[mythtv-users] WinTV-HVR1100 and Nova-TD Stick udev rules

Hika van den Hoven hikavdh at gmail.com
Sat Mar 8 12:01:45 UTC 2014

Hoi Stephen,

Saturday, March 8, 2014, 5:40:28 AM, you wrote:

> On Sat, 8 Mar 2014 14:30:04 +1100, you wrote:

>>Hi Everyone,
>>I've happily been running MythTV with an old Hauppauge HVR1100 pci
>>card for a couple of years and have just purchased a Nova-TD USB dual
>>tuner.  I'm trying to set up appropriate udev rules so the adapter
>>numbers don't change.
>>From reading numerous other threads, my understanding is that I want
>>to set up a symlink to each of the adapters using udev rules to find
>>the device.
>>$ udevadm info -q path -n /dev/dvb/adapter2/frontend0 --attribute-walk
>>Udevadm info starts with the device specified by the devpath and then
>>walks up the chain of parent devices. It prints for every device
>>found, all possible attributes in the udev rules key format.
>>A rule to match, can be composed by the attributes of the device
>>and the attributes from one single parent device.
>>  looking at device
>>    KERNEL=="dvb2.frontend0"
>>    SUBSYSTEM=="dvb"
>>    DRIVER==""
>>  looking at parent device '/devices/pci0000:00/0000:00:1e.0/0000:02:0c.2':
>>    KERNELS=="0000:02:0c.2"
>>    SUBSYSTEMS=="pci"
>>    DRIVERS=="cx88-mpeg driver manager"
>>    ATTRS{irq}=="20"
>>    ATTRS{subsystem_vendor}=="0x0070"
>>    ATTRS{broken_parity_status}=="0"
>>    ATTRS{class}=="0x048000"
>>    ATTRS{consistent_dma_mask_bits}=="32"
>>    ATTRS{dma_mask_bits}=="32"
>>    ATTRS{local_cpus}=="ff"
>>    ATTRS{device}=="0x8802"
>>    ATTRS{msi_bus}==""
>>    ATTRS{local_cpulist}=="0-7"
>>    ATTRS{vendor}=="0x14f1"
>>    ATTRS{subsystem_device}=="0x9800"
>>    ATTRS{d3cold_allowed}=="1"
>>  looking at parent device '/devices/pci0000:00/0000:00:1e.0':
>>    KERNELS=="0000:00:1e.0"
>>    SUBSYSTEMS=="pci"
>>    DRIVERS==""
>>    ATTRS{irq}=="0"
>>    ATTRS{subsystem_vendor}=="0x0000"
>>    ATTRS{broken_parity_status}=="0"
>>    ATTRS{class}=="0x060400"
>>    ATTRS{consistent_dma_mask_bits}=="32"
>>    ATTRS{dma_mask_bits}=="32"
>>    ATTRS{local_cpus}=="ff"
>>    ATTRS{device}=="0x244e"
>>    ATTRS{msi_bus}=="1"
>>    ATTRS{local_cpulist}=="0-7"
>>    ATTRS{vendor}=="0x8086"
>>    ATTRS{subsystem_device}=="0x0000"
>>    ATTRS{d3cold_allowed}=="0"
>>  looking at parent device '/devices/pci0000:00':
>>    KERNELS=="pci0000:00"
>>    SUBSYSTEMS==""
>>    DRIVERS==""
>>I can generate a rule:
>>KERNEL=="dvb?.frontend?", SUBSYSTEM=="dvb", ATTRS{device}=="0x8802",
>>But this creates:
>>$ ls -l /dev/dvb
>>total 0
>>drwxr-xr-x 2 root root 120 Mar  8 13:03 adapter0
>>drwxr-xr-x 2 root root 120 Mar  8 13:03 adapter1
>>drwxr-xr-x 2 root root 120 Mar  8 13:03 adapter2
>>lrwxrwxrwx 1 root root   8 Mar  8 13:25 HVR1100 -> adapter2/frontend0
>>While this allows the card to be configured within Myth, it fails to
>>scan channels correctly.  My understanding is that the symlink should
>>just point to the adapter, i.e.
>>lrwxrwxrwx 1 root root   8 Mar  8 13:25 HVR1100 -> adapter2
>>Manually setting this up allows the card to be configured and channels
>>scanned with EIT as the video source.
>>$ udevadm info -q path -n /dev/dvb/adapter2 --attribute-walk
>>device node has wrong file type
>>So I can't see how to generate the udev rule for the adapter, rather
>>than just for frontend0.
>>Other info:
>>OS: Mythbuntu 12.04, kernel 3.11.0-18-generic
>>MythTV Version : v0.27-178-g6b14852
>>MythTV Branch : fixes/0.27
>>(the next problem will be how to generate rules for the USB device,
>>which has two tuners and I can't see anything to differentiate them
>>based on udevadm output, but one step at a time).
>>Thanks very much,

> My Nova TD PCI cards are easy to fix the adapter numbers for, and my
> understanding is that the PCI card is virtually the same as the USB
> version, just with a PCI-USB chip on the front.  Just create a file
> such as options-dvb.conf in /etc/modprobe.d and put something like
> this in it:

>   options dvb_usb_dib0700 adapter_nr=0,1

> As long as you do not have any other DVB-T tuners using the dib0700
> driver, then that will fix the numbers for the Nova TD tuners.  There
> is no need to use the complicated udev rules when the tuners will
> accept the adapter_nr option and you do not have multiple tuners using
> the same driver.

> I believe that the enumeration order is fixed for the two tuners on
> the same device, so they should not swap around using the adapter_nr
> option.  But even if they do, they are identical tuners so it should
> not cause any trouble unless you have given them different aerial
> connections.

> Other adapters will get the unused numbers in order, from the lowest
> available number upwards, but will ignore the manually assigned
> numbers.

> Finding the name of the driver used for a tuner can be a bit of a pain
> - there are usually clues in dmesg and the other log files, but often
> the exact driver name is not in the log messages.
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Daryl added an item to the wiki about this. Try something like:

SUBSYSTEM=="dvb", ATTRS{device}=="0x8852", PROGRAM="/bin/sh -c 'K=%k;
K=$${K#dvb}; printf dvb/adapterHP1250/%%s $${K#*.}; exit 0'", SYMLINK+="%c"

on one line.

Tot mails,
  Hika                            mailto:hikavdh at gmail.com

"Zonder hoop kun je niet leven
Zonder leven is er geen hoop
Het eeuwige dilemma
Zeker als je hoop moet vernietigen om te kunnen overleven!"

De lerende Mens

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