1 /*
2 * vivid-sdr-cap.c - software defined radio support functions.
3 *
4 * Copyright 2014 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
5 *
6 * This program is free software; you may redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; version 2 of the License.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
11 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
12 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
13 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
14 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
15 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
16 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
17 * SOFTWARE.
18 */
19
20 #include <linux/errno.h>
21 #include <linux/kernel.h>
22 #include <linux/delay.h>
23 #include <linux/kthread.h>
24 #include <linux/freezer.h>
25 #include <linux/math64.h>
26 #include <linux/videodev2.h>
27 #include <linux/v4l2-dv-timings.h>
28 #include <media/v4l2-common.h>
29 #include <media/v4l2-event.h>
30 #include <media/v4l2-dv-timings.h>
31 #include <linux/fixp-arith.h>
32
33 #include "vivid-core.h"
34 #include "vivid-ctrls.h"
35 #include "vivid-sdr-cap.h"
36
37 /* stream formats */
38 struct vivid_format {
39 u32 pixelformat;
40 u32 buffersize;
41 };
42
43 /* format descriptions for capture and preview */
44 static const struct vivid_format formats[] = {
45 {
46 .pixelformat = V4L2_SDR_FMT_CU8,
47 .buffersize = SDR_CAP_SAMPLES_PER_BUF * 2,
48 }, {
49 .pixelformat = V4L2_SDR_FMT_CS8,
50 .buffersize = SDR_CAP_SAMPLES_PER_BUF * 2,
51 },
52 };
53
54 static const unsigned int NUM_FORMATS = ARRAY_SIZE(formats);
55
56 static const struct v4l2_frequency_band bands_adc[] = {
57 {
58 .tuner = 0,
59 .type = V4L2_TUNER_ADC,
60 .index = 0,
61 .capability = V4L2_TUNER_CAP_1HZ | V4L2_TUNER_CAP_FREQ_BANDS,
62 .rangelow = 300000,
63 .rangehigh = 300000,
64 },
65 {
66 .tuner = 0,
67 .type = V4L2_TUNER_ADC,
68 .index = 1,
69 .capability = V4L2_TUNER_CAP_1HZ | V4L2_TUNER_CAP_FREQ_BANDS,
70 .rangelow = 900001,
71 .rangehigh = 2800000,
72 },
73 {
74 .tuner = 0,
75 .type = V4L2_TUNER_ADC,
76 .index = 2,
77 .capability = V4L2_TUNER_CAP_1HZ | V4L2_TUNER_CAP_FREQ_BANDS,
78 .rangelow = 3200000,
79 .rangehigh = 3200000,
80 },
81 };
82
83 /* ADC band midpoints */
84 #define BAND_ADC_0 ((bands_adc[0].rangehigh + bands_adc[1].rangelow) / 2)
85 #define BAND_ADC_1 ((bands_adc[1].rangehigh + bands_adc[2].rangelow) / 2)
86
87 static const struct v4l2_frequency_band bands_fm[] = {
88 {
89 .tuner = 1,
90 .type = V4L2_TUNER_RF,
91 .index = 0,
92 .capability = V4L2_TUNER_CAP_1HZ | V4L2_TUNER_CAP_FREQ_BANDS,
93 .rangelow = 50000000,
94 .rangehigh = 2000000000,
95 },
96 };
97
vivid_thread_sdr_cap_tick(struct vivid_dev * dev)98 static void vivid_thread_sdr_cap_tick(struct vivid_dev *dev)
99 {
100 struct vivid_buffer *sdr_cap_buf = NULL;
101
102 dprintk(dev, 1, "SDR Capture Thread Tick\n");
103
104 /* Drop a certain percentage of buffers. */
105 if (dev->perc_dropped_buffers &&
106 prandom_u32_max(100) < dev->perc_dropped_buffers)
107 return;
108
109 spin_lock(&dev->slock);
110 if (!list_empty(&dev->sdr_cap_active)) {
111 sdr_cap_buf = list_entry(dev->sdr_cap_active.next,
112 struct vivid_buffer, list);
113 list_del(&sdr_cap_buf->list);
114 }
115 spin_unlock(&dev->slock);
116
117 if (sdr_cap_buf) {
118 sdr_cap_buf->vb.sequence = dev->sdr_cap_seq_count;
119 vivid_sdr_cap_process(dev, sdr_cap_buf);
120 v4l2_get_timestamp(&sdr_cap_buf->vb.timestamp);
121 sdr_cap_buf->vb.timestamp.tv_sec += dev->time_wrap_offset;
122 vb2_buffer_done(&sdr_cap_buf->vb.vb2_buf, dev->dqbuf_error ?
