wm8994-core.c revision 462835e4a7f898662cc30064a33177af4823ef9d 
1/*
2 * wm8994-core.c  --  Device access for Wolfson WM8994
3 *
4 * Copyright 2009 Wolfson Microelectronics PLC.
5 *
6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
7 *
8 *  This program is free software; you can redistribute  it and/or modify it
9 *  under  the terms of  the GNU General  Public License as published by the
10 *  Free Software Foundation;  either version 2 of the  License, or (at your
11 *  option) any later version.
12 *
13 */
14
15#include <linux/kernel.h>
16#include <linux/module.h>
17#include <linux/slab.h>
18#include <linux/i2c.h>
19#include <linux/err.h>
20#include <linux/delay.h>
21#include <linux/mfd/core.h>
22#include <linux/pm_runtime.h>
23#include <linux/regmap.h>
24#include <linux/regulator/consumer.h>
25#include <linux/regulator/machine.h>
26
27#include <linux/mfd/wm8994/core.h>
28#include <linux/mfd/wm8994/pdata.h>
29#include <linux/mfd/wm8994/registers.h>
30
31#include "wm8994.h"
32
33/**
34 * wm8994_reg_read: Read a single WM8994 register.
35 *
36 * @wm8994: Device to read from.
37 * @reg: Register to read.
38 */
39int wm8994_reg_read(struct wm8994 *wm8994, unsigned short reg)
40{
41	unsigned int val;
42	int ret;
43
44	ret = regmap_read(wm8994->regmap, reg, &val);
45
46	if (ret < 0)
47		return ret;
48	else
49		return val;
50}
51EXPORT_SYMBOL_GPL(wm8994_reg_read);
52
53/**
54 * wm8994_bulk_read: Read multiple WM8994 registers
55 *
56 * @wm8994: Device to read from
57 * @reg: First register
58 * @count: Number of registers
59 * @buf: Buffer to fill.  The data will be returned big endian.
60 */
61int wm8994_bulk_read(struct wm8994 *wm8994, unsigned short reg,
62		     int count, u16 *buf)
63{
64	return regmap_bulk_read(wm8994->regmap, reg, buf, count);
65}
66
67/**
68 * wm8994_reg_write: Write a single WM8994 register.
69 *
70 * @wm8994: Device to write to.
71 * @reg: Register to write to.
72 * @val: Value to write.
73 */
74int wm8994_reg_write(struct wm8994 *wm8994, unsigned short reg,
75		     unsigned short val)
76{
77	return regmap_write(wm8994->regmap, reg, val);
78}
79EXPORT_SYMBOL_GPL(wm8994_reg_write);
80
81/**
82 * wm8994_bulk_write: Write multiple WM8994 registers
83 *
84 * @wm8994: Device to write to
85 * @reg: First register
86 * @count: Number of registers
87 * @buf: Buffer to write from.  Data must be big-endian formatted.
88 */
89int wm8994_bulk_write(struct wm8994 *wm8994, unsigned short reg,
90		      int count, const u16 *buf)
91{
92	return regmap_raw_write(wm8994->regmap, reg, buf, count * sizeof(u16));
93}
94EXPORT_SYMBOL_GPL(wm8994_bulk_write);
95
96/**
97 * wm8994_set_bits: Set the value of a bitfield in a WM8994 register
98 *
99 * @wm8994: Device to write to.
100 * @reg: Register to write to.
101 * @mask: Mask of bits to set.
