Re: [PATCH] iio: adc: max9611: Fix attribute measure unit

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On 09/05/17 12:53, Geert Uytterhoeven wrote:
Hi Jacopo,

On Tue, May 9, 2017 at 9:57 AM, Jacopo Mondi <jacopo+renesas@xxxxxxxxxx> wrote:
The power and current "shunt-resistor" attribute's 'show' function
displays the resistor value in milli-Ohms, while the ABI description
specifies it should be displayed in Ohms. Fix it.

Reported-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
Signed-off-by: Jacopo Mondi <jacopo+renesas@xxxxxxxxxx>

# cat /sys/bus/iio/devices/iio:device*/in_*_shunt_resistor
0.005000
0.005000
0.005000
0.005000
#

$ grep shunt-resistor -- arch/arm64/boot/dts/renesas/salvator-x.dtsi
shunt-resistor-micro-ohms = <5000>;
shunt-resistor-micro-ohms = <5000>;
$

Tested-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
Applied to the fixes-togreg branch of iio.git.

Thanks,

Jonathan

---
  drivers/iio/adc/max9611.c | 6 +++---
  1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/iio/adc/max9611.c b/drivers/iio/adc/max9611.c
index ec82106..4580ebd 100644
--- a/drivers/iio/adc/max9611.c
+++ b/drivers/iio/adc/max9611.c
@@ -438,10 +438,10 @@ static ssize_t max9611_shunt_resistor_show(struct device *dev,
         struct max9611_dev *max9611 = iio_priv(dev_to_iio_dev(dev));
         unsigned int i, r;

-       i = max9611->shunt_resistor_uohm / 1000;
-       r = max9611->shunt_resistor_uohm % 1000;
+       i = max9611->shunt_resistor_uohm / 1000000;
+       r = max9611->shunt_resistor_uohm % 1000000;

-       return sprintf(buf, "%u.%03u\n", i, r);
+       return sprintf(buf, "%u.%06u\n", i, r);
  }

Gr{oetje,eeting}s,

                         Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                 -- Linus Torvalds
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