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Date:   Mon, 13 Apr 2020 18:05:56 +0100
From:   Jonathan Cameron <jic23@kernel.org>
To:     Alexandru Ardelean <alexandru.ardelean@analog.com>
Cc:     <linux-iio@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <eugen.hristev@microchip.com>, <ludovic.desroches@microchip.com>
Subject: Re: [PATCH v2 1/2] iio: at91-sama5d2_adc: split
 at91_adc_current_chan_is_touch() helper
Message-ID: <20200413180556.20638f3b@archlinux>
In-Reply-To: <20200304084219.20810-1-alexandru.ardelean@analog.com>
References: <20200304084219.20810-1-alexandru.ardelean@analog.com>
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On Wed, 4 Mar 2020 10:42:18 +0200
Alexandru Ardelean <alexandru.ardelean@analog.com> wrote:

> This change moves the logic to check if the current channel is the
> touchscreen channel to a separate helper.
> This reduces some code duplication, but the main intent is to re-use this
> in the next patches.
> 
> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Eugen / Ludovic,

Have you had a chance to look at this series? 

Thanks,

Jonathan

> ---
> 
> This patchset continues discussion:
>    https://lore.kernel.org/linux-iio/20191023082508.17583-1-alexandru.ardelean@analog.com/
> Apologies for the delay.
> 
> Changelog v1 -> v2:
> * added patch 'iio: at91-sama5d2_adc: split at91_adc_current_chan_is_touch()
>   helper'
> * renamed at91_adc_buffer_postenable() -> at91_adc_buffer_preenable()
>   - at91_adc_buffer_postenable() - now just calls
>     iio_triggered_buffer_postenable() if the channel isn't the touchscreen
>     channel
> * renamed at91_adc_buffer_predisable() -> at91_adc_buffer_postdisable()
>   - at91_adc_buffer_predisable() - now just calls
>     iio_triggered_buffer_predisable() if the channel isn't the touchscreen
>     channel
> 
>  drivers/iio/adc/at91-sama5d2_adc.c | 31 +++++++++++++++---------------
>  1 file changed, 15 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/iio/adc/at91-sama5d2_adc.c b/drivers/iio/adc/at91-sama5d2_adc.c
> index a5c7771227d5..f2a74c47c768 100644
> --- a/drivers/iio/adc/at91-sama5d2_adc.c
> +++ b/drivers/iio/adc/at91-sama5d2_adc.c
> @@ -873,18 +873,24 @@ static int at91_adc_dma_start(struct iio_dev *indio_dev)
>  	return 0;
>  }
>  
> +static bool at91_adc_current_chan_is_touch(struct iio_dev *indio_dev)
> +{
> +	struct at91_adc_state *st = iio_priv(indio_dev);
> +
> +	return !!bitmap_subset(indio_dev->active_scan_mask,
> +			       &st->touch_st.channels_bitmask,
> +			       AT91_SAMA5D2_MAX_CHAN_IDX + 1);
> +}
> +
>  static int at91_adc_buffer_postenable(struct iio_dev *indio_dev)
>  {
>  	int ret;
>  	struct at91_adc_state *st = iio_priv(indio_dev);
>  
>  	/* check if we are enabling triggered buffer or the touchscreen */
> -	if (bitmap_subset(indio_dev->active_scan_mask,
> -			  &st->touch_st.channels_bitmask,
> -			  AT91_SAMA5D2_MAX_CHAN_IDX + 1)) {
> -		/* touchscreen enabling */
> +	if (at91_adc_current_chan_is_touch(indio_dev))
>  		return at91_adc_configure_touch(st, true);
> -	}
> +
>  	/* if we are not in triggered mode, we cannot enable the buffer. */
>  	if (!(indio_dev->currentmode & INDIO_ALL_TRIGGERED_MODES))
>  		return -EINVAL;
> @@ -906,12 +912,9 @@ static int at91_adc_buffer_predisable(struct iio_dev *indio_dev)
>  	u8 bit;
>  
>  	/* check if we are disabling triggered buffer or the touchscreen */
> -	if (bitmap_subset(indio_dev->active_scan_mask,
> -			  &st->touch_st.channels_bitmask,
> -			  AT91_SAMA5D2_MAX_CHAN_IDX + 1)) {
> -		/* touchscreen disable */
> +	if (at91_adc_current_chan_is_touch(indio_dev))
>  		return at91_adc_configure_touch(st, false);
> -	}
> +
>  	/* if we are not in triggered mode, nothing to do here */
>  	if (!(indio_dev->currentmode & INDIO_ALL_TRIGGERED_MODES))
>  		return -EINVAL;
> @@ -1886,14 +1889,10 @@ static __maybe_unused int at91_adc_resume(struct device *dev)
>  		return 0;
>  
>  	/* check if we are enabling triggered buffer or the touchscreen */
> -	if (bitmap_subset(indio_dev->active_scan_mask,
> -			  &st->touch_st.channels_bitmask,
> -			  AT91_SAMA5D2_MAX_CHAN_IDX + 1)) {
> -		/* touchscreen enabling */
> +	if (at91_adc_current_chan_is_touch(indio_dev))
>  		return at91_adc_configure_touch(st, true);
> -	} else {
> +	else
>  		return at91_adc_configure_trigger(st->trig, true);
> -	}
>  
>  	/* not needed but more explicit */
>  	return 0;