102 * @val: Value to set (unshifted)
103 */
104int wm8994_set_bits(struct wm8994 *wm8994, unsigned short reg,
105		    unsigned short mask, unsigned short val)
106{
107	return regmap_update_bits(wm8994->regmap, reg, mask, val);
108}
109EXPORT_SYMBOL_GPL(wm8994_set_bits);
110
111static struct mfd_cell wm8994_regulator_devs[] = {
112	{
113		.name = "wm8994-ldo",
114		.id = 1,
115		.pm_runtime_no_callbacks = true,
116	},
117	{
118		.name = "wm8994-ldo",
119		.id = 2,
120		.pm_runtime_no_callbacks = true,
121	},
122};
123
124static struct resource wm8994_codec_resources[] = {
125	{
126		.start = WM8994_IRQ_TEMP_SHUT,
127		.end   = WM8994_IRQ_TEMP_WARN,
128		.flags = IORESOURCE_IRQ,
129	},
130};
131
132static struct resource wm8994_gpio_resources[] = {
133	{
134		.start = WM8994_IRQ_GPIO(1),
135		.end   = WM8994_IRQ_GPIO(11),
136		.flags = IORESOURCE_IRQ,
137	},
138};
139
140static struct mfd_cell wm8994_devs[] = {
141	{
142		.name = "wm8994-codec",
143		.num_resources = ARRAY_SIZE(wm8994_codec_resources),
144		.resources = wm8994_codec_resources,
145	},
146
147	{
148		.name = "wm8994-gpio",
149		.num_resources = ARRAY_SIZE(wm8994_gpio_resources),
150		.resources = wm8994_gpio_resources,
151		.pm_runtime_no_callbacks = true,
152	},
153};
154
155/*
156 * Supplies for the main bulk of CODEC; the LDO supplies are ignored
157 * and should be handled via the standard regulator API supply
158 * management.
159 */
160static const char *wm1811_main_supplies[] = {
161	"DBVDD1",
162	"DBVDD2",
163	"DBVDD3",
164	"DCVDD",
165	"AVDD1",
166	"AVDD2",
167	"CPVDD",
168	"SPKVDD1",
169	"SPKVDD2",
170};
171
172static const char *wm8994_main_supplies[] = {
173	"DBVDD",
174	"DCVDD",
175	"AVDD1",
176	"AVDD2",
177	"CPVDD",
178	"SPKVDD1",
179	"SPKVDD2",
180};
181
182static const char *wm8958_main_supplies[] = {
183	"DBVDD1",
184	"DBVDD2",
185	"DBVDD3",
186	"DCVDD",
187	"AVDD1",
188	"AVDD2",
189	"CPVDD",
190	"SPKVDD1",
191	"SPKVDD2",
192};
193
194#ifdef CONFIG_PM
195static int wm8994_suspend(struct device *dev)
196{
197	struct wm8994 *wm8994 = dev_get_drvdata(dev);
198	int ret;
199
200	/* Don't actually go through with the suspend if the CODEC is
201	 * still active (eg, for audio passthrough from CP. */
202	ret = wm8994_reg_read(wm8994, WM8994_POWER_MANAGEMENT_1);
203	if (ret < 0) {
204		dev_err(dev, "Failed to read power status: %d\n", ret);
205	} else if (ret & WM8994_VMID_SEL_MASK) {
206		dev_dbg(dev, "CODEC still active, ignoring suspend\n");
207		return 0;
208	}
209
210	ret = wm8994_reg_read(wm8994, WM8994_POWER_MANAGEMENT_4);
211	if (ret < 0) {
212		dev_err(dev, "Failed to read power status: %d\n", ret);
213	} else if (ret & (WM8994_AIF2ADCL_ENA | WM8994_AIF2ADCR_ENA |
214			  WM8994_AIF1ADC2L_ENA | WM8994_AIF1ADC2R_ENA |
215			  WM8994_AIF1ADC1L_ENA | WM8994_AIF1ADC1R_ENA)) {
216		dev_dbg(dev, "CODEC still active, ignoring suspend\n");
217		return 0;
218	}
219
220	ret = wm8994_reg_read(wm8994, WM8994_POWER_MANAGEMENT_5);
221	if (ret < 0) {
222		dev_err(dev, "Failed to read power status: %d\n", ret);
223	} else if (ret & (WM8994_AIF2DACL_ENA | WM8994_AIF2DACR_ENA |
224			  WM8994_AIF1DAC2L_ENA | WM8994_AIF1DAC2R_ENA |
225			  WM8994_AIF1DAC1L_ENA | WM8994_AIF1DAC1R_ENA)) {
226		dev_dbg(dev, "CODEC still active, ignoring suspend\n");
227		return 0;
228	}
229
230	switch (wm8994->type) {
231	case WM8958:
232	case WM1811:
233		ret = wm8994_reg_read(wm8994, WM8958_MIC_DETECT_1);
234		if (ret < 0) {
235			dev_err(dev, "Failed to read power status: %d\n", ret);
236		} else if (ret & WM8958_MICD_ENA) {
237			dev_dbg(dev, "CODEC still active, ignoring suspend\n");
238			return 0;
239		}
240		break;
241	default:
242		break;
243	}
244
245	switch (wm8994->type) {
246	case WM1811:
247		ret = wm8994_reg_read(wm8994, WM8994_ANTIPOP_2);
248		if (ret < 0) {
249			dev_err(dev, "Failed to read jackdet: %d\n", ret);
250		} else if (ret & WM1811_JACKDET_MODE_MASK) {
251			dev_dbg(dev, "CODEC still active, ignoring suspend\n");
252			return 0;
253		}
254		break;
255	default:
256		break;
257	}
258
259	/* Disable LDO pulldowns while the device is suspended if we
260	 * don't know that something will be driving them. */
261	if (!wm8994->ldo_ena_always_driven)
262		wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
263				WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD,
264				WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD);
265
266	/* Explicitly put the device into reset in case regulators
267	 * don't get disabled in order to ensure consistent restart.
