1// SPDX-License-Identifier: GPL-2.0+
2//
3// max8997_charger.c - Power supply consumer driver for the Maxim 8997/8966
4//
5//  Copyright (C) 2011 Samsung Electronics
6//  MyungJoo Ham <myungjoo.ham@samsung.com>
7
8#include <linux/err.h>
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>
15
16struct charger_data {
17	struct device *dev;
18	struct max8997_dev *iodev;
19	struct power_supply *battery;
20};
21
22static 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 */
26};
27
28/* Note that the charger control is done by a current regulator "CHARGER" */
29static int max8997_battery_get_property(struct power_supply *psy,
30		enum power_supply_property psp,
31		union power_supply_propval *val)
32{
33	struct charger_data *charger = power_supply_get_drvdata(psy);
34	struct i2c_client *i2c = charger->iodev->i2c;
35	int ret;
36	u8 reg;
37
38	switch (psp) {
39	case POWER_SUPPLY_PROP_STATUS:
40		val->intval = 0;
41		ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
42		if (ret)
43			return ret;
44		if ((reg & (1 << 0)) == 0x1)
45			val->intval = POWER_SUPPLY_STATUS_FULL;
46
47		break;
48	case POWER_SUPPLY_PROP_PRESENT:
49		val->intval = 0;
50		ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
51		if (ret)
52			return ret;
53		if ((reg & (1 << 2)) == 0x0)
54			val->intval = 1;
55
56		break;
57	case POWER_SUPPLY_PROP_ONLINE:
58		val->intval = 0;
59		ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
60		if (ret)
61			return ret;
62		/* DCINOK */
63		if (reg & (1 << 1))
64			val->intval = 1;
65
66		break;
67	default:
68		return -EINVAL;
69	}
70
71	return 0;
72}
73
74static 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),
80};
81
82static int max8997_battery_probe(struct platform_device *pdev)
83{
84	int ret = 0;
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 = {};
89
90	if (!pdata)
91		return -EINVAL;
92
93	if (pdata->eoc_mA) {
94		int val = (pdata->eoc_mA - 50) / 10;
95		if (val < 0)
96			val = 0;
97		if (val > 0xf)
98			val = 0xf;
99
100		ret = max8997_update_reg(iodev->i2c,
101				MAX8997_REG_MBCCTRL5, val, 0xf);
102		if (ret < 0) {
103			dev_err(&pdev->dev, "Cannot use i2c bus.\n");
104			return ret;
105		}
106	}
107
108	switch (pdata->timeout) {
109	case 5:
110		ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
111				0x2 << 4, 0x7 << 4);
112		break;
113	case 6:
114		ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
115				0x3 << 4, 0x7 << 4);
116		break;
117	case 7:
118		ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
119				0x4 << 4, 0x7 << 4);
120		break;
121	case 0:
122		ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
123				0x7 << 4, 0x7 << 4);
124		break;
125	default:
126		dev_err(&pdev->dev, "incorrect timeout value (%d)\n",
127				pdata->timeout);
128		return -EINVAL;
129	}
130	if (ret < 0) {
131		dev_err(&pdev->dev, "Cannot use i2c bus.\n");
132		return ret;
133	}
134
135	charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);
136	if (!charger)
137		return -ENOMEM;
138
139	platform_set_drvdata(pdev, charger);
140
141
142	charger->dev = &pdev->dev;
143	charger->iodev = iodev;
144
145	psy_cfg.drv_data = charger;
146
147	charger->battery = devm_power_supply_register(&pdev->dev,
148						 &max8997_battery_desc,
149						 &psy_cfg);
150	if (IS_ERR(charger->battery)) {
151		dev_err(&pdev->dev, "failed: power supply register\n");
152		return PTR_ERR(charger->battery);
153	}
154
155	return 0;
156}
157
158static const struct platform_device_id max8997_battery_id[] = {
159	{ "max8997-battery", 0 },
160	{ }
161};
162MODULE_DEVICE_TABLE(platform, max8997_battery_id);
163
164static struct platform_driver max8997_battery_driver = {
165	.driver = {
166		.name = "max8997-battery",
167	},
168	.probe = max8997_battery_probe,
169	.id_table = max8997_battery_id,
170};
171
172static int __init max8997_battery_init(void)
173{
174	return platform_driver_register(&max8997_battery_driver);
175}
176subsys_initcall(max8997_battery_init);
177
178static void __exit max8997_battery_cleanup(void)
179{
180	platform_driver_unregister(&max8997_battery_driver);
181}
182module_exit(max8997_battery_cleanup);
183
184MODULE_DESCRIPTION("MAXIM 8997/8966 battery control driver");
185MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
186MODULE_LICENSE("GPL");
187