ASoC: Add indirection for CODEC private data
[linux-2.6.git] / sound / soc / codecs / wm8523.c
1 /*
2  * wm8523.c  --  WM8523 ALSA SoC Audio driver
3  *
4  * Copyright 2009 Wolfson Microelectronics plc
5  *
6  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
7  *
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License version 2 as
11  * published by the Free Software Foundation.
12  */
13
14 #include <linux/module.h>
15 #include <linux/moduleparam.h>
16 #include <linux/init.h>
17 #include <linux/delay.h>
18 #include <linux/pm.h>
19 #include <linux/i2c.h>
20 #include <linux/platform_device.h>
21 #include <linux/regulator/consumer.h>
22 #include <sound/core.h>
23 #include <sound/pcm.h>
24 #include <sound/pcm_params.h>
25 #include <sound/soc.h>
26 #include <sound/soc-dapm.h>
27 #include <sound/initval.h>
28 #include <sound/tlv.h>
29
30 #include "wm8523.h"
31
32 static struct snd_soc_codec *wm8523_codec;
33 struct snd_soc_codec_device soc_codec_dev_wm8523;
34
35 #define WM8523_NUM_SUPPLIES 2
36 static const char *wm8523_supply_names[WM8523_NUM_SUPPLIES] = {
37         "AVDD",
38         "LINEVDD",
39 };
40
41 #define WM8523_NUM_RATES 7
42
43 /* codec private data */
44 struct wm8523_priv {
45         struct snd_soc_codec codec;
46         u16 reg_cache[WM8523_REGISTER_COUNT];
47         struct regulator_bulk_data supplies[WM8523_NUM_SUPPLIES];
48         unsigned int sysclk;
49         unsigned int rate_constraint_list[WM8523_NUM_RATES];
50         struct snd_pcm_hw_constraint_list rate_constraint;
51 };
52
53 static const u16 wm8523_reg[WM8523_REGISTER_COUNT] = {
54         0x8523,     /* R0 - DEVICE_ID */
55         0x0001,     /* R1 - REVISION */
56         0x0000,     /* R2 - PSCTRL1 */
57         0x1812,     /* R3 - AIF_CTRL1 */
58         0x0000,     /* R4 - AIF_CTRL2 */
59         0x0001,     /* R5 - DAC_CTRL3 */
60         0x0190,     /* R6 - DAC_GAINL */
61         0x0190,     /* R7 - DAC_GAINR */
62         0x0000,     /* R8 - ZERO_DETECT */
63 };
64
65 static int wm8523_volatile_register(unsigned int reg)
66 {
67         switch (reg) {
68         case WM8523_DEVICE_ID:
69         case WM8523_REVISION:
70                 return 1;
71         default:
72                 return 0;
73         }
74 }
75
76 static int wm8523_reset(struct snd_soc_codec *codec)
77 {
78         return snd_soc_write(codec, WM8523_DEVICE_ID, 0);
79 }
80
81 static const DECLARE_TLV_DB_SCALE(dac_tlv, -10000, 25, 0);
82
83 static const char *wm8523_zd_count_text[] = {
84         "1024",
85         "2048",
86 };
87
88 static const struct soc_enum wm8523_zc_count =
89         SOC_ENUM_SINGLE(WM8523_ZERO_DETECT, 0, 2, wm8523_zd_count_text);
90
91 static const struct snd_kcontrol_new wm8523_snd_controls[] = {
92 SOC_DOUBLE_R_TLV("Playback Volume", WM8523_DAC_GAINL, WM8523_DAC_GAINR,
93                  0, 448, 0, dac_tlv),
94 SOC_SINGLE("ZC Switch", WM8523_DAC_CTRL3, 4, 1, 0),
95 SOC_SINGLE("Playback Deemphasis Switch", WM8523_AIF_CTRL1, 8, 1, 0),
96 SOC_DOUBLE("Playback Switch", WM8523_DAC_CTRL3, 2, 3, 1, 1),
97 SOC_SINGLE("Volume Ramp Up Switch", WM8523_DAC_CTRL3, 1, 1, 0),
98 SOC_SINGLE("Volume Ramp Down Switch", WM8523_DAC_CTRL3, 0, 1, 0),
99 SOC_ENUM("Zero Detect Count", wm8523_zc_count),
100 };
101
102 static const struct snd_soc_dapm_widget wm8523_dapm_widgets[] = {
103 SND_SOC_DAPM_DAC("DAC", "Playback", SND_SOC_NOPM, 0, 0),
104 SND_SOC_DAPM_OUTPUT("LINEVOUTL"),
105 SND_SOC_DAPM_OUTPUT("LINEVOUTR"),
106 };
107
108 static const struct snd_soc_dapm_route intercon[] = {
109         { "LINEVOUTL", NULL, "DAC" },
110         { "LINEVOUTR", NULL, "DAC" },
111 };
112
113 static int wm8523_add_widgets(struct snd_soc_codec *codec)
114 {
115         snd_soc_dapm_new_controls(codec, wm8523_dapm_widgets,
116                                   ARRAY_SIZE(wm8523_dapm_widgets));
117
118         snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon));
