hwmon: (pmbus/core) Add regulator event support

Add regulator events corresponding to regulator error in regulator flag
map.
Also capture the same in pmbus_regulator_get_flags.

Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Signed-off-by: Naresh Solanki <Naresh.Solanki@9elements.com>
Link: https://lore.kernel.org/r/20230328150335.90238-2-Naresh.Solanki@9elements.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

Author: PatrickRudolph

drivers/hwmon/pmbus/pmbus_core.c

@@ -2693,9 +2693,9 @@ static int pmbus_init_common(struct i2c_client *client, struct pmbus_data *data,
 	return 0;
 }
 
-/* A PMBus status flag and the corresponding REGULATOR_ERROR_* flag */
+/* A PMBus status flag and the corresponding REGULATOR_ERROR_* and REGULATOR_EVENTS_* flag */
 struct pmbus_status_assoc {
-	int pflag, rflag;
+	int pflag, rflag, eflag;
 };
 
 /* PMBus->regulator bit mappings for a PMBus status register */
@@ -2710,27 +2710,36 @@ static const struct pmbus_status_category __maybe_unused pmbus_status_flag_map[]
 		.func = PMBUS_HAVE_STATUS_VOUT,
 		.reg = PMBUS_STATUS_VOUT,
 		.bits = (const struct pmbus_status_assoc[]) {
-			{ PB_VOLTAGE_UV_WARNING, REGULATOR_ERROR_UNDER_VOLTAGE_WARN },
-			{ PB_VOLTAGE_UV_FAULT,   REGULATOR_ERROR_UNDER_VOLTAGE },
-			{ PB_VOLTAGE_OV_WARNING, REGULATOR_ERROR_OVER_VOLTAGE_WARN },
-			{ PB_VOLTAGE_OV_FAULT,   REGULATOR_ERROR_REGULATION_OUT },
+			{ PB_VOLTAGE_UV_WARNING, REGULATOR_ERROR_UNDER_VOLTAGE_WARN,
+			REGULATOR_EVENT_UNDER_VOLTAGE_WARN },
+			{ PB_VOLTAGE_UV_FAULT,   REGULATOR_ERROR_UNDER_VOLTAGE,
+			REGULATOR_EVENT_UNDER_VOLTAGE },
+			{ PB_VOLTAGE_OV_WARNING, REGULATOR_ERROR_OVER_VOLTAGE_WARN,
+			REGULATOR_EVENT_OVER_VOLTAGE_WARN },
+			{ PB_VOLTAGE_OV_FAULT,   REGULATOR_ERROR_REGULATION_OUT,
+			REGULATOR_EVENT_OVER_VOLTAGE_WARN },
 			{ },
 		},
 	}, {
 		.func = PMBUS_HAVE_STATUS_IOUT,
 		.reg = PMBUS_STATUS_IOUT,
 		.bits = (const struct pmbus_status_assoc[]) {
-			{ PB_IOUT_OC_WARNING,    REGULATOR_ERROR_OVER_CURRENT_WARN },
-			{ PB_IOUT_OC_FAULT,      REGULATOR_ERROR_OVER_CURRENT },
-			{ PB_IOUT_OC_LV_FAULT,   REGULATOR_ERROR_OVER_CURRENT },
+			{ PB_IOUT_OC_WARNING,   REGULATOR_ERROR_OVER_CURRENT_WARN,
+			REGULATOR_EVENT_OVER_CURRENT_WARN },
+			{ PB_IOUT_OC_FAULT,     REGULATOR_ERROR_OVER_CURRENT,
+			REGULATOR_EVENT_OVER_CURRENT },
+			{ PB_IOUT_OC_LV_FAULT,  REGULATOR_ERROR_OVER_CURRENT,
+			REGULATOR_EVENT_OVER_CURRENT },
 			{ },
 		},
 	}, {
 		.func = PMBUS_HAVE_STATUS_TEMP,
 		.reg = PMBUS_STATUS_TEMPERATURE,
 		.bits = (const struct pmbus_status_assoc[]) {
-			{ PB_TEMP_OT_WARNING,    REGULATOR_ERROR_OVER_TEMP_WARN },
-			{ PB_TEMP_OT_FAULT,      REGULATOR_ERROR_OVER_TEMP },
+			{ PB_TEMP_OT_WARNING,    REGULATOR_ERROR_OVER_TEMP_WARN,
+			REGULATOR_EVENT_OVER_TEMP_WARN },
+			{ PB_TEMP_OT_FAULT,      REGULATOR_ERROR_OVER_TEMP,
+			REGULATOR_EVENT_OVER_TEMP },
 			{ },
 		},
 	},
@@ -2790,7 +2799,7 @@ static void pmbus_notify(struct pmbus_data *data, int page, int reg, int flags)
 }
 
 static int _pmbus_get_flags(struct pmbus_data *data, u8 page, unsigned int *flags,
-			    bool notify)
+			   unsigned int *event, bool notify)
 {
 	int i, status;
 	const struct pmbus_status_category *cat;
@@ -2800,6 +2809,7 @@ static int _pmbus_get_flags(struct pmbus_data *data, u8 page, unsigned int *flag
 	int func = data->info->func[page];
 
