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path: root/drivers/power/supply/max17040_battery.c
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Diffstat (limited to 'drivers/power/supply/max17040_battery.c')
-rw-r--r--drivers/power/supply/max17040_battery.c305
1 files changed, 305 insertions, 0 deletions
diff --git a/drivers/power/supply/max17040_battery.c b/drivers/power/supply/max17040_battery.c
new file mode 100644
index 000000000000..8689c80202b5
--- /dev/null
+++ b/drivers/power/supply/max17040_battery.c
@@ -0,0 +1,305 @@
+/*
+ * max17040_battery.c
+ * fuel-gauge systems for lithium-ion (Li+) batteries
+ *
+ * Copyright (C) 2009 Samsung Electronics
+ * Minkyu Kang <mk7.kang@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 by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/mutex.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/delay.h>
+#include <linux/power_supply.h>
+#include <linux/max17040_battery.h>
+#include <linux/slab.h>
+
+#define MAX17040_VCELL_MSB 0x02
+#define MAX17040_VCELL_LSB 0x03
+#define MAX17040_SOC_MSB 0x04
+#define MAX17040_SOC_LSB 0x05
+#define MAX17040_MODE_MSB 0x06
+#define MAX17040_MODE_LSB 0x07
+#define MAX17040_VER_MSB 0x08
+#define MAX17040_VER_LSB 0x09
+#define MAX17040_RCOMP_MSB 0x0C
+#define MAX17040_RCOMP_LSB 0x0D
+#define MAX17040_CMD_MSB 0xFE
+#define MAX17040_CMD_LSB 0xFF
+
+#define MAX17040_DELAY 1000
+#define MAX17040_BATTERY_FULL 95
+
+struct max17040_chip {
+ struct i2c_client *client;
+ struct delayed_work work;
+ struct power_supply *battery;
+ struct max17040_platform_data *pdata;
+
+ /* State Of Connect */
+ int online;
+ /* battery voltage */
+ int vcell;
+ /* battery capacity */
+ int soc;
+ /* State Of Charge */
+ int status;
+};
+
+static int max17040_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct max17040_chip *chip = power_supply_get_drvdata(psy);
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_STATUS:
+ val->intval = chip->status;
+ break;
+ case POWER_SUPPLY_PROP_ONLINE:
+ val->intval = chip->online;
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ val->intval = chip->vcell;
+ break;
+ case POWER_SUPPLY_PROP_CAPACITY:
+ val->intval = chip->soc;
+ break;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static int max17040_write_reg(struct i2c_client *client, int reg, u8 value)
+{
+ int ret;
+
+ ret = i2c_smbus_write_byte_data(client, reg, value);
+
+ if (ret < 0)
+ dev_err(&client->dev, "%s: err %d\n", __func__, ret);
+
+ return ret;
+}
+
+static int max17040_read_reg(struct i2c_client *client, int reg)
+{
+ int ret;
+
+ ret = i2c_smbus_read_byte_data(client, reg);
+
+ if (ret < 0)
+ dev_err(&client->dev, "%s: err %d\n", __func__, ret);
+
+ return ret;
+}
+
+static void max17040_reset(struct i2c_client *client)
+{
+ max17040_write_reg(client, MAX17040_CMD_MSB, 0x54);
+ max17040_write_reg(client, MAX17040_CMD_LSB, 0x00);
+}
+
+static void max17040_get_vcell(struct i2c_client *client)
+{
+ struct max17040_chip *chip = i2c_get_clientdata(client);
+ u8 msb;
+ u8 lsb;
+
+ msb = max17040_read_reg(client, MAX17040_VCELL_MSB);
+ lsb = max17040_read_reg(client, MAX17040_VCELL_LSB);
+
+ chip->vcell = (msb << 4) + (lsb >> 4);
+}
+
+static void max17040_get_soc(struct i2c_client *client)
+{
+ struct max17040_chip *chip = i2c_get_clientdata(client);
+ u8 msb;
+ u8 lsb;
+
+ msb = max17040_read_reg(client, MAX17040_SOC_MSB);
+ lsb = max17040_read_reg(client, MAX17040_SOC_LSB);
+
+ chip->soc = msb;
+}
+
+static void max17040_get_version(struct i2c_client *client)
+{
+ u8 msb;
+ u8 lsb;
+
+ msb = max17040_read_reg(client, MAX17040_VER_MSB);
+ lsb = max17040_read_reg(client, MAX17040_VER_LSB);
+
+ dev_info(&client->dev, "MAX17040 Fuel-Gauge Ver %d%d\n", msb, lsb);
+}
+
+static void max17040_get_online(struct i2c_client *client)
+{
+ struct max17040_chip *chip = i2c_get_clientdata(client);
+
