1 // SPDX-License-Identifier: GPL-2.0-only
3 * Battery driver for wm8350 PMIC
5 * Copyright 2007, 2008 Wolfson Microelectronics PLC.
7 * Based on OLPC Battery Driver
9 * Copyright 2006 David Woodhouse <dwmw2@infradead.org>
12 #include <linux/module.h>
13 #include <linux/err.h>
14 #include <linux/platform_device.h>
15 #include <linux/power_supply.h>
16 #include <linux/mfd/wm8350/supply.h>
17 #include <linux/mfd/wm8350/core.h>
18 #include <linux/mfd/wm8350/comparator.h>
20 static int wm8350_read_battery_uvolts(struct wm8350 *wm8350)
22 return wm8350_read_auxadc(wm8350, WM8350_AUXADC_BATT, 0, 0)
26 static int wm8350_read_line_uvolts(struct wm8350 *wm8350)
28 return wm8350_read_auxadc(wm8350, WM8350_AUXADC_LINE, 0, 0)
32 static int wm8350_read_usb_uvolts(struct wm8350 *wm8350)
34 return wm8350_read_auxadc(wm8350, WM8350_AUXADC_USB, 0, 0)
38 #define WM8350_BATT_SUPPLY 1
39 #define WM8350_USB_SUPPLY 2
40 #define WM8350_LINE_SUPPLY 4
42 static inline int wm8350_charge_time_min(struct wm8350 *wm8350, int min)
44 if (!wm8350->power.rev_g_coeff)
45 return (((min - 30) / 15) & 0xf) << 8;
47 return (((min - 30) / 30) & 0xf) << 8;
50 static int wm8350_get_supplies(struct wm8350 *wm8350)
55 sm = wm8350_reg_read(wm8350, WM8350_STATE_MACHINE_STATUS);
56 ov = wm8350_reg_read(wm8350, WM8350_MISC_OVERRIDES);
57 co = wm8350_reg_read(wm8350, WM8350_COMPARATOR_OVERRIDES);
58 chrg = wm8350_reg_read(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2);
61 sm = (sm & WM8350_USB_SM_MASK) >> WM8350_USB_SM_SHIFT;
64 chrg &= WM8350_CHG_ISEL_MASK;
66 /* If the USB state machine is active then we're using that with or
67 * without battery, otherwise check for wall supply */
68 if (((sm == WM8350_USB_SM_100_SLV) ||
69 (sm == WM8350_USB_SM_500_SLV) ||
70 (sm == WM8350_USB_SM_STDBY_SLV))
71 && !(ov & WM8350_USB_LIMIT_OVRDE))
72 supplies = WM8350_USB_SUPPLY;
73 else if (((sm == WM8350_USB_SM_100_SLV) ||
74 (sm == WM8350_USB_SM_500_SLV) ||
75 (sm == WM8350_USB_SM_STDBY_SLV))
76 && (ov & WM8350_USB_LIMIT_OVRDE) && (chrg == 0))
77 supplies = WM8350_USB_SUPPLY | WM8350_BATT_SUPPLY;
78 else if (co & WM8350_WALL_FB_OVRDE)
79 supplies = WM8350_LINE_SUPPLY;
81 supplies = WM8350_BATT_SUPPLY;
86 static int wm8350_charger_config(struct wm8350 *wm8350,
87 struct wm8350_charger_policy *policy)
89 u16 reg, eoc_mA, fast_limit_mA;
93 "No charger policy, charger not configured.\n");
97 /* make sure USB fast charge current is not > 500mA */
98 if (policy->fast_limit_USB_mA > 500) {
99 dev_err(wm8350->dev, "USB fast charge > 500mA\n");
103 eoc_mA = WM8350_CHG_EOC_mA(policy->eoc_mA);
105 wm8350_reg_unlock(wm8350);
107 reg = wm8350_reg_read(wm8350, WM8350_BATTERY_CHARGER_CONTROL_1)
108 & WM8350_CHG_ENA_R168;
109 wm8350_reg_write(wm8350, WM8350_BATTERY_CHARGER_CONTROL_1,
110 reg | eoc_mA | policy->trickle_start_mV |
111 WM8350_CHG_TRICKLE_TEMP_CHOKE |
112 WM8350_CHG_TRICKLE_USB_CHOKE |
113 WM8350_CHG_FAST_USB_THROTTLE);
115 if (wm8350_get_supplies(wm8350) & WM8350_USB_SUPPLY) {
117 WM8350_CHG_FAST_LIMIT_mA(policy->fast_limit_USB_mA);
118 wm8350_reg_write(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2,
