Merge tag 'hwmon-for-linus-v4.16' of...

Merge tag 'hwmon-for-linus-v4.16' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging

Pull hwmon updates from Guenter Roeck:

 - New driver for W83773G

 - Fan control support for PMBus drivers

 - Improvements and minor fixes in several drivers

* tag 'hwmon-for-linus-v4.16' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging: (32 commits)
  hwmon: (dell-smm) Disable fan support for Dell Vostro 3360
  hwmon: (dell-smm) Disable fan support for Dell Inspiron 7720
  hwmon: (dell-smm) Enable broken functionality via "force" module param
  hwmon: (k10temp) Add temperature offset for Ryzen 1900X
  hwmon: (lm75) Fix trailing semicolon
  hwmon: (ina2xx) Fix access to uninitialized mutex
  hwmon: (pmbus/ir35221) Remove unnecessary scaling
  hwmon: (sht3x) wait predefined limits loading complete before access
  hwmon: (pmbus/ibm-cffps) Add dependency on LEDS_CLASS
  hwmon: (pmbus/cffps) Add led class device for power supply fault led
  hwmon: (pmbus) cffps: Add PMBUS_SKIP_STATUS_CHECK
  hwmon: (aspeed-pwm-tacho) Deassert reset in probe
  dt-bindings: hwmon: aspeed-pwm-tacho: Add reset node
  hwmon: (pmbus) cffps: Add debugfs entries
  hwmon: (pmbus) Export pmbus device debugfs directory entry
  hwmon: (w83773g) Fix fault detection and reporting
  hwmon: (hih6130) Fix documentation of struct hih6130
  hwmon: (iio_hwmon) Fix documentation of struct iio_hwmon_state
  hwmon: (sht15) Fix parameter documentation of sht15_crc8()
  hwmon: (sht21) Fix documentation of struct sht21
  ...

Documentation/devicetree/bindings/hwmon/aspeed-pwm-tacho.txt

@@ -22,8 +22,9 @@ Required properties for pwm-tacho node:
 - compatible : should be "aspeed,ast2400-pwm-tacho" for AST2400 and
 	       "aspeed,ast2500-pwm-tacho" for AST2500.
 
-- clocks : a fixed clock providing input clock frequency(PWM
-	   and Fan Tach clock)
+- clocks : phandle to clock provider with the clock number in the second cell
+
+- resets : phandle to reset controller with the reset number in the second cell
 
 fan subnode format:
 ===================
@@ -48,19 +49,14 @@ Required properties for each child node:
 
 Examples:
 
-pwm_tacho_fixed_clk: fixedclk {
-	compatible = "fixed-clock";
-	#clock-cells = <0>;
-	clock-frequency = <24000000>;
-};
-
 pwm_tacho: pwmtachocontroller@1e786000 {
 	#address-cells = <1>;
 	#size-cells = <1>;
 	#cooling-cells = <2>;
 	reg = <0x1E786000 0x1000>;
 	compatible = "aspeed,ast2500-pwm-tacho";
-	clocks = <&pwm_tacho_fixed_clk>;
+	clocks = <&syscon ASPEED_CLK_APB>;
+	resets = <&syscon ASPEED_RESET_PWM>;
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_pwm0_default &pinctrl_pwm1_default>;
 

Documentation/hwmon/lm25066

@@ -8,11 +8,6 @@ Supported chips:
     Datasheets:
 	http://www.ti.com/lit/gpn/lm25056
 	http://www.ti.com/lit/gpn/lm25056a
-  * TI LM25063
-    Prefix: 'lm25063'
-    Addresses scanned: -
-    Datasheet:
-	To be announced
   * National Semiconductor LM25066
     Prefix: 'lm25066'
     Addresses scanned: -
@@ -42,7 +37,7 @@ Description
 -----------
 
 This driver supports hardware monitoring for National Semiconductor / TI LM25056,
-LM25063, LM25066, LM5064, and LM5066/LM5066I Power Management, Monitoring,
+LM25066, LM5064, and LM5066/LM5066I Power Management, Monitoring,
 Control, and Protection ICs.
 
 The driver is a client driver to the core PMBus driver. Please see
@@ -74,12 +69,8 @@ in1_input		Measured input voltage.
 in1_average		Average measured input voltage.
 in1_min			Minimum input voltage.
 in1_max			Maximum input voltage.
-in1_crit		Critical high input voltage (LM25063 only).
-in1_lcrit		Critical low input voltage (LM25063 only).
 in1_min_alarm		Input voltage low alarm.
 in1_max_alarm		Input voltage high alarm.
-in1_lcrit_alarm		Input voltage critical low alarm (LM25063 only).
-in1_crit_alarm		Input voltage critical high alarm. (LM25063 only).
 
 in2_label		"vmon"
 in2_input		Measured voltage on VAUX pin
@@ -94,16 +85,12 @@ in3_input		Measured output voltage.
 in3_average		Average measured output voltage.
 in3_min			Minimum output voltage.
 in3_min_alarm		Output voltage low alarm.
-in3_highest		Historical minimum output voltage (LM25063 only).
-in3_lowest		Historical maximum output voltage (LM25063 only).
 
 curr1_label		"iin"
 curr1_input		Measured input current.
 curr1_average		Average measured input current.
 curr1_max		Maximum input current.
-curr1_crit		Critical input current (LM25063 only).
 curr1_max_alarm		Input current high alarm.
-curr1_crit_alarm	Input current critical high alarm (LM25063 only).
 
 power1_label		"pin"
 power1_input		Measured input power.
@@ -113,11 +100,6 @@ power1_alarm		Input power alarm
 power1_input_highest	Historical maximum power.
 power1_reset_history	Write any value to reset maximum power history.
 
-power2_label		"pout". LM25063 only.
-power2_input		Measured output power.
-power2_max		Maximum output power limit.
-power2_crit		Critical output power limit.
-
 temp1_input		Measured temperature.
 temp1_max		Maximum temperature.
 temp1_crit		Critical high temperature.

Documentation/hwmon/max31785

@@ -17,8 +17,9 @@ management with temperature and remote voltage sensing. Various fan control
 features are provided, including PWM frequency control, temperature hysteresis,
 dual tachometer measurements, and fan health monitoring.
 
-For dual rotor fan configuration, the MAX31785 exposes the slowest rotor of the
-two in the fan[1-4]_input attributes.
+For dual-rotor configurations the MAX31785A exposes the second rotor tachometer
+readings in attributes fan[5-8]_input. By contrast the MAX31785 only exposes
+the slowest rotor measurement, and does so in the fan[1-4]_input attributes.
 
 Usage Notes
 -----------
@@ -31,7 +32,9 @@ Sysfs attributes
 
 fan[1-4]_alarm		Fan alarm.
 fan[1-4]_fault		Fan fault.
-fan[1-4]_input		Fan RPM.
+fan[1-8]_input		Fan RPM. On the MAX31785A, inputs 5-8 correspond to the
+			second rotor of fans 1-4
+fan[1-4]_target		Fan input target
 
 in[1-6]_crit		Critical maximum output voltage
 in[1-6]_crit_alarm	Output voltage critical high alarm
@@ -44,6 +47,12 @@ in[1-6]_max_alarm	Output voltage high alarm
 in[1-6]_min		Minimum output voltage
 in[1-6]_min_alarm	Output voltage low alarm
 
+pwm[1-4]		Fan target duty cycle (0..255)
+pwm[1-4]_enable		0: Full-speed
+			1: Manual PWM control
+			2: Automatic PWM (tach-feedback RPM fan-control)
+			3: Automatic closed-loop (temp-feedback fan-control)
+
 temp[1-11]_crit		Critical high temperature
 temp[1-11]_crit_alarm	Chip temperature critical high alarm
 temp[1-11]_input	Measured temperature

Documentation/hwmon/w83773g

+Kernel driver w83773g
+====================
+
+Supported chips:
+  * Nuvoton W83773G
+    Prefix: 'w83773g'
+    Addresses scanned: I2C 0x4c and 0x4d
+    Datasheet: https://www.nuvoton.com/resource-files/W83773G_SG_DatasheetV1_2.pdf
+
+Authors:
+	Lei YU <mine260309@gmail.com>
+
+Description
+-----------
+
+This driver implements support for Nuvoton W83773G temperature sensor
+chip. This chip implements one local and two remote sensors.
+The chip also features offsets for the two remote sensors which get added to
+the input readings. The chip does all the scaling by itself and the driver
+therefore reports true temperatures that don't need any user-space adjustments.
+Temperature is measured in degrees Celsius.
+The chip is wired over I2C/SMBus and specified over a temperature
+range of -40 to +125 degrees Celsius (for local sensor) and -40 to +127
+degrees Celsius (for remote sensors).
+Resolution for both the local and remote channels is 0.125 degree C.
+
+The chip supports only temperature measurement. The driver exports
+the temperature values via the following sysfs files:
+
+temp[1-3]_input
+temp[2-3]_fault
+temp[2-3]_offset
+update_interval

