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>
16 #include <linux/usb/phy.h>
18 #include <linux/mfd/wm831x/core.h>
19 #include <linux/mfd/wm831x/auxadc.h>
20 #include <linux/mfd/wm831x/pmu.h>
21 #include <linux/mfd/wm831x/pdata.h>
24 struct wm831x *wm831x;
25 struct power_supply *wall;
26 struct power_supply *usb;
27 struct power_supply *battery;
28 struct power_supply_desc wall_desc;
29 struct power_supply_desc usb_desc;
30 struct power_supply_desc battery_desc;
33 char battery_name[20];
35 struct usb_phy *usb_phy;
36 struct notifier_block usb_notify;
39 static int wm831x_power_check_online(struct wm831x *wm831x, int supply,
40 union power_supply_propval *val)
44 ret = wm831x_reg_read(wm831x, WM831X_SYSTEM_STATUS);
56 static int wm831x_power_read_voltage(struct wm831x *wm831x,
57 enum wm831x_auxadc src,
58 union power_supply_propval *val)
62 ret = wm831x_auxadc_read_uv(wm831x, src);
69 /*********************************************************************
71 *********************************************************************/
72 static int wm831x_wall_get_prop(struct power_supply *psy,
73 enum power_supply_property psp,
74 union power_supply_propval *val)
76 struct wm831x_power *wm831x_power = dev_get_drvdata(psy->dev.parent);
77 struct wm831x *wm831x = wm831x_power->wm831x;
81 case POWER_SUPPLY_PROP_ONLINE:
82 ret = wm831x_power_check_online(wm831x, WM831X_PWR_WALL, val);
84 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
85 ret = wm831x_power_read_voltage(wm831x, WM831X_AUX_WALL, val);
95 static enum power_supply_property wm831x_wall_props[] = {
96 POWER_SUPPLY_PROP_ONLINE,
97 POWER_SUPPLY_PROP_VOLTAGE_NOW,
100 /*********************************************************************
102 *********************************************************************/
103 static int wm831x_usb_get_prop(struct power_supply *psy,
104 enum power_supply_property psp,
105 union power_supply_propval *val)
107 struct wm831x_power *wm831x_power = dev_get_drvdata(psy->dev.parent);
108 struct wm831x *wm831x = wm831x_power->wm831x;
112 case POWER_SUPPLY_PROP_ONLINE:
113 ret = wm831x_power_check_online(wm831x, WM831X_PWR_USB, val);
115 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
116 ret = wm831x_power_read_voltage(wm831x, WM831X_AUX_USB, val);
126 static enum power_supply_property wm831x_usb_props[] = {
127 POWER_SUPPLY_PROP_ONLINE,
128 POWER_SUPPLY_PROP_VOLTAGE_NOW,
132 static const unsigned int wm831x_usb_limits[] = {
143 static int wm831x_usb_limit_change(struct notifier_block *nb,
144 unsigned long limit, void *data)
146 struct wm831x_power *wm831x_power = container_of(nb,
149 unsigned int i, best;
151 /* Find the highest supported limit */
153 for (i = 0; i < ARRAY_SIZE(wm831x_usb_limits); i++) {
154 if (limit >= wm831x_usb_limits[i] &&
155 wm831x_usb_limits[best] < wm831x_usb_limits[i])
159 dev_dbg(wm831x_power->wm831x->dev,
160 "Limiting USB current to %umA", wm831x_usb_limits[best]);
162 wm831x_set_bits(wm831x_power->wm831x, WM831X_POWER_STATE,
163 WM831X_USB_ILIM_MASK, best);
168 /*********************************************************************
170 *********************************************************************/
