power_supply: Add charger driver for MAX8997/8966

MAX8997/8966 chip is a multi-function device which includes
PMIC, RTC, Fuel Gauge, MUIC, Haptic, Flash control, and
Battery charging control.
The driver for it is located at drivers/mfd.

This patch supports battery charging control of MAX8997/8966 chip and
provides power supply class information to userspace.

Signed-off-by: Donggeun Kim <dg77.kim@samsung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: KyungMin Park <kyungmin.park@samsung.com>
Acked-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>

4 files changed, 220 insertions, 1 deletions

diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
index cc019c9812c2..f4f1a31d46a3 100644
--- a/drivers/power/Kconfig
+++ b/drivers/power/Kconfig
@@ -228,4 +228,11 @@ config CHARGER_GPIO
           This driver can be build as a module. If so, the module will be
           called gpio-charger.
 
+config CHARGER_MAX8997
+        tristate "Maxim MAX8997/MAX8966 PMIC battery charger driver"
+        depends on MFD_MAX8997 && REGULATOR_MAX8997
+        help
+          Say Y to enable support for the battery charger control sysfs and
+          platform data of MAX8997/LP3974 PMICs.
+
 endif # POWER_SUPPLY
diff --git a/drivers/power/Makefile b/drivers/power/Makefile
index 8fcd93ff2353..39793ef50cd5 100644
--- a/drivers/power/Makefile
+++ b/drivers/power/Makefile
@@ -35,3 +35,4 @@ obj-$(CONFIG_CHARGER_ISP1704)	+= isp1704_charger.o
 obj-$(CONFIG_CHARGER_MAX8903)   += max8903_charger.o
 obj-$(CONFIG_CHARGER_TWL4030)   += twl4030_charger.o
 obj-$(CONFIG_CHARGER_GPIO)      += gpio-charger.o
+obj-$(CONFIG_CHARGER_MAX8997)   += max8997_charger.o
diff --git a/drivers/power/max8997_charger.c b/drivers/power/max8997_charger.c
new file mode 100644
index 000000000000..7106b49b26e4
--- /dev/null
+++ b/drivers/power/max8997_charger.c
@@ -0,0 +1,206 @@
+/*
+ * max8997_charger.c - Power supply consumer driver for the Maxim 8997/8966
+ *
+ *  Copyright (C) 2011 Samsung Electronics
+ *  MyungJoo Ham <myungjoo.ham@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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/mfd/max8997.h>
+#include <linux/mfd/max8997-private.h>
+
+struct charger_data {
+        struct device *dev;
+        struct max8997_dev *iodev;
+        struct power_supply battery;
+};
+
+static enum power_supply_property max8997_battery_props[] = {
+        POWER_SUPPLY_PROP_STATUS, /* "FULL" or "NOT FULL" only. */
+        POWER_SUPPLY_PROP_PRESENT, /* the presence of battery */
+        POWER_SUPPLY_PROP_ONLINE, /* charger is active or not */
+};
+
+/* Note that the charger control is done by a current regulator "CHARGER" */
+static int max8997_battery_get_property(struct power_supply *psy,
+                enum power_supply_property psp,
+                union power_supply_propval *val)
+{
+        struct charger_data *charger = container_of(psy,
+                        struct charger_data, battery);
+        struct i2c_client *i2c = charger->iodev->i2c;
+        int ret;
+        u8 reg;
+
+        switch (psp) {
+        case POWER_SUPPLY_PROP_STATUS:
+                val->intval = 0;
+                ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
+                if (ret)
+                        return ret;
+                if ((reg & (1 << 0)) == 0x1)
+                        val->intval = POWER_SUPPLY_STATUS_FULL;
+
+                break;
+        case POWER_SUPPLY_PROP_PRESENT:
+                val->intval = 0;
+                ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
+                if (ret)
+                        return ret;
+                if ((reg & (1 << 2)) == 0x0)
+                        val->intval = 1;
+
+                break;
+        case POWER_SUPPLY_PROP_ONLINE:
+                val->intval = 0;
+                ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
+                if (ret)
+                        return ret;
+                /* DCINOK */
+                if (reg & (1 << 1))
+                        val->intval = 1;
+
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        return 0;
+}
+
+static __devinit int max8997_battery_probe(struct platform_device *pdev)
+{
+        int ret = 0;
+        struct charger_data *charger;
+        struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
+        struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev);
