hwmon: Driver for Maxim MAX6697 and compatibles

Add support for MAX6581, MAX6602, MAX6622, MAX6636, MAX6689, MAX6693,
MAX6694, MAX6697, MAX6698, and MAX6699 temperature sensors
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Jean Delvare <khali@linux-fr.org>

Documentation/devicetree/bindings/i2c/max6697.txt

+max6697 properties
+
+Required properties:
+- compatible:
+	Should be one of
+		maxim,max6581
+		maxim,max6602
+		maxim,max6622
+		maxim,max6636
+		maxim,max6689
+		maxim,max6693
+		maxim,max6694
+		maxim,max6697
+		maxim,max6698
+		maxim,max6699
+- reg: I2C address
+
+Optional properties:
+
+- smbus-timeout-disable
+	Set to disable SMBus timeout. If not specified, SMBus timeout will be
+	enabled.
+- extended-range-enable
+	Only valid for MAX6581. Set to enable extended temperature range.
+	Extended temperature will be disabled if not specified.
+- beta-compensation-enable
+	Only valid for MAX6693 and MX6694. Set to enable beta compensation on
+	remote temperature channel 1.
+	Beta compensation will be disabled if not specified.
+- alert-mask
+	Alert bit mask. Alert disabled for bits set.
+	Select bit 0 for local temperature, bit 1..7 for remote temperatures.
+	If not specified, alert will be enabled for all channels.
+- over-temperature-mask
+	Over-temperature bit mask. Over-temperature reporting disabled for
+	bits set.
+	Select bit 0 for local temperature, bit 1..7 for remote temperatures.
+	If not specified, over-temperature reporting will be enabled for all
+	channels.
+- resistance-cancellation
+	Boolean for all chips other than MAX6581. Set to enable resistance
+	cancellation on remote temperature channel 1.
+	For MAX6581, resistance cancellation enabled for all channels if
+	specified as boolean, otherwise as per bit mask specified.
+	Only supported for remote temperatures (bit 1..7).
+	If not specified, resistance cancellation will be disabled for all
+	channels.
+- transistor-ideality
+	For MAX6581 only. Two values; first is bit mask, second is ideality
+	select value as per MAX6581 data sheet. Select bit 1..7 for remote
+	channels.
+	Transistor ideality will be initialized to default (1.008) if not
+	specified.
+
+Example:
+
+temp-sensor@1a {
+	compatible = "maxim,max6697";
+	reg = <0x1a>;
+	smbus-timeout-disable;
+	resistance-cancellation;
+	alert-mask = <0x72>;
+	over-temperature-mask = <0x7f>;
+};

Documentation/hwmon/max6697

+Kernel driver max6697
+=====================
+
+Supported chips:
+  * Maxim MAX6581
+    Prefix: 'max6581'
+    Datasheet: http://datasheets.maximintegrated.com/en/ds/MAX6581.pdf
+  * Maxim MAX6602
+    Prefix: 'max6602'
+    Datasheet: http://datasheets.maximintegrated.com/en/ds/MAX6602.pdf
+  * Maxim MAX6622
+    Prefix: 'max6622'
+    Datasheet: http://datasheets.maximintegrated.com/en/ds/MAX6622.pdf
+  * Maxim MAX6636
+    Prefix: 'max6636'
+    Datasheet: http://datasheets.maximintegrated.com/en/ds/MAX6636.pdf
+  * Maxim MAX6689
+    Prefix: 'max6689'
+    Datasheet: http://datasheets.maximintegrated.com/en/ds/MAX6689.pdf
+  * Maxim MAX6693
+    Prefix: 'max6693'
+    Datasheet: http://datasheets.maximintegrated.com/en/ds/MAX6693.pdf
+  * Maxim MAX6694
+    Prefix: 'max6694'
+    Datasheet: http://datasheets.maximintegrated.com/en/ds/MAX6694.pdf
+  * Maxim MAX6697
+    Prefix: 'max6697'
+    Datasheet: http://datasheets.maximintegrated.com/en/ds/MAX6697.pdf
+  * Maxim MAX6698
+    Prefix: 'max6698'
+    Datasheet: http://datasheets.maximintegrated.com/en/ds/MAX6698.pdf
+  * Maxim MAX6699
+    Prefix: 'max6699'
+    Datasheet: http://datasheets.maximintegrated.com/en/ds/MAX6699.pdf
+
+Author:
+    Guenter Roeck <linux@roeck-us.net>
+
+Description
+-----------
+
+This driver implements support for several MAX6697 compatible temperature sensor
+chips. The chips support one local temperature sensor plus four, six, or seven
+remote temperature sensors. Remote temperature sensors are diode-connected
+thermal transitors, except for MAX6698 which supports three diode-connected
+thermal transistors plus three thermistors in addition to the local temperature
+sensor.
+
+The driver provides the following sysfs attributes. temp1 is the local (chip)
+temperature, temp[2..n] are remote temperatures. The actually supported
+per-channel attributes are chip type and channel dependent.
+
+tempX_input      RO temperature
+tempX_max        RW temperature maximum threshold
+tempX_max_alarm  RO temperature maximum threshold alarm
+tempX_crit       RW temperature critical threshold
+tempX_crit_alarm RO temperature critical threshold alarm
+tempX_fault      RO temperature diode fault (remote sensors only)