119
120         return 0;
121 }
122
123 static struct {
124         int value;
125         int ratio;
126 } lrclk_ratios[WM8523_NUM_RATES] = {
127         { 1, 128 },
128         { 2, 192 },
129         { 3, 256 },
130         { 4, 384 },
131         { 5, 512 },
132         { 6, 768 },
133         { 7, 1152 },
134 };
135
136 static int wm8523_startup(struct snd_pcm_substream *substream,
137                           struct snd_soc_dai *dai)
138 {
139         struct snd_soc_codec *codec = dai->codec;
140         struct wm8523_priv *wm8523 = snd_soc_codec_get_drvdata(codec);
141
142         /* The set of sample rates that can be supported depends on the
143          * MCLK supplied to the CODEC - enforce this.
144          */
145         if (!wm8523->sysclk) {
146                 dev_err(codec->dev,
147                         "No MCLK configured, call set_sysclk() on init\n");
148                 return -EINVAL;
149         }
150
151         return 0;
152         snd_pcm_hw_constraint_list(substream->runtime, 0,
153                                    SNDRV_PCM_HW_PARAM_RATE,
154                                    &wm8523->rate_constraint);
155
156         return 0;
157 }
158
159 static int wm8523_hw_params(struct snd_pcm_substream *substream,
160                             struct snd_pcm_hw_params *params,
161                             struct snd_soc_dai *dai)
162 {
163         struct snd_soc_pcm_runtime *rtd = substream->private_data;
164         struct snd_soc_device *socdev = rtd->socdev;
165         struct snd_soc_codec *codec = socdev->card->codec;
166         struct wm8523_priv *wm8523 = snd_soc_codec_get_drvdata(codec);
167         int i;
168         u16 aifctrl1 = snd_soc_read(codec, WM8523_AIF_CTRL1);
169         u16 aifctrl2 = snd_soc_read(codec, WM8523_AIF_CTRL2);
170
171         /* Find a supported LRCLK ratio */
172         for (i = 0; i < ARRAY_SIZE(lrclk_ratios); i++) {
173                 if (wm8523->sysclk / params_rate(params) ==
174                     lrclk_ratios[i].ratio)
175                         break;
176         }
177
178         /* Should never happen, should be handled by constraints */
179         if (i == ARRAY_SIZE(lrclk_ratios)) {
180                 dev_err(codec->dev, "MCLK/fs ratio %d unsupported\n",
181                         wm8523->sysclk / params_rate(params));
182                 return -EINVAL;
183         }
184
185         aifctrl2 &= ~WM8523_SR_MASK;
186         aifctrl2 |= lrclk_ratios[i].value;
187
188         aifctrl1 &= ~WM8523_WL_MASK;
189         switch (params_format(params)) {
190         case SNDRV_PCM_FORMAT_S16_LE:
191                 break;
192         case SNDRV_PCM_FORMAT_S20_3LE:
193                 aifctrl1 |= 0x8;
194                 break;
195         case SNDRV_PCM_FORMAT_S24_LE:
196                 aifctrl1 |= 0x10;
197                 break;
198         case SNDRV_PCM_FORMAT_S32_LE:
199                 aifctrl1 |= 0x18;
200                 break;
201         }
202
203         snd_soc_write(codec, WM8523_AIF_CTRL1, aifctrl1);
204         snd_soc_write(codec, WM8523_AIF_CTRL2, aifctrl2);
205
206         return 0;
207 }
208
209 static int wm8523_set_dai_sysclk(struct snd_soc_dai *codec_dai,
210                 int clk_id, unsigned int freq, int dir)
211 {
212         struct snd_soc_codec *codec = codec_dai->codec;
213         struct wm8523_priv *wm8523 = snd_soc_codec_get_drvdata(codec);
214         unsigned int val;
215         int i;
216
217         wm8523->sysclk = freq;
218
219         wm8523->rate_constraint.count = 0;
220         for (i = 0; i < ARRAY_SIZE(lrclk_ratios); i++) {
221                 val = freq / lrclk_ratios[i].ratio;
222                 /* Check that it's a standard rate since core can't
223                  * cope with others and having the odd rates confuses
224                  * constraint matching.
