Index: firmware/target/arm/ipod/power-ipod.c
===================================================================
--- firmware/target/arm/ipod/power-ipod.c	(revision 20042)
+++ firmware/target/arm/ipod/power-ipod.c	(working copy)
@@ -150,3 +150,79 @@
 #endif
 #endif
 }
+
+#ifdef HAVE_USB_CHARGING_ENABLE
+/* This patch is EXPERIMENTAL and UNTESTED */
+bool usb_charging_enable(bool on)
+{
+    /* The bits should probably be set up for output.
+       These setups have probably already been done 
+     */
+#if 0
+#if defined(IPOD_VIDEO) || defined(IPOD_NANO)
+    GPIOL_ENABLE |= 4;
+    GPIOL_OUTPUT_EN |= 4;
+    GPIOA_ENABLE |= 4;
+    GPIOA_OUTPUT_EN |= 4;
+#if defined(IPOD_VIDEO)
+    GPO32_ENABLE |= 0x10000000;
+#endif
+#else /* !defined(IPOD_VIDEO) && !defined(IPOD_NANO) */
+#if defined(IPOD_MINI2G)
+    GPIOJ_ENABLE |= 2;
+    GPIOJ_OUTPUT_EN |= 2;
+#else
+    GPO32_ENABLE |= 0x8000000;
+#endif
+    GPO32_ENABLE |= 0x40;
+#if defined(IPOD_4G) || defined(IPOD_COLOR)
+    GPO32_ENABLE |= 0x200;
+#endif
+#endif /* !defined(IPOD_VIDEO) && !defined(IPOD_NANO) */
+#endif /* 0 */
+
+    /* This should be 0 when others are 1.
+       Setting others to 0 and this to 1 is a valid but unknown state.
+     */
+#if defined(IPOD_VIDEO) || defined(IPOD_NANO)
+    GPIOL_OUTPUT_VAL &= ~4;
+#elif defined(IPOD_MINI2G)
+    GPIOJ_OUTPUT_VAL &= ~2;
+#else
+    GPO32_VAL &= ~0x8000000;
+#endif
+
+    /* This should enable USB charging */
+#if defined(IPOD_VIDEO) || defined(IPOD_NANO)
+    if (on)
+        GPIOA_OUTPUT_VAL |= 4;
+    else
+        GPIOA_OUTPUT_VAL &= ~4;
+#else
+    if (on)
+        GPO32_VAL |= 0x40;
+    else 
+        GPO32_VAL &= ~0x40;
+#endif
+
+    /* This bit may be set when USB charging is enabled.
+       It probably increases the USB current limit.
+       FIXME: This should probably only be done if you think the source
+              can supply 500 mA.
+     */
+#if defined(IPOD_VIDEO)
+    if (on)
+        GPO32_VAL |= 0x10000000;
+    else 
+        GPO32_VAL &= ~0x10000000;
+#elif defined(IPOD_4G) || defined(IPOD_COLOR)
+    if (on)
+        GPO32_VAL |= 0x200;
+    else 
+        GPO32_VAL &= ~0x200;
+#endif
+    /* This might be GPIOD & 40 on 2G */
+
+    return on;
+}
+#endif /* HAVE_USB_CHARGING_ENABLE */