regulator: Fix warning with CONFIG_BUG disabled
[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 = pdev->id % ARRAY_SIZE(pdata->dcdc);
508         struct wm831x_dcdc *dcdc;
509         struct resource *res;
510         int ret, irq;
511
512         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
513
514         if (pdata == NULL || pdata->dcdc[id] == NULL)
515                 return -ENODEV;
516
517         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
518         if (dcdc == NULL) {
519                 dev_err(&pdev->dev, "Unable to allocate private data\n");
520                 return -ENOMEM;
521         }
522
523         dcdc->wm831x = wm831x;
524
525         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
526         if (res == NULL) {
527                 dev_err(&pdev->dev, "No I/O resource\n");
528                 ret = -EINVAL;
529                 goto err;
530         }
531         dcdc->base = res->start;
532
533         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
534         dcdc->desc.name = dcdc->name;
535         dcdc->desc.id = id;
536         dcdc->desc.type = REGULATOR_VOLTAGE;
537         dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1;
538         dcdc->desc.ops = &wm831x_buckv_ops;
539         dcdc->desc.owner = THIS_MODULE;
540
541         ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG);
542         if (ret < 0) {
543                 dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret);
544                 goto err;
545         }
546         dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK;
547
548         ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG);
549         if (ret < 0) {
550                 dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret);
551                 goto err;
552         }
553         dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK;
554
555         if (pdata->dcdc[id])
556                 wm831x_buckv_dvs_init(dcdc, pdata->dcdc[id]->driver_data);
557
558         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
559                                              pdata->dcdc[id], dcdc);
560         if (IS_ERR(dcdc->regulator)) {
561                 ret = PTR_ERR(dcdc->regulator);
562                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
563                         id + 1, ret);
564                 goto err;
565         }
566
567         irq = platform_get_irq_byname(pdev, "UV");
568         ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_uv_irq,
569                                  IRQF_TRIGGER_RISING, dcdc->name,
570                                  dcdc);
571         if (ret != 0) {
572                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
573                         irq, ret);
574                 goto err_regulator;
575         }
576
577         irq = platform_get_irq_byname(pdev, "HC");
578         ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_oc_irq,
579                                  IRQF_TRIGGER_RISING, dcdc->name,
580                                  dcdc);
581         if (ret != 0) {
582                 dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n",
583                         irq, ret);
584                 goto err_uv;
585         }
586
587         platform_set_drvdata(pdev, dcdc);
588
589         return 0;
590
591 err_uv:
592         wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc);
593 err_regulator:
594         regulator_unregister(dcdc->regulator);
595 err:
596         if (dcdc->dvs_gpio)
597                 gpio_free(dcdc->dvs_gpio);
598         kfree(dcdc);
599         return ret;
600 }
601
602 static __devexit int wm831x_buckv_remove(struct platform_device *pdev)
603 {
604         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
605         struct wm831x *wm831x = dcdc->wm831x;
606
607         platform_set_drvdata(pdev, NULL);
608
609         wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "HC"), dcdc);
610         wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc);
611         regulator_unregister(dcdc->regulator);
612         if (dcdc->dvs_gpio)
613                 gpio_free(dcdc->dvs_gpio);
614         kfree(dcdc);
615
616         return 0;
617 }
618
619 static struct platform_driver wm831x_buckv_driver = {
620         .probe = wm831x_buckv_probe,
621         .remove = __devexit_p(wm831x_buckv_remove),
622         .driver         = {
623                 .name   = "wm831x-buckv",
624                 .owner  = THIS_MODULE,
625         },
626 };
627
628 /*
629  * BUCKP specifics
630  */
631
632 static int wm831x_buckp_list_voltage(struct regulator_dev *rdev,
633                                       unsigned selector)
634 {
635         if (selector <= WM831X_BUCKP_MAX_SELECTOR)
636                 return 850000 + (selector * 25000);
637         else
638                 return -EINVAL;
639 }
640
641 static int wm831x_buckp_set_voltage_int(struct regulator_dev *rdev, int reg,
642                                         int min_uV, int max_uV, int *selector)
643 {
644         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
