drivers/net/wireless/ath/ath9k/tx99.c

   1 /*
   2  * Copyright (c) 2013 Qualcomm Atheros, Inc.
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #include "ath9k.h"
  18
  19 static void ath9k_tx99_stop(struct ath_softc *sc)
  20 {
  21         struct ath_hw *ah = sc->sc_ah;
  22         struct ath_common *common = ath9k_hw_common(ah);
  23
  24         ath_drain_all_txq(sc);
  25         ath_startrecv(sc);
  26
  27         ath9k_hw_set_interrupts(ah);
  28         ath9k_hw_enable_interrupts(ah);
  29
  30         ieee80211_wake_queues(sc->hw);
  31
  32         kfree_skb(sc->tx99_skb);
  33         sc->tx99_skb = NULL;
  34         sc->tx99_state = false;
  35
  36         ath9k_hw_tx99_stop(sc->sc_ah);
  37         ath_dbg(common, XMIT, "TX99 stopped\n");
  38 }
  39
  40 static struct sk_buff *ath9k_build_tx99_skb(struct ath_softc *sc)
  41 {
  42         static u8 PN9Data[] = {0xff, 0x87, 0xb8, 0x59, 0xb7, 0xa1, 0xcc, 0x24,
  43                                0x57, 0x5e, 0x4b, 0x9c, 0x0e, 0xe9, 0xea, 0x50,
  44                                0x2a, 0xbe, 0xb4, 0x1b, 0xb6, 0xb0, 0x5d, 0xf1,
  45                                0xe6, 0x9a, 0xe3, 0x45, 0xfd, 0x2c, 0x53, 0x18,
  46                                0x0c, 0xca, 0xc9, 0xfb, 0x49, 0x37, 0xe5, 0xa8,
  47                                0x51, 0x3b, 0x2f, 0x61, 0xaa, 0x72, 0x18, 0x84,
  48                                0x02, 0x23, 0x23, 0xab, 0x63, 0x89, 0x51, 0xb3,
  49                                0xe7, 0x8b, 0x72, 0x90, 0x4c, 0xe8, 0xfb, 0xc0};
  50         u32 len = 1200;
  51         struct ieee80211_tx_rate *rate;
  52         struct ieee80211_hw *hw = sc->hw;
  53         struct ath_hw *ah = sc->sc_ah;
  54         struct ieee80211_hdr *hdr;
  55         struct ieee80211_tx_info *tx_info;
  56         struct sk_buff *skb;
  57         struct ath_vif *avp;
  58
  59         if (!sc->tx99_vif)
  60                 return NULL;
  61
  62         avp = (struct ath_vif *)sc->tx99_vif->drv_priv;
  63
  64         skb = alloc_skb(len, GFP_KERNEL);
  65         if (!skb)
  66                 return NULL;
  67
  68         skb_put(skb, len);
  69
  70         memset(skb->data, 0, len);
  71
  72         hdr = (struct ieee80211_hdr *)skb->data;
  73         hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA);
  74         hdr->duration_id = 0;
  75
  76         memcpy(hdr->addr1, hw->wiphy->perm_addr, ETH_ALEN);
  77         memcpy(hdr->addr2, hw->wiphy->perm_addr, ETH_ALEN);
  78         memcpy(hdr->addr3, hw->wiphy->perm_addr, ETH_ALEN);
  79
  80         hdr->seq_ctrl |= cpu_to_le16(avp->seq_no);
  81
  82         tx_info = IEEE80211_SKB_CB(skb);
  83         memset(tx_info, 0, sizeof(*tx_info));
  84         rate = &tx_info->control.rates[0];
  85         tx_info->band = sc->cur_chan->chandef.chan->band;
  86         tx_info->flags = IEEE80211_TX_CTL_NO_ACK;
  87         tx_info->control.vif = sc->tx99_vif;
  88         rate->count = 1;
  89         if (ah->curchan && IS_CHAN_HT(ah->curchan)) {
  90                 rate->flags |= IEEE80211_TX_RC_MCS;
  91                 if (IS_CHAN_HT40(ah->curchan))
  92                         rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
  93         }
  94
  95         memcpy(skb->data + sizeof(*hdr), PN9Data, sizeof(PN9Data));
  96
  97         return skb;
  98 }
  99
 100 static void ath9k_tx99_deinit(struct ath_softc *sc)
 101 {
 102         ath_reset(sc, NULL);
 103
 104         ath9k_ps_wakeup(sc);
 105         ath9k_tx99_stop(sc);
 106         ath9k_ps_restore(sc);
 107 }
 108
 109 static int ath9k_tx99_init(struct ath_softc *sc)
 110 {
 111         struct ieee80211_hw *hw = sc->hw;
 112         struct ath_hw *ah = sc->sc_ah;
 113         struct ath_common *common = ath9k_hw_common(ah);
 114         struct ath_tx_control txctl;
 115         int r;
 116
 117         if (test_bit(ATH_OP_INVALID, &common->op_flags)) {
 118                 ath_err(common,
 119                         "driver is in invalid state unable to use TX99");
 120                 return -EINVAL;
 121         }
 122
 123         sc->tx99_skb = ath9k_build_tx99_skb(sc);
 124         if (!sc->tx99_skb)
 125                 return -ENOMEM;
 126
 127         memset(&txctl, 0, sizeof(txctl));
 128         txctl.txq = sc->tx.txq_map[IEEE80211_AC_VO];
 129
 130         ath_reset(sc, NULL);
 131
 132         ath9k_ps_wakeup(sc);
 133
 134         ath9k_hw_disable_interrupts(ah);
 135         atomic_set(&ah->intr_ref_cnt, -1);
 136         ath_drain_all_txq(sc);
 137         ath_stoprecv(sc);
 138
 139         sc->tx99_state = true;
 140
 141         ieee80211_stop_queues(hw);
 142
 143         if (sc->tx99_power == MAX_RATE_POWER + 1)
 144                 sc->tx99_power = MAX_RATE_POWER;
