ALSA: ice1724 - Create capture pcm only for ADC-enabled configurations

Add the capture pcm only if there is at least one ADC configured in
the SYSCONF register.
Signed-off-by: Pavel Hofman <pavel.hofman@ivitera.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/ice1712/envy24ht.h

@@ -66,6 +66,7 @@ enum {
 #define     VT1724_CFG_CLOCK384  0x40	/* 16.9344Mhz, 44.1kHz*384 */
 #define   VT1724_CFG_MPU401	0x20		/* MPU401 UARTs */
 #define   VT1724_CFG_ADC_MASK	0x0c	/* one, two or one and S/PDIF, stereo ADCs */
+#define   VT1724_CFG_ADC_NONE	0x0c	/* no ADCs */
 #define   VT1724_CFG_DAC_MASK	0x03	/* one, two, three, four stereo DACs */
 
 #define VT1724_REG_AC97_CFG		0x05	/* byte */

sound/pci/ice1712/ice1724.c

@@ -1117,14 +1117,21 @@ static struct snd_pcm_ops snd_vt1724_capture_pro_ops = {
 static int __devinit snd_vt1724_pcm_profi(struct snd_ice1712 *ice, int device)
 {
 	struct snd_pcm *pcm;
-	int err;
+	int capt, err;
 
-	err = snd_pcm_new(ice->card, "ICE1724", device, 1, 1, &pcm);
+	if ((ice->eeprom.data[ICE_EEP2_SYSCONF] & VT1724_CFG_ADC_MASK) ==
+	    VT1724_CFG_ADC_NONE)
+		capt = 0;
+	else
+		capt = 1;
+	err = snd_pcm_new(ice->card, "ICE1724", device, 1, capt, &pcm);
 	if (err < 0)
 		return err;
 
 	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_vt1724_playback_pro_ops);
-	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_vt1724_capture_pro_ops);
+	if (capt)
+		snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
+			&snd_vt1724_capture_pro_ops);
 
 	pcm->private_data = ice;
 	pcm->info_flags = 0;