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@@ -0,0 +1,737 @@
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+From 5b46903d8bf372e563bf2150d46b87fff197a109 Mon Sep 17 00:00:00 2001
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+From: Guenter Roeck <[email protected]>
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+Date: Thu, 28 Nov 2019 21:34:40 -0800
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+Subject: [PATCH] hwmon: Driver for disk and solid state drives with
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+ temperature sensors
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+MIME-Version: 1.0
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+Content-Type: text/plain; charset=UTF-8
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+Content-Transfer-Encoding: 8bit
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+
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+Reading the temperature of ATA drives has been supported for years
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+by userspace tools such as smarttools or hddtemp. The downside of
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+such tools is that they need to run with super-user privilege, that
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+the temperatures are not reported by standard tools such as 'sensors'
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+or 'libsensors', and that drive temperatures are not available for use
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+in the kernel's thermal subsystem.
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+
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+This driver solves this problem by adding support for reading the
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+temperature of ATA drives from the kernel using the hwmon API and
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+by adding a temperature zone for each drive.
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+
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+With this driver, the hard disk temperature can be read using the
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+unprivileged 'sensors' application:
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+
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+$ sensors drivetemp-scsi-1-0
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+drivetemp-scsi-1-0
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+Adapter: SCSI adapter
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+temp1: +23.0°C
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+
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+or directly from sysfs:
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+
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+$ grep . /sys/class/hwmon/hwmon9/{name,temp1_input}
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+/sys/class/hwmon/hwmon9/name:drivetemp
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+/sys/class/hwmon/hwmon9/temp1_input:23000
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+
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+If the drive supports SCT transport and reports temperature limits,
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+those are reported as well.
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+
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+drivetemp-scsi-0-0
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+Adapter: SCSI adapter
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+temp1: +27.0°C (low = +0.0°C, high = +60.0°C)
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+ (crit low = -41.0°C, crit = +85.0°C)
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+ (lowest = +23.0°C, highest = +34.0°C)
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+
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+The driver attempts to use SCT Command Transport to read the drive
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+temperature. If the SCT Command Transport feature set is not available,
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+or if it does not report the drive temperature, drive temperatures may
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+be readable through SMART attributes. Since SMART attributes are not well
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+defined, this method is only used as fallback mechanism.
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+
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+Cc: Chris Healy <[email protected]>
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+Cc: Linus Walleij <[email protected]>
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+Cc: Martin K. Petersen <[email protected]>
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+Cc: Bart Van Assche <[email protected]>
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+Reviewed-by: Linus Walleij <[email protected]>
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+Tested-by: Linus Walleij <[email protected]>
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+Signed-off-by: Guenter Roeck <[email protected]>
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+---
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+ Documentation/hwmon/drivetemp.rst | 52 +++
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+ Documentation/hwmon/index.rst | 1 +
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+ drivers/hwmon/Kconfig | 10 +
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+ drivers/hwmon/Makefile | 1 +
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+ drivers/hwmon/drivetemp.c | 574 ++++++++++++++++++++++++++++++
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+ 5 files changed, 638 insertions(+)
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+ create mode 100644 Documentation/hwmon/drivetemp.rst
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+ create mode 100644 drivers/hwmon/drivetemp.c
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+
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+--- /dev/null
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++++ b/Documentation/hwmon/drivetemp.rst
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+@@ -0,0 +1,52 @@
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++.. SPDX-License-Identifier: GPL-2.0
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++
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++Kernel driver drivetemp
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++=======================
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++
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++
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++References
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++----------
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++
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++ANS T13/1699-D
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++Information technology - AT Attachment 8 - ATA/ATAPI Command Set (ATA8-ACS)
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++
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++ANS Project T10/BSR INCITS 513
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++Information technology - SCSI Primary Commands - 4 (SPC-4)
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++
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++ANS Project INCITS 557
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++Information technology - SCSI / ATA Translation - 5 (SAT-5)
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++
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++
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++Description
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++-----------
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++
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++This driver supports reporting the temperature of disk and solid state
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++drives with temperature sensors.
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++
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++If supported, it uses the ATA SCT Command Transport feature to read
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++the current drive temperature and, if available, temperature limits
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++as well as historic minimum and maximum temperatures. If SCT Command
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++Transport is not supported, the driver uses SMART attributes to read
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++the drive temperature.
