1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Routines for control of the AK4117 via 4-wire serial interface
4 * IEC958 (S/PDIF) receiver by Asahi Kasei
5 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
6 */
7
8 #include <linux/slab.h>
9 #include <linux/delay.h>
10 #include <linux/module.h>
11 #include <sound/core.h>
12 #include <sound/control.h>
13 #include <sound/pcm.h>
14 #include <sound/ak4117.h>
15 #include <sound/asoundef.h>
16
17 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
18 MODULE_DESCRIPTION("AK4117 IEC958 (S/PDIF) receiver by Asahi Kasei");
19 MODULE_LICENSE("GPL");
20
21 #define AK4117_ADDR 0x00 /* fixed address */
22
23 static void snd_ak4117_timer(struct timer_list *t);
24
25 static void reg_write(struct ak4117 *ak4117, unsigned char reg, unsigned char val)
26 {
27 ak4117->write(ak4117->private_data, reg, val);
28 if (reg < sizeof(ak4117->regmap))
29 ak4117->regmap[reg] = val;
30 }
31
32 static inline unsigned char reg_read(struct ak4117 *ak4117, unsigned char reg)
33 {
34 return ak4117->read(ak4117->private_data, reg);
35 }
36
37 #if 0
38 static void reg_dump(struct ak4117 *ak4117)
39 {
40 int i;
41
42 printk(KERN_DEBUG "AK4117 REG DUMP:\n");
43 for (i = 0; i < 0x1b; i++)
44 printk(KERN_DEBUG "reg[%02x] = %02x (%02x)\n", i, reg_read(ak4117, i), i < sizeof(ak4117->regmap) ? ak4117->regmap[i] : 0);
45 }
46 #endif
47
48 static void snd_ak4117_free(struct ak4117 *chip)
49 {
50 timer_shutdown_sync(&chip->timer);
51 kfree(chip);
52 }
53
54 static int snd_ak4117_dev_free(struct snd_device *device)
55 {
56 struct ak4117 *chip = device->device_data;
57 snd_ak4117_free(chip);
58 return 0;
59 }
60
61 int snd_ak4117_create(struct snd_card *card, ak4117_read_t *read, ak4117_write_t *write,
62 const unsigned char pgm[5], void *private_data, struct ak4117 **r_ak4117)
63 {
64 struct ak4117 *chip;
65 int err = 0;
66 unsigned char reg;
67 static const struct snd_device_ops ops = {
68 .dev_free = snd_ak4117_dev_free,
69 };
70
71 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
72 if (chip == NULL)
73 return -ENOMEM;
74 spin_lock_init(&chip->lock);
75 chip->card = card;
76 chip->read = read;
77 chip->write = write;
78 chip->private_data = private_data;
79 timer_setup(&chip->timer, snd_ak4117_timer, 0);
80
81 for (reg = 0; reg < 5; reg++)
82 chip->regmap[reg] = pgm[reg];
83 snd_ak4117_reinit(chip);
84
85 chip->rcs0 = reg_read(chip, AK4117_REG_RCS0) & ~(AK4117_QINT | AK4117_CINT | AK4117_STC);
86 chip->rcs1 = reg_read(chip, AK4117_REG_RCS1);
87 chip->rcs2 = reg_read(chip, AK4117_REG_RCS2);
88
89 err = snd_device_new(card, SNDRV_DEV_CODEC, chip, &ops);
90 if (err < 0)
91 goto __fail;
92
93 if (r_ak4117)
94 *r_ak4117 = chip;
95 return 0;
96
97 __fail:
98 snd_ak4117_free(chip);
99 return err;
100 }
101
102 void snd_ak4117_reg_write(struct ak4117 *chip, unsigned char reg, unsigned char mask, unsigned char val)
103 {
104 if (reg >= 5)
105 return;
106 reg_write(chip, reg, (chip->regmap[reg] & ~mask) | val);
107 }
108
109 void snd_ak4117_reinit(struct ak4117 *chip)
110 {
111 unsigned char old = chip->regmap[AK4117_REG_PWRDN], reg;
112
113 del_timer(&chip->timer);
114 chip->init = 1;
115 /* bring the chip to reset state and powerdown state */
116 reg_write(chip, AK4117_REG_PWRDN, 0);
117 udelay(200);
118 /* release reset, but leave powerdown */
119 reg_write(chip, AK4117_REG_PWRDN, (old | AK4117_RST) & ~AK4117_PWN);
120 udelay(200);
121 for (reg = 1; reg < 5; reg++)
122 reg_write(chip, reg, chip->regmap[reg]);
123 /* release powerdown, everything is initialized now */
