linux-kernel - Re: [PATCH 3/3] iio: add rtc-driver for HID sensors of type time

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Date:	Sun, 09 Dec 2012 19:16:46 +0100
From:	Alexander Holler <holler@...oftware.de>
To:	Lars-Peter Clausen <lars@...afoo.de>
CC:	linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
	Jonathan Cameron <jic23@....ac.uk>, rtc-linux@...glegroups.com,
	Alessandro Zummo <a.zummo@...ertech.it>,
	srinivas pandruvada <srinivas.pandruvada@...el.com>
Subject: Re: [PATCH 3/3] iio: add rtc-driver for HID sensors of type time

Am 09.12.2012 17:40, schrieb Alexander Holler:
> Am 09.12.2012 13:55, schrieb Lars-Peter Clausen:
>> On 12/09/2012 01:21 PM, Alexander Holler wrote:
>>> This driver makes the time from HID sensors (hubs) which are offering
>>> such available like any other RTC does.
>>>
>>> Currently the time can only be read. Setting the time must be done
>>> through sending a report, which currently isn't supported by
>>> hid-sensor-hub.
>>>
>>> It is necessary that all values like year, month etc, are send as
>>> 8bit values (1 byte each) and all of them in 1 report. Also the
>>> spec HUTRR39b doesn't define the range of the year field, we
>>> tread it as 0 - 99 because that's what most RTCs I know about are
>>> offering.
>>
>> I don't think we should register a IIO device for this. Just an RTC
>> device
>> should be fully sufficient.
>>
>
> You would have to implement all the used services hid-sensor-hub offers
> in the rtc-driver again.

Besides that, time is part of the spec for HID sensors, which makes 
sense. Making that available as a RTC to read/set the time is imho the 
best to way support that. If you want a driver which doesn't use the HID 
sensor hub framework (or iio), you would either have to define your own 
standard or make sure it is interoperable with the HID sensor hub 
framework, which might not be trivial.

Regards,

Alexander
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