[pvrusb2] Non-root access to control pvrusb2 driver

[G Mc.Pherson]

Hi Folks,

I was tooling around with sysfsutils and noticed that it's possible to 
change the ownership of entries in the /sys subdirectory. By adding the
following sample entries into /etc/sysfs.conf:

owner class/pvrusb2/sn-8206665/ctl_freq_table_channel/cur_val=user:user
owner class/pvrusb2/sn-8206665/ctl_freq_table_value/cur_val=user:user
owner class/pvrusb2/sn-8206665/ctl_channel/cur_val=user:user
owner class/pvrusb2/sn-8206665/ctl_frequency/cur_val=user:user
owner class/pvrusb2/sn-8206665/ctl_input/cur_val=user:user
owner class/pvrusb2/sn-8206665/ctl_mute/cur_val=user:user
owner class/pvrusb2/sn-8206665/ctl_volume/cur_val=user:user

* Note: Change user:user to your user name

It's possible control the volume, channel and input controls without 
having to switch to root. So, as a non-root user, it's possible to:

echo false > /sys/class/pvrusb2/sn-8206665/ctl_mute/cur_val
echo 58980 > /sys/class/pvrusb2/sn-8206665/ctl_volume/cur_val
echo composite > /sys/class/pvrusb2/sn-8206665/ctl_input/cur_val

I realize most people are using MythTV to interact with their devices, 
but I thought this information might be useful to those of us who have 
hacked together our own little scripts to watch/record TV shows.

For a complete list of these controls, use the following command:

find /sys/class/pvrusb2/*/* | grep cur_val

Regards,
Gord