perf: Do not export power_frequency, but power_start event
[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         }
124 }
125
126 static int wm831x_dcdc_set_mode_int(struct wm831x *wm831x, int reg,
127                                     unsigned int mode)
128 {
129         int val;
130
131         switch (mode) {
132         case REGULATOR_MODE_FAST:
133                 val = WM831X_DCDC_MODE_FAST;
134                 break;
135         case REGULATOR_MODE_NORMAL:
136                 val = WM831X_DCDC_MODE_NORMAL;
137                 break;
138         case REGULATOR_MODE_STANDBY:
139                 val = WM831X_DCDC_MODE_STANDBY;
140                 break;
141         case REGULATOR_MODE_IDLE:
142                 val = WM831X_DCDC_MODE_IDLE;
143                 break;
144         default:
145                 return -EINVAL;
146         }
147
148         return wm831x_set_bits(wm831x, reg, WM831X_DC1_ON_MODE_MASK,
149                                val << WM831X_DC1_ON_MODE_SHIFT);
150 }
151
152 static int wm831x_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode)
153 {
154         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
155         struct wm831x *wm831x = dcdc->wm831x;
156         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
157
158         return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
159 }
160
161 static int wm831x_dcdc_set_suspend_mode(struct regulator_dev *rdev,
162                                         unsigned int mode)
163 {
164         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
165         struct wm831x *wm831x = dcdc->wm831x;
166         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
167
168         return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
169 }
170
171 static int wm831x_dcdc_get_status(struct regulator_dev *rdev)
172 {
173         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
174         struct wm831x *wm831x = dcdc->wm831x;
175         int ret;
176
177         /* First, check for errors */
178         ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
179         if (ret < 0)
180                 return ret;
181
182         if (ret & (1 << rdev_get_id(rdev))) {
183                 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
184                         rdev_get_id(rdev) + 1);
185                 return REGULATOR_STATUS_ERROR;
186         }
187
188         /* DCDC1 and DCDC2 can additionally detect high voltage/current */
189         if (rdev_get_id(rdev) < 2) {
190                 if (ret & (WM831X_DC1_OV_STS << rdev_get_id(rdev))) {
191                         dev_dbg(wm831x->dev, "DCDC%d over voltage\n",
192                                 rdev_get_id(rdev) + 1);
193                         return REGULATOR_STATUS_ERROR;
194                 }
195
196                 if (ret & (WM831X_DC1_HC_STS << rdev_get_id(rdev))) {
197                         dev_dbg(wm831x->dev, "DCDC%d over current\n",
198                                 rdev_get_id(rdev) + 1);
199                         return REGULATOR_STATUS_ERROR;
200                 }
201         }
202
203         /* Is the regulator on? */
204         ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
205         if (ret < 0)
206                 return ret;
207         if (!(ret & (1 << rdev_get_id(rdev))))
208                 return REGULATOR_STATUS_OFF;
209
210         /* TODO: When we handle hardware control modes so we can report the
211          * current mode. */
212         return REGULATOR_STATUS_ON;
213 }
214
215 static irqreturn_t wm831x_dcdc_uv_irq(int irq, void *data)
216 {
217         struct wm831x_dcdc *dcdc = data;
218
219         regulator_notifier_call_chain(dcdc->regulator,
220                                       REGULATOR_EVENT_UNDER_VOLTAGE,
221                                       NULL);
222
223         return IRQ_HANDLED;
224 }
225
226 static irqreturn_t wm831x_dcdc_oc_irq(int irq, void *data)
227 {
228         struct wm831x_dcdc *dcdc = data;
229
230         regulator_notifier_call_chain(dcdc->regulator,
231                                       REGULATOR_EVENT_OVER_CURRENT,
232                                       NULL);
233
234         return IRQ_HANDLED;
235 }
236
237 /*
238  * BUCKV specifics
239  */
240
241 static int wm831x_buckv_list_voltage(struct regulator_dev *rdev,
242                                       unsigned selector)
243 {
244         if (selector <= 0x8)
