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![Sascha Hauer](/assets/img/avatar_default.png)
The thermal code uses int, long and unsigned long for temperatures in different places. Using an unsigned type limits the thermal framework to positive temperatures without need. Also several drivers currently will report temperatures near UINT_MAX for temperatures below 0°C. This will probably immediately shut the machine down due to overtemperature if started below 0°C. 'long' is 64bit on several architectures. This is not needed since INT_MAX °mC is above the melting point of all known materials. Consistently use a plain 'int' for temperatures throughout the thermal code and the drivers. This only changes the places in the drivers where the temperature is passed around as pointer, when drivers internally use another type this is not changed. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Acked-by: Geert Uytterhoeven <geert+renesas@glider.be> Reviewed-by: Jean Delvare <jdelvare@suse.de> Reviewed-by: Lukasz Majewski <l.majewski@samsung.com> Reviewed-by: Darren Hart <dvhart@linux.intel.com> Reviewed-by: Heiko Stuebner <heiko@sntech.de> Reviewed-by: Peter Feuerer <peter@piie.net> Cc: Punit Agrawal <punit.agrawal@arm.com> Cc: Zhang Rui <rui.zhang@intel.com> Cc: Eduardo Valentin <edubezval@gmail.com> Cc: linux-pm@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: Jean Delvare <jdelvare@suse.de> Cc: Peter Feuerer <peter@piie.net> Cc: Heiko Stuebner <heiko@sntech.de> Cc: Lukasz Majewski <l.majewski@samsung.com> Cc: Stephen Warren <swarren@wwwdotorg.org> Cc: Thierry Reding <thierry.reding@gmail.com> Cc: linux-acpi@vger.kernel.org Cc: platform-driver-x86@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-omap@vger.kernel.org Cc: linux-samsung-soc@vger.kernel.org Cc: Guenter Roeck <linux@roeck-us.net> Cc: Rafael J. Wysocki <rjw@rjwysocki.net> Cc: Maxime Ripard <maxime.ripard@free-electrons.com> Cc: Darren Hart <dvhart@infradead.org> Cc: lm-sensors@lm-sensors.org Signed-off-by: Zhang Rui <rui.zhang@intel.com>
532 lines
14 KiB
C
532 lines
14 KiB
C
/*
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* db8500_thermal.c - DB8500 Thermal Management Implementation
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*
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* Copyright (C) 2012 ST-Ericsson
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* Copyright (C) 2012 Linaro Ltd.
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*
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* Author: Hongbo Zhang <hongbo.zhang@linaro.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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/cpu_cooling.h>
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#include <linux/interrupt.h>
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#include <linux/mfd/dbx500-prcmu.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_data/db8500_thermal.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/thermal.h>
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#define PRCMU_DEFAULT_MEASURE_TIME 0xFFF
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#define PRCMU_DEFAULT_LOW_TEMP 0
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struct db8500_thermal_zone {
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struct thermal_zone_device *therm_dev;
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struct mutex th_lock;
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struct work_struct therm_work;
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struct db8500_thsens_platform_data *trip_tab;
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enum thermal_device_mode mode;
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enum thermal_trend trend;
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unsigned long cur_temp_pseudo;
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unsigned int cur_index;
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};
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/* Local function to check if thermal zone matches cooling devices */
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static int db8500_thermal_match_cdev(struct thermal_cooling_device *cdev,
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struct db8500_trip_point *trip_point)
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{
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int i;
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if (!strlen(cdev->type))
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return -EINVAL;
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for (i = 0; i < COOLING_DEV_MAX; i++) {
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if (!strcmp(trip_point->cdev_name[i], cdev->type))
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return 0;
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}
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return -ENODEV;
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}
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/* Callback to bind cooling device to thermal zone */
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static int db8500_cdev_bind(struct thermal_zone_device *thermal,
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struct thermal_cooling_device *cdev)
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{
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struct db8500_thermal_zone *pzone = thermal->devdata;
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struct db8500_thsens_platform_data *ptrips = pzone->trip_tab;
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unsigned long max_state, upper, lower;
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int i, ret = -EINVAL;
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cdev->ops->get_max_state(cdev, &max_state);
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for (i = 0; i < ptrips->num_trips; i++) {
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if (db8500_thermal_match_cdev(cdev, &ptrips->trip_points[i]))
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continue;
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upper = lower = i > max_state ? max_state : i;
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ret = thermal_zone_bind_cooling_device(thermal, i, cdev,
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upper, lower, THERMAL_WEIGHT_DEFAULT);
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dev_info(&cdev->device, "%s bind to %d: %d-%s\n", cdev->type,
