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i2c.h @ 3740

Revision 3740, 23.7 KB (checked in by phil, 10 years ago)
(Phil) Tag and release 2.7.0
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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	/* $Id$ */
27
28	#ifndef I2C_H
29	#define I2C_H
30
31	#define I2C_DATE "20021208"
32	#define I2C_VERSION "2.7.0"
33
34	#include "i2c-id.h" /* id values of adapters et. al. */
35	#include <linux/types.h>
36
37
38	struct i2c_msg;
39
40
41	#ifdef __KERNEL__
42
43	/* --- Includes and compatibility declarations ------------------------ */
44
45	#include <linux/version.h>
46	#ifndef KERNEL_VERSION
47	#define KERNEL_VERSION(a,b,c) (((a) << 16) \| ((b) << 8) \| (c))
48	#endif
49
50	#include <asm/page.h> /* for 2.2.xx */
51	#if LINUX_VERSION_CODE < KERNEL_VERSION(2,0,25)
52	#include <linux/sched.h>
53	#else
54	#include <asm/semaphore.h>
55	#endif
56	#include <linux/config.h>
57
58	/* --- General options ------------------------------------------------ */
59
60	#define I2C_ALGO_MAX 4 /* control memory consumption */
61	#define I2C_ADAP_MAX 16
62	#define I2C_DRIVER_MAX 16
63	#define I2C_CLIENT_MAX 32
64	#define I2C_DUMMY_MAX 4
65
66	struct i2c_algorithm;
67	struct i2c_adapter;
68	struct i2c_client;
69	struct i2c_driver;
70	struct i2c_client_address_data;
71	union i2c_smbus_data;
72
73	#if LINUX_VERSION_CODE < KERNEL_VERSION(2,4,1)
74	#ifndef __exit
75	#define __exit
76	#endif
77	#endif
78
79	/*
80	* The master routines are the ones normally used to transmit data to devices
81	* on a bus (or read from them). Apart from two basic transfer functions to
82	* transmit one message at a time, a more complex version can be used to
83	* transmit an arbitrary number of messages without interruption.
84	*/
85	extern int i2c_master_send(struct i2c_client ,const char ,int);
86	extern int i2c_master_recv(struct i2c_client ,char ,int);
87
88	/* Transfer num messages.
89	*/
90	extern int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg msg[],int num);
91
92	/*
93	* Some adapter types (i.e. PCF 8584 based ones) may support slave behaviuor.
94	* This is not tested/implemented yet and will change in the future.
95	*/
96	extern int i2c_slave_send(struct i2c_client ,char,int);
97	extern int i2c_slave_recv(struct i2c_client ,char,int);
98
99
100
101	/* This is the very generalized SMBus access routine. You probably do not
102	want to use this, though; one of the functions below may be much easier,
103	and probably just as fast.
104	Note that we use i2c_adapter here, because you do not need a specific
105	smbus adapter to call this function. */
106	extern s32 i2c_smbus_xfer (struct i2c_adapter * adapter, u16 addr,
107	unsigned short flags,
108	char read_write, u8 command, int size,
109	union i2c_smbus_data * data);
110
111	/* Now follow the 'nice' access routines. These also document the calling
112	conventions of smbus_access. */
113
114	extern s32 i2c_smbus_write_quick(struct i2c_client * client, u8 value);
115	extern s32 i2c_smbus_read_byte(struct i2c_client * client);
116	extern s32 i2c_smbus_write_byte(struct i2c_client * client, u8 value);
117	extern s32 i2c_smbus_read_byte_data(struct i2c_client * client, u8 command);
118	extern s32 i2c_smbus_write_byte_data(struct i2c_client * client,
119	u8 command, u8 value);
120	extern s32 i2c_smbus_read_word_data(struct i2c_client * client, u8 command);
121	extern s32 i2c_smbus_write_word_data(struct i2c_client * client,
122	u8 command, u16 value);
123	extern s32 i2c_smbus_process_call(struct i2c_client * client,
124	u8 command, u16 value);
125	/* Returns the number of read bytes */
126	extern s32 i2c_smbus_read_block_data(struct i2c_client * client,
127	u8 command, u8 *values);
128	extern s32 i2c_smbus_write_block_data(struct i2c_client * client,
129	u8 command, u8 length,
130	u8 *values);
131	extern s32 i2c_smbus_read_i2c_block_data(struct i2c_client * client,
132	u8 command, u8 *values);
133	extern s32 i2c_smbus_write_i2c_block_data(struct i2c_client * client,
134	u8 command, u8 length,
135	u8 *values);
136
137
138	/*
139	* A driver is capable of handling one or more physical devices present on
140	* I2C adapters. This information is used to inform the driver of adapter
141	* events.
