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TOMOYO Linux Cross Reference
Linux/sound/firewire/bebob/bebob.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  * bebob.c - a part of driver for BeBoB based devices
  4  *
  5  * Copyright (c) 2013-2014 Takashi Sakamoto
  6  */
  7 
  8 /*
  9  * BeBoB is 'BridgeCo enhanced Breakout Box'. This is installed to firewire
 10  * devices with DM1000/DM1100/DM1500 chipset. It gives common way for host
 11  * system to handle BeBoB based devices.
 12  */
 13 
 14 #include "bebob.h"
 15 
 16 MODULE_DESCRIPTION("BridgeCo BeBoB driver");
 17 MODULE_AUTHOR("Takashi Sakamoto <o-takashi@sakamocchi.jp>");
 18 MODULE_LICENSE("GPL v2");
 19 
 20 static int index[SNDRV_CARDS]   = SNDRV_DEFAULT_IDX;
 21 static char *id[SNDRV_CARDS]    = SNDRV_DEFAULT_STR;
 22 static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;
 23 
 24 module_param_array(index, int, NULL, 0444);
 25 MODULE_PARM_DESC(index, "card index");
 26 module_param_array(id, charp, NULL, 0444);
 27 MODULE_PARM_DESC(id, "ID string");
 28 module_param_array(enable, bool, NULL, 0444);
 29 MODULE_PARM_DESC(enable, "enable BeBoB sound card");
 30 
 31 static DEFINE_MUTEX(devices_mutex);
 32 static DECLARE_BITMAP(devices_used, SNDRV_CARDS);
 33 
 34 /* Offsets from information register. */
 35 #define INFO_OFFSET_BEBOB_VERSION       0x08
 36 #define INFO_OFFSET_GUID                0x10
 37 #define INFO_OFFSET_HW_MODEL_ID         0x18
 38 #define INFO_OFFSET_HW_MODEL_REVISION   0x1c
 39 
 40 #define VEN_EDIROL      0x000040ab
 41 #define VEN_PRESONUS    0x00000a92
 42 #define VEN_BRIDGECO    0x000007f5
 43 #define VEN_MACKIE      0x00000ff2
 44 #define VEN_STANTON     0x00001260
 45 #define VEN_TASCAM      0x0000022e
 46 #define VEN_BEHRINGER   0x00001564
 47 #define VEN_APOGEE      0x000003db
 48 #define VEN_ESI         0x00000f1b
 49 #define VEN_CME         0x0000000a
 50 #define VEN_PHONIC      0x00001496
 51 #define VEN_LYNX        0x000019e5
 52 #define VEN_ICON        0x00001a9e
 53 #define VEN_PRISMSOUND  0x00001198
 54 #define VEN_TERRATEC    0x00000aac
 55 #define VEN_YAMAHA      0x0000a0de
 56 #define VEN_FOCUSRITE   0x0000130e
 57 #define VEN_MAUDIO      0x00000d6c
 58 #define VEN_DIGIDESIGN  0x00a07e
 59 #define OUI_SHOUYO      0x002327
 60 
 61 #define MODEL_FOCUSRITE_SAFFIRE_BOTH    0x00000000
 62 #define MODEL_MAUDIO_AUDIOPHILE_BOTH    0x00010060
 63 #define MODEL_MAUDIO_FW1814             0x00010071
 64 #define MODEL_MAUDIO_PROJECTMIX         0x00010091
 65 #define MODEL_MAUDIO_PROFIRELIGHTBRIDGE 0x000100a1
 66 
 67 static int
 68 name_device(struct snd_bebob *bebob)
 69 {
 70         struct fw_device *fw_dev = fw_parent_device(bebob->unit);
 71         char vendor[24] = {0};
 72         char model[32] = {0};
 73         u32 hw_id;
 74         u32 data[2] = {0};
 75         u32 revision;
 76         int err;
 77 
 78         /* get vendor name from root directory */
 79         err = fw_csr_string(fw_dev->config_rom + 5, CSR_VENDOR,
 80                             vendor, sizeof(vendor));
 81         if (err < 0)
 82                 goto end;
 83 
 84         /* get model name from unit directory */
 85         err = fw_csr_string(bebob->unit->directory, CSR_MODEL,
 86                             model, sizeof(model));
 87         if (err < 0)
 88                 goto end;
 89 
 90         /* get hardware id */
 91         err = snd_bebob_read_quad(bebob->unit, INFO_OFFSET_HW_MODEL_ID,
 92                                   &hw_id);
 93         if (err < 0)
 94                 goto end;
 95 
 96         /* get hardware revision */
 97         err = snd_bebob_read_quad(bebob->unit, INFO_OFFSET_HW_MODEL_REVISION,
 98                                   &revision);
 99         if (err < 0)
100                 goto end;
101 
102         /* get GUID */
