Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4
[~shefty/rdma-dev.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 6
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         struct regulator_desc desc;
40         int base;
41         struct wm831x *wm831x;
42         struct regulator_dev *regulator;
43 };
44
45 /*
46  * Shared
47  */
48
49 static int wm831x_ldo_is_enabled(struct regulator_dev *rdev)
50 {
51         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
52         struct wm831x *wm831x = ldo->wm831x;
53         int mask = 1 << rdev_get_id(rdev);
54         int reg;
55
56         reg = wm831x_reg_read(wm831x, WM831X_LDO_ENABLE);
57         if (reg < 0)
58                 return reg;
59
60         if (reg & mask)
61                 return 1;
62         else
63                 return 0;
64 }
65
66 static int wm831x_ldo_enable(struct regulator_dev *rdev)
67 {
68         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
69         struct wm831x *wm831x = ldo->wm831x;
70         int mask = 1 << rdev_get_id(rdev);
71
72         return wm831x_set_bits(wm831x, WM831X_LDO_ENABLE, mask, mask);
73 }
74
75 static int wm831x_ldo_disable(struct regulator_dev *rdev)
76 {
77         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
78         struct wm831x *wm831x = ldo->wm831x;
79         int mask = 1 << rdev_get_id(rdev);
80
81         return wm831x_set_bits(wm831x, WM831X_LDO_ENABLE, mask, 0);
82 }
83
84 static irqreturn_t wm831x_ldo_uv_irq(int irq, void *data)
85 {
86         struct wm831x_ldo *ldo = data;
87
88         regulator_notifier_call_chain(ldo->regulator,
89                                       REGULATOR_EVENT_UNDER_VOLTAGE,
90                                       NULL);
91
92         return IRQ_HANDLED;
93 }
94
95 /*
96  * General purpose LDOs
97  */
98
99 #define WM831X_GP_LDO_SELECTOR_LOW 0xe
100 #define WM831X_GP_LDO_MAX_SELECTOR 0x1f
101
102 static int wm831x_gp_ldo_list_voltage(struct regulator_dev *rdev,
103                                       unsigned int selector)
104 {
105         /* 0.9-1.6V in 50mV steps */
106         if (selector <= WM831X_GP_LDO_SELECTOR_LOW)
107                 return 900000 + (selector * 50000);
108         /* 1.7-3.3V in 50mV steps */
109         if (selector <= WM831X_GP_LDO_MAX_SELECTOR)
110                 return 1600000 + ((selector - WM831X_GP_LDO_SELECTOR_LOW)
111                                   * 100000);
112         return -EINVAL;
113 }
114
115 static int wm831x_gp_ldo_set_voltage_int(struct regulator_dev *rdev, int reg,
116                                          int min_uV, int max_uV,
117                                          unsigned *selector)
118 {
119         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
120         struct wm831x *wm831x = ldo->wm831x;
121         int vsel, ret;
122
123         if (min_uV < 900000)
124                 vsel = 0;
125         else if (min_uV < 1700000)
126                 vsel = ((min_uV - 900000) / 50000);
127         else
128                 vsel = ((min_uV - 1700000) / 100000)
129                         + WM831X_GP_LDO_SELECTOR_LOW + 1;
130
131         ret = wm831x_gp_ldo_list_voltage(rdev, vsel);
132         if (ret < 0)
133                 return ret;
134         if (ret < min_uV || ret > max_uV)
135                 return -EINVAL;
136
137         *selector = vsel;
138
139         return wm831x_set_bits(wm831x, reg, WM831X_LDO1_ON_VSEL_MASK, vsel);
140 }
141
142 static int wm831x_gp_ldo_set_voltage(struct regulator_dev *rdev,
143                                      int min_uV, int max_uV,
144                                      unsigned *selector)
145 {
146         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
147         int reg = ldo->base + WM831X_LDO_ON_CONTROL;
148
149         return wm831x_gp_ldo_set_voltage_int(rdev, reg, min_uV, max_uV,
150                                              selector);
151 }
152
153 static int wm831x_gp_ldo_set_suspend_voltage(struct regulator_dev *rdev,
154                                              int uV)
155 {
156         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
157         int reg = ldo->base + WM831X_LDO_SLEEP_CONTROL;
