1 // SPDX-License-Identifier: GPL-2.0+
2 //
3 // max8998_charger.c - Power supply consumer driver for the Maxim 8998/LP3974
4 //
5 //  Copyright (C) 2009-2010 Samsung Electronics
6 //  MyungJoo Ham <myungjoo.ham@samsung.com>
7 
8 #include <linux/err.h>
9 #include <linux/module.h>
10 #include <linux/mod_devicetable.h>
11 #include <linux/slab.h>
12 #include <linux/platform_device.h>
13 #include <linux/power_supply.h>
14 #include <linux/mfd/max8998.h>
15 #include <linux/mfd/max8998-private.h>
16 
17 struct max8998_battery_data {
18 	struct device *dev;
19 	struct max8998_dev *iodev;
20 	struct power_supply *battery;
21 };
22 
23 static enum power_supply_property max8998_battery_props[] = {
24 	POWER_SUPPLY_PROP_PRESENT, /* the presence of battery */
25 	POWER_SUPPLY_PROP_ONLINE, /* charger is active or not */
26 	POWER_SUPPLY_PROP_STATUS, /* charger is charging/discharging/full */
27 };
28 
29 /* Note that the charger control is done by a current regulator "CHARGER" */
max8998_battery_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)30 static int max8998_battery_get_property(struct power_supply *psy,
31 		enum power_supply_property psp,
32 		union power_supply_propval *val)
33 {
34 	struct max8998_battery_data *max8998 = power_supply_get_drvdata(psy);
35 	struct i2c_client *i2c = max8998->iodev->i2c;
36 	int ret;
37 	u8 reg;
38 
39 	switch (psp) {
40 	case POWER_SUPPLY_PROP_PRESENT:
41 		ret = max8998_read_reg(i2c, MAX8998_REG_STATUS2, &reg);
42 		if (ret)
43 			return ret;
44 		if (reg & (1 << 4))
45 			val->intval = 0;
46 		else
47 			val->intval = 1;
48 		break;
49 	case POWER_SUPPLY_PROP_ONLINE:
50 		ret = max8998_read_reg(i2c, MAX8998_REG_STATUS2, &reg);
51 		if (ret)
52 			return ret;
53 
54 		if (reg & (1 << 5))
55 			val->intval = 1;
56 		else
57 			val->intval = 0;
58 
59 		break;
60 	case POWER_SUPPLY_PROP_STATUS:
61 		ret = max8998_read_reg(i2c, MAX8998_REG_STATUS2, &reg);
62 		if (ret)
63 			return ret;
64 
65 		if (!(reg & (1 << 5))) {
66 			val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
67 		} else {
68 			if (reg & (1 << 6))
69 				val->intval = POWER_SUPPLY_STATUS_FULL;
70 			else if (reg & (1 << 3))
71 				val->intval = POWER_SUPPLY_STATUS_CHARGING;
72 			else
73 				val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
74 		}
75 		break;
76 	default:
77 		return -EINVAL;
78 	}
79 
80 	return 0;
81 }
82 
83 static const struct power_supply_desc max8998_battery_desc = {
84 	.name		= "max8998_pmic",
85 	.type		= POWER_SUPPLY_TYPE_BATTERY,
86 	.get_property	= max8998_battery_get_property,
87 	.properties	= max8998_battery_props,
88 	.num_properties	= ARRAY_SIZE(max8998_battery_props),
89 };
90 
max8998_battery_probe(struct platform_device * pdev)91 static int max8998_battery_probe(struct platform_device *pdev)
92 {
93 	struct max8998_dev *iodev = dev_get_drvdata(pdev->dev.parent);
94 	struct max8998_platform_data *pdata = iodev->pdata;
95 	struct power_supply_config psy_cfg = {};
96 	struct max8998_battery_data *max8998;
97 	struct i2c_client *i2c;
98 	int ret = 0;
99 
100 	if (!pdata) {
101 		dev_err(pdev->dev.parent, "No platform init data supplied\n");
102 		return -ENODEV;
103 	}
104 
105 	max8998 = devm_kzalloc(&pdev->dev, sizeof(struct max8998_battery_data),
106 				GFP_KERNEL);
107 	if (!max8998)
108 		return -ENOMEM;
109 
110 	max8998->dev = &pdev->dev;
111 	max8998->iodev = iodev;
112 	platform_set_drvdata(pdev, max8998);
113 	i2c = max8998->iodev->i2c;
114 
115 	/* Setup "End of Charge" */
116 	/* If EOC value equals 0,
117 	 * remain value set from bootloader or default value */
118 	if (pdata->eoc >= 10 && pdata->eoc <= 45) {
119 		max8998_update_reg(i2c, MAX8998_REG_CHGR1,
120 				(pdata->eoc / 5 - 2) << 5, 0x7 << 5);
121 	} else if (pdata->eoc == 0) {
122 		dev_dbg(max8998->dev,
123 			"EOC value not set: leave it unchanged.\n");
124 	} else {
125 		dev_err(max8998->dev, "Invalid EOC value\n");
126 		return -EINVAL;
127 	}
128 
129 	/* Setup Charge Restart Level */
130 	switch (pdata->restart) {
131 	case 100:
132 		max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x1 << 3, 0x3 << 3);
133 		break;
134 	case 150:
135 		max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x0 << 3, 0x3 << 3);
136 		break;
137 	case 200:
138 		max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x2 << 3, 0x3 << 3);
139 		break;
140 	case -1:
141 		max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x3 << 3, 0x3 << 3);
142 		break;
143 	case 0:
144 		dev_dbg(max8998->dev,
145 			"Restart Level not set: leave it unchanged.\n");
146 		break;
147 	default:
148 		dev_err(max8998->dev, "Invalid Restart Level\n");
149 		return -EINVAL;
150 	}
151 
152 	/* Setup Charge Full Timeout */
153 	switch (pdata->timeout) {
154 	case 5:
155 		max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x0 << 4, 0x3 << 4);
156 		break;
157 	case 6:
158 		max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x1 << 4, 0x3 << 4);
159 		break;
160 	case 7:
161 		max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x2 << 4, 0x3 << 4);
162 		break;
163 	case -1:
164 		max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x3 << 4, 0x3 << 4);
165 		break;
166 	case 0:
167 		dev_dbg(max8998->dev,
168 			"Full Timeout not set: leave it unchanged.\n");
169 		break;
170 	default:
171 		dev_err(max8998->dev, "Invalid Full Timeout value\n");
172 		return -EINVAL;
173 	}
174 
175 	psy_cfg.drv_data = max8998;
176 
177 	max8998->battery = devm_power_supply_register(max8998->dev,
178 						      &max8998_battery_desc,
179 						      &psy_cfg);
180 	if (IS_ERR(max8998->battery)) {
181 		ret = PTR_ERR(max8998->battery);
182 		dev_err(max8998->dev, "failed: power supply register: %d\n",
183 			ret);
184 		return ret;
185 	}
186 
187 	return 0;
188 }
189 
190 static const struct platform_device_id max8998_battery_id[] = {
191 	{ "max8998-battery", TYPE_MAX8998 },
192 	{ }
193 };
194 
195 static struct platform_driver max8998_battery_driver = {
196 	.driver = {
197 		.name = "max8998-battery",
198 	},
199 	.probe = max8998_battery_probe,
200 	.id_table = max8998_battery_id,
201 };
202 
203 module_platform_driver(max8998_battery_driver);
204 
205 MODULE_DESCRIPTION("MAXIM 8998 battery control driver");
206 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
207 MODULE_LICENSE("GPL");
208 MODULE_ALIAS("platform:max8998-battery");
209