2 * Power supply driver for the Active-semi ACT8945A PMIC
4 * Copyright (C) 2015 Atmel Corporation
6 * Author: Wenyou Yang <wenyou.yang@atmel.com>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
13 #include <linux/interrupt.h>
14 #include <linux/module.h>
16 #include <linux/of_irq.h>
17 #include <linux/platform_device.h>
18 #include <linux/power_supply.h>
19 #include <linux/regmap.h>
20 #include <linux/gpio/consumer.h>
22 static const char *act8945a_charger_model = "ACT8945A";
23 static const char *act8945a_charger_manufacturer = "Active-semi";
26 * ACT8945A Charger Register Map
30 #define ACT8945A_APCH_CFG 0x71
31 #define ACT8945A_APCH_STATUS 0x78
32 #define ACT8945A_APCH_CTRL 0x79
33 #define ACT8945A_APCH_STATE 0x7A
35 /* ACT8945A_APCH_CFG */
36 #define APCH_CFG_OVPSET (0x3 << 0)
37 #define APCH_CFG_OVPSET_6V6 (0x0 << 0)
38 #define APCH_CFG_OVPSET_7V (0x1 << 0)
39 #define APCH_CFG_OVPSET_7V5 (0x2 << 0)
40 #define APCH_CFG_OVPSET_8V (0x3 << 0)
41 #define APCH_CFG_PRETIMO (0x3 << 2)
42 #define APCH_CFG_PRETIMO_40_MIN (0x0 << 2)
43 #define APCH_CFG_PRETIMO_60_MIN (0x1 << 2)
44 #define APCH_CFG_PRETIMO_80_MIN (0x2 << 2)
45 #define APCH_CFG_PRETIMO_DISABLED (0x3 << 2)
46 #define APCH_CFG_TOTTIMO (0x3 << 4)
47 #define APCH_CFG_TOTTIMO_3_HOUR (0x0 << 4)
48 #define APCH_CFG_TOTTIMO_4_HOUR (0x1 << 4)
49 #define APCH_CFG_TOTTIMO_5_HOUR (0x2 << 4)
50 #define APCH_CFG_TOTTIMO_DISABLED (0x3 << 4)
51 #define APCH_CFG_SUSCHG (0x1 << 7)
53 #define APCH_STATUS_CHGDAT BIT(0)
54 #define APCH_STATUS_INDAT BIT(1)
55 #define APCH_STATUS_TEMPDAT BIT(2)
56 #define APCH_STATUS_TIMRDAT BIT(3)
57 #define APCH_STATUS_CHGSTAT BIT(4)
58 #define APCH_STATUS_INSTAT BIT(5)
59 #define APCH_STATUS_TEMPSTAT BIT(6)
60 #define APCH_STATUS_TIMRSTAT BIT(7)
62 #define APCH_CTRL_CHGEOCOUT BIT(0)
63 #define APCH_CTRL_INDIS BIT(1)
64 #define APCH_CTRL_TEMPOUT BIT(2)
65 #define APCH_CTRL_TIMRPRE BIT(3)
66 #define APCH_CTRL_CHGEOCIN BIT(4)
67 #define APCH_CTRL_INCON BIT(5)
68 #define APCH_CTRL_TEMPIN BIT(6)
69 #define APCH_CTRL_TIMRTOT BIT(7)
71 #define APCH_STATE_ACINSTAT (0x1 << 1)
72 #define APCH_STATE_CSTATE (0x3 << 4)
73 #define APCH_STATE_CSTATE_SHIFT 4
74 #define APCH_STATE_CSTATE_DISABLED 0x00
75 #define APCH_STATE_CSTATE_EOC 0x01
76 #define APCH_STATE_CSTATE_FAST 0x02
77 #define APCH_STATE_CSTATE_PRE 0x03
79 struct act8945a_charger {
80 struct power_supply *psy;
81 struct power_supply_desc desc;
82 struct regmap *regmap;
83 struct work_struct work;
86 struct gpio_desc *lbo_gpio;
87 struct gpio_desc *chglev_gpio;
90 static int act8945a_get_charger_state(struct regmap *regmap, int *val)
93 unsigned int status, state;
95 ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status);
99 ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state);
103 state &= APCH_STATE_CSTATE;
104 state >>= APCH_STATE_CSTATE_SHIFT;
107 case APCH_STATE_CSTATE_PRE:
108 case APCH_STATE_CSTATE_FAST:
109 *val = POWER_SUPPLY_STATUS_CHARGING;
111 case APCH_STATE_CSTATE_EOC:
112 if (status & APCH_STATUS_CHGDAT)
113 *val = POWER_SUPPLY_STATUS_FULL;
115 *val = POWER_SUPPLY_STATUS_CHARGING;
117 case APCH_STATE_CSTATE_DISABLED:
119 if (!(status & APCH_STATUS_INDAT))
120 *val = POWER_SUPPLY_STATUS_DISCHARGING;
122 *val = POWER_SUPPLY_STATUS_NOT_CHARGING;
129 static int act8945a_get_charge_type(struct regmap *regmap, int *val)
132 unsigned int status, state;
134 ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status);
138 ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state);
142 state &= APCH_STATE_CSTATE;
143 state >>= APCH_STATE_CSTATE_SHIFT;
146 case APCH_STATE_CSTATE_PRE:
147 *val = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
149 case APCH_STATE_CSTATE_FAST:
150 *val = POWER_SUPPLY_CHARGE_TYPE_FAST;
152 case APCH_STATE_CSTATE_EOC:
153 *val = POWER_SUPPLY_CHARGE_TYPE_NONE;
155 case APCH_STATE_CSTATE_DISABLED:
157 if (!(status & APCH_STATUS_INDAT))
158 *val = POWER_SUPPLY_CHARGE_TYPE_NONE;
160 *val = POWER_SUPPLY_CHARGE_TYPE_UNKNOWN;
167 static int act8945a_get_battery_health(struct regmap *regmap, int *val)
170 unsigned int status, state, config;
172 ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status);
176 ret = regmap_read(regmap, ACT8945A_APCH_CFG, &config);
180 ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state);
184 state &= APCH_STATE_CSTATE;
185 state >>= APCH_STATE_CSTATE_SHIFT;
188 case APCH_STATE_CSTATE_DISABLED:
189 if (config & APCH_CFG_SUSCHG) {
190 *val = POWER_SUPPLY_HEALTH_UNKNOWN;
191 } else if (status & APCH_STATUS_INDAT) {
192 if (!(status & APCH_STATUS_TEMPDAT))
193 *val = POWER_SUPPLY_HEALTH_OVERHEAT;
194 else if (status & APCH_STATUS_TIMRDAT)
195 *val = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE;
197 *val = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
199 *val = POWER_SUPPLY_HEALTH_GOOD;
202 case APCH_STATE_CSTATE_PRE:
203 case APCH_STATE_CSTATE_FAST:
204 case APCH_STATE_CSTATE_EOC:
206 *val = POWER_SUPPLY_HEALTH_GOOD;
213 static int act8945a_get_capacity_level(struct act8945a_charger *charger,
214 struct regmap *regmap, int *val)
217 unsigned int status, state, config;
218 int lbo_level = gpiod_get_value(charger->lbo_gpio);
220 ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status);
224 ret = regmap_read(regmap, ACT8945A_APCH_CFG, &config);
228 ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state);
232 state &= APCH_STATE_CSTATE;
233 state >>= APCH_STATE_CSTATE_SHIFT;
236 case APCH_STATE_CSTATE_PRE:
237 *val = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
239 case APCH_STATE_CSTATE_FAST:
241 *val = POWER_SUPPLY_CAPACITY_LEVEL_HIGH;
243 *val = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
245 case APCH_STATE_CSTATE_EOC:
246 if (status & APCH_STATUS_CHGDAT)
247 *val = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
249 *val = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
251 case APCH_STATE_CSTATE_DISABLED:
253 if (config & APCH_CFG_SUSCHG) {
254 *val = POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN;
256 *val = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
257 if (!(status & APCH_STATUS_INDAT)) {
259 *val = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
268 #define MAX_CURRENT_USB_HIGH 450000
269 #define MAX_CURRENT_USB_LOW 90000
270 #define MAX_CURRENT_USB_PRE 45000
272 * Riset(K) = 2336 * (1V/Ichg(mA)) - 0.205
275 #define MAX_CURRENT_AC_HIGH 886527
276 #define MAX_CURRENT_AC_LOW 117305
277 #define MAX_CURRENT_AC_HIGH_PRE 88653
278 #define MAX_CURRENT_AC_LOW_PRE 11731
280 static int act8945a_get_current_max(struct act8945a_charger *charger,
281 struct regmap *regmap, int *val)
284 unsigned int status, state;
285 unsigned int acin_state;
286 int chgin_level = gpiod_get_value(charger->chglev_gpio);
288 ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status);
292 ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state);
296 acin_state = (state & APCH_STATE_ACINSTAT) >> 1;
298 state &= APCH_STATE_CSTATE;
299 state >>= APCH_STATE_CSTATE_SHIFT;
302 case APCH_STATE_CSTATE_PRE:
305 *val = MAX_CURRENT_AC_HIGH_PRE;
307 *val = MAX_CURRENT_AC_LOW_PRE;
309 *val = MAX_CURRENT_USB_PRE;
312 case APCH_STATE_CSTATE_FAST:
315 *val = MAX_CURRENT_AC_HIGH;
317 *val = MAX_CURRENT_AC_LOW;
320 *val = MAX_CURRENT_USB_HIGH;
