1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *   ALSA driver for TEA5757/5759 Philips AM/FM radio tuner chips
4  *
5  *	Copyright (c) 2004 Jaroslav Kysela <perex@perex.cz>
6  */
7 
8 #include <linux/delay.h>
9 #include <linux/module.h>
10 #include <linux/init.h>
11 #include <linux/slab.h>
12 #include <linux/sched.h>
13 #include <asm/io.h>
14 #include <media/v4l2-device.h>
15 #include <media/v4l2-dev.h>
16 #include <media/v4l2-fh.h>
17 #include <media/v4l2-ioctl.h>
18 #include <media/v4l2-event.h>
19 #include <media/drv-intf/tea575x.h>
20 
21 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
22 MODULE_DESCRIPTION("Routines for control of TEA5757/5759 Philips AM/FM radio tuner chips");
23 MODULE_LICENSE("GPL");
24 
25 /*
26  * definitions
27  */
28 
29 #define TEA575X_BIT_SEARCH	(1<<24)		/* 1 = search action, 0 = tuned */
30 #define TEA575X_BIT_UPDOWN	(1<<23)		/* 0 = search down, 1 = search up */
31 #define TEA575X_BIT_MONO	(1<<22)		/* 0 = stereo, 1 = mono */
32 #define TEA575X_BIT_BAND_MASK	(3<<20)
33 #define TEA575X_BIT_BAND_FM	(0<<20)
34 #define TEA575X_BIT_BAND_MW	(1<<20)
35 #define TEA575X_BIT_BAND_LW	(2<<20)
36 #define TEA575X_BIT_BAND_SW	(3<<20)
37 #define TEA575X_BIT_PORT_0	(1<<19)		/* user bit */
38 #define TEA575X_BIT_PORT_1	(1<<18)		/* user bit */
39 #define TEA575X_BIT_SEARCH_MASK	(3<<16)		/* search level */
40 #define TEA575X_BIT_SEARCH_5_28	     (0<<16)	/* FM >5uV, AM >28uV */
41 #define TEA575X_BIT_SEARCH_10_40     (1<<16)	/* FM >10uV, AM > 40uV */
42 #define TEA575X_BIT_SEARCH_30_63     (2<<16)	/* FM >30uV, AM > 63uV */
43 #define TEA575X_BIT_SEARCH_150_1000  (3<<16)	/* FM > 150uV, AM > 1000uV */
44 #define TEA575X_BIT_DUMMY	(1<<15)		/* buffer */
45 #define TEA575X_BIT_FREQ_MASK	0x7fff
46 
47 enum { BAND_FM, BAND_FM_JAPAN, BAND_AM };
48 
49 static const struct v4l2_frequency_band bands[] = {
50 	{
51 		.type = V4L2_TUNER_RADIO,
52 		.index = 0,
53 		.capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
54 			      V4L2_TUNER_CAP_FREQ_BANDS,
55 		.rangelow   =  87500 * 16,
56 		.rangehigh  = 108000 * 16,
57 		.modulation = V4L2_BAND_MODULATION_FM,
58 	},
59 	{
60 		.type = V4L2_TUNER_RADIO,
61 		.index = 0,
62 		.capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
63 			      V4L2_TUNER_CAP_FREQ_BANDS,
64 		.rangelow   = 76000 * 16,
65 		.rangehigh  = 91000 * 16,
66 		.modulation = V4L2_BAND_MODULATION_FM,
67 	},
68 	{
69 		.type = V4L2_TUNER_RADIO,
70 		.index = 1,
71 		.capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_FREQ_BANDS,
72 		.rangelow   =  530 * 16,
73 		.rangehigh  = 1710 * 16,
74 		.modulation = V4L2_BAND_MODULATION_AM,
75 	},
76 };
77 
78 /*
79  * lowlevel part
80  */
81 
snd_tea575x_write(struct snd_tea575x * tea,unsigned int val)82 static void snd_tea575x_write(struct snd_tea575x *tea, unsigned int val)
83 {
84 	u16 l;
85 	u8 data;
86 
87 	if (tea->ops->write_val)
