473 lines
12 KiB
C
473 lines
12 KiB
C
/* xf86DDC.c
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*
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* Copyright 1998,1999 by Egbert Eich <Egbert.Eich@Physik.TU-Darmstadt.DE>
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*/
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/*
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* A note on terminology. DDC1 is the original dumb serial protocol, and
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* can only do up to 128 bytes of EDID. DDC2 is I2C-encapsulated and
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* introduces extension blocks. EDID is the old display identification
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* block, DisplayID is the new one.
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*/
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#ifdef HAVE_XORG_CONFIG_H
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#include <xorg-config.h>
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#endif
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#include "os/osdep.h"
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#include "misc.h"
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#include "xf86.h"
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#include "xf86_OSproc.h"
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#include "xf86DDC.h"
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#include <string.h>
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#define RETRIES 4
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typedef enum {
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DDCOPT_NODDC1,
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DDCOPT_NODDC2,
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DDCOPT_NODDC
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} DDCOpts;
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static const OptionInfoRec DDCOptions[] = {
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{DDCOPT_NODDC1, "NoDDC1", OPTV_BOOLEAN, {0}, FALSE},
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{DDCOPT_NODDC2, "NoDDC2", OPTV_BOOLEAN, {0}, FALSE},
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{DDCOPT_NODDC, "NoDDC", OPTV_BOOLEAN, {0}, FALSE},
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{-1, NULL, OPTV_NONE, {0}, FALSE},
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};
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/* DDC1 */
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static int
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find_start(unsigned int *ptr)
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{
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unsigned int comp[9], test[9];
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int i, j;
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for (i = 0; i < 9; i++) {
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comp[i] = *(ptr++);
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test[i] = 1;
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}
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for (i = 0; i < 127; i++) {
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for (j = 0; j < 9; j++) {
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test[j] = test[j] & !(comp[j] ^ *(ptr++));
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}
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}
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for (i = 0; i < 9; i++)
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if (test[i])
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return i + 1;
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return -1;
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}
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static unsigned char *
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find_header(unsigned char *block)
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{
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unsigned char *ptr, *head_ptr, *end;
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unsigned char header[] = { 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00 };
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ptr = block;
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end = block + EDID1_LEN;
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while (ptr < end) {
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int i;
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head_ptr = ptr;
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for (i = 0; i < 8; i++) {
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if (header[i] != *(head_ptr++))
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break;
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if (head_ptr == end)
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head_ptr = block;
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}
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if (i == 8)
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break;
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ptr++;
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}
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if (ptr == end)
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return NULL;
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return ptr;
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}
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static unsigned char *
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resort(unsigned char *s_block)
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{
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unsigned char *d_new, *d_ptr, *d_end, *s_ptr, *s_end;
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unsigned char tmp;
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s_ptr = find_header(s_block);
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if (!s_ptr)
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return NULL;
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s_end = s_block + EDID1_LEN;
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d_new = malloc(EDID1_LEN);
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if (!d_new)
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return NULL;
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d_end = d_new + EDID1_LEN;
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for (d_ptr = d_new; d_ptr < d_end; d_ptr++) {
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tmp = *(s_ptr++);
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*d_ptr = tmp;
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if (s_ptr == s_end)
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s_ptr = s_block;
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}
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free(s_block);
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return d_new;
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}
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static int
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DDC_checksum(const unsigned char *block, int len)
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{
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int i, result = 0;
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int not_null = 0;
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for (i = 0; i < len; i++) {
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not_null |= block[i];
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result += block[i];
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}
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#ifdef DEBUG
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if (result & 0xFF)
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ErrorF("DDC checksum not correct\n");
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if (!not_null)
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ErrorF("DDC read all Null\n");
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#endif
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/* catch the trivial case where all bytes are 0 */
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if (!not_null)
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return 1;
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return result & 0xFF;
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}
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static unsigned char *
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GetEDID_DDC1(unsigned int *s_ptr)
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{
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unsigned char *d_block, *d_pos;
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unsigned int *s_pos, *s_end;
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int s_start;
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int i, j;
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s_start = find_start(s_ptr);
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if (s_start == -1)
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return NULL;
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s_end = s_ptr + NUM;
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s_pos = s_ptr + s_start;
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d_block = calloc(1, EDID1_LEN);
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if (!d_block)
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return NULL;
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d_pos = d_block;
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for (i = 0; i < EDID1_LEN; i++) {
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for (j = 0; j < 8; j++) {
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*d_pos <<= 1;
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if (*s_pos) {
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*d_pos |= 0x01;
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}
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s_pos++;
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if (s_pos == s_end)
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s_pos = s_ptr;
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};
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s_pos++;
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if (s_pos == s_end)
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s_pos = s_ptr;
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d_pos++;
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}
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free(s_ptr);
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if (d_block && DDC_checksum(d_block, EDID1_LEN)) {
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free(d_block);
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return NULL;
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}
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return (resort(d_block));
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}
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/* fetch entire EDID record; DDC bit needs to be masked */
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static unsigned int *
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FetchEDID_DDC1(register ScrnInfoPtr pScrn,
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register unsigned int (*read_DDC) (ScrnInfoPtr))
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{
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int count = NUM;
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unsigned int *ptr, *xp;
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ptr = xp = malloc(sizeof(int) * NUM);
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if (!ptr)
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return NULL;
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do {
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/* wait for next retrace */
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*xp = read_DDC(pScrn);
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xp++;
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} while (--count);
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return ptr;
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}
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/* test if DDC1 return 0 if not */
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static Bool
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TestDDC1(ScrnInfoPtr pScrn, unsigned int (*read_DDC) (ScrnInfoPtr))
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{
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int old, count;
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old = read_DDC(pScrn);
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count = HEADER * BITS_PER_BYTE;
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do {
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/* wait for next retrace */
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if (old != read_DDC(pScrn))
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break;
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} while (count--);
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return count;
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}
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/*
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* read EDID record , pass it to callback function to interpret.
