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 #include <linux/jiffies.h>
21
22 #include "vivid-core.h"
23 #include "vivid-ctrls.h"
24 #include "vivid-sdr-cap.h"
25
26 /* stream formats */
27 struct vivid_format {
28 u32 pixelformat;
29 u32 buffersize;
30 };
31
32 /* format descriptions for capture and preview */
33 static const struct vivid_format formats[] = {
34 {
35 .pixelformat = V4L2_SDR_FMT_CU8,
36 .buffersize = SDR_CAP_SAMPLES_PER_BUF * 2,
37 }, {
38 .pixelformat = V4L2_SDR_FMT_CS8,
39 .buffersize = SDR_CAP_SAMPLES_PER_BUF * 2,
40 },
41 };
42
43 static const struct v4l2_frequency_band bands_adc[] = {
44 {
45 .tuner = 0,
46 .type = V4L2_TUNER_ADC,
47 .index = 0,
48 .capability = V4L2_TUNER_CAP_1HZ | V4L2_TUNER_CAP_FREQ_BANDS,
49 .rangelow = 300000,
50 .rangehigh = 300000,
51 },
52 {
53 .tuner = 0,
54 .type = V4L2_TUNER_ADC,
55 .index = 1,
56 .capability = V4L2_TUNER_CAP_1HZ | V4L2_TUNER_CAP_FREQ_BANDS,
57 .rangelow = 900001,
58 .rangehigh = 2800000,
59 },
60 {
61 .tuner = 0,
62 .type = V4L2_TUNER_ADC,
63 .index = 2,
64 .capability = V4L2_TUNER_CAP_1HZ | V4L2_TUNER_CAP_FREQ_BANDS,
65 .rangelow = 3200000,
66 .rangehigh = 3200000,
67 },
68 };
69
70 /* ADC band midpoints */
71 #define BAND_ADC_0 ((bands_adc[0].rangehigh + bands_adc[1].rangelow) / 2)
72 #define BAND_ADC_1 ((bands_adc[1].rangehigh + bands_adc[2].rangelow) / 2)
73
74 static const struct v4l2_frequency_band bands_fm[] = {
75 {
76 .tuner = 1,
77 .type = V4L2_TUNER_RF,
78 .index = 0,
79 .capability = V4L2_TUNER_CAP_1HZ | V4L2_TUNER_CAP_FREQ_BANDS,
80 .rangelow = 50000000,
81 .rangehigh = 2000000000,
82 },
83 };
84
vivid_thread_sdr_cap_tick(struct vivid_dev * dev)85 static void vivid_thread_sdr_cap_tick(struct vivid_dev *dev)
86 {
87 struct vivid_buffer *sdr_cap_buf = NULL;
88
89 dprintk(dev, 1, "SDR Capture Thread Tick\n");
90
91 /* Drop a certain percentage of buffers. */
92 if (dev->perc_dropped_buffers &&
93 get_random_u32_below(100) < dev->perc_dropped_buffers)
94 return;
95
96 spin_lock(&dev->slock);
97 if (!list_empty(&dev->sdr_cap_active)) {
98 sdr_cap_buf = list_entry(dev->sdr_cap_active.next,
99 struct vivid_buffer, list);
100 list_del(&sdr_cap_buf->list);
101 }
102 spin_unlock(&dev->slock);
103
104 if (sdr_cap_buf) {
105 sdr_cap_buf->vb.sequence = dev->sdr_cap_with_seq_wrap_count;
106 v4l2_ctrl_request_setup(sdr_cap_buf->vb.vb2_buf.req_obj.req,
107 &dev->ctrl_hdl_sdr_cap);
108 v4l2_ctrl_request_complete(sdr_cap_buf->vb.vb2_buf.req_obj.req,
109 &dev->ctrl_hdl_sdr_cap);
110 vivid_sdr_cap_process(dev, sdr_cap_buf);
111 sdr_cap_buf->vb.vb2_buf.timestamp =
112 ktime_get_ns() + dev->time_wrap_offset;
113 vb2_buffer_done(&sdr_cap_buf->vb.vb2_buf, dev->dqbuf_error ?
