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>
16 /* MAX8997_REG_STATUS4 */
17 #define DCINOK_SHIFT 1
18 #define DCINOK_MASK (1 << DCINOK_SHIFT)
19 #define DETBAT_SHIFT 2
20 #define DETBAT_MASK (1 << DETBAT_SHIFT)
22 /* MAX8997_REG_MBCCTRL1 */
24 #define TFCH_MASK (7 << TFCH_SHIFT)
26 /* MAX8997_REG_MBCCTRL5 */
27 #define ITOPOFF_SHIFT 0
28 #define ITOPOFF_MASK (0xF << ITOPOFF_SHIFT)
32 struct max8997_dev *iodev;
33 struct power_supply *battery;
36 static enum power_supply_property max8997_battery_props[] = {
37 POWER_SUPPLY_PROP_STATUS, /* "FULL", "CHARGING" or "DISCHARGING". */
38 POWER_SUPPLY_PROP_PRESENT, /* the presence of battery */
39 POWER_SUPPLY_PROP_ONLINE, /* charger is active or not */
42 /* Note that the charger control is done by a current regulator "CHARGER" */
43 static int max8997_battery_get_property(struct power_supply *psy,
44 enum power_supply_property psp,
45 union power_supply_propval *val)
47 struct charger_data *charger = power_supply_get_drvdata(psy);
48 struct i2c_client *i2c = charger->iodev->i2c;
53 case POWER_SUPPLY_PROP_STATUS:
55 ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®);
58 if ((reg & (1 << 0)) == 0x1)
59 val->intval = POWER_SUPPLY_STATUS_FULL;
60 else if ((reg & DCINOK_MASK))
61 val->intval = POWER_SUPPLY_STATUS_CHARGING;
63 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
66 case POWER_SUPPLY_PROP_PRESENT:
68 ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®);
71 if ((reg & DETBAT_MASK) == 0x0)
75 case POWER_SUPPLY_PROP_ONLINE:
77 ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®);
80 if (reg & DCINOK_MASK)
91 static const struct power_supply_desc max8997_battery_desc = {
92 .name = "max8997_pmic",
93 .type = POWER_SUPPLY_TYPE_BATTERY,
94 .get_property = max8997_battery_get_property,
95 .properties = max8997_battery_props,
96 .num_properties = ARRAY_SIZE(max8997_battery_props),
99 static int max8997_battery_probe(struct platform_device *pdev)
102 struct charger_data *charger;
103 struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
104 struct i2c_client *i2c = iodev->i2c;
105 struct max8997_platform_data *pdata = iodev->pdata;
106 struct power_supply_config psy_cfg = {};
109 dev_err(&pdev->dev, "No platform data supplied.\n");
114 int val = (pdata->eoc_mA - 50) / 10;
120 ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL5,
121 val << ITOPOFF_SHIFT, ITOPOFF_MASK);
123 dev_err(&pdev->dev, "Cannot use i2c bus.\n");
127 switch (pdata->timeout) {
129 ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL1,
130 0x2 << TFCH_SHIFT, TFCH_MASK);
133 ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL1,
134 0x3 << TFCH_SHIFT, TFCH_MASK);
137 ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL1,
138 0x4 << TFCH_SHIFT, TFCH_MASK);
141 ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL1,
142 0x7 << TFCH_SHIFT, TFCH_MASK);
145 dev_err(&pdev->dev, "incorrect timeout value (%d)\n",
150 dev_err(&pdev->dev, "Cannot use i2c bus.\n");
154 charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);
158 platform_set_drvdata(pdev, charger);
160 charger->dev = &pdev->dev;
161 charger->iodev = iodev;
163 psy_cfg.drv_data = charger;
165 charger->battery = devm_power_supply_register(&pdev->dev,
166 &max8997_battery_desc,
168 if (IS_ERR(charger->battery)) {
169 dev_err(&pdev->dev, "failed: power supply register\n");
170 return PTR_ERR(charger->battery);
176 static const struct platform_device_id max8997_battery_id[] = {
177 { "max8997-battery", 0 },
180 MODULE_DEVICE_TABLE(platform, max8997_battery_id);
182 static struct platform_driver max8997_battery_driver = {
184 .name = "max8997-battery",
186 .probe = max8997_battery_probe,
187 .id_table = max8997_battery_id,
189 module_platform_driver(max8997_battery_driver);
191 MODULE_DESCRIPTION("MAXIM 8997/8966 battery control driver");
192 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
193 MODULE_LICENSE("GPL");