1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * wm8994-core.c -- Device access for Wolfson WM8994
4 *
5 * Copyright 2009 Wolfson Microelectronics PLC.
6 *
7 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
8 */
9
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/slab.h>
13 #include <linux/i2c.h>
14 #include <linux/err.h>
15 #include <linux/delay.h>
16 #include <linux/mfd/core.h>
17 #include <linux/of.h>
18 #include <linux/of_device.h>
19 #include <linux/pm_runtime.h>
20 #include <linux/regmap.h>
21 #include <linux/regulator/consumer.h>
22 #include <linux/regulator/machine.h>
23
24 #include <linux/mfd/wm8994/core.h>
25 #include <linux/mfd/wm8994/pdata.h>
26 #include <linux/mfd/wm8994/registers.h>
27
28 #include "wm8994.h"
29
30 static const struct mfd_cell wm8994_regulator_devs[] = {
31 {
32 .name = "wm8994-ldo",
33 .id = 0,
34 .pm_runtime_no_callbacks = true,
35 },
36 {
37 .name = "wm8994-ldo",
38 .id = 1,
39 .pm_runtime_no_callbacks = true,
40 },
41 };
42
43 static const struct resource wm8994_codec_resources[] = {
44 {
45 .start = WM8994_IRQ_TEMP_SHUT,
46 .end = WM8994_IRQ_TEMP_WARN,
47 .flags = IORESOURCE_IRQ,
48 },
49 };
50
51 static const struct resource wm8994_gpio_resources[] = {
52 {
53 .start = WM8994_IRQ_GPIO(1),
54 .end = WM8994_IRQ_GPIO(11),
55 .flags = IORESOURCE_IRQ,
56 },
57 };
58
59 static const struct mfd_cell wm8994_devs[] = {
60 {
61 .name = "wm8994-codec",
62 .num_resources = ARRAY_SIZE(wm8994_codec_resources),
63 .resources = wm8994_codec_resources,
64 },
65
66 {
67 .name = "wm8994-gpio",
68 .num_resources = ARRAY_SIZE(wm8994_gpio_resources),
69 .resources = wm8994_gpio_resources,
70 .pm_runtime_no_callbacks = true,
71 },
72 };
73
74 /*
75 * Supplies for the main bulk of CODEC; the LDO supplies are ignored
76 * and should be handled via the standard regulator API supply
77 * management.
78 */
79 static const char *wm1811_main_supplies[] = {
80 "DBVDD1",
81 "DBVDD2",
82 "DBVDD3",
83 "DCVDD",
84 "AVDD1",
85 "AVDD2",
86 "CPVDD",
87 "SPKVDD1",
88 "SPKVDD2",
89 };
90
91 static const char *wm8994_main_supplies[] = {
92 "DBVDD",
93 "DCVDD",
94 "AVDD1",
95 "AVDD2",
96 "CPVDD",
97 "SPKVDD1",
98 "SPKVDD2",
99 };
100
101 static const char *wm8958_main_supplies[] = {
102 "DBVDD1",
103 "DBVDD2",
104 "DBVDD3",
105 "DCVDD",
106 "AVDD1",
107 "AVDD2",
108 "CPVDD",
109 "SPKVDD1",
110 "SPKVDD2",
111 };
112
113 #ifdef CONFIG_PM
wm8994_suspend(struct device * dev)114 static int wm8994_suspend(struct device *dev)
115 {
116 struct wm8994 *wm8994 = dev_get_drvdata(dev);
117 int ret;
118
119 /* Don't actually go through with the suspend if the CODEC is
120 * still active for accessory detect. */
121 switch (wm8994->type) {
122 case WM8958:
123 case WM1811:
124 ret = wm8994_reg_read(wm8994, WM8958_MIC_DETECT_1);
125 if (ret < 0) {
126 dev_err(dev, "Failed to read power status: %d\n", ret);
127 } else if (ret & WM8958_MICD_ENA) {
128 dev_dbg(dev, "CODEC still active, ignoring suspend\n");
129 return 0;
130 }
131 break;
132 default:
133 break;
134 }
135
136 /* Disable LDO pulldowns while the device is suspended if we
137 * don't know that something will be driving them. */
138 if (!wm8994->ldo_ena_always_driven)
139 wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
140 WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD,
141 WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD);
142
143 /* Explicitly put the device into reset in case regulators
144 * don't get disabled in order to ensure consistent restart.
