summaryrefslogtreecommitdiff
path: root/hw/xfree86/ddc/xf86DDC.c
blob: 123bb492e9a98c70725e912e6de4c7c4af71a069 (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
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
/* $XFree86: xc/programs/Xserver/hw/xfree86/ddc/xf86DDC.c,v 1.26 2003/08/22 17:56:24 dawes Exp $ */

/* xf86DDC.c 
 * 
 * Copyright 1998,1999 by Egbert Eich <Egbert.Eich@Physik.TU-Darmstadt.DE>
 */
#include "misc.h"
#include "xf86.h"
#include "xf86_ansic.h"
#include "xf86_OSproc.h"
#include "xf86DDC.h"
#include "ddcPriv.h"

#ifdef XFree86LOADER
static const OptionInfoRec *DDCAvailableOptions(void *unused);
#endif

const char *i2cSymbols[] = {
    "xf86CreateI2CDevRec",
    "xf86I2CDevInit",
    "xf86I2CWriteRead",
    "xf86I2CFindDev",
    "xf86DestroyI2CDevRec",
    NULL
};

#ifdef XFree86LOADER

static MODULESETUPPROTO(ddcSetup);

static XF86ModuleVersionInfo ddcVersRec =
{
    "ddc",
    MODULEVENDORSTRING,
    MODINFOSTRING1,
    MODINFOSTRING2,
    XF86_VERSION_CURRENT,
    1, 0, 0,
    ABI_CLASS_VIDEODRV,		/* needs the video driver ABI */
    ABI_VIDEODRV_VERSION,
    MOD_CLASS_NONE,
    {0,0,0,0}
};

XF86ModuleData ddcModuleData = { &ddcVersRec, ddcSetup, NULL };

ModuleInfoRec DDC = {
    1,
    "DDC",
    NULL,
    0,
    DDCAvailableOptions,
};

static pointer
ddcSetup(pointer module, pointer opts, int *errmaj, int *errmin)
{
    static Bool setupDone = FALSE;

    if (!setupDone) {
	setupDone = TRUE;
#ifndef REMOVE_LOADER_CHECK_MODULE_INFO
	if (xf86LoaderCheckSymbol("xf86AddModuleInfo"))
#endif
	xf86AddModuleInfo(&DDC, module);
	/*
	 * Tell the loader about symbols from other modules that this module
	 * might refer to.
	 */
	LoaderRefSymLists(i2cSymbols, NULL);

    } 
    /*
     * The return value must be non-NULL on success even though there
     * is no TearDownProc.
     */
    return (pointer)1;
}

#endif

#define RETRIES 4

static unsigned char *EDIDRead_DDC1(
    ScrnInfoPtr pScrn,
    void (*)(ScrnInfoPtr,xf86ddcSpeed), 
    unsigned int (*)(ScrnInfoPtr)
);

static Bool TestDDC1(
    ScrnInfoPtr pScrn,
    unsigned int (*)(ScrnInfoPtr)
);

static unsigned int *FetchEDID_DDC1(
    ScrnInfoPtr,
    register unsigned int (*)(ScrnInfoPtr)
);

static unsigned char* EDID1Read_DDC2(
    int scrnIndex, 
    I2CBusPtr pBus
);

static unsigned char * VDIFRead(
    int scrnIndex, 
    I2CBusPtr pBus, 
    int start
);

static unsigned char * DDCRead_DDC2(
    int scrnIndex,
    I2CBusPtr pBus, 
    int start, 
    int len
);

typedef enum {
    DDCOPT_NODDC1,
    DDCOPT_NODDC2,
    DDCOPT_NODDC
} DDCOpts;

static const OptionInfoRec DDCOptions[] = {
    { DDCOPT_NODDC1,	"NoDDC1",	OPTV_BOOLEAN,	{0},	FALSE },
    { DDCOPT_NODDC2,	"NoDDC2",	OPTV_BOOLEAN,	{0},	FALSE },
    { DDCOPT_NODDC,	"NoDDC",	OPTV_BOOLEAN,	{0},	FALSE },
    { -1,		NULL,		OPTV_NONE,	{0},	FALSE },
};