158         unsigned int selector;
159
160         return wm831x_gp_ldo_set_voltage_int(rdev, reg, uV, uV, &selector);
161 }
162
163 static int wm831x_gp_ldo_get_voltage_sel(struct regulator_dev *rdev)
164 {
165         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
166         struct wm831x *wm831x = ldo->wm831x;
167         int reg = ldo->base + WM831X_LDO_ON_CONTROL;
168         int ret;
169
170         ret = wm831x_reg_read(wm831x, reg);
171         if (ret < 0)
172                 return ret;
173
174         ret &= WM831X_LDO1_ON_VSEL_MASK;
175
176         return ret;
177 }
178
179 static unsigned int wm831x_gp_ldo_get_mode(struct regulator_dev *rdev)
180 {
181         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
182         struct wm831x *wm831x = ldo->wm831x;
183         int ctrl_reg = ldo->base + WM831X_LDO_CONTROL;
184         int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
185         int ret;
186
187         ret = wm831x_reg_read(wm831x, on_reg);
188         if (ret < 0)
189                 return ret;
190
191         if (!(ret & WM831X_LDO1_ON_MODE))
192                 return REGULATOR_MODE_NORMAL;
193
194         ret = wm831x_reg_read(wm831x, ctrl_reg);
195         if (ret < 0)
196                 return ret;
197
198         if (ret & WM831X_LDO1_LP_MODE)
199                 return REGULATOR_MODE_STANDBY;
200         else
201                 return REGULATOR_MODE_IDLE;
202 }
203
204 static int wm831x_gp_ldo_set_mode(struct regulator_dev *rdev,
205                                   unsigned int mode)
206 {
207         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
208         struct wm831x *wm831x = ldo->wm831x;
209         int ctrl_reg = ldo->base + WM831X_LDO_CONTROL;
210         int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
211         int ret;
212
213
214         switch (mode) {
215         case REGULATOR_MODE_NORMAL:
216                 ret = wm831x_set_bits(wm831x, on_reg,
217                                       WM831X_LDO1_ON_MODE, 0);
218                 if (ret < 0)
219                         return ret;
220                 break;
221
222         case REGULATOR_MODE_IDLE:
223                 ret = wm831x_set_bits(wm831x, ctrl_reg,
224                                       WM831X_LDO1_LP_MODE, 0);
225                 if (ret < 0)
226                         return ret;
227
228                 ret = wm831x_set_bits(wm831x, on_reg,
229                                       WM831X_LDO1_ON_MODE,
230                                       WM831X_LDO1_ON_MODE);
231                 if (ret < 0)
232                         return ret;
233                 break;
234
235         case REGULATOR_MODE_STANDBY:
236                 ret = wm831x_set_bits(wm831x, ctrl_reg,
237                                       WM831X_LDO1_LP_MODE,
238                                       WM831X_LDO1_LP_MODE);
239                 if (ret < 0)
240                         return ret;
241
242                 ret = wm831x_set_bits(wm831x, on_reg,
243                                       WM831X_LDO1_ON_MODE,
244                                       WM831X_LDO1_ON_MODE);
245                 if (ret < 0)
246                         return ret;
247                 break;
248
249         default:
250                 return -EINVAL;
251         }
252
253         return 0;
254 }
255
256 static int wm831x_gp_ldo_get_status(struct regulator_dev *rdev)
257 {
258         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
259         struct wm831x *wm831x = ldo->wm831x;
260         int mask = 1 << rdev_get_id(rdev);
261         int ret;
262
263         /* Is the regulator on? */
264         ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS);
265         if (ret < 0)
266                 return ret;
267         if (!(ret & mask))
268                 return REGULATOR_STATUS_OFF;
269
270         /* Is it reporting under voltage? */
271         ret = wm831x_reg_read(wm831x, WM831X_LDO_UV_STATUS);
272         if (ret & mask)
273                 return REGULATOR_STATUS_ERROR;
274
275         ret = wm831x_gp_ldo_get_mode(rdev);
276         if (ret < 0)
277                 return ret;
278         else
