drivers/power/goldfish_battery.c - kernel/quantenna - Git at Google

 /*
  * Power supply driver for the goldfish emulator
  *
  * Copyright (C) 2008 Google, Inc.
  * Copyright (C) 2012 Intel, Inc.
  * Copyright (C) 2013 Intel, Inc.
  * Author: Mike Lockwood <lockwood@android.com>
  *
  * This software is licensed under the terms of the GNU General Public
  * License version 2, as published by the Free Software Foundation, and
  * may be copied, distributed, and modified under those terms.
  *
  * 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.
  */

 #include <linux/module.h>
 #include <linux/err.h>
 #include <linux/platform_device.h>
 #include <linux/power_supply.h>
 #include <linux/types.h>
 #include <linux/pci.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/acpi.h>

 struct goldfish_battery_data {
 	void __iomem *reg_base;
 	int irq;
 	spinlock_t lock;

 	struct power_supply *battery;
 	struct power_supply *ac;
 };

 #define GOLDFISH_BATTERY_READ(data, addr) \
 	(readl(data->reg_base + addr))
 #define GOLDFISH_BATTERY_WRITE(data, addr, x) \
 	(writel(x, data->reg_base + addr))

 /*
  * Temporary variable used between goldfish_battery_probe() and
  * goldfish_battery_open().
  */
 static struct goldfish_battery_data *battery_data;

 enum {
 	/* status register */
 	BATTERY_INT_STATUS	    = 0x00,
 	/* set this to enable IRQ */
 	BATTERY_INT_ENABLE	    = 0x04,

 	BATTERY_AC_ONLINE       = 0x08,
 	BATTERY_STATUS          = 0x0C,
 	BATTERY_HEALTH          = 0x10,
 	BATTERY_PRESENT         = 0x14,
 	BATTERY_CAPACITY        = 0x18,

 	BATTERY_STATUS_CHANGED	= 1U << 0,
 	AC_STATUS_CHANGED	= 1U << 1,
 	BATTERY_INT_MASK        = BATTERY_STATUS_CHANGED | AC_STATUS_CHANGED,
 };


 static int goldfish_ac_get_property(struct power_supply *psy,
 			enum power_supply_property psp,
 			union power_supply_propval *val)
 {
 	struct goldfish_battery_data *data = power_supply_get_drvdata(psy);
 	int ret = 0;

 	switch (psp) {
 	case POWER_SUPPLY_PROP_ONLINE:
 		val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_AC_ONLINE);
 		break;
 	default:
 		ret = -EINVAL;
 		break;
 	}
 	return ret;
 }

 static int goldfish_battery_get_property(struct power_supply *psy,
 				 enum power_supply_property psp,
 				 union power_supply_propval *val)
 {
 	struct goldfish_battery_data *data = power_supply_get_drvdata(psy);
 	int ret = 0;

 	switch (psp) {
 	case POWER_SUPPLY_PROP_STATUS:
 		val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_STATUS);
 		break;
 	case POWER_SUPPLY_PROP_HEALTH:
 		val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_HEALTH);
 		break;
 	case POWER_SUPPLY_PROP_PRESENT:
 		val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_PRESENT);
 		break;
 	case POWER_SUPPLY_PROP_TECHNOLOGY:
 		val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
 		break;
 	case POWER_SUPPLY_PROP_CAPACITY:
 		val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_CAPACITY);
 		break;
 	default:
 		ret = -EINVAL;
 		break;
 	}

 	return ret;
 }

 static enum power_supply_property goldfish_battery_props[] = {
 	POWER_SUPPLY_PROP_STATUS,
 	POWER_SUPPLY_PROP_HEALTH,
 	POWER_SUPPLY_PROP_PRESENT,
 	POWER_SUPPLY_PROP_TECHNOLOGY,
 	POWER_SUPPLY_PROP_CAPACITY,
 };

 static enum power_supply_property goldfish_ac_props[] = {
 	POWER_SUPPLY_PROP_ONLINE,
 };

 static irqreturn_t goldfish_battery_interrupt(int irq, void *dev_id)
 {
 	unsigned long irq_flags;
 	struct goldfish_battery_data *data = dev_id;
 	uint32_t status;

 	spin_lock_irqsave(&data->lock, irq_flags);

