dev-sysfs.c

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/*
 * WUSB devices
 * sysfs bindings
 *
 * Copyright (C) 2007 Intel Corporation
 * Inaky Perez-Gonzalez <[email protected]>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version
 * 2 as published by the Free Software Foundation.
 *
 * This program 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., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 *
 *
 * Get them out of the way...
 */

#include <linux/jiffies.h>
#include <linux/ctype.h>
#include <linux/workqueue.h>
#include "wusbhc.h"

static ssize_t wusb_disconnect_store(struct device *dev,
                     struct device_attribute *attr,
                     const char *buf, size_t size)
{
    struct usb_device *usb_dev;
    struct wusbhc *wusbhc;
    unsigned command;
    u8 port_idx;

    if (sscanf(buf, "%u", &command) != 1)
        return -EINVAL;
    if (command == 0)
        return size;
    usb_dev = to_usb_device(dev);
    wusbhc = wusbhc_get_by_usb_dev(usb_dev);
    if (wusbhc == NULL)
        return -ENODEV;

    mutex_lock(&wusbhc->mutex);
    port_idx = wusb_port_no_to_idx(usb_dev->portnum);
    __wusbhc_dev_disable(wusbhc, port_idx);
    mutex_unlock(&wusbhc->mutex);
    wusbhc_put(wusbhc);
    return size;
}
static DEVICE_ATTR(wusb_disconnect, 0200, NULL, wusb_disconnect_store);

static ssize_t wusb_cdid_show(struct device *dev,
                  struct device_attribute *attr, char *buf)
{
    ssize_t result;
    struct wusb_dev *wusb_dev;

    wusb_dev = wusb_dev_get_by_usb_dev(to_usb_device(dev));
    if (wusb_dev == NULL)
        return -ENODEV;
    result = ckhdid_printf(buf, PAGE_SIZE, &wusb_dev->cdid);
    strcat(buf, "\n");
    wusb_dev_put(wusb_dev);
    return result + 1;
}
static DEVICE_ATTR(wusb_cdid, 0444, wusb_cdid_show, NULL);

static ssize_t wusb_ck_store(struct device *dev,
                 struct device_attribute *attr,
                 const char *buf, size_t size)
{
    int result;
    struct usb_device *usb_dev;
    struct wusbhc *wusbhc;
    struct wusb_ckhdid ck;

    result = sscanf(buf,
            "%02hhx %02hhx %02hhx %02hhx "
            "%02hhx %02hhx %02hhx %02hhx "
            "%02hhx %02hhx %02hhx %02hhx "
            "%02hhx %02hhx %02hhx %02hhx\n",
            &ck.data[0] , &ck.data[1],
            &ck.data[2] , &ck.data[3],
            &ck.data[4] , &ck.data[5],
            &ck.data[6] , &ck.data[7],
            &ck.data[8] , &ck.data[9],
            &ck.data[10], &ck.data[11],
            &ck.data[12], &ck.data[13],
            &ck.data[14], &ck.data[15]);
    if (result != 16)
        return -EINVAL;

    usb_dev = to_usb_device(dev);
    wusbhc = wusbhc_get_by_usb_dev(usb_dev);
    if (wusbhc == NULL)
        return -ENODEV;
    result = wusb_dev_4way_handshake(wusbhc, usb_dev->wusb_dev, &ck);
    memset(&ck, 0, sizeof(ck));
    wusbhc_put(wusbhc);
    return result < 0 ? result : size;
}
static DEVICE_ATTR(wusb_ck, 0200, NULL, wusb_ck_store);

static struct attribute *wusb_dev_attrs[] = {
        &dev_attr_wusb_disconnect.attr,
        &dev_attr_wusb_cdid.attr,
        &dev_attr_wusb_ck.attr,
        NULL,
};

static struct attribute_group wusb_dev_attr_group = {
    .name = NULL,   /* we want them in the same directory */
    .attrs = wusb_dev_attrs,
};

int wusb_dev_sysfs_add(struct wusbhc *wusbhc, struct usb_device *usb_dev,
               struct wusb_dev *wusb_dev)
{
    int result = sysfs_create_group(&usb_dev->dev.kobj,
                    &wusb_dev_attr_group);
    struct device *dev = &usb_dev->dev;
    if (result < 0)
        dev_err(dev, "Cannot register WUSB-dev attributes: %d\n",
            result);
    return result;
}

void wusb_dev_sysfs_rm(struct wusb_dev *wusb_dev)
{
    struct usb_device *usb_dev = wusb_dev->usb_dev;
    if (usb_dev)
        sysfs_remove_group(&usb_dev->dev.kobj, &wusb_dev_attr_group);
}