Merge branch 'drm-fixes-4.19' of git://people.freedesktop.org/~agd5f/linux into drm...
[linux-2.6-microblaze.git] / drivers / regulator / wm831x-ldo.c
1 /*
2  * wm831x-ldo.c  --  LDO driver for the WM831x series
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 #include <linux/module.h>
15 #include <linux/moduleparam.h>
16 #include <linux/init.h>
17 #include <linux/bitops.h>
18 #include <linux/err.h>
19 #include <linux/i2c.h>
20 #include <linux/platform_device.h>
21 #include <linux/regulator/driver.h>
22 #include <linux/slab.h>
23
24 #include <linux/mfd/wm831x/core.h>
25 #include <linux/mfd/wm831x/regulator.h>
26 #include <linux/mfd/wm831x/pdata.h>
27
28 #define WM831X_LDO_MAX_NAME 9
29
30 #define WM831X_LDO_CONTROL       0
31 #define WM831X_LDO_ON_CONTROL    1
32 #define WM831X_LDO_SLEEP_CONTROL 2
33
34 #define WM831X_ALIVE_LDO_ON_CONTROL    0
35 #define WM831X_ALIVE_LDO_SLEEP_CONTROL 1
36
37 struct wm831x_ldo {
38         char name[WM831X_LDO_MAX_NAME];
39         char supply_name[WM831X_LDO_MAX_NAME];
40         struct regulator_desc desc;
41         int base;
42         struct wm831x *wm831x;
43         struct regulator_dev *regulator;
44 };
45
46 /*
47  * Shared
48  */
49
50 static irqreturn_t wm831x_ldo_uv_irq(int irq, void *data)
51 {
52         struct wm831x_ldo *ldo = data;
53
54         regulator_notifier_call_chain(ldo->regulator,
55                                       REGULATOR_EVENT_UNDER_VOLTAGE,
56                                       NULL);
57
58         return IRQ_HANDLED;
59 }
60
61 /*
62  * General purpose LDOs
63  */
64
65 static const struct regulator_linear_range wm831x_gp_ldo_ranges[] = {
66         REGULATOR_LINEAR_RANGE(900000, 0, 14, 50000),
67         REGULATOR_LINEAR_RANGE(1700000, 15, 31, 100000),
68 };
69
70 static int wm831x_gp_ldo_set_suspend_voltage(struct regulator_dev *rdev,
71                                              int uV)
72 {
73         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
74         struct wm831x *wm831x = ldo->wm831x;
75         int sel, reg = ldo->base + WM831X_LDO_SLEEP_CONTROL;
76
77         sel = regulator_map_voltage_linear_range(rdev, uV, uV);
78         if (sel < 0)
79                 return sel;
80
81         return wm831x_set_bits(wm831x, reg, WM831X_LDO1_ON_VSEL_MASK, sel);
82 }
83
84 static unsigned int wm831x_gp_ldo_get_mode(struct regulator_dev *rdev)
85 {
86         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
87         struct wm831x *wm831x = ldo->wm831x;
88         int ctrl_reg = ldo->base + WM831X_LDO_CONTROL;
89         int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
90         int ret;
91
92         ret = wm831x_reg_read(wm831x, on_reg);
93         if (ret < 0)
94                 return ret;
95
96         if (!(ret & WM831X_LDO1_ON_MODE))
97                 return REGULATOR_MODE_NORMAL;
98
99         ret = wm831x_reg_read(wm831x, ctrl_reg);
100         if (ret < 0)
101                 return ret;
102
103         if (ret & WM831X_LDO1_LP_MODE)
104                 return REGULATOR_MODE_STANDBY;
105         else
106                 return REGULATOR_MODE_IDLE;
107 }
108
109 static int wm831x_gp_ldo_set_mode(struct regulator_dev *rdev,
110                                   unsigned int mode)
111 {
112         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
113         struct wm831x *wm831x = ldo->wm831x;
114         int ctrl_reg = ldo->base + WM831X_LDO_CONTROL;
115         int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
116         int ret;
117
118
119         switch (mode) {
120         case REGULATOR_MODE_NORMAL:
121                 ret = wm831x_set_bits(wm831x, on_reg,
122                                       WM831X_LDO1_ON_MODE, 0);
123                 if (ret < 0)
124                         return ret;
125                 break;
126
127         case REGULATOR_MODE_IDLE:
128                 ret = wm831x_set_bits(wm831x, ctrl_reg,
129                                       WM831X_LDO1_LP_MODE, 0);
130                 if (ret < 0)
131                         return ret;
132
133                 ret = wm831x_set_bits(wm831x, on_reg,
134                                       WM831X_LDO1_ON_MODE,
135                                       WM831X_LDO1_ON_MODE);
136                 if (ret < 0)
137                         return ret;
138                 break;
139
140         case REGULATOR_MODE_STANDBY:
141                 ret = wm831x_set_bits(wm831x, ctrl_reg,
142                                       WM831X_LDO1_LP_MODE,
143                                       WM831X_LDO1_LP_MODE);
144                 if (ret < 0)
145                         return ret;
146
147                 ret = wm831x_set_bits(wm831x, on_reg,
148                                       WM831X_LDO1_ON_MODE,
149                                       WM831X_LDO1_ON_MODE);
150                 if (ret < 0)
151                         return ret;
152                 break;
153
154         default:
155                 return -EINVAL;
156         }
157
158         return 0;
159 }
160
161 static int wm831x_gp_ldo_get_status(struct regulator_dev *rdev)
162 {
163         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
164         struct wm831x *wm831x = ldo->wm831x;
165         int mask = 1 << rdev_get_id(rdev);
166         int ret;
167
168         /* Is the regulator on? */
169         ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS);
170         if (ret < 0)
171                 return ret;
172         if (!(ret & mask))
173                 return REGULATOR_STATUS_OFF;
174
175         /* Is it reporting under voltage? */
176         ret = wm831x_reg_read(wm831x, WM831X_LDO_UV_STATUS);
177         if (ret < 0)
178                 return ret;
179         if (ret & mask)
180                 return REGULATOR_STATUS_ERROR;
181
182         ret = wm831x_gp_ldo_get_mode(rdev);
183         if (ret < 0)
184                 return ret;
185         else
186                 return regulator_mode_to_status(ret);
187 }
188
189 static unsigned int wm831x_gp_ldo_get_optimum_mode(struct regulator_dev *rdev,
190                                                    int input_uV,
191                                                    int output_uV, int load_uA)
192 {
193         if (load_uA < 20000)
194                 return REGULATOR_MODE_STANDBY;
195         if (load_uA < 50000)
196                 return REGULATOR_MODE_IDLE;
197         return REGULATOR_MODE_NORMAL;
198 }
199
200
201 static const struct regulator_ops wm831x_gp_ldo_ops = {
202         .list_voltage = regulator_list_voltage_linear_range,
203         .map_voltage = regulator_map_voltage_linear_range,
204         .get_voltage_sel = regulator_get_voltage_sel_regmap,
205         .set_voltage_sel = regulator_set_voltage_sel_regmap,
206         .set_suspend_voltage = wm831x_gp_ldo_set_suspend_voltage,
207         .get_mode = wm831x_gp_ldo_get_mode,
208         .set_mode = wm831x_gp_ldo_set_mode,
209         .get_status = wm831x_gp_ldo_get_status,
210         .get_optimum_mode = wm831x_gp_ldo_get_optimum_mode,
211         .get_bypass = regulator_get_bypass_regmap,
212         .set_bypass = regulator_set_bypass_regmap,
213
214         .is_enabled = regulator_is_enabled_regmap,
215         .enable = regulator_enable_regmap,
216         .disable = regulator_disable_regmap,
217 };
218
219 static int wm831x_gp_ldo_probe(struct platform_device *pdev)
220 {
221         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
222         struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
223         struct regulator_config config = { };
224         int id;
225         struct wm831x_ldo *ldo;
226         struct resource *res;
227         int ret, irq;
228
229         if (pdata && pdata->wm831x_num)
230                 id = (pdata->wm831x_num * 10) + 1;
231         else
232                 id = 0;
233         id = pdev->id - id;
234
235         dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
236
237         ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL);
238         if (!ldo)
239                 return -ENOMEM;
240
241         ldo->wm831x = wm831x;
242
243         res = platform_get_resource(pdev, IORESOURCE_REG, 0);
244         if (res == NULL) {
245                 dev_err(&pdev->dev, "No REG resource\n");
246                 ret = -EINVAL;
247                 goto err;
248         }
249         ldo->base = res->start;
250
251         snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
252         ldo->desc.name = ldo->name;
253
254         snprintf(ldo->supply_name, sizeof(ldo->supply_name),
255                  "LDO%dVDD", id + 1);
256         ldo->desc.supply_name = ldo->supply_name;
257
258         ldo->desc.id = id;
259         ldo->desc.type = REGULATOR_VOLTAGE;
260         ldo->desc.n_voltages = 32;
261         ldo->desc.ops = &wm831x_gp_ldo_ops;
262         ldo->desc.owner = THIS_MODULE;
263         ldo->desc.vsel_reg = ldo->base + WM831X_LDO_ON_CONTROL;
264         ldo->desc.vsel_mask = WM831X_LDO1_ON_VSEL_MASK;
265         ldo->desc.enable_reg = WM831X_LDO_ENABLE;
266         ldo->desc.enable_mask = 1 << id;
267         ldo->desc.bypass_reg = ldo->base;
268         ldo->desc.bypass_mask = WM831X_LDO1_SWI;
269         ldo->desc.linear_ranges = wm831x_gp_ldo_ranges;
270         ldo->desc.n_linear_ranges = ARRAY_SIZE(wm831x_gp_ldo_ranges);
271
272         config.dev = pdev->dev.parent;
273         if (pdata)
274                 config.init_data = pdata->ldo[id];
275         config.driver_data = ldo;
276         config.regmap = wm831x->regmap;
277
278         ldo->regulator = devm_regulator_register(&pdev->dev, &ldo->desc,
279                                                  &config);
280         if (IS_ERR(ldo->regulator)) {
281                 ret = PTR_ERR(ldo->regulator);
282                 dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
283                         id + 1, ret);
284                 goto err;
285         }
286
287         irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
288         ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
289                                         wm831x_ldo_uv_irq,
290                                         IRQF_TRIGGER_RISING | IRQF_ONESHOT,
291                                         ldo->name,
292                                         ldo);
293         if (ret != 0) {
294                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
295                         irq, ret);
296                 goto err;
297         }
298
299         platform_set_drvdata(pdev, ldo);
300
301         return 0;
302
303 err:
304         return ret;
305 }
306
307 static struct platform_driver wm831x_gp_ldo_driver = {
308         .probe = wm831x_gp_ldo_probe,
309         .driver         = {
310                 .name   = "wm831x-ldo",
311         },
312 };
313
314 /*
315  * Analogue LDOs
316  */
317
318 static const struct regulator_linear_range wm831x_aldo_ranges[] = {
319         REGULATOR_LINEAR_RANGE(1000000, 0, 12, 50000),
320         REGULATOR_LINEAR_RANGE(1700000, 13, 31, 100000),
321 };
322
323 static int wm831x_aldo_set_suspend_voltage(struct regulator_dev *rdev,
324                                              int uV)
325 {
326         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
327         struct wm831x *wm831x = ldo->wm831x;
328         int sel, reg = ldo->base + WM831X_LDO_SLEEP_CONTROL;
329
330         sel = regulator_map_voltage_linear_range(rdev, uV, uV);
331         if (sel < 0)
332                 return sel;
333
334         return wm831x_set_bits(wm831x, reg, WM831X_LDO7_ON_VSEL_MASK, sel);
335 }
336
337 static unsigned int wm831x_aldo_get_mode(struct regulator_dev *rdev)
338 {
339         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
340         struct wm831x *wm831x = ldo->wm831x;
341         int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
342         int ret;
343
