diff options
| author | Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> | 2014-04-29 03:51:00 +0400 |
|---|---|---|
| committer | Jonathan Cameron <jic23@kernel.org> | 2014-04-30 01:05:32 +0400 |
| commit | 9fbfb4b37ed23f71aa9484484266381c6c6964cb (patch) | |
| tree | 441b1f942d51a1729d10a3237c7a28853f482ff9 /include/linux/iio | |
| parent | 3046365bb470f0ec2f7cf5cb07a8ee7e4b490103 (diff) | |
| download | linux-9fbfb4b37ed23f71aa9484484266381c6c6964cb.tar.xz | |
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 'include/linux/iio')
| -rw-r--r-- | include/linux/iio/iio.h | 17 | ||||
| -rw-r--r-- | include/linux/iio/types.h | 1 |
2 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h index 5f2d00e7e488..5629c92eeadf 100644 --- a/include/linux/iio/iio.h +++ b/include/linux/iio/iio.h @@ -288,6 +288,8 @@ static inline s64 iio_get_time_ns(void) #define INDIO_ALL_BUFFER_MODES \ (INDIO_BUFFER_TRIGGERED | INDIO_BUFFER_HARDWARE) +#define INDIO_MAX_RAW_ELEMENTS 4 + struct iio_trigger; /* forward declaration */ struct iio_dev; @@ -302,6 +304,14 @@ struct iio_dev; * the channel in question. Return value will specify the * type of value returned by the device. val and val2 will * contain the elements making up the returned value. + * @read_raw_multi: function to return values from the device. + * mask specifies which value. Note 0 means a reading of + * the channel in question. Return value will specify the + * type of value returned by the device. vals pointer + * contain the elements making up the returned value. + * max_len specifies maximum number of elements + * vals pointer can contain. val_len is used to return + * length of valid elements in vals. * @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 @@ -328,6 +338,13 @@ struct iio_info { int *val2, long mask); + int (*read_raw_multi)(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int max_len, + int *vals, + int *val_len, + long mask); + int (*write_raw)(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, diff --git a/include/linux/iio/types.h b/include/linux/iio/types.h index 084d882fe01b..a13c2241abce 100644 --- a/include/linux/iio/types.h +++ b/include/linux/iio/types.h @@ -79,6 +79,7 @@ enum iio_event_direction { #define IIO_VAL_INT_PLUS_MICRO 2 #define IIO_VAL_INT_PLUS_NANO 3 #define IIO_VAL_INT_PLUS_MICRO_DB 4 +#define IIO_VAL_INT_MULTIPLE 5 #define IIO_VAL_FRACTIONAL 10 #define IIO_VAL_FRACTIONAL_LOG2 11 |