summaryrefslogtreecommitdiff
path: root/recipes/i2c/files/i2c-dev.h
blob: cd20965edef79f478125e8dae39814e351461ad2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
/*
    i2c-dev.h - i2c-bus driver, char device interface

    Copyright (C) 1995-97 Simon G. Vogl
    Copyright (C) 1998-99 Frodo Looijaard <frodol@dds.nl>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

/* $Id: i2c-dev.h,v 1.4 2003/11/27 23:08:06 tat Exp $ */

#ifndef LIB_I2CDEV_H
#define LIB_I2CDEV_H

#include <linux/types.h>
#include <sys/ioctl.h>


/* -- i2c.h -- */


/*
 * I2C Message - used for pure i2c transaction, also from /dev interface
 */
struct i2c_msg {
        __u16 addr;     /* slave address                        */
        unsigned short flags;           
#define I2C_M_TEN       0x10    /* we have a ten bit chip address       */
#define I2C_M_RD        0x01
#define I2C_M_NOSTART   0x4000
#define I2C_M_REV_DIR_ADDR      0x2000
#define I2C_M_IGNORE_NAK        0x1000
#define I2C_M_NO_RD_ACK         0x0800
        short len;              /* msg length                           */
        char *buf;              /* pointer to msg data                  */
};

/* To determine what functionality is present */

#define I2C_FUNC_I2C                    0x00000001
#define I2C_FUNC_10BIT_ADDR             0x00000002
#define I2C_FUNC_PROTOCOL_MANGLING      0x00000004 /* I2C_M_{REV_DIR_ADDR,NOSTART,..} */
#define I2C_FUNC_SMBUS_HWPEC_CALC       0x00000008 /* SMBus 2.0 */
#define I2C_FUNC_SMBUS_READ_WORD_DATA_PEC  0x00000800 /* SMBus 2.0 */ 
#define I2C_FUNC_SMBUS_WRITE_WORD_DATA_PEC 0x00001000 /* SMBus 2.0 */ 
#define I2C_FUNC_SMBUS_PROC_CALL_PEC    0x00002000 /* SMBus 2.0 */
#define I2C_FUNC_SMBUS_BLOCK_PROC_CALL_PEC 0x00004000 /* SMBus 2.0 */
#define I2C_FUNC_SMBUS_BLOCK_PROC_CALL  0x00008000 /* SMBus 2.0 */
#define I2C_FUNC_SMBUS_QUICK            0x00010000 
#define I2C_FUNC_SMBUS_READ_BYTE        0x00020000 
#define I2C_FUNC_SMBUS_WRITE_BYTE       0x00040000 
#define I2C_FUNC_SMBUS_READ_BYTE_DATA   0x00080000 
#define I2C_FUNC_SMBUS_WRITE_BYTE_DATA  0x00100000 
#define I2C_FUNC_SMBUS_READ_WORD_DATA   0x00200000 
#define I2C_FUNC_SMBUS_WRITE_WORD_DATA  0x00400000 
#define I2C_FUNC_SMBUS_PROC_CALL        0x00800000 
#define I2C_FUNC_SMBUS_READ_BLOCK_DATA  0x01000000 
#define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA 0x02000000 
#define I2C_FUNC_SMBUS_READ_I2C_BLOCK   0x04000000 /* I2C-like block xfer  */
#define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK  0x08000000 /* w/ 1-byte reg. addr. */
#define I2C_FUNC_SMBUS_READ_I2C_BLOCK_2  0x10000000 /* I2C-like block xfer  */
#define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK_2 0x20000000 /* w/ 2-byte reg. addr. */
#define I2C_FUNC_SMBUS_READ_BLOCK_DATA_PEC  0x40000000 /* SMBus 2.0 */
#define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA_PEC 0x80000000 /* SMBus 2.0 */

