regulator: palmas: Fix warning message
[linux-2.6.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;
314         struct wm831x_ldo *ldo;
315         struct resource *res;
316         int ret, irq;
317
318         if (pdata && pdata->wm831x_num)
319                 id = (pdata->wm831x_num * 10) + 1;
320         else
321                 id = 0;
322         id = pdev->id - id;
323
324         dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
325
326         if (pdata == NULL || pdata->ldo[id] == NULL)
327                 return -ENODEV;
328
329         ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL);
330         if (ldo == NULL) {
331                 dev_err(&pdev->dev, "Unable to allocate private data\n");
332                 return -ENOMEM;
333         }
334
335         ldo->wm831x = wm831x;
336
337         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
338         if (res == NULL) {
339                 dev_err(&pdev->dev, "No I/O resource\n");
340                 ret = -EINVAL;
341                 goto err;
342         }
343         ldo->base = res->start;
344
345         snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
346         ldo->desc.name = ldo->name;
347         ldo->desc.id = id;
348         ldo->desc.type = REGULATOR_VOLTAGE;
349         ldo->desc.n_voltages = WM831X_GP_LDO_MAX_SELECTOR + 1;
350         ldo->desc.ops = &wm831x_gp_ldo_ops;
351         ldo->desc.owner = THIS_MODULE;
352
353         ldo->regulator = regulator_register(&ldo->desc, &pdev->dev,
354                                              pdata->ldo[id], ldo, NULL);
355         if (IS_ERR(ldo->regulator)) {
356                 ret = PTR_ERR(ldo->regulator);
357                 dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
358                         id + 1, ret);
359                 goto err;
360         }
361
362         irq = platform_get_irq_byname(pdev, "UV");
363         ret = request_threaded_irq(irq, NULL, wm831x_ldo_uv_irq,
364                                    IRQF_TRIGGER_RISING, ldo->name,
365                                    ldo);
366         if (ret != 0) {
367                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
368                         irq, ret);
369                 goto err_regulator;
370         }
371
372         platform_set_drvdata(pdev, ldo);
373
374         return 0;
375
376 err_regulator:
377         regulator_unregister(ldo->regulator);
378 err:
379         return ret;
380 }
381
382 static __devexit int wm831x_gp_ldo_remove(struct platform_device *pdev)
383 {
384         struct wm831x_ldo *ldo = platform_get_drvdata(pdev);
385
386         platform_set_drvdata(pdev, NULL);
387
388         free_irq(platform_get_irq_byname(pdev, "UV"), ldo);
389         regulator_unregister(ldo->regulator);
390
391         return 0;
392 }
393
394 static struct platform_driver wm831x_gp_ldo_driver = {
395         .probe = wm831x_gp_ldo_probe,
396         .remove = __devexit_p(wm831x_gp_ldo_remove),
397         .driver         = {
398                 .name   = "wm831x-ldo",
399                 .owner  = THIS_MODULE,
400         },
401 };
402
403 /*
404  * Analogue LDOs
405  */
406
407
408 #define WM831X_ALDO_SELECTOR_LOW 0xc
409 #define WM831X_ALDO_MAX_SELECTOR 0x1f
410
411 static int wm831x_aldo_list_voltage(struct regulator_dev *rdev,
412                                       unsigned int selector)
413 {
414         /* 1-1.6V in 50mV steps */
415         if (selector <= WM831X_ALDO_SELECTOR_LOW)
416                 return 1000000 + (selector * 50000);
417         /* 1.7-3.5V in 50mV steps */
418         if (selector <= WM831X_ALDO_MAX_SELECTOR)
419                 return 1600000 + ((selector - WM831X_ALDO_SELECTOR_LOW)
420                                   * 100000);
421         return -EINVAL;
422 }
423
424 static int wm831x_aldo_set_voltage_int(struct regulator_dev *rdev, int reg,
425                                        int min_uV, int max_uV,
426                                        unsigned *selector)
427 {
428         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
429         struct wm831x *wm831x = ldo->wm831x;
430         int vsel, ret;
431
432         if (min_uV < 1000000)
433                 vsel = 0;
434         else if (min_uV < 1700000)
435                 vsel = ((min_uV - 1000000) / 50000);
436         else
437                 vsel = ((min_uV - 1700000) / 100000)
438                         + WM831X_ALDO_SELECTOR_LOW + 1;
439
440         ret = wm831x_aldo_list_voltage(rdev, vsel);
441         if (ret < 0)
442                 return ret;
443         if (ret < min_uV || ret > max_uV)
444                 return -EINVAL;
445
446         *selector = vsel;
447
448         return wm831x_set_bits(wm831x, reg, WM831X_LDO7_ON_VSEL_MASK, vsel);
449 }
450
451 static int wm831x_aldo_set_voltage(struct regulator_dev *rdev,
452                                    int min_uV, int max_uV, unsigned *selector)
453 {
454         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
455         int reg = ldo->base + WM831X_LDO_ON_CONTROL;
456
457         return wm831x_aldo_set_voltage_int(rdev, reg, min_uV, max_uV,
458                                            selector);
459 }
460
461 static int wm831x_aldo_set_suspend_voltage(struct regulator_dev *rdev,
462                                              int uV)
463 {
464         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
465         int reg = ldo->base + WM831X_LDO_SLEEP_CONTROL;
466         unsigned int selector;
467
468         return wm831x_aldo_set_voltage_int(rdev, reg, uV, uV, &selector);
469 }
470
471 static int wm831x_aldo_get_voltage_sel(struct regulator_dev *rdev)
472 {
473         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
474         struct wm831x *wm831x = ldo->wm831x;
475         int reg = ldo->base + WM831X_LDO_ON_CONTROL;
476         int ret;
477
478         ret = wm831x_reg_read(wm831x, reg);
479         if (ret < 0)
480                 return ret;
481
482         ret &= WM831X_LDO7_ON_VSEL_MASK;
483
484         return ret;
485 }
486
487 static unsigned int wm831x_aldo_get_mode(struct regulator_dev *rdev)
488 {
489         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
490         struct wm831x *wm831x = ldo->wm831x;
491         int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
492         int ret;
493
494         ret = wm831x_reg_read(wm831x, on_reg);
495         if (ret < 0)
496                 return 0;
497
498         if (ret & WM831X_LDO7_ON_MODE)
499                 return REGULATOR_MODE_IDLE;
500         else
501                 return REGULATOR_MODE_NORMAL;
502 }
503
504 static int wm831x_aldo_set_mode(struct regulator_dev *rdev,
505                                   unsigned int mode)
506 {
507         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
508         struct wm831x *wm831x = ldo->wm831x;
509         int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
510         int ret;
511
512
513         switch (mode) {
514         case REGULATOR_MODE_NORMAL:
515                 ret = wm831x_set_bits(wm831x, on_reg, WM831X_LDO7_ON_MODE, 0);
516                 if (ret < 0)
517                         return ret;
518                 break;
519
520         case REGULATOR_MODE_IDLE:
521                 ret = wm831x_set_bits(wm831x, on_reg, WM831X_LDO7_ON_MODE,
522                                       WM831X_LDO7_ON_MODE);
523                 if (ret < 0)
524                         return ret;
525                 break;
526
527         default:
528                 return -EINVAL;
529         }
530
531         return 0;
532 }
533
534 static int wm831x_aldo_get_status(struct regulator_dev *rdev)
535 {
536         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
537         struct wm831x *wm831x = ldo->wm831x;
538         int mask = 1 << rdev_get_id(rdev);
539         int ret;
540
541         /* Is the regulator on? */
542         ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS);
543         if (ret < 0)
544                 return ret;
545         if (!(ret & mask))
546                 return REGULATOR_STATUS_OFF;
547
548         /* Is it reporting under voltage? */
549         ret = wm831x_reg_read(wm831x, WM831X_LDO_UV_STATUS);
550         if (ret & mask)
551                 return REGULATOR_STATUS_ERROR;
552
553         ret = wm831x_aldo_get_mode(rdev);
554         if (ret < 0)
555                 return ret;
556         else
557                 return regulator_mode_to_status(ret);
558 }
559
560 static struct regulator_ops wm831x_aldo_ops = {
561         .list_voltage = wm831x_aldo_list_voltage,
562         .get_voltage_sel = wm831x_aldo_get_voltage_sel,
563         .set_voltage = wm831x_aldo_set_voltage,
564         .set_suspend_voltage = wm831x_aldo_set_suspend_voltage,
565         .get_mode = wm831x_aldo_get_mode,
566         .set_mode = wm831x_aldo_set_mode,
567         .get_status = wm831x_aldo_get_status,
568
569         .is_enabled = wm831x_ldo_is_enabled,
570         .enable = wm831x_ldo_enable,
571         .disable = wm831x_ldo_disable,
572 };
573
574 static __devinit int wm831x_aldo_probe(struct platform_device *pdev)
575 {
576         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
577         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
578         int id;
579         struct wm831x_ldo *ldo;
580         struct resource *res;
581         int ret, irq;
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         dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
590
591         if (pdata == NULL || pdata->ldo[id] == NULL)
592                 return -ENODEV;
593
594         ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL);
595         if (ldo == NULL) {
596                 dev_err(&pdev->dev, "Unable to allocate private data\n");
597                 return -ENOMEM;
598         }
599
