linux-kernel - Re: [PATCH v6 1/4] gadget: Introduce the usb charger framework

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Date:	Sat, 5 Dec 2015 17:27:21 +0100
From:	Sebastian Reichel <sre@...nel.org>
To:	Baolin Wang <baolin.wang@...aro.org>
Cc:	balbi@...com, gregkh@...uxfoundation.org, dbaryshkov@...il.com,
	dwmw2@...radead.org, peter.chen@...escale.com,
	stern@...land.harvard.edu, r.baldyga@...sung.com,
	yoshihiro.shimoda.uh@...esas.com, lee.jones@...aro.org,
	broonie@...nel.org, ckeepax@...nsource.wolfsonmicro.com,
	patches@...nsource.wolfsonmicro.com, linux-pm@...r.kernel.org,
	linux-usb@...r.kernel.org,
	device-mainlining@...ts.linuxfoundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 1/4] gadget: Introduce the usb charger framework

Hi,

On Mon, Nov 16, 2015 at 02:33:31PM +0800, Baolin Wang wrote:
> +static ssize_t cur_limit_show(struct device *dev,
> +			      struct device_attribute *attr,
> +			      char *buf)
> +{
> +	struct usb_charger *uchger = dev_to_uchger(dev);
> +
> +	return scnprintf(buf, PAGE_SIZE, "%d %d %d %d\n",
> +			 uchger->cur_limit.sdp_cur_limit,
> +			 uchger->cur_limit.dcp_cur_limit,
> +			 uchger->cur_limit.cdp_cur_limit,
> +			 uchger->cur_limit.aca_cur_limit);
> +}
> +
> +static ssize_t cur_limit_store(struct device *dev,
> +			       struct device_attribute *attr,
> +			       const char *buf, size_t count)
> +{
> +	struct usb_charger *uchger = dev_to_uchger(dev);
> +	struct usb_charger_cur_limit cur;
> +	int ret;
> +
> +	ret = sscanf(buf, "%d %d %d %d",
> +		     &cur.sdp_cur_limit, &cur.dcp_cur_limit,
> +		     &cur.cdp_cur_limit, &cur.aca_cur_limit);
> +	if (ret == 0)
> +		return -EINVAL;
> +
> +	ret = usb_charger_set_cur_limit(uchger, &cur);
> +	if (ret < 0)
> +		return ret;
> +
> +	return count;
> +}
> +static DEVICE_ATTR_RW(cur_limit);

I think this functionality should be provided with one file per
type. This makes it easier to parse the values from userspace
and makes it possible to extend the frameworks functionality
(e.g. when new types are added in a newer revision of the USB
standard).

-- Sebastian

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