e601caa6ea0b9c3d32b678374bd6d5f7b05c7f5f
[linux-2.6.git] / sound / i2c / cs8427.c
1 /*
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
33 static void snd_cs8427_reset(struct snd_i2c_device *cs8427);
34
35 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
36 MODULE_DESCRIPTION("IEC958 (S/PDIF) receiver & transmitter by Cirrus Logic");
37 MODULE_LICENSE("GPL");
38
39 #define CS8427_ADDR                     (0x20>>1) /* fixed address */
40
41 struct cs8427_stream {
42         struct snd_pcm_substream *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         struct snd_kcontrol *pcm_ctl;
48 };
49
50 struct cs8427 {
51         unsigned char regmap[0x14];     /* map of first 1 + 13 registers */
52         unsigned int rate;
53         unsigned int reset_timeout;
54         struct cs8427_stream playback;
55         struct cs8427_stream capture;
56 };
57
58 static 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
70 int snd_cs8427_reg_write(struct snd_i2c_device *device, unsigned char reg,
71                          unsigned char val)
72 {
73         int err;
74         unsigned char buf[2];
75
76         buf[0] = reg & 0x7f;
77         buf[1] = val;
78         if ((err = snd_i2c_sendbytes(device, buf, 2)) != 2) {
79                 snd_printk(KERN_ERR "unable to send bytes 0x%02x:0x%02x "
80                            "to CS8427 (%i)\n", buf[0], buf[1], err);
81                 return err < 0 ? err : -EIO;
82         }
83         return 0;
84 }
85
86 EXPORT_SYMBOL(snd_cs8427_reg_write);
87
88 static int snd_cs8427_reg_read(struct snd_i2c_device *device, unsigned char reg)
89 {
90         int err;
91         unsigned char buf;
92
93         if ((err = snd_i2c_sendbytes(device, &reg, 1)) != 1) {
94                 snd_printk(KERN_ERR "unable to send register 0x%x byte "
95                            "to CS8427\n", reg);
96                 return err < 0 ? err : -EIO;
97         }
98         if ((err = snd_i2c_readbytes(device, &buf, 1)) != 1) {
99                 snd_printk(KERN_ERR "unable to read register 0x%x byte "
100                            "from CS8427\n", reg);
101                 return err < 0 ? err : -EIO;
102         }
103         return buf;
104 }
105
106 static int snd_cs8427_select_corudata(struct snd_i2c_device *device, int udata)
107 {
108         struct cs8427 *chip = device->private_data;
109         int err;
110
111         udata = udata ? CS8427_BSEL : 0;
112         if (udata != (chip->regmap[CS8427_REG_CSDATABUF] & udata)) {
113                 chip->regmap[CS8427_REG_CSDATABUF] &= ~CS8427_BSEL;
114                 chip->regmap[CS8427_REG_CSDATABUF] |= udata;
115                 err = snd_cs8427_reg_write(device, CS8427_REG_CSDATABUF,
116                                            chip->regmap[CS8427_REG_CSDATABUF]);
117                 if (err < 0)
118                         return err;
119         }
120         return 0;
121 }
122
123 static int snd_cs8427_send_corudata(struct snd_i2c_device *device,
124                                     int udata,
125                                     unsigned char *ndata,
126                                     int count)
127 {
128         struct cs8427 *chip = device->private_data;
129         char *hw_data = udata ?
