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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#include "wmi-ops.h"
21
22static void send_fft_sample(struct ath10k *ar,
23 const struct fft_sample_tlv *fft_sample_tlv)
24{
25 int length;
26
27 if (!ar->spectral.rfs_chan_spec_scan)
28 return;
29
30 length = __be16_to_cpu(fft_sample_tlv->length) +
31 sizeof(*fft_sample_tlv);
32 relay_write(ar->spectral.rfs_chan_spec_scan, fft_sample_tlv, length);
33}
34
35static uint8_t get_max_exp(s8 max_index, u16 max_magnitude, size_t bin_len,
36 u8 *data)
37{
38 int dc_pos;
39 u8 max_exp;
40
41 dc_pos = bin_len / 2;
42
43 /* peak index outside of bins */
44 if (dc_pos < max_index || -dc_pos >= max_index)
45 return 0;
46
47 for (max_exp = 0; max_exp < 8; max_exp++) {
48 if (data[dc_pos + max_index] == (max_magnitude >> max_exp))
49 break;
50 }
51
52 /* max_exp not found */
53 if (data[dc_pos + max_index] != (max_magnitude >> max_exp))
54 return 0;
55
56 return max_exp;
57}
58
59int ath10k_spectral_process_fft(struct ath10k *ar,
60 struct wmi_phyerr_ev_arg *phyerr,
61 const struct phyerr_fft_report *fftr,
62 size_t bin_len, u64 tsf)
63{
64 struct fft_sample_ath10k *fft_sample;
65 u8 buf[sizeof(*fft_sample) + SPECTRAL_ATH10K_MAX_NUM_BINS];
66 u16 freq1, freq2, total_gain_db, base_pwr_db, length, peak_mag;
67 u32 reg0, reg1;
68 u8 chain_idx, *bins;
69 int dc_pos;
70
71 fft_sample = (struct fft_sample_ath10k *)&buf;
72
73 if (bin_len < 64 || bin_len > SPECTRAL_ATH10K_MAX_NUM_BINS)
74 return -EINVAL;
75
76 /* qca99x0 reports bin size as 68 bytes (64 bytes + 4 bytes) in
77 * report mode 2. First 64 bytes carries inband tones (-32 to +31)
78 * and last 4 byte carries band edge detection data (+32) mainly
79 * used in radar detection purpose. Strip last 4 byte to make bin
80 * size is valid one.
81 */
82 if (bin_len == 68)
83 bin_len -= 4;
84
85 reg0 = __le32_to_cpu(fftr->reg0);
86 reg1 = __le32_to_cpu(fftr->reg1);
87
88 length = sizeof(*fft_sample) - sizeof(struct fft_sample_tlv) + bin_len;
89 fft_sample->tlv.type = ATH_FFT_SAMPLE_ATH10K;
90 fft_sample->tlv.length = __cpu_to_be16(length);
91
92 /* TODO: there might be a reason why the hardware reports 20/40/80 MHz,
93 * but the results/plots suggest that its actually 22/44/88 MHz.
94 */
95 switch (phyerr->chan_width_mhz) {
96 case 20:
97 fft_sample->chan_width_mhz = 22;
98 break;
99 case 40:
100 fft_sample->chan_width_mhz = 44;
101 break;
102 case 80:
103 /* TODO: As experiments with an analogue sender and various
104 * configurations (fft-sizes of 64/128/256 and 20/40/80 Mhz)
105 * show, the particular configuration of 80 MHz/64 bins does
106 * not match with the other samples at all. Until the reason
107 * for that is found, don't report these samples.
