uwb: add the WiMedia LLC Protocol stack

Add the generic code for the WiMedia Logical Link Control Protocol (WLP).

This has been split into several patches for easier review.

core (this patch):
  - everything else

messages:
  - WLP message construction/decode

wss:
  - Wireless Service Set support

build-system:
  - Kconfig and Kbuild files

Signed-off-by: David Vrabel <david.vrabel@csr.com>

1 files changed, 709 insertions, 0 deletions

diff --git a/drivers/uwb/wlp/sysfs.c b/drivers/uwb/wlp/sysfs.c
new file mode 100644
index 000000000000..1bb9b1f97d47
--- /dev/null
+++ b/drivers/uwb/wlp/sysfs.c
@@ -0,0 +1,709 @@
+/*
+ * WiMedia Logical Link Control Protocol (WLP)
+ * sysfs functions
+ *
+ * Copyright (C) 2007 Intel Corporation
+ * Reinette Chatre <reinette.chatre@intel.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version
+ * 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ *
+ *
+ * FIXME: Docs
+ *
+ */
+
+#include <linux/wlp.h>
+#include "wlp-internal.h"
+
+static
+size_t wlp_wss_wssid_e_print(char *buf, size_t bufsize,
+                             struct wlp_wssid_e *wssid_e)
+{
+        size_t used = 0;
+        used += scnprintf(buf, bufsize, " WSS: ");
+        used += wlp_wss_uuid_print(buf + used, bufsize - used,
+                                   &wssid_e->wssid);
+
+        if (wssid_e->info != NULL) {
+                used += scnprintf(buf + used, bufsize - used, " ");
+                used += uwb_mac_addr_print(buf + used, bufsize - used,
+                                           &wssid_e->info->bcast);
+                used += scnprintf(buf + used, bufsize - used, " %u %u %s\n",
+                                  wssid_e->info->accept_enroll,
+                                  wssid_e->info->sec_status,
+                                  wssid_e->info->name);
+        }
+        return used;
+}
+
+/**
+ * Print out information learned from neighbor discovery
+ *
+ * Some fields being printed may not be included in the device discovery
+ * information (it is not mandatory). We are thus careful how the
+ * information is printed to ensure it is clear to the user what field is
+ * being referenced.
+ * The information being printed is for one time use - temporary storage is
+ * cleaned after it is printed.
+ *
+ * Ideally sysfs output should be on one line. The information printed here
+ * contain a few strings so it will be hard to parse if they are all
+ * printed on the same line - without agreeing on a standard field
+ * separator.
+ */
+static
+ssize_t wlp_wss_neighborhood_print_remove(struct wlp *wlp, char *buf,
+                                   size_t bufsize)
+{
+        size_t used = 0;
+        struct wlp_neighbor_e *neighb;
+        struct wlp_wssid_e *wssid_e;
+
+        mutex_lock(&wlp->nbmutex);
+        used = scnprintf(buf, bufsize, "#Neighbor information\n"
+                         "#uuid dev_addr\n"
+                         "# Device Name:\n# Model Name:\n# Manufacturer:\n"
+                         "# Model Nr:\n# Serial:\n"
+                         "# Pri Dev type: CategoryID OUI OUISubdiv "
+                         "SubcategoryID\n"
+                         "# WSS: WSSID WSS_name accept_enroll sec_status "
+                         "bcast\n"
+                         "# WSS: WSSID WSS_name accept_enroll sec_status "
+                         "bcast\n\n");
+        list_for_each_entry(neighb, &wlp->neighbors, node) {
+                if (bufsize - used <= 0)
+                        goto out;
+                used += wlp_wss_uuid_print(buf + used, bufsize - used,
+                                           &neighb->uuid);
+                buf[used++] = ' ';
+                used += uwb_dev_addr_print(buf + used, bufsize - used,
+                                           &neighb->uwb_dev->dev_addr);
+                if (neighb->info != NULL)
+                        used += scnprintf(buf + used, bufsize - used,
+                                          "\n Device Name: %s\n"
+                                          " Model Name: %s\n"
+                                          " Manufacturer:%s \n"
+                                          " Model Nr: %s\n"
+                                          " Serial: %s\n"
+                                          " Pri Dev type: "
+                                          "%u %02x:%02x:%02x %u %u\n",
+                                          neighb->info->name,