344         ret = wm831x_reg_read(wm831x, on_reg);
345         if (ret < 0)
346                 return 0;
347
348         if (ret & WM831X_LDO7_ON_MODE)
349                 return REGULATOR_MODE_IDLE;
350         else
351                 return REGULATOR_MODE_NORMAL;
352 }
353
354 static int wm831x_aldo_set_mode(struct regulator_dev *rdev,
355                                   unsigned int mode)
356 {
357         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
358         struct wm831x *wm831x = ldo->wm831x;
359         int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
360         int ret;
361
362
363         switch (mode) {
364         case REGULATOR_MODE_NORMAL:
365                 ret = wm831x_set_bits(wm831x, on_reg, WM831X_LDO7_ON_MODE, 0);
366                 if (ret < 0)
367                         return ret;
368                 break;
369
370         case REGULATOR_MODE_IDLE:
371                 ret = wm831x_set_bits(wm831x, on_reg, WM831X_LDO7_ON_MODE,
372                                       WM831X_LDO7_ON_MODE);
373                 if (ret < 0)
374                         return ret;
375                 break;
376
377         default:
378                 return -EINVAL;
379         }
380
381         return 0;
382 }
383
384 static int wm831x_aldo_get_status(struct regulator_dev *rdev)
385 {
386         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
387         struct wm831x *wm831x = ldo->wm831x;
388         int mask = 1 << rdev_get_id(rdev);
389         int ret;
390
391         /* Is the regulator on? */
392         ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS);
393         if (ret < 0)
394                 return ret;
395         if (!(ret & mask))
396                 return REGULATOR_STATUS_OFF;
397
398         /* Is it reporting under voltage? */
399         ret = wm831x_reg_read(wm831x, WM831X_LDO_UV_STATUS);
400         if (ret < 0)
401                 return ret;
402         if (ret & mask)
403                 return REGULATOR_STATUS_ERROR;
404
405         ret = wm831x_aldo_get_mode(rdev);
406         if (ret < 0)
407                 return ret;
408         else
409                 return regulator_mode_to_status(ret);
410 }
411
412 static const struct regulator_ops wm831x_aldo_ops = {
413         .list_voltage = regulator_list_voltage_linear_range,
414         .map_voltage = regulator_map_voltage_linear_range,
415         .get_voltage_sel = regulator_get_voltage_sel_regmap,
416         .set_voltage_sel = regulator_set_voltage_sel_regmap,
417         .set_suspend_voltage = wm831x_aldo_set_suspend_voltage,
418         .get_mode = wm831x_aldo_get_mode,
419         .set_mode = wm831x_aldo_set_mode,
420         .get_status = wm831x_aldo_get_status,
421         .set_bypass = regulator_set_bypass_regmap,
422         .get_bypass = regulator_get_bypass_regmap,
423
424         .is_enabled = regulator_is_enabled_regmap,
425         .enable = regulator_enable_regmap,
426         .disable = regulator_disable_regmap,
427 };
428
429 static int wm831x_aldo_probe(struct platform_device *pdev)
430 {
431         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
432         struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
433         struct regulator_config config = { };
434         int id;
435         struct wm831x_ldo *ldo;
436         struct resource *res;
437         int ret, irq;
438
439         if (pdata && pdata->wm831x_num)
440                 id = (pdata->wm831x_num * 10) + 1;
441         else
442                 id = 0;
443         id = pdev->id - id;
444
445         dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
446
447         ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL);
448         if (!ldo)
449                 return -ENOMEM;
450
451         ldo->wm831x = wm831x;
452
453         res = platform_get_resource(pdev, IORESOURCE_REG, 0);
454         if (res == NULL) {
455                 dev_err(&pdev->dev, "No REG resource\n");
456                 ret = -EINVAL;
