1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * FM Driver for Connectivity chip of Texas Instruments.
4 * This file provides interfaces to V4L2 subsystem.
5 *
6 * This module registers with V4L2 subsystem as Radio
7 * data system interface (/dev/radio). During the registration,
8 * it will expose two set of function pointers.
9 *
10 * 1) File operation related API (open, close, read, write, poll...etc).
11 * 2) Set of V4L2 IOCTL complaint API.
12 *
13 * Copyright (C) 2011 Texas Instruments
14 * Author: Raja Mani <raja_mani@ti.com>
15 * Author: Manjunatha Halli <manjunatha_halli@ti.com>
16 */
17
18 #include <linux/export.h>
19
20 #include "fmdrv.h"
21 #include "fmdrv_v4l2.h"
22 #include "fmdrv_common.h"
23 #include "fmdrv_rx.h"
24 #include "fmdrv_tx.h"
25
26 static struct video_device gradio_dev;
27 static u8 radio_disconnected;
28
29 /* -- V4L2 RADIO (/dev/radioX) device file operation interfaces --- */
30
31 /* Read RX RDS data */
fm_v4l2_fops_read(struct file * file,char __user * buf,size_t count,loff_t * ppos)32 static ssize_t fm_v4l2_fops_read(struct file *file, char __user * buf,
33 size_t count, loff_t *ppos)
34 {
35 u8 rds_mode;
36 int ret;
37 struct fmdev *fmdev;
38
39 fmdev = video_drvdata(file);
40
41 if (!radio_disconnected) {
42 fmerr("FM device is already disconnected\n");
43 return -EIO;
44 }
45
46 if (mutex_lock_interruptible(&fmdev->mutex))
47 return -ERESTARTSYS;
48
49 /* Turn on RDS mode if it is disabled */
50 ret = fm_rx_get_rds_mode(fmdev, &rds_mode);
51 if (ret < 0) {
52 fmerr("Unable to read current rds mode\n");
53 goto read_unlock;
54 }
55
56 if (rds_mode == FM_RDS_DISABLE) {
57 ret = fmc_set_rds_mode(fmdev, FM_RDS_ENABLE);
58 if (ret < 0) {
59 fmerr("Failed to enable rds mode\n");
60 goto read_unlock;
61 }
62 }
63
64 /* Copy RDS data from internal buffer to user buffer */
65 ret = fmc_transfer_rds_from_internal_buff(fmdev, file, buf, count);
66 read_unlock:
67 mutex_unlock(&fmdev->mutex);
68 return ret;
69 }
70
71 /* Write TX RDS data */
fm_v4l2_fops_write(struct file * file,const char __user * buf,size_t count,loff_t * ppos)72 static ssize_t fm_v4l2_fops_write(struct file *file, const char __user * buf,
73 size_t count, loff_t *ppos)
74 {
75 struct tx_rds rds;
76 int ret;
77 struct fmdev *fmdev;
78
79 ret = copy_from_user(&rds, buf, sizeof(rds));
80 rds.text[sizeof(rds.text) - 1] = '\0';
81 fmdbg("(%d)type: %d, text %s, af %d\n",
82 ret, rds.text_type, rds.text, rds.af_freq);
83 if (ret)
84 return -EFAULT;
85
86 fmdev = video_drvdata(file);
87 if (mutex_lock_interruptible(&fmdev->mutex))
88 return -ERESTARTSYS;
89 fm_tx_set_radio_text(fmdev, rds.text, rds.text_type);
90 fm_tx_set_af(fmdev, rds.af_freq);
91 mutex_unlock(&fmdev->mutex);
92
93 return sizeof(rds);
94 }
95
fm_v4l2_fops_poll(struct file * file,struct poll_table_struct * pts)96 static __poll_t fm_v4l2_fops_poll(struct file *file, struct poll_table_struct *pts)
97 {
98 int ret;
99 struct fmdev *fmdev;
100
101 fmdev = video_drvdata(file);
102 mutex_lock(&fmdev->mutex);
103 ret = fmc_is_rds_data_available(fmdev, file, pts);
104 mutex_unlock(&fmdev->mutex);
105 if (ret < 0)
106 return EPOLLIN | EPOLLRDNORM;
107
108 return 0;
109 }
110
111 /*
112 * Handle open request for "/dev/radioX" device.
