From dc7534bdb2a784ae9d5c9089237935ff405c3525 Mon Sep 17 00:00:00 2001
From: Jörg Hohensohn <hohensoh@rockbox.org>
Date: Fri, 28 Jan 2005 21:32:16 +0000
Subject: preparations for hotswapping MMC

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@5701 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/common/disk.c | 97 ++++++++++++++++++++++++++++++++++++--------------
 1 file changed, 70 insertions(+), 27 deletions(-)

(limited to 'firmware/common/disk.c')

diff --git a/firmware/common/disk.c b/firmware/common/disk.c
index 923dffbe46..fd6de55ddb 100644
--- a/firmware/common/disk.c
+++ b/firmware/common/disk.c
@@ -23,6 +23,8 @@
 #ifdef HAVE_MMC
 #include "ata_mmc.h"
 #endif
+#include "file.h" /* for release_dirs() */
+#include "dir.h" /* for release_files() */
 #include "disk.h"
 
 /* Partition table entry layout:
@@ -44,6 +46,7 @@
      ((long)array[pos+2] << 16 ) | ((long)array[pos+3] << 24 ))
 
 static struct partinfo part[8]; /* space for 4 partitions on 2 drives */
+static int vol_drive[NUM_VOLUMES]; /* mounted to which drive (-1 if none) */
 
 struct partinfo* disk_init(IF_MV_NONVOID(int drive))
 {
@@ -95,46 +98,86 @@ struct partinfo* disk_partinfo(int partition)
 
 int disk_mount_all(void)
 {
-    struct partinfo* pinfo;
-    int i,j;
-    int mounted = 0;
-    bool found;
-    int drives = 1;
+    int mounted;
+    int i;
+
+    fat_init(); /* reset all mounted partitions */
+    for (i=0; i<NUM_VOLUMES; i++)
+        vol_drive[i] = -1; /* mark all as unassigned */
+
+    mounted = disk_mount(0);
 #ifdef HAVE_MMC
     if (mmc_detect()) /* for Ondio, only if card detected */
     {
-        drives = 2; /* in such case we have two drives to try */
+        mounted += disk_mount(1); /* try 2nd "drive", too */
     }
 #endif
 
-    fat_init(); /* reset all mounted partitions */
-    for (j=0; j<drives; j++)
+    return mounted;
+}
+
+static int get_free_volume(void)
+{
+    int i;
+    for (i=0; i<NUM_VOLUMES; i++)
+    {
+        if (vol_drive[i] == -1) /* unassigned? */
+            return i;
+    }
+
+    return -1; /* none found */
+}
+
+int disk_mount(int drive)
+{
+    int i;
+    int mounted = 0; /* reset partition-on-drive flag */
+    int volume = get_free_volume();
+    struct partinfo* pinfo = disk_init(IF_MV(drive));
+
+    if (pinfo == NULL)
+    {
+        return 0;
+    }
+    for (i=0; volume != -1 && i<4; i++)
     {
-        found = false; /* reset partition-on-drive flag */
-        pinfo = disk_init(IF_MV(j));
-        if (pinfo == NULL)
+        if (!fat_mount(IF_MV2(volume,) IF_MV2(drive,) pinfo[i].start))
         {
-            continue;
+            mounted++;
+            vol_drive[volume] = drive; /* remember the drive for this volume */
+            volume = get_free_volume(); /* prepare next entry */
         }
-        for (i=0; mounted<NUM_VOLUMES && i<4; i++)
+    }
+
+    if (mounted == 0 && volume != -1) /* none of the 4 entries worked? */
+    {   /* try "superfloppy" mode */
+        DEBUGF("No partition found, trying to mount sector 0.\n");
+        if (!fat_mount(IF_MV2(volume,) IF_MV2(drive,) 0))
         {
-            if (!fat_mount(IF_MV2(mounted,) IF_MV2(j,) pinfo[i].start))
-            {
-                mounted++;
-                found = true; /* at least one valid entry */
-            }
+            mounted = 1;
+            vol_drive[volume] = drive; /* remember the drive for this volume */
         }
+    }
+    return mounted;
+}
 
-        if (!found && mounted<NUM_VOLUMES) /* none of the 4 entries worked? */
-        {   /* try "superfloppy" mode */
-            DEBUGF("No partition found, trying to mount sector 0.\n");
-            if (!fat_mount(IF_MV2(mounted,) IF_MV2(j,) 0))
-            {
-                mounted++;
-            }
+#ifdef HAVE_HOTSWAP
+int disk_unmount(int drive)
+{
+    int unmounted = 0;
+    int i;
+    for (i=0; i<NUM_VOLUMES; i++)
+    {
+        if (vol_drive[i] == drive)
+        {   /* force releasing resources */
+            vol_drive[i] = -1; /* mark unused */
+            unmounted++;
+            release_files(i);
+            release_dirs(i);
+            fat_unmount(i, false);
         }
     }
 
-    return mounted;
+    return unmounted;
 }
-
+#endif /* #ifdef HAVE_HOTSWAP */
-- 
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