[deliverable/linux.git] / drivers / power / max8903_charger.c

/*
 * max8903_charger.c - Maxim 8903 USB/Adapter Charger Driver
 *
 * 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/gpio.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_gpio.h>
#include <linux/slab.h>
#include <linux/power_supply.h>
#include <linux/platform_device.h>
#include <linux/power/max8903_charger.h>

struct max8903_data {
	struct max8903_pdata *pdata;
	struct device *dev;
	struct power_supply *psy;
	struct power_supply_desc psy_desc;
	bool fault;
	bool usb_in;
	bool ta_in;
};

static enum power_supply_property max8903_charger_props[] = {
	POWER_SUPPLY_PROP_STATUS, /* Charger status output */
	POWER_SUPPLY_PROP_ONLINE, /* External power source */
	POWER_SUPPLY_PROP_HEALTH, /* Fault or OK */
};

static int max8903_get_property(struct power_supply *psy,
		enum power_supply_property psp,
		union power_supply_propval *val)
{
	struct max8903_data *data = power_supply_get_drvdata(psy);

	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
		val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
		if (gpio_is_valid(data->pdata->chg)) {
			if (gpio_get_value(data->pdata->chg) == 0)
				val->intval = POWER_SUPPLY_STATUS_CHARGING;
			else if (data->usb_in || data->ta_in)
				val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
			else
				val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
		}
		break;
	case POWER_SUPPLY_PROP_ONLINE:
		val->intval = 0;
		if (data->usb_in || data->ta_in)
			val->intval = 1;
		break;
	case POWER_SUPPLY_PROP_HEALTH:
		val->intval = POWER_SUPPLY_HEALTH_GOOD;
		if (data->fault)
			val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static irqreturn_t max8903_dcin(int irq, void *_data)
{
	struct max8903_data *data = _data;
	struct max8903_pdata *pdata = data->pdata;
	bool ta_in;
	enum power_supply_type old_type;

	ta_in = gpio_get_value(pdata->dok) ? false : true;

	if (ta_in == data->ta_in)
		return IRQ_HANDLED;

	data->ta_in = ta_in;

	/* Set Current-Limit-Mode 1:DC 0:USB */
	if (gpio_is_valid(pdata->dcm))
		gpio_set_value(pdata->dcm, ta_in ? 1 : 0);

	/* Charger Enable / Disable (cen is negated) */
	if (gpio_is_valid(pdata->cen))
		gpio_set_value(pdata->cen, ta_in ? 0 :
				(data->usb_in ? 0 : 1));

	dev_dbg(data->dev, "TA(DC-IN) Charger %s.\n", ta_in ?
			"Connected" : "Disconnected");

	old_type = data->psy_desc.type;

	if (data->ta_in)
		data->psy_desc.type = POWER_SUPPLY_TYPE_MAINS;
	else if (data->usb_in)
		data->psy_desc.type = POWER_SUPPLY_TYPE_USB;
	else
		data->psy_desc.type = POWER_SUPPLY_TYPE_BATTERY;

	if (old_type != data->psy_desc.type)
		power_supply_changed(data->psy);

	return IRQ_HANDLED;
}

static irqreturn_t max8903_usbin(int irq, void *_data)
{
	struct max8903_data *data = _data;
	struct max8903_pdata *pdata = data->pdata;
	bool usb_in;
	enum power_supply_type old_type;

	usb_in = gpio_get_value(pdata->uok) ? false : true;

	if (usb_in == data->usb_in)
		return IRQ_HANDLED;

	data->usb_in = usb_in;

