[linux.git] / drivers / power / goldfish_battery.c

/*
 * 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 <[email protected]>
 *
 * 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>

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 struct platform_driver goldfish_battery_device = {
	.probe		= goldfish_battery_probe,
	.remove		= goldfish_battery_remove,
	.driver = {
		.name = "goldfish-battery"
	}
};
module_platform_driver(goldfish_battery_device);

MODULE_AUTHOR("Mike Lockwood [email protected]");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Battery driver for the Goldfish emulator");
Commit	Line	Data
84d7b768 ML	1	/*
	2	* Power supply driver for the goldfish emulator
	3	*
	4	* Copyright (C) 2008 Google, Inc.
	5	* Copyright (C) 2012 Intel, Inc.
	6	* Copyright (C) 2013 Intel, Inc.
	7	* Author: Mike Lockwood <[email protected]>
	8	*
	9	* This software is licensed under the terms of the GNU General Public
	10	* License version 2, as published by the Free Software Foundation, and
	11	* may be copied, distributed, and modified under those terms.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*/
	18
	19	#include <linux/module.h>
	20	#include <linux/err.h>
	21	#include <linux/platform_device.h>
	22	#include <linux/power_supply.h>
	23	#include <linux/types.h>
	24	#include <linux/pci.h>
	25	#include <linux/interrupt.h>
	26	#include <linux/io.h>
	27
	28	struct goldfish_battery_data {
	29	void __iomem *reg_base;
	30	int irq;
	31	spinlock_t lock;
	32
297d716f KK	33	struct power_supply *battery;
297d716f KK	34	struct power_supply *ac;
84d7b768 ML	35	};
	36
	37	#define GOLDFISH_BATTERY_READ(data, addr) \
	38	(readl(data->reg_base + addr))
	39	#define GOLDFISH_BATTERY_WRITE(data, addr, x) \
	40	(writel(x, data->reg_base + addr))
	41
	42	/*
	43	* Temporary variable used between goldfish_battery_probe() and
	44	* goldfish_battery_open().
	45	*/
	46	static struct goldfish_battery_data *battery_data;
	47
	48	enum {
	49	/* status register */
	50	BATTERY_INT_STATUS = 0x00,
	51	/* set this to enable IRQ */
	52	BATTERY_INT_ENABLE = 0x04,
	53
	54	BATTERY_AC_ONLINE = 0x08,
	55	BATTERY_STATUS = 0x0C,
	56	BATTERY_HEALTH = 0x10,
	57	BATTERY_PRESENT = 0x14,
	58	BATTERY_CAPACITY = 0x18,
	59
	60	BATTERY_STATUS_CHANGED = 1U << 0,
	61	AC_STATUS_CHANGED = 1U << 1,
	62	BATTERY_INT_MASK = BATTERY_STATUS_CHANGED \| AC_STATUS_CHANGED,
	63	};
	64
	65
	66	static int goldfish_ac_get_property(struct power_supply *psy,
	67	enum power_supply_property psp,
	68	union power_supply_propval *val)
	69	{
297d716f	70	struct goldfish_battery_data *data = power_supply_get_drvdata(psy);
84d7b768 ML	71	int ret = 0;
	72
	73	switch (psp) {
	74	case POWER_SUPPLY_PROP_ONLINE:
	75	val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_AC_ONLINE);
	76	break;
	77	default:
	78	ret = -EINVAL;
	79	break;
	80	}
	81	return ret;
	82	}
	83
	84	static int goldfish_battery_get_property(struct power_supply *psy,
	85	enum power_supply_property psp,
	86	union power_supply_propval *val)
	87	{
297d716f	88	struct goldfish_battery_data *data = power_supply_get_drvdata(psy);
84d7b768 ML	89	int ret = 0;
	90
	91	switch (psp) {
	92	case POWER_SUPPLY_PROP_STATUS:
	93	val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_STATUS);
	94	break;
	95	case POWER_SUPPLY_PROP_HEALTH:
	96	val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_HEALTH);
	97	break;
	98	case POWER_SUPPLY_PROP_PRESENT:
	99	val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_PRESENT);
	100	break;
	101	case POWER_SUPPLY_PROP_TECHNOLOGY:
	102	val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
	103	break;
	104	case POWER_SUPPLY_PROP_CAPACITY:
	105	val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_CAPACITY);
	106	break;
	107	default:
	108	ret = -EINVAL;
	109	break;
	110	}
	111
	112	return ret;
	113	}
	114
	115	static enum power_supply_property goldfish_battery_props[] = {
	116	POWER_SUPPLY_PROP_STATUS,
	117	POWER_SUPPLY_PROP_HEALTH,
