linux-stable.git/include/linux/iio/types.h, branch v5.7

iio: core: add thermocouple_type standard attribute

2019-11-23T12:35:19+00:00

We have a couple of thermocouple IIO drivers, supporting several chips.
Some of them support only one specific thermocouple type (e.g. "K", "J"),
one of them can be configured to work with several different thermocouple
types.

In certain applications thermocouples could be externally connected to the
chip by the user.

This patch introduces a new IIO standard attribute to report the supported
thermocouple type and, where applicable, to allow it to be dynamically set
using sysfs.

Cc: Hartmut Knaack 
Cc: Lars-Peter Clausen 
Cc: Peter Meerwald-Stadler 
Cc: Colin Ian King 
Cc: Patrick Havelange 
Cc: Matt Weber 
Cc: Matt Ranostay 
Cc: Chuhong Yuan 
Cc: Daniel Gomez 
Cc: linux-iio@vger.kernel.org
Signed-off-by: Andrea Merello 
Signed-off-by: Jonathan Cameron

iio: core: add char type for sysfs attributes

2019-11-23T12:33:07+00:00

This patch introduces IIO_VAL_CHAR type for standard IIO attributes to
allow for attributes that needs to be represented by character rather
than a number. This is preparatory for introducing a new attribute whose
purpose is to describe thermocouple type, that can be i.e. "J", "K", etc..

The char-type value is stored in the first "value" integer that is passed
to the .[read/write]_raw() callbacks.

Note that in order to make it possible for the IIO core to correctly parse
this type (actually, to avoid integer parsing), it became mandatory for
any driver that wish to use IIO_VAL_CHAR on a writable attribute to
implement .write_raw_get_fmt().

Cc: Hartmut Knaack 
Cc: Lars-Peter Clausen 
Cc: Peter Meerwald-Stadler 
Cc: Colin Ian King 
Cc: Patrick Havelange 
Cc: Matt Weber 
Cc: Matt Ranostay 
Cc: Chuhong Yuan 
Cc: Daniel Gomez 
Cc: linux-iio@vger.kernel.org
Signed-off-by: Andrea Merello 
Signed-off-by: Jonathan Cameron

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500

2019-06-19T15:09:55+00:00

Based on 2 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license version 2 as
  published by the free software foundation

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license version 2 as
  published by the free software foundation #

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 4122 file(s).

Signed-off-by: Thomas Gleixner 
Reviewed-by: Enrico Weigelt 
Reviewed-by: Kate Stewart 
Reviewed-by: Allison Randal 
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de
Signed-off-by: Greg Kroah-Hartman

IIO: inkern: API for manipulating channel attributes

2018-01-10T10:30:08+00:00

Extend the inkern API with functions for reading and writing
attribute of iio channels.

Signed-off-by: Arnaud Pouliquen 
Reviewed-by: Jonathan Cameron 
Signed-off-by: Mark Brown

iio:core: add a callback to allow drivers to provide _available attributes

2016-11-13T11:40:25+00:00

A large number of attributes can only take a limited range of values.
Currently in IIO this is handled by directly registering additional
*_available attributes thus providing this information to userspace.

It is desirable to provide this information via the core for much the same
reason this was done for the actual channel information attributes in the
first place.  If it isn't there, then it can only really be accessed from
userspace.  Other in kernel IIO consumers have no access to what valid
parameters are.

Two forms are currently supported:
* list of values in one particular IIO_VAL_* format.
	e.g. 1.300000 1.500000 1.730000
* range specification with a step size:
	e.g. [1.000000 0.500000 2.500000]
	equivalent to 1.000000 1.5000000 2.000000 2.500000

An addition set of masks are used to allow different sharing rules for the
*_available attributes generated.

This allows for example:

in_accel_x_offset
in_accel_y_offset
in_accel_offset_available.

We could have gone with having a specification for each and every
info_mask element but that would have meant changing the existing userspace
ABI.  This approach does not.

Signed-off-by: Jonathan Cameron 
[forward ported, added some docs and fixed buffer overflows /peda]
Acked-by: Daniel Baluta 
Signed-off-by: Peter Rosin 
Signed-off-by: Jonathan Cameron

iio: core: add high pass filter attributes

2015-05-17T09:32:35+00:00

Add a high pass filter attribute for measurements
(like the existing low pass)

Also add both high and low pass attributes for events.

Signed-off-by: Martin Fuzzey 
Signed-off-by: Jonathan Cameron

iio: Export userspace IIO headers

2015-02-14T17:05:03+00:00

After UAPI header file split [1] all user-kernel interfaces were
placed under include/uapi/.

This patch moves IIO user specific API from:
	* include/linux/iio/events.h => include/uapi/linux/iio/events.h
	* include/linux/types.h => include/uapi/linux/types.h

Now there is no need for nasty tricks to compile userspace programs
(e.g iio_event_monitor). Just installing the kernel headers with
make headers_install command does the job.

[1] http://lwn.net/Articles/507794/

Signed-off-by: Daniel Baluta 
Signed-off-by: Jonathan Cameron

iio: core: Remove IIO_EV_TYPE_INSTANCE

2015-01-27T18:49:55+00:00

By introducing IIO_EV_TYPE_CHANGE, IIO_EV_TYPE_INSTANCE becomes redundant.
The effect of IIO_EV_TYPE_INSTANCE can be obtained by using IIO_EV_TYPE_CHANGE
with IIO_EV_INFO_VALUE set to 1.

Remove all instances of IIO_EV_TYPE_INSTANCE and replace them with
IIO_EV_TYPE_CHANGE where needed.

Signed-off-by: Irina Tirdea 
Signed-off-by: Jonathan Cameron

iio: core: Introduce CHANGE event type

2015-01-27T18:49:55+00:00

A step detector will generate an interrupt each time N step are detected.
A device that has such pedometer functionality is Freescale's MMA9553L:
http://www.freescale.com/files/sensors/doc/ref_manual/MMA9553LSWRM.pdf.

Introduce IIO_EV_TYPE_CHANGE event type for events that are generated
when the channel passes a threshold on the absolute change in value.

Signed-off-by: Irina Tirdea 
Signed-off-by: Jonathan Cameron

iio: core: Introduce IIO_VELOCITY and IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z

2015-01-27T18:49:54+00:00

Some devices export the current speed value of the user.

One of this devices is Freescale's MMA9553L
(http://www.freescale.com/files/sensors/doc/ref_manual/MMA9553LSWRM.pdf)
that computes the speed of the user based on the number of steps and
stride length.

Introduce a new channel type VELOCITY and a modifier for the magniture or
norm of the velocity vector, IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z.

Signed-off-by: Irina Tirdea 
Signed-off-by: Jonathan Cameron