power_supply: Add charger support for Maxim 14577

MAX14577 chip is a multi-function device which includes MUIC, charger and
voltage regulator. The driver is located in drivers/mfd.

This patch supports battery charging control of MAX14577 chip and provides
power supply class information to userspace.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Anton Vorontsov <anton@enomsg.org>

3 files changed, 319 insertions, 0 deletions

diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
index 85ad58c6da17..0196acf05231 100644
--- a/drivers/power/Kconfig
+++ b/drivers/power/Kconfig
@@ -317,6 +317,13 @@ config CHARGER_MANAGER
           runtime and in suspend-to-RAM by waking up the system periodically
           with help of suspend_again support.
 
+config CHARGER_MAX14577
+        tristate "Maxim MAX14577 MUIC battery charger driver"
+        depends on MFD_MAX14577
+        help
+          Say Y to enable support for the battery charger control sysfs and
+          platform data of MAX14577 MUICs.
+
 config CHARGER_MAX8997
         tristate "Maxim MAX8997/MAX8966 PMIC battery charger driver"
         depends on MFD_MAX8997 && REGULATOR_MAX8997
diff --git a/drivers/power/Makefile b/drivers/power/Makefile
index 372b4e8ab598..ee54a3e4c90a 100644
--- a/drivers/power/Makefile
+++ b/drivers/power/Makefile
@@ -48,6 +48,7 @@ obj-$(CONFIG_CHARGER_LP8727)	+= lp8727_charger.o
 obj-$(CONFIG_CHARGER_LP8788)    += lp8788-charger.o
 obj-$(CONFIG_CHARGER_GPIO)      += gpio-charger.o
 obj-$(CONFIG_CHARGER_MANAGER)   += charger-manager.o
+obj-$(CONFIG_CHARGER_MAX14577)  += max14577_charger.o
 obj-$(CONFIG_CHARGER_MAX8997)   += max8997_charger.o
 obj-$(CONFIG_CHARGER_MAX8998)   += max8998_charger.o
 obj-$(CONFIG_CHARGER_BQ2415X)   += bq2415x_charger.o
diff --git a/drivers/power/max14577_charger.c b/drivers/power/max14577_charger.c
new file mode 100644
index 000000000000..fad2a75b3604
--- /dev/null
+++ b/drivers/power/max14577_charger.c
@@ -0,0 +1,311 @@
+/*
+ * Battery charger driver for the Maxim 14577
+ *
+ * Copyright (C) 2013 Samsung Electronics
+ * Krzysztof Kozlowski <k.kozlowski@samsung.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/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/mfd/max14577-private.h>
+
+struct max14577_charger {
+        struct device *dev;
+        struct max14577 *max14577;
+        struct power_supply     charger;
+
+        unsigned int    charging_state;
+        unsigned int    battery_state;
+};
+
+static int max14577_get_charger_state(struct max14577_charger *chg)
+{
+        struct regmap *rmap = chg->max14577->regmap;
+        int state = POWER_SUPPLY_STATUS_DISCHARGING;
+        u8 reg_data;
+
+        /*
+         * Charging occurs only if:
+         *  - CHGCTRL2/MBCHOSTEN == 1
+         *  - STATUS2/CGMBC == 1
+         *
+         * TODO:
+         *  - handle FULL after Top-off timer (EOC register may be off
+         *    and the charger won't be charging although MBCHOSTEN is on)
+         *  - handle properly dead-battery charging (respect timer)
+         *  - handle timers (fast-charge and prequal) /MBCCHGERR/
+         */
+        max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL2, &reg_data);
+        if ((reg_data & CHGCTRL2_MBCHOSTEN_MASK) == 0)
+                goto state_set;
+
+        max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, &reg_data);
+        if (reg_data & STATUS3_CGMBC_MASK) {
+                /* Charger or USB-cable is connected */
+                if (reg_data & STATUS3_EOC_MASK)
+                        state = POWER_SUPPLY_STATUS_FULL;
+                else
+                        state = POWER_SUPPLY_STATUS_CHARGING;
+                goto state_set;
+        }
+
+state_set:
+        chg->charging_state = state;
+        return state;
+}
+
+/*
+ * Supported charge types:
+ *  - POWER_SUPPLY_CHARGE_TYPE_NONE
+ *  - POWER_SUPPLY_CHARGE_TYPE_FAST
+ */
+static int max14577_get_charge_type(struct max14577_charger *chg)
+{
+        /*
+         * TODO: CHARGE_TYPE_TRICKLE (VCHGR_RC or EOC)?
+         * As spec says:
+         * [after reaching EOC interrupt]
