wm8994-core.c revision a8a8fc287dd7497b3adb2f2952513849ab6506eb 
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	switch (wm8994->type) {
260	case WM1811:
261		ret = wm8994_reg_read(wm8994, WM8994_ANTIPOP_2);
262		if (ret < 0) {
263			dev_err(dev, "Failed to read jackdet: %d\n", ret);
264		} else if (ret & WM1811_JACKDET_MODE_MASK) {
265			dev_dbg(dev, "CODEC still active, ignoring suspend\n");
266			return 0;
267		}
268		break;
269	default:
270		break;
271	}
272
273	/* Disable LDO pulldowns while the device is suspended if we
274	 * don't know that something will be driving them. */
275	if (!wm8994->ldo_ena_always_driven)
276		wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
277				WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD,
278				WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD);
279
280	/* Explicitly put the device into reset in case regulators
281	 * don't get disabled in order to ensure consistent restart.
282	 */
283	wm8994_reg_write(wm8994, WM8994_SOFTWARE_RESET,
284			 wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET));
285
286	regcache_mark_dirty(wm8994->regmap);
287
288	/* Restore GPIO registers to prevent problems with mismatched
289	 * pin configurations.
290	 */
291	ret = regcache_sync_region(wm8994->regmap, WM8994_GPIO_1,
292				   WM8994_GPIO_11);
293	if (ret != 0)
294		dev_err(dev, "Failed to restore GPIO registers: %d\n", ret);
295
296	/* In case one of the GPIOs is used as a wake input. */
297	ret = regcache_sync_region(wm8994->regmap,
298				   WM8994_INTERRUPT_STATUS_1_MASK,
299				   WM8994_INTERRUPT_STATUS_1_MASK);
300	if (ret != 0)
301		dev_err(dev, "Failed to restore interrupt mask: %d\n", ret);
302
303	regcache_cache_only(wm8994->regmap, true);
304	wm8994->suspended = true;
305
306	ret = regulator_bulk_disable(wm8994->num_supplies,
307				     wm8994->supplies);
308	if (ret != 0) {
309		dev_err(dev, "Failed to disable supplies: %d\n", ret);
310		return ret;
311	}
312
313	return 0;
314}
315
316static int wm8994_resume(struct device *dev)
317{
318	struct wm8994 *wm8994 = dev_get_drvdata(dev);
319	int ret;
320
321	/* We may have lied to the PM core about suspending */
322	if (!wm8994->suspended)
323		return 0;
324
325	ret = regulator_bulk_enable(wm8994->num_supplies,
326				    wm8994->supplies);
327	if (ret != 0) {
328		dev_err(dev, "Failed to enable supplies: %d\n", ret);
329		return ret;
330	}
331
332	regcache_cache_only(wm8994->regmap, false);
333	ret = regcache_sync(wm8994->regmap);
334	if (ret != 0) {
335		dev_err(dev, "Failed to restore register map: %d\n", ret);
336		goto err_enable;
337	}
338
339	/* Disable LDO pulldowns while the device is active */
340	wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
341			WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD,
342			0);
343
344	wm8994->suspended = false;
345
346	return 0;
347
348err_enable:
349	regulator_bulk_disable(wm8994->num_supplies, wm8994->supplies);
350
351	return ret;
352}
353#endif
354
355#ifdef CONFIG_REGULATOR
356static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo)
357{
358	struct wm8994_ldo_pdata *ldo_pdata;
359
360	if (!pdata)
361		return 0;
362
363	ldo_pdata = &pdata->ldo[ldo];
364
365	if (!ldo_pdata->init_data)
366		return 0;
367
368	return ldo_pdata->init_data->num_consumer_supplies != 0;
369}
370#else
371static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo)
372{
373	return 0;
374}
375#endif
376
377static const __devinitconst struct reg_default wm8994_revc_patch[] = {
378	{ 0x102, 0x3 },
379	{ 0x56, 0x3 },
380	{ 0x817, 0x0 },
381	{ 0x102, 0x0 },
382};
383
384static const __devinitconst struct reg_default wm8958_reva_patch[] = {
385	{ 0x102, 0x3 },
386	{ 0xcb, 0x81 },
387	{ 0x817, 0x0 },
388	{ 0x102, 0x0 },
389};
390
391static const __devinitconst struct reg_default wm1811_reva_patch[] = {
392	{ 0x102, 0x3 },
393	{ 0x56, 0xc07 },
394	{ 0x5d, 0x7e },
395	{ 0x5e, 0x0 },
396	{ 0x102, 0x0 },
397};
398
399/*
400 * Instantiate the generic non-control parts of the device.
