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29#include <linux/init.h>
30#include <linux/module.h>
31#include <linux/kernel.h>
32#include <linux/device.h>
33#include <sound/core.h>
34#include <sound/pcm.h>
35#include <sound/pcm_params.h>
36#include <sound/initval.h>
37#include <sound/soc.h>
38#include <sound/tlv.h>
39#include <sound/soc-dapm.h>
40#include <linux/spi/spi.h>
41#include "ad1938.h"
42
43
44struct ad1938_priv {
45 struct snd_soc_codec codec;
46 u8 reg_cache[AD1938_NUM_REGS];
47};
48
49static struct snd_soc_codec *ad1938_codec;
50struct snd_soc_codec_device soc_codec_dev_ad1938;
51static int ad1938_register(struct ad1938_priv *ad1938);
52static void ad1938_unregister(struct ad1938_priv *ad1938);
53
54
55
56
57static const char *ad1938_deemp[] = {"None", "48kHz", "44.1kHz", "32kHz"};
58
59static const struct soc_enum ad1938_deemp_enum =
60 SOC_ENUM_SINGLE(AD1938_DAC_CTRL2, 1, 4, ad1938_deemp);
61
62static const struct snd_kcontrol_new ad1938_snd_controls[] = {
63
64 SOC_DOUBLE_R("DAC1 Volume", AD1938_DAC_L1_VOL,
65 AD1938_DAC_R1_VOL, 0, 0xFF, 1),
66 SOC_DOUBLE_R("DAC2 Volume", AD1938_DAC_L2_VOL,
67 AD1938_DAC_R2_VOL, 0, 0xFF, 1),
68 SOC_DOUBLE_R("DAC3 Volume", AD1938_DAC_L3_VOL,
69 AD1938_DAC_R3_VOL, 0, 0xFF, 1),
70 SOC_DOUBLE_R("DAC4 Volume", AD1938_DAC_L4_VOL,
71 AD1938_DAC_R4_VOL, 0, 0xFF, 1),
72
73
74 SOC_DOUBLE("ADC1 Switch", AD1938_ADC_CTRL0, AD1938_ADCL1_MUTE,
75 AD1938_ADCR1_MUTE, 1, 1),
76 SOC_DOUBLE("ADC2 Switch", AD1938_ADC_CTRL0, AD1938_ADCL2_MUTE,
77 AD1938_ADCR2_MUTE, 1, 1),
78
79
80 SOC_DOUBLE("DAC1 Switch", AD1938_DAC_CHNL_MUTE, AD1938_DACL1_MUTE,
81 AD1938_DACR1_MUTE, 1, 1),
82 SOC_DOUBLE("DAC2 Switch", AD1938_DAC_CHNL_MUTE, AD1938_DACL2_MUTE,
83 AD1938_DACR2_MUTE, 1, 1),
84 SOC_DOUBLE("DAC3 Switch", AD1938_DAC_CHNL_MUTE, AD1938_DACL3_MUTE,
85 AD1938_DACR3_MUTE, 1, 1),
86 SOC_DOUBLE("DAC4 Switch", AD1938_DAC_CHNL_MUTE, AD1938_DACL4_MUTE,
87 AD1938_DACR4_MUTE, 1, 1),
88
89
90 SOC_SINGLE("ADC High Pass Filter Switch", AD1938_ADC_CTRL0,
91 AD1938_ADC_HIGHPASS_FILTER, 1, 0),
92
93
94 SOC_ENUM("Playback Deemphasis", ad1938_deemp_enum),
95};
96
97static const struct snd_soc_dapm_widget ad1938_dapm_widgets[] = {
98 SND_SOC_DAPM_DAC("DAC", "Playback", AD1938_DAC_CTRL0, 0, 1),
99 SND_SOC_DAPM_ADC("ADC", "Capture", SND_SOC_NOPM, 0, 0),
100 SND_SOC_DAPM_SUPPLY("ADC_PWR", AD1938_ADC_CTRL0, 0, 1, NULL, 0),
101 SND_SOC_DAPM_OUTPUT("DAC1OUT"),
102 SND_SOC_DAPM_OUTPUT("DAC2OUT"),
103 SND_SOC_DAPM_OUTPUT("DAC3OUT"),
104 SND_SOC_DAPM_OUTPUT("DAC4OUT"),
105 SND_SOC_DAPM_INPUT("ADC1IN"),
106 SND_SOC_DAPM_INPUT("ADC2IN"),
107};
108
109static const struct snd_soc_dapm_route audio_paths[] = {
110 { "DAC", NULL, "ADC_PWR" },
111 { "ADC", NULL, "ADC_PWR" },
112 { "DAC1OUT", "DAC1 Switch", "DAC" },
113 { "DAC2OUT", "DAC2 Switch", "DAC" },
114 { "DAC3OUT", "DAC3 Switch", "DAC" },
115 { "DAC4OUT", "DAC4 Switch", "DAC" },
