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i2c.h @ 3799

Revision 3799, 22.4 KB (checked in by mds, 10 years ago)
EINVAL patch from P.P.
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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 _LINUX_I2C_H
29	#define _LINUX_I2C_H
30
31	#define I2C_DATE "2003xxxx"
32	#define I2C_VERSION "2.8.0-CVS"
33
34	#include <linux/module.h>
35	#include <linux/types.h>
36	#include <linux/errno.h>
37	#include <asm/semaphore.h>
38	#include "i2c-id.h"
39
40	#if LINUX_VERSION_CODE < KERNEL_VERSION(2,4,10)
41	#define MODULE_LICENSE(x)
42	#endif
43
44	/* --- General options ------------------------------------------------ */
45
46	#define I2C_ALGO_MAX 4 /* control memory consumption */
47	#define I2C_ADAP_MAX 16
48	#define I2C_DRIVER_MAX 16
49	#define I2C_CLIENT_MAX 32
50	#define I2C_DUMMY_MAX 4
51
52	struct i2c_msg;
53	struct i2c_algorithm;
54	struct i2c_adapter;
55	struct i2c_client;
56	struct i2c_driver;
57	struct i2c_client_address_data;
58	union i2c_smbus_data;
59
60	/*
61	* The master routines are the ones normally used to transmit data to devices
62	* on a bus (or read from them). Apart from two basic transfer functions to
63	* transmit one message at a time, a more complex version can be used to
64	* transmit an arbitrary number of messages without interruption.
65	*/
66	extern int i2c_master_send(struct i2c_client ,const char ,int);
67	extern int i2c_master_recv(struct i2c_client ,char ,int);
68
69	/* Transfer num messages.
70	*/
71	extern int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg msg[],int num);
72
73	/*
74	* Some adapter types (i.e. PCF 8584 based ones) may support slave behaviuor.
75	* This is not tested/implemented yet and will change in the future.
76	*/
77	extern int i2c_slave_send(struct i2c_client ,char,int);
78	extern int i2c_slave_recv(struct i2c_client ,char,int);
79
80
81
82	/* This is the very generalized SMBus access routine. You probably do not
83	want to use this, though; one of the functions below may be much easier,
84	and probably just as fast.
85	Note that we use i2c_adapter here, because you do not need a specific
86	smbus adapter to call this function. */
87	extern s32 i2c_smbus_xfer (struct i2c_adapter * adapter, u16 addr,
88	unsigned short flags,
89	char read_write, u8 command, int size,
90	union i2c_smbus_data * data);
91
92	/* Now follow the 'nice' access routines. These also document the calling
93	conventions of smbus_access. */
94
95	extern s32 i2c_smbus_write_quick(struct i2c_client * client, u8 value);
96	extern s32 i2c_smbus_read_byte(struct i2c_client * client);
97	extern s32 i2c_smbus_write_byte(struct i2c_client * client, u8 value);
98	extern s32 i2c_smbus_read_byte_data(struct i2c_client * client, u8 command);
99	extern s32 i2c_smbus_write_byte_data(struct i2c_client * client,
100	u8 command, u8 value);
101	extern s32 i2c_smbus_read_word_data(struct i2c_client * client, u8 command);
102	extern s32 i2c_smbus_write_word_data(struct i2c_client * client,
103	u8 command, u16 value);
104	extern s32 i2c_smbus_process_call(struct i2c_client * client,
105	u8 command, u16 value);
106	/* Returns the number of read bytes */
107	extern s32 i2c_smbus_read_block_data(struct i2c_client * client,
108	u8 command, u8 *values);
109	extern s32 i2c_smbus_write_block_data(struct i2c_client * client,
110	u8 command, u8 length,
111	u8 *values);
112	extern s32 i2c_smbus_read_i2c_block_data(struct i2c_client * client,
113	u8 command, u8 *values);
114	extern s32 i2c_smbus_write_i2c_block_data(struct i2c_client * client,
115	u8 command, u8 length,
116	u8 *values);
117
118
119	/*
120	* A driver is capable of handling one or more physical devices present on
121	* I2C adapters. This information is used to inform the driver of adapter
122	* events.