	/* Do not touch Current-Limit-Mode */

	/* Charger Enable / Disable (cen is negated) */
	if (gpio_is_valid(pdata->cen))
		gpio_set_value(pdata->cen, usb_in ? 0 :
				(data->ta_in ? 0 : 1));

	dev_dbg(data->dev, "USB Charger %s.\n", usb_in ?
			"Connected" : "Disconnected");

	old_type = data->psy_desc.type;

	if (data->ta_in)
		data->psy_desc.type = POWER_SUPPLY_TYPE_MAINS;
	else if (data->usb_in)
		data->psy_desc.type = POWER_SUPPLY_TYPE_USB;
	else
		data->psy_desc.type = POWER_SUPPLY_TYPE_BATTERY;

	if (old_type != data->psy_desc.type)
		power_supply_changed(data->psy);

	return IRQ_HANDLED;
}

static irqreturn_t max8903_fault(int irq, void *_data)
{
	struct max8903_data *data = _data;
	struct max8903_pdata *pdata = data->pdata;
	bool fault;

	fault = gpio_get_value(pdata->flt) ? false : true;

	if (fault == data->fault)
		return IRQ_HANDLED;

	data->fault = fault;

	if (fault)
		dev_err(data->dev, "Charger suffers a fault and stops.\n");
	else
		dev_err(data->dev, "Charger recovered from a fault.\n");

	return IRQ_HANDLED;
}

static struct max8903_pdata *max8903_parse_dt_data(struct device *dev)
{
	struct device_node *np = dev->of_node;
	struct max8903_pdata *pdata = NULL;

	if (!np)
		return NULL;

	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
		return NULL;

	pdata->dc_valid = false;
	pdata->usb_valid = false;

	pdata->cen = of_get_named_gpio(np, "cen-gpios", 0);
	if (!gpio_is_valid(pdata->cen))
		pdata->cen = -EINVAL;

	pdata->chg = of_get_named_gpio(np, "chg-gpios", 0);
	if (!gpio_is_valid(pdata->chg))
		pdata->chg = -EINVAL;

	pdata->flt = of_get_named_gpio(np, "flt-gpios", 0);
	if (!gpio_is_valid(pdata->flt))
		pdata->flt = -EINVAL;

	pdata->usus = of_get_named_gpio(np, "usus-gpios", 0);
	if (!gpio_is_valid(pdata->usus))
		pdata->usus = -EINVAL;

	pdata->dcm = of_get_named_gpio(np, "dcm-gpios", 0);
	if (!gpio_is_valid(pdata->dcm))
		pdata->dcm = -EINVAL;

	pdata->dok = of_get_named_gpio(np, "dok-gpios", 0);
	if (!gpio_is_valid(pdata->dok))
		pdata->dok = -EINVAL;
	else
		pdata->dc_valid = true;

	pdata->uok = of_get_named_gpio(np, "uok-gpios", 0);
	if (!gpio_is_valid(pdata->uok))
		pdata->uok = -EINVAL;
	else
		pdata->usb_valid = true;

	return pdata;
}

static int max8903_setup_gpios(struct platform_device *pdev)
{
	struct max8903_data *data = platform_get_drvdata(pdev);
	struct device *dev = &pdev->dev;
	struct max8903_pdata *pdata = pdev->dev.platform_data;
	int ret = 0;
	int gpio;
	int ta_in = 0;
	int usb_in = 0;

	if (pdata->dc_valid) {
		if (gpio_is_valid(pdata->dok)) {
			ret = devm_gpio_request(dev, pdata->dok,
						data->psy_desc.name);
			if (ret) {
				dev_err(dev,
					"Failed GPIO request for dok: %d err %d\n",
					pdata->dok, ret);
				return ret;
			}

			gpio = pdata->dok; /* PULL_UPed Interrupt */
			ta_in = gpio_get_value(gpio) ? 0 : 1;
		} else {
			dev_err(dev, "When DC is wired, DOK should be wired as well.\n");
			return -EINVAL;
		}
	}

	if (gpio_is_valid(pdata->dcm)) {
		ret = devm_gpio_request(dev, pdata->dcm, data->psy_desc.name);
		if (ret) {
			dev_err(dev,
				"Failed GPIO request for dcm: %d err %d\n",
				pdata->dcm, ret);
			return ret;
		}

		gpio = pdata->dcm; /* Output */
		gpio_set_value(gpio, ta_in);
	}

	if (pdata->usb_valid) {
		if (gpio_is_valid(pdata->uok)) {
			ret = devm_gpio_request(dev, pdata->uok,
						data->psy_desc.name);
			if (ret) {
				dev_err(dev,
					"Failed GPIO request for uok: %d err %d\n",
					pdata->uok, ret);
				return ret;
			}