103         err = snd_bebob_read_block(bebob->unit, INFO_OFFSET_GUID,
104                                    data, sizeof(data));
105         if (err < 0)
106                 goto end;
107 
108         strcpy(bebob->card->driver, "BeBoB");
109         strcpy(bebob->card->shortname, model);
110         strcpy(bebob->card->mixername, model);
111         snprintf(bebob->card->longname, sizeof(bebob->card->longname),
112                  "%s %s (id:%d, rev:%d), GUID %08x%08x at %s, S%d",
113                  vendor, model, hw_id, revision,
114                  data[0], data[1], dev_name(&bebob->unit->device),
115                  100 << fw_dev->max_speed);
116 end:
117         return err;
118 }
119 
120 static void
121 bebob_card_free(struct snd_card *card)
122 {
123         struct snd_bebob *bebob = card->private_data;
124 
125         mutex_lock(&devices_mutex);
126         clear_bit(bebob->card_index, devices_used);
127         mutex_unlock(&devices_mutex);
128 
129         snd_bebob_stream_destroy_duplex(bebob);
130 
131         mutex_destroy(&bebob->mutex);
132         fw_unit_put(bebob->unit);
133 }
134 
135 static const struct snd_bebob_spec *
136 get_saffire_spec(struct fw_unit *unit)
137 {
138         char name[24] = {0};
139 
140         if (fw_csr_string(unit->directory, CSR_MODEL, name, sizeof(name)) < 0)
141                 return NULL;
142 
143         if (strcmp(name, "SaffireLE") == 0)
144                 return &saffire_le_spec;
145         else
146                 return &saffire_spec;
147 }
148 
149 static bool
150 check_audiophile_booted(struct fw_unit *unit)
151 {
152         char name[28] = {0};
153 
154         if (fw_csr_string(unit->directory, CSR_MODEL, name, sizeof(name)) < 0)
155                 return false;
156 
157         return strncmp(name, "FW Audiophile Bootloader", 24) != 0;
158 }
159 
160 static int detect_quirks(struct snd_bebob *bebob, const struct ieee1394_device_id *entry)
161 {
162         if (entry->vendor_id == VEN_MAUDIO) {
163                 switch (entry->model_id) {
164                 case MODEL_MAUDIO_PROFIRELIGHTBRIDGE:
165                         // M-Audio ProFire Lightbridge has a quirk to transfer packets with
166                         // discontinuous cycle or data block counter in early stage of packet
167                         // streaming. The cycle span from the first packet with event is variable.
168                         bebob->quirks |= SND_BEBOB_QUIRK_INITIAL_DISCONTINUOUS_DBC;
169                         break;
170                 case MODEL_MAUDIO_FW1814:
171                 case MODEL_MAUDIO_PROJECTMIX:
172                         // At high sampling rate, M-Audio special firmware transmits empty packet
173                         // with the value of dbc incremented by 8.
174                         bebob->quirks |= SND_BEBOB_QUIRK_WRONG_DBC;
175                         break;
176                 default:
177                         break;
178                 }
179         }
180 
181         return 0;
182 }
183 
184 static int bebob_probe(struct fw_unit *unit, const struct ieee1394_device_id *entry)
185 {
186         unsigned int card_index;
187         struct snd_card *card;
188         struct snd_bebob *bebob;
189         const struct snd_bebob_spec *spec;
190         int err;
191 
192         if (entry->vendor_id == VEN_FOCUSRITE &&
193             entry->model_id == MODEL_FOCUSRITE_SAFFIRE_BOTH)
194                 spec = get_saffire_spec(unit);
195         else if (entry->vendor_id == VEN_MAUDIO &&
196                  entry->model_id == MODEL_MAUDIO_AUDIOPHILE_BOTH &&
197                  !check_audiophile_booted(unit))
198                 spec = NULL;
199         else
200                 spec = (const struct snd_bebob_spec *)entry->driver_data;
201 
202         if (spec == NULL) {
203                 // To boot up M-Audio models.
