Merge tag 'regmap-3.4' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap
[~shefty/rdma-dev.git] / drivers / mfd / wm8994-core.c
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  */
39 int 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 }
51 EXPORT_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  */
61 int 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  */
74 int wm8994_reg_write(struct wm8994 *wm8994, unsigned short reg,
75                      unsigned short val)
76 {
77         return regmap_write(wm8994->regmap, reg, val);
78 }
79 EXPORT_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  */
89 int 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 }
94 EXPORT_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  */
104 int 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 }
109 EXPORT_SYMBOL_GPL(wm8994_set_bits);
110
111 static 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
124 static 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
132 static 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
140 static 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  */
160 static 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
172 static const char *wm8994_main_supplies[] = {
173         "DBVDD",
174         "DCVDD",
175         "AVDD1",
176         "AVDD2",
177         "CPVDD",
178         "SPKVDD1",
179         "SPKVDD2",
180 };
181
182 static 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
195 static 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_cache_only(wm8994->regmap, true);
287         regcache_mark_dirty(wm8994->regmap);
288
289         wm8994->suspended = true;
290
291         ret = regulator_bulk_disable(wm8994->num_supplies,
292                                      wm8994->supplies);
293         if (ret != 0) {
294                 dev_err(dev, "Failed to disable supplies: %d\n", ret);
295                 return ret;
296         }
297
298         return 0;
299 }
300
301 static int wm8994_resume(struct device *dev)
302 {
303         struct wm8994 *wm8994 = dev_get_drvdata(dev);
304         int ret;
305
306         /* We may have lied to the PM core about suspending */
307         if (!wm8994->suspended)
308                 return 0;
309
310         ret = regulator_bulk_enable(wm8994->num_supplies,
311                                     wm8994->supplies);
312         if (ret != 0) {
313                 dev_err(dev, "Failed to enable supplies: %d\n", ret);
314                 return ret;
315         }
316
317         regcache_cache_only(wm8994->regmap, false);
318         ret = regcache_sync(wm8994->regmap);
319         if (ret != 0) {
320                 dev_err(dev, "Failed to restore register map: %d\n", ret);
321                 goto err_enable;
322         }
323
324         /* Disable LDO pulldowns while the device is active */
325         wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
326                         WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD,
327                         0);
328
329         wm8994->suspended = false;
330
331         return 0;
332
333 err_enable:
334         regulator_bulk_disable(wm8994->num_supplies, wm8994->supplies);
335
336         return ret;
337 }
338 #endif
339
340 #ifdef CONFIG_REGULATOR
341 static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo)
342 {
343         struct wm8994_ldo_pdata *ldo_pdata;
344
345         if (!pdata)
346                 return 0;
347
348         ldo_pdata = &pdata->ldo[ldo];
349
350         if (!ldo_pdata->init_data)
351                 return 0;
352
353         return ldo_pdata->init_data->num_consumer_supplies != 0;
354 }
355 #else
356 static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo)
357 {
358         return 0;
359 }
360 #endif
361
362 static const __devinitdata struct reg_default wm8994_revc_patch[] = {
363         { 0x102, 0x3 },
364         { 0x56, 0x3 },
365         { 0x817, 0x0 },
366         { 0x102, 0x0 },
367 };
368
369 static const __devinitdata struct reg_default wm8958_reva_patch[] = {
370         { 0x102, 0x3 },
371         { 0xcb, 0x81 },
372         { 0x817, 0x0 },
373         { 0x102, 0x0 },
374 };
375
376 static const __devinitdata struct reg_default wm1811_reva_patch[] = {
377         { 0x102, 0x3 },
378         { 0x56, 0x7 },
379         { 0x5d, 0x7e },
380         { 0x5e, 0x0 },
381         { 0x102, 0x0 },
382 };
383
384 /*
385  * Instantiate the generic non-control parts of the device.
386  */
387 static __devinit int wm8994_device_init(struct wm8994 *wm8994, int irq)
388 {
389         struct wm8994_pdata *pdata = wm8994->dev->platform_data;
390         struct regmap_config *regmap_config;
391         const struct reg_default *regmap_patch = NULL;
392         const char *devname;
393         int ret, i, patch_regs;
394         int pulls = 0;
395
396         dev_set_drvdata(wm8994->dev, wm8994);
397
398         /* Add the on-chip regulators first for bootstrapping */
399         ret = mfd_add_devices(wm8994->dev, -1,
400                               wm8994_regulator_devs,
401                               ARRAY_SIZE(wm8994_regulator_devs),
402                               NULL, 0);
403         if (ret != 0) {
404                 dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
405                 goto err;
406         }
407
408         switch (wm8994->type) {
409         case WM1811:
410                 wm8994->num_supplies = ARRAY_SIZE(wm1811_main_supplies);
411                 break;
412         case WM8994:
413                 wm8994->num_supplies = ARRAY_SIZE(wm8994_main_supplies);
414                 break;
415         case WM8958:
416                 wm8994->num_supplies = ARRAY_SIZE(wm8958_main_supplies);
417                 break;
418         default:
419                 BUG();
420                 goto err;
421         }
422
423         wm8994->supplies = devm_kzalloc(wm8994->dev,
424                                         sizeof(struct regulator_bulk_data) *
425                                         wm8994->num_supplies, GFP_KERNEL);
426         if (!wm8994->supplies) {
427                 ret = -ENOMEM;
428                 goto err;
429         }
430
431         switch (wm8994->type) {
432         case WM1811:
433                 for (i = 0; i < ARRAY_SIZE(wm1811_main_supplies); i++)
434                         wm8994->supplies[i].supply = wm1811_main_supplies[i];
435                 break;
436         case WM8994:
437                 for (i = 0; i < ARRAY_SIZE(wm8994_main_supplies); i++)
438                         wm8994->supplies[i].supply = wm8994_main_supplies[i];
439                 break;
440         case WM8958:
441                 for (i = 0; i < ARRAY_SIZE(wm8958_main_supplies); i++)
442                         wm8994->supplies[i].supply = wm8958_main_supplies[i];
443                 break;
444         default:
445                 BUG();
446                 goto err;
447         }
448                 
449         ret = regulator_bulk_get(wm8994->dev, wm8994->num_supplies,
450                                  wm8994->supplies);
451         if (ret != 0) {
452                 dev_err(wm8994->dev, "Failed to get supplies: %d\n", ret);
453                 goto err;
454         }
455
456         ret = regulator_bulk_enable(wm8994->num_supplies,
457                                     wm8994->supplies);
458         if (ret != 0) {
459                 dev_err(wm8994->dev, "Failed to enable supplies: %d\n", ret);
460                 goto err_get;
461         }
462
463         ret = wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET);
464         if (ret < 0) {
465                 dev_err(wm8994->dev, "Failed to read ID register\n");
466                 goto err_enable;
467         }
468         switch (ret) {
469         case 0x1811:
470                 devname = "WM1811";
471                 if (wm8994->type != WM1811)
472                         dev_warn(wm8994->dev, "Device registered as type %d\n",
473                                  wm8994->type);
474                 wm8994->type = WM1811;
475                 break;
476         case 0x8994:
477                 devname = "WM8994";
478                 if (wm8994->type != WM8994)
479                         dev_warn(wm8994->dev, "Device registered as type %d\n",
480                                  wm8994->type);
481                 wm8994->type = WM8994;
482                 break;
483         case 0x8958:
484                 devname = "WM8958";
485                 if (wm8994->type != WM8958)
486                         dev_warn(wm8994->dev, "Device registered as type %d\n",
487                                  wm8994->type);
488                 wm8994->type = WM8958;
489                 break;
490         default:
491                 dev_err(wm8994->dev, "Device is not a WM8994, ID is %x\n",
492                         ret);
493                 ret = -EINVAL;
494                 goto err_enable;
495         }
496
497         ret = wm8994_reg_read(wm8994, WM8994_CHIP_REVISION);
498         if (ret < 0) {
499                 dev_err(wm8994->dev, "Failed to read revision register: %d\n",
500                         ret);