401 */
402static __devinit int wm8994_device_init(struct wm8994 *wm8994, int irq)
403{
404	struct wm8994_pdata *pdata;
405	struct regmap_config *regmap_config;
406	const struct reg_default *regmap_patch = NULL;
407	const char *devname;
408	int ret, i, patch_regs;
409	int pulls = 0;
410
411	if (dev_get_platdata(wm8994->dev)) {
412		pdata = dev_get_platdata(wm8994->dev);
413		wm8994->pdata = *pdata;
414	}
415	pdata = &wm8994->pdata;
416
417	dev_set_drvdata(wm8994->dev, wm8994);
418
419	/* Add the on-chip regulators first for bootstrapping */
420	ret = mfd_add_devices(wm8994->dev, -1,
421			      wm8994_regulator_devs,
422			      ARRAY_SIZE(wm8994_regulator_devs),
423			      NULL, 0, NULL);
424	if (ret != 0) {
425		dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
426		goto err;
427	}
428
429	switch (wm8994->type) {
430	case WM1811:
431		wm8994->num_supplies = ARRAY_SIZE(wm1811_main_supplies);
432		break;
433	case WM8994:
434		wm8994->num_supplies = ARRAY_SIZE(wm8994_main_supplies);
435		break;
436	case WM8958:
437		wm8994->num_supplies = ARRAY_SIZE(wm8958_main_supplies);
438		break;
439	default:
440		BUG();
441		goto err;
442	}
443
444	wm8994->supplies = devm_kzalloc(wm8994->dev,
445					sizeof(struct regulator_bulk_data) *
446					wm8994->num_supplies, GFP_KERNEL);
447	if (!wm8994->supplies) {
448		ret = -ENOMEM;
449		goto err;
450	}
451
452	switch (wm8994->type) {
453	case WM1811:
454		for (i = 0; i < ARRAY_SIZE(wm1811_main_supplies); i++)
455			wm8994->supplies[i].supply = wm1811_main_supplies[i];
456		break;
457	case WM8994:
458		for (i = 0; i < ARRAY_SIZE(wm8994_main_supplies); i++)
459			wm8994->supplies[i].supply = wm8994_main_supplies[i];
460		break;
461	case WM8958:
462		for (i = 0; i < ARRAY_SIZE(wm8958_main_supplies); i++)
463			wm8994->supplies[i].supply = wm8958_main_supplies[i];
464		break;
465	default:
466		BUG();
467		goto err;
468	}
469
470	ret = regulator_bulk_get(wm8994->dev, wm8994->num_supplies,
471				 wm8994->supplies);
472	if (ret != 0) {
473		dev_err(wm8994->dev, "Failed to get supplies: %d\n", ret);
474		goto err;
475	}
476
477	ret = regulator_bulk_enable(wm8994->num_supplies,
478				    wm8994->supplies);
479	if (ret != 0) {
480		dev_err(wm8994->dev, "Failed to enable supplies: %d\n", ret);
481		goto err_get;
482	}
483
484	ret = wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET);
485	if (ret < 0) {
486		dev_err(wm8994->dev, "Failed to read ID register\n");
487		goto err_enable;
488	}
489	switch (ret) {
490	case 0x1811:
491		devname = "WM1811";
492		if (wm8994->type != WM1811)
493			dev_warn(wm8994->dev, "Device registered as type %d\n",
494				 wm8994->type);
495		wm8994->type = WM1811;
496		break;
497	case 0x8994:
498		devname = "WM8994";
499		if (wm8994->type != WM8994)
500			dev_warn(wm8994->dev, "Device registered as type %d\n",
501				 wm8994->type);
502		wm8994->type = WM8994;
503		break;
504	case 0x8958:
505		devname = "WM8958";
506		if (wm8994->type != WM8958)
507			dev_warn(wm8994->dev, "Device registered as type %d\n",
508				 wm8994->type);
509		wm8994->type = WM8958;
510		break;
511	default:
512		dev_err(wm8994->dev, "Device is not a WM8994, ID is %x\n",
513			ret);
514		ret = -EINVAL;
515		goto err_enable;
516	}
517