279                 return regulator_mode_to_status(ret);
280 }
281
282 static unsigned int wm831x_gp_ldo_get_optimum_mode(struct regulator_dev *rdev,
283                                                    int input_uV,
284                                                    int output_uV, int load_uA)
285 {
286         if (load_uA < 20000)
287                 return REGULATOR_MODE_STANDBY;
288         if (load_uA < 50000)
289                 return REGULATOR_MODE_IDLE;
290         return REGULATOR_MODE_NORMAL;
291 }
292
293
294 static struct regulator_ops wm831x_gp_ldo_ops = {
295         .list_voltage = wm831x_gp_ldo_list_voltage,
296         .get_voltage_sel = wm831x_gp_ldo_get_voltage_sel,
297         .set_voltage = wm831x_gp_ldo_set_voltage,
298         .set_suspend_voltage = wm831x_gp_ldo_set_suspend_voltage,
299         .get_mode = wm831x_gp_ldo_get_mode,
300         .set_mode = wm831x_gp_ldo_set_mode,
301         .get_status = wm831x_gp_ldo_get_status,
302         .get_optimum_mode = wm831x_gp_ldo_get_optimum_mode,
303
304         .is_enabled = wm831x_ldo_is_enabled,
305         .enable = wm831x_ldo_enable,
306         .disable = wm831x_ldo_disable,
307 };
308
309 static __devinit int wm831x_gp_ldo_probe(struct platform_device *pdev)
310 {
311         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
312         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
313         int id = pdev->id % ARRAY_SIZE(pdata->ldo);
314         struct wm831x_ldo *ldo;
315         struct resource *res;
316         int ret, irq;
317
318         dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
319
320         if (pdata == NULL || pdata->ldo[id] == NULL)
321                 return -ENODEV;
322
323         ldo = kzalloc(sizeof(struct wm831x_ldo), GFP_KERNEL);
324         if (ldo == NULL) {
325                 dev_err(&pdev->dev, "Unable to allocate private data\n");
326                 return -ENOMEM;
327         }
328
329         ldo->wm831x = wm831x;
330
331         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
332         if (res == NULL) {
333                 dev_err(&pdev->dev, "No I/O resource\n");
334                 ret = -EINVAL;
335                 goto err;
336         }
337         ldo->base = res->start;
338
339         snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
340         ldo->desc.name = ldo->name;
341         ldo->desc.id = id;
342         ldo->desc.type = REGULATOR_VOLTAGE;
343         ldo->desc.n_voltages = WM831X_GP_LDO_MAX_SELECTOR + 1;
344         ldo->desc.ops = &wm831x_gp_ldo_ops;
345         ldo->desc.owner = THIS_MODULE;
346
347         ldo->regulator = regulator_register(&ldo->desc, &pdev->dev,
348                                              pdata->ldo[id], ldo);
349         if (IS_ERR(ldo->regulator)) {
350                 ret = PTR_ERR(ldo->regulator);
351                 dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
352                         id + 1, ret);
353                 goto err;
354         }
355
356         irq = platform_get_irq_byname(pdev, "UV");
357         ret = request_threaded_irq(irq, NULL, wm831x_ldo_uv_irq,
358                                    IRQF_TRIGGER_RISING, ldo->name,
359                                    ldo);
360         if (ret != 0) {
361                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
362                         irq, ret);
363                 goto err_regulator;
364         }
365
366         platform_set_drvdata(pdev, ldo);
367
368         return 0;
369
370 err_regulator:
371         regulator_unregister(ldo->regulator);
372 err:
373         kfree(ldo);
374         return ret;
375 }
376
377 static __devexit int wm831x_gp_ldo_remove(struct platform_device *pdev)
378 {
379         struct wm831x_ldo *ldo = platform_get_drvdata(pdev);
380
381         platform_set_drvdata(pdev, NULL);
382
383         free_irq(platform_get_irq_byname(pdev, "UV"), ldo);
384         regulator_unregister(ldo->regulator);
385         kfree(ldo);
386
387         return 0;
388 }
389
390 static struct platform_driver wm831x_gp_ldo_driver = {
391         .probe = wm831x_gp_ldo_probe,
392         .remove = __devexit_p(wm831x_gp_ldo_remove),
393         .driver         = {
394                 .name   = "wm831x-ldo",
395                 .owner  = THIS_MODULE,
396         },
397 };
398
399 /*
400  * Analogue LDOs
401  */
402
403
404 #define WM831X_ALDO_SELECTOR_LOW 0xc
405 #define WM831X_ALDO_MAX_SELECTOR 0x1f
406
407 static int wm831x_aldo_list_voltage(struct regulator_dev *rdev,
408                                       unsigned int selector)
409 {
410         /* 1-1.6V in 50mV steps */
411         if (selector <= WM831X_ALDO_SELECTOR_LOW)
412                 return 1000000 + (selector * 50000);
413         /* 1.7-3.5V in 50mV steps */
414         if (selector <= WM831X_ALDO_MAX_SELECTOR)
415                 return 1600000 + ((selector - WM831X_ALDO_SELECTOR_LOW)
416                                   * 100000);
417         return -EINVAL;
418 }
419
420 static int wm831x_aldo_set_voltage_int(struct regulator_dev *rdev, int reg,
421                                        int min_uV, int max_uV,
422                                        unsigned *selector)
423 {
424         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
425         struct wm831x *wm831x = ldo->wm831x;
426         int vsel, ret;
427
428         if (min_uV < 1000000)
429                 vsel = 0;
430         else if (min_uV < 1700000)
431                 vsel = ((min_uV - 1000000) / 50000);
432         else
433                 vsel = ((min_uV - 1700000) / 100000)
434                         + WM831X_ALDO_SELECTOR_LOW + 1;
435
436         ret = wm831x_aldo_list_voltage(rdev, vsel);
437         if (ret < 0)
438                 return ret;
439         if (ret < min_uV || ret > max_uV)
440                 return -EINVAL;
441
442         *selector = vsel;
443
444         return wm831x_set_bits(wm831x, reg, WM831X_LDO7_ON_VSEL_MASK, vsel);
445 }
446
447 static int wm831x_aldo_set_voltage(struct regulator_dev *rdev,
448                                    int min_uV, int max_uV, unsigned *selector)
449 {
450         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
451         int reg = ldo->base + WM831X_LDO_ON_CONTROL;
452
453         return wm831x_aldo_set_voltage_int(rdev, reg, min_uV, max_uV,
454                                            selector);
455 }
456
457 static int wm831x_aldo_set_suspend_voltage(struct regulator_dev *rdev,
458                                              int uV)
459 {
460         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
461         int reg = ldo->base + WM831X_LDO_SLEEP_CONTROL;
462         unsigned int selector;
463
464         return wm831x_aldo_set_voltage_int(rdev, reg, uV, uV, &selector);
465 }
466
467 static int wm831x_aldo_get_voltage_sel(struct regulator_dev *rdev)
468 {
469         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
470         struct wm831x *wm831x = ldo->wm831x;
471         int reg = ldo->base + WM831X_LDO_ON_CONTROL;
472         int ret;
473
474         ret = wm831x_reg_read(wm831x, reg);
475         if (ret < 0)
476                 return ret;
477
478         ret &= WM831X_LDO7_ON_VSEL_MASK;
479
480         return ret;
481 }
482
483 static unsigned int wm831x_aldo_get_mode(struct regulator_dev *rdev)
484 {
485         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
486         struct wm831x *wm831x = ldo->wm831x;
487         int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
488         int ret;
489
490         ret = wm831x_reg_read(wm831x, on_reg);
491         if (ret < 0)
492                 return 0;
493
494         if (ret & WM831X_LDO7_ON_MODE)
495                 return REGULATOR_MODE_IDLE;
496         else
497                 return REGULATOR_MODE_NORMAL;
498 }
499
500 static int wm831x_aldo_set_mode(struct regulator_dev *rdev,
501                                   unsigned int mode)
502 {
503         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
504         struct wm831x *wm831x = ldo->wm831x;
505         int ctrl_reg = ldo->base + WM831X_LDO_CONTROL;
506         int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
507         int ret;
508
509
510         switch (mode) {
511         case REGULATOR_MODE_NORMAL:
512                 ret = wm831x_set_bits(wm831x, on_reg,
513                                       WM831X_LDO7_ON_MODE, 0);
