On 07/18/2013 11:21 PM, 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>
cc'd Dmitry and Linux-input.
If this goes through IIO as it is required for the rest of the series to
work then I will need an Ack from Dmitry.
> ---
> drivers/input/touchscreen/ti_am335x_tsc.c | 14 +++++++++++---
> 1 file changed, 11 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/input/touchscreen/ti_am335x_tsc.c b/drivers/input/touchscreen/ti_am335x_tsc.c
> index 0e9f02a..edc3d03 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;
>
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