Initial xbacklight program

4 files changed, 373 insertions, 0 deletions

diff --git a/Makefile.am b/Makefile.am
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+++ b/Makefile.am
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+# 
+#  Copyright 2005  Red Hat, Inc.
+# 
+#  Permission to use, copy, modify, distribute, and sell this software and its
+#  documentation for any purpose is hereby granted without fee, provided that
+#  the above copyright notice appear in all copies and that both that
+#  copyright notice and this permission notice appear in supporting
+#  documentation, and that the name of Red Hat not be used in
+#  advertising or publicity pertaining to distribution of the software without
+#  specific, written prior permission.  Red Hat makes no
+#  representations about the suitability of this software for any purpose.  It
+#  is provided "as is" without express or implied warranty.
+# 
+#  RED HAT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+#  INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+#  EVENT SHALL RED HAT BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+#  CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
+#  DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+#  TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+#  PERFORMANCE OF THIS SOFTWARE.
+
+AUTOMAKE_OPTIONS = foreign
+
+bin_PROGRAMS = xbacklight
+
+AM_CFLAGS = $(XRANDR_CFLAGS)
+xbacklight_LDADD = $(XRANDR_LIBS)
+
+xbacklight_SOURCES =	\
+        xbacklight.c
+
+appman_PRE = \
+        xbacklight.man
+
+appmandir = $(APP_MAN_DIR)
+
+appman_DATA = $(appman_PRE:man=@APP_MAN_SUFFIX@)
+
+EXTRA_DIST = $(appman_PRE)
+CLEANFILES = $(appman_DATA)
+
+SED = sed
+
+# Strings to replace in man pages
+XORGRELSTRING = @PACKAGE_STRING@
+  XORGMANNAME = X Version 11
+
+MAN_SUBSTS = \
+	-e 's|__vendorversion__|"$(XORGRELSTRING)" "$(XORGMANNAME)"|' \
+	-e 's|__xorgversion__|"$(XORGRELSTRING)" "$(XORGMANNAME)"|' \
+	-e 's|__xservername__|Xorg|g' \
+	-e 's|__xconfigfile__|xorg.conf|g' \
+	-e 's|__projectroot__|$(prefix)|g' \
+	-e 's|__apploaddir__|$(appdefaultdir)|' \
+	-e 's|__appmansuffix__|$(APP_MAN_SUFFIX)|g' \
+	-e 's|__libmansuffix__|$(LIB_MAN_SUFFIX)|g' \
+	-e 's|__adminmansuffix__|$(ADMIN_MAN_SUFFIX)|g' \
+	-e 's|__miscmansuffix__|$(MISC_MAN_SUFFIX)|g' \
+	-e 's|__filemansuffix__|$(FILE_MAN_SUFFIX)|g'
+
+SUFFIXES = .$(APP_MAN_SUFFIX) .man
+
+.man.$(APP_MAN_SUFFIX):
+	sed $(MAN_SUBSTS) < $< > $@
diff --git a/configure.ac b/configure.ac
new file mode 100644
index 0000000..e2eabb7
--- /dev/null
+++ b/configure.ac
@@ -0,0 +1,42 @@
+
+dnl  Copyright 2005 Red Hat, Inc.
+dnl 
+dnl  Permission to use, copy, modify, distribute, and sell this software and its
+dnl  documentation for any purpose is hereby granted without fee, provided that
+dnl  the above copyright notice appear in all copies and that both that
+dnl  copyright notice and this permission notice appear in supporting
+dnl  documentation, and that the name of Red Hat not be used in
+dnl  advertising or publicity pertaining to distribution of the software without
+dnl  specific, written prior permission.  Red Hat makes no
+dnl  representations about the suitability of this software for any purpose.  It
+dnl  is provided "as is" without express or implied warranty.
+dnl 
+dnl  RED HAT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+dnl  INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+dnl  EVENT SHALL RED HAT BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+dnl  CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
+dnl  DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+dnl  TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+dnl  PERFORMANCE OF THIS SOFTWARE.
+dnl
+dnl Process this file with autoconf to create configure.
