2 * wm8731.c -- WM8731 ALSA SoC Audio driver
4 * Copyright 2005 Openedhand Ltd.
5 * Copyright 2006-12 Wolfson Microelectronics, plc
7 * Author: Richard Purdie <richard@openedhand.com>
9 * Based on wm8753.c by Liam Girdwood
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
16 #include <linux/module.h>
17 #include <linux/moduleparam.h>
18 #include <linux/init.h>
19 #include <linux/delay.h>
21 #include <linux/i2c.h>
22 #include <linux/slab.h>
23 #include <linux/regmap.h>
24 #include <linux/regulator/consumer.h>
25 #include <linux/spi/spi.h>
26 #include <linux/of_device.h>
27 #include <linux/mutex.h>
28 #include <linux/clk.h>
29 #include <sound/core.h>
30 #include <sound/pcm.h>
31 #include <sound/pcm_params.h>
32 #include <sound/soc.h>
33 #include <sound/initval.h>
34 #include <sound/tlv.h>
38 #define WM8731_NUM_SUPPLIES 4
39 static const char *wm8731_supply_names[WM8731_NUM_SUPPLIES] = {
46 /* codec private data */
48 struct regmap *regmap;
50 struct regulator_bulk_data supplies[WM8731_NUM_SUPPLIES];
51 const struct snd_pcm_hw_constraint_list *constraints;
62 * wm8731 register cache
64 static const struct reg_default wm8731_reg_defaults[] = {
77 static bool wm8731_volatile(struct device *dev, unsigned int reg)
79 return reg == WM8731_RESET;
82 #define wm8731_reset(m) regmap_write(m, WM8731_RESET, 0)
84 static const char *wm8731_input_select[] = {"Line In", "Mic"};
86 static SOC_ENUM_SINGLE_DECL(wm8731_insel_enum,
87 WM8731_APANA, 2, wm8731_input_select);
89 static int wm8731_deemph[] = { 0, 32000, 44100, 48000 };
91 static int wm8731_set_deemph(struct snd_soc_codec *codec)
93 struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);
96 /* If we're using deemphasis select the nearest available sample
101 for (i = 2; i < ARRAY_SIZE(wm8731_deemph); i++) {
102 if (abs(wm8731_deemph[i] - wm8731->playback_fs) <
103 abs(wm8731_deemph[best] - wm8731->playback_fs))
113 dev_dbg(codec->dev, "Set deemphasis %d (%dHz)\n",
114 best, wm8731_deemph[best]);
116 return snd_soc_update_bits(codec, WM8731_APDIGI, 0x6, val);
119 static int wm8731_get_deemph(struct snd_kcontrol *kcontrol,
120 struct snd_ctl_elem_value *ucontrol)
122 struct snd_soc_codec *codec = snd_soc_kcontrol_codec(kcontrol);
123 struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);
125 ucontrol->value.integer.value[0] = wm8731->deemph;
130 static int wm8731_put_deemph(struct snd_kcontrol *kcontrol,
131 struct snd_ctl_elem_value *ucontrol)
133 struct snd_soc_codec *codec = snd_soc_kcontrol_codec(kcontrol);
134 struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);
135 int deemph = ucontrol->value.integer.value[0];
141 mutex_lock(&wm8731->lock);
142 if (wm8731->deemph != deemph) {
143 wm8731->deemph = deemph;
145 wm8731_set_deemph(codec);
149 mutex_unlock(&wm8731->lock);
154 static const DECLARE_TLV_DB_SCALE(in_tlv, -3450, 150, 0);
155 static const DECLARE_TLV_DB_SCALE(sidetone_tlv, -1500, 300, 0);
156 static const DECLARE_TLV_DB_SCALE(out_tlv, -12100, 100, 1);
