2012-10-21 上午6:11 於 "Clemens Ladisch" clemens@ladisch.de 寫道：
The following changes since commit
a0d271cbfed1dd50278c6b06bead3d00ba0a88f9:
Linux 3.6 (2012-09-30 16:47:46 -0700)
are available in the git repository at: git://git.alsa-project.org/alsa-kprivate.git dummy-ctl-inactive
Quite a few mixer applications do not handle deactivated controls correctly. This patch adds such controls to snd-dummy to make crash^H^H^H^H^Htesting these apps easier.
what is the meaning of deactivated control ?
amixer still can change the value of the deactivated cd volume control if write access is no disabled
Clemens Ladisch (1): ALSA: dummy: allow disabling mixer controls
sound/drivers/dummy.c | 73
+++++++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 71 insertions(+), 2 deletions(-)
diff --git a/sound/drivers/dummy.c b/sound/drivers/dummy.c index 54bb664..4f522cf 100644 --- a/sound/drivers/dummy.c +++ b/sound/drivers/dummy.c @@ -134,6 +134,9 @@ struct snd_dummy { spinlock_t mixer_lock; int mixer_volume[MIXER_ADDR_LAST+1][2]; int capture_source[MIXER_ADDR_LAST+1][2];
int iobox;struct snd_kcontrol *cd_volume_ctl;struct snd_kcontrol *cd_switch_ctl; const struct dummy_timer_ops *timer_ops;};
@@ -817,6 +820,57 @@ static int snd_dummy_capsrc_put(struct snd_kcontrol
*kcontrol, struct snd_ctl_el
return change;}
+static int snd_dummy_iobox_info(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_info *info)+{
const char *const names[] = { "None", "CD Player" };return snd_ctl_enum_info(info, 1, 2, names);+}
+static int snd_dummy_iobox_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *value)+{
struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);value->value.enumerated.item[0] = dummy->iobox;return 0;+}
+static int snd_dummy_iobox_put(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *value)+{
struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);int changed;if (value->value.enumerated.item[0] > 1)return -EINVAL;changed = value->value.enumerated.item[0] != dummy->iobox;if (changed) {dummy->iobox = value->value.enumerated.item[0];if (dummy->iobox) {dummy->cd_volume_ctl->vd[0].access &=~SNDRV_CTL_ELEM_ACCESS_INACTIVE;dummy->cd_switch_ctl->vd[0].access &=~SNDRV_CTL_ELEM_ACCESS_INACTIVE;} else {dummy->cd_volume_ctl->vd[0].access |=SNDRV_CTL_ELEM_ACCESS_INACTIVE;dummy->cd_switch_ctl->vd[0].access |=SNDRV_CTL_ELEM_ACCESS_INACTIVE;}snd_ctl_notify(dummy->card, SNDRV_CTL_EVENT_MASK_INFO,&dummy->cd_volume_ctl->id);snd_ctl_notify(dummy->card, SNDRV_CTL_EVENT_MASK_INFO,&dummy->cd_switch_ctl->id);}return changed;+}
static struct snd_kcontrol_new snd_dummy_controls[] = { DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER), DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER), @@ -827,22 +881,37 @@ DUMMY_CAPSRC("Line Capture Switch", 0,
MIXER_ADDR_LINE),
DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC), DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MIC), DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD), -DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_CD) +DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_CD), +{
.iface = SNDRV_CTL_ELEM_IFACE_MIXER,.name = "External I/O Box",.info = snd_dummy_iobox_info,.get = snd_dummy_iobox_get,.put = snd_dummy_iobox_put,+}, };
static int __devinit snd_card_dummy_new_mixer(struct snd_dummy *dummy) { struct snd_card *card = dummy->card;
struct snd_kcontrol *kcontrol; unsigned int idx; int err; spin_lock_init(&dummy->mixer_lock); strcpy(card->mixername, "Dummy Mixer");dummy->iobox = 1; for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) {
err = snd_ctl_add(card,
snd_ctl_new1(&snd_dummy_controls[idx], dummy));
kcontrol = snd_ctl_new1(&snd_dummy_controls[idx], dummy);err = snd_ctl_add(card, kcontrol); if (err < 0) return err;if (!strcmp(kcontrol->id.name, "CD Volume"))dummy->cd_volume_ctl = kcontrol;else if (!strcmp(kcontrol->id.name, "CD Capture Switch"))dummy->cd_switch_ctl = kcontrol;} return 0;}