u32 (*functionality) (struct i2c_adapter *);
373 * i2c_adapter is the structure used to identify a physical i2c bus along
374 * with the access algorithms necessary to access it.
377 struct module *owner;
378 unsigned int class; /* classes to allow probing for */
379 const struct i2c_algorithm *algo; /* the algorithm to access the bus */
382 /* data fields that are valid for all devices */
383 struct rt_mutex bus_lock;
385 int timeout; /* in jiffies */
387 struct device dev; /* the adapter device */
391 struct completion dev_released;
393 struct mutex userspace_clients_lock;
394 struct list_head userspace_clients;
396 #define to_i2c_adapter(d) container_of(d, struct i2c_adapter, dev)
398 static inline void *i2c_get_adapdata(const struct i2c_adapter *dev)
400 return dev_get_drvdata(&dev->dev);
403 static inline void i2c_set_adapdata(struct i2c_adapter *dev, void *data)
405 dev_set_drvdata(&dev->dev, data);
408 static inline struct i2c_adapter *
409 i2c_parent_is_i2c_adapter(const struct i2c_adapter *adapter)
411 struct device *parent = adapter->dev.parent;
413 if (parent != NULL && parent->type == &i2c_adapter_type)
414 return to_i2c_adapter(parent);
419 int i2c_for_each_dev(void *data, int (*fn)(struct device *, void *));
421 /* Adapter locking functions, exported for shared pin cases */
422 void i2c_lock_adapter(struct i2c_adapter *);
423 void i2c_unlock_adapter(struct i2c_adapter *);
425 /*flags for the client struct: */
426 #define I2C_CLIENT_PEC 0x04 /* Use Packet Error Checking */
427 #define I2C_CLIENT_TEN 0x10 /* we have a ten bit chip address */
428 /* Must equal I2C_M_TEN below */
429 #define I2C_CLIENT_WAKE 0x80 /* for board_info; true iff can wake */
431 /* i2c adapter classes (bitmask) */
432 #define I2C_CLASS_HWMON (1<<0) /* lm_sensors, ... */
433 #define I2C_CLASS_DDC (1<<3) /* DDC bus on graphics adapters */
434 #define I2C_CLASS_SPD (1<<7) /* Memory modules */
436 /* Internal numbers to terminate lists */
437 #define I2C_CLIENT_END 0xfffeU
439 /* Construct an I2C_CLIENT_END-terminated array of i2c addresses */
440 #define I2C_ADDRS(addr, addrs...) \
441 ((const unsigned short []){ addr, ## addrs, I2C_CLIENT_END })
444 /* ----- functions exported by i2c.o */
448 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
449 extern int i2c_add_adapter(struct i2c_adapter *);
450 extern int i2c_del_adapter(struct i2c_adapter *);
451 extern int i2c_add_numbered_adapter(struct i2c_adapter *);
453 extern int i2c_register_driver(struct module *, struct i2c_driver *);
454 extern void i2c_del_driver(struct i2c_driver *);
456 /* use a define to avoid include chaining to get THIS_MODULE */
457 #define i2c_add_driver(driver) \
458 i2c_register_driver(THIS_MODULE, driver)
460 extern struct i2c_client *i2c_use_client(struct i2c_client *client);
461 extern void i2c_release_client(struct i2c_client *client);
463 /* call the i2c_client->command() of all attached clients with
464 * the given arguments */
465 extern void i2c_clients_command(struct i2c_adapter *adap,
466 unsigned int cmd, void *arg);
468 extern struct i2c_adapter *i2c_get_adapter(int nr);
469 extern void i2c_put_adapter(struct i2c_adapter *adap);
472 /* Return the functionality mask */
473 static inline u32 i2c_get_functionality(struct i2c_adapter *adap)
475 return adap->algo->functionality(adap);
478 /* Return 1 if adapter supports everything we need, 0 if not. */
479 static inline int i2c_check_functionality(struct i2c_adapter *adap, u32 func)
481 return (func & i2c_get_functionality(adap)) == func;
484 /* Return the adapter number for a specific adapter */
485 static inline int i2c_adapter_id(struct i2c_adapter *adap)
491 * module_i2c_driver() - Helper macro for registering a I2C driver
492 * @__i2c_driver: i2c_driver struct
494 * Helper macro for I2C drivers which do not do anything special in module
495 * init/exit. This eliminates a lot of boilerplate. Each module may only
496 * use this macro once, and calling it replaces module_init() and module_exit()
498 #define module_i2c_driver(__i2c_driver) \
499 module_driver(__i2c_driver, i2c_add_driver, \
503 #endif /* __KERNEL__ */
506 * struct i2c_msg - an I2C transaction segment beginning with START
507 * @addr: Slave address, either seven or ten bits. When this is a ten
508 * bit address, I2C_M_TEN must be set in @flags and the adapter
509 * must support I2C_FUNC_10BIT_ADDR.
