On Tue, Nov 15, 2005 Felix Domke wrote: > > Some frontends support blindscanning, but require heavy software support > for this (Fujitsu mb86a15 for example). Such code is not really suitable > in the kernel (it sleeps, includes complicated algorithms etc.), so i > think the best would be to make it a userspace library with frontend > specific private ioctls, providing more or less direct register (or even > i2c) access. What do you think? > > Blindscanning on DVB-T would require the same - most demods can do this > way better than any generic API could handle. I would prefer if we could find a generic scanning API. Doesn't it work that way: - program PLL for frequency to scan - program demod for scanning - poll some demod register until it signals completion (or use irq if available) - pass result to userspace (e.g. event, wake up poll(2), ioctl) - get frequency step for reprogramming PLL from driver - repeat I know the driver software from the fe vendors often uses floating point and makes it look complicated, but IMHO it doesn't have to. Johannes
