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>
32 static struct snd_soc_codec
*wm8731_codec
;
33 struct snd_soc_codec_device soc_codec_dev_wm8731
;
35 /* codec private data */
37 struct snd_soc_codec codec
;
38 u16 reg_cache
[WM8731_CACHEREGNUM
];
42 #ifdef CONFIG_SPI_MASTER
43 static int wm8731_spi_write(struct spi_device
*spi
, const char *data
, int len
);
47 * wm8731 register cache
48 * We can't read the WM8731 register space when we are
49 * using 2 wire for device control, so we cache them instead.
50 * There is no point in caching the reset register
52 static const u16 wm8731_reg
[WM8731_CACHEREGNUM
] = {
53 0x0097, 0x0097, 0x0079, 0x0079,
54 0x000a, 0x0008, 0x009f, 0x000a,
58 #define wm8731_reset(c) snd_soc_write(c, WM8731_RESET, 0)
60 static const char *wm8731_input_select
[] = {"Line In", "Mic"};
61 static const char *wm8731_deemph
[] = {"None", "32Khz", "44.1Khz", "48Khz"};
63 static const struct soc_enum wm8731_enum
[] = {
64 SOC_ENUM_SINGLE(WM8731_APANA
, 2, 2, wm8731_input_select
),
65 SOC_ENUM_SINGLE(WM8731_APDIGI
, 1, 4, wm8731_deemph
),
68 static const struct snd_kcontrol_new wm8731_snd_controls
[] = {
70 SOC_DOUBLE_R("Master Playback Volume", WM8731_LOUT1V
, WM8731_ROUT1V
,
72 SOC_DOUBLE_R("Master Playback ZC Switch", WM8731_LOUT1V
, WM8731_ROUT1V
,
75 SOC_DOUBLE_R("Capture Volume", WM8731_LINVOL
, WM8731_RINVOL
, 0, 31, 0),
76 SOC_DOUBLE_R("Line Capture Switch", WM8731_LINVOL
, WM8731_RINVOL
, 7, 1, 1),
78 SOC_SINGLE("Mic Boost (+20dB)", WM8731_APANA
, 0, 1, 0),
79 SOC_SINGLE("Capture Mic Switch", WM8731_APANA
, 1, 1, 1),
81 SOC_SINGLE("Sidetone Playback Volume", WM8731_APANA
, 6, 3, 1),
83 SOC_SINGLE("ADC High Pass Filter Switch", WM8731_APDIGI
, 0, 1, 1),
84 SOC_SINGLE("Store DC Offset Switch", WM8731_APDIGI
, 4, 1, 0),
86 SOC_ENUM("Playback De-emphasis", wm8731_enum
[1]),
90 static const struct snd_kcontrol_new wm8731_output_mixer_controls
[] = {
91 SOC_DAPM_SINGLE("Line Bypass Switch", WM8731_APANA
, 3, 1, 0),
92 SOC_DAPM_SINGLE("Mic Sidetone Switch", WM8731_APANA
, 5, 1, 0),
93 SOC_DAPM_SINGLE("HiFi Playback Switch", WM8731_APANA
, 4, 1, 0),
97 static const struct snd_kcontrol_new wm8731_input_mux_controls
=
98 SOC_DAPM_ENUM("Input Select", wm8731_enum
[0]);
100 static const struct snd_soc_dapm_widget wm8731_dapm_widgets
[] = {
101 SND_SOC_DAPM_MIXER("Output Mixer", WM8731_PWR
, 4, 1,
102 &wm8731_output_mixer_controls
[0],
103 ARRAY_SIZE(wm8731_output_mixer_controls
)),
104 SND_SOC_DAPM_DAC("DAC", "HiFi Playback", WM8731_PWR
, 3, 1),
105 SND_SOC_DAPM_OUTPUT("LOUT"),
106 SND_SOC_DAPM_OUTPUT("LHPOUT"),
107 SND_SOC_DAPM_OUTPUT("ROUT"),
108 SND_SOC_DAPM_OUTPUT("RHPOUT"),
109 SND_SOC_DAPM_ADC("ADC", "HiFi Capture", WM8731_PWR
, 2, 1),
110 SND_SOC_DAPM_MUX("Input Mux", SND_SOC_NOPM
, 0, 0, &wm8731_input_mux_controls
),
111 SND_SOC_DAPM_PGA("Line Input", WM8731_PWR
