1/* 2 * drivers/usb/core/endpoint.c 3 * 4 * (C) Copyright 2002,2004,2006 Greg Kroah-Hartman 5 * (C) Copyright 2002,2004 IBM Corp. 6 * (C) Copyright 2006 Novell Inc. 7 * 8 * Endpoint sysfs stuff 9 * 10 */ 11 12#include <linux/kernel.h> 13#include <linux/spinlock.h> 14#include <linux/slab.h> 15#include <linux/idr.h> 16#include <linux/usb.h> 17#include "usb.h" 18 19struct ep_device { 20 struct usb_endpoint_descriptor *desc; 21 struct usb_device *udev; 22 struct device dev; 23}; 24#define to_ep_device(_dev) \ 25 container_of(_dev, struct ep_device, dev) 26 27struct device_type usb_ep_device_type = { 28 .name = "usb_endpoint", 29}; 30 31struct ep_attribute { 32 struct attribute attr; 33 ssize_t (*show)(struct usb_device *, 34 struct usb_endpoint_descriptor *, char *); 35}; 36#define to_ep_attribute(_attr) \ 37 container_of(_attr, struct ep_attribute, attr) 38 39#define usb_ep_attr(field, format_string) \ 40static ssize_t show_ep_##field(struct device *dev, \ 41 struct device_attribute *attr, \ 42 char *buf) \ 43{ \ 44 struct ep_device *ep = to_ep_device(dev); \ 45 return sprintf(buf, format_string, ep->desc->field); \ 46} \ 47static DEVICE_ATTR(field, S_IRUGO, show_ep_##field, NULL); 48 49usb_ep_attr(bLength, "%02x\n") 50usb_ep_attr(bEndpointAddress, "%02x\n") 51usb_ep_attr(bmAttributes, "%02x\n") 52usb_ep_attr(bInterval, "%02x\n") 53 54static ssize_t show_ep_wMaxPacketSize(struct device *dev, 55 struct device_attribute *attr, char *buf) 56{ 57 struct ep_device *ep = to_ep_device(dev); 58 return sprintf(buf, "%04x\n", 59 le16_to_cpu(ep->desc->wMaxPacketSize) & 0x07ff); 60} 61static DEVICE_ATTR(wMaxPacketSize, S_IRUGO, show_ep_wMaxPacketSize, NULL); 62 63static ssize_t show_ep_type(struct device *dev, struct device_attribute *attr, 64 char *buf) 65{ 66 struct ep_device *ep = to_ep_device(dev); 67 char *type = "unknown"; 68 69 switch (usb_endpoint_type(ep->desc)) { 70 case USB_ENDPOINT_XFER_CONTROL: 71 type = "Control"; 72 break; 73 case USB_ENDPOINT_XFER_ISOC: 74 type = "Isoc"; 75 break; 76 case USB_ENDPOINT_XFER_BULK: 77 type = "Bulk"; 78 break; 79 case USB_ENDPOINT_XFER_INT: 80 type = "Interrupt"; 81 break; 82 } 83 return sprintf(buf, "%s\n", type); 84} 85static DEVICE_ATTR(type, S_IRUGO, show_ep_type, NULL); 86 87static ssize_t show_ep_interval(struct device *dev, 88 struct device_attribute *attr, char *buf) 89{ 90 struct ep_device *ep = to_ep_device(dev); 91 char unit; 92 unsigned interval = 0; 93 unsigned in; 94 95 in = (ep->desc->bEndpointAddress & USB_DIR_IN); 96 97 switch (usb_endpoint_type(ep->desc)) { 98 case USB_ENDPOINT_XFER_CONTROL: 99 if (ep->udev->speed == USB_SPEED_HIGH) 100 /* uframes per NAK */ 101 interval = ep->desc->bInterval; 102 break; 103 104 case USB_ENDPOINT_XFER_ISOC: 105 interval = 1 << (ep->desc->bInterval - 1); 106 break; 107 108 case USB_ENDPOINT_XFER_BULK: 109 if (ep->udev->speed == USB_SPEED_HIGH && !in) 110 /* uframes per NAK */ 111 interval = ep->desc->bInterval; 112 break; 113 114 case USB_ENDPOINT_XFER_INT: 115 if (ep->udev->speed == USB_SPEED_HIGH) 116 interval = 1 << (ep->desc->bInterval - 1); 117 else 118 interval = ep->desc->bInterval; 119 break; 120 } 121 interval *= (ep->udev->speed == USB_SPEED_HIGH) ? 125 : 1000; 122 if (interval % 1000) 123 unit = 'u'; 124 else { 125 unit = 'm'; 126 interval /= 1000; 127 } 128 129 return sprintf(buf, "%d%cs\n", interval, unit); 130} 131static DEVICE_ATTR(interval, S_IRUGO, show_ep_interval, NULL); 132 133static ssize_t show_ep_direction(struct device *dev, 134 struct device_attribute *attr, char *buf) 135{ 136 struct ep_device *ep = to_ep_device(dev); 137 char *direction; 138 139 if (usb_endpoint_xfer_control(ep->desc)) 140 direction = "both"; 141 else if (usb_endpoint_dir_in(ep->desc)) 142 direction = "in"; 143 else 144 direction = "out"; 145 return sprintf(buf, "%s\n", direction); 146} 147static DEVICE_ATTR(direction, S_IRUGO, show_ep_direction, NULL); 148 149static struct attribute *ep_dev_attrs[] = { 150 &dev_attr_bLength.attr, 151 &dev_attr_bEndpointAddress.attr, 152 &dev_attr_bmAttributes.attr, 153 &dev_attr_bInterval.attr, 154 &dev_attr_wMaxPacketSize.attr, 155 &dev_attr_interval.attr, 156 &dev_attr_type.attr, 157 &dev_attr_direction.attr, 158 NULL, 159}; 160static struct attribute_group ep_dev_attr_grp = { 161 .attrs = ep_dev_attrs, 162}; 163static const struct attribute_group *ep_dev_groups[] = { 164 &ep_dev_attr_grp, 165 NULL 166}; 167 168static void ep_device_release(struct device *dev) 169{ 170 struct ep_device *ep_dev = to_ep_device(dev); 171 172 kfree(ep_dev); 173} 174 175int usb_create_ep_devs(struct device *parent, 176 struct usb_host_endpoint *endpoint, 177 struct usb_device *udev) 178{ 179 struct ep_device *ep_dev; 180 int retval; 181 182 ep_dev = kzalloc(sizeof(*ep_dev), GFP_KERNEL); 183 if (!ep_dev) { 184 retval = -ENOMEM; 185 goto exit; 186 } 187 188 ep_dev->desc = &endpoint->desc; 189 ep_dev->udev = udev; 190 ep_dev->dev.groups = ep_dev_groups; 191 ep_dev->dev.type = &usb_ep_device_type; 192 ep_dev->dev.parent = parent; 193 ep_dev->dev.release = ep_device_release; 194 dev_set_name(&ep_dev->dev, "ep_%02x", endpoint->desc.bEndpointAddress); 195 device_enable_async_suspend(&ep_dev->dev); 196 197 retval = device_register(&ep_dev->dev); 198 if (retval) 199 goto error_register; 200 201 endpoint->ep_dev = ep_dev; 202 return retval; 203 204error_register: 205 kfree(ep_dev); 206exit: 207 return retval; 208} 209 210void 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