blob: a3fda859dd15c177b70f532d6c81b6073cd0d6ee [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Routines for control of the CS8427 via i2c bus
3 * IEC958 (S/PDIF) receiver & transmitter by Cirrus Logic
4 * Copyright (c) by Jaroslav Kysela <perex@suse.cz>
5 *
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 *
21 */
22
23#include <sound/driver.h>
24#include <linux/slab.h>
25#include <linux/delay.h>
26#include <linux/init.h>
27#include <sound/core.h>
28#include <sound/control.h>
29#include <sound/pcm.h>
30#include <sound/cs8427.h>
31#include <sound/asoundef.h>
32
33static void snd_cs8427_reset(snd_i2c_device_t *cs8427);
34
35MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
36MODULE_DESCRIPTION("IEC958 (S/PDIF) receiver & transmitter by Cirrus Logic");
37MODULE_LICENSE("GPL");
38
39#define CS8427_ADDR (0x20>>1) /* fixed address */
40
41typedef struct {
42 snd_pcm_substream_t *substream;
43 char hw_status[24]; /* hardware status */
44 char def_status[24]; /* default status */
45 char pcm_status[24]; /* PCM private status */
46 char hw_udata[32];
47 snd_kcontrol_t *pcm_ctl;
48} cs8427_stream_t;
49
50typedef struct {
51 unsigned char regmap[0x14]; /* map of first 1 + 13 registers */
52 unsigned int rate;
53 unsigned int reset_timeout;
54 cs8427_stream_t playback;
55 cs8427_stream_t capture;
56} cs8427_t;
57
58static unsigned char swapbits(unsigned char val)
59{
60 int bit;
61 unsigned char res = 0;
62 for (bit = 0; bit < 8; bit++) {
63 res <<= 1;
64 res |= val & 1;
65 val >>= 1;
66 }
67 return res;
68}
69
70int snd_cs8427_reg_write(snd_i2c_device_t *device, unsigned char reg, unsigned char val)
71{
72 int err;
73 unsigned char buf[2];
74
75 buf[0] = reg & 0x7f;
76 buf[1] = val;
77 if ((err = snd_i2c_sendbytes(device, buf, 2)) != 2) {
78 snd_printk("unable to send bytes 0x%02x:0x%02x to CS8427 (%i)\n", buf[0], buf[1], err);
79 return err < 0 ? err : -EIO;
80 }
81 return 0;
82}
83
84static int snd_cs8427_reg_read(snd_i2c_device_t *device, unsigned char reg)
85{
86 int err;
87 unsigned char buf;
88
89 if ((err = snd_i2c_sendbytes(device, &reg, 1)) != 1) {
90 snd_printk("unable to send register 0x%x byte to CS8427\n", reg);
91 return err < 0 ? err : -EIO;
92 }
93 if ((err = snd_i2c_readbytes(device, &buf, 1)) != 1) {
94 snd_printk("unable to read register 0x%x byte from CS8427\n", reg);
95 return err < 0 ? err : -EIO;
96 }
97 return buf;
98}
99
100static int snd_cs8427_select_corudata(snd_i2c_device_t *device, int udata)
101{
102 cs8427_t *chip = device->private_data;
103 int err;
104
105 udata = udata ? CS8427_BSEL : 0;
106 if (udata != (chip->regmap[CS8427_REG_CSDATABUF] & udata)) {
107 chip->regmap[CS8427_REG_CSDATABUF] &= ~CS8427_BSEL;
108 chip->regmap[CS8427_REG_CSDATABUF] |= udata;
109 err = snd_cs8427_reg_write(device, CS8427_REG_CSDATABUF, chip->regmap[CS8427_REG_CSDATABUF]);
110 if (err < 0)
111 return err;
112 }
113 return 0;
114}
115
116static int snd_cs8427_send_corudata(snd_i2c_device_t *device,