130                 chip->playback.hw_udata : chip->playback.hw_status;
131         char data[32];
132         int err, idx;
133
134         if (!memcmp(hw_data, ndata, count))
135                 return 0;
136         if ((err = snd_cs8427_select_corudata(device, udata)) < 0)
137                 return err;
138         memcpy(hw_data, ndata, count);
139         if (udata) {
140                 memset(data, 0, sizeof(data));
141                 if (memcmp(hw_data, data, count) == 0) {
142                         chip->regmap[CS8427_REG_UDATABUF] &= ~CS8427_UBMMASK;
143                         chip->regmap[CS8427_REG_UDATABUF] |= CS8427_UBMZEROS |
144                                 CS8427_EFTUI;
145                         err = snd_cs8427_reg_write(device, CS8427_REG_UDATABUF,
146                                                    chip->regmap[CS8427_REG_UDATABUF]);
147                         return err < 0 ? err : 0;
148                 }
149         }
150         data[0] = CS8427_REG_AUTOINC | CS8427_REG_CORU_DATABUF;
151         for (idx = 0; idx < count; idx++)
152                 data[idx + 1] = swapbits(ndata[idx]);
153         if (snd_i2c_sendbytes(device, data, count + 1) != count + 1)
154                 return -EIO;
155         return 1;
156 }
157
158 static void snd_cs8427_free(struct snd_i2c_device *device)
159 {
160         kfree(device->private_data);
161 }
162
163 int snd_cs8427_create(struct snd_i2c_bus *bus,
164                       unsigned char addr,
165                       unsigned int reset_timeout,
166                       struct snd_i2c_device **r_cs8427)
167 {
168         static unsigned char initvals1[] = {
169           CS8427_REG_CONTROL1 | CS8427_REG_AUTOINC,
170           /* CS8427_REG_CONTROL1: RMCK to OMCK, valid PCM audio, disable mutes,
171              TCBL=output */
172           CS8427_SWCLK | CS8427_TCBLDIR,
173           /* CS8427_REG_CONTROL2: hold last valid audio sample, RMCK=256*Fs,
174              normal stereo operation */
175           0x00,
176           /* CS8427_REG_DATAFLOW: output drivers normal operation, Tx<=serial,
177              Rx=>serial */
178           CS8427_TXDSERIAL | CS8427_SPDAES3RECEIVER,
179           /* CS8427_REG_CLOCKSOURCE: Run off, CMCK=256*Fs,
180              output time base = OMCK, input time base = recovered input clock,
181              recovered input clock source is ILRCK changed to AES3INPUT
182              (workaround, see snd_cs8427_reset) */
183           CS8427_RXDILRCK,
184           /* CS8427_REG_SERIALINPUT: Serial audio input port data format = I2S,
185              24-bit, 64*Fsi */
186           CS8427_SIDEL | CS8427_SILRPOL,
187           /* CS8427_REG_SERIALOUTPUT: Serial audio output port data format
188              = I2S, 24-bit, 64*Fsi */
189           CS8427_SODEL | CS8427_SOLRPOL,
190         };
191         static unsigned char initvals2[] = {
192           CS8427_REG_RECVERRMASK | CS8427_REG_AUTOINC,
193           /* CS8427_REG_RECVERRMASK: unmask the input PLL clock, V, confidence,
194              biphase, parity status bits */
195           /* CS8427_UNLOCK | CS8427_V | CS8427_CONF | CS8427_BIP | CS8427_PAR,*/
196           0xff, /* set everything */
197           /* CS8427_REG_CSDATABUF:
198              Registers 32-55 window to CS buffer
199              Inhibit D->E transfers from overwriting first 5 bytes of CS data.
200              Inhibit D->E transfers (all) of CS data.
201              Allow E->F transfer of CS data.
202              One byte mode; both A/B channels get same written CB data.
203              A channel info is output to chip's EMPH* pin. */
204           CS8427_CBMR | CS8427_DETCI,
205           /* CS8427_REG_UDATABUF:
206              Use internal buffer to transmit User (U) data.
207              Chip's U pin is an output.
208              Transmit all O's for user data.
209              Inhibit D->E transfers.
210              Inhibit E->F transfers. */
211           CS8427_UD | CS8427_EFTUI | CS8427_DETUI,
212         };
213         int err;
214         struct cs8427 *chip;
215         struct snd_i2c_device *device;
216         unsigned char buf[24];
217
218         if ((err = snd_i2c_device_create(bus, "CS8427",
219                                          CS8427_ADDR | (addr & 7),
220                                          &device)) < 0)
221                 return err;
222         chip = device->private_data = kzalloc(sizeof(*chip), GFP_KERNEL);
223         if (chip == NULL) {
224                 snd_i2c_device_free(device);
225                 return -ENOMEM;
226         }
227         device->private_free = snd_cs8427_free;
228         
229         snd_i2c_lock(bus);
230         err = snd_cs8427_reg_read(device, CS8427_REG_ID_AND_VER);
231         if (err != CS8427_VER8427A) {
232                 /* give second chance */
233                 snd_printk(KERN_WARNING "invalid CS8427 signature 0x%x: "
234                            "let me try again...\n", err);
235                 err = snd_cs8427_reg_read(device, CS8427_REG_ID_AND_VER);
236         }
237         if (err != CS8427_VER8427A) {
238                 snd_i2c_unlock(bus);
239                 snd_printk(KERN_ERR "unable to find CS8427 signature "
240                            "(expected 0x%x, read 0x%x),\n",
241                            CS8427_VER8427A, err);
242                 snd_printk(KERN_ERR "   initialization is not completed\n");
243                 return -EFAULT;
244         }
245         /* turn off run bit while making changes to configuration */
246         err = snd_cs8427_reg_write(device, CS8427_REG_CLOCKSOURCE, 0x00);
247         if (err < 0)
248                 goto __fail;
249         /* send initial values */
250         memcpy(chip->regmap + (initvals1[0] & 0x7f), initvals1 + 1, 6);
251         if ((err = snd_i2c_sendbytes(device, initvals1, 7)) != 7) {
252                 err = err < 0 ? err : -EIO;
253                 goto __fail;
254         }
255         /* Turn off CS8427 interrupt stuff that is not used in hardware */
256         memset(buf, 0, 7);
257         /* from address 9 to 15 */
258         buf[0] = 9;     /* register */
259         if ((err = snd_i2c_sendbytes(device, buf, 7)) != 7)
260                 goto __fail;
261         /* send transfer initialization sequence */
262         memcpy(chip->regmap + (initvals2[0] & 0x7f), initvals2 + 1, 3);
263         if ((err = snd_i2c_sendbytes(device, initvals2, 4)) != 4) {
264                 err = err < 0 ? err : -EIO;
265                 goto __fail;
266         }
267         /* write default channel status bytes */
268         buf[0] = ((unsigned char)(SNDRV_PCM_DEFAULT_CON_SPDIF >> 0));
269         buf[1] = ((unsigned char)(SNDRV_PCM_DEFAULT_CON_SPDIF >> 8));
270         buf[2] = ((unsigned char)(SNDRV_PCM_DEFAULT_CON_SPDIF >> 16));
271         buf[3] = ((unsigned char)(SNDRV_PCM_DEFAULT_CON_SPDIF >> 24));
272         memset(buf + 4, 0, 24 - 4);
273         if (snd_cs8427_send_corudata(device, 0, buf, 24) < 0)
274                 goto __fail;
275         memcpy(chip->playback.def_status, buf, 24);
276         memcpy(chip->playback.pcm_status, buf, 24);
277         snd_i2c_unlock(bus);
278
279         /* turn on run bit and rock'n'roll */
280         if (reset_timeout < 1)
281                 reset_timeout = 1;
282         chip->reset_timeout = reset_timeout;
283         snd_cs8427_reset(device);
284
285 #if 0   // it's nice for read tests
286         {
287         char buf[128];
288         int xx;
289         buf[0] = 0x81;
290         snd_i2c_sendbytes(device, buf, 1);
291         snd_i2c_readbytes(device, buf, 127);
292         for (xx = 0; xx < 127; xx++)
293                 printk(KERN_DEBUG "reg[0x%x] = 0x%x\n", xx+1, buf[xx]);
294         }
295 #endif
296         
297         if (r_cs8427)
298                 *r_cs8427 = device;
299         return 0;
300
301       __fail:
302         snd_i2c_unlock(bus);
303         snd_i2c_device_free(device);
304         return err < 0 ? err : -EIO;
305 }
306
307 EXPORT_SYMBOL(snd_cs8427_create);
308
309 /*
310  * Reset the chip using run bit, also lock PLL using ILRCK and
311  * put back AES3INPUT. This workaround is described in latest
312  * CS8427 datasheet, otherwise TXDSERIAL will not work.
