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 <linux/relay.h> 18 #include <linux/random.h> 19 #include "ath9k.h" 20 21 static s8 fix_rssi_inv_only(u8 rssi_val) 22 { 23 if (rssi_val == 128) 24 rssi_val = 0; 25 return (s8) rssi_val; 26 } 27 28 static void ath_debug_send_fft_sample(struct ath_spec_scan_priv *spec_priv, 29 struct fft_sample_tlv *fft_sample_tlv) 30 { 31 int length; 32 if (!spec_priv->rfs_chan_spec_scan) 33 return; 34 35 length = __be16_to_cpu(fft_sample_tlv->length) + 36 sizeof(*fft_sample_tlv); 37 relay_write(spec_priv->rfs_chan_spec_scan, fft_sample_tlv, length); 38 } 39 40 typedef int (ath_cmn_fft_idx_validator) (u8 *sample_end, int bytes_read); 41 42 static int 43 ath_cmn_max_idx_verify_ht20_fft(u8 *sample_end, int bytes_read) 44 { 45 struct ath_ht20_mag_info *mag_info; 46 u8 *sample; 47 u16 max_magnitude; 48 u8 max_index; 49 u8 max_exp; 50 51 /* Sanity check so that we don't read outside the read 52 * buffer 53 */ 54 if (bytes_read < SPECTRAL_HT20_SAMPLE_LEN - 1) 55 return -1; 56 57 mag_info = (struct ath_ht20_mag_info *) (sample_end - 58 sizeof(struct ath_ht20_mag_info) + 1); 59 60 sample = sample_end - SPECTRAL_HT20_SAMPLE_LEN + 1; 61 62 max_index = spectral_max_index_ht20(mag_info->all_bins); 63 max_magnitude = spectral_max_magnitude(mag_info->all_bins); 64 65 max_exp = mag_info->max_exp & 0xf; 66 67 /* Don't try to read something outside the read buffer 68 * in case of a missing byte (so bins[0] will be outside 69 * the read buffer) 70 */ 71 if (bytes_read < SPECTRAL_HT20_SAMPLE_LEN && max_index < 1) 72 return -1; 73 74 if ((sample[max_index] & 0xf8) != ((max_magnitude >> max_exp) & 0xf8)) 75 return -1; 76 else 77 return 0; 78 } 79 80 static int 81 ath_cmn_max_idx_verify_ht20_40_fft(u8 *sample_end, int bytes_read) 82 { 83 struct ath_ht20_40_mag_info *mag_info; 84 u8 *sample; 85 u16 lower_mag, upper_mag; 86 u8 lower_max_index, upper_max_index; 87 u8 max_exp; 88 int dc_pos = SPECTRAL_HT20_40_NUM_BINS / 2; 89 90 /* Sanity check so that we don't read outside the read 91 * buffer 92 */ 93 if (bytes_read < SPECTRAL_HT20_40_SAMPLE_LEN - 1) 94 return -1; 95 96 mag_info = (struct ath_ht20_40_mag_info *) (sample_end - 97 sizeof(struct ath_ht20_40_mag_info) + 1); 98 99 sample = sample_end - SPECTRAL_HT20_40_SAMPLE_LEN + 1; 100 101 lower_mag = spectral_max_magnitude(mag_info->lower_bins); 102 lower_max_index = spectral_max_index_ht40(mag_info->lower_bins); 103 104 upper_mag = spectral_max_magnitude(mag_info->upper_bins); 105 upper_max_index = spectral_max_index_ht40(mag_info->upper_bins); 106 107 max_exp = mag_info->max_exp & 0xf; 108 109 /* Don't try to read something outside the read buffer 110 * in case of a missing byte (so bins[0] will be outside 111 * the read buffer) 112 */ 113 if (bytes_read < SPECTRAL_HT20_40_SAMPLE_LEN && 114 ((upper_max_index < 1) || (lower_max_index < 1))) 115 return -1; 116 117 if (((sample[upper_max_index + dc_pos] & 0xf8) != 118 ((upper_mag >> max_exp) & 0xf8)) || 119 ((sample[lower_max_index] & 0xf8) != 120 ((lower_mag >> max_exp) & 0xf8))) 121 return -1; 122 else 123 return 0; 124 } 125 126 typedef int (ath_cmn_fft_sample_handler) (struct ath_rx_status *rs, 127 struct ath_spec_scan_priv *spec_priv, 128 u8 *sample_buf, u64 tsf, u16 freq, int chan_type); 129 130 static int 131 ath_cmn_process_ht20_fft(struct ath_rx_status *rs, 132 struct ath_spec_scan_priv *spec_priv, 133 u8 *sample_buf, 134 u64 tsf, u16 freq, int chan_type) 135 { 136 struct fft_sample_ht20 fft_sample_20; 137 struct ath_common *common = ath9k_hw_common(spec_priv->ah); 138 struct ath_hw *ah = spec_priv->ah; 139 struct ath_ht20_mag_info *mag_info; 140 struct fft_sample_tlv *tlv; 141 int i = 0; 142 int ret = 0; 143 int dc_pos = SPECTRAL_HT20_NUM_BINS / 2; 144 u16 magnitude, tmp_mag, length; 145 u8 max_index, bitmap_w, max_exp; 146 147 length = sizeof(fft_sample_20) - sizeof(struct fft_sample_tlv); 148 fft_sample_20.tlv.type = ATH_FFT_SAMPLE_HT20; 149 fft_sample_20.tlv.length = __cpu_to_be16(length); 150 fft_sample_20.freq = __cpu_to_be16(freq); 151 fft_sample_20.rssi = fix_rssi_inv_only(rs->rs_rssi_ctl[0]); 152 fft_sample_20.noise = ah->noise; 153 154 mag_info = (struct ath_ht20_mag_info *) (sample_buf + 155 SPECTRAL_HT20_NUM_BINS); 156 157 magnitude = spectral_max_magnitude(mag_info->all_bins); 158 fft_sample_20.max_magnitude = __cpu_to_be16(magnitude); 159 160 max_index = spectral_max_index_ht20(mag_info->all_bins); 161 fft_sample_20.max_index = max_index; 162 163 bitmap_w = spectral_bitmap_weight(mag_info->all_bins); 164 fft_sample_20.bitmap_weight = bitmap_w; 165 166 max_exp = mag_info->max_exp & 0xf; 167 fft_sample_20.max_exp = max_exp; 168 169 fft_sample_20.tsf = __cpu_to_be64(tsf); 170 171 memcpy(fft_sample_20.data, sample_buf, SPECTRAL_HT20_NUM_BINS); 172 173 ath_dbg(common, SPECTRAL_SCAN, "FFT HT20 frame: max mag 0x%X," 174 "max_mag_idx %i\n", 175 magnitude >> max_exp, 176 max_index); 177 178 if ((fft_sample_20.data[max_index] & 0xf8) != 179 ((magnitude >> max_exp) & 0xf8)) { 180 ath_dbg(common, SPECTRAL_SCAN, "Magnitude mismatch !\n"); 181 ret = -1; 182 } 183 184 /* DC value (value in the middle) is the blind spot of the spectral 185 * sample and invalid, interpolate it. 186 */ 187 fft_sample_20.data[dc_pos] = (fft_sample_20.data[dc_pos + 1] + 188 fft_sample_20.data[dc_pos - 1]) / 2; 189 190 /* Check if the maximum magnitude is indeed maximum, 191 * also if the maximum value was at dc_pos, calculate 192 * a new one (since value at dc_pos is invalid). 193 */ 194 if (max_index == dc_pos) { 195 tmp_mag = 0; 196 for (i = 0; i < dc_pos; i++) { 197 if (fft_sample_20.data[i] > tmp_mag) { 198 tmp_mag = fft_sample_20.data[i]; 199 fft_sample_20.max_index = i; 200 } 201 } 202 203 magnitude = tmp_mag << max_exp; 204 fft_sample_20.max_magnitude = __cpu_to_be16(magnitude); 205 206 ath_dbg(common, SPECTRAL_SCAN, 207 "Calculated new lower max 0x%X at %i\n", 208 tmp_mag, fft_sample_20.max_index); 209 } else 210 for (i = 0; i < SPECTRAL_HT20_NUM_BINS; i++) { 211 if (fft_sample_20.data[i] == (magnitude >> max_exp)) 212 ath_dbg(common, SPECTRAL_SCAN, 213 "Got max: 0x%X at index %i\n", 214 fft_sample_20.data[i], i); 215 216 if (fft_sample_20.data[i] > (magnitude >> max_exp)) { 217 ath_dbg(common, SPECTRAL_SCAN, 218 "Got bin %i greater than max: 0x%X\n", 219 i, fft_sample_20.data[i]); 220 ret = -1; 221 } 222 } 223 224 if (ret < 0) 225 return ret; 226 227 tlv = (struct fft_sample_tlv *)&fft_sample_20; 228 229 ath_debug_send_fft_sample(spec_priv, tlv); 230 231 return 0; 232 } 233 234 static int 235 ath_cmn_process_ht20_40_fft(struct ath_rx_status *rs, 236 struct ath_spec_scan_priv *spec_priv, 237 u8 *sample_buf, 238 u64 tsf, u16 freq, int chan_type) 239 { 240 struct fft_sample_ht20_40 fft_sample_40; 241 struct ath_common *common = ath9k_hw_common(spec_priv->ah); 242 struct ath_hw *ah = spec_priv->ah; 243 struct ath9k_hw_cal_data *caldata = ah->caldata; 244 struct ath_ht20_40_mag_info *mag_info; 245 struct fft_sample_tlv *tlv; 246 int dc_pos = SPECTRAL_HT20_40_NUM_BINS / 2; 247 int i = 0; 248 int ret = 0; 249 s16 ext_nf; 250 u16 lower_mag, upper_mag, tmp_mag, length; 251 s8 lower_rssi, upper_rssi; 252 u8 lower_max_index, upper_max_index; 253 u8 lower_bitmap_w, upper_bitmap_w, max_exp; 254 255 if (caldata) 256 ext_nf = ath9k_hw_getchan_noise(ah, ah->curchan, 257 caldata->nfCalHist[3].privNF); 258 else 259 ext_nf = ATH_DEFAULT_NOISE_FLOOR; 260 261 length = sizeof(fft_sample_40) - sizeof(struct fft_sample_tlv); 262 fft_sample_40.tlv.type = ATH_FFT_SAMPLE_HT20_40; 263 fft_sample_40.tlv.length = __cpu_to_be16(length); 264 fft_sample_40.freq = __cpu_to_be16(freq); 265 fft_sample_40.channel_type = chan_type; 266 267 if (chan_type == NL80211_CHAN_HT40PLUS) { 268 lower_rssi = fix_rssi_inv_only(rs->rs_rssi_ctl[0]); 269 upper_rssi = fix_rssi_inv_only(rs->rs_rssi_ext[0]); 270 271 fft_sample_40.lower_noise = ah->noise; 272 fft_sample_40.upper_noise = ext_nf; 273 } else { 274 lower_rssi = fix_rssi_inv_only(rs->rs_rssi_ext[0]); 275 upper_rssi = fix_rssi_inv_only(rs->rs_rssi_ctl[0]); 