diff options
| -rw-r--r-- | Documentation/ABI/testing/sysfs-platform-dptf | 16 | ||||
| -rw-r--r-- | drivers/acpi/dptf/Kconfig | 14 | ||||
| -rw-r--r-- | drivers/acpi/dptf/Makefile | 1 | ||||
| -rw-r--r-- | drivers/acpi/dptf/dptf_pch_fivr.c | 126 | ||||
| -rw-r--r-- | drivers/acpi/dptf/int340x_thermal.c | 1 |
5 files changed, 158 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-platform-dptf b/Documentation/ABI/testing/sysfs-platform-dptf index eeed81ca6949..2cbc660d163b 100644 --- a/Documentation/ABI/testing/sysfs-platform-dptf +++ b/Documentation/ABI/testing/sysfs-platform-dptf @@ -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. diff --git a/drivers/acpi/dptf/Kconfig b/drivers/acpi/dptf/Kconfig index 90a2fd979282..51f06f36cafa 100644 --- a/drivers/acpi/dptf/Kconfig +++ b/drivers/acpi/dptf/Kconfig @@ -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. diff --git a/drivers/acpi/dptf/Makefile b/drivers/acpi/dptf/Makefile index 1a9b0a2b25bf..297340682f66 100644 --- a/drivers/acpi/dptf/Makefile +++ b/drivers/acpi/dptf/Makefile @@ -1,3 +1,4 @@ # 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 diff --git a/drivers/acpi/dptf/dptf_pch_fivr.c b/drivers/acpi/dptf/dptf_pch_fivr.c new file mode 100644 index 000000000000..4ab288827747 --- /dev/null +++ b/drivers/acpi/dptf/dptf_pch_fivr.c @@ -0,0 +1,126 @@ +// 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"); diff --git a/drivers/acpi/dptf/int340x_thermal.c b/drivers/acpi/dptf/int340x_thermal.c index bc71a6a60334..8d420c7e7178 100644 --- a/drivers/acpi/dptf/int340x_thermal.c +++ b/drivers/acpi/dptf/int340x_thermal.c @@ -27,6 +27,7 @@ static const struct acpi_device_id int340x_thermal_device_ids[] = { {"INTC1040"}, {"INTC1043"}, {"INTC1044"}, + {"INTC1045"}, {"INTC1047"}, {""}, }; |