1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (C) 2015 Karol Kosik <karo9@interia.eu> 4 * Copyright (C) 2015-2016 Samsung Electronics 5 * Igor Kotrasinski <i.kotrasinsk@samsung.com> 6 * Krzysztof Opasiak <k.opasiak@samsung.com> 7 */ 8 9 #include <linux/device.h> 10 #include <linux/list.h> 11 #include <linux/usb/gadget.h> 12 #include <linux/usb/ch9.h> 13 #include <linux/sysfs.h> 14 #include <linux/kthread.h> 15 #include <linux/byteorder/generic.h> 16 17 #include "usbip_common.h" 18 #include "vudc.h" 19 20 #include <net/sock.h> 21 22 /* called with udc->lock held */ 23 int get_gadget_descs(struct vudc *udc) 24 { 25 struct vrequest *usb_req; 26 struct vep *ep0 = to_vep(udc->gadget.ep0); 27 struct usb_device_descriptor *ddesc = &udc->dev_desc; 28 struct usb_ctrlrequest req; 29 int ret; 30 31 if (!udc->driver || !udc->pullup) 32 return -EINVAL; 33 34 req.bRequestType = USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE; 35 req.bRequest = USB_REQ_GET_DESCRIPTOR; 36 req.wValue = cpu_to_le16(USB_DT_DEVICE << 8); 37 req.wIndex = cpu_to_le16(0); 38 req.wLength = cpu_to_le16(sizeof(*ddesc)); 39 40 spin_unlock(&udc->lock); 41 ret = udc->driver->setup(&(udc->gadget), &req); 42 spin_lock(&udc->lock); 43 if (ret < 0) 44 goto out; 45 46 /* assuming request queue is empty; request is now on top */ 47 usb_req = list_last_entry(&ep0->req_queue, struct vrequest, req_entry); 48 list_del(&usb_req->req_entry); 49 50 if (usb_req->req.length > sizeof(*ddesc)) { 51 ret = -EOVERFLOW; 52 goto giveback_req; 53 } 54 55 memcpy(ddesc, usb_req->req.buf, sizeof(*ddesc)); 56 udc->desc_cached = 1; 57 ret = 0; 58 giveback_req: 59 usb_req->req.status = 0; 60 usb_req->req.actual = usb_req->req.length; 61 usb_gadget_giveback_request(&(ep0->ep), &(usb_req->req)); 62 out: 63 return ret; 64 } 65 66 /* 67 * Exposes device descriptor from the gadget driver. 68 */ 69 static ssize_t dev_desc_read(struct file *file, struct kobject *kobj, 70 struct bin_attribute *attr, char *out, 71 loff_t off, size_t count) 72 { 73 struct device *dev = kobj_to_dev(kobj); 74 struct vudc *udc = (struct vudc *)dev_get_drvdata(dev); 75 char *desc_ptr = (char *) &udc->dev_desc; 76 unsigned long flags; 77 int ret; 78 79 spin_lock_irqsave(&udc->lock, flags); 80 if (!udc->desc_cached) { 81 ret = -ENODEV; 82 goto unlock; 83 } 84 85 memcpy(out, desc_ptr + off, count); 86 ret = count; 87 unlock: 88 spin_unlock_irqrestore(&udc->lock, flags); 89 return ret; 90 } 91 static BIN_ATTR_RO(dev_desc, sizeof(struct usb_device_descriptor)); 92 93 static ssize_t usbip_sockfd_store(struct device *dev, struct device_attribute *attr, 94 const char *in, size_t count) 95 { 96 struct vudc *udc = (struct vudc *) dev_get_drvdata(dev); 97 int rv; 98 int sockfd = 0; 99 int err; 100 struct socket *socket; 101 unsigned long flags; 102 int ret; 103 104 