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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / media / platform / vivid / vivid-sdr-cap.c
blob2b7522e16efcda176ac0097db38770f0c052cb82
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * vivid-sdr-cap.c - software defined radio support functions.
4 *
5 * Copyright 2014 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
6 */
7
8 #include <linux/errno.h>
9 #include <linux/kernel.h>
10 #include <linux/delay.h>
11 #include <linux/kthread.h>
12 #include <linux/freezer.h>
13 #include <linux/math64.h>
14 #include <linux/videodev2.h>
15 #include <linux/v4l2-dv-timings.h>
16 #include <media/v4l2-common.h>
17 #include <media/v4l2-event.h>
18 #include <media/v4l2-dv-timings.h>
19 #include <linux/fixp-arith.h>
20
21 #include "vivid-core.h"
22 #include "vivid-ctrls.h"
23 #include "vivid-sdr-cap.h"
24
25 /* stream formats */
26 struct vivid_format {
27 u32 pixelformat;
28 u32 buffersize;
29 };
30
31 /* format descriptions for capture and preview */
32 static const struct vivid_format formats[] = {
33 {
34 .pixelformat = V4L2_SDR_FMT_CU8,
35 .buffersize = SDR_CAP_SAMPLES_PER_BUF * 2,
36 }, {
37 .pixelformat = V4L2_SDR_FMT_CS8,
38 .buffersize = SDR_CAP_SAMPLES_PER_BUF * 2,
39 },
40 };
41
42 static const struct v4l2_frequency_band bands_adc[] = {
43 {
44 .tuner = 0,
45 .type = V4L2_TUNER_ADC,
46 .index = 0,
47 .capability = V4L2_TUNER_CAP_1HZ | V4L2_TUNER_CAP_FREQ_BANDS,
48 .rangelow = 300000,
49 .rangehigh = 300000,
50 },
51 {
52 .tuner = 0,
53 .type = V4L2_TUNER_ADC,
54 .index = 1,
55 .capability = V4L2_TUNER_CAP_1HZ | V4L2_TUNER_CAP_FREQ_BANDS,
56 .rangelow = 900001,
57 .rangehigh = 2800000,
58 },
59 {
60 .tuner = 0,
61 .type = V4L2_TUNER_ADC,
62 .index = 2,
63 .capability = V4L2_TUNER_CAP_1HZ | V4L2_TUNER_CAP_FREQ_BANDS,
64 .rangelow = 3200000,
65 .rangehigh = 3200000,
66 },
67 };
68
69 /* ADC band midpoints */
70 #define BAND_ADC_0 ((bands_adc[0].rangehigh + bands_adc[1].rangelow) / 2)
71 #define BAND_ADC_1 ((bands_adc[1].rangehigh + bands_adc[2].rangelow) / 2)
72
73 static const struct v4l2_frequency_band bands_fm[] = {
74 {
75 .tuner = 1,
76 .type = V4L2_TUNER_RF,
77 .index = 0,
78 .capability = V4L2_TUNER_CAP_1HZ | V4L2_TUNER_CAP_FREQ_BANDS,
79 .rangelow = 50000000,
80 .rangehigh = 2000000000,
81 },
82 };
83
84 static void vivid_thread_sdr_cap_tick(struct vivid_dev *dev)
85 {
86 struct vivid_buffer *sdr_cap_buf = NULL;
87
88 dprintk(dev, 1, "SDR Capture Thread Tick\n");
89
90 /* Drop a certain percentage of buffers. */
91 if (dev->perc_dropped_buffers &&
92 prandom_u32_max(100) < dev->perc_dropped_buffers)
93 return;
94
95 spin_lock(&dev->slock);
96 if (!list_empty(&dev->sdr_cap_active)) {
97 sdr_cap_buf = list_entry(dev->sdr_cap_active.next,
98 struct vivid_buffer, list);
99 list_del(&sdr_cap_buf->list);
100 }
101 spin_unlock(&dev->slock);
102
103 if (sdr_cap_buf) {
104 sdr_cap_buf->vb.sequence = dev->sdr_cap_seq_count;
105 v4l2_ctrl_request_setup(sdr_cap_buf->vb.vb2_buf.req_obj.req,
106 &dev->ctrl_hdl_sdr_cap);
107 v4l2_ctrl_request_complete(sdr_cap_buf->vb.vb2_buf.req_obj.req,
108 &dev->ctrl_hdl_sdr_cap);
109 vivid_sdr_cap_process(dev, sdr_cap_buf);
110 sdr_cap_buf->vb.vb2_buf.timestamp =
111 ktime_get_ns() + dev->time_wrap_offset;
112 vb2_buffer_done(&sdr_cap_buf->vb.vb2_buf, dev->dqbuf_error ?
