// 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)

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 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;
        }
}