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* callback function will store it for further use by calling
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* function; it will also decide if we need to reread it
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*/
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static unsigned char *
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EDIDRead_DDC1(ScrnInfoPtr pScrn, DDC1SetSpeedProc DDCSpeed,
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unsigned int (*read_DDC) (ScrnInfoPtr))
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{
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unsigned char *EDID_block = NULL;
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int count = RETRIES;
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if (!read_DDC) {
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xf86DrvMsg(pScrn->scrnIndex, X_PROBED,
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"chipset doesn't support DDC1\n");
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return NULL;
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};
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if (TestDDC1(pScrn, read_DDC) == -1) {
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xf86DrvMsg(pScrn->scrnIndex, X_PROBED, "No DDC signal\n");
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return NULL;
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};
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if (DDCSpeed)
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DDCSpeed(pScrn, DDC_FAST);
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do {
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EDID_block = GetEDID_DDC1(FetchEDID_DDC1(pScrn, read_DDC));
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count--;
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} while (!EDID_block && count);
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if (DDCSpeed)
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DDCSpeed(pScrn, DDC_SLOW);
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return EDID_block;
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}
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/**
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* Attempts to probe the monitor for EDID information, if NoDDC and NoDDC1 are
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* unset. EDID information blocks are interpreted and the results returned in
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* an xf86MonPtr.
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*
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* This function does not affect the list of modes used by drivers -- it is up
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* to the driver to decide policy on what to do with EDID information.
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*
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* @return pointer to a new xf86MonPtr containing the EDID information.
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* @return NULL if no monitor attached or failure to interpret the EDID.
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*/
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xf86MonPtr
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xf86DoEDID_DDC1(ScrnInfoPtr pScrn, DDC1SetSpeedProc DDC1SetSpeed,
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unsigned int (*DDC1Read) (ScrnInfoPtr))
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{
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unsigned char *EDID_block = NULL;
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xf86MonPtr tmp = NULL;
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/* Default DDC and DDC1 to enabled. */
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Bool noddc = FALSE, noddc1 = FALSE;
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OptionInfoPtr options;
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options = XNFalloc(sizeof(DDCOptions));
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(void) memcpy(options, DDCOptions, sizeof(DDCOptions));
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xf86ProcessOptions(pScrn->scrnIndex, pScrn->options, options);
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xf86GetOptValBool(options, DDCOPT_NODDC, &noddc);
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xf86GetOptValBool(options, DDCOPT_NODDC1, &noddc1);
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free(options);
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if (noddc || noddc1)
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return NULL;
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OsBlockSignals();
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EDID_block = EDIDRead_DDC1(pScrn, DDC1SetSpeed, DDC1Read);
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OsReleaseSignals();
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if (EDID_block) {
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tmp = xf86InterpretEDID(pScrn->scrnIndex, EDID_block);
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}
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#ifdef DEBUG
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else
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ErrorF("No EDID block returned\n");
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if (!tmp)
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ErrorF("Cannot interpret EDID block\n");
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#endif
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return tmp;
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}
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/* DDC2 */
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static I2CDevPtr
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DDC2MakeDevice(I2CBusPtr pBus, int address, const char *name)
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{
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I2CDevPtr dev = NULL;
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if (!(dev = xf86I2CFindDev(pBus, address))) {
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dev = xf86CreateI2CDevRec();
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dev->DevName = name;
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dev->SlaveAddr = address;
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dev->ByteTimeout = 2200; /* VESA DDC spec 3 p. 43 (+10 %) */
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dev->StartTimeout = 550;
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dev->BitTimeout = 40;
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dev->AcknTimeout = 40;
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dev->pI2CBus = pBus;
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if (!xf86I2CDevInit(dev)) {
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xf86DrvMsg(pBus->scrnIndex, X_PROBED, "No DDC2 device\n");
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return NULL;
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}
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}
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return dev;
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}
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static I2CDevPtr
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DDC2Init(I2CBusPtr pBus)
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{
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I2CDevPtr dev = NULL;
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/*
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* Slow down the bus so that older monitors don't
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* miss things.
