linux-kernel - Re: [PATCH v3 3/3] drivers:power:twl4030-charger: remove nonstandard max

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Date:   Fri, 12 May 2017 10:07:21 +0200
From:   "H. Nikolaus Schaller" <hns@...delico.com>
To:     Pavel Machek <pavel@....cz>
Cc:     Sebastian Reichel <sre@...nel.org>,
        Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Grazvydas Ignotas <notasas@...il.com>,
        Andreas Kemnade <andreas@...nade.info>,
        linux-pm@...r.kernel.org, letux-kernel@...nphoenux.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/3] drivers:power:twl4030-charger: remove nonstandard max_current sysfs attribute

Hi Pavel,

> Am 12.05.2017 um 00:35 schrieb Pavel Machek <pavel@....cz>:
> 
> On Fri 2017-04-14 20:25:57, H. Nikolaus Schaller wrote:
>> Signed-off-by: H. Nikolaus Schaller <hns@...delico.com>
> 
> You should explain how to obtain equivalent functionality without that
> attribute.

By using the standard attribute as defined here:

http://elixir.free-electrons.com/linux/latest/source/Documentation/power/power_supply_class.txt#L125

It was introduced by 6bb1d272d7c9f.

This patch 3/3 here was intended to follow right after the one that adds the
input_current_limit property where it is (partially) described.

https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=3fb319c2cdcd10f775f4d4a05a7d12fa1a5679c1

But since the patches are broken apart now, we should indeed document this
explicitly in the commit message to avoid any confusion. I had already
planned that for the next patch version.

BR,
Nikolaus

> 
> 									Pavel
> 
>> ---
>> drivers/power/supply/twl4030_charger.c | 63 ----------------------------------
>> 1 file changed, 63 deletions(-)
>> 
>> diff --git a/drivers/power/supply/twl4030_charger.c b/drivers/power/supply/twl4030_charger.c
>> index e70c4ed..e02e150 100644
>> --- a/drivers/power/supply/twl4030_charger.c
>> +++ b/drivers/power/supply/twl4030_charger.c
>> @@ -624,63 +624,6 @@ static irqreturn_t twl4030_bci_interrupt(int irq, void *arg)
>> 	return IRQ_HANDLED;
>> }
>> 
>> -/*
>> - * Provide "max_current" attribute in sysfs.
>> - */
>> -static ssize_t
>> -twl4030_bci_max_current_store(struct device *dev, struct device_attribute *attr,
>> -	const char *buf, size_t n)
>> -{
>> -	struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
>> -	int cur = 0;
>> -	int status = 0;
>> -	status = kstrtoint(buf, 10, &cur);
>> -	if (status)
>> -		return status;
>> -	if (cur < 0)
>> -		return -EINVAL;
>> -	if (dev == &bci->ac->dev)
>> -		bci->ac_cur = cur;
>> -	else
>> -		bci->usb_cur_target = cur;
>> -
>> -	twl4030_charger_update_current(bci);
>> -	return n;
>> -}
>> -
>> -/*
>> - * sysfs max_current show
>> - */
>> -static ssize_t twl4030_bci_max_current_show(struct device *dev,
>> -	struct device_attribute *attr, char *buf)
>> -{
>> -	int status = 0;
>> -	int cur = -1;
>> -	u8 bcictl1;
>> -	struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
>> -
>> -	if (dev == &bci->ac->dev) {
>> -		if (!bci->ac_is_active)
>> -			cur = bci->ac_cur;
>> -	} else {
>> -		if (bci->ac_is_active)
>> -			cur = bci->usb_cur_target;
>> -	}
>> -	if (cur < 0) {
>> -		cur = twl4030bci_read_adc_val(TWL4030_BCIIREF1);
>> -		if (cur < 0)
>> -			return cur;
>> -		status = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
>> -		if (status < 0)
>> -			return status;
>> -		cur = regval2ua(cur, bcictl1 & TWL4030_CGAIN);
>> -	}
>> -	return scnprintf(buf, PAGE_SIZE, "%u\n", cur);
>> -}
>> -
>> -static DEVICE_ATTR(max_current, 0644, twl4030_bci_max_current_show,
>> -			twl4030_bci_max_current_store);
>> -
>> static void twl4030_bci_usb_work(struct work_struct *data)
>> {
>> 	struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work);
>> @@ -1118,14 +1061,10 @@ static int twl4030_bci_probe(struct platform_device *pdev)
>> 		dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
>> 
>> 	twl4030_charger_update_current(bci);
>> -	if (device_create_file(&bci->usb->dev, &dev_attr_max_current))
>> -		dev_warn(&pdev->dev, "could not create sysfs file\n");
>> 	if (device_create_file(&bci->usb->dev, &dev_attr_mode))
>> 		dev_warn(&pdev->dev, "could not create sysfs file\n");
>> 	if (device_create_file(&bci->ac->dev, &dev_attr_mode))
>> 		dev_warn(&pdev->dev, "could not create sysfs file\n");
>> -	if (device_create_file(&bci->ac->dev, &dev_attr_max_current))
>> -		dev_warn(&pdev->dev, "could not create sysfs file\n");
>> 
>> 	twl4030_charger_enable_ac(bci, true);
>> 	if (!IS_ERR_OR_NULL(bci->transceiver))
>> @@ -1157,9 +1096,7 @@ static int __exit twl4030_bci_remove(struct platform_device *pdev)
>> 
>> 	iio_channel_release(bci->channel_vac);
>> 
>> -	device_remove_file(&bci->usb->dev, &dev_attr_max_current);
>> 	device_remove_file(&bci->usb->dev, &dev_attr_mode);
>> -	device_remove_file(&bci->ac->dev, &dev_attr_max_current);
>> 	device_remove_file(&bci->ac->dev, &dev_attr_mode);
>> 	/* mask interrupts */
>> 	twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
> 
> --
> (english) http://www.livejournal.com/~pavelmachek
> (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html


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