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++
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++
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++Sysfs entries
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++-------------
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++
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++Only the temp1_input attribute is always available. Other attributes are
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++available only if reported by the drive. All temperatures are reported in
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++milli-degrees Celsius.
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++
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++======================= =====================================================
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++temp1_input Current drive temperature
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++temp1_lcrit Minimum temperature limit. Operating the device below
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++ this temperature may cause physical damage to the
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++ device.
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++temp1_min Minimum recommended continuous operating limit
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++temp1_max Maximum recommended continuous operating temperature
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++temp1_crit Maximum temperature limit. Operating the device above
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++ this temperature may cause physical damage to the
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++ device.
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++temp1_lowest Minimum temperature seen this power cycle
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++temp1_highest Maximum temperature seen this power cycle
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++======================= =====================================================
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+--- a/Documentation/hwmon/index.rst
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++++ b/Documentation/hwmon/index.rst
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+@@ -45,6 +45,7 @@ Hardware Monitoring Kernel Drivers
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+ da9052
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+ da9055
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+ dme1737
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++ drivetemp
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+ ds1621
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+ ds620
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+ emc1403
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+--- a/drivers/hwmon/Kconfig
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++++ b/drivers/hwmon/Kconfig
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+@@ -385,6 +385,16 @@ config SENSORS_ATXP1
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+ This driver can also be built as a module. If so, the module
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+ will be called atxp1.
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+
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++config SENSORS_DRIVETEMP
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++ tristate "Hard disk drives with temperature sensors"
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++ depends on SCSI && ATA
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++ help
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++ If you say yes you get support for the temperature sensor on
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++ hard disk drives.
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++
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++ This driver can also be built as a module. If so, the module
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++ will be called satatemp.
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++
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+ config SENSORS_DS620
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+ tristate "Dallas Semiconductor DS620"
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+ depends on I2C
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+--- a/drivers/hwmon/Makefile
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++++ b/drivers/hwmon/Makefile
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+@@ -56,6 +56,7 @@ obj-$(CONFIG_SENSORS_DA9052_ADC)+= da905
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+ obj-$(CONFIG_SENSORS_DA9055)+= da9055-hwmon.o
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+ obj-$(CONFIG_SENSORS_DELL_SMM) += dell-smm-hwmon.o
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+ obj-$(CONFIG_SENSORS_DME1737) += dme1737.o
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++obj-$(CONFIG_SENSORS_DRIVETEMP) += drivetemp.o
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+ obj-$(CONFIG_SENSORS_DS620) += ds620.o
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+ obj-$(CONFIG_SENSORS_DS1621) += ds1621.o
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+ obj-$(CONFIG_SENSORS_EMC1403) += emc1403.o
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+--- /dev/null
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++++ b/drivers/hwmon/drivetemp.c
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+@@ -0,0 +1,574 @@
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++// SPDX-License-Identifier: GPL-2.0
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++/*
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++ * Hwmon client for disk and solid state drives with temperature sensors
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++ * Copyright (C) 2019 Zodiac Inflight Innovations
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++ *
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++ * With input from:
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++ * Hwmon client for S.M.A.R.T. hard disk drives with temperature sensors.
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++ * (C) 2018 Linus Walleij
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++ *
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++ * hwmon: Driver for SCSI/ATA temperature sensors
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++ * by Constantin Baranov <[email protected]>, submitted September 2009
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++ *
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++ * This drive supports reporting the temperatire of SATA drives. It can be
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++ * easily extended to report the temperature of SCSI drives.
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++ *
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++ * The primary means to read drive temperatures and temperature limits
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++ * for ATA drives is the SCT Command Transport feature set as specified in
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++ * ATA8-ACS.
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++ * It can be used to read the current drive temperature, temperature limits,
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++ * and historic minimum and maximum temperatures. The SCT Command Transport
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++ * feature set is documented in "AT Attachment 8 - ATA/ATAPI Command Set
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++ * (ATA8-ACS)".
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++ *
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++ * If the SCT Command Transport feature set is not available, drive temperatures
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++ * may be readable through SMART attributes. Since SMART attributes are not well
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++ * defined, this method is only used as fallback mechanism.
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++ *
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++ * There are three SMART attributes which may report drive temperatures.
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++ * Those are defined as follows (from
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++ * http://www.cropel.com/library/smart-attribute-list.aspx).
