linux-kernel - Re: [PATCH v2] add support for Freescale's MMA8653FC 10 bit accelerometer

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Date:	Wed, 18 Mar 2015 17:42:13 +0100
From:	Martin Kepplinger <martink@...teo.de>
To:	Alexander Stein <alexander.stein@...tec-electronic.com>
CC:	robh+dt@...nel.org, pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	dmitry.torokhov@...il.com, akpm@...ux-foundation.org,
	gregkh@...uxfoundation.org, linux-api@...r.kernel.org,
	devicetree@...r.kernel.org, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Martin Kepplinger <martin.kepplinger@...obroma-systems.com>,
	Christoph Muellner <christoph.muellner@...obroma-systems.com>
Subject: Re: [PATCH v2] add support for Freescale's MMA8653FC 10 bit accelerometer

Am 2015-03-18 um 17:21 schrieb Alexander Stein:
> On Wednesday 18 March 2015 16:55:57, Martin Kepplinger wrote:
>> From: Martin Kepplinger <martin.kepplinger@...obroma-systems.com>
>>
>> The MMA8653FC is a low-power, three-axis, capacitive micromachined
>> accelerometer with 10 bits of resolution with flexible user-programmable
>> options.
>>
>> Embedded interrupt functions enable overall power savings, by relieving the
>> host processor from continuously polling data, for example using the poll()
>> system call.
>>
>> The device can be configured to generate wake-up interrupt signals from any
>> combination of the configurable embedded functions, enabling the MMA8653FC
>> to monitor events while remaining in a low-power mode during periods of
>> inactivity.
>>
>> This driver provides devicetree properties to program the device's behaviour
>> and a simple, tested and documented sysfs interface. The data sheet and more
>> information is available on Freescale's website.
>>
>> Signed-off-by: Martin Kepplinger <martin.kepplinger@...obroma-systems.com>
>> Signed-off-by: Christoph Muellner <christoph.muellner@...obroma-systems.com>
>> ---
>> applies to v4.0-rc4 and the current -next.
>>
>> patch revision history
>> ......................
>> v2 corrects licensing and commit messages and adds appropriate recipients
>>
>>  .../testing/sysfs-bus-i2c-devices-fsl-mma8653fc    |  39 +
>>  .../devicetree/bindings/misc/fsl,mma8653fc.txt     |  96 +++
>>  MAINTAINERS                                        |   5 +
>>  drivers/input/misc/Kconfig                         |  11 +
>>  drivers/input/misc/Makefile                        |   1 +
>>  drivers/input/misc/mma8653fc.c                     | 913 +++++++++++++++++++++
>>  6 files changed, 1065 insertions(+)
>>  create mode 100644 Documentation/ABI/testing/sysfs-bus-i2c-devices-fsl-mma8653fc
>>  create mode 100644 Documentation/devicetree/bindings/misc/fsl,mma8653fc.txt
>>  create mode 100644 drivers/input/misc/mma8653fc.c
> 
> Shouldn't this go to drivers/iio/magnetometer instead of defining a new sysfs ABI?
> 

It could have gone to drivers/iio/accel if it would use an iio
interface, which would make more sense, you are right, but I simply
don't have the time to merge it in to iio.

It doesn't use an input interface either but I don't see a good place
for an accelerometer that uses sysfs only.

It works well, is a relatively recent chip and a clean dirver. But this
is all I can provide.

> Best regards,
> Alexander
> 

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