[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>
#include <linux/slab.h>

static struct work_struct bat_work;
static DEFINE_MUTEX(work_lock);
static int bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
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(dev_get_drvdata(bat_ps->dev->parent),
					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(dev_get_drvdata(bat_ps->dev->parent),
					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 device *dev)
{
	flush_work(&bat_work);
	return 0;
}

static int wm97xx_bat_resume(struct device *dev)
{
	schedule_work(&bat_work);
	return 0;
}

static const struct dev_pm_ops wm97xx_bat_pm_ops = {
	.suspend	= wm97xx_bat_suspend,
	.resume		= wm97xx_bat_resume,
};
#endif

static int 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 (!wmdata) {
		dev_err(&dev->dev, "No platform data supplied\n");
		return -EINVAL;
	}

	pdata = wmdata->batt_pdata;

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

	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, 0,
				"AC Detect", dev);
		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) {
		ret = -ENOMEM;
		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 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);
	}
	cancel_work_sync(&bat_work);
	power_supply_unregister(&bat_ps);
	kfree(prop);
	return 0;
}

static struct platform_driver wm97xx_bat_driver = {
	.driver	= {
		.name	= "wm97xx-battery",
		.owner	= THIS_MODULE,
#ifdef CONFIG_PM
		.pm	= &wm97xx_bat_pm_ops,
#endif
	},
	.probe		= wm97xx_bat_probe,
	.remove		= wm97xx_bat_remove,
};

module_platform_driver(wm97xx_bat_driver);