322 *val = MAX_CURRENT_USB_LOW;
325 case APCH_STATE_CSTATE_EOC:
326 case APCH_STATE_CSTATE_DISABLED:
335 static enum power_supply_property act8945a_charger_props[] = {
336 POWER_SUPPLY_PROP_STATUS,
337 POWER_SUPPLY_PROP_CHARGE_TYPE,
338 POWER_SUPPLY_PROP_TECHNOLOGY,
339 POWER_SUPPLY_PROP_HEALTH,
340 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
341 POWER_SUPPLY_PROP_CURRENT_MAX,
342 POWER_SUPPLY_PROP_MODEL_NAME,
343 POWER_SUPPLY_PROP_MANUFACTURER
346 static int act8945a_charger_get_property(struct power_supply *psy,
347 enum power_supply_property prop,
348 union power_supply_propval *val)
350 struct act8945a_charger *charger = power_supply_get_drvdata(psy);
351 struct regmap *regmap = charger->regmap;
355 case POWER_SUPPLY_PROP_STATUS:
356 ret = act8945a_get_charger_state(regmap, &val->intval);
358 case POWER_SUPPLY_PROP_CHARGE_TYPE:
359 ret = act8945a_get_charge_type(regmap, &val->intval);
361 case POWER_SUPPLY_PROP_TECHNOLOGY:
362 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
364 case POWER_SUPPLY_PROP_HEALTH:
365 ret = act8945a_get_battery_health(regmap, &val->intval);
367 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
368 ret = act8945a_get_capacity_level(charger,
369 regmap, &val->intval);
371 case POWER_SUPPLY_PROP_CURRENT_MAX:
372 ret = act8945a_get_current_max(charger,
373 regmap, &val->intval);
375 case POWER_SUPPLY_PROP_MODEL_NAME:
376 val->strval = act8945a_charger_model;
378 case POWER_SUPPLY_PROP_MANUFACTURER:
379 val->strval = act8945a_charger_manufacturer;
388 static int act8945a_enable_interrupt(struct act8945a_charger *charger)
390 struct regmap *regmap = charger->regmap;
394 ctrl = APCH_CTRL_CHGEOCOUT | APCH_CTRL_CHGEOCIN |
395 APCH_CTRL_INDIS | APCH_CTRL_INCON |
396 APCH_CTRL_TEMPOUT | APCH_CTRL_TEMPIN |
397 APCH_CTRL_TIMRPRE | APCH_CTRL_TIMRTOT;
398 ret = regmap_write(regmap, ACT8945A_APCH_CTRL, ctrl);
402 ctrl = APCH_STATUS_CHGSTAT | APCH_STATUS_INSTAT |
403 APCH_STATUS_TEMPSTAT | APCH_STATUS_TIMRSTAT;
404 ret = regmap_write(regmap, ACT8945A_APCH_STATUS, ctrl);
411 static unsigned int act8945a_set_supply_type(struct act8945a_charger *charger,
414 unsigned int status, state;
417 ret = regmap_read(charger->regmap, ACT8945A_APCH_STATUS, &status);
421 ret = regmap_read(charger->regmap, ACT8945A_APCH_STATE, &state);
425 if (status & APCH_STATUS_INDAT) {
426 if (state & APCH_STATE_ACINSTAT)
427 *type = POWER_SUPPLY_TYPE_MAINS;
429 *type = POWER_SUPPLY_TYPE_USB;
431 *type = POWER_SUPPLY_TYPE_BATTERY;
437 static void act8945a_work(struct work_struct *work)
439 struct act8945a_charger *charger =
440 container_of(work, struct act8945a_charger, work);
442 act8945a_set_supply_type(charger, &charger->desc.type);
444 power_supply_changed(charger->psy);
447 static irqreturn_t act8945a_status_changed(int irq, void *dev_id)
449 struct act8945a_charger *charger = dev_id;
451 if (charger->init_done)
452 schedule_work(&charger->work);
457 #define DEFAULT_TOTAL_TIME_OUT 3
458 #define DEFAULT_PRE_TIME_OUT 40
459 #define DEFAULT_INPUT_OVP_THRESHOLD 6600
461 static int act8945a_charger_config(struct device *dev,
462 struct act8945a_charger *charger)
464 struct device_node *np = dev->of_node;
465 struct regmap *regmap = charger->regmap;
469 u32 input_voltage_threshold;
473 unsigned int value = 0;
476 dev_err(dev, "no charger of node\n");
480 ret = regmap_read(regmap, ACT8945A_APCH_CFG, &tmp);
484 if (tmp & APCH_CFG_SUSCHG) {
485 value |= APCH_CFG_SUSCHG;
486 dev_info(dev, "have been suspended\n");
489 charger->lbo_gpio = devm_gpiod_get_optional(dev, "active-semi,lbo",
491 if (IS_ERR(charger->lbo_gpio)) {
