xref: /openbmc/linux/sound/i2c/cs8427.c (revision e868d61272caa648214046a096e5a6bfc068dc8c)
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 		snd_i2c_unlock(bus);
233 		snd_printk(KERN_ERR "unable to find CS8427 signature "
234 			   "(expected 0x%x, read 0x%x),\n",
235 			   CS8427_VER8427A, err);
236 		snd_printk(KERN_ERR "   initialization is not completed\n");
237 		return -EFAULT;
238 	}
239 	/* turn off run bit while making changes to configuration */
240 	err = snd_cs8427_reg_write(device, CS8427_REG_CLOCKSOURCE, 0x00);
241 	if (err < 0)
242 		goto __fail;
243 	/* send initial values */
244 	memcpy(chip->regmap + (initvals1[0] & 0x7f), initvals1 + 1, 6);
245 	if ((err = snd_i2c_sendbytes(device, initvals1, 7)) != 7) {
246 		err = err < 0 ? err : -EIO;
247 		goto __fail;
248 	}
249 	/* Turn off CS8427 interrupt stuff that is not used in hardware */
250 	memset(buf, 0, 7);
251 	/* from address 9 to 15 */
252 	buf[0] = 9;	/* register */
253 	if ((err = snd_i2c_sendbytes(device, buf, 7)) != 7)
254 		goto __fail;
255 	/* send transfer initialization sequence */
256 	memcpy(chip->regmap + (initvals2[0] & 0x7f), initvals2 + 1, 3);
257 	if ((err = snd_i2c_sendbytes(device, initvals2, 4)) != 4) {
258 		err = err < 0 ? err : -EIO;
259 		goto __fail;
260 	}
261 	/* write default channel status bytes */
262 	buf[0] = ((unsigned char)(SNDRV_PCM_DEFAULT_CON_SPDIF >> 0));
263 	buf[1] = ((unsigned char)(SNDRV_PCM_DEFAULT_CON_SPDIF >> 8));
264 	buf[2] = ((unsigned char)(SNDRV_PCM_DEFAULT_CON_SPDIF >> 16));
265 	buf[3] = ((unsigned char)(SNDRV_PCM_DEFAULT_CON_SPDIF >> 24));
266 	memset(buf + 4, 0, 24 - 4);
267 	if (snd_cs8427_send_corudata(device, 0, buf, 24) < 0)
268 		goto __fail;
269 	memcpy(chip->playback.def_status, buf, 24);
270 	memcpy(chip->playback.pcm_status, buf, 24);
271 	snd_i2c_unlock(bus);
272 
273 	/* turn on run bit and rock'n'roll */
274 	if (reset_timeout < 1)
275 		reset_timeout = 1;
276 	chip->reset_timeout = reset_timeout;
277 	snd_cs8427_reset(device);
278 
279 #if 0	// it's nice for read tests
280 	{
281 	char buf[128];
282 	int xx;
283 	buf[0] = 0x81;
284 	snd_i2c_sendbytes(device, buf, 1);
285 	snd_i2c_readbytes(device, buf, 127);
286 	for (xx = 0; xx < 127; xx++)
287 		printk(KERN_DEBUG "reg[0x%x] = 0x%x\n", xx+1, buf[xx]);
288 	}
289 #endif
290 
291 	if (r_cs8427)
292 		*r_cs8427 = device;
293 	return 0;
294 
295       __fail:
296       	snd_i2c_unlock(bus);
297       	snd_i2c_device_free(device);
298       	return err < 0 ? err : -EIO;
299 }
300 
301 EXPORT_SYMBOL(snd_cs8427_create);
302 
303 /*
304  * Reset the chip using run bit, also lock PLL using ILRCK and
305  * put back AES3INPUT. This workaround is described in latest
306  * CS8427 datasheet, otherwise TXDSERIAL will not work.
