1 /*
2 * max8998_charger.c - Power supply consumer driver for the Maxim 8998/LP3974
3 *
4 * Copyright (C) 2009-2010 Samsung Electronics
5 * MyungJoo Ham <myungjoo.ham@samsung.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21
22 #include <linux/module.h>
23 #include <linux/err.h>
24 #include <linux/module.h>
25 #include <linux/slab.h>
26 #include <linux/platform_device.h>
27 #include <linux/power_supply.h>
28 #include <linux/mfd/max8998.h>
29 #include <linux/mfd/max8998-private.h>
30
31 struct max8998_battery_data {
32 struct device *dev;
33 struct max8998_dev *iodev;
34 struct power_supply battery;
35 };
36
37 static enum power_supply_property max8998_battery_props[] = {
38 POWER_SUPPLY_PROP_PRESENT, /* the presence of battery */
39 POWER_SUPPLY_PROP_ONLINE, /* charger is active or not */
40 };
41
42 /* 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)43 static int max8998_battery_get_property(struct power_supply *psy,
44 enum power_supply_property psp,
45 union power_supply_propval *val)
46 {
47 struct max8998_battery_data *max8998 = container_of(psy,
48 struct max8998_battery_data, battery);
49 struct i2c_client *i2c = max8998->iodev->i2c;
50 int ret;
51 u8 reg;
52
53 switch (psp) {
54 case POWER_SUPPLY_PROP_PRESENT:
55 ret = max8998_read_reg(i2c, MAX8998_REG_STATUS2, ®);
56 if (ret)
57 return ret;
58 if (reg & (1 << 4))
59 val->intval = 0;
60 else
61 val->intval = 1;
62 break;
63 case POWER_SUPPLY_PROP_ONLINE:
64 ret = max8998_read_reg(i2c, MAX8998_REG_STATUS2, ®);
65 if (ret)
66 return ret;
67 if (reg & (1 << 3))
68 val->intval = 0;
69 else
70 val->intval = 1;
71 break;
72 default:
73 return -EINVAL;
74 }
75
76 return 0;
77 }
78
max8998_battery_probe(struct platform_device * pdev)79 static __devinit int max8998_battery_probe(struct platform_device *pdev)
80 {
81 struct max8998_dev *iodev = dev_get_drvdata(pdev->dev.parent);
82 struct max8998_platform_data *pdata = dev_get_platdata(iodev->dev);
83 struct max8998_battery_data *max8998;
84 struct i2c_client *i2c;
85 int ret = 0;
86
87 if (!pdata) {
88 dev_err(pdev->dev.parent, "No platform init data supplied\n");
89 return -ENODEV;
90 }
91
92 max8998 = kzalloc(sizeof(struct max8998_battery_data), GFP_KERNEL);
93 if (!max8998)
94 return -ENOMEM;
95
96 max8998->dev = &pdev->dev;
97 max8998->iodev = iodev;
98 platform_set_drvdata(pdev, max8998);
99 i2c = max8998->iodev->i2c;
100
101 /* Setup "End of Charge" */
102 /* If EOC value equals 0,
103 * remain value set from bootloader or default value */
104 if (pdata->eoc >= 10 && pdata->eoc <= 45) {
105 max8998_update_reg(i2c, MAX8998_REG_CHGR1,
106 (pdata->eoc / 5 - 2) << 5, 0x7 << 5);
107 } else if (pdata->eoc == 0) {
108 dev_dbg(max8998->dev,
109 "EOC value not set: leave it unchanged.\n");
110 } else {
111 dev_err(max8998->dev, "Invalid EOC value\n");
112 ret = -EINVAL;
113 goto err;
114 }
115
116 /* Setup Charge Restart Level */
117 switch (pdata->restart) {
118 case 100:
119 max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x1 << 3, 0x3 << 3);
120 break;
121 case 150:
122 max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x0 << 3, 0x3 << 3);
123 break;
124 case 200:
125 max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x2 << 3, 0x3 << 3);
126 break;
127 case -1:
128 max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x3 << 3, 0x3 << 3);
129 break;
130 case 0:
131 dev_dbg(max8998->dev,
132 "Restart Level not set: leave it unchanged.\n");
133 break;
134 default:
135 dev_err(max8998->dev, "Invalid Restart Level\n");
136 ret = -EINVAL;
137 goto err;
138 }
139
140 /* Setup Charge Full Timeout */
141 switch (pdata->timeout) {
142 case 5:
143 max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x0 << 4, 0x3 << 4);
144 break;
145 case 6:
146 max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x1 << 4, 0x3 << 4);
147 break;
148 case 7:
149 max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x2 << 4, 0x3 << 4);
150 break;
151 case -1:
152 max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x3 << 4, 0x3 << 4);
153 break;
154 case 0:
155 dev_dbg(max8998->dev,
156 "Full Timeout not set: leave it unchanged.\n");
157 break;
158 default:
159 dev_err(max8998->dev, "Invalid Full Timeout value\n");
160 ret = -EINVAL;
161 goto err;
162 }
163
164 max8998->battery.name = "max8998_pmic";
165 max8998->battery.type = POWER_SUPPLY_TYPE_BATTERY;
166 max8998->battery.get_property = max8998_battery_get_property;
167 max8998->battery.properties = max8998_battery_props;
168 max8998->battery.num_properties = ARRAY_SIZE(max8998_battery_props);
169
170 ret = power_supply_register(max8998->dev, &max8998->battery);
171 if (ret) {
172 dev_err(max8998->dev, "failed: power supply register\n");
173 goto err;
174 }
175
176 return 0;
177 err:
178 kfree(max8998);
179 return ret;
180 }
181
max8998_battery_remove(struct platform_device * pdev)182 static int __devexit max8998_battery_remove(struct platform_device *pdev)
183 {
184 struct max8998_battery_data *max8998 = platform_get_drvdata(pdev);
185
186 power_supply_unregister(&max8998->battery);
187 kfree(max8998);
188
189 return 0;
190 }
191
192 static const struct platform_device_id max8998_battery_id[] = {
193 { "max8998-battery", TYPE_MAX8998 },
194 { }
195 };
196
197 static struct platform_driver max8998_battery_driver = {
198 .driver = {
199 .name = "max8998-battery",
200 .owner = THIS_MODULE,
201 },
202 .probe = max8998_battery_probe,
203 .remove = __devexit_p(max8998_battery_remove),
204 .id_table = max8998_battery_id,
205 };
206
207 module_platform_driver(max8998_battery_driver);
208
209 MODULE_DESCRIPTION("MAXIM 8998 battery control driver");
210 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
211 MODULE_LICENSE("GPL");
212 MODULE_ALIAS("platform:max8998-battery");
213