regulator: Report actual configured voltage to set_voltage()
[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, unsigned *selector)
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         *selector = vsel;
318
319         /* If this value is already set then do a GPIO update if we can */
320         if (dcdc->dvs_gpio && dcdc->on_vsel == vsel)
321                 return wm831x_buckv_set_dvs(rdev, 0);
322
323         if (dcdc->dvs_gpio && dcdc->dvs_vsel == vsel)
324                 return wm831x_buckv_set_dvs(rdev, 1);
325
326         /* Always set the ON status to the minimum voltage */
327         ret = wm831x_set_bits(wm831x, on_reg, WM831X_DC1_ON_VSEL_MASK, vsel);
328         if (ret < 0)
329                 return ret;
330         dcdc->on_vsel = vsel;
331
332         if (!dcdc->dvs_gpio)
333                 return ret;
334
335         /* Kick the voltage transition now */
336         ret = wm831x_buckv_set_dvs(rdev, 0);
337         if (ret < 0)
338                 return ret;
339
340         /* Set the high voltage as the DVS voltage.  This is optimised
341          * for CPUfreq usage, most processors will keep the maximum
342          * voltage constant and lower the minimum with the frequency. */
343         vsel = wm831x_buckv_select_max_voltage(rdev, min_uV, max_uV);
344         if (vsel < 0) {
345                 /* This should never happen - at worst the same vsel
346                  * should be chosen */
347                 WARN_ON(vsel < 0);
348                 return 0;
349         }
350
351         /* Don't bother if it's the same VSEL we're already using */
352         if (vsel == dcdc->on_vsel)
353                 return 0;
354
355         ret = wm831x_set_bits(wm831x, dvs_reg, WM831X_DC1_DVS_VSEL_MASK, vsel);
356         if (ret == 0)
357                 dcdc->dvs_vsel = vsel;
358         else
359                 dev_warn(wm831x->dev, "Failed to set DCDC DVS VSEL: %d\n",
360                          ret);
361
362         return 0;
363 }
364
365 static int wm831x_buckv_set_suspend_voltage(struct regulator_dev *rdev,
366                                             int uV)
367 {
368         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
369         struct wm831x *wm831x = dcdc->wm831x;
370         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
371         int vsel;
372
373         vsel = wm831x_buckv_select_min_voltage(rdev, uV, uV);
374         if (vsel < 0)
375                 return vsel;
376
377         return wm831x_set_bits(wm831x, reg, WM831X_DC1_SLP_VSEL_MASK, vsel);
378 }
379
380 static int wm831x_buckv_get_voltage(struct regulator_dev *rdev)
381 {
382         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
383
384         if (dcdc->dvs_gpio && dcdc->dvs_gpio_state)
385                 return wm831x_buckv_list_voltage(rdev, dcdc->dvs_vsel);
386         else
387                 return wm831x_buckv_list_voltage(rdev, dcdc->on_vsel);
388 }
389
390 /* Current limit options */
391 static u16 wm831x_dcdc_ilim[] = {
392         125, 250, 375, 500, 625, 750, 875, 1000
393 };
394
395 static int wm831x_buckv_set_current_limit(struct regulator_dev *rdev,
396                                            int min_uA, int max_uA)
397 {
398         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
399         struct wm831x *wm831x = dcdc->wm831x;
400         u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
401         int i;
402
403         for (i = 0; i < ARRAY_SIZE(wm831x_dcdc_ilim); i++) {
404                 if (max_uA <= wm831x_dcdc_ilim[i])
405                         break;
406         }
407         if (i == ARRAY_SIZE(wm831x_dcdc_ilim))
408                 return -EINVAL;
409
410         return wm831x_set_bits(wm831x, reg, WM831X_DC1_HC_THR_MASK, i);
411 }
412
413 static int wm831x_buckv_get_current_limit(struct regulator_dev *rdev)
414 {
415         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
416         struct wm831x *wm831x = dcdc->wm831x;
417         u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
418         int val;
419
420         val = wm831x_reg_read(wm831x, reg);
421         if (val < 0)
422                 return val;
423
424         return wm831x_dcdc_ilim[val & WM831X_DC1_HC_THR_MASK];
425 }
426
427 static struct regulator_ops wm831x_buckv_ops = {
428         .set_voltage = wm831x_buckv_set_voltage,
429         .get_voltage = wm831x_buckv_get_voltage,