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++ *
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++ * 190 Temperature Temperature, monitored by a sensor somewhere inside
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++ * the drive. Raw value typicaly holds the actual
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++ * temperature (hexadecimal) in its rightmost two digits.
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++ *
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++ * 194 Temperature Temperature, monitored by a sensor somewhere inside
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++ * the drive. Raw value typicaly holds the actual
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++ * temperature (hexadecimal) in its rightmost two digits.
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++ *
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++ * 231 Temperature Temperature, monitored by a sensor somewhere inside
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++ * the drive. Raw value typicaly holds the actual
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++ * temperature (hexadecimal) in its rightmost two digits.
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++ *
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++ * Wikipedia defines attributes a bit differently.
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++ *
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++ * 190 Temperature Value is equal to (100-temp. °C), allowing manufacturer
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++ * Difference or to set a minimum threshold which corresponds to a
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++ * Airflow maximum temperature. This also follows the convention of
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++ * Temperature 100 being a best-case value and lower values being
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++ * undesirable. However, some older drives may instead
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++ * report raw Temperature (identical to 0xC2) or
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++ * Temperature minus 50 here.
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++ * 194 Temperature or Indicates the device temperature, if the appropriate
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++ * Temperature sensor is fitted. Lowest byte of the raw value contains
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++ * Celsius the exact temperature value (Celsius degrees).
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++ * 231 Life Left Indicates the approximate SSD life left, in terms of
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++ * (SSDs) or program/erase cycles or available reserved blocks.
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++ * Temperature A normalized value of 100 represents a new drive, with
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++ * a threshold value at 10 indicating a need for
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++ * replacement. A value of 0 may mean that the drive is
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++ * operating in read-only mode to allow data recovery.
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++ * Previously (pre-2010) occasionally used for Drive
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++ * Temperature (more typically reported at 0xC2).
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++ *
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++ * Common denominator is that the first raw byte reports the temperature
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++ * in degrees C on almost all drives. Some drives may report a fractional
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++ * temperature in the second raw byte.
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++ *
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++ * Known exceptions (from libatasmart):
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++ * - SAMSUNG SV0412H and SAMSUNG SV1204H) report the temperature in 10th
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++ * degrees C in the first two raw bytes.
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++ * - A few Maxtor drives report an unknown or bad value in attribute 194.
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++ * - Certain Apple SSD drives report an unknown value in attribute 190.
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++ * Only certain firmware versions are affected.
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++ *
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++ * Those exceptions affect older ATA drives and are currently ignored.
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++ * Also, the second raw byte (possibly reporting the fractional temperature)
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++ * is currently ignored.
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++ *
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++ * Many drives also report temperature limits in additional SMART data raw
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++ * bytes. The format of those is not well defined and varies widely.
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++ * The driver does not currently attempt to report those limits.
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++ *
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++ * According to data in smartmontools, attribute 231 is rarely used to report
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++ * drive temperatures. At the same time, several drives report SSD life left
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++ * in attribute 231, but do not support temperature sensors. For this reason,
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++ * attribute 231 is currently ignored.
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++ *
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++ * Following above definitions, temperatures are reported as follows.
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++ * If SCT Command Transport is supported, it is used to read the
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++ * temperature and, if available, temperature limits.
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++ * - Otherwise, if SMART attribute 194 is supported, it is used to read
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++ * the temperature.
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++ * - Otherwise, if SMART attribute 190 is supported, it is used to read
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++ * the temperature.
