Plover HID cleanup. (#26262)

quantum/plover_hid.c

@@ -0,0 +1,46 @@
+/* Copyright 2021 dnaq
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <limits.h>
+
+#include "plover_hid.h"
+#include "report.h"
+#include "host.h"
+#include "compiler_support.h"
+
+// The button index handed to plover_hid_update() is `keycode - QK_PLOVER_HID`, so the report's
+// data field must hold a bit for every keycode in the range or the bit-packing below overflows.
+STATIC_ASSERT(sizeof(((report_plover_hid_t *)0)->data) * CHAR_BIT >= (QK_PLOVER_HID_MAX - QK_PLOVER_HID + 1), "Plover HID report data too small for the QK_PLOVER_HID keycode range");
+
+static report_plover_hid_t plover_hid_report         = {.report_id = REPORT_ID_PLOVER_HID};
+static bool                plover_hid_report_updated = false;
+
+void plover_hid_update(uint8_t button, bool pressed) {
+    if (pressed) {
+        plover_hid_report.data[button / 8] |= (1 << (7 - (button % 8)));
+    } else {
+        plover_hid_report.data[button / 8] &= ~(1 << (7 - (button % 8)));
+    }
+    plover_hid_report_updated = true;
+}
+
+void plover_hid_task(void) {
+    if (!plover_hid_report_updated) {
+        return;
+    }
+    host_plover_hid_send(&plover_hid_report);
+    plover_hid_report_updated = false;
+}

quantum/plover_hid.h

@@ -16,5 +16,8 @@
 
 #pragma once
 
+#include <stdint.h>
+#include <stdbool.h>
+
 void plover_hid_update(uint8_t button, bool pressed);
 void plover_hid_task(void);