drivers/hwmon/Kconfig

@@ -26,11 +26,9 @@ if HWMON
 
 config HWMON_VID
 	tristate
-	default n
 
 config HWMON_DEBUG_CHIP
 	bool "Hardware Monitoring Chip debugging messages"
-	default n
 	help
 	  Say Y here if you want the I2C chip drivers to produce a bunch of
 	  debug messages to the system log.  Select this if you are having
@@ -42,7 +40,6 @@ comment "Native drivers"
 config SENSORS_AB8500
 	tristate "AB8500 thermal monitoring"
 	depends on AB8500_GPADC && AB8500_BM
-	default n
 	help
 	  If you say yes here you get support for the thermal sensor part
 	  of the AB8500 chip. The driver includes thermal management for
@@ -302,7 +299,6 @@ config SENSORS_APPLESMC
 	select NEW_LEDS
 	select LEDS_CLASS
 	select INPUT_POLLDEV
-	default n
 	help
 	  This driver provides support for the Apple System Management
 	  Controller, which provides an accelerometer (Apple Sudden Motion
@@ -678,7 +674,6 @@ config SENSORS_JC42
 config SENSORS_POWR1220
 	tristate "Lattice POWR1220 Power Monitoring"
 	depends on I2C
-	default n
 	help
 	  If you say yes here you get access to the hardware monitoring
 	  functions of the Lattice POWR1220 isp Power Supply Monitoring,
@@ -702,7 +697,6 @@ config SENSORS_LTC2945
 	tristate "Linear Technology LTC2945"
 	depends on I2C
 	select REGMAP_I2C
-	default n
 	help
 	  If you say yes here you get support for Linear Technology LTC2945
 	  I2C System Monitor.
@@ -727,7 +721,6 @@ config SENSORS_LTC2990
 config SENSORS_LTC4151
 	tristate "Linear Technology LTC4151"
 	depends on I2C
-	default n
 	help
 	  If you say yes here you get support for Linear Technology LTC4151
 	  High Voltage I2C Current and Voltage Monitor interface.
@@ -738,7 +731,6 @@ config SENSORS_LTC4151
 config SENSORS_LTC4215
 	tristate "Linear Technology LTC4215"
 	depends on I2C
-	default n
 	help
 	  If you say yes here you get support for Linear Technology LTC4215
 	  Hot Swap Controller I2C interface.
@@ -750,7 +742,6 @@ config SENSORS_LTC4222
 	tristate "Linear Technology LTC4222"
 	depends on I2C
 	select REGMAP_I2C
-	default n
 	help
 	  If you say yes here you get support for Linear Technology LTC4222
 	  Dual Hot Swap Controller I2C interface.
@@ -761,7 +752,6 @@ config SENSORS_LTC4222
 config SENSORS_LTC4245
 	tristate "Linear Technology LTC4245"
 	depends on I2C
-	default n
 	help
 	  If you say yes here you get support for Linear Technology LTC4245
 	  Multiple Supply Hot Swap Controller I2C interface.
@@ -773,7 +763,6 @@ config SENSORS_LTC4260
 	tristate "Linear Technology LTC4260"
 	depends on I2C
 	select REGMAP_I2C
-	default n
 	help
 	  If you say yes here you get support for Linear Technology LTC4260
 	  Positive Voltage Hot Swap Controller I2C interface.
@@ -784,7 +773,6 @@ config SENSORS_LTC4260
 config SENSORS_LTC4261
 	tristate "Linear Technology LTC4261"
 	depends on I2C
-	default n
 	help
 	  If you say yes here you get support for Linear Technology LTC4261
 	  Negative Voltage Hot Swap Controller I2C interface.
@@ -1276,7 +1264,6 @@ config SENSORS_NSA320
 config SENSORS_PCF8591
 	tristate "Philips PCF8591 ADC/DAC"
 	depends on I2C
-	default n
 	help
 	  If you say yes here you get support for Philips PCF8591 4-channel
 	  ADC, 1-channel DAC chips.
@@ -1459,7 +1446,6 @@ config SENSORS_SMSC47B397
 
 config SENSORS_SCH56XX_COMMON
 	tristate
-	default n
 
 config SENSORS_SCH5627
 	tristate "SMSC SCH5627"
@@ -1505,7 +1491,6 @@ config SENSORS_STTS751
 config SENSORS_SMM665
 	tristate "Summit Microelectronics SMM665"
 	depends on I2C
-	default n
 	help
 	  If you say yes here you get support for the hardware monitoring
 	  features of the Summit Microelectronics SMM665/SMM665B Six-Channel
@@ -1725,6 +1710,16 @@ config SENSORS_VT8231
 	  This driver can also be built as a module.  If so, the module
 	  will be called vt8231.
 
+config SENSORS_W83773G
+	tristate "Nuvoton W83773G"
+	depends on I2C
+	help
+	  If you say yes here you get support for the Nuvoton W83773G hardware
+	  monitoring chip.
+
+	  This driver can also be built as a module.  If so, the module
+	  will be called w83773g.
+
 config SENSORS_W83781D
 	tristate "Winbond W83781D, W83782D, W83783S, Asus AS99127F"
 	depends on I2C
@@ -1782,7 +1777,6 @@ config SENSORS_W83795
 config SENSORS_W83795_FANCTRL
 	bool "Include automatic fan control support (DANGEROUS)"
 	depends on SENSORS_W83795
-	default n
 	help
 	  If you say yes here, support for automatic fan speed control
 	  will be included in the driver.

drivers/hwmon/Makefile

@@ -14,6 +14,7 @@ obj-$(CONFIG_SENSORS_ATK0110)	+= asus_atk0110.o
 # asb100, then w83781d go first, as they can override other drivers' addresses.
 obj-$(CONFIG_SENSORS_ASB100)	+= asb100.o
 obj-$(CONFIG_SENSORS_W83627HF)	+= w83627hf.o
+obj-$(CONFIG_SENSORS_W83773G)	+= w83773g.o
 obj-$(CONFIG_SENSORS_W83792D)	+= w83792d.o
 obj-$(CONFIG_SENSORS_W83793)	+= w83793.o
 obj-$(CONFIG_SENSORS_W83795)	+= w83795.o

drivers/hwmon/aspeed-pwm-tacho.c

@@ -19,6 +19,7 @@
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
+#include <linux/reset.h>
 #include <linux/sysfs.h>
 #include <linux/thermal.h>
 
@@ -181,6 +182,7 @@ struct aspeed_cooling_device {
 
 struct aspeed_pwm_tacho_data {
 	struct regmap *regmap;
+	struct reset_control *rst;
 	unsigned long clk_freq;
 	bool pwm_present[8];
 	bool fan_tach_present[16];
@@ -905,6 +907,13 @@ static int aspeed_create_fan(struct device *dev,
 	return 0;
 }
 
+static void aspeed_pwm_tacho_remove(void *data)
+{
+	struct aspeed_pwm_tacho_data *priv = data;
+
+	reset_control_assert(priv->rst);
+}
+
 static int aspeed_pwm_tacho_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -931,6 +940,19 @@ static int aspeed_pwm_tacho_probe(struct platform_device *pdev)
 			&aspeed_pwm_tacho_regmap_config);
 	if (IS_ERR(priv->regmap))
 		return PTR_ERR(priv->regmap);
+
+	priv->rst = devm_reset_control_get_exclusive(dev, NULL);
+	if (IS_ERR(priv->rst)) {
+		dev_err(dev,
+			"missing or invalid reset controller device tree entry");
+		return PTR_ERR(priv->rst);
+	}
+	reset_control_deassert(priv->rst);
+
+	ret = devm_add_action_or_reset(dev, aspeed_pwm_tacho_remove, priv);
+	if (ret)
+		return ret;
+
 	regmap_write(priv->regmap, ASPEED_PTCR_TACH_SOURCE, 0);
 	regmap_write(priv->regmap, ASPEED_PTCR_TACH_SOURCE_EXT, 0);
 

drivers/hwmon/coretemp.c

@@ -246,7 +246,8 @@ static int adjust_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *dev)
 	int err;
 	u32 eax, edx;
 	int i;
-	struct pci_dev *host_bridge = pci_get_bus_and_slot(0, PCI_DEVFN(0, 0));
+	u16 devfn = PCI_DEVFN(0, 0);
+	struct pci_dev *host_bridge = pci_get_domain_bus_and_slot(0, 0, devfn);
 
 	/*
 	 * Explicit tjmax table entries override heuristics.

drivers/hwmon/dell-smm-hwmon.c

@@ -76,6 +76,7 @@ static uint i8k_fan_mult = I8K_FAN_MULT;
 static uint i8k_pwm_mult;
 static uint i8k_fan_max = I8K_FAN_HIGH;
 static bool disallow_fan_type_call;
+static bool disallow_fan_support;
 
 #define I8K_HWMON_HAVE_TEMP1	(1 << 0)
 #define I8K_HWMON_HAVE_TEMP2	(1 << 1)
@@ -242,6 +243,9 @@ static int i8k_get_fan_status(int fan)
 {
 	struct smm_regs regs = { .eax = I8K_SMM_GET_FAN, };
 
+	if (disallow_fan_support)
+		return -EINVAL;
+
 	regs.ebx = fan & 0xff;
 	return i8k_smm(&regs) ? : regs.eax & 0xff;
 }
@@ -253,6 +257,9 @@ static int i8k_get_fan_speed(int fan)
 {
 	struct smm_regs regs = { .eax = I8K_SMM_GET_SPEED, };
 
+	if (disallow_fan_support)
+		return -EINVAL;
+
 	regs.ebx = fan & 0xff;
 	return i8k_smm(&regs) ? : (regs.eax & 0xffff) * i8k_fan_mult;
 }
@@ -264,7 +271,7 @@ static int _i8k_get_fan_type(int fan)
 {
 	struct smm_regs regs = { .eax = I8K_SMM_GET_FAN_TYPE, };
 
-	if (disallow_fan_type_call)
+	if (disallow_fan_support || disallow_fan_type_call)
 		return -EINVAL;
 
 	regs.ebx = fan & 0xff;
@@ -289,6 +296,9 @@ static int i8k_get_fan_nominal_speed(int fan, int speed)
 {
 	struct smm_regs regs = { .eax = I8K_SMM_GET_NOM_SPEED, };
 
+	if (disallow_fan_support)
+		return -EINVAL;
+
 	regs.ebx = (fan & 0xff) | (speed << 8);
 	return i8k_smm(&regs) ? : (regs.eax & 0xffff) * i8k_fan_mult;
 }
@@ -300,6 +310,9 @@ static int i8k_set_fan(int fan, int speed)
 {
 	struct smm_regs regs = { .eax = I8K_SMM_SET_FAN, };
 
+	if (disallow_fan_support)
+		return -EINVAL;
+
 	speed = (speed < 0) ? 0 : ((speed > i8k_fan_max) ? i8k_fan_max : speed);
 	regs.ebx = (fan & 0xff) | (speed << 8);
 
@@ -772,6 +785,8 @@ static struct attribute *i8k_attrs[] = {
 static umode_t i8k_is_visible(struct kobject *kobj, struct attribute *attr,
 			      int index)
 {
+	if (disallow_fan_support && index >= 8)
+		return 0;
 	if (disallow_fan_type_call &&
 	    (index == 9 || index == 12 || index == 15))
 		return 0;
@@ -1038,6 +1053,30 @@ static const struct dmi_system_id i8k_blacklist_fan_type_dmi_table[] __initconst
 	{ }
 };
 
