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-rw-r--r--drivers/net/pse-pd/Kconfig23
-rw-r--r--drivers/net/pse-pd/Makefile6
-rw-r--r--drivers/net/pse-pd/pse_core.c314
-rw-r--r--drivers/net/pse-pd/pse_regulator.c147
4 files changed, 490 insertions, 0 deletions
diff --git a/drivers/net/pse-pd/Kconfig b/drivers/net/pse-pd/Kconfig
new file mode 100644
index 0000000000..687dec49c1
--- /dev/null
+++ b/drivers/net/pse-pd/Kconfig
@@ -0,0 +1,23 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Ethernet Power Sourcing Equipment drivers
+#
+
+menuconfig PSE_CONTROLLER
+ bool "Ethernet Power Sourcing Equipment Support"
+ help
+ Generic Power Sourcing Equipment Controller support.
+
+ If unsure, say no.
+
+if PSE_CONTROLLER
+
+config PSE_REGULATOR
+ tristate "Regulator based PSE controller"
+ depends on REGULATOR || COMPILE_TEST
+ help
+ This module provides support for simple regulator based Ethernet Power
+ Sourcing Equipment without automatic classification support. For
+ example for basic implementation of PoDL (802.3bu) specification.
+
+endif
diff --git a/drivers/net/pse-pd/Makefile b/drivers/net/pse-pd/Makefile
new file mode 100644
index 0000000000..1b8aa4c70f
--- /dev/null
+++ b/drivers/net/pse-pd/Makefile
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0-only
+# Makefile for Linux PSE drivers
+
+obj-$(CONFIG_PSE_CONTROLLER) += pse_core.o
+
+obj-$(CONFIG_PSE_REGULATOR) += pse_regulator.o
diff --git a/drivers/net/pse-pd/pse_core.c b/drivers/net/pse-pd/pse_core.c
new file mode 100644
index 0000000000..146b81f08a
--- /dev/null
+++ b/drivers/net/pse-pd/pse_core.c
@@ -0,0 +1,314 @@
+// SPDX-License-Identifier: GPL-2.0-only
+//
+// Framework for Ethernet Power Sourcing Equipment
+//
+// Copyright (c) 2022 Pengutronix, Oleksij Rempel <kernel@pengutronix.de>
+//
+
+#include <linux/device.h>
+#include <linux/of.h>
+#include <linux/pse-pd/pse.h>
+
+static DEFINE_MUTEX(pse_list_mutex);
+static LIST_HEAD(pse_controller_list);
+
+/**
+ * struct pse_control - a PSE control
+ * @pcdev: a pointer to the PSE controller device
+ * this PSE control belongs to
+ * @list: list entry for the pcdev's PSE controller list
+ * @id: ID of the PSE line in the PSE controller device
+ * @refcnt: Number of gets of this pse_control
+ */
+struct pse_control {
+ struct pse_controller_dev *pcdev;
+ struct list_head list;
+ unsigned int id;
+ struct kref refcnt;
+};
+
+/**
+ * of_pse_zero_xlate - dummy function for controllers with one only control
+ * @pcdev: a pointer to the PSE controller device
+ * @pse_spec: PSE line specifier as found in the device tree
+ *
+ * This static translation function is used by default if of_xlate in
+ * :c:type:`pse_controller_dev` is not set. It is useful for all PSE
+ * controllers with #pse-cells = <0>.
+ */
+static int of_pse_zero_xlate(struct pse_controller_dev *pcdev,
+ const struct of_phandle_args *pse_spec)
+{
+ return 0;
+}
+
+/**
+ * of_pse_simple_xlate - translate pse_spec to the PSE line number
+ * @pcdev: a pointer to the PSE controller device
+ * @pse_spec: PSE line specifier as found in the device tree
+ *
+ * This static translation function is used by default if of_xlate in
+ * :c:type:`pse_controller_dev` is not set. It is useful for all PSE
+ * controllers with 1:1 mapping, where PSE lines can be indexed by number
+ * without gaps.
