[linux-2.6-block.git] / drivers / power / z2_battery.c

/*
 * Battery measurement code for Zipit Z2
 *
 * Copyright (C) 2009 Peter Edwards <sweetlilmre@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */

#include <linux/module.h>
#include <linux/gpio.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/power_supply.h>
#include <linux/slab.h>
#include <linux/z2_battery.h>

#define	Z2_DEFAULT_NAME	"Z2"

struct z2_charger {
	struct z2_battery_info		*info;
	int				bat_status;
	struct i2c_client		*client;
	struct power_supply		*batt_ps;
	struct power_supply_desc	batt_ps_desc;
	struct mutex			work_lock;
	struct work_struct		bat_work;
};

static unsigned long z2_read_bat(struct z2_charger *charger)
{
	int data;
	data = i2c_smbus_read_byte_data(charger->client,
					charger->info->batt_I2C_reg);
	if (data < 0)
		return 0;

	return data * charger->info->batt_mult / charger->info->batt_div;
}

static int z2_batt_get_property(struct power_supply *batt_ps,
			    enum power_supply_property psp,
			    union power_supply_propval *val)
{
	struct z2_charger *charger = power_supply_get_drvdata(batt_ps);
	struct z2_battery_info *info = charger->info;

	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
		val->intval = charger->bat_status;
		break;
	case POWER_SUPPLY_PROP_TECHNOLOGY:
		val->intval = info->batt_tech;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
		if (info->batt_I2C_reg >= 0)
			val->intval = z2_read_bat(charger);
		else
			return -EINVAL;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_MAX:
		if (info->max_voltage >= 0)
			val->intval = info->max_voltage;
		else
			return -EINVAL;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_MIN:
		if (info->min_voltage >= 0)
			val->intval = info->min_voltage;
		else
			return -EINVAL;
		break;
	case POWER_SUPPLY_PROP_PRESENT:
		val->intval = 1;
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static void z2_batt_ext_power_changed(struct power_supply *batt_ps)
{
	struct z2_charger *charger = power_supply_get_drvdata(batt_ps);

	schedule_work(&charger->bat_work);
}

static void z2_batt_update(struct z2_charger *charger)
{
	int old_status = charger->bat_status;
	struct z2_battery_info *info;

	info = charger->info;

	mutex_lock(&charger->work_lock);

	charger->bat_status = (info->charge_gpio >= 0) ?
		(gpio_get_value(info->charge_gpio) ?
		POWER_SUPPLY_STATUS_CHARGING :
		POWER_SUPPLY_STATUS_DISCHARGING) :
		POWER_SUPPLY_STATUS_UNKNOWN;

	if (old_status != charger->bat_status) {
		pr_debug("%s: %i -> %i\n", charger->batt_ps->desc->name,
				old_status,
				charger->bat_status);
		power_supply_changed(charger->batt_ps);
	}

	mutex_unlock(&charger->work_lock);
}

static void z2_batt_work(struct work_struct *work)
{
	struct z2_charger *charger;
	charger = container_of(work, struct z2_charger, bat_work);
	z2_batt_update(charger);
}

static irqreturn_t z2_charge_switch_irq(int irq, void *devid)
{
	struct z2_charger *charger = devid;
	schedule_work(&charger->bat_work);
	return IRQ_HANDLED;
}

static int z2_batt_ps_init(struct z2_charger *charger, int props)
{
	int i = 0;
	enum power_supply_property *prop;
	struct z2_battery_info *info = charger->info;

	if (info->charge_gpio >= 0)
		props++;	/* POWER_SUPPLY_PROP_STATUS */
	if (info->batt_tech >= 0)
		props++;	/* POWER_SUPPLY_PROP_TECHNOLOGY */
	if (info->batt_I2C_reg >= 0)
		props++;	/* POWER_SUPPLY_PROP_VOLTAGE_NOW */
	if (info->max_voltage >= 0)
		props++;	/* POWER_SUPPLY_PROP_VOLTAGE_MAX */
	if (info->min_voltage >= 0)
		props++;	/* POWER_SUPPLY_PROP_VOLTAGE_MIN */

