Merge tag 'hwmon-for-v5.5' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging

Pull hwmon updates from Guenter Roeck:

 - Add support for Texas Instruments TMP512/513

 - Add support for LTC2947

 - Add support for BEL PFE1100 and PFE3000

 - Various minor improvements and fixes

* tag 'hwmon-for-v5.5' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging:
  dell-smm-hwmon: Add documentation
  hwmon: (dell-smm) Add support for disabling automatic BIOS fan control
  hwmon: Add driver for Texas Instruments TMP512/513 sensor chips.
  dt-bindings: hwmon: Add TMP512/513
  docs: hwmon: Document bel-pfe pmbus driver
  hwmon: (pmbus) add driver for BEL PFE1100 and PFE3000
  dt-bindings: hwmon: Add ltc2947 documentation
  hwmon: Add support for ltc2947
  hwmon: (ina3221) Add summation feature support
  hwmon: (tmp421) Allow reading at 2Hz instead of 0.5Hz
  hwmon: (w83793d) remove redundant assignment to variable res
  hwmon: (pmbus/ibm-cffps) Add version detection capability
  dt-bindings: hwmon: Document ibm,cffps compatible string
  hwmon: abituguru: make array probe_order static, makes object smaller
  hwmon: (applesmc) switch to using input device polling mode
  hwmon: (aspeed-pwm-tacho) Use devm_platform_ioremap_resource() in aspeed_pwm_tacho_probe()
  hwmon: (pmbus/ibm-cffps) Fix LED blink behavior
  hwmon: (pmbus/ibm-cffps) Switch LEDs to blocking brightness call

Documentation/devicetree/bindings/hwmon/adi,ltc2947.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/bindings/hwmon/adi,ltc2947.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices LTC2947 high precision power and energy monitor
+
+maintainers:
+  - Nuno Sá <nuno.sa@analog.com>
+
+description: |
+  Analog Devices LTC2947 high precision power and energy monitor over SPI or I2C.
+
+  https://www.analog.com/media/en/technical-documentation/data-sheets/LTC2947.pdf
+
+properties:
+  compatible:
+    enum:
+      - adi,ltc2947
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    description:
+      The LTC2947 uses either a trimmed internal oscillator or an external clock
+      as the time base for determining the integration period to represent time,
+      charge and energy. When an external clock is used, this property must be
+      set accordingly.
+    maxItems: 1
+
+  adi,accumulator-ctl-pol:
+    description:
+      This property controls the polarity of current that is accumulated to
+      calculate charge and energy so that, they can be only accumulated for
+      positive current for example. Since there are two sets of registers for
+      the accumulated values, this entry can also have two items which sets
+      energy1/charge1 and energy2/charger2 respectively. Check table 12 of the
+      datasheet for more information on the supported options.
+    allOf:
+      - $ref: /schemas/types.yaml#/definitions/uint32-array
+      - minItems: 2
+        maxItems: 2
+        items:
+          enum: [0, 1, 2, 3]
+          default: 0
+
+  adi,accumulation-deadband-microamp:
+    description:
+      This property controls the Accumulation Dead band which allows to set the
+      level of current below which no accumulation takes place.
+    allOf:
+      - $ref: /schemas/types.yaml#/definitions/uint32
+    maximum: 255
+    default: 0
+
+  adi,gpio-out-pol:
+    description:
+      This property controls the GPIO polarity. Setting it to one makes the GPIO
+      active high, setting it to zero makets it active low. When this property
+      is present, the GPIO is automatically configured as output and set to
+      control a fan as a function of measured temperature.
+    allOf:
+      - $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [0, 1]
+    default: 0
+
+  adi,gpio-in-accum:
+    description:
+      When set, this property sets the GPIO as input. It is then used to control
+      the accumulation of charge, energy and time. This function can be
+      enabled/configured separately for each of the two sets of accumulation
+      registers. Check table 13 of the datasheet for more information on the
+      supported options. This property cannot be used together with
+      adi,gpio-out-pol.
+    allOf:
+      - $ref: /schemas/types.yaml#/definitions/uint32-array
+      - minItems: 2
+        maxItems: 2
+        items:
+          enum: [0, 1, 2]
+          default: 0
+
+required:
+  - compatible
+  - reg
+
+
+examples:
+  - |
+    spi {
+           #address-cells = <1>;
+           #size-cells = <0>;
+
+           ltc2947_spi: ltc2947@0 {
+                   compatible = "adi,ltc2947";
+                   reg = <0>;
+                   /* accumulation takes place always for energ1/charge1. */
+                   /* accumulation only on positive current for energy2/charge2. */
+                   adi,accumulator-ctl-pol = <0 1>;
+           };
+    };
+...

Documentation/devicetree/bindings/hwmon/ibm,cffps1.txt

@@ -5,6 +5,9 @@ Required properties:
  - compatible				: Must be one of the following:
 						"ibm,cffps1"
 						"ibm,cffps2"
+						or "ibm,cffps" if the system
+						must support any version of the
+						power supply
  - reg = < I2C bus address >;		: Address of the power supply on the
 					  I2C bus.
 

Documentation/devicetree/bindings/hwmon/ti,tmp513.yaml

+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+
+$id: http://devicetree.org/schemas/hwmon/ti,tmp513.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: TMP513/512 system monitor sensor
+
+maintainers:
+  - Eric Tremblay <etremblay@distech-controls.com>
+
+description: |
+  The TMP512 (dual-channel) and TMP513 (triple-channel) are system monitors
+  that include remote sensors, a local temperature sensor, and a high-side
+  current shunt monitor. These system monitors have the capability of measuring
+  remote temperatures, on-chip temperatures, and system voltage/power/current
+  consumption.
+
+  Datasheets:
+  http://www.ti.com/lit/gpn/tmp513
+  http://www.ti.com/lit/gpn/tmp512
+
+
+properties:
+  compatible:
+    enum:
+      - ti,tmp512
+      - ti,tmp513
+
+  reg:
+    maxItems: 1
+
+  shunt-resistor-micro-ohms:
+    description: |
+      If 0, the calibration process will be skiped and the current and power
+      measurement engine will not work. Temperature and voltage measurement
+      will continue to work. The shunt value also need to respect:
+      rshunt <= pga-gain * 40 * 1000 * 1000.
+      If not, it's not possible to compute a valid calibration value.
+    default: 1000
+
+  ti,pga-gain:
+    description: |
+      The gain value for the PGA function. This is 8, 4, 2 or 1.
+      The PGA gain affect the shunt voltage range.
+      The range will be equal to: pga-gain * 40mV
+    allOf:
+      - $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [1, 2, 4, 8]
+    default: 8
+
+  ti,bus-range-microvolt:
+    description: |
+      This is the operating range of the bus voltage in microvolt
+    allOf:
+      - $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [16000000, 32000000]
+    default: 32000000
+
+  ti,nfactor:
+    description: |
+      Array of three(TMP513) or two(TMP512) n-Factor value for each remote
+      temperature channel.
+      See datasheet Table 11 for n-Factor range list and value interpretation.
+    allOf:
+      - $ref: /schemas/types.yaml#definitions/uint32-array
+      - minItems: 2
+        maxItems: 3
+        items:
+          default: 0x00
+          minimum: 0x00
+          maximum: 0xFF
+
+required:
+  - compatible
+  - reg
+
+examples:
+  - |
+    i2c {
+          #address-cells = <1>;
+          #size-cells = <0>;
+
+          tmp513@5c {
+              compatible = "ti,tmp513";
+              reg = <0x5C>;
+              shunt-resistor-micro-ohms = <330000>;
+              ti,bus-range-microvolt = <32000000>;
+              ti,pga-gain = <8>;
+              ti,nfactor = <0x1 0xF3 0x00>;
+          };
+    };

Documentation/hwmon/bel-pfe.rst

+Kernel driver bel-pfe
+======================
+
+Supported chips:
+
+  * BEL PFE1100
+
+    Prefixes: 'pfe1100'
+
+    Addresses scanned: -
+
+    Datasheet: https://www.belfuse.com/resources/datasheets/powersolutions/ds-bps-pfe1100-12-054xa.pdf
+
+  * BEL PFE3000
+
+    Prefixes: 'pfe3000'
+
+    Addresses scanned: -
+
+    Datasheet: https://www.belfuse.com/resources/datasheets/powersolutions/ds-bps-pfe3000-series.pdf
+
+Author: Tao Ren <rentao.bupt@gmail.com>
+
+
+Description
+-----------
+
+This driver supports hardware monitoring for below power supply devices
+which support PMBus Protocol:
+
+  * BEL PFE1100
+
+    1100 Watt AC to DC power-factor-corrected (PFC) power supply.
+    PMBus Communication Manual is not publicly available.
+
+  * BEL PFE3000
+
+    3000 Watt AC/DC power-factor-corrected (PFC) and DC-DC power supply.
+    PMBus Communication Manual is not publicly available.
+
+The driver is a client driver to the core PMBus driver. Please see
+Documentation/hwmon/pmbus.rst for details on PMBus client drivers.
+
+
+Usage Notes
+-----------
+
+This driver does not auto-detect devices. You will have to instantiate the
+devices explicitly. Please see Documentation/i2c/instantiating-devices.rst for
+details.
+
+Example: the following will load the driver for an PFE3000 at address 0x20
+on I2C bus #1::
+
+	$ modprobe bel-pfe
+	$ echo pfe3000 0x20 > /sys/bus/i2c/devices/i2c-1/new_device
+
+
+Platform data support
+---------------------
+
+The driver supports standard PMBus driver platform data.
+
+
+Sysfs entries
+-------------
+
+======================= =======================================================
+curr1_label		"iin"
+curr1_input		Measured input current
+curr1_max               Input current max value
+curr1_max_alarm         Input current max alarm
+
+curr[2-3]_label		"iout[1-2]"
+curr[2-3]_input		Measured output current
+curr[2-3]_max           Output current max value
+curr[2-3]_max_alarm     Output current max alarm
+
+fan[1-2]_input          Fan 1 and 2 speed in RPM
+fan1_target             Set fan speed reference for both fans
+
+in1_label		"vin"
+in1_input		Measured input voltage
+in1_crit		Input voltage critical max value
+in1_crit_alarm		Input voltage critical max alarm
+in1_lcrit               Input voltage critical min value
+in1_lcrit_alarm         Input voltage critical min alarm
+in1_max                 Input voltage max value
+in1_max_alarm           Input voltage max alarm
+
+in2_label               "vcap"
+in2_input               Hold up capacitor voltage
+
+in[3-8]_label		"vout[1-3,5-7]"
+in[3-8]_input		Measured output voltage
+in[3-4]_alarm           vout[1-2] output voltage alarm
+
+power[1-2]_label	"pin[1-2]"
+power[1-2]_input        Measured input power
+power[1-2]_alarm	Input power high alarm
+
+power[3-4]_label	"pout[1-2]"
+power[3-4]_input	Measured output power
+
+temp[1-3]_input		Measured temperature
+temp[1-3]_alarm         Temperature alarm
+======================= =======================================================
+
+.. note::
+
+    - curr3, fan2, vout[2-7], vcap, pin2, pout2 and temp3 attributes only
+      exist for PFE3000.

Documentation/hwmon/dell-smm-hwmon.rst

+.. SPDX-License-Identifier: GPL-2.0-or-later
+
+.. include:: <isonum.txt>
+
+Kernel driver dell-smm-hwmon
+============================
+
+:Copyright: |copy| 2002-2005 Massimo Dal Zotto <dz@debian.org>
+:Copyright: |copy| 2019 Giovanni Mascellani <gio@debian.org>
+
+Description
+-----------
+
+On many Dell laptops the System Management Mode (SMM) BIOS can be
+queried for the status of fans and temperature sensors.  Userspace
+utilities like ``sensors`` can be used to return the readings. The
+userspace suite `i8kutils`__ can also be used to read the sensors and
+automatically adjust fan speed (please notice that it currently uses
+the deprecated ``/proc/i8k`` interface).
+
+ __ https://github.com/vitorafsr/i8kutils
+
+``sysfs`` interface
+-------------------
+
+Temperature sensors and fans can be queried and set via the standard
+``hwmon`` interface on ``sysfs``, under the directory
+``/sys/class/hwmon/hwmonX`` for some value of ``X`` (search for the
+``X`` such that ``/sys/class/hwmon/hwmonX/name`` has content
+``dell_smm``). A number of other attributes can be read or written:
+
+=============================== ======= =======================================
+Name				Perm	Description
+=============================== ======= =======================================
+fan[1-3]_input                  RO      Fan speed in RPM.
+fan[1-3]_label                  RO      Fan label.
+pwm[1-3]                        RW      Control the fan PWM duty-cycle.
+pwm1_enable                     WO      Enable or disable automatic BIOS fan
+                                        control (not supported on all laptops,
+                                        see below for details).
+temp[1-10]_input                RO      Temperature reading in milli-degrees
+                                        Celsius.
+temp[1-10]_label                RO      Temperature sensor label.
+=============================== ======= =======================================
+
+Disabling automatic BIOS fan control
+------------------------------------
+
+On some laptops the BIOS automatically sets fan speed every few
+seconds. Therefore the fan speed set by mean of this driver is quickly
+overwritten.
+
+There is experimental support for disabling automatic BIOS fan
+control, at least on laptops where the corresponding SMM command is
+known, by writing the value ``1`` in the attribute ``pwm1_enable``
+(writing ``2`` enables automatic BIOS control again). Even if you have
+more than one fan, all of them are set to either enabled or disabled
+automatic fan control at the same time and, notwithstanding the name,
+``pwm1_enable`` sets automatic control for all fans.
+
+If ``pwm1_enable`` is not available, then it means that SMM codes for
+enabling and disabling automatic BIOS fan control are not whitelisted
+for your hardware. It is possible that codes that work for other
+laptops actually work for yours as well, or that you have to discover
+new codes.
+
+Check the list ``i8k_whitelist_fan_control`` in file
+``drivers/hwmon/dell-smm-hwmon.c`` in the kernel tree: as a first
+attempt you can try to add your machine and use an already-known code
+pair. If, after recompiling the kernel, you see that ``pwm1_enable``
+is present and works (i.e., you can manually control the fan speed),
+then please submit your finding as a kernel patch, so that other users
+can benefit from it. Please see
+:ref:`Documentation/process/submitting-patches.rst <submittingpatches>`
+for information on submitting patches.
+
+If no known code works on your machine, you need to resort to do some
+probing, because unfortunately Dell does not publish datasheets for
+its SMM. You can experiment with the code in `this repository`__ to
+probe the BIOS on your machine and discover the appropriate codes.
+
+ __ https://github.com/clopez/dellfan/
+
+Again, when you find new codes, we'd be happy to have your patches!
+
+Module parameters
+-----------------
+
+* force:bool
+                   Force loading without checking for supported
+                   models. (default: 0)
+
+* ignore_dmi:bool
+                   Continue probing hardware even if DMI data does not
+                   match. (default: 0)
+
+* restricted:bool
+                   Allow fan control only to processes with the
+                   ``CAP_SYS_ADMIN`` capability set or processes run
+                   as root when using the legacy ``/proc/i8k``
+                   interface. In this case normal users will be able
+                   to read temperature and fan status but not to
+                   control the fan.  If your notebook is shared with
+                   other users and you don't trust them you may want
+                   to use this option. (default: 1, only available
+                   with ``CONFIG_I8K``)
+
+* power_status:bool
+                   Report AC status in ``/proc/i8k``. (default: 0,
+                   only available with ``CONFIG_I8K``)
+
+* fan_mult:uint
+                   Factor to multiply fan speed with. (default:
+                   autodetect)
+
+* fan_max:uint
+                   Maximum configurable fan speed. (default:
+                   autodetect)
+
+Legacy ``/proc`` interface
+--------------------------
+
+.. warning:: This interface is obsolete and deprecated and should not
+             used in new applications. This interface is only
+             available when kernel is compiled with option
+             ``CONFIG_I8K``.
+
+The information provided by the kernel driver can be accessed by
+simply reading the ``/proc/i8k`` file. For example::
+
+    $ cat /proc/i8k
+    1.0 A17 2J59L02 52 2 1 8040 6420 1 2
+
+The fields read from ``/proc/i8k`` are::
+
+    1.0 A17 2J59L02 52 2 1 8040 6420 1 2
+    |   |   |       |  | | |    |    | |
+    |   |   |       |  | | |    |    | +------- 10. buttons status
+    |   |   |       |  | | |    |    +--------- 9.  AC status
+    |   |   |       |  | | |    +-------------- 8.  fan0 RPM
+    |   |   |       |  | | +------------------- 7.  fan1 RPM
+    |   |   |       |  | +--------------------- 6.  fan0 status
+    |   |   |       |  +----------------------- 5.  fan1 status
+    |   |   |       +-------------------------- 4.  temp0 reading (Celsius)
+    |   |   +---------------------------------- 3.  Dell service tag (later known as 'serial number')
+    |   +-------------------------------------- 2.  BIOS version
+    +------------------------------------------ 1.  /proc/i8k format version
+
+A negative value, for example -22, indicates that the BIOS doesn't
+return the corresponding information. This is normal on some
+models/BIOSes.
+
+For performance reasons the ``/proc/i8k`` doesn't report by default
+the AC status since this SMM call takes a long time to execute and is
+not really needed.  If you want to see the ac status in ``/proc/i8k``
+you must explictitly enable this option by passing the
+``power_status=1`` parameter to insmod. If AC status is not
+available -1 is printed instead.
+
+The driver provides also an ioctl interface which can be used to
+obtain the same information and to control the fan status. The ioctl
+interface can be accessed from C programs or from shell using the
+i8kctl utility. See the source file of ``i8kutils`` for more
+information on how to use the ioctl interface.

Documentation/hwmon/ina3221.rst

@@ -41,6 +41,18 @@ curr[123]_max           Warning alert current(mA) setting, activates the
 			average is above this value.
 curr[123]_max_alarm     Warning alert current limit exceeded
 in[456]_input           Shunt voltage(uV) for channels 1, 2, and 3 respectively
+in7_input               Sum of shunt voltage(uV) channels
+in7_label               Channel label for sum of shunt voltage
+curr4_input             Sum of current(mA) measurement channels,
+                        (only available when all channels use the same resistor
+                        value for their shunt resistors)
+curr4_crit              Critical alert current(mA) setting for sum of current
+                        measurements, activates the corresponding alarm
+                        when the respective current is above this value
+                        (only effective when all channels use the same resistor
+                        value for their shunt resistors)
+curr4_crit_alarm        Critical alert current limit exceeded for sum of
+                        current measurements.
 samples                 Number of samples using in the averaging mode.
 