#define I2C_FUNC_SMBUS_BYTE I2C_FUNC_SMBUS_READ_BYTE | \
                            I2C_FUNC_SMBUS_WRITE_BYTE
#define I2C_FUNC_SMBUS_BYTE_DATA I2C_FUNC_SMBUS_READ_BYTE_DATA | \
                                 I2C_FUNC_SMBUS_WRITE_BYTE_DATA
#define I2C_FUNC_SMBUS_WORD_DATA I2C_FUNC_SMBUS_READ_WORD_DATA | \
                                 I2C_FUNC_SMBUS_WRITE_WORD_DATA
#define I2C_FUNC_SMBUS_BLOCK_DATA I2C_FUNC_SMBUS_READ_BLOCK_DATA | \
                                  I2C_FUNC_SMBUS_WRITE_BLOCK_DATA
#define I2C_FUNC_SMBUS_I2C_BLOCK I2C_FUNC_SMBUS_READ_I2C_BLOCK | \
                                  I2C_FUNC_SMBUS_WRITE_I2C_BLOCK
#define I2C_FUNC_SMBUS_I2C_BLOCK_2 I2C_FUNC_SMBUS_READ_I2C_BLOCK_2 | \
                                   I2C_FUNC_SMBUS_WRITE_I2C_BLOCK_2
#define I2C_FUNC_SMBUS_BLOCK_DATA_PEC I2C_FUNC_SMBUS_READ_BLOCK_DATA_PEC | \
                                      I2C_FUNC_SMBUS_WRITE_BLOCK_DATA_PEC
#define I2C_FUNC_SMBUS_WORD_DATA_PEC  I2C_FUNC_SMBUS_READ_WORD_DATA_PEC | \
                                      I2C_FUNC_SMBUS_WRITE_WORD_DATA_PEC

#define I2C_FUNC_SMBUS_READ_BYTE_PEC            I2C_FUNC_SMBUS_READ_BYTE_DATA
#define I2C_FUNC_SMBUS_WRITE_BYTE_PEC           I2C_FUNC_SMBUS_WRITE_BYTE_DATA
#define I2C_FUNC_SMBUS_READ_BYTE_DATA_PEC       I2C_FUNC_SMBUS_READ_WORD_DATA
#define I2C_FUNC_SMBUS_WRITE_BYTE_DATA_PEC      I2C_FUNC_SMBUS_WRITE_WORD_DATA
#define I2C_FUNC_SMBUS_BYTE_PEC                 I2C_FUNC_SMBUS_BYTE_DATA
#define I2C_FUNC_SMBUS_BYTE_DATA_PEC            I2C_FUNC_SMBUS_WORD_DATA

#define I2C_FUNC_SMBUS_EMUL I2C_FUNC_SMBUS_QUICK | \
                            I2C_FUNC_SMBUS_BYTE | \
                            I2C_FUNC_SMBUS_BYTE_DATA | \
                            I2C_FUNC_SMBUS_WORD_DATA | \
                            I2C_FUNC_SMBUS_PROC_CALL | \
                            I2C_FUNC_SMBUS_WRITE_BLOCK_DATA | \
                            I2C_FUNC_SMBUS_WRITE_BLOCK_DATA_PEC | \
                            I2C_FUNC_SMBUS_I2C_BLOCK

/* 
 * Data for SMBus Messages 
 */
#define I2C_SMBUS_BLOCK_MAX     32      /* As specified in SMBus standard */    
#define I2C_SMBUS_I2C_BLOCK_MAX 32      /* Not specified but we use same structure */
union i2c_smbus_data {
        __u8 byte;
        __u16 word;
        __u8 block[I2C_SMBUS_BLOCK_MAX + 3]; /* block[0] is used for length */
                          /* one more for read length in block process call */
                                                    /* and one more for PEC */
};

/* smbus_access read or write markers */
#define I2C_SMBUS_READ  1
#define I2C_SMBUS_WRITE 0

