Version:  2.0.40 2.2.26 2.4.37 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17

Linux/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 <linux/bitrev.h>
 27 #include <linux/module.h>
 28 #include <asm/unaligned.h>
 29 #include <sound/core.h>
 30 #include <sound/control.h>
 31 #include <sound/pcm.h>
 32 #include <sound/cs8427.h>
 33 #include <sound/asoundef.h>
 34 
 35 static void snd_cs8427_reset(struct snd_i2c_device *cs8427);
 36 
 37 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
 38 MODULE_DESCRIPTION("IEC958 (S/PDIF) receiver & transmitter by Cirrus Logic");
 39 MODULE_LICENSE("GPL");
 40 
 41 #define CS8427_ADDR                     (0x20>>1) /* fixed address */
 42 
 43 struct cs8427_stream {
 44         struct snd_pcm_substream *substream;
 45         char hw_status[24];             /* hardware status */
 46         char def_status[24];            /* default status */
 47         char pcm_status[24];            /* PCM private status */
 48         char hw_udata[32];
 49         struct snd_kcontrol *pcm_ctl;
 50 };
 51 
 52 struct cs8427 {
 53         unsigned char regmap[0x14];     /* map of first 1 + 13 registers */
 54         unsigned int rate;
 55         unsigned int reset_timeout;
 56         struct cs8427_stream playback;
 57         struct cs8427_stream capture;
 58 };
 59 
 60 int snd_cs8427_reg_write(struct snd_i2c_device *device, unsigned char reg,
 61                          unsigned char val)
 62 {
 63         int err;
 64         unsigned char buf[2];
 65 
 66         buf[0] = reg & 0x7f;
 67         buf[1] = val;
 68         if ((err = snd_i2c_sendbytes(device, buf, 2)) != 2) {
 69                 snd_printk(KERN_ERR "unable to send bytes 0x%02x:0x%02x "
 70                            "to CS8427 (%i)\n", buf[0], buf[1], err);
 71                 return err < 0 ? err : -EIO;
 72         }
 73         return 0;
 74 }
 75 
 76 EXPORT_SYMBOL(snd_cs8427_reg_write);
 77 
 78 static int snd_cs8427_reg_read(struct snd_i2c_device *device, unsigned char reg)
 79 {
 80         int err;
 81         unsigned char buf;
 82 
 83         if ((err = snd_i2c_sendbytes(device, &reg, 1)) != 1) {
 84                 snd_printk(KERN_ERR "unable to send register 0x%x byte "
 85                            "to CS8427\n", reg);
 86                 return err < 0 ? err : -EIO;
 87         }
 88         if ((err = snd_i2c_readbytes(device, &buf, 1)) != 1) {
 89                 snd_printk(KERN_ERR "unable to read register 0x%x byte "
 90                            "from CS8427\n", reg);
 91                 return err < 0 ? err : -EIO;
 92         }
 93         return buf;
 94 }
 95 
 96 static int snd_cs8427_select_corudata(struct snd_i2c_device *device, int udata)
 97 {
 98         struct cs8427 *chip = device->private_data;
 99         int err;
100 
101         udata = udata ? CS8427_BSEL : 0;
102         if (udata != (chip->regmap[CS8427_REG_CSDATABUF] & udata)) {
103                 chip->regmap[CS8427_REG_CSDATABUF] &= ~CS8427_BSEL;
104                 chip->regmap[CS8427_REG_CSDATABUF] |= udata;
105                 err = snd_cs8427_reg_write(device, CS8427_REG_CSDATABUF,
106                                            chip->regmap[CS8427_REG_CSDATABUF]);
107                 if (err < 0)
108                         return err;
109         }
110         return 0;
111 }
112 
113 static int snd_cs8427_send_corudata(struct snd_i2c_device *device,
114                                     int udata,
115                                     unsigned char *ndata,
116                                     int count)
117 {
118         struct cs8427 *chip = device->private_data;
119         char *hw_data = udata ?
