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Input: goodix - add axis swapping and axis inversion support 

Implement support for the following device-tree and ACPI 5.1 DSD
properties in the goodix touchscreen driver:

 - touchscreen-inverted-x:  X axis is inverted (boolean)
 - touchscreen-inverted-y:  Y axis is inverted (boolean)
 - touchscreen-swapped-x-y: X and Y axis are swapped (boolean)

These are necessary on tablets which have a display in portrait
format while the touchscreen is in landscape format, such as e.g.
the MSI Primo 81.

Signed-off-by: Karsten Merker <merker@debian.org>
Tested-by: Bastien Nocera <hadess@hadess.net>
Tested-by: Irina Tirdea <irina.tirdea@intel.com> (with ACPI DSD properties)
Tested-by: Aleksei Mamlin <mamlinav@gmail.com> (with device-tree properties)
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Karsten Merker 2015-12-17 17:02:53 -08:00 committed by Dmitry Torokhov
parent 5d655b3546
commit ad48cf5e95
2 changed files with 30 additions and 0 deletions
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5
Documentation/devicetree/bindings/input/touchscreen/goodix.txt
View File

@ -19,6 +19,11 @@ Optional properties:
interrupt gpio pin as output to reset the device.
- reset-gpios : GPIO pin used for reset
- touchscreen-inverted-x : X axis is inverted (boolean)
- touchscreen-inverted-y : Y axis is inverted (boolean)
- touchscreen-swapped-x-y : X and Y axis are swapped (boolean)
(swapping is done after inverting the axis)
Example:
i2c@00000000 {

25
drivers/input/touchscreen/goodix.c
View File

@ -2,6 +2,7 @@
* Driver for Goodix Touchscreens
*
* Copyright (c) 2014 Red Hat Inc.
* Copyright (c) 2015 K. Merker <merker@debian.org>
*
* This code is based on gt9xx.c authored by andrew@goodix.com:
*
@ -35,6 +36,9 @@ struct goodix_ts_data {
struct input_dev *input_dev;
int abs_x_max;
int abs_y_max;
bool swapped_x_y;
bool inverted_x;
bool inverted_y;
unsigned int max_touch_num;
unsigned int int_trigger_type;
bool rotated_screen;
@ -235,6 +239,14 @@ static void goodix_ts_report_touch(struct goodix_ts_data *ts, u8 *coor_data)
input_y = ts->abs_y_max - input_y;
}
/* Inversions have to happen before axis swapping */
if (ts->inverted_x)
input_x = ts->abs_x_max - input_x;
if (ts->inverted_y)
input_y = ts->abs_y_max - input_y;
if (ts->swapped_x_y)
swap(input_x, input_y);
input_mt_slot(ts->input_dev, id);
input_mt_report_slot_state(ts->input_dev, MT_TOOL_FINGER, true);
input_report_abs(ts->input_dev, ABS_MT_POSITION_X, input_x);
@ -486,6 +498,8 @@ static void goodix_read_config(struct goodix_ts_data *ts)
error);
ts->abs_x_max = GOODIX_MAX_WIDTH;
ts->abs_y_max = GOODIX_MAX_HEIGHT;
if (ts->swapped_x_y)
swap(ts->abs_x_max, ts->abs_y_max);
ts->int_trigger_type = GOODIX_INT_TRIGGER;
ts->max_touch_num = GOODIX_MAX_CONTACTS;
return;
@ -493,6 +507,8 @@ static void goodix_read_config(struct goodix_ts_data *ts)
ts->abs_x_max = get_unaligned_le16(&config[RESOLUTION_LOC]);
ts->abs_y_max = get_unaligned_le16(&config[RESOLUTION_LOC + 2]);
if (ts->swapped_x_y)
swap(ts->abs_x_max, ts->abs_y_max);
ts->int_trigger_type = config[TRIGGER_LOC] & 0x03;
ts->max_touch_num = config[MAX_CONTACTS_LOC] & 0x0f;
if (!ts->abs_x_max || !ts->abs_y_max || !ts->max_touch_num) {
@ -500,6 +516,8 @@ static void goodix_read_config(struct goodix_ts_data *ts)
"Invalid config, using defaults\n");
ts->abs_x_max = GOODIX_MAX_WIDTH;
ts->abs_y_max = GOODIX_MAX_HEIGHT;
if (ts->swapped_x_y)
swap(ts->abs_x_max, ts->abs_y_max);
ts->max_touch_num = GOODIX_MAX_CONTACTS;
}
@ -622,6 +640,13 @@ static int goodix_configure_dev(struct goodix_ts_data *ts)
{
int error;
ts->swapped_x_y = device_property_read_bool(&ts->client->dev,
"touchscreen-swapped-x-y");
ts->inverted_x = device_property_read_bool(&ts->client->dev,
"touchscreen-inverted-x");
ts->inverted_y = device_property_read_bool(&ts->client->dev,
"touchscreen-inverted-y");
goodix_read_config(ts);
error = goodix_request_input_dev(ts);