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Subject[RFC][PATCH v2 04/13] usb: gadget: add usb_gadget_start/stop()
Date
The OTG state machine needs a mechanism to start and
stop the gadget controller. Add usb_gadget_start()
and usb_gadget_stop().

Signed-off-by: Roger Quadros <rogerq@ti.com>
---
drivers/usb/gadget/udc/udc-core.c | 74 +++++++++++++++++++++++++++++++++++++++
include/linux/usb/gadget.h | 3 ++
2 files changed, 77 insertions(+)

diff --git a/drivers/usb/gadget/udc/udc-core.c b/drivers/usb/gadget/udc/udc-core.c
index 5a81cb0..3aa5dd5 100644
--- a/drivers/usb/gadget/udc/udc-core.c
+++ b/drivers/usb/gadget/udc/udc-core.c
@@ -187,6 +187,7 @@ EXPORT_SYMBOL_GPL(usb_gadget_udc_reset);
*/
static inline int usb_gadget_udc_start(struct usb_udc *udc)
{
+ dev_dbg(&udc->dev, "%s\n", __func__);
return udc->gadget->ops->udc_start(udc->gadget, udc->driver);
}

@@ -204,10 +205,83 @@ static inline int usb_gadget_udc_start(struct usb_udc *udc)
*/
static inline void usb_gadget_udc_stop(struct usb_udc *udc)
{
+ dev_dbg(&udc->dev, "%s\n", __func__);
udc->gadget->ops->udc_stop(udc->gadget);
}

/**
+ * usb_gadget_start - start the usb gadget controller and connect to bus
+ * @gadget: the gadget device to start
+ *
+ * This is external API for use by OTG core.
+ *
+ * Start the usb device controller and connect to bus (enable pull).
+ */
+int usb_gadget_start(struct usb_gadget *gadget)
+{
+ int ret;
+ struct usb_udc *udc = NULL;
+
+ dev_dbg(&gadget->dev, "%s\n", __func__);
+ mutex_lock(&udc_lock);
+ list_for_each_entry(udc, &udc_list, list)
+ if (udc->gadget == gadget)
+ goto found;
+
+ dev_err(gadget->dev.parent, "%s: gadget not registered.\n",
+ __func__);
+ mutex_unlock(&udc_lock);
+ return -EINVAL;
+
+found:
+ ret = usb_gadget_udc_start(udc);
+ if (ret)
+ dev_err(&udc->dev, "USB Device Controller didn't start: %d\n",
+ ret);
+ else
+ usb_gadget_connect(udc->gadget);
+
+ mutex_unlock(&udc_lock);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(usb_gadget_start);
+
+/**
+ * usb_gadget_stop - disconnect from bus and stop the usb gadget
+ * @gadget: The gadget device we want to stop
+ *
+ * This is external API for use by OTG core.
+ *
+ * Disconnect from the bus (disable pull) and stop the
+ * gadget controller.
+ */
+int usb_gadget_stop(struct usb_gadget *gadget)
+{
+ struct usb_udc *udc = NULL;
+
+ dev_dbg(&gadget->dev, "%s\n", __func__);
+ mutex_lock(&udc_lock);
+ list_for_each_entry(udc, &udc_list, list)
+ if (udc->gadget == gadget)
+ goto found;
+
+ dev_err(gadget->dev.parent, "%s: gadget not registered.\n",
+ __func__);
+ mutex_unlock(&udc_lock);
+ return -EINVAL;
+
+found:
+ usb_gadget_disconnect(udc->gadget);
+ udc->driver->disconnect(udc->gadget);
+ usb_gadget_udc_stop(udc);
+ mutex_unlock(&udc_lock);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(usb_gadget_stop);
+
+/**
* usb_udc_release - release the usb_udc struct
* @dev: the dev member within usb_udc
*
diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
index e2f00fd..7ada7e6 100644
--- a/include/linux/usb/gadget.h
+++ b/include/linux/usb/gadget.h
@@ -922,6 +922,9 @@ int usb_gadget_probe_driver(struct usb_gadget_driver *driver);
*/
int usb_gadget_unregister_driver(struct usb_gadget_driver *driver);

+int usb_gadget_start(struct usb_gadget *gadget);
+int usb_gadget_stop(struct usb_gadget *gadget);
+
extern int usb_add_gadget_udc_release(struct device *parent,
struct usb_gadget *gadget, void (*release)(struct device *dev));
extern int usb_add_gadget_udc(struct device *parent, struct usb_gadget *gadget);
--
2.1.0


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