| 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_hw *hw = sc->hw; |
| 52 | struct ieee80211_hdr *hdr; |
| 53 | struct ieee80211_tx_info *tx_info; |
| 54 | struct sk_buff *skb; |
| 55 | |
| 56 | skb = alloc_skb(len, GFP_KERNEL); |
| 57 | if (!skb) |
| 58 | return NULL; |
| 59 | |
| 60 | skb_put(skb, len); |
| 61 | |
| 62 | memset(skb->data, 0, len); |
| 63 | |
| 64 | hdr = (struct ieee80211_hdr *)skb->data; |
| 65 | hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA); |
| 66 | hdr->duration_id = 0; |
| 67 | |
| 68 | memcpy(hdr->addr1, hw->wiphy->perm_addr, ETH_ALEN); |
| 69 | memcpy(hdr->addr2, hw->wiphy->perm_addr, ETH_ALEN); |
| 70 | memcpy(hdr->addr3, hw->wiphy->perm_addr, ETH_ALEN); |
| 71 | |
| 72 | hdr->seq_ctrl |= cpu_to_le16(sc->tx.seq_no); |
| 73 | |
| 74 | tx_info = IEEE80211_SKB_CB(skb); |
| 75 | memset(tx_info, 0, sizeof(*tx_info)); |
| 76 | tx_info->band = hw->conf.chandef.chan->band; |
| 77 | tx_info->flags = IEEE80211_TX_CTL_NO_ACK; |
| 78 | tx_info->control.vif = sc->tx99_vif; |
| 79 | tx_info->control.rates[0].count = 1; |
| 80 | |
| 81 | memcpy(skb->data + sizeof(*hdr), PN9Data, sizeof(PN9Data)); |
| 82 | |
| 83 | return skb; |
| 84 | } |
| 85 | |
| 86 | static void ath9k_tx99_deinit(struct ath_softc *sc) |
| 87 | { |
| 88 | ath_reset(sc); |
| 89 | |
| 90 | ath9k_ps_wakeup(sc); |
| 91 | ath9k_tx99_stop(sc); |
| 92 | ath9k_ps_restore(sc); |
| 93 | } |
| 94 | |
| 95 | static int ath9k_tx99_init(struct ath_softc *sc) |
| 96 | { |
| 97 | struct ieee80211_hw *hw = sc->hw; |
| 98 | struct ath_hw *ah = sc->sc_ah; |
| 99 | struct ath_common *common = ath9k_hw_common(ah); |
| 100 | struct ath_tx_control txctl; |
| 101 | int r; |
| 102 | |
| 103 | if (test_bit(SC_OP_INVALID, &sc->sc_flags)) { |
| 104 | ath_err(common, |
| 105 | "driver is in invalid state unable to use TX99"); |
| 106 | return -EINVAL; |
| 107 | } |
| 108 | |
| 109 | sc->tx99_skb = ath9k_build_tx99_skb(sc); |
| 110 | if (!sc->tx99_skb) |
| 111 | return -ENOMEM; |
| 112 | |
| 113 | memset(&txctl, 0, sizeof(txctl)); |
| 114 | txctl.txq = sc->tx.txq_map[IEEE80211_AC_VO]; |
| 115 | |
| 116 | ath_reset(sc); |
| 117 | |
| 118 | ath9k_ps_wakeup(sc); |
| 119 | |
| 120 | ath9k_hw_disable_interrupts(ah); |
| 121 | atomic_set(&ah->intr_ref_cnt, -1); |
| 122 | ath_drain_all_txq(sc); |
| 123 | ath_stoprecv(sc); |
| 124 | |
| 125 | sc->tx99_state = true; |
| 126 | |
| 127 | ieee80211_stop_queues(hw); |
| 128 | |
| 129 | if (sc->tx99_power == MAX_RATE_POWER + 1) |
| 130 | sc->tx99_power = MAX_RATE_POWER; |
| 131 | |
| 132 | ath9k_hw_tx99_set_txpower(ah, sc->tx99_power); |
| 133 | r = ath9k_tx99_send(sc, sc->tx99_skb, &txctl); |
| 134 | if (r) { |
| 135 | ath_dbg(common, XMIT, "Failed to xmit TX99 skb\n"); |
| 136 | return r; |
| 137 | } |
| 138 | |
| 139 | ath_dbg(common, XMIT, "TX99 xmit started using %d ( %ddBm)\n", |
| 140 | sc->tx99_power, |
| 141 | sc->tx99_power / 2); |
| 142 | |
| 143 | /* We leave the harware awake as it will be chugging on */ |
| 144 | |
| 145 | return 0; |
| 146 | } |
| 147 | |
| 148 | static ssize_t read_file_tx99(struct file *file, char __user *user_buf, |
| 149 | size_t count, loff_t *ppos) |
| 150 | { |
| 151 | struct ath_softc *sc = file->private_data; |
| 152 | char buf[3]; |
| 153 | unsigned int len; |
| 154 | |
