?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / net / wireless / ath / ath9k / common-spectral.c
blob21191955a7c1eb332e5917194df37a74802f0d2d
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);
Linux with added FPC-III support