114 VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
115 dev->dqbuf_error = false;
116 }
117 }
118
vivid_thread_sdr_cap(void * data)119 static int vivid_thread_sdr_cap(void *data)
120 {
121 struct vivid_dev *dev = data;
122 u64 samples_since_start;
123 u64 buffers_since_start;
124 u64 next_jiffies_since_start;
125 unsigned long jiffies_since_start;
126 unsigned long cur_jiffies;
127 unsigned wait_jiffies;
128
129 dprintk(dev, 1, "SDR Capture Thread Start\n");
130
131 set_freezable();
132
133 /* Resets frame counters */
134 dev->sdr_cap_seq_offset = 0;
135 dev->sdr_cap_seq_count = 0;
136 dev->jiffies_sdr_cap = jiffies;
137 dev->sdr_cap_seq_resync = false;
138 if (dev->time_wrap)
139 dev->time_wrap_offset = dev->time_wrap - ktime_get_ns();
140 else
141 dev->time_wrap_offset = 0;
142
143 for (;;) {
144 try_to_freeze();
145 if (kthread_should_stop())
146 break;
147
148 if (!mutex_trylock(&dev->mutex)) {
149 schedule();
150 continue;
151 }
152
153 cur_jiffies = jiffies;
154 if (dev->sdr_cap_seq_resync) {
155 dev->jiffies_sdr_cap = cur_jiffies;
156 dev->sdr_cap_seq_offset = dev->sdr_cap_seq_count + 1;
157 dev->sdr_cap_seq_count = 0;
158 dev->sdr_cap_seq_resync = false;
159 }
160 /* Calculate the number of jiffies since we started streaming */
161 jiffies_since_start = cur_jiffies - dev->jiffies_sdr_cap;
162 /* Get the number of buffers streamed since the start */
163 buffers_since_start =
164 (u64)jiffies_since_start * dev->sdr_adc_freq +
165 (HZ * SDR_CAP_SAMPLES_PER_BUF) / 2;
166 do_div(buffers_since_start, HZ * SDR_CAP_SAMPLES_PER_BUF);
167
168 /*
169 * After more than 0xf0000000 (rounded down to a multiple of
170 * 'jiffies-per-day' to ease jiffies_to_msecs calculation)
171 * jiffies have passed since we started streaming reset the
172 * counters and keep track of the sequence offset.
173 */
174 if (jiffies_since_start > JIFFIES_RESYNC) {
175 dev->jiffies_sdr_cap = cur_jiffies;
176 dev->sdr_cap_seq_offset = buffers_since_start;
177 buffers_since_start = 0;
178 }
179 dev->sdr_cap_seq_count =
180 buffers_since_start + dev->sdr_cap_seq_offset;
181 dev->sdr_cap_with_seq_wrap_count = dev->sdr_cap_seq_count - dev->sdr_cap_seq_start;
182
183 vivid_thread_sdr_cap_tick(dev);
184 mutex_unlock(&dev->mutex);
185
186 /*
187 * Calculate the number of samples streamed since we started,
188 * not including the current buffer.
189 */
190 samples_since_start = buffers_since_start * SDR_CAP_SAMPLES_PER_BUF;
191
192 /* And the number of jiffies since we started */
193 jiffies_since_start = jiffies - dev->jiffies_sdr_cap;
194
195 /* Increase by the number of samples in one buffer */
196 samples_since_start += SDR_CAP_SAMPLES_PER_BUF;
197 /*
198 * Calculate when that next buffer is supposed to start
199 * in jiffies since we started streaming.
