New USB charging system, part 2 - "Force" charging mode

Enable support for the "force" mode of USB charging. This should work on Gigabeat S and Nano2g (and any other future target which has a RB usb stack and supports charging) - if a host connection is not detected within 10 seconds of USB insertion, assume that the connected device is an AC charger and charge anyway, if the user has specified "force" as the mode.


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@26594 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 28 insertions, 5 deletions

diff --git a/firmware/usbstack/usb_core.c b/firmware/usbstack/usb_core.c
index dfcce05064..d6c8c6e5cc 100644
--- a/firmware/usbstack/usb_core.c
+++ b/firmware/usbstack/usb_core.c
@@ -169,6 +169,16 @@ static enum { DEFAULT, ADDRESS, CONFIGURED } usb_state;
 #ifdef HAVE_USB_CHARGING_ENABLE
 static int usb_charging_mode = USB_CHARGING_DISABLE;
 static int usb_charging_current_requested = 500;
+static struct timeout usb_no_host_timeout;
+static bool usb_no_host = false;
+
+static int usb_no_host_callback(struct timeout *tmo)
+{
+    (void)tmo;
+    usb_no_host = true;
+    usb_charger_update();
+    return 0;
+}
 #endif
 
 static int usb_core_num_interfaces;
@@ -365,6 +375,10 @@ void usb_core_init(void)
 
     initialized = true;
     usb_state = DEFAULT;
+#ifdef HAVE_USB_CHARGING_ENABLE
+    usb_no_host = false;
+    timeout_register(&usb_no_host_timeout, usb_no_host_callback, HZ*10, 0);
+#endif
     logf("usb_core_init() finished");
 }
 
@@ -384,6 +398,7 @@ void usb_core_exit(void)
     }
     usb_state = DEFAULT;
 #ifdef HAVE_USB_CHARGING_ENABLE
+    usb_no_host = false;
     usb_charging_maxcurrent_change(usb_charging_maxcurrent());
 #endif
     logf("usb_core_exit() finished");
@@ -800,6 +815,13 @@ static void request_handler_endpoint(struct usb_ctrlrequest* req)
 /* Handling USB requests starts here */
 static void usb_core_control_request_handler(struct usb_ctrlrequest* req)
 {
+#ifdef HAVE_USB_CHARGING_ENABLE
+    timeout_cancel(&usb_no_host_timeout);
+    if(usb_no_host) {
+        usb_no_host = false;
+        usb_charging_maxcurrent_change(usb_charging_maxcurrent());
+    }
+#endif
     if(usb_state == DEFAULT) {
         set_serial_descriptor();
         usb_core_set_serial_function_id();
@@ -882,11 +904,12 @@ void usb_charging_enable(int state)
 
 int usb_charging_maxcurrent()
 {
-    if (!initialized
-            || usb_charging_mode == USB_CHARGING_DISABLE
-            || usb_state != CONFIGURED)
+    if (!initialized || usb_charging_mode == USB_CHARGING_DISABLE)
         return 100;
-    /* usb_state == CONFIGURED, charging enabled/forced */
-    return usb_charging_current_requested;
+    if (usb_state == CONFIGURED)
+        return usb_charging_current_requested;
+    if (usb_charging_mode == USB_CHARGING_FORCE && usb_no_host)
+        return 500;
+    return 100;
 }
 #endif