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iio: industrialio-core: iio_write_channel_info accept IIO_VAL_INT_PLUS_NANO 

Allow iio_write_channel_info() to accept IIO_VAL_INT_PLUS_NANO

Changes since V1:
use callback to query expected format/precision

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Acked-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Michael Hennerich 2011-06-27 13:07:10 +01:00 committed by Greg Kroah-Hartman
parent 43a4360ea8
commit 5c04af0483
2 changed files with 28 additions and 6 deletions
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7
drivers/staging/iio/iio.h
View File

@ -220,6 +220,9 @@ struct iio_trigger; /* forward declaration */
* contain the elements making up the returned value.
* @write_raw: function to write a value to the device.
* Parameters are the same as for read_raw.
* @write_raw_get_fmt: callback function to query the expected
* format/precision. If not set by the driver, write_raw
* returns IIO_VAL_INT_PLUS_MICRO.
* @read_event_config: find out if the event is enabled.
* @write_event_config: set if the event is enabled.
* @read_event_value: read a value associated with the event. Meaning
@ -247,6 +250,10 @@ struct iio_info {
int val2,
long mask);
int (*write_raw_get_fmt)(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
long mask);
int (*read_event_config)(struct iio_dev *indio_dev,
int event_code);

27
drivers/staging/iio/industrialio-core.c
View File

@ -412,25 +412,40 @@ static ssize_t iio_write_channel_info(struct device *dev,
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
int ret, integer = 0, micro = 0, micro_mult = 100000;
int ret, integer = 0, fract = 0, fract_mult = 100000;
bool integer_part = true, negative = false;
/* Assumes decimal - precision based on number of digits */
if (!indio_dev->info->write_raw)
return -EINVAL;
if (indio_dev->info->write_raw_get_fmt)
switch (indio_dev->info->write_raw_get_fmt(indio_dev,
this_attr->c, this_attr->address)) {
case IIO_VAL_INT_PLUS_MICRO:
fract_mult = 100000;
break;
case IIO_VAL_INT_PLUS_NANO:
fract_mult = 100000000;
break;
default:
return -EINVAL;
}
if (buf[0] == '-') {
negative = true;
buf++;
}
while (*buf) {
if ('0' <= *buf && *buf <= '9') {
if (integer_part)
integer = integer*10 + *buf - '0';
else {
micro += micro_mult*(*buf - '0');
if (micro_mult == 1)
fract += fract_mult*(*buf - '0');
if (fract_mult == 1)
break;
micro_mult /= 10;
fract_mult /= 10;
}
} else if (*buf == '\n') {
if (*(buf + 1) == '\0')
@ -448,11 +463,11 @@ static ssize_t iio_write_channel_info(struct device *dev,
if (integer)
integer = -integer;
else
micro = -micro;
fract = -fract;
}
ret = indio_dev->info->write_raw(indio_dev, this_attr->c,
integer, micro, this_attr->address);
integer, fract, this_attr->address);
if (ret)
return ret;