[deliverable/linux.git] / drivers / power / max17040_battery.c

/*
 *  max17040_battery.c
 *  fuel-gauge systems for lithium-ion (Li+) batteries
 *
 *  Copyright (C) 2009 Samsung Electronics
 *  Minkyu Kang <mk7.kang@samsung.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/mutex.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/power_supply.h>
#include <linux/max17040_battery.h>

#define MAX17040_VCELL_MSB	0x02
#define MAX17040_VCELL_LSB	0x03
#define MAX17040_SOC_MSB	0x04
#define MAX17040_SOC_LSB	0x05
#define MAX17040_MODE_MSB	0x06
#define MAX17040_MODE_LSB	0x07
#define MAX17040_VER_MSB	0x08
#define MAX17040_VER_LSB	0x09
#define MAX17040_RCOMP_MSB	0x0C
#define MAX17040_RCOMP_LSB	0x0D
#define MAX17040_CMD_MSB	0xFE
#define MAX17040_CMD_LSB	0xFF

#define MAX17040_DELAY		1000
#define MAX17040_BATTERY_FULL	95

struct max17040_chip {
	struct i2c_client		*client;
	struct delayed_work		work;
	struct power_supply		battery;
	struct max17040_platform_data	*pdata;

	/* State Of Connect */
	int online;
	/* battery voltage */
	int vcell;
	/* battery capacity */
	int soc;
	/* State Of Charge */
	int status;
};

static int max17040_get_property(struct power_supply *psy,
			    enum power_supply_property psp,
			    union power_supply_propval *val)
{
	struct max17040_chip *chip = container_of(psy,
				struct max17040_chip, battery);

	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
		val->intval = chip->status;
		break;
	case POWER_SUPPLY_PROP_ONLINE:
		val->intval = chip->online;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
		val->intval = chip->vcell;
		break;
	case POWER_SUPPLY_PROP_CAPACITY:
		val->intval = chip->soc;
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

static int max17040_write_reg(struct i2c_client *client, int reg, u8 value)
{
	int ret;

	ret = i2c_smbus_write_byte_data(client, reg, value);

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

	return ret;
}

static int max17040_read_reg(struct i2c_client *client, int reg)
{
	int ret;

	ret = i2c_smbus_read_byte_data(client, reg);

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

	return ret;
}

static void max17040_reset(struct i2c_client *client)
{
	max17040_write_reg(client, MAX17040_CMD_MSB, 0x54);
	max17040_write_reg(client, MAX17040_CMD_LSB, 0x00);
}

static void max17040_get_vcell(struct i2c_client *client)
{
	struct max17040_chip *chip = i2c_get_clientdata(client);
	u8 msb;
	u8 lsb;

	msb = max17040_read_reg(client, MAX17040_VCELL_MSB);
	lsb = max17040_read_reg(client, MAX17040_VCELL_LSB);

	chip->vcell = (msb << 4) + (lsb >> 4);
}

static void max17040_get_soc(struct i2c_client *client)
{
	struct max17040_chip *chip = i2c_get_clientdata(client);
	u8 msb;
	u8 lsb;

	msb = max17040_read_reg(client, MAX17040_SOC_MSB);
	lsb = max17040_read_reg(client, MAX17040_SOC_LSB);

	chip->soc = msb;
}

static void max17040_get_version(struct i2c_client *client)
{
	u8 msb;
	u8 lsb;

	msb = max17040_read_reg(client, MAX17040_VER_MSB);
	lsb = max17040_read_reg(client, MAX17040_VER_LSB);

	dev_info(&client->dev, "MAX17040 Fuel-Gauge Ver %d%d\n", msb, lsb);
}

static void max17040_get_online(struct i2c_client *client)
{
	struct max17040_chip *chip = i2c_get_clientdata(client);

	if (chip->pdata->battery_online)
		chip->online = chip->pdata->battery_online();
	else
		chip->online = 1;
}

static void max17040_get_status(struct i2c_client *client)
{
	struct max17040_chip *chip = i2c_get_clientdata(client);

	if (!chip->pdata->charger_online || !chip->pdata->charger_enable) {
		chip->status = POWER_SUPPLY_STATUS_UNKNOWN;
		return;
	}

	if (chip->pdata->charger_online()) {
		if (chip->pdata->charger_enable())
			chip->status = POWER_SUPPLY_STATUS_CHARGING;
		else
			chip->status = POWER_SUPPLY_STATUS_NOT_CHARGING;
	} else {
		chip->status = POWER_SUPPLY_STATUS_DISCHARGING;
	}