313  */
314 static void snd_cs8427_reset(struct snd_i2c_device *cs8427)
315 {
316         struct cs8427 *chip;
317         unsigned long end_time;
318         int data, aes3input = 0;
319
320         snd_assert(cs8427, return);
321         chip = cs8427->private_data;
322         snd_i2c_lock(cs8427->bus);
323         if ((chip->regmap[CS8427_REG_CLOCKSOURCE] & CS8427_RXDAES3INPUT) ==
324             CS8427_RXDAES3INPUT)  /* AES3 bit is set */
325                 aes3input = 1;
326         chip->regmap[CS8427_REG_CLOCKSOURCE] &= ~(CS8427_RUN | CS8427_RXDMASK);
327         snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE,
328                              chip->regmap[CS8427_REG_CLOCKSOURCE]);
329         udelay(200);
330         chip->regmap[CS8427_REG_CLOCKSOURCE] |= CS8427_RUN | CS8427_RXDILRCK;
331         snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE,
332                              chip->regmap[CS8427_REG_CLOCKSOURCE]);
333         udelay(200);
334         snd_i2c_unlock(cs8427->bus);
335         end_time = jiffies + chip->reset_timeout;
336         while (time_after_eq(end_time, jiffies)) {
337                 snd_i2c_lock(cs8427->bus);
338                 data = snd_cs8427_reg_read(cs8427, CS8427_REG_RECVERRORS);
339                 snd_i2c_unlock(cs8427->bus);
340                 if (!(data & CS8427_UNLOCK))
341                         break;
342                 schedule_timeout_uninterruptible(1);
343         }
344         snd_i2c_lock(cs8427->bus);
345         chip->regmap[CS8427_REG_CLOCKSOURCE] &= ~CS8427_RXDMASK;
346         if (aes3input)
347                 chip->regmap[CS8427_REG_CLOCKSOURCE] |= CS8427_RXDAES3INPUT;
348         snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE,
349                              chip->regmap[CS8427_REG_CLOCKSOURCE]);
350         snd_i2c_unlock(cs8427->bus);
351 }
352
353 static int snd_cs8427_in_status_info(struct snd_kcontrol *kcontrol,
354                                      struct snd_ctl_elem_info *uinfo)
355 {
356         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
357         uinfo->count = 1;
358         uinfo->value.integer.min = 0;
359         uinfo->value.integer.max = 255;
360         return 0;
361 }
362
363 static int snd_cs8427_in_status_get(struct snd_kcontrol *kcontrol,
364                                     struct snd_ctl_elem_value *ucontrol)
365 {
366         struct snd_i2c_device *device = snd_kcontrol_chip(kcontrol);
367         int data;
368
369         snd_i2c_lock(device->bus);
370         data = snd_cs8427_reg_read(device, kcontrol->private_value);
371         snd_i2c_unlock(device->bus);
372         if (data < 0)
373                 return data;
374         ucontrol->value.integer.value[0] = data;
375         return 0;
376 }
377
378 static int snd_cs8427_qsubcode_info(struct snd_kcontrol *kcontrol,
379                                     struct snd_ctl_elem_info *uinfo)
380 {
381         uinfo->type = SNDRV_CTL_ELEM_TYPE_BYTES;
382         uinfo->count = 10;
383         return 0;
384 }
385
386 static int snd_cs8427_qsubcode_get(struct snd_kcontrol *kcontrol,
387                                    struct snd_ctl_elem_value *ucontrol)
388 {
389         struct snd_i2c_device *device = snd_kcontrol_chip(kcontrol);
390         unsigned char reg = CS8427_REG_QSUBCODE;
391         int err;
392
393         snd_i2c_lock(device->bus);
394         if ((err = snd_i2c_sendbytes(device, &reg, 1)) != 1) {
395                 snd_printk(KERN_ERR "unable to send register 0x%x byte "
396                            "to CS8427\n", reg);
397                 snd_i2c_unlock(device->bus);
398                 return err < 0 ? err : -EIO;
399         }
400         err = snd_i2c_readbytes(device, ucontrol->value.bytes.data, 10);
401         if (err != 10) {
402                 snd_printk(KERN_ERR "unable to read Q-subcode bytes "
403                            "from CS8427\n");
404                 snd_i2c_unlock(device->bus);
405                 return err < 0 ? err : -EIO;
406         }
407         snd_i2c_unlock(device->bus);
408         return 0;
409 }
410
411 static int snd_cs8427_spdif_info(struct snd_kcontrol *kcontrol,
412                                  struct snd_ctl_elem_info *uinfo)
413 {
414         uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
415         uinfo->count = 1;
416         return 0;
417 }
418
419 static int snd_cs8427_spdif_get(struct snd_kcontrol *kcontrol,
420                                 struct snd_ctl_elem_value *ucontrol)
421 {
422         struct snd_i2c_device *device = snd_kcontrol_chip(kcontrol);
423         struct cs8427 *chip = device->private_data;
424         
425         snd_i2c_lock(device->bus);
426         memcpy(ucontrol->value.iec958.status, chip->playback.def_status, 24);
427         snd_i2c_unlock(device->bus);
428         return 0;
429 }
430
431 static int snd_cs8427_spdif_put(struct snd_kcontrol *kcontrol,
432                                 struct snd_ctl_elem_value *ucontrol)
433 {
434         struct snd_i2c_device *device = snd_kcontrol_chip(kcontrol);
435         struct cs8427 *chip = device->private_data;
436         unsigned char *status = kcontrol->private_value ?