457                 goto err;
458         }
459         ldo->base = res->start;
460
461         snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
462         ldo->desc.name = ldo->name;
463
464         snprintf(ldo->supply_name, sizeof(ldo->supply_name),
465                  "LDO%dVDD", id + 1);
466         ldo->desc.supply_name = ldo->supply_name;
467
468         ldo->desc.id = id;
469         ldo->desc.type = REGULATOR_VOLTAGE;
470         ldo->desc.n_voltages = 32;
471         ldo->desc.linear_ranges = wm831x_aldo_ranges;
472         ldo->desc.n_linear_ranges = ARRAY_SIZE(wm831x_aldo_ranges);
473         ldo->desc.ops = &wm831x_aldo_ops;
474         ldo->desc.owner = THIS_MODULE;
475         ldo->desc.vsel_reg = ldo->base + WM831X_LDO_ON_CONTROL;
476         ldo->desc.vsel_mask = WM831X_LDO7_ON_VSEL_MASK;
477         ldo->desc.enable_reg = WM831X_LDO_ENABLE;
478         ldo->desc.enable_mask = 1 << id;
479         ldo->desc.bypass_reg = ldo->base;
480         ldo->desc.bypass_mask = WM831X_LDO7_SWI;
481
482         config.dev = pdev->dev.parent;
483         if (pdata)
484                 config.init_data = pdata->ldo[id];
485         config.driver_data = ldo;
486         config.regmap = wm831x->regmap;
487
488         ldo->regulator = devm_regulator_register(&pdev->dev, &ldo->desc,
489                                                  &config);
490         if (IS_ERR(ldo->regulator)) {
491                 ret = PTR_ERR(ldo->regulator);
492                 dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
493                         id + 1, ret);
494                 goto err;
495         }
496
497         irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
498         ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
499                                         wm831x_ldo_uv_irq,
500                                         IRQF_TRIGGER_RISING | IRQF_ONESHOT,
501                                         ldo->name, ldo);
502         if (ret != 0) {
503                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
504                         irq, ret);
505                 goto err;
506         }
507
508         platform_set_drvdata(pdev, ldo);
509
510         return 0;
511
512 err:
513         return ret;
514 }
515
516 static struct platform_driver wm831x_aldo_driver = {
517         .probe = wm831x_aldo_probe,
518         .driver         = {
519                 .name   = "wm831x-aldo",
520         },
521 };
522
523 /*
524  * Alive LDO
525  */
526
527 #define WM831X_ALIVE_LDO_MAX_SELECTOR 0xf
528
529 static int wm831x_alive_ldo_set_suspend_voltage(struct regulator_dev *rdev,
530                                              int uV)
531 {
532         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
533         struct wm831x *wm831x = ldo->wm831x;
534         int sel, reg = ldo->base + WM831X_ALIVE_LDO_SLEEP_CONTROL;
535
536         sel = regulator_map_voltage_linear(rdev, uV, uV);
537         if (sel < 0)
538                 return sel;
539
540         return wm831x_set_bits(wm831x, reg, WM831X_LDO11_ON_VSEL_MASK, sel);
541 }
542
543 static int wm831x_alive_ldo_get_status(struct regulator_dev *rdev)
544 {
545         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
546         struct wm831x *wm831x = ldo->wm831x;
547         int mask = 1 << rdev_get_id(rdev);
548         int ret;
549
550         /* Is the regulator on? */
551         ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS);
552         if (ret < 0)
553                 return ret;
554         if (ret & mask)
555                 return REGULATOR_STATUS_ON;
556         else
557                 return REGULATOR_STATUS_OFF;
558 }
559
560 static const struct regulator_ops wm831x_alive_ldo_ops = {
561         .list_voltage = regulator_list_voltage_linear,
562         .map_voltage = regulator_map_voltage_linear,
563         .get_voltage_sel = regulator_get_voltage_sel_regmap,
564         .set_voltage_sel = regulator_set_voltage_sel_regmap,