+/*
+ * On some machines all fan related SMM functions implemented by Dell BIOS
+ * firmware freeze kernel for about 500ms. Until Dell fixes these problems fan
+ * support for affected blacklisted Dell machines stay disabled.
+ * See bug: https://bugzilla.kernel.org/show_bug.cgi?id=195751
+ */
+static struct dmi_system_id i8k_blacklist_fan_support_dmi_table[] __initdata = {
+	{
+		.ident = "Dell Inspiron 7720",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Inspiron 7720"),
+		},
+	},
+	{
+		.ident = "Dell Vostro 3360",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Vostro 3360"),
+		},
+	},
+	{ }
+};
+
 /*
  * Probe for the presence of a supported laptop.
  */
@@ -1060,8 +1099,17 @@ static int __init i8k_probe(void)
 			i8k_get_dmi_data(DMI_BIOS_VERSION));
 	}
 
-	if (dmi_check_system(i8k_blacklist_fan_type_dmi_table))
+	if (dmi_check_system(i8k_blacklist_fan_support_dmi_table)) {
+		pr_warn("broken Dell BIOS detected, disallow fan support\n");
+		if (!force)
+			disallow_fan_support = true;
+	}
+
+	if (dmi_check_system(i8k_blacklist_fan_type_dmi_table)) {
+		pr_warn("broken Dell BIOS detected, disallow fan type call\n");
+		if (!force)
 			disallow_fan_type_call = true;
+	}
 
 	strlcpy(bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION),
 		sizeof(bios_version));

drivers/hwmon/hih6130.c

@@ -37,7 +37,7 @@
 
 /**
  * struct hih6130 - HIH-6130 device specific data
- * @hwmon_dev: device registered with hwmon
+ * @client: pointer to I2C client device
  * @lock: mutex to protect measurement values
  * @valid: only false before first measurement is taken
  * @last_update: time of last update (jiffies)

drivers/hwmon/hwmon.c

@@ -678,7 +678,7 @@ EXPORT_SYMBOL_GPL(hwmon_device_register_with_groups);
  * @dev: the parent device
  * @name: hwmon name attribute
  * @drvdata: driver data to attach to created device
- * @info: pointer to hwmon chip information
+ * @chip: pointer to hwmon chip information
  * @extra_groups: pointer to list of additional non-standard attribute groups
  *
  * hwmon_device_unregister() must be called when the device is no
@@ -788,8 +788,8 @@ EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_groups);
  * @dev:	the parent device
  * @name:	hwmon name attribute
  * @drvdata:	driver data to attach to created device
- * @info: Pointer to hwmon chip information
- * @groups - pointer to list of driver specific attribute groups
+ * @chip:	pointer to hwmon chip information
+ * @groups:	pointer to list of driver specific attribute groups
  *
  * Returns the pointer to the new device. The new device is automatically
  * unregistered with the parent device.

drivers/hwmon/iio_hwmon.c

@@ -24,6 +24,7 @@
  * @num_channels:	number of channels in channels (saves counting twice)
  * @hwmon_dev:		associated hwmon device
  * @attr_group:		the group of attributes
+ * @groups:		null terminated array of attribute groups
  * @attrs:		null terminated array of attribute pointers.
  */
 struct iio_hwmon_state {

drivers/hwmon/ina2xx.c

@@ -95,18 +95,20 @@ enum ina2xx_ids { ina219, ina226 };
 
 struct ina2xx_config {
 	u16 config_default;
-	int calibration_factor;
+	int calibration_value;
 	int registers;
 	int shunt_div;
 	int bus_voltage_shift;
 	int bus_voltage_lsb;	/* uV */
-	int power_lsb;		/* uW */
+	int power_lsb_factor;
 };
 
 struct ina2xx_data {
 	const struct ina2xx_config *config;
 
 	long rshunt;
+	long current_lsb_uA;
+	long power_lsb_uW;
 	struct mutex config_lock;
 	struct regmap *regmap;
 
@@ -116,21 +118,21 @@ struct ina2xx_data {
 static const struct ina2xx_config ina2xx_config[] = {
 	[ina219] = {
 		.config_default = INA219_CONFIG_DEFAULT,
-		.calibration_factor = 40960000,
+		.calibration_value = 4096,
 		.registers = INA219_REGISTERS,
 		.shunt_div = 100,
 		.bus_voltage_shift = 3,
 		.bus_voltage_lsb = 4000,
-		.power_lsb = 20000,
+		.power_lsb_factor = 20,
 	},
 	[ina226] = {
 		.config_default = INA226_CONFIG_DEFAULT,
-		.calibration_factor = 5120000,
+		.calibration_value = 2048,
 		.registers = INA226_REGISTERS,
 		.shunt_div = 400,
 		.bus_voltage_shift = 0,
 		.bus_voltage_lsb = 1250,
-		.power_lsb = 25000,
+		.power_lsb_factor = 25,
 	},
 };
 
@@ -169,12 +171,16 @@ static u16 ina226_interval_to_reg(int interval)
 	return INA226_SHIFT_AVG(avg_bits);
 }
 
+/*
+ * Calibration register is set to the best value, which eliminates
+ * truncation errors on calculating current register in hardware.
+ * According to datasheet (eq. 3) the best values are 2048 for
+ * ina226 and 4096 for ina219. They are hardcoded as calibration_value.
+ */
 static int ina2xx_calibrate(struct ina2xx_data *data)
 {
-	u16 val = DIV_ROUND_CLOSEST(data->config->calibration_factor,
-				    data->rshunt);
-
-	return regmap_write(data->regmap, INA2XX_CALIBRATION, val);
+	return regmap_write(data->regmap, INA2XX_CALIBRATION,
+			    data->config->calibration_value);
 }
 
 /*
@@ -187,10 +193,6 @@ static int ina2xx_init(struct ina2xx_data *data)
 	if (ret < 0)
 		return ret;
 
-	/*
-	 * Set current LSB to 1mA, shunt is in uOhms
-	 * (equation 13 in datasheet).
-	 */
 	return ina2xx_calibrate(data);
 }
 
@@ -268,15 +270,15 @@ static int ina2xx_get_value(struct ina2xx_data *data, u8 reg,
 		val = DIV_ROUND_CLOSEST(val, 1000);
 		break;
 	case INA2XX_POWER:
-		val = regval * data->config->power_lsb;
+		val = regval * data->power_lsb_uW;
 		break;
 	case INA2XX_CURRENT:
-		/* signed register, LSB=1mA (selected), in mA */
-		val = (s16)regval;
+		/* signed register, result in mA */
+		val = regval * data->current_lsb_uA;
+		val = DIV_ROUND_CLOSEST(val, 1000);
 		break;
 	case INA2XX_CALIBRATION:
-		val = DIV_ROUND_CLOSEST(data->config->calibration_factor,
-					regval);
+		val = regval;
 		break;
 	default:
 		/* programmer goofed */
@@ -304,7 +306,30 @@ static ssize_t ina2xx_show_value(struct device *dev,
 			ina2xx_get_value(data, attr->index, regval));
 }
 
-static ssize_t ina2xx_set_shunt(struct device *dev,
+/*
+ * In order to keep calibration register value fixed, the product
+ * of current_lsb and shunt_resistor should also be fixed and equal
+ * to shunt_voltage_lsb = 1 / shunt_div multiplied by 10^9 in order
+ * to keep the scale.
+ */
+static int ina2xx_set_shunt(struct ina2xx_data *data, long val)
+{
+	unsigned int dividend = DIV_ROUND_CLOSEST(1000000000,
+						  data->config->shunt_div);
+	if (val <= 0 || val > dividend)
+		return -EINVAL;
+
+	mutex_lock(&data->config_lock);
+	data->rshunt = val;
+	data->current_lsb_uA = DIV_ROUND_CLOSEST(dividend, val);
+	data->power_lsb_uW = data->config->power_lsb_factor *
+			     data->current_lsb_uA;
+	mutex_unlock(&data->config_lock);
+
+	return 0;
+}
+
+static ssize_t ina2xx_store_shunt(struct device *dev,
 				  struct device_attribute *da,
 				  const char *buf, size_t count)
 {
@@ -316,18 +341,9 @@ static ssize_t ina2xx_set_shunt(struct device *dev,
 	if (status < 0)
 		return status;
 
-	if (val == 0 ||
-	    /* Values greater than the calibration factor make no sense. */
-	    val > data->config->calibration_factor)
-		return -EINVAL;
-
-	mutex_lock(&data->config_lock);
-	data->rshunt = val;
-	status = ina2xx_calibrate(data);
-	mutex_unlock(&data->config_lock);
+	status = ina2xx_set_shunt(data, val);
 	if (status < 0)
 		return status;
-
 	return count;
 }
 
@@ -387,7 +403,7 @@ static SENSOR_DEVICE_ATTR(power1_input, S_IRUGO, ina2xx_show_value, NULL,
 
 /* shunt resistance */
 static SENSOR_DEVICE_ATTR(shunt_resistor, S_IRUGO | S_IWUSR,
-			  ina2xx_show_value, ina2xx_set_shunt,
+			  ina2xx_show_value, ina2xx_store_shunt,
 			  INA2XX_CALIBRATION);
 
 /* update interval (ina226 only) */
@@ -438,6 +454,7 @@ static int ina2xx_probe(struct i2c_client *client,
 
 	/* set the device type */
 	data->config = &ina2xx_config[chip];
+	mutex_init(&data->config_lock);
 
 	if (of_property_read_u32(dev->of_node, "shunt-resistor", &val) < 0) {
 		struct ina2xx_platform_data *pdata = dev_get_platdata(dev);
@@ -448,10 +465,7 @@ static int ina2xx_probe(struct i2c_client *client,
 			val = INA2XX_RSHUNT_DEFAULT;
 	}
 
-	if (val <= 0 || val > data->config->calibration_factor)
-		return -ENODEV;
-
-	data->rshunt = val;
+	ina2xx_set_shunt(data, val);
 
 	ina2xx_regmap_config.max_register = data->config->registers;
 
@@ -467,8 +481,6 @@ static int ina2xx_probe(struct i2c_client *client,
 		return -ENODEV;
 	}
 