157 static const DECLARE_TLV_DB_SCALE(mic_tlv, 0, 2000, 0);
159 static const struct snd_kcontrol_new wm8731_snd_controls[] = {
161 SOC_DOUBLE_R_TLV("Master Playback Volume", WM8731_LOUT1V, WM8731_ROUT1V,
163 SOC_DOUBLE_R("Master Playback ZC Switch", WM8731_LOUT1V, WM8731_ROUT1V,
166 SOC_DOUBLE_R_TLV("Capture Volume", WM8731_LINVOL, WM8731_RINVOL, 0, 31, 0,
168 SOC_DOUBLE_R("Line Capture Switch", WM8731_LINVOL, WM8731_RINVOL, 7, 1, 1),
170 SOC_SINGLE_TLV("Mic Boost Volume", WM8731_APANA, 0, 1, 0, mic_tlv),
171 SOC_SINGLE("Mic Capture Switch", WM8731_APANA, 1, 1, 1),
173 SOC_SINGLE_TLV("Sidetone Playback Volume", WM8731_APANA, 6, 3, 1,
176 SOC_SINGLE("ADC High Pass Filter Switch", WM8731_APDIGI, 0, 1, 1),
177 SOC_SINGLE("Store DC Offset Switch", WM8731_APDIGI, 4, 1, 0),
179 SOC_SINGLE_BOOL_EXT("Playback Deemphasis Switch", 0,
180 wm8731_get_deemph, wm8731_put_deemph),
184 static const struct snd_kcontrol_new wm8731_output_mixer_controls[] = {
185 SOC_DAPM_SINGLE("Line Bypass Switch", WM8731_APANA, 3, 1, 0),
186 SOC_DAPM_SINGLE("Mic Sidetone Switch", WM8731_APANA, 5, 1, 0),
187 SOC_DAPM_SINGLE("HiFi Playback Switch", WM8731_APANA, 4, 1, 0),
191 static const struct snd_kcontrol_new wm8731_input_mux_controls =
192 SOC_DAPM_ENUM("Input Select", wm8731_insel_enum);
194 static const struct snd_soc_dapm_widget wm8731_dapm_widgets[] = {
195 SND_SOC_DAPM_SUPPLY("ACTIVE",WM8731_ACTIVE, 0, 0, NULL, 0),
196 SND_SOC_DAPM_SUPPLY("OSC", WM8731_PWR, 5, 1, NULL, 0),
197 SND_SOC_DAPM_MIXER("Output Mixer", WM8731_PWR, 4, 1,
198 &wm8731_output_mixer_controls[0],
199 ARRAY_SIZE(wm8731_output_mixer_controls)),
200 SND_SOC_DAPM_DAC("DAC", "HiFi Playback", WM8731_PWR, 3, 1),
201 SND_SOC_DAPM_OUTPUT("LOUT"),
202 SND_SOC_DAPM_OUTPUT("LHPOUT"),
203 SND_SOC_DAPM_OUTPUT("ROUT"),
204 SND_SOC_DAPM_OUTPUT("RHPOUT"),
205 SND_SOC_DAPM_ADC("ADC", "HiFi Capture", WM8731_PWR, 2, 1),
206 SND_SOC_DAPM_MUX("Input Mux", SND_SOC_NOPM, 0, 0, &wm8731_input_mux_controls),
207 SND_SOC_DAPM_PGA("Line Input", WM8731_PWR, 0, 1, NULL, 0),
208 SND_SOC_DAPM_MICBIAS("Mic Bias", WM8731_PWR, 1, 1),
209 SND_SOC_DAPM_INPUT("MICIN"),
210 SND_SOC_DAPM_INPUT("RLINEIN"),
211 SND_SOC_DAPM_INPUT("LLINEIN"),
214 static int wm8731_check_osc(struct snd_soc_dapm_widget *source,
215 struct snd_soc_dapm_widget *sink)
217 struct snd_soc_codec *codec = snd_soc_dapm_to_codec(source->dapm);
218 struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);
220 return wm8731->sysclk_type == WM8731_SYSCLK_XTAL;
223 static const struct snd_soc_dapm_route wm8731_intercon[] = {
224 {"DAC", NULL, "OSC", wm8731_check_osc},
225 {"ADC", NULL, "OSC", wm8731_check_osc},
226 {"DAC", NULL, "ACTIVE"},
227 {"ADC", NULL, "ACTIVE"},
230 {"Output Mixer", "Line Bypass Switch", "Line Input"},
231 {"Output Mixer", "HiFi Playback Switch", "DAC"},
232 {"Output Mixer", "Mic Sidetone Switch", "Mic Bias"},
235 {"RHPOUT", NULL, "Output Mixer"},
236 {"ROUT", NULL, "Output Mixer"},
237 {"LHPOUT", NULL, "Output Mixer"},
238 {"LOUT", NULL, "Output Mixer"},
