Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6
[linux-2.6.git] / drivers / power / wm831x_power.c
1 /*
2  * PMU driver for Wolfson Microelectronics wm831x PMICs
3  *
4  * Copyright 2009 Wolfson Microelectronics PLC.
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  */
10
11 #include <linux/module.h>
12 #include <linux/err.h>
13 #include <linux/platform_device.h>
14 #include <linux/power_supply.h>
15
16 #include <linux/mfd/wm831x/core.h>
17 #include <linux/mfd/wm831x/auxadc.h>
18 #include <linux/mfd/wm831x/pmu.h>
19 #include <linux/mfd/wm831x/pdata.h>
20
21 struct wm831x_power {
22         struct wm831x *wm831x;
23         struct power_supply wall;
24         struct power_supply usb;
25         struct power_supply battery;
26 };
27
28 static int wm831x_power_check_online(struct wm831x *wm831x, int supply,
29                                      union power_supply_propval *val)
30 {
31         int ret;
32
33         ret = wm831x_reg_read(wm831x, WM831X_SYSTEM_STATUS);
34         if (ret < 0)
35                 return ret;
36
37         if (ret & supply)
38                 val->intval = 1;
39         else
40                 val->intval = 0;
41
42         return 0;
43 }
44
45 static int wm831x_power_read_voltage(struct wm831x *wm831x,
46                                      enum wm831x_auxadc src,
47                                      union power_supply_propval *val)
48 {
49         int ret;
50
51         ret = wm831x_auxadc_read_uv(wm831x, src);
52         if (ret >= 0)
53                 val->intval = ret;
54
55         return ret;
56 }
57
58 /*********************************************************************
59  *              WALL Power
60  *********************************************************************/
61 static int wm831x_wall_get_prop(struct power_supply *psy,
62                                 enum power_supply_property psp,
63                                 union power_supply_propval *val)
64 {
65         struct wm831x_power *wm831x_power = dev_get_drvdata(psy->dev->parent);
66         struct wm831x *wm831x = wm831x_power->wm831x;
67         int ret = 0;
68
69         switch (psp) {
70         case POWER_SUPPLY_PROP_ONLINE:
71                 ret = wm831x_power_check_online(wm831x, WM831X_PWR_WALL, val);
72                 break;
73         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
74                 ret = wm831x_power_read_voltage(wm831x, WM831X_AUX_WALL, val);
75                 break;
76         default:
77                 ret = -EINVAL;
78                 break;
79         }
80
81         return ret;
82 }
83
84 static enum power_supply_property wm831x_wall_props[] = {
85         POWER_SUPPLY_PROP_ONLINE,
86         POWER_SUPPLY_PROP_VOLTAGE_NOW,
87 };
88
89 /*********************************************************************
90  *              USB Power
91  *********************************************************************/
92 static int wm831x_usb_get_prop(struct power_supply *psy,
93                                enum power_supply_property psp,
94                                union power_supply_propval *val)
95 {
96         struct wm831x_power *wm831x_power = dev_get_drvdata(psy->dev->parent);
97         struct wm831x *wm831x = wm831x_power->wm831x;
98         int ret = 0;
99
100         switch (psp) {
101         case POWER_SUPPLY_PROP_ONLINE:
102                 ret = wm831x_power_check_online(wm831x, WM831X_PWR_USB, val);
103                 break;
104         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
105                 ret = wm831x_power_read_voltage(wm831x, WM831X_AUX_USB, val);
106                 break;
107         default:
108                 ret = -EINVAL;
109                 break;
110         }
111
112         return ret;
113 }
114
115 static enum power_supply_property wm831x_usb_props[] = {
116         POWER_SUPPLY_PROP_ONLINE,
117         POWER_SUPPLY_PROP_VOLTAGE_NOW,
118 };
