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Message-ID: <CAH9JG2V7-c_r1aASoxv6ZHKvifW0y3axmo1yJAjLN_SavPO7yQ@mail.gmail.com>
Date:	Sat, 22 Sep 2012 14:23:46 +0900
From:	Kyungmin Park <kyungmin.park@...sung.com>
To:	Anton Vorontsov <anton.vorontsov@...aro.org>
Cc:	Chanwoo Choi <cw00.choi@...sung.com>, jenny.tc@...el.com,
	ramakrishna.pallala@...el.com, myungjoo.ham@...sung.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] charger-manager: Add support sysfs entry for charger

On 9/22/12, Anton Vorontsov <anton.vorontsov@...aro.org> wrote:
> On Fri, Sep 21, 2012 at 06:49:37PM +0900, Chanwoo Choi wrote:
>> This patch add support sysfs entry for each charger(regulator).
>> Charger-manager use one or more chargers for charging battery but
>> some charger isn't necessary on specific scenario. So, if some charger
>> isn't needed, can disable specific charger through 'externally_control'
>> entry while system is on state and confirm the information(name, state)
>> of charger.
> [...]
>> the list of added sysfs entry
>> - /sys/class/power_supply/battery/chargers/charger.[index]/name
>> : show name of charger(regulator)
>> - /sys/class/power_supply/battery/chargers/charger.[index]/state
>> : show either enabled or disabled state of charger
>> -
>> /sys/class/power_supply/battery/chargers/charger.[index]/externally_control
>>
>> If 'externally_control' of specific charger is 1, Charger-manager cannot
>> enable
>> regulator for charging when charger cable is attached and charger must be
>> maintained with disabled state. If 'externally_control' is zero,
>> Charger-manager
>> usually can control to enable/disable regulator.
>>
>> Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
>> Signed-off-by: Myungjoo Ham <myungjoo.ham@...sung.com>
>> Signed-off-by: Kyungmin Park <kyungmin.park@...sung.com>
>> ---
>
> Thanks for your work, folks!
>
> There are some serious issues wrt. the coding standards, though.
>
> (I must confess that because of the issues I didn't look much into the
> logic itself, I hope it works.)
>
>>  drivers/power/charger-manager.c       |  174
>> ++++++++++++++++++++++++++++++++-
>>  include/linux/power/charger-manager.h |   19 ++++
>>  2 files changed, 192 insertions(+), 1 deletions(-)
>>
>> diff --git a/drivers/power/charger-manager.c
>> b/drivers/power/charger-manager.c
>> index e92ec55..a1ab825 100644
>> --- a/drivers/power/charger-manager.c
>> +++ b/drivers/power/charger-manager.c
>> @@ -22,6 +22,7 @@
>>  #include <linux/platform_device.h>
>>  #include <linux/power/charger-manager.h>
>>  #include <linux/regulator/consumer.h>
>> +#include <linux/sysfs.h>
>>
>>  static const char * const default_event_names[] = {
>>  	[CM_EVENT_UNKNOWN] = "Unknown",
>> @@ -332,6 +333,9 @@ static int try_charger_enable(struct charger_manager
>> *cm, bool enable)
>>  		cm->charging_end_time = 0;
>>
>>  		for (i = 0 ; i < desc->num_charger_regulators ; i++) {
>> +			if (desc->charger_regulators[i].externally_control)
>> +				continue;
>> +
>>  			err = regulator_enable(desc->charger_regulators[i].consumer);
>>  			if (err < 0) {
>>  				dev_warn(cm->dev,
>> @@ -348,6 +352,9 @@ static int try_charger_enable(struct charger_manager
>> *cm, bool enable)
>>  		cm->charging_end_time = ktime_to_ms(ktime_get());
>>
>>  		for (i = 0 ; i < desc->num_charger_regulators ; i++) {
>> +			if (desc->charger_regulators[i].externally_control)
>> +				continue;
>> +
>>  			err = regulator_disable(desc->charger_regulators[i].consumer);
>>  			if (err < 0) {
>>  				dev_warn(cm->dev,
>> @@ -1217,12 +1224,101 @@ static int charger_extcon_init(struct
>> charger_manager *cm,
>>  	return ret;
>>  }
>>
>> +/* help function of sysfs node to control charger(regulator) */
>> +static ssize_t charger_name_show(struct device *dev,
>> +				struct device_attribute *attr, char *buf)
>> +{
>> +	struct charger_regulator *charger
>> +		= container_of(attr, struct charger_regulator, attr_name);
>
> Here must be an empty line.
