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hwmon: (mcp9982) Add external diode fault read

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Add external diode fault read capability to the
MCP998X/33 and MCP998XD/33D driver.

Signed-off-by: Victor Duicu <victor.duicu@microchip.com>
Link: https://lore.kernel.org/r/20260423-add-external-diode-fault-read-v2-1-4004bb5f7d55@microchip.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Victor Duicu 2026-04-23 13:56:40 +03:00 committed by Guenter Roeck
parent 42ef8bb116
commit dca421c6ef
1 changed files with 20 additions and 5 deletions
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25
drivers/hwmon/mcp9982.c
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@ -92,19 +92,19 @@ static const struct hwmon_channel_info * const mcp9985_info[] = {
HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_MIN |
HWMON_T_MIN_ALARM | HWMON_T_MAX | HWMON_T_MAX_ALARM |
HWMON_T_MAX_HYST | HWMON_T_CRIT | HWMON_T_CRIT_ALARM |
HWMON_T_CRIT_HYST,
HWMON_T_CRIT_HYST | HWMON_T_FAULT,
HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_MIN |
HWMON_T_MIN_ALARM | HWMON_T_MAX | HWMON_T_MAX_ALARM |
HWMON_T_MAX_HYST | HWMON_T_CRIT | HWMON_T_CRIT_ALARM |
HWMON_T_CRIT_HYST,
HWMON_T_CRIT_HYST | HWMON_T_FAULT,
HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_MIN |
HWMON_T_MIN_ALARM | HWMON_T_MAX | HWMON_T_MAX_ALARM |
HWMON_T_MAX_HYST | HWMON_T_CRIT | HWMON_T_CRIT_ALARM |
HWMON_T_CRIT_HYST,
HWMON_T_CRIT_HYST | HWMON_T_FAULT,
HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_MIN |
HWMON_T_MIN_ALARM | HWMON_T_MAX | HWMON_T_MAX_ALARM |
HWMON_T_MAX_HYST | HWMON_T_CRIT | HWMON_T_CRIT_ALARM |
HWMON_T_CRIT_HYST),
HWMON_T_CRIT_HYST | HWMON_T_FAULT),
HWMON_CHANNEL_INFO(chip,
HWMON_C_UPDATE_INTERVAL),
NULL
@ -369,7 +369,8 @@ static int mcp9982_read(struct device *dev, enum hwmon_sensor_types type, u32 at
/*
* In Standby State the conversion cycle must be initated manually in
* order to read fresh temperature values and the status of the alarms.
* order to read fresh temperature values, the status of the alarms and
* fault information.
*/
if (!priv->run_state) {
switch (type) {
@ -379,6 +380,7 @@ static int mcp9982_read(struct device *dev, enum hwmon_sensor_types type, u32 at
case hwmon_temp_max_alarm:
case hwmon_temp_min_alarm:
case hwmon_temp_crit_alarm:
case hwmon_temp_fault:
ret = regmap_write(priv->regmap, MCP9982_ONE_SHOT_ADDR, 1);
if (ret)
return ret;
@ -402,6 +404,11 @@ static int mcp9982_read(struct device *dev, enum hwmon_sensor_types type, u32 at
}
switch (type) {
/*
* Because the ALERT/THERM pin is set in Therm(Comparator) mode,
* the external diode fault status, high limit status and low
* limit status registers do not clear the bits after reading.
*/
case hwmon_temp:
switch (attr) {
case hwmon_temp_input:
@ -510,6 +517,13 @@ static int mcp9982_read(struct device *dev, enum hwmon_sensor_types type, u32 at
*val -= hyst * 1000;
return 0;
case hwmon_temp_fault:
*val = regmap_test_bits(priv->regmap, MCP9982_EXT_FAULT_STATUS_ADDR,
BIT(channel));
if (*val < 0)
return *val;
return 0;
default:
return -EINVAL;
@ -681,6 +695,7 @@ static umode_t mcp9982_is_visible(const void *_data, enum hwmon_sensor_types typ
case hwmon_temp_max_alarm:
case hwmon_temp_max_hyst:
case hwmon_temp_crit_alarm:
case hwmon_temp_fault:
return 0444;
case hwmon_temp_min:
case hwmon_temp_max: