1 files changed, 227 insertions, 0 deletions
diff --git a/backends/alsa/alsa-switch.c b/backends/alsa/alsa-switch.c
new file mode 100644
index 0000000..15151ae
--- /dev/null
+++ b/backends/alsa/alsa-switch.c
@@ -0,0 +1,227 @@
+/*
+ * Copyright (C) 2014 Michal Ratajsky <[email protected]>
+ *
+ * This library 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 of the licence, or (at your option) any later version.
+ *
+ * This library 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <glib.h>
+#include <glib-object.h>
+#include <alsa/asoundlib.h>
+
+#include <libmatemixer/matemixer.h>
+#include <libmatemixer/matemixer-private.h>
+
+#include "alsa-element.h"
+#include "alsa-switch.h"
+#include "alsa-switch-option.h"
+
+struct _AlsaSwitchPrivate
+{
+ GList *options;
+ guint32 channel_mask;
+ snd_mixer_elem_t *element;
+};
+
+static void alsa_element_interface_init (AlsaElementInterface *iface);
+
+static void alsa_switch_class_init (AlsaSwitchClass *klass);
+static void alsa_switch_init (AlsaSwitch *swtch);
+
+G_DEFINE_TYPE_WITH_CODE (AlsaSwitch, alsa_switch,
+ MATE_MIXER_TYPE_SWITCH,
+ G_IMPLEMENT_INTERFACE (ALSA_TYPE_ELEMENT,
+ alsa_element_interface_init))
+
+static gboolean alsa_switch_set_active_option (MateMixerSwitch *mms,
+ MateMixerSwitchOption *mmso);
+
+static GList * alsa_switch_list_options (MateMixerSwitch *mms);
+
+static snd_mixer_elem_t * alsa_switch_get_snd_element (AlsaElement *element);
+static void alsa_switch_set_snd_element (AlsaElement *element,
+ snd_mixer_elem_t *el);
+static gboolean alsa_switch_load (AlsaElement *element);
+
+static void
+alsa_element_interface_init (AlsaElementInterface *iface)
+{
+ iface->get_snd_element = alsa_switch_get_snd_element;
+ iface->set_snd_element = alsa_switch_set_snd_element;
+ iface->load = alsa_switch_load;
+}
+
+static void
+alsa_switch_class_init (AlsaSwitchClass *klass)
+{
+ MateMixerSwitchClass *switch_class;
+
+ switch_class = MATE_MIXER_SWITCH_CLASS (klass);
+ switch_class->set_active_option = alsa_switch_set_active_option;
+ switch_class->list_options = alsa_switch_list_options;
+
+ g_type_class_add_private (G_OBJECT_CLASS (klass), sizeof (AlsaSwitchPrivate));
+}
+
+static void
+alsa_switch_init (AlsaSwitch *swtch)
+{
+ swtch->priv = G_TYPE_INSTANCE_GET_PRIVATE (swtch,
+ ALSA_TYPE_SWITCH,
+ AlsaSwitchPrivate);
+}
+
+AlsaSwitch *
+alsa_switch_new (const gchar *name, const gchar *label, GList *options)
+{
+ AlsaSwitch *swtch;
+
+ swtch = g_object_new (ALSA_TYPE_SWITCH,
+ "name", name,
+ "label", label,
+ NULL);
+
+ /* Takes ownership of options */
+ swtch->priv->options = options;
+ return swtch;
+}
+
+static gboolean
+alsa_switch_set_active_option (MateMixerSwitch *mms, MateMixerSwitchOption *mmso)
+{
+ AlsaSwitch *swtch;
+ guint index;
+ gboolean set_item = FALSE;
+ snd_mixer_selem_channel_id_t channel;
+
+ g_return_val_if_fail (ALSA_IS_SWITCH (mms), FALSE);
+ g_return_val_if_fail (ALSA_IS_SWITCH_OPTION (mmso), FALSE);
+
+ swtch = ALSA_SWITCH (mms);
+
+ /* The channel mask is created when reading the active option the first
+ * time, so a successful load must be done before changing the option */
+ if G_UNLIKELY (swtch->priv->channel_mask == 0) {