245                 return 600000;
246         if (selector <= WM831X_BUCKV_MAX_SELECTOR)
247                 return 600000 + ((selector - 0x8) * 12500);
248         return -EINVAL;
249 }
250
251 static int wm831x_buckv_select_min_voltage(struct regulator_dev *rdev,
252                                            int min_uV, int max_uV)
253 {
254         u16 vsel;
255
256         if (min_uV < 600000)
257                 vsel = 0;
258         else if (min_uV <= 1800000)
259                 vsel = ((min_uV - 600000) / 12500) + 8;
260         else
261                 return -EINVAL;
262
263         if (wm831x_buckv_list_voltage(rdev, vsel) > max_uV)
264                 return -EINVAL;
265
266         return vsel;
267 }
268
269 static int wm831x_buckv_select_max_voltage(struct regulator_dev *rdev,
270                                            int min_uV, int max_uV)
271 {
272         u16 vsel;
273
274         if (max_uV < 600000 || max_uV > 1800000)
275                 return -EINVAL;
276
277         vsel = ((max_uV - 600000) / 12500) + 8;
278
279         if (wm831x_buckv_list_voltage(rdev, vsel) < min_uV ||
280             wm831x_buckv_list_voltage(rdev, vsel) < max_uV)
281                 return -EINVAL;
282
283         return vsel;
284 }
285
286 static int wm831x_buckv_set_dvs(struct regulator_dev *rdev, int state)
287 {
288         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
289
290         if (state == dcdc->dvs_gpio_state)
291                 return 0;
292
293         dcdc->dvs_gpio_state = state;
294         gpio_set_value(dcdc->dvs_gpio, state);
295
296         /* Should wait for DVS state change to be asserted if we have
297          * a GPIO for it, for now assume the device is configured
298          * for the fastest possible transition.
299          */
300
301         return 0;
302 }
303
304 static int wm831x_buckv_set_voltage(struct regulator_dev *rdev,
305                                     int min_uV, int max_uV)
306 {
307         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
308         struct wm831x *wm831x = dcdc->wm831x;
309         int on_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
310         int dvs_reg = dcdc->base + WM831X_DCDC_DVS_CONTROL;
311         int vsel, ret;
312
313         vsel = wm831x_buckv_select_min_voltage(rdev, min_uV, max_uV);
314         if (vsel < 0)
315                 return vsel;
316
317         /* If this value is already set then do a GPIO update if we can */
318         if (dcdc->dvs_gpio && dcdc->on_vsel == vsel)
319                 return wm831x_buckv_set_dvs(rdev, 0);
320
321         if (dcdc->dvs_gpio && dcdc->dvs_vsel == vsel)
322                 return wm831x_buckv_set_dvs(rdev, 1);
323
324         /* Always set the ON status to the minimum voltage */
325         ret = wm831x_set_bits(wm831x, on_reg, WM831X_DC1_ON_VSEL_MASK, vsel);
326         if (ret < 0)
327                 return ret;
328         dcdc->on_vsel = vsel;
329
330         if (!dcdc->dvs_gpio)
331                 return ret;
332
333         /* Kick the voltage transition now */
334         ret = wm831x_buckv_set_dvs(rdev, 0);
335         if (ret < 0)
336                 return ret;
337
338         /* Set the high voltage as the DVS voltage.  This is optimised
339          * for CPUfreq usage, most processors will keep the maximum
340          * voltage constant and lower the minimum with the frequency. */
341         vsel = wm831x_buckv_select_max_voltage(rdev, min_uV, max_uV);
342         if (vsel < 0) {
343                 /* This should never happen - at worst the same vsel
344                  * should be chosen */
345                 WARN_ON(vsel < 0);
346                 return 0;
347         }
348
349         /* Don't bother if it's the same VSEL we're already using */
350         if (vsel == dcdc->on_vsel)
351                 return 0;
352
353         ret = wm831x_set_bits(wm831x, dvs_reg, WM831X_DC1_DVS_VSEL_MASK, vsel);
354         if (ret == 0)
355                 dcdc->dvs_vsel = vsel;
356         else
357                 dev_warn(wm831x->dev, "Failed to set DCDC DVS VSEL: %d\n",
358                          ret);
359
360         return 0;
361 }
362
363 static int wm831x_buckv_set_suspend_voltage(struct regulator_dev *rdev,
364                                             int uV)
365 {
366         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
367         struct wm831x *wm831x = dcdc->wm831x;
