Fix IPod 3G USB Recognition Problem

Allow IPod 3rd generation to recognize when USB is connected and reboot into disk mode.
This problem is listed at the bottom of the Ipod status page https://www.rockbox.org/wiki/IpodStatus

Change-Id: I8f32afd065d3a91cddc56fe63454bd082bfa29b9

1 files changed, 11 insertions, 5 deletions

diff --git a/firmware/target/arm/pp/usb-fw-pp5002.c b/firmware/target/arm/pp/usb-fw-pp5002.c
index d296b05b2f..d0fbbd6e48 100644
--- a/firmware/target/arm/pp/usb-fw-pp5002.c
+++ b/firmware/target/arm/pp/usb-fw-pp5002.c
@@ -28,12 +28,14 @@
 
 void usb_pin_init(void)
 {
-    /* TODO: add USB init for iPod 3rd gen */
-
-#if defined(IPOD_1G2G) || defined(IPOD_3G)
+#if defined(IPOD_1G2G)
     /* GPIO C bit 7 is firewire detect */
     GPIOC_ENABLE    |=  0x80;
     GPIOC_OUTPUT_EN &= ~0x80;
+#elif defined(IPOD_3G)
+    /* GPIO D bit 4 is USB detect */
+    GPIOD_ENABLE    |=  0x10;
+    GPIOD_OUTPUT_EN &= ~0x10;
 #endif
 }
 
@@ -62,13 +64,17 @@ void usb_enable(bool on)
 
 int usb_detect(void)
 {
-#if defined(IPOD_1G2G) || defined(IPOD_3G)
+#if defined(IPOD_1G2G)
     /* GPIO C bit 7 is firewire detect */
     if (!(GPIOC_INPUT_VAL & 0x80))
         return USB_INSERTED;
 #endif
 
-    /* TODO: add USB detection for iPod 3rd gen */
+#if defined(IPOD_3G)
+    /* GPIO D bit 4 is USB detect */
+    if (GPIOD_INPUT_VAL & 0x10)
+        return USB_INSERTED;
+#endif
 
     return USB_EXTRACTED;
 }