307  */
308 static void snd_cs8427_reset(struct snd_i2c_device *cs8427)
309 {
310 	struct cs8427 *chip;
311 	unsigned long end_time;
312 	int data, aes3input = 0;
313 
314 	snd_assert(cs8427, return);
315 	chip = cs8427->private_data;
316 	snd_i2c_lock(cs8427->bus);
317 	if ((chip->regmap[CS8427_REG_CLOCKSOURCE] & CS8427_RXDAES3INPUT) ==
318 	    CS8427_RXDAES3INPUT)  /* AES3 bit is set */
319 		aes3input = 1;
320 	chip->regmap[CS8427_REG_CLOCKSOURCE] &= ~(CS8427_RUN | CS8427_RXDMASK);
321 	snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE,
322 			     chip->regmap[CS8427_REG_CLOCKSOURCE]);
323 	udelay(200);
324 	chip->regmap[CS8427_REG_CLOCKSOURCE] |= CS8427_RUN | CS8427_RXDILRCK;
325 	snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE,
326 			     chip->regmap[CS8427_REG_CLOCKSOURCE]);
327 	udelay(200);
328 	snd_i2c_unlock(cs8427->bus);
329 	end_time = jiffies + chip->reset_timeout;
330 	while (time_after_eq(end_time, jiffies)) {
331 		snd_i2c_lock(cs8427->bus);
332 		data = snd_cs8427_reg_read(cs8427, CS8427_REG_RECVERRORS);
333 		snd_i2c_unlock(cs8427->bus);
334 		if (!(data & CS8427_UNLOCK))
335 			break;
336 		schedule_timeout_uninterruptible(1);
337 	}
338 	snd_i2c_lock(cs8427->bus);
339 	chip->regmap[CS8427_REG_CLOCKSOURCE] &= ~CS8427_RXDMASK;
340 	if (aes3input)
341 		chip->regmap[CS8427_REG_CLOCKSOURCE] |= CS8427_RXDAES3INPUT;
342 	snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE,
343 			     chip->regmap[CS8427_REG_CLOCKSOURCE]);
344 	snd_i2c_unlock(cs8427->bus);
345 }
346 
347 static int snd_cs8427_in_status_info(struct snd_kcontrol *kcontrol,
348 				     struct snd_ctl_elem_info *uinfo)
349 {
350 	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
351 	uinfo->count = 1;
352 	uinfo->value.integer.min = 0;
353 	uinfo->value.integer.max = 255;
354 	return 0;
355 }
356 
357 static int snd_cs8427_in_status_get(struct snd_kcontrol *kcontrol,
358 				    struct snd_ctl_elem_value *ucontrol)
359 {
360 	struct snd_i2c_device *device = snd_kcontrol_chip(kcontrol);
361 	int data;
362 
363 	snd_i2c_lock(device->bus);
364 	data = snd_cs8427_reg_read(device, kcontrol->private_value);
365 	snd_i2c_unlock(device->bus);
366 	if (data < 0)
367 		return data;
368 	ucontrol->value.integer.value[0] = data;
369 	return 0;
370 }
371 
372 static int snd_cs8427_qsubcode_info(struct snd_kcontrol *kcontrol,
373 				    struct snd_ctl_elem_info *uinfo)
374 {
375 	uinfo->type = SNDRV_CTL_ELEM_TYPE_BYTES;
376 	uinfo->count = 10;
377 	return 0;
378 }
379 
380 static int snd_cs8427_qsubcode_get(struct snd_kcontrol *kcontrol,
381 				   struct snd_ctl_elem_value *ucontrol)
382 {
383 	struct snd_i2c_device *device = snd_kcontrol_chip(kcontrol);
384 	unsigned char reg = CS8427_REG_QSUBCODE;
385 	int err;
386 
387 	snd_i2c_lock(device->bus);
388 	if ((err = snd_i2c_sendbytes(device, &reg, 1)) != 1) {
389 		snd_printk(KERN_ERR "unable to send register 0x%x byte "
390 			   "to CS8427\n", reg);
391 		snd_i2c_unlock(device->bus);
392 		return err < 0 ? err : -EIO;
393 	}
394 	err = snd_i2c_readbytes(device, ucontrol->value.bytes.data, 10);
395 	if (err != 10) {
396 		snd_printk(KERN_ERR "unable to read Q-subcode bytes "
397 			   "from CS8427\n");
398 		snd_i2c_unlock(device->bus);
399 		return err < 0 ? err : -EIO;
400 	}
401 	snd_i2c_unlock(device->bus);
402 	return 0;
403 }
404 
405 static int snd_cs8427_spdif_info(struct snd_kcontrol *kcontrol,
406 				 struct snd_ctl_elem_info *uinfo)
407 {
408 	uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
409 	uinfo->count = 1;
410 	return 0;
411 }
412 
413 static int snd_cs8427_spdif_get(struct snd_kcontrol *kcontrol,
414 				struct snd_ctl_elem_value *ucontrol)
415 {
416 	struct snd_i2c_device *device = snd_kcontrol_chip(kcontrol);
417 	struct cs8427 *chip = device->private_data;
418 
419 	snd_i2c_lock(device->bus);
420 	memcpy(ucontrol->value.iec958.status, chip->playback.def_status, 24);
421 	snd_i2c_unlock(device->bus);
422 	return 0;
423 }
424 
425 static int snd_cs8427_spdif_put(struct snd_kcontrol *kcontrol,
426 				struct snd_ctl_elem_value *ucontrol)
427 {
428 	struct snd_i2c_device *device = snd_kcontrol_chip(kcontrol);
429 	struct cs8427 *chip = device->private_data;
430 	unsigned char *status = kcontrol->private_value ?
