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/*
* Copyright (C) 2014 Michal Ratajsky <michal.ratajsky@gmail.com>
*
* 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;
}
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