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

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2012.11.28. 20:55 keltezéssel, Emilio López írta:
> 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.
>
I recently saw an im5x based android e-ink tablet from china, where the 
wifi and 3G chips could be powered-down and up using proprietary kernel 
ioctls (and yes, no source was provided for this kernel driver of course)

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