moved from Mate-Extra

1 files changed, 280 insertions, 0 deletions

diff --git a/src/gpm-backlight-helper.c b/src/gpm-backlight-helper.c
new file mode 100644
index 0000000..4868446
--- /dev/null
+++ b/src/gpm-backlight-helper.c
@@ -0,0 +1,280 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*-
+ *
+ * Copyright (C) 2010 Richard Hughes <[email protected]>
+ *
+ * Licensed under the GNU General Public License Version 2
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+
+#include <unistd.h>
+#include <glib-object.h>
+#include <glib/gi18n.h>
+#include <locale.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#define GCM_BACKLIGHT_HELPER_EXIT_CODE_SUCCESS			0
+#define GCM_BACKLIGHT_HELPER_EXIT_CODE_FAILED			1
+#define GCM_BACKLIGHT_HELPER_EXIT_CODE_ARGUMENTS_INVALID	3
+#define GCM_BACKLIGHT_HELPER_EXIT_CODE_INVALID_USER		4
+
+#define GCM_BACKLIGHT_HELPER_SYSFS_LOCATION			"/sys/class/backlight"
+
+/**
+ * gcm_backlight_helper_get_best_backlight:
+ **/
+static gchar *
+gcm_backlight_helper_get_best_backlight ()
+{
+	gchar *filename;
+	guint i;
+	gboolean ret;
+	GDir *dir = NULL;
+	GError *error = NULL;
+	const gchar *first_device;
+
+	/* available kernel interfaces in priority order */
+	static const gchar *backlight_interfaces[] = {
+		"nv_backlight",
+		"asus_laptop",
+		"toshiba",
+		"eeepc",
+		"thinkpad_screen",
+		"acpi_video1",
+		"mbp_backlight",
+		"acpi_video0",
+		"fujitsu-laptop",
+		"sony",
+		"samsung",
+		NULL,
+	};
+
+	/* search each one */
+	for (i=0; backlight_interfaces[i] != NULL; i++) {
+		filename = g_build_filename (GCM_BACKLIGHT_HELPER_SYSFS_LOCATION,
+					     backlight_interfaces[i], NULL);
+		ret = g_file_test (filename, G_FILE_TEST_EXISTS);
+		if (ret)
+			goto out;
+		g_free (filename);
+	}
+
+	/* nothing found in the ordered list */
+	filename = NULL;
+
+	/* find any random ones */
+	dir = g_dir_open (GCM_BACKLIGHT_HELPER_SYSFS_LOCATION, 0, &error);
+	if (dir == NULL) {
+		g_warning ("failed to find any devices: %s", error->message);
+		g_error_free (error);
+		goto out;
+	}
+
+	/* get first device if any */
+	first_device = g_dir_read_name (dir);
+	if (first_device != NULL) {
+		filename = g_build_filename (GCM_BACKLIGHT_HELPER_SYSFS_LOCATION,
+					     first_device, NULL);
+	}
+out:
+	if (dir != NULL)
+		g_dir_close (dir);
+	return filename;
+}
+
+/**
+ * gcm_backlight_helper_write:
+ **/
+static gboolean
+gcm_backlight_helper_write (const gchar *filename, gint value, GError **error)
+{
+	gchar *text = NULL;
+	gint retval;
+	gint length;
+	gint fd = -1;
+	gboolean ret = TRUE;
+
+	fd = open (filename, O_WRONLY);
+	if (fd < 0) {
+		ret = FALSE;
+		g_set_error (error, 1, 0, "failed to open filename: %s", filename);
+		goto out;
+	}
+
+	/* convert to text */
+	text = g_strdup_printf ("%i", value);
+	length = strlen (text);
+
+	/* write to device file */
+	retval = write (fd, text, length);
+	if (retval != length) {
+		ret = FALSE;
+		g_set_error (error, 1, 0, "writing '%s' to %s failed", text, filename);
+		goto out;
+	}
+out:
+	if (fd >= 0)
+		close (fd);
+	g_free (text);
+	return ret;
+}
+
+/**
+ * main:
+ **/
+gint
+main (gint argc, gchar *argv[])
+{
+	GOptionContext *context;
+	gint uid;
+	gint euid;
+	guint retval = 0;
+	const gchar *pkexec_uid_str;
+	GError *error = NULL;
+	gboolean ret = FALSE;
+	gint set_brightness = -1;
+	gboolean get_brightness = FALSE;
+	gboolean get_max_brightness = FALSE;
+	gchar *filename = NULL;
+	gchar *filename_file = NULL;
+	gchar *contents = NULL;
+
+	const GOptionEntry options[] = {
+		{ "set-brightness", '\0', 0, G_OPTION_ARG_INT, &set_brightness,
+		   /* command line argument */
+		  _("Set the current brightness"), NULL },
+		{ "get-brightness", '\0', 0, G_OPTION_ARG_NONE, &get_brightness,
+		   /* command line argument */
+		  _("Get the current brightness"), NULL },