119 policy->charge_mV | policy->trickle_charge_USB_mA |
120 fast_limit_mA | wm8350_charge_time_min(wm8350,
121 policy->charge_timeout));
125 WM8350_CHG_FAST_LIMIT_mA(policy->fast_limit_mA);
126 wm8350_reg_write(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2,
127 policy->charge_mV | policy->trickle_charge_mA |
128 fast_limit_mA | wm8350_charge_time_min(wm8350,
129 policy->charge_timeout));
132 wm8350_reg_lock(wm8350);
136 static int wm8350_batt_status(struct wm8350 *wm8350)
140 state = wm8350_reg_read(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2);
141 state &= WM8350_CHG_STS_MASK;
144 case WM8350_CHG_STS_OFF:
145 return POWER_SUPPLY_STATUS_DISCHARGING;
147 case WM8350_CHG_STS_TRICKLE:
148 case WM8350_CHG_STS_FAST:
149 return POWER_SUPPLY_STATUS_CHARGING;
152 return POWER_SUPPLY_STATUS_UNKNOWN;
156 static ssize_t charger_state_show(struct device *dev,
157 struct device_attribute *attr, char *buf)
159 struct wm8350 *wm8350 = dev_get_drvdata(dev);
163 state = wm8350_reg_read(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2) &
166 case WM8350_CHG_STS_OFF:
167 charge = "Charger Off";
169 case WM8350_CHG_STS_TRICKLE:
170 charge = "Trickle Charging";
172 case WM8350_CHG_STS_FAST:
173 charge = "Fast Charging";
179 return sprintf(buf, "%s\n", charge);
182 static DEVICE_ATTR_RO(charger_state);
184 static irqreturn_t wm8350_charger_handler(int irq, void *data)
186 struct wm8350 *wm8350 = data;
187 struct wm8350_power *power = &wm8350->power;
188 struct wm8350_charger_policy *policy = power->policy;
190 switch (irq - wm8350->irq_base) {
191 case WM8350_IRQ_CHG_BAT_FAIL:
192 dev_err(wm8350->dev, "battery failed\n");
194 case WM8350_IRQ_CHG_TO:
195 dev_err(wm8350->dev, "charger timeout\n");
196 power_supply_changed(power->battery);
199 case WM8350_IRQ_CHG_BAT_HOT:
200 case WM8350_IRQ_CHG_BAT_COLD:
201 case WM8350_IRQ_CHG_START:
202 case WM8350_IRQ_CHG_END:
203 power_supply_changed(power->battery);
206 case WM8350_IRQ_CHG_FAST_RDY:
207 dev_dbg(wm8350->dev, "fast charger ready\n");
208 wm8350_charger_config(wm8350, policy);
209 wm8350_reg_unlock(wm8350);
210 wm8350_set_bits(wm8350, WM8350_BATTERY_CHARGER_CONTROL_1,
212 wm8350_reg_lock(wm8350);
215 case WM8350_IRQ_CHG_VBATT_LT_3P9:
216 dev_warn(wm8350->dev, "battery < 3.9V\n");
218 case WM8350_IRQ_CHG_VBATT_LT_3P1:
219 dev_warn(wm8350->dev, "battery < 3.1V\n");
221 case WM8350_IRQ_CHG_VBATT_LT_2P85:
222 dev_warn(wm8350->dev, "battery < 2.85V\n");
225 /* Supply change. We will overnotify but it should do
227 case WM8350_IRQ_EXT_USB_FB:
228 case WM8350_IRQ_EXT_WALL_FB:
229 wm8350_charger_config(wm8350, policy);
231 case WM8350_IRQ_EXT_BAT_FB:
232 power_supply_changed(power->battery);
233 power_supply_changed(power->usb);
234 power_supply_changed(power->ac);
238 dev_err(wm8350->dev, "Unknown interrupt %d\n", irq);
244 /*********************************************************************
246 *********************************************************************/
247 static int wm8350_ac_get_prop(struct power_supply *psy,
248 enum power_supply_property psp,
249 union power_supply_propval *val)
