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