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

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Date:   Sun, 26 Apr 2020 09:51:41 +0200
From:   Greg KH <greg@...ah.com>
To:     Akira Shimahara <akira215corp@...il.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

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 :(