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SubjectRe: [PATCH v3 3/7] iio: imu: adis16480: Treat temperature scale in a generic way
On Wed, 27 Feb 2019 18:14:24 +0200
Stefan Popa <stefan.popa@analog.com> wrote:

> All supported devices provide internal temperature measurement from -40 C
> to +85 C, with +25 C representing value 0x00.
>
> This patch treats the temperature scale in a generic way, similar to the
> accelerometer and gyroscope scales. So far, there are no temperature max
> scale differences between the supported devices. However, devices that
> will make use of this feature will be added in the future.
>
> Signed-off-by: Stefan Popa <stefan.popa@analog.com>
Applied. Thanks,

Jonathan

> ---
> drivers/iio/imu/adis16480.c | 18 +++++++++++++++---
> 1 file changed, 15 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/iio/imu/adis16480.c b/drivers/iio/imu/adis16480.c
> index 150d814..5a2864a 100644
> --- a/drivers/iio/imu/adis16480.c
> +++ b/drivers/iio/imu/adis16480.c
> @@ -124,6 +124,7 @@ struct adis16480_chip_info {
> unsigned int gyro_max_scale;
> unsigned int accel_max_val;
> unsigned int accel_max_scale;
> + unsigned int temp_scale;
> };
>
> enum adis16480_int_pin {
> @@ -530,6 +531,7 @@ static int adis16480_read_raw(struct iio_dev *indio_dev,
> const struct iio_chan_spec *chan, int *val, int *val2, long info)
> {
> struct adis16480 *st = iio_priv(indio_dev);
> + unsigned int temp;
>
> switch (info) {
> case IIO_CHAN_INFO_RAW:
> @@ -549,8 +551,13 @@ static int adis16480_read_raw(struct iio_dev *indio_dev,
> *val2 = 100; /* 0.0001 gauss */
> return IIO_VAL_INT_PLUS_MICRO;
> case IIO_TEMP:
> - *val = 5;
> - *val2 = 650000; /* 5.65 milli degree Celsius */
> + /*
> + * +85 degrees Celsius = temp_max_scale
> + * +25 degrees Celsius = 0
> + * LSB, 25 degrees Celsius = 60 / temp_max_scale
> + */
> + *val = st->chip_info->temp_scale / 1000;
> + *val2 = (st->chip_info->temp_scale % 1000) * 1000;
> return IIO_VAL_INT_PLUS_MICRO;
> case IIO_PRESSURE:
> *val = 0;
> @@ -561,7 +568,8 @@ static int adis16480_read_raw(struct iio_dev *indio_dev,
> }
> case IIO_CHAN_INFO_OFFSET:
> /* Only the temperature channel has a offset */
> - *val = 4425; /* 25 degree Celsius = 0x0000 */
> + temp = 25 * 1000000LL; /* 25 degree Celsius = 0x0000 */
> + *val = DIV_ROUND_CLOSEST_ULL(temp, st->chip_info->temp_scale);
> return IIO_VAL_INT;
> case IIO_CHAN_INFO_CALIBBIAS:
> return adis16480_get_calibbias(indio_dev, chan, val);
> @@ -717,6 +725,7 @@ static const struct adis16480_chip_info adis16480_chip_info[] = {
> .gyro_max_scale = 300,
> .accel_max_val = IIO_M_S_2_TO_G(21973),
> .accel_max_scale = 18,
> + .temp_scale = 5650, /* 5.65 milli degree Celsius */
> },
> [ADIS16480] = {
> .channels = adis16480_channels,
> @@ -725,6 +734,7 @@ static const struct adis16480_chip_info adis16480_chip_info[] = {
> .gyro_max_scale = 450,
> .accel_max_val = IIO_M_S_2_TO_G(12500),
> .accel_max_scale = 10,
> + .temp_scale = 5650, /* 5.65 milli degree Celsius */
> },
> [ADIS16485] = {
> .channels = adis16485_channels,
> @@ -733,6 +743,7 @@ static const struct adis16480_chip_info adis16480_chip_info[] = {
> .gyro_max_scale = 450,
> .accel_max_val = IIO_M_S_2_TO_G(20000),
> .accel_max_scale = 5,
> + .temp_scale = 5650, /* 5.65 milli degree Celsius */
> },
> [ADIS16488] = {
> .channels = adis16480_channels,
> @@ -741,6 +752,7 @@ static const struct adis16480_chip_info adis16480_chip_info[] = {
> .gyro_max_scale = 450,
> .accel_max_val = IIO_M_S_2_TO_G(22500),
> .accel_max_scale = 18,
> + .temp_scale = 5650, /* 5.65 milli degree Celsius */
> },
> };
>

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