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
  58         skb = alloc_skb(len, GFP_KERNEL);
  59         if (!skb)
  60                 return NULL;
  61
  62         skb_put(skb, len);
  63
  64         memset(skb->data, 0, len);
  65
  66         hdr = (struct ieee80211_hdr *)skb->data;
  67         hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA);
  68         hdr->duration_id = 0;
  69
  70         memcpy(hdr->addr1, hw->wiphy->perm_addr, ETH_ALEN);
  71         memcpy(hdr->addr2, hw->wiphy->perm_addr, ETH_ALEN);
  72         memcpy(hdr->addr3, hw->wiphy->perm_addr, ETH_ALEN);
  73
  74         hdr->seq_ctrl |= cpu_to_le16(sc->tx.seq_no);
  75
  76         tx_info = IEEE80211_SKB_CB(skb);
  77         memset(tx_info, 0, sizeof(*tx_info));
  78         rate = &tx_info->control.rates[0];
  79         tx_info->band = hw->conf.chandef.chan->band;
  80         tx_info->flags = IEEE80211_TX_CTL_NO_ACK;
  81         tx_info->control.vif = sc->tx99_vif;
  82         rate->count = 1;
  83         if (ah->curchan && IS_CHAN_HT(ah->curchan)) {
  84                 rate->flags |= IEEE80211_TX_RC_MCS;
  85                 if (IS_CHAN_HT40(ah->curchan))
  86                         rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
  87         }
  88
  89         memcpy(skb->data + sizeof(*hdr), PN9Data, sizeof(PN9Data));
  90
  91         return skb;
  92 }
  93
  94 static void ath9k_tx99_deinit(struct ath_softc *sc)
  95 {
  96         ath_reset(sc);
  97
  98         ath9k_ps_wakeup(sc);
  99         ath9k_tx99_stop(sc);
 100         ath9k_ps_restore(sc);
 101 }
 102
 103 static int ath9k_tx99_init(struct ath_softc *sc)
 104 {
 105         struct ieee80211_hw *hw = sc->hw;
 106         struct ath_hw *ah = sc->sc_ah;
 107         struct ath_common *common = ath9k_hw_common(ah);
 108         struct ath_tx_control txctl;
 109         int r;
 110
 111         if (test_bit(SC_OP_INVALID, &sc->sc_flags)) {
 112                 ath_err(common,
 113                         "driver is in invalid state unable to use TX99");
 114                 return -EINVAL;
 115         }
 116
 117         sc->tx99_skb = ath9k_build_tx99_skb(sc);
 118         if (!sc->tx99_skb)
 119                 return -ENOMEM;
 120
 121         memset(&txctl, 0, sizeof(txctl));
 122         txctl.txq = sc->tx.txq_map[IEEE80211_AC_VO];
 123
 124         ath_reset(sc);
 125
 126         ath9k_ps_wakeup(sc);
 127
 128         ath9k_hw_disable_interrupts(ah);
 129         atomic_set(&ah->intr_ref_cnt, -1);
 130         ath_drain_all_txq(sc);
 131         ath_stoprecv(sc);
 132
 133         sc->tx99_state = true;
 134
 135         ieee80211_stop_queues(hw);
 136
 137         if (sc->tx99_power == MAX_RATE_POWER + 1)
 138                 sc->tx99_power = MAX_RATE_POWER;
 139
 140         ath9k_hw_tx99_set_txpower(ah, sc->tx99_power);
 141         r = ath9k_tx99_send(sc, sc->tx99_skb, &txctl);
 142         if (r) {
 143                 ath_dbg(common, XMIT, "Failed to xmit TX99 skb\n");
 144                 return r;
 145         }
 146
 147         ath_dbg(common, XMIT, "TX99 xmit started using %d ( %ddBm)\n",
 148                 sc->tx99_power,
 149                 sc->tx99_power / 2);
 150
 151         /* We leave the harware awake as it will be chugging on */
 152
 153         return 0;
 154 }
 155
 156 static ssize_t read_file_tx99(struct file *file, char __user *user_buf,
 157                               size_t count, loff_t *ppos)
 158 {
 159         struct ath_softc *sc = file->private_data;
 160         char buf[3];
 161         unsigned int len;
 162
 163         len = sprintf(buf, "%d\n", sc->tx99_state);
