drivers/platform/x86/intel_pmc_core_pltdrv.c

   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
  21 static struct platform_device pmc_core_device = {
  22         .name = "intel_pmc_core",
  23 };
  24
  25 /*
  26  * intel_pmc_core_platform_ids is the list of platforms where we want to
  27  * instantiate the platform_device if not already instantiated. This is
  28  * different than intel_pmc_core_ids in intel_pmc_core.c which is the
  29  * list of platforms that the driver supports for pmc_core device. The
  30  * other list may grow, but this list should not.
  31  */
  32 static const struct x86_cpu_id intel_pmc_core_platform_ids[] = {
  33         INTEL_CPU_FAM6(SKYLAKE_MOBILE, pmc_core_device),
  34         INTEL_CPU_FAM6(SKYLAKE_DESKTOP, pmc_core_device),
  35         INTEL_CPU_FAM6(KABYLAKE_MOBILE, pmc_core_device),
  36         INTEL_CPU_FAM6(KABYLAKE_DESKTOP, pmc_core_device),
  37         INTEL_CPU_FAM6(CANNONLAKE_MOBILE, pmc_core_device),
  38         INTEL_CPU_FAM6(ICELAKE_MOBILE, pmc_core_device),
  39         {}
  40 };
  41 MODULE_DEVICE_TABLE(x86cpu, intel_pmc_core_platform_ids);
  42
  43 static int __init pmc_core_platform_init(void)
  44 {
  45         /* Skip creating the platform device if ACPI already has a device */
  46         if (acpi_dev_present("INT33A1", NULL, -1))
  47                 return -ENODEV;
  48
  49         if (!x86_match_cpu(intel_pmc_core_platform_ids))
  50                 return -ENODEV;
  51
  52         return platform_device_register(&pmc_core_device);
  53 }
  54
  55 static void __exit pmc_core_platform_exit(void)
  56 {
  57         platform_device_unregister(&pmc_core_device);
  58 }
  59
  60 module_init(pmc_core_platform_init);
  61 module_exit(pmc_core_platform_exit);
  62 MODULE_LICENSE("GPL v2");