                         Supports the list of number of samples:

Documentation/hwmon/index.rst

@@ -41,9 +41,11 @@ Hardware Monitoring Kernel Drivers
    asb100
    asc7621
    aspeed-pwm-tacho
+   bel-pfe
    coretemp
    da9052
    da9055
+   dell-smm-hwmon
    dme1737
    ds1621
    ds620
@@ -90,6 +92,7 @@ Hardware Monitoring Kernel Drivers
    lm95245
    lochnagar
    ltc2945
+   ltc2947
    ltc2978
    ltc2990
    ltc3815
@@ -153,6 +156,7 @@ Hardware Monitoring Kernel Drivers
    tmp108
    tmp401
    tmp421
+   tmp513
    tps40422
    twl4030-madc-hwmon
    ucd9000

Documentation/hwmon/ltc2947.rst

+Kernel drivers ltc2947-i2c and ltc2947-spi
+==========================================
+
+Supported chips:
+
+  * Analog Devices LTC2947
+
+    Prefix: 'ltc2947'
+
+    Addresses scanned: -
+
+    Datasheet:
+
+        https://www.analog.com/media/en/technical-documentation/data-sheets/LTC2947.pdf
+
+Author: Nuno Sá <nuno.sa@analog.com>
+
+Description
+___________
+
+The LTC2947 is a high precision power and energy monitor that measures current,
+voltage, power, temperature, charge and energy. The device supports both SPI
+and I2C depending on the chip configuration.
+The device also measures accumulated quantities as energy. It has two banks of
+register's to read/set energy related values. These banks can be configured
+independently to have setups like: energy1 accumulates always and enrgy2 only
+accumulates if current is positive (to check battery charging efficiency for
+example). The device also supports a GPIO pin that can be configured as output
+to control a fan as a function of measured temperature. Then, the GPIO becomes
+active as soon as a temperature reading is higher than a defined threshold. The
+temp2 channel is used to control this thresholds and to read the respective
+alarms.
+
+Sysfs entries
+_____________
+
+The following attributes are supported. Limits are read-write, reset_history
+is write-only and all the other attributes are read-only.
+
+======================= ==========================================
+in0_input		VP-VM voltage (mV).
+in0_min			Undervoltage threshold
+in0_max			Overvoltage threshold
+in0_lowest		Lowest measured voltage
+in0_highest		Highest measured voltage
+in0_reset_history	Write 1 to reset in1 history
+in0_min_alarm		Undervoltage alarm
+in0_max_alarm		Overvoltage alarm
+in0_label		Channel label (VP-VM)
+
+in1_input		DVCC voltage (mV)
+in1_min			Undervoltage threshold
+in1_max			Overvoltage threshold
+in1_lowest		Lowest measured voltage
+in1_highest		Highest measured voltage
+in1_reset_history	Write 1 to reset in2 history
+in1_min_alarm		Undervoltage alarm
+in1_max_alarm		Overvoltage alarm
+in1_label		Channel label (DVCC)
+
+curr1_input		IP-IM Sense current (mA)
+curr1_min		Undercurrent threshold
+curr1_max		Overcurrent threshold
+curr1_lowest		Lowest measured current
+curr1_highest		Highest measured current
+curr1_reset_history	Write 1 to reset curr1 history
+curr1_min_alarm		Undercurrent alarm
+curr1_max_alarm		Overcurrent alarm
+curr1_label		Channel label (IP-IM)
+
+power1_input		Power (in uW)
+power1_min		Low power threshold
+power1_max		High power threshold
+power1_input_lowest	Historical minimum power use
+power1_input_highest	Historical maximum power use
+power1_reset_history	Write 1 to reset power1 history
+power1_min_alarm	Low power alarm
+power1_max_alarm	High power alarm
+power1_label		Channel label (Power)
+
+temp1_input		Chip Temperature (in milliC)
+temp1_min		Low temperature threshold
+temp1_max		High temperature threshold
+temp1_input_lowest	Historical minimum temperature use
+temp1_input_highest	Historical maximum temperature use
+temp1_reset_history	Write 1 to reset temp1 history
+temp1_min_alarm		Low temperature alarm
+temp1_max_alarm		High temperature alarm
+temp1_label		Channel label (Ambient)
+
+temp2_min		Low temperature threshold for fan control
+temp2_max		High temperature threshold for fan control
+temp2_min_alarm		Low temperature fan control alarm
+temp2_max_alarm		High temperature fan control alarm
+temp2_label		Channel label (TEMPFAN)
+
+energy1_input		Measured energy over time (in microJoule)
+
+energy2_input		Measured energy over time (in microJoule)
+======================= ==========================================

Documentation/hwmon/tmp513.rst

+.. SPDX-License-Identifier: GPL-2.0
+
+Kernel driver tmp513
+====================
+
+Supported chips:
+
+  * Texas Instruments TMP512
+
+    Prefix: 'tmp512'
+
+    Datasheet: http://www.ti.com/lit/ds/symlink/tmp512.pdf
+
+  * Texas Instruments TMP513
+
+    Prefix: 'tmp513'
+
+    Datasheet: http://www.ti.com/lit/ds/symlink/tmp513.pdf
+
+Authors:
+
+	Eric Tremblay <etremblay@distech-controls.com>
+
+Description
+-----------
+
+This driver implements support for Texas Instruments TMP512, and TMP513.
+The TMP512 (dual-channel) and TMP513 (triple-channel) are system monitors
+that include remote sensors, a local temperature sensor, and a high-side current
+shunt monitor. These system monitors have the capability of measuring remote
+temperatures, on-chip temperatures, and system voltage/power/current
+consumption.
+
+The temperatures are measured in degrees Celsius with a range of
+-40 to + 125 degrees with a resolution of 0.0625 degree C.
+
+For hysteresis value, only the first channel is writable. Writing to it
+will affect all other values since each channels are sharing the same
+hysteresis value. The hysteresis is in degrees Celsius with a range of
+0 to 127.5 degrees with a resolution of 0.5 degree.
+
+The driver exports the temperature values via the following sysfs files:
+
+**temp[1-4]_input**
+
+**temp[1-4]_crit**
+
+**temp[1-4]_crit_alarm**
+
+**temp[1-4]_crit_hyst**
+
+The driver read the shunt voltage from the chip and convert it to current.
+The readable range depends on the "ti,pga-gain" property (default to 8) and the
+shunt resistor value. The value resolution will be equal to 10uV/Rshunt.
+
+The driver exports the shunt currents values via the following sysFs files:
+
+**curr1_input**
+
+**curr1_lcrit**
+
+**curr1_lcrit_alarm**
+
+**curr1_crit**
+
+**curr1_crit_alarm**
+
+The bus voltage range is read from the chip with a resolution of 4mV. The chip
+can be configurable in two different range (32V or 16V) using the
+ti,bus-range-microvolt property in the devicetree.
+
+The driver exports the bus voltage values via the following sysFs files:
+
+**in0_input**
+
+**in0_lcrit**
+
+**in0_lcrit_alarm**
+
+**in0_crit**
+
+**in0_crit_alarm**
+
+The bus power and bus currents range and resolution depends on the calibration
+register value. Those values are calculate by the hardware using those
+formulas:
+
+Current = (ShuntVoltage * CalibrationRegister) / 4096
+Power   = (Current * BusVoltage) / 5000
+
+The driver exports the bus current and bus power values via the following
+sysFs files:
+
+**curr2_input**
+
+**power1_input**
+
+**power1_crit**
+
+**power1_crit_alarm**
+
+The calibration process follow the procedure of the datasheet (without overflow)
+and depend on the shunt resistor value and the pga_gain value.

MAINTAINERS

@@ -9717,6 +9717,17 @@ S:	Maintained
 F:	Documentation/hwmon/ltc4261.rst
 F:	drivers/hwmon/ltc4261.c
 
+LTC2947 HARDWARE MONITOR DRIVER
+M:	Nuno Sá <nuno.sa@analog.com>
+W:	http://ez.analog.com/community/linux-device-drivers
+L:	linux-hwmon@vger.kernel.org
+S:	Supported
+F:	drivers/hwmon/ltc2947-core.c
+F:	drivers/hwmon/ltc2947-spi.c
+F:	drivers/hwmon/ltc2947-i2c.c
+F:	drivers/hwmon/ltc2947.h
+F:	Documentation/devicetree/bindings/hwmon/adi,ltc2947.yaml
+
 LTC4306 I2C MULTIPLEXER DRIVER
 M:	Michael Hennerich <michael.hennerich@analog.com>
 W:	http://ez.analog.com/community/linux-device-drivers
@@ -16493,6 +16504,13 @@ S:	Maintained
 F:	Documentation/hwmon/tmp401.rst
 F:	drivers/hwmon/tmp401.c
 
+TMP513 HARDWARE MONITOR DRIVER
+M:	Eric Tremblay <etremblay@distech-controls.com>
+L:	linux-hwmon@vger.kernel.org
+S:	Maintained
+F:	Documentation/hwmon/tmp513.rst
+F:	drivers/hwmon/tmp513.c
+
 TMPFS (SHMEM FILESYSTEM)
 M:	Hugh Dickins <hughd@google.com>
 L:	linux-mm@kvack.org

drivers/hwmon/Kconfig

@@ -310,7 +310,6 @@ config SENSORS_APPLESMC
 	depends on INPUT && X86
 	select NEW_LEDS
 	select LEDS_CLASS
-	select INPUT_POLLDEV
 	help
 	  This driver provides support for the Apple System Management
 	  Controller, which provides an accelerometer (Apple Sudden Motion
@@ -728,6 +727,33 @@ config SENSORS_LTC2945
 	  This driver can also be built as a module. If so, the module will
 	  be called ltc2945.
 
+config SENSORS_LTC2947
+	tristate
+
+config SENSORS_LTC2947_I2C
+	tristate "Analog Devices LTC2947 High Precision Power and Energy Monitor over I2C"
+	depends on I2C
+	select REGMAP_I2C
+	select SENSORS_LTC2947
+	help
+	  If you say yes here you get support for Linear Technology LTC2947
+	  I2C High Precision Power and Energy Monitor
+
+	  This driver can also be built as a module. If so, the module will
+	  be called ltc2947-i2c.
+
+config SENSORS_LTC2947_SPI
+	tristate "Analog Devices LTC2947 High Precision Power and Energy Monitor over SPI"
+	depends on SPI_MASTER
+	select REGMAP_SPI
+	select SENSORS_LTC2947
+	help
+	  If you say yes here you get support for Linear Technology LTC2947
+	  SPI High Precision Power and Energy Monitor
+
+	  This driver can also be built as a module. If so, the module will
+	  be called ltc2947-spi.
+
 config SENSORS_LTC2990
 	tristate "Linear Technology LTC2990"
 	depends on I2C
@@ -1710,6 +1736,16 @@ config SENSORS_TMP421
 	  This driver can also be built as a module. If so, the module
 	  will be called tmp421.
 
+config SENSORS_TMP513
+	tristate "Texas Instruments TMP513 and compatibles"
+	depends on I2C
+	help
+	  If you say yes here you get support for Texas Instruments TMP512,
+	  and TMP513 temperature and power supply sensor chips.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called tmp513.
+
 config SENSORS_VEXPRESS
 	tristate "Versatile Express"
 	depends on VEXPRESS_CONFIG

drivers/hwmon/Makefile

@@ -106,6 +106,9 @@ obj-$(CONFIG_SENSORS_LM95234)	+= lm95234.o
 obj-$(CONFIG_SENSORS_LM95241)	+= lm95241.o
 obj-$(CONFIG_SENSORS_LM95245)	+= lm95245.o
 obj-$(CONFIG_SENSORS_LTC2945)	+= ltc2945.o
+obj-$(CONFIG_SENSORS_LTC2947)	+= ltc2947-core.o
+obj-$(CONFIG_SENSORS_LTC2947_I2C) += ltc2947-i2c.o
+obj-$(CONFIG_SENSORS_LTC2947_SPI) += ltc2947-spi.o
 obj-$(CONFIG_SENSORS_LTC2990)	+= ltc2990.o
 obj-$(CONFIG_SENSORS_LTC4151)	+= ltc4151.o
 obj-$(CONFIG_SENSORS_LTC4215)	+= ltc4215.o
@@ -166,6 +169,7 @@ obj-$(CONFIG_SENSORS_TMP103)	+= tmp103.o
 obj-$(CONFIG_SENSORS_TMP108)	+= tmp108.o
 obj-$(CONFIG_SENSORS_TMP401)	+= tmp401.o
 obj-$(CONFIG_SENSORS_TMP421)	+= tmp421.o
+obj-$(CONFIG_SENSORS_TMP513)	+= tmp513.o
 obj-$(CONFIG_SENSORS_VEXPRESS)	+= vexpress-hwmon.o
 obj-$(CONFIG_SENSORS_VIA_CPUTEMP)+= via-cputemp.o
 obj-$(CONFIG_SENSORS_VIA686A)	+= via686a.o

drivers/hwmon/abituguru.c

@@ -1264,7 +1264,7 @@ static int abituguru_probe(struct platform_device *pdev)
 	 * El weirdo probe order, to keep the sysfs order identical to the
 	 * BIOS and window-appliction listing order.
 	 */
-	const u8 probe_order[ABIT_UGURU_MAX_BANK1_SENSORS] = {
+	static const u8 probe_order[ABIT_UGURU_MAX_BANK1_SENSORS] = {
 		0x00, 0x01, 0x03, 0x04, 0x0A, 0x08, 0x0E, 0x02,
 		0x09, 0x06, 0x05, 0x0B, 0x0F, 0x0D, 0x07, 0x0C };
 

drivers/hwmon/applesmc.c

@@ -19,7 +19,7 @@
 
 #include <linux/delay.h>
 #include <linux/platform_device.h>
-#include <linux/input-polldev.h>
+#include <linux/input.h>
 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/module.h>
@@ -140,7 +140,7 @@ static s16 rest_y;
 static u8 backlight_state[2];
 
 static struct device *hwmon_dev;
-static struct input_polled_dev *applesmc_idev;
+static struct input_dev *applesmc_idev;
 
 /*
  * Last index written to key_at_index sysfs file, and value to use for all other
@@ -681,9 +681,8 @@ static void applesmc_calibrate(void)
 	rest_x = -rest_x;
 }
 
-static void applesmc_idev_poll(struct input_polled_dev *dev)
+static void applesmc_idev_poll(struct input_dev *idev)
 {
-	struct input_dev *idev = dev->input;
 	s16 x, y;
 
 	if (applesmc_read_s16(MOTION_SENSOR_X_KEY, &x))
@@ -1134,7 +1133,6 @@ static int applesmc_create_nodes(struct applesmc_node_group *groups, int num)
 /* Create accelerometer resources */
 static int applesmc_create_accelerometer(void)
 {
-	struct input_dev *idev;
 	int ret;
 
 	if (!smcreg.has_accelerometer)
@@ -1144,37 +1142,38 @@ static int applesmc_create_accelerometer(void)
 	if (ret)
 		goto out;
 
-	applesmc_idev = input_allocate_polled_device();
+	applesmc_idev = input_allocate_device();
 	if (!applesmc_idev) {
 		ret = -ENOMEM;
 		goto out_sysfs;
 	}
 
-	applesmc_idev->poll = applesmc_idev_poll;
-	applesmc_idev->poll_interval = APPLESMC_POLL_INTERVAL;
-
 	/* initial calibrate for the input device */
 	applesmc_calibrate();
 
 	/* initialize the input device */
-	idev = applesmc_idev->input;
-	idev->name = "applesmc";
-	idev->id.bustype = BUS_HOST;
-	idev->dev.parent = &pdev->dev;
-	idev->evbit[0] = BIT_MASK(EV_ABS);
-	input_set_abs_params(idev, ABS_X,
+	applesmc_idev->name = "applesmc";
+	applesmc_idev->id.bustype = BUS_HOST;
+	applesmc_idev->dev.parent = &pdev->dev;
+	input_set_abs_params(applesmc_idev, ABS_X,
 			-256, 256, APPLESMC_INPUT_FUZZ, APPLESMC_INPUT_FLAT);
-	input_set_abs_params(idev, ABS_Y,
+	input_set_abs_params(applesmc_idev, ABS_Y,
 			-256, 256, APPLESMC_INPUT_FUZZ, APPLESMC_INPUT_FLAT);
 
-	ret = input_register_polled_device(applesmc_idev);
+	ret = input_setup_polling(applesmc_idev, applesmc_idev_poll);
+	if (ret)
+		goto out_idev;
+
+	input_set_poll_interval(applesmc_idev, APPLESMC_POLL_INTERVAL);
+
+	ret = input_register_device(applesmc_idev);
 	if (ret)
 		goto out_idev;
 
 	return 0;
 
 out_idev:
-	input_free_polled_device(applesmc_idev);
+	input_free_device(applesmc_idev);
 
 out_sysfs:
 	applesmc_destroy_nodes(accelerometer_group);
@@ -1189,8 +1188,7 @@ static void applesmc_release_accelerometer(void)
 {
 	if (!smcreg.has_accelerometer)
 		return;
-	input_unregister_polled_device(applesmc_idev);
-	input_free_polled_device(applesmc_idev);
+	input_unregister_device(applesmc_idev);
 	applesmc_destroy_nodes(accelerometer_group);
 }
 

drivers/hwmon/aspeed-pwm-tacho.c

@@ -891,17 +891,12 @@ static int aspeed_pwm_tacho_probe(struct platform_device *pdev)
 	struct device_node *np, *child;
 	struct aspeed_pwm_tacho_data *priv;
 	void __iomem *regs;
-	struct resource *res;
 	struct device *hwmon;
 	struct clk *clk;
 	int ret;
 
 	np = dev->of_node;
-
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res)
-		return -ENOENT;
-	regs = devm_ioremap_resource(dev, res);
+	regs = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(regs))
 		return PTR_ERR(regs);
 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);

drivers/hwmon/dell-smm-hwmon.c

@@ -68,6 +68,8 @@ static uint i8k_pwm_mult;
 static uint i8k_fan_max = I8K_FAN_HIGH;
 static bool disallow_fan_type_call;
 static bool disallow_fan_support;
+static unsigned int manual_fan;
+static unsigned int auto_fan;
 
 #define I8K_HWMON_HAVE_TEMP1	(1 << 0)
 #define I8K_HWMON_HAVE_TEMP2	(1 << 1)
@@ -300,6 +302,20 @@ static int i8k_get_fan_nominal_speed(int fan, int speed)
 	return i8k_smm(&regs) ? : (regs.eax & 0xffff) * i8k_fan_mult;
 }
 
+/*
+ * Enable or disable automatic BIOS fan control support
+ */
+static int i8k_enable_fan_auto_mode(bool enable)
+{
+	struct smm_regs regs = { };
+
+	if (disallow_fan_support)
+		return -EINVAL;
+
+	regs.eax = enable ? auto_fan : manual_fan;
+	return i8k_smm(&regs);
+}
+
 /*
  * Set the fan speed (off, low, high). Returns the new fan status.
  */
@@ -726,6 +742,35 @@ static ssize_t i8k_hwmon_pwm_store(struct device *dev,
 	return err < 0 ? -EIO : count;
 }
 