124 reg_write(chip, AK4117_REG_PWRDN, old | AK4117_RST | AK4117_PWN);
125 chip->init = 0;
126 mod_timer(&chip->timer, 1 + jiffies);
127 }
128
129 static unsigned int external_rate(unsigned char rcs1)
130 {
131 switch (rcs1 & (AK4117_FS0|AK4117_FS1|AK4117_FS2|AK4117_FS3)) {
132 case AK4117_FS_32000HZ: return 32000;
133 case AK4117_FS_44100HZ: return 44100;
134 case AK4117_FS_48000HZ: return 48000;
135 case AK4117_FS_88200HZ: return 88200;
136 case AK4117_FS_96000HZ: return 96000;
137 case AK4117_FS_176400HZ: return 176400;
138 case AK4117_FS_192000HZ: return 192000;
139 default: return 0;
140 }
141 }
142
143 static int snd_ak4117_in_error_info(struct snd_kcontrol *kcontrol,
144 struct snd_ctl_elem_info *uinfo)
145 {
146 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
147 uinfo->count = 1;
148 uinfo->value.integer.min = 0;
149 uinfo->value.integer.max = LONG_MAX;
150 return 0;
151 }
152
153 static int snd_ak4117_in_error_get(struct snd_kcontrol *kcontrol,
154 struct snd_ctl_elem_value *ucontrol)
155 {
156 struct ak4117 *chip = snd_kcontrol_chip(kcontrol);
157
158 spin_lock_irq(&chip->lock);
159 ucontrol->value.integer.value[0] =
160 chip->errors[kcontrol->private_value];
161 chip->errors[kcontrol->private_value] = 0;
162 spin_unlock_irq(&chip->lock);
163 return 0;
164 }
165
166 #define snd_ak4117_in_bit_info snd_ctl_boolean_mono_info
167
168 static int snd_ak4117_in_bit_get(struct snd_kcontrol *kcontrol,
169 struct snd_ctl_elem_value *ucontrol)
170 {
171 struct ak4117 *chip = snd_kcontrol_chip(kcontrol);
172 unsigned char reg = kcontrol->private_value & 0xff;
173 unsigned char bit = (kcontrol->private_value >> 8) & 0xff;
174 unsigned char inv = (kcontrol->private_value >> 31) & 1;
175
176 ucontrol->value.integer.value[0] = ((reg_read(chip, reg) & (1 << bit)) ? 1 : 0) ^ inv;
177 return 0;
178 }
179
180 static int snd_ak4117_rx_info(struct snd_kcontrol *kcontrol,
181 struct snd_ctl_elem_info *uinfo)
182 {
183 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
184 uinfo->count = 1;
185 uinfo->value.integer.min = 0;
186 uinfo->value.integer.max = 1;
187 return 0;
188 }
189
190 static int snd_ak4117_rx_get(struct snd_kcontrol *kcontrol,
191 struct snd_ctl_elem_value *ucontrol)
192 {
193 struct ak4117 *chip = snd_kcontrol_chip(kcontrol);
194
195 ucontrol->value.integer.value[0] = (chip->regmap[AK4117_REG_IO] & AK4117_IPS) ? 1 : 0;
196 return 0;
197 }
198
199 static int snd_ak4117_rx_put(struct snd_kcontrol *kcontrol,
200 struct snd_ctl_elem_value *ucontrol)
201 {
202 struct ak4117 *chip = snd_kcontrol_chip(kcontrol);
203 int change;
204 u8 old_val;
205
206 spin_lock_irq(&chip->lock);
207 old_val = chip->regmap[AK4117_REG_IO];
208 change = !!ucontrol->value.integer.value[0] != ((old_val & AK4117_IPS) ? 1 : 0);
209 if (change)
210 reg_write(chip, AK4117_REG_IO, (old_val & ~AK4117_IPS) | (ucontrol->value.integer.value[0] ? AK4117_IPS : 0));
211 spin_unlock_irq(&chip->lock);
212 return change;
213 }
214
215 static int snd_ak4117_rate_info(struct snd_kcontrol *kcontrol,
216 struct snd_ctl_elem_info *uinfo)
217 {
218 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
219 uinfo->count = 1;
220 uinfo->value.integer.min = 0;
221 uinfo->value.integer.max = 192000;
222 return 0;
223 }
224
225 static int snd_ak4117_rate_get(struct snd_kcontrol *kcontrol,
226 struct snd_ctl_elem_value *ucontrol)
227 {
228 struct ak4117 *chip = snd_kcontrol_chip(kcontrol);
229
230 ucontrol->value.integer.value[0] = external_rate(reg_read(chip, AK4117_REG_RCS1));
231 return 0;