518	ret = wm8994_reg_read(wm8994, WM8994_CHIP_REVISION);
519	if (ret < 0) {
520		dev_err(wm8994->dev, "Failed to read revision register: %d\n",
521			ret);
522		goto err_enable;
523	}
524	wm8994->revision = ret & WM8994_CHIP_REV_MASK;
525	wm8994->cust_id = (ret & WM8994_CUST_ID_MASK) >> WM8994_CUST_ID_SHIFT;
526
527	switch (wm8994->type) {
528	case WM8994:
529		switch (wm8994->revision) {
530		case 0:
531		case 1:
532			dev_warn(wm8994->dev,
533				 "revision %c not fully supported\n",
534				 'A' + wm8994->revision);
535			break;
536		case 2:
537		case 3:
538			regmap_patch = wm8994_revc_patch;
539			patch_regs = ARRAY_SIZE(wm8994_revc_patch);
540			break;
541		default:
542			break;
543		}
544		break;
545
546	case WM8958:
547		switch (wm8994->revision) {
548		case 0:
549			regmap_patch = wm8958_reva_patch;
550			patch_regs = ARRAY_SIZE(wm8958_reva_patch);
551			break;
552		default:
553			break;
554		}
555		break;
556
557	case WM1811:
558		/* Revision C did not change the relevant layer */
559		if (wm8994->revision > 1)
560			wm8994->revision++;
561		switch (wm8994->revision) {
562		case 0:
563		case 1:
564		case 2:
565		case 3:
566			regmap_patch = wm1811_reva_patch;
567			patch_regs = ARRAY_SIZE(wm1811_reva_patch);
568			break;
569		default:
570			break;
571		}
572		break;
573
574	default:
575		break;
576	}
577
578	dev_info(wm8994->dev, "%s revision %c CUST_ID %02x\n", devname,
579		 'A' + wm8994->revision, wm8994->cust_id);
580
581	switch (wm8994->type) {
582	case WM1811:
583		regmap_config = &wm1811_regmap_config;
584		break;
585	case WM8994:
586		regmap_config = &wm8994_regmap_config;
587		break;
588	case WM8958:
589		regmap_config = &wm8958_regmap_config;
590		break;
591	default:
592		dev_err(wm8994->dev, "Unknown device type %d\n", wm8994->type);
593		return -EINVAL;
594	}
595
596	ret = regmap_reinit_cache(wm8994->regmap, regmap_config);
597	if (ret != 0) {
598		dev_err(wm8994->dev, "Failed to reinit register cache: %d\n",
599			ret);
600		return ret;
601	}
602
603	if (regmap_patch) {
604		ret = regmap_register_patch(wm8994->regmap, regmap_patch,
605					    patch_regs);
606		if (ret != 0) {
607			dev_err(wm8994->dev, "Failed to register patch: %d\n",
608				ret);
609			goto err;
610		}
611	}
612
613	wm8994->irq_base = pdata->irq_base;
614	wm8994->gpio_base = pdata->gpio_base;
615
616	/* GPIO configuration is only applied if it's non-zero */
617	for (i = 0; i < ARRAY_SIZE(pdata->gpio_defaults); i++) {
618		if (pdata->gpio_defaults[i]) {
619			wm8994_set_bits(wm8994, WM8994_GPIO_1 + i,
620					0xffff, pdata->gpio_defaults[i]);
621		}
622	}
623
624	wm8994->ldo_ena_always_driven = pdata->ldo_ena_always_driven;
625
626	if (pdata->spkmode_pu)
627		pulls |= WM8994_SPKMODE_PU;
628
629	/* Disable unneeded pulls */
630	wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
631			WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD |
632			WM8994_SPKMODE_PU | WM8994_CSNADDR_PD,
633			pulls);
634
635	/* In some system designs where the regulators are not in use,
636	 * we can achieve a small reduction in leakage currents by
637	 * floating LDO outputs.  This bit makes no difference if the
638	 * LDOs are enabled, it only affects cases where the LDOs were
639	 * in operation and are then disabled.
