On 09/01/13 12:17, Zubair Lutfullah wrote:
> 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.
>
> Step mask would be updated from cached variable only previously.
> In rare cases when both TSC and ADC are used, the cached
> variable gets mixed up.
> The step mask is written with the required mask every time.
>
> Rachna Patil (TI) laid ground work for shared IRQ.
>
> Signed-off-by: Zubair Lutfullah <zubair.lutfullah@xxxxxxxxx>
Whilst I would have prefered an mfd under these drivers and elegant handling
of the interrupts, I guess if this works it is at least not terribly invasive.
However, this does need an Ack from Dmitry before I can take it (or for
Dmitry to take it himself?)
> ---
> drivers/input/touchscreen/ti_am335x_tsc.c | 12 +++++++++---
> 1 file changed, 9 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/input/touchscreen/ti_am335x_tsc.c b/drivers/input/touchscreen/ti_am335x_tsc.c
> index e1c5300..24e625c 100644
> --- a/drivers/input/touchscreen/ti_am335x_tsc.c
> +++ b/drivers/input/touchscreen/ti_am335x_tsc.c
> @@ -52,6 +52,7 @@ struct titsc {
> u32 config_inp[4];
> u32 bit_xp, bit_xn, bit_yp, bit_yn;
> u32 inp_xp, inp_xn, inp_yp, inp_yn;
> + u32 step_mask;
> };
>
> static unsigned int titsc_readl(struct titsc *ts, unsigned int reg)
> @@ -196,7 +197,8 @@ static void titsc_step_config(struct titsc *ts_dev)
>
> /* The steps1 … end and bit 0 for TS_Charge */
> stepenable = (1 << (end_step + 2)) - 1;
> - am335x_tsc_se_set(ts_dev->mfd_tscadc, stepenable);
> + ts_dev->step_mask = stepenable;
> + am335x_tsc_se_set(ts_dev->mfd_tscadc, ts_dev->step_mask);
> }
>
> static void titsc_read_coordinates(struct titsc *ts_dev,
> @@ -260,6 +262,10 @@ static irqreturn_t titsc_irq(int irq, void *dev)
> unsigned int fsm;
>
> status = titsc_readl(ts_dev, REG_IRQSTATUS);
> + /*
> + * ADC and touchscreen share the IRQ line.
> + * FIFO1 interrupts are used by ADC. Handle FIFO0 IRQs here only
> + */
> if (status & IRQENB_FIFO0THRES) {
>
> titsc_read_coordinates(ts_dev, &x, &y, &z1, &z2);
> @@ -316,7 +322,7 @@ static irqreturn_t titsc_irq(int irq, void *dev)
>
> if (irqclr) {
> titsc_writel(ts_dev, REG_IRQSTATUS, irqclr);
> - am335x_tsc_se_update(ts_dev->mfd_tscadc);
> + am335x_tsc_se_set(ts_dev->mfd_tscadc, ts_dev->step_mask);
> return IRQ_HANDLED;
> }
> return IRQ_NONE;
> @@ -389,7 +395,7 @@ 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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