510 * @flags: I2C_M_RD is handled by all adapters. No other flags may be
511 * provided unless the adapter exported the relevant I2C_FUNC_*
512 * flags through i2c_check_functionality().
513 * @len: Number of data bytes in @buf being read from or written to the
514 * I2C slave address. For read transactions where I2C_M_RECV_LEN
515 * is set, the caller guarantees that this buffer can hold up to
516 * 32 bytes in addition to the initial length byte sent by the
517 * slave (plus, if used, the SMBus PEC); and this value will be
518 * incremented by the number of block data bytes received.
519 * @buf: The buffer into which data is read, or from which it's written.
521 * An i2c_msg is the low level representation of one segment of an I2C
522 * transaction. It is visible to drivers in the @i2c_transfer() procedure,
523 * to userspace from i2c-dev, and to I2C adapter drivers through the
524 * @i2c_adapter.@master_xfer() method.
526 * Except when I2C "protocol mangling" is used, all I2C adapters implement
527 * the standard rules for I2C transactions. Each transaction begins with a
528 * START. That is followed by the slave address, and a bit encoding read
529 * versus write. Then follow all the data bytes, possibly including a byte
530 * with SMBus PEC. The transfer terminates with a NAK, or when all those
531 * bytes have been transferred and ACKed. If this is the last message in a
532 * group, it is followed by a STOP. Otherwise it is followed by the next
533 * @i2c_msg transaction segment, beginning with a (repeated) START.
535 * Alternatively, when the adapter supports I2C_FUNC_PROTOCOL_MANGLING then
536 * passing certain @flags may have changed those standard protocol behaviors.
537 * Those flags are only for use with broken/nonconforming slaves, and with
538 * adapters which are known to support the specific mangling options they
539 * need (one or more of IGNORE_NAK, NO_RD_ACK, NOSTART, and REV_DIR_ADDR).
542 __u16 addr; /* slave address */
544 #define I2C_M_TEN 0x0010 /* this is a ten bit chip address */
545 #define I2C_M_RD 0x0001 /* read data, from slave to master */
546 #define I2C_M_NOSTART 0x4000 /* if I2C_FUNC_PROTOCOL_MANGLING */
547 #define I2C_M_REV_DIR_ADDR 0x2000 /* if I2C_FUNC_PROTOCOL_MANGLING */
548 #define I2C_M_IGNORE_NAK 0x1000 /* if I2C_FUNC_PROTOCOL_MANGLING */
549 #define I2C_M_NO_RD_ACK 0x0800 /* if I2C_FUNC_PROTOCOL_MANGLING */
550 #define I2C_M_RECV_LEN 0x0400 /* length will be first received byte */
551 __u16 len; /* msg length */
552 __u8 *buf; /* pointer to msg data */
555 /* To determine what functionality is present */
557 #define I2C_FUNC_I2C 0x00000001
