1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *  Routines for control of the CS8427 via i2c bus
4  *  IEC958 (S/PDIF) receiver & transmitter by Cirrus Logic
5  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
6  */
7 
8 #include <linux/slab.h>
9 #include <linux/delay.h>
10 #include <linux/init.h>
11 #include <linux/bitrev.h>
12 #include <linux/module.h>
13 #include <asm/unaligned.h>
14 #include <sound/core.h>
15 #include <sound/control.h>
16 #include <sound/pcm.h>
17 #include <sound/cs8427.h>
18 #include <sound/asoundef.h>
19 
20 static void snd_cs8427_reset(struct snd_i2c_device *cs8427);
21 
22 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
23 MODULE_DESCRIPTION("IEC958 (S/PDIF) receiver & transmitter by Cirrus Logic");
24 MODULE_LICENSE("GPL");
25 
26 #define CS8427_ADDR			(0x20>>1) /* fixed address */
27 
28 struct cs8427_stream {
29 	struct snd_pcm_substream *substream;
30 	char hw_status[24];		/* hardware status */
31 	char def_status[24];		/* default status */
32 	char pcm_status[24];		/* PCM private status */
33 	char hw_udata[32];
34 	struct snd_kcontrol *pcm_ctl;
35 };
36 
37 struct cs8427 {
38 	unsigned char regmap[0x14];	/* map of first 1 + 13 registers */
39 	unsigned int rate;
40 	unsigned int reset_timeout;
41 	struct cs8427_stream playback;
42 	struct cs8427_stream capture;
43 };
44 
snd_cs8427_reg_write(struct snd_i2c_device * device,unsigned char reg,unsigned char val)45 int snd_cs8427_reg_write(struct snd_i2c_device *device, unsigned char reg,
46 			 unsigned char val)
47 {
48 	int err;
49 	unsigned char buf[2];
50 
51 	buf[0] = reg & 0x7f;
52 	buf[1] = val;
53 	err = snd_i2c_sendbytes(device, buf, 2);
54 	if (err != 2) {
55 		snd_printk(KERN_ERR "unable to send bytes 0x%02x:0x%02x "
56 			   "to CS8427 (%i)\n", buf[0], buf[1], err);
57 		return err < 0 ? err : -EIO;
58 	}
59 	return 0;
60 }
61 
62 EXPORT_SYMBOL(snd_cs8427_reg_write);
63 
snd_cs8427_reg_read(struct snd_i2c_device * device,unsigned char reg)64 static int snd_cs8427_reg_read(struct snd_i2c_device *device, unsigned char reg)
65 {
66 	int err;
67 	unsigned char buf;
68 
69 	err = snd_i2c_sendbytes(device, &reg, 1);
70 	if (err != 1) {
71 		snd_printk(KERN_ERR "unable to send register 0x%x byte "
72 			   "to CS8427\n", reg);
73 		return err < 0 ? err : -EIO;
74 	}
75 	err = snd_i2c_readbytes(device, &buf, 1);
76 	if (err != 1) {
77 		snd_printk(KERN_ERR "unable to read register 0x%x byte "
78 			   "from CS8427\n", reg);
79 		return err < 0 ? err : -EIO;
80 	}
81 	return buf;
82 }
83 
snd_cs8427_select_corudata(struct snd_i2c_device * device,int udata)84 static int snd_cs8427_select_corudata(struct snd_i2c_device *device, int udata)
85 {
86 	struct cs8427 *chip = device->private_data;
87 	int err;
88 
89 	udata = udata ? CS8427_BSEL : 0;
90 	if (udata != (chip->regmap[CS8427_REG_CSDATABUF] & udata)) {
91 		chip->regmap[CS8427_REG_CSDATABUF] &= ~CS8427_BSEL;
92 		chip->regmap[CS8427_REG_CSDATABUF] |= udata;
93 		err = snd_cs8427_reg_write(device, CS8427_REG_CSDATABUF,
94 					   chip->regmap[CS8427_REG_CSDATABUF]);
95 		if (err < 0)
96 			return err;
97 	}
98 	return 0;
99 }
100 
snd_cs8427_send_corudata(struct snd_i2c_device * device,int udata,unsigned char * ndata,int count)101 static int snd_cs8427_send_corudata(struct snd_i2c_device *device,
102 				    int udata,
103 				    unsigned char *ndata,
104 				    int count)
105 {
106 	struct cs8427 *chip = device->private_data;
107 	char *hw_data = udata ?
