mfd: max77663: Add FPWM and FSRADE clearing when initialization
[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_set_dvs(struct regulator_dev *rdev, int state)
271 {
272         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
273
274         if (state == dcdc->dvs_gpio_state)
275                 return 0;
276
277         dcdc->dvs_gpio_state = state;
278         gpio_set_value(dcdc->dvs_gpio, state);
279
280         /* Should wait for DVS state change to be asserted if we have
281          * a GPIO for it, for now assume the device is configured
282          * for the fastest possible transition.
283          */
284
285         return 0;
286 }
287
288 static int wm831x_buckv_set_voltage(struct regulator_dev *rdev,
289                                     int min_uV, int max_uV, unsigned *selector)
290 {
291         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
292         struct wm831x *wm831x = dcdc->wm831x;
293         int on_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
294         int dvs_reg = dcdc->base + WM831X_DCDC_DVS_CONTROL;
295         int vsel, ret;
296
297         vsel = wm831x_buckv_select_min_voltage(rdev, min_uV, max_uV);
298         if (vsel < 0)
299                 return vsel;
300
301         *selector = vsel;
302
303         /* If this value is already set then do a GPIO update if we can */
304         if (dcdc->dvs_gpio && dcdc->on_vsel == vsel)
305                 return wm831x_buckv_set_dvs(rdev, 0);
306
307         if (dcdc->dvs_gpio && dcdc->dvs_vsel == vsel)
308                 return wm831x_buckv_set_dvs(rdev, 1);
309
310         /* Always set the ON status to the minimum voltage */
311         ret = wm831x_set_bits(wm831x, on_reg, WM831X_DC1_ON_VSEL_MASK, vsel);
312         if (ret < 0)
313                 return ret;
314         dcdc->on_vsel = vsel;
315
316         if (!dcdc->dvs_gpio)
317                 return ret;
318
319         /* Kick the voltage transition now */
320         ret = wm831x_buckv_set_dvs(rdev, 0);
321         if (ret < 0)
322                 return ret;
323
324         /*
325          * If this VSEL is higher than the last one we've seen then
326          * remember it as the DVS VSEL.  This is optimised for CPUfreq
327          * usage where we want to get to the highest voltage very
328          * quickly.
329          */
330         if (vsel > dcdc->dvs_vsel) {
331                 ret = wm831x_set_bits(wm831x, dvs_reg,
332                                       WM831X_DC1_DVS_VSEL_MASK,
333                                       dcdc->dvs_vsel);
334                 if (ret == 0)
335                         dcdc->dvs_vsel = vsel;
336                 else
337                         dev_warn(wm831x->dev,
338                                  "Failed to set DCDC DVS VSEL: %d\n", ret);
339         }
340
341         return 0;
342 }
343
344 static int wm831x_buckv_set_suspend_voltage(struct regulator_dev *rdev,
345                                             int uV)
346 {
347         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
348         struct wm831x *wm831x = dcdc->wm831x;
349         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
350         int vsel;
351
352         vsel = wm831x_buckv_select_min_voltage(rdev, uV, uV);
353         if (vsel < 0)
354                 return vsel;
355
356         return wm831x_set_bits(wm831x, reg, WM831X_DC1_SLP_VSEL_MASK, vsel);
357 }
358
359 static int wm831x_buckv_get_voltage_sel(struct regulator_dev *rdev)
360 {
361         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
362
363         if (dcdc->dvs_gpio && dcdc->dvs_gpio_state)
364                 return dcdc->dvs_vsel;
365         else
366                 return dcdc->on_vsel;
367 }
368
369 /* Current limit options */
370 static u16 wm831x_dcdc_ilim[] = {
371         125, 250, 375, 500, 625, 750, 875, 1000
372 };
373
374 static int wm831x_buckv_set_current_limit(struct regulator_dev *rdev,
375                                            int min_uA, int max_uA)
376 {
377         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
378         struct wm831x *wm831x = dcdc->wm831x;
379         u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
380         int i;
381
382         for (i = 0; i < ARRAY_SIZE(wm831x_dcdc_ilim); i++) {
383                 if (max_uA <= wm831x_dcdc_ilim[i])
384                         break;
385         }
386         if (i == ARRAY_SIZE(wm831x_dcdc_ilim))
387                 return -EINVAL;
388
389         return wm831x_set_bits(wm831x, reg, WM831X_DC1_HC_THR_MASK, i);
390 }
391
392 static int wm831x_buckv_get_current_limit(struct regulator_dev *rdev)
393 {
394         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
395         struct wm831x *wm831x = dcdc->wm831x;
396         u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
397         int val;
398
399         val = wm831x_reg_read(wm831x, reg);
400         if (val < 0)
401                 return val;
402