368         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
369         int vsel;
370
371         vsel = wm831x_buckv_select_min_voltage(rdev, uV, uV);
372         if (vsel < 0)
373                 return vsel;
374
375         return wm831x_set_bits(wm831x, reg, WM831X_DC1_SLP_VSEL_MASK, vsel);
376 }
377
378 static int wm831x_buckv_get_voltage(struct regulator_dev *rdev)
379 {
380         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
381
382         if (dcdc->dvs_gpio && dcdc->dvs_gpio_state)
383                 return wm831x_buckv_list_voltage(rdev, dcdc->dvs_vsel);
384         else
385                 return wm831x_buckv_list_voltage(rdev, dcdc->on_vsel);
386 }
387
388 /* Current limit options */
389 static u16 wm831x_dcdc_ilim[] = {
390         125, 250, 375, 500, 625, 750, 875, 1000
391 };
392
393 static int wm831x_buckv_set_current_limit(struct regulator_dev *rdev,
394                                            int min_uA, int max_uA)
395 {
396         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
397         struct wm831x *wm831x = dcdc->wm831x;
398         u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
399         int i;
400
401         for (i = 0; i < ARRAY_SIZE(wm831x_dcdc_ilim); i++) {
402                 if (max_uA <= wm831x_dcdc_ilim[i])
403                         break;
404         }
405         if (i == ARRAY_SIZE(wm831x_dcdc_ilim))
406                 return -EINVAL;
407
408         return wm831x_set_bits(wm831x, reg, WM831X_DC1_HC_THR_MASK, i);
409 }
410
411 static int wm831x_buckv_get_current_limit(struct regulator_dev *rdev)
412 {
413         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
414         struct wm831x *wm831x = dcdc->wm831x;
415         u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
416         int val;
417
418         val = wm831x_reg_read(wm831x, reg);
419         if (val < 0)
420                 return val;
421
422         return wm831x_dcdc_ilim[val & WM831X_DC1_HC_THR_MASK];
423 }
424
425 static struct regulator_ops wm831x_buckv_ops = {
426         .set_voltage = wm831x_buckv_set_voltage,
427         .get_voltage = wm831x_buckv_get_voltage,
428         .list_voltage = wm831x_buckv_list_voltage,
429         .set_suspend_voltage = wm831x_buckv_set_suspend_voltage,
430         .set_current_limit = wm831x_buckv_set_current_limit,
431         .get_current_limit = wm831x_buckv_get_current_limit,
432
433         .is_enabled = wm831x_dcdc_is_enabled,
434         .enable = wm831x_dcdc_enable,
435         .disable = wm831x_dcdc_disable,
436         .get_status = wm831x_dcdc_get_status,
437         .get_mode = wm831x_dcdc_get_mode,
438         .set_mode = wm831x_dcdc_set_mode,
439         .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
440 };
441
442 /*
443  * Set up DVS control.  We just log errors since we can still run
444  * (with reduced performance) if we fail.
445  */
446 static __devinit void wm831x_buckv_dvs_init(struct wm831x_dcdc *dcdc,
447                                             struct wm831x_buckv_pdata *pdata)
448 {
449         struct wm831x *wm831x = dcdc->wm831x;
450         int ret;
451         u16 ctrl;
452
453         if (!pdata || !pdata->dvs_gpio)
454                 return;
455
456         switch (pdata->dvs_control_src) {
457         case 1:
458                 ctrl = 2 << WM831X_DC1_DVS_SRC_SHIFT;
459                 break;
460         case 2:
461                 ctrl = 3 << WM831X_DC1_DVS_SRC_SHIFT;
462                 break;
463         default:
464                 dev_err(wm831x->dev, "Invalid DVS control source %d for %s\n",
465                         pdata->dvs_control_src, dcdc->name);
466                 return;
467         }
468
469         ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL,
470                               WM831X_DC1_DVS_SRC_MASK, ctrl);
471         if (ret < 0) {
472                 dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n",
473                         dcdc->name, ret);
474                 return;
475         }
476
477         ret = gpio_request(pdata->dvs_gpio, "DCDC DVS");
478         if (ret < 0) {
479                 dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %d\n",
480                         dcdc->name, ret);
481                 return;
482         }
483
484         /* gpiolib won't let us read the GPIO status so pick the higher
485          * of the two existing voltages so we take it as platform data.
