[linux-2.6-block.git] / drivers / power / supply / 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_batt_pdata *pdata = power_supply_get_drvdata(bat_ps);

	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_batt_pdata *pdata = power_supply_get_drvdata(bat_ps);

	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_batt_pdata *pdata = power_supply_get_drvdata(bat_ps);

	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_batt_pdata *pdata = power_supply_get_drvdata(bat_ps);

	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->desc->name, old_status,
					bat_status);
		power_supply_changed(bat_ps);
	}

	mutex_unlock(&work_lock);
}

static struct power_supply *bat_psy;
static struct power_supply_desc bat_psy_desc = {
	.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_psy);
}

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_batt_pdata *pdata = dev->dev.platform_data;
	struct power_supply_config cfg = {};

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

	cfg.drv_data = pdata;

	if (dev->id != -1)
		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 = kcalloc(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_psy_desc.name = "wm97xx-batt";
	} else
		bat_psy_desc.name = pdata->batt_name;

	bat_psy_desc.properties = prop;
	bat_psy_desc.num_properties = props;

	bat_psy = power_supply_register(&dev->dev, &bat_psy_desc, &cfg);
	if (!IS_ERR(bat_psy)) {
		schedule_work(&bat_work);
	} else {
		ret = PTR_ERR(bat_psy);
		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_batt_pdata *pdata = dev->dev.platform_data;

	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_psy);
	kfree(prop);
	return 0;
}