177 static struct chg_map trickle_ilims[] = {
178 { 50, 0 << WM831X_CHG_TRKL_ILIM_SHIFT },
179 { 100, 1 << WM831X_CHG_TRKL_ILIM_SHIFT },
180 { 150, 2 << WM831X_CHG_TRKL_ILIM_SHIFT },
181 { 200, 3 << WM831X_CHG_TRKL_ILIM_SHIFT },
184 static struct chg_map vsels[] = {
185 { 4050, 0 << WM831X_CHG_VSEL_SHIFT },
186 { 4100, 1 << WM831X_CHG_VSEL_SHIFT },
187 { 4150, 2 << WM831X_CHG_VSEL_SHIFT },
188 { 4200, 3 << WM831X_CHG_VSEL_SHIFT },
191 static struct chg_map fast_ilims[] = {
192 { 0, 0 << WM831X_CHG_FAST_ILIM_SHIFT },
193 { 50, 1 << WM831X_CHG_FAST_ILIM_SHIFT },
194 { 100, 2 << WM831X_CHG_FAST_ILIM_SHIFT },
195 { 150, 3 << WM831X_CHG_FAST_ILIM_SHIFT },
196 { 200, 4 << WM831X_CHG_FAST_ILIM_SHIFT },
197 { 250, 5 << WM831X_CHG_FAST_ILIM_SHIFT },
198 { 300, 6 << WM831X_CHG_FAST_ILIM_SHIFT },
199 { 350, 7 << WM831X_CHG_FAST_ILIM_SHIFT },
200 { 400, 8 << WM831X_CHG_FAST_ILIM_SHIFT },
201 { 450, 9 << WM831X_CHG_FAST_ILIM_SHIFT },
202 { 500, 10 << WM831X_CHG_FAST_ILIM_SHIFT },
203 { 600, 11 << WM831X_CHG_FAST_ILIM_SHIFT },
204 { 700, 12 << WM831X_CHG_FAST_ILIM_SHIFT },
205 { 800, 13 << WM831X_CHG_FAST_ILIM_SHIFT },
206 { 900, 14 << WM831X_CHG_FAST_ILIM_SHIFT },
207 { 1000, 15 << WM831X_CHG_FAST_ILIM_SHIFT },
210 static struct chg_map eoc_iterms[] = {
211 { 20, 0 << WM831X_CHG_ITERM_SHIFT },
212 { 30, 1 << WM831X_CHG_ITERM_SHIFT },
213 { 40, 2 << WM831X_CHG_ITERM_SHIFT },
214 { 50, 3 << WM831X_CHG_ITERM_SHIFT },
215 { 60, 4 << WM831X_CHG_ITERM_SHIFT },
216 { 70, 5 << WM831X_CHG_ITERM_SHIFT },
217 { 80, 6 << WM831X_CHG_ITERM_SHIFT },
218 { 90, 7 << WM831X_CHG_ITERM_SHIFT },
221 static struct chg_map chg_times[] = {
222 { 60, 0 << WM831X_CHG_TIME_SHIFT },
223 { 90, 1 << WM831X_CHG_TIME_SHIFT },
224 { 120, 2 << WM831X_CHG_TIME_SHIFT },
225 { 150, 3 << WM831X_CHG_TIME_SHIFT },
226 { 180, 4 << WM831X_CHG_TIME_SHIFT },
227 { 210, 5 << WM831X_CHG_TIME_SHIFT },
228 { 240, 6 << WM831X_CHG_TIME_SHIFT },
229 { 270, 7 << WM831X_CHG_TIME_SHIFT },
230 { 300, 8 << WM831X_CHG_TIME_SHIFT },
231 { 330, 9 << WM831X_CHG_TIME_SHIFT },
232 { 360, 10 << WM831X_CHG_TIME_SHIFT },
233 { 390, 11 << WM831X_CHG_TIME_SHIFT },
234 { 420, 12 << WM831X_CHG_TIME_SHIFT },
235 { 450, 13 << WM831X_CHG_TIME_SHIFT },
236 { 480, 14 << WM831X_CHG_TIME_SHIFT },
237 { 510, 15 << WM831X_CHG_TIME_SHIFT },
240 static void wm831x_battey_apply_config(struct wm831x *wm831x,
241 struct chg_map *map, int count, int val,
242 int *reg, const char *name,
247 for (i = 0; i < count; i++)
248 if (val == map[i].val)
251 dev_err(wm831x->dev, "Invalid %s %d%s\n",
254 *reg |= map[i].reg_val;
255 dev_dbg(wm831x->dev, "Set %s of %d%s\n", name, val, units);
259 static void wm831x_config_battery(struct wm831x *wm831x)
261 struct wm831x_pdata *wm831x_pdata = wm831x->dev->platform_data;
262 struct wm831x_battery_pdata *pdata;
265 if (!wm831x_pdata || !wm831x_pdata->battery) {
266 dev_warn(wm831x->dev,
267 "No battery charger configuration\n");
271 pdata = wm831x_pdata->battery;
276 if (!pdata->enable) {
277 dev_info(wm831x->dev, "Battery charger disabled\n");
281 reg1 |= WM831X_CHG_ENA;
283 reg2 |= WM831X_CHG_OFF_MSK;
284 if (pdata->fast_enable)
285 reg1 |= WM831X_CHG_FAST;
