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 "core.h" 19 #include "debug.h" 20 21 static void send_fft_sample(struct ath10k *ar, 22 const struct fft_sample_tlv *fft_sample_tlv) 23 { 24 int length; 25 26 if (!ar->spectral.rfs_chan_spec_scan) 27 return; 28 29 length = __be16_to_cpu(fft_sample_tlv->length) + 30 sizeof(*fft_sample_tlv); 31 relay_write(ar->spectral.rfs_chan_spec_scan, fft_sample_tlv, length); 32 } 33 34 static uint8_t get_max_exp(s8 max_index, u16 max_magnitude, size_t bin_len, 35 u8 *data) 36 { 37 int dc_pos; 38 u8 max_exp; 39 40 dc_pos = bin_len / 2; 41 42 /* peak index outside of bins */ 43 if (dc_pos < max_index || -dc_pos >= max_index) 44 return 0; 45 46 for (max_exp = 0; max_exp < 8; max_exp++) { 47 if (data[dc_pos + max_index] == (max_magnitude >> max_exp)) 48 break; 49 } 50 51 /* max_exp not found */ 52 if (data[dc_pos + max_index] != (max_magnitude >> max_exp)) 53 return 0; 54 55 return max_exp; 56 } 57 58 int ath10k_spectral_process_fft(struct ath10k *ar, 59 struct wmi_single_phyerr_rx_event *event, 60 struct phyerr_fft_report *fftr, 61 size_t bin_len, u64 tsf) 62 { 63 struct fft_sample_ath10k *fft_sample; 64 u8 buf[sizeof(*fft_sample) + SPECTRAL_ATH10K_MAX_NUM_BINS]; 65 u16 freq1, freq2, total_gain_db, base_pwr_db, length, peak_mag; 66 u32 reg0, reg1, nf_list1, nf_list2; 67 u8 chain_idx, *bins; 68 int dc_pos; 69 70 fft_sample = (struct fft_sample_ath10k *)&buf; 71 72 if (bin_len < 64 || bin_len > SPECTRAL_ATH10K_MAX_NUM_BINS) 73 return -EINVAL; 74 75 reg0 = __le32_to_cpu(fftr->reg0); 76 reg1 = __le32_to_cpu(fftr->reg1); 77 78 length = sizeof(*fft_sample) - sizeof(struct fft_sample_tlv) + bin_len; 79 fft_sample->tlv.type = ATH_FFT_SAMPLE_ATH10K; 80 fft_sample->tlv.length = __cpu_to_be16(length); 81 82 /* TODO: there might be a reason why the hardware reports 20/40/80 MHz, 83 * but the results/plots suggest that its actually 22/44/88 MHz. 84 */ 85 switch (event->hdr.chan_width_mhz) { 86 case 20: 87 fft_sample->chan_width_mhz = 22; 88 break; 89 case 40: 90 fft_sample->chan_width_mhz = 44; 91 break; 92 case 80: 93 /* TODO: As experiments with an analogue sender and various 94 * configuaritions (fft-sizes of 64/128/256 and 20/40/80 Mhz) 95 * show, the particular configuration of 80 MHz/64 bins does 96 * not match with the other smaples at all. Until the reason 97 * for that is found, don't report these samples. 98 */ 99 if (bin_len == 64) 100 return -EINVAL; 101 fft_sample->chan_width_mhz = 88; 102 break; 103 default: 104 fft_sample->chan_width_mhz = event->hdr.chan_width_mhz; 105 } 106 107 fft_sample->relpwr_db = MS(reg1, SEARCH_FFT_REPORT_REG1_RELPWR_DB); 108 fft_sample->avgpwr_db = MS(reg1, SEARCH_FFT_REPORT_REG1_AVGPWR_DB); 109 110 peak_mag = MS(reg1, SEARCH_FFT_REPORT_REG1_PEAK_MAG); 111 fft_sample->max_magnitude = __cpu_to_be16(peak_mag); 112 fft_sample->max_index = MS(reg0, SEARCH_FFT_REPORT_REG0_PEAK_SIDX); 113 fft_sample->rssi = event->hdr.rssi_combined; 114 115 total_gain_db = MS(reg0, SEARCH_FFT_REPORT_REG0_TOTAL_GAIN_DB); 116 base_pwr_db = MS(reg0, SEARCH_FFT_REPORT_REG0_BASE_PWR_DB); 