ALSA: emu10k1: clean up P16V part somewhat

Detach it better from the main PCM driver, which it really doesn't have
much in common with.

In particular, this moves the interrupt handler implementation into
p16v.c, and makes it access the substream runtime status more directly,
so it doesn't need to abuse structs snd_emu10k1_pcm and
snd_emu10k1_voice any more.

We don't need private pcm runtime data at all, as the only thing it was
used for (except the back-link to the substream) was the `running` flag.
So store that directly in runtime->private_data.

This somewhat radical strip-down shows that this driver contains some
complexity that was never actually utilized. I suppose the right way to
fully utilize the hardware in a simple way would be introducing more
substreams. This wouldn't require any of the removed code.

Signed-off-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>

Link: https://lore.kernel.org/r/20230421141006.1005452-7-oswald.buddenhagen@gmx.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

2 files changed, 49 insertions, 94 deletions

diff --git a/sound/pci/emu10k1/irq.c b/sound/pci/emu10k1/irq.c
index ebb2275efb6c..dfb44e5e69a7 100644
--- a/sound/pci/emu10k1/irq.c
+++ b/sound/pci/emu10k1/irq.c
@@ -18,7 +18,7 @@
 irqreturn_t snd_emu10k1_interrupt(int irq, void *dev_id)
 {
 	struct snd_emu10k1 *emu = dev_id;
-	unsigned int status, status2, orig_status, orig_status2;
+	unsigned int status, orig_status;
 	int handled = 0;
 	int timeout = 0;
 
@@ -139,32 +139,10 @@ irqreturn_t snd_emu10k1_interrupt(int irq, void *dev_id)
 			status &= ~IPR_FXDSP;
 		}
 		if (status & IPR_P16V) {
-			while ((status2 = inl(emu->port + IPR2)) != 0) {
-				u32 mask = INTE2_PLAYBACK_CH_0_LOOP;  /* Full Loop */
-				struct snd_emu10k1_voice *pvoice = &(emu->p16v_voices[0]);
-				struct snd_emu10k1_voice *cvoice = &(emu->p16v_capture_voice);
-
-				/* dev_dbg(emu->card->dev, "status2=0x%x\n", status2); */
-				orig_status2 = status2;
-				if(status2 & mask) {
-					if(pvoice->use) {
-						snd_pcm_period_elapsed(pvoice->epcm->substream);
-					} else { 
-						dev_err(emu->card->dev,
-							"p16v: status: 0x%08x, mask=0x%08x, pvoice=%p, use=%d\n",
-							status2, mask, pvoice,
-							pvoice->use);
-					}
-				}
-				if(status2 & 0x110000) {
-					/* dev_info(emu->card->dev, "capture int found\n"); */
-					if(cvoice->use) {
-						/* dev_info(emu->card->dev, "capture period_elapsed\n"); */
-						snd_pcm_period_elapsed(cvoice->epcm->substream);
-					}
-				}
-				outl(orig_status2, emu->port + IPR2); /* ack all */
-			}
+			if (emu->p16v_interrupt)
+				emu->p16v_interrupt(emu);
+			else
+				outl(0, emu->port + INTE2);
 			status &= ~IPR_P16V;
 		}
 
diff --git a/sound/pci/emu10k1/p16v.c b/sound/pci/emu10k1/p16v.c
index f5e0972187a7..ce4d3450959c 100644
--- a/sound/pci/emu10k1/p16v.c
+++ b/sound/pci/emu10k1/p16v.c
@@ -149,41 +149,19 @@ static const struct snd_pcm_hardware snd_p16v_capture_hw = {
 	.fifo_size =		0,
 };
 
-static void snd_p16v_pcm_free_substream(struct snd_pcm_runtime *runtime)
-{
-	struct snd_emu10k1_pcm *epcm = runtime->private_data;
-
-	kfree(epcm);
-}
-
 /* open_playback callback */
 static int snd_p16v_pcm_open_playback_channel(struct snd_pcm_substream *substream, int channel_id)
 {
-	struct snd_emu10k1 *emu = snd_pcm_substream_chip(substream);
-        struct snd_emu10k1_voice *channel = &(emu->p16v_voices[channel_id]);
-	struct snd_emu10k1_pcm *epcm;
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	int err;
 
-	epcm = kzalloc(sizeof(*epcm), GFP_KERNEL);
-	/* dev_dbg(emu->card->dev, "epcm kcalloc: %p\n", epcm); */
-
-	if (epcm == NULL)
-		return -ENOMEM;
-	epcm->emu = emu;
-	epcm->substream = substream;
 	/*
 	dev_dbg(emu->card->dev, "epcm device=%d, channel_id=%d\n",
 		   substream->pcm->device, channel_id);
 	*/
-	runtime->private_data = epcm;
-	runtime->private_free = snd_p16v_pcm_free_substream;
   
 	runtime->hw = snd_p16v_playback_hw;
 