276 277 fft_sample_40.lower_noise = ext_nf; 278 fft_sample_40.upper_noise = ah->noise; 279 } 280 281 fft_sample_40.lower_rssi = lower_rssi; 282 fft_sample_40.upper_rssi = upper_rssi; 283 284 mag_info = (struct ath_ht20_40_mag_info *) (sample_buf + 285 SPECTRAL_HT20_40_NUM_BINS); 286 287 lower_mag = spectral_max_magnitude(mag_info->lower_bins); 288 fft_sample_40.lower_max_magnitude = __cpu_to_be16(lower_mag); 289 290 upper_mag = spectral_max_magnitude(mag_info->upper_bins); 291 fft_sample_40.upper_max_magnitude = __cpu_to_be16(upper_mag); 292 293 lower_max_index = spectral_max_index_ht40(mag_info->lower_bins); 294 fft_sample_40.lower_max_index = lower_max_index; 295 296 upper_max_index = spectral_max_index_ht40(mag_info->upper_bins); 297 fft_sample_40.upper_max_index = upper_max_index; 298 299 lower_bitmap_w = spectral_bitmap_weight(mag_info->lower_bins); 300 fft_sample_40.lower_bitmap_weight = lower_bitmap_w; 301 302 upper_bitmap_w = spectral_bitmap_weight(mag_info->upper_bins); 303 fft_sample_40.upper_bitmap_weight = upper_bitmap_w; 304 305 max_exp = mag_info->max_exp & 0xf; 306 fft_sample_40.max_exp = max_exp; 307 308 fft_sample_40.tsf = __cpu_to_be64(tsf); 309 310 memcpy(fft_sample_40.data, sample_buf, SPECTRAL_HT20_40_NUM_BINS); 311 312 ath_dbg(common, SPECTRAL_SCAN, "FFT HT20/40 frame: lower mag 0x%X," 313 "lower_mag_idx %i, upper mag 0x%X," 314 "upper_mag_idx %i\n", 315 lower_mag >> max_exp, 316 lower_max_index, 317 upper_mag >> max_exp, 318 upper_max_index); 319 320 /* Check if we got the expected magnitude values at 321 * the expected bins 322 */ 323 if (((fft_sample_40.data[upper_max_index + dc_pos] & 0xf8) 324 != ((upper_mag >> max_exp) & 0xf8)) || 325 ((fft_sample_40.data[lower_max_index] & 0xf8) 326 != ((lower_mag >> max_exp) & 0xf8))) { 327 ath_dbg(common, SPECTRAL_SCAN, "Magnitude mismatch !\n"); 328 ret = -1; 329 } 330 331 /* DC value (value in the middle) is the blind spot of the spectral 332 * sample and invalid, interpolate it. 333 */ 334 fft_sample_40.data[dc_pos] = (fft_sample_40.data[dc_pos + 1] + 335 fft_sample_40.data[dc_pos - 1]) / 2; 336 337 /* Check if the maximum magnitudes are indeed maximum, 338 * also if the maximum value was at dc_pos, calculate 339 * a new one (since value at dc_pos is invalid). 340 */ 341 if (lower_max_index == dc_pos) { 342 tmp_mag = 0; 343 for (i = 0; i < dc_pos; i++) { 344 if (fft_sample_40.data[i] > tmp_mag) { 345 tmp_mag = fft_sample_40.data[i]; 346 fft_sample_40.lower_max_index = i; 347 } 348 } 349 350 lower_mag = tmp_mag << max_exp; 351 fft_sample_40.lower_max_magnitude = __cpu_to_be16(lower_mag); 352 353 ath_dbg(common, SPECTRAL_SCAN, 354 "Calculated new lower max 0x%X at %i\n", 355 tmp_mag, fft_sample_40.lower_max_index); 356 } else 357 for (i = 0; i < dc_pos; i++) { 358 if (fft_sample_40.data[i] == (lower_mag >> max_exp)) 359 ath_dbg(common, SPECTRAL_SCAN, 360 "Got lower mag: 0x%X at index %i\n", 361 fft_sample_40.data[i], i); 362 363 if (fft_sample_40.data[i] > (lower_mag >> max_exp)) { 364 ath_dbg(common, SPECTRAL_SCAN, 365 "Got lower bin %i higher than max: 0x%X\n", 366 i, fft_sample_40.data[i]); 367 ret = -1; 368 } 369 } 370 371 if (upper_max_index == dc_pos) { 372 tmp_mag = 0; 373 for (i = dc_pos; i < SPECTRAL_HT20_40_NUM_BINS; i++) { 374 if (fft_sample_40.data[i] > tmp_mag) { 375 tmp_mag = fft_sample_40.data[i]; 376 fft_sample_40.upper_max_index = i; 377 } 378 } 379 upper_mag = tmp_mag << max_exp; 380 fft_sample_40.upper_max_magnitude = __cpu_to_be16(upper_mag); 381 382 ath_dbg(common, SPECTRAL_SCAN, 383 "Calculated new upper max 0x%X at %i\n", 384 tmp_mag, fft_sample_40.upper_max_index); 385 } else 386 for (i = dc_pos; i < SPECTRAL_HT20_40_NUM_BINS; i++) { 387 if (fft_sample_40.data[i] == (upper_mag >> max_exp)) 388 ath_dbg(common, SPECTRAL_SCAN, 389 "Got upper mag: 0x%X at index %i\n", 390 fft_sample_40.data[i], i); 391 392 if (fft_sample_40.data[i] > (upper_mag >> max_exp)) { 393 ath_dbg(common, SPECTRAL_SCAN, 394 "Got upper bin %i higher than max: 0x%X\n", 395 