linux-kernel - Re: [PATCH V3 11/11] power: charger-manager: Support to change polling rate in runtime.

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Message-ID: <20141220002908.GD1694@amd>
Date:	Sat, 20 Dec 2014 01:29:08 +0100
From:	Pavel Machek <pavel@....cz>
To:	Jonghwa Lee <jonghwa3.lee@...sung.com>
Cc:	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	sre@...nel.org, dbaryshkov@...il.com, dwmw2@...radead.org,
	anton@...msg.org, myungjoo.ham@...sung.com, cw00.choi@...sung.com
Subject: Re: [PATCH V3 11/11] power: charger-manager: Support to change
 polling rate in runtime.


> Add 'polling_ms' sysfs node to change charger-manager's monitoring rate
> in runtime. It can set only bigger than 2 jiffies (for 200 HZ system it
> is 10 msecs.) as it's allowed for minimum poling rate in previous.

New sysfs filesneed documentation.

> It resets poller and re-configure polling rate based on new input if next

re-configures...", if"

> polling time is far enough. Otherwise, it just waits expiration of timer

"waits for"

> and new polling rate will affects the next scheduling.

"affect"?


> +static ssize_t show_polling_ms(struct device *dev,
> +				struct device_attribute *attr, char *buf)
> +{
> +	struct charger_manager *cm;
> +	ssize_t len;
> +
> +	list_for_each_entry(cm, &cm_list, entry)
> +		if (cm->charger_psy.dev == dev)
> +			break;
> +
> +	if (cm->charger_psy.dev != dev)
> +		return -EINVAL;

Any chance to reorganize data structures so that this kind of list
walking is not neccessary?

> +static ssize_t store_polling_ms(struct device *dev,
> +				struct device_attribute *attr, const char *buf,
> +				size_t count)
> +{
> +	struct charger_manager *cm;
> +	int polling_ms;
> +	int ret;
> +
> +	ret = sscanf(buf, "%d", &polling_ms);

"kstrtoul"?

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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