645         struct wm831x *wm831x = dcdc->wm831x;
646         u16 vsel;
647
648         if (min_uV <= 34000000)
649                 vsel = (min_uV - 850000) / 25000;
650         else
651                 return -EINVAL;
652
653         if (wm831x_buckp_list_voltage(rdev, vsel) > max_uV)
654                 return -EINVAL;
655
656         *selector = vsel;
657
658         return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, vsel);
659 }
660
661 static int wm831x_buckp_set_voltage(struct regulator_dev *rdev,
662                                     int min_uV, int max_uV,
663                                     unsigned *selector)
664 {
665         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
666         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
667
668         return wm831x_buckp_set_voltage_int(rdev, reg, min_uV, max_uV,
669                                             selector);
670 }
671
672 static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev,
673                                             int uV)
674 {
675         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
676         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
677         unsigned selector;
678
679         return wm831x_buckp_set_voltage_int(rdev, reg, uV, uV, &selector);
680 }
681
682 static int wm831x_buckp_get_voltage_sel(struct regulator_dev *rdev)
683 {
684         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
685         struct wm831x *wm831x = dcdc->wm831x;
686         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
687         int val;
688
689         val = wm831x_reg_read(wm831x, reg);
690         if (val < 0)
691                 return val;
692
693         return val & WM831X_DC3_ON_VSEL_MASK;
694 }
695
696 static struct regulator_ops wm831x_buckp_ops = {
697         .set_voltage = wm831x_buckp_set_voltage,
698         .get_voltage_sel = wm831x_buckp_get_voltage_sel,
699         .list_voltage = wm831x_buckp_list_voltage,
700         .set_suspend_voltage = wm831x_buckp_set_suspend_voltage,
701
702         .is_enabled = wm831x_dcdc_is_enabled,
703         .enable = wm831x_dcdc_enable,
704         .disable = wm831x_dcdc_disable,
705         .get_status = wm831x_dcdc_get_status,
706         .get_mode = wm831x_dcdc_get_mode,
707         .set_mode = wm831x_dcdc_set_mode,
708         .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
709 };
710
711 static __devinit int wm831x_buckp_probe(struct platform_device *pdev)
712 {
713         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
714         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
715         int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
716         struct wm831x_dcdc *dcdc;
717         struct resource *res;
718         int ret, irq;
719
720         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
721
722         if (pdata == NULL || pdata->dcdc[id] == NULL)
723                 return -ENODEV;
724
725         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
726         if (dcdc == NULL) {
727                 dev_err(&pdev->dev, "Unable to allocate private data\n");
728                 return -ENOMEM;
729         }
730
731         dcdc->wm831x = wm831x;
732
733         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
734         if (res == NULL) {
735                 dev_err(&pdev->dev, "No I/O resource\n");
736                 ret = -EINVAL;
737                 goto err;
738         }
739         dcdc->base = res->start;
740
741         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
742         dcdc->desc.name = dcdc->name;
743         dcdc->desc.id = id;
744         dcdc->desc.type = REGULATOR_VOLTAGE;
745         dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1;
746         dcdc->desc.ops = &wm831x_buckp_ops;
747         dcdc->desc.owner = THIS_MODULE;
748
749         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
750                                              pdata->dcdc[id], dcdc);
751         if (IS_ERR(dcdc->regulator)) {
752                 ret = PTR_ERR(dcdc->regulator);
753                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
754                         id + 1, ret);
755                 goto err;
756         }
757
758         irq = platform_get_irq_byname(pdev, "UV");
759         ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_uv_irq,
760                                  IRQF_TRIGGER_RISING, dcdc->name,
761                                  dcdc);
762         if (ret != 0) {
763                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
764                         irq, ret);
765                 goto err_regulator;
766         }
767
768         platform_set_drvdata(pdev, dcdc);
769
770         return 0;
771
772 err_regulator:
773         regulator_unregister(dcdc->regulator);
774 err:
775         kfree(dcdc);
776         return ret;
777 }
778
779 static __devexit int wm831x_buckp_remove(struct platform_device *pdev)
780 {
781         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
782         struct wm831x *wm831x = dcdc->wm831x;
