Re: kvaser leaf and SocketCAN

[Marc Kleine-Budde <mkl@pengutronix.de>]

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On 04/22/2015 09:31 AM, max wrote:
> I'm trying to connect to a Kvaser Leaf Light V2 (product_id=15) adapter on 
> linux from python3.4, and for that purpose I've planned to use SocketCAN. 
> 
> I have downloaded and compiled the kvaser drivers v.5.9, my kernel is a 
> 3.13.0-49-generic, and according to the information I've fund so far, the 
> system requirements should all be met. 

Where do you download the driver from? I suggest to use a recent
mainline kernel. Support for the Kvaser Leaf v2 was added in v3.16 and a
_lot_ of bugfixes were added in later versions. Switching to a recent
ubuntu kernel (v3.19) is probably a good idea.

> And in fact, when I connect the adapter, the leaf kernel module is 
> correctly loaded (I see it in lsmod) and the /usr/sbin/leaf.sh is started 
> (I desume this from the fact that if I try to start it manually it tells me 
> it has already been started), and also the /dev/leaf0 device is created. 

A /dev/leaf0 is not created by the mainline driver...

> So far so good. But what's next? What I have understood is that at this 
> point there should be the kvaser_usb module that comes into play for 
> mapping the device to a network interface that can be brought up and used 
> by SocketCAN. 
> 
> But the kvaser_usb module is not loaded automatically, and if I modprobe it 
> manually, nothing seems to happen.
> 
> Here is what goes on in the kernel log when connecting the adapter:
> 
> [46464.671385] usb 3-2: new high-speed USB device number 4 using xhci_hcd
> [46464.689616] usb 3-2: New USB device found, idVendor=0bfd, idProduct=0120
> [46464.689627] usb 3-2: New USB device strings: Mfr=0, Product=2, 
> SerialNumber=0
> [46464.689633] usb 3-2: Product: Kvaser Leaf Light v2
> [46467.738639] usbcore: registered new interface driver leaf
> 
> And this when I modprobe the kvaser_usb module:
> 
> [46545.271520] usbcore: registered new interface driver kvaser_usb
> 
> If I invert the order of the two operations, it is exactly the same. I've 
> also tryed with and without an actual can device connected to the other end 
> of the adapter, but this doesn't change anything either.
> 
> So, it looks I am still missing something... Can anyone tell me what 
> further steps are necessary to finally get a can0 interface to show up?
> 
> Thank's a lot for any hint pointing me to the right direction...

Use a recent mainline kernel, then everything should work out of the
box, without any external drivers and manual module loading.

Marc
-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
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