Linksys by Cisco does it has wifi?

If the manual doesn't mention setting up wireless then it's presumably a plain ADSL Gateway which would require the addition of a wireless access point in order to do what you want.

I have a Linksys combo like that and never use it because it's an extra hassle to set up two units together rather than a simple integrated unit (and it uses more power). So I would recommend buying an integrated ADSL Wireless Router.