142	*/
143
144	struct i2c_driver {
145	char name[32];
146	int id;
147	unsigned int flags; /* div., see below */
148
149	/* Notifies the driver that a new bus has appeared. This routine
150	* can be used by the driver to test if the bus meets its conditions
151	* & seek for the presence of the chip(s) it supports. If found, it
152	* registers the client(s) that are on the bus to the i2c admin. via
153	* i2c_attach_client.
154	*/
155	int (attach_adapter)(struct i2c_adapter );
156
157	/* tells the driver that a client is about to be deleted & gives it
158	* the chance to remove its private data. Also, if the client struct
159	* has been dynamically allocated by the driver in the function above,
160	* it must be freed here.
161	*/
162	int (detach_client)(struct i2c_client );
163
164	/* a ioctl like command that can be used to perform specific functions
165	* with the device.
166	*/
167	int (command)(struct i2c_client client,unsigned int cmd, void *arg);
168
169	/* These two are mainly used for bookkeeping & dynamic unloading of
170	* kernel modules. inc_use tells the driver that a client is being
171	* used by another module & that it should increase its ref. counter.
172	* dec_use is the inverse operation.
173	* NB: Make sure you have no circular dependencies, or else you get a
174	* deadlock when trying to unload the modules.
175	* You should use the i2c_{inc,dec}_use_client functions instead of
176	* calling this function directly.
177	*/
178	void (inc_use)(struct i2c_client client);
179	void (dec_use)(struct i2c_client client);
180	};
181
182	/*
183	* i2c_client identifies a single device (i.e. chip) that is connected to an
184	* i2c bus. The behaviour is defined by the routines of the driver. This
185	* function is mainly used for lookup & other admin. functions.
186	*/
187	struct i2c_client {
188	char name[32];
189	int id;
190	unsigned int flags; /* div., see below */
191	unsigned int addr; /* chip address - NOTE: 7bit */
192	/* addresses are stored in the */
193	/* _LOWER_ 7 bits of this char */
194	/* addr: unsigned int to make lm_sensors i2c-isa adapter work
195	more cleanly. It does not take any more memory space, due to
196	alignment considerations */
197	struct i2c_adapter adapter; / the adapter we sit on */
198	struct i2c_driver driver; / and our access routines */
199	void data; / for the clients */
200	int usage_count; /* How many accesses currently */
201	/* to the client */
202	};
203
204
205	/*
206	* The following structs are for those who like to implement new bus drivers:
207	* i2c_algorithm is the interface to a class of hardware solutions which can
208	* be addressed using the same bus algorithms - i.e. bit-banging or the PCF8584
209	* to name two of the most common.
