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wusb: add the USB wusb-cbaf driver
Add a driver for cable based associated of (Wireless) USB devices. Signed-off-by: David Vrabel <david.vrabel@csr.com>
This commit is contained in:
Inaky Perez-Gonzalez
David Vrabel
parent
470cc41503
commit
870d539504
@ -1,4 +1,4 @@
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obj-$(CONFIG_USB_WUSB) += wusbcore.o
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obj-$(CONFIG_USB_WUSB) += wusbcore.o wusb-cbaf.o
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wusbcore-objs := \
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crypto.o \
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@ -10,3 +10,5 @@ wusbcore-objs := \
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reservation.o \
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security.o \
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wusbhc.o
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wusb-cbaf-objs := cbaf.o
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620
drivers/usb/wusbcore/cbaf.c
Normal file
620
drivers/usb/wusbcore/cbaf.c
Normal file
@ -0,0 +1,620 @@
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/*
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* Wireless USB - Cable Based Association
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*
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*
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* Copyright (C) 2006 Intel Corporation
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* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*
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*
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* WUSB devices have to be paired (authenticated in WUSB lingo) so
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* that they can connect to the system.
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*
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* One way of pairing is using CBA-Cable Based Authentication, devices
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* that can connect via wired or wireless USB. First time you plug
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* them with a cable, pairing is done between host and device and
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* subsequent times, you can connect wirelessly without having to
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* pair. That's the idea.
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*
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* This driver does nothing Earth shattering. It just provides an
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* interface to chat with the wire-connected device so we can get a
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* CDID (device ID) that might have been previously associated to a
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* CHID (host ID) and to set up a new <CHID,CDID,CK> triplet
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* (connection context), with the CK being the secret, or connection
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* key. This is the pairing data.
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*
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* When a device with the CBA capability connects, the probe routine
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* just creates a bunch of sysfs files that a user space enumeration
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* manager uses to allow it to connect wirelessly to the system or not.
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*
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* The process goes like this:
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*
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* 1. device plugs, cbaf is loaded, notifications happen
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*
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* 2. the connection manager sees a device with CBAF capability (the
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* wusb_{host_info,cdid,cc} files are in /sys/device/blah/OURDEVICE).
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*
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* 3. CM (connection manager) writes the CHID (host ID) and a host
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* name into the wusb_host_info file. This gets sent to the device.
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*
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* 4. CM cats the wusb_cdid file; this asks the device if it has any
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* CDID associated to the CHDI we just wrote before. If it does, it
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* is printed, along with the device 'friendly name' and the band
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* groups the device supports.
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*
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* 5. CM looks up its database
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*
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* 5.1 If it has a matching CHID,CDID entry, the device has been
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* authorized before (paired). Now we can optionally ask the user
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* if he wants to allow the device to connect. Then we generate a
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* new CDID and CK, send it to the device and update the database
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* (writing to the wusb_cc file so they are uploaded to the device).
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*
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* 5.2 If the CDID is zero (or we didn't find a matching CDID in our
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* database), we assume the device is not known. We ask the user
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* if s/he wants to allow the device to be connected wirelessly
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* to the system. If nope, nothing else is done (FIXME: maybe
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* send a zero CDID to clean up our CHID?). If yes, we generate
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* random CDID and CKs (and write them to the wusb_cc file so
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* they are uploaded to the device).
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*
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* 6. device is unplugged
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*
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* When the device tries to connect wirelessly, it will present it's
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* CDID to the WUSB host controller with ID CHID, which will query the
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* database. If found, the host will (with a 4way handshake) challenge
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* the device to demonstrate it has the CK secret key (from our
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* database) without actually exchanging it. Once satisfied, crypto
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* keys are derived from the CK, the device is connected and all
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* communication is crypted.
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*
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*
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* NOTES ABOUT THE IMPLEMENTATION
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*
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* The descriptors sent back and forth use this horrible format from
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* hell on which each field is actually a field ID, field length and
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* then the field itself. How stupid can that get, taking into account
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* the structures are defined by the spec?? oh well.