268	 */
269	wm8994_reg_write(wm8994, WM8994_SOFTWARE_RESET,
270			 wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET));
271
272	regcache_cache_only(wm8994->regmap, true);
273	regcache_mark_dirty(wm8994->regmap);
274
275	wm8994->suspended = true;
276
277	ret = regulator_bulk_disable(wm8994->num_supplies,
278				     wm8994->supplies);
279	if (ret != 0) {
280		dev_err(dev, "Failed to disable supplies: %d\n", ret);
281		return ret;
282	}
283
284	return 0;
285}
286
287static int wm8994_resume(struct device *dev)
288{
289	struct wm8994 *wm8994 = dev_get_drvdata(dev);
290	int ret;
291
292	/* We may have lied to the PM core about suspending */
293	if (!wm8994->suspended)
294		return 0;
295
296	ret = regulator_bulk_enable(wm8994->num_supplies,
297				    wm8994->supplies);
298	if (ret != 0) {
299		dev_err(dev, "Failed to enable supplies: %d\n", ret);
300		return ret;
301	}
302
303	regcache_cache_only(wm8994->regmap, false);
304	ret = regcache_sync(wm8994->regmap);
305	if (ret != 0) {
306		dev_err(dev, "Failed to restore register map: %d\n", ret);
307		goto err_enable;
308	}
309
310	/* Disable LDO pulldowns while the device is active */
311	wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
312			WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD,
313			0);
314
315	wm8994->suspended = false;
316
317	return 0;
318
319err_enable:
320	regulator_bulk_disable(wm8994->num_supplies, wm8994->supplies);
321
322	return ret;
323}
324#endif
325
326#ifdef CONFIG_REGULATOR
327static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo)
328{
329	struct wm8994_ldo_pdata *ldo_pdata;
330
331	if (!pdata)
332		return 0;
333
334	ldo_pdata = &pdata->ldo[ldo];
335
336	if (!ldo_pdata->init_data)
337		return 0;
338
339	return ldo_pdata->init_data->num_consumer_supplies != 0;
340}
341#else
342static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo)
343{
344	return 0;
345}
346#endif
347
348static const __devinitdata struct reg_default wm8994_revc_patch[] = {
349	{ 0x102, 0x3 },
350	{ 0x56, 0x3 },
351	{ 0x817, 0x0 },
352	{ 0x102, 0x0 },
353};
354
355static const __devinitdata struct reg_default wm8958_reva_patch[] = {
356	{ 0x102, 0x3 },
357	{ 0xcb, 0x81 },
358	{ 0x817, 0x0 },
359	{ 0x102, 0x0 },
360};
361
362static const __devinitdata struct reg_default wm1811_reva_patch[] = {
363	{ 0x102, 0x3 },
364	{ 0x5d, 0x7e },
365	{ 0x5e, 0x0 },
366	{ 0x102, 0x0 },
367};
368
369/*
370 * Instantiate the generic non-control parts of the device.
