[deliverable/linux.git] / drivers / power / wm97xx_battery.c

/*
 * linux/drivers/power/wm97xx_battery.c
 *
 * Battery measurement code for WM97xx
 *
 * based on tosa_battery.c
 *
 * Copyright (C) 2008 Marek Vasut <marek.vasut@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/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/wm97xx.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/gpio.h>
#include <linux/irq.h>

static DEFINE_MUTEX(bat_lock);
static struct work_struct bat_work;
struct mutex work_lock;
static int bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
static struct wm97xx_batt_info *gpdata;
static enum power_supply_property *prop;

static unsigned long wm97xx_read_bat(struct power_supply *bat_ps)
{
	struct wm97xx_pdata *wmdata = bat_ps->dev->parent->platform_data;
	struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;

	return wm97xx_read_aux_adc(bat_ps->dev->parent->driver_data,
					pdata->batt_aux) * pdata->batt_mult /
					pdata->batt_div;
}

static unsigned long wm97xx_read_temp(struct power_supply *bat_ps)
{
	struct wm97xx_pdata *wmdata = bat_ps->dev->parent->platform_data;
	struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;

	return wm97xx_read_aux_adc(bat_ps->dev->parent->driver_data,
					pdata->temp_aux) * pdata->temp_mult /
					pdata->temp_div;
}

static int wm97xx_bat_get_property(struct power_supply *bat_ps,
			    enum power_supply_property psp,
			    union power_supply_propval *val)
{
	struct wm97xx_pdata *wmdata = bat_ps->dev->parent->platform_data;
	struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;

	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
		val->intval = bat_status;
		break;
	case POWER_SUPPLY_PROP_TECHNOLOGY:
		val->intval = pdata->batt_tech;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
		if (pdata->batt_aux >= 0)
			val->intval = wm97xx_read_bat(bat_ps);
		else
			return -EINVAL;
		break;
	case POWER_SUPPLY_PROP_TEMP:
		if (pdata->temp_aux >= 0)
			val->intval = wm97xx_read_temp(bat_ps);
		else
			return -EINVAL;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_MAX:
		if (pdata->max_voltage >= 0)
			val->intval = pdata->max_voltage;
		else
			return -EINVAL;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_MIN:
		if (pdata->min_voltage >= 0)
			val->intval = pdata->min_voltage;
		else
			return -EINVAL;
		break;
	case POWER_SUPPLY_PROP_PRESENT:
		val->intval = 1;
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

static void wm97xx_bat_external_power_changed(struct power_supply *bat_ps)
{
	schedule_work(&bat_work);
}

static void wm97xx_bat_update(struct power_supply *bat_ps)
{
	int old_status = bat_status;
	struct wm97xx_pdata *wmdata = bat_ps->dev->parent->platform_data;
	struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;

	mutex_lock(&work_lock);

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

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

	mutex_unlock(&work_lock);
}

static struct power_supply bat_ps = {
	.type			= POWER_SUPPLY_TYPE_BATTERY,
	.get_property		= wm97xx_bat_get_property,
	.external_power_changed = wm97xx_bat_external_power_changed,
	.use_for_apm		= 1,
};

static void wm97xx_bat_work(struct work_struct *work)
{
	wm97xx_bat_update(&bat_ps);
}

static irqreturn_t wm97xx_chrg_irq(int irq, void *data)
{
	schedule_work(&bat_work);
	return IRQ_HANDLED;
}

#ifdef CONFIG_PM
static int wm97xx_bat_suspend(struct platform_device *dev, pm_message_t state)
{
	flush_scheduled_work();
	return 0;
}

static int wm97xx_bat_resume(struct platform_device *dev)
{
	schedule_work(&bat_work);
	return 0;
}
#else
#define wm97xx_bat_suspend NULL
#define wm97xx_bat_resume NULL
#endif

static int __devinit wm97xx_bat_probe(struct platform_device *dev)
{
	int ret = 0;
	int props = 1;	/* POWER_SUPPLY_PROP_PRESENT */
	int i = 0;
	struct wm97xx_pdata *wmdata = dev->dev.platform_data;
	struct wm97xx_batt_pdata *pdata;

	if (gpdata) {
		dev_err(&dev->dev, "Do not pass platform_data through "
			"wm97xx_bat_set_pdata!\n");
		return -EINVAL;
	} else
		pdata = wmdata->batt_pdata;