 145
 146         ath9k_hw_tx99_set_txpower(ah, sc->tx99_power);
 147         r = ath9k_tx99_send(sc, sc->tx99_skb, &txctl);
 148         if (r) {
 149                 ath_dbg(common, XMIT, "Failed to xmit TX99 skb\n");
 150                 return r;
 151         }
 152
 153         ath_dbg(common, XMIT, "TX99 xmit started using %d ( %ddBm)\n",
 154                 sc->tx99_power,
 155                 sc->tx99_power / 2);
 156
 157         /* We leave the harware awake as it will be chugging on */
 158
 159         return 0;
 160 }
 161
 162 static ssize_t read_file_tx99(struct file *file, char __user *user_buf,
 163                               size_t count, loff_t *ppos)
 164 {
 165         struct ath_softc *sc = file->private_data;
 166         char buf[3];
 167         unsigned int len;
 168
 169         len = sprintf(buf, "%d\n", sc->tx99_state);
 170         return simple_read_from_buffer(user_buf, count, ppos, buf, len);
 171 }
 172
 173 static ssize_t write_file_tx99(struct file *file, const char __user *user_buf,
 174                                size_t count, loff_t *ppos)
 175 {
 176         struct ath_softc *sc = file->private_data;
 177         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 178         char buf[32];
 179         bool start;
 180         ssize_t len;
 181         int r;
 182
 183         if (count < 1)
 184                 return -EINVAL;
 185
 186         if (sc->cur_chan->nvifs > 1)
 187                 return -EOPNOTSUPP;
 188
 189         len = min(count, sizeof(buf) - 1);
 190         if (copy_from_user(buf, user_buf, len))
 191                 return -EFAULT;
 192
 193         buf[len] = '\0';
 194
 195         if (strtobool(buf, &start))
 196                 return -EINVAL;
 197
 198         mutex_lock(&sc->mutex);
 199
 200         if (start == sc->tx99_state) {
 201                 if (!start)
 202                         goto out;
 203                 ath_dbg(common, XMIT, "Resetting TX99\n");
 204                 ath9k_tx99_deinit(sc);
 205         }
 206
 207         if (!start) {
 208                 ath9k_tx99_deinit(sc);
 209                 goto out;
 210         }
 211
 212         r = ath9k_tx99_init(sc);
 213         if (r) {
 214                 mutex_unlock(&sc->mutex);
 215                 return r;
 216         }
 217 out:
 218         mutex_unlock(&sc->mutex);
 219         return count;
 220 }
 221
 222 static const struct file_operations fops_tx99 = {
 223         .read = read_file_tx99,
 224         .write = write_file_tx99,
 225         .open = simple_open,
 226         .owner = THIS_MODULE,
 227         .llseek = default_llseek,
 228 };
 229
 230 static ssize_t read_file_tx99_power(struct file *file,
 231                                     char __user *user_buf,
 232                                     size_t count, loff_t *ppos)
 233 {
 234         struct ath_softc *sc = file->private_data;
 235         char buf[32];
 236         unsigned int len;
 237
 238         len = sprintf(buf, "%d (%d dBm)\n",
 239                       sc->tx99_power,
 240                       sc->tx99_power / 2);
 241
 242         return simple_read_from_buffer(user_buf, count, ppos, buf, len);
 243 }
 244
 245 static ssize_t write_file_tx99_power(struct file *file,
 246                                      const char __user *user_buf,
 247                                      size_t count, loff_t *ppos)
 248 {
 249         struct ath_softc *sc = file->private_data;
 250         int r;
 251         u8 tx_power;
 252
 253         r = kstrtou8_from_user(user_buf, count, 0, &tx_power);
 254         if (r)
 255                 return r;
 256
 257         if (tx_power > MAX_RATE_POWER)
 258                 return -EINVAL;
 259
 260         sc->tx99_power = tx_power;
 261
 262         ath9k_ps_wakeup(sc);
 263         ath9k_hw_tx99_set_txpower(sc->sc_ah, sc->tx99_power);
 264         ath9k_ps_restore(sc);
 265
 266         return count;
 267 }
 268
 269 static const struct file_operations fops_tx99_power = {
 270         .read = read_file_tx99_power,
 271         .write = write_file_tx99_power,
 272         .open = simple_open,
 273         .owner = THIS_MODULE,
 274         .llseek = default_llseek,
 275 };
 276
 277 void ath9k_tx99_init_debug(struct ath_softc *sc)
 278 {
 279         if (!AR_SREV_9300_20_OR_LATER(sc->sc_ah))
 280                 return;
 281
 282         debugfs_create_file("tx99", S_IRUSR | S_IWUSR,
 283                             sc->debug.debugfs_phy, sc,
 284                             &fops_tx99);
 285         debugfs_create_file("tx99_power", S_IRUSR | S_IWUSR,
 286                             sc->debug.debugfs_phy, sc,
 287                             &fops_tx99_power);
 288 }