LXR linux/drivers/platform/x86/intel_pmc_core

   1// SPDX-License-Identifier: GPL-2.0
   2
   3/*
   4 * Intel PMC Core platform init
   5 * Copyright (c) 2019, Google Inc.
   6 * Author - Rajat Jain
   7 *
   8 * This code instantiates platform devices for intel_pmc_core driver, only
   9 * on supported platforms that may not have the ACPI devices in the ACPI tables.
  10 * No new platforms should be added here, because we expect that new platforms
  11 * should all have the ACPI device, which is the preferred way of enumeration.
  12 */
  13
  14#include <linux/acpi.h>
  15#include <linux/module.h>
  16#include <linux/platform_device.h>
  17
  18#include <asm/cpu_device_id.h>
  19#include <asm/intel-family.h>
  20
  21static void intel_pmc_core_release(struct device *dev)
  22{
  23        kfree(dev);
  24}
  25
  26static struct platform_device *pmc_core_device;
  27
  28/*
  29 * intel_pmc_core_platform_ids is the list of platforms where we want to
  30 * instantiate the platform_device if not already instantiated. This is
  31 * different than intel_pmc_core_ids in intel_pmc_core.c which is the
  32 * list of platforms that the driver supports for pmc_core device. The
  33 * other list may grow, but this list should not.
  34 */
  35static const struct x86_cpu_id intel_pmc_core_platform_ids[] = {
  36        X86_MATCH_INTEL_FAM6_MODEL(SKYLAKE_L,           &pmc_core_device),
  37        X86_MATCH_INTEL_FAM6_MODEL(SKYLAKE,             &pmc_core_device),
  38        X86_MATCH_INTEL_FAM6_MODEL(KABYLAKE_L,          &pmc_core_device),
  39        X86_MATCH_INTEL_FAM6_MODEL(KABYLAKE,            &pmc_core_device),
  40        X86_MATCH_INTEL_FAM6_MODEL(CANNONLAKE_L,        &pmc_core_device),
  41        X86_MATCH_INTEL_FAM6_MODEL(ICELAKE_L,           &pmc_core_device),
  42        X86_MATCH_INTEL_FAM6_MODEL(COMETLAKE,           &pmc_core_device),
  43        X86_MATCH_INTEL_FAM6_MODEL(COMETLAKE_L,         &pmc_core_device),
  44        {}
  45};
  46MODULE_DEVICE_TABLE(x86cpu, intel_pmc_core_platform_ids);
  47
  48static int __init pmc_core_platform_init(void)
  49{
  50        int retval;
  51
  52        /* Skip creating the platform device if ACPI already has a device */
  53        if (acpi_dev_present("INT33A1", NULL, -1))
  54                return -ENODEV;
  55
  56        if (!x86_match_cpu(intel_pmc_core_platform_ids))
  57                return -ENODEV;
  58
  59        pmc_core_device = kzalloc(sizeof(*pmc_core_device), GFP_KERNEL);
  60        if (!pmc_core_device)
  61                return -ENOMEM;
  62
  63        pmc_core_device->name = "intel_pmc_core";
  64        pmc_core_device->dev.release = intel_pmc_core_release;
  65
  66        retval = platform_device_register(pmc_core_device);
  67        if (retval)
  68                kfree(pmc_core_device);
  69
  70        return retval;
  71}
  72
  73static void __exit pmc_core_platform_exit(void)
  74{
  75        platform_device_unregister(pmc_core_device);
  76}
  77
  78module_init(pmc_core_platform_init);
  79module_exit(pmc_core_platform_exit);
  80MODULE_LICENSE("GPL v2");
  81