2 * wm8731.c -- WM8731 ALSA SoC Audio driver
4 * Copyright 2005 Openedhand Ltd.
6 * Author: Richard Purdie <richard@openedhand.com>
8 * Based on wm8753.c by Liam Girdwood
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
15 #include <linux/module.h>
16 #include <linux/moduleparam.h>
17 #include <linux/init.h>
18 #include <linux/delay.h>
20 #include <linux/i2c.h>
21 #include <linux/platform_device.h>
22 #include <linux/spi/spi.h>
23 #include <sound/core.h>
24 #include <sound/pcm.h>
25 #include <sound/pcm_params.h>
26 #include <sound/soc.h>
27 #include <sound/soc-dapm.h>
28 #include <sound/initval.h>
29 #include <sound/tlv.h>
33 static struct snd_soc_codec *wm8731_codec;
34 struct snd_soc_codec_device soc_codec_dev_wm8731;
36 /* codec private data */
38 struct snd_soc_codec codec;
39 u16 reg_cache[WM8731_CACHEREGNUM];
43 #ifdef CONFIG_SPI_MASTER
44 static int wm8731_spi_write(struct spi_device *spi, const char *data, int len);
48 * wm8731 register cache
49 * We can't read the WM8731 register space when we are
50 * using 2 wire for device control, so we cache them instead.
51 * There is no point in caching the reset register
53 static const u16 wm8731_reg[WM8731_CACHEREGNUM] = {
54 0x0097, 0x0097, 0x0079, 0x0079,
55 0x000a, 0x0008, 0x009f, 0x000a,
60 * read wm8731 register cache
62 static inline unsigned int wm8731_read_reg_cache(struct snd_soc_codec *codec,
65 u16 *cache = codec->reg_cache;
66 if (reg == WM8731_RESET)
68 if (reg >= WM8731_CACHEREGNUM)
74 * write wm8731 register cache
76 static inline void wm8731_write_reg_cache(struct snd_soc_codec *codec,
77 u16 reg, unsigned int value)
79 u16 *cache = codec->reg_cache;
80 if (reg >= WM8731_CACHEREGNUM)
86 * write to the WM8731 register space
88 static int wm8731_write(struct snd_soc_codec *codec, unsigned int reg,
94 * D15..D9 WM8731 register offset
95 * D8...D0 register data
97 data[0] = (reg << 1) | ((value >> 8) & 0x0001);
98 data[1] = value & 0x00ff;
100 wm8731_write_reg_cache(codec, reg, value);
101 if (codec->hw_write(codec->control_data, data, 2) == 2)
107 #define wm8731_reset(c) wm8731_write(c, WM8731_RESET, 0)
109 static const char *wm8731_input_select[] = {"Line In", "Mic"};
110 static const char *wm8731_deemph[] = {"None", "32Khz", "44.1Khz", "48Khz"};
112 static const struct soc_enum wm8731_enum[] = {
113 SOC_ENUM_SINGLE(WM8731_APANA, 2, 2, wm8731_input_select),
114 SOC_ENUM_SINGLE(WM8731_APDIGI, 1, 4, wm8731_deemph),
117 static const DECLARE_TLV_DB_SCALE(in_tlv, -3450, 150, 0);
118 static const DECLARE_TLV_DB_SCALE(sidetone_tlv, -1500, 300, 0);
119 static const DECLARE_TLV_DB_SCALE(out_tlv, -12100, 100, 1);
121 static const struct snd_kcontrol_new wm8731_snd_controls[] = {
123 SOC_DOUBLE_R_TLV("Master Playback Volume", WM8731_LOUT1V, WM8731_ROUT1V,
125 SOC_DOUBLE_R("Master Playback ZC Switch", WM8731_LOUT1V, WM8731_ROUT1V,
128 SOC_DOUBLE_R_TLV("Capture Volume", WM8731_LINVOL, WM8731_RINVOL, 0, 31, 0,
130 SOC_DOUBLE_R("Line Capture Switch", WM8731_LINVOL, WM8731_RINVOL, 7, 1, 1),
132 SOC_SINGLE("Mic Boost (+20dB)", WM8731_APANA, 0, 1, 0),