437                 chip->playback.pcm_status : chip->playback.def_status;
438         struct snd_pcm_runtime *runtime = chip->playback.substream ?
439                 chip->playback.substream->runtime : NULL;
440         int err, change;
441
442         snd_i2c_lock(device->bus);
443         change = memcmp(ucontrol->value.iec958.status, status, 24) != 0;
444         memcpy(status, ucontrol->value.iec958.status, 24);
445         if (change && (kcontrol->private_value ?
446                        runtime != NULL : runtime == NULL)) {
447                 err = snd_cs8427_send_corudata(device, 0, status, 24);
448                 if (err < 0)
449                         change = err;
450         }
451         snd_i2c_unlock(device->bus);
452         return change;
453 }
454
455 static int snd_cs8427_spdif_mask_info(struct snd_kcontrol *kcontrol,
456                                       struct snd_ctl_elem_info *uinfo)
457 {
458         uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
459         uinfo->count = 1;
460         return 0;
461 }
462
463 static int snd_cs8427_spdif_mask_get(struct snd_kcontrol *kcontrol,
464                                       struct snd_ctl_elem_value *ucontrol)
465 {
466         memset(ucontrol->value.iec958.status, 0xff, 24);
467         return 0;
468 }
469
470 static struct snd_kcontrol_new snd_cs8427_iec958_controls[] = {
471 {
472         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
473         .info =         snd_cs8427_in_status_info,
474         .name =         "IEC958 CS8427 Input Status",
475         .access =       (SNDRV_CTL_ELEM_ACCESS_READ |
476                          SNDRV_CTL_ELEM_ACCESS_VOLATILE),
477         .get =          snd_cs8427_in_status_get,
478         .private_value = 15,
479 },
480 {
481         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
482         .info =         snd_cs8427_in_status_info,
483         .name =         "IEC958 CS8427 Error Status",
484         .access =       (SNDRV_CTL_ELEM_ACCESS_READ |
485                          SNDRV_CTL_ELEM_ACCESS_VOLATILE),
486         .get =          snd_cs8427_in_status_get,
487         .private_value = 16,
488 },
489 {
490         .access =       SNDRV_CTL_ELEM_ACCESS_READ,
491         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
492         .name =         SNDRV_CTL_NAME_IEC958("",PLAYBACK,MASK),
493         .info =         snd_cs8427_spdif_mask_info,
494         .get =          snd_cs8427_spdif_mask_get,
495 },
496 {
497         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
498         .name =         SNDRV_CTL_NAME_IEC958("",PLAYBACK,DEFAULT),
499         .info =         snd_cs8427_spdif_info,
500         .get =          snd_cs8427_spdif_get,
501         .put =          snd_cs8427_spdif_put,
502         .private_value = 0
503 },
504 {
505         .access =       (SNDRV_CTL_ELEM_ACCESS_READWRITE |
506                          SNDRV_CTL_ELEM_ACCESS_INACTIVE),
507         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
508         .name =         SNDRV_CTL_NAME_IEC958("",PLAYBACK,PCM_STREAM),
509         .info =         snd_cs8427_spdif_info,
510         .get =          snd_cs8427_spdif_get,
511         .put =          snd_cs8427_spdif_put,
512         .private_value = 1
513 },
514 {
515         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
516         .info =         snd_cs8427_qsubcode_info,
517         .name =         "IEC958 Q-subcode Capture Default",
518         .access =       (SNDRV_CTL_ELEM_ACCESS_READ |
519                          SNDRV_CTL_ELEM_ACCESS_VOLATILE),
520         .get =          snd_cs8427_qsubcode_get
521 }};
522
523 int snd_cs8427_iec958_build(struct snd_i2c_device *cs8427,
524                             struct snd_pcm_substream *play_substream,
525                             struct snd_pcm_substream *cap_substream)
526 {
