1 // SPDX-License-Identifier: GPL-2.0+
3 // max8997_charger.c - Power supply consumer driver for the Maxim 8997/8966
5 // Copyright (C) 2011 Samsung Electronics
6 // MyungJoo Ham <myungjoo.ham@samsung.com>
9 #include <linux/module.h>
10 #include <linux/slab.h>
11 #include <linux/platform_device.h>
12 #include <linux/power_supply.h>
13 #include <linux/mfd/max8997.h>
14 #include <linux/mfd/max8997-private.h>
18 struct max8997_dev *iodev;
19 struct power_supply *battery;
22 static enum power_supply_property max8997_battery_props[] = {
23 POWER_SUPPLY_PROP_STATUS, /* "FULL" or "NOT FULL" only. */
24 POWER_SUPPLY_PROP_PRESENT, /* the presence of battery */
25 POWER_SUPPLY_PROP_ONLINE, /* charger is active or not */
28 /* Note that the charger control is done by a current regulator "CHARGER" */
29 static int max8997_battery_get_property(struct power_supply *psy,
30 enum power_supply_property psp,
31 union power_supply_propval *val)
33 struct charger_data *charger = power_supply_get_drvdata(psy);
34 struct i2c_client *i2c = charger->iodev->i2c;
39 case POWER_SUPPLY_PROP_STATUS:
41 ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®);
44 if ((reg & (1 << 0)) == 0x1)
45 val->intval = POWER_SUPPLY_STATUS_FULL;
48 case POWER_SUPPLY_PROP_PRESENT:
50 ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®);
53 if ((reg & (1 << 2)) == 0x0)
57 case POWER_SUPPLY_PROP_ONLINE:
59 ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®);
74 static const struct power_supply_desc max8997_battery_desc = {
75 .name = "max8997_pmic",
76 .type = POWER_SUPPLY_TYPE_BATTERY,
77 .get_property = max8997_battery_get_property,
78 .properties = max8997_battery_props,
79 .num_properties = ARRAY_SIZE(max8997_battery_props),
82 static int max8997_battery_probe(struct platform_device *pdev)
85 struct charger_data *charger;
86 struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
87 struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev);
88 struct power_supply_config psy_cfg = {};
94 int val = (pdata->eoc_mA - 50) / 10;
100 ret = max8997_update_reg(iodev->i2c,
101 MAX8997_REG_MBCCTRL5, val, 0xf);
103 dev_err(&pdev->dev, "Cannot use i2c bus.\n");
108 switch (pdata->timeout) {
110 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
114 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
118 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
122 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
126 dev_err(&pdev->dev, "incorrect timeout value (%d)\n",
131 dev_err(&pdev->dev, "Cannot use i2c bus.\n");
135 charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);
139 platform_set_drvdata(pdev, charger);
142 charger->dev = &pdev->dev;
143 charger->iodev = iodev;
145 psy_cfg.drv_data = charger;
147 charger->battery = devm_power_supply_register(&pdev->dev,
148 &max8997_battery_desc,
150 if (IS_ERR(charger->battery)) {
151 dev_err(&pdev->dev, "failed: power supply register\n");
152 return PTR_ERR(charger->battery);
158 static const struct platform_device_id max8997_battery_id[] = {
159 { "max8997-battery", 0 },
162 MODULE_DEVICE_TABLE(platform, max8997_battery_id);
164 static struct platform_driver max8997_battery_driver = {
166 .name = "max8997-battery",
168 .probe = max8997_battery_probe,
169 .id_table = max8997_battery_id,
172 static int __init max8997_battery_init(void)
174 return platform_driver_register(&max8997_battery_driver);
176 subsys_initcall(max8997_battery_init);
178 static void __exit max8997_battery_cleanup(void)
180 platform_driver_unregister(&max8997_battery_driver);
182 module_exit(max8997_battery_cleanup);
184 MODULE_DESCRIPTION("MAXIM 8997/8966 battery control driver");
185 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
186 MODULE_LICENSE("GPL");