+
+AC_PREREQ([2.57])
+AC_INIT(xbacklight,[0.0.1], [https://bugs.freedesktop.org/enter_bug.cgi?product=xorg],xbacklight)
+AM_INIT_AUTOMAKE([dist-bzip2])
+AM_MAINTAINER_MODE
+
+AM_CONFIG_HEADER(config.h)
+
+AC_PROG_CC
+AC_PROG_INSTALL
+
+# Checks for pkg-config packages
+PKG_CHECK_MODULES(XRANDR, xrandr >= 1.2.0 xrender x11)
+AC_SUBST(XRANDR_CFLAGS)
+AC_SUBST(XRANDR_LIBS)
+
+XORG_MANPAGE_SECTIONS
+XORG_RELEASE_VERSION
+
+AC_OUTPUT([Makefile])
diff --git a/xbacklight.c b/xbacklight.c
new file mode 100644
index 0000000..df99905
--- /dev/null
+++ b/xbacklight.c
@@ -0,0 +1,214 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <X11/Xatom.h>
+#include <X11/Xlib.h>
+#include <X11/extensions/Xrandr.h>
+
+typedef enum { Get, Set, Inc, Dec } op_t;
+
+static char *program_name;
+
+static Atom backlight;
+
+static void
+usage (void)
+{
+    fprintf(stderr, "usage: %s [options]\n", program_name);
+    fprintf(stderr, "  where options are:\n");
+    fprintf(stderr, "  -display <display> or -d <display>\n");
+    fprintf(stderr, "  -help\n");
+    fprintf(stderr, "  -set <percentage> or = <percentage>\n");
+    fprintf(stderr, "  -inc <percentage> or + <percentage>\n");
+    fprintf(stderr, "  -dec <percentage> or - <percentage>\n");
+    fprintf(stderr, "  -get\n");
+    /*NOTREACHED*/
+    exit (1);
+}
+
+static long
+backlight_get (Display *dpy, RROutput output)
+{
+    unsigned long   nitems;
+    unsigned long   bytes_after;
+    unsigned char   *prop;
+    Atom	    actual_type;
+    int		    actual_format;
+    long	    value;
+    
+    if (XRRGetOutputProperty (dpy, output, backlight,
+			      0, 4, False, False, None,
+			      &actual_type, &actual_format,
+			      &nitems, &bytes_after, &prop) != Success)
+	return -1;
+    if (actual_type != XA_INTEGER || nitems != 1 || actual_format != 32)
+	value = -1;
+    else
+	value = *((long *) prop);
+    XFree (prop);
+    return value;
+}
+
+static void
+backlight_set (Display *dpy, RROutput output, long value)
+{
+    XRRChangeOutputProperty (dpy, output, backlight, XA_INTEGER, 32,
+			     PropModeReplace, (unsigned char *) &value, 1);
+}
+
+int
+main (int argc, char **argv)
+{
+    char    *dpy_name = NULL;
+    Display *dpy;
+    int	    screen;
+    int	    major, minor;
+    op_t    op = Get;
+    int	    value = 0;
+    int	    i;
+
+    program_name = argv[0];
+
+    for (i = 1; i < argc; i++)
+    {
+	if (!strcmp (argv[i], "-display") || !strcmp ("-d", argv[i]))
+	{
+	    if (++i >= argc) usage();
+	    dpy_name = argv[i];
+	    continue;
+	}
+	if (!strcmp (argv[i], "-set") || !strcmp (argv[i], "="))
+	{
+	    if (++i >= argc) usage();
+	    op = Set;
+	    value = atoi (argv[i]);
+	    continue;
+	}
+	if (argv[i][0] == '=' && isdigit (argv[i][1]))
+	{
+	    op = Set;
+	    value = atoi (argv[i] + 1);
+	    continue;
+	}
+	if (!strcmp (argv[i], "-inc") || !strcmp (argv[i], "+"))
+	{
+	    if (++i >= argc) usage();
+	    op = Inc;
+	    value = atoi (argv[i]);
+	    continue;
+	}
+	if (argv[i][0] == '+' && isdigit (argv[i][1]))
+	{
+	    op = Inc;
+	    value = atoi (argv[i] + 1);
+	    continue;
+	}
+	if (!strcmp (argv[i], "-dec") || !strcmp (argv[i], "-"))
+	{
+	    if (++i >= argc) usage();
+	    op = Dec;
+	    value = atoi (argv[i]);
+	    continue;
+	}
+	if (argv[i][0] == '-' && isdigit (argv[i][1]))
+	{
+	    op = Dec;
+	    value = atoi (argv[i] + 1);
+	    continue;
+	}
+	if (!strcmp (argv[i], "-get") || !strcmp (argv[i], "-g"))
+	{
+	    op = Get;
+	    continue;
+	}
+	if (!strcmp (argv[i], "-help") || !strcmp (argv[i], "-?"))