123	*/
124
125	struct i2c_driver {
126	struct module *owner;
127	char name[32];
128	int id;
129	unsigned int flags; /* div., see below */
130
131	/* Notifies the driver that a new bus has appeared. This routine
132	* can be used by the driver to test if the bus meets its conditions
133	* & seek for the presence of the chip(s) it supports. If found, it
134	* registers the client(s) that are on the bus to the i2c admin. via
135	* i2c_attach_client.
136	*/
137	int (attach_adapter)(struct i2c_adapter );
138
139	/* tells the driver that a client is about to be deleted & gives it
140	* the chance to remove its private data. Also, if the client struct
141	* has been dynamically allocated by the driver in the function above,
142	* it must be freed here.
143	*/
144	int (detach_client)(struct i2c_client );
145
146	/* a ioctl like command that can be used to perform specific functions
147	* with the device.
148	*/
149	int (command)(struct i2c_client client,unsigned int cmd, void *arg);
150	};
151
152	/*
153	* i2c_client identifies a single device (i.e. chip) that is connected to an
154	* i2c bus. The behaviour is defined by the routines of the driver. This
155	* function is mainly used for lookup & other admin. functions.
156	*/
157	struct i2c_client {
158	char name[32];
159	int id;
160	unsigned int flags; /* div., see below */
161	unsigned int addr; /* chip address - NOTE: 7bit */
162	/* addresses are stored in the */
163	/* _LOWER_ 7 bits of this char */
164	/* addr: unsigned int to make lm_sensors i2c-isa adapter work
165	more cleanly. It does not take any more memory space, due to
166	alignment considerations */
167	struct i2c_adapter adapter; / the adapter we sit on */
168	struct i2c_driver driver; / and our access routines */
169	void data; / for the clients */
170	int usage_count; /* How many accesses currently */
171	/* to the client */
172	};
173
174
175	/*
176	* The following structs are for those who like to implement new bus drivers:
177	* i2c_algorithm is the interface to a class of hardware solutions which can
178	* be addressed using the same bus algorithms - i.e. bit-banging or the PCF8584
179	* to name two of the most common.
180	*/
181	struct i2c_algorithm {
182	struct module owner; / future use --km */
183	char name[32]; /* textual description */
184	unsigned int id;
185
186	/* If an adapter algorithm can't to I2C-level access, set master_xfer
187	to NULL. If an adapter algorithm can do SMBus access, set
188	smbus_xfer. If set to NULL, the SMBus protocol is simulated
189	using common I2C messages */
190	int (master_xfer)(struct i2c_adapter adap,struct i2c_msg msgs[],
191	int num);
192	int (smbus_xfer) (struct i2c_adapter adap, u16 addr,
193	unsigned short flags, char read_write,
194	u8 command, int size, union i2c_smbus_data * data);
195
196	/* --- these optional/future use for some adapter types.*/
197	int (slave_send)(struct i2c_adapter ,char*,int);
198	int (slave_recv)(struct i2c_adapter ,char*,int);
199
200	/* --- ioctl like call to set div. parameters. */
201	int (algo_control)(struct i2c_adapter , unsigned int, unsigned long);
202
203	/* To determine what the adapter supports */
204	u32 (functionality) (struct i2c_adapter );
205	};
206
207	/*
208	* i2c_adapter is the structure used to identify a physical i2c bus along
209	* with the access algorithms necessary to access it.
