linux-kernel - Re: [PATCH 03/15] input: ti_tsc: Enable shared IRQ for TSC

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Date:	Sat, 20 Jul 2013 11:57:29 +0100
From:	Jonathan Cameron <jic23@...nel.org>
To:	Zubair Lutfullah <zubair.lutfullah@...il.com>
CC:	jic23@....ac.uk, gregkh@...uxfoundation.org,
	linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
	koen@...inion.thruhere.net, Torokhov <dmitry.torokhov@...il.com>,
	"linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>
Subject: Re: [PATCH 03/15] input: ti_tsc: Enable shared IRQ for TSC

On 07/18/2013 11:21 PM, Zubair Lutfullah wrote:
> From: "Patil, Rachna" <rachna@...com>
> 
> 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@...com>
> Acked-by: Vaibhav Hiremath <hvaibhav@...com>
> Signed-off-by: Zubair Lutfullah <zubair.lutfullah@...il.com>
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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