, 0, 1, NULL
, 0),
112 SND_SOC_DAPM_MICBIAS("Mic Bias", WM8731_PWR
, 1, 1),
113 SND_SOC_DAPM_INPUT("MICIN"),
114 SND_SOC_DAPM_INPUT("RLINEIN"),
115 SND_SOC_DAPM_INPUT("LLINEIN"),
118 static const struct snd_soc_dapm_route intercon
[] = {
120 {"Output Mixer", "Line Bypass Switch", "Line Input"},
121 {"Output Mixer", "HiFi Playback Switch", "DAC"},
122 {"Output Mixer", "Mic Sidetone Switch", "Mic Bias"},
125 {"RHPOUT", NULL
, "Output Mixer"},
126 {"ROUT", NULL
, "Output Mixer"},
127 {"LHPOUT", NULL
, "Output Mixer"},
128 {"LOUT", NULL
, "Output Mixer"},
131 {"Input Mux", "Line In", "Line Input"},
132 {"Input Mux", "Mic", "Mic Bias"},
133 {"ADC", NULL
, "Input Mux"},
136 {"Line Input", NULL
, "LLINEIN"},
137 {"Line Input", NULL
, "RLINEIN"},
138 {"Mic Bias", NULL
, "MICIN"},
141 static int wm8731_add_widgets(struct snd_soc_codec
*codec
)
143 snd_soc_dapm_new_controls(codec
, wm8731_dapm_widgets
,
144 ARRAY_SIZE(wm8731_dapm_widgets
));
146 snd_soc_dapm_add_routes(codec
, intercon
, ARRAY_SIZE(intercon
));
148 snd_soc_dapm_new_widgets(codec
);
161 /* codec mclk clock divider coefficients */
162 static const struct _coeff_div coeff_div
[] = {
164 {12288000, 48000, 256, 0x0, 0x0, 0x0},
165 {18432000, 48000, 384, 0x0, 0x1, 0x0},
166 {12000000, 48000, 250, 0x0, 0x0, 0x1},
169 {12288000, 32000, 384, 0x6, 0x0, 0x0},
170 {18432000, 32000, 576, 0x6, 0x1, 0x0},
171 {12000000, 32000, 375, 0x6, 0x0, 0x1},
174 {12288000, 8000, 1536, 0x3, 0x0, 0x0},
175 {18432000, 8000, 2304, 0x3, 0x1, 0x0},
176 {11289600, 8000, 1408, 0xb, 0x0, 0x0},
177 {16934400, 8000, 2112, 0xb, 0x1, 0x0},
178 {12000000, 8000, 1500, 0x3, 0x0, 0x1},
181 {12288000, 96000, 128, 0x7, 0x0, 0x0},
182 {18432000, 96000, 192, 0x7, 0x1, 0x0},
183 {12000000, 96000, 125, 0x7, 0x0, 0x1},
186 {11289600, 44100, 256, 0x8, 0x0, 0x0},
187 {16934400, 44100, 384, 0x8, 0x1, 0x0},
188 {12000000, 44100, 272, 0x8, 0x1, 0x1},
191 {11289600, 88200, 128, 0xf, 0x0, 0x0},
192 {16934400, 88200, 192, 0xf, 0x1, 0x0},
193 {12000000, 88200, 136, 0xf, 0x1, 0x1},
196 static inline int get_coeff(int mclk
, int rate
)
200 for (i
= 0; i
< ARRAY_SIZE(coeff_div
); i
++) {
201 if (coeff_div
[i
].rate
== rate
&& coeff_div
[i
].mclk
== mclk
)
207 static int wm8731_hw_params(struct snd_pcm_substream
*substream
,
208 struct snd_pcm_hw_params
*params
,
209 struct snd_soc_dai
*dai
)
211 struct snd_soc_pcm_runtime
*rtd
= substream
->private_data
;
212 struct snd_soc_device
*socdev
= rtd
->socdev
;
213 struct snd_soc_codec
*codec
= socdev
->card
->codec
;
214 struct wm8731_priv
*wm8731
= codec
->private_data
;
215 u16 iface
= snd_soc_read(codec
, WM8731_IFACE
) & 0xfff3;
216 int i
= get_coeff(wm8731
->sysclk
, params_rate(params
));
217 u16 srate
= (coeff_div
[i
].sr
<< 2) |
218 (coeff_div
[i
].bosr
<< 1) | coeff_div
[i
].usb
;
220 snd_soc_write(codec
, WM8731_SRATE