565         .set_suspend_voltage = wm831x_alive_ldo_set_suspend_voltage,
566         .get_status = wm831x_alive_ldo_get_status,
567
568         .is_enabled = regulator_is_enabled_regmap,
569         .enable = regulator_enable_regmap,
570         .disable = regulator_disable_regmap,
571 };
572
573 static int wm831x_alive_ldo_probe(struct platform_device *pdev)
574 {
575         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
576         struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
577         struct regulator_config config = { };
578         int id;
579         struct wm831x_ldo *ldo;
580         struct resource *res;
581         int ret;
582
583         if (pdata && pdata->wm831x_num)
584                 id = (pdata->wm831x_num * 10) + 1;
585         else
586                 id = 0;
587         id = pdev->id - id;
588
589
590         dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
591
592         ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL);
593         if (!ldo)
594                 return -ENOMEM;
595
596         ldo->wm831x = wm831x;
597
598         res = platform_get_resource(pdev, IORESOURCE_REG, 0);
599         if (res == NULL) {
600                 dev_err(&pdev->dev, "No REG resource\n");
601                 ret = -EINVAL;
602                 goto err;
603         }
604         ldo->base = res->start;
605
606         snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
607         ldo->desc.name = ldo->name;
608
609         snprintf(ldo->supply_name, sizeof(ldo->supply_name),
610                  "LDO%dVDD", id + 1);
611         ldo->desc.supply_name = ldo->supply_name;
612
613         ldo->desc.id = id;
614         ldo->desc.type = REGULATOR_VOLTAGE;
615         ldo->desc.n_voltages = WM831X_ALIVE_LDO_MAX_SELECTOR + 1;
616         ldo->desc.ops = &wm831x_alive_ldo_ops;
617         ldo->desc.owner = THIS_MODULE;
618         ldo->desc.vsel_reg = ldo->base + WM831X_ALIVE_LDO_ON_CONTROL;
619         ldo->desc.vsel_mask = WM831X_LDO11_ON_VSEL_MASK;
620         ldo->desc.enable_reg = WM831X_LDO_ENABLE;
621         ldo->desc.enable_mask = 1 << id;
622         ldo->desc.min_uV = 800000;
623         ldo->desc.uV_step = 50000;
624         ldo->desc.enable_time = 1000;
625
626         config.dev = pdev->dev.parent;
627         if (pdata)
628                 config.init_data = pdata->ldo[id];
629         config.driver_data = ldo;
630         config.regmap = wm831x->regmap;
631
632         ldo->regulator = devm_regulator_register(&pdev->dev, &ldo->desc,
633                                                  &config);
634         if (IS_ERR(ldo->regulator)) {
635                 ret = PTR_ERR(ldo->regulator);
636                 dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
637                         id + 1, ret);
638                 goto err;
639         }
640
641         platform_set_drvdata(pdev, ldo);
642
643         return 0;
644
645 err:
646         return ret;
647 }
648
649 static struct platform_driver wm831x_alive_ldo_driver = {
650         .probe = wm831x_alive_ldo_probe,
651         .driver         = {
652                 .name   = "wm831x-alive-ldo",
653         },
654 };
655
656 static struct platform_driver * const drivers[] = {
657         &wm831x_gp_ldo_driver,
658         &wm831x_aldo_driver,
659         &wm831x_alive_ldo_driver,
660 };
661
662 static int __init wm831x_ldo_init(void)
663 {
664         return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
665 }
666 subsys_initcall(wm831x_ldo_init);
667
668 static void __exit wm831x_ldo_exit(void)
669 {
670         platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
671 }
672 module_exit(wm831x_ldo_exit);
673
674 /* Module information */
675 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
676 MODULE_DESCRIPTION("WM831x LDO driver");
677 MODULE_LICENSE("GPL");
678 MODULE_ALIAS("platform:wm831x-ldo");
679 MODULE_ALIAS("platform:wm831x-aldo");
680 MODULE_ALIAS("platform:wm831x-aliveldo");