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/drivers/usb/wusbcore/dev-sysfs.c

https://bitbucket.org/cyanogenmod/android_kernel_asus_tf300t
C | 139 lines | 102 code | 13 blank | 24 comment | 14 complexity | c896044cf565a0638e65f6f365f7084e MD5 | raw file
Possible License(s): LGPL-2.0, AGPL-1.0, GPL-2.0
  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
 31static 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}
 56static DEVICE_ATTR(wusb_disconnect, 0200, NULL, wusb_disconnect_store);
 57
 58static 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}
 72static DEVICE_ATTR(wusb_cdid, 0444, wusb_cdid_show, NULL);
 73
 74static 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	memset(&ck, 0, sizeof(ck));
105	wusbhc_put(wusbhc);
106	return result < 0 ? result : size;
107}
108static DEVICE_ATTR(wusb_ck, 0200, NULL, wusb_ck_store);
109
110static 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
117static struct attribute_group wusb_dev_attr_group = {
118	.name = NULL,	/* we want them in the same directory */
119	.attrs = wusb_dev_attrs,
120};
121
122int 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
134void 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}