 	*flags = 0;
+	*event = 0;
 
 	for (i = 0; i < ARRAY_SIZE(pmbus_status_flag_map); i++) {
 		cat = &pmbus_status_flag_map[i];
@@ -2810,10 +2820,11 @@ static int _pmbus_get_flags(struct pmbus_data *data, u8 page, unsigned int *flag
 		if (status < 0)
 			return status;
 
-		for (bit = cat->bits; bit->pflag; bit++) {
-			if (status & bit->pflag)
+		for (bit = cat->bits; bit->pflag; bit++)
+			if (status & bit->pflag) {
 				*flags |= bit->rflag;
-		}
+				*event |= bit->eflag;
+			}
 
 		if (notify && status)
 			pmbus_notify(data, page, cat->reg, status);
@@ -2834,40 +2845,51 @@ static int _pmbus_get_flags(struct pmbus_data *data, u8 page, unsigned int *flag
 		return status;
 
 	if (_pmbus_is_enabled(dev, page)) {
-		if (status & PB_STATUS_OFF)
+		if (status & PB_STATUS_OFF) {
 			*flags |= REGULATOR_ERROR_FAIL;
+			*event |= REGULATOR_EVENT_FAIL;
+		}
 
-		if (status & PB_STATUS_POWER_GOOD_N)
+		if (status & PB_STATUS_POWER_GOOD_N) {
 			*flags |= REGULATOR_ERROR_REGULATION_OUT;
+			*event |= REGULATOR_EVENT_REGULATION_OUT;
+		}
 	}
 	/*
 	 * Unlike most other status bits, PB_STATUS_{IOUT_OC,VOUT_OV} are
 	 * defined strictly as fault indicators (not warnings).
 	 */
-	if (status & PB_STATUS_IOUT_OC)
+	if (status & PB_STATUS_IOUT_OC) {
 		*flags |= REGULATOR_ERROR_OVER_CURRENT;
-	if (status & PB_STATUS_VOUT_OV)
+		*event |= REGULATOR_EVENT_OVER_CURRENT;
+	}
+	if (status & PB_STATUS_VOUT_OV) {
 		*flags |= REGULATOR_ERROR_REGULATION_OUT;
+		*event |= REGULATOR_EVENT_FAIL;
+	}
 
 	/*
 	 * If we haven't discovered any thermal faults or warnings via
 	 * PMBUS_STATUS_TEMPERATURE, map PB_STATUS_TEMPERATURE to a warning as
 	 * a (conservative) best-effort interpretation.
 	 */
 	if (!(*flags & (REGULATOR_ERROR_OVER_TEMP | REGULATOR_ERROR_OVER_TEMP_WARN)) &&
-	    (status & PB_STATUS_TEMPERATURE))
+	    (status & PB_STATUS_TEMPERATURE)) {
 		*flags |= REGULATOR_ERROR_OVER_TEMP_WARN;
+		*event |= REGULATOR_EVENT_OVER_TEMP_WARN;
+	}
+
 
 	return 0;
 }
 
 static int __maybe_unused pmbus_get_flags(struct pmbus_data *data, u8 page, unsigned int *flags,
-					  bool notify)
+					  unsigned int *event, bool notify)
 {
 	int ret;
 
 	mutex_lock(&data->update_lock);
-	ret = _pmbus_get_flags(data, page, flags, notify);
+	ret = _pmbus_get_flags(data, page, flags, event, notify);
 	mutex_unlock(&data->update_lock);
 
 	return ret;
@@ -2911,8 +2933,9 @@ static int pmbus_regulator_get_error_flags(struct regulator_dev *rdev, unsigned
 	struct device *dev = rdev_get_dev(rdev);
 	struct i2c_client *client = to_i2c_client(dev->parent);
 	struct pmbus_data *data = i2c_get_clientdata(client);
+	int event;
 
-	return pmbus_get_flags(data, rdev_get_id(rdev), flags, false);
+	return pmbus_get_flags(data, rdev_get_id(rdev), flags, &event, false);
 }
 
 static int pmbus_regulator_get_status(struct regulator_dev *rdev)
@@ -3152,10 +3175,11 @@ static irqreturn_t pmbus_fault_handler(int irq, void *pdata)
 {
 	struct pmbus_data *data = pdata;
 	struct i2c_client *client = to_i2c_client(data->dev);
-	int i, status;
+
+	int i, status, event;
 	mutex_lock(&data->update_lock);
 	for (i = 0; i < data->info->pages; i++)
-		_pmbus_get_flags(data, i, &status, true);
+		_pmbus_get_flags(data, i, &status, &event, true);
 
 	pmbus_clear_faults(client);
 	mutex_unlock(&data->update_lock);