145 */
146 wm8994_reg_write(wm8994, WM8994_SOFTWARE_RESET,
147 wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET));
148
149 regcache_mark_dirty(wm8994->regmap);
150
151 /* Restore GPIO registers to prevent problems with mismatched
152 * pin configurations.
153 */
154 ret = regcache_sync_region(wm8994->regmap, WM8994_GPIO_1,
155 WM8994_GPIO_11);
156 if (ret != 0)
157 dev_err(dev, "Failed to restore GPIO registers: %d\n", ret);
158
159 /* In case one of the GPIOs is used as a wake input. */
160 ret = regcache_sync_region(wm8994->regmap,
161 WM8994_INTERRUPT_STATUS_1_MASK,
162 WM8994_INTERRUPT_STATUS_1_MASK);
163 if (ret != 0)
164 dev_err(dev, "Failed to restore interrupt mask: %d\n", ret);
165
166 regcache_cache_only(wm8994->regmap, true);
167 wm8994->suspended = true;
168
169 ret = regulator_bulk_disable(wm8994->num_supplies,
170 wm8994->supplies);
171 if (ret != 0) {
172 dev_err(dev, "Failed to disable supplies: %d\n", ret);
173 return ret;
174 }
175
176 return 0;
177 }
178
wm8994_resume(struct device * dev)179 static int wm8994_resume(struct device *dev)
180 {
181 struct wm8994 *wm8994 = dev_get_drvdata(dev);
182 int ret;
183
184 /* We may have lied to the PM core about suspending */
185 if (!wm8994->suspended)
186 return 0;
187
188 ret = regulator_bulk_enable(wm8994->num_supplies,
189 wm8994->supplies);
190 if (ret != 0) {
191 dev_err(dev, "Failed to enable supplies: %d\n", ret);
192 return ret;
193 }
194
195 regcache_cache_only(wm8994->regmap, false);
196 ret = regcache_sync(wm8994->regmap);
197 if (ret != 0) {
198 dev_err(dev, "Failed to restore register map: %d\n", ret);
199 goto err_enable;
200 }
201
202 /* Disable LDO pulldowns while the device is active */
203 wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
204 WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD,
205 0);
206
207 wm8994->suspended = false;
208
209 return 0;
210
211 err_enable:
212 regulator_bulk_disable(wm8994->num_supplies, wm8994->supplies);
213
214 return ret;
215 }
216 #endif
217
218 #ifdef CONFIG_REGULATOR
wm8994_ldo_in_use(struct wm8994_pdata * pdata,int ldo)219 static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo)
220 {
221 struct wm8994_ldo_pdata *ldo_pdata;
222
223 if (!pdata)
224 return 0;
225
226 ldo_pdata = &pdata->ldo[ldo];
227
228 if (!ldo_pdata->init_data)
229 return 0;
230
231 return ldo_pdata->init_data->num_consumer_supplies != 0;
232 }
233 #else
wm8994_ldo_in_use(struct wm8994_pdata * pdata,int ldo)234 static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo)
235 {
236 return 0;
237 }
238 #endif
239
240 static const struct reg_sequence wm8994_revc_patch[] = {
241 { 0x102, 0x3 },
242 { 0x56, 0x3 },
243 { 0x817, 0x0 },
244 { 0x102, 0x0 },
245 };
246
247 static const struct reg_sequence wm8958_reva_patch[] = {
248 { 0x102, 0x3 },
249 { 0xcb, 0x81 },
250 { 0x817, 0x0 },
251 { 0x102, 0x0 },
252 };
253
254 static const struct reg_sequence wm1811_reva_patch[] = {
255 { 0x102, 0x3 },
256 { 0x56, 0xc07 },
257 { 0x5d, 0x7e },
258 { 0x5e, 0x0 },
259 { 0x102, 0x0 },
260 };
261
262 #ifdef CONFIG_OF
wm8994_set_pdata_from_of(struct wm8994 * wm8994)263 static int wm8994_set_pdata_from_of(struct wm8994 *wm8994)
264 {
265 struct device_node *np = wm8994->dev->of_node;
266 struct wm8994_pdata *pdata = &wm8994->pdata;
267 int i;
268
269 if (!np)
270 return 0;
271
272 if (of_property_read_u32_array(np, "wlf,gpio-cfg", pdata->gpio_defaults,
