ALSA: emu10k1: improve voice status display in /proc

Eliminate the MIDI type, as there is no such thing - the MPU401 port
doesn't have anything to do with voices.

For clarity, differentiate between regular and extra voices.

Don't atomize the enum into bits in the table display.

Simplify/optimize the storage.
Signed-off-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
Link: https://lore.kernel.org/r/20230518140947.3725394-4-oswald.buddenhagen@gmx.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

include/sound/emu10k1.h

@@ -1439,21 +1439,20 @@ SUB_REG_NC(A_EHC, A_I2S_CAPTURE_RATE, 0x00000e00)  /* This sets the capture PCM
 /* ------------------- STRUCTURES -------------------- */
 
 enum {
+	EMU10K1_UNUSED,  // This must be zero
 	EMU10K1_EFX,
+	EMU10K1_EFX_IRQ,
 	EMU10K1_PCM,
+	EMU10K1_PCM_IRQ,
 	EMU10K1_SYNTH,
-	EMU10K1_MIDI
+	EMU10K1_NUM_TYPES
 };
 
 struct snd_emu10k1;
 
 struct snd_emu10k1_voice {
-	int number;
-	unsigned int use: 1,
-	    pcm: 1,
-	    efx: 1,
-	    synth: 1,
-	    midi: 1;
+	unsigned char number;
+	unsigned char use;
 	void (*interrupt)(struct snd_emu10k1 *emu, struct snd_emu10k1_voice *pvoice);
 
 	struct snd_emu10k1_pcm *epcm;

sound/pci/emu10k1/emupcm.c

@@ -117,7 +117,7 @@ static int snd_emu10k1_pcm_channel_alloc(struct snd_emu10k1_pcm * epcm, int voic
 		// period-sized loop as the interrupt source. Additionally, the interrupt
 		// timing of the hardware is "suboptimal" and needs some compensation.
 		err = snd_emu10k1_voice_alloc(epcm->emu,
-					      epcm->type == PLAYBACK_EMUVOICE ? EMU10K1_PCM : EMU10K1_EFX,
+					      epcm->type == PLAYBACK_EMUVOICE ? EMU10K1_PCM_IRQ : EMU10K1_EFX_IRQ,
 					      1,
 					      &epcm->extra);
 		if (err < 0) {

sound/pci/emu10k1/emuproc.c

@@ -367,17 +367,17 @@ static void snd_emu10k1_proc_voices_read(struct snd_info_entry *entry,
 	struct snd_emu10k1 *emu = entry->private_data;
 	struct snd_emu10k1_voice *voice;
 	int idx;
-	
-	snd_iprintf(buffer, "ch\tuse\tpcm\tefx\tsynth\tmidi\n");
+	static const char * const types[] = {
+		"Unused", "EFX", "EFX IRQ", "PCM", "PCM IRQ", "Synth"
+	};
+	static_assert(ARRAY_SIZE(types) == EMU10K1_NUM_TYPES);
+
+	snd_iprintf(buffer, "ch\tuse\n");
 	for (idx = 0; idx < NUM_G; idx++) {
 		voice = &emu->voices[idx];
-		snd_iprintf(buffer, "%i\t%i\t%i\t%i\t%i\t%i\n",
+		snd_iprintf(buffer, "%i\t%s\n",
 			idx,
-			voice->use,
-			voice->pcm,
-			voice->efx,
-			voice->synth,
-			voice->midi);
+			types[voice->use]);
 	}
 }
 

sound/pci/emu10k1/voice.c

@@ -78,21 +78,7 @@ static int voice_alloc(struct snd_emu10k1 *emu, int type, int number,
 		dev_dbg(emu->card->dev, "voice alloc - %i, %i of %i\n",
 		       voice->number, idx-first_voice+1, number);
 		*/
-		voice->use = 1;
-		switch (type) {
-		case EMU10K1_PCM:
-			voice->pcm = 1;
-			break;
-		case EMU10K1_SYNTH:
-			voice->synth = 1;
-			break;
-		case EMU10K1_MIDI:
-			voice->midi = 1;
-			break;
-		case EMU10K1_EFX:
-			voice->efx = 1;
-			break;
-		}
+		voice->use = type;
 	}
 	*rvoice = &emu->voices[first_voice];
 	return 0;
@@ -103,7 +89,7 @@ static void voice_free(struct snd_emu10k1 *emu,
 {
 	snd_emu10k1_voice_init(emu, pvoice->number);
 	pvoice->interrupt = NULL;
-	pvoice->use = pvoice->pcm = pvoice->synth = pvoice->midi = pvoice->efx = 0;
+	pvoice->use = 0;
 	pvoice->epcm = NULL;
 }
 
@@ -121,7 +107,7 @@ int snd_emu10k1_voice_alloc(struct snd_emu10k1 *emu, int type, int number,
 	spin_lock_irqsave(&emu->voice_lock, flags);
 	for (;;) {
 		result = voice_alloc(emu, type, number, rvoice);
-		if (result == 0 || type == EMU10K1_SYNTH || type == EMU10K1_MIDI)
+		if (result == 0 || type == EMU10K1_SYNTH)
 			break;
 
 		/* free a voice from synth */