static struct platform_driver wm97xx_bat_driver = {
	.driver	= {
		.name	= "wm97xx-battery",
#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	1	/*
4e9687d9 MV	2	* Battery measurement code for WM97xx
	3	*
	4	* based on tosa_battery.c
	5	*
	6	* Copyright (C) 2008 Marek Vasut <marek.vasut@gmail.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*
	12	*/
	13
	14	#include <linux/init.h>
	15	#include <linux/kernel.h>
	16	#include <linux/module.h>
	17	#include <linux/platform_device.h>
	18	#include <linux/power_supply.h>
	19	#include <linux/wm97xx.h>
	20	#include <linux/spinlock.h>
	21	#include <linux/interrupt.h>
	22	#include <linux/gpio.h>
7c87942a	23	#include <linux/irq.h>
5a0e3ad6	24	#include <linux/slab.h>
4e9687d9	25
4e9687d9	26	static struct work_struct bat_work;
daf22c3c	27	static DEFINE_MUTEX(work_lock);
4e9687d9	28	static int bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
4e9687d9 MV	29	static enum power_supply_property *prop;
	30
	31	static unsigned long wm97xx_read_bat(struct power_supply *bat_ps)
	32	{
6480af49	33	struct wm97xx_batt_pdata *pdata = power_supply_get_drvdata(bat_ps);
b8bdc1d0	34
297d716f	35	return wm97xx_read_aux_adc(dev_get_drvdata(bat_ps->dev.parent),
4e9687d9 MV	36	pdata->batt_aux) * pdata->batt_mult /
	37	pdata->batt_div;
	38	}
	39
	40	static unsigned long wm97xx_read_temp(struct power_supply *bat_ps)
	41	{
6480af49	42	struct wm97xx_batt_pdata *pdata = power_supply_get_drvdata(bat_ps);
b8bdc1d0	43
297d716f	44	return wm97xx_read_aux_adc(dev_get_drvdata(bat_ps->dev.parent),
4e9687d9 MV	45	pdata->temp_aux) * pdata->temp_mult /
	46	pdata->temp_div;
	47	}
	48
	49	static int wm97xx_bat_get_property(struct power_supply *bat_ps,
	50	enum power_supply_property psp,
	51	union power_supply_propval *val)
	52	{
6480af49	53	struct wm97xx_batt_pdata *pdata = power_supply_get_drvdata(bat_ps);
b8bdc1d0	54
4e9687d9 MV	55	switch (psp) {
	56	case POWER_SUPPLY_PROP_STATUS:
	57	val->intval = bat_status;
	58	break;
	59	case POWER_SUPPLY_PROP_TECHNOLOGY:
	60	val->intval = pdata->batt_tech;
	61	break;
	62	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
	63	if (pdata->batt_aux >= 0)
	64	val->intval = wm97xx_read_bat(bat_ps);
	65	else
	66	return -EINVAL;
	67	break;
	68	case POWER_SUPPLY_PROP_TEMP:
	69	if (pdata->temp_aux >= 0)
	70	val->intval = wm97xx_read_temp(bat_ps);
	71	else
	72	return -EINVAL;
	73	break;
	74	case POWER_SUPPLY_PROP_VOLTAGE_MAX:
	75	if (pdata->max_voltage >= 0)
	76	val->intval = pdata->max_voltage;
	77	else
	78	return -EINVAL;
	79	break;
	80	case POWER_SUPPLY_PROP_VOLTAGE_MIN:
	81	if (pdata->min_voltage >= 0)
	82	val->intval = pdata->min_voltage;
	83	else
	84	return -EINVAL;
	85	break;
	86	case POWER_SUPPLY_PROP_PRESENT:
	87	val->intval = 1;
	88	break;
	89	default:
	90	return -EINVAL;
	91	}
	92	return 0;
	93	}
	94
	95	static void wm97xx_bat_external_power_changed(struct power_supply *bat_ps)
	96	{
	97	schedule_work(&bat_work);
	98	}
	99
	100	static void wm97xx_bat_update(struct power_supply *bat_ps)
	101	{
	102	int old_status = bat_status;
6480af49	103	struct wm97xx_batt_pdata *pdata = power_supply_get_drvdata(bat_ps);
4e9687d9 MV	104
	105	mutex_lock(&work_lock);
	106
	107	bat_status = (pdata->charge_gpio >= 0) ?
	108	(gpio_get_value(pdata->charge_gpio) ?
	109	POWER_SUPPLY_STATUS_DISCHARGING :
	110	POWER_SUPPLY_STATUS_CHARGING) :
	111	POWER_SUPPLY_STATUS_UNKNOWN;
	112
	113	if (old_status != bat_status) {
297d716f	114	pr_debug("%s: %i -> %i\n", bat_ps->desc->name, old_status,
4e9687d9 MV	115	bat_status);
	116	power_supply_changed(bat_ps);
	117	}
	118
	119	mutex_unlock(&work_lock);
	120	}
	121
297d716f KK	122	static struct power_supply *bat_psy;
297d716f KK	123	static struct power_supply_desc bat_psy_desc = {
4e9687d9 MV	124	.type = POWER_SUPPLY_TYPE_BATTERY,
	125	.get_property = wm97xx_bat_get_property,
	126	.external_power_changed = wm97xx_bat_external_power_changed,
	127	.use_for_apm = 1,
	128	};
	129
	130	static void wm97xx_bat_work(struct work_struct *work)
	131	{
297d716f	132	wm97xx_bat_update(bat_psy);
4e9687d9 MV	133	}
4e9687d9 MV	134
7c87942a MV	135	static irqreturn_t wm97xx_chrg_irq(int irq, void *data)
	136	{
	137	schedule_work(&bat_work);
	138	return IRQ_HANDLED;
	139	}
	140
4e9687d9	141	#ifdef CONFIG_PM
83a8af0d	142	static int wm97xx_bat_suspend(struct device *dev)
4e9687d9	143	{
43829731	144	flush_work(&bat_work);
4e9687d9 MV	145	return 0;
	146	}
	147
83a8af0d	148	static int wm97xx_bat_resume(struct device *dev)
4e9687d9 MV	149	{
	150	schedule_work(&bat_work);
	151	return 0;
	152	}
