]> git.karo-electronics.de Git - mv-sheeva.git/blob - drivers/power/wm831x_power.c
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
[mv-sheeva.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 #include <linux/slab.h>
16
17 #include <linux/mfd/wm831x/core.h>
18 #include <linux/mfd/wm831x/auxadc.h>
19 #include <linux/mfd/wm831x/pmu.h>
20 #include <linux/mfd/wm831x/pdata.h>
21
22 struct wm831x_power {
23         struct wm831x *wm831x;
24         struct power_supply wall;
25         struct power_supply usb;
26         struct power_supply battery;
27 };
28
29 static int wm831x_power_check_online(struct wm831x *wm831x, int supply,
30                                      union power_supply_propval *val)
31 {
32         int ret;
33
34         ret = wm831x_reg_read(wm831x, WM831X_SYSTEM_STATUS);
35         if (ret < 0)
36                 return ret;
37
38         if (ret & supply)
39                 val->intval = 1;
40         else
41                 val->intval = 0;
42
43         return 0;
44 }
45
46 static int wm831x_power_read_voltage(struct wm831x *wm831x,
47                                      enum wm831x_auxadc src,
48                                      union power_supply_propval *val)
49 {
50         int ret;
51
52         ret = wm831x_auxadc_read_uv(wm831x, src);
53         if (ret >= 0)
54                 val->intval = ret;
55
56         return ret;
57 }
58
59 /*********************************************************************
60  *              WALL Power
61  *********************************************************************/
62 static int wm831x_wall_get_prop(struct power_supply *psy,
63                                 enum power_supply_property psp,
64                                 union power_supply_propval *val)
65 {
66         struct wm831x_power *wm831x_power = dev_get_drvdata(psy->dev->parent);
67         struct wm831x *wm831x = wm831x_power->wm831x;
68         int ret = 0;
69
70         switch (psp) {
71         case POWER_SUPPLY_PROP_ONLINE:
72                 ret = wm831x_power_check_online(wm831x, WM831X_PWR_WALL, val);
73                 break;
74         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
75                 ret = wm831x_power_read_voltage(wm831x, WM831X_AUX_WALL, val);
76                 break;
77         default:
78                 ret = -EINVAL;
79                 break;
80         }
81
82         return ret;
83 }
84
85 static enum power_supply_property wm831x_wall_props[] = {
86         POWER_SUPPLY_PROP_ONLINE,
87         POWER_SUPPLY_PROP_VOLTAGE_NOW,
88 };
89
90 /*********************************************************************
91  *              USB Power
92  *********************************************************************/
93 static int wm831x_usb_get_prop(struct power_supply *psy,
94                                enum power_supply_property psp,
95                                union power_supply_propval *val)
96 {
97         struct wm831x_power *wm831x_power = dev_get_drvdata(psy->dev->parent);
98         struct wm831x *wm831x = wm831x_power->wm831x;
99         int ret = 0;
100
101         switch (psp) {
102         case POWER_SUPPLY_PROP_ONLINE:
103                 ret = wm831x_power_check_online(wm831x, WM831X_PWR_USB, val);
104                 break;
105         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
106                 ret = wm831x_power_read_voltage(wm831x, WM831X_AUX_USB, val);
107                 break;
108         default:
109                 ret = -EINVAL;
110                 break;
111         }
112
113         return ret;
114 }
115
116 static enum power_supply_property wm831x_usb_props[] = {
117         POWER_SUPPLY_PROP_ONLINE,
118         POWER_SUPPLY_PROP_VOLTAGE_NOW,
119 };
120
121 /*********************************************************************