200 */
201 next_jiffies_since_start = samples_since_start * HZ +
202 dev->sdr_adc_freq / 2;
203 do_div(next_jiffies_since_start, dev->sdr_adc_freq);
204 /* If it is in the past, then just schedule asap */
205 if (next_jiffies_since_start < jiffies_since_start)
206 next_jiffies_since_start = jiffies_since_start;
207
208 wait_jiffies = next_jiffies_since_start - jiffies_since_start;
209 if (!time_is_after_jiffies(cur_jiffies + wait_jiffies))
210 continue;
211
212 wait_queue_head_t wait;
213
214 init_waitqueue_head(&wait);
215 wait_event_interruptible_timeout(wait, kthread_should_stop(),
216 cur_jiffies + wait_jiffies - jiffies);
217 }
218 dprintk(dev, 1, "SDR Capture Thread End\n");
219 return 0;
220 }
221
sdr_cap_queue_setup(struct vb2_queue * vq,unsigned * nbuffers,unsigned * nplanes,unsigned sizes[],struct device * alloc_devs[])222 static int sdr_cap_queue_setup(struct vb2_queue *vq,
223 unsigned *nbuffers, unsigned *nplanes,
224 unsigned sizes[], struct device *alloc_devs[])
225 {
226 /* 2 = max 16-bit sample returned */
227 u32 size = SDR_CAP_SAMPLES_PER_BUF * 2;
228
229 if (*nplanes)
230 return sizes[0] < size ? -EINVAL : 0;
231
232 *nplanes = 1;
233 sizes[0] = size;
234 return 0;
235 }
236
sdr_cap_buf_prepare(struct vb2_buffer * vb)237 static int sdr_cap_buf_prepare(struct vb2_buffer *vb)
238 {
239 struct vivid_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
240 unsigned size = SDR_CAP_SAMPLES_PER_BUF * 2;
241
242 dprintk(dev, 1, "%s\n", __func__);
243
244 if (dev->buf_prepare_error) {
245 /*
246 * Error injection: test what happens if buf_prepare() returns
247 * an error.
248 */
249 dev->buf_prepare_error = false;
250 return -EINVAL;
251 }
252 if (vb2_plane_size(vb, 0) < size) {
253 dprintk(dev, 1, "%s data will not fit into plane (%lu < %u)\n",
254 __func__, vb2_plane_size(vb, 0), size);
255 return -EINVAL;
256 }
257 vb2_set_plane_payload(vb, 0, size);
258
259 return 0;
260 }
261
sdr_cap_buf_queue(struct vb2_buffer * vb)262 static void sdr_cap_buf_queue(struct vb2_buffer *vb)
263 {
264 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
265 struct vivid_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
266 struct vivid_buffer *buf = container_of(vbuf, struct vivid_buffer, vb);
267
268 dprintk(dev, 1, "%s\n", __func__);
269
270 spin_lock(&dev->slock);
271 list_add_tail(&buf->list, &dev->sdr_cap_active);
272 spin_unlock(&dev->slock);
273 }
274
sdr_cap_start_streaming(struct vb2_queue * vq,unsigned count)275 static int sdr_cap_start_streaming(struct vb2_queue *vq, unsigned count)
276 {
277 struct vivid_dev *dev = vb2_get_drv_priv(vq);
278 int err = 0;
279
280 dprintk(dev, 1, "%s\n", __func__);
281 dev->sdr_cap_seq_start = dev->seq_wrap * 128;
282 if (dev->start_streaming_error) {
283 dev->start_streaming_error = false;
284 err = -EINVAL;
285 } else if (dev->kthread_sdr_cap == NULL) {
286 dev->kthread_sdr_cap = kthread_run(vivid_thread_sdr_cap, dev,
287 "%s-sdr-cap", dev->v4l2_dev.name);
288
289 if (IS_ERR(dev->kthread_sdr_cap)) {
290 v4l2_err(&dev->v4l2_dev, "kernel_thread() failed\n");