+                                          neighb->info->model_name,
+                                          neighb->info->manufacturer,
+                                          neighb->info->model_nr,
+                                          neighb->info->serial,
+                                          neighb->info->prim_dev_type.category,
+                                          neighb->info->prim_dev_type.OUI[0],
+                                          neighb->info->prim_dev_type.OUI[1],
+                                          neighb->info->prim_dev_type.OUI[2],
+                                          neighb->info->prim_dev_type.OUIsubdiv,
+                                          neighb->info->prim_dev_type.subID);
+                list_for_each_entry(wssid_e, &neighb->wssid, node) {
+                        used += wlp_wss_wssid_e_print(buf + used,
+                                                      bufsize - used,
+                                                      wssid_e);
+                }
+                buf[used++] = '\n';
+                wlp_remove_neighbor_tmp_info(neighb);
+        }
+
+
+out:
+        mutex_unlock(&wlp->nbmutex);
+        return used;
+}
+
+
+/**
+ * Show properties of all WSS in neighborhood.
+ *
+ * Will trigger a complete discovery of WSS activated by this device and
+ * its neighbors.
+ */
+ssize_t wlp_neighborhood_show(struct wlp *wlp, char *buf)
+{
+        wlp_discover(wlp);
+        return wlp_wss_neighborhood_print_remove(wlp, buf, PAGE_SIZE);
+}
+EXPORT_SYMBOL_GPL(wlp_neighborhood_show);
+
+static
+ssize_t __wlp_wss_properties_show(struct wlp_wss *wss, char *buf,
+                                  size_t bufsize)
+{
+        ssize_t result;
+
+        result = wlp_wss_uuid_print(buf, bufsize, &wss->wssid);
+        result += scnprintf(buf + result, bufsize - result, " ");
+        result += uwb_mac_addr_print(buf + result, bufsize - result,
+                                     &wss->bcast);
+        result += scnprintf(buf + result, bufsize - result,
+                            " 0x%02x %u ", wss->hash, wss->secure_status);
+        result += wlp_wss_key_print(buf + result, bufsize - result,
+                                    wss->master_key);
+        result += scnprintf(buf + result, bufsize - result, " 0x%02x ",
+                            wss->tag);
+        result += uwb_mac_addr_print(buf + result, bufsize - result,
+                                     &wss->virtual_addr);
+        result += scnprintf(buf + result, bufsize - result, " %s", wss->name);
+        result += scnprintf(buf + result, bufsize - result,
+                            "\n\n#WSSID\n#WSS broadcast address\n"
+                            "#WSS hash\n#WSS secure status\n"
+                            "#WSS master key\n#WSS local tag\n"
+                            "#WSS local virtual EUI-48\n#WSS name\n");
+        return result;
+}
+
+/**
+ * Show which WSS is activated.
+ */
+ssize_t wlp_wss_activate_show(struct wlp_wss *wss, char *buf)
+{
+        int result = 0;
+
+        if (mutex_lock_interruptible(&wss->mutex))
+                goto out;
+        if (wss->state >= WLP_WSS_STATE_ACTIVE)
+                result = __wlp_wss_properties_show(wss, buf, PAGE_SIZE);
+        else
+                result = scnprintf(buf, PAGE_SIZE, "No local WSS active.\n");
+        result += scnprintf(buf + result, PAGE_SIZE - result,
+                        "\n\n"
+                        "# echo WSSID SECURE_STATUS ACCEPT_ENROLLMENT "
+                        "NAME #create new WSS\n"
+                        "# echo WSSID [DEV ADDR] #enroll in and activate "
+                        "existing WSS, can request registrar\n"
+                        "#\n"
+                        "# WSSID is a 16 byte hex array. Eg. 12 A3 3B ... \n"
+                        "# SECURE_STATUS 0 - unsecure, 1 - secure (default)\n"
+                        "# ACCEPT_ENROLLMENT 0 - no, 1 - yes (default)\n"
+                        "# NAME is the text string identifying the WSS\n"
+                        "# DEV ADDR is the device address of neighbor "
+                        "that should be registrar. Eg. 32:AB\n");
+
+        mutex_unlock(&wss->mutex);
+out:
+        return result;
+
+}
+EXPORT_SYMBOL_GPL(wlp_wss_activate_show);
+
+/**
+ * Create/activate a new WSS or enroll/activate in neighboring WSS
+ *
+ * The user can provide the WSSID of a WSS in which it wants to enroll.