i, fft_sample_40.data[i]); 396 397 ret = -1; 398 } 399 } 400 401 if (ret < 0) 402 return ret; 403 404 tlv = (struct fft_sample_tlv *)&fft_sample_40; 405 406 ath_debug_send_fft_sample(spec_priv, tlv); 407 408 return 0; 409 } 410 411 static inline void 412 ath_cmn_copy_fft_frame(u8 *in, u8 *out, int sample_len, int sample_bytes) 413 { 414 switch (sample_bytes - sample_len) { 415 case -1: 416 /* First byte missing */ 417 memcpy(&out[1], in, 418 sample_len - 1); 419 break; 420 case 0: 421 /* Length correct, nothing to do. */ 422 memcpy(out, in, sample_len); 423 break; 424 case 1: 425 /* MAC added 2 extra bytes AND first byte 426 * is missing. 427 */ 428 memcpy(&out[1], in, 30); 429 out[31] = in[31]; 430 memcpy(&out[32], &in[33], 431 sample_len - 32); 432 break; 433 case 2: 434 /* MAC added 2 extra bytes at bin 30 and 32, 435 * remove them. 436 */ 437 memcpy(out, in, 30); 438 out[30] = in[31]; 439 memcpy(&out[31], &in[33], 440 sample_len - 31); 441 break; 442 default: 443 break; 444 } 445 } 446 447 static int 448 ath_cmn_is_fft_buf_full(struct ath_spec_scan_priv *spec_priv) 449 { 450 int i = 0; 451 int ret = 0; 452 struct rchan_buf *buf; 453 struct rchan *rc = spec_priv->rfs_chan_spec_scan; 454 455 for_each_possible_cpu(i) { 456 if ((buf = *per_cpu_ptr(rc->buf, i))) { 457 ret += relay_buf_full(buf); 458 } 459 } 460 461 if (ret) 462 return 1; 463 else 464 return 0; 465 } 466 467 /* returns 1 if this was a spectral frame, even if not handled. */ 468 int ath_cmn_process_fft(struct ath_spec_scan_priv *spec_priv, struct ieee80211_hdr *hdr, 469 struct ath_rx_status *rs, u64 tsf) 470 { 471 u8 sample_buf[SPECTRAL_SAMPLE_MAX_LEN] = {0}; 472 struct ath_hw *ah = spec_priv->ah; 473 struct ath_common *common = ath9k_hw_common(spec_priv->ah); 474 struct ath_softc *sc = (struct ath_softc *)common->priv; 475 u8 num_bins, *vdata = (u8 *)hdr; 476 struct ath_radar_info *radar_info; 477 int len = rs->rs_datalen; 478 int i; 479 int got_slen = 0; 480 u8 *sample_start; 481 int sample_bytes = 0; 482 int ret = 0; 483 u16 fft_len, sample_len, freq = ah->curchan->chan->center_freq; 484 enum nl80211_channel_type chan_type; 485 ath_cmn_fft_idx_validator *fft_idx_validator; 486 ath_cmn_fft_sample_handler *fft_handler; 487 488 /* AR9280 and before report via ATH9K_PHYERR_RADAR, AR93xx and newer 489 * via ATH9K_PHYERR_SPECTRAL. Haven't seen ATH9K_PHYERR_FALSE_RADAR_EXT 490 * yet, but this is supposed to be possible as well. 491 */ 492 if (rs->rs_phyerr != ATH9K_PHYERR_RADAR && 493 rs->rs_phyerr != ATH9K_PHYERR_FALSE_RADAR_EXT && 494 rs->rs_phyerr != ATH9K_PHYERR_SPECTRAL) 495 return 0; 496 497 /* check if spectral scan bit is set. This does not have to be checked 498 * if received through a SPECTRAL phy error, but shouldn't hurt. 499 */ 500 radar_info = ((struct ath_radar_info *)&vdata[len]) - 1; 501 if (!(radar_info->pulse_bw_info & SPECTRAL_SCAN_BITMASK)) 502 return 0; 503 504 if (!spec_priv->rfs_chan_spec_scan) 505 return 1; 506 507 /* Output buffers are full, no need to process anything 508 * since there is no space to put the result anyway 509 */ 510 ret = ath_cmn_is_fft_buf_full(spec_priv); 511 if (ret == 1) { 512 ath_dbg(common, SPECTRAL_SCAN, "FFT report ignored, no space " 513 "left on output buffers\n"); 514 return 1; 515 } 516 517 chan_type = cfg80211_get_chandef_type(&common->hw->conf.chandef); 518 if ((chan_type == NL80211_CHAN_HT40MINUS) || 519 (chan_type == NL80211_CHAN_HT40PLUS)) { 520 fft_len = SPECTRAL_HT20_40_TOTAL_DATA_LEN; 521 sample_len = SPECTRAL_HT20_40_SAMPLE_LEN; 522 num_bins = SPECTRAL_HT20_40_NUM_BINS; 523 fft_idx_validator = &ath_cmn_max_idx_verify_ht20_40_fft; 524 fft_handler = &ath_cmn_process_ht20_40_fft; 525 } else { 526 fft_len = SPECTRAL_HT20_TOTAL_DATA_LEN; 527 sample_len = SPECTRAL_HT20_SAMPLE_LEN; 528 num_bins = SPECTRAL_HT20_NUM_BINS; 529 fft_idx_validator = ath_cmn_max_idx_verify_ht20_fft; 530 fft_handler = &ath_cmn_process_ht20_fft; 531 } 532 533 ath_dbg(common, SPECTRAL_SCAN, "Got radar dump bw_info: 0x%X," 534 "len: %i fft_len: %i\n", 