430         .list_voltage = wm831x_buckv_list_voltage,
431         .set_suspend_voltage = wm831x_buckv_set_suspend_voltage,
432         .set_current_limit = wm831x_buckv_set_current_limit,
433         .get_current_limit = wm831x_buckv_get_current_limit,
434
435         .is_enabled = wm831x_dcdc_is_enabled,
436         .enable = wm831x_dcdc_enable,
437         .disable = wm831x_dcdc_disable,
438         .get_status = wm831x_dcdc_get_status,
439         .get_mode = wm831x_dcdc_get_mode,
440         .set_mode = wm831x_dcdc_set_mode,
441         .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
442 };
443
444 /*
445  * Set up DVS control.  We just log errors since we can still run
446  * (with reduced performance) if we fail.
447  */
448 static __devinit void wm831x_buckv_dvs_init(struct wm831x_dcdc *dcdc,
449                                             struct wm831x_buckv_pdata *pdata)
450 {
451         struct wm831x *wm831x = dcdc->wm831x;
452         int ret;
453         u16 ctrl;
454
455         if (!pdata || !pdata->dvs_gpio)
456                 return;
457
458         switch (pdata->dvs_control_src) {
459         case 1:
460                 ctrl = 2 << WM831X_DC1_DVS_SRC_SHIFT;
461                 break;
462         case 2:
463                 ctrl = 3 << WM831X_DC1_DVS_SRC_SHIFT;
464                 break;
465         default:
466                 dev_err(wm831x->dev, "Invalid DVS control source %d for %s\n",
467                         pdata->dvs_control_src, dcdc->name);
468                 return;
469         }
470
471         ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL,
472                               WM831X_DC1_DVS_SRC_MASK, ctrl);
473         if (ret < 0) {
474                 dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n",
475                         dcdc->name, ret);
476                 return;
477         }
478
479         ret = gpio_request(pdata->dvs_gpio, "DCDC DVS");
480         if (ret < 0) {
481                 dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %d\n",
482                         dcdc->name, ret);
483                 return;
484         }
485
486         /* gpiolib won't let us read the GPIO status so pick the higher
487          * of the two existing voltages so we take it as platform data.
488          */
489         dcdc->dvs_gpio_state = pdata->dvs_init_state;
490
491         ret = gpio_direction_output(pdata->dvs_gpio, dcdc->dvs_gpio_state);
492         if (ret < 0) {
493                 dev_err(wm831x->dev, "Failed to enable %s DVS GPIO: %d\n",
494                         dcdc->name, ret);
495                 gpio_free(pdata->dvs_gpio);
496                 return;
497         }
498
499         dcdc->dvs_gpio = pdata->dvs_gpio;
500 }
501
502 static __devinit int wm831x_buckv_probe(struct platform_device *pdev)
503 {
504         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
505         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
506         int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
507         struct wm831x_dcdc *dcdc;
508         struct resource *res;
509         int ret, irq;
510
511         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
512
513         if (pdata == NULL || pdata->dcdc[id] == NULL)
514                 return -ENODEV;
515
516         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
517         if (dcdc == NULL) {
518                 dev_err(&pdev->dev, "Unable to allocate private data\n");
519                 return -ENOMEM;
520         }
521
522         dcdc->wm831x = wm831x;
523
524         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
525         if (res == NULL) {
526                 dev_err(&pdev->dev, "No I/O resource\n");
527                 ret = -EINVAL;
528                 goto err;
529         }
530         dcdc->base = res->start;
531
532         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
533         dcdc->desc.name = dcdc->name;
534         dcdc->desc.id = id;
535         dcdc->desc.type = REGULATOR_VOLTAGE;
536         dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1;
537         dcdc->desc.ops = &wm831x_buckv_ops;
538         dcdc->desc.owner = THIS_MODULE;
539
540         ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG);
541         if (ret < 0) {
542                 dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret);
543                 goto err;
544         }
545         dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK;
