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 = sc->cur_chan->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(ATH_OP_INVALID, &common->op_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 } 273