122  *              Battery properties
123  *********************************************************************/
124
125 struct chg_map {
126         int val;
127         int reg_val;
128 };
129
130 static struct chg_map trickle_ilims[] = {
131         {  50, 0 << WM831X_CHG_TRKL_ILIM_SHIFT },
132         { 100, 1 << WM831X_CHG_TRKL_ILIM_SHIFT },
133         { 150, 2 << WM831X_CHG_TRKL_ILIM_SHIFT },
134         { 200, 3 << WM831X_CHG_TRKL_ILIM_SHIFT },
135 };
136
137 static struct chg_map vsels[] = {
138         { 4050, 0 << WM831X_CHG_VSEL_SHIFT },
139         { 4100, 1 << WM831X_CHG_VSEL_SHIFT },
140         { 4150, 2 << WM831X_CHG_VSEL_SHIFT },
141         { 4200, 3 << WM831X_CHG_VSEL_SHIFT },
142 };
143
144 static struct chg_map fast_ilims[] = {
145         {    0,  0 << WM831X_CHG_FAST_ILIM_SHIFT },
146         {   50,  1 << WM831X_CHG_FAST_ILIM_SHIFT },
147         {  100,  2 << WM831X_CHG_FAST_ILIM_SHIFT },
148         {  150,  3 << WM831X_CHG_FAST_ILIM_SHIFT },
149         {  200,  4 << WM831X_CHG_FAST_ILIM_SHIFT },
150         {  250,  5 << WM831X_CHG_FAST_ILIM_SHIFT },
151         {  300,  6 << WM831X_CHG_FAST_ILIM_SHIFT },
152         {  350,  7 << WM831X_CHG_FAST_ILIM_SHIFT },
153         {  400,  8 << WM831X_CHG_FAST_ILIM_SHIFT },
154         {  450,  9 << WM831X_CHG_FAST_ILIM_SHIFT },
155         {  500, 10 << WM831X_CHG_FAST_ILIM_SHIFT },
156         {  600, 11 << WM831X_CHG_FAST_ILIM_SHIFT },
157         {  700, 12 << WM831X_CHG_FAST_ILIM_SHIFT },
158         {  800, 13 << WM831X_CHG_FAST_ILIM_SHIFT },
159         {  900, 14 << WM831X_CHG_FAST_ILIM_SHIFT },
160         { 1000, 15 << WM831X_CHG_FAST_ILIM_SHIFT },
161 };
162
163 static struct chg_map eoc_iterms[] = {
164         { 20, 0 << WM831X_CHG_ITERM_SHIFT },
165         { 30, 1 << WM831X_CHG_ITERM_SHIFT },
166         { 40, 2 << WM831X_CHG_ITERM_SHIFT },
167         { 50, 3 << WM831X_CHG_ITERM_SHIFT },
168         { 60, 4 << WM831X_CHG_ITERM_SHIFT },
169         { 70, 5 << WM831X_CHG_ITERM_SHIFT },
170         { 80, 6 << WM831X_CHG_ITERM_SHIFT },
171         { 90, 7 << WM831X_CHG_ITERM_SHIFT },
172 };
173
174 static struct chg_map chg_times[] = {
175         {  60,  0 << WM831X_CHG_TIME_SHIFT },
176         {  90,  1 << WM831X_CHG_TIME_SHIFT },
177         { 120,  2 << WM831X_CHG_TIME_SHIFT },
178         { 150,  3 << WM831X_CHG_TIME_SHIFT },
179         { 180,  4 << WM831X_CHG_TIME_SHIFT },
180         { 210,  5 << WM831X_CHG_TIME_SHIFT },
181         { 240,  6 << WM831X_CHG_TIME_SHIFT },
182         { 270,  7 << WM831X_CHG_TIME_SHIFT },
183         { 300,  8 << WM831X_CHG_TIME_SHIFT },
184         { 330,  9 << WM831X_CHG_TIME_SHIFT },
185         { 360, 10 << WM831X_CHG_TIME_SHIFT },
186         { 390, 11 << WM831X_CHG_TIME_SHIFT },
187         { 420, 12 << WM831X_CHG_TIME_SHIFT },
188         { 450, 13 << WM831X_CHG_TIME_SHIFT },
189         { 480, 14 << WM831X_CHG_TIME_SHIFT },
190         { 510, 15 << WM831X_CHG_TIME_SHIFT },
191 };
192
193 static void wm831x_battey_apply_config(struct wm831x *wm831x,
194                                        struct chg_map *map, int count, int val,
195                                        int *reg, const char *name,
196                                        const char *units)
197 {
198         int i;
199
200         for (i = 0; i < count; i++)
201                 if (val == map[i].val)
202                         break;
203         if (i == count) {
204                 dev_err(wm831x->dev, "Invalid %s %d%s\n",
205                         name, val, units);
206         } else {
207                 *reg |= map[i].reg_val;
208                 dev_dbg(wm831x->dev, "Set %s of %d%s\n", name, val, units);
209         }
210 }
211
212 static void wm831x_config_battery(struct wm831x *wm831x)