	if (dev->id != -1)
		return -EINVAL;

	mutex_init(&work_lock);

	if (!pdata) {
		dev_err(&dev->dev, "No platform_data supplied\n");
		return -EINVAL;
	}

	if (gpio_is_valid(pdata->charge_gpio)) {
		ret = gpio_request(pdata->charge_gpio, "BATT CHRG");
		if (ret)
			goto err;
		ret = gpio_direction_input(pdata->charge_gpio);
		if (ret)
			goto err2;
		ret = request_irq(gpio_to_irq(pdata->charge_gpio),
				wm97xx_chrg_irq, IRQF_DISABLED,
				"AC Detect", 0);
		if (ret)
			goto err2;
		props++;	/* POWER_SUPPLY_PROP_STATUS */
	}

	if (pdata->batt_tech >= 0)
		props++;	/* POWER_SUPPLY_PROP_TECHNOLOGY */
	if (pdata->temp_aux >= 0)
		props++;	/* POWER_SUPPLY_PROP_TEMP */
	if (pdata->batt_aux >= 0)
		props++;	/* POWER_SUPPLY_PROP_VOLTAGE_NOW */
	if (pdata->max_voltage >= 0)
		props++;	/* POWER_SUPPLY_PROP_VOLTAGE_MAX */
	if (pdata->min_voltage >= 0)
		props++;	/* POWER_SUPPLY_PROP_VOLTAGE_MIN */

	prop = kzalloc(props * sizeof(*prop), GFP_KERNEL);
	if (!prop)
		goto err3;

	prop[i++] = POWER_SUPPLY_PROP_PRESENT;
	if (pdata->charge_gpio >= 0)
		prop[i++] = POWER_SUPPLY_PROP_STATUS;
	if (pdata->batt_tech >= 0)
		prop[i++] = POWER_SUPPLY_PROP_TECHNOLOGY;
	if (pdata->temp_aux >= 0)
		prop[i++] = POWER_SUPPLY_PROP_TEMP;
	if (pdata->batt_aux >= 0)
		prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_NOW;
	if (pdata->max_voltage >= 0)
		prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MAX;
	if (pdata->min_voltage >= 0)
		prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MIN;

	INIT_WORK(&bat_work, wm97xx_bat_work);

	if (!pdata->batt_name) {
		dev_info(&dev->dev, "Please consider setting proper battery "
				"name in platform definition file, falling "
				"back to name \"wm97xx-batt\"\n");
		bat_ps.name = "wm97xx-batt";
	} else
		bat_ps.name = pdata->batt_name;

	bat_ps.properties = prop;
	bat_ps.num_properties = props;

	ret = power_supply_register(&dev->dev, &bat_ps);
	if (!ret)
		schedule_work(&bat_work);
	else
		goto err4;

	return 0;
err4:
	kfree(prop);
err3:
	if (gpio_is_valid(pdata->charge_gpio))
		free_irq(gpio_to_irq(pdata->charge_gpio), dev);
err2:
	if (gpio_is_valid(pdata->charge_gpio))
		gpio_free(pdata->charge_gpio);
err:
	return ret;
}

static int __devexit wm97xx_bat_remove(struct platform_device *dev)
{
	struct wm97xx_pdata *wmdata = dev->dev.platform_data;
	struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;

	if (pdata && gpio_is_valid(pdata->charge_gpio)) {
		free_irq(gpio_to_irq(pdata->charge_gpio), dev);
		gpio_free(pdata->charge_gpio);
	}
	flush_scheduled_work();
	power_supply_unregister(&bat_ps);
	kfree(prop);
	return 0;
}

static struct platform_driver wm97xx_bat_driver = {
	.driver	= {
		.name	= "wm97xx-battery",
		.owner	= THIS_MODULE,
	},
	.probe		= wm97xx_bat_probe,
	.remove		= __devexit_p(wm97xx_bat_remove),
	.suspend	= wm97xx_bat_suspend,
	.resume		= wm97xx_bat_resume,
};

static int __init wm97xx_bat_init(void)
{
	return platform_driver_register(&wm97xx_bat_driver);
}

static void __exit wm97xx_bat_exit(void)
{
	platform_driver_unregister(&wm97xx_bat_driver);
}

