netdev - [PATCH net-next 11/12] net: pse-pd: Add support for event reporting using devm_regulator_irq

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Message-Id: <20241002-feature_poe_port_prio-v1-11-787054f74ed5@bootlin.com>
Date: Wed, 02 Oct 2024 18:28:07 +0200
From: Kory Maincent <kory.maincent@...tlin.com>
To: Oleksij Rempel <o.rempel@...gutronix.de>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Jonathan Corbet <corbet@....net>, Donald Hunter <donald.hunter@...il.com>
Cc: Thomas Petazzoni <thomas.petazzoni@...tlin.com>, 
 linux-kernel@...r.kernel.org, netdev@...r.kernel.org, 
 linux-doc@...r.kernel.org, Kyle Swenson <kyle.swenson@....tech>, 
 Dent Project <dentproject@...uxfoundation.org>, kernel@...gutronix.de, 
 Kory Maincent <kory.maincent@...tlin.com>
Subject: [PATCH net-next 11/12] net: pse-pd: Add support for event
 reporting using devm_regulator_irq_helper

From: Kory Maincent (Dent Project) <kory.maincent@...tlin.com>

Add support for devm_pse_irq_helper(), a wrapper for
devm_regulator_irq_helper(). This aims to report events such as
over-current or over-temperature conditions similarly to how the regulator
API handles them. Additionally, this patch introduces several define
wrappers to keep regulator naming conventions out of PSE drivers.

Signed-off-by: Kory Maincent <kory.maincent@...tlin.com>
---
 drivers/net/pse-pd/pse_core.c | 32 +++++++++++++++++++++++++++++++-
 include/linux/pse-pd/pse.h    | 24 ++++++++++++++++++++++++
 2 files changed, 55 insertions(+), 1 deletion(-)

diff --git a/drivers/net/pse-pd/pse_core.c b/drivers/net/pse-pd/pse_core.c
index d365fb7c8a98..a9f102507f5e 100644
--- a/drivers/net/pse-pd/pse_core.c
+++ b/drivers/net/pse-pd/pse_core.c
@@ -8,7 +8,6 @@
 #include <linux/device.h>
 #include <linux/of.h>
 #include <linux/pse-pd/pse.h>
-#include <linux/regulator/driver.h>
 #include <linux/regulator/machine.h>
 
 static DEFINE_MUTEX(pse_list_mutex);
@@ -536,6 +535,37 @@ int devm_pse_controller_register(struct device *dev,
 }
 EXPORT_SYMBOL_GPL(devm_pse_controller_register);
 
+int devm_pse_irq_helper(struct pse_controller_dev *pcdev, int irq,
+			int irq_flags, int supported_errs,
+			const struct pse_irq_desc *d)
+{
+	struct regulator_dev **rdevs;
+	void *irq_helper;
+	int i;
+
+	rdevs = devm_kcalloc(pcdev->dev, pcdev->nr_lines,
+			     sizeof(struct regulator_dev *), GFP_KERNEL);
+	if (!rdevs)
+		return -ENOMEM;
+
+	for (i = 0; i < pcdev->nr_lines; i++)
+		rdevs[i] = pcdev->pi[i].rdev;
+
+	/* Register notifiers - can fail if IRQ is not given */
+	irq_helper = devm_regulator_irq_helper(pcdev->dev, d, irq,
+					       0, supported_errs, NULL,
+					       &rdevs[0], pcdev->nr_lines);
+	if (IS_ERR(irq_helper)) {
+		if (PTR_ERR(irq_helper) == -EPROBE_DEFER)
+			return -EPROBE_DEFER;
+
+		dev_warn(pcdev->dev, "IRQ disabled %pe\n", irq_helper);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(devm_pse_irq_helper);
+
 /* PSE control section */
 
 static void __pse_control_release(struct kref *kref)
diff --git a/include/linux/pse-pd/pse.h b/include/linux/pse-pd/pse.h
index b60fc56923bd..ba3d6630d768 100644
--- a/include/linux/pse-pd/pse.h
+++ b/include/linux/pse-pd/pse.h
@@ -8,6 +8,7 @@
 #include <linux/ethtool.h>
 #include <linux/list.h>
 #include <uapi/linux/ethtool.h>
+#include <linux/regulator/driver.h>
 
 /* Maximum current in uA according to IEEE 802.3-2022 Table 145-1 */
 #define MAX_PI_CURRENT 1920000
@@ -15,6 +16,26 @@
 struct phy_device;
 struct pse_controller_dev;
 
+/* structure and define wrappers from PSE to regulator */
+#define pse_irq_desc regulator_irq_desc
+#define pse_irq_data regulator_irq_data
+#define pse_err_data regulator_err_data
+#define pse_err_state regulator_err_state
+
+#define PSE_EVENT_TABLE(event)	REGULATOR_EVENT_##event
+#define PSE_ERROR_TABLE(error)	REGULATOR_ERROR_##error
+
+#define PSE_EVENT_OVER_CURRENT		PSE_EVENT_TABLE(OVER_CURRENT)
+#define PSE_EVENT_OVER_TEMP		PSE_EVENT_TABLE(OVER_TEMP)
+
+#define PSE_ERROR_OVER_CURRENT		PSE_ERROR_TABLE(OVER_CURRENT)
+#define PSE_ERROR_OVER_TEMP		PSE_ERROR_TABLE(OVER_TEMP)
+
+/* Return values for PSE IRQ helpers */
+#define PSE_ERROR_CLEARED	PSE_ERROR_TABLE(CLEARED)
+#define PSE_FAILED_RETRY	REGULATOR_FAILED_RETRY
+#define PSE_ERROR_ON		PSE_ERROR_TABLE(ON)
+
 /**
  * struct pse_control_config - PSE control/channel configuration.
  *
@@ -180,6 +201,9 @@ void pse_controller_unregister(struct pse_controller_dev *pcdev);
 struct device;
 int devm_pse_controller_register(struct device *dev,
 				 struct pse_controller_dev *pcdev);
+int devm_pse_irq_helper(struct pse_controller_dev *pcdev, int irq,
+			int irq_flags, int supported_errs,
+			const struct pse_irq_desc *d);
 
 struct pse_control *of_pse_control_get(struct device_node *node);
 void pse_control_put(struct pse_control *psec);

-- 
2.34.1