+static ssize_t i8k_hwmon_pwm_enable_store(struct device *dev,
+					  struct device_attribute *attr,
+					  const char *buf, size_t count)
+{
+	int err;
+	bool enable;
+	unsigned long val;
+
+	if (!auto_fan)
+		return -ENODEV;
+
+	err = kstrtoul(buf, 10, &val);
+	if (err)
+		return err;
+
+	if (val == 1)
+		enable = false;
+	else if (val == 2)
+		enable = true;
+	else
+		return -EINVAL;
+
+	mutex_lock(&i8k_mutex);
+	err = i8k_enable_fan_auto_mode(enable);
+	mutex_unlock(&i8k_mutex);
+
+	return err ? err : count;
+}
+
 static SENSOR_DEVICE_ATTR_RO(temp1_input, i8k_hwmon_temp, 0);
 static SENSOR_DEVICE_ATTR_RO(temp1_label, i8k_hwmon_temp_label, 0);
 static SENSOR_DEVICE_ATTR_RO(temp2_input, i8k_hwmon_temp, 1);
@@ -749,6 +794,7 @@ static SENSOR_DEVICE_ATTR_RO(temp10_label, i8k_hwmon_temp_label, 9);
 static SENSOR_DEVICE_ATTR_RO(fan1_input, i8k_hwmon_fan, 0);
 static SENSOR_DEVICE_ATTR_RO(fan1_label, i8k_hwmon_fan_label, 0);
 static SENSOR_DEVICE_ATTR_RW(pwm1, i8k_hwmon_pwm, 0);
+static SENSOR_DEVICE_ATTR_WO(pwm1_enable, i8k_hwmon_pwm_enable, 0);
 static SENSOR_DEVICE_ATTR_RO(fan2_input, i8k_hwmon_fan, 1);
 static SENSOR_DEVICE_ATTR_RO(fan2_label, i8k_hwmon_fan_label, 1);
 static SENSOR_DEVICE_ATTR_RW(pwm2, i8k_hwmon_pwm, 1);
@@ -780,12 +826,13 @@ static struct attribute *i8k_attrs[] = {
 	&sensor_dev_attr_fan1_input.dev_attr.attr,	/* 20 */
 	&sensor_dev_attr_fan1_label.dev_attr.attr,	/* 21 */
 	&sensor_dev_attr_pwm1.dev_attr.attr,		/* 22 */
-	&sensor_dev_attr_fan2_input.dev_attr.attr,	/* 23 */
-	&sensor_dev_attr_fan2_label.dev_attr.attr,	/* 24 */
-	&sensor_dev_attr_pwm2.dev_attr.attr,		/* 25 */
-	&sensor_dev_attr_fan3_input.dev_attr.attr,	/* 26 */
-	&sensor_dev_attr_fan3_label.dev_attr.attr,	/* 27 */
-	&sensor_dev_attr_pwm3.dev_attr.attr,		/* 28 */
+	&sensor_dev_attr_pwm1_enable.dev_attr.attr,	/* 23 */
+	&sensor_dev_attr_fan2_input.dev_attr.attr,	/* 24 */
+	&sensor_dev_attr_fan2_label.dev_attr.attr,	/* 25 */
+	&sensor_dev_attr_pwm2.dev_attr.attr,		/* 26 */
+	&sensor_dev_attr_fan3_input.dev_attr.attr,	/* 27 */
+	&sensor_dev_attr_fan3_label.dev_attr.attr,	/* 28 */
+	&sensor_dev_attr_pwm3.dev_attr.attr,		/* 29 */
 	NULL
 };
 
@@ -828,16 +875,19 @@ static umode_t i8k_is_visible(struct kobject *kobj, struct attribute *attr,
 	    !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP10))
 		return 0;
 
-	if (index >= 20 && index <= 22 &&
+	if (index >= 20 && index <= 23 &&
 	    !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN1))
 		return 0;
-	if (index >= 23 && index <= 25 &&
+	if (index >= 24 && index <= 26 &&
 	    !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN2))
 		return 0;
-	if (index >= 26 && index <= 28 &&
+	if (index >= 27 && index <= 29 &&
 	    !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN3))
 		return 0;
 
+	if (index == 23 && !auto_fan)
+		return 0;
+
 	return attr->mode;
 }
 
@@ -1135,12 +1185,48 @@ static struct dmi_system_id i8k_blacklist_fan_support_dmi_table[] __initdata = {
 	{ }
 };
 
+struct i8k_fan_control_data {
+	unsigned int manual_fan;
+	unsigned int auto_fan;
+};
+
+enum i8k_fan_controls {
+	I8K_FAN_34A3_35A3,
+};
+
+static const struct i8k_fan_control_data i8k_fan_control_data[] = {
+	[I8K_FAN_34A3_35A3] = {
+		.manual_fan = 0x34a3,
+		.auto_fan = 0x35a3,
+	},
+};
+
+static struct dmi_system_id i8k_whitelist_fan_control[] __initdata = {
+	{
+		.ident = "Dell Precision 5530",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Precision 5530"),
+		},
+		.driver_data = (void *)&i8k_fan_control_data[I8K_FAN_34A3_35A3],
+	},
+	{
+		.ident = "Dell Latitude E6440",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Latitude E6440"),
+		},
+		.driver_data = (void *)&i8k_fan_control_data[I8K_FAN_34A3_35A3],
+	},
+	{ }
+};
+
 /*
  * Probe for the presence of a supported laptop.
  */
 static int __init i8k_probe(void)
 {
-	const struct dmi_system_id *id;
+	const struct dmi_system_id *id, *fan_control;
 	int fan, ret;
 
 	/*
@@ -1200,6 +1286,15 @@ static int __init i8k_probe(void)
 	i8k_fan_max = fan_max ? : I8K_FAN_HIGH;	/* Must not be 0 */
 	i8k_pwm_mult = DIV_ROUND_UP(255, i8k_fan_max);
 
+	fan_control = dmi_first_match(i8k_whitelist_fan_control);
+	if (fan_control && fan_control->driver_data) {
+		const struct i8k_fan_control_data *data = fan_control->driver_data;
+
+		manual_fan = data->manual_fan;
+		auto_fan = data->auto_fan;
+		pr_info("enabling support for setting automatic/manual fan control\n");
+	}
+
 	if (!fan_mult) {
 		/*
 		 * Autodetect fan multiplier based on nominal rpm

drivers/hwmon/ina3221.c

@@ -31,6 +31,8 @@
 #define INA3221_WARN2			0x0a
 #define INA3221_CRIT3			0x0b
 #define INA3221_WARN3			0x0c
+#define INA3221_SHUNT_SUM		0x0d
+#define INA3221_CRIT_SUM		0x0e
 #define INA3221_MASK_ENABLE		0x0f
 
 #define INA3221_CONFIG_MODE_MASK	GENMASK(2, 0)
@@ -50,6 +52,8 @@
 #define INA3221_CONFIG_CHs_EN_MASK	GENMASK(14, 12)
 #define INA3221_CONFIG_CHx_EN(x)	BIT(14 - (x))
 
+#define INA3221_MASK_ENABLE_SCC_MASK	GENMASK(14, 12)
+
 #define INA3221_CONFIG_DEFAULT		0x7127
 #define INA3221_RSHUNT_DEFAULT		10000
 
@@ -60,9 +64,11 @@ enum ina3221_fields {
 	/* Status Flags */
 	F_CVRF,
 
-	/* Alert Flags */
+	/* Warning Flags */
 	F_WF3, F_WF2, F_WF1,
-	F_CF3, F_CF2, F_CF1,
+
+	/* Alert Flags: SF is the summation-alert flag */
+	F_SF, F_CF3, F_CF2, F_CF1,
 
 	/* sentinel */
 	F_MAX_FIELDS
@@ -75,6 +81,7 @@ static const struct reg_field ina3221_reg_fields[] = {
 	[F_WF3] = REG_FIELD(INA3221_MASK_ENABLE, 3, 3),
 	[F_WF2] = REG_FIELD(INA3221_MASK_ENABLE, 4, 4),
 	[F_WF1] = REG_FIELD(INA3221_MASK_ENABLE, 5, 5),
+	[F_SF] = REG_FIELD(INA3221_MASK_ENABLE, 6, 6),
 	[F_CF3] = REG_FIELD(INA3221_MASK_ENABLE, 7, 7),
 	[F_CF2] = REG_FIELD(INA3221_MASK_ENABLE, 8, 8),
 	[F_CF1] = REG_FIELD(INA3221_MASK_ENABLE, 9, 9),
@@ -107,6 +114,7 @@ struct ina3221_input {
  * @inputs: Array of channel input source specific structures
  * @lock: mutex lock to serialize sysfs attribute accesses
  * @reg_config: Register value of INA3221_CONFIG
+ * @summation_shunt_resistor: equivalent shunt resistor value for summation
  * @single_shot: running in single-shot operating mode
  */
 struct ina3221_data {
@@ -116,16 +124,51 @@ struct ina3221_data {
 	struct ina3221_input inputs[INA3221_NUM_CHANNELS];
 	struct mutex lock;
 	u32 reg_config;
+	int summation_shunt_resistor;
 
 	bool single_shot;
 };
 
 static inline bool ina3221_is_enabled(struct ina3221_data *ina, int channel)
 {
+	/* Summation channel checks shunt resistor values */
+	if (channel > INA3221_CHANNEL3)
+		return ina->summation_shunt_resistor != 0;
+
 	return pm_runtime_active(ina->pm_dev) &&
 	       (ina->reg_config & INA3221_CONFIG_CHx_EN(channel));
 }
 
+/**
+ * Helper function to return the resistor value for current summation.
+ *
+ * There is a condition to calculate current summation -- all the shunt
+ * resistor values should be the same, so as to simply fit the formula:
+ *     current summation = shunt voltage summation / shunt resistor
+ *
+ * Returns the equivalent shunt resistor value on success or 0 on failure
+ */
+static inline int ina3221_summation_shunt_resistor(struct ina3221_data *ina)
+{
+	struct ina3221_input *input = ina->inputs;
+	int i, shunt_resistor = 0;
+
+	for (i = 0; i < INA3221_NUM_CHANNELS; i++) {
+		if (input[i].disconnected || !input[i].shunt_resistor)
+			continue;
+		if (!shunt_resistor) {
+			/* Found the reference shunt resistor value */
+			shunt_resistor = input[i].shunt_resistor;
+		} else {
+			/* No summation if resistor values are different */
+			if (shunt_resistor != input[i].shunt_resistor)
+				return 0;
+		}
+	}
+
+	return shunt_resistor;
+}
+
 /* Lookup table for Bus and Shunt conversion times in usec */
 static const u16 ina3221_conv_time[] = {
 	140, 204, 332, 588, 1100, 2116, 4156, 8244,
@@ -183,7 +226,14 @@ static int ina3221_read_value(struct ina3221_data *ina, unsigned int reg,
 	if (ret)
 		return ret;
 
-	*val = sign_extend32(regval >> 3, 12);
+	/*
+	 * Shunt Voltage Sum register has 14-bit value with 1-bit shift
+	 * Other Shunt Voltage registers have 12 bits with 3-bit shift
+	 */
+	if (reg == INA3221_SHUNT_SUM)
+		*val = sign_extend32(regval >> 1, 14);
+	else
+		*val = sign_extend32(regval >> 3, 12);
 
 	return 0;
 }
@@ -195,6 +245,7 @@ static const u8 ina3221_in_reg[] = {
 	INA3221_SHUNT1,
 	INA3221_SHUNT2,
 	INA3221_SHUNT3,
+	INA3221_SHUNT_SUM,
 };
 
 static int ina3221_read_chip(struct device *dev, u32 attr, long *val)
@@ -224,8 +275,12 @@ static int ina3221_read_in(struct device *dev, u32 attr, int channel, long *val)
 	u8 reg = ina3221_in_reg[channel];
 	int regval, ret;
 
-	/* Translate shunt channel index to sensor channel index */
-	channel %= INA3221_NUM_CHANNELS;
+	/*
+	 * Translate shunt channel index to sensor channel index except
+	 * the 7th channel (6 since being 0-aligned) is for summation.
+	 */
+	if (channel != 6)
+		channel %= INA3221_NUM_CHANNELS;
 
 	switch (attr) {
 	case hwmon_in_input:
@@ -259,22 +314,29 @@ static int ina3221_read_in(struct device *dev, u32 attr, int channel, long *val)
 	}
 }
 
-static const u8 ina3221_curr_reg[][INA3221_NUM_CHANNELS] = {
-	[hwmon_curr_input] = { INA3221_SHUNT1, INA3221_SHUNT2, INA3221_SHUNT3 },
-	[hwmon_curr_max] = { INA3221_WARN1, INA3221_WARN2, INA3221_WARN3 },
-	[hwmon_curr_crit] = { INA3221_CRIT1, INA3221_CRIT2, INA3221_CRIT3 },
-	[hwmon_curr_max_alarm] = { F_WF1, F_WF2, F_WF3 },
-	[hwmon_curr_crit_alarm] = { F_CF1, F_CF2, F_CF3 },
+static const u8 ina3221_curr_reg[][INA3221_NUM_CHANNELS + 1] = {
+	[hwmon_curr_input] = { INA3221_SHUNT1, INA3221_SHUNT2,
+			       INA3221_SHUNT3, INA3221_SHUNT_SUM },
+	[hwmon_curr_max] = { INA3221_WARN1, INA3221_WARN2, INA3221_WARN3, 0 },
+	[hwmon_curr_crit] = { INA3221_CRIT1, INA3221_CRIT2,
+			      INA3221_CRIT3, INA3221_CRIT_SUM },
+	[hwmon_curr_max_alarm] = { F_WF1, F_WF2, F_WF3, 0 },
+	[hwmon_curr_crit_alarm] = { F_CF1, F_CF2, F_CF3, F_SF },
 };
 
 static int ina3221_read_curr(struct device *dev, u32 attr,
 			     int channel, long *val)
 {
 	struct ina3221_data *ina = dev_get_drvdata(dev);
-	struct ina3221_input *input = &ina->inputs[channel];
-	int resistance_uo = input->shunt_resistor;
+	struct ina3221_input *input = ina->inputs;
 	u8 reg = ina3221_curr_reg[attr][channel];
-	int regval, voltage_nv, ret;
+	int resistance_uo, voltage_nv;
+	int regval, ret;
+
+	if (channel > INA3221_CHANNEL3)
+		resistance_uo = ina->summation_shunt_resistor;
+	else
+		resistance_uo = input[channel].shunt_resistor;
 
 	switch (attr) {
 	case hwmon_curr_input:
@@ -293,6 +355,9 @@ static int ina3221_read_curr(struct device *dev, u32 attr,
 		/* fall through */
 	case hwmon_curr_crit:
 	case hwmon_curr_max:
+		if (!resistance_uo)
+			return -ENODATA;
+
 		ret = ina3221_read_value(ina, reg, &regval);
 		if (ret)
 			return ret;
@@ -366,10 +431,18 @@ static int ina3221_write_curr(struct device *dev, u32 attr,
 			      int channel, long val)
 {
 	struct ina3221_data *ina = dev_get_drvdata(dev);
-	struct ina3221_input *input = &ina->inputs[channel];
-	int resistance_uo = input->shunt_resistor;
+	struct ina3221_input *input = ina->inputs;
 	u8 reg = ina3221_curr_reg[attr][channel];
-	int regval, current_ma, voltage_uv;
+	int resistance_uo, current_ma, voltage_uv;
+	int regval;
+
+	if (channel > INA3221_CHANNEL3)
+		resistance_uo = ina->summation_shunt_resistor;
+	else
+		resistance_uo = input[channel].shunt_resistor;
+
+	if (!resistance_uo)
+		return -EOPNOTSUPP;
 
 	/* clamp current */
 	current_ma = clamp_val(val,
@@ -381,8 +454,21 @@ static int ina3221_write_curr(struct device *dev, u32 attr,
 	/* clamp voltage */
 	voltage_uv = clamp_val(voltage_uv, -163800, 163800);
 
-	/* 1 / 40uV(scale) << 3(register shift) = 5 */
-	regval = DIV_ROUND_CLOSEST(voltage_uv, 5) & 0xfff8;
+	/*
+	 * Formula to convert voltage_uv to register value:
+	 *     regval = (voltage_uv / scale) << shift
+	 * Note:
+	 *     The scale is 40uV for all shunt voltage registers
+	 *     Shunt Voltage Sum register left-shifts 1 bit
+	 *     All other Shunt Voltage registers shift 3 bits
+	 * Results:
+	 *     SHUNT_SUM: (1 / 40uV) << 1 = 1 / 20uV
+	 *     SHUNT[1-3]: (1 / 40uV) << 3 = 1 / 5uV
+	 */
+	if (reg == INA3221_SHUNT_SUM)
+		regval = DIV_ROUND_CLOSEST(voltage_uv, 20) & 0xfffe;
+	else
+		regval = DIV_ROUND_CLOSEST(voltage_uv, 5) & 0xfff8;
 
 	return regmap_write(ina->regmap, reg, regval);
 }
@@ -499,7 +585,10 @@ static int ina3221_read_string(struct device *dev, enum hwmon_sensor_types type,
 	struct ina3221_data *ina = dev_get_drvdata(dev);
 	int index = channel - 1;
 
-	*str = ina->inputs[index].label;
+	if (channel == 7)
+		*str = "sum of shunt voltages";
+	else
+		*str = ina->inputs[index].label;
 
 	return 0;
 }
@@ -529,6 +618,8 @@ static umode_t ina3221_is_visible(const void *drvdata,
 		case hwmon_in_label:
 			if (channel - 1 <= INA3221_CHANNEL3)
 				input = &ina->inputs[channel - 1];
+			else if (channel == 7)
+				return 0444;
 			/* Hide label node if label is not provided */
 			return (input && input->label) ? 0444 : 0;
 		case hwmon_in_input:
@@ -573,11 +664,16 @@ static const struct hwmon_channel_info *ina3221_info[] = {
 			   /* 4-6: shunt voltage Channels */
 			   HWMON_I_INPUT,
 			   HWMON_I_INPUT,
-			   HWMON_I_INPUT),
+			   HWMON_I_INPUT,
+			   /* 7: summation of shunt voltage channels */
+			   HWMON_I_INPUT | HWMON_I_LABEL),
 	HWMON_CHANNEL_INFO(curr,
+			   /* 1-3: current channels*/
+			   INA3221_HWMON_CURR_CONFIG,
 			   INA3221_HWMON_CURR_CONFIG,
 			   INA3221_HWMON_CURR_CONFIG,
-			   INA3221_HWMON_CURR_CONFIG),
+			   /* 4: summation of current channels */
+			   HWMON_C_INPUT | HWMON_C_CRIT | HWMON_C_CRIT_ALARM),
 	NULL
 };
 
@@ -624,6 +720,9 @@ static ssize_t ina3221_shunt_store(struct device *dev,
 
 	input->shunt_resistor = val;
 
+	/* Update summation_shunt_resistor for summation channel */
+	ina->summation_shunt_resistor = ina3221_summation_shunt_resistor(ina);
+
 	return count;
 }
 
