[linux-2.6-block.git] / drivers / power / max8997_charger.c

/*
 * max8997_charger.c - Power supply consumer driver for the Maxim 8997/8966
 *
 *  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
 */

#include <linux/err.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/mfd/max8997.h>
#include <linux/mfd/max8997-private.h>

struct charger_data {
	struct device *dev;
	struct max8997_dev *iodev;
	struct power_supply *battery;
};

static enum power_supply_property max8997_battery_props[] = {
	POWER_SUPPLY_PROP_STATUS, /* "FULL" or "NOT FULL" only. */
	POWER_SUPPLY_PROP_PRESENT, /* the presence of battery */
	POWER_SUPPLY_PROP_ONLINE, /* charger is active or not */
};

/* Note that the charger control is done by a current regulator "CHARGER" */
static int max8997_battery_get_property(struct power_supply *psy,
		enum power_supply_property psp,
		union power_supply_propval *val)
{
	struct charger_data *charger = power_supply_get_drvdata(psy);
	struct i2c_client *i2c = charger->iodev->i2c;
	int ret;
	u8 reg;

	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
		val->intval = 0;
		ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
		if (ret)
			return ret;
		if ((reg & (1 << 0)) == 0x1)
			val->intval = POWER_SUPPLY_STATUS_FULL;

		break;
	case POWER_SUPPLY_PROP_PRESENT:
		val->intval = 0;
		ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
		if (ret)
			return ret;
		if ((reg & (1 << 2)) == 0x0)
			val->intval = 1;

		break;
	case POWER_SUPPLY_PROP_ONLINE:
		val->intval = 0;
		ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
		if (ret)
			return ret;
		/* DCINOK */
		if (reg & (1 << 1))
			val->intval = 1;

		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static const struct power_supply_desc max8997_battery_desc = {
	.name		= "max8997_pmic",
	.type		= POWER_SUPPLY_TYPE_BATTERY,
	.get_property	= max8997_battery_get_property,
	.properties	= max8997_battery_props,
	.num_properties	= ARRAY_SIZE(max8997_battery_props),
};

static int max8997_battery_probe(struct platform_device *pdev)
{
	int ret = 0;
	struct charger_data *charger;
	struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
	struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev);
	struct power_supply_config psy_cfg = {};

	if (!pdata)
		return -EINVAL;

	if (pdata->eoc_mA) {
		int val = (pdata->eoc_mA - 50) / 10;
		if (val < 0)
			val = 0;
		if (val > 0xf)
			val = 0xf;

		ret = max8997_update_reg(iodev->i2c,
				MAX8997_REG_MBCCTRL5, val, 0xf);
		if (ret < 0) {
			dev_err(&pdev->dev, "Cannot use i2c bus.\n");
			return ret;
		}
	}

	switch (pdata->timeout) {
	case 5:
		ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
				0x2 << 4, 0x7 << 4);
		break;
	case 6:
		ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
				0x3 << 4, 0x7 << 4);
		break;
	case 7:
		ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
				0x4 << 4, 0x7 << 4);
		break;
	case 0:
		ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
				0x7 << 4, 0x7 << 4);
		break;
	default:
		dev_err(&pdev->dev, "incorrect timeout value (%d)\n",
				pdata->timeout);
		return -EINVAL;
	}
	if (ret < 0) {
		dev_err(&pdev->dev, "Cannot use i2c bus.\n");
		return ret;
	}

	charger = devm_kzalloc(&pdev->dev, sizeof(struct charger_data),
				GFP_KERNEL);
	if (charger == NULL) {
		dev_err(&pdev->dev, "Cannot allocate memory.\n");
		return -ENOMEM;
	}

	platform_set_drvdata(pdev, charger);


	charger->dev = &pdev->dev;
	charger->iodev = iodev;

	psy_cfg.drv_data = charger;

	charger->battery = power_supply_register(&pdev->dev,
						 &max8997_battery_desc,
						 &psy_cfg);
	if (IS_ERR(charger->battery)) {
		dev_err(&pdev->dev, "failed: power supply register\n");
		return PTR_ERR(charger->battery);
	}

	return 0;
}

static int max8997_battery_remove(struct platform_device *pdev)
{
	struct charger_data *charger = platform_get_drvdata(pdev);