+	{
+	    usage ();
+	}
+    }
+    dpy = XOpenDisplay (dpy_name);
+    if (!dpy)
+    {
+	fprintf (stderr, "Cannot open display \"%s\"\n",
+		 XDisplayName (dpy_name));
+	exit (1);
+    }
+    if (!XRRQueryVersion (dpy, &major, &minor))
+    {
+	fprintf (stderr, "RandR extension missing\n");
+	exit (1);
+    }
+    if (major < 1 || (major == 1 && minor < 2))
+    {
+	fprintf (stderr, "RandR version %d.%d too old\n", major, minor);
+	exit (1);
+    }
+    backlight = XInternAtom (dpy, "BACKLIGHT", True);
+    if (backlight == None)
+    {
+	fprintf (stderr, "No outputs have backlight property\n");
+	exit (1);
+    }
+    for (screen = 0; screen < ScreenCount (dpy); screen++)
+    {
+	Window		    root = RootWindow (dpy, screen);
+	XRRScreenResources  *resources = XRRGetScreenResources (dpy, root);
+	int		    o;
+	
+	if (!resources) continue;
+	for (o = 0; o < resources->noutput; o++)
+	{
+	    RROutput	output = resources->outputs[o];
+	    XRRPropertyInfo *info;
+	    double    	cur, new, step;
+	    double	min, max;
+	    double	set;
+
+	    cur = backlight_get (dpy, output);
+	    if (cur != -1)
+	    {
+		info = XRRQueryOutputProperty (dpy, output, backlight);
+		if (info)
+		{
+		    if (info->range && info->num_values == 2)
+		    {
+			min = info->values[0];
+			max = info->values[1];
+			if (op == Get) {
+			    printf ("%f\n", (cur - min) * 100 / (max - min));
+			} else {
+			    set = value * (max - min) / 100;
+			    switch (op) {
+			    case Set:
+				new = min + set;
+				break;
+			    case Inc:
+				new = cur + set;
+				break;
+			    case Dec:
+				new = cur - set;
+				break;
+			    }
+			    if (new > max) new = max;
+			    if (new < min) new = min;
+			    step = (new - cur) / 50;
+			    for (i = 0; i < 50; i++)
+			    {
+				if (i == 49)
+				    cur = new;
+				else
+				    cur += step;
+				backlight_set (dpy, output, (long) cur);
+				XFlush (dpy);
+				usleep (10 * 1000);
+			    }
+			}
+		    }
+		    XFree (info);
+		}
+	    }
+	}
+							   
+	XRRFreeScreenResources (resources);
+    }
+    XSync (dpy, False);
+}
diff --git a/xbacklight.man b/xbacklight.man
new file mode 100644
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--- /dev/null
+++ b/xbacklight.man
@@ -0,0 +1,53 @@
+.\"
+.\" Copyright © 2007 Keith Packard.\"
+.\" Permission to use, copy, modify, distribute, and sell this software and its
+.\" documentation for any purpose is hereby granted without fee, provided that
+.\" the above copyright notice appear in all copies and that both that
+.\" copyright notice and this permission notice appear in supporting
+.\" documentation, and that the name of Keith Packard not be used in
+.\" advertising or publicity pertaining to distribution of the software without
+.\" specific, written prior permission.  Keith Packard makes no
+.\" representations about the suitability of this software for any purpose.  It
+.\" is provided "as is" without express or implied warranty.
+.\"
+.\" KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+.\" INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+.\" EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+.\" CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
+.\" DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+.\" TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+.\" PERFORMANCE OF THIS SOFTWARE.
+.\"
+.\"
+.TH XBACKLIGHT __appmansuffix__ __vendorversion__
+.SH NAME
+xbacklight \- adjust backlight brightness using RandR extension
+.SH SYNOPSIS
+.B "xbacklight"
+[-help]  [-display \fIdisplay\fP]
+[-get]
+[-set percent]
+[-inc percent]
+[-dec percent]
+.SH DESCRIPTION
+.I Xbacklight
+is used to adjust the backlight brightness where supported. It finds all
+outputs on the X server supporting backlight brightness control and changes
+them all in the same way.
+.IP -get
+Print out the current backlight brightness of each output with such a
+control. The brightness is represented as a percentage of the maximum
+brightness supported.
+.IP "-set \fIpercent\fP"
+Sets each backlight brightness to the specified level.
+.IP "-inc \fIpercent\fP"
+Increases brightness by the specified amount.
+.IP "-dec \fIpercent\fP"
+Decreases brightness by the specified amount.
+.IP --help
+Print out a summary of the usage and exit.
+.SH "SEE ALSO"
+Xrandr(3)
+.SH AUTHORS
+Keith Packard,
+Open Source Technology Center, Intel Corporation.