2 * PMU driver for Wolfson Microelectronics wm831x PMICs
4 * Copyright 2009 Wolfson Microelectronics PLC.
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.
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>
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>
23 struct wm831x *wm831x;
24 struct power_supply wall;
25 struct power_supply usb;
26 struct power_supply battery;
29 static int wm831x_power_check_online(struct wm831x *wm831x, int supply,
30 union power_supply_propval *val)
34 ret = wm831x_reg_read(wm831x, WM831X_SYSTEM_STATUS);
46 static int wm831x_power_read_voltage(struct wm831x *wm831x,
47 enum wm831x_auxadc src,
48 union power_supply_propval *val)
52 ret = wm831x_auxadc_read_uv(wm831x, src);
59 /*********************************************************************
61 *********************************************************************/
62 static int wm831x_wall_get_prop(struct power_supply *psy,
63 enum power_supply_property psp,
64 union power_supply_propval *val)
66 struct wm831x_power *wm831x_power = dev_get_drvdata(psy->dev->parent);
67 struct wm831x *wm831x = wm831x_power->wm831x;
71 case POWER_SUPPLY_PROP_ONLINE:
72 ret = wm831x_power_check_online(wm831x, WM831X_PWR_WALL, val);
74 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
75 ret = wm831x_power_read_voltage(wm831x, WM831X_AUX_WALL, val);
85 static enum power_supply_property wm831x_wall_props[] = {
86 POWER_SUPPLY_PROP_ONLINE,
87 POWER_SUPPLY_PROP_VOLTAGE_NOW,
90 /*********************************************************************
92 *********************************************************************/
93 static int wm831x_usb_get_prop(struct power_supply *psy,
94 enum power_supply_property psp,
95 union power_supply_propval *val)
97 struct wm831x_power *wm831x_power = dev_get_drvdata(psy->dev->parent);
98 struct wm831x *wm831x = wm831x_power->wm831x;
102 case POWER_SUPPLY_PROP_ONLINE:
103 ret = wm831x_power_check_online(wm831x, WM831X_PWR_USB, val);
105 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
106 ret = wm831x_power_read_voltage(wm831x, WM831X_AUX_USB, val);
116 static enum power_supply_property wm831x_usb_props[] = {
117 POWER_SUPPLY_PROP_ONLINE,
118 POWER_SUPPLY_PROP_VOLTAGE_NOW,
121 /*********************************************************************
123 *********************************************************************/
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 },
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 },
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 },
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 },
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 },
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,
200 for (i = 0; i < count; i++)
201 if (val == map[i].val)
204 dev_err(wm831x->dev, "Invalid %s %d%s\n",
207 *reg |= map[i].reg_val;
208 dev_dbg(wm831x->dev, "Set %s of %d%s\n", name, val, units);
212 static void wm831x_config_battery(struct wm831x *wm831x)
214 struct wm831x_pdata *wm831x_pdata = wm831x->dev->platform_data;
215 struct wm831x_battery_pdata *pdata;
218 if (!wm831x_pdata || !wm831x_pdata->battery) {
219 dev_warn(wm831x->dev,
220 "No battery charger configuration\n");
224 pdata = wm831x_pdata->battery;
229 if (!pdata->enable) {
230 dev_info(wm831x->dev, "Battery charger disabled\n");
234 reg1 |= WM831X_CHG_ENA;
236 reg2 |= WM831X_CHG_OFF_MSK;
237 if (pdata->fast_enable)
238 reg1 |= WM831X_CHG_FAST;
240 wm831x_battey_apply_config(wm831x, trickle_ilims,
241 ARRAY_SIZE(trickle_ilims),
242 pdata->trickle_ilim, ®2,
243 "trickle charge current limit", "mA");
245 wm831x_battey_apply_config(wm831x, vsels, ARRAY_SIZE(vsels),
247 "target voltage", "mV");
249 wm831x_battey_apply_config(wm831x, fast_ilims, ARRAY_SIZE(fast_ilims),
250 pdata->fast_ilim, ®2,
251 "fast charge current limit", "mA");
253 wm831x_battey_apply_config(wm831x, eoc_iterms, ARRAY_SIZE(eoc_iterms),
254 pdata->eoc_iterm, ®1,
255 "end of charge current threshold", "mA");
257 wm831x_battey_apply_config(wm831x, chg_times, ARRAY_SIZE(chg_times),
258 pdata->timeout, ®2,
259 "charger timeout", "min");
261 ret = wm831x_reg_unlock(wm831x);
263 dev_err(wm831x->dev, "Failed to unlock registers: %d\n", ret);
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 WM831X_CHG_ITERM_MASK,
274 dev_err(wm831x->dev, "Failed to set charger control 1: %d\n",
277 ret = wm831x_set_bits(wm831x, WM831X_CHARGER_CONTROL_2,
279 WM831X_CHG_TIME_MASK |
280 WM831X_CHG_FAST_ILIM_MASK |
281 WM831X_CHG_TRKL_ILIM_MASK |
282 WM831X_CHG_VSEL_MASK,
285 dev_err(wm831x->dev, "Failed to set charger control 2: %d\n",
