ALSA: dice: remove local frag of force_two_pcms

At present, to add PCM substreams for each of available tx/rx streams,
this driver uses a condition based on model-name. This is not enough
to support unknown models.

In former commits, this driver gains cache of stream formats. For models
which support protocol extension, all of available steam formats are
cached. For known models, hard-coded stream formats are used to generate
the cache. For unknown models, stream formats at current mode of sampling
transmission frequency is cached.

Anyway, at least, the cached formats are used to expose constrains of PCM
substreams for userspace applications. Thus, The cached data can be also
used to add PCM substreams themselves, instead of the name-based
conditions.

This commit obsoletes local frag of force_two_pcms.
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/firewire/dice/dice-pcm.c

@@ -428,40 +428,18 @@ int snd_dice_create_pcm(struct snd_dice *dice)
 		.mmap      = snd_pcm_lib_mmap_vmalloc,
 	};
 	struct snd_pcm *pcm;
-	unsigned int i, max_capture, max_playback, capture, playback;
+	unsigned int capture, playback;
+	int i, j;
 	int err;
 
-	/* Check whether PCM substreams are required. */
-	if (dice->force_two_pcms) {
-		max_capture = max_playback = 2;
-	} else {
-		int j;
-		max_capture = max_playback = 0;
-		for (i = 0; i < MAX_STREAMS; ++i) {
-			for (j = 0; j < SND_DICE_RATE_MODE_COUNT; ++j) {
-				if (dice->tx_pcm_chs[i][j] > 0) {
-					++max_capture;
-					break;
-				}
-			}
-
-			for (j = 0; j < SND_DICE_RATE_MODE_COUNT; ++j) {
-				if (dice->rx_pcm_chs[i][j] > 0) {
-					++max_playback;
-					break;
-				}
-			}
-		}
-	}
-
 	for (i = 0; i < MAX_STREAMS; i++) {
 		capture = playback = 0;
-		if (i < max_capture)
-			capture = 1;
-		if (i < max_playback)
-			playback = 1;
-		if (capture == 0 && playback == 0)
-			break;
+		for (j = 0; j < SND_DICE_RATE_MODE_COUNT; ++j) {
+			if (dice->tx_pcm_chs[i][j] > 0)
+				capture = 1;
+			if (dice->rx_pcm_chs[i][j] > 0)
+				playback = 1;
+		}
 
 		err = snd_pcm_new(dice->card, "DICE", i, playback, capture,
 				  &pcm);

sound/firewire/dice/dice.c

@@ -24,36 +24,6 @@ MODULE_LICENSE("GPL v2");
 
 #define MODEL_ALESIS_IO_BOTH	0x000001
 
-/*
- * Some models support several isochronous channels, while these streams are not
- * always available. In this case, add the model name to this list.
- */
-static bool force_two_pcm_support(struct fw_unit *unit)
-{
-	static const char *const models[] = {
-		/* TC Electronic models. */
-		"StudioKonnekt48",
-		/* Focusrite models. */
-		"SAFFIRE_PRO_40",
-		"LIQUID_SAFFIRE_56",
-		"SAFFIRE_PRO_40_1",
-	};
-	char model[32];
-	unsigned int i;
-	int err;
-
-	err = fw_csr_string(unit->directory, CSR_MODEL, model, sizeof(model));
-	if (err < 0)
-		return false;
-
-	for (i = 0; i < ARRAY_SIZE(models); i++) {
-		if (strcmp(models[i], model) == 0)
-			break;
-	}
-
-	return i < ARRAY_SIZE(models);
-}
-
 static int check_dice_category(struct fw_unit *unit)
 {
 	struct fw_device *device = fw_parent_device(unit);
@@ -79,11 +49,6 @@ static int check_dice_category(struct fw_unit *unit)
 		}
 	}
 
-	if (vendor == OUI_FOCUSRITE || vendor == OUI_TCELECTRONIC) {
-		if (force_two_pcm_support(unit))
-			return 0;
-	}
-
 	if (vendor == OUI_WEISS)
 		category = WEISS_CATEGORY_ID;
 	else if (vendor == OUI_LOUD)
@@ -190,9 +155,6 @@ static void do_registration(struct work_struct *work)
 	if (err < 0)
 		return;
 
-	if (force_two_pcm_support(dice->unit))
-		dice->force_two_pcms = true;
-
 	err = snd_dice_transaction_init(dice);
 	if (err < 0)
 		goto error;

sound/firewire/dice/dice.h

@@ -113,8 +113,6 @@ struct snd_dice {
 	bool global_enabled;
 	struct completion clock_accepted;
 	unsigned int substreams_counter;
-
-	bool force_two_pcms;
 };
 
 enum snd_dice_addr_type {