546
547         ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG);
548         if (ret < 0) {
549                 dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret);
550                 goto err;
551         }
552         dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK;
553
554         if (pdata->dcdc[id])
555                 wm831x_buckv_dvs_init(dcdc, pdata->dcdc[id]->driver_data);
556
557         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
558                                              pdata->dcdc[id], dcdc);
559         if (IS_ERR(dcdc->regulator)) {
560                 ret = PTR_ERR(dcdc->regulator);
561                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
562                         id + 1, ret);
563                 goto err;
564         }
565
566         irq = platform_get_irq_byname(pdev, "UV");
567         ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_uv_irq,
568                                  IRQF_TRIGGER_RISING, dcdc->name,
569                                  dcdc);
570         if (ret != 0) {
571                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
572                         irq, ret);
573                 goto err_regulator;
574         }
575
576         irq = platform_get_irq_byname(pdev, "HC");
577         ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_oc_irq,
578                                  IRQF_TRIGGER_RISING, dcdc->name,
579                                  dcdc);
580         if (ret != 0) {
581                 dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n",
582                         irq, ret);
583                 goto err_uv;
584         }
585
586         platform_set_drvdata(pdev, dcdc);
587
588         return 0;
589
590 err_uv:
591         wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc);
592 err_regulator:
593         regulator_unregister(dcdc->regulator);
594 err:
595         if (dcdc->dvs_gpio)
596                 gpio_free(dcdc->dvs_gpio);
597         kfree(dcdc);
598         return ret;
599 }
600
601 static __devexit int wm831x_buckv_remove(struct platform_device *pdev)
602 {
603         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
604         struct wm831x *wm831x = dcdc->wm831x;
605
606         platform_set_drvdata(pdev, NULL);
607
608         wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "HC"), dcdc);
609         wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc);
610         regulator_unregister(dcdc->regulator);
611         if (dcdc->dvs_gpio)
612                 gpio_free(dcdc->dvs_gpio);
613         kfree(dcdc);
614
615         return 0;
616 }
617
618 static struct platform_driver wm831x_buckv_driver = {
619         .probe = wm831x_buckv_probe,
620         .remove = __devexit_p(wm831x_buckv_remove),
621         .driver         = {
622                 .name   = "wm831x-buckv",
623                 .owner  = THIS_MODULE,
624         },
625 };
626
627 /*
628  * BUCKP specifics
629  */
630
631 static int wm831x_buckp_list_voltage(struct regulator_dev *rdev,
632                                       unsigned selector)
633 {
634         if (selector <= WM831X_BUCKP_MAX_SELECTOR)
635                 return 850000 + (selector * 25000);
636         else
637                 return -EINVAL;
638 }
639
640 static int wm831x_buckp_set_voltage_int(struct regulator_dev *rdev, int reg,
641                                         int min_uV, int max_uV, int *selector)
642 {
643         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
644         struct wm831x *wm831x = dcdc->wm831x;
645         u16 vsel;
646
647         if (min_uV <= 34000000)
648                 vsel = (min_uV - 850000) / 25000;
649         else
650                 return -EINVAL;
651
652         if (wm831x_buckp_list_voltage(rdev, vsel) > max_uV)
653                 return -EINVAL;
654
655         *selector = vsel;
656
657         return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, vsel);
658 }
659
660 static int wm831x_buckp_set_voltage(struct regulator_dev *rdev,
661                                     int min_uV, int max_uV,
662                                     unsigned *selector)
663 {
664         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
665         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
666
667         return wm831x_buckp_set_voltage_int(rdev, reg, min_uV, max_uV,
