298 lines
6.8 KiB
C
298 lines
6.8 KiB
C
/*
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* max17040_battery.c
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* fuel-gauge systems for lithium-ion (Li+) batteries
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*
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* Copyright (C) 2009 Samsung Electronics
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* Minkyu Kang <mk7.kang@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/mutex.h>
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#include <linux/err.h>
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#include <linux/i2c.h>
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#include <linux/delay.h>
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#include <linux/power_supply.h>
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#include <linux/max17040_battery.h>
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#include <linux/slab.h>
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#define MAX17040_VCELL_MSB 0x02
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#define MAX17040_VCELL_LSB 0x03
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#define MAX17040_SOC_MSB 0x04
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#define MAX17040_SOC_LSB 0x05
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#define MAX17040_MODE_MSB 0x06
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#define MAX17040_MODE_LSB 0x07
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#define MAX17040_VER_MSB 0x08
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#define MAX17040_VER_LSB 0x09
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#define MAX17040_RCOMP_MSB 0x0C
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#define MAX17040_RCOMP_LSB 0x0D
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#define MAX17040_CMD_MSB 0xFE
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#define MAX17040_CMD_LSB 0xFF
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#define MAX17040_DELAY 1000
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#define MAX17040_BATTERY_FULL 95
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struct max17040_chip {
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struct i2c_client *client;
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struct delayed_work work;
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struct power_supply battery;
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struct max17040_platform_data *pdata;
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/* State Of Connect */
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int online;
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/* battery voltage */
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int vcell;
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/* battery capacity */
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int soc;
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/* State Of Charge */
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int status;
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};
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static int max17040_get_property(struct power_supply *psy,
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enum power_supply_property psp,
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union power_supply_propval *val)
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{
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struct max17040_chip *chip = container_of(psy,
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struct max17040_chip, battery);
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switch (psp) {
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case POWER_SUPPLY_PROP_STATUS:
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val->intval = chip->status;
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break;
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case POWER_SUPPLY_PROP_ONLINE:
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val->intval = chip->online;
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_NOW:
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val->intval = chip->vcell;
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break;
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case POWER_SUPPLY_PROP_CAPACITY:
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val->intval = chip->soc;
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static int max17040_write_reg(struct i2c_client *client, int reg, u8 value)
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{
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int ret;
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ret = i2c_smbus_write_byte_data(client, reg, value);
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if (ret < 0)
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dev_err(&client->dev, "%s: err %d\n", __func__, ret);
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return ret;
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}
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static int max17040_read_reg(struct i2c_client *client, int reg)
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{
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int ret;
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ret = i2c_smbus_read_byte_data(client, reg);
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if (ret < 0)
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dev_err(&client->dev, "%s: err %d\n", __func__, ret);
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return ret;
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}
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static void max17040_reset(struct i2c_client *client)
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{
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max17040_write_reg(client, MAX17040_CMD_MSB, 0x54);
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max17040_write_reg(client, MAX17040_CMD_LSB, 0x00);
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}
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static void max17040_get_vcell(struct i2c_client *client)
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{
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struct max17040_chip *chip = i2c_get_clientdata(client);
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u8 msb;
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u8 lsb;
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msb = max17040_read_reg(client, MAX17040_VCELL_MSB);
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lsb = max17040_read_reg(client, MAX17040_VCELL_LSB);
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chip->vcell = (msb << 4) + (lsb >> 4);
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}
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static void max17040_get_soc(struct i2c_client *client)
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{
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struct max17040_chip *chip = i2c_get_clientdata(client);
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u8 msb;
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u8 lsb;
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msb = max17040_read_reg(client, MAX17040_SOC_MSB);
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lsb = max17040_read_reg(client, MAX17040_SOC_LSB);
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chip->soc = msb;
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}
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static void max17040_get_version(struct i2c_client *client)
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{
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u8 msb;
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u8 lsb;
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msb = max17040_read_reg(client, MAX17040_VER_MSB);
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lsb = max17040_read_reg(client, MAX17040_VER_LSB);
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dev_info(&client->dev, "MAX17040 Fuel-Gauge Ver %d%d\n", msb, lsb);
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}
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static void max17040_get_online(struct i2c_client *client)
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{
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struct max17040_chip *chip = i2c_get_clientdata(client);
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if (chip->pdata->battery_online)
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chip->online = chip->pdata->battery_online();
