Re: [PATCH v2 2/8] iio: at91-sama5d2_adc: pass ref to IIO device via param for int function

Jonathan Cameron
2020-05-16T17:15:29Z

On Thu, 14 May 2020 16:17:04 +0300
Alexandru Ardelean <alexandru.ardelean@analog.com> wrote:

> Since there will be some changes to how iio_priv_to_dev() is implemented,
> it could be that the helper becomes a bit slower, as it will be hidden away
> in the IIO core.
>
> For this driver, the IIO device can be passed directly as a parameter to
> the at91_adc_no_pen_detect_interrupt() function, thus making it immune to
> the change of iio_priv_to_dev().
> The function gets called in an interrupt context.
>
> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>

Looks sensible to me. We could get the state structure from the
iio_dev inside that function, but then it would be different from the
pen version, so I think what you have here is probably best option.

Jonathan

> ---
> drivers/iio/adc/at91-sama5d2_adc.c | 7 +++----
> 1 file changed, 3 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/iio/adc/at91-sama5d2_adc.c b/drivers/iio/adc/at91-sama5d2_adc.c
> index 9abbbdcc7420..822b8782acba 100644
> --- a/drivers/iio/adc/at91-sama5d2_adc.c
> +++ b/drivers/iio/adc/at91-sama5d2_adc.c
> @@ -1275,10 +1275,9 @@ static void at91_adc_pen_detect_interrupt(struct at91_adc_state *st)
> st->touch_st.touching = true;
> }
>
> -static void at91_adc_no_pen_detect_interrupt(struct at91_adc_state *st)
> +static void at91_adc_no_pen_detect_interrupt(struct iio_dev *indio_dev,
> + struct at91_adc_state *st)
> {
> - struct iio_dev *indio_dev = iio_priv_to_dev(st);
> -
> at91_adc_writel(st, AT91_SAMA5D2_TRGR,
> AT91_SAMA5D2_TRGR_TRGMOD_NO_TRIGGER);
> at91_adc_writel(st, AT91_SAMA5D2_IDR, AT91_SAMA5D2_IER_NOPEN |
> @@ -1318,7 +1317,7 @@ static irqreturn_t at91_adc_interrupt(int irq, void *private)
> at91_adc_pen_detect_interrupt(st);
> } else if ((status & AT91_SAMA5D2_IER_NOPEN)) {
> /* nopen detected IRQ */
> - at91_adc_no_pen_detect_interrupt(st);
> + at91_adc_no_pen_detect_interrupt(indio, st);
> } else if ((status & AT91_SAMA5D2_ISR_PENS) &&
> ((status & rdy_mask) == rdy_mask)) {
> /* periodic trigger IRQ - during pen sense */