[RFT PATCH] hwmon: Add support for currX_emergency and inX_emergency attributes

Some hardware monitoring chips support three alarm levels for current and
voltage measurements. Add support for currX_emergency and inX_emergency
attributes to support such chips.

Cc: Manaf Meethalavalappu Pallikunhi <[email protected]>
Signed-off-by: Guenter Roeck <[email protected]>
---
RFT: Waiting for an actual chip driver using the new attributes.

 Documentation/ABI/testing/sysfs-class-hwmon | 26 +++++++++++++++++++++
 Documentation/hwmon/sysfs-interface.rst     |  6 +++++
 drivers/hwmon/hwmon.c                       |  2 ++
 include/linux/hwmon.h                       |  4 ++++
 4 files changed, 38 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-class-hwmon b/Documentation/ABI/testing/sysfs-class-hwmon
index b185bdfc7186..42fd89305101 100644
--- a/Documentation/ABI/testing/sysfs-class-hwmon
+++ b/Documentation/ABI/testing/sysfs-class-hwmon
@@ -81,6 +81,18 @@ Description:
 		take drastic action such as power down or reset. At the very
 		least, it should report a fault.
 
+What:		/sys/class/hwmon/hwmonX/inY_emergency
+Description:
+		Voltage emergency max value.
+
+		Unit: millivolt
+
+		RW
+
+		If voltage reaches or exceeds this limit, the system is expected
+		to take drastic action such as immediate power down or reset.
+		At the very least, it should report a fault.
+
 What:		/sys/class/hwmon/hwmonX/inY_input
 Description:
 		Voltage input value.
@@ -647,6 +659,20 @@ Description:
 
 		RW
 
+What:		/sys/class/hwmon/hwmonX/currY_emergency
+Description:
+		Current emergency high value.
+
+		Unit: milliampere
+
+		RW
+
+		If a current reaches or exceeds this limit, the system is
+		expected to take drastic action such as immediate power down
+		or reset. At the very least, it should report a fault.
+
+What:		/sys/class/hwmon/hwmonX/inY_input
+
 What:		/sys/class/hwmon/hwmonX/currY_input
 Description:
 		Current input value
diff --git a/Documentation/hwmon/sysfs-interface.rst b/Documentation/hwmon/sysfs-interface.rst
index 94e1bbce172a..e8f2a12793af 100644
--- a/Documentation/hwmon/sysfs-interface.rst
+++ b/Documentation/hwmon/sysfs-interface.rst
@@ -127,6 +127,9 @@ Voltages
 `in[0-*]_crit`
 		Voltage critical max value.
 
+`in[0-*]_emergency`
+		Voltage emergency max value.
+
 `in[0-*]_input`
 		Voltage input value.
 
@@ -332,6 +335,9 @@ Currents
 `curr[1-*]_crit`
 		Current critical high value.
 
+`curr[1-*]_emergency`
+		Current emergency high value.
+
 `curr[1-*]_input`
 		Current input value.
 
diff --git a/drivers/hwmon/hwmon.c b/drivers/hwmon/hwmon.c
index 55a9a3ddd4aa..a07bfe7ac7db 100644
--- a/drivers/hwmon/hwmon.c
+++ b/drivers/hwmon/hwmon.c
@@ -621,6 +621,7 @@ static const char * const hwmon_in_attr_templates[] = {
 	[hwmon_in_max] = "in%d_max",
 	[hwmon_in_lcrit] = "in%d_lcrit",
 	[hwmon_in_crit] = "in%d_crit",
+	[hwmon_in_emergency] = "in%d_emergency",
 	[hwmon_in_average] = "in%d_average",
 	[hwmon_in_lowest] = "in%d_lowest",
 	[hwmon_in_highest] = "in%d_highest",
@@ -644,6 +645,7 @@ static const char * const hwmon_curr_attr_templates[] = {
 	[hwmon_curr_max] = "curr%d_max",
 	[hwmon_curr_lcrit] = "curr%d_lcrit",
 	[hwmon_curr_crit] = "curr%d_crit",
+	[hwmon_curr_emergency] = "curr%d_emergency",
 	[hwmon_curr_average] = "curr%d_average",
 	[hwmon_curr_lowest] = "curr%d_lowest",
 	[hwmon_curr_highest] = "curr%d_highest",
diff --git a/include/linux/hwmon.h b/include/linux/hwmon.h
index 77a6f2bffcba..2cd433966723 100644
--- a/include/linux/hwmon.h
+++ b/include/linux/hwmon.h
@@ -134,6 +134,7 @@ enum hwmon_in_attributes {
 	hwmon_in_max,
 	hwmon_in_lcrit,
 	hwmon_in_crit,
+	hwmon_in_emergency,
 	hwmon_in_average,
 	hwmon_in_lowest,
 	hwmon_in_highest,
@@ -156,6 +157,7 @@ enum hwmon_in_attributes {
 #define HWMON_I_MAX		BIT(hwmon_in_max)
 #define HWMON_I_LCRIT		BIT(hwmon_in_lcrit)
 #define HWMON_I_CRIT		BIT(hwmon_in_crit)
+#define HWMON_I_EMERGENCY	BIT(hwmon_in_emergency)
 #define HWMON_I_AVERAGE		BIT(hwmon_in_average)
 #define HWMON_I_LOWEST		BIT(hwmon_in_lowest)
 #define HWMON_I_HIGHEST		BIT(hwmon_in_highest)
@@ -178,6 +180,7 @@ enum hwmon_curr_attributes {
 	hwmon_curr_max,
 	hwmon_curr_lcrit,
 	hwmon_curr_crit,
+	hwmon_curr_emergency,
 	hwmon_curr_average,
 	hwmon_curr_lowest,
 	hwmon_curr_highest,
@@ -199,6 +202,7 @@ enum hwmon_curr_attributes {
 #define HWMON_C_MAX		BIT(hwmon_curr_max)
 #define HWMON_C_LCRIT		BIT(hwmon_curr_lcrit)
 #define HWMON_C_CRIT		BIT(hwmon_curr_crit)
+#define HWMON_C_EMERGENCY	BIT(hwmon_curr_emergency)
 #define HWMON_C_AVERAGE		BIT(hwmon_curr_average)
 #define HWMON_C_LOWEST		BIT(hwmon_curr_lowest)
 #define HWMON_C_HIGHEST		BIT(hwmon_curr_highest)
-- 
2.45.2