133 SOC_SINGLE("Capture Mic Switch", WM8731_APANA, 1, 1, 1),
135 SOC_SINGLE_TLV("Sidetone Playback Volume", WM8731_APANA, 6, 3, 1,
138 SOC_SINGLE("ADC High Pass Filter Switch", WM8731_APDIGI, 0, 1, 1),
139 SOC_SINGLE("Store DC Offset Switch", WM8731_APDIGI, 4, 1, 0),
141 SOC_ENUM("Playback De-emphasis", wm8731_enum[1]),
145 static const struct snd_kcontrol_new wm8731_output_mixer_controls[] = {
146 SOC_DAPM_SINGLE("Line Bypass Switch", WM8731_APANA, 3, 1, 0),
147 SOC_DAPM_SINGLE("Mic Sidetone Switch", WM8731_APANA, 5, 1, 0),
148 SOC_DAPM_SINGLE("HiFi Playback Switch", WM8731_APANA, 4, 1, 0),
152 static const struct snd_kcontrol_new wm8731_input_mux_controls =
153 SOC_DAPM_ENUM("Input Select", wm8731_enum[0]);
155 static const struct snd_soc_dapm_widget wm8731_dapm_widgets[] = {
156 SND_SOC_DAPM_MIXER("Output Mixer", WM8731_PWR, 4, 1,
157 &wm8731_output_mixer_controls[0],
158 ARRAY_SIZE(wm8731_output_mixer_controls)),
159 SND_SOC_DAPM_DAC("DAC", "HiFi Playback", WM8731_PWR, 3, 1),
160 SND_SOC_DAPM_OUTPUT("LOUT"),
161 SND_SOC_DAPM_OUTPUT("LHPOUT"),
162 SND_SOC_DAPM_OUTPUT("ROUT"),
163 SND_SOC_DAPM_OUTPUT("RHPOUT"),
164 SND_SOC_DAPM_ADC("ADC", "HiFi Capture", WM8731_PWR, 2, 1),
165 SND_SOC_DAPM_MUX("Input Mux", SND_SOC_NOPM, 0, 0, &wm8731_input_mux_controls),
166 SND_SOC_DAPM_PGA("Line Input", WM8731_PWR, 0, 1, NULL, 0),
167 SND_SOC_DAPM_MICBIAS("Mic Bias", WM8731_PWR, 1, 1),
168 SND_SOC_DAPM_INPUT("MICIN"),
169 SND_SOC_DAPM_INPUT("RLINEIN"),
170 SND_SOC_DAPM_INPUT("LLINEIN"),
173 static const struct snd_soc_dapm_route intercon[] = {
175 {"Output Mixer", "Line Bypass Switch", "Line Input"},
176 {"Output Mixer", "HiFi Playback Switch", "DAC"},
177 {"Output Mixer", "Mic Sidetone Switch", "Mic Bias"},
180 {"RHPOUT", NULL, "Output Mixer"},
181 {"ROUT", NULL, "Output Mixer"},
182 {"LHPOUT", NULL, "Output Mixer"},
183 {"LOUT", NULL, "Output Mixer"},
186 {"Input Mux", "Line In", "Line Input"},
187 {"Input Mux", "Mic", "Mic Bias"},
188 {"ADC", NULL, "Input Mux"},
191 {"Line Input", NULL, "LLINEIN"},
192 {"Line Input", NULL, "RLINEIN"},
193 {"Mic Bias", NULL, "MICIN"},
196 static int wm8731_add_widgets(struct snd_soc_codec *codec)
198 snd_soc_dapm_new_controls(codec, wm8731_dapm_widgets,
199 ARRAY_SIZE(wm8731_dapm_widgets));
201 snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon));
203 snd_soc_dapm_new_widgets(codec);
216 /* codec mclk clock divider coefficients */
217 static const struct _coeff_div coeff_div[] = {
219 {12288000, 48000, 256, 0x0, 0x0, 0x0},
220 {18432000, 48000, 384, 0x0, 0x1, 0x0},
221 {12000000, 48000, 250, 0x0, 0x0, 0x1},
224 {12288000, 32000, 384, 0x6, 0x0, 0x0},
225 {18432000, 32000, 576, 0x6, 0x1, 0x0},
226 {12000000, 32000, 375, 0x6, 0x0, 0x1},
229 {12288000, 8000, 1536, 0x3, 0x0, 0x0},
230 {18432000, 8000, 2304, 0x3, 0x1, 0x0},
231 {11289600, 8000, 1408, 0xb, 0x0, 0x0},
232 {16934400, 8000, 2112, 0xb, 0x1, 0x0},
233 {12000000, 8000, 1500, 0x3, 0x0, 0x1},
236 {12288000, 96000, 128, 0x7, 0x0, 0x0},
237 {18432000, 96000, 192, 0x7, 0x1, 0x0},
238 {12000000, 96000, 125, 0x7, 0x0, 0x1},