void wm97xx_bat_set_pdata(struct wm97xx_batt_info *data)
{
	gpdata = data;
}
EXPORT_SYMBOL_GPL(wm97xx_bat_set_pdata);

module_init(wm97xx_bat_init);
module_exit(wm97xx_bat_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
MODULE_DESCRIPTION("WM97xx battery driver");
Commit	Line	Data
4e9687d9 MV	1	/*
	2	* linux/drivers/power/wm97xx_battery.c
	3	*
	4	* Battery measurement code for WM97xx
	5	*
	6	* based on tosa_battery.c
	7	*
	8	* Copyright (C) 2008 Marek Vasut <marek.vasut@gmail.com>
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License version 2 as
	12	* published by the Free Software Foundation.
	13	*
	14	*/
	15
	16	#include <linux/init.h>
	17	#include <linux/kernel.h>
	18	#include <linux/module.h>
	19	#include <linux/platform_device.h>
	20	#include <linux/power_supply.h>
	21	#include <linux/wm97xx.h>
	22	#include <linux/spinlock.h>
	23	#include <linux/interrupt.h>
	24	#include <linux/gpio.h>
7c87942a	25	#include <linux/irq.h>
4e9687d9 MV	26
	27	static DEFINE_MUTEX(bat_lock);
	28	static struct work_struct bat_work;
	29	struct mutex work_lock;
	30	static int bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
b8bdc1d0	31	static struct wm97xx_batt_info *gpdata;
4e9687d9 MV	32	static enum power_supply_property *prop;
	33
	34	static unsigned long wm97xx_read_bat(struct power_supply *bat_ps)
	35	{
b8bdc1d0 MV	36	struct wm97xx_pdata *wmdata = bat_ps->dev->parent->platform_data;
	37	struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
	38
4e9687d9 MV	39	return wm97xx_read_aux_adc(bat_ps->dev->parent->driver_data,
	40	pdata->batt_aux) * pdata->batt_mult /
	41	pdata->batt_div;
	42	}
	43
	44	static unsigned long wm97xx_read_temp(struct power_supply *bat_ps)
	45	{
b8bdc1d0 MV	46	struct wm97xx_pdata *wmdata = bat_ps->dev->parent->platform_data;
	47	struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
	48
4e9687d9 MV	49	return wm97xx_read_aux_adc(bat_ps->dev->parent->driver_data,
	50	pdata->temp_aux) * pdata->temp_mult /
	51	pdata->temp_div;
	52	}
	53
	54	static int wm97xx_bat_get_property(struct power_supply *bat_ps,
	55	enum power_supply_property psp,
	56	union power_supply_propval *val)
	57	{
b8bdc1d0 MV	58	struct wm97xx_pdata *wmdata = bat_ps->dev->parent->platform_data;
	59	struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
	60
4e9687d9 MV	61	switch (psp) {
	62	case POWER_SUPPLY_PROP_STATUS:
	63	val->intval = bat_status;
	64	break;
	65	case POWER_SUPPLY_PROP_TECHNOLOGY:
	66	val->intval = pdata->batt_tech;
	67	break;
	68	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
	69	if (pdata->batt_aux >= 0)
	70	val->intval = wm97xx_read_bat(bat_ps);
	71	else
	72	return -EINVAL;
	73	break;
	74	case POWER_SUPPLY_PROP_TEMP:
	75	if (pdata->temp_aux >= 0)
	76	val->intval = wm97xx_read_temp(bat_ps);
	77	else
	78	return -EINVAL;
	79	break;
	80	case POWER_SUPPLY_PROP_VOLTAGE_MAX:
	81	if (pdata->max_voltage >= 0)
	82	val->intval = pdata->max_voltage;
	83	else
	84	return -EINVAL;
	85	break;
	86	case POWER_SUPPLY_PROP_VOLTAGE_MIN:
	87	if (pdata->min_voltage >= 0)
	88	val->intval = pdata->min_voltage;
	89	else
	90	return -EINVAL;
	91	break;
	92	case POWER_SUPPLY_PROP_PRESENT:
	93	val->intval = 1;
	94	break;
	95	default:
	96	return -EINVAL;