drivers/hwmon/Kconfig

@@ -854,6 +854,17 @@ config SENSORS_MAX6650
 	  This driver can also be built as a module.  If so, the module
 	  will be called max6650.
 
+config SENSORS_MAX6697
+	tristate "Maxim MAX6697 and compatibles"
+	depends on I2C
+	help
+	  If you say yes here you get support for MAX6581, MAX6602, MAX6622,
+	  MAX6636, MAX6689, MAX6693, MAX6694, MAX6697, MAX6698, and MAX6699
+	  temperature sensor chips.
+
+	  This driver can also be built as a module.  If so, the module
+	  will be called max6697.
+
 config SENSORS_MCP3021
 	tristate "Microchip MCP3021 and compatibles"
 	depends on I2C

drivers/hwmon/Makefile

@@ -99,6 +99,7 @@ obj-$(CONFIG_SENSORS_MAX197)	+= max197.o
 obj-$(CONFIG_SENSORS_MAX6639)	+= max6639.o
 obj-$(CONFIG_SENSORS_MAX6642)	+= max6642.o
 obj-$(CONFIG_SENSORS_MAX6650)	+= max6650.o
+obj-$(CONFIG_SENSORS_MAX6697)	+= max6697.o
 obj-$(CONFIG_SENSORS_MC13783_ADC)+= mc13783-adc.o
 obj-$(CONFIG_SENSORS_MCP3021)	+= mcp3021.o
 obj-$(CONFIG_SENSORS_NTC_THERMISTOR)	+= ntc_thermistor.o

include/linux/platform_data/max6697.h

+/*
+ * max6697.h
+ *     Copyright (c) 2012 Guenter Roeck <linux@roeck-us.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef MAX6697_H
+#define MAX6697_H
+
+#include <linux/types.h>
+
+/*
+ * For all bit masks:
+ * bit 0:    local temperature
+ * bit 1..7: remote temperatures
+ */
+struct max6697_platform_data {
+	bool smbus_timeout_disable;	/* set to disable SMBus timeouts */
+	bool extended_range_enable;	/* set to enable extended temp range */
+	bool beta_compensation;		/* set to enable beta compensation */
+	u8 alert_mask;			/* set bit to 1 to disable alert */
+	u8 over_temperature_mask;	/* set bit to 1 to disable */
+	u8 resistance_cancellation;	/* set bit to 0 to disable
+					 * bit mask for MAX6581,
+					 * boolean for other chips
+					 */
+	u8 ideality_mask;		/* set bit to 0 to disable */
+	u8 ideality_value;		/* transistor ideality as per
+					 * MAX6581 datasheet
+					 */
+};
+
+#endif /* MAX6697_H */