	power_supply_unregister(charger->battery);
	return 0;
}

static const struct platform_device_id max8997_battery_id[] = {
	{ "max8997-battery", 0 },
	{ }
};

static struct platform_driver max8997_battery_driver = {
	.driver = {
		.name = "max8997-battery",
	},
	.probe = max8997_battery_probe,
	.remove = max8997_battery_remove,
	.id_table = max8997_battery_id,
};

static int __init max8997_battery_init(void)
{
	return platform_driver_register(&max8997_battery_driver);
}
subsys_initcall(max8997_battery_init);

static void __exit max8997_battery_cleanup(void)
{
	platform_driver_unregister(&max8997_battery_driver);
}
module_exit(max8997_battery_cleanup);

MODULE_DESCRIPTION("MAXIM 8997/8966 battery control driver");
MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
MODULE_LICENSE("GPL");
Commit	Line	Data
149c077b DK	1	/*
	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>
71aa79a8	23	#include <linux/module.h>
149c077b DK	24	#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
	30	struct charger_data {
	31	struct device *dev;
	32	struct max8997_dev *iodev;
297d716f	33	struct power_supply *battery;
149c077b DK	34	};
	35
	36	static 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" */
	43	static int max8997_battery_get_property(struct power_supply *psy,
	44	enum power_supply_property psp,
	45	union power_supply_propval *val)
	46	{
297d716f	47	struct charger_data *charger = power_supply_get_drvdata(psy);
149c077b DK	48	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
297d716f KK	88	static 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
c8afa640	96	static int max8997_battery_probe(struct platform_device *pdev)
149c077b DK	97	{
	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);
297d716f	102	struct power_supply_config psy_cfg = {};
149c077b DK	103
	104	if (!pdata)
	105	return -EINVAL;
	106
	107	if (pdata->eoc_mA) {
44abd774	108	int val = (pdata->eoc_mA - 50) / 10;
149c077b DK	109	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
d4a20f57 JH	149	charger = devm_kzalloc(&pdev->dev, sizeof(struct charger_data),
d4a20f57 JH	150	GFP_KERNEL);
149c077b DK	151	if (charger == NULL) {
	152	dev_err(&pdev->dev, "Cannot allocate memory.\n");
	153	return -ENOMEM;
	154	}
	155
	156	platform_set_drvdata(pdev, charger);
	157
149c077b DK	158
	159	charger->dev = &pdev->dev;
	160	charger->iodev = iodev;
	161
297d716f KK	162	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)) {
149c077b	168	dev_err(&pdev->dev, "failed: power supply register\n");
297d716f	169	return PTR_ERR(charger->battery);
149c077b DK	170	}
	171
	172	return 0;
149c077b DK	173	}
149c077b DK	174
415ec69f	175	static int max8997_battery_remove(struct platform_device *pdev)
149c077b DK	176	{
	177	struct charger_data *charger = platform_get_drvdata(pdev);
	178
297d716f	179	power_supply_unregister(charger->battery);
149c077b DK	180	return 0;
	181	}
	182
	183	static const struct platform_device_id max8997_battery_id[] = {
	184	{ "max8997-battery", 0 },
c03bfabb	185	{ }
149c077b DK	186	};
	187
	188	static struct platform_driver max8997_battery_driver = {
	189	.driver = {
	190	.name = "max8997-battery",
149c077b DK	191	},
149c077b DK	192	.probe = max8997_battery_probe,
28ea73f4	193	.remove = max8997_battery_remove,
149c077b DK	194	.id_table = max8997_battery_id,
	195	};
	196
	197	static int __init max8997_battery_init(void)
	198	{
	199	return platform_driver_register(&max8997_battery_driver);
	200	}
	201	subsys_initcall(max8997_battery_init);
	202
	203	static void __exit max8997_battery_cleanup(void)
	204	{
	205	platform_driver_unregister(&max8997_battery_driver);
	206	}
	207	module_exit(max8997_battery_cleanup);
	208
	209	MODULE_DESCRIPTION("MAXIM 8997/8966 battery control driver");
	210	MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
	211	MODULE_LICENSE("GPL");