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/*
* Mixer Interface - main file
* Copyright (c) 1998/1999/2000 by Jaroslav Kysela <perex@suse.cz>
*
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Library 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 Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include "mixer_local.h"
static void snd_mixer_simple_read_rebuild(snd_ctl_t *ctl_handle, void *private_data);
static void snd_mixer_simple_read_add(snd_ctl_t *ctl_handle, void *private_data, snd_hctl_element_t *helem);
int snd_mixer_open(snd_mixer_t **r_handle, char *name)
{
snd_mixer_t *handle;
snd_ctl_t *ctl_handle;
int err;
if (r_handle == NULL)
return -EINVAL;
*r_handle = NULL;
if ((err = snd_ctl_open(&ctl_handle, name)) < 0)
return err;
handle = (snd_mixer_t *) calloc(1, sizeof(snd_mixer_t));
if (handle == NULL) {
snd_ctl_close(ctl_handle);
return -ENOMEM;
}
if ((err = snd_ctl_hcallback_rebuild(ctl_handle, snd_mixer_simple_read_rebuild, handle)) < 0) {
snd_ctl_close(ctl_handle);
free(handle);
return err;
}
if ((err = snd_ctl_hcallback_add(ctl_handle, snd_mixer_simple_read_add, handle)) < 0) {
snd_ctl_close(ctl_handle);
free(handle);
return err;
}
handle->ctl_handle = ctl_handle;
INIT_LIST_HEAD(&handle->simples);
*r_handle = handle;
return 0;
}
int snd_mixer_close(snd_mixer_t *handle)
{
int err = 0;
if (handle == NULL)
return -EINVAL;
if (handle->simple_valid)
snd_mixer_simple_destroy(handle);
if (handle->ctl_handle)
err = snd_ctl_close(handle->ctl_handle);
return err;
}
int snd_mixer_poll_descriptor(snd_mixer_t *handle)
{
if (handle == NULL || handle->ctl_handle == NULL)
return -EIO;
return snd_ctl_poll_descriptor(handle->ctl_handle);
}
const char *snd_mixer_simple_channel_name(snd_mixer_channel_id_t channel)
{
static char *array[snd_enum_to_int(SND_MIXER_CHN_LAST) + 1] = {
[SND_MIXER_CHN_FRONT_LEFT] = "Front Left",
[SND_MIXER_CHN_FRONT_RIGHT] = "Front Right",
[SND_MIXER_CHN_FRONT_CENTER] = "Front Center",
[SND_MIXER_CHN_REAR_LEFT] = "Rear Left",
[SND_MIXER_CHN_REAR_RIGHT] = "Rear Right",
[SND_MIXER_CHN_WOOFER] = "Woofer"
};
char *p;
assert(channel <= SND_MIXER_CHN_LAST);
p = array[snd_enum_to_int(channel)];
if (!p)
return "?";
return p;
}
int snd_mixer_simple_element_list(snd_mixer_t *handle, snd_mixer_simple_element_list_t *list)
{
struct list_head *lh;
mixer_simple_t *s;
snd_mixer_sid_t *p;
int err;
unsigned int idx;
if (handle == NULL || list == NULL)
return -EINVAL;
if (!handle->simple_valid)
if ((err = snd_mixer_simple_build(handle)) < 0)
return err;
list->controls_count = 0;
p = list->pids;
if (list->controls_request > 0 && p == NULL)
return -EINVAL;
idx = 0;
list_for_each(lh, &handle->simples) {
if (idx >= list->controls_offset + list->controls_request)
break;
if (idx >= list->controls_offset) {
s = list_entry(lh, mixer_simple_t, list);
memcpy(p, &s->sid, sizeof(*p)); p++;
list->controls_count++;
}
idx++;
}
list->controls = handle->simple_count;
return 0;
}
static mixer_simple_t *look_for_simple(snd_mixer_t *handle, snd_mixer_sid_t *sid)
{
struct list_head *list;
mixer_simple_t *s;
list_for_each(list, &handle->simples) {
s = list_entry(list, mixer_simple_t, list);
if (!strcmp(s->sid.name, sid->name) && s->sid.index == sid->index)
return s;
}
return NULL;
}
int snd_mixer_simple_element_read(snd_mixer_t *handle, snd_mixer_simple_element_t *control)
{
mixer_simple_t *s;
if (handle == NULL || control == NULL)
return -EINVAL;
if (!handle->simple_valid)
snd_mixer_simple_build(handle);
s = look_for_simple(handle, &control->sid);
if (s == NULL)
return -ENOENT;
if (s->get == NULL)
return -EIO;
return s->get(handle, s, control);
}
int snd_mixer_simple_element_write(snd_mixer_t *handle, snd_mixer_simple_element_t *control)
{
mixer_simple_t *s;
if (handle == NULL || control == NULL)
return -EINVAL;
if (!handle->simple_valid)
snd_mixer_simple_build(handle);
s = look_for_simple(handle, &control->sid);
if (s == NULL)
return -ENOENT;
if (s->put == NULL)
return -EIO;
return s->put(handle, s, control);
}
static void snd_mixer_simple_read_rebuild(snd_ctl_t *ctl_handle, void *private_data)
{
snd_mixer_t *handle = (snd_mixer_t *)private_data;
if (handle->ctl_handle != ctl_handle)
return;
handle->callbacks->rebuild(handle, handle->callbacks->private_data);
handle->simple_changes++;
}
static void snd_mixer_simple_read_add(snd_ctl_t *ctl_handle ATTRIBUTE_UNUSED, void *private_data, snd_hctl_element_t *helem)
{
snd_mixer_t *handle = (snd_mixer_t *)private_data;
mixer_simple_t *s;
struct list_head *list;
list_for_each(list, &handle->simples) {
s = list_entry(list, mixer_simple_t, list);
if (s->event_add)
s->event_add(handle, helem);
}
}
int snd_mixer_simple_read(snd_mixer_t *handle, snd_mixer_simple_callbacks_t *callbacks)
{
mixer_simple_t *s;
struct list_head *list;
int err;
if (handle == NULL || callbacks == NULL)
return -EINVAL;
if (!handle->simple_valid)
snd_mixer_simple_build(handle);
handle->callbacks = callbacks;
handle->simple_changes = 0;
if ((err = snd_ctl_hevent(handle->ctl_handle)) <= 0) {
handle->callbacks = NULL;
return err;
}
handle->callbacks = NULL;
list_for_each(list, &handle->simples) {
s = list_entry(list, mixer_simple_t, list);
if (s->change > 0) {
s->change = 0;
if (callbacks->value)
callbacks->value(handle, callbacks->private_data, &s->sid);
}
}
return handle->simple_changes;
}
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