From bb2e4da9d97c6294d307dfe1123895ec9f2feefb Mon Sep 17 00:00:00 2001
From: j4nn <531585+j4nn@users.noreply.github.com>
Date: Sat, 11 Oct 2025 12:43:07 +0200
Subject: [PATCH] add support for usb mass storage mode for micro SD card

be sure to configure usb mass storage gadget parameters in advance
in order to avoid not working defaults with cdrom limitations
---
 recovery/root/init.recovery.usb.rc | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/recovery/root/init.recovery.usb.rc b/recovery/root/init.recovery.usb.rc
index b9a29fd..1b1e36f 100644
--- a/recovery/root/init.recovery.usb.rc
+++ b/recovery/root/init.recovery.usb.rc
@@ -38,6 +38,11 @@ on fs
     write /config/usb_gadget/g1/strings/0x409/serialnumber ${ro.serialno}
     write /config/usb_gadget/g1/strings/0x409/manufacturer ${ro.product.manufacturer}
     write /config/usb_gadget/g1/strings/0x409/product ${ro.product.model}
+    mkdir /config/usb_gadget/g1/functions/mass_storage.0
+    mkdir /config/usb_gadget/g1/functions/mass_storage.0/lun.0
+    write /config/usb_gadget/g1/functions/mass_storage.0/lun.0/removable 1
+    write /config/usb_gadget/g1/functions/mass_storage.0/lun.0/cdrom 0
+    write /config/usb_gadget/g1/functions/mass_storage.0/lun.0/ro 0
     mkdir /config/usb_gadget/g1/functions/ffs.adb
     mkdir /config/usb_gadget/g1/functions/ffs.fastboot
     mkdir /config/usb_gadget/g1/functions/ffs.mtp
@@ -46,6 +51,7 @@ on fs
     write /config/usb_gadget/g1/configs/b.1/MaxPower 900
     write /config/usb_gadget/g1/os_desc/b_vendor_code 0x1
     write /config/usb_gadget/g1/os_desc/qw_sign "MSFT100"
+    symlink /config/usb_gadget/g1/configs/b.1 /config/usb_gadget/g1/os_desc/b.1
     mkdir /dev/usb-ffs 0775 shell system
     mkdir /dev/usb-ffs/adb 0770 shell system
     mkdir /dev/usb-ffs/mtp 0770 mtp mtp
@@ -62,6 +68,9 @@ on property:sys.usb.config=adb
 on property:sys.usb.config=mtp,adb
     start adbd
 
+on property:sys.usb.config=mass_storage,adb
+    start adbd
+
 on property:sys.usb.config=fastboot
     start fastbootd
 
@@ -71,6 +80,7 @@ on property:sys.usb.config=none
     stop fastbootd
     setprop sys.usb.ffs.ready 0
     rm /config/usb_gadget/g1/configs/b.1/f1
+    rm /config/usb_gadget/g1/configs/b.1/f2
     rm /config/usb_gadget/g1/configs/b.1/ffs.mtp
     setprop sys.usb.state ${sys.usb.config}
 
@@ -96,6 +106,14 @@ on property:sys.usb.config=mtp,adb && property:sys.usb.ffs.ready=1
     write /config/usb_gadget/g1/UDC ${sys.usb.controller}
     setprop sys.usb.state ${sys.usb.config}
 
+on property:sys.usb.config=mass_storage,adb && property:sys.usb.ffs.ready=1
+    write /config/usb_gadget/g1/idProduct 0x685E
+    write /config/usb_gadget/g1/configs/b.1/strings/0x409/configuration "msc,adb"
+    symlink /config/usb_gadget/g1/functions/mass_storage.0 /config/usb_gadget/g1/configs/b.1/f1
+    symlink /config/usb_gadget/g1/functions/ffs.adb /config/usb_gadget/g1/configs/b.1/f2
+    write /config/usb_gadget/g1/UDC ${sys.usb.controller}
+    setprop sys.usb.state ${sys.usb.config}
+
 on property:sys.usb.config=fastboot && property:sys.usb.ffs.ready=1
     write /config/usb_gadget/g1/idProduct 0xD001
     write /config/usb_gadget/g1/configs/b.1/strings/0x409/configuration "fastboot"