783
784         platform_set_drvdata(pdev, NULL);
785
786         wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc);
787         regulator_unregister(dcdc->regulator);
788         kfree(dcdc);
789
790         return 0;
791 }
792
793 static struct platform_driver wm831x_buckp_driver = {
794         .probe = wm831x_buckp_probe,
795         .remove = __devexit_p(wm831x_buckp_remove),
796         .driver         = {
797                 .name   = "wm831x-buckp",
798                 .owner  = THIS_MODULE,
799         },
800 };
801
802 /*
803  * DCDC boost convertors
804  */
805
806 static int wm831x_boostp_get_status(struct regulator_dev *rdev)
807 {
808         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
809         struct wm831x *wm831x = dcdc->wm831x;
810         int ret;
811
812         /* First, check for errors */
813         ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
814         if (ret < 0)
815                 return ret;
816
817         if (ret & (1 << rdev_get_id(rdev))) {
818                 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
819                         rdev_get_id(rdev) + 1);
820                 return REGULATOR_STATUS_ERROR;
821         }
822
823         /* Is the regulator on? */
824         ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
825         if (ret < 0)
826                 return ret;
827         if (ret & (1 << rdev_get_id(rdev)))
828                 return REGULATOR_STATUS_ON;
829         else
830                 return REGULATOR_STATUS_OFF;
831 }
832
833 static struct regulator_ops wm831x_boostp_ops = {
834         .get_status = wm831x_boostp_get_status,
835
836         .is_enabled = wm831x_dcdc_is_enabled,
837         .enable = wm831x_dcdc_enable,
838         .disable = wm831x_dcdc_disable,
839 };
840
841 static __devinit int wm831x_boostp_probe(struct platform_device *pdev)
842 {
843         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
844         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
845         int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
846         struct wm831x_dcdc *dcdc;
847         struct resource *res;
848         int ret, irq;
849
850         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
851
852         if (pdata == NULL || pdata->dcdc[id] == NULL)
853                 return -ENODEV;
854
855         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
856         if (dcdc == NULL) {
857                 dev_err(&pdev->dev, "Unable to allocate private data\n");
858                 return -ENOMEM;
859         }
860
861         dcdc->wm831x = wm831x;
862
863         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
864         if (res == NULL) {
865                 dev_err(&pdev->dev, "No I/O resource\n");
866                 ret = -EINVAL;
867                 goto err;
868         }
869         dcdc->base = res->start;
870
871         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
872         dcdc->desc.name = dcdc->name;
873         dcdc->desc.id = id;
874         dcdc->desc.type = REGULATOR_VOLTAGE;
875         dcdc->desc.ops = &wm831x_boostp_ops;
876         dcdc->desc.owner = THIS_MODULE;
877
878         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
879                                              pdata->dcdc[id], dcdc);
880         if (IS_ERR(dcdc->regulator)) {
881                 ret = PTR_ERR(dcdc->regulator);
882                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
883                         id + 1, ret);
884                 goto err;
885         }
886
887         irq = platform_get_irq_byname(pdev, "UV");
888         ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_uv_irq,
889                                  IRQF_TRIGGER_RISING, dcdc->name,
890                                  dcdc);
891         if (ret != 0) {
892                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
893                         irq, ret);
894                 goto err_regulator;
895         }
896
897         platform_set_drvdata(pdev, dcdc);
898
899         return 0;
900
901 err_regulator:
902         regulator_unregister(dcdc->regulator);
903 err:
904         kfree(dcdc);
905         return ret;
906 }
907
908 static __devexit int wm831x_boostp_remove(struct platform_device *pdev)
909 {
910         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
911         struct wm831x *wm831x = dcdc->wm831x;
912
913         platform_set_drvdata(pdev, NULL);
914
915         wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc);
916         regulator_unregister(dcdc->regulator);
917         kfree(dcdc);
918
919         return 0;
920 }
921
922 static struct platform_driver wm831x_boostp_driver = {
923         .probe = wm831x_boostp_probe,
924         .remove = __devexit_p(wm831x_boostp_remove),
925         .driver         = {
926                 .name   = "wm831x-boostp",
927                 .owner  = THIS_MODULE,
928         },
929 };
930
931 /*
932  * External Power Enable
933  *
934  * These aren't actually DCDCs but look like them in hardware so share
935  * code.