-        channel->number = channel_id;
-
-        channel->use=1;
 #if 0 /* debug */
 	dev_dbg(emu->card->dev,
 		   "p16v: open channel_id=%d, channel=%p, use=0x%x\n",
@@ -192,7 +170,6 @@ static int snd_p16v_pcm_open_playback_channel(struct snd_pcm_substream *substrea
 	       channel_id, chip, channel);
 #endif /* debug */
 	/* channel->interrupt = snd_p16v_pcm_channel_interrupt; */
-	channel->epcm = epcm;
 	err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
 	if (err < 0)
                 return err;
@@ -204,43 +181,20 @@ static int snd_p16v_pcm_open_playback_channel(struct snd_pcm_substream *substrea
 
 	return 0;
 }
+
 /* open_capture callback */
 static int snd_p16v_pcm_open_capture_channel(struct snd_pcm_substream *substream, int channel_id)
 {
-	struct snd_emu10k1 *emu = snd_pcm_substream_chip(substream);
-	struct snd_emu10k1_voice *channel = &(emu->p16v_capture_voice);
-	struct snd_emu10k1_pcm *epcm;
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	int err;
 
-	epcm = kzalloc(sizeof(*epcm), GFP_KERNEL);
-	/* dev_dbg(emu->card->dev, "epcm kcalloc: %p\n", epcm); */
-
-	if (epcm == NULL)
-		return -ENOMEM;
-	epcm->emu = emu;
-	epcm->substream = substream;
 	/*
 	dev_dbg(emu->card->dev, "epcm device=%d, channel_id=%d\n",
 		   substream->pcm->device, channel_id);
 	*/
-	runtime->private_data = epcm;
-	runtime->private_free = snd_p16v_pcm_free_substream;
   
 	runtime->hw = snd_p16v_capture_hw;
 
-	channel->number = channel_id;
-
-	channel->use=1;
-#if 0 /* debug */
-	dev_dbg(emu->card->dev,
-		   "p16v: open channel_id=%d, channel=%p, use=0x%x\n",
-		   channel_id, channel, channel->use);
-	dev_dbg(emu->card->dev, "open:channel_id=%d, chip=%p, channel=%p\n",
-	       channel_id, chip, channel);
-#endif /* debug */
-	/* channel->interrupt = snd_p16v_pcm_channel_interrupt; */
-	channel->epcm = epcm;
 	err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
 	if (err < 0)
 		return err;
@@ -252,22 +206,12 @@ static int snd_p16v_pcm_open_capture_channel(struct snd_pcm_substream *substream
 /* close callback */
 static int snd_p16v_pcm_close_playback(struct snd_pcm_substream *substream)
 {
-	struct snd_emu10k1 *emu = snd_pcm_substream_chip(substream);
-	//struct snd_pcm_runtime *runtime = substream->runtime;
-	//struct snd_emu10k1_pcm *epcm = runtime->private_data;
-	emu->p16v_voices[substream->pcm->device - emu->p16v_device_offset].use = 0;
-	/* FIXME: maybe zero others */
 	return 0;
 }
 
 /* close callback */
 static int snd_p16v_pcm_close_capture(struct snd_pcm_substream *substream)
 {
-	struct snd_emu10k1 *emu = snd_pcm_substream_chip(substream);
-	//struct snd_pcm_runtime *runtime = substream->runtime;
-	//struct snd_emu10k1_pcm *epcm = runtime->private_data;
-	emu->p16v_capture_voice.use = 0;
-	/* FIXME: maybe zero others */
 	return 0;
 }
 
@@ -409,13 +353,48 @@ static void snd_p16v_intr_disable(struct snd_emu10k1 *emu, unsigned int intrenb)
 	spin_unlock_irqrestore(&emu->emu_lock, flags);
 }
 