/* SMBus transaction types (size parameter in the above functions) 
   Note: these no longer correspond to the (arbitrary) PIIX4 internal codes! */
#define I2C_SMBUS_QUICK             0
#define I2C_SMBUS_BYTE              1
#define I2C_SMBUS_BYTE_DATA         2 
#define I2C_SMBUS_WORD_DATA         3
#define I2C_SMBUS_PROC_CALL         4
#define I2C_SMBUS_BLOCK_DATA        5
#define I2C_SMBUS_I2C_BLOCK_DATA    6
#define I2C_SMBUS_BLOCK_PROC_CALL   7           /* SMBus 2.0 */
#define I2C_SMBUS_BLOCK_DATA_PEC    8           /* SMBus 2.0 */
#define I2C_SMBUS_PROC_CALL_PEC     9           /* SMBus 2.0 */
#define I2C_SMBUS_BLOCK_PROC_CALL_PEC  10       /* SMBus 2.0 */
#define I2C_SMBUS_WORD_DATA_PEC    11           /* SMBus 2.0 */


/* ----- commands for the ioctl like i2c_command call:
 * note that additional calls are defined in the algorithm and hw 
 *      dependent layers - these can be listed here, or see the 
 *      corresponding header files.
 */
                                /* -> bit-adapter specific ioctls       */
#define I2C_RETRIES     0x0701  /* number of times a device address      */
                                /* should be polled when not            */
                                /* acknowledging                        */
#define I2C_TIMEOUT     0x0702  /* set timeout - call with int          */


/* this is for i2c-dev.c        */
#define I2C_SLAVE       0x0703  /* Change slave address                 */
                                /* Attn.: Slave address is 7 or 10 bits */
#define I2C_SLAVE_FORCE 0x0706  /* Change slave address                 */
                                /* Attn.: Slave address is 7 or 10 bits */
                                /* This changes the address, even if it */
                                /* is already taken!                    */
#define I2C_TENBIT      0x0704  /* 0 for 7 bit addrs, != 0 for 10 bit   */

#define I2C_FUNCS       0x0705  /* Get the adapter functionality */
#define I2C_RDWR        0x0707  /* Combined R/W transfer (one stop only)*/
#define I2C_PEC         0x0708  /* != 0 for SMBus PEC                   */
#if 0
#define I2C_ACK_TEST    0x0710  /* See if a slave is at a specific address */
#endif

#define I2C_SMBUS       0x0720  /* SMBus-level access */

/* -- i2c.h -- */


/* Note: 10-bit addresses are NOT supported! */

/* This is the structure as used in the I2C_SMBUS ioctl call */
struct i2c_smbus_ioctl_data {
        char read_write;
        __u8 command;
        int size;
        union i2c_smbus_data *data;
};

/* This is the structure as used in the I2C_RDWR ioctl call */
struct i2c_rdwr_ioctl_data {
        struct i2c_msg *msgs;   /* pointers to i2c_msgs */
        int nmsgs;              /* number of i2c_msgs */
};


static inline __s32 i2c_smbus_access(int file, char read_write, __u8 command, 
                                     int size, union i2c_smbus_data *data)
{
        struct i2c_smbus_ioctl_data args;
    int rc;

        args.read_write = read_write;
        args.command = command;
        args.size = size;
        args.data = data;

        rc = ioctl(file,I2C_SMBUS,&args);

    return rc;
}


static inline __s32 i2c_smbus_write_quick(int file, __u8 value)
{
        return i2c_smbus_access(file,value,0,I2C_SMBUS_QUICK,NULL);
}
        
static inline __s32 i2c_smbus_read_byte(int file)
{
        union i2c_smbus_data data;
        if (i2c_smbus_access(file,I2C_SMBUS_READ,0,I2C_SMBUS_BYTE,&data))
                return -1;
        else
                return 0x0FF & data.byte;
}

static inline __s32 i2c_smbus_write_byte(int file, __u8 value)
{
        return i2c_smbus_access(file,I2C_SMBUS_WRITE,value,
                                I2C_SMBUS_BYTE,NULL);
}

static inline __s32 i2c_smbus_read_byte_data(int file, __u8 command)
{
        union i2c_smbus_data data;
        if (i2c_smbus_access(file,I2C_SMBUS_READ,command,
                             I2C_SMBUS_BYTE_DATA,&data))
                return -1;
        else
                return 0x0FF & data.byte;
}

