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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 | // 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/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 sprintf(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 sprintf(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 sprintf(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 sprintf(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 sprintf(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); } 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(sizeof(*ep_dev), GFP_KERNEL); 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; } } |