[linux-block.git] / drivers / power / supply / max8903_charger.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * max8903_charger.c - Maxim 8903 USB/Adapter Charger Driver
 *
 * Copyright (C) 2011 Samsung Electronics
 * MyungJoo Ham <myungjoo.ham@samsung.com>
 */

#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
1a59d1b8	1	// SPDX-License-Identifier: GPL-2.0-or-later
b14a9ccc MH	2	/*
	3	* max8903_charger.c - Maxim 8903 USB/Adapter Charger Driver
	4	*
	5	* Copyright (C) 2011 Samsung Electronics
	6	* MyungJoo Ham <myungjoo.ham@samsung.com>
b14a9ccc MH	7	*/
	8
	9	#include <linux/gpio.h>
	10	#include <linux/interrupt.h>
7e6d62db	11	#include <linux/module.h>
c5ed3307 CL	12	#include <linux/of.h>
	13	#include <linux/of_device.h>
	14	#include <linux/of_gpio.h>
b14a9ccc MH	15	#include <linux/slab.h>
	16	#include <linux/power_supply.h>
	17	#include <linux/platform_device.h>
	18	#include <linux/power/max8903_charger.h>
	19
	20	struct max8903_data {
0c3ae04b	21	struct max8903_pdata *pdata;
b14a9ccc	22	struct device *dev;
297d716f KK	23	struct power_supply *psy;
297d716f KK	24	struct power_supply_desc psy_desc;
b14a9ccc MH	25	bool fault;
	26	bool usb_in;
	27	bool ta_in;
	28	};
	29
	30	static enum power_supply_property max8903_charger_props[] = {
	31	POWER_SUPPLY_PROP_STATUS, /* Charger status output */
	32	POWER_SUPPLY_PROP_ONLINE, /* External power source */
	33	POWER_SUPPLY_PROP_HEALTH, /* Fault or OK */
	34	};
	35
	36	static int max8903_get_property(struct power_supply *psy,
	37	enum power_supply_property psp,
	38	union power_supply_propval *val)
	39	{
297d716f	40	struct max8903_data *data = power_supply_get_drvdata(psy);
b14a9ccc MH	41
	42	switch (psp) {
	43	case POWER_SUPPLY_PROP_STATUS:
	44	val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
3525e5c5	45	if (gpio_is_valid(data->pdata->chg)) {
0c3ae04b	46	if (gpio_get_value(data->pdata->chg) == 0)
b14a9ccc MH	47	val->intval = POWER_SUPPLY_STATUS_CHARGING;
	48	else if (data->usb_in \|\| data->ta_in)
	49	val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
	50	else
	51	val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
	52	}
	53	break;
	54	case POWER_SUPPLY_PROP_ONLINE:
	55	val->intval = 0;
	56	if (data->usb_in \|\| data->ta_in)
	57	val->intval = 1;
	58	break;
	59	case POWER_SUPPLY_PROP_HEALTH:
	60	val->intval = POWER_SUPPLY_HEALTH_GOOD;
	61	if (data->fault)
	62	val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
	63	break;
	64	default:
	65	return -EINVAL;
	66	}
c5ed3307	67
b14a9ccc MH	68	return 0;
	69	}
	70
	71	static irqreturn_t max8903_dcin(int irq, void *_data)
	72	{
	73	struct max8903_data *data = _data;
0c3ae04b	74	struct max8903_pdata *pdata = data->pdata;
b14a9ccc MH	75	bool ta_in;
	76	enum power_supply_type old_type;
	77
	78	ta_in = gpio_get_value(pdata->dok) ? false : true;
	79
	80	if (ta_in == data->ta_in)
	81	return IRQ_HANDLED;
	82
	83	data->ta_in = ta_in;
	84
	85	/* Set Current-Limit-Mode 1:DC 0:USB */
3525e5c5	86	if (gpio_is_valid(pdata->dcm))
b14a9ccc MH	87	gpio_set_value(pdata->dcm, ta_in ? 1 : 0);
	88
	89	/* Charger Enable / Disable (cen is negated) */
3525e5c5	90	if (gpio_is_valid(pdata->cen))
b14a9ccc MH	91	gpio_set_value(pdata->cen, ta_in ? 0 :
	92	(data->usb_in ? 0 : 1));
	93
	94	dev_dbg(data->dev, "TA(DC-IN) Charger %s.\n", ta_in ?