	prop = kzalloc(props * sizeof(*prop), GFP_KERNEL);
	if (!prop)
		return -ENOMEM;

	prop[i++] = POWER_SUPPLY_PROP_PRESENT;
	if (info->charge_gpio >= 0)
		prop[i++] = POWER_SUPPLY_PROP_STATUS;
	if (info->batt_tech >= 0)
		prop[i++] = POWER_SUPPLY_PROP_TECHNOLOGY;
	if (info->batt_I2C_reg >= 0)
		prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_NOW;
	if (info->max_voltage >= 0)
		prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MAX;
	if (info->min_voltage >= 0)
		prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MIN;

	if (!info->batt_name) {
		dev_info(&charger->client->dev,
				"Please consider setting proper battery "
				"name in platform definition file, falling "
				"back to name \" Z2_DEFAULT_NAME \"\n");
		charger->batt_ps_desc.name = Z2_DEFAULT_NAME;
	} else
		charger->batt_ps_desc.name = info->batt_name;

	charger->batt_ps_desc.properties	= prop;
	charger->batt_ps_desc.num_properties	= props;
	charger->batt_ps_desc.type		= POWER_SUPPLY_TYPE_BATTERY;
	charger->batt_ps_desc.get_property	= z2_batt_get_property;
	charger->batt_ps_desc.external_power_changed =
						z2_batt_ext_power_changed;
	charger->batt_ps_desc.use_for_apm	= 1;

	return 0;
}

static int z2_batt_probe(struct i2c_client *client,
				const struct i2c_device_id *id)
{
	int ret = 0;
	int props = 1;	/* POWER_SUPPLY_PROP_PRESENT */
	struct z2_charger *charger;
	struct z2_battery_info *info = client->dev.platform_data;
	struct power_supply_config psy_cfg = {};

	if (info == NULL) {
		dev_err(&client->dev,
			"Please set platform device platform_data"
			" to a valid z2_battery_info pointer!\n");
		return -EINVAL;
	}

	charger = kzalloc(sizeof(*charger), GFP_KERNEL);
	if (charger == NULL)
		return -ENOMEM;

	charger->bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
	charger->info = info;
	charger->client = client;
	i2c_set_clientdata(client, charger);
	psy_cfg.drv_data = charger;

	mutex_init(&charger->work_lock);

	if (info->charge_gpio >= 0 && gpio_is_valid(info->charge_gpio)) {
		ret = gpio_request(info->charge_gpio, "BATT CHRG");
		if (ret)
			goto err;

		ret = gpio_direction_input(info->charge_gpio);
		if (ret)
			goto err2;

		irq_set_irq_type(gpio_to_irq(info->charge_gpio),
				 IRQ_TYPE_EDGE_BOTH);
		ret = request_irq(gpio_to_irq(info->charge_gpio),
				z2_charge_switch_irq, 0,
				"AC Detect", charger);
		if (ret)
			goto err3;
	}

	ret = z2_batt_ps_init(charger, props);
	if (ret)
		goto err3;

	INIT_WORK(&charger->bat_work, z2_batt_work);

	charger->batt_ps = power_supply_register(&client->dev,
						 &charger->batt_ps_desc,
						 &psy_cfg);
	if (IS_ERR(charger->batt_ps)) {
		ret = PTR_ERR(charger->batt_ps);
		goto err4;
	}

	schedule_work(&charger->bat_work);

	return 0;

err4:
	kfree(charger->batt_ps_desc.properties);
err3:
	if (info->charge_gpio >= 0 && gpio_is_valid(info->charge_gpio))
		free_irq(gpio_to_irq(info->charge_gpio), charger);
err2:
	if (info->charge_gpio >= 0 && gpio_is_valid(info->charge_gpio))
		gpio_free(info->charge_gpio);
err:
	kfree(charger);
	return ret;
}