241 {"Input Mux", "Line In", "Line Input"},
242 {"Input Mux", "Mic", "Mic Bias"},
243 {"ADC", NULL, "Input Mux"},
246 {"Line Input", NULL, "LLINEIN"},
247 {"Line Input", NULL, "RLINEIN"},
248 {"Mic Bias", NULL, "MICIN"},
260 /* codec mclk clock divider coefficients */
261 static const struct _coeff_div coeff_div[] = {
263 {12288000, 48000, 256, 0x0, 0x0, 0x0},
264 {18432000, 48000, 384, 0x0, 0x1, 0x0},
265 {12000000, 48000, 250, 0x0, 0x0, 0x1},
268 {12288000, 32000, 384, 0x6, 0x0, 0x0},
269 {18432000, 32000, 576, 0x6, 0x1, 0x0},
270 {12000000, 32000, 375, 0x6, 0x0, 0x1},
273 {12288000, 8000, 1536, 0x3, 0x0, 0x0},
274 {18432000, 8000, 2304, 0x3, 0x1, 0x0},
275 {11289600, 8000, 1408, 0xb, 0x0, 0x0},
276 {16934400, 8000, 2112, 0xb, 0x1, 0x0},
277 {12000000, 8000, 1500, 0x3, 0x0, 0x1},
280 {12288000, 96000, 128, 0x7, 0x0, 0x0},
281 {18432000, 96000, 192, 0x7, 0x1, 0x0},
282 {12000000, 96000, 125, 0x7, 0x0, 0x1},
285 {11289600, 44100, 256, 0x8, 0x0, 0x0},
286 {16934400, 44100, 384, 0x8, 0x1, 0x0},
287 {12000000, 44100, 272, 0x8, 0x1, 0x1},
290 {11289600, 88200, 128, 0xf, 0x0, 0x0},
291 {16934400, 88200, 192, 0xf, 0x1, 0x0},
292 {12000000, 88200, 136, 0xf, 0x1, 0x1},
295 /* rates constraints */
296 static const unsigned int wm8731_rates_12000000[] = {
297 8000, 32000, 44100, 48000, 96000, 88200,
300 static const unsigned int wm8731_rates_12288000_18432000[] = {
301 8000, 32000, 48000, 96000,
304 static const unsigned int wm8731_rates_11289600_16934400[] = {
308 static const struct snd_pcm_hw_constraint_list wm8731_constraints_12000000 = {
309 .list = wm8731_rates_12000000,
310 .count = ARRAY_SIZE(wm8731_rates_12000000),
314 struct snd_pcm_hw_constraint_list wm8731_constraints_12288000_18432000 = {
315 .list = wm8731_rates_12288000_18432000,
316 .count = ARRAY_SIZE(wm8731_rates_12288000_18432000),
320 struct snd_pcm_hw_constraint_list wm8731_constraints_11289600_16934400 = {
321 .list = wm8731_rates_11289600_16934400,
322 .count = ARRAY_SIZE(wm8731_rates_11289600_16934400),
325 static inline int get_coeff(int mclk, int rate)
329 for (i = 0; i < ARRAY_SIZE(coeff_div); i++) {
330 if (coeff_div[i].rate == rate && coeff_div[i].mclk == mclk)
336 static int wm8731_hw_params(struct snd_pcm_substream *substream,
337 struct snd_pcm_hw_params *params,
338 struct snd_soc_dai *dai)
340 struct snd_soc_codec *codec = dai->codec;
341 struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);
342 u16 iface = snd_soc_read(codec, WM8731_IFACE) & 0xfff3;
343 int i = get_coeff(wm8731->sysclk, params_rate(params));
344 u16 srate = (coeff_div[i].sr << 2) |
345 (coeff_div[i].bosr << 1) | coeff_div[i].usb;
347 wm8731->playback_fs = params_rate(params);
349 snd_soc_write(codec, WM8731_SRATE, srate);
352 switch (params_width(params)) {
363 wm8731_set_deemph(codec);
365 snd_soc_write(codec, WM8731_IFACE, iface);
369 static int wm8731_mute(struct snd_soc_dai *dai, int mute)
371 struct snd_soc_codec *codec = dai->codec;
372 u16 mute_reg = snd_soc_read(codec, WM8731_APDIGI) & 0xfff7;