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*
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*
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* FIXME: we don't provide a way to tell the device the pairing failed
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* (ie: send a CC_DATA_FAIL). Should add some day.
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*/
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#include <linux/module.h>
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#include <linux/ctype.h>
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#include <linux/version.h>
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#include <linux/usb.h>
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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#include <linux/random.h>
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#include <linux/mutex.h>
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#include <linux/uwb.h>
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#include <linux/usb/wusb.h>
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#include <linux/usb/association.h>
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#undef D_LOCAL
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#define D_LOCAL 6
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#include <linux/uwb/debug.h>
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/* An instance of a Cable-Based-Association-Framework device */
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struct cbaf {
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struct usb_device *usb_dev;
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struct usb_interface *usb_iface;
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void *buffer;
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size_t buffer_size;
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struct wusb_ckhdid chid;/* Host Information */
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char host_name[65]; /* max length:
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Assoc Models Suplement 1.0[T4-7] */
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u16 host_band_groups;
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struct wusb_ckhdid cdid;/* Device Information */
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char device_name[65]; /* max length:
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Assoc Models Suplement 1.0[T4-7] */
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u16 device_band_groups;
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struct wusb_ckhdid ck; /* Connection Key */
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};
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/*
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* Verify that a CBAF USB-interface has what we need
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*
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* (like we care, we are going to fail the enumeration if not :)
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*
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* FIXME: ugly function, need to split
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*/
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static int cbaf_check(struct cbaf *cbaf)
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{
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int result;
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struct device *dev = &cbaf->usb_iface->dev;
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struct wusb_cbaf_assoc_info *assoc_info;
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struct wusb_cbaf_assoc_request *assoc_request;
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size_t assoc_size;
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void *itr, *top;
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unsigned ar_index;
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int ar_rhi_idx = -1, ar_assoc_idx = -1;
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result = usb_control_msg(
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cbaf->usb_dev, usb_rcvctrlpipe(cbaf->usb_dev, 0),
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CBAF_REQ_GET_ASSOCIATION_INFORMATION,
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USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
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0, cbaf->usb_iface->cur_altsetting->desc.bInterfaceNumber,
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cbaf->buffer, cbaf->buffer_size, 1000 /* FIXME: arbitrary */);
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if (result < 0) {
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dev_err(dev, "cannot get available association types: %d\n",
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result);
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goto error_get_assoc_types;
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}
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assoc_info = cbaf->buffer;
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if (result < sizeof(*assoc_info)) {
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dev_err(dev, "not enough data to decode association info "
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"header (%zu vs %zu bytes required)\n",
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(size_t)result, sizeof(*assoc_info));
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goto error_bad_header;
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}
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assoc_size = le16_to_cpu(assoc_info->Length);
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if (result < assoc_size) {
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dev_err(dev, "not enough data to decode association info "
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"(%zu vs %zu bytes required)\n",
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(size_t)assoc_size, sizeof(*assoc_info));
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goto error_bad_data;
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}
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/*
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* From now on, we just verify, but won't error out unless we
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* don't find the AR_TYPE_WUSB_{RETRIEVE_HOST_INFO,ASSOCIATE}
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* types.