486          */
487         dcdc->dvs_gpio_state = pdata->dvs_init_state;
488
489         ret = gpio_direction_output(pdata->dvs_gpio, dcdc->dvs_gpio_state);
490         if (ret < 0) {
491                 dev_err(wm831x->dev, "Failed to enable %s DVS GPIO: %d\n",
492                         dcdc->name, ret);
493                 gpio_free(pdata->dvs_gpio);
494                 return;
495         }
496
497         dcdc->dvs_gpio = pdata->dvs_gpio;
498 }
499
500 static __devinit int wm831x_buckv_probe(struct platform_device *pdev)
501 {
502         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
503         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
504         int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
505         struct wm831x_dcdc *dcdc;
506         struct resource *res;
507         int ret, irq;
508
509         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
510
511         if (pdata == NULL || pdata->dcdc[id] == NULL)
512                 return -ENODEV;
513
514         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
515         if (dcdc == NULL) {
516                 dev_err(&pdev->dev, "Unable to allocate private data\n");
517                 return -ENOMEM;
518         }
519
520         dcdc->wm831x = wm831x;
521
522         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
523         if (res == NULL) {
524                 dev_err(&pdev->dev, "No I/O resource\n");
525                 ret = -EINVAL;
526                 goto err;
527         }
528         dcdc->base = res->start;
529
530         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
531         dcdc->desc.name = dcdc->name;
532         dcdc->desc.id = id;
533         dcdc->desc.type = REGULATOR_VOLTAGE;
534         dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1;
535         dcdc->desc.ops = &wm831x_buckv_ops;
536         dcdc->desc.owner = THIS_MODULE;
537
538         ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG);
539         if (ret < 0) {
540                 dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret);
541                 goto err;
542         }
543         dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK;
544
545         ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG);
546         if (ret < 0) {
547                 dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret);
548                 goto err;
549         }
550         dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK;
551
552         if (pdata->dcdc[id])
553                 wm831x_buckv_dvs_init(dcdc, pdata->dcdc[id]->driver_data);
554
555         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
556                                              pdata->dcdc[id], dcdc);
557         if (IS_ERR(dcdc->regulator)) {
558                 ret = PTR_ERR(dcdc->regulator);
559                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
560                         id + 1, ret);
561                 goto err;
562         }
563
564         irq = platform_get_irq_byname(pdev, "UV");
565         ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_uv_irq,
566                                  IRQF_TRIGGER_RISING, dcdc->name,
567                                  dcdc);
568         if (ret != 0) {
569                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
570                         irq, ret);
571                 goto err_regulator;
572         }
573
574         irq = platform_get_irq_byname(pdev, "HC");
575         ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_oc_irq,
576                                  IRQF_TRIGGER_RISING, dcdc->name,
577                                  dcdc);
578         if (ret != 0) {
579                 dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n",
580                         irq, ret);
581                 goto err_uv;
582         }
583
584         platform_set_drvdata(pdev, dcdc);
585
586         return 0;
587
588 err_uv:
589         wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc);
590 err_regulator:
591         regulator_unregister(dcdc->regulator);
592 err:
593         if (dcdc->dvs_gpio)
594                 gpio_free(dcdc->dvs_gpio);
595         kfree(dcdc);
596         return ret;
597 }
598
599 static __devexit int wm831x_buckv_remove(struct platform_device *pdev)
600 {
601         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
602         struct wm831x *wm831x = dcdc->wm831x;
603
604         platform_set_drvdata(pdev, NULL);
605
606         wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "HC"), dcdc);
607         wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc);
608         regulator_unregister(dcdc->regulator);
609         if (dcdc->dvs_gpio)
610                 gpio_free(dcdc->dvs_gpio);
611         kfree(dcdc);
612
613         return 0;
614 }
615
616 static struct platform_driver wm831x_buckv_driver = {
617         .probe = wm831x_buckv_probe,
618         .remove = __devexit_p(wm831x_buckv_remove),
619         .driver         = {
620                 .name   = "wm831x-buckv",
621                 .owner  = THIS_MODULE,
622         },
623 };
624
625 /*
626  * BUCKP specifics
627  */
628
629 static int wm831x_buckp_list_voltage(struct regulator_dev *rdev,