210	*/
211	struct i2c_adapter {
212	struct module *owner;
213	char name[32]; /* some useful name to identify the adapter */
214	unsigned int id;/* == is algo->id \| hwdep.struct->id, */
215	/* for registered values see below */
216	struct i2c_algorithm algo;/ the algorithm to access the bus */
217	void *algo_data;
218
219	/* --- administration stuff. */
220	int (client_register)(struct i2c_client );
221	int (client_unregister)(struct i2c_client );
222
223	void data; / private data for the adapter */
224	/* some data fields that are used by all types */
225	/* these data fields are readonly to the public */
226	/* and can be set via the i2c_ioctl call */
227
228	/* data fields that are valid for all devices */
229	struct semaphore bus;
230	struct semaphore list;
231	unsigned int flags;/* flags specifying div. data */
232
233	struct i2c_client *clients[I2C_CLIENT_MAX];
234
235	int timeout;
236	int retries;
237
238	#ifdef CONFIG_PROC_FS
239	/* No need to set this when you initialize the adapter */
240	int inode;
241	#endif /* def CONFIG_PROC_FS */
242	};
243
244	/flags for the driver struct: /
245	#define I2C_DF_NOTIFY 0x01 /* notify on bus (de/a)ttaches */
246	#define I2C_DF_DUMMY 0x02 /* do not connect any clients */
247
248	/flags for the client struct: /
249	#define I2C_CLIENT_ALLOW_USE 0x01 /* Client allows access */
250	#define I2C_CLIENT_ALLOW_MULTIPLE_USE 0x02 /* Allow multiple access-locks */
251	/* on an i2c_client */
252	#define I2C_CLIENT_PEC 0x04 /* Use Packet Error Checking */
253	#define I2C_CLIENT_TEN 0x10 /* we have a ten bit chip address */
254	/* Must equal I2C_M_TEN below */
255
256	/* i2c_client_address_data is the struct for holding default client
257	* addresses for a driver and for the parameters supplied on the
258	* command line
259	*/
260	struct i2c_client_address_data {
261	unsigned short *normal_i2c;
262	unsigned short *normal_i2c_range;
263	unsigned short *probe;
264	unsigned short *probe_range;
265	unsigned short *ignore;
266	unsigned short *ignore_range;
267	unsigned short *force;
268	};
269
270	/* Internal numbers to terminate lists */
271	#define I2C_CLIENT_END 0xfffe
272
273	/* The numbers to use to set I2C bus address */
274	#define ANY_I2C_BUS 0xffff
275
276	/* The length of the option lists */
277	#define I2C_CLIENT_MAX_OPTS 48
278
279
280	/* ----- functions exported by i2c.o */
281
282	/* administration...
283	*/
284	extern int i2c_add_adapter(struct i2c_adapter *);
285	extern int i2c_del_adapter(struct i2c_adapter *);
286
287	extern int i2c_add_driver(struct i2c_driver *);
288	extern int i2c_del_driver(struct i2c_driver *);
289
290	extern int i2c_attach_client(struct i2c_client *);
291	extern int i2c_detach_client(struct i2c_client *);
292
293	/* New function: This is to get an i2c_client-struct for controlling the
294	client either by using i2c_control-function or having the
295	client-module export functions that can be used with the i2c_client
296	-struct. */
297	extern struct i2c_client *i2c_get_client(int driver_id, int adapter_id,
298	struct i2c_client *prev);
299
300	/* Should be used with new function
301	extern struct i2c_client i2c_get_client(int,int,struct i2c_client );
302	to make sure that client-struct is valid and that it is okay to access
303	the i2c-client.
304	returns -EACCES if client doesn't allow use (default)
305	returns -EBUSY if client doesn't allow multiple use (default) and
306	usage_count >0 */
307	extern int i2c_use_client(struct i2c_client *);
308	extern int i2c_release_client(struct i2c_client *);
309
310	/* returns -EBUSY if address has been taken, 0 if not. Note that the only
311	other place at which this is called is within i2c_attach_client; so
312	you can cheat by simply not registering. Not recommended, of course! */
313	extern int i2c_check_addr (struct i2c_adapter *adapter, int addr);
314
315	/* Detect function. It iterates over all possible addresses itself.
316	* It will only call found_proc if some client is connected at the
317	* specific address (unless a 'force' matched);
318	*/
319	typedef int i2c_client_found_addr_proc (struct i2c_adapter *adapter,
320	int addr, unsigned short flags,int kind);
321
322	extern int i2c_probe(struct i2c_adapter *adapter,
323	struct i2c_client_address_data *address_data,
324	i2c_client_found_addr_proc *found_proc);
325
326	static inline int i2c_client_command(struct i2c_client *client,
327	unsigned int cmd, void *arg)
328	{
329	if (client->driver && client->driver->command)
330	return client->driver->command(client, cmd, arg);
331	else
332	return -EINVAL;
333	}
334
335	/* An ioctl like call to set div. parameters of the adapter.
336	*/
337	extern int i2c_control(struct i2c_client *,unsigned int, unsigned long);
338
339	/* This call returns a unique low identifier for each registered adapter,
340	* or -1 if the adapter was not registered.