514                 if (ret < 0)
515                         return ret;
516                 break;
517
518         case REGULATOR_MODE_IDLE:
519                 ret = wm831x_set_bits(wm831x, ctrl_reg,
520                                       WM831X_LDO7_ON_MODE,
521                                       WM831X_LDO7_ON_MODE);
522                 if (ret < 0)
523                         return ret;
524                 break;
525
526         default:
527                 return -EINVAL;
528         }
529
530         return 0;
531 }
532
533 static int wm831x_aldo_get_status(struct regulator_dev *rdev)
534 {
535         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
536         struct wm831x *wm831x = ldo->wm831x;
537         int mask = 1 << rdev_get_id(rdev);
538         int ret;
539
540         /* Is the regulator on? */
541         ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS);
542         if (ret < 0)
543                 return ret;
544         if (!(ret & mask))
545                 return REGULATOR_STATUS_OFF;
546
547         /* Is it reporting under voltage? */
548         ret = wm831x_reg_read(wm831x, WM831X_LDO_UV_STATUS);
549         if (ret & mask)
550                 return REGULATOR_STATUS_ERROR;
551
552         ret = wm831x_aldo_get_mode(rdev);
553         if (ret < 0)
554                 return ret;
555         else
556                 return regulator_mode_to_status(ret);
557 }
558
559 static struct regulator_ops wm831x_aldo_ops = {
560         .list_voltage = wm831x_aldo_list_voltage,
561         .get_voltage_sel = wm831x_aldo_get_voltage_sel,
562         .set_voltage = wm831x_aldo_set_voltage,
563         .set_suspend_voltage = wm831x_aldo_set_suspend_voltage,
564         .get_mode = wm831x_aldo_get_mode,
565         .set_mode = wm831x_aldo_set_mode,
566         .get_status = wm831x_aldo_get_status,
567
568         .is_enabled = wm831x_ldo_is_enabled,
569         .enable = wm831x_ldo_enable,
570         .disable = wm831x_ldo_disable,
571 };
572
573 static __devinit int wm831x_aldo_probe(struct platform_device *pdev)
574 {
575         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
576         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
577         int id = pdev->id % ARRAY_SIZE(pdata->ldo);
578         struct wm831x_ldo *ldo;
579         struct resource *res;
580         int ret, irq;
581
582         dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
583
584         if (pdata == NULL || pdata->ldo[id] == NULL)
585                 return -ENODEV;
586
587         ldo = kzalloc(sizeof(struct wm831x_ldo), GFP_KERNEL);
588         if (ldo == NULL) {
589                 dev_err(&pdev->dev, "Unable to allocate private data\n");
590                 return -ENOMEM;
591         }
592
593         ldo->wm831x = wm831x;
594
595         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
596         if (res == NULL) {
597                 dev_err(&pdev->dev, "No I/O resource\n");
598                 ret = -EINVAL;
599                 goto err;
600         }
601         ldo->base = res->start;
602
603         snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
604         ldo->desc.name = ldo->name;
605         ldo->desc.id = id;
606         ldo->desc.type = REGULATOR_VOLTAGE;
607         ldo->desc.n_voltages = WM831X_ALDO_MAX_SELECTOR + 1;
608         ldo->desc.ops = &wm831x_aldo_ops;
609         ldo->desc.owner = THIS_MODULE;
610
611         ldo->regulator = regulator_register(&ldo->desc, &pdev->dev,
612                                              pdata->ldo[id], ldo);
613         if (IS_ERR(ldo->regulator)) {
614                 ret = PTR_ERR(ldo->regulator);
615                 dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
616                         id + 1, ret);
617                 goto err;
618         }
619
620         irq = platform_get_irq_byname(pdev, "UV");
621         ret = request_threaded_irq(irq, NULL, wm831x_ldo_uv_irq,
622                                    IRQF_TRIGGER_RISING, ldo->name, ldo);
623         if (ret != 0) {
624                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
625                         irq, ret);