375 snd_soc_write(codec, WM8731_APDIGI, mute_reg | 0x8);
377 snd_soc_write(codec, WM8731_APDIGI, mute_reg);
381 static int wm8731_set_dai_sysclk(struct snd_soc_dai *codec_dai,
382 int clk_id, unsigned int freq, int dir)
384 struct snd_soc_codec *codec = codec_dai->codec;
385 struct snd_soc_dapm_context *dapm = snd_soc_codec_get_dapm(codec);
386 struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);
389 case WM8731_SYSCLK_XTAL:
390 case WM8731_SYSCLK_MCLK:
391 if (wm8731->mclk && clk_set_rate(wm8731->mclk, freq))
393 wm8731->sysclk_type = clk_id;
401 wm8731->constraints = NULL;
404 wm8731->constraints = &wm8731_constraints_12000000;
408 wm8731->constraints = &wm8731_constraints_12288000_18432000;
412 wm8731->constraints = &wm8731_constraints_11289600_16934400;
418 wm8731->sysclk = freq;
420 snd_soc_dapm_sync(dapm);
426 static int wm8731_set_dai_fmt(struct snd_soc_dai *codec_dai,
429 struct snd_soc_codec *codec = codec_dai->codec;
432 /* set master/slave audio interface */
433 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
434 case SND_SOC_DAIFMT_CBM_CFM:
437 case SND_SOC_DAIFMT_CBS_CFS:
443 /* interface format */
444 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
445 case SND_SOC_DAIFMT_I2S:
448 case SND_SOC_DAIFMT_RIGHT_J:
450 case SND_SOC_DAIFMT_LEFT_J:
453 case SND_SOC_DAIFMT_DSP_A:
456 case SND_SOC_DAIFMT_DSP_B:
463 /* clock inversion */
464 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
465 case SND_SOC_DAIFMT_NB_NF:
467 case SND_SOC_DAIFMT_IB_IF:
470 case SND_SOC_DAIFMT_IB_NF:
473 case SND_SOC_DAIFMT_NB_IF:
481 snd_soc_write(codec, WM8731_IFACE, iface);
485 static int wm8731_set_bias_level(struct snd_soc_codec *codec,
486 enum snd_soc_bias_level level)
488 struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);
493 case SND_SOC_BIAS_ON:
495 ret = clk_prepare_enable(wm8731->mclk);
500 case SND_SOC_BIAS_PREPARE:
502 case SND_SOC_BIAS_STANDBY:
503 if (snd_soc_codec_get_bias_level(codec) == SND_SOC_BIAS_OFF) {
504 ret = regulator_bulk_enable(ARRAY_SIZE(wm8731->supplies),
509 regcache_sync(wm8731->regmap);
512 /* Clear PWROFF, gate CLKOUT, everything else as-is */
513 reg = snd_soc_read(codec, WM8731_PWR) & 0xff7f;
514 snd_soc_write(codec, WM8731_PWR, reg | 0x0040);
516 case SND_SOC_BIAS_OFF:
518 clk_disable_unprepare(wm8731->mclk);
519 snd_soc_write(codec, WM8731_PWR, 0xffff);
520 regulator_bulk_disable(ARRAY_SIZE(wm8731->supplies),
522 regcache_mark_dirty(wm8731->regmap);
528 static int wm8731_startup(struct snd_pcm_substream *substream,
529 struct snd_soc_dai *dai)
531 struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(dai->codec);
533 if (wm8731->constraints)
534 snd_pcm_hw_constraint_list(substream->runtime, 0,
535 SNDRV_PCM_HW_PARAM_RATE,
536 wm8731->constraints);
541 #define WM8731_RATES SNDRV_PCM_RATE_8000_96000
543 #define WM8731_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
544 SNDRV_PCM_FMTBIT_S24_LE)
546 static const struct snd_soc_dai_ops wm8731_dai_ops = {
547 .startup = wm8731_startup,