 	/* read status flags, which will clear the interrupt */
 	status = GOLDFISH_BATTERY_READ(data, BATTERY_INT_STATUS);
 	status &= BATTERY_INT_MASK;

 	if (status & BATTERY_STATUS_CHANGED)
 		power_supply_changed(data->battery);
 	if (status & AC_STATUS_CHANGED)
 		power_supply_changed(data->ac);

 	spin_unlock_irqrestore(&data->lock, irq_flags);
 	return status ? IRQ_HANDLED : IRQ_NONE;
 }

 static const struct power_supply_desc battery_desc = {
 	.properties	= goldfish_battery_props,
 	.num_properties	= ARRAY_SIZE(goldfish_battery_props),
 	.get_property	= goldfish_battery_get_property,
 	.name		= "battery",
 	.type		= POWER_SUPPLY_TYPE_BATTERY,
 };

 static const struct power_supply_desc ac_desc = {
 	.properties	= goldfish_ac_props,
 	.num_properties	= ARRAY_SIZE(goldfish_ac_props),
 	.get_property	= goldfish_ac_get_property,
 	.name		= "ac",
 	.type		= POWER_SUPPLY_TYPE_MAINS,
 };

 static int goldfish_battery_probe(struct platform_device *pdev)
 {
 	int ret;
 	struct resource *r;
 	struct goldfish_battery_data *data;
 	struct power_supply_config psy_cfg = {};

 	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
 	if (data == NULL)
 		return -ENOMEM;

 	spin_lock_init(&data->lock);

 	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (r == NULL) {
 		dev_err(&pdev->dev, "platform_get_resource failed\n");
 		return -ENODEV;
 	}

 	data->reg_base = devm_ioremap(&pdev->dev, r->start, resource_size(r));
 	if (data->reg_base == NULL) {
 		dev_err(&pdev->dev, "unable to remap MMIO\n");
 		return -ENOMEM;
 	}

 	data->irq = platform_get_irq(pdev, 0);
 	if (data->irq < 0) {
 		dev_err(&pdev->dev, "platform_get_irq failed\n");
 		return -ENODEV;
 	}

 	ret = devm_request_irq(&pdev->dev, data->irq, goldfish_battery_interrupt,
 						IRQF_SHARED, pdev->name, data);
 	if (ret)
 		return ret;

 	psy_cfg.drv_data = data;

 	data->ac = power_supply_register(&pdev->dev, &ac_desc, &psy_cfg);
 	if (IS_ERR(data->ac))
 		return PTR_ERR(data->ac);

 	data->battery = power_supply_register(&pdev->dev, &battery_desc,
 						&psy_cfg);
 	if (IS_ERR(data->battery)) {
 		power_supply_unregister(data->ac);
 		return PTR_ERR(data->battery);
 	}

 	platform_set_drvdata(pdev, data);
 	battery_data = data;

 	GOLDFISH_BATTERY_WRITE(data, BATTERY_INT_ENABLE, BATTERY_INT_MASK);
 	return 0;
 }

 static int goldfish_battery_remove(struct platform_device *pdev)
 {
 	struct goldfish_battery_data *data = platform_get_drvdata(pdev);

 	power_supply_unregister(data->battery);
 	power_supply_unregister(data->ac);
 	battery_data = NULL;
 	return 0;
 }

 static const struct of_device_id goldfish_battery_of_match[] = {
 	{ .compatible = "google,goldfish-battery", },
 	{},
 };
 MODULE_DEVICE_TABLE(of, goldfish_battery_of_match);

 static const struct acpi_device_id goldfish_battery_acpi_match[] = {
 	{ "GFSH0001", 0 },
 	{ },
 };
 MODULE_DEVICE_TABLE(acpi, goldfish_battery_acpi_match);

 static struct platform_driver goldfish_battery_device = {
 	.probe		= goldfish_battery_probe,
 	.remove		= goldfish_battery_remove,
 	.driver = {
 		.name = "goldfish-battery",
 		.of_match_table = goldfish_battery_of_match,
 		.acpi_match_table = ACPI_PTR(goldfish_battery_acpi_match),
 	}
 };
 module_platform_driver(goldfish_battery_device);

