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, now driver requires
interrupt to process the ADC samples, so enable shared IRQ flag bit for
touchscreen.
This patch is based on work in the 3.2 tree by TI
Original Author is Patil Rachna
Signed-off-by: Zubair Lutfullah <zubair.lutfullah@xxxxxxxxx>
---
drivers/input/touchscreen/ti_am335x_tsc.c | 16 ++++++++++++----
1 file changed, 12 insertions(+), 4 deletions(-)
diff --git a/drivers/input/touchscreen/ti_am335x_tsc.c b/drivers/input/touchscreen/ti_am335x_tsc.c
index 0e9f02a..cf56cae 100644
--- a/drivers/input/touchscreen/ti_am335x_tsc.c
+++ b/drivers/input/touchscreen/ti_am335x_tsc.c
@@ -260,8 +260,16 @@ 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 interrupt is used by ADC,
+ * hence return from touchscreen IRQ handler if FIFO1
+ * threshold interrupt occurred.
+ */
+ if (status & IRQENB_FIFO1THRES)
+ return IRQ_NONE;
+ else if (status & IRQENB_FIFO0THRES) {
titsc_read_coordinates(ts_dev, &x, &y, &z1, &z2);
if (ts_dev->pen_down && z1 != 0 && z2 != 0) {
@@ -315,7 +323,7 @@ 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) );
am335x_tsc_se_update(ts_dev->mfd_tscadc);
return IRQ_HANDLED;
}
@@ -389,7 +397,7 @@ static int titsc_probe(struct platform_device *pdev)
}
err = request_irq(ts_dev->irq, titsc_irq,
- 0, pdev->dev.driver->name, ts_dev);
+ IRQF_SHARED, pdev->dev.driver->name, ts_dev);
if (err) {
dev_err(&pdev->dev, "failed to allocate irq.\n");
goto err_free_mem;
--
1.7.9.5
--
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