			gpio = pdata->uok;
			usb_in = gpio_get_value(gpio) ? 0 : 1;
		} else {
			dev_err(dev, "When USB is wired, UOK should be wired."
					"as well.\n");
			return -EINVAL;
		}
	}

	if (gpio_is_valid(pdata->cen)) {
		ret = devm_gpio_request(dev, pdata->cen, data->psy_desc.name);
		if (ret) {
			dev_err(dev,
				"Failed GPIO request for cen: %d err %d\n",
				pdata->cen, ret);
			return ret;
		}

		gpio_set_value(pdata->cen, (ta_in || usb_in) ? 0 : 1);
	}

	if (gpio_is_valid(pdata->chg)) {
		ret = devm_gpio_request(dev, pdata->chg, data->psy_desc.name);
		if (ret) {
			dev_err(dev,
				"Failed GPIO request for chg: %d err %d\n",
				pdata->chg, ret);
			return ret;
		}
	}

	if (gpio_is_valid(pdata->flt)) {
		ret = devm_gpio_request(dev, pdata->flt, data->psy_desc.name);
		if (ret) {
			dev_err(dev,
				"Failed GPIO request for flt: %d err %d\n",
				pdata->flt, ret);
			return ret;
		}
	}

	if (gpio_is_valid(pdata->usus)) {
		ret = devm_gpio_request(dev, pdata->usus, data->psy_desc.name);
		if (ret) {
			dev_err(dev,
				"Failed GPIO request for usus: %d err %d\n",
				pdata->usus, ret);
			return ret;
		}
	}

	data->fault = false;
	data->ta_in = ta_in;
	data->usb_in = usb_in;

	return 0;
}

static int max8903_probe(struct platform_device *pdev)
{
	struct max8903_data *data;
	struct device *dev = &pdev->dev;
	struct max8903_pdata *pdata = pdev->dev.platform_data;
	struct power_supply_config psy_cfg = {};
	int ret = 0;

	data = devm_kzalloc(dev, sizeof(struct max8903_data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	if (IS_ENABLED(CONFIG_OF) && !pdata && dev->of_node)
		pdata = max8903_parse_dt_data(dev);

	if (!pdata) {
		dev_err(dev, "No platform data.\n");
		return -EINVAL;
	}

	pdev->dev.platform_data = pdata;
	data->pdata = pdata;
	data->dev = dev;
	platform_set_drvdata(pdev, data);

	if (pdata->dc_valid == false && pdata->usb_valid == false) {
		dev_err(dev, "No valid power sources.\n");
		return -EINVAL;
	}

	ret = max8903_setup_gpios(pdev);
	if (ret)
		return ret;

	data->psy_desc.name = "max8903_charger";
	data->psy_desc.type = (data->ta_in) ? POWER_SUPPLY_TYPE_MAINS :
			((data->usb_in) ? POWER_SUPPLY_TYPE_USB :
			 POWER_SUPPLY_TYPE_BATTERY);
	data->psy_desc.get_property = max8903_get_property;
	data->psy_desc.properties = max8903_charger_props;
	data->psy_desc.num_properties = ARRAY_SIZE(max8903_charger_props);

	psy_cfg.of_node = dev->of_node;
	psy_cfg.drv_data = data;

	data->psy = devm_power_supply_register(dev, &data->psy_desc, &psy_cfg);
	if (IS_ERR(data->psy)) {
		dev_err(dev, "failed: power supply register.\n");
		return PTR_ERR(data->psy);
	}

	if (pdata->dc_valid) {
		ret = devm_request_threaded_irq(dev, gpio_to_irq(pdata->dok),
					NULL, max8903_dcin,
					IRQF_TRIGGER_FALLING |
					IRQF_TRIGGER_RISING | IRQF_ONESHOT,
					"MAX8903 DC IN", data);
		if (ret) {
			dev_err(dev, "Cannot request irq %d for DC (%d)\n",
					gpio_to_irq(pdata->dok), ret);
			return ret;
		}
	}