210	*/
211	struct i2c_algorithm {
212	char name[32]; /* textual description */
213	unsigned int id;
214
215	/* If an adapter algorithm can't to I2C-level access, set master_xfer
216	to NULL. If an adapter algorithm can do SMBus access, set
217	smbus_xfer. If set to NULL, the SMBus protocol is simulated
218	using common I2C messages */
219	int (master_xfer)(struct i2c_adapter adap,struct i2c_msg msgs[],
220	int num);
221	int (smbus_xfer) (struct i2c_adapter adap, u16 addr,
222	unsigned short flags, char read_write,
223	u8 command, int size, union i2c_smbus_data * data);
224
225	/* --- these optional/future use for some adapter types.*/
226	int (slave_send)(struct i2c_adapter ,char*,int);
227	int (slave_recv)(struct i2c_adapter ,char*,int);
228
229	/* --- ioctl like call to set div. parameters. */
230	int (algo_control)(struct i2c_adapter , unsigned int, unsigned long);
231
232	/* To determine what the adapter supports */
233	u32 (functionality) (struct i2c_adapter );
234	};
235
236	#if LINUX_VERSION_CODE < KERNEL_VERSION(2,1,29)
237	struct proc_dir_entry;
238	#endif
239
240	/*
241	* i2c_adapter is the structure used to identify a physical i2c bus along
242	* with the access algorithms necessary to access it.
243	*/
244	struct i2c_adapter {
245	char name[32]; /* some useful name to identify the adapter */
246	unsigned int id;/* == is algo->id \| hwdep.struct->id, */
247	/* for registered values see below */
248	struct i2c_algorithm algo;/ the algorithm to access the bus */
249	void *algo_data;
250
251	/* --- These may be NULL, but should increase the module use count */
252	void (inc_use)(struct i2c_adapter );
253	void (dec_use)(struct i2c_adapter );
254
255	/* --- administration stuff. */
256	int (client_register)(struct i2c_client );
257	int (client_unregister)(struct i2c_client );
258
259	void data; / private data for the adapter */
260	/* some data fields that are used by all types */
261	/* these data fields are readonly to the public */
262	/* and can be set via the i2c_ioctl call */
263
264	/* data fields that are valid for all devices */
265	struct semaphore lock;
266	unsigned int flags;/* flags specifying div. data */
267
268	struct i2c_client *clients[I2C_CLIENT_MAX];
269	int client_count;
270
271	int timeout;
272	int retries;
273
274	#ifdef CONFIG_PROC_FS
275	/* No need to set this when you initialize the adapter */
276	int inode;
277	#if LINUX_VERSION_CODE < KERNEL_VERSION(2,1,29)
278	struct proc_dir_entry *proc_entry;
279	#endif
280	#endif /* def CONFIG_PROC_FS */
281	};
282
283	/flags for the driver struct: /
284	#define I2C_DF_NOTIFY 0x01 /* notify on bus (de/a)ttaches */
285	#define I2C_DF_DUMMY 0x02 /* do not connect any clients */
286
287	/flags for the client struct: /
288	#define I2C_CLIENT_ALLOW_USE 0x01 /* Client allows access */
289	#define I2C_CLIENT_ALLOW_MULTIPLE_USE 0x02 /* Allow multiple access-locks */
290	/* on an i2c_client */
291	#define I2C_CLIENT_PEC 0x04 /* Use Packet Error Checking */
292	#define I2C_CLIENT_TEN 0x10 /* we have a ten bit chip address */
293	/* Must equal I2C_M_TEN below */
294
295	/* i2c_client_address_data is the struct for holding default client
296	* addresses for a driver and for the parameters supplied on the
297	* command line
298	*/
299	struct i2c_client_address_data {
300	unsigned short *normal_i2c;
301	unsigned short *normal_i2c_range;
302	unsigned short *probe;
303	unsigned short *probe_range;
304	unsigned short *ignore;
305	unsigned short *ignore_range;
306	unsigned short *force;
307	};
308
309	/* Internal numbers to terminate lists */
310	#define I2C_CLIENT_END 0xfffe
311
312	/* The numbers to use to set I2C bus address */
313	#define ANY_I2C_BUS 0xffff
314
315	/* The length of the option lists */
316	#define I2C_CLIENT_MAX_OPTS 48
317
318
319	/* ----- functions exported by i2c.o */
320
321	/* administration...