| 155 | len = sprintf(buf, "%d\n", sc->tx99_state); |
| 156 | return simple_read_from_buffer(user_buf, count, ppos, buf, len); |
| 157 | } |
| 158 | |
| 159 | static ssize_t write_file_tx99(struct file *file, const char __user *user_buf, |
| 160 | size_t count, loff_t *ppos) |
| 161 | { |
| 162 | struct ath_softc *sc = file->private_data; |
| 163 | struct ath_common *common = ath9k_hw_common(sc->sc_ah); |
| 164 | char buf[32]; |
| 165 | bool start; |
| 166 | ssize_t len; |
| 167 | int r; |
| 168 | |
| 169 | if (sc->nvifs > 1) |
| 170 | return -EOPNOTSUPP; |
| 171 | |
| 172 | len = min(count, sizeof(buf) - 1); |
| 173 | if (copy_from_user(buf, user_buf, len)) |
| 174 | return -EFAULT; |
| 175 | |
| 176 | if (strtobool(buf, &start)) |
| 177 | return -EINVAL; |
| 178 | |
| 179 | if (start == sc->tx99_state) { |
| 180 | if (!start) |
| 181 | return count; |
| 182 | ath_dbg(common, XMIT, "Resetting TX99\n"); |
| 183 | ath9k_tx99_deinit(sc); |
| 184 | } |
| 185 | |
| 186 | if (!start) { |
| 187 | ath9k_tx99_deinit(sc); |
| 188 | return count; |
| 189 | } |
| 190 | |
| 191 | r = ath9k_tx99_init(sc); |
| 192 | if (r) |
| 193 | return r; |
| 194 | |
| 195 | return count; |
| 196 | } |
| 197 | |
| 198 | static const struct file_operations fops_tx99 = { |
| 199 | .read = read_file_tx99, |
| 200 | .write = write_file_tx99, |
| 201 | .open = simple_open, |
| 202 | .owner = THIS_MODULE, |
| 203 | .llseek = default_llseek, |
| 204 | }; |
| 205 | |
| 206 | static ssize_t read_file_tx99_power(struct file *file, |
| 207 | char __user *user_buf, |
| 208 | size_t count, loff_t *ppos) |
| 209 | { |
| 210 | struct ath_softc *sc = file->private_data; |
| 211 | char buf[32]; |
| 212 | unsigned int len; |
| 213 | |
| 214 | len = sprintf(buf, "%d (%d dBm)\n", |
| 215 | sc->tx99_power, |
| 216 | sc->tx99_power / 2); |
| 217 | |
| 218 | return simple_read_from_buffer(user_buf, count, ppos, buf, len); |
| 219 | } |
| 220 | |
| 221 | static ssize_t write_file_tx99_power(struct file *file, |
| 222 | const char __user *user_buf, |
| 223 | size_t count, loff_t *ppos) |
| 224 | { |
| 225 | struct ath_softc *sc = file->private_data; |
| 226 | int r; |
| 227 | u8 tx_power; |
| 228 | |
| 229 | r = kstrtou8_from_user(user_buf, count, 0, &tx_power); |
| 230 | if (r) |
| 231 | return r; |
| 232 | |
| 233 | if (tx_power > MAX_RATE_POWER) |
| 234 | return -EINVAL; |
| 235 | |
| 236 | sc->tx99_power = tx_power; |
| 237 | |
| 238 | ath9k_ps_wakeup(sc); |
| 239 | ath9k_hw_tx99_set_txpower(sc->sc_ah, sc->tx99_power); |
| 240 | ath9k_ps_restore(sc); |
| 241 | |
| 242 | return count; |
| 243 | } |
| 244 | |
| 245 | static const struct file_operations fops_tx99_power = { |
| 246 | .read = read_file_tx99_power, |
| 247 | .write = write_file_tx99_power, |
| 248 | .open = simple_open, |
| 249 | .owner = THIS_MODULE, |
| 250 | .llseek = default_llseek, |
| 251 | }; |
| 252 | |
| 253 | void ath9k_tx99_init_debug(struct ath_softc *sc) |
| 254 | { |
| 255 | if (!AR_SREV_9300_20_OR_LATER(sc->sc_ah)) |
| 256 | return; |
| 257 | |
| 258 | debugfs_create_file("tx99", S_IRUSR | S_IWUSR, |
| 259 | sc->debug.debugfs_phy, sc, |
| 260 | &fops_tx99); |
| 261 | debugfs_create_file("tx99_power", S_IRUSR | S_IWUSR, |
| 262 | sc->debug.debugfs_phy, sc, |
| 263 | &fops_tx99_power); |
| 264 | } |