88 		return tea->ops->write_val(tea, val);
89 
90 	tea->ops->set_direction(tea, 1);
91 	udelay(16);
92 
93 	for (l = 25; l > 0; l--) {
94 		data = (val >> 24) & TEA575X_DATA;
95 		val <<= 1;			/* shift data */
96 		tea->ops->set_pins(tea, data | TEA575X_WREN);
97 		udelay(2);
98 		tea->ops->set_pins(tea, data | TEA575X_WREN | TEA575X_CLK);
99 		udelay(2);
100 		tea->ops->set_pins(tea, data | TEA575X_WREN);
101 		udelay(2);
102 	}
103 
104 	if (!tea->mute)
105 		tea->ops->set_pins(tea, 0);
106 }
107 
snd_tea575x_read(struct snd_tea575x * tea)108 static u32 snd_tea575x_read(struct snd_tea575x *tea)
109 {
110 	u16 l, rdata;
111 	u32 data = 0;
112 
113 	if (tea->ops->read_val)
114 		return tea->ops->read_val(tea);
115 
116 	tea->ops->set_direction(tea, 0);
117 	tea->ops->set_pins(tea, 0);
118 	udelay(16);
119 
120 	for (l = 24; l--;) {
121 		tea->ops->set_pins(tea, TEA575X_CLK);
122 		udelay(2);
123 		if (!l)
124 			tea->tuned = tea->ops->get_pins(tea) & TEA575X_MOST ? 0 : 1;
125 		tea->ops->set_pins(tea, 0);
126 		udelay(2);
127 		data <<= 1;			/* shift data */
128 		rdata = tea->ops->get_pins(tea);
129 		if (!l)
130 			tea->stereo = (rdata & TEA575X_MOST) ?  0 : 1;
131 		if (rdata & TEA575X_DATA)
132 			data++;
133 		udelay(2);
134 	}
135 
136 	if (tea->mute)
137 		tea->ops->set_pins(tea, TEA575X_WREN);
138 
139 	return data;
140 }
141 
snd_tea575x_val_to_freq(struct snd_tea575x * tea,u32 val)142 static u32 snd_tea575x_val_to_freq(struct snd_tea575x *tea, u32 val)
143 {
144 	u32 freq = val & TEA575X_BIT_FREQ_MASK;
145 
146 	if (freq == 0)
147 		return freq;
148 
149 	switch (tea->band) {
150 	case BAND_FM:
151 		/* freq *= 12.5 */
152 		freq *= 125;
153 		freq /= 10;
154 		/* crystal fixup */
155 		freq -= TEA575X_FMIF;
156 		break;
157 	case BAND_FM_JAPAN:
158 		/* freq *= 12.5 */
159 		freq *= 125;
160 		freq /= 10;
161 		/* crystal fixup */
162 		freq += TEA575X_FMIF;
163 		break;
164 	case BAND_AM:
165 		/* crystal fixup */
166 		freq -= TEA575X_AMIF;
167 		break;
168 	}
169 
170 	return clamp(freq * 16, bands[tea->band].rangelow,
171 				bands[tea->band].rangehigh); /* from kHz */
172 }
173 
snd_tea575x_get_freq(struct snd_tea575x * tea)174 static u32 snd_tea575x_get_freq(struct snd_tea575x *tea)
175 {
176 	return snd_tea575x_val_to_freq(tea, snd_tea575x_read(tea));
177 }
178 
snd_tea575x_set_freq(struct snd_tea575x * tea)179 void snd_tea575x_set_freq(struct snd_tea575x *tea)
180 {
181 	u32 freq = tea->freq / 16;	/* to kHz */
182 	u32 band = 0;
183 
184 	switch (tea->band) {
185 	case BAND_FM:
186 		band = TEA575X_BIT_BAND_FM;
187 		/* crystal fixup */
188 		freq += TEA575X_FMIF;
189 		/* freq /= 12.5 */
190 		freq *= 10;
191 		freq /= 125;
192 		break;
193 	case BAND_FM_JAPAN:
194 		band = TEA575X_BIT_BAND_FM;
195 		/* crystal fixup */
196 		freq -= TEA575X_FMIF;
197 		/* freq /= 12.5 */
198 		freq *= 10;