108 		chip->playback.hw_udata : chip->playback.hw_status;
109 	unsigned char data[32];
110 	int err, idx;
111 
112 	if (!memcmp(hw_data, ndata, count))
113 		return 0;
114 	err = snd_cs8427_select_corudata(device, udata);
115 	if (err < 0)
116 		return err;
117 	memcpy(hw_data, ndata, count);
118 	if (udata) {
119 		memset(data, 0, sizeof(data));
120 		if (memcmp(hw_data, data, count) == 0) {
121 			chip->regmap[CS8427_REG_UDATABUF] &= ~CS8427_UBMMASK;
122 			chip->regmap[CS8427_REG_UDATABUF] |= CS8427_UBMZEROS |
123 				CS8427_EFTUI;
124 			err = snd_cs8427_reg_write(device, CS8427_REG_UDATABUF,
125 						   chip->regmap[CS8427_REG_UDATABUF]);
126 			return err < 0 ? err : 0;
127 		}
128 	}
129 	data[0] = CS8427_REG_AUTOINC | CS8427_REG_CORU_DATABUF;
130 	for (idx = 0; idx < count; idx++)
131 		data[idx + 1] = bitrev8(ndata[idx]);
132 	if (snd_i2c_sendbytes(device, data, count + 1) != count + 1)
133 		return -EIO;
134 	return 1;
135 }
136 
snd_cs8427_free(struct snd_i2c_device * device)137 static void snd_cs8427_free(struct snd_i2c_device *device)
138 {
139 	kfree(device->private_data);
140 }
141 
snd_cs8427_init(struct snd_i2c_bus * bus,struct snd_i2c_device * device)142 int snd_cs8427_init(struct snd_i2c_bus *bus,
143 		    struct snd_i2c_device *device)
144 {
145 	static unsigned char initvals1[] = {
146 	  CS8427_REG_CONTROL1 | CS8427_REG_AUTOINC,
147 	  /* CS8427_REG_CONTROL1: RMCK to OMCK, valid PCM audio, disable mutes,
148 	     TCBL=output */
149 	  CS8427_SWCLK | CS8427_TCBLDIR,
150 	  /* CS8427_REG_CONTROL2: hold last valid audio sample, RMCK=256*Fs,
151 	     normal stereo operation */
152 	  0x00,
153 	  /* CS8427_REG_DATAFLOW: output drivers normal operation, Tx<=serial,
154 	     Rx=>serial */
155 	  CS8427_TXDSERIAL | CS8427_SPDAES3RECEIVER,
156 	  /* CS8427_REG_CLOCKSOURCE: Run off, CMCK=256*Fs,
157 	     output time base = OMCK, input time base = recovered input clock,
158 	     recovered input clock source is ILRCK changed to AES3INPUT
159 	     (workaround, see snd_cs8427_reset) */
160 	  CS8427_RXDILRCK,
161 	  /* CS8427_REG_SERIALINPUT: Serial audio input port data format = I2S,
162 	     24-bit, 64*Fsi */
163 	  CS8427_SIDEL | CS8427_SILRPOL,
164 	  /* CS8427_REG_SERIALOUTPUT: Serial audio output port data format
165 	     = I2S, 24-bit, 64*Fsi */
166 	  CS8427_SODEL | CS8427_SOLRPOL,
167 	};
168 	static unsigned char initvals2[] = {
169 	  CS8427_REG_RECVERRMASK | CS8427_REG_AUTOINC,
170 	  /* CS8427_REG_RECVERRMASK: unmask the input PLL clock, V, confidence,
171 	     biphase, parity status bits */
172 	  /* CS8427_UNLOCK | CS8427_V | CS8427_CONF | CS8427_BIP | CS8427_PAR,*/
173 	  0xff, /* set everything */
174 	  /* CS8427_REG_CSDATABUF:
175 	     Registers 32-55 window to CS buffer
176 	     Inhibit D->E transfers from overwriting first 5 bytes of CS data.
177 	     Inhibit D->E transfers (all) of CS data.
178 	     Allow E->F transfer of CS data.
179 	     One byte mode; both A/B channels get same written CB data.
180 	     A channel info is output to chip's EMPH* pin. */
181 	  CS8427_CBMR | CS8427_DETCI,
182 	  /* CS8427_REG_UDATABUF:
183 	     Use internal buffer to transmit User (U) data.
184 	     Chip's U pin is an output.
185 	     Transmit all O's for user data.
186 	     Inhibit D->E transfers.
187 	     Inhibit E->F transfers. */
188 	  CS8427_UD | CS8427_EFTUI | CS8427_DETUI,
189 	};
190 	struct cs8427 *chip = device->private_data;
191 	int err;
192 	unsigned char buf[24];
193 
194 	snd_i2c_lock(bus);
195 	err = snd_cs8427_reg_read(device, CS8427_REG_ID_AND_VER);
196 	if (err != CS8427_VER8427A) {
197 		/* give second chance */
198 		snd_printk(KERN_WARNING "invalid CS8427 signature 0x%x: "
199 			   "let me try again...\n", err);
200 		err = snd_cs8427_reg_read(device, CS8427_REG_ID_AND_VER);
201 	}
202 	if (err != CS8427_VER8427A) {
203 		snd_i2c_unlock(bus);
204 		snd_printk(KERN_ERR "unable to find CS8427 signature "
205 			   "(expected 0x%x, read 0x%x),\n",
206 			   CS8427_VER8427A, err);
207 		snd_printk(KERN_ERR "   initialization is not completed\n");
208 		return -EFAULT;
209 	}
210 	/* turn off run bit while making changes to configuration */
211 	err = snd_cs8427_reg_write(device, CS8427_REG_CLOCKSOURCE, 0x00);
212 	if (err < 0)
213 		goto __fail;
214 	/* send initial values */
215 	memcpy(chip->regmap + (initvals1[0] & 0x7f), initvals1 + 1, 6);
216 	err = snd_i2c_sendbytes(device, initvals1, 7);
217 	if (err != 7) {
218 		err = err < 0 ? err : -EIO;
219 		goto __fail;
220 	}
221 	/* Turn off CS8427 interrupt stuff that is not used in hardware */
222 	memset(buf, 0, 7);
223 	/* from address 9 to 15 */
224 	buf[0] = 9;	/* register */
225 	err = snd_i2c_sendbytes(device, buf, 7);
226 	if (err != 7)
227 		goto __fail;
228 	/* send transfer initialization sequence */
229 	memcpy(chip->regmap + (initvals2[0] & 0x7f), initvals2 + 1, 3);
230 	err = snd_i2c_sendbytes(device, initvals2, 4);
231 	if (err != 4) {
232 		err = err < 0 ? err : -EIO;
233 		goto __fail;
234 	}
235 	/* write default channel status bytes */
236 	put_unaligned_le32(SNDRV_PCM_DEFAULT_CON_SPDIF, buf);
237 	memset(buf + 4, 0, 24 - 4);
238 	if (snd_cs8427_send_corudata(device, 0, buf, 24) < 0)
239 		goto __fail;
240 	memcpy(chip->playback.def_status, buf, 24);
241 	memcpy(chip->playback.pcm_status, buf, 24);
242 	snd_i2c_unlock(bus);
243 
244 	/* turn on run bit and rock'n'roll */
245 	snd_cs8427_reset(device);
246 
247 	return 0;
248 
249 __fail:
250 	snd_i2c_unlock(bus);
251 
252 	return err;
253 }
254 EXPORT_SYMBOL(snd_cs8427_init);
255 
snd_cs8427_create(struct snd_i2c_bus * bus,unsigned char addr,unsigned int reset_timeout,struct snd_i2c_device ** r_cs8427)256 int snd_cs8427_create(struct snd_i2c_bus *bus,
257 		      unsigned char addr,
258 		      unsigned int reset_timeout,
259 		      struct snd_i2c_device **r_cs8427)
260 {
261 	int err;
262 	struct cs8427 *chip;
263 	struct snd_i2c_device *device;
264 
265 	err = snd_i2c_device_create(bus, "CS8427", CS8427_ADDR | (addr & 7),
266 				    &device);
267 	if (err < 0)
268 		return err;
269 	chip = device->private_data = kzalloc(sizeof(*chip), GFP_KERNEL);
270 	if (chip == NULL) {
271 		snd_i2c_device_free(device);
272 		return -ENOMEM;
273 	}
274 	device->private_free = snd_cs8427_free;
275 
276 	if (reset_timeout < 1)
277 		reset_timeout = 1;
278 	chip->reset_timeout = reset_timeout;
279 
280 	err = snd_cs8427_init(bus, device);
281 	if (err)
282 		goto __fail;
283 
284 #if 0	// it's nice for read tests
285 	{
286 	char buf[128];
287 	int xx;
288 	buf[0] = 0x81;
289 	snd_i2c_sendbytes(device, buf, 1);
290 	snd_i2c_readbytes(device, buf, 127);
291 	for (xx = 0; xx < 127; xx++)
292 		printk(KERN_DEBUG "reg[0x%x] = 0x%x\n", xx+1, buf[xx]);
293 	}
294 #endif
295 
296 	if (r_cs8427)
297 		*r_cs8427 = device;
298 	return 0;
299 
300       __fail:
301       	snd_i2c_device_free(device);
302       	return err < 0 ? err : -EIO;
303 }
304 
305 EXPORT_SYMBOL(snd_cs8427_create);
306 
307 /*
308  * Reset the chip using run bit, also lock PLL using ILRCK and
309  * put back AES3INPUT. This workaround is described in latest
310  * CS8427 datasheet, otherwise TXDSERIAL will not work.