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i, ret, ret ? "fail" : "succeed");
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}
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return ret;
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}
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/* Callback to unbind cooling device from thermal zone */
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static int db8500_cdev_unbind(struct thermal_zone_device *thermal,
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struct thermal_cooling_device *cdev)
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{
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struct db8500_thermal_zone *pzone = thermal->devdata;
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struct db8500_thsens_platform_data *ptrips = pzone->trip_tab;
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int i, ret = -EINVAL;
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for (i = 0; i < ptrips->num_trips; i++) {
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if (db8500_thermal_match_cdev(cdev, &ptrips->trip_points[i]))
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continue;
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ret = thermal_zone_unbind_cooling_device(thermal, i, cdev);
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dev_info(&cdev->device, "%s unbind from %d: %s\n", cdev->type,
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i, ret ? "fail" : "succeed");
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}
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return ret;
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}
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/* Callback to get current temperature */
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static int db8500_sys_get_temp(struct thermal_zone_device *thermal, int *temp)
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{
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struct db8500_thermal_zone *pzone = thermal->devdata;
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/*
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* TODO: There is no PRCMU interface to get temperature data currently,
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* so a pseudo temperature is returned , it works for thermal framework
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* and this will be fixed when the PRCMU interface is available.
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*/
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*temp = pzone->cur_temp_pseudo;
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return 0;
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}
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/* Callback to get temperature changing trend */
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static int db8500_sys_get_trend(struct thermal_zone_device *thermal,
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int trip, enum thermal_trend *trend)
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{
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struct db8500_thermal_zone *pzone = thermal->devdata;
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*trend = pzone->trend;
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return 0;
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}
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/* Callback to get thermal zone mode */
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static int db8500_sys_get_mode(struct thermal_zone_device *thermal,
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enum thermal_device_mode *mode)
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{
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struct db8500_thermal_zone *pzone = thermal->devdata;
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mutex_lock(&pzone->th_lock);
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*mode = pzone->mode;
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mutex_unlock(&pzone->th_lock);
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return 0;
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}
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/* Callback to set thermal zone mode */
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static int db8500_sys_set_mode(struct thermal_zone_device *thermal,
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enum thermal_device_mode mode)
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{
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struct db8500_thermal_zone *pzone = thermal->devdata;
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mutex_lock(&pzone->th_lock);
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pzone->mode = mode;
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if (mode == THERMAL_DEVICE_ENABLED)
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schedule_work(&pzone->therm_work);
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mutex_unlock(&pzone->th_lock);
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return 0;
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}
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/* Callback to get trip point type */
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static int db8500_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 db8500_thermal_zone *pzone = thermal->devdata;
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struct db8500_thsens_platform_data *ptrips = pzone->trip_tab;
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if (trip >= ptrips->num_trips)
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return -EINVAL;
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*type = ptrips->trip_points[trip].type;
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return 0;
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}
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/* Callback to get trip point temperature */
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static int db8500_sys_get_trip_temp(struct thermal_zone_device *thermal,
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int trip, int *temp)
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{
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struct db8500_thermal_zone *pzone = thermal->devdata;
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struct db8500_thsens_platform_data *ptrips = pzone->trip_tab;
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if (trip >= ptrips->num_trips)