83a8af0d	153
47145210	154	static const struct dev_pm_ops wm97xx_bat_pm_ops = {
83a8af0d MV	155	.suspend = wm97xx_bat_suspend,
	156	.resume = wm97xx_bat_resume,
	157	};
4e9687d9 MV	158	#endif
4e9687d9 MV	159
c8afa640	160	static int wm97xx_bat_probe(struct platform_device *dev)
4e9687d9 MV	161	{
	162	int ret = 0;
	163	int props = 1; /* POWER_SUPPLY_PROP_PRESENT */
	164	int i = 0;
6480af49 RJ	165	struct wm97xx_batt_pdata *pdata = dev->dev.platform_data;
6480af49 RJ	166	struct power_supply_config cfg = {};
b8bdc1d0	167
6480af49	168	if (!pdata) {
12b336a8 MB	169	dev_err(&dev->dev, "No platform data supplied\n");
	170	return -EINVAL;
	171	}
	172
6480af49	173	cfg.drv_data = pdata;
4e9687d9 MV	174
	175	if (dev->id != -1)
	176	return -EINVAL;
	177
7c87942a	178	if (gpio_is_valid(pdata->charge_gpio)) {
4e9687d9 MV	179	ret = gpio_request(pdata->charge_gpio, "BATT CHRG");
	180	if (ret)
	181	goto err;
	182	ret = gpio_direction_input(pdata->charge_gpio);
7c87942a MV	183	if (ret)
	184	goto err2;
	185	ret = request_irq(gpio_to_irq(pdata->charge_gpio),
3b176b25	186	wm97xx_chrg_irq, 0,
f8d94eb7	187	"AC Detect", dev);
4e9687d9 MV	188	if (ret)
	189	goto err2;
	190	props++; /* POWER_SUPPLY_PROP_STATUS */
	191	}
	192
	193	if (pdata->batt_tech >= 0)
	194	props++; /* POWER_SUPPLY_PROP_TECHNOLOGY */
	195	if (pdata->temp_aux >= 0)
	196	props++; /* POWER_SUPPLY_PROP_TEMP */
	197	if (pdata->batt_aux >= 0)
	198	props++; /* POWER_SUPPLY_PROP_VOLTAGE_NOW */
	199	if (pdata->max_voltage >= 0)
	200	props++; /* POWER_SUPPLY_PROP_VOLTAGE_MAX */
	201	if (pdata->min_voltage >= 0)
	202	props++; /* POWER_SUPPLY_PROP_VOLTAGE_MIN */
	203
6396bb22	204	prop = kcalloc(props, sizeof(*prop), GFP_KERNEL);
588d4f0b JL	205	if (!prop) {
588d4f0b JL	206	ret = -ENOMEM;
7c87942a	207	goto err3;
588d4f0b	208	}
4e9687d9 MV	209
	210	prop[i++] = POWER_SUPPLY_PROP_PRESENT;
	211	if (pdata->charge_gpio >= 0)
	212	prop[i++] = POWER_SUPPLY_PROP_STATUS;
	213	if (pdata->batt_tech >= 0)
	214	prop[i++] = POWER_SUPPLY_PROP_TECHNOLOGY;
	215	if (pdata->temp_aux >= 0)
	216	prop[i++] = POWER_SUPPLY_PROP_TEMP;
	217	if (pdata->batt_aux >= 0)
	218	prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_NOW;
	219	if (pdata->max_voltage >= 0)
	220	prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MAX;
	221	if (pdata->min_voltage >= 0)
	222	prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MIN;
	223
	224	INIT_WORK(&bat_work, wm97xx_bat_work);
	225
	226	if (!pdata->batt_name) {
	227	dev_info(&dev->dev, "Please consider setting proper battery "
	228	"name in platform definition file, falling "
	229	"back to name \"wm97xx-batt\"\n");
297d716f	230	bat_psy_desc.name = "wm97xx-batt";
4e9687d9	231	} else
297d716f	232	bat_psy_desc.name = pdata->batt_name;
4e9687d9	233
297d716f KK	234	bat_psy_desc.properties = prop;
297d716f KK	235	bat_psy_desc.num_properties = props;
4e9687d9	236
6480af49	237	bat_psy = power_supply_register(&dev->dev, &bat_psy_desc, &cfg);
297d716f	238	if (!IS_ERR(bat_psy)) {
4e9687d9	239	schedule_work(&bat_work);
297d716f KK	240	} else {
297d716f KK	241	ret = PTR_ERR(bat_psy);
7c87942a	242	goto err4;
297d716f	243	}
4e9687d9 MV	244
4e9687d9 MV	245	return 0;
7c87942a	246	err4:
4e9687d9	247	kfree(prop);
7c87942a MV	248	err3:
	249	if (gpio_is_valid(pdata->charge_gpio))
	250	free_irq(gpio_to_irq(pdata->charge_gpio), dev);
4e9687d9	251	err2:
7c87942a MV	252	if (gpio_is_valid(pdata->charge_gpio))
7c87942a MV	253	gpio_free(pdata->charge_gpio);
4e9687d9 MV	254	err:
	255	return ret;
	256	}
	257
415ec69f	258	static int wm97xx_bat_remove(struct platform_device *dev)
4e9687d9	259	{
6480af49	260	struct wm97xx_batt_pdata *pdata = dev->dev.platform_data;
b8bdc1d0	261
7c87942a MV	262	if (pdata && gpio_is_valid(pdata->charge_gpio)) {
7c87942a MV	263	free_irq(gpio_to_irq(pdata->charge_gpio), dev);
4e9687d9	264	gpio_free(pdata->charge_gpio);
7c87942a	265	}
bc51e7ff	266	cancel_work_sync(&bat_work);
297d716f	267	power_supply_unregister(bat_psy);
4e9687d9 MV	268	kfree(prop);
	269	return 0;
	270	}
	271
	272	static struct platform_driver wm97xx_bat_driver = {
	273	.driver = {
	274	.name = "wm97xx-battery",
83a8af0d MV	275	#ifdef CONFIG_PM
	276	.pm = &wm97xx_bat_pm_ops,
	277	#endif
4e9687d9 MV	278	},
4e9687d9 MV	279	.probe = wm97xx_bat_probe,
28ea73f4	280	.remove = wm97xx_bat_remove,
4e9687d9 MV	281	};
4e9687d9 MV	282
300bac7f	283	module_platform_driver(wm97xx_bat_driver);
4e9687d9 MV	284
	285	MODULE_LICENSE("GPL");
	286	MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
	287	MODULE_DESCRIPTION("WM97xx battery driver");