linux-toradex.git/include/linux/iio, branch v3.7-rc2

iio:inkern: Add function to read the processed value

2012-09-17T20:48:51+00:00

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 
Signed-off-by: Jonathan Cameron

iio: consumer.h: Fix kernel doc incosistency

2012-09-17T20:41:26+00:00

For the iio_read_channel_raw and iio_read_channel_scale the kerneldoc comment
refers to an argument called "channel", while the argument is called "chan" in
the function signature. This leads to the following warnings from kerneldoc:

	Warning(include/linux/iio/consumer.h:71): No description found for parameter 'chan'
	Warning(include/linux/iio/consumer.h:71): Excess function parameter 'channel' description in 'iio_read_channel_raw'
	Warning(include/linux/iio/consumer.h:109): No description found for parameter 'chan'
	Warning(include/linux/iio/consumer.h:109): Excess function parameter 'channel' description in 'iio_read_channel_scale'

This patch fixes the warnings by naming them consistently.

Signed-off-by: Lars-Peter Clausen 
Signed-off-by: Jonathan Cameron

iio: Introduce a new fractional value type

2012-09-15T09:12:22+00:00

Currently IIO uses a decimal fixed point representations for real type numbers.
This patch introduces a new representation for rational type numbers. The number
will be expressed by specifying a numerator and denominator. For converting a
raw value to a processed value multiply it by the numerator and divide it by the
denominator.

The reasoning for introducing this new type is that for a lot of devices the
scale can be represented easily by a fractional number, but it is not possible
to represent it as fixed point number without rounding.  E.g. for a simple DAC
the scale is often the reference voltage divided by the number of possible
values (Usually 2**n_bits - 1). Each driver currently implements the conversion
of this fraction to a fixed point number on its own.

Also when it comes to the in-kernel interface this allows to directly use the
fractional factors to convert a raw value to a processed value. This should on
one hand require less instructions and on the other hand increase the
precision.

Signed-off-by: Lars-Peter Clausen 
Signed-off-by: Jonathan Cameron

iio: Drop timestamp parameter from buffer store_to callback

2012-09-08T09:14:34+00:00

Drop timestamp parameter from buffer store_to callback and subsequently from
iio_push_to_buffer. The timestamp parameter is unused and it seems likely that
it will stay unused in the future, so it should be safe to remove it.

Signed-off-by: Lars-Peter Clausen 
Signed-off-by: Jonathan Cameron

iio: core: Add hysteresis in channel spec

2012-09-06T18:04:45+00:00

Added hysteresis to the list of channel info enumeration, shared
/separate bit defines and to postfix channel info strings.

Signed-off-by: srinivas pandruvada 
Signed-off-by: Jonathan Cameron

iio: whitespace cleanup and removal of semicolon after functions

2012-09-03T19:26:43+00:00

Signed-off-by: Peter Meerwald 
Signed-off-by: Jonathan Cameron

iio: fix typos

2012-09-03T19:26:43+00:00

Signed-off-by: Peter Meerwald 
Signed-off-by: Jonathan Cameron

iio: document missing elements

2012-09-03T19:26:42+00:00

Signed-off-by: Peter Meerwald 
Signed-off-by: Jonathan Cameron

iio:trigger_consumer.h: Add missing includes and forward declarations

2012-08-27T17:57:59+00:00

Add includes and forward declarations for types used in this file. This avoids
compile errors if the other files have not been included before.

Signed-off-by: Lars-Peter Clausen 
Signed-off-by: Jonathan Cameron

iio: Add missing include guards to headers

2012-08-27T17:57:56+00:00

Add include guards to the IIO headers where they are missing. This avoids
compile errors due to redefined types if a file is included more than once.

Signed-off-by: Lars-Peter Clausen 
Signed-off-by: Jonathan Cameron