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 16:35:28 -0500
From:	Reyad Attiyat <reyad.attiyat@...il.com>
To:	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.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

Hey Srinivas,

Well I could use sensor_hub_input_get_attribute_info() for each usage
attribute. I was just thinking that since each usage attribute is
found in a row, one for each field I think, it'd be easier to create
iio channels that way. This would eliminate running the for loop
search for usage id each time.

I realize that my parse_report function is quite ugly espically ending
in four closing parenthesis and copying code from
sensor_hub_input_get_attribute_info(). I will change it if you don't
think it will slow down the driver or have any negative effects.

Thanks,
Reyad



On Wed, May 28, 2014 at 4:25 PM, Srinivas Pandruvada
<srinivas.pandruvada@...ux.intel.com> wrote:
> 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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