[linux-2.6-block.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 <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");
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 <lockwood@android.com>
	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>
fdb2f37a	27	#include <linux/acpi.h>
84d7b768 ML	28
	29	struct goldfish_battery_data {
	30	void __iomem *reg_base;
	31	int irq;
	32	spinlock_t lock;
	33
297d716f KK	34	struct power_supply *battery;
297d716f KK	35	struct power_supply *ac;
84d7b768 ML	36	};
	37
	38	#define GOLDFISH_BATTERY_READ(data, addr) \
	39	(readl(data->reg_base + addr))
	40	#define GOLDFISH_BATTERY_WRITE(data, addr, x) \
	41	(writel(x, data->reg_base + addr))
	42
	43	/*
	44	* Temporary variable used between goldfish_battery_probe() and
	45	* goldfish_battery_open().
	46	*/
	47	static struct goldfish_battery_data *battery_data;
	48
	49	enum {
	50	/* status register */
	51	BATTERY_INT_STATUS = 0x00,
	52	/* set this to enable IRQ */
	53	BATTERY_INT_ENABLE = 0x04,
	54
	55	BATTERY_AC_ONLINE = 0x08,
	56	BATTERY_STATUS = 0x0C,
	57	BATTERY_HEALTH = 0x10,
	58	BATTERY_PRESENT = 0x14,
	59	BATTERY_CAPACITY = 0x18,
	60
	61	BATTERY_STATUS_CHANGED = 1U << 0,
	62	AC_STATUS_CHANGED = 1U << 1,
	63	BATTERY_INT_MASK = BATTERY_STATUS_CHANGED \| AC_STATUS_CHANGED,
	64	};
	65
	66
	67	static int goldfish_ac_get_property(struct power_supply *psy,
	68	enum power_supply_property psp,
	69	union power_supply_propval *val)
	70	{
297d716f	71	struct goldfish_battery_data *data = power_supply_get_drvdata(psy);
84d7b768 ML	72	int ret = 0;
	73
	74	switch (psp) {
	75	case POWER_SUPPLY_PROP_ONLINE:
	76	val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_AC_ONLINE);
	77	break;
	78	default:
	79	ret = -EINVAL;
	80	break;
	81	}
	82	return ret;
	83	}
	84
	85	static int goldfish_battery_get_property(struct power_supply *psy,
	86	enum power_supply_property psp,
	87	union power_supply_propval *val)
	88	{
297d716f	89	struct goldfish_battery_data *data = power_supply_get_drvdata(psy);
84d7b768 ML	90	int ret = 0;
	91
	92	switch (psp) {
	93	case POWER_SUPPLY_PROP_STATUS:
	94	val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_STATUS);
	95	break;
	96	case POWER_SUPPLY_PROP_HEALTH:
	97	val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_HEALTH);
	98	break;
	99	case POWER_SUPPLY_PROP_PRESENT:
	100	val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_PRESENT);
	101	break;
	102	case POWER_SUPPLY_PROP_TECHNOLOGY:
	103	val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
	104	break;
	105	case POWER_SUPPLY_PROP_CAPACITY:
	106	val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_CAPACITY);
	107	break;
	108	default:
	109	ret = -EINVAL;
	110	break;
	111	}
	112
	113	return ret;
	114	}
	115
	116	static enum power_supply_property goldfish_battery_props[] = {
	117	POWER_SUPPLY_PROP_STATUS,
	118	POWER_SUPPLY_PROP_HEALTH,
	119	POWER_SUPPLY_PROP_PRESENT,
	120	POWER_SUPPLY_PROP_TECHNOLOGY,
	121	POWER_SUPPLY_PROP_CAPACITY,
	122	};
	123
	124	static enum power_supply_property goldfish_ac_props[] = {
	125	POWER_SUPPLY_PROP_ONLINE,
	126	};
	127
	128	static irqreturn_t goldfish_battery_interrupt(int irq, void *dev_id)
	129	{
	130	unsigned long irq_flags;
	131	struct goldfish_battery_data *data = dev_id;
	132	uint32_t status;
	133
	134	spin_lock_irqsave(&data->lock, irq_flags);
	135
	136	/* read status flags, which will clear the interrupt */
	137	status = GOLDFISH_BATTERY_READ(data, BATTERY_INT_STATUS);
	138	status &= BATTERY_INT_MASK;
	139
	140	if (status & BATTERY_STATUS_CHANGED)
297d716f	141	power_supply_changed(data->battery);
84d7b768	142	if (status & AC_STATUS_CHANGED)
297d716f	143	power_supply_changed(data->ac);
