From 43b8e3bc4af0b435fddaa59e827ca1010b024492 Mon Sep 17 00:00:00 2001 From: Daniel Mack Date: Wed, 26 May 2010 18:11:38 +0200 Subject: ALSA: usb-audio: parse UAC2 endpoint descriptors correctly 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 Acked-by: Greg Kroah-Hartman Signed-off-by: Takashi Iwai --- include/linux/usb/audio-v2.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) (limited to 'include') diff --git a/include/linux/usb/audio-v2.h b/include/linux/usb/audio-v2.h index 2389f93a28b..92f1d99f0f1 100644 --- a/include/linux/usb/audio-v2.h +++ b/include/linux/usb/audio-v2.h @@ -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) -- cgit v1.2.3