diff options
| author | Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> | 2014-04-29 00:51:00 +0100 |
|---|---|---|
| committer | Jonathan Cameron <jic23@kernel.org> | 2014-04-29 22:05:32 +0100 |
| commit | 9fbfb4b37ed23f71aa9484484266381c6c6964cb (patch) | |
| tree | 441b1f942d51a1729d10a3237c7a28853f482ff9 /drivers/iio/industrialio-event.c | |
| parent | 3046365bb470f0ec2f7cf5cb07a8ee7e4b490103 (diff) | |
| download | linux-9fbfb4b37ed23f71aa9484484266381c6c6964cb.tar.gz linux-9fbfb4b37ed23f71aa9484484266381c6c6964cb.tar.bz2 linux-9fbfb4b37ed23f71aa9484484266381c6c6964cb.zip | |
IIO: core: Introduce read_raw_multi
This callback is introduced to overcome some limitations of existing
read_raw callback. The functionality of both existing read_raw and
read_raw_multi is similar, both are used to request values from the
device. The current read_raw callback allows only two return values.
The new read_raw_multi allows returning multiple values. Instead of
passing just address of val and val2, it passes length and pointer
to values. Depending on the type and length of passed buffer, iio
client drivers can return multiple values.
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Diffstat (limited to 'drivers/iio/industrialio-event.c')
| -rw-r--r-- | drivers/iio/industrialio-event.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/iio/industrialio-event.c b/drivers/iio/industrialio-event.c index dddfb0f90d34..258a973a1fb8 100644 --- a/drivers/iio/industrialio-event.c +++ b/drivers/iio/industrialio-event.c @@ -270,7 +270,7 @@ static ssize_t iio_ev_value_show(struct device *dev, { struct iio_dev *indio_dev = dev_to_iio_dev(dev); struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); - int val, val2; + int val, val2, val_arr[2]; int ret; ret = indio_dev->info->read_event_value(indio_dev, @@ -279,7 +279,9 @@ static ssize_t iio_ev_value_show(struct device *dev, &val, &val2); if (ret < 0) return ret; - return iio_format_value(buf, ret, val, val2); + val_arr[0] = val; + val_arr[1] = val2; + return iio_format_value(buf, ret, 2, val_arr); } static ssize_t iio_ev_value_store(struct device *dev, |