+ * Only the WSSID is necessary if the WSS have been discovered before. If
+ * the WSS has not been discovered before, or the user wants to use a
+ * particular neighbor as its registrar, then the user can also provide a
+ * device address or the neighbor that will be used as registrar.
+ *
+ * A new WSS is created when the user provides a WSSID, secure status, and
+ * WSS name.
+ */
+ssize_t wlp_wss_activate_store(struct wlp_wss *wss,
+                               const char *buf, size_t size)
+{
+        ssize_t result = -EINVAL;
+        struct wlp_uuid wssid;
+        struct uwb_dev_addr dev;
+        struct uwb_dev_addr bcast = {.data = {0xff, 0xff} };
+        char name[65];
+        unsigned sec_status, accept;
+        memset(name, 0, sizeof(name));
+        result = sscanf(buf, "%02hhx %02hhx %02hhx %02hhx "
+                        "%02hhx %02hhx %02hhx %02hhx "
+                        "%02hhx %02hhx %02hhx %02hhx "
+                        "%02hhx %02hhx %02hhx %02hhx "
+                        "%02hhx:%02hhx",
+                        &wssid.data[0] , &wssid.data[1],
+                        &wssid.data[2] , &wssid.data[3],
+                        &wssid.data[4] , &wssid.data[5],
+                        &wssid.data[6] , &wssid.data[7],
+                        &wssid.data[8] , &wssid.data[9],
+                        &wssid.data[10], &wssid.data[11],
+                        &wssid.data[12], &wssid.data[13],
+                        &wssid.data[14], &wssid.data[15],
+                        &dev.data[1], &dev.data[0]);
+        if (result == 16 || result == 17) {
+                result = sscanf(buf, "%02hhx %02hhx %02hhx %02hhx "
+                                "%02hhx %02hhx %02hhx %02hhx "
+                                "%02hhx %02hhx %02hhx %02hhx "
+                                "%02hhx %02hhx %02hhx %02hhx "
+                                "%u %u %64c",
+                                &wssid.data[0] , &wssid.data[1],
+                                &wssid.data[2] , &wssid.data[3],
+                                &wssid.data[4] , &wssid.data[5],
+                                &wssid.data[6] , &wssid.data[7],
+                                &wssid.data[8] , &wssid.data[9],
+                                &wssid.data[10], &wssid.data[11],
+                                &wssid.data[12], &wssid.data[13],
+                                &wssid.data[14], &wssid.data[15],
+                                &sec_status, &accept, name);
+                if (result == 16)
+                        result = wlp_wss_enroll_activate(wss, &wssid, &bcast);
+                else if (result == 19) {
+                        sec_status = sec_status == 0 ? 0 : 1;
+                        accept = accept == 0 ? 0 : 1;
+                        /* We read name using %c, so the newline needs to be
+                         * removed */
+                        if (strlen(name) != sizeof(name) - 1)
+                                name[strlen(name) - 1] = '\0';
+                        result = wlp_wss_create_activate(wss, &wssid, name,
+                                                         sec_status, accept);
+                } else
+                        result = -EINVAL;
+        } else if (result == 18)
+                result = wlp_wss_enroll_activate(wss, &wssid, &dev);
+        else
+                result = -EINVAL;
+        return result < 0 ? result : size;
+}
+EXPORT_SYMBOL_GPL(wlp_wss_activate_store);
+
+/**
+ * Show the UUID of this host
+ */
+ssize_t wlp_uuid_show(struct wlp *wlp, char *buf)
+{
+        ssize_t result = 0;
+
+        mutex_lock(&wlp->mutex);
+        result = wlp_wss_uuid_print(buf, PAGE_SIZE, &wlp->uuid);
+        buf[result++] = '\n';
+        mutex_unlock(&wlp->mutex);
+        return result;
+}
+EXPORT_SYMBOL_GPL(wlp_uuid_show);
+
+/**
+ * Store a new UUID for this host
+ *
+ * According to the spec this should be encoded as an octet string in the
+ * order the octets are shown in string representation in RFC 4122 (WLP
+ * 0.99 [Table 6])
+ *
+ * We do not check value provided by user.
