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![Javier Martinez Canillas](/assets/img/avatar_default.png)
The I2C core always reports the MODALIAS uevent as "i2c:<client name" regardless if the driver was matched using the I2C id_table or the of_match_table. So the driver needs to export the I2C table and this be built into the module or udev won't have the necessary information to auto load the correct module when the device is added. Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com> Signed-off-by: Sebastian Reichel <sre@kernel.org>
182 lines
4.6 KiB
C
182 lines
4.6 KiB
C
/*
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* Fuel gauge driver for Richtek RT5033
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*
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* Copyright (C) 2014 Samsung Electronics, Co., Ltd.
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* Author: Beomho Seo <beomho.seo@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 bythe Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/power_supply.h>
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#include <linux/mfd/rt5033-private.h>
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#include <linux/mfd/rt5033.h>
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static int rt5033_battery_get_capacity(struct i2c_client *client)
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{
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struct rt5033_battery *battery = i2c_get_clientdata(client);
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u32 msb;
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regmap_read(battery->regmap, RT5033_FUEL_REG_SOC_H, &msb);
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return msb;
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}
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static int rt5033_battery_get_present(struct i2c_client *client)
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{
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struct rt5033_battery *battery = i2c_get_clientdata(client);
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u32 val;
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regmap_read(battery->regmap, RT5033_FUEL_REG_CONFIG_L, &val);
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return (val & RT5033_FUEL_BAT_PRESENT) ? true : false;
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}
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static int rt5033_battery_get_watt_prop(struct i2c_client *client,
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enum power_supply_property psp)
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{
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struct rt5033_battery *battery = i2c_get_clientdata(client);
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unsigned int regh, regl;
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int ret;
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u32 msb, lsb;
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switch (psp) {
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case POWER_SUPPLY_PROP_VOLTAGE_NOW:
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regh = RT5033_FUEL_REG_VBAT_H;
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regl = RT5033_FUEL_REG_VBAT_L;
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_AVG:
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regh = RT5033_FUEL_REG_AVG_VOLT_H;
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regl = RT5033_FUEL_REG_AVG_VOLT_L;
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_OCV:
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regh = RT5033_FUEL_REG_OCV_H;
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regl = RT5033_FUEL_REG_OCV_L;
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break;
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default:
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return -EINVAL;
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}
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regmap_read(battery->regmap, regh, &msb);
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regmap_read(battery->regmap, regl, &lsb);
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ret = ((msb << 4) + (lsb >> 4)) * 1250 / 1000;
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return ret;
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}
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static int rt5033_battery_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 rt5033_battery *battery = power_supply_get_drvdata(psy);
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switch (psp) {
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case POWER_SUPPLY_PROP_VOLTAGE_NOW:
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case POWER_SUPPLY_PROP_VOLTAGE_AVG:
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case POWER_SUPPLY_PROP_VOLTAGE_OCV:
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val->intval = rt5033_battery_get_watt_prop(battery->client,
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psp);
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break;
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case POWER_SUPPLY_PROP_PRESENT:
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val->intval = rt5033_battery_get_present(battery->client);
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break;
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case POWER_SUPPLY_PROP_CAPACITY:
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val->intval = rt5033_battery_get_capacity(battery->client);
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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 enum power_supply_property rt5033_battery_props[] = {
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POWER_SUPPLY_PROP_VOLTAGE_NOW,
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POWER_SUPPLY_PROP_VOLTAGE_AVG,
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POWER_SUPPLY_PROP_VOLTAGE_OCV,
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POWER_SUPPLY_PROP_PRESENT,
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POWER_SUPPLY_PROP_CAPACITY,
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};
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static const struct regmap_config rt5033_battery_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = RT5033_FUEL_REG_END,
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};
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static const struct power_supply_desc rt5033_battery_desc = {
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.name = "rt5033-battery",
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.type = POWER_SUPPLY_TYPE_BATTERY,
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.get_property = rt5033_battery_get_property,
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.properties = rt5033_battery_props,
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.num_properties = ARRAY_SIZE(rt5033_battery_props),
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};
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static int rt5033_battery_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 power_supply_config psy_cfg = {};
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struct rt5033_battery *battery;
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u32 ret;
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
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return -EIO;
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battery = devm_kzalloc(&client->dev, sizeof(*battery), GFP_KERNEL);
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if (!battery)
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return -EINVAL;
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battery->client = client;
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battery->regmap = devm_regmap_init_i2c(client,
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&rt5033_battery_regmap_config);
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if (IS_ERR(battery->regmap)) {
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dev_err(&client->dev, "Failed to initialize regmap\n");
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return -EINVAL;
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}
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i2c_set_clientdata(client, battery);
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psy_cfg.drv_data = battery;
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battery->psy = power_supply_register(&client->dev,
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&rt5033_battery_desc, &psy_cfg);
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if (IS_ERR(battery->psy)) {
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dev_err(&client->dev, "Failed to register power supply\n");
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ret = PTR_ERR(battery->psy);
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return ret;
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}
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return 0;
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}
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static int rt5033_battery_remove(struct i2c_client *client)
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{
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struct rt5033_battery *battery = i2c_get_clientdata(client);
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power_supply_unregister(battery->psy);
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return 0;
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}
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static const struct i2c_device_id rt5033_battery_id[] = {
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{ "rt5033-battery", },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, rt5033_battery_id);
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static struct i2c_driver rt5033_battery_driver = {
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.driver = {
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.name = "rt5033-battery",
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},
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.probe = rt5033_battery_probe,
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.remove = rt5033_battery_remove,
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.id_table = rt5033_battery_id,
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};
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module_i2c_driver(rt5033_battery_driver);
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MODULE_DESCRIPTION("Richtek RT5033 fuel gauge driver");
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MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>");
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MODULE_LICENSE("GPL");
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