Hi. I'm pretty new to USB, so bear with me if I seem confused.
I have a new device I'm writing a driver for. 2.6.0-test1 detects the device
and puts it in the USB tree. My driver's probe function is being called.
However, the user space utility lsusb cannot always see the device properly.
I am using lsusb from the usbutils-0.11 package I downloaded today.
The first time I use lsusb after plugging the device, I get output
like this:
Bus 001 Device 004: ID 0525:dead Netchip Technology Inc.
Language IDs: none (cannot get min. string descriptor; got len=-1, error=71:Protocol
error)
cannot get string descriptor 1, error = Protocol error(71)
cannot get string descriptor 2, error = Protocol error(71)
string descriptor 3 invalid (bf bf; len=0)
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.10
bDeviceClass 255 Vendor Specific Class
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x0525 Netchip Technology Inc.
idProduct 0xdead
bcdDevice 2.02
iManufacturer 1
iProduct 2
iSerial 3
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 25
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xc0
Self Powered
MaxPower 500mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 2
Transfer Type Bulk
Synch Type none
wMaxPacketSize 512
bInterval 1
Language IDs: (length=4)
0409 English(US)
After getting the above info out once, my device appears to time out. I get
the following:
Bus 001 Device 010: ID 0525:dead Netchip Technology Inc.
cannot get string descriptor 1, error = Connection timed out(110)
cannot get string descriptor 2, error = Connection timed out(110)
cannot get string descriptor 3, error = Connection timed out(110)
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.10
bDeviceClass 255 Vendor Specific Class
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x0525 Netchip Technology Inc.
idProduct 0xdead
bcdDevice 2.02
iManufacturer 1
iProduct 2
iSerial 3
bNumConfigurations 1
cannot get config descriptor 0, Value too large for defined data type (75)
Language IDs: none (invalid length string descriptor 32; len=25)
with a lot of
usbfs: USBDEVFS_CONTROL failed cmd lsusb dev 10 rqt 128 rq 6 len 256 ret -110
drivers/usb/core/message.c: usb_control/bulk_msg: timeout
in my log file.
However, I can insmod my driver at this point and the calls to
retval = usb_get_string (udev, 0x0409, 1, stringbuf, sizeof(stringbuf));
work fine. The vendor returned from this call is _not_ Netchip Technology
Inc. The usb_interface passed to my probe function also always contains
the proper endpoint descriptor although lsusb can no longer see it.
I have inserted and removed my driver many times without a single timeout
or protocol error.
Also, if I do 'cat /proc/bus/usb/devices' I see the following in my log:
ehci_hcd 0000:02:04.2: devpath 4 ep0in 3strikes
ehci_hcd 0000:02:04.2: devpath 4 ep0in 3strikes
ehci_hcd 0000:02:04.2: devpath 4 ep0in 3strikes
ehci_hcd 0000:02:04.2: devpath 4 ep0in 3strikes
ehci_hcd 0000:02:04.2: devpath 4 ep0in 3strikes
ehci_hcd 0000:02:04.2: devpath 4 ep0in 3strikes
This is my driver's entry in /proc/bus/usb/devices
T: Bus=01 Lev=01 Prnt=01 Port=03 Cnt=01 Dev#= 10 Spd=480 MxCh= 0
D: Ver= 2.10 Cls=ff(vend.) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
P: Vendor=0525 ProdID=dead Rev= 2.02
C:* #Ifs= 1 Cfg#= 1 Atr=c0 MxPwr=500mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=ff(vend.) Sub=00 Prot=00 Driver=(none)
E: Ad=81(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
If there is a regression test or anything that would be useful for me to run
against this device, I'd be happy to do so.
cheers
-mark
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