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21#include <linux/device.h>
22#include <linux/list.h>
23#include <linux/usb/gadget.h>
24#include <linux/usb/ch9.h>
25#include <linux/sysfs.h>
26#include <linux/kthread.h>
27#include <linux/byteorder/generic.h>
28
29#include "usbip_common.h"
30#include "vudc.h"
31
32#include <net/sock.h>
33
34
35int get_gadget_descs(struct vudc *udc)
36{
37 struct vrequest *usb_req;
38 struct vep *ep0 = to_vep(udc->gadget.ep0);
39 struct usb_device_descriptor *ddesc = &udc->dev_desc;
40 struct usb_ctrlrequest req;
41 int ret;
42
43 if (!udc->driver || !udc->pullup)
44 return -EINVAL;
45
46 req.bRequestType = USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE;
47 req.bRequest = USB_REQ_GET_DESCRIPTOR;
48 req.wValue = cpu_to_le16(USB_DT_DEVICE << 8);
49 req.wIndex = cpu_to_le16(0);
50 req.wLength = cpu_to_le16(sizeof(*ddesc));
51
52 spin_unlock(&udc->lock);
53 ret = udc->driver->setup(&(udc->gadget), &req);
54 spin_lock(&udc->lock);
55 if (ret < 0)
56 goto out;
57
58
59 usb_req = list_last_entry(&ep0->req_queue, struct vrequest, req_entry);
60 list_del(&usb_req->req_entry);
61
62 if (usb_req->req.length > sizeof(*ddesc)) {
63 ret = -EOVERFLOW;
64 goto giveback_req;
65 }
66
67 memcpy(ddesc, usb_req->req.buf, sizeof(*ddesc));
68 udc->desc_cached = 1;
69 ret = 0;
70giveback_req:
71 usb_req->req.status = 0;
72 usb_req->req.actual = usb_req->req.length;
73 usb_gadget_giveback_request(&(ep0->ep), &(usb_req->req));
74out:
75 return ret;
76}
77
78
79
80
81static ssize_t dev_desc_read(struct file *file, struct kobject *kobj,
82 struct bin_attribute *attr, char *out,
83 loff_t off, size_t count)
84{
85 struct device *dev = kobj_to_dev(kobj);
86 struct vudc *udc = (struct vudc *)dev_get_drvdata(dev);
87 char *desc_ptr = (char *) &udc->dev_desc;
88 unsigned long flags;
89 int ret;
90
91 spin_lock_irqsave(&udc->lock, flags);
92 if (!udc->desc_cached) {
93 ret = -ENODEV;
94 goto unlock;
95 }
96
97 memcpy(out, desc_ptr + off, count);
98 ret = count;
99unlock:
100 spin_unlock_irqrestore(&udc->lock, flags);
101 return ret;
102}
103static BIN_ATTR_RO(dev_desc, sizeof(struct usb_device_descriptor));
104
105static ssize_t store_sockfd(struct device *dev, struct device_attribute *attr,
106 const char *in, size_t count)
107{
108 struct vudc *udc = (struct vudc *) dev_get_drvdata(dev);
109 int rv;
110 int sockfd = 0;
111 int err;
112 struct socket *socket;
113 unsigned long flags;
114 int ret;
115
116 rv = kstrtoint(in, 0, &sockfd);
117 if (rv != 0)
118 return -EINVAL;
119
120 spin_lock_irqsave(&udc->lock, flags);
121
122 if (!udc || !udc->driver || !udc->pullup) {
123 dev_err(dev, "no device or gadget not bound");
124 ret = -ENODEV;
125 goto unlock;
126 }
127
128 if (sockfd != -1) {
129 if (udc->connected) {
130 dev_err(dev, "Device already connected");
131 ret = -EBUSY;
132 goto unlock;
133 }
134
135 spin_lock_irq(&udc->ud.lock);
136
137 if (udc->ud.status != SDEV_ST_AVAILABLE) {
138 ret = -EINVAL;
139 goto unlock_ud;
140 }
141
142 socket = sockfd_lookup(sockfd, &err);
143 if (!socket) {
144 dev_err(dev, "failed to lookup sock");
145 ret = -EINVAL;
146 goto unlock_ud;
147 }
148
149 udc->ud.tcp_socket = socket;
150
151 spin_unlock_irq(&udc->ud.lock);
152 spin_unlock_irqrestore(&udc->lock, flags);
153
154 udc->ud.tcp_rx = kthread_get_run(&v_rx_loop,
155 &udc->ud, "vudc_rx");
156 udc->ud.tcp_tx = kthread_get_run(&v_tx_loop,
157 &udc->ud, "vudc_tx");
158
159 spin_lock_irqsave(&udc->lock, flags);
160 spin_lock_irq(&udc->ud.lock);
161 udc->ud.status = SDEV_ST_USED;
162 spin_unlock_irq(&udc->ud.lock);
163
164 do_gettimeofday(&udc->start_time);
165 v_start_timer(udc);
166 udc->connected = 1;
167 } else {
168 if (!udc->connected) {
169 dev_err(dev, "Device not connected");
170 ret = -EINVAL;
171 goto unlock;
172 }
173
174 spin_lock_irq(&udc->ud.lock);
175 if (udc->ud.status != SDEV_ST_USED) {
176 ret = -EINVAL;
177 goto unlock_ud;
178 }
179 spin_unlock_irq(&udc->ud.lock);
180
181 usbip_event_add(&udc->ud, VUDC_EVENT_DOWN);
182 }
183
184 spin_unlock_irqrestore(&udc->lock, flags);
185
186 return count;
187
188unlock_ud:
189 spin_unlock_irq(&udc->ud.lock);
190unlock:
191 spin_unlock_irqrestore(&udc->lock, flags);
192
193 return ret;
194}
195static DEVICE_ATTR(usbip_sockfd, S_IWUSR, NULL, store_sockfd);
196
197static ssize_t usbip_status_show(struct device *dev,
198 struct device_attribute *attr, char *out)
199{
200 struct vudc *udc = (struct vudc *) dev_get_drvdata(dev);
201 int status;
202
203 if (!udc) {
204 dev_err(dev, "no device");
205 return -ENODEV;
206 }
207 spin_lock_irq(&udc->ud.lock);
208 status = udc->ud.status;
209 spin_unlock_irq(&udc->ud.lock);
210
211 return snprintf(out, PAGE_SIZE, "%d\n", status);
212}
213static DEVICE_ATTR_RO(usbip_status);
214
215static struct attribute *dev_attrs[] = {
216 &dev_attr_usbip_sockfd.attr,
217 &dev_attr_usbip_status.attr,
218 NULL,
219};
220
221static struct bin_attribute *dev_bin_attrs[] = {
222 &bin_attr_dev_desc,
223 NULL,
224};
225
226const struct attribute_group vudc_attr_group = {
227 .attrs = dev_attrs,
228 .bin_attrs = dev_bin_attrs,
229};
230
