linux-kernel - Re: [PATCH v2 1/2] Changes in w1_therm.c and adding w1

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Message-ID: <1b002fb8caf1755b89882fd7a3bbac1565959a6d.camel@gmail.com>
Date:   Sun, 26 Apr 2020 14:36:52 +0200
From:   Akira shimahara <akira215corp@...il.com>
To:     Greg KH <greg@...ah.com>
Cc:     zbr@...emap.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] Changes in w1_therm.c and adding w1_therm.h

Le dimanche 26 avril 2020 à 09:51 +0200, Greg KH a écrit :
> On Sat, Apr 25, 2020 at 05:31:41PM +0200, Akira Shimahara wrote:
> > From: Akira SHIMAHARA <akira215corp@...il.com>
> > 
> > Patch for enhacement of w1_therm module. Added features :
> >  - Bulk read : send one command for all the slaves
> >  		on the bus to trigger temperature conversion
> >  - Optimized conversion time regarding to device resolution
> >  - Dedicated sysfs entry for powering read,
> >  		resolution set/get, eeprom save/restore
> >  - Alarms settings and reading
> >  - Code optimization to mitigate bus traffic
> >  		(devices information are stored to avoid
> > 		interrogating each device every-time)
> > 
> > Following sysfs entry are added :
> >  - temperature (RO) : return the temperature in 1/1000°
> >  - ext_power (RO) : return the power status of the device
> >  - resolution (RW) : get or set the device resolution (supported
> > devices)
> >  - eeprom (WO) :trigger a save or restore to/from device EEPROM
> >  - alarms (RW) : read or write TH and TL in the device RAM
> >  - therm_bulk_read (RW) : Attribute at master level to trigger
> >  		bulk read and to survey the progress of devices
> > conversions
> >  - w1_slave has been kept for compatibility
> > 
> > Main motivation was to improve temperature reading speed, which
> > depend
> > on resolution settings of devices. The module store the powwer
> > status and
> > the resolution of each device so that during reading operation, no
> > transaction is required on the bus, which improve speed.
> > The hardware status is checked as soon as a new device is
> > detected, 
> > when a user change occurred, or when the corresponding sys file is 
> > accessed by user.
> > 
> > The bulk read allow to trigger convserion of all devices on the bus
> > at
> > the same time. It will apply a strong pull up on the line if at
> > least
> > one device required it. The duration of the pull up is the max time
> > required by a device on the line.
> > 
> > Please let me know any feedback you have on this patch.
> > 
> > Thanks ahead,
> > 
> > Signed-off-by: Akira Shimahara <akira215corp@...il.com>
> > ---
> > Changes in v2:
> >  - Adding documentation in Documentatin/ABI/testing/sysfs-driver-
> > w1_therm
> >  - Updating existing documentation in
> > Documentation/w1/slaves/w1_therm.rst
> > 
> >  drivers/w1/slaves/w1_therm.c | 1406 ++++++++++++++++++++++++++--
> > ------
> >  drivers/w1/slaves/w1_therm.h |  386 ++++++++++
> >  2 files changed, 1470 insertions(+), 322 deletions(-)
> >  create mode 100644 drivers/w1/slaves/w1_therm.h
> 
> No documentation files are added here :(
> 

It's in the PATCH 2/2 included in the previous mail. You want me to
merge in one commit ?. I thought it was easier for you to keep a track
of the v1.

Let me know what you prefer.

Thanks ahead

Akira SHIMAHARA