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 <sound/core.h>
29 #include <sound/pcm.h>
30 #include <sound/pcm_params.h>
31 #include <sound/soc.h>
32 #include <sound/initval.h>
33 #include <sound/tlv.h>
37 #define WM8731_NUM_SUPPLIES 4
38 static const char *wm8731_supply_names
[WM8731_NUM_SUPPLIES
] = {
45 /* codec private data */
47 struct regmap
*regmap
;
48 struct regulator_bulk_data supplies
[WM8731_NUM_SUPPLIES
];
49 const struct snd_pcm_hw_constraint_list
*constraints
;
60 * wm8731 register cache
62 static const struct reg_default wm8731_reg_defaults
[] = {
75 static bool wm8731_volatile(struct device
*dev
, unsigned int reg
)
77 return reg
== WM8731_RESET
;
80 static bool wm8731_writeable(struct device
*dev
, unsigned int reg
)
82 return reg
<= WM8731_RESET
;
85 #define wm8731_reset(c) snd_soc_write(c, WM8731_RESET, 0)
87 static const char *wm8731_input_select
[] = {"Line In", "Mic"};
89 static SOC_ENUM_SINGLE_DECL(wm8731_insel_enum
,
90 WM8731_APANA
, 2, wm8731_input_select
);
92 static int wm8731_deemph
[] = { 0, 32000, 44100, 48000 };
94 static int wm8731_set_deemph(struct snd_soc_codec
*codec
)
96 struct wm8731_priv
*wm8731
= snd_soc_codec_get_drvdata(codec
);
99 /* If we're using deemphasis select the nearest available sample
102 if (wm8731
->deemph
) {
104 for (i
= 2; i
< ARRAY_SIZE(wm8731_deemph
); i
++) {
105 if (abs(wm8731_deemph
[i
] - wm8731
->playback_fs
) <
106 abs(wm8731_deemph
[best
] - wm8731
->playback_fs
))
116 dev_dbg(codec
->dev
, "Set deemphasis %d (%dHz)\n",
117 best
, wm8731_deemph
[best
]);
119 return snd_soc_update_bits(codec
, WM8731_APDIGI
, 0x6, val
);
122 static int wm8731_get_deemph(struct snd_kcontrol
*kcontrol
,
123 struct snd_ctl_elem_value
*ucontrol
)
125 struct snd_soc_codec
*codec
= snd_soc_kcontrol_codec(kcontrol
);
126 struct wm8731_priv
*wm8731
= snd_soc_codec_get_drvdata(codec
);
128 ucontrol
->value
.enumerated
.item
[0] = wm8731
->deemph
;
133 static int wm8731_put_deemph(struct snd_kcontrol
*kcontrol
,
134 struct snd_ctl_elem_value
*ucontrol
)
136 struct snd_soc_codec
*codec
= snd_soc_kcontrol_codec(kcontrol
);
137 struct wm8731_priv
*wm8731
= snd_soc_codec_get_drvdata(codec
);
138 int deemph
= ucontrol
->value
.enumerated
.item
[0];
144 mutex_lock(&wm8731
->lock
);
145 if (wm8731
->deemph
!= deemph
) {
146 wm8731
->deemph
= deemph
;
148 wm8731_set_deemph(codec
);
152 mutex_unlock(&wm8731
->lock
);
157 static const DECLARE_TLV_DB_SCALE(in_tlv
, -3450, 150, 0);
158 static const DECLARE_TLV_DB_SCALE(sidetone_tlv
, -1500, 300, 0);
159 static const DECLARE_TLV_DB_SCALE(out_tlv
, -12100, 100, 1);
160 static const DECLARE_TLV_DB_SCALE(mic_tlv
, 0, 2000, 0);
162 static const struct snd_kcontrol_new wm8731_snd_controls
[] = {
164 SOC_DOUBLE_R_TLV("Master Playback Volume", WM8731_LOUT1V
, WM8731_ROUT1V
,
166 SOC_DOUBLE_R("Master Playback ZC Switch", WM8731_LOUT1V
, WM8731_ROUT1V
,
169 SOC_DOUBLE_R_TLV("Capture Volume", WM8731_LINVOL
, WM8731_RINVOL
, 0, 31, 0,
171 SOC_DOUBLE_R("Line Capture Switch", WM8731_LINVOL
, WM8731_RINVOL
, 7, 1, 1),
173 SOC_SINGLE_TLV("Mic Boost Volume", WM8731_APANA
, 0, 1, 0, mic_tlv
