On 3/21/21 6:07 AM, Lars-Peter Clausen wrote:
On 3/20/21 7:45 AM, Puranjay Mohan wrote:
TMP117 is a Digital temperature sensor with integrated NV memory.
Add support for tmp117 driver in iio subsystem.
Datasheet:-https://www.ti.com/lit/gpn/tmp117
Signed-off-by: Puranjay Mohan <puranjay12@xxxxxxxxx>
This looks good to me. Just two small bits I overlooked during the
first review, sorry for that.
+};
+
[...]
+static int tmp117_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *channel, int *val,
+ int *val2, long mask)
+{
+ struct tmp117_data *data = iio_priv(indio_dev);
+ u16 tmp, off;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ tmp = tmp117_read_reg(data, TMP117_REG_TEMP);
+ *val = tmp;
No need for tmp here. Just directly assign to val.
Actually thinking about this, does the current implementation work
correctly for negative temperatures?
I think there are two options to fix it. Either cast to s16 or use the
sign_extend32() function.
Have a look at how the tmp006 driver handles this. It is a good example,
including the error checking. In general you should check if your I2C
read failed and return an error in that case rather than a bogus value
for the measurement. Same for when reading the calibration offset.
Another thing. IIO reports temperature values in milli degrees Celsius.
I believe in the current implementation the scale is so that it will
report in degrees Celsius instead.