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return -EINVAL;
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*temp = ptrips->trip_points[trip].temp;
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return 0;
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}
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/* Callback to get critical trip point temperature */
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static int db8500_sys_get_crit_temp(struct thermal_zone_device *thermal,
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int *temp)
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{
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struct db8500_thermal_zone *pzone = thermal->devdata;
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struct db8500_thsens_platform_data *ptrips = pzone->trip_tab;
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int i;
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for (i = ptrips->num_trips - 1; i > 0; i--) {
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if (ptrips->trip_points[i].type == THERMAL_TRIP_CRITICAL) {
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*temp = ptrips->trip_points[i].temp;
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return 0;
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}
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}
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return -EINVAL;
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}
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static struct thermal_zone_device_ops thdev_ops = {
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.bind = db8500_cdev_bind,
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.unbind = db8500_cdev_unbind,
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.get_temp = db8500_sys_get_temp,
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.get_trend = db8500_sys_get_trend,
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.get_mode = db8500_sys_get_mode,
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.set_mode = db8500_sys_set_mode,
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.get_trip_type = db8500_sys_get_trip_type,
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.get_trip_temp = db8500_sys_get_trip_temp,
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.get_crit_temp = db8500_sys_get_crit_temp,
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};
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static void db8500_thermal_update_config(struct db8500_thermal_zone *pzone,
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unsigned int idx, enum thermal_trend trend,
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unsigned long next_low, unsigned long next_high)
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{
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prcmu_stop_temp_sense();
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pzone->cur_index = idx;
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pzone->cur_temp_pseudo = (next_low + next_high)/2;
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pzone->trend = trend;
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prcmu_config_hotmon((u8)(next_low/1000), (u8)(next_high/1000));
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prcmu_start_temp_sense(PRCMU_DEFAULT_MEASURE_TIME);
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}
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static irqreturn_t prcmu_low_irq_handler(int irq, void *irq_data)
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{
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struct db8500_thermal_zone *pzone = irq_data;
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struct db8500_thsens_platform_data *ptrips = pzone->trip_tab;
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unsigned int idx = pzone->cur_index;
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unsigned long next_low, next_high;
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if (unlikely(idx == 0))
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/* Meaningless for thermal management, ignoring it */
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return IRQ_HANDLED;
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if (idx == 1) {
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next_high = ptrips->trip_points[0].temp;
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next_low = PRCMU_DEFAULT_LOW_TEMP;
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} else {
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next_high = ptrips->trip_points[idx-1].temp;
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next_low = ptrips->trip_points[idx-2].temp;
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}
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idx -= 1;
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db8500_thermal_update_config(pzone, idx, THERMAL_TREND_DROPPING,
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next_low, next_high);
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dev_dbg(&pzone->therm_dev->device,
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"PRCMU set max %ld, min %ld\n", next_high, next_low);
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schedule_work(&pzone->therm_work);
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return IRQ_HANDLED;
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}
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static irqreturn_t prcmu_high_irq_handler(int irq, void *irq_data)
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{
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struct db8500_thermal_zone *pzone = irq_data;
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struct db8500_thsens_platform_data *ptrips = pzone->trip_tab;
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unsigned int idx = pzone->cur_index;
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unsigned long next_low, next_high;
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if (idx < ptrips->num_trips - 1) {
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next_high = ptrips->trip_points[idx+1].temp;
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next_low = ptrips->trip_points[idx].temp;
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idx += 1;
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db8500_thermal_update_config(pzone, idx, THERMAL_TREND_RAISING,
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next_low, next_high);
