linux/drivers/net/wireless/ath/ath9k/tx99.c
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   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
  19static 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
  40static 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
 100static 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
 109static 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        ath_drain_all_txq(sc);
 136        ath_stoprecv(sc);
 137
 138        sc->tx99_state = true;
 139
 140        ieee80211_stop_queues(hw);
 141
 142        if (sc->tx99_power == MAX_RATE_POWER + 1)
 143                sc->tx99_power = MAX_RATE_POWER;
 144
 145        ath9k_hw_tx99_set_txpower(ah, sc->tx99_power);
 146        r = ath9k_tx99_send(sc, sc->tx99_skb, &txctl);
 147        if (r) {
 148                ath_dbg(common, XMIT, "Failed to xmit TX99 skb\n");
 149                return r;
 150        }
 151
 152        ath_dbg(common, XMIT, "TX99 xmit started using %d ( %ddBm)\n",
 153                sc->tx99_power,
 154                sc->tx99_power / 2);
 155
 156        /* We leave the harware awake as it will be chugging on */
 157
 158        return 0;
 159}
 160
 161static ssize_t read_file_tx99(struct file *file, char __user *user_buf,
 162                              size_t count, loff_t *ppos)
 163{
 164        struct ath_softc *sc = file->private_data;
 165        char buf[3];
 166        unsigned int len;
 167
 168        len = sprintf(buf, "%d\n", sc->tx99_state);
 169        return simple_read_from_buffer(user_buf, count, ppos, buf, len);
 170}
 171
 172static ssize_t write_file_tx99(struct file *file, const char __user *user_buf,
 173                               size_t count, loff_t *ppos)
 174{
 175        struct ath_softc *sc = file->private_data;
 176        struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 177        char buf[32];
 178        bool start;
 179        ssize_t len;
 180        int r;
 181
 182        if (sc->cur_chan->nvifs > 1)
 183                return -EOPNOTSUPP;
 184
 185        len = min(count, sizeof(buf) - 1);
 186        if (copy_from_user(buf, user_buf, len))
 187                return -EFAULT;
 188
 189        if (strtobool(buf, &start))
 190                return -EINVAL;
 191
 192        if (start == sc->tx99_state) {
 193                if (!start)
 194                        return count;
 195                ath_dbg(common, XMIT, "Resetting TX99\n");
 196                ath9k_tx99_deinit(sc);
 197        }
 198
 199        if (!start) {
 200                ath9k_tx99_deinit(sc);
 201                return count;
 202        }
 203
 204        r = ath9k_tx99_init(sc);
 205        if (r)
 206                return r;
 207
 208        return count;
 209}
 210
 211static const struct file_operations fops_tx99 = {
 212        .read = read_file_tx99,
 213        .write = write_file_tx99,
 214        .open = simple_open,
 215        .owner = THIS_MODULE,
 216        .llseek = default_llseek,
 217};
 218
 219static ssize_t read_file_tx99_power(struct file *file,
 220                                    char __user *user_buf,
 221                                    size_t count, loff_t *ppos)
 222{
 223        struct ath_softc *sc = file->private_data;
 224        char buf[32];
 225        unsigned int len;
 226
 227        len = sprintf(buf, "%d (%d dBm)\n",
 228                      sc->tx99_power,
 229                      sc->tx99_power / 2);
 230
 231        return simple_read_from_buffer(user_buf, count, ppos, buf, len);
 232}
 233
 234static ssize_t write_file_tx99_power(struct file *file,
 235                                     const char __user *user_buf,
 236                                     size_t count, loff_t *ppos)
 237{
 238        struct ath_softc *sc = file->private_data;
 239        int r;
 240        u8 tx_power;
 241
 242        r = kstrtou8_from_user(user_buf, count, 0, &tx_power);
 243        if (r)
 244                return r;
 245
 246        if (tx_power > MAX_RATE_POWER)
 247                return -EINVAL;
 248
 249        sc->tx99_power = tx_power;
 250
 251        ath9k_ps_wakeup(sc);
 252        ath9k_hw_tx99_set_txpower(sc->sc_ah, sc->tx99_power);
 253        ath9k_ps_restore(sc);
 254
 255        return count;
 256}
 257
 258static const struct file_operations fops_tx99_power = {
 259        .read = read_file_tx99_power,
 260        .write = write_file_tx99_power,
 261        .open = simple_open,
 262        .owner = THIS_MODULE,
 263        .llseek = default_llseek,
 264};
 265
 266void ath9k_tx99_init_debug(struct ath_softc *sc)
 267{
 268        if (!AR_SREV_9280_20_OR_LATER(sc->sc_ah))
 269                return;
 270
 271        debugfs_create_file("tx99", S_IRUSR | S_IWUSR,
 272                            sc->debug.debugfs_phy, sc,
 273                            &fops_tx99);
 274        debugfs_create_file("tx99_power", S_IRUSR | S_IWUSR,
 275                            sc->debug.debugfs_phy, sc,
 276                            &fops_tx99_power);
 277}
 278