regulator: Add EPEs to the MODULE_ALIAS() for wm831x-dcdc
[linux-2.6.git] / drivers / regulator / wm831x-dcdc.c
1 /*
2  * wm831x-dcdc.c  --  DC-DC buck convertor 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/regulator/machine.h>
23 #include <linux/gpio.h>
24 #include <linux/slab.h>
25
26 #include <linux/mfd/wm831x/core.h>
27 #include <linux/mfd/wm831x/regulator.h>
28 #include <linux/mfd/wm831x/pdata.h>
29
30 #define WM831X_BUCKV_MAX_SELECTOR 0x68
31 #define WM831X_BUCKP_MAX_SELECTOR 0x66
32
33 #define WM831X_DCDC_MODE_FAST    0
34 #define WM831X_DCDC_MODE_NORMAL  1
35 #define WM831X_DCDC_MODE_IDLE    2
36 #define WM831X_DCDC_MODE_STANDBY 3
37
38 #define WM831X_DCDC_MAX_NAME 6
39
40 /* Register offsets in control block */
41 #define WM831X_DCDC_CONTROL_1     0
42 #define WM831X_DCDC_CONTROL_2     1
43 #define WM831X_DCDC_ON_CONFIG     2
44 #define WM831X_DCDC_SLEEP_CONTROL 3
45 #define WM831X_DCDC_DVS_CONTROL   4
46
47 /*
48  * Shared
49  */
50
51 struct wm831x_dcdc {
52         char name[WM831X_DCDC_MAX_NAME];
53         struct regulator_desc desc;
54         int base;
55         struct wm831x *wm831x;
56         struct regulator_dev *regulator;
57         int dvs_gpio;
58         int dvs_gpio_state;
59         int on_vsel;
60         int dvs_vsel;
61 };
62
63 static int wm831x_dcdc_is_enabled(struct regulator_dev *rdev)
64 {
65         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
66         struct wm831x *wm831x = dcdc->wm831x;
67         int mask = 1 << rdev_get_id(rdev);
68         int reg;
69
70         reg = wm831x_reg_read(wm831x, WM831X_DCDC_ENABLE);
71         if (reg < 0)
72                 return reg;
73
74         if (reg & mask)
75                 return 1;
76         else
77                 return 0;
78 }
79
80 static int wm831x_dcdc_enable(struct regulator_dev *rdev)
81 {
82         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
83         struct wm831x *wm831x = dcdc->wm831x;
84         int mask = 1 << rdev_get_id(rdev);
85
86         return wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE, mask, mask);
87 }
88
89 static int wm831x_dcdc_disable(struct regulator_dev *rdev)
90 {
91         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
92         struct wm831x *wm831x = dcdc->wm831x;
93         int mask = 1 << rdev_get_id(rdev);
94
95         return wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE, mask, 0);
96 }
97
98 static unsigned int wm831x_dcdc_get_mode(struct regulator_dev *rdev)
99
100 {
101         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
102         struct wm831x *wm831x = dcdc->wm831x;
103         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
104         int val;
105
106         val = wm831x_reg_read(wm831x, reg);
107         if (val < 0)
108                 return val;
109
110         val = (val & WM831X_DC1_ON_MODE_MASK) >> WM831X_DC1_ON_MODE_SHIFT;
111
112         switch (val) {
113         case WM831X_DCDC_MODE_FAST:
114                 return REGULATOR_MODE_FAST;
115         case WM831X_DCDC_MODE_NORMAL:
116                 return REGULATOR_MODE_NORMAL;
117         case WM831X_DCDC_MODE_STANDBY:
118                 return REGULATOR_MODE_STANDBY;
119         case WM831X_DCDC_MODE_IDLE:
120                 return REGULATOR_MODE_IDLE;
121         default:
122                 BUG();
123                 return -EINVAL;
124         }
125 }
126
127 static int wm831x_dcdc_set_mode_int(struct wm831x *wm831x, int reg,
128                                     unsigned int mode)
129 {
130         int val;
131
132         switch (mode) {
133         case REGULATOR_MODE_FAST:
134                 val = WM831X_DCDC_MODE_FAST;
135                 break;
136         case REGULATOR_MODE_NORMAL:
137                 val = WM831X_DCDC_MODE_NORMAL;
138                 break;
139         case REGULATOR_MODE_STANDBY:
140                 val = WM831X_DCDC_MODE_STANDBY;
141                 break;
142         case REGULATOR_MODE_IDLE:
143                 val = WM831X_DCDC_MODE_IDLE;
144                 break;
145         default:
146                 return -EINVAL;
147         }
148
149         return wm831x_set_bits(wm831x, reg, WM831X_DC1_ON_MODE_MASK,
150                                val << WM831X_DC1_ON_MODE_SHIFT);
151 }
152
153 static int wm831x_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode)
154 {
155         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
156         struct wm831x *wm831x = dcdc->wm831x;
157         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
158
159         return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
160 }
161
162 static int wm831x_dcdc_set_suspend_mode(struct regulator_dev *rdev,
163                                         unsigned int mode)