+ if (chip->pdata && chip->pdata->battery_online)
+ chip->online = chip->pdata->battery_online();
+ else
+ chip->online = 1;
+}
+
+static void max17040_get_status(struct i2c_client *client)
+{
+ struct max17040_chip *chip = i2c_get_clientdata(client);
+
+ if (!chip->pdata || !chip->pdata->charger_online
+ || !chip->pdata->charger_enable) {
+ chip->status = POWER_SUPPLY_STATUS_UNKNOWN;
+ return;
+ }
+
+ if (chip->pdata->charger_online()) {
+ if (chip->pdata->charger_enable())
+ chip->status = POWER_SUPPLY_STATUS_CHARGING;
+ else
+ chip->status = POWER_SUPPLY_STATUS_NOT_CHARGING;
+ } else {
+ chip->status = POWER_SUPPLY_STATUS_DISCHARGING;
+ }
+
+ if (chip->soc > MAX17040_BATTERY_FULL)
+ chip->status = POWER_SUPPLY_STATUS_FULL;
+}
+
+static void max17040_work(struct work_struct *work)
+{
+ struct max17040_chip *chip;
+
+ chip = container_of(work, struct max17040_chip, work.work);
+
+ max17040_get_vcell(chip->client);
+ max17040_get_soc(chip->client);
+ max17040_get_online(chip->client);
+ max17040_get_status(chip->client);
+
+ queue_delayed_work(system_power_efficient_wq, &chip->work,
+ MAX17040_DELAY);
+}
+
+static enum power_supply_property max17040_battery_props[] = {
+ POWER_SUPPLY_PROP_STATUS,
+ POWER_SUPPLY_PROP_ONLINE,
+ POWER_SUPPLY_PROP_VOLTAGE_NOW,
+ POWER_SUPPLY_PROP_CAPACITY,
+};
+
+static const struct power_supply_desc max17040_battery_desc = {
+ .name = "battery",
+ .type = POWER_SUPPLY_TYPE_BATTERY,
+ .get_property = max17040_get_property,
+ .properties = max17040_battery_props,
+ .num_properties = ARRAY_SIZE(max17040_battery_props),
+};
+
+static int max17040_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
+ struct power_supply_config psy_cfg = {};
+ struct max17040_chip *chip;
+
+ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
+ return -EIO;
+
+ chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
+ if (!chip)
+ return -ENOMEM;
+
+ chip->client = client;
+ chip->pdata = client->dev.platform_data;
+
+ i2c_set_clientdata(client, chip);
+ psy_cfg.drv_data = chip;
+
+ chip->battery = power_supply_register(&client->dev,
+ &max17040_battery_desc, &psy_cfg);
+ if (IS_ERR(chip->battery)) {
+ dev_err(&client->dev, "failed: power supply register\n");
+ return PTR_ERR(chip->battery);
+ }
+
+ max17040_reset(client);
+ max17040_get_version(client);
+
+ INIT_DEFERRABLE_WORK(&chip->work, max17040_work);
+ queue_delayed_work(system_power_efficient_wq, &chip->work,
+ MAX17040_DELAY);
+
+ return 0;
+}
+
+static int max17040_remove(struct i2c_client *client)
+{
+ struct max17040_chip *chip = i2c_get_clientdata(client);
+
+ power_supply_unregister(chip->battery);
+ cancel_delayed_work(&chip->work);
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+
+static int max17040_suspend(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct max17040_chip *chip = i2c_get_clientdata(client);
+
+ cancel_delayed_work(&chip->work);
+ return 0;
+}
+
+static int max17040_resume(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct max17040_chip *chip = i2c_get_clientdata(client);
+
+ queue_delayed_work(system_power_efficient_wq, &chip->work,
+ MAX17040_DELAY);
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(max17040_pm_ops, max17040_suspend, max17040_resume);
+#define MAX17040_PM_OPS (&max17040_pm_ops)
+
+#else
+
+#define MAX17040_PM_OPS NULL
+
+#endif /* CONFIG_PM_SLEEP */
+
+static const struct i2c_device_id max17040_id[] = {
+ { "max17040" },
+ { "max77836-battery" },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, max17040_id);
+
+static struct i2c_driver max17040_i2c_driver = {
+ .driver = {
+ .name = "max17040",
+ .pm = MAX17040_PM_OPS,
+ },
+ .probe = max17040_probe,
+ .remove = max17040_remove,
+ .id_table = max17040_id,
+};
+module_i2c_driver(max17040_i2c_driver);
+
+MODULE_AUTHOR("Minkyu Kang <mk7.kang@samsung.com>");
+MODULE_DESCRIPTION("MAX17040 Fuel Gauge");
+MODULE_LICENSE("GPL");