492 err = PTR_ERR(charger->lbo_gpio);
493 dev_err(dev, "unable to claim gpio \"lbo\": %d\n", err);
497 ret = devm_request_irq(dev, gpiod_to_irq(charger->lbo_gpio),
498 act8945a_status_changed,
499 (IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING),
500 "act8945a_lbo_detect", charger);
502 dev_info(dev, "failed to request gpio \"lbo\" IRQ\n");
504 charger->chglev_gpio = devm_gpiod_get_optional(dev,
505 "active-semi,chglev",
507 if (IS_ERR(charger->chglev_gpio)) {
508 err = PTR_ERR(charger->chglev_gpio);
509 dev_err(dev, "unable to claim gpio \"chglev\": %d\n", err);
513 if (of_property_read_u32(np,
514 "active-semi,input-voltage-threshold-microvolt",
515 &input_voltage_threshold))
516 input_voltage_threshold = DEFAULT_INPUT_OVP_THRESHOLD;
518 if (of_property_read_u32(np,
519 "active-semi,precondition-timeout",
521 pre_time_out = DEFAULT_PRE_TIME_OUT;
523 if (of_property_read_u32(np, "active-semi,total-timeout",
525 total_time_out = DEFAULT_TOTAL_TIME_OUT;
527 switch (input_voltage_threshold) {
529 value |= APCH_CFG_OVPSET_8V;
532 value |= APCH_CFG_OVPSET_7V5;
535 value |= APCH_CFG_OVPSET_7V;
539 value |= APCH_CFG_OVPSET_6V6;
543 switch (pre_time_out) {
545 value |= APCH_CFG_PRETIMO_60_MIN;
548 value |= APCH_CFG_PRETIMO_80_MIN;
551 value |= APCH_CFG_PRETIMO_DISABLED;
555 value |= APCH_CFG_PRETIMO_40_MIN;
559 switch (total_time_out) {
561 value |= APCH_CFG_TOTTIMO_4_HOUR;
564 value |= APCH_CFG_TOTTIMO_5_HOUR;
567 value |= APCH_CFG_TOTTIMO_DISABLED;
571 value |= APCH_CFG_TOTTIMO_3_HOUR;
575 return regmap_write(regmap, ACT8945A_APCH_CFG, value);
578 static int act8945a_charger_probe(struct platform_device *pdev)
580 struct act8945a_charger *charger;
581 struct power_supply_config psy_cfg = {};
584 charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);
588 charger->regmap = dev_get_regmap(pdev->dev.parent, NULL);
589 if (!charger->regmap) {
590 dev_err(&pdev->dev, "Parent did not provide regmap\n");
594 ret = act8945a_charger_config(&pdev->dev, charger);
598 irq = of_irq_get(pdev->dev.of_node, 0);
600 dev_err(&pdev->dev, "failed to find IRQ number\n");
601 return irq ?: -ENXIO;
604 ret = devm_request_irq(&pdev->dev, irq, act8945a_status_changed,
605 IRQF_TRIGGER_FALLING, "act8945a_interrupt",
608 dev_err(&pdev->dev, "failed to request nIRQ pin IRQ\n");
612 charger->desc.name = "act8945a-charger";
613 charger->desc.get_property = act8945a_charger_get_property;
614 charger->desc.properties = act8945a_charger_props;
615 charger->desc.num_properties = ARRAY_SIZE(act8945a_charger_props);
617 ret = act8945a_set_supply_type(charger, &charger->desc.type);
621 psy_cfg.of_node = pdev->dev.of_node;
622 psy_cfg.drv_data = charger;
624 charger->psy = devm_power_supply_register(&pdev->dev,
627 if (IS_ERR(charger->psy)) {
628 dev_err(&pdev->dev, "failed to register power supply\n");
629 return PTR_ERR(charger->psy);
632 platform_set_drvdata(pdev, charger);
634 INIT_WORK(&charger->work, act8945a_work);
636 ret = act8945a_enable_interrupt(charger);
640 charger->init_done = true;
645 static int act8945a_charger_remove(struct platform_device *pdev)
647 struct act8945a_charger *charger = platform_get_drvdata(pdev);
649 charger->init_done = false;
650 cancel_work_sync(&charger->work);
655 static struct platform_driver act8945a_charger_driver = {
657 .name = "act8945a-charger",
659 .probe = act8945a_charger_probe,
660 .remove = act8945a_charger_remove,
662 module_platform_driver(act8945a_charger_driver);
664 MODULE_DESCRIPTION("Active-semi ACT8945A ActivePath charger driver");
665 MODULE_AUTHOR("Wenyou Yang <wenyou.yang@atmel.com>");
666 MODULE_LICENSE("GPL");