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
next 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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