]>
Commit | Line | Data |
---|---|---|
1f045217 WD |
1 | /* |
2 | * (C) Copyright 2001 | |
3 | * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com. | |
4 | * | |
5 | * See file CREDITS for list of people who contributed to this | |
6 | * project. | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License as | |
10 | * published by the Free Software Foundation; either version 2 of | |
11 | * the License, or (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., 59 Temple Place, Suite 330, Boston, | |
21 | * MA 02111-1307 USA | |
22 | * | |
23 | * The original I2C interface was | |
24 | * (C) 2000 by Paolo Scaffardi (arsenio@tin.it) | |
25 | * AIRVENT SAM s.p.a - RIMINI(ITALY) | |
26 | * but has been changed substantially. | |
27 | */ | |
28 | ||
29 | #ifndef _I2C_H_ | |
30 | #define _I2C_H_ | |
31 | ||
32 | /* | |
33 | * WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING | |
34 | * | |
35 | * The implementation MUST NOT use static or global variables if the | |
36 | * I2C routines are used to read SDRAM configuration information | |
37 | * because this is done before the memories are initialized. Limited | |
38 | * use of stack-based variables are OK (the initial stack size is | |
39 | * limited). | |
40 | * | |
41 | * WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING | |
42 | */ | |
43 | ||
44 | /* | |
45 | * Configuration items. | |
46 | */ | |
47 | #define I2C_RXTX_LEN 128 /* maximum tx/rx buffer length */ | |
48 | ||
49 | /* | |
50 | * Initialization, must be called once on start up, may be called | |
51 | * repeatedly to change the speed and slave addresses. | |
52 | */ | |
53 | void i2c_init(int speed, int slaveaddr); | |
54 | ||
55 | /* | |
56 | * Probe the given I2C chip address. Returns 0 if a chip responded, | |
57 | * not 0 on failure. | |
58 | */ | |
59 | int i2c_probe(uchar chip); | |
60 | ||
61 | /* | |
62 | * Read/Write interface: | |
63 | * chip: I2C chip address, range 0..127 | |
64 | * addr: Memory (register) address within the chip | |
65 | * alen: Number of bytes to use for addr (typically 1, 2 for larger | |
66 | * memories, 0 for register type devices with only one | |
67 | * register) | |
68 | * buffer: Where to read/write the data | |
69 | * len: How many bytes to read/write | |
70 | * | |
71 | * Returns: 0 on success, not 0 on failure | |
72 | */ | |
73 | int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len); | |
74 | int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len); | |
75 | ||
76 | /* | |
77 | * Utility routines to read/write registers. | |
78 | */ | |
79 | uchar i2c_reg_read (uchar chip, uchar reg); | |
80 | void i2c_reg_write(uchar chip, uchar reg, uchar val); | |
81 | ||
82 | #endif /* _I2C_H_ */ |