116 { "ADC", "ADC1 Switch", "ADC1IN" },
117 { "ADC", "ADC2 Switch", "ADC2IN" },
118};
119
120
121
122
123
124static int ad1938_mute(struct snd_soc_dai *dai, int mute)
125{
126 struct snd_soc_codec *codec = dai->codec;
127 int reg;
128
129 reg = codec->read(codec, AD1938_DAC_CTRL2);
130 reg = (mute > 0) ? reg | AD1938_DAC_MASTER_MUTE : reg &
131 (~AD1938_DAC_MASTER_MUTE);
132 codec->write(codec, AD1938_DAC_CTRL2, reg);
133
134 return 0;
135}
136
137static inline int ad1938_pll_powerctrl(struct snd_soc_codec *codec, int cmd)
138{
139 int reg = codec->read(codec, AD1938_PLL_CLK_CTRL0);
140 reg = (cmd > 0) ? reg & (~AD1938_PLL_POWERDOWN) : reg |
141 AD1938_PLL_POWERDOWN;
142 codec->write(codec, AD1938_PLL_CLK_CTRL0, reg);
143
144 return 0;
145}
146
147static int ad1938_set_tdm_slot(struct snd_soc_dai *dai, unsigned int tx_mask,
148 unsigned int mask, int slots, int width)
149{
150 struct snd_soc_codec *codec = dai->codec;
151 int dac_reg = codec->read(codec, AD1938_DAC_CTRL1);
152 int adc_reg = codec->read(codec, AD1938_ADC_CTRL2);
153
154 dac_reg &= ~AD1938_DAC_CHAN_MASK;
155 adc_reg &= ~AD1938_ADC_CHAN_MASK;
156
157 switch (slots) {
158 case 2:
159 dac_reg |= AD1938_DAC_2_CHANNELS << AD1938_DAC_CHAN_SHFT;
160 adc_reg |= AD1938_ADC_2_CHANNELS << AD1938_ADC_CHAN_SHFT;
161 break;
162 case 4:
163 dac_reg |= AD1938_DAC_4_CHANNELS << AD1938_DAC_CHAN_SHFT;
164 adc_reg |= AD1938_ADC_4_CHANNELS << AD1938_ADC_CHAN_SHFT;
165 break;
166 case 8:
167 dac_reg |= AD1938_DAC_8_CHANNELS << AD1938_DAC_CHAN_SHFT;
168 adc_reg |= AD1938_ADC_8_CHANNELS << AD1938_ADC_CHAN_SHFT;
169 break;
170 case 16:
171 dac_reg |= AD1938_DAC_16_CHANNELS << AD1938_DAC_CHAN_SHFT;
172 adc_reg |= AD1938_ADC_16_CHANNELS << AD1938_ADC_CHAN_SHFT;
173 break;
174 default:
175 return -EINVAL;
176 }
177
178 codec->write(codec, AD1938_DAC_CTRL1, dac_reg);
179 codec->write(codec, AD1938_ADC_CTRL2, adc_reg);
180
181 return 0;
182}
183
184static int ad1938_set_dai_fmt(struct snd_soc_dai *codec_dai,
185 unsigned int fmt)
186{
187 struct snd_soc_codec *codec = codec_dai->codec;
188 int adc_reg, dac_reg;
189
190 adc_reg = codec->read(codec, AD1938_ADC_CTRL2);
191 dac_reg = codec->read(codec, AD1938_DAC_CTRL1);
192
193
194
195
196 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
197 case SND_SOC_DAIFMT_I2S:
198 adc_reg &= ~AD1938_ADC_SERFMT_MASK;
199 adc_reg |= AD1938_ADC_SERFMT_TDM;
200 break;
201 case SND_SOC_DAIFMT_DSP_A:
202 adc_reg &= ~AD1938_ADC_SERFMT_MASK;
203 adc_reg |= AD1938_ADC_SERFMT_AUX;
204 break;
205 default:
206 return -EINVAL;
207 }
208
209 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
210 case SND_SOC_DAIFMT_NB_NF:
211 adc_reg &= ~AD1938_ADC_LEFT_HIGH;
212 adc_reg &= ~AD1938_ADC_BCLK_INV;
213 dac_reg &= ~AD1938_DAC_LEFT_HIGH;
214 dac_reg &= ~AD1938_DAC_BCLK_INV;
215 break;
216 case SND_SOC_DAIFMT_NB_IF:
217 adc_reg |= AD1938_ADC_LEFT_HIGH;