232 }
233
234 static int snd_ak4117_spdif_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
235 {
236 uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
237 uinfo->count = 1;
238 return 0;
239 }
240
241 static int snd_ak4117_spdif_get(struct snd_kcontrol *kcontrol,
242 struct snd_ctl_elem_value *ucontrol)
243 {
244 struct ak4117 *chip = snd_kcontrol_chip(kcontrol);
245 unsigned i;
246
247 for (i = 0; i < AK4117_REG_RXCSB_SIZE; i++)
248 ucontrol->value.iec958.status[i] = reg_read(chip, AK4117_REG_RXCSB0 + i);
249 return 0;
250 }
251
252 static int snd_ak4117_spdif_mask_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
253 {
254 uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
255 uinfo->count = 1;
256 return 0;
257 }
258
259 static int snd_ak4117_spdif_mask_get(struct snd_kcontrol *kcontrol,
260 struct snd_ctl_elem_value *ucontrol)
261 {
262 memset(ucontrol->value.iec958.status, 0xff, AK4117_REG_RXCSB_SIZE);
263 return 0;
264 }
265
266 static int snd_ak4117_spdif_pinfo(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
267 {
268 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
269 uinfo->value.integer.min = 0;
270 uinfo->value.integer.max = 0xffff;
271 uinfo->count = 4;
272 return 0;
273 }
274
275 static int snd_ak4117_spdif_pget(struct snd_kcontrol *kcontrol,
276 struct snd_ctl_elem_value *ucontrol)
277 {
278 struct ak4117 *chip = snd_kcontrol_chip(kcontrol);
279 unsigned short tmp;
280
281 ucontrol->value.integer.value[0] = 0xf8f2;
282 ucontrol->value.integer.value[1] = 0x4e1f;
283 tmp = reg_read(chip, AK4117_REG_Pc0) | (reg_read(chip, AK4117_REG_Pc1) << 8);
284 ucontrol->value.integer.value[2] = tmp;
285 tmp = reg_read(chip, AK4117_REG_Pd0) | (reg_read(chip, AK4117_REG_Pd1) << 8);
286 ucontrol->value.integer.value[3] = tmp;
287 return 0;
288 }
289
290 static int snd_ak4117_spdif_qinfo(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
291 {
292 uinfo->type = SNDRV_CTL_ELEM_TYPE_BYTES;
293 uinfo->count = AK4117_REG_QSUB_SIZE;
294 return 0;
295 }
296
297 static int snd_ak4117_spdif_qget(struct snd_kcontrol *kcontrol,
298 struct snd_ctl_elem_value *ucontrol)
299 {
300 struct ak4117 *chip = snd_kcontrol_chip(kcontrol);
301 unsigned i;
302
303 for (i = 0; i < AK4117_REG_QSUB_SIZE; i++)
304 ucontrol->value.bytes.data[i] = reg_read(chip, AK4117_REG_QSUB_ADDR + i);
305 return 0;
306 }
307
308 /* Don't forget to change AK4117_CONTROLS define!!! */
309 static const struct snd_kcontrol_new snd_ak4117_iec958_controls[] = {
310 {
311 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
312 .name = "IEC958 Parity Errors",
313 .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
314 .info = snd_ak4117_in_error_info,
315 .get = snd_ak4117_in_error_get,
316 .private_value = AK4117_PARITY_ERRORS,
317 },
318 {
319 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
320 .name = "IEC958 V-Bit Errors",
321 .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
322 .info = snd_ak4117_in_error_info,
323 .get = snd_ak4117_in_error_get,
324 .private_value = AK4117_V_BIT_ERRORS,
325 },
326 {
327 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
328 .name = "IEC958 C-CRC Errors",
329 .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
330 .info = snd_ak4117_in_error_info,
331 .get = snd_ak4117_in_error_get,
332 .private_value = AK4117_CCRC_ERRORS,
333 },
334 {
335 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
336 .name = "IEC958 Q-CRC Errors",
337 .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
338 .info = snd_ak4117_in_error_info,
