drivers/power/max8903_charger.c - pub/scm/linux/kernel/git/kishon/linux-phy - Git at Google

 /*
  * 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/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 (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 (pdata->dcm)
 		gpio_set_value(pdata->dcm, ta_in ? 1 : 0);

 	/* Charger Enable / Disable (cen is negated) */
 	if (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 (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 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;
 	int gpio;
 	int ta_in = 0;
 	int usb_in = 0;

 	data = devm_kzalloc(dev, sizeof(struct max8903_data), GFP_KERNEL);
 	if (data == NULL) {
 		dev_err(dev, "Cannot allocate memory.\n");
 		return -ENOMEM;
 	}
 	memcpy(&data->pdata, pdata, sizeof(struct max8903_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;
 	}

 	if (pdata->dc_valid) {
 		if (pdata->dok && gpio_is_valid(pdata->dok) &&
 				pdata->dcm && gpio_is_valid(pdata->dcm)) {
 			gpio = pdata->dok; /* PULL_UPed Interrupt */
 			ta_in = gpio_get_value(gpio) ? 0 : 1;

 			gpio = pdata->dcm; /* Output */
 			gpio_set_value(gpio, ta_in);
 		} else {
 			dev_err(dev, "When DC is wired, DOK and DCM should"
 					" be wired as well.\n");
 			return -EINVAL;
 		}
 	} else {
 		if (pdata->dcm) {
 			if (gpio_is_valid(pdata->dcm))
 				gpio_set_value(pdata->dcm, 0);
 			else {
 				dev_err(dev, "Invalid pin: dcm.\n");
 				return -EINVAL;
 			}
 		}
 	}

 	if (pdata->usb_valid) {
 		if (pdata->uok && gpio_is_valid(pdata->uok)) {
 			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 (pdata->cen) {
 		if (gpio_is_valid(pdata->cen)) {
 			gpio_set_value(pdata->cen, (ta_in || usb_in) ? 0 : 1);
 		} else {
 			dev_err(dev, "Invalid pin: cen.\n");
 			return -EINVAL;
 		}
 	}

 	if (pdata->chg) {
 		if (!gpio_is_valid(pdata->chg)) {
 			dev_err(dev, "Invalid pin: chg.\n");
 			return -EINVAL;
 		}
 	}

 	if (pdata->flt) {
 		if (!gpio_is_valid(pdata->flt)) {
 			dev_err(dev, "Invalid pin: flt.\n");
 			return -EINVAL;
 		}
 	}

 	if (pdata->usus) {
 		if (!gpio_is_valid(pdata->usus)) {
 			dev_err(dev, "Invalid pin: usus.\n");
 			return -EINVAL;
 		}
 	}

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

 	data->psy_desc.name = "max8903_charger";
 	data->psy_desc.type = (ta_in) ? POWER_SUPPLY_TYPE_MAINS :
 			((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.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 (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 struct platform_driver max8903_driver = {
 	.probe	= max8903_probe,
 	.driver = {
 		.name	= "max8903-charger",
 	},
 };

 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");
	/*
	* 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/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 (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 (pdata->dcm)
	gpio_set_value(pdata->dcm, ta_in ? 1 : 0);

	/* Charger Enable / Disable (cen is negated) */
	if (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 (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 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;
	int gpio;
	int ta_in = 0;
	int usb_in = 0;

	data = devm_kzalloc(dev, sizeof(struct max8903_data), GFP_KERNEL);
	if (data == NULL) {
	dev_err(dev, "Cannot allocate memory.\n");
	return -ENOMEM;
	}
	memcpy(&data->pdata, pdata, sizeof(struct max8903_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;
	}

	if (pdata->dc_valid) {
	if (pdata->dok && gpio_is_valid(pdata->dok) &&
	pdata->dcm && gpio_is_valid(pdata->dcm)) {
	gpio = pdata->dok; /* PULL_UPed Interrupt */
	ta_in = gpio_get_value(gpio) ? 0 : 1;

	gpio = pdata->dcm; /* Output */
	gpio_set_value(gpio, ta_in);
	} else {
	dev_err(dev, "When DC is wired, DOK and DCM should"
	" be wired as well.\n");
	return -EINVAL;
	}
	} else {
	if (pdata->dcm) {
	if (gpio_is_valid(pdata->dcm))
	gpio_set_value(pdata->dcm, 0);
	else {
	dev_err(dev, "Invalid pin: dcm.\n");
	return -EINVAL;
	}
	}
	}

	if (pdata->usb_valid) {
	if (pdata->uok && gpio_is_valid(pdata->uok)) {
	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 (pdata->cen) {
	if (gpio_is_valid(pdata->cen)) {
	gpio_set_value(pdata->cen, (ta_in \|\| usb_in) ? 0 : 1);
	} else {
	dev_err(dev, "Invalid pin: cen.\n");
	return -EINVAL;
	}
	}

	if (pdata->chg) {
	if (!gpio_is_valid(pdata->chg)) {
	dev_err(dev, "Invalid pin: chg.\n");
	return -EINVAL;
	}
	}

	if (pdata->flt) {
	if (!gpio_is_valid(pdata->flt)) {
	dev_err(dev, "Invalid pin: flt.\n");
	return -EINVAL;
	}
	}

	if (pdata->usus) {
	if (!gpio_is_valid(pdata->usus)) {
	dev_err(dev, "Invalid pin: usus.\n");
	return -EINVAL;
	}
	}

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

	data->psy_desc.name = "max8903_charger";
	data->psy_desc.type = (ta_in) ? POWER_SUPPLY_TYPE_MAINS :
	((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.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 (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 struct platform_driver max8903_driver = {
	.probe = max8903_probe,
	.driver = {
	.name = "max8903-charger",
	},
	};

	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");