| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Wireless USB - Cable Based Association |
| * |
| * |
| * Copyright (C) 2006 Intel Corporation |
| * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com> |
| * Copyright (C) 2008 Cambridge Silicon Radio Ltd. |
| * |
| * WUSB devices have to be paired (associated in WUSB lingo) so |
| * that they can connect to the system. |
| * |
| * One way of pairing is using CBA-Cable Based Association. First |
| * time you plug the device with a cable, association is done between |
| * host and device and subsequent times, you can connect wirelessly |
| * without having to associate again. That's the idea. |
| * |
| * This driver does nothing Earth shattering. It just provides an |
| * interface to chat with the wire-connected device so we can get a |
| * CDID (device ID) that might have been previously associated to a |
| * CHID (host ID) and to set up a new <CHID,CDID,CK> triplet |
| * (connection context), with the CK being the secret, or connection |
| * key. This is the pairing data. |
| * |
| * When a device with the CBA capability connects, the probe routine |
| * just creates a bunch of sysfs files that a user space enumeration |
| * manager uses to allow it to connect wirelessly to the system or not. |
| * |
| * The process goes like this: |
| * |
| * 1. Device plugs, cbaf is loaded, notifications happen. |
| * |
| * 2. The connection manager (CM) sees a device with CBAF capability |
| * (the wusb_chid etc. files in /sys/devices/blah/OURDEVICE). |
| * |
| * 3. The CM writes the host name, supported band groups, and the CHID |
| * (host ID) into the wusb_host_name, wusb_host_band_groups and |
| * wusb_chid files. These get sent to the device and the CDID (if |
| * any) for this host is requested. |
| * |
| * 4. The CM can verify that the device's supported band groups |
| * (wusb_device_band_groups) are compatible with the host. |
| * |
| * 5. The CM reads the wusb_cdid file. |
| * |
| * 6. The CM looks up its database |
| * |
| * 6.1 If it has a matching CHID,CDID entry, the device has been |
| * authorized before (paired) and nothing further needs to be |
| * done. |
| * |
| * 6.2 If the CDID is zero (or the CM doesn't find a matching CDID in |
| * its database), the device is assumed to be not known. The CM |
| * may associate the host with device by: writing a randomly |
| * generated CDID to wusb_cdid and then a random CK to wusb_ck |
| * (this uploads the new CC to the device). |
| * |
| * CMD may choose to prompt the user before associating with a new |
| * device. |
| * |
| * 7. Device is unplugged. |
| * |
| * When the device tries to connect wirelessly, it will present its |
| * CDID to the WUSB host controller. The CM will query the |
| * database. If the CHID/CDID pair found, it will (with a 4-way |
| * handshake) challenge the device to demonstrate it has the CK secret |
| * key (from our database) without actually exchanging it. Once |
| * satisfied, crypto keys are derived from the CK, the device is |
| * connected and all communication is encrypted. |
| * |
| * References: |
| * [WUSB-AM] Association Models Supplement to the Certified Wireless |
| * Universal Serial Bus Specification, version 1.0. |
| */ |
| #include <linux/module.h> |
| #include <linux/ctype.h> |
| #include <linux/usb.h> |