	97	}
	98	return 0;
	99	}
	100
	101	static void wm97xx_bat_external_power_changed(struct power_supply *bat_ps)
	102	{
	103	schedule_work(&bat_work);
	104	}
	105
	106	static void wm97xx_bat_update(struct power_supply *bat_ps)
	107	{
	108	int old_status = bat_status;
b8bdc1d0 MV	109	struct wm97xx_pdata *wmdata = bat_ps->dev->parent->platform_data;
b8bdc1d0 MV	110	struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
4e9687d9 MV	111
	112	mutex_lock(&work_lock);
	113
	114	bat_status = (pdata->charge_gpio >= 0) ?
	115	(gpio_get_value(pdata->charge_gpio) ?
	116	POWER_SUPPLY_STATUS_DISCHARGING :
	117	POWER_SUPPLY_STATUS_CHARGING) :
	118	POWER_SUPPLY_STATUS_UNKNOWN;
	119
	120	if (old_status != bat_status) {
	121	pr_debug("%s: %i -> %i\n", bat_ps->name, old_status,
	122	bat_status);
	123	power_supply_changed(bat_ps);
	124	}
	125
	126	mutex_unlock(&work_lock);
	127	}
	128
	129	static struct power_supply bat_ps = {
	130	.type = POWER_SUPPLY_TYPE_BATTERY,
	131	.get_property = wm97xx_bat_get_property,
	132	.external_power_changed = wm97xx_bat_external_power_changed,
	133	.use_for_apm = 1,
	134	};
	135
	136	static void wm97xx_bat_work(struct work_struct *work)
	137	{
	138	wm97xx_bat_update(&bat_ps);
	139	}
	140
7c87942a MV	141	static irqreturn_t wm97xx_chrg_irq(int irq, void *data)
	142	{
	143	schedule_work(&bat_work);
	144	return IRQ_HANDLED;
	145	}
	146
4e9687d9 MV	147	#ifdef CONFIG_PM
	148	static int wm97xx_bat_suspend(struct platform_device *dev, pm_message_t state)
	149	{
	150	flush_scheduled_work();
	151	return 0;
	152	}
	153
	154	static int wm97xx_bat_resume(struct platform_device *dev)
	155	{
	156	schedule_work(&bat_work);
	157	return 0;
	158	}
	159	#else
	160	#define wm97xx_bat_suspend NULL
	161	#define wm97xx_bat_resume NULL
	162	#endif
	163
	164	static int __devinit wm97xx_bat_probe(struct platform_device *dev)
	165	{
	166	int ret = 0;
	167	int props = 1; /* POWER_SUPPLY_PROP_PRESENT */
	168	int i = 0;
b8bdc1d0 MV	169	struct wm97xx_pdata *wmdata = dev->dev.platform_data;
	170	struct wm97xx_batt_pdata *pdata;
	171
	172	if (gpdata) {
	173	dev_err(&dev->dev, "Do not pass platform_data through "
	174	"wm97xx_bat_set_pdata!\n");
	175	return -EINVAL;
	176	} else
	177	pdata = wmdata->batt_pdata;
4e9687d9 MV	178
	179	if (dev->id != -1)
	180	return -EINVAL;
	181
	182	mutex_init(&work_lock);
	183
	184	if (!pdata) {
b8bdc1d0	185	dev_err(&dev->dev, "No platform_data supplied\n");
4e9687d9 MV	186	return -EINVAL;
	187	}
	188
7c87942a	189	if (gpio_is_valid(pdata->charge_gpio)) {
4e9687d9 MV	190	ret = gpio_request(pdata->charge_gpio, "BATT CHRG");
	191	if (ret)
	192	goto err;
	193	ret = gpio_direction_input(pdata->charge_gpio);
7c87942a MV	194	if (ret)
	195	goto err2;
	196	ret = request_irq(gpio_to_irq(pdata->charge_gpio),
	197	wm97xx_chrg_irq, IRQF_DISABLED,
	198	"AC Detect", 0);
4e9687d9 MV	199	if (ret)
	200	goto err2;
	201	props++; /* POWER_SUPPLY_PROP_STATUS */
	202	}
	203
	204	if (pdata->batt_tech >= 0)
	205	props++; /* POWER_SUPPLY_PROP_TECHNOLOGY */
	206	if (pdata->temp_aux >= 0)
	207	props++; /* POWER_SUPPLY_PROP_TEMP */
	208	if (pdata->batt_aux >= 0)
	209	props++; /* POWER_SUPPLY_PROP_VOLTAGE_NOW */
	210	if (pdata->max_voltage >= 0)