600         ldo->wm831x = wm831x;
601
602         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
603         if (res == NULL) {
604                 dev_err(&pdev->dev, "No I/O resource\n");
605                 ret = -EINVAL;
606                 goto err;
607         }
608         ldo->base = res->start;
609
610         snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
611         ldo->desc.name = ldo->name;
612         ldo->desc.id = id;
613         ldo->desc.type = REGULATOR_VOLTAGE;
614         ldo->desc.n_voltages = WM831X_ALDO_MAX_SELECTOR + 1;
615         ldo->desc.ops = &wm831x_aldo_ops;
616         ldo->desc.owner = THIS_MODULE;
617
618         ldo->regulator = regulator_register(&ldo->desc, &pdev->dev,
619                                              pdata->ldo[id], ldo, NULL);
620         if (IS_ERR(ldo->regulator)) {
621                 ret = PTR_ERR(ldo->regulator);
622                 dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
623                         id + 1, ret);
624                 goto err;
625         }
626
627         irq = platform_get_irq_byname(pdev, "UV");
628         ret = request_threaded_irq(irq, NULL, wm831x_ldo_uv_irq,
629                                    IRQF_TRIGGER_RISING, ldo->name, ldo);
630         if (ret != 0) {
631                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
632                         irq, ret);
633                 goto err_regulator;
634         }
635
636         platform_set_drvdata(pdev, ldo);
637
638         return 0;
639
640 err_regulator:
641         regulator_unregister(ldo->regulator);
642 err:
643         return ret;
644 }
645
646 static __devexit int wm831x_aldo_remove(struct platform_device *pdev)
647 {
648         struct wm831x_ldo *ldo = platform_get_drvdata(pdev);
649
650         free_irq(platform_get_irq_byname(pdev, "UV"), ldo);
651         regulator_unregister(ldo->regulator);
652
653         return 0;
654 }
655
656 static struct platform_driver wm831x_aldo_driver = {
657         .probe = wm831x_aldo_probe,
658         .remove = __devexit_p(wm831x_aldo_remove),
659         .driver         = {
660                 .name   = "wm831x-aldo",
661                 .owner  = THIS_MODULE,
662         },
663 };
664
665 /*
666  * Alive LDO
667  */
668
669 #define WM831X_ALIVE_LDO_MAX_SELECTOR 0xf
670
671 static int wm831x_alive_ldo_list_voltage(struct regulator_dev *rdev,
672                                       unsigned int selector)
673 {
674         /* 0.8-1.55V in 50mV steps */
675         if (selector <= WM831X_ALIVE_LDO_MAX_SELECTOR)
676                 return 800000 + (selector * 50000);
677         return -EINVAL;
678 }
679
680 static int wm831x_alive_ldo_set_voltage_int(struct regulator_dev *rdev,
681                                             int reg,
682                                             int min_uV, int max_uV,
683                                             unsigned *selector)
684 {
685         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
686         struct wm831x *wm831x = ldo->wm831x;
687         int vsel, ret;
688
689         vsel = (min_uV - 800000) / 50000;
690
691         ret = wm831x_alive_ldo_list_voltage(rdev, vsel);
692         if (ret < 0)
693                 return ret;
694         if (ret < min_uV || ret > max_uV)
695                 return -EINVAL;
696
697         *selector = vsel;
698
699         return wm831x_set_bits(wm831x, reg, WM831X_LDO11_ON_VSEL_MASK, vsel);
700 }
701
702 static int wm831x_alive_ldo_set_voltage(struct regulator_dev *rdev,
703                                         int min_uV, int max_uV,
704                                         unsigned *selector)
705 {
706         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
707         int reg = ldo->base + WM831X_ALIVE_LDO_ON_CONTROL;
708
709         return wm831x_alive_ldo_set_voltage_int(rdev, reg, min_uV, max_uV,
710                                                 selector);
711 }
712
713 static int wm831x_alive_ldo_set_suspend_voltage(struct regulator_dev *rdev,
714                                              int uV)
715 {
716         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
717         int reg = ldo->base + WM831X_ALIVE_LDO_SLEEP_CONTROL;
718         unsigned selector;
719
720         return wm831x_alive_ldo_set_voltage_int(rdev, reg, uV, uV, &selector);
721 }
722
723 static int wm831x_alive_ldo_get_voltage_sel(struct regulator_dev *rdev)
724 {
725         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
726         struct wm831x *wm831x = ldo->wm831x;
727         int reg = ldo->base + WM831X_ALIVE_LDO_ON_CONTROL;
728         int ret;
729
730         ret = wm831x_reg_read(wm831x, reg);
731         if (ret < 0)
732                 return ret;
733
734         ret &= WM831X_LDO11_ON_VSEL_MASK;
735
736         return ret;
737 }
738
739 static int wm831x_alive_ldo_get_status(struct regulator_dev *rdev)
740 {