+ */
+static int of_pse_simple_xlate(struct pse_controller_dev *pcdev,
+ const struct of_phandle_args *pse_spec)
+{
+ if (pse_spec->args[0] >= pcdev->nr_lines)
+ return -EINVAL;
+
+ return pse_spec->args[0];
+}
+
+/**
+ * pse_controller_register - register a PSE controller device
+ * @pcdev: a pointer to the initialized PSE controller device
+ */
+int pse_controller_register(struct pse_controller_dev *pcdev)
+{
+ if (!pcdev->of_xlate) {
+ if (pcdev->of_pse_n_cells == 0)
+ pcdev->of_xlate = of_pse_zero_xlate;
+ else if (pcdev->of_pse_n_cells == 1)
+ pcdev->of_xlate = of_pse_simple_xlate;
+ }
+
+ mutex_init(&pcdev->lock);
+ INIT_LIST_HEAD(&pcdev->pse_control_head);
+
+ mutex_lock(&pse_list_mutex);
+ list_add(&pcdev->list, &pse_controller_list);
+ mutex_unlock(&pse_list_mutex);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(pse_controller_register);
+
+/**
+ * pse_controller_unregister - unregister a PSE controller device
+ * @pcdev: a pointer to the PSE controller device
+ */
+void pse_controller_unregister(struct pse_controller_dev *pcdev)
+{
+ mutex_lock(&pse_list_mutex);
+ list_del(&pcdev->list);
+ mutex_unlock(&pse_list_mutex);
+}
+EXPORT_SYMBOL_GPL(pse_controller_unregister);
+
+static void devm_pse_controller_release(struct device *dev, void *res)
+{
+ pse_controller_unregister(*(struct pse_controller_dev **)res);
+}
+
+/**
+ * devm_pse_controller_register - resource managed pse_controller_register()
+ * @dev: device that is registering this PSE controller
+ * @pcdev: a pointer to the initialized PSE controller device
+ *
+ * Managed pse_controller_register(). For PSE controllers registered by
+ * this function, pse_controller_unregister() is automatically called on
+ * driver detach. See pse_controller_register() for more information.
+ */
+int devm_pse_controller_register(struct device *dev,
+ struct pse_controller_dev *pcdev)
+{
+ struct pse_controller_dev **pcdevp;
+ int ret;
+
+ pcdevp = devres_alloc(devm_pse_controller_release, sizeof(*pcdevp),
+ GFP_KERNEL);
+ if (!pcdevp)
+ return -ENOMEM;
+
+ ret = pse_controller_register(pcdev);
+ if (ret) {
+ devres_free(pcdevp);
+ return ret;
+ }
+
+ *pcdevp = pcdev;
+ devres_add(dev, pcdevp);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(devm_pse_controller_register);
+
+/* PSE control section */
+
+static void __pse_control_release(struct kref *kref)
+{
+ struct pse_control *psec = container_of(kref, struct pse_control,
+ refcnt);
+
+ lockdep_assert_held(&pse_list_mutex);
+
+ module_put(psec->pcdev->owner);
+
+ list_del(&psec->list);
+ kfree(psec);
+}
+
+static void __pse_control_put_internal(struct pse_control *psec)
+{
+ lockdep_assert_held(&pse_list_mutex);
+
+ kref_put(&psec->refcnt, __pse_control_release);
+}
+
+/**
+ * pse_control_put - free the PSE control
+ * @psec: PSE control pointer
+ */
+void pse_control_put(struct pse_control *psec)
+{
+ if (IS_ERR_OR_NULL(psec))
+ return;
+
+ mutex_lock(&pse_list_mutex);
+ __pse_control_put_internal(psec);
+ mutex_unlock(&pse_list_mutex);
+}
+EXPORT_SYMBOL_GPL(pse_control_put);
+
+static struct pse_control *
+pse_control_get_internal(struct pse_controller_dev *pcdev, unsigned int index)
+{
+ struct pse_control *psec;
+
+ lockdep_assert_held(&pse_list_mutex);
+
+ list_for_each_entry(psec, &pcdev->pse_control_head, list) {
+ if (psec->id == index) {
