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17e8351a77
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>
126 lines
3.2 KiB
C
126 lines
3.2 KiB
C
/*
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* Kirkwood thermal sensor driver
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*
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* Copyright (C) 2012 Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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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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*/
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/of.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/thermal.h>
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#define KIRKWOOD_THERMAL_VALID_OFFSET 9
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#define KIRKWOOD_THERMAL_VALID_MASK 0x1
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#define KIRKWOOD_THERMAL_TEMP_OFFSET 10
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#define KIRKWOOD_THERMAL_TEMP_MASK 0x1FF
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/* Kirkwood Thermal Sensor Dev Structure */
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struct kirkwood_thermal_priv {
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void __iomem *sensor;
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};
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static int kirkwood_get_temp(struct thermal_zone_device *thermal,
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int *temp)
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{
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unsigned long reg;
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struct kirkwood_thermal_priv *priv = thermal->devdata;
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reg = readl_relaxed(priv->sensor);
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/* Valid check */
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if (!((reg >> KIRKWOOD_THERMAL_VALID_OFFSET) &
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KIRKWOOD_THERMAL_VALID_MASK)) {
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dev_err(&thermal->device,
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"Temperature sensor reading not valid\n");
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return -EIO;
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}
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/*
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* Calculate temperature. According to Marvell internal
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* documentation the formula for this is:
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* Celsius = (322-reg)/1.3625
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*/
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reg = (reg >> KIRKWOOD_THERMAL_TEMP_OFFSET) &
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KIRKWOOD_THERMAL_TEMP_MASK;
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*temp = ((3220000000UL - (10000000UL * reg)) / 13625);
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return 0;
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}
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static struct thermal_zone_device_ops ops = {
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.get_temp = kirkwood_get_temp,
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};
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static const struct of_device_id kirkwood_thermal_id_table[] = {
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{ .compatible = "marvell,kirkwood-thermal" },
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{}
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};
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static int kirkwood_thermal_probe(struct platform_device *pdev)
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{
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struct thermal_zone_device *thermal = NULL;
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struct kirkwood_thermal_priv *priv;
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struct resource *res;
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priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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priv->sensor = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(priv->sensor))
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return PTR_ERR(priv->sensor);
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thermal = thermal_zone_device_register("kirkwood_thermal", 0, 0,
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priv, &ops, NULL, 0, 0);
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if (IS_ERR(thermal)) {
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dev_err(&pdev->dev,
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"Failed to register thermal zone device\n");
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return PTR_ERR(thermal);
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}
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platform_set_drvdata(pdev, thermal);
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return 0;
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}
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static int kirkwood_thermal_exit(struct platform_device *pdev)
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{
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struct thermal_zone_device *kirkwood_thermal =
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platform_get_drvdata(pdev);
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thermal_zone_device_unregister(kirkwood_thermal);
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return 0;
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}
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MODULE_DEVICE_TABLE(of, kirkwood_thermal_id_table);
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static struct platform_driver kirkwood_thermal_driver = {
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.probe = kirkwood_thermal_probe,
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.remove = kirkwood_thermal_exit,
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.driver = {
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.name = "kirkwood_thermal",
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.of_match_table = kirkwood_thermal_id_table,
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},
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};
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module_platform_driver(kirkwood_thermal_driver);
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MODULE_AUTHOR("Nobuhiro Iwamatsu <iwamatsu@nigauri.org>");
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MODULE_DESCRIPTION("kirkwood thermal driver");
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MODULE_LICENSE("GPL");
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