On Wed, May 12, 2010 at 2:30 PM, Mark Brown
<broonie@xxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
> On Wed, May 12, 2010 at 01:47:12PM +0200, Manuel Lauss wrote:
>
>> I'm playing with the GPIO interface on a WM9712G, specifically GPIO1
>> and 2 of the chip.
>> However I'm unable to get the chip to toggle any of these pins.
>
>> Setting a pin with
>> wm97xx_set_gpio(wm, WM97XX_GPIO_1, WM97XX_GPIO_HIGH);
>
>> reads back 0x0820 from GPIO status reg, sets bit 1,writes back 0x1044 (<<1),
>> but a read following immediately after yields 0x0820 again, and the pin
>> never changes.
>
>> Am I missing something?
>
> The WM9712 does not support this feature. It only supports setting the
> GPIO status by use of AC'97 slot 12 for which there's currently no
> standard glue on Linux. Setting slot 12 needs to be done in the AC'97
> controller.
Wonderful. Thanks for the info.
Manuel Lauss
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