drivers/usb/wusbcore/dev-sysfs.c

   1 /*
   2  * WUSB devices
   3  * sysfs bindings
   4  *
   5  * Copyright (C) 2007 Intel Corporation
   6  * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License version
  10  * 2 as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  20  * 02110-1301, USA.
  21  *
  22  *
  23  * Get them out of the way...
  24  */
  25
  26 #include <linux/jiffies.h>
  27 #include <linux/ctype.h>
  28 #include <linux/workqueue.h>
  29 #include "wusbhc.h"
  30
  31 static ssize_t wusb_disconnect_store(struct device *dev,
  32                                      struct device_attribute *attr,
  33                                      const char *buf, size_t size)
  34 {
  35         struct usb_device *usb_dev;
  36         struct wusbhc *wusbhc;
  37         unsigned command;
  38         u8 port_idx;
  39
  40         if (sscanf(buf, "%u", &command) != 1)
  41                 return -EINVAL;
  42         if (command == 0)
  43                 return size;
  44         usb_dev = to_usb_device(dev);
  45         wusbhc = wusbhc_get_by_usb_dev(usb_dev);
  46         if (wusbhc == NULL)
  47                 return -ENODEV;
  48
  49         mutex_lock(&wusbhc->mutex);
  50         port_idx = wusb_port_no_to_idx(usb_dev->portnum);
  51         __wusbhc_dev_disable(wusbhc, port_idx);
  52         mutex_unlock(&wusbhc->mutex);
  53         wusbhc_put(wusbhc);
  54         return size;
  55 }
  56 static DEVICE_ATTR(wusb_disconnect, 0200, NULL, wusb_disconnect_store);
  57
  58 static ssize_t wusb_cdid_show(struct device *dev,
  59                               struct device_attribute *attr, char *buf)
  60 {
  61         ssize_t result;
  62         struct wusb_dev *wusb_dev;
  63
  64         wusb_dev = wusb_dev_get_by_usb_dev(to_usb_device(dev));
  65         if (wusb_dev == NULL)
  66                 return -ENODEV;
  67         result = ckhdid_printf(buf, PAGE_SIZE, &wusb_dev->cdid);
  68         strcat(buf, "\n");
  69         wusb_dev_put(wusb_dev);
  70         return result + 1;
  71 }
  72 static DEVICE_ATTR(wusb_cdid, 0444, wusb_cdid_show, NULL);
  73
  74 static ssize_t wusb_ck_store(struct device *dev,
  75                              struct device_attribute *attr,
  76                              const char *buf, size_t size)
  77 {
  78         int result;
  79         struct usb_device *usb_dev;
  80         struct wusbhc *wusbhc;
  81         struct wusb_ckhdid ck;
  82
  83         result = sscanf(buf,
  84                         "%02hhx %02hhx %02hhx %02hhx "
  85                         "%02hhx %02hhx %02hhx %02hhx "
  86                         "%02hhx %02hhx %02hhx %02hhx "
  87                         "%02hhx %02hhx %02hhx %02hhx\n",
  88                         &ck.data[0] , &ck.data[1],
  89                         &ck.data[2] , &ck.data[3],
  90                         &ck.data[4] , &ck.data[5],
  91                         &ck.data[6] , &ck.data[7],
  92                         &ck.data[8] , &ck.data[9],
  93                         &ck.data[10], &ck.data[11],
  94                         &ck.data[12], &ck.data[13],
  95                         &ck.data[14], &ck.data[15]);
  96         if (result != 16)
  97                 return -EINVAL;
  98
  99         usb_dev = to_usb_device(dev);
 100         wusbhc = wusbhc_get_by_usb_dev(usb_dev);
 101         if (wusbhc == NULL)
 102                 return -ENODEV;
 103         result = wusb_dev_4way_handshake(wusbhc, usb_dev->wusb_dev, &ck);
 104         memzero_explicit(&ck, sizeof(ck));
 105         wusbhc_put(wusbhc);
 106         return result < 0 ? result : size;
 107 }
 108 static DEVICE_ATTR(wusb_ck, 0200, NULL, wusb_ck_store);
 109
 110 static struct attribute *wusb_dev_attrs[] = {
 111                 &dev_attr_wusb_disconnect.attr,
 112                 &dev_attr_wusb_cdid.attr,
 113                 &dev_attr_wusb_ck.attr,
 114                 NULL,
 115 };
 116
 117 static struct attribute_group wusb_dev_attr_group = {
 118         .name = NULL,   /* we want them in the same directory */
 119         .attrs = wusb_dev_attrs,
 120 };
 121
 122 int wusb_dev_sysfs_add(struct wusbhc *wusbhc, struct usb_device *usb_dev,
 123                        struct wusb_dev *wusb_dev)
 124 {
 125         int result = sysfs_create_group(&usb_dev->dev.kobj,
 126                                         &wusb_dev_attr_group);
 127         struct device *dev = &usb_dev->dev;
 128         if (result < 0)
 129                 dev_err(dev, "Cannot register WUSB-dev attributes: %d\n",
 130                         result);
 131         return result;
 132 }
 133
 134 void wusb_dev_sysfs_rm(struct wusb_dev *wusb_dev)
 135 {
 136         struct usb_device *usb_dev = wusb_dev->usb_dev;
 137         if (usb_dev)
 138                 sysfs_remove_group(&usb_dev->dev.kobj, &wusb_dev_attr_group);
 139 }