1 /*
2 * AD1843 low level driver
3 *
4 * Copyright 2003 Vivien Chappelier <vivien.chappelier@linux-mips.org>
5 * Copyright 2008 Thomas Bogendoerfer <tsbogend@alpha.franken.de>
6 *
7 * inspired from vwsnd.c (SGI VW audio driver)
8 * Copyright 1999 Silicon Graphics, Inc. All rights reserved.
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 *
24 */
25
26 #include <linux/init.h>
27 #include <linux/sched.h>
28 #include <linux/errno.h>
29 #include <sound/core.h>
30 #include <sound/pcm.h>
31 #include <sound/ad1843.h>
32
33 /*
34 * AD1843 bitfield definitions. All are named as in the AD1843 data
35 * sheet, with ad1843_ prepended and individual bit numbers removed.
36 *
37 * E.g., bits LSS0 through LSS2 become ad1843_LSS.
38 *
39 * Only the bitfields we need are defined.
40 */
41
42 struct ad1843_bitfield {
43 char reg;
44 char lo_bit;
45 char nbits;
46 };
47
48 static const struct ad1843_bitfield
49 ad1843_PDNO = { 0, 14, 1 }, /* Converter Power-Down Flag */
50 ad1843_INIT = { 0, 15, 1 }, /* Clock Initialization Flag */
51 ad1843_RIG = { 2, 0, 4 }, /* Right ADC Input Gain */
52 ad1843_RMGE = { 2, 4, 1 }, /* Right ADC Mic Gain Enable */
53 ad1843_RSS = { 2, 5, 3 }, /* Right ADC Source Select */
54 ad1843_LIG = { 2, 8, 4 }, /* Left ADC Input Gain */
55 ad1843_LMGE = { 2, 12, 1 }, /* Left ADC Mic Gain Enable */
56 ad1843_LSS = { 2, 13, 3 }, /* Left ADC Source Select */
57 ad1843_RD2M = { 3, 0, 5 }, /* Right DAC 2 Mix Gain/Atten */
58 ad1843_RD2MM = { 3, 7, 1 }, /* Right DAC 2 Mix Mute */
59 ad1843_LD2M = { 3, 8, 5 }, /* Left DAC 2 Mix Gain/Atten */
60 ad1843_LD2MM = { 3, 15, 1 }, /* Left DAC 2 Mix Mute */
61 ad1843_RX1M = { 4, 0, 5 }, /* Right Aux 1 Mix Gain/Atten */
62 ad1843_RX1MM = { 4, 7, 1 }, /* Right Aux 1 Mix Mute */
63 ad1843_LX1M = { 4, 8, 5 }, /* Left Aux 1 Mix Gain/Atten */
64 ad1843_LX1MM = { 4, 15, 1 }, /* Left Aux 1 Mix Mute */
65 ad1843_RX2M = { 5, 0, 5 }, /* Right Aux 2 Mix Gain/Atten */
66 ad1843_RX2MM = { 5, 7, 1 }, /* Right Aux 2 Mix Mute */
67 ad1843_LX2M = { 5, 8, 5 }, /* Left Aux 2 Mix Gain/Atten */
68 ad1843_LX2MM = { 5, 15, 1 }, /* Left Aux 2 Mix Mute */
69 ad1843_RMCM = { 7, 0, 5 }, /* Right Mic Mix Gain/Atten */
70 ad1843_RMCMM = { 7, 7, 1 }, /* Right Mic Mix Mute */
71 ad1843_LMCM = { 7, 8, 5 }, /* Left Mic Mix Gain/Atten */
72 ad1843_LMCMM = { 7, 15, 1 }, /* Left Mic Mix Mute */
73 ad1843_HPOS = { 8, 4, 1 }, /* Headphone Output Voltage Swing */
74 ad1843_HPOM = { 8, 5, 1 }, /* Headphone Output Mute */
75 ad1843_MPOM = { 8, 6, 1 }, /* Mono Output Mute */
76 ad1843_RDA1G = { 9, 0, 6 }, /* Right DAC1 Analog/Digital Gain */
77 ad1843_RDA1GM = { 9, 7, 1 }, /* Right DAC1 Analog Mute */
78 ad1843_LDA1G = { 9, 8, 6 }, /* Left DAC1 Analog/Digital Gain */