218 adc_reg &= ~AD1938_ADC_BCLK_INV;
219 dac_reg |= AD1938_DAC_LEFT_HIGH;
220 dac_reg &= ~AD1938_DAC_BCLK_INV;
221 break;
222 case SND_SOC_DAIFMT_IB_NF:
223 adc_reg &= ~AD1938_ADC_LEFT_HIGH;
224 adc_reg |= AD1938_ADC_BCLK_INV;
225 dac_reg &= ~AD1938_DAC_LEFT_HIGH;
226 dac_reg |= AD1938_DAC_BCLK_INV;
227 break;
228
229 case SND_SOC_DAIFMT_IB_IF:
230 adc_reg |= AD1938_ADC_LEFT_HIGH;
231 adc_reg |= AD1938_ADC_BCLK_INV;
232 dac_reg |= AD1938_DAC_LEFT_HIGH;
233 dac_reg |= AD1938_DAC_BCLK_INV;
234 break;
235 default:
236 return -EINVAL;
237 }
238
239 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
240 case SND_SOC_DAIFMT_CBM_CFM:
241 adc_reg |= AD1938_ADC_LCR_MASTER;
242 adc_reg |= AD1938_ADC_BCLK_MASTER;
243 dac_reg |= AD1938_DAC_LCR_MASTER;
244 dac_reg |= AD1938_DAC_BCLK_MASTER;
245 break;
246 case SND_SOC_DAIFMT_CBS_CFM:
247 adc_reg |= AD1938_ADC_LCR_MASTER;
248 adc_reg &= ~AD1938_ADC_BCLK_MASTER;
249 dac_reg |= AD1938_DAC_LCR_MASTER;
250 dac_reg &= ~AD1938_DAC_BCLK_MASTER;
251 break;
252 case SND_SOC_DAIFMT_CBM_CFS:
253 adc_reg &= ~AD1938_ADC_LCR_MASTER;
254 adc_reg |= AD1938_ADC_BCLK_MASTER;
255 dac_reg &= ~AD1938_DAC_LCR_MASTER;
256 dac_reg |= AD1938_DAC_BCLK_MASTER;
257 break;
258 case SND_SOC_DAIFMT_CBS_CFS:
259 adc_reg &= ~AD1938_ADC_LCR_MASTER;
260 adc_reg &= ~AD1938_ADC_BCLK_MASTER;
261 dac_reg &= ~AD1938_DAC_LCR_MASTER;
262 dac_reg &= ~AD1938_DAC_BCLK_MASTER;
263 break;
264 default:
265 return -EINVAL;
266 }
267
268 codec->write(codec, AD1938_ADC_CTRL2, adc_reg);
269 codec->write(codec, AD1938_DAC_CTRL1, dac_reg);
270
271 return 0;
272}
273
274static int ad1938_hw_params(struct snd_pcm_substream *substream,
275 struct snd_pcm_hw_params *params,
276 struct snd_soc_dai *dai)
277{
278 int word_len = 0, reg = 0;
279
280 struct snd_soc_pcm_runtime *rtd = substream->private_data;
281 struct snd_soc_device *socdev = rtd->socdev;
282 struct snd_soc_codec *codec = socdev->card->codec;
283
284
285 switch (params_format(params)) {
286 case SNDRV_PCM_FORMAT_S16_LE:
287 word_len = 3;
288 break;
289 case SNDRV_PCM_FORMAT_S20_3LE:
290 word_len = 1;
291 break;
292 case SNDRV_PCM_FORMAT_S24_LE:
293 case SNDRV_PCM_FORMAT_S32_LE:
294 word_len = 0;
295 break;
296 }
297
298 reg = codec->read(codec, AD1938_DAC_CTRL2);
299 reg = (reg & (~AD1938_DAC_WORD_LEN_MASK)) | word_len;
300 codec->write(codec, AD1938_DAC_CTRL2, reg);
301
302 reg = codec->read(codec, AD1938_ADC_CTRL1);
303 reg = (reg & (~AD1938_ADC_WORD_LEN_MASK)) | word_len;
304 codec->write(codec, AD1938_ADC_CTRL1, reg);
305
306 return 0;
307}
308
309static int ad1938_set_bias_level(struct snd_soc_codec *codec,
310 enum snd_soc_bias_level level)
311{
312 switch (level) {
313 case SND_SOC_BIAS_ON:
314 ad1938_pll_powerctrl(codec, 1);
315 break;
316 case SND_SOC_BIAS_PREPARE:
317 break;
318 case SND_SOC_BIAS_STANDBY:
319 case SND_SOC_BIAS_OFF:
320 ad1938_pll_powerctrl(codec, 0);
