drivers/power/supply/wm97xx_battery.c - linux - Git at Google

 /*
  * 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 (!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_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");
	/*
	* 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 (!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_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");