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dev_dbg(&pzone->therm_dev->device,
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"PRCMU set max %ld, min %ld\n", next_high, next_low);
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} else if (idx == ptrips->num_trips - 1)
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pzone->cur_temp_pseudo = ptrips->trip_points[idx].temp + 1;
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schedule_work(&pzone->therm_work);
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return IRQ_HANDLED;
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}
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static void db8500_thermal_work(struct work_struct *work)
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{
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enum thermal_device_mode cur_mode;
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struct db8500_thermal_zone *pzone;
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pzone = container_of(work, struct db8500_thermal_zone, therm_work);
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mutex_lock(&pzone->th_lock);
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cur_mode = pzone->mode;
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mutex_unlock(&pzone->th_lock);
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if (cur_mode == THERMAL_DEVICE_DISABLED)
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return;
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thermal_zone_device_update(pzone->therm_dev);
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dev_dbg(&pzone->therm_dev->device, "thermal work finished.\n");
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}
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#ifdef CONFIG_OF
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static struct db8500_thsens_platform_data*
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db8500_thermal_parse_dt(struct platform_device *pdev)
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{
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struct db8500_thsens_platform_data *ptrips;
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struct device_node *np = pdev->dev.of_node;
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char prop_name[32];
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const char *tmp_str;
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u32 tmp_data;
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int i, j;
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ptrips = devm_kzalloc(&pdev->dev, sizeof(*ptrips), GFP_KERNEL);
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if (!ptrips)
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return NULL;
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if (of_property_read_u32(np, "num-trips", &tmp_data))
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goto err_parse_dt;
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if (tmp_data > THERMAL_MAX_TRIPS)
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goto err_parse_dt;
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ptrips->num_trips = tmp_data;
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for (i = 0; i < ptrips->num_trips; i++) {
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sprintf(prop_name, "trip%d-temp", i);
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if (of_property_read_u32(np, prop_name, &tmp_data))
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goto err_parse_dt;
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ptrips->trip_points[i].temp = tmp_data;
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sprintf(prop_name, "trip%d-type", i);
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if (of_property_read_string(np, prop_name, &tmp_str))
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goto err_parse_dt;
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if (!strcmp(tmp_str, "active"))
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ptrips->trip_points[i].type = THERMAL_TRIP_ACTIVE;
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else if (!strcmp(tmp_str, "passive"))
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ptrips->trip_points[i].type = THERMAL_TRIP_PASSIVE;
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else if (!strcmp(tmp_str, "hot"))
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ptrips->trip_points[i].type = THERMAL_TRIP_HOT;
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else if (!strcmp(tmp_str, "critical"))
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ptrips->trip_points[i].type = THERMAL_TRIP_CRITICAL;
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else
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goto err_parse_dt;
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sprintf(prop_name, "trip%d-cdev-num", i);
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if (of_property_read_u32(np, prop_name, &tmp_data))
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goto err_parse_dt;
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if (tmp_data > COOLING_DEV_MAX)
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goto err_parse_dt;
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for (j = 0; j < tmp_data; j++) {
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sprintf(prop_name, "trip%d-cdev-name%d", i, j);
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if (of_property_read_string(np, prop_name, &tmp_str))
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goto err_parse_dt;
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if (strlen(tmp_str) >= THERMAL_NAME_LENGTH)
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goto err_parse_dt;
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strcpy(ptrips->trip_points[i].cdev_name[j], tmp_str);
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}
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}
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return ptrips;
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err_parse_dt:
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dev_err(&pdev->dev, "Parsing device tree data error.\n");
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return NULL;
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}
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#else
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static inline struct db8500_thsens_platform_data*