251 struct wm8350 *wm8350 = dev_get_drvdata(psy->dev.parent);
255 case POWER_SUPPLY_PROP_ONLINE:
256 val->intval = !!(wm8350_get_supplies(wm8350) &
259 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
260 val->intval = wm8350_read_line_uvolts(wm8350);
269 static enum power_supply_property wm8350_ac_props[] = {
270 POWER_SUPPLY_PROP_ONLINE,
271 POWER_SUPPLY_PROP_VOLTAGE_NOW,
274 /*********************************************************************
276 *********************************************************************/
277 static int wm8350_usb_get_prop(struct power_supply *psy,
278 enum power_supply_property psp,
279 union power_supply_propval *val)
281 struct wm8350 *wm8350 = dev_get_drvdata(psy->dev.parent);
285 case POWER_SUPPLY_PROP_ONLINE:
286 val->intval = !!(wm8350_get_supplies(wm8350) &
289 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
290 val->intval = wm8350_read_usb_uvolts(wm8350);
299 static enum power_supply_property wm8350_usb_props[] = {
300 POWER_SUPPLY_PROP_ONLINE,
301 POWER_SUPPLY_PROP_VOLTAGE_NOW,
304 /*********************************************************************
306 *********************************************************************/
308 static int wm8350_bat_check_health(struct wm8350 *wm8350)
312 if (wm8350_read_battery_uvolts(wm8350) < 2850000)
313 return POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
315 reg = wm8350_reg_read(wm8350, WM8350_CHARGER_OVERRIDES);
316 if (reg & WM8350_CHG_BATT_HOT_OVRDE)
317 return POWER_SUPPLY_HEALTH_OVERHEAT;
319 if (reg & WM8350_CHG_BATT_COLD_OVRDE)
320 return POWER_SUPPLY_HEALTH_COLD;
322 return POWER_SUPPLY_HEALTH_GOOD;
325 static int wm8350_bat_get_charge_type(struct wm8350 *wm8350)
329 state = wm8350_reg_read(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2) &
332 case WM8350_CHG_STS_OFF:
333 return POWER_SUPPLY_CHARGE_TYPE_NONE;
334 case WM8350_CHG_STS_TRICKLE:
335 return POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
336 case WM8350_CHG_STS_FAST:
337 return POWER_SUPPLY_CHARGE_TYPE_FAST;
339 return POWER_SUPPLY_CHARGE_TYPE_UNKNOWN;
343 static int wm8350_bat_get_property(struct power_supply *psy,
344 enum power_supply_property psp,
345 union power_supply_propval *val)
347 struct wm8350 *wm8350 = dev_get_drvdata(psy->dev.parent);
351 case POWER_SUPPLY_PROP_STATUS:
352 val->intval = wm8350_batt_status(wm8350);
354 case POWER_SUPPLY_PROP_ONLINE:
355 val->intval = !!(wm8350_get_supplies(wm8350) &
358 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
359 val->intval = wm8350_read_battery_uvolts(wm8350);
361 case POWER_SUPPLY_PROP_HEALTH:
362 val->intval = wm8350_bat_check_health(wm8350);
364 case POWER_SUPPLY_PROP_CHARGE_TYPE:
365 val->intval = wm8350_bat_get_charge_type(wm8350);
375 static enum power_supply_property wm8350_bat_props[] = {
376 POWER_SUPPLY_PROP_STATUS,
377 POWER_SUPPLY_PROP_ONLINE,
378 POWER_SUPPLY_PROP_VOLTAGE_NOW,
379 POWER_SUPPLY_PROP_HEALTH,
380 POWER_SUPPLY_PROP_CHARGE_TYPE,
383 static const struct power_supply_desc wm8350_ac_desc = {
385 .type = POWER_SUPPLY_TYPE_MAINS,
386 .properties = wm8350_ac_props,
387 .num_properties = ARRAY_SIZE(wm8350_ac_props),