),
174 SOC_SINGLE("Mic Capture Switch", WM8731_APANA
, 1, 1, 1),
176 SOC_SINGLE_TLV("Sidetone Playback Volume", WM8731_APANA
, 6, 3, 1,
179 SOC_SINGLE("ADC High Pass Filter Switch", WM8731_APDIGI
, 0, 1, 1),
180 SOC_SINGLE("Store DC Offset Switch", WM8731_APDIGI
, 4, 1, 0),
182 SOC_SINGLE_BOOL_EXT("Playback Deemphasis Switch", 0,
183 wm8731_get_deemph
, wm8731_put_deemph
),
187 static const struct snd_kcontrol_new wm8731_output_mixer_controls
[] = {
188 SOC_DAPM_SINGLE("Line Bypass Switch", WM8731_APANA
, 3, 1, 0),
189 SOC_DAPM_SINGLE("Mic Sidetone Switch", WM8731_APANA
, 5, 1, 0),
190 SOC_DAPM_SINGLE("HiFi Playback Switch", WM8731_APANA
, 4, 1, 0),
194 static const struct snd_kcontrol_new wm8731_input_mux_controls
=
195 SOC_DAPM_ENUM("Input Select", wm8731_insel_enum
);
197 static const struct snd_soc_dapm_widget wm8731_dapm_widgets
[] = {
198 SND_SOC_DAPM_SUPPLY("ACTIVE",WM8731_ACTIVE
, 0, 0, NULL
, 0),
199 SND_SOC_DAPM_SUPPLY("OSC", WM8731_PWR
, 5, 1, NULL
, 0),
200 SND_SOC_DAPM_MIXER("Output Mixer", WM8731_PWR
, 4, 1,
201 &wm8731_output_mixer_controls
[0],
202 ARRAY_SIZE(wm8731_output_mixer_controls
)),
203 SND_SOC_DAPM_DAC("DAC", "HiFi Playback", WM8731_PWR
, 3, 1),
204 SND_SOC_DAPM_OUTPUT("LOUT"),
205 SND_SOC_DAPM_OUTPUT("LHPOUT"),
206 SND_SOC_DAPM_OUTPUT("ROUT"),
207 SND_SOC_DAPM_OUTPUT("RHPOUT"),
208 SND_SOC_DAPM_ADC("ADC", "HiFi Capture", WM8731_PWR
, 2, 1),
209 SND_SOC_DAPM_MUX("Input Mux", SND_SOC_NOPM
, 0, 0, &wm8731_input_mux_controls
),
210 SND_SOC_DAPM_PGA("Line Input", WM8731_PWR
, 0, 1, NULL
, 0),
211 SND_SOC_DAPM_MICBIAS("Mic Bias", WM8731_PWR
, 1, 1),
212 SND_SOC_DAPM_INPUT("MICIN"),
213 SND_SOC_DAPM_INPUT("RLINEIN"),
214 SND_SOC_DAPM_INPUT("LLINEIN"),
217 static int wm8731_check_osc(struct snd_soc_dapm_widget
*source
,
218 struct snd_soc_dapm_widget
*sink
)
220 struct snd_soc_codec
*codec
= snd_soc_dapm_to_codec(source
->dapm
);
221 struct wm8731_priv
*wm8731
= snd_soc_codec_get_drvdata(codec
);
223 return wm8731
->sysclk_type
== WM8731_SYSCLK_XTAL
;
226 static const struct snd_soc_dapm_route wm8731_intercon
[] = {
227 {"DAC", NULL
, "OSC", wm8731_check_osc
},
228 {"ADC", NULL
, "OSC", wm8731_check_osc
},
229 {"DAC", NULL
, "ACTIVE"},
230 {"ADC", NULL
, "ACTIVE"},
233 {"Output Mixer", "Line Bypass Switch", "Line Input"},
234 {"Output Mixer", "HiFi Playback Switch", "DAC"},
235 {"Output Mixer", "Mic Sidetone Switch", "Mic Bias"},
238 {"RHPOUT", NULL
, "Output Mixer"},
239 {"ROUT", NULL
, "Output Mixer"},
240 {"LHPOUT", NULL
, "Output Mixer"},
241 {"LOUT", NULL
, "Output Mixer"},
244 {"Input Mux", "Line In", "Line Input"},
245 {"Input Mux", "Mic", "Mic Bias"},
246 {"ADC", NULL
, "Input Mux"},
249 {"Line Input", NULL
, "LLINEIN"},
250 {"Line Input", NULL
, "RLINEIN"},
251 {"Mic Bias", NULL
, "MICIN"},
263 /* codec mclk clock divider coefficients */
264 static const struct _coeff_div coeff_div
[] = {
266 {12288000, 48000, 256, 0x0, 0x0, 0x0},
267 {18432000, 48000, 384, 0x0, 0x1, 0x0},
268 {12000000, 48000, 250, 0x0, 0x0, 0x1},
271 {12288000, 32000, 384, 0x6, 0x0, 0x0},
272 {18432000, 32000, 576, 0x6, 0x1, 0x0},