123 VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
124 dev->dqbuf_error = false;
125 }
126 }
127
vivid_thread_sdr_cap(void * data)128 static int vivid_thread_sdr_cap(void *data)
129 {
130 struct vivid_dev *dev = data;
131 u64 samples_since_start;
132 u64 buffers_since_start;
133 u64 next_jiffies_since_start;
134 unsigned long jiffies_since_start;
135 unsigned long cur_jiffies;
136 unsigned wait_jiffies;
137
138 dprintk(dev, 1, "SDR Capture Thread Start\n");
139
140 set_freezable();
141
142 /* Resets frame counters */
143 dev->sdr_cap_seq_offset = 0;
144 if (dev->seq_wrap)
145 dev->sdr_cap_seq_offset = 0xffffff80U;
146 dev->jiffies_sdr_cap = jiffies;
147 dev->sdr_cap_seq_resync = false;
148
149 for (;;) {
150 try_to_freeze();
151 if (kthread_should_stop())
152 break;
153
154 if (!mutex_trylock(&dev->mutex)) {
155 schedule_timeout_uninterruptible(1);
156 continue;
157 }
158
159 cur_jiffies = jiffies;
160 if (dev->sdr_cap_seq_resync) {
161 dev->jiffies_sdr_cap = cur_jiffies;
162 dev->sdr_cap_seq_offset = dev->sdr_cap_seq_count + 1;
163 dev->sdr_cap_seq_count = 0;
164 dev->sdr_cap_seq_resync = false;
165 }
166 /* Calculate the number of jiffies since we started streaming */
167 jiffies_since_start = cur_jiffies - dev->jiffies_sdr_cap;
168 /* Get the number of buffers streamed since the start */
169 buffers_since_start =
170 (u64)jiffies_since_start * dev->sdr_adc_freq +
171 (HZ * SDR_CAP_SAMPLES_PER_BUF) / 2;
172 do_div(buffers_since_start, HZ * SDR_CAP_SAMPLES_PER_BUF);
173
174 /*
175 * After more than 0xf0000000 (rounded down to a multiple of
176 * 'jiffies-per-day' to ease jiffies_to_msecs calculation)
177 * jiffies have passed since we started streaming reset the
178 * counters and keep track of the sequence offset.
179 */
180 if (jiffies_since_start > JIFFIES_RESYNC) {
181 dev->jiffies_sdr_cap = cur_jiffies;
182 dev->sdr_cap_seq_offset = buffers_since_start;
183 buffers_since_start = 0;
184 }
185 dev->sdr_cap_seq_count =
186 buffers_since_start + dev->sdr_cap_seq_offset;
187
188 vivid_thread_sdr_cap_tick(dev);
189 mutex_unlock(&dev->mutex);
190
191 /*
192 * Calculate the number of samples streamed since we started,
193 * not including the current buffer.
194 */
195 samples_since_start = buffers_since_start * SDR_CAP_SAMPLES_PER_BUF;
196
197 /* And the number of jiffies since we started */
198 jiffies_since_start = jiffies - dev->jiffies_sdr_cap;
199
200 /* Increase by the number of samples in one buffer */
201 samples_since_start += SDR_CAP_SAMPLES_PER_BUF;
202 /*
203 * Calculate when that next buffer is supposed to start
204 * in jiffies since we started streaming.
205 */
206 next_jiffies_since_start = samples_since_start * HZ +
207 dev->sdr_adc_freq / 2;
208 do_div(next_jiffies_since_start, dev->sdr_adc_freq);
209 /* If it is in the past, then just schedule asap */
210 if (next_jiffies_since_start < jiffies_since_start)
211 next_jiffies_since_start = jiffies_since_start;
212
213 wait_jiffies = next_jiffies_since_start - jiffies_since_start;
214 schedule_timeout_interruptible(wait_jiffies ? wait_jiffies : 1);
215 }
216 dprintk(dev, 1, "SDR Capture Thread End\n");
217 return 0;
218 }
219
sdr_cap_queue_setup(struct vb2_queue * vq,const void * parg,unsigned * nbuffers,unsigned * nplanes,unsigned sizes[],void * alloc_ctxs[])220 static int sdr_cap_queue_setup(struct vb2_queue *vq, const void *parg,
221 unsigned *nbuffers, unsigned *nplanes,
222 unsigned sizes[], void *alloc_ctxs[])
223 {
224 /* 2 = max 16-bit sample returned */
225 sizes[0] = SDR_CAP_SAMPLES_PER_BUF * 2;
226 *nplanes = 1;
227 return 0;
228 }
229
sdr_cap_buf_prepare(struct vb2_buffer * vb)230 static int sdr_cap_buf_prepare(struct vb2_buffer *vb)
231 {
232 struct vivid_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
233 unsigned size = SDR_CAP_SAMPLES_PER_BUF * 2;
234
235 dprintk(dev, 1, "%s\n", __func__);
236
237 if (dev->buf_prepare_error) {
238 /*
239 * Error injection: test what happens if buf_prepare() returns
240 * an error.