287 wm831x_battey_apply_config(wm831x, trickle_ilims,
288 ARRAY_SIZE(trickle_ilims),
289 pdata->trickle_ilim, ®2,
290 "trickle charge current limit", "mA");
292 wm831x_battey_apply_config(wm831x, vsels, ARRAY_SIZE(vsels),
294 "target voltage", "mV");
296 wm831x_battey_apply_config(wm831x, fast_ilims, ARRAY_SIZE(fast_ilims),
297 pdata->fast_ilim, ®2,
298 "fast charge current limit", "mA");
300 wm831x_battey_apply_config(wm831x, eoc_iterms, ARRAY_SIZE(eoc_iterms),
301 pdata->eoc_iterm, ®1,
302 "end of charge current threshold", "mA");
304 wm831x_battey_apply_config(wm831x, chg_times, ARRAY_SIZE(chg_times),
305 pdata->timeout, ®2,
306 "charger timeout", "min");
308 ret = wm831x_reg_unlock(wm831x);
310 dev_err(wm831x->dev, "Failed to unlock registers: %d\n", ret);
314 ret = wm831x_set_bits(wm831x, WM831X_CHARGER_CONTROL_1,
315 WM831X_CHG_ENA_MASK |
316 WM831X_CHG_FAST_MASK |
317 WM831X_CHG_ITERM_MASK,
320 dev_err(wm831x->dev, "Failed to set charger control 1: %d\n",
323 ret = wm831x_set_bits(wm831x, WM831X_CHARGER_CONTROL_2,
325 WM831X_CHG_TIME_MASK |
326 WM831X_CHG_FAST_ILIM_MASK |
327 WM831X_CHG_TRKL_ILIM_MASK |
328 WM831X_CHG_VSEL_MASK,
331 dev_err(wm831x->dev, "Failed to set charger control 2: %d\n",
334 wm831x_reg_lock(wm831x);
337 static int wm831x_bat_check_status(struct wm831x *wm831x, int *status)
341 ret = wm831x_reg_read(wm831x, WM831X_SYSTEM_STATUS);
345 if (ret & WM831X_PWR_SRC_BATT) {
346 *status = POWER_SUPPLY_STATUS_DISCHARGING;
350 ret = wm831x_reg_read(wm831x, WM831X_CHARGER_STATUS);
354 switch (ret & WM831X_CHG_STATE_MASK) {
355 case WM831X_CHG_STATE_OFF:
356 *status = POWER_SUPPLY_STATUS_NOT_CHARGING;
358 case WM831X_CHG_STATE_TRICKLE:
359 case WM831X_CHG_STATE_FAST:
360 *status = POWER_SUPPLY_STATUS_CHARGING;
364 *status = POWER_SUPPLY_STATUS_UNKNOWN;
371 static int wm831x_bat_check_type(struct wm831x *wm831x, int *type)
375 ret = wm831x_reg_read(wm831x, WM831X_CHARGER_STATUS);
379 switch (ret & WM831X_CHG_STATE_MASK) {
380 case WM831X_CHG_STATE_TRICKLE:
381 case WM831X_CHG_STATE_TRICKLE_OT:
382 *type = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
384 case WM831X_CHG_STATE_FAST:
385 case WM831X_CHG_STATE_FAST_OT:
386 *type = POWER_SUPPLY_CHARGE_TYPE_FAST;
389 *type = POWER_SUPPLY_CHARGE_TYPE_NONE;
396 static int wm831x_bat_check_health(struct wm831x *wm831x, int *health)
400 ret = wm831x_reg_read(wm831x, WM831X_CHARGER_STATUS);
404 if (ret & WM831X_BATT_HOT_STS) {
405 *health = POWER_SUPPLY_HEALTH_OVERHEAT;
409 if (ret & WM831X_BATT_COLD_STS) {
410 *health = POWER_SUPPLY_HEALTH_COLD;
414 if (ret & WM831X_BATT_OV_STS) {
415 *health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
419 switch (ret & WM831X_CHG_STATE_MASK) {
420 case WM831X_CHG_STATE_TRICKLE_OT:
421 case WM831X_CHG_STATE_FAST_OT:
422 *health = POWER_SUPPLY_HEALTH_OVERHEAT;
424 case WM831X_CHG_STATE_DEFECTIVE:
425 *health = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
428 *health = POWER_SUPPLY_HEALTH_GOOD;
435 static int wm831x_bat_get_prop(struct power_supply *psy,
436 enum power_supply_property psp,
437 union power_supply_propval *val)
439 struct wm831x_power *wm831x_power = dev_get_drvdata(psy->dev.parent);