273 ARRAY_SIZE(pdata->gpio_defaults)) >= 0) {
274 for (i = 0; i < ARRAY_SIZE(pdata->gpio_defaults); i++) {
275 if (wm8994->pdata.gpio_defaults[i] == 0)
276 pdata->gpio_defaults[i]
277 = WM8994_CONFIGURE_GPIO;
278 }
279 }
280
281 of_property_read_u32_array(np, "wlf,micbias-cfg", pdata->micbias,
282 ARRAY_SIZE(pdata->micbias));
283
284 pdata->lineout1_diff = true;
285 pdata->lineout2_diff = true;
286 if (of_find_property(np, "wlf,lineout1-se", NULL))
287 pdata->lineout1_diff = false;
288 if (of_find_property(np, "wlf,lineout2-se", NULL))
289 pdata->lineout2_diff = false;
290
291 if (of_find_property(np, "wlf,lineout1-feedback", NULL))
292 pdata->lineout1fb = true;
293 if (of_find_property(np, "wlf,lineout2-feedback", NULL))
294 pdata->lineout2fb = true;
295
296 if (of_find_property(np, "wlf,ldoena-always-driven", NULL))
297 pdata->lineout2fb = true;
298
299 pdata->spkmode_pu = of_property_read_bool(np, "wlf,spkmode-pu");
300
301 pdata->csnaddr_pd = of_property_read_bool(np, "wlf,csnaddr-pd");
302
303 return 0;
304 }
305 #else
wm8994_set_pdata_from_of(struct wm8994 * wm8994)306 static int wm8994_set_pdata_from_of(struct wm8994 *wm8994)
307 {
308 return 0;
309 }
310 #endif
311
312 /*
313 * Instantiate the generic non-control parts of the device.
314 */
wm8994_device_init(struct wm8994 * wm8994,int irq)315 static int wm8994_device_init(struct wm8994 *wm8994, int irq)
316 {
317 struct wm8994_pdata *pdata;
318 struct regmap_config *regmap_config;
319 const struct reg_sequence *regmap_patch = NULL;
320 const char *devname;
321 int ret, i, patch_regs = 0;
322 int pulls = 0;
323
324 if (dev_get_platdata(wm8994->dev)) {
325 pdata = dev_get_platdata(wm8994->dev);
326 wm8994->pdata = *pdata;
327 }
328 pdata = &wm8994->pdata;
329
330 ret = wm8994_set_pdata_from_of(wm8994);
331 if (ret != 0)
332 return ret;
333
334 dev_set_drvdata(wm8994->dev, wm8994);
335
336 /* Add the on-chip regulators first for bootstrapping */
337 ret = mfd_add_devices(wm8994->dev, 0,
338 wm8994_regulator_devs,
339 ARRAY_SIZE(wm8994_regulator_devs),
340 NULL, 0, NULL);
341 if (ret != 0) {
342 dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
343 goto err;
344 }
345
346 switch (wm8994->type) {
347 case WM1811:
348 wm8994->num_supplies = ARRAY_SIZE(wm1811_main_supplies);
349 break;
350 case WM8994:
351 wm8994->num_supplies = ARRAY_SIZE(wm8994_main_supplies);
352 break;
353 case WM8958:
354 wm8994->num_supplies = ARRAY_SIZE(wm8958_main_supplies);
355 break;
356 default:
357 BUG();
358 goto err;
359 }
360
361 wm8994->supplies = devm_kcalloc(wm8994->dev,
362 wm8994->num_supplies,
363 sizeof(struct regulator_bulk_data),
364 GFP_KERNEL);
365 if (!wm8994->supplies) {
366 ret = -ENOMEM;
367 goto err;
368 }
369
370 switch (wm8994->type) {
371 case WM1811:
372 for (i = 0; i < ARRAY_SIZE(wm1811_main_supplies); i++)
373 wm8994->supplies[i].supply = wm1811_main_supplies[i];
374 break;
375 case WM8994:
376 for (i = 0; i < ARRAY_SIZE(wm8994_main_supplies); i++)
377 wm8994->supplies[i].supply = wm8994_main_supplies[i];
378 break;
379 case WM8958:
380 for (i = 0; i < ARRAY_SIZE(wm8958_main_supplies); i++)
381 wm8994->supplies[i].supply = wm8958_main_supplies[i];
382 break;
383 default:
384 BUG();
385 goto err;
386 }
387
388 /*
389 * Can't use devres helper here as some of the supplies are provided by
390 * wm8994->dev's children (regulators) and those regulators are
391 * unregistered by the devres core before the supplies are freed.
