[ALSA] ymfpci: fix volume handling of the 44.1 kHz slot

The existing code for handling the 44.1 slot's volume has two problems:
the volume is not affected by the 'Wave Playback Volume' mixer control,
and the BUF441OUTVOL register, which is used to control the per-
substream volume for this slot, uses a different scale than the gain
fields of the other slots.
This patch makes the BUF441OUTVOL register a shadow of the
NATIVEDACOUTVOL register so that the Wave volume is consistent for all
substreams.
As a consequence of this, the per-substream PCM volume control gets no
longer activated for the substream using this slot.  The code for
(de)activating the mixer control is moved from the open/close to the
prepare/trigger_stop callbacks so that it is able to determine the
substream's slot.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

sound/pci/ymfpci/ymfpci_main.c

@@ -171,17 +171,6 @@ static u32 snd_ymfpci_calc_lpfQ(u32 rate)
 	return val[0];
 }
 
-static void snd_ymfpci_pcm_441_volume_set(struct snd_ymfpci_pcm *ypcm)
-{
-	unsigned int value;
-	struct snd_ymfpci_pcm_mixer *mixer;
-	
-	mixer = &ypcm->chip->pcm_mixer[ypcm->substream->number];
-	value = min_t(unsigned int, mixer->left, 0x7fff) >> 1;
-	value |= (min_t(unsigned int, mixer->right, 0x7fff) >> 1) << 16;
-	snd_ymfpci_writel(ypcm->chip, YDSXGR_BUF441OUTVOL, value);
-}
-
 /*
  *  Hardware start management
  */
@@ -389,6 +378,7 @@ static int snd_ymfpci_playback_trigger(struct snd_pcm_substream *substream,
 {
 	struct snd_ymfpci *chip = snd_pcm_substream_chip(substream);
 	struct snd_ymfpci_pcm *ypcm = substream->runtime->private_data;
+	struct snd_kcontrol *kctl = NULL;
 	int result = 0;
 
 	spin_lock(&chip->reg_lock);
@@ -406,6 +396,11 @@ static int snd_ymfpci_playback_trigger(struct snd_pcm_substream *substream,
 		ypcm->running = 1;
 		break;
 	case SNDRV_PCM_TRIGGER_STOP:
+		if (substream->pcm == chip->pcm && !ypcm->use_441_slot) {
+			kctl = chip->pcm_mixer[substream->number].ctl;
+			kctl->vd[0].access |= SNDRV_CTL_ELEM_ACCESS_INACTIVE;
+		}
+		/* fall through */
 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 	case SNDRV_PCM_TRIGGER_SUSPEND:
 		chip->ctrl_playback[ypcm->voices[0]->number + 1] = 0;
@@ -419,6 +414,8 @@ static int snd_ymfpci_playback_trigger(struct snd_pcm_substream *substream,
 	}
       __unlock:
 	spin_unlock(&chip->reg_lock);
+	if (kctl)
+		snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_INFO, &kctl->id);
 	return result;
 }
 static int snd_ymfpci_capture_trigger(struct snd_pcm_substream *substream,
@@ -526,7 +523,6 @@ static void snd_ymfpci_pcm_init_voice(struct snd_ymfpci_pcm *ypcm, unsigned int
 		ypcm->chip->src441_used = voice->number;
 		ypcm->use_441_slot = 1;
 		format |= 0x10000000;
-		snd_ymfpci_pcm_441_volume_set(ypcm);
 	}
 	if (ypcm->chip->src441_used == voice->number &&
 	    (format & 0x10000000) == 0) {
@@ -667,6 +663,7 @@ static int snd_ymfpci_playback_prepare(struct snd_pcm_substream *substream)
 	struct snd_ymfpci *chip = snd_pcm_substream_chip(substream);
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct snd_ymfpci_pcm *ypcm = runtime->private_data;
+	struct snd_kcontrol *kctl;
 	unsigned int nvoice;
 
 	ypcm->period_size = runtime->period_size;
@@ -676,6 +673,12 @@ static int snd_ymfpci_playback_prepare(struct snd_pcm_substream *substream)
 	for (nvoice = 0; nvoice < runtime->channels; nvoice++)
 		snd_ymfpci_pcm_init_voice(ypcm, nvoice, runtime,
 					  substream->pcm == chip->pcm);
+
+	if (substream->pcm == chip->pcm && !ypcm->use_441_slot) {
+		kctl = chip->pcm_mixer[substream->number].ctl;
+		kctl->vd[0].access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
+		snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_INFO, &kctl->id);
+	}
 	return 0;
 }
 