+         * "When the battery is fully charged, the 30-minute (typ)
+         *  top-off timer starts. The device continues to trickle
+         *  charge the battery until the top-off timer runs out."
+         */
+        if (max14577_get_charger_state(chg) == POWER_SUPPLY_STATUS_CHARGING)
+                return POWER_SUPPLY_CHARGE_TYPE_FAST;
+        return POWER_SUPPLY_CHARGE_TYPE_NONE;
+}
+
+static int max14577_get_online(struct max14577_charger *chg)
+{
+        struct regmap *rmap = chg->max14577->regmap;
+        u8 reg_data;
+
+        max14577_read_reg(rmap, MAX14577_MUIC_REG_STATUS2, &reg_data);
+        reg_data = ((reg_data & STATUS2_CHGTYP_MASK) >> STATUS2_CHGTYP_SHIFT);
+        switch (reg_data) {
+        case MAX14577_CHARGER_TYPE_USB:
+        case MAX14577_CHARGER_TYPE_DEDICATED_CHG:
+        case MAX14577_CHARGER_TYPE_SPECIAL_500MA:
+        case MAX14577_CHARGER_TYPE_SPECIAL_1A:
+        case MAX14577_CHARGER_TYPE_DEAD_BATTERY:
+                return 1;
+        case MAX14577_CHARGER_TYPE_NONE:
+        case MAX14577_CHARGER_TYPE_DOWNSTREAM_PORT:
+        case MAX14577_CHARGER_TYPE_RESERVED:
+        default:
+                return 0;
+        }
+}
+
+/*
+ * Supported health statuses:
+ *  - POWER_SUPPLY_HEALTH_DEAD
+ *  - POWER_SUPPLY_HEALTH_OVERVOLTAGE
+ *  - POWER_SUPPLY_HEALTH_GOOD
+ */
+static int max14577_get_battery_health(struct max14577_charger *chg)
+{
+        struct regmap *rmap = chg->max14577->regmap;
+        int state = POWER_SUPPLY_HEALTH_GOOD;
+        u8 reg_data;
+
+        max14577_read_reg(rmap, MAX14577_MUIC_REG_STATUS2, &reg_data);
+        reg_data = ((reg_data & STATUS2_CHGTYP_MASK) >> STATUS2_CHGTYP_SHIFT);
+        if (reg_data == MAX14577_CHARGER_TYPE_DEAD_BATTERY) {
+                state = POWER_SUPPLY_HEALTH_DEAD;
+                goto state_set;
+        }
+
+        max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, &reg_data);
+        if (reg_data & STATUS3_OVP_MASK) {
+                state = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
+                goto state_set;
+        }
+
+state_set:
+        chg->battery_state = state;
+        return state;
+}
+
+/*
+ * Always returns 1.
+ * The max14577 chip doesn't report any status of battery presence.
+ * Lets assume that it will always be used with some battery.
+ */
+static int max14577_get_present(struct max14577_charger *chg)
+{
+        return 1;
+}
+
+/*
+ * Sets charger registers to proper and safe default values.
+ * Some of these values are equal to defaults in MAX14577E
+ * data sheet but there are minor differences.
+ */
+static void max14577_charger_reg_init(struct max14577_charger *chg)
+{
+        struct regmap *rmap = chg->max14577->regmap;
+        u8 reg_data;
+
+        /*
+         * Charger-Type Manual Detection, default off (set CHGTYPMAN to 0)
+         * Charger-Detection Enable, default on (set CHGDETEN to 1)
+         * Combined mask of CHGDETEN and CHGTYPMAN will zero the CHGTYPMAN bit
+         */
+        reg_data = 0x1 << CDETCTRL1_CHGDETEN_SHIFT;
+        max14577_update_reg(rmap, MAX14577_REG_CDETCTRL1,
+                        CDETCTRL1_CHGDETEN_MASK | CDETCTRL1_CHGTYPMAN_MASK,
+                        reg_data);
+
+        /* Battery Fast-Charge Timer, from SM-V700: 6hrs */
+        reg_data = 0x3 << CHGCTRL1_TCHW_SHIFT;
+        max14577_write_reg(rmap, MAX14577_REG_CHGCTRL1, reg_data);
+
+        /*
+         * Wall-Adapter Rapid Charge, default on
+         * Battery-Charger, default on
+         */
+        reg_data = 0x1 << CHGCTRL2_VCHGR_RC_SHIFT;
+        reg_data |= 0x1 << CHGCTRL2_MBCHOSTEN_SHIFT;
+        max14577_write_reg(rmap, MAX14577_REG_CHGCTRL2, reg_data);
+
+        /* Battery-Charger Constant Voltage (CV) Mode, from SM-V700: 4.35V */
+        reg_data = 0xf << CHGCTRL3_MBCCVWRC_SHIFT;
+        max14577_write_reg(rmap, MAX14577_REG_CHGCTRL3, reg_data);
+
+        /*
+         * Fast Battery-Charge Current Low, default 200-950mA
+         * Fast Battery-Charge Current High, from SM-V700: 450mA
+         */
+        reg_data = 0x1 << CHGCTRL4_MBCICHWRCL_SHIFT;
+        reg_data |= 0x5 << CHGCTRL4_MBCICHWRCH_SHIFT;