119
120 /*********************************************************************
121  *              Battery properties
122  *********************************************************************/
123
124 struct chg_map {
125         int val;
126         int reg_val;
127 };
128
129 static struct chg_map trickle_ilims[] = {
130         {  50, 0 << WM831X_CHG_TRKL_ILIM_SHIFT },
131         { 100, 1 << WM831X_CHG_TRKL_ILIM_SHIFT },
132         { 150, 2 << WM831X_CHG_TRKL_ILIM_SHIFT },
133         { 200, 3 << WM831X_CHG_TRKL_ILIM_SHIFT },
134 };
135
136 static struct chg_map vsels[] = {
137         { 4050, 0 << WM831X_CHG_VSEL_SHIFT },
138         { 4100, 1 << WM831X_CHG_VSEL_SHIFT },
139         { 4150, 2 << WM831X_CHG_VSEL_SHIFT },
140         { 4200, 3 << WM831X_CHG_VSEL_SHIFT },
141 };
142
143 static struct chg_map fast_ilims[] = {
144         {    0,  0 << WM831X_CHG_FAST_ILIM_SHIFT },
145         {   50,  1 << WM831X_CHG_FAST_ILIM_SHIFT },
146         {  100,  2 << WM831X_CHG_FAST_ILIM_SHIFT },
147         {  150,  3 << WM831X_CHG_FAST_ILIM_SHIFT },
148         {  200,  4 << WM831X_CHG_FAST_ILIM_SHIFT },
149         {  250,  5 << WM831X_CHG_FAST_ILIM_SHIFT },
150         {  300,  6 << WM831X_CHG_FAST_ILIM_SHIFT },
151         {  350,  7 << WM831X_CHG_FAST_ILIM_SHIFT },
152         {  400,  8 << WM831X_CHG_FAST_ILIM_SHIFT },
153         {  450,  9 << WM831X_CHG_FAST_ILIM_SHIFT },
154         {  500, 10 << WM831X_CHG_FAST_ILIM_SHIFT },
155         {  600, 11 << WM831X_CHG_FAST_ILIM_SHIFT },
156         {  700, 12 << WM831X_CHG_FAST_ILIM_SHIFT },
157         {  800, 13 << WM831X_CHG_FAST_ILIM_SHIFT },
158         {  900, 14 << WM831X_CHG_FAST_ILIM_SHIFT },
159         { 1000, 15 << WM831X_CHG_FAST_ILIM_SHIFT },
160 };
161
162 static struct chg_map eoc_iterms[] = {
163         { 20, 0 << WM831X_CHG_ITERM_SHIFT },
164         { 30, 1 << WM831X_CHG_ITERM_SHIFT },
165         { 40, 2 << WM831X_CHG_ITERM_SHIFT },
166         { 50, 3 << WM831X_CHG_ITERM_SHIFT },
167         { 60, 4 << WM831X_CHG_ITERM_SHIFT },
168         { 70, 5 << WM831X_CHG_ITERM_SHIFT },
169         { 80, 6 << WM831X_CHG_ITERM_SHIFT },
170         { 90, 7 << WM831X_CHG_ITERM_SHIFT },
171 };
172
173 static struct chg_map chg_times[] = {
174         {  60,  0 << WM831X_CHG_TIME_SHIFT },
175         {  90,  1 << WM831X_CHG_TIME_SHIFT },
176         { 120,  2 << WM831X_CHG_TIME_SHIFT },
177         { 150,  3 << WM831X_CHG_TIME_SHIFT },
178         { 180,  4 << WM831X_CHG_TIME_SHIFT },
179         { 210,  5 << WM831X_CHG_TIME_SHIFT },
180         { 240,  6 << WM831X_CHG_TIME_SHIFT },
181         { 270,  7 << WM831X_CHG_TIME_SHIFT },
182         { 300,  8 << WM831X_CHG_TIME_SHIFT },
183         { 330,  9 << WM831X_CHG_TIME_SHIFT },
184         { 360, 10 << WM831X_CHG_TIME_SHIFT },
185         { 390, 11 << WM831X_CHG_TIME_SHIFT },
186         { 420, 12 << WM831X_CHG_TIME_SHIFT },
187         { 450, 13 << WM831X_CHG_TIME_SHIFT },
188         { 480, 14 << WM831X_CHG_TIME_SHIFT },
189         { 510, 15 << WM831X_CHG_TIME_SHIFT },
190 };
191
192 static void wm831x_battey_apply_config(struct wm831x *wm831x,
193                                        struct chg_map *map, int count, int val,
194                                        int *reg, const char *name,
195                                        const char *units)
196 {
197         int i;
198
199         for (i = 0; i < count; i++)
200                 if (val == map[i].val)
201                         break;
202         if (i == count) {
203                 dev_err(wm831x->dev, "Invalid %s %d%s\n",
204                         name, val, units);
205         } else {
206                 *reg |= map[i].reg_val;
207                 dev_dbg(wm831x->dev, "Set %s of %d%s\n", name, val, units);
208         }
209 }
210
211 static void wm831x_config_battery(struct wm831x *wm831x)
212 {
213         struct wm831x_pdata *wm831x_pdata = wm831x->dev->platform_data;