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>
5a0e3ad6	26	#include <linux/slab.h>
4e9687d9	27
4e9687d9	28	static struct work_struct bat_work;
daf22c3c	29	static DEFINE_MUTEX(work_lock);
4e9687d9	30	static int bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
4e9687d9 MV	31	static enum power_supply_property *prop;
	32
	33	static unsigned long wm97xx_read_bat(struct power_supply *bat_ps)
	34	{
b8bdc1d0 MV	35	struct wm97xx_pdata *wmdata = bat_ps->dev->parent->platform_data;
	36	struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
	37
38c7dc37	38	return wm97xx_read_aux_adc(dev_get_drvdata(bat_ps->dev->parent),
4e9687d9 MV	39	pdata->batt_aux) * pdata->batt_mult /
	40	pdata->batt_div;
	41	}
	42
	43	static unsigned long wm97xx_read_temp(struct power_supply *bat_ps)
	44	{
b8bdc1d0 MV	45	struct wm97xx_pdata *wmdata = bat_ps->dev->parent->platform_data;
	46	struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
	47
38c7dc37	48	return wm97xx_read_aux_adc(dev_get_drvdata(bat_ps->dev->parent),
4e9687d9 MV	49	pdata->temp_aux) * pdata->temp_mult /
	50	pdata->temp_div;
	51	}
	52
	53	static int wm97xx_bat_get_property(struct power_supply *bat_ps,
	54	enum power_supply_property psp,
	55	union power_supply_propval *val)
	56	{
b8bdc1d0 MV	57	struct wm97xx_pdata *wmdata = bat_ps->dev->parent->platform_data;
	58	struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
	59
4e9687d9 MV	60	switch (psp) {
	61	case POWER_SUPPLY_PROP_STATUS:
	62	val->intval = bat_status;
	63	break;
	64	case POWER_SUPPLY_PROP_TECHNOLOGY:
	65	val->intval = pdata->batt_tech;
	66	break;
	67	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
	68	if (pdata->batt_aux >= 0)
	69	val->intval = wm97xx_read_bat(bat_ps);
	70	else
	71	return -EINVAL;
	72	break;
	73	case POWER_SUPPLY_PROP_TEMP:
	74	if (pdata->temp_aux >= 0)
	75	val->intval = wm97xx_read_temp(bat_ps);
	76	else
	77	return -EINVAL;
	78	break;
	79	case POWER_SUPPLY_PROP_VOLTAGE_MAX:
	80	if (pdata->max_voltage >= 0)
	81	val->intval = pdata->max_voltage;
	82	else
	83	return -EINVAL;
	84	break;
	85	case POWER_SUPPLY_PROP_VOLTAGE_MIN:
	86	if (pdata->min_voltage >= 0)
	87	val->intval = pdata->min_voltage;
	88	else
	89	return -EINVAL;
	90	break;
	91	case POWER_SUPPLY_PROP_PRESENT:
	92	val->intval = 1;
	93	break;
	94	default:
	95	return -EINVAL;
	96	}
	97	return 0;
	98	}
	99
	100	static void wm97xx_bat_external_power_changed(struct power_supply *bat_ps)
	101	{
	102	schedule_work(&bat_work);
	103	}
	104
	105	static void wm97xx_bat_update(struct power_supply *bat_ps)
	106	{
	107	int old_status = bat_status;
b8bdc1d0 MV	108	struct wm97xx_pdata *wmdata = bat_ps->dev->parent->platform_data;
b8bdc1d0 MV	109	struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
4e9687d9 MV	110
	111	mutex_lock(&work_lock);
	112
	113	bat_status = (pdata->charge_gpio >= 0) ?
	114	(gpio_get_value(pdata->charge_gpio) ?
	115	POWER_SUPPLY_STATUS_DISCHARGING :
	116	POWER_SUPPLY_STATUS_CHARGING) :
	117	POWER_SUPPLY_STATUS_UNKNOWN;
	118
	119	if (old_status != bat_status) {
	120	pr_debug("%s: %i -> %i\n", bat_ps->name, old_status,
	121	bat_status);
	122	power_supply_changed(bat_ps);
	123	}
	124
	125	mutex_unlock(&work_lock);
	126	}
	127
	128	static struct power_supply bat_ps = {
	129	.type = POWER_SUPPLY_TYPE_BATTERY,
	130	.get_property = wm97xx_bat_get_property,
	131	.external_power_changed = wm97xx_bat_external_power_changed,
	132	.use_for_apm = 1,
	133	};
	134
	135	static void wm97xx_bat_work(struct work_struct *work)
	136	{
	137	wm97xx_bat_update(&bat_ps);
	138	}
	139
7c87942a MV	140	static irqreturn_t wm97xx_chrg_irq(int irq, void *data)
	141	{
	142	schedule_work(&bat_work);
	143	return IRQ_HANDLED;
	144	}
	145
4e9687d9	146	#ifdef CONFIG_PM
83a8af0d	147	static int wm97xx_bat_suspend(struct device *dev)
4e9687d9	148	{
43829731	149	flush_work(&bat_work);
4e9687d9 MV	150	return 0;
	151	}
	152
83a8af0d	153	static int wm97xx_bat_resume(struct device *dev)
4e9687d9 MV	154	{
	155	schedule_work(&bat_work);
	156	return 0;
	157	}
83a8af0d	158
47145210	159	static const struct dev_pm_ops wm97xx_bat_pm_ops = {
83a8af0d MV	160	.suspend = wm97xx_bat_suspend,
	161	.resume = wm97xx_bat_resume,
	162	};
4e9687d9 MV	163	#endif
4e9687d9 MV	164
c8afa640	165	static int wm97xx_bat_probe(struct platform_device *dev)