108 */
109 if (bin_len == 64)
110 return -EINVAL;
111 fft_sample->chan_width_mhz = 88;
112 break;
113 default:
114 fft_sample->chan_width_mhz = phyerr->chan_width_mhz;
115 }
116
117 fft_sample->relpwr_db = MS(reg1, SEARCH_FFT_REPORT_REG1_RELPWR_DB);
118 fft_sample->avgpwr_db = MS(reg1, SEARCH_FFT_REPORT_REG1_AVGPWR_DB);
119
120 peak_mag = MS(reg1, SEARCH_FFT_REPORT_REG1_PEAK_MAG);
121 fft_sample->max_magnitude = __cpu_to_be16(peak_mag);
122 fft_sample->max_index = MS(reg0, SEARCH_FFT_REPORT_REG0_PEAK_SIDX);
123 fft_sample->rssi = phyerr->rssi_combined;
124
125 total_gain_db = MS(reg0, SEARCH_FFT_REPORT_REG0_TOTAL_GAIN_DB);
126 base_pwr_db = MS(reg0, SEARCH_FFT_REPORT_REG0_BASE_PWR_DB);
127 fft_sample->total_gain_db = __cpu_to_be16(total_gain_db);
128 fft_sample->base_pwr_db = __cpu_to_be16(base_pwr_db);
129
130 freq1 = phyerr->freq1;
131 freq2 = phyerr->freq2;
132 fft_sample->freq1 = __cpu_to_be16(freq1);
133 fft_sample->freq2 = __cpu_to_be16(freq2);
134
135 chain_idx = MS(reg0, SEARCH_FFT_REPORT_REG0_FFT_CHN_IDX);
136
137 fft_sample->noise = __cpu_to_be16(phyerr->nf_chains[chain_idx]);
138
139 bins = (u8 *)fftr;
140 bins += sizeof(*fftr);
141
142 fft_sample->tsf = __cpu_to_be64(tsf);
143
144 /* max_exp has been directly reported by previous hardware (ath9k),
145 * maybe its possible to get it by other means?
146 */
147 fft_sample->max_exp = get_max_exp(fft_sample->max_index, peak_mag,
148 bin_len, bins);
149
150 memcpy(fft_sample->data, bins, bin_len);
151
152 /* DC value (value in the middle) is the blind spot of the spectral
153 * sample and invalid, interpolate it.
154 */
155 dc_pos = bin_len / 2;
156 fft_sample->data[dc_pos] = (fft_sample->data[dc_pos + 1] +
157 fft_sample->data[dc_pos - 1]) / 2;
158
159 send_fft_sample(ar, &fft_sample->tlv);
160
161 return 0;
162}
163
164static struct ath10k_vif *ath10k_get_spectral_vdev(struct ath10k *ar)
165{
166 struct ath10k_vif *arvif;
167
168 lockdep_assert_held(&ar->conf_mutex);
169
170 if (list_empty(&ar->arvifs))
171 return NULL;
172
173 /* if there already is a vif doing spectral, return that. */
174 list_for_each_entry(arvif, &ar->arvifs, list)
175 if (arvif->spectral_enabled)
176 return arvif;
177
178 /* otherwise, return the first vif. */
179 return list_first_entry(&ar->arvifs, typeof(*arvif), list);
180}
181
182static int ath10k_spectral_scan_trigger(struct ath10k *ar)
183{
184 struct ath10k_vif *arvif;
185 int res;
186 int vdev_id;
187
188 lockdep_assert_held(&ar->conf_mutex);
189
190 arvif = ath10k_get_spectral_vdev(ar);
191 if (!arvif)
192 return -ENODEV;
193 vdev_id = arvif->vdev_id;
194
195 if (ar->spectral.mode == SPECTRAL_DISABLED)
196 return 0;
197
198 res = ath10k_wmi_vdev_spectral_enable(ar, vdev_id,
199 WMI_SPECTRAL_TRIGGER_CMD_CLEAR,
200 WMI_SPECTRAL_ENABLE_CMD_ENABLE);
201 if (res < 0)
202 return res;
203
204 res = ath10k_wmi_vdev_spectral_enable(ar, vdev_id,
205 WMI_SPECTRAL_TRIGGER_CMD_TRIGGER,
206 WMI_SPECTRAL_ENABLE_CMD_ENABLE);
207 if (res < 0)
208 return res;
209
210 return 0;
211}
212
213static int ath10k_spectral_scan_config(struct ath10k *ar,
214 enum ath10k_spectral_mode mode)
215{
216 struct wmi_vdev_spectral_conf_arg arg;
