drivers/usb/wusbcore/dev-sysfs.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * WUSB devices
   4  * sysfs bindings
   5  *
   6  * Copyright (C) 2007 Intel Corporation
   7  * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
   8  *
   9  * Get them out of the way...
  10  */
  11
  12 #include <linux/jiffies.h>
  13 #include <linux/ctype.h>
  14 #include <linux/workqueue.h>
  15 #include "wusbhc.h"
  16
  17 static ssize_t wusb_disconnect_store(struct device *dev,
  18                                      struct device_attribute *attr,
  19                                      const char *buf, size_t size)
  20 {
  21         struct usb_device *usb_dev;
  22         struct wusbhc *wusbhc;
  23         unsigned command;
  24         u8 port_idx;
  25
  26         if (sscanf(buf, "%u", &command) != 1)
  27                 return -EINVAL;
  28         if (command == 0)
  29                 return size;
  30         usb_dev = to_usb_device(dev);
  31         wusbhc = wusbhc_get_by_usb_dev(usb_dev);
  32         if (wusbhc == NULL)
  33                 return -ENODEV;
  34
  35         mutex_lock(&wusbhc->mutex);
  36         port_idx = wusb_port_no_to_idx(usb_dev->portnum);
  37         __wusbhc_dev_disable(wusbhc, port_idx);
  38         mutex_unlock(&wusbhc->mutex);
  39         wusbhc_put(wusbhc);
  40         return size;
  41 }
  42 static DEVICE_ATTR_WO(wusb_disconnect);
  43
  44 static ssize_t wusb_cdid_show(struct device *dev,
  45                               struct device_attribute *attr, char *buf)
  46 {
  47         ssize_t result;
  48         struct wusb_dev *wusb_dev;
  49
  50         wusb_dev = wusb_dev_get_by_usb_dev(to_usb_device(dev));
  51         if (wusb_dev == NULL)
  52                 return -ENODEV;
  53         result = ckhdid_printf(buf, PAGE_SIZE, &wusb_dev->cdid);
  54         strcat(buf, "\n");
  55         wusb_dev_put(wusb_dev);
  56         return result + 1;
  57 }
  58 static DEVICE_ATTR_RO(wusb_cdid);
  59
  60 static ssize_t wusb_ck_store(struct device *dev,
  61                              struct device_attribute *attr,
  62                              const char *buf, size_t size)
  63 {
  64         int result;
  65         struct usb_device *usb_dev;
  66         struct wusbhc *wusbhc;
  67         struct wusb_ckhdid ck;
  68
  69         result = sscanf(buf,
  70                         "%02hhx %02hhx %02hhx %02hhx "
  71                         "%02hhx %02hhx %02hhx %02hhx "
  72                         "%02hhx %02hhx %02hhx %02hhx "
  73                         "%02hhx %02hhx %02hhx %02hhx\n",
  74                         &ck.data[0] , &ck.data[1],
  75                         &ck.data[2] , &ck.data[3],
  76                         &ck.data[4] , &ck.data[5],
  77                         &ck.data[6] , &ck.data[7],
  78                         &ck.data[8] , &ck.data[9],
  79                         &ck.data[10], &ck.data[11],
  80                         &ck.data[12], &ck.data[13],
  81                         &ck.data[14], &ck.data[15]);
  82         if (result != 16)
  83                 return -EINVAL;
  84
  85         usb_dev = to_usb_device(dev);
  86         wusbhc = wusbhc_get_by_usb_dev(usb_dev);
  87         if (wusbhc == NULL)
  88                 return -ENODEV;
  89         result = wusb_dev_4way_handshake(wusbhc, usb_dev->wusb_dev, &ck);
  90         memzero_explicit(&ck, sizeof(ck));
  91         wusbhc_put(wusbhc);
  92         return result < 0 ? result : size;
  93 }
  94 static DEVICE_ATTR_WO(wusb_ck);
  95
  96 static struct attribute *wusb_dev_attrs[] = {
  97                 &dev_attr_wusb_disconnect.attr,
  98                 &dev_attr_wusb_cdid.attr,
  99                 &dev_attr_wusb_ck.attr,
 100                 NULL,
 101 };
 102
 103 static const struct attribute_group wusb_dev_attr_group = {
 104         .name = NULL,   /* we want them in the same directory */
 105         .attrs = wusb_dev_attrs,
 106 };
 107
 108 int wusb_dev_sysfs_add(struct wusbhc *wusbhc, struct usb_device *usb_dev,
 109                        struct wusb_dev *wusb_dev)
 110 {
 111         int result = sysfs_create_group(&usb_dev->dev.kobj,
 112                                         &wusb_dev_attr_group);
 113         struct device *dev = &usb_dev->dev;
 114         if (result < 0)
 115                 dev_err(dev, "Cannot register WUSB-dev attributes: %d\n",
 116                         result);
 117         return result;
 118 }
 119
 120 void wusb_dev_sysfs_rm(struct wusb_dev *wusb_dev)
 121 {
 122         struct usb_device *usb_dev = wusb_dev->usb_dev;
 123         if (usb_dev)
 124                 sysfs_remove_group(&usb_dev->dev.kobj, &wusb_dev_attr_group);
 125 }