| #include <linux/interrupt.h> |
| #include <linux/delay.h> |
| #include <linux/random.h> |
| #include <linux/slab.h> |
| #include <linux/mutex.h> |
| #include "../uwb/uwb.h" |
| #include "include/wusb.h" |
| #include "include/association.h" |
| |
| #define CBA_NAME_LEN 0x40 /* [WUSB-AM] table 4-7 */ |
| |
| /* An instance of a Cable-Based-Association-Framework device */ |
| struct cbaf { |
| struct usb_device *usb_dev; |
| struct usb_interface *usb_iface; |
| void *buffer; |
| size_t buffer_size; |
| |
| struct wusb_ckhdid chid; |
| char host_name[CBA_NAME_LEN]; |
| u16 host_band_groups; |
| |
| struct wusb_ckhdid cdid; |
| char device_name[CBA_NAME_LEN]; |
| u16 device_band_groups; |
| |
| struct wusb_ckhdid ck; |
| }; |
| |
| /* |
| * Verify that a CBAF USB-interface has what we need |
| * |
| * According to [WUSB-AM], CBA devices should provide at least two |
| * interfaces: |
| * - RETRIEVE_HOST_INFO |
| * - ASSOCIATE |
| * |
| * If the device doesn't provide these interfaces, we do not know how |
| * to deal with it. |
| */ |
| static int cbaf_check(struct cbaf *cbaf) |
| { |
| int result; |
| struct device *dev = &cbaf->usb_iface->dev; |
| struct wusb_cbaf_assoc_info *assoc_info; |
| struct wusb_cbaf_assoc_request *assoc_request; |
| size_t assoc_size; |
| void *itr, *top; |
| int ar_rhi = 0, ar_assoc = 0; |
| |
| result = usb_control_msg( |
| cbaf->usb_dev, usb_rcvctrlpipe(cbaf->usb_dev, 0), |
| CBAF_REQ_GET_ASSOCIATION_INFORMATION, |
| USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE, |
| 0, cbaf->usb_iface->cur_altsetting->desc.bInterfaceNumber, |
| cbaf->buffer, cbaf->buffer_size, USB_CTRL_GET_TIMEOUT); |
| if (result < 0) { |
| dev_err(dev, "Cannot get available association types: %d\n", |
| result); |
| return result; |
| } |
| |
| assoc_info = cbaf->buffer; |
| if (result < sizeof(*assoc_info)) { |
| dev_err(dev, "Not enough data to decode association info " |
| "header (%zu vs %zu bytes required)\n", |
| (size_t)result, sizeof(*assoc_info)); |
| return result; |
| } |
| |
| assoc_size = le16_to_cpu(assoc_info->Length); |
| if (result < assoc_size) { |
| dev_err(dev, "Not enough data to decode association info " |
| "(%zu vs %zu bytes required)\n", |
| (size_t)assoc_size, sizeof(*assoc_info)); |
| return result; |
| } |
| /* |
| * From now on, we just verify, but won't error out unless we |
| * don't find the AR_TYPE_WUSB_{RETRIEVE_HOST_INFO,ASSOCIATE} |
| * types. |
| */ |
| itr = cbaf->buffer + sizeof(*assoc_info); |
| top = cbaf->buffer + assoc_size; |
| dev_dbg(dev, "Found %u association requests (%zu bytes)\n", |
| assoc_info->NumAssociationRequests, assoc_size); |
| |
| while (itr < top) { |
| u16 ar_type, ar_subtype; |
| u32 ar_size; |
| const char *ar_name; |
| |
| assoc_request = itr; |
| |
| if (top - itr < sizeof(*assoc_request)) { |
| dev_err(dev, "Not enough data to decode association " |
| "request (%zu vs %zu bytes needed)\n", |
| top - itr, sizeof(*assoc_request)); |
| break; |
| } |
| |
| ar_type = le16_to_cpu(assoc_request->AssociationTypeId); |
| ar_subtype = le16_to_cpu(assoc_request->AssociationSubTypeId); |
| ar_size = le32_to_cpu(assoc_request->AssociationTypeInfoSize); |
| ar_name = "unknown"; |
| |
| switch (ar_type) { |
| case AR_TYPE_WUSB: |
| /* Verify we have what is mandated by [WUSB-AM]. */ |
| switch (ar_subtype) { |