199 		freq /= 125;
200 		break;
201 	case BAND_AM:
202 		band = TEA575X_BIT_BAND_MW;
203 		/* crystal fixup */
204 		freq += TEA575X_AMIF;
205 		break;
206 	}
207 
208 	tea->val &= ~(TEA575X_BIT_FREQ_MASK | TEA575X_BIT_BAND_MASK);
209 	tea->val |= band;
210 	tea->val |= freq & TEA575X_BIT_FREQ_MASK;
211 	snd_tea575x_write(tea, tea->val);
212 	tea->freq = snd_tea575x_val_to_freq(tea, tea->val);
213 }
214 EXPORT_SYMBOL(snd_tea575x_set_freq);
215 
216 /*
217  * Linux Video interface
218  */
219 
vidioc_querycap(struct file * file,void * priv,struct v4l2_capability * v)220 static int vidioc_querycap(struct file *file, void  *priv,
221 					struct v4l2_capability *v)
222 {
223 	struct snd_tea575x *tea = video_drvdata(file);
224 
225 	strscpy(v->driver, tea->v4l2_dev->name, sizeof(v->driver));
226 	strscpy(v->card, tea->card, sizeof(v->card));
227 	strlcat(v->card, tea->tea5759 ? " TEA5759" : " TEA5757", sizeof(v->card));
228 	strscpy(v->bus_info, tea->bus_info, sizeof(v->bus_info));
229 	return 0;
230 }
231 
snd_tea575x_enum_freq_bands(struct snd_tea575x * tea,struct v4l2_frequency_band * band)232 int snd_tea575x_enum_freq_bands(struct snd_tea575x *tea,
233 					struct v4l2_frequency_band *band)
234 {
235 	int index;
236 
237 	if (band->tuner != 0)
238 		return -EINVAL;
239 
240 	switch (band->index) {
241 	case 0:
242 		if (tea->tea5759)
243 			index = BAND_FM_JAPAN;
244 		else
245 			index = BAND_FM;
246 		break;
247 	case 1:
248 		if (tea->has_am) {
249 			index = BAND_AM;
250 			break;
251 		}
252 		fallthrough;
253 	default:
254 		return -EINVAL;
255 	}
256 
257 	*band = bands[index];
258 	if (!tea->cannot_read_data)
259 		band->capability |= V4L2_TUNER_CAP_HWSEEK_BOUNDED;
260 
261 	return 0;
262 }
263 EXPORT_SYMBOL(snd_tea575x_enum_freq_bands);
264 
vidioc_enum_freq_bands(struct file * file,void * priv,struct v4l2_frequency_band * band)265 static int vidioc_enum_freq_bands(struct file *file, void *priv,
266 					 struct v4l2_frequency_band *band)
267 {
268 	struct snd_tea575x *tea = video_drvdata(file);
269 
270 	return snd_tea575x_enum_freq_bands(tea, band);
271 }
272 
snd_tea575x_g_tuner(struct snd_tea575x * tea,struct v4l2_tuner * v)273 int snd_tea575x_g_tuner(struct snd_tea575x *tea, struct v4l2_tuner *v)
274 {
275 	struct v4l2_frequency_band band_fm = { 0, };
276 
277 	if (v->index > 0)
278 		return -EINVAL;
279 
280 	snd_tea575x_read(tea);
281 	snd_tea575x_enum_freq_bands(tea, &band_fm);
282 
283 	memset(v, 0, sizeof(*v));
284 	strscpy(v->name, tea->has_am ? "FM/AM" : "FM", sizeof(v->name));
285 	v->type = V4L2_TUNER_RADIO;
286 	v->capability = band_fm.capability;
287 	v->rangelow = tea->has_am ? bands[BAND_AM].rangelow : band_fm.rangelow;
288 	v->rangehigh = band_fm.rangehigh;
289 	v->rxsubchans = tea->stereo ? V4L2_TUNER_SUB_STEREO : V4L2_TUNER_SUB_MONO;
290 	v->audmode = (tea->val & TEA575X_BIT_MONO) ?