204                 if (entry->vendor_id == VEN_MAUDIO || entry->vendor_id == VEN_BRIDGECO)
205                         return snd_bebob_maudio_load_firmware(unit);
206                 else
207                         return -ENODEV;
208         }
209 
210         mutex_lock(&devices_mutex);
211         for (card_index = 0; card_index < SNDRV_CARDS; card_index++) {
212                 if (!test_bit(card_index, devices_used) && enable[card_index])
213                         break;
214         }
215         if (card_index >= SNDRV_CARDS) {
216                 mutex_unlock(&devices_mutex);
217                 return -ENOENT;
218         }
219 
220         err = snd_card_new(&unit->device, index[card_index], id[card_index], THIS_MODULE,
221                            sizeof(*bebob), &card);
222         if (err < 0) {
223                 mutex_unlock(&devices_mutex);
224                 return err;
225         }
226         card->private_free = bebob_card_free;
227         set_bit(card_index, devices_used);
228         mutex_unlock(&devices_mutex);
229 
230         bebob = card->private_data;
231         bebob->unit = fw_unit_get(unit);
232         dev_set_drvdata(&unit->device, bebob);
233         bebob->card = card;
234         bebob->card_index = card_index;
235 
236         bebob->spec = spec;
237         mutex_init(&bebob->mutex);
238         spin_lock_init(&bebob->lock);
239         init_waitqueue_head(&bebob->hwdep_wait);
240 
241         err = name_device(bebob);
242         if (err < 0)
243                 goto error;
244 
245         err = detect_quirks(bebob, entry);
246         if (err < 0)
247                 goto error;
248 
249         if (bebob->spec == &maudio_special_spec) {
250                 if (entry->model_id == MODEL_MAUDIO_FW1814)
251                         err = snd_bebob_maudio_special_discover(bebob, true);
252                 else
253                         err = snd_bebob_maudio_special_discover(bebob, false);
254         } else {
255                 err = snd_bebob_stream_discover(bebob);
256         }
257         if (err < 0)
258                 goto error;
259 
260         err = snd_bebob_stream_init_duplex(bebob);
261         if (err < 0)
262                 goto error;
263 
264         snd_bebob_proc_init(bebob);
265 
266         if (bebob->midi_input_ports > 0 || bebob->midi_output_ports > 0) {
267                 err = snd_bebob_create_midi_devices(bebob);
268                 if (err < 0)
269                         goto error;
270         }
271 
272         err = snd_bebob_create_pcm_devices(bebob);
273         if (err < 0)
274                 goto error;
275 
276         err = snd_bebob_create_hwdep_device(bebob);
277         if (err < 0)
278                 goto error;
279 
280         err = snd_card_register(card);
281         if (err < 0)
282                 goto error;
283 
284         if (entry->vendor_id == VEN_MAUDIO &&
285             (entry->model_id == MODEL_MAUDIO_FW1814 || entry->model_id == MODEL_MAUDIO_PROJECTMIX)) {
286                 // This is a workaround. This bus reset seems to have an effect to make devices
287                 // correctly handling transactions. Without this, the devices have gap_count
288                 // mismatch. This causes much failure of transaction.
289                 //
290                 // Just after registration, user-land application receive signals from dbus and
291                 // starts I/Os. To avoid I/Os till the future bus reset, registration is done in
292                 // next update().
293                 fw_schedule_bus_reset(fw_parent_device(bebob->unit)->card, false, true);
294         }
295 
296         return 0;
297 error:
298         snd_card_free(card);
299         return err;
300 }
301 
302 /*
303  * This driver doesn't update streams in bus reset handler.
304  *
305  * DM1000/ DM1100/DM1500 chipsets with BeBoB firmware transfer packets with
306  * discontinued counter at bus reset. This discontinuity is immediately
307  * detected in packet streaming layer, then it sets XRUN to PCM substream.
308  *
309  * ALSA PCM applications can know the XRUN by getting -EPIPE from PCM operation.
310  * Then, they can recover the PCM substream by executing ioctl(2) with
311  * SNDRV_PCM_IOCTL_PREPARE. 'struct snd_pcm_ops.prepare' is called and drivers
312  * restart packet streaming.