+ kref_get(&psec->refcnt);
+ return psec;
+ }
+ }
+
+ psec = kzalloc(sizeof(*psec), GFP_KERNEL);
+ if (!psec)
+ return ERR_PTR(-ENOMEM);
+
+ if (!try_module_get(pcdev->owner)) {
+ kfree(psec);
+ return ERR_PTR(-ENODEV);
+ }
+
+ psec->pcdev = pcdev;
+ list_add(&psec->list, &pcdev->pse_control_head);
+ psec->id = index;
+ kref_init(&psec->refcnt);
+
+ return psec;
+}
+
+struct pse_control *
+of_pse_control_get(struct device_node *node)
+{
+ struct pse_controller_dev *r, *pcdev;
+ struct of_phandle_args args;
+ struct pse_control *psec;
+ int psec_id;
+ int ret;
+
+ if (!node)
+ return ERR_PTR(-EINVAL);
+
+ ret = of_parse_phandle_with_args(node, "pses", "#pse-cells", 0, &args);
+ if (ret)
+ return ERR_PTR(ret);
+
+ mutex_lock(&pse_list_mutex);
+ pcdev = NULL;
+ list_for_each_entry(r, &pse_controller_list, list) {
+ if (args.np == r->dev->of_node) {
+ pcdev = r;
+ break;
+ }
+ }
+
+ if (!pcdev) {
+ psec = ERR_PTR(-EPROBE_DEFER);
+ goto out;
+ }
+
+ if (WARN_ON(args.args_count != pcdev->of_pse_n_cells)) {
+ psec = ERR_PTR(-EINVAL);
+ goto out;
+ }
+
+ psec_id = pcdev->of_xlate(pcdev, &args);
+ if (psec_id < 0) {
+ psec = ERR_PTR(psec_id);
+ goto out;
+ }
+
+ /* pse_list_mutex also protects the pcdev's pse_control list */
+ psec = pse_control_get_internal(pcdev, psec_id);
+
+out:
+ mutex_unlock(&pse_list_mutex);
+ of_node_put(args.np);
+
+ return psec;
+}
+EXPORT_SYMBOL_GPL(of_pse_control_get);
+
+/**
+ * pse_ethtool_get_status - get status of PSE control
+ * @psec: PSE control pointer
+ * @extack: extack for reporting useful error messages
+ * @status: struct to store PSE status
+ */
+int pse_ethtool_get_status(struct pse_control *psec,
+ struct netlink_ext_ack *extack,
+ struct pse_control_status *status)
+{
+ const struct pse_controller_ops *ops;
+ int err;
+
+ ops = psec->pcdev->ops;
+
+ if (!ops->ethtool_get_status) {
+ NL_SET_ERR_MSG(extack,
+ "PSE driver does not support status report");
+ return -EOPNOTSUPP;
+ }
+
+ mutex_lock(&psec->pcdev->lock);
+ err = ops->ethtool_get_status(psec->pcdev, psec->id, extack, status);
+ mutex_unlock(&psec->pcdev->lock);
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(pse_ethtool_get_status);
+
+/**
+ * pse_ethtool_set_config - set PSE control configuration
+ * @psec: PSE control pointer
+ * @extack: extack for reporting useful error messages
+ * @config: Configuration of the test to run
+ */
+int pse_ethtool_set_config(struct pse_control *psec,
+ struct netlink_ext_ack *extack,
+ const struct pse_control_config *config)
+{
+ const struct pse_controller_ops *ops;
+ int err;
+
+ ops = psec->pcdev->ops;
+
+ if (!ops->ethtool_set_config) {
+ NL_SET_ERR_MSG(extack,
+ "PSE driver does not configuration");
+ return -EOPNOTSUPP;
+ }
+
+ mutex_lock(&psec->pcdev->lock);
+ err = ops->ethtool_set_config(psec->pcdev, psec->id, extack, config);
+ mutex_unlock(&psec->pcdev->lock);
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(pse_ethtool_set_config);
diff --git a/drivers/net/pse-pd/pse_regulator.c b/drivers/net/pse-pd/pse_regulator.c
new file mode 100644
index 0000000000..e2bf8306ca
--- /dev/null
+++ b/drivers/net/pse-pd/pse_regulator.c
@@ -0,0 +1,147 @@
+// SPDX-License-Identifier: GPL-2.0-only
+//
+// Driver for the regulator based Ethernet Power Sourcing Equipment, without
+// auto classification support.
