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HID: multitouch: Add quirks for flipped axes 

Certain touchscreen devices, such as the ELAN9034, are oriented
incorrectly and report touches on opposite points on the X and Y axes.
For example, a 100x200 screen touched at (10,20) would report (90, 180)
and vice versa.

This is fixed by adding device quirks to transform the touch points
into the correct spaces, from X -> MAX(X) - X, and Y -> MAX(Y) - Y.

Signed-off-by: Allen Ballway <ballway@chromium.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Allen Ballway 2023-01-10 20:25:50 +00:00 committed by Jiri Kosina
parent d264dd3bbb
commit a2f416bf06
4 changed files with 87 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

39
drivers/hid/hid-multitouch.c
View File

@ -71,6 +71,7 @@ MODULE_LICENSE("GPL");
#define MT_QUIRK_SEPARATE_APP_REPORT BIT(19)
#define MT_QUIRK_FORCE_MULTI_INPUT BIT(20)
#define MT_QUIRK_DISABLE_WAKEUP BIT(21)
#define MT_QUIRK_ORIENTATION_INVERT BIT(22)
#define MT_INPUTMODE_TOUCHSCREEN 0x02
#define MT_INPUTMODE_TOUCHPAD 0x03
@ -1009,6 +1010,7 @@ static int mt_process_slot(struct mt_device *td, struct input_dev *input,
struct mt_usages *slot)
{
struct input_mt *mt = input->mt;
struct hid_device *hdev = td->hdev;
__s32 quirks = app->quirks;
bool valid = true;
bool confidence_state = true;
@ -1086,6 +1088,10 @@ static int mt_process_slot(struct mt_device *td, struct input_dev *input,
int orientation = wide;
int max_azimuth;
int azimuth;
int x;
int y;
int cx;
int cy;
if (slot->a != DEFAULT_ZERO) {
/*
@ -1104,6 +1110,9 @@ static int mt_process_slot(struct mt_device *td, struct input_dev *input,
if (azimuth > max_azimuth * 2)
azimuth -= max_azimuth * 4;
orientation = -azimuth;
if (quirks & MT_QUIRK_ORIENTATION_INVERT)
orientation = -orientation;
}
if (quirks & MT_QUIRK_TOUCH_SIZE_SCALING) {
@ -1115,10 +1124,23 @@ static int mt_process_slot(struct mt_device *td, struct input_dev *input,
minor = minor >> 1;
}
input_event(input, EV_ABS, ABS_MT_POSITION_X, *slot->x);
input_event(input, EV_ABS, ABS_MT_POSITION_Y, *slot->y);
input_event(input, EV_ABS, ABS_MT_TOOL_X, *slot->cx);
input_event(input, EV_ABS, ABS_MT_TOOL_Y, *slot->cy);
x = hdev->quirks & HID_QUIRK_X_INVERT ?
input_abs_get_max(input, ABS_MT_POSITION_X) - *slot->x :
*slot->x;
y = hdev->quirks & HID_QUIRK_Y_INVERT ?
input_abs_get_max(input, ABS_MT_POSITION_Y) - *slot->y :
*slot->y;
cx = hdev->quirks & HID_QUIRK_X_INVERT ?
input_abs_get_max(input, ABS_MT_POSITION_X) - *slot->cx :
*slot->cx;
cy = hdev->quirks & HID_QUIRK_Y_INVERT ?
input_abs_get_max(input, ABS_MT_POSITION_Y) - *slot->cy :
*slot->cy;
input_event(input, EV_ABS, ABS_MT_POSITION_X, x);
input_event(input, EV_ABS, ABS_MT_POSITION_Y, y);
input_event(input, EV_ABS, ABS_MT_TOOL_X, cx);
input_event(input, EV_ABS, ABS_MT_TOOL_Y, cy);
input_event(input, EV_ABS, ABS_MT_DISTANCE, !*slot->tip_state);
input_event(input, EV_ABS, ABS_MT_ORIENTATION, orientation);
input_event(input, EV_ABS, ABS_MT_PRESSURE, *slot->p);
@ -1735,6 +1757,15 @@ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
if (id->vendor == HID_ANY_ID && id->product == HID_ANY_ID)
td->serial_maybe = true;
/* Orientation is inverted if the X or Y axes are
* flipped, but normalized if both are inverted.
*/
if (hdev->quirks & (HID_QUIRK_X_INVERT | HID_QUIRK_Y_INVERT) &&
!((hdev->quirks & HID_QUIRK_X_INVERT)
&& (hdev->quirks & HID_QUIRK_Y_INVERT)))
td->mtclass.quirks = MT_QUIRK_ORIENTATION_INVERT;
/* This allows the driver to correctly support devices
* that emit events over several HID messages.
*/