535 radar_info->pulse_bw_info, 536 len, 537 fft_len); 538 sample_start = vdata; 539 for (i = 0; i < len - 2; i++) { 540 sample_bytes++; 541 542 /* Only a single sample received, no need to look 543 * for the sample's end, do the correction based 544 * on the packet's length instead. Note that hw 545 * will always put the radar_info structure on 546 * the end. 547 */ 548 if (len <= fft_len + 2) { 549 sample_bytes = len - sizeof(struct ath_radar_info); 550 got_slen = 1; 551 } 552 553 /* Search for the end of the FFT frame between 554 * sample_len - 1 and sample_len + 2. exp_max is 3 555 * bits long and it's the only value on the last 556 * byte of the frame so since it'll be smaller than 557 * the next byte (the first bin of the next sample) 558 * 90% of the time, we can use it as a separator. 559 */ 560 if (vdata[i] <= 0x7 && sample_bytes >= sample_len - 1) { 561 562 /* Got a frame length within boundaries, there are 563 * four scenarios here: 564 * 565 * a) sample_len -> We got the correct length 566 * b) sample_len + 2 -> 2 bytes added around bin[31] 567 * c) sample_len - 1 -> The first byte is missing 568 * d) sample_len + 1 -> b + c at the same time 569 * 570 * When MAC adds 2 extra bytes, bin[31] and bin[32] 571 * have the same value, so we can use that for further 572 * verification in cases b and d. 573 */ 574 575 /* Did we go too far ? If so we couldn't determine 576 * this sample's boundaries, discard any further 577 * data 578 */ 579 if ((sample_bytes > sample_len + 2) || 580 ((sample_bytes > sample_len) && 581 (sample_start[31] != sample_start[32]))) 582 break; 583 584 /* See if we got a valid frame by checking the 585 * consistency of mag_info fields. This is to 586 * prevent from "fixing" a correct frame. 587 * Failure is non-fatal, later frames may 588 * be valid. 589 */ 590 if (!fft_idx_validator(&vdata[i], i)) { 591 ath_dbg(common, SPECTRAL_SCAN, 592 "Found valid fft frame at %i\n", i); 593 got_slen = 1; 594 } 595 596 /* We expect 1 - 2 more bytes */ 597 else if ((sample_start[31] == sample_start[32]) && 598 (sample_bytes >= sample_len) && 599 (sample_bytes < sample_len + 2) && 600 (vdata[i + 1] <= 0x7)) 601 continue; 602 603 /* Try to distinguish cases a and c */ 604 else if ((sample_bytes == sample_len - 1) && 605 (vdata[i + 1] <= 0x7)) 606 continue; 607 608 got_slen = 1; 609 } 610 611 if (got_slen) { 612 ath_dbg(common, SPECTRAL_SCAN, "FFT frame len: %i\n", 613 sample_bytes); 614 615 /* Only try to fix a frame if it's the only one 616 * on the report, else just skip it. 617 */ 618 if (sample_bytes != sample_len && len <= fft_len + 2) { 619 ath_cmn_copy_fft_frame(sample_start, 620 sample_buf, sample_len, 621 sample_bytes); 622 623 ret = fft_handler(rs, spec_priv, sample_buf, 624 tsf, freq, chan_type); 625 626 if (ret == 0) 627 RX_STAT_INC(sc, rx_spectral_sample_good); 628 else 629 RX_STAT_INC(sc, rx_spectral_sample_err); 630 631 memset(sample_buf, 0, SPECTRAL_SAMPLE_MAX_LEN); 632 633 /* Mix the received bins to the /dev/random 634 * pool 635 */ 636 add_device_randomness(sample_buf, num_bins); 637 } 638 639 /* Process a normal frame */ 640 if (sample_bytes == sample_len) { 641 ret = fft_handler(rs, spec_priv, sample_start, 642 tsf, freq, chan_type); 643 644 if (ret == 0) 645 RX_STAT_INC(sc, rx_spectral_sample_good); 646 else 647 RX_STAT_INC(sc, rx_spectral_sample_err); 648 649 /* Mix the received bins to the /dev/random 650 * pool 651 */ 652 add_device_randomness(sample_start, num_bins); 653 } 654 655 /* Short report processed, break out of the 656 * loop. 657 */ 658 if (len <= fft_len + 2) 659 return 1; 660 661 sample_start = &vdata[i + 1]; 662 663 /* -1 to grab sample_len -1, -2 since 664 * they 'll get increased by one. In case 665 * of failure try to recover by going byte 666 * by byte instead. 