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staging:iio:ad7298: Fix temperature scale and offset

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The temperature scale and offset depend on the reference voltage, the current
formula used in the driver assumes a 2.5V reference. This patch modifies the
code to report the unprocessed value for the temperature channel "raw" property
and to provide proper "scale" and "offset" properties which depend on the
selected reference voltage.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Lars-Peter Clausen 2012-11-15 13:15:00 +00:00 committed by Jonathan Cameron
parent 2e33460098
commit 01a10e04f8
1 changed files with 26 additions and 31 deletions
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57
drivers/staging/iio/adc/ad7298_core.c
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@ -45,7 +45,8 @@ static const struct iio_chan_spec ad7298_channels[] = {
.indexed = 1,
.channel = 0,
.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
IIO_CHAN_INFO_SCALE_SEPARATE_BIT,
IIO_CHAN_INFO_SCALE_SEPARATE_BIT |
IIO_CHAN_INFO_OFFSET_SEPARATE_BIT,
.address = AD7298_CH_TEMP,
.scan_index = -1,
.scan_type = {
@ -80,7 +81,7 @@ static int ad7298_scan_direct(struct ad7298_state *st, unsigned ch)
static int ad7298_scan_temp(struct ad7298_state *st, int *val)
{
int tmp, ret;
int ret;
__be16 buf;
buf = cpu_to_be16(AD7298_WRITE | AD7298_TSENSE |
@ -102,26 +103,26 @@ static int ad7298_scan_temp(struct ad7298_state *st, int *val)
if (ret)
return ret;
tmp = be16_to_cpu(buf) & RES_MASK(AD7298_BITS);
/*
* One LSB of the ADC corresponds to 0.25 deg C.
* The temperature reading is in 12-bit twos complement format
*/
if (tmp & (1 << (AD7298_BITS - 1))) {
tmp = (4096 - tmp) * 250;
tmp -= (2 * tmp);
} else {
tmp *= 250; /* temperature in milli degrees Celsius */
}
*val = tmp;
*val = sign_extend32(be16_to_cpu(buf), 11);
return 0;
}
static int ad7298_get_ref_voltage(struct ad7298_state *st)
{
int vref;
if (st->ext_ref) {
vref = regulator_get_voltage(st->reg);
if (vref < 0)
return vref;
return vref / 1000;
} else {
return AD7298_INTREF_mV;
}
}
static int ad7298_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val,
@ -130,7 +131,6 @@ static int ad7298_read_raw(struct iio_dev *indio_dev,
{
int ret;
struct ad7298_state *st = iio_priv(indio_dev);
int scale_mv;
switch (m) {
case IIO_CHAN_INFO_RAW:
@ -155,24 +155,19 @@ static int ad7298_read_raw(struct iio_dev *indio_dev,
case IIO_CHAN_INFO_SCALE:
switch (chan->type) {
case IIO_VOLTAGE:
if (st->ext_ref) {
scale_mv = regulator_get_voltage(st->reg);
if (scale_mv < 0)
return scale_mv;
scale_mv /= 1000;
} else {
scale_mv = AD7298_INTREF_mV;
}
*val = scale_mv;
*val = ad7298_get_ref_voltage(st);
*val2 = chan->scan_type.realbits;
return IIO_VAL_FRACTIONAL_LOG2;
case IIO_TEMP:
*val = 1;
*val2 = 0;
return IIO_VAL_INT_PLUS_MICRO;
*val = ad7298_get_ref_voltage(st);
*val2 = 10;
return IIO_VAL_FRACTIONAL;
default:
return -EINVAL;
}
case IIO_CHAN_INFO_OFFSET:
*val = 1093 - 2732500 / ad7298_get_ref_voltage(st);
return IIO_VAL_INT;
}
return -EINVAL;
}