273 {12000000, 32000, 375, 0x6, 0x0, 0x1},
276 {12288000, 8000, 1536, 0x3, 0x0, 0x0},
277 {18432000, 8000, 2304, 0x3, 0x1, 0x0},
278 {11289600, 8000, 1408, 0xb, 0x0, 0x0},
279 {16934400, 8000, 2112, 0xb, 0x1, 0x0},
280 {12000000, 8000, 1500, 0x3, 0x0, 0x1},
283 {12288000, 96000, 128, 0x7, 0x0, 0x0},
284 {18432000, 96000, 192, 0x7, 0x1, 0x0},
285 {12000000, 96000, 125, 0x7, 0x0, 0x1},
288 {11289600, 44100, 256, 0x8, 0x0, 0x0},
289 {16934400, 44100, 384, 0x8, 0x1, 0x0},
290 {12000000, 44100, 272, 0x8, 0x1, 0x1},
293 {11289600, 88200, 128, 0xf, 0x0, 0x0},
294 {16934400, 88200, 192, 0xf, 0x1, 0x0},
295 {12000000, 88200, 136, 0xf, 0x1, 0x1},
298 /* rates constraints */
299 static const unsigned int wm8731_rates_12000000
[] = {
300 8000, 32000, 44100, 48000, 96000, 88200,
303 static const unsigned int wm8731_rates_12288000_18432000
[] = {
304 8000, 32000, 48000, 96000,
307 static const unsigned int wm8731_rates_11289600_16934400
[] = {
311 static const struct snd_pcm_hw_constraint_list wm8731_constraints_12000000
= {
312 .list
= wm8731_rates_12000000
,
313 .count
= ARRAY_SIZE(wm8731_rates_12000000
),
317 struct snd_pcm_hw_constraint_list wm8731_constraints_12288000_18432000
= {
318 .list
= wm8731_rates_12288000_18432000
,
319 .count
= ARRAY_SIZE(wm8731_rates_12288000_18432000
),
323 struct snd_pcm_hw_constraint_list wm8731_constraints_11289600_16934400
= {
324 .list
= wm8731_rates_11289600_16934400
,
325 .count
= ARRAY_SIZE(wm8731_rates_11289600_16934400
),
328 static inline int get_coeff(int mclk
, int rate
)
332 for (i
= 0; i
< ARRAY_SIZE(coeff_div
); i
++) {
333 if (coeff_div
[i
].rate
== rate
&& coeff_div
[i
].mclk
== mclk
)
339 static int wm8731_hw_params(struct snd_pcm_substream
*substream
,
340 struct snd_pcm_hw_params
*params
,
341 struct snd_soc_dai
*dai
)
343 struct snd_soc_codec
*codec
= dai
->codec
;
344 struct wm8731_priv
*wm8731
= snd_soc_codec_get_drvdata(codec
);
345 u16 iface
= snd_soc_read(codec
, WM8731_IFACE
) & 0xfff3;
346 int i
= get_coeff(wm8731
->sysclk
, params_rate(params
));
347 u16 srate
= (coeff_div
[i
].sr
<< 2) |
348 (coeff_div
[i
].bosr
<< 1) | coeff_div
[i
].usb
;
350 wm8731
->playback_fs
= params_rate(params
);
352 snd_soc_write(codec
, WM8731_SRATE
, srate
);
355 switch (params_width(params
)) {
366 wm8731_set_deemph(codec
);
368 snd_soc_write(codec
, WM8731_IFACE
, iface
);
372 static int wm8731_mute(struct snd_soc_dai
*dai
, int mute
)
374 struct snd_soc_codec
*codec
= dai
->codec
;
375 u16 mute_reg
= snd_soc_read(codec
, WM8731_APDIGI
) & 0xfff7;
378 snd_soc_write(codec
, WM8731_APDIGI
, mute_reg
| 0x8);
380 snd_soc_write(codec
, WM8731_APDIGI
, mute_reg
);
384 static int wm8731_set_dai_sysclk(struct snd_soc_dai
*codec_dai
,
385 int clk_id
, unsigned int freq
, int dir
)
387 struct snd_soc_codec
*codec
= codec_dai
->codec
;
388 struct wm8731_priv
*wm8731
= snd_soc_codec_get_drvdata(codec
);
391 case WM8731_SYSCLK_XTAL
:
392 case WM8731_SYSCLK_MCLK
:
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(&codec
->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 case SND_SOC_BIAS_PREPARE
:
497 case SND_SOC_BIAS_STANDBY
:
498 if (codec
->dapm