291 		V4L2_TUNER_MODE_MONO : V4L2_TUNER_MODE_STEREO;
292 	v->signal = tea->tuned ? 0xffff : 0;
293 	return 0;
294 }
295 EXPORT_SYMBOL(snd_tea575x_g_tuner);
296 
vidioc_g_tuner(struct file * file,void * priv,struct v4l2_tuner * v)297 static int vidioc_g_tuner(struct file *file, void *priv,
298 					struct v4l2_tuner *v)
299 {
300 	struct snd_tea575x *tea = video_drvdata(file);
301 
302 	return snd_tea575x_g_tuner(tea, v);
303 }
304 
vidioc_s_tuner(struct file * file,void * priv,const struct v4l2_tuner * v)305 static int vidioc_s_tuner(struct file *file, void *priv,
306 					const struct v4l2_tuner *v)
307 {
308 	struct snd_tea575x *tea = video_drvdata(file);
309 	u32 orig_val = tea->val;
310 
311 	if (v->index)
312 		return -EINVAL;
313 	tea->val &= ~TEA575X_BIT_MONO;
314 	if (v->audmode == V4L2_TUNER_MODE_MONO)
315 		tea->val |= TEA575X_BIT_MONO;
316 	/* Only apply changes if currently tuning FM */
317 	if (tea->band != BAND_AM && tea->val != orig_val)
318 		snd_tea575x_set_freq(tea);
319 
320 	return 0;
321 }
322 
vidioc_g_frequency(struct file * file,void * priv,struct v4l2_frequency * f)323 static int vidioc_g_frequency(struct file *file, void *priv,
324 					struct v4l2_frequency *f)
325 {
326 	struct snd_tea575x *tea = video_drvdata(file);
327 
328 	if (f->tuner != 0)
329 		return -EINVAL;
330 	f->type = V4L2_TUNER_RADIO;
331 	f->frequency = tea->freq;
332 	return 0;
333 }
334 
vidioc_s_frequency(struct file * file,void * priv,const struct v4l2_frequency * f)335 static int vidioc_s_frequency(struct file *file, void *priv,
336 					const struct v4l2_frequency *f)
337 {
338 	struct snd_tea575x *tea = video_drvdata(file);
339 
340 	if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
341 		return -EINVAL;
342 
343 	if (tea->has_am && f->frequency < (20000 * 16))
344 		tea->band = BAND_AM;
345 	else if (tea->tea5759)
346 		tea->band = BAND_FM_JAPAN;
347 	else
348 		tea->band = BAND_FM;
349 
350 	tea->freq = clamp_t(u32, f->frequency, bands[tea->band].rangelow,
351 					bands[tea->band].rangehigh);
352 	snd_tea575x_set_freq(tea);
353 	return 0;
354 }
355 
snd_tea575x_s_hw_freq_seek(struct file * file,struct snd_tea575x * tea,const struct v4l2_hw_freq_seek * a)356 int snd_tea575x_s_hw_freq_seek(struct file *file, struct snd_tea575x *tea,
357 				const struct v4l2_hw_freq_seek *a)
358 {
359 	unsigned long timeout;
360 	int i, spacing;
361 
362 	if (tea->cannot_read_data)
363 		return -ENOTTY;
364 	if (a->tuner || a->wrap_around)
365 		return -EINVAL;
366 
367 	if (file->f_flags & O_NONBLOCK)
368 		return -EWOULDBLOCK;
369 
370 	if (a->rangelow || a->rangehigh) {
371 		for (i = 0; i < ARRAY_SIZE(bands); i++) {
372 			if ((i == BAND_FM && tea->tea5759) ||
373 			    (i == BAND_FM_JAPAN && !tea->tea5759) ||
374 			    (i == BAND_AM && !tea->has_am))
375 				continue;
376 			if (bands[i].rangelow  == a->rangelow &&
377 			    bands[i].rangehigh == a->rangehigh)
378 				break;
379 		}
380 		if (i == ARRAY_SIZE(bands))
381 			return -EINVAL; /* No matching band found */
382 		if (i != tea->band) {
383 			tea->band = i;
384 			tea->freq = clamp(tea->freq, bands[i].rangelow,
385 						     bands[i].rangehigh);
386 			snd_tea575x_set_freq(tea);
387 		}
388 	}
389 
390 	spacing = (tea->band == BAND_AM) ? 5 : 50; /* kHz */
391 
392 	/* clear the frequency, HW will fill it in */
393 	tea->val &= ~TEA575X_BIT_FREQ_MASK;
394 	tea->val |= TEA575X_BIT_SEARCH;