371 */
372static __devinit int wm8994_device_init(struct wm8994 *wm8994, int irq)
373{
374	struct wm8994_pdata *pdata = wm8994->dev->platform_data;
375	struct regmap_config *regmap_config;
376	const struct reg_default *regmap_patch = NULL;
377	const char *devname;
378	int ret, i, patch_regs;
379	int pulls = 0;
380
381	dev_set_drvdata(wm8994->dev, wm8994);
382
383	/* Add the on-chip regulators first for bootstrapping */
384	ret = mfd_add_devices(wm8994->dev, -1,
385			      wm8994_regulator_devs,
386			      ARRAY_SIZE(wm8994_regulator_devs),
387			      NULL, 0);
388	if (ret != 0) {
389		dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
390		goto err_regmap;
391	}
392
393	switch (wm8994->type) {
394	case WM1811:
395		wm8994->num_supplies = ARRAY_SIZE(wm1811_main_supplies);
396		break;
397	case WM8994:
398		wm8994->num_supplies = ARRAY_SIZE(wm8994_main_supplies);
399		break;
400	case WM8958:
401		wm8994->num_supplies = ARRAY_SIZE(wm8958_main_supplies);
402		break;
403	default:
404		BUG();
405		goto err_regmap;
406	}
407
408	wm8994->supplies = devm_kzalloc(wm8994->dev,
409					sizeof(struct regulator_bulk_data) *
410					wm8994->num_supplies, GFP_KERNEL);
411	if (!wm8994->supplies) {
412		ret = -ENOMEM;
413		goto err_regmap;
414	}
415
416	switch (wm8994->type) {
417	case WM1811:
418		for (i = 0; i < ARRAY_SIZE(wm1811_main_supplies); i++)
419			wm8994->supplies[i].supply = wm1811_main_supplies[i];
420		break;
421	case WM8994:
422		for (i = 0; i < ARRAY_SIZE(wm8994_main_supplies); i++)
423			wm8994->supplies[i].supply = wm8994_main_supplies[i];
424		break;
425	case WM8958:
426		for (i = 0; i < ARRAY_SIZE(wm8958_main_supplies); i++)
427			wm8994->supplies[i].supply = wm8958_main_supplies[i];
428		break;
429	default:
430		BUG();
431		goto err_regmap;
432	}
433
434	ret = regulator_bulk_get(wm8994->dev, wm8994->num_supplies,
435				 wm8994->supplies);
436	if (ret != 0) {
437		dev_err(wm8994->dev, "Failed to get supplies: %d\n", ret);
438		goto err_regmap;
439	}
440
441	ret = regulator_bulk_enable(wm8994->num_supplies,
442				    wm8994->supplies);
443	if (ret != 0) {
444		dev_err(wm8994->dev, "Failed to enable supplies: %d\n", ret);
445		goto err_get;
446	}
447
448	ret = wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET);
449	if (ret < 0) {
450		dev_err(wm8994->dev, "Failed to read ID register\n");
451		goto err_enable;
452	}
453	switch (ret) {
454	case 0x1811:
455		devname = "WM1811";
456		if (wm8994->type != WM1811)
457			dev_warn(wm8994->dev, "Device registered as type %d\n",
458				 wm8994->type);
459		wm8994->type = WM1811;
460		break;
461	case 0x8994:
462		devname = "WM8994";
463		if (wm8994->type != WM8994)
464			dev_warn(wm8994->dev, "Device registered as type %d\n",
465				 wm8994->type);
466		wm8994->type = WM8994;
467		break;
468	case 0x8958:
469		devname = "WM8958";
470		if (wm8994->type != WM8958)
471			dev_warn(wm8994->dev, "Device registered as type %d\n",
472				 wm8994->type);
473		wm8994->type = WM8958;
474		break;
475	default:
476		dev_err(wm8994->dev, "Device is not a WM8994, ID is %x\n",
477			ret);
478		ret = -EINVAL;
479		goto err_enable;
480	}
481
