tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * max8997_charger.c - Power supply consumer driver for the Maxim 8997/8966
3 *
4 * Copyright (C) 2011 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/slab.h>
24#include <linux/platform_device.h>
25#include <linux/power_supply.h>
26#include <linux/mfd/max8997.h>
27#include <linux/mfd/max8997-private.h>
28
29struct charger_data {
30 struct device *dev;
31 struct max8997_dev *iodev;
32 struct power_supply battery;
33};
34
35static enum power_supply_property max8997_battery_props[] = {
36 POWER_SUPPLY_PROP_STATUS, /* "FULL" or "NOT FULL" only. */
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" */
42static int max8997_battery_get_property(struct power_supply *psy,
43 enum power_supply_property psp,
44 union power_supply_propval *val)
45{
46 struct charger_data *charger = container_of(psy,
47 struct charger_data, battery);
48 struct i2c_client *i2c = charger->iodev->i2c;
49 int ret;
50 u8 reg;
51
52 switch (psp) {
53 case POWER_SUPPLY_PROP_STATUS:
54 val->intval = 0;
55 ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®);
56 if (ret)
57 return ret;
58 if ((reg & (1 << 0)) == 0x1)
59 val->intval = POWER_SUPPLY_STATUS_FULL;
60
61 break;
62 case POWER_SUPPLY_PROP_PRESENT:
63 val->intval = 0;
64 ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®);
65 if (ret)
66 return ret;
67 if ((reg & (1 << 2)) == 0x0)
68 val->intval = 1;
69
70 break;
71 case POWER_SUPPLY_PROP_ONLINE:
72 val->intval = 0;
73 ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®);
74 if (ret)
75 return ret;
76 /* DCINOK */
77 if (reg & (1 << 1))
78 val->intval = 1;
79
80 break;
81 default:
82 return -EINVAL;
83 }
84
85 return 0;
86}
87
88static __devinit int max8997_battery_probe(struct platform_device *pdev)
89{
90 int ret = 0;
91 struct charger_data *charger;
92 struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
93 struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev);
94
95 if (!pdata)
96 return -EINVAL;
97
98 if (pdata->eoc_mA) {
99 u8 val = (pdata->eoc_mA - 50) / 10;
100 if (val < 0)
101 val = 0;
102 if (val > 0xf)
103 val = 0xf;
104
105 ret = max8997_update_reg(iodev->i2c,
106 MAX8997_REG_MBCCTRL5, val, 0xf);
107 if (ret < 0) {
108 dev_err(&pdev->dev, "Cannot use i2c bus.\n");
109 return ret;
110 }
111 }
112
113 switch (pdata->timeout) {
114 case 5:
115 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
116 0x2 << 4, 0x7 << 4);
117 break;
118 case 6:
119 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
120 0x3 << 4, 0x7 << 4);
121 break;
122 case 7:
123 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
124 0x4 << 4, 0x7 << 4);
125 break;
126 case 0:
127 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
128 0x7 << 4, 0x7 << 4);
129 break;
130 default:
131 dev_err(&pdev->dev, "incorrect timeout value (%d)\n",
132 pdata->timeout);
133 return -EINVAL;
134 }
135 if (ret < 0) {
136 dev_err(&pdev->dev, "Cannot use i2c bus.\n");
137 return ret;
138 }
139
140 charger = kzalloc(sizeof(struct charger_data), GFP_KERNEL);
141 if (charger == NULL) {
142 dev_err(&pdev->dev, "Cannot allocate memory.\n");
143 return -ENOMEM;
144 }
145
146 platform_set_drvdata(pdev, charger);
147
148 charger->battery.name = "max8997_pmic";
149 charger->battery.type = POWER_SUPPLY_TYPE_BATTERY;
150 charger->battery.get_property = max8997_battery_get_property;
151 charger->battery.properties = max8997_battery_props;
152 charger->battery.num_properties = ARRAY_SIZE(max8997_battery_props);
153
154 charger->dev = &pdev->dev;
155 charger->iodev = iodev;
156
157 ret = power_supply_register(&pdev->dev, &charger->battery);
158 if (ret) {
159 dev_err(&pdev->dev, "failed: power supply register\n");
160 goto err;
161 }
162
163 return 0;
164err:
165 kfree(charger);
166 return ret;
167}
168
169static int __devexit max8997_battery_remove(struct platform_device *pdev)
170{
171 struct charger_data *charger = platform_get_drvdata(pdev);
172
173 power_supply_unregister(&charger->battery);
174 kfree(charger);
175 return 0;
176}
177
178static const struct platform_device_id max8997_battery_id[] = {
179 { "max8997-battery", 0 },
180};
181
182static struct platform_driver max8997_battery_driver = {
183 .driver = {
184 .name = "max8997-battery",
185 .owner = THIS_MODULE,
186 },
187 .probe = max8997_battery_probe,
188 .remove = __devexit_p(max8997_battery_remove),
189 .id_table = max8997_battery_id,
190};
191
192static int __init max8997_battery_init(void)
193{
194 return platform_driver_register(&max8997_battery_driver);
195}
196subsys_initcall(max8997_battery_init);
197
198static void __exit max8997_battery_cleanup(void)
199{
200 platform_driver_unregister(&max8997_battery_driver);
201}
202module_exit(max8997_battery_cleanup);
203
204MODULE_DESCRIPTION("MAXIM 8997/8966 battery control driver");
205MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
206MODULE_LICENSE("GPL");