79 ad1843_LDA1GM = { 9, 15, 1 }, /* Left DAC1 Analog Mute */
80 ad1843_RDA2G = { 10, 0, 6 }, /* Right DAC2 Analog/Digital Gain */
81 ad1843_RDA2GM = { 10, 7, 1 }, /* Right DAC2 Analog Mute */
82 ad1843_LDA2G = { 10, 8, 6 }, /* Left DAC2 Analog/Digital Gain */
83 ad1843_LDA2GM = { 10, 15, 1 }, /* Left DAC2 Analog Mute */
84 ad1843_RDA1AM = { 11, 7, 1 }, /* Right DAC1 Digital Mute */
85 ad1843_LDA1AM = { 11, 15, 1 }, /* Left DAC1 Digital Mute */
86 ad1843_RDA2AM = { 12, 7, 1 }, /* Right DAC2 Digital Mute */
87 ad1843_LDA2AM = { 12, 15, 1 }, /* Left DAC2 Digital Mute */
88 ad1843_ADLC = { 15, 0, 2 }, /* ADC Left Sample Rate Source */
89 ad1843_ADRC = { 15, 2, 2 }, /* ADC Right Sample Rate Source */
90 ad1843_DA1C = { 15, 8, 2 }, /* DAC1 Sample Rate Source */
91 ad1843_DA2C = { 15, 10, 2 }, /* DAC2 Sample Rate Source */
92 ad1843_C1C = { 17, 0, 16 }, /* Clock 1 Sample Rate Select */
93 ad1843_C2C = { 20, 0, 16 }, /* Clock 2 Sample Rate Select */
94 ad1843_C3C = { 23, 0, 16 }, /* Clock 3 Sample Rate Select */
95 ad1843_DAADL = { 25, 4, 2 }, /* Digital ADC Left Source Select */
96 ad1843_DAADR = { 25, 6, 2 }, /* Digital ADC Right Source Select */
97 ad1843_DAMIX = { 25, 14, 1 }, /* DAC Digital Mix Enable */
98 ad1843_DRSFLT = { 25, 15, 1 }, /* Digital Reampler Filter Mode */
99 ad1843_ADLF = { 26, 0, 2 }, /* ADC Left Channel Data Format */
100 ad1843_ADRF = { 26, 2, 2 }, /* ADC Right Channel Data Format */
101 ad1843_ADTLK = { 26, 4, 1 }, /* ADC Transmit Lock Mode Select */
102 ad1843_SCF = { 26, 7, 1 }, /* SCLK Frequency Select */
103 ad1843_DA1F = { 26, 8, 2 }, /* DAC1 Data Format Select */
104 ad1843_DA2F = { 26, 10, 2 }, /* DAC2 Data Format Select */
105 ad1843_DA1SM = { 26, 14, 1 }, /* DAC1 Stereo/Mono Mode Select */
106 ad1843_DA2SM = { 26, 15, 1 }, /* DAC2 Stereo/Mono Mode Select */
107 ad1843_ADLEN = { 27, 0, 1 }, /* ADC Left Channel Enable */
108 ad1843_ADREN = { 27, 1, 1 }, /* ADC Right Channel Enable */
109 ad1843_AAMEN = { 27, 4, 1 }, /* Analog to Analog Mix Enable */
110 ad1843_ANAEN = { 27, 7, 1 }, /* Analog Channel Enable */
111 ad1843_DA1EN = { 27, 8, 1 }, /* DAC1 Enable */
112 ad1843_DA2EN = { 27, 9, 1 }, /* DAC2 Enable */
113 ad1843_DDMEN = { 27, 12, 1 }, /* DAC2 to DAC1 Mix Enable */
114 ad1843_C1EN = { 28, 11, 1 }, /* Clock Generator 1 Enable */
115 ad1843_C2EN = { 28, 12, 1 }, /* Clock Generator 2 Enable */
116 ad1843_C3EN = { 28, 13, 1 }, /* Clock Generator 3 Enable */
117 ad1843_PDNI = { 28, 15, 1 }; /* Converter Power Down */
118
119 /*
120 * The various registers of the AD1843 use three different formats for
121 * specifying gain. The ad1843_gain structure parameterizes the
122 * formats.
