On Wed, May 20, 2015 at 02:54:35PM -0700, Greg Wilson-Lindberg wrote: > Hi Michael, > I've applied your patch and the mouse clicks now work mostly, and I even saw one touch screen click that worked. > This is not promising. Perhaps you are accessing the ADC to quickly for it to be available for the touchscreen. > I only need to read the ADC infrequently so I guess I'll set it up to enable when I need to read the ADC and then disable again. > > Do you know if I can set up the context, device and channels and then just enable the channels, do the scan, and then disable the channels until I need them again, without tearing down the channels, device and context? > I think you can just enable and disable the buffer. To disable: echo 0 > /sys/bus/iio/devices/iio:device0/buffer/disable or http://lxr.free-electrons.com/source/drivers/staging/iio/Documentation/generic_buffer.c#L337 To enable: echo 1 > /sys/bus/iio/devices/iio:device0/buffer/enable or http://lxr.free-electrons.com/source/drivers/staging/iio/Documentation/generic_buffer.c#L280 > Regards, > Greg > > > > -----Original Message----- > > From: Michael Welling [mailto:mwelling79@xxxxxxxxx] On Behalf > > Of Michael Welling > > Sent: Tuesday, May 19, 2015 5:35 PM > > To: Greg Wilson-Lindberg > > Cc: linux-iio@xxxxxxxxxxxxxxx > > Subject: Re: BBB touch screen and ADC interactions > > > > On Tue, May 19, 2015 at 05:16:46PM -0700, Greg Wilson-Lindberg wrote: > > > > > > I would be happy to test the patch, better than what I was > > going to try. > > > > > > -Greg > > > > Below is the simple workaround patch that I used to eliminate > > the repeated release events that were occurring without > > touching the screen. > > > > See if it helps. > > > > diff --git a/drivers/input/touchscreen/ti_am335x_tsc.c > > b/drivers/input/touchscreen/ti_am335x_tsc.c > > index 191a1b8..f876097 100644 > > --- a/drivers/input/touchscreen/ti_am335x_tsc.c > > +++ b/drivers/input/touchscreen/ti_am335x_tsc.c > > @@ -281,13 +281,11 @@ static irqreturn_t titsc_irq(int irq, void *dev) > > if (status & IRQENB_PENUP) { > > fsm = titsc_readl(ts_dev, REG_ADCFSM); > > if (fsm == ADCFSM_STEPID) { > > - ts_dev->pen_down = false; > > input_report_key(input_dev, BTN_TOUCH, 0); > > input_report_abs(input_dev, ABS_PRESSURE, 0); > > input_sync(input_dev); > > - } else { > > - ts_dev->pen_down = true; > > } > > + ts_dev->pen_down = false; > > irqclr |= IRQENB_PENUP; > > } > > > > -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
