1 files changed, 252 insertions, 0 deletions

diff --git a/drivers/usb/usbip/vhci_sysfs.c b/drivers/usb/usbip/vhci_sysfs.c
new file mode 100644
index 000000000000..211f43f67ea2
--- /dev/null
+++ b/drivers/usb/usbip/vhci_sysfs.c
@@ -0,0 +1,252 @@
+/*
+ * Copyright (C) 2003-2008 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 <linux/kthread.h>
+#include <linux/file.h>
+#include <linux/net.h>
+
+#include "usbip_common.h"
+#include "vhci.h"
+
+/* TODO: refine locking ?*/
+
+/* Sysfs entry to show port status */
+static ssize_t status_show(struct device *dev, struct device_attribute *attr,
+                           char *out)
+{
+        char *s = out;
+        int i = 0;
+
+        BUG_ON(!the_controller || !out);
+
+        spin_lock(&the_controller->lock);
+
+        /*
+         * output example:
+         * prt sta spd 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 %08x ",
+                                       vdev->speed, vdev->devid);
+                        out += sprintf(out, "%16p ", vdev->ud.tcp_socket);
+                        out += sprintf(out, "%s", dev_name(&vdev->udev->dev));
+
+                } 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_RO(status);
+
+/* Sysfs entry to shutdown a virtual connection */
+static int vhci_port_disconnect(__u32 rhport)
+{
+        struct vhci_device *vdev;
+
+        usbip_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) {
+                pr_err("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;
+
+        if (sscanf(buf, "%u", &rhport) != 1)
+                return -EINVAL;
+
+        /* check rhport */
+        if (rhport >= VHCI_NPORTS) {
+                dev_err(dev, "invalid port %u\n", rhport);
+                return -EINVAL;
+        }
+
+        err = vhci_port_disconnect(rhport);
+        if (err < 0)
+                return -EINVAL;
+
+        usbip_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, enum usb_device_speed speed)
+{
+        /* check rhport */
+        if (rhport >= VHCI_NPORTS) {
+                pr_err("port %u\n", rhport);
+                return -EINVAL;
+        }
+
+        /* check speed */
+        switch (speed) {
+        case USB_SPEED_LOW:
+        case USB_SPEED_FULL:
+        case USB_SPEED_HIGH:
+        case USB_SPEED_WIRELESS:
+                break;
+        default:
+                pr_err("Failed attach request for unsupported USB speed: %s\n",
+                        usb_speed_string(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. @devid is embedded into a request to specify the remote device in 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, devid = 0, speed = 0;
+        int err;
+
+        /*
+         * @rhport: port number of vhci_hcd
+         * @sockfd: socket descriptor of an established TCP connection
+         * @devid: unique device identifier in a remote host
+         * @speed: usb device speed in a remote host
+         */
+        if (sscanf(buf, "%u %u %u %u", &rhport, &sockfd, &devid, &speed) != 4)
+                return -EINVAL;
+
+        usbip_dbg_vhci_sysfs("rhport(%u) sockfd(%u) devid(%u) speed(%u)\n",
+                             rhport, sockfd, devid, speed);
+
+        /* check received parameters */
+        if (valid_args(rhport, speed) < 0)
+                return -EINVAL;
+
+        /* Extract socket from fd. */
+        socket = sockfd_lookup(sockfd, &err);
+        if (!socket)
+                return -EINVAL;
+
+        /* 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);
+
+                sockfd_put(socket);
+
+                dev_err(dev, "port %d already used\n", rhport);
+                return -EINVAL;
+        }
+
+        dev_info(dev,
+                 "rhport(%u) sockfd(%d) devid(%u) speed(%u) speed_str(%s)\n",
+                 rhport, sockfd, devid, speed, usb_speed_string(speed));
+
+        vdev->devid         = devid;
+        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 */
+
+        vdev->ud.tcp_rx = kthread_get_run(vhci_rx_loop, &vdev->ud, "vhci_rx");
+        vdev->ud.tcp_tx = kthread_get_run(vhci_tx_loop, &vdev->ud, "vhci_tx");
+
+        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,
+};
+
+const struct attribute_group dev_attr_group = {
+        .attrs = dev_attrs,
+};