	if (pdata->usb_valid) {
		ret = devm_request_threaded_irq(dev, gpio_to_irq(pdata->uok),
					NULL, max8903_usbin,
					IRQF_TRIGGER_FALLING |
					IRQF_TRIGGER_RISING | IRQF_ONESHOT,
					"MAX8903 USB IN", data);
		if (ret) {
			dev_err(dev, "Cannot request irq %d for USB (%d)\n",
					gpio_to_irq(pdata->uok), ret);
			return ret;
		}
	}

	if (gpio_is_valid(pdata->flt)) {
		ret = devm_request_threaded_irq(dev, gpio_to_irq(pdata->flt),
					NULL, max8903_fault,
					IRQF_TRIGGER_FALLING |
					IRQF_TRIGGER_RISING | IRQF_ONESHOT,
					"MAX8903 Fault", data);
		if (ret) {
			dev_err(dev, "Cannot request irq %d for Fault (%d)\n",
					gpio_to_irq(pdata->flt), ret);
			return ret;
		}
	}

	return 0;
}

static const struct of_device_id max8903_match_ids[] = {
	{ .compatible = "maxim,max8903", },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, max8903_match_ids);

static struct platform_driver max8903_driver = {
	.probe	= max8903_probe,
	.driver = {
		.name	= "max8903-charger",
		.of_match_table = max8903_match_ids
	},
};

