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alsa: Jack detection kcontrol implementation

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Support the new jack detection interface implemented in Linux 3.3
(and Ubuntu's 3.2 kernel).

Jacks are probed and detected using the snd_hctl_* commands, which
means we need to listen to them using fdlists. As this detection
needs to be active even if there is currently no sink for the jack,
so this polling is done on the card level.

Also add configuration support in paths, like this:
[Jack Headphone]
required-any = any

...where 'Jack Headphone' should match 'Headphone Jack' as given by
ALSA (as seen in e g 'amixer controls').
"Required", "required-any" and "required-absent" is supported. Using
required-any, one can have several ports even though there is no
other indication in the mixer that this path exists.

Signed-off-by: David Henningsson <david.henningsson@canonical.com>
This commit is contained in:
David Henningsson 2012-02-23 07:17:02 +01:00 • committed by Arun Raghavan
parent 74e01ad616
commit dedf1340c6
14 changed files with 464 additions and 105 deletions
Download patch file Download diff file Expand all files Collapse all files

125
src/modules/alsa/alsa-util.c
View file

@ -1440,3 +1440,128 @@ pa_bool_t pa_alsa_may_tsched(pa_bool_t want) {
return TRUE;
}
snd_hctl_elem_t* pa_alsa_find_jack(snd_hctl_t *hctl, const char* jack_name)
{
snd_ctl_elem_id_t *id;
snd_ctl_elem_id_alloca(&id);
snd_ctl_elem_id_clear(id);
snd_ctl_elem_id_set_interface(id, SND_CTL_ELEM_IFACE_CARD);
snd_ctl_elem_id_set_name(id, jack_name);
return snd_hctl_find_elem(hctl, id);
}
static int prepare_mixer(snd_mixer_t *mixer, const char *dev, snd_hctl_t **hctl) {
int err;
pa_assert(mixer);
pa_assert(dev);
if ((err = snd_mixer_attach(mixer, dev)) < 0) {
pa_log_info("Unable to attach to mixer %s: %s", dev, pa_alsa_strerror(err));
return -1;
}
/* Note: The hctl handle returned should not be freed.
It is closed/freed by alsa-lib on snd_mixer_close/free */
if (hctl && (err = snd_mixer_get_hctl(mixer, dev, hctl)) < 0) {
pa_log_info("Unable to get hctl of mixer %s: %s", dev, pa_alsa_strerror(err));
return -1;
}
if ((err = snd_mixer_selem_register(mixer, NULL, NULL)) < 0) {
pa_log_warn("Unable to register mixer: %s", pa_alsa_strerror(err));
return -1;
}
if ((err = snd_mixer_load(mixer)) < 0) {
pa_log_warn("Unable to load mixer: %s", pa_alsa_strerror(err));
return -1;
}
pa_log_info("Successfully attached to mixer '%s'", dev);
return 0;
}
snd_mixer_t *pa_alsa_open_mixer(int alsa_card_index, char **ctl_device, snd_hctl_t **hctl) {
int err;
snd_mixer_t *m;
char *md;
snd_pcm_info_t* info;
snd_pcm_info_alloca(&info);
if ((err = snd_mixer_open(&m, 0)) < 0) {
pa_log("Error opening mixer: %s", pa_alsa_strerror(err));
return NULL;
}
/* Then, try by card index */
md = pa_sprintf_malloc("hw:%i", alsa_card_index);
if (prepare_mixer(m, md, hctl) >= 0) {
if (ctl_device)
*ctl_device = md;
else
pa_xfree(md);
return m;
}
pa_xfree(md);
snd_mixer_close(m);
return NULL;
}
snd_mixer_t *pa_alsa_open_mixer_for_pcm(snd_pcm_t *pcm, char **ctl_device, snd_hctl_t **hctl) {
int err;
snd_mixer_t *m;
const char *dev;
snd_pcm_info_t* info;
snd_pcm_info_alloca(&info);
pa_assert(pcm);
if ((err = snd_mixer_open(&m, 0)) < 0) {
pa_log("Error opening mixer: %s", pa_alsa_strerror(err));
return NULL;
}
/* First, try by name */
if ((dev = snd_pcm_name(pcm)))
if (prepare_mixer(m, dev, hctl) >= 0) {
if (ctl_device)
*ctl_device = pa_xstrdup(dev);
return m;
}
/* Then, try by card index */
if (snd_pcm_info(pcm, info) >= 0) {
char *md;
int card_idx;
if ((card_idx = snd_pcm_info_get_card(info)) >= 0) {
md = pa_sprintf_malloc("hw:%i", card_idx);
if (!dev || !pa_streq(dev, md))
if (prepare_mixer(m, md, hctl) >= 0) {
if (ctl_device)
*ctl_device = md;
else
pa_xfree(md);
return m;
}
pa_xfree(md);
}
}
snd_mixer_close(m);
return NULL;
}