static int z2_batt_remove(struct i2c_client *client)
{
	struct z2_charger *charger = i2c_get_clientdata(client);
	struct z2_battery_info *info = charger->info;

	cancel_work_sync(&charger->bat_work);
	power_supply_unregister(charger->batt_ps);

	kfree(charger->batt_ps_desc.properties);
	if (info->charge_gpio >= 0 && gpio_is_valid(info->charge_gpio)) {
		free_irq(gpio_to_irq(info->charge_gpio), charger);
		gpio_free(info->charge_gpio);
	}

	kfree(charger);

	return 0;
}

#ifdef CONFIG_PM
static int z2_batt_suspend(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct z2_charger *charger = i2c_get_clientdata(client);

	flush_work(&charger->bat_work);
	return 0;
}

static int z2_batt_resume(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct z2_charger *charger = i2c_get_clientdata(client);

	schedule_work(&charger->bat_work);
	return 0;
}

static const struct dev_pm_ops z2_battery_pm_ops = {
	.suspend	= z2_batt_suspend,
	.resume		= z2_batt_resume,
};

#define	Z2_BATTERY_PM_OPS	(&z2_battery_pm_ops)

#else
#define	Z2_BATTERY_PM_OPS	(NULL)
#endif

static const struct i2c_device_id z2_batt_id[] = {
	{ "aer915", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, z2_batt_id);