.bias_level
== SND_SOC_BIAS_OFF
) {
499 ret
= regulator_bulk_enable(ARRAY_SIZE(wm8731
->supplies
),
504 regcache_sync(wm8731
->regmap
);
507 /* Clear PWROFF, gate CLKOUT, everything else as-is */
508 reg
= snd_soc_read(codec
, WM8731_PWR
) & 0xff7f;
509 snd_soc_write(codec
, WM8731_PWR
, reg
| 0x0040);
511 case SND_SOC_BIAS_OFF
:
512 snd_soc_write(codec
, WM8731_PWR
, 0xffff);
513 regulator_bulk_disable(ARRAY_SIZE(wm8731
->supplies
),
515 regcache_mark_dirty(wm8731
->regmap
);
518 codec
->dapm
.bias_level
= level
;
522 static int wm8731_startup(struct snd_pcm_substream
*substream
,
523 struct snd_soc_dai
*dai
)
525 struct wm8731_priv
*wm8731
= snd_soc_codec_get_drvdata(dai
->codec
);
527 if (wm8731
->constraints
)
528 snd_pcm_hw_constraint_list(substream
->runtime
, 0,
529 SNDRV_PCM_HW_PARAM_RATE
,
530 wm8731
->constraints
);
535 #define WM8731_RATES SNDRV_PCM_RATE_8000_96000
537 #define WM8731_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
538 SNDRV_PCM_FMTBIT_S24_LE)
540 static const struct snd_soc_dai_ops wm8731_dai_ops
= {
541 .startup
= wm8731_startup
,
542 .hw_params
= wm8731_hw_params
,
543 .digital_mute
= wm8731_mute
,
544 .set_sysclk
= wm8731_set_dai_sysclk
,
545 .set_fmt
= wm8731_set_dai_fmt
,
548 static struct snd_soc_dai_driver wm8731_dai
= {
549 .name
= "wm8731-hifi",
551 .stream_name
= "Playback",
554 .rates
= WM8731_RATES
,
555 .formats
= WM8731_FORMATS
,},
557 .stream_name
= "Capture",
560 .rates
= WM8731_RATES
,
561 .formats
= WM8731_FORMATS
,},
562 .ops
= &wm8731_dai_ops
,
563 .symmetric_rates
= 1,
566 static int wm8731_probe(struct snd_soc_codec
*codec
)
568 struct wm8731_priv
*wm8731
= snd_soc_codec_get_drvdata(codec
);
571 for (i
= 0; i
< ARRAY_SIZE(wm8731
->supplies
); i
++)
572 wm8731
->supplies
[i
].supply
= wm8731_supply_names
[i
];
574 ret
= devm_regulator_bulk_get(codec
->dev
, ARRAY_SIZE(wm8731
->supplies
),
577 dev_err(codec
->dev
, "Failed to request supplies: %d\n", ret
);
581 ret
= regulator_bulk_enable(ARRAY_SIZE(wm8731
->supplies
),
584 dev_err(codec
->dev
, "Failed to enable supplies: %d\n", ret
);
588 ret
= wm8731_reset(codec
);
590 dev_err(codec
->dev
, "Failed to issue reset: %d\n", ret
);
591 goto err_regulator_enable
;
594 wm8731_set_bias_level(codec
, SND_SOC_BIAS_STANDBY
);
596 /* Latch the update bits */
597 snd_soc_update_bits(codec
, WM8731_LOUT1V
, 0x100, 0);
598 snd_soc_update_bits(codec
, WM8731_ROUT1V
, 0x100, 0);
599 snd_soc_update_bits(codec
, WM8731_LINVOL
, 0x100, 0);
600 snd_soc_update_bits(codec
, WM8731_RINVOL
, 0x100, 0);
602 /* Disable bypass path by default */
603 snd_soc_update_bits(codec
, WM8731_APANA
, 0x8, 0);
605 /* Regulators will have been enabled by bias management */
606 regulator_bulk_disable(ARRAY_SIZE(wm8731
->supplies
), wm8731
->supplies
);
610 err_regulator_enable
:
611 regulator_bulk_disable(ARRAY_SIZE(wm8731
->supplies
), wm8731
->supplies
);
616 /* power down chip */
617 static int wm8731_remove(struct snd_soc_codec
*codec
)
619 struct wm8731_priv
*wm8731
= snd_soc_codec_get_drvdata(codec
);
621 regulator_bulk_disable(ARRAY_SIZE(wm8731
->supplies
), wm8731
->supplies