	if (chip->soc > MAX17040_BATTERY_FULL)
		chip->status = POWER_SUPPLY_STATUS_FULL;
}

static void max17040_work(struct work_struct *work)
{
	struct max17040_chip *chip;

	chip = container_of(work, struct max17040_chip, work.work);

	max17040_get_vcell(chip->client);
	max17040_get_soc(chip->client);
	max17040_get_online(chip->client);
	max17040_get_status(chip->client);

	schedule_delayed_work(&chip->work, MAX17040_DELAY);
}

static enum power_supply_property max17040_battery_props[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_ONLINE,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_CAPACITY,
};

static int __devinit max17040_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
	struct max17040_chip *chip;
	int ret;

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
		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		= "battery";
	chip->battery.type		= POWER_SUPPLY_TYPE_BATTERY;
	chip->battery.get_property	= max17040_get_property;
	chip->battery.properties	= max17040_battery_props;
	chip->battery.num_properties	= ARRAY_SIZE(max17040_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;
	}

	max17040_reset(client);
	max17040_get_version(client);

	INIT_DELAYED_WORK_DEFERRABLE(&chip->work, max17040_work);
	schedule_delayed_work(&chip->work, MAX17040_DELAY);

	return 0;
}

static int __devexit max17040_remove(struct i2c_client *client)
{
	struct max17040_chip *chip = i2c_get_clientdata(client);

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

#ifdef CONFIG_PM

static int max17040_suspend(struct i2c_client *client,
		pm_message_t state)
{
	struct max17040_chip *chip = i2c_get_clientdata(client);

	cancel_delayed_work(&chip->work);
	return 0;
}

static int max17040_resume(struct i2c_client *client)
{
	struct max17040_chip *chip = i2c_get_clientdata(client);

	schedule_delayed_work(&chip->work, MAX17040_DELAY);
	return 0;
}

#else

#define max17040_suspend NULL
#define max17040_resume NULL

#endif /* CONFIG_PM */

static const struct i2c_device_id max17040_id[] = {
	{ "max17040", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, max17040_id);

static struct i2c_driver max17040_i2c_driver = {
	.driver	= {
		.name	= "max17040",
	},
	.probe		= max17040_probe,
	.remove		= __devexit_p(max17040_remove),
	.suspend	= max17040_suspend,
	.resume		= max17040_resume,
	.id_table	= max17040_id,
};

static int __init max17040_init(void)
{
	return i2c_add_driver(&max17040_i2c_driver);
}
module_init(max17040_init);

static void __exit max17040_exit(void)
{
	i2c_del_driver(&max17040_i2c_driver);
}
module_exit(max17040_exit);

