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422 giacomo 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: i2c.h,v 1.1 2004-01-28 15:25:29 giacomo Exp $ */
27
 
28
#ifndef _LINUX_I2C_H
29
#define _LINUX_I2C_H
30
 
31
#include <linux/module.h>
32
#include <linux/types.h>
33
#include <linux/i2c-id.h>
34
#include <linux/device.h>       /* for struct device */
35
#include <asm/semaphore.h>
36
 
37
/* --- General options ------------------------------------------------ */
38
 
39
struct i2c_msg;
40
struct i2c_algorithm;
41
struct i2c_adapter;
42
struct i2c_client;
43
struct i2c_driver;
44
struct i2c_client_address_data;
45
union i2c_smbus_data;
46
 
47
/*
48
 * The master routines are the ones normally used to transmit data to devices
49
 * on a bus (or read from them). Apart from two basic transfer functions to
50
 * transmit one message at a time, a more complex version can be used to
51
 * transmit an arbitrary number of messages without interruption.
52
 */
53
extern int i2c_master_send(struct i2c_client *,const char* ,int);
54
extern int i2c_master_recv(struct i2c_client *,char* ,int);
55
 
56
/* Transfer num messages.
57
 */
58
extern int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg msg[],int num);
59
 
60
/*
61
 * Some adapter types (i.e. PCF 8584 based ones) may support slave behaviuor.
62
 * This is not tested/implemented yet and will change in the future.
63
 */
64
extern int i2c_slave_send(struct i2c_client *,char*,int);
65
extern int i2c_slave_recv(struct i2c_client *,char*,int);
66
 
67
 
68
 
69
/* This is the very generalized SMBus access routine. You probably do not
70
   want to use this, though; one of the functions below may be much easier,
71
   and probably just as fast.
72
   Note that we use i2c_adapter here, because you do not need a specific
73
   smbus adapter to call this function. */
74
extern s32 i2c_smbus_xfer (struct i2c_adapter * adapter, u16 addr,
75
                           unsigned short flags,
76
                           char read_write, u8 command, int size,
77
                           union i2c_smbus_data * data);
78
 
79
/* Now follow the 'nice' access routines. These also document the calling
80
   conventions of smbus_access. */
81
 
82
extern s32 i2c_smbus_write_quick(struct i2c_client * client, u8 value);
83
extern s32 i2c_smbus_read_byte(struct i2c_client * client);
84
extern s32 i2c_smbus_write_byte(struct i2c_client * client, u8 value);
85
extern s32 i2c_smbus_read_byte_data(struct i2c_client * client, u8 command);
86
extern s32 i2c_smbus_write_byte_data(struct i2c_client * client,
87
                                     u8 command, u8 value);
88
extern s32 i2c_smbus_read_word_data(struct i2c_client * client, u8 command);
89
extern s32 i2c_smbus_write_word_data(struct i2c_client * client,
90
                                     u8 command, u16 value);
91
extern s32 i2c_smbus_process_call(struct i2c_client * client,
92
                                  u8 command, u16 value);
93
/* Returns the number of read bytes */
94
extern s32 i2c_smbus_read_block_data(struct i2c_client * client,
95
                                     u8 command, u8 *values);
96
extern s32 i2c_smbus_write_block_data(struct i2c_client * client,
97
                                      u8 command, u8 length,
98
                                      u8 *values);
99
extern s32 i2c_smbus_read_i2c_block_data(struct i2c_client * client,
100
                                         u8 command, u8 *values);
101
extern s32 i2c_smbus_write_i2c_block_data(struct i2c_client * client,
102
                                          u8 command, u8 length,
103
                                          u8 *values);
104
 
105
 
106
/*
107
 * A driver is capable of handling one or more physical devices present on
108
 * I2C adapters. This information is used to inform the driver of adapter
109
 * events.
110
 */
111
 
112
struct i2c_driver {
113
        struct module *owner;
114
        char name[32];
115
        int id;
116
        unsigned int flags;             /* div., see below              */
117
 
118
        /* Notifies the driver that a new bus has appeared. This routine
119
         * can be used by the driver to test if the bus meets its conditions
120
         * & seek for the presence of the chip(s) it supports. If found, it
121
         * registers the client(s) that are on the bus to the i2c admin. via
122
         * i2c_attach_client.
123
         */
124
        int (*attach_adapter)(struct i2c_adapter *);
125
        int (*detach_adapter)(struct i2c_adapter *);
126
 