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*/
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ar_index = 0;
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itr = cbaf->buffer + sizeof(*assoc_info);
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top = cbaf->buffer + assoc_size;
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d_printf(1, dev, "Found %u association requests (%zu bytes)\n",
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assoc_info->NumAssociationRequests, assoc_size);
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while (itr < top) {
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u16 ar_type, ar_subtype;
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u32 ar_size;
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const char *ar_name;
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assoc_request = itr;
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if (top - itr < sizeof(*assoc_request)) {
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dev_err(dev, "not enough data to decode associaton "
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"request (%zu vs %zu bytes needed)\n",
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top - itr, sizeof(*assoc_request));
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break;
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}
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ar_type = le16_to_cpu(assoc_request->AssociationTypeId);
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ar_subtype = le16_to_cpu(assoc_request->AssociationSubTypeId);
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ar_size = le32_to_cpu(assoc_request->AssociationTypeInfoSize);
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switch (ar_type) {
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case AR_TYPE_WUSB:
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/* Verify we have what is mandated by AMS1.0 */
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switch (ar_subtype) {
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case AR_TYPE_WUSB_RETRIEVE_HOST_INFO:
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ar_name = "retrieve_host_info";
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ar_rhi_idx = ar_index;
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break;
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case AR_TYPE_WUSB_ASSOCIATE:
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/* send assoc data */
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ar_name = "associate";
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ar_assoc_idx = ar_index;
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break;
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default:
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ar_name = "unknown";
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};
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break;
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default:
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ar_name = "unknown";
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};
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d_printf(1, dev, "association request #%02u: 0x%04x/%04x "
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"(%zu bytes): %s\n",
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assoc_request->AssociationDataIndex, ar_type,
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ar_subtype, (size_t)ar_size, ar_name);
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itr += sizeof(*assoc_request);
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ar_index++;
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}
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if (ar_rhi_idx == -1) {
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dev_err(dev, "Missing RETRIEVE_HOST_INFO association "
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"request\n");
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goto error_bad_reqs;
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}
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if (ar_assoc_idx == -1) {
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dev_err(dev, "Missing ASSOCIATE association request\n");
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goto error_bad_reqs;
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}
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return 0;
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error_bad_header:
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error_bad_data:
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error_bad_reqs:
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error_get_assoc_types:
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return -EINVAL;
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}
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static const struct wusb_cbaf_host_info cbaf_host_info_defaults = {
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.AssociationTypeId_hdr = WUSB_AR_AssociationTypeId,
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.AssociationTypeId = cpu_to_le16(AR_TYPE_WUSB),
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.AssociationSubTypeId_hdr = WUSB_AR_AssociationSubTypeId,
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.AssociationSubTypeId = cpu_to_le16(AR_TYPE_WUSB_RETRIEVE_HOST_INFO),
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.CHID_hdr = WUSB_AR_CHID,
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.LangID_hdr = WUSB_AR_LangID,
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.HostFriendlyName_hdr = WUSB_AR_HostFriendlyName,
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};
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/* Send WUSB host information (CHID and name) to a CBAF device */
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static int cbaf_send_host_info(struct cbaf *cbaf)
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{
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struct wusb_cbaf_host_info *hi;
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size_t hi_size;
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hi = cbaf->buffer;
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memset(hi, 0, sizeof(*hi));
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*hi = cbaf_host_info_defaults;
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hi->CHID = cbaf->chid;
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hi->LangID = 0; /* FIXME: I guess... */
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strncpy(hi->HostFriendlyName, cbaf->host_name,
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hi->HostFriendlyName_hdr.len);
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hi->HostFriendlyName_hdr.len =
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cpu_to_le16(strlen(hi->HostFriendlyName));
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hi_size = sizeof(*hi) + strlen(hi->HostFriendlyName);
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return usb_control_msg(cbaf->usb_dev, usb_sndctrlpipe(cbaf->usb_dev, 0),
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CBAF_REQ_SET_ASSOCIATION_RESPONSE,
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USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
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0x0101,
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cbaf->usb_iface->cur_altsetting->desc.bInterfaceNumber,
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hi, hi_size, 1000 /* FIXME: arbitrary */);
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}
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/* Show current CHID info we have set from user space */
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static ssize_t cbaf_wusb_host_info_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct usb_interface *iface = to_usb_interface(dev);
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struct cbaf *cbaf = usb_get_intfdata(iface);
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char pr_chid[WUSB_CKHDID_STRSIZE];
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ckhdid_printf(pr_chid, sizeof(pr_chid), &cbaf->chid);
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return scnprintf(buf, PAGE_SIZE, "CHID: %s\nName: %s\n",
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pr_chid, cbaf->host_name);
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}
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/*
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* Get a host info CHID from user space and send it to the device.
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*
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* The user can recover a CC from the device associated to that CHID
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* by cat'ing wusb_connection_context.
