drivers/net/wireless/iwlwifi/iwl-spectrum.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2003 - 2009 Intel Corporation. All rights reserved.
   4  *
   5  * Portions of this file are derived from the ipw3945 project, as well
   6  * as portions of the ieee80211 subsystem header files.
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of version 2 of the GNU General Public License as
  10  * published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but WITHOUT
  13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  15  * more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along with
  18  * this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  20  *
  21  * The full GNU General Public License is included in this distribution in the
  22  * file called LICENSE.
  23  *
  24  * Contact Information:
  25  *  Intel Linux Wireless <ilw@linux.intel.com>
  26  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  27  *
  28  *****************************************************************************/
  29
  30 #include <linux/kernel.h>
  31 #include <linux/module.h>
  32 #include <linux/init.h>
  33 #include <linux/pci.h>
  34 #include <linux/delay.h>
  35 #include <linux/skbuff.h>
  36 #include <linux/netdevice.h>
  37 #include <linux/wireless.h>
  38
  39 #include <net/mac80211.h>
  40
  41 #include "iwl-eeprom.h"
  42 #include "iwl-dev.h"
  43 #include "iwl-core.h"
  44 #include "iwl-io.h"
  45 #include "iwl-spectrum.h"
  46
  47 #define BEACON_TIME_MASK_LOW    0x00FFFFFF
  48 #define BEACON_TIME_MASK_HIGH   0xFF000000
  49 #define TIME_UNIT               1024
  50
  51 /*
  52  * extended beacon time format
  53  * time in usec will be changed into a 32-bit value in 8:24 format
  54  * the high 1 byte is the beacon counts
  55  * the lower 3 bytes is the time in usec within one beacon interval
  56  */
  57
  58 /* TOOD: was used in sysfs debug interface need to add to mac */
  59 #if 0
  60 static u32 iwl_usecs_to_beacons(u32 usec, u32 beacon_interval)
  61 {
  62         u32 quot;
  63         u32 rem;
  64         u32 interval = beacon_interval * 1024;
  65
  66         if (!interval || !usec)
  67                 return 0;
  68
  69         quot = (usec / interval) & (BEACON_TIME_MASK_HIGH >> 24);
  70         rem = (usec % interval) & BEACON_TIME_MASK_LOW;
  71
  72         return (quot << 24) + rem;
  73 }
  74
  75 /* base is usually what we get from ucode with each received frame,
  76  * the same as HW timer counter counting down
  77  */
  78
  79 static __le32 iwl_add_beacon_time(u32 base, u32 addon, u32 beacon_interval)
  80 {
  81         u32 base_low = base & BEACON_TIME_MASK_LOW;
  82         u32 addon_low = addon & BEACON_TIME_MASK_LOW;
  83         u32 interval = beacon_interval * TIME_UNIT;
  84         u32 res = (base & BEACON_TIME_MASK_HIGH) +
  85             (addon & BEACON_TIME_MASK_HIGH);
  86
  87         if (base_low > addon_low)
  88                 res += base_low - addon_low;
  89         else if (base_low < addon_low) {
  90                 res += interval + base_low - addon_low;
  91                 res += (1 << 24);
  92         } else
  93                 res += (1 << 24);
  94
  95         return cpu_to_le32(res);
  96 }
  97 static int iwl_get_measurement(struct iwl_priv *priv,
  98                                struct ieee80211_measurement_params *params,
  99                                u8 type)
 100 {
 101         struct iwl4965_spectrum_cmd spectrum;
 102         struct iwl_rx_packet *res;
 103         struct iwl_host_cmd cmd = {
 104                 .id = REPLY_SPECTRUM_MEASUREMENT_CMD,
 105                 .data = (void *)&spectrum,
 106                 .meta.flags = CMD_WANT_SKB,
 107         };
