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, ®);
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, ®);
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, ®);
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