225                  */
226                 switch (val) {
227                 case 8000:
228                 case 11025:
229                 case 16000:
230                 case 22050:
231                 case 32000:
232                 case 44100:
233                 case 48000:
234                 case 64000:
235                 case 88200:
236                 case 96000:
237                 case 176400:
238                 case 192000:
239                         dev_dbg(codec->dev, "Supported sample rate: %dHz\n",
240                                 val);
241                         wm8523->rate_constraint_list[i] = val;
242                         wm8523->rate_constraint.count++;
243                         break;
244                 default:
245                         dev_dbg(codec->dev, "Skipping sample rate: %dHz\n",
246                                 val);
247                 }
248         }
249
250         /* Need at least one supported rate... */
251         if (wm8523->rate_constraint.count == 0)
252                 return -EINVAL;
253
254         return 0;
255 }
256
257
258 static int wm8523_set_dai_fmt(struct snd_soc_dai *codec_dai,
259                 unsigned int fmt)
260 {
261         struct snd_soc_codec *codec = codec_dai->codec;
262         u16 aifctrl1 = snd_soc_read(codec, WM8523_AIF_CTRL1);
263
264         aifctrl1 &= ~(WM8523_BCLK_INV_MASK | WM8523_LRCLK_INV_MASK |
265                       WM8523_FMT_MASK | WM8523_AIF_MSTR_MASK);
266
267         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
268         case SND_SOC_DAIFMT_CBM_CFM:
269                 aifctrl1 |= WM8523_AIF_MSTR;
270                 break;
271         case SND_SOC_DAIFMT_CBS_CFS:
272                 break;
273         default:
274                 return -EINVAL;
275         }
276
277         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
278         case SND_SOC_DAIFMT_I2S:
279                 aifctrl1 |= 0x0002;
280                 break;
281         case SND_SOC_DAIFMT_RIGHT_J:
282                 break;
283         case SND_SOC_DAIFMT_LEFT_J:
284                 aifctrl1 |= 0x0001;
285                 break;
286         case SND_SOC_DAIFMT_DSP_A:
287                 aifctrl1 |= 0x0003;
288                 break;
289         case SND_SOC_DAIFMT_DSP_B:
290                 aifctrl1 |= 0x0023;
291                 break;
292         default:
293                 return -EINVAL;
294         }
295
296         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
297         case SND_SOC_DAIFMT_NB_NF:
298                 break;
299         case SND_SOC_DAIFMT_IB_IF:
300                 aifctrl1 |= WM8523_BCLK_INV | WM8523_LRCLK_INV;
301                 break;
302         case SND_SOC_DAIFMT_IB_NF:
303                 aifctrl1 |= WM8523_BCLK_INV;
304                 break;
305         case SND_SOC_DAIFMT_NB_IF:
306                 aifctrl1 |= WM8523_LRCLK_INV;
307                 break;
308         default:
309                 return -EINVAL;
310         }
311
312         snd_soc_write(codec, WM8523_AIF_CTRL1, aifctrl1);
313
314         return 0;
315 }
316
317 static int wm8523_set_bias_level(struct snd_soc_codec *codec,
318                                  enum snd_soc_bias_level level)
319 {
320         struct wm8523_priv *wm8523 = snd_soc_codec_get_drvdata(codec);
321         int ret, i;
322
323         switch (level) {
324         case SND_SOC_BIAS_ON:
325                 break;
326
327         case SND_SOC_BIAS_PREPARE:
328                 /* Full power on */
329                 snd_soc_update_bits(codec, WM8523_PSCTRL1,
330                                     WM8523_SYS_ENA_MASK, 3);
331                 break;
332
333         case SND_SOC_BIAS_STANDBY:
334                 if (codec->bias_level == SND_SOC_BIAS_OFF) {
335                         ret = regulator_bulk_enable(ARRAY_SIZE(wm8523->supplies),
336                                                     wm8523->supplies);