| case AR_TYPE_WUSB_RETRIEVE_HOST_INFO: |
| ar_name = "RETRIEVE_HOST_INFO"; |
| ar_rhi = 1; |
| break; |
| case AR_TYPE_WUSB_ASSOCIATE: |
| /* send assoc data */ |
| ar_name = "ASSOCIATE"; |
| ar_assoc = 1; |
| break; |
| } |
| break; |
| } |
| |
| dev_dbg(dev, "Association request #%02u: 0x%04x/%04x " |
| "(%zu bytes): %s\n", |
| assoc_request->AssociationDataIndex, ar_type, |
| ar_subtype, (size_t)ar_size, ar_name); |
| |
| itr += sizeof(*assoc_request); |
| } |
| |
| if (!ar_rhi) { |
| dev_err(dev, "Missing RETRIEVE_HOST_INFO association " |
| "request\n"); |
| return -EINVAL; |
| } |
| if (!ar_assoc) { |
| dev_err(dev, "Missing ASSOCIATE association request\n"); |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static const struct wusb_cbaf_host_info cbaf_host_info_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_RETRIEVE_HOST_INFO), |
| .CHID_hdr = WUSB_AR_CHID, |
| .LangID_hdr = WUSB_AR_LangID, |
| .HostFriendlyName_hdr = WUSB_AR_HostFriendlyName, |
| }; |
| |
| /* Send WUSB host information (CHID and name) to a CBAF device */ |
| static int cbaf_send_host_info(struct cbaf *cbaf) |
| { |
| struct wusb_cbaf_host_info *hi; |
| size_t name_len; |
| size_t hi_size; |
| |
| hi = cbaf->buffer; |
| memset(hi, 0, sizeof(*hi)); |
| *hi = cbaf_host_info_defaults; |
| hi->CHID = cbaf->chid; |
| hi->LangID = 0; /* FIXME: I guess... */ |
| strlcpy(hi->HostFriendlyName, cbaf->host_name, CBA_NAME_LEN); |
| name_len = strlen(cbaf->host_name); |
| hi->HostFriendlyName_hdr.len = cpu_to_le16(name_len); |
| hi_size = sizeof(*hi) + name_len; |
| |
| return 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, |
| 0x0101, |
| cbaf->usb_iface->cur_altsetting->desc.bInterfaceNumber, |
| hi, hi_size, USB_CTRL_SET_TIMEOUT); |
| } |
| |
| /* |
| * Get device's information (CDID) associated to CHID |
| * |
| * The device will return it's information (CDID, name, bandgroups) |
| * associated to the CHID we have set before, or 0 CDID and default |
| * name and bandgroup if no CHID set or unknown. |
| */ |
| static int cbaf_cdid_get(struct cbaf *cbaf) |
| { |
| int result; |
| struct device *dev = &cbaf->usb_iface->dev; |
| struct wusb_cbaf_device_info *di; |
| size_t needed; |
| |
| di = cbaf->buffer; |
| result = usb_control_msg( |
| cbaf->usb_dev, usb_rcvctrlpipe(cbaf->usb_dev, 0), |
| CBAF_REQ_GET_ASSOCIATION_REQUEST, |
| USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE, |
| 0x0200, cbaf->usb_iface->cur_altsetting->desc.bInterfaceNumber, |
| di, cbaf->buffer_size, USB_CTRL_GET_TIMEOUT); |
| if (result < 0) { |
| dev_err(dev, "Cannot request device information: %d\n", |
| result); |
| return result; |
| } |
| |
| needed = result < sizeof(*di) ? sizeof(*di) : le32_to_cpu(di->Length); |
| if (result < needed) { |
| dev_err(dev, "Not enough data in DEVICE_INFO reply (%zu vs " |
| "%zu bytes needed)\n", (size_t)result, needed); |
| return -ENOENT; |
| } |
| |
| strlcpy(cbaf->device_name, di->DeviceFriendlyName, CBA_NAME_LEN); |
| cbaf->cdid = di->CDID; |
| cbaf->device_band_groups = le16_to_cpu(di->BandGroups); |
| |
| return 0; |
| } |
| |
| static ssize_t cbaf_wusb_chid_show(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct usb_interface *iface = to_usb_interface(dev); |
| struct cbaf *cbaf = usb_get_intfdata(iface); |
| |
| return sprintf(buf, "%16ph\n", cbaf->chid.data); |
| } |
| |