117 fft_sample->total_gain_db = __cpu_to_be16(total_gain_db); 118 fft_sample->base_pwr_db = __cpu_to_be16(base_pwr_db); 119 120 freq1 = __le16_to_cpu(event->hdr.freq1); 121 freq2 = __le16_to_cpu(event->hdr.freq2); 122 fft_sample->freq1 = __cpu_to_be16(freq1); 123 fft_sample->freq2 = __cpu_to_be16(freq2); 124 125 nf_list1 = __le32_to_cpu(event->hdr.nf_list_1); 126 nf_list2 = __le32_to_cpu(event->hdr.nf_list_2); 127 chain_idx = MS(reg0, SEARCH_FFT_REPORT_REG0_FFT_CHN_IDX); 128 129 switch (chain_idx) { 130 case 0: 131 fft_sample->noise = __cpu_to_be16(nf_list1 & 0xffffu); 132 break; 133 case 1: 134 fft_sample->noise = __cpu_to_be16((nf_list1 >> 16) & 0xffffu); 135 break; 136 case 2: 137 fft_sample->noise = __cpu_to_be16(nf_list2 & 0xffffu); 138 break; 139 case 3: 140 fft_sample->noise = __cpu_to_be16((nf_list2 >> 16) & 0xffffu); 141 break; 142 } 143 144 bins = (u8 *)fftr; 145 bins += sizeof(*fftr); 146 147 fft_sample->tsf = __cpu_to_be64(tsf); 148 149 /* max_exp has been directly reported by previous hardware (ath9k), 150 * maybe its possible to get it by other means? 151 */ 152 fft_sample->max_exp = get_max_exp(fft_sample->max_index, peak_mag, 153 bin_len, bins); 154 155 memcpy(fft_sample->data, bins, bin_len); 156 157 /* DC value (value in the middle) is the blind spot of the spectral 158 * sample and invalid, interpolate it. 159 */ 160 dc_pos = bin_len / 2; 161 fft_sample->data[dc_pos] = (fft_sample->data[dc_pos + 1] + 162 fft_sample->data[dc_pos - 1]) / 2; 163 164 send_fft_sample(ar, &fft_sample->tlv); 165 166 return 0; 167 } 168 169 static struct ath10k_vif *ath10k_get_spectral_vdev(struct ath10k *ar) 170 { 171 struct ath10k_vif *arvif; 172 173 lockdep_assert_held(&ar->conf_mutex); 174 175 if (list_empty(&ar->arvifs)) 176 return NULL; 177 178 /* if there already is a vif doing spectral, return that. */ 179 list_for_each_entry(arvif, &ar->arvifs, list) 180 if (arvif->spectral_enabled) 181 return arvif; 182 183 /* otherwise, return the first vif. */ 184 return list_first_entry(&ar->arvifs, typeof(*arvif), list); 185 } 186 187 static int ath10k_spectral_scan_trigger(struct ath10k *ar) 188 { 189 struct ath10k_vif *arvif; 190 int res; 191 int vdev_id; 192 193 lockdep_assert_held(&ar->conf_mutex); 194 195 arvif = ath10k_get_spectral_vdev(ar); 196 if (!arvif) 197 return -ENODEV; 198 vdev_id = arvif->vdev_id; 199 200 if (ar->spectral.mode == SPECTRAL_DISABLED) 201 return 0; 202 203 res = ath10k_wmi_vdev_spectral_enable(ar, vdev_id, 204 WMI_SPECTRAL_TRIGGER_CMD_CLEAR, 205 WMI_SPECTRAL_ENABLE_CMD_ENABLE); 206 if (res < 0) 207 return res; 208 209 res = ath10k_wmi_vdev_spectral_enable(ar, vdev_id, 210 WMI_SPECTRAL_TRIGGER_CMD_TRIGGER, 211 WMI_SPECTRAL_ENABLE_CMD_ENABLE); 212 if (res < 0) 213 return res; 214 215 return 0; 216 } 217 218 static int ath10k_spectral_scan_config(struct ath10k *ar, 219 enum ath10k_spectral_mode mode) 220 { 221 struct wmi_vdev_spectral_conf_arg arg; 222 struct ath10k_vif *arvif; 223 int vdev_id, count, res = 0; 224 225 lockdep_assert_held(&ar->conf_mutex); 226 227 arvif = ath10k_get_spectral_vdev(ar); 228 if (!arvif) 229 return -ENODEV; 230 231 vdev_id = arvif->vdev_id; 232 233 arvif->spectral_enabled = (mode != SPECTRAL_DISABLED); 234 ar->spectral.mode = mode; 235 236 res = ath10k_wmi_vdev_spectral_enable(ar, vdev_id, 237 WMI_SPECTRAL_TRIGGER_CMD_CLEAR, 238 WMI_SPECTRAL_ENABLE_CMD_DISABLE); 239 if (res < 0) { 240 ath10k_warn("failed to enable spectral scan: %d\n", res); 241 return res; 242 } 243 244 if (mode == SPECTRAL_DISABLED) 245 return 0; 246 247 if (mode == SPECTRAL_BACKGROUND) 248 count = WMI_SPECTRAL_COUNT_DEFAULT; 249 else 250 count = max_t(u8, 1, ar->spectral.config.count); 251 252 arg.vdev_id = vdev_id; 253 arg.scan_count = count; 254 arg.scan_period = WMI_SPECTRAL_PERIOD_DEFAULT; 255 arg.scan_priority = WMI_SPECTRAL_PRIORITY_DEFAULT; 256 arg.scan_fft_size = ar->spectral.config.fft_size; 257 arg.scan_gc_ena = WMI_SPECTRAL_GC_ENA_DEFAULT; 258 arg.scan_restart_ena = WMI_SPECTRAL_RESTART_ENA_DEFAULT; 259 arg.scan_noise_floor_ref = WMI_SPECTRAL_NOISE_FLOOR_REF_DEFAULT; 260 arg.scan_init_delay = WMI_SPECTRAL_INIT_DELAY_DEFAULT; 261 arg.scan_nb_tone_thr = WMI_SPECTRAL_NB_TONE_THR_DEFAULT; 262 arg.scan_str_bin_thr = WMI_SPECTRAL_STR_BIN_THR_DEFAULT; 263 arg.scan_wb_rpt_mode = WMI_SPECTRAL_WB_RPT_MODE_DEFAULT; 264 arg.scan_rssi_rpt_mode = WMI_SPECTRAL_RSSI_RPT_MODE_DEFAULT; 265 arg.scan_rssi_thr = WMI_SPECTRAL_RSSI_THR_DEFAULT; 266 arg.scan_pwr_format = WMI_SPECTRAL_PWR_FORMAT_DEFAULT; 267 arg.scan_rpt_mode = WMI_SPECTRAL_RPT_MODE_DEFAULT; 268 arg.scan_bin_scale = WMI_SPECTRAL_BIN_SCALE_DEFAULT; 269 arg.scan_dbm_adj = WMI_SPECTRAL_DBM_ADJ_DEFAULT; 270 arg.scan_chn_mask = WMI_SPECTRAL_CHN_MASK_DEFAULT; 271 272 res = ath10k_wmi_vdev_spectral_conf(ar, &arg); 273 if (res < 0) { 274 ath10k_warn("failed to configure spectral scan: %d\n", res); 275 return res; 276 } 277 278 return 0; 279 } 280 281 static ssize_t read_file_spec_scan_ctl(struct file *file, char __user *user_buf, 282 size_t count, loff_t *ppos) 283 { 284 struct ath10k *ar = file->private_data; 285 char *mode = ""; 286 unsigned int len; 287 enum ath10k_spectral_mode spectral_mode; 288 289 mutex_lock(&ar->conf_mutex); 290 spectral_mode = ar->spectral.mode; 291 mutex_unlock(&ar->conf_mutex); 292 293 switch (spectral_mode) { 294 case SPECTRAL_DISABLED: 295 mode = "disable"; 296 break; 297 case SPECTRAL_BACKGROUND: 298 mode = "background"; 299 break; 300 case SPECTRAL_MANUAL: 301 mode = "manual"; 302 break; 303 } 304 305 len = strlen(mode); 306 return simple_read_from_buffer(user_buf, count, ppos, mode, len); 307 } 308 309 static ssize_t write_file_spec_scan_ctl(struct file *file, 310 const char __user *user_buf, 311 size_t count, loff_t *ppos) 312 { 313 struct ath10k *ar = file->private_data; 314 char buf[32]; 315 ssize_t len; 316 int res; 317 318 len = min(count, sizeof(buf) - 1); 319 if (copy_from_user(buf, user_buf, len)) 320 return -EFAULT; 321 322 buf[len] = '\0'; 323 324 mutex_lock(&ar->conf_mutex); 325 326 if (strncmp("trigger", buf, 7) == 0) { 327 if (ar->spectral.mode == SPECTRAL_MANUAL || 328 ar->spectral.mode == SPECTRAL_BACKGROUND) { 329 /* reset the configuration to adopt possibly changed 330 * debugfs parameters 331 */ 332 res = ath10k_spectral_scan_config(ar, 333 ar->spectral.mode); 334 if (res < 0) { 335 ath10k_warn("failed to reconfigure spectral scan: %d\n", 336 res); 337 } 338 res = ath10k_spectral_scan_trigger(ar); 339 if (res < 0) { 340 ath10k_warn("failed to trigger spectral scan: %d\n", 341 res); 342 } 343 } else { 344 res = -EINVAL; 345 } 346 } else if (strncmp("background", buf, 9) == 0) { 347 res = ath10k_spectral_scan_config(ar, SPECTRAL_BACKGROUND); 348 } else if (strncmp("manual", buf, 6) == 0) { 349 res = ath10k_spectral_scan_config(ar, SPECTRAL_MANUAL); 350 } else if (strncmp("disable", buf, 7) == 0) { 351 res = ath10k_spectral_scan_config(ar, SPECTRAL_DISABLED); 352 } else { 353 res = -EINVAL; 354 } 355 356 mutex_unlock(&ar->conf_mutex); 357 358 if (res < 0) 359 return res; 360 361 return count; 362 } 363 364 static const struct file_operations fops_spec_scan_ctl = { 365 .read = read_file_spec_scan_ctl, 366 .write = write_file_spec_scan_ctl, 367 .open = simple_open, 368 .owner = THIS_MODULE, 369 .llseek = default_llseek, 370 }; 371 372 static ssize_t read_file_spectral_count(struct file *file, 373 char __user *user_buf, 374 size_t count, loff_t *ppos) 375 { 376 struct ath10k *ar = file->private_data; 377 char buf[32]; 378 unsigned int len; 379 u8 spectral_count; 380 381 mutex_lock(&ar->conf_mutex); 382 spectral_count = ar->spectral.config.count; 383 mutex_unlock(&ar->conf_mutex); 384 385 len = sprintf(buf, "%d\n", spectral_count); 386 return simple_read_from_buffer(user_buf, count, ppos, buf, len); 387 } 388 389 static ssize_t write_file_spectral_count(struct file *file, 390 const char __user *user_buf, 391 size_t count, loff_t *ppos) 392 { 393 struct ath10k *ar = file->private_data; 394 unsigned long val; 395 char buf[32]; 396 ssize_t len; 397 398 len = min(count, sizeof(buf) - 1); 399 if (copy_from_user(buf, user_buf, len)) 400 return -EFAULT; 401 402 buf[len] = '\0'; 403 if (kstrtoul(buf, 0, &val)) 404 return -EINVAL; 405 406 if (val < 0 || val > 255) 407 return -EINVAL; 408 409 mutex_lock(&ar->conf_mutex); 410 ar->spectral.config.count = val; 411 mutex_unlock(&ar->conf_mutex); 412 413 return count; 414 } 415 416 static const struct file_operations fops_spectral_count = { 417 .read = read_file_spectral_count, 418 .write = write_file_spectral_count, 419 .open = simple_open, 420 .owner = THIS_MODULE, 421 .llseek = default_llseek, 422 }; 423 424 static ssize_t read_file_spectral_bins(struct file *file, 425 char __user *user_buf, 426 size_t count, loff_t *ppos) 427 { 428 struct ath10k *ar = file->private_data; 429 char buf[32]; 430 unsigned int len, bins, fft_size, bin_scale; 431 432 mutex_lock(&ar->conf_mutex); 433 434 fft_size = ar->spectral.config.fft_size; 435 bin_scale = WMI_SPECTRAL_BIN_SCALE_DEFAULT; 436 bins = 1 << (fft_size - bin_scale); 437 438 mutex_unlock(&ar->conf_mutex); 439 440 len = sprintf(buf, "%d\n", bins); 441 return simple_read_from_buffer(user_buf, count, ppos, buf, len); 