	95	"Connected" : "Disconnected");
	96
297d716f	97	old_type = data->psy_desc.type;
b14a9ccc MH	98
b14a9ccc MH	99	if (data->ta_in)
297d716f	100	data->psy_desc.type = POWER_SUPPLY_TYPE_MAINS;
b14a9ccc	101	else if (data->usb_in)
297d716f	102	data->psy_desc.type = POWER_SUPPLY_TYPE_USB;
b14a9ccc	103	else
297d716f	104	data->psy_desc.type = POWER_SUPPLY_TYPE_BATTERY;
b14a9ccc	105
297d716f KK	106	if (old_type != data->psy_desc.type)
297d716f KK	107	power_supply_changed(data->psy);
b14a9ccc MH	108
	109	return IRQ_HANDLED;
	110	}
	111
	112	static irqreturn_t max8903_usbin(int irq, void *_data)
	113	{
	114	struct max8903_data *data = _data;
0c3ae04b	115	struct max8903_pdata *pdata = data->pdata;
b14a9ccc MH	116	bool usb_in;
	117	enum power_supply_type old_type;
	118
	119	usb_in = gpio_get_value(pdata->uok) ? false : true;
	120
	121	if (usb_in == data->usb_in)
	122	return IRQ_HANDLED;
	123
	124	data->usb_in = usb_in;
	125
	126	/* Do not touch Current-Limit-Mode */
	127
	128	/* Charger Enable / Disable (cen is negated) */
3525e5c5	129	if (gpio_is_valid(pdata->cen))
b14a9ccc MH	130	gpio_set_value(pdata->cen, usb_in ? 0 :
	131	(data->ta_in ? 0 : 1));
	132
	133	dev_dbg(data->dev, "USB Charger %s.\n", usb_in ?
	134	"Connected" : "Disconnected");
	135
297d716f	136	old_type = data->psy_desc.type;
b14a9ccc MH	137
b14a9ccc MH	138	if (data->ta_in)
297d716f	139	data->psy_desc.type = POWER_SUPPLY_TYPE_MAINS;
b14a9ccc	140	else if (data->usb_in)
297d716f	141	data->psy_desc.type = POWER_SUPPLY_TYPE_USB;
b14a9ccc	142	else
297d716f	143	data->psy_desc.type = POWER_SUPPLY_TYPE_BATTERY;
b14a9ccc	144
297d716f KK	145	if (old_type != data->psy_desc.type)
297d716f KK	146	power_supply_changed(data->psy);
b14a9ccc MH	147
	148	return IRQ_HANDLED;
	149	}
	150
	151	static irqreturn_t max8903_fault(int irq, void *_data)
	152	{
	153	struct max8903_data *data = _data;
0c3ae04b	154	struct max8903_pdata *pdata = data->pdata;
b14a9ccc MH	155	bool fault;
	156
	157	fault = gpio_get_value(pdata->flt) ? false : true;
	158
	159	if (fault == data->fault)
	160	return IRQ_HANDLED;
	161
	162	data->fault = fault;
	163
	164	if (fault)
	165	dev_err(data->dev, "Charger suffers a fault and stops.\n");
	166	else
	167	dev_err(data->dev, "Charger recovered from a fault.\n");
	168
	169	return IRQ_HANDLED;
	170	}
	171
c5ed3307 CL	172	static struct max8903_pdata max8903_parse_dt_data(struct device dev)
	173	{
	174	struct device_node *np = dev->of_node;
	175	struct max8903_pdata *pdata = NULL;
	176
	177	if (!np)
	178	return NULL;
	179
	180	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	181	if (!pdata)
	182	return NULL;
	183
	184	pdata->dc_valid = false;
	185	pdata->usb_valid = false;
	186