936  */
937
938 #define WM831X_EPE_BASE 6
939
940 static struct regulator_ops wm831x_epe_ops = {
941         .is_enabled = wm831x_dcdc_is_enabled,
942         .enable = wm831x_dcdc_enable,
943         .disable = wm831x_dcdc_disable,
944         .get_status = wm831x_dcdc_get_status,
945 };
946
947 static __devinit int wm831x_epe_probe(struct platform_device *pdev)
948 {
949         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
950         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
951         int id = pdev->id % ARRAY_SIZE(pdata->epe);
952         struct wm831x_dcdc *dcdc;
953         int ret;
954
955         dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1);
956
957         if (pdata == NULL || pdata->epe[id] == NULL)
958                 return -ENODEV;
959
960         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
961         if (dcdc == NULL) {
962                 dev_err(&pdev->dev, "Unable to allocate private data\n");
963                 return -ENOMEM;
964         }
965
966         dcdc->wm831x = wm831x;
967
968         /* For current parts this is correct; probably need to revisit
969          * in future.
970          */
971         snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1);
972         dcdc->desc.name = dcdc->name;
973         dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */
974         dcdc->desc.ops = &wm831x_epe_ops;
975         dcdc->desc.type = REGULATOR_VOLTAGE;
976         dcdc->desc.owner = THIS_MODULE;
977
978         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
979                                              pdata->epe[id], dcdc);
980         if (IS_ERR(dcdc->regulator)) {
981                 ret = PTR_ERR(dcdc->regulator);
982                 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n",
983                         id + 1, ret);
984                 goto err;
985         }
986
987         platform_set_drvdata(pdev, dcdc);
988
989         return 0;
990
991 err:
992         kfree(dcdc);
993         return ret;
994 }
995
996 static __devexit int wm831x_epe_remove(struct platform_device *pdev)
997 {
998         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
999
1000         platform_set_drvdata(pdev, NULL);
1001
1002         regulator_unregister(dcdc->regulator);
1003         kfree(dcdc);
1004
1005         return 0;
1006 }
1007
1008 static struct platform_driver wm831x_epe_driver = {
1009         .probe = wm831x_epe_probe,
1010         .remove = __devexit_p(wm831x_epe_remove),
1011         .driver         = {
1012                 .name   = "wm831x-epe",
1013                 .owner  = THIS_MODULE,
1014         },
1015 };
1016
1017 static int __init wm831x_dcdc_init(void)
1018 {
1019         int ret;
1020         ret = platform_driver_register(&wm831x_buckv_driver);
1021         if (ret != 0)
1022                 pr_err("Failed to register WM831x BUCKV driver: %d\n", ret);
1023
1024         ret = platform_driver_register(&wm831x_buckp_driver);
1025         if (ret != 0)
1026                 pr_err("Failed to register WM831x BUCKP driver: %d\n", ret);
1027
1028         ret = platform_driver_register(&wm831x_boostp_driver);
1029         if (ret != 0)
1030                 pr_err("Failed to register WM831x BOOST driver: %d\n", ret);
1031
1032         ret = platform_driver_register(&wm831x_epe_driver);
1033         if (ret != 0)
1034                 pr_err("Failed to register WM831x EPE driver: %d\n", ret);
1035
1036         return 0;
1037 }
1038 subsys_initcall(wm831x_dcdc_init);
1039
1040 static void __exit wm831x_dcdc_exit(void)
1041 {
1042         platform_driver_unregister(&wm831x_epe_driver);
1043         platform_driver_unregister(&wm831x_boostp_driver);
1044         platform_driver_unregister(&wm831x_buckp_driver);
1045         platform_driver_unregister(&wm831x_buckv_driver);
1046 }
1047 module_exit(wm831x_dcdc_exit);
1048
1049 /* Module information */
1050 MODULE_AUTHOR("Mark Brown");
1051 MODULE_DESCRIPTION("WM831x DC-DC convertor driver");
1052 MODULE_LICENSE("GPL");
1053 MODULE_ALIAS("platform:wm831x-buckv");
1054 MODULE_ALIAS("platform:wm831x-buckp");