module_platform_driver(max8903_driver);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("MAX8903 Charger Driver");
MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
MODULE_ALIAS("platform:max8903-charger");
Commit	Line	Data
b14a9ccc MH	1	/*
	2	* max8903_charger.c - Maxim 8903 USB/Adapter Charger Driver
	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
	23	#include <linux/gpio.h>
	24	#include <linux/interrupt.h>
7e6d62db	25	#include <linux/module.h>
c5ed3307 CL	26	#include <linux/of.h>
	27	#include <linux/of_device.h>
	28	#include <linux/of_gpio.h>
b14a9ccc MH	29	#include <linux/slab.h>
	30	#include <linux/power_supply.h>
	31	#include <linux/platform_device.h>
	32	#include <linux/power/max8903_charger.h>
	33
	34	struct max8903_data {
0c3ae04b	35	struct max8903_pdata *pdata;
b14a9ccc	36	struct device *dev;
297d716f KK	37	struct power_supply *psy;
297d716f KK	38	struct power_supply_desc psy_desc;
b14a9ccc MH	39	bool fault;
	40	bool usb_in;
	41	bool ta_in;
	42	};
	43
	44	static enum power_supply_property max8903_charger_props[] = {
	45	POWER_SUPPLY_PROP_STATUS, /* Charger status output */
	46	POWER_SUPPLY_PROP_ONLINE, /* External power source */
	47	POWER_SUPPLY_PROP_HEALTH, /* Fault or OK */
	48	};
	49
	50	static int max8903_get_property(struct power_supply *psy,
	51	enum power_supply_property psp,
	52	union power_supply_propval *val)
	53	{
297d716f	54	struct max8903_data *data = power_supply_get_drvdata(psy);
b14a9ccc MH	55
	56	switch (psp) {
	57	case POWER_SUPPLY_PROP_STATUS:
	58	val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
3525e5c5	59	if (gpio_is_valid(data->pdata->chg)) {
0c3ae04b	60	if (gpio_get_value(data->pdata->chg) == 0)
b14a9ccc MH	61	val->intval = POWER_SUPPLY_STATUS_CHARGING;
	62	else if (data->usb_in \|\| data->ta_in)
	63	val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
	64	else
	65	val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
	66	}
	67	break;
	68	case POWER_SUPPLY_PROP_ONLINE:
	69	val->intval = 0;
	70	if (data->usb_in \|\| data->ta_in)
	71	val->intval = 1;
	72	break;
	73	case POWER_SUPPLY_PROP_HEALTH:
	74	val->intval = POWER_SUPPLY_HEALTH_GOOD;
	75	if (data->fault)
	76	val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
	77	break;
	78	default:
	79	return -EINVAL;
	80	}
c5ed3307	81
b14a9ccc MH	82	return 0;
	83	}
	84
	85	static irqreturn_t max8903_dcin(int irq, void *_data)
	86	{
	87	struct max8903_data *data = _data;
0c3ae04b	88	struct max8903_pdata *pdata = data->pdata;
b14a9ccc MH	89	bool ta_in;
	90	enum power_supply_type old_type;
	91
	92	ta_in = gpio_get_value(pdata->dok) ? false : true;
	93
	94	if (ta_in == data->ta_in)
	95	return IRQ_HANDLED;
	96
	97	data->ta_in = ta_in;
	98
	99	/* Set Current-Limit-Mode 1:DC 0:USB */
3525e5c5	100	if (gpio_is_valid(pdata->dcm))
b14a9ccc MH	101	gpio_set_value(pdata->dcm, ta_in ? 1 : 0);
	102
	103	/* Charger Enable / Disable (cen is negated) */
3525e5c5	104	if (gpio_is_valid(pdata->cen))
b14a9ccc MH	105	gpio_set_value(pdata->cen, ta_in ? 0 :
	106	(data->usb_in ? 0 : 1));
	107
	108	dev_dbg(data->dev, "TA(DC-IN) Charger %s.\n", ta_in ?
	109	"Connected" : "Disconnected");
	110
297d716f	111	old_type = data->psy_desc.type;
b14a9ccc MH	112
b14a9ccc MH	113	if (data->ta_in)
297d716f	114	data->psy_desc.type = POWER_SUPPLY_TYPE_MAINS;
b14a9ccc	115	else if (data->usb_in)
297d716f	116	data->psy_desc.type = POWER_SUPPLY_TYPE_USB;
b14a9ccc	117	else