123 */
124
125 struct ad1843_gain {
126 int negative; /* nonzero if gain is negative. */
127 const struct ad1843_bitfield *lfield;
128 const struct ad1843_bitfield *rfield;
129 const struct ad1843_bitfield *lmute;
130 const struct ad1843_bitfield *rmute;
131 };
132
133 static const struct ad1843_gain ad1843_gain_RECLEV = {
134 .negative = 0,
135 .lfield = &ad1843_LIG,
136 .rfield = &ad1843_RIG
137 };
138 static const struct ad1843_gain ad1843_gain_LINE = {
139 .negative = 1,
140 .lfield = &ad1843_LX1M,
141 .rfield = &ad1843_RX1M,
142 .lmute = &ad1843_LX1MM,
143 .rmute = &ad1843_RX1MM
144 };
145 static const struct ad1843_gain ad1843_gain_LINE_2 = {
146 .negative = 1,
147 .lfield = &ad1843_LDA2G,
148 .rfield = &ad1843_RDA2G,
149 .lmute = &ad1843_LDA2GM,
150 .rmute = &ad1843_RDA2GM
151 };
152 static const struct ad1843_gain ad1843_gain_MIC = {
153 .negative = 1,
154 .lfield = &ad1843_LMCM,
155 .rfield = &ad1843_RMCM,
156 .lmute = &ad1843_LMCMM,
157 .rmute = &ad1843_RMCMM
158 };
159 static const struct ad1843_gain ad1843_gain_PCM_0 = {
160 .negative = 1,
161 .lfield = &ad1843_LDA1G,
162 .rfield = &ad1843_RDA1G,
163 .lmute = &ad1843_LDA1GM,
164 .rmute = &ad1843_RDA1GM
165 };
166 static const struct ad1843_gain ad1843_gain_PCM_1 = {
167 .negative = 1,
168 .lfield = &ad1843_LD2M,
169 .rfield = &ad1843_RD2M,
170 .lmute = &ad1843_LD2MM,
171 .rmute = &ad1843_RD2MM
172 };
173
174 static const struct ad1843_gain *ad1843_gain[AD1843_GAIN_SIZE] =
175 {
176 &ad1843_gain_RECLEV,
177 &ad1843_gain_LINE,
178 &ad1843_gain_LINE_2,
179 &ad1843_gain_MIC,
180 &ad1843_gain_PCM_0,
181 &ad1843_gain_PCM_1,
182 };
183
184 /* read the current value of an AD1843 bitfield. */
185
ad1843_read_bits(struct snd_ad1843 * ad1843,const struct ad1843_bitfield * field)186 static int ad1843_read_bits(struct snd_ad1843 *ad1843,
187 const struct ad1843_bitfield *field)
188 {
189 int w;
190
191 w = ad1843->read(ad1843->chip, field->reg);
192 return w >> field->lo_bit & ((1 << field->nbits) - 1);
193 }
194
195 /*
196 * write a new value to an AD1843 bitfield and return the old value.
197 */
198
ad1843_write_bits(struct snd_ad1843 * ad1843,const struct ad1843_bitfield * field,int newval)199 static int ad1843_write_bits(struct snd_ad1843 *ad1843,
200 const struct ad1843_bitfield *field,
201 int newval)
202 {
203 int w, mask, oldval, newbits;
204
205 w = ad1843->read(ad1843->chip, field->reg);
206 mask = ((1 << field->nbits) - 1) << field->lo_bit;
207 oldval = (w & mask) >> field->lo_bit;
208 newbits = (newval << field->lo_bit) & mask;
209 w = (w & ~mask) | newbits;
210 ad1843->write(ad1843->chip, field->reg, w);
211
212 return oldval;
213 }
214
215 /*
216 * ad1843_read_multi reads multiple bitfields from the same AD1843
217 * register. It uses a single read cycle to do it. (Reading the
218 * ad1843 requires 256 bit times at 12.288 MHz, or nearly 20
219 * microseconds.)
220 *
221 * Called like this.
222 *
223 * ad1843_read_multi(ad1843, nfields,
224 * &ad1843_FIELD1, &val1,
225 * &ad1843_FIELD2, &val2, ...);
226 */
227
ad1843_read_multi(struct snd_ad1843 * ad1843,int argcount,...)228 static void ad1843_read_multi(struct snd_ad1843 *ad1843, int argcount, ...)
