@@ -0,0 +1,397 @@
+/*
+ * Power supply driver for the Active-semi ACT8945A PMIC
+ *
+ * Copyright (C) 2015 Atmel Corporation
+ * Wenyou Yang <wenyou.yang@atmel.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/mfd/act8945a.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/regmap.h>
+
+static const char *act8945a_charger_model = "ACT8945A";
+static const char *act8945a_charger_manufacturer = "Active-semi";
+
+/**
+ * ACT8945A Charger Register Map
+ */
+
+/* 0x70: Reserved */
+#define ACT8945A_APCH_CFG 0x71
+#define ACT8945A_APCH_STATUS 0x78
+#define ACT8945A_APCH_CTRL 0x79
+#define ACT8945A_APCH_STATE 0x7A
+
+/* ACT8945A_APCH_CFG */
+#define APCH_CFG_OVPSET (0x03 << 0)
+#define APCH_CFG_OVPSET_6V6 (0x0 << 0)
+#define APCH_CFG_OVPSET_7V (0x1 << 0)
+#define APCH_CFG_OVPSET_7V5 (0x2 << 0)
+#define APCH_CFG_OVPSET_8V (0x3 << 0)
+#define APCH_CFG_PRETIMO (0x03 << 2)
+#define APCH_CFG_PRETIMO_40_MIN (0x0 << 2)
+#define APCH_CFG_PRETIMO_60_MIN (0x1 << 2)
+#define APCH_CFG_PRETIMO_80_MIN (0x2 << 2)
+#define APCH_CFG_PRETIMO_DISABLED (0x3 << 2)
+#define APCH_CFG_TOTTIMO (0x03 << 4)
+#define APCH_CFG_TOTTIMO_3_HOUR (0x0 << 4)
+#define APCH_CFG_TOTTIMO_4_HOUR (0x1 << 4)
+#define APCH_CFG_TOTTIMO_5_HOUR (0x2 << 4)
+#define APCH_CFG_TOTTIMO_DISABLED (0x3 << 4)
+#define APCH_CFG_SUSCHG (0x01 << 7)
+
+#define APCH_STATUS_CHGDAT (0x01 << 0)
+#define APCH_STATUS_INDAT (0x01 << 1)
+#define APCH_STATUS_TEMPDAT (0x01 << 2)
+#define APCH_STATUS_TIMRDAT (0x01 << 3)
+#define APCH_STATUS_CHGSTAT (0x01 << 4)
+#define APCH_STATUS_INSTAT (0x01 << 5)
+#define APCH_STATUS_TEMPSTAT (0x01 << 6)
+#define APCH_STATUS_TIMRSTAT (0x01 << 7)
+
+#define APCH_CTRL_CHGEOCOUT (0x01 << 0)
+#define APCH_CTRL_INDIS (0x01 << 1)
+#define APCH_CTRL_TEMPOUT (0x01 << 2)
+#define APCH_CTRL_TIMRPRE (0x01 << 3)
+#define APCH_CTRL_CHGEOCIN (0x01 << 4)
+#define APCH_CTRL_INCON (0x01 << 5)
+#define APCH_CTRL_TEMPIN (0x01 << 6)
+#define APCH_CTRL_TIMRTOT (0x01 << 7)
+
+#define APCH_STATE_ACINSTAT (0x01 << 1)
+#define APCH_STATE_CSTATE (0x03 << 4)
+#define APCH_STATE_CSTATE_SHIFT 4
+#define APCH_STATE_CSTATE_DISABLED 0x00
+#define APCH_STATE_CSTATE_EOC 0x01
+#define APCH_STATE_CSTATE_FAST 0x02
+#define APCH_STATE_CSTATE_PRE 0x03
+
+struct act8945a_charger {
+ struct device *dev;
+ struct act8945a_dev *act8945a_dev;
+ struct power_supply *psy;
+
+ u32 tolal_time_out;
+ u32 pre_time_out;
+ u32 input_voltage_threshold;
+ bool battery_temperature;
+ int chglev_pin;
+ int chglev_value;
+};
+
+static int act8945a_get_charger_state(struct regmap *regmap, int *val)
+{
+ int ret;
+ unsigned int status, state;
+
+ ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status);
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state);
+ if (ret < 0)
+ return ret;
+
+ state &= APCH_STATE_CSTATE;
+ state >>= APCH_STATE_CSTATE_SHIFT;
+
+ if (state == APCH_STATE_CSTATE_EOC) {
+ if (status & APCH_STATUS_CHGDAT)
+ *val = POWER_SUPPLY_STATUS_FULL;
+ else
+ *val = POWER_SUPPLY_STATUS_NOT_CHARGING;
+ } else if ((state == APCH_STATE_CSTATE_FAST) ||
+ (state == APCH_STATE_CSTATE_PRE)) {
+ *val = POWER_SUPPLY_STATUS_CHARGING;
+ } else {
+ *val = POWER_SUPPLY_STATUS_NOT_CHARGING;
+ }
+
+ return 0;
+}
+
+static int act8945a_get_charge_type(struct regmap *regmap, int *val)
+{
+ int ret;
+ unsigned int state;
+
+ ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state);