403         return wm831x_dcdc_ilim[val & WM831X_DC1_HC_THR_MASK];
404 }
405
406 static struct regulator_ops wm831x_buckv_ops = {
407         .set_voltage = wm831x_buckv_set_voltage,
408         .get_voltage_sel = wm831x_buckv_get_voltage_sel,
409         .list_voltage = wm831x_buckv_list_voltage,
410         .set_suspend_voltage = wm831x_buckv_set_suspend_voltage,
411         .set_current_limit = wm831x_buckv_set_current_limit,
412         .get_current_limit = wm831x_buckv_get_current_limit,
413
414         .is_enabled = wm831x_dcdc_is_enabled,
415         .enable = wm831x_dcdc_enable,
416         .disable = wm831x_dcdc_disable,
417         .get_status = wm831x_dcdc_get_status,
418         .get_mode = wm831x_dcdc_get_mode,
419         .set_mode = wm831x_dcdc_set_mode,
420         .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
421 };
422
423 /*
424  * Set up DVS control.  We just log errors since we can still run
425  * (with reduced performance) if we fail.
426  */
427 static __devinit void wm831x_buckv_dvs_init(struct wm831x_dcdc *dcdc,
428                                             struct wm831x_buckv_pdata *pdata)
429 {
430         struct wm831x *wm831x = dcdc->wm831x;
431         int ret;
432         u16 ctrl;
433
434         if (!pdata || !pdata->dvs_gpio)
435                 return;
436
437         ret = gpio_request(pdata->dvs_gpio, "DCDC DVS");
438         if (ret < 0) {
439                 dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %d\n",
440                         dcdc->name, ret);
441                 return;
442         }
443
444         /* gpiolib won't let us read the GPIO status so pick the higher
445          * of the two existing voltages so we take it as platform data.
446          */
447         dcdc->dvs_gpio_state = pdata->dvs_init_state;
448
449         ret = gpio_direction_output(pdata->dvs_gpio, dcdc->dvs_gpio_state);
450         if (ret < 0) {
451                 dev_err(wm831x->dev, "Failed to enable %s DVS GPIO: %d\n",
452                         dcdc->name, ret);
453                 gpio_free(pdata->dvs_gpio);
454                 return;
455         }
456
457         dcdc->dvs_gpio = pdata->dvs_gpio;
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         /* If DVS_VSEL is set to the minimum value then raise it to ON_VSEL
473          * to make bootstrapping a bit smoother.
474          */
475         if (!dcdc->dvs_vsel) {
476                 ret = wm831x_set_bits(wm831x,
477                                       dcdc->base + WM831X_DCDC_DVS_CONTROL,
478                                       WM831X_DC1_DVS_VSEL_MASK, dcdc->on_vsel);
479                 if (ret == 0)
480                         dcdc->dvs_vsel = dcdc->on_vsel;
481                 else
482                         dev_warn(wm831x->dev, "Failed to set DVS_VSEL: %d\n",
483                                  ret);
484         }
485
486         ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL,
487                               WM831X_DC1_DVS_SRC_MASK, ctrl);
488         if (ret < 0) {
489                 dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n",
490                         dcdc->name, ret);
491         }
492 }
493
494 static __devinit int wm831x_buckv_probe(struct platform_device *pdev)
495 {
496         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
497         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
498         int id;
499         struct wm831x_dcdc *dcdc;
500         struct resource *res;
501         int ret, irq;
502
503         if (pdata && pdata->wm831x_num)
504                 id = (pdata->wm831x_num * 10) + 1;
505         else
506                 id = 0;
507         id = pdev->id - id;
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_DVS_CONTROL);
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 = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
566                                    IRQF_TRIGGER_RISING, dcdc->name, dcdc);
567         if (ret != 0) {
568                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
569                         irq, ret);
570                 goto err_regulator;
571         }
572
573         irq = platform_get_irq_byname(pdev, "HC");
574         ret = request_threaded_irq(irq, NULL, wm831x_dcdc_oc_irq,
575                                    IRQF_TRIGGER_RISING, dcdc->name, dcdc);
576         if (ret != 0) {
577                 dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n",
578                         irq, ret);
579                 goto err_uv;
580         }
581
582         platform_set_drvdata(pdev, dcdc);
583
584         return 0;
585
586 err_uv:
587         free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
588 err_regulator:
589         regulator_unregister(dcdc->regulator);
590 err:
591         if (dcdc->dvs_gpio)
592                 gpio_free(dcdc->dvs_gpio);
593         kfree(dcdc);
594         return ret;
595 }
596
