2 * File: sound/soc/codecs/ad1938.c
3 * Author: Barry Song <Barry.Song@analog.com>
5 * Created: June 04 2009
6 * Description: Driver for AD1938 sound chip
9 * Copyright 2009 Analog Devices Inc.
11 * Bugs: Enter bugs at http://blackfin.uclinux.org/
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, see the file COPYING, or write
25 * to the Free Software Foundation, Inc.,
26 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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>
43 /* codec private data */
45 struct snd_soc_codec codec
;
46 u8 reg_cache
[AD1938_NUM_REGS
];
49 static struct snd_soc_codec
*ad1938_codec
;
50 struct snd_soc_codec_device soc_codec_dev_ad1938
;
51 static int ad1938_register(struct ad1938_priv
*ad1938
);
52 static void ad1938_unregister(struct ad1938_priv
*ad1938
);
55 * AD1938 volume/mute/de-emphasis etc. controls
57 static const char *ad1938_deemp
[] = {"None", "48kHz", "44.1kHz", "32kHz"};
59 static const struct soc_enum ad1938_deemp_enum
=
60 SOC_ENUM_SINGLE(AD1938_DAC_CTRL2
, 1, 4, ad1938_deemp
);
62 static const struct snd_kcontrol_new ad1938_snd_controls
[] = {
63 /* DAC volume control */
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),
73 /* ADC switch control */
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),
79 /* DAC switch control */
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),
89 /* ADC high-pass filter */
90 SOC_SINGLE("ADC High Pass Filter Switch", AD1938_ADC_CTRL0
,
91 AD1938_ADC_HIGHPASS_FILTER
, 1, 0),
94 SOC_ENUM("Playback Deemphasis", ad1938_deemp_enum
),
97 static 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"),
109 static 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" },
124 static int ad1938_mute(struct snd_soc_dai
*dai
, int mute
)
126 struct snd_soc_codec
*codec
= dai
->codec
;
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
);
137 static inline int ad1938_pll_powerctrl(struct snd_soc_codec
*codec
, int cmd
)
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
);
147 static int ad1938_set_tdm_slot(struct snd_soc_dai
*dai
, unsigned int tx_mask
,
148 unsigned int mask
, int slots
, int width
)
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
);
154 dac_reg
&= ~AD1938_DAC_CHAN_MASK
;
155 adc_reg
&= ~AD1938_ADC_CHAN_MASK
;
159 dac_reg
|= AD1938_DAC_2_CHANNELS
<< AD1938_DAC_CHAN_SHFT
;
160 adc_reg
|= AD1938_ADC_2_CHANNELS
<< AD1938_ADC_CHAN_SHFT
;
163 dac_reg
|= AD1938_DAC_4_CHANNELS
<< AD1938_DAC_CHAN_SHFT
;
164 adc_reg
|= AD1938_ADC_4_CHANNELS
<< AD1938_ADC_CHAN_SHFT
;
167 dac_reg
|= AD1938_DAC_8_CHANNELS
<< AD1938_DAC_CHAN_SHFT
;
168 adc_reg
|= AD1938_ADC_8_CHANNELS
<< AD1938_ADC_CHAN_SHFT
;
171 dac_reg
|= AD1938_DAC_16_CHANNELS
<< AD1938_DAC_CHAN_SHFT
;
172 adc_reg
|= AD1938_ADC_16_CHANNELS
<< AD1938_ADC_CHAN_SHFT
;
178 codec
->write(codec
, AD1938_DAC_CTRL1
, dac_reg
);
179 codec
->write(codec
, AD1938_ADC_CTRL2
, adc_reg
);
184 static int ad1938_set_dai_fmt(struct snd_soc_dai
*codec_dai
,
187 struct snd_soc_codec
*codec
= codec_dai
->codec
;
188 int adc_reg
, dac_reg
;
190 adc_reg
= codec
->read(codec
, AD1938_ADC_CTRL2
);
191 dac_reg
= codec
->read(codec
, AD1938_DAC_CTRL1
);
193 /* At present, the driver only support AUX ADC mode(SND_SOC_DAIFMT_I2S
194 * with TDM) and ADC&DAC TDM mode(SND_SOC_DAIFMT_DSP_A)
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
;
201 case SND_SOC_DAIFMT_DSP_A
:
202 adc_reg
&= ~AD1938_ADC_SERFMT_MASK
;
203 adc_reg
|= AD1938_ADC_SERFMT_AUX
;
209 switch (fmt
& SND_SOC_DAIFMT_INV_MASK
) {
210 case SND_SOC_DAIFMT_NB_NF
: /* normal bit clock + frame */
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
;
216 case SND_SOC_DAIFMT_NB_IF
: /* normal bclk + invert frm */
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
;
222 case SND_SOC_DAIFMT_IB_NF
: /* invert bclk + normal frm */
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
;