+ if (ret < 0)
+ return ret;
+
+ state &= APCH_STATE_CSTATE;
+ state >>= APCH_STATE_CSTATE_SHIFT;
+
+ switch (state) {
+ case APCH_STATE_CSTATE_PRE:
+ *val = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
+ break;
+ case APCH_STATE_CSTATE_FAST:
+ *val = POWER_SUPPLY_CHARGE_TYPE_FAST;
+ break;
+ case APCH_STATE_CSTATE_EOC:
+ case APCH_STATE_CSTATE_DISABLED:
+ default:
+ *val = POWER_SUPPLY_CHARGE_TYPE_NONE;
+ }
+
+ return 0;
+}
+
+static int act8945a_get_battery_health(struct act8945a_charger *charger,
+ struct regmap *regmap, int *val)
+{
+ int ret;
+ unsigned int status;
+
+ ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status);
+ if (ret < 0)
+ return ret;
+
+ if (charger->battery_temperature && !(status & APCH_STATUS_TEMPDAT))
+ *val = POWER_SUPPLY_HEALTH_OVERHEAT;
+ else if (!(status & APCH_STATUS_INDAT))
+ *val = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
+ else if (status & APCH_STATUS_TIMRDAT)
+ *val = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE;
+ else
+ *val = POWER_SUPPLY_HEALTH_GOOD;
+
+ return 0;
+}
+
+static enum power_supply_property act8945a_charger_props[] = {
+ POWER_SUPPLY_PROP_STATUS,
+ POWER_SUPPLY_PROP_CHARGE_TYPE,
+ POWER_SUPPLY_PROP_TECHNOLOGY,
+ POWER_SUPPLY_PROP_HEALTH,
+ POWER_SUPPLY_PROP_MODEL_NAME,
+ POWER_SUPPLY_PROP_MANUFACTURER
+};
+
+static int act8945a_charger_get_property(struct power_supply *psy,
+ enum power_supply_property prop,
+ union power_supply_propval *val)
+{
+ struct act8945a_charger *charger = power_supply_get_drvdata(psy);
+ struct regmap *regmap = charger->act8945a_dev->regmap;
+ int ret = 0;
+
+ switch (prop) {
+ case POWER_SUPPLY_PROP_STATUS:
+ ret = act8945a_get_charger_state(regmap, &val->intval);
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_TYPE:
+ ret = act8945a_get_charge_type(regmap, &val->intval);
+ break;
+ case POWER_SUPPLY_PROP_TECHNOLOGY:
+ val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
+ break;
+ case POWER_SUPPLY_PROP_HEALTH:
+ ret = act8945a_get_battery_health(charger,
+ regmap, &val->intval);
+ break;
+ case POWER_SUPPLY_PROP_MODEL_NAME:
+ val->strval = act8945a_charger_model;
+ break;
+ case POWER_SUPPLY_PROP_MANUFACTURER:
+ val->strval = act8945a_charger_manufacturer;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return ret;
+}
+
+static const struct power_supply_desc act8945a_charger_desc = {
+ .name = "act8945a-charger",
+ .type = POWER_SUPPLY_TYPE_BATTERY,
+ .get_property = act8945a_charger_get_property,
+ .properties = act8945a_charger_props,
+ .num_properties = ARRAY_SIZE(act8945a_charger_props),
+};
+
+#define DEFAULT_TOTAL_TIME_OUT 3
+#define DEFAULT_PRE_TIME_OUT 40
+#define DEFAULT_INPUT_OVP_THRESHOLD 6600
+
+static int act8945a_charger_parse_dt(struct device *dev,
+ struct act8945a_charger *charger)
+{
+ struct device_node *np = dev->of_node;
+ enum of_gpio_flags flags;
+
+ if (!np) {
+ dev_err(dev, "no charger of node\n");
+ return -EINVAL;
+ }
+
+ charger->chglev_pin = of_get_named_gpio_flags(np,
+ "active-semi,chglev-gpio", 0, &flags);
+
+ charger->chglev_value = (flags == OF_GPIO_ACTIVE_LOW) ? 0 : 1;
+
+ charger->battery_temperature = !!of_get_property(np,
+ "active-semi,battery_temperature", NULL);
+
+ if (of_property_read_u32(np, "active-semi,input_voltage_threshold",
+ &charger->input_voltage_threshold))