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++ */
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++
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++#include <linux/ata.h>
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++#include <linux/bits.h>
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++#include <linux/device.h>
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++#include <linux/hwmon.h>
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++#include <linux/kernel.h>
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++#include <linux/list.h>
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++#include <linux/module.h>
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++#include <linux/mutex.h>
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++#include <scsi/scsi_cmnd.h>
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++#include <scsi/scsi_device.h>
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++#include <scsi/scsi_driver.h>
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++#include <scsi/scsi_proto.h>
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++
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++struct drivetemp_data {
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++ struct list_head list; /* list of instantiated devices */
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++ struct mutex lock; /* protect data buffer accesses */
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++ struct scsi_device *sdev; /* SCSI device */
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++ struct device *dev; /* instantiating device */
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++ struct device *hwdev; /* hardware monitoring device */
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++ u8 smartdata[ATA_SECT_SIZE]; /* local buffer */
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++ int (*get_temp)(struct drivetemp_data *st, u32 attr, long *val);
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++ bool have_temp_lowest; /* lowest temp in SCT status */
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++ bool have_temp_highest; /* highest temp in SCT status */
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++ bool have_temp_min; /* have min temp */
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++ bool have_temp_max; /* have max temp */
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++ bool have_temp_lcrit; /* have lower critical limit */
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++ bool have_temp_crit; /* have critical limit */
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++ int temp_min; /* min temp */
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++ int temp_max; /* max temp */
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++ int temp_lcrit; /* lower critical limit */
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++ int temp_crit; /* critical limit */
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++};
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++
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++static LIST_HEAD(drivetemp_devlist);
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++
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++#define ATA_MAX_SMART_ATTRS 30
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++#define SMART_TEMP_PROP_190 190
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++#define SMART_TEMP_PROP_194 194
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++
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++#define SCT_STATUS_REQ_ADDR 0xe0
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++#define SCT_STATUS_VERSION_LOW 0 /* log byte offsets */
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++#define SCT_STATUS_VERSION_HIGH 1
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++#define SCT_STATUS_TEMP 200
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++#define SCT_STATUS_TEMP_LOWEST 201
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++#define SCT_STATUS_TEMP_HIGHEST 202
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++#define SCT_READ_LOG_ADDR 0xe1
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++#define SMART_READ_LOG 0xd5
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++#define SMART_WRITE_LOG 0xd6
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++
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++#define INVALID_TEMP 0x80
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++
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++#define temp_is_valid(temp) ((temp) != INVALID_TEMP)
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++#define temp_from_sct(temp) (((s8)(temp)) * 1000)
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++
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++static inline bool ata_id_smart_supported(u16 *id)
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++{
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++ return id[ATA_ID_COMMAND_SET_1] & BIT(0);
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++}
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++
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++static inline bool ata_id_smart_enabled(u16 *id)
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++{
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++ return id[ATA_ID_CFS_ENABLE_1] & BIT(0);
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++}
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++
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++static int drivetemp_scsi_command(struct drivetemp_data *st,
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++ u8 ata_command, u8 feature,
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++ u8 lba_low, u8 lba_mid, u8 lba_high)
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++{
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++ u8 scsi_cmd[MAX_COMMAND_SIZE];
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++ int data_dir;
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++
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++ memset(scsi_cmd, 0, sizeof(scsi_cmd));
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++ scsi_cmd[0] = ATA_16;
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++ if (ata_command == ATA_CMD_SMART && feature == SMART_WRITE_LOG) {
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++ scsi_cmd[1] = (5 << 1); /* PIO Data-out */
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++ /*
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++ * No off.line or cc, write to dev, block count in sector count
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++ * field.
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++ */
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++ scsi_cmd[2] = 0x06;
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++ data_dir = DMA_TO_DEVICE;
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++ } else {
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++ scsi_cmd[1] = (4 << 1); /* PIO Data-in */
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++ /*
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++ * No off.line or cc, read from dev, block count in sector count
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++ * field.
