[GitHub/mt8127/android_kernel_alcatel_ttab.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 = container_of(psy,
			struct charger_data, battery);
	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 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);

	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->battery.name = "max8997_pmic";
	charger->battery.type = POWER_SUPPLY_TYPE_BATTERY;
	charger->battery.get_property = max8997_battery_get_property;
	charger->battery.properties = max8997_battery_props;
	charger->battery.num_properties = ARRAY_SIZE(max8997_battery_props);

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

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

	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",
		.owner = THIS_MODULE,
	},
	.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;
	33	struct power_supply battery;
	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	{
	47	struct charger_data *charger = container_of(psy,
	48	struct charger_data, battery);
	49	struct i2c_client *i2c = charger->iodev->i2c;
	50	int ret;
	51	u8 reg;
	52
	53	switch (psp) {
	54	case POWER_SUPPLY_PROP_STATUS:
	55	val->intval = 0;
	56	ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
	57	if (ret)
	58	return ret;
	59	if ((reg & (1 << 0)) == 0x1)
	60	val->intval = POWER_SUPPLY_STATUS_FULL;
	61
	62	break;
	63	case POWER_SUPPLY_PROP_PRESENT:
	64	val->intval = 0;
	65	ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
	66	if (ret)
	67	return ret;
	68	if ((reg & (1 << 2)) == 0x0)
	69	val->intval = 1;
	70
	71	break;
	72	case POWER_SUPPLY_PROP_ONLINE:
	73	val->intval = 0;
	74	ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
	75	if (ret)
	76	return ret;
	77	/* DCINOK */
	78	if (reg & (1 << 1))
	79	val->intval = 1;
	80
	81	break;
	82	default:
	83	return -EINVAL;
	84	}
	85
	86	return 0;
	87	}
88
c8afa640	89	static int max8997_battery_probe(struct platform_device *pdev)
149c077b DK	90	{
	91	int ret = 0;
	92	struct charger_data *charger;
	93	struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
	94	struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev);
	95
	96	if (!pdata)
	97	return -EINVAL;
	98
	99	if (pdata->eoc_mA) {
44abd774	100	int val = (pdata->eoc_mA - 50) / 10;
149c077b DK	101	if (val < 0)
	102	val = 0;
	103	if (val > 0xf)
	104	val = 0xf;
	105
	106	ret = max8997_update_reg(iodev->i2c,
	107	MAX8997_REG_MBCCTRL5, val, 0xf);
	108	if (ret < 0) {
	109	dev_err(&pdev->dev, "Cannot use i2c bus.\n");
	110	return ret;
	111	}
	112	}
	113
	114	switch (pdata->timeout) {
	115	case 5:
	116	ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
	117	0x2 << 4, 0x7 << 4);
	118	break;
	119	case 6:
	120	ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
	121	0x3 << 4, 0x7 << 4);
	122	break;
	123	case 7:
	124	ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
	125	0x4 << 4, 0x7 << 4);
	126	break;
	127	case 0:
	128	ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
	129	0x7 << 4, 0x7 << 4);
	130	break;
	131	default:
	132	dev_err(&pdev->dev, "incorrect timeout value (%d)\n",
	133	pdata->timeout);
	134	return -EINVAL;
	135	}
	136	if (ret < 0) {
	137	dev_err(&pdev->dev, "Cannot use i2c bus.\n");
	138	return ret;
	139	}
	140
d4a20f57 JH	141	charger = devm_kzalloc(&pdev->dev, sizeof(struct charger_data),
d4a20f57 JH	142	GFP_KERNEL);
149c077b DK	143	if (charger == NULL) {
	144	dev_err(&pdev->dev, "Cannot allocate memory.\n");
	145	return -ENOMEM;
	146	}
	147
	148	platform_set_drvdata(pdev, charger);
	149
	150	charger->battery.name = "max8997_pmic";
	151	charger->battery.type = POWER_SUPPLY_TYPE_BATTERY;
	152	charger->battery.get_property = max8997_battery_get_property;
	153	charger->battery.properties = max8997_battery_props;
	154	charger->battery.num_properties = ARRAY_SIZE(max8997_battery_props);
	155
	156	charger->dev = &pdev->dev;
	157	charger->iodev = iodev;
	158
	159	ret = power_supply_register(&pdev->dev, &charger->battery);
	160	if (ret) {
	161	dev_err(&pdev->dev, "failed: power supply register\n");
d4a20f57	162	return ret;
149c077b DK	163	}
	164
	165	return 0;
149c077b DK	166	}
149c077b DK	167
415ec69f	168	static int max8997_battery_remove(struct platform_device *pdev)
149c077b DK	169	{
	170	struct charger_data *charger = platform_get_drvdata(pdev);
	171
	172	power_supply_unregister(&charger->battery);
149c077b DK	173	return 0;
	174	}
	175
	176	static const struct platform_device_id max8997_battery_id[] = {
	177	{ "max8997-battery", 0 },
c03bfabb	178	{ }
149c077b DK	179	};
	180
	181	static struct platform_driver max8997_battery_driver = {
	182	.driver = {
	183	.name = "max8997-battery",
	184	.owner = THIS_MODULE,
	185	},
	186	.probe = max8997_battery_probe,
28ea73f4	187	.remove = max8997_battery_remove,
149c077b DK	188	.id_table = max8997_battery_id,
	189	};
	190
	191	static int __init max8997_battery_init(void)
	192	{
	193	return platform_driver_register(&max8997_battery_driver);
	194	}
	195	subsys_initcall(max8997_battery_init);
	196
	197	static void __exit max8997_battery_cleanup(void)
	198	{
	199	platform_driver_unregister(&max8997_battery_driver);
	200	}
	201	module_exit(max8997_battery_cleanup);
	202
	203	MODULE_DESCRIPTION("MAXIM 8997/8966 battery control driver");
	204	MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
	205	MODULE_LICENSE("GPL");