linux-kernel - Re: [PATCH v3 2/2] iio: temperature: add driver support for ti tmp117

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Message-ID: <3d840334-2c26-5748-8370-54cef6262e02@metafoo.de>
Date:   Wed, 7 Apr 2021 06:56:42 +0200
From:   Lars-Peter Clausen <lars@...afoo.de>
To:     Puranjay Mohan <puranjay12@...il.com>,
        alexandru.ardelean@...log.com, jic23@...nel.org,
        devicetree@...r.kernel.org, knaack.h@....de,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
        andy.shevchenko@...il.com
Subject: Re: [PATCH v3 2/2] iio: temperature: add driver support for ti tmp117

On 4/6/21 8:28 PM, Puranjay Mohan wrote:
> +
> +static int tmp117_write_raw(struct iio_dev *indio_dev,
> +		struct iio_chan_spec const *channel, int val,
> +		int val2, long mask)
> +{
> +	struct tmp117_data *data = iio_priv(indio_dev);
> +	s16 off;
> +
> +	switch (mask) {
> +	case IIO_CHAN_INFO_CALIBBIAS:
> +		off = clamp(val, -32768, 32767);
> +		if (off == data->calibbias)

data->calibbias is only set in probe() and always 0. I'm not sure we 
need to cache the value. Reading it back from the device seems fine.

> +			return 0;
> +		return i2c_smbus_write_word_swapped(data->client,
> +						TMP117_REG_TEMP_OFFSET, off);
> +
> +	default:
> +		return -EINVAL;
> +	}
> +}
> +