164 {
165         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
166         struct wm831x *wm831x = dcdc->wm831x;
167         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
168
169         return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
170 }
171
172 static int wm831x_dcdc_get_status(struct regulator_dev *rdev)
173 {
174         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
175         struct wm831x *wm831x = dcdc->wm831x;
176         int ret;
177
178         /* First, check for errors */
179         ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
180         if (ret < 0)
181                 return ret;
182
183         if (ret & (1 << rdev_get_id(rdev))) {
184                 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
185                         rdev_get_id(rdev) + 1);
186                 return REGULATOR_STATUS_ERROR;
187         }
188
189         /* DCDC1 and DCDC2 can additionally detect high voltage/current */
190         if (rdev_get_id(rdev) < 2) {
191                 if (ret & (WM831X_DC1_OV_STS << rdev_get_id(rdev))) {
192                         dev_dbg(wm831x->dev, "DCDC%d over voltage\n",
193                                 rdev_get_id(rdev) + 1);
194                         return REGULATOR_STATUS_ERROR;
195                 }
196
197                 if (ret & (WM831X_DC1_HC_STS << rdev_get_id(rdev))) {
198                         dev_dbg(wm831x->dev, "DCDC%d over current\n",
199                                 rdev_get_id(rdev) + 1);
200                         return REGULATOR_STATUS_ERROR;
201                 }
202         }
203
204         /* Is the regulator on? */
205         ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
206         if (ret < 0)
207                 return ret;
208         if (!(ret & (1 << rdev_get_id(rdev))))
209                 return REGULATOR_STATUS_OFF;
210
211         /* TODO: When we handle hardware control modes so we can report the
212          * current mode. */
213         return REGULATOR_STATUS_ON;
214 }
215
216 static irqreturn_t wm831x_dcdc_uv_irq(int irq, void *data)
217 {
218         struct wm831x_dcdc *dcdc = data;
219
220         regulator_notifier_call_chain(dcdc->regulator,
221                                       REGULATOR_EVENT_UNDER_VOLTAGE,
222                                       NULL);
223
224         return IRQ_HANDLED;
225 }
226
227 static irqreturn_t wm831x_dcdc_oc_irq(int irq, void *data)
228 {
229         struct wm831x_dcdc *dcdc = data;
230
231         regulator_notifier_call_chain(dcdc->regulator,
232                                       REGULATOR_EVENT_OVER_CURRENT,
233                                       NULL);
234
235         return IRQ_HANDLED;
236 }
237
238 /*
239  * BUCKV specifics
240  */
241
242 static int wm831x_buckv_list_voltage(struct regulator_dev *rdev,
243                                       unsigned selector)
244 {
245         if (selector <= 0x8)
246                 return 600000;
247         if (selector <= WM831X_BUCKV_MAX_SELECTOR)
248                 return 600000 + ((selector - 0x8) * 12500);
249         return -EINVAL;
250 }
251
252 static int wm831x_buckv_select_min_voltage(struct regulator_dev *rdev,
253                                            int min_uV, int max_uV)
254 {
255         u16 vsel;
256
257         if (min_uV < 600000)
258                 vsel = 0;
259         else if (min_uV <= 1800000)
260                 vsel = ((min_uV - 600000) / 12500) + 8;
261         else
262                 return -EINVAL;
263
264         if (wm831x_buckv_list_voltage(rdev, vsel) > max_uV)
265                 return -EINVAL;
266
267         return vsel;
268 }
269
270 static int wm831x_buckv_select_max_voltage(struct regulator_dev *rdev,
271                                            int min_uV, int max_uV)
272 {
273         u16 vsel;
274
275         if (max_uV < 600000 || max_uV > 1800000)
276                 return -EINVAL;
277
278         vsel = ((max_uV - 600000) / 12500) + 8;
279
280         if (wm831x_buckv_list_voltage(rdev, vsel) < min_uV ||
281             wm831x_buckv_list_voltage(rdev, vsel) < max_uV)
282                 return -EINVAL;
283
284         return vsel;
285 }
286
287 static int wm831x_buckv_set_dvs(struct regulator_dev *rdev, int state)
288 {
289         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
290
291         if (state == dcdc->dvs_gpio_state)
292                 return 0;
293
294         dcdc->dvs_gpio_state = state;
295         gpio_set_value(dcdc->dvs_gpio, state);
296
297         /* Should wait for DVS state change to be asserted if we have
298          * a GPIO for it, for now assume the device is configured
299          * for the fastest possible transition.