rv = kstrtoint(in, 0, &sockfd); 105 if (rv != 0) 106 return -EINVAL; 107 108 if (!udc) { 109 dev_err(dev, "no device"); 110 return -ENODEV; 111 } 112 spin_lock_irqsave(&udc->lock, flags); 113 /* Don't export what we don't have */ 114 if (!udc->driver || !udc->pullup) { 115 dev_err(dev, "gadget not bound"); 116 ret = -ENODEV; 117 goto unlock; 118 } 119 120 if (sockfd != -1) { 121 if (udc->connected) { 122 dev_err(dev, "Device already connected"); 123 ret = -EBUSY; 124 goto unlock; 125 } 126 127 spin_lock_irq(&udc->ud.lock); 128 129 if (udc->ud.status != SDEV_ST_AVAILABLE) { 130 ret = -EINVAL; 131 goto unlock_ud; 132 } 133 134 socket = sockfd_lookup(sockfd, &err); 135 if (!socket) { 136 dev_err(dev, "failed to lookup sock"); 137 ret = -EINVAL; 138 goto unlock_ud; 139 } 140 141 udc->ud.tcp_socket = socket; 142 143 spin_unlock_irq(&udc->ud.lock); 144 spin_unlock_irqrestore(&udc->lock, flags); 145 146 udc->ud.tcp_rx = kthread_get_run(&v_rx_loop, 147 &udc->ud, "vudc_rx"); 148 udc->ud.tcp_tx = kthread_get_run(&v_tx_loop, 149 &udc->ud, "vudc_tx"); 150 151 spin_lock_irqsave(&udc->lock, flags); 152 spin_lock_irq(&udc->ud.lock); 153 udc->ud.status = SDEV_ST_USED; 154 spin_unlock_irq(&udc->ud.lock); 155 156 ktime_get_ts64(&udc->start_time); 157 v_start_timer(udc); 158 udc->connected = 1; 159 } else { 160 if (!udc->connected) { 161 dev_err(dev, "Device not connected"); 162 ret = -EINVAL; 163 goto unlock; 164 } 165 166 spin_lock_irq(&udc->ud.lock); 167 if (udc->ud.status != SDEV_ST_USED) { 168 ret = -EINVAL; 169 goto unlock_ud; 170 } 171 spin_unlock_irq(&udc->ud.lock); 172 173 usbip_event_add(&udc->ud, VUDC_EVENT_DOWN); 174 } 175 176 spin_unlock_irqrestore(&udc->lock, flags); 177 178 return count; 179 180 unlock_ud: 181 spin_unlock_irq(&udc->ud.lock); 182 unlock: 183 spin_unlock_irqrestore(&udc->lock, flags); 184 185 return ret; 186 } 187 static DEVICE_ATTR_WO(usbip_sockfd); 188 189 static ssize_t usbip_status_show(struct device *dev, 190 struct device_attribute *attr, char *out) 191 { 192 struct vudc *udc = (struct vudc *) dev_get_drvdata(dev); 193 int status; 194 195 if (!udc) { 196 dev_err(dev, "no device"); 197 return -ENODEV; 198 } 199 spin_lock_irq(&udc->ud.lock); 200 status = udc->ud.status; 201 spin_unlock_irq(&udc->ud.lock); 202 203 return snprintf(out, PAGE_SIZE, "%d\n", status); 204 } 205 static DEVICE_ATTR_RO(usbip_status); 206 207 static struct attribute *dev_attrs[] = { 208 &dev_attr_usbip_sockfd.attr, 209 &dev_attr_usbip_status.attr, 210 NULL, 211 }; 212 213 static struct bin_attribute *dev_bin_attrs[] = { 214 &bin_attr_dev_desc, 215 NULL, 216 }; 217 218 static const struct attribute_group vudc_attr_group = { 219 .attrs = dev_attrs, 220 .bin_attrs = dev_bin_attrs, 221 }; 222 223 const struct attribute_group *vudc_groups[] = { 224 &vudc_attr_group, 225 NULL, 226 }; 227