-	mutex_init(&data->config_lock);
-
 	data->groups[group++] = &ina2xx_group;
 	if (id->driver_data == ina226)
 		data->groups[group++] = &ina226_group;

drivers/hwmon/k10temp.c

@@ -86,6 +86,7 @@ static const struct tctl_offset tctl_offset_table[] = {
 	{ 0x17, "AMD Ryzen 7 1800X", 20000 },
 	{ 0x17, "AMD Ryzen Threadripper 1950X", 27000 },
 	{ 0x17, "AMD Ryzen Threadripper 1920X", 27000 },
+	{ 0x17, "AMD Ryzen Threadripper 1900X", 27000 },
 	{ 0x17, "AMD Ryzen Threadripper 1950", 10000 },
 	{ 0x17, "AMD Ryzen Threadripper 1920", 10000 },
 	{ 0x17, "AMD Ryzen Threadripper 1910", 10000 },

drivers/hwmon/lm75.c

@@ -100,7 +100,7 @@ static int lm75_read(struct device *dev, enum hwmon_sensor_types type,
 		switch (attr) {
 		case hwmon_chip_update_interval:
 			*val = data->sample_time;
-			break;;
+			break;
 		default:
 			return -EINVAL;
 		}

drivers/hwmon/pmbus/Kconfig

@@ -39,6 +39,7 @@ config SENSORS_ADM1275
 
 config SENSORS_IBM_CFFPS
 	tristate "IBM Common Form Factor Power Supply"
+	depends on LEDS_CLASS
 	help
 	  If you say yes here you get hardware monitoring support for the IBM
 	  Common Form Factor power supply.

drivers/hwmon/pmbus/ibm-cffps.c

@@ -8,12 +8,29 @@
  */
 
 #include <linux/bitops.h>
+#include <linux/debugfs.h>
 #include <linux/device.h>
+#include <linux/fs.h>
 #include <linux/i2c.h>
+#include <linux/jiffies.h>
+#include <linux/leds.h>
 #include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/pmbus.h>
 
 #include "pmbus.h"
 
+#define CFFPS_FRU_CMD				0x9A
+#define CFFPS_PN_CMD				0x9B
+#define CFFPS_SN_CMD				0x9E
+#define CFFPS_CCIN_CMD				0xBD
+#define CFFPS_FW_CMD_START			0xFA
+#define CFFPS_FW_NUM_BYTES			4
+#define CFFPS_SYS_CONFIG_CMD			0xDA
+
+#define CFFPS_INPUT_HISTORY_CMD			0xD6
+#define CFFPS_INPUT_HISTORY_SIZE		100
+
 /* STATUS_MFR_SPECIFIC bits */
 #define CFFPS_MFR_FAN_FAULT			BIT(0)
 #define CFFPS_MFR_THERMAL_FAULT			BIT(1)
@@ -24,6 +41,153 @@
 #define CFFPS_MFR_VAUX_FAULT			BIT(6)
 #define CFFPS_MFR_CURRENT_SHARE_WARNING		BIT(7)
 
+#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 {
+	CFFPS_DEBUGFS_INPUT_HISTORY = 0,
+	CFFPS_DEBUGFS_FRU,
+	CFFPS_DEBUGFS_PN,
+	CFFPS_DEBUGFS_SN,
+	CFFPS_DEBUGFS_CCIN,
+	CFFPS_DEBUGFS_FW,
+	CFFPS_DEBUGFS_NUM_ENTRIES
+};
+
+struct ibm_cffps_input_history {
+	struct mutex update_lock;
+	unsigned long last_update;
+
+	u8 byte_count;
+	u8 data[CFFPS_INPUT_HISTORY_SIZE];
+};
+
+struct ibm_cffps {
+	struct i2c_client *client;
+
+	struct ibm_cffps_input_history input_history;
+
+	int debugfs_entries[CFFPS_DEBUGFS_NUM_ENTRIES];
+
+	char led_name[32];
+	u8 led_state;
+	struct led_classdev led;
+};
+
+#define to_psu(x, y) container_of((x), struct ibm_cffps, debugfs_entries[(y)])
+
+static ssize_t ibm_cffps_read_input_history(struct ibm_cffps *psu,
+					    char __user *buf, size_t count,
+					    loff_t *ppos)
+{
+	int rc;
+	u8 msgbuf0[1] = { CFFPS_INPUT_HISTORY_CMD };
+	u8 msgbuf1[CFFPS_INPUT_HISTORY_SIZE + 1] = { 0 };
+	struct i2c_msg msg[2] = {
+		{
+			.addr = psu->client->addr,
+			.flags = psu->client->flags,
+			.len = 1,
+			.buf = msgbuf0,
+		}, {
+			.addr = psu->client->addr,
+			.flags = psu->client->flags | I2C_M_RD,
+			.len = CFFPS_INPUT_HISTORY_SIZE + 1,
+			.buf = msgbuf1,
+		},
+	};
+
+	if (!*ppos) {
+		mutex_lock(&psu->input_history.update_lock);
+		if (time_after(jiffies, psu->input_history.last_update + HZ)) {
+			/*
+			 * Use a raw i2c transfer, since we need more bytes
+			 * than Linux I2C supports through smbus xfr (only 32).
+			 */
+			rc = i2c_transfer(psu->client->adapter, msg, 2);
+			if (rc < 0) {
+				mutex_unlock(&psu->input_history.update_lock);
+				return rc;
+			}
+
+			psu->input_history.byte_count = msgbuf1[0];
+			memcpy(psu->input_history.data, &msgbuf1[1],
+			       CFFPS_INPUT_HISTORY_SIZE);
+			psu->input_history.last_update = jiffies;
+		}
+
+		mutex_unlock(&psu->input_history.update_lock);
+	}
+
+	return simple_read_from_buffer(buf, count, ppos,
+				       psu->input_history.data,
+				       psu->input_history.byte_count);
+}
+
+static ssize_t ibm_cffps_debugfs_op(struct file *file, char __user *buf,
+				    size_t count, loff_t *ppos)
+{
+	u8 cmd;
+	int i, rc;
+	int *idxp = file->private_data;
+	int idx = *idxp;
+	struct ibm_cffps *psu = to_psu(idxp, idx);
+	char data[I2C_SMBUS_BLOCK_MAX] = { 0 };
+
+	switch (idx) {
+	case CFFPS_DEBUGFS_INPUT_HISTORY:
+		return ibm_cffps_read_input_history(psu, buf, count, ppos);
+	case CFFPS_DEBUGFS_FRU:
+		cmd = CFFPS_FRU_CMD;
+		break;
+	case CFFPS_DEBUGFS_PN:
+		cmd = CFFPS_PN_CMD;
+		break;
+	case CFFPS_DEBUGFS_SN:
+		cmd = CFFPS_SN_CMD;
+		break;
+	case CFFPS_DEBUGFS_CCIN:
+		rc = i2c_smbus_read_word_swapped(psu->client, CFFPS_CCIN_CMD);
+		if (rc < 0)
+			return rc;
+
+		rc = snprintf(data, 5, "%04X", rc);
+		goto done;
+	case CFFPS_DEBUGFS_FW:
+		for (i = 0; i < CFFPS_FW_NUM_BYTES; ++i) {
+			rc = i2c_smbus_read_byte_data(psu->client,
+						      CFFPS_FW_CMD_START + i);
+			if (rc < 0)
+				return rc;
+
+			snprintf(&data[i * 2], 3, "%02X", rc);
+		}
+
+		rc = i * 2;
+		goto done;
+	default:
+		return -EINVAL;
+	}
+
+	rc = i2c_smbus_read_block_data(psu->client, cmd, data);
+	if (rc < 0)
+		return rc;
+
+done:
+	data[rc] = '\n';
+	rc += 2;
+
+	return simple_read_from_buffer(buf, count, ppos, data, rc);
+}
+
+static const struct file_operations ibm_cffps_fops = {
+	.llseek = noop_llseek,
+	.read = ibm_cffps_debugfs_op,
+	.open = simple_open,
+};
+
 static int ibm_cffps_read_byte_data(struct i2c_client *client, int page,
 				    int reg)
 {
@@ -105,6 +269,69 @@ 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)
+{
+	int rc;
+	struct ibm_cffps *psu = container_of(led_cdev, struct ibm_cffps, led);
+
+	if (brightness == LED_OFF) {
+		psu->led_state = CFFPS_LED_OFF;
+	} else {
+		brightness = LED_FULL;
+		if (psu->led_state != CFFPS_LED_BLINK)
+			psu->led_state = CFFPS_LED_ON;
+	}
+
+	rc = i2c_smbus_write_byte_data(psu->client, CFFPS_SYS_CONFIG_CMD,
+				       psu->led_state);
+	if (rc < 0)
+		return;
+
+	led_cdev->brightness = brightness;
+}
+
+static int ibm_cffps_led_blink_set(struct led_classdev *led_cdev,
+				   unsigned long *delay_on,
+				   unsigned long *delay_off)
+{
+	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;
+
+	rc = i2c_smbus_write_byte_data(psu->client, CFFPS_SYS_CONFIG_CMD,
+				       CFFPS_LED_BLINK);
+	if (rc < 0)
+		return rc;
+
+	*delay_on = CFFPS_BLINK_RATE_MS;
+	*delay_off = CFFPS_BLINK_RATE_MS;
+
+	return 0;
+}
+
+static void ibm_cffps_create_led_class(struct ibm_cffps *psu)
+{
+	int rc;
+	struct i2c_client *client = psu->client;
+	struct device *dev = &client->dev;
+
+	snprintf(psu->led_name, sizeof(psu->led_name), "%s-%02x", client->name,
+		 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.blink_set = ibm_cffps_led_blink_set;
+
+	rc = devm_led_classdev_register(dev, &psu->led);
+	if (rc)
+		dev_warn(dev, "failed to register led class: %d\n", rc);
+}
+
 static struct pmbus_driver_info ibm_cffps_info = {
 	.pages = 1,
 	.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
@@ -116,10 +343,69 @@ static struct pmbus_driver_info ibm_cffps_info = {
 	.read_word_data = ibm_cffps_read_word_data,
 };
 