300          */
301
302         return 0;
303 }
304
305 static int wm831x_buckv_set_voltage(struct regulator_dev *rdev,
306                                     int min_uV, int max_uV, unsigned *selector)
307 {
308         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
309         struct wm831x *wm831x = dcdc->wm831x;
310         int on_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
311         int dvs_reg = dcdc->base + WM831X_DCDC_DVS_CONTROL;
312         int vsel, ret;
313
314         vsel = wm831x_buckv_select_min_voltage(rdev, min_uV, max_uV);
315         if (vsel < 0)
316                 return vsel;
317
318         *selector = vsel;
319
320         /* If this value is already set then do a GPIO update if we can */
321         if (dcdc->dvs_gpio && dcdc->on_vsel == vsel)
322                 return wm831x_buckv_set_dvs(rdev, 0);
323
324         if (dcdc->dvs_gpio && dcdc->dvs_vsel == vsel)
325                 return wm831x_buckv_set_dvs(rdev, 1);
326
327         /* Always set the ON status to the minimum voltage */
328         ret = wm831x_set_bits(wm831x, on_reg, WM831X_DC1_ON_VSEL_MASK, vsel);
329         if (ret < 0)
330                 return ret;
331         dcdc->on_vsel = vsel;
332
333         if (!dcdc->dvs_gpio)
334                 return ret;
335
336         /* Kick the voltage transition now */
337         ret = wm831x_buckv_set_dvs(rdev, 0);
338         if (ret < 0)
339                 return ret;
340
341         /* Set the high voltage as the DVS voltage.  This is optimised
342          * for CPUfreq usage, most processors will keep the maximum
343          * voltage constant and lower the minimum with the frequency. */
344         vsel = wm831x_buckv_select_max_voltage(rdev, min_uV, max_uV);
345         if (vsel < 0) {
346                 /* This should never happen - at worst the same vsel
347                  * should be chosen */
348                 WARN_ON(vsel < 0);
349                 return 0;
350         }
351
352         /* Don't bother if it's the same VSEL we're already using */
353         if (vsel == dcdc->on_vsel)
354                 return 0;
355
356         ret = wm831x_set_bits(wm831x, dvs_reg, WM831X_DC1_DVS_VSEL_MASK, vsel);
357         if (ret == 0)
358                 dcdc->dvs_vsel = vsel;
359         else
360                 dev_warn(wm831x->dev, "Failed to set DCDC DVS VSEL: %d\n",
361                          ret);
362
363         return 0;
364 }
365
366 static int wm831x_buckv_set_suspend_voltage(struct regulator_dev *rdev,
367                                             int uV)
368 {
369         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
370         struct wm831x *wm831x = dcdc->wm831x;
371         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
372         int vsel;
373
374         vsel = wm831x_buckv_select_min_voltage(rdev, uV, uV);
375         if (vsel < 0)
376                 return vsel;
377
378         return wm831x_set_bits(wm831x, reg, WM831X_DC1_SLP_VSEL_MASK, vsel);
379 }
380
381 static int wm831x_buckv_get_voltage_sel(struct regulator_dev *rdev)
382 {
383         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
384
385         if (dcdc->dvs_gpio && dcdc->dvs_gpio_state)
386                 return dcdc->dvs_vsel;
387         else
388                 return dcdc->on_vsel;
389 }
390
391 /* Current limit options */
392 static u16 wm831x_dcdc_ilim[] = {
393         125, 250, 375, 500, 625, 750, 875, 1000
394 };
395
396 static int wm831x_buckv_set_current_limit(struct regulator_dev *rdev,
