From: Peter Meerwald <pmeerw@pmeerw.net>
To: linux-iio@vger.kernel.org
Cc: jic23@kernel.org, ldewangan@nvidia.com,
Peter Meerwald <pmeerw@pmeerw.net>
Subject: [PATCH] iio: Correct description how to convert microtesla to gauss
Date: Sat, 19 Oct 2013 19:17:43 +0200 [thread overview]
Message-ID: <1382203063-31141-1-git-send-email-pmeerw@pmeerw.net> (raw)
this just fixes the comment; however, I'm not sure if the driver reports
measurements correctly; the raw values are 0.3 uT / LSB; IIO is supposed
to report magnetic fields in Gauss, so the scale should be around 1/300
(ignoring ASA) -- but value and scale are returned as VAL_INT
Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
---
drivers/iio/magnetometer/ak8975.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/iio/magnetometer/ak8975.c b/drivers/iio/magnetometer/ak8975.c
index 7105f22..ff284e5 100644
--- a/drivers/iio/magnetometer/ak8975.c
+++ b/drivers/iio/magnetometer/ak8975.c
@@ -263,7 +263,7 @@ static int ak8975_setup(struct i2c_client *client)
*
* HuT = H * 1229/4096, or roughly, 3/10.
*
- * Since 1uT = 100 gauss, our final scale factor becomes:
+ * Since 1uT = 0.01 gauss, our final scale factor becomes:
*
* Hadj = H * ((ASA + 128) / 256) * 3/10 * 100
* Hadj = H * ((ASA + 128) * 30 / 256
--
1.8.4.1
next reply other threads:[~2013-10-19 17:17 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-19 17:17 Peter Meerwald [this message]
2013-10-20 21:38 ` [PATCH] iio: Correct description how to convert microtesla to gauss Jonathan Cameron
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