Date:	Sun, 1 Nov 2015 18:35:54 +0000
From:	Jonathan Cameron <jic23@...nel.org>
To:	"Andrew F. Davis" <afd@...com>, Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Hartmut Knaack <knaack.h@....de>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Peter Meerwald <pmeerw@...erw.net>
Cc:	devicetree@...r.kernel.org, linux-iio@...r.kernel.org,
	linux-api@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] iio: Heart Rate Monitors

On 31/10/15 16:31, Andrew F. Davis wrote:
> Hello all,
> 
> This series adds the TI AFE4404 "Ultra-small, Integrated AFE for
> Wearable, Optical Heart Rate Monitoring and Bio-Sensing".
> 
> This work is based on previous work by Dan Murphy [0] who is working
> on other tasks at the moment, so I will be helping to continue
> upstreaming this driver. This is more of a re-write than a continuation
> and there are many changes so I am submitting this as a v1.
> 
> This device is very similar to the AFE4403 and I was originally planning
> on pushing the two drivers together with common core functions in a
> third file. The AFE4403 driver is still being tested so I merged common
> code back into this driver, this is why this driver may seem a bit
> unnecessarily modular. I will probably split this stuff back out when
> I push the AFE4403.
> 
> I also had some issues with sysfs naming for the channels; this device
> has three input channels from three LED stages and two ambient
> channels based on the LED stages. This might have been be a good place
> for using IIO modifiers[1], but we also have two differential channels
> based on the ambient channels, and channels cannot have both modifiers
> and be differential (the modifier is stored in the differential channel's
> ID field?).
True enough. Didn't expect to run into this particular problem, but I guess
someone will always make hardware breaking any assumptions we make from the
software side of things.
 So I used sysfs names that would be close to what they
> would be if IIO supported these things.
Fair enough as a starting point though we probably want to figure out how
to do this 'right'.   Adding an extra field to the channel descriptor will
be easy enough - it'll be event codes that are nasty to handle.

Jonathan
> 
> [0] http://www.spinics.net/lists/linux-iio/msg18413.html
> [1] IIO_MOD_TEMP_AMBIENT could be renamed IIO_MOD_AMBIENT as it can
> also apply to LIGHT, PRESSURE, HUMIDITY, etc..
No problem with this change so please send a patch.
> 
> Thanks,
> Andrew
> 
> Andrew F. Davis (2):
>   Documentation: afe4404: Add DT bindings for the AFE4404 heart monitor
>   iio: health: Add driver for the TI AFE4404 heart monitor
> 
>  .../ABI/testing/sysfs-bus-iio-health-afe4404       |  70 +++
>  .../devicetree/bindings/iio/health/afe4404.txt     |  27 ++
>  drivers/iio/Kconfig                                |   1 +
>  drivers/iio/Makefile                               |   1 +
>  drivers/iio/health/Kconfig                         |  24 +
>  drivers/iio/health/Makefile                        |   6 +
>  drivers/iio/health/afe4404.c                       | 526 +++++++++++++++++++++
>  drivers/iio/health/afe440x.h                       | 159 +++++++
>  8 files changed, 814 insertions(+)
>  create mode 100644 Documentation/ABI/testing/sysfs-bus-iio-health-afe4404
>  create mode 100644 Documentation/devicetree/bindings/iio/health/afe4404.txt
>  create mode 100644 drivers/iio/health/Kconfig
>  create mode 100644 drivers/iio/health/Makefile
>  create mode 100644 drivers/iio/health/afe4404.c
>  create mode 100644 drivers/iio/health/afe440x.h
> 

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