diff options
| author | Erik Gilling <konkers@android.com> | 2010-11-11 15:44:43 +0100 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2010-11-15 14:52:19 +0900 |
| commit | 9fbbdde93231ad7f35c217aa6bbbc7995133f483 (patch) | |
| tree | e934daa8bd6f0d4f68f3034f933ab149682ccccd /drivers/video/fbmon.c | |
| parent | a7bcf21e60c73cb7f7c13fad928967d7e47c3cac (diff) | |
video: add fb_edid_add_monspecs for parsing extended edid information
Modern monitors/tvs have more extended EDID information blocks which can
contain extra detailed modes. This adds a fb_edid_add_monspecs function
which drivers can use to parse those additions blocks.
Signed-off-by: Erik Gilling <konkers@android.com>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'drivers/video/fbmon.c')
| -rw-r--r-- | drivers/video/fbmon.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/drivers/video/fbmon.c b/drivers/video/fbmon.c index 563a98b88e9..a0b5a93b72d 100644 --- a/drivers/video/fbmon.c +++ b/drivers/video/fbmon.c @@ -973,6 +973,63 @@ void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs) DPRINTK("========================================\n"); } +void fb_edid_add_monspecs(unsigned char *edid, struct fb_monspecs *specs) +{ + unsigned char *block; + struct fb_videomode *mode, *m; + int num = 0, i, first = 1; + + if (edid == NULL) + return; + + if (!edid_checksum(edid)) + return; + + if (edid[0] != 0x2) + return; + + mode = kzalloc(50 * sizeof(struct fb_videomode), GFP_KERNEL); + if (mode == NULL) + return; + + block = edid + edid[0x2]; + + DPRINTK(" Extended Detailed Timings\n"); + + for (i = 0; i < (128 - edid[0x2]) / DETAILED_TIMING_DESCRIPTION_SIZE; + i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) { + if (!(block[0] == 0x00 && block[1] == 0x00)) { + get_detailed_timing(block, &mode[num]); + if (first) { + mode[num].flag |= FB_MODE_IS_FIRST; + first = 0; + } + num++; + } + } + + /* Yikes, EDID data is totally useless */ + if (!num) { + kfree(mode); + return; + } + + m = kzalloc((specs->modedb_len + num) * + sizeof(struct fb_videomode), GFP_KERNEL); + + if (!m) { + kfree(mode); + return; + } + + memmove(m, specs->modedb, specs->modedb_len * sizeof(struct fb_videomode)); + memmove(m + specs->modedb_len, mode, num * sizeof(struct fb_videomode)); + kfree(mode); + kfree(specs->modedb); + specs->modedb = m; + specs->modedb_len = specs->modedb_len + num; +} + /* * VESA Generalized Timing Formula (GTF) */ |