static struct i2c_driver z2_batt_driver = {
	.driver	= {
		.name	= "z2-battery",
		.owner	= THIS_MODULE,
		.pm	= Z2_BATTERY_PM_OPS
	},
	.probe		= z2_batt_probe,
	.remove		= z2_batt_remove,
	.id_table	= z2_batt_id,
};
module_i2c_driver(z2_batt_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Peter Edwards <sweetlilmre@gmail.com>");
MODULE_DESCRIPTION("Zipit Z2 battery driver");
Commit	Line	Data
e3e8d1c9 MV	1	/*
	2	* Battery measurement code for Zipit Z2
	3	*
	4	* Copyright (C) 2009 Peter Edwards <sweetlilmre@gmail.com>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*
	10	*/
	11
e3e8d1c9	12	#include <linux/module.h>
e3e8d1c9	13	#include <linux/gpio.h>
56b925fc	14	#include <linux/i2c.h>
e3e8d1c9 MV	15	#include <linux/interrupt.h>
e3e8d1c9 MV	16	#include <linux/irq.h>
56b925fc MV	17	#include <linux/power_supply.h>
56b925fc MV	18	#include <linux/slab.h>
e3e8d1c9 MV	19	#include <linux/z2_battery.h>
	20
	21	#define Z2_DEFAULT_NAME "Z2"
	22
	23	struct z2_charger {
297d716f KK	24	struct z2_battery_info *info;
	25	int bat_status;
	26	struct i2c_client *client;
	27	struct power_supply *batt_ps;
	28	struct power_supply_desc batt_ps_desc;
	29	struct mutex work_lock;
	30	struct work_struct bat_work;
e3e8d1c9 MV	31	};
	32
	33	static unsigned long z2_read_bat(struct z2_charger *charger)
	34	{
	35	int data;
	36	data = i2c_smbus_read_byte_data(charger->client,
	37	charger->info->batt_I2C_reg);
	38	if (data < 0)
	39	return 0;
	40
	41	return data * charger->info->batt_mult / charger->info->batt_div;
	42	}
	43
	44	static int z2_batt_get_property(struct power_supply *batt_ps,
	45	enum power_supply_property psp,
	46	union power_supply_propval *val)
	47	{
297d716f	48	struct z2_charger *charger = power_supply_get_drvdata(batt_ps);
e3e8d1c9 MV	49	struct z2_battery_info *info = charger->info;
	50
	51	switch (psp) {
	52	case POWER_SUPPLY_PROP_STATUS:
	53	val->intval = charger->bat_status;
	54	break;
	55	case POWER_SUPPLY_PROP_TECHNOLOGY:
	56	val->intval = info->batt_tech;
	57	break;
	58	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
	59	if (info->batt_I2C_reg >= 0)
	60	val->intval = z2_read_bat(charger);
	61	else
	62	return -EINVAL;
	63	break;
	64	case POWER_SUPPLY_PROP_VOLTAGE_MAX:
	65	if (info->max_voltage >= 0)
	66	val->intval = info->max_voltage;
	67	else
	68	return -EINVAL;
	69	break;
	70	case POWER_SUPPLY_PROP_VOLTAGE_MIN:
	71	if (info->min_voltage >= 0)
	72	val->intval = info->min_voltage;
	73	else
	74	return -EINVAL;
	75	break;
	76	case POWER_SUPPLY_PROP_PRESENT:
	77	val->intval = 1;
	78	break;
	79	default:
	80	return -EINVAL;
	81	}
	82
	83	return 0;
	84	}
	85
	86	static void z2_batt_ext_power_changed(struct power_supply *batt_ps)
	87	{
297d716f KK	88	struct z2_charger *charger = power_supply_get_drvdata(batt_ps);
297d716f KK	89
e3e8d1c9 MV	90	schedule_work(&charger->bat_work);
	91	}
	92
	93	static void z2_batt_update(struct z2_charger *charger)
	94	{
	95	int old_status = charger->bat_status;
	96	struct z2_battery_info *info;
	97
	98	info = charger->info;
	99
	100	mutex_lock(&charger->work_lock);
	101
	102	charger->bat_status = (info->charge_gpio >= 0) ?
	103	(gpio_get_value(info->charge_gpio) ?
	104	POWER_SUPPLY_STATUS_CHARGING :
	105	POWER_SUPPLY_STATUS_DISCHARGING) :
	106	POWER_SUPPLY_STATUS_UNKNOWN;
	107
	108	if (old_status != charger->bat_status) {
297d716f KK	109	pr_debug("%s: %i -> %i\n", charger->batt_ps->desc->name,
	110	old_status,
	111	charger->bat_status);
	112	power_supply_changed(charger->batt_ps);
