[linux-2.6-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/consumer.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/slab.h>
#include <linux/power_supply.h>
#include <linux/platform_device.h>

struct max8903_data {
	struct device *dev;
	struct power_supply *psy;
	struct power_supply_desc psy_desc;
	/*
	 * GPIOs
	 * chg, flt, dcm and usus are optional.
	 * dok or uok must be present.
	 * If dok is present, cen must be present.
	 */
	struct gpio_desc *cen; /* Charger Enable input */
	struct gpio_desc *dok; /* DC (Adapter) Power OK output */
	struct gpio_desc *uok; /* USB Power OK output */
	struct gpio_desc *chg; /* Charger status output */
	struct gpio_desc *flt; /* Fault output */
	struct gpio_desc *dcm; /* Current-Limit Mode input (1: DC, 2: USB) */
	struct gpio_desc *usus; /* USB Suspend Input (1: suspended) */
	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 (data->chg) {
			if (gpiod_get_value(data->chg))
				/* CHG asserted */
				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;
	bool ta_in;
	enum power_supply_type old_type;

	/*
	 * This means the line is asserted.
	 *
	 * The signal is active low, but the inversion is handled in the GPIO
	 * library as the line should be flagged GPIO_ACTIVE_LOW in the device
	 * tree.
	 */
	ta_in = gpiod_get_value(data->dok);

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

	data->ta_in = ta_in;

	/* Set Current-Limit-Mode 1:DC 0:USB */
	if (data->dcm)
		gpiod_set_value(data->dcm, ta_in);

	/* Charger Enable / Disable */
	if (data->cen) {
		int val;

		if (ta_in)
			/* Certainly enable if DOK is asserted */
			val = 1;
		else if (data->usb_in)
			/* Enable if the USB charger is enabled */
			val = 1;
		else
			/* Else default-disable */
			val = 0;

		gpiod_set_value(data->cen, val);
	}

	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;
	bool usb_in;
	enum power_supply_type old_type;

	/*
	 * This means the line is asserted.
	 *
	 * The signal is active low, but the inversion is handled in the GPIO
	 * library as the line should be flagged GPIO_ACTIVE_LOW in the device
	 * tree.
	 */
	usb_in = gpiod_get_value(data->uok);

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

	data->usb_in = usb_in;

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

	/* Charger Enable / Disable */
	if (data->cen) {
		int val;

		if (usb_in)
			/* Certainly enable if UOK is asserted */
			val = 1;
		else if (data->ta_in)
			/* Enable if the DC charger is enabled */
			val = 1;
		else
			/* Else default-disable */
			val = 0;

		gpiod_set_value(data->cen, val);
	}

	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;
	bool fault;

	/*
	 * This means the line is asserted.
	 *
	 * The signal is active low, but the inversion is handled in the GPIO
	 * library as the line should be flagged GPIO_ACTIVE_LOW in the device
	 * tree.
	 */
	fault = gpiod_get_value(data->flt);

	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 int max8903_setup_gpios(struct platform_device *pdev)
{
	struct max8903_data *data = platform_get_drvdata(pdev);
	struct device *dev = &pdev->dev;
	bool ta_in = false;
	bool usb_in = false;
	enum gpiod_flags flags;

	data->dok = devm_gpiod_get_optional(dev, "dok", GPIOD_IN);
	if (IS_ERR(data->dok))
		return dev_err_probe(dev, PTR_ERR(data->dok),
				     "failed to get DOK GPIO");
	if (data->dok) {
		gpiod_set_consumer_name(data->dok, data->psy_desc.name);
		/*
		 * The DC OK is pulled up to 1 and goes low when a charger
		 * is plugged in (active low) but in the device tree the
		 * line is marked as GPIO_ACTIVE_LOW so we get a 1 (asserted)
		 * here if the DC charger is plugged in.
		 */
		ta_in = gpiod_get_value(data->dok);
	}

	data->uok = devm_gpiod_get_optional(dev, "uok", GPIOD_IN);
	if (IS_ERR(data->uok))
		return dev_err_probe(dev, PTR_ERR(data->uok),
				     "failed to get UOK GPIO");
	if (data->uok) {
		gpiod_set_consumer_name(data->uok, data->psy_desc.name);
		/*
		 * The USB OK is pulled up to 1 and goes low when a USB charger
		 * is plugged in (active low) but in the device tree the
		 * line is marked as GPIO_ACTIVE_LOW so we get a 1 (asserted)
		 * here if the USB charger is plugged in.
		 */
		usb_in = gpiod_get_value(data->uok);
	}