321 break;
322 }
323 codec->bias_level = level;
324 return 0;
325}
326
327
328
329
330
331#define AD1938_SPI_ADDR 0x4
332#define AD1938_SPI_READ 0x1
333#define AD1938_SPI_BUFLEN 3
334
335
336
337
338
339static int ad1938_write_reg(struct snd_soc_codec *codec, unsigned int reg,
340 unsigned int value)
341{
342 u8 *reg_cache = codec->reg_cache;
343 int ret = 0;
344
345 if (value != reg_cache[reg]) {
346 uint8_t buf[AD1938_SPI_BUFLEN];
347 struct spi_transfer t = {
348 .tx_buf = buf,
349 .len = AD1938_SPI_BUFLEN,
350 };
351 struct spi_message m;
352
353 buf[0] = AD1938_SPI_ADDR << 1;
354 buf[1] = reg;
355 buf[2] = value;
356 spi_message_init(&m);
357 spi_message_add_tail(&t, &m);
358 ret = spi_sync(codec->control_data, &m);
359 if (ret == 0)
360 reg_cache[reg] = value;
361 }
362
363 return ret;
364}
365
366
367
368
369
370static unsigned int ad1938_read_reg_cache(struct snd_soc_codec *codec,
371 unsigned int reg)
372{
373 u8 *reg_cache = codec->reg_cache;
374
375 if (reg >= codec->reg_cache_size)
376 return -EINVAL;
377
378 return reg_cache[reg];
379}
380
381
382
383
384
385static unsigned int ad1938_read_reg(struct snd_soc_codec *codec,
386 unsigned int reg)
387{
388 char w_buf[AD1938_SPI_BUFLEN];
389 char r_buf[AD1938_SPI_BUFLEN];
390 int ret;
391
392 struct spi_transfer t = {
393 .tx_buf = w_buf,
394 .rx_buf = r_buf,
395 .len = AD1938_SPI_BUFLEN,
396 };
397 struct spi_message m;
398
399 w_buf[0] = (AD1938_SPI_ADDR << 1) | AD1938_SPI_READ;
400 w_buf[1] = reg;
401 w_buf[2] = 0;
402
403 spi_message_init(&m);
404 spi_message_add_tail(&t, &m);
405 ret = spi_sync(codec->control_data, &m);
406 if (ret == 0)
407 return r_buf[2];
408 else
409 return -EIO;
410}
411
412static int ad1938_fill_cache(struct snd_soc_codec *codec)
413{
414 int i;
415 u8 *reg_cache = codec->reg_cache;
416 struct spi_device *spi = codec->control_data;
417
418 for (i = 0; i < codec->reg_cache_size; i++) {
419 int ret = ad1938_read_reg(codec, i);
420 if (ret == -EIO) {
421 dev_err(&spi->dev, "AD1938 SPI read failure\n");
422 return ret;
423 }
424 reg_cache[i] = ret;
425 }
426
427 return 0;
428}
429
430static int __devinit ad1938_spi_probe(struct spi_device *spi)
431{
432 struct snd_soc_codec *codec;
433 struct ad1938_priv *ad1938;
434
435 ad1938 = kzalloc(sizeof(struct ad1938_priv), GFP_KERNEL);
436 if (ad1938 == NULL)
437 return -ENOMEM;
438
439 codec = &ad1938->codec;
440 codec->control_data = spi;
441 codec->dev = &spi->dev;
442
443 dev_set_drvdata(&spi->dev, ad1938);
444
445 return ad1938_register(ad1938);
446}
447
448static int __devexit ad1938_spi_remove(struct spi_device *spi)
449{
450 struct ad1938_priv *ad1938 = dev_get_drvdata(&spi->dev);
451
452 ad1938_unregister(ad1938);
453 return 0;
454}
455
456static struct spi_driver ad1938_spi_driver = {
457 .driver = {
458 .name = "ad1938",
459 .owner = THIS_MODULE,
460 },
461 .probe = ad1938_spi_probe,
