// SPDX-License-Identifier: GPL-2.0/* * drivers/usb/core/endpoint.c * * (C) Copyright 2002,2004,2006 Greg Kroah-Hartman * (C) Copyright 2002,2004 IBM Corp. * (C) Copyright 2006 Novell Inc. * * Released under the GPLv2 only. * * Endpoint sysfs stuff */ #include <linux/kernel.h>#include <linux/spinlock.h>#include <linux/slab.h>#include <linux/sysfs.h>#include <linux/usb.h>#include "usb.h" struct ep_device {	struct usb_endpoint_descriptor *desc;	struct usb_device *udev;	struct device dev;};#define to_ep_device(_dev) \	container_of(_dev, struct ep_device, dev) #define usb_ep_attr(field, format_string)			\static ssize_t field##_show(struct device *dev,			\			       struct device_attribute *attr,	\			       char *buf)			\{								\	struct ep_device *ep = to_ep_device(dev);		\	return sysfs_emit(buf, format_string, ep->desc->field);	\}								\static DEVICE_ATTR_RO(field) usb_ep_attr(bLength, "%02x\n");usb_ep_attr(bEndpointAddress, "%02x\n");usb_ep_attr(bmAttributes, "%02x\n");usb_ep_attr(bInterval, "%02x\n"); static ssize_t wMaxPacketSize_show(struct device *dev,				   struct device_attribute *attr, char *buf){	struct ep_device *ep = to_ep_device(dev);	return sysfs_emit(buf, "%04x\n", usb_endpoint_maxp(ep->desc));}static DEVICE_ATTR_RO(wMaxPacketSize); static ssize_t type_show(struct device *dev, struct device_attribute *attr,			 char *buf){	struct ep_device *ep = to_ep_device(dev);	char *type = "unknown"; 	switch (usb_endpoint_type(ep->desc)) {	case USB_ENDPOINT_XFER_CONTROL:		type = "Control";		break;	case USB_ENDPOINT_XFER_ISOC:		type = "Isoc";		break;	case USB_ENDPOINT_XFER_BULK:		type = "Bulk";		break;	case USB_ENDPOINT_XFER_INT:		type = "Interrupt";		break;	}	return sysfs_emit(buf, "%s\n", type);}static DEVICE_ATTR_RO(type); static ssize_t interval_show(struct device *dev, struct device_attribute *attr,			     char *buf){	struct ep_device *ep = to_ep_device(dev);	unsigned int interval;	char unit; 	interval = usb_decode_interval(ep->desc, ep->udev->speed);	if (interval % 1000) {		unit = 'u';	} else {		unit = 'm';		interval /= 1000;	} 	return sysfs_emit(buf, "%d%cs\n", interval, unit);}static DEVICE_ATTR_RO(interval); static ssize_t direction_show(struct device *dev, struct device_attribute *attr,			      char *buf){	struct ep_device *ep = to_ep_device(dev);	char *direction; 	if (usb_endpoint_xfer_control(ep->desc))		direction = "both";	else if (usb_endpoint_dir_in(ep->desc))		direction = "in";	else		direction = "out";	return sysfs_emit(buf, "%s\n", direction);}static DEVICE_ATTR_RO(direction); static struct attribute *ep_dev_attrs[] = {	&dev_attr_bLength.attr,	&dev_attr_bEndpointAddress.attr,	&dev_attr_bmAttributes.attr,	&dev_attr_bInterval.attr,	&dev_attr_wMaxPacketSize.attr,	&dev_attr_interval.attr,	&dev_attr_type.attr,	&dev_attr_direction.attr,	NULL,};static const struct attribute_group ep_dev_attr_grp = {	.attrs = ep_dev_attrs,};static const struct attribute_group *ep_dev_groups[] = {	&ep_dev_attr_grp,	NULL}; static void ep_device_release(struct device *dev){	struct ep_device *ep_dev = to_ep_device(dev); 	kfree(ep_dev);} const struct device_type usb_ep_device_type = {	.name =		"usb_endpoint",	.release = ep_device_release,}; int usb_create_ep_devs(struct device *parent,			struct usb_host_endpoint *endpoint,			struct usb_device *udev){	struct ep_device *ep_dev;	int retval; 	ep_dev = kzalloc_obj(*ep_dev);	if (!ep_dev) {		retval = -ENOMEM;		goto exit;	} 	ep_dev->desc = &endpoint->desc;	ep_dev->udev = udev;	ep_dev->dev.groups = ep_dev_groups;	ep_dev->dev.type = &usb_ep_device_type;	ep_dev->dev.parent = parent;	dev_set_name(&ep_dev->dev, "ep_%02x", endpoint->desc.bEndpointAddress); 	retval = device_register(&ep_dev->dev);	if (retval)		goto error_register; 	device_enable_async_suspend(&ep_dev->dev);	endpoint->ep_dev = ep_dev;	return retval; error_register:	put_device(&ep_dev->dev);exit:	return retval;} void usb_remove_ep_devs(struct usb_host_endpoint *endpoint){	struct ep_device *ep_dev = endpoint->ep_dev; 	if (ep_dev) {		device_unregister(&ep_dev->dev);		endpoint->ep_dev = NULL;	}}