120                 chip->playback.hw_udata : chip->playback.hw_status;
121         char data[32];
122         int err, idx;
123 
124         if (!memcmp(hw_data, ndata, count))
125                 return 0;
126         if ((err = snd_cs8427_select_corudata(device, udata)) < 0)
127                 return err;
128         memcpy(hw_data, ndata, count);
129         if (udata) {
130                 memset(data, 0, sizeof(data));
131                 if (memcmp(hw_data, data, count) == 0) {
132                         chip->regmap[CS8427_REG_UDATABUF] &= ~CS8427_UBMMASK;
133                         chip->regmap[CS8427_REG_UDATABUF] |= CS8427_UBMZEROS |
134                                 CS8427_EFTUI;
135                         err = snd_cs8427_reg_write(device, CS8427_REG_UDATABUF,
136                                                    chip->regmap[CS8427_REG_UDATABUF]);
137                         return err < 0 ? err : 0;
138                 }
139         }
140         data[0] = CS8427_REG_AUTOINC | CS8427_REG_CORU_DATABUF;
141         for (idx = 0; idx < count; idx++)
142                 data[idx + 1] = bitrev8(ndata[idx]);
143         if (snd_i2c_sendbytes(device, data, count + 1) != count + 1)
144                 return -EIO;
145         return 1;
146 }
147 
148 static void snd_cs8427_free(struct snd_i2c_device *device)
149 {
150         kfree(device->private_data);
151 }
152 
153 int snd_cs8427_init(struct snd_i2c_bus *bus,
154                     struct snd_i2c_device *device)
155 {
156         static unsigned char initvals1[] = {
157           CS8427_REG_CONTROL1 | CS8427_REG_AUTOINC,
158           /* CS8427_REG_CONTROL1: RMCK to OMCK, valid PCM audio, disable mutes,
159              TCBL=output */
160           CS8427_SWCLK | CS8427_TCBLDIR,
161           /* CS8427_REG_CONTROL2: hold last valid audio sample, RMCK=256*Fs,
162              normal stereo operation */
163           0x00,
164           /* CS8427_REG_DATAFLOW: output drivers normal operation, Tx<=serial,
165              Rx=>serial */
166           CS8427_TXDSERIAL | CS8427_SPDAES3RECEIVER,
167           /* CS8427_REG_CLOCKSOURCE: Run off, CMCK=256*Fs,
168              output time base = OMCK, input time base = recovered input clock,
169              recovered input clock source is ILRCK changed to AES3INPUT
170              (workaround, see snd_cs8427_reset) */
171           CS8427_RXDILRCK,
172           /* CS8427_REG_SERIALINPUT: Serial audio input port data format = I2S,
173              24-bit, 64*Fsi */
174           CS8427_SIDEL | CS8427_SILRPOL,
175           /* CS8427_REG_SERIALOUTPUT: Serial audio output port data format
176              = I2S, 24-bit, 64*Fsi */
177           CS8427_SODEL | CS8427_SOLRPOL,
178         };
179         static unsigned char initvals2[] = {
180           CS8427_REG_RECVERRMASK | CS8427_REG_AUTOINC,
181           /* CS8427_REG_RECVERRMASK: unmask the input PLL clock, V, confidence,
182              biphase, parity status bits */
183           /* CS8427_UNLOCK | CS8427_V | CS8427_CONF | CS8427_BIP | CS8427_PAR,*/
184           0xff, /* set everything */
185           /* CS8427_REG_CSDATABUF:
186              Registers 32-55 window to CS buffer
187              Inhibit D->E transfers from overwriting first 5 bytes of CS data.
188              Inhibit D->E transfers (all) of CS data.
189              Allow E->F transfer of CS data.
190              One byte mode; both A/B channels get same written CB data.
191              A channel info is output to chip's EMPH* pin. */
192           CS8427_CBMR | CS8427_DETCI,
193           /* CS8427_REG_UDATABUF:
194              Use internal buffer to transmit User (U) data.
195              Chip's U pin is an output.
196              Transmit all O's for user data.
197              Inhibit D->E transfers.
198              Inhibit E->F transfers. */
199           CS8427_UD | CS8427_EFTUI | CS8427_DETUI,
200         };
201         struct cs8427 *chip = device->private_data;
202         int err;
203         unsigned char buf[24];
204 
205         snd_i2c_lock(bus);
206         err = snd_cs8427_reg_read(device, CS8427_REG_ID_AND_VER);
207         if (err != CS8427_VER8427A) {
208                 /* give second chance */
209                 snd_printk(KERN_WARNING "invalid CS8427 signature 0x%x: "
210                            "let me try again...\n", err);
211                 err = snd_cs8427_reg_read(device, CS8427_REG_ID_AND_VER);
212         }
213         if (err != CS8427_VER8427A) {
214                 snd_i2c_unlock(bus);
215                 snd_printk(KERN_ERR "unable to find CS8427 signature "
216                            "(expected 0x%x, read 0x%x),\n",
217                            CS8427_VER8427A, err);
218                 snd_printk(KERN_ERR "   initialization is not completed\n");
219                 return -EFAULT;
220         }
221         /* turn off run bit while making changes to configuration */
222         err = snd_cs8427_reg_write(device, CS8427_REG_CLOCKSOURCE, 0x00);
223         if (err < 0)
224                 goto __fail;
225         /* send initial values */
226         memcpy(chip->regmap + (initvals1[0] & 0x7f), initvals1 + 1, 6);
227         if ((err = snd_i2c_sendbytes(device, initvals1, 7)) != 7) {
228                 err = err < 0 ? err : -EIO;
229                 goto __fail;
230         }
231         /* Turn off CS8427 interrupt stuff that is not used in hardware */
232         memset(buf, 0, 7);
233         /* from address 9 to 15 */
234         buf[0] = 9;     /* register */
235         if ((err = snd_i2c_sendbytes(device, buf, 7)) != 7)
236                 goto __fail;
237         /* send transfer initialization sequence */
238         memcpy(chip->regmap + (initvals2[0] & 0x7f), initvals2 + 1, 3);
239         if ((err = snd_i2c_sendbytes(device, initvals2, 4)) != 4) {
240                 err = err < 0 ? err : -EIO;
241                 goto __fail;
242         }
243         /* write default channel status bytes */
244         put_unaligned_le32(SNDRV_PCM_DEFAULT_CON_SPDIF, buf);
245         memset(buf + 4, 0, 24 - 4);
246         if (snd_cs8427_send_corudata(device, 0, buf, 24) < 0)
247                 goto __fail;
248         memcpy(chip->playback.def_status, buf, 24);
249         memcpy(chip->playback.pcm_status, buf, 24);
250         snd_i2c_unlock(bus);
251 
252         /* turn on run bit and rock'n'roll */
253         snd_cs8427_reset(device);
254 
255         return 0;
256 
257 __fail:
258         snd_i2c_unlock(bus);
259 
260         return err;
261 }
262 EXPORT_SYMBOL(snd_cs8427_init);
263 
264 int snd_cs8427_create(struct snd_i2c_bus *bus,
265                       unsigned char addr,
266                       unsigned int reset_timeout,
267                       struct snd_i2c_device **r_cs8427)
268 {
269         int err;
270         struct cs8427 *chip;
271         struct snd_i2c_device *device;
272 
273         err = snd_i2c_device_create(bus, "CS8427", CS8427_ADDR | (addr & 7),
274                                     &device);
275         if (err < 0)
276                 return err;
277         chip = device->private_data = kzalloc(sizeof(*chip), GFP_KERNEL);
278         if (chip == NULL) {
279                 snd_i2c_device_free(device);
280                 return -ENOMEM;
281         }
282         device->private_free = snd_cs8427_free;
283 
284         if (reset_timeout < 1)
285                 reset_timeout = 1;
286         chip->reset_timeout = reset_timeout;
287 
288         err = snd_cs8427_init(bus, device);
289         if (err)
290                 goto __fail;
291 
292 #if 0   // it's nice for read tests
293         {
294         char buf[128];
295         int xx;
296         buf[0] = 0x81;
297         snd_i2c_sendbytes(device, buf, 1);
298         snd_i2c_readbytes(device, buf, 127);
299         for (xx = 0; xx < 127; xx++)
300                 printk(KERN_DEBUG "reg[0x%x] = 0x%x\n", xx+1, buf[xx]);
301         }
302 #endif
303         
304         if (r_cs8427)
305                 *r_cs8427 = device;
306         return 0;
307 
308       __fail:
309         snd_i2c_device_free(device);
310         return err < 0 ? err : -EIO;
311 }
312 
313 EXPORT_SYMBOL(snd_cs8427_create);
314 
315 /*
316  * Reset the chip using run bit, also lock PLL using ILRCK and
317  * put back AES3INPUT. This workaround is described in latest
318  * CS8427 datasheet, otherwise TXDSERIAL will not work.
