[Arm-netbook] irony: requirement for 100 A10 PCBs with GPIO-controlled power-up on USB 5V rail, or a Mini-PCIe socket

[Emilio López]

El 28/11/12 15:41, luke.leighton escribió:
> hi folks,
> 
> part of the reason why things are very busy for me at the moment is
> because i've started a new job, and - irony - they need a small
> low-cost unit, qty 100, with 3G (HSDPA) and WIFI (802.11bgn).
> 
> but the requirements are *very* specific: the WIFI and 3G, which are
> usually USB-powered, typically crash (for whatever reason) but they're
> often 5V powered and you can't shut them down.
> 
> so what they need to be able to do is to flick a couple of GPIO pins
> and power off - completely - the USB bus 5V rail.  or, if the unit has
> a Mini PCIe slot for 3G, they need to be able to pull down the 3.3v
> and 1.5v power, and back up again.
> 
> it's the basis of a reliable router box, basically.  oh - they also
> need Ethernet.
> 
> so - irony, as the timescales are short, i'm looking at the hackberry,
> and yes tom the cubieboard: i need to find absolutely anything where
> the USB can be completely powered down, *without* power-cycling.

I'm pretty sure that's how the USB WiFi chip operates on A10 tablets,
when you unload the module, the usb power for the device is disconnected.

Look for sw_usb_* on
drivers/net/wireless/rtl8192cu/os_dep/linux/usb_intf.c for an example.

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