[mirror_ubuntu-disco-kernel.git] / drivers / usb / usbip / vudc_sysfs.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2015 Karol Kosik <karo9@interia.eu>
 * Copyright (C) 2015-2016 Samsung Electronics
 *               Igor Kotrasinski <i.kotrasinsk@samsung.com>
 *               Krzysztof Opasiak <k.opasiak@samsung.com>
 */

#include <linux/device.h>
#include <linux/list.h>
#include <linux/usb/gadget.h>
#include <linux/usb/ch9.h>
#include <linux/sysfs.h>
#include <linux/kthread.h>
#include <linux/byteorder/generic.h>

#include "usbip_common.h"
#include "vudc.h"

#include <net/sock.h>

/* called with udc->lock held */
int get_gadget_descs(struct vudc *udc)
{
	struct vrequest *usb_req;
	struct vep *ep0 = to_vep(udc->gadget.ep0);
	struct usb_device_descriptor *ddesc = &udc->dev_desc;
	struct usb_ctrlrequest req;
	int ret;

	if (!udc->driver || !udc->pullup)
		return -EINVAL;

	req.bRequestType = USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE;
	req.bRequest = USB_REQ_GET_DESCRIPTOR;
	req.wValue = cpu_to_le16(USB_DT_DEVICE << 8);
	req.wIndex = cpu_to_le16(0);
	req.wLength = cpu_to_le16(sizeof(*ddesc));

	spin_unlock(&udc->lock);
	ret = udc->driver->setup(&(udc->gadget), &req);
	spin_lock(&udc->lock);
	if (ret < 0)
		goto out;

	/* assuming request queue is empty; request is now on top */
	usb_req = list_last_entry(&ep0->req_queue, struct vrequest, req_entry);
	list_del(&usb_req->req_entry);

	if (usb_req->req.length > sizeof(*ddesc)) {
		ret = -EOVERFLOW;
		goto giveback_req;
	}

	memcpy(ddesc, usb_req->req.buf, sizeof(*ddesc));
	udc->desc_cached = 1;
	ret = 0;
giveback_req:
	usb_req->req.status = 0;
	usb_req->req.actual = usb_req->req.length;
	usb_gadget_giveback_request(&(ep0->ep), &(usb_req->req));
out:
	return ret;
}

/*
 * Exposes device descriptor from the gadget driver.
 */
static ssize_t dev_desc_read(struct file *file, struct kobject *kobj,
			     struct bin_attribute *attr, char *out,
			     loff_t off, size_t count)
{
	struct device *dev = kobj_to_dev(kobj);
	struct vudc *udc = (struct vudc *)dev_get_drvdata(dev);
	char *desc_ptr = (char *) &udc->dev_desc;
	unsigned long flags;
	int ret;

	spin_lock_irqsave(&udc->lock, flags);
	if (!udc->desc_cached) {
		ret = -ENODEV;
		goto unlock;
	}

	memcpy(out, desc_ptr + off, count);
	ret = count;
unlock:
	spin_unlock_irqrestore(&udc->lock, flags);
	return ret;
}
static BIN_ATTR_RO(dev_desc, sizeof(struct usb_device_descriptor));

static ssize_t usbip_sockfd_store(struct device *dev, struct device_attribute *attr,
		     const char *in, size_t count)
{
	struct vudc *udc = (struct vudc *) dev_get_drvdata(dev);
	int rv;
	int sockfd = 0;
	int err;
	struct socket *socket;
	unsigned long flags;
	int ret;

	rv = kstrtoint(in, 0, &sockfd);
	if (rv != 0)
		return -EINVAL;

	spin_lock_irqsave(&udc->lock, flags);
	/* Don't export what we don't have */
	if (!udc || !udc->driver || !udc->pullup) {
		dev_err(dev, "no device or gadget not bound");
		ret = -ENODEV;
		goto unlock;
	}

	if (sockfd != -1) {
		if (udc->connected) {
			dev_err(dev, "Device already connected");
			ret = -EBUSY;
			goto unlock;
		}

		spin_lock_irq(&udc->ud.lock);

