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.w...@linaro.org>
---
drivers/usb/gadget/udc/udc-core.c | 38 +++++++++++++++++++++++++++++++++++++
include/linux/usb/gadget.h | 20 +++++++++++++++++++
2 files changed, 58 insertions(+)
diff --git a/drivers/usb/gadget/udc/udc-core.c
b/drivers/usb/gadget/udc/udc-core.c
index f660afb..47b231c 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
@@ -129,6 +130,32 @@ 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)
+{
+ int ret;
+
+ mutex_lock(&gadget->lock);
+ ret = raw_notifier_chain_register(&gadget->nh, nb);
+ mutex_unlock(&gadget->lock);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(usb_gadget_register_notify);
+
+int usb_gadget_unregister_notify(struct usb_gadget *gadget,
+ struct notifier_block *nb)
+{
+ int ret;
+
+ mutex_lock(&gadget->lock);
+ ret = raw_notifier_chain_unregister(&gadget->nh, nb);
+ mutex_unlock(&gadget->lock);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(usb_gadget_unregister_notify);
+
/* ------------------------------------------------------------------------- */
/**
@@ -226,6 +253,10 @@ static void usb_gadget_state_work(struct work_struct *work)
struct usb_gadget *gadget = work_to_gadget(work);
struct usb_udc *udc = gadget->udc;
+ mutex_lock(&gadget->lock);
+ raw_notifier_call_chain(&gadget->nh, gadget->state, gadget);
+ mutex_unlock(&gadget->lock);
+
if (udc)
sysfs_notify(&udc->dev.kobj, NULL, "state");
}
@@ -364,6 +395,8 @@ 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);
+ mutex_init(&gadget->lock);
gadget->dev.parent = parent;
#ifdef CONFIG_HAS_DMA
@@ -405,6 +438,10 @@ 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:
@@ -481,6 +518,7 @@ 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 c14a69b..78cc862 100644
--- a/include/linux/usb/gadget.h
+++ b/include/linux/usb/gadget.h
@@ -537,6 +537,7 @@ struct usb_gadget_ops {
struct usb_ep *(*match_ep)(struct usb_gadget *,
struct usb_endpoint_descriptor *,
struct usb_ss_ep_comp_descriptor *);
+ enum usb_charger_type (*get_charger_type)(struct usb_gadget *);
};
/**
@@ -609,6 +610,9 @@ struct usb_gadget {
unsigned out_epnum;
unsigned in_epnum;
struct usb_otg_caps *otg_caps;
+ struct raw_notifier_head nh;
+ struct usb_charger *uchger;
+ struct mutex lock;
unsigned sg_supported:1;
unsigned is_otg:1;
@@ -1183,6 +1187,22 @@ 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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