84d7b768 ML	144
	145	spin_unlock_irqrestore(&data->lock, irq_flags);
	146	return status ? IRQ_HANDLED : IRQ_NONE;
	147	}
	148
297d716f KK	149	static const struct power_supply_desc battery_desc = {
	150	.properties = goldfish_battery_props,
	151	.num_properties = ARRAY_SIZE(goldfish_battery_props),
	152	.get_property = goldfish_battery_get_property,
	153	.name = "battery",
	154	.type = POWER_SUPPLY_TYPE_BATTERY,
	155	};
	156
	157	static const struct power_supply_desc ac_desc = {
	158	.properties = goldfish_ac_props,
	159	.num_properties = ARRAY_SIZE(goldfish_ac_props),
	160	.get_property = goldfish_ac_get_property,
	161	.name = "ac",
	162	.type = POWER_SUPPLY_TYPE_MAINS,
	163	};
84d7b768 ML	164
	165	static int goldfish_battery_probe(struct platform_device *pdev)
	166	{
	167	int ret;
	168	struct resource *r;
	169	struct goldfish_battery_data *data;
297d716f	170	struct power_supply_config psy_cfg = {};
84d7b768 ML	171
	172	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
	173	if (data == NULL)
	174	return -ENOMEM;
	175
	176	spin_lock_init(&data->lock);
	177
84d7b768 ML	178	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	179	if (r == NULL) {
	180	dev_err(&pdev->dev, "platform_get_resource failed\n");
	181	return -ENODEV;
	182	}
	183
a92d4c7d	184	data->reg_base = devm_ioremap(&pdev->dev, r->start, resource_size(r));
84d7b768 ML	185	if (data->reg_base == NULL) {
	186	dev_err(&pdev->dev, "unable to remap MMIO\n");
	187	return -ENOMEM;
	188	}
	189
	190	data->irq = platform_get_irq(pdev, 0);
	191	if (data->irq < 0) {
	192	dev_err(&pdev->dev, "platform_get_irq failed\n");
	193	return -ENODEV;
	194	}
	195
	196	ret = devm_request_irq(&pdev->dev, data->irq, goldfish_battery_interrupt,
	197	IRQF_SHARED, pdev->name, data);
	198	if (ret)
	199	return ret;
	200
297d716f	201	psy_cfg.drv_data = data;
84d7b768	202
297d716f KK	203	data->ac = power_supply_register(&pdev->dev, &ac_desc, &psy_cfg);
	204	if (IS_ERR(data->ac))
	205	return PTR_ERR(data->ac);
	206
	207	data->battery = power_supply_register(&pdev->dev, &battery_desc,
	208	&psy_cfg);
	209	if (IS_ERR(data->battery)) {
	210	power_supply_unregister(data->ac);
	211	return PTR_ERR(data->battery);
84d7b768 ML	212	}
	213
	214	platform_set_drvdata(pdev, data);
	215	battery_data = data;
	216
	217	GOLDFISH_BATTERY_WRITE(data, BATTERY_INT_ENABLE, BATTERY_INT_MASK);
	218	return 0;
	219	}
	220
	221	static int goldfish_battery_remove(struct platform_device *pdev)
	222	{
	223	struct goldfish_battery_data *data = platform_get_drvdata(pdev);
	224
297d716f KK	225	power_supply_unregister(data->battery);
297d716f KK	226	power_supply_unregister(data->ac);
84d7b768 ML	227	battery_data = NULL;
	228	return 0;
	229	}
	230
65d687a7 GH	231	static const struct of_device_id goldfish_battery_of_match[] = {
	232	{ .compatible = "google,goldfish-battery", },
	233	{},
	234	};
	235	MODULE_DEVICE_TABLE(of, goldfish_battery_of_match);
	236
fdb2f37a YN	237	static const struct acpi_device_id goldfish_battery_acpi_match[] = {
	238	{ "GFSH0001", 0 },
	239	{ },
	240	};
	241	MODULE_DEVICE_TABLE(acpi, goldfish_battery_acpi_match);
	242
84d7b768 ML	243	static struct platform_driver goldfish_battery_device = {
	244	.probe = goldfish_battery_probe,
	245	.remove = goldfish_battery_remove,
	246	.driver = {
65d687a7 GH	247	.name = "goldfish-battery",
65d687a7 GH	248	.of_match_table = goldfish_battery_of_match,
fdb2f37a	249	.acpi_match_table = ACPI_PTR(goldfish_battery_acpi_match),
84d7b768 ML	250	}
	251	};
	252	module_platform_driver(goldfish_battery_device);
	253
	254	MODULE_AUTHOR("Mike Lockwood lockwood@android.com");
	255	MODULE_LICENSE("GPL");
	256	MODULE_DESCRIPTION("Battery driver for the Goldfish emulator");