4e9687d9 MV	166	{
	167	int ret = 0;
	168	int props = 1; /* POWER_SUPPLY_PROP_PRESENT */
	169	int i = 0;
b8bdc1d0 MV	170	struct wm97xx_pdata *wmdata = dev->dev.platform_data;
	171	struct wm97xx_batt_pdata *pdata;
	172
12b336a8 MB	173	if (!wmdata) {
	174	dev_err(&dev->dev, "No platform data supplied\n");
	175	return -EINVAL;
	176	}
	177
	178	pdata = wmdata->batt_pdata;
4e9687d9 MV	179
	180	if (dev->id != -1)
	181	return -EINVAL;
	182
4e9687d9	183	if (!pdata) {
b8bdc1d0	184	dev_err(&dev->dev, "No platform_data supplied\n");
4e9687d9 MV	185	return -EINVAL;
	186	}
	187
7c87942a	188	if (gpio_is_valid(pdata->charge_gpio)) {
4e9687d9 MV	189	ret = gpio_request(pdata->charge_gpio, "BATT CHRG");
	190	if (ret)
	191	goto err;
	192	ret = gpio_direction_input(pdata->charge_gpio);
7c87942a MV	193	if (ret)
	194	goto err2;
	195	ret = request_irq(gpio_to_irq(pdata->charge_gpio),
3b176b25	196	wm97xx_chrg_irq, 0,
f8d94eb7	197	"AC Detect", dev);
4e9687d9 MV	198	if (ret)
	199	goto err2;
	200	props++; /* POWER_SUPPLY_PROP_STATUS */
	201	}
	202
	203	if (pdata->batt_tech >= 0)
	204	props++; /* POWER_SUPPLY_PROP_TECHNOLOGY */
	205	if (pdata->temp_aux >= 0)
	206	props++; /* POWER_SUPPLY_PROP_TEMP */
	207	if (pdata->batt_aux >= 0)
	208	props++; /* POWER_SUPPLY_PROP_VOLTAGE_NOW */
	209	if (pdata->max_voltage >= 0)
	210	props++; /* POWER_SUPPLY_PROP_VOLTAGE_MAX */
	211	if (pdata->min_voltage >= 0)
	212	props++; /* POWER_SUPPLY_PROP_VOLTAGE_MIN */
	213
	214	prop = kzalloc(props * sizeof(*prop), GFP_KERNEL);
588d4f0b JL	215	if (!prop) {
588d4f0b JL	216	ret = -ENOMEM;
7c87942a	217	goto err3;
588d4f0b	218	}
4e9687d9 MV	219
	220	prop[i++] = POWER_SUPPLY_PROP_PRESENT;
	221	if (pdata->charge_gpio >= 0)
	222	prop[i++] = POWER_SUPPLY_PROP_STATUS;
	223	if (pdata->batt_tech >= 0)
	224	prop[i++] = POWER_SUPPLY_PROP_TECHNOLOGY;
	225	if (pdata->temp_aux >= 0)
	226	prop[i++] = POWER_SUPPLY_PROP_TEMP;
	227	if (pdata->batt_aux >= 0)
	228	prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_NOW;
	229	if (pdata->max_voltage >= 0)
	230	prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MAX;
	231	if (pdata->min_voltage >= 0)
	232	prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MIN;
	233
	234	INIT_WORK(&bat_work, wm97xx_bat_work);
	235
	236	if (!pdata->batt_name) {
	237	dev_info(&dev->dev, "Please consider setting proper battery "
	238	"name in platform definition file, falling "
	239	"back to name \"wm97xx-batt\"\n");
	240	bat_ps.name = "wm97xx-batt";
	241	} else
	242	bat_ps.name = pdata->batt_name;
	243
	244	bat_ps.properties = prop;
	245	bat_ps.num_properties = props;
	246
	247	ret = power_supply_register(&dev->dev, &bat_ps);
	248	if (!ret)
	249	schedule_work(&bat_work);
	250	else
7c87942a	251	goto err4;
4e9687d9 MV	252
4e9687d9 MV	253	return 0;
7c87942a	254	err4:
4e9687d9	255	kfree(prop);
7c87942a MV	256	err3:
	257	if (gpio_is_valid(pdata->charge_gpio))
	258	free_irq(gpio_to_irq(pdata->charge_gpio), dev);
4e9687d9	259	err2:
7c87942a MV	260	if (gpio_is_valid(pdata->charge_gpio))
7c87942a MV	261	gpio_free(pdata->charge_gpio);
4e9687d9 MV	262	err:
	263	return ret;
	264	}
	265
415ec69f	266	static int wm97xx_bat_remove(struct platform_device *dev)
4e9687d9	267	{
b8bdc1d0 MV	268	struct wm97xx_pdata *wmdata = dev->dev.platform_data;
	269	struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
	270
7c87942a MV	271	if (pdata && gpio_is_valid(pdata->charge_gpio)) {
7c87942a MV	272	free_irq(gpio_to_irq(pdata->charge_gpio), dev);
4e9687d9	273	gpio_free(pdata->charge_gpio);
7c87942a	274	}
bc51e7ff	275	cancel_work_sync(&bat_work);
4e9687d9 MV	276	power_supply_unregister(&bat_ps);
	277	kfree(prop);
	278	return 0;
	279	}
	280
	281	static struct platform_driver wm97xx_bat_driver = {
	282	.driver = {
	283	.name = "wm97xx-battery",
	284	.owner = THIS_MODULE,
83a8af0d MV	285	#ifdef CONFIG_PM
	286	.pm = &wm97xx_bat_pm_ops,
	287	#endif
4e9687d9 MV	288	},
4e9687d9 MV	289	.probe = wm97xx_bat_probe,
28ea73f4	290	.remove = wm97xx_bat_remove,
4e9687d9 MV	291	};
4e9687d9 MV	292
300bac7f	293	module_platform_driver(wm97xx_bat_driver);
4e9687d9 MV	294
	295	MODULE_LICENSE("GPL");
	296	MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
	297	MODULE_DESCRIPTION("WM97xx battery driver");