iPod Classic/6G: support USB suspend mode

Actually Rockbox does not use this mode, it is supported by
other iPods, so implemented on Classic as well.

Change-Id: Ia6578506df27a95a7f7522b3034b764631a8bb3a

1 files changed, 11 insertions, 2 deletions

diff --git a/firmware/target/arm/s5l8702/ipod6g/power-ipod6g.c b/firmware/target/arm/s5l8702/ipod6g/power-ipod6g.c
index 12948f581d..2e0fe87883 100644
--- a/firmware/target/arm/s5l8702/ipod6g/power-ipod6g.c
+++ b/firmware/target/arm/s5l8702/ipod6g/power-ipod6g.c
@@ -61,8 +61,17 @@ bool ide_powered()
 #ifdef HAVE_USB_CHARGING_ENABLE
 void usb_charging_maxcurrent_change(int maxcurrent)
 {
-    bool on = (maxcurrent >= 500);
-    GPIOCMD = 0xb060e | (on ? 1 : 0);
+    bool suspend_charging = (maxcurrent < 100);
+    bool fast_charging = (maxcurrent >= 500);
+
+    /* This GPIO is connected to the LTC4066's SUSP pin */
+    /* Setting it high prevents any power being drawn over USB */
+    /* which supports USB suspend */
+    GPIOCMD = 0xb070e | (suspend_charging ? 1 : 0);
+
+    /* This GPIO is connected to the LTC4066's HPWR pin */
+    /* Setting it low limits current to 100mA, setting it high allows 500mA */
+    GPIOCMD = 0xb060e | (fast_charging ? 1 : 0);
 }
 #endif