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db8500_thermal_parse_dt(struct platform_device *pdev)
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{
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return NULL;
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}
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#endif
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static int db8500_thermal_probe(struct platform_device *pdev)
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{
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struct db8500_thermal_zone *pzone = NULL;
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struct db8500_thsens_platform_data *ptrips = NULL;
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struct device_node *np = pdev->dev.of_node;
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int low_irq, high_irq, ret = 0;
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unsigned long dft_low, dft_high;
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if (np)
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ptrips = db8500_thermal_parse_dt(pdev);
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else
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ptrips = dev_get_platdata(&pdev->dev);
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if (!ptrips)
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return -EINVAL;
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pzone = devm_kzalloc(&pdev->dev, sizeof(*pzone), GFP_KERNEL);
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if (!pzone)
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return -ENOMEM;
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mutex_init(&pzone->th_lock);
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mutex_lock(&pzone->th_lock);
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pzone->mode = THERMAL_DEVICE_DISABLED;
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pzone->trip_tab = ptrips;
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INIT_WORK(&pzone->therm_work, db8500_thermal_work);
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low_irq = platform_get_irq_byname(pdev, "IRQ_HOTMON_LOW");
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if (low_irq < 0) {
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dev_err(&pdev->dev, "Get IRQ_HOTMON_LOW failed.\n");
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ret = low_irq;
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goto out_unlock;
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}
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ret = devm_request_threaded_irq(&pdev->dev, low_irq, NULL,
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prcmu_low_irq_handler, IRQF_NO_SUSPEND | IRQF_ONESHOT,
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"dbx500_temp_low", pzone);
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if (ret < 0) {
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dev_err(&pdev->dev, "Failed to allocate temp low irq.\n");
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goto out_unlock;
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}
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high_irq = platform_get_irq_byname(pdev, "IRQ_HOTMON_HIGH");
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if (high_irq < 0) {
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dev_err(&pdev->dev, "Get IRQ_HOTMON_HIGH failed.\n");
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ret = high_irq;
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goto out_unlock;
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}
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ret = devm_request_threaded_irq(&pdev->dev, high_irq, NULL,
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prcmu_high_irq_handler, IRQF_NO_SUSPEND | IRQF_ONESHOT,
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"dbx500_temp_high", pzone);
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if (ret < 0) {
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dev_err(&pdev->dev, "Failed to allocate temp high irq.\n");
|
|
goto out_unlock;
|
|
}
|
|
|
|
pzone->therm_dev = thermal_zone_device_register("db8500_thermal_zone",
|
|
ptrips->num_trips, 0, pzone, &thdev_ops, NULL, 0, 0);
|
|
|
|
if (IS_ERR(pzone->therm_dev)) {
|
|
dev_err(&pdev->dev, "Register thermal zone device failed.\n");
|
|
ret = PTR_ERR(pzone->therm_dev);
|
|
goto out_unlock;
|
|
}
|
|
dev_info(&pdev->dev, "Thermal zone device registered.\n");
|
|
|
|
dft_low = PRCMU_DEFAULT_LOW_TEMP;
|
|
dft_high = ptrips->trip_points[0].temp;
|
|
|
|
db8500_thermal_update_config(pzone, 0, THERMAL_TREND_STABLE,
|
|
dft_low, dft_high);
|
|
|
|
platform_set_drvdata(pdev, pzone);
|
|
pzone->mode = THERMAL_DEVICE_ENABLED;
|
|
|
|
out_unlock:
|
|
mutex_unlock(&pzone->th_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int db8500_thermal_remove(struct platform_device *pdev)
|
|
{
|
|
struct db8500_thermal_zone *pzone = platform_get_drvdata(pdev);
|
|
|
|
thermal_zone_device_unregister(pzone->therm_dev);
|
|
cancel_work_sync(&pzone->therm_work);
|
|
mutex_destroy(&pzone->th_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int db8500_thermal_suspend(struct platform_device *pdev,
|
|
pm_message_t state)
|
|
{
|
|
struct db8500_thermal_zone *pzone = platform_get_drvdata(pdev);
|
|
|
|
flush_work(&pzone->therm_work);
|
|
prcmu_stop_temp_sense();
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int db8500_thermal_resume(struct platform_device *pdev)
|
|
{
|
|
struct db8500_thermal_zone *pzone = platform_get_drvdata(pdev);
|
|
struct db8500_thsens_platform_data *ptrips = pzone->trip_tab;
|
|
unsigned long dft_low, dft_high;
|
|
|
|
dft_low = PRCMU_DEFAULT_LOW_TEMP;
|
|
dft_high = ptrips->trip_points[0].temp;
|
|
|
|
db8500_thermal_update_config(pzone, 0, THERMAL_TREND_STABLE,
|
|
dft_low, dft_high);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_OF
|
|
static const struct of_device_id db8500_thermal_match[] = {
|
|
{ .compatible = "stericsson,db8500-thermal" },
|
|
{},
|
|
};
|
|
#endif
|
|
|
|
static struct platform_driver db8500_thermal_driver = {
|
|
.driver = {
|
|
.name = "db8500-thermal",
|
|
.of_match_table = of_match_ptr(db8500_thermal_match),
|
|
},
|
|
.probe = db8500_thermal_probe,
|
|
.suspend = db8500_thermal_suspend,
|
|
.resume = db8500_thermal_resume,
|
|
.remove = db8500_thermal_remove,
|
|
};
|
|
|
|
module_platform_driver(db8500_thermal_driver);
|
|
|
|
MODULE_AUTHOR("Hongbo Zhang <hongbo.zhang@stericsson.com>");
|
|
MODULE_DESCRIPTION("DB8500 thermal driver");
|
|
MODULE_LICENSE("GPL");
|