482	ret = wm8994_reg_read(wm8994, WM8994_CHIP_REVISION);
483	if (ret < 0) {
484		dev_err(wm8994->dev, "Failed to read revision register: %d\n",
485			ret);
486		goto err_enable;
487	}
488	wm8994->revision = ret;
489
490	switch (wm8994->type) {
491	case WM8994:
492		switch (wm8994->revision) {
493		case 0:
494		case 1:
495			dev_warn(wm8994->dev,
496				 "revision %c not fully supported\n",
497				 'A' + wm8994->revision);
498			break;
499		case 2:
500		case 3:
501			regmap_patch = wm8994_revc_patch;
502			patch_regs = ARRAY_SIZE(wm8994_revc_patch);
503			break;
504		default:
505			break;
506		}
507		break;
508
509	case WM8958:
510		switch (wm8994->revision) {
511		case 0:
512			regmap_patch = wm8958_reva_patch;
513			patch_regs = ARRAY_SIZE(wm8958_reva_patch);
514			break;
515		default:
516			break;
517		}
518		break;
519
520	case WM1811:
521		/* Revision C did not change the relevant layer */
522		if (wm8994->revision > 1)
523			wm8994->revision++;
524		switch (wm8994->revision) {
525		case 0:
526		case 1:
527			regmap_patch = wm1811_reva_patch;
528			patch_regs = ARRAY_SIZE(wm1811_reva_patch);
529			break;
530		default:
531			break;
532		}
533		break;
534
535	default:
536		break;
537	}
538
539	dev_info(wm8994->dev, "%s revision %c\n", devname,
540		 'A' + wm8994->revision);
541
542	switch (wm8994->type) {
543	case WM1811:
544		regmap_config = &wm1811_regmap_config;
545		break;
546	case WM8994:
547		regmap_config = &wm8994_regmap_config;
548		break;
549	case WM8958:
550		regmap_config = &wm8958_regmap_config;
551		break;
552	default:
553		dev_err(wm8994->dev, "Unknown device type %d\n", wm8994->type);
554		return -EINVAL;
555	}
556
557	ret = regmap_reinit_cache(wm8994->regmap, regmap_config);
558	if (ret != 0) {
559		dev_err(wm8994->dev, "Failed to reinit register cache: %d\n",
560			ret);
561		return ret;
562	}
563
564	if (regmap_patch) {
565		ret = regmap_register_patch(wm8994->regmap, regmap_patch,
566					    patch_regs);
567		if (ret != 0) {
568			dev_err(wm8994->dev, "Failed to register patch: %d\n",
569				ret);
570			goto err_regmap;
571		}
572	}
573
574	if (pdata) {
575		wm8994->irq_base = pdata->irq_base;
576		wm8994->gpio_base = pdata->gpio_base;
577
578		/* GPIO configuration is only applied if it's non-zero */
579		for (i = 0; i < ARRAY_SIZE(pdata->gpio_defaults); i++) {
580			if (pdata->gpio_defaults[i]) {
581				wm8994_set_bits(wm8994, WM8994_GPIO_1 + i,
582						0xffff,
583						pdata->gpio_defaults[i]);
584			}
585		}
586
587		wm8994->ldo_ena_always_driven = pdata->ldo_ena_always_driven;
588
589		if (pdata->spkmode_pu)
590			pulls |= WM8994_SPKMODE_PU;
591	}
592
593	/* Disable unneeded pulls */
594	wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
595			WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD |
596			WM8994_SPKMODE_PU | WM8994_CSNADDR_PD,
597			pulls);
598
599	/* In some system designs where the regulators are not in use,
600	 * we can achieve a small reduction in leakage currents by
601	 * floating LDO outputs.  This bit makes no difference if the
602	 * LDOs are enabled, it only affects cases where the LDOs were
603	 * in operation and are then disabled.
