linux-kernel - Re: [PATCH v2 2/8] iio: adc: ad7124: Add update_scan

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Message-ID: <20220319154543.0ae8993e@jic23-huawei>
Date:   Sat, 19 Mar 2022 15:45:43 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     <alexandru.tachici@...log.com>
Cc:     <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/8] iio: adc: ad7124: Add update_scan_mode

On Fri, 18 Mar 2022 18:27:16 +0200
<alexandru.tachici@...log.com> wrote:

> From: Alexandru Tachici <alexandru.tachici@...log.com>
> 
> The callback .set_channel cannot be used to enable
> and disable multiple channels at once as they are
> presented in the active_scan_mask.
Trivial: Aim to wrap commit messages around 70ish chars
and whatever you pick be consistent.

Patch looks fine to me otherwise so if nothing else comes up, I
may rewrap these patch descriptions whilst applying.

Jonathan

> 
> By adding an update_scan_mode callback, every time the
> continuous mode is activated, channels will be enabled/disabled
> accordingly.
> 
> Signed-off-by: Alexandru Tachici <alexandru.tachici@...log.com>
> ---
>  drivers/iio/adc/ad7124.c | 21 +++++++++++++++++++++
>  1 file changed, 21 insertions(+)
> 
> diff --git a/drivers/iio/adc/ad7124.c b/drivers/iio/adc/ad7124.c
> index 7249db2c4422..428ec3e257d7 100644
> --- a/drivers/iio/adc/ad7124.c
> +++ b/drivers/iio/adc/ad7124.c
> @@ -669,11 +669,32 @@ static const struct attribute_group ad7124_attrs_group = {
>  	.attrs = ad7124_attributes,
>  };
>  
> +static int ad7124_update_scan_mode(struct iio_dev *indio_dev,
> +				   const unsigned long *scan_mask)
> +{
> +	struct ad7124_state *st = iio_priv(indio_dev);
> +	bool bit_set;
> +	int ret;
> +	int i;
> +
> +	for (i = 0; i < st->num_channels; i++) {
> +		bit_set = test_bit(i, scan_mask);
> +		ret = ad7124_spi_write_mask(st, AD7124_CHANNEL(i),
> +					    AD7124_CHANNEL_EN_MSK,
> +					    AD7124_CHANNEL_EN(bit_set),
> +					    2);
> +		if (ret < 0)
> +			return ret;
> +	}
> +	return 0;
> +}
> +
>  static const struct iio_info ad7124_info = {
>  	.read_raw = ad7124_read_raw,
>  	.write_raw = ad7124_write_raw,
>  	.debugfs_reg_access = &ad7124_reg_access,
>  	.validate_trigger = ad_sd_validate_trigger,
> +	.update_scan_mode = ad7124_update_scan_mode,
>  	.attrs = &ad7124_attrs_group,
>  };
>