@@ -642,6 +741,7 @@ ATTRIBUTE_GROUPS(ina3221);
 
 static const struct regmap_range ina3221_yes_ranges[] = {
 	regmap_reg_range(INA3221_CONFIG, INA3221_BUS3),
+	regmap_reg_range(INA3221_SHUNT_SUM, INA3221_SHUNT_SUM),
 	regmap_reg_range(INA3221_MASK_ENABLE, INA3221_MASK_ENABLE),
 };
 
@@ -772,6 +872,9 @@ static int ina3221_probe(struct i2c_client *client,
 			ina->reg_config &= ~INA3221_CONFIG_CHx_EN(i);
 	}
 
+	/* Initialize summation_shunt_resistor for summation channel control */
+	ina->summation_shunt_resistor = ina3221_summation_shunt_resistor(ina);
+
 	ina->pm_dev = dev;
 	mutex_init(&ina->lock);
 	dev_set_drvdata(dev, ina);
@@ -875,6 +978,22 @@ static int __maybe_unused ina3221_resume(struct device *dev)
 	if (ret)
 		return ret;
 
+	/* Initialize summation channel control */
+	if (ina->summation_shunt_resistor) {
+		/*
+		 * Take all three channels into summation by default
+		 * Shunt measurements of disconnected channels should
+		 * be 0, so it does not matter for summation.
+		 */
+		ret = regmap_update_bits(ina->regmap, INA3221_MASK_ENABLE,
+					 INA3221_MASK_ENABLE_SCC_MASK,
+					 INA3221_MASK_ENABLE_SCC_MASK);
+		if (ret) {
+			dev_err(dev, "Unable to control summation channel\n");
+			return ret;
+		}
+	}
+
 	return 0;
 }
 