241 {11289600, 44100, 256, 0x8, 0x0, 0x0},
242 {16934400, 44100, 384, 0x8, 0x1, 0x0},
243 {12000000, 44100, 272, 0x8, 0x1, 0x1},
246 {11289600, 88200, 128, 0xf, 0x0, 0x0},
247 {16934400, 88200, 192, 0xf, 0x1, 0x0},
248 {12000000, 88200, 136, 0xf, 0x1, 0x1},
251 static inline int get_coeff(int mclk, int rate)
255 for (i = 0; i < ARRAY_SIZE(coeff_div); i++) {
256 if (coeff_div[i].rate == rate && coeff_div[i].mclk == mclk)
262 static int wm8731_hw_params(struct snd_pcm_substream *substream,
263 struct snd_pcm_hw_params *params,
264 struct snd_soc_dai *dai)
266 struct snd_soc_pcm_runtime *rtd = substream->private_data;
267 struct snd_soc_device *socdev = rtd->socdev;
268 struct snd_soc_codec *codec = socdev->card->codec;
269 struct wm8731_priv *wm8731 = codec->private_data;
270 u16 iface = wm8731_read_reg_cache(codec, WM8731_IFACE) & 0xfff3;
271 int i = get_coeff(wm8731->sysclk, params_rate(params));
272 u16 srate = (coeff_div[i].sr << 2) |
273 (coeff_div[i].bosr << 1) | coeff_div[i].usb;
275 wm8731_write(codec, WM8731_SRATE, srate);
278 switch (params_format(params)) {
279 case SNDRV_PCM_FORMAT_S16_LE:
281 case SNDRV_PCM_FORMAT_S20_3LE:
284 case SNDRV_PCM_FORMAT_S24_LE:
289 wm8731_write(codec, WM8731_IFACE, iface);
293 static int wm8731_pcm_prepare(struct snd_pcm_substream *substream,
294 struct snd_soc_dai *dai)
296 struct snd_soc_pcm_runtime *rtd = substream->private_data;
297 struct snd_soc_device *socdev = rtd->socdev;
298 struct snd_soc_codec *codec = socdev->card->codec;
301 wm8731_write(codec, WM8731_ACTIVE, 0x0001);
306 static void wm8731_shutdown(struct snd_pcm_substream *substream,
307 struct snd_soc_dai *dai)
309 struct snd_soc_pcm_runtime *rtd = substream->private_data;
310 struct snd_soc_device *socdev = rtd->socdev;
311 struct snd_soc_codec *codec = socdev->card->codec;
314 if (!codec->active) {
316 wm8731_write(codec, WM8731_ACTIVE, 0x0);
320 static int wm8731_mute(struct snd_soc_dai *dai, int mute)
322 struct snd_soc_codec *codec = dai->codec;
323 u16 mute_reg = wm8731_read_reg_cache(codec, WM8731_APDIGI) & 0xfff7;
326 wm8731_write(codec, WM8731_APDIGI, mute_reg | 0x8);
328 wm8731_write(codec, WM8731_APDIGI, mute_reg);
332 static int wm8731_set_dai_sysclk(struct snd_soc_dai *codec_dai,
333 int clk_id, unsigned int freq, int dir)
335 struct snd_soc_codec *codec = codec_dai->codec;
336 struct wm8731_priv *wm8731 = codec->private_data;
344 wm8731->sysclk = freq;
351 static int wm8731_set_dai_fmt(struct snd_soc_dai *codec_dai,
354 struct snd_soc_codec *codec = codec_dai->codec;
357 /* set master/slave audio interface */
358 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
359 case SND_SOC_DAIFMT_CBM_CFM:
362 case SND_SOC_DAIFMT_CBS_CFS:
368 /* interface format */
369 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
370 case SND_SOC_DAIFMT_I2S:
373 case SND_SOC_DAIFMT_RIGHT_J:
375 case SND_SOC_DAIFMT_LEFT_J:
378 case SND_SOC_DAIFMT_DSP_A:
381 case SND_SOC_DAIFMT_DSP_B:
388 /* clock inversion */
389 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
390 case SND_SOC_DAIFMT_NB_NF:
392 case SND_SOC_DAIFMT_IB_IF:
395 case SND_SOC_DAIFMT_IB_NF:
398 case SND_SOC_DAIFMT_NB_IF:
406 wm8731_write(codec, WM8731_IFACE, iface);
410 static int wm8731_set_bias_level(struct snd_soc_codec *codec,
411 enum snd_soc_bias_level level)
416 case SND_SOC_BIAS_ON:
418 case SND_SOC_BIAS_PREPARE:
420 case SND_SOC_BIAS_STANDBY:
421 /* Clear PWROFF, gate CLKOUT, everything else as-is */
422 reg = wm8731_read_reg_cache(codec, WM8731_PWR) & 0xff7f;
423 wm8731_write(codec, WM8731_PWR, reg | 0x0040);
425 case SND_SOC_BIAS_OFF:
426 wm8731_write(codec, WM8731_ACTIVE, 0x0);
427 wm8731_write(codec, WM8731_PWR, 0xffff);
430 codec->bias_level = level;
434 #define WM8731_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
435 SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 |\
436 SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |\
437 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |\
438 SNDRV_PCM_RATE_96000)
440 #define WM8731_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
441 SNDRV_PCM_FMTBIT_S24_LE)
443 static struct snd_soc_dai_ops wm8731_dai_ops = {
444 .prepare = wm8731_pcm_prepare,
445 .hw_params = wm8731_hw_params,
446 .shutdown = wm8731_shutdown,
447 .digital_mute = wm8731_mute,
448 .set_sysclk = wm8731_set_dai_sysclk,
449 .set_fmt = wm8731_set_dai_fmt,
452 struct snd_soc_dai wm8731_dai = {
455 .stream_name = "Playback",
458 .rates = WM8731_RATES,
459 .formats = WM8731_FORMATS,},
461 .stream_name = "Capture",
464 .rates = WM8731_RATES,
465 .formats = WM8731_FORMATS,},
466 .ops = &wm8731_dai_ops,
468 EXPORT_SYMBOL_GPL(wm8731_dai);
471 static int wm8731_suspend(struct platform_device *pdev, pm_message_t state)
473 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
474 struct snd_soc_codec *codec = socdev->card->codec;
476 wm8731_write(codec, WM8731_ACTIVE, 0x0);
477 wm8731_set_bias_level(codec, SND_SOC_BIAS_OFF);
481 static int wm8731_resume(struct platform_device *pdev)
483 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
484 struct snd_soc_codec *codec = socdev->card->codec;
487 u16 *cache = codec->reg_cache;
489 /* Sync reg_cache with the hardware */
490 for (i = 0; i < ARRAY_SIZE(wm8731_reg); i++) {
491 data[0] = (i << 1) | ((cache[i] >> 8) & 0x0001);
492 data[1] = cache[i] & 0x00ff;
493 codec->hw_write(codec->control_data, data, 2);
495 wm8731_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
496 wm8731_set_bias_level(codec, codec->suspend_bias_level);
500 #define wm8731_suspend NULL
501 #define wm8731_resume NULL
504 static int wm8731_probe(struct platform_device *pdev)
506 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
507 struct snd_soc_codec *codec;
510 if (wm8731_codec == NULL) {
511 dev_err(&pdev->dev, "Codec device not registered\n");
515 socdev->card->codec = wm8731_codec;
516 codec = wm8731_codec;
519 ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
521 dev_err(codec->dev, "failed to create pcms: %d\n", ret);
525 snd_soc_add_controls(codec, wm8731_snd_controls,
526 ARRAY_SIZE(wm8731_snd_controls));
527 wm8731_add_widgets(codec);
528 ret = snd_soc_init_card(socdev);
