From: Beomho Seo <beomho.seo@samsung.com>
To: linux-iio@vger.kernel.org
Cc: Jonathan Cameron <jic23@kernel.org>,
ldewangan@nvidia.com, Peter Meerwald <pmeerw@pmeerw.net>,
Myungjoo Ham <myungjoo.ham@samsung.com>,
Jaehoon Chung <jh80.chung@samsung.com>
Subject: [PATCH RESEND 0/2] iio: ak8975: Fix calculation formula and add device name
Date: Tue, 04 Feb 2014 18:15:56 +0900 [thread overview]
Message-ID: <52F0AFCC.7030306@samsung.com> (raw)
Three months ago Peter Meerwald revised description of device driver[1].
Correctly, device's sensitivity is 0.3 uT/LSB typ and One micro tesla equal 0.01 gauss[2].
So I have fixed calculation formula,And then add RAW_TO_GAUSS macro.
Scale are returned as VAL_INT_PLUS_MICRO.
Additionally, I have add device name.
Tested on exynos4412 board, with following result:
-sh-4.1# cat name
ak8975
-sh-4.1# cat in_magn_x_raw
80
-sh-4.1# cat in_magn_x_scale
0.003609
Calculate the result 80 x 0.003609 = 0.28872 Gauss.
0.28872 G equal 288.72 mG
I think this magnitude value is proper level[3].
[1] http://marc.info/?l=linux-iio&m=138220306822747&w=2
[2] http://en.wikipedia.org/wiki/Gauss_(unit)
[3] http://en.wikipedia.org/wiki/Orders_of_magnitude_(magnetic_field)
Beomho Seo (2):
iio: ak8975: Fix calculation formula for microtesla to gauss unit
iio: ak8975: Add device name
drivers/iio/magnetometer/ak8975.c | 17 ++++++++++-------
1 file changed, 10 insertions(+), 7 deletions(-)
--
Best Regards,
reply other threads:[~2014-02-04 9:15 UTC|newest]
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