From d8b4ea1b9d1b1f9b2915b13b2171963f939d3dc2 Mon Sep 17 00:00:00 2001
From: Alrik Vidstrom <a.vidstrom@arduino.cc>
Date: Wed, 20 Sep 2023 18:29:19 +0200
Subject: [PATCH 1/2] Add callback functionality for thumb drive disconnects

Adds callback functionality for thumb drive disconnects that works similarly to the connect
callback functionality.
---
 src/USBHost/USBHost.cpp       | 5 +++++
 src/USBHostMSD/USBHostMSD.cpp | 6 ++++++
 src/USBHostMSD/USBHostMSD.h   | 2 +-
 3 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/src/USBHost/USBHost.cpp b/src/USBHost/USBHost.cpp
index e8138f3..7558909 100644
--- a/src/USBHost/USBHost.cpp
+++ b/src/USBHost/USBHost.cpp
@@ -31,6 +31,7 @@ USBHost * USBHost::instHost = NULL;
 #define MIN(a, b) ((a > b) ? b : a)
 
 extern void (*mount_fnc)(void);
+extern void (*unmount_fnc)(void);
 
 /**
 * How interrupts are processed:
@@ -256,6 +257,10 @@ void USBHost::usb_process()
 
                     } while(0);
 
+                    if (nullptr != unmount_fnc) {
+                        unmount_fnc();
+                    }
+
                     break;
 
                 // a td has been processed
diff --git a/src/USBHostMSD/USBHostMSD.cpp b/src/USBHostMSD/USBHostMSD.cpp
index f8b4ef3..163db54 100644
--- a/src/USBHostMSD/USBHostMSD.cpp
+++ b/src/USBHostMSD/USBHostMSD.cpp
@@ -29,6 +29,7 @@
 #define BO_MASS_STORAGE_RESET   (0xFF)
 
 void (*mount_fnc)(void) = nullptr;
+void (*unmount_fnc)(void) = nullptr;
 
 USBHostMSD::USBHostMSD()
 {
@@ -442,4 +443,9 @@ bool USBHostMSD::attach_detected_callback(void (*cbk)()) {
     return true;
 }
 
+bool USBHostMSD::attach_removed_callback(void (*cbk)()) {
+    unmount_fnc = cbk;
+    return true;
+}
+
 #endif
diff --git a/src/USBHostMSD/USBHostMSD.h b/src/USBHostMSD/USBHostMSD.h
index f61c6f3..3ec3180 100644
--- a/src/USBHostMSD/USBHostMSD.h
+++ b/src/USBHostMSD/USBHostMSD.h
@@ -65,7 +65,7 @@ class USBHostMSD : public IUSBEnumerator, public mbed::BlockDevice
     virtual mbed::bd_size_t size() const;
     virtual const char *get_type() const;
     bool attach_detected_callback(void (*cbk)());
-
+    bool attach_removed_callback(void (*cbk)());
 
 protected:
     //From IUSBEnumerator

From f8b3422122bc2d13f88ab344e6dc3abc02e054f3 Mon Sep 17 00:00:00 2001
From: Alrik Vidstrom <a.vidstrom@arduino.cc>
Date: Wed, 20 Sep 2023 18:34:50 +0200
Subject: [PATCH 2/2] Add comment

---
 src/USBHost/USBHost.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/USBHost/USBHost.cpp b/src/USBHost/USBHost.cpp
index 7558909..77ff9e0 100644
--- a/src/USBHost/USBHost.cpp
+++ b/src/USBHost/USBHost.cpp
@@ -257,6 +257,7 @@ void USBHost::usb_process()
 
                     } while(0);
 
+                    // Call the device disconnected callback if registered
                     if (nullptr != unmount_fnc) {
                         unmount_fnc();
                     }