217 struct ath10k_vif *arvif;
218 int vdev_id, count, res = 0;
219
220 lockdep_assert_held(&ar->conf_mutex);
221
222 arvif = ath10k_get_spectral_vdev(ar);
223 if (!arvif)
224 return -ENODEV;
225
226 vdev_id = arvif->vdev_id;
227
228 arvif->spectral_enabled = (mode != SPECTRAL_DISABLED);
229 ar->spectral.mode = mode;
230
231 res = ath10k_wmi_vdev_spectral_enable(ar, vdev_id,
232 WMI_SPECTRAL_TRIGGER_CMD_CLEAR,
233 WMI_SPECTRAL_ENABLE_CMD_DISABLE);
234 if (res < 0) {
235 ath10k_warn(ar, "failed to enable spectral scan: %d\n", res);
236 return res;
237 }
238
239 if (mode == SPECTRAL_DISABLED)
240 return 0;
241
242 if (mode == SPECTRAL_BACKGROUND)
243 count = WMI_SPECTRAL_COUNT_DEFAULT;
244 else
245 count = max_t(u8, 1, ar->spectral.config.count);
246
247 arg.vdev_id = vdev_id;
248 arg.scan_count = count;
249 arg.scan_period = WMI_SPECTRAL_PERIOD_DEFAULT;
250 arg.scan_priority = WMI_SPECTRAL_PRIORITY_DEFAULT;
251 arg.scan_fft_size = ar->spectral.config.fft_size;
252 arg.scan_gc_ena = WMI_SPECTRAL_GC_ENA_DEFAULT;
253 arg.scan_restart_ena = WMI_SPECTRAL_RESTART_ENA_DEFAULT;
254 arg.scan_noise_floor_ref = WMI_SPECTRAL_NOISE_FLOOR_REF_DEFAULT;
255 arg.scan_init_delay = WMI_SPECTRAL_INIT_DELAY_DEFAULT;
256 arg.scan_nb_tone_thr = WMI_SPECTRAL_NB_TONE_THR_DEFAULT;
257 arg.scan_str_bin_thr = WMI_SPECTRAL_STR_BIN_THR_DEFAULT;
258 arg.scan_wb_rpt_mode = WMI_SPECTRAL_WB_RPT_MODE_DEFAULT;
259 arg.scan_rssi_rpt_mode = WMI_SPECTRAL_RSSI_RPT_MODE_DEFAULT;
260 arg.scan_rssi_thr = WMI_SPECTRAL_RSSI_THR_DEFAULT;
261 arg.scan_pwr_format = WMI_SPECTRAL_PWR_FORMAT_DEFAULT;
262 arg.scan_rpt_mode = WMI_SPECTRAL_RPT_MODE_DEFAULT;
263 arg.scan_bin_scale = WMI_SPECTRAL_BIN_SCALE_DEFAULT;
264 arg.scan_dbm_adj = WMI_SPECTRAL_DBM_ADJ_DEFAULT;
265 arg.scan_chn_mask = WMI_SPECTRAL_CHN_MASK_DEFAULT;
266
267 res = ath10k_wmi_vdev_spectral_conf(ar, &arg);
268 if (res < 0) {
269 ath10k_warn(ar, "failed to configure spectral scan: %d\n", res);
270 return res;
271 }
272
273 return 0;
274}
275
276static ssize_t read_file_spec_scan_ctl(struct file *file, char __user *user_buf,
277 size_t count, loff_t *ppos)
278{
279 struct ath10k *ar = file->private_data;
280 char *mode = "";
281 unsigned int len;
282 enum ath10k_spectral_mode spectral_mode;
283
284 mutex_lock(&ar->conf_mutex);
285 spectral_mode = ar->spectral.mode;
286 mutex_unlock(&ar->conf_mutex);
287
288 switch (spectral_mode) {
289 case SPECTRAL_DISABLED:
290 mode = "disable";
291 break;
292 case SPECTRAL_BACKGROUND:
293 mode = "background";
294 break;
295 case SPECTRAL_MANUAL:
296 mode = "manual";
297 break;
298 }
299
300 len = strlen(mode);
301 return simple_read_from_buffer(user_buf, count, ppos, mode, len);
302}
303
304static ssize_t write_file_spec_scan_ctl(struct file *file,
305 const char __user *user_buf,
306 size_t count, loff_t *ppos)
307{
308 struct ath10k *ar = file->private_data;
309 char buf[32];
310 ssize_t len;
311 int res;
312
313 len = min(count, sizeof(buf) - 1);
314 if (copy_from_user(buf, user_buf, len))
315 return -EFAULT;
316
317 buf[len] = '\0';
318
319 mutex_lock(&ar->conf_mutex);
320
321 if (strncmp("trigger", buf, 7) == 0) {