	/* Either DC OK or USB OK must be provided */
	if (!data->dok && !data->uok) {
		dev_err(dev, "no valid power source\n");
		return -EINVAL;
	}

	/*
	 * If either charger is already connected at this point,
	 * assert the CEN line and enable charging from the start.
	 *
	 * The line is active low but also marked with GPIO_ACTIVE_LOW
	 * in the device tree, so when we assert the line with
	 * GPIOD_OUT_HIGH the line will be driven low.
	 */
	flags = (ta_in || usb_in) ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
	/*
	 * If DC OK is provided, Charger Enable CEN is compulsory
	 * so this is not optional here.
	 */
	data->cen = devm_gpiod_get(dev, "cen", flags);
	if (IS_ERR(data->cen))
		return dev_err_probe(dev, PTR_ERR(data->cen),
				     "failed to get CEN GPIO");
	gpiod_set_consumer_name(data->cen, data->psy_desc.name);

	/*
	 * If the DC charger is connected, then select it.
	 *
	 * The DCM line should be marked GPIO_ACTIVE_HIGH in the
	 * device tree. Driving it high will enable the DC charger
	 * input over the USB charger input.
	 */
	flags = ta_in ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
	data->dcm = devm_gpiod_get_optional(dev, "dcm", flags);
	if (IS_ERR(data->dcm))
		return dev_err_probe(dev, PTR_ERR(data->dcm),
				     "failed to get DCM GPIO");
	gpiod_set_consumer_name(data->dcm, data->psy_desc.name);

	data->chg = devm_gpiod_get_optional(dev, "chg", GPIOD_IN);
	if (IS_ERR(data->chg))
		return dev_err_probe(dev, PTR_ERR(data->chg),
				     "failed to get CHG GPIO");
	gpiod_set_consumer_name(data->chg, data->psy_desc.name);

	data->flt = devm_gpiod_get_optional(dev, "flt", GPIOD_IN);
	if (IS_ERR(data->flt))
		return dev_err_probe(dev, PTR_ERR(data->flt),
				     "failed to get FLT GPIO");
	gpiod_set_consumer_name(data->flt, data->psy_desc.name);

	data->usus = devm_gpiod_get_optional(dev, "usus", GPIOD_IN);
	if (IS_ERR(data->usus))
		return dev_err_probe(dev, PTR_ERR(data->usus),
				     "failed to get USUS GPIO");
	gpiod_set_consumer_name(data->usus, data->psy_desc.name);

	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 power_supply_config psy_cfg = {};
	int ret = 0;

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

	data->dev = dev;
	platform_set_drvdata(pdev, data);

	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 (data->dok) {
		ret = devm_request_threaded_irq(dev, gpiod_to_irq(data->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",
					gpiod_to_irq(data->dok), ret);
			return ret;
		}
	}

	if (data->uok) {
		ret = devm_request_threaded_irq(dev, gpiod_to_irq(data->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",
					gpiod_to_irq(data->uok), ret);
			return ret;
		}
	}

