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 const struct wmi_phyerr *phyerr, 60 const 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; 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 (phyerr->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 = phyerr->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 = phyerr->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(phyerr->freq1); 121 freq2 = __le16_to_cpu(phyerr->freq2); 122 fft_sample->freq1 = __cpu_to_be16(freq1); 123 fft_sample->freq2 = __cpu_to_be16(freq2); 124 125 chain_idx = MS(reg0, SEARCH_FFT_REPORT_REG0_FFT_CHN_IDX); 126 127 fft_sample->noise = __cpu_to_be16( 128 __le16_to_cpu(phyerr->nf_chains[chain_idx])); 129 130 bins = (u8 *)fftr; 131 bins += sizeof(*fftr); 132 133 fft_sample->tsf = __cpu_to_be64(tsf); 134 135 /* max_exp has been directly reported by previous hardware (ath9k), 136 * maybe its possible to get it by other means? 137 */ 138 fft_sample->max_exp = get_max_exp(fft_sample->max_index, peak_mag, 139 bin_len, bins); 140 141 memcpy(fft_sample->data, bins, bin_len); 142 143 /* DC value (value in the middle) is the blind spot of the spectral 144 * sample and invalid, interpolate it. 145 */ 146 dc_pos = bin_len / 2; 147 fft_sample->data[dc_pos] = (fft_sample->data[dc_pos + 1] + 148 fft_sample->data[dc_pos - 1]) / 2; 149 150 send_fft_sample(ar, &fft_sample->tlv); 151 152 return 0; 153 } 154 155 static struct ath10k_vif *ath10k_get_spectral_vdev(struct ath10k *ar) 156 { 157 struct ath10k_vif *arvif; 158 159 lockdep_assert_held(&ar->conf_mutex); 160 161 if (list_empty(&ar->arvifs)) 162 return NULL; 163 164 /* if there already is a vif doing spectral, return that. */ 165 list_for_each_entry(arvif, &ar->arvifs, list) 166 if (arvif->spectral_enabled) 167 return arvif; 168 169 /* otherwise, return the first vif. */ 170 return list_first_entry(&ar->arvifs, typeof(*arvif), list); 171 } 172 173 static int ath10k_spectral_scan_trigger(struct ath10k *ar) 174 { 175 struct ath10k_vif *arvif; 176 int res; 177 int vdev_id; 178 179 lockdep_assert_held(&ar->conf_mutex); 180 181 arvif = ath10k_get_spectral_vdev(ar); 182 if (!arvif) 183 return -ENODEV; 184 vdev_id = arvif->vdev_id; 185 186 if (ar->spectral.mode == SPECTRAL_DISABLED) 187 return 0; 188 189 res = ath10k_wmi_vdev_spectral_enable(ar, vdev_id, 190 WMI_SPECTRAL_TRIGGER_CMD_CLEAR, 191 WMI_SPECTRAL_ENABLE_CMD_ENABLE); 192 if (res < 0) 193 return res; 194 195 res = ath10k_wmi_vdev_spectral_enable(ar, vdev_id, 196 WMI_SPECTRAL_TRIGGER_CMD_TRIGGER, 197 WMI_SPECTRAL_ENABLE_CMD_ENABLE); 198 if (res < 0) 199 return res; 200 201 return 0; 202 } 203 204 static int ath10k_spectral_scan_config(struct ath10k *ar, 205 enum ath10k_spectral_mode mode) 206 { 207 struct wmi_vdev_spectral_conf_arg arg; 208 struct ath10k_vif *arvif; 209 int vdev_id, count, res = 0; 210 211 lockdep_assert_held(&ar->conf_mutex); 212 213 arvif = ath10k_get_spectral_vdev(ar); 214 if (!arvif) 215 return -ENODEV; 216 217 vdev_id = arvif->vdev_id; 218 219 arvif->spectral_enabled = (mode != SPECTRAL_DISABLED); 220 ar->spectral.mode = mode; 221 222 res = ath10k_wmi_vdev_spectral_enable(ar, vdev_id, 223 WMI_SPECTRAL_TRIGGER_CMD_CLEAR, 224 WMI_SPECTRAL_ENABLE_CMD_DISABLE); 225 if (res < 0) { 226 ath10k_warn(ar, "failed to enable spectral scan: %d\n", res); 227 return res; 228 } 229 230 if (mode == SPECTRAL_DISABLED) 231 return 0; 232 233 if (mode == SPECTRAL_BACKGROUND) 234 count = WMI_SPECTRAL_COUNT_DEFAULT; 235 else 236 count = max_t(u8, 1, ar->spectral.config.count); 237 238 arg.vdev_id = vdev_id; 239 arg.scan_count = count; 240 arg.scan_period = WMI_SPECTRAL_PERIOD_DEFAULT; 241 arg.scan_priority = WMI_SPECTRAL_PRIORITY_DEFAULT; 242 arg.scan_fft_size = ar->spectral.config.fft_size; 243 arg.scan_gc_ena = WMI_SPECTRAL_GC_ENA_DEFAULT; 244 arg.scan_restart_ena = WMI_SPECTRAL_RESTART_ENA_DEFAULT; 245 arg.scan_noise_floor_ref = WMI_SPECTRAL_NOISE_FLOOR_REF_DEFAULT; 246 arg.scan_init_delay = WMI_SPECTRAL_INIT_DELAY_DEFAULT; 247 arg.scan_nb_tone_thr = WMI_SPECTRAL_NB_TONE_THR_DEFAULT; 248 arg.scan_str_bin_thr = WMI_SPECTRAL_STR_BIN_THR_DEFAULT; 249 arg.scan_wb_rpt_mode = WMI_SPECTRAL_WB_RPT_MODE_DEFAULT; 250 arg.scan_rssi_rpt_mode = WMI_SPECTRAL_RSSI_RPT_MODE_DEFAULT; 251 arg.scan_rssi_thr = WMI_SPECTRAL_RSSI_THR_DEFAULT; 252 arg.scan_pwr_format = WMI_SPECTRAL_PWR_FORMAT_DEFAULT; 253 arg.scan_rpt_mode = WMI_SPECTRAL_RPT_MODE_DEFAULT; 254 arg.scan_bin_scale = WMI_SPECTRAL_BIN_SCALE_DEFAULT; 255 arg.scan_dbm_adj = WMI_SPECTRAL_DBM_ADJ_DEFAULT; 256 arg.scan_chn_mask = WMI_SPECTRAL_CHN_MASK_DEFAULT; 257 258 res = ath10k_wmi_vdev_spectral_conf(ar, &arg); 259 if (res < 0) { 260 ath10k_warn(ar, "failed to configure spectral scan: %d\n", res); 261 return res; 262 } 263 264 return 0; 265 } 266 267 static ssize_t read_file_spec_scan_ctl(struct file *file, char __user *user_buf, 268 size_t count, loff_t *ppos) 269 { 270 struct ath10k *ar = file->private_data; 271 char *mode = ""; 272 unsigned int len; 273 enum ath10k_spectral_mode spectral_mode; 274 275 mutex_lock(&ar->conf_mutex); 276 spectral_mode = ar->spectral.mode; 277 mutex_unlock(&ar->conf_mutex); 278 279 switch (spectral_mode) { 280 case SPECTRAL_DISABLED: 281 mode = "disable"; 282 break; 283 case SPECTRAL_BACKGROUND: 284 mode = "background"; 285 break; 286 case SPECTRAL_MANUAL: 287 mode = "manual"; 288 break; 289 } 290 291 len = strlen(mode); 292 return simple_read_from_buffer(user_buf, count, ppos, mode, len); 293 } 294 295 static ssize_t write_file_spec_scan_ctl(struct file *file, 296 const char __user *user_buf, 297 size_t count, loff_t *ppos) 298 { 299 struct ath10k *ar = file->private_data; 300 char buf[32]; 301 ssize_t len; 302 int res; 303 304 len = min(count, sizeof(buf) - 1); 305 if (copy_from_user(buf, user_buf, len)) 306 return -EFAULT; 307 308 buf[len] = '\0'; 309 310 mutex_lock(&ar->conf_mutex); 311 312 if (strncmp("trigger", buf, 7) == 0) { 313 if (ar->spectral.mode == SPECTRAL_MANUAL || 314 ar->spectral.mode == SPECTRAL_BACKGROUND) { 315 /* reset the configuration to adopt possibly changed 