229 {
230 va_list ap;
231 const struct ad1843_bitfield *fp;
232 int w = 0, mask, *value, reg = -1;
233
234 va_start(ap, argcount);
235 while (--argcount >= 0) {
236 fp = va_arg(ap, const struct ad1843_bitfield *);
237 value = va_arg(ap, int *);
238 if (reg == -1) {
239 reg = fp->reg;
240 w = ad1843->read(ad1843->chip, reg);
241 }
242
243 mask = (1 << fp->nbits) - 1;
244 *value = w >> fp->lo_bit & mask;
245 }
246 va_end(ap);
247 }
248
249 /*
250 * ad1843_write_multi stores multiple bitfields into the same AD1843
251 * register. It uses one read and one write cycle to do it.
252 *
253 * Called like this.
254 *
255 * ad1843_write_multi(ad1843, nfields,
256 * &ad1843_FIELD1, val1,
257 * &ad1843_FIELF2, val2, ...);
258 */
259
ad1843_write_multi(struct snd_ad1843 * ad1843,int argcount,...)260 static void ad1843_write_multi(struct snd_ad1843 *ad1843, int argcount, ...)
261 {
262 va_list ap;
263 int reg;
264 const struct ad1843_bitfield *fp;
265 int value;
266 int w, m, mask, bits;
267
268 mask = 0;
269 bits = 0;
270 reg = -1;
271
272 va_start(ap, argcount);
273 while (--argcount >= 0) {
274 fp = va_arg(ap, const struct ad1843_bitfield *);
275 value = va_arg(ap, int);
276 if (reg == -1)
277 reg = fp->reg;
278 else
279 BUG_ON(reg != fp->reg);
280 m = ((1 << fp->nbits) - 1) << fp->lo_bit;
281 mask |= m;
282 bits |= (value << fp->lo_bit) & m;
283 }
284 va_end(ap);
285
286 if (~mask & 0xFFFF)
287 w = ad1843->read(ad1843->chip, reg);
288 else
289 w = 0;
290 w = (w & ~mask) | bits;
291 ad1843->write(ad1843->chip, reg, w);
292 }
293
ad1843_get_gain_max(struct snd_ad1843 * ad1843,int id)294 int ad1843_get_gain_max(struct snd_ad1843 *ad1843, int id)
295 {
296 const struct ad1843_gain *gp = ad1843_gain[id];
297 int ret;
298
299 ret = (1 << gp->lfield->nbits);
300 if (!gp->lmute)
301 ret -= 1;
302 return ret;
303 }
304
305 /*
306 * ad1843_get_gain reads the specified register and extracts the gain value
307 * using the supplied gain type.
308 */
309
ad1843_get_gain(struct snd_ad1843 * ad1843,int id)310 int ad1843_get_gain(struct snd_ad1843 *ad1843, int id)
311 {
312 int lg, rg, lm, rm;
313 const struct ad1843_gain *gp = ad1843_gain[id];
314 unsigned short mask = (1 << gp->lfield->nbits) - 1;
315
316 ad1843_read_multi(ad1843, 2, gp->lfield, &lg, gp->rfield, &rg);
317 if (gp->negative) {
318 lg = mask - lg;
319 rg = mask - rg;
320 }
321 if (gp->lmute) {
322 ad1843_read_multi(ad1843, 2, gp->lmute, &lm, gp->rmute, &rm);
323 if (lm)
324 lg = 0;
325 if (rm)
326 rg = 0;
327 }
328 return lg << 0 | rg << 8;
329 }
330
331 /*
332 * Set an audio channel's gain.
333 *
334 * Returns the new gain, which may be lower than the old gain.
335 */
336
ad1843_set_gain(struct snd_ad1843 * ad1843,int id,int newval)337 int ad1843_set_gain(struct snd_ad1843 *ad1843, int id, int newval)
338 {
339 const struct ad1843_gain *gp = ad1843_gain[id];
340 unsigned short mask = (1 << gp->lfield->nbits) - 1;
341
342 int lg = (newval >> 0) & mask;
343 int rg = (newval >> 8) & mask;
344 int lm = (lg == 0) ? 1 : 0;
345 int rm = (rg == 0) ? 1 : 0;
346
347 if (gp->negative) {
348 lg = mask - lg;
349 rg = mask - rg;
350 }
351 if (gp->lmute)
352 ad1843_write_multi(ad1843, 2, gp->lmute, lm, gp->rmute, rm);
353 ad1843_write_multi(ad1843, 2, gp->lfield, lg, gp->rfield, rg);
354 return ad1843_get_gain(ad1843, id);
355 }
356
357 /* Returns the current recording source */
358
ad1843_get_recsrc(struct snd_ad1843 * ad1843)359 int ad1843_get_recsrc(struct snd_ad1843 *ad1843)
360 {
361 int val = ad1843_read_bits(ad1843, &ad1843_LSS);
362
363 if (val < 0 || val > 2) {
364 val = 2;
365 ad1843_write_multi(ad1843, 2,
366 &ad1843_LSS, val, &ad1843_RSS, val);
367 }
368 return val;
369 }
370
371 /*
372 * Set recording source.
