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
30struct max8998_battery_data {
31	struct device *dev;
32	struct max8998_dev *iodev;
33	struct power_supply *battery;
34};
35
36static 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" */
42static 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 = power_supply_get_drvdata(psy);
47	struct i2c_client *i2c = max8998->iodev->i2c;
48	int ret;
49	u8 reg;
50
51	switch (psp) {
52	case POWER_SUPPLY_PROP_PRESENT:
53		ret = max8998_read_reg(i2c, MAX8998_REG_STATUS2, &reg);
54		if (ret)
55			return ret;
56		if (reg & (1 << 4))
57			val->intval = 0;
58		else
59			val->intval = 1;
60		break;
61	case POWER_SUPPLY_PROP_ONLINE:
62		ret = max8998_read_reg(i2c, MAX8998_REG_STATUS2, &reg);
63		if (ret)
64			return ret;
65		if (reg & (1 << 3))
66			val->intval = 0;
67		else
68			val->intval = 1;
69		break;
70	default:
71		return -EINVAL;
72	}
73
74	return 0;
75}
76
77static const struct power_supply_desc max8998_battery_desc = {
78	.name		= "max8998_pmic",
79	.type		= POWER_SUPPLY_TYPE_BATTERY,
80	.get_property	= max8998_battery_get_property,
81	.properties	= max8998_battery_props,
82	.num_properties	= ARRAY_SIZE(max8998_battery_props),
83};
84
85static int max8998_battery_probe(struct platform_device *pdev)
86{
87	struct max8998_dev *iodev = dev_get_drvdata(pdev->dev.parent);
88	struct max8998_platform_data *pdata = dev_get_platdata(iodev->dev);
89	struct power_supply_config psy_cfg = {};
90	struct max8998_battery_data *max8998;
91	struct i2c_client *i2c;
92	int ret = 0;
93
94	if (!pdata) {
95		dev_err(pdev->dev.parent, "No platform init data supplied\n");
96		return -ENODEV;
97	}
98
99	max8998 = devm_kzalloc(&pdev->dev, sizeof(struct max8998_battery_data),
100				GFP_KERNEL);
101	if (!max8998)
102		return -ENOMEM;
103
104	max8998->dev = &pdev->dev;
105	max8998->iodev = iodev;
106	platform_set_drvdata(pdev, max8998);
107	i2c = max8998->iodev->i2c;
108
109	/* Setup "End of Charge" */
110	/* If EOC value equals 0,
111	 * remain value set from bootloader or default value */
112	if (pdata->eoc >= 10 && pdata->eoc <= 45) {
113		max8998_update_reg(i2c, MAX8998_REG_CHGR1,
114				(pdata->eoc / 5 - 2) << 5, 0x7 << 5);
115	} else if (pdata->eoc == 0) {
116		dev_dbg(max8998->dev,
117			"EOC value not set: leave it unchanged.\n");
118	} else {
119		dev_err(max8998->dev, "Invalid EOC value\n");
120		ret = -EINVAL;
121		goto err;
122	}
123
124	/* Setup Charge Restart Level */
125	switch (pdata->restart) {
126	case 100:
127		max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x1 << 3, 0x3 << 3);
128		break;
129	case 150:
130		max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x0 << 3, 0x3 << 3);
131		break;
132	case 200:
133		max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x2 << 3, 0x3 << 3);
134		break;
135	case -1:
136		max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x3 << 3, 0x3 << 3);
137		break;
138	case 0:
139		dev_dbg(max8998->dev,
140			"Restart Level not set: leave it unchanged.\n");
141		break;
142	default:
143		dev_err(max8998->dev, "Invalid Restart Level\n");
144		ret = -EINVAL;
145		goto err;
146	}
147
148	/* Setup Charge Full Timeout */
149	switch (pdata->timeout) {
150	case 5:
151		max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x0 << 4, 0x3 << 4);
152		break;
153	case 6:
154		max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x1 << 4, 0x3 << 4);
155		break;
156	case 7:
157		max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x2 << 4, 0x3 << 4);
158		break;
159	case -1:
160		max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x3 << 4, 0x3 << 4);
161		break;
162	case 0:
163		dev_dbg(max8998->dev,
164			"Full Timeout not set: leave it unchanged.\n");
165		break;
166	default:
167		dev_err(max8998->dev, "Invalid Full Timeout value\n");
168		ret = -EINVAL;
169		goto err;
170	}
171
172	psy_cfg.drv_data = max8998;
173
174	max8998->battery = power_supply_register(max8998->dev,
175						 &max8998_battery_desc,
176						 &psy_cfg);
177	if (IS_ERR(max8998->battery)) {
178		ret = PTR_ERR(max8998->battery);
179		dev_err(max8998->dev, "failed: power supply register: %d\n",
180			ret);
181		goto err;
182	}
183
184	return 0;
185err:
186	return ret;
187}
188
189static int max8998_battery_remove(struct platform_device *pdev)
190{
191	struct max8998_battery_data *max8998 = platform_get_drvdata(pdev);
192
193	power_supply_unregister(max8998->battery);
194
195	return 0;
196}
197
198static const struct platform_device_id max8998_battery_id[] = {
199	{ "max8998-battery", TYPE_MAX8998 },
200	{ }
201};
202
203static struct platform_driver max8998_battery_driver = {
204	.driver = {
205		.name = "max8998-battery",
206	},
207	.probe = max8998_battery_probe,
208	.remove = max8998_battery_remove,
209	.id_table = max8998_battery_id,
210};
211
212module_platform_driver(max8998_battery_driver);
213
214MODULE_DESCRIPTION("MAXIM 8998 battery control driver");
215MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
216MODULE_LICENSE("GPL");
217MODULE_ALIAS("platform:max8998-battery");
218