linux-kernel - Re: [PATCH v2 3/5] iio: adc: ad7606: add offset and phase calibration support

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <wvflf3rmqaonm6gt45gqtxndprkqbhgvce5z7c4z7c7jgdg4tm@kofkvcbvnaav>
Date: Tue, 6 May 2025 16:46:35 +0200
From: Angelo Dureghello <adureghello@...libre.com>
To: Andy Shevchenko <andy@...nel.org>
Cc: Jonathan Cameron <jic23@...nel.org>, 
	David Lechner <dlechner@...libre.com>, Nuno Sá <nuno.sa@...log.com>, 
	Lars-Peter Clausen <lars@...afoo.de>, Michael Hennerich <Michael.Hennerich@...log.com>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
	Conor Dooley <conor+dt@...nel.org>, linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org, 
	devicetree@...r.kernel.org
Subject: Re: [PATCH v2 3/5] iio: adc: ad7606: add offset and phase
 calibration support

On 02.05.2025 16:39, Andy Shevchenko wrote:
> On Fri, May 02, 2025 at 03:27:00PM +0200, Angelo Dureghello wrote:
> > From: Angelo Dureghello <adureghello@...libre.com>
> > 
> > Add support for offset and phase calibration, only for
> > devices that support software mode, that are:
> > 
> > ad7606b
> > ad7606c-16
> > ad7606c-18
> 
> ...
> 
> > +static int ad7606_get_calib_offset(struct ad7606_state *st, int ch, int *val)
> > +{
> > +	int ret;
> > +
> > +	ret = st->bops->reg_read(st, AD7606_CALIB_OFFSET(ch));
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	*val = st->chip_info->calib_offset_avail[0] +
> > +		ret * st->chip_info->calib_offset_avail[1];
> 
> Something wrong with the indentation.

Can eventually adjust to:

	*val = st->chip_info->calib_offset_avail[0] + ret *
		st->chip_info->calib_offset_avail[1];

this is genrelly ok.

> 
> > +	return 0;
> > +}
> 
> ...
> 
> > +static int ad7606_set_calib_offset(struct ad7606_state *st, int ch, int val)
> > +{
> > +	int start_val, step_val, stop_val;
> 
> All need to be signed?
> 

would keep them all as int, to avoid different type comparison later. 


> > +	start_val = st->chip_info->calib_offset_avail[0];
> > +	step_val = st->chip_info->calib_offset_avail[1];
> > +	stop_val = st->chip_info->calib_offset_avail[2];
> > +
> > +	if (val < start_val || val > stop_val)
> > +		return -EINVAL;
> > +
> > +	val -= start_val;
> > +	val /= step_val;
> > +
> > +	return st->bops->reg_write(st, AD7606_CALIB_OFFSET(ch), val);
> > +}
> 
> ...
> 
> > +static int ad7606_set_calib_phase(struct ad7606_state *st, int ch, int val,
> > +				  int val2)
> > +{
> > +	int wreg, start_ns, step_ns, stop_ns;
> 
> Ditto.
>
here too, val and val2 comes in as int, and subsequent operations
are int, so would stay as int.
 
> > +	if (val != 0)
> > +		return -EINVAL;
> > +
> > +	start_ns = st->chip_info->calib_phase_avail[0][1];
> > +	step_ns = st->chip_info->calib_phase_avail[1][1];
> > +	stop_ns = st->chip_info->calib_phase_avail[2][1];
> > +
> > +	/*
> > +	 * ad7606b: phase dielay from 0 to 318.75 μs in steps of 1.25 μs.
> > +	 * ad7606c-16/18: phase delay from 0 µs to 255 µs in steps of 1 µs.
> > +	 */
> > +	if (val2 < start_ns || val2 > stop_ns)
> > +			return -EINVAL;
> 
> Wrong indentation. Please fix in all places where it happens.
> 
rechecked better now, tabs in this place was wrong. Fixed, thanks.

> > +	wreg = val2 / step_ns;
> > +
> > +	return st->bops->reg_write(st, AD7606_CALIB_PHASE(ch), wreg);
> > +}
> 
> -- 
> With Best Regards,
> Andy Shevchenko
> 
> 
regards,
angelo