ALSA: Au88x0 - Implement subdevice volume controls

- add "PCM Playback Volume" controls for 16 playback subdevices
  This allow application to change the volume of each subdevice
  by using hardware mixer of au88x0 and default is zero gain/attenunation.

Signed-off-by: Raymond Yau <superquad.vortex2@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 123 insertions, 4 deletions

diff --git a/sound/pci/au88x0/au88x0_pcm.c b/sound/pci/au88x0/au88x0_pcm.c
index 0ef2f97..e59f120 100644
--- a/sound/pci/au88x0/au88x0_pcm.c
+++ b/sound/pci/au88x0/au88x0_pcm.c
@@ -122,6 +122,18 @@ static struct snd_pcm_hw_constraint_list hw_constraints_au8830_channels = {
 	.mask = 0,
 };
 #endif
+
+static void vortex_notify_pcm_vol_change(struct snd_card *card,
+			struct snd_kcontrol *kctl, int activate)
+{
+	if (activate)
+		kctl->vd[0].access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
+	else
+		kctl->vd[0].access |= SNDRV_CTL_ELEM_ACCESS_INACTIVE;
+	snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE |
+				SNDRV_CTL_EVENT_MASK_INFO, &(kctl->id));
+}
+
 /* open callback */
 static int snd_vortex_pcm_open(struct snd_pcm_substream *substream)
 {
@@ -230,12 +242,14 @@ snd_vortex_pcm_hw_params(struct snd_pcm_substream *substream,
 		if (stream != NULL)
 			vortex_adb_allocroute(chip, stream->dma,
 					      stream->nr_ch, stream->dir,
-					      stream->type);
+					      stream->type,
+					      substream->number);
 		/* Alloc routes. */
 		dma =
 		    vortex_adb_allocroute(chip, -1,
 					  params_channels(hw_params),
-					  substream->stream, type);
+					  substream->stream, type,
+					  substream->number);
 		if (dma < 0) {
 			spin_unlock_irq(&chip->lock);
 			return dma;
@@ -246,6 +260,11 @@ snd_vortex_pcm_hw_params(struct snd_pcm_substream *substream,
 		vortex_adbdma_setbuffers(chip, dma,
 					 params_period_bytes(hw_params),
 					 params_periods(hw_params));
+		if (VORTEX_PCM_TYPE(substream->pcm) == VORTEX_PCM_ADB) {
+			chip->pcm_vol[substream->number].active = 1;
+			vortex_notify_pcm_vol_change(chip->card,
+				chip->pcm_vol[substream->number].kctl, 1);
+		}
 	}
 #ifndef CHIP_AU8810
 	else {
@@ -275,10 +294,18 @@ static int snd_vortex_pcm_hw_free(struct snd_pcm_substream *substream)
 	spin_lock_irq(&chip->lock);
 	// Delete audio routes.
 	if (VORTEX_PCM_TYPE(substream->pcm) != VORTEX_PCM_WT) {
-		if (stream != NULL)
+		if (stream != NULL) {
+			if (VORTEX_PCM_TYPE(substream->pcm) == VORTEX_PCM_ADB) {
+				chip->pcm_vol[substream->number].active = 0;
+				vortex_notify_pcm_vol_change(chip->card,
+					chip->pcm_vol[substream->number].kctl,
+					0);
+			}
 			vortex_adb_allocroute(chip, stream->dma,
 					      stream->nr_ch, stream->dir,
-					      stream->type);
+					      stream->type,
+					      substream->number);
+		}
 	}
 #ifndef CHIP_AU8810
 	else {
@@ -506,6 +533,83 @@ static struct snd_kcontrol_new snd_vortex_mixer_spdif[] __devinitdata = {
 	},
 };
 
