linux-toradex.git/drivers/input/touchscreen/sun4i-ts.c, branch v4.1.10

Input: sun4i-ts - allow controlling filter and sensitivity via DT

2015-03-23T16:11:11+00:00

This commit introduces two new optional device-tree properties:
"tp-sensitive-adjust": adjust sensitivity of pen down detection
"filter-type": select median and averaging filter

The previous fixed defaults, didn't work well for the Olimex
A13-LCD10TS (I have).

Signed-off-by: Jens Thiele 
Reviewed-by: Hans de Goede 
Signed-off-by: Dmitry Torokhov

Input: sun4i-ts - really fix A10 temperature reporting

2015-03-12T21:53:10+00:00

The commit titled: "Input: sun4i-ts -  A10 (sun4i) has a different
temperature curve" contains a math error, the offset it uses is in degrees,
but the actual code applies the offset before multiplying by stepsize :|

Given that this is rather backwards (every math course ever thought applies
the multiplication before the offset for linear functions), this commit
fixes things by changing the code applying the offset to do the logical
thing, adjusting the offset for the other models accordingly.

This has been tested on an A10, A13, A20 and A31 to make sure everything
really is correct now.

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

Input: sun4i-ts - A10 (sun4i) has a different temperature curve

2015-03-08T21:16:59+00:00

Testing has revealed that the temperature in the rtp controller of the A10
(sun4i) SoC has a different curve then on the A13 (sun5i) and later models.

Add a new sun5i-a13-ts compatible to differentiate the newer models and
set the curve based on the compatible string.

The new curve is still not ideal on all A10-s, that seems to have to
do with there being a large spread between different A10-s out there,
the new curve us based on callibration results on 4 completely different
models:
                        raw min raw max temp min temp max stepsize offset
Tong Zhang's hackberry    2402    2680    45.0     80.0    0.125   -255.3
Hansg's Cubieboard        2207    2300    36.0     45.0    0.096   -175.8
Olliver's lime 1 (*):     2258    2537    48.3     87.1    0.139   -265.7
Olliver's lime 2 (*):     2222    2486    46.7     91.7    0.170   -331.0
*) from: http://linux-sunxi.org/Temperature_Calibration

Average all 4:                                             0.133   -257.0
Average without outliers (middle 2):                       0.132   -261.0

Since it is better to slightly overreport the temperature this patch uses
the average of all 4 as curve.

This fixes the temperature reported on the A10 being much higher then
expected.

Reported-by: Tong Zhang 
Signed-off-by: Hans de Goede 
Signed-off-by: Dmitry Torokhov

Input: sun4i-ts - add support for touchpanel controller on A31

2015-01-27T07:58:56+00:00

The Allwinner A31 SoC (sun6i) has the same resistive touchpanel controller
as on other sunxi platforms. The only difference between the variants is
the control bits for enabling operations are left-shifted by 1 on the A31.

Also update the comment for the original temperature sensor with
information from Allwinner.

Signed-off-by: Chen-Yu Tsai 
Signed-off-by: Dmitry Torokhov

Input: sun4i-ts - add thermal zone sensor support

2015-01-18T08:10:27+00:00

The touchscreen controller has a temperature sensor embedded in the SoC,
which already has hwmon support in the driver.

Add DT thermal zone support so we can use it with cpufreq for thermal
throttling.

This also adds a comment stating that we do not know the actual formula
for calculating the temperature.

Signed-off-by: Chen-Yu Tsai 
Acked-by: Eduardo Valentin 
Signed-off-by: Dmitry Torokhov

input: touchscreen: drop owner assignment from platform_drivers

2014-10-20T14:20:41+00:00

A platform_driver does not need to set an owner, it will be populated by the
driver core.

Signed-off-by: Wolfram Sang

Input: sun4i-ts - add support for temperature sensor

2014-05-14T23:40:06+00:00

The sun4i resisitive touchscreen controller also comes with a built-in
temperature sensor. This commit adds support for it.

This commit also introduces a new "ts-attached" device-tree property,
when this is not set, the input part of the driver won't register. This way
the internal temperature sensor can be used to measure the SoC temperature
independent of there actually being a touchscreen attached to the controller.

Signed-off-by: Hans de Goede 
Reviewed-by: Guenter Roeck 
Acked-by: Maxime Ripard 
Signed-off-by: Dmitry Torokhov

Input: add driver for Allwinner sunxi SoC's rtp controller

2014-05-14T23:40:06+00:00

Note the sun4i-ts controller is capable of detecting a second touch, but
when a second touch is present then the accuracy becomes so bad the
reported touch location is not useable.

The original android driver contains some complicated heuristics using the
aprox. distance between the 2 touches to see if the user is making a pinch
open / close movement, and then reports emulated multi-touch events around
the last touch coordinate (as the dual-touch coordinates are worthless).

These kinds of heuristics are just asking for trouble (and don't belong in
the kernel). So this driver offers straight forward, reliable single touch
functionality only.

Signed-off-by: Hans de Goede 
Acked-by: Maxime Ripard 
Signed-off-by: Dmitry Torokhov