388 .get_property = wm8350_ac_get_prop,
391 static const struct power_supply_desc wm8350_battery_desc = {
392 .name = "wm8350-battery",
393 .properties = wm8350_bat_props,
394 .num_properties = ARRAY_SIZE(wm8350_bat_props),
395 .get_property = wm8350_bat_get_property,
399 static const struct power_supply_desc wm8350_usb_desc = {
400 .name = "wm8350-usb",
401 .type = POWER_SUPPLY_TYPE_USB,
402 .properties = wm8350_usb_props,
403 .num_properties = ARRAY_SIZE(wm8350_usb_props),
404 .get_property = wm8350_usb_get_prop,
407 /*********************************************************************
409 *********************************************************************/
411 static int wm8350_init_charger(struct wm8350 *wm8350)
415 /* register our interest in charger events */
416 ret = wm8350_register_irq(wm8350, WM8350_IRQ_CHG_BAT_HOT,
417 wm8350_charger_handler, 0, "Battery hot", wm8350);
421 ret = wm8350_register_irq(wm8350, WM8350_IRQ_CHG_BAT_COLD,
422 wm8350_charger_handler, 0, "Battery cold", wm8350);
424 goto free_chg_bat_hot;
426 ret = wm8350_register_irq(wm8350, WM8350_IRQ_CHG_BAT_FAIL,
427 wm8350_charger_handler, 0, "Battery fail", wm8350);
429 goto free_chg_bat_cold;
431 ret = wm8350_register_irq(wm8350, WM8350_IRQ_CHG_TO,
432 wm8350_charger_handler, 0,
433 "Charger timeout", wm8350);
435 goto free_chg_bat_fail;
437 ret = wm8350_register_irq(wm8350, WM8350_IRQ_CHG_END,
438 wm8350_charger_handler, 0,
439 "Charge end", wm8350);
443 ret = wm8350_register_irq(wm8350, WM8350_IRQ_CHG_START,
444 wm8350_charger_handler, 0,
445 "Charge start", wm8350);
449 ret = wm8350_register_irq(wm8350, WM8350_IRQ_CHG_FAST_RDY,
450 wm8350_charger_handler, 0,
451 "Fast charge ready", wm8350);
455 ret = wm8350_register_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P9,
456 wm8350_charger_handler, 0,
457 "Battery <3.9V", wm8350);
459 goto free_chg_fast_rdy;
461 ret = wm8350_register_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P1,
462 wm8350_charger_handler, 0,
463 "Battery <3.1V", wm8350);
465 goto free_chg_vbatt_lt_3p9;
467 ret = wm8350_register_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_2P85,
468 wm8350_charger_handler, 0,
469 "Battery <2.85V", wm8350);
471 goto free_chg_vbatt_lt_3p1;
473 /* and supply change events */
474 ret = wm8350_register_irq(wm8350, WM8350_IRQ_EXT_USB_FB,
475 wm8350_charger_handler, 0, "USB", wm8350);
477 goto free_chg_vbatt_lt_2p85;
479 ret = wm8350_register_irq(wm8350, WM8350_IRQ_EXT_WALL_FB,
480 wm8350_charger_handler, 0, "Wall", wm8350);
482 goto free_ext_usb_fb;
484 ret = wm8350_register_irq(wm8350, WM8350_IRQ_EXT_BAT_FB,
485 wm8350_charger_handler, 0, "Battery", wm8350);
487 goto free_ext_wall_fb;
492 wm8350_free_irq(wm8350, WM8350_IRQ_EXT_WALL_FB, wm8350);
494 wm8350_free_irq(wm8350, WM8350_IRQ_EXT_USB_FB, wm8350);
495 free_chg_vbatt_lt_2p85:
496 wm8350_free_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_2P85, wm8350);
497 free_chg_vbatt_lt_3p1:
498 wm8350_free_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P1, wm8350);
499 free_chg_vbatt_lt_3p9:
500 wm8350_free_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P9, wm8350);
