drivers/power/supply/generic-adc-battery.c - linux-imx - Git at Google

 /*
  * Generic battery driver code using IIO
  * Copyright (C) 2012, Anish Kumar <anish198519851985@gmail.com>
  * based on jz4740-battery.c
  * based on s3c_adc_battery.c
  *
  * This file is subject to the terms and conditions of the GNU General Public
  * License.  See the file COPYING in the main directory of this archive for
  * more details.
  *
  */
 #include <linux/interrupt.h>
 #include <linux/platform_device.h>
 #include <linux/power_supply.h>
 #include <linux/gpio.h>
 #include <linux/err.h>
 #include <linux/timer.h>
 #include <linux/jiffies.h>
 #include <linux/errno.h>
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/iio/consumer.h>
 #include <linux/iio/types.h>
 #include <linux/power/generic-adc-battery.h>

 #define JITTER_DEFAULT 10 /* hope 10ms is enough */

 enum gab_chan_type {
 	GAB_VOLTAGE = 0,
 	GAB_CURRENT,
 	GAB_POWER,
 	GAB_MAX_CHAN_TYPE
 };

 /*
  * gab_chan_name suggests the standard channel names for commonly used
  * channel types.
  */
 static const char *const gab_chan_name[] = {
 	[GAB_VOLTAGE]	= "voltage",
 	[GAB_CURRENT]	= "current",
 	[GAB_POWER]		= "power",
 };

 struct gab {
 	struct power_supply		*psy;
 	struct power_supply_desc	psy_desc;
 	struct iio_channel	*channel[GAB_MAX_CHAN_TYPE];
 	struct gab_platform_data	*pdata;
 	struct delayed_work bat_work;
 	int	level;
 	int	status;
 	bool cable_plugged;
 };

 static struct gab *to_generic_bat(struct power_supply *psy)
 {
 	return power_supply_get_drvdata(psy);
 }

 static void gab_ext_power_changed(struct power_supply *psy)
 {
 	struct gab *adc_bat = to_generic_bat(psy);

 	schedule_delayed_work(&adc_bat->bat_work, msecs_to_jiffies(0));
 }

 static const enum power_supply_property gab_props[] = {
 	POWER_SUPPLY_PROP_STATUS,
 	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 	POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN,
 	POWER_SUPPLY_PROP_CHARGE_NOW,
 	POWER_SUPPLY_PROP_VOLTAGE_NOW,
 	POWER_SUPPLY_PROP_CURRENT_NOW,
 	POWER_SUPPLY_PROP_TECHNOLOGY,
 	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
 	POWER_SUPPLY_PROP_MODEL_NAME,
 };

 /*
  * This properties are set based on the received platform data and this
  * should correspond one-to-one with enum chan_type.
  */
 static const enum power_supply_property gab_dyn_props[] = {
 	POWER_SUPPLY_PROP_VOLTAGE_NOW,
 	POWER_SUPPLY_PROP_CURRENT_NOW,
 	POWER_SUPPLY_PROP_POWER_NOW,
 };

 static bool gab_charge_finished(struct gab *adc_bat)
 {
 	struct gab_platform_data *pdata = adc_bat->pdata;
 	bool ret = gpio_get_value(pdata->gpio_charge_finished);
 	bool inv = pdata->gpio_inverted;

 	if (!gpio_is_valid(pdata->gpio_charge_finished))
 		return false;
 	return ret ^ inv;
 }

 static int gab_get_status(struct gab *adc_bat)
 {
 	struct gab_platform_data *pdata = adc_bat->pdata;
 	struct power_supply_info *bat_info;

 	bat_info = &pdata->battery_info;
 	if (adc_bat->level == bat_info->charge_full_design)
 		return POWER_SUPPLY_STATUS_FULL;
 	return adc_bat->status;
 }

 static enum gab_chan_type gab_prop_to_chan(enum power_supply_property psp)
 {
 	switch (psp) {
 	case POWER_SUPPLY_PROP_POWER_NOW:
 		return GAB_POWER;
 	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 		return GAB_VOLTAGE;
 	case POWER_SUPPLY_PROP_CURRENT_NOW:
 		return GAB_CURRENT;
 	default:
 		WARN_ON(1);
 		break;
 	}
 	return GAB_POWER;
 }