+		{ "get-max-brightness", '\0', 0, G_OPTION_ARG_NONE, &get_max_brightness,
+		   /* command line argument */
+		  _("Get the number of brightness levels supported"), NULL },
+		{ NULL}
+	};
+
+	/* setup translations */
+	setlocale (LC_ALL, "");
+	bindtextdomain (GETTEXT_PACKAGE, MATELOCALEDIR);
+	bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
+	textdomain (GETTEXT_PACKAGE);
+
+	/* setup type system */
+	g_type_init ();
+
+	context = g_option_context_new (NULL);
+	/* TRANSLATORS: tool that is used when copying profiles system-wide */
+	g_option_context_set_summary (context, _("MATE Power Manager Backlight Helper"));
+	g_option_context_add_main_entries (context, options, NULL);
+	g_option_context_parse (context, &argc, &argv, NULL);
+	g_option_context_free (context);
+
+	/* no input */
+	if (set_brightness == -1 && !get_brightness && !get_max_brightness) {
+		/* TRANSLATORS: user did not specify valid options */
+		g_print ("%s\n", _("No valid option was specified"));
+		retval = GCM_BACKLIGHT_HELPER_EXIT_CODE_ARGUMENTS_INVALID;
+		goto out;
+	}
+
+	/* find device */
+	filename = gcm_backlight_helper_get_best_backlight ();
+	if (filename == NULL) {
+		/* TRANSLATORS: no backlights found */
+		g_print ("%s\n", _("No backlights were found on your system"));
+		retval = GCM_BACKLIGHT_HELPER_EXIT_CODE_INVALID_USER;
+		goto out;
+	}
+
+	/* GetBrightness */
+	if (get_brightness) {
+		filename_file = g_build_filename (filename, "brightness", NULL);
+		ret = g_file_get_contents (filename_file, &contents, NULL, &error);
+		if (!ret) {
+			/* TRANSLATORS: failed to access backlight file */
+			g_print ("%s: %s\n", _("Could not get the value of the backlight"), error->message);
+			g_error_free (error);
+			retval = GCM_BACKLIGHT_HELPER_EXIT_CODE_ARGUMENTS_INVALID;
+			goto out;
+		}
+
+		/* just print the contents to stdout */
+		g_print ("%s", contents);
+		retval = GCM_BACKLIGHT_HELPER_EXIT_CODE_SUCCESS;
+		goto out;
+	}
+
+	/* GetSteps */
+	if (get_max_brightness) {
+		filename_file = g_build_filename (filename, "max_brightness", NULL);
+		ret = g_file_get_contents (filename_file, &contents, NULL, &error);
+		if (!ret) {
+			/* TRANSLATORS: failed to access backlight file */
+			g_print ("%s: %s\n", _("Could not get the maximum value of the backlight"), error->message);
+			g_error_free (error);
+			retval = GCM_BACKLIGHT_HELPER_EXIT_CODE_ARGUMENTS_INVALID;
+			goto out;
+		}
+
+		/* just print the contents to stdout */
+		g_print ("%s", contents);
+		retval = GCM_BACKLIGHT_HELPER_EXIT_CODE_SUCCESS;
+		goto out;
+	}
+
+	/* get calling process */
+	uid = getuid ();
+	euid = geteuid ();
+	if (uid != 0 || euid != 0) {
+		/* TRANSLATORS: only able to install profiles as root */
+		g_print ("%s\n", _("This program can only be used by the root user"));
+		retval = GCM_BACKLIGHT_HELPER_EXIT_CODE_ARGUMENTS_INVALID;
+		goto out;
+	}
+
+	/* check we're not being spoofed */
+	pkexec_uid_str = g_getenv ("PKEXEC_UID");
+	if (pkexec_uid_str == NULL) {
+		/* TRANSLATORS: the program must never be directly run */
+		g_print ("%s\n", _("This program must only be run through pkexec"));
+		retval = GCM_BACKLIGHT_HELPER_EXIT_CODE_INVALID_USER;
+		goto out;
+	}
+
+	/* SetBrightness */
+	if (set_brightness != -1) {
+		filename_file = g_build_filename (filename, "brightness", NULL);
+		ret = gcm_backlight_helper_write (filename_file, set_brightness, &error);
+		if (!ret) {
+			/* TRANSLATORS: failed to access backlight file */
+			g_print ("%s: %s\n", _("Could not set the value of the backlight"), error->message);
+			g_error_free (error);
+			retval = GCM_BACKLIGHT_HELPER_EXIT_CODE_ARGUMENTS_INVALID;
+			goto out;
+		}
+	}
+
+	/* success */
+	retval = GCM_BACKLIGHT_HELPER_EXIT_CODE_SUCCESS;
+out:
+	g_free (filename);
+	g_free (filename_file);
+	g_free (contents);
+	return retval;
+}
+