113 VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
114 dev->dqbuf_error = false;
115 }
116 }
117
118 static int vivid_thread_sdr_cap(void *data)
119 {
120 struct vivid_dev *dev = data;
121 u64 samples_since_start;
122 u64 buffers_since_start;
123 u64 next_jiffies_since_start;
124 unsigned long jiffies_since_start;
125 unsigned long cur_jiffies;
126 unsigned wait_jiffies;
127
128 dprintk(dev, 1, "SDR Capture Thread Start\n");
129
130 set_freezable();
131
132 /* Resets frame counters */
133 dev->sdr_cap_seq_offset = 0;
134 if (dev->seq_wrap)
135 dev->sdr_cap_seq_offset = 0xffffff80U;
136 dev->jiffies_sdr_cap = jiffies;
137 dev->sdr_cap_seq_resync = false;
138
139 for (;;) {
140 try_to_freeze();
141 if (kthread_should_stop())
142 break;
143
144 if (!mutex_trylock(&dev->mutex)) {
145 schedule_timeout_uninterruptible(1);
146 continue;
147 }
148
149 cur_jiffies = jiffies;
150 if (dev->sdr_cap_seq_resync) {
151 dev->jiffies_sdr_cap = cur_jiffies;
152 dev->sdr_cap_seq_offset = dev->sdr_cap_seq_count + 1;
153 dev->sdr_cap_seq_count = 0;
154 dev->sdr_cap_seq_resync = false;
155 }
156 /* Calculate the number of jiffies since we started streaming */
157 jiffies_since_start = cur_jiffies - dev->jiffies_sdr_cap;
158 /* Get the number of buffers streamed since the start */
159 buffers_since_start =
160 (u64)jiffies_since_start * dev->sdr_adc_freq +
161 (HZ * SDR_CAP_SAMPLES_PER_BUF) / 2;
162 do_div(buffers_since_start, HZ * SDR_CAP_SAMPLES_PER_BUF);
163
164 /*
165 * After more than 0xf0000000 (rounded down to a multiple of
166 * 'jiffies-per-day' to ease jiffies_to_msecs calculation)
167 * jiffies have passed since we started streaming reset the
168 * counters and keep track of the sequence offset.
169 */
170 if (jiffies_since_start > JIFFIES_RESYNC) {
171 dev->jiffies_sdr_cap = cur_jiffies;
172 dev->sdr_cap_seq_offset = buffers_since_start;
173 buffers_since_start = 0;
174 }
175 dev->sdr_cap_seq_count =
176 buffers_since_start + dev->sdr_cap_seq_offset;
177
178 vivid_thread_sdr_cap_tick(dev);
179 mutex_unlock(&dev->mutex);
180
181 /*
182 * Calculate the number of samples streamed since we started,
183 * not including the current buffer.
184 */
185 samples_since_start = buffers_since_start * SDR_CAP_SAMPLES_PER_BUF;
186
187 /* And the number of jiffies since we started */
188 jiffies_since_start = jiffies - dev->jiffies_sdr_cap;
189
190 /* Increase by the number of samples in one buffer */
191 samples_since_start += SDR_CAP_SAMPLES_PER_BUF;
192 /*
193 * Calculate when that next buffer is supposed to start
194 * in jiffies since we started streaming.