MODULE_AUTHOR("Minkyu Kang <mk7.kang@samsung.com>");
MODULE_DESCRIPTION("MAX17040 Fuel Gauge");
MODULE_LICENSE("GPL");
Commit	Line	Data
c6f4a42d MK	1	/*
	2	* max17040_battery.c
	3	* fuel-gauge systems for lithium-ion (Li+) batteries
	4	*
	5	* Copyright (C) 2009 Samsung Electronics
	6	* Minkyu Kang <mk7.kang@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 version 2 as
	10	* published by the Free Software Foundation.
	11	*/
	12
	13	#include <linux/module.h>
	14	#include <linux/init.h>
	15	#include <linux/platform_device.h>
	16	#include <linux/mutex.h>
	17	#include <linux/err.h>
	18	#include <linux/i2c.h>
	19	#include <linux/delay.h>
	20	#include <linux/power_supply.h>
	21	#include <linux/max17040_battery.h>
	22
	23	#define MAX17040_VCELL_MSB 0x02
	24	#define MAX17040_VCELL_LSB 0x03
	25	#define MAX17040_SOC_MSB 0x04
	26	#define MAX17040_SOC_LSB 0x05
	27	#define MAX17040_MODE_MSB 0x06
	28	#define MAX17040_MODE_LSB 0x07
	29	#define MAX17040_VER_MSB 0x08
	30	#define MAX17040_VER_LSB 0x09
	31	#define MAX17040_RCOMP_MSB 0x0C
	32	#define MAX17040_RCOMP_LSB 0x0D
	33	#define MAX17040_CMD_MSB 0xFE
	34	#define MAX17040_CMD_LSB 0xFF
	35
	36	#define MAX17040_DELAY 1000
	37	#define MAX17040_BATTERY_FULL 95
	38
	39	struct max17040_chip {
	40	struct i2c_client *client;
	41	struct delayed_work work;
	42	struct power_supply battery;
	43	struct max17040_platform_data *pdata;
	44
	45	/* State Of Connect */
	46	int online;
	47	/* battery voltage */
	48	int vcell;
	49	/* battery capacity */
	50	int soc;
	51	/* State Of Charge */
	52	int status;
	53	};
	54
	55	static int max17040_get_property(struct power_supply *psy,
	56	enum power_supply_property psp,
	57	union power_supply_propval *val)
	58	{
	59	struct max17040_chip *chip = container_of(psy,
	60	struct max17040_chip, battery);
	61
	62	switch (psp) {
	63	case POWER_SUPPLY_PROP_STATUS:
	64	val->intval = chip->status;
65	break;
66	case POWER_SUPPLY_PROP_ONLINE:
67	val->intval = chip->online;
68	break;
69	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
70	val->intval = chip->vcell;
71	break;
72	case POWER_SUPPLY_PROP_CAPACITY:
73	val->intval = chip->soc;
74	break;
75	default:
76	return -EINVAL;
77	}
78	return 0;
79	}
80
81	static int max17040_write_reg(struct i2c_client *client, int reg, u8 value)
82	{
83	int ret;
84
85	ret = i2c_smbus_write_byte_data(client, reg, value);
86
87	if (ret < 0)
88	dev_err(&client->dev, "%s: err %d\n", __func__, ret);
89
90	return ret;
91	}
92
93	static int max17040_read_reg(struct i2c_client *client, int reg)
94	{
95	int ret;
96
97	ret = i2c_smbus_read_byte_data(client, reg);
98
99	if (ret < 0)
100	dev_err(&client->dev, "%s: err %d\n", __func__, ret);
101
102	return ret;
103	}
104
105	static void max17040_reset(struct i2c_client *client)
106	{
107	max17040_write_reg(client, MAX17040_CMD_MSB, 0x54);
108	max17040_write_reg(client, MAX17040_CMD_LSB, 0x00);
109	}
110
111	static void max17040_get_vcell(struct i2c_client *client)
112	{
113	struct max17040_chip *chip = i2c_get_clientdata(client);
114	u8 msb;
115	u8 lsb;
116
117	msb = max17040_read_reg(client, MAX17040_VCELL_MSB);
118	lsb = max17040_read_reg(client, MAX17040_VCELL_LSB);
119
120	chip->vcell = (msb << 4) + (lsb >> 4);
121	}
122
123	static void max17040_get_soc(struct i2c_client *client)
124	{
125	struct max17040_chip *chip = i2c_get_clientdata(client);
126	u8 msb;
127	u8 lsb;
128
129	msb = max17040_read_reg(client, MAX17040_SOC_MSB);
130	lsb = max17040_read_reg(client, MAX17040_SOC_LSB);
131
132	chip->soc = msb;
133	}
134
135	static void max17040_get_version(struct i2c_client *client)
136	{
137	u8 msb;
138	u8 lsb;
139
140	msb = max17040_read_reg(client, MAX17040_VER_MSB);
141	lsb = max17040_read_reg(client, MAX17040_VER_LSB);
142
143	dev_info(&client->dev, "MAX17040 Fuel-Gauge Ver %d%d\n", msb, lsb);
144	}
145
146	static void max17040_get_online(struct i2c_client *client)
147	{
148	struct max17040_chip *chip = i2c_get_clientdata(client);
149
150	if (chip->pdata->battery_online)
151	chip->online = chip->pdata->battery_online();
152	else
153	chip->online = 1;
154	}
155
156	static void max17040_get_status(struct i2c_client *client)
