On Sun, Aug 04, 2013 at 12:08:11PM +0100, Jonathan Cameron wrote:
> On 07/27/13 00:51, Zubair Lutfullah wrote:
> > From: "Patil, Rachna" <rachna@xxxxxx>
> >
> > Touchscreen and ADC share the same IRQ line from parent MFD core.
> > Previously only Touchscreen was interrupt based.
> > With continuous mode support added in ADC driver, driver requires
> > interrupt to process the ADC samples, so enable shared IRQ flag bit for
> > touchscreen.
> >
> > Signed-off-by: Patil, Rachna <rachna@xxxxxx>
> > Acked-by: Vaibhav Hiremath <hvaibhav@xxxxxx>
> > Signed-off-by: Zubair Lutfullah <zubair.lutfullah@xxxxxxxxx>
> > Acked-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> I'd rather this went via input independent of the other patch
> (if not there all that will happen is one or other driver will
> fail to probe if both are attempted?)
>
> Can take it through IIO but only with a Dmitry Ack.
>
> > ---
> > drivers/input/touchscreen/ti_am335x_tsc.c | 18 ++++++++++++++----
> > 1 file changed, 14 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/input/touchscreen/ti_am335x_tsc.c b/drivers/input/touchscreen/ti_am335x_tsc.c
> > index e1c5300..68d1250 100644
> > --- a/drivers/input/touchscreen/ti_am335x_tsc.c
> > +++ b/drivers/input/touchscreen/ti_am335x_tsc.c
> > @@ -260,8 +260,18 @@ static irqreturn_t titsc_irq(int irq, void *dev)
> > unsigned int fsm;
> >
> > status = titsc_readl(ts_dev, REG_IRQSTATUS);
> > - if (status & IRQENB_FIFO0THRES) {
> > -
> > + /*
> > + * ADC and touchscreen share the IRQ line.
> > + * FIFO1 threshold, FIFO1 Overrun and FIFO1 underflow
> > + * interrupts are used by ADC,
> > + * hence return from touchscreen IRQ handler if FIFO1
> > + * related interrupts occurred.
> > + */
> > + if ((status & IRQENB_FIFO1THRES) ||
> > + (status & IRQENB_FIFO1OVRRUN) ||
> > + (status & IRQENB_FIFO1UNDRFLW))
> > + return IRQ_NONE;
> > + else if (status & IRQENB_FIFO0THRES) {
What happens if both parts have data at the same time? Can both
IRQENB_FIFO1THRES and IRQENB_FIFO0THRES be signalled? What will happen
in this case?
Thanks.
--
Dmitry
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