195 */
196 next_jiffies_since_start = samples_since_start * HZ +
197 dev->sdr_adc_freq / 2;
198 do_div(next_jiffies_since_start, dev->sdr_adc_freq);
199 /* If it is in the past, then just schedule asap */
200 if (next_jiffies_since_start < jiffies_since_start)
201 next_jiffies_since_start = jiffies_since_start;
202
203 wait_jiffies = next_jiffies_since_start - jiffies_since_start;
204 schedule_timeout_interruptible(wait_jiffies ? wait_jiffies : 1);
205 }
206 dprintk(dev, 1, "SDR Capture Thread End\n");
207 return 0;
208 }
209
210 static int sdr_cap_queue_setup(struct vb2_queue *vq,
211 unsigned *nbuffers, unsigned *nplanes,
212 unsigned sizes[], struct device *alloc_devs[])
213 {
214 /* 2 = max 16-bit sample returned */
215 sizes[0] = SDR_CAP_SAMPLES_PER_BUF * 2;
216 *nplanes = 1;
217 return 0;
218 }
219
220 static int sdr_cap_buf_prepare(struct vb2_buffer *vb)
221 {
222 struct vivid_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
223 unsigned size = SDR_CAP_SAMPLES_PER_BUF * 2;
224
225 dprintk(dev, 1, "%s\n", __func__);
226
227 if (dev->buf_prepare_error) {
228 /*
229 * Error injection: test what happens if buf_prepare() returns
230 * an error.
231 */
232 dev->buf_prepare_error = false;
233 return -EINVAL;
234 }
235 if (vb2_plane_size(vb, 0) < size) {
236 dprintk(dev, 1, "%s data will not fit into plane (%lu < %u)\n",
237 __func__, vb2_plane_size(vb, 0), size);
238 return -EINVAL;
239 }
240 vb2_set_plane_payload(vb, 0, size);
241
242 return 0;
243 }
244
245 static void sdr_cap_buf_queue(struct vb2_buffer *vb)
246 {
247 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
248 struct vivid_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
249 struct vivid_buffer *buf = container_of(vbuf, struct vivid_buffer, vb);
250
251 dprintk(dev, 1, "%s\n", __func__);
252
253 spin_lock(&dev->slock);
254 list_add_tail(&buf->list, &dev->sdr_cap_active);
255 spin_unlock(&dev->slock);
256 }
257
258 static int sdr_cap_start_streaming(struct vb2_queue *vq, unsigned count)
259 {
260 struct vivid_dev *dev = vb2_get_drv_priv(vq);
261 int err = 0;
262
263 dprintk(dev, 1, "%s\n", __func__);
264 dev->sdr_cap_seq_count = 0;
265 if (dev->start_streaming_error) {
266 dev->start_streaming_error = false;
267 err = -EINVAL;
268 } else if (dev->kthread_sdr_cap == NULL) {
269 dev->kthread_sdr_cap = kthread_run(vivid_thread_sdr_cap, dev,
270 "%s-sdr-cap", dev->v4l2_dev.name);
271
272 if (IS_ERR(dev->kthread_sdr_cap)) {
273 v4l2_err(&dev->v4l2_dev, "kernel_thread() failed\n");
274 err = PTR_ERR(dev->kthread_sdr_cap);
275 dev->kthread_sdr_cap = NULL;
276 }
277 }
278 if (err) {
279 struct vivid_buffer *buf, *tmp;
280
281 list_for_each_entry_safe(buf, tmp, &dev->sdr_cap_active, list) {
282 list_del(&buf->list);
283 vb2_buffer_done(&buf->vb.vb2_buf,