558 #define I2C_FUNC_10BIT_ADDR 0x00000002
559 #define I2C_FUNC_PROTOCOL_MANGLING 0x00000004 /* I2C_M_NOSTART etc. */
560 #define I2C_FUNC_SMBUS_PEC 0x00000008
561 #define I2C_FUNC_SMBUS_BLOCK_PROC_CALL 0x00008000 /* SMBus 2.0 */
562 #define I2C_FUNC_SMBUS_QUICK 0x00010000
563 #define I2C_FUNC_SMBUS_READ_BYTE 0x00020000
564 #define I2C_FUNC_SMBUS_WRITE_BYTE 0x00040000
565 #define I2C_FUNC_SMBUS_READ_BYTE_DATA 0x00080000
566 #define I2C_FUNC_SMBUS_WRITE_BYTE_DATA 0x00100000
567 #define I2C_FUNC_SMBUS_READ_WORD_DATA 0x00200000
568 #define I2C_FUNC_SMBUS_WRITE_WORD_DATA 0x00400000
569 #define I2C_FUNC_SMBUS_PROC_CALL 0x00800000
570 #define I2C_FUNC_SMBUS_READ_BLOCK_DATA 0x01000000
571 #define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA 0x02000000
572 #define I2C_FUNC_SMBUS_READ_I2C_BLOCK 0x04000000 /* I2C-like block xfer */
573 #define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK 0x08000000 /* w/ 1-byte reg. addr. */
575 #define I2C_FUNC_SMBUS_BYTE (I2C_FUNC_SMBUS_READ_BYTE | \
576 I2C_FUNC_SMBUS_WRITE_BYTE)
577 #define I2C_FUNC_SMBUS_BYTE_DATA (I2C_FUNC_SMBUS_READ_BYTE_DATA | \
578 I2C_FUNC_SMBUS_WRITE_BYTE_DATA)
579 #define I2C_FUNC_SMBUS_WORD_DATA (I2C_FUNC_SMBUS_READ_WORD_DATA | \
580 I2C_FUNC_SMBUS_WRITE_WORD_DATA)
581 #define I2C_FUNC_SMBUS_BLOCK_DATA (I2C_FUNC_SMBUS_READ_BLOCK_DATA | \
582 I2C_FUNC_SMBUS_WRITE_BLOCK_DATA)
583 #define I2C_FUNC_SMBUS_I2C_BLOCK (I2C_FUNC_SMBUS_READ_I2C_BLOCK | \
584 I2C_FUNC_SMBUS_WRITE_I2C_BLOCK)
586 #define I2C_FUNC_SMBUS_EMUL (I2C_FUNC_SMBUS_QUICK | \
587 I2C_FUNC_SMBUS_BYTE | \
588 I2C_FUNC_SMBUS_BYTE_DATA | \
589 I2C_FUNC_SMBUS_WORD_DATA | \
590 I2C_FUNC_SMBUS_PROC_CALL | \
591 I2C_FUNC_SMBUS_WRITE_BLOCK_DATA | \
592 I2C_FUNC_SMBUS_I2C_BLOCK | \
596 * Data for SMBus Messages
598 #define I2C_SMBUS_BLOCK_MAX 32 /* As specified in SMBus standard */
599 union i2c_smbus_data {
602 __u8 block[I2C_SMBUS_BLOCK_MAX + 2]; /* block[0] is used for length */
603 /* and one more for user-space compatibility */
606 /* i2c_smbus_xfer read or write markers */
607 #define I2C_SMBUS_READ 1
608 #define I2C_SMBUS_WRITE 0
610 /* SMBus transaction types (size parameter in the above functions)
611 Note: these no longer correspond to the (arbitrary) PIIX4 internal codes! */
612 #define I2C_SMBUS_QUICK 0
613 #define I2C_SMBUS_BYTE 1
614 #define I2C_SMBUS_BYTE_DATA 2
615 #define I2C_SMBUS_WORD_DATA 3
616 #define I2C_SMBUS_PROC_CALL 4
617 #define I2C_SMBUS_BLOCK_DATA 5
618 #define I2C_SMBUS_I2C_BLOCK_BROKEN 6
619 #define I2C_SMBUS_BLOCK_PROC_CALL 7 /* SMBus 2.0 */
620 #define I2C_SMBUS_I2C_BLOCK_DATA 8
622 #endif /* _LINUX_I2C_H */