		if (udc->ud.status != SDEV_ST_AVAILABLE) {
			ret = -EINVAL;
			goto unlock_ud;
		}

		socket = sockfd_lookup(sockfd, &err);
		if (!socket) {
			dev_err(dev, "failed to lookup sock");
			ret = -EINVAL;
			goto unlock_ud;
		}

		udc->ud.tcp_socket = socket;

		spin_unlock_irq(&udc->ud.lock);
		spin_unlock_irqrestore(&udc->lock, flags);

		udc->ud.tcp_rx = kthread_get_run(&v_rx_loop,
						    &udc->ud, "vudc_rx");
		udc->ud.tcp_tx = kthread_get_run(&v_tx_loop,
						    &udc->ud, "vudc_tx");

		spin_lock_irqsave(&udc->lock, flags);
		spin_lock_irq(&udc->ud.lock);
		udc->ud.status = SDEV_ST_USED;
		spin_unlock_irq(&udc->ud.lock);

		ktime_get_ts64(&udc->start_time);
		v_start_timer(udc);
		udc->connected = 1;
	} else {
		if (!udc->connected) {
			dev_err(dev, "Device not connected");
			ret = -EINVAL;
			goto unlock;
		}

		spin_lock_irq(&udc->ud.lock);
		if (udc->ud.status != SDEV_ST_USED) {
			ret = -EINVAL;
			goto unlock_ud;
		}
		spin_unlock_irq(&udc->ud.lock);

		usbip_event_add(&udc->ud, VUDC_EVENT_DOWN);
	}

	spin_unlock_irqrestore(&udc->lock, flags);

	return count;

unlock_ud:
	spin_unlock_irq(&udc->ud.lock);
unlock:
	spin_unlock_irqrestore(&udc->lock, flags);

	return ret;
}
static DEVICE_ATTR_WO(usbip_sockfd);

static ssize_t usbip_status_show(struct device *dev,
			       struct device_attribute *attr, char *out)
{
	struct vudc *udc = (struct vudc *) dev_get_drvdata(dev);
	int status;

	if (!udc) {
		dev_err(dev, "no device");
		return -ENODEV;
	}
	spin_lock_irq(&udc->ud.lock);
	status = udc->ud.status;
	spin_unlock_irq(&udc->ud.lock);

	return snprintf(out, PAGE_SIZE, "%d\n", status);
}
static DEVICE_ATTR_RO(usbip_status);

static struct attribute *dev_attrs[] = {
	&dev_attr_usbip_sockfd.attr,
	&dev_attr_usbip_status.attr,
	NULL,
};

static struct bin_attribute *dev_bin_attrs[] = {
	&bin_attr_dev_desc,
	NULL,
};