322 if (ar->spectral.mode == SPECTRAL_MANUAL ||
323 ar->spectral.mode == SPECTRAL_BACKGROUND) {
324 /* reset the configuration to adopt possibly changed
325 * debugfs parameters
326 */
327 res = ath10k_spectral_scan_config(ar,
328 ar->spectral.mode);
329 if (res < 0) {
330 ath10k_warn(ar, "failed to reconfigure spectral scan: %d\n",
331 res);
332 }
333 res = ath10k_spectral_scan_trigger(ar);
334 if (res < 0) {
335 ath10k_warn(ar, "failed to trigger spectral scan: %d\n",
336 res);
337 }
338 } else {
339 res = -EINVAL;
340 }
341 } else if (strncmp("background", buf, 10) == 0) {
342 res = ath10k_spectral_scan_config(ar, SPECTRAL_BACKGROUND);
343 } else if (strncmp("manual", buf, 6) == 0) {
344 res = ath10k_spectral_scan_config(ar, SPECTRAL_MANUAL);
345 } else if (strncmp("disable", buf, 7) == 0) {
346 res = ath10k_spectral_scan_config(ar, SPECTRAL_DISABLED);
347 } else {
348 res = -EINVAL;
349 }
350
351 mutex_unlock(&ar->conf_mutex);
352
353 if (res < 0)
354 return res;
355
356 return count;
357}
358
359static const struct file_operations fops_spec_scan_ctl = {
360 .read = read_file_spec_scan_ctl,
361 .write = write_file_spec_scan_ctl,
362 .open = simple_open,
363 .owner = THIS_MODULE,
364 .llseek = default_llseek,
365};
366
367static ssize_t read_file_spectral_count(struct file *file,
368 char __user *user_buf,
369 size_t count, loff_t *ppos)
370{
371 struct ath10k *ar = file->private_data;
372 char buf[32];
373 unsigned int len;
374 u8 spectral_count;
375
376 mutex_lock(&ar->conf_mutex);
377 spectral_count = ar->spectral.config.count;
378 mutex_unlock(&ar->conf_mutex);
379
380 len = sprintf(buf, "%d\n", spectral_count);
381 return simple_read_from_buffer(user_buf, count, ppos, buf, len);
382}
383
384static ssize_t write_file_spectral_count(struct file *file,
385 const char __user *user_buf,
386 size_t count, loff_t *ppos)
387{
388 struct ath10k *ar = file->private_data;
389 unsigned long val;
390 char buf[32];
391 ssize_t len;
392
393 len = min(count, sizeof(buf) - 1);
394 if (copy_from_user(buf, user_buf, len))
395 return -EFAULT;
396
397 buf[len] = '\0';
398 if (kstrtoul(buf, 0, &val))
399 return -EINVAL;
400
401 if (val < 0 || val > 255)
402 return -EINVAL;
403
404 mutex_lock(&ar->conf_mutex);
405 ar->spectral.config.count = val;
406 mutex_unlock(&ar->conf_mutex);
407
408 return count;
409}
410
411static const struct file_operations fops_spectral_count = {
412 .read = read_file_spectral_count,
413 .write = write_file_spectral_count,
414 .open = simple_open,
415 .owner = THIS_MODULE,
416 .llseek = default_llseek,
417};
418
419static ssize_t read_file_spectral_bins(struct file *file,
420 char __user *user_buf,
421 size_t count, loff_t *ppos)
422{
423 struct ath10k *ar = file->private_data;
424 char buf[32];
425 unsigned int len, bins, fft_size, bin_scale;
426
427 mutex_lock(&ar->conf_mutex);
428
429 fft_size = ar->spectral.config.fft_size;
430 bin_scale = WMI_SPECTRAL_BIN_SCALE_DEFAULT;
431 bins = 1 << (fft_size - bin_scale);
432
433 mutex_unlock(&ar->conf_mutex);
434
435 len = sprintf(buf, "%d\n", bins);
436 return simple_read_from_buffer(user_buf, count, ppos, buf, len);
437}
438
