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adbmouse: only send first two bytes in standard/classic protocol as per spec

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Fixes any mouse driver that only supports the classic protocol and expects register 0 reads to return two bytes.
This commit is contained in:
Rairii 2024-07-29 11:37:54 +01:00
parent 6f62f9dd98
commit 4d7c520f18
1 changed files with 9 additions and 1 deletions
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10
devices/common/adb/adbmouse.cpp
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@ -100,7 +100,15 @@ bool AdbMouse::get_register_0() {
this->y_rel = 0;
this->changed = false;
this->host_obj->set_output_count(p - out_buf);
uint8_t count = (uint8_t)(p - out_buf);
// should never happen, but check just in case
if (((size_t)p - (size_t)out_buf) > UINT8_MAX)
count = UINT8_MAX;
// if the mouse is in standard protocol then only send first 2 bytes
// BUGBUG: what should tablet do here?
if (this->device_class == MOUSE && this->dev_handler_id == 1)
count = 2;
this->host_obj->set_output_count(count);
return true;
}