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 (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 if (strtobool(buf, &start)) 191 return -EINVAL; 192 193 if (start == sc->tx99_state) { 194 if (!start) 195 return count; 196 ath_dbg(common, XMIT, "Resetting TX99\n"); 197 ath9k_tx99_deinit(sc); 198 } 199 200 if (!start) { 201 ath9k_tx99_deinit(sc); 202 return count; 203 } 204 205 r = ath9k_tx99_init(sc); 206 if (r) 207 return r; 208 209 return count; 210 } 211 212 static const struct file_operations fops_tx99 = { 213 .read = read_file_tx99, 214 .write = write_file_tx99, 215 .open = simple_open, 216 .owner = THIS_MODULE, 217 .llseek = default_llseek, 218 }; 219 220 static ssize_t read_file_tx99_power(struct file *file, 221 char __user *user_buf, 222 size_t count, loff_t *ppos) 223 { 224 struct ath_softc *sc = file->private_data; 225 char buf[32]; 226 unsigned int len; 227 228 len = sprintf(buf, "%d (%d dBm)\n", 229 sc->tx99_power, 230 sc->tx99_power / 2); 231 232 return simple_read_from_buffer(user_buf, count, ppos, buf, len); 233 } 234 235 static ssize_t write_file_tx99_power(struct file *file, 236 const char __user *user_buf, 237 size_t count, loff_t *ppos) 238 { 239 struct ath_softc *sc = file->private_data; 240 int r; 241 u8 tx_power; 242 243 r = kstrtou8_from_user(user_buf, count, 0, &tx_power); 244 if (r) 245 return r; 246 247 if (tx_power > MAX_RATE_POWER) 248 return -EINVAL; 249 250 sc->tx99_power = tx_power; 251 252 ath9k_ps_wakeup(sc); 253 ath9k_hw_tx99_set_txpower(sc->sc_ah, sc->tx99_power); 254 ath9k_ps_restore(sc); 255 256 return count; 257 } 258 259 static const struct file_operations fops_tx99_power = { 260 .read = read_file_tx99_power, 261 .write = write_file_tx99_power, 262 .open = simple_open, 263 .owner = THIS_MODULE, 264 .llseek = default_llseek, 265 }; 266 267 void ath9k_tx99_init_debug(struct ath_softc *sc) 268 { 269 if (!AR_SREV_9300_20_OR_LATER(sc->sc_ah)) 270 return; 271 272 debugfs_create_file("tx99", S_IRUSR | S_IWUSR, 273 sc->debug.debugfs_phy, sc, 274 &fops_tx99); 275 debugfs_create_file("tx99_power", S_IRUSR | S_IWUSR, 276 sc->debug.debugfs_phy, sc, 277 &fops_tx99_power); 278 } 279