+ charger->input_voltage_threshold = DEFAULT_PRE_TIME_OUT;
+
+ if (of_property_read_u32(np, "active-semi,precondition_timeout",
+ &charger->pre_time_out))
+ charger->pre_time_out = DEFAULT_PRE_TIME_OUT;
+
+ if (of_property_read_u32(np, "active-semi,total_timeout",
+ &charger->tolal_time_out))
+ charger->tolal_time_out = DEFAULT_TOTAL_TIME_OUT;
+
+ return 0;
+}
+
+static int act8945a_charger_config(struct act8945a_charger *charger)
+{
+ struct regmap *regmap = charger->act8945a_dev->regmap;
+ u8 value = 0;
+
+ if (gpio_is_valid(charger->chglev_pin))
+ gpio_set_value(charger->chglev_pin, charger->chglev_value);
+
+ switch (charger->input_voltage_threshold) {
+ case 8000:
+ value |= APCH_CFG_OVPSET_8V;
+ break;
+ case 7500:
+ value |= APCH_CFG_OVPSET_7V5;
+ break;
+ case 7000:
+ value |= APCH_CFG_OVPSET_7V;
+ break;
+ case 6600:
+ default:
+ value |= APCH_CFG_OVPSET_6V6;
+ break;
+ }
+
+ switch (charger->pre_time_out) {
+ case 60:
+ value |= APCH_CFG_PRETIMO_60_MIN;
+ break;
+ case 80:
+ value |= APCH_CFG_PRETIMO_80_MIN;
+ break;
+ case 0:
+ value |= APCH_CFG_PRETIMO_DISABLED;
+ break;
+ case 40:
+ default:
+ value |= APCH_CFG_PRETIMO_40_MIN;
+ break;
+ }
+
+ switch (charger->tolal_time_out) {
+ case 4:
+ value |= APCH_CFG_TOTTIMO_4_HOUR;
+ break;
+ case 5:
+ value |= APCH_CFG_TOTTIMO_5_HOUR;
+ break;
+ case 0:
+ value |= APCH_CFG_TOTTIMO_DISABLED;
+ break;
+ case 3:
+ default:
+ value |= APCH_CFG_TOTTIMO_3_HOUR;
+ break;
+ }
+
+ return regmap_write(regmap, ACT8945A_APCH_CFG, value);
+}
+
+static int act8945a_charger_probe(struct platform_device *pdev)
+{
+ struct act8945a_dev *act8945a_dev = dev_get_drvdata(pdev->dev.parent);
+ struct act8945a_charger *charger;
+ struct power_supply_config psy_cfg = {};
+ int ret;
+
+ charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);
+ if (!charger)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, charger);
+
+ charger->dev = &pdev->dev;
+ charger->act8945a_dev = act8945a_dev;
+
+ ret = act8945a_charger_parse_dt(&pdev->dev, charger);
+ if (ret)
+ return ret;
+
+ ret = act8945a_charger_config(charger);
+ if (ret)
+ return ret;
+
+ psy_cfg.of_node = pdev->dev.of_node;
+ psy_cfg.drv_data = charger;
+
+ charger->psy = power_supply_register(&pdev->dev,
+ &act8945a_charger_desc,
+ &psy_cfg);
+ if (IS_ERR(charger->psy)) {
+ dev_err(act8945a_dev->dev, "failed to register power supply\n");
+ return PTR_ERR(charger->psy);
+ }
+
+ dev_info(act8945a_dev->dev, "charger driver registered\n");
+
+ return 0;
+}
+
+static int act8945a_charger_remove(struct platform_device *pdev)
+{
+ struct act8945a_charger *charger = platform_get_drvdata(pdev);
+
+ power_supply_unregister(charger->psy);
+
+ return 0;
+}
+
+static struct platform_driver act8945a_charger_driver = {
+ .driver = {
+ .name = "act8945a-charger",
+ },
+ .probe = act8945a_charger_probe,
+ .remove = act8945a_charger_remove,
+};
+
+static int __init act8945a_charger_init(void)
+{
+ return platform_driver_register(&act8945a_charger_driver);
+}
+subsys_initcall(act8945a_charger_init);
+
+static void __exit act8945a_charger_cleanup(void)
+{
+ platform_driver_unregister(&act8945a_charger_driver);
+}
+module_exit(act8945a_charger_cleanup);
+
+MODULE_DESCRIPTION("Active-semi ACT8945A ActivePath charger driver");
+MODULE_AUTHOR("Wenyou Yang <wenyou.yang@atmel.com>");
+MODULE_LICENSE("GPL v2");