linux-stable.git/include/linux/iio/types.h, branch v3.7.4

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 channel type and modifiers for CCT and RGBC data

2012-07-10T17:49:26+00:00

Add iio channel type and modifiers for Correlated Color Temperature (CCT)
and RGBC (red/green/blue/clear) data.
Add CCT and RGBC descriptions to documentation.

Changes:
Revised/condensed RGBC descriptions.

Merge and trivial fix done by Jonathan Cameron.

Signed-off-by: Jon Brenner 
Signed-off-by: Jonathan Cameron

IIO: Add a modifier for x^2+y^2+z^2

2012-06-30T09:15:28+00:00

There will probably be a number of such modifiers eventually but
this one is used in the adis16240 accelerometer driver.

Signed-off-by: Jonathan Cameron

IIO: Add a modifier for sqrt(x^2+y^2)

2012-06-30T09:15:22+00:00

There will probably be a number of such modifiers eventually but
this one is used in the adis16204 accelerometer driver.

Signed-off-by: Jonathan Cameron

iio: drop comment about 'real' channels

2012-06-12T21:50:51+00:00

Signed-off-by: Peter Meerwald 
Acked-by: Jonathan Cameron 
Signed-off-by: Greg Kroah-Hartman

iio: core: introduce dB scle: IIO_VAL_INT_PLUS_MICRO_DB

2012-05-14T20:15:38+00:00

Signed-off-by: Michael Hennerich 
Acked-by: Jonathan Cameron 
Signed-off-by: Greg Kroah-Hartman

iio: core: Introduce IIO_ALTVOLTAGE and appropriate channel info elements

2012-04-30T01:26:17+00:00

Signed-off-by: Michael Hennerich 
Acked-by: Jonathan Cameron 
Signed-off-by: Greg Kroah-Hartman

IIO: Move core headers to include/linux/iio

2012-04-25T18:01:43+00:00

Step 1 in moving the IIO core out of staging.

Signed-off-by: Jonathan Cameron 
Signed-off-by: Greg Kroah-Hartman