9c3d361accfb108e71bf2ceea04a42f0b12972dd
[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@perex.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 <linux/slab.h>
24 #include <linux/delay.h>
25 #include <linux/init.h>
26 #include <asm/unaligned.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@perex.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         put_unaligned_le32(SNDRV_PCM_DEFAULT_CON_SPDIF, buf);
269         memset(buf + 4, 0, 24 - 4);
270         if (snd_cs8427_send_corudata(device, 0, buf, 24) < 0)
271                 goto __fail;
272         memcpy(chip->playback.def_status, buf, 24);
273         memcpy(chip->playback.pcm_status, buf, 24);
274         snd_i2c_unlock(bus);
275
276         /* turn on run bit and rock'n'roll */
277         if (reset_timeout < 1)
278                 reset_timeout = 1;
279         chip->reset_timeout = reset_timeout;
280         snd_cs8427_reset(device);
281
282 #if 0   // it's nice for read tests
283         {
284         char buf[128];
285         int xx;
286         buf[0] = 0x81;
287         snd_i2c_sendbytes(device, buf, 1);
288         snd_i2c_readbytes(device, buf, 127);
289         for (xx = 0; xx < 127; xx++)
290                 printk(KERN_DEBUG "reg[0x%x] = 0x%x\n", xx+1, buf[xx]);
291         }
292 #endif
293         
294         if (r_cs8427)
295                 *r_cs8427 = device;
296         return 0;
297
298       __fail:
299         snd_i2c_unlock(bus);
300         snd_i2c_device_free(device);
301         return err < 0 ? err : -EIO;
302 }
303
304 EXPORT_SYMBOL(snd_cs8427_create);
305
306 /*
307  * Reset the chip using run bit, also lock PLL using ILRCK and
308  * put back AES3INPUT. This workaround is described in latest
309  * CS8427 datasheet, otherwise TXDSERIAL will not work.
310  */
311 static void snd_cs8427_reset(struct snd_i2c_device *cs8427)
312 {
313         struct cs8427 *chip;
314         unsigned long end_time;
315         int data, aes3input = 0;
316
317         snd_assert(cs8427, return);
318         chip = cs8427->private_data;
319         snd_i2c_lock(cs8427->bus);
320         if ((chip->regmap[CS8427_REG_CLOCKSOURCE] & CS8427_RXDAES3INPUT) ==
321             CS8427_RXDAES3INPUT)  /* AES3 bit is set */
322                 aes3input = 1;
323         chip->regmap[CS8427_REG_CLOCKSOURCE] &= ~(CS8427_RUN | CS8427_RXDMASK);
324         snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE,
325                              chip->regmap[CS8427_REG_CLOCKSOURCE]);
326         udelay(200);
327         chip->regmap[CS8427_REG_CLOCKSOURCE] |= CS8427_RUN | CS8427_RXDILRCK;
328         snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE,
329                              chip->regmap[CS8427_REG_CLOCKSOURCE]);
330         udelay(200);
331         snd_i2c_unlock(cs8427->bus);
332         end_time = jiffies + chip->reset_timeout;
333         while (time_after_eq(end_time, jiffies)) {
334                 snd_i2c_lock(cs8427->bus);
335                 data = snd_cs8427_reg_read(cs8427, CS8427_REG_RECVERRORS);
336                 snd_i2c_unlock(cs8427->bus);
337                 if (!(data & CS8427_UNLOCK))
338                         break;
339                 schedule_timeout_uninterruptible(1);
340         }
341         snd_i2c_lock(cs8427->bus);
342         chip->regmap[CS8427_REG_CLOCKSOURCE] &= ~CS8427_RXDMASK;
343         if (aes3input)
344                 chip->regmap[CS8427_REG_CLOCKSOURCE] |= CS8427_RXDAES3INPUT;
345         snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE,
346                              chip->regmap[CS8427_REG_CLOCKSOURCE]);
347         snd_i2c_unlock(cs8427->bus);
348 }
349
350 static int snd_cs8427_in_status_info(struct snd_kcontrol *kcontrol,
