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From: Baolin Wang <baolin.wang@linaro.org>
Newsgroups: linux.kernel
Subject: Re: [PATCH v6 1/4] gadget: Introduce the usb charger framework
Date: Mon, 07 Dec 2015 06:30:01 +0100
Message-ID: <qCWx3-eR-5@gated-at.bofh.it>
References: <qvlCh-3LQ-1@gated-at.bofh.it> <qvlCi-3LQ-9@gated-at.bofh.it> <qCnSF-3my-1@gated-at.bofh.it>
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On 6 December 2015 at 00:27, Sebastian Reichel <sre@kernel.org> wrote:
> 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).
>

That sounds reasonable and I'll change that. Thanks.

> -- Sebastian



-- 
Baolin.wang
Best Regards
--
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