VectorKappa/universal-pidff
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Explain the mapping function better

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This commit is contained in:
Tomasz Pakuła
2024-08-15 16:32:09 +02:00
committed by Makarenko Oleg
parent 51982fd1e2
commit baf35a36f0
1 changed files with 18 additions and 12 deletions
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30
hid-pidff-wrapper.c
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@@ -57,7 +57,9 @@ static u8 *universal_pidff_report_fixup(struct hid_device *hdev, __u8 *rdesc,
return rdesc;
}
/*
* Map buttons manually to extend the default joystick buttn limit
*/
static int universal_pidff_input_mapping(struct hid_device *hdev, struct hid_input *hi,
struct hid_field *field, struct hid_usage *usage,
unsigned long **bit, int *max)
@@ -66,21 +68,25 @@ static int universal_pidff_input_mapping(struct hid_device *hdev, struct hid_inp
if ((usage->hid & HID_USAGE_PAGE) != HID_UP_BUTTON)
return 0;
int code = ((usage->hid - 1) & HID_USAGE);
int new_code = code + BTN_0;
int button = ((usage->hid - 1) & HID_USAGE);
int code = button + BTN_0;
if (new_code > BTN_9)
new_code = code + BTN_JOYSTICK - BTN_RANGE;
// Detect the end of BTN_* range
if (code > BTN_9)
code = button + BTN_JOYSTICK - BTN_RANGE;
if (new_code > BTN_DEAD)
new_code = code + KEY_MACRO1 - BTN_RANGE - JOY_RANGE;
// Detect the end of JOYSTICK buttons range
if (code > BTN_DEAD)
code = button + KEY_MACRO1 - BTN_RANGE - JOY_RANGE;
// Map overflowing buttons to KEY_RESERVED for the upcomng new input usages
if (new_code > KEY_MAX)
new_code = KEY_RESERVED;
// Map overflowing buttons to KEY_RESERVED for the upcoming new input event
// It will handle button presses differently and won't depend on defined
// ranges. KEY_RESERVED usage is needed for the button to not be ignored.
if (code > KEY_MAX)
code = KEY_RESERVED;
hid_map_usage(hi, usage, bit, max, EV_KEY, new_code);
hid_dbg(hdev, "Button %d: usage %d", code, new_code);
hid_map_usage(hi, usage, bit, max, EV_KEY, code);
hid_dbg(hdev, "Button %d: usage %d", button, code);
return 1;
}