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  */
  27 static void
  28 mwifiex_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 */
  72 static 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  */
  86 void 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 }