397                                            int min_uA, int max_uA)
398 {
399         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
400         struct wm831x *wm831x = dcdc->wm831x;
401         u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
402         int i;
403
404         for (i = 0; i < ARRAY_SIZE(wm831x_dcdc_ilim); i++) {
405                 if (max_uA <= wm831x_dcdc_ilim[i])
406                         break;
407         }
408         if (i == ARRAY_SIZE(wm831x_dcdc_ilim))
409                 return -EINVAL;
410
411         return wm831x_set_bits(wm831x, reg, WM831X_DC1_HC_THR_MASK, i);
412 }
413
414 static int wm831x_buckv_get_current_limit(struct regulator_dev *rdev)
415 {
416         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
417         struct wm831x *wm831x = dcdc->wm831x;
418         u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
419         int val;
420
421         val = wm831x_reg_read(wm831x, reg);
422         if (val < 0)
423                 return val;
424
425         return wm831x_dcdc_ilim[val & WM831X_DC1_HC_THR_MASK];
426 }
427
428 static struct regulator_ops wm831x_buckv_ops = {
429         .set_voltage = wm831x_buckv_set_voltage,
430         .get_voltage_sel = wm831x_buckv_get_voltage_sel,
431         .list_voltage = wm831x_buckv_list_voltage,
432         .set_suspend_voltage = wm831x_buckv_set_suspend_voltage,
433         .set_current_limit = wm831x_buckv_set_current_limit,
434         .get_current_limit = wm831x_buckv_get_current_limit,
435
436         .is_enabled = wm831x_dcdc_is_enabled,
437         .enable = wm831x_dcdc_enable,
438         .disable = wm831x_dcdc_disable,
439         .get_status = wm831x_dcdc_get_status,
440         .get_mode = wm831x_dcdc_get_mode,
441         .set_mode = wm831x_dcdc_set_mode,
442         .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
443 };
444
445 /*
446  * Set up DVS control.  We just log errors since we can still run
447  * (with reduced performance) if we fail.
448  */
449 static __devinit void wm831x_buckv_dvs_init(struct wm831x_dcdc *dcdc,
450                                             struct wm831x_buckv_pdata *pdata)
451 {
452         struct wm831x *wm831x = dcdc->wm831x;
453         int ret;
454         u16 ctrl;
455
456         if (!pdata || !pdata->dvs_gpio)
457                 return;
458
459         switch (pdata->dvs_control_src) {
460         case 1:
461                 ctrl = 2 << WM831X_DC1_DVS_SRC_SHIFT;
462                 break;
463         case 2:
464                 ctrl = 3 << WM831X_DC1_DVS_SRC_SHIFT;
465                 break;
466         default:
467                 dev_err(wm831x->dev, "Invalid DVS control source %d for %s\n",
468                         pdata->dvs_control_src, dcdc->name);
469                 return;
470         }
471
472         ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL,
473                               WM831X_DC1_DVS_SRC_MASK, ctrl);
474         if (ret < 0) {
475                 dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n",
476                         dcdc->name, ret);
477                 return;
478         }
479
480         ret = gpio_request(pdata->dvs_gpio, "DCDC DVS");
481         if (ret < 0) {
482                 dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %d\n",
483                         dcdc->name, ret);
484                 return;
485         }
486
487         /* gpiolib won't let us read the GPIO status so pick the higher
488          * of the two existing voltages so we take it as platform data.
