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Are there any USB wireless adapters out there that support 802.11g in AP mode under Linux? Binary drivers are a no-go, as I plan to use it with an ARM device. Support for WPA would be very desirable as well.

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Try a D-Link device. They have an excellent record of using Atheros chipsets with superb linux compatibility.

Try looking on Linux-Drivers.org for compatible hardware.

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I looked at the D-link products at linuxwireless.org/en/users/Drivers/ath9k/products/… but they all seem to be PCMCIA or PCI interfaces - unfortunately the device I plan to use it with has only a USB interface. – bdonlan Jul 15 '09 at 23:43
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I have a TP-Link device with an Atheros chipset (which I believe all their devices use). Plug 'n play :)

Looks like I was wrong on this one (see comments)

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And it supports access point mode under linux? – bdonlan Jul 16 '09 at 0:54
I've only used it once as an AP to test, but it seemed to work just fine. – Ehtyar Jul 16 '09 at 1:21
Your asking made me second guess myself, so I dragged out the adapter and I couldn't get it into master mode. I'll let you know if I manage it, but at this stage it looks like I was wrong. Sorry. – Ehtyar Jul 16 '09 at 1:37
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I'm not sure about non-x86 support, but I could get a ralink PCI card to work in Master Mode very easily (after a lot of previous attempts). I've posted the details in my blog.

I know that USB ralink cards are more trickier to work in Master Mode, and I don't know the current status for USB cards, but you might check the rt2x00 project forum.

So, besides prism54, you might also try ralink (rt2x00 driver) devices.

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It appears that the Linksys WUSB54G is supported by prism54, which claims to support AP mode, so I'll give that a shot. Moshen pointed me to linux-drivers.org, which pointed me in the right direction.

Update:

The WUSB54G has multiple variants, not all of which are supported by prism54. I ended up finding a Netgear WG121, which worked nicely through prism54.

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