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/usb.h> 18 #include "usb.h" 19 20 struct ep_device { 21 struct usb_endpoint_descriptor *desc; 22 struct usb_device *udev; 23 struct device dev; 24 }; 25 #define to_ep_device(_dev) \ 26 container_of(_dev, struct ep_device, dev) 27 28 struct ep_attribute { 29 struct attribute attr; 30 ssize_t (*show)(struct usb_device *, 31 struct usb_endpoint_descriptor *, char *); 32 }; 33 #define to_ep_attribute(_attr) \ 34 container_of(_attr, struct ep_attribute, attr) 35 36 #define usb_ep_attr(field, format_string) \ 37 static ssize_t field##_show(struct device *dev, \ 38 struct device_attribute *attr, \ 39 char *buf) \ 40 { \ 41 struct ep_device *ep = to_ep_device(dev); \ 42 return sprintf(buf, format_string, ep->desc->field); \ 43 } \ 44 static DEVICE_ATTR_RO(field) 45 46 usb_ep_attr(bLength, "%02x\n"); 47 usb_ep_attr(bEndpointAddress, "%02x\n"); 48 usb_ep_attr(bmAttributes, "%02x\n"); 49 usb_ep_attr(bInterval, "%02x\n"); 50 51 static ssize_t wMaxPacketSize_show(struct device *dev, 52 struct device_attribute *attr, char *buf) 53 { 54 struct ep_device *ep = to_ep_device(dev); 55 return sprintf(buf, "%04x\n", usb_endpoint_maxp(ep->desc)); 56 } 57 static DEVICE_ATTR_RO(wMaxPacketSize); 58 59 static ssize_t type_show(struct device *dev, struct device_attribute *attr, 60 char *buf) 61 { 62 struct ep_device *ep = to_ep_device(dev); 63 char *type = "unknown"; 64 65 switch (usb_endpoint_type(ep->desc)) { 66 case USB_ENDPOINT_XFER_CONTROL: 67 type = "Control"; 68 break; 69 case USB_ENDPOINT_XFER_ISOC: 70 type = "Isoc"; 71 break; 72 case USB_ENDPOINT_XFER_BULK: 73 type = "Bulk"; 74 break; 75 case USB_ENDPOINT_XFER_INT: 76 type = "Interrupt"; 77 break; 78 } 79 return sprintf(buf, "%s\n", type); 80 } 81 static DEVICE_ATTR_RO(type); 82 83 static ssize_t interval_show(struct device *dev, struct device_attribute *attr, 84 char *buf) 85 { 86 struct ep_device *ep = to_ep_device(dev); 87 char unit; 88 unsigned interval = 0; 89 unsigned in; 90 91 in = (ep->desc->bEndpointAddress & USB_DIR_IN); 92 93 switch (usb_endpoint_type(ep->desc)) { 94 case USB_ENDPOINT_XFER_CONTROL: 95 if (ep->udev->speed == USB_SPEED_HIGH) 96 /* uframes per NAK */ 97 interval = ep->desc->bInterval; 98 break; 99 100 case USB_ENDPOINT_XFER_ISOC: 101 interval = 1 << (ep->desc->bInterval - 1); 102 break; 103 104 case USB_ENDPOINT_XFER_BULK: 105 if (ep->udev->speed == USB_SPEED_HIGH && !in) 106 /* uframes per NAK */ 107 interval = ep->desc->bInterval; 108 break; 109 110 case USB_ENDPOINT_XFER_INT: 111 if (ep->udev->speed == USB_SPEED_HIGH) 112 interval = 1 << (ep->desc->bInterval - 1); 113 else 114 interval = ep->desc->bInterval; 115 break; 116 } 117 interval *= (ep->udev->speed == USB_SPEED_HIGH) ? 125 : 1000; 118 if (interval % 1000) 119 unit = 'u'; 120 else { 121 unit = 'm'; 122 interval /= 1000; 123 } 124 125 return sprintf(buf, "%d%cs\n", interval, unit); 126 } 127 static DEVICE_ATTR_RO(interval); 128 129 static ssize_t direction_show(struct device *dev, struct device_attribute *attr, 130 char *buf) 131 { 132 struct ep_device *ep = to_ep_device(dev); 133 char *direction; 134 135 if (usb_endpoint_xfer_control(ep->desc)) 136 direction = "both"; 137 else if (usb_endpoint_dir_in(ep->desc)) 138 direction = "in"; 139 else 140 direction = "out"; 141 return sprintf(buf, "%s\n", direction); 142 } 143 static DEVICE_ATTR_RO(direction); 144 145 static struct attribute *ep_dev_attrs[] = { 146 &dev_attr_bLength.attr, 147 &dev_attr_bEndpointAddress.attr, 148 &dev_attr_bmAttributes.attr, 149 &dev_attr_bInterval.attr, 150 &dev_attr_wMaxPacketSize.attr, 151 &dev_attr_interval.attr, 152 &dev_attr_type.attr, 153 &dev_attr_direction.attr, 154 NULL, 155 }; 156 static struct attribute_group ep_dev_attr_grp = { 157 .attrs = ep_dev_attrs, 158 }; 159 static const struct attribute_group *ep_dev_groups[] = { 160 &ep_dev_attr_grp, 161 NULL 162 }; 163 164 static void ep_device_release(struct device *dev) 165 { 166 struct ep_device *ep_dev = to_ep_device(dev); 167 168 kfree(ep_dev); 169 } 170 171 struct device_type usb_ep_device_type = { 172 .name = "usb_endpoint", 173 .release = ep_device_release, 174 }; 175 176 int usb_create_ep_devs(struct device *parent, 177 struct usb_host_endpoint *endpoint, 178 struct usb_device *udev) 179 { 180 struct ep_device *ep_dev; 181 int retval; 182 183 ep_dev = kzalloc(sizeof(*ep_dev), GFP_KERNEL); 184 if (!ep_dev) { 185 retval = -ENOMEM; 186 goto exit; 187 } 188 189 ep_dev->desc = &endpoint->desc; 190 ep_dev->udev = udev; 191 ep_dev->dev.groups = ep_dev_groups; 192 ep_dev->dev.type = &usb_ep_device_type; 193 ep_dev->dev.parent = parent; 194 dev_set_name(&ep_dev->dev, "ep_%02x", endpoint->desc.bEndpointAddress); 195 196 retval = device_register(&ep_dev->dev); 197 if (retval) 198 goto error_register; 199 200 device_enable_async_suspend(&ep_dev->dev); 201 endpoint->ep_dev = ep_dev; 202 return retval; 203 204 error_register: 205 put_device(&ep_dev->dev); 206 exit: 207 return retval; 208 } 209 210 void usb_remove_ep_devs(struct usb_host_endpoint *endpoint) 211 { 212 struct ep_device *ep_dev = endpoint->ep_dev; 213 214 if (ep_dev) { 215 device_unregister(&ep_dev->dev); 216 endpoint->ep_dev = NULL; 217 } 218 } 219