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SubjectRe: [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@gmail.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@gmail.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 :(

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