489          */
490         dcdc->dvs_gpio_state = pdata->dvs_init_state;
491
492         ret = gpio_direction_output(pdata->dvs_gpio, dcdc->dvs_gpio_state);
493         if (ret < 0) {
494                 dev_err(wm831x->dev, "Failed to enable %s DVS GPIO: %d\n",
495                         dcdc->name, ret);
496                 gpio_free(pdata->dvs_gpio);
497                 return;
498         }
499
500         dcdc->dvs_gpio = pdata->dvs_gpio;
501 }
502
503 static __devinit int wm831x_buckv_probe(struct platform_device *pdev)
504 {
505         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
506         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
507         int id;
508         struct wm831x_dcdc *dcdc;
509         struct resource *res;
510         int ret, irq;
511
512         if (pdata && pdata->wm831x_num)
513                 id = (pdata->wm831x_num * 10) + 1;
514         else
515                 id = 0;
516         id = pdev->id - id;
517
518         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
519
520         if (pdata == NULL || pdata->dcdc[id] == NULL)
521                 return -ENODEV;
522
523         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
524         if (dcdc == NULL) {
525                 dev_err(&pdev->dev, "Unable to allocate private data\n");
526                 return -ENOMEM;
527         }
528
529         dcdc->wm831x = wm831x;
530
531         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
532         if (res == NULL) {
533                 dev_err(&pdev->dev, "No I/O resource\n");
534                 ret = -EINVAL;
535                 goto err;
536         }
537         dcdc->base = res->start;
538
539         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
540         dcdc->desc.name = dcdc->name;
541         dcdc->desc.id = id;
542         dcdc->desc.type = REGULATOR_VOLTAGE;
543         dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1;
544         dcdc->desc.ops = &wm831x_buckv_ops;
545         dcdc->desc.owner = THIS_MODULE;
546
547         ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG);
548         if (ret < 0) {
549                 dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret);
550                 goto err;
551         }
552         dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK;
553
554         ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL);
555         if (ret < 0) {
556                 dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret);
557                 goto err;
558         }
559         dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK;
560
561         if (pdata->dcdc[id])
562                 wm831x_buckv_dvs_init(dcdc, pdata->dcdc[id]->driver_data);
563
564         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
565                                              pdata->dcdc[id], dcdc);
566         if (IS_ERR(dcdc->regulator)) {
567                 ret = PTR_ERR(dcdc->regulator);
568                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
569                         id + 1, ret);
570                 goto err;
571         }
572
573         irq = platform_get_irq_byname(pdev, "UV");
574         ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
575                                    IRQF_TRIGGER_RISING, dcdc->name, dcdc);
576         if (ret != 0) {
577                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
578                         irq, ret);
579                 goto err_regulator;
580         }
581
582         irq = platform_get_irq_byname(pdev, "HC");
583         ret = request_threaded_irq(irq, NULL, wm831x_dcdc_oc_irq,
584                                    IRQF_TRIGGER_RISING, dcdc->name, dcdc);
585         if (ret != 0) {
586                 dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n",
587                         irq, ret);
588                 goto err_uv;
589         }
590
591         platform_set_drvdata(pdev, dcdc);
592
593         return 0;
594
595 err_uv:
596         free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
597 err_regulator:
598         regulator_unregister(dcdc->regulator);
599 err:
600         if (dcdc->dvs_gpio)
601                 gpio_free(dcdc->dvs_gpio);
602         kfree(dcdc);
603         return ret;
604 }
605
606 static __devexit int wm831x_buckv_remove(struct platform_device *pdev)
607 {
608         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
609
610         platform_set_drvdata(pdev, NULL);
611
612         free_irq(platform_get_irq_byname(pdev, "HC"), dcdc);
613         free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
614         regulator_unregister(dcdc->regulator);
615         if (dcdc->dvs_gpio)
616                 gpio_free(dcdc->dvs_gpio);
617         kfree(dcdc);
618
619         return 0;
620 }
621
622 static struct platform_driver wm831x_buckv_driver = {
623         .probe = wm831x_buckv_probe,
624         .remove = __devexit_p(wm831x_buckv_remove),
625         .driver         = {
626                 .name   = "wm831x-buckv",
627                 .owner  = THIS_MODULE,
628         },
629 };
630
631 /*
632  * BUCKP specifics
633  */
634
635 static int wm831x_buckp_list_voltage(struct regulator_dev *rdev,
636                                       unsigned selector)