	187	pdata->cen = of_get_named_gpio(np, "cen-gpios", 0);
	188	if (!gpio_is_valid(pdata->cen))
	189	pdata->cen = -EINVAL;
	190
	191	pdata->chg = of_get_named_gpio(np, "chg-gpios", 0);
	192	if (!gpio_is_valid(pdata->chg))
	193	pdata->chg = -EINVAL;
	194
	195	pdata->flt = of_get_named_gpio(np, "flt-gpios", 0);
	196	if (!gpio_is_valid(pdata->flt))
	197	pdata->flt = -EINVAL;
	198
	199	pdata->usus = of_get_named_gpio(np, "usus-gpios", 0);
	200	if (!gpio_is_valid(pdata->usus))
	201	pdata->usus = -EINVAL;
	202
	203	pdata->dcm = of_get_named_gpio(np, "dcm-gpios", 0);
	204	if (!gpio_is_valid(pdata->dcm))
	205	pdata->dcm = -EINVAL;
	206
	207	pdata->dok = of_get_named_gpio(np, "dok-gpios", 0);
	208	if (!gpio_is_valid(pdata->dok))
	209	pdata->dok = -EINVAL;
	210	else
	211	pdata->dc_valid = true;
	212
	213	pdata->uok = of_get_named_gpio(np, "uok-gpios", 0);
	214	if (!gpio_is_valid(pdata->uok))
	215	pdata->uok = -EINVAL;
	216	else
	217	pdata->usb_valid = true;
	218
	219	return pdata;
	220	}
	221
88a469bb	222	static int max8903_setup_gpios(struct platform_device *pdev)
b14a9ccc	223	{
88a469bb	224	struct max8903_data *data = platform_get_drvdata(pdev);
b14a9ccc MH	225	struct device *dev = &pdev->dev;
	226	struct max8903_pdata *pdata = pdev->dev.platform_data;
	227	int ret = 0;
	228	int gpio;
	229	int ta_in = 0;
	230	int usb_in = 0;
	231
b14a9ccc	232	if (pdata->dc_valid) {
3525e5c5	233	if (gpio_is_valid(pdata->dok)) {
88a469bb CL	234	ret = devm_gpio_request(dev, pdata->dok,
	235	data->psy_desc.name);
	236	if (ret) {
	237	dev_err(dev,
	238	"Failed GPIO request for dok: %d err %d\n",
	239	pdata->dok, ret);
	240	return ret;
	241	}
	242
b14a9ccc MH	243	gpio = pdata->dok; /* PULL_UPed Interrupt */
b14a9ccc MH	244	ta_in = gpio_get_value(gpio) ? 0 : 1;
cbf9077e CL	245	} else {
	246	dev_err(dev, "When DC is wired, DOK should be wired as well.\n");
	247	return -EINVAL;
	248	}
	249	}
b14a9ccc	250
3525e5c5 CL	251	if (gpio_is_valid(pdata->dcm)) {
	252	ret = devm_gpio_request(dev, pdata->dcm, data->psy_desc.name);
	253	if (ret) {
	254	dev_err(dev,
	255	"Failed GPIO request for dcm: %d err %d\n",
	256	pdata->dcm, ret);
	257	return ret;
b14a9ccc	258	}
3525e5c5 CL	259
	260	gpio = pdata->dcm; /* Output */
	261	gpio_set_value(gpio, ta_in);
b14a9ccc MH	262	}
	263
	264	if (pdata->usb_valid) {
3525e5c5	265	if (gpio_is_valid(pdata->uok)) {
88a469bb CL	266	ret = devm_gpio_request(dev, pdata->uok,
	267	data->psy_desc.name);
	268	if (ret) {
	269	dev_err(dev,
	270	"Failed GPIO request for uok: %d err %d\n",
	271	pdata->uok, ret);
	272	return ret;
	273	}
	274
b14a9ccc MH	275	gpio = pdata->uok;
	276	usb_in = gpio_get_value(gpio) ? 0 : 1;
	277	} else {
	278	dev_err(dev, "When USB is wired, UOK should be wired."
