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 unsigned int interval; 88 char unit; 89 90 interval = usb_decode_interval(ep->desc, ep->udev->speed); 91 if (interval % 1000) { 92 unit = 'u'; 93 } else { 94 unit = 'm'; 95 interval /= 1000; 96 } 97 98 return sprintf(buf, "%d%cs\n", interval, unit); 99 } 100 static DEVICE_ATTR_RO(interval); 101 102 static ssize_t direction_show(struct device *dev, struct device_attribute *attr, 103 char *buf) 104 { 105 struct ep_device *ep = to_ep_device(dev); 106 char *direction; 107 108 if (usb_endpoint_xfer_control(ep->desc)) 109 direction = "both"; 110 else if (usb_endpoint_dir_in(ep->desc)) 111 direction = "in"; 112 else 113 direction = "out"; 114 return sprintf(buf, "%s\n", direction); 115 } 116 static DEVICE_ATTR_RO(direction); 117 118 static struct attribute *ep_dev_attrs[] = { 119 &dev_attr_bLength.attr, 120 &dev_attr_bEndpointAddress.attr, 121 &dev_attr_bmAttributes.attr, 122 &dev_attr_bInterval.attr, 123 &dev_attr_wMaxPacketSize.attr, 124 &dev_attr_interval.attr, 125 &dev_attr_type.attr, 126 &dev_attr_direction.attr, 127 NULL, 128 }; 129 static const struct attribute_group ep_dev_attr_grp = { 130 .attrs = ep_dev_attrs, 131 }; 132 static const struct attribute_group *ep_dev_groups[] = { 133 &ep_dev_attr_grp, 134 NULL 135 }; 136 137 static void ep_device_release(struct device *dev) 138 { 139 struct ep_device *ep_dev = to_ep_device(dev); 140 141 kfree(ep_dev); 142 } 143 144 struct device_type usb_ep_device_type = { 145 .name = "usb_endpoint", 146 .release = ep_device_release, 147 }; 148 149 int usb_create_ep_devs(struct device *parent, 150 struct usb_host_endpoint *endpoint, 151 struct usb_device *udev) 152 { 153 struct ep_device *ep_dev; 154 int retval; 155 156 ep_dev = kzalloc(sizeof(*ep_dev), GFP_KERNEL); 157 if (!ep_dev) { 158 retval = -ENOMEM; 159 goto exit; 160 } 161 162 ep_dev->desc = &endpoint->desc; 163 ep_dev->udev = udev; 164 ep_dev->dev.groups = ep_dev_groups; 165 ep_dev->dev.type = &usb_ep_device_type; 166 ep_dev->dev.parent = parent; 167 dev_set_name(&ep_dev->dev, "ep_%02x", endpoint->desc.bEndpointAddress); 168 169 retval = device_register(&ep_dev->dev); 170 if (retval) 171 goto error_register; 172 173 device_enable_async_suspend(&ep_dev->dev); 174 endpoint->ep_dev = ep_dev; 175 return retval; 176 177 error_register: 178 put_device(&ep_dev->dev); 179 exit: 180 return retval; 181 } 182 183 void usb_remove_ep_devs(struct usb_host_endpoint *endpoint) 184 { 185 struct ep_device *ep_dev = endpoint->ep_dev; 186 187 if (ep_dev) { 188 device_unregister(&ep_dev->dev); 189 endpoint->ep_dev = NULL; 190 } 191 } 192