637 {
638         if (selector <= WM831X_BUCKP_MAX_SELECTOR)
639                 return 850000 + (selector * 25000);
640         else
641                 return -EINVAL;
642 }
643
644 static int wm831x_buckp_set_voltage_int(struct regulator_dev *rdev, int reg,
645                                         int min_uV, int max_uV, int *selector)
646 {
647         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
648         struct wm831x *wm831x = dcdc->wm831x;
649         u16 vsel;
650
651         if (min_uV <= 34000000)
652                 vsel = (min_uV - 850000) / 25000;
653         else
654                 return -EINVAL;
655
656         if (wm831x_buckp_list_voltage(rdev, vsel) > max_uV)
657                 return -EINVAL;
658
659         *selector = vsel;
660
661         return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, vsel);
662 }
663
664 static int wm831x_buckp_set_voltage(struct regulator_dev *rdev,
665                                     int min_uV, int max_uV,
666                                     unsigned *selector)
667 {
668         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
669         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
670
671         return wm831x_buckp_set_voltage_int(rdev, reg, min_uV, max_uV,
672                                             selector);
673 }
674
675 static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev,
676                                             int uV)
677 {
678         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
679         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
680         unsigned selector;
681
682         return wm831x_buckp_set_voltage_int(rdev, reg, uV, uV, &selector);
683 }
684
685 static int wm831x_buckp_get_voltage_sel(struct regulator_dev *rdev)
686 {
687         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
688         struct wm831x *wm831x = dcdc->wm831x;
689         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
690         int val;
691
692         val = wm831x_reg_read(wm831x, reg);
693         if (val < 0)
694                 return val;
695
696         return val & WM831X_DC3_ON_VSEL_MASK;
697 }
698
699 static struct regulator_ops wm831x_buckp_ops = {
700         .set_voltage = wm831x_buckp_set_voltage,
701         .get_voltage_sel = wm831x_buckp_get_voltage_sel,
702         .list_voltage = wm831x_buckp_list_voltage,
703         .set_suspend_voltage = wm831x_buckp_set_suspend_voltage,
704
705         .is_enabled = wm831x_dcdc_is_enabled,
706         .enable = wm831x_dcdc_enable,
707         .disable = wm831x_dcdc_disable,
708         .get_status = wm831x_dcdc_get_status,
709         .get_mode = wm831x_dcdc_get_mode,
710         .set_mode = wm831x_dcdc_set_mode,
711         .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
712 };
713
714 static __devinit int wm831x_buckp_probe(struct platform_device *pdev)
715 {
716         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
717         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
718         int id;
719         struct wm831x_dcdc *dcdc;
720         struct resource *res;
721         int ret, irq;
722
723         if (pdata && pdata->wm831x_num)
724                 id = (pdata->wm831x_num * 10) + 1;
725         else
726                 id = 0;
727         id = pdev->id - id;
728
729         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
730
731         if (pdata == NULL || pdata->dcdc[id] == NULL)
732                 return -ENODEV;
733
734         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
735         if (dcdc == NULL) {
736                 dev_err(&pdev->dev, "Unable to allocate private data\n");
737                 return -ENOMEM;
738         }
739
740         dcdc->wm831x = wm831x;
741
742         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
743         if (res == NULL) {
744                 dev_err(&pdev->dev, "No I/O resource\n");
745                 ret = -EINVAL;
746                 goto err;
747         }
748         dcdc->base = res->start;
749
750         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
751         dcdc->desc.name = dcdc->name;
752         dcdc->desc.id = id;
753         dcdc->desc.type = REGULATOR_VOLTAGE;
754         dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1;
755         dcdc->desc.ops = &wm831x_buckp_ops;
756         dcdc->desc.owner = THIS_MODULE;
757
758         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
759                                              pdata->dcdc[id], dcdc);
760         if (IS_ERR(dcdc->regulator)) {
761                 ret = PTR_ERR(dcdc->regulator);
762                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
763                         id + 1, ret);
764                 goto err;
765         }
766
767         irq = platform_get_irq_byname(pdev, "UV");
768         ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
769                                    IRQF_TRIGGER_RISING, dcdc->name, dcdc);
770         if (ret != 0) {
771                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
772                         irq, ret);
773                 goto err_regulator;
774         }
775
776         platform_set_drvdata(pdev, dcdc);
777
778         return 0;
779
780 err_regulator:
781         regulator_unregister(dcdc->regulator);
782 err:
783         kfree(dcdc);
784         return ret;
785 }
786
787 static __devexit int wm831x_buckp_remove(struct platform_device *pdev)
788 {
789         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
790
791         platform_set_drvdata(pdev, NULL);
792
793         free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
794         regulator_unregister(dcdc->regulator);
795         kfree(dcdc);
796
797         return 0;
798 }
799
800 static struct platform_driver wm831x_buckp_driver = {
801         .probe = wm831x_buckp_probe,
802         .remove = __devexit_p(wm831x_buckp_remove),
803         .driver         = {
804                 .name   = "wm831x-buckp",
805                 .owner  = THIS_MODULE,
806         },
807 };
808
809 /*
810  * DCDC boost convertors
811  */
812
813 static int wm831x_boostp_get_status(struct regulator_dev *rdev)
814 {
815         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
816         struct wm831x *wm831x = dcdc->wm831x;
817         int ret;
818
819         /* First, check for errors */
820         ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
821         if (ret < 0)
822                 return ret;
823
824         if (ret & (1 << rdev_get_id(rdev))) {
825                 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
826                         rdev_get_id(rdev) + 1);
827                 return REGULATOR_STATUS_ERROR;
828         }
829
830         /* Is the regulator on? */
831         ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
832         if (ret < 0)
833                 return ret;
834         if (ret & (1 << rdev_get_id(rdev)))
835                 return REGULATOR_STATUS_ON;
836         else
837                 return REGULATOR_STATUS_OFF;
838 }
839
840 static struct regulator_ops wm831x_boostp_ops = {
841         .get_status = wm831x_boostp_get_status,
842
843         .is_enabled = wm831x_dcdc_is_enabled,
844         .enable = wm831x_dcdc_enable,
845         .disable = wm831x_dcdc_disable,
846 };
847
848 static __devinit int wm831x_boostp_probe(struct platform_device *pdev)
849 {
850         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
851         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
852         int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
853         struct wm831x_dcdc *dcdc;
854         struct resource *res;
855         int ret, irq;
856
857         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
858
859         if (pdata == NULL || pdata->dcdc[id] == NULL)
860                 return -ENODEV;
861
862         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
863         if (dcdc == NULL) {
864                 dev_err(&pdev->dev, "Unable to allocate private data\n");
865                 return -ENOMEM;
866         }
867
868         dcdc->wm831x = wm831x;
869
870         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
871         if (res == NULL) {
872                 dev_err(&pdev->dev, "No I/O resource\n");
873                 ret = -EINVAL;
874                 goto err;
875         }
876         dcdc->base = res->start;
877
878         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
879         dcdc->desc.name = dcdc->name;
880         dcdc->desc.id = id;
881         dcdc->desc.type = REGULATOR_VOLTAGE;
882         dcdc->desc.ops = &wm831x_boostp_ops;
883         dcdc->desc.owner = THIS_MODULE;
884
885         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
886                                              pdata->dcdc[id], dcdc);
887         if (IS_ERR(dcdc->regulator)) {
888                 ret = PTR_ERR(dcdc->regulator);
889                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
890                         id + 1, ret);
891                 goto err;
892         }
893
894         irq = platform_get_irq_byname(pdev, "UV");
895         ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
896                                    IRQF_TRIGGER_RISING, dcdc->name,
897                                    dcdc);
898         if (ret != 0) {
899                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
900                         irq, ret);
901                 goto err_regulator;
902         }
903
904         platform_set_drvdata(pdev, dcdc);
905
906         return 0;
907
908 err_regulator:
909         regulator_unregister(dcdc->regulator);
910 err:
911         kfree(dcdc);
912         return ret;
913 }
914
915 static __devexit int wm831x_boostp_remove(struct platform_device *pdev)
916 {
917         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
918
919         platform_set_drvdata(pdev, NULL);
920
921         free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
922         regulator_unregister(dcdc->regulator);
923         kfree(dcdc);
924
925         return 0;
926 }
927
928 static struct platform_driver wm831x_boostp_driver = {
929         .probe = wm831x_boostp_probe,
930         .remove = __devexit_p(wm831x_boostp_remove),
931         .driver         = {
932                 .name   = "wm831x-boostp",
933                 .owner  = THIS_MODULE,
934         },
935 };
936
937 /*
938  * External Power Enable
939  *
940  * These aren't actually DCDCs but look like them in hardware so share
941  * code.
