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[gnome-settings-daemon] wacom: Add helper to set LEDs for mode switching

commit 36d25ad690fd23439274e1199798d6b1f94102b9
Author: Bastien Nocera <hadess hadess net>
Date:   Sun Mar 4 14:17:17 2012 +0000

    wacom: Add helper to set LEDs for mode switching
    
    Based upon the power plugin's backlight helper.

 configure.ac                                       |    2 +-
 plugins/wacom/Makefile.am                          |   28 +++-
 plugins/wacom/gsd-wacom-led-helper.c               |  174 ++++++++++++++++++++
 ...nome.settings-daemon.plugins.wacom.policy.in.in |   31 ++++
 4 files changed, 233 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index ebf37fd..b0ed0da 100644
--- a/configure.ac
+++ b/configure.ac
@@ -199,7 +199,7 @@ dnl ---------------------------------------------------------------------------
 dnl - wacom
 dnl ---------------------------------------------------------------------------
 
-PKG_CHECK_MODULES(WACOM, [libwacom >= $LIBWACOM_REQUIRED_VERSION x11 xi xtst gnome-desktop-3.0 >= $GNOME_DESKTOP_REQUIRED_VERSION xorg-wacom])
+PKG_CHECK_MODULES(WACOM, [libwacom >= $LIBWACOM_REQUIRED_VERSION x11 xi xtst $GUDEV_PKG gnome-desktop-3.0 >= $GNOME_DESKTOP_REQUIRED_VERSION xorg-wacom])
 
 dnl ==============================================
 dnl PackageKit section
diff --git a/plugins/wacom/Makefile.am b/plugins/wacom/Makefile.am
index 375f107..a3086c3 100644
--- a/plugins/wacom/Makefile.am
+++ b/plugins/wacom/Makefile.am
@@ -32,6 +32,32 @@ libgsdwacom_la_LIBADD  =						\
 	$(SETTINGS_PLUGIN_LIBS)						\
 	$(WACOM_LIBS)
 
+org.gnome.settings-daemon.plugins.wacom.policy.in: org.gnome.settings-daemon.plugins.wacom.policy.in.in Makefile
+	$(AM_V_GEN) sed -e "s|\ libexecdir\@|$(libexecdir)|" $< > $@
+
+ INTLTOOL_POLICY_RULE@
+polkit_policydir = $(datadir)/polkit-1/actions
+polkit_policy_in_files = org.gnome.settings-daemon.plugins.wacom.policy.in
+polkit_policy_DATA = $(polkit_policy_in_files:.policy.in=.policy)
+
+# so it always gets included in the tarball
+gsd_wacom_led_helper_SOURCES =	gsd-wacom-led-helper.c
+
+EXTRA_DIST = $(gsd_wacom_led_helper_SOURCES)
+
+if HAVE_GUDEV
+libexec_PROGRAMS = gsd-wacom-led-helper
+
+gsd_wacom_led_helper_LDFLAGS =				\
+	$(BACKLIGHT_HELPER_LIBS)			\
+	-lm
+
+gsd_wacom_led_helper_CFLAGS =				\
+	$(BACKLIGHT_HELPER_CFLAGS)
+endif
+
+EXTRA_DIST += org.gnome.settings-daemon.plugins.wacom.policy.in.in
+
 noinst_PROGRAMS = test-wacom list-wacom
 
 test_wacom_SOURCES =		\
@@ -96,7 +122,7 @@ plugin_in_files = wacom.gnome-settings-plugin.in
 
 plugin_DATA = $(plugin_in_files:.gnome-settings-plugin.in=.gnome-settings-plugin)
 
-EXTRA_DIST = $(plugin_in_files)
+EXTRA_DIST += $(plugin_in_files)
 CLEANFILES = $(plugin_DATA)
 DISTCLEANFILES = $(plugin_DATA)
 
