linux-kernel - Re: [PATCH v2 1/4] iio: inkern: API for reading available iio channel attribute values

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Date:   Sun, 14 Apr 2019 11:34:54 +0100
From:   Jonathan Cameron <jic23@...23.retrosnub.co.uk>
To:     Artur Rojek <contact@...ur-rojek.eu>
Cc:     Sebastian Reichel <sre@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>, linux-pm@...r.kernel.org,
        linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Paul Cercueil <paul@...pouillou.net>
Subject: Re: [PATCH v2 1/4] iio: inkern: API for reading available iio
 channel attribute values

On Sun, 24 Mar 2019 15:27:25 +0000
Jonathan Cameron <jic23@...nel.org> wrote:

> On Sat, 23 Mar 2019 18:28:06 +0100
> Artur Rojek <contact@...ur-rojek.eu> wrote:
> 
> > Extend the inkern API with a function for reading available
> > attribute values of iio channels.
> > 
> > Signed-off-by: Artur Rojek <contact@...ur-rojek.eu>  
> If this goes through a route other than IIO (otherwise
> I'll just add a signed-off-by...)
> 
> Acked-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>

Applied to the ib-jz47xx-prereq branch of
git://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git

I'll merge that into the togreg branch as well shortly.

Thanks,

Jonathan
> 
> > ---
> > 
> > Changes:
> > 
> > v2: no change
> > 
> >  drivers/iio/inkern.c         | 20 ++++++++++++++++++++
> >  include/linux/iio/consumer.h | 14 ++++++++++++++
> >  2 files changed, 34 insertions(+)
> > 
> > diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c
> > index 06ca3f7fcc44..f19dbde3c945 100644
> > --- a/drivers/iio/inkern.c
> > +++ b/drivers/iio/inkern.c
> > @@ -733,6 +733,26 @@ static int iio_channel_read_avail(struct iio_channel *chan,
> >  						 vals, type, length, info);
> >  }
> >  
> > +int iio_read_avail_channel_attribute(struct iio_channel *chan,
> > +				     const int **vals, int *type, int *length,
> > +				     enum iio_chan_info_enum attribute)
> > +{
> > +	int ret;
> > +
> > +	mutex_lock(&chan->indio_dev->info_exist_lock);
> > +	if (!chan->indio_dev->info) {
> > +		ret = -ENODEV;
> > +		goto err_unlock;
> > +	}
> > +
> > +	ret = iio_channel_read_avail(chan, vals, type, length, attribute);
> > +err_unlock:
> > +	mutex_unlock(&chan->indio_dev->info_exist_lock);
> > +
> > +	return ret;
> > +}
> > +EXPORT_SYMBOL_GPL(iio_read_avail_channel_attribute);
> > +
> >  int iio_read_avail_channel_raw(struct iio_channel *chan,
> >  			       const int **vals, int *length)
> >  {
> > diff --git a/include/linux/iio/consumer.h b/include/linux/iio/consumer.h
> > index 9887f4f8e2a8..b2d34831ed7c 100644
> > --- a/include/linux/iio/consumer.h
> > +++ b/include/linux/iio/consumer.h
> > @@ -290,6 +290,20 @@ int iio_read_max_channel_raw(struct iio_channel *chan, int *val);
> >  int iio_read_avail_channel_raw(struct iio_channel *chan,
> >  			       const int **vals, int *length);
> >  
> > +/**
> > + * iio_read_avail_channel_attribute() - read available channel attribute values
> > + * @chan:		The channel being queried.
> > + * @vals:		Available values read back.
> > + * @type:		Type of values read back.
> > + * @length:		Number of entries in vals.
> > + * @attribute:		info attribute to be read back.
> > + *
> > + * Returns an error code, IIO_AVAIL_RANGE or IIO_AVAIL_LIST.
> > + */
> > +int iio_read_avail_channel_attribute(struct iio_channel *chan,
> > +				     const int **vals, int *type, int *length,
> > +				     enum iio_chan_info_enum attribute);
> > +
> >  /**
> >   * iio_get_channel_type() - get the type of a channel
> >   * @channel:		The channel being queried.  
>