668                                             selector);
669 }
670
671 static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev,
672                                             int uV)
673 {
674         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
675         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
676         unsigned selector;
677
678         return wm831x_buckp_set_voltage_int(rdev, reg, uV, uV, &selector);
679 }
680
681 static int wm831x_buckp_get_voltage(struct regulator_dev *rdev)
682 {
683         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
684         struct wm831x *wm831x = dcdc->wm831x;
685         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
686         int val;
687
688         val = wm831x_reg_read(wm831x, reg);
689         if (val < 0)
690                 return val;
691
692         return wm831x_buckp_list_voltage(rdev, val & WM831X_DC3_ON_VSEL_MASK);
693 }
694
695 static struct regulator_ops wm831x_buckp_ops = {
696         .set_voltage = wm831x_buckp_set_voltage,
697         .get_voltage = wm831x_buckp_get_voltage,
698         .list_voltage = wm831x_buckp_list_voltage,
699         .set_suspend_voltage = wm831x_buckp_set_suspend_voltage,
700
701         .is_enabled = wm831x_dcdc_is_enabled,
702         .enable = wm831x_dcdc_enable,
703         .disable = wm831x_dcdc_disable,
704         .get_status = wm831x_dcdc_get_status,
705         .get_mode = wm831x_dcdc_get_mode,
706         .set_mode = wm831x_dcdc_set_mode,
707         .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
708 };
709
710 static __devinit int wm831x_buckp_probe(struct platform_device *pdev)
711 {
712         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
713         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
714         int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
715         struct wm831x_dcdc *dcdc;
716         struct resource *res;
717         int ret, irq;
718
719         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
720
721         if (pdata == NULL || pdata->dcdc[id] == NULL)
722                 return -ENODEV;
723
724         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
725         if (dcdc == NULL) {
726                 dev_err(&pdev->dev, "Unable to allocate private data\n");
727                 return -ENOMEM;
728         }
729
730         dcdc->wm831x = wm831x;
731
732         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
733         if (res == NULL) {
734                 dev_err(&pdev->dev, "No I/O resource\n");
735                 ret = -EINVAL;
736                 goto err;
737         }
738         dcdc->base = res->start;
739
740         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
741         dcdc->desc.name = dcdc->name;
742         dcdc->desc.id = id;
743         dcdc->desc.type = REGULATOR_VOLTAGE;
744         dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1;
745         dcdc->desc.ops = &wm831x_buckp_ops;
746         dcdc->desc.owner = THIS_MODULE;
747
748         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
749                                              pdata->dcdc[id], dcdc);
750         if (IS_ERR(dcdc->regulator)) {
751                 ret = PTR_ERR(dcdc->regulator);
752                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
753                         id + 1, ret);
754                 goto err;
755         }
756
757         irq = platform_get_irq_byname(pdev, "UV");
758         ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_uv_irq,
759                                  IRQF_TRIGGER_RISING, dcdc->name,
760                                  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         struct wm831x *wm831x = dcdc->wm831x;
782
783         platform_set_drvdata(pdev, NULL);
784
785         wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc);
786         regulator_unregister(dcdc->regulator);
787         kfree(dcdc);
788
789         return 0;
790 }
791
792 static struct platform_driver wm831x_buckp_driver = {
793         .probe = wm831x_buckp_probe,
794         .remove = __devexit_p(wm831x_buckp_remove),
795         .driver         = {
796                 .name   = "wm831x-buckp",
797                 .owner  = THIS_MODULE,
798         },
799 };
800
801 /*
802  * DCDC boost convertors
803  */
804
805 static int wm831x_boostp_get_status(struct regulator_dev *rdev)
806 {
