linux-kernel - Re: [PATCH] iio: si7020: Fix endianness for I2C reads

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Message-ID: <5502BFC0.6050706@metafoo.de>
Date:	Fri, 13 Mar 2015 11:45:20 +0100
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Andrey Smirnov <andrew.smirnov@...il.com>,
	linux-iio@...r.kernel.org
CC:	linux-kernel@...r.kernel.org, quad@...bo1ics.com
Subject: Re: [PATCH] iio: si7020: Fix endianness for I2C reads

On 03/13/2015 03:53 AM, Andrey Smirnov wrote:
> Si7020 outputs most significant byte of the measurement result first
> and least significant byte last. As a result the data returned by
> i2c_smbus_read_word_data appears as big endian. Fix this by making a
> call to an approbriate byte conversion routine.

i2c_smbus_read_word_data() returns data in native endianess. But it 
interprets the word on the bus as little-endian (As specified by the SMBus 
spec). If your chip returns data in big-endian use 
i2c_smbus_read_word_data_swapped().

- Lars
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