sonynwz: Properly support multidrive, with hotswap of the SD card

Change-Id: I7eb8efb0986a395d5ffbcc06a54bb680e0b59e9d

firmware/export/config/samsungypr0.h

@@ -169,3 +169,4 @@
 #define HAVE_HOTSWAP
 #define HAVE_STORAGE_FLUSH
 #define MULTIDRIVE_DIR "/mnt/mmc"
+#define MULTIDRIVE_DEV "/sys/block/mmcblk0"

firmware/export/config/sonynwa20.h

@@ -13,4 +13,6 @@
 /* sqrt(240^2 + 320^2) / 2 = 200 */
 #define LCD_DPI 200
 
+#define NWZ_HAS_SD
+
 #include "sonynwzlinux.h"

firmware/export/config/sonynwza10.h

@@ -13,4 +13,6 @@
 /* sqrt(240^2 + 320^2) / 2 = 200 */
 #define LCD_DPI 200
 
+#define NWZ_HAS_SD
+
 #include "sonynwzlinux.h"

firmware/export/config/sonynwzlinux.h

@@ -57,9 +57,6 @@
 /* The number of bytes reserved for loadable plugins */
 #define PLUGIN_BUFFER_SIZE 0x100000
 
-
-
-
 #define CONFIG_TUNER SI4700
 
 /* There is no hardware tone control */
@@ -105,8 +102,18 @@
 /* Define this to the CPU frequency */
 #define CPU_FREQ            532000000
 
+#ifdef NWZ_HAS_SD
+/* External SD card can be mounted */
+#define CONFIG_STORAGE (STORAGE_HOSTFS|STORAGE_SD)
+#define HAVE_MULTIDRIVE  /* But _not_ CONFIG_STORAGE_MULTI */
+#define NUM_DRIVES 2
+#define HAVE_HOTSWAP
+#define MULTIDRIVE_DIR "/mnt/media"
+#define MULTIDRIVE_DEV "/sys/block/mmcblk1"
+#else
 /* No special storage */
 #define CONFIG_STORAGE STORAGE_HOSTFS
+#endif
 #define HAVE_STORAGE_FLUSH
 
 /* Battery */

firmware/target/hosted/sonynwz/system-nwz.c

@@ -23,20 +23,24 @@
 #include <signal.h>
 #include <ucontext.h>
 #include <string.h>
+#include <stdio.h>
+
 #include "system.h"
 #include "lcd.h"
 #include "font.h"
-#include "logf.h"
 #include "system.h"
 #include "backlight-target.h"
 #include "button.h"
 #include "adc.h"
 #include "power.h"
+#include "mv.h"
 #include "power-nwz.h"
 #include <backtrace.h>
-#include <stdio.h>
+
+#include "logf.h"
 
 static const char **kern_mod_list;
+bool os_file_exists(const char *ospath);
 
 void power_off(void)
 {
@@ -238,3 +242,57 @@ bool nwz_is_kernel_module_loaded(const char *name)
             return true;
     return false;
 }
+
+#ifdef CONFIG_STORAGE_MULTI
+int hostfs_driver_type(int drive)
+{
+    return drive > 0 ? STORAGE_SD_NUM : STORAGE_HOSTFS_NUM;
+}
+#endif /* CONFIG_STORAGE_MULTI */
+
+#ifdef HAVE_HOTSWAP
+bool hostfs_removable(IF_MD_NONVOID(int volume))
+{
+#ifdef HAVE_MULTIDRIVE
+    if (volume > 0)
+        return true;
+    else
+#endif
+        return false; /* internal: always present */
+}
+
+bool hostfs_present(int volume)
+{
+#ifdef HAVE_MULTIDRIVE
+    if (volume > 0)
+#if defined(MULTIDRIVE_DEV)
+        return os_file_exists(MULTIDRIVE_DEV);
+#else
+        return true; // FIXME?
+#endif
+    else
+#endif
+        return true; /* internal: always present */
+}
+#endif /* HAVE_HOTSWAP */
+
+#ifdef HAVE_MULTIDRIVE
+int volume_drive(int drive)
+{
+    return drive;
+}
+#endif /* HAVE_MULTIDRIVE */
+
+#ifdef HAVE_HOTSWAP
+bool volume_removable(IF_MV_NONVOID(int volume))
+{
+    /* don't support more than one partition yet, so volume == drive */
+    return hostfs_removable(volume);
+}
+
+bool volume_present(int volume)
+{
+    /* don't support more than one partition yet, so volume == drive */
+    return hostfs_present(volume);
+}
+#endif /* HAVE_HOTSWAP */