530 dev_err(codec->dev, "failed to register card: %d\n", ret);
537 snd_soc_free_pcms(socdev);
538 snd_soc_dapm_free(socdev);
543 /* power down chip */
544 static int wm8731_remove(struct platform_device *pdev)
546 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
548 snd_soc_free_pcms(socdev);
549 snd_soc_dapm_free(socdev);
554 struct snd_soc_codec_device soc_codec_dev_wm8731 = {
555 .probe = wm8731_probe,
556 .remove = wm8731_remove,
557 .suspend = wm8731_suspend,
558 .resume = wm8731_resume,
560 EXPORT_SYMBOL_GPL(soc_codec_dev_wm8731);
562 static int wm8731_register(struct wm8731_priv *wm8731)
565 struct snd_soc_codec *codec = &wm8731->codec;
569 dev_err(codec->dev, "Another WM8731 is registered\n");
574 mutex_init(&codec->mutex);
575 INIT_LIST_HEAD(&codec->dapm_widgets);
576 INIT_LIST_HEAD(&codec->dapm_paths);
578 codec->private_data = wm8731;
579 codec->name = "WM8731";
580 codec->owner = THIS_MODULE;
581 codec->read = wm8731_read_reg_cache;
582 codec->write = wm8731_write;
583 codec->bias_level = SND_SOC_BIAS_OFF;
584 codec->set_bias_level = wm8731_set_bias_level;
585 codec->dai = &wm8731_dai;
587 codec->reg_cache_size = WM8731_CACHEREGNUM;
588 codec->reg_cache = &wm8731->reg_cache;
590 memcpy(codec->reg_cache, wm8731_reg, sizeof(wm8731_reg));
592 ret = wm8731_reset(codec);
594 dev_err(codec->dev, "Failed to issue reset: %d\n", ret);
598 wm8731_dai.dev = codec->dev;
600 wm8731_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
602 /* Latch the update bits */
603 reg = wm8731_read_reg_cache(codec, WM8731_LOUT1V);
604 wm8731_write(codec, WM8731_LOUT1V, reg & ~0x0100);
605 reg = wm8731_read_reg_cache(codec, WM8731_ROUT1V);
606 wm8731_write(codec, WM8731_ROUT1V, reg & ~0x0100);
607 reg = wm8731_read_reg_cache(codec, WM8731_LINVOL);
608 wm8731_write(codec, WM8731_LINVOL, reg & ~0x0100);
609 reg = wm8731_read_reg_cache(codec, WM8731_RINVOL);
610 wm8731_write(codec, WM8731_RINVOL, reg & ~0x0100);
612 /* Disable bypass path by default */
613 reg = wm8731_read_reg_cache(codec, WM8731_APANA);
614 wm8731_write(codec, WM8731_APANA, reg & ~0x4);
616 wm8731_codec = codec;
618 ret = snd_soc_register_codec(codec);
620 dev_err(codec->dev, "Failed to register codec: %d\n", ret);
624 ret = snd_soc_register_dai(&wm8731_dai);
626 dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
627 snd_soc_unregister_codec(codec);
634 snd_soc_unregister_codec(codec);
640 static void wm8731_unregister(struct wm8731_priv *wm8731)
642 wm8731_set_bias_level(&wm8731->codec, SND_SOC_BIAS_OFF);
643 snd_soc_unregister_dai(&wm8731_dai);
644 snd_soc_unregister_codec(&wm8731->codec);
649 #if defined(CONFIG_SPI_MASTER)
650 static int wm8731_spi_write(struct spi_device *spi, const char *data, int len)
652 struct spi_transfer t;
653 struct spi_message m;
662 spi_message_init(&m);
663 memset(&t, 0, (sizeof t));
668 spi_message_add_tail(&t, &m);
674 static int __devinit wm8731_spi_probe(struct spi_device *spi)
676 struct snd_soc_codec *codec;
677 struct wm8731_priv *wm8731;
679 wm8731 = kzalloc(sizeof(struct wm8731_priv), GFP_KERNEL);