319  */
320 static void snd_cs8427_reset(struct snd_i2c_device *cs8427)
321 {
322         struct cs8427 *chip;
323         unsigned long end_time;
324         int data, aes3input = 0;
325 
326         if (snd_BUG_ON(!cs8427))
327                 return;
328         chip = cs8427->private_data;
329         snd_i2c_lock(cs8427->bus);
330         if ((chip->regmap[CS8427_REG_CLOCKSOURCE] & CS8427_RXDAES3INPUT) ==
331             CS8427_RXDAES3INPUT)  /* AES3 bit is set */
332                 aes3input = 1;
333         chip->regmap[CS8427_REG_CLOCKSOURCE] &= ~(CS8427_RUN | CS8427_RXDMASK);
334         snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE,
335                              chip->regmap[CS8427_REG_CLOCKSOURCE]);
336         udelay(200);
337         chip->regmap[CS8427_REG_CLOCKSOURCE] |= CS8427_RUN | CS8427_RXDILRCK;
338         snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE,
339                              chip->regmap[CS8427_REG_CLOCKSOURCE]);
340         udelay(200);
341         snd_i2c_unlock(cs8427->bus);
342         end_time = jiffies + chip->reset_timeout;
343         while (time_after_eq(end_time, jiffies)) {
344                 snd_i2c_lock(cs8427->bus);
345                 data = snd_cs8427_reg_read(cs8427, CS8427_REG_RECVERRORS);
346                 snd_i2c_unlock(cs8427->bus);
347                 if (!(data & CS8427_UNLOCK))
348                         break;
349                 schedule_timeout_uninterruptible(1);
350         }
351         snd_i2c_lock(cs8427->bus);
352         chip->regmap[CS8427_REG_CLOCKSOURCE] &= ~CS8427_RXDMASK;
353         if (aes3input)
354                 chip->regmap[CS8427_REG_CLOCKSOURCE] |= CS8427_RXDAES3INPUT;
355         snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE,
356                              chip->regmap[CS8427_REG_CLOCKSOURCE]);
357         snd_i2c_unlock(cs8427->bus);
358 }
359 
360 static int snd_cs8427_in_status_info(struct snd_kcontrol *kcontrol,
361                                      struct snd_ctl_elem_info *uinfo)
362 {
363         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
364         uinfo->count = 1;
365         uinfo->value.integer.min = 0;
366         uinfo->value.integer.max = 255;
367         return 0;
368 }
369 
370 static int snd_cs8427_in_status_get(struct snd_kcontrol *kcontrol,
371                                     struct snd_ctl_elem_value *ucontrol)
372 {
373         struct snd_i2c_device *device = snd_kcontrol_chip(kcontrol);
374         int data;
375 
376         snd_i2c_lock(device->bus);
377         data = snd_cs8427_reg_read(device, kcontrol->private_value);
378         snd_i2c_unlock(device->bus);
379         if (data < 0)
380                 return data;
381         ucontrol->value.integer.value[0] = data;
382         return 0;
383 }
384 
385 static int snd_cs8427_qsubcode_info(struct snd_kcontrol *kcontrol,
386                                     struct snd_ctl_elem_info *uinfo)
387 {
388         uinfo->type = SNDRV_CTL_ELEM_TYPE_BYTES;
389         uinfo->count = 10;
390         return 0;
391 }
392 
393 static int snd_cs8427_qsubcode_get(struct snd_kcontrol *kcontrol,
394                                    struct snd_ctl_elem_value *ucontrol)
395 {
396         struct snd_i2c_device *device = snd_kcontrol_chip(kcontrol);
397         unsigned char reg = CS8427_REG_QSUBCODE;
398         int err;
399 
400         snd_i2c_lock(device->bus);
401         if ((err = snd_i2c_sendbytes(device, &reg, 1)) != 1) {
402                 snd_printk(KERN_ERR "unable to send register 0x%x byte "
403                            "to CS8427\n", reg);
404                 snd_i2c_unlock(device->bus);
405                 return err < 0 ? err : -EIO;
406         }
407         err = snd_i2c_readbytes(device, ucontrol->value.bytes.data, 10);
408         if (err != 10) {
409                 snd_printk(KERN_ERR "unable to read Q-subcode bytes "
410                            "from CS8427\n");
411                 snd_i2c_unlock(device->bus);
412                 return err < 0 ? err : -EIO;
413         }
414         snd_i2c_unlock(device->bus);
415         return 0;
416 }
417 
418 static int snd_cs8427_spdif_info(struct snd_kcontrol *kcontrol,
419                                  struct snd_ctl_elem_info *uinfo)
420 {
421         uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
422         uinfo->count = 1;
423         return 0;
424 }
425 
426 static int snd_cs8427_spdif_get(struct snd_kcontrol *kcontrol,
427                                 struct snd_ctl_elem_value *ucontrol)
428 {
429         struct snd_i2c_device *device = snd_kcontrol_chip(kcontrol);
430         struct cs8427 *chip = device->private_data;
431         
432         snd_i2c_lock(device->bus);
433         memcpy(ucontrol->value.iec958.status, chip->playback.def_status, 24);
434         snd_i2c_unlock(device->bus);
435         return 0;
436 }
437 
438 static int snd_cs8427_spdif_put(struct snd_kcontrol *kcontrol,
439                                 struct snd_ctl_elem_value *ucontrol)
440 {
441         struct snd_i2c_device *device = snd_kcontrol_chip(kcontrol);
442         struct cs8427 *chip = device->private_data;
443         unsigned char *status = kcontrol->private_value ?