117 int udata,
118 unsigned char *ndata,
119 int count)
120{
121 cs8427_t *chip = device->private_data;
122 char *hw_data = udata ? chip->playback.hw_udata : chip->playback.hw_status;
123 char data[32];
124 int err, idx;
125
126 if (!memcmp(hw_data, ndata, count))
127 return 0;
128 if ((err = snd_cs8427_select_corudata(device, udata)) < 0)
129 return err;
130 memcpy(hw_data, ndata, count);
131 if (udata) {
132 memset(data, 0, sizeof(data));
133 if (memcmp(hw_data, data, count) == 0) {
134 chip->regmap[CS8427_REG_UDATABUF] &= ~CS8427_UBMMASK;
135 chip->regmap[CS8427_REG_UDATABUF] |= CS8427_UBMZEROS | CS8427_EFTUI;
136 if ((err = snd_cs8427_reg_write(device, CS8427_REG_UDATABUF, chip->regmap[CS8427_REG_UDATABUF])) < 0)
137 return err;
138 return 0;
139 }
140 }
141 data[0] = CS8427_REG_AUTOINC | CS8427_REG_CORU_DATABUF;
142 for (idx = 0; idx < count; idx++)
143 data[idx + 1] = swapbits(ndata[idx]);
144 if (snd_i2c_sendbytes(device, data, count + 1) != count + 1)
145 return -EIO;
146 return 1;
147}
148
149static void snd_cs8427_free(snd_i2c_device_t *device)
150{
151 kfree(device->private_data);
152}
153
154int snd_cs8427_create(snd_i2c_bus_t *bus,
155 unsigned char addr,
156 unsigned int reset_timeout,
157 snd_i2c_device_t **r_cs8427)
158{
159 static unsigned char initvals1[] = {
160 CS8427_REG_CONTROL1 | CS8427_REG_AUTOINC,
161 /* CS8427_REG_CONTROL1: RMCK to OMCK, valid PCM audio, disable mutes, TCBL=output */
162 CS8427_SWCLK | CS8427_TCBLDIR,
163 /* CS8427_REG_CONTROL2: hold last valid audio sample, RMCK=256*Fs, normal stereo operation */
164 0x00,
165 /* CS8427_REG_DATAFLOW: output drivers normal operation, Tx<=serial, Rx=>serial */
166 CS8427_TXDSERIAL | CS8427_SPDAES3RECEIVER,
167 /* CS8427_REG_CLOCKSOURCE: Run off, CMCK=256*Fs, output time base = OMCK, input time base =
168 recovered input clock, recovered input clock source is ILRCK changed to AES3INPUT (workaround, see snd_cs8427_reset) */
169 CS8427_RXDILRCK,
170 /* CS8427_REG_SERIALINPUT: Serial audio input port data format = I2S, 24-bit, 64*Fsi */
171 CS8427_SIDEL | CS8427_SILRPOL,
172 /* CS8427_REG_SERIALOUTPUT: Serial audio output port data format = I2S, 24-bit, 64*Fsi */
173 CS8427_SODEL | CS8427_SOLRPOL,
174 };
175 static unsigned char initvals2[] = {
176 CS8427_REG_RECVERRMASK | CS8427_REG_AUTOINC,
177 /* CS8427_REG_RECVERRMASK: unmask the input PLL clock, V, confidence, biphase, parity status bits */
178 /* CS8427_UNLOCK | CS8427_V | CS8427_CONF | CS8427_BIP | CS8427_PAR, */
179 0xff, /* set everything */
180 /* CS8427_REG_CSDATABUF:
181 Registers 32-55 window to CS buffer
182 Inhibit D->E transfers from overwriting first 5 bytes of CS data.
183 Inhibit D->E transfers (all) of CS data.
184 Allow E->F transfer of CS data.
185 One byte mode; both A/B channels get same written CB data.
186 A channel info is output to chip's EMPH* pin. */
187 CS8427_CBMR | CS8427_DETCI,
188 /* CS8427_REG_UDATABUF:
189 Use internal buffer to transmit User (U) data.
190 Chip's U pin is an output.
191 Transmit all O's for user data.
192 Inhibit D->E transfers.
193 Inhibit E->F transfers. */
194 CS8427_UD | CS8427_EFTUI | CS8427_DETUI,
195 };
196 int err;
197 cs8427_t *chip;
198 snd_i2c_device_t *device;
199 unsigned char buf[24];
200
201 if ((err = snd_i2c_device_create(bus, "CS8427", CS8427_ADDR | (addr & 7), &device)) < 0)
202 return err;
203 chip = device->private_data = kcalloc(1, sizeof(*chip), GFP_KERNEL);
204 if (chip == NULL) {
205 snd_i2c_device_free(device);
206 return -ENOMEM;
207 }
208 device->private_free = snd_cs8427_free;
209
210 snd_i2c_lock(bus);
211 if ((err = snd_cs8427_reg_read(device, CS8427_REG_ID_AND_VER)) != CS8427_VER8427A) {
212 snd_i2c_unlock(bus);
213 snd_printk("unable to find CS8427 signature (expected 0x%x, read 0x%x), initialization is not completed\n", CS8427_VER8427A, err);
214 return -EFAULT;
215 }
216 /* turn off run bit while making changes to configuration */
217 if ((err = snd_cs8427_reg_write(device, CS8427_REG_CLOCKSOURCE, 0x00)) < 0)
218 goto __fail;
219 /* send initial values */
220 memcpy(chip->regmap + (initvals1[0] & 0x7f), initvals1 + 1, 6);
221 if ((err = snd_i2c_sendbytes(device, initvals1, 7)) != 7) {
222 err = err < 0 ? err : -EIO;
223 goto __fail;
224 }
225 /* Turn off CS8427 interrupt stuff that is not used in hardware */
226 memset(buf, 0, 7);
227 /* from address 9 to 15 */
228 buf[0] = 9; /* register */
229 if ((err = snd_i2c_sendbytes(device, buf, 7)) != 7)
230 goto __fail;
231 /* send transfer initialization sequence */
232 memcpy(chip->regmap + (initvals2[0] & 0x7f), initvals2 + 1, 3);
233 if ((err = snd_i2c_sendbytes(device, initvals2, 4)) != 4) {
234 err = err < 0 ? err : -EIO;
235 goto __fail;
236 }
237 /* write default channel status bytes */
238 buf[0] = ((unsigned char)(SNDRV_PCM_DEFAULT_CON_SPDIF >> 0));
239 buf[1] = ((unsigned char)(SNDRV_PCM_DEFAULT_CON_SPDIF >> 8));
240 buf[2] = ((unsigned char)(SNDRV_PCM_DEFAULT_CON_SPDIF >> 16));
241 buf[3] = ((unsigned char)(SNDRV_PCM_DEFAULT_CON_SPDIF >> 24));
242 memset(buf + 4, 0, 24 - 4);
243 if (snd_cs8427_send_corudata(device, 0, buf, 24) < 0)
244 goto __fail;
245 memcpy(chip->playback.def_status, buf, 24);
246 memcpy(chip->playback.pcm_status, buf, 24);
247 snd_i2c_unlock(bus);
248
249 /* turn on run bit and rock'n'roll */
250 if (reset_timeout < 1)
251 reset_timeout = 1;
252 chip->reset_timeout = reset_timeout;
253 snd_cs8427_reset(device);
254
255#if 0 // it's nice for read tests
256 {
257 char buf[128];
258 int xx;
259 buf[0] = 0x81;
260 snd_i2c_sendbytes(device, buf, 1);
261 snd_i2c_readbytes(device, buf, 127);
262 for (xx = 0; xx < 127; xx++)
263 printk("reg[0x%x] = 0x%x\n", xx+1, buf[xx]);
264 }
265#endif
266
267 if (r_cs8427)
268 *r_cs8427 = device;
269 return 0;
270
271 __fail:
272 snd_i2c_unlock(bus);
273 snd_i2c_device_free(device);
274 return err < 0 ? err : -EIO;
275}
276
277/*
278 * Reset the chip using run bit, also lock PLL using ILRCK and
279 * put back AES3INPUT. This workaround is described in latest
280 * CS8427 datasheet, otherwise TXDSERIAL will not work.