, srate
);
223 switch (params_format(params
)) {
224 case SNDRV_PCM_FORMAT_S16_LE
:
226 case SNDRV_PCM_FORMAT_S20_3LE
:
229 case SNDRV_PCM_FORMAT_S24_LE
:
234 snd_soc_write(codec
, WM8731_IFACE
, iface
);
238 static int wm8731_pcm_prepare(struct snd_pcm_substream
*substream
,
239 struct snd_soc_dai
*dai
)
241 struct snd_soc_pcm_runtime
*rtd
= substream
->private_data
;
242 struct snd_soc_device
*socdev
= rtd
->socdev
;
243 struct snd_soc_codec
*codec
= socdev
->card
->codec
;
246 snd_soc_write(codec
, WM8731_ACTIVE
, 0x0001);
251 static void wm8731_shutdown(struct snd_pcm_substream
*substream
,
252 struct snd_soc_dai
*dai
)
254 struct snd_soc_pcm_runtime
*rtd
= substream
->private_data
;
255 struct snd_soc_device
*socdev
= rtd
->socdev
;
256 struct snd_soc_codec
*codec
= socdev
->card
->codec
;
259 if (!codec
->active
) {
261 snd_soc_write(codec
, WM8731_ACTIVE
, 0x0);
265 static int wm8731_mute(struct snd_soc_dai
*dai
, int mute
)
267 struct snd_soc_codec
*codec
= dai
->codec
;
268 u16 mute_reg
= snd_soc_read(codec
, WM8731_APDIGI
) & 0xfff7;
271 snd_soc_write(codec
, WM8731_APDIGI
, mute_reg
| 0x8);
273 snd_soc_write(codec
, WM8731_APDIGI
, mute_reg
);
277 static int wm8731_set_dai_sysclk(struct snd_soc_dai
*codec_dai
,
278 int clk_id
, unsigned int freq
, int dir
)
280 struct snd_soc_codec
*codec
= codec_dai
->codec
;
281 struct wm8731_priv
*wm8731
= codec
->private_data
;
289 wm8731
->sysclk
= freq
;
296 static int wm8731_set_dai_fmt(struct snd_soc_dai
*codec_dai
,
299 struct snd_soc_codec
*codec
= codec_dai
->codec
;
302 /* set master/slave audio interface */
303 switch (fmt
& SND_SOC_DAIFMT_MASTER_MASK
) {
304 case SND_SOC_DAIFMT_CBM_CFM
:
307 case SND_SOC_DAIFMT_CBS_CFS
:
313 /* interface format */
314 switch (fmt
& SND_SOC_DAIFMT_FORMAT_MASK
) {
315 case SND_SOC_DAIFMT_I2S
:
318 case SND_SOC_DAIFMT_RIGHT_J
:
320 case SND_SOC_DAIFMT_LEFT_J
:
323 case SND_SOC_DAIFMT_DSP_A
:
326 case SND_SOC_DAIFMT_DSP_B
:
333 /* clock inversion */
334 switch (fmt
& SND_SOC_DAIFMT_INV_MASK
) {
335 case SND_SOC_DAIFMT_NB_NF
:
337 case SND_SOC_DAIFMT_IB_IF
:
340 case SND_SOC_DAIFMT_IB_NF
:
343 case SND_SOC_DAIFMT_NB_IF
:
351 snd_soc_write(codec
, WM8731_IFACE
, iface
);
355 static int wm8731_set_bias_level(struct snd_soc_codec
*codec
,
356 enum snd_soc_bias_level level
)
361 case SND_SOC_BIAS_ON
:
363 case SND_SOC_BIAS_PREPARE
:
365 case SND_SOC_BIAS_STANDBY
:
366 /* Clear PWROFF, gate CLKOUT, everything else as-is */
367 reg
= snd_soc_read(codec
, WM8731_PWR
) & 0xff7f;
368 snd_soc_write(codec
, WM8731_PWR
, reg
| 0x0040);
370 case SND_SOC_BIAS_OFF
:
371 snd_soc_write(codec
, WM8731_ACTIVE
, 0x0);
372 snd_soc_write(codec
, WM8731_PWR
, 0xffff);
375 codec
->bias_level
= level
;
379 #define WM8731_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
380 SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 |\