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++ */
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++ scsi_cmd[2] = 0x0e;
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++ data_dir = DMA_FROM_DEVICE;
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++ }
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++ scsi_cmd[4] = feature;
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++ scsi_cmd[6] = 1; /* 1 sector */
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++ scsi_cmd[8] = lba_low;
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++ scsi_cmd[10] = lba_mid;
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++ scsi_cmd[12] = lba_high;
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++ scsi_cmd[14] = ata_command;
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++
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++ return scsi_execute_req(st->sdev, scsi_cmd, data_dir,
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++ st->smartdata, ATA_SECT_SIZE, NULL, HZ, 5,
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++ NULL);
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++}
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++
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++static int drivetemp_ata_command(struct drivetemp_data *st, u8 feature,
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++ u8 select)
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++{
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++ return drivetemp_scsi_command(st, ATA_CMD_SMART, feature, select,
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++ ATA_SMART_LBAM_PASS, ATA_SMART_LBAH_PASS);
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++}
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++
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++static int drivetemp_get_smarttemp(struct drivetemp_data *st, u32 attr,
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++ long *temp)
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++{
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++ u8 *buf = st->smartdata;
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++ bool have_temp = false;
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++ u8 temp_raw;
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++ u8 csum;
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++ int err;
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|
|
++ int i;
|
|
|
++
|
|
|
++ err = drivetemp_ata_command(st, ATA_SMART_READ_VALUES, 0);
|
|
|
++ if (err)
|
|
|
++ return err;
|
|
|
++
|
|
|
++ /* Checksum the read value table */
|
|
|
++ csum = 0;
|
|
|
++ for (i = 0; i < ATA_SECT_SIZE; i++)
|
|
|
++ csum += buf[i];
|
|
|
++ if (csum) {
|
|
|
++ dev_dbg(&st->sdev->sdev_gendev,
|
|
|
++ "checksum error reading SMART values\n");
|
|
|
++ return -EIO;
|
|
|
++ }
|
|
|
++
|
|
|
++ for (i = 0; i < ATA_MAX_SMART_ATTRS; i++) {
|
|
|
++ u8 *attr = buf + i * 12;
|
|
|
++ int id = attr[2];
|
|
|
++
|
|
|
++ if (!id)
|
|
|
++ continue;
|
|
|
++
|
|
|
++ if (id == SMART_TEMP_PROP_190) {
|
|
|
++ temp_raw = attr[7];
|
|
|
++ have_temp = true;
|
|
|
++ }
|
|
|
++ if (id == SMART_TEMP_PROP_194) {
|
|
|
++ temp_raw = attr[7];
|
|
|
++ have_temp = true;
|
|
|
++ break;
|
|
|
++ }
|
|
|
++ }
|
|
|
++
|
|
|
++ if (have_temp) {
|
|
|
++ *temp = temp_raw * 1000;
|
|
|
++ return 0;
|
|
|
++ }
|
|
|
++
|
|
|
++ return -ENXIO;
|
|
|
++}
|
|
|
++
|
|
|
++static int drivetemp_get_scttemp(struct drivetemp_data *st, u32 attr, long *val)
|
|
|
++{
|
|
|
++ u8 *buf = st->smartdata;
|
|
|
++ int err;
|
|
|
++
|
|
|
++ err = drivetemp_ata_command(st, SMART_READ_LOG, SCT_STATUS_REQ_ADDR);
|
|
|
++ if (err)
|
|
|
++ return err;
|
|
|
++ switch (attr) {
|
|
|
++ case hwmon_temp_input:
|
|
|
++ *val = temp_from_sct(buf[SCT_STATUS_TEMP]);
|
|
|
++ break;
|
|
|
++ case hwmon_temp_lowest:
|
|
|
++ *val = temp_from_sct(buf[SCT_STATUS_TEMP_LOWEST]);
|
|
|
++ break;
|
|
|
++ case hwmon_temp_highest:
|
|
|
++ *val = temp_from_sct(buf[SCT_STATUS_TEMP_HIGHEST]);
|
|
|
++ break;
|
|
|
++ default:
|
|
|
++ err = -EINVAL;
|
|
|
++ break;
|
|
|
++ }
|
|
|
++ return err;
|
|
|
++}
|
|
|
++
|
|
|
++static int drivetemp_identify_sata(struct drivetemp_data *st)
|
|
|
++{
|
|
|
++ struct scsi_device *sdev = st->sdev;
|
|
|
++ u8 *buf = st->smartdata;
|
|
|
++ struct scsi_vpd *vpd;
|
|
|
++ bool is_ata, is_sata;
|
|
|
++ bool have_sct_data_table;
|
|
|
++ bool have_sct_temp;
|
|
|
++ bool have_smart;
|
|
|
++ bool have_sct;
|
|
|
++ u16 *ata_id;
|
|
|
++ u16 version;
|
|
|
++ long temp;
|
|
|
++ int err;
|
|
|
++
|
|
|
++ /* SCSI-ATA Translation present? */
|
|
|
++ rcu_read_lock();
|
|
|
++ vpd = rcu_dereference(sdev->vpd_pg89);
|
|
|
++
|
|
|
++ /*
|
|
|
++ * Verify that ATA IDENTIFY DEVICE data is included in ATA Information
|
|
|
++ * VPD and that the drive implements the SATA protocol.
