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ALSA: usb-audio: parse UAC2 endpoint descriptors correctly

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UAC2 devices have their information about pitch control stored in a
different field. Parse it, and emulate the bits for a v1 device.

A new struct uac2_iso_endpoint_descriptor is added.

Signed-off-by: Daniel Mack <daniel@caiaq.de>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Daniel Mack 2010-05-26 18:11:38 +02:00 • committed by Takashi Iwai
parent 8d09124271
commit 43b8e3bc4a
2 changed files with 58 additions and 13 deletions
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16
include/linux/usb/audio-v2.h
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@ -105,6 +105,22 @@ struct uac_as_header_descriptor_v2 {
__u8 iChannelNames;
} __attribute__((packed));
/* 4.10.1.2 Class-Specific AS Isochronous Audio Data Endpoint Descriptor */
struct uac2_iso_endpoint_descriptor {
__u8 bLength; /* in bytes: 8 */
__u8 bDescriptorType; /* USB_DT_CS_ENDPOINT */
__u8 bDescriptorSubtype; /* EP_GENERAL */
__u8 bmAttributes;
__u8 bmControls;
__u8 bLockDelayUnits;
__le16 wLockDelay;
} __attribute__((packed));
#define UAC2_CONTROL_PITCH (3 << 0)
#define UAC2_CONTROL_DATA_OVERRUN (3 << 2)
#define UAC2_CONTROL_DATA_UNDERRUN (3 << 4)
/* 6.1 Interrupt Data Message */
#define UAC2_INTERRUPT_DATA_MSG_VENDOR (1 << 0)