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/***************************************************************************
*
* addon-generic-kbd-backlight.c:
* Copyright (C) 2008 Henrik Rydberg <rydberg@euromail.se>
*
* Based on addon-generic-backlight.c:
* Copyright (C) 2008 Danny Kukawka <danny.kukawka@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
*
**************************************************************************/
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include "glib-abi.h"
#include "dbus-abi.h"
#include "hal-abi.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 struct GMainLoop *main_loop;
static struct LibHalContext *halctx;
static struct 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 struct DBusMessage *dbus_get_kbd_backlight(struct DBusMessage *msg)
{
struct DBusError err;
struct 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 struct DBusMessage *dbus_set_kbd_backlight(struct DBusMessage *msg)
{
struct 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(struct DBusConnection *connection,
struct DBusMessage *message,
void *userdata)
{
struct 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[])
{
struct 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;
}
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