e3e8d1c9 MV	113	}
	114
	115	mutex_unlock(&charger->work_lock);
	116	}
	117
	118	static void z2_batt_work(struct work_struct *work)
	119	{
	120	struct z2_charger *charger;
	121	charger = container_of(work, struct z2_charger, bat_work);
	122	z2_batt_update(charger);
	123	}
	124
	125	static irqreturn_t z2_charge_switch_irq(int irq, void *devid)
	126	{
	127	struct z2_charger *charger = devid;
	128	schedule_work(&charger->bat_work);
	129	return IRQ_HANDLED;
	130	}
	131
	132	static int z2_batt_ps_init(struct z2_charger *charger, int props)
	133	{
	134	int i = 0;
	135	enum power_supply_property *prop;
	136	struct z2_battery_info *info = charger->info;
	137
a223246f VK	138	if (info->charge_gpio >= 0)
a223246f VK	139	props++; /* POWER_SUPPLY_PROP_STATUS */
e3e8d1c9 MV	140	if (info->batt_tech >= 0)
	141	props++; /* POWER_SUPPLY_PROP_TECHNOLOGY */
	142	if (info->batt_I2C_reg >= 0)
	143	props++; /* POWER_SUPPLY_PROP_VOLTAGE_NOW */
	144	if (info->max_voltage >= 0)
	145	props++; /* POWER_SUPPLY_PROP_VOLTAGE_MAX */
	146	if (info->min_voltage >= 0)
	147	props++; /* POWER_SUPPLY_PROP_VOLTAGE_MIN */
	148
	149	prop = kzalloc(props * sizeof(*prop), GFP_KERNEL);
	150	if (!prop)
	151	return -ENOMEM;
	152
	153	prop[i++] = POWER_SUPPLY_PROP_PRESENT;
	154	if (info->charge_gpio >= 0)
	155	prop[i++] = POWER_SUPPLY_PROP_STATUS;
	156	if (info->batt_tech >= 0)
	157	prop[i++] = POWER_SUPPLY_PROP_TECHNOLOGY;
	158	if (info->batt_I2C_reg >= 0)
	159	prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_NOW;
	160	if (info->max_voltage >= 0)
	161	prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MAX;
	162	if (info->min_voltage >= 0)
	163	prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MIN;
	164
	165	if (!info->batt_name) {
	166	dev_info(&charger->client->dev,
	167	"Please consider setting proper battery "
	168	"name in platform definition file, falling "
	169	"back to name \" Z2_DEFAULT_NAME \"\n");
297d716f	170	charger->batt_ps_desc.name = Z2_DEFAULT_NAME;
e3e8d1c9	171	} else
297d716f	172	charger->batt_ps_desc.name = info->batt_name;
e3e8d1c9	173
297d716f KK	174	charger->batt_ps_desc.properties = prop;
	175	charger->batt_ps_desc.num_properties = props;
	176	charger->batt_ps_desc.type = POWER_SUPPLY_TYPE_BATTERY;
	177	charger->batt_ps_desc.get_property = z2_batt_get_property;
	178	charger->batt_ps_desc.external_power_changed =
	179	z2_batt_ext_power_changed;
	180	charger->batt_ps_desc.use_for_apm = 1;
e3e8d1c9 MV	181
	182	return 0;
	183	}
	184
c8afa640	185	static int z2_batt_probe(struct i2c_client *client,
e3e8d1c9 MV	186	const struct i2c_device_id *id)
	187	{
	188	int ret = 0;
	189	int props = 1; /* POWER_SUPPLY_PROP_PRESENT */
	190	struct z2_charger *charger;
	191	struct z2_battery_info *info = client->dev.platform_data;
297d716f	192	struct power_supply_config psy_cfg = {};
e3e8d1c9 MV	193
	194	if (info == NULL) {
	195	dev_err(&client->dev,
	196	"Please set platform device platform_data"
	197	" to a valid z2_battery_info pointer!\n");
	198	return -EINVAL;
	199	}
	200
	201	charger = kzalloc(sizeof(*charger), GFP_KERNEL);
	202	if (charger == NULL)
	203	return -ENOMEM;
	204
	205	charger->bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
	206	charger->info = info;
	207	charger->client = client;
	208	i2c_set_clientdata(client, charger);
297d716f	209	psy_cfg.drv_data = charger;
e3e8d1c9 MV	210
	211	mutex_init(&charger->work_lock);
	212
	213	if (info->charge_gpio >= 0 && gpio_is_valid(info->charge_gpio)) {
