[GitHub/mt8127/android_kernel_alcatel_ttab.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 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 = container_of(batt_ps, struct z2_charger,
						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 = container_of(batt_ps, struct z2_charger,
						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.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.name = Z2_DEFAULT_NAME;
	} else
		charger->batt_ps.name = info->batt_name;

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

	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);

	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);

	ret = power_supply_register(&client->dev, &charger->batt_ps);
	if (ret)
		goto err4;

	schedule_work(&charger->bat_work);

	return 0;

err4:
	kfree(charger->batt_ps.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.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 {
	24	struct z2_battery_info *info;
	25	int bat_status;
	26	struct i2c_client *client;
	27	struct power_supply batt_ps;
	28	struct mutex work_lock;
	29	struct work_struct bat_work;
	30	};
	31
	32	static unsigned long z2_read_bat(struct z2_charger *charger)
	33	{
	34	int data;
	35	data = i2c_smbus_read_byte_data(charger->client,
	36	charger->info->batt_I2C_reg);
	37	if (data < 0)
	38	return 0;
	39
	40	return data * charger->info->batt_mult / charger->info->batt_div;
	41	}
	42
	43	static int z2_batt_get_property(struct power_supply *batt_ps,
	44	enum power_supply_property psp,
	45	union power_supply_propval *val)
	46	{
	47	struct z2_charger *charger = container_of(batt_ps, struct z2_charger,
	48	batt_ps);
	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	{
88	struct z2_charger *charger = container_of(batt_ps, struct z2_charger,
89	batt_ps);
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) {
109	pr_debug("%s: %i -> %i\n", charger->batt_ps.name, old_status,
110	charger->bat_status);
111	power_supply_changed(&charger->batt_ps);
112	}
113
114	mutex_unlock(&charger->work_lock);
115	}
116
117	static void z2_batt_work(struct work_struct *work)
118	{
119	struct z2_charger *charger;
120	charger = container_of(work, struct z2_charger, bat_work);
121	z2_batt_update(charger);
122	}
123
124	static irqreturn_t z2_charge_switch_irq(int irq, void *devid)
125	{
126	struct z2_charger *charger = devid;
127	schedule_work(&charger->bat_work);
128	return IRQ_HANDLED;
129	}
130
131	static int z2_batt_ps_init(struct z2_charger *charger, int props)
132	{
133	int i = 0;
134	enum power_supply_property *prop;
135	struct z2_battery_info *info = charger->info;
136
a223246f VK	137	if (info->charge_gpio >= 0)
a223246f VK	138	props++; /* POWER_SUPPLY_PROP_STATUS */
e3e8d1c9 MV	139	if (info->batt_tech >= 0)
	140	props++; /* POWER_SUPPLY_PROP_TECHNOLOGY */
	141	if (info->batt_I2C_reg >= 0)
	142	props++; /* POWER_SUPPLY_PROP_VOLTAGE_NOW */
	143	if (info->max_voltage >= 0)
	144	props++; /* POWER_SUPPLY_PROP_VOLTAGE_MAX */
	145	if (info->min_voltage >= 0)
	146	props++; /* POWER_SUPPLY_PROP_VOLTAGE_MIN */
	147
	148	prop = kzalloc(props * sizeof(*prop), GFP_KERNEL);
	149	if (!prop)
	150	return -ENOMEM;
	151
	152	prop[i++] = POWER_SUPPLY_PROP_PRESENT;
	153	if (info->charge_gpio >= 0)
	154	prop[i++] = POWER_SUPPLY_PROP_STATUS;
	155	if (info->batt_tech >= 0)
	156	prop[i++] = POWER_SUPPLY_PROP_TECHNOLOGY;
	157	if (info->batt_I2C_reg >= 0)
	158	prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_NOW;
	159	if (info->max_voltage >= 0)
	160	prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MAX;
	161	if (info->min_voltage >= 0)
	162	prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MIN;
	163
	164	if (!info->batt_name) {
	165	dev_info(&charger->client->dev,
	166	"Please consider setting proper battery "
	167	"name in platform definition file, falling "
	168	"back to name \" Z2_DEFAULT_NAME \"\n");
	169	charger->batt_ps.name = Z2_DEFAULT_NAME;
	170	} else
	171	charger->batt_ps.name = info->batt_name;
	172
	173	charger->batt_ps.properties = prop;
	174	charger->batt_ps.num_properties = props;
	175	charger->batt_ps.type = POWER_SUPPLY_TYPE_BATTERY;
	176	charger->batt_ps.get_property = z2_batt_get_property;
	177	charger->batt_ps.external_power_changed = z2_batt_ext_power_changed;