392 */
393 ret = regulator_bulk_get(wm8994->dev, wm8994->num_supplies,
394 wm8994->supplies);
395 if (ret != 0) {
396 if (ret != -EPROBE_DEFER)
397 dev_err(wm8994->dev, "Failed to get supplies: %d\n",
398 ret);
399 goto err;
400 }
401
402 ret = regulator_bulk_enable(wm8994->num_supplies, wm8994->supplies);
403 if (ret != 0) {
404 dev_err(wm8994->dev, "Failed to enable supplies: %d\n", ret);
405 goto err_regulator_free;
406 }
407
408 ret = wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET);
409 if (ret < 0) {
410 dev_err(wm8994->dev, "Failed to read ID register\n");
411 goto err_enable;
412 }
413 switch (ret) {
414 case 0x1811:
415 devname = "WM1811";
416 if (wm8994->type != WM1811)
417 dev_warn(wm8994->dev, "Device registered as type %d\n",
418 wm8994->type);
419 wm8994->type = WM1811;
420 break;
421 case 0x8994:
422 devname = "WM8994";
423 if (wm8994->type != WM8994)
424 dev_warn(wm8994->dev, "Device registered as type %d\n",
425 wm8994->type);
426 wm8994->type = WM8994;
427 break;
428 case 0x8958:
429 devname = "WM8958";
430 if (wm8994->type != WM8958)
431 dev_warn(wm8994->dev, "Device registered as type %d\n",
432 wm8994->type);
433 wm8994->type = WM8958;
434 break;
435 default:
436 dev_err(wm8994->dev, "Device is not a WM8994, ID is %x\n",
437 ret);
438 ret = -EINVAL;
439 goto err_enable;
440 }
441
442 ret = wm8994_reg_read(wm8994, WM8994_CHIP_REVISION);
443 if (ret < 0) {
444 dev_err(wm8994->dev, "Failed to read revision register: %d\n",
445 ret);
446 goto err_enable;
447 }
448 wm8994->revision = ret & WM8994_CHIP_REV_MASK;
449 wm8994->cust_id = (ret & WM8994_CUST_ID_MASK) >> WM8994_CUST_ID_SHIFT;
450
451 switch (wm8994->type) {
452 case WM8994:
453 switch (wm8994->revision) {
454 case 0:
455 case 1:
456 dev_warn(wm8994->dev,
457 "revision %c not fully supported\n",
458 'A' + wm8994->revision);
459 break;
460 case 2:
461 case 3:
462 default:
463 regmap_patch = wm8994_revc_patch;
464 patch_regs = ARRAY_SIZE(wm8994_revc_patch);
465 break;
466 }
467 break;
468
469 case WM8958:
470 switch (wm8994->revision) {
471 case 0:
472 regmap_patch = wm8958_reva_patch;
473 patch_regs = ARRAY_SIZE(wm8958_reva_patch);
474 break;
475 default:
476 break;
477 }
478 break;
479
480 case WM1811:
481 /* Revision C did not change the relevant layer */
482 if (wm8994->revision > 1)
483 wm8994->revision++;
484
485 regmap_patch = wm1811_reva_patch;
486 patch_regs = ARRAY_SIZE(wm1811_reva_patch);