+ */
+ssize_t wlp_uuid_store(struct wlp *wlp, const char *buf, size_t size)
+{
+        ssize_t result;
+        struct wlp_uuid uuid;
+
+        mutex_lock(&wlp->mutex);
+        result = sscanf(buf, "%02hhx %02hhx %02hhx %02hhx "
+                        "%02hhx %02hhx %02hhx %02hhx "
+                        "%02hhx %02hhx %02hhx %02hhx "
+                        "%02hhx %02hhx %02hhx %02hhx ",
+                        &uuid.data[0] , &uuid.data[1],
+                        &uuid.data[2] , &uuid.data[3],
+                        &uuid.data[4] , &uuid.data[5],
+                        &uuid.data[6] , &uuid.data[7],
+                        &uuid.data[8] , &uuid.data[9],
+                        &uuid.data[10], &uuid.data[11],
+                        &uuid.data[12], &uuid.data[13],
+                        &uuid.data[14], &uuid.data[15]);
+        if (result != 16) {
+                result = -EINVAL;
+                goto error;
+        }
+        wlp->uuid = uuid;
+error:
+        mutex_unlock(&wlp->mutex);
+        return result < 0 ? result : size;
+}
+EXPORT_SYMBOL_GPL(wlp_uuid_store);
+
+/**
+ * Show contents of members of device information structure
+ */
+#define wlp_dev_info_show(type)                                         \
+ssize_t wlp_dev_##type##_show(struct wlp *wlp, char *buf)               \
+{                                                                       \
+        ssize_t result = 0;                                             \
+        mutex_lock(&wlp->mutex);                                        \
+        if (wlp->dev_info == NULL) {                                    \
+                result = __wlp_setup_device_info(wlp);                  \
+                if (result < 0)                                         \
+                        goto out;                                       \
+        }                                                               \
+        result = scnprintf(buf, PAGE_SIZE, "%s\n", wlp->dev_info->type);\
+out:                                                                    \
+        mutex_unlock(&wlp->mutex);                                      \
+        return result;                                                  \
+}                                                                       \
+EXPORT_SYMBOL_GPL(wlp_dev_##type##_show);
+
+wlp_dev_info_show(name)
+wlp_dev_info_show(model_name)
+wlp_dev_info_show(model_nr)
+wlp_dev_info_show(manufacturer)
+wlp_dev_info_show(serial)
+
+/**
+ * Store contents of members of device information structure
+ */
+#define wlp_dev_info_store(type, len)                                   \
+ssize_t wlp_dev_##type##_store(struct wlp *wlp, const char *buf, size_t size)\
+{                                                                       \
+        ssize_t result;                                                 \
+        char format[10];                                                \
+        mutex_lock(&wlp->mutex);                                        \
+        if (wlp->dev_info == NULL) {                                    \
+                result = __wlp_alloc_device_info(wlp);                  \
+                if (result < 0)                                         \
+                        goto out;                                       \
+        }                                                               \
+        memset(wlp->dev_info->type, 0, sizeof(wlp->dev_info->type));    \
+        sprintf(format, "%%%uc", len);                                  \