373 *
374 * Returns newsrc on success, -errno on failure.
375 */
376
ad1843_set_recsrc(struct snd_ad1843 * ad1843,int newsrc)377 int ad1843_set_recsrc(struct snd_ad1843 *ad1843, int newsrc)
378 {
379 if (newsrc < 0 || newsrc > 2)
380 return -EINVAL;
381
382 ad1843_write_multi(ad1843, 2, &ad1843_LSS, newsrc, &ad1843_RSS, newsrc);
383 return newsrc;
384 }
385
386 /* Setup ad1843 for D/A conversion. */
387
ad1843_setup_dac(struct snd_ad1843 * ad1843,unsigned int id,unsigned int framerate,snd_pcm_format_t fmt,unsigned int channels)388 void ad1843_setup_dac(struct snd_ad1843 *ad1843,
389 unsigned int id,
390 unsigned int framerate,
391 snd_pcm_format_t fmt,
392 unsigned int channels)
393 {
394 int ad_fmt = 0, ad_mode = 0;
395
396 switch (fmt) {
397 case SNDRV_PCM_FORMAT_S8:
398 ad_fmt = 0;
399 break;
400 case SNDRV_PCM_FORMAT_U8:
401 ad_fmt = 0;
402 break;
403 case SNDRV_PCM_FORMAT_S16_LE:
404 ad_fmt = 1;
405 break;
406 case SNDRV_PCM_FORMAT_MU_LAW:
407 ad_fmt = 2;
408 break;
409 case SNDRV_PCM_FORMAT_A_LAW:
410 ad_fmt = 3;
411 break;
412 default:
413 break;
414 }
415
416 switch (channels) {
417 case 2:
418 ad_mode = 0;
419 break;
420 case 1:
421 ad_mode = 1;
422 break;
423 default:
424 break;
425 }
426
427 if (id) {
428 ad1843_write_bits(ad1843, &ad1843_C2C, framerate);
429 ad1843_write_multi(ad1843, 2,
430 &ad1843_DA2SM, ad_mode,
431 &ad1843_DA2F, ad_fmt);
432 } else {
433 ad1843_write_bits(ad1843, &ad1843_C1C, framerate);
434 ad1843_write_multi(ad1843, 2,
435 &ad1843_DA1SM, ad_mode,
436 &ad1843_DA1F, ad_fmt);
437 }
438 }
439
ad1843_shutdown_dac(struct snd_ad1843 * ad1843,unsigned int id)440 void ad1843_shutdown_dac(struct snd_ad1843 *ad1843, unsigned int id)
441 {
442 if (id)
443 ad1843_write_bits(ad1843, &ad1843_DA2F, 1);
444 else
445 ad1843_write_bits(ad1843, &ad1843_DA1F, 1);
446 }
447
ad1843_setup_adc(struct snd_ad1843 * ad1843,unsigned int framerate,snd_pcm_format_t fmt,unsigned int channels)448 void ad1843_setup_adc(struct snd_ad1843 *ad1843,
449 unsigned int framerate,
450 snd_pcm_format_t fmt,
451 unsigned int channels)
452 {
453 int da_fmt = 0;
454
455 switch (fmt) {
456 case SNDRV_PCM_FORMAT_S8: da_fmt = 0; break;
457 case SNDRV_PCM_FORMAT_U8: da_fmt = 0; break;
458 case SNDRV_PCM_FORMAT_S16_LE: da_fmt = 1; break;
459 case SNDRV_PCM_FORMAT_MU_LAW: da_fmt = 2; break;
460 case SNDRV_PCM_FORMAT_A_LAW: da_fmt = 3; break;
461 default: break;
462 }
463
464 ad1843_write_bits(ad1843, &ad1843_C3C, framerate);
465 ad1843_write_multi(ad1843, 2,
466 &ad1843_ADLF, da_fmt, &ad1843_ADRF, da_fmt);
467 }
468
ad1843_shutdown_adc(struct snd_ad1843 * ad1843)469 void ad1843_shutdown_adc(struct snd_ad1843 *ad1843)
470 {
471 /* nothing to do */
472 }
473
474 /*
475 * Fully initialize the ad1843. As described in the AD1843 data
476 * sheet, section "START-UP SEQUENCE". The numbered comments are
477 * subsection headings from the data sheet. See the data sheet, pages
478 * 52-54, for more info.
