wm8994-core.c revision a0cc0209abb9fe2b9ab71aa41be70eddd0cbdd61 
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	{ 0x56, 0x7 },
365	{ 0x5d, 0x7e },
366	{ 0x5e, 0x0 },
367	{ 0x102, 0x0 },
368};
369
370/*
371 * Instantiate the generic non-control parts of the device.
372 */
373static __devinit int wm8994_device_init(struct wm8994 *wm8994, int irq)
374{
375	struct wm8994_pdata *pdata = wm8994->dev->platform_data;
376	struct regmap_config *regmap_config;
377	const struct reg_default *regmap_patch = NULL;
378	const char *devname;
379	int ret, i, patch_regs;
380	int pulls = 0;
381
382	dev_set_drvdata(wm8994->dev, wm8994);
383
384	/* Add the on-chip regulators first for bootstrapping */
385	ret = mfd_add_devices(wm8994->dev, -1,
386			      wm8994_regulator_devs,
387			      ARRAY_SIZE(wm8994_regulator_devs),
388			      NULL, 0);
389	if (ret != 0) {
390		dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
391		goto err;
392	}
393
394	switch (wm8994->type) {
395	case WM1811:
396		wm8994->num_supplies = ARRAY_SIZE(wm1811_main_supplies);
397		break;
398	case WM8994:
399		wm8994->num_supplies = ARRAY_SIZE(wm8994_main_supplies);
400		break;
401	case WM8958:
402		wm8994->num_supplies = ARRAY_SIZE(wm8958_main_supplies);
403		break;
404	default:
405		BUG();
406		goto err;
407	}
408
409	wm8994->supplies = devm_kzalloc(wm8994->dev,
410					sizeof(struct regulator_bulk_data) *
411					wm8994->num_supplies, GFP_KERNEL);
412	if (!wm8994->supplies) {
413		ret = -ENOMEM;
414		goto err;
415	}
416
417	switch (wm8994->type) {
418	case WM1811:
419		for (i = 0; i < ARRAY_SIZE(wm1811_main_supplies); i++)
420			wm8994->supplies[i].supply = wm1811_main_supplies[i];
421		break;
422	case WM8994:
423		for (i = 0; i < ARRAY_SIZE(wm8994_main_supplies); i++)
424			wm8994->supplies[i].supply = wm8994_main_supplies[i];
425		break;
426	case WM8958:
427		for (i = 0; i < ARRAY_SIZE(wm8958_main_supplies); i++)
428			wm8994->supplies[i].supply = wm8958_main_supplies[i];
429		break;
430	default:
431		BUG();
432		goto err;
433	}
434
435	ret = regulator_bulk_get(wm8994->dev, wm8994->num_supplies,
436				 wm8994->supplies);
437	if (ret != 0) {
438		dev_err(wm8994->dev, "Failed to get supplies: %d\n", ret);
439		goto err;
440	}
441
442	ret = regulator_bulk_enable(wm8994->num_supplies,
443				    wm8994->supplies);
444	if (ret != 0) {
445		dev_err(wm8994->dev, "Failed to enable supplies: %d\n", ret);
446		goto err_get;
447	}
448
449	ret = wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET);
450	if (ret < 0) {
451		dev_err(wm8994->dev, "Failed to read ID register\n");
452		goto err_enable;
453	}
454	switch (ret) {
455	case 0x1811:
456		devname = "WM1811";
457		if (wm8994->type != WM1811)
458			dev_warn(wm8994->dev, "Device registered as type %d\n",
459				 wm8994->type);
460		wm8994->type = WM1811;
461		break;
462	case 0x8994:
463		devname = "WM8994";
464		if (wm8994->type != WM8994)
465			dev_warn(wm8994->dev, "Device registered as type %d\n",
466				 wm8994->type);
467		wm8994->type = WM8994;
468		break;
469	case 0x8958:
470		devname = "WM8958";
471		if (wm8994->type != WM8958)
472			dev_warn(wm8994->dev, "Device registered as type %d\n",
473				 wm8994->type);
474		wm8994->type = WM8958;
475		break;
476	default:
477		dev_err(wm8994->dev, "Device is not a WM8994, ID is %x\n",
478			ret);
479		ret = -EINVAL;
480		goto err_enable;
481	}
482
483	ret = wm8994_reg_read(wm8994, WM8994_CHIP_REVISION);
484	if (ret < 0) {
485		dev_err(wm8994->dev, "Failed to read revision register: %d\n",
486			ret);
487		goto err_enable;
488	}
489	wm8994->revision = ret;
490
491	switch (wm8994->type) {
492	case WM8994:
493		switch (wm8994->revision) {
494		case 0:
495		case 1:
496			dev_warn(wm8994->dev,
497				 "revision %c not fully supported\n",
498				 'A' + wm8994->revision);
499			break;
500		case 2:
501		case 3:
502			regmap_patch = wm8994_revc_patch;
503			patch_regs = ARRAY_SIZE(wm8994_revc_patch);
504			break;
505		default:
506			break;
507		}
508		break;
509
510	case WM8958:
511		switch (wm8994->revision) {
512		case 0:
513			regmap_patch = wm8958_reva_patch;
514			patch_regs = ARRAY_SIZE(wm8958_reva_patch);
515			break;
516		default:
517			break;
518		}
519		break;
520
521	case WM1811:
522		/* Revision C did not change the relevant layer */
523		if (wm8994->revision > 1)
524			wm8994->revision++;
525		switch (wm8994->revision) {
526		case 0:
527		case 1:
528		case 2:
529		case 3:
530			regmap_patch = wm1811_reva_patch;
531			patch_regs = ARRAY_SIZE(wm1811_reva_patch);
532			break;
533		default:
534			break;
535		}
536		break;
537
538	default:
539		break;
540	}
541
542	dev_info(wm8994->dev, "%s revision %c\n", devname,
543		 'A' + wm8994->revision);
544
545	switch (wm8994->type) {
546	case WM1811:
547		regmap_config = &wm1811_regmap_config;
548		break;
549	case WM8994:
550		regmap_config = &wm8994_regmap_config;
551		break;
552	case WM8958:
553		regmap_config = &wm8958_regmap_config;
554		break;
555	default:
556		dev_err(wm8994->dev, "Unknown device type %d\n", wm8994->type);
557		return -EINVAL;
558	}
559
560	ret = regmap_reinit_cache(wm8994->regmap, regmap_config);
561	if (ret != 0) {
562		dev_err(wm8994->dev, "Failed to reinit register cache: %d\n",
563			ret);
564		return ret;
565	}
566
567	if (regmap_patch) {
568		ret = regmap_register_patch(wm8994->regmap, regmap_patch,
569					    patch_regs);
570		if (ret != 0) {
571			dev_err(wm8994->dev, "Failed to register patch: %d\n",
572				ret);
573			goto err;
574		}
575	}
576
577	if (pdata) {
578		wm8994->irq_base = pdata->irq_base;
579		wm8994->gpio_base = pdata->gpio_base;
580
581		/* GPIO configuration is only applied if it's non-zero */
582		for (i = 0; i < ARRAY_SIZE(pdata->gpio_defaults); i++) {
583			if (pdata->gpio_defaults[i]) {
584				wm8994_set_bits(wm8994, WM8994_GPIO_1 + i,
585						0xffff,
586						pdata->gpio_defaults[i]);
587			}
588		}
589
590		wm8994->ldo_ena_always_driven = pdata->ldo_ena_always_driven;
591
592		if (pdata->spkmode_pu)
593			pulls |= WM8994_SPKMODE_PU;
594	}
595
596	/* Disable unneeded pulls */
597	wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
598			WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD |
599			WM8994_SPKMODE_PU | WM8994_CSNADDR_PD,
600			pulls);
601
602	/* In some system designs where the regulators are not in use,
603	 * we can achieve a small reduction in leakage currents by
604	 * floating LDO outputs.  This bit makes no difference if the
605	 * LDOs are enabled, it only affects cases where the LDOs were
606	 * in operation and are then disabled.
