text: /*
   * WUSB devices
   * sysfs bindings
   *
   * Copyright (C) 2007 Intel Corporation
   * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
   *
   * 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_WO(wusb_disconnect);
  
  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_RO(wusb_cdid);
  
  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);
  	memzero_explicit(&ck, sizeof(ck));
  	wusbhc_put(wusbhc);
  	return result < 0 ? result : size;
  }
  static DEVICE_ATTR_WO(wusb_ck);
  
  static struct attribute *wusb_dev_attrs[] = {
  		&dev_attr_wusb_disconnect.attr,
  		&dev_attr_wusb_cdid.attr,
  		&dev_attr_wusb_ck.attr,
  		NULL,
  };
  
  static const 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);
  }
  