284 VB2_BUF_STATE_QUEUED);
285 }
286 }
287 return err;
288 }
289
290 /* abort streaming and wait for last buffer */
291 static void sdr_cap_stop_streaming(struct vb2_queue *vq)
292 {
293 struct vivid_dev *dev = vb2_get_drv_priv(vq);
294
295 if (dev->kthread_sdr_cap == NULL)
296 return;
297
298 while (!list_empty(&dev->sdr_cap_active)) {
299 struct vivid_buffer *buf;
300
301 buf = list_entry(dev->sdr_cap_active.next,
302 struct vivid_buffer, list);
303 list_del(&buf->list);
304 v4l2_ctrl_request_complete(buf->vb.vb2_buf.req_obj.req,
305 &dev->ctrl_hdl_sdr_cap);
306 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
307 }
308
309 /* shutdown control thread */
310 kthread_stop(dev->kthread_sdr_cap);
311 dev->kthread_sdr_cap = NULL;
312 }
313
314 static void sdr_cap_buf_request_complete(struct vb2_buffer *vb)
315 {
316 struct vivid_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
317
318 v4l2_ctrl_request_complete(vb->req_obj.req, &dev->ctrl_hdl_sdr_cap);
319 }
320
321 const struct vb2_ops vivid_sdr_cap_qops = {
322 .queue_setup = sdr_cap_queue_setup,
323 .buf_prepare = sdr_cap_buf_prepare,
324 .buf_queue = sdr_cap_buf_queue,
325 .start_streaming = sdr_cap_start_streaming,
326 .stop_streaming = sdr_cap_stop_streaming,
327 .buf_request_complete = sdr_cap_buf_request_complete,
328 .wait_prepare = vb2_ops_wait_prepare,
329 .wait_finish = vb2_ops_wait_finish,
330 };
331
332 int vivid_sdr_enum_freq_bands(struct file *file, void *fh,
333 struct v4l2_frequency_band *band)
334 {
335 switch (band->tuner) {
336 case 0:
337 if (band->index >= ARRAY_SIZE(bands_adc))
338 return -EINVAL;
339 *band = bands_adc[band->index];
340 return 0;
341 case 1:
342 if (band->index >= ARRAY_SIZE(bands_fm))
343 return -EINVAL;
344 *band = bands_fm[band->index];
345 return 0;
346 default:
347 return -EINVAL;
348 }
349 }
350
351 int vivid_sdr_g_frequency(struct file *file, void *fh,
352 struct v4l2_frequency *vf)
353 {
354 struct vivid_dev *dev = video_drvdata(file);
355
356 switch (vf->tuner) {
357 case 0:
358 vf->frequency = dev->sdr_adc_freq;
359 vf->type = V4L2_TUNER_ADC;
360 return 0;
361 case 1:
362 vf->frequency = dev->sdr_fm_freq;
363 vf->type = V4L2_TUNER_RF;
364 return 0;
365 default:
366 return -EINVAL;
367 }
368 }
369
370 int vivid_sdr_s_frequency(struct file *file, void *fh,
371 const struct v4l2_frequency *vf)
372 {
373 struct vivid_dev *dev = video_drvdata(file);
374 unsigned freq = vf->frequency;
375 unsigned band;
376
377 switch (vf->tuner) {
378 case 0:
379 if (vf->type != V4L2_TUNER_ADC)
380 return -EINVAL;
381 if (freq < BAND_ADC_0)
382 band = 0;
383 else if (freq < BAND_ADC_1)
384 band = 1;
385 else
386 band = 2;
387
388 freq = clamp_t(unsigned, freq,
389 bands_adc[band].rangelow,
390 bands_adc[band].rangehigh);
391
392 if (vb2_is_streaming(&dev->vb_sdr_cap_q) &&