341	*/
342	extern int i2c_adapter_id(struct i2c_adapter *adap);
343
344
345
346	/* Return the functionality mask */
347	extern u32 i2c_get_functionality (struct i2c_adapter *adap);
348
349	/* Return 1 if adapter supports everything we need, 0 if not. */
350	extern int i2c_check_functionality (struct i2c_adapter *adap, u32 func);
351
352	/*
353	* I2C Message - used for pure i2c transaction, also from /dev interface
354	*/
355	struct i2c_msg {
356	__u16 addr; /* slave address */
357	unsigned short flags;
358	#define I2C_M_TEN 0x10 /* we have a ten bit chip address */
359	#define I2C_M_RD 0x01
360	#define I2C_M_NOSTART 0x4000
361	#define I2C_M_REV_DIR_ADDR 0x2000
362	#define I2C_M_IGNORE_NAK 0x1000
363	#define I2C_M_NO_RD_ACK 0x0800
364	short len; /* msg length */
365	char buf; / pointer to msg data */
366	int err;
367	short done;
368	};
369
370	/* To determine what functionality is present */
371
372	#define I2C_FUNC_I2C 0x00000001
373	#define I2C_FUNC_10BIT_ADDR 0x00000002
374	#define I2C_FUNC_PROTOCOL_MANGLING 0x00000004 /* I2C_M_{REV_DIR_ADDR,NOSTART,..} */
375	#define I2C_FUNC_SMBUS_HWPEC_CALC 0x00000008 /* SMBus 2.0 */
376	#define I2C_FUNC_SMBUS_READ_WORD_DATA_PEC 0x00000800 /* SMBus 2.0 */
377	#define I2C_FUNC_SMBUS_WRITE_WORD_DATA_PEC 0x00001000 /* SMBus 2.0 */
378	#define I2C_FUNC_SMBUS_PROC_CALL_PEC 0x00002000 /* SMBus 2.0 */
379	#define I2C_FUNC_SMBUS_BLOCK_PROC_CALL_PEC 0x00004000 /* SMBus 2.0 */
380	#define I2C_FUNC_SMBUS_BLOCK_PROC_CALL 0x00008000 /* SMBus 2.0 */
381	#define I2C_FUNC_SMBUS_QUICK 0x00010000
382	#define I2C_FUNC_SMBUS_READ_BYTE 0x00020000
383	#define I2C_FUNC_SMBUS_WRITE_BYTE 0x00040000
384	#define I2C_FUNC_SMBUS_READ_BYTE_DATA 0x00080000
385	#define I2C_FUNC_SMBUS_WRITE_BYTE_DATA 0x00100000
386	#define I2C_FUNC_SMBUS_READ_WORD_DATA 0x00200000
387	#define I2C_FUNC_SMBUS_WRITE_WORD_DATA 0x00400000
388	#define I2C_FUNC_SMBUS_PROC_CALL 0x00800000
389	#define I2C_FUNC_SMBUS_READ_BLOCK_DATA 0x01000000
390	#define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA 0x02000000
391	#define I2C_FUNC_SMBUS_READ_I2C_BLOCK 0x04000000 /* I2C-like block xfer */
392	#define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK 0x08000000 /* w/ 1-byte reg. addr. */
393	#define I2C_FUNC_SMBUS_READ_I2C_BLOCK_2 0x10000000 /* I2C-like block xfer */
394	#define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK_2 0x20000000 /* w/ 2-byte reg. addr. */
395	#define I2C_FUNC_SMBUS_READ_BLOCK_DATA_PEC 0x40000000 /* SMBus 2.0 */
396	#define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA_PEC 0x80000000 /* SMBus 2.0 */
397
398	#define I2C_FUNC_SMBUS_BYTE I2C_FUNC_SMBUS_READ_BYTE \| \
399	I2C_FUNC_SMBUS_WRITE_BYTE
400	#define I2C_FUNC_SMBUS_BYTE_DATA I2C_FUNC_SMBUS_READ_BYTE_DATA \| \
401	I2C_FUNC_SMBUS_WRITE_BYTE_DATA
402	#define I2C_FUNC_SMBUS_WORD_DATA I2C_FUNC_SMBUS_READ_WORD_DATA \| \