127
        /* tells the driver that a client is about to be deleted & gives it
128
         * the chance to remove its private data. Also, if the client struct
129
         * has been dynamically allocated by the driver in the function above,
130
         * it must be freed here.
131
         */
132
        int (*detach_client)(struct i2c_client *);
133
 
134
        /* a ioctl like command that can be used to perform specific functions
135
         * with the device.
136
         */
137
        int (*command)(struct i2c_client *client,unsigned int cmd, void *arg);
138
 
139
        struct device_driver driver;
140
        struct list_head list;
141
};
142
#define to_i2c_driver(d) container_of(d, struct i2c_driver, driver)
143
 
144
extern struct bus_type i2c_bus_type;
145
 
146
#define I2C_NAME_SIZE   50
147
 
148
/*
149
 * i2c_client identifies a single device (i.e. chip) that is connected to an
150
 * i2c bus. The behaviour is defined by the routines of the driver. This
151
 * function is mainly used for lookup & other admin. functions.
152
 */
153
struct i2c_client {
154
        int id;
155
        unsigned int flags;             /* div., see below              */
156
        unsigned int addr;              /* chip address - NOTE: 7bit    */
157
                                        /* addresses are stored in the  */
158
                                        /* _LOWER_ 7 bits of this char  */
159
        /* addr: unsigned int to make lm_sensors i2c-isa adapter work
160
          more cleanly. It does not take any more memory space, due to
161
          alignment considerations */
162
        struct i2c_adapter *adapter;    /* the adapter we sit on        */
163
        struct i2c_driver *driver;      /* and our access routines      */
164
        int usage_count;                /* How many accesses currently  */
165
                                        /* to the client                */
166
        struct device dev;              /* the device structure         */
167
        struct list_head list;
168
        char name[I2C_NAME_SIZE];
169
        struct completion released;
170
};
171
#define to_i2c_client(d) container_of(d, struct i2c_client, dev)
172
 
173
static inline void *i2c_get_clientdata (struct i2c_client *dev)
174
{
175
        return dev_get_drvdata (&dev->dev);
176
}
177
 
178
static inline void i2c_set_clientdata (struct i2c_client *dev, void *data)
179
{
180
        dev_set_drvdata (&dev->dev, data);
181
}
182
 
183
#define I2C_DEVNAME(str)        .name = str
184
 
185
static inline char *i2c_clientname(struct i2c_client *c)
186
{
187
        return &c->name[0];
188
}
189
 
190
/*
191
 * The following structs are for those who like to implement new bus drivers:
192
 * i2c_algorithm is the interface to a class of hardware solutions which can
193
 * be addressed using the same bus algorithms - i.e. bit-banging or the PCF8584
194
 * to name two of the most common.
195
 */
196
struct i2c_algorithm {
197
        char name[32];                          /* textual description  */
198
        unsigned int id;
199
 
200
        /* If an adapter algorithm can't to I2C-level access, set master_xfer
201
           to NULL. If an adapter algorithm can do SMBus access, set
202
           smbus_xfer. If set to NULL, the SMBus protocol is simulated
203
           using common I2C messages */
204
        int (*master_xfer)(struct i2c_adapter *adap,struct i2c_msg msgs[],
205
                           int num);
206
        int (*smbus_xfer) (struct i2c_adapter *adap, u16 addr,
207
                           unsigned short flags, char read_write,
208
                           u8 command, int size, union i2c_smbus_data * data);
209
 
210
        /* --- these optional/future use for some adapter types.*/
211
        int (*slave_send)(struct i2c_adapter *,char*,int);
212
        int (*slave_recv)(struct i2c_adapter *,char*,int);
213
 
214
        /* --- ioctl like call to set div. parameters. */
215
        int (*algo_control)(struct i2c_adapter *, unsigned int, unsigned long);
216
 
217
        /* To determine what the adapter supports */
218
        u32 (*functionality) (struct i2c_adapter *);
219
};
220
 
