New port: Anbernic RG Nano

A bit of context, this device is a clone of the FunKey-S with a different form factor, hardware is mostly identical, the relevant difference is it has audio out (via usb-c, adapter to 3.5mm is included), this is the reason why the FunKey-SDK is needed for bulding.

This port is based on the old SDL 1.2 code because the device doesn't have SDL2 support. Alongside what was supported in the SDL 1.2 builds this port supports battery level, charging status and backlight control.

Change-Id: I7fcb85be62748644b667c0efebabf59d6e9c5ade

packaging/rgnano/config.cfg

@@ -0,0 +1,7 @@
+# .cfg file created by rockbox c145f41658-250621 - http://www.rockbox.org
+
+idle poweroff: 0
+font: /FunKey/rockbox/fonts/16-WenQangYi-Unibit.fnt
+database scan paths: /Music
+qs top: brightness
+qs bottom: brightness

packaging/rgnano/mapping.key

@@ -0,0 +1,5 @@
+UNMAP         FN+Y
+UNMAP         FN+A
+UNMAP         FN+B
+UNMAP         FN+X
+MAP START+FN  TO KEY      KEY_H

packaging/rgnano/rgnano.make

@@ -0,0 +1,40 @@
+RG_NANO_DIR=$(ROOTDIR)/packaging/rgnano
+MKSQUASHFS=$(dir $(CPP))mksquashfs
+INSTALL_DIR=$(OPK_BUILD_DIR)/install
+OPK_BUILD_DIR=opkdir
+
+opkdir:
+	mkdir $(OPK_BUILD_DIR)
+
+opkclean:
+	rm -rf $(OPK_BUILD_DIR)
+
+opk: opkclean opkdir $(MKSQUASHFS) build
+	make PREFIX=$(OPK_BUILD_DIR)/rockbox fullinstall
+
+	# Install opk files
+	cp $(RG_NANO_DIR)/icon.png $(OPK_BUILD_DIR)
+	cp $(RG_NANO_DIR)/mapping.key $(OPK_BUILD_DIR)
+	cp $(RG_NANO_DIR)/rockbox.funkey-s.desktop $(OPK_BUILD_DIR)
+	cp $(RG_NANO_DIR)/config.cfg $(OPK_BUILD_DIR)
+	cp $(RG_NANO_DIR)/run.sh $(OPK_BUILD_DIR)
+
+	# Organize files
+	mkdir $(INSTALL_DIR)
+	mv $(OPK_BUILD_DIR)/rockbox/bin/rockbox $(INSTALL_DIR)
+	mv $(OPK_BUILD_DIR)/rockbox/lib/rockbox/* $(INSTALL_DIR)
+	mv $(OPK_BUILD_DIR)/rockbox/share/rockbox/* $(INSTALL_DIR)
+
+	rm -rf $(OPK_BUILD_DIR)/rockbox
+	mv $(INSTALL_DIR)/rockbox $(OPK_BUILD_DIR)
+
+	# Plugin workarounds
+	mkdir $(INSTALL_DIR)/rocks.data
+	mv $(INSTALL_DIR)/rocks/games/.picross $(INSTALL_DIR)/rocks.data/.picross
+
+	# Permissions
+	chmod +x $(OPK_BUILD_DIR)/rockbox
+	chmod +x $(OPK_BUILD_DIR)/run.sh
+
+	# Make opk
+	$(MKSQUASHFS) $(OPK_BUILD_DIR) rockbox_funkey-s.opk -all-root -noappend -no-exports -no-xattrs

packaging/rgnano/rockbox.funkey-s.desktop

@@ -0,0 +1,9 @@
+[Desktop Entry]
+Name=Rockbox
+Comment=Open source jukebox firmware
+Terminal=false
+Type=Application
+Exec=run.sh
+Icon=icon
+Categories=applications
+FK-Keymap=mapping.key

packaging/rgnano/run.sh

@@ -0,0 +1,38 @@
+#!/bin/sh
+
+RBDIR=/mnt/FunKey/rockbox
+CFGFILE=$RBDIR/config.cfg
+BLPATH=/sys/class/backlight/backlight/brightness
+
+# Install the rockbox folder
+if [ ! -d $RBDIR ]; then
+  notif set 0 " Installing rockbox..."
+  mkdir -p $RBDIR
+  cp -r ./install/* $RBDIR
+  notif clear
+else
+  OPKV=$(cat ./install/rockbox-info.txt | grep Version: | cut -d'-' -f2)
+  SDV=$(cat $RBDIR/rockbox-info.txt | grep Version: | cut -d'-' -f2)
+
+  if [[ $OPKV -gt  $SDV ]]; then
+    notif set 0 " Updating rockbox..."
+    cp -r -f -u ./install/* $RBDIR
+    notif clear
+  fi
+fi
+
+# Copy default config
+if [ ! -f $CFGFILE ]; then
+  mkdir -p $(dirname $CFGFILE)
+  cp ./config.cfg $CFGFILE
+fi
+
+# Get current volume/brightness -> launch rockbox -> restore previous values
+CUR_VOL=$(volume get)
+CUR_BL=$(cat $BLPATH)
+volume set 100
+
+./rockbox
+
+volume set $CUR_VOL
+echo $CUR_BL > $BLPATH