+static struct pmbus_platform_data ibm_cffps_pdata = {
+	.flags = PMBUS_SKIP_STATUS_CHECK,
+};
+
 static int ibm_cffps_probe(struct i2c_client *client,
 			   const struct i2c_device_id *id)
 {
-	return pmbus_do_probe(client, id, &ibm_cffps_info);
+	int i, rc;
+	struct dentry *debugfs;
+	struct dentry *ibm_cffps_dir;
+	struct ibm_cffps *psu;
+
+	client->dev.platform_data = &ibm_cffps_pdata;
+	rc = pmbus_do_probe(client, id, &ibm_cffps_info);
+	if (rc)
+		return rc;
+
+	/*
+	 * Don't fail the probe if there isn't enough memory for leds and
+	 * debugfs.
+	 */
+	psu = devm_kzalloc(&client->dev, sizeof(*psu), GFP_KERNEL);
+	if (!psu)
+		return 0;
+
+	psu->client = client;
+	mutex_init(&psu->input_history.update_lock);
+	psu->input_history.last_update = jiffies - HZ;
+
+	ibm_cffps_create_led_class(psu);
+
+	/* Don't fail the probe if we can't create debugfs */
+	debugfs = pmbus_get_debugfs_dir(client);
+	if (!debugfs)
+		return 0;
+
+	ibm_cffps_dir = debugfs_create_dir(client->name, debugfs);
+	if (!ibm_cffps_dir)
+		return 0;
+
+	for (i = 0; i < CFFPS_DEBUGFS_NUM_ENTRIES; ++i)
+		psu->debugfs_entries[i] = i;
+
+	debugfs_create_file("input_history", 0444, ibm_cffps_dir,
+			    &psu->debugfs_entries[CFFPS_DEBUGFS_INPUT_HISTORY],
+			    &ibm_cffps_fops);
+	debugfs_create_file("fru", 0444, ibm_cffps_dir,
+			    &psu->debugfs_entries[CFFPS_DEBUGFS_FRU],
+			    &ibm_cffps_fops);
+	debugfs_create_file("part_number", 0444, ibm_cffps_dir,
+			    &psu->debugfs_entries[CFFPS_DEBUGFS_PN],
+			    &ibm_cffps_fops);
+	debugfs_create_file("serial_number", 0444, ibm_cffps_dir,
+			    &psu->debugfs_entries[CFFPS_DEBUGFS_SN],
+			    &ibm_cffps_fops);
+	debugfs_create_file("ccin", 0444, ibm_cffps_dir,
+			    &psu->debugfs_entries[CFFPS_DEBUGFS_CCIN],
+			    &ibm_cffps_fops);
+	debugfs_create_file("fw_version", 0444, ibm_cffps_dir,
+			    &psu->debugfs_entries[CFFPS_DEBUGFS_FW],
+			    &ibm_cffps_fops);
+
+	return 0;
 }
 
 static const struct i2c_device_id ibm_cffps_id[] = {

drivers/hwmon/pmbus/ir35221.c

@@ -25,168 +25,19 @@
 #define IR35221_MFR_IOUT_VALLEY		0xcb
 #define IR35221_MFR_TEMP_VALLEY		0xcc
 
-static long ir35221_reg2data(int data, enum pmbus_sensor_classes class)
-{
-	s16 exponent;
-	s32 mantissa;
-	long val;
-
-	/* We only modify LINEAR11 formats */
-	exponent = ((s16)data) >> 11;
-	mantissa = ((s16)((data & 0x7ff) << 5)) >> 5;
-
-	val = mantissa * 1000L;
-
-	/* scale result to micro-units for power sensors */
-	if (class == PSC_POWER)
-		val = val * 1000L;
-
-	if (exponent >= 0)
-		val <<= exponent;
-	else
-		val >>= -exponent;
-
-	return val;
-}
-
-#define MAX_MANTISSA	(1023 * 1000)
-#define MIN_MANTISSA	(511 * 1000)
-
-static u16 ir35221_data2reg(long val, enum pmbus_sensor_classes class)
-{
-	s16 exponent = 0, mantissa;
-	bool negative = false;
-
-	if (val == 0)
-		return 0;
-
-	if (val < 0) {
-		negative = true;
-		val = -val;
-	}
-
-	/* Power is in uW. Convert to mW before converting. */
-	if (class == PSC_POWER)
-		val = DIV_ROUND_CLOSEST(val, 1000L);
-
-	/* Reduce large mantissa until it fits into 10 bit */
-	while (val >= MAX_MANTISSA && exponent < 15) {
-		exponent++;
-		val >>= 1;
-	}
-	/* Increase small mantissa to improve precision */
-	while (val < MIN_MANTISSA && exponent > -15) {
-		exponent--;
-		val <<= 1;
-	}
-
-	/* Convert mantissa from milli-units to units */
-	mantissa = DIV_ROUND_CLOSEST(val, 1000);
-
-	/* Ensure that resulting number is within range */
-	if (mantissa > 0x3ff)
-		mantissa = 0x3ff;
-
-	/* restore sign */
-	if (negative)
-		mantissa = -mantissa;
-
-	/* Convert to 5 bit exponent, 11 bit mantissa */
-	return (mantissa & 0x7ff) | ((exponent << 11) & 0xf800);
-}
-
-static u16 ir35221_scale_result(s16 data, int shift,
-				enum pmbus_sensor_classes class)
-{
-	long val;
-
-	val = ir35221_reg2data(data, class);
-
-	if (shift < 0)
-		val >>= -shift;
-	else
-		val <<= shift;
-
-	return ir35221_data2reg(val, class);
-}
-
 static int ir35221_read_word_data(struct i2c_client *client, int page, int reg)
 {
 	int ret;
 
 	switch (reg) {
-	case PMBUS_IOUT_OC_FAULT_LIMIT:
-	case PMBUS_IOUT_OC_WARN_LIMIT:
-		ret = pmbus_read_word_data(client, page, reg);
-		if (ret < 0)
-			break;
-		ret = ir35221_scale_result(ret, 1, PSC_CURRENT_OUT);
-		break;
-	case PMBUS_VIN_OV_FAULT_LIMIT:
-	case PMBUS_VIN_OV_WARN_LIMIT:
-	case PMBUS_VIN_UV_WARN_LIMIT:
-		ret = pmbus_read_word_data(client, page, reg);
-		ret = ir35221_scale_result(ret, -4, PSC_VOLTAGE_IN);
-		break;
-	case PMBUS_IIN_OC_WARN_LIMIT:
-		ret = pmbus_read_word_data(client, page, reg);
-		if (ret < 0)
-			break;
-		ret = ir35221_scale_result(ret, -1, PSC_CURRENT_IN);
-		break;
-	case PMBUS_READ_VIN:
-		ret = pmbus_read_word_data(client, page, PMBUS_READ_VIN);
-		if (ret < 0)
-			break;
-		ret = ir35221_scale_result(ret, -5, PSC_VOLTAGE_IN);
-		break;
-	case PMBUS_READ_IIN:
-		ret = pmbus_read_word_data(client, page, PMBUS_READ_IIN);
-		if (ret < 0)
-			break;
-		if (page == 0)
-			ret = ir35221_scale_result(ret, -4, PSC_CURRENT_IN);
-		else
-			ret = ir35221_scale_result(ret, -5, PSC_CURRENT_IN);
-		break;
-	case PMBUS_READ_POUT:
-		ret = pmbus_read_word_data(client, page, PMBUS_READ_POUT);
-		if (ret < 0)
-			break;
-		ret = ir35221_scale_result(ret, -1, PSC_POWER);
-		break;
-	case PMBUS_READ_PIN:
-		ret = pmbus_read_word_data(client, page, PMBUS_READ_PIN);
-		if (ret < 0)
-			break;
-		ret = ir35221_scale_result(ret, -1, PSC_POWER);
-		break;
-	case PMBUS_READ_IOUT:
-		ret = pmbus_read_word_data(client, page, PMBUS_READ_IOUT);
-		if (ret < 0)
-			break;
-		if (page == 0)
-			ret = ir35221_scale_result(ret, -1, PSC_CURRENT_OUT);
-		else
-			ret = ir35221_scale_result(ret, -2, PSC_CURRENT_OUT);
-		break;
 	case PMBUS_VIRT_READ_VIN_MAX:
 		ret = pmbus_read_word_data(client, page, IR35221_MFR_VIN_PEAK);
-		if (ret < 0)
-			break;
-		ret = ir35221_scale_result(ret, -5, PSC_VOLTAGE_IN);
 		break;
 	case PMBUS_VIRT_READ_VOUT_MAX:
 		ret = pmbus_read_word_data(client, page, IR35221_MFR_VOUT_PEAK);
 		break;
 	case PMBUS_VIRT_READ_IOUT_MAX:
 		ret = pmbus_read_word_data(client, page, IR35221_MFR_IOUT_PEAK);
-		if (ret < 0)
-			break;
-		if (page == 0)
-			ret = ir35221_scale_result(ret, -1, PSC_CURRENT_IN);
-		else
-			ret = ir35221_scale_result(ret, -2, PSC_CURRENT_IN);
 		break;
 	case PMBUS_VIRT_READ_TEMP_MAX:
 		ret = pmbus_read_word_data(client, page, IR35221_MFR_TEMP_PEAK);
@@ -194,9 +45,6 @@ static int ir35221_read_word_data(struct i2c_client *client, int page, int reg)
 	case PMBUS_VIRT_READ_VIN_MIN:
 		ret = pmbus_read_word_data(client, page,
 					   IR35221_MFR_VIN_VALLEY);
-		if (ret < 0)
-			break;
-		ret = ir35221_scale_result(ret, -5, PSC_VOLTAGE_IN);
 		break;
 	case PMBUS_VIRT_READ_VOUT_MIN:
 		ret = pmbus_read_word_data(client, page,
@@ -205,12 +53,6 @@ static int ir35221_read_word_data(struct i2c_client *client, int page, int reg)
 	case PMBUS_VIRT_READ_IOUT_MIN:
 		ret = pmbus_read_word_data(client, page,
 					   IR35221_MFR_IOUT_VALLEY);
-		if (ret < 0)
-			break;
-		if (page == 0)
-			ret = ir35221_scale_result(ret, -1, PSC_CURRENT_IN);
-		else
-			ret = ir35221_scale_result(ret, -2, PSC_CURRENT_IN);
 		break;
 	case PMBUS_VIRT_READ_TEMP_MIN:
 		ret = pmbus_read_word_data(client, page,
@@ -224,36 +66,6 @@ static int ir35221_read_word_data(struct i2c_client *client, int page, int reg)
 	return ret;
 }
 
-static int ir35221_write_word_data(struct i2c_client *client, int page, int reg,
-				   u16 word)
-{
-	int ret;
-	u16 val;
-
-	switch (reg) {
-	case PMBUS_IOUT_OC_FAULT_LIMIT:
-	case PMBUS_IOUT_OC_WARN_LIMIT:
-		val = ir35221_scale_result(word, -1, PSC_CURRENT_OUT);
-		ret = pmbus_write_word_data(client, page, reg, val);
-		break;
-	case PMBUS_VIN_OV_FAULT_LIMIT:
-	case PMBUS_VIN_OV_WARN_LIMIT:
-	case PMBUS_VIN_UV_WARN_LIMIT:
-		val = ir35221_scale_result(word, 4, PSC_VOLTAGE_IN);
-		ret = pmbus_write_word_data(client, page, reg, val);
-		break;
-	case PMBUS_IIN_OC_WARN_LIMIT:
-		val = ir35221_scale_result(word, 1, PSC_CURRENT_IN);
-		ret = pmbus_write_word_data(client, page, reg, val);
-		break;
-	default:
-		ret = -ENODATA;
-		break;
-	}
-
-	return ret;
-}
-
 static int ir35221_probe(struct i2c_client *client,
 			 const struct i2c_device_id *id)
 {
@@ -292,7 +104,6 @@ static int ir35221_probe(struct i2c_client *client,
 	if (!info)
 		return -ENOMEM;
 
