Updates and fixes.

- Implement fix for keyboards not switching to boot mode properly, until full report parsing gets done.
  This is expected to improve support for certain models that were reported problematic.
- Implement fix for mouse acceleration omitting absolute mode
- Provide pass_to_os = true to not capture shift+backspace from the OS, it's annoying when you hold shift
  and mistype something, then want to use backspace but couldn't.

src/keyboard.c

@@ -55,6 +55,7 @@ hotkey_combo_t hotkeys[] = {
     {.modifier       = KEYBOARD_MODIFIER_RIGHTSHIFT,
      .keys           = {HID_KEY_BACKSPACE},
      .key_count      = 1,
+     .pass_to_os     = true,
      .action_handler = &output_config_hotkey_handler},
 
     /* Erase stored config */
@@ -191,6 +192,12 @@ void process_keyboard_report(uint8_t *raw_report, int length, device_t *state) {
     if (length < KBD_REPORT_LENGTH)
         return;
 
+    /* If the report is longer by 1 byte, we can assume the first byte is the report ID
+       and that the keyboard didn't switch to boot mode properly. Use this workaround
+       until full HID report parsing is implemented */
+    if (length == KBD_REPORT_LENGTH + 1)
+        keyboard_report = (hid_keyboard_report_t *)(raw_report + 1);
+
     /* Check if any hotkey was pressed */
     hotkey = check_all_hotkeys(keyboard_report, state);
 

src/mouse.c

@@ -52,7 +52,7 @@ int32_t accelerate(int32_t offset) {
         return offset;
 
     for (int i = 0; i < 7; i++) {
-        if (offset < acceleration[i].value) {
+        if (abs(offset) < acceleration[i].value) {
             return offset * acceleration[i].factor;
         }
     }

src/usb.c

@@ -103,6 +103,9 @@ void tuh_hid_mount_cb(uint8_t dev_addr, uint8_t instance, uint8_t const *desc_re
 
     switch (itf_protocol) {
         case HID_ITF_PROTOCOL_KEYBOARD:
+            if (ENFORCE_PORTS && BOARD_ROLE == PICO_B)
+                return;
+
             /* Keeping this is required for setting leds from device set_report callback */
             global_state.kbd_dev_addr       = dev_addr;
             global_state.kbd_instance       = instance;
@@ -110,6 +113,9 @@ void tuh_hid_mount_cb(uint8_t dev_addr, uint8_t instance, uint8_t const *desc_re
             break;
 
         case HID_ITF_PROTOCOL_MOUSE:
+            if (ENFORCE_PORTS && BOARD_ROLE == PICO_A)
+                return;
+
             /* Switch to using protocol report instead of boot report, it's more complicated but
                at least we get all the information we need (looking at you, mouse wheel) */
             if (tuh_hid_get_protocol(dev_addr, instance) == HID_PROTOCOL_BOOT) {

src/user_config.h

@@ -158,3 +158,17 @@
 
 #define OUTPUT_A_OS LINUX
 #define OUTPUT_B_OS LINUX
+
+/**================================================== *
+ * =================  Enforce Ports ================= *
+ * ==================================================
+ *
+ * If enabled, fixes some device incompatibilities by
+ * enforcing keyboard has to be in port A and mouse in port B.
+ *
+ * ENFORCE_PORTS: [0, 1] - 1 means keyboard has to plug in A and mouse in B
+ *                         0 means no such layout is enforced
+ *
+ * */
+
+#define ENFORCE_PORTS 0