Re: [PATCH] iio: inkern: add iio_write_channel_raw

[Hartmut Knaack <knaack.h@gmx.de>]

Dmitry Eremin-Solenikov schrieb am 26.11.2014 um 23:42:
> Introduce API for easy in-kernel setting of DAC values.
> 
Looking good in general, but indentation of parameters could be
improved to align with opening parenthesis. See inline.
> Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
> ---
>  drivers/iio/inkern.c         | 29 +++++++++++++++++++++++++++++
>  include/linux/iio/consumer.h | 11 +++++++++++
>  2 files changed, 40 insertions(+)
> 
> diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c
> index f084610..5b03e69 100644
> --- a/drivers/iio/inkern.c
> +++ b/drivers/iio/inkern.c
> @@ -608,3 +608,32 @@ err_unlock:
>  	return ret;
>  }
>  EXPORT_SYMBOL_GPL(iio_get_channel_type);
> +
> +static int iio_channel_write(struct iio_channel *chan, int val, int val2,
> +	enum iio_chan_info_enum info)
Here.
> +{
> +	int ret;
> +
> +	ret = chan->indio_dev->info->write_raw(chan->indio_dev,
> +			chan->channel, val, val2, info);
Here.
> +
> +	return ret;
> +}
> +
> +int iio_write_channel_raw(struct iio_channel *chan, int val)
> +{
> +	int ret;
> +
> +	mutex_lock(&chan->indio_dev->info_exist_lock);
> +	if (chan->indio_dev->info == NULL) {
> +		ret = -ENODEV;
> +		goto err_unlock;
> +	}
> +
> +	ret = iio_channel_write(chan, val, 0, IIO_CHAN_INFO_RAW);
> +err_unlock:
> +	mutex_unlock(&chan->indio_dev->info_exist_lock);
> +
> +	return ret;
> +}
> +EXPORT_SYMBOL_GPL(iio_write_channel_raw);
> diff --git a/include/linux/iio/consumer.h b/include/linux/iio/consumer.h
> index 651f9a0..06f4688 100644
> --- a/include/linux/iio/consumer.h
> +++ b/include/linux/iio/consumer.h
> @@ -151,6 +151,17 @@ int iio_read_channel_average_raw(struct iio_channel *chan, int *val);
>  int iio_read_channel_processed(struct iio_channel *chan, int *val);
>  
>  /**
> + * iio_write_channel_raw() - write to a given channel
> + * @chan:		The channel being queried.
> + * @val:		Value being written.
> + *
> + * Note raw writes to iio channels are in dac counts and hence
> + * scale will need to be applied if standard units required.
> + */
> +int iio_write_channel_raw(struct iio_channel *chan,
> +			 int val);
And here, everything would easily fit in just one line.
> +
> +/**
>   * iio_get_channel_type() - get the type of a channel
>   * @channel:		The channel being queried.
>   * @type:		The type of the channel.
>