214         struct wm831x_battery_pdata *pdata;
215         int ret, reg1, reg2;
216
217         if (!wm831x_pdata || !wm831x_pdata->battery) {
218                 dev_warn(wm831x->dev,
219                          "No battery charger configuration\n");
220                 return;
221         }
222
223         pdata = wm831x_pdata->battery;
224
225         reg1 = 0;
226         reg2 = 0;
227
228         if (!pdata->enable) {
229                 dev_info(wm831x->dev, "Battery charger disabled\n");
230                 return;
231         }
232
233         reg1 |= WM831X_CHG_ENA;
234         if (pdata->off_mask)
235                 reg2 |= WM831X_CHG_OFF_MSK;
236         if (pdata->fast_enable)
237                 reg1 |= WM831X_CHG_FAST;
238
239         wm831x_battey_apply_config(wm831x, trickle_ilims,
240                                    ARRAY_SIZE(trickle_ilims),
241                                    pdata->trickle_ilim, &reg2,
242                                    "trickle charge current limit", "mA");
243
244         wm831x_battey_apply_config(wm831x, vsels, ARRAY_SIZE(vsels),
245                                    pdata->vsel, &reg2,
246                                    "target voltage", "mV");
247
248         wm831x_battey_apply_config(wm831x, fast_ilims, ARRAY_SIZE(fast_ilims),
249                                    pdata->fast_ilim, &reg2,
250                                    "fast charge current limit", "mA");
251
252         wm831x_battey_apply_config(wm831x, eoc_iterms, ARRAY_SIZE(eoc_iterms),
253                                    pdata->eoc_iterm, &reg1,
254                                    "end of charge current threshold", "mA");
255
256         wm831x_battey_apply_config(wm831x, chg_times, ARRAY_SIZE(chg_times),
257                                    pdata->timeout, &reg2,
258                                    "charger timeout", "min");
259
260         ret = wm831x_reg_unlock(wm831x);
261         if (ret != 0) {
262                 dev_err(wm831x->dev, "Failed to unlock registers: %d\n", ret);
263                 return;
264         }
265
266         ret = wm831x_set_bits(wm831x, WM831X_CHARGER_CONTROL_1,
267                               WM831X_CHG_ENA_MASK |
268                               WM831X_CHG_FAST_MASK |
269                               WM831X_CHG_ITERM_MASK |
270                               WM831X_CHG_ITERM_MASK,
271                               reg1);
272         if (ret != 0)
273                 dev_err(wm831x->dev, "Failed to set charger control 1: %d\n",
274                         ret);
275
276         ret = wm831x_set_bits(wm831x, WM831X_CHARGER_CONTROL_2,
277                               WM831X_CHG_OFF_MSK |
278                               WM831X_CHG_TIME_MASK |
279                               WM831X_CHG_FAST_ILIM_MASK |
280                               WM831X_CHG_TRKL_ILIM_MASK |
281                               WM831X_CHG_VSEL_MASK,
282                               reg2);
283         if (ret != 0)
284                 dev_err(wm831x->dev, "Failed to set charger control 2: %d\n",
285                         ret);
286
287         wm831x_reg_lock(wm831x);
288 }
289
290 static int wm831x_bat_check_status(struct wm831x *wm831x, int *status)
291 {
292         int ret;
293
294         ret = wm831x_reg_read(wm831x, WM831X_SYSTEM_STATUS);
295         if (ret < 0)
296                 return ret;
297
298         if (ret & WM831X_PWR_SRC_BATT) {
299                 *status = POWER_SUPPLY_STATUS_DISCHARGING;
300                 return 0;
301         }
302
303         ret = wm831x_reg_read(wm831x, WM831X_CHARGER_STATUS);
304         if (ret < 0)
305                 return ret;
306
307         switch (ret & WM831X_CHG_STATE_MASK) {
308         case WM831X_CHG_STATE_OFF:
309                 *status = POWER_SUPPLY_STATUS_NOT_CHARGING;
310                 break;
311         case WM831X_CHG_STATE_TRICKLE:
312         case WM831X_CHG_STATE_FAST:
313                 *status = POWER_SUPPLY_STATUS_CHARGING;
314                 break;
315
316         default:
317                 *status = POWER_SUPPLY_STATUS_UNKNOWN;
318                 break;
319         }
320
321         return 0;
322 }
323
324 static int wm831x_bat_check_type(struct wm831x *wm831x, int *type)
325 {
326         int ret;
327
328         ret = wm831x_reg_read(wm831x, WM831X_CHARGER_STATUS);
329         if (ret < 0)
330                 return ret;
331
332         switch (ret & WM831X_CHG_STATE_MASK) {
333         case WM831X_CHG_STATE_TRICKLE:
334         case WM831X_CHG_STATE_TRICKLE_OT:
335                 *type = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
336                 break;
337         case WM831X_CHG_STATE_FAST:
338         case WM831X_CHG_STATE_FAST_OT:
339                 *type = POWER_SUPPLY_CHARGE_TYPE_FAST;
340                 break;
341         default:
342                 *type = POWER_SUPPLY_CHARGE_TYPE_NONE;
343                 break;
344         }
345
346         return 0;
347 }
348
349 static int wm831x_bat_check_health(struct wm831x *wm831x, int *health)
350 {
351         int ret;
352
353         ret = wm831x_reg_read(wm831x, WM831X_CHARGER_STATUS);
354         if (ret < 0)
355                 return ret;
356
357         if (ret & WM831X_BATT_HOT_STS) {
358                 *health = POWER_SUPPLY_HEALTH_OVERHEAT;
359                 return 0;
360         }
361
362         if (ret & WM831X_BATT_COLD_STS) {
363                 *health = POWER_SUPPLY_HEALTH_COLD;
364                 return 0;
365         }
366
367         if (ret & WM831X_BATT_OV_STS) {
368                 *health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
369                 return 0;
370         }
371
372         switch (ret & WM831X_CHG_STATE_MASK) {
373         case WM831X_CHG_STATE_TRICKLE_OT:
374         case WM831X_CHG_STATE_FAST_OT:
375                 *health = POWER_SUPPLY_HEALTH_OVERHEAT;
376                 break;
377         case WM831X_CHG_STATE_DEFECTIVE:
378                 *health = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
379                 break;
380         default:
381                 *health = POWER_SUPPLY_HEALTH_GOOD;
382                 break;
383         }
384
385         return 0;
386 }
387
388 static int wm831x_bat_get_prop(struct power_supply *psy,
389                                enum power_supply_property psp,
390                                union power_supply_propval *val)
391 {
392         struct wm831x_power *wm831x_power = dev_get_drvdata(psy->dev->parent);
393         struct wm831x *wm831x = wm831x_power->wm831x;
394         int ret = 0;
395
396         switch (psp) {
397         case POWER_SUPPLY_PROP_STATUS:
398                 ret = wm831x_bat_check_status(wm831x, &val->intval);
399                 break;
400         case POWER_SUPPLY_PROP_ONLINE:
401                 ret = wm831x_power_check_online(wm831x, WM831X_PWR_SRC_BATT,
402                                                 val);
403                 break;
404         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
405                 ret = wm831x_power_read_voltage(wm831x, WM831X_AUX_BATT, val);
406                 break;
407         case POWER_SUPPLY_PROP_HEALTH:
408                 ret = wm831x_bat_check_health(wm831x, &val->intval);
409                 break;
410         case POWER_SUPPLY_PROP_CHARGE_TYPE:
411                 ret = wm831x_bat_check_type(wm831x, &val->intval);
412                 break;
413         default:
414                 ret = -EINVAL;
415                 break;
416         }
417
418         return ret;
419 }
420
421 static enum power_supply_property wm831x_bat_props[] = {
422         POWER_SUPPLY_PROP_STATUS,
423         POWER_SUPPLY_PROP_ONLINE,
424         POWER_SUPPLY_PROP_VOLTAGE_NOW,
425         POWER_SUPPLY_PROP_HEALTH,
426         POWER_SUPPLY_PROP_CHARGE_TYPE,
427 };