626                 goto err_regulator;
627         }
628
629         platform_set_drvdata(pdev, ldo);
630
631         return 0;
632
633 err_regulator:
634         regulator_unregister(ldo->regulator);
635 err:
636         kfree(ldo);
637         return ret;
638 }
639
640 static __devexit int wm831x_aldo_remove(struct platform_device *pdev)
641 {
642         struct wm831x_ldo *ldo = platform_get_drvdata(pdev);
643
644         free_irq(platform_get_irq_byname(pdev, "UV"), ldo);
645         regulator_unregister(ldo->regulator);
646         kfree(ldo);
647
648         return 0;
649 }
650
651 static struct platform_driver wm831x_aldo_driver = {
652         .probe = wm831x_aldo_probe,
653         .remove = __devexit_p(wm831x_aldo_remove),
654         .driver         = {
655                 .name   = "wm831x-aldo",
656                 .owner  = THIS_MODULE,
657         },
658 };
659
660 /*
661  * Alive LDO
662  */
663
664 #define WM831X_ALIVE_LDO_MAX_SELECTOR 0xf
665
666 static int wm831x_alive_ldo_list_voltage(struct regulator_dev *rdev,
667                                       unsigned int selector)
668 {
669         /* 0.8-1.55V in 50mV steps */
670         if (selector <= WM831X_ALIVE_LDO_MAX_SELECTOR)
671                 return 800000 + (selector * 50000);
672         return -EINVAL;
673 }
674
675 static int wm831x_alive_ldo_set_voltage_int(struct regulator_dev *rdev,
676                                             int reg,
677                                             int min_uV, int max_uV,
678                                             unsigned *selector)
679 {
680         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
681         struct wm831x *wm831x = ldo->wm831x;
682         int vsel, ret;
683
684         vsel = (min_uV - 800000) / 50000;
685
686         ret = wm831x_alive_ldo_list_voltage(rdev, vsel);
687         if (ret < 0)
688                 return ret;
689         if (ret < min_uV || ret > max_uV)
690                 return -EINVAL;
691
692         *selector = vsel;
693
694         return wm831x_set_bits(wm831x, reg, WM831X_LDO11_ON_VSEL_MASK, vsel);
695 }
696
697 static int wm831x_alive_ldo_set_voltage(struct regulator_dev *rdev,
698                                         int min_uV, int max_uV,
699                                         unsigned *selector)
700 {
701         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
702         int reg = ldo->base + WM831X_ALIVE_LDO_ON_CONTROL;
703
704         return wm831x_alive_ldo_set_voltage_int(rdev, reg, min_uV, max_uV,
705                                                 selector);
706 }
707
708 static int wm831x_alive_ldo_set_suspend_voltage(struct regulator_dev *rdev,
709                                              int uV)
710 {
711         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
712         int reg = ldo->base + WM831X_ALIVE_LDO_SLEEP_CONTROL;
713         unsigned selector;
714
715         return wm831x_alive_ldo_set_voltage_int(rdev, reg, uV, uV, &selector);
716 }
717
718 static int wm831x_alive_ldo_get_voltage_sel(struct regulator_dev *rdev)
719 {
720         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
721         struct wm831x *wm831x = ldo->wm831x;
722         int reg = ldo->base + WM831X_ALIVE_LDO_ON_CONTROL;
723         int ret;
724
725         ret = wm831x_reg_read(wm831x, reg);
726         if (ret < 0)
727                 return ret;
728
729         ret &= WM831X_LDO11_ON_VSEL_MASK;
730
731         return ret;
732 }
733
734 static int wm831x_alive_ldo_get_status(struct regulator_dev *rdev)
735 {
736         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
737         struct wm831x *wm831x = ldo->wm831x;
738         int mask = 1 << rdev_get_id(rdev);
739         int ret;
740
741         /* Is the regulator on? */
742         ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS);
743         if (ret < 0)
744                 return ret;
745         if (ret & mask)
746                 return REGULATOR_STATUS_ON;
747         else
748                 return REGULATOR_STATUS_OFF;
749 }
750
751 static struct regulator_ops wm831x_alive_ldo_ops = {
752         .list_voltage = wm831x_alive_ldo_list_voltage,
753         .get_voltage_sel = wm831x_alive_ldo_get_voltage_sel,
