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Commit 4c49a5f0 authored by Sebastian Andrzej Siewior's avatar Sebastian Andrzej Siewior Committed by Felipe Balbi
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usb: gadget: udc-core: introduce UDC binding by name 



This patch adds udc_attach_driver() which allows to bind an UDC which is
specified by name to a driver. The name of available UDCs can be
obtained from /sys/class/udc. This interface is intended for configfs
interface.

Signed-off-by: default avatarSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
parent 0062f6e5

drivers/usb/gadget/udc-core.c

+51 −21
Original line number Diff line number Diff line
@@ -311,26 +311,10 @@ EXPORT_SYMBOL_GPL(usb_del_gadget_udc); 


/* ------------------------------------------------------------------------- */



int usb_gadget_probe_driver(struct usb_gadget_driver *driver)

static int udc_bind_to_driver(struct usb_udc *udc, struct usb_gadget_driver *driver)

{

	struct usb_udc		*udc = NULL;

	int ret;



	if (!driver || !driver->bind || !driver->setup)

		return -EINVAL;



	mutex_lock(&udc_lock);

	list_for_each_entry(udc, &udc_list, list) {

		/* For now we take the first one */

		if (!udc->driver)

			goto found;

	}



	pr_debug("couldn't find an available UDC\n");

	mutex_unlock(&udc_lock);

	return -ENODEV;



found:

	dev_dbg(&udc->dev, "registering UDC driver [%s]\n",

			driver->function);
@@ -352,18 +336,64 @@ found: 
		ret = usb_gadget_start(udc->gadget, driver, driver->bind);

		if (ret)

			goto err1;



	}



	kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE);

	mutex_unlock(&udc_lock);

	return 0;



err1:

	dev_err(&udc->dev, "failed to start %s: %d\n",

			udc->driver->function, ret);

	udc->driver = NULL;

	udc->dev.driver = NULL;

	return ret;

}



int udc_attach_driver(const char *name, struct usb_gadget_driver *driver)

{

	struct usb_udc *udc = NULL;

	int ret = -ENODEV;



	mutex_lock(&udc_lock);

	list_for_each_entry(udc, &udc_list, list) {

		ret = strcmp(name, dev_name(&udc->dev));

		if (!ret)

			break;

	}

	if (ret) {

		ret = -ENODEV;

		goto out;

	}

	if (udc->driver) {

		ret = -EBUSY;

		goto out;

	}

	ret = udc_bind_to_driver(udc, driver);

out:

	mutex_unlock(&udc_lock);

	return ret;

}

EXPORT_SYMBOL_GPL(udc_attach_driver);



int usb_gadget_probe_driver(struct usb_gadget_driver *driver)

{

	struct usb_udc		*udc = NULL;

	int			ret;



	if (!driver || !driver->bind || !driver->setup)

		return -EINVAL;



	mutex_lock(&udc_lock);

	list_for_each_entry(udc, &udc_list, list) {

		/* For now we take the first one */

		if (!udc->driver)

			goto found;

	}



	pr_debug("couldn't find an available UDC\n");

	mutex_unlock(&udc_lock);

	return -ENODEV;

found:

	ret = udc_bind_to_driver(udc, driver);

	mutex_unlock(&udc_lock);

	return ret;

}

include/linux/usb/gadget.h

+2 −0
Original line number Diff line number Diff line
@@ -880,6 +880,8 @@ int usb_gadget_unregister_driver(struct usb_gadget_driver *driver); 


extern int usb_add_gadget_udc(struct device *parent, struct usb_gadget *gadget);

extern void usb_del_gadget_udc(struct usb_gadget *gadget);

extern int udc_attach_driver(const char *name,

		struct usb_gadget_driver *driver);



/*-------------------------------------------------------------------------*/