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         skb = alloc_skb(len, GFP_KERNEL);
  60         if (!skb)
  61                 return NULL;
  62
  63         skb_put(skb, len);
  64
  65         memset(skb->data, 0, len);
  66
  67         hdr = (struct ieee80211_hdr *)skb->data;
  68         hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA);
  69         hdr->duration_id = 0;
  70
  71         memcpy(hdr->addr1, hw->wiphy->perm_addr, ETH_ALEN);
  72         memcpy(hdr->addr2, hw->wiphy->perm_addr, ETH_ALEN);
  73         memcpy(hdr->addr3, hw->wiphy->perm_addr, ETH_ALEN);
  74
  75         if (sc->tx99_vif) {
  76                 avp = (struct ath_vif *) sc->tx99_vif->drv_priv;
  77                 hdr->seq_ctrl |= cpu_to_le16(avp->seq_no);
  78         }
  79
  80         tx_info = IEEE80211_SKB_CB(skb);
  81         memset(tx_info, 0, sizeof(*tx_info));
  82         rate = &tx_info->control.rates[0];
  83         tx_info->band = sc->cur_chan->chandef.chan->band;
  84         tx_info->flags = IEEE80211_TX_CTL_NO_ACK;
  85         tx_info->control.vif = sc->tx99_vif;
  86         rate->count = 1;
  87         if (ah->curchan && IS_CHAN_HT(ah->curchan)) {
  88                 rate->flags |= IEEE80211_TX_RC_MCS;
  89                 if (IS_CHAN_HT40(ah->curchan))
  90                         rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
  91         }
  92
  93         memcpy(skb->data + sizeof(*hdr), PN9Data, sizeof(PN9Data));
  94
  95         return skb;
  96 }
  97
  98 static void ath9k_tx99_deinit(struct ath_softc *sc)
  99 {
 100         ath_reset(sc, NULL);
 101
 102         ath9k_ps_wakeup(sc);
 103         ath9k_tx99_stop(sc);
 104         ath9k_ps_restore(sc);
 105 }
 106
 107 static int ath9k_tx99_init(struct ath_softc *sc)
 108 {
 109         struct ieee80211_hw *hw = sc->hw;
 110         struct ath_hw *ah = sc->sc_ah;
 111         struct ath_common *common = ath9k_hw_common(ah);
 112         struct ath_tx_control txctl;
 113         int r;
 114
 115         if (test_bit(ATH_OP_INVALID, &common->op_flags)) {
 116                 ath_err(common,
 117                         "driver is in invalid state unable to use TX99");
 118                 return -EINVAL;
 119         }
 120
 121         sc->tx99_skb = ath9k_build_tx99_skb(sc);
 122         if (!sc->tx99_skb)
 123                 return -ENOMEM;
 124
 125         memset(&txctl, 0, sizeof(txctl));
 126         txctl.txq = sc->tx.txq_map[IEEE80211_AC_VO];
 127
 128         ath_reset(sc, NULL);
 129
 130         ath9k_ps_wakeup(sc);
 131
 132         ath9k_hw_disable_interrupts(ah);
 133         ath_drain_all_txq(sc);
 134         ath_stoprecv(sc);
 135
 136         sc->tx99_state = true;
 137
 138         ieee80211_stop_queues(hw);
 139
 140         if (sc->tx99_power == MAX_RATE_POWER + 1)
 141                 sc->tx99_power = MAX_RATE_POWER;
 142
 143         ath9k_hw_tx99_set_txpower(ah, sc->tx99_power);
 144         r = ath9k_tx99_send(sc, sc->tx99_skb, &txctl);
 145         if (r) {
 146                 ath_dbg(common, XMIT, "Failed to xmit TX99 skb\n");
 147                 return r;
 148         }
 149
 150         ath_dbg(common, XMIT, "TX99 xmit started using %d ( %ddBm)\n",
 151                 sc->tx99_power,
 152                 sc->tx99_power / 2);
 153
 154         /* We leave the hardware awake as it will be chugging on */
 155
 156         return 0;
 157 }
 158
 159 static ssize_t read_file_tx99(struct file *file, char __user *user_buf,
 160                               size_t count, loff_t *ppos)
 161 {
 162         struct ath_softc *sc = file->private_data;
 163         char buf[3];
 164         unsigned int len;
 165
 166         len = sprintf(buf, "%d\n", sc->tx99_state);
 167         return simple_read_from_buffer(user_buf, count, ppos, buf, len);