+        result = sscanf(buf, format, wlp->dev_info->type);              \
+out:                                                                    \
+        mutex_unlock(&wlp->mutex);                                      \
+        return result < 0 ? result : size;                              \
+}                                                                       \
+EXPORT_SYMBOL_GPL(wlp_dev_##type##_store);
+
+wlp_dev_info_store(name, 32)
+wlp_dev_info_store(manufacturer, 64)
+wlp_dev_info_store(model_name, 32)
+wlp_dev_info_store(model_nr, 32)
+wlp_dev_info_store(serial, 32)
+
+static
+const char *__wlp_dev_category[] = {
+        [WLP_DEV_CAT_COMPUTER] = "Computer",
+        [WLP_DEV_CAT_INPUT] = "Input device",
+        [WLP_DEV_CAT_PRINT_SCAN_FAX_COPIER] = "Printer, scanner, FAX, or "
+                                              "Copier",
+        [WLP_DEV_CAT_CAMERA] = "Camera",
+        [WLP_DEV_CAT_STORAGE] = "Storage Network",
+        [WLP_DEV_CAT_INFRASTRUCTURE] = "Infrastructure",
+        [WLP_DEV_CAT_DISPLAY] = "Display",
+        [WLP_DEV_CAT_MULTIM] = "Multimedia device",
+        [WLP_DEV_CAT_GAMING] = "Gaming device",
+        [WLP_DEV_CAT_TELEPHONE] = "Telephone",
+        [WLP_DEV_CAT_OTHER] = "Other",
+};
+
+static
+const char *wlp_dev_category_str(unsigned cat)
+{
+        if ((cat >= WLP_DEV_CAT_COMPUTER && cat <= WLP_DEV_CAT_TELEPHONE)
+            || cat == WLP_DEV_CAT_OTHER)
+                return __wlp_dev_category[cat];
+        return "unknown category";
+}
+
+ssize_t wlp_dev_prim_category_show(struct wlp *wlp, char *buf)
+{
+        ssize_t result = 0;
+        mutex_lock(&wlp->mutex);
+        if (wlp->dev_info == NULL) {
+                result = __wlp_setup_device_info(wlp);
+                if (result < 0)
+                        goto out;
+        }
+        result = scnprintf(buf, PAGE_SIZE, "%s\n",
+                  wlp_dev_category_str(wlp->dev_info->prim_dev_type.category));
+out:
+        mutex_unlock(&wlp->mutex);
+        return result;
+}
+EXPORT_SYMBOL_GPL(wlp_dev_prim_category_show);
+
+ssize_t wlp_dev_prim_category_store(struct wlp *wlp, const char *buf,
+                                    size_t size)
+{
+        ssize_t result;
+        u16 cat;
+        mutex_lock(&wlp->mutex);
+        if (wlp->dev_info == NULL) {
+                result = __wlp_alloc_device_info(wlp);
+                if (result < 0)
+                        goto out;
+        }
+        result = sscanf(buf, "%hu", &cat);
+        if ((cat >= WLP_DEV_CAT_COMPUTER && cat <= WLP_DEV_CAT_TELEPHONE)
+            || cat == WLP_DEV_CAT_OTHER)
+                wlp->dev_info->prim_dev_type.category = cat;
+        else
+                result = -EINVAL;
+out:
+        mutex_unlock(&wlp->mutex);
+        return result < 0 ? result : size;
+}
+EXPORT_SYMBOL_GPL(wlp_dev_prim_category_store);
+
+ssize_t wlp_dev_prim_OUI_show(struct wlp *wlp, char *buf)
+{
+        ssize_t result = 0;
+        mutex_lock(&wlp->mutex);
+        if (wlp->dev_info == NULL) {
+                result = __wlp_setup_device_info(wlp);
+                if (result < 0)
+                        goto out;
+        }
+        result = scnprintf(buf, PAGE_SIZE, "%02x:%02x:%02x\n",
+                           wlp->dev_info->prim_dev_type.OUI[0],
+                           wlp->dev_info->prim_dev_type.OUI[1],
+                           wlp->dev_info->prim_dev_type.OUI[2]);
+out:
+        mutex_unlock(&wlp->mutex);
+        return result;
+}
+EXPORT_SYMBOL_GPL(wlp_dev_prim_OUI_show);