667 */ 668 if (ret == 0) { 669 i += num_bins - 2; 670 sample_bytes = num_bins - 2; 671 } 672 got_slen = 0; 673 } 674 } 675 676 i -= num_bins - 2; 677 if (len - i != sizeof(struct ath_radar_info)) 678 ath_dbg(common, SPECTRAL_SCAN, "FFT report truncated" 679 "(bytes left: %i)\n", 680 len - i); 681 return 1; 682 } 683 EXPORT_SYMBOL(ath_cmn_process_fft); 684 685 /*********************/ 686 /* spectral_scan_ctl */ 687 /*********************/ 688 689 static ssize_t read_file_spec_scan_ctl(struct file *file, char __user *user_buf, 690 size_t count, loff_t *ppos) 691 { 692 struct ath_spec_scan_priv *spec_priv = file->private_data; 693 char *mode = ""; 694 unsigned int len; 695 696 switch (spec_priv->spectral_mode) { 697 case SPECTRAL_DISABLED: 698 mode = "disable"; 699 break; 700 case SPECTRAL_BACKGROUND: 701 mode = "background"; 702 break; 703 case SPECTRAL_CHANSCAN: 704 mode = "chanscan"; 705 break; 706 case SPECTRAL_MANUAL: 707 mode = "manual"; 708 break; 709 } 710 len = strlen(mode); 711 return simple_read_from_buffer(user_buf, count, ppos, mode, len); 712 } 713 714 void ath9k_cmn_spectral_scan_trigger(struct ath_common *common, 715 struct ath_spec_scan_priv *spec_priv) 716 { 717 struct ath_hw *ah = spec_priv->ah; 718 u32 rxfilter; 719 720 if (IS_ENABLED(CONFIG_ATH9K_TX99)) 721 return; 722 723 if (!ath9k_hw_ops(ah)->spectral_scan_trigger) { 724 ath_err(common, "spectrum analyzer not implemented on this hardware\n"); 725 return; 726 } 727 728 if (!spec_priv->spec_config.enabled) 729 return; 730 731 ath_ps_ops(common)->wakeup(common); 732 rxfilter = ath9k_hw_getrxfilter(ah); 733 ath9k_hw_setrxfilter(ah, rxfilter | 734 ATH9K_RX_FILTER_PHYRADAR | 735 ATH9K_RX_FILTER_PHYERR); 736 737 /* TODO: usually this should not be neccesary, but for some reason 738 * (or in some mode?) the trigger must be called after the 739 * configuration, otherwise the register will have its values reset 740 * (on my ar9220 to value 0x01002310) 741 */ 742 ath9k_cmn_spectral_scan_config(common, spec_priv, spec_priv->spectral_mode); 743 ath9k_hw_ops(ah)->spectral_scan_trigger(ah); 744 ath_ps_ops(common)->restore(common); 745 } 746 EXPORT_SYMBOL(ath9k_cmn_spectral_scan_trigger); 747 748 int ath9k_cmn_spectral_scan_config(struct ath_common *common, 749 struct ath_spec_scan_priv *spec_priv, 750 enum spectral_mode spectral_mode) 751 { 752 struct ath_hw *ah = spec_priv->ah; 753 754 if (!ath9k_hw_ops(ah)->spectral_scan_trigger) { 755 ath_err(common, "spectrum analyzer not implemented on this hardware\n"); 756 return -1; 757 } 758 759 switch (spectral_mode) { 760 case SPECTRAL_DISABLED: 761 spec_priv->spec_config.enabled = 0; 762 break; 763 case SPECTRAL_BACKGROUND: 764 /* send endless samples. 765 * TODO: is this really useful for "background"? 766 */ 767 spec_priv->spec_config.endless = 1; 768 spec_priv->spec_config.enabled = 1; 769 break; 770 case SPECTRAL_CHANSCAN: 771 case SPECTRAL_MANUAL: 772 spec_priv->spec_config.endless = 0; 773 spec_priv->spec_config.enabled = 1; 774 break; 775 default: 776 return -1; 777 } 778 779 ath_ps_ops(common)->wakeup(common); 780 ath9k_hw_ops(ah)->spectral_scan_config(ah, &spec_priv->spec_config); 781 ath_ps_ops(common)->restore(common); 782 783 spec_priv->spectral_mode = spectral_mode; 784 785 return 0; 786 } 787 EXPORT_SYMBOL(ath9k_cmn_spectral_scan_config); 788 789 static ssize_t write_file_spec_scan_ctl(struct file *file, 790 const char __user *user_buf, 791 size_t count, loff_t *ppos) 792 { 793 struct ath_spec_scan_priv *spec_priv = file->private_data; 794 struct ath_common *common = ath9k_hw_common(spec_priv->ah); 795 char buf[32]; 796 ssize_t len; 797 798 if (IS_ENABLED(CONFIG_ATH9K_TX99)) 799 return -EOPNOTSUPP; 800 801 len = min(count, sizeof(buf) - 1); 802 if (copy_from_user(buf, user_buf, len)) 803 return -EFAULT; 804 805 buf[len] = '\0'; 806 807 if (strncmp("trigger", buf, 7) == 0) { 808 ath9k_cmn_spectral_scan_trigger(common, spec_priv); 809 } else if (strncmp("background", buf, 10) == 0) { 810 ath9k_cmn_spectral_scan_config(common, spec_priv, SPECTRAL_BACKGROUND); 811 ath_dbg(common, CONFIG, "spectral scan: background mode enabled\n"); 812 } else if (strncmp("chanscan", buf, 8) == 0) { 813 ath9k_cmn_spectral_scan_config(common, spec_priv, SPECTRAL_CHANSCAN); 