	211	props++; /* POWER_SUPPLY_PROP_VOLTAGE_MAX */
	212	if (pdata->min_voltage >= 0)
	213	props++; /* POWER_SUPPLY_PROP_VOLTAGE_MIN */
	214
	215	prop = kzalloc(props * sizeof(*prop), GFP_KERNEL);
	216	if (!prop)
7c87942a	217	goto err3;
4e9687d9 MV	218
	219	prop[i++] = POWER_SUPPLY_PROP_PRESENT;
	220	if (pdata->charge_gpio >= 0)
	221	prop[i++] = POWER_SUPPLY_PROP_STATUS;
	222	if (pdata->batt_tech >= 0)
	223	prop[i++] = POWER_SUPPLY_PROP_TECHNOLOGY;
	224	if (pdata->temp_aux >= 0)
	225	prop[i++] = POWER_SUPPLY_PROP_TEMP;
	226	if (pdata->batt_aux >= 0)
	227	prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_NOW;
	228	if (pdata->max_voltage >= 0)
	229	prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MAX;
	230	if (pdata->min_voltage >= 0)
	231	prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MIN;
	232
	233	INIT_WORK(&bat_work, wm97xx_bat_work);
	234
	235	if (!pdata->batt_name) {
	236	dev_info(&dev->dev, "Please consider setting proper battery "
	237	"name in platform definition file, falling "
	238	"back to name \"wm97xx-batt\"\n");
	239	bat_ps.name = "wm97xx-batt";
	240	} else
	241	bat_ps.name = pdata->batt_name;
	242
	243	bat_ps.properties = prop;
	244	bat_ps.num_properties = props;
	245
	246	ret = power_supply_register(&dev->dev, &bat_ps);
	247	if (!ret)
	248	schedule_work(&bat_work);
	249	else
7c87942a	250	goto err4;
4e9687d9 MV	251
4e9687d9 MV	252	return 0;
7c87942a	253	err4:
4e9687d9	254	kfree(prop);
7c87942a MV	255	err3:
	256	if (gpio_is_valid(pdata->charge_gpio))
	257	free_irq(gpio_to_irq(pdata->charge_gpio), dev);
4e9687d9	258	err2:
7c87942a MV	259	if (gpio_is_valid(pdata->charge_gpio))
7c87942a MV	260	gpio_free(pdata->charge_gpio);
4e9687d9 MV	261	err:
	262	return ret;
	263	}
	264
	265	static int __devexit wm97xx_bat_remove(struct platform_device *dev)
	266	{
b8bdc1d0 MV	267	struct wm97xx_pdata *wmdata = dev->dev.platform_data;
	268	struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
	269
7c87942a MV	270	if (pdata && gpio_is_valid(pdata->charge_gpio)) {
7c87942a MV	271	free_irq(gpio_to_irq(pdata->charge_gpio), dev);
4e9687d9	272	gpio_free(pdata->charge_gpio);
7c87942a	273	}
4e9687d9 MV	274	flush_scheduled_work();
	275	power_supply_unregister(&bat_ps);
	276	kfree(prop);
	277	return 0;
	278	}
	279
	280	static struct platform_driver wm97xx_bat_driver = {
	281	.driver = {
	282	.name = "wm97xx-battery",
	283	.owner = THIS_MODULE,
	284	},
	285	.probe = wm97xx_bat_probe,
	286	.remove = __devexit_p(wm97xx_bat_remove),
	287	.suspend = wm97xx_bat_suspend,
	288	.resume = wm97xx_bat_resume,
	289	};
	290
	291	static int __init wm97xx_bat_init(void)
	292	{
	293	return platform_driver_register(&wm97xx_bat_driver);
	294	}
	295
	296	static void __exit wm97xx_bat_exit(void)
	297	{
	298	platform_driver_unregister(&wm97xx_bat_driver);
	299	}
	300
b8bdc1d0	301	void wm97xx_bat_set_pdata(struct wm97xx_batt_info *data)
4e9687d9	302	{
b8bdc1d0	303	gpdata = data;
4e9687d9 MV	304	}
	305	EXPORT_SYMBOL_GPL(wm97xx_bat_set_pdata);
	306
	307	module_init(wm97xx_bat_init);
	308	module_exit(wm97xx_bat_exit);
	309
	310	MODULE_LICENSE("GPL");
	311	MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
	312	MODULE_DESCRIPTION("WM97xx battery driver");