313  *
314  * The above processing may be executed before this bus-reset handler is
315  * executed. When this handler updates streams with current isochronous
316  * channels, the streams already have the current ones.
317  */
318 static void
319 bebob_update(struct fw_unit *unit)
320 {
321         struct snd_bebob *bebob = dev_get_drvdata(&unit->device);
322 
323         if (bebob == NULL)
324                 return;
325 
326         fcp_bus_reset(bebob->unit);
327 }
328 
329 static void bebob_remove(struct fw_unit *unit)
330 {
331         struct snd_bebob *bebob = dev_get_drvdata(&unit->device);
332 
333         if (bebob == NULL)
334                 return;
335 
336         // Block till all of ALSA character devices are released.
337         snd_card_free(bebob->card);
338 }
339 
340 static const struct snd_bebob_rate_spec normal_rate_spec = {
341         .get    = &snd_bebob_stream_get_rate,
342         .set    = &snd_bebob_stream_set_rate
343 };
344 static const struct snd_bebob_spec spec_normal = {
345         .clock  = NULL,
346         .rate   = &normal_rate_spec,
347         .meter  = NULL
348 };
349 
350 #define SPECIFIER_1394TA        0x00a02d
351 
352 // The immediate entry for version in unit directory differs depending on models:
353 //  * 0x010001
354 //  * 0x014001
355 #define SND_BEBOB_DEV_ENTRY(vendor, model, data) \
356 { \
357         .match_flags    = IEEE1394_MATCH_VENDOR_ID | \
358                           IEEE1394_MATCH_MODEL_ID | \
359                           IEEE1394_MATCH_SPECIFIER_ID, \
360         .vendor_id      = vendor, \
361         .model_id       = model, \
362         .specifier_id   = SPECIFIER_1394TA, \
363         .driver_data    = (kernel_ulong_t)data \
364 }
365 
366 static const struct ieee1394_device_id bebob_id_table[] = {
367         /* Edirol, FA-66 */
368         SND_BEBOB_DEV_ENTRY(VEN_EDIROL, 0x00010049, &spec_normal),
369         /* Edirol, FA-101 */
370         SND_BEBOB_DEV_ENTRY(VEN_EDIROL, 0x00010048, &spec_normal),
371         /* Presonus, FIREBOX */
372         SND_BEBOB_DEV_ENTRY(VEN_PRESONUS, 0x00010000, &spec_normal),
373         /* PreSonus, FIREPOD/FP10 */
374         SND_BEBOB_DEV_ENTRY(VEN_PRESONUS, 0x00010066, &spec_normal),
375         /* PreSonus, Inspire1394 */
376         SND_BEBOB_DEV_ENTRY(VEN_PRESONUS, 0x00010001, &spec_normal),
377         /* BridgeCo, RDAudio1 */
378         SND_BEBOB_DEV_ENTRY(VEN_BRIDGECO, 0x00010048, &spec_normal),
379         /* BridgeCo, Audio5 */
380         SND_BEBOB_DEV_ENTRY(VEN_BRIDGECO, 0x00010049, &spec_normal),
381         /* Mackie, Onyx 1220/1620/1640 (Firewire I/O Card) */
382         SND_BEBOB_DEV_ENTRY(VEN_MACKIE, 0x00010065, &spec_normal),
383         // Mackie, d.2 (optional Firewire card with DM1000).