291 err = PTR_ERR(dev->kthread_sdr_cap);
292 dev->kthread_sdr_cap = NULL;
293 }
294 }
295 if (err) {
296 struct vivid_buffer *buf, *tmp;
297
298 list_for_each_entry_safe(buf, tmp, &dev->sdr_cap_active, list) {
299 list_del(&buf->list);
300 vb2_buffer_done(&buf->vb.vb2_buf,
301 VB2_BUF_STATE_QUEUED);
302 }
303 }
304 return err;
305 }
306
307 /* abort streaming and wait for last buffer */
sdr_cap_stop_streaming(struct vb2_queue * vq)308 static void sdr_cap_stop_streaming(struct vb2_queue *vq)
309 {
310 struct vivid_dev *dev = vb2_get_drv_priv(vq);
311
312 if (dev->kthread_sdr_cap == NULL)
313 return;
314
315 while (!list_empty(&dev->sdr_cap_active)) {
316 struct vivid_buffer *buf;
317
318 buf = list_entry(dev->sdr_cap_active.next,
319 struct vivid_buffer, list);
320 list_del(&buf->list);
321 v4l2_ctrl_request_complete(buf->vb.vb2_buf.req_obj.req,
322 &dev->ctrl_hdl_sdr_cap);
323 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
324 }
325
326 /* shutdown control thread */
327 kthread_stop(dev->kthread_sdr_cap);
328 dev->kthread_sdr_cap = NULL;
329 }
330
sdr_cap_buf_request_complete(struct vb2_buffer * vb)331 static void sdr_cap_buf_request_complete(struct vb2_buffer *vb)
332 {
333 struct vivid_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
334
335 v4l2_ctrl_request_complete(vb->req_obj.req, &dev->ctrl_hdl_sdr_cap);
336 }
337
338 const struct vb2_ops vivid_sdr_cap_qops = {
339 .queue_setup = sdr_cap_queue_setup,
340 .buf_prepare = sdr_cap_buf_prepare,
341 .buf_queue = sdr_cap_buf_queue,
342 .start_streaming = sdr_cap_start_streaming,
343 .stop_streaming = sdr_cap_stop_streaming,
344 .buf_request_complete = sdr_cap_buf_request_complete,
345 };
346
vivid_sdr_enum_freq_bands(struct file * file,void * fh,struct v4l2_frequency_band * band)347 int vivid_sdr_enum_freq_bands(struct file *file, void *fh,
348 struct v4l2_frequency_band *band)
349 {
350 switch (band->tuner) {
351 case 0:
352 if (band->index >= ARRAY_SIZE(bands_adc))
353 return -EINVAL;
354 *band = bands_adc[band->index];
355 return 0;
356 case 1:
357 if (band->index >= ARRAY_SIZE(bands_fm))
358 return -EINVAL;
359 *band = bands_fm[band->index];
360 return 0;
361 default:
362 return -EINVAL;
363 }
364 }
365
vivid_sdr_g_frequency(struct file * file,void * fh,struct v4l2_frequency * vf)366 int vivid_sdr_g_frequency(struct file *file, void *fh,
367 struct v4l2_frequency *vf)
368 {
369 struct vivid_dev *dev = video_drvdata(file);
370
371 switch (vf->tuner) {
372 case 0:
373 vf->frequency = dev->sdr_adc_freq;
374 vf->type = V4L2_TUNER_ADC;
375 return 0;
376 case 1:
377 vf->frequency = dev->sdr_fm_freq;
378 vf->type = V4L2_TUNER_RF;
379 return 0;
380 default:
381 return -EINVAL;
382 }
383 }
384
vivid_sdr_s_frequency(struct file * file,void * fh,const struct v4l2_frequency * vf)385 int vivid_sdr_s_frequency(struct file *file, void *fh,
386 const struct v4l2_frequency *vf)
387 {
388 struct vivid_dev *dev = video_drvdata(file);
389 unsigned freq = vf->frequency;
390 unsigned band;
391
392 switch (vf->tuner) {
393 case 0:
394 if (vf->type != V4L2_TUNER_ADC)
