linux-kernel - [PATCH v10 3/4] gadget: Integrate with the usb gadget supporting for usb charger

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Message-Id: <8756ede40a4ffcdfe7ec97703186d42bf8a491ca.1460029375.git.baolin.wang@linaro.org>
Date:	Thu,  7 Apr 2016 19:48:45 +0800
From:	Baolin Wang <baolin.wang@...aro.org>
To:	balbi@...nel.org, gregkh@...uxfoundation.org, sre@...nel.org,
	dbaryshkov@...il.com, dwmw2@...radead.org
Cc:	peter.chen@...escale.com, stern@...land.harvard.edu,
	r.baldyga@...sung.com, yoshihiro.shimoda.uh@...esas.com,
	lee.jones@...aro.org, broonie@...nel.org,
	ckeepax@...nsource.wolfsonmicro.com,
	patches@...nsource.wolfsonmicro.com, baolin.wang@...aro.org,
	linux-pm@...r.kernel.org, linux-usb@...r.kernel.org,
	device-mainlining@...ts.linuxfoundation.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v10 3/4] gadget: Integrate with the usb gadget supporting for usb charger

When the usb gadget supporting for usb charger is ready, the usb charger
can implement the usb_charger_plug_by_gadget() function and usb_charger_exit()
function by getting 'struct usb_charger' from 'struct gadget'.

Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
---
 drivers/usb/gadget/udc/charger.c |   39 +++++++++++++++++++++++++++++++++++++-
 1 file changed, 38 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/udc/charger.c b/drivers/usb/gadget/udc/charger.c
index e24cb0a..ee711cd 100644
--- a/drivers/usb/gadget/udc/charger.c
+++ b/drivers/usb/gadget/udc/charger.c
@@ -527,6 +527,30 @@ 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);
@@ -683,6 +707,7 @@ 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 = ugadget->state;
 
 	/* register a new usb charger */
@@ -703,7 +728,19 @@ 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;
+
+	if (uchger->extcon_dev)
+		extcon_unregister_notifier(uchger->extcon_dev,
+					   EXTCON_USB,
+					   &uchger->extcon_nb.nb);
+
+	ida_simple_remove(&usb_charger_ida, uchger->id);
+
+	return usb_charger_unregister(uchger);
 }
 
 static int __init usb_charger_class_init(void)
-- 
1.7.9.5