@@ -926,7 +929,6 @@ static int snd_ymfpci_playback_open(struct snd_pcm_substream *substream)
 	struct snd_ymfpci *chip = snd_pcm_substream_chip(substream);
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct snd_ymfpci_pcm *ypcm;
-	struct snd_kcontrol *kctl;
 	int err;
 	
 	if ((err = snd_ymfpci_playback_open_1(substream)) < 0)
@@ -941,10 +943,6 @@ static int snd_ymfpci_playback_open(struct snd_pcm_substream *substream)
 		chip->rear_opened++;
 	}
 	spin_unlock_irq(&chip->reg_lock);
-
-	kctl = chip->pcm_mixer[substream->number].ctl;
-	kctl->vd[0].access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
-	snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_INFO, &kctl->id);
 	return 0;
 }
 
@@ -1039,7 +1037,6 @@ static int snd_ymfpci_playback_close(struct snd_pcm_substream *substream)
 {
 	struct snd_ymfpci *chip = snd_pcm_substream_chip(substream);
 	struct snd_ymfpci_pcm *ypcm = substream->runtime->private_data;
-	struct snd_kcontrol *kctl;
 
 	spin_lock_irq(&chip->reg_lock);
 	if (ypcm->output_rear && chip->rear_opened > 0) {
@@ -1047,9 +1044,6 @@ static int snd_ymfpci_playback_close(struct snd_pcm_substream *substream)
 		ymfpci_close_extension(chip);
 	}
 	spin_unlock_irq(&chip->reg_lock);
-	kctl = chip->pcm_mixer[substream->number].ctl;
-	kctl->vd[0].access |= SNDRV_CTL_ELEM_ACCESS_INACTIVE;
-	snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_INFO, &kctl->id);
 	return snd_ymfpci_playback_close_1(substream);
 }
 
@@ -1552,6 +1546,26 @@ static int snd_ymfpci_put_double(struct snd_kcontrol *kcontrol, struct snd_ctl_e
 	return change;
 }
 
+static int snd_ymfpci_put_nativedacvol(struct snd_kcontrol *kcontrol,
+				       struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_ymfpci *chip = snd_kcontrol_chip(kcontrol);
+	unsigned int reg = YDSXGR_NATIVEDACOUTVOL;
+	unsigned int reg2 = YDSXGR_BUF441OUTVOL;
+	int change;
+	unsigned int value, oval;
+	
+	value = ucontrol->value.integer.value[0] & 0x3fff;
+	value |= (ucontrol->value.integer.value[1] & 0x3fff) << 16;
+	spin_lock_irq(&chip->reg_lock);
+	oval = snd_ymfpci_readl(chip, reg);
+	change = value != oval;
+	snd_ymfpci_writel(chip, reg, value);
+	snd_ymfpci_writel(chip, reg2, value);
+	spin_unlock_irq(&chip->reg_lock);
+	return change;
+}
+
 /*
  * 4ch duplication
  */
@@ -1576,7 +1590,17 @@ static int snd_ymfpci_put_dup4ch(struct snd_kcontrol *kcontrol, struct snd_ctl_e
 
 
 static struct snd_kcontrol_new snd_ymfpci_controls[] __devinitdata = {
-YMFPCI_DOUBLE("Wave Playback Volume", 0, YDSXGR_NATIVEDACOUTVOL),
+{
+	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+	.name = "Wave Playback Volume",
+	.access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
+		  SNDRV_CTL_ELEM_ACCESS_TLV_READ,
+	.info = snd_ymfpci_info_double,
+	.get = snd_ymfpci_get_double,
+	.put = snd_ymfpci_put_nativedacvol,
+	.private_value = YDSXGR_NATIVEDACOUTVOL,
+	.tlv = { .p = db_scale_native },
+},
 YMFPCI_DOUBLE("Wave Capture Volume", 0, YDSXGR_NATIVEDACLOOPVOL),
 YMFPCI_DOUBLE("Digital Capture Volume", 0, YDSXGR_NATIVEDACINVOL),
 YMFPCI_DOUBLE("Digital Capture Volume", 1, YDSXGR_NATIVEADCINVOL),
@@ -1719,8 +1743,6 @@ static int snd_ymfpci_pcm_vol_put(struct snd_kcontrol *kcontrol,
 			struct snd_ymfpci_pcm *ypcm = substream->runtime->private_data;
 			if (!ypcm->use_441_slot)
 				ypcm->update_pcm_vol = 2;
-			else
-				snd_ymfpci_pcm_441_volume_set(ypcm);
 		}
 		spin_unlock_irqrestore(&chip->voice_lock, flags);
 		return 1;