431 		chip->playback.pcm_status : chip->playback.def_status;
432 	struct snd_pcm_runtime *runtime = chip->playback.substream ?
433 		chip->playback.substream->runtime : NULL;
434 	int err, change;
435 
436 	snd_i2c_lock(device->bus);
437 	change = memcmp(ucontrol->value.iec958.status, status, 24) != 0;
438 	memcpy(status, ucontrol->value.iec958.status, 24);
439 	if (change && (kcontrol->private_value ?
440 		       runtime != NULL : runtime == NULL)) {
441 		err = snd_cs8427_send_corudata(device, 0, status, 24);
442 		if (err < 0)
443 			change = err;
444 	}
445 	snd_i2c_unlock(device->bus);
446 	return change;
447 }
448 
449 static int snd_cs8427_spdif_mask_info(struct snd_kcontrol *kcontrol,
450 				      struct snd_ctl_elem_info *uinfo)
451 {
452 	uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
453 	uinfo->count = 1;
454 	return 0;
455 }
456 
457 static int snd_cs8427_spdif_mask_get(struct snd_kcontrol *kcontrol,
458 				      struct snd_ctl_elem_value *ucontrol)
459 {
460 	memset(ucontrol->value.iec958.status, 0xff, 24);
461 	return 0;
462 }
463 
464 static struct snd_kcontrol_new snd_cs8427_iec958_controls[] = {
465 {
466 	.iface =	SNDRV_CTL_ELEM_IFACE_PCM,
467 	.info =		snd_cs8427_in_status_info,
468 	.name =		"IEC958 CS8427 Input Status",
469 	.access =	(SNDRV_CTL_ELEM_ACCESS_READ |
470 			 SNDRV_CTL_ELEM_ACCESS_VOLATILE),
471 	.get =		snd_cs8427_in_status_get,
472 	.private_value = 15,
473 },
474 {
475 	.iface =	SNDRV_CTL_ELEM_IFACE_PCM,
476 	.info =		snd_cs8427_in_status_info,
477 	.name =		"IEC958 CS8427 Error Status",
478 	.access =	(SNDRV_CTL_ELEM_ACCESS_READ |
479 			 SNDRV_CTL_ELEM_ACCESS_VOLATILE),
480 	.get =		snd_cs8427_in_status_get,
481 	.private_value = 16,
482 },
483 {
484 	.access =	SNDRV_CTL_ELEM_ACCESS_READ,
485 	.iface =	SNDRV_CTL_ELEM_IFACE_PCM,
486 	.name =		SNDRV_CTL_NAME_IEC958("",PLAYBACK,MASK),
487 	.info =		snd_cs8427_spdif_mask_info,
488 	.get =		snd_cs8427_spdif_mask_get,
489 },
490 {
491 	.iface =	SNDRV_CTL_ELEM_IFACE_PCM,
492 	.name =		SNDRV_CTL_NAME_IEC958("",PLAYBACK,DEFAULT),
493 	.info =		snd_cs8427_spdif_info,
494 	.get =		snd_cs8427_spdif_get,
495 	.put =		snd_cs8427_spdif_put,
496 	.private_value = 0
497 },
498 {
499 	.access =	(SNDRV_CTL_ELEM_ACCESS_READWRITE |
500 			 SNDRV_CTL_ELEM_ACCESS_INACTIVE),
501 	.iface =	SNDRV_CTL_ELEM_IFACE_PCM,
502 	.name =		SNDRV_CTL_NAME_IEC958("",PLAYBACK,PCM_STREAM),
503 	.info =		snd_cs8427_spdif_info,
504 	.get =		snd_cs8427_spdif_get,
505 	.put =		snd_cs8427_spdif_put,
506 	.private_value = 1
507 },
508 {
509 	.iface =	SNDRV_CTL_ELEM_IFACE_PCM,
510 	.info =		snd_cs8427_qsubcode_info,
511 	.name =		"IEC958 Q-subcode Capture Default",
512 	.access =	(SNDRV_CTL_ELEM_ACCESS_READ |
513 			 SNDRV_CTL_ELEM_ACCESS_VOLATILE),
514 	.get =		snd_cs8427_qsubcode_get
515 }};
516 
517 int snd_cs8427_iec958_build(struct snd_i2c_device *cs8427,
518 			    struct snd_pcm_substream *play_substream,
519 			    struct snd_pcm_substream *cap_substream)
520 {
521 	struct cs8427 *chip = cs8427->private_data;
522 	struct snd_kcontrol *kctl;
523 	unsigned int idx;
