297 lines
7.1 KiB
C
297 lines
7.1 KiB
C
/*
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* ACPI INT3403 thermal driver
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* Copyright (c) 2013, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/acpi.h>
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#include <linux/thermal.h>
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#define INT3403_TYPE_SENSOR 0x03
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#define INT3403_PERF_CHANGED_EVENT 0x80
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#define INT3403_THERMAL_EVENT 0x90
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#define DECI_KELVIN_TO_MILLI_CELSIUS(t, off) (((t) - (off)) * 100)
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#define KELVIN_OFFSET 2732
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#define MILLI_CELSIUS_TO_DECI_KELVIN(t, off) (((t) / 100) + (off))
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#define ACPI_INT3403_CLASS "int3403"
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#define ACPI_INT3403_FILE_STATE "state"
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struct int3403_sensor {
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struct thermal_zone_device *tzone;
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unsigned long *thresholds;
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unsigned long crit_temp;
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int crit_trip_id;
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unsigned long psv_temp;
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int psv_trip_id;
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};
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static int sys_get_curr_temp(struct thermal_zone_device *tzone,
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unsigned long *temp)
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{
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struct acpi_device *device = tzone->devdata;
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unsigned long long tmp;
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acpi_status status;
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status = acpi_evaluate_integer(device->handle, "_TMP", NULL, &tmp);
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if (ACPI_FAILURE(status))
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return -EIO;
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*temp = DECI_KELVIN_TO_MILLI_CELSIUS(tmp, KELVIN_OFFSET);
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return 0;
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}
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static int sys_get_trip_hyst(struct thermal_zone_device *tzone,
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int trip, unsigned long *temp)
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{
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struct acpi_device *device = tzone->devdata;
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unsigned long long hyst;
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acpi_status status;
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status = acpi_evaluate_integer(device->handle, "GTSH", NULL, &hyst);
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if (ACPI_FAILURE(status))
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return -EIO;
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/*
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* Thermal hysteresis represents a temperature difference.
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* Kelvin and Celsius have same degree size. So the
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* conversion here between tenths of degree Kelvin unit
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* and Milli-Celsius unit is just to multiply 100.
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*/
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*temp = hyst * 100;
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return 0;
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}
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static int sys_get_trip_temp(struct thermal_zone_device *tzone,
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int trip, unsigned long *temp)
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{
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struct acpi_device *device = tzone->devdata;
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struct int3403_sensor *obj = acpi_driver_data(device);
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if (trip == obj->crit_trip_id)
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*temp = obj->crit_temp;
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else if (trip == obj->psv_trip_id)
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*temp = obj->psv_temp;
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else {
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/*
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* get_trip_temp is a mandatory callback but
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* PATx method doesn't return any value, so return
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* cached value, which was last set from user space.
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*/
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*temp = obj->thresholds[trip];
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}
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return 0;
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}
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static int sys_get_trip_type(struct thermal_zone_device *thermal,
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int trip, enum thermal_trip_type *type)
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{
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struct acpi_device *device = thermal->devdata;
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struct int3403_sensor *obj = acpi_driver_data(device);
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/* Mandatory callback, may not mean much here */
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if (trip == obj->crit_trip_id)
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*type = THERMAL_TRIP_CRITICAL;
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else
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*type = THERMAL_TRIP_PASSIVE;
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return 0;
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}
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int sys_set_trip_temp(struct thermal_zone_device *tzone, int trip,
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unsigned long temp)
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{
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struct acpi_device *device = tzone->devdata;
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acpi_status status;
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char name[10];
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int ret = 0;
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struct int3403_sensor *obj = acpi_driver_data(device);
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snprintf(name, sizeof(name), "PAT%d", trip);
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if (acpi_has_method(device->handle, name)) {
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status = acpi_execute_simple_method(device->handle, name,
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MILLI_CELSIUS_TO_DECI_KELVIN(temp,
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KELVIN_OFFSET));
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if (ACPI_FAILURE(status))
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ret = -EIO;
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else
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obj->thresholds[trip] = temp;
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} else {
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ret = -EIO;
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dev_err(&device->dev, "sys_set_trip_temp: method not found\n");
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}
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return ret;
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}
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static struct thermal_zone_device_ops tzone_ops = {
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.get_temp = sys_get_curr_temp,
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.get_trip_temp = sys_get_trip_temp,
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.get_trip_type = sys_get_trip_type,
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.set_trip_temp = sys_set_trip_temp,
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.get_trip_hyst = sys_get_trip_hyst,