+static void snd_p16v_interrupt(struct snd_emu10k1 *emu)
+{
+	unsigned int status;
+
+	while ((status = inl(emu->port + IPR2)) != 0) {
+		u32 mask = INTE2_PLAYBACK_CH_0_LOOP;  /* Full Loop */
+
+		/* dev_dbg(emu->card->dev, "p16v status=0x%x\n", status); */
+		if (status & mask) {
+			struct snd_pcm_substream *substream =
+					emu->pcm_p16v->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
+			struct snd_pcm_runtime *runtime = substream->runtime;
+
+			if (runtime && runtime->private_data) {
+				snd_pcm_period_elapsed(substream);
+			} else {
+				dev_err(emu->card->dev,
+					"p16v: status: 0x%08x, mask=0x%08x\n",
+					status, mask);
+			}
+		}
+		if (status & 0x110000) {
+			struct snd_pcm_substream *substream =
+					emu->pcm_p16v->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
+			struct snd_pcm_runtime *runtime = substream->runtime;
+
+			/* dev_info(emu->card->dev, "capture int found\n"); */
+			if (runtime && runtime->private_data) {
+				/* dev_info(emu->card->dev, "capture period_elapsed\n"); */
+				snd_pcm_period_elapsed(substream);
+			}
+		}
+		outl(status, emu->port + IPR2); /* ack all */
+	}
+}
+
 /* trigger_playback callback */
 static int snd_p16v_pcm_trigger_playback(struct snd_pcm_substream *substream,
 				    int cmd)
 {
 	struct snd_emu10k1 *emu = snd_pcm_substream_chip(substream);
 	struct snd_pcm_runtime *runtime;
-	struct snd_emu10k1_pcm *epcm;
 	int channel;
 	int result = 0;
         struct snd_pcm_substream *s;
@@ -437,10 +416,9 @@ static int snd_p16v_pcm_trigger_playback(struct snd_pcm_substream *substream,
 		    s->stream != SNDRV_PCM_STREAM_PLAYBACK)
 			continue;
 		runtime = s->runtime;
-		epcm = runtime->private_data;
 		channel = substream->pcm->device-emu->p16v_device_offset;
 		/* dev_dbg(emu->card->dev, "p16v channel=%d\n", channel); */
-		epcm->running = running;
+		runtime->private_data = (void *)(ptrdiff_t)running;
 		basic |= (0x1<<channel);
 		inte |= (INTE2_PLAYBACK_CH_0_LOOP<<channel);
                 snd_pcm_trigger_done(s, substream);
@@ -469,7 +447,6 @@ static int snd_p16v_pcm_trigger_capture(struct snd_pcm_substream *substream,
 {
 	struct snd_emu10k1 *emu = snd_pcm_substream_chip(substream);
 	struct snd_pcm_runtime *runtime = substream->runtime;
-	struct snd_emu10k1_pcm *epcm = runtime->private_data;
 	int channel = 0;
 	int result = 0;
 	u32 inte = INTE2_CAPTURE_CH_0_LOOP | INTE2_CAPTURE_CH_0_HALF_LOOP;
@@ -478,13 +455,13 @@ static int snd_p16v_pcm_trigger_capture(struct snd_pcm_substream *substream,
 	case SNDRV_PCM_TRIGGER_START:
 		snd_p16v_intr_enable(emu, inte);
 		snd_emu10k1_ptr20_write(emu, BASIC_INTERRUPT, 0, snd_emu10k1_ptr20_read(emu, BASIC_INTERRUPT, 0)|(0x100<<channel));
-		epcm->running = 1;
+		runtime->private_data = (void *)1;
 		break;
 	case SNDRV_PCM_TRIGGER_STOP:
 		snd_emu10k1_ptr20_write(emu, BASIC_INTERRUPT, 0, snd_emu10k1_ptr20_read(emu, BASIC_INTERRUPT, 0) & ~(0x100<<channel));
 		snd_p16v_intr_disable(emu, inte);
 		//snd_emu10k1_ptr20_write(emu, EXTENDED_INT_MASK, 0, snd_emu10k1_ptr20_read(emu, EXTENDED_INT_MASK, 0) & ~(0x110000<<channel));
-		epcm->running = 0;
+		runtime->private_data = NULL;
 		break;
 	default:
 		result = -EINVAL;
@@ -499,10 +476,10 @@ snd_p16v_pcm_pointer_playback(struct snd_pcm_substream *substream)
 {
 	struct snd_emu10k1 *emu = snd_pcm_substream_chip(substream);
 	struct snd_pcm_runtime *runtime = substream->runtime;
-	struct snd_emu10k1_pcm *epcm = runtime->private_data;
 	snd_pcm_uframes_t ptr, ptr1, ptr2,ptr3,ptr4 = 0;
 	int channel = substream->pcm->device - emu->p16v_device_offset;
-	if (!epcm->running)
+
+	if (!runtime->private_data)
 		return 0;
 
 	ptr3 = snd_emu10k1_ptr20_read(emu, PLAYBACK_LIST_PTR, channel);
@@ -524,11 +501,10 @@ snd_p16v_pcm_pointer_capture(struct snd_pcm_substream *substream)
 {
 	struct snd_emu10k1 *emu = snd_pcm_substream_chip(substream);
 	struct snd_pcm_runtime *runtime = substream->runtime;
-	struct snd_emu10k1_pcm *epcm = runtime->private_data;
 	snd_pcm_uframes_t ptr, ptr1, ptr2 = 0;
 	int channel = 0;
 
-	if (!epcm->running)
+	if (!runtime->private_data)
 		return 0;
 
 	ptr1 = snd_emu10k1_ptr20_read(emu, CAPTURE_POINTER, channel);
@@ -589,6 +565,7 @@ int snd_p16v_pcm(struct snd_emu10k1 *emu, int device)
 	pcm->dev_subclass = SNDRV_PCM_SUBCLASS_GENERIC_MIX;
 	strcpy(pcm->name, "p16v");
 	emu->pcm_p16v = pcm;
+	emu->p16v_interrupt = snd_p16v_interrupt;
 
 	for(substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; 
 	    substream;