113 * Start with FM RX mode as default.
114 */
fm_v4l2_fops_open(struct file * file)115 static int fm_v4l2_fops_open(struct file *file)
116 {
117 int ret;
118 struct fmdev *fmdev = NULL;
119
120 /* Don't allow multiple open */
121 if (radio_disconnected) {
122 fmerr("FM device is already opened\n");
123 return -EBUSY;
124 }
125
126 fmdev = video_drvdata(file);
127
128 if (mutex_lock_interruptible(&fmdev->mutex))
129 return -ERESTARTSYS;
130 ret = fmc_prepare(fmdev);
131 if (ret < 0) {
132 fmerr("Unable to prepare FM CORE\n");
133 goto open_unlock;
134 }
135
136 fmdbg("Load FM RX firmware..\n");
137
138 ret = fmc_set_mode(fmdev, FM_MODE_RX);
139 if (ret < 0) {
140 fmerr("Unable to load FM RX firmware\n");
141 goto open_unlock;
142 }
143 radio_disconnected = 1;
144
145 open_unlock:
146 mutex_unlock(&fmdev->mutex);
147 return ret;
148 }
149
fm_v4l2_fops_release(struct file * file)150 static int fm_v4l2_fops_release(struct file *file)
151 {
152 int ret;
153 struct fmdev *fmdev;
154
155 fmdev = video_drvdata(file);
156 if (!radio_disconnected) {
157 fmdbg("FM device is already closed\n");
158 return 0;
159 }
160
161 mutex_lock(&fmdev->mutex);
162 ret = fmc_set_mode(fmdev, FM_MODE_OFF);
163 if (ret < 0) {
164 fmerr("Unable to turn off the chip\n");
165 goto release_unlock;
166 }
167
168 ret = fmc_release(fmdev);
169 if (ret < 0) {
170 fmerr("FM CORE release failed\n");
171 goto release_unlock;
172 }
173 radio_disconnected = 0;
174
175 release_unlock:
176 mutex_unlock(&fmdev->mutex);
177 return ret;
178 }
179
180 /* V4L2 RADIO (/dev/radioX) device IOCTL interfaces */
fm_v4l2_vidioc_querycap(struct file * file,void * priv,struct v4l2_capability * capability)181 static int fm_v4l2_vidioc_querycap(struct file *file, void *priv,
182 struct v4l2_capability *capability)
183 {
184 strscpy(capability->driver, FM_DRV_NAME, sizeof(capability->driver));
185 strscpy(capability->card, FM_DRV_CARD_SHORT_NAME,
186 sizeof(capability->card));
187 sprintf(capability->bus_info, "UART");
188 return 0;
189 }
190
fm_g_volatile_ctrl(struct v4l2_ctrl * ctrl)191 static int fm_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
192 {
193 struct fmdev *fmdev = container_of(ctrl->handler,
194 struct fmdev, ctrl_handler);
195
196 switch (ctrl->id) {
197 case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
198 ctrl->val = fm_tx_get_tune_cap_val(fmdev);
199 break;
200 default:
201 fmwarn("%s: Unknown IOCTL: %d\n", __func__, ctrl->id);
202 break;
203 }
204
205 return 0;
206 }
207
fm_v4l2_s_ctrl(struct v4l2_ctrl * ctrl)208 static int fm_v4l2_s_ctrl(struct v4l2_ctrl *ctrl)
209 {
210 struct fmdev *fmdev = container_of(ctrl->handler,
211 struct fmdev, ctrl_handler);
212
213 switch (ctrl->id) {
214 case V4L2_CID_AUDIO_VOLUME: /* set volume */
215 return fm_rx_set_volume(fmdev, (u16)ctrl->val);
216
217 case V4L2_CID_AUDIO_MUTE: /* set mute */
218 return fmc_set_mute_mode(fmdev, (u8)ctrl->val);
219
220 case V4L2_CID_TUNE_POWER_LEVEL:
221 /* set TX power level - ext control */
222 return fm_tx_set_pwr_lvl(fmdev, (u8)ctrl->val);
223
224 case V4L2_CID_TUNE_PREEMPHASIS:
225 return fm_tx_set_preemph_filter(fmdev, (u8) ctrl->val);