#ifdef XFree86LOADER
/*ARGSUSED*/
static const OptionInfoRec *
DDCAvailableOptions(void *unused)
{
    return (DDCOptions);
}
#endif

xf86MonPtr 
xf86DoEDID_DDC1(
    int scrnIndex, void (*DDC1SetSpeed)(ScrnInfoPtr, xf86ddcSpeed), 
    unsigned int (*DDC1Read)(ScrnInfoPtr)
)
{
    ScrnInfoPtr pScrn = xf86Screens[scrnIndex];
    unsigned char *EDID_block = NULL;
    xf86MonPtr tmp = NULL;
    int sigio;
    /* Default DDC and DDC1 to enabled. */
    Bool noddc = FALSE, noddc1 = FALSE;
    OptionInfoPtr options;

    options = xnfalloc(sizeof(DDCOptions));
    (void)memcpy(options, DDCOptions, sizeof(DDCOptions));
    xf86ProcessOptions(pScrn->scrnIndex, pScrn->options, options);

    xf86GetOptValBool(options, DDCOPT_NODDC, &noddc);
    xf86GetOptValBool(options, DDCOPT_NODDC1, &noddc1);
    xfree(options);
    
    if (noddc || noddc1)
	return NULL;
    
    sigio = xf86BlockSIGIO();
    EDID_block = EDIDRead_DDC1(pScrn,DDC1SetSpeed,DDC1Read);
    xf86UnblockSIGIO(sigio);

    if (EDID_block){
	tmp = xf86InterpretEDID(scrnIndex,EDID_block);
    }
#ifdef DEBUG
	else ErrorF("No EDID block returned\n");
    if (!tmp)
	ErrorF("Cannot interpret EDID block\n");
#endif
	return tmp;
}

xf86MonPtr
xf86DoEDID_DDC2(int scrnIndex, I2CBusPtr pBus)
{
    ScrnInfoPtr pScrn = xf86Screens[scrnIndex];
    unsigned char *EDID_block = NULL;
    unsigned char *VDIF_Block = NULL;
    xf86MonPtr tmp = NULL;
    /* Default DDC and DDC2 to enabled. */
    Bool noddc = FALSE, noddc2 = FALSE;
    OptionInfoPtr options;

    options = xnfalloc(sizeof(DDCOptions));
    (void)memcpy(options, DDCOptions, sizeof(DDCOptions));
    xf86ProcessOptions(pScrn->scrnIndex, pScrn->options, options);

    xf86GetOptValBool(options, DDCOPT_NODDC, &noddc);
    xf86GetOptValBool(options, DDCOPT_NODDC2, &noddc2);
    xfree(options);
    
    if (noddc || noddc2)
	return NULL;

    EDID_block = EDID1Read_DDC2(scrnIndex,pBus);

    if (EDID_block){
	tmp = xf86InterpretEDID(scrnIndex,EDID_block);
    } else {
#ifdef DEBUG
	ErrorF("No EDID block returned\n");
#endif
	return NULL;
    }
#ifdef DEBUG
    if (!tmp)
	ErrorF("Cannot interpret EDID block\n");
    ErrorF("Sections to follow: %i\n",tmp->no_sections);
#endif
    VDIF_Block = 
	VDIFRead(scrnIndex, pBus, EDID1_LEN * (tmp->no_sections + 1));    
    tmp->vdif = xf86InterpretVdif(VDIF_Block);

    return tmp;
}

/* 
 * read EDID record , pass it to callback function to interpret.
 * callback function will store it for further use by calling
 * function; it will also decide if we need to reread it 
 */
static unsigned char *
EDIDRead_DDC1(ScrnInfoPtr pScrn, void (*DDCSpeed)(ScrnInfoPtr,xf86ddcSpeed), 
              unsigned int (*read_DDC)(ScrnInfoPtr))
{
    unsigned char *EDID_block = NULL;
    int count = RETRIES;

    if (!read_DDC) { 
	xf86DrvMsg(pScrn->scrnIndex, X_PROBED, 
		   "chipset doesn't support DDC1\n");
	return NULL; 
    };

    if (TestDDC1(pScrn,read_DDC)==-1) { 
	xf86DrvMsg(pScrn->scrnIndex, X_PROBED, "No DDC signal\n"); 
	return NULL; 
    };

    if (DDCSpeed) DDCSpeed(pScrn,DDC_FAST);
    do {
	EDID_block = GetEDID_DDC1(FetchEDID_DDC1(pScrn,read_DDC)); 
	count --;
    } while (!EDID_block && count);
    if (DDCSpeed) DDCSpeed(pScrn,DDC_SLOW);

    return EDID_block;
}

/* test if DDC1  return 0 if not */
static Bool
TestDDC1(ScrnInfoPtr pScrn, unsigned int (*read_DDC)(ScrnInfoPtr))
{
    int old, count;

    old = read_DDC(pScrn);
    count = HEADER * BITS_PER_BYTE;
    do {
	/* wait for next retrace */
	if (old != read_DDC(pScrn)) break;
    } while(count--);
    return (count);
}