288 wm831x_reg_lock(wm831x);
291 static int wm831x_bat_check_status(struct wm831x *wm831x, int *status)
295 ret = wm831x_reg_read(wm831x, WM831X_SYSTEM_STATUS);
299 if (ret & WM831X_PWR_SRC_BATT) {
300 *status = POWER_SUPPLY_STATUS_DISCHARGING;
304 ret = wm831x_reg_read(wm831x, WM831X_CHARGER_STATUS);
308 switch (ret & WM831X_CHG_STATE_MASK) {
309 case WM831X_CHG_STATE_OFF:
310 *status = POWER_SUPPLY_STATUS_NOT_CHARGING;
312 case WM831X_CHG_STATE_TRICKLE:
313 case WM831X_CHG_STATE_FAST:
314 *status = POWER_SUPPLY_STATUS_CHARGING;
318 *status = POWER_SUPPLY_STATUS_UNKNOWN;
325 static int wm831x_bat_check_type(struct wm831x *wm831x, int *type)
329 ret = wm831x_reg_read(wm831x, WM831X_CHARGER_STATUS);
333 switch (ret & WM831X_CHG_STATE_MASK) {
334 case WM831X_CHG_STATE_TRICKLE:
335 case WM831X_CHG_STATE_TRICKLE_OT:
336 *type = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
338 case WM831X_CHG_STATE_FAST:
339 case WM831X_CHG_STATE_FAST_OT:
340 *type = POWER_SUPPLY_CHARGE_TYPE_FAST;
343 *type = POWER_SUPPLY_CHARGE_TYPE_NONE;
350 static int wm831x_bat_check_health(struct wm831x *wm831x, int *health)
354 ret = wm831x_reg_read(wm831x, WM831X_CHARGER_STATUS);
358 if (ret & WM831X_BATT_HOT_STS) {
359 *health = POWER_SUPPLY_HEALTH_OVERHEAT;
363 if (ret & WM831X_BATT_COLD_STS) {
364 *health = POWER_SUPPLY_HEALTH_COLD;
368 if (ret & WM831X_BATT_OV_STS) {
369 *health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
373 switch (ret & WM831X_CHG_STATE_MASK) {
374 case WM831X_CHG_STATE_TRICKLE_OT:
375 case WM831X_CHG_STATE_FAST_OT:
376 *health = POWER_SUPPLY_HEALTH_OVERHEAT;
378 case WM831X_CHG_STATE_DEFECTIVE:
379 *health = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
382 *health = POWER_SUPPLY_HEALTH_GOOD;
389 static int wm831x_bat_get_prop(struct power_supply *psy,
390 enum power_supply_property psp,
391 union power_supply_propval *val)
393 struct wm831x_power *wm831x_power = dev_get_drvdata(psy->dev->parent);
394 struct wm831x *wm831x = wm831x_power->wm831x;
398 case POWER_SUPPLY_PROP_STATUS:
399 ret = wm831x_bat_check_status(wm831x, &val->intval);
401 case POWER_SUPPLY_PROP_ONLINE:
402 ret = wm831x_power_check_online(wm831x, WM831X_PWR_SRC_BATT,
405 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
406 ret = wm831x_power_read_voltage(wm831x, WM831X_AUX_BATT, val);
408 case POWER_SUPPLY_PROP_HEALTH:
409 ret = wm831x_bat_check_health(wm831x, &val->intval);
411 case POWER_SUPPLY_PROP_CHARGE_TYPE:
412 ret = wm831x_bat_check_type(wm831x, &val->intval);
422 static enum power_supply_property wm831x_bat_props[] = {
423 POWER_SUPPLY_PROP_STATUS,
424 POWER_SUPPLY_PROP_ONLINE,
425 POWER_SUPPLY_PROP_VOLTAGE_NOW,
426 POWER_SUPPLY_PROP_HEALTH,
427 POWER_SUPPLY_PROP_CHARGE_TYPE,
430 static const char *wm831x_bat_irqs[] = {
441 static irqreturn_t wm831x_bat_irq(int irq, void *data)
443 struct wm831x_power *wm831x_power = data;
444 struct wm831x *wm831x = wm831x_power->wm831x;
446 dev_dbg(wm831x->dev, "Battery status changed: %d\n", irq);
448 /* The battery charger is autonomous so we don't need to do
449 * anything except kick user space */
450 power_supply_changed(&wm831x_power->battery);
456 /*********************************************************************
458 *********************************************************************/
460 static irqreturn_t wm831x_syslo_irq(int irq, void *data)
462 struct wm831x_power *wm831x_power = data;
463 struct wm831x *wm831x = wm831x_power->wm831x;
465 /* Not much we can actually *do* but tell people for
466 * posterity, we're probably about to run out of power. */
467 dev_crit(wm831x->dev, "SYSVDD under voltage\n");
472 static irqreturn_t wm831x_pwr_src_irq(int irq, void *data)
474 struct wm831x_power *wm831x_power = data;
475 struct wm831x *wm831x = wm831x_power->wm831x;
477 dev_dbg(wm831x->dev, "Power source changed\n");
479 /* Just notify for everything - little harm in overnotifying. */
480 power_supply_changed(&wm831x_power->battery);
481 power_supply_changed(&wm831x_power->usb);
482 power_supply_changed(&wm831x_power->wall);
487 static __devinit int wm831x_power_probe(struct platform_device *pdev)
489 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
490 struct wm831x_power *power;
491 struct power_supply *usb;
492 struct power_supply *battery;
493 struct power_supply *wall;
496 power = kzalloc(sizeof(struct wm831x_power), GFP_KERNEL);
500 power->wm831x = wm831x;
501 platform_set_drvdata(pdev, power);
504 battery = &power->battery;
507 /* We ignore configuration failures since we can still read back
508 * the status without enabling the charger.
