From 65c42d56ac58e19f41bc575efd5180eab82110f0 Mon Sep 17 00:00:00 2001
From: Linus Nielsen Feltzing <linus@haxx.se>
Date: Sat, 29 Jun 2002 22:41:39 +0000
Subject: First version

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@1257 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/usb.c | 125 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 firmware/usb.h |  25 ++++++++++++
 2 files changed, 150 insertions(+)
 create mode 100644 firmware/usb.c
 create mode 100644 firmware/usb.h

diff --git a/firmware/usb.c b/firmware/usb.c
new file mode 100644
index 0000000000..a9df5ee57a
--- /dev/null
+++ b/firmware/usb.c
@@ -0,0 +1,125 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2002 by Linus Nielsen Feltzing
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#include "config.h"
+#include "sh7034.h"
+#include "kernel.h"
+#include "thread.h"
+#include "system.h"
+#include "debug.h"
+
+#ifndef SIMULATOR
+
+#define USB_INSERTED    1
+#define USB_EXTRACTED   2
+
+static char usb_stack[0x100];
+static struct event_queue usb_queue;
+static bool usb_connected;
+
+static void usb_thread(void)
+{
+    int num_acks_to_expect = -1;
+    bool waiting_for_ack;
+    struct event ev;
+
+    waiting_for_ack = false;
+    
+    while(1)
+    {
+	queue_wait(&usb_queue, &ev);
+	switch(ev.id)
+	{
+	case USB_INSERTED:
+	    /* Tell all threads that they have to back off the ATA.
+	       We subtract one for our own thread. */
+	    num_acks_to_expect = queue_broadcast(SYS_USB_CONNECTED, NULL) - 1;
+	    waiting_for_ack = true;
+	    DEBUGF("USB inserted. Waiting for ack from %d threads...\n");
+	    break;
+	    
+	case SYS_USB_CONNECTED_ACK:
+	    if(waiting_for_ack)
+	    {
+		num_acks_to_expect--;
+		if(num_acks_to_expect == 0)
+		{
+		    /* This is where we are supposed to be cool and keep
+		       the Rockbox firmware running while the USB is enabled,
+		       maybe even play some games and stuff. However, the
+		       current firmware isn't quite ready for this yet.
+		       Let's just chicken out and reboot. */
+		    DEBUGF("All threads have acknowledged. Rebooting...\n");
+		    system_reboot();
+		}
+		else
+		{
+		    DEBUGF("usb: got ack, %d to go...\n", num_acks_to_expect);
+		}
+	    }
+	}
+    }
+}
+
+static void usb_tick(void)
+{
+    int current_status;
+
+#ifdef ARCHOS_RECORDER
+    current_status = PCDR & 0x04;
+#else
+    current_status = PADR & 0x8000;
+#endif
+
+    if(current_status && !usb_connected)
+    {
+	usb_connected = true;
+	queue_post(&usb_queue, USB_INSERTED, NULL);
+    }
+}
+
+void usb_acknowledge(int id)
+{
+   queue_post(&usb_queue, id, NULL);
+}
+
+void usb_init(void)
+{
+    int rc;
+    
+    usb_connected = false;
+    
+    queue_init(&usb_queue);
+    create_thread(usb_thread, usb_stack, sizeof(usb_stack));
+
+    rc = tick_add_task(usb_tick);
+}
+
+#else
+
+/* Dummy simulator functions */
+void usb_acknowledge(int id)
+{
+    id = id;
+}
+
+void usb_init(void)
+{
+}
+
+#endif
diff --git a/firmware/usb.h b/firmware/usb.h
new file mode 100644
index 0000000000..de13f829c1
--- /dev/null
+++ b/firmware/usb.h
@@ -0,0 +1,25 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2002 by Linus Nielsen Feltzing
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#ifndef _USB_H_
+#define _USB_H_
+
+void usb_init(void);
+void usb_acknowledge(int id);
+
+#endif
-- 
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