Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
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linux
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 = sprintf(buf, "%16ph\n", wusb_dev->cdid.data);
54 wusb_dev_put(wusb_dev);
55 return result;
56}
57static DEVICE_ATTR_RO(wusb_cdid);
58
59static ssize_t wusb_ck_store(struct device *dev,
60 struct device_attribute *attr,
61 const char *buf, size_t size)
62{
63 int result;
64 struct usb_device *usb_dev;
65 struct wusbhc *wusbhc;
66 struct wusb_ckhdid ck;
67
68 result = sscanf(buf,
69 "%02hhx %02hhx %02hhx %02hhx "
70 "%02hhx %02hhx %02hhx %02hhx "
71 "%02hhx %02hhx %02hhx %02hhx "
72 "%02hhx %02hhx %02hhx %02hhx\n",
73 &ck.data[0] , &ck.data[1],
74 &ck.data[2] , &ck.data[3],
75 &ck.data[4] , &ck.data[5],
76 &ck.data[6] , &ck.data[7],
77 &ck.data[8] , &ck.data[9],
78 &ck.data[10], &ck.data[11],
79 &ck.data[12], &ck.data[13],
80 &ck.data[14], &ck.data[15]);
81 if (result != 16)
82 return -EINVAL;
83
84 usb_dev = to_usb_device(dev);
85 wusbhc = wusbhc_get_by_usb_dev(usb_dev);
86 if (wusbhc == NULL)
87 return -ENODEV;
88 result = wusb_dev_4way_handshake(wusbhc, usb_dev->wusb_dev, &ck);
89 memzero_explicit(&ck, sizeof(ck));
90 wusbhc_put(wusbhc);
91 return result < 0 ? result : size;
92}
93static DEVICE_ATTR_WO(wusb_ck);
94
95static struct attribute *wusb_dev_attrs[] = {
96 &dev_attr_wusb_disconnect.attr,
97 &dev_attr_wusb_cdid.attr,
98 &dev_attr_wusb_ck.attr,
99 NULL,
100};
101
102static const struct attribute_group wusb_dev_attr_group = {
103 .name = NULL, /* we want them in the same directory */
104 .attrs = wusb_dev_attrs,
105};
106
107int wusb_dev_sysfs_add(struct wusbhc *wusbhc, struct usb_device *usb_dev,
108 struct wusb_dev *wusb_dev)
109{
110 int result = sysfs_create_group(&usb_dev->dev.kobj,
111 &wusb_dev_attr_group);
112 struct device *dev = &usb_dev->dev;
113 if (result < 0)
114 dev_err(dev, "Cannot register WUSB-dev attributes: %d\n",
115 result);
116 return result;
117}
118
119void wusb_dev_sysfs_rm(struct wusb_dev *wusb_dev)
120{
121 struct usb_device *usb_dev = wusb_dev->usb_dev;
122 if (usb_dev)
123 sysfs_remove_group(&usb_dev->dev.kobj, &wusb_dev_attr_group);
124}