6
drivers/hid/hid-quirks.c
View File

@ -19,6 +19,7 @@
#include <linux/input/elan-i2c-ids.h>
#include "hid-ids.h"
#include "i2c-hid/i2c-hid.h"
/*
* Alphabetically sorted by vendor then product.
@ -1298,6 +1299,11 @@ unsigned long hid_lookup_quirk(const struct hid_device *hdev)
quirks = hid_gets_squirk(hdev);
mutex_unlock(&dquirks_lock);
/* Get quirks specific to I2C devices */
if (IS_ENABLED(CONFIG_I2C_DMI_CORE) && IS_ENABLED(CONFIG_DMI) &&
hdev->bus == BUS_I2C)
quirks |= i2c_hid_get_dmi_quirks(hdev->vendor, hdev->product);
return quirks;
}
EXPORT_SYMBOL_GPL(hid_lookup_quirk);

43
drivers/hid/i2c-hid/i2c-hid-dmi-quirks.c
View File

@ -10,8 +10,10 @@
#include <linux/types.h>
#include <linux/dmi.h>
#include <linux/mod_devicetable.h>
#include <linux/hid.h>
#include "i2c-hid.h"
#include "../hid-ids.h"
struct i2c_hid_desc_override {
@ -416,6 +418,28 @@ static const struct dmi_system_id i2c_hid_dmi_desc_override_table[] = {
{ } /* Terminate list */
};
static const struct hid_device_id i2c_hid_elan_flipped_quirks = {
HID_DEVICE(BUS_I2C, HID_GROUP_MULTITOUCH_WIN_8, USB_VENDOR_ID_ELAN, 0x2dcd),
HID_QUIRK_X_INVERT | HID_QUIRK_Y_INVERT
};
/*
* This list contains devices which have specific issues based on the system
* they're on and not just the device itself. The driver_data will have a
* specific hid device to match against.
*/
static const struct dmi_system_id i2c_hid_dmi_quirk_table[] = {
{
.ident = "DynaBook K50/FR",
.matches = {
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dynabook Inc."),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "dynabook K50/FR"),
},
.driver_data = (void *)&i2c_hid_elan_flipped_quirks,
},
{ } /* Terminate list */
};
struct i2c_hid_desc *i2c_hid_get_dmi_i2c_hid_desc_override(uint8_t *i2c_name)
{
@ -450,3 +474,22 @@ char *i2c_hid_get_dmi_hid_report_desc_override(uint8_t *i2c_name,
*size = override->hid_report_desc_size;
return override->hid_report_desc;
}
u32 i2c_hid_get_dmi_quirks(const u16 vendor, const u16 product)
{
u32 quirks = 0;
const struct dmi_system_id *system_id =
dmi_first_match(i2c_hid_dmi_quirk_table);
if (system_id) {
const struct hid_device_id *device_id =
(struct hid_device_id *)(system_id->driver_data);
if (device_id && device_id->vendor == vendor &&
device_id->product == product)
quirks = device_id->driver_data;
}
return quirks;
}
EXPORT_SYMBOL_GPL(i2c_hid_get_dmi_quirks);

3
drivers/hid/i2c-hid/i2c-hid.h
View File

@ -9,6 +9,7 @@
struct i2c_hid_desc *i2c_hid_get_dmi_i2c_hid_desc_override(uint8_t *i2c_name);
char *i2c_hid_get_dmi_hid_report_desc_override(uint8_t *i2c_name,
unsigned int *size);
u32 i2c_hid_get_dmi_quirks(const u16 vendor, const u16 product);
#else
static inline struct i2c_hid_desc
*i2c_hid_get_dmi_i2c_hid_desc_override(uint8_t *i2c_name)
@ -16,6 +17,8 @@ static inline struct i2c_hid_desc
static inline char *i2c_hid_get_dmi_hid_report_desc_override(uint8_t *i2c_name,
unsigned int *size)
{ return NULL; }
static inline u32 i2c_hid_get_dmi_quirks(const u16 vendor, const u16 product)
{ return 0; }
#endif
/**