 MODULE_AUTHOR("Mike Lockwood lockwood@android.com");
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("Battery driver for the Goldfish emulator");
	/*
	* Power supply driver for the goldfish emulator
	*
	* Copyright (C) 2008 Google, Inc.
	* Copyright (C) 2012 Intel, Inc.
	* Copyright (C) 2013 Intel, Inc.
	* Author: Mike Lockwood <lockwood@android.com>
	*
	* This software is licensed under the terms of the GNU General Public
	* License version 2, as published by the Free Software Foundation, and
	* may be copied, distributed, and modified under those terms.
	*
	* 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.
	*/

	#include <linux/module.h>
	#include <linux/err.h>
	#include <linux/platform_device.h>
	#include <linux/power_supply.h>
	#include <linux/types.h>
	#include <linux/pci.h>
	#include <linux/interrupt.h>
	#include <linux/io.h>
	#include <linux/acpi.h>

	struct goldfish_battery_data {
	void __iomem *reg_base;
	int irq;
	spinlock_t lock;

	struct power_supply *battery;
	struct power_supply *ac;
	};

	#define GOLDFISH_BATTERY_READ(data, addr) \
	(readl(data->reg_base + addr))
	#define GOLDFISH_BATTERY_WRITE(data, addr, x) \
	(writel(x, data->reg_base + addr))

	/*
	* Temporary variable used between goldfish_battery_probe() and
	* goldfish_battery_open().
	*/
	static struct goldfish_battery_data *battery_data;

	enum {
	/* status register */
	BATTERY_INT_STATUS = 0x00,
	/* set this to enable IRQ */
	BATTERY_INT_ENABLE = 0x04,

	BATTERY_AC_ONLINE = 0x08,
	BATTERY_STATUS = 0x0C,
	BATTERY_HEALTH = 0x10,
	BATTERY_PRESENT = 0x14,
	BATTERY_CAPACITY = 0x18,

	BATTERY_STATUS_CHANGED = 1U << 0,
	AC_STATUS_CHANGED = 1U << 1,
	BATTERY_INT_MASK = BATTERY_STATUS_CHANGED \| AC_STATUS_CHANGED,
	};


	static int goldfish_ac_get_property(struct power_supply *psy,
	enum power_supply_property psp,
	union power_supply_propval *val)
	{
	struct goldfish_battery_data *data = power_supply_get_drvdata(psy);
	int ret = 0;

	switch (psp) {
	case POWER_SUPPLY_PROP_ONLINE:
	val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_AC_ONLINE);
	break;
	default:
	ret = -EINVAL;
	break;
	}
	return ret;
	}

	static int goldfish_battery_get_property(struct power_supply *psy,
	enum power_supply_property psp,
	union power_supply_propval *val)
	{
	struct goldfish_battery_data *data = power_supply_get_drvdata(psy);
	int ret = 0;

	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
	val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_STATUS);
	break;
	case POWER_SUPPLY_PROP_HEALTH:
	val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_HEALTH);
	break;
	case POWER_SUPPLY_PROP_PRESENT:
	val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_PRESENT);
	break;
	case POWER_SUPPLY_PROP_TECHNOLOGY:
	val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
	break;
	case POWER_SUPPLY_PROP_CAPACITY:
	val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_CAPACITY);
	break;
	default:
	ret = -EINVAL;
	break;
	}

	return ret;
	}

	static enum power_supply_property goldfish_battery_props[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_HEALTH,
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_TECHNOLOGY,
	POWER_SUPPLY_PROP_CAPACITY,
	};

	static enum power_supply_property goldfish_ac_props[] = {
	POWER_SUPPLY_PROP_ONLINE,
	};

	static irqreturn_t goldfish_battery_interrupt(int irq, void *dev_id)
	{
	unsigned long irq_flags;
	struct goldfish_battery_data *data = dev_id;
	uint32_t status;

	spin_lock_irqsave(&data->lock, irq_flags);

