iio:adc:berlin2-adc: use short operator format

Use augmented assignment to subtract the offset for negative temperature
values.
Specify the amount of private data to be allocated through
devm_iio_device_alloc() with sizeof(*priv), as it is shorter and common
practice in IIO.

Signed-off-by: Hartmut Knaack <knaack.h@gmx.de>
Acked-by: Antoine Tenart <antoine.tenart@free-electrons.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/drivers/iio/adc/berlin2-adc.c b/drivers/iio/adc/berlin2-adc.c
index 2084b0b..e04b773 100644 (file)
--- a/drivers/iio/adc/berlin2-adc.c
+++ b/drivers/iio/adc/berlin2-adc.c
@@ -221,7 +221,7 @@ static int berlin2_adc_read_raw(struct iio_dev *indio_dev,
                        return temp;
 
                if (temp > 2047)
-                       temp = -(4096 - temp);
+                       temp -= 4096;
 
                /* Convert to milli Celsius */
                *val = ((temp * 100000) / 264 - 270000);
@@ -286,8 +286,7 @@ static int berlin2_adc_probe(struct platform_device *pdev)
        int irq, tsen_irq;
        int ret;
 
-       indio_dev = devm_iio_device_alloc(&pdev->dev,
-                                         sizeof(struct berlin2_adc_priv));
+       indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*priv));
        if (!indio_dev)
                return -ENOMEM;