wm97xx_read_aux_adc() for battery & pen down?

[Wolfram Sang <w.sang@pengutronix.de>]

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Hi,

I have one question I got while hacking on this cheap tablet thingie I don't
have schematics or documentation for. It uses a WM9715 for (at least) touch and
battery-status, but I need the following dirty hack for 3.0-rc4 in
wm97xx_read_aux_adc():

...
-       if (!(*sample & WM97XX_PEN_DOWN)) {
+       /* HACK! Disable check for battery channel on Jaytech PID7901 */
+       if ((adcsel != 0x6000) && !(*sample & WM97XX_PEN_DOWN)) {
                wm->pen_probably_down = 0;
                return RC_PENUP;
        }

        return RC_VALID;
}

So, it uses WM97XX_AUX_ID3 as the battery channel which never sets PEN_DOWN. As
a result, I always see timeouts when reading the current voltage (without the
patch). My question is: How to avoid this hack? Did I forget to configure
something somewhere? I read through the wm9715-docs and the driver source, yet
I think I missed something (or the current implementation cannot work?).

Thanks,

   Wolfram

-- 
Pengutronix e.K.                           | Wolfram Sang                |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

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