221
/*
222
 * i2c_adapter is the structure used to identify a physical i2c bus along
223
 * with the access algorithms necessary to access it.
224
 */
225
struct i2c_adapter {
226
        struct module *owner;
227
        unsigned int id;/* == is algo->id | hwdep.struct->id,           */
228
                        /* for registered values see below              */
229
        unsigned int class;
230
        struct i2c_algorithm *algo;/* the algorithm to access the bus   */
231
        void *algo_data;
232
 
233
        /* --- administration stuff. */
234
        int (*client_register)(struct i2c_client *);
235
        int (*client_unregister)(struct i2c_client *);
236
 
237
        /* data fields that are valid for all devices   */
238
        struct semaphore bus_lock;
239
        struct semaphore clist_lock;
240
        unsigned int flags;/* flags specifying div. data                */
241
 
242
        int timeout;
243
        int retries;
244
        struct device dev;              /* the adapter device */
245
        struct class_device class_dev;  /* the class device */
246
 
247
#ifdef CONFIG_PROC_FS 
248
        /* No need to set this when you initialize the adapter          */
249
        int inode;
250
#endif /* def CONFIG_PROC_FS */
251
 
252
        int nr;
253
        struct list_head clients;
254
        struct list_head list;
255
        char name[I2C_NAME_SIZE];
256
        struct completion dev_released;
257
        struct completion class_dev_released;
258
};
259
#define dev_to_i2c_adapter(d) container_of(d, struct i2c_adapter, dev)
260
#define class_dev_to_i2c_adapter(d) container_of(d, struct i2c_adapter, class_dev)
261
 
262
static inline void *i2c_get_adapdata (struct i2c_adapter *dev)
263
{
264
        return dev_get_drvdata (&dev->dev);
265
}
266
 
267
static inline void i2c_set_adapdata (struct i2c_adapter *dev, void *data)
268
{
269
        dev_set_drvdata (&dev->dev, data);
270
}
271
 
272
/*flags for the driver struct: */
273
#define I2C_DF_NOTIFY   0x01            /* notify on bus (de/a)ttaches  */
274
#if 0
275
/* this flag is gone -- there is a (optional) driver->detach_adapter
276
 * callback now which can be used instead */
277
# define I2C_DF_DUMMY   0x02
278
#endif
279
 
280
/*flags for the client struct: */
281
#define I2C_CLIENT_ALLOW_USE            0x01    /* Client allows access */
282
#define I2C_CLIENT_ALLOW_MULTIPLE_USE   0x02    /* Allow multiple access-locks */
283
                                                /* on an i2c_client */
284
#define I2C_CLIENT_PEC  0x04                    /* Use Packet Error Checking */
285
#define I2C_CLIENT_TEN  0x10                    /* we have a ten bit chip address       */
286
                                                /* Must equal I2C_M_TEN below */
287
 
288
/* i2c adapter classes (bitmask) */
289
#define I2C_ADAP_CLASS_SMBUS            (1<<0)  /* lm_sensors, ... */
290
#define I2C_ADAP_CLASS_TV_ANALOG        (1<<1)  /* bttv + friends */
291
#define I2C_ADAP_CLASS_TV_DIGITAL       (1<<2)  /* dbv cards */
292
#define I2C_ADAP_CLASS_DDC              (1<<3)  /* i2c-matroxfb ? */
293
#define I2C_ADAP_CLASS_CAM_ANALOG       (1<<4)  /* camera with analog CCD */
294
#define I2C_ADAP_CLASS_CAM_DIGITAL      (1<<5)  /* most webcams */
295
 
296
/* i2c_client_address_data is the struct for holding default client
297
 * addresses for a driver and for the parameters supplied on the
298
 * command line
299
 */
300
struct i2c_client_address_data {
301
        unsigned short *normal_i2c;
302
        unsigned short *normal_i2c_range;
303
        unsigned short *probe;
304
        unsigned short *probe_range;
305
        unsigned short *ignore;
306
        unsigned short *ignore_range;
307
        unsigned short *force;
308
};
309
 
310
/* Internal numbers to terminate lists */
311
#define I2C_CLIENT_END          0xfffe
312
#define I2C_CLIENT_ISA_END      0xfffefffe
313
 
314
/* The numbers to use to set I2C bus address */
315
#define ANY_I2C_BUS             0xffff
316
#define ANY_I2C_ISA_BUS         9191
317
 