351                                      struct snd_ctl_elem_info *uinfo)
352 {
353         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
354         uinfo->count = 1;
355         uinfo->value.integer.min = 0;
356         uinfo->value.integer.max = 255;
357         return 0;
358 }
359
360 static int snd_cs8427_in_status_get(struct snd_kcontrol *kcontrol,
361                                     struct snd_ctl_elem_value *ucontrol)
362 {
363         struct snd_i2c_device *device = snd_kcontrol_chip(kcontrol);
364         int data;
365
366         snd_i2c_lock(device->bus);
367         data = snd_cs8427_reg_read(device, kcontrol->private_value);
368         snd_i2c_unlock(device->bus);
369         if (data < 0)
370                 return data;
371         ucontrol->value.integer.value[0] = data;
372         return 0;
373 }
374
375 static int snd_cs8427_qsubcode_info(struct snd_kcontrol *kcontrol,
376                                     struct snd_ctl_elem_info *uinfo)
377 {
378         uinfo->type = SNDRV_CTL_ELEM_TYPE_BYTES;
379         uinfo->count = 10;
380         return 0;
381 }
382
383 static int snd_cs8427_qsubcode_get(struct snd_kcontrol *kcontrol,
384                                    struct snd_ctl_elem_value *ucontrol)
385 {
386         struct snd_i2c_device *device = snd_kcontrol_chip(kcontrol);
387         unsigned char reg = CS8427_REG_QSUBCODE;
388         int err;
389
390         snd_i2c_lock(device->bus);
391         if ((err = snd_i2c_sendbytes(device, &reg, 1)) != 1) {
392                 snd_printk(KERN_ERR "unable to send register 0x%x byte "
393                            "to CS8427\n", reg);
394                 snd_i2c_unlock(device->bus);
395                 return err < 0 ? err : -EIO;
396         }
397         err = snd_i2c_readbytes(device, ucontrol->value.bytes.data, 10);
398         if (err != 10) {
399                 snd_printk(KERN_ERR "unable to read Q-subcode bytes "
400                            "from CS8427\n");
401                 snd_i2c_unlock(device->bus);
402                 return err < 0 ? err : -EIO;
403         }
404         snd_i2c_unlock(device->bus);
405         return 0;
406 }
407
408 static int snd_cs8427_spdif_info(struct snd_kcontrol *kcontrol,
409                                  struct snd_ctl_elem_info *uinfo)
410 {
411         uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
412         uinfo->count = 1;
413         return 0;
414 }
415
416 static int snd_cs8427_spdif_get(struct snd_kcontrol *kcontrol,
417                                 struct snd_ctl_elem_value *ucontrol)
418 {
419         struct snd_i2c_device *device = snd_kcontrol_chip(kcontrol);
420         struct cs8427 *chip = device->private_data;
421         
422         snd_i2c_lock(device->bus);
423         memcpy(ucontrol->value.iec958.status, chip->playback.def_status, 24);
424         snd_i2c_unlock(device->bus);
425         return 0;
426 }
427
428 static int snd_cs8427_spdif_put(struct snd_kcontrol *kcontrol,
429                                 struct snd_ctl_elem_value *ucontrol)
430 {
431         struct snd_i2c_device *device = snd_kcontrol_chip(kcontrol);
432         struct cs8427 *chip = device->private_data;
433         unsigned char *status = kcontrol->private_value ?
434                 chip->playback.pcm_status : chip->playback.def_status;
435         struct snd_pcm_runtime *runtime = chip->playback.substream ?
436                 chip->playback.substream->runtime : NULL;
437         int err, change;
438
439         snd_i2c_lock(device->bus);
440         change = memcmp(ucontrol->value.iec958.status, status, 24) != 0;
441         memcpy(status, ucontrol->value.iec958.status, 24);
442         if (change && (kcontrol->private_value ?
