1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
|
/*
* max8998_charger.c - Power supply consumer driver for the Maxim 8998/LP3974
*
* Copyright (C) 2009-2010 Samsung Electronics
* MyungJoo Ham <myungjoo.ham@samsung.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/err.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/mfd/max8998.h>
#include <linux/mfd/max8998-private.h>
struct max8998_battery_data {
struct device *dev;
struct max8998_dev *iodev;
struct power_supply *battery;
};
static enum power_supply_property max8998_battery_props[] = {
POWER_SUPPLY_PROP_PRESENT, /* the presence of battery */
POWER_SUPPLY_PROP_ONLINE, /* charger is active or not */
};
/* Note that the charger control is done by a current regulator "CHARGER" */
static int max8998_battery_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct max8998_battery_data *max8998 = power_supply_get_drvdata(psy);
struct i2c_client *i2c = max8998->iodev->i2c;
int ret;
u8 reg;
switch (psp) {
case POWER_SUPPLY_PROP_PRESENT:
ret = max8998_read_reg(i2c, MAX8998_REG_STATUS2, ®);
if (ret)
return ret;
if (reg & (1 << 4))
val->intval = 0;
else
val->intval = 1;
break;
case POWER_SUPPLY_PROP_ONLINE:
ret = max8998_read_reg(i2c, MAX8998_REG_STATUS2, ®);
if (ret)
return ret;
if (reg & (1 << 3))
val->intval = 0;
else
val->intval = 1;
break;
default:
return -EINVAL;
}
return 0;
}
static const struct power_supply_desc max8998_battery_desc = {
.name = "max8998_pmic",
.type = POWER_SUPPLY_TYPE_BATTERY,
.get_property = max8998_battery_get_property,
.properties = max8998_battery_props,
.num_properties = ARRAY_SIZE(max8998_battery_props),
};
static int max8998_battery_probe(struct platform_device *pdev)
{
struct max8998_dev *iodev = dev_get_drvdata(pdev->dev.parent);
struct max8998_platform_data *pdata = dev_get_platdata(iodev->dev);
struct power_supply_config psy_cfg = {};
struct max8998_battery_data *max8998;
struct i2c_client *i2c;
int ret = 0;
if (!pdata) {
dev_err(pdev->dev.parent, "No platform init data supplied\n");
return -ENODEV;
}
max8998 = devm_kzalloc(&pdev->dev, sizeof(struct max8998_battery_data),
GFP_KERNEL);
if (!max8998)
return -ENOMEM;
max8998->dev = &pdev->dev;
max8998->iodev = iodev;
platform_set_drvdata(pdev, max8998);
i2c = max8998->iodev->i2c;
/* Setup "End of Charge" */
/* If EOC value equals 0,
* remain value set from bootloader or default value */
if (pdata->eoc >= 10 && pdata->eoc <= 45) {
max8998_update_reg(i2c, MAX8998_REG_CHGR1,
(pdata->eoc / 5 - 2) << 5, 0x7 << 5);
} else if (pdata->eoc == 0) {
dev_dbg(max8998->dev,
"EOC value not set: leave it unchanged.\n");
} else {
dev_err(max8998->dev, "Invalid EOC value\n");
return -EINVAL;
}
/* Setup Charge Restart Level */
switch (pdata->restart) {
case 100:
max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x1 << 3, 0x3 << 3);
break;
case 150:
max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x0 << 3, 0x3 << 3);
break;
case 200:
max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x2 << 3, 0x3 << 3);
break;
case -1:
max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x3 << 3, 0x3 << 3);
break;
case 0:
dev_dbg(max8998->dev,
"Restart Level not set: leave it unchanged.\n");
break;
default:
dev_err(max8998->dev, "Invalid Restart Level\n");
return -EINVAL;
}
/* Setup Charge Full Timeout */
switch (pdata->timeout) {
case 5:
max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x0 << 4, 0x3 << 4);
break;
case 6:
max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x1 << 4, 0x3 << 4);
break;
case 7:
max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x2 << 4, 0x3 << 4);
break;
case -1:
max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x3 << 4, 0x3 << 4);
break;
case 0:
dev_dbg(max8998->dev,
"Full Timeout not set: leave it unchanged.\n");
break;
default:
dev_err(max8998->dev, "Invalid Full Timeout value\n");
return -EINVAL;
}
psy_cfg.drv_data = max8998;
max8998->battery = devm_power_supply_register(max8998->dev,
&max8998_battery_desc,
&psy_cfg);
if (IS_ERR(max8998->battery)) {
ret = PTR_ERR(max8998->battery);
dev_err(max8998->dev, "failed: power supply register: %d\n",
ret);
return ret;
}
return 0;
}
static const struct platform_device_id max8998_battery_id[] = {
{ "max8998-battery", TYPE_MAX8998 },
{ }
};
static struct platform_driver max8998_battery_driver = {
.driver = {
.name = "max8998-battery",
},
.probe = max8998_battery_probe,
.id_table = max8998_battery_id,
};
module_platform_driver(max8998_battery_driver);
MODULE_DESCRIPTION("MAXIM 8998 battery control driver");
MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:max8998-battery");
|