229 case SND_SOC_DAIFMT_IB_IF
: /* invert bclk + frm */
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
;
239 switch (fmt
& SND_SOC_DAIFMT_MASTER_MASK
) {
240 case SND_SOC_DAIFMT_CBM_CFM
: /* codec clk & frm master */
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
;
246 case SND_SOC_DAIFMT_CBS_CFM
: /* codec clk slave & frm master */
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
;
252 case SND_SOC_DAIFMT_CBM_CFS
: /* codec clk master & frame slave */
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
;
258 case SND_SOC_DAIFMT_CBS_CFS
: /* codec clk & frm slave */
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
;
268 codec
->write(codec
, AD1938_ADC_CTRL2
, adc_reg
);
269 codec
->write(codec
, AD1938_DAC_CTRL1
, dac_reg
);
274 static int ad1938_hw_params(struct snd_pcm_substream
*substream
,
275 struct snd_pcm_hw_params
*params
,
276 struct snd_soc_dai
*dai
)
278 int word_len
= 0, reg
= 0;
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
;
285 switch (params_format(params
)) {
286 case SNDRV_PCM_FORMAT_S16_LE
:
289 case SNDRV_PCM_FORMAT_S20_3LE
:
292 case SNDRV_PCM_FORMAT_S24_LE
:
293 case SNDRV_PCM_FORMAT_S32_LE
:
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
);
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
);
309 static int ad1938_set_bias_level(struct snd_soc_codec
*codec
,
310 enum snd_soc_bias_level level
)
313 case SND_SOC_BIAS_ON
:
314 ad1938_pll_powerctrl(codec
, 1);
316 case SND_SOC_BIAS_PREPARE
:
318 case SND_SOC_BIAS_STANDBY
:
319 case SND_SOC_BIAS_OFF
:
320 ad1938_pll_powerctrl(codec
, 0);
323 codec
->bias_level
= level
;
328 * interface to read/write ad1938 register
331 #define AD1938_SPI_ADDR 0x4
332 #define AD1938_SPI_READ 0x1
333 #define AD1938_SPI_BUFLEN 3
336 * write to the ad1938 register space
339 static int ad1938_write_reg(struct snd_soc_codec
*codec
, unsigned int reg
,
342 u8
*reg_cache
= codec
->reg_cache
;
345 if (value
!= reg_cache
[reg
]) {
346 uint8_t buf
[AD1938_SPI_BUFLEN
];
347 struct spi_transfer t
= {
349 .len
= AD1938_SPI_BUFLEN
,
351 struct spi_message m
;
353 buf
[0] = AD1938_SPI_ADDR
<< 1;
356 spi_message_init(&m
);
357 spi_message_add_tail(&t
, &m
);
358 ret
= spi_sync(codec
->control_data
, &m
);
360 reg_cache
[reg
] = value
;
367 * read from the ad1938 register space cache
370 static unsigned int ad1938_read_reg_cache(struct snd_soc_codec
*codec
,
373 u8
*reg_cache
= codec
->reg_cache
;
375 if (reg
>= codec
->reg_cache_size
)
378 return reg_cache
[reg
];
382 * read from the ad1938 register space
385 static unsigned int ad1938_read_reg(struct snd_soc_codec
*codec
,
388 char w_buf
[AD1938_SPI_BUFLEN
];
389 char r_buf
[AD1938_SPI_BUFLEN
];
392 struct spi_transfer t
= {
395 .len
= AD1938_SPI_BUFLEN
,
397 struct spi_message m
;
399 w_buf
[0] = (AD1938_SPI_ADDR
<< 1) | AD1938_SPI_READ
;
403 spi_message_init(&m
);
404 spi_message_add_tail(&t
, &m
);
405 ret
= spi_sync(codec
->control_data
, &m
);
412 static int ad1938_fill_cache(struct snd_soc_codec
*codec
)
415 u8
*reg_cache
= codec
->reg_cache
;
416 struct spi_device
*spi
= codec
->control_data
;
418 for (i
= 0; i
< codec
->reg_cache_size
; i
++) {
419 int ret
= ad1938_read_reg(codec
, i
);
421 dev_err(&spi
->dev
, "AD1938 SPI read failure\n");
430 static int __devinit
ad1938_spi_probe(struct spi_device
*spi
)
432 struct snd_soc_codec
*codec
;
433 struct ad1938_priv
*ad1938
;
435 ad1938
= kzalloc(sizeof(struct ad1938_priv
), GFP_KERNEL
);
439 codec
= &ad1938
->codec
;
440 codec
->control_data
= spi
;
441 codec
->dev
= &spi
->dev
;
443 dev_set_drvdata(&spi
->dev
, ad1938
);
445 return ad1938_register(ad1938
);
448 static int __devexit
ad1938_spi_remove(struct spi_device
*spi
)
450 struct ad1938_priv
*ad1938
= dev_get_drvdata(&spi
->dev
);
452 ad1938_unregister(ad1938
);
456 static struct spi_driver ad1938_spi_driver
= {
459 .owner
= THIS_MODULE
,
461 .probe
