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>
[...]Isn't the unit here 100 uC?
+#define TMP117_RESOLUTION_10UC 78125
+#define TMP117_DEVICE_ID 0x0117
+
+struct tmp117_data {
+ struct i2c_client *client;
+};
+
+static int tmp117_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *channel, int *val,
+ int *val2, long mask)
+{
[...]
+ case IIO_CHAN_INFO_CALIBBIAS:
+ ret = i2c_smbus_read_word_swapped(data->client,
+ TMP117_REG_TEMP_OFFSET);
+ if (ret < 0)
+ return ret;
+ *val = ((int16_t)ret * (int32_t)TMP117_RESOLUTION_10UC)
+ / 10000;
+ *val2 = ((int16_t)ret * (int32_t)TMP117_RESOLUTION_10UC)
+ % 10000;
+ return IIO_VAL_INT_PLUS_MICRO;This should have some input validation to avoid writing bogus values to the register when the value is out of range. You can either reject out of range values or clamp them into the valid range (using the clamp() macro).
[...]
+}
+
+static int tmp117_write_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);
+ s16 off;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_CALIBBIAS:
+ off = (s16)val;
+ return i2c_smbus_write_word_swapped(data->client,[...]
+ TMP117_REG_TEMP_OFFSET, off);
+
+ default:
+ return -EINVAL;
+ }
+}
+