);
626 static struct snd_soc_codec_driver soc_codec_dev_wm8731
= {
627 .probe
= wm8731_probe
,
628 .remove
= wm8731_remove
,
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
,
653 .writeable_reg
= wm8731_writeable
,
655 .cache_type
= REGCACHE_RBTREE
,
656 .reg_defaults
= wm8731_reg_defaults
,
657 .num_reg_defaults
= ARRAY_SIZE(wm8731_reg_defaults
),
660 #if defined(CONFIG_SPI_MASTER)
661 static int wm8731_spi_probe(struct spi_device
*spi
)
663 struct wm8731_priv
*wm8731
;
666 wm8731
= devm_kzalloc(&spi
->dev
, sizeof(*wm8731
), GFP_KERNEL
);
670 mutex_init(&wm8731
->lock
);
672 wm8731
->regmap
= devm_regmap_init_spi(spi
, &wm8731_regmap
);
673 if (IS_ERR(wm8731
->regmap
)) {
674 ret
= PTR_ERR(wm8731
->regmap
);
675 dev_err(&spi
->dev
, "Failed to allocate register map: %d\n",
680 spi_set_drvdata(spi
, wm8731
);
682 ret
= snd_soc_register_codec(&spi
->dev
,
683 &soc_codec_dev_wm8731
, &wm8731_dai
, 1);
685 dev_err(&spi
->dev
, "Failed to register CODEC: %d\n", ret
);
692 static int wm8731_spi_remove(struct spi_device
*spi
)
694 snd_soc_unregister_codec(&spi
->dev
);
698 static struct spi_driver wm8731_spi_driver
= {
701 .owner
= THIS_MODULE
,
702 .of_match_table
= wm8731_of_match
,
704 .probe
= wm8731_spi_probe
,
705 .remove
= wm8731_spi_remove
,
707 #endif /* CONFIG_SPI_MASTER */
709 #if IS_ENABLED(CONFIG_I2C)
710 static int wm8731_i2c_probe(struct i2c_client
*i2c
,
711 const struct i2c_device_id
*id
)
713 struct wm8731_priv
*wm8731
;
716 wm8731
= devm_kzalloc(&i2c
->dev
, sizeof(struct wm8731_priv
),
721 mutex_init(&wm8731
->lock
);
723 wm8731
->regmap
= devm_regmap_init_i2c(i2c
, &wm8731_regmap
);
724 if (IS_ERR(wm8731
->regmap
)) {
725 ret
= PTR_ERR(wm8731
->regmap
);
726 dev_err(&i2c
->dev
, "Failed to allocate register map: %d\n",
731 i2c_set_clientdata(i2c
, wm8731
);
733 ret
= snd_soc_register_codec(&i2c
->dev
,
734 &soc_codec_dev_wm8731
, &wm8731_dai
, 1);
736 dev_err(&i2c
->dev
, "Failed to register CODEC: %d\n", ret
);
743 static int wm8731_i2c_remove(struct i2c_client
*client
)
745 snd_soc_unregister_codec(&client
->dev
);
749 static const struct i2c_device_id wm8731_i2c_id
[] = {
753 MODULE_DEVICE_TABLE(i2c
, wm8731_i2c_id
);
755 static struct i2c_driver wm8731_i2c_driver
= {
758 .owner
= THIS_MODULE
,
759 .of_match_table
= wm8731_of_match
,
761 .probe
= wm8731_i2c_probe
,
762 .remove
= wm8731_i2c_remove
,
763 .id_table
= wm8731_i2c_id
,
767 static int __init
wm8731_modinit(void)
770 #if IS_ENABLED(CONFIG_I2C)
771 ret
= i2c_add_driver(&wm8731_i2c_driver
);
773 printk(KERN_ERR
"Failed to register WM8731 I2C driver: %d\n",
777 #if defined(CONFIG_SPI_MASTER)
778 ret
= spi_register_driver(&wm8731_spi_driver
);
780 printk(KERN_ERR
"Failed to register WM8731 SPI driver: %d\n",
786 module_init(wm8731_modinit
);
788 static void __exit
wm8731_exit(void)
790 #if IS_ENABLED(CONFIG_I2C)
791 i2c_del_driver(&wm8731_i2c_driver
);
793 #if defined(CONFIG_SPI_MASTER)
794 spi_unregister_driver(&wm8731_spi_driver
);
797 module_exit(wm8731_exit
);
799 MODULE_DESCRIPTION("ASoC WM8731 driver");
800 MODULE_AUTHOR("Richard Purdie");
801 MODULE_LICENSE("GPL");