502 wm8350_free_irq(wm8350, WM8350_IRQ_CHG_FAST_RDY, wm8350);
504 wm8350_free_irq(wm8350, WM8350_IRQ_CHG_START, wm8350);
506 wm8350_free_irq(wm8350, WM8350_IRQ_CHG_END, wm8350);
508 wm8350_free_irq(wm8350, WM8350_IRQ_CHG_TO, wm8350);
510 wm8350_free_irq(wm8350, WM8350_IRQ_CHG_BAT_FAIL, wm8350);
512 wm8350_free_irq(wm8350, WM8350_IRQ_CHG_BAT_COLD, wm8350);
514 wm8350_free_irq(wm8350, WM8350_IRQ_CHG_BAT_HOT, wm8350);
519 static void free_charger_irq(struct wm8350 *wm8350)
521 wm8350_free_irq(wm8350, WM8350_IRQ_CHG_BAT_HOT, wm8350);
522 wm8350_free_irq(wm8350, WM8350_IRQ_CHG_BAT_COLD, wm8350);
523 wm8350_free_irq(wm8350, WM8350_IRQ_CHG_BAT_FAIL, wm8350);
524 wm8350_free_irq(wm8350, WM8350_IRQ_CHG_TO, wm8350);
525 wm8350_free_irq(wm8350, WM8350_IRQ_CHG_END, wm8350);
526 wm8350_free_irq(wm8350, WM8350_IRQ_CHG_START, wm8350);
527 wm8350_free_irq(wm8350, WM8350_IRQ_CHG_FAST_RDY, wm8350);
528 wm8350_free_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P9, wm8350);
529 wm8350_free_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P1, wm8350);
530 wm8350_free_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_2P85, wm8350);
531 wm8350_free_irq(wm8350, WM8350_IRQ_EXT_USB_FB, wm8350);
532 wm8350_free_irq(wm8350, WM8350_IRQ_EXT_WALL_FB, wm8350);
533 wm8350_free_irq(wm8350, WM8350_IRQ_EXT_BAT_FB, wm8350);
536 static int wm8350_power_probe(struct platform_device *pdev)
538 struct wm8350 *wm8350 = platform_get_drvdata(pdev);
539 struct wm8350_power *power = &wm8350->power;
540 struct wm8350_charger_policy *policy = power->policy;
543 power->ac = power_supply_register(&pdev->dev, &wm8350_ac_desc, NULL);
544 if (IS_ERR(power->ac))
545 return PTR_ERR(power->ac);
547 power->battery = power_supply_register(&pdev->dev, &wm8350_battery_desc,
549 if (IS_ERR(power->battery)) {
550 ret = PTR_ERR(power->battery);
554 power->usb = power_supply_register(&pdev->dev, &wm8350_usb_desc, NULL);
555 if (IS_ERR(power->usb)) {
556 ret = PTR_ERR(power->usb);
560 ret = device_create_file(&pdev->dev, &dev_attr_charger_state);
562 dev_warn(wm8350->dev, "failed to add charge sysfs: %d\n", ret);
565 wm8350_init_charger(wm8350);
566 if (wm8350_charger_config(wm8350, policy) == 0) {
567 wm8350_reg_unlock(wm8350);
568 wm8350_set_bits(wm8350, WM8350_POWER_MGMT_5, WM8350_CHG_ENA);
569 wm8350_reg_lock(wm8350);
575 power_supply_unregister(power->battery);
577 power_supply_unregister(power->ac);
582 static int wm8350_power_remove(struct platform_device *pdev)
584 struct wm8350 *wm8350 = platform_get_drvdata(pdev);
585 struct wm8350_power *power = &wm8350->power;
587 free_charger_irq(wm8350);
588 device_remove_file(&pdev->dev, &dev_attr_charger_state);
589 power_supply_unregister(power->battery);
590 power_supply_unregister(power->ac);
591 power_supply_unregister(power->usb);
595 static struct platform_driver wm8350_power_driver = {
596 .probe = wm8350_power_probe,
597 .remove = wm8350_power_remove,
599 .name = "wm8350-power",
603 module_platform_driver(wm8350_power_driver);
605 MODULE_LICENSE("GPL");
606 MODULE_DESCRIPTION("Power supply driver for WM8350");
607 MODULE_ALIAS("platform:wm8350-power");