527         struct cs8427 *chip = cs8427->private_data;
528         struct snd_kcontrol *kctl;
529         unsigned int idx;
530         int err;
531
532         snd_assert(play_substream && cap_substream, return -EINVAL);
533         for (idx = 0; idx < ARRAY_SIZE(snd_cs8427_iec958_controls); idx++) {
534                 kctl = snd_ctl_new1(&snd_cs8427_iec958_controls[idx], cs8427);
535                 if (kctl == NULL)
536                         return -ENOMEM;
537                 kctl->id.device = play_substream->pcm->device;
538                 kctl->id.subdevice = play_substream->number;
539                 err = snd_ctl_add(cs8427->bus->card, kctl);
540                 if (err < 0)
541                         return err;
542                 if (! strcmp(kctl->id.name,
543                              SNDRV_CTL_NAME_IEC958("",PLAYBACK,PCM_STREAM)))
544                         chip->playback.pcm_ctl = kctl;
545         }
546
547         chip->playback.substream = play_substream;
548         chip->capture.substream = cap_substream;
549         snd_assert(chip->playback.pcm_ctl, return -EIO);
550         return 0;
551 }
552
553 EXPORT_SYMBOL(snd_cs8427_iec958_build);
554
555 int snd_cs8427_iec958_active(struct snd_i2c_device *cs8427, int active)
556 {
557         struct cs8427 *chip;
558
559         snd_assert(cs8427, return -ENXIO);
560         chip = cs8427->private_data;
561         if (active)
562                 memcpy(chip->playback.pcm_status,
563                        chip->playback.def_status, 24);
564         chip->playback.pcm_ctl->vd[0].access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
565         snd_ctl_notify(cs8427->bus->card,
566                        SNDRV_CTL_EVENT_MASK_VALUE | SNDRV_CTL_EVENT_MASK_INFO,
567                        &chip->playback.pcm_ctl->id);
568         return 0;
569 }
570
571 EXPORT_SYMBOL(snd_cs8427_iec958_active);
572
573 int snd_cs8427_iec958_pcm(struct snd_i2c_device *cs8427, unsigned int rate)
574 {
575         struct cs8427 *chip;
576         char *status;
577         int err, reset;
578
579         snd_assert(cs8427, return -ENXIO);
580         chip = cs8427->private_data;
581         status = chip->playback.pcm_status;
582         snd_i2c_lock(cs8427->bus);
583         if (status[0] & IEC958_AES0_PROFESSIONAL) {
584                 status[0] &= ~IEC958_AES0_PRO_FS;
585                 switch (rate) {
586                 case 32000: status[0] |= IEC958_AES0_PRO_FS_32000; break;
587                 case 44100: status[0] |= IEC958_AES0_PRO_FS_44100; break;
588                 case 48000: status[0] |= IEC958_AES0_PRO_FS_48000; break;
589                 default: status[0] |= IEC958_AES0_PRO_FS_NOTID; break;
590                 }
591         } else {
592                 status[3] &= ~IEC958_AES3_CON_FS;
593                 switch (rate) {
594                 case 32000: status[3] |= IEC958_AES3_CON_FS_32000; break;
595                 case 44100: status[3] |= IEC958_AES3_CON_FS_44100; break;
596                 case 48000: status[3] |= IEC958_AES3_CON_FS_48000; break;
597                 }
598         }
599         err = snd_cs8427_send_corudata(cs8427, 0, status, 24);
600         if (err > 0)
601                 snd_ctl_notify(cs8427->bus->card,
602                                SNDRV_CTL_EVENT_MASK_VALUE,
603                                &chip->playback.pcm_ctl->id);
604         reset = chip->rate != rate;
605         chip->rate = rate;
606         snd_i2c_unlock(cs8427->bus);
607         if (reset)
608                 snd_cs8427_reset(cs8427);
609         return err < 0 ? err : 0;
610 }
611
612 EXPORT_SYMBOL(snd_cs8427_iec958_pcm);
613
614 static int __init alsa_cs8427_module_init(void)
615 {
616         return 0;
617 }
618
619 static void __exit alsa_cs8427_module_exit(void)
620 {
621 }
622
623 module_init(alsa_cs8427_module_init)
624 module_exit(alsa_cs8427_module_exit)