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| author | Daniel Mack <daniel@caiaq.de> | 2010-05-26 18:11:38 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2010-05-27 09:49:22 +0200 |
| commit | 43b8e3bc4af0b435fddaa59e827ca1010b024492 (patch) | |
| tree | f5d6a8e46a9ae219b7c3fb9297ad08c6c901359a /include | |
| parent | ALSA: usb-audio: fix return values (diff) | |
| download | linux-43b8e3bc4af0b435fddaa59e827ca1010b024492.tar.xz linux-43b8e3bc4af0b435fddaa59e827ca1010b024492.zip | |
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 <daniel@caiaq.de>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/usb/audio-v2.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/include/linux/usb/audio-v2.h b/include/linux/usb/audio-v2.h index 2389f93a28b5..92f1d99f0f17 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) |