-	info->write_word_data = ir35221_write_word_data;
 	info->read_word_data = ir35221_read_word_data;
 
 	info->pages = 2;

drivers/hwmon/pmbus/lm25066.c

 /*
- * Hardware monitoring driver for LM25056 / LM25063 / LM25066 / LM5064 / LM5066
+ * Hardware monitoring driver for LM25056 / LM25066 / LM5064 / LM5066
  *
  * Copyright (c) 2011 Ericsson AB.
  * Copyright (c) 2013 Guenter Roeck
@@ -28,7 +28,7 @@
 #include <linux/i2c.h>
 #include "pmbus.h"
 
-enum chips { lm25056, lm25063, lm25066, lm5064, lm5066, lm5066i };
+enum chips { lm25056, lm25066, lm5064, lm5066, lm5066i };
 
 #define LM25066_READ_VAUX		0xd0
 #define LM25066_MFR_READ_IIN		0xd1
@@ -53,11 +53,6 @@ enum chips { lm25056, lm25063, lm25066, lm5064, lm5066, lm5066i };
 #define LM25056_MFR_STS_VAUX_OV_WARN	BIT(1)
 #define LM25056_MFR_STS_VAUX_UV_WARN	BIT(0)
 
-/* LM25063 only */
-
-#define LM25063_READ_VOUT_MAX		0xe5
-#define LM25063_READ_VOUT_MIN		0xe6
-
 struct __coeff {
 	short m, b, R;
 };
@@ -122,36 +117,6 @@ static struct __coeff lm25066_coeff[6][PSC_NUM_CLASSES + 2] = {
 			.m = 16,
 		},
 	},
-	[lm25063] = {
-		[PSC_VOLTAGE_IN] = {
-			.m = 16000,
-			.R = -2,
-		},
-		[PSC_VOLTAGE_OUT] = {
-			.m = 16000,
-			.R = -2,
-		},
-		[PSC_CURRENT_IN] = {
-			.m = 10000,
-			.R = -2,
-		},
-		[PSC_CURRENT_IN_L] = {
-			.m = 10000,
-			.R = -2,
-		},
-		[PSC_POWER] = {
-			.m = 5000,
-			.R = -3,
-		},
-		[PSC_POWER_L] = {
-			.m = 5000,
-			.R = -3,
-		},
-		[PSC_TEMPERATURE] = {
-			.m = 15596,
-			.R = -3,
-		},
-	},
 	[lm5064] = {
 		[PSC_VOLTAGE_IN] = {
 			.m = 4611,
@@ -272,10 +237,6 @@ static int lm25066_read_word_data(struct i2c_client *client, int page, int reg)
 			/* VIN: 6.14 mV VAUX: 293 uV LSB */
 			ret = DIV_ROUND_CLOSEST(ret * 293, 6140);
 			break;
-		case lm25063:
-			/* VIN: 6.25 mV VAUX: 200.0 uV LSB */
-			ret = DIV_ROUND_CLOSEST(ret * 20, 625);
-			break;
 		case lm25066:
 			/* VIN: 4.54 mV VAUX: 283.2 uV LSB */
 			ret = DIV_ROUND_CLOSEST(ret * 2832, 45400);
@@ -330,24 +291,6 @@ static int lm25066_read_word_data(struct i2c_client *client, int page, int reg)
 	return ret;
 }
 
-static int lm25063_read_word_data(struct i2c_client *client, int page, int reg)
-{
-	int ret;
-
-	switch (reg) {
-	case PMBUS_VIRT_READ_VOUT_MAX:
-		ret = pmbus_read_word_data(client, 0, LM25063_READ_VOUT_MAX);
-		break;
-	case PMBUS_VIRT_READ_VOUT_MIN:
-		ret = pmbus_read_word_data(client, 0, LM25063_READ_VOUT_MIN);
-		break;
-	default:
-		ret = lm25066_read_word_data(client, page, reg);
-		break;
-	}
-	return ret;
-}
-
 static int lm25056_read_word_data(struct i2c_client *client, int page, int reg)
 {
 	int ret;
@@ -502,11 +445,6 @@ static int lm25066_probe(struct i2c_client *client,
 		info->read_word_data = lm25056_read_word_data;
 		info->read_byte_data = lm25056_read_byte_data;
 		data->rlimit = 0x0fff;
-	} else if (data->id == lm25063) {
-		info->func[0] |= PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
-		  | PMBUS_HAVE_POUT;
-		info->read_word_data = lm25063_read_word_data;
-		data->rlimit = 0xffff;
 	} else {
 		info->func[0] |= PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
 		info->read_word_data = lm25066_read_word_data;
@@ -543,7 +481,6 @@ static int lm25066_probe(struct i2c_client *client,
 
 static const struct i2c_device_id lm25066_id[] = {
 	{"lm25056", lm25056},
-	{"lm25063", lm25063},
 	{"lm25066", lm25066},
 	{"lm5064", lm5064},
 	{"lm5066", lm5066},

drivers/hwmon/pmbus/max31785.c

@@ -16,12 +16,231 @@
 
 enum max31785_regs {
 	MFR_REVISION		= 0x9b,
+	MFR_FAN_CONFIG		= 0xf1,
 };
 
+#define MAX31785			0x3030
+#define MAX31785A			0x3040
+
+#define MFR_FAN_CONFIG_DUAL_TACH	BIT(12)
+
 #define MAX31785_NR_PAGES		23
+#define MAX31785_NR_FAN_PAGES		6
+
+static int max31785_read_byte_data(struct i2c_client *client, int page,
+				   int reg)
+{
+	if (page < MAX31785_NR_PAGES)
+		return -ENODATA;
+
+	switch (reg) {
+	case PMBUS_VOUT_MODE:
+		return -ENOTSUPP;
+	case PMBUS_FAN_CONFIG_12:
+		return pmbus_read_byte_data(client, page - MAX31785_NR_PAGES,
+					    reg);
+	}
+
+	return -ENODATA;
+}
+
+static int max31785_write_byte(struct i2c_client *client, int page, u8 value)
+{
+	if (page < MAX31785_NR_PAGES)
+		return -ENODATA;
+
+	return -ENOTSUPP;
+}
+
+static int max31785_read_long_data(struct i2c_client *client, int page,
+				   int reg, u32 *data)
+{
+	unsigned char cmdbuf[1];
+	unsigned char rspbuf[4];
+	int rc;
+
+	struct i2c_msg msg[2] = {
+		{
+			.addr = client->addr,
+			.flags = 0,
+			.len = sizeof(cmdbuf),
+			.buf = cmdbuf,
+		},
+		{
+			.addr = client->addr,
+			.flags = I2C_M_RD,
+			.len = sizeof(rspbuf),
+			.buf = rspbuf,
+		},
+	};
+
+	cmdbuf[0] = reg;
+
+	rc = pmbus_set_page(client, page);
+	if (rc < 0)
+		return rc;
+
+	rc = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
+	if (rc < 0)
+		return rc;
+
+	*data = (rspbuf[0] << (0 * 8)) | (rspbuf[1] << (1 * 8)) |
+		(rspbuf[2] << (2 * 8)) | (rspbuf[3] << (3 * 8));
+
+	return rc;
+}
+
+static int max31785_get_pwm(struct i2c_client *client, int page)
+{
+	int rv;
+
+	rv = pmbus_get_fan_rate_device(client, page, 0, percent);
+	if (rv < 0)
+		return rv;
+	else if (rv >= 0x8000)
+		return 0;
+	else if (rv >= 0x2711)
+		return 0x2710;
+
+	return rv;
+}
+
+static int max31785_get_pwm_mode(struct i2c_client *client, int page)
+{
+	int config;
+	int command;
+
+	config = pmbus_read_byte_data(client, page, PMBUS_FAN_CONFIG_12);
+	if (config < 0)
+		return config;
+
+	command = pmbus_read_word_data(client, page, PMBUS_FAN_COMMAND_1);
+	if (command < 0)
+		return command;
+
+	if (config & PB_FAN_1_RPM)
+		return (command >= 0x8000) ? 3 : 2;
+
+	if (command >= 0x8000)
+		return 3;
+	else if (command >= 0x2711)
+		return 0;
+
+	return 1;
+}
+
+static int max31785_read_word_data(struct i2c_client *client, int page,
+				   int reg)
+{
+	u32 val;
+	int rv;
+
+	switch (reg) {
+	case PMBUS_READ_FAN_SPEED_1:
+		if (page < MAX31785_NR_PAGES)
+			return -ENODATA;
+
+		rv = max31785_read_long_data(client, page - MAX31785_NR_PAGES,
+					     reg, &val);
+		if (rv < 0)
+			return rv;
+
+		rv = (val >> 16) & 0xffff;
+		break;
+	case PMBUS_FAN_COMMAND_1:
+		/*
+		 * PMBUS_FAN_COMMAND_x is probed to judge whether or not to
+		 * expose fan control registers.
+		 *
+		 * Don't expose fan_target attribute for virtual pages.
+		 */
+		rv = (page >= MAX31785_NR_PAGES) ? -ENOTSUPP : -ENODATA;
+		break;
+	case PMBUS_VIRT_PWM_1:
+		rv = max31785_get_pwm(client, page);
+		break;
+	case PMBUS_VIRT_PWM_ENABLE_1:
+		rv = max31785_get_pwm_mode(client, page);
+		break;
+	default:
+		rv = -ENODATA;
+		break;
+	}
+
+	return rv;
+}
+
+static inline u32 max31785_scale_pwm(u32 sensor_val)
+{
+	/*
+	 * The datasheet describes the accepted value range for manual PWM as
+	 * [0, 0x2710], while the hwmon pwmX sysfs interface accepts values in
+	 * [0, 255]. The MAX31785 uses DIRECT mode to scale the FAN_COMMAND
+	 * registers and in PWM mode the coefficients are m=1, b=0, R=2. The
+	 * important observation here is that 0x2710 == 10000 == 100 * 100.
+	 *
+	 * R=2 (== 10^2 == 100) accounts for scaling the value provided at the
+	 * sysfs interface into the required hardware resolution, but it does
+	 * not yet yield a value that we can write to the device (this initial
+	 * scaling is handled by pmbus_data2reg()). Multiplying by 100 below
+	 * translates the parameter value into the percentage units required by
+	 * PMBus, and then we scale back by 255 as required by the hwmon pwmX
+	 * interface to yield the percentage value at the appropriate
+	 * resolution for hardware.
+	 */
+	return (sensor_val * 100) / 255;
+}
+
+static int max31785_pwm_enable(struct i2c_client *client, int page,
+				    u16 word)
+{
+	int config = 0;
+	int rate;
+
+	switch (word) {
+	case 0:
+		rate = 0x7fff;
+		break;
+	case 1:
+		rate = pmbus_get_fan_rate_cached(client, page, 0, percent);
+		if (rate < 0)
+			return rate;
+		rate = max31785_scale_pwm(rate);
+		break;
+	case 2:
+		config = PB_FAN_1_RPM;
+		rate = pmbus_get_fan_rate_cached(client, page, 0, rpm);
+		if (rate < 0)
+			return rate;
+		break;
+	case 3:
+		rate = 0xffff;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return pmbus_update_fan(client, page, 0, config, PB_FAN_1_RPM, rate);
+}
+
+static int max31785_write_word_data(struct i2c_client *client, int page,
+				    int reg, u16 word)
+{
+	switch (reg) {
+	case PMBUS_VIRT_PWM_1:
+		return pmbus_update_fan(client, page, 0, 0, PB_FAN_1_RPM,
+					max31785_scale_pwm(word));
+	case PMBUS_VIRT_PWM_ENABLE_1:
+		return max31785_pwm_enable(client, page, word);
+	default:
+		break;
+	}
+
+	return -ENODATA;
+}
 