>
>> +	return sprintf(buf, "%s\n", charger->regulator_name);
>> +}
>> +
>> +static ssize_t charger_state_show(struct device *dev,
>> +				struct device_attribute *attr, char *buf)
>> +{
>> +	struct charger_regulator *charger
>> +		= container_of(attr, struct charger_regulator, attr_state);
>> +	int state = 1;
>
> = 1 is not needed. Instead, you could rewrite it as
>
> int state = 0;
>
> if (!charger->externally_control)
> 	state = regulator_is_enabled(charger->consumer);
>
>> +	if (charger->externally_control)
>> +		state = 0;
>> +	else
>> +		state = regulator_is_enabled(charger->consumer);
>> +
>> +	return sprintf(buf, "%s\n", state ? "enabled" : "disabled");
>> +}
>> +
>> +static ssize_t charger_externally_control_show(struct device *dev,
>> +				struct device_attribute *attr, char *buf)
>> +{
>> +	struct charger_regulator *charger = container_of(attr,
>> +			struct charger_regulator, attr_externally_control);
>
> Empty line is required.
>
>> +	return sprintf(buf, "%d\n", charger->externally_control);
>> +}
>> +
>> +static ssize_t charger_externally_control_store(struct device *dev,
>> +				struct device_attribute *attr, const char *buf,
>> +				size_t count)
>> +{
>> +	struct charger_regulator *charger
>> +		= container_of(attr, struct charger_regulator,
>> +					attr_externally_control);
>> +	struct charger_manager *cm = charger->cm;
>> +	struct charger_desc *desc = cm->desc;
>> +	int i, ret;
>
> One variable declaration per line.
>
>> +	int externally_control;
>> +
>> +	ret = sscanf(buf, "%d", &externally_control);
>> +	if (ret == 0) {
>> +		ret = -EINVAL;
>> +		return ret;
>> +	}
>> +
>> +	if (externally_control) {
>
> By writing
>
> if (!externally_control) {
> 	charger->externally_control = externally_control;
> 	return count;
> }
>
> You could greatly reduce indentation level (and readability).
>
>> +		int chargers_externally_control = 1;
>> +
>> +		for (i = 0 ; i < desc->num_charger_regulators ; i++) {
>> +			if ((&desc->charger_regulators[i] != charger)
>
> Parethesis are not needed for the != condition.
>
>> +			&& !desc->charger_regulators[i].externally_control) {
>
> Wrong indentation for 'if' continuation line, and && should have
> been on the previous line.
>
>> +				/*
>> +				 * At least, one charger is controlled by
>> +				 * charger-manager
>> +				 */
>> +				chargers_externally_control = 0;
>> +				break;
>> +			}
>> +		}
>> +
>> +		if (!chargers_externally_control) {
>> +			if (cm->charger_enabled) {
>> +				try_charger_enable(charger->cm, false);
>> +				charger->externally_control
>> +					= externally_control;
>> +				try_charger_enable(charger->cm, true);
>> +			} else
>> +				charger->externally_control
>> +					= externally_control;
>
> Since you use multiline 'if', else must have opening braced as
> well, i.e.
>
> } else {
> 	....
> }
>
>> +
>> +		} else {
>> +			dev_warn(cm->dev,
>> +				"\'%s\' regulator should be controlled "
>
> \ is not needed.
>
>> +				"in charger-manager because charger-manager "
>> +				"must need at least one charger for charging\n",
>> +				charger->regulator_name);
>> +		}
>> +	} else
>> +		charger->externally_control = externally_control;
>> +
>> +	return count;
>> +}
>> +
>>  static int charger_manager_probe(struct platform_device *pdev)
>>  {
>>  	struct charger_desc *desc = dev_get_platdata(&pdev->dev);
>>  	struct charger_manager *cm;
>>  	int ret = 0, i = 0;
>>  	int j = 0;
>> +	int chargers_externally_control = 1;
>>  	union power_supply_propval val;
>>
>>  	if (g_desc && !rtc_dev && g_desc->rtc_name) {
>> @@ -1412,6 +1508,8 @@ static int charger_manager_probe(struct
>> platform_device *pdev)
>>  	for (i = 0 ; i < desc->num_charger_regulators ; i++) {
>>  		struct charger_regulator *charger
>>  					= &desc->charger_regulators[i];
>> +		char buf[11];
>> +		char *str;
>>
>>  		charger->consumer = regulator_get(&pdev->dev,
>>  					charger->regulator_name);
>> @@ -1421,8 +1519,9 @@ static int charger_manager_probe(struct
>> platform_device *pdev)
>>  			ret = -EINVAL;
>>  			goto err_chg_get;
>>  		}
>> +		charger->cm = cm;
>>
>> -		for (j = 0 ; j < charger->num_cables ; j++) {
>> +		for (j = 0; j < charger->num_cables; j++) {
>
> While this exact change is technically correct, it does not belong
> to this patch.