807         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
808         struct wm831x *wm831x = dcdc->wm831x;
809         int ret;
810
811         /* First, check for errors */
812         ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
813         if (ret < 0)
814                 return ret;
815
816         if (ret & (1 << rdev_get_id(rdev))) {
817                 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
818                         rdev_get_id(rdev) + 1);
819                 return REGULATOR_STATUS_ERROR;
820         }
821
822         /* Is the regulator on? */
823         ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
824         if (ret < 0)
825                 return ret;
826         if (ret & (1 << rdev_get_id(rdev)))
827                 return REGULATOR_STATUS_ON;
828         else
829                 return REGULATOR_STATUS_OFF;
830 }
831
832 static struct regulator_ops wm831x_boostp_ops = {
833         .get_status = wm831x_boostp_get_status,
834
835         .is_enabled = wm831x_dcdc_is_enabled,
836         .enable = wm831x_dcdc_enable,
837         .disable = wm831x_dcdc_disable,
838 };
839
840 static __devinit int wm831x_boostp_probe(struct platform_device *pdev)
841 {
842         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
843         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
844         int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
845         struct wm831x_dcdc *dcdc;
846         struct resource *res;
847         int ret, irq;
848
849         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
850
851         if (pdata == NULL || pdata->dcdc[id] == NULL)
852                 return -ENODEV;
853
854         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
855         if (dcdc == NULL) {
856                 dev_err(&pdev->dev, "Unable to allocate private data\n");
857                 return -ENOMEM;
858         }
859
860         dcdc->wm831x = wm831x;
861
862         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
863         if (res == NULL) {
864                 dev_err(&pdev->dev, "No I/O resource\n");
865                 ret = -EINVAL;
866                 goto err;
867         }
868         dcdc->base = res->start;
869
870         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
871         dcdc->desc.name = dcdc->name;
872         dcdc->desc.id = id;
873         dcdc->desc.type = REGULATOR_VOLTAGE;
874         dcdc->desc.ops = &wm831x_boostp_ops;
875         dcdc->desc.owner = THIS_MODULE;
876
877         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
878                                              pdata->dcdc[id], dcdc);
879         if (IS_ERR(dcdc->regulator)) {
880                 ret = PTR_ERR(dcdc->regulator);
881                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
882                         id + 1, ret);
883                 goto err;
884         }
885
886         irq = platform_get_irq_byname(pdev, "UV");
887         ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_uv_irq,
888                                  IRQF_TRIGGER_RISING, dcdc->name,
889                                  dcdc);
890         if (ret != 0) {
891                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
892                         irq, ret);
893                 goto err_regulator;
894         }
895
896         platform_set_drvdata(pdev, dcdc);
897
898         return 0;
899
900 err_regulator:
901         regulator_unregister(dcdc->regulator);
902 err:
903         kfree(dcdc);
904         return ret;
905 }
906
907 static __devexit int wm831x_boostp_remove(struct platform_device *pdev)
908 {
909         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
910         struct wm831x *wm831x = dcdc->wm831x;
911
912         platform_set_drvdata(pdev, NULL);
913
914         wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc);
915         regulator_unregister(dcdc->regulator);
916         kfree(dcdc);
917
918         return 0;
919 }
920
921 static struct platform_driver wm831x_boostp_driver = {
922         .probe = wm831x_boostp_probe,
923         .remove = __devexit_p(wm831x_boostp_remove),
924         .driver         = {
925                 .name   = "wm831x-boostp",
926                 .owner  = THIS_MODULE,
927         },
928 };
929
930 /*
931  * External Power Enable
932  *
933  * These aren't actually DCDCs but look like them in hardware so share
934  * code.