213 {
214         struct wm831x_pdata *wm831x_pdata = wm831x->dev->platform_data;
215         struct wm831x_battery_pdata *pdata;
216         int ret, reg1, reg2;
217
218         if (!wm831x_pdata || !wm831x_pdata->battery) {
219                 dev_warn(wm831x->dev,
220                          "No battery charger configuration\n");
221                 return;
222         }
223
224         pdata = wm831x_pdata->battery;
225
226         reg1 = 0;
227         reg2 = 0;
228
229         if (!pdata->enable) {
230                 dev_info(wm831x->dev, "Battery charger disabled\n");
231                 return;
232         }
233
234         reg1 |= WM831X_CHG_ENA;
235         if (pdata->off_mask)
236                 reg2 |= WM831X_CHG_OFF_MSK;
237         if (pdata->fast_enable)
238                 reg1 |= WM831X_CHG_FAST;
239
240         wm831x_battey_apply_config(wm831x, trickle_ilims,
241                                    ARRAY_SIZE(trickle_ilims),
242                                    pdata->trickle_ilim, &reg2,
243                                    "trickle charge current limit", "mA");
244
245         wm831x_battey_apply_config(wm831x, vsels, ARRAY_SIZE(vsels),
246                                    pdata->vsel, &reg2,
247                                    "target voltage", "mV");
248
249         wm831x_battey_apply_config(wm831x, fast_ilims, ARRAY_SIZE(fast_ilims),
250                                    pdata->fast_ilim, &reg2,
251                                    "fast charge current limit", "mA");
252
253         wm831x_battey_apply_config(wm831x, eoc_iterms, ARRAY_SIZE(eoc_iterms),
254                                    pdata->eoc_iterm, &reg1,
255                                    "end of charge current threshold", "mA");
256
257         wm831x_battey_apply_config(wm831x, chg_times, ARRAY_SIZE(chg_times),
258                                    pdata->timeout, &reg2,
259                                    "charger timeout", "min");
260
261         ret = wm831x_reg_unlock(wm831x);
262         if (ret != 0) {
263                 dev_err(wm831x->dev, "Failed to unlock registers: %d\n", ret);
264                 return;
265         }
266
267         ret = wm831x_set_bits(wm831x, WM831X_CHARGER_CONTROL_1,
268                               WM831X_CHG_ENA_MASK |
269                               WM831X_CHG_FAST_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 = request_threaded_irq(irq, NULL, wm831x_syslo_irq,
540                                    IRQF_TRIGGER_RISING, "System power low",
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 = request_threaded_irq(irq, NULL, 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 = request_threaded_irq(irq, NULL, 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                 free_irq(irq, power);
578         }
579         irq = platform_get_irq_byname(pdev, "PWR SRC");
580         free_irq(irq, power);
581 err_syslo:
582         irq = platform_get_irq_byname(pdev, "SYSLO");
583         free_irq(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         int irq, i;
599
600         for (i = 0; i < ARRAY_SIZE(wm831x_bat_irqs); i++) {
601                 irq = platform_get_irq_byname(pdev, wm831x_bat_irqs[i]);
602                 free_irq(irq, wm831x_power);
603         }
604
605         irq = platform_get_irq_byname(pdev, "PWR SRC");
606         free_irq(irq, wm831x_power);
607
608         irq = platform_get_irq_byname(pdev, "SYSLO");
609         free_irq(irq, wm831x_power);
610
611         power_supply_unregister(&wm831x_power->battery);
612         power_supply_unregister(&wm831x_power->wall);
613         power_supply_unregister(&wm831x_power->usb);
614         kfree(wm831x_power);
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");