942  */
943
944 #define WM831X_EPE_BASE 6
945
946 static struct regulator_ops wm831x_epe_ops = {
947         .is_enabled = wm831x_dcdc_is_enabled,
948         .enable = wm831x_dcdc_enable,
949         .disable = wm831x_dcdc_disable,
950         .get_status = wm831x_dcdc_get_status,
951 };
952
953 static __devinit int wm831x_epe_probe(struct platform_device *pdev)
954 {
955         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
956         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
957         int id = pdev->id % ARRAY_SIZE(pdata->epe);
958         struct wm831x_dcdc *dcdc;
959         int ret;
960
961         dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1);
962
963         if (pdata == NULL || pdata->epe[id] == NULL)
964                 return -ENODEV;
965
966         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
967         if (dcdc == NULL) {
968                 dev_err(&pdev->dev, "Unable to allocate private data\n");
969                 return -ENOMEM;
970         }
971
972         dcdc->wm831x = wm831x;
973
974         /* For current parts this is correct; probably need to revisit
975          * in future.
976          */
977         snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1);
978         dcdc->desc.name = dcdc->name;
979         dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */
980         dcdc->desc.ops = &wm831x_epe_ops;
981         dcdc->desc.type = REGULATOR_VOLTAGE;
982         dcdc->desc.owner = THIS_MODULE;
983
984         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
985                                              pdata->epe[id], dcdc);
986         if (IS_ERR(dcdc->regulator)) {
987                 ret = PTR_ERR(dcdc->regulator);
988                 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n",
989                         id + 1, ret);
990                 goto err;
991         }
992
993         platform_set_drvdata(pdev, dcdc);
994
995         return 0;
996
997 err:
998         kfree(dcdc);
999         return ret;
1000 }
1001
1002 static __devexit int wm831x_epe_remove(struct platform_device *pdev)
1003 {
1004         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
1005
1006         platform_set_drvdata(pdev, NULL);
1007
1008         regulator_unregister(dcdc->regulator);
1009         kfree(dcdc);
1010
1011         return 0;
1012 }
1013
1014 static struct platform_driver wm831x_epe_driver = {
1015         .probe = wm831x_epe_probe,
1016         .remove = __devexit_p(wm831x_epe_remove),
1017         .driver         = {
1018                 .name   = "wm831x-epe",
1019                 .owner  = THIS_MODULE,
1020         },
1021 };
1022
1023 static int __init wm831x_dcdc_init(void)
1024 {
1025         int ret;
1026         ret = platform_driver_register(&wm831x_buckv_driver);
1027         if (ret != 0)
1028                 pr_err("Failed to register WM831x BUCKV driver: %d\n", ret);
1029
1030         ret = platform_driver_register(&wm831x_buckp_driver);
1031         if (ret != 0)
1032                 pr_err("Failed to register WM831x BUCKP driver: %d\n", ret);
1033
1034         ret = platform_driver_register(&wm831x_boostp_driver);
1035         if (ret != 0)
1036                 pr_err("Failed to register WM831x BOOST driver: %d\n", ret);
1037
1038         ret = platform_driver_register(&wm831x_epe_driver);
1039         if (ret != 0)
1040                 pr_err("Failed to register WM831x EPE driver: %d\n", ret);
1041
1042         return 0;
1043 }
1044 subsys_initcall(wm831x_dcdc_init);
1045
1046 static void __exit wm831x_dcdc_exit(void)
1047 {
1048         platform_driver_unregister(&wm831x_epe_driver);
1049         platform_driver_unregister(&wm831x_boostp_driver);
1050         platform_driver_unregister(&wm831x_buckp_driver);
1051         platform_driver_unregister(&wm831x_buckv_driver);
1052 }
1053 module_exit(wm831x_dcdc_exit);
1054
1055 /* Module information */
1056 MODULE_AUTHOR("Mark Brown");
1057 MODULE_DESCRIPTION("WM831x DC-DC convertor driver");
1058 MODULE_LICENSE("GPL");
1059 MODULE_ALIAS("platform:wm831x-buckv");
1060 MODULE_ALIAS("platform:wm831x-buckp");
1061 MODULE_ALIAS("platform:wm831x-epe");