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 | |
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 | |
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 | |
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 | |
174 | static u32 snd_tea575x_get_freq(struct snd_tea575x *tea) |
175 | { |
176 | return snd_tea575x_val_to_freq(tea, val: snd_tea575x_read(tea)); |
177 | } |
178 | |
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, val: tea->val); |
212 | tea->freq = snd_tea575x_val_to_freq(tea, val: tea->val); |
213 | } |
214 | EXPORT_SYMBOL(snd_tea575x_set_freq); |
215 | |
216 | /* |
217 | * Linux Video interface |
218 | */ |
219 | |
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(p: v->card, q: tea->tea5759 ? " TEA5759" : " TEA5757" , avail: sizeof(v->card)); |
228 | strscpy(v->bus_info, tea->bus_info, sizeof(v->bus_info)); |
229 | return 0; |
230 | } |
231 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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, val: tea->val); |
400 | timeout = jiffies + msecs_to_jiffies(m: 10000); |
401 | for (;;) { |
402 | if (time_after(jiffies, timeout)) |
403 | break; |
404 | if (schedule_timeout_interruptible(timeout: msecs_to_jiffies(m: 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(msecs: 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, val: 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 | |
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 | |
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 | |
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, val: 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 | |
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(vdev: &tea->vd, data: 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(vdev: &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(hdl: &tea->ctrl_handler, ops: &tea575x_ctrl_ops, |
542 | V4L2_CID_AUDIO_MUTE, min: 0, max: 1, step: 1, def: 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(hdl: &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(hdl: &tea->ctrl_handler); |
554 | return retval; |
555 | } |
556 | } |
557 | |
558 | v4l2_ctrl_handler_setup(hdl: &tea->ctrl_handler); |
559 | } |
560 | |
561 | retval = video_register_device(vdev: &tea->vd, type: VFL_TYPE_RADIO, nr: tea->radio_nr); |
562 | if (retval) { |
563 | v4l2_err(tea->v4l2_dev, "can't register video device!\n" ); |
564 | v4l2_ctrl_handler_free(hdl: tea->vd.ctrl_handler); |
565 | return retval; |
566 | } |
567 | |
568 | return 0; |
569 | } |
570 | EXPORT_SYMBOL(snd_tea575x_init); |
571 | |
572 | void snd_tea575x_exit(struct snd_tea575x *tea) |
573 | { |
574 | video_unregister_device(vdev: &tea->vd); |
575 | v4l2_ctrl_handler_free(hdl: tea->vd.ctrl_handler); |
576 | } |
577 | EXPORT_SYMBOL(snd_tea575x_exit); |
578 | |