[linux-2.6-block.git] / drivers / power / max17042_battery.c

/*
 * Fuel gauge driver for Maxim 17042 / 8966 / 8997
 *  Note that Maxim 8966 and 8997 are mfd and this is its subdevice.
 *
 * 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
 *
 * This driver is based on max17040_battery.c
 */

#include <linux/init.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/mod_devicetable.h>
#include <linux/power_supply.h>
#include <linux/power/max17042_battery.h>

enum max17042_register {
	MAX17042_STATUS		= 0x00,
	MAX17042_VALRT_Th	= 0x01,
	MAX17042_TALRT_Th	= 0x02,
	MAX17042_SALRT_Th	= 0x03,
	MAX17042_AtRate		= 0x04,
	MAX17042_RepCap		= 0x05,
	MAX17042_RepSOC		= 0x06,
	MAX17042_Age		= 0x07,
	MAX17042_TEMP		= 0x08,
	MAX17042_VCELL		= 0x09,
	MAX17042_Current	= 0x0A,
	MAX17042_AvgCurrent	= 0x0B,
	MAX17042_Qresidual	= 0x0C,
	MAX17042_SOC		= 0x0D,
	MAX17042_AvSOC		= 0x0E,
	MAX17042_RemCap		= 0x0F,
	MAX17402_FullCAP	= 0x10,
	MAX17042_TTE		= 0x11,
	MAX17042_V_empty	= 0x12,

	MAX17042_RSLOW		= 0x14,

	MAX17042_AvgTA		= 0x16,
	MAX17042_Cycles		= 0x17,
	MAX17042_DesignCap	= 0x18,
	MAX17042_AvgVCELL	= 0x19,
	MAX17042_MinMaxTemp	= 0x1A,
	MAX17042_MinMaxVolt	= 0x1B,
	MAX17042_MinMaxCurr	= 0x1C,
	MAX17042_CONFIG		= 0x1D,
	MAX17042_ICHGTerm	= 0x1E,
	MAX17042_AvCap		= 0x1F,
	MAX17042_ManName	= 0x20,
	MAX17042_DevName	= 0x21,
	MAX17042_DevChem	= 0x22,

	MAX17042_TempNom	= 0x24,
	MAX17042_TempCold	= 0x25,
	MAX17042_TempHot	= 0x26,
	MAX17042_AIN		= 0x27,
	MAX17042_LearnCFG	= 0x28,
	MAX17042_SHFTCFG	= 0x29,
	MAX17042_RelaxCFG	= 0x2A,
	MAX17042_MiscCFG	= 0x2B,
	MAX17042_TGAIN		= 0x2C,
	MAx17042_TOFF		= 0x2D,
	MAX17042_CGAIN		= 0x2E,
	MAX17042_COFF		= 0x2F,

	MAX17042_Q_empty	= 0x33,
	MAX17042_T_empty	= 0x34,

	MAX17042_RCOMP0		= 0x38,
	MAX17042_TempCo		= 0x39,
	MAX17042_Rx		= 0x3A,
	MAX17042_T_empty0	= 0x3B,
	MAX17042_TaskPeriod	= 0x3C,
	MAX17042_FSTAT		= 0x3D,

	MAX17042_SHDNTIMER	= 0x3F,

	MAX17042_VFRemCap	= 0x4A,

	MAX17042_QH		= 0x4D,
	MAX17042_QL		= 0x4E,
};

struct max17042_chip {
	struct i2c_client *client;
	struct power_supply battery;
	struct max17042_platform_data *pdata;
};

static int max17042_write_reg(struct i2c_client *client, u8 reg, u16 value)
{
	int ret = i2c_smbus_write_word_data(client, reg, value);

	if (ret < 0)
		dev_err(&client->dev, "%s: err %d\n", __func__, ret);

	return ret;
}

static int max17042_read_reg(struct i2c_client *client, u8 reg)
{
	int ret = i2c_smbus_read_word_data(client, reg);

	if (ret < 0)
		dev_err(&client->dev, "%s: err %d\n", __func__, ret);

	return ret;
}

static enum power_supply_property max17042_battery_props[] = {
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_VOLTAGE_AVG,
	POWER_SUPPLY_PROP_CAPACITY,
};

static int max17042_get_property(struct power_supply *psy,
			    enum power_supply_property psp,
			    union power_supply_propval *val)
{
	struct max17042_chip *chip = container_of(psy,
				struct max17042_chip, battery);

	switch (psp) {
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
		val->intval = max17042_read_reg(chip->client,
				MAX17042_VCELL) * 83; /* 1000 / 12 = 83 */
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_AVG:
		val->intval = max17042_read_reg(chip->client,
				MAX17042_AvgVCELL) * 83;
		break;
	case POWER_SUPPLY_PROP_CAPACITY:
		val->intval = max17042_read_reg(chip->client,
				MAX17042_SOC) / 256;
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

static int __devinit max17042_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
	struct max17042_chip *chip;
	int ret;

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
		return -EIO;

