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/*
* 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.
* SPDX-License-Identifier: GPL-2.0
*
* Endpoint sysfs stuff
*/
#include <linux/kernel.h>
#include <linux/spinlock.h>
#include <linux/slab.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)
struct ep_attribute {
struct attribute attr;
ssize_t (*show)(struct usb_device *,
struct usb_endpoint_descriptor *, char *);
};
#define to_ep_attribute(_attr) \
container_of(_attr, struct ep_attribute, attr)
#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 sprintf(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 sprintf(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 sprintf(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);
char unit;
unsigned interval = 0;
unsigned in;
in = (ep->desc->bEndpointAddress & USB_DIR_IN);
switch (usb_endpoint_type(ep->desc)) {
case USB_ENDPOINT_XFER_CONTROL:
if (ep->udev->speed == USB_SPEED_HIGH)
/* uframes per NAK */
interval = ep->desc->bInterval;
break;
case USB_ENDPOINT_XFER_ISOC:
interval = 1 << (ep->desc->bInterval - 1);
break;
case USB_ENDPOINT_XFER_BULK:
if (ep->udev->speed == USB_SPEED_HIGH && !in)
/* uframes per NAK */
interval = ep->desc->bInterval;
break;
case USB_ENDPOINT_XFER_INT:
if (ep->udev->speed == USB_SPEED_HIGH)
interval = 1 << (ep->desc->bInterval - 1);
else
interval = ep->desc->bInterval;
break;
}
interval *= (ep->udev->speed == USB_SPEED_HIGH) ? 125 : 1000;
if (interval % 1000)
unit = 'u';
else {
unit = 'm';
interval /= 1000;
}
return sprintf(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 sprintf(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 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);
}
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(sizeof(*ep_dev), GFP_KERNEL);
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;
}
}
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