138 lines
3.4 KiB
C
138 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* AMD Promontory 21 xHCI host controller PCI Bus Glue.
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*
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* This does not add any PROM21-specific USB or xHCI operation. It exists only
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* to publish an auxiliary device for integrated temperature sensor support.
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*
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* Copyright (C) 2026 Jihong Min <hurryman2212@gmail.com>
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*/
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#include <linux/auxiliary_bus.h>
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#include <linux/device/devres.h>
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#include <linux/errno.h>
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#include <linux/idr.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/platform_data/usb-xhci-prom21.h>
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#include <linux/usb.h>
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#include <linux/usb/hcd.h>
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#include "xhci-pci.h"
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struct prom21_xhci_auxdev {
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struct auxiliary_device *auxdev;
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struct prom21_xhci_pdata pdata;
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int id;
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};
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static DEFINE_IDA(prom21_xhci_auxdev_ida);
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static void prom21_xhci_auxdev_release(struct device *dev, void *res)
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{
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struct prom21_xhci_auxdev *prom21_auxdev = res;
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auxiliary_device_destroy(prom21_auxdev->auxdev);
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ida_free(&prom21_xhci_auxdev_ida, prom21_auxdev->id);
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}
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static int prom21_xhci_create_auxdev(struct pci_dev *pdev)
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{
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struct prom21_xhci_auxdev *prom21_auxdev;
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struct usb_hcd *hcd = pci_get_drvdata(pdev);
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int ret;
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prom21_auxdev = devres_alloc(prom21_xhci_auxdev_release,
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sizeof(*prom21_auxdev), GFP_KERNEL);
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if (!prom21_auxdev)
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return -ENOMEM;
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prom21_auxdev->pdata.pdev = pdev;
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prom21_auxdev->pdata.regs = hcd->regs;
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prom21_auxdev->pdata.rsrc_len = hcd->rsrc_len;
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prom21_auxdev->id = ida_alloc(&prom21_xhci_auxdev_ida, GFP_KERNEL);
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if (prom21_auxdev->id < 0) {
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ret = prom21_auxdev->id;
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goto err_free_devres;
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}
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prom21_auxdev->auxdev = auxiliary_device_create(&pdev->dev,
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KBUILD_MODNAME, "hwmon",
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&prom21_auxdev->pdata,
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prom21_auxdev->id);
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if (!prom21_auxdev->auxdev) {
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ret = -ENOMEM;
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goto err_free_ida;
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}
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devres_add(&pdev->dev, prom21_auxdev);
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return 0;
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err_free_ida:
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ida_free(&prom21_xhci_auxdev_ida, prom21_auxdev->id);
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err_free_devres:
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devres_free(prom21_auxdev);
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return ret;
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}
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static void prom21_xhci_destroy_auxdev(struct pci_dev *pdev)
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{
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devres_release(&pdev->dev, prom21_xhci_auxdev_release, NULL, NULL);
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}
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static int prom21_xhci_probe(struct pci_dev *dev,
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const struct pci_device_id *id)
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{
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int retval;
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retval = xhci_pci_common_probe(dev, id);
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if (retval)
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return retval;
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retval = prom21_xhci_create_auxdev(dev);
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if (retval) {
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/*
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* The auxiliary device only provides optional temperature sensor
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* support. Keep the xHCI controller usable if it fails.
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*/
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dev_err(&dev->dev,
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"failed to create PROM21 hwmon auxiliary device: %d\n",
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retval);
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}
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return 0;
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}
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static void prom21_xhci_remove(struct pci_dev *dev)
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{
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prom21_xhci_destroy_auxdev(dev);
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xhci_pci_remove(dev);
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}
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static const struct pci_device_id pci_ids[] = {
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{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_PROM21_XHCI_43FC) },
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{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_PROM21_XHCI_43FD) },
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{ /* end: all zeroes */ }
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};
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MODULE_DEVICE_TABLE(pci, pci_ids);
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static struct pci_driver prom21_xhci_driver = {
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.name = "xhci-pci-prom21",
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.id_table = pci_ids,
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.probe = prom21_xhci_probe,
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.remove = prom21_xhci_remove,
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.shutdown = usb_hcd_pci_shutdown,
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.driver = {
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.pm = pm_ptr(&usb_hcd_pci_pm_ops),
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},
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};
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module_pci_driver(prom21_xhci_driver);
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MODULE_AUTHOR("Jihong Min <hurryman2212@gmail.com>");
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MODULE_DESCRIPTION("AMD Promontory 21 xHCI PCI Host Controller Driver");
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MODULE_IMPORT_NS("xhci");
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MODULE_LICENSE("GPL");
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