 static int read_channel(struct gab *adc_bat, enum power_supply_property psp,
 		int *result)
 {
 	int ret;
 	int chan_index;

 	chan_index = gab_prop_to_chan(psp);
 	ret = iio_read_channel_processed(adc_bat->channel[chan_index],
 			result);
 	if (ret < 0)
 		pr_err("read channel error\n");
 	return ret;
 }

 static int gab_get_property(struct power_supply *psy,
 		enum power_supply_property psp, union power_supply_propval *val)
 {
 	struct gab *adc_bat;
 	struct gab_platform_data *pdata;
 	struct power_supply_info *bat_info;
 	int result = 0;
 	int ret = 0;

 	adc_bat = to_generic_bat(psy);
 	if (!adc_bat) {
 		dev_err(&psy->dev, "no battery infos ?!\n");
 		return -EINVAL;
 	}
 	pdata = adc_bat->pdata;
 	bat_info = &pdata->battery_info;

 	switch (psp) {
 	case POWER_SUPPLY_PROP_STATUS:
 		val->intval = gab_get_status(adc_bat);
 		break;
 	case POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN:
 		val->intval = 0;
 		break;
 	case POWER_SUPPLY_PROP_CHARGE_NOW:
 		val->intval = pdata->cal_charge(result);
 		break;
 	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 	case POWER_SUPPLY_PROP_CURRENT_NOW:
 	case POWER_SUPPLY_PROP_POWER_NOW:
 		ret = read_channel(adc_bat, psp, &result);
 		if (ret < 0)
 			goto err;
 		val->intval = result;
 		break;
 	case POWER_SUPPLY_PROP_TECHNOLOGY:
 		val->intval = bat_info->technology;
 		break;
 	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 		val->intval = bat_info->voltage_min_design;
 		break;
 	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
 		val->intval = bat_info->voltage_max_design;
 		break;
 	case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 		val->intval = bat_info->charge_full_design;
 		break;
 	case POWER_SUPPLY_PROP_MODEL_NAME:
 		val->strval = bat_info->name;
 		break;
 	default:
 		return -EINVAL;
 	}
 err:
 	return ret;
 }

 static void gab_work(struct work_struct *work)
 {
 	struct gab *adc_bat;
 	struct gab_platform_data *pdata;
 	struct delayed_work *delayed_work;
 	bool is_plugged;
 	int status;

 	delayed_work = to_delayed_work(work);
 	adc_bat = container_of(delayed_work, struct gab, bat_work);
 	pdata = adc_bat->pdata;
 	status = adc_bat->status;

 	is_plugged = power_supply_am_i_supplied(adc_bat->psy);
 	adc_bat->cable_plugged = is_plugged;

 	if (!is_plugged)
 		adc_bat->status =  POWER_SUPPLY_STATUS_DISCHARGING;
 	else if (gab_charge_finished(adc_bat))
 		adc_bat->status = POWER_SUPPLY_STATUS_NOT_CHARGING;
 	else
 		adc_bat->status = POWER_SUPPLY_STATUS_CHARGING;

 	if (status != adc_bat->status)
 		power_supply_changed(adc_bat->psy);
 }

 static irqreturn_t gab_charged(int irq, void *dev_id)
 {
 	struct gab *adc_bat = dev_id;
 	struct gab_platform_data *pdata = adc_bat->pdata;
 	int delay;

 	delay = pdata->jitter_delay ? pdata->jitter_delay : JITTER_DEFAULT;
 	schedule_delayed_work(&adc_bat->bat_work,
 			msecs_to_jiffies(delay));
 	return IRQ_HANDLED;
 }

 static int gab_probe(struct platform_device *pdev)
 {
 	struct gab *adc_bat;
 	struct power_supply_desc *psy_desc;
 	struct power_supply_config psy_cfg = {};
 	struct gab_platform_data *pdata = pdev->dev.platform_data;
 	int ret = 0;
 	int chan;
 	int index = ARRAY_SIZE(gab_props);
 	bool any = false;

 	adc_bat = devm_kzalloc(&pdev->dev, sizeof(*adc_bat), GFP_KERNEL);
 	if (!adc_bat) {
 		dev_err(&pdev->dev, "failed to allocate memory\n");
 		return -ENOMEM;
 	}

 	psy_cfg.drv_data = adc_bat;
 	psy_desc = &adc_bat->psy_desc;
 	psy_desc->name = pdata->battery_info.name;