548 .hw_params = wm8731_hw_params,
549 .digital_mute = wm8731_mute,
550 .set_sysclk = wm8731_set_dai_sysclk,
551 .set_fmt = wm8731_set_dai_fmt,
554 static struct snd_soc_dai_driver wm8731_dai = {
555 .name = "wm8731-hifi",
557 .stream_name = "Playback",
560 .rates = WM8731_RATES,
561 .formats = WM8731_FORMATS,},
563 .stream_name = "Capture",
566 .rates = WM8731_RATES,
567 .formats = WM8731_FORMATS,},
568 .ops = &wm8731_dai_ops,
569 .symmetric_rates = 1,
572 static int wm8731_request_supplies(struct device *dev,
573 struct wm8731_priv *wm8731)
577 for (i = 0; i < ARRAY_SIZE(wm8731->supplies); i++)
578 wm8731->supplies[i].supply = wm8731_supply_names[i];
580 ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(wm8731->supplies),
583 dev_err(dev, "Failed to request supplies: %d\n", ret);
587 ret = regulator_bulk_enable(ARRAY_SIZE(wm8731->supplies),
590 dev_err(dev, "Failed to enable supplies: %d\n", ret);
597 static int wm8731_hw_init(struct device *dev, struct wm8731_priv *wm8731)
601 ret = wm8731_reset(wm8731->regmap);
603 dev_err(dev, "Failed to issue reset: %d\n", ret);
604 goto err_regulator_enable;
607 /* Clear POWEROFF, keep everything else disabled */
608 regmap_write(wm8731->regmap, WM8731_PWR, 0x7f);
610 /* Latch the update bits */
611 regmap_update_bits(wm8731->regmap, WM8731_LOUT1V, 0x100, 0);
612 regmap_update_bits(wm8731->regmap, WM8731_ROUT1V, 0x100, 0);
613 regmap_update_bits(wm8731->regmap, WM8731_LINVOL, 0x100, 0);
614 regmap_update_bits(wm8731->regmap, WM8731_RINVOL, 0x100, 0);
616 /* Disable bypass path by default */
617 regmap_update_bits(wm8731->regmap, WM8731_APANA, 0x8, 0);
619 regcache_mark_dirty(wm8731->regmap);
621 err_regulator_enable:
622 /* Regulators will be enabled by bias management */
623 regulator_bulk_disable(ARRAY_SIZE(wm8731->supplies), wm8731->supplies);
628 static struct snd_soc_codec_driver soc_codec_dev_wm8731 = {
629 .set_bias_level = wm8731_set_bias_level,
630 .suspend_bias_off = true,
632 .dapm_widgets = wm8731_dapm_widgets,
633 .num_dapm_widgets = ARRAY_SIZE(wm8731_dapm_widgets),
634 .dapm_routes = wm8731_intercon,
635 .num_dapm_routes = ARRAY_SIZE(wm8731_intercon),
636 .controls = wm8731_snd_controls,
637 .num_controls = ARRAY_SIZE(wm8731_snd_controls),
640 static const struct of_device_id wm8731_of_match[] = {
641 { .compatible = "wlf,wm8731", },
645 MODULE_DEVICE_TABLE(of, wm8731_of_match);
647 static const struct regmap_config wm8731_regmap = {
651 .max_register = WM8731_RESET,
652 .volatile_reg = wm8731_volatile,
654 .cache_type = REGCACHE_RBTREE,
655 .reg_defaults = wm8731_reg_defaults,
656 .num_reg_defaults = ARRAY_SIZE(wm8731_reg_defaults),
659 #if defined(CONFIG_SPI_MASTER)
660 static int wm8731_spi_probe(struct spi_device *spi)
662 struct wm8731_priv *wm8731;
665 wm8731 = devm_kzalloc(&spi->dev, sizeof(*wm8731), GFP_KERNEL);
669 wm8731->mclk = devm_clk_get(&spi->dev, "mclk");
670 if (IS_ERR(wm8731->mclk)) {
671 ret = PTR_ERR(wm8731->mclk);
672 if (ret == -ENOENT) {