	if (data->flt) {
		ret = devm_request_threaded_irq(dev, gpiod_to_irq(data->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",
					gpiod_to_irq(data->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	*/
b14a9ccc MH	8
50da8d04	9	#include <linux/gpio/consumer.h>
b14a9ccc	10	#include <linux/interrupt.h>
7e6d62db	11	#include <linux/module.h>
c5ed3307	12	#include <linux/of.h>
b14a9ccc MH	13	#include <linux/slab.h>
	14	#include <linux/power_supply.h>
	15	#include <linux/platform_device.h>
3188677d	16
b14a9ccc	17	struct max8903_data {
b14a9ccc	18	struct device *dev;
297d716f KK	19	struct power_supply *psy;
297d716f KK	20	struct power_supply_desc psy_desc;
50da8d04 LW	21	/*
	22	* GPIOs
	23	* chg, flt, dcm and usus are optional.
	24	* dok or uok must be present.
	25	* If dok is present, cen must be present.
	26	*/
	27	struct gpio_desc cen; / Charger Enable input */
	28	struct gpio_desc dok; / DC (Adapter) Power OK output */
	29	struct gpio_desc uok; / USB Power OK output */
	30	struct gpio_desc chg; / Charger status output */
	31	struct gpio_desc flt; / Fault output */
	32	struct gpio_desc dcm; / Current-Limit Mode input (1: DC, 2: USB) */
	33	struct gpio_desc usus; / USB Suspend Input (1: suspended) */
b14a9ccc MH	34	bool fault;
	35	bool usb_in;
	36	bool ta_in;
	37	};
	38
	39	static enum power_supply_property max8903_charger_props[] = {
	40	POWER_SUPPLY_PROP_STATUS, /* Charger status output */
	41	POWER_SUPPLY_PROP_ONLINE, /* External power source */
	42	POWER_SUPPLY_PROP_HEALTH, /* Fault or OK */
	43	};
	44
	45	static int max8903_get_property(struct power_supply *psy,
	46	enum power_supply_property psp,
	47	union power_supply_propval *val)
	48	{
297d716f	49	struct max8903_data *data = power_supply_get_drvdata(psy);
b14a9ccc MH	50
	51	switch (psp) {
	52	case POWER_SUPPLY_PROP_STATUS:
	53	val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
50da8d04 LW	54	if (data->chg) {
	55	if (gpiod_get_value(data->chg))
	56	/* CHG asserted */
b14a9ccc MH	57	val->intval = POWER_SUPPLY_STATUS_CHARGING;
	58	else if (data->usb_in \|\| data->ta_in)
	59	val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
	60	else
	61	val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
	62	}
	63	break;
	64	case POWER_SUPPLY_PROP_ONLINE:
	65	val->intval = 0;
	66	if (data->usb_in \|\| data->ta_in)
	67	val->intval = 1;
	68	break;
	69	case POWER_SUPPLY_PROP_HEALTH:
	70	val->intval = POWER_SUPPLY_HEALTH_GOOD;
	71	if (data->fault)
	72	val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
	73	break;
	74	default:
	75	return -EINVAL;
	76	}
c5ed3307	77
b14a9ccc MH	78	return 0;
	79	}
	80
	81	static irqreturn_t max8903_dcin(int irq, void *_data)
	82	{
	83	struct max8903_data *data = _data;
b14a9ccc MH	84	bool ta_in;
	85	enum power_supply_type old_type;
	86
50da8d04 LW	87	/*
	88	* This means the line is asserted.
	89	*
	90	* The signal is active low, but the inversion is handled in the GPIO
	91	* library as the line should be flagged GPIO_ACTIVE_LOW in the device
	92	* tree.
	93	*/
	94	ta_in = gpiod_get_value(data->dok);
b14a9ccc MH	95
	96	if (ta_in == data->ta_in)
	97	return IRQ_HANDLED;
	98
	99	data->ta_in = ta_in;
	100
	101	/* Set Current-Limit-Mode 1:DC 0:USB */
50da8d04 LW	102	if (data->dcm)
	103	gpiod_set_value(data->dcm, ta_in);
	104
	105	/* Charger Enable / Disable */
	106	if (data->cen) {
	107	int val;
	108
	109	if (ta_in)
	110	/* Certainly enable if DOK is asserted */
	111	val = 1;
	112	else if (data->usb_in)