395 	if (a->seek_upward)
396 		tea->val |= TEA575X_BIT_UPDOWN;
397 	else
398 		tea->val &= ~TEA575X_BIT_UPDOWN;
399 	snd_tea575x_write(tea, tea->val);
400 	timeout = jiffies + msecs_to_jiffies(10000);
401 	for (;;) {
402 		if (time_after(jiffies, timeout))
403 			break;
404 		if (schedule_timeout_interruptible(msecs_to_jiffies(10))) {
405 			/* some signal arrived, stop search */
406 			tea->val &= ~TEA575X_BIT_SEARCH;
407 			snd_tea575x_set_freq(tea);
408 			return -ERESTARTSYS;
409 		}
410 		if (!(snd_tea575x_read(tea) & TEA575X_BIT_SEARCH)) {
411 			u32 freq;
412 
413 			/* Found a frequency, wait until it can be read */
414 			for (i = 0; i < 100; i++) {
415 				msleep(10);
416 				freq = snd_tea575x_get_freq(tea);
417 				if (freq) /* available */
418 					break;
419 			}
420 			if (freq == 0) /* shouldn't happen */
421 				break;
422 			/*
423 			 * if we moved by less than the spacing, or in the
424 			 * wrong direction, continue seeking
425 			 */
426 			if (abs(tea->freq - freq) < 16 * spacing ||
427 					(a->seek_upward && freq < tea->freq) ||
428 					(!a->seek_upward && freq > tea->freq)) {
429 				snd_tea575x_write(tea, tea->val);
430 				continue;
431 			}
432 			tea->freq = freq;
433 			tea->val &= ~TEA575X_BIT_SEARCH;
434 			return 0;
435 		}
436 	}
437 	tea->val &= ~TEA575X_BIT_SEARCH;
438 	snd_tea575x_set_freq(tea);
439 	return -ENODATA;
440 }
441 EXPORT_SYMBOL(snd_tea575x_s_hw_freq_seek);
442 
vidioc_s_hw_freq_seek(struct file * file,void * fh,const struct v4l2_hw_freq_seek * a)443 static int vidioc_s_hw_freq_seek(struct file *file, void *fh,
444 					const struct v4l2_hw_freq_seek *a)
445 {
446 	struct snd_tea575x *tea = video_drvdata(file);
447 
448 	return snd_tea575x_s_hw_freq_seek(file, tea, a);
449 }
450 
tea575x_s_ctrl(struct v4l2_ctrl * ctrl)451 static int tea575x_s_ctrl(struct v4l2_ctrl *ctrl)
452 {
453 	struct snd_tea575x *tea = container_of(ctrl->handler, struct snd_tea575x, ctrl_handler);
454 
455 	switch (ctrl->id) {
456 	case V4L2_CID_AUDIO_MUTE:
457 		tea->mute = ctrl->val;
458 		snd_tea575x_set_freq(tea);
459 		return 0;
460 	}
461 
462 	return -EINVAL;
463 }
464 
465 static const struct v4l2_file_operations tea575x_fops = {
466 	.unlocked_ioctl	= video_ioctl2,
467 	.open           = v4l2_fh_open,
468 	.release        = v4l2_fh_release,
469 	.poll           = v4l2_ctrl_poll,
470 };
471 
472 static const struct v4l2_ioctl_ops tea575x_ioctl_ops = {
473 	.vidioc_querycap    = vidioc_querycap,
474 	.vidioc_g_tuner     = vidioc_g_tuner,
475 	.vidioc_s_tuner     = vidioc_s_tuner,
476 	.vidioc_g_frequency = vidioc_g_frequency,
477 	.vidioc_s_frequency = vidioc_s_frequency,
478 	.vidioc_s_hw_freq_seek = vidioc_s_hw_freq_seek,
479 	.vidioc_enum_freq_bands = vidioc_enum_freq_bands,
480 	.vidioc_log_status  = v4l2_ctrl_log_status,
481 	.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
482 	.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
483 };
484 
485 static const struct video_device tea575x_radio = {
486 	.ioctl_ops	= &tea575x_ioctl_ops,
487 	.release        = video_device_release_empty,
488 };
489 
490 static const struct v4l2_ctrl_ops tea575x_ctrl_ops = {
491 	.s_ctrl = tea575x_s_ctrl,
492 };
493 
494 
snd_tea575x_hw_init(struct snd_tea575x * tea)495 int snd_tea575x_hw_init(struct snd_tea575x *tea)
496 {
497 	tea->mute = true;
498 
499 	/* Not all devices can or know how to read the data back.