630                                       unsigned selector)
631 {
632         if (selector <= WM831X_BUCKP_MAX_SELECTOR)
633                 return 850000 + (selector * 25000);
634         else
635                 return -EINVAL;
636 }
637
638 static int wm831x_buckp_set_voltage_int(struct regulator_dev *rdev, int reg,
639                                         int min_uV, int max_uV)
640 {
641         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
642         struct wm831x *wm831x = dcdc->wm831x;
643         u16 vsel;
644
645         if (min_uV <= 34000000)
646                 vsel = (min_uV - 850000) / 25000;
647         else
648                 return -EINVAL;
649
650         if (wm831x_buckp_list_voltage(rdev, vsel) > max_uV)
651                 return -EINVAL;
652
653         return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, vsel);
654 }
655
656 static int wm831x_buckp_set_voltage(struct regulator_dev *rdev,
657                                     int min_uV, int max_uV)
658 {
659         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
660         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
661
662         return wm831x_buckp_set_voltage_int(rdev, reg, min_uV, max_uV);
663 }
664
665 static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev,
666                                             int uV)
667 {
668         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
669         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
670
671         return wm831x_buckp_set_voltage_int(rdev, reg, uV, uV);
672 }
673
674 static int wm831x_buckp_get_voltage(struct regulator_dev *rdev)
675 {
676         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
677         struct wm831x *wm831x = dcdc->wm831x;
678         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
679         int val;
680
681         val = wm831x_reg_read(wm831x, reg);
682         if (val < 0)
683                 return val;
684
685         return wm831x_buckp_list_voltage(rdev, val & WM831X_DC3_ON_VSEL_MASK);
686 }
687
688 static struct regulator_ops wm831x_buckp_ops = {
689         .set_voltage = wm831x_buckp_set_voltage,
690         .get_voltage = wm831x_buckp_get_voltage,
691         .list_voltage = wm831x_buckp_list_voltage,
692         .set_suspend_voltage = wm831x_buckp_set_suspend_voltage,
693
694         .is_enabled = wm831x_dcdc_is_enabled,
695         .enable = wm831x_dcdc_enable,
696         .disable = wm831x_dcdc_disable,
697         .get_status = wm831x_dcdc_get_status,
698         .get_mode = wm831x_dcdc_get_mode,
699         .set_mode = wm831x_dcdc_set_mode,
700         .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
701 };
702
703 static __devinit int wm831x_buckp_probe(struct platform_device *pdev)
704 {
705         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
706         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
707         int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
708         struct wm831x_dcdc *dcdc;
709         struct resource *res;
710         int ret, irq;
711
712         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
713
714         if (pdata == NULL || pdata->dcdc[id] == NULL)
715                 return -ENODEV;
716
717         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
718         if (dcdc == NULL) {
719                 dev_err(&pdev->dev, "Unable to allocate private data\n");
720                 return -ENOMEM;
721         }
722
723         dcdc->wm831x = wm831x;
724
725         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
726         if (res == NULL) {
727                 dev_err(&pdev->dev, "No I/O resource\n");
728                 ret = -EINVAL;
729                 goto err;
730         }
731         dcdc->base = res->start;
732
733         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
734         dcdc->desc.name = dcdc->name;
735         dcdc->desc.id = id;
736         dcdc->desc.type = REGULATOR_VOLTAGE;
737         dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1;
738         dcdc->desc.ops = &wm831x_buckp_ops;
739         dcdc->desc.owner = THIS_MODULE;
740
741         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
742                                              pdata->dcdc[id], dcdc);
743         if (IS_ERR(dcdc->regulator)) {
744                 ret = PTR_ERR(dcdc->regulator);
745                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
746                         id + 1, ret);
747                 goto err;
748         }
749
750         irq = platform_get_irq_byname(pdev, "UV");
751         ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_uv_irq,
752                                  IRQF_TRIGGER_RISING, dcdc->name,
753                                  dcdc);
754         if (ret != 0) {
755                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
756                         irq, ret);
757                 goto err_regulator;
758         }
759
760         platform_set_drvdata(pdev, dcdc);
761
762         return 0;
763
764 err_regulator:
765         regulator_unregister(dcdc->regulator);
766 err:
767         kfree(dcdc);
768         return ret;
769 }
770
771 static __devexit int wm831x_buckp_remove(struct platform_device *pdev)