403	I2C_FUNC_SMBUS_WRITE_WORD_DATA
404	#define I2C_FUNC_SMBUS_BLOCK_DATA I2C_FUNC_SMBUS_READ_BLOCK_DATA \| \
405	I2C_FUNC_SMBUS_WRITE_BLOCK_DATA
406	#define I2C_FUNC_SMBUS_I2C_BLOCK I2C_FUNC_SMBUS_READ_I2C_BLOCK \| \
407	I2C_FUNC_SMBUS_WRITE_I2C_BLOCK
408	#define I2C_FUNC_SMBUS_I2C_BLOCK_2 I2C_FUNC_SMBUS_READ_I2C_BLOCK_2 \| \
409	I2C_FUNC_SMBUS_WRITE_I2C_BLOCK_2
410	#define I2C_FUNC_SMBUS_BLOCK_DATA_PEC I2C_FUNC_SMBUS_READ_BLOCK_DATA_PEC \| \
411	I2C_FUNC_SMBUS_WRITE_BLOCK_DATA_PEC
412	#define I2C_FUNC_SMBUS_WORD_DATA_PEC I2C_FUNC_SMBUS_READ_WORD_DATA_PEC \| \
413	I2C_FUNC_SMBUS_WRITE_WORD_DATA_PEC
414
415	#define I2C_FUNC_SMBUS_READ_BYTE_PEC I2C_FUNC_SMBUS_READ_BYTE_DATA
416	#define I2C_FUNC_SMBUS_WRITE_BYTE_PEC I2C_FUNC_SMBUS_WRITE_BYTE_DATA
417	#define I2C_FUNC_SMBUS_READ_BYTE_DATA_PEC I2C_FUNC_SMBUS_READ_WORD_DATA
418	#define I2C_FUNC_SMBUS_WRITE_BYTE_DATA_PEC I2C_FUNC_SMBUS_WRITE_WORD_DATA
419	#define I2C_FUNC_SMBUS_BYTE_PEC I2C_FUNC_SMBUS_BYTE_DATA
420	#define I2C_FUNC_SMBUS_BYTE_DATA_PEC I2C_FUNC_SMBUS_WORD_DATA
421
422	#define I2C_FUNC_SMBUS_EMUL I2C_FUNC_SMBUS_QUICK \| \
423	I2C_FUNC_SMBUS_BYTE \| \
424	I2C_FUNC_SMBUS_BYTE_DATA \| \
425	I2C_FUNC_SMBUS_WORD_DATA \| \
426	I2C_FUNC_SMBUS_PROC_CALL \| \
427	I2C_FUNC_SMBUS_WRITE_BLOCK_DATA \| \
428	I2C_FUNC_SMBUS_WRITE_BLOCK_DATA_PEC \| \
429	I2C_FUNC_SMBUS_I2C_BLOCK
430
431	/*
432	* Data for SMBus Messages
433	*/
434	#define I2C_SMBUS_BLOCK_MAX 32 /* As specified in SMBus standard */
435	#define I2C_SMBUS_I2C_BLOCK_MAX 32 /* Not specified but we use same structure */
436	union i2c_smbus_data {
437	__u8 byte;
438	__u16 word;
439	__u8 block[I2C_SMBUS_BLOCK_MAX + 3]; /* block[0] is used for length */
440	/* one more for read length in block process call */
441	/* and one more for PEC */
442	};
443
444	/* smbus_access read or write markers */
445	#define I2C_SMBUS_READ 1
446	#define I2C_SMBUS_WRITE 0
447
448	/* SMBus transaction types (size parameter in the above functions)
449	Note: these no longer correspond to the (arbitrary) PIIX4 internal codes! */
450	#define I2C_SMBUS_QUICK 0
451	#define I2C_SMBUS_BYTE 1
452	#define I2C_SMBUS_BYTE_DATA 2
453	#define I2C_SMBUS_WORD_DATA 3
454	#define I2C_SMBUS_PROC_CALL 4
455	#define I2C_SMBUS_BLOCK_DATA 5
456	#define I2C_SMBUS_I2C_BLOCK_DATA 6
457	#define I2C_SMBUS_BLOCK_PROC_CALL 7 /* SMBus 2.0 */
458	#define I2C_SMBUS_BLOCK_DATA_PEC 8 /* SMBus 2.0 */
459	#define I2C_SMBUS_PROC_CALL_PEC 9 /* SMBus 2.0 */
460	#define I2C_SMBUS_BLOCK_PROC_CALL_PEC 10 /* SMBus 2.0 */
461	#define I2C_SMBUS_WORD_DATA_PEC 11 /* SMBus 2.0 */
462
463
464	/* ----- commands for the ioctl like i2c_command call:
465	* note that additional calls are defined in the algorithm and hw
466	* dependent layers - these can be listed here, or see the
467	* corresponding header files.