395 return -EINVAL;
396 if (freq < BAND_ADC_0)
397 band = 0;
398 else if (freq < BAND_ADC_1)
399 band = 1;
400 else
401 band = 2;
402
403 freq = clamp_t(unsigned, freq,
404 bands_adc[band].rangelow,
405 bands_adc[band].rangehigh);
406
407 if (vb2_is_streaming(&dev->vb_sdr_cap_q) &&
408 freq != dev->sdr_adc_freq) {
409 /* resync the thread's timings */
410 dev->sdr_cap_seq_resync = true;
411 }
412 dev->sdr_adc_freq = freq;
413 return 0;
414 case 1:
415 if (vf->type != V4L2_TUNER_RF)
416 return -EINVAL;
417 dev->sdr_fm_freq = clamp_t(unsigned, freq,
418 bands_fm[0].rangelow,
419 bands_fm[0].rangehigh);
420 return 0;
421 default:
422 return -EINVAL;
423 }
424 }
425
vivid_sdr_g_tuner(struct file * file,void * fh,struct v4l2_tuner * vt)426 int vivid_sdr_g_tuner(struct file *file, void *fh, struct v4l2_tuner *vt)
427 {
428 switch (vt->index) {
429 case 0:
430 strscpy(vt->name, "ADC", sizeof(vt->name));
431 vt->type = V4L2_TUNER_ADC;
432 vt->capability =
433 V4L2_TUNER_CAP_1HZ | V4L2_TUNER_CAP_FREQ_BANDS;
434 vt->rangelow = bands_adc[0].rangelow;
435 vt->rangehigh = bands_adc[2].rangehigh;
436 return 0;
437 case 1:
438 strscpy(vt->name, "RF", sizeof(vt->name));
439 vt->type = V4L2_TUNER_RF;
440 vt->capability =
441 V4L2_TUNER_CAP_1HZ | V4L2_TUNER_CAP_FREQ_BANDS;
442 vt->rangelow = bands_fm[0].rangelow;
443 vt->rangehigh = bands_fm[0].rangehigh;
444 return 0;
445 default:
446 return -EINVAL;
447 }
448 }
449
vivid_sdr_s_tuner(struct file * file,void * fh,const struct v4l2_tuner * vt)450 int vivid_sdr_s_tuner(struct file *file, void *fh, const struct v4l2_tuner *vt)
451 {
452 if (vt->index > 1)
453 return -EINVAL;
454 return 0;
455 }
456
vidioc_enum_fmt_sdr_cap(struct file * file,void * fh,struct v4l2_fmtdesc * f)457 int vidioc_enum_fmt_sdr_cap(struct file *file, void *fh, struct v4l2_fmtdesc *f)
458 {
459 if (f->index >= ARRAY_SIZE(formats))
460 return -EINVAL;
461 f->pixelformat = formats[f->index].pixelformat;
462 return 0;
463 }
464
vidioc_g_fmt_sdr_cap(struct file * file,void * fh,struct v4l2_format * f)465 int vidioc_g_fmt_sdr_cap(struct file *file, void *fh, struct v4l2_format *f)
466 {
467 struct vivid_dev *dev = video_drvdata(file);
468
469 f->fmt.sdr.pixelformat = dev->sdr_pixelformat;
470 f->fmt.sdr.buffersize = dev->sdr_buffersize;
471 return 0;
472 }
473
vidioc_s_fmt_sdr_cap(struct file * file,void * fh,struct v4l2_format * f)474 int vidioc_s_fmt_sdr_cap(struct file *file, void *fh, struct v4l2_format *f)
475 {
476 struct vivid_dev *dev = video_drvdata(file);
477 struct vb2_queue *q = &dev->vb_sdr_cap_q;
478 int i;
479
480 if (vb2_is_busy(q))
481 return -EBUSY;
482
483 for (i = 0; i < ARRAY_SIZE(formats); i++) {
484 if (formats[i].pixelformat == f->fmt.sdr.pixelformat) {
485 dev->sdr_pixelformat = formats[i].pixelformat;
486 dev->sdr_buffersize = formats[i].buffersize;
487 f->fmt.sdr.buffersize = formats[i].buffersize;
488 return 0;
489 }
490 }
491 dev->sdr_pixelformat = formats[0].pixelformat;
492 dev->sdr_buffersize = formats[0].buffersize;
493 f->fmt.sdr.pixelformat = formats[0].pixelformat;
