linux-stable.git/include/linux/iio/types.h, branch v3.12

iio: Add pressure channel type

2012-11-20T21:26:38+00:00

This patch adds support for a new IIO channel type for pressure measurements.
This can for example be used for barometric pressure sensors.

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

iio: Add a logarithmic fractional value type

2012-10-19T17:46:51+00:00

For ADCs or DACs the denominator for fractional types often is a power of two.
In this case we can use a shift operation instead of the rather expensive 64 bit
division. This patch adds a new fractional type which expects the denominator to
be specified as the log2 of the actual denominator. E.g. for ADCs and DACs this
will usually be the number of significant bits.

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 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