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Add generic, regulator based PSE 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@pengutronix.de> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
148 lines
3.5 KiB
C
148 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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//
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// Driver for the regulator based Ethernet Power Sourcing Equipment, without
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// auto classification support.
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//
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// Copyright (c) 2022 Pengutronix, Oleksij Rempel <kernel@pengutronix.de>
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//
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/pse-pd/pse.h>
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#include <linux/regulator/consumer.h>
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struct pse_reg_priv {
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struct pse_controller_dev pcdev;
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struct regulator *ps; /*power source */
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enum ethtool_podl_pse_admin_state admin_state;
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};
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static struct pse_reg_priv *to_pse_reg(struct pse_controller_dev *pcdev)
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{
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return container_of(pcdev, struct pse_reg_priv, pcdev);
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}
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static int
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pse_reg_ethtool_set_config(struct pse_controller_dev *pcdev, unsigned long id,
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struct netlink_ext_ack *extack,
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const struct pse_control_config *config)
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{
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struct pse_reg_priv *priv = to_pse_reg(pcdev);
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int ret;
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if (priv->admin_state == config->admin_cotrol)
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return 0;
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switch (config->admin_cotrol) {
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case ETHTOOL_PODL_PSE_ADMIN_STATE_ENABLED:
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ret = regulator_enable(priv->ps);
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break;
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case ETHTOOL_PODL_PSE_ADMIN_STATE_DISABLED:
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ret = regulator_disable(priv->ps);
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break;
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default:
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dev_err(pcdev->dev, "Unknown admin state %i\n",
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config->admin_cotrol);
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ret = -ENOTSUPP;
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}
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if (ret)
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return ret;
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priv->admin_state = config->admin_cotrol;
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return 0;
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}
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static int
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pse_reg_ethtool_get_status(struct pse_controller_dev *pcdev, unsigned long id,
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struct netlink_ext_ack *extack,
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struct pse_control_status *status)
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{
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struct pse_reg_priv *priv = to_pse_reg(pcdev);
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int ret;
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ret = regulator_is_enabled(priv->ps);
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if (ret < 0)
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return ret;
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if (!ret)
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status->podl_pw_status = ETHTOOL_PODL_PSE_PW_D_STATUS_DISABLED;
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else
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status->podl_pw_status =
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ETHTOOL_PODL_PSE_PW_D_STATUS_DELIVERING;
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status->podl_admin_state = priv->admin_state;
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return 0;
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}
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static const struct pse_controller_ops pse_reg_ops = {
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.ethtool_get_status = pse_reg_ethtool_get_status,
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.ethtool_set_config = pse_reg_ethtool_set_config,
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};
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static int
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pse_reg_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct pse_reg_priv *priv;
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int ret;
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priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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if (!pdev->dev.of_node)
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return -ENOENT;
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priv->ps = devm_regulator_get_exclusive(dev, "pse");
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if (IS_ERR(priv->ps))
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return dev_err_probe(dev, PTR_ERR(priv->ps),
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"failed to get PSE regulator.\n");
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platform_set_drvdata(pdev, priv);
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ret = regulator_is_enabled(priv->ps);
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if (ret < 0)
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return ret;
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if (ret)
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priv->admin_state = ETHTOOL_PODL_PSE_ADMIN_STATE_ENABLED;
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else
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priv->admin_state = ETHTOOL_PODL_PSE_ADMIN_STATE_DISABLED;
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priv->pcdev.owner = THIS_MODULE;
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priv->pcdev.ops = &pse_reg_ops;
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priv->pcdev.dev = dev;
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ret = devm_pse_controller_register(dev, &priv->pcdev);
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if (ret) {
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dev_err(dev, "failed to register PSE controller (%pe)\n",
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ERR_PTR(ret));
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return ret;
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}
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return 0;
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}
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static const __maybe_unused struct of_device_id pse_reg_of_match[] = {
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{ .compatible = "podl-pse-regulator", },
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{ },
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};
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MODULE_DEVICE_TABLE(of, pse_reg_of_match);
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static struct platform_driver pse_reg_driver = {
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.probe = pse_reg_probe,
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.driver = {
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.name = "PSE regulator",
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.of_match_table = of_match_ptr(pse_reg_of_match),
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},
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};
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module_platform_driver(pse_reg_driver);
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MODULE_AUTHOR("Oleksij Rempel <kernel@pengutronix.de>");
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MODULE_DESCRIPTION("regulator based Ethernet Power Sourcing Equipment");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:pse-regulator");
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