hwmon: (pmbus/ltc2978) Explicit driver for LTC2978

Provide explicit driver for LTC2978 to enable support for minimum and peak
attributes. Remove ltc2978 chip id from generic pmbus driver.

Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Reviewed-by: Robert Coulson <robert.coulson@ericsson.com>

Documentation/hwmon/ltc2978

@@ -0,0 +1,78 @@
+Kernel driver ltc2978
+=====================
+
+Supported chips:
+  * Linear Technology LTC2978
+    Prefix: 'ltc2978'
+    Addresses scanned: -
+    Datasheet: http://cds.linear.com/docs/Datasheet/2978fa.pdf
+
+Author: Guenter Roeck <guenter.roeck@ericsson.com>
+
+
+Description
+-----------
+
+The LTC2978 is an octal power supply monitor, supervisor, sequencer and
+margin controller.
+
+
+Usage Notes
+-----------
+
+This driver does not probe for PMBus devices. You will have to instantiate
+devices explicitly.
+
+Example: the following commands will load the driver for an LTC2978 at address
+0x60 on I2C bus #1:
+
+# modprobe ltc2978
+# echo ltc2978 0x60 > /sys/bus/i2c/devices/i2c-1/new_device
+
+
+Sysfs attributes
+----------------
+
+in1_label		"vin"
+in1_input		Measured input voltage.
+in1_min			Minimum input voltage.
+in1_max			Maximum input voltage.
+in1_lcrit		Critical minimum input voltage.
+in1_crit		Critical maximum input voltage.
+in1_min_alarm		Input voltage low alarm.
+in1_max_alarm		Input voltage high alarm.
+in1_lcrit_alarm		Input voltage critical low alarm.
+in1_crit_alarm		Input voltage critical high alarm.
+in1_lowest		Lowest input voltage.
+in1_highest		Highest input voltage.
+in1_reset_history	Reset history. Writing into this attribute will reset
+			history for all attributes.
+
+in[2-9]_label		"vout[1-8]".
+in[2-9]_input		Measured output voltage.
+in[2-9]_min		Minimum output voltage.
+in[2-9]_max		Maximum output voltage.
+in[2-9]_lcrit		Critical minimum output voltage.
+in[2-9]_crit		Critical maximum output voltage.
+in[2-9]_min_alarm	Output voltage low alarm.
+in[2-9]_max_alarm	Output voltage high alarm.
+in[2-9]_lcrit_alarm	Output voltage critical low alarm.
+in[2-9]_crit_alarm	Output voltage critical high alarm.
+in[2-9]_lowest		Lowest output voltage.
+in[2-9]_highest		Lowest output voltage.
+in[2-9]_reset_history	Reset history. Writing into this attribute will reset
+			history for all attributes.
+
+temp1_input		Measured temperature.
+temp1_min		Mimimum temperature.
+temp1_max		Maximum temperature.
+temp1_lcrit		Critical low temperature.
+temp1_crit		Critical high temperature.
+temp1_min_alarm		Chip temperature low alarm.
+temp1_max_alarm		Chip temperature high alarm.
+temp1_lcrit_alarm	Chip temperature critical low alarm.
+temp1_crit_alarm	Chip temperature critical high alarm.
+temp1_lowest		Lowest measured temperature.
+temp1_highest		Highest measured temperature.
+temp1_reset_history	Reset history. Writing into this attribute will reset
+			history for all attributes.

Documentation/hwmon/pmbus

@@ -8,11 +8,6 @@ Supported chips:
     Addresses scanned: -
     Datasheet:
  http://archive.ericsson.net/service/internet/picov/get?DocNo=28701-EN/LZT146395
-  * Linear Technology LTC2978
-    Octal PMBus Power Supply Monitor and Controller
-    Prefix: 'ltc2978'
-    Addresses scanned: -
-    Datasheet: http://cds.linear.com/docs/Datasheet/2978fa.pdf
   * ON Semiconductor ADP4000, NCP4200, NCP4208
     Prefixes: 'adp4000', 'ncp4200', 'ncp4208'
     Addresses scanned: -

drivers/hwmon/pmbus/Kconfig

@@ -20,7 +20,7 @@ config SENSORS_PMBUS
 	help
 	  If you say yes here you get hardware monitoring support for generic
 	  PMBus devices, including but not limited to ADP4000, BMR450, BMR451,
-	  BMR453, BMR454, LTC2978, NCP4200, and NCP4208.
+	  BMR453, BMR454, NCP4200, and NCP4208.
 
 	  This driver can also be built as a module. If so, the module will
 	  be called pmbus.
@@ -46,6 +46,16 @@ config SENSORS_LM25066
 	  This driver can also be built as a module. If so, the module will
 	  be called lm25066.
 
+config SENSORS_LTC2978
+	tristate "Linear Technologies LTC2978"
+	default n
+	help
+	  If you say yes here you get hardware monitoring support for Linear
+	  Technology LTC2978.
+
+	  This driver can also be built as a module. If so, the module will
+	  be called ltc2978.
+
 config SENSORS_MAX16064
 	tristate "Maxim MAX16064"
 	default n

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_LM25066)	+= lm25066.o
+obj-$(CONFIG_SENSORS_LTC2978)	+= ltc2978.o
 obj-$(CONFIG_SENSORS_MAX16064)	+= max16064.o
 obj-$(CONFIG_SENSORS_MAX34440)	+= max34440.o
 obj-$(CONFIG_SENSORS_MAX8688)	+= max8688.o