318
/* The length of the option lists */
319
#define I2C_CLIENT_MAX_OPTS 48
320
 
321
 
322
/* ----- functions exported by i2c.o */
323
 
324
/* administration...
325
 */
326
extern int i2c_add_adapter(struct i2c_adapter *);
327
extern int i2c_del_adapter(struct i2c_adapter *);
328
 
329
extern int i2c_add_driver(struct i2c_driver *);
330
extern int i2c_del_driver(struct i2c_driver *);
331
 
332
extern int i2c_attach_client(struct i2c_client *);
333
extern int i2c_detach_client(struct i2c_client *);
334
 
335
/* New function: This is to get an i2c_client-struct for controlling the
336
   client either by using i2c_control-function or having the
337
   client-module export functions that can be used with the i2c_client
338
   -struct. */
339
extern struct i2c_client *i2c_get_client(int driver_id, int adapter_id,
340
                                        struct i2c_client *prev);
341
 
342
/* Should be used with new function
343
   extern struct i2c_client *i2c_get_client(int,int,struct i2c_client *);
344
   to make sure that client-struct is valid and that it is okay to access
345
   the i2c-client.
346
   returns -EACCES if client doesn't allow use (default)
347
   returns -EBUSY if client doesn't allow multiple use (default) and
348
   usage_count >0 */
349
extern int i2c_use_client(struct i2c_client *);
350
extern int i2c_release_client(struct i2c_client *);
351
 
352
/* call the i2c_client->command() of all attached clients with
353
 * the given arguments */
354
extern void i2c_clients_command(struct i2c_adapter *adap,
355
                                unsigned int cmd, void *arg);
356
 
357
/* returns -EBUSY if address has been taken, 0 if not. Note that the only
358
   other place at which this is called is within i2c_attach_client; so
359
   you can cheat by simply not registering. Not recommended, of course! */
360
extern int i2c_check_addr (struct i2c_adapter *adapter, int addr);
361
 
362
/* Detect function. It iterates over all possible addresses itself.
363
 * It will only call found_proc if some client is connected at the
364
 * specific address (unless a 'force' matched);
365
 */
366
extern int i2c_probe(struct i2c_adapter *adapter,
367
                struct i2c_client_address_data *address_data,
368
                int (*found_proc) (struct i2c_adapter *, int, int));
369
 
370
/* An ioctl like call to set div. parameters of the adapter.
371
 */
372
extern int i2c_control(struct i2c_client *,unsigned int, unsigned long);
373
 
374
/* This call returns a unique low identifier for each registered adapter,
375
 * or -1 if the adapter was not registered.
376
 */
377
extern int i2c_adapter_id(struct i2c_adapter *adap);
378
extern struct i2c_adapter* i2c_get_adapter(int id);
379
extern void i2c_put_adapter(struct i2c_adapter *adap);
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
/*
389
 * I2C Message - used for pure i2c transaction, also from /dev interface
390
 */
391
struct i2c_msg {
392
        __u16 addr;     /* slave address                        */
393
        __u16 flags;           
394
#define I2C_M_TEN       0x10    /* we have a ten bit chip address       */
395
#define I2C_M_RD        0x01
396
#define I2C_M_NOSTART   0x4000
397
#define I2C_M_REV_DIR_ADDR      0x2000
398
#define I2C_M_IGNORE_NAK        0x1000
399
#define I2C_M_NO_RD_ACK         0x0800
400
        __u16 len;              /* msg length                           */
401
        __u8 *buf;              /* pointer to msg data                  */
402
};
403
 
