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/err.h>
23 #include <linux/module.h>
24 #include <linux/slab.h>
25 #include <linux/platform_device.h>
26 #include <linux/power_supply.h>
27 #include <linux/mfd/max8998.h>
28 #include <linux/mfd/max8998-private.h>
29
30 struct max8998_battery_data {
31 struct device *dev;
32 struct max8998_dev *iodev;
33 struct power_supply battery;
34 };
35
36 static enum power_supply_property max8998_battery_props[] = {
37 POWER_SUPPLY_PROP_PRESENT, /* the presence of battery */
38 POWER_SUPPLY_PROP_ONLINE, /* charger is active or not */
39 };
40
41 /* 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)42 static int max8998_battery_get_property(struct power_supply *psy,
43 enum power_supply_property psp,
44 union power_supply_propval *val)
45 {
46 struct max8998_battery_data *max8998 = container_of(psy,
47 struct max8998_battery_data, battery);
48 struct i2c_client *i2c = max8998->iodev->i2c;
49 int ret;
50 u8 reg;
51
52 switch (psp) {
53 case POWER_SUPPLY_PROP_PRESENT:
54 ret = max8998_read_reg(i2c, MAX8998_REG_STATUS2, ®);
55 if (ret)
56 return ret;
57 if (reg & (1 << 4))
58 val->intval = 0;
59 else
60 val->intval = 1;
61 break;
62 case POWER_SUPPLY_PROP_ONLINE:
63 ret = max8998_read_reg(i2c, MAX8998_REG_STATUS2, ®);
64 if (ret)
65 return ret;
66 if (reg & (1 << 3))
67 val->intval = 0;
68 else
69 val->intval = 1;
70 break;
71 default:
72 return -EINVAL;
73 }
74
75 return 0;
76 }
77
max8998_battery_probe(struct platform_device * pdev)78 static int max8998_battery_probe(struct platform_device *pdev)
79 {
80 struct max8998_dev *iodev = dev_get_drvdata(pdev->dev.parent);
81 struct max8998_platform_data *pdata = dev_get_platdata(iodev->dev);
82 struct max8998_battery_data *max8998;
83 struct i2c_client *i2c;
84 int ret = 0;
85
86 if (!pdata) {
87 dev_err(pdev->dev.parent, "No platform init data supplied\n");
88 return -ENODEV;
89 }
90
91 max8998 = devm_kzalloc(&pdev->dev, sizeof(struct max8998_battery_data),
92 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 return ret;
179 }
180
max8998_battery_remove(struct platform_device * pdev)181 static int max8998_battery_remove(struct platform_device *pdev)
182 {
183 struct max8998_battery_data *max8998 = platform_get_drvdata(pdev);
184
185 power_supply_unregister(&max8998->battery);
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 .owner = THIS_MODULE,
199 },
200 .probe = max8998_battery_probe,
201 .remove = max8998_battery_remove,
202 .id_table = max8998_battery_id,
203 };
204
205 module_platform_driver(max8998_battery_driver);
206
207 MODULE_DESCRIPTION("MAXIM 8998 battery control driver");
208 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
209 MODULE_LICENSE("GPL");
210 MODULE_ALIAS("platform:max8998-battery");
211