524 	int err;
525 
526 	snd_assert(play_substream && cap_substream, return -EINVAL);
527 	for (idx = 0; idx < ARRAY_SIZE(snd_cs8427_iec958_controls); idx++) {
528 		kctl = snd_ctl_new1(&snd_cs8427_iec958_controls[idx], cs8427);
529 		if (kctl == NULL)
530 			return -ENOMEM;
531 		kctl->id.device = play_substream->pcm->device;
532 		kctl->id.subdevice = play_substream->number;
533 		err = snd_ctl_add(cs8427->bus->card, kctl);
534 		if (err < 0)
535 			return err;
536 		if (! strcmp(kctl->id.name,
537 			     SNDRV_CTL_NAME_IEC958("",PLAYBACK,PCM_STREAM)))
538 			chip->playback.pcm_ctl = kctl;
539 	}
540 
541 	chip->playback.substream = play_substream;
542 	chip->capture.substream = cap_substream;
543 	snd_assert(chip->playback.pcm_ctl, return -EIO);
544 	return 0;
545 }
546 
547 EXPORT_SYMBOL(snd_cs8427_iec958_build);
548 
549 int snd_cs8427_iec958_active(struct snd_i2c_device *cs8427, int active)
550 {
551 	struct cs8427 *chip;
552 
553 	snd_assert(cs8427, return -ENXIO);
554 	chip = cs8427->private_data;
555 	if (active)
556 		memcpy(chip->playback.pcm_status,
557 		       chip->playback.def_status, 24);
558 	chip->playback.pcm_ctl->vd[0].access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
559 	snd_ctl_notify(cs8427->bus->card,
560 		       SNDRV_CTL_EVENT_MASK_VALUE | SNDRV_CTL_EVENT_MASK_INFO,
561 		       &chip->playback.pcm_ctl->id);
562 	return 0;
563 }
564 
565 EXPORT_SYMBOL(snd_cs8427_iec958_active);
566 
567 int snd_cs8427_iec958_pcm(struct snd_i2c_device *cs8427, unsigned int rate)
568 {
569 	struct cs8427 *chip;
570 	char *status;
571 	int err, reset;
572 
573 	snd_assert(cs8427, return -ENXIO);
574 	chip = cs8427->private_data;
575 	status = chip->playback.pcm_status;
576 	snd_i2c_lock(cs8427->bus);
577 	if (status[0] & IEC958_AES0_PROFESSIONAL) {
578 		status[0] &= ~IEC958_AES0_PRO_FS;
579 		switch (rate) {
580 		case 32000: status[0] |= IEC958_AES0_PRO_FS_32000; break;
581 		case 44100: status[0] |= IEC958_AES0_PRO_FS_44100; break;
582 		case 48000: status[0] |= IEC958_AES0_PRO_FS_48000; break;
583 		default: status[0] |= IEC958_AES0_PRO_FS_NOTID; break;
584 		}
585 	} else {
586 		status[3] &= ~IEC958_AES3_CON_FS;
587 		switch (rate) {
588 		case 32000: status[3] |= IEC958_AES3_CON_FS_32000; break;
589 		case 44100: status[3] |= IEC958_AES3_CON_FS_44100; break;
590 		case 48000: status[3] |= IEC958_AES3_CON_FS_48000; break;
591 		}
592 	}
593 	err = snd_cs8427_send_corudata(cs8427, 0, status, 24);
594 	if (err > 0)
595 		snd_ctl_notify(cs8427->bus->card,
596 			       SNDRV_CTL_EVENT_MASK_VALUE,
597 			       &chip->playback.pcm_ctl->id);
598 	reset = chip->rate != rate;
599 	chip->rate = rate;
600 	snd_i2c_unlock(cs8427->bus);
601 	if (reset)
602 		snd_cs8427_reset(cs8427);
603 	return err < 0 ? err : 0;
604 }
605 
606 EXPORT_SYMBOL(snd_cs8427_iec958_pcm);
607 
608 static int __init alsa_cs8427_module_init(void)
609 {
610 	return 0;
611 }
612 
613 static void __exit alsa_cs8427_module_exit(void)
614 {
615 }
616 
617 module_init(alsa_cs8427_module_init)
618 module_exit(alsa_cs8427_module_exit)
619