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 (kstrtobool(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 } 286