297d716f	118	data->psy_desc.type = POWER_SUPPLY_TYPE_BATTERY;
b14a9ccc	119
297d716f KK	120	if (old_type != data->psy_desc.type)
297d716f KK	121	power_supply_changed(data->psy);
b14a9ccc MH	122
	123	return IRQ_HANDLED;
	124	}
	125
	126	static irqreturn_t max8903_usbin(int irq, void *_data)
	127	{
	128	struct max8903_data *data = _data;
0c3ae04b	129	struct max8903_pdata *pdata = data->pdata;
b14a9ccc MH	130	bool usb_in;
	131	enum power_supply_type old_type;
	132
	133	usb_in = gpio_get_value(pdata->uok) ? false : true;
	134
	135	if (usb_in == data->usb_in)
	136	return IRQ_HANDLED;
	137
	138	data->usb_in = usb_in;
	139
	140	/* Do not touch Current-Limit-Mode */
	141
	142	/* Charger Enable / Disable (cen is negated) */
3525e5c5	143	if (gpio_is_valid(pdata->cen))
b14a9ccc MH	144	gpio_set_value(pdata->cen, usb_in ? 0 :
	145	(data->ta_in ? 0 : 1));
	146
	147	dev_dbg(data->dev, "USB Charger %s.\n", usb_in ?
	148	"Connected" : "Disconnected");
	149
297d716f	150	old_type = data->psy_desc.type;
b14a9ccc MH	151
b14a9ccc MH	152	if (data->ta_in)
297d716f	153	data->psy_desc.type = POWER_SUPPLY_TYPE_MAINS;
b14a9ccc	154	else if (data->usb_in)
297d716f	155	data->psy_desc.type = POWER_SUPPLY_TYPE_USB;
b14a9ccc	156	else
297d716f	157	data->psy_desc.type = POWER_SUPPLY_TYPE_BATTERY;
b14a9ccc	158
297d716f KK	159	if (old_type != data->psy_desc.type)
297d716f KK	160	power_supply_changed(data->psy);
b14a9ccc MH	161
	162	return IRQ_HANDLED;
	163	}
	164
	165	static irqreturn_t max8903_fault(int irq, void *_data)
	166	{
	167	struct max8903_data *data = _data;
0c3ae04b	168	struct max8903_pdata *pdata = data->pdata;
b14a9ccc MH	169	bool fault;
	170
	171	fault = gpio_get_value(pdata->flt) ? false : true;
	172
	173	if (fault == data->fault)
	174	return IRQ_HANDLED;
	175
	176	data->fault = fault;
	177
	178	if (fault)
	179	dev_err(data->dev, "Charger suffers a fault and stops.\n");
	180	else
	181	dev_err(data->dev, "Charger recovered from a fault.\n");
	182
	183	return IRQ_HANDLED;
	184	}
	185
c5ed3307 CL	186	static struct max8903_pdata max8903_parse_dt_data(struct device dev)
	187	{
	188	struct device_node *np = dev->of_node;
	189	struct max8903_pdata *pdata = NULL;
	190
	191	if (!np)
	192	return NULL;
	193
	194	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	195	if (!pdata)
	196	return NULL;
	197
	198	pdata->dc_valid = false;
	199	pdata->usb_valid = false;
	200
	201	pdata->cen = of_get_named_gpio(np, "cen-gpios", 0);
	202	if (!gpio_is_valid(pdata->cen))
	203	pdata->cen = -EINVAL;
	204
	205	pdata->chg = of_get_named_gpio(np, "chg-gpios", 0);
	206	if (!gpio_is_valid(pdata->chg))
	207	pdata->chg = -EINVAL;
	208
	209	pdata->flt = of_get_named_gpio(np, "flt-gpios", 0);
	210	if (!gpio_is_valid(pdata->flt))
	211	pdata->flt = -EINVAL;
	212
	213	pdata->usus = of_get_named_gpio(np, "usus-gpios", 0);
	214	if (!gpio_is_valid(pdata->usus))
	215	pdata->usus = -EINVAL;
	216
	217	pdata->dcm = of_get_named_gpio(np, "dcm-gpios", 0);
	218	if (!gpio_is_valid(pdata->dcm))
	219	pdata->dcm = -EINVAL;
	220
	221	pdata->dok = of_get_named_gpio(np, "dok-gpios", 0);
	222	if (!gpio_is_valid(pdata->dok))
	223	pdata->dok = -EINVAL;
	224	else
	225	pdata->dc_valid = true;
	226
	227	pdata->uok = of_get_named_gpio(np, "uok-gpios", 0);
	228	if (!gpio_is_valid(pdata->uok))
	229	pdata->uok = -EINVAL;
	230	else
	231	pdata->usb_valid = true;
	232
	233	return pdata;
	234	}
	235
88a469bb	236	static int max8903_setup_gpios(struct platform_device *pdev)