607	 */
608	for (i = 0; i < WM8994_NUM_LDO_REGS; i++) {
609		if (wm8994_ldo_in_use(pdata, i))
610			wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
611					WM8994_LDO1_DISCH, WM8994_LDO1_DISCH);
612		else
613			wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
614					WM8994_LDO1_DISCH, 0);
615	}
616
617	wm8994_irq_init(wm8994);
618
619	ret = mfd_add_devices(wm8994->dev, -1,
620			      wm8994_devs, ARRAY_SIZE(wm8994_devs),
621			      NULL, 0);
622	if (ret != 0) {
623		dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
624		goto err_irq;
625	}
626
627	pm_runtime_enable(wm8994->dev);
628	pm_runtime_resume(wm8994->dev);
629
630	return 0;
631
632err_irq:
633	wm8994_irq_exit(wm8994);
634err_enable:
635	regulator_bulk_disable(wm8994->num_supplies,
636			       wm8994->supplies);
637err_get:
638	regulator_bulk_free(wm8994->num_supplies, wm8994->supplies);
639err:
640	mfd_remove_devices(wm8994->dev);
641	return ret;
642}
643
644static __devexit void wm8994_device_exit(struct wm8994 *wm8994)
645{
646	pm_runtime_disable(wm8994->dev);
647	mfd_remove_devices(wm8994->dev);
648	wm8994_irq_exit(wm8994);
649	regulator_bulk_disable(wm8994->num_supplies,
650			       wm8994->supplies);
651	regulator_bulk_free(wm8994->num_supplies, wm8994->supplies);
652}
653
654static const struct of_device_id wm8994_of_match[] = {
655	{ .compatible = "wlf,wm1811", },
656	{ .compatible = "wlf,wm8994", },
657	{ .compatible = "wlf,wm8958", },
658	{ }
659};
660MODULE_DEVICE_TABLE(of, wm8994_of_match);
661
662static __devinit int wm8994_i2c_probe(struct i2c_client *i2c,
663				      const struct i2c_device_id *id)
664{
665	struct wm8994 *wm8994;
666	int ret;
667
668	wm8994 = devm_kzalloc(&i2c->dev, sizeof(struct wm8994), GFP_KERNEL);
669	if (wm8994 == NULL)
670		return -ENOMEM;
671
672	i2c_set_clientdata(i2c, wm8994);
673	wm8994->dev = &i2c->dev;
674	wm8994->irq = i2c->irq;
675	wm8994->type = id->driver_data;
676
677	wm8994->regmap = devm_regmap_init_i2c(i2c, &wm8994_base_regmap_config);
678	if (IS_ERR(wm8994->regmap)) {
679		ret = PTR_ERR(wm8994->regmap);
680		dev_err(wm8994->dev, "Failed to allocate register map: %d\n",
681			ret);
682		return ret;
683	}
684
685	return wm8994_device_init(wm8994, i2c->irq);
686}
687
688static __devexit int wm8994_i2c_remove(struct i2c_client *i2c)
689{
690	struct wm8994 *wm8994 = i2c_get_clientdata(i2c);
691
692	wm8994_device_exit(wm8994);
693
694	return 0;
695}
696
697static const struct i2c_device_id wm8994_i2c_id[] = {
698	{ "wm1811", WM1811 },
699	{ "wm1811a", WM1811 },
700	{ "wm8994", WM8994 },
701	{ "wm8958", WM8958 },
702	{ }
703};
704MODULE_DEVICE_TABLE(i2c, wm8994_i2c_id);
705
706static UNIVERSAL_DEV_PM_OPS(wm8994_pm_ops, wm8994_suspend, wm8994_resume,
707			    NULL);
708
709static struct i2c_driver wm8994_i2c_driver = {
710	.driver = {
711		.name = "wm8994",
712		.owner = THIS_MODULE,
713		.pm = &wm8994_pm_ops,
714		.of_match_table = wm8994_of_match,
715	},
716	.probe = wm8994_i2c_probe,
717	.remove = __devexit_p(wm8994_i2c_remove),
718	.id_table = wm8994_i2c_id,
719};
720
721static int __init wm8994_i2c_init(void)
722{
723	int ret;
724
725	ret = i2c_add_driver(&wm8994_i2c_driver);
726	if (ret != 0)
727		pr_err("Failed to register wm8994 I2C driver: %d\n", ret);
728
729	return ret;
730}
731module_init(wm8994_i2c_init);
732
733static void __exit wm8994_i2c_exit(void)
734{
735	i2c_del_driver(&wm8994_i2c_driver);
736}
737module_exit(wm8994_i2c_exit);
738
739MODULE_DESCRIPTION("Core support for the WM8994 audio CODEC");
740MODULE_LICENSE("GPL");
741MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
742