LXR linux/drivers/net/wireless/mwifiex/11h.c

   1/*
   2 * Marvell Wireless LAN device driver: 802.11h
   3 *
   4 * Copyright (C) 2013, Marvell International Ltd.
   5 *
   6 * This software file (the "File") is distributed by Marvell International
   7 * Ltd. under the terms of the GNU General Public License Version 2, June 1991
   8 * (the "License").  You may use, redistribute and/or modify this File in
   9 * accordance with the terms and conditions of the License, a copy of which
  10 * is available by writing to the Free Software Foundation, Inc.,
  11 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
  12 * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
  13 *
  14 * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
  15 * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
  16 * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
  17 * this warranty disclaimer.
  18 */
  19
  20#include "main.h"
  21#include "fw.h"
  22
  23
  24/* This function appends 11h info to a buffer while joining an
  25 * infrastructure BSS
  26 */
  27static void
  28mwifiex_11h_process_infra_join(struct mwifiex_private *priv, u8 **buffer,
  29                               struct mwifiex_bssdescriptor *bss_desc)
  30{
  31        struct mwifiex_ie_types_header *ie_header;
  32        struct mwifiex_ie_types_pwr_capability *cap;
  33        struct mwifiex_ie_types_local_pwr_constraint *constraint;
  34        struct ieee80211_supported_band *sband;
  35        u8 radio_type;
  36        int i;
  37
  38        if (!buffer || !(*buffer))
  39                return;
  40
  41        radio_type = mwifiex_band_to_radio_type((u8) bss_desc->bss_band);
  42        sband = priv->wdev->wiphy->bands[radio_type];
  43
  44        cap = (struct mwifiex_ie_types_pwr_capability *)*buffer;
  45        cap->header.type = cpu_to_le16(WLAN_EID_PWR_CAPABILITY);
  46        cap->header.len = cpu_to_le16(2);
  47        cap->min_pwr = 0;
  48        cap->max_pwr = 0;
  49        *buffer += sizeof(*cap);
  50
  51        constraint = (struct mwifiex_ie_types_local_pwr_constraint *)*buffer;
  52        constraint->header.type = cpu_to_le16(WLAN_EID_PWR_CONSTRAINT);
  53        constraint->header.len = cpu_to_le16(2);
  54        constraint->chan = bss_desc->channel;
  55        constraint->constraint = bss_desc->local_constraint;
  56        *buffer += sizeof(*constraint);
  57
  58        ie_header = (struct mwifiex_ie_types_header *)*buffer;
  59        ie_header->type = cpu_to_le16(TLV_TYPE_PASSTHROUGH);
  60        ie_header->len  = cpu_to_le16(2 * sband->n_channels + 2);
  61        *buffer += sizeof(*ie_header);
  62        *(*buffer)++ = WLAN_EID_SUPPORTED_CHANNELS;
  63        *(*buffer)++ = 2 * sband->n_channels;
  64        for (i = 0; i < sband->n_channels; i++) {
  65                *(*buffer)++ = ieee80211_frequency_to_channel(
  66                                        sband->channels[i].center_freq);
  67                *(*buffer)++ = 1; /* one channel in the subband */
  68        }
  69}
  70
  71/* Enable or disable the 11h extensions in the firmware */
  72static int mwifiex_11h_activate(struct mwifiex_private *priv, bool flag)
  73{
  74        u32 enable = flag;
  75
  76        return mwifiex_send_cmd_sync(priv, HostCmd_CMD_802_11_SNMP_MIB,
  77                                     HostCmd_ACT_GEN_SET, DOT11H_I, &enable);
  78}
  79
  80/* This functions processes TLV buffer for a pending BSS Join command.
  81 *
  82 * Activate 11h functionality in the firmware if the spectrum management
  83 * capability bit is found in the network we are joining. Also, necessary
  84 * TLVs are set based on requested network's 11h capability.
  85 */
  86void mwifiex_11h_process_join(struct mwifiex_private *priv, u8 **buffer,
  87                              struct mwifiex_bssdescriptor *bss_desc)
  88{
  89        if (bss_desc->sensed_11h) {
  90                /* Activate 11h functions in firmware, turns on capability
  91                 * bit
  92                 */
  93                mwifiex_11h_activate(priv, true);
  94                bss_desc->cap_info_bitmap |= WLAN_CAPABILITY_SPECTRUM_MGMT;
  95                mwifiex_11h_process_infra_join(priv, buffer, bss_desc);
  96        } else {
  97                /* Deactivate 11h functions in the firmware */
  98                mwifiex_11h_activate(priv, false);
  99                bss_desc->cap_info_bitmap &= ~WLAN_CAPABILITY_SPECTRUM_MGMT;
 100        }
 101}
 102