linux/drivers/usb/core/endpoint.c
Greg Kroah-Hartman aa1f3bb567 USB: core: move existing SPDX tags to top of the file
To match the rest of the kernel, the SPDX tags for the drivers/usb/core/
files are moved to the first line of the file.  This makes it more
obvious the tag is present as well as making it match the other 12k
files in the tree with this location.

It also uses // to match the "expected style" as well.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-03 10:12:26 +01:00

219 lines
4.9 KiB
C

// 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/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;
}
}