 	/* bootup default values for the battery */
 	adc_bat->cable_plugged = false;
 	adc_bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
 	psy_desc->type = POWER_SUPPLY_TYPE_BATTERY;
 	psy_desc->get_property = gab_get_property;
 	psy_desc->external_power_changed = gab_ext_power_changed;
 	adc_bat->pdata = pdata;

 	/*
 	 * copying the static properties and allocating extra memory for holding
 	 * the extra configurable properties received from platform data.
 	 */
 	psy_desc->properties = kcalloc(ARRAY_SIZE(gab_props) +
 					ARRAY_SIZE(gab_chan_name),
 					sizeof(*psy_desc->properties),
 					GFP_KERNEL);
 	if (!psy_desc->properties) {
 		ret = -ENOMEM;
 		goto first_mem_fail;
 	}

 	memcpy(psy_desc->properties, gab_props, sizeof(gab_props));

 	/*
 	 * getting channel from iio and copying the battery properties
 	 * based on the channel supported by consumer device.
 	 */
 	for (chan = 0; chan < ARRAY_SIZE(gab_chan_name); chan++) {
 		adc_bat->channel[chan] = iio_channel_get(&pdev->dev,
 							 gab_chan_name[chan]);
 		if (IS_ERR(adc_bat->channel[chan])) {
 			ret = PTR_ERR(adc_bat->channel[chan]);
 			adc_bat->channel[chan] = NULL;
 		} else {
 			/* copying properties for supported channels only */
 			int index2;

 			for (index2 = 0; index2 < index; index2++) {
 				if (psy_desc->properties[index2] ==
 				    gab_dyn_props[chan])
 					break;	/* already known */
 			}
 			if (index2 == index)	/* really new */
 				psy_desc->properties[index++] =
 					gab_dyn_props[chan];
 			any = true;
 		}
 	}

 	/* none of the channels are supported so let's bail out */
 	if (!any) {
 		ret = -ENODEV;
 		goto second_mem_fail;
 	}

 	/*
 	 * Total number of properties is equal to static properties
 	 * plus the dynamic properties.Some properties may not be set
 	 * as come channels may be not be supported by the device.So
 	 * we need to take care of that.
 	 */
 	psy_desc->num_properties = index;

 	adc_bat->psy = power_supply_register(&pdev->dev, psy_desc, &psy_cfg);
 	if (IS_ERR(adc_bat->psy)) {
 		ret = PTR_ERR(adc_bat->psy);
 		goto err_reg_fail;
 	}

 	INIT_DELAYED_WORK(&adc_bat->bat_work, gab_work);

 	if (gpio_is_valid(pdata->gpio_charge_finished)) {
 		int irq;
 		ret = gpio_request(pdata->gpio_charge_finished, "charged");
 		if (ret)
 			goto gpio_req_fail;

 		irq = gpio_to_irq(pdata->gpio_charge_finished);
 		ret = request_any_context_irq(irq, gab_charged,
 				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
 				"battery charged", adc_bat);
 		if (ret < 0)
 			goto err_gpio;
 	}

 	platform_set_drvdata(pdev, adc_bat);