	113	/* Enable if the USB charger is enabled */
	114	val = 1;
	115	else
	116	/* Else default-disable */
	117	val = 0;
	118
	119	gpiod_set_value(data->cen, val);
	120	}
b14a9ccc MH	121
	122	dev_dbg(data->dev, "TA(DC-IN) Charger %s.\n", ta_in ?
	123	"Connected" : "Disconnected");
	124
297d716f	125	old_type = data->psy_desc.type;
b14a9ccc MH	126
b14a9ccc MH	127	if (data->ta_in)
297d716f	128	data->psy_desc.type = POWER_SUPPLY_TYPE_MAINS;
b14a9ccc	129	else if (data->usb_in)
297d716f	130	data->psy_desc.type = POWER_SUPPLY_TYPE_USB;
b14a9ccc	131	else
297d716f	132	data->psy_desc.type = POWER_SUPPLY_TYPE_BATTERY;
b14a9ccc	133
297d716f KK	134	if (old_type != data->psy_desc.type)
297d716f KK	135	power_supply_changed(data->psy);
b14a9ccc MH	136
	137	return IRQ_HANDLED;
	138	}
	139
	140	static irqreturn_t max8903_usbin(int irq, void *_data)
	141	{
	142	struct max8903_data *data = _data;
b14a9ccc MH	143	bool usb_in;
	144	enum power_supply_type old_type;
	145
50da8d04 LW	146	/*
	147	* This means the line is asserted.
	148	*
	149	* The signal is active low, but the inversion is handled in the GPIO
	150	* library as the line should be flagged GPIO_ACTIVE_LOW in the device
	151	* tree.
	152	*/
	153	usb_in = gpiod_get_value(data->uok);
b14a9ccc MH	154
	155	if (usb_in == data->usb_in)
	156	return IRQ_HANDLED;
	157
	158	data->usb_in = usb_in;
	159
	160	/* Do not touch Current-Limit-Mode */
	161
50da8d04 LW	162	/* Charger Enable / Disable */
	163	if (data->cen) {
	164	int val;
	165
	166	if (usb_in)
	167	/* Certainly enable if UOK is asserted */
	168	val = 1;
	169	else if (data->ta_in)
	170	/* Enable if the DC charger is enabled */
	171	val = 1;
	172	else
	173	/* Else default-disable */
	174	val = 0;
	175
	176	gpiod_set_value(data->cen, val);
	177	}
b14a9ccc MH	178
	179	dev_dbg(data->dev, "USB Charger %s.\n", usb_in ?
	180	"Connected" : "Disconnected");
	181
297d716f	182	old_type = data->psy_desc.type;
b14a9ccc MH	183
b14a9ccc MH	184	if (data->ta_in)
297d716f	185	data->psy_desc.type = POWER_SUPPLY_TYPE_MAINS;
b14a9ccc	186	else if (data->usb_in)
297d716f	187	data->psy_desc.type = POWER_SUPPLY_TYPE_USB;
b14a9ccc	188	else
297d716f	189	data->psy_desc.type = POWER_SUPPLY_TYPE_BATTERY;
b14a9ccc	190
297d716f KK	191	if (old_type != data->psy_desc.type)
297d716f KK	192	power_supply_changed(data->psy);
b14a9ccc MH	193
	194	return IRQ_HANDLED;
	195	}
	196
	197	static irqreturn_t max8903_fault(int irq, void *_data)
	198	{
	199	struct max8903_data *data = _data;
b14a9ccc MH	200	bool fault;
b14a9ccc MH	201
50da8d04 LW	202	/*
	203	* This means the line is asserted.
	204	*
	205	* The signal is active low, but the inversion is handled in the GPIO
	206	* library as the line should be flagged GPIO_ACTIVE_LOW in the device
	207	* tree.
	208	*/
	209	fault = gpiod_get_value(data->flt);
b14a9ccc MH	210
	211	if (fault == data->fault)
	212	return IRQ_HANDLED;
	213
	214	data->fault = fault;
	215
	216	if (fault)
	217	dev_err(data->dev, "Charger suffers a fault and stops.\n");
	218	else
	219	dev_err(data->dev, "Charger recovered from a fault.\n");
	220
	221	return IRQ_HANDLED;
	222	}
	223
88a469bb	224	static int max8903_setup_gpios(struct platform_device *pdev)
b14a9ccc	225	{
88a469bb	226	struct max8903_data *data = platform_get_drvdata(pdev);
b14a9ccc	227	struct device *dev = &pdev->dev;
50da8d04 LW	228	bool ta_in = false;
	229	bool usb_in = false;
	230	enum gpiod_flags flags;
	231
	232	data->dok = devm_gpiod_get_optional(dev, "dok", GPIOD_IN);
	233	if (IS_ERR(data->dok))
