Re: [PATCH 3/4] input: ti_tsc: Enable shared IRQ for TSC and add overrun, underflow checks

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 <redacted>
---
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;
+		}

+		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));