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*/
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static ssize_t cbaf_wusb_host_info_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t size)
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{
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ssize_t result;
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struct usb_interface *iface = to_usb_interface(dev);
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struct cbaf *cbaf = usb_get_intfdata(iface);
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result = sscanf(buf,
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"%02hhx %02hhx %02hhx %02hhx "
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"%02hhx %02hhx %02hhx %02hhx "
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"%02hhx %02hhx %02hhx %02hhx "
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"%02hhx %02hhx %02hhx %02hhx "
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"%04hx %64s\n",
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&cbaf->chid.data[0] , &cbaf->chid.data[1],
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&cbaf->chid.data[2] , &cbaf->chid.data[3],
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&cbaf->chid.data[4] , &cbaf->chid.data[5],
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&cbaf->chid.data[6] , &cbaf->chid.data[7],
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&cbaf->chid.data[8] , &cbaf->chid.data[9],
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&cbaf->chid.data[10], &cbaf->chid.data[11],
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&cbaf->chid.data[12], &cbaf->chid.data[13],
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&cbaf->chid.data[14], &cbaf->chid.data[15],
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&cbaf->host_band_groups, cbaf->host_name);
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if (result != 18) {
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dev_err(dev, "Unrecognized CHID (need 16 8-bit hex digits, "
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"a 16 bit hex band group mask "
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"and a host name, got only %d)\n", (int)result);
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return -EINVAL;
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}
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result = cbaf_send_host_info(cbaf);
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if (result < 0)
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dev_err(dev, "Couldn't send host information to device: %d\n",
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(int)result);
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else
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d_printf(1, dev, "HI sent, wusb_cc can be read now\n");
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return result < 0 ? result : size;
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}
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static DEVICE_ATTR(wusb_host_info, 0600, cbaf_wusb_host_info_show,
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cbaf_wusb_host_info_store);
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static const struct wusb_cbaf_device_info cbaf_device_info_defaults = {
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.Length_hdr = WUSB_AR_Length,
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.CDID_hdr = WUSB_AR_CDID,
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.BandGroups_hdr = WUSB_AR_BandGroups,
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.LangID_hdr = WUSB_AR_LangID,
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.DeviceFriendlyName_hdr = WUSB_AR_DeviceFriendlyName,
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};
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/*
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* Get device's information (CDID) associated to CHID
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*
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* The device will return it's information (CDID, name, bandgroups)
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* associated to the CHID we have set before, or 0 CDID and default
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* name and bandgroup if no CHID set or unknown.
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*/
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static int cbaf_cdid_get(struct cbaf *cbaf)
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{
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int result;
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struct device *dev = &cbaf->usb_iface->dev;
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struct wusb_cbaf_device_info *di;
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size_t needed, dev_name_size;
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di = cbaf->buffer;
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result = usb_control_msg(
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cbaf->usb_dev, usb_rcvctrlpipe(cbaf->usb_dev, 0),
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CBAF_REQ_GET_ASSOCIATION_REQUEST,
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USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
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0x0200, cbaf->usb_iface->cur_altsetting->desc.bInterfaceNumber,
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di, cbaf->buffer_size, 1000 /* FIXME: arbitrary */);