683 codec = &wm8731->codec;
684 codec->control_data = spi;
685 codec->hw_write = (hw_write_t)wm8731_spi_write;
686 codec->dev = &spi->dev;
688 dev_set_drvdata(&spi->dev, wm8731);
690 return wm8731_register(wm8731);
693 static int __devexit wm8731_spi_remove(struct spi_device *spi)
695 struct wm8731_priv *wm8731 = dev_get_drvdata(&spi->dev);
697 wm8731_unregister(wm8731);
703 static int wm8731_spi_suspend(struct spi_device *spi, pm_message_t msg)
705 return snd_soc_suspend_device(&spi->dev);
708 static int wm8731_spi_resume(struct spi_device *spi)
710 return snd_soc_resume_device(&spi->dev);
713 #define wm8731_spi_suspend NULL
714 #define wm8731_spi_resume NULL
717 static struct spi_driver wm8731_spi_driver = {
720 .bus = &spi_bus_type,
721 .owner = THIS_MODULE,
723 .probe = wm8731_spi_probe,
724 .suspend = wm8731_spi_suspend,
725 .resume = wm8731_spi_resume,
726 .remove = __devexit_p(wm8731_spi_remove),
728 #endif /* CONFIG_SPI_MASTER */
730 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
731 static __devinit int wm8731_i2c_probe(struct i2c_client *i2c,
732 const struct i2c_device_id *id)
734 struct wm8731_priv *wm8731;
735 struct snd_soc_codec *codec;
737 wm8731 = kzalloc(sizeof(struct wm8731_priv), GFP_KERNEL);
741 codec = &wm8731->codec;
742 codec->hw_write = (hw_write_t)i2c_master_send;
744 i2c_set_clientdata(i2c, wm8731);
745 codec->control_data = i2c;
747 codec->dev = &i2c->dev;
749 return wm8731_register(wm8731);
752 static __devexit int wm8731_i2c_remove(struct i2c_client *client)
754 struct wm8731_priv *wm8731 = i2c_get_clientdata(client);
755 wm8731_unregister(wm8731);
760 static int wm8731_i2c_suspend(struct i2c_client *i2c, pm_message_t msg)
762 return snd_soc_suspend_device(&i2c->dev);
765 static int wm8731_i2c_resume(struct i2c_client *i2c)
767 return snd_soc_resume_device(&i2c->dev);
770 #define wm8731_i2c_suspend NULL
771 #define wm8731_i2c_resume NULL
774 static const struct i2c_device_id wm8731_i2c_id[] = {
778 MODULE_DEVICE_TABLE(i2c, wm8731_i2c_id);
780 static struct i2c_driver wm8731_i2c_driver = {
782 .name = "WM8731 I2C Codec",
783 .owner = THIS_MODULE,
785 .probe = wm8731_i2c_probe,
786 .remove = __devexit_p(wm8731_i2c_remove),
787 .suspend = wm8731_i2c_suspend,
788 .resume = wm8731_i2c_resume,
789 .id_table = wm8731_i2c_id,
793 static int __init wm8731_modinit(void)
796 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
797 ret = i2c_add_driver(&wm8731_i2c_driver);
799 printk(KERN_ERR "Failed to register WM8731 I2C driver: %d\n",
803 #if defined(CONFIG_SPI_MASTER)
804 ret = spi_register_driver(&wm8731_spi_driver);
806 printk(KERN_ERR "Failed to register WM8731 SPI driver: %d\n",
812 module_init(wm8731_modinit);
814 static void __exit wm8731_exit(void)
816 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
817 i2c_del_driver(&wm8731_i2c_driver);
819 #if defined(CONFIG_SPI_MASTER)
820 spi_unregister_driver(&wm8731_spi_driver);
823 module_exit(wm8731_exit);
825 MODULE_DESCRIPTION("ASoC WM8731 driver");
826 MODULE_AUTHOR("Richard Purdie");
827 MODULE_LICENSE("GPL");