468	*/
469	/* -> bit-adapter specific ioctls */
470	#define I2C_RETRIES 0x0701 /* number of times a device address */
471	/* should be polled when not */
472	/* acknowledging */
473	#define I2C_TIMEOUT 0x0702 /* set timeout - call with int */
474
475
476	/* this is for i2c-dev.c */
477	#define I2C_SLAVE 0x0703 /* Change slave address */
478	/* Attn.: Slave address is 7 or 10 bits */
479	#define I2C_SLAVE_FORCE 0x0706 /* Change slave address */
480	/* Attn.: Slave address is 7 or 10 bits */
481	/* This changes the address, even if it */
482	/* is already taken! */
483	#define I2C_TENBIT 0x0704 /* 0 for 7 bit addrs, != 0 for 10 bit */
484
485	#define I2C_FUNCS 0x0705 /* Get the adapter functionality */
486	#define I2C_RDWR 0x0707 /* Combined R/W transfer (one stop only)*/
487	#define I2C_PEC 0x0708 /* != 0 for SMBus PEC */
488	#if 0
489	#define I2C_ACK_TEST 0x0710 /* See if a slave is at a specific address */
490	#endif
491
492	#define I2C_SMBUS 0x0720 /* SMBus-level access */
493
494	/* ... algo-bit.c recognizes */
495	#define I2C_UDELAY 0x0705 /* set delay in microsecs between each */
496	/* written byte (except address) */
497	#define I2C_MDELAY 0x0706 /* millisec delay between written bytes */
498
499	/* ----- I2C-DEV: char device interface stuff ------------------------- */
500
501	#define I2C_MAJOR 89 /* Device major number */
502
503	/* These defines are used for probing i2c client addresses */
504	/* Default fill of many variables */
505	#define I2C_CLIENT_DEFAULTS {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	I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
517	I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
518	I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
519	I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
520	I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END}
521
522	/* This is ugly. We need to evaluate I2C_CLIENT_MAX_OPTS before it is
523	stringified */
524	#define I2C_CLIENT_MODPARM_AUX1(x) "1-" #x "h"
525	#define I2C_CLIENT_MODPARM_AUX(x) I2C_CLIENT_MODPARM_AUX1(x)
526	#define I2C_CLIENT_MODPARM I2C_CLIENT_MODPARM_AUX(I2C_CLIENT_MAX_OPTS)
527
528	/* I2C_CLIENT_MODULE_PARM creates a module parameter, and puts it in the
529	module header */
530
531	#define I2C_CLIENT_MODULE_PARM(var,desc) \
532	static unsigned short var[I2C_CLIENT_MAX_OPTS] = I2C_CLIENT_DEFAULTS; \
533	MODULE_PARM(var,I2C_CLIENT_MODPARM); \
534	MODULE_PARM_DESC(var,desc)
535
536	/* This is the one you want to use in your own modules */
537	#define I2C_CLIENT_INSMOD \
538	I2C_CLIENT_MODULE_PARM(probe, \
539	"List of adapter,address pairs to scan additionally"); \
540	I2C_CLIENT_MODULE_PARM(probe_range, \
541	"List of adapter,start-addr,end-addr triples to scan " \
542	"additionally"); \
543	I2C_CLIENT_MODULE_PARM(ignore, \
544	"List of adapter,address pairs not to scan"); \
545	I2C_CLIENT_MODULE_PARM(ignore_range, \
546	"List of adapter,start-addr,end-addr triples not to " \
547	"scan"); \
548	I2C_CLIENT_MODULE_PARM(force, \
549	"List of adapter,address pairs to boldly assume " \
550	"to be present"); \
551	static struct i2c_client_address_data addr_data = \
552	{normal_i2c, normal_i2c_range, \
553	probe, probe_range, \
554	ignore, ignore_range, \
555	force}
556
557	/* Detect whether we are on the isa bus. If this returns true, all i2c
558	access will fail! */
559	#define i2c_is_isa_client(clientptr) \
560	((clientptr)->adapter->algo->id == I2C_ALGO_ISA)
561	#define i2c_is_isa_adapter(adapptr) \
562	((adapptr)->algo->id == I2C_ALGO_ISA)
563
564	#endif /* _LINUX_I2C_H */

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