510 wm831x_config_battery(wm831x);
512 wall->name = "wm831x-wall";
513 wall->type = POWER_SUPPLY_TYPE_MAINS;
514 wall->properties = wm831x_wall_props;
515 wall->num_properties = ARRAY_SIZE(wm831x_wall_props);
516 wall->get_property = wm831x_wall_get_prop;
517 ret = power_supply_register(&pdev->dev, wall);
521 battery->name = "wm831x-battery";
522 battery->properties = wm831x_bat_props;
523 battery->num_properties = ARRAY_SIZE(wm831x_bat_props);
524 battery->get_property = wm831x_bat_get_prop;
525 battery->use_for_apm = 1;
526 ret = power_supply_register(&pdev->dev, battery);
530 usb->name = "wm831x-usb",
531 usb->type = POWER_SUPPLY_TYPE_USB;
532 usb->properties = wm831x_usb_props;
533 usb->num_properties = ARRAY_SIZE(wm831x_usb_props);
534 usb->get_property = wm831x_usb_get_prop;
535 ret = power_supply_register(&pdev->dev, usb);
539 irq = platform_get_irq_byname(pdev, "SYSLO");
540 ret = request_threaded_irq(irq, NULL, wm831x_syslo_irq,
541 IRQF_TRIGGER_RISING, "System power low",
544 dev_err(&pdev->dev, "Failed to request SYSLO IRQ %d: %d\n",
549 irq = platform_get_irq_byname(pdev, "PWR SRC");
550 ret = request_threaded_irq(irq, NULL, wm831x_pwr_src_irq,
551 IRQF_TRIGGER_RISING, "Power source",
554 dev_err(&pdev->dev, "Failed to request PWR SRC IRQ %d: %d\n",
559 for (i = 0; i < ARRAY_SIZE(wm831x_bat_irqs); i++) {
560 irq = platform_get_irq_byname(pdev, wm831x_bat_irqs[i]);
561 ret = request_threaded_irq(irq, NULL, wm831x_bat_irq,
567 "Failed to request %s IRQ %d: %d\n",
568 wm831x_bat_irqs[i], irq, ret);
576 for (; i >= 0; i--) {
577 irq = platform_get_irq_byname(pdev, wm831x_bat_irqs[i]);
578 free_irq(irq, power);
580 irq = platform_get_irq_byname(pdev, "PWR SRC");
581 free_irq(irq, power);
583 irq = platform_get_irq_byname(pdev, "SYSLO");
584 free_irq(irq, power);
586 power_supply_unregister(usb);
588 power_supply_unregister(battery);
590 power_supply_unregister(wall);
596 static __devexit int wm831x_power_remove(struct platform_device *pdev)
598 struct wm831x_power *wm831x_power = platform_get_drvdata(pdev);
601 for (i = 0; i < ARRAY_SIZE(wm831x_bat_irqs); i++) {
602 irq = platform_get_irq_byname(pdev, wm831x_bat_irqs[i]);
603 free_irq(irq, wm831x_power);
606 irq = platform_get_irq_byname(pdev, "PWR SRC");
607 free_irq(irq, wm831x_power);
609 irq = platform_get_irq_byname(pdev, "SYSLO");
610 free_irq(irq, wm831x_power);
612 power_supply_unregister(&wm831x_power->battery);
613 power_supply_unregister(&wm831x_power->wall);
614 power_supply_unregister(&wm831x_power->usb);
618 static struct platform_driver wm831x_power_driver = {
619 .probe = wm831x_power_probe,
620 .remove = __devexit_p(wm831x_power_remove),
622 .name = "wm831x-power",
626 static int __init wm831x_power_init(void)
628 return platform_driver_register(&wm831x_power_driver);
630 module_init(wm831x_power_init);
632 static void __exit wm831x_power_exit(void)
634 platform_driver_unregister(&wm831x_power_driver);
636 module_exit(wm831x_power_exit);
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");