| qwerty12 |
2010-05-26 13:53 |
Re: Getting Screen State to Save Power
Quote:
Originally Posted by jarmniku
(Post 679091)
Fine, is there also a way to detect when power charger is plugged/unplugged?
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PHP Code:
/* gcc pimp.c `pkg-config --cflags --libs glib-2.0 libosso hal` -Wall */
#include <stdlib.h>
#include <glib.h>
#include <glib/gprintf.h>
#include <libosso.h>
#include <libhal.h>
/* Subject to change. */
#define BME_UDI "/org/freedesktop/Hal/devices/bme"
#define CONNECTION_STATUS_PROP "maemo.charger.connection_status"
#define CHARGER_CONNECTED "connected"
static GMainLoop *loop = NULL;
static osso_context_t *osso_ctx = NULL;
static LibHalContext *hal_ctx = NULL;
static gboolean connected_to_charger = FALSE;
static void sig_handler (int sig G_GNUC_UNUSED)
{
if (loop != NULL && g_main_loop_is_running (loop))
g_main_loop_quit (loop);
}
static inline gint print_is_connected (void)
{
return g_printf ("%s\n", connected_to_charger ? "On charger" : "Not on charger");
}
static void set_connected_to_charger (char *value)
{
g_return_if_fail (value);
connected_to_charger = g_str_equal (value, CHARGER_CONNECTED);
libhal_free_string (value);
(void) print_is_connected ();
}
static void on_property_modified (LibHalContext *ctx, const char *udi, const char *key, dbus_bool_t is_removed G_GNUC_UNUSED, dbus_bool_t is_added G_GNUC_UNUSED)
{
if (!g_str_equal (udi, BME_UDI) || !g_str_equal (key, CONNECTION_STATUS_PROP))
return;
set_connected_to_charger (libhal_device_get_property_string (hal_ctx, BME_UDI, CONNECTION_STATUS_PROP, NULL));
}
int main (void)
{
loop = g_main_loop_new (NULL, FALSE);
signal (SIGINT, sig_handler);
signal (SIGQUIT, sig_handler);
signal (SIGTERM, sig_handler);
osso_ctx = osso_initialize ("charger_test", "666", FALSE, NULL);
hal_ctx = libhal_ctx_new ();
libhal_ctx_set_dbus_connection (hal_ctx, (DBusConnection*) osso_get_sys_dbus_connection (osso_ctx));
libhal_ctx_init (hal_ctx, NULL);
/* Get initial state */
set_connected_to_charger (libhal_device_get_property_string (hal_ctx, BME_UDI, CONNECTION_STATUS_PROP, NULL));
/* Watch for changes */
libhal_ctx_set_device_property_modified (hal_ctx, on_property_modified);
libhal_device_add_property_watch (hal_ctx, BME_UDI, NULL);
g_main_loop_run (loop);
g_main_loop_unref (loop);
libhal_device_remove_property_watch (hal_ctx, BME_UDI, NULL);
libhal_ctx_shutdown (hal_ctx, NULL);
libhal_ctx_free (hal_ctx);
osso_deinitialize (osso_ctx);
return EXIT_SUCCESS;
}
Since there is no official way (AFAIK), here's an unofficial way. Make sure to add error checks and, as I deal in DBus-Glib and not libdbus directly...
Oh, I guess I was on the right lines.
Here's a snippet from dbus.cc, found in hildon-application-manager:
PHP Code:
bool
enough_battery_p (void)
{
LibHalContext *hal;
int i;
char **devs;
int n_devs;
hal = libhal_ctx_new ();
libhal_ctx_set_dbus_connection (hal, dbus_bus_get (DBUS_BUS_SYSTEM, NULL));
devs = libhal_find_device_by_capability (hal, "battery", &n_devs, NULL);
if (devs)
{
for (i = 0; i < n_devs; i++)
{
DBusError error;
dbus_error_init (&error);
dbus_bool_t charging = libhal_device_get_property_bool
(hal, devs[i], "battery.rechargeable.is_charging", &error);
if (dbus_error_is_set (&error))
dbus_error_free (&error);
else
{
if (charging)
break;
}
dbus_error_init (&error);
dbus_int32_t percentage = libhal_device_get_property_int
(hal, devs[i], "battery.charge_level.percentage", &error);
if (dbus_error_is_set (&error))
{
dbus_error_free (&error);
break;
}
else
{
if (percentage > 50)
break;
}
}
}
libhal_ctx_shutdown (hal, NULL);
return devs == NULL || i < n_devs;
}
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