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Date: Thu, 6 Aug 2015 15:03:49 +0800
From: Baolin Wang <baolin.wang@...aro.org>
To: balbi@...com
Cc: broonie@...nel.org, linux-kernel@...r.kernel.org,
baolin.wang@...aro.org, gregkh@...uxfoundation.org,
peter.chen@...escale.com, sojka@...ica.cz,
stern@...land.harvard.edu, andreas@...sler.com,
linux-usb@...r.kernel.org,
device-mainlining@...ts.linuxfoundation.org
Subject: [PATCH 2/2] gadget: Support for the usb charger framework
The usb charger framework is based on usb gadget, and each usb gadget
can be one usb charger to set the current limitation.
This patch adds a notifier mechanism for usb charger to report to usb
charger when the usb gadget state is changed.
Also we introduce a callback 'get_charger_type' which will implemented
by user for usb gadget operations to get the usb charger type.
Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
---
drivers/usb/gadget/udc/udc-core.c | 41 +++++++++++++++++++++++++++++++++++++
include/linux/usb/gadget.h | 20 ++++++++++++++++++
2 files changed, 61 insertions(+)
diff --git a/drivers/usb/gadget/udc/udc-core.c b/drivers/usb/gadget/udc/udc-core.c
index d69c355..d5368088 100644
--- a/drivers/usb/gadget/udc/udc-core.c
+++ b/drivers/usb/gadget/udc/udc-core.c
@@ -28,6 +28,7 @@
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <linux/usb.h>
+#include <linux/usb/usb_charger.h>
/**
* struct usb_udc - describes one usb device controller
@@ -127,12 +128,45 @@ void usb_gadget_giveback_request(struct usb_ep *ep,
}
EXPORT_SYMBOL_GPL(usb_gadget_giveback_request);
+int usb_gadget_register_notify(struct usb_gadget *gadget,
+ struct notifier_block *nb)
+{
+ unsigned long flags;
+ int ret;
+
+ spin_lock_irqsave(&gadget->lock, flags);
+ ret = raw_notifier_chain_register(&gadget->nh, nb);
+ spin_unlock_irqrestore(&gadget->lock, flags);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(usb_gadget_register_notify);
+
+int usb_gadget_unregister_notify(struct usb_gadget *gadget,
+ struct notifier_block *nb)
+{
+ unsigned long flags;
+ int ret;
+
+ spin_lock_irqsave(&gadget->lock, flags);
+ ret = raw_notifier_chain_unregister(&gadget->nh, nb);
+ spin_unlock_irqrestore(&gadget->lock, flags);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(usb_gadget_unregister_notify);
+
/* ------------------------------------------------------------------------- */
static void usb_gadget_state_work(struct work_struct *work)
{
struct usb_gadget *gadget = work_to_gadget(work);
struct usb_udc *udc = gadget->udc;
+ unsigned long flags;
+
+ spin_lock_irqsave(&gadget->lock, flags);
+ raw_notifier_call_chain(&gadget->nh, gadget->state, gadget);
+ spin_unlock_irqrestore(&gadget->lock, flags);
if (udc)
sysfs_notify(&udc->dev.kobj, NULL, "state");
@@ -272,6 +306,8 @@ int usb_add_gadget_udc_release(struct device *parent, struct usb_gadget *gadget,
dev_set_name(&gadget->dev, "gadget");
INIT_WORK(&gadget->work, usb_gadget_state_work);
+ RAW_INIT_NOTIFIER_HEAD(&gadget->nh);
+ spin_lock_init(&gadget->lock);
gadget->dev.parent = parent;
#ifdef CONFIG_HAS_DMA
@@ -313,6 +349,10 @@ int usb_add_gadget_udc_release(struct device *parent, struct usb_gadget *gadget,
mutex_unlock(&udc_lock);
+ ret = usb_charger_init(gadget);
+ if (ret)
+ goto err4;
+
return 0;
err4:
@@ -388,6 +428,7 @@ void usb_del_gadget_udc(struct usb_gadget *gadget)
kobject_uevent(&udc->dev.kobj, KOBJ_REMOVE);
flush_work(&gadget->work);
device_unregister(&udc->dev);
+ usb_charger_exit(gadget);
device_unregister(&gadget->dev);
}
EXPORT_SYMBOL_GPL(usb_del_gadget_udc);
diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
index 4f3dfb7..f24d6ac 100644
--- a/include/linux/usb/gadget.h
+++ b/include/linux/usb/gadget.h
@@ -492,6 +492,7 @@ struct usb_gadget_ops {
int (*udc_start)(struct usb_gadget *,
struct usb_gadget_driver *);
int (*udc_stop)(struct usb_gadget *);
+ enum usb_charger_type (*get_charger_type)(struct usb_gadget *);
};
/**
@@ -559,6 +560,9 @@ struct usb_gadget {
struct device dev;
unsigned out_epnum;
unsigned in_epnum;
+ struct raw_notifier_head nh;
+ struct usb_charger *uchger;
+ spinlock_t lock;
unsigned sg_supported:1;
unsigned is_otg:1;
@@ -1014,6 +1018,22 @@ extern void usb_gadget_unmap_request(struct usb_gadget *gadget,
/*-------------------------------------------------------------------------*/
+/**
+ * Register a notifiee to get notified by any attach status changes from
+ * the usb gadget
+ */
+int usb_gadget_register_notify(struct usb_gadget *gadget,
+ struct notifier_block *nb);
+
+/*-------------------------------------------------------------------------*/
+
+
+/* Unregister a notifiee from the usb gadget */
+int usb_gadget_unregister_notify(struct usb_gadget *gadget,
+ struct notifier_block *nb);
+
+/*-------------------------------------------------------------------------*/
+
/* utility to set gadget state properly */
extern void usb_gadget_set_state(struct usb_gadget *gadget,
--
1.7.9.5
--
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