linux-stable.git/drivers/input/touchscreen/of_touchscreen.c, branch master

Input: touchscreen - move helper functions to core

2021-03-25T18:14:09+00:00

Some devices outside of drivers/input/touchscreen/ can still make
use of the touchscreen helper functions. Therefore, it was agreed
in [1] to move them outside of drivers/input/touchscreen/ so that
other devices can call them without INPUT_TOUCHSCREEN being set.

As part of this change, 'of' is dropped from the filename because
the helpers no longer actually use OF. No changes are made to the
file contents whatsoever.

Based on the feedback in [2], the corresponding binding documents
(touchscreen.yaml and touchscreen.txt) are left in their original
locations.

[1] https://patchwork.kernel.org/patch/11924029/
[2] https://patchwork.kernel.org/patch/12042037/

Signed-off-by: Jeff LaBundy 
Link: https://lore.kernel.org/r/20210301234928.4298-2-jeff@labundy.com
Signed-off-by: Dmitry Torokhov

Input: of_touchscreen - explicitly choose axis

2020-03-24T22:21:24+00:00

The 'axis + 1' calculation is implicit and potentially error prone.
Moreover, few lines before the axis is set explicitly for both X and Y.

Do the same when retrieving different properties for X and Y.

Signed-off-by: Andy Shevchenko 
Link: https://lore.kernel.org/r/20200303180917.12563-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Dmitry Torokhov

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

Input: of_touchscreen - add support for touchscreen-min-x|y

2018-10-12T00:16:42+00:00

Some touchscreens, depending on the firmware and/or the digitizer, report
coordinates which never reach 0 along one or both of their axis.

This has been seen for example on the Silead touchscreens on a Onda V891w
and a Point of View mobii TAB-P800w(v2.0).

This commit adds support for touchscreen-min-x and touchscreen-min-y
device-properties which can be set to communicate the actual start
coordinates (rather then 0,0) to userspace.

This commit also drop the "(in pixels)" comment from the documentation
of the touchscreen-size-x and touchscreen-size-y properties. The comment
suggested that there is a relation between the range of reported
coordinates and the display resolution, which is only true for some
devices. The "(in pixels)" comment is replaced with "(maximum x coordinate
reported + 1)" to mirror the language describing the new touchscreen-min-x
and -min-y properties.

When set this fixes e.g. not being able to click things in the GNOME3
top-bar on the 2 example tablets.

Signed-off-by: Hans de Goede 
Reviewed-by: Rob Herring 
Signed-off-by: Dmitry Torokhov

Input: of_touchscreen - add MODULE_LICENSE

2018-01-11T00:38:12+00:00

The lack of the MODULE_LICENSE tag can lead to a warning here:

WARNING: modpost: missing MODULE_LICENSE() in drivers/input/touchscreen/of_touchscreen.o

I'm adding a license and description tag, but no MODULE_AUTHOR()
as this file is a collection of standalone helper functions that
were all added by different developers.

Signed-off-by: Arnd Bergmann 
Signed-off-by: Dmitry Torokhov

Input: of_touchscreen - add support for inverted / swapped axes

2016-07-15T21:50:53+00:00

Extend touchscreen_parse_properties() with support for the
touchscreen-inverted-x/y and touchscreen-swapped-x-y properties and
add touchscreen_set_mt_pos() and touchscreen_report_pos() helper
functions for storing coordinates into a input_mt_pos struct, or
directly reporting them, taking these properties into account.

This commit also modifies the existing callers of
touchscreen_parse_properties() to pass in NULL for the new third
argument, keeping the existing behavior.

Signed-off-by: Hans de Goede 
Signed-off-by: Dmitry Torokhov

Input: of_touchscreen - switch to using device properties

2015-07-12T00:26:45+00:00

Let's switch form OF to device properties so that common parsing code could
work not only on device tree but also on ACPI-based platforms.

Reviewed-by: Roger Quadros 
Signed-off-by: Dmitry Torokhov

Input: of_touchscreen - fix setting max values on X/Y axis

2015-07-12T00:26:37+00:00

The binding specification says that "touchscreen-size-x" and "-y" specify
horizontal and vertical resolution of the touchscreen and therefore maximum
absolute coordinates should be reduced by 1 since we are starting with 0.

Reviewed-by: Roger Quadros 
Signed-off-by: Dmitry Torokhov

Input: of_touchscreen - always issue warning if axis is not set up

2015-07-12T00:26:13+00:00

Do issue warning about axis that is present in device tree but not specified
by the driver even in case of multi-touch axis as callers now tell us if they
expect multi-touch data or not.

Reviewed-by: Roger Quadros 
Signed-off-by: Dmitry Torokhov

Input: improve parsing OF parameters for touchscreens

2015-06-25T21:45:46+00:00

When applying touchscreen parameters specified in device tree let's make
sure we keep whatever setup was done by the driver and not reset the
missing values to zero.

Reported-by: Pavel Machek 
Tested-by: Pavel Machek 
Signed-off-by: Dmitry Torokhov