ALSA: snd_usb_caiaq: fix legacy input streaming

Seems that nobody recently tried the input on the very first supported
sound card model, RK2. This patch fixes the byte offset to make it
running again.
Signed-off-by: NDaniel Mack <daniel@caiaq.de>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

sound/usb/caiaq/audio.c

@@ -199,8 +199,9 @@ static int snd_usb_caiaq_pcm_prepare(struct snd_pcm_substream *substream)
 		dev->period_out_count[index] = BYTES_PER_SAMPLE + 1;
 		dev->audio_out_buf_pos[index] = BYTES_PER_SAMPLE + 1;
 	} else {
-		dev->period_in_count[index] = BYTES_PER_SAMPLE;
-		dev->audio_in_buf_pos[index] = BYTES_PER_SAMPLE;
+		int in_pos = (dev->spec.data_alignment == 2) ? 0 : 2;
+		dev->period_in_count[index] = BYTES_PER_SAMPLE + in_pos;
+		dev->audio_in_buf_pos[index] = BYTES_PER_SAMPLE + in_pos;
 	}
 
 	if (dev->streaming)

sound/usb/caiaq/device.c

@@ -35,7 +35,7 @@
 #include "input.h"
 
 MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
-MODULE_DESCRIPTION("caiaq USB audio, version 1.3.16");
+MODULE_DESCRIPTION("caiaq USB audio, version 1.3.17");
 MODULE_LICENSE("GPL");
 MODULE_SUPPORTED_DEVICE("{{Native Instruments, RigKontrol2},"
 			 "{Native Instruments, RigKontrol3},"