Most modern platforms already have the ACPI device "INT33A1" that could
be used to attach to the driver. Switch the driver to using that and
thus make the intel_pmc_core.c a pure platform_driver.
Some of the legacy platforms though, may still not have this ACPI device
in their ACPI tables. Thus for such platforms, move the code to manually
instantiate a platform_device into a new file of its own. This would
instantiate the intel_pmc_core platform device and thus attach to
the driver, if the ACPI device for the same ("INT33A1") is not present
in a system where it should be. This was discussed here:
https://www.mail-archive.com/linux-kernel@xxxxxxxxxxxxxxx/msg1966991.html
Signed-off-by: Rajat Jain <rajatja@xxxxxxxxxx>
---
v7: Include module.h and add MODULE_LICENSE()
v6: was here: https://patchwork.kernel.org/patch/10906387/
(The patchset was accepted, but this particular patch was later
dropped becasue it created some warnings in certain kernel
configurations: https://www.spinics.net/lists/linux-next/msg47611.html)
drivers/platform/x86/Makefile | 2 +-
drivers/platform/x86/intel_pmc_core.c | 40 +++---------
.../platform/x86/intel_pmc_core_plat_drv.c | 62 +++++++++++++++++++
3 files changed, 71 insertions(+), 33 deletions(-)
create mode 100644 drivers/platform/x86/intel_pmc_core_plat_drv.c
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index 87b0069bd781..4ba707111c27 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -89,7 +89,7 @@ obj-$(CONFIG_INTEL_BXTWC_PMIC_TMU) += intel_bxtwc_tmu.o
obj-$(CONFIG_INTEL_TELEMETRY) += intel_telemetry_core.o \
intel_telemetry_pltdrv.o \
intel_telemetry_debugfs.o
-obj-$(CONFIG_INTEL_PMC_CORE) += intel_pmc_core.o
+obj-$(CONFIG_INTEL_PMC_CORE) += intel_pmc_core.o intel_pmc_core_plat_drv.o
obj-$(CONFIG_PMC_ATOM) += pmc_atom.o
obj-$(CONFIG_MLX_PLATFORM) += mlx-platform.o
obj-$(CONFIG_INTEL_TURBO_MAX_3) += intel_turbo_max_3.o
diff --git a/drivers/platform/x86/intel_pmc_core.c b/drivers/platform/x86/intel_pmc_core.c
index 1d902230ba61..f20d08ad39ea 100644
--- a/drivers/platform/x86/intel_pmc_core.c
+++ b/drivers/platform/x86/intel_pmc_core.c
@@ -1023,47 +1023,23 @@ static const struct dev_pm_ops pmc_core_pm_ops = {
SET_LATE_SYSTEM_SLEEP_PM_OPS(pmc_core_suspend, pmc_core_resume)
};
+static const struct acpi_device_id pmc_core_acpi_ids[] = {
+ {"INT33A1", 0}, /* _HID for Intel Power Engine, _CID PNP0D80*/
+ { }
+};
+MODULE_DEVICE_TABLE(acpi, pmc_core_acpi_ids);
+
static struct platform_driver pmc_core_driver = {
.driver = {
.name = "intel_pmc_core",
+ .acpi_match_table = ACPI_PTR(pmc_core_acpi_ids),
.pm = &pmc_core_pm_ops,
},
.probe = pmc_core_probe,
.remove = pmc_core_remove,
};
-static struct platform_device pmc_core_device = {
- .name = "intel_pmc_core",
-};
-
-static int __init pmc_core_init(void)
-{
- int ret;
-
- if (!x86_match_cpu(intel_pmc_core_ids))
- return -ENODEV;
-
- ret = platform_driver_register(&pmc_core_driver);
- if (ret)
- return ret;
-
- ret = platform_device_register(&pmc_core_device);
- if (ret) {
- platform_driver_unregister(&pmc_core_driver);
- return ret;
- }
-
- return 0;
-}
-
-static void __exit pmc_core_exit(void)
-{
- platform_device_unregister(&pmc_core_device);
- platform_driver_unregister(&pmc_core_driver);
-}
-
-module_init(pmc_core_init)
-module_exit(pmc_core_exit)
+module_platform_driver(pmc_core_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Intel PMC Core Driver");
diff --git a/drivers/platform/x86/intel_pmc_core_plat_drv.c b/drivers/platform/x86/intel_pmc_core_plat_drv.c
new file mode 100644
index 000000000000..a8754a6db1b8
--- /dev/null
+++ b/drivers/platform/x86/intel_pmc_core_plat_drv.c
@@ -0,0 +1,62 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * Intel PMC Core platform init
+ * Copyright (c) 2019, Google Inc.
+ * Author - Rajat Jain
+ *
+ * This code instantiates platform devices for intel_pmc_core driver, only
+ * on supported platforms that may not have the ACPI devices in the ACPI tables.
+ * No new platforms should be added here, because we expect that new platforms
+ * should all have the ACPI device, which is the preferred way of enumeration.
+ */
+
+#include <linux/acpi.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include <asm/cpu_device_id.h>
+#include <asm/intel-family.h>
+
+static struct platform_device pmc_core_device = {
+ .name = "intel_pmc_core",
+};
+
+/*
+ * intel_pmc_core_platform_ids is the list of platforms where we want to
+ * instantiate the platform_device if not already instantiated. This is
+ * different than intel_pmc_core_ids in intel_pmc_core.c which is the
+ * list of platforms that the driver supports for pmc_core device. The
+ * other list may grow, but this list should not.
+ */
+static const struct x86_cpu_id intel_pmc_core_platform_ids[] = {
+ INTEL_CPU_FAM6(SKYLAKE_MOBILE, pmc_core_device),
+ INTEL_CPU_FAM6(SKYLAKE_DESKTOP, pmc_core_device),
+ INTEL_CPU_FAM6(KABYLAKE_MOBILE, pmc_core_device),
+ INTEL_CPU_FAM6(KABYLAKE_DESKTOP, pmc_core_device),
+ INTEL_CPU_FAM6(CANNONLAKE_MOBILE, pmc_core_device),
+ INTEL_CPU_FAM6(ICELAKE_MOBILE, pmc_core_device),
+ {}
+};
+MODULE_DEVICE_TABLE(x86cpu, intel_pmc_core_platform_ids);
+
+static int __init pmc_core_platform_init(void)
+{
+ /* Skip creating the platform device if ACPI already has a device */
+ if (acpi_dev_present("INT33A1", NULL, -1))
+ return -ENODEV;
+
+ if (!x86_match_cpu(intel_pmc_core_platform_ids))
+ return -ENODEV;
+
+ return platform_device_register(&pmc_core_device);
+}
+
+static void __exit pmc_core_platform_exit(void)
+{
+ platform_device_unregister(&pmc_core_device);
+}
+
+module_init(pmc_core_platform_init);
+module_exit(pmc_core_platform_exit);
+MODULE_LICENSE("GPL v2");
--
2.22.0.410.gd8fdbe21b5-goog