462 .remove = __devexit_p(ad1938_spi_remove),
463};
464
465static struct snd_soc_dai_ops ad1938_dai_ops = {
466 .hw_params = ad1938_hw_params,
467 .digital_mute = ad1938_mute,
468 .set_tdm_slot = ad1938_set_tdm_slot,
469 .set_fmt = ad1938_set_dai_fmt,
470};
471
472
473struct snd_soc_dai ad1938_dai = {
474 .name = "AD1938",
475 .playback = {
476 .stream_name = "Playback",
477 .channels_min = 2,
478 .channels_max = 8,
479 .rates = SNDRV_PCM_RATE_48000,
480 .formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S16_LE |
481 SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S24_LE,
482 },
483 .capture = {
484 .stream_name = "Capture",
485 .channels_min = 2,
486 .channels_max = 4,
487 .rates = SNDRV_PCM_RATE_48000,
488 .formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S16_LE |
489 SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S24_LE,
490 },
491 .ops = &ad1938_dai_ops,
492};
493EXPORT_SYMBOL_GPL(ad1938_dai);
494
495static int ad1938_register(struct ad1938_priv *ad1938)
496{
497 int ret;
498 struct snd_soc_codec *codec = &ad1938->codec;
499
500 if (ad1938_codec) {
501 dev_err(codec->dev, "Another ad1938 is registered\n");
502 return -EINVAL;
503 }
504
505 mutex_init(&codec->mutex);
506 INIT_LIST_HEAD(&codec->dapm_widgets);
507 INIT_LIST_HEAD(&codec->dapm_paths);
508 codec->private_data = ad1938;
509 codec->reg_cache = ad1938->reg_cache;
510 codec->reg_cache_size = AD1938_NUM_REGS;
511 codec->name = "AD1938";
512 codec->owner = THIS_MODULE;
513 codec->dai = &ad1938_dai;
514 codec->num_dai = 1;
515 codec->write = ad1938_write_reg;
516 codec->read = ad1938_read_reg_cache;
517 codec->set_bias_level = ad1938_set_bias_level;
518 INIT_LIST_HEAD(&codec->dapm_widgets);
519 INIT_LIST_HEAD(&codec->dapm_paths);
520
521 ad1938_dai.dev = codec->dev;
522 ad1938_codec = codec;
523
524
525
526
527 codec->write(codec, AD1938_DAC_CHNL_MUTE, 0x0);
528
529 codec->write(codec, AD1938_DAC_CTRL2, 0x1A);
530
531 codec->write(codec, AD1938_DAC_CTRL0, 0x41);
532
533 codec->write(codec, AD1938_ADC_CTRL0, 0x3);
534
535 codec->write(codec, AD1938_ADC_CTRL1, 0x43);
536
537 codec->write(codec, AD1938_PLL_CLK_CTRL0, 0x9D);
538 codec->write(codec, AD1938_PLL_CLK_CTRL1, 0x04);
539
540 ad1938_fill_cache(codec);
541
542 ret = snd_soc_register_codec(codec);
543 if (ret != 0) {
544 dev_err(codec->dev, "Failed to register codec: %d\n", ret);
545 kfree(ad1938);
546 return ret;
547 }
548
549 ret = snd_soc_register_dai(&ad1938_dai);
550 if (ret != 0) {
551 dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
552 snd_soc_unregister_codec(codec);
553 kfree(ad1938);
554 return ret;
555 }
556
557 return 0;
558}
559
560static void ad1938_unregister(struct ad1938_priv *ad1938)
561{
562 ad1938_set_bias_level(&ad1938->codec, SND_SOC_BIAS_OFF);
563 snd_soc_unregister_dai(&ad1938_dai);
564 snd_soc_unregister_codec(&ad1938->codec);
565 kfree(ad1938);
