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/*
* Copyright (C) 2007 Richard Hughes <richard@hughsie.com>
*
* Licensed under the GNU Lesser General Public License Version 2
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <gmodule.h>
#include <glib.h>
#include <ohm-plugin.h>
#include <dbus/dbus-glib.h>
#define HAL_DBUS_SERVICE "org.freedesktop.Hal"
#define HAL_DBUS_INTERFACE_LAPTOP_PANEL "org.freedesktop.Hal.Device.LaptopPanel"
enum {
CONF_BRIGHTNESS_PERCENT_CHANGED,
CONF_BRIGHTNESS_HARDWARE_CHANGED,
CONF_LAST
};
typedef struct {
gint levels;
} OhmPluginCacheData;
static OhmPluginCacheData data;
static gboolean
backlight_set_brightness (OhmPlugin *plugin, guint brightness)
{
DBusGConnection *connection;
DBusGProxy *proxy;
GError *error;
gboolean ret;
gint retval;
gchar *udi;
/* get udi and connection, assume connected */
udi = ohm_plugin_hal_get_udi (plugin, 0);
if (udi == NULL) {
g_warning ("cannot set brightness as no device!");
return FALSE;
}
connection = dbus_g_bus_get (DBUS_BUS_SYSTEM, NULL);
/* reuse the connection from HAL */
proxy = dbus_g_proxy_new_for_name (connection,
HAL_DBUS_SERVICE, udi,
HAL_DBUS_INTERFACE_LAPTOP_PANEL);
g_debug ("%s: Calling " HAL_DBUS_INTERFACE_LAPTOP_PANEL ".SetBrightness %d", G_STRFUNC, brightness);
/* get the brightness from HAL */
error = NULL;
ret = dbus_g_proxy_call (proxy, "SetBrightness", &error,
G_TYPE_INT, (int)brightness,
G_TYPE_INVALID,
G_TYPE_UINT, &retval,
G_TYPE_INVALID);
if (error != NULL) {
g_printerr ("Error: %s\n", error->message);
g_error_free (error);
}
g_object_unref (proxy);
g_free (udi);
return ret;
}
#if 0
static gboolean
backlight_get_brightness (OhmPlugin *plugin, guint *brightness)
{
DBusConnection *connection;
DBusGProxy *proxy;
GError *error;
gboolean ret;
int level = 0;
/* reuse the connection from HAL */
connection = libhal_ctx_get_dbus_connection (ctx);
proxy = dbus_g_proxy_new_for_name (connection, HAL_DBUS_SERVICE, udi, HAL_DBUS_INTERFACE_LAPTOP_PANEL);
if (udi == NULL) {
g_warning ("cannot get brightness as no device!");
return FALSE;
}
/* get the brightness from HAL */
error = NULL;
ret = dbus_g_proxy_call (proxy, "GetBrightness", &error,
G_TYPE_INVALID,
G_TYPE_UINT, &level,
G_TYPE_INVALID);
if (error != NULL) {
g_printerr ("Error: %s\n", error->message);
g_error_free (error);
level = 0;
}
*brightness = level;
g_object_unref (proxy);
return ret;
}
#endif
static guint
percent_to_discrete (guint percentage,
guint levels)
{
/* check we are in range */
if (percentage > 100) {
return levels;
}
if (levels == 0) {
g_warning ("levels is 0!");
return 0;
}
return ((gfloat) percentage * (gfloat) (levels - 1)) / 100.0f;
}
/**
* plugin_initalize:
* @plugin: This class instance
*
* Coldplug, i.e. read and set the initial state of the plugin.
* We can assume all the required modules have been loaded, although it's
* dangerous to assume the key values are anything other than the defaults.
*/
static void
plugin_initalize (OhmPlugin *plugin)
{
guint num;
/* interested keys, either can be changed without changing the other */
/* initalize HAL */
ohm_plugin_hal_init (plugin);
/* get the only device with capability and watch it */
num = ohm_plugin_hal_add_device_capability (plugin, "laptop_panel");
g_debug ("%s: Got %d devices with laptop_panel capability", G_STRFUNC, num);
if (num > 1) {
g_warning ("not tested with not one laptop_panel");
}
if (num != 0) {
/* get levels that the adapter supports -- this does not change ever */
ohm_plugin_hal_get_int (plugin, 0, "laptop_panel.num_levels", &data.levels);
g_debug ("%s: data.levels = %d", G_STRFUNC, data.levels);
if (data.levels == 0) {
g_error ("levels zero!");
return;
}
ohm_plugin_conf_set_key (plugin, "backlight.num_levels", data.levels);
}
}
/**
* plugin_notify:
* @plugin: This class instance
*
* Notify the plugin that a key marked with ohm_plugin_conf_interested ()
* has it's value changed.
* An enumerated numeric id rather than the key is returned for processing speed.
*/
static void
plugin_notify (OhmPlugin *plugin, gint id, gint value)
{
guint hw;
if (id == CONF_BRIGHTNESS_PERCENT_CHANGED) {
hw = percent_to_discrete (value, data.levels);
ohm_plugin_conf_set_key (plugin, "backlight.hardware_brightness", hw);
// backlight_set_brightness (plugin, hw); ------ SHOULDN'T BE NEEDED
} else if (id == CONF_BRIGHTNESS_HARDWARE_CHANGED) {
backlight_set_brightness (plugin, value);
}
}
OHM_PLUGIN_DESCRIPTION (
"OHM Backlight",
"0.0.2",
"richard@hughsie.com",
OHM_LICENSE_LGPL,
plugin_initalize,
NULL,
plugin_notify);
OHM_PLUGIN_INTERESTED (
{"backlight.hardware_brightness", CONF_BRIGHTNESS_HARDWARE_CHANGED},
{"backlight.percent_brightness", CONF_BRIGHTNESS_PERCENT_CHANGED});
OHM_PLUGIN_PROVIDES (
"backlight.state",
"backlight.hardware_brightness",
"backlight.percent_brightness",
"backlight.num_levels");
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