When the usb gadget supporting for usb charger is ready, the usb charger
can implement the usb_charger_plug_by_gadget() function, usb_charger_exit()
function and dev_to_uchger() function by getting 'struct usb_charger' from
'struct gadget'.
Signed-off-by: Baolin Wang <baolin.wang@xxxxxxxxxx>
Reviewed-by: Li Jun <jun.li@xxxxxxx>
Tested-by: Li Jun <jun.li@xxxxxxx>
---
drivers/usb/gadget/udc/charger.c | 62 ++++++++++++++++++++++++++++++++++++--
1 file changed, 60 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/gadget/udc/charger.c b/drivers/usb/gadget/udc/charger.c
index a0dd0cf..e04273c 100644
--- a/drivers/usb/gadget/udc/charger.c
+++ b/drivers/usb/gadget/udc/charger.c
@@ -35,7 +35,9 @@ static unsigned int usb_charger_get_cur_limit(struct usb_charger *uchger);
static struct usb_charger *dev_to_uchger(struct device *dev)
{
- return NULL;
+ struct usb_gadget *gadget = container_of(dev, struct usb_gadget, dev);
+
+ return gadget->charger;
}
/*
@@ -548,11 +550,55 @@ usb_charger_plug_by_extcon(struct notifier_block *nb,
int usb_charger_plug_by_gadget(struct usb_gadget *gadget,
unsigned long state)
{
+ struct usb_charger *uchger = gadget->charger;
+ enum usb_charger_state uchger_state;
+
+ if (WARN(!uchger, "charger can not be NULL"))
+ return -EINVAL;
+
+ /*
+ * Report event to power to setting the current limitation
+ * for this usb charger when one usb charger state is changed
+ * with detecting by usb gadget state.
+ */
+ if (uchger->old_gadget_state != state) {
+ uchger->old_gadget_state = state;
+
+ if (state >= USB_STATE_ATTACHED)
+ uchger_state = USB_CHARGER_PRESENT;
+ else if (state == USB_STATE_NOTATTACHED)
+ uchger_state = USB_CHARGER_REMOVE;
+ else
+ uchger_state = USB_CHARGER_DEFAULT;
+
+ usb_charger_notify_others(uchger, uchger_state);
+ }
+
return 0;
}
EXPORT_SYMBOL_GPL(usb_charger_plug_by_gadget);
/*
+ * usb_charger_unregister() - Unregister a usb charger.
+ * @uchger - the usb charger to be unregistered.
+ */
+static int usb_charger_unregister(struct usb_charger *uchger)
+{
+ if (WARN(!uchger, "charger can not be NULL"))
+ return -EINVAL;
+
+ ida_simple_remove(&usb_charger_ida, uchger->id);
+ sysfs_remove_groups(&uchger->gadget->dev.kobj, usb_charger_groups);
+
+ mutex_lock(&charger_lock);
+ list_del(&uchger->list);
+ mutex_unlock(&charger_lock);
+
+ kfree(uchger);
+ return 0;
+}
+
+/*
* usb_charger_register() - Register a new usb charger.
* @uchger - the new usb charger instance.
*/
@@ -635,6 +681,7 @@ int usb_charger_init(struct usb_gadget *ugadget)
/* register a notifier on a usb gadget device */
uchger->gadget = ugadget;
+ ugadget->charger = uchger;
uchger->old_gadget_state = USB_STATE_NOTATTACHED;
/* register a new usb charger */
@@ -657,7 +704,18 @@ fail:
int usb_charger_exit(struct usb_gadget *ugadget)
{
- return 0;
+ struct usb_charger *uchger = ugadget->charger;
+
+ if (WARN(!uchger, "charger can not be NULL"))
+ return -EINVAL;
+
+ ugadget->charger = NULL;
+ if (uchger->extcon_dev)
+ extcon_unregister_notifier(uchger->extcon_dev,
+ EXTCON_USB,
+ &uchger->extcon_nb.nb);
+
+ return usb_charger_unregister(uchger);
}
MODULE_AUTHOR("Baolin Wang <baolin.wang@xxxxxxxxxx>");
--
1.7.9.5
--
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