772 {
773         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
774         struct wm831x *wm831x = dcdc->wm831x;
775
776         platform_set_drvdata(pdev, NULL);
777
778         wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc);
779         regulator_unregister(dcdc->regulator);
780         kfree(dcdc);
781
782         return 0;
783 }
784
785 static struct platform_driver wm831x_buckp_driver = {
786         .probe = wm831x_buckp_probe,
787         .remove = __devexit_p(wm831x_buckp_remove),
788         .driver         = {
789                 .name   = "wm831x-buckp",
790                 .owner  = THIS_MODULE,
791         },
792 };
793
794 /*
795  * DCDC boost convertors
796  */
797
798 static int wm831x_boostp_get_status(struct regulator_dev *rdev)
799 {
800         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
801         struct wm831x *wm831x = dcdc->wm831x;
802         int ret;
803
804         /* First, check for errors */
805         ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
806         if (ret < 0)
807                 return ret;
808
809         if (ret & (1 << rdev_get_id(rdev))) {
810                 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
811                         rdev_get_id(rdev) + 1);
812                 return REGULATOR_STATUS_ERROR;
813         }
814
815         /* Is the regulator on? */
816         ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
817         if (ret < 0)
818                 return ret;
819         if (ret & (1 << rdev_get_id(rdev)))
820                 return REGULATOR_STATUS_ON;
821         else
822                 return REGULATOR_STATUS_OFF;
823 }
824
825 static struct regulator_ops wm831x_boostp_ops = {
826         .get_status = wm831x_boostp_get_status,
827
828         .is_enabled = wm831x_dcdc_is_enabled,
829         .enable = wm831x_dcdc_enable,
830         .disable = wm831x_dcdc_disable,
831 };
832
833 static __devinit int wm831x_boostp_probe(struct platform_device *pdev)
834 {
835         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
836         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
837         int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
838         struct wm831x_dcdc *dcdc;
839         struct resource *res;
840         int ret, irq;
841
842         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
843
844         if (pdata == NULL || pdata->dcdc[id] == NULL)
845                 return -ENODEV;
846
847         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
848         if (dcdc == NULL) {
849                 dev_err(&pdev->dev, "Unable to allocate private data\n");
850                 return -ENOMEM;
851         }
852
853         dcdc->wm831x = wm831x;
854
855         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
856         if (res == NULL) {
857                 dev_err(&pdev->dev, "No I/O resource\n");
858                 ret = -EINVAL;
859                 goto err;
860         }
861         dcdc->base = res->start;
862
863         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
864         dcdc->desc.name = dcdc->name;
865         dcdc->desc.id = id;
866         dcdc->desc.type = REGULATOR_VOLTAGE;
867         dcdc->desc.ops = &wm831x_boostp_ops;
868         dcdc->desc.owner = THIS_MODULE;
869
870         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
871                                              pdata->dcdc[id], dcdc);
872         if (IS_ERR(dcdc->regulator)) {
873                 ret = PTR_ERR(dcdc->regulator);
874                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
875                         id + 1, ret);
876                 goto err;
877         }
878
879         irq = platform_get_irq_byname(pdev, "UV");
880         ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_uv_irq,
881                                  IRQF_TRIGGER_RISING, dcdc->name,
882                                  dcdc);
883         if (ret != 0) {
884                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
885                         irq, ret);
886                 goto err_regulator;
887         }
888
889         platform_set_drvdata(pdev, dcdc);
890
891         return 0;
892
893 err_regulator:
894         regulator_unregister(dcdc->regulator);
895 err:
896         kfree(dcdc);
897         return ret;
898 }
899
900 static __devexit int wm831x_boostp_remove(struct platform_device *pdev)
901 {
902         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
903         struct wm831x *wm831x = dcdc->wm831x;
904
905         platform_set_drvdata(pdev, NULL);
906
907         wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc);
908         regulator_unregister(dcdc->regulator);
909         kfree(dcdc);
910
911         return 0;
912 }
913
914 static struct platform_driver wm831x_boostp_driver = {
915         .probe = wm831x_boostp_probe,
916         .remove = __devexit_p(wm831x_boostp_remove),
917         .driver         = {
918                 .name   = "wm831x-boostp",
919                 .owner  = THIS_MODULE,
920         },
921 };
922
923 /*
924  * External Power Enable
925  *
926  * These aren't actually DCDCs but look like them in hardware so share
927  * code.
