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thermal: intel_pch_thermal: Add an ACPI passive trip
On the platforms which has an ACPI companion device associated with PCH thermal device, read passive trip temperature via ACPI _PSV control method. Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Signed-off-by: Zhang Rui <rui.zhang@intel.com>
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1 changed files with 51 additions and 0 deletions
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@ -20,6 +20,7 @@
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/pci.h>
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#include <linux/acpi.h>
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#include <linux/thermal.h>
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#include <linux/pm.h>
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@ -66,9 +67,53 @@ struct pch_thermal_device {
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unsigned long crt_temp;
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int hot_trip_id;
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unsigned long hot_temp;
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int psv_trip_id;
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unsigned long psv_temp;
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bool bios_enabled;
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};
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#ifdef CONFIG_ACPI
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/*
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* On some platforms, there is a companion ACPI device, which adds
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* passive trip temperature using _PSV method. There is no specific
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* passive temperature setting in MMIO interface of this PCI device.
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*/
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static void pch_wpt_add_acpi_psv_trip(struct pch_thermal_device *ptd,
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int *nr_trips)
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{
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struct acpi_device *adev;
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ptd->psv_trip_id = -1;
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adev = ACPI_COMPANION(&ptd->pdev->dev);
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if (adev) {
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unsigned long long r;
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acpi_status status;
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status = acpi_evaluate_integer(adev->handle, "_PSV", NULL,
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&r);
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if (ACPI_SUCCESS(status)) {
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unsigned long trip_temp;
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trip_temp = DECI_KELVIN_TO_MILLICELSIUS(r);
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if (trip_temp) {
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ptd->psv_temp = trip_temp;
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ptd->psv_trip_id = *nr_trips;
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++(*nr_trips);
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}
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}
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}
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}
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#else
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static void pch_wpt_add_acpi_psv_trip(struct pch_thermal_device *ptd,
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int *nr_trips)
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{
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ptd->psv_trip_id = -1;
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}
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#endif
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static int pch_wpt_init(struct pch_thermal_device *ptd, int *nr_trips)
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{
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u8 tsel;
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@ -119,6 +164,8 @@ static int pch_wpt_init(struct pch_thermal_device *ptd, int *nr_trips)
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++(*nr_trips);
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}
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pch_wpt_add_acpi_psv_trip(ptd, nr_trips);
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return 0;
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}
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@ -194,6 +241,8 @@ static int pch_get_trip_type(struct thermal_zone_device *tzd, int trip,
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*type = THERMAL_TRIP_CRITICAL;
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else if (ptd->hot_trip_id == trip)
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*type = THERMAL_TRIP_HOT;
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else if (ptd->psv_trip_id == trip)
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*type = THERMAL_TRIP_PASSIVE;
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else
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return -EINVAL;
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@ -208,6 +257,8 @@ static int pch_get_trip_temp(struct thermal_zone_device *tzd, int trip, int *tem
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*temp = ptd->crt_temp;
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else if (ptd->hot_trip_id == trip)
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*temp = ptd->hot_temp;
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else if (ptd->psv_trip_id == trip)
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*temp = ptd->psv_temp;
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else
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return -EINVAL;
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