 108         u32 add_time = le64_to_cpu(params->start_time);
 109         int rc;
 110         int spectrum_resp_status;
 111         int duration = le16_to_cpu(params->duration);
 112
 113         if (iwl_is_associated(priv))
 114                 add_time =
 115                     iwl_usecs_to_beacons(
 116                         le64_to_cpu(params->start_time) - priv->last_tsf,
 117                         le16_to_cpu(priv->rxon_timing.beacon_interval));
 118
 119         memset(&spectrum, 0, sizeof(spectrum));
 120
 121         spectrum.channel_count = cpu_to_le16(1);
 122         spectrum.flags =
 123             RXON_FLG_TSF2HOST_MSK | RXON_FLG_ANT_A_MSK | RXON_FLG_DIS_DIV_MSK;
 124         spectrum.filter_flags = MEASUREMENT_FILTER_FLAG;
 125         cmd.len = sizeof(spectrum);
 126         spectrum.len = cpu_to_le16(cmd.len - sizeof(spectrum.len));
 127
 128         if (iwl_is_associated(priv))
 129                 spectrum.start_time =
 130                     iwl_add_beacon_time(priv->last_beacon_time,
 131                                 add_time,
 132                                 le16_to_cpu(priv->rxon_timing.beacon_interval));
 133         else
 134                 spectrum.start_time = 0;
 135
 136         spectrum.channels[0].duration = cpu_to_le32(duration * TIME_UNIT);
 137         spectrum.channels[0].channel = params->channel;
 138         spectrum.channels[0].type = type;
 139         if (priv->active_rxon.flags & RXON_FLG_BAND_24G_MSK)
 140                 spectrum.flags |= RXON_FLG_BAND_24G_MSK |
 141                     RXON_FLG_AUTO_DETECT_MSK | RXON_FLG_TGG_PROTECT_MSK;
 142
 143         rc = iwl_send_cmd_sync(priv, &cmd);
 144         if (rc)
 145                 return rc;
 146
 147         res = (struct iwl_rx_packet *)cmd.meta.u.skb->data;
 148         if (res->hdr.flags & IWL_CMD_FAILED_MSK) {
 149                 IWL_ERR(priv, "Bad return from REPLY_RX_ON_ASSOC command\n");
 150                 rc = -EIO;
 151         }
 152
 153         spectrum_resp_status = le16_to_cpu(res->u.spectrum.status);
 154         switch (spectrum_resp_status) {
 155         case 0:         /* Command will be handled */
 156                 if (res->u.spectrum.id != 0xff) {
 157                         IWL_DEBUG_INFO
 158                             ("Replaced existing measurement: %d\n",
 159                              res->u.spectrum.id);
 160                         priv->measurement_status &= ~MEASUREMENT_READY;
 161                 }
 162                 priv->measurement_status |= MEASUREMENT_ACTIVE;
 163                 rc = 0;
 164                 break;
 165
 166         case 1:         /* Command will not be handled */
 167                 rc = -EAGAIN;
 168                 break;
 169         }
 170
 171         dev_kfree_skb_any(cmd.meta.u.skb);
 172
 173         return rc;
 174 }
 175 #endif
 176
 177 static void iwl_rx_spectrum_measure_notif(struct iwl_priv *priv,
 178                                           struct iwl_rx_mem_buffer *rxb)
 179 {
 180         struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
 181         struct iwl_spectrum_notification *report = &(pkt->u.spectrum_notif);
 182
 183         if (!report->state) {
 184                 IWL_DEBUG(IWL_DL_11H,
 185                         "Spectrum Measure Notification: Start\n");
 186                 return;
 187         }
 188
 189         memcpy(&priv->measure_report, report, sizeof(*report));
 190         priv->measurement_status |= MEASUREMENT_READY;
 191 }
 192
 193 void iwl_setup_spectrum_handlers(struct iwl_priv *priv)
 194 {
 195         priv->rx_handlers[SPECTRUM_MEASURE_NOTIFICATION] =
 196                         iwl_rx_spectrum_measure_notif;
 197 }
 198 EXPORT_SYMBOL(iwl_setup_spectrum_handlers);