	214	ret = gpio_request(info->charge_gpio, "BATT CHRG");
	215	if (ret)
	216	goto err;
	217
	218	ret = gpio_direction_input(info->charge_gpio);
	219	if (ret)
	220	goto err2;
	221
dced35ae TG	222	irq_set_irq_type(gpio_to_irq(info->charge_gpio),
dced35ae TG	223	IRQ_TYPE_EDGE_BOTH);
e3e8d1c9	224	ret = request_irq(gpio_to_irq(info->charge_gpio),
3b176b25	225	z2_charge_switch_irq, 0,
e3e8d1c9 MV	226	"AC Detect", charger);
	227	if (ret)
	228	goto err3;
	229	}
	230
	231	ret = z2_batt_ps_init(charger, props);
	232	if (ret)
	233	goto err3;
	234
	235	INIT_WORK(&charger->bat_work, z2_batt_work);
	236
297d716f KK	237	charger->batt_ps = power_supply_register(&client->dev,
	238	&charger->batt_ps_desc,
	239	&psy_cfg);
	240	if (IS_ERR(charger->batt_ps)) {
	241	ret = PTR_ERR(charger->batt_ps);
e3e8d1c9	242	goto err4;
297d716f	243	}
e3e8d1c9 MV	244
	245	schedule_work(&charger->bat_work);
	246
	247	return 0;
	248
	249	err4:
297d716f	250	kfree(charger->batt_ps_desc.properties);
e3e8d1c9 MV	251	err3:
	252	if (info->charge_gpio >= 0 && gpio_is_valid(info->charge_gpio))
	253	free_irq(gpio_to_irq(info->charge_gpio), charger);
	254	err2:
	255	if (info->charge_gpio >= 0 && gpio_is_valid(info->charge_gpio))
	256	gpio_free(info->charge_gpio);
	257	err:
	258	kfree(charger);
	259	return ret;
	260	}
	261
415ec69f	262	static int z2_batt_remove(struct i2c_client *client)
e3e8d1c9 MV	263	{
	264	struct z2_charger *charger = i2c_get_clientdata(client);
	265	struct z2_battery_info *info = charger->info;
	266
bc51e7ff	267	cancel_work_sync(&charger->bat_work);
297d716f	268	power_supply_unregister(charger->batt_ps);
e3e8d1c9	269
297d716f	270	kfree(charger->batt_ps_desc.properties);
e3e8d1c9 MV	271	if (info->charge_gpio >= 0 && gpio_is_valid(info->charge_gpio)) {
	272	free_irq(gpio_to_irq(info->charge_gpio), charger);
	273	gpio_free(info->charge_gpio);
	274	}
	275
	276	kfree(charger);
	277
	278	return 0;
	279	}
	280
	281	#ifdef CONFIG_PM
906649de	282	static int z2_batt_suspend(struct device *dev)
e3e8d1c9	283	{
906649de	284	struct i2c_client *client = to_i2c_client(dev);
bc51e7ff TH	285	struct z2_charger *charger = i2c_get_clientdata(client);
bc51e7ff TH	286
43829731	287	flush_work(&charger->bat_work);
e3e8d1c9 MV	288	return 0;
	289	}
	290
906649de	291	static int z2_batt_resume(struct device *dev)
e3e8d1c9	292	{
906649de	293	struct i2c_client *client = to_i2c_client(dev);
e3e8d1c9 MV	294	struct z2_charger *charger = i2c_get_clientdata(client);
	295
	296	schedule_work(&charger->bat_work);
	297	return 0;
	298	}
906649de MV	299
	300	static const struct dev_pm_ops z2_battery_pm_ops = {
	301	.suspend = z2_batt_suspend,
	302	.resume = z2_batt_resume,
	303	};
	304
	305	#define Z2_BATTERY_PM_OPS (&z2_battery_pm_ops)
	306
e3e8d1c9	307	#else
906649de	308	#define Z2_BATTERY_PM_OPS (NULL)
e3e8d1c9 MV	309	#endif
	310
	311	static const struct i2c_device_id z2_batt_id[] = {
	312	{ "aer915", 0 },
	313	{ }
	314	};
dcbc9169	315	MODULE_DEVICE_TABLE(i2c, z2_batt_id);
e3e8d1c9 MV	316
	317	static struct i2c_driver z2_batt_driver = {
	318	.driver = {
	319	.name = "z2-battery",
	320	.owner = THIS_MODULE,
906649de	321	.pm = Z2_BATTERY_PM_OPS
e3e8d1c9 MV	322	},
e3e8d1c9 MV	323	.probe = z2_batt_probe,
28ea73f4	324	.remove = z2_batt_remove,
e3e8d1c9 MV	325	.id_table = z2_batt_id,
e3e8d1c9 MV	326	};
5ff92e7a	327	module_i2c_driver(z2_batt_driver);
e3e8d1c9 MV	328
	329	MODULE_LICENSE("GPL");
	330	MODULE_AUTHOR("Peter Edwards <sweetlilmre@gmail.com>");
	331	MODULE_DESCRIPTION("Zipit Z2 battery driver");