226
227 default:
228 return -EINVAL;
229 }
230 }
231
fm_v4l2_vidioc_g_audio(struct file * file,void * priv,struct v4l2_audio * audio)232 static int fm_v4l2_vidioc_g_audio(struct file *file, void *priv,
233 struct v4l2_audio *audio)
234 {
235 memset(audio, 0, sizeof(*audio));
236 strscpy(audio->name, "Radio", sizeof(audio->name));
237 audio->capability = V4L2_AUDCAP_STEREO;
238
239 return 0;
240 }
241
fm_v4l2_vidioc_s_audio(struct file * file,void * priv,const struct v4l2_audio * audio)242 static int fm_v4l2_vidioc_s_audio(struct file *file, void *priv,
243 const struct v4l2_audio *audio)
244 {
245 if (audio->index != 0)
246 return -EINVAL;
247
248 return 0;
249 }
250
251 /* Get tuner attributes. If current mode is NOT RX, return error */
fm_v4l2_vidioc_g_tuner(struct file * file,void * priv,struct v4l2_tuner * tuner)252 static int fm_v4l2_vidioc_g_tuner(struct file *file, void *priv,
253 struct v4l2_tuner *tuner)
254 {
255 struct fmdev *fmdev = video_drvdata(file);
256 u32 bottom_freq;
257 u32 top_freq;
258 u16 stereo_mono_mode;
259 u16 rssilvl;
260 int ret;
261
262 if (tuner->index != 0)
263 return -EINVAL;
264
265 if (fmdev->curr_fmmode != FM_MODE_RX)
266 return -EPERM;
267
268 ret = fm_rx_get_band_freq_range(fmdev, &bottom_freq, &top_freq);
269 if (ret != 0)
270 return ret;
271
272 ret = fm_rx_get_stereo_mono(fmdev, &stereo_mono_mode);
273 if (ret != 0)
274 return ret;
275
276 ret = fm_rx_get_rssi_level(fmdev, &rssilvl);
277 if (ret != 0)
278 return ret;
279
280 strscpy(tuner->name, "FM", sizeof(tuner->name));
281 tuner->type = V4L2_TUNER_RADIO;
282 /* Store rangelow and rangehigh freq in unit of 62.5 Hz */
283 tuner->rangelow = bottom_freq * 16;
284 tuner->rangehigh = top_freq * 16;
285 tuner->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO |
286 ((fmdev->rx.rds.flag == FM_RDS_ENABLE) ? V4L2_TUNER_SUB_RDS : 0);
287 tuner->capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_RDS |
288 V4L2_TUNER_CAP_LOW |
289 V4L2_TUNER_CAP_HWSEEK_BOUNDED |
290 V4L2_TUNER_CAP_HWSEEK_WRAP;
291 tuner->audmode = (stereo_mono_mode ?
292 V4L2_TUNER_MODE_MONO : V4L2_TUNER_MODE_STEREO);
293
294 /*
295 * Actual rssi value lies in between -128 to +127.
296 * Convert this range from 0 to 255 by adding +128
297 */
298 rssilvl += 128;
299
300 /*
301 * Return signal strength value should be within 0 to 65535.
302 * Find out correct signal radio by multiplying (65535/255) = 257
303 */
304 tuner->signal = rssilvl * 257;
305 tuner->afc = 0;
306
307 return ret;
308 }
309
310 /*
311 * Set tuner attributes. If current mode is NOT RX, set to RX.
312 * Currently, we set only audio mode (mono/stereo) and RDS state (on/off).
313 * Should we set other tuner attributes, too?
314 */
fm_v4l2_vidioc_s_tuner(struct file * file,void * priv,const struct v4l2_tuner * tuner)315 static int fm_v4l2_vidioc_s_tuner(struct file *file, void *priv,
316 const struct v4l2_tuner *tuner)
317 {
318 struct fmdev *fmdev = video_drvdata(file);
319 u16 aud_mode;
320 u8 rds_mode;
321 int ret;
322
323 if (tuner->index != 0)
324 return -EINVAL;
325
326 aud_mode = (tuner->audmode == V4L2_TUNER_MODE_STEREO) ?