428
429 static const char *wm831x_bat_irqs[] = {
430         "BATT HOT",
431         "BATT COLD",
432         "BATT FAIL",
433         "OV",
434         "END",
435         "TO",
436         "MODE",
437         "START",
438 };
439
440 static irqreturn_t wm831x_bat_irq(int irq, void *data)
441 {
442         struct wm831x_power *wm831x_power = data;
443         struct wm831x *wm831x = wm831x_power->wm831x;
444
445         dev_dbg(wm831x->dev, "Battery status changed: %d\n", irq);
446
447         /* The battery charger is autonomous so we don't need to do
448          * anything except kick user space */
449         power_supply_changed(&wm831x_power->battery);
450
451         return IRQ_HANDLED;
452 }
453
454
455 /*********************************************************************
456  *              Initialisation
457  *********************************************************************/
458
459 static irqreturn_t wm831x_syslo_irq(int irq, void *data)
460 {
461         struct wm831x_power *wm831x_power = data;
462         struct wm831x *wm831x = wm831x_power->wm831x;
463
464         /* Not much we can actually *do* but tell people for
465          * posterity, we're probably about to run out of power. */
466         dev_crit(wm831x->dev, "SYSVDD under voltage\n");
467
468         return IRQ_HANDLED;
469 }
470
471 static irqreturn_t wm831x_pwr_src_irq(int irq, void *data)
472 {
473         struct wm831x_power *wm831x_power = data;
474         struct wm831x *wm831x = wm831x_power->wm831x;
475
476         dev_dbg(wm831x->dev, "Power source changed\n");
477
478         /* Just notify for everything - little harm in overnotifying. */
479         power_supply_changed(&wm831x_power->battery);
480         power_supply_changed(&wm831x_power->usb);
481         power_supply_changed(&wm831x_power->wall);
482
483         return IRQ_HANDLED;
484 }
485
486 static __devinit int wm831x_power_probe(struct platform_device *pdev)
487 {
488         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
489         struct wm831x_power *power;
490         struct power_supply *usb;
491         struct power_supply *battery;
492         struct power_supply *wall;
493         int ret, irq, i;
494
495         power = kzalloc(sizeof(struct wm831x_power), GFP_KERNEL);
496         if (power == NULL)
497                 return -ENOMEM;
498
499         power->wm831x = wm831x;
500         platform_set_drvdata(pdev, power);
501
502         usb = &power->usb;
503         battery = &power->battery;
504         wall = &power->wall;
505
506         /* We ignore configuration failures since we can still read back
507          * the status without enabling the charger.
508          */
509         wm831x_config_battery(wm831x);
510
511         wall->name = "wm831x-wall";
512         wall->type = POWER_SUPPLY_TYPE_MAINS;
513         wall->properties = wm831x_wall_props;
514         wall->num_properties = ARRAY_SIZE(wm831x_wall_props);
515         wall->get_property = wm831x_wall_get_prop;
516         ret = power_supply_register(&pdev->dev, wall);
517         if (ret)
518                 goto err_kmalloc;
519
520         battery->name = "wm831x-battery";
521         battery->properties = wm831x_bat_props;
522         battery->num_properties = ARRAY_SIZE(wm831x_bat_props);
523         battery->get_property = wm831x_bat_get_prop;
524         battery->use_for_apm = 1;
525         ret = power_supply_register(&pdev->dev, battery);
526         if (ret)
527                 goto err_wall;
528
529         usb->name = "wm831x-usb",
530         usb->type = POWER_SUPPLY_TYPE_USB;
531         usb->properties = wm831x_usb_props;
532         usb->num_properties = ARRAY_SIZE(wm831x_usb_props);
533         usb->get_property = wm831x_usb_get_prop;
534         ret = power_supply_register(&pdev->dev, usb);
535         if (ret)
536                 goto err_battery;
537
538         irq = platform_get_irq_byname(pdev, "SYSLO");