640	 */
641	for (i = 0; i < WM8994_NUM_LDO_REGS; i++) {
642		if (wm8994_ldo_in_use(pdata, i))
643			wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
644					WM8994_LDO1_DISCH, WM8994_LDO1_DISCH);
645		else
646			wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
647					WM8994_LDO1_DISCH, 0);
648	}
649
650	wm8994_irq_init(wm8994);
651
652	ret = mfd_add_devices(wm8994->dev, -1,
653			      wm8994_devs, ARRAY_SIZE(wm8994_devs),
654			      NULL, 0, NULL);
655	if (ret != 0) {
656		dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
657		goto err_irq;
658	}
659
660	pm_runtime_enable(wm8994->dev);
661	pm_runtime_idle(wm8994->dev);
662
663	return 0;
664
665err_irq:
666	wm8994_irq_exit(wm8994);
667err_enable:
668	regulator_bulk_disable(wm8994->num_supplies,
669			       wm8994->supplies);
670err_get:
671	regulator_bulk_free(wm8994->num_supplies, wm8994->supplies);
672err:
673	mfd_remove_devices(wm8994->dev);
674	return ret;
675}
676
677static __devexit void wm8994_device_exit(struct wm8994 *wm8994)
678{
679	pm_runtime_disable(wm8994->dev);
680	mfd_remove_devices(wm8994->dev);
681	wm8994_irq_exit(wm8994);
682	regulator_bulk_disable(wm8994->num_supplies,
683			       wm8994->supplies);
684	regulator_bulk_free(wm8994->num_supplies, wm8994->supplies);
685}
686
687static const struct of_device_id wm8994_of_match[] = {
688	{ .compatible = "wlf,wm1811", },
689	{ .compatible = "wlf,wm8994", },
690	{ .compatible = "wlf,wm8958", },
691	{ }
692};
693MODULE_DEVICE_TABLE(of, wm8994_of_match);
694
695static __devinit int wm8994_i2c_probe(struct i2c_client *i2c,
696				      const struct i2c_device_id *id)
697{
698	struct wm8994 *wm8994;
699	int ret;
700
701	wm8994 = devm_kzalloc(&i2c->dev, sizeof(struct wm8994), GFP_KERNEL);
702	if (wm8994 == NULL)
703		return -ENOMEM;
704
705	i2c_set_clientdata(i2c, wm8994);
706	wm8994->dev = &i2c->dev;
707	wm8994->irq = i2c->irq;
708	wm8994->type = id->driver_data;
709
710	wm8994->regmap = devm_regmap_init_i2c(i2c, &wm8994_base_regmap_config);
711	if (IS_ERR(wm8994->regmap)) {
712		ret = PTR_ERR(wm8994->regmap);
713		dev_err(wm8994->dev, "Failed to allocate register map: %d\n",
714			ret);
715		return ret;
716	}
717
718	return wm8994_device_init(wm8994, i2c->irq);
719}
720
721static __devexit int wm8994_i2c_remove(struct i2c_client *i2c)
722{
723	struct wm8994 *wm8994 = i2c_get_clientdata(i2c);
724
725	wm8994_device_exit(wm8994);
726
727	return 0;
728}
729
730static const struct i2c_device_id wm8994_i2c_id[] = {
731	{ "wm1811", WM1811 },
732	{ "wm1811a", WM1811 },
733	{ "wm8994", WM8994 },
734	{ "wm8958", WM8958 },
735	{ }
736};
737MODULE_DEVICE_TABLE(i2c, wm8994_i2c_id);
738
739static UNIVERSAL_DEV_PM_OPS(wm8994_pm_ops, wm8994_suspend, wm8994_resume,
740			    NULL);
741
742static struct i2c_driver wm8994_i2c_driver = {
743	.driver = {
744		.name = "wm8994",
745		.owner = THIS_MODULE,
746		.pm = &wm8994_pm_ops,
747		.of_match_table = wm8994_of_match,
748	},
749	.probe = wm8994_i2c_probe,
750	.remove = __devexit_p(wm8994_i2c_remove),
751	.id_table = wm8994_i2c_id,
752};
753
754module_i2c_driver(wm8994_i2c_driver);
755
756MODULE_DESCRIPTION("Core support for the WM8994 audio CODEC");
757MODULE_LICENSE("GPL");
758MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
759