 164         return simple_read_from_buffer(user_buf, count, ppos, buf, len);
 165 }
 166
 167 static ssize_t write_file_tx99(struct file *file, const char __user *user_buf,
 168                                size_t count, loff_t *ppos)
 169 {
 170         struct ath_softc *sc = file->private_data;
 171         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 172         char buf[32];
 173         bool start;
 174         ssize_t len;
 175         int r;
 176
 177         if (sc->nvifs > 1)
 178                 return -EOPNOTSUPP;
 179
 180         len = min(count, sizeof(buf) - 1);
 181         if (copy_from_user(buf, user_buf, len))
 182                 return -EFAULT;
 183
 184         if (strtobool(buf, &start))
 185                 return -EINVAL;
 186
 187         if (start == sc->tx99_state) {
 188                 if (!start)
 189                         return count;
 190                 ath_dbg(common, XMIT, "Resetting TX99\n");
 191                 ath9k_tx99_deinit(sc);
 192         }
 193
 194         if (!start) {
 195                 ath9k_tx99_deinit(sc);
 196                 return count;
 197         }
 198
 199         r = ath9k_tx99_init(sc);
 200         if (r)
 201                 return r;
 202
 203         return count;
 204 }
 205
 206 static const struct file_operations fops_tx99 = {
 207         .read = read_file_tx99,
 208         .write = write_file_tx99,
 209         .open = simple_open,
 210         .owner = THIS_MODULE,
 211         .llseek = default_llseek,
 212 };
 213
 214 static ssize_t read_file_tx99_power(struct file *file,
 215                                     char __user *user_buf,
 216                                     size_t count, loff_t *ppos)
 217 {
 218         struct ath_softc *sc = file->private_data;
 219         char buf[32];
 220         unsigned int len;
 221
 222         len = sprintf(buf, "%d (%d dBm)\n",
 223                       sc->tx99_power,
 224                       sc->tx99_power / 2);
 225
 226         return simple_read_from_buffer(user_buf, count, ppos, buf, len);
 227 }
 228
 229 static ssize_t write_file_tx99_power(struct file *file,
 230                                      const char __user *user_buf,
 231                                      size_t count, loff_t *ppos)
 232 {
 233         struct ath_softc *sc = file->private_data;
 234         int r;
 235         u8 tx_power;
 236
 237         r = kstrtou8_from_user(user_buf, count, 0, &tx_power);
 238         if (r)
 239                 return r;
 240
 241         if (tx_power > MAX_RATE_POWER)
 242                 return -EINVAL;
 243
 244         sc->tx99_power = tx_power;
 245
 246         ath9k_ps_wakeup(sc);
 247         ath9k_hw_tx99_set_txpower(sc->sc_ah, sc->tx99_power);
 248         ath9k_ps_restore(sc);
 249
 250         return count;
 251 }
 252
 253 static const struct file_operations fops_tx99_power = {
 254         .read = read_file_tx99_power,
 255         .write = write_file_tx99_power,
 256         .open = simple_open,
 257         .owner = THIS_MODULE,
 258         .llseek = default_llseek,
 259 };
 260
 261 void ath9k_tx99_init_debug(struct ath_softc *sc)
 262 {
 263         if (!AR_SREV_9300_20_OR_LATER(sc->sc_ah))
 264                 return;
 265
 266         debugfs_create_file("tx99", S_IRUSR | S_IWUSR,
 267                             sc->debug.debugfs_phy, sc,
 268                             &fops_tx99);
 269         debugfs_create_file("tx99_power", S_IRUSR | S_IWUSR,
 270                             sc->debug.debugfs_phy, sc,
 271                             &fops_tx99_power);
 272 }