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authorDaniel Mack <daniel@caiaq.de>2010-05-26 20:11:38 +0400
committerTakashi Iwai <tiwai@suse.de>2010-05-27 11:49:22 +0400
commit43b8e3bc4af0b435fddaa59e827ca1010b024492 (patch)
treef5d6a8e46a9ae219b7c3fb9297ad08c6c901359a /include/linux/usb/audio-v2.h
parent8d0912427113723c3f3a4dca631638844c4ab649 (diff)
downloadlinux-43b8e3bc4af0b435fddaa59e827ca1010b024492.tar.xz
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/linux/usb/audio-v2.h')
-rw-r--r--include/linux/usb/audio-v2.h16
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)