drivers/hwmon/ltc2947-core.c

+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Analog Devices LTC2947 high precision power and energy monitor
+ *
+ * Copyright 2019 Analog Devices Inc.
+ */
+#include <linux/bitfield.h>
+#include <linux/bits.h>
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/regmap.h>
+
+#include "ltc2947.h"
+
+/* register's */
+#define LTC2947_REG_PAGE_CTRL		0xFF
+#define LTC2947_REG_CTRL		0xF0
+#define LTC2947_REG_TBCTL		0xE9
+#define LTC2947_CONT_MODE_MASK		BIT(3)
+#define LTC2947_CONT_MODE(x)		FIELD_PREP(LTC2947_CONT_MODE_MASK, x)
+#define LTC2947_PRE_MASK		GENMASK(2, 0)
+#define LTC2947_PRE(x)			FIELD_PREP(LTC2947_PRE_MASK, x)
+#define LTC2947_DIV_MASK		GENMASK(7, 3)
+#define LTC2947_DIV(x)			FIELD_PREP(LTC2947_DIV_MASK, x)
+#define LTC2947_SHUTDOWN_MASK		BIT(0)
+#define LTC2947_REG_ACCUM_POL		0xE1
+#define LTC2947_ACCUM_POL_1_MASK	GENMASK(1, 0)
+#define LTC2947_ACCUM_POL_1(x)		FIELD_PREP(LTC2947_ACCUM_POL_1_MASK, x)
+#define LTC2947_ACCUM_POL_2_MASK	GENMASK(3, 2)
+#define LTC2947_ACCUM_POL_2(x)		FIELD_PREP(LTC2947_ACCUM_POL_2_MASK, x)
+#define LTC2947_REG_ACCUM_DEADBAND	0xE4
+#define LTC2947_REG_GPIOSTATCTL		0x67
+#define LTC2947_GPIO_EN_MASK		BIT(0)
+#define LTC2947_GPIO_EN(x)		FIELD_PREP(LTC2947_GPIO_EN_MASK, x)
+#define LTC2947_GPIO_FAN_EN_MASK	BIT(6)
+#define LTC2947_GPIO_FAN_EN(x)		FIELD_PREP(LTC2947_GPIO_FAN_EN_MASK, x)
+#define LTC2947_GPIO_FAN_POL_MASK	BIT(7)
+#define LTC2947_GPIO_FAN_POL(x)		FIELD_PREP(LTC2947_GPIO_FAN_POL_MASK, x)
+#define LTC2947_REG_GPIO_ACCUM		0xE3
+/* 200Khz */
+#define LTC2947_CLK_MIN			200000
+/* 25Mhz */
+#define LTC2947_CLK_MAX			25000000
+#define LTC2947_PAGE0			0
+#define LTC2947_PAGE1			1
+/* Voltage registers */
+#define LTC2947_REG_VOLTAGE		0xA0
+#define LTC2947_REG_VOLTAGE_MAX		0x50
+#define LTC2947_REG_VOLTAGE_MIN		0x52
+#define LTC2947_REG_VOLTAGE_THRE_H	0x90
+#define LTC2947_REG_VOLTAGE_THRE_L	0x92
+#define LTC2947_REG_DVCC		0xA4
+#define LTC2947_REG_DVCC_MAX		0x58
+#define LTC2947_REG_DVCC_MIN		0x5A
+#define LTC2947_REG_DVCC_THRE_H		0x98
+#define LTC2947_REG_DVCC_THRE_L		0x9A
+#define LTC2947_VOLTAGE_GEN_CHAN	0
+#define LTC2947_VOLTAGE_DVCC_CHAN	1
+/* in mV */
+#define VOLTAGE_MAX			15500
+#define VOLTAGE_MIN			-300
+#define VDVCC_MAX			15000
+#define VDVCC_MIN			4750
+/* Current registers */
+#define LTC2947_REG_CURRENT		0x90
+#define LTC2947_REG_CURRENT_MAX		0x40
+#define LTC2947_REG_CURRENT_MIN		0x42
+#define LTC2947_REG_CURRENT_THRE_H	0x80
+#define LTC2947_REG_CURRENT_THRE_L	0x82
+/* in mA */
+#define CURRENT_MAX			30000
+#define CURRENT_MIN			-30000
+/* Power registers */
+#define LTC2947_REG_POWER		0x93
+#define LTC2947_REG_POWER_MAX		0x44
+#define LTC2947_REG_POWER_MIN		0x46
+#define LTC2947_REG_POWER_THRE_H	0x84
+#define LTC2947_REG_POWER_THRE_L	0x86
+/* in uW */
+#define POWER_MAX			450000000
+#define POWER_MIN			-450000000
+/* Temperature registers */
+#define LTC2947_REG_TEMP		0xA2
+#define LTC2947_REG_TEMP_MAX		0x54
+#define LTC2947_REG_TEMP_MIN		0x56
+#define LTC2947_REG_TEMP_THRE_H		0x94
+#define LTC2947_REG_TEMP_THRE_L		0x96
+#define LTC2947_REG_TEMP_FAN_THRE_H	0x9C
+#define LTC2947_REG_TEMP_FAN_THRE_L	0x9E
+#define LTC2947_TEMP_FAN_CHAN		1
+/* in millidegress Celsius */
+#define TEMP_MAX			85000
+#define TEMP_MIN			-40000
+/* Energy registers */
+#define LTC2947_REG_ENERGY1		0x06
+#define LTC2947_REG_ENERGY2		0x16
+/* Status/Alarm/Overflow registers */
+#define LTC2947_REG_STATUS		0x80
+#define LTC2947_REG_STATVT		0x81
+#define LTC2947_REG_STATIP		0x82
+#define LTC2947_REG_STATVDVCC		0x87
+
+#define LTC2947_ALERTS_SIZE	(LTC2947_REG_STATVDVCC - LTC2947_REG_STATUS)
+#define LTC2947_MAX_VOLTAGE_MASK	BIT(0)
+#define LTC2947_MIN_VOLTAGE_MASK	BIT(1)
+#define LTC2947_MAX_CURRENT_MASK	BIT(0)
+#define LTC2947_MIN_CURRENT_MASK	BIT(1)
+#define LTC2947_MAX_POWER_MASK		BIT(2)
+#define LTC2947_MIN_POWER_MASK		BIT(3)
+#define LTC2947_MAX_TEMP_MASK		BIT(2)
+#define LTC2947_MIN_TEMP_MASK		BIT(3)
+#define LTC2947_MAX_TEMP_FAN_MASK	BIT(4)
+#define LTC2947_MIN_TEMP_FAN_MASK	BIT(5)
+
+struct ltc2947_data {
+	struct regmap *map;
+	struct device *dev;
+	/*
+	 * The mutex is needed because the device has 2 memory pages. When
+	 * reading/writing the correct page needs to be set so that, the
+	 * complete sequence select_page->read/write needs to be protected.
+	 */
+	struct mutex lock;
+	u32 lsb_energy;
+	bool gpio_out;
+};
+
+static int __ltc2947_val_read16(const struct ltc2947_data *st, const u8 reg,
+				u64 *val)
+{
+	__be16 __val = 0;
+	int ret;
+
+	ret = regmap_bulk_read(st->map, reg, &__val, 2);
+	if (ret)
+		return ret;
+
+	*val = be16_to_cpu(__val);
+
+	return 0;
+}
+
+static int __ltc2947_val_read24(const struct ltc2947_data *st, const u8 reg,
+				u64 *val)
+{
+	__be32 __val = 0;
+	int ret;
+
+	ret = regmap_bulk_read(st->map, reg, &__val, 3);
+	if (ret)
+		return ret;
+
+	*val = be32_to_cpu(__val) >> 8;
+
+	return 0;
+}
+
+static int __ltc2947_val_read64(const struct ltc2947_data *st, const u8 reg,
+				u64 *val)
+{
+	__be64 __val = 0;
+	int ret;
+
+	ret = regmap_bulk_read(st->map, reg, &__val, 6);
+	if (ret)
+		return ret;
+
+	*val = be64_to_cpu(__val) >> 16;
+
+	return 0;
+}
+
+static int ltc2947_val_read(struct ltc2947_data *st, const u8 reg,
+			    const u8 page, const size_t size, s64 *val)
+{
+	int ret;
+	u64 __val = 0;
+
+	mutex_lock(&st->lock);
+
+	ret = regmap_write(st->map, LTC2947_REG_PAGE_CTRL, page);
+	if (ret) {
+		mutex_unlock(&st->lock);
+		return ret;
+	}
+
+	dev_dbg(st->dev, "Read val, reg:%02X, p:%d sz:%zu\n", reg, page,
+		size);
+
+	switch (size) {
+	case 2:
+		ret = __ltc2947_val_read16(st, reg, &__val);
+		break;
+	case 3:
+		ret = __ltc2947_val_read24(st, reg, &__val);
+		break;
+	case 6:
+		ret = __ltc2947_val_read64(st, reg, &__val);
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+	mutex_unlock(&st->lock);
+
+	if (ret)
+		return ret;
+
+	*val = sign_extend64(__val, (8 * size) - 1);
+
+	dev_dbg(st->dev, "Got s:%lld, u:%016llX\n", *val, __val);
+
+	return 0;
+}
+
+static int __ltc2947_val_write64(const struct ltc2947_data *st, const u8 reg,
+				 const u64 val)
+{
+	__be64 __val;
+
+	__val = cpu_to_be64(val << 16);
+	return regmap_bulk_write(st->map, reg, &__val, 6);
+}
+
+static int __ltc2947_val_write16(const struct ltc2947_data *st, const u8 reg,
+				 const u16 val)
+{
+	__be16 __val;
+
+	__val = cpu_to_be16(val);
+	return regmap_bulk_write(st->map, reg, &__val, 2);
+}
+
+static int ltc2947_val_write(struct ltc2947_data *st, const u8 reg,
+			     const u8 page, const size_t size, const u64 val)
+{
+	int ret;
+
+	mutex_lock(&st->lock);
+	/* set device on correct page */
+	ret = regmap_write(st->map, LTC2947_REG_PAGE_CTRL, page);
+	if (ret) {
+		mutex_unlock(&st->lock);
+		return ret;
+	}
+
+	dev_dbg(st->dev, "Write val, r:%02X, p:%d, sz:%zu, val:%016llX\n",
+		reg, page, size, val);
+
+	switch (size) {
+	case 2:
+		ret = __ltc2947_val_write16(st, reg, val);
+		break;
+	case 6:
+		ret = __ltc2947_val_write64(st, reg, val);
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+	mutex_unlock(&st->lock);
+
+	return ret;
+}
+
+static int ltc2947_reset_history(struct ltc2947_data *st, const u8 reg_h,
+				 const u8 reg_l)
+{
+	int ret;
+	/*
+	 * let's reset the tracking register's. Tracking register's have all
+	 * 2 bytes size
+	 */
+	ret = ltc2947_val_write(st, reg_h, LTC2947_PAGE0, 2, 0x8000U);
+	if (ret)
+		return ret;
+
+	return ltc2947_val_write(st, reg_l, LTC2947_PAGE0, 2, 0x7FFFU);
+}
+
+static int ltc2947_alarm_read(struct ltc2947_data *st, const u8 reg,
+			      const u32 mask, long *val)
+{
+	u8 offset = reg - LTC2947_REG_STATUS;
+	/* +1 to include status reg */
+	char alarms[LTC2947_ALERTS_SIZE + 1];
+	int ret = 0;
+
+	memset(alarms, 0, sizeof(alarms));
+
+	mutex_lock(&st->lock);
+
+	ret = regmap_write(st->map, LTC2947_REG_PAGE_CTRL, LTC2947_PAGE0);
+	if (ret)
+		goto unlock;
+
+	dev_dbg(st->dev, "Read alarm, reg:%02X, mask:%02X\n", reg, mask);
+	/*
+	 * As stated in the datasheet, when Threshold and Overflow registers
+	 * are used, the status and all alert registers must be read in one
+	 * multi-byte transaction.
+	 */
+	ret = regmap_bulk_read(st->map, LTC2947_REG_STATUS, alarms,
+			       sizeof(alarms));
+	if (ret)
+		goto unlock;
+
+	/* get the alarm */
+	*val = !!(alarms[offset] & mask);
+unlock:
+	mutex_unlock(&st->lock);
+	return ret;
+}
+
+static ssize_t ltc2947_show_value(struct device *dev,
+				  struct device_attribute *da, char *buf)
+{
+	struct ltc2947_data *st = dev_get_drvdata(dev);
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
+	int ret;
+	s64 val = 0;
+
+	ret = ltc2947_val_read(st, attr->index, LTC2947_PAGE0, 6, &val);
+	if (ret)
+		return ret;
+
+	/* value in microJoule. st->lsb_energy was multiplied by 10E9 */
+	val = div_s64(val * st->lsb_energy, 1000);
+
+	return sprintf(buf, "%lld\n", val);
+}
+
+static int ltc2947_read_temp(struct device *dev, const u32 attr, long *val,
+			     const int channel)
+{
+	int ret;
+	struct ltc2947_data *st = dev_get_drvdata(dev);
+	s64 __val = 0;
+
+	switch (attr) {
+	case hwmon_temp_input:
+		ret = ltc2947_val_read(st, LTC2947_REG_TEMP, LTC2947_PAGE0,
+				       2, &__val);
+		break;
+	case hwmon_temp_highest:
+		ret = ltc2947_val_read(st, LTC2947_REG_TEMP_MAX, LTC2947_PAGE0,
+				       2, &__val);
+		break;
+	case hwmon_temp_lowest:
+		ret = ltc2947_val_read(st, LTC2947_REG_TEMP_MIN, LTC2947_PAGE0,
+				       2, &__val);
+		break;
+	case hwmon_temp_max_alarm:
+		if (channel == LTC2947_TEMP_FAN_CHAN)
+			return ltc2947_alarm_read(st, LTC2947_REG_STATVT,
+						  LTC2947_MAX_TEMP_FAN_MASK,
+						  val);
+
+		return ltc2947_alarm_read(st, LTC2947_REG_STATVT,
+					  LTC2947_MAX_TEMP_MASK, val);
+	case hwmon_temp_min_alarm:
+		if (channel == LTC2947_TEMP_FAN_CHAN)
+			return	ltc2947_alarm_read(st, LTC2947_REG_STATVT,
+						   LTC2947_MIN_TEMP_FAN_MASK,
+						   val);
+
+		return	ltc2947_alarm_read(st, LTC2947_REG_STATVT,
+					   LTC2947_MIN_TEMP_MASK, val);
+	case hwmon_temp_max:
+		if (channel == LTC2947_TEMP_FAN_CHAN)
+			ret = ltc2947_val_read(st, LTC2947_REG_TEMP_FAN_THRE_H,
+					       LTC2947_PAGE1, 2, &__val);
+		else
+			ret = ltc2947_val_read(st, LTC2947_REG_TEMP_THRE_H,
+					       LTC2947_PAGE1, 2, &__val);
+		break;
+	case hwmon_temp_min:
+		if (channel == LTC2947_TEMP_FAN_CHAN)
+			ret = ltc2947_val_read(st, LTC2947_REG_TEMP_FAN_THRE_L,
+					       LTC2947_PAGE1, 2, &__val);
+		else
+			ret = ltc2947_val_read(st, LTC2947_REG_TEMP_THRE_L,
+					       LTC2947_PAGE1, 2, &__val);
+		break;
+	default:
+		return -ENOTSUPP;
+	}
+
+	if (ret)
+		return ret;
+
+	/* in milidegrees celcius, temp is given by: */
+	*val = (__val * 204) + 550;
+
+	return 0;
+}
+
+static int ltc2947_read_power(struct device *dev, const u32 attr, long *val)
+{
+	struct ltc2947_data *st = dev_get_drvdata(dev);
+	int ret;
+	u32 lsb = 200000; /* in uW */
+	s64 __val = 0;
+
+	switch (attr) {
+	case hwmon_power_input:
+		ret = ltc2947_val_read(st, LTC2947_REG_POWER, LTC2947_PAGE0,
+				       3, &__val);
+		lsb = 50000;
+		break;
+	case hwmon_power_input_highest:
+		ret = ltc2947_val_read(st, LTC2947_REG_POWER_MAX, LTC2947_PAGE0,
+				       2, &__val);
+		break;
+	case hwmon_power_input_lowest:
+		ret = ltc2947_val_read(st, LTC2947_REG_POWER_MIN, LTC2947_PAGE0,
+				       2, &__val);
+		break;
+	case hwmon_power_max_alarm:
+		return ltc2947_alarm_read(st, LTC2947_REG_STATIP,
+					  LTC2947_MAX_POWER_MASK, val);
+	case hwmon_power_min_alarm:
+		return ltc2947_alarm_read(st, LTC2947_REG_STATIP,
+					  LTC2947_MIN_POWER_MASK, val);
+	case hwmon_power_max:
+		ret = ltc2947_val_read(st, LTC2947_REG_POWER_THRE_H,
+				       LTC2947_PAGE1, 2, &__val);
+		break;
+	case hwmon_power_min:
+		ret = ltc2947_val_read(st, LTC2947_REG_POWER_THRE_L,
+				       LTC2947_PAGE1, 2, &__val);
+		break;
+	default:
+		return -ENOTSUPP;
+	}
+
+	if (ret)
+		return ret;
+
+	*val = __val * lsb;
+
+	return 0;
+}
+
+static int ltc2947_read_curr(struct device *dev, const u32 attr, long *val)
+{
+	struct ltc2947_data *st = dev_get_drvdata(dev);
+	int ret;
+	u8 lsb = 12; /* in mA */
+	s64 __val = 0;
+
+	switch (attr) {
+	case hwmon_curr_input:
+		ret = ltc2947_val_read(st, LTC2947_REG_CURRENT,
+				       LTC2947_PAGE0, 3, &__val);
+		lsb = 3;
+		break;
+	case hwmon_curr_highest:
+		ret = ltc2947_val_read(st, LTC2947_REG_CURRENT_MAX,
+				       LTC2947_PAGE0, 2, &__val);
+		break;
+	case hwmon_curr_lowest:
+		ret = ltc2947_val_read(st, LTC2947_REG_CURRENT_MIN,
+				       LTC2947_PAGE0, 2, &__val);
+		break;
+	case hwmon_curr_max_alarm:
+		return ltc2947_alarm_read(st, LTC2947_REG_STATIP,
+					  LTC2947_MAX_CURRENT_MASK, val);
+	case hwmon_curr_min_alarm:
+		return ltc2947_alarm_read(st, LTC2947_REG_STATIP,
+					  LTC2947_MIN_CURRENT_MASK, val);
+	case hwmon_curr_max:
+		ret = ltc2947_val_read(st, LTC2947_REG_CURRENT_THRE_H,
+				       LTC2947_PAGE1, 2, &__val);
+		break;
+	case hwmon_curr_min:
+		ret = ltc2947_val_read(st, LTC2947_REG_CURRENT_THRE_L,
+				       LTC2947_PAGE1, 2, &__val);
+		break;
+	default:
+		return -ENOTSUPP;
+	}
+
+	if (ret)
+		return ret;
+
+	*val = __val * lsb;
+
+	return 0;
+}
+
+static int ltc2947_read_in(struct device *dev, const u32 attr, long *val,
+			   const int channel)
+{
+	struct ltc2947_data *st = dev_get_drvdata(dev);
+	int ret;
+	u8 lsb = 2; /* in mV */
+	s64 __val = 0;
+
+	if (channel < 0 || channel > LTC2947_VOLTAGE_DVCC_CHAN) {
+		dev_err(st->dev, "Invalid chan%d for voltage", channel);
+		return -EINVAL;
+	}
+
+	switch (attr) {
+	case hwmon_in_input:
+		if (channel == LTC2947_VOLTAGE_DVCC_CHAN) {
+			ret = ltc2947_val_read(st, LTC2947_REG_DVCC,
+					       LTC2947_PAGE0, 2, &__val);
+			lsb = 145;
+		} else {
+			ret = ltc2947_val_read(st, LTC2947_REG_VOLTAGE,
+					       LTC2947_PAGE0, 2, &__val);
+		}
+		break;
+	case hwmon_in_highest:
+		if (channel == LTC2947_VOLTAGE_DVCC_CHAN) {
+			ret = ltc2947_val_read(st, LTC2947_REG_DVCC_MAX,
+					       LTC2947_PAGE0, 2, &__val);
+			lsb = 145;
+		} else {
+			ret = ltc2947_val_read(st, LTC2947_REG_VOLTAGE_MAX,
+					       LTC2947_PAGE0, 2, &__val);
+		}
+		break;
+	case hwmon_in_lowest:
+		if (channel == LTC2947_VOLTAGE_DVCC_CHAN) {
+			ret = ltc2947_val_read(st, LTC2947_REG_DVCC_MIN,
+					       LTC2947_PAGE0, 2, &__val);
+			lsb = 145;
+		} else {
+			ret = ltc2947_val_read(st, LTC2947_REG_VOLTAGE_MIN,
+					       LTC2947_PAGE0, 2, &__val);
+		}
+		break;
+	case hwmon_in_max_alarm:
+		if (channel == LTC2947_VOLTAGE_DVCC_CHAN)
+			return ltc2947_alarm_read(st, LTC2947_REG_STATVDVCC,
+						  LTC2947_MAX_VOLTAGE_MASK,
+						  val);
+
+		return ltc2947_alarm_read(st, LTC2947_REG_STATVT,
+					  LTC2947_MAX_VOLTAGE_MASK, val);
+	case hwmon_in_min_alarm:
+		if (channel == LTC2947_VOLTAGE_DVCC_CHAN)
+			return ltc2947_alarm_read(st, LTC2947_REG_STATVDVCC,
+						  LTC2947_MIN_VOLTAGE_MASK,
+						  val);
+
+		return ltc2947_alarm_read(st, LTC2947_REG_STATVT,
+					  LTC2947_MIN_VOLTAGE_MASK, val);
+	case hwmon_in_max:
+		if (channel == LTC2947_VOLTAGE_DVCC_CHAN) {
+			ret = ltc2947_val_read(st, LTC2947_REG_DVCC_THRE_H,
+					       LTC2947_PAGE1, 2, &__val);
+			lsb = 145;
+		} else {
+			ret = ltc2947_val_read(st, LTC2947_REG_VOLTAGE_THRE_H,
+					       LTC2947_PAGE1, 2, &__val);
+		}
+		break;
+	case hwmon_in_min:
+		if (channel == LTC2947_VOLTAGE_DVCC_CHAN) {
+			ret = ltc2947_val_read(st, LTC2947_REG_DVCC_THRE_L,
+					       LTC2947_PAGE1, 2, &__val);
+			lsb = 145;
+		} else {
+			ret = ltc2947_val_read(st, LTC2947_REG_VOLTAGE_THRE_L,
+					       LTC2947_PAGE1, 2, &__val);
+		}
+		break;
+	default:
+		return -ENOTSUPP;
+	}
+
+	if (ret)
+		return ret;
+
+	*val = __val * lsb;
+
+	return 0;
+}
+
+static int ltc2947_read(struct device *dev, enum hwmon_sensor_types type,
+			u32 attr, int channel, long *val)
+{
+	switch (type) {
+	case hwmon_in:
+		return ltc2947_read_in(dev, attr, val, channel);
+	case hwmon_curr:
+		return ltc2947_read_curr(dev, attr, val);
+	case hwmon_power:
+		return ltc2947_read_power(dev, attr, val);
+	case hwmon_temp:
+		return ltc2947_read_temp(dev, attr, val, channel);
+	default:
+		return -ENOTSUPP;
+	}
+}
+
+static int ltc2947_write_temp(struct device *dev, const u32 attr,
+			      long val, const int channel)
+{
+	struct ltc2947_data *st = dev_get_drvdata(dev);
+
+	if (channel < 0 || channel > LTC2947_TEMP_FAN_CHAN) {
+		dev_err(st->dev, "Invalid chan%d for temperature", channel);
+		return -EINVAL;
+	}
+
+	switch (attr) {
+	case hwmon_temp_reset_history:
+		if (val != 1)
+			return -EINVAL;
+		return ltc2947_reset_history(st, LTC2947_REG_TEMP_MAX,
+					     LTC2947_REG_TEMP_MIN);
+	case hwmon_temp_max:
+		val = clamp_val(val, TEMP_MIN, TEMP_MAX);
+		if (channel == LTC2947_TEMP_FAN_CHAN) {
+			if (!st->gpio_out)
+				return -ENOTSUPP;
+
+			return ltc2947_val_write(st,
+					LTC2947_REG_TEMP_FAN_THRE_H,
+					LTC2947_PAGE1, 2,
+					DIV_ROUND_CLOSEST(val - 550, 204));
+		}
+
+		return ltc2947_val_write(st, LTC2947_REG_TEMP_THRE_H,
+					 LTC2947_PAGE1, 2,
+					 DIV_ROUND_CLOSEST(val - 550, 204));
+	case hwmon_temp_min:
+		val = clamp_val(val, TEMP_MIN, TEMP_MAX);
+		if (channel == LTC2947_TEMP_FAN_CHAN) {
+			if (!st->gpio_out)
+				return -ENOTSUPP;
+
+			return ltc2947_val_write(st,
+					LTC2947_REG_TEMP_FAN_THRE_L,
+					LTC2947_PAGE1, 2,
+					DIV_ROUND_CLOSEST(val - 550, 204));
+		}
+
+		return ltc2947_val_write(st, LTC2947_REG_TEMP_THRE_L,
+					 LTC2947_PAGE1, 2,
+					 DIV_ROUND_CLOSEST(val - 550, 204));
+	default:
+		return -ENOTSUPP;
+	}
+}
+
+static int ltc2947_write_power(struct device *dev, const u32 attr,
+			       long val)
+{
+	struct ltc2947_data *st = dev_get_drvdata(dev);
+
+	switch (attr) {
+	case hwmon_power_reset_history:
+		if (val != 1)
+			return -EINVAL;
+		return ltc2947_reset_history(st, LTC2947_REG_POWER_MAX,
+					     LTC2947_REG_POWER_MIN);
+	case hwmon_power_max:
+		val = clamp_val(val, POWER_MIN, POWER_MAX);
+		return ltc2947_val_write(st, LTC2947_REG_POWER_THRE_H,
+					 LTC2947_PAGE1, 2,
+					 DIV_ROUND_CLOSEST(val, 200000));
+	case hwmon_power_min:
+		val = clamp_val(val, POWER_MIN, POWER_MAX);
+		return ltc2947_val_write(st, LTC2947_REG_POWER_THRE_L,
+					 LTC2947_PAGE1, 2,
+					 DIV_ROUND_CLOSEST(val, 200000));
+	default:
+		return -ENOTSUPP;
+	}
+}
+
+static int ltc2947_write_curr(struct device *dev, const u32 attr,
+			      long val)
+{
+	struct ltc2947_data *st = dev_get_drvdata(dev);
+
+	switch (attr) {
+	case hwmon_curr_reset_history:
+		if (val != 1)
+			return -EINVAL;
+		return ltc2947_reset_history(st, LTC2947_REG_CURRENT_MAX,
+					     LTC2947_REG_CURRENT_MIN);
+	case hwmon_curr_max:
+		val = clamp_val(val, CURRENT_MIN, CURRENT_MAX);
+		return ltc2947_val_write(st, LTC2947_REG_CURRENT_THRE_H,
+					 LTC2947_PAGE1, 2,
+					 DIV_ROUND_CLOSEST(val, 12));
+	case hwmon_curr_min:
+		val = clamp_val(val, CURRENT_MIN, CURRENT_MAX);
+		return ltc2947_val_write(st, LTC2947_REG_CURRENT_THRE_L,
+					 LTC2947_PAGE1, 2,
+					 DIV_ROUND_CLOSEST(val, 12));
+	default:
+		return -ENOTSUPP;
+	}
+}
+
+static int ltc2947_write_in(struct device *dev, const u32 attr, long val,
+			    const int channel)
+{
+	struct ltc2947_data *st = dev_get_drvdata(dev);
+
+	if (channel > LTC2947_VOLTAGE_DVCC_CHAN) {
+		dev_err(st->dev, "Invalid chan%d for voltage", channel);
+		return -EINVAL;
+	}
+
+	switch (attr) {
+	case hwmon_in_reset_history:
+		if (val != 1)
+			return -EINVAL;
+
+		if (channel == LTC2947_VOLTAGE_DVCC_CHAN)
+			return ltc2947_reset_history(st, LTC2947_REG_DVCC_MAX,
+						     LTC2947_REG_DVCC_MIN);
+
+		return ltc2947_reset_history(st, LTC2947_REG_VOLTAGE_MAX,
+					     LTC2947_REG_VOLTAGE_MIN);
+	case hwmon_in_max:
+		if (channel == LTC2947_VOLTAGE_DVCC_CHAN) {
+			val = clamp_val(val, VDVCC_MIN, VDVCC_MAX);
+			return ltc2947_val_write(st, LTC2947_REG_DVCC_THRE_H,
+						 LTC2947_PAGE1, 2,
+						 DIV_ROUND_CLOSEST(val, 145));
+		}
+
+		val = clamp_val(val, VOLTAGE_MIN, VOLTAGE_MAX);
+		return ltc2947_val_write(st, LTC2947_REG_VOLTAGE_THRE_H,
+					 LTC2947_PAGE1, 2,
+					 DIV_ROUND_CLOSEST(val, 2));
+	case hwmon_in_min:
+		if (channel == LTC2947_VOLTAGE_DVCC_CHAN) {
+			val = clamp_val(val, VDVCC_MIN, VDVCC_MAX);
+			return ltc2947_val_write(st, LTC2947_REG_DVCC_THRE_L,
+						 LTC2947_PAGE1, 2,
+						 DIV_ROUND_CLOSEST(val, 145));
+		}
+
+		val = clamp_val(val, VOLTAGE_MIN, VOLTAGE_MAX);
+		return ltc2947_val_write(st, LTC2947_REG_VOLTAGE_THRE_L,
+					 LTC2947_PAGE1, 2,
+					 DIV_ROUND_CLOSEST(val, 2));
+	default:
+		return -ENOTSUPP;
+	}
+}
+
+static int ltc2947_write(struct device *dev,
+			 enum hwmon_sensor_types type,
+			 u32 attr, int channel, long val)
+{
+	switch (type) {
+	case hwmon_in:
+		return ltc2947_write_in(dev, attr, val, channel);
+	case hwmon_curr:
+		return ltc2947_write_curr(dev, attr, val);
+	case hwmon_power:
+		return ltc2947_write_power(dev, attr, val);
+	case hwmon_temp:
+		return ltc2947_write_temp(dev, attr, val, channel);
+	default:
+		return -ENOTSUPP;
+	}
+}
+
+static int ltc2947_read_labels(struct device *dev,
+			       enum hwmon_sensor_types type,
+			       u32 attr, int channel, const char **str)
+{
+	switch (type) {
+	case hwmon_in:
+		if (channel == LTC2947_VOLTAGE_DVCC_CHAN)
+			*str = "DVCC";
+		else
+			*str = "VP-VM";
+		return 0;
+	case hwmon_curr:
+		*str = "IP-IM";
+		return 0;
+	case hwmon_temp:
+		if (channel == LTC2947_TEMP_FAN_CHAN)
+			*str = "TEMPFAN";
+		else
+			*str = "Ambient";
+		return 0;
+	case hwmon_power:
+		*str = "Power";
+		return 0;
+	default:
+		return -ENOTSUPP;
+	}
+}
+
+static int ltc2947_in_is_visible(const u32 attr)
+{
+	switch (attr) {
+	case hwmon_in_input:
+	case hwmon_in_highest:
+	case hwmon_in_lowest:
+	case hwmon_in_max_alarm:
+	case hwmon_in_min_alarm:
+	case hwmon_in_label:
+		return 0444;
+	case hwmon_in_reset_history:
+		return 0200;
+	case hwmon_in_max:
+	case hwmon_in_min:
+		return 0644;
+	default:
+		return 0;
+	}
+}
+
+static int ltc2947_curr_is_visible(const u32 attr)
+{
+	switch (attr) {
+	case hwmon_curr_input:
+	case hwmon_curr_highest:
+	case hwmon_curr_lowest:
+	case hwmon_curr_max_alarm:
+	case hwmon_curr_min_alarm:
+	case hwmon_curr_label:
+		return 0444;
+	case hwmon_curr_reset_history:
+		return 0200;
+	case hwmon_curr_max:
+	case hwmon_curr_min:
+		return 0644;
+	default:
+		return 0;
+	}
+}
+
+static int ltc2947_power_is_visible(const u32 attr)
+{
+	switch (attr) {
+	case hwmon_power_input:
+	case hwmon_power_input_highest:
+	case hwmon_power_input_lowest:
+	case hwmon_power_label:
+	case hwmon_power_max_alarm:
+	case hwmon_power_min_alarm:
+		return 0444;
+	case hwmon_power_reset_history:
+		return 0200;
+	case hwmon_power_max:
+	case hwmon_power_min:
+		return 0644;
+	default:
+		return 0;
+	}
+}
+
+static int ltc2947_temp_is_visible(const u32 attr)
+{
+	switch (attr) {
+	case hwmon_temp_input:
+	case hwmon_temp_highest:
+	case hwmon_temp_lowest:
+	case hwmon_temp_max_alarm:
+	case hwmon_temp_min_alarm:
+	case hwmon_temp_label:
+		return 0444;
+	case hwmon_temp_reset_history:
+		return 0200;
+	case hwmon_temp_max:
+	case hwmon_temp_min:
+		return 0644;
+	default:
+		return 0;
+	}
+}
+
+static umode_t ltc2947_is_visible(const void *data,
+				  enum hwmon_sensor_types type,
+				  u32 attr, int channel)
+{
+	switch (type) {
+	case hwmon_in:
+		return ltc2947_in_is_visible(attr);
+	case hwmon_curr:
+		return ltc2947_curr_is_visible(attr);
+	case hwmon_power:
+		return ltc2947_power_is_visible(attr);
+	case hwmon_temp:
+		return ltc2947_temp_is_visible(attr);
+	default:
+		return 0;
+	}
+}
+
+static const struct hwmon_channel_info *ltc2947_info[] = {
+	HWMON_CHANNEL_INFO(in,
+			   HWMON_I_INPUT | HWMON_I_LOWEST | HWMON_I_HIGHEST |
+			   HWMON_I_MAX | HWMON_I_MIN | HWMON_I_RESET_HISTORY |
+			   HWMON_I_MIN_ALARM | HWMON_I_MAX_ALARM |
+			   HWMON_I_LABEL,
+			   HWMON_I_INPUT | HWMON_I_LOWEST | HWMON_I_HIGHEST |
+			   HWMON_I_MAX | HWMON_I_MIN | HWMON_I_RESET_HISTORY |
+			   HWMON_I_MIN_ALARM | HWMON_I_MAX_ALARM |
+			   HWMON_I_LABEL),
+	HWMON_CHANNEL_INFO(curr,
+			   HWMON_C_INPUT | HWMON_C_LOWEST | HWMON_C_HIGHEST |
+			   HWMON_C_MAX | HWMON_C_MIN | HWMON_C_RESET_HISTORY |
+			   HWMON_C_MIN_ALARM | HWMON_C_MAX_ALARM |
+			   HWMON_C_LABEL),
+	HWMON_CHANNEL_INFO(power,
+			   HWMON_P_INPUT | HWMON_P_INPUT_LOWEST |
+			   HWMON_P_INPUT_HIGHEST | HWMON_P_MAX | HWMON_P_MIN |
+			   HWMON_P_RESET_HISTORY | HWMON_P_MAX_ALARM |
+			   HWMON_P_MIN_ALARM | HWMON_P_LABEL),
+	HWMON_CHANNEL_INFO(temp,
+			   HWMON_T_INPUT | HWMON_T_LOWEST | HWMON_T_HIGHEST |
+			   HWMON_T_MAX | HWMON_T_MIN | HWMON_T_RESET_HISTORY |
+			   HWMON_T_MIN_ALARM | HWMON_T_MAX_ALARM |
+			   HWMON_T_LABEL,
+			   HWMON_T_MAX_ALARM | HWMON_T_MIN_ALARM | HWMON_T_MAX |
+			   HWMON_T_MIN | HWMON_T_LABEL),
+	NULL
+};
+
+static const struct hwmon_ops ltc2947_hwmon_ops = {
+	.is_visible = ltc2947_is_visible,
+	.read = ltc2947_read,
+	.write = ltc2947_write,
+	.read_string = ltc2947_read_labels,
+};
+
+static const struct hwmon_chip_info ltc2947_chip_info = {
+	.ops = &ltc2947_hwmon_ops,
+	.info = ltc2947_info,
+};
+
+/* energy attributes are 6bytes wide so we need u64 */
+static SENSOR_DEVICE_ATTR(energy1_input, 0444, ltc2947_show_value, NULL,
+			  LTC2947_REG_ENERGY1);
+static SENSOR_DEVICE_ATTR(energy2_input, 0444, ltc2947_show_value, NULL,
+			  LTC2947_REG_ENERGY2);
+
+static struct attribute *ltc2947_attrs[] = {
+	&sensor_dev_attr_energy1_input.dev_attr.attr,
+	&sensor_dev_attr_energy2_input.dev_attr.attr,
+	NULL,
+};
+ATTRIBUTE_GROUPS(ltc2947);
+
+static void ltc2947_clk_disable(void *data)
+{
+	struct clk *extclk = data;
+
+	clk_disable_unprepare(extclk);
+}
+
+static int ltc2947_setup(struct ltc2947_data *st)
+{
+	int ret;
+	struct clk *extclk;
+	u32 dummy, deadband, pol;
+	u32 accum[2];
+
+	/* clear status register by reading it */
+	ret = regmap_read(st->map, LTC2947_REG_STATUS, &dummy);
+	if (ret)
+		return ret;
+	/*
+	 * Set max/min for power here since the default values x scale
+	 * would overflow on 32bit arch
+	 */
+	ret = ltc2947_val_write(st, LTC2947_REG_POWER_THRE_H, LTC2947_PAGE1, 2,
+				POWER_MAX / 200000);
+	if (ret)
+		return ret;
+
+	ret = ltc2947_val_write(st, LTC2947_REG_POWER_THRE_L, LTC2947_PAGE1, 2,
+				POWER_MIN / 200000);
+	if (ret)
+		return ret;
+
+	/* check external clock presence */
+	extclk = devm_clk_get(st->dev, NULL);
+	if (!IS_ERR(extclk)) {
+		unsigned long rate_hz;
+		u8 pre = 0, div, tbctl;
+		u64 aux;
+
+		/* let's calculate and set the right valus in TBCTL */
+		rate_hz = clk_get_rate(extclk);
+		if (rate_hz < LTC2947_CLK_MIN || rate_hz > LTC2947_CLK_MAX) {
+			dev_err(st->dev, "Invalid rate:%lu for external clock",
+				rate_hz);
+			return -EINVAL;
+		}
+
+		ret = clk_prepare_enable(extclk);
+		if (ret)
+			return ret;
+
+		ret = devm_add_action_or_reset(st->dev, ltc2947_clk_disable,
+					       extclk);
+		if (ret)
+			return ret;
+		/* as in table 1 of the datasheet */
+		if (rate_hz >= LTC2947_CLK_MIN && rate_hz <= 1000000)
+			pre = 0;
+		else if (rate_hz > 1000000 && rate_hz <= 2000000)
+			pre = 1;
+		else if (rate_hz > 2000000 && rate_hz <= 4000000)
+			pre = 2;
+		else if (rate_hz > 4000000 && rate_hz <= 8000000)
+			pre = 3;
+		else if (rate_hz > 8000000 && rate_hz <= 16000000)
+			pre = 4;
+		else if (rate_hz > 16000000 && rate_hz <= LTC2947_CLK_MAX)
+			pre = 5;
+		/*
+		 * Div is given by:
+		 *	floor(fref / (2^PRE * 32768))
+		 */
+		div = rate_hz / ((1 << pre) * 32768);
+		tbctl = LTC2947_PRE(pre) | LTC2947_DIV(div);
+
+		ret = regmap_write(st->map, LTC2947_REG_TBCTL, tbctl);
+		if (ret)
+			return ret;
+		/*
+		 * The energy lsb is given by (in W*s):
+		 *      06416 * (1/fref) * 2^PRE * (DIV + 1)
+		 * The value is multiplied by 10E9
+		 */
+		aux = (div + 1) * ((1 << pre) * 641600000ULL);
+		st->lsb_energy = DIV_ROUND_CLOSEST_ULL(aux, rate_hz);
+	} else {
+		/* 19.89E-6 * 10E9 */
+		st->lsb_energy = 19890;
+	}
+	ret = of_property_read_u32_array(st->dev->of_node,
+					 "adi,accumulator-ctl-pol", accum,
+					  ARRAY_SIZE(accum));
+	if (!ret) {
+		u32 accum_reg = LTC2947_ACCUM_POL_1(accum[0]) |
+				LTC2947_ACCUM_POL_2(accum[1]);
+
+		ret = regmap_write(st->map, LTC2947_REG_ACCUM_POL, accum_reg);
+		if (ret)
+			return ret;
+	}
+	ret = of_property_read_u32(st->dev->of_node,
+				   "adi,accumulation-deadband-microamp",
+				   &deadband);
+	if (!ret) {
+		/* the LSB is the same as the current, so 3mA */
+		ret = regmap_write(st->map, LTC2947_REG_ACCUM_DEADBAND,
+				   deadband / (1000 * 3));
+		if (ret)
+			return ret;
+	}
+	/* check gpio cfg */
+	ret = of_property_read_u32(st->dev->of_node, "adi,gpio-out-pol", &pol);
+	if (!ret) {
+		/* setup GPIO as output */
+		u32 gpio_ctl = LTC2947_GPIO_EN(1) | LTC2947_GPIO_FAN_EN(1) |
+			LTC2947_GPIO_FAN_POL(pol);
+
+		st->gpio_out = true;
+		ret = regmap_write(st->map, LTC2947_REG_GPIOSTATCTL, gpio_ctl);
+		if (ret)
+			return ret;
+	}
+	ret = of_property_read_u32_array(st->dev->of_node, "adi,gpio-in-accum",
+					 accum, ARRAY_SIZE(accum));
+	if (!ret) {
+		/*
+		 * Setup the accum options. The gpioctl is already defined as
+		 * input by default.
+		 */
+		u32 accum_val = LTC2947_ACCUM_POL_1(accum[0]) |
+				LTC2947_ACCUM_POL_2(accum[1]);
+
+		if (st->gpio_out) {
+			dev_err(st->dev,
+				"Cannot have input gpio config if already configured as output");
+			return -EINVAL;
+		}
+
+		ret = regmap_write(st->map, LTC2947_REG_GPIO_ACCUM, accum_val);
+		if (ret)
+			return ret;
+	}
+
+	/* set continuos mode */
+	return regmap_update_bits(st->map, LTC2947_REG_CTRL,
+				  LTC2947_CONT_MODE_MASK, LTC2947_CONT_MODE(1));
+}
+
+int ltc2947_core_probe(struct regmap *map, const char *name)
+{
+	struct ltc2947_data *st;
+	struct device *dev = regmap_get_device(map);
+	struct device *hwmon;
+	int ret;
+
+	st = devm_kzalloc(dev, sizeof(*st), GFP_KERNEL);
+	if (!st)
+		return -ENOMEM;
+
+	st->map = map;
+	st->dev = dev;
+	dev_set_drvdata(dev, st);
+	mutex_init(&st->lock);
+
+	ret = ltc2947_setup(st);
+	if (ret)
+		return ret;
+
+	hwmon = devm_hwmon_device_register_with_info(dev, name, st,
+						     &ltc2947_chip_info,
+						     ltc2947_groups);
+	return PTR_ERR_OR_ZERO(hwmon);
+}
+EXPORT_SYMBOL_GPL(ltc2947_core_probe);
+
+static int __maybe_unused ltc2947_resume(struct device *dev)
+{
+	struct ltc2947_data *st = dev_get_drvdata(dev);
+	u32 ctrl = 0;
+	int ret;
+
+	/* dummy read to wake the device */
+	ret = regmap_read(st->map, LTC2947_REG_CTRL, &ctrl);
+	if (ret)
+		return ret;
+	/*
+	 * Wait for the device. It takes 100ms to wake up so, 10ms extra
+	 * should be enough.
+	 */
+	msleep(110);
+	ret = regmap_read(st->map, LTC2947_REG_CTRL, &ctrl);
+	if (ret)
+		return ret;
+	/* ctrl should be 0 */
+	if (ctrl != 0) {
+		dev_err(st->dev, "Device failed to wake up, ctl:%02X\n", ctrl);
+		return -ETIMEDOUT;
+	}
+
+	/* set continuous mode */
+	return regmap_update_bits(st->map, LTC2947_REG_CTRL,
+				  LTC2947_CONT_MODE_MASK, LTC2947_CONT_MODE(1));
+}
+
+static int __maybe_unused ltc2947_suspend(struct device *dev)
+{
+	struct ltc2947_data *st = dev_get_drvdata(dev);
+
+	return regmap_update_bits(st->map, LTC2947_REG_CTRL,
+				  LTC2947_SHUTDOWN_MASK, 1);
+}
+
+SIMPLE_DEV_PM_OPS(ltc2947_pm_ops, ltc2947_suspend, ltc2947_resume);
+EXPORT_SYMBOL_GPL(ltc2947_pm_ops);
+
+const struct of_device_id ltc2947_of_match[] = {
+	{ .compatible = "adi,ltc2947" },
+	{}
+};
+EXPORT_SYMBOL_GPL(ltc2947_of_match);
+MODULE_DEVICE_TABLE(of, ltc2947_of_match);
+
+MODULE_AUTHOR("Nuno Sa <nuno.sa@analog.com>");
+MODULE_DESCRIPTION("LTC2947 power and energy monitor core driver");
+MODULE_LICENSE("GPL");