	234	return dev_err_probe(dev, PTR_ERR(data->dok),
	235	"failed to get DOK GPIO");
	236	if (data->dok) {
	237	gpiod_set_consumer_name(data->dok, data->psy_desc.name);
	238	/*
	239	* The DC OK is pulled up to 1 and goes low when a charger
	240	* is plugged in (active low) but in the device tree the
	241	* line is marked as GPIO_ACTIVE_LOW so we get a 1 (asserted)
	242	* here if the DC charger is plugged in.
	243	*/
	244	ta_in = gpiod_get_value(data->dok);
cbf9077e	245	}
b14a9ccc	246
50da8d04 LW	247	data->uok = devm_gpiod_get_optional(dev, "uok", GPIOD_IN);
	248	if (IS_ERR(data->uok))
	249	return dev_err_probe(dev, PTR_ERR(data->uok),
	250	"failed to get UOK GPIO");
	251	if (data->uok) {
	252	gpiod_set_consumer_name(data->uok, data->psy_desc.name);
	253	/*
	254	* The USB OK is pulled up to 1 and goes low when a USB charger
	255	* is plugged in (active low) but in the device tree the
	256	* line is marked as GPIO_ACTIVE_LOW so we get a 1 (asserted)
	257	* here if the USB charger is plugged in.
	258	*/
	259	usb_in = gpiod_get_value(data->uok);
b14a9ccc MH	260	}
b14a9ccc MH	261
50da8d04 LW	262	/* Either DC OK or USB OK must be provided */
	263	if (!data->dok && !data->uok) {
	264	dev_err(dev, "no valid power source\n");
	265	return -EINVAL;
b14a9ccc MH	266	}
b14a9ccc MH	267
50da8d04 LW	268	/*
	269	* If either charger is already connected at this point,
	270	* assert the CEN line and enable charging from the start.
	271	*
	272	* The line is active low but also marked with GPIO_ACTIVE_LOW
	273	* in the device tree, so when we assert the line with
	274	* GPIOD_OUT_HIGH the line will be driven low.
	275	*/
	276	flags = (ta_in \|\| usb_in) ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
	277	/*
	278	* If DC OK is provided, Charger Enable CEN is compulsory
	279	* so this is not optional here.
	280	*/
	281	data->cen = devm_gpiod_get(dev, "cen", flags);
	282	if (IS_ERR(data->cen))
	283	return dev_err_probe(dev, PTR_ERR(data->cen),
	284	"failed to get CEN GPIO");
	285	gpiod_set_consumer_name(data->cen, data->psy_desc.name);
b14a9ccc	286
50da8d04 LW	287	/*
	288	* If the DC charger is connected, then select it.
	289	*
	290	* The DCM line should be marked GPIO_ACTIVE_HIGH in the
	291	* device tree. Driving it high will enable the DC charger
	292	* input over the USB charger input.
	293	*/
	294	flags = ta_in ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
	295	data->dcm = devm_gpiod_get_optional(dev, "dcm", flags);
	296	if (IS_ERR(data->dcm))
	297	return dev_err_probe(dev, PTR_ERR(data->dcm),
	298	"failed to get DCM GPIO");
	299	gpiod_set_consumer_name(data->dcm, data->psy_desc.name);
	300
	301	data->chg = devm_gpiod_get_optional(dev, "chg", GPIOD_IN);
	302	if (IS_ERR(data->chg))
	303	return dev_err_probe(dev, PTR_ERR(data->chg),
	304	"failed to get CHG GPIO");
	305	gpiod_set_consumer_name(data->chg, data->psy_desc.name);
	306
	307	data->flt = devm_gpiod_get_optional(dev, "flt", GPIOD_IN);
	308	if (IS_ERR(data->flt))
	309	return dev_err_probe(dev, PTR_ERR(data->flt),
	310	"failed to get FLT GPIO");
	311	gpiod_set_consumer_name(data->flt, data->psy_desc.name);
	312
	313	data->usus = devm_gpiod_get_optional(dev, "usus", GPIOD_IN);
	314	if (IS_ERR(data->usus))
	315	return dev_err_probe(dev, PTR_ERR(data->usus),
	316	"failed to get USUS GPIO");
	317	gpiod_set_consumer_name(data->usus, data->psy_desc.name);
b14a9ccc MH	318
	319	data->fault = false;
	320	data->ta_in = ta_in;
	321	data->usb_in = usb_in;