+//
+// Copyright (c) 2022 Pengutronix, Oleksij Rempel <kernel@pengutronix.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 pse_reg_priv {
+ struct pse_controller_dev pcdev;
+ struct regulator *ps; /*power source */
+ enum ethtool_podl_pse_admin_state admin_state;
+};
+
+static struct pse_reg_priv *to_pse_reg(struct pse_controller_dev *pcdev)
+{
+ return container_of(pcdev, struct pse_reg_priv, pcdev);
+}
+
+static int
+pse_reg_ethtool_set_config(struct pse_controller_dev *pcdev, unsigned long id,
+ struct netlink_ext_ack *extack,
+ const struct pse_control_config *config)
+{
+ struct pse_reg_priv *priv = to_pse_reg(pcdev);
+ int ret;
+
+ if (priv->admin_state == config->admin_cotrol)
+ return 0;
+
+ switch (config->admin_cotrol) {
+ 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",
+ config->admin_cotrol);
+ ret = -ENOTSUPP;
+ }
+
+ if (ret)
+ return ret;
+
+ priv->admin_state = config->admin_cotrol;
+
+ return 0;
+}
+
+static int
+pse_reg_ethtool_get_status(struct pse_controller_dev *pcdev, unsigned long id,
+ struct netlink_ext_ack *extack,
+ struct pse_control_status *status)
+{
+ struct pse_reg_priv *priv = to_pse_reg(pcdev);
+ int ret;
+
+ ret = regulator_is_enabled(priv->ps);
+ if (ret < 0)
+ return ret;
+
+ if (!ret)
+ status->podl_pw_status = ETHTOOL_PODL_PSE_PW_D_STATUS_DISABLED;
+ else
+ status->podl_pw_status =
+ ETHTOOL_PODL_PSE_PW_D_STATUS_DELIVERING;
+
+ status->podl_admin_state = priv->admin_state;
+
+ return 0;
+}
+
+static const struct pse_controller_ops pse_reg_ops = {
+ .ethtool_get_status = pse_reg_ethtool_get_status,
+ .ethtool_set_config = pse_reg_ethtool_set_config,
+};
+
+static int
+pse_reg_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct pse_reg_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_exclusive(dev, "pse");
+ if (IS_ERR(priv->ps))
+ return dev_err_probe(dev, PTR_ERR(priv->ps),
+ "failed to get PSE regulator.\n");
+
+ platform_set_drvdata(pdev, priv);
+
+ ret = regulator_is_enabled(priv->ps);
+ if (ret < 0)
+ return ret;
+
+ if (ret)
+ priv->admin_state = ETHTOOL_PODL_PSE_ADMIN_STATE_ENABLED;
+ else
+ priv->admin_state = ETHTOOL_PODL_PSE_ADMIN_STATE_DISABLED;
+
+ priv->pcdev.owner = THIS_MODULE;
+ priv->pcdev.ops = &pse_reg_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 __maybe_unused struct of_device_id pse_reg_of_match[] = {
+ { .compatible = "podl-pse-regulator", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, pse_reg_of_match);
+
+static struct platform_driver pse_reg_driver = {
+ .probe = pse_reg_probe,
+ .driver = {
+ .name = "PSE regulator",
+ .of_match_table = of_match_ptr(pse_reg_of_match),
+ },
+};
+module_platform_driver(pse_reg_driver);
+
+MODULE_AUTHOR("Oleksij Rempel <kernel@pengutronix.de>");
+MODULE_DESCRIPTION("regulator based Ethernet Power Sourcing Equipment");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:pse-regulator");
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-28 18:05:43 +0000