597 static __devexit int wm831x_buckv_remove(struct platform_device *pdev)
598 {
599         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
600
601         platform_set_drvdata(pdev, NULL);
602
603         free_irq(platform_get_irq_byname(pdev, "HC"), dcdc);
604         free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
605         regulator_unregister(dcdc->regulator);
606         if (dcdc->dvs_gpio)
607                 gpio_free(dcdc->dvs_gpio);
608         kfree(dcdc);
609
610         return 0;
611 }
612
613 static struct platform_driver wm831x_buckv_driver = {
614         .probe = wm831x_buckv_probe,
615         .remove = __devexit_p(wm831x_buckv_remove),
616         .driver         = {
617                 .name   = "wm831x-buckv",
618                 .owner  = THIS_MODULE,
619         },
620 };
621
622 /*
623  * BUCKP specifics
624  */
625
626 static int wm831x_buckp_list_voltage(struct regulator_dev *rdev,
627                                       unsigned selector)
628 {
629         if (selector <= WM831X_BUCKP_MAX_SELECTOR)
630                 return 850000 + (selector * 25000);
631         else
632                 return -EINVAL;
633 }
634
635 static int wm831x_buckp_set_voltage_int(struct regulator_dev *rdev, int reg,
636                                         int min_uV, int max_uV, int *selector)
637 {
638         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
639         struct wm831x *wm831x = dcdc->wm831x;
640         u16 vsel;
641
642         if (min_uV <= 34000000)
643                 vsel = (min_uV - 850000) / 25000;
644         else
645                 return -EINVAL;
646
647         if (wm831x_buckp_list_voltage(rdev, vsel) > max_uV)
648                 return -EINVAL;
649
650         *selector = vsel;
651
652         return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, vsel);
653 }
654
655 static int wm831x_buckp_set_voltage(struct regulator_dev *rdev,
656                                     int min_uV, int max_uV,
657                                     unsigned *selector)
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                                             selector);
664 }
665
666 static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev,
667                                             int uV)
668 {
669         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
670         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
671         unsigned selector;
672
673         return wm831x_buckp_set_voltage_int(rdev, reg, uV, uV, &selector);
674 }
675
676 static int wm831x_buckp_get_voltage_sel(struct regulator_dev *rdev)
677 {
678         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
679         struct wm831x *wm831x = dcdc->wm831x;
680         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
681         int val;
682
683         val = wm831x_reg_read(wm831x, reg);
684         if (val < 0)
685                 return val;
686
687         return val & WM831X_DC3_ON_VSEL_MASK;
688 }
689
690 static struct regulator_ops wm831x_buckp_ops = {
691         .set_voltage = wm831x_buckp_set_voltage,
692         .get_voltage_sel = wm831x_buckp_get_voltage_sel,
693         .list_voltage = wm831x_buckp_list_voltage,
694         .set_suspend_voltage = wm831x_buckp_set_suspend_voltage,
695
696         .is_enabled = wm831x_dcdc_is_enabled,
697         .enable = wm831x_dcdc_enable,
698         .disable = wm831x_dcdc_disable,
699         .get_status = wm831x_dcdc_get_status,
700         .get_mode = wm831x_dcdc_get_mode,
701         .set_mode = wm831x_dcdc_set_mode,
702         .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
703 };
704
705 static __devinit int wm831x_buckp_probe(struct platform_device *pdev)
706 {
707         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
708         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
709         int id;
710         struct wm831x_dcdc *dcdc;
711         struct resource *res;
712         int ret, irq;
713
714         if (pdata && pdata->wm831x_num)
715                 id = (pdata->wm831x_num * 10) + 1;
716         else
717                 id = 0;
718         id = pdev->id - id;
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 = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
760                                    IRQF_TRIGGER_RISING, dcdc->name, dcdc);
761         if (ret != 0) {
762                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
763                         irq, ret);
764                 goto err_regulator;
765         }
766
767         platform_set_drvdata(pdev, dcdc);
768
769         return 0;
770
771 err_regulator:
772         regulator_unregister(dcdc->regulator);
773 err:
774         kfree(dcdc);
775         return ret;
776 }
777
778 static __devexit int wm831x_buckp_remove(struct platform_device *pdev)
779 {
780         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
781
782         platform_set_drvdata(pdev, NULL);
783