928  */
929
930 #define WM831X_EPE_BASE 6
931
932 static struct regulator_ops wm831x_epe_ops = {
933         .is_enabled = wm831x_dcdc_is_enabled,
934         .enable = wm831x_dcdc_enable,
935         .disable = wm831x_dcdc_disable,
936         .get_status = wm831x_dcdc_get_status,
937 };
938
939 static __devinit int wm831x_epe_probe(struct platform_device *pdev)
940 {
941         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
942         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
943         int id = pdev->id % ARRAY_SIZE(pdata->epe);
944         struct wm831x_dcdc *dcdc;
945         int ret;
946
947         dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1);
948
949         if (pdata == NULL || pdata->epe[id] == NULL)
950                 return -ENODEV;
951
952         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
953         if (dcdc == NULL) {
954                 dev_err(&pdev->dev, "Unable to allocate private data\n");
955                 return -ENOMEM;
956         }
957
958         dcdc->wm831x = wm831x;
959
960         /* For current parts this is correct; probably need to revisit
961          * in future.
962          */
963         snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1);
964         dcdc->desc.name = dcdc->name;
965         dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */
966         dcdc->desc.ops = &wm831x_epe_ops;
967         dcdc->desc.type = REGULATOR_VOLTAGE;
968         dcdc->desc.owner = THIS_MODULE;
969
970         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
971                                              pdata->epe[id], dcdc);
972         if (IS_ERR(dcdc->regulator)) {
973                 ret = PTR_ERR(dcdc->regulator);
974                 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n",
975                         id + 1, ret);
976                 goto err;
977         }
978
979         platform_set_drvdata(pdev, dcdc);
980
981         return 0;
982
983 err:
984         kfree(dcdc);
985         return ret;
986 }
987
988 static __devexit int wm831x_epe_remove(struct platform_device *pdev)
989 {
990         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
991
992         platform_set_drvdata(pdev, NULL);
993
994         regulator_unregister(dcdc->regulator);
995         kfree(dcdc);
996
997         return 0;
998 }
999
1000 static struct platform_driver wm831x_epe_driver = {
1001         .probe = wm831x_epe_probe,
1002         .remove = __devexit_p(wm831x_epe_remove),
1003         .driver         = {
1004                 .name   = "wm831x-epe",
1005                 .owner  = THIS_MODULE,
1006         },
1007 };
1008
1009 static int __init wm831x_dcdc_init(void)
1010 {
1011         int ret;
1012         ret = platform_driver_register(&wm831x_buckv_driver);
1013         if (ret != 0)
1014                 pr_err("Failed to register WM831x BUCKV driver: %d\n", ret);
1015
1016         ret = platform_driver_register(&wm831x_buckp_driver);
1017         if (ret != 0)
1018                 pr_err("Failed to register WM831x BUCKP driver: %d\n", ret);
1019
1020         ret = platform_driver_register(&wm831x_boostp_driver);
1021         if (ret != 0)
1022                 pr_err("Failed to register WM831x BOOST driver: %d\n", ret);
1023
1024         ret = platform_driver_register(&wm831x_epe_driver);
1025         if (ret != 0)
1026                 pr_err("Failed to register WM831x EPE driver: %d\n", ret);
1027
1028         return 0;
1029 }
1030 subsys_initcall(wm831x_dcdc_init);
1031
1032 static void __exit wm831x_dcdc_exit(void)
1033 {
1034         platform_driver_unregister(&wm831x_epe_driver);
1035         platform_driver_unregister(&wm831x_boostp_driver);
1036         platform_driver_unregister(&wm831x_buckp_driver);
1037         platform_driver_unregister(&wm831x_buckv_driver);
1038 }
1039 module_exit(wm831x_dcdc_exit);
1040
1041 /* Module information */
1042 MODULE_AUTHOR("Mark Brown");
1043 MODULE_DESCRIPTION("WM831x DC-DC convertor driver");
1044 MODULE_LICENSE("GPL");
1045 MODULE_ALIAS("platform:wm831x-buckv");
1046 MODULE_ALIAS("platform:wm831x-buckp");