+/* subdevice PCM Volume control */
+
+static int snd_vortex_pcm_vol_info(struct snd_kcontrol *kcontrol,
+				struct snd_ctl_elem_info *uinfo)
+{
+	vortex_t *vortex = snd_kcontrol_chip(kcontrol);
+	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
+	uinfo->count = (VORTEX_IS_QUAD(vortex) ? 4 : 2);
+	uinfo->value.integer.min = -128;
+	uinfo->value.integer.max = 32;
+	return 0;
+}
+
+static int snd_vortex_pcm_vol_get(struct snd_kcontrol *kcontrol,
+				struct snd_ctl_elem_value *ucontrol)
+{
+	int i;
+	vortex_t *vortex = snd_kcontrol_chip(kcontrol);
+	int subdev = kcontrol->id.subdevice;
+	struct pcm_vol *p = &vortex->pcm_vol[subdev];
+	int max_chn = (VORTEX_IS_QUAD(vortex) ? 4 : 2);
+	for (i = 0; i < max_chn; i++)
+		ucontrol->value.integer.value[i] = p->vol[i];
+	return 0;
+}
+
+static int snd_vortex_pcm_vol_put(struct snd_kcontrol *kcontrol,
+				struct snd_ctl_elem_value *ucontrol)
+{
+	int i;
+	int changed = 0;
+	int mixin;
+	unsigned char vol;
+	vortex_t *vortex = snd_kcontrol_chip(kcontrol);
+	int subdev = kcontrol->id.subdevice;
+	struct pcm_vol *p = &vortex->pcm_vol[subdev];
+	int max_chn = (VORTEX_IS_QUAD(vortex) ? 4 : 2);
+	for (i = 0; i < max_chn; i++) {
+		if (p->vol[i] != ucontrol->value.integer.value[i]) {
+			p->vol[i] = ucontrol->value.integer.value[i];
+			if (p->active) {
+				switch (vortex->dma_adb[p->dma].nr_ch) {
+				case 1:
+					mixin = p->mixin[0];
+					break;
+				case 2:
+				default:
+					mixin = p->mixin[(i < 2) ? i : (i - 2)];
+					break;
+				case 4:
+					mixin = p->mixin[i];
+					break;
+				};
+				vol = p->vol[i];
+				vortex_mix_setinputvolumebyte(vortex,
+					vortex->mixplayb[i], mixin, vol);
+			}
+			changed = 1;
+		}
+	}
+	return changed;
+}
+
+static const DECLARE_TLV_DB_MINMAX(vortex_pcm_vol_db_scale, -9600, 2400);
+
+static struct snd_kcontrol_new snd_vortex_pcm_vol __devinitdata = {
+	.iface = SNDRV_CTL_ELEM_IFACE_PCM,
+	.name = "PCM Playback Volume",
+	.access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
+		SNDRV_CTL_ELEM_ACCESS_TLV_READ |
+		SNDRV_CTL_ELEM_ACCESS_INACTIVE,
+	.info = snd_vortex_pcm_vol_info,
+	.get = snd_vortex_pcm_vol_get,
+	.put = snd_vortex_pcm_vol_put,
+	.tlv = { .p = vortex_pcm_vol_db_scale },
+};
+
 /* create a pcm device */
 static int __devinit snd_vortex_new_pcm(vortex_t *chip, int idx, int nr)
 {
@@ -555,5 +659,20 @@ static int __devinit snd_vortex_new_pcm(vortex_t *chip, int idx, int nr)
 				return err;
 		}
 	}
+	if (VORTEX_PCM_TYPE(pcm) == VORTEX_PCM_ADB) {
+		for (i = 0; i < NR_PCM; i++) {
+			chip->pcm_vol[i].active = 0;
+			chip->pcm_vol[i].dma = -1;
+			kctl = snd_ctl_new1(&snd_vortex_pcm_vol, chip);
+			if (!kctl)
+				return -ENOMEM;
+			chip->pcm_vol[i].kctl = kctl;
+			kctl->id.device = 0;
+			kctl->id.subdevice = i;
+			err = snd_ctl_add(chip->card, kctl);
+			if (err < 0)
+				return err;
+		}
+	}
 	return 0;
 }