487 break;
488
489 default:
490 break;
491 }
492
493 dev_info(wm8994->dev, "%s revision %c CUST_ID %02x\n", devname,
494 'A' + wm8994->revision, wm8994->cust_id);
495
496 switch (wm8994->type) {
497 case WM1811:
498 regmap_config = &wm1811_regmap_config;
499 break;
500 case WM8994:
501 regmap_config = &wm8994_regmap_config;
502 break;
503 case WM8958:
504 regmap_config = &wm8958_regmap_config;
505 break;
506 default:
507 dev_err(wm8994->dev, "Unknown device type %d\n", wm8994->type);
508 ret = -EINVAL;
509 goto err_enable;
510 }
511
512 ret = regmap_reinit_cache(wm8994->regmap, regmap_config);
513 if (ret != 0) {
514 dev_err(wm8994->dev, "Failed to reinit register cache: %d\n",
515 ret);
516 goto err_enable;
517 }
518
519 /* Explicitly put the device into reset in case regulators
520 * don't get disabled in order to ensure we know the device
521 * state.
522 */
523 ret = wm8994_reg_write(wm8994, WM8994_SOFTWARE_RESET,
524 wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET));
525 if (ret != 0) {
526 dev_err(wm8994->dev, "Failed to reset device: %d\n", ret);
527 goto err_enable;
528 }
529
530 if (regmap_patch) {
531 ret = regmap_register_patch(wm8994->regmap, regmap_patch,
532 patch_regs);
533 if (ret != 0) {
534 dev_err(wm8994->dev, "Failed to register patch: %d\n",
535 ret);
536 goto err_enable;
537 }
538 }
539
540 wm8994->irq_base = pdata->irq_base;
541 wm8994->gpio_base = pdata->gpio_base;
542
543 /* GPIO configuration is only applied if it's non-zero */
544 for (i = 0; i < ARRAY_SIZE(pdata->gpio_defaults); i++) {
545 if (pdata->gpio_defaults[i]) {
546 wm8994_set_bits(wm8994, WM8994_GPIO_1 + i,
547 0xffff, pdata->gpio_defaults[i]);
548 }
549 }
550
551 wm8994->ldo_ena_always_driven = pdata->ldo_ena_always_driven;
552
553 if (pdata->spkmode_pu)
554 pulls |= WM8994_SPKMODE_PU;
555 if (pdata->csnaddr_pd)
556 pulls |= WM8994_CSNADDR_PD;
557
558 /* Disable unneeded pulls */
559 wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
560 WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD |
561 WM8994_SPKMODE_PU | WM8994_CSNADDR_PD,
562 pulls);
563
564 /* In some system designs where the regulators are not in use,
565 * we can achieve a small reduction in leakage currents by
566 * floating LDO outputs. This bit makes no difference if the
567 * LDOs are enabled, it only affects cases where the LDOs were
568 * in operation and are then disabled.
