linux-kernel - Re: [PATCH v8 5/6] iio: core: Add support for writing 64 bit attrs

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Message-ID: <20250330162049.737de22a@jic23-huawei>
Date: Sun, 30 Mar 2025 16:20:49 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: Sam Winchenbach <sam.winchenbach@...mepointer.org>
Cc: linux-kernel@...r.kernel.org, lars@...afoo.de,
 Michael.Hennerich@...log.com, antoniu.miclaus@...log.com, robh@...nel.org,
 krzk+dt@...nel.org, conor+dt@...nel.org, linux-iio@...r.kernel.org,
 devicetree@...r.kernel.org, bpellegrino@...a.org, Sam Winchenbach
 <swinchenbach@...a.org>
Subject: Re: [PATCH v8 5/6] iio: core: Add support for writing 64 bit attrs

On Sun, 30 Mar 2025 16:17:21 +0100
Jonathan Cameron <jic23@...nel.org> wrote:

> On Fri, 28 Mar 2025 13:48:30 -0400
> Sam Winchenbach <sam.winchenbach@...mepointer.org> wrote:
> 
> > From: Sam Winchenbach <swinchenbach@...a.org>
> > 
> > Prior to this patch it was only possible to read 64 bit integers.
> > 
> > Signed-off-by: Sam Winchenbach <swinchenbach@...a.org>
> > ---
> >  drivers/iio/industrialio-core.c | 12 ++++++++++++
> >  1 file changed, 12 insertions(+)
> > 
> > diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
> > index a2117ad1337d5..b2436b8f3eeae 100644
> > --- a/drivers/iio/industrialio-core.c
> > +++ b/drivers/iio/industrialio-core.c
> > @@ -965,8 +965,10 @@ static ssize_t iio_write_channel_info(struct device *dev,
> >  	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
> >  	int ret, fract_mult = 100000;
> >  	int integer, fract = 0;
> > +	long long integer64;
> >  	bool is_char = false;
> >  	bool scale_db = false;
> > +	bool is_64bit = false;
> >  
> >  	/* Assumes decimal - precision based on number of digits */
> >  	if (!indio_dev->info->write_raw)
> > @@ -990,6 +992,9 @@ static ssize_t iio_write_channel_info(struct device *dev,
> >  		case IIO_VAL_CHAR:
> >  			is_char = true;
> >  			break;
> > +		case IIO_VAL_INT_64:
> > +			is_64bit = true;
> > +			break;
> >  		default:
> >  			return -EINVAL;
> >  		}
> > @@ -1000,6 +1005,13 @@ static ssize_t iio_write_channel_info(struct device *dev,
> >  		if (sscanf(buf, "%c", &ch) != 1)
> >  			return -EINVAL;
> >  		integer = ch;
> > +	} else if (is_64bit) {
> > +		ret = kstrtoll(buf, 0, &integer64);
> > +		if (ret)
> > +			return ret;
> > +
> > +		fract = (int)(integer64 >> 32);
> > +		integer = (int)(integer64 & 0xFFFFFFFF);  
> I forgot on previous reviews but for this case we have wordpart.h
> 
> 		fract = lower_32_bits(integer64);
> 		integer = upper_32_bits(integer64);
oops. Other way around obviously!

> 
> I'll tweak that whilst applying.
> 
> >  	} else {
> >  		ret = __iio_str_to_fixpoint(buf, fract_mult, &integer, &fract,
> >  					    scale_db);  
> 
>