 	/* Schedule timer to check current status */
 	schedule_delayed_work(&adc_bat->bat_work,
 			msecs_to_jiffies(0));
 	return 0;

 err_gpio:
 	gpio_free(pdata->gpio_charge_finished);
 gpio_req_fail:
 	power_supply_unregister(adc_bat->psy);
 err_reg_fail:
 	for (chan = 0; chan < ARRAY_SIZE(gab_chan_name); chan++) {
 		if (adc_bat->channel[chan])
 			iio_channel_release(adc_bat->channel[chan]);
 	}
 second_mem_fail:
 	kfree(psy_desc->properties);
 first_mem_fail:
 	return ret;
 }

 static int gab_remove(struct platform_device *pdev)
 {
 	int chan;
 	struct gab *adc_bat = platform_get_drvdata(pdev);
 	struct gab_platform_data *pdata = adc_bat->pdata;

 	power_supply_unregister(adc_bat->psy);

 	if (gpio_is_valid(pdata->gpio_charge_finished)) {
 		free_irq(gpio_to_irq(pdata->gpio_charge_finished), adc_bat);
 		gpio_free(pdata->gpio_charge_finished);
 	}

 	for (chan = 0; chan < ARRAY_SIZE(gab_chan_name); chan++) {
 		if (adc_bat->channel[chan])
 			iio_channel_release(adc_bat->channel[chan]);
 	}

 	kfree(adc_bat->psy_desc.properties);
 	cancel_delayed_work(&adc_bat->bat_work);
 	return 0;
 }

 static int __maybe_unused gab_suspend(struct device *dev)
 {
 	struct gab *adc_bat = dev_get_drvdata(dev);

 	cancel_delayed_work_sync(&adc_bat->bat_work);
 	adc_bat->status = POWER_SUPPLY_STATUS_UNKNOWN;
 	return 0;
 }

 static int __maybe_unused gab_resume(struct device *dev)
 {
 	struct gab *adc_bat = dev_get_drvdata(dev);
 	struct gab_platform_data *pdata = adc_bat->pdata;
 	int delay;

 	delay = pdata->jitter_delay ? pdata->jitter_delay : JITTER_DEFAULT;

 	/* Schedule timer to check current status */
 	schedule_delayed_work(&adc_bat->bat_work,
 			msecs_to_jiffies(delay));
 	return 0;
 }

 static SIMPLE_DEV_PM_OPS(gab_pm_ops, gab_suspend, gab_resume);

 static struct platform_driver gab_driver = {
 	.driver		= {
 		.name	= "generic-adc-battery",
 		.pm	= &gab_pm_ops,
 	},
 	.probe		= gab_probe,
 	.remove		= gab_remove,
 };
 module_platform_driver(gab_driver);

 MODULE_AUTHOR("anish kumar <anish198519851985@gmail.com>");
 MODULE_DESCRIPTION("generic battery driver using IIO");
 MODULE_LICENSE("GPL");
	/*
	* Generic battery driver code using IIO
	* Copyright (C) 2012, Anish Kumar <anish198519851985@gmail.com>
	* based on jz4740-battery.c
	* based on s3c_adc_battery.c
	*
	* This file is subject to the terms and conditions of the GNU General Public
	* License. See the file COPYING in the main directory of this archive for
	* more details.
	*
	*/
	#include <linux/interrupt.h>
	#include <linux/platform_device.h>
	#include <linux/power_supply.h>
	#include <linux/gpio.h>
	#include <linux/err.h>
	#include <linux/timer.h>
	#include <linux/jiffies.h>
	#include <linux/errno.h>
	#include <linux/init.h>
	#include <linux/module.h>
	#include <linux/slab.h>
	#include <linux/iio/consumer.h>
	#include <linux/iio/types.h>
	#include <linux/power/generic-adc-battery.h>

	#define JITTER_DEFAULT 10 /* hope 10ms is enough */

	enum gab_chan_type {
	GAB_VOLTAGE = 0,
	GAB_CURRENT,
	GAB_POWER,
	GAB_MAX_CHAN_TYPE
	};

