[ALSA] emu10k1: Add module option uint subsystem.

EMU10K1/EMU10K2 driver
It allows the user to force the snd-emu10k1 module to think the user
has a particular sound card. Useful if their particular sound card
is not yet recognised.
Signed-off-by: James Courtier-Dutton <James@superbug.co.uk>

include/sound/emu10k1.h

@@ -1167,6 +1167,7 @@ int snd_emu10k1_create(snd_card_t * card,
 		       unsigned short extout_mask,
 		       long max_cache_bytes,
 		       int enable_ir,
+		       uint subsystem,
 		       emu10k1_t ** remu);
 
 int snd_emu10k1_pcm(emu10k1_t * emu, int device, snd_pcm_t ** rpcm);

sound/pci/emu10k1/emu10k1.c

@@ -52,6 +52,7 @@ static int seq_ports[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 4};
 static int max_synth_voices[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 64};
 static int max_buffer_size[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 128};
 static int enable_ir[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 0};
+static uint subsystem[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 0}; /* Force card subsystem model */
 
 module_param_array(index, int, NULL, 0444);
 MODULE_PARM_DESC(index, "Index value for the EMU10K1 soundcard.");
@@ -71,7 +72,8 @@ module_param_array(max_buffer_size, int, NULL, 0444);
 MODULE_PARM_DESC(max_buffer_size, "Maximum sample buffer size in MB.");
 module_param_array(enable_ir, bool, NULL, 0444);
 MODULE_PARM_DESC(enable_ir, "Enable IR.");
-
+module_param_array(subsystem, uint, NULL, 0444);
+MODULE_PARM_DESC(subsystem, "Force card subsystem model.");
 /*
  * Class 0401: 1102:0008 (rev 00) Subsystem: 1102:1001 -> Audigy2 Value  Model:SB0400
  */
@@ -122,7 +124,7 @@ static int __devinit snd_card_emu10k1_probe(struct pci_dev *pci,
 		max_buffer_size[dev] = 1024;
 	if ((err = snd_emu10k1_create(card, pci, extin[dev], extout[dev],
 				      (long)max_buffer_size[dev] * 1024 * 1024,
-				      enable_ir[dev],
+				      enable_ir[dev], subsystem[dev],
 				      &emu)) < 0) {
 		snd_card_free(card);
 		return err;

sound/pci/emu10k1/emu10k1_main.c

@@ -832,6 +832,7 @@ int __devinit snd_emu10k1_create(snd_card_t * card,
 		       unsigned short extout_mask,
 		       long max_cache_bytes,
 		       int enable_ir,
+		       uint subsystem,
 		       emu10k1_t ** remu)
 {
 	emu10k1_t *emu;
@@ -877,10 +878,16 @@ int __devinit snd_emu10k1_create(snd_card_t * card,
 
 	for (c = emu_chip_details; c->vendor; c++) {
 		if (c->vendor == pci->vendor && c->device == pci->device) {
-			if (c->subsystem && c->subsystem != emu->serial)
-				continue;
-			if (c->revision && c->revision != emu->revision)
-				continue;
+			if (subsystem) {
+				if (c->subsystem && (c->subsystem == subsystem) ) {
+					break;
+				} else continue;
+			} else {
+				if (c->subsystem && (c->subsystem != emu->serial) )
+					continue;
+				if (c->revision && c->revision != emu->revision)
+					continue;
+			}
 			break;
 		}
 	}
@@ -891,10 +898,14 @@ int __devinit snd_emu10k1_create(snd_card_t * card,
 		return -ENOENT;
 	}
 	emu->card_capabilities = c;
-	if (c->subsystem != 0)
+	if (c->subsystem && !subsystem)
 		snd_printdd("Sound card name=%s\n", c->name);
-	else
-		snd_printdd("Sound card name=%s, vendor=0x%x, device=0x%x, subsystem=0x%x\n", c->name, pci->vendor, pci->device, emu->serial);
+	else if (subsystem) 
+		snd_printdd("Sound card name=%s, vendor=0x%x, device=0x%x, subsystem=0x%x. Forced to subsytem=0x%x\n",
+		       	c->name, pci->vendor, pci->device, emu->serial, c->subsystem);
+	else 
+		snd_printdd("Sound card name=%s, vendor=0x%x, device=0x%x, subsystem=0x%x.\n",
+		      	c->name, pci->vendor, pci->device, emu->serial);
 	
 	if (!*card->id && c->id) {
 		int i, n = 0;