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iio:inkern: Add function to read the processed value

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Add a function to read a processed value from a channel. The function will first
attempt to read the IIO_CHAN_INFO_PROCESSED attribute. If that fails it will
read the IIO_CHAN_INFO_RAW attribute and convert the result from a raw value to
a processed value.

The patch also introduces a function to convert raw value to a processed value
and exports it, in case a user needs or wants to do the conversion by itself.

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 2012-09-17 13:17:00 +01:00 • committed by Jonathan Cameron
parent 45f010baa0
commit 48e44ce0f8
3 changed files with 164 additions and 9 deletions
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17
include/linux/iio/iio.h
View file

@ -40,6 +40,8 @@ enum iio_chan_info_enum {
#define IIO_CHAN_INFO_SHARED_BIT(type) BIT(type*2)
#define IIO_CHAN_INFO_SEPARATE_BIT(type) BIT(type*2 + 1)
#define IIO_CHAN_INFO_BITS(type) (IIO_CHAN_INFO_SHARED_BIT(type) | \
IIO_CHAN_INFO_SEPARATE_BIT(type))
#define IIO_CHAN_INFO_RAW_SEPARATE_BIT \
IIO_CHAN_INFO_SEPARATE_BIT(IIO_CHAN_INFO_RAW)
@ -261,6 +263,21 @@ struct iio_chan_spec {
unsigned differential:1;
};
/**
* iio_channel_has_info() - Checks whether a channel supports a info attribute
* @chan: The channel to be queried
* @type: Type of the info attribute to be checked
*
* Returns true if the channels supports reporting values for the given info
* attribute type, false otherwise.
*/
static inline bool iio_channel_has_info(const struct iio_chan_spec *chan,
enum iio_chan_info_enum type)
{
return chan->info_mask & IIO_CHAN_INFO_BITS(type);
}
#define IIO_ST(si, rb, sb, sh) \
{ .sign = si, .realbits = rb, .storagebits = sb, .shift = sh }