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};
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static void acpi_thermal_notify(struct acpi_device *device, u32 event)
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{
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struct int3403_sensor *obj;
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if (!device)
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return;
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obj = acpi_driver_data(device);
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if (!obj)
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return;
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switch (event) {
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case INT3403_PERF_CHANGED_EVENT:
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break;
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case INT3403_THERMAL_EVENT:
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thermal_zone_device_update(obj->tzone);
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break;
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default:
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dev_err(&device->dev, "Unsupported event [0x%x]\n", event);
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break;
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}
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}
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static int sys_get_trip_crt(struct acpi_device *device, unsigned long *temp)
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{
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unsigned long long crt;
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acpi_status status;
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status = acpi_evaluate_integer(device->handle, "_CRT", NULL, &crt);
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if (ACPI_FAILURE(status))
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return -EIO;
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*temp = DECI_KELVIN_TO_MILLI_CELSIUS(crt, KELVIN_OFFSET);
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return 0;
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}
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static int sys_get_trip_psv(struct acpi_device *device, unsigned long *temp)
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{
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unsigned long long psv;
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acpi_status status;
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status = acpi_evaluate_integer(device->handle, "_PSV", NULL, &psv);
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if (ACPI_FAILURE(status))
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return -EIO;
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*temp = DECI_KELVIN_TO_MILLI_CELSIUS(psv, KELVIN_OFFSET);
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return 0;
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}
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static int acpi_int3403_add(struct acpi_device *device)
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{
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int result = 0;
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unsigned long long ptyp;
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acpi_status status;
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struct int3403_sensor *obj;
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unsigned long long trip_cnt;
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int trip_mask = 0;
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if (!device)
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return -EINVAL;
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status = acpi_evaluate_integer(device->handle, "PTYP", NULL, &ptyp);
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if (ACPI_FAILURE(status))
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return -EINVAL;
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if (ptyp != INT3403_TYPE_SENSOR)
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return -EINVAL;
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obj = devm_kzalloc(&device->dev, sizeof(*obj), GFP_KERNEL);
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if (!obj)
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return -ENOMEM;
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device->driver_data = obj;
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status = acpi_evaluate_integer(device->handle, "PATC", NULL,
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&trip_cnt);
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if (ACPI_FAILURE(status))
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trip_cnt = 0;
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if (trip_cnt) {
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/* We have to cache, thresholds can't be readback */
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obj->thresholds = devm_kzalloc(&device->dev,
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sizeof(*obj->thresholds) * trip_cnt,
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GFP_KERNEL);
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if (!obj->thresholds)
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return -ENOMEM;
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trip_mask = BIT(trip_cnt) - 1;
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}
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obj->psv_trip_id = -1;
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if (!sys_get_trip_psv(device, &obj->psv_temp))
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obj->psv_trip_id = trip_cnt++;
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obj->crit_trip_id = -1;
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if (!sys_get_trip_crt(device, &obj->crit_temp))
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obj->crit_trip_id = trip_cnt++;
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obj->tzone = thermal_zone_device_register(acpi_device_bid(device),
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trip_cnt, trip_mask, device, &tzone_ops,
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NULL, 0, 0);
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if (IS_ERR(obj->tzone)) {
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result = PTR_ERR(obj->tzone);
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return result;
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}
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strcpy(acpi_device_name(device), "INT3403");
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strcpy(acpi_device_class(device), ACPI_INT3403_CLASS);
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return 0;
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}
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static int acpi_int3403_remove(struct acpi_device *device)
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{
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struct int3403_sensor *obj;
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obj = acpi_driver_data(device);
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thermal_zone_device_unregister(obj->tzone);
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return 0;
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}
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ACPI_MODULE_NAME("int3403");
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static const struct acpi_device_id int3403_device_ids[] = {
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{"INT3403", 0},
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{"", 0},
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};
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MODULE_DEVICE_TABLE(acpi, int3403_device_ids);
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static struct acpi_driver acpi_int3403_driver = {
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.name = "INT3403",
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.class = ACPI_INT3403_CLASS,
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.ids = int3403_device_ids,
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.ops = {
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.add = acpi_int3403_add,
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.remove = acpi_int3403_remove,
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.notify = acpi_thermal_notify,
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},
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};
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module_acpi_driver(acpi_int3403_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 INT3403 thermal driver");
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