381 SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |\
382 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |\
383 SNDRV_PCM_RATE_96000)
385 #define WM8731_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
386 SNDRV_PCM_FMTBIT_S24_LE)
388 static struct snd_soc_dai_ops wm8731_dai_ops
= {
389 .prepare
= wm8731_pcm_prepare
,
390 .hw_params
= wm8731_hw_params
,
391 .shutdown
= wm8731_shutdown
,
392 .digital_mute
= wm8731_mute
,
393 .set_sysclk
= wm8731_set_dai_sysclk
,
394 .set_fmt
= wm8731_set_dai_fmt
,
397 struct snd_soc_dai wm8731_dai
= {
400 .stream_name
= "Playback",
403 .rates
= WM8731_RATES
,
404 .formats
= WM8731_FORMATS
,},
406 .stream_name
= "Capture",
409 .rates
= WM8731_RATES
,
410 .formats
= WM8731_FORMATS
,},
411 .ops
= &wm8731_dai_ops
,
413 EXPORT_SYMBOL_GPL(wm8731_dai
);
416 static int wm8731_suspend(struct platform_device
*pdev
, pm_message_t state
)
418 struct snd_soc_device
*socdev
= platform_get_drvdata(pdev
);
419 struct snd_soc_codec
*codec
= socdev
->card
->codec
;
421 snd_soc_write(codec
, WM8731_ACTIVE
, 0x0);
422 wm8731_set_bias_level(codec
, SND_SOC_BIAS_OFF
);
426 static int wm8731_resume(struct platform_device
*pdev
)
428 struct snd_soc_device
*socdev
= platform_get_drvdata(pdev
);
429 struct snd_soc_codec
*codec
= socdev
->card
->codec
;
432 u16
*cache
= codec
->reg_cache
;
434 /* Sync reg_cache with the hardware */
435 for (i
= 0; i
< ARRAY_SIZE(wm8731_reg
); i
++) {
436 data
[0] = (i
<< 1) | ((cache
[i
] >> 8) & 0x0001);
437 data
[1] = cache
[i
] & 0x00ff;
438 codec
->hw_write(codec
->control_data
, data
, 2);
440 wm8731_set_bias_level(codec
, SND_SOC_BIAS_STANDBY
);
441 wm8731_set_bias_level(codec
, codec
->suspend_bias_level
);
445 #define wm8731_suspend NULL
446 #define wm8731_resume NULL
449 static int wm8731_probe(struct platform_device
*pdev
)
451 struct snd_soc_device
*socdev
= platform_get_drvdata(pdev
);
452 struct snd_soc_codec
*codec
;
455 if (wm8731_codec
== NULL
) {
456 dev_err(&pdev
->dev
, "Codec device not registered\n");
460 socdev
->card
->codec
= wm8731_codec
;
461 codec
= wm8731_codec
;
464 ret
= snd_soc_new_pcms(socdev
, SNDRV_DEFAULT_IDX1
, SNDRV_DEFAULT_STR1
);
466 dev_err(codec
->dev
, "failed to create pcms: %d\n", ret
);
470 snd_soc_add_controls(codec
, wm8731_snd_controls
,
471 ARRAY_SIZE(wm8731_snd_controls
));
472 wm8731_add_widgets(codec
);
473 ret
= snd_soc_init_card(socdev
);
475 dev_err(codec
->dev
, "failed to register card: %d\n", ret
);
482 snd_soc_free_pcms(socdev
);
483 snd_soc_dapm_free(socdev
);
488 /* power down chip */
489 static int wm8731_remove(struct platform_device
*pdev
)
491 struct snd_soc_device
*socdev
= platform_get_drvdata(pdev
);
493 snd_soc_free_pcms(socdev
);
494 snd_soc_dapm_free(socdev
);
499 struct snd_soc_codec_device soc_codec_dev_wm8731
= {
500 .probe
= wm8731_probe
