[PATCH 1/3] hald-linux: Add a generic keyboard backlight handler
Henrik Rydberg
rydberg at euromail.se
Thu Oct 9 08:04:49 PDT 2008
Recently, a generic handler for lcd backlight has been added, which
uses the sysfs interface. Moving forward along the same line, this
patch adds a generic keyboard backlight handler, which operates in a
similar fashion.
Signed-off-by: Henrik Rydberg <rydberg at euromail.se>
---
hald/linux/addons/Makefile.am | 4 +
hald/linux/addons/addon-generic-kbd-backlight.c | 248 +++++++++++++++++++++++
2 files changed, 252 insertions(+), 0 deletions(-)
create mode 100644 hald/linux/addons/addon-generic-kbd-backlight.c
diff --git a/hald/linux/addons/Makefile.am b/hald/linux/addons/Makefile.am
index 46b41cf..adf4554 100644
--- a/hald/linux/addons/Makefile.am
+++ b/hald/linux/addons/Makefile.am
@@ -11,6 +11,7 @@ AM_CPPFLAGS = \
if HALD_COMPILE_LINUX
libexec_PROGRAMS = \
hald-addon-generic-backlight \
+ hald-addon-generic-kbd-backlight\
hald-addon-hid-ups \
hald-addon-input \
hald-addon-ipw-killswitch \
@@ -98,6 +99,9 @@ hald_addon_storage_LDADD = $(top_builddir)/libhal/libhal.la @GLIB_LIBS@
hald_addon_generic_backlight_SOURCES = addon-generic-backlight.c ../../logger.c ../../util_helper.c ../../util_helper_priv.c
hald_addon_generic_backlight_LDADD = $(top_builddir)/libhal/libhal.la @GLIB_LIBS@
+hald_addon_generic_kbd_backlight_SOURCES = addon-generic-kbd-backlight.c ../../logger.c ../../util_helper.c ../../util_helper_priv.c
+hald_addon_generic_kbd_backlight_LDADD = $(top_builddir)/libhal/libhal.la @GLIB_LIBS@
+
hald_addon_ipw_killswitch_SOURCES = addon-ipw-killswitch.c ../../logger.c ../../util_helper.c ../../util_helper_priv.c
hald_addon_ipw_killswitch_LDADD = $(top_builddir)/libhal/libhal.la @GLIB_LIBS@
diff --git a/hald/linux/addons/addon-generic-kbd-backlight.c b/hald/linux/addons/addon-generic-kbd-backlight.c
new file mode 100644
index 0000000..525e700
--- /dev/null
+++ b/hald/linux/addons/addon-generic-kbd-backlight.c
@@ -0,0 +1,248 @@
+/***************************************************************************
+ *
+ * addon-generic-kbd-backlight.c:
+ * Copyright (C) 2008 Henrik Rydberg <rydberg at euromail.se>
+ *
+ * Based on addon-generic-backlight.c:
+ * Copyright (C) 2008 Danny Kukawka <danny.kukawka at web.de>
+ *
+ * Licensed under the Academic Free License version 2.1
+ *
+ * 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 St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ **************************************************************************/
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+#include <glib/gmain.h>
+#include <dbus/dbus-glib.h>
+#include <dbus/dbus-glib-lowlevel.h>
+
+#include "libhal/libhal.h"
+#include "../../logger.h"
+#include "../../util_helper.h"
+#include "../../util_helper_priv.h"
+
+#define HAL_PROPERTY "org.freedesktop.Hal.Device.KeyboardBacklight"
+
+static const char prop_name[] = HAL_PROPERTY;
+static const char prop_invalid[] = HAL_PROPERTY ".Invalid";
+static const char prop_set[] = "SetBrightness";
+static const char prop_get[] = "GetBrightness";
+
+static GMainLoop *main_loop;
+static LibHalContext *halctx;
+static DBusConnection *conn;
+
+static char sysfs_path[512];
+static int levels;
+
+/**
+ * Get keyboard backlight level
+ *
+ * Tries to read from the specified sysfs device, and if successful,
+ * updates the internal keyboard backlight state. Warns if the device
+ * cannot be opened or be read from. Always returns the last succesful
+ * read.
+ */
+static int get_kbd_backlight()
+{
+ static int level;
+ int fd;
+ char buf[64];
+
+ fd = open(sysfs_path, O_RDONLY);
+ if (fd < 0) {
+ HAL_WARNING(("Could not open '%s'", sysfs_path));
+ return level;
+ }
+
+ memset(buf, 0, sizeof(buf));
+ if (read(fd, buf, sizeof(buf)) < 0)
+ HAL_WARNING(("Could not read from '%s'", sysfs_path));
+ else
+ level = atoi(buf);
+
+ close(fd);
+ return level;
+}
+
+/**
+ * Set keyboard backlight level
+ *
+ * Warns if the device cannot be opened or be written to.
+ * Returns bytes written on success, negative value on failure.