311  */
snd_cs8427_reset(struct snd_i2c_device * cs8427)312 static void snd_cs8427_reset(struct snd_i2c_device *cs8427)
313 {
314 	struct cs8427 *chip;
315 	unsigned long end_time;
316 	int data, aes3input = 0;
317 
318 	if (snd_BUG_ON(!cs8427))
319 		return;
320 	chip = cs8427->private_data;
321 	snd_i2c_lock(cs8427->bus);
322 	if ((chip->regmap[CS8427_REG_CLOCKSOURCE] & CS8427_RXDAES3INPUT) ==
323 	    CS8427_RXDAES3INPUT)  /* AES3 bit is set */
324 		aes3input = 1;
325 	chip->regmap[CS8427_REG_CLOCKSOURCE] &= ~(CS8427_RUN | CS8427_RXDMASK);
326 	snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE,
327 			     chip->regmap[CS8427_REG_CLOCKSOURCE]);
328 	udelay(200);
329 	chip->regmap[CS8427_REG_CLOCKSOURCE] |= CS8427_RUN | CS8427_RXDILRCK;
330 	snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE,
331 			     chip->regmap[CS8427_REG_CLOCKSOURCE]);
332 	udelay(200);
333 	snd_i2c_unlock(cs8427->bus);
334 	end_time = jiffies + chip->reset_timeout;
335 	while (time_after_eq(end_time, jiffies)) {
336 		snd_i2c_lock(cs8427->bus);
337 		data = snd_cs8427_reg_read(cs8427, CS8427_REG_RECVERRORS);
338 		snd_i2c_unlock(cs8427->bus);
339 		if (!(data & CS8427_UNLOCK))
340 			break;
341 		schedule_timeout_uninterruptible(1);
342 	}
343 	snd_i2c_lock(cs8427->bus);
344 	chip->regmap[CS8427_REG_CLOCKSOURCE] &= ~CS8427_RXDMASK;
345 	if (aes3input)
346 		chip->regmap[CS8427_REG_CLOCKSOURCE] |= CS8427_RXDAES3INPUT;
347 	snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE,
348 			     chip->regmap[CS8427_REG_CLOCKSOURCE]);
349 	snd_i2c_unlock(cs8427->bus);
350 }
351 
snd_cs8427_in_status_info(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_info * uinfo)352 static int snd_cs8427_in_status_info(struct snd_kcontrol *kcontrol,
353 				     struct snd_ctl_elem_info *uinfo)
354 {
355 	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
356 	uinfo->count = 1;
357 	uinfo->value.integer.min = 0;
358 	uinfo->value.integer.max = 255;
359 	return 0;
360 }
361 
snd_cs8427_in_status_get(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)362 static int snd_cs8427_in_status_get(struct snd_kcontrol *kcontrol,
363 				    struct snd_ctl_elem_value *ucontrol)
364 {
365 	struct snd_i2c_device *device = snd_kcontrol_chip(kcontrol);
366 	int data;
367 
368 	snd_i2c_lock(device->bus);
369 	data = snd_cs8427_reg_read(device, kcontrol->private_value);
370 	snd_i2c_unlock(device->bus);
371 	if (data < 0)
372 		return data;
373 	ucontrol->value.integer.value[0] = data;
374 	return 0;
375 }
376 
snd_cs8427_qsubcode_info(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_info * uinfo)377 static int snd_cs8427_qsubcode_info(struct snd_kcontrol *kcontrol,
378 				    struct snd_ctl_elem_info *uinfo)
379 {
380 	uinfo->type = SNDRV_CTL_ELEM_TYPE_BYTES;
381 	uinfo->count = 10;
382 	return 0;
383 }
384 
snd_cs8427_qsubcode_get(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)385 static int snd_cs8427_qsubcode_get(struct snd_kcontrol *kcontrol,
386 				   struct snd_ctl_elem_value *ucontrol)
387 {
388 	struct snd_i2c_device *device = snd_kcontrol_chip(kcontrol);
389 	unsigned char reg = CS8427_REG_QSUBCODE;
390 	int err;
391 
392 	snd_i2c_lock(device->bus);
393 	err = snd_i2c_sendbytes(device, &reg, 1);
394 	if (err != 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 
snd_cs8427_spdif_info(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_info * uinfo)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 
snd_cs8427_spdif_get(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)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 
snd_cs8427_spdif_put(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)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 
snd_cs8427_spdif_mask_info(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_info * uinfo)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 
snd_cs8427_spdif_mask_get(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)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 const 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 
snd_cs8427_iec958_build(struct snd_i2c_device * cs8427,struct snd_pcm_substream * play_substream,struct snd_pcm_substream * cap_substream)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 	if (snd_BUG_ON(!play_substream || !cap_substream))
533 		return -EINVAL;
534 	for (idx = 0; idx < ARRAY_SIZE(snd_cs8427_iec958_controls); idx++) {
535 		kctl = snd_ctl_new1(&snd_cs8427_iec958_controls[idx], cs8427);
536 		if (kctl == NULL)
537 			return -ENOMEM;
538 		kctl->id.device = play_substream->pcm->device;
539 		kctl->id.subdevice = play_substream->number;
540 		err = snd_ctl_add(cs8427->bus->card, kctl);
541 		if (err < 0)
542 			return err;
543 		if (! strcmp(kctl->id.name,
544 			     SNDRV_CTL_NAME_IEC958("",PLAYBACK,PCM_STREAM)))
545 			chip->playback.pcm_ctl = kctl;
546 	}
547 
548 	chip->playback.substream = play_substream;
549 	chip->capture.substream = cap_substream;
550 	if (snd_BUG_ON(!chip->playback.pcm_ctl))
551 		return -EIO;
552 	return 0;
553 }
554 
555 EXPORT_SYMBOL(snd_cs8427_iec958_build);
556 
snd_cs8427_iec958_active(struct snd_i2c_device * cs8427,int active)557 int snd_cs8427_iec958_active(struct snd_i2c_device *cs8427, int active)
558 {
559 	struct cs8427 *chip;
560 
561 	if (snd_BUG_ON(!cs8427))
562 		return -ENXIO;
563 	chip = cs8427->private_data;
564 	if (active)
565 		memcpy(chip->playback.pcm_status,
566 		       chip->playback.def_status, 24);
567 	chip->playback.pcm_ctl->vd[0].access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
568 	snd_ctl_notify(cs8427->bus->card,
569 		       SNDRV_CTL_EVENT_MASK_VALUE | SNDRV_CTL_EVENT_MASK_INFO,
570 		       &chip->playback.pcm_ctl->id);
571 	return 0;
572 }
573 
574 EXPORT_SYMBOL(snd_cs8427_iec958_active);
575 
snd_cs8427_iec958_pcm(struct snd_i2c_device * cs8427,unsigned int rate)576 int snd_cs8427_iec958_pcm(struct snd_i2c_device *cs8427, unsigned int rate)
577 {
578 	struct cs8427 *chip;
579 	char *status;
580 	int err, reset;
581 
582 	if (snd_BUG_ON(!cs8427))
583 		return -ENXIO;
584 	chip = cs8427->private_data;
585 	status = chip->playback.pcm_status;
586 	snd_i2c_lock(cs8427->bus);
587 	if (status[0] & IEC958_AES0_PROFESSIONAL) {
588 		status[0] &= ~IEC958_AES0_PRO_FS;
589 		switch (rate) {
590 		case 32000: status[0] |= IEC958_AES0_PRO_FS_32000; break;
591 		case 44100: status[0] |= IEC958_AES0_PRO_FS_44100; break;
592 		case 48000: status[0] |= IEC958_AES0_PRO_FS_48000; break;
593 		default: status[0] |= IEC958_AES0_PRO_FS_NOTID; break;
594 		}
595 	} else {
596 		status[3] &= ~IEC958_AES3_CON_FS;
597 		switch (rate) {
598 		case 32000: status[3] |= IEC958_AES3_CON_FS_32000; break;
599 		case 44100: status[3] |= IEC958_AES3_CON_FS_44100; break;
600 		case 48000: status[3] |= IEC958_AES3_CON_FS_48000; break;
601 		}
602 	}
603 	err = snd_cs8427_send_corudata(cs8427, 0, status, 24);
604 	if (err > 0)
605 		snd_ctl_notify(cs8427->bus->card,
606 			       SNDRV_CTL_EVENT_MASK_VALUE,
607 			       &chip->playback.pcm_ctl->id);
608 	reset = chip->rate != rate;
609 	chip->rate = rate;
610 	snd_i2c_unlock(cs8427->bus);
611 	if (reset)
612 		snd_cs8427_reset(cs8427);
613 	return err < 0 ? err : 0;
614 }
615 
616 EXPORT_SYMBOL(snd_cs8427_iec958_pcm);
617