,
501 .remove
= wm8731_remove
,
502 .suspend
= wm8731_suspend
,
503 .resume
= wm8731_resume
,
505 EXPORT_SYMBOL_GPL(soc_codec_dev_wm8731
);
507 static int wm8731_register(struct wm8731_priv
*wm8731
,
508 enum snd_soc_control_type control
)
511 struct snd_soc_codec
*codec
= &wm8731
->codec
;
514 dev_err(codec
->dev
, "Another WM8731 is registered\n");
519 mutex_init(&codec
->mutex
);
520 INIT_LIST_HEAD(&codec
->dapm_widgets
);
521 INIT_LIST_HEAD(&codec
->dapm_paths
);
523 codec
->private_data
= wm8731
;
524 codec
->name
= "WM8731";
525 codec
->owner
= THIS_MODULE
;
526 codec
->bias_level
= SND_SOC_BIAS_OFF
;
527 codec
->set_bias_level
= wm8731_set_bias_level
;
528 codec
->dai
= &wm8731_dai
;
530 codec
->reg_cache_size
= WM8731_CACHEREGNUM
;
531 codec
->reg_cache
= &wm8731
->reg_cache
;
533 memcpy(codec
->reg_cache
, wm8731_reg
, sizeof(wm8731_reg
));
535 ret
= snd_soc_codec_set_cache_io(codec
, 7, 9, control
);
537 dev_err(codec
->dev
, "Failed to set cache I/O: %d\n", ret
);
541 ret
= wm8731_reset(codec
);
543 dev_err(codec
->dev
, "Failed to issue reset: %d\n", ret
);
547 wm8731_dai
.dev
= codec
->dev
;
549 wm8731_set_bias_level(codec
, SND_SOC_BIAS_STANDBY
);
551 /* Latch the update bits */
552 snd_soc_update_bits(codec
, WM8731_LOUT1V
, 0x100, 0);
553 snd_soc_update_bits(codec
, WM8731_ROUT1V
, 0x100, 0);
554 snd_soc_update_bits(codec
, WM8731_LINVOL
, 0x100, 0);
555 snd_soc_update_bits(codec
, WM8731_RINVOL
, 0x100, 0);
557 /* Disable bypass path by default */
558 snd_soc_update_bits(codec
, WM8731_APANA
, 0x4, 0);
560 wm8731_codec
= codec
;
562 ret
= snd_soc_register_codec(codec
);
564 dev_err(codec
->dev
, "Failed to register codec: %d\n", ret
);
568 ret
= snd_soc_register_dai(&wm8731_dai
);
570 dev_err(codec
->dev
, "Failed to register DAI: %d\n", ret
);
571 snd_soc_unregister_codec(codec
);
578 snd_soc_unregister_codec(codec
);
584 static void wm8731_unregister(struct wm8731_priv
*wm8731
)
586 wm8731_set_bias_level(&wm8731
->codec
, SND_SOC_BIAS_OFF
);
587 snd_soc_unregister_dai(&wm8731_dai
);
588 snd_soc_unregister_codec(&wm8731
->codec
);
593 #if defined(CONFIG_SPI_MASTER)
594 static int wm8731_spi_write(struct spi_device
*spi
, const char *data
, int len
)
596 struct spi_transfer t
;
597 struct spi_message m
;
606 spi_message_init(&m
);
607 memset(&t
, 0, (sizeof t
));
612 spi_message_add_tail(&t
, &m
);
618 static int __devinit
wm8731_spi_probe(struct spi_device
*spi
)
620 struct snd_soc_codec
*codec
;
621 struct wm8731_priv
*wm8731
;
623 wm8731
= kzalloc(sizeof(struct wm8731_priv
), GFP_KERNEL
);
627 codec
= &wm8731
->codec
;
628 codec
->control_data
= spi
;
629 codec
->hw_write
= (hw_write_t
)wm8731_spi_write
;
630 codec
->dev
= &spi
->dev
;
632 dev_set_drvdata(&spi
->dev
, wm8731
);
634 return wm8731_register(wm8731
, SND_SOC_SPI
);
637 static int __devexit