339 .get = snd_ak4117_in_error_get,
340 .private_value = AK4117_QCRC_ERRORS,
341 },
342 {
343 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
344 .name = "IEC958 External Rate",
345 .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
346 .info = snd_ak4117_rate_info,
347 .get = snd_ak4117_rate_get,
348 },
349 {
350 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
351 .name = SNDRV_CTL_NAME_IEC958("",CAPTURE,MASK),
352 .access = SNDRV_CTL_ELEM_ACCESS_READ,
353 .info = snd_ak4117_spdif_mask_info,
354 .get = snd_ak4117_spdif_mask_get,
355 },
356 {
357 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
358 .name = SNDRV_CTL_NAME_IEC958("",CAPTURE,DEFAULT),
359 .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
360 .info = snd_ak4117_spdif_info,
361 .get = snd_ak4117_spdif_get,
362 },
363 {
364 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
365 .name = "IEC958 Preamble Capture Default",
366 .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
367 .info = snd_ak4117_spdif_pinfo,
368 .get = snd_ak4117_spdif_pget,
369 },
370 {
371 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
372 .name = "IEC958 Q-subcode Capture Default",
373 .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
374 .info = snd_ak4117_spdif_qinfo,
375 .get = snd_ak4117_spdif_qget,
376 },
377 {
378 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
379 .name = "IEC958 Audio",
380 .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
381 .info = snd_ak4117_in_bit_info,
382 .get = snd_ak4117_in_bit_get,
383 .private_value = (1<<31) | (3<<8) | AK4117_REG_RCS0,
384 },
385 {
386 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
387 .name = "IEC958 Non-PCM Bitstream",
388 .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
389 .info = snd_ak4117_in_bit_info,
390 .get = snd_ak4117_in_bit_get,
391 .private_value = (5<<8) | AK4117_REG_RCS1,
392 },
393 {
394 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
395 .name = "IEC958 DTS Bitstream",
396 .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
397 .info = snd_ak4117_in_bit_info,
398 .get = snd_ak4117_in_bit_get,
399 .private_value = (6<<8) | AK4117_REG_RCS1,
400 },
401 {
402 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
403 .name = "AK4117 Input Select",
404 .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_WRITE,
405 .info = snd_ak4117_rx_info,
406 .get = snd_ak4117_rx_get,
407 .put = snd_ak4117_rx_put,
408 }
409 };
410
411 int snd_ak4117_build(struct ak4117 *ak4117, struct snd_pcm_substream *cap_substream)
412 {
413 struct snd_kcontrol *kctl;
414 unsigned int idx;
415 int err;
416
417 if (snd_BUG_ON(!cap_substream))
418 return -EINVAL;
419 ak4117->substream = cap_substream;
420 for (idx = 0; idx < AK4117_CONTROLS; idx++) {
421 kctl = snd_ctl_new1(&snd_ak4117_iec958_controls[idx], ak4117);
422 if (kctl == NULL)
423 return -ENOMEM;
424 kctl->id.device = cap_substream->pcm->device;
425 kctl->id.subdevice = cap_substream->number;
426 err = snd_ctl_add(ak4117->card, kctl);
427 if (err < 0)
428 return err;
429 ak4117->kctls[idx] = kctl;
430 }
431 return 0;
432 }
433
434 int snd_ak4117_external_rate(struct ak4117 *ak4117)
435 {
436 unsigned char rcs1;
437
438 rcs1 = reg_read(ak4117, AK4117_REG_RCS1);
439 return external_rate(rcs1);
440 }
441
442 int snd_ak4117_check_rate_and_errors(struct ak4117 *ak4117, unsigned int flags)
443 {
444 struct snd_pcm_runtime *runtime = ak4117->substream ? ak4117->substream->runtime : NULL;
445 unsigned long _flags;
446 int res = 0;
447 unsigned char rcs0, rcs1, rcs2;