566 ad1938_codec = NULL;
567}
568
569static int ad1938_probe(struct platform_device *pdev)
570{
571 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
572 struct snd_soc_codec *codec;
573 int ret = 0;
574
575 if (ad1938_codec == NULL) {
576 dev_err(&pdev->dev, "Codec device not registered\n");
577 return -ENODEV;
578 }
579
580 socdev->card->codec = ad1938_codec;
581 codec = ad1938_codec;
582
583
584 ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
585 if (ret < 0) {
586 dev_err(codec->dev, "failed to create pcms: %d\n", ret);
587 goto pcm_err;
588 }
589
590 snd_soc_add_controls(codec, ad1938_snd_controls,
591 ARRAY_SIZE(ad1938_snd_controls));
592 snd_soc_dapm_new_controls(codec, ad1938_dapm_widgets,
593 ARRAY_SIZE(ad1938_dapm_widgets));
594 snd_soc_dapm_add_routes(codec, audio_paths, ARRAY_SIZE(audio_paths));
595 snd_soc_dapm_new_widgets(codec);
596
597 ad1938_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
598
599 ret = snd_soc_init_card(socdev);
600 if (ret < 0) {
601 dev_err(codec->dev, "failed to register card: %d\n", ret);
602 goto card_err;
603 }
604
605 return ret;
606
607card_err:
608 snd_soc_free_pcms(socdev);
609 snd_soc_dapm_free(socdev);
610pcm_err:
611 return ret;
612}
613
614
615static int ad1938_remove(struct platform_device *pdev)
616{
617 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
618
619 snd_soc_free_pcms(socdev);
620 snd_soc_dapm_free(socdev);
621
622 return 0;
623}
624
625#ifdef CONFIG_PM
626static int ad1938_suspend(struct platform_device *pdev,
627 pm_message_t state)
628{
629 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
630 struct snd_soc_codec *codec = socdev->card->codec;
631
632 ad1938_set_bias_level(codec, SND_SOC_BIAS_OFF);
633 return 0;
634}
635
636static int ad1938_resume(struct platform_device *pdev)
637{
638 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
639 struct snd_soc_codec *codec = socdev->card->codec;
640
641 if (codec->suspend_bias_level == SND_SOC_BIAS_ON)
642 ad1938_set_bias_level(codec, SND_SOC_BIAS_ON);
643
644 return 0;
645}
646#else
647#define ad1938_suspend NULL
648#define ad1938_resume NULL
649#endif
650
651struct snd_soc_codec_device soc_codec_dev_ad1938 = {
652 .probe = ad1938_probe,
653 .remove = ad1938_remove,
654 .suspend = ad1938_suspend,
655 .resume = ad1938_resume,
656};
657EXPORT_SYMBOL_GPL(soc_codec_dev_ad1938);
658
659static int __init ad1938_init(void)
660{
661 int ret;
662
663 ret = spi_register_driver(&ad1938_spi_driver);
664 if (ret != 0) {
665 printk(KERN_ERR "Failed to register ad1938 SPI driver: %d\n",
666 ret);
667 }
668
669 return ret;
670}
671module_init(ad1938_init);
672
673static void __exit ad1938_exit(void)
674{
675 spi_unregister_driver(&ad1938_spi_driver);
676}
677module_exit(ad1938_exit);
678
679MODULE_DESCRIPTION("ASoC ad1938 driver");
680MODULE_AUTHOR("Barry Song ");
681MODULE_LICENSE("GPL");
682