754         .set_voltage = wm831x_alive_ldo_set_voltage,
755         .set_suspend_voltage = wm831x_alive_ldo_set_suspend_voltage,
756         .get_status = wm831x_alive_ldo_get_status,
757
758         .is_enabled = wm831x_ldo_is_enabled,
759         .enable = wm831x_ldo_enable,
760         .disable = wm831x_ldo_disable,
761 };
762
763 static __devinit int wm831x_alive_ldo_probe(struct platform_device *pdev)
764 {
765         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
766         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
767         int id = pdev->id % ARRAY_SIZE(pdata->ldo);
768         struct wm831x_ldo *ldo;
769         struct resource *res;
770         int ret;
771
772         dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
773
774         if (pdata == NULL || pdata->ldo[id] == NULL)
775                 return -ENODEV;
776
777         ldo = kzalloc(sizeof(struct wm831x_ldo), GFP_KERNEL);
778         if (ldo == NULL) {
779                 dev_err(&pdev->dev, "Unable to allocate private data\n");
780                 return -ENOMEM;
781         }
782
783         ldo->wm831x = wm831x;
784
785         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
786         if (res == NULL) {
787                 dev_err(&pdev->dev, "No I/O resource\n");
788                 ret = -EINVAL;
789                 goto err;
790         }
791         ldo->base = res->start;
792
793         snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
794         ldo->desc.name = ldo->name;
795         ldo->desc.id = id;
796         ldo->desc.type = REGULATOR_VOLTAGE;
797         ldo->desc.n_voltages = WM831X_ALIVE_LDO_MAX_SELECTOR + 1;
798         ldo->desc.ops = &wm831x_alive_ldo_ops;
799         ldo->desc.owner = THIS_MODULE;
800
801         ldo->regulator = regulator_register(&ldo->desc, &pdev->dev,
802                                              pdata->ldo[id], ldo);
803         if (IS_ERR(ldo->regulator)) {
804                 ret = PTR_ERR(ldo->regulator);
805                 dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
806                         id + 1, ret);
807                 goto err;
808         }
809
810         platform_set_drvdata(pdev, ldo);
811
812         return 0;
813
814 err:
815         kfree(ldo);
816         return ret;
817 }
818
819 static __devexit int wm831x_alive_ldo_remove(struct platform_device *pdev)
820 {
821         struct wm831x_ldo *ldo = platform_get_drvdata(pdev);
822
823         regulator_unregister(ldo->regulator);
824         kfree(ldo);
825
826         return 0;
827 }
828
829 static struct platform_driver wm831x_alive_ldo_driver = {
830         .probe = wm831x_alive_ldo_probe,
831         .remove = __devexit_p(wm831x_alive_ldo_remove),
832         .driver         = {
833                 .name   = "wm831x-alive-ldo",
834                 .owner  = THIS_MODULE,
835         },
836 };
837
838 static int __init wm831x_ldo_init(void)
839 {
840         int ret;
841
842         ret = platform_driver_register(&wm831x_gp_ldo_driver);
843         if (ret != 0)
844                 pr_err("Failed to register WM831x GP LDO driver: %d\n", ret);
845
846         ret = platform_driver_register(&wm831x_aldo_driver);
847         if (ret != 0)
848                 pr_err("Failed to register WM831x ALDO driver: %d\n", ret);
849
850         ret = platform_driver_register(&wm831x_alive_ldo_driver);
851         if (ret != 0)
852                 pr_err("Failed to register WM831x alive LDO driver: %d\n",
853                        ret);
854
855         return 0;
856 }
857 subsys_initcall(wm831x_ldo_init);
858
859 static void __exit wm831x_ldo_exit(void)
860 {
861         platform_driver_unregister(&wm831x_alive_ldo_driver);
862         platform_driver_unregister(&wm831x_aldo_driver);
863         platform_driver_unregister(&wm831x_gp_ldo_driver);
864 }
865 module_exit(wm831x_ldo_exit);
866
867 /* Module information */
868 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
869 MODULE_DESCRIPTION("WM831x LDO driver");
870 MODULE_LICENSE("GPL");
871 MODULE_ALIAS("platform:wm831x-ldo");
872 MODULE_ALIAS("platform:wm831x-aldo");
873 MODULE_ALIAS("platform:wm831x-aliveldo");