322	*/
323	extern int i2c_add_adapter(struct i2c_adapter *);
324	extern int i2c_del_adapter(struct i2c_adapter *);
325
326	extern int i2c_add_driver(struct i2c_driver *);
327	extern int i2c_del_driver(struct i2c_driver *);
328
329	extern int i2c_attach_client(struct i2c_client *);
330	extern int i2c_detach_client(struct i2c_client *);
331
332	/* Only call these if you grab a resource that makes unloading the
333	client and the adapter it is on completely impossible. Like when a
334	/proc directory is entered. */
335	extern void i2c_inc_use_client(struct i2c_client *);
336	extern void i2c_dec_use_client(struct i2c_client *);
337
338	/* New function: This is to get an i2c_client-struct for controlling the
339	client either by using i2c_control-function or having the
340	client-module export functions that can be used with the i2c_client
341	-struct. */
342	extern struct i2c_client *i2c_get_client(int driver_id, int adapter_id,
343	struct i2c_client *prev);
344
345	/* Should be used with new function
346	extern struct i2c_client i2c_get_client(int,int,struct i2c_client );
347	to make sure that client-struct is valid and that it is okay to access
348	the i2c-client.
349	returns -EACCES if client doesn't allow use (default)
350	returns -EBUSY if client doesn't allow multiple use (default) and
351	usage_count >0 */
352	extern int i2c_use_client(struct i2c_client *);
353	extern int i2c_release_client(struct i2c_client *);
354
355	/* returns -EBUSY if address has been taken, 0 if not. Note that the only
356	other place at which this is called is within i2c_attach_client; so
357	you can cheat by simply not registering. Not recommended, of course! */
358	extern int i2c_check_addr (struct i2c_adapter *adapter, int addr);
359
360	/* Detect function. It iterates over all possible addresses itself.
361	* It will only call found_proc if some client is connected at the
362	* specific address (unless a 'force' matched);
363	*/
364	typedef int i2c_client_found_addr_proc (struct i2c_adapter *adapter,
365	int addr, unsigned short flags,int kind);
366
367	extern int i2c_probe(struct i2c_adapter *adapter,
368	struct i2c_client_address_data *address_data,
369	i2c_client_found_addr_proc *found_proc);
370
371	/* An ioctl like call to set div. parameters of the adapter.
372	*/
373	extern int i2c_control(struct i2c_client *,unsigned int, unsigned long);
374
375	/* This call returns a unique low identifier for each registered adapter,
376	* or -1 if the adapter was not registered.
377	*/
378	extern int i2c_adapter_id(struct i2c_adapter *adap);
379
380
381
382	/* Return the functionality mask */
383	extern u32 i2c_get_functionality (struct i2c_adapter *adap);
384