440 struct wm831x *wm831x = wm831x_power->wm831x;
444 case POWER_SUPPLY_PROP_STATUS:
445 ret = wm831x_bat_check_status(wm831x, &val->intval);
447 case POWER_SUPPLY_PROP_ONLINE:
448 ret = wm831x_power_check_online(wm831x, WM831X_PWR_SRC_BATT,
451 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
452 ret = wm831x_power_read_voltage(wm831x, WM831X_AUX_BATT, val);
454 case POWER_SUPPLY_PROP_HEALTH:
455 ret = wm831x_bat_check_health(wm831x, &val->intval);
457 case POWER_SUPPLY_PROP_CHARGE_TYPE:
458 ret = wm831x_bat_check_type(wm831x, &val->intval);
468 static enum power_supply_property wm831x_bat_props[] = {
469 POWER_SUPPLY_PROP_STATUS,
470 POWER_SUPPLY_PROP_ONLINE,
471 POWER_SUPPLY_PROP_VOLTAGE_NOW,
472 POWER_SUPPLY_PROP_HEALTH,
473 POWER_SUPPLY_PROP_CHARGE_TYPE,
476 static const char *wm831x_bat_irqs[] = {
487 static irqreturn_t wm831x_bat_irq(int irq, void *data)
489 struct wm831x_power *wm831x_power = data;
490 struct wm831x *wm831x = wm831x_power->wm831x;
492 dev_dbg(wm831x->dev, "Battery status changed: %d\n", irq);
494 /* The battery charger is autonomous so we don't need to do
495 * anything except kick user space */
496 if (wm831x_power->have_battery)
497 power_supply_changed(wm831x_power->battery);
503 /*********************************************************************
505 *********************************************************************/
507 static irqreturn_t wm831x_syslo_irq(int irq, void *data)
509 struct wm831x_power *wm831x_power = data;
510 struct wm831x *wm831x = wm831x_power->wm831x;
512 /* Not much we can actually *do* but tell people for
513 * posterity, we're probably about to run out of power. */
514 dev_crit(wm831x->dev, "SYSVDD under voltage\n");
519 static irqreturn_t wm831x_pwr_src_irq(int irq, void *data)
521 struct wm831x_power *wm831x_power = data;
522 struct wm831x *wm831x = wm831x_power->wm831x;
524 dev_dbg(wm831x->dev, "Power source changed\n");
526 /* Just notify for everything - little harm in overnotifying. */
527 if (wm831x_power->have_battery)
528 power_supply_changed(wm831x_power->battery);
529 power_supply_changed(wm831x_power->usb);
530 power_supply_changed(wm831x_power->wall);
535 static int wm831x_power_probe(struct platform_device *pdev)
537 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
538 struct wm831x_pdata *wm831x_pdata = wm831x->dev->platform_data;
539 struct wm831x_power *power;
542 power = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_power),
547 power->wm831x = wm831x;
548 platform_set_drvdata(pdev, power);
550 if (wm831x_pdata && wm831x_pdata->wm831x_num) {
551 snprintf(power->wall_name, sizeof(power->wall_name),
552 "wm831x-wall.%d", wm831x_pdata->wm831x_num);
553 snprintf(power->battery_name, sizeof(power->wall_name),
554 "wm831x-battery.%d", wm831x_pdata->wm831x_num);
555 snprintf(power->usb_name, sizeof(power->wall_name),
556 "wm831x-usb.%d", wm831x_pdata->wm831x_num);
558 snprintf(power->wall_name, sizeof(power->wall_name),
560 snprintf(power->battery_name, sizeof(power->wall_name),
562 snprintf(power->usb_name, sizeof(power->wall_name),
566 /* We ignore configuration failures since we can still read back
567 * the status without enabling the charger.
