drivers/video/fbdev/core/fbmon.c

Source file repositories/reference/linux-study-clean/drivers/video/fbdev/core/fbmon.c

File Facts

System
Linux kernel
Corpus path
drivers/video/fbdev/core/fbmon.c
Extension
.c
Size
38638 bytes
Lines
1526
Domain
Driver Families
Bucket
drivers/video
Inferred role
Driver Families: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct broken_edid {
	u8  manufacturer[4];
	u32 model;
	u32 fix;
};

static const struct broken_edid brokendb[] = {
	/* DEC FR-PCXAV-YZ */
	{
		.manufacturer = "DEC",
		.model        = 0x073a,
		.fix          = FBMON_FIX_HEADER,
	},
	/* ViewSonic PF775a */
	{
		.manufacturer = "VSC",
		.model        = 0x5a44,
		.fix          = FBMON_FIX_INPUT,
	},
	/* Sharp UXGA? */
	{
		.manufacturer = "SHP",
		.model        = 0x138e,
		.fix          = FBMON_FIX_TIMINGS,
	},
};

static const unsigned char edid_v1_header[] = { 0x00, 0xff, 0xff, 0xff,
	0xff, 0xff, 0xff, 0x00
};

static void copy_string(unsigned char *c, unsigned char *s)
{
  int i;
  c = c + 5;
  for (i = 0; (i < 13 && *c != 0x0A); i++)
    *(s++) = *(c++);
  *s = 0;
  while (i-- && (*--s == 0x20)) *s = 0;
}

static int edid_is_serial_block(unsigned char *block)
{
	if ((block[0] == 0x00) && (block[1] == 0x00) &&
	    (block[2] == 0x00) && (block[3] == 0xff) &&
	    (block[4] == 0x00))
		return 1;
	else
		return 0;
}

static int edid_is_ascii_block(unsigned char *block)
{
	if ((block[0] == 0x00) && (block[1] == 0x00) &&
	    (block[2] == 0x00) && (block[3] == 0xfe) &&
	    (block[4] == 0x00))
		return 1;
	else
		return 0;
}

static int edid_is_limits_block(unsigned char *block)
{
	if ((block[0] == 0x00) && (block[1] == 0x00) &&
	    (block[2] == 0x00) && (block[3] == 0xfd) &&
	    (block[4] == 0x00))
		return 1;
	else
		return 0;
}

static int edid_is_monitor_block(unsigned char *block)
{
	if ((block[0] == 0x00) && (block[1] == 0x00) &&
	    (block[2] == 0x00) && (block[3] == 0xfc) &&
	    (block[4] == 0x00))
		return 1;
	else
		return 0;
}

static int edid_is_timing_block(unsigned char *block)
{
	if ((block[0] != 0x00) || (block[1] != 0x00) ||
	    (block[2] != 0x00) || (block[4] != 0x00))
		return 1;
	else
		return 0;
}

Annotation

Implementation Notes