+        max14577_write_reg(rmap, MAX14577_REG_CHGCTRL4, reg_data);
+
+        /* End-of-Charge Current, from SM-V700: 50mA */
+        reg_data = 0x0 << CHGCTRL5_EOCS_SHIFT;
+        max14577_write_reg(rmap, MAX14577_REG_CHGCTRL5, reg_data);
+
+        /* Auto Charging Stop, default off */
+        reg_data = 0x0 << CHGCTRL6_AUTOSTOP_SHIFT;
+        max14577_write_reg(rmap, MAX14577_REG_CHGCTRL6, reg_data);
+
+        /* Overvoltage-Protection Threshold, from SM-V700: 6.5V */
+        reg_data = 0x2 << CHGCTRL7_OTPCGHCVS_SHIFT;
+        max14577_write_reg(rmap, MAX14577_REG_CHGCTRL7, reg_data);
+}
+
+/* Support property from charger */
+static enum power_supply_property max14577_charger_props[] = {
+        POWER_SUPPLY_PROP_STATUS,
+        POWER_SUPPLY_PROP_CHARGE_TYPE,
+        POWER_SUPPLY_PROP_HEALTH,
+        POWER_SUPPLY_PROP_PRESENT,
+        POWER_SUPPLY_PROP_ONLINE,
+        POWER_SUPPLY_PROP_MODEL_NAME,
+        POWER_SUPPLY_PROP_MANUFACTURER,
+};
+
+static const char *model_name = "MAX14577";
+static const char *manufacturer = "Maxim Integrated";
+
+static int max14577_charger_get_property(struct power_supply *psy,
+                            enum power_supply_property psp,
+                            union power_supply_propval *val)
+{
+        struct max14577_charger *chg = container_of(psy,
+                                                  struct max14577_charger,
+                                                  charger);
+        int ret = 0;
+
+        switch (psp) {
+        case POWER_SUPPLY_PROP_STATUS:
+                val->intval = max14577_get_charger_state(chg);
+                break;
+        case POWER_SUPPLY_PROP_CHARGE_TYPE:
+                val->intval = max14577_get_charge_type(chg);
+                break;
+        case POWER_SUPPLY_PROP_HEALTH:
+                val->intval = max14577_get_battery_health(chg);
+                break;
+        case POWER_SUPPLY_PROP_PRESENT:
+                val->intval = max14577_get_present(chg);
+                break;
+        case POWER_SUPPLY_PROP_ONLINE:
+                val->intval = max14577_get_online(chg);
+                break;
+        case POWER_SUPPLY_PROP_MODEL_NAME:
+                val->strval = model_name;
+                break;
+        case POWER_SUPPLY_PROP_MANUFACTURER:
+                val->strval = manufacturer;
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        return ret;
+}
+
+static int max14577_charger_probe(struct platform_device *pdev)
+{
+        struct max14577_charger *chg;
+        struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent);
+        int ret;
+
+        chg = devm_kzalloc(&pdev->dev, sizeof(*chg), GFP_KERNEL);
+        if (!chg)
+                return -ENOMEM;
+
+        platform_set_drvdata(pdev, chg);
+        chg->dev = &pdev->dev;
+        chg->max14577 = max14577;
+
+        max14577_charger_reg_init(chg);
+
+        chg->charger.name = "max14577-charger",
+        chg->charger.type = POWER_SUPPLY_TYPE_BATTERY,
+        chg->charger.properties = max14577_charger_props,
+        chg->charger.num_properties = ARRAY_SIZE(max14577_charger_props),
+        chg->charger.get_property = max14577_charger_get_property,
+
+        ret = power_supply_register(&pdev->dev, &chg->charger);
+        if (ret) {
+                dev_err(&pdev->dev, "failed: power supply register\n");
+                return ret;
+        }
+
+        return 0;
+}
+
+static int max14577_charger_remove(struct platform_device *pdev)
+{
+        struct max14577_charger *chg = platform_get_drvdata(pdev);
+
+        power_supply_unregister(&chg->charger);
+
+        return 0;
+}
+
+static struct platform_driver max14577_charger_driver = {
+        .driver = {
+                .owner  = THIS_MODULE,
+                .name   = "max14577-charger",
+        },
+        .probe          = max14577_charger_probe,
+        .remove         = max14577_charger_remove,
+};
+module_platform_driver(max14577_charger_driver);
+
+MODULE_AUTHOR("Krzysztof Kozlowski <k.kozlowski@samsung.com>");
+MODULE_DESCRIPTION("MAXIM 14577 charger driver");
+MODULE_LICENSE("GPL");