static inline __s32 i2c_smbus_write_byte_data(int file, __u8 command, 
                                              __u8 value)
{
        union i2c_smbus_data data;
        data.byte = value;
        return i2c_smbus_access(file,I2C_SMBUS_WRITE,command,
                                I2C_SMBUS_BYTE_DATA, &data);
}

static inline __s32 i2c_smbus_read_word_data(int file, __u8 command)
{
        union i2c_smbus_data data;
        if (i2c_smbus_access(file,I2C_SMBUS_READ,command,
                             I2C_SMBUS_WORD_DATA,&data))
                return -1;
        else
                return 0x0FFFF & data.word;
}

static inline __s32 i2c_smbus_write_word_data(int file, __u8 command, 
                                              __u16 value)
{
        union i2c_smbus_data data;
        data.word = value;
        return i2c_smbus_access(file,I2C_SMBUS_WRITE,command,
                                I2C_SMBUS_WORD_DATA, &data);
}

static inline __s32 i2c_smbus_process_call(int file, __u8 command, __u16 value)
{
        union i2c_smbus_data data;
        data.word = value;
        if (i2c_smbus_access(file,I2C_SMBUS_WRITE,command,
                             I2C_SMBUS_PROC_CALL,&data))
                return -1;
        else
                return 0x0FFFF & data.word;
}


/* Returns the number of read bytes */
static inline __s32 i2c_smbus_read_block_data(int file, __u8 command, 
                                              __u8 *values)
{
        union i2c_smbus_data data;
        int i;
        if (i2c_smbus_access(file,I2C_SMBUS_READ,command,
                             I2C_SMBUS_BLOCK_DATA,&data))
                return -1;
        else {
                for (i = 1; i <= data.block[0]; i++)
                        values[i-1] = data.block[i];
                return data.block[0];
        }
}

static inline __s32 i2c_smbus_write_block_data(int file, __u8 command, 
                                               __u8 length, __u8 *values)
{
        union i2c_smbus_data data;
        int i;
        if (length > 32)
                length = 32;
        for (i = 1; i <= length; i++)
                data.block[i] = values[i-1];
        data.block[0] = length;
        return i2c_smbus_access(file,I2C_SMBUS_WRITE,command,
                                I2C_SMBUS_BLOCK_DATA, &data);
}

/* Returns the number of read bytes */
static inline __s32 i2c_smbus_read_i2c_block_data(int file, __u8 command,
                                                  __u8 *values)
{
        union i2c_smbus_data data;
        int i;
        if (i2c_smbus_access(file,I2C_SMBUS_READ,command,
                              I2C_SMBUS_I2C_BLOCK_DATA,&data))
                return -1;
        else {
                for (i = 1; i <= data.block[0]; i++)
                        values[i-1] = data.block[i];
                return data.block[0];
        }
}

static inline __s32 i2c_smbus_write_i2c_block_data(int file, __u8 command,
                                               __u8 length, __u8 *values)
{
        union i2c_smbus_data data;
        int i;
        if (length > 32)
                length = 32;
        for (i = 1; i <= length; i++)
                data.block[i] = values[i-1];
        data.block[0] = length;
        return i2c_smbus_access(file,I2C_SMBUS_WRITE,command,
                                I2C_SMBUS_I2C_BLOCK_DATA, &data);
}

/* Returns the number of read bytes */
static inline __s32 i2c_smbus_block_process_call(int file, __u8 command,
                                                 __u8 length, __u8 *values)
{
        union i2c_smbus_data data;
        int i;
        if (length > 32)
                length = 32;
        for (i = 1; i <= length; i++)
                data.block[i] = values[i-1];
        data.block[0] = length;
    i = i2c_smbus_access(file,I2C_SMBUS_WRITE,command,
                             I2C_SMBUS_BLOCK_PROC_CALL,&data);
    if ( i )
                return -1;
        else {
                for (i = 1; i <= data.block[0]; i++)
                        values[i-1] = data.block[i];
                return data.block[0];
        }
}


#endif /* LIB_I2CDEV_H */