+
+        if (!pdata)
+                return -EINVAL;
+
+        if (pdata->eoc_mA) {
+                u8 val = (pdata->eoc_mA - 50) / 10;
+                if (val < 0)
+                        val = 0;
+                if (val > 0xf)
+                        val = 0xf;
+
+                ret = max8997_update_reg(iodev->i2c,
+                                MAX8997_REG_MBCCTRL5, val, 0xf);
+                if (ret < 0) {
+                        dev_err(&pdev->dev, "Cannot use i2c bus.\n");
+                        return ret;
+                }
+        }
+
+        switch (pdata->timeout) {
+        case 5:
+                ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
+                                0x2 << 4, 0x7 << 4);
+                break;
+        case 6:
+                ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
+                                0x3 << 4, 0x7 << 4);
+                break;
+        case 7:
+                ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
+                                0x4 << 4, 0x7 << 4);
+                break;
+        case 0:
+                ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
+                                0x7 << 4, 0x7 << 4);
+                break;
+        default:
+                dev_err(&pdev->dev, "incorrect timeout value (%d)\n",
+                                pdata->timeout);
+                return -EINVAL;
+        }
+        if (ret < 0) {
+                dev_err(&pdev->dev, "Cannot use i2c bus.\n");
+                return ret;
+        }
+
+        charger = kzalloc(sizeof(struct charger_data), GFP_KERNEL);
+        if (charger == NULL) {
+                dev_err(&pdev->dev, "Cannot allocate memory.\n");
+                return -ENOMEM;
+        }
+
+        platform_set_drvdata(pdev, charger);
+
+        charger->battery.name = "max8997_pmic";
+        charger->battery.type = POWER_SUPPLY_TYPE_BATTERY;
+        charger->battery.get_property = max8997_battery_get_property;
+        charger->battery.properties = max8997_battery_props;
+        charger->battery.num_properties = ARRAY_SIZE(max8997_battery_props);
+
+        charger->dev = &pdev->dev;
+        charger->iodev = iodev;
+
+        ret = power_supply_register(&pdev->dev, &charger->battery);
+        if (ret) {
+                dev_err(&pdev->dev, "failed: power supply register\n");
+                goto err;
+        }
+
+        return 0;
+err:
+        kfree(charger);
+        return ret;
+}
+
+static int __devexit max8997_battery_remove(struct platform_device *pdev)
+{
+        struct charger_data *charger = platform_get_drvdata(pdev);
+
+        power_supply_unregister(&charger->battery);
+        kfree(charger);
+        return 0;
+}
+
+static const struct platform_device_id max8997_battery_id[] = {
+        { "max8997-battery", 0 },
+};
+
+static struct platform_driver max8997_battery_driver = {
+        .driver = {
+                .name = "max8997-battery",
+                .owner = THIS_MODULE,
+        },
+        .probe = max8997_battery_probe,
+        .remove = __devexit_p(max8997_battery_remove),
+        .id_table = max8997_battery_id,
+};
+
+static int __init max8997_battery_init(void)
+{
+        return platform_driver_register(&max8997_battery_driver);
+}
+subsys_initcall(max8997_battery_init);
+
+static void __exit max8997_battery_cleanup(void)
+{
+        platform_driver_unregister(&max8997_battery_driver);
+}
+module_exit(max8997_battery_cleanup);
+
+MODULE_DESCRIPTION("MAXIM 8997/8966 battery control driver");
+MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/mfd/max8997.h b/include/linux/mfd/max8997.h
index 60931d089422..0bbd13dbe336 100644
--- a/include/linux/mfd/max8997.h
+++ b/include/linux/mfd/max8997.h
@@ -107,11 +107,16 @@ struct max8997_platform_data {
         unsigned int buck5_voltage[8];
         bool buck5_gpiodvs;
 
+        /* ---- Charger control ---- */
+        /* eoc stands for 'end of charge' */
+        int eoc_mA; /* 50 ~ 200mA by 10mA step */
+        /* charge Full Timeout */
+        int timeout; /* 0 (no timeout), 5, 6, 7 hours */
+
         /* MUIC: Not implemented */
         /* HAPTIC: Not implemented */
         /* RTC: Not implemented */
         /* Flash: Not implemented */
-        /* Charger control: Not implemented */
 };
 
 #endif /* __LINUX_MFD_MAX8998_H */