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if (result < 0) {
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dev_err(dev, "Cannot request device information: %d\n", result);
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goto error_req_di;
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}
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needed = result < sizeof(*di) ? sizeof(*di) : le32_to_cpu(di->Length);
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if (result < needed) {
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dev_err(dev, "Not enough data in DEVICE_INFO reply (%zu vs "
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"%zu bytes needed)\n", (size_t)result, needed);
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goto error_bad_di;
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}
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cbaf->cdid = di->CDID;
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dev_name_size = le16_to_cpu(di->DeviceFriendlyName_hdr.len);
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dev_name_size = dev_name_size > 65 - 1 ? 65 - 1 : dev_name_size;
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memcpy(cbaf->device_name, di->DeviceFriendlyName, dev_name_size);
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cbaf->device_name[dev_name_size] = 0;
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cbaf->device_band_groups = le16_to_cpu(di->BandGroups);
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result = 0;
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error_req_di:
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error_bad_di:
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return result;
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}
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/*
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* Get device information and print it to sysfs
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*
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* See cbaf_cdid_get()
|
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*/
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static ssize_t cbaf_wusb_cdid_show(struct device *dev,
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struct device_attribute *attr, char *buf)
|
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{
|
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ssize_t result;
|
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struct usb_interface *iface = to_usb_interface(dev);
|
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struct cbaf *cbaf = usb_get_intfdata(iface);
|
||||
char pr_cdid[WUSB_CKHDID_STRSIZE];
|
||||
|
||||
result = cbaf_cdid_get(cbaf);
|
||||
if (result < 0) {
|
||||
dev_err(dev, "Cannot read device information: %d\n",
|
||||
(int)result);
|
||||
goto error_get_di;
|
||||
}
|
||||
ckhdid_printf(pr_cdid, sizeof(pr_cdid), &cbaf->cdid);
|
||||
result = scnprintf(buf, PAGE_SIZE,
|
||||
"CDID: %s\nName: %s\nBand_groups: 0x%04x\n",
|
||||
pr_cdid, cbaf->device_name,
|
||||
cbaf->device_band_groups);
|
||||
error_get_di:
|
||||
return result;
|
||||
}
|
||||
static DEVICE_ATTR(wusb_cdid, 0600, cbaf_wusb_cdid_show, NULL);
|
||||
|
||||
static const struct wusb_cbaf_cc_data cbaf_cc_data_defaults = {
|
||||
.AssociationTypeId_hdr = WUSB_AR_AssociationTypeId,
|
||||
.AssociationTypeId = cpu_to_le16(AR_TYPE_WUSB),
|
||||
.AssociationSubTypeId_hdr = WUSB_AR_AssociationSubTypeId,
|
||||
.AssociationSubTypeId = cpu_to_le16(AR_TYPE_WUSB_ASSOCIATE),
|
||||
.Length_hdr = WUSB_AR_Length,
|
||||
.Length = cpu_to_le32(sizeof(struct wusb_cbaf_cc_data)),
|
||||
.ConnectionContext_hdr = WUSB_AR_ConnectionContext,
|
||||
.BandGroups_hdr = WUSB_AR_BandGroups,
|
||||
};
|
||||
|
||||
static const struct wusb_cbaf_cc_data_fail cbaf_cc_data_fail_defaults = {
|
||||
.AssociationTypeId_hdr = WUSB_AR_AssociationTypeId,
|
||||
.AssociationSubTypeId_hdr = WUSB_AR_AssociationSubTypeId,
|
||||
.Length_hdr = WUSB_AR_Length,
|
||||
.AssociationStatus_hdr = WUSB_AR_AssociationStatus,
|
||||
};
|
||||
|
||||
/*
|
||||
* Send a new CC to the device
|
||||
*
|
||||
* So we update the CK and send the whole thing to the device
|
||||
*/
|
||||
static int cbaf_cc_upload(struct cbaf *cbaf)
|
||||
{
|
||||
int result;
|
||||
struct device *dev = &cbaf->usb_iface->dev;
|
||||
struct wusb_cbaf_cc_data *ccd;
|
||||
char pr_cdid[WUSB_CKHDID_STRSIZE];
|
||||
|
||||
ccd = cbaf->buffer;
|
||||
*ccd = cbaf_cc_data_defaults;
|
||||
ccd->CHID = cbaf->chid;
|
||||
ccd->CDID = cbaf->cdid;
|
||||
ccd->CK = cbaf->ck;
|
||||
ccd->BandGroups = cpu_to_le16(cbaf->host_band_groups);
|
||||
result = usb_control_msg(
|
||||
cbaf->usb_dev, usb_sndctrlpipe(cbaf->usb_dev, 0),
|
||||
CBAF_REQ_SET_ASSOCIATION_RESPONSE,
|
||||
USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
|
||||
0x0201, cbaf->usb_iface->cur_altsetting->desc.bInterfaceNumber,
|
||||
ccd, sizeof(*ccd), 1000 /* FIXME: arbitrary */);
|
||||
d_printf(1, dev, "Uploaded CC:\n");
|
||||
ckhdid_printf(pr_cdid, sizeof(pr_cdid), &ccd->CHID);
|
||||
d_printf(1, dev, " CHID %s\n", pr_cdid);
|
||||
ckhdid_printf(pr_cdid, sizeof(pr_cdid), &ccd->CDID);
|
||||
d_printf(1, dev, " CDID %s\n", pr_cdid);
|
||||
ckhdid_printf(pr_cdid, sizeof(pr_cdid), &ccd->CK);
|
||||
d_printf(1, dev, " CK %s\n", pr_cdid);
|
||||
d_printf(1, dev, " bandgroups 0x%04x\n", cbaf->host_band_groups);
|
||||
return result;
|
||||
}
|
||||
|
||||
/*
|
||||
* Send a new CC to the device
|
||||
*
|
||||
* We take the CDID and CK from user space, the rest from the info we
|
||||
* set with host_info.