384         SND_BEBOB_DEV_ENTRY(VEN_MACKIE, 0x00010067, &spec_normal),
385         /* Stanton, ScratchAmp */
386         SND_BEBOB_DEV_ENTRY(VEN_STANTON, 0x00000001, &spec_normal),
387         /* Tascam, IF-FW DM */
388         SND_BEBOB_DEV_ENTRY(VEN_TASCAM, 0x00010067, &spec_normal),
389         /* Behringer, XENIX UFX 1204 */
390         SND_BEBOB_DEV_ENTRY(VEN_BEHRINGER, 0x00001204, &spec_normal),
391         /* Behringer, XENIX UFX 1604 */
392         SND_BEBOB_DEV_ENTRY(VEN_BEHRINGER, 0x00001604, &spec_normal),
393         /* Behringer, Digital Mixer X32 series (X-UF Card) */
394         SND_BEBOB_DEV_ENTRY(VEN_BEHRINGER, 0x00000006, &spec_normal),
395         /*  Behringer, F-Control Audio 1616 */
396         SND_BEBOB_DEV_ENTRY(VEN_BEHRINGER, 0x001616, &spec_normal),
397         /*  Behringer, F-Control Audio 610 */
398         SND_BEBOB_DEV_ENTRY(VEN_BEHRINGER, 0x000610, &spec_normal),
399         /* Apogee Electronics, Rosetta 200/400 (X-FireWire card) */
400         /* Apogee Electronics, DA/AD/DD-16X (X-FireWire card) */
401         SND_BEBOB_DEV_ENTRY(VEN_APOGEE, 0x00010048, &spec_normal),
402         /* Apogee Electronics, Ensemble */
403         SND_BEBOB_DEV_ENTRY(VEN_APOGEE, 0x01eeee, &spec_normal),
404         /* ESI, Quatafire610 */
405         SND_BEBOB_DEV_ENTRY(VEN_ESI, 0x00010064, &spec_normal),
406         /* CME, MatrixKFW */
407         SND_BEBOB_DEV_ENTRY(VEN_CME, 0x00030000, &spec_normal),
408         // Phonic Helix Board 12 FireWire MkII.
409         SND_BEBOB_DEV_ENTRY(VEN_PHONIC, 0x00050000, &spec_normal),
410         // Phonic Helix Board 18 FireWire MkII.
411         SND_BEBOB_DEV_ENTRY(VEN_PHONIC, 0x00060000, &spec_normal),
412         // Phonic Helix Board 24 FireWire MkII.
413         SND_BEBOB_DEV_ENTRY(VEN_PHONIC, 0x00070000, &spec_normal),
414         // Phonic FireFly 808 FireWire.
415         SND_BEBOB_DEV_ENTRY(VEN_PHONIC, 0x00080000, &spec_normal),
416         // Phonic FireFly 202, 302, 808 Universal.
417         // Phinic Helix Board 12/18/24 FireWire, 12/18/24 Universal
418         SND_BEBOB_DEV_ENTRY(VEN_PHONIC, 0x00000000, &spec_normal),
419         /* Lynx, Aurora 8/16 (LT-FW) */
420         SND_BEBOB_DEV_ENTRY(VEN_LYNX, 0x00000001, &spec_normal),
421         /* ICON, FireXon */
422         SND_BEBOB_DEV_ENTRY(VEN_ICON, 0x00000001, &spec_normal),
423         /* PrismSound, Orpheus */
424         SND_BEBOB_DEV_ENTRY(VEN_PRISMSOUND, 0x00010048, &spec_normal),
425         /* PrismSound, ADA-8XR */
426         SND_BEBOB_DEV_ENTRY(VEN_PRISMSOUND, 0x0000ada8, &spec_normal),
427         /* TerraTec Electronic GmbH, PHASE 88 Rack FW */
428         SND_BEBOB_DEV_ENTRY(VEN_TERRATEC, 0x00000003, &phase88_rack_spec),
429         /* TerraTec Electronic GmbH, PHASE 24 FW */
430         SND_BEBOB_DEV_ENTRY(VEN_TERRATEC, 0x00000004, &yamaha_terratec_spec),
431         /* TerraTec Electronic GmbH, Phase X24 FW */
432         SND_BEBOB_DEV_ENTRY(VEN_TERRATEC, 0x00000007, &yamaha_terratec_spec),
433         /* TerraTec Electronic GmbH, EWS MIC2/MIC8 */
434         SND_BEBOB_DEV_ENTRY(VEN_TERRATEC, 0x00000005, &spec_normal),
435         // Terratec Electronic GmbH, Aureon 7.1 Firewire.
436         // AcousticReality, eAR Master One, Eroica, Figaro, and Ciaccona. Perhaps Terratec OEM.