501                 goto err_enable;
502         }
503         wm8994->revision = ret;
504
505         switch (wm8994->type) {
506         case WM8994:
507                 switch (wm8994->revision) {
508                 case 0:
509                 case 1:
510                         dev_warn(wm8994->dev,
511                                  "revision %c not fully supported\n",
512                                  'A' + wm8994->revision);
513                         break;
514                 case 2:
515                 case 3:
516                         regmap_patch = wm8994_revc_patch;
517                         patch_regs = ARRAY_SIZE(wm8994_revc_patch);
518                         break;
519                 default:
520                         break;
521                 }
522                 break;
523
524         case WM8958:
525                 switch (wm8994->revision) {
526                 case 0:
527                         regmap_patch = wm8958_reva_patch;
528                         patch_regs = ARRAY_SIZE(wm8958_reva_patch);
529                         break;
530                 default:
531                         break;
532                 }
533                 break;
534
535         case WM1811:
536                 /* Revision C did not change the relevant layer */
537                 if (wm8994->revision > 1)
538                         wm8994->revision++;
539                 switch (wm8994->revision) {
540                 case 0:
541                 case 1:
542                 case 2:
543                 case 3:
544                         regmap_patch = wm1811_reva_patch;
545                         patch_regs = ARRAY_SIZE(wm1811_reva_patch);
546                         break;
547                 default:
548                         break;
549                 }
550                 break;
551
552         default:
553                 break;
554         }
555
556         dev_info(wm8994->dev, "%s revision %c\n", devname,
557                  'A' + wm8994->revision);
558
559         switch (wm8994->type) {
560         case WM1811:
561                 regmap_config = &wm1811_regmap_config;
562                 break;
563         case WM8994:
564                 regmap_config = &wm8994_regmap_config;
565                 break;
566         case WM8958:
567                 regmap_config = &wm8958_regmap_config;
568                 break;
569         default:
570                 dev_err(wm8994->dev, "Unknown device type %d\n", wm8994->type);
571                 return -EINVAL;
572         }
573
574         ret = regmap_reinit_cache(wm8994->regmap, regmap_config);
575         if (ret != 0) {
576                 dev_err(wm8994->dev, "Failed to reinit register cache: %d\n",
577                         ret);
578                 return ret;
579         }
580
581         if (regmap_patch) {
582                 ret = regmap_register_patch(wm8994->regmap, regmap_patch,
583                                             patch_regs);
584                 if (ret != 0) {
585                         dev_err(wm8994->dev, "Failed to register patch: %d\n",
586                                 ret);
587                         goto err;
588                 }
589         }
590
591         if (pdata) {
592                 wm8994->irq_base = pdata->irq_base;
593                 wm8994->gpio_base = pdata->gpio_base;
594
595                 /* GPIO configuration is only applied if it's non-zero */
596                 for (i = 0; i < ARRAY_SIZE(pdata->gpio_defaults); i++) {
597                         if (pdata->gpio_defaults[i]) {
598                                 wm8994_set_bits(wm8994, WM8994_GPIO_1 + i,
599                                                 0xffff,
600                                                 pdata->gpio_defaults[i]);
601                         }
602                 }
603
604                 wm8994->ldo_ena_always_driven = pdata->ldo_ena_always_driven;
605
606                 if (pdata->spkmode_pu)
607                         pulls |= WM8994_SPKMODE_PU;
608         }
609
610         /* Disable unneeded pulls */
611         wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
612                         WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD |
613                         WM8994_SPKMODE_PU | WM8994_CSNADDR_PD,
614                         pulls);
615
616         /* In some system designs where the regulators are not in use,
617          * we can achieve a small reduction in leakage currents by
618          * floating LDO outputs.  This bit makes no difference if the
619          * LDOs are enabled, it only affects cases where the LDOs were
620          * in operation and are then disabled.