443                        runtime != NULL : runtime == NULL)) {
444                 err = snd_cs8427_send_corudata(device, 0, status, 24);
445                 if (err < 0)
446                         change = err;
447         }
448         snd_i2c_unlock(device->bus);
449         return change;
450 }
451
452 static int snd_cs8427_spdif_mask_info(struct snd_kcontrol *kcontrol,
453                                       struct snd_ctl_elem_info *uinfo)
454 {
455         uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
456         uinfo->count = 1;
457         return 0;
458 }
459
460 static int snd_cs8427_spdif_mask_get(struct snd_kcontrol *kcontrol,
461                                       struct snd_ctl_elem_value *ucontrol)
462 {
463         memset(ucontrol->value.iec958.status, 0xff, 24);
464         return 0;
465 }
466
467 static struct snd_kcontrol_new snd_cs8427_iec958_controls[] = {
468 {
469         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
470         .info =         snd_cs8427_in_status_info,
471         .name =         "IEC958 CS8427 Input Status",
472         .access =       (SNDRV_CTL_ELEM_ACCESS_READ |
473                          SNDRV_CTL_ELEM_ACCESS_VOLATILE),
474         .get =          snd_cs8427_in_status_get,
475         .private_value = 15,
476 },
477 {
478         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
479         .info =         snd_cs8427_in_status_info,
480         .name =         "IEC958 CS8427 Error Status",
481         .access =       (SNDRV_CTL_ELEM_ACCESS_READ |
482                          SNDRV_CTL_ELEM_ACCESS_VOLATILE),
483         .get =          snd_cs8427_in_status_get,
484         .private_value = 16,
485 },
486 {
487         .access =       SNDRV_CTL_ELEM_ACCESS_READ,
488         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
489         .name =         SNDRV_CTL_NAME_IEC958("",PLAYBACK,MASK),
490         .info =         snd_cs8427_spdif_mask_info,
491         .get =          snd_cs8427_spdif_mask_get,
492 },
493 {
494         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
495         .name =         SNDRV_CTL_NAME_IEC958("",PLAYBACK,DEFAULT),
496         .info =         snd_cs8427_spdif_info,
497         .get =          snd_cs8427_spdif_get,
498         .put =          snd_cs8427_spdif_put,
499         .private_value = 0
500 },
501 {
502         .access =       (SNDRV_CTL_ELEM_ACCESS_READWRITE |
503                          SNDRV_CTL_ELEM_ACCESS_INACTIVE),
504         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
505         .name =         SNDRV_CTL_NAME_IEC958("",PLAYBACK,PCM_STREAM),
506         .info =         snd_cs8427_spdif_info,
507         .get =          snd_cs8427_spdif_get,
508         .put =          snd_cs8427_spdif_put,
509         .private_value = 1
510 },
511 {
512         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
513         .info =         snd_cs8427_qsubcode_info,
514         .name =         "IEC958 Q-subcode Capture Default",
515         .access =       (SNDRV_CTL_ELEM_ACCESS_READ |
516                          SNDRV_CTL_ELEM_ACCESS_VOLATILE),
517         .get =          snd_cs8427_qsubcode_get
518 }};
519
520 int snd_cs8427_iec958_build(struct snd_i2c_device *cs8427,
521                             struct snd_pcm_substream *play_substream,
522                             struct snd_pcm_substream *cap_substream)
523 {
524         struct cs8427 *chip = cs8427->private_data;
525         struct snd_kcontrol *kctl;
526         unsigned int idx;
527         int err;
528
529         snd_assert(play_substream && cap_substream, return -EINVAL);