814 ath_dbg(common, CONFIG, "spectral scan: channel scan mode enabled\n"); 815 } else if (strncmp("manual", buf, 6) == 0) { 816 ath9k_cmn_spectral_scan_config(common, spec_priv, SPECTRAL_MANUAL); 817 ath_dbg(common, CONFIG, "spectral scan: manual mode enabled\n"); 818 } else if (strncmp("disable", buf, 7) == 0) { 819 ath9k_cmn_spectral_scan_config(common, spec_priv, SPECTRAL_DISABLED); 820 ath_dbg(common, CONFIG, "spectral scan: disabled\n"); 821 } else { 822 return -EINVAL; 823 } 824 825 return count; 826 } 827 828 static const struct file_operations fops_spec_scan_ctl = { 829 .read = read_file_spec_scan_ctl, 830 .write = write_file_spec_scan_ctl, 831 .open = simple_open, 832 .owner = THIS_MODULE, 833 .llseek = default_llseek, 834 }; 835 836 /*************************/ 837 /* spectral_short_repeat */ 838 /*************************/ 839 840 static ssize_t read_file_spectral_short_repeat(struct file *file, 841 char __user *user_buf, 842 size_t count, loff_t *ppos) 843 { 844 struct ath_spec_scan_priv *spec_priv = file->private_data; 845 char buf[32]; 846 unsigned int len; 847 848 len = sprintf(buf, "%d\n", spec_priv->spec_config.short_repeat); 849 return simple_read_from_buffer(user_buf, count, ppos, buf, len); 850 } 851 852 static ssize_t write_file_spectral_short_repeat(struct file *file, 853 const char __user *user_buf, 854 size_t count, loff_t *ppos) 855 { 856 struct ath_spec_scan_priv *spec_priv = file->private_data; 857 unsigned long val; 858 char buf[32]; 859 ssize_t len; 860 861 len = min(count, sizeof(buf) - 1); 862 if (copy_from_user(buf, user_buf, len)) 863 return -EFAULT; 864 865 buf[len] = '\0'; 866 if (kstrtoul(buf, 0, &val)) 867 return -EINVAL; 868 869 if (val > 1) 870 return -EINVAL; 871 872 spec_priv->spec_config.short_repeat = val; 873 return count; 874 } 875 876 static const struct file_operations fops_spectral_short_repeat = { 877 .read = read_file_spectral_short_repeat, 878 .write = write_file_spectral_short_repeat, 879 .open = simple_open, 880 .owner = THIS_MODULE, 881 .llseek = default_llseek, 882 }; 883 884 /******************/ 885 /* spectral_count */ 886 /******************/ 887 888 static ssize_t read_file_spectral_count(struct file *file, 889 char __user *user_buf, 890 size_t count, loff_t *ppos) 891 { 892 struct ath_spec_scan_priv *spec_priv = file->private_data; 893 char buf[32]; 894 unsigned int len; 895 896 len = sprintf(buf, "%d\n", spec_priv->spec_config.count); 897 return simple_read_from_buffer(user_buf, count, ppos, buf, len); 898 } 899 900 static ssize_t write_file_spectral_count(struct file *file, 901 const char __user *user_buf, 902 size_t count, loff_t *ppos) 903 { 904 struct ath_spec_scan_priv *spec_priv = file->private_data; 905 unsigned long val; 906 char buf[32]; 907 ssize_t len; 908 909 len = min(count, sizeof(buf) - 1); 910 if (copy_from_user(buf, user_buf, len)) 911 return -EFAULT; 912 913 buf[len] = '\0'; 914 if (kstrtoul(buf, 0, &val)) 915 return -EINVAL; 916 917 if (val > 255) 918 return -EINVAL; 919 920 spec_priv->spec_config.count = val; 921 return count; 922 } 923 924 static const struct file_operations fops_spectral_count = { 925 .read = read_file_spectral_count, 926 .write = write_file_spectral_count, 927 .open = simple_open, 928 .owner = THIS_MODULE, 929 .llseek = default_llseek, 930 }; 931 932 /*******************/ 933 /* spectral_period */ 934 /*******************/ 935 936 static ssize_t read_file_spectral_period(struct file *file, 937 char __user *user_buf, 938 size_t count, loff_t *ppos) 939 { 940 struct ath_spec_scan_priv *spec_priv = file->private_data; 941 char buf[32]; 942 unsigned int len; 943 944 len = sprintf(buf, "%d\n", spec_priv->spec_config.period); 945 return simple_read_from_buffer(user_buf, count, ppos, buf, len); 946 } 947 948 static ssize_t write_file_spectral_period(struct file *file, 949 const char __user *user_buf, 950 size_t count, loff_t *ppos) 951 { 952 struct ath_spec_scan_priv *spec_priv = file->private_data; 953 unsigned long val; 954 char buf[32]; 