|
|
|
++ */
|
|
|
++ if (!vpd || vpd->len < 572 || vpd->data[56] != ATA_CMD_ID_ATA ||
|
|
|
++ vpd->data[36] != 0x34) {
|
|
|
++ rcu_read_unlock();
|
|
|
++ return -ENODEV;
|
|
|
++ }
|
|
|
++ ata_id = (u16 *)&vpd->data[60];
|
|
|
++ is_ata = ata_id_is_ata(ata_id);
|
|
|
++ is_sata = ata_id_is_sata(ata_id);
|
|
|
++ have_sct = ata_id_sct_supported(ata_id);
|
|
|
++ have_sct_data_table = ata_id_sct_data_tables(ata_id);
|
|
|
++ have_smart = ata_id_smart_supported(ata_id) &&
|
|
|
++ ata_id_smart_enabled(ata_id);
|
|
|
++
|
|
|
++ rcu_read_unlock();
|
|
|
++
|
|
|
++ /* bail out if this is not a SATA device */
|
|
|
++ if (!is_ata || !is_sata)
|
|
|
++ return -ENODEV;
|
|
|
++ if (!have_sct)
|
|
|
++ goto skip_sct;
|
|
|
++
|
|
|
++ err = drivetemp_ata_command(st, SMART_READ_LOG, SCT_STATUS_REQ_ADDR);
|
|
|
++ if (err)
|
|
|
++ goto skip_sct;
|
|
|
++
|
|
|
++ version = (buf[SCT_STATUS_VERSION_HIGH] << 8) |
|
|
|
++ buf[SCT_STATUS_VERSION_LOW];
|
|
|
++ if (version != 2 && version != 3)
|
|
|
++ goto skip_sct;
|
|
|
++
|
|
|
++ have_sct_temp = temp_is_valid(buf[SCT_STATUS_TEMP]);
|
|
|
++ if (!have_sct_temp)
|
|
|
++ goto skip_sct;
|
|
|
++
|
|
|
++ st->have_temp_lowest = temp_is_valid(buf[SCT_STATUS_TEMP_LOWEST]);
|
|
|
++ st->have_temp_highest = temp_is_valid(buf[SCT_STATUS_TEMP_HIGHEST]);
|
|
|
++
|
|
|
++ if (!have_sct_data_table)
|
|
|
++ goto skip_sct;
|
|
|
++
|
|
|
++ /* Request and read temperature history table */
|
|
|
++ memset(buf, '\0', sizeof(st->smartdata));
|
|
|
++ buf[0] = 5; /* data table command */
|
|
|
++ buf[2] = 1; /* read table */
|
|
|
++ buf[4] = 2; /* temperature history table */
|
|
|
++
|
|
|
++ err = drivetemp_ata_command(st, SMART_WRITE_LOG, SCT_STATUS_REQ_ADDR);
|
|
|
++ if (err)
|
|
|
++ goto skip_sct_data;
|
|
|
++
|
|
|
++ err = drivetemp_ata_command(st, SMART_READ_LOG, SCT_READ_LOG_ADDR);
|
|
|
++ if (err)
|
|
|
++ goto skip_sct_data;
|
|
|
++
|
|
|
++ /*
|
|
|
++ * Temperature limits per AT Attachment 8 -
|
|
|
++ * ATA/ATAPI Command Set (ATA8-ACS)
|
|
|
++ */
|
|
|
++ st->have_temp_max = temp_is_valid(buf[6]);
|
|
|
++ st->have_temp_crit = temp_is_valid(buf[7]);
|
|
|
++ st->have_temp_min = temp_is_valid(buf[8]);
|
|
|
++ st->have_temp_lcrit = temp_is_valid(buf[9]);
|
|
|
++
|
|
|
++ st->temp_max = temp_from_sct(buf[6]);
|
|
|
++ st->temp_crit = temp_from_sct(buf[7]);
|
|
|
++ st->temp_min = temp_from_sct(buf[8]);
|
|
|
++ st->temp_lcrit = temp_from_sct(buf[9]);
|
|
|
++
|
|
|
++skip_sct_data:
|
|
|
++ if (have_sct_temp) {
|
|
|
++ st->get_temp = drivetemp_get_scttemp;
|
|
|
++ return 0;
|
|
|
++ }
|
|
|
++skip_sct:
|
|
|
++ if (!have_smart)
|
|
|
++ return -ENODEV;
|
|
|
++ st->get_temp = drivetemp_get_smarttemp;
|
|
|
++ return drivetemp_get_smarttemp(st, hwmon_temp_input, &temp);
|
|
|
++}
|
|
|
++
|
|
|
++static int drivetemp_identify(struct drivetemp_data *st)
|
|
|
++{
|
|
|
++ struct scsi_device *sdev = st->sdev;
|
|
|
++
|
|
|
++ /* Bail out immediately if there is no inquiry data */
|
|
|
++ if (!sdev->inquiry || sdev->inquiry_len < 16)
|
|
|
++ return -ENODEV;
|
|
|
++