385	/* Return 1 if adapter supports everything we need, 0 if not. */
386	extern int i2c_check_functionality (struct i2c_adapter *adap, u32 func);
387
388	#endif /* __KERNEL__ */
389
390	/*
391	* I2C Message - used for pure i2c transaction, also from /dev interface
392	*/
393	struct i2c_msg {
394	__u16 addr; /* slave address */
395	unsigned short flags;
396	#define I2C_M_TEN 0x10 /* we have a ten bit chip address */
397	#define I2C_M_RD 0x01
398	#define I2C_M_NOSTART 0x4000
399	#define I2C_M_REV_DIR_ADDR 0x2000
400	#define I2C_M_IGNORE_NAK 0x1000
401	#define I2C_M_NO_RD_ACK 0x0800
402	short len; /* msg length */
403	char buf; / pointer to msg data */
404	};
405
406	/* To determine what functionality is present */
407
408	#define I2C_FUNC_I2C 0x00000001
409	#define I2C_FUNC_10BIT_ADDR 0x00000002
410	#define I2C_FUNC_PROTOCOL_MANGLING 0x00000004 /* I2C_M_{REV_DIR_ADDR,NOSTART,..} */
411	#define I2C_FUNC_SMBUS_HWPEC_CALC 0x00000008 /* SMBus 2.0 */
412	#define I2C_FUNC_SMBUS_READ_WORD_DATA_PEC 0x00000800 /* SMBus 2.0 */
413	#define I2C_FUNC_SMBUS_WRITE_WORD_DATA_PEC 0x00001000 /* SMBus 2.0 */
414	#define I2C_FUNC_SMBUS_PROC_CALL_PEC 0x00002000 /* SMBus 2.0 */
415	#define I2C_FUNC_SMBUS_BLOCK_PROC_CALL_PEC 0x00004000 /* SMBus 2.0 */
416	#define I2C_FUNC_SMBUS_BLOCK_PROC_CALL 0x00008000 /* SMBus 2.0 */
417	#define I2C_FUNC_SMBUS_QUICK 0x00010000
418	#define I2C_FUNC_SMBUS_READ_BYTE 0x00020000
419	#define I2C_FUNC_SMBUS_WRITE_BYTE 0x00040000
420	#define I2C_FUNC_SMBUS_READ_BYTE_DATA 0x00080000
421	#define I2C_FUNC_SMBUS_WRITE_BYTE_DATA 0x00100000
422	#define I2C_FUNC_SMBUS_READ_WORD_DATA 0x00200000
423	#define I2C_FUNC_SMBUS_WRITE_WORD_DATA 0x00400000
424	#define I2C_FUNC_SMBUS_PROC_CALL 0x00800000
425	#define I2C_FUNC_SMBUS_READ_BLOCK_DATA 0x01000000
426	#define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA 0x02000000
427	#define I2C_FUNC_SMBUS_READ_I2C_BLOCK 0x04000000 /* I2C-like block xfer */
428	#define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK 0x08000000 /* w/ 1-byte reg. addr. */
429	#define I2C_FUNC_SMBUS_READ_I2C_BLOCK_2 0x10000000 /* I2C-like block xfer */
430	#define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK_2 0x20000000 /* w/ 2-byte reg. addr. */
431	#define I2C_FUNC_SMBUS_READ_BLOCK_DATA_PEC 0x40000000 /* SMBus 2.0 */
432	#define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA_PEC 0x80000000 /* SMBus 2.0 */
433
434	#define I2C_FUNC_SMBUS_BYTE I2C_FUNC_SMBUS_READ_BYTE \| \
435	I2C_FUNC_SMBUS_WRITE_BYTE
436	#define I2C_FUNC_SMBUS_BYTE_DATA I2C_FUNC_SMBUS_READ_BYTE_DATA \| \
437	I2C_FUNC_SMBUS_WRITE_BYTE_DATA
438	#define I2C_FUNC_SMBUS_WORD_DATA I2C_FUNC_SMBUS_READ_WORD_DATA \| \
439	I2C_FUNC_SMBUS_WRITE_WORD_DATA
440	#define I2C_FUNC_SMBUS_BLOCK_DATA I2C_FUNC_SMBUS_READ_BLOCK_DATA \| \