wm8731_spi_remove(struct spi_device
*spi
)
639 struct wm8731_priv
*wm8731
= dev_get_drvdata(&spi
->dev
);
641 wm8731_unregister(wm8731
);
647 static int wm8731_spi_suspend(struct spi_device
*spi
, pm_message_t msg
)
649 return snd_soc_suspend_device(&spi
->dev
);
652 static int wm8731_spi_resume(struct spi_device
*spi
)
654 return snd_soc_resume_device(&spi
->dev
);
657 #define wm8731_spi_suspend NULL
658 #define wm8731_spi_resume NULL
661 static struct spi_driver wm8731_spi_driver
= {
664 .bus
= &spi_bus_type
,
665 .owner
= THIS_MODULE
,
667 .probe
= wm8731_spi_probe
,
668 .suspend
= wm8731_spi_suspend
,
669 .resume
= wm8731_spi_resume
,
670 .remove
= __devexit_p(wm8731_spi_remove
),
672 #endif /* CONFIG_SPI_MASTER */
674 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
675 static __devinit
int wm8731_i2c_probe(struct i2c_client
*i2c
,
676 const struct i2c_device_id
*id
)
678 struct wm8731_priv
*wm8731
;
679 struct snd_soc_codec
*codec
;
681 wm8731
= kzalloc(sizeof(struct wm8731_priv
), GFP_KERNEL
);
685 codec
= &wm8731
->codec
;
687 i2c_set_clientdata(i2c
, wm8731
);
688 codec
->control_data
= i2c
;
690 codec
->dev
= &i2c
->dev
;
692 return wm8731_register(wm8731
, SND_SOC_I2C
);
695 static __devexit
int wm8731_i2c_remove(struct i2c_client
*client
)
697 struct wm8731_priv
*wm8731
= i2c_get_clientdata(client
);
698 wm8731_unregister(wm8731
);
703 static int wm8731_i2c_suspend(struct i2c_client
*i2c
, pm_message_t msg
)
705 return snd_soc_suspend_device(&i2c
->dev
);
708 static int wm8731_i2c_resume(struct i2c_client
*i2c
)
710 return snd_soc_resume_device(&i2c
->dev
);
713 #define wm8731_i2c_suspend NULL
714 #define wm8731_i2c_resume NULL
717 static const struct i2c_device_id wm8731_i2c_id
[] = {
721 MODULE_DEVICE_TABLE(i2c
, wm8731_i2c_id
);
723 static struct i2c_driver wm8731_i2c_driver
= {
725 .name
= "WM8731 I2C Codec",
726 .owner
= THIS_MODULE
,
728 .probe
= wm8731_i2c_probe
,
729 .remove
= __devexit_p(wm8731_i2c_remove
),
730 .suspend
= wm8731_i2c_suspend
,
731 .resume
= wm8731_i2c_resume
,
732 .id_table
= wm8731_i2c_id
,
736 static int __init
wm8731_modinit(void)
739 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
740 ret
= i2c_add_driver(&wm8731_i2c_driver
);
742 printk(KERN_ERR
"Failed to register WM8731 I2C driver: %d\n",
746 #if defined(CONFIG_SPI_MASTER)
747 ret
= spi_register_driver(&wm8731_spi_driver
);
749 printk(KERN_ERR
"Failed to register WM8731 SPI driver: %d\n",
755 module_init(wm8731_modinit
);
757 static void __exit
wm8731_exit(void)
759 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
760 i2c_del_driver(&wm8731_i2c_driver
);
762 #if defined(CONFIG_SPI_MASTER)
763 spi_unregister_driver(&wm8731_spi_driver
);
766 module_exit(wm8731_exit
);
768 MODULE_DESCRIPTION("ASoC WM8731 driver");
769 MODULE_AUTHOR("Richard Purdie");
770 MODULE_LICENSE("GPL");