 168 }
 169
 170 static ssize_t write_file_tx99(struct file *file, const char __user *user_buf,
 171                                size_t count, loff_t *ppos)
 172 {
 173         struct ath_softc *sc = file->private_data;
 174         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 175         char buf[32];
 176         bool start;
 177         ssize_t len;
 178         int r;
 179
 180         if (count < 1)
 181                 return -EINVAL;
 182
 183         if (sc->cur_chan->nvifs > 1)
 184                 return -EOPNOTSUPP;
 185
 186         len = min(count, sizeof(buf) - 1);
 187         if (copy_from_user(buf, user_buf, len))
 188                 return -EFAULT;
 189
 190         buf[len] = '\0';
 191
 192         if (strtobool(buf, &start))
 193                 return -EINVAL;
 194
 195         mutex_lock(&sc->mutex);
 196
 197         if (start == sc->tx99_state) {
 198                 if (!start)
 199                         goto out;
 200                 ath_dbg(common, XMIT, "Resetting TX99\n");
 201                 ath9k_tx99_deinit(sc);
 202         }
 203
 204         if (!start) {
 205                 ath9k_tx99_deinit(sc);
 206                 goto out;
 207         }
 208
 209         r = ath9k_tx99_init(sc);
 210         if (r) {
 211                 mutex_unlock(&sc->mutex);
 212                 return r;
 213         }
 214 out:
 215         mutex_unlock(&sc->mutex);
 216         return count;
 217 }
 218
 219 static const struct file_operations fops_tx99 = {
 220         .read = read_file_tx99,
 221         .write = write_file_tx99,
 222         .open = simple_open,
 223         .owner = THIS_MODULE,
 224         .llseek = default_llseek,
 225 };
 226
 227 static ssize_t read_file_tx99_power(struct file *file,
 228                                     char __user *user_buf,
 229                                     size_t count, loff_t *ppos)
 230 {
 231         struct ath_softc *sc = file->private_data;
 232         char buf[32];
 233         unsigned int len;
 234
 235         len = sprintf(buf, "%d (%d dBm)\n",
 236                       sc->tx99_power,
 237                       sc->tx99_power / 2);
 238
 239         return simple_read_from_buffer(user_buf, count, ppos, buf, len);
 240 }
 241
 242 static ssize_t write_file_tx99_power(struct file *file,
 243                                      const char __user *user_buf,
 244                                      size_t count, loff_t *ppos)
 245 {
 246         struct ath_softc *sc = file->private_data;
 247         int r;
 248         u8 tx_power;
 249
 250         r = kstrtou8_from_user(user_buf, count, 0, &tx_power);
 251         if (r)
 252                 return r;
 253
 254         if (tx_power > MAX_RATE_POWER)
 255                 return -EINVAL;
 256
 257         sc->tx99_power = tx_power;
 258
 259         ath9k_ps_wakeup(sc);
 260         ath9k_hw_tx99_set_txpower(sc->sc_ah, sc->tx99_power);
 261         ath9k_ps_restore(sc);
 262
 263         return count;
 264 }
 265
 266 static const struct file_operations fops_tx99_power = {
 267         .read = read_file_tx99_power,
 268         .write = write_file_tx99_power,
 269         .open = simple_open,
 270         .owner = THIS_MODULE,
 271         .llseek = default_llseek,
 272 };
 273
 274 void ath9k_tx99_init_debug(struct ath_softc *sc)
 275 {
 276         if (!AR_SREV_9280_20_OR_LATER(sc->sc_ah))
 277                 return;
 278
 279         debugfs_create_file("tx99", 0600,
 280                             sc->debug.debugfs_phy, sc,
 281                             &fops_tx99);
 282         debugfs_create_file("tx99_power", 0600,
 283                             sc->debug.debugfs_phy, sc,
 284                             &fops_tx99_power);
 285 }