327 FM_STEREO_MODE : FM_MONO_MODE;
328 rds_mode = (tuner->rxsubchans & V4L2_TUNER_SUB_RDS) ?
329 FM_RDS_ENABLE : FM_RDS_DISABLE;
330
331 if (fmdev->curr_fmmode != FM_MODE_RX) {
332 ret = fmc_set_mode(fmdev, FM_MODE_RX);
333 if (ret < 0) {
334 fmerr("Failed to set RX mode\n");
335 return ret;
336 }
337 }
338
339 ret = fmc_set_stereo_mono(fmdev, aud_mode);
340 if (ret < 0) {
341 fmerr("Failed to set RX stereo/mono mode\n");
342 return ret;
343 }
344
345 ret = fmc_set_rds_mode(fmdev, rds_mode);
346 if (ret < 0)
347 fmerr("Failed to set RX RDS mode\n");
348
349 return ret;
350 }
351
352 /* Get tuner or modulator radio frequency */
fm_v4l2_vidioc_g_freq(struct file * file,void * priv,struct v4l2_frequency * freq)353 static int fm_v4l2_vidioc_g_freq(struct file *file, void *priv,
354 struct v4l2_frequency *freq)
355 {
356 struct fmdev *fmdev = video_drvdata(file);
357 int ret;
358
359 ret = fmc_get_freq(fmdev, &freq->frequency);
360 if (ret < 0) {
361 fmerr("Failed to get frequency\n");
362 return ret;
363 }
364
365 /* Frequency unit of 62.5 Hz*/
366 freq->frequency = (u32) freq->frequency * 16;
367
368 return 0;
369 }
370
371 /* Set tuner or modulator radio frequency */
fm_v4l2_vidioc_s_freq(struct file * file,void * priv,const struct v4l2_frequency * freq)372 static int fm_v4l2_vidioc_s_freq(struct file *file, void *priv,
373 const struct v4l2_frequency *freq)
374 {
375 struct fmdev *fmdev = video_drvdata(file);
376
377 /*
378 * As V4L2_TUNER_CAP_LOW is set 1 user sends the frequency
379 * in units of 62.5 Hz.
380 */
381 return fmc_set_freq(fmdev, freq->frequency / 16);
382 }
383
384 /* Set hardware frequency seek. If current mode is NOT RX, set it RX. */
fm_v4l2_vidioc_s_hw_freq_seek(struct file * file,void * priv,const struct v4l2_hw_freq_seek * seek)385 static int fm_v4l2_vidioc_s_hw_freq_seek(struct file *file, void *priv,
386 const struct v4l2_hw_freq_seek *seek)
387 {
388 struct fmdev *fmdev = video_drvdata(file);
389 int ret;
390
391 if (file->f_flags & O_NONBLOCK)
392 return -EWOULDBLOCK;
393
394 if (fmdev->curr_fmmode != FM_MODE_RX) {
395 ret = fmc_set_mode(fmdev, FM_MODE_RX);
396 if (ret != 0) {
397 fmerr("Failed to set RX mode\n");
398 return ret;
399 }
400 }
401
402 ret = fm_rx_seek(fmdev, seek->seek_upward, seek->wrap_around,
403 seek->spacing);
404 if (ret < 0)
405 fmerr("RX seek failed - %d\n", ret);
406
407 return ret;
408 }
409 /* Get modulator attributes. If mode is not TX, return no attributes. */
fm_v4l2_vidioc_g_modulator(struct file * file,void * priv,struct v4l2_modulator * mod)410 static int fm_v4l2_vidioc_g_modulator(struct file *file, void *priv,
411 struct v4l2_modulator *mod)
412 {
413 struct fmdev *fmdev = video_drvdata(file);
414
415 if (mod->index != 0)
416 return -EINVAL;
417
418 if (fmdev->curr_fmmode != FM_MODE_TX)
419 return -EPERM;
420
421 mod->txsubchans = ((fmdev->tx_data.aud_mode == FM_STEREO_MODE) ?
