linux-kernel - Re: [PATCH 3/3] IO: hid-sensor-magn-3d: Add in support for True/Magnetic North HID usages

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Date:	Wed, 28 May 2014 14:25:12 -0700
From:	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
To:	Reyad Attiyat <reyad.attiyat@...il.com>
CC:	linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
	jic23@...nel.org, linux-input <linux-input@...r.kernel.org>,
	Jiri Kosina <jkosina@...e.cz>
Subject: Re: [PATCH 3/3] IO: hid-sensor-magn-3d: Add in support for True/Magnetic
 North HID usages

On 05/28/2014 02:15 PM, Reyad Attiyat wrote:
>> +static void sensor_hub_fill_attr_info(
>> +               struct hid_sensor_hub_attribute_info *info,
>> +               s32 index, s32 report_id, struct hid_field *field)
>> +{
>> +       info->index = index;
>> +       info->report_id = report_id;
>> +       info->units = field->unit;
>> +       info->unit_expo = field->unit_exponent;
>> +       info->size = (field->report_size * field->report_count)/8;
>> +       info->logical_minimum = field->logical_minimum;
>> +       info->logical_maximum = field->logical_maximum;
>>   }
> I copied this function from hid/hid-sensor-hub.c as it is marked
> static in that file. I use it to fill attributes as I find them.
> Should I create an another patch to make it non-static?

I didn't check your implementation. But 
sensor_hub_input_get_attribute_info()
function is not enough? We are already using to get other attributes for 
x, y and Z.

Thanks,
Srinivas


>> +       list_for_each_entry(report, &report_enum->report_list, list) {
>> +               for (i = 0; i < report->maxfield; ++i) {
>> +                       field = report->field[i];
>> +
>> +                       for (j = 0; j < field->maxusage; j++) {
>> +                               usage = &(field->usage[j]);
>> +
> This is how I mange to find all possible hid reports in the parse
> reports function. I noticed that in the other function that was used,
> sensor_hub_input_get_attribute_info(),  it only uses field->usage[0].
> Is there a reason for this and should I change my current
> implementation?
>

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