From 3f709eada2d67418971ec1c5d907a06ba9161200 Mon Sep 17 00:00:00 2001
From: Michael Sevakis <jethead71@rockbox.org>
Date: Sat, 29 Jan 2011 00:44:59 +0000
Subject: Convert AMS target USB detection to event-based (no more polling in a
 tick). Seems well on my Clip v1 and Fuze v2.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@29156 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/export/config.h                | 14 +++---
 firmware/target/arm/as3525/usb-as3525.c | 79 +++++++++++++++++++++++----------
 2 files changed, 64 insertions(+), 29 deletions(-)

diff --git a/firmware/export/config.h b/firmware/export/config.h
index f5ee003308..d59b259fb9 100644
--- a/firmware/export/config.h
+++ b/firmware/export/config.h
@@ -721,15 +721,19 @@ Lyre prototype 1 */
 
 #define HAVE_SEMAPHORE_OBJECTS
 
-#if defined(HAVE_USBSTACK) && CONFIG_USBOTG == USBOTG_ARC
+#ifdef HAVE_USBSTACK
+#if CONFIG_USBOTG == USBOTG_ARC
 #define USB_STATUS_BY_EVENT
 #define USB_DETECT_BY_DRV
 #define INCLUDE_TIMEOUT_API
-#endif /* HAVE_USBSTACK && USBOTG_ARC */
-
-#if defined(HAVE_USBSTACK) && CONFIG_USBOTG == USBOTG_AS3525
+#elif CONFIG_USBOTG == USBOTG_AS3525
+#define USB_STATUS_BY_EVENT
 #define USB_DETECT_BY_DRV
-#endif /* HAVE_USBSTACK && USBOTG_AS3525 */
+#elif CONFIG_USBOTG == USBOTG_AS3525v2
+#define USB_STATUS_BY_EVENT
+#define USB_DETECT_BY_CORE
+#endif /* CONFIG_USB == */
+#endif /* HAVE_USBSTACK */
 
 #endif /* BOOTLOADER */
 
diff --git a/firmware/target/arm/as3525/usb-as3525.c b/firmware/target/arm/as3525/usb-as3525.c
index 5664eb2096..a6d5d3a245 100644
--- a/firmware/target/arm/as3525/usb-as3525.c
+++ b/firmware/target/arm/as3525/usb-as3525.c
@@ -18,9 +18,8 @@
  * KIND, either express or implied.
  *
  ****************************************************************************/
-
-#include <stdbool.h>
 #include "config.h"
+#include "system.h"
 #include "usb.h"
 #ifdef HAVE_USBSTACK
 #include "usb_core.h"
@@ -29,8 +28,40 @@
 #include "power.h"
 #include "as3525.h"
 
-static bool bus_activity = 0;
-static bool connected = 0;
+static int usb_status = USB_EXTRACTED;
+
+#if CONFIG_CPU == AS3525v2 && !defined(USE_ROCKBOX_USB)
+/* Rebooting on USB plug can crash these players in a state where
+ * hardware power off (pressing the power button) doesn't work anymore
+ * TODO: Implement USB in rockbox for these players */
+#define USB_INSERT_INT_STATUS   USB_EXTRACTED
+#undef USB_DETECT_BY_DRV
+#undef USB_DETECT_BY_CORE
+#undef USB_STATUS_BY_EVENT
+
+#else /* !AS3525v2 */
+
+#if defined(USB_DETECT_BY_DRV) || defined(USB_DETECT_BY_CORE)
+
+#ifdef USB_STATUS_BY_EVENT
+#define USB_INSERT_INT_STATUS   USB_INSERTED
+#define USB_INSERT_INT_EVENT    USB_POWERED
+#define USB_REMOVE_INT_EVENT    USB_UNPOWERED
+#else
+#define USB_INSERT_INT_STATUS   USB_POWERED
+#endif /* USB_STATUS_BY_EVENT */
+
+#else /* !USB_DETECT_BY_* */
+
+#define USB_INSERT_INT_STATUS   USB_INSERTED
+#ifdef USB_STATUS_BY_EVENT
+#define USB_INSERT_INT_EVENT    USB_INSERTED
+#define USB_REMOVE_INT_EVENT    USB_EXTRACTED
+#endif /* USB_STATUS_BY_EVENT */
+
+#endif /* USB_DETECT_BY_* */
+
+#endif /* AS3525v2 */
 
 void usb_enable(bool on)
 {
@@ -46,36 +77,36 @@ void usb_enable(bool on)
 
 void usb_insert_int(void)
 {
-    connected = 1;
+    usb_status = USB_INSERT_INT_STATUS;
+#ifdef USB_STATUS_BY_EVENT
+    usb_status_event(USB_INSERT_INT_EVENT);
+#endif
 }
 
 void usb_remove_int(void)
 {
-    connected = 0;
-    bus_activity = 0;
+    usb_status = USB_EXTRACTED;
+#ifdef USB_STATUS_BY_EVENT
+    usb_status_event(USB_REMOVE_INT_EVENT);
+#endif
 }
 
 void usb_drv_usb_detect_event(void)
 {
-    /* Bus activity seen */
-    bus_activity = 1;
+#if defined(USB_DETECT_BY_DRV) || defined(USB_DETECT_BY_CORE)
+    int oldstatus = disable_irq_save(); /* May come via USB thread */
+    if (usb_status == USB_INSERT_INT_STATUS)
+    {
+        usb_status = USB_INSERTED;
+#ifdef USB_STATUS_BY_EVENT
+        usb_status_event(USB_INSERTED);
+#endif
+    }
+    restore_irq(oldstatus);
+#endif /* USB_DETECT_BY_* */
 }
 
 int usb_detect(void)
 {
-#if CONFIG_CPU == AS3525v2 && !defined(USE_ROCKBOX_USB)
-    /* Rebooting on USB plug can crash these players in a state where
-     * hardware power off (pressing the power button) doesn't work anymore
-     * TODO: Implement USB in rockbox for these players */
-    return USB_EXTRACTED;
-#elif defined(USB_DETECT_BY_DRV)
-    if(bus_activity && connected)
-        return USB_INSERTED;
-    else if(connected)
-        return USB_POWERED;
-    else
-        return USB_UNPOWERED;
-#else
-    return connected?USB_INSERTED:USB_EXTRACTED;
-#endif
+    return usb_status;
 }
-- 
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