>
>>  			struct charger_cable *cable = &charger->cables[j];
>>
>>  			ret = charger_extcon_init(cm, cable);
>> @@ -1434,6 +1533,71 @@ static int charger_manager_probe(struct
>> platform_device *pdev)
>>  			cable->charger = charger;
>>  			cable->cm = cm;
>>  		}
>> +
>> +		/* Create sysfs entry to control charger(regulator) */
>> +		snprintf(buf, 10, "charger.%d", i);
>> +		str = kzalloc(sizeof(char) * (strlen(buf) + 1), GFP_KERNEL);
>> +		if (!str) {
>> +			for (i--; i >= 0; i--) {
>> +				charger = &desc->charger_regulators[i];
>> +				kfree(charger->attr_g.name);
>> +			}
>> +			ret = -ENOMEM;
>> +
>> +			goto err_extcon;
>> +		}
>> +		strcpy(str, buf);
>> +
>> +		charger->attrs[0] = &charger->attr_name.attr;
>> +		charger->attrs[1] = &charger->attr_state.attr;
>> +		charger->attrs[2] = &charger->attr_externally_control.attr;
>> +		charger->attrs[3] = NULL;
>> +		charger->attr_g.name = str;
>> +		charger->attr_g.attrs = charger->attrs;
>> +
>> +		sysfs_attr_init(&charger->attr_name.attr);
>> +		charger->attr_name.attr.name = "name";
>> +		charger->attr_name.attr.mode = 0444;
>> +		charger->attr_name.show = charger_name_show;
>> +
>> +		sysfs_attr_init(&charger->attr_state.attr);
>> +		charger->attr_state.attr.name = "state";
>> +		charger->attr_state.attr.mode = 0444;
>> +		charger->attr_state.show = charger_state_show;
>> +
>> +		sysfs_attr_init(&charger->attr_externally_control.attr);
>> +		charger->attr_externally_control.attr.name
>> +				= "externally_control";
>> +		charger->attr_externally_control.attr.mode = 0644;
>> +		charger->attr_externally_control.show
>> +				= charger_externally_control_show;
>> +		charger->attr_externally_control.store
>> +				= charger_externally_control_store;
>> +
>> +		if (!desc->charger_regulators[i].externally_control
>> +				|| !chargers_externally_control) {
>
> wrong || placement (should be on the previous line)
>
>> +			chargers_externally_control = 0;
>> +		}
>> +		dev_info(&pdev->dev, "\'%s\' regulator's externally_control"
>
> \ is not needed.
>
>> +				"is %d\n", charger->regulator_name,
>> +				charger->externally_control);
>> +
>> +		ret = sysfs_create_group(&cm->charger_psy.dev->kobj,
>> +				&charger->attr_g);
>> +		if (ret < 0) {
>> +			dev_info(&pdev->dev, "Cannot create sysfs entry"
>> +					"of %s regulator\n",
>> +					charger->regulator_name);
>> +		}
>> +	}
>> +
>> +	if (chargers_externally_control) {
>> +		dev_err(&pdev->dev, "Cannot register regulator because "
>> +				"charger-manager must need at least "
>> +				"one charger for charging battery\n");
>> +
>> +		ret = -EINVAL;
>> +		goto err_chg_enable;
>>  	}
>>
>>  	ret = try_charger_enable(cm, true);
>> @@ -1459,6 +1623,14 @@ static int charger_manager_probe(struct
>> platform_device *pdev)
>>  	return 0;
>>
>>  err_chg_enable:
>> +	for (i = 0 ; i < desc->num_charger_regulators ; i++) {
>
> No spaces before ";".
>
>> +		struct charger_regulator *charger
>> +					= &desc->charger_regulators[i];
>
> Empty line here.
