On Tue, Sep 18, 2001, Lane Gearle Brooks <[EMAIL PROTECTED]> wrote:
> I am a hardware engineer at a startup digital camera company, and
> we are due to release our first digital camera sometime this winter.
> In my spare time I started working on a usb driver in linux for our
> camera, but I have run into some problems (I am an avid linux user,
> but am a newbie and kernal and driver development).
>
> Our camera uses bulk endpoints for communication, and in poking our
> the usb stuff, I noticed the dc2xx driver is a generic bulk end point
> driver. So I thought I would start by compiling the dc2xx driver
> with our vendor and product id included and try it out, but after
> doing that I cannot get the usb core to assign the dc2xx driver
> to our camera (even though it says that it registers the dc2xx
> driver). Any ideas on why? I am included the debug output showing
> what happens. (I am using kernel 2.4.3).
>
>
> kernel: hub.c: USB new device connect on bus1/1, assigned device number 2
> kernel: Manufacturer: SMaL Camera Technologies
> kernel: Product: Digital Camera
> kernel: usb.c: USB device 2 (vend/prod 0xdca/0xc) is not claimed by any active
>driver.
> kernel: Length = 18
> kernel: DescriptorType = 01
> kernel: USB version = 1.00
> kernel: Vendor:Product = 0dca:000c
> kernel: MaxPacketSize0 = 64
> kernel: NumConfigurations = 1
> kernel: Device version = 0.00
> kernel: Device Class:SubClass:Protocol = 00:00:00
> kernel: Per-interface classes
> kernel: Configuration:
> kernel: bLength = 9
> kernel: bDescriptorType = 02
> /sbin/hotplug: arguments (usb) env (PWD=/etc/hotplug DEVICE=/proc/bus/usb/001/002
>INTERFACE=6/1/1 ACTION=add DEBUG=kernel MACHTYPE=i386-redhat-linux-gnu OLDPWD=/
>DEVFS=/proc/bus/usb TYPE=0/0/0 SHLVL=1 SHELL=/bin/bash HOSTTYPE=i386 OSTYPE=linux-gnu
>HOME=/ TERM=dumb PRODUCT=dca/c/0 _=/usr/bin/env)
> kernel: wTotalLength = 0020
> /sbin/hotplug: invoke /etc/hotplug/usb.agent
> kernel: bNumInterfaces = 01
> kernel: bConfigurationValue = 01
> kernel: iConfiguration = 03
> kernel: bmAttributes = c0
> kernel: MaxPower = 100mA
> kernel:
> kernel: Interface: 0
> kernel: Alternate Setting: 0
> kernel: bLength = 9
> kernel: bDescriptorType = 04
> kernel: bInterfaceNumber = 00
> kernel: bAlternateSetting = 00
> kernel: bNumEndpoints = 02
> kernel: bInterface Class:SubClass:Protocol = 06:01:01
> kernel: iInterface = 00
> kernel: Endpoint:
> kernel: bLength = 7
> kernel: bDescriptorType = 05
> kernel: bEndpointAddress = 81 (in)
> kernel: bmAttributes = 02 (Bulk)
> kernel: wMaxPacketSize = 0040
> kernel: bInterval = 00
> kernel: Endpoint:
> kernel: bLength = 7
> kernel: bDescriptorType = 05
> kernel: bEndpointAddress = 01 (out)
> kernel: bmAttributes = 02 (Bulk)
> kernel: wMaxPacketSize = 0010
> kernel: bInterval = 00
> /etc/hotplug/usb.agent: Modprobe and setup dc2xx dc2xx for USB product dca/c/0
> kernel: usb.c: registered new driver dc2xx
>
>
>
> Then when I more /proc/bus/usb/devices, I get:
>
> T: Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 2 Spd=12 MxCh= 0
> D: Ver= 1.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
> P: Vendor=0dca ProdID=000c Rev= 0.00
> S: Manufacturer=SMaL Camera Technologies
> S: Product=Digital Camera
> C:* #Ifs= 1 Cfg#= 1 Atr=c0 MxPwr=100mA
> I: If#= 0 Alt= 0 #EPs= 2 Cls=06(unk. ) Sub=01 Prot=01 Driver=(none)
> E: Ad=81(I) Atr=02(Bulk) MxPS= 64 Ivl= 0ms
> E: Ad=01(O) Atr=02(Bulk) MxPS= 16 Ivl= 0ms
> .
It's probably because of this code:
/* models differ in how they report themselves */
interface = &dev->actconfig->interface[ifnum].altsetting[0];
if ((interface->bInterfaceClass != USB_CLASS_PER_INTERFACE
&& interface->bInterfaceClass != USB_CLASS_VENDOR_SPEC)
|| interface->bInterfaceSubClass != 0
|| interface->bInterfaceProtocol != 0
|| interface->bNumEndpoints != 2
) {
dbg ("Bogus camera interface info");
return NULL;
}
The interface class/subclass/protocol wouldn't match.
Aside from the minor code problems, you probably shouldn't be using a
kernel driver anyway. Take a look at gphoto2 to see how it supports all
of the cameras via USB.
What is Class 6 anyway? I haven't seen that yet.
JE
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