741         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
742         struct wm831x *wm831x = ldo->wm831x;
743         int mask = 1 << rdev_get_id(rdev);
744         int ret;
745
746         /* Is the regulator on? */
747         ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS);
748         if (ret < 0)
749                 return ret;
750         if (ret & mask)
751                 return REGULATOR_STATUS_ON;
752         else
753                 return REGULATOR_STATUS_OFF;
754 }
755
756 static struct regulator_ops wm831x_alive_ldo_ops = {
757         .list_voltage = wm831x_alive_ldo_list_voltage,
758         .get_voltage_sel = wm831x_alive_ldo_get_voltage_sel,
759         .set_voltage = wm831x_alive_ldo_set_voltage,
760         .set_suspend_voltage = wm831x_alive_ldo_set_suspend_voltage,
761         .get_status = wm831x_alive_ldo_get_status,
762
763         .is_enabled = wm831x_ldo_is_enabled,
764         .enable = wm831x_ldo_enable,
765         .disable = wm831x_ldo_disable,
766 };
767
768 static __devinit int wm831x_alive_ldo_probe(struct platform_device *pdev)
769 {
770         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
771         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
772         int id;
773         struct wm831x_ldo *ldo;
774         struct resource *res;
775         int ret;
776
777         if (pdata && pdata->wm831x_num)
778                 id = (pdata->wm831x_num * 10) + 1;
779         else
780                 id = 0;
781         id = pdev->id - id;
782
783
784         dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
785
786         if (pdata == NULL || pdata->ldo[id] == NULL)
787                 return -ENODEV;
788
789         ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL);
790         if (ldo == NULL) {
791                 dev_err(&pdev->dev, "Unable to allocate private data\n");
792                 return -ENOMEM;
793         }
794
795         ldo->wm831x = wm831x;
796
797         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
798         if (res == NULL) {
799                 dev_err(&pdev->dev, "No I/O resource\n");
800                 ret = -EINVAL;
801                 goto err;
802         }
803         ldo->base = res->start;
804
805         snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
806         ldo->desc.name = ldo->name;
807         ldo->desc.id = id;
808         ldo->desc.type = REGULATOR_VOLTAGE;
809         ldo->desc.n_voltages = WM831X_ALIVE_LDO_MAX_SELECTOR + 1;
810         ldo->desc.ops = &wm831x_alive_ldo_ops;
811         ldo->desc.owner = THIS_MODULE;
812
813         ldo->regulator = regulator_register(&ldo->desc, &pdev->dev,
814                                              pdata->ldo[id], ldo, NULL);
815         if (IS_ERR(ldo->regulator)) {
816                 ret = PTR_ERR(ldo->regulator);
817                 dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
818                         id + 1, ret);
819                 goto err;
820         }
821
822         platform_set_drvdata(pdev, ldo);
823
824         return 0;
825
826 err:
827         return ret;
828 }
829
830 static __devexit int wm831x_alive_ldo_remove(struct platform_device *pdev)
831 {
832         struct wm831x_ldo *ldo = platform_get_drvdata(pdev);
833
834         regulator_unregister(ldo->regulator);
835
836         return 0;
837 }
838
839 static struct platform_driver wm831x_alive_ldo_driver = {
840         .probe = wm831x_alive_ldo_probe,
841         .remove = __devexit_p(wm831x_alive_ldo_remove),
842         .driver         = {
843                 .name   = "wm831x-alive-ldo",
844                 .owner  = THIS_MODULE,
845         },
846 };
847
848 static int __init wm831x_ldo_init(void)
849 {
850         int ret;
851
852         ret = platform_driver_register(&wm831x_gp_ldo_driver);
853         if (ret != 0)
854                 pr_err("Failed to register WM831x GP LDO driver: %d\n", ret);
855
856         ret = platform_driver_register(&wm831x_aldo_driver);
857         if (ret != 0)
858                 pr_err("Failed to register WM831x ALDO driver: %d\n", ret);
859
860         ret = platform_driver_register(&wm831x_alive_ldo_driver);
861         if (ret != 0)
862                 pr_err("Failed to register WM831x alive LDO driver: %d\n",
863                        ret);
864
865         return 0;
866 }
867 subsys_initcall(wm831x_ldo_init);
868
869 static void __exit wm831x_ldo_exit(void)
870 {
871         platform_driver_unregister(&wm831x_alive_ldo_driver);
872         platform_driver_unregister(&wm831x_aldo_driver);
873         platform_driver_unregister(&wm831x_gp_ldo_driver);
874 }
875 module_exit(wm831x_ldo_exit);
876
877 /* Module information */
878 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
879 MODULE_DESCRIPTION("WM831x LDO driver");
880 MODULE_LICENSE("GPL");
881 MODULE_ALIAS("platform:wm831x-ldo");
882 MODULE_ALIAS("platform:wm831x-aldo");
883 MODULE_ALIAS("platform:wm831x-aliveldo");