* Zubair Lutfullah | 2013-08-13 17:48:18 [+0100]:
>Enable shared IRQ to allow ADC to share IRQ line from
>parent MFD core. Only FIFO0 IRQs are for TSC and handled
>on the TSC side.
>
>Patch also adds overrun and underflow irq handlers.
>
>Russ Dill (TI) worked on overrun and underflow handlers.
>Rachna Patil (TI) laid ground work for shared IRQ.
>
>Signed-off-by: Zubair Lutfullah <zubair.lutfullah@xxxxxxxxx>
>---
> drivers/input/touchscreen/ti_am335x_tsc.c | 37 +++++++++++++++++++++++++----
> include/linux/mfd/ti_am335x_tscadc.h | 2 ++
> 2 files changed, 34 insertions(+), 5 deletions(-)
>
>diff --git a/drivers/input/touchscreen/ti_am335x_tsc.c b/drivers/input/touchscreen/ti_am335x_tsc.c
>index 766bc7e..9c114b2 100644
>--- a/drivers/input/touchscreen/ti_am335x_tsc.c
>+++ b/drivers/input/touchscreen/ti_am335x_tsc.c
>@@ -256,14 +256,39 @@ static irqreturn_t titsc_irq(int irq, void *dev)
> {
> struct titsc *ts_dev = dev;
> struct input_dev *input_dev = ts_dev->input;
>- unsigned int status, irqclr = 0;
>+ unsigned int status, irqclr = 0, config = 0;
> unsigned int x = 0, y = 0;
> unsigned int z1, z2, z;
> 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. Handle FIFO0 IRQs here only
>+ * and check if any IRQs left in case both fifos interrupt.
>+ * If any irq left, return none, else return handled.
>+ */
>+ if ((status & IRQENB_FIFO0OVRRUN) ||
>+ (status & IRQENB_FIFO0UNDRFLW)) {
>+
>+ config = titsc_readl(ts_dev, REG_CTRL);
>+ config &= ~(CNTRLREG_TSCSSENB);
>+ titsc_writel(ts_dev, REG_CTRL, config);
>+
>+ if (status & IRQENB_FIFO0UNDRFLW) {
>+ titsc_writel(ts_dev, REG_IRQSTATUS,
>+ (status | IRQENB_FIFO0UNDRFLW));
>+ irqclr |= IRQENB_FIFO0UNDRFLW;
>+ } else {
>+ titsc_writel(ts_dev, REG_IRQSTATUS,
>+ (status | IRQENB_FIFO0OVRRUN));
>+ irqclr |= IRQENB_FIFO0OVRRUN;
>+ }
You don't do anything on overflow / underflow. Is this due to the fact
once enabled for FIFO1 it also triggers for FIFO0?
>+ titsc_writel(ts_dev, REG_CTRL,
>+ (config | CNTRLREG_TSCSSENB));
>+ } else if (status & IRQENB_FIFO0THRES) {
> titsc_read_coordinates(ts_dev, &x, &y, &z1, &z2);
>
> if (ts_dev->pen_down && z1 != 0 && z2 != 0) {
>@@ -317,9 +342,11 @@ static irqreturn_t titsc_irq(int irq, void *dev)
> }
>
> if (irqclr) {
>- titsc_writel(ts_dev, REG_IRQSTATUS, irqclr);
>+ titsc_writel(ts_dev, REG_IRQSTATUS, (status | irqclr));
Shouldn't FIFO1UNDRFLW & OVRRUN be handled by the adc driver? Why do you
or the unhandled bits as well here?
> am335x_tsc_se_set(ts_dev->mfd_tscadc, ts_dev->step_mask);
>- return IRQ_HANDLED;
>+ status = titsc_readl(ts_dev, REG_IRQSTATUS);
>+ if (status == false)
>+ return IRQ_HANDLED;
And why this? If you something you handled it, if you didn't you return
NONE. Why does it depend on REG_IRQSTATUS?
> }
> return IRQ_NONE;
> }
Sebastian
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