500 	   Such devices can set cannot_read_data to true. */
501 	if (!tea->cannot_read_data) {
502 		snd_tea575x_write(tea, 0x55AA);
503 		if (snd_tea575x_read(tea) != 0x55AA)
504 			return -ENODEV;
505 	}
506 
507 	tea->val = TEA575X_BIT_BAND_FM | TEA575X_BIT_SEARCH_5_28;
508 	tea->freq = 90500 * 16;		/* 90.5Mhz default */
509 	snd_tea575x_set_freq(tea);
510 
511 	return 0;
512 }
513 EXPORT_SYMBOL(snd_tea575x_hw_init);
514 
snd_tea575x_init(struct snd_tea575x * tea,struct module * owner)515 int snd_tea575x_init(struct snd_tea575x *tea, struct module *owner)
516 {
517 	int retval = snd_tea575x_hw_init(tea);
518 
519 	if (retval)
520 		return retval;
521 
522 	tea->vd = tea575x_radio;
523 	video_set_drvdata(&tea->vd, tea);
524 	mutex_init(&tea->mutex);
525 	strscpy(tea->vd.name, tea->v4l2_dev->name, sizeof(tea->vd.name));
526 	tea->vd.lock = &tea->mutex;
527 	tea->vd.v4l2_dev = tea->v4l2_dev;
528 	tea->vd.device_caps = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
529 	if (!tea->cannot_read_data)
530 		tea->vd.device_caps |= V4L2_CAP_HW_FREQ_SEEK;
531 	tea->fops = tea575x_fops;
532 	tea->fops.owner = owner;
533 	tea->vd.fops = &tea->fops;
534 	/* disable hw_freq_seek if we can't use it */
535 	if (tea->cannot_read_data)
536 		v4l2_disable_ioctl(&tea->vd, VIDIOC_S_HW_FREQ_SEEK);
537 
538 	if (!tea->cannot_mute) {
539 		tea->vd.ctrl_handler = &tea->ctrl_handler;
540 		v4l2_ctrl_handler_init(&tea->ctrl_handler, 1);
541 		v4l2_ctrl_new_std(&tea->ctrl_handler, &tea575x_ctrl_ops,
542 				  V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
543 		retval = tea->ctrl_handler.error;
544 		if (retval) {
545 			v4l2_err(tea->v4l2_dev, "can't initialize controls\n");
546 			v4l2_ctrl_handler_free(&tea->ctrl_handler);
547 			return retval;
548 		}
549 
550 		if (tea->ext_init) {
551 			retval = tea->ext_init(tea);
552 			if (retval) {
553 				v4l2_ctrl_handler_free(&tea->ctrl_handler);
554 				return retval;
555 			}
556 		}
557 
558 		v4l2_ctrl_handler_setup(&tea->ctrl_handler);
559 	}
560 
561 	retval = video_register_device(&tea->vd, VFL_TYPE_RADIO, tea->radio_nr);
562 	if (retval) {
563 		v4l2_err(tea->v4l2_dev, "can't register video device!\n");
564 		v4l2_ctrl_handler_free(tea->vd.ctrl_handler);
565 		return retval;
566 	}
567 
568 	return 0;
569 }
570 EXPORT_SYMBOL(snd_tea575x_init);
571 
snd_tea575x_exit(struct snd_tea575x * tea)572 void snd_tea575x_exit(struct snd_tea575x *tea)
573 {
574 	video_unregister_device(&tea->vd);
575 	v4l2_ctrl_handler_free(tea->vd.ctrl_handler);
576 }
577 EXPORT_SYMBOL(snd_tea575x_exit);
578