Thermal: introduce INT3402 thermal driver
ACPI INT3402 device object could report temperature for the memory module. To expose such information to user space, a thermal zone device is registered for it so that the thermal sysfs interface can expose such information for userspace to use. Signed-off-by: Aaron Lu <aaron.lu@intel.com> Signed-off-by: Zhang Rui <rui.zhang@intel.com>
This commit is contained in:
Aaron Lu
Zhang Rui
parent
7b83fd9d91
commit
77e337c6e2
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@ -1 +1,2 @@
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obj-$(CONFIG_INT340X_THERMAL) += int3400_thermal.o
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obj-$(CONFIG_INT340X_THERMAL) += int3402_thermal.o
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@ -0,0 +1,242 @@
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/*
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* INT3402 thermal driver for memory temperature reporting
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*
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* Copyright (C) 2014, Intel Corporation
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* Authors: Aaron Lu <aaron.lu@intel.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/acpi.h>
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#include <linux/thermal.h>
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#define ACPI_ACTIVE_COOLING_MAX_NR 10
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struct active_trip {
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unsigned long temp;
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int id;
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bool valid;
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};
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struct int3402_thermal_data {
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unsigned long *aux_trips;
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int aux_trip_nr;
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unsigned long psv_temp;
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int psv_trip_id;
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unsigned long crt_temp;
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int crt_trip_id;
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unsigned long hot_temp;
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int hot_trip_id;
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struct active_trip act_trips[ACPI_ACTIVE_COOLING_MAX_NR];
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acpi_handle *handle;
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};
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static int int3402_thermal_get_zone_temp(struct thermal_zone_device *zone,
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unsigned long *temp)
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{
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struct int3402_thermal_data *d = zone->devdata;
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unsigned long long tmp;
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acpi_status status;
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status = acpi_evaluate_integer(d->handle, "_TMP", NULL, &tmp);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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/* _TMP returns the temperature in tenths of degrees Kelvin */
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*temp = DECI_KELVIN_TO_MILLICELSIUS(tmp);
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return 0;
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}
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static int int3402_thermal_get_trip_temp(struct thermal_zone_device *zone,
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int trip, unsigned long *temp)
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{
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struct int3402_thermal_data *d = zone->devdata;
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int i;
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if (trip < d->aux_trip_nr)
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*temp = d->aux_trips[trip];
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else if (trip == d->crt_trip_id)
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*temp = d->crt_temp;
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else if (trip == d->psv_trip_id)
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*temp = d->psv_temp;
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else if (trip == d->hot_trip_id)
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*temp = d->hot_temp;
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else {
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for (i = 0; i < ACPI_ACTIVE_COOLING_MAX_NR; i++) {
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if (d->act_trips[i].valid &&
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d->act_trips[i].id == trip) {
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*temp = d->act_trips[i].temp;
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break;
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}
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}
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if (i == ACPI_ACTIVE_COOLING_MAX_NR)
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return -EINVAL;
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}
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return 0;
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}
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static int int3402_thermal_get_trip_type(struct thermal_zone_device *zone,
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int trip, enum thermal_trip_type *type)
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{
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struct int3402_thermal_data *d = zone->devdata;
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int i;
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if (trip < d->aux_trip_nr)
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*type = THERMAL_TRIP_PASSIVE;
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else if (trip == d->crt_trip_id)
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*type = THERMAL_TRIP_CRITICAL;
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else if (trip == d->hot_trip_id)
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*type = THERMAL_TRIP_HOT;
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else if (trip == d->psv_trip_id)
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*type = THERMAL_TRIP_PASSIVE;
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else {
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for (i = 0; i < ACPI_ACTIVE_COOLING_MAX_NR; i++) {
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if (d->act_trips[i].valid &&
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d->act_trips[i].id == trip) {
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*type = THERMAL_TRIP_ACTIVE;
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break;
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}
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}
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if (i == ACPI_ACTIVE_COOLING_MAX_NR)
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return -EINVAL;
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}
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return 0;
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}
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static int int3402_thermal_set_trip_temp(struct thermal_zone_device *zone, int trip,
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unsigned long temp)
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{
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struct int3402_thermal_data *d = zone->devdata;
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acpi_status status;
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char name[10];
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snprintf(name, sizeof(name), "PAT%d", trip);
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status = acpi_execute_simple_method(d->handle, name,
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MILLICELSIUS_TO_DECI_KELVIN(temp));
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if (ACPI_FAILURE(status))
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return -EIO;
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d->aux_trips[trip] = temp;
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return 0;
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}
