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Message-ID: <50EFC3DE.5070705@kernel.dk>
Date: Fri, 11 Jan 2013 08:48:46 +0100
From: Jens Axboe <axboe@...nel.dk>
To: Eldad Zack <eldad@...refinery.com>
CC: Takashi Iwai <tiwai@...e.de>, perex@...ex.cz,
alsa-devel@...a-project.org,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Oops in sound/usb/pcm.c:match_endpoint_audioformats() in current
-git
On 2013-01-10 20:45, Eldad Zack wrote:
> Jens, could you please send me the device's descriptors (lsusb -v)?
> I'd like to take a closer look at this.
Below.
Bus 006 Device 010: ID 22e8:dac1
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x22e8
idProduct 0xdac1
bcdDevice 3.21
iManufacturer 1 Cambridge Audio
iProduct 2 Cambridge Audio USB Audio 1.0
iSerial 3 0000
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 128
bNumInterfaces 2
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
(Bus Powered)
MaxPower 500mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 1 Audio
bInterfaceSubClass 1 Control Device
bInterfaceProtocol 0
iInterface 2 Cambridge Audio USB Audio 1.0
AudioControl Interface Descriptor:
bLength 9
bDescriptorType 36
bDescriptorSubtype 1 (HEADER)
bcdADC 1.00
wTotalLength 40
bInCollection 1
baInterfaceNr( 0) 1
AudioControl Interface Descriptor:
bLength 12
bDescriptorType 36
bDescriptorSubtype 2 (INPUT_TERMINAL)
bTerminalID 1
wTerminalType 0x0101 USB Streaming
bAssocTerminal 0
bNrChannels 2
wChannelConfig 0x0003
Left Front (L)
Right Front (R)
iChannelNames 0
iTerminal 6 Cambridge Audio Audio 1.0 Output
AudioControl Interface Descriptor:
bLength 10
bDescriptorType 36
bDescriptorSubtype 6 (FEATURE_UNIT)
bUnitID 10
bSourceID 1
bControlSize 1
bmaControls( 0) 0x01
Mute Control
bmaControls( 1) 0x01
Mute Control
bmaControls( 2) 0x01
Mute Control
iFeature 5 Cambridge Audio USB 1.0 Audio In
AudioControl Interface Descriptor:
bLength 9
bDescriptorType 36
bDescriptorSubtype 3 (OUTPUT_TERMINAL)
bTerminalID 6
wTerminalType 0x0301 Speaker
bAssocTerminal 0
bSourceID 10
iTerminal 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 0
iInterface 4 Cambridge Audio USB 1.0 Audio Out
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 1
bNumEndpoints 2
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 0
iInterface 4 Cambridge Audio USB 1.0 Audio Out
AudioStreaming Interface Descriptor:
bLength 7
bDescriptorType 36
bDescriptorSubtype 1 (AS_GENERAL)
bTerminalLink 1
bDelay 1 frames
wFormatTag 1 PCM
AudioStreaming Interface Descriptor:
bLength 20
bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
bNrChannels 2
bSubframeSize 3
bBitResolution 24
bSamFreqType 4 Discrete
tSamFreq[ 0] 44100
tSamFreq[ 1] 48000
tSamFreq[ 2] 88200
tSamFreq[ 3] 96000
Endpoint Descriptor:
bLength 9
bDescriptorType 5
bEndpointAddress 0x01 EP 1 OUT
bmAttributes 5
Transfer Type Isochronous
Synch Type Asynchronous
Usage Type Data
wMaxPacketSize 0x0246 1x 582 bytes
bInterval 1
bRefresh 0
bSynchAddress 129
AudioControl Endpoint Descriptor:
bLength 7
bDescriptorType 37
bDescriptorSubtype 1 (EP_GENERAL)
bmAttributes 0x01
Sampling Frequency
bLockDelayUnits 2 Decoded PCM samples
wLockDelay 0 Decoded PCM samples
Endpoint Descriptor:
bLength 9
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 1
Transfer Type Isochronous
Synch Type None
Usage Type Data
wMaxPacketSize 0x0003 1x 3 bytes
bInterval 1
bRefresh 4
bSynchAddress 0
Device Status: 0x0000
(Bus Powered)
--
Jens Axboe
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