604	 */
605	for (i = 0; i < WM8994_NUM_LDO_REGS; i++) {
606		if (wm8994_ldo_in_use(pdata, i))
607			wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
608					WM8994_LDO1_DISCH, WM8994_LDO1_DISCH);
609		else
610			wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
611					WM8994_LDO1_DISCH, 0);
612	}
613
614	wm8994_irq_init(wm8994);
615
616	ret = mfd_add_devices(wm8994->dev, -1,
617			      wm8994_devs, ARRAY_SIZE(wm8994_devs),
618			      NULL, 0);
619	if (ret != 0) {
620		dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
621		goto err_irq;
622	}
623
624	pm_runtime_enable(wm8994->dev);
625	pm_runtime_resume(wm8994->dev);
626
627	return 0;
628
629err_irq:
630	wm8994_irq_exit(wm8994);
631err_enable:
632	regulator_bulk_disable(wm8994->num_supplies,
633			       wm8994->supplies);
634err_get:
635	regulator_bulk_free(wm8994->num_supplies, wm8994->supplies);
636err_regmap:
637	regmap_exit(wm8994->regmap);
638	mfd_remove_devices(wm8994->dev);
639	return ret;
640}
641
642static __devexit void wm8994_device_exit(struct wm8994 *wm8994)
643{
644	pm_runtime_disable(wm8994->dev);
645	mfd_remove_devices(wm8994->dev);
646	wm8994_irq_exit(wm8994);
647	regulator_bulk_disable(wm8994->num_supplies,
648			       wm8994->supplies);
649	regulator_bulk_free(wm8994->num_supplies, wm8994->supplies);
650	regmap_exit(wm8994->regmap);
651}
652
653static const struct of_device_id wm8994_of_match[] = {
654	{ .compatible = "wlf,wm1811", },
655	{ .compatible = "wlf,wm8994", },
656	{ .compatible = "wlf,wm8958", },
657	{ }
658};
659MODULE_DEVICE_TABLE(of, wm8994_of_match);
660
661static __devinit int wm8994_i2c_probe(struct i2c_client *i2c,
662				      const struct i2c_device_id *id)
663{
664	struct wm8994 *wm8994;
665	int ret;
666
667	wm8994 = devm_kzalloc(&i2c->dev, sizeof(struct wm8994), GFP_KERNEL);
668	if (wm8994 == NULL)
669		return -ENOMEM;
670
671	i2c_set_clientdata(i2c, wm8994);
672	wm8994->dev = &i2c->dev;
673	wm8994->irq = i2c->irq;
674	wm8994->type = id->driver_data;
675
676	wm8994->regmap = regmap_init_i2c(i2c, &wm8994_base_regmap_config);
677	if (IS_ERR(wm8994->regmap)) {
678		ret = PTR_ERR(wm8994->regmap);
679		dev_err(wm8994->dev, "Failed to allocate register map: %d\n",
680			ret);
681		return ret;
682	}
683
684	return wm8994_device_init(wm8994, i2c->irq);
685}
686
687static __devexit int wm8994_i2c_remove(struct i2c_client *i2c)
688{
689	struct wm8994 *wm8994 = i2c_get_clientdata(i2c);
690
691	wm8994_device_exit(wm8994);
692
693	return 0;
694}
695
696static const struct i2c_device_id wm8994_i2c_id[] = {
697	{ "wm1811", WM1811 },
698	{ "wm1811a", WM1811 },
699	{ "wm8994", WM8994 },
700	{ "wm8958", WM8958 },
701	{ }
702};
703MODULE_DEVICE_TABLE(i2c, wm8994_i2c_id);
704
705static UNIVERSAL_DEV_PM_OPS(wm8994_pm_ops, wm8994_suspend, wm8994_resume,
706			    NULL);
707
708static struct i2c_driver wm8994_i2c_driver = {
709	.driver = {
710		.name = "wm8994",
711		.owner = THIS_MODULE,
712		.pm = &wm8994_pm_ops,
713		.of_match_table = wm8994_of_match,
714	},
715	.probe = wm8994_i2c_probe,
716	.remove = __devexit_p(wm8994_i2c_remove),
717	.id_table = wm8994_i2c_id,
718};
719
720static int __init wm8994_i2c_init(void)
721{
722	int ret;
723
724	ret = i2c_add_driver(&wm8994_i2c_driver);
725	if (ret != 0)
726		pr_err("Failed to register wm8994 I2C driver: %d\n", ret);
727
728	return ret;
729}
730module_init(wm8994_i2c_init);
731
732static void __exit wm8994_i2c_exit(void)
733{
734	i2c_del_driver(&wm8994_i2c_driver);
735}
736module_exit(wm8994_i2c_exit);
737
738MODULE_DESCRIPTION("Core support for the WM8994 audio CODEC");
739MODULE_LICENSE("GPL");
740MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
741