	322
88a469bb CL	323	return 0;
	324	}
	325
	326	static int max8903_probe(struct platform_device *pdev)
	327	{
	328	struct max8903_data *data;
	329	struct device *dev = &pdev->dev;
88a469bb CL	330	struct power_supply_config psy_cfg = {};
	331	int ret = 0;
	332
88a469bb	333	data = devm_kzalloc(dev, sizeof(struct max8903_data), GFP_KERNEL);
e6518a43	334	if (!data)
88a469bb	335	return -ENOMEM;
88a469bb	336
88a469bb CL	337	data->dev = dev;
	338	platform_set_drvdata(pdev, data);
	339
88a469bb CL	340	ret = max8903_setup_gpios(pdev);
	341	if (ret)
	342	return ret;
	343
297d716f	344	data->psy_desc.name = "max8903_charger";
88a469bb CL	345	data->psy_desc.type = (data->ta_in) ? POWER_SUPPLY_TYPE_MAINS :
88a469bb CL	346	((data->usb_in) ? POWER_SUPPLY_TYPE_USB :
b14a9ccc	347	POWER_SUPPLY_TYPE_BATTERY);
297d716f KK	348	data->psy_desc.get_property = max8903_get_property;
	349	data->psy_desc.properties = max8903_charger_props;
	350	data->psy_desc.num_properties = ARRAY_SIZE(max8903_charger_props);
b14a9ccc	351
c5ed3307	352	psy_cfg.of_node = dev->of_node;
297d716f KK	353	psy_cfg.drv_data = data;
297d716f KK	354
0df2deea	355	data->psy = devm_power_supply_register(dev, &data->psy_desc, &psy_cfg);
297d716f	356	if (IS_ERR(data->psy)) {
b14a9ccc	357	dev_err(dev, "failed: power supply register.\n");
0df2deea	358	return PTR_ERR(data->psy);
b14a9ccc MH	359	}
b14a9ccc MH	360
50da8d04 LW	361	if (data->dok) {
50da8d04 LW	362	ret = devm_request_threaded_irq(dev, gpiod_to_irq(data->dok),
d5fdfedc SS	363	NULL, max8903_dcin,
	364	IRQF_TRIGGER_FALLING \|
	365	IRQF_TRIGGER_RISING \| IRQF_ONESHOT,
	366	"MAX8903 DC IN", data);
b14a9ccc MH	367	if (ret) {
b14a9ccc MH	368	dev_err(dev, "Cannot request irq %d for DC (%d)\n",
50da8d04	369	gpiod_to_irq(data->dok), ret);
0df2deea	370	return ret;
b14a9ccc MH	371	}
	372	}
	373
50da8d04 LW	374	if (data->uok) {
50da8d04 LW	375	ret = devm_request_threaded_irq(dev, gpiod_to_irq(data->uok),
d5fdfedc SS	376	NULL, max8903_usbin,
	377	IRQF_TRIGGER_FALLING \|
	378	IRQF_TRIGGER_RISING \| IRQF_ONESHOT,
	379	"MAX8903 USB IN", data);
b14a9ccc MH	380	if (ret) {
b14a9ccc MH	381	dev_err(dev, "Cannot request irq %d for USB (%d)\n",
50da8d04	382	gpiod_to_irq(data->uok), ret);
0df2deea	383	return ret;
b14a9ccc MH	384	}
	385	}
	386
50da8d04 LW	387	if (data->flt) {
50da8d04 LW	388	ret = devm_request_threaded_irq(dev, gpiod_to_irq(data->flt),
d5fdfedc SS	389	NULL, max8903_fault,
	390	IRQF_TRIGGER_FALLING \|
	391	IRQF_TRIGGER_RISING \| IRQF_ONESHOT,
	392	"MAX8903 Fault", data);
b14a9ccc MH	393	if (ret) {
b14a9ccc MH	394	dev_err(dev, "Cannot request irq %d for Fault (%d)\n",
50da8d04	395	gpiod_to_irq(data->flt), ret);
0df2deea	396	return ret;
b14a9ccc MH	397	}
	398	}
	399
b14a9ccc MH	400	return 0;
	401	}
	402
c5ed3307 CL	403	static const struct of_device_id max8903_match_ids[] = {
	404	{ .compatible = "maxim,max8903", },
	405	{ /* sentinel */ }
	406	};
	407	MODULE_DEVICE_TABLE(of, max8903_match_ids);
	408
b14a9ccc MH	409	static struct platform_driver max8903_driver = {
b14a9ccc MH	410	.probe = max8903_probe,
b14a9ccc MH	411	.driver = {
b14a9ccc MH	412	.name = "max8903-charger",
c5ed3307	413	.of_match_table = max8903_match_ids
b14a9ccc MH	414	},
	415	};
	416
300bac7f	417	module_platform_driver(max8903_driver);
b14a9ccc MH	418
	419	MODULE_LICENSE("GPL");
	420	MODULE_DESCRIPTION("MAX8903 Charger Driver");
	421	MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
bd19c756	422	MODULE_ALIAS("platform:max8903-charger");