b14a9ccc	237	{
88a469bb	238	struct max8903_data *data = platform_get_drvdata(pdev);
b14a9ccc MH	239	struct device *dev = &pdev->dev;
	240	struct max8903_pdata *pdata = pdev->dev.platform_data;
	241	int ret = 0;
	242	int gpio;
	243	int ta_in = 0;
	244	int usb_in = 0;
	245
b14a9ccc	246	if (pdata->dc_valid) {
3525e5c5	247	if (gpio_is_valid(pdata->dok)) {
88a469bb CL	248	ret = devm_gpio_request(dev, pdata->dok,
	249	data->psy_desc.name);
	250	if (ret) {
	251	dev_err(dev,
	252	"Failed GPIO request for dok: %d err %d\n",
	253	pdata->dok, ret);
	254	return ret;
	255	}
	256
b14a9ccc MH	257	gpio = pdata->dok; /* PULL_UPed Interrupt */
b14a9ccc MH	258	ta_in = gpio_get_value(gpio) ? 0 : 1;
cbf9077e CL	259	} else {
	260	dev_err(dev, "When DC is wired, DOK should be wired as well.\n");
	261	return -EINVAL;
	262	}
	263	}
b14a9ccc	264
3525e5c5 CL	265	if (gpio_is_valid(pdata->dcm)) {
	266	ret = devm_gpio_request(dev, pdata->dcm, data->psy_desc.name);
	267	if (ret) {
	268	dev_err(dev,
	269	"Failed GPIO request for dcm: %d err %d\n",
	270	pdata->dcm, ret);
	271	return ret;
b14a9ccc	272	}
3525e5c5 CL	273
	274	gpio = pdata->dcm; /* Output */
	275	gpio_set_value(gpio, ta_in);
b14a9ccc MH	276	}
	277
	278	if (pdata->usb_valid) {
3525e5c5	279	if (gpio_is_valid(pdata->uok)) {
88a469bb CL	280	ret = devm_gpio_request(dev, pdata->uok,
	281	data->psy_desc.name);
	282	if (ret) {
	283	dev_err(dev,
	284	"Failed GPIO request for uok: %d err %d\n",
	285	pdata->uok, ret);
	286	return ret;
	287	}
	288
b14a9ccc MH	289	gpio = pdata->uok;
	290	usb_in = gpio_get_value(gpio) ? 0 : 1;
	291	} else {
	292	dev_err(dev, "When USB is wired, UOK should be wired."
	293	"as well.\n");
0df2deea	294	return -EINVAL;
b14a9ccc MH	295	}
	296	}
	297
3525e5c5 CL	298	if (gpio_is_valid(pdata->cen)) {
	299	ret = devm_gpio_request(dev, pdata->cen, data->psy_desc.name);
	300	if (ret) {
	301	dev_err(dev,
	302	"Failed GPIO request for cen: %d err %d\n",
	303	pdata->cen, ret);
	304	return ret;
b14a9ccc	305	}
3525e5c5 CL	306
3525e5c5 CL	307	gpio_set_value(pdata->cen, (ta_in \|\| usb_in) ? 0 : 1);
b14a9ccc MH	308	}
b14a9ccc MH	309
3525e5c5 CL	310	if (gpio_is_valid(pdata->chg)) {
	311	ret = devm_gpio_request(dev, pdata->chg, data->psy_desc.name);
	312	if (ret) {
	313	dev_err(dev,
	314	"Failed GPIO request for chg: %d err %d\n",
	315	pdata->chg, ret);
	316	return ret;
b14a9ccc MH	317	}
	318	}
	319
3525e5c5 CL	320	if (gpio_is_valid(pdata->flt)) {
	321	ret = devm_gpio_request(dev, pdata->flt, data->psy_desc.name);
	322	if (ret) {
	323	dev_err(dev,
	324	"Failed GPIO request for flt: %d err %d\n",
	325	pdata->flt, ret);
	326	return ret;
b14a9ccc MH	327	}
	328	}
	329
3525e5c5 CL	330	if (gpio_is_valid(pdata->usus)) {
	331	ret = devm_gpio_request(dev, pdata->usus, data->psy_desc.name);
	332	if (ret) {
	333	dev_err(dev,
	334	"Failed GPIO request for usus: %d err %d\n",
	335	pdata->usus, ret);
	336	return ret;
b14a9ccc MH	337	}
	338	}
	339
	340	data->fault = false;
	341	data->ta_in = ta_in;
	342	data->usb_in = usb_in;
	343
88a469bb CL	344	return 0;
	345	}
	346
	347	static int max8903_probe(struct platform_device *pdev)
	348	{
	349	struct max8903_data *data;
	350	struct device *dev = &pdev->dev;
	351	struct max8903_pdata *pdata = pdev->dev.platform_data;
	352	struct power_supply_config psy_cfg = {};
	353	int ret = 0;
	354
88a469bb	355	data = devm_kzalloc(dev, sizeof(struct max8903_data), GFP_KERNEL);
e6518a43	356	if (!data)