	279	"as well.\n");
0df2deea	280	return -EINVAL;
b14a9ccc MH	281	}
	282	}
	283
3525e5c5 CL	284	if (gpio_is_valid(pdata->cen)) {
	285	ret = devm_gpio_request(dev, pdata->cen, data->psy_desc.name);
	286	if (ret) {
	287	dev_err(dev,
	288	"Failed GPIO request for cen: %d err %d\n",
	289	pdata->cen, ret);
	290	return ret;
b14a9ccc	291	}
3525e5c5 CL	292
3525e5c5 CL	293	gpio_set_value(pdata->cen, (ta_in \|\| usb_in) ? 0 : 1);
b14a9ccc MH	294	}
b14a9ccc MH	295
3525e5c5 CL	296	if (gpio_is_valid(pdata->chg)) {
	297	ret = devm_gpio_request(dev, pdata->chg, data->psy_desc.name);
	298	if (ret) {
	299	dev_err(dev,
	300	"Failed GPIO request for chg: %d err %d\n",
	301	pdata->chg, ret);
	302	return ret;
b14a9ccc MH	303	}
	304	}
	305
3525e5c5 CL	306	if (gpio_is_valid(pdata->flt)) {
	307	ret = devm_gpio_request(dev, pdata->flt, data->psy_desc.name);
	308	if (ret) {
	309	dev_err(dev,
	310	"Failed GPIO request for flt: %d err %d\n",
	311	pdata->flt, ret);
	312	return ret;
b14a9ccc MH	313	}
	314	}
	315
3525e5c5 CL	316	if (gpio_is_valid(pdata->usus)) {
	317	ret = devm_gpio_request(dev, pdata->usus, data->psy_desc.name);
	318	if (ret) {
	319	dev_err(dev,
	320	"Failed GPIO request for usus: %d err %d\n",
	321	pdata->usus, ret);
	322	return ret;
b14a9ccc MH	323	}
	324	}
	325
	326	data->fault = false;
	327	data->ta_in = ta_in;
	328	data->usb_in = usb_in;
	329
88a469bb CL	330	return 0;
	331	}
	332
	333	static int max8903_probe(struct platform_device *pdev)
	334	{
	335	struct max8903_data *data;
	336	struct device *dev = &pdev->dev;
	337	struct max8903_pdata *pdata = pdev->dev.platform_data;
	338	struct power_supply_config psy_cfg = {};
	339	int ret = 0;
	340
88a469bb	341	data = devm_kzalloc(dev, sizeof(struct max8903_data), GFP_KERNEL);
e6518a43	342	if (!data)
88a469bb	343	return -ENOMEM;
88a469bb	344
c5ed3307 CL	345	if (IS_ENABLED(CONFIG_OF) && !pdata && dev->of_node)
	346	pdata = max8903_parse_dt_data(dev);
	347
	348	if (!pdata) {
	349	dev_err(dev, "No platform data.\n");
	350	return -EINVAL;
	351	}
	352
	353	pdev->dev.platform_data = pdata;
	354	data->pdata = pdata;
88a469bb CL	355	data->dev = dev;
	356	platform_set_drvdata(pdev, data);
	357
	358	if (pdata->dc_valid == false && pdata->usb_valid == false) {
	359	dev_err(dev, "No valid power sources.\n");
	360	return -EINVAL;
	361	}
	362
	363	ret = max8903_setup_gpios(pdev);
	364	if (ret)
	365	return ret;
	366
297d716f	367	data->psy_desc.name = "max8903_charger";
88a469bb CL	368	data->psy_desc.type = (data->ta_in) ? POWER_SUPPLY_TYPE_MAINS :
88a469bb CL	369	((data->usb_in) ? POWER_SUPPLY_TYPE_USB :
b14a9ccc	370	POWER_SUPPLY_TYPE_BATTERY);