441	I2C_FUNC_SMBUS_WRITE_BLOCK_DATA
442	#define I2C_FUNC_SMBUS_I2C_BLOCK I2C_FUNC_SMBUS_READ_I2C_BLOCK \| \
443	I2C_FUNC_SMBUS_WRITE_I2C_BLOCK
444	#define I2C_FUNC_SMBUS_I2C_BLOCK_2 I2C_FUNC_SMBUS_READ_I2C_BLOCK_2 \| \
445	I2C_FUNC_SMBUS_WRITE_I2C_BLOCK_2
446	#define I2C_FUNC_SMBUS_BLOCK_DATA_PEC I2C_FUNC_SMBUS_READ_BLOCK_DATA_PEC \| \
447	I2C_FUNC_SMBUS_WRITE_BLOCK_DATA_PEC
448	#define I2C_FUNC_SMBUS_WORD_DATA_PEC I2C_FUNC_SMBUS_READ_WORD_DATA_PEC \| \
449	I2C_FUNC_SMBUS_WRITE_WORD_DATA_PEC
450
451	#define I2C_FUNC_SMBUS_READ_BYTE_PEC I2C_FUNC_SMBUS_READ_BYTE_DATA
452	#define I2C_FUNC_SMBUS_WRITE_BYTE_PEC I2C_FUNC_SMBUS_WRITE_BYTE_DATA
453	#define I2C_FUNC_SMBUS_READ_BYTE_DATA_PEC I2C_FUNC_SMBUS_READ_WORD_DATA
454	#define I2C_FUNC_SMBUS_WRITE_BYTE_DATA_PEC I2C_FUNC_SMBUS_WRITE_WORD_DATA
455	#define I2C_FUNC_SMBUS_BYTE_PEC I2C_FUNC_SMBUS_BYTE_DATA
456	#define I2C_FUNC_SMBUS_BYTE_DATA_PEC I2C_FUNC_SMBUS_WORD_DATA
457
458	#define I2C_FUNC_SMBUS_EMUL I2C_FUNC_SMBUS_QUICK \| \
459	I2C_FUNC_SMBUS_BYTE \| \
460	I2C_FUNC_SMBUS_BYTE_DATA \| \
461	I2C_FUNC_SMBUS_WORD_DATA \| \
462	I2C_FUNC_SMBUS_PROC_CALL \| \
463	I2C_FUNC_SMBUS_WRITE_BLOCK_DATA \| \
464	I2C_FUNC_SMBUS_WRITE_BLOCK_DATA_PEC \| \
465	I2C_FUNC_SMBUS_I2C_BLOCK
466
467	/*
468	* Data for SMBus Messages
469	*/
470	#define I2C_SMBUS_BLOCK_MAX 32 /* As specified in SMBus standard */
471	#define I2C_SMBUS_I2C_BLOCK_MAX 32 /* Not specified but we use same structure */
472	union i2c_smbus_data {
473	__u8 byte;
474	__u16 word;
475	__u8 block[I2C_SMBUS_BLOCK_MAX + 3]; /* block[0] is used for length */
476	/* one more for read length in block process call */
477	/* and one more for PEC */
478	};
479
480	/* smbus_access read or write markers */
481	#define I2C_SMBUS_READ 1
482	#define I2C_SMBUS_WRITE 0
483
484	/* SMBus transaction types (size parameter in the above functions)
485	Note: these no longer correspond to the (arbitrary) PIIX4 internal codes! */
486	#define I2C_SMBUS_QUICK 0
487	#define I2C_SMBUS_BYTE 1
488	#define I2C_SMBUS_BYTE_DATA 2
489	#define I2C_SMBUS_WORD_DATA 3
490	#define I2C_SMBUS_PROC_CALL 4
491	#define I2C_SMBUS_BLOCK_DATA 5
492	#define I2C_SMBUS_I2C_BLOCK_DATA 6
493	#define I2C_SMBUS_BLOCK_PROC_CALL 7 /* SMBus 2.0 */
494	#define I2C_SMBUS_BLOCK_DATA_PEC 8 /* SMBus 2.0 */
495	#define I2C_SMBUS_PROC_CALL_PEC 9 /* SMBus 2.0 */
496	#define I2C_SMBUS_BLOCK_PROC_CALL_PEC 10 /* SMBus 2.0 */
497	#define I2C_SMBUS_WORD_DATA_PEC 11 /* SMBus 2.0 */
498
499
500	/* ----- commands for the ioctl like i2c_command call:
501	* note that additional calls are defined in the algorithm and hw
502	* dependent layers - these can be listed here, or see the
503	* corresponding header files.
