linux-kernel - Re: [PATCH 1/9] iio: adc: ad7606: Fix hardcoded offset in the ADC channels

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Message-ID: <20241126181522.12be94f6@jic23-huawei>
Date: Tue, 26 Nov 2024 18:15:22 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: Guillaume Stols <gstols@...libre.com>
Cc: Lars-Peter Clausen <lars@...afoo.de>, Michael Hennerich
 <Michael.Hennerich@...log.com>, Nuno Sa <nuno.sa@...log.com>, Rob Herring
 <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Jonathan Cameron <Jonathan.Cameron@...wei.com>,
 linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
 devicetree@...r.kernel.org, dlechner@...libre.com, jstephan@...libre.com,
 aardelean@...libre.com, adureghello@...libre.com
Subject: Re: [PATCH 1/9] iio: adc: ad7606: Fix hardcoded offset in the ADC
 channels

On Thu, 21 Nov 2024 10:18:23 +0000
Guillaume Stols <gstols@...libre.com> wrote:

> When introducing num_adc_channels, I overlooked some new functions
> created in a meanwhile that had also the hardcoded offset. This commit
> adds the new logic to these functions.
> 
> Fixes: 7a671afeb592 ("iio: adc: ad7606: Introduce num_adc_channels")
> Signed-off-by: Guillaume Stols <gstols@...libre.com>
Hi Guillaume,

Trivial thing inline.

I can't pick this up quite yet as need to wait to rebase my fixes on rc1 sometime
next week.

Jonathan

> ---
>  drivers/iio/adc/ad7606.c | 48 ++++++++++++++++++++++++++++--------------------
>  drivers/iio/adc/ad7606.h |  2 +-
>  2 files changed, 29 insertions(+), 21 deletions(-)
> 
> diff --git a/drivers/iio/adc/ad7606.c b/drivers/iio/adc/ad7606.c
> index 8b2046baaa3e..893b93b86aa7 100644
> --- a/drivers/iio/adc/ad7606.c
> +++ b/drivers/iio/adc/ad7606.c
> @@ -175,17 +175,17 @@ static const struct iio_chan_spec ad7616_channels[] = {
> -static int ad7606_16bit_chan_scale_setup(struct ad7606_state *st,
> +static int ad7606_16bit_chan_scale_setup(struct iio_dev *indio_dev,
>  					 struct iio_chan_spec *chan, int ch)
>  {
> +	struct ad7606_state *st = iio_priv(indio_dev);
>  	struct ad7606_chan_scale *cs = &st->chan_scales[ch];
>  
>  	if (!st->sw_mode_en) {
> @@ -345,10 +346,12 @@ static int ad7606_16bit_chan_scale_setup(struct ad7606_state *st,
>  	return 0;
>  }
>  
> -static int ad7606_get_chan_config(struct ad7606_state *st, int ch,
> +static int ad7606_get_chan_config(struct iio_dev *indio_dev, int ch,
>  				  bool *bipolar, bool *differential)
>  {
> -	unsigned int num_channels = st->chip_info->num_channels - 1;
> +	struct ad7606_state *st = iio_priv(indio_dev);
> +	unsigned int num_channels = st->chip_info->num_adc_channels;
> +	unsigned int offset = indio_dev->num_channels - st->chip_info->num_adc_channels;
>  	struct device *dev = st->dev;
>  	int ret;
>  
> @@ -364,7 +367,7 @@ static int ad7606_get_chan_config(struct ad7606_state *st, int ch,
>  			continue;
>  
>  		/* channel number (here) is from 1 to num_channels */
> -		if (reg == 0 || reg > num_channels) {
> +		if (reg < offset  || reg > num_channels) {

Unwanted bonus space before ||

>  			dev_warn(dev,
>  				 "Invalid channel number (ignoring): %d\n", reg);
>  			continue;
> @@ -399,9 +402,10 @@ static int ad7606_get_chan_config(struct ad7606_state *st, int ch,
>  	return 0;
>  }