393 freq != dev->sdr_adc_freq) {
394 /* resync the thread's timings */
395 dev->sdr_cap_seq_resync = true;
396 }
397 dev->sdr_adc_freq = freq;
398 return 0;
399 case 1:
400 if (vf->type != V4L2_TUNER_RF)
401 return -EINVAL;
402 dev->sdr_fm_freq = clamp_t(unsigned, freq,
403 bands_fm[0].rangelow,
404 bands_fm[0].rangehigh);
405 return 0;
406 default:
407 return -EINVAL;
408 }
409 }
410
411 int vivid_sdr_g_tuner(struct file *file, void *fh, struct v4l2_tuner *vt)
412 {
413 switch (vt->index) {
414 case 0:
415 strscpy(vt->name, "ADC", sizeof(vt->name));
416 vt->type = V4L2_TUNER_ADC;
417 vt->capability =
418 V4L2_TUNER_CAP_1HZ | V4L2_TUNER_CAP_FREQ_BANDS;
419 vt->rangelow = bands_adc[0].rangelow;
420 vt->rangehigh = bands_adc[2].rangehigh;
421 return 0;
422 case 1:
423 strscpy(vt->name, "RF", sizeof(vt->name));
424 vt->type = V4L2_TUNER_RF;
425 vt->capability =
426 V4L2_TUNER_CAP_1HZ | V4L2_TUNER_CAP_FREQ_BANDS;
427 vt->rangelow = bands_fm[0].rangelow;
428 vt->rangehigh = bands_fm[0].rangehigh;
429 return 0;
430 default:
431 return -EINVAL;
432 }
433 }
434
435 int vivid_sdr_s_tuner(struct file *file, void *fh, const struct v4l2_tuner *vt)
436 {
437 if (vt->index > 1)
438 return -EINVAL;
439 return 0;
440 }
441
442 int vidioc_enum_fmt_sdr_cap(struct file *file, void *fh, struct v4l2_fmtdesc *f)
443 {
444 if (f->index >= ARRAY_SIZE(formats))
445 return -EINVAL;
446 f->pixelformat = formats[f->index].pixelformat;
447 return 0;
448 }
449
450 int vidioc_g_fmt_sdr_cap(struct file *file, void *fh, struct v4l2_format *f)
451 {
452 struct vivid_dev *dev = video_drvdata(file);
453
454 f->fmt.sdr.pixelformat = dev->sdr_pixelformat;
455 f->fmt.sdr.buffersize = dev->sdr_buffersize;
456 memset(f->fmt.sdr.reserved, 0, sizeof(f->fmt.sdr.reserved));
457 return 0;
458 }
459
460 int vidioc_s_fmt_sdr_cap(struct file *file, void *fh, struct v4l2_format *f)
461 {
462 struct vivid_dev *dev = video_drvdata(file);
463 struct vb2_queue *q = &dev->vb_sdr_cap_q;
464 int i;
465
466 if (vb2_is_busy(q))
467 return -EBUSY;
468
469 memset(f->fmt.sdr.reserved, 0, sizeof(f->fmt.sdr.reserved));
470 for (i = 0; i < ARRAY_SIZE(formats); i++) {
471 if (formats[i].pixelformat == f->fmt.sdr.pixelformat) {
472 dev->sdr_pixelformat = formats[i].pixelformat;
473 dev->sdr_buffersize = formats[i].buffersize;
474 f->fmt.sdr.buffersize = formats[i].buffersize;
475 return 0;
476 }
477 }
478 dev->sdr_pixelformat = formats[0].pixelformat;
479 dev->sdr_buffersize = formats[0].buffersize;
480 f->fmt.sdr.pixelformat = formats[0].pixelformat;
481 f->fmt.sdr.buffersize = formats[0].buffersize;
482 return 0;
483 }
484
485 int vidioc_try_fmt_sdr_cap(struct file *file, void *fh, struct v4l2_format *f)
486 {
487 int i;
488
489 memset(f->fmt.sdr.reserved, 0, sizeof(f->fmt.sdr.reserved));