	118	POWER_SUPPLY_PROP_PRESENT,
	119	POWER_SUPPLY_PROP_TECHNOLOGY,
	120	POWER_SUPPLY_PROP_CAPACITY,
	121	};
	122
	123	static enum power_supply_property goldfish_ac_props[] = {
	124	POWER_SUPPLY_PROP_ONLINE,
	125	};
	126
	127	static irqreturn_t goldfish_battery_interrupt(int irq, void *dev_id)
	128	{
	129	unsigned long irq_flags;
	130	struct goldfish_battery_data *data = dev_id;
	131	uint32_t status;
	132
	133	spin_lock_irqsave(&data->lock, irq_flags);
	134
	135	/* read status flags, which will clear the interrupt */
	136	status = GOLDFISH_BATTERY_READ(data, BATTERY_INT_STATUS);
	137	status &= BATTERY_INT_MASK;
	138
	139	if (status & BATTERY_STATUS_CHANGED)
297d716f	140	power_supply_changed(data->battery);
84d7b768	141	if (status & AC_STATUS_CHANGED)
297d716f	142	power_supply_changed(data->ac);
84d7b768 ML	143
	144	spin_unlock_irqrestore(&data->lock, irq_flags);
	145	return status ? IRQ_HANDLED : IRQ_NONE;
	146	}
	147
297d716f KK	148	static const struct power_supply_desc battery_desc = {
	149	.properties = goldfish_battery_props,
	150	.num_properties = ARRAY_SIZE(goldfish_battery_props),
	151	.get_property = goldfish_battery_get_property,
	152	.name = "battery",
	153	.type = POWER_SUPPLY_TYPE_BATTERY,
	154	};
	155
	156	static const struct power_supply_desc ac_desc = {
	157	.properties = goldfish_ac_props,
	158	.num_properties = ARRAY_SIZE(goldfish_ac_props),
	159	.get_property = goldfish_ac_get_property,
	160	.name = "ac",
	161	.type = POWER_SUPPLY_TYPE_MAINS,
	162	};
84d7b768 ML	163
	164	static int goldfish_battery_probe(struct platform_device *pdev)
	165	{
	166	int ret;
	167	struct resource *r;
	168	struct goldfish_battery_data *data;
297d716f	169	struct power_supply_config psy_cfg = {};
84d7b768 ML	170
	171	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
	172	if (data == NULL)
	173	return -ENOMEM;
	174
	175	spin_lock_init(&data->lock);
	176
84d7b768 ML	177	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	178	if (r == NULL) {
	179	dev_err(&pdev->dev, "platform_get_resource failed\n");
	180	return -ENODEV;
	181	}
	182
a92d4c7d	183	data->reg_base = devm_ioremap(&pdev->dev, r->start, resource_size(r));
84d7b768 ML	184	if (data->reg_base == NULL) {
	185	dev_err(&pdev->dev, "unable to remap MMIO\n");
	186	return -ENOMEM;
	187	}
	188
	189	data->irq = platform_get_irq(pdev, 0);
	190	if (data->irq < 0) {
	191	dev_err(&pdev->dev, "platform_get_irq failed\n");
	192	return -ENODEV;
	193	}
	194
	195	ret = devm_request_irq(&pdev->dev, data->irq, goldfish_battery_interrupt,
	196	IRQF_SHARED, pdev->name, data);
	197	if (ret)
	198	return ret;
	199
297d716f	200	psy_cfg.drv_data = data;
84d7b768	201
297d716f KK	202	data->ac = power_supply_register(&pdev->dev, &ac_desc, &psy_cfg);
	203	if (IS_ERR(data->ac))
	204	return PTR_ERR(data->ac);
	205
	206	data->battery = power_supply_register(&pdev->dev, &battery_desc,
	207	&psy_cfg);
	208	if (IS_ERR(data->battery)) {
	209	power_supply_unregister(data->ac);
	210	return PTR_ERR(data->battery);
84d7b768 ML	211	}
	212
	213	platform_set_drvdata(pdev, data);
	214	battery_data = data;
	215
	216	GOLDFISH_BATTERY_WRITE(data, BATTERY_INT_ENABLE, BATTERY_INT_MASK);
	217	return 0;
	218	}
	219
	220	static int goldfish_battery_remove(struct platform_device *pdev)
	221	{
	222	struct goldfish_battery_data *data = platform_get_drvdata(pdev);
	223
297d716f KK	224	power_supply_unregister(data->battery);
297d716f KK	225	power_supply_unregister(data->ac);
84d7b768 ML	226	battery_data = NULL;
	227	return 0;
	228	}
	229
	230	static struct platform_driver goldfish_battery_device = {
	231	.probe = goldfish_battery_probe,
	232	.remove = goldfish_battery_remove,
	233	.driver = {
	234	.name = "goldfish-battery"
	235	}
	236	};
	237	module_platform_driver(goldfish_battery_device);
	238
	239	MODULE_AUTHOR("Mike Lockwood [email protected]");
	240	MODULE_LICENSE("GPL");
	241	MODULE_DESCRIPTION("Battery driver for the Goldfish emulator");