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38748bcb94
Add Alder Lake ACPI IDs for DPTF devices. Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
128 lines
3.0 KiB
C
128 lines
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* dptf_pch_fivr: DPTF PCH FIVR Participant driver
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* Copyright (c) 2020, Intel Corporation.
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*/
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#include <linux/acpi.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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/*
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* Presentation of attributes which are defined for INT1045
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* They are:
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* freq_mhz_low_clock : Set PCH FIVR switching freq for
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* FIVR clock 19.2MHz and 24MHz
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* freq_mhz_high_clock : Set PCH FIVR switching freq for
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* FIVR clock 38.4MHz
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*/
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#define PCH_FIVR_SHOW(name, method) \
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static ssize_t name##_show(struct device *dev,\
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struct device_attribute *attr,\
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char *buf)\
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{\
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struct acpi_device *acpi_dev = dev_get_drvdata(dev);\
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unsigned long long val;\
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acpi_status status;\
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\
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status = acpi_evaluate_integer(acpi_dev->handle, #method,\
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NULL, &val);\
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if (ACPI_SUCCESS(status))\
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return sprintf(buf, "%d\n", (int)val);\
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else\
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return -EINVAL;\
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}
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#define PCH_FIVR_STORE(name, method) \
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static ssize_t name##_store(struct device *dev,\
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struct device_attribute *attr,\
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const char *buf, size_t count)\
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{\
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struct acpi_device *acpi_dev = dev_get_drvdata(dev);\
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acpi_status status;\
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u32 val;\
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\
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if (kstrtouint(buf, 0, &val) < 0)\
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return -EINVAL;\
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\
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status = acpi_execute_simple_method(acpi_dev->handle, #method, val);\
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if (ACPI_SUCCESS(status))\
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return count;\
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\
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return -EINVAL;\
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}
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PCH_FIVR_SHOW(freq_mhz_low_clock, GFC0)
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PCH_FIVR_SHOW(freq_mhz_high_clock, GFC1)
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PCH_FIVR_STORE(freq_mhz_low_clock, RFC0)
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PCH_FIVR_STORE(freq_mhz_high_clock, RFC1)
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static DEVICE_ATTR_RW(freq_mhz_low_clock);
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static DEVICE_ATTR_RW(freq_mhz_high_clock);
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static struct attribute *fivr_attrs[] = {
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&dev_attr_freq_mhz_low_clock.attr,
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&dev_attr_freq_mhz_high_clock.attr,
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NULL
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};
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static const struct attribute_group pch_fivr_attribute_group = {
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.attrs = fivr_attrs,
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.name = "pch_fivr_switch_frequency"
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};
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static int pch_fivr_add(struct platform_device *pdev)
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{
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struct acpi_device *acpi_dev;
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unsigned long long ptype;
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acpi_status status;
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int result;
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acpi_dev = ACPI_COMPANION(&(pdev->dev));
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if (!acpi_dev)
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return -ENODEV;
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status = acpi_evaluate_integer(acpi_dev->handle, "PTYP", NULL, &ptype);
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if (ACPI_FAILURE(status) || ptype != 0x05)
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return -ENODEV;
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result = sysfs_create_group(&pdev->dev.kobj,
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&pch_fivr_attribute_group);
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if (result)
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return result;
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platform_set_drvdata(pdev, acpi_dev);
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return 0;
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}
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static int pch_fivr_remove(struct platform_device *pdev)
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{
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sysfs_remove_group(&pdev->dev.kobj, &pch_fivr_attribute_group);
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return 0;
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}
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static const struct acpi_device_id pch_fivr_device_ids[] = {
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{"INTC1045", 0},
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{"INTC1049", 0},
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{"", 0},
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};
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MODULE_DEVICE_TABLE(acpi, pch_fivr_device_ids);
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static struct platform_driver pch_fivr_driver = {
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.probe = pch_fivr_add,
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.remove = pch_fivr_remove,
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.driver = {
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.name = "dptf_pch_fivr",
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.acpi_match_table = pch_fivr_device_ids,
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},
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};
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module_platform_driver(pch_fivr_driver);
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MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("ACPI DPTF PCH FIVR driver");
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