784         free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
785         regulator_unregister(dcdc->regulator);
786         kfree(dcdc);
787
788         return 0;
789 }
790
791 static struct platform_driver wm831x_buckp_driver = {
792         .probe = wm831x_buckp_probe,
793         .remove = __devexit_p(wm831x_buckp_remove),
794         .driver         = {
795                 .name   = "wm831x-buckp",
796                 .owner  = THIS_MODULE,
797         },
798 };
799
800 /*
801  * DCDC boost convertors
802  */
803
804 static int wm831x_boostp_get_status(struct regulator_dev *rdev)
805 {
806         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
807         struct wm831x *wm831x = dcdc->wm831x;
808         int ret;
809
810         /* First, check for errors */
811         ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
812         if (ret < 0)
813                 return ret;
814
815         if (ret & (1 << rdev_get_id(rdev))) {
816                 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
817                         rdev_get_id(rdev) + 1);
818                 return REGULATOR_STATUS_ERROR;
819         }
820
821         /* Is the regulator on? */
822         ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
823         if (ret < 0)
824                 return ret;
825         if (ret & (1 << rdev_get_id(rdev)))
826                 return REGULATOR_STATUS_ON;
827         else
828                 return REGULATOR_STATUS_OFF;
829 }
830
831 static struct regulator_ops wm831x_boostp_ops = {
832         .get_status = wm831x_boostp_get_status,
833
834         .is_enabled = wm831x_dcdc_is_enabled,
835         .enable = wm831x_dcdc_enable,
836         .disable = wm831x_dcdc_disable,
837 };
838
839 static __devinit int wm831x_boostp_probe(struct platform_device *pdev)
840 {
841         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
842         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
843         int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
844         struct wm831x_dcdc *dcdc;
845         struct resource *res;
846         int ret, irq;
847
848         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
849
850         if (pdata == NULL || pdata->dcdc[id] == NULL)
851                 return -ENODEV;
852
853         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
854         if (dcdc == NULL) {
855                 dev_err(&pdev->dev, "Unable to allocate private data\n");
856                 return -ENOMEM;
857         }
858
859         dcdc->wm831x = wm831x;
860
861         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
862         if (res == NULL) {
863                 dev_err(&pdev->dev, "No I/O resource\n");
864                 ret = -EINVAL;
865                 goto err;
866         }
867         dcdc->base = res->start;
868
869         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
870         dcdc->desc.name = dcdc->name;
871         dcdc->desc.id = id;
872         dcdc->desc.type = REGULATOR_VOLTAGE;
873         dcdc->desc.ops = &wm831x_boostp_ops;
874         dcdc->desc.owner = THIS_MODULE;
875
876         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
877                                              pdata->dcdc[id], dcdc);
878         if (IS_ERR(dcdc->regulator)) {
879                 ret = PTR_ERR(dcdc->regulator);
880                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
881                         id + 1, ret);
882                 goto err;
883         }
884
885         irq = platform_get_irq_byname(pdev, "UV");
886         ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
887                                    IRQF_TRIGGER_RISING, dcdc->name,
888                                    dcdc);
889         if (ret != 0) {
890                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
891                         irq, ret);
892                 goto err_regulator;
893         }
894
895         platform_set_drvdata(pdev, dcdc);
896
897         return 0;
898
899 err_regulator:
900         regulator_unregister(dcdc->regulator);
901 err:
902         kfree(dcdc);
903         return ret;
904 }
905
906 static __devexit int wm831x_boostp_remove(struct platform_device *pdev)
907 {
908         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
909
910         platform_set_drvdata(pdev, NULL);
911
912         free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
913         regulator_unregister(dcdc->regulator);
914         kfree(dcdc);
915
916         return 0;
917 }
918
919 static struct platform_driver wm831x_boostp_driver = {
920         .probe = wm831x_boostp_probe,
921         .remove = __devexit_p(wm831x_boostp_remove),
922         .driver         = {
923                 .name   = "wm831x-boostp",
924                 .owner  = THIS_MODULE,
925         },
926 };
927
928 /*
929  * External Power Enable
930  *
931  * These aren't actually DCDCs but look like them in hardware so share
932  * code.
