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Diffstat (limited to 'src/services/brightness-service.c')
| -rw-r--r-- | src/services/brightness-service.c | 391 |
1 files changed, 0 insertions, 391 deletions
diff --git a/src/services/brightness-service.c b/src/services/brightness-service.c deleted file mode 100644 index 32f0501..0000000 --- a/src/services/brightness-service.c +++ /dev/null @@ -1,391 +0,0 @@ -#include "services/brightness-service.h" -#include <gio/gio.h> -#include <math.h> - -// -// FoobarBrightnessService: -// -// Service managing the brightness level. This is implemented by -// - for read access: monitoring the "brightness" file in a "/sys/class/backlight" subdirectory, -// - for write access: invoking the "brightnessctl" command. -// - -struct _FoobarBrightnessService -{ - GObject parent_instance; - gint percentage; - GFileMonitor* file_monitor; - gulong file_monitor_handler_id; - gchar* device_name; - gchar* file_path; - gint max_brightness; -}; - -enum -{ - PROP_PERCENTAGE = 1, - N_PROPS, -}; - -static GParamSpec* props[N_PROPS] = { 0 }; - -static void foobar_brightness_service_class_init ( FoobarBrightnessServiceClass* klass ); -static void foobar_brightness_service_init ( FoobarBrightnessService* self ); -static void foobar_brightness_service_get_property ( GObject* object, - guint prop_id, - GValue* value, - GParamSpec* pspec ); -static void foobar_brightness_service_set_property ( GObject* object, - guint prop_id, - GValue const* value, - GParamSpec* pspec ); -static void foobar_brightness_service_finalize ( GObject* object ); -static void foobar_brightness_service_handle_changed ( GFileMonitor* monitor, - GFile* file, - GFile* other_file, - GFileMonitorEvent event_type, - gpointer userdata ); -static gint foobar_brightness_service_load_percentage ( FoobarBrightnessService* self ); -static void foobar_brightness_service_write_percentage ( FoobarBrightnessService* self ); -static void foobar_brightness_service_write_percentage_watch_cb( GPid pid, - gint status, - gpointer userdata ); -static void foobar_brightness_service_get_info ( gchar** out_device_name, - gchar** out_file_path, - gint* out_max_brightness ); -static gint foobar_brightness_service_read_value ( gchar const* path ); -static GFileMonitor* foobar_brightness_service_monitor ( gchar const* path ); - -G_DEFINE_FINAL_TYPE( FoobarBrightnessService, foobar_brightness_service, G_TYPE_OBJECT ) - -// --------------------------------------------------------------------------------------------------------------------- -// Service Implementation -// --------------------------------------------------------------------------------------------------------------------- - -// -// Static initialization for the brightness service. -// -void foobar_brightness_service_class_init( FoobarBrightnessServiceClass* klass ) -{ - GObjectClass* object_klass = G_OBJECT_CLASS( klass ); - object_klass->get_property = foobar_brightness_service_get_property; - object_klass->set_property = foobar_brightness_service_set_property; - object_klass->finalize = foobar_brightness_service_finalize; - - props[PROP_PERCENTAGE] = g_param_spec_int( - "percentage", - "Percentage", - "Current brightness percentage.", - 0, - 100, - 100, - G_PARAM_READWRITE ); - g_object_class_install_properties( object_klass, N_PROPS, props ); -} - -// -// Instance initialization for the brightness service. -// -void foobar_brightness_service_init( FoobarBrightnessService* self ) -{ - foobar_brightness_service_get_info( &self->device_name, &self->file_path, &self->max_brightness ); - self->percentage = foobar_brightness_service_load_percentage( self ); - if ( self->file_path ) - { - self->file_monitor = foobar_brightness_service_monitor( self->file_path ); - } - if ( self->file_monitor ) - { - self->file_monitor_handler_id = g_signal_connect( - self->file_monitor, - "changed", - G_CALLBACK( foobar_brightness_service_handle_changed ), - self ); - } - else - { - self->file_monitor_handler_id = 0; - } -} - -// -// Property getter implementation, mapping a property id to a method. -// -void