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static struct thermal_zone_device_ops int3402_thermal_zone_ops = {
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.get_temp = int3402_thermal_get_zone_temp,
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.get_trip_temp = int3402_thermal_get_trip_temp,
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.get_trip_type = int3402_thermal_get_trip_type,
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.set_trip_temp = int3402_thermal_set_trip_temp,
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};
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static struct thermal_zone_params int3402_thermal_params = {
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.governor_name = "user_space",
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.no_hwmon = true,
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};
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static int int3402_thermal_get_temp(acpi_handle handle, char *name,
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unsigned long *temp)
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{
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unsigned long long r;
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acpi_status status;
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status = acpi_evaluate_integer(handle, name, NULL, &r);
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if (ACPI_FAILURE(status))
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return -EIO;
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*temp = DECI_KELVIN_TO_MILLICELSIUS(r);
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return 0;
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}
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static int int3402_thermal_probe(struct platform_device *pdev)
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{
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struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);
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struct int3402_thermal_data *d;
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struct thermal_zone_device *zone;
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acpi_status status;
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unsigned long long trip_cnt;
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int trip_mask = 0, i;
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if (!acpi_has_method(adev->handle, "_TMP"))
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return -ENODEV;
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d = devm_kzalloc(&pdev->dev, sizeof(*d), GFP_KERNEL);
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if (!d)
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return -ENOMEM;
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status = acpi_evaluate_integer(adev->handle, "PATC", NULL, &trip_cnt);
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if (ACPI_FAILURE(status))
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trip_cnt = 0;
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else {
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d->aux_trips = devm_kzalloc(&pdev->dev,
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sizeof(*d->aux_trips) * trip_cnt, GFP_KERNEL);
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if (!d->aux_trips)
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return -ENOMEM;
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trip_mask = trip_cnt - 1;
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d->handle = adev->handle;
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d->aux_trip_nr = trip_cnt;
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}
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d->crt_trip_id = -1;
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if (!int3402_thermal_get_temp(adev->handle, "_CRT", &d->crt_temp))
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d->crt_trip_id = trip_cnt++;
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d->hot_trip_id = -1;
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if (!int3402_thermal_get_temp(adev->handle, "_HOT", &d->hot_temp))
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d->hot_trip_id = trip_cnt++;
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d->psv_trip_id = -1;
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if (!int3402_thermal_get_temp(adev->handle, "_PSV", &d->psv_temp))
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d->psv_trip_id = trip_cnt++;
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for (i = 0; i < ACPI_ACTIVE_COOLING_MAX_NR; i++) {
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char name[5] = { '_', 'A', 'C', '0' + i, '\0' };
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if (int3402_thermal_get_temp(adev->handle, name,
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&d->act_trips[i].temp))
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break;
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d->act_trips[i].id = trip_cnt++;
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d->act_trips[i].valid = true;
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}
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zone = thermal_zone_device_register(acpi_device_bid(adev), trip_cnt,
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trip_mask, d,
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&int3402_thermal_zone_ops,
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&int3402_thermal_params,
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0, 0);
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if (IS_ERR(zone))
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return PTR_ERR(zone);
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platform_set_drvdata(pdev, zone);
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return 0;
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}
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static int int3402_thermal_remove(struct platform_device *pdev)
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{
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struct thermal_zone_device *zone = platform_get_drvdata(pdev);
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thermal_zone_device_unregister(zone);
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return 0;
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}
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static const struct acpi_device_id int3402_thermal_match[] = {
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{"INT3402", 0},
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{}
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};
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MODULE_DEVICE_TABLE(acpi, int3402_thermal_match);
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static struct platform_driver int3402_thermal_driver = {
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.probe = int3402_thermal_probe,
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.remove = int3402_thermal_remove,
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.driver = {
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.name = "int3402 thermal",
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.owner = THIS_MODULE,
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.acpi_match_table = int3402_thermal_match,
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},
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};
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module_platform_driver(int3402_thermal_driver);
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MODULE_DESCRIPTION("INT3402 Thermal driver");
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MODULE_LICENSE("GPL");
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@ -46,6 +46,8 @@
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#define CELSIUS_TO_KELVIN(t) ((t)*10+2732)
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#define DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(t, off) (((t) - (off)) * 100)
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#define DECI_KELVIN_TO_MILLICELSIUS(t) DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(t, 2732)
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#define MILLICELSIUS_TO_DECI_KELVIN_WITH_OFFSET(t, off) (((t) / 100) + (off))
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#define MILLICELSIUS_TO_DECI_KELVIN(t) MILLICELSIUS_TO_DECI_KELVIN_WITH_OFFSET(t, 2732)
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/* Adding event notification support elements */
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#define THERMAL_GENL_FAMILY_NAME "thermal_event"
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