933  */
934
935 #define WM831X_EPE_BASE 6
936
937 static struct regulator_ops wm831x_epe_ops = {
938         .is_enabled = wm831x_dcdc_is_enabled,
939         .enable = wm831x_dcdc_enable,
940         .disable = wm831x_dcdc_disable,
941         .get_status = wm831x_dcdc_get_status,
942 };
943
944 static __devinit int wm831x_epe_probe(struct platform_device *pdev)
945 {
946         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
947         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
948         int id = pdev->id % ARRAY_SIZE(pdata->epe);
949         struct wm831x_dcdc *dcdc;
950         int ret;
951
952         dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1);
953
954         if (pdata == NULL || pdata->epe[id] == NULL)
955                 return -ENODEV;
956
957         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
958         if (dcdc == NULL) {
959                 dev_err(&pdev->dev, "Unable to allocate private data\n");
960                 return -ENOMEM;
961         }
962
963         dcdc->wm831x = wm831x;
964
965         /* For current parts this is correct; probably need to revisit
966          * in future.
967          */
968         snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1);
969         dcdc->desc.name = dcdc->name;
970         dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */
971         dcdc->desc.ops = &wm831x_epe_ops;
972         dcdc->desc.type = REGULATOR_VOLTAGE;
973         dcdc->desc.owner = THIS_MODULE;
974
975         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
976                                              pdata->epe[id], dcdc);
977         if (IS_ERR(dcdc->regulator)) {
978                 ret = PTR_ERR(dcdc->regulator);
979                 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n",
980                         id + 1, ret);
981                 goto err;
982         }
983
984         platform_set_drvdata(pdev, dcdc);
985
986         return 0;
987
988 err:
989         kfree(dcdc);
990         return ret;
991 }
992
993 static __devexit int wm831x_epe_remove(struct platform_device *pdev)
994 {
995         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
996
997         platform_set_drvdata(pdev, NULL);
998
999         regulator_unregister(dcdc->regulator);
1000         kfree(dcdc);
1001
1002         return 0;
1003 }
1004
1005 static struct platform_driver wm831x_epe_driver = {
1006         .probe = wm831x_epe_probe,
1007         .remove = __devexit_p(wm831x_epe_remove),
1008         .driver         = {
1009                 .name   = "wm831x-epe",
1010                 .owner  = THIS_MODULE,
1011         },
1012 };
1013
1014 static int __init wm831x_dcdc_init(void)
1015 {
1016         int ret;
1017         ret = platform_driver_register(&wm831x_buckv_driver);
1018         if (ret != 0)
1019                 pr_err("Failed to register WM831x BUCKV driver: %d\n", ret);
1020
1021         ret = platform_driver_register(&wm831x_buckp_driver);
1022         if (ret != 0)
1023                 pr_err("Failed to register WM831x BUCKP driver: %d\n", ret);
1024
1025         ret = platform_driver_register(&wm831x_boostp_driver);
1026         if (ret != 0)
1027                 pr_err("Failed to register WM831x BOOST driver: %d\n", ret);
1028
1029         ret = platform_driver_register(&wm831x_epe_driver);
1030         if (ret != 0)
1031                 pr_err("Failed to register WM831x EPE driver: %d\n", ret);
1032
1033         return 0;
1034 }
1035 subsys_initcall(wm831x_dcdc_init);
1036
1037 static void __exit wm831x_dcdc_exit(void)
1038 {
1039         platform_driver_unregister(&wm831x_epe_driver);
1040         platform_driver_unregister(&wm831x_boostp_driver);
1041         platform_driver_unregister(&wm831x_buckp_driver);
1042         platform_driver_unregister(&wm831x_buckv_driver);
1043 }
1044 module_exit(wm831x_dcdc_exit);
1045
1046 /* Module information */
1047 MODULE_AUTHOR("Mark Brown");
1048 MODULE_DESCRIPTION("WM831x DC-DC convertor driver");
1049 MODULE_LICENSE("GPL");
1050 MODULE_ALIAS("platform:wm831x-buckv");
1051 MODULE_ALIAS("platform:wm831x-buckp");
1052 MODULE_ALIAS("platform:wm831x-epe");