drivers/hwmon/ltc2947-i2c.c

+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Analog Devices LTC2947 high precision power and energy monitor over I2C
+ *
+ * Copyright 2019 Analog Devices Inc.
+ */
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+
+#include "ltc2947.h"
+
+static const struct regmap_config ltc2947_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+};
+
+static int ltc2947_probe(struct i2c_client *i2c,
+			 const struct i2c_device_id *id)
+{
+	struct regmap *map;
+
+	map = devm_regmap_init_i2c(i2c, &ltc2947_regmap_config);
+	if (IS_ERR(map))
+		return PTR_ERR(map);
+
+	return ltc2947_core_probe(map, i2c->name);
+}
+
+static const struct i2c_device_id ltc2947_id[] = {
+	{"ltc2947", 0},
+	{}
+};
+MODULE_DEVICE_TABLE(i2c, ltc2947_id);
+
+static struct i2c_driver ltc2947_driver = {
+	.driver = {
+		.name = "ltc2947",
+		.of_match_table = ltc2947_of_match,
+		.pm = &ltc2947_pm_ops,
+	},
+	.probe = ltc2947_probe,
+	.id_table = ltc2947_id,
+};
+module_i2c_driver(ltc2947_driver);
+
+MODULE_AUTHOR("Nuno Sa <nuno.sa@analog.com>");
+MODULE_DESCRIPTION("LTC2947 I2C power and energy monitor driver");
+MODULE_LICENSE("GPL");

drivers/hwmon/ltc2947-spi.c

+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Analog Devices LTC2947 high precision power and energy monitor over SPI
+ *
+ * Copyright 2019 Analog Devices Inc.
+ */
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/regmap.h>
+#include <linux/spi/spi.h>
+
+#include "ltc2947.h"
+
+static const struct regmap_config ltc2947_regmap_config = {
+	.reg_bits = 16,
+	.val_bits = 8,
+	.read_flag_mask = BIT(0),
+};
+
+static int ltc2947_probe(struct spi_device *spi)
+{
+	struct regmap *map;
+
+	map = devm_regmap_init_spi(spi, &ltc2947_regmap_config);
+	if (IS_ERR(map))
+		return PTR_ERR(map);
+
+	return ltc2947_core_probe(map, spi_get_device_id(spi)->name);
+}
+
+static const struct spi_device_id ltc2947_id[] = {
+	{"ltc2947", 0},
+	{}
+};
+MODULE_DEVICE_TABLE(spi, ltc2947_id);
+
+static struct spi_driver ltc2947_driver = {
+	.driver = {
+		.name = "ltc2947",
+		.of_match_table = ltc2947_of_match,
+		.pm = &ltc2947_pm_ops,
+	},
+	.probe = ltc2947_probe,
+	.id_table = ltc2947_id,
+};
+module_spi_driver(ltc2947_driver);
+
+MODULE_AUTHOR("Nuno Sa <nuno.sa@analog.com>");
+MODULE_DESCRIPTION("LTC2947 SPI power and energy monitor driver");
+MODULE_LICENSE("GPL");

drivers/hwmon/ltc2947.h

+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_LTC2947_H
+#define _LINUX_LTC2947_H
+
+struct regmap;
+
+extern const struct of_device_id ltc2947_of_match[];
+extern const struct dev_pm_ops ltc2947_pm_ops;
+
+int ltc2947_core_probe(struct regmap *map, const char *name);
+
+#endif

drivers/hwmon/pmbus/Kconfig

@@ -36,6 +36,15 @@ config SENSORS_ADM1275
 	  This driver can also be built as a module. If so, the module will
 	  be called adm1275.
 
+config SENSORS_BEL_PFE
+	tristate "Bel PFE Compatible Power Supplies"
+	help
+	  If you say yes here you get hardware monitoring support for BEL
+	  PFE1100 and PFE3000 Power Supplies.
+
+	  This driver can also be built as a module. If so, the module will
+	  be called bel-pfe.
+
 config SENSORS_IBM_CFFPS
 	tristate "IBM Common Form Factor Power Supply"
 	depends on LEDS_CLASS

drivers/hwmon/pmbus/Makefile

@@ -6,6 +6,7 @@
 obj-$(CONFIG_PMBUS)		+= pmbus_core.o
 obj-$(CONFIG_SENSORS_PMBUS)	+= pmbus.o
 obj-$(CONFIG_SENSORS_ADM1275)	+= adm1275.o
+obj-$(CONFIG_SENSORS_BEL_PFE)	+= bel-pfe.o
 obj-$(CONFIG_SENSORS_IBM_CFFPS)	+= ibm-cffps.o
 obj-$(CONFIG_SENSORS_INSPUR_IPSPS) += inspur-ipsps.o
 obj-$(CONFIG_SENSORS_IR35221)	+= ir35221.o

drivers/hwmon/pmbus/bel-pfe.c

+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Hardware monitoring driver for BEL PFE family power supplies.
+ *
+ * Copyright (c) 2019 Facebook Inc.
+ */
+
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pmbus.h>
+
+#include "pmbus.h"
+
+enum chips {pfe1100, pfe3000};
+
+/*
+ * Disable status check for pfe3000 devices, because some devices report
+ * communication error (invalid command) for VOUT_MODE command (0x20)
+ * although correct VOUT_MODE (0x16) is returned: it leads to incorrect
+ * exponent in linear mode.
+ */
+static struct pmbus_platform_data pfe3000_plat_data = {
+	.flags = PMBUS_SKIP_STATUS_CHECK,
+};
+
+static struct pmbus_driver_info pfe_driver_info[] = {
+	[pfe1100] = {
+		.pages = 1,
+		.format[PSC_VOLTAGE_IN] = linear,
+		.format[PSC_VOLTAGE_OUT] = linear,
+		.format[PSC_CURRENT_IN] = linear,
+		.format[PSC_CURRENT_OUT] = linear,
+		.format[PSC_POWER] = linear,
+		.format[PSC_TEMPERATURE] = linear,
+		.format[PSC_FAN] = linear,
+
+		.func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
+			   PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
+			   PMBUS_HAVE_POUT |
+			   PMBUS_HAVE_VIN | PMBUS_HAVE_IIN |
+			   PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT |
+			   PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 |
+			   PMBUS_HAVE_STATUS_TEMP |
+			   PMBUS_HAVE_FAN12,
+	},
+
+	[pfe3000] = {
+		.pages = 7,
+		.format[PSC_VOLTAGE_IN] = linear,
+		.format[PSC_VOLTAGE_OUT] = linear,
+		.format[PSC_CURRENT_IN] = linear,
+		.format[PSC_CURRENT_OUT] = linear,
+		.format[PSC_POWER] = linear,
+		.format[PSC_TEMPERATURE] = linear,
+		.format[PSC_FAN] = linear,
+
+		/* Page 0: V1. */
+		.func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
+			   PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
+			   PMBUS_HAVE_POUT | PMBUS_HAVE_FAN12 |
+			   PMBUS_HAVE_VIN | PMBUS_HAVE_IIN |
+			   PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT |
+			   PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 |
+			   PMBUS_HAVE_TEMP3 | PMBUS_HAVE_STATUS_TEMP |
+			   PMBUS_HAVE_VCAP,
+
+		/* Page 1: Vsb. */
+		.func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
+			   PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
+			   PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT |
+			   PMBUS_HAVE_POUT,
+
+		/*
+		 * Page 2: V1 Ishare.
+		 * Page 3: Reserved.
+		 * Page 4: V1 Cathode.
+		 * Page 5: Vsb Cathode.
+		 * Page 6: V1 Sense.
+		 */
+		.func[2] = PMBUS_HAVE_VOUT,
+		.func[4] = PMBUS_HAVE_VOUT,
+		.func[5] = PMBUS_HAVE_VOUT,
+		.func[6] = PMBUS_HAVE_VOUT,
+	},
+};
+
+static int pfe_pmbus_probe(struct i2c_client *client,
+			   const struct i2c_device_id *id)
+{
+	int model;
+
+	model = (int)id->driver_data;
+
+	/*
+	 * PFE3000-12-069RA devices may not stay in page 0 during device
+	 * probe which leads to probe failure (read status word failed).
+	 * So let's set the device to page 0 at the beginning.
+	 */
+	if (model == pfe3000) {
+		client->dev.platform_data = &pfe3000_plat_data;
+		i2c_smbus_write_byte_data(client, PMBUS_PAGE, 0);
+	}
+
+	return pmbus_do_probe(client, id, &pfe_driver_info[model]);
+}
+
+static const struct i2c_device_id pfe_device_id[] = {
+	{"pfe1100", pfe1100},
+	{"pfe3000", pfe3000},
+	{}
+};
+
+MODULE_DEVICE_TABLE(i2c, pfe_device_id);
+
+static struct i2c_driver pfe_pmbus_driver = {
+	.driver = {
+		   .name = "bel-pfe",
+	},
+	.probe = pfe_pmbus_probe,
+	.remove = pmbus_do_remove,
+	.id_table = pfe_device_id,
+};
+
+module_i2c_driver(pfe_pmbus_driver);
+
+MODULE_AUTHOR("Tao Ren <rentao.bupt@gmail.com>");
+MODULE_DESCRIPTION("PMBus driver for BEL PFE Family Power Supplies");
+MODULE_LICENSE("GPL");

drivers/hwmon/pmbus/ibm-cffps.c

@@ -3,6 +3,7 @@
  * Copyright 2017 IBM Corp.
  */
 
+#include <linux/bitfield.h>
 #include <linux/bitops.h>
 #include <linux/debugfs.h>
 #include <linux/device.h>
@@ -29,6 +30,10 @@
 #define CFFPS_INPUT_HISTORY_CMD			0xD6
 #define CFFPS_INPUT_HISTORY_SIZE		100
 
