155 lines
3.6 KiB
C
155 lines
3.6 KiB
C
// 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_pi_enable(struct pse_controller_dev *pcdev, int id)
|
|
{
|
|
struct pse_reg_priv *priv = to_pse_reg(pcdev);
|
|
int ret;
|
|
|
|
ret = regulator_enable(priv->ps);
|
|
if (ret)
|
|
return ret;
|
|
|
|
priv->admin_state = ETHTOOL_PODL_PSE_ADMIN_STATE_ENABLED;
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
pse_reg_pi_disable(struct pse_controller_dev *pcdev, int id)
|
|
{
|
|
struct pse_reg_priv *priv = to_pse_reg(pcdev);
|
|
int ret;
|
|
|
|
ret = regulator_disable(priv->ps);
|
|
if (ret)
|
|
return ret;
|
|
|
|
priv->admin_state = ETHTOOL_PODL_PSE_ADMIN_STATE_DISABLED;
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
pse_reg_pi_is_enabled(struct pse_controller_dev *pcdev, int id)
|
|
{
|
|
struct pse_reg_priv *priv = to_pse_reg(pcdev);
|
|
|
|
return regulator_is_enabled(priv->ps);
|
|
}
|
|
|
|
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,
|
|
.pi_enable = pse_reg_pi_enable,
|
|
.pi_is_enabled = pse_reg_pi_is_enabled,
|
|
.pi_disable = pse_reg_pi_disable,
|
|
};
|
|
|
|
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;
|
|
priv->pcdev.types = ETHTOOL_PSE_PODL;
|
|
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");
|