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From: Florian Fainelli <f.fainelli@gmail.com>
To: linux-kernel@vger.kernel.org
Cc: bcm-kernel-feedback-list@broadcom.com,
	Florian Fainelli <f.fainelli@gmail.com>,
	Sudeep Holla <sudeep.holla@arm.com>,
	Jean Delvare <jdelvare@suse.com>,
	Guenter Roeck <linux@roeck-us.net>,
	linux-arm-kernel@lists.infradead.org,
	linux-hwmon@vger.kernel.org (open list:HARDWARE MONITORING)
Subject: [PATCH v4 0/2] hwmon: scmi: Scale values to target desired HWMON units
Date: Wed,  8 May 2019 10:00:33 -0700	[thread overview]
Message-ID: <20190508170035.19671-1-f.fainelli@gmail.com> (raw)

Hi Sudeep, Guenter,

This patch series adds support for scaling SCMI sensor values read from
firmware. Sudeep, let me know if you think we should be treating scale
== 0 as a special value to preserve some firmware compatibility (not
that this would be desired).

Changes in v4:
- deal with overflow in the caller of __pow10() as suggested by Guenter
  which makes us rework a bit how the value argument/return value are
  passed
- don't harcode the latest power of 10 factor to be 18, just rely on
  overflowing the u64 value instead

Changes in v3:

- add a local __pow10 function to scmi-hwmon.c while a plan to provide
  a generic function is figured out.
- add check on power > 18 which would overflow a 64-bit unsigned integer
- use div64_u64() to properly divide a 64-bit quantity with an unsigned
  64-bit quantity

Changes in v2:

- added a helper function in kernel.h: __pow10()
- made the scale in scmi_sensor_info an s8 type, added defines for
  checking the sign bit and sign extending with a mask
- simplify computations in hwmon driver

Florian Fainelli (2):
  firmware: arm_scmi: Fetch and store sensor scale
  hwmon: scmi: Scale values to target desired HWMON units

 drivers/firmware/arm_scmi/sensors.c |  6 ++++
 drivers/hwmon/scmi-hwmon.c          | 46 +++++++++++++++++++++++++++++
 include/linux/scmi_protocol.h       |  1 +
 3 files changed, 53 insertions(+)

-- 
2.17.1


             reply	other threads:[~2019-05-08 17:00 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-08 17:00 Florian Fainelli [this message]
2019-05-08 17:00 ` [PATCH v4 1/2] firmware: arm_scmi: Fetch and store sensor scale Florian Fainelli
2019-05-08 18:33   ` Guenter Roeck
2019-05-08 17:00 ` [PATCH v4 2/2] hwmon: scmi: Scale values to target desired HWMON units Florian Fainelli
2019-05-08 18:32   ` Guenter Roeck
2019-05-08 18:34     ` Florian Fainelli
2019-05-08 19:40       ` Guenter Roeck

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