s3v_i2c.c revision 1d54945d 
1/* $XFree86: xc/programs/Xserver/hw/xfree86/drivers/s3virge/s3v_i2c.c,v 1.4 2000/03/31 20:13:32 dawes Exp $ */
2
3/*
4Copyright (C) 1994-2000 The XFree86 Project, Inc.  All Rights Reserved.
5
6Permission is hereby granted, free of charge, to any person obtaining a copy of
7this software and associated documentation files (the "Software"), to deal in
8the Software without restriction, including without limitation the rights to
9use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
10of the Software, and to permit persons to whom the Software is furnished to do
11so, subject to the following conditions:
12
13The above copyright notice and this permission notice shall be included in all
14copies or substantial portions of the Software.
15
16THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FIT-
18NESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
19XFREE86 PROJECT BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
20AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
21WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
22
23Except as contained in this notice, the name of the XFree86 Project shall not
24be used in advertising or otherwise to promote the sale, use or other dealings
25in this Software without prior written authorization from the XFree86 Project.
26*/
27
28/*
29Copyright (C) 1994-2000 The XFree86 Project, Inc.  All Rights Reserved.
30
31Permission is hereby granted, free of charge, to any person obtaining a copy of
32this software and associated documentation files (the "Software"), to deal in
33the Software without restriction, including without limitation the rights to
34use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
35of the Software, and to permit persons to whom the Software is furnished to do
36so, subject to the following conditions:
37
38The above copyright notice and this permission notice shall be included in all
39copies or substantial portions of the Software.
40
41THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
42IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FIT-
43NESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
44XFREE86 PROJECT BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
45AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
46WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
47
48Except as contained in this notice, the name of the XFree86 Project shall not
49be used in advertising or otherwise to promote the sale, use or other dealings
50in this Software without prior written authorization from the XFree86 Project.
51*/
52
53#ifdef HAVE_CONFIG_H
54#include "config.h"
55#endif
56
57#include "xf86.h"
58#include "xf86_OSproc.h"
59#include "compiler.h"
60
61#include "xf86Pci.h"
62#include "xf86PciInfo.h"
63
64#include "vgaHW.h"
65
66#include "s3v.h"
67
68static void
69s3v_I2CPutBits(I2CBusPtr b, int clock,  int data)
70{
71    S3VPtr ps3v = S3VPTR(xf86Screens[b->scrnIndex]);
72    unsigned int reg = 0x10;
73
74    if(clock) reg |= 0x1;
75    if(data)  reg |= 0x2;
76
77    OUTREG(DDC_REG,reg);
78    /*ErrorF("s3v_I2CPutBits: %d %d\n", clock, data); */
79}
80
81static void
82s3v_I2CGetBits(I2CBusPtr b, int *clock, int *data)
83{
84    S3VPtr ps3v = S3VPTR(xf86Screens[b->scrnIndex]);
85    unsigned int reg;
86
87    reg = (INREG(DDC_REG));
88
89    *clock = reg & 0x4;
90    *data = reg & 0x8;
91
92    /*ErrorF("s3v_I2CGetBits: %d %d\n", *clock, *data);*/
93}
94
95Bool
96S3V_I2CInit(ScrnInfoPtr pScrn)
97{
98    S3VPtr ps3v = S3VPTR(pScrn);
99    I2CBusPtr I2CPtr;
100
101
102    I2CPtr = xf86CreateI2CBusRec();
103    if(!I2CPtr) return FALSE;
104
105    ps3v->I2C = I2CPtr;
106
107    I2CPtr->BusName    = "I2C bus";
108    I2CPtr->scrnIndex  = pScrn->scrnIndex;
109    I2CPtr->I2CPutBits = s3v_I2CPutBits;
110    I2CPtr->I2CGetBits = s3v_I2CGetBits;
111
112    if (!xf86I2CBusInit(I2CPtr))
113      return FALSE;
114
115    return TRUE;
116}
117
118
119
120