/* fetch entire EDID record; DDC bit needs to be masked */
static unsigned int * 
FetchEDID_DDC1(register ScrnInfoPtr pScrn,
	       register unsigned int (*read_DDC)(ScrnInfoPtr))
{
    int count = NUM;
    unsigned int *ptr, *xp;

    ptr=xp=xalloc(sizeof(int)*NUM); 

    if (!ptr)  return NULL;
    do {
	/* wait for next retrace */
	*xp = read_DDC(pScrn);
	xp++;
    } while(--count);
    return (ptr);
}

static unsigned char*
EDID1Read_DDC2(int scrnIndex, I2CBusPtr pBus)
{
    return  DDCRead_DDC2(scrnIndex, pBus, 0, EDID1_LEN);
}

static unsigned char*
VDIFRead(int scrnIndex, I2CBusPtr pBus, int start)
{
    unsigned char * Buffer, *v_buffer = NULL, *v_bufferp = NULL;
    int i, num = 0;

    /* read VDIF length in 64 byte blocks */
    Buffer = DDCRead_DDC2(scrnIndex, pBus,start,64);
    if (Buffer == NULL)
	return NULL;
#ifdef DEBUG
    ErrorF("number of 64 bit blocks: %i\n",Buffer[0]);
#endif
    if ((num = Buffer[0]) > 0)
	v_buffer = v_bufferp = xalloc(sizeof(unsigned char) * 64 * num);

    for (i = 0; i < num; i++) {
	Buffer = DDCRead_DDC2(scrnIndex, pBus,start,64);
	if (Buffer == NULL) {
	    xfree (v_buffer);
	    return NULL;
	}
	memcpy(v_bufferp,Buffer,63); /* 64th byte is checksum */
	xfree(Buffer);
	v_bufferp += 63;
    }
    return v_buffer;
}

static unsigned char *
DDCRead_DDC2(int scrnIndex, I2CBusPtr pBus, int start, int len)
{
    I2CDevPtr dev;
    unsigned char W_Buffer[2];
    int w_bytes;
    unsigned char *R_Buffer;
    int i;
    
    xf86LoaderReqSymLists(i2cSymbols, NULL);

    if (!(dev = xf86I2CFindDev(pBus, 0x00A0))) {
	dev = xf86CreateI2CDevRec();
	dev->DevName = "ddc2";
	dev->SlaveAddr = 0xA0;
	dev->ByteTimeout = 2200; /* VESA DDC spec 3 p. 43 (+10 %) */
	dev->StartTimeout = 550;
	dev->BitTimeout = 40;
	dev->ByteTimeout = 40;
	dev->AcknTimeout = 40;

	dev->pI2CBus = pBus;
	if (!xf86I2CDevInit(dev)) {
	    xf86DrvMsg(scrnIndex, X_PROBED, "No DDC2 device\n");
	    return NULL;
	}
    }
    if (start < 0x100) {
	w_bytes = 1;
	W_Buffer[0] = start;
    } else {
	w_bytes = 2;
	W_Buffer[0] = start & 0xFF;
	W_Buffer[1] = (start & 0xFF00) >> 8;
    }
    R_Buffer = xcalloc(1,sizeof(unsigned char) 
					* (len));
    for (i=0; i<RETRIES; i++) {
	if (xf86I2CWriteRead(dev, W_Buffer,w_bytes, R_Buffer,len)) {
	    if (!DDC_checksum(R_Buffer,len))
		return R_Buffer;

#ifdef DEBUG
	    else ErrorF("Checksum error in EDID block\n");
#endif
	}
#ifdef DEBUG
	else ErrorF("Error reading EDID block\n");
#endif
    }
    
    xf86DestroyI2CDevRec(dev,TRUE);
    xfree(R_Buffer);
    return NULL;
}