	/* read status flags, which will clear the interrupt */
	status = GOLDFISH_BATTERY_READ(data, BATTERY_INT_STATUS);
	status &= BATTERY_INT_MASK;

	if (status & BATTERY_STATUS_CHANGED)
	power_supply_changed(data->battery);
	if (status & AC_STATUS_CHANGED)
	power_supply_changed(data->ac);

	spin_unlock_irqrestore(&data->lock, irq_flags);
	return status ? IRQ_HANDLED : IRQ_NONE;
	}

	static const struct power_supply_desc battery_desc = {
	.properties = goldfish_battery_props,
	.num_properties = ARRAY_SIZE(goldfish_battery_props),
	.get_property = goldfish_battery_get_property,
	.name = "battery",
	.type = POWER_SUPPLY_TYPE_BATTERY,
	};

	static const struct power_supply_desc ac_desc = {
	.properties = goldfish_ac_props,
	.num_properties = ARRAY_SIZE(goldfish_ac_props),
	.get_property = goldfish_ac_get_property,
	.name = "ac",
	.type = POWER_SUPPLY_TYPE_MAINS,
	};

	static int goldfish_battery_probe(struct platform_device *pdev)
	{
	int ret;
	struct resource *r;
	struct goldfish_battery_data *data;
	struct power_supply_config psy_cfg = {};

	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
	if (data == NULL)
	return -ENOMEM;

	spin_lock_init(&data->lock);

	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (r == NULL) {
	dev_err(&pdev->dev, "platform_get_resource failed\n");
	return -ENODEV;
	}

	data->reg_base = devm_ioremap(&pdev->dev, r->start, resource_size(r));
	if (data->reg_base == NULL) {
	dev_err(&pdev->dev, "unable to remap MMIO\n");
	return -ENOMEM;
	}

	data->irq = platform_get_irq(pdev, 0);
	if (data->irq < 0) {
	dev_err(&pdev->dev, "platform_get_irq failed\n");
	return -ENODEV;
	}

	ret = devm_request_irq(&pdev->dev, data->irq, goldfish_battery_interrupt,
	IRQF_SHARED, pdev->name, data);
	if (ret)
	return ret;

	psy_cfg.drv_data = data;

	data->ac = power_supply_register(&pdev->dev, &ac_desc, &psy_cfg);
	if (IS_ERR(data->ac))
	return PTR_ERR(data->ac);

	data->battery = power_supply_register(&pdev->dev, &battery_desc,
	&psy_cfg);
	if (IS_ERR(data->battery)) {
	power_supply_unregister(data->ac);
	return PTR_ERR(data->battery);
	}

	platform_set_drvdata(pdev, data);
	battery_data = data;

	GOLDFISH_BATTERY_WRITE(data, BATTERY_INT_ENABLE, BATTERY_INT_MASK);
	return 0;
	}

	static int goldfish_battery_remove(struct platform_device *pdev)
	{
	struct goldfish_battery_data *data = platform_get_drvdata(pdev);

	power_supply_unregister(data->battery);
	power_supply_unregister(data->ac);
	battery_data = NULL;
	return 0;
	}

	static const struct of_device_id goldfish_battery_of_match[] = {
	{ .compatible = "google,goldfish-battery", },
	{},
	};
	MODULE_DEVICE_TABLE(of, goldfish_battery_of_match);

	static const struct acpi_device_id goldfish_battery_acpi_match[] = {
	{ "GFSH0001", 0 },
	{ },
	};
	MODULE_DEVICE_TABLE(acpi, goldfish_battery_acpi_match);

	static struct platform_driver goldfish_battery_device = {
	.probe = goldfish_battery_probe,
	.remove = goldfish_battery_remove,
	.driver = {
	.name = "goldfish-battery",
	.of_match_table = goldfish_battery_of_match,
	.acpi_match_table = ACPI_PTR(goldfish_battery_acpi_match),
	}
	};
	module_platform_driver(goldfish_battery_device);

	MODULE_AUTHOR("Mike Lockwood lockwood@android.com");
	MODULE_LICENSE("GPL");
	MODULE_DESCRIPTION("Battery driver for the Goldfish emulator");