>
>> +		struct charger_regulator *charger
>> +					= &desc->charger_regulators[i];
>> +		charger = &desc->charger_regulators[i];
>
> One of the assignments is not needed.
>
> So pretty much every line of this patch breaks coding style rules. I fixed
> it all myself and applied the patch (since it's pretty late, and I don't
> want you to miss the merge window. But double check the final result, it
> is inlined down below)
>
> Also, please carefully (re)read Documentation/CodingStyle, and fully
> adhere to these standards for any further patch submissions.
>
> Thanks,
> Anton.
>
>
> - - - -
> From: Chanwoo Choi <cw00.choi@...sung.com>
> Subject: charger-manager: Add support sysfs entry for charger
>
> This patch add support sysfs entry for each charger(regulator).
> Charger-manager use one or more chargers for charging battery but some
> charger isn't necessary on specific scenario. So, if some charger isn't
> needed, can disable specific charger through 'externally_control' entry
> while system is on state and confirm the information(name, state) of
> charger.
>
> The list of added sysfs entry
> - /sys/class/power_supply/battery/chargers/charger.[index]/name
>   show name of charger(regulator)
> - /sys/class/power_supply/battery/chargers/charger.[index]/state
>   show either enabled or disabled state of charger
> -
> /sys/class/power_supply/battery/chargers/charger.[index]/externally_control
>
> If 'externally_control' of specific charger is 1, Charger-manager cannot
> enable regulator for charging when charger cable is attached and charger
> must be maintained with disabled state. If 'externally_control' is zero,
> Charger-manager usually can control to enable/disable regulator.
>
> Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
> Signed-off-by: Myungjoo Ham <myungjoo.ham@...sung.com>
> Signed-off-by: Kyungmin Park <kyungmin.park@...sung.com>
> Signed-off-by: Anton Vorontsov <anton.vorontsov@...aro.org>
Thanks Antron.
> ---
>  drivers/power/charger-manager.c       | 172
> ++++++++++++++++++++++++++++++++++
>  include/linux/power/charger-manager.h |  19 ++++
>  2 files changed, 191 insertions(+)
>
> diff --git a/drivers/power/charger-manager.c
> b/drivers/power/charger-manager.c
> index e92ec55..92dfa5c 100644
> --- a/drivers/power/charger-manager.c
> +++ b/drivers/power/charger-manager.c
> @@ -22,6 +22,7 @@
>  #include <linux/platform_device.h>
>  #include <linux/power/charger-manager.h>
>  #include <linux/regulator/consumer.h>
> +#include <linux/sysfs.h>
>
>  static const char * const default_event_names[] = {
>  	[CM_EVENT_UNKNOWN] = "Unknown",
> @@ -332,6 +333,9 @@ static int try_charger_enable(struct charger_manager
> *cm, bool enable)
>  		cm->charging_end_time = 0;
>
>  		for (i = 0 ; i < desc->num_charger_regulators ; i++) {
> +			if (desc->charger_regulators[i].externally_control)
> +				continue;
> +
>  			err = regulator_enable(desc->charger_regulators[i].consumer);
>  			if (err < 0) {
>  				dev_warn(cm->dev,
> @@ -348,6 +352,9 @@ static int try_charger_enable(struct charger_manager
> *cm, bool enable)
>  		cm->charging_end_time = ktime_to_ms(ktime_get());
>
>  		for (i = 0 ; i < desc->num_charger_regulators ; i++) {
> +			if (desc->charger_regulators[i].externally_control)
> +				continue;
> +
>  			err = regulator_disable(desc->charger_regulators[i].consumer);
>  			if (err < 0) {
>  				dev_warn(cm->dev,
> @@ -1217,12 +1224,101 @@ static int charger_extcon_init(struct
> charger_manager *cm,
>  	return ret;
>  }
>
> +/* help function of sysfs node to control charger(regulator) */
> +static ssize_t charger_name_show(struct device *dev,
> +				struct device_attribute *attr, char *buf)
> +{
> +	struct charger_regulator *charger
> +		= container_of(attr, struct charger_regulator, attr_name);
> +
> +	return sprintf(buf, "%s\n", charger->regulator_name);
> +}
> +
> +static ssize_t charger_state_show(struct device *dev,
> +				struct device_attribute *attr, char *buf)
> +{