+
+ssize_t wlp_dev_prim_OUI_store(struct wlp *wlp, const char *buf, size_t size)
+{
+        ssize_t result;
+        u8 OUI[3];
+        mutex_lock(&wlp->mutex);
+        if (wlp->dev_info == NULL) {
+                result = __wlp_alloc_device_info(wlp);
+                if (result < 0)
+                        goto out;
+        }
+        result = sscanf(buf, "%hhx:%hhx:%hhx",
+                        &OUI[0], &OUI[1], &OUI[2]);
+        if (result != 3) {
+                result = -EINVAL;
+                goto out;
+        } else
+                memcpy(wlp->dev_info->prim_dev_type.OUI, OUI, sizeof(OUI));
+out:
+        mutex_unlock(&wlp->mutex);
+        return result < 0 ? result : size;
+}
+EXPORT_SYMBOL_GPL(wlp_dev_prim_OUI_store);
+
+
+ssize_t wlp_dev_prim_OUI_sub_show(struct wlp *wlp, char *buf)
+{
+        ssize_t result = 0;
+        mutex_lock(&wlp->mutex);
+        if (wlp->dev_info == NULL) {
+                result = __wlp_setup_device_info(wlp);
+                if (result < 0)
+                        goto out;
+        }
+        result = scnprintf(buf, PAGE_SIZE, "%u\n",
+                           wlp->dev_info->prim_dev_type.OUIsubdiv);
+out:
+        mutex_unlock(&wlp->mutex);
+        return result;
+}
+EXPORT_SYMBOL_GPL(wlp_dev_prim_OUI_sub_show);
+
+ssize_t wlp_dev_prim_OUI_sub_store(struct wlp *wlp, const char *buf,
+                                   size_t size)
+{
+        ssize_t result;
+        unsigned sub;
+        u8 max_sub = ~0;
+        mutex_lock(&wlp->mutex);
+        if (wlp->dev_info == NULL) {
+                result = __wlp_alloc_device_info(wlp);
+                if (result < 0)
+                        goto out;
+        }
+        result = sscanf(buf, "%u", &sub);
+        if (sub <= max_sub)
+                wlp->dev_info->prim_dev_type.OUIsubdiv = sub;
+        else
+                result = -EINVAL;
+out:
+        mutex_unlock(&wlp->mutex);
+        return result < 0 ? result : size;
+}
+EXPORT_SYMBOL_GPL(wlp_dev_prim_OUI_sub_store);
+
+ssize_t wlp_dev_prim_subcat_show(struct wlp *wlp, char *buf)
+{
+        ssize_t result = 0;
+        mutex_lock(&wlp->mutex);
+        if (wlp->dev_info == NULL) {
+                result = __wlp_setup_device_info(wlp);
+                if (result < 0)
+                        goto out;
+        }
+        result = scnprintf(buf, PAGE_SIZE, "%u\n",
+                           wlp->dev_info->prim_dev_type.subID);
+out:
+        mutex_unlock(&wlp->mutex);
+        return result;
+}
+EXPORT_SYMBOL_GPL(wlp_dev_prim_subcat_show);
+
+ssize_t wlp_dev_prim_subcat_store(struct wlp *wlp, const char *buf,
+                                  size_t size)
+{
+        ssize_t result;
+        unsigned sub;
+        __le16 max_sub = ~0;
+        mutex_lock(&wlp->mutex);
+        if (wlp->dev_info == NULL) {
+                result = __wlp_alloc_device_info(wlp);
+                if (result < 0)
+                        goto out;
+        }
+        result = sscanf(buf, "%u", &sub);
+        if (sub <= max_sub)
+                wlp->dev_info->prim_dev_type.subID = sub;
+        else
+                result = -EINVAL;
+out:
+        mutex_unlock(&wlp->mutex);
+        return result < 0 ? result : size;
+}
+EXPORT_SYMBOL_GPL(wlp_dev_prim_subcat_store);
+
+/**
+ * Subsystem implementation for interaction with individual WSS via sysfs
+ *
+ * Followed instructions for subsystem in Documentation/filesystems/sysfs.txt
+ */
+
+#define kobj_to_wlp_wss(obj) container_of(obj, struct wlp_wss, kobj)
