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ALSA: usb-audio: Fix parameter block size for UAC2 control requests

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USB Audio Class version 2.0 supports three different parameter block sizes for
CUR requests, which are 1 byte (5.2.3.1 Layout 1 Parameter Block), 2 bytes
(5.2.3.2 Layout 2 Parameter Block) and 4 bytes (5.2.3.3 Layout 3 Parameter
Block). Use the correct size according to the specific control as it was
already done for UACv1. The allocated block size for control requests is
increased to support the 4 byte worst case.

Signed-off-by: Julian Scheel <julian@jusst.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Julian Scheel
2015-08-14 16:14:45 +02:00
committed by Takashi Iwai
parent 41450b1b5b
commit bc18e31c30
2 changed files with 46 additions and 20 deletions
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2
sound/usb/mixer.h
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@@ -33,6 +33,8 @@ enum {
USB_MIXER_U8,
USB_MIXER_S16,
USB_MIXER_U16,
USB_MIXER_S32,
USB_MIXER_U32,
};
typedef void (*usb_mixer_elem_dump_func_t)(struct snd_info_buffer *buffer,