281 */
282static void snd_cs8427_reset(snd_i2c_device_t *cs8427)
283{
284 cs8427_t *chip;
285 unsigned long end_time;
286 int data;
287
288 snd_assert(cs8427, return);
289 chip = cs8427->private_data;
290 snd_i2c_lock(cs8427->bus);
291 chip->regmap[CS8427_REG_CLOCKSOURCE] &= ~(CS8427_RUN | CS8427_RXDMASK);
292 snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE, chip->regmap[CS8427_REG_CLOCKSOURCE]);
293 udelay(200);
294 chip->regmap[CS8427_REG_CLOCKSOURCE] |= CS8427_RUN | CS8427_RXDILRCK;
295 snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE, chip->regmap[CS8427_REG_CLOCKSOURCE]);
296 udelay(200);
297 snd_i2c_unlock(cs8427->bus);
298 end_time = jiffies + chip->reset_timeout;
299 while (time_after_eq(end_time, jiffies)) {
300 snd_i2c_lock(cs8427->bus);
301 data = snd_cs8427_reg_read(cs8427, CS8427_REG_RECVERRORS);
302 snd_i2c_unlock(cs8427->bus);
303 if (!(data & CS8427_UNLOCK))
304 break;
305 set_current_state(TASK_UNINTERRUPTIBLE);
306 schedule_timeout(1);
307 }
308 snd_i2c_lock(cs8427->bus);
309 chip->regmap[CS8427_REG_CLOCKSOURCE] &= ~CS8427_RXDMASK;
310 chip->regmap[CS8427_REG_CLOCKSOURCE] |= CS8427_RXDAES3INPUT;
311 snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE, chip->regmap[CS8427_REG_CLOCKSOURCE]);
312 snd_i2c_unlock(cs8427->bus);
313}
314
315static int snd_cs8427_in_status_info(snd_kcontrol_t *kcontrol,
316 snd_ctl_elem_info_t *uinfo)
317{
318 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
319 uinfo->count = 1;
320 uinfo->value.integer.min = 0;
321 uinfo->value.integer.max = 255;
322 return 0;
323}
324
325static int snd_cs8427_in_status_get(snd_kcontrol_t *kcontrol,
326 snd_ctl_elem_value_t *ucontrol)
327{
328 snd_i2c_device_t *device = snd_kcontrol_chip(kcontrol);
329 int data;
330
331 snd_i2c_lock(device->bus);
332 data = snd_cs8427_reg_read(device, kcontrol->private_value);
333 snd_i2c_unlock(device->bus);
334 if (data < 0)
335 return data;
336 ucontrol->value.integer.value[0] = data;
337 return 0;
338}
339
340static int snd_cs8427_qsubcode_info(snd_kcontrol_t *kcontrol,
341 snd_ctl_elem_info_t *uinfo)
342{
343 uinfo->type = SNDRV_CTL_ELEM_TYPE_BYTES;
344 uinfo->count = 10;
345 return 0;
346}
347
348static int snd_cs8427_qsubcode_get(snd_kcontrol_t *kcontrol,
349 snd_ctl_elem_value_t *ucontrol)
350{
351 snd_i2c_device_t *device = snd_kcontrol_chip(kcontrol);
352 unsigned char reg = CS8427_REG_QSUBCODE;
353 int err;
354
355 snd_i2c_lock(device->bus);
356 if ((err = snd_i2c_sendbytes(device, &reg, 1)) != 1) {
357 snd_printk("unable to send register 0x%x byte to CS8427\n", reg);
358 snd_i2c_unlock(device->bus);
359 return err < 0 ? err : -EIO;
360 }
361 if ((err = snd_i2c_readbytes(device, ucontrol->value.bytes.data, 10)) != 10) {
362 snd_printk("unable to read Q-subcode bytes from CS8427\n");
363 snd_i2c_unlock(device->bus);
364 return err < 0 ? err : -EIO;
365 }
366 snd_i2c_unlock(device->bus);
367 return 0;
368}
369
370static int snd_cs8427_spdif_info(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t * uinfo)
371{
372 uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
373 uinfo->count = 1;
374 return 0;
375}
376
377static int snd_cs8427_spdif_get(snd_kcontrol_t * kcontrol,
378 snd_ctl_elem_value_t * ucontrol)
