Galaxy S6 :: Charger Does Not Charge Any Other Phone

The adaptive fast charger that came with my phone works well with my galaxy s6. Fast charging works well and I can get up to 50% charge in about 25 mins. But the problem is it doesn't charge any other phone apart from galaxy s6. If I plug my htc one or lg g3 or any other phone (even blackberry), it will indicate its charging but won't add any juice. I've tried charging other phones for up to 30 mins, rather than charging the battery % will either stay where it is or sometimes drain. It can't even charge simple things like a modem or even a ps4 controller. I once plugged a ps4 controller and the charging light indicated, but to my surprise after 1 hour of charging it still was not able to add one bar to the battery. In fact if I plug a phone with 2% battery , after 20 mins of charging the phone dies.