	/*
	* gab_chan_name suggests the standard channel names for commonly used
	* channel types.
	*/
	static const char *const gab_chan_name[] = {
	[GAB_VOLTAGE] = "voltage",
	[GAB_CURRENT] = "current",
	[GAB_POWER] = "power",
	};

	struct gab {
	struct power_supply *psy;
	struct power_supply_desc psy_desc;
	struct iio_channel *channel[GAB_MAX_CHAN_TYPE];
	struct gab_platform_data *pdata;
	struct delayed_work bat_work;
	int level;
	int status;
	bool cable_plugged;
	};

	static struct gab to_generic_bat(struct power_supply psy)
	{
	return power_supply_get_drvdata(psy);
	}

	static void gab_ext_power_changed(struct power_supply *psy)
	{
	struct gab *adc_bat = to_generic_bat(psy);

	schedule_delayed_work(&adc_bat->bat_work, msecs_to_jiffies(0));
	}

	static const enum power_supply_property gab_props[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
	POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN,
	POWER_SUPPLY_PROP_CHARGE_NOW,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_CURRENT_NOW,
	POWER_SUPPLY_PROP_TECHNOLOGY,
	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
	POWER_SUPPLY_PROP_MODEL_NAME,
	};

	/*
	* This properties are set based on the received platform data and this
	* should correspond one-to-one with enum chan_type.
	*/
	static const enum power_supply_property gab_dyn_props[] = {
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_CURRENT_NOW,
	POWER_SUPPLY_PROP_POWER_NOW,
	};

	static bool gab_charge_finished(struct gab *adc_bat)
	{
	struct gab_platform_data *pdata = adc_bat->pdata;
	bool ret = gpio_get_value(pdata->gpio_charge_finished);
	bool inv = pdata->gpio_inverted;

	if (!gpio_is_valid(pdata->gpio_charge_finished))
	return false;
	return ret ^ inv;
	}

	static int gab_get_status(struct gab *adc_bat)
	{
	struct gab_platform_data *pdata = adc_bat->pdata;
	struct power_supply_info *bat_info;

	bat_info = &pdata->battery_info;
	if (adc_bat->level == bat_info->charge_full_design)
	return POWER_SUPPLY_STATUS_FULL;
	return adc_bat->status;
	}

	static enum gab_chan_type gab_prop_to_chan(enum power_supply_property psp)
	{
	switch (psp) {
	case POWER_SUPPLY_PROP_POWER_NOW:
	return GAB_POWER;
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
	return GAB_VOLTAGE;
	case POWER_SUPPLY_PROP_CURRENT_NOW:
	return GAB_CURRENT;
	default:
	WARN_ON(1);
	break;
	}
	return GAB_POWER;
	}

	static int read_channel(struct gab *adc_bat, enum power_supply_property psp,
	int *result)
	{
	int ret;
	int chan_index;

	chan_index = gab_prop_to_chan(psp);
	ret = iio_read_channel_processed(adc_bat->channel[chan_index],
	result);
	if (ret < 0)
	pr_err("read channel error\n");
	return ret;
	}

	static int gab_get_property(struct power_supply *psy,
	enum power_supply_property psp, union power_supply_propval *val)
	{
	struct gab *adc_bat;
	struct gab_platform_data *pdata;
	struct power_supply_info *bat_info;
	int result = 0;
	int ret = 0;

	adc_bat = to_generic_bat(psy);
	if (!adc_bat) {
	dev_err(&psy->dev, "no battery infos ?!\n");
	return -EINVAL;
	}
	pdata = adc_bat->pdata;
	bat_info = &pdata->battery_info;

	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
	val->intval = gab_get_status(adc_bat);
	break;
	case POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN:
	val->intval = 0;
	break;
	case POWER_SUPPLY_PROP_CHARGE_NOW:
	val->intval = pdata->cal_charge(result);
	break;
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
	case POWER_SUPPLY_PROP_CURRENT_NOW:
	case POWER_SUPPLY_PROP_POWER_NOW:
	ret = read_channel(adc_bat, psp, &result);
	if (ret < 0)
	goto err;
	val->intval = result;
	break;
	case POWER_SUPPLY_PROP_TECHNOLOGY:
	val->intval = bat_info->technology;
	break;
	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
	val->intval = bat_info->voltage_min_design;
	break;
	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
	val->intval = bat_info->voltage_max_design;
	break;
	case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
	val->intval = bat_info->charge_full_design;
	break;
	case POWER_SUPPLY_PROP_MODEL_NAME:
	val->strval = bat_info->name;
	break;
	default:
	return -EINVAL;
	}
	err:
	return ret;
	}