+ g_debug ("Not setting active switch option, channel mask unknown");
+ return FALSE;
+ }
+
+ index = alsa_switch_option_get_id (ALSA_SWITCH_OPTION (mmso));
+
+ for (channel = 0; channel < SND_MIXER_SCHN_LAST; channel++) {
+ /* The option is set per-channel, make sure to set it only for channels
+ * we successfully read the value from */
+ if (swtch->priv->channel_mask & (1 << channel)) {
+ gint ret = snd_mixer_selem_set_enum_item (swtch->priv->element,
+ channel,
+ index);
+ if (ret == 0)
+ set_item = TRUE;
+ else
+ g_warning ("Failed to set active option of switch %s: %s",
+ snd_mixer_selem_get_name (swtch->priv->element),
+ snd_strerror (ret));
+ }
+ }
+ return set_item;
+}
+
+static GList *
+alsa_switch_list_options (MateMixerSwitch *swtch)
+{
+ g_return_val_if_fail (ALSA_IS_SWITCH (swtch), NULL);
+
+ return ALSA_SWITCH (swtch)->priv->options;
+}
+
+static snd_mixer_elem_t *
+alsa_switch_get_snd_element (AlsaElement *element)
+{
+ g_return_val_if_fail (ALSA_IS_SWITCH (element), NULL);
+
+ return ALSA_SWITCH (element)->priv->element;
+}
+
+static void
+alsa_switch_set_snd_element (AlsaElement *element, snd_mixer_elem_t *el)
+{
+ g_return_if_fail (ALSA_IS_SWITCH (element));
+ g_return_if_fail (el != NULL);
+
+ ALSA_SWITCH (element)->priv->element = el;
+}
+
+static gboolean
+alsa_switch_load (AlsaElement *element)
+{
+ AlsaSwitch *swtch;
+ GList *list;
+ guint item;
+ gint ret;
+ snd_mixer_selem_channel_id_t c;
+
+ swtch = ALSA_SWITCH (element);
+
+ /* When reading the first time we try all the channels, otherwise only the
+ * ones which returned success before */
+ if (swtch->priv->channel_mask == 0) {
+ for (c = 0; c < SND_MIXER_SCHN_LAST; c++) {
+ ret = snd_mixer_selem_get_enum_item (swtch->priv->element, c, &item);
+
+ /* The active enum option is set per-channel, so when reading it the
+ * first time, create a mask of all channels for which we read the
+ * value successfully */
+ if (ret == 0)
+ swtch->priv->channel_mask |= 1 << c;
+ }
+
+ /* The last ALSA call might have failed, but it doesn't matter if we have
+ * a channel mask */
+ if (swtch->priv->channel_mask > 0)
+ ret = 0;
+ } else {
+ for (c = 0; !(swtch->priv->channel_mask & (1 << c)); c++)
+ ;
+
+ /* When not reading the mask, the first usable channel is enough, we don't
+ * support per-channel selections anyway */
+ ret = snd_mixer_selem_get_enum_item (swtch->priv->element, c, &item);
+ }
+
+ if (ret < 0) {
+ g_warning ("Failed to read active option of switch %s: %s",
+ snd_mixer_selem_get_name (swtch->priv->element),
+ snd_strerror (ret));
+ return FALSE;
+ }
+
+ list = swtch->priv->options;
+ while (list != NULL) {
+ AlsaSwitchOption *option = ALSA_SWITCH_OPTION (list->data);
+
+ /* Mark the selected option when we find it, ALSA indentifies them
+ * by numeric indices */
+ if (alsa_switch_option_get_id (option) == item) {
+ _mate_mixer_switch_set_active_option (MATE_MIXER_SWITCH (swtch),
+ MATE_MIXER_SWITCH_OPTION (option));
+ return TRUE;
+ }
+ list = list->next;
+ }
+
+ g_warning ("Unknown active option of switch %s: %d",
+ snd_mixer_selem_get_name (swtch->priv->element),
+ item);
+
+ return FALSE;
+}