404
/* To determine what functionality is present */
405
 
406
#define I2C_FUNC_I2C                    0x00000001
407
#define I2C_FUNC_10BIT_ADDR             0x00000002
408
#define I2C_FUNC_PROTOCOL_MANGLING      0x00000004 /* I2C_M_{REV_DIR_ADDR,NOSTART,..} */
409
#define I2C_FUNC_SMBUS_HWPEC_CALC       0x00000008 /* SMBus 2.0 */
410
#define I2C_FUNC_SMBUS_READ_WORD_DATA_PEC  0x00000800 /* SMBus 2.0 */ 
411
#define I2C_FUNC_SMBUS_WRITE_WORD_DATA_PEC 0x00001000 /* SMBus 2.0 */ 
412
#define I2C_FUNC_SMBUS_PROC_CALL_PEC    0x00002000 /* SMBus 2.0 */
413
#define I2C_FUNC_SMBUS_BLOCK_PROC_CALL_PEC 0x00004000 /* SMBus 2.0 */
414
#define I2C_FUNC_SMBUS_BLOCK_PROC_CALL  0x00008000 /* SMBus 2.0 */
415
#define I2C_FUNC_SMBUS_QUICK            0x00010000 
416
#define I2C_FUNC_SMBUS_READ_BYTE        0x00020000 
417
#define I2C_FUNC_SMBUS_WRITE_BYTE       0x00040000 
418
#define I2C_FUNC_SMBUS_READ_BYTE_DATA   0x00080000 
419
#define I2C_FUNC_SMBUS_WRITE_BYTE_DATA  0x00100000 
420
#define I2C_FUNC_SMBUS_READ_WORD_DATA   0x00200000 
421
#define I2C_FUNC_SMBUS_WRITE_WORD_DATA  0x00400000 
422
#define I2C_FUNC_SMBUS_PROC_CALL        0x00800000 
423
#define I2C_FUNC_SMBUS_READ_BLOCK_DATA  0x01000000 
424
#define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA 0x02000000 
425
#define I2C_FUNC_SMBUS_READ_I2C_BLOCK   0x04000000 /* I2C-like block xfer  */
426
#define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK  0x08000000 /* w/ 1-byte reg. addr. */
427
#define I2C_FUNC_SMBUS_READ_I2C_BLOCK_2  0x10000000 /* I2C-like block xfer  */
428
#define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK_2 0x20000000 /* w/ 2-byte reg. addr. */
429
#define I2C_FUNC_SMBUS_READ_BLOCK_DATA_PEC  0x40000000 /* SMBus 2.0 */
430
#define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA_PEC 0x80000000 /* SMBus 2.0 */
431
 
432
#define I2C_FUNC_SMBUS_BYTE I2C_FUNC_SMBUS_READ_BYTE | \
433
                            I2C_FUNC_SMBUS_WRITE_BYTE
434
#define I2C_FUNC_SMBUS_BYTE_DATA I2C_FUNC_SMBUS_READ_BYTE_DATA | \
435
                                 I2C_FUNC_SMBUS_WRITE_BYTE_DATA
436
#define I2C_FUNC_SMBUS_WORD_DATA I2C_FUNC_SMBUS_READ_WORD_DATA | \
437
                                 I2C_FUNC_SMBUS_WRITE_WORD_DATA
438
#define I2C_FUNC_SMBUS_BLOCK_DATA I2C_FUNC_SMBUS_READ_BLOCK_DATA | \
439
                                  I2C_FUNC_SMBUS_WRITE_BLOCK_DATA
440
#define I2C_FUNC_SMBUS_I2C_BLOCK I2C_FUNC_SMBUS_READ_I2C_BLOCK | \
441
                                  I2C_FUNC_SMBUS_WRITE_I2C_BLOCK
442
#define I2C_FUNC_SMBUS_I2C_BLOCK_2 I2C_FUNC_SMBUS_READ_I2C_BLOCK_2 | \
443
                                   I2C_FUNC_SMBUS_WRITE_I2C_BLOCK_2
444
#define I2C_FUNC_SMBUS_BLOCK_DATA_PEC I2C_FUNC_SMBUS_READ_BLOCK_DATA_PEC | \
445
                                      I2C_FUNC_SMBUS_WRITE_BLOCK_DATA_PEC
446
#define I2C_FUNC_SMBUS_WORD_DATA_PEC  I2C_FUNC_SMBUS_READ_WORD_DATA_PEC | \
447
                                      I2C_FUNC_SMBUS_WRITE_WORD_DATA_PEC
448
 
