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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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