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 void intel_pmc_core_release(struct device *dev)
  22 {
  23         /* Nothing to do. */
  24 }
  25
  26 static struct platform_device pmc_core_device = {
  27         .name = "intel_pmc_core",
  28         .dev  = {
  29                 .release = intel_pmc_core_release,
  30         },
  31 };
  32
  33 /*
  34  * intel_pmc_core_platform_ids is the list of platforms where we want to
  35  * instantiate the platform_device if not already instantiated. This is
  36  * different than intel_pmc_core_ids in intel_pmc_core.c which is the
  37  * list of platforms that the driver supports for pmc_core device. The
  38  * other list may grow, but this list should not.
  39  */
  40 static const struct x86_cpu_id intel_pmc_core_platform_ids[] = {
  41         INTEL_CPU_FAM6(SKYLAKE_L, pmc_core_device),
  42         INTEL_CPU_FAM6(SKYLAKE, pmc_core_device),
  43         INTEL_CPU_FAM6(KABYLAKE_L, pmc_core_device),
  44         INTEL_CPU_FAM6(KABYLAKE, pmc_core_device),
  45         INTEL_CPU_FAM6(CANNONLAKE_L, pmc_core_device),
  46         INTEL_CPU_FAM6(ICELAKE_L, pmc_core_device),
  47         {}
  48 };
  49 MODULE_DEVICE_TABLE(x86cpu, intel_pmc_core_platform_ids);
  50
  51 static int __init pmc_core_platform_init(void)
  52 {
  53         /* Skip creating the platform device if ACPI already has a device */
  54         if (acpi_dev_present("INT33A1", NULL, -1))
  55                 return -ENODEV;
  56
  57         if (!x86_match_cpu(intel_pmc_core_platform_ids))
  58                 return -ENODEV;
  59
  60         return platform_device_register(&pmc_core_device);
  61 }
  62
  63 static void __exit pmc_core_platform_exit(void)
  64 {
  65         platform_device_unregister(&pmc_core_device);
  66 }
  67
  68 module_init(pmc_core_platform_init);
  69 module_exit(pmc_core_platform_exit);
  70 MODULE_LICENSE("GPL v2");