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staging:iio:adc:ad7152: update scale handling 

Add scale_available attribute.
fix ad7152_scale_table, values are not sorted descending.
Use IIO_VAL_INT_PLUS_NANO, to increase granularity.
Update scale handling accordingly.

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Michael Hennerich 2011-09-02 17:25:28 +01:00 committed by Greg Kroah-Hartman
parent 2b8cb40c9c
commit 9b7244192f
1 changed files with 22 additions and 4 deletions
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26
drivers/staging/iio/adc/ad7152.c
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@ -191,12 +191,16 @@ static IIO_DEV_ATTR_FILTER_RATE_SETUP(S_IRUGO | S_IWUSR,
ad7152_show_filter_rate_setup,
ad7152_store_filter_rate_setup);
static IIO_CONST_ATTR(in_capacitance_scale_available,
"0.000061050 0.000030525 0.000015263 0.000007631");
static struct attribute *ad7152_attributes[] = {
&iio_dev_attr_filter_rate_setup.dev_attr.attr,
&iio_dev_attr_in_capacitance0_calibbias_calibration.dev_attr.attr,
&iio_dev_attr_in_capacitance1_calibbias_calibration.dev_attr.attr,
&iio_dev_attr_in_capacitance0_calibscale_calibration.dev_attr.attr,
&iio_dev_attr_in_capacitance1_calibscale_calibration.dev_attr.attr,
&iio_const_attr_in_capacitance_scale_available.dev_attr.attr,
NULL,
};
@ -211,9 +215,9 @@ static const u8 ad7152_addresses[][4] = {
AD7152_REG_CH2_GAIN_HIGH, AD7152_REG_CH2_SETUP },
};
/* Values are micro relative to pf base. */
/* Values are nano relative to pf base. */
static const int ad7152_scale_table[] = {
488, 244, 122, 61
30525, 7631, 15263, 61050
};
static int ad7152_write_raw(struct iio_dev *dev_info,
@ -254,7 +258,7 @@ static int ad7152_write_raw(struct iio_dev *dev_info,
if (val != 0)
return -EINVAL;
for (i = 0; i < ARRAY_SIZE(ad7152_scale_table); i++)
if (val2 <= ad7152_scale_table[i])
if (val2 == ad7152_scale_table[i])
break;
chip->setup[chan->channel] &= ~AD7152_SETUP_RANGE_4pF;
@ -346,15 +350,29 @@ static int ad7152_read_raw(struct iio_dev *dev_info,
*val = 0;
*val2 = ad7152_scale_table[ret >> 6];
return IIO_VAL_INT_PLUS_MICRO;
return IIO_VAL_INT_PLUS_NANO;
default:
return -EINVAL;
};
}
static int ad7152_write_raw_get_fmt(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
long mask)
{
switch (mask) {
case (1 << IIO_CHAN_INFO_SCALE_SEPARATE):
return IIO_VAL_INT_PLUS_NANO;
default:
return IIO_VAL_INT_PLUS_MICRO;
}
}
static const struct iio_info ad7152_info = {
.attrs = &ad7152_attribute_group,
.read_raw = &ad7152_read_raw,
.write_raw = &ad7152_write_raw,
.write_raw_get_fmt = &ad7152_write_raw_get_fmt,
.driver_module = THIS_MODULE,
};