+#define CFFPS_CCIN_VERSION			GENMASK(15, 8)
+#define CFFPS_CCIN_VERSION_1			 0x2b
+#define CFFPS_CCIN_VERSION_2			 0x2e
+
 /* STATUS_MFR_SPECIFIC bits */
 #define CFFPS_MFR_FAN_FAULT			BIT(0)
 #define CFFPS_MFR_THERMAL_FAULT			BIT(1)
@@ -39,9 +44,13 @@
 #define CFFPS_MFR_VAUX_FAULT			BIT(6)
 #define CFFPS_MFR_CURRENT_SHARE_WARNING		BIT(7)
 
+/*
+ * LED off state actually relinquishes LED control to PSU firmware, so it can
+ * turn on the LED for faults.
+ */
+#define CFFPS_LED_OFF				0
 #define CFFPS_LED_BLINK				BIT(0)
 #define CFFPS_LED_ON				BIT(1)
-#define CFFPS_LED_OFF				BIT(2)
 #define CFFPS_BLINK_RATE_MS			250
 
 enum {
@@ -54,7 +63,7 @@ enum {
 	CFFPS_DEBUGFS_NUM_ENTRIES
 };
 
-enum versions { cffps1, cffps2 };
+enum versions { cffps1, cffps2, cffps_unknown };
 
 struct ibm_cffps_input_history {
 	struct mutex update_lock;
@@ -292,28 +301,38 @@ static int ibm_cffps_read_word_data(struct i2c_client *client, int page,
 	return rc;
 }
 
-static void ibm_cffps_led_brightness_set(struct led_classdev *led_cdev,
-					 enum led_brightness brightness)
+static int ibm_cffps_led_brightness_set(struct led_classdev *led_cdev,
+					enum led_brightness brightness)
 {
 	int rc;
+	u8 next_led_state;
 	struct ibm_cffps *psu = container_of(led_cdev, struct ibm_cffps, led);
 
 	if (brightness == LED_OFF) {
-		psu->led_state = CFFPS_LED_OFF;
+		next_led_state = CFFPS_LED_OFF;
 	} else {
 		brightness = LED_FULL;
+
 		if (psu->led_state != CFFPS_LED_BLINK)
-			psu->led_state = CFFPS_LED_ON;
+			next_led_state = CFFPS_LED_ON;
+		else
+			next_led_state = CFFPS_LED_BLINK;
 	}
 
+	dev_dbg(&psu->client->dev, "LED brightness set: %d. Command: %d.\n",
+		brightness, next_led_state);
+
 	pmbus_set_page(psu->client, 0);
 
 	rc = i2c_smbus_write_byte_data(psu->client, CFFPS_SYS_CONFIG_CMD,
-				       psu->led_state);
+				       next_led_state);
 	if (rc < 0)
-		return;
+		return rc;
 
+	psu->led_state = next_led_state;
 	led_cdev->brightness = brightness;
+
+	return 0;
 }
 
 static int ibm_cffps_led_blink_set(struct led_classdev *led_cdev,
@@ -323,10 +342,7 @@ static int ibm_cffps_led_blink_set(struct led_classdev *led_cdev,
 	int rc;
 	struct ibm_cffps *psu = container_of(led_cdev, struct ibm_cffps, led);
 
-	psu->led_state = CFFPS_LED_BLINK;
-
-	if (led_cdev->brightness == LED_OFF)
-		return 0;
+	dev_dbg(&psu->client->dev, "LED blink set.\n");
 
 	pmbus_set_page(psu->client, 0);
 
@@ -335,6 +351,8 @@ static int ibm_cffps_led_blink_set(struct led_classdev *led_cdev,
 	if (rc < 0)
 		return rc;
 
+	psu->led_state = CFFPS_LED_BLINK;
+	led_cdev->brightness = LED_FULL;
 	*delay_on = CFFPS_BLINK_RATE_MS;
 	*delay_off = CFFPS_BLINK_RATE_MS;
 
@@ -351,7 +369,7 @@ static void ibm_cffps_create_led_class(struct ibm_cffps *psu)
 		 client->addr);
 	psu->led.name = psu->led_name;
 	psu->led.max_brightness = LED_FULL;
-	psu->led.brightness_set = ibm_cffps_led_brightness_set;
+	psu->led.brightness_set_blocking = ibm_cffps_led_brightness_set;
 	psu->led.blink_set = ibm_cffps_led_blink_set;
 
 	rc = devm_led_classdev_register(dev, &psu->led);
@@ -395,7 +413,7 @@ static int ibm_cffps_probe(struct i2c_client *client,
 			   const struct i2c_device_id *id)
 {
 	int i, rc;
-	enum versions vs;
+	enum versions vs = cffps_unknown;
 	struct dentry *debugfs;
 	struct dentry *ibm_cffps_dir;
 	struct ibm_cffps *psu;
@@ -405,8 +423,27 @@ static int ibm_cffps_probe(struct i2c_client *client,
 		vs = (enum versions)md;
 	else if (id)
 		vs = (enum versions)id->driver_data;
-	else
-		vs = cffps1;
+
+	if (vs == cffps_unknown) {
+		u16 ccin_version = CFFPS_CCIN_VERSION_1;
+		int ccin = i2c_smbus_read_word_swapped(client, CFFPS_CCIN_CMD);
+
+		if (ccin > 0)
+			ccin_version = FIELD_GET(CFFPS_CCIN_VERSION, ccin);
+
+		switch (ccin_version) {
+		default:
+		case CFFPS_CCIN_VERSION_1:
+			vs = cffps1;
+			break;
+		case CFFPS_CCIN_VERSION_2:
+			vs = cffps2;
+			break;
+		}
+
+		/* Set the client name to include the version number. */
+		snprintf(client->name, I2C_NAME_SIZE, "cffps%d", vs + 1);
+	}
 
 	client->dev.platform_data = &ibm_cffps_pdata;
 	rc = pmbus_do_probe(client, id, &ibm_cffps_info[vs]);
@@ -465,6 +502,7 @@ static int ibm_cffps_probe(struct i2c_client *client,
 static const struct i2c_device_id ibm_cffps_id[] = {
 	{ "ibm_cffps1", cffps1 },
 	{ "ibm_cffps2", cffps2 },
+	{ "ibm_cffps", cffps_unknown },
 	{}
 };
 MODULE_DEVICE_TABLE(i2c, ibm_cffps_id);
@@ -478,6 +516,10 @@ static const struct of_device_id ibm_cffps_of_match[] = {
 		.compatible = "ibm,cffps2",
 		.data = (void *)cffps2
 	},
+	{
+		.compatible = "ibm,cffps",
+		.data = (void *)cffps_unknown
+	},
 	{}
 };
 MODULE_DEVICE_TABLE(of, ibm_cffps_of_match);

drivers/hwmon/tmp421.c

@@ -127,7 +127,8 @@ static struct tmp421_data *tmp421_update_device(struct device *dev)
 
 	mutex_lock(&data->update_lock);
 
-	if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
+	if (time_after(jiffies, data->last_updated + (HZ / 2)) ||
+	    !data->valid) {
 		data->config = i2c_smbus_read_byte_data(client,
 			TMP421_CONFIG_REG_1);
 

