From 0b22795e26ee09de14f6ac23219adeda12f2fd5b Mon Sep 17 00:00:00 2001
From: Jonathan Gordon <rockbox@jdgordon.info>
Date: Mon, 6 Nov 2006 14:24:18 +0000
Subject: adds ata_idle_notify system which allows callbacks in apps/ to be
 called when the hard disk is idle but spinning, and just before shutting
 down. on SWCODEC targets with > 8MB RAM the playback engine will try to
 refill the buffer if it is less than 75% full while the disk is spinning
 (temporarily disabled on the nano)

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@11451 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/SOURCES                  |  1 +
 firmware/ata_idle_notify.c        | 96 +++++++++++++++++++++++++++++++++++++++
 firmware/drivers/ata.c            | 15 ++++--
 firmware/export/ata_idle_notify.h | 41 +++++++++++++++++
 4 files changed, 150 insertions(+), 3 deletions(-)
 create mode 100644 firmware/ata_idle_notify.c
 create mode 100644 firmware/export/ata_idle_notify.h

(limited to 'firmware')

diff --git a/firmware/SOURCES b/firmware/SOURCES
index e9ce8f909b..1ec3c82616 100644
--- a/firmware/SOURCES
+++ b/firmware/SOURCES
@@ -95,6 +95,7 @@ drivers/lcd-h300.c
 drivers/power.c
 #endif
 drivers/led.c
+ata_idle_notify.c
 #ifndef SIMULATOR
 #ifndef TARGET_TREE
 drivers/adc.c
diff --git a/firmware/ata_idle_notify.c b/firmware/ata_idle_notify.c
new file mode 100644
index 0000000000..a0a56e958b
--- /dev/null
+++ b/firmware/ata_idle_notify.c
@@ -0,0 +1,96 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2006 Jonathan Gordon
+ *
+ * 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 <stdbool.h>
+#include "system.h"
+#include "ata_idle_notify.h"
+#include "logf.h"
+
+#if USING_ATA_CALLBACK
+static ata_idle_notify ata_idle_notify_funcs[MAX_ATA_CALLBACKS];
+static int ata_callback_count = 0;
+#endif
+
+bool register_ata_idle_func(ata_idle_notify function)
+{
+#if USING_ATA_CALLBACK
+    int i;
+    for (i=0; i<MAX_ATA_CALLBACKS; i++)
+    {
+        if (ata_idle_notify_funcs[i] == NULL)
+        {
+            ata_idle_notify_funcs[i] = function;
+            ata_callback_count++;
+            return true;
+        }
+        else if (ata_idle_notify_funcs[i] == function)
+            return true;
+    }
+    return false;
+#else
+    function(); /* just call the function now */
+/* this _may_ cause problems later if the calling function
+   sets a variable expecting the callback to unset it, because
+   the callback will be run before this function exits, so before the var is set */
+    return true;
+#endif
+}
+
+#if USING_ATA_CALLBACK
+void unregister_ata_idle_func(ata_idle_notify func)
+{
+    int i;
+    for (i=0; i<MAX_ATA_CALLBACKS; i++)
+    {
+        if (ata_idle_notify_funcs[i] == func)
+        {
+            ata_idle_notify_funcs[i] = NULL;
+            ata_callback_count--;
+        }
+    }
+    return;
+}
+
+bool call_ata_idle_notifys(void)
+{
+    int i;
+    ata_idle_notify function;
+    if (ata_callback_count == 0)
+        return false;
+    ata_callback_count = 0; /* so we dont re-enter every time the callbacks read/write */
+    for (i = 0; i < MAX_ATA_CALLBACKS; i++)
+    {
+        if (ata_idle_notify_funcs[i])
+        {
+            function = ata_idle_notify_funcs[i];
+            ata_idle_notify_funcs[i] = NULL;
+            function();
+        }
+    }
+    return true;
+}
+
+void ata_idle_notify_init(void)
+{
+    int i;
+    for (i=0; i<MAX_ATA_CALLBACKS; i++)
+    {
+        ata_idle_notify_funcs[i] = NULL;
+    }
+}
+#endif
diff --git a/firmware/drivers/ata.c b/firmware/drivers/ata.c
index 00ef0e8eb5..249cb3934e 100644
--- a/firmware/drivers/ata.c
+++ b/firmware/drivers/ata.c
@@ -29,7 +29,7 @@
 #include "power.h"
 #include "string.h"
 #include "hwcompat.h"
-
+#include "ata_idle_notify.h"
 #ifdef TARGET_TREE
 #include "ata-target.h"
 #endif
@@ -1364,6 +1364,7 @@ static void ata_thread(void)
 {
     static long last_sleep = 0;
     struct event ev;
+    static long last_callback_run = 0;
     
     while (1) {
         while ( queue_empty( &ata_queue ) ) {
@@ -1373,8 +1374,16 @@ static void ata_thread(void)
                  TIME_AFTER( current_tick, 
                              last_disk_activity + sleep_timeout ) )
             {
-                ata_perform_sleep();
-                last_sleep = current_tick;
+                if (!call_ata_idle_notifys())
+                {
+                    ata_perform_sleep();
+                    last_sleep = current_tick;
+                }
+            }
+            else if (TIME_AFTER(current_tick, last_callback_run+(HZ*5)))
+            {
+                last_callback_run = current_tick;
+                call_ata_idle_notifys();
             }
 
 #ifdef HAVE_ATA_POWER_OFF
diff --git a/firmware/export/ata_idle_notify.h b/firmware/export/ata_idle_notify.h
new file mode 100644
index 0000000000..f5f2a25fd9
--- /dev/null
+++ b/firmware/export/ata_idle_notify.h
@@ -0,0 +1,41 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2006 Jonathan Gordon
+ *
+ * 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 __ATACALLBACK_H__
+#define __ATACALLBACK_H__
+
+#include <stdbool.h>
+#define USING_ATA_CALLBACK  !defined(SIMULATOR)             \
+                            && !defined(HAVE_FLASH_DISK)    \
+                            && !defined(HAVE_MMC)
+                            
+#define MAX_ATA_CALLBACKS 5
+typedef bool (*ata_idle_notify)(void);
+
+extern bool register_ata_idle_func(ata_idle_notify function);
+#if USING_ATA_CALLBACK
+extern void ata_idle_notify_init(void);
+extern void unregister_ata_idle_func(ata_idle_notify function);
+extern bool call_ata_idle_notifys(void);
+#else
+#define unregister_ata_idle_func(f)
+#define call_ata_idle_notifys()
+#define ata_idle_notify_init()
+#endif
+
+#endif /* __ATACALLBACK_H__ */
-- 
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