504	*/
505	/* -> bit-adapter specific ioctls */
506	#define I2C_RETRIES 0x0701 /* number of times a device address */
507	/* should be polled when not */
508	/* acknowledging */
509	#define I2C_TIMEOUT 0x0702 /* set timeout - call with int */
510
511
512	/* this is for i2c-dev.c */
513	#define I2C_SLAVE 0x0703 /* Change slave address */
514	/* Attn.: Slave address is 7 or 10 bits */
515	#define I2C_SLAVE_FORCE 0x0706 /* Change slave address */
516	/* Attn.: Slave address is 7 or 10 bits */
517	/* This changes the address, even if it */
518	/* is already taken! */
519	#define I2C_TENBIT 0x0704 /* 0 for 7 bit addrs, != 0 for 10 bit */
520
521	#define I2C_FUNCS 0x0705 /* Get the adapter functionality */
522	#define I2C_RDWR 0x0707 /* Combined R/W transfer (one stop only)*/
523	#define I2C_PEC 0x0708 /* != 0 for SMBus PEC */
524	#if 0
525	#define I2C_ACK_TEST 0x0710 /* See if a slave is at a specific address */
526	#endif
527
528	#define I2C_SMBUS 0x0720 /* SMBus-level access */
529
530	/* ... algo-bit.c recognizes */
531	#define I2C_UDELAY 0x0705 /* set delay in microsecs between each */
532	/* written byte (except address) */
533	#define I2C_MDELAY 0x0706 /* millisec delay between written bytes */
534
535	/* ----- I2C-DEV: char device interface stuff ------------------------- */
536
537	#define I2C_MAJOR 89 /* Device major number */
538
539	#ifdef __KERNEL__
540
541	# ifndef NULL
542	# define NULL ( (void *) 0 )
543	# endif
544
545	# ifndef ENODEV
546	# include <asm/errno.h>
547	# endif
548
549	/* These defines are used for probing i2c client addresses */
550	/* Default fill of many variables */
551	#define I2C_CLIENT_DEFAULTS {I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
552	I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
553	I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
554	I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
555	I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
556	I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
557	I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
558	I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
559	I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
560	I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
561	I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
562	I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
563	I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
564	I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
565	I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
566	I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END}
567
568	/* This is ugly. We need to evaluate I2C_CLIENT_MAX_OPTS before it is
569	stringified */
570	#define I2C_CLIENT_MODPARM_AUX1(x) "1-" #x "h"
571	#define I2C_CLIENT_MODPARM_AUX(x) I2C_CLIENT_MODPARM_AUX1(x)
572	#define I2C_CLIENT_MODPARM I2C_CLIENT_MODPARM_AUX(I2C_CLIENT_MAX_OPTS)
573
574	/* I2C_CLIENT_MODULE_PARM creates a module parameter, and puts it in the
575	module header */
576
577	#define I2C_CLIENT_MODULE_PARM(var,desc) \
578	static unsigned short var[I2C_CLIENT_MAX_OPTS] = I2C_CLIENT_DEFAULTS; \
579	MODULE_PARM(var,I2C_CLIENT_MODPARM); \
580	MODULE_PARM_DESC(var,desc)
581
582	/* This is the one you want to use in your own modules */
583	#define I2C_CLIENT_INSMOD \
584	I2C_CLIENT_MODULE_PARM(probe, \
585	"List of adapter,address pairs to scan additionally"); \
586	I2C_CLIENT_MODULE_PARM(probe_range, \
587	"List of adapter,start-addr,end-addr triples to scan " \
588	"additionally"); \
589	I2C_CLIENT_MODULE_PARM(ignore, \
590	"List of adapter,address pairs not to scan"); \
591	I2C_CLIENT_MODULE_PARM(ignore_range, \
592	"List of adapter,start-addr,end-addr triples not to " \
593	"scan"); \
594	I2C_CLIENT_MODULE_PARM(force, \
595	"List of adapter,address pairs to boldly assume " \
596	"to be present"); \
597	static struct i2c_client_address_data addr_data = \
598	{normal_i2c, normal_i2c_range, \
599	probe, probe_range, \
600	ignore, ignore_range, \
601	force}
602
603	/* Detect whether we are on the isa bus. If this returns true, all i2c
604	access will fail! */
605	#define i2c_is_isa_client(clientptr) \
606	((clientptr)->adapter->algo->id == I2C_ALGO_ISA)
607	#define i2c_is_isa_adapter(adapptr) \
608	((adapptr)->algo->id == I2C_ALGO_ISA)
609
610	#endif /* def __KERNEL__ */
611	#endif /* I2C_H */

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