337                         if (ret != 0) {
338                                 dev_err(codec->dev,
339                                         "Failed to enable supplies: %d\n",
340                                         ret);
341                                 return ret;
342                         }
343
344                         /* Initial power up */
345                         snd_soc_update_bits(codec, WM8523_PSCTRL1,
346                                             WM8523_SYS_ENA_MASK, 1);
347
348                         /* Sync back default/cached values */
349                         for (i = WM8523_AIF_CTRL1;
350                              i < WM8523_MAX_REGISTER; i++)
351                                 snd_soc_write(codec, i, wm8523->reg_cache[i]);
352
353
354                         msleep(100);
355                 }
356
357                 /* Power up to mute */
358                 snd_soc_update_bits(codec, WM8523_PSCTRL1,
359                                     WM8523_SYS_ENA_MASK, 2);
360
361                 break;
362
363         case SND_SOC_BIAS_OFF:
364                 /* The chip runs through the power down sequence for us. */
365                 snd_soc_update_bits(codec, WM8523_PSCTRL1,
366                                     WM8523_SYS_ENA_MASK, 0);
367                 msleep(100);
368
369                 regulator_bulk_disable(ARRAY_SIZE(wm8523->supplies),
370                                        wm8523->supplies);
371                 break;
372         }
373         codec->bias_level = level;
374         return 0;
375 }
376
377 #define WM8523_RATES SNDRV_PCM_RATE_8000_192000
378
379 #define WM8523_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
380                         SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE)
381
382 static struct snd_soc_dai_ops wm8523_dai_ops = {
383         .startup        = wm8523_startup,
384         .hw_params      = wm8523_hw_params,
385         .set_sysclk     = wm8523_set_dai_sysclk,
386         .set_fmt        = wm8523_set_dai_fmt,
387 };
388
389 struct snd_soc_dai wm8523_dai = {
390         .name = "WM8523",
391         .playback = {
392                 .stream_name = "Playback",
393                 .channels_min = 2,  /* Mono modes not yet supported */
394                 .channels_max = 2,
395                 .rates = WM8523_RATES,
396                 .formats = WM8523_FORMATS,
397         },
398         .ops = &wm8523_dai_ops,
399 };
400 EXPORT_SYMBOL_GPL(wm8523_dai);
401
402 #ifdef CONFIG_PM
403 static int wm8523_suspend(struct platform_device *pdev, pm_message_t state)
404 {
405         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
406         struct snd_soc_codec *codec = socdev->card->codec;
407
408         wm8523_set_bias_level(codec, SND_SOC_BIAS_OFF);
409         return 0;
410 }
411
412 static int wm8523_resume(struct platform_device *pdev)
413 {
414         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
415         struct snd_soc_codec *codec = socdev->card->codec;
416
417         wm8523_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
418
419         return 0;
420 }
421 #else
422 #define wm8523_suspend NULL
423 #define wm8523_resume NULL
424 #endif
425
426 static int wm8523_probe(struct platform_device *pdev)
427 {
428         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
429         struct snd_soc_codec *codec;
430         int ret = 0;
431
432         if (wm8523_codec == NULL) {
433                 dev_err(&pdev->dev, "Codec device not registered\n");
434                 return -ENODEV;
435         }
436
437         socdev->card->codec = wm8523_codec;
438         codec = wm8523_codec;
439
440         /* register pcms */
441         ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
442         if (ret < 0) {
443                 dev_err(codec->dev, "failed to create pcms: %d\n", ret);