448 unsigned char c0, c1;
449
450 rcs1 = reg_read(ak4117, AK4117_REG_RCS1);
451 if (flags & AK4117_CHECK_NO_STAT)
452 goto __rate;
453 rcs0 = reg_read(ak4117, AK4117_REG_RCS0);
454 rcs2 = reg_read(ak4117, AK4117_REG_RCS2);
455 // printk(KERN_DEBUG "AK IRQ: rcs0 = 0x%x, rcs1 = 0x%x, rcs2 = 0x%x\n", rcs0, rcs1, rcs2);
456 spin_lock_irqsave(&ak4117->lock, _flags);
457 if (rcs0 & AK4117_PAR)
458 ak4117->errors[AK4117_PARITY_ERRORS]++;
459 if (rcs0 & AK4117_V)
460 ak4117->errors[AK4117_V_BIT_ERRORS]++;
461 if (rcs2 & AK4117_CCRC)
462 ak4117->errors[AK4117_CCRC_ERRORS]++;
463 if (rcs2 & AK4117_QCRC)
464 ak4117->errors[AK4117_QCRC_ERRORS]++;
465 c0 = (ak4117->rcs0 & (AK4117_QINT | AK4117_CINT | AK4117_STC | AK4117_AUDION | AK4117_AUTO | AK4117_UNLCK)) ^
466 (rcs0 & (AK4117_QINT | AK4117_CINT | AK4117_STC | AK4117_AUDION | AK4117_AUTO | AK4117_UNLCK));
467 c1 = (ak4117->rcs1 & (AK4117_DTSCD | AK4117_NPCM | AK4117_PEM | 0x0f)) ^
468 (rcs1 & (AK4117_DTSCD | AK4117_NPCM | AK4117_PEM | 0x0f));
469 ak4117->rcs0 = rcs0 & ~(AK4117_QINT | AK4117_CINT | AK4117_STC);
470 ak4117->rcs1 = rcs1;
471 ak4117->rcs2 = rcs2;
472 spin_unlock_irqrestore(&ak4117->lock, _flags);
473
474 if (rcs0 & AK4117_PAR)
475 snd_ctl_notify(ak4117->card, SNDRV_CTL_EVENT_MASK_VALUE, &ak4117->kctls[0]->id);
476 if (rcs0 & AK4117_V)
477 snd_ctl_notify(ak4117->card, SNDRV_CTL_EVENT_MASK_VALUE, &ak4117->kctls[1]->id);
478 if (rcs2 & AK4117_CCRC)
479 snd_ctl_notify(ak4117->card, SNDRV_CTL_EVENT_MASK_VALUE, &ak4117->kctls[2]->id);
480 if (rcs2 & AK4117_QCRC)
481 snd_ctl_notify(ak4117->card, SNDRV_CTL_EVENT_MASK_VALUE, &ak4117->kctls[3]->id);
482
483 /* rate change */
484 if (c1 & 0x0f)
485 snd_ctl_notify(ak4117->card, SNDRV_CTL_EVENT_MASK_VALUE, &ak4117->kctls[4]->id);
486
487 if ((c1 & AK4117_PEM) | (c0 & AK4117_CINT))
488 snd_ctl_notify(ak4117->card, SNDRV_CTL_EVENT_MASK_VALUE, &ak4117->kctls[6]->id);
489 if (c0 & AK4117_QINT)
490 snd_ctl_notify(ak4117->card, SNDRV_CTL_EVENT_MASK_VALUE, &ak4117->kctls[8]->id);
491
492 if (c0 & AK4117_AUDION)
493 snd_ctl_notify(ak4117->card, SNDRV_CTL_EVENT_MASK_VALUE, &ak4117->kctls[9]->id);
494 if (c1 & AK4117_NPCM)
495 snd_ctl_notify(ak4117->card, SNDRV_CTL_EVENT_MASK_VALUE, &ak4117->kctls[10]->id);
496 if (c1 & AK4117_DTSCD)
497 snd_ctl_notify(ak4117->card, SNDRV_CTL_EVENT_MASK_VALUE, &ak4117->kctls[11]->id);
498
499 if (ak4117->change_callback && (c0 | c1) != 0)
500 ak4117->change_callback(ak4117, c0, c1);
501
502 __rate:
503 /* compare rate */
504 res = external_rate(rcs1);
505 if (!(flags & AK4117_CHECK_NO_RATE) && runtime && runtime->rate != res) {
506 snd_pcm_stream_lock_irqsave(ak4117->substream, _flags);
507 if (snd_pcm_running(ak4117->substream)) {
508 // printk(KERN_DEBUG "rate changed (%i <- %i)\n", runtime->rate, res);
509 snd_pcm_stop(ak4117->substream, SNDRV_PCM_STATE_DRAINING);
510 wake_up(&runtime->sleep);
511 res = 1;
512 }
513 snd_pcm_stream_unlock_irqrestore(ak4117->substream, _flags);
514 }
515 return res;
516 }
517
518 static void snd_ak4117_timer(struct timer_list *t)
519 {
520 struct ak4117 *chip = from_timer(chip, t, timer);
521
522 if (chip->init)
523 return;
524 snd_ak4117_check_rate_and_errors(chip, 0);
525 mod_timer(&chip->timer, 1 + jiffies);
526 }
527
528 EXPORT_SYMBOL(snd_ak4117_create);
529 EXPORT_SYMBOL(snd_ak4117_reg_write);
530 EXPORT_SYMBOL(snd_ak4117_reinit);
531 EXPORT_SYMBOL(snd_ak4117_build);
532 EXPORT_SYMBOL(snd_ak4117_external_rate);
533 EXPORT_SYMBOL(snd_ak4117_check_rate_and_errors);
534
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