449
#define I2C_FUNC_SMBUS_READ_BYTE_PEC            I2C_FUNC_SMBUS_READ_BYTE_DATA
450
#define I2C_FUNC_SMBUS_WRITE_BYTE_PEC           I2C_FUNC_SMBUS_WRITE_BYTE_DATA
451
#define I2C_FUNC_SMBUS_READ_BYTE_DATA_PEC       I2C_FUNC_SMBUS_READ_WORD_DATA
452
#define I2C_FUNC_SMBUS_WRITE_BYTE_DATA_PEC      I2C_FUNC_SMBUS_WRITE_WORD_DATA
453
#define I2C_FUNC_SMBUS_BYTE_PEC                 I2C_FUNC_SMBUS_BYTE_DATA
454
#define I2C_FUNC_SMBUS_BYTE_DATA_PEC            I2C_FUNC_SMBUS_WORD_DATA
455
 
456
#define I2C_FUNC_SMBUS_EMUL I2C_FUNC_SMBUS_QUICK | \
457
                            I2C_FUNC_SMBUS_BYTE | \
458
                            I2C_FUNC_SMBUS_BYTE_DATA | \
459
                            I2C_FUNC_SMBUS_WORD_DATA | \
460
                            I2C_FUNC_SMBUS_PROC_CALL | \
461
                            I2C_FUNC_SMBUS_WRITE_BLOCK_DATA | \
462
                            I2C_FUNC_SMBUS_WRITE_BLOCK_DATA_PEC | \
463
                            I2C_FUNC_SMBUS_I2C_BLOCK
464
 
465
/*
466
 * Data for SMBus Messages
467
 */
468
#define I2C_SMBUS_BLOCK_MAX     32      /* As specified in SMBus standard */    
469
#define I2C_SMBUS_I2C_BLOCK_MAX 32      /* Not specified but we use same structure */
470
union i2c_smbus_data {
471
        __u8 byte;
472
        __u16 word;
473
        __u8 block[I2C_SMBUS_BLOCK_MAX + 3]; /* block[0] is used for length */
474
                          /* one more for read length in block process call */
475
                                                    /* and one more for PEC */
476
};
477
 
478
/* smbus_access read or write markers */
479
#define I2C_SMBUS_READ  1
480
#define I2C_SMBUS_WRITE 0
481
 
482
/* SMBus transaction types (size parameter in the above functions)
483
   Note: these no longer correspond to the (arbitrary) PIIX4 internal codes! */
484
#define I2C_SMBUS_QUICK             0
485
#define I2C_SMBUS_BYTE              1
486
#define I2C_SMBUS_BYTE_DATA         2 
487
#define I2C_SMBUS_WORD_DATA         3
488
#define I2C_SMBUS_PROC_CALL         4
489
#define I2C_SMBUS_BLOCK_DATA        5
490
#define I2C_SMBUS_I2C_BLOCK_DATA    6
491
#define I2C_SMBUS_BLOCK_PROC_CALL   7           /* SMBus 2.0 */
492
#define I2C_SMBUS_BLOCK_DATA_PEC    8           /* SMBus 2.0 */
493
#define I2C_SMBUS_PROC_CALL_PEC     9           /* SMBus 2.0 */
494
#define I2C_SMBUS_BLOCK_PROC_CALL_PEC  10       /* SMBus 2.0 */
495
#define I2C_SMBUS_WORD_DATA_PEC    11           /* SMBus 2.0 */
496
 
497
 
498
/* ----- commands for the ioctl like i2c_command call:
499
 * note that additional calls are defined in the algorithm and hw
500
 *      dependent layers - these can be listed here, or see the
501
 *      corresponding header files.
502
 */
503
                                /* -> bit-adapter specific ioctls       */
504
#define I2C_RETRIES     0x0701  /* number of times a device address      */
505
                                /* should be polled when not            */
506
                                /* acknowledging                        */
507
#define I2C_TIMEOUT     0x0702  /* set timeout - call with int          */
508
 
509
 
510
/* this is for i2c-dev.c        */
511
#define I2C_SLAVE       0x0703  /* Change slave address                 */
512
                                /* Attn.: Slave address is 7 or 10 bits */
513
#define I2C_SLAVE_FORCE 0x0706  /* Change slave address                 */
514
                                /* Attn.: Slave address is 7 or 10 bits */
515
                                /* This changes the address, even if it */
516
                                /* is already taken!                    */
517
#define I2C_TENBIT      0x0704  /* 0 for 7 bit addrs, != 0 for 10 bit   */
518
 