foobar_brightness_service_get_property( - GObject* object, - guint prop_id, - GValue* value, - GParamSpec* pspec ) -{ - FoobarBrightnessService* self = (FoobarBrightnessService*)object; - - switch ( prop_id ) - { - case PROP_PERCENTAGE: - g_value_set_int( value, foobar_brightness_service_get_percentage( self ) ); - break; - default: - G_OBJECT_WARN_INVALID_PROPERTY_ID( object, prop_id, pspec ); - break; - } -} - -// -// Property setter implementation, mapping a property id to a method. -// -void foobar_brightness_service_set_property( - GObject* object, - guint prop_id, - GValue const* value, - GParamSpec* pspec ) -{ - FoobarBrightnessService* self = (FoobarBrightnessService*)object; - - switch ( prop_id ) - { - case PROP_PERCENTAGE: - foobar_brightness_service_set_percentage( self, g_value_get_int( value ) ); - break; - default: - G_OBJECT_WARN_INVALID_PROPERTY_ID( object, prop_id, pspec ); - break; - } -} - -// -// Instance cleanup for the brightness service. -// -void foobar_brightness_service_finalize( GObject* object ) -{ - FoobarBrightnessService* self = (FoobarBrightnessService*)object; - - g_clear_signal_handler( &self->file_monitor_handler_id, self->file_monitor ); - g_clear_object( &self->file_monitor ); - g_clear_pointer( &self->device_name, g_free ); - g_clear_pointer( &self->file_path, g_free ); - - G_OBJECT_CLASS( foobar_brightness_service_parent_class )->finalize( object ); -} - -// --------------------------------------------------------------------------------------------------------------------- -// Public API -// --------------------------------------------------------------------------------------------------------------------- - -// -// Create a new brightness service instance. -// -FoobarBrightnessService* foobar_brightness_service_new( void ) -{ - return g_object_new( FOOBAR_TYPE_BRIGHTNESS_SERVICE, NULL ); -} - -// -// Get the current brightness percentage value. -// -gint foobar_brightness_service_get_percentage( FoobarBrightnessService* self ) -{ - g_return_val_if_fail( FOOBAR_IS_BRIGHTNESS_SERVICE( self ), 0 ); - - return self->percentage; -} - -// -// Update the current brightness percentage value. -// -void foobar_brightness_service_set_percentage( - FoobarBrightnessService* self, - gint value ) -{ - g_return_if_fail( FOOBAR_IS_BRIGHTNESS_SERVICE( self ) ); - - value = CLAMP( value, 0, 100 ); - if ( self->percentage != value ) - { - self->percentage = value; - g_object_notify_by_pspec( G_OBJECT( self ), props[PROP_PERCENTAGE] ); - foobar_brightness_service_write_percentage( self ); - } -} - -// --------------------------------------------------------------------------------------------------------------------- -// Signal Handlers -// --------------------------------------------------------------------------------------------------------------------- - -// -// Called by the file monitor when the contents of the "brightness" file have changed. -// -void foobar_brightness_service_handle_changed( - GFileMonitor* monitor, - GFile* file, - GFile* other_file, - GFileMonitorEvent event_type, - gpointer userdata ) -{ - (void)monitor; - (void)file; - (void)other_file; - (void)event_type; - FoobarBrightnessService* self = (FoobarBrightnessService*)userdata; - - gint new_percentage = foobar_brightness_service_load_percentage( self ); - if ( self->percentage != new_percentage ) - { - self->percentage = new_percentage; - g_object_notify_by_pspec( G_OBJECT( self ), props[PROP_PERCENTAGE] ); - } -} - -// --------------------------------------------------------------------------------------------------------------------- -// Helper Methods -// --------------------------------------------------------------------------------------------------------------------- - -// -// Load the current percentage value from the file at self->file_path. -// -// This requires file_path and max_brightness to be initialized, otherwise the brightness is assumed to be 100%. -// -gint foobar_brightness_service_load_percentage( FoobarBrightnessService* self ) -{ - if ( !self->file_path || self->max_brightness == -1 ) { return 100; } - - gint value = foobar_brightness_service_read_value( self->file_path ); - if ( value == -1 ) { return 100; } - - gdouble rel = value / (gdouble)self->max_brightness; - gint percentage = (gint)round( rel * 100. ); - return CLAMP( percentage, 0, 100 ); -} - -// -// Asynchronously update the current percentage value by invoking brightnessctl. -// -// This requires device_name to be initialized. -// -void foobar_brightness_service_write_percentage( FoobarBrightnessService* self ) -{ - if ( !self->device_name ) { return; } - - g_autofree gchar* percentage_string = g_strdup_printf( "%d%%", self->percentage ); - gchar* args[] = { "brightnessctl", "-d", self->device_name, "s", percentage_string, NULL }; - - g_autoptr( GError ) error = NULL; - GPid child_pid; - if ( !g_spawn_async( - NULL, - args, - NULL, - G_SPAWN_DO_NOT_REAP_CHILD - | G_SPAWN_SEARCH_PATH - | G_SPAWN_STDIN_FROM_DEV_NULL - | G_SPAWN_STDOUT_TO_DEV_NULL - | G_SPAWN_STDERR_TO_DEV_NULL, - NULL, - NULL, - &child_pid, - &error ) ) - { - g_warning( "Unable to spawn brightnessctl: %s", error->message ); - return; - } - - g_child_watch_add( child_pid, foobar_brightness_service_write_percentage_watch_cb, NULL ); -} - -// -// Called when the brightnessctl child process has finished. -// -void foobar_brightness_service_write_percentage_watch_cb( - GPid pid, - gint status, - gpointer userdata ) -{ - (void)userdata; - - g_autoptr( GError ) error = NULL; - if ( !g_spawn_check_wait_status( status, &error ) ) - { - g_warning( "Unable to set brightness with brightnessctl: %s", error->message ); - } - - g_spawn_close_pid( pid ); -} - -// -// Initialize information for the brightness device. -// -// This looks for the first directory in the /sys/class/backlight directories and uses it as the device name. It also -// populates out_file_path to the path of this directory and out_max_brightness to the contents of the corresponding -// max_brightness file. -// -void foobar_brightness_service_get_info( - gchar** out_device_name, - gchar** out_file_path, - gint* out_max_brightness ) -{ - *out_device_name = NULL; - *out_file_path = NULL; - *out_max_brightness = -1; - - g_autoptr( GFile ) dir = g_file_new_for_path( "/sys/class/backlight" ); - if ( !dir ) { return; } - - g_autoptr( GFileEnumerator ) enumerator = g_file_enumerate_children( - dir, - "standard::", - G_FILE_QUERY_INFO_NONE, - NULL, - NULL ); - if ( !enumerator ) { return; } - - g_autoptr( GFileInfo ) info = g_file_enumerator_next_file( enumerator, NULL, NULL ); - g_file_enumerator_close( enumerator, NULL, NULL ); - if ( !info ) { return; } - - gchar* device_name = g_strdup( g_file_info_get_name( info ) ); - gchar* current_file_path = g_strdup_printf( "/sys/class/backlight/%s/brightness", device_name ); - gchar* max_file_path = g_strdup_printf( "/sys/class/backlight/%s/max_brightness", device_name ); - *out_device_name = device_name; - *out_file_path = current_file_path; - *out_max_brightness = foobar_brightness_service_read_value( max_file_path ); - g_free( max_file_path ); -} - -// -// Read the current brightness integer (not percentage) from the given file path. -// -gint foobar_brightness_service_read_value( gchar const* path ) -{ - g_autofree gchar* contents = NULL; - g_autoptr( GError ) error = NULL; - if ( !g_file_get_contents( path, &contents, NULL, &error ) ) - { - g_warning( "Unable to read %s: %s", path, error->message ); - return -1; - } - - errno = 0; - char* endptr; - long result = strtol( contents, &endptr, 10 ); - if ( errno != 0 || endptr == contents || result > INT_MAX || result < 0 ) - { - g_warning( "Expected integer in %s, but got: %s", path, contents ); - return -1; - } - - return (gint)result; -} - -// -// Set up a file monitor for the given path. -// -GFileMonitor* foobar_brightness_service_monitor( gchar const* path ) -{ - g_autoptr( GFile ) file = g_file_new_for_path( path ); - if ( !file ) { return NULL; } - - g_autoptr( GError ) error = NULL; - GFileMonitor* monitor = g_file_monitor_file( file, G_FILE_MONITOR_NONE, NULL, &error ); - if ( !monitor ) { g_warning( "Unable to monitor brightness: %s", error->message ); } - - return monitor; -} |