Re: [PATCH] iio: tcs3414: fix iio_triggered_buffer_{pre,post}enable positions

[Jonathan Cameron <jic23@jic23.retrosnub.co.uk>]

On Wed, 29 May 2019 17:20:40 +0300
Alexandru Ardelean <alexandru.ardelean@analog.com> wrote:

> The iio_triggered_buffer_{predisable,postenable} functions attach/detach
> the poll functions.
> 
> For the predisable hook, the disable code should occur before detaching
> the poll func, and for the postenable hook, the poll func should be
> attached before the enable code.
> 
> The driver was slightly reworked. The preenable hook was moved to the
> postenable, to add some symmetry to the postenable/predisable part.
> 
> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>

Looks fine to me, but I'm looking for a tested-by/ack from Peter.

Thanks,

Jonathan

> ---
>  drivers/iio/light/tcs3414.c | 30 ++++++++++++++++++++----------
>  1 file changed, 20 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/iio/light/tcs3414.c b/drivers/iio/light/tcs3414.c
> index 205e5659ce6b..ae70bf89be70 100644
> --- a/drivers/iio/light/tcs3414.c
> +++ b/drivers/iio/light/tcs3414.c
> @@ -243,32 +243,42 @@ static const struct iio_info tcs3414_info = {
>  	.attrs = &tcs3414_attribute_group,
>  };
>  
> -static int tcs3414_buffer_preenable(struct iio_dev *indio_dev)
> +static int tcs3414_buffer_postenable(struct iio_dev *indio_dev)
>  {
>  	struct tcs3414_data *data = iio_priv(indio_dev);
> +	int ret;
> +
> +	ret = iio_triggered_buffer_postenable(indio_dev);
> +	if (ret)
> +		return ret;
>  
>  	data->control |= TCS3414_CONTROL_ADC_EN;
> -	return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
> +	ret = i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
>  		data->control);
> +	if (ret)
> +		iio_triggered_buffer_predisable(indio_dev);
> +
> +	return ret;
>  }
>  
>  static int tcs3414_buffer_predisable(struct iio_dev *indio_dev)
>  {
>  	struct tcs3414_data *data = iio_priv(indio_dev);
> -	int ret;
> -
> -	ret = iio_triggered_buffer_predisable(indio_dev);
> -	if (ret < 0)
> -		return ret;
> +	int ret, ret2;
>  
>  	data->control &= ~TCS3414_CONTROL_ADC_EN;
> -	return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
> +	ret = i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
>  		data->control);
> +
> +	ret2 = iio_triggered_buffer_predisable(indio_dev);
> +	if (!ret)
> +		ret = ret2;
> +
> +	return ret;
>  }
>  
>  static const struct iio_buffer_setup_ops tcs3414_buffer_setup_ops = {
> -	.preenable = tcs3414_buffer_preenable,
> -	.postenable = &iio_triggered_buffer_postenable,
> +	.postenable = tcs3414_buffer_postenable,
>  	.predisable = tcs3414_buffer_predisable,
>  };
>