379{
380 snd_i2c_device_t *device = snd_kcontrol_chip(kcontrol);
381 cs8427_t *chip = device->private_data;
382
383 snd_i2c_lock(device->bus);
384 memcpy(ucontrol->value.iec958.status, chip->playback.def_status, 24);
385 snd_i2c_unlock(device->bus);
386 return 0;
387}
388
389static int snd_cs8427_spdif_put(snd_kcontrol_t * kcontrol,
390 snd_ctl_elem_value_t * ucontrol)
391{
392 snd_i2c_device_t *device = snd_kcontrol_chip(kcontrol);
393 cs8427_t *chip = device->private_data;
394 unsigned char *status = kcontrol->private_value ? chip->playback.pcm_status : chip->playback.def_status;
395 snd_pcm_runtime_t *runtime = chip->playback.substream ? chip->playback.substream->runtime : NULL;
396 int err, change;
397
398 snd_i2c_lock(device->bus);
399 change = memcmp(ucontrol->value.iec958.status, status, 24) != 0;
400 memcpy(status, ucontrol->value.iec958.status, 24);
401 if (change && (kcontrol->private_value ? runtime != NULL : runtime == NULL)) {
402 err = snd_cs8427_send_corudata(device, 0, status, 24);
403 if (err < 0)
404 change = err;
405 }
406 snd_i2c_unlock(device->bus);
407 return change;
408}
409
410static int snd_cs8427_spdif_mask_info(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t * uinfo)
411{
412 uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
413 uinfo->count = 1;
414 return 0;
415}
416
417static int snd_cs8427_spdif_mask_get(snd_kcontrol_t * kcontrol,
418 snd_ctl_elem_value_t * ucontrol)
419{
420 memset(ucontrol->value.iec958.status, 0xff, 24);
421 return 0;
422}
423
424static snd_kcontrol_new_t snd_cs8427_iec958_controls[] = {
425{
426 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
427 .info = snd_cs8427_in_status_info,
428 .name = "IEC958 CS8427 Input Status",
429 .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
430 .get = snd_cs8427_in_status_get,
431 .private_value = 15,
432},
433{
434 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
435 .info = snd_cs8427_in_status_info,
436 .name = "IEC958 CS8427 Error Status",
437 .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
438 .get = snd_cs8427_in_status_get,
439 .private_value = 16,
440},
441{
442 .access = SNDRV_CTL_ELEM_ACCESS_READ,
443 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
444 .name = SNDRV_CTL_NAME_IEC958("",PLAYBACK,MASK),
445 .info = snd_cs8427_spdif_mask_info,
446 .get = snd_cs8427_spdif_mask_get,
447},
448{
449 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
450 .name = SNDRV_CTL_NAME_IEC958("",PLAYBACK,DEFAULT),
451 .info = snd_cs8427_spdif_info,
452 .get = snd_cs8427_spdif_get,
453 .put = snd_cs8427_spdif_put,
454 .private_value = 0
455},
456{
457 .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_INACTIVE,
458 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
459 .name = SNDRV_CTL_NAME_IEC958("",PLAYBACK,PCM_STREAM),
460 .info = snd_cs8427_spdif_info,
461 .get = snd_cs8427_spdif_get,
462 .put = snd_cs8427_spdif_put,
463 .private_value = 1
464},
465{
466 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
467 .info = snd_cs8427_qsubcode_info,
468 .name = "IEC958 Q-subcode Capture Default",
469 .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
470 .get = snd_cs8427_qsubcode_get
471}};
472
