I have a usb device (lsusb -v below) running custom firmware based on
example code from Atmel . There are two interfaces: 0 is a mass storage
interface with two endpoints, 1 is a custom vendor interface with one
interrupt IN endpoint. The custom interface is used to send data to an
app on the host based on libusb (Ubuntu 2.6.22-14-generic kernel).
Custom commands are sent to the device on the default control endpoint.
When I remove interface 0 (mass storage) in the firmware, the custom
interface works as expected. I can send commands on the default endpoint
and successfully read resulting data on the interrupt IN endpoint.
But when I enable the mass storage IF I can no longer read from the
interrupt endpoint. Each read request returns almost immediately with no
data. This is what reads look like in usbmon's output:
cd5c10c0 2870377317 S Ii:107:03 -115 32 <
cd5c10c0 2870424737 C Ii:107:03 -84 0
Error 84 is EILSEQ, and looking around the kernel source seems to mean
"protocol error or unplug" (although it has various uses). Any ideas why
this might be happening? I've been digging around the firmware code, but
I was hoping someone might have some suggestions.
Bus 002 Device 107: ID 03eb:201e Atmel Corp.
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x03eb Atmel Corp.
idProduct 0x201e
bcdDevice 10.00
iManufacturer 1 ATMEL
iProduct 2 AVR USB HID DEMO
iSerial 3 1.0.0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 48
bNumInterfaces 2
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
(Bus Powered)
MaxPower 100mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 8 Mass Storage
bInterfaceSubClass 6 SCSI
bInterfaceProtocol 80 Bulk (Zip)
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0020 1x 32 bytes
bInterval 20
Device Status: 0x0000
(Bus Powered)
-Brad
-------------------------------------------------------------------------
This SF.net email is sponsored by: Splunk Inc.
Still grepping through log files to find problems? Stop.
Now Search log events and configuration files using AJAX and a browser.
Download your FREE copy of Splunk now >> http://get.splunk.com/
_______________________________________________
Linux-usb-users@lists.sourceforge.net
To unsubscribe, use the last form field at:
https://lists.sourceforge.net/lists/listinfo/linux-usb-users