490 for (i = 0; i < ARRAY_SIZE(formats); i++) {
491 if (formats[i].pixelformat == f->fmt.sdr.pixelformat) {
492 f->fmt.sdr.buffersize = formats[i].buffersize;
493 return 0;
494 }
495 }
496 f->fmt.sdr.pixelformat = formats[0].pixelformat;
497 f->fmt.sdr.buffersize = formats[0].buffersize;
498 return 0;
499 }
500
501 #define FIXP_N (15)
502 #define FIXP_FRAC (1 << FIXP_N)
503 #define FIXP_2PI ((int)(2 * 3.141592653589 * FIXP_FRAC))
504 #define M_100000PI (3.14159 * 100000)
505
506 void vivid_sdr_cap_process(struct vivid_dev *dev, struct vivid_buffer *buf)
507 {
508 u8 *vbuf = vb2_plane_vaddr(&buf->vb.vb2_buf, 0);
509 unsigned long i;
510 unsigned long plane_size = vb2_plane_size(&buf->vb.vb2_buf, 0);
511 s64 s64tmp;
512 s32 src_phase_step;
513 s32 mod_phase_step;
514 s32 fixp_i;
515 s32 fixp_q;
516
517 /* calculate phase step */
518 #define BEEP_FREQ 1000 /* 1kHz beep */
519 src_phase_step = DIV_ROUND_CLOSEST(FIXP_2PI * BEEP_FREQ,
520 dev->sdr_adc_freq);
521
522 for (i = 0; i < plane_size; i += 2) {
523 mod_phase_step = fixp_cos32_rad(dev->sdr_fixp_src_phase,
524 FIXP_2PI) >> (31 - FIXP_N);
525
526 dev->sdr_fixp_src_phase += src_phase_step;
527 s64tmp = (s64) mod_phase_step * dev->sdr_fm_deviation;
528 dev->sdr_fixp_mod_phase += div_s64(s64tmp, M_100000PI);
529
530 /*
531 * Transfer phase angle to [0, 2xPI] in order to avoid variable
532 * overflow and make it suitable for cosine implementation
533 * used, which does not support negative angles.
534 */
535 dev->sdr_fixp_src_phase %= FIXP_2PI;
536 dev->sdr_fixp_mod_phase %= FIXP_2PI;
537
538 if (dev->sdr_fixp_mod_phase < 0)
539 dev->sdr_fixp_mod_phase += FIXP_2PI;
540
541 fixp_i = fixp_cos32_rad(dev->sdr_fixp_mod_phase, FIXP_2PI);
542 fixp_q = fixp_sin32_rad(dev->sdr_fixp_mod_phase, FIXP_2PI);
543
544 /* Normalize fraction values represented with 32 bit precision
545 * to fixed point representation with FIXP_N bits */
546 fixp_i >>= (31 - FIXP_N);
547 fixp_q >>= (31 - FIXP_N);
548
549 switch (dev->sdr_pixelformat) {
550 case V4L2_SDR_FMT_CU8:
551 /* convert 'fixp float' to u8 [0, +255] */
552 /* u8 = X * 127.5 + 127.5; X is float [-1.0, +1.0] */
553 fixp_i = fixp_i * 1275 + FIXP_FRAC * 1275;
554 fixp_q = fixp_q * 1275 + FIXP_FRAC * 1275;
555 *vbuf++ = DIV_ROUND_CLOSEST(fixp_i, FIXP_FRAC * 10);
556 *vbuf++ = DIV_ROUND_CLOSEST(fixp_q, FIXP_FRAC * 10);
557 break;
558 case V4L2_SDR_FMT_CS8:
559 /* convert 'fixp float' to s8 [-128, +127] */
560 /* s8 = X * 127.5 - 0.5; X is float [-1.0, +1.0] */
561 fixp_i = fixp_i * 1275 - FIXP_FRAC * 5;
562 fixp_q = fixp_q * 1275 - FIXP_FRAC * 5;
563 *vbuf++ = DIV_ROUND_CLOSEST(fixp_i, FIXP_FRAC * 10);
564 *vbuf++ = DIV_ROUND_CLOSEST(fixp_q, FIXP_FRAC * 10);
565 break;
566 default:
567 break;
568 }
569 }
570 }
Linux with added FPC-III support