473int snd_cs8427_iec958_build(snd_i2c_device_t *cs8427,
474 snd_pcm_substream_t *play_substream,
475 snd_pcm_substream_t *cap_substream)
476{
477 cs8427_t *chip = cs8427->private_data;
478 snd_kcontrol_t *kctl;
479 unsigned int idx;
480 int err;
481
482 snd_assert(play_substream && cap_substream, return -EINVAL);
483 for (idx = 0; idx < ARRAY_SIZE(snd_cs8427_iec958_controls); idx++) {
484 kctl = snd_ctl_new1(&snd_cs8427_iec958_controls[idx], cs8427);
485 if (kctl == NULL)
486 return -ENOMEM;
487 kctl->id.device = play_substream->pcm->device;
488 kctl->id.subdevice = play_substream->number;
489 err = snd_ctl_add(cs8427->bus->card, kctl);
490 if (err < 0)
491 return err;
492 if (!strcmp(kctl->id.name, SNDRV_CTL_NAME_IEC958("",PLAYBACK,PCM_STREAM)))
493 chip->playback.pcm_ctl = kctl;
494 }
495
496 chip->playback.substream = play_substream;
497 chip->capture.substream = cap_substream;
498 snd_assert(chip->playback.pcm_ctl, return -EIO);
499 return 0;
500}
501
502int snd_cs8427_iec958_active(snd_i2c_device_t *cs8427, int active)
503{
504 cs8427_t *chip;
505
506 snd_assert(cs8427, return -ENXIO);
507 chip = cs8427->private_data;
508 if (active)
509 memcpy(chip->playback.pcm_status, chip->playback.def_status, 24);
510 chip->playback.pcm_ctl->vd[0].access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
511 snd_ctl_notify(cs8427->bus->card, SNDRV_CTL_EVENT_MASK_VALUE |
512 SNDRV_CTL_EVENT_MASK_INFO, &chip->playback.pcm_ctl->id);
513 return 0;
514}
515
516int snd_cs8427_iec958_pcm(snd_i2c_device_t *cs8427, unsigned int rate)
517{
518 cs8427_t *chip;
519 char *status;
520 int err, reset;
521
522 snd_assert(cs8427, return -ENXIO);
523 chip = cs8427->private_data;
524 status = chip->playback.pcm_status;
525 snd_i2c_lock(cs8427->bus);
526 if (status[0] & IEC958_AES0_PROFESSIONAL) {
527 status[0] &= ~IEC958_AES0_PRO_FS;
528 switch (rate) {
529 case 32000: status[0] |= IEC958_AES0_PRO_FS_32000; break;
530 case 44100: status[0] |= IEC958_AES0_PRO_FS_44100; break;
531 case 48000: status[0] |= IEC958_AES0_PRO_FS_48000; break;
532 default: status[0] |= IEC958_AES0_PRO_FS_NOTID; break;
533 }
534 } else {
535 status[3] &= ~IEC958_AES3_CON_FS;
536 switch (rate) {
537 case 32000: status[3] |= IEC958_AES3_CON_FS_32000; break;
538 case 44100: status[3] |= IEC958_AES3_CON_FS_44100; break;
539 case 48000: status[3] |= IEC958_AES3_CON_FS_48000; break;
540 }
541 }
542 err = snd_cs8427_send_corudata(cs8427, 0, status, 24);
543 if (err > 0)
544 snd_ctl_notify(cs8427->bus->card,
545 SNDRV_CTL_EVENT_MASK_VALUE,
546 &chip->playback.pcm_ctl->id);
547 reset = chip->rate != rate;
548 chip->rate = rate;
549 snd_i2c_unlock(cs8427->bus);
550 if (reset)
551 snd_cs8427_reset(cs8427);
552 return err < 0 ? err : 0;
553}
554
555static int __init alsa_cs8427_module_init(void)
556{
557 return 0;
558}
559
560static void __exit alsa_cs8427_module_exit(void)
561{
562}
563
564module_init(alsa_cs8427_module_init)
565module_exit(alsa_cs8427_module_exit)
566
567EXPORT_SYMBOL(snd_cs8427_create);
568EXPORT_SYMBOL(snd_cs8427_reset);
569EXPORT_SYMBOL(snd_cs8427_reg_write);
570EXPORT_SYMBOL(snd_cs8427_iec958_build);
571EXPORT_SYMBOL(snd_cs8427_iec958_active);
572EXPORT_SYMBOL(snd_cs8427_iec958_pcm);