Initial import

1 files changed, 383 insertions, 0 deletions

diff --git a/drivers/power/max8903_charger.c b/drivers/power/max8903_charger.c
new file mode 100644
index 000000000..bf2b4b3a7
--- /dev/null
+++ b/drivers/power/max8903_charger.c
@@ -0,0 +1,383 @@
+/*
+ * 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");
+		ret = -EINVAL;
+		goto err;
+	}
+
+	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");
+			ret = -EINVAL;
+			goto err;
+		}
+	} else {
+		if (pdata->dcm) {
+			if (gpio_is_valid(pdata->dcm))
+				gpio_set_value(pdata->dcm, 0);
+			else {
+				dev_err(dev, "Invalid pin: dcm.\n");
+				ret = -EINVAL;
+				goto err;
+			}
+		}
+	}
+
+	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");
+			ret = -EINVAL;
+			goto err;
+		}
+	}
+
+	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");
+			ret = -EINVAL;
+			goto err;
+		}
+	}
+
+	if (pdata->chg) {
+		if (!gpio_is_valid(pdata->chg)) {
+			dev_err(dev, "Invalid pin: chg.\n");
+			ret = -EINVAL;
+			goto err;
+		}
+	}
+
+	if (pdata->flt) {
+		if (!gpio_is_valid(pdata->flt)) {
+			dev_err(dev, "Invalid pin: flt.\n");
+			ret = -EINVAL;
+			goto err;
+		}
+	}
+
+	if (pdata->usus) {
+		if (!gpio_is_valid(pdata->usus)) {
+			dev_err(dev, "Invalid pin: usus.\n");
+			ret = -EINVAL;
+			goto err;
+		}
+	}
+
+	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 = power_supply_register(dev, &data->psy_desc, &psy_cfg);
+	if (IS_ERR(data->psy)) {
+		dev_err(dev, "failed: power supply register.\n");
+		ret = PTR_ERR(data->psy);
+		goto err;
+	}
+
+	if (pdata->dc_valid) {
+		ret = request_threaded_irq(gpio_to_irq(pdata->dok),
+				NULL, max8903_dcin,
+				IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
+				"MAX8903 DC IN", data);
+		if (ret) {
+			dev_err(dev, "Cannot request irq %d for DC (%d)\n",
+					gpio_to_irq(pdata->dok), ret);
+			goto err_psy;
+		}
+	}
+
+	if (pdata->usb_valid) {
+		ret = request_threaded_irq(gpio_to_irq(pdata->uok),
+				NULL, max8903_usbin,
+				IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
+				"MAX8903 USB IN", data);
+		if (ret) {
+			dev_err(dev, "Cannot request irq %d for USB (%d)\n",
+					gpio_to_irq(pdata->uok), ret);
+			goto err_dc_irq;
+		}
+	}
+
+	if (pdata->flt) {
+		ret = request_threaded_irq(gpio_to_irq(pdata->flt),
+				NULL, max8903_fault,
+				IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
+				"MAX8903 Fault", data);
+		if (ret) {
+			dev_err(dev, "Cannot request irq %d for Fault (%d)\n",
+					gpio_to_irq(pdata->flt), ret);
+			goto err_usb_irq;
+		}
+	}
+
+	return 0;
+
+err_usb_irq:
+	if (pdata->usb_valid)
+		free_irq(gpio_to_irq(pdata->uok), data);
+err_dc_irq:
+	if (pdata->dc_valid)
+		free_irq(gpio_to_irq(pdata->dok), data);
+err_psy:
+	power_supply_unregister(data->psy);
+err:
+	return ret;
+}
+
+static int max8903_remove(struct platform_device *pdev)
+{
+	struct max8903_data *data = platform_get_drvdata(pdev);
+
+	if (data) {
+		struct max8903_pdata *pdata = &data->pdata;
+
+		if (pdata->flt)
+			free_irq(gpio_to_irq(pdata->flt), data);
+		if (pdata->usb_valid)
+			free_irq(gpio_to_irq(pdata->uok), data);
+		if (pdata->dc_valid)
+			free_irq(gpio_to_irq(pdata->dok), data);
+		power_supply_unregister(data->psy);
+	}
+
+	return 0;
+}
+
+static struct platform_driver max8903_driver = {
+	.probe	= max8903_probe,
+	.remove	= max8903_remove,
+	.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");