241 */
242 dev->buf_prepare_error = false;
243 return -EINVAL;
244 }
245 if (vb2_plane_size(vb, 0) < size) {
246 dprintk(dev, 1, "%s data will not fit into plane (%lu < %u)\n",
247 __func__, vb2_plane_size(vb, 0), size);
248 return -EINVAL;
249 }
250 vb2_set_plane_payload(vb, 0, size);
251
252 return 0;
253 }
254
sdr_cap_buf_queue(struct vb2_buffer * vb)255 static void sdr_cap_buf_queue(struct vb2_buffer *vb)
256 {
257 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
258 struct vivid_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
259 struct vivid_buffer *buf = container_of(vbuf, struct vivid_buffer, vb);
260
261 dprintk(dev, 1, "%s\n", __func__);
262
263 spin_lock(&dev->slock);
264 list_add_tail(&buf->list, &dev->sdr_cap_active);
265 spin_unlock(&dev->slock);
266 }
267
sdr_cap_start_streaming(struct vb2_queue * vq,unsigned count)268 static int sdr_cap_start_streaming(struct vb2_queue *vq, unsigned count)
269 {
270 struct vivid_dev *dev = vb2_get_drv_priv(vq);
271 int err = 0;
272
273 dprintk(dev, 1, "%s\n", __func__);
274 dev->sdr_cap_seq_count = 0;
275 if (dev->start_streaming_error) {
276 dev->start_streaming_error = false;
277 err = -EINVAL;
278 } else if (dev->kthread_sdr_cap == NULL) {
279 dev->kthread_sdr_cap = kthread_run(vivid_thread_sdr_cap, dev,
280 "%s-sdr-cap", dev->v4l2_dev.name);
281
282 if (IS_ERR(dev->kthread_sdr_cap)) {
283 v4l2_err(&dev->v4l2_dev, "kernel_thread() failed\n");
284 err = PTR_ERR(dev->kthread_sdr_cap);
285 dev->kthread_sdr_cap = NULL;
286 }
287 }
288 if (err) {
289 struct vivid_buffer *buf, *tmp;
290
291 list_for_each_entry_safe(buf, tmp, &dev->sdr_cap_active, list) {
292 list_del(&buf->list);
293 vb2_buffer_done(&buf->vb.vb2_buf,
294 VB2_BUF_STATE_QUEUED);
295 }
296 }
297 return err;
298 }
299
300 /* abort streaming and wait for last buffer */
sdr_cap_stop_streaming(struct vb2_queue * vq)301 static void sdr_cap_stop_streaming(struct vb2_queue *vq)
302 {
303 struct vivid_dev *dev = vb2_get_drv_priv(vq);
304
305 if (dev->kthread_sdr_cap == NULL)
306 return;
307
308 while (!list_empty(&dev->sdr_cap_active)) {
309 struct vivid_buffer *buf;
310
311 buf = list_entry(dev->sdr_cap_active.next,
312 struct vivid_buffer, list);
313 list_del(&buf->list);
314 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
315 }
316
317 /* shutdown control thread */
318 kthread_stop(dev->kthread_sdr_cap);
319 dev->kthread_sdr_cap = NULL;
320 }
321
322 const struct vb2_ops vivid_sdr_cap_qops = {
323 .queue_setup = sdr_cap_queue_setup,
324 .buf_prepare = sdr_cap_buf_prepare,
325 .buf_queue = sdr_cap_buf_queue,
326 .start_streaming = sdr_cap_start_streaming,
327 .stop_streaming = sdr_cap_stop_streaming,
328 .wait_prepare = vb2_ops_wait_prepare,
329 .wait_finish = vb2_ops_wait_finish,
330 };
331
vivid_sdr_enum_freq_bands(struct file * file,void * fh,struct v4l2_frequency_band * band)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
vivid_sdr_g_frequency(struct file * file,void * fh,struct v4l2_frequency * vf)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
vivid_sdr_s_frequency(struct file * file,void * fh,const struct v4l2_frequency * vf)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
vivid_sdr_g_tuner(struct file * file,void * fh,struct v4l2_tuner * vt)411 int vivid_sdr_g_tuner(struct file *file, void *fh, struct v4l2_tuner *vt)
412 {
413 switch (vt->index) {
414 case 0:
415 strlcpy(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 strlcpy(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
vivid_sdr_s_tuner(struct file * file,void * fh,const struct v4l2_tuner * vt)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
vidioc_enum_fmt_sdr_cap(struct file * file,void * fh,struct v4l2_fmtdesc * f)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
vidioc_g_fmt_sdr_cap(struct file * file,void * fh,struct v4l2_format * f)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
vidioc_s_fmt_sdr_cap(struct file * file,void * fh,struct v4l2_format * f)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
vidioc_try_fmt_sdr_cap(struct file * file,void * fh,struct v4l2_format * f)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
vivid_sdr_cap_process(struct vivid_dev * dev,struct vivid_buffer * buf)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 }
571