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Donggeun Kim149c0772011-06-22 19:40:06 +09001/*
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>
Axel Lin71aa79a2011-08-01 07:29:31 +080023#include <linux/module.h>
Donggeun Kim149c0772011-06-22 19:40:06 +090024#include <linux/slab.h>
25#include <linux/platform_device.h>
26#include <linux/power_supply.h>
27#include <linux/mfd/max8997.h>
28#include <linux/mfd/max8997-private.h>
29
30struct charger_data {
31 struct device *dev;
32 struct max8997_dev *iodev;
Krzysztof Kozlowski297d7162015-03-12 08:44:11 +010033 struct power_supply *battery;
Donggeun Kim149c0772011-06-22 19:40:06 +090034};
35
36static enum power_supply_property max8997_battery_props[] = {
37 POWER_SUPPLY_PROP_STATUS, /* "FULL" or "NOT FULL" only. */
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" */
43static int max8997_battery_get_property(struct power_supply *psy,
44 enum power_supply_property psp,
45 union power_supply_propval *val)
46{
Krzysztof Kozlowski297d7162015-03-12 08:44:11 +010047 struct charger_data *charger = power_supply_get_drvdata(psy);
Donggeun Kim149c0772011-06-22 19:40:06 +090048 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, &reg);
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, &reg);
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, &reg);
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
Krzysztof Kozlowski297d7162015-03-12 08:44:11 +010088static const struct power_supply_desc max8997_battery_desc = {
89 .name = "max8997_pmic",
90 .type = POWER_SUPPLY_TYPE_BATTERY,
91 .get_property = max8997_battery_get_property,
92 .properties = max8997_battery_props,
93 .num_properties = ARRAY_SIZE(max8997_battery_props),
94};
95
Bill Pembertonc8afa642012-11-19 13:22:23 -050096static int max8997_battery_probe(struct platform_device *pdev)
Donggeun Kim149c0772011-06-22 19:40:06 +090097{
98 int ret = 0;
99 struct charger_data *charger;
100 struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
101 struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev);
Krzysztof Kozlowski297d7162015-03-12 08:44:11 +0100102 struct power_supply_config psy_cfg = {};
Donggeun Kim149c0772011-06-22 19:40:06 +0900103
104 if (!pdata)
105 return -EINVAL;
106
107 if (pdata->eoc_mA) {
Jonghwan Choi44abd772011-10-29 07:56:32 +0900108 int val = (pdata->eoc_mA - 50) / 10;
Donggeun Kim149c0772011-06-22 19:40:06 +0900109 if (val < 0)
110 val = 0;
111 if (val > 0xf)
112 val = 0xf;
113
114 ret = max8997_update_reg(iodev->i2c,
115 MAX8997_REG_MBCCTRL5, val, 0xf);
116 if (ret < 0) {
117 dev_err(&pdev->dev, "Cannot use i2c bus.\n");
118 return ret;
119 }
120 }
121
122 switch (pdata->timeout) {
123 case 5:
124 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
125 0x2 << 4, 0x7 << 4);
126 break;
127 case 6:
128 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
129 0x3 << 4, 0x7 << 4);
130 break;
131 case 7:
132 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
133 0x4 << 4, 0x7 << 4);
134 break;
135 case 0:
136 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
137 0x7 << 4, 0x7 << 4);
138 break;
139 default:
140 dev_err(&pdev->dev, "incorrect timeout value (%d)\n",
141 pdata->timeout);
142 return -EINVAL;
143 }
144 if (ret < 0) {
145 dev_err(&pdev->dev, "Cannot use i2c bus.\n");
146 return ret;
147 }
148
Jingoo Hand4a20f52013-03-11 15:34:55 +0900149 charger = devm_kzalloc(&pdev->dev, sizeof(struct charger_data),
150 GFP_KERNEL);
Donggeun Kim149c0772011-06-22 19:40:06 +0900151 if (charger == NULL) {
152 dev_err(&pdev->dev, "Cannot allocate memory.\n");
153 return -ENOMEM;
154 }
155
156 platform_set_drvdata(pdev, charger);
157
Donggeun Kim149c0772011-06-22 19:40:06 +0900158
159 charger->dev = &pdev->dev;
160 charger->iodev = iodev;
161
Krzysztof Kozlowski297d7162015-03-12 08:44:11 +0100162 psy_cfg.drv_data = charger;
163
164 charger->battery = power_supply_register(&pdev->dev,
165 &max8997_battery_desc,
166 &psy_cfg);
167 if (IS_ERR(charger->battery)) {
Donggeun Kim149c0772011-06-22 19:40:06 +0900168 dev_err(&pdev->dev, "failed: power supply register\n");
Krzysztof Kozlowski297d7162015-03-12 08:44:11 +0100169 return PTR_ERR(charger->battery);
Donggeun Kim149c0772011-06-22 19:40:06 +0900170 }
171
172 return 0;
Donggeun Kim149c0772011-06-22 19:40:06 +0900173}
174
Bill Pemberton415ec692012-11-19 13:26:07 -0500175static int max8997_battery_remove(struct platform_device *pdev)
Donggeun Kim149c0772011-06-22 19:40:06 +0900176{
177 struct charger_data *charger = platform_get_drvdata(pdev);
178
Krzysztof Kozlowski297d7162015-03-12 08:44:11 +0100179 power_supply_unregister(charger->battery);
Donggeun Kim149c0772011-06-22 19:40:06 +0900180 return 0;
181}
182
183static const struct platform_device_id max8997_battery_id[] = {
184 { "max8997-battery", 0 },
Axel Linc03bfab2011-08-01 07:23:00 +0800185 { }
Donggeun Kim149c0772011-06-22 19:40:06 +0900186};
187
188static struct platform_driver max8997_battery_driver = {
189 .driver = {
190 .name = "max8997-battery",
Donggeun Kim149c0772011-06-22 19:40:06 +0900191 },
192 .probe = max8997_battery_probe,
Bill Pemberton28ea73f2012-11-19 13:20:40 -0500193 .remove = max8997_battery_remove,
Donggeun Kim149c0772011-06-22 19:40:06 +0900194 .id_table = max8997_battery_id,
195};
196
197static int __init max8997_battery_init(void)
198{
199 return platform_driver_register(&max8997_battery_driver);
200}
201subsys_initcall(max8997_battery_init);
202
203static void __exit max8997_battery_cleanup(void)
204{
205 platform_driver_unregister(&max8997_battery_driver);
206}
207module_exit(max8997_battery_cleanup);
208
209MODULE_DESCRIPTION("MAXIM 8997/8966 battery control driver");
210MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
211MODULE_LICENSE("GPL");