> +	struct charger_regulator *charger
> +		= container_of(attr, struct charger_regulator, attr_state);
> +	int state = 0;
> +
> +	if (!charger->externally_control)
> +		state = regulator_is_enabled(charger->consumer);
> +
> +	return sprintf(buf, "%s\n", state ? "enabled" : "disabled");
> +}
> +
> +static ssize_t charger_externally_control_show(struct device *dev,
> +				struct device_attribute *attr, char *buf)
> +{
> +	struct charger_regulator *charger = container_of(attr,
> +			struct charger_regulator, attr_externally_control);
> +
> +	return sprintf(buf, "%d\n", charger->externally_control);
> +}
> +
> +static ssize_t charger_externally_control_store(struct device *dev,
> +				struct device_attribute *attr, const char *buf,
> +				size_t count)
> +{
> +	struct charger_regulator *charger
> +		= container_of(attr, struct charger_regulator,
> +					attr_externally_control);
> +	struct charger_manager *cm = charger->cm;
> +	struct charger_desc *desc = cm->desc;
> +	int i;
> +	int ret;
> +	int externally_control;
> +	int chargers_externally_control = 1;
> +
> +	ret = sscanf(buf, "%d", &externally_control);
> +	if (ret == 0) {
> +		ret = -EINVAL;
> +		return ret;
> +	}
> +
> +	if (!externally_control) {
> +		charger->externally_control = 0;
> +		return count;
> +	}
> +
> +	for (i = 0; i < desc->num_charger_regulators; i++) {
> +		if (&desc->charger_regulators[i] != charger &&
> +			      !desc->charger_regulators[i].externally_control) {
> +			/*
> +			 * At least, one charger is controlled by
> +			 * charger-manager
> +			 */
> +			chargers_externally_control = 0;
> +			break;
> +		}
> +	}
> +
> +	if (!chargers_externally_control) {
> +		if (cm->charger_enabled) {
> +			try_charger_enable(charger->cm, false);
> +			charger->externally_control = externally_control;
> +			try_charger_enable(charger->cm, true);
> +		} else {
> +			charger->externally_control = externally_control;
> +		}
> +	} else {
> +		dev_warn(cm->dev,
> +			"'%s' regulator should be controlled "
> +			"in charger-manager because charger-manager "
> +			"must need at least one charger for charging\n",
> +			charger->regulator_name);
> +	}
> +
> +	return count;
> +}
> +
>  static int charger_manager_probe(struct platform_device *pdev)
>  {
>  	struct charger_desc *desc = dev_get_platdata(&pdev->dev);
>  	struct charger_manager *cm;
>  	int ret = 0, i = 0;
>  	int j = 0;
> +	int chargers_externally_control = 1;
>  	union power_supply_propval val;
>
>  	if (g_desc && !rtc_dev && g_desc->rtc_name) {
> @@ -1412,6 +1508,8 @@ static int charger_manager_probe(struct
> platform_device *pdev)
>  	for (i = 0 ; i < desc->num_charger_regulators ; i++) {
>  		struct charger_regulator *charger
>  					= &desc->charger_regulators[i];
> +		char buf[11];
> +		char *str;
>
>  		charger->consumer = regulator_get(&pdev->dev,
>  					charger->regulator_name);
> @@ -1421,6 +1519,7 @@ static int charger_manager_probe(struct
> platform_device *pdev)
>  			ret = -EINVAL;
>  			goto err_chg_get;
>  		}
> +		charger->cm = cm;
>
>  		for (j = 0 ; j < charger->num_cables ; j++) {
>  			struct charger_cable *cable = &charger->cables[j];
> @@ -1434,6 +1533,71 @@ static int charger_manager_probe(struct
> platform_device *pdev)
>  			cable->charger = charger;
>  			cable->cm = cm;
>  		}
> +
> +		/* Create sysfs entry to control charger(regulator) */
> +		snprintf(buf, 10, "charger.%d", i);
> +		str = kzalloc(sizeof(char) * (strlen(buf) + 1), GFP_KERNEL);
> +		if (!str) {
> +			for (i--; i >= 0; i--) {
> +				charger = &desc->charger_regulators[i];
> +				kfree(charger->attr_g.name);
> +			}
> +			ret = -ENOMEM;
> +
> +			goto err_extcon;
> +		}
> +		strcpy(str, buf);
> +
> +		charger->attrs[0] = &charger->attr_name.attr;
> +		charger->attrs[1] = &charger->attr_state.attr;
> +		charger->attrs[2] = &charger->attr_externally_control.attr;
> +		charger->attrs[3] = NULL;
> +		charger->attr_g.name = str;
> +		charger->attr_g.attrs = charger->attrs;
> +
