LXR linux/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
  17static 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}
  42static DEVICE_ATTR_WO(wusb_disconnect);
  43
  44static 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}
  58static DEVICE_ATTR_RO(wusb_cdid);
  59
  60static 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}
  94static DEVICE_ATTR_WO(wusb_ck);
  95
  96static 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
 103static 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
 108int 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
 120void 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}
 126