	static void gab_work(struct work_struct *work)
	{
	struct gab *adc_bat;
	struct gab_platform_data *pdata;
	struct delayed_work *delayed_work;
	bool is_plugged;
	int status;

	delayed_work = to_delayed_work(work);
	adc_bat = container_of(delayed_work, struct gab, bat_work);
	pdata = adc_bat->pdata;
	status = adc_bat->status;

	is_plugged = power_supply_am_i_supplied(adc_bat->psy);
	adc_bat->cable_plugged = is_plugged;

	if (!is_plugged)
	adc_bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
	else if (gab_charge_finished(adc_bat))
	adc_bat->status = POWER_SUPPLY_STATUS_NOT_CHARGING;
	else
	adc_bat->status = POWER_SUPPLY_STATUS_CHARGING;

	if (status != adc_bat->status)
	power_supply_changed(adc_bat->psy);
	}

	static irqreturn_t gab_charged(int irq, void *dev_id)
	{
	struct gab *adc_bat = dev_id;
	struct gab_platform_data *pdata = adc_bat->pdata;
	int delay;

	delay = pdata->jitter_delay ? pdata->jitter_delay : JITTER_DEFAULT;
	schedule_delayed_work(&adc_bat->bat_work,
	msecs_to_jiffies(delay));
	return IRQ_HANDLED;
	}

	static int gab_probe(struct platform_device *pdev)
	{
	struct gab *adc_bat;
	struct power_supply_desc *psy_desc;
	struct power_supply_config psy_cfg = {};
	struct gab_platform_data *pdata = pdev->dev.platform_data;
	int ret = 0;
	int chan;
	int index = ARRAY_SIZE(gab_props);
	bool any = false;

	adc_bat = devm_kzalloc(&pdev->dev, sizeof(*adc_bat), GFP_KERNEL);
	if (!adc_bat) {
	dev_err(&pdev->dev, "failed to allocate memory\n");
	return -ENOMEM;
	}

	psy_cfg.drv_data = adc_bat;
	psy_desc = &adc_bat->psy_desc;
	psy_desc->name = pdata->battery_info.name;

	/* bootup default values for the battery */
	adc_bat->cable_plugged = false;
	adc_bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
	psy_desc->type = POWER_SUPPLY_TYPE_BATTERY;
	psy_desc->get_property = gab_get_property;
	psy_desc->external_power_changed = gab_ext_power_changed;
	adc_bat->pdata = pdata;

	/*
	* copying the static properties and allocating extra memory for holding
	* the extra configurable properties received from platform data.
	*/
	psy_desc->properties = kcalloc(ARRAY_SIZE(gab_props) +
	ARRAY_SIZE(gab_chan_name),
	sizeof(*psy_desc->properties),
	GFP_KERNEL);
	if (!psy_desc->properties) {
	ret = -ENOMEM;
	goto first_mem_fail;
	}

	memcpy(psy_desc->properties, gab_props, sizeof(gab_props));

	/*
	* getting channel from iio and copying the battery properties
	* based on the channel supported by consumer device.
	*/
	for (chan = 0; chan < ARRAY_SIZE(gab_chan_name); chan++) {
	adc_bat->channel[chan] = iio_channel_get(&pdev->dev,
	gab_chan_name[chan]);
	if (IS_ERR(adc_bat->channel[chan])) {
	ret = PTR_ERR(adc_bat->channel[chan]);
	adc_bat->channel[chan] = NULL;
	} else {
	/* copying properties for supported channels only */
	int index2;

	for (index2 = 0; index2 < index; index2++) {
	if (psy_desc->properties[index2] ==
	gab_dyn_props[chan])
	break; /* already known */
	}
	if (index2 == index) /* really new */
	psy_desc->properties[index++] =
	gab_dyn_props[chan];
	any = true;
	}
	}