+ */
+static int set_kbd_backlight(int level)
+{
+ int fd, ret;
+ char buf[64];
+
+ sprintf(buf, "%d", level);
+
+ fd = open(sysfs_path, O_WRONLY);
+ if (fd < 0) {
+ HAL_WARNING(("Could not open '%s'", sysfs_path));
+ return -1;
+ }
+
+ ret = write(fd, buf, strlen(buf));
+ if (ret < 0)
+ HAL_WARNING(("Could not write '%s' to '%s'", buf, sysfs_path));
+
+ close(fd);
+ return ret;
+}
+
+/* DBus set keyboard backlight level */
+static DBusMessage *dbus_get_kbd_backlight(DBusMessage *msg)
+{
+ DBusError err;
+ DBusMessage *reply;
+ int level;
+
+ dbus_error_init(&err);
+ if (!dbus_message_get_args(msg, &err, DBUS_TYPE_INVALID))
+ return dbus_message_new_error(msg, prop_invalid,
+ "Invalid message");
+
+ level = get_kbd_backlight();
+
+ reply = dbus_message_new_method_return(msg);
+ if (reply)
+ dbus_message_append_args(reply, DBUS_TYPE_INT32, &level,
+ DBUS_TYPE_INVALID);
+
+ return reply;
+}
+
+/* DBus set keyboard backlight level */
+static DBusMessage *dbus_set_kbd_backlight(DBusMessage *msg)
+{
+ DBusError err;
+ int level;
+
+ dbus_error_init(&err);
+ if (!dbus_message_get_args(msg, &err, DBUS_TYPE_INT32, &level,
+ DBUS_TYPE_INVALID))
+ return dbus_message_new_error(msg, prop_invalid,
+ "Brightness level argument missing");
+
+ if (level < 0 || level > levels - 1)
+ return dbus_message_new_error(msg, prop_invalid,
+ "Brightness level is invalid");
+
+ set_kbd_backlight(level);
+
+ return dbus_message_new_method_return(msg);
+}
+
+/* DBus filter function */
+static DBusHandlerResult filter_function(DBusConnection *connection,
+ DBusMessage *message,
+ void *userdata)
+{
+ DBusMessage *reply = NULL;
+
+ if (dbus_message_is_method_call(message, prop_name, prop_get))
+ reply = dbus_get_kbd_backlight(message);
+ else if (dbus_message_is_method_call(message, prop_name, prop_set))
+ reply = dbus_set_kbd_backlight(message);
+
+ if (reply) {
+ dbus_connection_send(connection, reply, NULL);
+ dbus_message_unref(reply);
+ }
+
+ return DBUS_HANDLER_RESULT_HANDLED;
+}
+
+int main(int argc, char *argv[])
+{
+ DBusError err;
+ struct stat fs;
+
+ char *udi = getenv("UDI");
+ char *path = getenv("HAL_PROP_LINUX_SYSFS_PATH");
+ char *level_str = getenv("HAL_PROP_KEYBOARD_BACKLIGHT_NUM_LEVELS");
+
+ setup_logger();
+
+ if (udi == NULL) {
+ HAL_ERROR(("No device specified"));
+ return -2;
+ }
+ if (path == NULL) {
+ HAL_ERROR(("No sysfs path specified"));
+ return -2;
+ }
+ if (level_str == NULL) {
+ HAL_ERROR(("No keyboard_backlight.num_levels defined"));
+ return -2;
+ }
+
+ levels = atoi(level_str);
+ snprintf(sysfs_path, sizeof(sysfs_path), "%s/brightness", path);
+
+ HAL_DEBUG(("udi='%s', path='%s', levels='%d'", udi, path, levels));
+
+ if (stat(sysfs_path, &fs)) {
+ HAL_ERROR(("The sysfs property path does not exist"));
+ return -2;
+ }
+
+ dbus_error_init(&err);
+ halctx = libhal_ctx_init_direct(&err);
+
+ if (halctx == NULL) {
+ HAL_ERROR(("Cannot connect to hald"));
+ return -3;
+ }
+
+ conn = libhal_ctx_get_dbus_connection(halctx);
+ dbus_connection_setup_with_g_main(conn, NULL);
+
+ dbus_connection_add_filter(conn, filter_function, NULL, NULL);
+
+ if (!libhal_device_claim_interface(halctx, udi, prop_name,
+ " <method name=\"GetBrightness\">\n"
+ " <arg name=\"brightness_value\" direction=\"out\" type=\"i\"/>\n"
+ " </method>\n"
+ " <method name=\"SetBrightness\">\n"
+ " <arg name=\"brightness_value\" direction=\"in\" type=\"i\"/>\n"
+ " </method>\n",
+ &err)) {
+ HAL_ERROR(("Cannot claim interface '" HAL_PROPERTY "'"));
+ return -4;
+ }
+
+ dbus_error_init(&err);
+ if (!libhal_device_addon_is_ready(halctx, udi, &err))
+ return -4;
+
+ main_loop = g_main_loop_new(NULL, FALSE);
+ g_main_loop_run(main_loop);
+
+ return 0;
+}
+
--
1.5.6.3
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