439static ssize_t write_file_spectral_bins(struct file *file,
440 const char __user *user_buf,
441 size_t count, loff_t *ppos)
442{
443 struct ath10k *ar = file->private_data;
444 unsigned long val;
445 char buf[32];
446 ssize_t len;
447
448 len = min(count, sizeof(buf) - 1);
449 if (copy_from_user(buf, user_buf, len))
450 return -EFAULT;
451
452 buf[len] = '\0';
453 if (kstrtoul(buf, 0, &val))
454 return -EINVAL;
455
456 if (val < 64 || val > SPECTRAL_ATH10K_MAX_NUM_BINS)
457 return -EINVAL;
458
459 if (!is_power_of_2(val))
460 return -EINVAL;
461
462 mutex_lock(&ar->conf_mutex);
463 ar->spectral.config.fft_size = ilog2(val);
464 ar->spectral.config.fft_size += WMI_SPECTRAL_BIN_SCALE_DEFAULT;
465 mutex_unlock(&ar->conf_mutex);
466
467 return count;
468}
469
470static const struct file_operations fops_spectral_bins = {
471 .read = read_file_spectral_bins,
472 .write = write_file_spectral_bins,
473 .open = simple_open,
474 .owner = THIS_MODULE,
475 .llseek = default_llseek,
476};
477
478static struct dentry *create_buf_file_handler(const char *filename,
479 struct dentry *parent,
480 umode_t mode,
481 struct rchan_buf *buf,
482 int *is_global)
483{
484 struct dentry *buf_file;
485
486 buf_file = debugfs_create_file(filename, mode, parent, buf,
487 &relay_file_operations);
488 *is_global = 1;
489 return buf_file;
490}
491
492static int remove_buf_file_handler(struct dentry *dentry)
493{
494 debugfs_remove(dentry);
495
496 return 0;
497}
498
499static struct rchan_callbacks rfs_spec_scan_cb = {
500 .create_buf_file = create_buf_file_handler,
501 .remove_buf_file = remove_buf_file_handler,
502};
503
504int ath10k_spectral_start(struct ath10k *ar)
505{
506 struct ath10k_vif *arvif;
507
508 lockdep_assert_held(&ar->conf_mutex);
509
510 list_for_each_entry(arvif, &ar->arvifs, list)
511 arvif->spectral_enabled = 0;
512
513 ar->spectral.mode = SPECTRAL_DISABLED;
514 ar->spectral.config.count = WMI_SPECTRAL_COUNT_DEFAULT;
515 ar->spectral.config.fft_size = WMI_SPECTRAL_FFT_SIZE_DEFAULT;
516
517 return 0;
518}
519
520int ath10k_spectral_vif_stop(struct ath10k_vif *arvif)
521{
522 if (!arvif->spectral_enabled)
523 return 0;
524
525 return ath10k_spectral_scan_config(arvif->ar, SPECTRAL_DISABLED);
526}
527
528int ath10k_spectral_create(struct ath10k *ar)
529{
530 /* The buffer size covers whole channels in dual bands up to 128 bins.
531 * Scan with bigger than 128 bins needs to be run on single band each.
532 */
533 ar->spectral.rfs_chan_spec_scan = relay_open("spectral_scan",
534 ar->debug.debugfs_phy,
535 1140, 2500,
536 &rfs_spec_scan_cb, NULL);
537 debugfs_create_file("spectral_scan_ctl",
538 S_IRUSR | S_IWUSR,
539 ar->debug.debugfs_phy, ar,
540 &fops_spec_scan_ctl);
541 debugfs_create_file("spectral_count",
542 S_IRUSR | S_IWUSR,
543 ar->debug.debugfs_phy, ar,
544 &fops_spectral_count);
545 debugfs_create_file("spectral_bins",
546 S_IRUSR | S_IWUSR,
547 ar->debug.debugfs_phy, ar,
548 &fops_spectral_bins);
549
550 return 0;
551}
552
553void ath10k_spectral_destroy(struct ath10k *ar)
554{
555 if (ar->spectral.rfs_chan_spec_scan) {
556 relay_close(ar->spectral.rfs_chan_spec_scan);
557 ar->spectral.rfs_chan_spec_scan = NULL;
558 }
559}