/* * $Id: vhci_sysfs.c 15 2007-06-18 12:22:03Z hirofuchi $ * * Copyright (C) 2003-2007 Takahiro Hirofuchi * * * This is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, * USA. */#include "usbip_common.h"#include "vhci.h"/* TODO: refine locking ?*//*-------------------------------------------------------------------------*//* Sysfs entry to show port status */static ssize_t show_status(struct device *dev, struct device_attribute *attr,		char *out){	char *s = out;	int i = 0;	if (!the_controller || !out) {		if(!the_controller) 			err("'the_controller' is undefined");		if(!out)			err("'out' is undefined");		//BUG();		return -1;	}	spin_lock(&the_controller->lock);	/*	 * output example:	 * prt sta bus dev socket           local_busid	 * 000 004 000 000         c5a7bb80 1-2.3	 * 001 004 000 000         d8cee980 2-3.4	 *	 * IP address can be retrieved from a socket pointer address by looking	 * up /proc/net/{tcp,tcp6}. Also, a userland program may remember a	 * port number and its peer IP address.	 */	out += sprintf(out, "prt sta spd bus dev socket           local_busid\n");	for (i=0; i < VHCI_NPORTS; i++) {		struct vhci_device *vdev = port_to_vdev(i);		spin_lock(&vdev->ud.lock);		out += sprintf(out, "%03u %03u ", i, vdev->ud.status);		if (vdev->ud.status == VDEV_ST_USED) {			out += sprintf(out, "%03u %03u %03u ",					vdev->speed, vdev->busnum, vdev->devnum);			out += sprintf(out, "%16p ", vdev->ud.tcp_socket);			out += sprintf(out, "%s", vdev->udev->dev.bus_id);		} else			out += sprintf(out, "000 000 000 0000000000000000 0-0");		out += sprintf(out, "\n");		spin_unlock(&vdev->ud.lock);	}	spin_unlock(&the_controller->lock);	return out - s ;}static DEVICE_ATTR(status, S_IRUGO, show_status, NULL);/*-------------------------------------------------------------------------*//* Sysfs entry to shutdown a virtual connection */static int vhci_port_disconnect(__u32 rhport){	struct vhci_device *vdev;	dbg_vhci_sysfs("enter\n");	/* lock */	spin_lock(&the_controller->lock);	vdev = port_to_vdev(rhport);	spin_lock(&vdev->ud.lock);	if (vdev->ud.status == VDEV_ST_NULL) {		uerr("not connected %d\n", vdev->ud.status);		/* unlock */		spin_unlock(&vdev->ud.lock);		spin_unlock(&the_controller->lock);		return -EINVAL;	}	/* unlock */	spin_unlock(&vdev->ud.lock);	spin_unlock(&the_controller->lock);	usbip_event_add(&vdev->ud, VDEV_EVENT_DOWN);	return 0;}static ssize_t store_detach(struct device *dev, struct device_attribute *attr,		const char *buf, size_t count) {	int err;	__u32 rhport = 0;	sscanf(buf, "%u", &rhport);	/* check rhport */	if (rhport >= VHCI_NPORTS) {		uerr("invalid port %u\n", rhport);		return -EINVAL;	}	err = vhci_port_disconnect(rhport);	if (err < 0) {		return -EINVAL;	}	dbg_vhci_sysfs("Leave\n");	return count;}static DEVICE_ATTR(detach, S_IWUSR, NULL, store_detach);/*-------------------------------------------------------------------------*//* Sysfs entry to establish a virtual connection */static int valid_args(__u32 rhport, __u32 busnum, __u32 devnum,		enum usb_device_speed speed){	/* check rhport */	if ((rhport < 0) || (rhport >= VHCI_NPORTS)) {		uerr("port %u\n", rhport);		return -EINVAL;	}	/* check busnum & devnum */	if ((busnum <= 0) || (busnum >= 128) || (devnum <= 0) || (devnum >= 128)) {		uerr("busnum %u devnum %u\n", busnum, devnum);		return -EINVAL;	}	/* check speed */	switch(speed) {		case USB_SPEED_LOW:		case USB_SPEED_FULL:		case USB_SPEED_HIGH:		case USB_SPEED_VARIABLE:			break;		default:			uerr("speed %d\n", speed);			return -EINVAL;	}	return 0;}/* * To start a new USB/IP attachment, a userland program needs to setup a TCP * connection and then write its socket descriptor with remote device * information into this sysfs file. * * A remote device is virtually attached to the root-hub port of @rhport with * @speed. @busnum and @devnum are used to convert URBs between a client host * and a server host. * * write() returns 0 on success, else negative errno. */static ssize_t store_attach(struct device *dev, struct device_attribute *attr,		const char *buf, size_t count){	struct vhci_device *vdev;	struct socket *socket;	int sockfd = 0;	__u32 rhport=0, busnum=0, devnum=0, speed=0;	/*	 * @rhport: port number of vhci_hcd	 * @sockfd: socket descriptor of an established TCP connection	 * @busnum: usb bus number in a remote host	 * @devnum: usb device number in a remote host	 * @speed: usb device speed in a remote host	 */	sscanf(buf, "%u %u %u %u %u", &rhport, &sockfd, &busnum, &devnum, &speed);	dbg_vhci_sysfs("rhport(%u) sockfd(%u) busnum(%u) devnum(%u) speed(%u)\n",			rhport, sockfd, busnum, devnum, speed);	/* check received parameters */	if (valid_args(rhport, busnum, devnum, speed) < 0)		return -EINVAL;	/* check sockfd */	socket = sockfd_to_socket(sockfd);	if (!socket)		return  -EINVAL;#if 0	setnodelay(socket);#endif	/* now need lock until setting vdev status as used */	/* begin a lock */	spin_lock(&the_controller->lock);	vdev = port_to_vdev(rhport);	spin_lock(&vdev->ud.lock);	if (vdev->ud.status != VDEV_ST_NULL) {		/* end of the lock */		spin_unlock(&vdev->ud.lock);		spin_unlock(&the_controller->lock);		uerr("port %d already used\n", rhport);		return -EINVAL;	}	uinfo("rhport(%u) sockfd(%d) busnum(%u) devnum(%u) speed(%u)\n",			rhport, sockfd, busnum, devnum, speed);	vdev->busnum        = busnum;	vdev->devnum        = devnum;	vdev->speed         = speed;	vdev->ud.tcp_socket = socket;	vdev->ud.status     = VDEV_ST_NOTASSIGNED;	spin_unlock(&vdev->ud.lock);	spin_unlock(&the_controller->lock);	/* end the lock */	/*	 * this function will sleep, so should be out of the lock. but, it's ok	 * because we already marked vdev as being used. really?	 */	usbip_start_threads(&vdev->ud);	rh_port_connect(rhport, speed);	return count;}static DEVICE_ATTR(attach, S_IWUSR, NULL, store_attach);/*-------------------------------------------------------------------------*/static struct attribute *dev_attrs[] = {	&dev_attr_status.attr,	&dev_attr_detach.attr,	&dev_attr_attach.attr,	&dev_attr_usbip_debug.attr,	NULL,};struct attribute_group dev_attr_group = {	.attrs = dev_attrs,};