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else
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chip->online = 1;
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}
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static void max17040_get_status(struct i2c_client *client)
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{
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struct max17040_chip *chip = i2c_get_clientdata(client);
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if (!chip->pdata->charger_online || !chip->pdata->charger_enable) {
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chip->status = POWER_SUPPLY_STATUS_UNKNOWN;
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return;
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}
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if (chip->pdata->charger_online()) {
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if (chip->pdata->charger_enable())
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chip->status = POWER_SUPPLY_STATUS_CHARGING;
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else
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chip->status = POWER_SUPPLY_STATUS_NOT_CHARGING;
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} else {
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chip->status = POWER_SUPPLY_STATUS_DISCHARGING;
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}
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if (chip->soc > MAX17040_BATTERY_FULL)
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chip->status = POWER_SUPPLY_STATUS_FULL;
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}
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static void max17040_work(struct work_struct *work)
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{
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struct max17040_chip *chip;
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chip = container_of(work, struct max17040_chip, work.work);
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max17040_get_vcell(chip->client);
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max17040_get_soc(chip->client);
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max17040_get_online(chip->client);
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max17040_get_status(chip->client);
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schedule_delayed_work(&chip->work, MAX17040_DELAY);
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}
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static enum power_supply_property max17040_battery_props[] = {
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POWER_SUPPLY_PROP_STATUS,
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POWER_SUPPLY_PROP_ONLINE,
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POWER_SUPPLY_PROP_VOLTAGE_NOW,
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POWER_SUPPLY_PROP_CAPACITY,
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};
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static int max17040_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
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struct max17040_chip *chip;
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int ret;
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
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return -EIO;
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chip = kzalloc(sizeof(*chip), GFP_KERNEL);
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if (!chip)
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return -ENOMEM;
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chip->client = client;
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chip->pdata = client->dev.platform_data;
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i2c_set_clientdata(client, chip);
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chip->battery.name = "battery";
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chip->battery.type = POWER_SUPPLY_TYPE_BATTERY;
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chip->battery.get_property = max17040_get_property;
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chip->battery.properties = max17040_battery_props;
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chip->battery.num_properties = ARRAY_SIZE(max17040_battery_props);
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ret = power_supply_register(&client->dev, &chip->battery);
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if (ret) {
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dev_err(&client->dev, "failed: power supply register\n");
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kfree(chip);
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return ret;
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}
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max17040_reset(client);
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max17040_get_version(client);
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INIT_DEFERRABLE_WORK(&chip->work, max17040_work);
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schedule_delayed_work(&chip->work, MAX17040_DELAY);
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return 0;
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}
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static int max17040_remove(struct i2c_client *client)
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{
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struct max17040_chip *chip = i2c_get_clientdata(client);
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power_supply_unregister(&chip->battery);
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cancel_delayed_work(&chip->work);
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kfree(chip);
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return 0;
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}
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#ifdef CONFIG_PM
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static int max17040_suspend(struct i2c_client *client,
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pm_message_t state)
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{
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struct max17040_chip *chip = i2c_get_clientdata(client);
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cancel_delayed_work(&chip->work);
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return 0;
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}
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static int max17040_resume(struct i2c_client *client)
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{
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struct max17040_chip *chip = i2c_get_clientdata(client);
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schedule_delayed_work(&chip->work, MAX17040_DELAY);
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return 0;
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}
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#else
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#define max17040_suspend NULL
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#define max17040_resume NULL
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#endif /* CONFIG_PM */
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static const struct i2c_device_id max17040_id[] = {
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{ "max17040", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, max17040_id);
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static struct i2c_driver max17040_i2c_driver = {
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.driver = {
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.name = "max17040",
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},
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.probe = max17040_probe,
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.remove = max17040_remove,
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.suspend = max17040_suspend,
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.resume = max17040_resume,
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.id_table = max17040_id,
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};
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module_i2c_driver(max17040_i2c_driver);
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MODULE_AUTHOR("Minkyu Kang <mk7.kang@samsung.com>");
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MODULE_DESCRIPTION("MAX17040 Fuel Gauge");
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MODULE_LICENSE("GPL");
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