444                 goto pcm_err;
445         }
446
447         snd_soc_add_controls(codec, wm8523_snd_controls,
448                              ARRAY_SIZE(wm8523_snd_controls));
449         wm8523_add_widgets(codec);
450
451         return ret;
452
453 pcm_err:
454         return ret;
455 }
456
457 static int wm8523_remove(struct platform_device *pdev)
458 {
459         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
460
461         snd_soc_free_pcms(socdev);
462         snd_soc_dapm_free(socdev);
463
464         return 0;
465 }
466
467 struct snd_soc_codec_device soc_codec_dev_wm8523 = {
468         .probe =        wm8523_probe,
469         .remove =       wm8523_remove,
470         .suspend =      wm8523_suspend,
471         .resume =       wm8523_resume,
472 };
473 EXPORT_SYMBOL_GPL(soc_codec_dev_wm8523);
474
475 static int wm8523_register(struct wm8523_priv *wm8523,
476                            enum snd_soc_control_type control)
477 {
478         int ret;
479         struct snd_soc_codec *codec = &wm8523->codec;
480         int i;
481
482         if (wm8523_codec) {
483                 dev_err(codec->dev, "Another WM8523 is registered\n");
484                 return -EINVAL;
485         }
486
487         mutex_init(&codec->mutex);
488         INIT_LIST_HEAD(&codec->dapm_widgets);
489         INIT_LIST_HEAD(&codec->dapm_paths);
490
491         snd_soc_codec_set_drvdata(codec, wm8523);
492         codec->name = "WM8523";
493         codec->owner = THIS_MODULE;
494         codec->bias_level = SND_SOC_BIAS_OFF;
495         codec->set_bias_level = wm8523_set_bias_level;
496         codec->dai = &wm8523_dai;
497         codec->num_dai = 1;
498         codec->reg_cache_size = WM8523_REGISTER_COUNT;
499         codec->reg_cache = &wm8523->reg_cache;
500         codec->volatile_register = wm8523_volatile_register;
501
502         wm8523->rate_constraint.list = &wm8523->rate_constraint_list[0];
503         wm8523->rate_constraint.count =
504                 ARRAY_SIZE(wm8523->rate_constraint_list);
505
506         memcpy(codec->reg_cache, wm8523_reg, sizeof(wm8523_reg));
507
508         ret = snd_soc_codec_set_cache_io(codec, 8, 16, control);
509         if (ret != 0) {
510                 dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
511                 goto err;
512         }
513
514         for (i = 0; i < ARRAY_SIZE(wm8523->supplies); i++)
515                 wm8523->supplies[i].supply = wm8523_supply_names[i];
516
517         ret = regulator_bulk_get(codec->dev, ARRAY_SIZE(wm8523->supplies),
518                                  wm8523->supplies);
519         if (ret != 0) {
520                 dev_err(codec->dev, "Failed to request supplies: %d\n", ret);
521                 goto err;
522         }
523
524         ret = regulator_bulk_enable(ARRAY_SIZE(wm8523->supplies),
525                                     wm8523->supplies);
526         if (ret != 0) {
527                 dev_err(codec->dev, "Failed to enable supplies: %d\n", ret);
528                 goto err_get;
529         }
530
531         ret = snd_soc_read(codec, WM8523_DEVICE_ID);
532         if (ret < 0) {
533                 dev_err(codec->dev, "Failed to read ID register\n");
534                 goto err_enable;
535         }
536         if (ret != wm8523_reg[WM8523_DEVICE_ID]) {
537                 dev_err(codec->dev, "Device is not a WM8523, ID is %x\n", ret);
538                 ret = -EINVAL;
539                 goto err_enable;
540         }
541
542         ret = snd_soc_read(codec, WM8523_REVISION);
543         if (ret < 0) {
544                 dev_err(codec->dev, "Failed to read revision register\n");
545                 goto err_enable;
546         }
547         dev_info(codec->dev, "revision %c\n",
548                  (ret & WM8523_CHIP_REV_MASK) + 'A');
549
550         ret = wm8523_reset(codec);
551         if (ret < 0) {
552                 dev_err(codec->dev, "Failed to issue reset\n");
