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Add workaround for conflicting IEC958 controls for HD-audio

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When both an SPDIF and an HDMI output are present on HD-audio, both
try to access IEC958 controls with index=0 although one of them must
be wrong.  For avoiding this conflict, the recent kernel code (3.9 and
3.8 stable) moves the IEC958 controls of an SPDIF with index=16 once
when the conflict happens.

In this patch, the corresponding support is added in alsa-lib side.
The new "skip_rest" boolean flag is added to the hooked element
definition which indicates that the rest of element array will be
ignored once when this element is present and evaluated.  With this
new flag, the HD-audio config takes index=16 primarily, then take
index=0 as fallback.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2013-02-11 12:28:45 +01:00
parent 8c6da54073
commit f5f45589f8
2 changed files with 32 additions and 3 deletions
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19
src/control/setup.c
View file

@ -396,7 +396,7 @@ static int snd_config_get_ctl_elem_value(snd_config_t *conf,
return 0;
}
static int add_elem(snd_sctl_t *h, snd_config_t *_conf, snd_config_t *private_data)
static int add_elem(snd_sctl_t *h, snd_config_t *_conf, snd_config_t *private_data, int *quit)
{
snd_config_t *conf;
snd_config_iterator_t i, next;
@ -408,6 +408,7 @@ static int add_elem(snd_sctl_t *h, snd_config_t *_conf, snd_config_t *private_da
int lock = 0;
int preserve = 0;
int optional = 0;
int skip_rest = 0;
snd_config_t *value = NULL, *mask = NULL;
snd_sctl_elem_t *elem = NULL;
int err;
@ -491,6 +492,13 @@ static int add_elem(snd_sctl_t *h, snd_config_t *_conf, snd_config_t *private_da
optional = err;
continue;
}
if (strcmp(id, "skip_rest") == 0) {
err = snd_config_get_bool(n);
if (err < 0)
goto _err;
skip_rest = err;
continue;
}
SNDERR("Unknown field %s", id);
return -EINVAL;
}
@ -539,6 +547,9 @@ static int add_elem(snd_sctl_t *h, snd_config_t *_conf, snd_config_t *private_da
if (! optional)
SNDERR("Cannot obtain info for CTL elem (%s,'%s',%li,%li,%li): %s", snd_ctl_elem_iface_name(iface), name, index, device, subdevice, snd_strerror(err));
goto _err;
} else {
if (skip_rest)
*quit = 1;
}
snd_ctl_elem_value_set_id(elem->val, elem->id);
snd_ctl_elem_value_set_id(elem->old, elem->id);
@ -594,7 +605,7 @@ int snd_sctl_build(snd_sctl_t **sctl, snd_ctl_t *handle, snd_config_t *conf, snd
{
snd_sctl_t *h;
snd_config_iterator_t i, next;
int err;
int err, quit = 0;
assert(sctl);
assert(handle);
@ -614,11 +625,13 @@ int snd_sctl_build(snd_sctl_t **sctl, snd_ctl_t *handle, snd_config_t *conf, snd
INIT_LIST_HEAD(&h->elems);
snd_config_for_each(i, next, conf) {
snd_config_t *n = snd_config_iterator_entry(i);
err = add_elem(h, n, private_data);
err = add_elem(h, n, private_data, &quit);
if (err < 0) {
free_elems(h);
return err;
}
if (quit)
break;
}
*sctl = h;
return 0;