519
#define I2C_FUNCS       0x0705  /* Get the adapter functionality */
520
#define I2C_RDWR        0x0707  /* Combined R/W transfer (one stop only)*/
521
#define I2C_PEC         0x0708  /* != 0 for SMBus PEC                   */
522
#if 0
523
#define I2C_ACK_TEST    0x0710  /* See if a slave is at a specific address */
524
#endif
525
 
526
#define I2C_SMBUS       0x0720  /* SMBus-level access */
527
 
528
/* ... algo-bit.c recognizes */
529
#define I2C_UDELAY      0x0705  /* set delay in microsecs between each  */
530
                                /* written byte (except address)        */
531
#define I2C_MDELAY      0x0706  /* millisec delay between written bytes */
532
 
533
/* ----- I2C-DEV: char device interface stuff ------------------------- */
534
 
535
#define I2C_MAJOR       89              /* Device major number          */
536
 
537
/* These defines are used for probing i2c client addresses */
538
/* Default fill of many variables */
539
#define I2C_CLIENT_DEFAULTS {I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
540
                          I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
541
                          I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
542
                          I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
543
                          I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
544
                          I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
545
                          I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
546
                          I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
547
                          I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
548
                          I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
549
                          I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
550
                          I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
551
                          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
 
556
/* This is ugly. We need to evaluate I2C_CLIENT_MAX_OPTS before it is
557
   stringified */
558
#define I2C_CLIENT_MODPARM_AUX1(x) "1-" #x "h"
559
#define I2C_CLIENT_MODPARM_AUX(x) I2C_CLIENT_MODPARM_AUX1(x)
560
#define I2C_CLIENT_MODPARM I2C_CLIENT_MODPARM_AUX(I2C_CLIENT_MAX_OPTS)
561
 
562
/* I2C_CLIENT_MODULE_PARM creates a module parameter, and puts it in the
563
   module header */
564
 
565
#define I2C_CLIENT_MODULE_PARM(var,desc) \
566
  static unsigned short var[I2C_CLIENT_MAX_OPTS] = I2C_CLIENT_DEFAULTS; \
567
  MODULE_PARM(var,I2C_CLIENT_MODPARM); \
568
  MODULE_PARM_DESC(var,desc)
569
 
570
/* This is the one you want to use in your own modules */
571
#define I2C_CLIENT_INSMOD \
572
  I2C_CLIENT_MODULE_PARM(probe, \
573
                      "List of adapter,address pairs to scan additionally"); \
574
  I2C_CLIENT_MODULE_PARM(probe_range, \
575
                      "List of adapter,start-addr,end-addr triples to scan " \
576
                      "additionally"); \
577
  I2C_CLIENT_MODULE_PARM(ignore, \
578
                      "List of adapter,address pairs not to scan"); \
579
  I2C_CLIENT_MODULE_PARM(ignore_range, \
580
                      "List of adapter,start-addr,end-addr triples not to " \
581
                      "scan"); \
582
  I2C_CLIENT_MODULE_PARM(force, \
583
                      "List of adapter,address pairs to boldly assume " \
584
                      "to be present"); \
585
        static struct i2c_client_address_data addr_data = {             \
586
                        .normal_i2c =           normal_i2c,             \
587
                        .normal_i2c_range =     normal_i2c_range,       \
588
                        .probe =                probe,                  \
589
                        .probe_range =          probe_range,            \
590
                        .ignore =               ignore,                 \
591
                        .ignore_range =         ignore_range,           \
592
                        .force =                force,                  \
593
                }
594
 
595
/* Detect whether we are on the isa bus. If this returns true, all i2c
596
   access will fail! */
597
#define i2c_is_isa_client(clientptr) \
598
        ((clientptr)->adapter->algo->id == I2C_ALGO_ISA)
599
#define i2c_is_isa_adapter(adapptr) \
600
        ((adapptr)->algo->id == I2C_ALGO_ISA)
601
 
602
/* Tiny delay function used by the i2c bus drivers */
603
static inline void i2c_delay(signed long timeout)
604
{
605
        set_current_state(TASK_INTERRUPTIBLE);
606
        schedule_timeout(timeout);
607
}
608
 
609
#endif /* _LINUX_I2C_H */