553                 goto err_enable;
554         }
555
556         wm8523_dai.dev = codec->dev;
557
558         /* Change some default settings - latch VU and enable ZC */
559         wm8523->reg_cache[WM8523_DAC_GAINR] |= WM8523_DACR_VU;
560         wm8523->reg_cache[WM8523_DAC_CTRL3] |= WM8523_ZC;
561
562         wm8523_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
563
564         /* Bias level configuration will have done an extra enable */
565         regulator_bulk_disable(ARRAY_SIZE(wm8523->supplies), wm8523->supplies);
566
567         wm8523_codec = codec;
568
569         ret = snd_soc_register_codec(codec);
570         if (ret != 0) {
571                 dev_err(codec->dev, "Failed to register codec: %d\n", ret);
572                 return ret;
573         }
574
575         ret = snd_soc_register_dai(&wm8523_dai);
576         if (ret != 0) {
577                 dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
578                 snd_soc_unregister_codec(codec);
579                 return ret;
580         }
581
582         return 0;
583
584 err_enable:
585         regulator_bulk_disable(ARRAY_SIZE(wm8523->supplies), wm8523->supplies);
586 err_get:
587         regulator_bulk_free(ARRAY_SIZE(wm8523->supplies), wm8523->supplies);
588 err:
589         kfree(wm8523);
590         return ret;
591 }
592
593 static void wm8523_unregister(struct wm8523_priv *wm8523)
594 {
595         wm8523_set_bias_level(&wm8523->codec, SND_SOC_BIAS_OFF);
596         regulator_bulk_free(ARRAY_SIZE(wm8523->supplies), wm8523->supplies);
597         snd_soc_unregister_dai(&wm8523_dai);
598         snd_soc_unregister_codec(&wm8523->codec);
599         kfree(wm8523);
600         wm8523_codec = NULL;
601 }
602
603 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
604 static __devinit int wm8523_i2c_probe(struct i2c_client *i2c,
605                                       const struct i2c_device_id *id)
606 {
607         struct wm8523_priv *wm8523;
608         struct snd_soc_codec *codec;
609
610         wm8523 = kzalloc(sizeof(struct wm8523_priv), GFP_KERNEL);
611         if (wm8523 == NULL)
612                 return -ENOMEM;
613
614         codec = &wm8523->codec;
615         codec->hw_write = (hw_write_t)i2c_master_send;
616
617         i2c_set_clientdata(i2c, wm8523);
618         codec->control_data = i2c;
619
620         codec->dev = &i2c->dev;
621
622         return wm8523_register(wm8523, SND_SOC_I2C);
623 }
624
625 static __devexit int wm8523_i2c_remove(struct i2c_client *client)
626 {
627         struct wm8523_priv *wm8523 = i2c_get_clientdata(client);
628         wm8523_unregister(wm8523);
629         return 0;
630 }
631
632 static const struct i2c_device_id wm8523_i2c_id[] = {
633         { "wm8523", 0 },
634         { }
635 };
636 MODULE_DEVICE_TABLE(i2c, wm8523_i2c_id);
637
638 static struct i2c_driver wm8523_i2c_driver = {
639         .driver = {
640                 .name = "WM8523",
641                 .owner = THIS_MODULE,
642         },
643         .probe =    wm8523_i2c_probe,
644         .remove =   __devexit_p(wm8523_i2c_remove),
645         .id_table = wm8523_i2c_id,
646 };
647 #endif
648
649 static int __init wm8523_modinit(void)
650 {
651         int ret;
652 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
653         ret = i2c_add_driver(&wm8523_i2c_driver);
654         if (ret != 0) {
655                 printk(KERN_ERR "Failed to register WM8523 I2C driver: %d\n",
656                        ret);
657         }
658 #endif
659         return 0;
660 }
661 module_init(wm8523_modinit);
662
663 static void __exit wm8523_exit(void)
664 {
665 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
666         i2c_del_driver(&wm8523_i2c_driver);
667 #endif
668 }
669 module_exit(wm8523_exit);
670
671 MODULE_DESCRIPTION("ASoC WM8523 driver");
672 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
673 MODULE_LICENSE("GPL");