linux-kernel - Re: [PATCH 1/3] iio: mma8452: add freefall detection for Freescale's accelerometers

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Date:	Thu, 12 Nov 2015 16:00:10 +0100
From:	Martin Kepplinger <martink@...teo.de>
To:	Lars-Peter Clausen <lars@...afoo.de>, jic23@...nel.org,
	knaack.h@....de, pmeerw@...erw.net,
	christoph.muellner@...obroma-systems.com, mfuzzey@...keon.com
CC:	linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
	Martin Kepplinger <martin.kepplinger@...obroma-systems.com>
Subject: Re: [PATCH 1/3] iio: mma8452: add freefall detection for Freescale's
 accelerometers

Am 2015-11-11 um 20:08 schrieb Lars-Peter Clausen:
> On 11/11/2015 07:38 PM, Martin Kepplinger wrote:
>> This adds freefall event detection to the supported devices. It adds the 
>> in_accel_x&y&z_mag_falling_en iio event attribute, which activates 
>> freefall mode.
>>
> 
> Hi,
> 
> Thanks for the patch, looks pretty good. Just a few things.
> 
>> In freefall mode, the current acceleration values of all activated axis 
>> are added and if the *sum* falls *under* the threshold specified
> 
> Are you sure its not the magnitude of the vector rather than the sum of the
> individual components?

It's the acceleration magnitude, logical AND combination of the values.
Will correct this for v2.

> 
>> (in_accel_mag_falling_value), the appropriate IIO event code is 
>> generated.
> [...]
>> +enum { +	axis_x, +	axis_y, +	axis_z, +};
> 
> That should be part of patch two I guess.

Will do.

> 
> [...]
>> +static IIO_DEVICE_ATTR_NAMED(accel_xayaz_mag_falling_en, + 
>> in_accel_x&y&z_mag_falling_en, +			     S_IRUGO | S_IWUSR, + 
>> mma8452_get_freefall_mode, +			     mma8452_set_freefall_mode, + 0);
> 
> This should be created by the core based on the event spec, shouldn't it?
> 

I'll check if this works when I get to it.

thanks for the review!

                                  martin

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