437         SND_BEBOB_DEV_ENTRY(VEN_TERRATEC, 0x00000002, &spec_normal),
438         /* Yamaha, GO44 */
439         SND_BEBOB_DEV_ENTRY(VEN_YAMAHA, 0x0010000b, &yamaha_terratec_spec),
440         /* YAMAHA, GO46 */
441         SND_BEBOB_DEV_ENTRY(VEN_YAMAHA, 0x0010000c, &yamaha_terratec_spec),
442         /* Focusrite, SaffirePro 26 I/O */
443         SND_BEBOB_DEV_ENTRY(VEN_FOCUSRITE, 0x00000003, &saffirepro_26_spec),
444         /* Focusrite, SaffirePro 10 I/O */
445         SND_BEBOB_DEV_ENTRY(VEN_FOCUSRITE, 0x000006, &saffirepro_10_spec),
446         /* Focusrite, Saffire(no label and LE) */
447         SND_BEBOB_DEV_ENTRY(VEN_FOCUSRITE, MODEL_FOCUSRITE_SAFFIRE_BOTH,
448                             &saffire_spec),
449         // M-Audio, Firewire 410. The vendor field is left as BridgeCo. AG.
450         SND_BEBOB_DEV_ENTRY(VEN_BRIDGECO, 0x00010058, NULL),
451         SND_BEBOB_DEV_ENTRY(VEN_BRIDGECO, 0x00010046, &maudio_fw410_spec),
452         /* M-Audio, Firewire Audiophile */
453         SND_BEBOB_DEV_ENTRY(VEN_MAUDIO, MODEL_MAUDIO_AUDIOPHILE_BOTH,
454                             &maudio_audiophile_spec),
455         /* M-Audio, Firewire Solo */
456         SND_BEBOB_DEV_ENTRY(VEN_MAUDIO, 0x00010062, &maudio_solo_spec),
457         /* M-Audio, Ozonic */
458         SND_BEBOB_DEV_ENTRY(VEN_MAUDIO, 0x0000000a, &maudio_ozonic_spec),
459         /* M-Audio NRV10 */
460         SND_BEBOB_DEV_ENTRY(VEN_MAUDIO, 0x00010081, &maudio_nrv10_spec),
461         /* M-Audio, ProFireLightbridge */
462         SND_BEBOB_DEV_ENTRY(VEN_MAUDIO, MODEL_MAUDIO_PROFIRELIGHTBRIDGE, &spec_normal),
463         /* Firewire 1814 */
464         SND_BEBOB_DEV_ENTRY(VEN_MAUDIO, 0x00010070, NULL),      /* bootloader */
465         SND_BEBOB_DEV_ENTRY(VEN_MAUDIO, MODEL_MAUDIO_FW1814,
466                             &maudio_special_spec),
467         /* M-Audio ProjectMix */
468         SND_BEBOB_DEV_ENTRY(VEN_MAUDIO, MODEL_MAUDIO_PROJECTMIX,
469                             &maudio_special_spec),
470         /* Digidesign Mbox 2 Pro */
471         SND_BEBOB_DEV_ENTRY(VEN_DIGIDESIGN, 0x0000a9, &spec_normal),
472         // Toneweal FW66.
473         SND_BEBOB_DEV_ENTRY(OUI_SHOUYO, 0x020002, &spec_normal),
474         /* IDs are unknown but able to be supported */
475         /*  Apogee, Mini-ME Firewire */
476         /*  Apogee, Mini-DAC Firewire */
477         /*  Cakawalk, Sonar Power Studio 66 */
478         /*  CME, UF400e */
479         /*  ESI, Quotafire XL */
480         /*  Infrasonic, DewX */
481         /*  Infrasonic, Windy6 */
482         /*  Mackie, Digital X Bus x.200 */
483         /*  Mackie, Digital X Bus x.400 */
484         /*  Rolf Spuler, Firewire Guitar */
485         {}
486 };
487 MODULE_DEVICE_TABLE(ieee1394, bebob_id_table);
488 
489 static struct fw_driver bebob_driver = {
490         .driver = {
491                 .owner  = THIS_MODULE,
492                 .name   = KBUILD_MODNAME,
493                 .bus    = &fw_bus_type,
494         },
495         .probe    = bebob_probe,
496         .update   = bebob_update,
497         .remove   = bebob_remove,
498         .id_table = bebob_id_table,
499 };
500 
501 static int __init
502 snd_bebob_init(void)
503 {
504         return driver_register(&bebob_driver.driver);
505 }
506 
507 static void __exit
508 snd_bebob_exit(void)
509 {
510         driver_unregister(&bebob_driver.driver);
511 }
512 
513 module_init(snd_bebob_init);
514 module_exit(snd_bebob_exit);
515 

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