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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * drivers/usb/core/endpoint.c
4 *
5 * (C) Copyright 2002,2004,2006 Greg Kroah-Hartman
6 * (C) Copyright 2002,2004 IBM Corp.
7 * (C) Copyright 2006 Novell Inc.
8 *
9 * Released under the GPLv2 only.
10 *
11 * Endpoint sysfs stuff
12 */
13
14#include <linux/kernel.h>
15#include <linux/spinlock.h>
16#include <linux/slab.h>
17#include <linux/sysfs.h>
18#include <linux/usb.h>
19#include "usb.h"
20
21struct ep_device {
22 struct usb_endpoint_descriptor *desc;
23 struct usb_device *udev;
24 struct device dev;
25};
26#define to_ep_device(_dev) \
27 container_of(_dev, struct ep_device, dev)
28
29#define usb_ep_attr(field, format_string) \
30static ssize_t field##_show(struct device *dev, \
31 struct device_attribute *attr, \
32 char *buf) \
33{ \
34 struct ep_device *ep = to_ep_device(dev); \
35 return sysfs_emit(buf, format_string, ep->desc->field); \
36} \
37static DEVICE_ATTR_RO(field)
38
39usb_ep_attr(bLength, "%02x\n");
40usb_ep_attr(bEndpointAddress, "%02x\n");
41usb_ep_attr(bmAttributes, "%02x\n");
42usb_ep_attr(bInterval, "%02x\n");
43
44static ssize_t wMaxPacketSize_show(struct device *dev,
45 struct device_attribute *attr, char *buf)
46{
47 struct ep_device *ep = to_ep_device(dev);
48 return sysfs_emit(buf, "%04x\n", usb_endpoint_maxp(ep->desc));
49}
50static DEVICE_ATTR_RO(wMaxPacketSize);
51
52static ssize_t type_show(struct device *dev, struct device_attribute *attr,
53 char *buf)
54{
55 struct ep_device *ep = to_ep_device(dev);
56 char *type = "unknown";
57
58 switch (usb_endpoint_type(ep->desc)) {
59 case USB_ENDPOINT_XFER_CONTROL:
60 type = "Control";
61 break;
62 case USB_ENDPOINT_XFER_ISOC:
63 type = "Isoc";
64 break;
65 case USB_ENDPOINT_XFER_BULK:
66 type = "Bulk";
67 break;
68 case USB_ENDPOINT_XFER_INT:
69 type = "Interrupt";
70 break;
71 }
72 return sysfs_emit(buf, "%s\n", type);
73}
74static DEVICE_ATTR_RO(type);
75
76static ssize_t interval_show(struct device *dev, struct device_attribute *attr,
77 char *buf)
78{
79 struct ep_device *ep = to_ep_device(dev);
80 unsigned int interval;
81 char unit;
82
83 interval = usb_decode_interval(ep->desc, ep->udev->speed);
84 if (interval % 1000) {
85 unit = 'u';
86 } else {
87 unit = 'm';
88 interval /= 1000;
89 }
90
91 return sysfs_emit(buf, "%d%cs\n", interval, unit);
92}
93static DEVICE_ATTR_RO(interval);
94
95static ssize_t direction_show(struct device *dev, struct device_attribute *attr,
96 char *buf)
97{
98 struct ep_device *ep = to_ep_device(dev);
99 char *direction;
100
101 if (usb_endpoint_xfer_control(ep->desc))
102 direction = "both";
103 else if (usb_endpoint_dir_in(ep->desc))
104 direction = "in";
105 else
106 direction = "out";
107 return sysfs_emit(buf, "%s\n", direction);
108}
109static DEVICE_ATTR_RO(direction);
110
111static struct attribute *ep_dev_attrs[] = {
112 &dev_attr_bLength.attr,
113 &dev_attr_bEndpointAddress.attr,
114 &dev_attr_bmAttributes.attr,
115 &dev_attr_bInterval.attr,
116 &dev_attr_wMaxPacketSize.attr,
117 &dev_attr_interval.attr,
118 &dev_attr_type.attr,
119 &dev_attr_direction.attr,
120 NULL,
121};
122static const struct attribute_group ep_dev_attr_grp = {
123 .attrs = ep_dev_attrs,
124};
125static const struct attribute_group *ep_dev_groups[] = {
126 &ep_dev_attr_grp,
127 NULL
128};
129
130static void ep_device_release(struct device *dev)
131{
132 struct ep_device *ep_dev = to_ep_device(dev);
133
134 kfree(ep_dev);
135}
136
137const struct device_type usb_ep_device_type = {
138 .name = "usb_endpoint",
139 .release = ep_device_release,
140};
141
142int usb_create_ep_devs(struct device *parent,
143 struct usb_host_endpoint *endpoint,
144 struct usb_device *udev)
145{
146 struct ep_device *ep_dev;
147 int retval;
148
149 ep_dev = kzalloc_obj(*ep_dev);
150 if (!ep_dev) {
151 retval = -ENOMEM;
152 goto exit;
153 }
154
155 ep_dev->desc = &endpoint->desc;
156 ep_dev->udev = udev;
157 ep_dev->dev.groups = ep_dev_groups;
158 ep_dev->dev.type = &usb_ep_device_type;
159 ep_dev->dev.parent = parent;
160 dev_set_name(&ep_dev->dev, "ep_%02x", endpoint->desc.bEndpointAddress);
161
162 retval = device_register(&ep_dev->dev);
163 if (retval)
164 goto error_register;
165
166 device_enable_async_suspend(&ep_dev->dev);
167 endpoint->ep_dev = ep_dev;
168 return retval;
169
170error_register:
171 put_device(&ep_dev->dev);
172exit:
173 return retval;
174}
175
176void usb_remove_ep_devs(struct usb_host_endpoint *endpoint)
177{
178 struct ep_device *ep_dev = endpoint->ep_dev;
179
180 if (ep_dev) {
181 device_unregister(&ep_dev->dev);
182 endpoint->ep_dev = NULL;
183 }
184}