diff --git a/plugins/wacom/gsd-wacom-led-helper.c b/plugins/wacom/gsd-wacom-led-helper.c
new file mode 100644
index 0000000..32b68ca
--- /dev/null
+++ b/plugins/wacom/gsd-wacom-led-helper.c
@@ -0,0 +1,174 @@
+/*
+ * Copyright (C) 2010-2011 Richard Hughes <richard hughsie com>
+ * Copyright (C) 2012      Bastien Nocera <hadess hadess net>
+ *
+ * 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 <glib.h>
+#include <locale.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <string.h>
+#include <gudev/gudev.h>
+
+static gboolean
+gsd_wacom_led_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;
+}
+
+static char *
+get_led_sysfs_path (GUdevDevice *device,
+		    int          group_num)
+{
+	char *status;
+	char *filename;
+
+	status = g_strdup_printf ("status_led%d_select", group_num);
+	filename = g_build_filename (g_udev_device_get_sysfs_path (device), "wacom_led", status, NULL);
+	g_free (status);
+
+	return filename;
+}
+
+static char *path = NULL;
+static int group_num = -1;
+static int led_num = -1;
+
+const GOptionEntry options[] = {
+	{ "path", '\0', 0, G_OPTION_ARG_FILENAME, &path, "Device path for the Wacom device", NULL },
+	{ "group", '\0', 0, G_OPTION_ARG_INT, &group_num, "Which LED group to set", NULL },
+	{ "led", '\0', 0, G_OPTION_ARG_INT, &led_num, "Which LED to set", NULL },
+	{ NULL}
+};
+
+
+int main (int argc, char **argv)
+{
+	GOptionContext *context;
+	GUdevClient *client;
+	GUdevDevice *device, *parent;
+	char *filename;
+	GError *error = NULL;
+        const char * const subsystems[] = { "input", NULL };
+
+	g_type_init ();
+
+	context = g_option_context_new (NULL);
+	g_option_context_set_summary (context, "GNOME Settings Daemon Wacom LED Helper");
+	g_option_context_add_main_entries (context, options, NULL);
+	g_option_context_parse (context, &argc, &argv, NULL);
+
+	if (path == NULL ||
+	    group_num < 0 ||
+	    led_num < 0) {
+		char *txt;
+
+		txt = g_option_context_get_help (context, FALSE, NULL);
+		g_print ("%s", txt);
+		g_free (txt);
+
+		g_option_context_free (context);
+
+		return 1;
+	}
+	g_option_context_free (context);
+
+	client = g_udev_client_new (subsystems);
+	device = g_udev_client_query_by_device_file (client, path);
+	if (device == NULL) {
+		g_debug ("Could not find device '%s' in udev database", path);
+		goto bail;
+	}
+
+	if (g_udev_device_get_property_as_boolean (device, "ID_INPUT_TABLET") == FALSE &&
+	    g_udev_device_get_property_as_boolean (device, "ID_INPUT_TOUCHPAD") == FALSE) {
+		g_debug ("Device '%s' is not a Wacom tablet", path);
+		goto bail;
+	}
+
+	if (g_strcmp0 (g_udev_device_get_property (device, "ID_BUS"), "usb") != 0) {
+		/* FIXME handle Bluetooth LEDs too */
+		g_debug ("Non-USB LEDs setting is not supported");
+		goto bail;
+	}
+
+	parent = g_udev_device_get_parent_with_subsystem (device, "usb", "usb_interface");
+	if (parent == NULL) {
+		g_debug ("Could not find parent USB device for '%s'", path);
+		goto bail;
+	}
+	g_object_unref (device);
+	device = parent;
+
+	filename = get_led_sysfs_path (device, group_num);
+	if (gsd_wacom_led_helper_write (filename, led_num, &error) == FALSE) {
+		g_debug ("Could not set LED status for '%s': %s", path, error->message);
+		g_error_free (error);
+		g_free (filename);
+		goto bail;
+	}
+	g_free (filename);
+
+	g_debug ("Successfully set LED status for '%s', group %d to %d",
+		 path, group_num, led_num);
+
+	g_object_unref (device);
+	g_object_unref (client);
+
+	return 0;
+
+bail:
+	if (device != NULL)
+		g_object_unref (device);
+	if (client != NULL)
+		g_object_unref (client);
+	return 1;
+}
diff --git a/plugins/wacom/org.gnome.settings-daemon.plugins.wacom.policy.in.in b/plugins/wacom/org.gnome.settings-daemon.plugins.wacom.policy.in.in
new file mode 100644
index 0000000..9821827
--- /dev/null
+++ b/plugins/wacom/org.gnome.settings-daemon.plugins.wacom.policy.in.in
@@ -0,0 +1,31 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE policyconfig PUBLIC
+ "-//freedesktop//DTD PolicyKit Policy Configuration 1.0//EN"
+ "http://www.freedesktop.org/standards/PolicyKit/1.0/policyconfig.dtd";>
+<policyconfig>
+
+  <!--
+    Policy definitions for gnome-settings-daemon system-wide actions.
+  -->
+
+  <vendor>GNOME Settings Daemon</vendor>
+  <vendor_url>http://git.gnome.org/browse/gnome-settings-daemon</vendor_url>
+  <icon_name>input-tablet</icon_name>
+
+  <action id="org.gnome.settings-daemon.plugins.wacom.wacom-led-helper">
+    <!-- SECURITY:
+          - A normal active user on the local machine does not need permission
+            to change the LED setting for a Wacom tablet
+     -->
+    <_description>Modify the lit LED for a Wacom tablet</_description>
+    <_message>Authentication is required to modify the lit LED for a Wacom tablet</_message>
+    <defaults>
+      <allow_any>no</allow_any>
+      <allow_inactive>no</allow_inactive>
+      <allow_active>yes</allow_active>
+    </defaults>
+    <annotate key="org.freedesktop.policykit.exec.path">@libexecdir@/gsd-wacom-led-helper</annotate>
+  </action>
+
+</policyconfig>
+
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