savage_i2c.c revision ab47cfaa 
1/* $XFree86: xc/programs/Xserver/hw/xfree86/drivers/savage/savage_i2c.c,v 1.1 2001/02/13 21:15:19 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#ifdef HAVE_CONFIG_H
29#include "config.h"
30#endif
31
32#include "xf86.h"
33#include "xf86_OSproc.h"
34#include "compiler.h"
35
36#include "xf86Pci.h"
37#include "xf86PciInfo.h"
38
39#include "vgaHW.h"
40
41#include "savage_driver.h"
42
43static void
44SavageI2CPutBits(I2CBusPtr b, int clock,  int data)
45{
46    ScrnInfoPtr pScrn = (ScrnInfoPtr)(xf86Screens[b->scrnIndex]);
47    SavagePtr psav = SAVPTR(pScrn);
48    unsigned char reg = 0x10;
49
50    if(clock) reg |= 0x1;
51    if(data)  reg |= 0x2;
52
53    OutI2CREG(reg,psav->DDCPort);
54    /*ErrorF("SavageI2CPutBits: %d %d\n", clock, data); */
55}
56
57static void
58SavageI2CGetBits(I2CBusPtr b, int *clock, int *data)
59{
60    ScrnInfoPtr pScrn = (ScrnInfoPtr)(xf86Screens[b->scrnIndex]);
61    SavagePtr psav = SAVPTR(pScrn);
62    unsigned char reg = 0x10;
63
64    InI2CREG(reg,psav->DDCPort);
65
66    *clock = reg & 0x4;
67    *data = reg & 0x8;
68
69    /*ErrorF("SavageI2CGetBits: %d %d\n", *clock, *data); */
70}
71
72Bool
73SavageI2CInit(ScrnInfoPtr pScrn)
74{
75    SavagePtr psav = SAVPTR(pScrn);
76    I2CBusPtr I2CPtr;
77
78    I2CPtr = xf86CreateI2CBusRec();
79    if(!I2CPtr) return FALSE;
80
81    psav->I2C = I2CPtr;
82
83    I2CPtr->BusName    = "I2C bus";
84    I2CPtr->scrnIndex  = pScrn->scrnIndex;
85    I2CPtr->I2CPutBits = SavageI2CPutBits;
86    I2CPtr->I2CGetBits = SavageI2CGetBits;
87
88    if (!xf86I2CBusInit(I2CPtr))
89	return FALSE;
90
91    return TRUE;
92}
93
94
95
96