+#define attr_to_wlp_wss_attr(_attr) \
+        container_of(_attr, struct wlp_wss_attribute, attr)
+
+/**
+ * Sysfs subsystem: forward read calls
+ *
+ * Sysfs operation for forwarding read call to the show method of the
+ * attribute owner
+ */
+static
+ssize_t wlp_wss_attr_show(struct kobject *kobj, struct attribute *attr,
+                          char *buf)
+{
+        struct wlp_wss_attribute *wss_attr = attr_to_wlp_wss_attr(attr);
+        struct wlp_wss *wss = kobj_to_wlp_wss(kobj);
+        ssize_t ret = -EIO;
+
+        if (wss_attr->show)
+                ret = wss_attr->show(wss, buf);
+        return ret;
+}
+/**
+ * Sysfs subsystem: forward write calls
+ *
+ * Sysfs operation for forwarding write call to the store method of the
+ * attribute owner
+ */
+static
+ssize_t wlp_wss_attr_store(struct kobject *kobj, struct attribute *attr,
+                           const char *buf, size_t count)
+{
+        struct wlp_wss_attribute *wss_attr = attr_to_wlp_wss_attr(attr);
+        struct wlp_wss *wss = kobj_to_wlp_wss(kobj);
+        ssize_t ret = -EIO;
+
+        if (wss_attr->store)
+                ret = wss_attr->store(wss, buf, count);
+        return ret;
+}
+
+static
+struct sysfs_ops wss_sysfs_ops = {
+        .show   = wlp_wss_attr_show,
+        .store  = wlp_wss_attr_store,
+};
+
+struct kobj_type wss_ktype = {
+        .release        = wlp_wss_release,
+        .sysfs_ops      = &wss_sysfs_ops,
+};
+
+
+/**
+ * Sysfs files for individual WSS
+ */
+
+/**
+ * Print static properties of this WSS
+ *
+ * The name of a WSS may not be null teminated. It's max size is 64 bytes
+ * so we copy it to a larger array just to make sure we print sane data.
+ */
+static ssize_t wlp_wss_properties_show(struct wlp_wss *wss, char *buf)
+{
+        int result = 0;
+
+        if (mutex_lock_interruptible(&wss->mutex))
+                goto out;
+        result = __wlp_wss_properties_show(wss, buf, PAGE_SIZE);
+        mutex_unlock(&wss->mutex);
+out:
+        return result;
+}
+WSS_ATTR(properties, S_IRUGO, wlp_wss_properties_show, NULL);
+
+/**
+ * Print all connected members of this WSS
+ * The EDA cache contains all members of WSS neighborhood.
+ */
+static ssize_t wlp_wss_members_show(struct wlp_wss *wss, char *buf)
+{
+        struct wlp *wlp = container_of(wss, struct wlp, wss);
+        return wlp_eda_show(wlp, buf);
+}
+WSS_ATTR(members, S_IRUGO, wlp_wss_members_show, NULL);
+
+static
+const char *__wlp_strstate[] = {
+        "none",
+        "partially enrolled",
+        "enrolled",
+        "active",
+        "connected",
+};
+
+static const char *wlp_wss_strstate(unsigned state)
+{
+        if (state >= ARRAY_SIZE(__wlp_strstate))
+                return "unknown state";
+        return __wlp_strstate[state];
+}
+
+/*
+ * Print current state of this WSS
+ */
+static ssize_t wlp_wss_state_show(struct wlp_wss *wss, char *buf)
+{
+        int result = 0;
+
+        if (mutex_lock_interruptible(&wss->mutex))
+                goto out;
+        result = scnprintf(buf, PAGE_SIZE, "%s\n",
+                           wlp_wss_strstate(wss->state));
+        mutex_unlock(&wss->mutex);
+out:
+        return result;
+}
+WSS_ATTR(state, S_IRUGO, wlp_wss_state_show, NULL);
+
+
+static
+struct attribute *wss_attrs[] = {
+        &wss_attr_properties.attr,
+        &wss_attr_members.attr,
+        &wss_attr_state.attr,
+        NULL,
+};
+
+struct attribute_group wss_attr_group = {
+        .name = NULL,   /* we want them in the same directory */
+        .attrs = wss_attrs,
+};