955 ssize_t len; 956 957 len = min(count, sizeof(buf) - 1); 958 if (copy_from_user(buf, user_buf, len)) 959 return -EFAULT; 960 961 buf[len] = '\0'; 962 if (kstrtoul(buf, 0, &val)) 963 return -EINVAL; 964 965 if (val > 255) 966 return -EINVAL; 967 968 spec_priv->spec_config.period = val; 969 return count; 970 } 971 972 static const struct file_operations fops_spectral_period = { 973 .read = read_file_spectral_period, 974 .write = write_file_spectral_period, 975 .open = simple_open, 976 .owner = THIS_MODULE, 977 .llseek = default_llseek, 978 }; 979 980 /***********************/ 981 /* spectral_fft_period */ 982 /***********************/ 983 984 static ssize_t read_file_spectral_fft_period(struct file *file, 985 char __user *user_buf, 986 size_t count, loff_t *ppos) 987 { 988 struct ath_spec_scan_priv *spec_priv = file->private_data; 989 char buf[32]; 990 unsigned int len; 991 992 len = sprintf(buf, "%d\n", spec_priv->spec_config.fft_period); 993 return simple_read_from_buffer(user_buf, count, ppos, buf, len); 994 } 995 996 static ssize_t write_file_spectral_fft_period(struct file *file, 997 const char __user *user_buf, 998 size_t count, loff_t *ppos) 999 { 1000 struct ath_spec_scan_priv *spec_priv = file->private_data; 1001 unsigned long val; 1002 char buf[32]; 1003 ssize_t len; 1004 1005 len = min(count, sizeof(buf) - 1); 1006 if (copy_from_user(buf, user_buf, len)) 1007 return -EFAULT; 1008 1009 buf[len] = '\0'; 1010 if (kstrtoul(buf, 0, &val)) 1011 return -EINVAL; 1012 1013 if (val > 15) 1014 return -EINVAL; 1015 1016 spec_priv->spec_config.fft_period = val; 1017 return count; 1018 } 1019 1020 static const struct file_operations fops_spectral_fft_period = { 1021 .read = read_file_spectral_fft_period, 1022 .write = write_file_spectral_fft_period, 1023 .open = simple_open, 1024 .owner = THIS_MODULE, 1025 .llseek = default_llseek, 1026 }; 1027 1028 /*******************/ 1029 /* Relay interface */ 1030 /*******************/ 1031 1032 static struct dentry *create_buf_file_handler(const char *filename, 1033 struct dentry *parent, 1034 umode_t mode, 1035 struct rchan_buf *buf, 1036 int *is_global) 1037 { 1038 struct dentry *buf_file; 1039 1040 buf_file = debugfs_create_file(filename, mode, parent, buf, 1041 &relay_file_operations); 1042 if (IS_ERR(buf_file)) 1043 return NULL; 1044 1045 *is_global = 1; 1046 return buf_file; 1047 } 1048 1049 static int remove_buf_file_handler(struct dentry *dentry) 1050 { 1051 debugfs_remove(dentry); 1052 1053 return 0; 1054 } 1055 1056 static struct rchan_callbacks rfs_spec_scan_cb = { 1057 .create_buf_file = create_buf_file_handler, 1058 .remove_buf_file = remove_buf_file_handler, 1059 }; 1060 1061 /*********************/ 1062 /* Debug Init/Deinit */ 1063 /*********************/ 1064 1065 void ath9k_cmn_spectral_deinit_debug(struct ath_spec_scan_priv *spec_priv) 1066 { 1067 if (spec_priv->rfs_chan_spec_scan) { 1068 relay_close(spec_priv->rfs_chan_spec_scan); 1069 spec_priv->rfs_chan_spec_scan = NULL; 1070 } 1071 } 1072 EXPORT_SYMBOL(ath9k_cmn_spectral_deinit_debug); 1073 1074 void ath9k_cmn_spectral_init_debug(struct ath_spec_scan_priv *spec_priv, 1075 struct dentry *debugfs_phy) 1076 { 1077 spec_priv->rfs_chan_spec_scan = relay_open("spectral_scan", 1078 debugfs_phy, 1079 1024, 256, &rfs_spec_scan_cb, 1080 NULL); 1081 if (!spec_priv->rfs_chan_spec_scan) 1082 return; 1083 1084 debugfs_create_file("spectral_scan_ctl", 1085 0600, 1086 debugfs_phy, spec_priv, 1087 &fops_spec_scan_ctl); 1088 debugfs_create_file("spectral_short_repeat", 1089 0600, 1090 debugfs_phy, spec_priv, 1091 &fops_spectral_short_repeat); 1092 debugfs_create_file("spectral_count", 1093 0600, 1094 debugfs_phy, spec_priv, 1095 &fops_spectral_count); 1096 debugfs_create_file("spectral_period", 1097 0600, 1098 debugfs_phy, spec_priv, 1099 &fops_spectral_period); 1100 debugfs_create_file("spectral_fft_period", 1101 0600, 1102 debugfs_phy, spec_priv, 1103 &fops_spectral_fft_period); 1104 } 1105 EXPORT_SYMBOL(ath9k_cmn_spectral_init_debug); 1106