ACPI: DPTF: Add PCH FIVR participant driver (2ce6324e) · Commits · 戴 / test

Documentation/ABI/testing/sysfs-platform-dptf

+16 −0

Original line number	Diff line number	Diff line
		@@ -92,3 +92,19 @@ Contact: linux-acpi@vger.kernel.org
		Description:
		(RO) The battery discharge current capability obtained from battery fuel gauge in
		milli Amps.

		What: /sys/bus/platform/devices/INTC1045:00/pch_fivr_switch_frequency/freq_mhz_low_clock
		Date: November, 2020
		KernelVersion: v5.10
		Contact: linux-acpi@vger.kernel.org
		Description:
		(RW) The PCH FIVR (Fully Integrated Voltage Regulator) switching frequency in MHz,
		when FIVR clock is 19.2MHz or 24MHz.

		What: /sys/bus/platform/devices/INTC1045:00/pch_fivr_switch_frequency/freq_mhz_high_clock
		Date: November, 2020
		KernelVersion: v5.10
		Contact: linux-acpi@vger.kernel.org
		Description:
		(RW) The PCH FIVR (Fully Integrated Voltage Regulator) switching frequency in MHz,
		when FIVR clock is 38.4MHz.

drivers/acpi/dptf/Kconfig

+14 −0

Original line number	Diff line number	Diff line
		@@ -14,3 +14,17 @@ config DPTF_POWER

		To compile this driver as a module, choose M here:
		the module will be called dptf_power.

		config DPTF_PCH_FIVR
		tristate "DPTF PCH FIVR Participant"
		depends on X86
		help
		This driver adds support for Dynamic Platform and Thermal Framework
		(DPTF) PCH FIVR Participant device support. This driver allows to
		switch PCH FIVR (Fully Integrated Voltage Regulator) frequency.
		This participant is responsible for exposing:
		freq_mhz_low_clock
		freq_mhz_high_clock

		To compile this driver as a module, choose M here:
		the module will be called dptf_pch_fivr.

drivers/acpi/dptf/Makefile

+1 −0

Original line number	Diff line number	Diff line
		# SPDX-License-Identifier: GPL-2.0-only
		obj-$(CONFIG_ACPI) += int340x_thermal.o
		obj-$(CONFIG_DPTF_POWER) += dptf_power.o
		obj-$(CONFIG_DPTF_PCH_FIVR) += dptf_pch_fivr.o

drivers/acpi/dptf/dptf_pch_fivr.c

0 → 100644

+126 −0

Original line number	Diff line number	Diff line
		// SPDX-License-Identifier: GPL-2.0-only
		/*
		* dptf_pch_fivr: DPTF PCH FIVR Participant driver
		* Copyright (c) 2020, Intel Corporation.
		*/

		#include <linux/acpi.h>
		#include <linux/kernel.h>
		#include <linux/module.h>
		#include <linux/platform_device.h>

		/*
		* Presentation of attributes which are defined for INT1045
		* They are:
		* freq_mhz_low_clock : Set PCH FIVR switching freq for
		* FIVR clock 19.2MHz and 24MHz
		* freq_mhz_high_clock : Set PCH FIVR switching freq for
		* FIVR clock 38.4MHz
		*/
		#define PCH_FIVR_SHOW(name, method) \
		static ssize_t name##_show(struct device *dev,\
		struct device_attribute *attr,\
		char *buf)\
		{\
		struct acpi_device *acpi_dev = dev_get_drvdata(dev);\
		unsigned long long val;\
		acpi_status status;\
		\
		status = acpi_evaluate_integer(acpi_dev->handle, #method,\
		NULL, &val);\
		if (ACPI_SUCCESS(status))\
		return sprintf(buf, "%d\n", (int)val);\
		else\
		return -EINVAL;\
		}

		#define PCH_FIVR_STORE(name, method) \
		static ssize_t name##_store(struct device *dev,\
		struct device_attribute *attr,\
		const char *buf, size_t count)\
		{\
		struct acpi_device *acpi_dev = dev_get_drvdata(dev);\
		acpi_status status;\
		u32 val;\
		\
		if (kstrtouint(buf, 0, &val) < 0)\
		return -EINVAL;\
		\
		status = acpi_execute_simple_method(acpi_dev->handle, #method, val);\
		if (ACPI_SUCCESS(status))\
		return count;\
		\
		return -EINVAL;\
		}

		PCH_FIVR_SHOW(freq_mhz_low_clock, GFC0)
		PCH_FIVR_SHOW(freq_mhz_high_clock, GFC1)
		PCH_FIVR_STORE(freq_mhz_low_clock, RFC0)
		PCH_FIVR_STORE(freq_mhz_high_clock, RFC1)

		static DEVICE_ATTR_RW(freq_mhz_low_clock);
		static DEVICE_ATTR_RW(freq_mhz_high_clock);

		static struct attribute *fivr_attrs[] = {
		&dev_attr_freq_mhz_low_clock.attr,
		&dev_attr_freq_mhz_high_clock.attr,
		NULL
		};

		static const struct attribute_group pch_fivr_attribute_group = {
		.attrs = fivr_attrs,
		.name = "pch_fivr_switch_frequency"
		};

		static int pch_fivr_add(struct platform_device *pdev)
		{
		struct acpi_device *acpi_dev;
		unsigned long long ptype;
		acpi_status status;
		int result;

		acpi_dev = ACPI_COMPANION(&(pdev->dev));
		if (!acpi_dev)
		return -ENODEV;

		status = acpi_evaluate_integer(acpi_dev->handle, "PTYP", NULL, &ptype);
		if (ACPI_FAILURE(status) \|\| ptype != 0x05)
		return -ENODEV;

		result = sysfs_create_group(&pdev->dev.kobj,
		&pch_fivr_attribute_group);
		if (result)
		return result;

		platform_set_drvdata(pdev, acpi_dev);

		return 0;
		}

		static int pch_fivr_remove(struct platform_device *pdev)
		{
		sysfs_remove_group(&pdev->dev.kobj, &pch_fivr_attribute_group);

		return 0;
		}

		static const struct acpi_device_id pch_fivr_device_ids[] = {
		{"INTC1045", 0},
		{"", 0},
		};
		MODULE_DEVICE_TABLE(acpi, pch_fivr_device_ids);

		static struct platform_driver pch_fivr_driver = {
		.probe = pch_fivr_add,
		.remove = pch_fivr_remove,
		.driver = {
		.name = "DPTF PCH FIVR",
		.acpi_match_table = pch_fivr_device_ids,
		},
		};

		module_platform_driver(pch_fivr_driver);

		MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
		MODULE_LICENSE("GPL v2");
		MODULE_DESCRIPTION("ACPI DPTF PCH FIVR driver");

drivers/acpi/dptf/int340x_thermal.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -27,6 +27,7 @@ static const struct acpi_device_id int340x_thermal_device_ids[] = {
		{"INTC1040"},
		{"INTC1043"},
		{"INTC1044"},
		{"INTC1045"},
		{"INTC1047"},
		{""},
		};

Admin message