diff options
| -rw-r--r-- | .gitignore | 14 | ||||
| -rw-r--r-- | Makefile.am | 6 | ||||
| -rwxr-xr-x | autogen.sh | 12 | ||||
| -rw-r--r-- | configure.ac | 15 | ||||
| -rw-r--r-- | vbe_edid.c | 189 |
5 files changed, 236 insertions, 0 deletions
diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..40d3a4b --- /dev/null +++ b/.gitignore @@ -0,0 +1,14 @@ +.deps/ +Makefile +Makefile.in +aclocal.m4 +autom4te.cache/ +config.log +config.status +configure +depcomp +install-sh +missing +*.edid +*.o +vbe_edid diff --git a/Makefile.am b/Makefile.am new file mode 100644 index 0000000..2a7e1bd --- /dev/null +++ b/Makefile.am @@ -0,0 +1,6 @@ +AUTOMAKE_OPTIONS = foreign + +sbin_PROGRAMS = vbe-edid + +vbe_edid_SOURCES = vbe_edid.c +vbe_edid_LDADD = -lx86 diff --git a/autogen.sh b/autogen.sh new file mode 100755 index 0000000..354f254 --- /dev/null +++ b/autogen.sh @@ -0,0 +1,12 @@ +#! /bin/sh + +srcdir=`dirname $0` +test -z "$srcdir" && srcdir=. + +ORIGDIR=`pwd` +cd $srcdir + +autoreconf -v --install || exit 1 +cd $ORIGDIR || exit $? + +$srcdir/configure "$@" diff --git a/configure.ac b/configure.ac new file mode 100644 index 0000000..32e671a --- /dev/null +++ b/configure.ac @@ -0,0 +1,15 @@ +dnl Process this file with autoconf to produce a configure script. + +AC_INIT(vbe-edid, 0.0.1) +AM_INIT_AUTOMAKE() + +dnl Checks for programs + +CFLAGS="-g -O0 -Wall" + +AC_PROG_CC + +AC_CHECK_LIB([x86], [LRMI_init], [], [AC_MSG_ERROR([libx86 not found])]) +AC_CHECK_HEADER([libx86.h], [], [AC_MSG_ERROR([libx86.h not found])]) + +AC_OUTPUT([Makefile]) diff --git a/vbe_edid.c b/vbe_edid.c new file mode 100644 index 0000000..0d8e056 --- /dev/null +++ b/vbe_edid.c @@ -0,0 +1,189 @@ +/* + * Copyright (c) 2010 Luc Verhaegen <libv@skynet.be> + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sub license, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the + * next paragraph) shall be included in all copies or substantial portions + * of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER + * DEALINGS IN THE SOFTWARE. + */ + +/* + * Based on get-edid.c by John Fremlin, but this one is actual C code, and + * the content of get-edid.c or this file is not exactly rocket-science. + */ + +#include <stdio.h> +#include <string.h> +#include <errno.h> +#include <sys/io.h> +#include <unistd.h> +#include <fcntl.h> + +#include <libx86.h> + +static int +vbe_call(struct LRMI_regs *regs, unsigned char al, unsigned char bl) +{ + regs->eax = 0x4F00 | al; + regs->ebx = bl; + + if (!LRMI_int(0x10, regs)) { + fprintf(stderr, "%s: LRMI_int failed!\n", __func__); + return -1; + } + + if (regs->eax == 0x4F) + return 0; + else if (regs->eax == 0x014F) { + fprintf(stderr, "VBE Call 0x%02X failed!\n", al); + return -1; + } else { + fprintf(stderr, "VBE Call 0x%02X is unsupported!\n", al); + return -1; + } +} + +static int +vbe_controller_info(void) +{ + struct LRMI_regs regs = { 0 }; + unsigned char *info; + int ret; + + info = LRMI_alloc_real(512); + if (!info) { + fprintf(stderr, "Error: %s: LRMI_alloc_real failed!\n", + __func__); + return -1; + } + + memcpy(info, "VBE2", 4); + regs.es = ((unsigned long) info) >> 4; + regs.edi = 0; + + ret = vbe_call(®s, 0x00, 0x00); + if (!ret) + printf("Found VBE Version %d.%d.\n", info[5], info[4]); + + LRMI_free_real(info); + + return ret; +} + +static int +edid_dump(unsigned char *edid, int size) +{ + char name[4], filename[14]; + unsigned short model; + int fd; + + if ((size < 128) || + memcmp(edid, "\x00\xFF\xFF\xFF\xFF\xFF\xFF\x00", 8)) { + fprintf(stderr, "Error: Invalid EDID header!\n"); + return -1; + } + + name[0] = edid[8] >> 2; + name[1] = ((edid[8] & 0x03) << 3) | (edid[9] >> 5); + name[2] = edid[9] & 0x1F; + + if ((name[0] && (name[0] < 27)) && + (name[1] && (name[1] < 27)) && + (name[2] && (name[2] < 27))) { + name[0] += 0x60; + name[1] += 0x60; + name[2] += 0x60; + } else { + name[0] = 'x'; + name[1] = 'x'; + name[2] = 'x'; + } + name[3] = 0; + + model = edid[0x0A] | (edid[0x0B] << 8); + + sprintf(filename, "%s-%04x.edid", name, model); + + fd = open(filename, O_WRONLY | O_CREAT | O_EXCL); + if (fd < 0) { + fprintf(stderr, "Failed to open %s: %s\n", + filename, strerror(errno)); + return -errno; + } + + if (write(fd, edid, size) == -1) { + fprintf(stderr, "Failed to write to %s: %s\n", + filename, strerror(errno)); + return -errno; + } + + printf("Dumped %d bytes to %s\n", size, filename); + + close(fd); + + return 0; +} + +static int +vbe_edid_read(void) +{ + struct LRMI_regs regs = { 0 }; + unsigned char *edid; + int ret = 0; + + edid = LRMI_alloc_real(128); + if (!edid) { + fprintf(stderr, "Error: %s: LRMI_ALLOC_REAL failed!\n", + __func__); + return -1; + } + + regs.es = ((unsigned long) edid) >> 4; + regs.edi = 0; + regs.ecx = 0; + regs.edx = 1; + + ret = vbe_call(®s, 0x15, 0x01); + if (!ret) + edid_dump(edid, 128); + + LRMI_free_real(edid); + + return ret; +} + +int +main(int argc, char *argv[]) +{ + int ret; + + if (iopl(3)) { + fprintf(stderr, "Error: iopl failed: %s\n", strerror(errno)); + return -errno; + } + + if (!LRMI_init()) { + fprintf(stderr, "Error: LRMI_init() failed!\n"); + return -1; + } + + ret = vbe_controller_info(); + if (!ret) + ret = vbe_edid_read(); + + return ret; +} |