|
||||
*/
|
||||
static ssize_t cbaf_wusb_cc_store(struct device *dev,
|
||||
struct device_attribute *attr,
|
||||
const char *buf, size_t size)
|
||||
{
|
||||
ssize_t result;
|
||||
struct usb_interface *iface = to_usb_interface(dev);
|
||||
struct cbaf *cbaf = usb_get_intfdata(iface);
|
||||
|
||||
result = sscanf(buf,
|
||||
"CDID: %02hhx %02hhx %02hhx %02hhx "
|
||||
"%02hhx %02hhx %02hhx %02hhx "
|
||||
"%02hhx %02hhx %02hhx %02hhx "
|
||||
"%02hhx %02hhx %02hhx %02hhx\n"
|
||||
"CK: %02hhx %02hhx %02hhx %02hhx "
|
||||
"%02hhx %02hhx %02hhx %02hhx "
|
||||
"%02hhx %02hhx %02hhx %02hhx "
|
||||
"%02hhx %02hhx %02hhx %02hhx\n",
|
||||
&cbaf->cdid.data[0] , &cbaf->cdid.data[1],
|
||||
&cbaf->cdid.data[2] , &cbaf->cdid.data[3],
|
||||
&cbaf->cdid.data[4] , &cbaf->cdid.data[5],
|
||||
&cbaf->cdid.data[6] , &cbaf->cdid.data[7],
|
||||
&cbaf->cdid.data[8] , &cbaf->cdid.data[9],
|
||||
&cbaf->cdid.data[10], &cbaf->cdid.data[11],
|
||||
&cbaf->cdid.data[12], &cbaf->cdid.data[13],
|
||||
&cbaf->cdid.data[14], &cbaf->cdid.data[15],
|
||||
|
||||
&cbaf->ck.data[0] , &cbaf->ck.data[1],
|
||||
&cbaf->ck.data[2] , &cbaf->ck.data[3],
|
||||
&cbaf->ck.data[4] , &cbaf->ck.data[5],
|
||||
&cbaf->ck.data[6] , &cbaf->ck.data[7],
|
||||
&cbaf->ck.data[8] , &cbaf->ck.data[9],
|
||||
&cbaf->ck.data[10], &cbaf->ck.data[11],
|
||||
&cbaf->ck.data[12], &cbaf->ck.data[13],
|
||||
&cbaf->ck.data[14], &cbaf->ck.data[15]);
|
||||
if (result != 32) {
|
||||
dev_err(dev, "Unrecognized CHID/CK (need 32 8-bit "
|
||||
"hex digits, got only %d)\n", (int)result);
|
||||
return -EINVAL;
|
||||
}
|
||||
result = cbaf_cc_upload(cbaf);
|
||||
if (result < 0)
|
||||
dev_err(dev, "Couldn't upload connection context: %d\n",
|
||||
(int)result);
|
||||
else
|
||||
d_printf(1, dev, "Connection context uploaded\n");
|
||||
return result < 0 ? result : size;
|
||||
}
|
||||
static DEVICE_ATTR(wusb_cc, 0600, NULL, cbaf_wusb_cc_store);
|
||||
|
||||
static struct attribute *cbaf_dev_attrs[] = {
|
||||
&dev_attr_wusb_host_info.attr,
|
||||
&dev_attr_wusb_cdid.attr,
|
||||
&dev_attr_wusb_cc.attr,
|
||||
NULL,
|
||||
};
|
||||
|
||||
static struct attribute_group cbaf_dev_attr_group = {
|
||||
.name = NULL, /* we want them in the same directory */
|
||||
.attrs = cbaf_dev_attrs,
|
||||
};
|
||||
|
||||
static int cbaf_probe(struct usb_interface *iface,
|
||||
const struct usb_device_id *id)
|
||||
{
|
||||
int result;
|
||||
struct cbaf *cbaf;
|
||||