297d716f KK	371	data->psy_desc.get_property = max8903_get_property;
	372	data->psy_desc.properties = max8903_charger_props;
	373	data->psy_desc.num_properties = ARRAY_SIZE(max8903_charger_props);
b14a9ccc	374
c5ed3307	375	psy_cfg.of_node = dev->of_node;
297d716f KK	376	psy_cfg.drv_data = data;
297d716f KK	377
0df2deea	378	data->psy = devm_power_supply_register(dev, &data->psy_desc, &psy_cfg);
297d716f	379	if (IS_ERR(data->psy)) {
b14a9ccc	380	dev_err(dev, "failed: power supply register.\n");
0df2deea	381	return PTR_ERR(data->psy);
b14a9ccc MH	382	}
	383
	384	if (pdata->dc_valid) {
0df2deea	385	ret = devm_request_threaded_irq(dev, gpio_to_irq(pdata->dok),
d5fdfedc SS	386	NULL, max8903_dcin,
	387	IRQF_TRIGGER_FALLING \|
	388	IRQF_TRIGGER_RISING \| IRQF_ONESHOT,
	389	"MAX8903 DC IN", data);
b14a9ccc MH	390	if (ret) {
	391	dev_err(dev, "Cannot request irq %d for DC (%d)\n",
	392	gpio_to_irq(pdata->dok), ret);
0df2deea	393	return ret;
b14a9ccc MH	394	}
	395	}
	396
	397	if (pdata->usb_valid) {
0df2deea	398	ret = devm_request_threaded_irq(dev, gpio_to_irq(pdata->uok),
d5fdfedc SS	399	NULL, max8903_usbin,
	400	IRQF_TRIGGER_FALLING \|
	401	IRQF_TRIGGER_RISING \| IRQF_ONESHOT,
	402	"MAX8903 USB IN", data);
b14a9ccc MH	403	if (ret) {
	404	dev_err(dev, "Cannot request irq %d for USB (%d)\n",
	405	gpio_to_irq(pdata->uok), ret);
0df2deea	406	return ret;
b14a9ccc MH	407	}
	408	}
	409
3525e5c5	410	if (gpio_is_valid(pdata->flt)) {
0df2deea	411	ret = devm_request_threaded_irq(dev, gpio_to_irq(pdata->flt),
d5fdfedc SS	412	NULL, max8903_fault,
	413	IRQF_TRIGGER_FALLING \|
	414	IRQF_TRIGGER_RISING \| IRQF_ONESHOT,
	415	"MAX8903 Fault", data);
b14a9ccc MH	416	if (ret) {
	417	dev_err(dev, "Cannot request irq %d for Fault (%d)\n",
	418	gpio_to_irq(pdata->flt), ret);
0df2deea	419	return ret;
b14a9ccc MH	420	}
	421	}
	422
b14a9ccc MH	423	return 0;
	424	}
	425
c5ed3307 CL	426	static const struct of_device_id max8903_match_ids[] = {
	427	{ .compatible = "maxim,max8903", },
	428	{ /* sentinel */ }
	429	};
	430	MODULE_DEVICE_TABLE(of, max8903_match_ids);
	431
b14a9ccc MH	432	static struct platform_driver max8903_driver = {
b14a9ccc MH	433	.probe = max8903_probe,
b14a9ccc MH	434	.driver = {
b14a9ccc MH	435	.name = "max8903-charger",
c5ed3307	436	.of_match_table = max8903_match_ids
b14a9ccc MH	437	},
	438	};
	439
300bac7f	440	module_platform_driver(max8903_driver);
b14a9ccc MH	441
	442	MODULE_LICENSE("GPL");
	443	MODULE_DESCRIPTION("MAX8903 Charger Driver");
	444	MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
bd19c756	445	MODULE_ALIAS("platform:max8903-charger");