| static ssize_t cbaf_wusb_chid_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, |
| "%02hhx %02hhx %02hhx %02hhx " |
| "%02hhx %02hhx %02hhx %02hhx " |
| "%02hhx %02hhx %02hhx %02hhx " |
| "%02hhx %02hhx %02hhx %02hhx", |
| &cbaf->chid.data[0] , &cbaf->chid.data[1], |
| &cbaf->chid.data[2] , &cbaf->chid.data[3], |
| &cbaf->chid.data[4] , &cbaf->chid.data[5], |
| &cbaf->chid.data[6] , &cbaf->chid.data[7], |
| &cbaf->chid.data[8] , &cbaf->chid.data[9], |
| &cbaf->chid.data[10], &cbaf->chid.data[11], |
| &cbaf->chid.data[12], &cbaf->chid.data[13], |
| &cbaf->chid.data[14], &cbaf->chid.data[15]); |
| |
| if (result != 16) |
| return -EINVAL; |
| |
| result = cbaf_send_host_info(cbaf); |
| if (result < 0) |
| return result; |
| result = cbaf_cdid_get(cbaf); |
| if (result < 0) |
| return result; |
| return size; |
| } |
| static DEVICE_ATTR(wusb_chid, 0600, cbaf_wusb_chid_show, cbaf_wusb_chid_store); |
| |
| static ssize_t cbaf_wusb_host_name_show(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct usb_interface *iface = to_usb_interface(dev); |
| struct cbaf *cbaf = usb_get_intfdata(iface); |
| |
| return scnprintf(buf, PAGE_SIZE, "%s\n", cbaf->host_name); |
| } |
| |
| static ssize_t cbaf_wusb_host_name_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, "%63s", cbaf->host_name); |
| if (result != 1) |
| return -EINVAL; |
| |
| return size; |
| } |
| static DEVICE_ATTR(wusb_host_name, 0600, cbaf_wusb_host_name_show, |
| cbaf_wusb_host_name_store); |
| |
| static ssize_t cbaf_wusb_host_band_groups_show(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct usb_interface *iface = to_usb_interface(dev); |
| struct cbaf *cbaf = usb_get_intfdata(iface); |
| |
| return scnprintf(buf, PAGE_SIZE, "0x%04x\n", cbaf->host_band_groups); |
| } |
| |
| static ssize_t cbaf_wusb_host_band_groups_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); |
| u16 band_groups = 0; |
| |
| result = sscanf(buf, "%04hx", &band_groups); |
| if (result != 1) |
| return -EINVAL; |
| |
| cbaf->host_band_groups = band_groups; |
| |
| return size; |
| } |
| |
| static DEVICE_ATTR(wusb_host_band_groups, 0600, |
| cbaf_wusb_host_band_groups_show, |
| cbaf_wusb_host_band_groups_store); |
| |
| static const struct wusb_cbaf_device_info cbaf_device_info_defaults = { |
| .Length_hdr = WUSB_AR_Length, |
| .CDID_hdr = WUSB_AR_CDID, |
| .BandGroups_hdr = WUSB_AR_BandGroups, |
| .LangID_hdr = WUSB_AR_LangID, |
| .DeviceFriendlyName_hdr = WUSB_AR_DeviceFriendlyName, |
| }; |
| |
| static ssize_t cbaf_wusb_cdid_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct usb_interface *iface = to_usb_interface(dev); |
| struct cbaf *cbaf = usb_get_intfdata(iface); |
| |
| return sprintf(buf, "%16ph\n", cbaf->cdid.data); |
| } |
| |
| static ssize_t cbaf_wusb_cdid_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); |
| struct wusb_ckhdid cdid; |
| |
| result = sscanf(buf, |
| "%02hhx %02hhx %02hhx %02hhx " |
| "%02hhx %02hhx %02hhx %02hhx " |
| "%02hhx %02hhx %02hhx %02hhx " |
| "%02hhx %02hhx %02hhx %02hhx", |
| &cdid.data[0] , &cdid.data[1], |
| &cdid.data[2] , &cdid.data[3], |
| &cdid.data[4] , &cdid.data[5], |
| &cdid.data[6] , &cdid.data[7], |
| &cdid.data[8] , &cdid.data[9], |
| &cdid.data[10], &cdid.data[11], |
| &cdid.data[12], &cdid.data[13], |
| &cdid.data[14], &cdid.data[15]); |
| if (result != 16) |