316 * debugfs parameters 317 */ 318 res = ath10k_spectral_scan_config(ar, 319 ar->spectral.mode); 320 if (res < 0) { 321 ath10k_warn(ar, "failed to reconfigure spectral scan: %d\n", 322 res); 323 } 324 res = ath10k_spectral_scan_trigger(ar); 325 if (res < 0) { 326 ath10k_warn(ar, "failed to trigger spectral scan: %d\n", 327 res); 328 } 329 } else { 330 res = -EINVAL; 331 } 332 } else if (strncmp("background", buf, 9) == 0) { 333 res = ath10k_spectral_scan_config(ar, SPECTRAL_BACKGROUND); 334 } else if (strncmp("manual", buf, 6) == 0) { 335 res = ath10k_spectral_scan_config(ar, SPECTRAL_MANUAL); 336 } else if (strncmp("disable", buf, 7) == 0) { 337 res = ath10k_spectral_scan_config(ar, SPECTRAL_DISABLED); 338 } else { 339 res = -EINVAL; 340 } 341 342 mutex_unlock(&ar->conf_mutex); 343 344 if (res < 0) 345 return res; 346 347 return count; 348 } 349 350 static const struct file_operations fops_spec_scan_ctl = { 351 .read = read_file_spec_scan_ctl, 352 .write = write_file_spec_scan_ctl, 353 .open = simple_open, 354 .owner = THIS_MODULE, 355 .llseek = default_llseek, 356 }; 357 358 static ssize_t read_file_spectral_count(struct file *file, 359 char __user *user_buf, 360 size_t count, loff_t *ppos) 361 { 362 struct ath10k *ar = file->private_data; 363 char buf[32]; 364 unsigned int len; 365 u8 spectral_count; 366 367 mutex_lock(&ar->conf_mutex); 368 spectral_count = ar->spectral.config.count; 369 mutex_unlock(&ar->conf_mutex); 370 371 len = sprintf(buf, "%d\n", spectral_count); 372 return simple_read_from_buffer(user_buf, count, ppos, buf, len); 373 } 374 375 static ssize_t write_file_spectral_count(struct file *file, 376 const char __user *user_buf, 377 size_t count, loff_t *ppos) 378 { 379 struct ath10k *ar = file->private_data; 380 unsigned long val; 381 char buf[32]; 382 ssize_t len; 383 384 len = min(count, sizeof(buf) - 1); 385 if (copy_from_user(buf, user_buf, len)) 386 return -EFAULT; 387 388 buf[len] = '\0'; 389 if (kstrtoul(buf, 0, &val)) 390 return -EINVAL; 391 392 if (val < 0 || val > 255) 393 return -EINVAL; 394 395 mutex_lock(&ar->conf_mutex); 396 ar->spectral.config.count = val; 397 mutex_unlock(&ar->conf_mutex); 398 399 return count; 400 } 401 402 static const struct file_operations fops_spectral_count = { 403 .read = read_file_spectral_count, 404 .write = write_file_spectral_count, 405 .open = simple_open, 406 .owner = THIS_MODULE, 407 .llseek = default_llseek, 408 }; 409 410 static ssize_t read_file_spectral_bins(struct file *file, 411 char __user *user_buf, 412 size_t count, loff_t *ppos) 413 { 414 struct ath10k *ar = file->private_data; 415 char buf[32]; 416 unsigned int len, bins, fft_size, bin_scale; 417 418 mutex_lock(&ar->conf_mutex); 419 420 fft_size = ar->spectral.config.fft_size; 421 bin_scale = WMI_SPECTRAL_BIN_SCALE_DEFAULT; 422 bins = 1 << (fft_size - bin_scale); 423 424 mutex_unlock(&ar->conf_mutex); 425 426 len = sprintf(buf, "%d\n", bins); 427 return simple_read_from_buffer(user_buf, count, ppos, buf, len); 428 } 429 430 static ssize_t