|
|
|
++ /* Disk device? */
|
|
|
++ if (sdev->type != TYPE_DISK && sdev->type != TYPE_ZBC)
|
|
|
++ return -ENODEV;
|
|
|
++
|
|
|
++ return drivetemp_identify_sata(st);
|
|
|
++}
|
|
|
++
|
|
|
++static int drivetemp_read(struct device *dev, enum hwmon_sensor_types type,
|
|
|
++ u32 attr, int channel, long *val)
|
|
|
++{
|
|
|
++ struct drivetemp_data *st = dev_get_drvdata(dev);
|
|
|
++ int err = 0;
|
|
|
++
|
|
|
++ if (type != hwmon_temp)
|
|
|
++ return -EINVAL;
|
|
|
++
|
|
|
++ switch (attr) {
|
|
|
++ case hwmon_temp_input:
|
|
|
++ case hwmon_temp_lowest:
|
|
|
++ case hwmon_temp_highest:
|
|
|
++ mutex_lock(&st->lock);
|
|
|
++ err = st->get_temp(st, attr, val);
|
|
|
++ mutex_unlock(&st->lock);
|
|
|
++ break;
|
|
|
++ case hwmon_temp_lcrit:
|
|
|
++ *val = st->temp_lcrit;
|
|
|
++ break;
|
|
|
++ case hwmon_temp_min:
|
|
|
++ *val = st->temp_min;
|
|
|
++ break;
|
|
|
++ case hwmon_temp_max:
|
|
|
++ *val = st->temp_max;
|
|
|
++ break;
|
|
|
++ case hwmon_temp_crit:
|
|
|
++ *val = st->temp_crit;
|
|
|
++ break;
|
|
|
++ default:
|
|
|
++ err = -EINVAL;
|
|
|
++ break;
|
|
|
++ }
|
|
|
++ return err;
|
|
|
++}
|
|
|
++
|
|
|
++static umode_t drivetemp_is_visible(const void *data,
|
|
|
++ enum hwmon_sensor_types type,
|
|
|
++ u32 attr, int channel)
|
|
|
++{
|
|
|
++ const struct drivetemp_data *st = data;
|
|
|
++
|
|
|
++ switch (type) {
|
|
|
++ case hwmon_temp:
|
|
|
++ switch (attr) {
|
|
|
++ case hwmon_temp_input:
|
|
|
++ return 0444;
|
|
|
++ case hwmon_temp_lowest:
|
|
|
++ if (st->have_temp_lowest)
|
|
|
++ return 0444;
|
|
|
++ break;
|
|
|
++ case hwmon_temp_highest:
|
|
|
++ if (st->have_temp_highest)
|
|
|
++ return 0444;
|
|
|
++ break;
|
|
|
++ case hwmon_temp_min:
|
|
|
++ if (st->have_temp_min)
|
|
|
++ return 0444;
|
|
|
++ break;
|
|
|
++ case hwmon_temp_max:
|
|
|
++ if (st->have_temp_max)
|
|
|
++ return 0444;
|
|
|
++ break;
|
|
|
++ case hwmon_temp_lcrit:
|
|
|
++ if (st->have_temp_lcrit)
|
|
|
++ return 0444;
|
|
|
++ break;
|
|
|
++ case hwmon_temp_crit:
|
|
|
++ if (st->have_temp_crit)
|
|
|
++ return 0444;
|
|
|
++ break;
|
|
|
++ default:
|
|
|
++ break;
|
|
|
++ }
|
|
|
++ break;
|
|
|
++ default:
|
|
|
++ break;
|
|
|
++ }
|
|
|
++ return 0;
|
|
|
++}
|
|
|
++
|
|
|
++static const struct hwmon_channel_info *drivetemp_info[] = {
|
|
|
++ HWMON_CHANNEL_INFO(chip,
|
|
|
++ HWMON_C_REGISTER_TZ),
|
|
|
++ HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT |
|
|
|
++ HWMON_T_LOWEST | HWMON_T_HIGHEST |
|
|
|
++ HWMON_T_MIN | HWMON_T_MAX |
|
|
|
++ HWMON_T_LCRIT | HWMON_T_CRIT),
|
|
|
++ NULL
|
|
|
++};
|
|
|
++
|
|
|
++static const struct hwmon_ops drivetemp_ops = {
|
|
|
++ .is_visible = drivetemp_is_visible,
|
|
|
++ .read = drivetemp_read,
|
|
|
++};
|
|
|
++
|
|
|
++static const struct hwmon_chip_info drivetemp_chip_info = {
|
|
|
++ .ops = &drivetemp_ops,
|
|
|
++ .info = drivetemp_info,
|
|
|
++};
|
|
|
++
|
|
|
++/*
|
|
|
++ * The device argument points to sdev->sdev_dev. Its parent is
|
|
|
++ * sdev->sdev_gendev, which we can use to get the scsi_device pointer.
