void analog_volume_init(void)
{
snd_ctl_elem_info_t *info;
int i;
snd_ctl_elem_info_alloca(&info);
snd_ctl_elem_info_set_interface(info, SND_CTL_ELEM_IFACE_MIXER);
for (i = 0; i < 10; i++) {
snd_ctl_elem_info_set_name(info, DAC_VOLUME_NAME);
snd_ctl_elem_info_set_numid(info, 0);
snd_ctl_elem_info_set_index(info, i);
if (snd_ctl_elem_info(ctl, info) < 0)
break;
dac_max = snd_ctl_elem_info_get_max(info);
}
if (i < output_channels - 1)
dac_volumes = i;
else
dac_volumes = output_channels;
snd_ctl_elem_info_set_name(info, DAC_SENSE_NAME);
for (i = 0; i < dac_volumes; i++) {
snd_ctl_elem_info_set_numid(info, 0);
snd_ctl_elem_info_set_index(info, i);
if (snd_ctl_elem_info(ctl, info) < 0)
break;
}
dac_senses = i;
if (dac_senses > 0) {
snd_ctl_elem_info_set_numid(info, 0);
snd_ctl_elem_info_set_index(info, 0);
snd_ctl_elem_info(ctl, info);
dac_sense_items = snd_ctl_elem_info_get_items(info);
for (i = 0; i < dac_sense_items; i++) {
snd_ctl_elem_info_set_item(info, i);
snd_ctl_elem_info(ctl, info);
dac_sense_name[i] = strdup(snd_ctl_elem_info_get_item_name(info));
}
}
for (i = 0; i < 10; i++) {
snd_ctl_elem_info_set_name(info, ADC_VOLUME_NAME);
snd_ctl_elem_info_set_numid(info, 0);
snd_ctl_elem_info_set_index(info, i);
if (snd_ctl_elem_info(ctl, info) < 0)
break;
adc_max = snd_ctl_elem_info_get_max(info);
}
if (i < input_channels - 1)
adc_volumes = i;
else
adc_volumes = input_channels;
snd_ctl_elem_info_set_name(info, ADC_SENSE_NAME);
for (i = 0; i < adc_volumes; i++) {
snd_ctl_elem_info_set_numid(info, 0);
snd_ctl_elem_info_set_index(info, i);
if (snd_ctl_elem_info(ctl, info) < 0)
break;
}
adc_senses = i;
if (adc_senses > 0) {
snd_ctl_elem_info_set_numid(info, 0);
snd_ctl_elem_info_set_index(info, 0);
snd_ctl_elem_info(ctl, info);
adc_sense_items = snd_ctl_elem_info_get_items(info);
for (i = 0; i < adc_sense_items; i++) {
snd_ctl_elem_info_set_item(info, i);
snd_ctl_elem_info(ctl, info);
adc_sense_name[i] = strdup(snd_ctl_elem_info_get_item_name(info));
}
}
for (i = 0; i < 10; i++) {
snd_ctl_elem_info_set_name(info, IPGA_VOLUME_NAME);
snd_ctl_elem_info_set_numid(info, 0);
snd_ctl_elem_info_set_index(info, i);
if (snd_ctl_elem_info(ctl, info) < 0)
break;
}
if (i < input_channels - 1)
ipga_volumes = i;
else
ipga_volumes = input_channels;
}
static int check_elem_set_props(struct elem_set_trial *trial)
{
snd_ctl_elem_id_t *id;
snd_ctl_elem_info_t *info;
unsigned int numid;
unsigned int index;
unsigned int i;
unsigned int j;
int err;
snd_ctl_elem_id_alloca(&id);
snd_ctl_elem_info_alloca(&info);
snd_ctl_elem_info_set_id(info, trial->id);
numid = snd_ctl_elem_id_get_numid(trial->id);
index = snd_ctl_elem_id_get_index(trial->id);
for (i = 0; i < trial->element_count; ++i) {
snd_ctl_elem_info_set_index(info, index + i);
/*
* In Linux 4.0 or former, ioctl(SNDRV_CTL_IOCTL_ELEM_ADD)
* doesn't fill all of fields for identification.
*/
if (numid > 0)
snd_ctl_elem_info_set_numid(info, numid + i);
err = snd_ctl_elem_info(trial->handle, info);
if (err < 0)
return err;
/* Check some common properties. */
if (snd_ctl_elem_info_get_type(info) != trial->type)
return -EIO;
if (snd_ctl_elem_info_get_count(info) != trial->member_count)
return -EIO;
for (j = 0; j < 4; ++j) {
if (snd_ctl_elem_info_get_dimension(info, j) !=
trial->dimension[j])
return -EIO;
}
/*
* In a case of IPC, this is the others. But in this case,
* it's myself.
*/
if (snd_ctl_elem_info_get_owner(info) != getpid())
return -EIO;
/*
* Just adding an element set by userspace applications,
* included elements are initially locked.
*/
if (!snd_ctl_elem_info_is_locked(info))
return -EIO;
/* Check type-specific properties. */
if (trial->check_elem_props != NULL) {
err = trial->check_elem_props(trial, info);
if (err < 0)
return err;
}
snd_ctl_elem_info_get_id(info, id);
err = snd_ctl_elem_unlock(trial->handle, id);
if (err < 0)
return err;
}
return 0;
}