621          */
622         for (i = 0; i < WM8994_NUM_LDO_REGS; i++) {
623                 if (wm8994_ldo_in_use(pdata, i))
624                         wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
625                                         WM8994_LDO1_DISCH, WM8994_LDO1_DISCH);
626                 else
627                         wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
628                                         WM8994_LDO1_DISCH, 0);
629         }
630
631         wm8994_irq_init(wm8994);
632
633         ret = mfd_add_devices(wm8994->dev, -1,
634                               wm8994_devs, ARRAY_SIZE(wm8994_devs),
635                               NULL, 0);
636         if (ret != 0) {
637                 dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
638                 goto err_irq;
639         }
640
641         pm_runtime_enable(wm8994->dev);
642         pm_runtime_resume(wm8994->dev);
643
644         return 0;
645
646 err_irq:
647         wm8994_irq_exit(wm8994);
648 err_enable:
649         regulator_bulk_disable(wm8994->num_supplies,
650                                wm8994->supplies);
651 err_get:
652         regulator_bulk_free(wm8994->num_supplies, wm8994->supplies);
653 err:
654         mfd_remove_devices(wm8994->dev);
655         return ret;
656 }
657
658 static __devexit void wm8994_device_exit(struct wm8994 *wm8994)
659 {
660         pm_runtime_disable(wm8994->dev);
661         mfd_remove_devices(wm8994->dev);
662         wm8994_irq_exit(wm8994);
663         regulator_bulk_disable(wm8994->num_supplies,
664                                wm8994->supplies);
665         regulator_bulk_free(wm8994->num_supplies, wm8994->supplies);
666 }
667
668 static const struct of_device_id wm8994_of_match[] = {
669         { .compatible = "wlf,wm1811", },
670         { .compatible = "wlf,wm8994", },
671         { .compatible = "wlf,wm8958", },
672         { }
673 };
674 MODULE_DEVICE_TABLE(of, wm8994_of_match);
675
676 static __devinit int wm8994_i2c_probe(struct i2c_client *i2c,
677                                       const struct i2c_device_id *id)
678 {
679         struct wm8994 *wm8994;
680         int ret;
681
682         wm8994 = devm_kzalloc(&i2c->dev, sizeof(struct wm8994), GFP_KERNEL);
683         if (wm8994 == NULL)
684                 return -ENOMEM;
685
686         i2c_set_clientdata(i2c, wm8994);
687         wm8994->dev = &i2c->dev;
688         wm8994->irq = i2c->irq;
689         wm8994->type = id->driver_data;
690
691         wm8994->regmap = devm_regmap_init_i2c(i2c, &wm8994_base_regmap_config);
692         if (IS_ERR(wm8994->regmap)) {
693                 ret = PTR_ERR(wm8994->regmap);
694                 dev_err(wm8994->dev, "Failed to allocate register map: %d\n",
695                         ret);
696                 return ret;
697         }
698
699         return wm8994_device_init(wm8994, i2c->irq);
700 }
701
702 static __devexit int wm8994_i2c_remove(struct i2c_client *i2c)
703 {
704         struct wm8994 *wm8994 = i2c_get_clientdata(i2c);
705
706         wm8994_device_exit(wm8994);
707
708         return 0;
709 }
710
711 static const struct i2c_device_id wm8994_i2c_id[] = {
712         { "wm1811", WM1811 },
713         { "wm1811a", WM1811 },
714         { "wm8994", WM8994 },
715         { "wm8958", WM8958 },
716         { }
717 };
718 MODULE_DEVICE_TABLE(i2c, wm8994_i2c_id);
719
720 static UNIVERSAL_DEV_PM_OPS(wm8994_pm_ops, wm8994_suspend, wm8994_resume,
721                             NULL);
722
723 static struct i2c_driver wm8994_i2c_driver = {
724         .driver = {
725                 .name = "wm8994",
726                 .owner = THIS_MODULE,
727                 .pm = &wm8994_pm_ops,
728                 .of_match_table = wm8994_of_match,
729         },
730         .probe = wm8994_i2c_probe,
731         .remove = __devexit_p(wm8994_i2c_remove),
732         .id_table = wm8994_i2c_id,
733 };
734
735 static int __init wm8994_i2c_init(void)
736 {
737         int ret;
738
739         ret = i2c_add_driver(&wm8994_i2c_driver);
740         if (ret != 0)
741                 pr_err("Failed to register wm8994 I2C driver: %d\n", ret);
742
743         return ret;
744 }
745 module_init(wm8994_i2c_init);
746
747 static void __exit wm8994_i2c_exit(void)
748 {
749         i2c_del_driver(&wm8994_i2c_driver);
750 }
751 module_exit(wm8994_i2c_exit);
752
753 MODULE_DESCRIPTION("Core support for the WM8994 audio CODEC");
754 MODULE_LICENSE("GPL");
755 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");