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 };
27
28 /* 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)29 static int max8998_battery_get_property(struct power_supply *psy,
30 enum power_supply_property psp,
31 union power_supply_propval *val)
32 {
33 struct max8998_battery_data *max8998 = power_supply_get_drvdata(psy);
34 struct i2c_client *i2c = max8998->iodev->i2c;
35 int ret;
36 u8 reg;
37
38 switch (psp) {
39 case POWER_SUPPLY_PROP_PRESENT:
40 ret = max8998_read_reg(i2c, MAX8998_REG_STATUS2, ®);
41 if (ret)
42 return ret;
43 if (reg & (1 << 4))
44 val->intval = 0;
45 else
46 val->intval = 1;
47 break;
48 case POWER_SUPPLY_PROP_ONLINE:
49 ret = max8998_read_reg(i2c, MAX8998_REG_STATUS2, ®);
50 if (ret)
51 return ret;
52 if (reg & (1 << 3))
53 val->intval = 0;
54 else
55 val->intval = 1;
56 break;
57 default:
58 return -EINVAL;
59 }
60
61 return 0;
62 }
63
64 static const struct power_supply_desc max8998_battery_desc = {
65 .name = "max8998_pmic",
66 .type = POWER_SUPPLY_TYPE_BATTERY,
67 .get_property = max8998_battery_get_property,
68 .properties = max8998_battery_props,
69 .num_properties = ARRAY_SIZE(max8998_battery_props),
70 };
71
max8998_battery_probe(struct platform_device * pdev)72 static int max8998_battery_probe(struct platform_device *pdev)
73 {
74 struct max8998_dev *iodev = dev_get_drvdata(pdev->dev.parent);
75 struct max8998_platform_data *pdata = iodev->pdata;
76 struct power_supply_config psy_cfg = {};
77 struct max8998_battery_data *max8998;
78 struct i2c_client *i2c;
79 int ret = 0;
80
81 if (!pdata) {
82 dev_err(pdev->dev.parent, "No platform init data supplied\n");
83 return -ENODEV;
84 }
85
86 max8998 = devm_kzalloc(&pdev->dev, sizeof(struct max8998_battery_data),
87 GFP_KERNEL);
88 if (!max8998)
89 return -ENOMEM;
90
91 max8998->dev = &pdev->dev;
92 max8998->iodev = iodev;
93 platform_set_drvdata(pdev, max8998);
94 i2c = max8998->iodev->i2c;
95
96 /* Setup "End of Charge" */
97 /* If EOC value equals 0,
98 * remain value set from bootloader or default value */
99 if (pdata->eoc >= 10 && pdata->eoc <= 45) {
100 max8998_update_reg(i2c, MAX8998_REG_CHGR1,
101 (pdata->eoc / 5 - 2) << 5, 0x7 << 5);
102 } else if (pdata->eoc == 0) {
103 dev_dbg(max8998->dev,
104 "EOC value not set: leave it unchanged.\n");
105 } else {
106 dev_err(max8998->dev, "Invalid EOC value\n");
107 return -EINVAL;
108 }
109
110 /* Setup Charge Restart Level */
111 switch (pdata->restart) {
112 case 100:
113 max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x1 << 3, 0x3 << 3);
114 break;
115 case 150:
116 max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x0 << 3, 0x3 << 3);
117 break;
118 case 200:
119 max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x2 << 3, 0x3 << 3);
120 break;
121 case -1:
122 max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x3 << 3, 0x3 << 3);
123 break;
124 case 0:
125 dev_dbg(max8998->dev,
126 "Restart Level not set: leave it unchanged.\n");
127 break;
128 default:
129 dev_err(max8998->dev, "Invalid Restart Level\n");
130 return -EINVAL;
131 }
132
133 /* Setup Charge Full Timeout */
134 switch (pdata->timeout) {
135 case 5:
136 max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x0 << 4, 0x3 << 4);
137 break;
138 case 6:
139 max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x1 << 4, 0x3 << 4);
140 break;
141 case 7:
142 max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x2 << 4, 0x3 << 4);
143 break;
144 case -1:
145 max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x3 << 4, 0x3 << 4);
146 break;
147 case 0:
148 dev_dbg(max8998->dev,
149 "Full Timeout not set: leave it unchanged.\n");
150 break;
151 default:
152 dev_err(max8998->dev, "Invalid Full Timeout value\n");
153 return -EINVAL;
154 }
155
156 psy_cfg.drv_data = max8998;
157
158 max8998->battery = devm_power_supply_register(max8998->dev,
159 &max8998_battery_desc,
160 &psy_cfg);
161 if (IS_ERR(max8998->battery)) {
162 ret = PTR_ERR(max8998->battery);
163 dev_err(max8998->dev, "failed: power supply register: %d\n",
164 ret);
165 return ret;
166 }
167
168 return 0;
169 }
170
171 static const struct platform_device_id max8998_battery_id[] = {
172 { "max8998-battery", TYPE_MAX8998 },
173 { }
174 };
175
176 static struct platform_driver max8998_battery_driver = {
177 .driver = {
178 .name = "max8998-battery",
179 },
180 .probe = max8998_battery_probe,
181 .id_table = max8998_battery_id,
182 };
183
184 module_platform_driver(max8998_battery_driver);
185
186 MODULE_DESCRIPTION("MAXIM 8998 battery control driver");
187 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
188 MODULE_LICENSE("GPL");
189 MODULE_ALIAS("platform:max8998-battery");
190
