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i2c.h @ 3527

Revision 3527, 20.9 KB (checked in by mds, 12 years ago)

Copy sensors.c and sensors.h from the lm_sensors package and

name them i2c-proc.c and i2c-proc.h.
Add DEVICEID's from sensors.h to i2c-id.h.
Add #defines from i2c-isa.h in lm_sensors to i2c.h.
Update mkpatch for i2c-proc.[ch].

Property svn:eol-style set to native
Property svn:keywords set to Author Date Id Revision

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

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