422 V4L2_TUNER_SUB_STEREO : V4L2_TUNER_SUB_MONO) |
423 ((fmdev->tx_data.rds.flag == FM_RDS_ENABLE) ?
424 V4L2_TUNER_SUB_RDS : 0);
425
426 mod->capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_RDS |
427 V4L2_TUNER_CAP_LOW;
428
429 return 0;
430 }
431
432 /* Set modulator attributes. If mode is not TX, set to TX. */
fm_v4l2_vidioc_s_modulator(struct file * file,void * priv,const struct v4l2_modulator * mod)433 static int fm_v4l2_vidioc_s_modulator(struct file *file, void *priv,
434 const struct v4l2_modulator *mod)
435 {
436 struct fmdev *fmdev = video_drvdata(file);
437 u8 rds_mode;
438 u16 aud_mode;
439 int ret;
440
441 if (mod->index != 0)
442 return -EINVAL;
443
444 if (fmdev->curr_fmmode != FM_MODE_TX) {
445 ret = fmc_set_mode(fmdev, FM_MODE_TX);
446 if (ret != 0) {
447 fmerr("Failed to set TX mode\n");
448 return ret;
449 }
450 }
451
452 aud_mode = (mod->txsubchans & V4L2_TUNER_SUB_STEREO) ?
453 FM_STEREO_MODE : FM_MONO_MODE;
454 rds_mode = (mod->txsubchans & V4L2_TUNER_SUB_RDS) ?
455 FM_RDS_ENABLE : FM_RDS_DISABLE;
456 ret = fm_tx_set_stereo_mono(fmdev, aud_mode);
457 if (ret < 0) {
458 fmerr("Failed to set mono/stereo mode for TX\n");
459 return ret;
460 }
461 ret = fm_tx_set_rds_mode(fmdev, rds_mode);
462 if (ret < 0)
463 fmerr("Failed to set rds mode for TX\n");
464
465 return ret;
466 }
467
468 static const struct v4l2_file_operations fm_drv_fops = {
469 .owner = THIS_MODULE,
470 .read = fm_v4l2_fops_read,
471 .write = fm_v4l2_fops_write,
472 .poll = fm_v4l2_fops_poll,
473 .unlocked_ioctl = video_ioctl2,
474 .open = fm_v4l2_fops_open,
475 .release = fm_v4l2_fops_release,
476 };
477
478 static const struct v4l2_ctrl_ops fm_ctrl_ops = {
479 .s_ctrl = fm_v4l2_s_ctrl,
480 .g_volatile_ctrl = fm_g_volatile_ctrl,
481 };
482 static const struct v4l2_ioctl_ops fm_drv_ioctl_ops = {
483 .vidioc_querycap = fm_v4l2_vidioc_querycap,
484 .vidioc_g_audio = fm_v4l2_vidioc_g_audio,
485 .vidioc_s_audio = fm_v4l2_vidioc_s_audio,
486 .vidioc_g_tuner = fm_v4l2_vidioc_g_tuner,
487 .vidioc_s_tuner = fm_v4l2_vidioc_s_tuner,
488 .vidioc_g_frequency = fm_v4l2_vidioc_g_freq,
489 .vidioc_s_frequency = fm_v4l2_vidioc_s_freq,
490 .vidioc_s_hw_freq_seek = fm_v4l2_vidioc_s_hw_freq_seek,
491 .vidioc_g_modulator = fm_v4l2_vidioc_g_modulator,
492 .vidioc_s_modulator = fm_v4l2_vidioc_s_modulator
493 };
494
495 /* V4L2 RADIO device parent structure */
496 static const struct video_device fm_viddev_template = {
497 .fops = &fm_drv_fops,
498 .ioctl_ops = &fm_drv_ioctl_ops,
499 .name = FM_DRV_NAME,
500 .release = video_device_release_empty,
501 /*
502 * To ensure both the tuner and modulator ioctls are accessible we
503 * set the vfl_dir to M2M to indicate this.
504 *
505 * It is not really a mem2mem device of course, but it can both receive
506 * and transmit using the same radio device. It's the only radio driver
507 * that does this and it should really be split in two radio devices,
508 * but that would affect applications using this driver.