 #define MAX31785_FAN_FUNCS \
-	(PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12)
+	(PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12 | PMBUS_HAVE_PWM12)
 
 #define MAX31785_TEMP_FUNCS \
 	(PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP)
@@ -29,14 +248,26 @@ enum max31785_regs {
 #define MAX31785_VOUT_FUNCS \
 	(PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT)
 
+#define MAX37185_NUM_FAN_PAGES 6
+
 static const struct pmbus_driver_info max31785_info = {
 	.pages = MAX31785_NR_PAGES,
 
+	.write_word_data = max31785_write_word_data,
+	.read_byte_data = max31785_read_byte_data,
+	.read_word_data = max31785_read_word_data,
+	.write_byte = max31785_write_byte,
+
 	/* RPM */
 	.format[PSC_FAN] = direct,
 	.m[PSC_FAN] = 1,
 	.b[PSC_FAN] = 0,
 	.R[PSC_FAN] = 0,
+	/* PWM */
+	.format[PSC_PWM] = direct,
+	.m[PSC_PWM] = 1,
+	.b[PSC_PWM] = 0,
+	.R[PSC_PWM] = 2,
 	.func[0] = MAX31785_FAN_FUNCS,
 	.func[1] = MAX31785_FAN_FUNCS,
 	.func[2] = MAX31785_FAN_FUNCS,
@@ -72,13 +303,46 @@ static const struct pmbus_driver_info max31785_info = {
 	.func[22] = MAX31785_VOUT_FUNCS,
 };
 
+static int max31785_configure_dual_tach(struct i2c_client *client,
+					struct pmbus_driver_info *info)
+{
+	int ret;
+	int i;
+
+	for (i = 0; i < MAX31785_NR_FAN_PAGES; i++) {
+		ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, i);
+		if (ret < 0)
+			return ret;
+
+		ret = i2c_smbus_read_word_data(client, MFR_FAN_CONFIG);
+		if (ret < 0)
+			return ret;
+
+		if (ret & MFR_FAN_CONFIG_DUAL_TACH) {
+			int virtual = MAX31785_NR_PAGES + i;
+
+			info->pages = virtual + 1;
+			info->func[virtual] |= PMBUS_HAVE_FAN12;
+			info->func[virtual] |= PMBUS_PAGE_VIRTUAL;
+		}
+	}
+
+	return 0;
+}
+
 static int max31785_probe(struct i2c_client *client,
 			  const struct i2c_device_id *id)
 {
 	struct device *dev = &client->dev;
 	struct pmbus_driver_info *info;
+	bool dual_tach = false;
 	s64 ret;
 
+	if (!i2c_check_functionality(client->adapter,
+				     I2C_FUNC_SMBUS_BYTE_DATA |
+				     I2C_FUNC_SMBUS_WORD_DATA))
+		return -ENODEV;
+
 	info = devm_kzalloc(dev, sizeof(struct pmbus_driver_info), GFP_KERNEL);
 	if (!info)
 		return -ENOMEM;
@@ -89,6 +353,25 @@ static int max31785_probe(struct i2c_client *client,
 	if (ret < 0)
 		return ret;
 
+	ret = i2c_smbus_read_word_data(client, MFR_REVISION);
+	if (ret < 0)
+		return ret;
+
+	if (ret == MAX31785A) {
+		dual_tach = true;
+	} else if (ret == MAX31785) {
+		if (!strcmp("max31785a", id->name))
+			dev_warn(dev, "Expected max3175a, found max31785: cannot provide secondary tachometer readings\n");
+	} else {
+		return -ENODEV;
+	}
+
+	if (dual_tach) {
+		ret = max31785_configure_dual_tach(client, info);
+		if (ret < 0)
+			return ret;
+	}
+
 	return pmbus_do_probe(client, id, info);
 }
 
@@ -100,9 +383,18 @@ static const struct i2c_device_id max31785_id[] = {
 
 MODULE_DEVICE_TABLE(i2c, max31785_id);
 
+static const struct of_device_id max31785_of_match[] = {
+	{ .compatible = "maxim,max31785" },
+	{ .compatible = "maxim,max31785a" },
+	{ },
+};
+
+MODULE_DEVICE_TABLE(of, max31785_of_match);
+
 static struct i2c_driver max31785_driver = {
 	.driver = {
 		.name = "max31785",
+		.of_match_table = max31785_of_match,
 	},
 	.probe = max31785_probe,
 	.remove = pmbus_do_remove,

drivers/hwmon/pmbus/pmbus.h

@@ -190,6 +190,33 @@ enum pmbus_regs {
 	PMBUS_VIRT_VMON_UV_FAULT_LIMIT,
 	PMBUS_VIRT_VMON_OV_FAULT_LIMIT,
 	PMBUS_VIRT_STATUS_VMON,
+
+	/*
+	 * RPM and PWM Fan control
+	 *
+	 * Drivers wanting to expose PWM control must define the behaviour of
+	 * PMBUS_VIRT_PWM_[1-4] and PMBUS_VIRT_PWM_ENABLE_[1-4] in the
+	 * {read,write}_word_data callback.
+	 *
+	 * pmbus core provides a default implementation for
+	 * PMBUS_VIRT_FAN_TARGET_[1-4].
+	 *
+	 * TARGET, PWM and PWM_ENABLE members must be defined sequentially;
+	 * pmbus core uses the difference between the provided register and
+	 * it's _1 counterpart to calculate the FAN/PWM ID.
+	 */
+	PMBUS_VIRT_FAN_TARGET_1,
+	PMBUS_VIRT_FAN_TARGET_2,
+	PMBUS_VIRT_FAN_TARGET_3,
+	PMBUS_VIRT_FAN_TARGET_4,
+	PMBUS_VIRT_PWM_1,
+	PMBUS_VIRT_PWM_2,
+	PMBUS_VIRT_PWM_3,
+	PMBUS_VIRT_PWM_4,
+	PMBUS_VIRT_PWM_ENABLE_1,
+	PMBUS_VIRT_PWM_ENABLE_2,
+	PMBUS_VIRT_PWM_ENABLE_3,
+	PMBUS_VIRT_PWM_ENABLE_4,
 };
 
 /*
@@ -223,6 +250,8 @@ enum pmbus_regs {
 #define PB_FAN_1_RPM			BIT(6)
 #define PB_FAN_1_INSTALLED		BIT(7)
 
+enum pmbus_fan_mode { percent = 0, rpm };
+
 /*
  * STATUS_BYTE, STATUS_WORD (lower)
  */
@@ -313,6 +342,7 @@ enum pmbus_sensor_classes {
 	PSC_POWER,
 	PSC_TEMPERATURE,
 	PSC_FAN,
+	PSC_PWM,
 	PSC_NUM_CLASSES		/* Number of power sensor classes */
 };
 
@@ -339,6 +369,10 @@ enum pmbus_sensor_classes {
 #define PMBUS_HAVE_STATUS_FAN34	BIT(17)
 #define PMBUS_HAVE_VMON		BIT(18)
 #define PMBUS_HAVE_STATUS_VMON	BIT(19)
+#define PMBUS_HAVE_PWM12	BIT(20)
+#define PMBUS_HAVE_PWM34	BIT(21)
+
+#define PMBUS_PAGE_VIRTUAL	BIT(31)
 
 enum pmbus_data_format { linear = 0, direct, vid };
 enum vrm_version { vr11 = 0, vr12, vr13 };
@@ -421,5 +455,12 @@ int pmbus_do_probe(struct i2c_client *client, const struct i2c_device_id *id,
 int pmbus_do_remove(struct i2c_client *client);
 const struct pmbus_driver_info *pmbus_get_driver_info(struct i2c_client
 						      *client);
+int pmbus_get_fan_rate_device(struct i2c_client *client, int page, int id,
+			      enum pmbus_fan_mode mode);
+int pmbus_get_fan_rate_cached(struct i2c_client *client, int page, int id,
+			      enum pmbus_fan_mode mode);
+int pmbus_update_fan(struct i2c_client *client, int page, int id,
+		     u8 config, u8 mask, u16 command);
+struct dentry *pmbus_get_debugfs_dir(struct i2c_client *client);
 
