summaryrefslogtreecommitdiff
path: root/drivers/power/rt5033_battery.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/power/rt5033_battery.c')
-rw-r--r--drivers/power/rt5033_battery.c177
1 files changed, 177 insertions, 0 deletions
diff --git a/drivers/power/rt5033_battery.c b/drivers/power/rt5033_battery.c
new file mode 100644
index 000000000000..7b898f41c595
--- /dev/null
+++ b/drivers/power/rt5033_battery.c
@@ -0,0 +1,177 @@
+/*
+ * Fuel gauge driver for Richtek RT5033
+ *
+ * Copyright (C) 2014 Samsung Electronics, Co., Ltd.
+ * Author: Beomho Seo <beomho.seo@samsung.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published bythe Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/mfd/rt5033-private.h>
+#include <linux/mfd/rt5033.h>
+
+static int rt5033_battery_get_capacity(struct i2c_client *client)
+{
+ struct rt5033_battery *battery = i2c_get_clientdata(client);
+ u32 msb;
+
+ regmap_read(battery->regmap, RT5033_FUEL_REG_SOC_H, &msb);
+
+ return msb;
+}
+
+static int rt5033_battery_get_present(struct i2c_client *client)
+{
+ struct rt5033_battery *battery = i2c_get_clientdata(client);
+ u32 val;
+
+ regmap_read(battery->regmap, RT5033_FUEL_REG_CONFIG_L, &val);
+
+ return (val & RT5033_FUEL_BAT_PRESENT) ? true : false;
+}
+
+static int rt5033_battery_get_watt_prop(struct i2c_client *client,
+ enum power_supply_property psp)
+{
+ struct rt5033_battery *battery = i2c_get_clientdata(client);
+ unsigned int regh, regl;
+ int ret;
+ u32 msb, lsb;
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ regh = RT5033_FUEL_REG_VBAT_H;
+ regl = RT5033_FUEL_REG_VBAT_L;
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_AVG:
+ regh = RT5033_FUEL_REG_AVG_VOLT_H;
+ regl = RT5033_FUEL_REG_AVG_VOLT_L;
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_OCV:
+ regh = RT5033_FUEL_REG_OCV_H;
+ regl = RT5033_FUEL_REG_OCV_L;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ regmap_read(battery->regmap, regh, &msb);
+ regmap_read(battery->regmap, regl, &lsb);
+
+ ret = ((msb << 4) + (lsb >> 4)) * 1250 / 1000;
+
+ return ret;
+}
+
+static int rt5033_battery_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct rt5033_battery *battery = container_of(psy,
+ struct rt5033_battery, psy);
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ case POWER_SUPPLY_PROP_VOLTAGE_AVG:
+ case POWER_SUPPLY_PROP_VOLTAGE_OCV:
+ val->intval = rt5033_battery_get_watt_prop(battery->client,
+ psp);
+ break;
+ case POWER_SUPPLY_PROP_PRESENT:
+ val->intval = rt5033_battery_get_present(battery->client);
+ break;
+ case POWER_SUPPLY_PROP_CAPACITY:
+ val->intval = rt5033_battery_get_capacity(battery->client);
+ break;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static enum power_supply_property rt5033_battery_props[] = {
+ POWER_SUPPLY_PROP_VOLTAGE_NOW,
+ POWER_SUPPLY_PROP_VOLTAGE_AVG,
+ POWER_SUPPLY_PROP_VOLTAGE_OCV,
+ POWER_SUPPLY_PROP_PRESENT,
+ POWER_SUPPLY_PROP_CAPACITY,
+};
+
+static struct regmap_config rt5033_battery_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = RT5033_FUEL_REG_END,
+};
+
+static int rt5033_battery_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
+ struct rt5033_battery *battery;
+ u32 ret;
+
+ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
+ return -EIO;
+
+ battery = devm_kzalloc(&client->dev, sizeof(*battery), GFP_KERNEL);
+ if (!battery)
+ return -EINVAL;
+
+ battery->client = client;
+ battery->regmap = devm_regmap_init_i2c(client,
+ &rt5033_battery_regmap_config);
+ if (IS_ERR(battery->regmap)) {
+ dev_err(&client->dev, "Failed to initialize regmap\n");
+ return -EINVAL;
+ }
+
+ i2c_set_clientdata(client, battery);
+
+ battery->psy.name = "rt5033-battery";
+ battery->psy.type = POWER_SUPPLY_TYPE_BATTERY;
+ battery->psy.get_property = rt5033_battery_get_property;
+ battery->psy.properties = rt5033_battery_props;
+ battery->psy.num_properties = ARRAY_SIZE(rt5033_battery_props);
+
+ ret = power_supply_register(&client->dev, &battery->psy);
+ if (ret) {
+ dev_err(&client->dev, "Failed to register power supply\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static int rt5033_battery_remove(struct i2c_client *client)
+{
+ struct rt5033_battery *battery = i2c_get_clientdata(client);
+
+ power_supply_unregister(&battery->psy);
+
+ return 0;
+}
+
+static const struct i2c_device_id rt5033_battery_id[] = {
+ { "rt5033-battery", },
+ { }
+};
+MODULE_DEVICE_TABLE(platform, rt5033_battery_id);
+
+static struct i2c_driver rt5033_battery_driver = {
+ .driver = {
+ .name = "rt5033-battery",
+ },
+ .probe = rt5033_battery_probe,
+ .remove = rt5033_battery_remove,
+ .id_table = rt5033_battery_id,
+};
+module_i2c_driver(rt5033_battery_driver);
+
+MODULE_DESCRIPTION("Richtek RT5033 fuel gauge driver");
+MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>");
+MODULE_LICENSE("GPL");