494 f->fmt.sdr.buffersize = formats[0].buffersize;
495 return 0;
496 }
497
vidioc_try_fmt_sdr_cap(struct file * file,void * fh,struct v4l2_format * f)498 int vidioc_try_fmt_sdr_cap(struct file *file, void *fh, struct v4l2_format *f)
499 {
500 int i;
501
502 for (i = 0; i < ARRAY_SIZE(formats); i++) {
503 if (formats[i].pixelformat == f->fmt.sdr.pixelformat) {
504 f->fmt.sdr.buffersize = formats[i].buffersize;
505 return 0;
506 }
507 }
508 f->fmt.sdr.pixelformat = formats[0].pixelformat;
509 f->fmt.sdr.buffersize = formats[0].buffersize;
510 return 0;
511 }
512
513 #define FIXP_N (15)
514 #define FIXP_FRAC (1 << FIXP_N)
515 #define FIXP_2PI ((int)(2 * 3.141592653589 * FIXP_FRAC))
516 #define M_100000PI (3.14159 * 100000)
517
vivid_sdr_cap_process(struct vivid_dev * dev,struct vivid_buffer * buf)518 void vivid_sdr_cap_process(struct vivid_dev *dev, struct vivid_buffer *buf)
519 {
520 u8 *vbuf = vb2_plane_vaddr(&buf->vb.vb2_buf, 0);
521 unsigned long i;
522 unsigned long plane_size = vb2_plane_size(&buf->vb.vb2_buf, 0);
523 s64 s64tmp;
524 s32 src_phase_step;
525 s32 mod_phase_step;
526 s32 fixp_i;
527 s32 fixp_q;
528
529 /* calculate phase step */
530 #define BEEP_FREQ 1000 /* 1kHz beep */
531 src_phase_step = DIV_ROUND_CLOSEST(FIXP_2PI * BEEP_FREQ,
532 dev->sdr_adc_freq);
533
534 for (i = 0; i < plane_size; i += 2) {
535 mod_phase_step = fixp_cos32_rad(dev->sdr_fixp_src_phase,
536 FIXP_2PI) >> (31 - FIXP_N);
537
538 dev->sdr_fixp_src_phase += src_phase_step;
539 s64tmp = (s64) mod_phase_step * dev->sdr_fm_deviation;
540 dev->sdr_fixp_mod_phase += div_s64(s64tmp, M_100000PI);
541
542 /*
543 * Transfer phase angle to [0, 2xPI] in order to avoid variable
544 * overflow and make it suitable for cosine implementation
545 * used, which does not support negative angles.
546 */
547 dev->sdr_fixp_src_phase %= FIXP_2PI;
548 dev->sdr_fixp_mod_phase %= FIXP_2PI;
549
550 if (dev->sdr_fixp_mod_phase < 0)
551 dev->sdr_fixp_mod_phase += FIXP_2PI;
552
553 fixp_i = fixp_cos32_rad(dev->sdr_fixp_mod_phase, FIXP_2PI);
554 fixp_q = fixp_sin32_rad(dev->sdr_fixp_mod_phase, FIXP_2PI);
555
556 /* Normalize fraction values represented with 32 bit precision
557 * to fixed point representation with FIXP_N bits */
558 fixp_i >>= (31 - FIXP_N);
559 fixp_q >>= (31 - FIXP_N);
560
561 switch (dev->sdr_pixelformat) {
562 case V4L2_SDR_FMT_CU8:
563 /* convert 'fixp float' to u8 [0, +255] */
564 /* u8 = X * 127.5 + 127.5; X is float [-1.0, +1.0] */
565 fixp_i = fixp_i * 1275 + FIXP_FRAC * 1275;
566 fixp_q = fixp_q * 1275 + FIXP_FRAC * 1275;
567 *vbuf++ = DIV_ROUND_CLOSEST(fixp_i, FIXP_FRAC * 10);
568 *vbuf++ = DIV_ROUND_CLOSEST(fixp_q, FIXP_FRAC * 10);
569 break;
570 case V4L2_SDR_FMT_CS8:
571 /* convert 'fixp float' to s8 [-128, +127] */
572 /* s8 = X * 127.5 - 0.5; X is float [-1.0, +1.0] */
573 fixp_i = fixp_i * 1275 - FIXP_FRAC * 5;
574 fixp_q = fixp_q * 1275 - FIXP_FRAC * 5;
575 *vbuf++ = DIV_ROUND_CLOSEST(fixp_i, FIXP_FRAC * 10);
576 *vbuf++ = DIV_ROUND_CLOSEST(fixp_q, FIXP_FRAC * 10);
577 break;
578 default:
579 break;
580 }
581 }
582 }
583