157	{
158	struct max17040_chip *chip = i2c_get_clientdata(client);
159
160	if (!chip->pdata->charger_online \|\| !chip->pdata->charger_enable) {
161	chip->status = POWER_SUPPLY_STATUS_UNKNOWN;
162	return;
163	}
164
165	if (chip->pdata->charger_online()) {
166	if (chip->pdata->charger_enable())
167	chip->status = POWER_SUPPLY_STATUS_CHARGING;
168	else
169	chip->status = POWER_SUPPLY_STATUS_NOT_CHARGING;
170	} else {
171	chip->status = POWER_SUPPLY_STATUS_DISCHARGING;
172	}
173
174	if (chip->soc > MAX17040_BATTERY_FULL)
175	chip->status = POWER_SUPPLY_STATUS_FULL;
176	}
177
178	static void max17040_work(struct work_struct *work)
179	{
180	struct max17040_chip *chip;
181
182	chip = container_of(work, struct max17040_chip, work.work);
183
184	max17040_get_vcell(chip->client);
185	max17040_get_soc(chip->client);
186	max17040_get_online(chip->client);
187	max17040_get_status(chip->client);
188
189	schedule_delayed_work(&chip->work, MAX17040_DELAY);
190	}
191
192	static enum power_supply_property max17040_battery_props[] = {
193	POWER_SUPPLY_PROP_STATUS,
194	POWER_SUPPLY_PROP_ONLINE,
195	POWER_SUPPLY_PROP_VOLTAGE_NOW,
196	POWER_SUPPLY_PROP_CAPACITY,
197	};
198
199	static int __devinit max17040_probe(struct i2c_client *client,
200	const struct i2c_device_id *id)
201	{
202	struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
203	struct max17040_chip *chip;
204	int ret;
205
206	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
207	return -EIO;
208
209	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
210	if (!chip)
211	return -ENOMEM;
212
213	chip->client = client;
214	chip->pdata = client->dev.platform_data;
215
216	i2c_set_clientdata(client, chip);
217
218	chip->battery.name = "battery";
219	chip->battery.type = POWER_SUPPLY_TYPE_BATTERY;
220	chip->battery.get_property = max17040_get_property;
221	chip->battery.properties = max17040_battery_props;
222	chip->battery.num_properties = ARRAY_SIZE(max17040_battery_props);
223
224	ret = power_supply_register(&client->dev, &chip->battery);
225	if (ret) {
226	dev_err(&client->dev, "failed: power supply register\n");
227	i2c_set_clientdata(client, NULL);
228	kfree(chip);
229	return ret;
230	}
231
232	max17040_reset(client);
233	max17040_get_version(client);
234
235	INIT_DELAYED_WORK_DEFERRABLE(&chip->work, max17040_work);
236	schedule_delayed_work(&chip->work, MAX17040_DELAY);
237
238	return 0;
239	}
240
241	static int __devexit max17040_remove(struct i2c_client *client)
242	{
243	struct max17040_chip *chip = i2c_get_clientdata(client);
244
245	power_supply_unregister(&chip->battery);
246	cancel_delayed_work(&chip->work);
247	i2c_set_clientdata(client, NULL);
248	kfree(chip);
249	return 0;
250	}
251
252	#ifdef CONFIG_PM
253
254	static int max17040_suspend(struct i2c_client *client,
255	pm_message_t state)
256	{
257	struct max17040_chip *chip = i2c_get_clientdata(client);
258
259	cancel_delayed_work(&chip->work);
260	return 0;
261	}
262
263	static int max17040_resume(struct i2c_client *client)
264	{
265	struct max17040_chip *chip = i2c_get_clientdata(client);
266
267	schedule_delayed_work(&chip->work, MAX17040_DELAY);
268	return 0;
269	}
270
271	#else
272
273	#define max17040_suspend NULL
274	#define max17040_resume NULL
275
276	#endif /* CONFIG_PM */
277
278	static const struct i2c_device_id max17040_id[] = {
279	{ "max17040", 0 },
280	{ }
281	};
282	MODULE_DEVICE_TABLE(i2c, max17040_id);
283
284	static struct i2c_driver max17040_i2c_driver = {
285	.driver = {
286	.name = "max17040",
287	},
288	.probe = max17040_probe,
289	.remove = __devexit_p(max17040_remove),
290	.suspend = max17040_suspend,
291	.resume = max17040_resume,
292	.id_table = max17040_id,
293	};
294
295	static int __init max17040_init(void)
296	{
297	return i2c_add_driver(&max17040_i2c_driver);
298	}
299	module_init(max17040_init);
300
301	static void __exit max17040_exit(void)
302	{
303	i2c_del_driver(&max17040_i2c_driver);
304	}
305	module_exit(max17040_exit);
306
307	MODULE_AUTHOR("Minkyu Kang <mk7.kang@samsung.com>");
308	MODULE_DESCRIPTION("MAX17040 Fuel Gauge");
309	MODULE_LICENSE("GPL");