	178	charger->batt_ps.use_for_apm = 1;
	179
	180	return 0;
	181	}
	182
c8afa640	183	static int z2_batt_probe(struct i2c_client *client,
e3e8d1c9 MV	184	const struct i2c_device_id *id)
	185	{
	186	int ret = 0;
	187	int props = 1; /* POWER_SUPPLY_PROP_PRESENT */
	188	struct z2_charger *charger;
	189	struct z2_battery_info *info = client->dev.platform_data;
	190
	191	if (info == NULL) {
	192	dev_err(&client->dev,
	193	"Please set platform device platform_data"
	194	" to a valid z2_battery_info pointer!\n");
	195	return -EINVAL;
	196	}
	197
	198	charger = kzalloc(sizeof(*charger), GFP_KERNEL);
	199	if (charger == NULL)
	200	return -ENOMEM;
	201
	202	charger->bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
	203	charger->info = info;
	204	charger->client = client;
	205	i2c_set_clientdata(client, charger);
	206
	207	mutex_init(&charger->work_lock);
	208
	209	if (info->charge_gpio >= 0 && gpio_is_valid(info->charge_gpio)) {
	210	ret = gpio_request(info->charge_gpio, "BATT CHRG");
	211	if (ret)
	212	goto err;
	213
	214	ret = gpio_direction_input(info->charge_gpio);
	215	if (ret)
	216	goto err2;
	217
dced35ae TG	218	irq_set_irq_type(gpio_to_irq(info->charge_gpio),
dced35ae TG	219	IRQ_TYPE_EDGE_BOTH);
e3e8d1c9	220	ret = request_irq(gpio_to_irq(info->charge_gpio),
3b176b25	221	z2_charge_switch_irq, 0,
e3e8d1c9 MV	222	"AC Detect", charger);
	223	if (ret)
	224	goto err3;
	225	}
	226
	227	ret = z2_batt_ps_init(charger, props);
	228	if (ret)
	229	goto err3;
	230
	231	INIT_WORK(&charger->bat_work, z2_batt_work);
	232
	233	ret = power_supply_register(&client->dev, &charger->batt_ps);
	234	if (ret)
	235	goto err4;
	236
	237	schedule_work(&charger->bat_work);
	238
	239	return 0;
	240
	241	err4:
	242	kfree(charger->batt_ps.properties);
	243	err3:
	244	if (info->charge_gpio >= 0 && gpio_is_valid(info->charge_gpio))
	245	free_irq(gpio_to_irq(info->charge_gpio), charger);
	246	err2:
	247	if (info->charge_gpio >= 0 && gpio_is_valid(info->charge_gpio))
	248	gpio_free(info->charge_gpio);
	249	err:
	250	kfree(charger);
	251	return ret;
	252	}
	253
415ec69f	254	static int z2_batt_remove(struct i2c_client *client)
e3e8d1c9 MV	255	{
	256	struct z2_charger *charger = i2c_get_clientdata(client);
	257	struct z2_battery_info *info = charger->info;
	258
bc51e7ff	259	cancel_work_sync(&charger->bat_work);
e3e8d1c9 MV	260	power_supply_unregister(&charger->batt_ps);
	261
	262	kfree(charger->batt_ps.properties);
	263	if (info->charge_gpio >= 0 && gpio_is_valid(info->charge_gpio)) {
	264	free_irq(gpio_to_irq(info->charge_gpio), charger);
	265	gpio_free(info->charge_gpio);
	266	}
	267
	268	kfree(charger);
	269
	270	return 0;
	271	}
	272
	273	#ifdef CONFIG_PM
906649de	274	static int z2_batt_suspend(struct device *dev)
e3e8d1c9	275	{
906649de	276	struct i2c_client *client = to_i2c_client(dev);
bc51e7ff TH	277	struct z2_charger *charger = i2c_get_clientdata(client);
bc51e7ff TH	278
43829731	279	flush_work(&charger->bat_work);
e3e8d1c9 MV	280	return 0;
	281	}
	282
906649de	283	static int z2_batt_resume(struct device *dev)
e3e8d1c9	284	{
906649de	285	struct i2c_client *client = to_i2c_client(dev);
e3e8d1c9 MV	286	struct z2_charger *charger = i2c_get_clientdata(client);
	287
	288	schedule_work(&charger->bat_work);
	289	return 0;
	290	}
906649de MV	291
	292	static const struct dev_pm_ops z2_battery_pm_ops = {
	293	.suspend = z2_batt_suspend,
	294	.resume = z2_batt_resume,
	295	};
	296
	297	#define Z2_BATTERY_PM_OPS (&z2_battery_pm_ops)
	298
e3e8d1c9	299	#else
906649de	300	#define Z2_BATTERY_PM_OPS (NULL)
e3e8d1c9 MV	301	#endif
	302
	303	static const struct i2c_device_id z2_batt_id[] = {
	304	{ "aer915", 0 },
	305	{ }
	306	};
dcbc9169	307	MODULE_DEVICE_TABLE(i2c, z2_batt_id);
e3e8d1c9 MV	308
	309	static struct i2c_driver z2_batt_driver = {
	310	.driver = {
	311	.name = "z2-battery",
	312	.owner = THIS_MODULE,
906649de	313	.pm = Z2_BATTERY_PM_OPS
e3e8d1c9 MV	314	},
e3e8d1c9 MV	315	.probe = z2_batt_probe,
28ea73f4	316	.remove = z2_batt_remove,
e3e8d1c9 MV	317	.id_table = z2_batt_id,
e3e8d1c9 MV	318	};
5ff92e7a	319	module_i2c_driver(z2_batt_driver);
e3e8d1c9 MV	320
	321	MODULE_LICENSE("GPL");
	322	MODULE_AUTHOR("Peter Edwards <sweetlilmre@gmail.com>");
	323	MODULE_DESCRIPTION("Zipit Z2 battery driver");