const struct attribute_group vudc_attr_group = {
	.attrs = dev_attrs,
	.bin_attrs = dev_bin_attrs,
};
Commit	Line	Data
5fd54ace	1	// SPDX-License-Identifier: GPL-2.0+
ea6873a4 IK	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>
ea6873a4 IK	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
7c348f1c	31	if (!udc->driver \|\| !udc->pullup)
ea6873a4 IK	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	*/
2a7a10b8 IK	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)
ea6873a4	72	{
2a7a10b8	73	struct device *dev = kobj_to_dev(kobj);
ea6873a4	74	struct vudc udc = (struct vudc )dev_get_drvdata(dev);
2a7a10b8	75	char desc_ptr = (char ) &udc->dev_desc;
ea6873a4 IK	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
2a7a10b8 IK	85	memcpy(out, desc_ptr + off, count);
2a7a10b8 IK	86	ret = count;
ea6873a4 IK	87	unlock:
	88	spin_unlock_irqrestore(&udc->lock, flags);
	89	return ret;
	90	}
2a7a10b8	91	static BIN_ATTR_RO(dev_desc, sizeof(struct usb_device_descriptor));
ea6873a4	92
ca35910a	93	static ssize_t usbip_sockfd_store(struct device dev, struct device_attribute attr,
ea6873a4 IK	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	spin_lock_irqsave(&udc->lock, flags);
	109	/* Don't export what we don't have */
	110	if (!udc \|\| !udc->driver \|\| !udc->pullup) {
	111	dev_err(dev, "no device or gadget not bound");
	112	ret = -ENODEV;
	113	goto unlock;
	114	}
	115
	116	if (sockfd != -1) {
	117	if (udc->connected) {
	118	dev_err(dev, "Device already connected");
	119	ret = -EBUSY;
	120	goto unlock;
	121	}
	122
	123	spin_lock_irq(&udc->ud.lock);
	124
	125	if (udc->ud.status != SDEV_ST_AVAILABLE) {
	126	ret = -EINVAL;
	127	goto unlock_ud;
	128	}
	129
	130	socket = sockfd_lookup(sockfd, &err);
	131	if (!socket) {
	132	dev_err(dev, "failed to lookup sock");
	133	ret = -EINVAL;
	134	goto unlock_ud;
	135	}
	136
	137	udc->ud.tcp_socket = socket;
	138
	139	spin_unlock_irq(&udc->ud.lock);
	140	spin_unlock_irqrestore(&udc->lock, flags);
	141
	142	udc->ud.tcp_rx = kthread_get_run(&v_rx_loop,
	143	&udc->ud, "vudc_rx");
	144	udc->ud.tcp_tx = kthread_get_run(&v_tx_loop,
	145	&udc->ud, "vudc_tx");
	146
	147	spin_lock_irqsave(&udc->lock, flags);
	148	spin_lock_irq(&udc->ud.lock);
	149	udc->ud.status = SDEV_ST_USED;
	150	spin_unlock_irq(&udc->ud.lock);
	151
6c51441c	152	ktime_get_ts64(&udc->start_time);
ea6873a4 IK	153	v_start_timer(udc);
	154	udc->connected = 1;
	155	} else {
	156	if (!udc->connected) {
	157	dev_err(dev, "Device not connected");
	158	ret = -EINVAL;
	159	goto unlock;
	160	}
	161
	162	spin_lock_irq(&udc->ud.lock);
	163	if (udc->ud.status != SDEV_ST_USED) {
	164	ret = -EINVAL;
	165	goto unlock_ud;
	166	}
	167	spin_unlock_irq(&udc->ud.lock);
	168
	169	usbip_event_add(&udc->ud, VUDC_EVENT_DOWN);
	170	}
	171
	172	spin_unlock_irqrestore(&udc->lock, flags);
	173
	174	return count;
	175
	176	unlock_ud:
	177	spin_unlock_irq(&udc->ud.lock);
	178	unlock:
	179	spin_unlock_irqrestore(&udc->lock, flags);
	180
	181	return ret;
	182	}
ca35910a	183	static DEVICE_ATTR_WO(usbip_sockfd);
ea6873a4 IK	184
	185	static ssize_t usbip_status_show(struct device *dev,
	186	struct device_attribute attr, char out)
	187	{
	188	struct vudc udc = (struct vudc ) dev_get_drvdata(dev);
	189	int status;
	190
	191	if (!udc) {
442ee366	192	dev_err(dev, "no device");
ea6873a4 IK	193	return -ENODEV;
	194	}
	195	spin_lock_irq(&udc->ud.lock);
	196	status = udc->ud.status;
	197	spin_unlock_irq(&udc->ud.lock);
	198
	199	return snprintf(out, PAGE_SIZE, "%d\n", status);
	200	}
	201	static DEVICE_ATTR_RO(usbip_status);
	202
	203	static struct attribute *dev_attrs[] = {
ea6873a4 IK	204	&dev_attr_usbip_sockfd.attr,
	205	&dev_attr_usbip_status.attr,
	206	NULL,
	207	};
	208
2a7a10b8 IK	209	static struct bin_attribute *dev_bin_attrs[] = {
	210	&bin_attr_dev_desc,
	211	NULL,
	212	};
	213
ea6873a4 IK	214	const struct attribute_group vudc_attr_group = {
ea6873a4 IK	215	.attrs = dev_attrs,
2a7a10b8	216	.bin_attrs = dev_bin_attrs,
ea6873a4	217	};