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*/
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pBus->RiseFallTime = 20;
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dev = DDC2MakeDevice(pBus, 0x00A0, "ddc2");
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if (xf86I2CProbeAddress(pBus, 0x0060))
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DDC2MakeDevice(pBus, 0x0060, "E-EDID segment register");
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return dev;
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}
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/* Mmmm, smell the hacks */
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static void
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EEDIDStop(I2CDevPtr d)
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{
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}
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/* block is the EDID block number. a segment is two blocks. */
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static Bool
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DDC2Read(I2CDevPtr dev, int block, unsigned char *R_Buffer)
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{
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unsigned char W_Buffer[1];
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int i, segment;
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I2CDevPtr seg;
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void (*stop) (I2CDevPtr);
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for (i = 0; i < RETRIES; i++) {
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/* Stop bits reset the segment pointer to 0, so be careful here. */
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segment = block >> 1;
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if (segment) {
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Bool b;
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if (!(seg = xf86I2CFindDev(dev->pI2CBus, 0x0060)))
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return FALSE;
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W_Buffer[0] = segment;
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stop = dev->pI2CBus->I2CStop;
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dev->pI2CBus->I2CStop = EEDIDStop;
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b = xf86I2CWriteRead(seg, W_Buffer, 1, NULL, 0);
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dev->pI2CBus->I2CStop = stop;
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if (!b) {
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dev->pI2CBus->I2CStop(dev);
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continue;
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}
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}
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W_Buffer[0] = (block & 0x01) * EDID1_LEN;
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if (xf86I2CWriteRead(dev, W_Buffer, 1, R_Buffer, EDID1_LEN)) {
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if (!DDC_checksum(R_Buffer, EDID1_LEN))
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return TRUE;
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}
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}
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return FALSE;
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}
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/**
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* Attempts to probe the monitor for EDID information, if NoDDC and NoDDC2 are
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* unset. EDID information blocks are interpreted and the results returned in
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* an xf86MonPtr. Unlike xf86DoEDID_DDC[12](), this function will return
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* the complete EDID data, including all extension blocks, if the 'complete'
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* parameter is TRUE;
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*
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* This function does not affect the list of modes used by drivers -- it is up
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* to the driver to decide policy on what to do with EDID information.
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*
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* @return pointer to a new xf86MonPtr containing the EDID information.
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* @return NULL if no monitor attached or failure to interpret the EDID.
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*/
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xf86MonPtr
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xf86DoEEDID(ScrnInfoPtr pScrn, I2CBusPtr pBus, Bool complete)
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{
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unsigned char *EDID_block = NULL;
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xf86MonPtr tmp = NULL;
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I2CDevPtr dev = NULL;
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/* Default DDC and DDC2 to enabled. */
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Bool noddc = FALSE, noddc2 = FALSE;
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OptionInfoPtr options;
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options = malloc(sizeof(DDCOptions));
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if (!options)
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return NULL;
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memcpy(options, DDCOptions, sizeof(DDCOptions));
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xf86ProcessOptions(pScrn->scrnIndex, pScrn->options, options);
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xf86GetOptValBool(options, DDCOPT_NODDC, &noddc);
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xf86GetOptValBool(options, DDCOPT_NODDC2, &noddc2);
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free(options);
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if (noddc || noddc2)
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return NULL;
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if (!(dev = DDC2Init(pBus)))
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return NULL;
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EDID_block = calloc(1, EDID1_LEN);
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if (!EDID_block)
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return NULL;
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if (DDC2Read(dev, 0, EDID_block)) {
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int i, n = EDID_block[0x7e];
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if (complete && n) {
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EDID_block = reallocarray(EDID_block, 1 + n, EDID1_LEN);
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for (i = 0; i < n; i++)
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DDC2Read(dev, i + 1, EDID_block + (EDID1_LEN * (1 + i)));
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}
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tmp = xf86InterpretEEDID(pScrn->scrnIndex, EDID_block);
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}
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if (tmp && complete)
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tmp->flags |= MONITOR_EDID_COMPLETE_RAWDATA;
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return tmp;
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}
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/**
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* Attempts to probe the monitor for EDID information, if NoDDC and NoDDC2 are
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* unset. EDID information blocks are interpreted and the results returned in
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* an xf86MonPtr.
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*
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* This function does not affect the list of modes used by drivers -- it is up
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* to the driver to decide policy on what to do with EDID information.
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*
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* @return pointer to a new xf86MonPtr containing the EDID information.
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* @return NULL if no monitor attached or failure to interpret the EDID.
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*/
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xf86MonPtr
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xf86DoEDID_DDC2(ScrnInfoPtr pScrn, I2CBusPtr pBus)
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{
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return xf86DoEEDID(pScrn, pBus, FALSE);
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}
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