aboutsummaryrefslogtreecommitdiff
path: root/drivers/power/max8997_charger.c
blob: ffc5033ea9c92fcbad8957cad81674a376cb1909 (plain)
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
204
205
206
207
/*
 * max8997_charger.c - Power supply consumer driver for the Maxim 8997/8966
 *
 *  Copyright (C) 2011 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/slab.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/mfd/max8997.h>
#include <linux/mfd/max8997-private.h>

struct charger_data {
	struct device *dev;
	struct max8997_dev *iodev;
	struct power_supply battery;
};

static enum power_supply_property max8997_battery_props[] = {
	POWER_SUPPLY_PROP_STATUS, /* "FULL" or "NOT FULL" only. */
	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 max8997_battery_get_property(struct power_supply *psy,
		enum power_supply_property psp,
		union power_supply_propval *val)
{
	struct charger_data *charger = container_of(psy,
			struct charger_data, battery);
	struct i2c_client *i2c = charger->iodev->i2c;
	int ret;
	u8 reg;

	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
		val->intval = 0;
		ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
		if (ret)
			return ret;
		if ((reg & (1 << 0)) == 0x1)
			val->intval = POWER_SUPPLY_STATUS_FULL;

		break;
	case POWER_SUPPLY_PROP_PRESENT:
		val->intval = 0;
		ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
		if (ret)
			return ret;
		if ((reg & (1 << 2)) == 0x0)
			val->intval = 1;

		break;
	case POWER_SUPPLY_PROP_ONLINE:
		val->intval = 0;
		ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
		if (ret)
			return ret;
		/* DCINOK */
		if (reg & (1 << 1))
			val->intval = 1;

		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static __devinit int max8997_battery_probe(struct platform_device *pdev)
{
	int ret = 0;
	struct charger_data *charger;
	struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
	struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev);

	if (!pdata)
		return -EINVAL;

	if (pdata->eoc_mA) {
		u8 val = (pdata->eoc_mA - 50) / 10;
		if (val < 0)
			val = 0;
		if (val > 0xf)
			val = 0xf;

		ret = max8997_update_reg(iodev->i2c,
				MAX8997_REG_MBCCTRL5, val, 0xf);
		if (ret < 0) {
			dev_err(&pdev->dev, "Cannot use i2c bus.\n");
			return ret;
		}
	}

	switch (pdata->timeout) {
	case 5:
		ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
				0x2 << 4, 0x7 << 4);
		break;
	case 6:
		ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
				0x3 << 4, 0x7 << 4);
		break;
	case 7:
		ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
				0x4 << 4, 0x7 << 4);
		break;
	case 0:
		ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
				0x7 << 4, 0x7 << 4);
		break;
	default:
		dev_err(&pdev->dev, "incorrect timeout value (%d)\n",
				pdata->timeout);
		return -EINVAL;
	}
	if (ret < 0) {
		dev_err(&pdev->dev, "Cannot use i2c bus.\n");
		return ret;
	}

	charger = kzalloc(sizeof(struct charger_data), GFP_KERNEL);
	if (charger == NULL) {
		dev_err(&pdev->dev, "Cannot allocate memory.\n");
		return -ENOMEM;
	}

	platform_set_drvdata(pdev, charger);

	charger->battery.name = "max8997_pmic";
	charger->battery.type = POWER_SUPPLY_TYPE_BATTERY;
	charger->battery.get_property = max8997_battery_get_property;
	charger->battery.properties = max8997_battery_props;
	charger->battery.num_properties = ARRAY_SIZE(max8997_battery_props);

	charger->dev = &pdev->dev;
	charger->iodev = iodev;

	ret = power_supply_register(&pdev->dev, &charger->battery);
	if (ret) {
		dev_err(&pdev->dev, "failed: power supply register\n");
		goto err;
	}

	return 0;
err:
	kfree(charger);
	return ret;
}

static int __devexit max8997_battery_remove(struct platform_device *pdev)
{
	struct charger_data *charger = platform_get_drvdata(pdev);

	power_supply_unregister(&charger->battery);
	kfree(charger);
	return 0;
}

static const struct platform_device_id max8997_battery_id[] = {
	{ "max8997-battery", 0 },
};

static struct platform_driver max8997_battery_driver = {
	.driver = {
		.name = "max8997-battery",
		.owner = THIS_MODULE,
	},
	.probe = max8997_battery_probe,
	.remove = __devexit_p(max8997_battery_remove),
	.id_table = max8997_battery_id,
};

static int __init max8997_battery_init(void)
{
	return platform_driver_register(&max8997_battery_driver);
}
subsys_initcall(max8997_battery_init);

static void __exit max8997_battery_cleanup(void)
{
	platform_driver_unregister(&max8997_battery_driver);
}
module_exit(max8997_battery_cleanup);

MODULE_DESCRIPTION("MAXIM 8997/8966 battery control driver");
MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
MODULE_LICENSE("GPL");