88a469bb	357	return -ENOMEM;
88a469bb	358
c5ed3307 CL	359	if (IS_ENABLED(CONFIG_OF) && !pdata && dev->of_node)
	360	pdata = max8903_parse_dt_data(dev);
	361
	362	if (!pdata) {
	363	dev_err(dev, "No platform data.\n");
	364	return -EINVAL;
	365	}
	366
	367	pdev->dev.platform_data = pdata;
	368	data->pdata = pdata;
88a469bb CL	369	data->dev = dev;
	370	platform_set_drvdata(pdev, data);
	371
	372	if (pdata->dc_valid == false && pdata->usb_valid == false) {
	373	dev_err(dev, "No valid power sources.\n");
	374	return -EINVAL;
	375	}
	376
	377	ret = max8903_setup_gpios(pdev);
	378	if (ret)
	379	return ret;
	380
297d716f	381	data->psy_desc.name = "max8903_charger";
88a469bb CL	382	data->psy_desc.type = (data->ta_in) ? POWER_SUPPLY_TYPE_MAINS :
88a469bb CL	383	((data->usb_in) ? POWER_SUPPLY_TYPE_USB :
b14a9ccc	384	POWER_SUPPLY_TYPE_BATTERY);
297d716f KK	385	data->psy_desc.get_property = max8903_get_property;
	386	data->psy_desc.properties = max8903_charger_props;
	387	data->psy_desc.num_properties = ARRAY_SIZE(max8903_charger_props);
b14a9ccc	388
c5ed3307	389	psy_cfg.of_node = dev->of_node;
297d716f KK	390	psy_cfg.drv_data = data;
297d716f KK	391
0df2deea	392	data->psy = devm_power_supply_register(dev, &data->psy_desc, &psy_cfg);
297d716f	393	if (IS_ERR(data->psy)) {
b14a9ccc	394	dev_err(dev, "failed: power supply register.\n");
0df2deea	395	return PTR_ERR(data->psy);
b14a9ccc MH	396	}
	397
	398	if (pdata->dc_valid) {
0df2deea	399	ret = devm_request_threaded_irq(dev, gpio_to_irq(pdata->dok),
d5fdfedc SS	400	NULL, max8903_dcin,
	401	IRQF_TRIGGER_FALLING \|
	402	IRQF_TRIGGER_RISING \| IRQF_ONESHOT,
	403	"MAX8903 DC IN", data);
b14a9ccc MH	404	if (ret) {
	405	dev_err(dev, "Cannot request irq %d for DC (%d)\n",
	406	gpio_to_irq(pdata->dok), ret);
0df2deea	407	return ret;
b14a9ccc MH	408	}
	409	}
	410
	411	if (pdata->usb_valid) {
0df2deea	412	ret = devm_request_threaded_irq(dev, gpio_to_irq(pdata->uok),
d5fdfedc SS	413	NULL, max8903_usbin,
	414	IRQF_TRIGGER_FALLING \|
	415	IRQF_TRIGGER_RISING \| IRQF_ONESHOT,
	416	"MAX8903 USB IN", data);
b14a9ccc MH	417	if (ret) {
	418	dev_err(dev, "Cannot request irq %d for USB (%d)\n",
	419	gpio_to_irq(pdata->uok), ret);
0df2deea	420	return ret;
b14a9ccc MH	421	}
	422	}
	423
3525e5c5	424	if (gpio_is_valid(pdata->flt)) {
0df2deea	425	ret = devm_request_threaded_irq(dev, gpio_to_irq(pdata->flt),
d5fdfedc SS	426	NULL, max8903_fault,
	427	IRQF_TRIGGER_FALLING \|
	428	IRQF_TRIGGER_RISING \| IRQF_ONESHOT,
	429	"MAX8903 Fault", data);
b14a9ccc MH	430	if (ret) {
	431	dev_err(dev, "Cannot request irq %d for Fault (%d)\n",
	432	gpio_to_irq(pdata->flt), ret);
0df2deea	433	return ret;
b14a9ccc MH	434	}
	435	}
	436
b14a9ccc MH	437	return 0;
	438	}
	439
c5ed3307 CL	440	static const struct of_device_id max8903_match_ids[] = {
	441	{ .compatible = "maxim,max8903", },
	442	{ /* sentinel */ }
	443	};
	444	MODULE_DEVICE_TABLE(of, max8903_match_ids);
	445
b14a9ccc MH	446	static struct platform_driver max8903_driver = {
b14a9ccc MH	447	.probe = max8903_probe,
b14a9ccc MH	448	.driver = {
b14a9ccc MH	449	.name = "max8903-charger",
c5ed3307	450	.of_match_table = max8903_match_ids
b14a9ccc MH	451	},
	452	};
	453
300bac7f	454	module_platform_driver(max8903_driver);
b14a9ccc MH	455
	456	MODULE_LICENSE("GPL");
	457	MODULE_DESCRIPTION("MAX8903 Charger Driver");
	458	MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
bd19c756	459	MODULE_ALIAS("platform:max8903-charger");