tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
22struct wm831x_power {
23 struct wm831x *wm831x;
24 struct power_supply wall;
25 struct power_supply usb;
26 struct power_supply battery;
27};
28
29static 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
46static 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 *********************************************************************/
62static 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
85static 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 *********************************************************************/
93static 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
116static 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
125struct chg_map {
126 int val;
127 int reg_val;
128};
129
130static 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
137static 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
144static 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
163static 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
174static 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
193static 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
212static 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, ®2,
243 "trickle charge current limit", "mA");
244
245 wm831x_battey_apply_config(wm831x, vsels, ARRAY_SIZE(vsels),
246 pdata->vsel, ®2,
247 "target voltage", "mV");
248
249 wm831x_battey_apply_config(wm831x, fast_ilims, ARRAY_SIZE(fast_ilims),
250 pdata->fast_ilim, ®2,
251 "fast charge current limit", "mA");
252
253 wm831x_battey_apply_config(wm831x, eoc_iterms, ARRAY_SIZE(eoc_iterms),
254 pdata->eoc_iterm, ®1,
255 "end of charge current threshold", "mA");
256
257 wm831x_battey_apply_config(wm831x, chg_times, ARRAY_SIZE(chg_times),
258 pdata->timeout, ®2,
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
290static 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
324static 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
349static 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
388static 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
421static 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
429static 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
440static 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
459static 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
471static 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
486static __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
574err_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);
581err_syslo:
582 irq = platform_get_irq_byname(pdev, "SYSLO");
583 free_irq(irq, power);
584err_usb:
585 power_supply_unregister(usb);
586err_battery:
587 power_supply_unregister(battery);
588err_wall:
589 power_supply_unregister(wall);
590err_kmalloc:
591 kfree(power);
592 return ret;
593}
594
595static __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
618static 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
626static int __init wm831x_power_init(void)
627{
628 return platform_driver_register(&wm831x_power_driver);
629}
630module_init(wm831x_power_init);
631
632static void __exit wm831x_power_exit(void)
633{
634 platform_driver_unregister(&wm831x_power_driver);
635}
636module_exit(wm831x_power_exit);
637
638MODULE_DESCRIPTION("Power supply driver for WM831x PMICs");
639MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
640MODULE_LICENSE("GPL");
641MODULE_ALIAS("platform:wm831x-power");