How to set a scan with ath9k driver

[Francisco Cuesta]

Hello,

I would like to know whether someone might point out where a  sta-mode
scan in ath9k driver is carried out. I mean, if I want to perform such
a scan, I have seen that hostapd or wpa supplicant requests the driver
through nl80211 interface such a petition. But I cannot understand how
this petition is made, in terms of assigning the parameters of the
scan. How or where is the frequency or channel imposed for such a
scan?

I really appreciate any hint,

Regards,