Creating a new map entry for an odd device

Creating a new map entry for an odd device

[Bob Minowicz]

If this is the wrong forum for a request for help, I apologize.  please
direct me to the appropriate mailing list.

I've recently obtained a Sampo Scream Cam DCE-310M.  The device is a
3-in-1 USB digital camera/color web cam/MP3 player.  I've been trying to
figure out how to get it to work fully under Linux. Has anyone had any
experiences with this device?

From my observations of how the Windows software operates, the MP3
player and digital camera functionality is accessed by turning the
camera on and connecting it to the USB cable.  Leaving the camera turned
off and connecting it to the USB cable causes it to function as a web
cam.

When I connect the camera (while turned on) under Linux, the USB
subsystem finds a new device, but the hotplug usb agent fails to find a
matching entry in the map.

From /proc/bus/usb/devices:

T:  Bus\x01 Lev\x01 Prnt\x01 Port\x01 Cnt\x02 Dev#= 16 Spd\x12  MxCh= 0
D:  Ver= 1.00 Cls\0(>ifc ) Sub\0 Prot\0 MxPS= 8 #Cfgs=  1
P:  Vendor\f25 ProdID\x0310 Rev= 3.00
S:  Manufacturer=NetChip Technology
S:  Product=NET2888 USB Interface Controller
C:* #Ifs= 1 Cfg#= 1 Atr` MxPwrP0mA
I:  If#= 0 Alt= 0 #EPs= 4 Clsÿ(vend.) Sub\0 Prot\0 Driver=(none)
E:  Ad\x01(O) Atr\x02(Bulk) MxPS=   8 Ivl=0ms
E:  Ad‚(I) Atr\x03(Int.) MxPS=   8 Ivl%5ms
E:  Ad\x03(O) Atr\x02(Bulk) MxPS=  64 Ivl=0ms
E:  Ad„(I) Atr\x02(Bulk) MxPS=  64 Ivl=0ms

Is there a way that I can compose a map entry for the hotplug usb agent
from this information?  I believe the device may well function with the
usb-storage module, but I need the map entry to test that theory.

Interestingly when I connect the camera while turned off, the usb
subsystem fails to list the connection of any device at all.  Knowing
that Windows can see or at least use it when in this state (as a web
cam) makes me wonder as to why Linux does not register the connection of
the device.  I'd like to be able to get it to function as a web cam too,
but this makes it very hard to even know where to start.

Any help will be greatly appreciated.

--
Bob Minowicz



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Re: Creating a new map entry for an odd device

[David Brownell]

Bob Minowicz wrote:
> If this is the wrong forum for a request for help, I apologize.  please
> direct me to the appropriate mailing list.

The Linux-usb-users list would be better.


> I've recently obtained a Sampo Scream Cam DCE-310M.  ....
> 
> When I connect the camera (while turned on) under Linux, the USB
> subsystem finds a new device, but the hotplug usb agent fails to find a
> matching entry in the map.

So basically it needs some kind of driver.


> T:  Bus\x01 Lev\x01 Prnt\x01 Port\x01 Cnt\x02 Dev#= 16 Spd\x12  MxCh= 0
> D:  Ver= 1.00 Cls\0(>ifc ) Sub\0 Prot\0 MxPS= 8 #Cfgs=  1
> P:  Vendor\f25 ProdID\x0310 Rev= 3.00
> S:  Manufacturer=NetChip Technology
> S:  Product=NET2888 USB Interface Controller
> C:* #Ifs= 1 Cfg#= 1 Atr` MxPwrP0mA
> I:  If#= 0 Alt= 0 #EPs= 4 Clsÿ(vend.) Sub\0 Prot\0 Driver=(none)
> E:  Ad\x01(O) Atr\x02(Bulk) MxPS=   8 Ivl=0ms
> E:  Ad‚(I) Atr\x03(Int.) MxPS=   8 Ivl%5ms
> E:  Ad\x03(O) Atr\x02(Bulk) MxPS=  64 Ivl=0ms
> E:  Ad„(I) Atr\x02(Bulk) MxPS=  64 Ivl=0ms
> 
> Is there a way that I can compose a map entry for the hotplug usb agent
> from this information?  I believe the device may well function with the
> usb-storage module, but I need the map entry to test that theory.

No, you'd need more than a map entry.  Since it doesn't
say "storage", and in fact has too many endpoints to work
as a storage device, I doubt that driver could work.

On the other hand, since it comes up claiming it's
just a raw controller (and vendor 0c25 != NetChip),
maybe that device needs firmware too.

- Dave






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