savage_i2c.c revision aa9e3350 
1
2/*
3Copyright (C) 1994-2000 The XFree86 Project, Inc.  All Rights Reserved.
4
5Permission is hereby granted, free of charge, to any person obtaining a copy of
6this software and associated documentation files (the "Software"), to deal in
7the Software without restriction, including without limitation the rights to
8use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
9of the Software, and to permit persons to whom the Software is furnished to do
10so, subject to the following conditions:
11
12The above copyright notice and this permission notice shall be included in all
13copies or substantial portions of the Software.
14
15THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FIT-
17NESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
18XFREE86 PROJECT BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
19AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
20WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
21
22Except as contained in this notice, the name of the XFree86 Project shall not
23be used in advertising or otherwise to promote the sale, use or other dealings
24in this Software without prior written authorization from the XFree86 Project.
25*/
26
27#ifdef HAVE_CONFIG_H
28#include "config.h"
29#endif
30
31#include "xf86.h"
32#include "xf86_OSproc.h"
33#include "compiler.h"
34
35#include "savage_driver.h"
36
37static void
38SavageI2CPutBits(I2CBusPtr b, int clock,  int data)
39{
40#ifdef XF86_SCRN_INTERFACE
41    ScrnInfoPtr pScrn = b->pScrn;
42#else
43    ScrnInfoPtr pScrn = (ScrnInfoPtr)(xf86Screens[b->scrnIndex]);
44#endif
45    SavagePtr psav = SAVPTR(pScrn);
46    unsigned char reg = 0x10;
47
48    if(clock) reg |= 0x1;
49    if(data)  reg |= 0x2;
50
51    OutI2CREG(reg,psav->DDCPort);
52    /*ErrorF("SavageI2CPutBits: %d %d\n", clock, data); */
53}
54
55static void
56SavageI2CGetBits(I2CBusPtr b, int *clock, int *data)
57{
58#ifdef XF86_SCRN_INTERFACE
59    ScrnInfoPtr pScrn = b->pScrn;
60#else
61    ScrnInfoPtr pScrn = (ScrnInfoPtr)(xf86Screens[b->scrnIndex]);
62#endif
63    SavagePtr psav = SAVPTR(pScrn);
64    unsigned char reg = 0x10;
65
66    InI2CREG(reg,psav->DDCPort);
67
68    *clock = reg & 0x4;
69    *data = reg & 0x8;
70
71    /*ErrorF("SavageI2CGetBits: %d %d\n", *clock, *data); */
72}
73
74Bool
75SavageI2CInit(ScrnInfoPtr pScrn)
76{
77    SavagePtr psav = SAVPTR(pScrn);
78    I2CBusPtr I2CPtr;
79
80    I2CPtr = xf86CreateI2CBusRec();
81    if(!I2CPtr) return FALSE;
82
83    psav->I2C = I2CPtr;
84
85    I2CPtr->BusName    = "I2C bus";
86    I2CPtr->scrnIndex  = pScrn->scrnIndex;
87#ifdef XF86_SCRN_INTERFACE
88    I2CPtr->pScrn  = pScrn;
89#endif
90    I2CPtr->I2CPutBits = SavageI2CPutBits;
91    I2CPtr->I2CGetBits = SavageI2CGetBits;
92
93    if (!xf86I2CBusInit(I2CPtr))
94	return FALSE;
95
96    return TRUE;
97}
98
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101