444                 chip->playback.pcm_status : chip->playback.def_status;
445         struct snd_pcm_runtime *runtime = chip->playback.substream ?
446                 chip->playback.substream->runtime : NULL;
447         int err, change;
448 
449         snd_i2c_lock(device->bus);
450         change = memcmp(ucontrol->value.iec958.status, status, 24) != 0;
451         memcpy(status, ucontrol->value.iec958.status, 24);
452         if (change && (kcontrol->private_value ?
453                        runtime != NULL : runtime == NULL)) {
454                 err = snd_cs8427_send_corudata(device, 0, status, 24);
455                 if (err < 0)
456                         change = err;
457         }
458         snd_i2c_unlock(device->bus);
459         return change;
460 }
461 
462 static int snd_cs8427_spdif_mask_info(struct snd_kcontrol *kcontrol,
463                                       struct snd_ctl_elem_info *uinfo)
464 {
465         uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
466         uinfo->count = 1;
467         return 0;
468 }
469 
470 static int snd_cs8427_spdif_mask_get(struct snd_kcontrol *kcontrol,
471                                       struct snd_ctl_elem_value *ucontrol)
472 {
473         memset(ucontrol->value.iec958.status, 0xff, 24);
474         return 0;
475 }
476 
477 static struct snd_kcontrol_new snd_cs8427_iec958_controls[] = {
478 {
479         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
480         .info =         snd_cs8427_in_status_info,
481         .name =         "IEC958 CS8427 Input Status",
482         .access =       (SNDRV_CTL_ELEM_ACCESS_READ |
483                          SNDRV_CTL_ELEM_ACCESS_VOLATILE),
484         .get =          snd_cs8427_in_status_get,
485         .private_value = 15,
486 },
487 {
488         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
489         .info =         snd_cs8427_in_status_info,
490         .name =         "IEC958 CS8427 Error Status",
491         .access =       (SNDRV_CTL_ELEM_ACCESS_READ |
492                          SNDRV_CTL_ELEM_ACCESS_VOLATILE),
493         .get =          snd_cs8427_in_status_get,
494         .private_value = 16,
495 },
496 {
497         .access =       SNDRV_CTL_ELEM_ACCESS_READ,
498         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
499         .name =         SNDRV_CTL_NAME_IEC958("",PLAYBACK,MASK),
500         .info =         snd_cs8427_spdif_mask_info,
501         .get =          snd_cs8427_spdif_mask_get,
502 },
503 {
504         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
505         .name =         SNDRV_CTL_NAME_IEC958("",PLAYBACK,DEFAULT),
506         .info =         snd_cs8427_spdif_info,
507         .get =          snd_cs8427_spdif_get,
508         .put =          snd_cs8427_spdif_put,
509         .private_value = 0
510 },
511 {
512         .access =       (SNDRV_CTL_ELEM_ACCESS_READWRITE |
513                          SNDRV_CTL_ELEM_ACCESS_INACTIVE),
514         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
515         .name =         SNDRV_CTL_NAME_IEC958("",PLAYBACK,PCM_STREAM),
516         .info =         snd_cs8427_spdif_info,
517         .get =          snd_cs8427_spdif_get,
518         .put =          snd_cs8427_spdif_put,
519         .private_value = 1
520 },
521 {
522         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
523         .info =         snd_cs8427_qsubcode_info,
524         .name =         "IEC958 Q-subcode Capture Default",
525         .access =       (SNDRV_CTL_ELEM_ACCESS_READ |
526                          SNDRV_CTL_ELEM_ACCESS_VOLATILE),
527         .get =          snd_cs8427_qsubcode_get
528 }};
529 
530 int snd_cs8427_iec958_build(struct snd_i2c_device *cs8427,
531                             struct snd_pcm_substream *play_substream,
532                             struct snd_pcm_substream *cap_substream)
533 {
534         struct cs8427 *chip = cs8427->private_data;
535         struct snd_kcontrol *kctl;
