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staging: iio: ad7606: replace range/range_available with corresponding scale

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Eliminate the non-standard attributes in_voltage_range and
in_voltage_range_available. Implement in_voltage_scale_available in place
of these attributes and update the SCALE accordingly. The array
scale_avail is introduced to hold the available scale values.

Signed-off-by: Eva Rachel Retuya <eraretuya@gmail.com>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Eva Rachel Retuya 2017-01-07 19:10:23 +08:00 committed by Jonathan Cameron
parent 04e917305d
commit 17be2a2905
1 changed files with 41 additions and 42 deletions
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83
drivers/staging/iio/adc/ad7606.c
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@ -26,6 +26,11 @@
#include "ad7606.h"
/* Scales are computed as 2.5/2**16 and 5/2**16 respectively */
static const unsigned int scale_avail[2][2] = {
{0, 38147}, {0, 76294}
};
static int ad7606_reset(struct ad7606_state *st)
{
if (st->gpio_reset) {
@ -151,9 +156,9 @@ static int ad7606_read_raw(struct iio_dev *indio_dev,
*val = (short)ret;
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
*val = st->range * 2;
*val2 = st->chip_info->channels[0].scan_type.realbits;
return IIO_VAL_FRACTIONAL_LOG2;
*val = scale_avail[st->range][0];
*val2 = scale_avail[st->range][1];
return IIO_VAL_INT_PLUS_MICRO;
case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
*val = st->oversampling;
return IIO_VAL_INT;
@ -161,42 +166,22 @@ static int ad7606_read_raw(struct iio_dev *indio_dev,
return -EINVAL;
}
static ssize_t ad7606_show_range(struct device *dev,
struct device_attribute *attr, char *buf)
static ssize_t in_voltage_scale_available_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct ad7606_state *st = iio_priv(indio_dev);
int i, len = 0;
return sprintf(buf, "%u\n", st->range);
for (i = 0; i < ARRAY_SIZE(scale_avail); i++)
len += scnprintf(buf + len, PAGE_SIZE - len, "%d.%06u ",
scale_avail[i][0], scale_avail[i][1]);
buf[len - 1] = '\n';
return len;
}
static ssize_t ad7606_store_range(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct ad7606_state *st = iio_priv(indio_dev);
unsigned long lval;
int ret;
ret = kstrtoul(buf, 10, &lval);
if (ret)
return ret;
if (!(lval == 5000 || lval == 10000))
return -EINVAL;
mutex_lock(&indio_dev->mlock);
gpiod_set_value(st->gpio_range, lval == 10000);
st->range = lval;
mutex_unlock(&indio_dev->mlock);
return count;
}
static IIO_DEVICE_ATTR(in_voltage_range, S_IRUGO | S_IWUSR,
ad7606_show_range, ad7606_store_range, 0);
static IIO_CONST_ATTR(in_voltage_range_available, "5000 10000");
static IIO_DEVICE_ATTR_RO(in_voltage_scale_available, 0);
static int ad7606_oversampling_get_index(unsigned int val)
{
@ -218,9 +203,23 @@ static int ad7606_write_raw(struct iio_dev *indio_dev,
{
struct ad7606_state *st = iio_priv(indio_dev);
int values[3];
int ret;
int ret, i;
switch (mask) {
case IIO_CHAN_INFO_SCALE:
ret = -EINVAL;
mutex_lock(&indio_dev->mlock);
for (i = 0; i < ARRAY_SIZE(scale_avail); i++)
if (val2 == scale_avail[i][1]) {
gpiod_set_value(st->gpio_range, i);
st->range = i;
ret = 0;
break;
}
mutex_unlock(&indio_dev->mlock);
return ret;
case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
if (val2)
return -EINVAL;
@ -247,8 +246,7 @@ static int ad7606_write_raw(struct iio_dev *indio_dev,
static IIO_CONST_ATTR(oversampling_ratio_available, "1 2 4 8 16 32 64");
static struct attribute *ad7606_attributes_os_and_range[] = {
&iio_dev_attr_in_voltage_range.dev_attr.attr,
&iio_const_attr_in_voltage_range_available.dev_attr.attr,
&iio_dev_attr_in_voltage_scale_available.dev_attr.attr,
&iio_const_attr_oversampling_ratio_available.dev_attr.attr,
NULL,
};
@ -267,8 +265,7 @@ static const struct attribute_group ad7606_attribute_group_os = {
};
static struct attribute *ad7606_attributes_range[] = {
&iio_dev_attr_in_voltage_range.dev_attr.attr,
&iio_const_attr_in_voltage_range_available.dev_attr.attr,
&iio_dev_attr_in_voltage_scale_available.dev_attr.attr,
NULL,
};
@ -397,6 +394,7 @@ static const struct iio_info ad7606_info_os = {
static const struct iio_info ad7606_info_range = {
.driver_module = THIS_MODULE,
.read_raw = &ad7606_read_raw,
.write_raw = &ad7606_write_raw,
.attrs = &ad7606_attribute_group_range,
};
@ -417,7 +415,8 @@ int ad7606_probe(struct device *dev, int irq, void __iomem *base_address,
st->dev = dev;
st->bops = bops;
st->base_address = base_address;
st->range = 5000;
/* tied to logic low, analog input range is +/- 5V */
st->range = 0;
st->oversampling = 1;
INIT_WORK(&st->poll_work, &ad7606_poll_bh_to_ring);
@ -525,7 +524,7 @@ static int ad7606_resume(struct device *dev)
struct ad7606_state *st = iio_priv(indio_dev);
if (st->gpio_standby) {
gpiod_set_value(st->gpio_range, st->range == 10000);
gpiod_set_value(st->gpio_range, st->range);
gpiod_set_value(st->gpio_standby, 1);
ad7606_reset(st);
}