935  */
936
937 #define WM831X_EPE_BASE 6
938
939 static struct regulator_ops wm831x_epe_ops = {
940         .is_enabled = wm831x_dcdc_is_enabled,
941         .enable = wm831x_dcdc_enable,
942         .disable = wm831x_dcdc_disable,
943         .get_status = wm831x_dcdc_get_status,
944 };
945
946 static __devinit int wm831x_epe_probe(struct platform_device *pdev)
947 {
948         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
949         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
950         int id = pdev->id % ARRAY_SIZE(pdata->epe);
951         struct wm831x_dcdc *dcdc;
952         int ret;
953
954         dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1);
955
956         if (pdata == NULL || pdata->epe[id] == NULL)
957                 return -ENODEV;
958
959         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
960         if (dcdc == NULL) {
961                 dev_err(&pdev->dev, "Unable to allocate private data\n");
962                 return -ENOMEM;
963         }
964
965         dcdc->wm831x = wm831x;
966
967         /* For current parts this is correct; probably need to revisit
968          * in future.
969          */
970         snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1);
971         dcdc->desc.name = dcdc->name;
972         dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */
973         dcdc->desc.ops = &wm831x_epe_ops;
974         dcdc->desc.type = REGULATOR_VOLTAGE;
975         dcdc->desc.owner = THIS_MODULE;
976
977         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
978                                              pdata->epe[id], dcdc);
979         if (IS_ERR(dcdc->regulator)) {
980                 ret = PTR_ERR(dcdc->regulator);
981                 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n",
982                         id + 1, ret);
983                 goto err;
984         }
985
986         platform_set_drvdata(pdev, dcdc);
987
988         return 0;
989
990 err:
991         kfree(dcdc);
992         return ret;
993 }
994
995 static __devexit int wm831x_epe_remove(struct platform_device *pdev)
996 {
997         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
998
999         platform_set_drvdata(pdev, NULL);
1000
1001         regulator_unregister(dcdc->regulator);
1002         kfree(dcdc);
1003
1004         return 0;
1005 }
1006
1007 static struct platform_driver wm831x_epe_driver = {
1008         .probe = wm831x_epe_probe,
1009         .remove = __devexit_p(wm831x_epe_remove),
1010         .driver         = {
1011                 .name   = "wm831x-epe",
1012                 .owner  = THIS_MODULE,
1013         },
1014 };
1015
1016 static int __init wm831x_dcdc_init(void)
1017 {
1018         int ret;
1019         ret = platform_driver_register(&wm831x_buckv_driver);
1020         if (ret != 0)
1021                 pr_err("Failed to register WM831x BUCKV driver: %d\n", ret);
1022
1023         ret = platform_driver_register(&wm831x_buckp_driver);
1024         if (ret != 0)
1025                 pr_err("Failed to register WM831x BUCKP driver: %d\n", ret);
1026
1027         ret = platform_driver_register(&wm831x_boostp_driver);
1028         if (ret != 0)
1029                 pr_err("Failed to register WM831x BOOST driver: %d\n", ret);
1030
1031         ret = platform_driver_register(&wm831x_epe_driver);
1032         if (ret != 0)
1033                 pr_err("Failed to register WM831x EPE driver: %d\n", ret);
1034
1035         return 0;
1036 }
1037 subsys_initcall(wm831x_dcdc_init);
1038
1039 static void __exit wm831x_dcdc_exit(void)
1040 {
1041         platform_driver_unregister(&wm831x_epe_driver);
1042         platform_driver_unregister(&wm831x_boostp_driver);
1043         platform_driver_unregister(&wm831x_buckp_driver);
1044         platform_driver_unregister(&wm831x_buckv_driver);
1045 }
1046 module_exit(wm831x_dcdc_exit);
1047
1048 /* Module information */
1049 MODULE_AUTHOR("Mark Brown");
1050 MODULE_DESCRIPTION("WM831x DC-DC convertor driver");
1051 MODULE_LICENSE("GPL");
1052 MODULE_ALIAS("platform:wm831x-buckv");
1053 MODULE_ALIAS("platform:wm831x-buckp");