linux-kernel - Re: [PATCH v2 1/2] iio: at91-sama5d2_adc: split at91_adc_current_chan_is

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Date:   Tue, 14 Apr 2020 12:22:45 +0000
From:   <Eugen.Hristev@...rochip.com>
To:     <jic23@...nel.org>, <alexandru.ardelean@...log.com>
CC:     <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <Ludovic.Desroches@...rochip.com>
Subject: Re: [PATCH v2 1/2] iio: at91-sama5d2_adc: split
 at91_adc_current_chan_is_touch() helper

On 13.04.2020 20:05, Jonathan Cameron wrote:
> On Wed, 4 Mar 2020 10:42:18 +0200
> Alexandru Ardelean <alexandru.ardelean@...log.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@...log.com>
> Eugen / Ludovic,
> 
> Have you had a chance to look at this series?

Hi Jonathan,

Does the patch apply correctly for you ?
I will try to test it , if I manage to apply it.
I can only test the ADC though because at this moment I do not have a 
touchscreen at disposal.

Meanwhile, the code looks good for me,

Reviewed-by: Eugen Hristev <eugen.hristev@...rochip.com>

By the way, I do not know if my two pending patches on this driver will 
conflict or not.

Eugen

> 
> 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;
>