	/* none of the channels are supported so let's bail out */
	if (!any) {
	ret = -ENODEV;
	goto second_mem_fail;
	}

	/*
	* Total number of properties is equal to static properties
	* plus the dynamic properties.Some properties may not be set
	* as come channels may be not be supported by the device.So
	* we need to take care of that.
	*/
	psy_desc->num_properties = index;

	adc_bat->psy = power_supply_register(&pdev->dev, psy_desc, &psy_cfg);
	if (IS_ERR(adc_bat->psy)) {
	ret = PTR_ERR(adc_bat->psy);
	goto err_reg_fail;
	}

	INIT_DELAYED_WORK(&adc_bat->bat_work, gab_work);

	if (gpio_is_valid(pdata->gpio_charge_finished)) {
	int irq;
	ret = gpio_request(pdata->gpio_charge_finished, "charged");
	if (ret)
	goto gpio_req_fail;

	irq = gpio_to_irq(pdata->gpio_charge_finished);
	ret = request_any_context_irq(irq, gab_charged,
	IRQF_TRIGGER_RISING \| IRQF_TRIGGER_FALLING,
	"battery charged", adc_bat);
	if (ret < 0)
	goto err_gpio;
	}

	platform_set_drvdata(pdev, adc_bat);

	/* Schedule timer to check current status */
	schedule_delayed_work(&adc_bat->bat_work,
	msecs_to_jiffies(0));
	return 0;

	err_gpio:
	gpio_free(pdata->gpio_charge_finished);
	gpio_req_fail:
	power_supply_unregister(adc_bat->psy);
	err_reg_fail:
	for (chan = 0; chan < ARRAY_SIZE(gab_chan_name); chan++) {
	if (adc_bat->channel[chan])
	iio_channel_release(adc_bat->channel[chan]);
	}
	second_mem_fail:
	kfree(psy_desc->properties);
	first_mem_fail:
	return ret;
	}

	static int gab_remove(struct platform_device *pdev)
	{
	int chan;
	struct gab *adc_bat = platform_get_drvdata(pdev);
	struct gab_platform_data *pdata = adc_bat->pdata;

	power_supply_unregister(adc_bat->psy);

	if (gpio_is_valid(pdata->gpio_charge_finished)) {
	free_irq(gpio_to_irq(pdata->gpio_charge_finished), adc_bat);
	gpio_free(pdata->gpio_charge_finished);
	}

	for (chan = 0; chan < ARRAY_SIZE(gab_chan_name); chan++) {
	if (adc_bat->channel[chan])
	iio_channel_release(adc_bat->channel[chan]);
	}

	kfree(adc_bat->psy_desc.properties);
	cancel_delayed_work(&adc_bat->bat_work);
	return 0;
	}

	static int __maybe_unused gab_suspend(struct device *dev)
	{
	struct gab *adc_bat = dev_get_drvdata(dev);

	cancel_delayed_work_sync(&adc_bat->bat_work);
	adc_bat->status = POWER_SUPPLY_STATUS_UNKNOWN;
	return 0;
	}

	static int __maybe_unused gab_resume(struct device *dev)
	{
	struct gab *adc_bat = dev_get_drvdata(dev);
	struct gab_platform_data *pdata = adc_bat->pdata;
	int delay;

	delay = pdata->jitter_delay ? pdata->jitter_delay : JITTER_DEFAULT;

	/* Schedule timer to check current status */
	schedule_delayed_work(&adc_bat->bat_work,
	msecs_to_jiffies(delay));
	return 0;
	}

	static SIMPLE_DEV_PM_OPS(gab_pm_ops, gab_suspend, gab_resume);

	static struct platform_driver gab_driver = {
	.driver = {
	.name = "generic-adc-battery",
	.pm = &gab_pm_ops,
	},
	.probe = gab_probe,
	.remove = gab_remove,
	};
	module_platform_driver(gab_driver);

	MODULE_AUTHOR("anish kumar <anish198519851985@gmail.com>");
	MODULE_DESCRIPTION("generic battery driver using IIO");
	MODULE_LICENSE("GPL");