 #endif /* PMBUS_H */

drivers/hwmon/sht15.c

@@ -179,6 +179,7 @@ struct sht15_data {
  * sht15_crc8() - compute crc8
  * @data:	sht15 specific data.
  * @value:	sht15 retrieved data.
+ * @len:	Length of retrieved data
  *
  * This implements section 2 of the CRC datasheet.
  */

drivers/hwmon/sht21.c

@@ -41,7 +41,7 @@
 
 /**
  * struct sht21 - SHT21 device specific data
- * @hwmon_dev: device registered with hwmon
+ * @client: I2C client device
  * @lock: mutex to protect measurement values
  * @last_update: time of last update (jiffies)
  * @temperature: cached temperature measurement value

drivers/hwmon/sht3x.c

@@ -732,6 +732,13 @@ static int sht3x_probe(struct i2c_client *client,
 	mutex_init(&data->i2c_lock);
 	mutex_init(&data->data_lock);
 
+	/*
+	 * An attempt to read limits register too early
+	 * causes a NACK response from the chip.
+	 * Waiting for an empirical delay of 500 us solves the issue.
+	 */
+	usleep_range(500, 600);
+
 	ret = limits_update(data);
 	if (ret)
 		return ret;

drivers/hwmon/w83773g.c

+/*
+ * Copyright (C) 2017 IBM Corp.
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Driver for the Nuvoton W83773G SMBus temperature sensor IC.
+ * Supported models: W83773G
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/err.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+
+/* W83773 has 3 channels */
+#define W83773_CHANNELS				3
+
+/* The W83773 registers */
+#define W83773_CONVERSION_RATE_REG_READ		0x04
+#define W83773_CONVERSION_RATE_REG_WRITE	0x0A
+#define W83773_MANUFACTURER_ID_REG		0xFE
+#define W83773_LOCAL_TEMP			0x00
+
+static const u8 W83773_STATUS[2] = { 0x02, 0x17 };
+
+static const u8 W83773_TEMP_LSB[2] = { 0x10, 0x25 };
+static const u8 W83773_TEMP_MSB[2] = { 0x01, 0x24 };
+
+static const u8 W83773_OFFSET_LSB[2] = { 0x12, 0x16 };
+static const u8 W83773_OFFSET_MSB[2] = { 0x11, 0x15 };
+
+/* this is the number of sensors in the device */
+static const struct i2c_device_id w83773_id[] = {
+	{ "w83773g" },
+	{ }
+};
+
+MODULE_DEVICE_TABLE(i2c, w83773_id);
+
+static const struct of_device_id w83773_of_match[] = {
+	{
+		.compatible = "nuvoton,w83773g"
+	},
+	{ },
+};
+MODULE_DEVICE_TABLE(of, w83773_of_match);
+
+static inline long temp_of_local(s8 reg)
+{
+	return reg * 1000;
+}
+
+static inline long temp_of_remote(s8 hb, u8 lb)
+{
+	return (hb << 3 | lb >> 5) * 125;
+}
+
+static int get_local_temp(struct regmap *regmap, long *val)
+{
+	unsigned int regval;
+	int ret;
+
+	ret = regmap_read(regmap, W83773_LOCAL_TEMP, &regval);
+	if (ret < 0)
+		return ret;
+
+	*val = temp_of_local(regval);
+	return 0;
+}
+
+static int get_remote_temp(struct regmap *regmap, int index, long *val)
+{
+	unsigned int regval_high;
+	unsigned int regval_low;
+	int ret;
+
+	ret = regmap_read(regmap, W83773_TEMP_MSB[index], &regval_high);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_read(regmap, W83773_TEMP_LSB[index], &regval_low);
+	if (ret < 0)
+		return ret;
+
+	*val = temp_of_remote(regval_high, regval_low);
+	return 0;
+}
+
+static int get_fault(struct regmap *regmap, int index, long *val)
+{
+	unsigned int regval;
+	int ret;
+
+	ret = regmap_read(regmap, W83773_STATUS[index], &regval);
+	if (ret < 0)
+		return ret;
+
+	*val = (regval & 0x04) >> 2;
+	return 0;
+}
+
+static int get_offset(struct regmap *regmap, int index, long *val)
+{
+	unsigned int regval_high;
+	unsigned int regval_low;
+	int ret;
+
+	ret = regmap_read(regmap, W83773_OFFSET_MSB[index], &regval_high);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_read(regmap, W83773_OFFSET_LSB[index], &regval_low);
+	if (ret < 0)
+		return ret;
+
+	*val = temp_of_remote(regval_high, regval_low);
+	return 0;
+}
+
+static int set_offset(struct regmap *regmap, int index, long val)
+{
+	int ret;
+	u8 high_byte;
+	u8 low_byte;
+
+	val = clamp_val(val, -127825, 127825);
+	/* offset value equals to (high_byte << 3 | low_byte >> 5) * 125 */
+	val /= 125;
+	high_byte = val >> 3;
+	low_byte = (val & 0x07) << 5;
+
+	ret = regmap_write(regmap, W83773_OFFSET_MSB[index], high_byte);
+	if (ret < 0)
+		return ret;
+
+	return regmap_write(regmap, W83773_OFFSET_LSB[index], low_byte);
+}
+
+static int get_update_interval(struct regmap *regmap, long *val)
+{
+	unsigned int regval;
+	int ret;
+
+	ret = regmap_read(regmap, W83773_CONVERSION_RATE_REG_READ, &regval);
+	if (ret < 0)
+		return ret;
+
+	*val = 16000 >> regval;
+	return 0;
+}
+
+static int set_update_interval(struct regmap *regmap, long val)
+{
+	int rate;
+
+	/*
+	 * For valid rates, interval can be calculated as
+	 *	interval = (1 << (8 - rate)) * 62.5;
+	 * Rounded rate is therefore
+	 *	rate = 8 - __fls(interval * 8 / (62.5 * 7));
+	 * Use clamp_val() to avoid overflows, and to ensure valid input
+	 * for __fls.
+	 */
+	val = clamp_val(val, 62, 16000) * 10;
+	rate = 8 - __fls((val * 8 / (625 * 7)));
+	return regmap_write(regmap, W83773_CONVERSION_RATE_REG_WRITE, rate);
+}
+
+static int w83773_read(struct device *dev, enum hwmon_sensor_types type,
+		       u32 attr, int channel, long *val)
+{
+	struct regmap *regmap = dev_get_drvdata(dev);
+
+	if (type == hwmon_chip) {
+		if (attr == hwmon_chip_update_interval)
+			return get_update_interval(regmap, val);
+		return -EOPNOTSUPP;
+	}
+
+	switch (attr) {
+	case hwmon_temp_input:
+		if (channel == 0)
+			return get_local_temp(regmap, val);
+		return get_remote_temp(regmap, channel - 1, val);
+	case hwmon_temp_fault:
+		return get_fault(regmap, channel - 1, val);
+	case hwmon_temp_offset:
+		return get_offset(regmap, channel - 1, val);
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static int w83773_write(struct device *dev, enum hwmon_sensor_types type,
+			u32 attr, int channel, long val)
+{
+	struct regmap *regmap = dev_get_drvdata(dev);
+
+	if (type == hwmon_chip && attr == hwmon_chip_update_interval)
+		return set_update_interval(regmap, val);
+
+	if (type == hwmon_temp && attr == hwmon_temp_offset)
+		return set_offset(regmap, channel - 1, val);
+
+	return -EOPNOTSUPP;
+}
+
+static umode_t w83773_is_visible(const void *data, enum hwmon_sensor_types type,
+				 u32 attr, int channel)
+{
+	switch (type) {
+	case hwmon_chip:
+		switch (attr) {
+		case hwmon_chip_update_interval:
+			return 0644;
+		}
+		break;
+	case hwmon_temp:
+		switch (attr) {
+		case hwmon_temp_input:
+		case hwmon_temp_fault:
+			return 0444;
+		case hwmon_temp_offset:
+			return 0644;
+		}
+		break;
+	default:
+		break;
+	}
+	return 0;
+}
+
+static const u32 w83773_chip_config[] = {
+	HWMON_C_REGISTER_TZ | HWMON_C_UPDATE_INTERVAL,
+	0
+};
+
+static const struct hwmon_channel_info w83773_chip = {
+	.type = hwmon_chip,
+	.config = w83773_chip_config,
+};
+
+static const u32 w83773_temp_config[] = {
+	HWMON_T_INPUT,
+	HWMON_T_INPUT | HWMON_T_FAULT | HWMON_T_OFFSET,
+	HWMON_T_INPUT | HWMON_T_FAULT | HWMON_T_OFFSET,
+	0
+};
+
+static const struct hwmon_channel_info w83773_temp = {
+	.type = hwmon_temp,
+	.config = w83773_temp_config,
+};
+
+static const struct hwmon_channel_info *w83773_info[] = {
+	&w83773_chip,
+	&w83773_temp,
+	NULL
+};
+
+static const struct hwmon_ops w83773_ops = {
+	.is_visible = w83773_is_visible,
+	.read = w83773_read,
+	.write = w83773_write,
+};
+
+static const struct hwmon_chip_info w83773_chip_info = {
+	.ops = &w83773_ops,
+	.info = w83773_info,
+};
+
+static const struct regmap_config w83773_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+};
+
+static int w83773_probe(struct i2c_client *client,
+			const struct i2c_device_id *id)
+{
+	struct device *dev = &client->dev;
+	struct device *hwmon_dev;
+	struct regmap *regmap;
+	int ret;
+
+	regmap = devm_regmap_init_i2c(client, &w83773_regmap_config);
+	if (IS_ERR(regmap)) {
+		dev_err(dev, "failed to allocate register map\n");
+		return PTR_ERR(regmap);
+	}
+
+	/* Set the conversion rate to 2 Hz */
+	ret = regmap_write(regmap, W83773_CONVERSION_RATE_REG_WRITE, 0x05);
+	if (ret < 0) {
+		dev_err(&client->dev, "error writing config rate register\n");
+		return ret;
+	}
+
+	i2c_set_clientdata(client, regmap);
+
+	hwmon_dev = devm_hwmon_device_register_with_info(dev,
+							 client->name,
+							 regmap,
+							 &w83773_chip_info,
+							 NULL);
+	return PTR_ERR_OR_ZERO(hwmon_dev);
+}
+
+static struct i2c_driver w83773_driver = {
+	.class = I2C_CLASS_HWMON,
+	.driver = {
+		.name	= "w83773g",
+		.of_match_table = of_match_ptr(w83773_of_match),
+	},
+	.probe = w83773_probe,
+	.id_table = w83773_id,
+};
+
+module_i2c_driver(w83773_driver);
+
+MODULE_AUTHOR("Lei YU <mine260309@gmail.com>");
+MODULE_DESCRIPTION("W83773G temperature sensor driver");
+MODULE_LICENSE("GPL");