539         ret = wm831x_request_irq(wm831x, irq, wm831x_syslo_irq,
540                                  IRQF_TRIGGER_RISING, "SYSLO",
541                                  power);
542         if (ret != 0) {
543                 dev_err(&pdev->dev, "Failed to request SYSLO IRQ %d: %d\n",
544                         irq, ret);
545                 goto err_usb;
546         }
547
548         irq = platform_get_irq_byname(pdev, "PWR SRC");
549         ret = wm831x_request_irq(wm831x, irq, wm831x_pwr_src_irq,
550                                  IRQF_TRIGGER_RISING, "Power source",
551                                  power);
552         if (ret != 0) {
553                 dev_err(&pdev->dev, "Failed to request PWR SRC IRQ %d: %d\n",
554                         irq, ret);
555                 goto err_syslo;
556         }
557
558         for (i = 0; i < ARRAY_SIZE(wm831x_bat_irqs); i++) {
559                 irq = platform_get_irq_byname(pdev, wm831x_bat_irqs[i]);
560                 ret = wm831x_request_irq(wm831x, irq, wm831x_bat_irq,
561                                          IRQF_TRIGGER_RISING,
562                                          wm831x_bat_irqs[i],
563                                          power);
564                 if (ret != 0) {
565                         dev_err(&pdev->dev,
566                                 "Failed to request %s IRQ %d: %d\n",
567                                 wm831x_bat_irqs[i], irq, ret);
568                         goto err_bat_irq;
569                 }
570         }
571
572         return ret;
573
574 err_bat_irq:
575         for (; i >= 0; i--) {
576                 irq = platform_get_irq_byname(pdev, wm831x_bat_irqs[i]);
577                 wm831x_free_irq(wm831x, irq, power);
578         }
579         irq = platform_get_irq_byname(pdev, "PWR SRC");
580         wm831x_free_irq(wm831x, irq, power);
581 err_syslo:
582         irq = platform_get_irq_byname(pdev, "SYSLO");
583         wm831x_free_irq(wm831x, irq, power);
584 err_usb:
585         power_supply_unregister(usb);
586 err_battery:
587         power_supply_unregister(battery);
588 err_wall:
589         power_supply_unregister(wall);
590 err_kmalloc:
591         kfree(power);
592         return ret;
593 }
594
595 static __devexit int wm831x_power_remove(struct platform_device *pdev)
596 {
597         struct wm831x_power *wm831x_power = platform_get_drvdata(pdev);
598         struct wm831x *wm831x = wm831x_power->wm831x;
599         int irq, i;
600
601         for (i = 0; i < ARRAY_SIZE(wm831x_bat_irqs); i++) {
602                 irq = platform_get_irq_byname(pdev, wm831x_bat_irqs[i]);
603                 wm831x_free_irq(wm831x, irq, wm831x_power);
604         }
605
606         irq = platform_get_irq_byname(pdev, "PWR SRC");
607         wm831x_free_irq(wm831x, irq, wm831x_power);
608
609         irq = platform_get_irq_byname(pdev, "SYSLO");
610         wm831x_free_irq(wm831x, irq, wm831x_power);
611
612         power_supply_unregister(&wm831x_power->battery);
613         power_supply_unregister(&wm831x_power->wall);
614         power_supply_unregister(&wm831x_power->usb);
615         return 0;
616 }
617
618 static struct platform_driver wm831x_power_driver = {
619         .probe = wm831x_power_probe,
620         .remove = __devexit_p(wm831x_power_remove),
621         .driver = {
622                 .name = "wm831x-power",
623         },
624 };
625
626 static int __init wm831x_power_init(void)
627 {
628         return platform_driver_register(&wm831x_power_driver);
629 }
630 module_init(wm831x_power_init);
631
632 static void __exit wm831x_power_exit(void)
633 {
634         platform_driver_unregister(&wm831x_power_driver);
635 }
636 module_exit(wm831x_power_exit);
637
638 MODULE_DESCRIPTION("Power supply driver for WM831x PMICs");
639 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
640 MODULE_LICENSE("GPL");
641 MODULE_ALIAS("platform:wm831x-power");