= ad1938_spi_probe
,
462 .remove
= __devexit_p(ad1938_spi_remove
),
465 static 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
,
472 /* codec DAI instance */
473 struct snd_soc_dai ad1938_dai
= {
476 .stream_name
= "Playback",
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
,
484 .stream_name
= "Capture",
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
,
491 .ops
= &ad1938_dai_ops
,
493 EXPORT_SYMBOL_GPL(ad1938_dai
);
495 static int ad1938_register(struct ad1938_priv
*ad1938
)
498 struct snd_soc_codec
*codec
= &ad1938
->codec
;
501 dev_err(codec
->dev
, "Another ad1938 is registered\n");
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
;
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
);
521 ad1938_dai
.dev
= codec
->dev
;
522 ad1938_codec
= codec
;
524 /* default setting for ad1938 */
526 /* unmute dac channels */
527 codec
->write(codec
, AD1938_DAC_CHNL_MUTE
, 0x0);
528 /* de-emphasis: 48kHz, powedown dac */
529 codec
->write(codec
, AD1938_DAC_CTRL2
, 0x1A);
530 /* powerdown dac, dac in tdm mode */
531 codec
->write(codec
, AD1938_DAC_CTRL0
, 0x41);
532 /* high-pass filter enable */
533 codec
->write(codec
, AD1938_ADC_CTRL0
, 0x3);
534 /* sata delay=1, adc aux mode */
535 codec
->write(codec
, AD1938_ADC_CTRL1
, 0x43);
536 /* pll input: mclki/xi */
537 codec
->write(codec
, AD1938_PLL_CLK_CTRL0
, 0x9D);
538 codec
->write(codec
, AD1938_PLL_CLK_CTRL1
, 0x04);
540 ad1938_fill_cache(codec
);
542 ret
= snd_soc_register_codec(codec
);
544 dev_err(codec
->dev
, "Failed to register codec: %d\n", ret
);
549 ret
= snd_soc_register_dai(&ad1938_dai
);
551 dev_err(codec
->dev
, "Failed to register DAI: %d\n", ret
);
552 snd_soc_unregister_codec(codec
);
560 static void ad1938_unregister(struct ad1938_priv
*ad1938
)
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
);
569 static int ad1938_probe(struct platform_device
*pdev
)
571 struct snd_soc_device
*socdev
= platform_get_drvdata(pdev
);
572 struct snd_soc_codec
*codec
;
575 if (ad1938_codec
== NULL
) {
576 dev_err(&pdev
->dev
, "Codec device not registered\n");
580 socdev
->card
->codec
= ad1938_codec
;
581 codec
= ad1938_codec
;
584 ret
= snd_soc_new_pcms(socdev
, SNDRV_DEFAULT_IDX1
, SNDRV_DEFAULT_STR1
);
586 dev_err(codec
->dev
, "failed to create pcms: %d\n", ret
);
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
);
597 ad1938_set_bias_level(codec
, SND_SOC_BIAS_STANDBY
);
603 /* power down chip */
604 static int ad1938_remove(struct platform_device
*pdev
)
606 struct snd_soc_device
*socdev
= platform_get_drvdata(pdev
);
608 snd_soc_free_pcms(socdev
);
609 snd_soc_dapm_free(socdev
);
615 static int ad1938_suspend(struct platform_device
*pdev
,
618 struct snd_soc_device
*socdev
= platform_get_drvdata(pdev
);
619 struct snd_soc_codec
*codec
= socdev
->card
->codec
;
621 ad1938_set_bias_level(codec
, SND_SOC_BIAS_OFF
);
625 static int ad1938_resume(struct platform_device
*pdev
)
627 struct snd_soc_device
*socdev
= platform_get_drvdata(pdev
);
628 struct snd_soc_codec
*codec
= socdev
->card
->codec
;
630 if (codec
->suspend_bias_level
== SND_SOC_BIAS_ON
)
631 ad1938_set_bias_level(codec
, SND_SOC_BIAS_ON
);
636 #define ad1938_suspend NULL
637 #define ad1938_resume NULL
640 struct snd_soc_codec_device soc_codec_dev_ad1938
= {
641 .probe
= ad1938_probe
,
642 .remove
= ad1938_remove
,
643 .suspend
= ad1938_suspend
,
644 .resume
= ad1938_resume
,
646 EXPORT_SYMBOL_GPL(soc_codec_dev_ad1938
);
648 static int __init
ad1938_init(void)
652 ret
= spi_register_driver(&ad1938_spi_driver
);
654 printk(KERN_ERR
"Failed to register ad1938 SPI driver: %d\n",
660 module_init(ad1938_init
);
662 static void __exit
ad1938_exit(void)
664 spi_unregister_driver(&ad1938_spi_driver
);
666 module_exit(ad1938_exit
);
668 MODULE_DESCRIPTION("ASoC ad1938 driver");
669 MODULE_AUTHOR("Barry Song ");
670 MODULE_LICENSE("GPL");