> +		sysfs_attr_init(&charger->attr_name.attr);
> +		charger->attr_name.attr.name = "name";
> +		charger->attr_name.attr.mode = 0444;
> +		charger->attr_name.show = charger_name_show;
> +
> +		sysfs_attr_init(&charger->attr_state.attr);
> +		charger->attr_state.attr.name = "state";
> +		charger->attr_state.attr.mode = 0444;
> +		charger->attr_state.show = charger_state_show;
> +
> +		sysfs_attr_init(&charger->attr_externally_control.attr);
> +		charger->attr_externally_control.attr.name
> +				= "externally_control";
> +		charger->attr_externally_control.attr.mode = 0644;
> +		charger->attr_externally_control.show
> +				= charger_externally_control_show;
> +		charger->attr_externally_control.store
> +				= charger_externally_control_store;
> +
> +		if (!desc->charger_regulators[i].externally_control ||
> +				!chargers_externally_control) {
> +			chargers_externally_control = 0;
> +		}
> +		dev_info(&pdev->dev, "'%s' regulator's externally_control"
> +				"is %d\n", charger->regulator_name,
> +				charger->externally_control);
> +
> +		ret = sysfs_create_group(&cm->charger_psy.dev->kobj,
> +				&charger->attr_g);
> +		if (ret < 0) {
> +			dev_info(&pdev->dev, "Cannot create sysfs entry"
> +					"of %s regulator\n",
> +					charger->regulator_name);
> +		}
> +	}
> +
> +	if (chargers_externally_control) {
> +		dev_err(&pdev->dev, "Cannot register regulator because "
> +				"charger-manager must need at least "
> +				"one charger for charging battery\n");
> +
> +		ret = -EINVAL;
> +		goto err_chg_enable;
>  	}
>
>  	ret = try_charger_enable(cm, true);
> @@ -1459,6 +1623,14 @@ static int charger_manager_probe(struct
> platform_device *pdev)
>  	return 0;
>
>  err_chg_enable:
> +	for (i = 0; i < desc->num_charger_regulators; i++) {
> +		struct charger_regulator *charger;
> +
> +		charger = &desc->charger_regulators[i];
> +		sysfs_remove_group(&cm->charger_psy.dev->kobj,
> +				&charger->attr_g);
> +		kfree(charger->attr_g.name);
> +	}
>  err_extcon:
>  	for (i = 0 ; i < desc->num_charger_regulators ; i++) {
>  		struct charger_regulator *charger
> diff --git a/include/linux/power/charger-manager.h
> b/include/linux/power/charger-manager.h
> index a7b388e..0e86840 100644
> --- a/include/linux/power/charger-manager.h
> +++ b/include/linux/power/charger-manager.h
> @@ -109,24 +109,43 @@ struct charger_cable {
>   * struct charger_regulator
>   * @regulator_name: the name of regulator for using charger.
>   * @consumer: the regulator consumer for the charger.
> + * @externally_control:
> + *	Set if the charger-manager cannot control charger,
> + *	the charger will be maintained with disabled state.
>   * @cables:
>   *	the array of charger cables to enable/disable charger
>   *	and set current limit according to constratint data of
>   *	struct charger_cable if only charger cable included
>   *	in the array of charger cables is attached/detached.
>   * @num_cables: the number of charger cables.
> + * @attr_g: Attribute group for the charger(regulator)
> + * @attr_name: "name" sysfs entry
> + * @attr_state: "state" sysfs entry
> + * @attr_externally_control: "externally_control" sysfs entry
> + * @attrs: Arrays pointing to attr_name/state/externally_control for
> attr_g
>   */
>  struct charger_regulator {
>  	/* The name of regulator for charging */
>  	const char *regulator_name;
>  	struct regulator *consumer;
>
> +	/* charger never on when system is on */
> +	int externally_control;
> +
>  	/*
>  	 * Store constraint information related to current limit,
>  	 * each cable have different condition for charging.
>  	 */
>  	struct charger_cable *cables;
>  	int num_cables;
> +
> +	struct attribute_group attr_g;
> +	struct device_attribute attr_name;
> +	struct device_attribute attr_state;
> +	struct device_attribute attr_externally_control;
> +	struct attribute *attrs[4];
> +
> +	struct charger_manager *cm;
>  };
>
>  /**
> --
> 1.7.11.5
>
> --
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