write_file_spectral_bins(struct file *file, 431 const char __user *user_buf, 432 size_t count, loff_t *ppos) 433 { 434 struct ath10k *ar = file->private_data; 435 unsigned long val; 436 char buf[32]; 437 ssize_t len; 438 439 len = min(count, sizeof(buf) - 1); 440 if (copy_from_user(buf, user_buf, len)) 441 return -EFAULT; 442 443 buf[len] = '\0'; 444 if (kstrtoul(buf, 0, &val)) 445 return -EINVAL; 446 447 if (val < 64 || val > SPECTRAL_ATH10K_MAX_NUM_BINS) 448 return -EINVAL; 449 450 if (!is_power_of_2(val)) 451 return -EINVAL; 452 453 mutex_lock(&ar->conf_mutex); 454 ar->spectral.config.fft_size = ilog2(val); 455 ar->spectral.config.fft_size += WMI_SPECTRAL_BIN_SCALE_DEFAULT; 456 mutex_unlock(&ar->conf_mutex); 457 458 return count; 459 } 460 461 static const struct file_operations fops_spectral_bins = { 462 .read = read_file_spectral_bins, 463 .write = write_file_spectral_bins, 464 .open = simple_open, 465 .owner = THIS_MODULE, 466 .llseek = default_llseek, 467 }; 468 469 static struct dentry *create_buf_file_handler(const char *filename, 470 struct dentry *parent, 471 umode_t mode, 472 struct rchan_buf *buf, 473 int *is_global) 474 { 475 struct dentry *buf_file; 476 477 buf_file = debugfs_create_file(filename, mode, parent, buf, 478 &relay_file_operations); 479 *is_global = 1; 480 return buf_file; 481 } 482 483 static int remove_buf_file_handler(struct dentry *dentry) 484 { 485 debugfs_remove(dentry); 486 487 return 0; 488 } 489 490 static struct rchan_callbacks rfs_spec_scan_cb = { 491 .create_buf_file = create_buf_file_handler, 492 .remove_buf_file = remove_buf_file_handler, 493 }; 494 495 int ath10k_spectral_start(struct ath10k *ar) 496 { 497 struct ath10k_vif *arvif; 498 499 lockdep_assert_held(&ar->conf_mutex); 500 501 list_for_each_entry(arvif, &ar->arvifs, list) 502 arvif->spectral_enabled = 0; 503 504 ar->spectral.mode = SPECTRAL_DISABLED; 505 ar->spectral.config.count = WMI_SPECTRAL_COUNT_DEFAULT; 506 ar->spectral.config.fft_size = WMI_SPECTRAL_FFT_SIZE_DEFAULT; 507 508 return 0; 509 } 510 511 int ath10k_spectral_vif_stop(struct ath10k_vif *arvif) 512 { 513 if (!arvif->spectral_enabled) 514 return 0; 515 516 return ath10k_spectral_scan_config(arvif->ar, SPECTRAL_DISABLED); 517 } 518 519 int ath10k_spectral_create(struct ath10k *ar) 520 { 521 ar->spectral.rfs_chan_spec_scan = relay_open("spectral_scan", 522 ar->debug.debugfs_phy, 523 1024, 256, 524 &rfs_spec_scan_cb, NULL); 525 debugfs_create_file("spectral_scan_ctl", 526 S_IRUSR | S_IWUSR, 527 ar->debug.debugfs_phy, ar, 528 &fops_spec_scan_ctl); 529 debugfs_create_file("spectral_count", 530 S_IRUSR | S_IWUSR, 531 ar->debug.debugfs_phy, ar, 532 &fops_spectral_count); 533 debugfs_create_file("spectral_bins", 534 S_IRUSR | S_IWUSR, 535 ar->debug.debugfs_phy, ar, 536 &fops_spectral_bins); 537 538 return 0; 539 } 540 541 void ath10k_spectral_destroy(struct ath10k *ar) 542 { 543 if (ar->spectral.rfs_chan_spec_scan) { 544 relay_close(ar->spectral.rfs_chan_spec_scan); 545 ar->spectral.rfs_chan_spec_scan = NULL; 546 } 547 } 548