| return -EINVAL; |
| |
| cbaf->cdid = cdid; |
| |
| return size; |
| } |
| static DEVICE_ATTR(wusb_cdid, 0600, cbaf_wusb_cdid_show, cbaf_wusb_cdid_store); |
| |
| static ssize_t cbaf_wusb_device_band_groups_show(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct usb_interface *iface = to_usb_interface(dev); |
| struct cbaf *cbaf = usb_get_intfdata(iface); |
| |
| return scnprintf(buf, PAGE_SIZE, "0x%04x\n", cbaf->device_band_groups); |
| } |
| |
| static DEVICE_ATTR(wusb_device_band_groups, 0600, |
| cbaf_wusb_device_band_groups_show, |
| NULL); |
| |
| static ssize_t cbaf_wusb_device_name_show(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct usb_interface *iface = to_usb_interface(dev); |
| struct cbaf *cbaf = usb_get_intfdata(iface); |
| |
| return scnprintf(buf, PAGE_SIZE, "%s\n", cbaf->device_name); |
| } |
| static DEVICE_ATTR(wusb_device_name, 0600, cbaf_wusb_device_name_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. |
| */ |
| static int cbaf_cc_upload(struct cbaf *cbaf) |
| { |
| int result; |
| struct device *dev = &cbaf->usb_iface->dev; |
| struct wusb_cbaf_cc_data *ccd; |
| |
| 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); |
| |
| dev_dbg(dev, "Trying to upload CC:\n"); |
| dev_dbg(dev, " CHID %16ph\n", ccd->CHID.data); |
| dev_dbg(dev, " CDID %16ph\n", ccd->CDID.data); |
| dev_dbg(dev, " Bandgroups 0x%04x\n", 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), USB_CTRL_SET_TIMEOUT); |
| |
| return result; |
| } |
| |
| static ssize_t cbaf_wusb_ck_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, |
| "%02hhx %02hhx %02hhx %02hhx " |
| "%02hhx %02hhx %02hhx %02hhx " |
| "%02hhx %02hhx %02hhx %02hhx " |
| "%02hhx %02hhx %02hhx %02hhx", |
| &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 != 16) |
| return -EINVAL; |
| |
| result = cbaf_cc_upload(cbaf); |
| if (result < 0) |
| return result; |
| |
| return size; |
| } |
| static DEVICE_ATTR(wusb_ck, 0600, NULL, cbaf_wusb_ck_store); |
| |
| static struct attribute *cbaf_dev_attrs[] = { |
| &dev_attr_wusb_host_name.attr, |
| &dev_attr_wusb_host_band_groups.attr, |
| &dev_attr_wusb_chid.attr, |
| &dev_attr_wusb_cdid.attr, |
| &dev_attr_wusb_device_name.attr, |
| &dev_attr_wusb_device_band_groups.attr, |
| &dev_attr_wusb_ck.attr, |
| NULL, |
| }; |
| |
| static const 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) |
| { |
| struct cbaf *cbaf; |
| struct device *dev = &iface->dev; |
| int result = -ENOMEM; |
| |
| cbaf = kzalloc(sizeof(*cbaf), GFP_KERNEL); |
| if (cbaf == NULL) |
| 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) { |
| dev_err(dev, "This device is not WUSB-CBAF compliant and is not supported yet.\n"); |
| 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); |
| return 0; |
| |
| error_create_group: |
| error_check: |
| usb_put_intf(iface); |
| usb_put_dev(cbaf->usb_dev); |
| 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); |
| usb_put_dev(cbaf->usb_dev); |
| kfree(cbaf->buffer); |
| /* paranoia: clean up crypto keys */ |
| kzfree(cbaf); |
| } |
| |
| static const 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, |
| }; |
| |
| module_usb_driver(cbaf_driver); |
| |
| MODULE_AUTHOR("Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>"); |
| MODULE_DESCRIPTION("Wireless USB Cable Based Association"); |
| MODULE_LICENSE("GPL"); |