[PATCH v3 1/3] hwmon: pmbus: event notification with alarms

[Vincent Jardin via B4 Relay]

From: Vincent Jardin <vjardin@xxxxxxx>

Let's add an accessor for the hwmon class device the pmbus core
registered for an i2c_client. Export it with PMBUS so chip
drivers can call hwmon_notify_event() on per-sensor *_alarm
attributes from the driver's work items.

The needs: for boards when the chip's SMBALERT# pin is
not available for the CPU, pmbus_irq_setup() cannot deliver
poll(POLLPRI) wakes or udev change@... events on the inX_alarm
files. So the drivers can install a delayed_work-based polling
fallback (like the lm90 driver) that periodically reads STATUS_WORD
and calls hwmon_notify_event() on 0->1 transitions.

Signed-off-by: Vincent Jardin <vjardin@xxxxxxx>
---
 drivers/hwmon/pmbus/pmbus.h      | 1 +
 drivers/hwmon/pmbus/pmbus_core.c | 8 ++++++++
 2 files changed, 9 insertions(+)

diff --git a/drivers/hwmon/pmbus/pmbus.h b/drivers/hwmon/pmbus/pmbus.h
index 23e3eda58870..46ab056c0058 100644
--- a/drivers/hwmon/pmbus/pmbus.h
+++ b/drivers/hwmon/pmbus/pmbus.h
@@ -565,6 +565,7 @@ bool pmbus_check_word_register(struct i2c_client *client, int page, int reg);
 int pmbus_do_probe(struct i2c_client *client, struct pmbus_driver_info *info);
 const struct pmbus_driver_info *pmbus_get_driver_info(struct i2c_client
 						      *client);
+struct device *pmbus_get_hwmon_device(struct i2c_client *client);
 int pmbus_get_fan_rate_device(struct i2c_client *client, int page, int id,
 			      enum pmbus_fan_mode mode);
 int pmbus_get_fan_rate_cached(struct i2c_client *client, int page, int id,
diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c
index 3143b9e0316c..6ba00ad73297 100644
--- a/drivers/hwmon/pmbus/pmbus_core.c
+++ b/drivers/hwmon/pmbus/pmbus_core.c
@@ -695,6 +695,14 @@ const struct pmbus_driver_info *pmbus_get_driver_info(struct i2c_client *client)
 }
 EXPORT_SYMBOL_NS_GPL(pmbus_get_driver_info, "PMBUS");
 
+struct device *pmbus_get_hwmon_device(struct i2c_client *client)
+{
+	struct pmbus_data *data = i2c_get_clientdata(client);
+
+	return data->hwmon_dev;
+}
+EXPORT_SYMBOL_NS_GPL(pmbus_get_hwmon_device, "PMBUS");
+
 static int pmbus_get_status(struct i2c_client *client, int page, int reg)
 {
 	struct pmbus_data *data = i2c_get_clientdata(client);

-- 
2.43.0