1 // SPDX-License-Identifier: GPL-2.0+
4  * Copyright (C) 2015-2016 Samsung Electronics
22 /* called with udc->lock held */
26 	struct vep *ep0 = to_vep(udc->gadget.ep0);  in get_gadget_descs()
27 	struct usb_device_descriptor *ddesc = &udc->dev_desc;  in get_gadget_descs()
31 	if (!udc->driver || !udc->pullup)  in get_gadget_descs()
32 		return -EINVAL;  in get_gadget_descs()
40 	spin_unlock(&udc->lock);  in get_gadget_descs()
41 	ret = udc->driver->setup(&(udc->gadget), &req);  in get_gadget_descs()
42 	spin_lock(&udc->lock);  in get_gadget_descs()
47 	usb_req = list_last_entry(&ep0->req_queue, struct vrequest, req_entry);  in get_gadget_descs()
48 	list_del(&usb_req->req_entry);  in get_gadget_descs()
50 	if (usb_req->req.length > sizeof(*ddesc)) {  in get_gadget_descs()
51 		ret = -EOVERFLOW;  in get_gadget_descs()
55 	memcpy(ddesc, usb_req->req.buf, sizeof(*ddesc));  in get_gadget_descs()
56 	udc->desc_cached = 1;  in get_gadget_descs()
59 	usb_req->req.status = 0;  in get_gadget_descs()
60 	usb_req->req.actual = usb_req->req.length;  in get_gadget_descs()
61 	usb_gadget_giveback_request(&(ep0->ep), &(usb_req->req));  in get_gadget_descs()
75 	char *desc_ptr = (char *) &udc->dev_desc;  in dev_desc_read()
79 	spin_lock_irqsave(&udc->lock, flags);  in dev_desc_read()
80 	if (!udc->desc_cached) {  in dev_desc_read()
81 		ret = -ENODEV;  in dev_desc_read()
88 	spin_unlock_irqrestore(&udc->lock, flags);  in dev_desc_read()
109 		return -EINVAL;  in usbip_sockfd_store()
113 		return -ENODEV;  in usbip_sockfd_store()
115 	mutex_lock(&udc->ud.sysfs_lock);  in usbip_sockfd_store()
116 	spin_lock_irqsave(&udc->lock, flags);  in usbip_sockfd_store()
118 	if (!udc->driver || !udc->pullup) {  in usbip_sockfd_store()
120 		ret = -ENODEV;  in usbip_sockfd_store()
124 	if (sockfd != -1) {  in usbip_sockfd_store()
125 		if (udc->connected) {  in usbip_sockfd_store()
127 			ret = -EBUSY;  in usbip_sockfd_store()
131 		spin_lock(&udc->ud.lock);  in usbip_sockfd_store()
133 		if (udc->ud.status != SDEV_ST_AVAILABLE) {  in usbip_sockfd_store()
134 			ret = -EINVAL;  in usbip_sockfd_store()
141 			ret = -EINVAL;  in usbip_sockfd_store()
145 		if (socket->type != SOCK_STREAM) {  in usbip_sockfd_store()
146 			dev_err(dev, "Expecting SOCK_STREAM - found %d",  in usbip_sockfd_store()
147 				socket->type);  in usbip_sockfd_store()
148 			ret = -EINVAL;  in usbip_sockfd_store()
153 		spin_unlock(&udc->ud.lock);  in usbip_sockfd_store()
154 		spin_unlock_irqrestore(&udc->lock, flags);  in usbip_sockfd_store()
156 		tcp_rx = kthread_create(&v_rx_loop, &udc->ud, "vudc_rx");  in usbip_sockfd_store()
159 			mutex_unlock(&udc->ud.sysfs_lock);  in usbip_sockfd_store()
160 			return -EINVAL;  in usbip_sockfd_store()
162 		tcp_tx = kthread_create(&v_tx_loop, &udc->ud, "vudc_tx");  in usbip_sockfd_store()
166 			mutex_unlock(&udc->ud.sysfs_lock);  in usbip_sockfd_store()
167 			return -EINVAL;  in usbip_sockfd_store()
174 		/* lock and update udc->ud state */  in usbip_sockfd_store()
175 		spin_lock_irqsave(&udc->lock, flags);  in usbip_sockfd_store()
176 		spin_lock(&udc->ud.lock);  in usbip_sockfd_store()
178 		udc->ud.tcp_socket = socket;  in usbip_sockfd_store()
179 		udc->ud.tcp_rx = tcp_rx;  in usbip_sockfd_store()
180 		udc->ud.tcp_tx = tcp_tx;  in usbip_sockfd_store()
181 		udc->ud.status = SDEV_ST_USED;  in usbip_sockfd_store()
183 		spin_unlock(&udc->ud.lock);  in usbip_sockfd_store()
185 		ktime_get_ts64(&udc->start_time);  in usbip_sockfd_store()
187 		udc->connected = 1;  in usbip_sockfd_store()
189 		spin_unlock_irqrestore(&udc->lock, flags);  in usbip_sockfd_store()
191 		wake_up_process(udc->ud.tcp_rx);  in usbip_sockfd_store()
192 		wake_up_process(udc->ud.tcp_tx);  in usbip_sockfd_store()
194 		mutex_unlock(&udc->ud.sysfs_lock);  in usbip_sockfd_store()
198 		if (!udc->connected) {  in usbip_sockfd_store()
200 			ret = -EINVAL;  in usbip_sockfd_store()
204 		spin_lock(&udc->ud.lock);  in usbip_sockfd_store()
205 		if (udc->ud.status != SDEV_ST_USED) {  in usbip_sockfd_store()
206 			ret = -EINVAL;  in usbip_sockfd_store()
209 		spin_unlock(&udc->ud.lock);  in usbip_sockfd_store()
211 		usbip_event_add(&udc->ud, VUDC_EVENT_DOWN);  in usbip_sockfd_store()
214 	spin_unlock_irqrestore(&udc->lock, flags);  in usbip_sockfd_store()
215 	mutex_unlock(&udc->ud.sysfs_lock);  in usbip_sockfd_store()
222 	spin_unlock(&udc->ud.lock);  in usbip_sockfd_store()
224 	spin_unlock_irqrestore(&udc->lock, flags);  in usbip_sockfd_store()
225 	mutex_unlock(&udc->ud.sysfs_lock);  in usbip_sockfd_store()
235 	int status;  in usbip_status_show()  local
239 		return -ENODEV;  in usbip_status_show()
241 	spin_lock_irq(&udc->ud.lock);  in usbip_status_show()
242 	status = udc->ud.status;  in usbip_status_show()
243 	spin_unlock_irq(&udc->ud.lock);  in usbip_status_show()
245 	return sysfs_emit(out, "%d\n", status);  in usbip_status_show()