674 dev_warn(&spi->dev, "Assuming static MCLK\n");
676 dev_err(&spi->dev, "Failed to get MCLK: %d\n",
682 mutex_init(&wm8731->lock);
684 spi_set_drvdata(spi, wm8731);
686 ret = wm8731_request_supplies(&spi->dev, wm8731);
690 wm8731->regmap = devm_regmap_init_spi(spi, &wm8731_regmap);
691 if (IS_ERR(wm8731->regmap)) {
692 ret = PTR_ERR(wm8731->regmap);
693 dev_err(&spi->dev, "Failed to allocate register map: %d\n",
698 ret = wm8731_hw_init(&spi->dev, wm8731);
702 ret = snd_soc_register_codec(&spi->dev,
703 &soc_codec_dev_wm8731, &wm8731_dai, 1);
705 dev_err(&spi->dev, "Failed to register CODEC: %d\n", ret);
712 static int wm8731_spi_remove(struct spi_device *spi)
714 snd_soc_unregister_codec(&spi->dev);
718 static struct spi_driver wm8731_spi_driver = {
721 .owner = THIS_MODULE,
722 .of_match_table = wm8731_of_match,
724 .probe = wm8731_spi_probe,
725 .remove = wm8731_spi_remove,
727 #endif /* CONFIG_SPI_MASTER */
729 #if IS_ENABLED(CONFIG_I2C)
730 static int wm8731_i2c_probe(struct i2c_client *i2c,
731 const struct i2c_device_id *id)
733 struct wm8731_priv *wm8731;
736 wm8731 = devm_kzalloc(&i2c->dev, sizeof(struct wm8731_priv),
741 wm8731->mclk = devm_clk_get(&i2c->dev, "mclk");
742 if (IS_ERR(wm8731->mclk)) {
743 ret = PTR_ERR(wm8731->mclk);
744 if (ret == -ENOENT) {
746 dev_warn(&i2c->dev, "Assuming static MCLK\n");
748 dev_err(&i2c->dev, "Failed to get MCLK: %d\n",
754 mutex_init(&wm8731->lock);
756 i2c_set_clientdata(i2c, wm8731);
758 ret = wm8731_request_supplies(&i2c->dev, wm8731);
762 wm8731->regmap = devm_regmap_init_i2c(i2c, &wm8731_regmap);
763 if (IS_ERR(wm8731->regmap)) {
764 ret = PTR_ERR(wm8731->regmap);
765 dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
770 ret = wm8731_hw_init(&i2c->dev, wm8731);
774 ret = snd_soc_register_codec(&i2c->dev,
775 &soc_codec_dev_wm8731, &wm8731_dai, 1);
777 dev_err(&i2c->dev, "Failed to register CODEC: %d\n", ret);
784 static int wm8731_i2c_remove(struct i2c_client *client)
786 snd_soc_unregister_codec(&client->dev);
790 static const struct i2c_device_id wm8731_i2c_id[] = {
794 MODULE_DEVICE_TABLE(i2c, wm8731_i2c_id);
796 static struct i2c_driver wm8731_i2c_driver = {
799 .of_match_table = wm8731_of_match,
801 .probe = wm8731_i2c_probe,
802 .remove = wm8731_i2c_remove,
803 .id_table = wm8731_i2c_id,
807 static int __init wm8731_modinit(void)
810 #if IS_ENABLED(CONFIG_I2C)
811 ret = i2c_add_driver(&wm8731_i2c_driver);
813 printk(KERN_ERR "Failed to register WM8731 I2C driver: %d\n",
817 #if defined(CONFIG_SPI_MASTER)
818 ret = spi_register_driver(&wm8731_spi_driver);
820 printk(KERN_ERR "Failed to register WM8731 SPI driver: %d\n",
826 module_init(wm8731_modinit);
828 static void __exit wm8731_exit(void)
830 #if IS_ENABLED(CONFIG_I2C)
831 i2c_del_driver(&wm8731_i2c_driver);
833 #if defined(CONFIG_SPI_MASTER)
834 spi_unregister_driver(&wm8731_spi_driver);
837 module_exit(wm8731_exit);
839 MODULE_DESCRIPTION("ASoC WM8731 driver");
840 MODULE_AUTHOR("Richard Purdie");
841 MODULE_LICENSE("GPL");