536         unsigned int idx;
537         int err;
538 
539         if (snd_BUG_ON(!play_substream || !cap_substream))
540                 return -EINVAL;
541         for (idx = 0; idx < ARRAY_SIZE(snd_cs8427_iec958_controls); idx++) {
542                 kctl = snd_ctl_new1(&snd_cs8427_iec958_controls[idx], cs8427);
543                 if (kctl == NULL)
544                         return -ENOMEM;
545                 kctl->id.device = play_substream->pcm->device;
546                 kctl->id.subdevice = play_substream->number;
547                 err = snd_ctl_add(cs8427->bus->card, kctl);
548                 if (err < 0)
549                         return err;
550                 if (! strcmp(kctl->id.name,
551                              SNDRV_CTL_NAME_IEC958("",PLAYBACK,PCM_STREAM)))
552                         chip->playback.pcm_ctl = kctl;
553         }
554 
555         chip->playback.substream = play_substream;
556         chip->capture.substream = cap_substream;
557         if (snd_BUG_ON(!chip->playback.pcm_ctl))
558                 return -EIO;
559         return 0;
560 }
561 
562 EXPORT_SYMBOL(snd_cs8427_iec958_build);
563 
564 int snd_cs8427_iec958_active(struct snd_i2c_device *cs8427, int active)
565 {
566         struct cs8427 *chip;
567 
568         if (snd_BUG_ON(!cs8427))
569                 return -ENXIO;
570         chip = cs8427->private_data;
571         if (active)
572                 memcpy(chip->playback.pcm_status,
573                        chip->playback.def_status, 24);
574         chip->playback.pcm_ctl->vd[0].access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
575         snd_ctl_notify(cs8427->bus->card,
576                        SNDRV_CTL_EVENT_MASK_VALUE | SNDRV_CTL_EVENT_MASK_INFO,
577                        &chip->playback.pcm_ctl->id);
578         return 0;
579 }
580 
581 EXPORT_SYMBOL(snd_cs8427_iec958_active);
582 
583 int snd_cs8427_iec958_pcm(struct snd_i2c_device *cs8427, unsigned int rate)
584 {
585         struct cs8427 *chip;
586         char *status;
587         int err, reset;
588 
589         if (snd_BUG_ON(!cs8427))
590                 return -ENXIO;
591         chip = cs8427->private_data;
592         status = chip->playback.pcm_status;
593         snd_i2c_lock(cs8427->bus);
594         if (status[0] & IEC958_AES0_PROFESSIONAL) {
595                 status[0] &= ~IEC958_AES0_PRO_FS;
596                 switch (rate) {
597                 case 32000: status[0] |= IEC958_AES0_PRO_FS_32000; break;
598                 case 44100: status[0] |= IEC958_AES0_PRO_FS_44100; break;
599                 case 48000: status[0] |= IEC958_AES0_PRO_FS_48000; break;
600                 default: status[0] |= IEC958_AES0_PRO_FS_NOTID; break;
601                 }
602         } else {
603                 status[3] &= ~IEC958_AES3_CON_FS;
604                 switch (rate) {
605                 case 32000: status[3] |= IEC958_AES3_CON_FS_32000; break;
606                 case 44100: status[3] |= IEC958_AES3_CON_FS_44100; break;
607                 case 48000: status[3] |= IEC958_AES3_CON_FS_48000; break;
608                 }
609         }
610         err = snd_cs8427_send_corudata(cs8427, 0, status, 24);
611         if (err > 0)
612                 snd_ctl_notify(cs8427->bus->card,
613                                SNDRV_CTL_EVENT_MASK_VALUE,
614                                &chip->playback.pcm_ctl->id);
615         reset = chip->rate != rate;
616         chip->rate = rate;
617         snd_i2c_unlock(cs8427->bus);
618         if (reset)
619                 snd_cs8427_reset(cs8427);
620         return err < 0 ? err : 0;
621 }
622 
623 EXPORT_SYMBOL(snd_cs8427_iec958_pcm);
624 
625 static int __init alsa_cs8427_module_init(void)
626 {
627         return 0;
628 }
629 
630 static void __exit alsa_cs8427_module_exit(void)
631 {
632 }
633 
634 module_init(alsa_cs8427_module_init)
635 module_exit(alsa_cs8427_module_exit)
636 

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