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Message-Id: <20220819120109.3857571-5-o.rempel@pengutronix.de>
Date: Fri, 19 Aug 2022 14:01:06 +0200
From: Oleksij Rempel <o.rempel@...gutronix.de>
To: Andrew Lunn <andrew@...n.ch>,
Heiner Kallweit <hkallweit1@...il.com>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Russell King <linux@...linux.org.uk>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Jonathan Corbet <corbet@....net>
Cc: Oleksij Rempel <o.rempel@...gutronix.de>, kernel@...gutronix.de,
linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
David Jander <david@...tonic.nl>
Subject: [PATCH net-next v1 4/7] net: pse-pd: add generic PSE driver
Add generic driver to support simple Power Sourcing Equipment without
automatic classification support.
This driver was tested on 10Bast-T1L switch with regulator based PoDL PSE.
Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
---
drivers/net/pse-pd/Kconfig | 11 +++
drivers/net/pse-pd/Makefile | 2 +
drivers/net/pse-pd/pse_generic.c | 146 +++++++++++++++++++++++++++++++
3 files changed, 159 insertions(+)
create mode 100644 drivers/net/pse-pd/pse_generic.c
diff --git a/drivers/net/pse-pd/Kconfig b/drivers/net/pse-pd/Kconfig
index 49c7f0bcff526..a804c9f1af2bc 100644
--- a/drivers/net/pse-pd/Kconfig
+++ b/drivers/net/pse-pd/Kconfig
@@ -9,3 +9,14 @@ menuconfig PSE_CONTROLLER
Generic Power Sourcing Equipment Controller support.
If unsure, say no.
+
+if PSE_CONTROLLER
+
+config PSE_GENERIC
+ tristate "Generic PSE driver"
+ help
+ This module provides support for simple Ethernet Power Sourcing
+ Equipment without automatic classification support. For example for
+ PoDL (802.3bu) specification.
+
+endif
diff --git a/drivers/net/pse-pd/Makefile b/drivers/net/pse-pd/Makefile
index cbb79fc2e2706..80ef39ad68f10 100644
--- a/drivers/net/pse-pd/Makefile
+++ b/drivers/net/pse-pd/Makefile
@@ -2,3 +2,5 @@
# Makefile for Linux PSE drivers
obj-$(CONFIG_PSE_CONTROLLER) += pse-core.o
+
+obj-$(CONFIG_PSE_GENERIC) += pse_generic.o
diff --git a/drivers/net/pse-pd/pse_generic.c b/drivers/net/pse-pd/pse_generic.c
new file mode 100644
index 0000000000000..f264d4d589f59
--- /dev/null
+++ b/drivers/net/pse-pd/pse_generic.c
@@ -0,0 +1,146 @@
+// SPDX-License-Identifier: GPL-2.0-only
+//
+// Driver for the Generic Ethernet Power Sourcing Equipment, without
+// auto classification support.
+//
+// Copyright (c) 2022 Pengutronix, Oleksij Rempel <kernel@...gutronix.de>
+//
+
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pse-pd/pse.h>
+#include <linux/regulator/consumer.h>
+
+struct gen_pse_priv {
+ struct pse_controller_dev pcdev;
+ struct regulator *ps; /*power source */
+ enum ethtool_podl_pse_admin_state admin_state;
+};
+
+static struct gen_pse_priv *to_gen_pse(struct pse_controller_dev *pcdev)
+{
+ return container_of(pcdev, struct gen_pse_priv, pcdev);
+}
+
+static int
+gen_pse_podl_get_admin_sate(struct pse_controller_dev *pcdev, unsigned long id)
+{
+ struct gen_pse_priv *priv = to_gen_pse(pcdev);
+
+ /* aPoDLPSEAdminState can be different to aPoDLPSEPowerDetectionStatus
+ * which is provided by the regulator.
+ */
+ return priv->admin_state;
+}
+
+static int
+gen_pse_podl_set_admin_control(struct pse_controller_dev *pcdev,
+ unsigned long id,
+ enum ethtool_podl_pse_admin_state state)
+{
+ struct gen_pse_priv *priv = to_gen_pse(pcdev);
+ int ret;
+
+ if (priv->admin_state == state)
+ goto set_state;
+
+ switch (state) {
+ case ETHTOOL_PODL_PSE_ADMIN_STATE_ENABLED:
+ ret = regulator_enable(priv->ps);
+ break;
+ case ETHTOOL_PODL_PSE_ADMIN_STATE_DISABLED:
+ ret = regulator_disable(priv->ps);
+ break;
+ default:
+ dev_err(pcdev->dev, "Unknown admin state %i\n", state);
+ ret = -ENOTSUPP;
+ }
+
+ if (ret)
+ return ret;
+
+set_state:
+ priv->admin_state = state;
+
+ return 0;
+}
+
+static int
+gen_pse_podl_get_pw_d_status(struct pse_controller_dev *pcdev, unsigned long id)
+{
+ struct gen_pse_priv *priv = to_gen_pse(pcdev);
+ int ret;
+
+ ret = regulator_is_enabled(priv->ps);
+ if (ret < 0)
+ return ret;
+
+ if (!ret)
+ return ETHTOOL_PODL_PSE_PW_D_STATUS_DISABLED;
+
+ return ETHTOOL_PODL_PSE_PW_D_STATUS_DELIVERING;
+}
+
+static const struct pse_control_ops gen_pse_ops = {
+ .get_podl_pse_admin_sate = gen_pse_podl_get_admin_sate,
+ .set_podl_pse_admin_control = gen_pse_podl_set_admin_control,
+ .get_podl_pse_pw_d_status = gen_pse_podl_get_pw_d_status,
+};
+
+static int
+gen_pse_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct gen_pse_priv *priv;
+ int ret;
+
+ priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ if (!pdev->dev.of_node)
+ return -ENOENT;
+
+ priv->ps = devm_regulator_get(dev, "ieee802.3-podl-pse");
+ if (IS_ERR(priv->ps)) {
+ dev_err(dev, "failed to get PSE regulator (%pe)\n", priv->ps);
+ return PTR_ERR(priv->ps);
+ }
+
+ platform_set_drvdata(pdev, priv);
+
+ priv->admin_state = ETHTOOL_PODL_PSE_ADMIN_STATE_DISABLED;
+
+ priv->pcdev.owner = THIS_MODULE;
+ priv->pcdev.ops = &gen_pse_ops;
+ priv->pcdev.dev = dev;
+ ret = devm_pse_controller_register(dev, &priv->pcdev);
+ if (ret) {
+ dev_err(dev, "failed to register PSE controller (%pe)\n",
+ ERR_PTR(ret));
+ return ret;
+ }
+
+ return 0;
+}
+
+static const struct of_device_id gen_pse_of_match[] = {
+ { .compatible = "ieee802.3-podl-pse-generic", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, gen_pse_of_match);
+
+static struct platform_driver gen_pse_driver = {
+ .probe = gen_pse_probe,
+ .driver = {
+ .name = "PSE Generic",
+ .of_match_table = of_match_ptr(gen_pse_of_match),
+ },
+};
+module_platform_driver(gen_pse_driver);
+
+MODULE_AUTHOR("Oleksij Rempel <kernel@...gutronix.de>");
+MODULE_DESCRIPTION("Generic Ethernet Power Sourcing Equipment");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:pse-generic");
--
2.30.2
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