479 *
480 * return 0 on success, -errno on failure. */
481
ad1843_init(struct snd_ad1843 * ad1843)482 int ad1843_init(struct snd_ad1843 *ad1843)
483 {
484 unsigned long later;
485
486 if (ad1843_read_bits(ad1843, &ad1843_INIT) != 0) {
487 printk(KERN_ERR "ad1843: AD1843 won't initialize\n");
488 return -EIO;
489 }
490
491 ad1843_write_bits(ad1843, &ad1843_SCF, 1);
492
493 /* 4. Put the conversion resources into standby. */
494 ad1843_write_bits(ad1843, &ad1843_PDNI, 0);
495 later = jiffies + msecs_to_jiffies(500);
496
497 while (ad1843_read_bits(ad1843, &ad1843_PDNO)) {
498 if (time_after(jiffies, later)) {
499 printk(KERN_ERR
500 "ad1843: AD1843 won't power up\n");
501 return -EIO;
502 }
503 schedule_timeout_interruptible(5);
504 }
505
506 /* 5. Power up the clock generators and enable clock output pins. */
507 ad1843_write_multi(ad1843, 3,
508 &ad1843_C1EN, 1,
509 &ad1843_C2EN, 1,
510 &ad1843_C3EN, 1);
511
512 /* 6. Configure conversion resources while they are in standby. */
513
514 /* DAC1/2 use clock 1/2 as source, ADC uses clock 3. Always. */
515 ad1843_write_multi(ad1843, 4,
516 &ad1843_DA1C, 1,
517 &ad1843_DA2C, 2,
518 &ad1843_ADLC, 3,
519 &ad1843_ADRC, 3);
520
521 /* 7. Enable conversion resources. */
522 ad1843_write_bits(ad1843, &ad1843_ADTLK, 1);
523 ad1843_write_multi(ad1843, 7,
524 &ad1843_ANAEN, 1,
525 &ad1843_AAMEN, 1,
526 &ad1843_DA1EN, 1,
527 &ad1843_DA2EN, 1,
528 &ad1843_DDMEN, 1,
529 &ad1843_ADLEN, 1,
530 &ad1843_ADREN, 1);
531
532 /* 8. Configure conversion resources while they are enabled. */
533
534 /* set gain to 0 for all channels */
535 ad1843_set_gain(ad1843, AD1843_GAIN_RECLEV, 0);
536 ad1843_set_gain(ad1843, AD1843_GAIN_LINE, 0);
537 ad1843_set_gain(ad1843, AD1843_GAIN_LINE_2, 0);
538 ad1843_set_gain(ad1843, AD1843_GAIN_MIC, 0);
539 ad1843_set_gain(ad1843, AD1843_GAIN_PCM_0, 0);
540 ad1843_set_gain(ad1843, AD1843_GAIN_PCM_1, 0);
541
542 /* Unmute all channels. */
543 /* DAC1 */
544 ad1843_write_multi(ad1843, 2, &ad1843_LDA1GM, 0, &ad1843_RDA1GM, 0);
545 /* DAC2 */
546 ad1843_write_multi(ad1843, 2, &ad1843_LDA2GM, 0, &ad1843_RDA2GM, 0);
547
548 /* Set default recording source to Line In and set
549 * mic gain to +20 dB.
550 */
551 ad1843_set_recsrc(ad1843, 2);
552 ad1843_write_multi(ad1843, 2, &ad1843_LMGE, 1, &ad1843_RMGE, 1);
553
554 /* Set Speaker Out level to +/- 4V and unmute it. */
555 ad1843_write_multi(ad1843, 3,
556 &ad1843_HPOS, 1,
557 &ad1843_HPOM, 0,
558 &ad1843_MPOM, 0);
559
560 return 0;
561 }
562