442 } 443 444 static ssize_t write_file_spectral_bins(struct file *file, 445 const char __user *user_buf, 446 size_t count, loff_t *ppos) 447 { 448 struct ath10k *ar = file->private_data; 449 unsigned long val; 450 char buf[32]; 451 ssize_t len; 452 453 len = min(count, sizeof(buf) - 1); 454 if (copy_from_user(buf, user_buf, len)) 455 return -EFAULT; 456 457 buf[len] = '\0'; 458 if (kstrtoul(buf, 0, &val)) 459 return -EINVAL; 460 461 if (val < 64 || val > SPECTRAL_ATH10K_MAX_NUM_BINS) 462 return -EINVAL; 463 464 if (!is_power_of_2(val)) 465 return -EINVAL; 466 467 mutex_lock(&ar->conf_mutex); 468 ar->spectral.config.fft_size = ilog2(val); 469 ar->spectral.config.fft_size += WMI_SPECTRAL_BIN_SCALE_DEFAULT; 470 mutex_unlock(&ar->conf_mutex); 471 472 return count; 473 } 474 475 static const struct file_operations fops_spectral_bins = { 476 .read = read_file_spectral_bins, 477 .write = write_file_spectral_bins, 478 .open = simple_open, 479 .owner = THIS_MODULE, 480 .llseek = default_llseek, 481 }; 482 483 static struct dentry *create_buf_file_handler(const char *filename, 484 struct dentry *parent, 485 umode_t mode, 486 struct rchan_buf *buf, 487 int *is_global) 488 { 489 struct dentry *buf_file; 490 491 buf_file = debugfs_create_file(filename, mode, parent, buf, 492 &relay_file_operations); 493 *is_global = 1; 494 return buf_file; 495 } 496 497 static int remove_buf_file_handler(struct dentry *dentry) 498 { 499 debugfs_remove(dentry); 500 501 return 0; 502 } 503 504 static struct rchan_callbacks rfs_spec_scan_cb = { 505 .create_buf_file = create_buf_file_handler, 506 .remove_buf_file = remove_buf_file_handler, 507 }; 508 509 int ath10k_spectral_start(struct ath10k *ar) 510 { 511 struct ath10k_vif *arvif; 512 513 lockdep_assert_held(&ar->conf_mutex); 514 515 list_for_each_entry(arvif, &ar->arvifs, list) 516 arvif->spectral_enabled = 0; 517 518 ar->spectral.mode = SPECTRAL_DISABLED; 519 ar->spectral.config.count = WMI_SPECTRAL_COUNT_DEFAULT; 520 ar->spectral.config.fft_size = WMI_SPECTRAL_FFT_SIZE_DEFAULT; 521 522 return 0; 523 } 524 525 int ath10k_spectral_vif_stop(struct ath10k_vif *arvif) 526 { 527 if (!arvif->spectral_enabled) 528 return 0; 529 530 return ath10k_spectral_scan_config(arvif->ar, SPECTRAL_DISABLED); 531 } 532 533 int ath10k_spectral_create(struct ath10k *ar) 534 { 535 ar->spectral.rfs_chan_spec_scan = relay_open("spectral_scan", 536 ar->debug.debugfs_phy, 537 1024, 256, 538 &rfs_spec_scan_cb, NULL); 539 debugfs_create_file("spectral_scan_ctl", 540 S_IRUSR | S_IWUSR, 541 ar->debug.debugfs_phy, ar, 542 &fops_spec_scan_ctl); 543 debugfs_create_file("spectral_count", 544 S_IRUSR | S_IWUSR, 545 ar->debug.debugfs_phy, ar, 546 &fops_spectral_count); 547 debugfs_create_file("spectral_bins", 548 S_IRUSR | S_IWUSR, 549 ar->debug.debugfs_phy, ar, 550 &fops_spectral_bins); 551 552 return 0; 553 } 554 555 void ath10k_spectral_destroy(struct ath10k *ar) 556 { 557 if (ar->spectral.rfs_chan_spec_scan) { 558 relay_close(ar->spectral.rfs_chan_spec_scan); 559 ar->spectral.rfs_chan_spec_scan = NULL; 560 } 561 } 562