530         for (idx = 0; idx < ARRAY_SIZE(snd_cs8427_iec958_controls); idx++) {
531                 kctl = snd_ctl_new1(&snd_cs8427_iec958_controls[idx], cs8427);
532                 if (kctl == NULL)
533                         return -ENOMEM;
534                 kctl->id.device = play_substream->pcm->device;
535                 kctl->id.subdevice = play_substream->number;
536                 err = snd_ctl_add(cs8427->bus->card, kctl);
537                 if (err < 0)
538                         return err;
539                 if (! strcmp(kctl->id.name,
540                              SNDRV_CTL_NAME_IEC958("",PLAYBACK,PCM_STREAM)))
541                         chip->playback.pcm_ctl = kctl;
542         }
543
544         chip->playback.substream = play_substream;
545         chip->capture.substream = cap_substream;
546         snd_assert(chip->playback.pcm_ctl, return -EIO);
547         return 0;
548 }
549
550 EXPORT_SYMBOL(snd_cs8427_iec958_build);
551
552 int snd_cs8427_iec958_active(struct snd_i2c_device *cs8427, int active)
553 {
554         struct cs8427 *chip;
555
556         snd_assert(cs8427, return -ENXIO);
557         chip = cs8427->private_data;
558         if (active)
559                 memcpy(chip->playback.pcm_status,
560                        chip->playback.def_status, 24);
561         chip->playback.pcm_ctl->vd[0].access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
562         snd_ctl_notify(cs8427->bus->card,
563                        SNDRV_CTL_EVENT_MASK_VALUE | SNDRV_CTL_EVENT_MASK_INFO,
564                        &chip->playback.pcm_ctl->id);
565         return 0;
566 }
567
568 EXPORT_SYMBOL(snd_cs8427_iec958_active);
569
570 int snd_cs8427_iec958_pcm(struct snd_i2c_device *cs8427, unsigned int rate)
571 {
572         struct cs8427 *chip;
573         char *status;
574         int err, reset;
575
576         snd_assert(cs8427, return -ENXIO);
577         chip = cs8427->private_data;
578         status = chip->playback.pcm_status;
579         snd_i2c_lock(cs8427->bus);
580         if (status[0] & IEC958_AES0_PROFESSIONAL) {
581                 status[0] &= ~IEC958_AES0_PRO_FS;
582                 switch (rate) {
583                 case 32000: status[0] |= IEC958_AES0_PRO_FS_32000; break;
584                 case 44100: status[0] |= IEC958_AES0_PRO_FS_44100; break;
585                 case 48000: status[0] |= IEC958_AES0_PRO_FS_48000; break;
586                 default: status[0] |= IEC958_AES0_PRO_FS_NOTID; break;
587                 }
588         } else {
589                 status[3] &= ~IEC958_AES3_CON_FS;
590                 switch (rate) {
591                 case 32000: status[3] |= IEC958_AES3_CON_FS_32000; break;
592                 case 44100: status[3] |= IEC958_AES3_CON_FS_44100; break;
593                 case 48000: status[3] |= IEC958_AES3_CON_FS_48000; break;
594                 }
595         }
596         err = snd_cs8427_send_corudata(cs8427, 0, status, 24);
597         if (err > 0)
598                 snd_ctl_notify(cs8427->bus->card,
599                                SNDRV_CTL_EVENT_MASK_VALUE,
600                                &chip->playback.pcm_ctl->id);
601         reset = chip->rate != rate;
602         chip->rate = rate;
603         snd_i2c_unlock(cs8427->bus);
604         if (reset)
605                 snd_cs8427_reset(cs8427);
606         return err < 0 ? err : 0;
607 }
608
609 EXPORT_SYMBOL(snd_cs8427_iec958_pcm);
610
611 static int __init alsa_cs8427_module_init(void)
612 {
613         return 0;
614 }
615
616 static void __exit alsa_cs8427_module_exit(void)
617 {
618 }
619
620 module_init(alsa_cs8427_module_init)
621 module_exit(alsa_cs8427_module_exit)