569 wm831x_config_battery(wm831x);
571 power->wall_desc.name = power->wall_name;
572 power->wall_desc.type = POWER_SUPPLY_TYPE_MAINS;
573 power->wall_desc.properties = wm831x_wall_props;
574 power->wall_desc.num_properties = ARRAY_SIZE(wm831x_wall_props);
575 power->wall_desc.get_property = wm831x_wall_get_prop;
576 power->wall = power_supply_register(&pdev->dev, &power->wall_desc,
578 if (IS_ERR(power->wall)) {
579 ret = PTR_ERR(power->wall);
583 power->usb_desc.name = power->usb_name,
584 power->usb_desc.type = POWER_SUPPLY_TYPE_USB;
585 power->usb_desc.properties = wm831x_usb_props;
586 power->usb_desc.num_properties = ARRAY_SIZE(wm831x_usb_props);
587 power->usb_desc.get_property = wm831x_usb_get_prop;
588 power->usb = power_supply_register(&pdev->dev, &power->usb_desc, NULL);
589 if (IS_ERR(power->usb)) {
590 ret = PTR_ERR(power->usb);
594 ret = wm831x_reg_read(wm831x, WM831X_CHARGER_CONTROL_1);
597 power->have_battery = ret & WM831X_CHG_ENA;
599 if (power->have_battery) {
600 power->battery_desc.name = power->battery_name;
601 power->battery_desc.properties = wm831x_bat_props;
602 power->battery_desc.num_properties = ARRAY_SIZE(wm831x_bat_props);
603 power->battery_desc.get_property = wm831x_bat_get_prop;
604 power->battery_desc.use_for_apm = 1;
605 power->battery = power_supply_register(&pdev->dev,
606 &power->battery_desc,
608 if (IS_ERR(power->battery)) {
609 ret = PTR_ERR(power->battery);
614 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "SYSLO"));
615 ret = request_threaded_irq(irq, NULL, wm831x_syslo_irq,
616 IRQF_TRIGGER_RISING | IRQF_ONESHOT, "System power low",
619 dev_err(&pdev->dev, "Failed to request SYSLO IRQ %d: %d\n",
624 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "PWR SRC"));
625 ret = request_threaded_irq(irq, NULL, wm831x_pwr_src_irq,
626 IRQF_TRIGGER_RISING | IRQF_ONESHOT, "Power source",
629 dev_err(&pdev->dev, "Failed to request PWR SRC IRQ %d: %d\n",
634 for (i = 0; i < ARRAY_SIZE(wm831x_bat_irqs); i++) {
635 irq = wm831x_irq(wm831x,
636 platform_get_irq_byname(pdev,
637 wm831x_bat_irqs[i]));
638 ret = request_threaded_irq(irq, NULL, wm831x_bat_irq,
639 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
644 "Failed to request %s IRQ %d: %d\n",
645 wm831x_bat_irqs[i], irq, ret);
650 power->usb_phy = devm_usb_get_phy_by_phandle(&pdev->dev, "phys", 0);
651 ret = PTR_ERR_OR_ZERO(power->usb_phy);
655 power->usb_notify.notifier_call = wm831x_usb_limit_change;
656 ret = usb_register_notifier(power->usb_phy, &power->usb_notify);
658 dev_err(&pdev->dev, "Failed to register notifier: %d\n",
665 /* ignore missing usb-phy, it's optional */
666 power->usb_phy = NULL;
670 dev_err(&pdev->dev, "Failed to find USB phy: %d\n", ret);
681 for (; i >= 0; i--) {
682 irq = platform_get_irq_byname(pdev, wm831x_bat_irqs[i]);
683 free_irq(irq, power);
685 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "PWR SRC"));
686 free_irq(irq, power);
688 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "SYSLO"));
689 free_irq(irq, power);
691 if (power->have_battery)
692 power_supply_unregister(power->battery);
694 power_supply_unregister(power->usb);
696 power_supply_unregister(power->wall);
701 static int wm831x_power_remove(struct platform_device *pdev)
703 struct wm831x_power *wm831x_power = platform_get_drvdata(pdev);
704 struct wm831x *wm831x = wm831x_power->wm831x;
707 if (wm831x_power->usb_phy) {
708 usb_unregister_notifier(wm831x_power->usb_phy,
709 &wm831x_power->usb_notify);
712 for (i = 0; i < ARRAY_SIZE(wm831x_bat_irqs); i++) {
713 irq = wm831x_irq(wm831x,
714 platform_get_irq_byname(pdev,
715 wm831x_bat_irqs[i]));
716 free_irq(irq, wm831x_power);
719 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "PWR SRC"));
720 free_irq(irq, wm831x_power);
722 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "SYSLO"));
723 free_irq(irq, wm831x_power);
725 if (wm831x_power->have_battery)
726 power_supply_unregister(wm831x_power->battery);
727 power_supply_unregister(wm831x_power->wall);
728 power_supply_unregister(wm831x_power->usb);
732 static struct platform_driver wm831x_power_driver = {
733 .probe = wm831x_power_probe,
734 .remove = wm831x_power_remove,
736 .name = "wm831x-power",
740 module_platform_driver(wm831x_power_driver);
742 MODULE_DESCRIPTION("Power supply driver for WM831x PMICs");
743 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
744 MODULE_LICENSE("GPL");
745 MODULE_ALIAS("platform:wm831x-power");