569 */
570 for (i = 0; i < WM8994_NUM_LDO_REGS; i++) {
571 if (wm8994_ldo_in_use(pdata, i))
572 wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
573 WM8994_LDO1_DISCH, WM8994_LDO1_DISCH);
574 else
575 wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
576 WM8994_LDO1_DISCH, 0);
577 }
578
579 wm8994_irq_init(wm8994);
580
581 ret = mfd_add_devices(wm8994->dev, -1,
582 wm8994_devs, ARRAY_SIZE(wm8994_devs),
583 NULL, 0, NULL);
584 if (ret != 0) {
585 dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
586 goto err_irq;
587 }
588
589 pm_runtime_set_active(wm8994->dev);
590 pm_runtime_enable(wm8994->dev);
591 pm_runtime_idle(wm8994->dev);
592
593 return 0;
594
595 err_irq:
596 wm8994_irq_exit(wm8994);
597 err_enable:
598 regulator_bulk_disable(wm8994->num_supplies,
599 wm8994->supplies);
600 err_regulator_free:
601 regulator_bulk_free(wm8994->num_supplies, wm8994->supplies);
602 err:
603 mfd_remove_devices(wm8994->dev);
604 return ret;
605 }
606
wm8994_device_exit(struct wm8994 * wm8994)607 static void wm8994_device_exit(struct wm8994 *wm8994)
608 {
609 pm_runtime_get_sync(wm8994->dev);
610 pm_runtime_disable(wm8994->dev);
611 pm_runtime_put_noidle(wm8994->dev);
612 wm8994_irq_exit(wm8994);
613 regulator_bulk_disable(wm8994->num_supplies, wm8994->supplies);
614 regulator_bulk_free(wm8994->num_supplies, wm8994->supplies);
615 mfd_remove_devices(wm8994->dev);
616 }
617
618 static const struct of_device_id wm8994_of_match[] = {
619 { .compatible = "wlf,wm1811", .data = (void *)WM1811 },
620 { .compatible = "wlf,wm8994", .data = (void *)WM8994 },
621 { .compatible = "wlf,wm8958", .data = (void *)WM8958 },
622 { }
623 };
624 MODULE_DEVICE_TABLE(of, wm8994_of_match);
625
wm8994_i2c_probe(struct i2c_client * i2c,const struct i2c_device_id * id)626 static int wm8994_i2c_probe(struct i2c_client *i2c,
627 const struct i2c_device_id *id)
628 {
629 const struct of_device_id *of_id;
630 struct wm8994 *wm8994;
631 int ret;
632
633 wm8994 = devm_kzalloc(&i2c->dev, sizeof(struct wm8994), GFP_KERNEL);
634 if (wm8994 == NULL)
635 return -ENOMEM;
636
637 i2c_set_clientdata(i2c, wm8994);
638 wm8994->dev = &i2c->dev;
639 wm8994->irq = i2c->irq;
640
641 if (i2c->dev.of_node) {
642 of_id = of_match_device(wm8994_of_match, &i2c->dev);
643 if (of_id)
644 wm8994->type = (enum wm8994_type)of_id->data;
645 } else {
646 wm8994->type = id->driver_data;
647 }
648
649 wm8994->regmap = devm_regmap_init_i2c(i2c, &wm8994_base_regmap_config);
650 if (IS_ERR(wm8994->regmap)) {
651 ret = PTR_ERR(wm8994->regmap);
652 dev_err(wm8994->dev, "Failed to allocate register map: %d\n",
653 ret);
654 return ret;
655 }
656
657 return wm8994_device_init(wm8994, i2c->irq);
658 }
659
wm8994_i2c_remove(struct i2c_client * i2c)660 static int wm8994_i2c_remove(struct i2c_client *i2c)
661 {
662 struct wm8994 *wm8994 = i2c_get_clientdata(i2c);
663
664 wm8994_device_exit(wm8994);
665
666 return 0;
667 }
668
669 static const struct i2c_device_id wm8994_i2c_id[] = {
670 { "wm1811", WM1811 },
671 { "wm1811a", WM1811 },
672 { "wm8994", WM8994 },
673 { "wm8958", WM8958 },
674 { }
675 };
676 MODULE_DEVICE_TABLE(i2c, wm8994_i2c_id);
677
678 static const struct dev_pm_ops wm8994_pm_ops = {
679 SET_RUNTIME_PM_OPS(wm8994_suspend, wm8994_resume, NULL)
680 };
681
682 static struct i2c_driver wm8994_i2c_driver = {
683 .driver = {
684 .name = "wm8994",
685 .pm = &wm8994_pm_ops,
686 .of_match_table = wm8994_of_match,
687 },
688 .probe = wm8994_i2c_probe,
689 .remove = wm8994_i2c_remove,
690 .id_table = wm8994_i2c_id,
691 };
692
693 module_i2c_driver(wm8994_i2c_driver);
694
695 MODULE_DESCRIPTION("Core support for the WM8994 audio CODEC");
696 MODULE_LICENSE("GPL");
697 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
698 MODULE_SOFTDEP("pre: wm8994_regulator");
699