struct device *dev = &iface->dev;
|
||||
|
||||
result = -ENOMEM;
|
||||
cbaf = kzalloc(sizeof(*cbaf), GFP_KERNEL);
|
||||
if (cbaf == NULL) {
|
||||
dev_err(dev, "Unable to allocate instance\n");
|
||||
goto error_kzalloc;
|
||||
}
|
||||
cbaf->buffer = kmalloc(512, GFP_KERNEL);
|
||||
if (cbaf->buffer == NULL)
|
||||
goto error_kmalloc_buffer;
|
||||
cbaf->buffer_size = 512;
|
||||
cbaf->usb_dev = usb_get_dev(interface_to_usbdev(iface));
|
||||
cbaf->usb_iface = usb_get_intf(iface);
|
||||
result = cbaf_check(cbaf);
|
||||
if (result < 0)
|
||||
goto error_check;
|
||||
result = sysfs_create_group(&dev->kobj, &cbaf_dev_attr_group);
|
||||
if (result < 0) {
|
||||
dev_err(dev, "Can't register sysfs attr group: %d\n", result);
|
||||
goto error_create_group;
|
||||
}
|
||||
usb_set_intfdata(iface, cbaf);
|
||||
d_printf(2, dev, "CBA attached\n");
|
||||
return 0;
|
||||
|
||||
error_create_group:
|
||||
error_check:
|
||||
kfree(cbaf->buffer);
|
||||
error_kmalloc_buffer:
|
||||
kfree(cbaf);
|
||||
error_kzalloc:
|
||||
return result;
|
||||
}
|
||||
|
||||
static void cbaf_disconnect(struct usb_interface *iface)
|
||||
{
|
||||
struct cbaf *cbaf = usb_get_intfdata(iface);
|
||||
struct device *dev = &iface->dev;
|
||||
sysfs_remove_group(&dev->kobj, &cbaf_dev_attr_group);
|
||||
usb_set_intfdata(iface, NULL);
|
||||
usb_put_intf(iface);
|
||||
kfree(cbaf->buffer);
|
||||
/* paranoia: clean up crypto keys */
|
||||
memset(cbaf, 0, sizeof(*cbaf));
|
||||
kfree(cbaf);
|
||||
d_printf(1, dev, "CBA detached\n");
|
||||
}
|
||||
|
||||
static struct usb_device_id cbaf_id_table[] = {
|
||||
{ USB_INTERFACE_INFO(0xef, 0x03, 0x01), },
|
||||
{ },
|
||||
};
|
||||
MODULE_DEVICE_TABLE(usb, cbaf_id_table);
|
||||
|
||||
static struct usb_driver cbaf_driver = {
|
||||
.name = "wusb-cbaf",
|
||||
.id_table = cbaf_id_table,
|
||||
.probe = cbaf_probe,
|
||||
.disconnect = cbaf_disconnect,
|
||||
};
|
||||
|
||||
static int __init cbaf_driver_init(void)
|
||||
{
|
||||
return usb_register(&cbaf_driver);
|
||||
}
|
||||
module_init(cbaf_driver_init);
|
||||
|
||||
static void __exit cbaf_driver_exit(void)
|
||||
{
|
||||
usb_deregister(&cbaf_driver);
|
||||
}
|
||||
module_exit(cbaf_driver_exit);
|
||||
|
||||
MODULE_AUTHOR("Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>");
|
||||
MODULE_DESCRIPTION("Wireless USB Cable Based Association");
|
||||
MODULE_LICENSE("GPL");
|
||||
Loading…
Reference in New Issue
Block a user