509 */
510 .vfl_dir = VFL_DIR_M2M,
511 .device_caps = V4L2_CAP_HW_FREQ_SEEK | V4L2_CAP_TUNER | V4L2_CAP_RADIO |
512 V4L2_CAP_MODULATOR | V4L2_CAP_AUDIO |
513 V4L2_CAP_READWRITE | V4L2_CAP_RDS_CAPTURE,
514 };
515
fm_v4l2_init_video_device(struct fmdev * fmdev,int radio_nr)516 int fm_v4l2_init_video_device(struct fmdev *fmdev, int radio_nr)
517 {
518 struct v4l2_ctrl *ctrl;
519 int ret;
520
521 strscpy(fmdev->v4l2_dev.name, FM_DRV_NAME,
522 sizeof(fmdev->v4l2_dev.name));
523 ret = v4l2_device_register(NULL, &fmdev->v4l2_dev);
524 if (ret < 0)
525 return ret;
526
527 /* Init mutex for core locking */
528 mutex_init(&fmdev->mutex);
529
530 /* Setup FM driver's V4L2 properties */
531 gradio_dev = fm_viddev_template;
532
533 video_set_drvdata(&gradio_dev, fmdev);
534
535 gradio_dev.lock = &fmdev->mutex;
536 gradio_dev.v4l2_dev = &fmdev->v4l2_dev;
537
538 /* Register with V4L2 subsystem as RADIO device */
539 if (video_register_device(&gradio_dev, VFL_TYPE_RADIO, radio_nr)) {
540 v4l2_device_unregister(&fmdev->v4l2_dev);
541 fmerr("Could not register video device\n");
542 return -ENOMEM;
543 }
544
545 fmdev->radio_dev = &gradio_dev;
546
547 /* Register to v4l2 ctrl handler framework */
548 fmdev->radio_dev->ctrl_handler = &fmdev->ctrl_handler;
549
550 ret = v4l2_ctrl_handler_init(&fmdev->ctrl_handler, 5);
551 if (ret < 0) {
552 fmerr("(fmdev): Can't init ctrl handler\n");
553 v4l2_ctrl_handler_free(&fmdev->ctrl_handler);
554 video_unregister_device(fmdev->radio_dev);
555 v4l2_device_unregister(&fmdev->v4l2_dev);
556 return -EBUSY;
557 }
558
559 /*
560 * Following controls are handled by V4L2 control framework.
561 * Added in ascending ID order.
562 */
563 v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops,
564 V4L2_CID_AUDIO_VOLUME, FM_RX_VOLUME_MIN,
565 FM_RX_VOLUME_MAX, 1, FM_RX_VOLUME_MAX);
566
567 v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops,
568 V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
569
570 v4l2_ctrl_new_std_menu(&fmdev->ctrl_handler, &fm_ctrl_ops,
571 V4L2_CID_TUNE_PREEMPHASIS, V4L2_PREEMPHASIS_75_uS,
572 0, V4L2_PREEMPHASIS_75_uS);
573
574 v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops,
575 V4L2_CID_TUNE_POWER_LEVEL, FM_PWR_LVL_LOW,
576 FM_PWR_LVL_HIGH, 1, FM_PWR_LVL_HIGH);
577
578 ctrl = v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops,
579 V4L2_CID_TUNE_ANTENNA_CAPACITOR, 0,
580 255, 1, 255);
581
582 if (ctrl)
583 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
584
585 return 0;
586 }
587
fm_v4l2_deinit_video_device(void)588 void *fm_v4l2_deinit_video_device(void)
589 {
590 struct fmdev *fmdev;
591
592
593 fmdev = video_get_drvdata(&gradio_dev);
594
595 /* Unregister to v4l2 ctrl handler framework*/
596 v4l2_ctrl_handler_free(&fmdev->ctrl_handler);
597
598 /* Unregister RADIO device from V4L2 subsystem */
599 video_unregister_device(&gradio_dev);
600
601 v4l2_device_unregister(&fmdev->v4l2_dev);
602
603 return fmdev;
604 }
605