|
|
|
++ */
|
|
|
++static int drivetemp_add(struct device *dev, struct class_interface *intf)
|
|
|
++{
|
|
|
++ struct scsi_device *sdev = to_scsi_device(dev->parent);
|
|
|
++ struct drivetemp_data *st;
|
|
|
++ int err;
|
|
|
++
|
|
|
++ st = kzalloc(sizeof(*st), GFP_KERNEL);
|
|
|
++ if (!st)
|
|
|
++ return -ENOMEM;
|
|
|
++
|
|
|
++ st->sdev = sdev;
|
|
|
++ st->dev = dev;
|
|
|
++ mutex_init(&st->lock);
|
|
|
++
|
|
|
++ if (drivetemp_identify(st)) {
|
|
|
++ err = -ENODEV;
|
|
|
++ goto abort;
|
|
|
++ }
|
|
|
++
|
|
|
++ st->hwdev = hwmon_device_register_with_info(dev->parent, "drivetemp",
|
|
|
++ st, &drivetemp_chip_info,
|
|
|
++ NULL);
|
|
|
++ if (IS_ERR(st->hwdev)) {
|
|
|
++ err = PTR_ERR(st->hwdev);
|
|
|
++ goto abort;
|
|
|
++ }
|
|
|
++
|
|
|
++ list_add(&st->list, &drivetemp_devlist);
|
|
|
++ return 0;
|
|
|
++
|
|
|
++abort:
|
|
|
++ kfree(st);
|
|
|
++ return err;
|
|
|
++}
|
|
|
++
|
|
|
++static void drivetemp_remove(struct device *dev, struct class_interface *intf)
|
|
|
++{
|
|
|
++ struct drivetemp_data *st, *tmp;
|
|
|
++
|
|
|
++ list_for_each_entry_safe(st, tmp, &drivetemp_devlist, list) {
|
|
|
++ if (st->dev == dev) {
|
|
|
++ list_del(&st->list);
|
|
|
++ hwmon_device_unregister(st->hwdev);
|
|
|
++ kfree(st);
|
|
|
++ break;
|
|
|
++ }
|
|
|
++ }
|
|
|
++}
|
|
|
++
|
|
|
++static struct class_interface drivetemp_interface = {
|
|
|
++ .add_dev = drivetemp_add,
|
|
|
++ .remove_dev = drivetemp_remove,
|
|
|
++};
|
|
|
++
|
|
|
++static int __init drivetemp_init(void)
|
|
|
++{
|
|
|
++ return scsi_register_interface(&drivetemp_interface);
|
|
|
++}
|
|
|
++
|
|
|
++static void __exit drivetemp_exit(void)
|
|
|
++{
|
|
|
++ scsi_unregister_interface(&drivetemp_interface);
|
|
|
++}
|
|
|
++
|
|
|
++module_init(drivetemp_init);
|
|
|
++module_exit(drivetemp_exit);
|
|
|
++
|
|
|
++MODULE_AUTHOR("Guenter Roeck <[email protected]>");
|
|
|
++MODULE_DESCRIPTION("Hard drive temperature monitor");
|
|
|
++MODULE_LICENSE("GPL");
|
Christian Lamparter