drivers/hwmon/tmp513.c

+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Driver for Texas Instruments TMP512, TMP513 power monitor chips
+ *
+ * TMP513:
+ * Thermal/Power Management with Triple Remote and
+ * Local Temperature Sensor and Current Shunt Monitor
+ * Datasheet: http://www.ti.com/lit/gpn/tmp513
+ *
+ * TMP512:
+ * Thermal/Power Management with Dual Remote
+ *	and Local Temperature Sensor and Current Shunt Monitor
+ * Datasheet: http://www.ti.com/lit/gpn/tmp512
+ *
+ * Copyright (C) 2019 Eric Tremblay <etremblay@distech-controls.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ */
+
+#include <linux/err.h>
+#include <linux/hwmon.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include <linux/util_macros.h>
+
+// Common register definition
+#define TMP51X_SHUNT_CONFIG		0x00
+#define TMP51X_TEMP_CONFIG		0x01
+#define TMP51X_STATUS			0x02
+#define TMP51X_SMBUS_ALERT		0x03
+#define TMP51X_SHUNT_CURRENT_RESULT	0x04
+#define TMP51X_BUS_VOLTAGE_RESULT	0x05
+#define TMP51X_POWER_RESULT		0x06
+#define TMP51X_BUS_CURRENT_RESULT	0x07
+#define TMP51X_LOCAL_TEMP_RESULT	0x08
+#define TMP51X_REMOTE_TEMP_RESULT_1	0x09
+#define TMP51X_REMOTE_TEMP_RESULT_2	0x0A
+#define TMP51X_SHUNT_CURRENT_H_LIMIT	0x0C
+#define TMP51X_SHUNT_CURRENT_L_LIMIT	0x0D
+#define TMP51X_BUS_VOLTAGE_H_LIMIT	0x0E
+#define TMP51X_BUS_VOLTAGE_L_LIMIT	0x0F
+#define TMP51X_POWER_LIMIT		0x10
+#define TMP51X_LOCAL_TEMP_LIMIT	0x11
+#define TMP51X_REMOTE_TEMP_LIMIT_1	0x12
+#define TMP51X_REMOTE_TEMP_LIMIT_2	0x13
+#define TMP51X_SHUNT_CALIBRATION	0x15
+#define TMP51X_N_FACTOR_AND_HYST_1	0x16
+#define TMP51X_N_FACTOR_2		0x17
+#define TMP51X_MAN_ID_REG		0xFE
+#define TMP51X_DEVICE_ID_REG		0xFF
+
+// TMP513 specific register definition
+#define TMP513_REMOTE_TEMP_RESULT_3	0x0B
+#define TMP513_REMOTE_TEMP_LIMIT_3	0x14
+#define TMP513_N_FACTOR_3		0x18
+
+// Common attrs, and NULL
+#define TMP51X_MANUFACTURER_ID		0x55FF
+
+#define TMP512_DEVICE_ID		0x22FF
+#define TMP513_DEVICE_ID		0x23FF
+
+// Default config
+#define TMP51X_SHUNT_CONFIG_DEFAULT	0x399F
+#define TMP51X_SHUNT_VALUE_DEFAULT	1000
+#define TMP51X_VBUS_RANGE_DEFAULT	TMP51X_VBUS_RANGE_32V
+#define TMP51X_PGA_DEFAULT		8
+#define TMP51X_MAX_REGISTER_ADDR	0xFF
+
+#define TMP512_TEMP_CONFIG_DEFAULT	0xBF80
+#define TMP513_TEMP_CONFIG_DEFAULT	0xFF80
+
+// Mask and shift
+#define CURRENT_SENSE_VOLTAGE_320_MASK	0x1800
+#define CURRENT_SENSE_VOLTAGE_160_MASK	0x1000
+#define CURRENT_SENSE_VOLTAGE_80_MASK	0x0800
+#define CURRENT_SENSE_VOLTAGE_40_MASK	0
+
+#define TMP51X_BUS_VOLTAGE_MASK		0x2000
+#define TMP51X_NFACTOR_MASK		0xFF00
+#define TMP51X_HYST_MASK		0x00FF
+
+#define TMP51X_BUS_VOLTAGE_SHIFT	3
+#define TMP51X_TEMP_SHIFT		3
+
+// Alarms
+#define TMP51X_SHUNT_CURRENT_H_LIMIT_POS	15
+#define TMP51X_SHUNT_CURRENT_L_LIMIT_POS	14
+#define TMP51X_BUS_VOLTAGE_H_LIMIT_POS		13
+#define TMP51X_BUS_VOLTAGE_L_LIMIT_POS		12
+#define TMP51X_POWER_LIMIT_POS			11
+#define TMP51X_LOCAL_TEMP_LIMIT_POS		10
+#define TMP51X_REMOTE_TEMP_LIMIT_1_POS		9
+#define TMP51X_REMOTE_TEMP_LIMIT_2_POS		8
+#define TMP513_REMOTE_TEMP_LIMIT_3_POS		7
+
+#define TMP51X_VBUS_RANGE_32V		32000000
+#define TMP51X_VBUS_RANGE_16V		16000000
+
+// Max and Min value
+#define MAX_BUS_VOLTAGE_32_LIMIT	32764
+#define MAX_BUS_VOLTAGE_16_LIMIT	16382
+
+// Max possible value is -256 to +256 but datasheet indicated -40 to 125.
+#define MAX_TEMP_LIMIT			125000
+#define MIN_TEMP_LIMIT			-40000
+
+#define MAX_TEMP_HYST			127500
+
+static const u8 TMP51X_TEMP_INPUT[4] = {
+	TMP51X_LOCAL_TEMP_RESULT,
+	TMP51X_REMOTE_TEMP_RESULT_1,
+	TMP51X_REMOTE_TEMP_RESULT_2,
+	TMP513_REMOTE_TEMP_RESULT_3
+};
+
+static const u8 TMP51X_TEMP_CRIT[4] = {
+	TMP51X_LOCAL_TEMP_LIMIT,
+	TMP51X_REMOTE_TEMP_LIMIT_1,
+	TMP51X_REMOTE_TEMP_LIMIT_2,
+	TMP513_REMOTE_TEMP_LIMIT_3
+};
+
+static const u8 TMP51X_TEMP_CRIT_ALARM[4] = {
+	TMP51X_LOCAL_TEMP_LIMIT_POS,
+	TMP51X_REMOTE_TEMP_LIMIT_1_POS,
+	TMP51X_REMOTE_TEMP_LIMIT_2_POS,
+	TMP513_REMOTE_TEMP_LIMIT_3_POS
+};
+
+static const u8 TMP51X_TEMP_CRIT_HYST[4] = {
+	TMP51X_N_FACTOR_AND_HYST_1,
+	TMP51X_N_FACTOR_AND_HYST_1,
+	TMP51X_N_FACTOR_AND_HYST_1,
+	TMP51X_N_FACTOR_AND_HYST_1
+};
+
+static const u8 TMP51X_CURR_INPUT[2] = {
+	TMP51X_SHUNT_CURRENT_RESULT,
+	TMP51X_BUS_CURRENT_RESULT
+};
+
+static struct regmap_config tmp51x_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 16,
+	.max_register = TMP51X_MAX_REGISTER_ADDR,
+};
+
+enum tmp51x_ids {
+	tmp512, tmp513
+};
+
+struct tmp51x_data {
+	u16 shunt_config;
+	u16 pga_gain;
+	u32 vbus_range_uvolt;
+
+	u16 temp_config;
+	u32 nfactor[3];
+
+	u32 shunt_uohms;
+
+	u32 curr_lsb_ua;
+	u32 pwr_lsb_uw;
+
+	enum tmp51x_ids id;
+	struct regmap *regmap;
+};
+
+// Set the shift based on the gain 8=4, 4=3, 2=2, 1=1
+static inline u8 tmp51x_get_pga_shift(struct tmp51x_data *data)
+{
+	return 5 - ffs(data->pga_gain);
+}
+
+static int tmp51x_get_value(struct tmp51x_data *data, u8 reg, u8 pos,
+			    unsigned int regval, long *val)
+{
+	switch (reg) {
+	case TMP51X_STATUS:
+		*val = (regval >> pos) & 1;
+		break;
+	case TMP51X_SHUNT_CURRENT_RESULT:
+	case TMP51X_SHUNT_CURRENT_H_LIMIT:
+	case TMP51X_SHUNT_CURRENT_L_LIMIT:
+		/*
+		 * The valus is read in voltage in the chip but reported as
+		 * current to the user.
+		 * 2's compliment number shifted by one to four depending
+		 * on the pga gain setting. 1lsb = 10uV
+		 */
+		*val = sign_extend32(regval, 17 - tmp51x_get_pga_shift(data));
+		*val = DIV_ROUND_CLOSEST(*val * 10000, data->shunt_uohms);
+		break;
+	case TMP51X_BUS_VOLTAGE_RESULT:
+	case TMP51X_BUS_VOLTAGE_H_LIMIT:
+	case TMP51X_BUS_VOLTAGE_L_LIMIT:
+		// 1lsb = 4mV
+		*val = (regval >> TMP51X_BUS_VOLTAGE_SHIFT) * 4;
+		break;
+	case TMP51X_POWER_RESULT:
+	case TMP51X_POWER_LIMIT:
+		// Power = (current * BusVoltage) / 5000
+		*val = regval * data->pwr_lsb_uw;
+		break;
+	case TMP51X_BUS_CURRENT_RESULT:
+		// Current = (ShuntVoltage * CalibrationRegister) / 4096
+		*val = sign_extend32(regval, 16) * data->curr_lsb_ua;
+		*val = DIV_ROUND_CLOSEST(*val, 1000);
+		break;
+	case TMP51X_LOCAL_TEMP_RESULT:
+	case TMP51X_REMOTE_TEMP_RESULT_1:
+	case TMP51X_REMOTE_TEMP_RESULT_2:
+	case TMP513_REMOTE_TEMP_RESULT_3:
+	case TMP51X_LOCAL_TEMP_LIMIT:
+	case TMP51X_REMOTE_TEMP_LIMIT_1:
+	case TMP51X_REMOTE_TEMP_LIMIT_2:
+	case TMP513_REMOTE_TEMP_LIMIT_3:
+		// 1lsb = 0.0625 degrees centigrade
+		*val = sign_extend32(regval, 16) >> TMP51X_TEMP_SHIFT;
+		*val = DIV_ROUND_CLOSEST(*val * 625, 10);
+		break;
+	case TMP51X_N_FACTOR_AND_HYST_1:
+		// 1lsb = 0.5 degrees centigrade
+		*val = (regval & TMP51X_HYST_MASK) * 500;
+		break;
+	default:
+		// Programmer goofed
+		WARN_ON_ONCE(1);
+		*val = 0;
+		return -EOPNOTSUPP;
+	}
+
+	return 0;
+}
+
+static int tmp51x_set_value(struct tmp51x_data *data, u8 reg, long val)
+{
+	int regval, max_val;
+	u32 mask = 0;
+
+	switch (reg) {
+	case TMP51X_SHUNT_CURRENT_H_LIMIT:
+	case TMP51X_SHUNT_CURRENT_L_LIMIT:
+		/*
+		 * The user enter current value and we convert it to
+		 * voltage. 1lsb = 10uV
+		 */
+		val = DIV_ROUND_CLOSEST(val * data->shunt_uohms, 10000);
+		max_val = U16_MAX >> tmp51x_get_pga_shift(data);
+		regval = clamp_val(val, -max_val, max_val);
+		break;
+	case TMP51X_BUS_VOLTAGE_H_LIMIT:
+	case TMP51X_BUS_VOLTAGE_L_LIMIT:
+		// 1lsb = 4mV
+		max_val = (data->vbus_range_uvolt == TMP51X_VBUS_RANGE_32V) ?
+			MAX_BUS_VOLTAGE_32_LIMIT : MAX_BUS_VOLTAGE_16_LIMIT;
+
+		val = clamp_val(DIV_ROUND_CLOSEST(val, 4), 0, max_val);
+		regval = val << TMP51X_BUS_VOLTAGE_SHIFT;
+		break;
+	case TMP51X_POWER_LIMIT:
+		regval = clamp_val(DIV_ROUND_CLOSEST(val, data->pwr_lsb_uw), 0,
+				   U16_MAX);
+		break;
+	case TMP51X_LOCAL_TEMP_LIMIT:
+	case TMP51X_REMOTE_TEMP_LIMIT_1:
+	case TMP51X_REMOTE_TEMP_LIMIT_2:
+	case TMP513_REMOTE_TEMP_LIMIT_3:
+		// 1lsb = 0.0625 degrees centigrade
+		val = clamp_val(val, MIN_TEMP_LIMIT, MAX_TEMP_LIMIT);
+		regval = DIV_ROUND_CLOSEST(val * 10, 625) << TMP51X_TEMP_SHIFT;
+		break;
+	case TMP51X_N_FACTOR_AND_HYST_1:
+		// 1lsb = 0.5 degrees centigrade
+		val = clamp_val(val, 0, MAX_TEMP_HYST);
+		regval = DIV_ROUND_CLOSEST(val, 500);
+		mask = TMP51X_HYST_MASK;
+		break;
+	default:
+		// Programmer goofed
+		WARN_ON_ONCE(1);
+		return -EOPNOTSUPP;
+	}
+
+	if (mask == 0)
+		return regmap_write(data->regmap, reg, regval);
+	else
+		return regmap_update_bits(data->regmap, reg, mask, regval);
+}
+
+static u8 tmp51x_get_reg(enum hwmon_sensor_types type, u32 attr, int channel)
+{
+	switch (type) {
+	case hwmon_temp:
+		switch (attr) {
+		case hwmon_temp_input:
+			return TMP51X_TEMP_INPUT[channel];
+		case hwmon_temp_crit_alarm:
+			return TMP51X_STATUS;
+		case hwmon_temp_crit:
+			return TMP51X_TEMP_CRIT[channel];
+		case hwmon_temp_crit_hyst:
+			return TMP51X_TEMP_CRIT_HYST[channel];
+		}
+		break;
+	case hwmon_in:
+		switch (attr) {
+		case hwmon_in_input:
+			return TMP51X_BUS_VOLTAGE_RESULT;
+		case hwmon_in_lcrit_alarm:
+		case hwmon_in_crit_alarm:
+			return TMP51X_STATUS;
+		case hwmon_in_lcrit:
+			return TMP51X_BUS_VOLTAGE_L_LIMIT;
+		case hwmon_in_crit:
+			return TMP51X_BUS_VOLTAGE_H_LIMIT;
+		}
+		break;
+	case hwmon_curr:
+		switch (attr) {
+		case hwmon_curr_input:
+			return TMP51X_CURR_INPUT[channel];
+		case hwmon_curr_lcrit_alarm:
+		case hwmon_curr_crit_alarm:
+			return TMP51X_STATUS;
+		case hwmon_curr_lcrit:
+			return TMP51X_SHUNT_CURRENT_L_LIMIT;
+		case hwmon_curr_crit:
+			return TMP51X_SHUNT_CURRENT_H_LIMIT;
+		}
+		break;
+	case hwmon_power:
+		switch (attr) {
+		case hwmon_power_input:
+			return TMP51X_POWER_RESULT;
+		case hwmon_power_crit_alarm:
+			return TMP51X_STATUS;
+		case hwmon_power_crit:
+			return TMP51X_POWER_LIMIT;
+		}
+		break;
+	default:
+		break;
+	}
+
+	return 0;
+}
+
+static u8 tmp51x_get_status_pos(enum hwmon_sensor_types type, u32 attr,
+				int channel)
+{
+	switch (type) {
+	case hwmon_temp:
+		switch (attr) {
+		case hwmon_temp_crit_alarm:
+			return TMP51X_TEMP_CRIT_ALARM[channel];
+		}
+		break;
+	case hwmon_in:
+		switch (attr) {
+		case hwmon_in_lcrit_alarm:
+			return TMP51X_BUS_VOLTAGE_L_LIMIT_POS;
+		case hwmon_in_crit_alarm:
+			return TMP51X_BUS_VOLTAGE_H_LIMIT_POS;
+		}
+		break;
+	case hwmon_curr:
+		switch (attr) {
+		case hwmon_curr_lcrit_alarm:
+			return TMP51X_SHUNT_CURRENT_L_LIMIT_POS;
+		case hwmon_curr_crit_alarm:
+			return TMP51X_SHUNT_CURRENT_H_LIMIT_POS;
+		}
+		break;
+	case hwmon_power:
+		switch (attr) {
+		case hwmon_power_crit_alarm:
+			return TMP51X_POWER_LIMIT_POS;
+		}
+		break;
+	default:
+		break;
+	}
+
+	return 0;
+}
+
+static int tmp51x_read(struct device *dev, enum hwmon_sensor_types type,
+		       u32 attr, int channel, long *val)
+{
+	struct tmp51x_data *data = dev_get_drvdata(dev);
+	int ret;
+	u32 regval;
+	u8 pos = 0, reg = 0;
+
+	reg = tmp51x_get_reg(type, attr, channel);
+	if (reg == 0)
+		return -EOPNOTSUPP;
+
+	if (reg == TMP51X_STATUS)
+		pos = tmp51x_get_status_pos(type, attr, channel);
+
+	ret = regmap_read(data->regmap, reg, &regval);
+	if (ret < 0)
+		return ret;
+
+	return tmp51x_get_value(data, reg, pos, regval, val);
+}
+
+static int tmp51x_write(struct device *dev, enum hwmon_sensor_types type,
+			u32 attr, int channel, long val)
+{
+	u8 reg = 0;
+
+	reg = tmp51x_get_reg(type, attr, channel);
+	if (reg == 0)
+		return -EOPNOTSUPP;
+
+	return tmp51x_set_value(dev_get_drvdata(dev), reg, val);
+}
+
+static umode_t tmp51x_is_visible(const void *_data,
+				 enum hwmon_sensor_types type, u32 attr,
+				 int channel)
+{
+	const struct tmp51x_data *data = _data;
+
+	switch (type) {
+	case hwmon_temp:
+		if (data->id == tmp512 && channel == 4)
+			return 0;
+		switch (attr) {
+		case hwmon_temp_input:
+		case hwmon_temp_crit_alarm:
+			return 0444;
+		case hwmon_temp_crit:
+			return 0644;
+		case hwmon_temp_crit_hyst:
+			if (channel == 0)
+				return 0644;
+			return 0444;
+		}
+		break;
+	case hwmon_in:
+		switch (attr) {
+		case hwmon_in_input:
+		case hwmon_in_lcrit_alarm:
+		case hwmon_in_crit_alarm:
+			return 0444;
+		case hwmon_in_lcrit:
+		case hwmon_in_crit:
+			return 0644;
+		}
+		break;
+	case hwmon_curr:
+		if (!data->shunt_uohms)
+			return 0;
+
+		switch (attr) {
+		case hwmon_curr_input:
+		case hwmon_curr_lcrit_alarm:
+		case hwmon_curr_crit_alarm:
+			return 0444;
+		case hwmon_curr_lcrit:
+		case hwmon_curr_crit:
+			return 0644;
+		}
+		break;
+	case hwmon_power:
+		if (!data->shunt_uohms)
+			return 0;
+
+		switch (attr) {
+		case hwmon_power_input:
+		case hwmon_power_crit_alarm:
+			return 0444;
+		case hwmon_power_crit:
+			return 0644;
+		}
+		break;
+	default:
+		break;
+	}
+	return 0;
+}
+
+static const struct hwmon_channel_info *tmp51x_info[] = {
+	HWMON_CHANNEL_INFO(temp,
+			   HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_ALARM |
+			   HWMON_T_CRIT_HYST,
+			   HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_ALARM |
+			   HWMON_T_CRIT_HYST,
+			   HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_ALARM |
+			   HWMON_T_CRIT_HYST,
+			   HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_ALARM |
+			   HWMON_T_CRIT_HYST),
+	HWMON_CHANNEL_INFO(in,
+			   HWMON_I_INPUT | HWMON_I_LCRIT | HWMON_I_LCRIT_ALARM |
+			   HWMON_I_CRIT | HWMON_I_CRIT_ALARM),
+	HWMON_CHANNEL_INFO(curr,
+			   HWMON_C_INPUT | HWMON_C_LCRIT | HWMON_C_LCRIT_ALARM |
+			   HWMON_C_CRIT | HWMON_C_CRIT_ALARM,
+			   HWMON_C_INPUT),
+	HWMON_CHANNEL_INFO(power,
+			   HWMON_P_INPUT | HWMON_P_CRIT | HWMON_P_CRIT_ALARM),
+	NULL
+};
+
+static const struct hwmon_ops tmp51x_hwmon_ops = {
+	.is_visible = tmp51x_is_visible,
+	.read = tmp51x_read,
+	.write = tmp51x_write,
+};
+
+static const struct hwmon_chip_info tmp51x_chip_info = {
+	.ops = &tmp51x_hwmon_ops,
+	.info = tmp51x_info,
+};
+
+/*
+ * Calibrate the tmp51x following the datasheet method
+ */
+static int tmp51x_calibrate(struct tmp51x_data *data)
+{
+	int vshunt_max = data->pga_gain * 40;
+	u64 max_curr_ma;
+	u32 div;
+
+	/*
+	 * If shunt_uohms is equal to 0, the calibration should be set to 0.
+	 * The consequence will be that the current and power measurement engine
+	 * of the sensor will not work. Temperature and voltage sensing will
+	 * continue to work.
+	 */
+	if (data->shunt_uohms == 0)
+		return regmap_write(data->regmap, TMP51X_SHUNT_CALIBRATION, 0);
+
+	max_curr_ma = DIV_ROUND_CLOSEST_ULL(vshunt_max * 1000 * 1000,
+					    data->shunt_uohms);
+
+	/*
+	 * Calculate the minimal bit resolution for the current and the power.
+	 * Those values will be used during register interpretation.
+	 */
+	data->curr_lsb_ua = DIV_ROUND_CLOSEST_ULL(max_curr_ma * 1000, 32767);
+	data->pwr_lsb_uw = 20 * data->curr_lsb_ua;
+
+	div = DIV_ROUND_CLOSEST_ULL(data->curr_lsb_ua * data->shunt_uohms,
+				    1000 * 1000);
+
+	return regmap_write(data->regmap, TMP51X_SHUNT_CALIBRATION,
+			    DIV_ROUND_CLOSEST(40960, div));
+}
+
+/*
+ * Initialize the configuration and calibration registers.
+ */
+static int tmp51x_init(struct tmp51x_data *data)
+{
+	unsigned int regval;
+	int ret = regmap_write(data->regmap, TMP51X_SHUNT_CONFIG,
+			       data->shunt_config);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_write(data->regmap, TMP51X_TEMP_CONFIG, data->temp_config);
+	if (ret < 0)
+		return ret;
+
+	// nFactor configuration
+	ret = regmap_update_bits(data->regmap, TMP51X_N_FACTOR_AND_HYST_1,
+				 TMP51X_NFACTOR_MASK, data->nfactor[0] << 8);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_write(data->regmap, TMP51X_N_FACTOR_2,
+			   data->nfactor[1] << 8);
+	if (ret < 0)
+		return ret;
+
+	if (data->id == tmp513) {
+		ret = regmap_write(data->regmap, TMP513_N_FACTOR_3,
+				   data->nfactor[2] << 8);
+		if (ret < 0)
+			return ret;
+	}
+
+	ret = tmp51x_calibrate(data);
+	if (ret < 0)
+		return ret;
+
+	// Read the status register before using as the datasheet propose
+	return regmap_read(data->regmap, TMP51X_STATUS, &regval);
+}
+
+static const struct i2c_device_id tmp51x_id[] = {
+	{ "tmp512", tmp512 },
+	{ "tmp513", tmp513 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, tmp51x_id);
+
+static const struct of_device_id tmp51x_of_match[] = {
+	{
+		.compatible = "ti,tmp512",
+		.data = (void *)tmp512
+	},
+	{
+		.compatible = "ti,tmp513",
+		.data = (void *)tmp513
+	},
+	{ },
+};
+MODULE_DEVICE_TABLE(of, tmp51x_of_match);
+
+static int tmp51x_vbus_range_to_reg(struct device *dev,
+				    struct tmp51x_data *data)
+{
+	if (data->vbus_range_uvolt == TMP51X_VBUS_RANGE_32V) {
+		data->shunt_config |= TMP51X_BUS_VOLTAGE_MASK;
+	} else if (data->vbus_range_uvolt == TMP51X_VBUS_RANGE_16V) {
+		data->shunt_config &= ~TMP51X_BUS_VOLTAGE_MASK;
+	} else {
+		dev_err(dev, "ti,bus-range-microvolt is invalid: %u\n",
+			data->vbus_range_uvolt);
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static int tmp51x_pga_gain_to_reg(struct device *dev, struct tmp51x_data *data)
+{
+	if (data->pga_gain == 8) {
+		data->shunt_config |= CURRENT_SENSE_VOLTAGE_320_MASK;
+	} else if (data->pga_gain == 4) {
+		data->shunt_config |= CURRENT_SENSE_VOLTAGE_160_MASK;
+	} else if (data->pga_gain == 2) {
+		data->shunt_config |= CURRENT_SENSE_VOLTAGE_80_MASK;
+	} else if (data->pga_gain == 1) {
+		data->shunt_config |= CURRENT_SENSE_VOLTAGE_40_MASK;
+	} else {
+		dev_err(dev, "ti,pga-gain is invalid: %u\n", data->pga_gain);
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static int tmp51x_read_properties(struct device *dev, struct tmp51x_data *data)
+{
+	int ret;
+	u32 nfactor[3];
+	u32 val;
+
+	ret = device_property_read_u32(dev, "shunt-resistor-micro-ohms", &val);
+	data->shunt_uohms = (ret >= 0) ? val : TMP51X_SHUNT_VALUE_DEFAULT;
+
+	ret = device_property_read_u32(dev, "ti,bus-range-microvolt", &val);
+	data->vbus_range_uvolt = (ret >= 0) ? val : TMP51X_VBUS_RANGE_DEFAULT;
+	ret = tmp51x_vbus_range_to_reg(dev, data);
+	if (ret < 0)
+		return ret;
+
+	ret = device_property_read_u32(dev, "ti,pga-gain", &val);
+	data->pga_gain = (ret >= 0) ? val : TMP51X_PGA_DEFAULT;
+	ret = tmp51x_pga_gain_to_reg(dev, data);
+	if (ret < 0)
+		return ret;
+
+	ret = device_property_read_u32_array(dev, "ti,nfactor", nfactor,
+					    (data->id == tmp513) ? 3 : 2);
+	if (ret >= 0)
+		memcpy(data->nfactor, nfactor, (data->id == tmp513) ? 3 : 2);
+
+	// Check if shunt value is compatible with pga-gain
+	if (data->shunt_uohms > data->pga_gain * 40 * 1000 * 1000) {
+		dev_err(dev, "shunt-resistor: %u too big for pga_gain: %u\n",
+			data->shunt_uohms, data->pga_gain);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static void tmp51x_use_default(struct tmp51x_data *data)
+{
+	data->vbus_range_uvolt = TMP51X_VBUS_RANGE_DEFAULT;
+	data->pga_gain = TMP51X_PGA_DEFAULT;
+	data->shunt_uohms = TMP51X_SHUNT_VALUE_DEFAULT;
+}
+
+static int tmp51x_configure(struct device *dev, struct tmp51x_data *data)
+{
+	data->shunt_config = TMP51X_SHUNT_CONFIG_DEFAULT;
+	data->temp_config = (data->id == tmp513) ?
+			TMP513_TEMP_CONFIG_DEFAULT : TMP512_TEMP_CONFIG_DEFAULT;
+
+	if (dev->of_node)
+		return tmp51x_read_properties(dev, data);
+
+	tmp51x_use_default(data);
+
+	return 0;
+}
+
+static int tmp51x_probe(struct i2c_client *client,
+			const struct i2c_device_id *id)
+{
+	struct device *dev = &client->dev;
+	struct tmp51x_data *data;
+	struct device *hwmon_dev;
+	int ret;
+
+	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	if (client->dev.of_node)
+		data->id = (enum tmp51x_ids)device_get_match_data(&client->dev);
+	else
+		data->id = id->driver_data;
+
+	ret = tmp51x_configure(dev, data);
+	if (ret < 0) {
+		dev_err(dev, "error configuring the device: %d\n", ret);
+		return ret;
+	}
+
+	data->regmap = devm_regmap_init_i2c(client, &tmp51x_regmap_config);
+	if (IS_ERR(data->regmap)) {
+		dev_err(dev, "failed to allocate register map\n");
+		return PTR_ERR(data->regmap);
+	}
+
+	ret = tmp51x_init(data);
+	if (ret < 0) {
+		dev_err(dev, "error configuring the device: %d\n", ret);
+		return -ENODEV;
+	}
+
+	hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
+							 data,
+							 &tmp51x_chip_info,
+							 NULL);
+	if (IS_ERR(hwmon_dev))
+		return PTR_ERR(hwmon_dev);
+
+	dev_dbg(dev, "power monitor %s\n", id->name);
+
+	return 0;
+}
+
+static struct i2c_driver tmp51x_driver = {
+	.driver = {
+		.name	= "tmp51x",
+		.of_match_table = of_match_ptr(tmp51x_of_match),
+	},
+	.probe		= tmp51x_probe,
+	.id_table	= tmp51x_id,
+};
+
+module_i2c_driver(tmp51x_driver);
+
+MODULE_AUTHOR("Eric Tremblay <etremblay@distechcontrols.com>");
+MODULE_DESCRIPTION("tmp51x driver");
+MODULE_LICENSE("GPL");

drivers/hwmon/w83793.c

@@ -2096,7 +2096,7 @@ static struct w83793_data *w83793_update_device(struct device *dev)
 static u8 w83793_read_value(struct i2c_client *client, u16 reg)
 {
 	struct w83793_data *data = i2c_get_clientdata(client);
-	u8 res = 0xff;
+	u8 res;
 	u8 new_bank = reg >> 8;
 
 	new_bank |= data->bank & 0xfc;