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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2024 Linaro Ltd.
* Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
*/
#include <linux/device.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/pci-pwrctrl.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
struct pci_pwrctrl_slot_data {
struct pci_pwrctrl ctx;
struct regulator_bulk_data *supplies;
int num_supplies;
};
static void devm_pci_pwrctrl_slot_power_off(void *data)
{
struct pci_pwrctrl_slot_data *slot = data;
regulator_bulk_disable(slot->num_supplies, slot->supplies);
regulator_bulk_free(slot->num_supplies, slot->supplies);
}
static int pci_pwrctrl_slot_probe(struct platform_device *pdev)
{
struct pci_pwrctrl_slot_data *slot;
struct device *dev = &pdev->dev;
int ret;
slot = devm_kzalloc(dev, sizeof(*slot), GFP_KERNEL);
if (!slot)
return -ENOMEM;
ret = of_regulator_bulk_get_all(dev, dev_of_node(dev),
&slot->supplies);
if (ret < 0) {
dev_err_probe(dev, ret, "Failed to get slot regulators\n");
return ret;
}
slot->num_supplies = ret;
ret = regulator_bulk_enable(slot->num_supplies, slot->supplies);
if (ret < 0) {
dev_err_probe(dev, ret, "Failed to enable slot regulators\n");
goto err_regulator_free;
}
ret = devm_add_action_or_reset(dev, devm_pci_pwrctrl_slot_power_off,
slot);
if (ret)
goto err_regulator_disable;
pci_pwrctrl_init(&slot->ctx, dev);
ret = devm_pci_pwrctrl_device_set_ready(dev, &slot->ctx);
if (ret)
return dev_err_probe(dev, ret, "Failed to register pwrctrl driver\n");
return 0;
err_regulator_disable:
regulator_bulk_disable(slot->num_supplies, slot->supplies);
err_regulator_free:
regulator_bulk_free(slot->num_supplies, slot->supplies);
return ret;
}
static const struct of_device_id pci_pwrctrl_slot_of_match[] = {
{
.compatible = "pciclass,0604",
},
{ }
};
MODULE_DEVICE_TABLE(of, pci_pwrctrl_slot_of_match);
static struct platform_driver pci_pwrctrl_slot_driver = {
.driver = {
.name = "pci-pwrctrl-slot",
.of_match_table = pci_pwrctrl_slot_of_match,
},
.probe = pci_pwrctrl_slot_probe,
};
module_platform_driver(pci_pwrctrl_slot_driver);
MODULE_AUTHOR("Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>");
MODULE_DESCRIPTION("Generic PCI Power Control driver for PCI Slots");
MODULE_LICENSE("GPL");
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