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ALSA: usb-audio: update clock valid control

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Make the "clock valid" control a global control instead of a mixer
so that it doesn't appear in mixer applications.

Additionally, remove the check for writeability prohibited by spec, and
Use common code to read the control value.

Tested with a UAC2 Audio device that presents a clock validity
control.  The control still shows up in /proc usbmixer but not
in alsamixer.

Signed-off-by: Andrew Chant <achant@google.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Andrew Chant 2018-03-23 19:25:24 -07:00 committed by Takashi Iwai
parent 5a222e8494
commit 568fa7e087
1 changed files with 19 additions and 14 deletions
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33
sound/usb/mixer.c
View file

@ -1235,9 +1235,9 @@ static int mixer_ctl_feature_put(struct snd_kcontrol *kcontrol,
return changed;
}
/* get the current value from a mixer element */
static int mixer_ctl_connector_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
/* get the boolean value from the master channel of a UAC control */
static int mixer_ctl_master_bool_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct usb_mixer_elem_info *cval = kcontrol->private_data;
int val, err;
@ -1267,13 +1267,16 @@ static const struct snd_kcontrol_new usb_feature_unit_ctl_ro = {
.put = NULL,
};
/* A UAC connector mixer control */
static struct snd_kcontrol_new usb_connector_ctl_ro = {
/*
* A control which shows the boolean value from reading a UAC control on
* the master channel.
*/
static struct snd_kcontrol_new usb_bool_master_control_ctl_ro = {
.iface = SNDRV_CTL_ELEM_IFACE_CARD,
.name = "", /* will be filled later manually */
.access = SNDRV_CTL_ELEM_ACCESS_READ,
.info = snd_ctl_boolean_mono_info,
.get = mixer_ctl_connector_get,
.get = mixer_ctl_master_bool_get,
.put = NULL,
};
@ -1520,12 +1523,18 @@ static void build_connector_control(struct mixer_build *state,
if (!cval)
return;
snd_usb_mixer_elem_init_std(&cval->head, state->mixer, term->id);
/*
* The first byte from reading the UAC2_TE_CONNECTOR control returns the
* number of channels connected. This boolean ctl will simply report
* if any channels are connected or not.
* (Audio20_final.pdf Table 5-10: Connector Control CUR Parameter Block)
*/
cval->control = UAC2_TE_CONNECTOR;
cval->val_type = USB_MIXER_BOOLEAN;
cval->channels = 1; /* report true if any channel is connected */
cval->min = 0;
cval->max = 1;
kctl = snd_ctl_new1(&usb_connector_ctl_ro, cval);
kctl = snd_ctl_new1(&usb_bool_master_control_ctl_ro, cval);
if (!kctl) {
usb_audio_err(state->chip, "cannot malloc kcontrol\n");
kfree(cval);
@ -1576,13 +1585,9 @@ static int parse_clock_source_unit(struct mixer_build *state, int unitid,
cval->val_type = USB_MIXER_BOOLEAN;
cval->control = UAC2_CS_CONTROL_CLOCK_VALID;
if (uac_v2v3_control_is_writeable(hdr->bmControls,
UAC2_CS_CONTROL_CLOCK_VALID))
kctl = snd_ctl_new1(&usb_feature_unit_ctl, cval);
else {
cval->master_readonly = 1;
kctl = snd_ctl_new1(&usb_feature_unit_ctl_ro, cval);
}
cval->master_readonly = 1;
/* From UAC2 5.2.5.1.2 "Only the get request is supported." */
kctl = snd_ctl_new1(&usb_bool_master_control_ctl_ro, cval);
if (!kctl) {
kfree(cval);