	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
	if (!chip)
		return -ENOMEM;

	chip->client = client;
	chip->pdata = client->dev.platform_data;

	i2c_set_clientdata(client, chip);

	chip->battery.name		= "max17042_battery";
	chip->battery.type		= POWER_SUPPLY_TYPE_BATTERY;
	chip->battery.get_property	= max17042_get_property;
	chip->battery.properties	= max17042_battery_props;
	chip->battery.num_properties	= ARRAY_SIZE(max17042_battery_props);

	ret = power_supply_register(&client->dev, &chip->battery);
	if (ret) {
		dev_err(&client->dev, "failed: power supply register\n");
		i2c_set_clientdata(client, NULL);
		kfree(chip);
		return ret;
	}

	if (!chip->pdata->enable_current_sense) {
		max17042_write_reg(client, MAX17042_CGAIN, 0x0000);
		max17042_write_reg(client, MAX17042_MiscCFG, 0x0003);
		max17042_write_reg(client, MAX17042_LearnCFG, 0x0007);
	}

	return 0;
}

static int __devexit max17042_remove(struct i2c_client *client)
{
	struct max17042_chip *chip = i2c_get_clientdata(client);

	power_supply_unregister(&chip->battery);
	i2c_set_clientdata(client, NULL);
	kfree(chip);
	return 0;
}

static const struct i2c_device_id max17042_id[] = {
	{ "max17042", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, max17042_id);

static struct i2c_driver max17042_i2c_driver = {
	.driver	= {
		.name	= "max17042",
	},
	.probe		= max17042_probe,
	.remove		= __devexit_p(max17042_remove),
	.id_table	= max17042_id,
};

static int __init max17042_init(void)
{
	return i2c_add_driver(&max17042_i2c_driver);
}
module_init(max17042_init);

static void __exit max17042_exit(void)
{
	i2c_del_driver(&max17042_i2c_driver);
}
module_exit(max17042_exit);

MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
MODULE_DESCRIPTION("MAX17042 Fuel Gauge");
MODULE_LICENSE("GPL");
Commit	Line	Data
359ab9f5 MH	1	/*
	2	* Fuel gauge driver for Maxim 17042 / 8966 / 8997
	3	* Note that Maxim 8966 and 8997 are mfd and this is its subdevice.
	4	*
	5	* Copyright (C) 2011 Samsung Electronics
	6	* MyungJoo Ham <myungjoo.ham@samsung.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	21	*
	22	* This driver is based on max17040_battery.c
	23	*/
	24
	25	#include <linux/init.h>
	26	#include <linux/slab.h>
	27	#include <linux/i2c.h>
	28	#include <linux/mod_devicetable.h>
	29	#include <linux/power_supply.h>
	30	#include <linux/power/max17042_battery.h>
	31
	32	enum max17042_register {
	33	MAX17042_STATUS = 0x00,
	34	MAX17042_VALRT_Th = 0x01,
	35	MAX17042_TALRT_Th = 0x02,
	36	MAX17042_SALRT_Th = 0x03,
	37	MAX17042_AtRate = 0x04,
	38	MAX17042_RepCap = 0x05,
	39	MAX17042_RepSOC = 0x06,
	40	MAX17042_Age = 0x07,
	41	MAX17042_TEMP = 0x08,
	42	MAX17042_VCELL = 0x09,
	43	MAX17042_Current = 0x0A,
	44	MAX17042_AvgCurrent = 0x0B,
	45	MAX17042_Qresidual = 0x0C,
	46	MAX17042_SOC = 0x0D,
	47	MAX17042_AvSOC = 0x0E,
	48	MAX17042_RemCap = 0x0F,
	49	MAX17402_FullCAP = 0x10,
	50	MAX17042_TTE = 0x11,
	51	MAX17042_V_empty = 0x12,
	52
	53	MAX17042_RSLOW = 0x14,
	54
	55	MAX17042_AvgTA = 0x16,
	56	MAX17042_Cycles = 0x17,
	57	MAX17042_DesignCap = 0x18,
	58	MAX17042_AvgVCELL = 0x19,
	59	MAX17042_MinMaxTemp = 0x1A,
	60	MAX17042_MinMaxVolt = 0x1B,
	61	MAX17042_MinMaxCurr = 0x1C,
	62	MAX17042_CONFIG = 0x1D,
	63	MAX17042_ICHGTerm = 0x1E,
	64	MAX17042_AvCap = 0x1F,
65	MAX17042_ManName = 0x20,
66	MAX17042_DevName = 0x21,
67	MAX17042_DevChem = 0x22,
68
69	MAX17042_TempNom = 0x24,
70	MAX17042_TempCold = 0x25,
71	MAX17042_TempHot = 0x26,
72	MAX17042_AIN = 0x27,
73	MAX17042_LearnCFG = 0x28,
74	MAX17042_SHFTCFG = 0x29,
75	MAX17042_RelaxCFG = 0x2A,
76	MAX17042_MiscCFG = 0x2B,
77	MAX17042_TGAIN = 0x2C,
78	MAx17042_TOFF = 0x2D,
79	MAX17042_CGAIN = 0x2E,
80	MAX17042_COFF = 0x2F,
81
82	MAX17042_Q_empty = 0x33,
83	MAX17042_T_empty = 0x34,
84
85	MAX17042_RCOMP0 = 0x38,
86	MAX17042_TempCo = 0x39,
87	MAX17042_Rx = 0x3A,
88	MAX17042_T_empty0 = 0x3B,
89	MAX17042_TaskPeriod = 0x3C,
90	MAX17042_FSTAT = 0x3D,
91
92	MAX17042_SHDNTIMER = 0x3F,
93
94	MAX17042_VFRemCap = 0x4A,
95
96	MAX17042_QH = 0x4D,
97	MAX17042_QL = 0x4E,
98	};
99
100	struct max17042_chip {
101	struct i2c_client *client;
102	struct power_supply battery;
103	struct max17042_platform_data *pdata;
104	};
105
106	static int max17042_write_reg(struct i2c_client *client, u8 reg, u16 value)
107	{
108	int ret = i2c_smbus_write_word_data(client, reg, value);
109
110	if (ret < 0)
111	dev_err(&client->dev, "%s: err %d\n", __func__, ret);
112
113	return ret;
114	}
115
116	static int max17042_read_reg(struct i2c_client *client, u8 reg)
117	{
118	int ret = i2c_smbus_read_word_data(client, reg);
119
120	if (ret < 0)
121	dev_err(&client->dev, "%s: err %d\n", __func__, ret);
122
123	return ret;
124	}
125
126	static enum power_supply_property max17042_battery_props[] = {
127	POWER_SUPPLY_PROP_VOLTAGE_NOW,
128	POWER_SUPPLY_PROP_VOLTAGE_AVG,
129	POWER_SUPPLY_PROP_CAPACITY,
130	};
131
132	static int max17042_get_property(struct power_supply *psy,
133	enum power_supply_property psp,
134	union power_supply_propval *val)
135	{
136	struct max17042_chip *chip = container_of(psy,
137	struct max17042_chip, battery);
138
139	switch (psp) {
140	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
141	val->intval = max17042_read_reg(chip->client,
142	MAX17042_VCELL) * 83; /* 1000 / 12 = 83 */
143	break;
144	case POWER_SUPPLY_PROP_VOLTAGE_AVG:
145	val->intval = max17042_read_reg(chip->client,
146	MAX17042_AvgVCELL) * 83;
147	break;
148	case POWER_SUPPLY_PROP_CAPACITY:
149	val->intval = max17042_read_reg(chip->client,
150	MAX17042_SOC) / 256;
151	break;
152	default:
153	return -EINVAL;
154	}
155	return 0;
156	}
157
158	static int __devinit max17042_probe(struct i2c_client *client,
159	const struct i2c_device_id *id)
160	{
161	struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
162	struct max17042_chip *chip;
163	int ret;
164
165	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
166	return -EIO;
167
168	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
169	if (!chip)
170	return -ENOMEM;
171
172	chip->client = client;
173	chip->pdata = client->dev.platform_data;
174
175	i2c_set_clientdata(client, chip);
176
177	chip->battery.name = "max17042_battery";
178	chip->battery.type = POWER_SUPPLY_TYPE_BATTERY;
179	chip->battery.get_property = max17042_get_property;
180	chip->battery.properties = max17042_battery_props;
181	chip->battery.num_properties = ARRAY_SIZE(max17042_battery_props);
182
183	ret = power_supply_register(&client->dev, &chip->battery);
184	if (ret) {
185	dev_err(&client->dev, "failed: power supply register\n");
186	i2c_set_clientdata(client, NULL);
187	kfree(chip);
188	return ret;
189	}
190
191	if (!chip->pdata->enable_current_sense) {
192	max17042_write_reg(client, MAX17042_CGAIN, 0x0000);
193	max17042_write_reg(client, MAX17042_MiscCFG, 0x0003);
194	max17042_write_reg(client, MAX17042_LearnCFG, 0x0007);
195	}
196
197	return 0;
198	}
199
200	static int __devexit max17042_remove(struct i2c_client *client)
201	{
202	struct max17042_chip *chip = i2c_get_clientdata(client);
203
204	power_supply_unregister(&chip->battery);
205	i2c_set_clientdata(client, NULL);
206	kfree(chip);
207	return 0;
208	}
209
210	static const struct i2c_device_id max17042_id[] = {
211	{ "max17042", 0 },
212	{ }
213	};
214	MODULE_DEVICE_TABLE(i2c, max17042_id);
215
216	static struct i2c_driver max17042_i2c_driver = {
217	.driver = {
218	.name = "max17042",
219	},
220	.probe = max17042_probe,
221	.remove = __devexit_p(max17042_remove),
222	.id_table = max17042_id,
223	};
224
225	static int __init max17042_init(void)
226	{
227	return i2c_add_driver(&max17042_i2c_driver);
228	}
229	module_init(max17042_init);
230
231	static void __exit max17042_exit(void)
232	{
233	i2c_del_driver(&max17042_i2c_driver);
234	}
235	module_exit(max17042_exit);
236
237	MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
238	MODULE_DESCRIPTION("MAX17042 Fuel Gauge");
239	MODULE_LICENSE("GPL");