USB charging support for iPods.

This adds proper full speed charging support for iPod 4G, Color, Mini 1G, Mini 2G, Nano 1G, and Video. Nano 2G already has support, so now all ipods charge (except 1G-3G whose hardware doesn't support USB charging).

USB charging defaults to on, but will only charge at full speed from a USB host. To charge from an AC charger, you need to set the USB charging mode to "force". It may be possible to detect AC chargers in a future version, at least on some models.


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@26626 a1c6a512-1295-4272-9138-f99709370657

firmware/export/config/ipod4g.h

@@ -146,6 +146,10 @@
 /* define this if the unit can be powered or charged via USB */
 #define HAVE_USB_POWER
 
+/* define this if the unit can have USB charging disabled by user -
+ * if USB/MAIN power is discernable and hardware doesn't compel charging */
+#define HAVE_USB_CHARGING_ENABLE
+
 /* define current usage levels */
 #define CURRENT_NORMAL     100  /* MP3: ~10.5h out of 1100mAh battery  */
 #define CURRENT_BACKLIGHT  20  /* FIXME: this needs adjusting */

firmware/export/config/ipodcolor.h

@@ -130,6 +130,10 @@
 /* define this if the unit can be powered or charged via USB */
 #define HAVE_USB_POWER
 
+/* define this if the unit can have USB charging disabled by user -
+ * if USB/MAIN power is discernable and hardware doesn't compel charging */
+#define HAVE_USB_CHARGING_ENABLE
+
 /* define current usage levels */
 #define CURRENT_NORMAL     69  /* ~10h (700mAh), see FS#9072 */
 #define CURRENT_BACKLIGHT  20  /* FIXME: this needs adjusting */

firmware/export/config/ipodmini1g.h

@@ -143,6 +143,11 @@
 /* define this if the unit can be powered or charged via USB */
 #define HAVE_USB_POWER
 
+/* define this if the unit can have USB charging disabled by user -
+:Qa
+ * if USB/MAIN power is discernable and hardware doesn't compel charging */
+#define HAVE_USB_CHARGING_ENABLE
+
 /* Define this if you have a PortalPlayer PP5020 */
 #define CONFIG_CPU PP5020
 

firmware/export/config/ipodmini2g.h

@@ -150,6 +150,10 @@
 /* define this if the unit can be powered or charged via USB */
 #define HAVE_USB_POWER
 
+/* define this if the unit can have USB charging disabled by user -
+ * if USB/MAIN power is discernable and hardware doesn't compel charging */
+#define HAVE_USB_CHARGING_ENABLE
+
 /* Define this if you have a PortalPlayer PP5022 */
 #define CONFIG_CPU PP5022
 

firmware/export/config/ipodnano1g.h

@@ -131,6 +131,10 @@
 /* define this if the unit can be powered or charged via USB */
 #define HAVE_USB_POWER
 
+/* define this if the unit can have USB charging disabled by user -
+ * if USB/MAIN power is discernable and hardware doesn't compel charging */
+#define HAVE_USB_CHARGING_ENABLE
+
 #define CURRENT_NORMAL     32  /* MP3: ~9h playback out of 300mAh battery */
 #define CURRENT_BACKLIGHT  20  /* FIXME: this needs adjusting */
 #if defined(HAVE_RECORDING)

firmware/export/config/ipodvideo.h

@@ -154,6 +154,10 @@
 /* define this if the unit can be powered or charged via USB */
 #define HAVE_USB_POWER
 
+/* define this if the unit can have USB charging disabled by user -
+ * if USB/MAIN power is discernable and hardware doesn't compel charging */
+#define HAVE_USB_CHARGING_ENABLE
+
 /* define current usage levels */
 #define CURRENT_NORMAL     24  /* 30MHz clock, LCD off, accessory supply on */
 #define CURRENT_BACKLIGHT  20  /* FIXME: this needs adjusting */

firmware/target/arm/ipod/power-ipod.c

@@ -182,3 +182,65 @@ void power_off(void)
 #endif
 #endif
 }
+
+#ifdef HAVE_USB_CHARGING_ENABLE
+void usb_charging_maxcurrent_change(int maxcurrent)
+{
+    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 */
+#if defined(IPOD_VIDEO) || defined(IPOD_NANO)
+    if (suspend_charging)
+        GPIOL_OUTPUT_VAL |= 4;
+    else
+        GPIOL_OUTPUT_VAL &= ~4;
+#elif defined(IPOD_MINI2G)
+    if (suspend_charging)
+        GPIOJ_OUTPUT_VAL |= 2;
+    else
+        GPIOJ_OUTPUT_VAL &= ~2;
+#else
+    if (suspend_charging)
+        GPO32_VAL |= 0x8000000;
+    else
+        GPO32_VAL &= ~0x8000000;
+#endif
+
+    /* This GPIO is connected to the LTC4066's HPWR pin */
+    /* Setting it low limits current to 100mA, setting it high allows 500mA */
+#if defined(IPOD_VIDEO) || defined(IPOD_NANO)
+    if (fast_charging)
+        GPIOA_OUTPUT_VAL |= 4;
+    else
+        GPIOA_OUTPUT_VAL &= ~4;
+#else
+    if (fast_charging)
+        GPO32_VAL |= 0x40;
+    else 
+        GPO32_VAL &= ~0x40;
+#endif
+
+    /* This GPIO is connected to the LTC4066's CLDIS pin */
+    /* Setting it high allows up to 1.5A of current to be drawn */
+    /* This doesn't appear to actually be safe even with an AC charger */
+    /* so for now it is disabled. It's not known (or maybe doesn't exist) */
+    /* on all models. */
+#if 0
+#if defined(IPOD_VIDEO)
+    if (unlimited_charging)
+        GPO32_VAL |= 0x10000000;
+    else 
+        GPO32_VAL &= ~0x10000000;
+#elif defined(IPOD_4G) || defined(IPOD_COLOR)
+    if (unlimited_charging)
+        GPO32_VAL |= 0x200;
+    else 
+        GPO32_VAL &= ~0x200;
+#endif
+    /* This might be GPIOD & 40 on 2G */
+#endif
+}
+#endif /* HAVE_USB_CHARGING_ENABLE */